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1da177e4 LT |
1 | /* i2c-core.c - a device driver for the iic-bus interface */ |
2 | /* ------------------------------------------------------------------------- */ | |
3 | /* Copyright (C) 1995-99 Simon G. Vogl | |
4 | ||
5 | This program is free software; you can redistribute it and/or modify | |
6 | it under the terms of the GNU General Public License as published by | |
7 | the Free Software Foundation; either version 2 of the License, or | |
8 | (at your option) any later version. | |
9 | ||
10 | This program is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
ca1f8da9 | 13 | GNU General Public License for more details. */ |
1da177e4 LT |
14 | /* ------------------------------------------------------------------------- */ |
15 | ||
96de0e25 | 16 | /* With some changes from Kyösti Mälkki <kmalkki@cc.hut.fi>. |
1da177e4 | 17 | All SMBus-related things are written by Frodo Looijaard <frodol@dds.nl> |
421ef47b | 18 | SMBus 2.0 support by Mark Studebaker <mdsxyz123@yahoo.com> and |
7c81c60f | 19 | Jean Delvare <jdelvare@suse.de> |
0826374b | 20 | Mux support by Rodolfo Giometti <giometti@enneenne.com> and |
687b81d0 WS |
21 | Michael Lawnick <michael.lawnick.ext@nsn.com> |
22 | OF support is copyright (c) 2008 Jochen Friedrich <jochen@scram.de> | |
23 | (based on a previous patch from Jon Smirl <jonsmirl@gmail.com>) and | |
24 | (c) 2013 Wolfram Sang <wsa@the-dreams.de> | |
17f4a5c4 WS |
25 | I2C ACPI code Copyright (C) 2014 Intel Corp |
26 | Author: Lan Tianyu <tianyu.lan@intel.com> | |
4b1acc43 | 27 | I2C slave support (c) 2014 by Wolfram Sang <wsa@sang-engineering.com> |
687b81d0 | 28 | */ |
1da177e4 | 29 | |
44239a5a WS |
30 | #define pr_fmt(fmt) "i2c-core: " fmt |
31 | ||
b4e2f6ac | 32 | #include <dt-bindings/i2c/i2c.h> |
7c0f6ba6 | 33 | #include <linux/uaccess.h> |
53feedf8 WS |
34 | #include <linux/acpi.h> |
35 | #include <linux/clk/clk-conf.h> | |
36 | #include <linux/completion.h> | |
5f9296ba | 37 | #include <linux/delay.h> |
53feedf8 | 38 | #include <linux/err.h> |
1da177e4 | 39 | #include <linux/errno.h> |
5f9296ba | 40 | #include <linux/gpio.h> |
53feedf8 | 41 | #include <linux/hardirq.h> |
1da177e4 | 42 | #include <linux/i2c.h> |
1da177e4 | 43 | #include <linux/idr.h> |
53feedf8 WS |
44 | #include <linux/init.h> |
45 | #include <linux/irqflags.h> | |
46 | #include <linux/jump_label.h> | |
47 | #include <linux/kernel.h> | |
48 | #include <linux/module.h> | |
b3585e4f | 49 | #include <linux/mutex.h> |
959e85f7 | 50 | #include <linux/of_device.h> |
53feedf8 | 51 | #include <linux/of.h> |
687b81d0 | 52 | #include <linux/of_irq.h> |
f48c767c | 53 | #include <linux/pm_domain.h> |
53feedf8 | 54 | #include <linux/pm_runtime.h> |
3fffd128 | 55 | #include <linux/pm_wakeirq.h> |
e1dba01c | 56 | #include <linux/property.h> |
53feedf8 WS |
57 | #include <linux/rwsem.h> |
58 | #include <linux/slab.h> | |
1da177e4 | 59 | |
9c1600ed DB |
60 | #include "i2c-core.h" |
61 | ||
d9a83d62 DH |
62 | #define CREATE_TRACE_POINTS |
63 | #include <trace/events/i2c.h> | |
1da177e4 | 64 | |
da899f55 WS |
65 | #define I2C_ADDR_OFFSET_TEN_BIT 0xa000 |
66 | #define I2C_ADDR_OFFSET_SLAVE 0x1000 | |
67 | ||
4d5538f5 BT |
68 | #define I2C_ADDR_7BITS_MAX 0x77 |
69 | #define I2C_ADDR_7BITS_COUNT (I2C_ADDR_7BITS_MAX + 1) | |
70 | ||
6629dcff | 71 | /* core_lock protects i2c_adapter_idr, and guarantees |
35fc37f8 | 72 | that device detection, deletion of detected devices, and attach_adapter |
19baba4c | 73 | calls are serialized */ |
caada32a | 74 | static DEFINE_MUTEX(core_lock); |
1da177e4 LT |
75 | static DEFINE_IDR(i2c_adapter_idr); |
76 | ||
4f8cf824 | 77 | static struct device_type i2c_client_type; |
4735c98f | 78 | static int i2c_detect(struct i2c_adapter *adapter, struct i2c_driver *driver); |
f37dd80a | 79 | |
d9a83d62 | 80 | static struct static_key i2c_trace_msg = STATIC_KEY_INIT_FALSE; |
95026658 | 81 | static bool is_registered; |
d9a83d62 | 82 | |
8cf868af | 83 | int i2c_transfer_trace_reg(void) |
d9a83d62 DH |
84 | { |
85 | static_key_slow_inc(&i2c_trace_msg); | |
8cf868af | 86 | return 0; |
d9a83d62 DH |
87 | } |
88 | ||
89 | void i2c_transfer_trace_unreg(void) | |
90 | { | |
91 | static_key_slow_dec(&i2c_trace_msg); | |
92 | } | |
93 | ||
17f4a5c4 | 94 | #if defined(CONFIG_ACPI) |
aec809fc | 95 | struct i2c_acpi_handler_data { |
17f4a5c4 WS |
96 | struct acpi_connection_info info; |
97 | struct i2c_adapter *adapter; | |
98 | }; | |
99 | ||
100 | struct gsb_buffer { | |
101 | u8 status; | |
102 | u8 len; | |
103 | union { | |
104 | u16 wdata; | |
105 | u8 bdata; | |
106 | u8 data[0]; | |
107 | }; | |
108 | } __packed; | |
109 | ||
aec809fc | 110 | struct i2c_acpi_lookup { |
166c2ba3 MW |
111 | struct i2c_board_info *info; |
112 | acpi_handle adapter_handle; | |
113 | acpi_handle device_handle; | |
5853b22d JN |
114 | acpi_handle search_handle; |
115 | u32 speed; | |
116 | u32 min_speed; | |
166c2ba3 | 117 | }; |
17f4a5c4 | 118 | |
aec809fc | 119 | static int i2c_acpi_fill_info(struct acpi_resource *ares, void *data) |
166c2ba3 | 120 | { |
aec809fc | 121 | struct i2c_acpi_lookup *lookup = data; |
166c2ba3 MW |
122 | struct i2c_board_info *info = lookup->info; |
123 | struct acpi_resource_i2c_serialbus *sb; | |
166c2ba3 | 124 | acpi_status status; |
17f4a5c4 | 125 | |
166c2ba3 MW |
126 | if (info->addr || ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS) |
127 | return 1; | |
128 | ||
129 | sb = &ares->data.i2c_serial_bus; | |
130 | if (sb->type != ACPI_RESOURCE_SERIAL_TYPE_I2C) | |
131 | return 1; | |
132 | ||
166c2ba3 MW |
133 | status = acpi_get_handle(lookup->device_handle, |
134 | sb->resource_source.string_ptr, | |
525e6fab OP |
135 | &lookup->adapter_handle); |
136 | if (!ACPI_SUCCESS(status)) | |
137 | return 1; | |
138 | ||
139 | info->addr = sb->slave_address; | |
5853b22d | 140 | lookup->speed = sb->connection_speed; |
525e6fab OP |
141 | if (sb->access_mode == ACPI_I2C_10BIT_MODE) |
142 | info->flags |= I2C_CLIENT_TEN; | |
17f4a5c4 | 143 | |
17f4a5c4 WS |
144 | return 1; |
145 | } | |
146 | ||
5853b22d JN |
147 | static int i2c_acpi_do_lookup(struct acpi_device *adev, |
148 | struct i2c_acpi_lookup *lookup) | |
17f4a5c4 | 149 | { |
5853b22d | 150 | struct i2c_board_info *info = lookup->info; |
17f4a5c4 | 151 | struct list_head resource_list; |
17f4a5c4 WS |
152 | int ret; |
153 | ||
525e6fab OP |
154 | if (acpi_bus_get_status(adev) || !adev->status.present || |
155 | acpi_device_enumerated(adev)) | |
156 | return -EINVAL; | |
17f4a5c4 | 157 | |
525e6fab | 158 | memset(info, 0, sizeof(*info)); |
5853b22d | 159 | lookup->device_handle = acpi_device_handle(adev); |
166c2ba3 | 160 | |
525e6fab | 161 | /* Look up for I2cSerialBus resource */ |
17f4a5c4 WS |
162 | INIT_LIST_HEAD(&resource_list); |
163 | ret = acpi_dev_get_resources(adev, &resource_list, | |
5853b22d | 164 | i2c_acpi_fill_info, lookup); |
17f4a5c4 WS |
165 | acpi_dev_free_resource_list(&resource_list); |
166 | ||
525e6fab OP |
167 | if (ret < 0 || !info->addr) |
168 | return -EINVAL; | |
169 | ||
5853b22d JN |
170 | return 0; |
171 | } | |
172 | ||
173 | static int i2c_acpi_get_info(struct acpi_device *adev, | |
174 | struct i2c_board_info *info, | |
318ce278 | 175 | struct i2c_adapter *adapter, |
5853b22d JN |
176 | acpi_handle *adapter_handle) |
177 | { | |
178 | struct list_head resource_list; | |
179 | struct resource_entry *entry; | |
180 | struct i2c_acpi_lookup lookup; | |
181 | int ret; | |
182 | ||
183 | memset(&lookup, 0, sizeof(lookup)); | |
184 | lookup.info = info; | |
185 | ||
186 | ret = i2c_acpi_do_lookup(adev, &lookup); | |
187 | if (ret) | |
188 | return ret; | |
189 | ||
318ce278 MW |
190 | if (adapter) { |
191 | /* The adapter must match the one in I2cSerialBus() connector */ | |
192 | if (ACPI_HANDLE(&adapter->dev) != lookup.adapter_handle) | |
193 | return -ENODEV; | |
194 | } else { | |
195 | struct acpi_device *adapter_adev; | |
196 | ||
197 | /* The adapter must be present */ | |
198 | if (acpi_bus_get_device(lookup.adapter_handle, &adapter_adev)) | |
199 | return -ENODEV; | |
200 | if (acpi_bus_get_status(adapter_adev) || | |
201 | !adapter_adev->status.present) | |
202 | return -ENODEV; | |
203 | } | |
204 | ||
5853b22d | 205 | info->fwnode = acpi_fwnode_handle(adev); |
318ce278 MW |
206 | if (adapter_handle) |
207 | *adapter_handle = lookup.adapter_handle; | |
17f4a5c4 | 208 | |
166c2ba3 | 209 | /* Then fill IRQ number if any */ |
5853b22d | 210 | INIT_LIST_HEAD(&resource_list); |
166c2ba3 MW |
211 | ret = acpi_dev_get_resources(adev, &resource_list, NULL, NULL); |
212 | if (ret < 0) | |
525e6fab | 213 | return -EINVAL; |
166c2ba3 MW |
214 | |
215 | resource_list_for_each_entry(entry, &resource_list) { | |
216 | if (resource_type(entry->res) == IORESOURCE_IRQ) { | |
525e6fab | 217 | info->irq = entry->res->start; |
166c2ba3 MW |
218 | break; |
219 | } | |
220 | } | |
221 | ||
222 | acpi_dev_free_resource_list(&resource_list); | |
223 | ||
622b3077 DD |
224 | acpi_set_modalias(adev, dev_name(&adev->dev), info->type, |
225 | sizeof(info->type)); | |
525e6fab OP |
226 | |
227 | return 0; | |
228 | } | |
229 | ||
aec809fc | 230 | static void i2c_acpi_register_device(struct i2c_adapter *adapter, |
525e6fab OP |
231 | struct acpi_device *adev, |
232 | struct i2c_board_info *info) | |
233 | { | |
17f4a5c4 | 234 | adev->power.flags.ignore_parent = true; |
525e6fab OP |
235 | acpi_device_set_enumerated(adev); |
236 | ||
237 | if (!i2c_new_device(adapter, info)) { | |
17f4a5c4 WS |
238 | adev->power.flags.ignore_parent = false; |
239 | dev_err(&adapter->dev, | |
240 | "failed to add I2C device %s from ACPI\n", | |
241 | dev_name(&adev->dev)); | |
242 | } | |
525e6fab OP |
243 | } |
244 | ||
aec809fc | 245 | static acpi_status i2c_acpi_add_device(acpi_handle handle, u32 level, |
525e6fab OP |
246 | void *data, void **return_value) |
247 | { | |
248 | struct i2c_adapter *adapter = data; | |
249 | struct acpi_device *adev; | |
525e6fab OP |
250 | struct i2c_board_info info; |
251 | ||
252 | if (acpi_bus_get_device(handle, &adev)) | |
253 | return AE_OK; | |
254 | ||
318ce278 | 255 | if (i2c_acpi_get_info(adev, &info, adapter, NULL)) |
525e6fab OP |
256 | return AE_OK; |
257 | ||
aec809fc | 258 | i2c_acpi_register_device(adapter, adev, &info); |
17f4a5c4 WS |
259 | |
260 | return AE_OK; | |
261 | } | |
262 | ||
aec809fc | 263 | #define I2C_ACPI_MAX_SCAN_DEPTH 32 |
166c2ba3 | 264 | |
17f4a5c4 | 265 | /** |
aec809fc | 266 | * i2c_acpi_register_devices - enumerate I2C slave devices behind adapter |
17f4a5c4 WS |
267 | * @adap: pointer to adapter |
268 | * | |
269 | * Enumerate all I2C slave devices behind this adapter by walking the ACPI | |
270 | * namespace. When a device is found it will be added to the Linux device | |
271 | * model and bound to the corresponding ACPI handle. | |
272 | */ | |
aec809fc | 273 | static void i2c_acpi_register_devices(struct i2c_adapter *adap) |
17f4a5c4 | 274 | { |
17f4a5c4 WS |
275 | acpi_status status; |
276 | ||
8eb5c87a | 277 | if (!has_acpi_companion(&adap->dev)) |
17f4a5c4 WS |
278 | return; |
279 | ||
166c2ba3 | 280 | status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, |
aec809fc JN |
281 | I2C_ACPI_MAX_SCAN_DEPTH, |
282 | i2c_acpi_add_device, NULL, | |
17f4a5c4 WS |
283 | adap, NULL); |
284 | if (ACPI_FAILURE(status)) | |
285 | dev_warn(&adap->dev, "failed to enumerate I2C slaves\n"); | |
286 | } | |
287 | ||
5853b22d JN |
288 | static acpi_status i2c_acpi_lookup_speed(acpi_handle handle, u32 level, |
289 | void *data, void **return_value) | |
290 | { | |
291 | struct i2c_acpi_lookup *lookup = data; | |
292 | struct acpi_device *adev; | |
293 | ||
294 | if (acpi_bus_get_device(handle, &adev)) | |
295 | return AE_OK; | |
296 | ||
297 | if (i2c_acpi_do_lookup(adev, lookup)) | |
298 | return AE_OK; | |
299 | ||
300 | if (lookup->search_handle != lookup->adapter_handle) | |
301 | return AE_OK; | |
302 | ||
303 | if (lookup->speed <= lookup->min_speed) | |
304 | lookup->min_speed = lookup->speed; | |
305 | ||
306 | return AE_OK; | |
307 | } | |
308 | ||
309 | /** | |
310 | * i2c_acpi_find_bus_speed - find I2C bus speed from ACPI | |
311 | * @dev: The device owning the bus | |
312 | * | |
313 | * Find the I2C bus speed by walking the ACPI namespace for all I2C slaves | |
314 | * devices connected to this bus and use the speed of slowest device. | |
315 | * | |
316 | * Returns the speed in Hz or zero | |
317 | */ | |
318 | u32 i2c_acpi_find_bus_speed(struct device *dev) | |
319 | { | |
320 | struct i2c_acpi_lookup lookup; | |
321 | struct i2c_board_info dummy; | |
322 | acpi_status status; | |
323 | ||
324 | if (!has_acpi_companion(dev)) | |
325 | return 0; | |
326 | ||
327 | memset(&lookup, 0, sizeof(lookup)); | |
328 | lookup.search_handle = ACPI_HANDLE(dev); | |
329 | lookup.min_speed = UINT_MAX; | |
330 | lookup.info = &dummy; | |
331 | ||
332 | status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, | |
333 | I2C_ACPI_MAX_SCAN_DEPTH, | |
334 | i2c_acpi_lookup_speed, NULL, | |
335 | &lookup, NULL); | |
336 | ||
337 | if (ACPI_FAILURE(status)) { | |
338 | dev_warn(dev, "unable to find I2C bus speed from ACPI\n"); | |
339 | return 0; | |
340 | } | |
341 | ||
342 | return lookup.min_speed != UINT_MAX ? lookup.min_speed : 0; | |
343 | } | |
344 | EXPORT_SYMBOL_GPL(i2c_acpi_find_bus_speed); | |
345 | ||
aec809fc | 346 | static int i2c_acpi_match_adapter(struct device *dev, void *data) |
525e6fab OP |
347 | { |
348 | struct i2c_adapter *adapter = i2c_verify_adapter(dev); | |
349 | ||
350 | if (!adapter) | |
351 | return 0; | |
352 | ||
353 | return ACPI_HANDLE(dev) == (acpi_handle)data; | |
354 | } | |
355 | ||
aec809fc | 356 | static int i2c_acpi_match_device(struct device *dev, void *data) |
525e6fab OP |
357 | { |
358 | return ACPI_COMPANION(dev) == data; | |
359 | } | |
360 | ||
aec809fc | 361 | static struct i2c_adapter *i2c_acpi_find_adapter_by_handle(acpi_handle handle) |
525e6fab OP |
362 | { |
363 | struct device *dev; | |
364 | ||
365 | dev = bus_find_device(&i2c_bus_type, NULL, handle, | |
aec809fc | 366 | i2c_acpi_match_adapter); |
525e6fab OP |
367 | return dev ? i2c_verify_adapter(dev) : NULL; |
368 | } | |
369 | ||
aec809fc | 370 | static struct i2c_client *i2c_acpi_find_client_by_adev(struct acpi_device *adev) |
525e6fab OP |
371 | { |
372 | struct device *dev; | |
373 | ||
aec809fc | 374 | dev = bus_find_device(&i2c_bus_type, NULL, adev, i2c_acpi_match_device); |
525e6fab OP |
375 | return dev ? i2c_verify_client(dev) : NULL; |
376 | } | |
377 | ||
aec809fc | 378 | static int i2c_acpi_notify(struct notifier_block *nb, unsigned long value, |
525e6fab OP |
379 | void *arg) |
380 | { | |
381 | struct acpi_device *adev = arg; | |
382 | struct i2c_board_info info; | |
383 | acpi_handle adapter_handle; | |
384 | struct i2c_adapter *adapter; | |
385 | struct i2c_client *client; | |
386 | ||
387 | switch (value) { | |
388 | case ACPI_RECONFIG_DEVICE_ADD: | |
318ce278 | 389 | if (i2c_acpi_get_info(adev, &info, NULL, &adapter_handle)) |
525e6fab OP |
390 | break; |
391 | ||
aec809fc | 392 | adapter = i2c_acpi_find_adapter_by_handle(adapter_handle); |
525e6fab OP |
393 | if (!adapter) |
394 | break; | |
395 | ||
aec809fc | 396 | i2c_acpi_register_device(adapter, adev, &info); |
525e6fab OP |
397 | break; |
398 | case ACPI_RECONFIG_DEVICE_REMOVE: | |
399 | if (!acpi_device_enumerated(adev)) | |
400 | break; | |
401 | ||
aec809fc | 402 | client = i2c_acpi_find_client_by_adev(adev); |
525e6fab OP |
403 | if (!client) |
404 | break; | |
405 | ||
406 | i2c_unregister_device(client); | |
407 | put_device(&client->dev); | |
408 | break; | |
409 | } | |
410 | ||
411 | return NOTIFY_OK; | |
412 | } | |
413 | ||
414 | static struct notifier_block i2c_acpi_notifier = { | |
aec809fc | 415 | .notifier_call = i2c_acpi_notify, |
525e6fab | 416 | }; |
17f4a5c4 | 417 | #else /* CONFIG_ACPI */ |
aec809fc | 418 | static inline void i2c_acpi_register_devices(struct i2c_adapter *adap) { } |
525e6fab | 419 | extern struct notifier_block i2c_acpi_notifier; |
17f4a5c4 WS |
420 | #endif /* CONFIG_ACPI */ |
421 | ||
422 | #ifdef CONFIG_ACPI_I2C_OPREGION | |
423 | static int acpi_gsb_i2c_read_bytes(struct i2c_client *client, | |
424 | u8 cmd, u8 *data, u8 data_len) | |
425 | { | |
426 | ||
427 | struct i2c_msg msgs[2]; | |
428 | int ret; | |
429 | u8 *buffer; | |
430 | ||
431 | buffer = kzalloc(data_len, GFP_KERNEL); | |
432 | if (!buffer) | |
433 | return AE_NO_MEMORY; | |
434 | ||
435 | msgs[0].addr = client->addr; | |
436 | msgs[0].flags = client->flags; | |
437 | msgs[0].len = 1; | |
438 | msgs[0].buf = &cmd; | |
439 | ||
440 | msgs[1].addr = client->addr; | |
441 | msgs[1].flags = client->flags | I2C_M_RD; | |
442 | msgs[1].len = data_len; | |
443 | msgs[1].buf = buffer; | |
444 | ||
445 | ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs)); | |
446 | if (ret < 0) | |
447 | dev_err(&client->adapter->dev, "i2c read failed\n"); | |
448 | else | |
449 | memcpy(data, buffer, data_len); | |
450 | ||
451 | kfree(buffer); | |
452 | return ret; | |
453 | } | |
454 | ||
455 | static int acpi_gsb_i2c_write_bytes(struct i2c_client *client, | |
456 | u8 cmd, u8 *data, u8 data_len) | |
457 | { | |
458 | ||
459 | struct i2c_msg msgs[1]; | |
460 | u8 *buffer; | |
461 | int ret = AE_OK; | |
462 | ||
463 | buffer = kzalloc(data_len + 1, GFP_KERNEL); | |
464 | if (!buffer) | |
465 | return AE_NO_MEMORY; | |
466 | ||
467 | buffer[0] = cmd; | |
468 | memcpy(buffer + 1, data, data_len); | |
469 | ||
470 | msgs[0].addr = client->addr; | |
471 | msgs[0].flags = client->flags; | |
472 | msgs[0].len = data_len + 1; | |
473 | msgs[0].buf = buffer; | |
474 | ||
475 | ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs)); | |
476 | if (ret < 0) | |
477 | dev_err(&client->adapter->dev, "i2c write failed\n"); | |
478 | ||
479 | kfree(buffer); | |
480 | return ret; | |
481 | } | |
482 | ||
483 | static acpi_status | |
aec809fc | 484 | i2c_acpi_space_handler(u32 function, acpi_physical_address command, |
17f4a5c4 WS |
485 | u32 bits, u64 *value64, |
486 | void *handler_context, void *region_context) | |
487 | { | |
488 | struct gsb_buffer *gsb = (struct gsb_buffer *)value64; | |
aec809fc | 489 | struct i2c_acpi_handler_data *data = handler_context; |
17f4a5c4 WS |
490 | struct acpi_connection_info *info = &data->info; |
491 | struct acpi_resource_i2c_serialbus *sb; | |
492 | struct i2c_adapter *adapter = data->adapter; | |
7ef85f5f | 493 | struct i2c_client *client; |
17f4a5c4 WS |
494 | struct acpi_resource *ares; |
495 | u32 accessor_type = function >> 16; | |
496 | u8 action = function & ACPI_IO_MASK; | |
4470c725 | 497 | acpi_status ret; |
17f4a5c4 WS |
498 | int status; |
499 | ||
500 | ret = acpi_buffer_to_resource(info->connection, info->length, &ares); | |
501 | if (ACPI_FAILURE(ret)) | |
502 | return ret; | |
503 | ||
7ef85f5f JN |
504 | client = kzalloc(sizeof(*client), GFP_KERNEL); |
505 | if (!client) { | |
506 | ret = AE_NO_MEMORY; | |
507 | goto err; | |
508 | } | |
509 | ||
17f4a5c4 WS |
510 | if (!value64 || ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS) { |
511 | ret = AE_BAD_PARAMETER; | |
512 | goto err; | |
513 | } | |
514 | ||
515 | sb = &ares->data.i2c_serial_bus; | |
516 | if (sb->type != ACPI_RESOURCE_SERIAL_TYPE_I2C) { | |
517 | ret = AE_BAD_PARAMETER; | |
518 | goto err; | |
519 | } | |
520 | ||
7ef85f5f JN |
521 | client->adapter = adapter; |
522 | client->addr = sb->slave_address; | |
17f4a5c4 WS |
523 | |
524 | if (sb->access_mode == ACPI_I2C_10BIT_MODE) | |
7ef85f5f | 525 | client->flags |= I2C_CLIENT_TEN; |
17f4a5c4 WS |
526 | |
527 | switch (accessor_type) { | |
528 | case ACPI_GSB_ACCESS_ATTRIB_SEND_RCV: | |
529 | if (action == ACPI_READ) { | |
7ef85f5f | 530 | status = i2c_smbus_read_byte(client); |
17f4a5c4 WS |
531 | if (status >= 0) { |
532 | gsb->bdata = status; | |
533 | status = 0; | |
534 | } | |
535 | } else { | |
7ef85f5f | 536 | status = i2c_smbus_write_byte(client, gsb->bdata); |
17f4a5c4 WS |
537 | } |
538 | break; | |
539 | ||
540 | case ACPI_GSB_ACCESS_ATTRIB_BYTE: | |
541 | if (action == ACPI_READ) { | |
7ef85f5f | 542 | status = i2c_smbus_read_byte_data(client, command); |
17f4a5c4 WS |
543 | if (status >= 0) { |
544 | gsb->bdata = status; | |
545 | status = 0; | |
546 | } | |
547 | } else { | |
7ef85f5f | 548 | status = i2c_smbus_write_byte_data(client, command, |
17f4a5c4 WS |
549 | gsb->bdata); |
550 | } | |
551 | break; | |
552 | ||
553 | case ACPI_GSB_ACCESS_ATTRIB_WORD: | |
554 | if (action == ACPI_READ) { | |
7ef85f5f | 555 | status = i2c_smbus_read_word_data(client, command); |
17f4a5c4 WS |
556 | if (status >= 0) { |
557 | gsb->wdata = status; | |
558 | status = 0; | |
559 | } | |
560 | } else { | |
7ef85f5f | 561 | status = i2c_smbus_write_word_data(client, command, |
17f4a5c4 WS |
562 | gsb->wdata); |
563 | } | |
564 | break; | |
565 | ||
566 | case ACPI_GSB_ACCESS_ATTRIB_BLOCK: | |
567 | if (action == ACPI_READ) { | |
7ef85f5f | 568 | status = i2c_smbus_read_block_data(client, command, |
17f4a5c4 WS |
569 | gsb->data); |
570 | if (status >= 0) { | |
571 | gsb->len = status; | |
572 | status = 0; | |
573 | } | |
574 | } else { | |
7ef85f5f | 575 | status = i2c_smbus_write_block_data(client, command, |
17f4a5c4 WS |
576 | gsb->len, gsb->data); |
577 | } | |
578 | break; | |
579 | ||
580 | case ACPI_GSB_ACCESS_ATTRIB_MULTIBYTE: | |
581 | if (action == ACPI_READ) { | |
7ef85f5f | 582 | status = acpi_gsb_i2c_read_bytes(client, command, |
17f4a5c4 WS |
583 | gsb->data, info->access_length); |
584 | if (status > 0) | |
585 | status = 0; | |
586 | } else { | |
7ef85f5f | 587 | status = acpi_gsb_i2c_write_bytes(client, command, |
17f4a5c4 WS |
588 | gsb->data, info->access_length); |
589 | } | |
590 | break; | |
591 | ||
592 | default: | |
be309c3c WS |
593 | dev_warn(&adapter->dev, "protocol 0x%02x not supported for client 0x%02x\n", |
594 | accessor_type, client->addr); | |
17f4a5c4 WS |
595 | ret = AE_BAD_PARAMETER; |
596 | goto err; | |
597 | } | |
598 | ||
599 | gsb->status = status; | |
600 | ||
601 | err: | |
7ef85f5f | 602 | kfree(client); |
17f4a5c4 WS |
603 | ACPI_FREE(ares); |
604 | return ret; | |
605 | } | |
606 | ||
607 | ||
aec809fc | 608 | static int i2c_acpi_install_space_handler(struct i2c_adapter *adapter) |
17f4a5c4 | 609 | { |
0aef44e8 | 610 | acpi_handle handle; |
aec809fc | 611 | struct i2c_acpi_handler_data *data; |
17f4a5c4 WS |
612 | acpi_status status; |
613 | ||
0aef44e8 PH |
614 | if (!adapter->dev.parent) |
615 | return -ENODEV; | |
616 | ||
617 | handle = ACPI_HANDLE(adapter->dev.parent); | |
618 | ||
17f4a5c4 WS |
619 | if (!handle) |
620 | return -ENODEV; | |
621 | ||
aec809fc | 622 | data = kzalloc(sizeof(struct i2c_acpi_handler_data), |
17f4a5c4 WS |
623 | GFP_KERNEL); |
624 | if (!data) | |
625 | return -ENOMEM; | |
626 | ||
627 | data->adapter = adapter; | |
628 | status = acpi_bus_attach_private_data(handle, (void *)data); | |
629 | if (ACPI_FAILURE(status)) { | |
630 | kfree(data); | |
631 | return -ENOMEM; | |
632 | } | |
633 | ||
634 | status = acpi_install_address_space_handler(handle, | |
635 | ACPI_ADR_SPACE_GSBUS, | |
aec809fc | 636 | &i2c_acpi_space_handler, |
17f4a5c4 WS |
637 | NULL, |
638 | data); | |
639 | if (ACPI_FAILURE(status)) { | |
640 | dev_err(&adapter->dev, "Error installing i2c space handler\n"); | |
641 | acpi_bus_detach_private_data(handle); | |
642 | kfree(data); | |
643 | return -ENOMEM; | |
644 | } | |
645 | ||
40e7fcb1 | 646 | acpi_walk_dep_device_list(handle); |
17f4a5c4 WS |
647 | return 0; |
648 | } | |
649 | ||
aec809fc | 650 | static void i2c_acpi_remove_space_handler(struct i2c_adapter *adapter) |
17f4a5c4 | 651 | { |
0aef44e8 | 652 | acpi_handle handle; |
aec809fc | 653 | struct i2c_acpi_handler_data *data; |
17f4a5c4 WS |
654 | acpi_status status; |
655 | ||
0aef44e8 PH |
656 | if (!adapter->dev.parent) |
657 | return; | |
658 | ||
659 | handle = ACPI_HANDLE(adapter->dev.parent); | |
660 | ||
17f4a5c4 WS |
661 | if (!handle) |
662 | return; | |
663 | ||
664 | acpi_remove_address_space_handler(handle, | |
665 | ACPI_ADR_SPACE_GSBUS, | |
aec809fc | 666 | &i2c_acpi_space_handler); |
17f4a5c4 WS |
667 | |
668 | status = acpi_bus_get_private_data(handle, (void **)&data); | |
669 | if (ACPI_SUCCESS(status)) | |
670 | kfree(data); | |
671 | ||
672 | acpi_bus_detach_private_data(handle); | |
673 | } | |
674 | #else /* CONFIG_ACPI_I2C_OPREGION */ | |
aec809fc | 675 | static inline void i2c_acpi_remove_space_handler(struct i2c_adapter *adapter) |
17f4a5c4 WS |
676 | { } |
677 | ||
aec809fc | 678 | static inline int i2c_acpi_install_space_handler(struct i2c_adapter *adapter) |
17f4a5c4 WS |
679 | { return 0; } |
680 | #endif /* CONFIG_ACPI_I2C_OPREGION */ | |
681 | ||
f37dd80a DB |
682 | /* ------------------------------------------------------------------------- */ |
683 | ||
5f441fca | 684 | const struct i2c_device_id *i2c_match_id(const struct i2c_device_id *id, |
d2653e92 JD |
685 | const struct i2c_client *client) |
686 | { | |
811073b1 LJ |
687 | if (!(id && client)) |
688 | return NULL; | |
689 | ||
d2653e92 JD |
690 | while (id->name[0]) { |
691 | if (strcmp(client->name, id->name) == 0) | |
692 | return id; | |
693 | id++; | |
694 | } | |
695 | return NULL; | |
696 | } | |
5f441fca | 697 | EXPORT_SYMBOL_GPL(i2c_match_id); |
d2653e92 | 698 | |
1da177e4 LT |
699 | static int i2c_device_match(struct device *dev, struct device_driver *drv) |
700 | { | |
51298d12 JD |
701 | struct i2c_client *client = i2c_verify_client(dev); |
702 | struct i2c_driver *driver; | |
703 | ||
7b4fbc50 | 704 | |
959e85f7 | 705 | /* Attempt an OF style match */ |
da10c06a | 706 | if (i2c_of_match_device(drv->of_match_table, client)) |
959e85f7 GL |
707 | return 1; |
708 | ||
907ddf89 MW |
709 | /* Then ACPI style match */ |
710 | if (acpi_driver_match_device(dev, drv)) | |
711 | return 1; | |
712 | ||
51298d12 | 713 | driver = to_i2c_driver(drv); |
811073b1 LJ |
714 | |
715 | /* Finally an I2C match */ | |
716 | if (i2c_match_id(driver->id_table, client)) | |
717 | return 1; | |
d2653e92 | 718 | |
eb8a7908 | 719 | return 0; |
1da177e4 LT |
720 | } |
721 | ||
7eff2e7a | 722 | static int i2c_device_uevent(struct device *dev, struct kobj_uevent_env *env) |
7b4fbc50 | 723 | { |
8dcf3217 | 724 | struct i2c_client *client = to_i2c_client(dev); |
8c4ff6d0 ZR |
725 | int rc; |
726 | ||
727 | rc = acpi_device_uevent_modalias(dev, env); | |
728 | if (rc != -ENODEV) | |
729 | return rc; | |
7b4fbc50 | 730 | |
8dcf3217 | 731 | return add_uevent_var(env, "MODALIAS=%s%s", I2C_MODULE_PREFIX, client->name); |
7b4fbc50 DB |
732 | } |
733 | ||
5f9296ba VK |
734 | /* i2c bus recovery routines */ |
735 | static int get_scl_gpio_value(struct i2c_adapter *adap) | |
736 | { | |
737 | return gpio_get_value(adap->bus_recovery_info->scl_gpio); | |
738 | } | |
739 | ||
740 | static void set_scl_gpio_value(struct i2c_adapter *adap, int val) | |
741 | { | |
742 | gpio_set_value(adap->bus_recovery_info->scl_gpio, val); | |
743 | } | |
744 | ||
745 | static int get_sda_gpio_value(struct i2c_adapter *adap) | |
746 | { | |
747 | return gpio_get_value(adap->bus_recovery_info->sda_gpio); | |
748 | } | |
749 | ||
750 | static int i2c_get_gpios_for_recovery(struct i2c_adapter *adap) | |
751 | { | |
752 | struct i2c_bus_recovery_info *bri = adap->bus_recovery_info; | |
753 | struct device *dev = &adap->dev; | |
754 | int ret = 0; | |
755 | ||
756 | ret = gpio_request_one(bri->scl_gpio, GPIOF_OPEN_DRAIN | | |
757 | GPIOF_OUT_INIT_HIGH, "i2c-scl"); | |
758 | if (ret) { | |
759 | dev_warn(dev, "Can't get SCL gpio: %d\n", bri->scl_gpio); | |
760 | return ret; | |
761 | } | |
762 | ||
763 | if (bri->get_sda) { | |
764 | if (gpio_request_one(bri->sda_gpio, GPIOF_IN, "i2c-sda")) { | |
765 | /* work without SDA polling */ | |
766 | dev_warn(dev, "Can't get SDA gpio: %d. Not using SDA polling\n", | |
767 | bri->sda_gpio); | |
768 | bri->get_sda = NULL; | |
769 | } | |
770 | } | |
771 | ||
772 | return ret; | |
773 | } | |
774 | ||
775 | static void i2c_put_gpios_for_recovery(struct i2c_adapter *adap) | |
776 | { | |
777 | struct i2c_bus_recovery_info *bri = adap->bus_recovery_info; | |
778 | ||
779 | if (bri->get_sda) | |
780 | gpio_free(bri->sda_gpio); | |
781 | ||
782 | gpio_free(bri->scl_gpio); | |
783 | } | |
784 | ||
785 | /* | |
786 | * We are generating clock pulses. ndelay() determines durating of clk pulses. | |
787 | * We will generate clock with rate 100 KHz and so duration of both clock levels | |
788 | * is: delay in ns = (10^6 / 100) / 2 | |
789 | */ | |
790 | #define RECOVERY_NDELAY 5000 | |
791 | #define RECOVERY_CLK_CNT 9 | |
792 | ||
793 | static int i2c_generic_recovery(struct i2c_adapter *adap) | |
794 | { | |
795 | struct i2c_bus_recovery_info *bri = adap->bus_recovery_info; | |
796 | int i = 0, val = 1, ret = 0; | |
797 | ||
798 | if (bri->prepare_recovery) | |
2b2190a3 | 799 | bri->prepare_recovery(adap); |
5f9296ba | 800 | |
8b062608 JL |
801 | bri->set_scl(adap, val); |
802 | ndelay(RECOVERY_NDELAY); | |
803 | ||
5f9296ba VK |
804 | /* |
805 | * By this time SCL is high, as we need to give 9 falling-rising edges | |
806 | */ | |
807 | while (i++ < RECOVERY_CLK_CNT * 2) { | |
808 | if (val) { | |
809 | /* Break if SDA is high */ | |
810 | if (bri->get_sda && bri->get_sda(adap)) | |
811 | break; | |
812 | /* SCL shouldn't be low here */ | |
813 | if (!bri->get_scl(adap)) { | |
814 | dev_err(&adap->dev, | |
815 | "SCL is stuck low, exit recovery\n"); | |
816 | ret = -EBUSY; | |
817 | break; | |
818 | } | |
819 | } | |
820 | ||
821 | val = !val; | |
822 | bri->set_scl(adap, val); | |
823 | ndelay(RECOVERY_NDELAY); | |
824 | } | |
825 | ||
826 | if (bri->unprepare_recovery) | |
2b2190a3 | 827 | bri->unprepare_recovery(adap); |
5f9296ba VK |
828 | |
829 | return ret; | |
830 | } | |
831 | ||
832 | int i2c_generic_scl_recovery(struct i2c_adapter *adap) | |
833 | { | |
5f9296ba VK |
834 | return i2c_generic_recovery(adap); |
835 | } | |
c1c21f4e | 836 | EXPORT_SYMBOL_GPL(i2c_generic_scl_recovery); |
5f9296ba VK |
837 | |
838 | int i2c_generic_gpio_recovery(struct i2c_adapter *adap) | |
839 | { | |
840 | int ret; | |
841 | ||
842 | ret = i2c_get_gpios_for_recovery(adap); | |
843 | if (ret) | |
844 | return ret; | |
845 | ||
846 | ret = i2c_generic_recovery(adap); | |
847 | i2c_put_gpios_for_recovery(adap); | |
848 | ||
849 | return ret; | |
850 | } | |
c1c21f4e | 851 | EXPORT_SYMBOL_GPL(i2c_generic_gpio_recovery); |
5f9296ba VK |
852 | |
853 | int i2c_recover_bus(struct i2c_adapter *adap) | |
854 | { | |
855 | if (!adap->bus_recovery_info) | |
856 | return -EOPNOTSUPP; | |
857 | ||
858 | dev_dbg(&adap->dev, "Trying i2c bus recovery\n"); | |
859 | return adap->bus_recovery_info->recover_bus(adap); | |
860 | } | |
c1c21f4e | 861 | EXPORT_SYMBOL_GPL(i2c_recover_bus); |
5f9296ba | 862 | |
d3b11d83 WS |
863 | static void i2c_init_recovery(struct i2c_adapter *adap) |
864 | { | |
865 | struct i2c_bus_recovery_info *bri = adap->bus_recovery_info; | |
866 | char *err_str; | |
867 | ||
868 | if (!bri) | |
869 | return; | |
870 | ||
871 | if (!bri->recover_bus) { | |
872 | err_str = "no recover_bus() found"; | |
873 | goto err; | |
874 | } | |
875 | ||
876 | /* Generic GPIO recovery */ | |
877 | if (bri->recover_bus == i2c_generic_gpio_recovery) { | |
878 | if (!gpio_is_valid(bri->scl_gpio)) { | |
879 | err_str = "invalid SCL gpio"; | |
880 | goto err; | |
881 | } | |
882 | ||
883 | if (gpio_is_valid(bri->sda_gpio)) | |
884 | bri->get_sda = get_sda_gpio_value; | |
885 | else | |
886 | bri->get_sda = NULL; | |
887 | ||
888 | bri->get_scl = get_scl_gpio_value; | |
889 | bri->set_scl = set_scl_gpio_value; | |
890 | } else if (bri->recover_bus == i2c_generic_scl_recovery) { | |
891 | /* Generic SCL recovery */ | |
892 | if (!bri->set_scl || !bri->get_scl) { | |
893 | err_str = "no {get|set}_scl() found"; | |
894 | goto err; | |
895 | } | |
896 | } | |
897 | ||
898 | return; | |
899 | err: | |
900 | dev_err(&adap->dev, "Not using recovery: %s\n", err_str); | |
901 | adap->bus_recovery_info = NULL; | |
902 | } | |
903 | ||
4d5538f5 BT |
904 | static int i2c_smbus_host_notify_to_irq(const struct i2c_client *client) |
905 | { | |
906 | struct i2c_adapter *adap = client->adapter; | |
907 | unsigned int irq; | |
908 | ||
909 | if (!adap->host_notify_domain) | |
910 | return -ENXIO; | |
911 | ||
912 | if (client->flags & I2C_CLIENT_TEN) | |
913 | return -EINVAL; | |
914 | ||
915 | irq = irq_find_mapping(adap->host_notify_domain, client->addr); | |
916 | if (!irq) | |
917 | irq = irq_create_mapping(adap->host_notify_domain, | |
918 | client->addr); | |
919 | ||
920 | return irq > 0 ? irq : -ENXIO; | |
921 | } | |
922 | ||
f37dd80a | 923 | static int i2c_device_probe(struct device *dev) |
1da177e4 | 924 | { |
51298d12 JD |
925 | struct i2c_client *client = i2c_verify_client(dev); |
926 | struct i2c_driver *driver; | |
50c3304a | 927 | int status; |
7b4fbc50 | 928 | |
51298d12 JD |
929 | if (!client) |
930 | return 0; | |
931 | ||
845c8770 MW |
932 | if (!client->irq) { |
933 | int irq = -ENOENT; | |
934 | ||
331c3425 DT |
935 | if (client->flags & I2C_CLIENT_HOST_NOTIFY) { |
936 | dev_dbg(dev, "Using Host Notify IRQ\n"); | |
937 | irq = i2c_smbus_host_notify_to_irq(client); | |
938 | } else if (dev->of_node) { | |
3fffd128 DT |
939 | irq = of_irq_get_byname(dev->of_node, "irq"); |
940 | if (irq == -EINVAL || irq == -ENODATA) | |
941 | irq = of_irq_get(dev->of_node, 0); | |
942 | } else if (ACPI_COMPANION(dev)) { | |
845c8770 | 943 | irq = acpi_dev_gpio_irq_get(ACPI_COMPANION(dev), 0); |
3fffd128 | 944 | } |
6f34be74 | 945 | if (irq == -EPROBE_DEFER) |
2fd36c55 | 946 | return irq; |
331c3425 | 947 | |
6f34be74 GU |
948 | if (irq < 0) |
949 | irq = 0; | |
2fd36c55 LP |
950 | |
951 | client->irq = irq; | |
952 | } | |
953 | ||
51298d12 | 954 | driver = to_i2c_driver(dev->driver); |
da10c06a LJ |
955 | |
956 | /* | |
957 | * An I2C ID table is not mandatory, if and only if, a suitable Device | |
958 | * Tree match table entry is supplied for the probing device. | |
959 | */ | |
960 | if (!driver->id_table && | |
961 | !i2c_of_match_device(dev->driver->of_match_table, client)) | |
7b4fbc50 | 962 | return -ENODEV; |
0acc2b32 | 963 | |
3fffd128 DT |
964 | if (client->flags & I2C_CLIENT_WAKE) { |
965 | int wakeirq = -ENOENT; | |
966 | ||
967 | if (dev->of_node) { | |
968 | wakeirq = of_irq_get_byname(dev->of_node, "wakeup"); | |
969 | if (wakeirq == -EPROBE_DEFER) | |
970 | return wakeirq; | |
971 | } | |
972 | ||
973 | device_init_wakeup(&client->dev, true); | |
974 | ||
975 | if (wakeirq > 0 && wakeirq != client->irq) | |
976 | status = dev_pm_set_dedicated_wake_irq(dev, wakeirq); | |
977 | else if (client->irq > 0) | |
c18fba23 | 978 | status = dev_pm_set_wake_irq(dev, client->irq); |
3fffd128 DT |
979 | else |
980 | status = 0; | |
981 | ||
982 | if (status) | |
b93d3d37 | 983 | dev_warn(&client->dev, "failed to set up wakeup irq\n"); |
3fffd128 DT |
984 | } |
985 | ||
7b4fbc50 | 986 | dev_dbg(dev, "probe\n"); |
d2653e92 | 987 | |
86be408b SN |
988 | status = of_clk_set_defaults(dev->of_node, false); |
989 | if (status < 0) | |
3fffd128 | 990 | goto err_clear_wakeup_irq; |
86be408b | 991 | |
e09b0d4e | 992 | status = dev_pm_domain_attach(&client->dev, true); |
74cedd30 KB |
993 | if (status == -EPROBE_DEFER) |
994 | goto err_clear_wakeup_irq; | |
995 | ||
b8a1a4cd LJ |
996 | /* |
997 | * When there are no more users of probe(), | |
998 | * rename probe_new to probe. | |
999 | */ | |
1000 | if (driver->probe_new) | |
1001 | status = driver->probe_new(client); | |
1002 | else if (driver->probe) | |
1003 | status = driver->probe(client, | |
1004 | i2c_match_id(driver->id_table, client)); | |
1005 | else | |
1006 | status = -EINVAL; | |
1007 | ||
74cedd30 KB |
1008 | if (status) |
1009 | goto err_detach_pm_domain; | |
72fa818e | 1010 | |
3fffd128 DT |
1011 | return 0; |
1012 | ||
1013 | err_detach_pm_domain: | |
1014 | dev_pm_domain_detach(&client->dev, true); | |
1015 | err_clear_wakeup_irq: | |
1016 | dev_pm_clear_wake_irq(&client->dev); | |
1017 | device_init_wakeup(&client->dev, false); | |
50c3304a | 1018 | return status; |
f37dd80a | 1019 | } |
1da177e4 | 1020 | |
f37dd80a DB |
1021 | static int i2c_device_remove(struct device *dev) |
1022 | { | |
51298d12 | 1023 | struct i2c_client *client = i2c_verify_client(dev); |
a1d9e6e4 | 1024 | struct i2c_driver *driver; |
72fa818e | 1025 | int status = 0; |
a1d9e6e4 | 1026 | |
51298d12 | 1027 | if (!client || !dev->driver) |
a1d9e6e4 DB |
1028 | return 0; |
1029 | ||
1030 | driver = to_i2c_driver(dev->driver); | |
1031 | if (driver->remove) { | |
1032 | dev_dbg(dev, "remove\n"); | |
1033 | status = driver->remove(client); | |
a1d9e6e4 | 1034 | } |
72fa818e | 1035 | |
e09b0d4e | 1036 | dev_pm_domain_detach(&client->dev, true); |
3fffd128 DT |
1037 | |
1038 | dev_pm_clear_wake_irq(&client->dev); | |
1039 | device_init_wakeup(&client->dev, false); | |
1040 | ||
a1d9e6e4 | 1041 | return status; |
1da177e4 LT |
1042 | } |
1043 | ||
f37dd80a | 1044 | static void i2c_device_shutdown(struct device *dev) |
1da177e4 | 1045 | { |
51298d12 | 1046 | struct i2c_client *client = i2c_verify_client(dev); |
f37dd80a DB |
1047 | struct i2c_driver *driver; |
1048 | ||
51298d12 | 1049 | if (!client || !dev->driver) |
f37dd80a DB |
1050 | return; |
1051 | driver = to_i2c_driver(dev->driver); | |
1052 | if (driver->shutdown) | |
51298d12 | 1053 | driver->shutdown(client); |
1da177e4 LT |
1054 | } |
1055 | ||
9c1600ed DB |
1056 | static void i2c_client_dev_release(struct device *dev) |
1057 | { | |
1058 | kfree(to_i2c_client(dev)); | |
1059 | } | |
1060 | ||
09b8ce0a | 1061 | static ssize_t |
4f8cf824 | 1062 | show_name(struct device *dev, struct device_attribute *attr, char *buf) |
7b4fbc50 | 1063 | { |
4f8cf824 JD |
1064 | return sprintf(buf, "%s\n", dev->type == &i2c_client_type ? |
1065 | to_i2c_client(dev)->name : to_i2c_adapter(dev)->name); | |
7b4fbc50 | 1066 | } |
a5eb71b2 | 1067 | static DEVICE_ATTR(name, S_IRUGO, show_name, NULL); |
7b4fbc50 | 1068 | |
09b8ce0a ZX |
1069 | static ssize_t |
1070 | show_modalias(struct device *dev, struct device_attribute *attr, char *buf) | |
7b4fbc50 DB |
1071 | { |
1072 | struct i2c_client *client = to_i2c_client(dev); | |
8c4ff6d0 ZR |
1073 | int len; |
1074 | ||
1075 | len = acpi_device_modalias(dev, buf, PAGE_SIZE -1); | |
1076 | if (len != -ENODEV) | |
1077 | return len; | |
1078 | ||
eb8a7908 | 1079 | return sprintf(buf, "%s%s\n", I2C_MODULE_PREFIX, client->name); |
7b4fbc50 | 1080 | } |
51298d12 JD |
1081 | static DEVICE_ATTR(modalias, S_IRUGO, show_modalias, NULL); |
1082 | ||
1083 | static struct attribute *i2c_dev_attrs[] = { | |
1084 | &dev_attr_name.attr, | |
7b4fbc50 | 1085 | /* modalias helps coldplug: modprobe $(cat .../modalias) */ |
51298d12 JD |
1086 | &dev_attr_modalias.attr, |
1087 | NULL | |
1088 | }; | |
a5eb71b2 | 1089 | ATTRIBUTE_GROUPS(i2c_dev); |
54067ee2 | 1090 | |
e9ca9eb9 | 1091 | struct bus_type i2c_bus_type = { |
f37dd80a DB |
1092 | .name = "i2c", |
1093 | .match = i2c_device_match, | |
1094 | .probe = i2c_device_probe, | |
1095 | .remove = i2c_device_remove, | |
1096 | .shutdown = i2c_device_shutdown, | |
b864c7d5 | 1097 | }; |
e9ca9eb9 | 1098 | EXPORT_SYMBOL_GPL(i2c_bus_type); |
b864c7d5 | 1099 | |
51298d12 | 1100 | static struct device_type i2c_client_type = { |
a5eb71b2 | 1101 | .groups = i2c_dev_groups, |
51298d12 JD |
1102 | .uevent = i2c_device_uevent, |
1103 | .release = i2c_client_dev_release, | |
1104 | }; | |
1105 | ||
9b766b81 DB |
1106 | |
1107 | /** | |
1108 | * i2c_verify_client - return parameter as i2c_client, or NULL | |
1109 | * @dev: device, probably from some driver model iterator | |
1110 | * | |
1111 | * When traversing the driver model tree, perhaps using driver model | |
1112 | * iterators like @device_for_each_child(), you can't assume very much | |
1113 | * about the nodes you find. Use this function to avoid oopses caused | |
1114 | * by wrongly treating some non-I2C device as an i2c_client. | |
1115 | */ | |
1116 | struct i2c_client *i2c_verify_client(struct device *dev) | |
1117 | { | |
51298d12 | 1118 | return (dev->type == &i2c_client_type) |
9b766b81 DB |
1119 | ? to_i2c_client(dev) |
1120 | : NULL; | |
1121 | } | |
1122 | EXPORT_SYMBOL(i2c_verify_client); | |
1123 | ||
1124 | ||
da899f55 WS |
1125 | /* Return a unique address which takes the flags of the client into account */ |
1126 | static unsigned short i2c_encode_flags_to_addr(struct i2c_client *client) | |
1127 | { | |
1128 | unsigned short addr = client->addr; | |
1129 | ||
1130 | /* For some client flags, add an arbitrary offset to avoid collisions */ | |
1131 | if (client->flags & I2C_CLIENT_TEN) | |
1132 | addr |= I2C_ADDR_OFFSET_TEN_BIT; | |
1133 | ||
1134 | if (client->flags & I2C_CLIENT_SLAVE) | |
1135 | addr |= I2C_ADDR_OFFSET_SLAVE; | |
1136 | ||
1137 | return addr; | |
1138 | } | |
1139 | ||
3a89db5f | 1140 | /* This is a permissive address validity check, I2C address map constraints |
25985edc | 1141 | * are purposely not enforced, except for the general call address. */ |
c4019b70 | 1142 | static int i2c_check_addr_validity(unsigned addr, unsigned short flags) |
3a89db5f | 1143 | { |
c4019b70 | 1144 | if (flags & I2C_CLIENT_TEN) { |
3a89db5f | 1145 | /* 10-bit address, all values are valid */ |
c4019b70 | 1146 | if (addr > 0x3ff) |
3a89db5f JD |
1147 | return -EINVAL; |
1148 | } else { | |
1149 | /* 7-bit address, reject the general call address */ | |
c4019b70 | 1150 | if (addr == 0x00 || addr > 0x7f) |
3a89db5f JD |
1151 | return -EINVAL; |
1152 | } | |
1153 | return 0; | |
1154 | } | |
1155 | ||
656b8761 JD |
1156 | /* And this is a strict address validity check, used when probing. If a |
1157 | * device uses a reserved address, then it shouldn't be probed. 7-bit | |
1158 | * addressing is assumed, 10-bit address devices are rare and should be | |
1159 | * explicitly enumerated. */ | |
66be6056 | 1160 | static int i2c_check_7bit_addr_validity_strict(unsigned short addr) |
656b8761 JD |
1161 | { |
1162 | /* | |
1163 | * Reserved addresses per I2C specification: | |
1164 | * 0x00 General call address / START byte | |
1165 | * 0x01 CBUS address | |
1166 | * 0x02 Reserved for different bus format | |
1167 | * 0x03 Reserved for future purposes | |
1168 | * 0x04-0x07 Hs-mode master code | |
1169 | * 0x78-0x7b 10-bit slave addressing | |
1170 | * 0x7c-0x7f Reserved for future purposes | |
1171 | */ | |
1172 | if (addr < 0x08 || addr > 0x77) | |
1173 | return -EINVAL; | |
1174 | return 0; | |
1175 | } | |
1176 | ||
3b5f794b JD |
1177 | static int __i2c_check_addr_busy(struct device *dev, void *addrp) |
1178 | { | |
1179 | struct i2c_client *client = i2c_verify_client(dev); | |
1180 | int addr = *(int *)addrp; | |
1181 | ||
9bccc70a | 1182 | if (client && i2c_encode_flags_to_addr(client) == addr) |
3b5f794b JD |
1183 | return -EBUSY; |
1184 | return 0; | |
1185 | } | |
1186 | ||
0826374b ML |
1187 | /* walk up mux tree */ |
1188 | static int i2c_check_mux_parents(struct i2c_adapter *adapter, int addr) | |
1189 | { | |
97cc4d49 | 1190 | struct i2c_adapter *parent = i2c_parent_is_i2c_adapter(adapter); |
0826374b ML |
1191 | int result; |
1192 | ||
1193 | result = device_for_each_child(&adapter->dev, &addr, | |
1194 | __i2c_check_addr_busy); | |
1195 | ||
97cc4d49 JD |
1196 | if (!result && parent) |
1197 | result = i2c_check_mux_parents(parent, addr); | |
0826374b ML |
1198 | |
1199 | return result; | |
1200 | } | |
1201 | ||
1202 | /* recurse down mux tree */ | |
1203 | static int i2c_check_mux_children(struct device *dev, void *addrp) | |
1204 | { | |
1205 | int result; | |
1206 | ||
1207 | if (dev->type == &i2c_adapter_type) | |
1208 | result = device_for_each_child(dev, addrp, | |
1209 | i2c_check_mux_children); | |
1210 | else | |
1211 | result = __i2c_check_addr_busy(dev, addrp); | |
1212 | ||
1213 | return result; | |
1214 | } | |
1215 | ||
3b5f794b JD |
1216 | static int i2c_check_addr_busy(struct i2c_adapter *adapter, int addr) |
1217 | { | |
97cc4d49 | 1218 | struct i2c_adapter *parent = i2c_parent_is_i2c_adapter(adapter); |
0826374b ML |
1219 | int result = 0; |
1220 | ||
97cc4d49 JD |
1221 | if (parent) |
1222 | result = i2c_check_mux_parents(parent, addr); | |
0826374b ML |
1223 | |
1224 | if (!result) | |
1225 | result = device_for_each_child(&adapter->dev, &addr, | |
1226 | i2c_check_mux_children); | |
1227 | ||
1228 | return result; | |
3b5f794b JD |
1229 | } |
1230 | ||
fe61e07e | 1231 | /** |
8320f495 | 1232 | * i2c_adapter_lock_bus - Get exclusive access to an I2C bus segment |
fe61e07e | 1233 | * @adapter: Target I2C bus segment |
8320f495 PR |
1234 | * @flags: I2C_LOCK_ROOT_ADAPTER locks the root i2c adapter, I2C_LOCK_SEGMENT |
1235 | * locks only this branch in the adapter tree | |
fe61e07e | 1236 | */ |
8320f495 PR |
1237 | static void i2c_adapter_lock_bus(struct i2c_adapter *adapter, |
1238 | unsigned int flags) | |
fe61e07e | 1239 | { |
fa96f0cb | 1240 | rt_mutex_lock(&adapter->bus_lock); |
fe61e07e | 1241 | } |
fe61e07e JD |
1242 | |
1243 | /** | |
8320f495 | 1244 | * i2c_adapter_trylock_bus - Try to get exclusive access to an I2C bus segment |
fe61e07e | 1245 | * @adapter: Target I2C bus segment |
8320f495 PR |
1246 | * @flags: I2C_LOCK_ROOT_ADAPTER trylocks the root i2c adapter, I2C_LOCK_SEGMENT |
1247 | * trylocks only this branch in the adapter tree | |
fe61e07e | 1248 | */ |
8320f495 PR |
1249 | static int i2c_adapter_trylock_bus(struct i2c_adapter *adapter, |
1250 | unsigned int flags) | |
fe61e07e | 1251 | { |
fa96f0cb | 1252 | return rt_mutex_trylock(&adapter->bus_lock); |
fe61e07e JD |
1253 | } |
1254 | ||
1255 | /** | |
8320f495 | 1256 | * i2c_adapter_unlock_bus - Release exclusive access to an I2C bus segment |
fe61e07e | 1257 | * @adapter: Target I2C bus segment |
8320f495 PR |
1258 | * @flags: I2C_LOCK_ROOT_ADAPTER unlocks the root i2c adapter, I2C_LOCK_SEGMENT |
1259 | * unlocks only this branch in the adapter tree | |
fe61e07e | 1260 | */ |
8320f495 PR |
1261 | static void i2c_adapter_unlock_bus(struct i2c_adapter *adapter, |
1262 | unsigned int flags) | |
fe61e07e | 1263 | { |
fa96f0cb | 1264 | rt_mutex_unlock(&adapter->bus_lock); |
fe61e07e | 1265 | } |
fe61e07e | 1266 | |
70762abb JN |
1267 | static void i2c_dev_set_name(struct i2c_adapter *adap, |
1268 | struct i2c_client *client) | |
1269 | { | |
1270 | struct acpi_device *adev = ACPI_COMPANION(&client->dev); | |
1271 | ||
1272 | if (adev) { | |
1273 | dev_set_name(&client->dev, "i2c-%s", acpi_dev_name(adev)); | |
1274 | return; | |
1275 | } | |
1276 | ||
70762abb | 1277 | dev_set_name(&client->dev, "%d-%04x", i2c_adapter_id(adap), |
da899f55 | 1278 | i2c_encode_flags_to_addr(client)); |
70762abb JN |
1279 | } |
1280 | ||
9c1600ed | 1281 | /** |
f8a227e8 | 1282 | * i2c_new_device - instantiate an i2c device |
9c1600ed DB |
1283 | * @adap: the adapter managing the device |
1284 | * @info: describes one I2C device; bus_num is ignored | |
d64f73be | 1285 | * Context: can sleep |
9c1600ed | 1286 | * |
f8a227e8 JD |
1287 | * Create an i2c device. Binding is handled through driver model |
1288 | * probe()/remove() methods. A driver may be bound to this device when we | |
1289 | * return from this function, or any later moment (e.g. maybe hotplugging will | |
1290 | * load the driver module). This call is not appropriate for use by mainboard | |
1291 | * initialization logic, which usually runs during an arch_initcall() long | |
1292 | * before any i2c_adapter could exist. | |
9c1600ed DB |
1293 | * |
1294 | * This returns the new i2c client, which may be saved for later use with | |
1295 | * i2c_unregister_device(); or NULL to indicate an error. | |
1296 | */ | |
1297 | struct i2c_client * | |
1298 | i2c_new_device(struct i2c_adapter *adap, struct i2c_board_info const *info) | |
1299 | { | |
1300 | struct i2c_client *client; | |
1301 | int status; | |
1302 | ||
1303 | client = kzalloc(sizeof *client, GFP_KERNEL); | |
1304 | if (!client) | |
1305 | return NULL; | |
1306 | ||
1307 | client->adapter = adap; | |
1308 | ||
1309 | client->dev.platform_data = info->platform_data; | |
3bbb835d | 1310 | |
11f1f2af AV |
1311 | if (info->archdata) |
1312 | client->dev.archdata = *info->archdata; | |
1313 | ||
ee35425c | 1314 | client->flags = info->flags; |
9c1600ed DB |
1315 | client->addr = info->addr; |
1316 | client->irq = info->irq; | |
1317 | ||
9c1600ed DB |
1318 | strlcpy(client->name, info->type, sizeof(client->name)); |
1319 | ||
c4019b70 | 1320 | status = i2c_check_addr_validity(client->addr, client->flags); |
3a89db5f JD |
1321 | if (status) { |
1322 | dev_err(&adap->dev, "Invalid %d-bit I2C address 0x%02hx\n", | |
1323 | client->flags & I2C_CLIENT_TEN ? 10 : 7, client->addr); | |
1324 | goto out_err_silent; | |
1325 | } | |
1326 | ||
f8a227e8 | 1327 | /* Check for address business */ |
9bccc70a | 1328 | status = i2c_check_addr_busy(adap, i2c_encode_flags_to_addr(client)); |
f8a227e8 JD |
1329 | if (status) |
1330 | goto out_err; | |
1331 | ||
1332 | client->dev.parent = &client->adapter->dev; | |
1333 | client->dev.bus = &i2c_bus_type; | |
51298d12 | 1334 | client->dev.type = &i2c_client_type; |
d12d42f7 | 1335 | client->dev.of_node = info->of_node; |
ce793486 | 1336 | client->dev.fwnode = info->fwnode; |
f8a227e8 | 1337 | |
70762abb | 1338 | i2c_dev_set_name(adap, client); |
d3e1b617 DT |
1339 | |
1340 | if (info->properties) { | |
1341 | status = device_add_properties(&client->dev, info->properties); | |
1342 | if (status) { | |
1343 | dev_err(&adap->dev, | |
1344 | "Failed to add properties to client %s: %d\n", | |
1345 | client->name, status); | |
1346 | goto out_err; | |
1347 | } | |
1348 | } | |
1349 | ||
f8a227e8 JD |
1350 | status = device_register(&client->dev); |
1351 | if (status) | |
d3e1b617 | 1352 | goto out_free_props; |
f8a227e8 | 1353 | |
f8a227e8 JD |
1354 | dev_dbg(&adap->dev, "client [%s] registered with bus id %s\n", |
1355 | client->name, dev_name(&client->dev)); | |
1356 | ||
9c1600ed | 1357 | return client; |
f8a227e8 | 1358 | |
d3e1b617 DT |
1359 | out_free_props: |
1360 | if (info->properties) | |
1361 | device_remove_properties(&client->dev); | |
f8a227e8 | 1362 | out_err: |
b93d3d37 AS |
1363 | dev_err(&adap->dev, |
1364 | "Failed to register i2c client %s at 0x%02x (%d)\n", | |
1365 | client->name, client->addr, status); | |
3a89db5f | 1366 | out_err_silent: |
f8a227e8 JD |
1367 | kfree(client); |
1368 | return NULL; | |
9c1600ed DB |
1369 | } |
1370 | EXPORT_SYMBOL_GPL(i2c_new_device); | |
1371 | ||
1372 | ||
1373 | /** | |
1374 | * i2c_unregister_device - reverse effect of i2c_new_device() | |
1375 | * @client: value returned from i2c_new_device() | |
d64f73be | 1376 | * Context: can sleep |
9c1600ed DB |
1377 | */ |
1378 | void i2c_unregister_device(struct i2c_client *client) | |
a1d9e6e4 | 1379 | { |
4f001fd3 PA |
1380 | if (client->dev.of_node) |
1381 | of_node_clear_flag(client->dev.of_node, OF_POPULATED); | |
525e6fab OP |
1382 | if (ACPI_COMPANION(&client->dev)) |
1383 | acpi_device_clear_enumerated(ACPI_COMPANION(&client->dev)); | |
a1d9e6e4 DB |
1384 | device_unregister(&client->dev); |
1385 | } | |
9c1600ed | 1386 | EXPORT_SYMBOL_GPL(i2c_unregister_device); |
a1d9e6e4 DB |
1387 | |
1388 | ||
60b129d7 JD |
1389 | static const struct i2c_device_id dummy_id[] = { |
1390 | { "dummy", 0 }, | |
1391 | { }, | |
1392 | }; | |
1393 | ||
d2653e92 JD |
1394 | static int dummy_probe(struct i2c_client *client, |
1395 | const struct i2c_device_id *id) | |
1396 | { | |
1397 | return 0; | |
1398 | } | |
1399 | ||
1400 | static int dummy_remove(struct i2c_client *client) | |
e9f1373b DB |
1401 | { |
1402 | return 0; | |
1403 | } | |
1404 | ||
1405 | static struct i2c_driver dummy_driver = { | |
1406 | .driver.name = "dummy", | |
d2653e92 JD |
1407 | .probe = dummy_probe, |
1408 | .remove = dummy_remove, | |
60b129d7 | 1409 | .id_table = dummy_id, |
e9f1373b DB |
1410 | }; |
1411 | ||
1412 | /** | |
1413 | * i2c_new_dummy - return a new i2c device bound to a dummy driver | |
1414 | * @adapter: the adapter managing the device | |
1415 | * @address: seven bit address to be used | |
e9f1373b DB |
1416 | * Context: can sleep |
1417 | * | |
1418 | * This returns an I2C client bound to the "dummy" driver, intended for use | |
1419 | * with devices that consume multiple addresses. Examples of such chips | |
1420 | * include various EEPROMS (like 24c04 and 24c08 models). | |
1421 | * | |
1422 | * These dummy devices have two main uses. First, most I2C and SMBus calls | |
1423 | * except i2c_transfer() need a client handle; the dummy will be that handle. | |
1424 | * And second, this prevents the specified address from being bound to a | |
1425 | * different driver. | |
1426 | * | |
1427 | * This returns the new i2c client, which should be saved for later use with | |
1428 | * i2c_unregister_device(); or NULL to indicate an error. | |
1429 | */ | |
09b8ce0a | 1430 | struct i2c_client *i2c_new_dummy(struct i2c_adapter *adapter, u16 address) |
e9f1373b DB |
1431 | { |
1432 | struct i2c_board_info info = { | |
60b129d7 | 1433 | I2C_BOARD_INFO("dummy", address), |
e9f1373b DB |
1434 | }; |
1435 | ||
e9f1373b DB |
1436 | return i2c_new_device(adapter, &info); |
1437 | } | |
1438 | EXPORT_SYMBOL_GPL(i2c_new_dummy); | |
1439 | ||
0f614d83 JMH |
1440 | /** |
1441 | * i2c_new_secondary_device - Helper to get the instantiated secondary address | |
1442 | * and create the associated device | |
1443 | * @client: Handle to the primary client | |
1444 | * @name: Handle to specify which secondary address to get | |
1445 | * @default_addr: Used as a fallback if no secondary address was specified | |
1446 | * Context: can sleep | |
1447 | * | |
1448 | * I2C clients can be composed of multiple I2C slaves bound together in a single | |
1449 | * component. The I2C client driver then binds to the master I2C slave and needs | |
1450 | * to create I2C dummy clients to communicate with all the other slaves. | |
1451 | * | |
1452 | * This function creates and returns an I2C dummy client whose I2C address is | |
1453 | * retrieved from the platform firmware based on the given slave name. If no | |
1454 | * address is specified by the firmware default_addr is used. | |
1455 | * | |
1456 | * On DT-based platforms the address is retrieved from the "reg" property entry | |
1457 | * cell whose "reg-names" value matches the slave name. | |
1458 | * | |
1459 | * This returns the new i2c client, which should be saved for later use with | |
1460 | * i2c_unregister_device(); or NULL to indicate an error. | |
1461 | */ | |
1462 | struct i2c_client *i2c_new_secondary_device(struct i2c_client *client, | |
1463 | const char *name, | |
1464 | u16 default_addr) | |
1465 | { | |
1466 | struct device_node *np = client->dev.of_node; | |
1467 | u32 addr = default_addr; | |
1468 | int i; | |
1469 | ||
1470 | if (np) { | |
1471 | i = of_property_match_string(np, "reg-names", name); | |
1472 | if (i >= 0) | |
1473 | of_property_read_u32_index(np, "reg", i, &addr); | |
1474 | } | |
1475 | ||
1476 | dev_dbg(&client->adapter->dev, "Address for %s : 0x%x\n", name, addr); | |
1477 | return i2c_new_dummy(client->adapter, addr); | |
1478 | } | |
1479 | EXPORT_SYMBOL_GPL(i2c_new_secondary_device); | |
1480 | ||
f37dd80a DB |
1481 | /* ------------------------------------------------------------------------- */ |
1482 | ||
16ffadfc DB |
1483 | /* I2C bus adapters -- one roots each I2C or SMBUS segment */ |
1484 | ||
83eaaed0 | 1485 | static void i2c_adapter_dev_release(struct device *dev) |
1da177e4 | 1486 | { |
ef2c8321 | 1487 | struct i2c_adapter *adap = to_i2c_adapter(dev); |
1da177e4 LT |
1488 | complete(&adap->dev_released); |
1489 | } | |
1490 | ||
8dd1fe15 | 1491 | unsigned int i2c_adapter_depth(struct i2c_adapter *adapter) |
390946b1 JD |
1492 | { |
1493 | unsigned int depth = 0; | |
1494 | ||
1495 | while ((adapter = i2c_parent_is_i2c_adapter(adapter))) | |
1496 | depth++; | |
1497 | ||
2771dc34 BG |
1498 | WARN_ONCE(depth >= MAX_LOCKDEP_SUBCLASSES, |
1499 | "adapter depth exceeds lockdep subclass limit\n"); | |
1500 | ||
390946b1 JD |
1501 | return depth; |
1502 | } | |
8dd1fe15 | 1503 | EXPORT_SYMBOL_GPL(i2c_adapter_depth); |
390946b1 | 1504 | |
99cd8e25 JD |
1505 | /* |
1506 | * Let users instantiate I2C devices through sysfs. This can be used when | |
1507 | * platform initialization code doesn't contain the proper data for | |
1508 | * whatever reason. Also useful for drivers that do device detection and | |
1509 | * detection fails, either because the device uses an unexpected address, | |
1510 | * or this is a compatible device with different ID register values. | |
1511 | * | |
1512 | * Parameter checking may look overzealous, but we really don't want | |
1513 | * the user to provide incorrect parameters. | |
1514 | */ | |
1515 | static ssize_t | |
1516 | i2c_sysfs_new_device(struct device *dev, struct device_attribute *attr, | |
1517 | const char *buf, size_t count) | |
1518 | { | |
1519 | struct i2c_adapter *adap = to_i2c_adapter(dev); | |
1520 | struct i2c_board_info info; | |
1521 | struct i2c_client *client; | |
1522 | char *blank, end; | |
1523 | int res; | |
1524 | ||
99cd8e25 JD |
1525 | memset(&info, 0, sizeof(struct i2c_board_info)); |
1526 | ||
1527 | blank = strchr(buf, ' '); | |
1528 | if (!blank) { | |
1529 | dev_err(dev, "%s: Missing parameters\n", "new_device"); | |
1530 | return -EINVAL; | |
1531 | } | |
1532 | if (blank - buf > I2C_NAME_SIZE - 1) { | |
1533 | dev_err(dev, "%s: Invalid device name\n", "new_device"); | |
1534 | return -EINVAL; | |
1535 | } | |
1536 | memcpy(info.type, buf, blank - buf); | |
1537 | ||
1538 | /* Parse remaining parameters, reject extra parameters */ | |
1539 | res = sscanf(++blank, "%hi%c", &info.addr, &end); | |
1540 | if (res < 1) { | |
1541 | dev_err(dev, "%s: Can't parse I2C address\n", "new_device"); | |
1542 | return -EINVAL; | |
1543 | } | |
1544 | if (res > 1 && end != '\n') { | |
1545 | dev_err(dev, "%s: Extra parameters\n", "new_device"); | |
1546 | return -EINVAL; | |
1547 | } | |
1548 | ||
cfa0327b WS |
1549 | if ((info.addr & I2C_ADDR_OFFSET_TEN_BIT) == I2C_ADDR_OFFSET_TEN_BIT) { |
1550 | info.addr &= ~I2C_ADDR_OFFSET_TEN_BIT; | |
1551 | info.flags |= I2C_CLIENT_TEN; | |
1552 | } | |
1553 | ||
1554 | if (info.addr & I2C_ADDR_OFFSET_SLAVE) { | |
1555 | info.addr &= ~I2C_ADDR_OFFSET_SLAVE; | |
1556 | info.flags |= I2C_CLIENT_SLAVE; | |
1557 | } | |
1558 | ||
99cd8e25 JD |
1559 | client = i2c_new_device(adap, &info); |
1560 | if (!client) | |
3a89db5f | 1561 | return -EINVAL; |
99cd8e25 JD |
1562 | |
1563 | /* Keep track of the added device */ | |
dafc50d1 | 1564 | mutex_lock(&adap->userspace_clients_lock); |
6629dcff | 1565 | list_add_tail(&client->detected, &adap->userspace_clients); |
dafc50d1 | 1566 | mutex_unlock(&adap->userspace_clients_lock); |
99cd8e25 JD |
1567 | dev_info(dev, "%s: Instantiated device %s at 0x%02hx\n", "new_device", |
1568 | info.type, info.addr); | |
1569 | ||
1570 | return count; | |
1571 | } | |
a5eb71b2 | 1572 | static DEVICE_ATTR(new_device, S_IWUSR, NULL, i2c_sysfs_new_device); |
99cd8e25 JD |
1573 | |
1574 | /* | |
1575 | * And of course let the users delete the devices they instantiated, if | |
1576 | * they got it wrong. This interface can only be used to delete devices | |
1577 | * instantiated by i2c_sysfs_new_device above. This guarantees that we | |
1578 | * don't delete devices to which some kernel code still has references. | |
1579 | * | |
1580 | * Parameter checking may look overzealous, but we really don't want | |
1581 | * the user to delete the wrong device. | |
1582 | */ | |
1583 | static ssize_t | |
1584 | i2c_sysfs_delete_device(struct device *dev, struct device_attribute *attr, | |
1585 | const char *buf, size_t count) | |
1586 | { | |
1587 | struct i2c_adapter *adap = to_i2c_adapter(dev); | |
1588 | struct i2c_client *client, *next; | |
1589 | unsigned short addr; | |
1590 | char end; | |
1591 | int res; | |
1592 | ||
1593 | /* Parse parameters, reject extra parameters */ | |
1594 | res = sscanf(buf, "%hi%c", &addr, &end); | |
1595 | if (res < 1) { | |
1596 | dev_err(dev, "%s: Can't parse I2C address\n", "delete_device"); | |
1597 | return -EINVAL; | |
1598 | } | |
1599 | if (res > 1 && end != '\n') { | |
1600 | dev_err(dev, "%s: Extra parameters\n", "delete_device"); | |
1601 | return -EINVAL; | |
1602 | } | |
1603 | ||
1604 | /* Make sure the device was added through sysfs */ | |
1605 | res = -ENOENT; | |
390946b1 JD |
1606 | mutex_lock_nested(&adap->userspace_clients_lock, |
1607 | i2c_adapter_depth(adap)); | |
6629dcff JD |
1608 | list_for_each_entry_safe(client, next, &adap->userspace_clients, |
1609 | detected) { | |
cfa0327b | 1610 | if (i2c_encode_flags_to_addr(client) == addr) { |
99cd8e25 JD |
1611 | dev_info(dev, "%s: Deleting device %s at 0x%02hx\n", |
1612 | "delete_device", client->name, client->addr); | |
1613 | ||
1614 | list_del(&client->detected); | |
1615 | i2c_unregister_device(client); | |
1616 | res = count; | |
1617 | break; | |
1618 | } | |
1619 | } | |
dafc50d1 | 1620 | mutex_unlock(&adap->userspace_clients_lock); |
99cd8e25 JD |
1621 | |
1622 | if (res < 0) | |
1623 | dev_err(dev, "%s: Can't find device in list\n", | |
1624 | "delete_device"); | |
1625 | return res; | |
1626 | } | |
e9b526fe AS |
1627 | static DEVICE_ATTR_IGNORE_LOCKDEP(delete_device, S_IWUSR, NULL, |
1628 | i2c_sysfs_delete_device); | |
4f8cf824 JD |
1629 | |
1630 | static struct attribute *i2c_adapter_attrs[] = { | |
1631 | &dev_attr_name.attr, | |
1632 | &dev_attr_new_device.attr, | |
1633 | &dev_attr_delete_device.attr, | |
1634 | NULL | |
1635 | }; | |
a5eb71b2 | 1636 | ATTRIBUTE_GROUPS(i2c_adapter); |
b119dc3f | 1637 | |
0826374b | 1638 | struct device_type i2c_adapter_type = { |
a5eb71b2 | 1639 | .groups = i2c_adapter_groups, |
4f8cf824 | 1640 | .release = i2c_adapter_dev_release, |
1da177e4 | 1641 | }; |
0826374b | 1642 | EXPORT_SYMBOL_GPL(i2c_adapter_type); |
1da177e4 | 1643 | |
643dd09e SW |
1644 | /** |
1645 | * i2c_verify_adapter - return parameter as i2c_adapter or NULL | |
1646 | * @dev: device, probably from some driver model iterator | |
1647 | * | |
1648 | * When traversing the driver model tree, perhaps using driver model | |
1649 | * iterators like @device_for_each_child(), you can't assume very much | |
1650 | * about the nodes you find. Use this function to avoid oopses caused | |
1651 | * by wrongly treating some non-I2C device as an i2c_adapter. | |
1652 | */ | |
1653 | struct i2c_adapter *i2c_verify_adapter(struct device *dev) | |
1654 | { | |
1655 | return (dev->type == &i2c_adapter_type) | |
1656 | ? to_i2c_adapter(dev) | |
1657 | : NULL; | |
1658 | } | |
1659 | EXPORT_SYMBOL(i2c_verify_adapter); | |
1660 | ||
2bb5095a JD |
1661 | #ifdef CONFIG_I2C_COMPAT |
1662 | static struct class_compat *i2c_adapter_compat_class; | |
1663 | #endif | |
1664 | ||
9c1600ed DB |
1665 | static void i2c_scan_static_board_info(struct i2c_adapter *adapter) |
1666 | { | |
1667 | struct i2c_devinfo *devinfo; | |
1668 | ||
f18c41da | 1669 | down_read(&__i2c_board_lock); |
9c1600ed DB |
1670 | list_for_each_entry(devinfo, &__i2c_board_list, list) { |
1671 | if (devinfo->busnum == adapter->nr | |
1672 | && !i2c_new_device(adapter, | |
1673 | &devinfo->board_info)) | |
09b8ce0a ZX |
1674 | dev_err(&adapter->dev, |
1675 | "Can't create device at 0x%02x\n", | |
9c1600ed DB |
1676 | devinfo->board_info.addr); |
1677 | } | |
f18c41da | 1678 | up_read(&__i2c_board_lock); |
9c1600ed DB |
1679 | } |
1680 | ||
687b81d0 WS |
1681 | /* OF support code */ |
1682 | ||
1683 | #if IS_ENABLED(CONFIG_OF) | |
a430a345 PA |
1684 | static struct i2c_client *of_i2c_register_device(struct i2c_adapter *adap, |
1685 | struct device_node *node) | |
687b81d0 | 1686 | { |
a430a345 PA |
1687 | struct i2c_client *result; |
1688 | struct i2c_board_info info = {}; | |
1689 | struct dev_archdata dev_ad = {}; | |
b4e2f6ac WS |
1690 | const __be32 *addr_be; |
1691 | u32 addr; | |
a430a345 | 1692 | int len; |
687b81d0 | 1693 | |
a430a345 | 1694 | dev_dbg(&adap->dev, "of_i2c: register %s\n", node->full_name); |
687b81d0 | 1695 | |
a430a345 PA |
1696 | if (of_modalias_node(node, info.type, sizeof(info.type)) < 0) { |
1697 | dev_err(&adap->dev, "of_i2c: modalias failure on %s\n", | |
1698 | node->full_name); | |
1699 | return ERR_PTR(-EINVAL); | |
1700 | } | |
687b81d0 | 1701 | |
b4e2f6ac WS |
1702 | addr_be = of_get_property(node, "reg", &len); |
1703 | if (!addr_be || (len < sizeof(*addr_be))) { | |
a430a345 PA |
1704 | dev_err(&adap->dev, "of_i2c: invalid reg on %s\n", |
1705 | node->full_name); | |
1706 | return ERR_PTR(-EINVAL); | |
1707 | } | |
687b81d0 | 1708 | |
b4e2f6ac WS |
1709 | addr = be32_to_cpup(addr_be); |
1710 | if (addr & I2C_TEN_BIT_ADDRESS) { | |
1711 | addr &= ~I2C_TEN_BIT_ADDRESS; | |
1712 | info.flags |= I2C_CLIENT_TEN; | |
1713 | } | |
1714 | ||
1715 | if (addr & I2C_OWN_SLAVE_ADDRESS) { | |
1716 | addr &= ~I2C_OWN_SLAVE_ADDRESS; | |
1717 | info.flags |= I2C_CLIENT_SLAVE; | |
1718 | } | |
1719 | ||
1720 | if (i2c_check_addr_validity(addr, info.flags)) { | |
a430a345 | 1721 | dev_err(&adap->dev, "of_i2c: invalid addr=%x on %s\n", |
6f724fb3 | 1722 | addr, node->full_name); |
a430a345 PA |
1723 | return ERR_PTR(-EINVAL); |
1724 | } | |
687b81d0 | 1725 | |
b4e2f6ac | 1726 | info.addr = addr; |
a430a345 PA |
1727 | info.of_node = of_node_get(node); |
1728 | info.archdata = &dev_ad; | |
687b81d0 | 1729 | |
331c3425 DT |
1730 | if (of_property_read_bool(node, "host-notify")) |
1731 | info.flags |= I2C_CLIENT_HOST_NOTIFY; | |
1732 | ||
a430a345 PA |
1733 | if (of_get_property(node, "wakeup-source", NULL)) |
1734 | info.flags |= I2C_CLIENT_WAKE; | |
687b81d0 | 1735 | |
a430a345 PA |
1736 | result = i2c_new_device(adap, &info); |
1737 | if (result == NULL) { | |
1738 | dev_err(&adap->dev, "of_i2c: Failure registering %s\n", | |
1739 | node->full_name); | |
1740 | of_node_put(node); | |
a430a345 PA |
1741 | return ERR_PTR(-EINVAL); |
1742 | } | |
1743 | return result; | |
1744 | } | |
687b81d0 | 1745 | |
a430a345 PA |
1746 | static void of_i2c_register_devices(struct i2c_adapter *adap) |
1747 | { | |
7e4c224a | 1748 | struct device_node *bus, *node; |
6a676fb6 | 1749 | struct i2c_client *client; |
687b81d0 | 1750 | |
a430a345 PA |
1751 | /* Only register child devices if the adapter has a node pointer set */ |
1752 | if (!adap->dev.of_node) | |
1753 | return; | |
687b81d0 | 1754 | |
a430a345 PA |
1755 | dev_dbg(&adap->dev, "of_i2c: walking child nodes\n"); |
1756 | ||
7e4c224a JH |
1757 | bus = of_get_child_by_name(adap->dev.of_node, "i2c-bus"); |
1758 | if (!bus) | |
1759 | bus = of_node_get(adap->dev.of_node); | |
1760 | ||
1761 | for_each_available_child_of_node(bus, node) { | |
4f001fd3 PA |
1762 | if (of_node_test_and_set_flag(node, OF_POPULATED)) |
1763 | continue; | |
6a676fb6 RR |
1764 | |
1765 | client = of_i2c_register_device(adap, node); | |
1766 | if (IS_ERR(client)) { | |
1767 | dev_warn(&adap->dev, | |
1768 | "Failed to create I2C device for %s\n", | |
1769 | node->full_name); | |
1770 | of_node_clear_flag(node, OF_POPULATED); | |
1771 | } | |
4f001fd3 | 1772 | } |
7e4c224a JH |
1773 | |
1774 | of_node_put(bus); | |
687b81d0 WS |
1775 | } |
1776 | ||
1777 | static int of_dev_node_match(struct device *dev, void *data) | |
1778 | { | |
1779 | return dev->of_node == data; | |
1780 | } | |
1781 | ||
1782 | /* must call put_device() when done with returned i2c_client device */ | |
1783 | struct i2c_client *of_find_i2c_device_by_node(struct device_node *node) | |
1784 | { | |
1785 | struct device *dev; | |
e3311469 | 1786 | struct i2c_client *client; |
687b81d0 | 1787 | |
e3311469 | 1788 | dev = bus_find_device(&i2c_bus_type, NULL, node, of_dev_node_match); |
687b81d0 WS |
1789 | if (!dev) |
1790 | return NULL; | |
1791 | ||
e3311469 VZ |
1792 | client = i2c_verify_client(dev); |
1793 | if (!client) | |
1794 | put_device(dev); | |
1795 | ||
1796 | return client; | |
687b81d0 WS |
1797 | } |
1798 | EXPORT_SYMBOL(of_find_i2c_device_by_node); | |
1799 | ||
1800 | /* must call put_device() when done with returned i2c_adapter device */ | |
1801 | struct i2c_adapter *of_find_i2c_adapter_by_node(struct device_node *node) | |
1802 | { | |
1803 | struct device *dev; | |
e3311469 | 1804 | struct i2c_adapter *adapter; |
687b81d0 | 1805 | |
e3311469 | 1806 | dev = bus_find_device(&i2c_bus_type, NULL, node, of_dev_node_match); |
687b81d0 WS |
1807 | if (!dev) |
1808 | return NULL; | |
1809 | ||
e3311469 VZ |
1810 | adapter = i2c_verify_adapter(dev); |
1811 | if (!adapter) | |
1812 | put_device(dev); | |
1813 | ||
1814 | return adapter; | |
687b81d0 WS |
1815 | } |
1816 | EXPORT_SYMBOL(of_find_i2c_adapter_by_node); | |
48e9743d VZ |
1817 | |
1818 | /* must call i2c_put_adapter() when done with returned i2c_adapter device */ | |
1819 | struct i2c_adapter *of_get_i2c_adapter_by_node(struct device_node *node) | |
1820 | { | |
1821 | struct i2c_adapter *adapter; | |
1822 | ||
1823 | adapter = of_find_i2c_adapter_by_node(node); | |
1824 | if (!adapter) | |
1825 | return NULL; | |
1826 | ||
1827 | if (!try_module_get(adapter->owner)) { | |
1828 | put_device(&adapter->dev); | |
1829 | adapter = NULL; | |
1830 | } | |
1831 | ||
1832 | return adapter; | |
1833 | } | |
1834 | EXPORT_SYMBOL(of_get_i2c_adapter_by_node); | |
cabcf4f6 LJ |
1835 | |
1836 | static const struct of_device_id* | |
1837 | i2c_of_match_device_sysfs(const struct of_device_id *matches, | |
1838 | struct i2c_client *client) | |
1839 | { | |
1840 | const char *name; | |
1841 | ||
1842 | for (; matches->compatible[0]; matches++) { | |
1843 | /* | |
1844 | * Adding devices through the i2c sysfs interface provides us | |
1845 | * a string to match which may be compatible with the device | |
1846 | * tree compatible strings, however with no actual of_node the | |
1847 | * of_match_device() will not match | |
1848 | */ | |
1849 | if (sysfs_streq(client->name, matches->compatible)) | |
1850 | return matches; | |
1851 | ||
1852 | name = strchr(matches->compatible, ','); | |
1853 | if (!name) | |
1854 | name = matches->compatible; | |
1855 | else | |
1856 | name++; | |
1857 | ||
1858 | if (sysfs_streq(client->name, name)) | |
1859 | return matches; | |
1860 | } | |
1861 | ||
1862 | return NULL; | |
1863 | } | |
1864 | ||
298d4de1 LJ |
1865 | const struct of_device_id |
1866 | *i2c_of_match_device(const struct of_device_id *matches, | |
1867 | struct i2c_client *client) | |
1868 | { | |
1869 | const struct of_device_id *match; | |
1870 | ||
1871 | if (!(client && matches)) | |
1872 | return NULL; | |
1873 | ||
1874 | match = of_match_device(matches, &client->dev); | |
1875 | if (match) | |
1876 | return match; | |
1877 | ||
1878 | return i2c_of_match_device_sysfs(matches, client); | |
1879 | } | |
1880 | EXPORT_SYMBOL_GPL(i2c_of_match_device); | |
687b81d0 WS |
1881 | #else |
1882 | static void of_i2c_register_devices(struct i2c_adapter *adap) { } | |
1883 | #endif /* CONFIG_OF */ | |
1884 | ||
69b0089a JD |
1885 | static int i2c_do_add_adapter(struct i2c_driver *driver, |
1886 | struct i2c_adapter *adap) | |
026526f5 | 1887 | { |
4735c98f JD |
1888 | /* Detect supported devices on that bus, and instantiate them */ |
1889 | i2c_detect(adap, driver); | |
1890 | ||
1891 | /* Let legacy drivers scan this bus for matching devices */ | |
026526f5 | 1892 | if (driver->attach_adapter) { |
a920ff41 JD |
1893 | dev_warn(&adap->dev, "%s: attach_adapter method is deprecated\n", |
1894 | driver->driver.name); | |
b93d3d37 AS |
1895 | dev_warn(&adap->dev, |
1896 | "Please use another way to instantiate your i2c_client\n"); | |
026526f5 JD |
1897 | /* We ignore the return code; if it fails, too bad */ |
1898 | driver->attach_adapter(adap); | |
1899 | } | |
1900 | return 0; | |
1901 | } | |
1902 | ||
69b0089a JD |
1903 | static int __process_new_adapter(struct device_driver *d, void *data) |
1904 | { | |
1905 | return i2c_do_add_adapter(to_i2c_driver(d), data); | |
1906 | } | |
1907 | ||
d1ed7985 PR |
1908 | static const struct i2c_lock_operations i2c_adapter_lock_ops = { |
1909 | .lock_bus = i2c_adapter_lock_bus, | |
1910 | .trylock_bus = i2c_adapter_trylock_bus, | |
1911 | .unlock_bus = i2c_adapter_unlock_bus, | |
1912 | }; | |
1913 | ||
4d5538f5 BT |
1914 | static void i2c_host_notify_irq_teardown(struct i2c_adapter *adap) |
1915 | { | |
1916 | struct irq_domain *domain = adap->host_notify_domain; | |
1917 | irq_hw_number_t hwirq; | |
1918 | ||
1919 | if (!domain) | |
1920 | return; | |
1921 | ||
1922 | for (hwirq = 0 ; hwirq < I2C_ADDR_7BITS_COUNT ; hwirq++) | |
1923 | irq_dispose_mapping(irq_find_mapping(domain, hwirq)); | |
1924 | ||
1925 | irq_domain_remove(domain); | |
1926 | adap->host_notify_domain = NULL; | |
1927 | } | |
1928 | ||
1929 | static int i2c_host_notify_irq_map(struct irq_domain *h, | |
1930 | unsigned int virq, | |
1931 | irq_hw_number_t hw_irq_num) | |
1932 | { | |
1933 | irq_set_chip_and_handler(virq, &dummy_irq_chip, handle_simple_irq); | |
1934 | ||
1935 | return 0; | |
1936 | } | |
1937 | ||
1938 | static const struct irq_domain_ops i2c_host_notify_irq_ops = { | |
1939 | .map = i2c_host_notify_irq_map, | |
1940 | }; | |
1941 | ||
1942 | static int i2c_setup_host_notify_irq_domain(struct i2c_adapter *adap) | |
1943 | { | |
1944 | struct irq_domain *domain; | |
1945 | ||
1946 | if (!i2c_check_functionality(adap, I2C_FUNC_SMBUS_HOST_NOTIFY)) | |
1947 | return 0; | |
1948 | ||
1949 | domain = irq_domain_create_linear(adap->dev.fwnode, | |
1950 | I2C_ADDR_7BITS_COUNT, | |
1951 | &i2c_host_notify_irq_ops, adap); | |
1952 | if (!domain) | |
1953 | return -ENOMEM; | |
1954 | ||
1955 | adap->host_notify_domain = domain; | |
1956 | ||
1957 | return 0; | |
1958 | } | |
1959 | ||
1960 | /** | |
1961 | * i2c_handle_smbus_host_notify - Forward a Host Notify event to the correct | |
1962 | * I2C client. | |
1963 | * @adap: the adapter | |
1964 | * @addr: the I2C address of the notifying device | |
1965 | * Context: can't sleep | |
1966 | * | |
1967 | * Helper function to be called from an I2C bus driver's interrupt | |
1968 | * handler. It will schedule the Host Notify IRQ. | |
1969 | */ | |
1970 | int i2c_handle_smbus_host_notify(struct i2c_adapter *adap, unsigned short addr) | |
1971 | { | |
1972 | int irq; | |
1973 | ||
1974 | if (!adap) | |
1975 | return -EINVAL; | |
1976 | ||
1977 | irq = irq_find_mapping(adap->host_notify_domain, addr); | |
1978 | if (irq <= 0) | |
1979 | return -ENXIO; | |
1980 | ||
1981 | generic_handle_irq(irq); | |
1982 | ||
1983 | return 0; | |
1984 | } | |
1985 | EXPORT_SYMBOL_GPL(i2c_handle_smbus_host_notify); | |
1986 | ||
6e13e641 | 1987 | static int i2c_register_adapter(struct i2c_adapter *adap) |
1da177e4 | 1988 | { |
ce0dffaf | 1989 | int res = -EINVAL; |
1da177e4 | 1990 | |
1d0b19c9 | 1991 | /* Can't register until after driver model init */ |
95026658 | 1992 | if (WARN_ON(!is_registered)) { |
35fc37f8 JD |
1993 | res = -EAGAIN; |
1994 | goto out_list; | |
1995 | } | |
1d0b19c9 | 1996 | |
2236baa7 | 1997 | /* Sanity checks */ |
8ddfe410 | 1998 | if (WARN(!adap->name[0], "i2c adapter has no name")) |
ce0dffaf | 1999 | goto out_list; |
8ddfe410 WS |
2000 | |
2001 | if (!adap->algo) { | |
44239a5a | 2002 | pr_err("adapter '%s': no algo supplied!\n", adap->name); |
ce0dffaf | 2003 | goto out_list; |
2236baa7 JD |
2004 | } |
2005 | ||
d1ed7985 PR |
2006 | if (!adap->lock_ops) |
2007 | adap->lock_ops = &i2c_adapter_lock_ops; | |
8320f495 | 2008 | |
194684e5 | 2009 | rt_mutex_init(&adap->bus_lock); |
6ef91fcc | 2010 | rt_mutex_init(&adap->mux_lock); |
dafc50d1 | 2011 | mutex_init(&adap->userspace_clients_lock); |
6629dcff | 2012 | INIT_LIST_HEAD(&adap->userspace_clients); |
1da177e4 | 2013 | |
8fcfef6e JD |
2014 | /* Set default timeout to 1 second if not already set */ |
2015 | if (adap->timeout == 0) | |
2016 | adap->timeout = HZ; | |
2017 | ||
4d5538f5 BT |
2018 | /* register soft irqs for Host Notify */ |
2019 | res = i2c_setup_host_notify_irq_domain(adap); | |
2020 | if (res) { | |
2021 | pr_err("adapter '%s': can't create Host Notify IRQs (%d)\n", | |
2022 | adap->name, res); | |
2023 | goto out_list; | |
2024 | } | |
2025 | ||
27d9c183 | 2026 | dev_set_name(&adap->dev, "i2c-%d", adap->nr); |
4f8cf824 JD |
2027 | adap->dev.bus = &i2c_bus_type; |
2028 | adap->dev.type = &i2c_adapter_type; | |
b119c6c9 | 2029 | res = device_register(&adap->dev); |
8ddfe410 | 2030 | if (res) { |
44239a5a | 2031 | pr_err("adapter '%s': can't register device (%d)\n", adap->name, res); |
b119c6c9 | 2032 | goto out_list; |
8ddfe410 | 2033 | } |
1da177e4 | 2034 | |
b6d7b3d1 JD |
2035 | dev_dbg(&adap->dev, "adapter [%s] registered\n", adap->name); |
2036 | ||
6ada5c1e | 2037 | pm_runtime_no_callbacks(&adap->dev); |
04f59143 | 2038 | pm_suspend_ignore_children(&adap->dev, true); |
9f924169 | 2039 | pm_runtime_enable(&adap->dev); |
6ada5c1e | 2040 | |
2bb5095a JD |
2041 | #ifdef CONFIG_I2C_COMPAT |
2042 | res = class_compat_create_link(i2c_adapter_compat_class, &adap->dev, | |
2043 | adap->dev.parent); | |
2044 | if (res) | |
2045 | dev_warn(&adap->dev, | |
2046 | "Failed to create compatibility class link\n"); | |
2047 | #endif | |
2048 | ||
d3b11d83 | 2049 | i2c_init_recovery(adap); |
5f9296ba | 2050 | |
729d6dd5 | 2051 | /* create pre-declared device nodes */ |
687b81d0 | 2052 | of_i2c_register_devices(adap); |
aec809fc JN |
2053 | i2c_acpi_register_devices(adap); |
2054 | i2c_acpi_install_space_handler(adap); | |
687b81d0 | 2055 | |
6e13e641 DB |
2056 | if (adap->nr < __i2c_first_dynamic_bus_num) |
2057 | i2c_scan_static_board_info(adap); | |
2058 | ||
4735c98f | 2059 | /* Notify drivers */ |
35fc37f8 | 2060 | mutex_lock(&core_lock); |
d6703281 | 2061 | bus_for_each_drv(&i2c_bus_type, NULL, adap, __process_new_adapter); |
caada32a | 2062 | mutex_unlock(&core_lock); |
35fc37f8 JD |
2063 | |
2064 | return 0; | |
b119c6c9 | 2065 | |
b119c6c9 | 2066 | out_list: |
35fc37f8 | 2067 | mutex_lock(&core_lock); |
b119c6c9 | 2068 | idr_remove(&i2c_adapter_idr, adap->nr); |
35fc37f8 JD |
2069 | mutex_unlock(&core_lock); |
2070 | return res; | |
1da177e4 LT |
2071 | } |
2072 | ||
ee5c2744 DA |
2073 | /** |
2074 | * __i2c_add_numbered_adapter - i2c_add_numbered_adapter where nr is never -1 | |
2075 | * @adap: the adapter to register (with adap->nr initialized) | |
2076 | * Context: can sleep | |
2077 | * | |
2078 | * See i2c_add_numbered_adapter() for details. | |
2079 | */ | |
2080 | static int __i2c_add_numbered_adapter(struct i2c_adapter *adap) | |
2081 | { | |
84d0b617 | 2082 | int id; |
ee5c2744 DA |
2083 | |
2084 | mutex_lock(&core_lock); | |
84d0b617 | 2085 | id = idr_alloc(&i2c_adapter_idr, adap, adap->nr, adap->nr + 1, GFP_KERNEL); |
ee5c2744 | 2086 | mutex_unlock(&core_lock); |
84d0b617 | 2087 | if (WARN(id < 0, "couldn't get idr")) |
ee5c2744 DA |
2088 | return id == -ENOSPC ? -EBUSY : id; |
2089 | ||
2090 | return i2c_register_adapter(adap); | |
2091 | } | |
2092 | ||
6e13e641 DB |
2093 | /** |
2094 | * i2c_add_adapter - declare i2c adapter, use dynamic bus number | |
2095 | * @adapter: the adapter to add | |
d64f73be | 2096 | * Context: can sleep |
6e13e641 DB |
2097 | * |
2098 | * This routine is used to declare an I2C adapter when its bus number | |
ee5c2744 DA |
2099 | * doesn't matter or when its bus number is specified by an dt alias. |
2100 | * Examples of bases when the bus number doesn't matter: I2C adapters | |
2101 | * dynamically added by USB links or PCI plugin cards. | |
6e13e641 DB |
2102 | * |
2103 | * When this returns zero, a new bus number was allocated and stored | |
2104 | * in adap->nr, and the specified adapter became available for clients. | |
2105 | * Otherwise, a negative errno value is returned. | |
2106 | */ | |
2107 | int i2c_add_adapter(struct i2c_adapter *adapter) | |
2108 | { | |
ee5c2744 | 2109 | struct device *dev = &adapter->dev; |
4ae42b0f | 2110 | int id; |
6e13e641 | 2111 | |
ee5c2744 DA |
2112 | if (dev->of_node) { |
2113 | id = of_alias_get_id(dev->of_node, "i2c"); | |
2114 | if (id >= 0) { | |
2115 | adapter->nr = id; | |
2116 | return __i2c_add_numbered_adapter(adapter); | |
2117 | } | |
2118 | } | |
2119 | ||
caada32a | 2120 | mutex_lock(&core_lock); |
4ae42b0f TH |
2121 | id = idr_alloc(&i2c_adapter_idr, adapter, |
2122 | __i2c_first_dynamic_bus_num, 0, GFP_KERNEL); | |
caada32a | 2123 | mutex_unlock(&core_lock); |
84d0b617 | 2124 | if (WARN(id < 0, "couldn't get idr")) |
4ae42b0f | 2125 | return id; |
6e13e641 DB |
2126 | |
2127 | adapter->nr = id; | |
4ae42b0f | 2128 | |
6e13e641 DB |
2129 | return i2c_register_adapter(adapter); |
2130 | } | |
2131 | EXPORT_SYMBOL(i2c_add_adapter); | |
2132 | ||
2133 | /** | |
2134 | * i2c_add_numbered_adapter - declare i2c adapter, use static bus number | |
2135 | * @adap: the adapter to register (with adap->nr initialized) | |
d64f73be | 2136 | * Context: can sleep |
6e13e641 DB |
2137 | * |
2138 | * This routine is used to declare an I2C adapter when its bus number | |
8c07e46f RD |
2139 | * matters. For example, use it for I2C adapters from system-on-chip CPUs, |
2140 | * or otherwise built in to the system's mainboard, and where i2c_board_info | |
6e13e641 DB |
2141 | * is used to properly configure I2C devices. |
2142 | * | |
488bf314 GL |
2143 | * If the requested bus number is set to -1, then this function will behave |
2144 | * identically to i2c_add_adapter, and will dynamically assign a bus number. | |
2145 | * | |
6e13e641 DB |
2146 | * If no devices have pre-been declared for this bus, then be sure to |
2147 | * register the adapter before any dynamically allocated ones. Otherwise | |
2148 | * the required bus ID may not be available. | |
2149 | * | |
2150 | * When this returns zero, the specified adapter became available for | |
2151 | * clients using the bus number provided in adap->nr. Also, the table | |
2152 | * of I2C devices pre-declared using i2c_register_board_info() is scanned, | |
2153 | * and the appropriate driver model device nodes are created. Otherwise, a | |
2154 | * negative errno value is returned. | |
2155 | */ | |
2156 | int i2c_add_numbered_adapter(struct i2c_adapter *adap) | |
2157 | { | |
488bf314 GL |
2158 | if (adap->nr == -1) /* -1 means dynamically assign bus id */ |
2159 | return i2c_add_adapter(adap); | |
6e13e641 | 2160 | |
ee5c2744 | 2161 | return __i2c_add_numbered_adapter(adap); |
6e13e641 DB |
2162 | } |
2163 | EXPORT_SYMBOL_GPL(i2c_add_numbered_adapter); | |
2164 | ||
19baba4c | 2165 | static void i2c_do_del_adapter(struct i2c_driver *driver, |
69b0089a | 2166 | struct i2c_adapter *adapter) |
026526f5 | 2167 | { |
4735c98f | 2168 | struct i2c_client *client, *_n; |
026526f5 | 2169 | |
acec211c JD |
2170 | /* Remove the devices we created ourselves as the result of hardware |
2171 | * probing (using a driver's detect method) */ | |
4735c98f JD |
2172 | list_for_each_entry_safe(client, _n, &driver->clients, detected) { |
2173 | if (client->adapter == adapter) { | |
2174 | dev_dbg(&adapter->dev, "Removing %s at 0x%x\n", | |
2175 | client->name, client->addr); | |
2176 | list_del(&client->detected); | |
2177 | i2c_unregister_device(client); | |
2178 | } | |
2179 | } | |
026526f5 JD |
2180 | } |
2181 | ||
e549c2b5 | 2182 | static int __unregister_client(struct device *dev, void *dummy) |
5219bf88 JD |
2183 | { |
2184 | struct i2c_client *client = i2c_verify_client(dev); | |
2185 | if (client && strcmp(client->name, "dummy")) | |
2186 | i2c_unregister_device(client); | |
2187 | return 0; | |
2188 | } | |
2189 | ||
2190 | static int __unregister_dummy(struct device *dev, void *dummy) | |
e549c2b5 JD |
2191 | { |
2192 | struct i2c_client *client = i2c_verify_client(dev); | |
2193 | if (client) | |
2194 | i2c_unregister_device(client); | |
2195 | return 0; | |
2196 | } | |
2197 | ||
69b0089a JD |
2198 | static int __process_removed_adapter(struct device_driver *d, void *data) |
2199 | { | |
19baba4c LPC |
2200 | i2c_do_del_adapter(to_i2c_driver(d), data); |
2201 | return 0; | |
69b0089a JD |
2202 | } |
2203 | ||
d64f73be DB |
2204 | /** |
2205 | * i2c_del_adapter - unregister I2C adapter | |
2206 | * @adap: the adapter being unregistered | |
2207 | * Context: can sleep | |
2208 | * | |
2209 | * This unregisters an I2C adapter which was previously registered | |
2210 | * by @i2c_add_adapter or @i2c_add_numbered_adapter. | |
2211 | */ | |
71546300 | 2212 | void i2c_del_adapter(struct i2c_adapter *adap) |
1da177e4 | 2213 | { |
35fc37f8 | 2214 | struct i2c_adapter *found; |
bbd2d9c9 | 2215 | struct i2c_client *client, *next; |
1da177e4 LT |
2216 | |
2217 | /* First make sure that this adapter was ever added */ | |
35fc37f8 JD |
2218 | mutex_lock(&core_lock); |
2219 | found = idr_find(&i2c_adapter_idr, adap->nr); | |
2220 | mutex_unlock(&core_lock); | |
2221 | if (found != adap) { | |
44239a5a | 2222 | pr_debug("attempting to delete unregistered adapter [%s]\n", adap->name); |
71546300 | 2223 | return; |
1da177e4 LT |
2224 | } |
2225 | ||
aec809fc | 2226 | i2c_acpi_remove_space_handler(adap); |
026526f5 | 2227 | /* Tell drivers about this removal */ |
35fc37f8 | 2228 | mutex_lock(&core_lock); |
19baba4c | 2229 | bus_for_each_drv(&i2c_bus_type, NULL, adap, |
69b0089a | 2230 | __process_removed_adapter); |
35fc37f8 | 2231 | mutex_unlock(&core_lock); |
1da177e4 | 2232 | |
bbd2d9c9 | 2233 | /* Remove devices instantiated from sysfs */ |
390946b1 JD |
2234 | mutex_lock_nested(&adap->userspace_clients_lock, |
2235 | i2c_adapter_depth(adap)); | |
6629dcff JD |
2236 | list_for_each_entry_safe(client, next, &adap->userspace_clients, |
2237 | detected) { | |
2238 | dev_dbg(&adap->dev, "Removing %s at 0x%x\n", client->name, | |
2239 | client->addr); | |
2240 | list_del(&client->detected); | |
2241 | i2c_unregister_device(client); | |
bbd2d9c9 | 2242 | } |
dafc50d1 | 2243 | mutex_unlock(&adap->userspace_clients_lock); |
bbd2d9c9 | 2244 | |
e549c2b5 | 2245 | /* Detach any active clients. This can't fail, thus we do not |
5219bf88 JD |
2246 | * check the returned value. This is a two-pass process, because |
2247 | * we can't remove the dummy devices during the first pass: they | |
2248 | * could have been instantiated by real devices wishing to clean | |
2249 | * them up properly, so we give them a chance to do that first. */ | |
19baba4c LPC |
2250 | device_for_each_child(&adap->dev, NULL, __unregister_client); |
2251 | device_for_each_child(&adap->dev, NULL, __unregister_dummy); | |
1da177e4 | 2252 | |
2bb5095a JD |
2253 | #ifdef CONFIG_I2C_COMPAT |
2254 | class_compat_remove_link(i2c_adapter_compat_class, &adap->dev, | |
2255 | adap->dev.parent); | |
2256 | #endif | |
2257 | ||
c5567521 TLSC |
2258 | /* device name is gone after device_unregister */ |
2259 | dev_dbg(&adap->dev, "adapter [%s] unregistered\n", adap->name); | |
2260 | ||
9f924169 WS |
2261 | pm_runtime_disable(&adap->dev); |
2262 | ||
4d5538f5 BT |
2263 | i2c_host_notify_irq_teardown(adap); |
2264 | ||
26680ee2 WS |
2265 | /* wait until all references to the device are gone |
2266 | * | |
2267 | * FIXME: This is old code and should ideally be replaced by an | |
2268 | * alternative which results in decoupling the lifetime of the struct | |
2269 | * device from the i2c_adapter, like spi or netdev do. Any solution | |
95cc1e3d | 2270 | * should be thoroughly tested with DEBUG_KOBJECT_RELEASE enabled! |
26680ee2 | 2271 | */ |
1da177e4 | 2272 | init_completion(&adap->dev_released); |
1da177e4 | 2273 | device_unregister(&adap->dev); |
1da177e4 | 2274 | wait_for_completion(&adap->dev_released); |
1da177e4 | 2275 | |
6e13e641 | 2276 | /* free bus id */ |
35fc37f8 | 2277 | mutex_lock(&core_lock); |
1da177e4 | 2278 | idr_remove(&i2c_adapter_idr, adap->nr); |
35fc37f8 | 2279 | mutex_unlock(&core_lock); |
1da177e4 | 2280 | |
bd4bc3db JD |
2281 | /* Clear the device structure in case this adapter is ever going to be |
2282 | added again */ | |
2283 | memset(&adap->dev, 0, sizeof(adap->dev)); | |
1da177e4 | 2284 | } |
c0564606 | 2285 | EXPORT_SYMBOL(i2c_del_adapter); |
1da177e4 | 2286 | |
54177ccf WS |
2287 | /** |
2288 | * i2c_parse_fw_timings - get I2C related timing parameters from firmware | |
2289 | * @dev: The device to scan for I2C timing properties | |
2290 | * @t: the i2c_timings struct to be filled with values | |
2291 | * @use_defaults: bool to use sane defaults derived from the I2C specification | |
2292 | * when properties are not found, otherwise use 0 | |
2293 | * | |
2294 | * Scan the device for the generic I2C properties describing timing parameters | |
2295 | * for the signal and fill the given struct with the results. If a property was | |
2296 | * not found and use_defaults was true, then maximum timings are assumed which | |
2297 | * are derived from the I2C specification. If use_defaults is not used, the | |
2298 | * results will be 0, so drivers can apply their own defaults later. The latter | |
2299 | * is mainly intended for avoiding regressions of existing drivers which want | |
2300 | * to switch to this function. New drivers almost always should use the defaults. | |
2301 | */ | |
2302 | ||
2303 | void i2c_parse_fw_timings(struct device *dev, struct i2c_timings *t, bool use_defaults) | |
2304 | { | |
2305 | int ret; | |
2306 | ||
2307 | memset(t, 0, sizeof(*t)); | |
2308 | ||
2309 | ret = device_property_read_u32(dev, "clock-frequency", &t->bus_freq_hz); | |
2310 | if (ret && use_defaults) | |
2311 | t->bus_freq_hz = 100000; | |
2312 | ||
2313 | ret = device_property_read_u32(dev, "i2c-scl-rising-time-ns", &t->scl_rise_ns); | |
2314 | if (ret && use_defaults) { | |
2315 | if (t->bus_freq_hz <= 100000) | |
2316 | t->scl_rise_ns = 1000; | |
2317 | else if (t->bus_freq_hz <= 400000) | |
2318 | t->scl_rise_ns = 300; | |
2319 | else | |
2320 | t->scl_rise_ns = 120; | |
2321 | } | |
2322 | ||
2323 | ret = device_property_read_u32(dev, "i2c-scl-falling-time-ns", &t->scl_fall_ns); | |
2324 | if (ret && use_defaults) { | |
2325 | if (t->bus_freq_hz <= 400000) | |
2326 | t->scl_fall_ns = 300; | |
2327 | else | |
2328 | t->scl_fall_ns = 120; | |
2329 | } | |
2330 | ||
2331 | device_property_read_u32(dev, "i2c-scl-internal-delay-ns", &t->scl_int_delay_ns); | |
2332 | ||
2333 | ret = device_property_read_u32(dev, "i2c-sda-falling-time-ns", &t->sda_fall_ns); | |
2334 | if (ret && use_defaults) | |
2335 | t->sda_fall_ns = t->scl_fall_ns; | |
2336 | } | |
2337 | EXPORT_SYMBOL_GPL(i2c_parse_fw_timings); | |
2338 | ||
7b4fbc50 DB |
2339 | /* ------------------------------------------------------------------------- */ |
2340 | ||
7ae31482 JD |
2341 | int i2c_for_each_dev(void *data, int (*fn)(struct device *, void *)) |
2342 | { | |
2343 | int res; | |
2344 | ||
2345 | mutex_lock(&core_lock); | |
2346 | res = bus_for_each_dev(&i2c_bus_type, NULL, data, fn); | |
2347 | mutex_unlock(&core_lock); | |
2348 | ||
2349 | return res; | |
2350 | } | |
2351 | EXPORT_SYMBOL_GPL(i2c_for_each_dev); | |
2352 | ||
69b0089a | 2353 | static int __process_new_driver(struct device *dev, void *data) |
7f101a97 | 2354 | { |
4f8cf824 JD |
2355 | if (dev->type != &i2c_adapter_type) |
2356 | return 0; | |
69b0089a | 2357 | return i2c_do_add_adapter(data, to_i2c_adapter(dev)); |
7f101a97 DY |
2358 | } |
2359 | ||
7b4fbc50 DB |
2360 | /* |
2361 | * An i2c_driver is used with one or more i2c_client (device) nodes to access | |
729d6dd5 | 2362 | * i2c slave chips, on a bus instance associated with some i2c_adapter. |
1da177e4 LT |
2363 | */ |
2364 | ||
de59cf9e | 2365 | int i2c_register_driver(struct module *owner, struct i2c_driver *driver) |
1da177e4 | 2366 | { |
7eebcb7c | 2367 | int res; |
1da177e4 | 2368 | |
1d0b19c9 | 2369 | /* Can't register until after driver model init */ |
95026658 | 2370 | if (WARN_ON(!is_registered)) |
1d0b19c9 DB |
2371 | return -EAGAIN; |
2372 | ||
1da177e4 | 2373 | /* add the driver to the list of i2c drivers in the driver core */ |
de59cf9e | 2374 | driver->driver.owner = owner; |
1da177e4 | 2375 | driver->driver.bus = &i2c_bus_type; |
147b36d5 | 2376 | INIT_LIST_HEAD(&driver->clients); |
1da177e4 | 2377 | |
729d6dd5 | 2378 | /* When registration returns, the driver core |
6e13e641 DB |
2379 | * will have called probe() for all matching-but-unbound devices. |
2380 | */ | |
1da177e4 LT |
2381 | res = driver_register(&driver->driver); |
2382 | if (res) | |
7eebcb7c | 2383 | return res; |
438d6c2c | 2384 | |
44239a5a | 2385 | pr_debug("driver [%s] registered\n", driver->driver.name); |
1da177e4 | 2386 | |
4735c98f | 2387 | /* Walk the adapters that are already present */ |
7ae31482 | 2388 | i2c_for_each_dev(driver, __process_new_driver); |
35fc37f8 | 2389 | |
7f101a97 DY |
2390 | return 0; |
2391 | } | |
2392 | EXPORT_SYMBOL(i2c_register_driver); | |
2393 | ||
69b0089a | 2394 | static int __process_removed_driver(struct device *dev, void *data) |
7f101a97 | 2395 | { |
19baba4c LPC |
2396 | if (dev->type == &i2c_adapter_type) |
2397 | i2c_do_del_adapter(data, to_i2c_adapter(dev)); | |
2398 | return 0; | |
1da177e4 LT |
2399 | } |
2400 | ||
a1d9e6e4 DB |
2401 | /** |
2402 | * i2c_del_driver - unregister I2C driver | |
2403 | * @driver: the driver being unregistered | |
d64f73be | 2404 | * Context: can sleep |
a1d9e6e4 | 2405 | */ |
b3e82096 | 2406 | void i2c_del_driver(struct i2c_driver *driver) |
1da177e4 | 2407 | { |
7ae31482 | 2408 | i2c_for_each_dev(driver, __process_removed_driver); |
1da177e4 LT |
2409 | |
2410 | driver_unregister(&driver->driver); | |
44239a5a | 2411 | pr_debug("driver [%s] unregistered\n", driver->driver.name); |
1da177e4 | 2412 | } |
c0564606 | 2413 | EXPORT_SYMBOL(i2c_del_driver); |
1da177e4 | 2414 | |
7b4fbc50 DB |
2415 | /* ------------------------------------------------------------------------- */ |
2416 | ||
e48d3319 JD |
2417 | /** |
2418 | * i2c_use_client - increments the reference count of the i2c client structure | |
2419 | * @client: the client being referenced | |
2420 | * | |
2421 | * Each live reference to a client should be refcounted. The driver model does | |
2422 | * that automatically as part of driver binding, so that most drivers don't | |
2423 | * need to do this explicitly: they hold a reference until they're unbound | |
2424 | * from the device. | |
2425 | * | |
2426 | * A pointer to the client with the incremented reference counter is returned. | |
2427 | */ | |
2428 | struct i2c_client *i2c_use_client(struct i2c_client *client) | |
1da177e4 | 2429 | { |
6ea438ec DB |
2430 | if (client && get_device(&client->dev)) |
2431 | return client; | |
2432 | return NULL; | |
1da177e4 | 2433 | } |
c0564606 | 2434 | EXPORT_SYMBOL(i2c_use_client); |
1da177e4 | 2435 | |
e48d3319 JD |
2436 | /** |
2437 | * i2c_release_client - release a use of the i2c client structure | |
2438 | * @client: the client being no longer referenced | |
2439 | * | |
2440 | * Must be called when a user of a client is finished with it. | |
2441 | */ | |
2442 | void i2c_release_client(struct i2c_client *client) | |
1da177e4 | 2443 | { |
6ea438ec DB |
2444 | if (client) |
2445 | put_device(&client->dev); | |
1da177e4 | 2446 | } |
c0564606 | 2447 | EXPORT_SYMBOL(i2c_release_client); |
1da177e4 | 2448 | |
9b766b81 DB |
2449 | struct i2c_cmd_arg { |
2450 | unsigned cmd; | |
2451 | void *arg; | |
2452 | }; | |
2453 | ||
2454 | static int i2c_cmd(struct device *dev, void *_arg) | |
2455 | { | |
2456 | struct i2c_client *client = i2c_verify_client(dev); | |
2457 | struct i2c_cmd_arg *arg = _arg; | |
0acc2b32 LPC |
2458 | struct i2c_driver *driver; |
2459 | ||
2460 | if (!client || !client->dev.driver) | |
2461 | return 0; | |
9b766b81 | 2462 | |
0acc2b32 LPC |
2463 | driver = to_i2c_driver(client->dev.driver); |
2464 | if (driver->command) | |
2465 | driver->command(client, arg->cmd, arg->arg); | |
9b766b81 DB |
2466 | return 0; |
2467 | } | |
2468 | ||
1da177e4 LT |
2469 | void i2c_clients_command(struct i2c_adapter *adap, unsigned int cmd, void *arg) |
2470 | { | |
9b766b81 | 2471 | struct i2c_cmd_arg cmd_arg; |
1da177e4 | 2472 | |
9b766b81 DB |
2473 | cmd_arg.cmd = cmd; |
2474 | cmd_arg.arg = arg; | |
2475 | device_for_each_child(&adap->dev, &cmd_arg, i2c_cmd); | |
1da177e4 | 2476 | } |
c0564606 | 2477 | EXPORT_SYMBOL(i2c_clients_command); |
1da177e4 | 2478 | |
ea7513bb PA |
2479 | #if IS_ENABLED(CONFIG_OF_DYNAMIC) |
2480 | static int of_i2c_notify(struct notifier_block *nb, unsigned long action, | |
2481 | void *arg) | |
2482 | { | |
2483 | struct of_reconfig_data *rd = arg; | |
2484 | struct i2c_adapter *adap; | |
2485 | struct i2c_client *client; | |
2486 | ||
2487 | switch (of_reconfig_get_state_change(action, rd)) { | |
2488 | case OF_RECONFIG_CHANGE_ADD: | |
2489 | adap = of_find_i2c_adapter_by_node(rd->dn->parent); | |
2490 | if (adap == NULL) | |
2491 | return NOTIFY_OK; /* not for us */ | |
2492 | ||
4f001fd3 PA |
2493 | if (of_node_test_and_set_flag(rd->dn, OF_POPULATED)) { |
2494 | put_device(&adap->dev); | |
2495 | return NOTIFY_OK; | |
2496 | } | |
2497 | ||
ea7513bb PA |
2498 | client = of_i2c_register_device(adap, rd->dn); |
2499 | put_device(&adap->dev); | |
2500 | ||
2501 | if (IS_ERR(client)) { | |
399d62ac WS |
2502 | dev_err(&adap->dev, "failed to create client for '%s'\n", |
2503 | rd->dn->full_name); | |
6a676fb6 | 2504 | of_node_clear_flag(rd->dn, OF_POPULATED); |
ea7513bb PA |
2505 | return notifier_from_errno(PTR_ERR(client)); |
2506 | } | |
2507 | break; | |
2508 | case OF_RECONFIG_CHANGE_REMOVE: | |
4f001fd3 PA |
2509 | /* already depopulated? */ |
2510 | if (!of_node_check_flag(rd->dn, OF_POPULATED)) | |
2511 | return NOTIFY_OK; | |
2512 | ||
ea7513bb PA |
2513 | /* find our device by node */ |
2514 | client = of_find_i2c_device_by_node(rd->dn); | |
2515 | if (client == NULL) | |
2516 | return NOTIFY_OK; /* no? not meant for us */ | |
2517 | ||
2518 | /* unregister takes one ref away */ | |
2519 | i2c_unregister_device(client); | |
2520 | ||
2521 | /* and put the reference of the find */ | |
2522 | put_device(&client->dev); | |
2523 | break; | |
2524 | } | |
2525 | ||
2526 | return NOTIFY_OK; | |
2527 | } | |
2528 | static struct notifier_block i2c_of_notifier = { | |
2529 | .notifier_call = of_i2c_notify, | |
2530 | }; | |
2531 | #else | |
2532 | extern struct notifier_block i2c_of_notifier; | |
2533 | #endif /* CONFIG_OF_DYNAMIC */ | |
2534 | ||
1da177e4 LT |
2535 | static int __init i2c_init(void) |
2536 | { | |
2537 | int retval; | |
2538 | ||
03bde7c3 WS |
2539 | retval = of_alias_get_highest_id("i2c"); |
2540 | ||
2541 | down_write(&__i2c_board_lock); | |
2542 | if (retval >= __i2c_first_dynamic_bus_num) | |
2543 | __i2c_first_dynamic_bus_num = retval + 1; | |
2544 | up_write(&__i2c_board_lock); | |
2545 | ||
1da177e4 | 2546 | retval = bus_register(&i2c_bus_type); |
1da177e4 LT |
2547 | if (retval) |
2548 | return retval; | |
b980a26d WS |
2549 | |
2550 | is_registered = true; | |
2551 | ||
2bb5095a JD |
2552 | #ifdef CONFIG_I2C_COMPAT |
2553 | i2c_adapter_compat_class = class_compat_register("i2c-adapter"); | |
2554 | if (!i2c_adapter_compat_class) { | |
2555 | retval = -ENOMEM; | |
2556 | goto bus_err; | |
2557 | } | |
2558 | #endif | |
e9f1373b DB |
2559 | retval = i2c_add_driver(&dummy_driver); |
2560 | if (retval) | |
2bb5095a | 2561 | goto class_err; |
ea7513bb PA |
2562 | |
2563 | if (IS_ENABLED(CONFIG_OF_DYNAMIC)) | |
2564 | WARN_ON(of_reconfig_notifier_register(&i2c_of_notifier)); | |
525e6fab OP |
2565 | if (IS_ENABLED(CONFIG_ACPI)) |
2566 | WARN_ON(acpi_reconfig_notifier_register(&i2c_acpi_notifier)); | |
ea7513bb | 2567 | |
e9f1373b DB |
2568 | return 0; |
2569 | ||
2bb5095a JD |
2570 | class_err: |
2571 | #ifdef CONFIG_I2C_COMPAT | |
2572 | class_compat_unregister(i2c_adapter_compat_class); | |
e9f1373b | 2573 | bus_err: |
2bb5095a | 2574 | #endif |
b980a26d | 2575 | is_registered = false; |
e9f1373b DB |
2576 | bus_unregister(&i2c_bus_type); |
2577 | return retval; | |
1da177e4 LT |
2578 | } |
2579 | ||
2580 | static void __exit i2c_exit(void) | |
2581 | { | |
525e6fab OP |
2582 | if (IS_ENABLED(CONFIG_ACPI)) |
2583 | WARN_ON(acpi_reconfig_notifier_unregister(&i2c_acpi_notifier)); | |
ea7513bb PA |
2584 | if (IS_ENABLED(CONFIG_OF_DYNAMIC)) |
2585 | WARN_ON(of_reconfig_notifier_unregister(&i2c_of_notifier)); | |
e9f1373b | 2586 | i2c_del_driver(&dummy_driver); |
2bb5095a JD |
2587 | #ifdef CONFIG_I2C_COMPAT |
2588 | class_compat_unregister(i2c_adapter_compat_class); | |
2589 | #endif | |
1da177e4 | 2590 | bus_unregister(&i2c_bus_type); |
d9a83d62 | 2591 | tracepoint_synchronize_unregister(); |
1da177e4 LT |
2592 | } |
2593 | ||
a10f9e7c DB |
2594 | /* We must initialize early, because some subsystems register i2c drivers |
2595 | * in subsys_initcall() code, but are linked (and initialized) before i2c. | |
2596 | */ | |
2597 | postcore_initcall(i2c_init); | |
1da177e4 LT |
2598 | module_exit(i2c_exit); |
2599 | ||
2600 | /* ---------------------------------------------------- | |
2601 | * the functional interface to the i2c busses. | |
2602 | * ---------------------------------------------------- | |
2603 | */ | |
2604 | ||
b7f62584 WS |
2605 | /* Check if val is exceeding the quirk IFF quirk is non 0 */ |
2606 | #define i2c_quirk_exceeded(val, quirk) ((quirk) && ((val) > (quirk))) | |
2607 | ||
2608 | static int i2c_quirk_error(struct i2c_adapter *adap, struct i2c_msg *msg, char *err_msg) | |
2609 | { | |
2610 | dev_err_ratelimited(&adap->dev, "adapter quirk: %s (addr 0x%04x, size %u, %s)\n", | |
2611 | err_msg, msg->addr, msg->len, | |
2612 | msg->flags & I2C_M_RD ? "read" : "write"); | |
2613 | return -EOPNOTSUPP; | |
2614 | } | |
2615 | ||
2616 | static int i2c_check_for_quirks(struct i2c_adapter *adap, struct i2c_msg *msgs, int num) | |
2617 | { | |
2618 | const struct i2c_adapter_quirks *q = adap->quirks; | |
2619 | int max_num = q->max_num_msgs, i; | |
2620 | bool do_len_check = true; | |
2621 | ||
2622 | if (q->flags & I2C_AQ_COMB) { | |
2623 | max_num = 2; | |
2624 | ||
2625 | /* special checks for combined messages */ | |
2626 | if (num == 2) { | |
2627 | if (q->flags & I2C_AQ_COMB_WRITE_FIRST && msgs[0].flags & I2C_M_RD) | |
2628 | return i2c_quirk_error(adap, &msgs[0], "1st comb msg must be write"); | |
2629 | ||
2630 | if (q->flags & I2C_AQ_COMB_READ_SECOND && !(msgs[1].flags & I2C_M_RD)) | |
2631 | return i2c_quirk_error(adap, &msgs[1], "2nd comb msg must be read"); | |
2632 | ||
2633 | if (q->flags & I2C_AQ_COMB_SAME_ADDR && msgs[0].addr != msgs[1].addr) | |
2634 | return i2c_quirk_error(adap, &msgs[0], "comb msg only to same addr"); | |
2635 | ||
2636 | if (i2c_quirk_exceeded(msgs[0].len, q->max_comb_1st_msg_len)) | |
2637 | return i2c_quirk_error(adap, &msgs[0], "msg too long"); | |
2638 | ||
2639 | if (i2c_quirk_exceeded(msgs[1].len, q->max_comb_2nd_msg_len)) | |
2640 | return i2c_quirk_error(adap, &msgs[1], "msg too long"); | |
2641 | ||
2642 | do_len_check = false; | |
2643 | } | |
2644 | } | |
2645 | ||
2646 | if (i2c_quirk_exceeded(num, max_num)) | |
2647 | return i2c_quirk_error(adap, &msgs[0], "too many messages"); | |
2648 | ||
2649 | for (i = 0; i < num; i++) { | |
2650 | u16 len = msgs[i].len; | |
2651 | ||
2652 | if (msgs[i].flags & I2C_M_RD) { | |
2653 | if (do_len_check && i2c_quirk_exceeded(len, q->max_read_len)) | |
2654 | return i2c_quirk_error(adap, &msgs[i], "msg too long"); | |
2655 | } else { | |
2656 | if (do_len_check && i2c_quirk_exceeded(len, q->max_write_len)) | |
2657 | return i2c_quirk_error(adap, &msgs[i], "msg too long"); | |
2658 | } | |
2659 | } | |
2660 | ||
2661 | return 0; | |
2662 | } | |
2663 | ||
b37d2a3a JD |
2664 | /** |
2665 | * __i2c_transfer - unlocked flavor of i2c_transfer | |
2666 | * @adap: Handle to I2C bus | |
2667 | * @msgs: One or more messages to execute before STOP is issued to | |
2668 | * terminate the operation; each message begins with a START. | |
2669 | * @num: Number of messages to be executed. | |
2670 | * | |
2671 | * Returns negative errno, else the number of messages executed. | |
2672 | * | |
2673 | * Adapter lock must be held when calling this function. No debug logging | |
2674 | * takes place. adap->algo->master_xfer existence isn't checked. | |
2675 | */ | |
2676 | int __i2c_transfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num) | |
2677 | { | |
2678 | unsigned long orig_jiffies; | |
2679 | int ret, try; | |
2680 | ||
b7f62584 WS |
2681 | if (adap->quirks && i2c_check_for_quirks(adap, msgs, num)) |
2682 | return -EOPNOTSUPP; | |
2683 | ||
d9a83d62 DH |
2684 | /* i2c_trace_msg gets enabled when tracepoint i2c_transfer gets |
2685 | * enabled. This is an efficient way of keeping the for-loop from | |
2686 | * being executed when not needed. | |
2687 | */ | |
2688 | if (static_key_false(&i2c_trace_msg)) { | |
2689 | int i; | |
2690 | for (i = 0; i < num; i++) | |
2691 | if (msgs[i].flags & I2C_M_RD) | |
2692 | trace_i2c_read(adap, &msgs[i], i); | |
2693 | else | |
2694 | trace_i2c_write(adap, &msgs[i], i); | |
2695 | } | |
2696 | ||
b37d2a3a JD |
2697 | /* Retry automatically on arbitration loss */ |
2698 | orig_jiffies = jiffies; | |
2699 | for (ret = 0, try = 0; try <= adap->retries; try++) { | |
2700 | ret = adap->algo->master_xfer(adap, msgs, num); | |
2701 | if (ret != -EAGAIN) | |
2702 | break; | |
2703 | if (time_after(jiffies, orig_jiffies + adap->timeout)) | |
2704 | break; | |
2705 | } | |
2706 | ||
d9a83d62 DH |
2707 | if (static_key_false(&i2c_trace_msg)) { |
2708 | int i; | |
2709 | for (i = 0; i < ret; i++) | |
2710 | if (msgs[i].flags & I2C_M_RD) | |
2711 | trace_i2c_reply(adap, &msgs[i], i); | |
2712 | trace_i2c_result(adap, i, ret); | |
2713 | } | |
2714 | ||
b37d2a3a JD |
2715 | return ret; |
2716 | } | |
2717 | EXPORT_SYMBOL(__i2c_transfer); | |
2718 | ||
a1cdedac DB |
2719 | /** |
2720 | * i2c_transfer - execute a single or combined I2C message | |
2721 | * @adap: Handle to I2C bus | |
2722 | * @msgs: One or more messages to execute before STOP is issued to | |
2723 | * terminate the operation; each message begins with a START. | |
2724 | * @num: Number of messages to be executed. | |
2725 | * | |
2726 | * Returns negative errno, else the number of messages executed. | |
2727 | * | |
2728 | * Note that there is no requirement that each message be sent to | |
2729 | * the same slave address, although that is the most common model. | |
2730 | */ | |
09b8ce0a | 2731 | int i2c_transfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num) |
1da177e4 | 2732 | { |
b37d2a3a | 2733 | int ret; |
1da177e4 | 2734 | |
a1cdedac DB |
2735 | /* REVISIT the fault reporting model here is weak: |
2736 | * | |
2737 | * - When we get an error after receiving N bytes from a slave, | |
2738 | * there is no way to report "N". | |
2739 | * | |
2740 | * - When we get a NAK after transmitting N bytes to a slave, | |
2741 | * there is no way to report "N" ... or to let the master | |
2742 | * continue executing the rest of this combined message, if | |
2743 | * that's the appropriate response. | |
2744 | * | |
2745 | * - When for example "num" is two and we successfully complete | |
2746 | * the first message but get an error part way through the | |
2747 | * second, it's unclear whether that should be reported as | |
2748 | * one (discarding status on the second message) or errno | |
2749 | * (discarding status on the first one). | |
2750 | */ | |
2751 | ||
1da177e4 LT |
2752 | if (adap->algo->master_xfer) { |
2753 | #ifdef DEBUG | |
2754 | for (ret = 0; ret < num; ret++) { | |
b93d3d37 AS |
2755 | dev_dbg(&adap->dev, |
2756 | "master_xfer[%d] %c, addr=0x%02x, len=%d%s\n", | |
2757 | ret, (msgs[ret].flags & I2C_M_RD) ? 'R' : 'W', | |
2758 | msgs[ret].addr, msgs[ret].len, | |
209d27c3 | 2759 | (msgs[ret].flags & I2C_M_RECV_LEN) ? "+" : ""); |
1da177e4 LT |
2760 | } |
2761 | #endif | |
2762 | ||
cea443a8 | 2763 | if (in_atomic() || irqs_disabled()) { |
fb79e09a | 2764 | ret = i2c_trylock_bus(adap, I2C_LOCK_SEGMENT); |
cea443a8 MR |
2765 | if (!ret) |
2766 | /* I2C activity is ongoing. */ | |
2767 | return -EAGAIN; | |
2768 | } else { | |
8320f495 | 2769 | i2c_lock_bus(adap, I2C_LOCK_SEGMENT); |
cea443a8 MR |
2770 | } |
2771 | ||
b37d2a3a | 2772 | ret = __i2c_transfer(adap, msgs, num); |
8320f495 | 2773 | i2c_unlock_bus(adap, I2C_LOCK_SEGMENT); |
1da177e4 LT |
2774 | |
2775 | return ret; | |
2776 | } else { | |
2777 | dev_dbg(&adap->dev, "I2C level transfers not supported\n"); | |
24a5bb7b | 2778 | return -EOPNOTSUPP; |
1da177e4 LT |
2779 | } |
2780 | } | |
c0564606 | 2781 | EXPORT_SYMBOL(i2c_transfer); |
1da177e4 | 2782 | |
a1cdedac DB |
2783 | /** |
2784 | * i2c_master_send - issue a single I2C message in master transmit mode | |
2785 | * @client: Handle to slave device | |
2786 | * @buf: Data that will be written to the slave | |
0c43ea54 | 2787 | * @count: How many bytes to write, must be less than 64k since msg.len is u16 |
a1cdedac DB |
2788 | * |
2789 | * Returns negative errno, or else the number of bytes written. | |
2790 | */ | |
0cc43a18 | 2791 | int i2c_master_send(const struct i2c_client *client, const char *buf, int count) |
1da177e4 LT |
2792 | { |
2793 | int ret; | |
7225acf4 | 2794 | struct i2c_adapter *adap = client->adapter; |
1da177e4 LT |
2795 | struct i2c_msg msg; |
2796 | ||
815f55f2 JD |
2797 | msg.addr = client->addr; |
2798 | msg.flags = client->flags & I2C_M_TEN; | |
2799 | msg.len = count; | |
2800 | msg.buf = (char *)buf; | |
438d6c2c | 2801 | |
815f55f2 | 2802 | ret = i2c_transfer(adap, &msg, 1); |
1da177e4 | 2803 | |
834aa6f3 WS |
2804 | /* |
2805 | * If everything went ok (i.e. 1 msg transmitted), return #bytes | |
2806 | * transmitted, else error code. | |
2807 | */ | |
815f55f2 | 2808 | return (ret == 1) ? count : ret; |
1da177e4 | 2809 | } |
c0564606 | 2810 | EXPORT_SYMBOL(i2c_master_send); |
1da177e4 | 2811 | |
a1cdedac DB |
2812 | /** |
2813 | * i2c_master_recv - issue a single I2C message in master receive mode | |
2814 | * @client: Handle to slave device | |
2815 | * @buf: Where to store data read from slave | |
0c43ea54 | 2816 | * @count: How many bytes to read, must be less than 64k since msg.len is u16 |
a1cdedac DB |
2817 | * |
2818 | * Returns negative errno, or else the number of bytes read. | |
2819 | */ | |
0cc43a18 | 2820 | int i2c_master_recv(const struct i2c_client *client, char *buf, int count) |
1da177e4 | 2821 | { |
7225acf4 | 2822 | struct i2c_adapter *adap = client->adapter; |
1da177e4 LT |
2823 | struct i2c_msg msg; |
2824 | int ret; | |
815f55f2 JD |
2825 | |
2826 | msg.addr = client->addr; | |
2827 | msg.flags = client->flags & I2C_M_TEN; | |
2828 | msg.flags |= I2C_M_RD; | |
2829 | msg.len = count; | |
2830 | msg.buf = buf; | |
2831 | ||
2832 | ret = i2c_transfer(adap, &msg, 1); | |
2833 | ||
834aa6f3 WS |
2834 | /* |
2835 | * If everything went ok (i.e. 1 msg received), return #bytes received, | |
2836 | * else error code. | |
2837 | */ | |
815f55f2 | 2838 | return (ret == 1) ? count : ret; |
1da177e4 | 2839 | } |
c0564606 | 2840 | EXPORT_SYMBOL(i2c_master_recv); |
1da177e4 | 2841 | |
1da177e4 LT |
2842 | /* ---------------------------------------------------- |
2843 | * the i2c address scanning function | |
2844 | * Will not work for 10-bit addresses! | |
2845 | * ---------------------------------------------------- | |
2846 | */ | |
1da177e4 | 2847 | |
63e4e802 JD |
2848 | /* |
2849 | * Legacy default probe function, mostly relevant for SMBus. The default | |
2850 | * probe method is a quick write, but it is known to corrupt the 24RF08 | |
2851 | * EEPROMs due to a state machine bug, and could also irreversibly | |
2852 | * write-protect some EEPROMs, so for address ranges 0x30-0x37 and 0x50-0x5f, | |
2853 | * we use a short byte read instead. Also, some bus drivers don't implement | |
2854 | * quick write, so we fallback to a byte read in that case too. | |
2855 | * On x86, there is another special case for FSC hardware monitoring chips, | |
2856 | * which want regular byte reads (address 0x73.) Fortunately, these are the | |
2857 | * only known chips using this I2C address on PC hardware. | |
2858 | * Returns 1 if probe succeeded, 0 if not. | |
2859 | */ | |
2860 | static int i2c_default_probe(struct i2c_adapter *adap, unsigned short addr) | |
2861 | { | |
2862 | int err; | |
2863 | union i2c_smbus_data dummy; | |
2864 | ||
2865 | #ifdef CONFIG_X86 | |
2866 | if (addr == 0x73 && (adap->class & I2C_CLASS_HWMON) | |
2867 | && i2c_check_functionality(adap, I2C_FUNC_SMBUS_READ_BYTE_DATA)) | |
2868 | err = i2c_smbus_xfer(adap, addr, 0, I2C_SMBUS_READ, 0, | |
2869 | I2C_SMBUS_BYTE_DATA, &dummy); | |
2870 | else | |
2871 | #endif | |
8031d79b JD |
2872 | if (!((addr & ~0x07) == 0x30 || (addr & ~0x0f) == 0x50) |
2873 | && i2c_check_functionality(adap, I2C_FUNC_SMBUS_QUICK)) | |
63e4e802 JD |
2874 | err = i2c_smbus_xfer(adap, addr, 0, I2C_SMBUS_WRITE, 0, |
2875 | I2C_SMBUS_QUICK, NULL); | |
8031d79b JD |
2876 | else if (i2c_check_functionality(adap, I2C_FUNC_SMBUS_READ_BYTE)) |
2877 | err = i2c_smbus_xfer(adap, addr, 0, I2C_SMBUS_READ, 0, | |
2878 | I2C_SMBUS_BYTE, &dummy); | |
2879 | else { | |
d63a9e85 AL |
2880 | dev_warn(&adap->dev, "No suitable probing method supported for address 0x%02X\n", |
2881 | addr); | |
8031d79b JD |
2882 | err = -EOPNOTSUPP; |
2883 | } | |
63e4e802 JD |
2884 | |
2885 | return err >= 0; | |
2886 | } | |
2887 | ||
ccfbbd08 | 2888 | static int i2c_detect_address(struct i2c_client *temp_client, |
4735c98f JD |
2889 | struct i2c_driver *driver) |
2890 | { | |
2891 | struct i2c_board_info info; | |
2892 | struct i2c_adapter *adapter = temp_client->adapter; | |
2893 | int addr = temp_client->addr; | |
2894 | int err; | |
2895 | ||
2896 | /* Make sure the address is valid */ | |
66be6056 | 2897 | err = i2c_check_7bit_addr_validity_strict(addr); |
656b8761 | 2898 | if (err) { |
4735c98f JD |
2899 | dev_warn(&adapter->dev, "Invalid probe address 0x%02x\n", |
2900 | addr); | |
656b8761 | 2901 | return err; |
4735c98f JD |
2902 | } |
2903 | ||
9bccc70a | 2904 | /* Skip if already in use (7 bit, no need to encode flags) */ |
3b5f794b | 2905 | if (i2c_check_addr_busy(adapter, addr)) |
4735c98f JD |
2906 | return 0; |
2907 | ||
ccfbbd08 | 2908 | /* Make sure there is something at this address */ |
63e4e802 JD |
2909 | if (!i2c_default_probe(adapter, addr)) |
2910 | return 0; | |
4735c98f JD |
2911 | |
2912 | /* Finally call the custom detection function */ | |
2913 | memset(&info, 0, sizeof(struct i2c_board_info)); | |
2914 | info.addr = addr; | |
310ec792 | 2915 | err = driver->detect(temp_client, &info); |
4735c98f JD |
2916 | if (err) { |
2917 | /* -ENODEV is returned if the detection fails. We catch it | |
2918 | here as this isn't an error. */ | |
2919 | return err == -ENODEV ? 0 : err; | |
2920 | } | |
2921 | ||
2922 | /* Consistency check */ | |
2923 | if (info.type[0] == '\0') { | |
b93d3d37 AS |
2924 | dev_err(&adapter->dev, |
2925 | "%s detection function provided no name for 0x%x\n", | |
2926 | driver->driver.name, addr); | |
4735c98f JD |
2927 | } else { |
2928 | struct i2c_client *client; | |
2929 | ||
2930 | /* Detection succeeded, instantiate the device */ | |
0c176170 WS |
2931 | if (adapter->class & I2C_CLASS_DEPRECATED) |
2932 | dev_warn(&adapter->dev, | |
2933 | "This adapter will soon drop class based instantiation of devices. " | |
2934 | "Please make sure client 0x%02x gets instantiated by other means. " | |
2935 | "Check 'Documentation/i2c/instantiating-devices' for details.\n", | |
2936 | info.addr); | |
2937 | ||
4735c98f JD |
2938 | dev_dbg(&adapter->dev, "Creating %s at 0x%02x\n", |
2939 | info.type, info.addr); | |
2940 | client = i2c_new_device(adapter, &info); | |
2941 | if (client) | |
2942 | list_add_tail(&client->detected, &driver->clients); | |
2943 | else | |
2944 | dev_err(&adapter->dev, "Failed creating %s at 0x%02x\n", | |
2945 | info.type, info.addr); | |
2946 | } | |
2947 | return 0; | |
2948 | } | |
2949 | ||
2950 | static int i2c_detect(struct i2c_adapter *adapter, struct i2c_driver *driver) | |
2951 | { | |
c3813d6a | 2952 | const unsigned short *address_list; |
4735c98f JD |
2953 | struct i2c_client *temp_client; |
2954 | int i, err = 0; | |
2955 | int adap_id = i2c_adapter_id(adapter); | |
2956 | ||
c3813d6a JD |
2957 | address_list = driver->address_list; |
2958 | if (!driver->detect || !address_list) | |
4735c98f JD |
2959 | return 0; |
2960 | ||
45552272 WS |
2961 | /* Warn that the adapter lost class based instantiation */ |
2962 | if (adapter->class == I2C_CLASS_DEPRECATED) { | |
2963 | dev_dbg(&adapter->dev, | |
b93d3d37 AS |
2964 | "This adapter dropped support for I2C classes and won't auto-detect %s devices anymore. " |
2965 | "If you need it, check 'Documentation/i2c/instantiating-devices' for alternatives.\n", | |
45552272 WS |
2966 | driver->driver.name); |
2967 | return 0; | |
2968 | } | |
2969 | ||
51b54ba9 JD |
2970 | /* Stop here if the classes do not match */ |
2971 | if (!(adapter->class & driver->class)) | |
2972 | return 0; | |
2973 | ||
4735c98f JD |
2974 | /* Set up a temporary client to help detect callback */ |
2975 | temp_client = kzalloc(sizeof(struct i2c_client), GFP_KERNEL); | |
2976 | if (!temp_client) | |
2977 | return -ENOMEM; | |
2978 | temp_client->adapter = adapter; | |
2979 | ||
c3813d6a | 2980 | for (i = 0; address_list[i] != I2C_CLIENT_END; i += 1) { |
b93d3d37 AS |
2981 | dev_dbg(&adapter->dev, |
2982 | "found normal entry for adapter %d, addr 0x%02x\n", | |
2983 | adap_id, address_list[i]); | |
c3813d6a | 2984 | temp_client->addr = address_list[i]; |
ccfbbd08 | 2985 | err = i2c_detect_address(temp_client, driver); |
51b54ba9 JD |
2986 | if (unlikely(err)) |
2987 | break; | |
4735c98f JD |
2988 | } |
2989 | ||
4735c98f JD |
2990 | kfree(temp_client); |
2991 | return err; | |
2992 | } | |
2993 | ||
d44f19d5 JD |
2994 | int i2c_probe_func_quick_read(struct i2c_adapter *adap, unsigned short addr) |
2995 | { | |
2996 | return i2c_smbus_xfer(adap, addr, 0, I2C_SMBUS_READ, 0, | |
2997 | I2C_SMBUS_QUICK, NULL) >= 0; | |
2998 | } | |
2999 | EXPORT_SYMBOL_GPL(i2c_probe_func_quick_read); | |
3000 | ||
12b5053a JD |
3001 | struct i2c_client * |
3002 | i2c_new_probed_device(struct i2c_adapter *adap, | |
3003 | struct i2c_board_info *info, | |
9a94241a JD |
3004 | unsigned short const *addr_list, |
3005 | int (*probe)(struct i2c_adapter *, unsigned short addr)) | |
12b5053a JD |
3006 | { |
3007 | int i; | |
3008 | ||
8031d79b | 3009 | if (!probe) |
9a94241a | 3010 | probe = i2c_default_probe; |
12b5053a | 3011 | |
12b5053a JD |
3012 | for (i = 0; addr_list[i] != I2C_CLIENT_END; i++) { |
3013 | /* Check address validity */ | |
66be6056 | 3014 | if (i2c_check_7bit_addr_validity_strict(addr_list[i]) < 0) { |
b93d3d37 AS |
3015 | dev_warn(&adap->dev, "Invalid 7-bit address 0x%02x\n", |
3016 | addr_list[i]); | |
12b5053a JD |
3017 | continue; |
3018 | } | |
3019 | ||
9bccc70a | 3020 | /* Check address availability (7 bit, no need to encode flags) */ |
3b5f794b | 3021 | if (i2c_check_addr_busy(adap, addr_list[i])) { |
b93d3d37 AS |
3022 | dev_dbg(&adap->dev, |
3023 | "Address 0x%02x already in use, not probing\n", | |
3024 | addr_list[i]); | |
12b5053a JD |
3025 | continue; |
3026 | } | |
3027 | ||
63e4e802 | 3028 | /* Test address responsiveness */ |
9a94241a | 3029 | if (probe(adap, addr_list[i])) |
63e4e802 | 3030 | break; |
12b5053a | 3031 | } |
12b5053a JD |
3032 | |
3033 | if (addr_list[i] == I2C_CLIENT_END) { | |
3034 | dev_dbg(&adap->dev, "Probing failed, no device found\n"); | |
3035 | return NULL; | |
3036 | } | |
3037 | ||
3038 | info->addr = addr_list[i]; | |
3039 | return i2c_new_device(adap, info); | |
3040 | } | |
3041 | EXPORT_SYMBOL_GPL(i2c_new_probed_device); | |
3042 | ||
d735b34d | 3043 | struct i2c_adapter *i2c_get_adapter(int nr) |
1da177e4 | 3044 | { |
1da177e4 | 3045 | struct i2c_adapter *adapter; |
438d6c2c | 3046 | |
caada32a | 3047 | mutex_lock(&core_lock); |
d735b34d | 3048 | adapter = idr_find(&i2c_adapter_idr, nr); |
611e12ea VZ |
3049 | if (!adapter) |
3050 | goto exit; | |
3051 | ||
3052 | if (try_module_get(adapter->owner)) | |
3053 | get_device(&adapter->dev); | |
3054 | else | |
a0920e10 MH |
3055 | adapter = NULL; |
3056 | ||
611e12ea | 3057 | exit: |
caada32a | 3058 | mutex_unlock(&core_lock); |
a0920e10 | 3059 | return adapter; |
1da177e4 | 3060 | } |
c0564606 | 3061 | EXPORT_SYMBOL(i2c_get_adapter); |
1da177e4 LT |
3062 | |
3063 | void i2c_put_adapter(struct i2c_adapter *adap) | |
3064 | { | |
611e12ea VZ |
3065 | if (!adap) |
3066 | return; | |
3067 | ||
3068 | put_device(&adap->dev); | |
3069 | module_put(adap->owner); | |
1da177e4 | 3070 | } |
c0564606 | 3071 | EXPORT_SYMBOL(i2c_put_adapter); |
1da177e4 LT |
3072 | |
3073 | /* The SMBus parts */ | |
3074 | ||
438d6c2c | 3075 | #define POLY (0x1070U << 3) |
09b8ce0a | 3076 | static u8 crc8(u16 data) |
1da177e4 LT |
3077 | { |
3078 | int i; | |
438d6c2c | 3079 | |
7225acf4 | 3080 | for (i = 0; i < 8; i++) { |
438d6c2c | 3081 | if (data & 0x8000) |
1da177e4 LT |
3082 | data = data ^ POLY; |
3083 | data = data << 1; | |
3084 | } | |
3085 | return (u8)(data >> 8); | |
3086 | } | |
3087 | ||
421ef47b JD |
3088 | /* Incremental CRC8 over count bytes in the array pointed to by p */ |
3089 | static u8 i2c_smbus_pec(u8 crc, u8 *p, size_t count) | |
1da177e4 LT |
3090 | { |
3091 | int i; | |
3092 | ||
7225acf4 | 3093 | for (i = 0; i < count; i++) |
421ef47b | 3094 | crc = crc8((crc ^ p[i]) << 8); |
1da177e4 LT |
3095 | return crc; |
3096 | } | |
3097 | ||
421ef47b JD |
3098 | /* Assume a 7-bit address, which is reasonable for SMBus */ |
3099 | static u8 i2c_smbus_msg_pec(u8 pec, struct i2c_msg *msg) | |
1da177e4 | 3100 | { |
421ef47b | 3101 | /* The address will be sent first */ |
041edda8 | 3102 | u8 addr = i2c_8bit_addr_from_msg(msg); |
421ef47b JD |
3103 | pec = i2c_smbus_pec(pec, &addr, 1); |
3104 | ||
3105 | /* The data buffer follows */ | |
3106 | return i2c_smbus_pec(pec, msg->buf, msg->len); | |
1da177e4 LT |
3107 | } |
3108 | ||
421ef47b JD |
3109 | /* Used for write only transactions */ |
3110 | static inline void i2c_smbus_add_pec(struct i2c_msg *msg) | |
1da177e4 | 3111 | { |
421ef47b JD |
3112 | msg->buf[msg->len] = i2c_smbus_msg_pec(0, msg); |
3113 | msg->len++; | |
1da177e4 LT |
3114 | } |
3115 | ||
421ef47b JD |
3116 | /* Return <0 on CRC error |
3117 | If there was a write before this read (most cases) we need to take the | |
3118 | partial CRC from the write part into account. | |
3119 | Note that this function does modify the message (we need to decrease the | |
3120 | message length to hide the CRC byte from the caller). */ | |
3121 | static int i2c_smbus_check_pec(u8 cpec, struct i2c_msg *msg) | |
1da177e4 | 3122 | { |
421ef47b JD |
3123 | u8 rpec = msg->buf[--msg->len]; |
3124 | cpec = i2c_smbus_msg_pec(cpec, msg); | |
1da177e4 | 3125 | |
1da177e4 | 3126 | if (rpec != cpec) { |
44239a5a | 3127 | pr_debug("Bad PEC 0x%02x vs. 0x%02x\n", |
1da177e4 | 3128 | rpec, cpec); |
24a5bb7b | 3129 | return -EBADMSG; |
1da177e4 | 3130 | } |
438d6c2c | 3131 | return 0; |
1da177e4 LT |
3132 | } |
3133 | ||
a1cdedac DB |
3134 | /** |
3135 | * i2c_smbus_read_byte - SMBus "receive byte" protocol | |
3136 | * @client: Handle to slave device | |
3137 | * | |
3138 | * This executes the SMBus "receive byte" protocol, returning negative errno | |
3139 | * else the byte received from the device. | |
3140 | */ | |
0cc43a18 | 3141 | s32 i2c_smbus_read_byte(const struct i2c_client *client) |
1da177e4 LT |
3142 | { |
3143 | union i2c_smbus_data data; | |
24a5bb7b DB |
3144 | int status; |
3145 | ||
3146 | status = i2c_smbus_xfer(client->adapter, client->addr, client->flags, | |
3147 | I2C_SMBUS_READ, 0, | |
3148 | I2C_SMBUS_BYTE, &data); | |
3149 | return (status < 0) ? status : data.byte; | |
1da177e4 | 3150 | } |
c0564606 | 3151 | EXPORT_SYMBOL(i2c_smbus_read_byte); |
1da177e4 | 3152 | |
a1cdedac DB |
3153 | /** |
3154 | * i2c_smbus_write_byte - SMBus "send byte" protocol | |
3155 | * @client: Handle to slave device | |
3156 | * @value: Byte to be sent | |
3157 | * | |
3158 | * This executes the SMBus "send byte" protocol, returning negative errno | |
3159 | * else zero on success. | |
3160 | */ | |
0cc43a18 | 3161 | s32 i2c_smbus_write_byte(const struct i2c_client *client, u8 value) |
1da177e4 | 3162 | { |
7225acf4 | 3163 | return i2c_smbus_xfer(client->adapter, client->addr, client->flags, |
421ef47b | 3164 | I2C_SMBUS_WRITE, value, I2C_SMBUS_BYTE, NULL); |
1da177e4 | 3165 | } |
c0564606 | 3166 | EXPORT_SYMBOL(i2c_smbus_write_byte); |
1da177e4 | 3167 | |
a1cdedac DB |
3168 | /** |
3169 | * i2c_smbus_read_byte_data - SMBus "read byte" protocol | |
3170 | * @client: Handle to slave device | |
3171 | * @command: Byte interpreted by slave | |
3172 | * | |
3173 | * This executes the SMBus "read byte" protocol, returning negative errno | |
3174 | * else a data byte received from the device. | |
3175 | */ | |
0cc43a18 | 3176 | s32 i2c_smbus_read_byte_data(const struct i2c_client *client, u8 command) |
1da177e4 LT |
3177 | { |
3178 | union i2c_smbus_data data; | |
24a5bb7b DB |
3179 | int status; |
3180 | ||
3181 | status = i2c_smbus_xfer(client->adapter, client->addr, client->flags, | |
3182 | I2C_SMBUS_READ, command, | |
3183 | I2C_SMBUS_BYTE_DATA, &data); | |
3184 | return (status < 0) ? status : data.byte; | |
1da177e4 | 3185 | } |
c0564606 | 3186 | EXPORT_SYMBOL(i2c_smbus_read_byte_data); |
1da177e4 | 3187 | |
a1cdedac DB |
3188 | /** |
3189 | * i2c_smbus_write_byte_data - SMBus "write byte" protocol | |
3190 | * @client: Handle to slave device | |
3191 | * @command: Byte interpreted by slave | |
3192 | * @value: Byte being written | |
3193 | * | |
3194 | * This executes the SMBus "write byte" protocol, returning negative errno | |
3195 | * else zero on success. | |
3196 | */ | |
0cc43a18 JD |
3197 | s32 i2c_smbus_write_byte_data(const struct i2c_client *client, u8 command, |
3198 | u8 value) | |
1da177e4 LT |
3199 | { |
3200 | union i2c_smbus_data data; | |
3201 | data.byte = value; | |
7225acf4 FH |
3202 | return i2c_smbus_xfer(client->adapter, client->addr, client->flags, |
3203 | I2C_SMBUS_WRITE, command, | |
3204 | I2C_SMBUS_BYTE_DATA, &data); | |
1da177e4 | 3205 | } |
c0564606 | 3206 | EXPORT_SYMBOL(i2c_smbus_write_byte_data); |
1da177e4 | 3207 | |
a1cdedac DB |
3208 | /** |
3209 | * i2c_smbus_read_word_data - SMBus "read word" protocol | |
3210 | * @client: Handle to slave device | |
3211 | * @command: Byte interpreted by slave | |
3212 | * | |
3213 | * This executes the SMBus "read word" protocol, returning negative errno | |
3214 | * else a 16-bit unsigned "word" received from the device. | |
3215 | */ | |
0cc43a18 | 3216 | s32 i2c_smbus_read_word_data(const struct i2c_client *client, u8 command) |
1da177e4 LT |
3217 | { |
3218 | union i2c_smbus_data data; | |
24a5bb7b DB |
3219 | int status; |
3220 | ||
3221 | status = i2c_smbus_xfer(client->adapter, client->addr, client->flags, | |
3222 | I2C_SMBUS_READ, command, | |
3223 | I2C_SMBUS_WORD_DATA, &data); | |
3224 | return (status < 0) ? status : data.word; | |
1da177e4 | 3225 | } |
c0564606 | 3226 | EXPORT_SYMBOL(i2c_smbus_read_word_data); |
1da177e4 | 3227 | |
a1cdedac DB |
3228 | /** |
3229 | * i2c_smbus_write_word_data - SMBus "write word" protocol | |
3230 | * @client: Handle to slave device | |
3231 | * @command: Byte interpreted by slave | |
3232 | * @value: 16-bit "word" being written | |
3233 | * | |
3234 | * This executes the SMBus "write word" protocol, returning negative errno | |
3235 | * else zero on success. | |
3236 | */ | |
0cc43a18 JD |
3237 | s32 i2c_smbus_write_word_data(const struct i2c_client *client, u8 command, |
3238 | u16 value) | |
1da177e4 LT |
3239 | { |
3240 | union i2c_smbus_data data; | |
3241 | data.word = value; | |
7225acf4 FH |
3242 | return i2c_smbus_xfer(client->adapter, client->addr, client->flags, |
3243 | I2C_SMBUS_WRITE, command, | |
3244 | I2C_SMBUS_WORD_DATA, &data); | |
1da177e4 | 3245 | } |
c0564606 | 3246 | EXPORT_SYMBOL(i2c_smbus_write_word_data); |
1da177e4 | 3247 | |
a64ec07d | 3248 | /** |
a1cdedac | 3249 | * i2c_smbus_read_block_data - SMBus "block read" protocol |
a64ec07d | 3250 | * @client: Handle to slave device |
a1cdedac | 3251 | * @command: Byte interpreted by slave |
a64ec07d DB |
3252 | * @values: Byte array into which data will be read; big enough to hold |
3253 | * the data returned by the slave. SMBus allows at most 32 bytes. | |
3254 | * | |
a1cdedac DB |
3255 | * This executes the SMBus "block read" protocol, returning negative errno |
3256 | * else the number of data bytes in the slave's response. | |
a64ec07d DB |
3257 | * |
3258 | * Note that using this function requires that the client's adapter support | |
3259 | * the I2C_FUNC_SMBUS_READ_BLOCK_DATA functionality. Not all adapter drivers | |
3260 | * support this; its emulation through I2C messaging relies on a specific | |
3261 | * mechanism (I2C_M_RECV_LEN) which may not be implemented. | |
3262 | */ | |
0cc43a18 | 3263 | s32 i2c_smbus_read_block_data(const struct i2c_client *client, u8 command, |
b86a1bc8 JD |
3264 | u8 *values) |
3265 | { | |
3266 | union i2c_smbus_data data; | |
24a5bb7b | 3267 | int status; |
b86a1bc8 | 3268 | |
24a5bb7b DB |
3269 | status = i2c_smbus_xfer(client->adapter, client->addr, client->flags, |
3270 | I2C_SMBUS_READ, command, | |
3271 | I2C_SMBUS_BLOCK_DATA, &data); | |
3272 | if (status) | |
3273 | return status; | |
b86a1bc8 JD |
3274 | |
3275 | memcpy(values, &data.block[1], data.block[0]); | |
3276 | return data.block[0]; | |
3277 | } | |
3278 | EXPORT_SYMBOL(i2c_smbus_read_block_data); | |
3279 | ||
a1cdedac DB |
3280 | /** |
3281 | * i2c_smbus_write_block_data - SMBus "block write" protocol | |
3282 | * @client: Handle to slave device | |
3283 | * @command: Byte interpreted by slave | |
3284 | * @length: Size of data block; SMBus allows at most 32 bytes | |
3285 | * @values: Byte array which will be written. | |
3286 | * | |
3287 | * This executes the SMBus "block write" protocol, returning negative errno | |
3288 | * else zero on success. | |
3289 | */ | |
0cc43a18 | 3290 | s32 i2c_smbus_write_block_data(const struct i2c_client *client, u8 command, |
46f5ed75 | 3291 | u8 length, const u8 *values) |
1da177e4 LT |
3292 | { |
3293 | union i2c_smbus_data data; | |
7656032b | 3294 | |
1da177e4 LT |
3295 | if (length > I2C_SMBUS_BLOCK_MAX) |
3296 | length = I2C_SMBUS_BLOCK_MAX; | |
1da177e4 | 3297 | data.block[0] = length; |
7656032b | 3298 | memcpy(&data.block[1], values, length); |
7225acf4 FH |
3299 | return i2c_smbus_xfer(client->adapter, client->addr, client->flags, |
3300 | I2C_SMBUS_WRITE, command, | |
3301 | I2C_SMBUS_BLOCK_DATA, &data); | |
1da177e4 | 3302 | } |
c0564606 | 3303 | EXPORT_SYMBOL(i2c_smbus_write_block_data); |
1da177e4 LT |
3304 | |
3305 | /* Returns the number of read bytes */ | |
0cc43a18 | 3306 | s32 i2c_smbus_read_i2c_block_data(const struct i2c_client *client, u8 command, |
4b2643d7 | 3307 | u8 length, u8 *values) |
1da177e4 LT |
3308 | { |
3309 | union i2c_smbus_data data; | |
24a5bb7b | 3310 | int status; |
7656032b | 3311 | |
4b2643d7 JD |
3312 | if (length > I2C_SMBUS_BLOCK_MAX) |
3313 | length = I2C_SMBUS_BLOCK_MAX; | |
3314 | data.block[0] = length; | |
24a5bb7b DB |
3315 | status = i2c_smbus_xfer(client->adapter, client->addr, client->flags, |
3316 | I2C_SMBUS_READ, command, | |
3317 | I2C_SMBUS_I2C_BLOCK_DATA, &data); | |
3318 | if (status < 0) | |
3319 | return status; | |
7656032b JD |
3320 | |
3321 | memcpy(values, &data.block[1], data.block[0]); | |
3322 | return data.block[0]; | |
1da177e4 | 3323 | } |
c0564606 | 3324 | EXPORT_SYMBOL(i2c_smbus_read_i2c_block_data); |
1da177e4 | 3325 | |
0cc43a18 | 3326 | s32 i2c_smbus_write_i2c_block_data(const struct i2c_client *client, u8 command, |
46f5ed75 | 3327 | u8 length, const u8 *values) |
21bbd691 JD |
3328 | { |
3329 | union i2c_smbus_data data; | |
3330 | ||
3331 | if (length > I2C_SMBUS_BLOCK_MAX) | |
3332 | length = I2C_SMBUS_BLOCK_MAX; | |
3333 | data.block[0] = length; | |
3334 | memcpy(data.block + 1, values, length); | |
3335 | return i2c_smbus_xfer(client->adapter, client->addr, client->flags, | |
3336 | I2C_SMBUS_WRITE, command, | |
3337 | I2C_SMBUS_I2C_BLOCK_DATA, &data); | |
3338 | } | |
c0564606 | 3339 | EXPORT_SYMBOL(i2c_smbus_write_i2c_block_data); |
21bbd691 | 3340 | |
438d6c2c | 3341 | /* Simulate a SMBus command using the i2c protocol |
1da177e4 | 3342 | No checking of parameters is done! */ |
7225acf4 FH |
3343 | static s32 i2c_smbus_xfer_emulated(struct i2c_adapter *adapter, u16 addr, |
3344 | unsigned short flags, | |
3345 | char read_write, u8 command, int size, | |
3346 | union i2c_smbus_data *data) | |
1da177e4 LT |
3347 | { |
3348 | /* So we need to generate a series of msgs. In the case of writing, we | |
3349 | need to use only one message; when reading, we need two. We initialize | |
3350 | most things with sane defaults, to keep the code below somewhat | |
3351 | simpler. */ | |
5c50d188 HI |
3352 | unsigned char msgbuf0[I2C_SMBUS_BLOCK_MAX+3]; |
3353 | unsigned char msgbuf1[I2C_SMBUS_BLOCK_MAX+2]; | |
7225acf4 | 3354 | int num = read_write == I2C_SMBUS_READ ? 2 : 1; |
1da177e4 | 3355 | int i; |
421ef47b | 3356 | u8 partial_pec = 0; |
24a5bb7b | 3357 | int status; |
230da094 S |
3358 | struct i2c_msg msg[2] = { |
3359 | { | |
3360 | .addr = addr, | |
3361 | .flags = flags, | |
3362 | .len = 1, | |
3363 | .buf = msgbuf0, | |
3364 | }, { | |
3365 | .addr = addr, | |
3366 | .flags = flags | I2C_M_RD, | |
3367 | .len = 0, | |
3368 | .buf = msgbuf1, | |
3369 | }, | |
3370 | }; | |
1da177e4 LT |
3371 | |
3372 | msgbuf0[0] = command; | |
7225acf4 | 3373 | switch (size) { |
1da177e4 LT |
3374 | case I2C_SMBUS_QUICK: |
3375 | msg[0].len = 0; | |
3376 | /* Special case: The read/write field is used as data */ | |
f29d2e02 RK |
3377 | msg[0].flags = flags | (read_write == I2C_SMBUS_READ ? |
3378 | I2C_M_RD : 0); | |
1da177e4 LT |
3379 | num = 1; |
3380 | break; | |
3381 | case I2C_SMBUS_BYTE: | |
3382 | if (read_write == I2C_SMBUS_READ) { | |
3383 | /* Special case: only a read! */ | |
3384 | msg[0].flags = I2C_M_RD | flags; | |
3385 | num = 1; | |
3386 | } | |
3387 | break; | |
3388 | case I2C_SMBUS_BYTE_DATA: | |
3389 | if (read_write == I2C_SMBUS_READ) | |
3390 | msg[1].len = 1; | |
3391 | else { | |
3392 | msg[0].len = 2; | |
3393 | msgbuf0[1] = data->byte; | |
3394 | } | |
3395 | break; | |
3396 | case I2C_SMBUS_WORD_DATA: | |
3397 | if (read_write == I2C_SMBUS_READ) | |
3398 | msg[1].len = 2; | |
3399 | else { | |
7225acf4 | 3400 | msg[0].len = 3; |
1da177e4 | 3401 | msgbuf0[1] = data->word & 0xff; |
7eff82c8 | 3402 | msgbuf0[2] = data->word >> 8; |
1da177e4 LT |
3403 | } |
3404 | break; | |
3405 | case I2C_SMBUS_PROC_CALL: | |
3406 | num = 2; /* Special case */ | |
3407 | read_write = I2C_SMBUS_READ; | |
3408 | msg[0].len = 3; | |
3409 | msg[1].len = 2; | |
3410 | msgbuf0[1] = data->word & 0xff; | |
7eff82c8 | 3411 | msgbuf0[2] = data->word >> 8; |
1da177e4 LT |
3412 | break; |
3413 | case I2C_SMBUS_BLOCK_DATA: | |
1da177e4 | 3414 | if (read_write == I2C_SMBUS_READ) { |
209d27c3 JD |
3415 | msg[1].flags |= I2C_M_RECV_LEN; |
3416 | msg[1].len = 1; /* block length will be added by | |
3417 | the underlying bus driver */ | |
1da177e4 LT |
3418 | } else { |
3419 | msg[0].len = data->block[0] + 2; | |
3420 | if (msg[0].len > I2C_SMBUS_BLOCK_MAX + 2) { | |
24a5bb7b DB |
3421 | dev_err(&adapter->dev, |
3422 | "Invalid block write size %d\n", | |
3423 | data->block[0]); | |
3424 | return -EINVAL; | |
1da177e4 | 3425 | } |
5c50d188 | 3426 | for (i = 1; i < msg[0].len; i++) |
1da177e4 LT |
3427 | msgbuf0[i] = data->block[i-1]; |
3428 | } | |
3429 | break; | |
3430 | case I2C_SMBUS_BLOCK_PROC_CALL: | |
209d27c3 JD |
3431 | num = 2; /* Another special case */ |
3432 | read_write = I2C_SMBUS_READ; | |
3433 | if (data->block[0] > I2C_SMBUS_BLOCK_MAX) { | |
24a5bb7b DB |
3434 | dev_err(&adapter->dev, |
3435 | "Invalid block write size %d\n", | |
209d27c3 | 3436 | data->block[0]); |
24a5bb7b | 3437 | return -EINVAL; |
209d27c3 JD |
3438 | } |
3439 | msg[0].len = data->block[0] + 2; | |
3440 | for (i = 1; i < msg[0].len; i++) | |
3441 | msgbuf0[i] = data->block[i-1]; | |
3442 | msg[1].flags |= I2C_M_RECV_LEN; | |
3443 | msg[1].len = 1; /* block length will be added by | |
3444 | the underlying bus driver */ | |
3445 | break; | |
1da177e4 LT |
3446 | case I2C_SMBUS_I2C_BLOCK_DATA: |
3447 | if (read_write == I2C_SMBUS_READ) { | |
4b2643d7 | 3448 | msg[1].len = data->block[0]; |
1da177e4 LT |
3449 | } else { |
3450 | msg[0].len = data->block[0] + 1; | |
30dac746 | 3451 | if (msg[0].len > I2C_SMBUS_BLOCK_MAX + 1) { |
24a5bb7b DB |
3452 | dev_err(&adapter->dev, |
3453 | "Invalid block write size %d\n", | |
3454 | data->block[0]); | |
3455 | return -EINVAL; | |
1da177e4 LT |
3456 | } |
3457 | for (i = 1; i <= data->block[0]; i++) | |
3458 | msgbuf0[i] = data->block[i]; | |
3459 | } | |
3460 | break; | |
3461 | default: | |
24a5bb7b DB |
3462 | dev_err(&adapter->dev, "Unsupported transaction %d\n", size); |
3463 | return -EOPNOTSUPP; | |
1da177e4 LT |
3464 | } |
3465 | ||
421ef47b JD |
3466 | i = ((flags & I2C_CLIENT_PEC) && size != I2C_SMBUS_QUICK |
3467 | && size != I2C_SMBUS_I2C_BLOCK_DATA); | |
3468 | if (i) { | |
3469 | /* Compute PEC if first message is a write */ | |
3470 | if (!(msg[0].flags & I2C_M_RD)) { | |
438d6c2c | 3471 | if (num == 1) /* Write only */ |
421ef47b JD |
3472 | i2c_smbus_add_pec(&msg[0]); |
3473 | else /* Write followed by read */ | |
3474 | partial_pec = i2c_smbus_msg_pec(0, &msg[0]); | |
3475 | } | |
3476 | /* Ask for PEC if last message is a read */ | |
3477 | if (msg[num-1].flags & I2C_M_RD) | |
438d6c2c | 3478 | msg[num-1].len++; |
421ef47b JD |
3479 | } |
3480 | ||
24a5bb7b DB |
3481 | status = i2c_transfer(adapter, msg, num); |
3482 | if (status < 0) | |
3483 | return status; | |
1da177e4 | 3484 | |
421ef47b JD |
3485 | /* Check PEC if last message is a read */ |
3486 | if (i && (msg[num-1].flags & I2C_M_RD)) { | |
24a5bb7b DB |
3487 | status = i2c_smbus_check_pec(partial_pec, &msg[num-1]); |
3488 | if (status < 0) | |
3489 | return status; | |
421ef47b JD |
3490 | } |
3491 | ||
1da177e4 | 3492 | if (read_write == I2C_SMBUS_READ) |
7225acf4 FH |
3493 | switch (size) { |
3494 | case I2C_SMBUS_BYTE: | |
3495 | data->byte = msgbuf0[0]; | |
3496 | break; | |
3497 | case I2C_SMBUS_BYTE_DATA: | |
3498 | data->byte = msgbuf1[0]; | |
3499 | break; | |
3500 | case I2C_SMBUS_WORD_DATA: | |
3501 | case I2C_SMBUS_PROC_CALL: | |
3502 | data->word = msgbuf1[0] | (msgbuf1[1] << 8); | |
3503 | break; | |
3504 | case I2C_SMBUS_I2C_BLOCK_DATA: | |
3505 | for (i = 0; i < data->block[0]; i++) | |
3506 | data->block[i+1] = msgbuf1[i]; | |
3507 | break; | |
3508 | case I2C_SMBUS_BLOCK_DATA: | |
3509 | case I2C_SMBUS_BLOCK_PROC_CALL: | |
3510 | for (i = 0; i < msgbuf1[0] + 1; i++) | |
3511 | data->block[i] = msgbuf1[i]; | |
3512 | break; | |
1da177e4 LT |
3513 | } |
3514 | return 0; | |
3515 | } | |
3516 | ||
a1cdedac DB |
3517 | /** |
3518 | * i2c_smbus_xfer - execute SMBus protocol operations | |
3519 | * @adapter: Handle to I2C bus | |
3520 | * @addr: Address of SMBus slave on that bus | |
3521 | * @flags: I2C_CLIENT_* flags (usually zero or I2C_CLIENT_PEC) | |
3522 | * @read_write: I2C_SMBUS_READ or I2C_SMBUS_WRITE | |
3523 | * @command: Byte interpreted by slave, for protocols which use such bytes | |
3524 | * @protocol: SMBus protocol operation to execute, such as I2C_SMBUS_PROC_CALL | |
3525 | * @data: Data to be read or written | |
3526 | * | |
3527 | * This executes an SMBus protocol operation, and returns a negative | |
3528 | * errno code else zero on success. | |
3529 | */ | |
09b8ce0a | 3530 | s32 i2c_smbus_xfer(struct i2c_adapter *adapter, u16 addr, unsigned short flags, |
a1cdedac | 3531 | char read_write, u8 command, int protocol, |
09b8ce0a | 3532 | union i2c_smbus_data *data) |
1da177e4 | 3533 | { |
66b650f0 CW |
3534 | unsigned long orig_jiffies; |
3535 | int try; | |
1da177e4 | 3536 | s32 res; |
1da177e4 | 3537 | |
8a325997 DH |
3538 | /* If enabled, the following two tracepoints are conditional on |
3539 | * read_write and protocol. | |
3540 | */ | |
3541 | trace_smbus_write(adapter, addr, flags, read_write, | |
3542 | command, protocol, data); | |
3543 | trace_smbus_read(adapter, addr, flags, read_write, | |
3544 | command, protocol); | |
3545 | ||
d47726c5 | 3546 | flags &= I2C_M_TEN | I2C_CLIENT_PEC | I2C_CLIENT_SCCB; |
1da177e4 LT |
3547 | |
3548 | if (adapter->algo->smbus_xfer) { | |
8320f495 | 3549 | i2c_lock_bus(adapter, I2C_LOCK_SEGMENT); |
66b650f0 CW |
3550 | |
3551 | /* Retry automatically on arbitration loss */ | |
3552 | orig_jiffies = jiffies; | |
3553 | for (res = 0, try = 0; try <= adapter->retries; try++) { | |
3554 | res = adapter->algo->smbus_xfer(adapter, addr, flags, | |
3555 | read_write, command, | |
3556 | protocol, data); | |
3557 | if (res != -EAGAIN) | |
3558 | break; | |
3559 | if (time_after(jiffies, | |
3560 | orig_jiffies + adapter->timeout)) | |
3561 | break; | |
3562 | } | |
8320f495 | 3563 | i2c_unlock_bus(adapter, I2C_LOCK_SEGMENT); |
1da177e4 | 3564 | |
72fc2c7f | 3565 | if (res != -EOPNOTSUPP || !adapter->algo->master_xfer) |
8a325997 | 3566 | goto trace; |
72fc2c7f LP |
3567 | /* |
3568 | * Fall back to i2c_smbus_xfer_emulated if the adapter doesn't | |
3569 | * implement native support for the SMBus operation. | |
3570 | */ | |
3571 | } | |
3572 | ||
8a325997 DH |
3573 | res = i2c_smbus_xfer_emulated(adapter, addr, flags, read_write, |
3574 | command, protocol, data); | |
3575 | ||
3576 | trace: | |
3577 | /* If enabled, the reply tracepoint is conditional on read_write. */ | |
3578 | trace_smbus_reply(adapter, addr, flags, read_write, | |
3579 | command, protocol, data); | |
3580 | trace_smbus_result(adapter, addr, flags, read_write, | |
3581 | command, protocol, res); | |
3582 | ||
3583 | return res; | |
1da177e4 | 3584 | } |
1da177e4 | 3585 | EXPORT_SYMBOL(i2c_smbus_xfer); |
1da177e4 | 3586 | |
01eef96e IT |
3587 | /** |
3588 | * i2c_smbus_read_i2c_block_data_or_emulated - read block or emulate | |
3589 | * @client: Handle to slave device | |
3590 | * @command: Byte interpreted by slave | |
3591 | * @length: Size of data block; SMBus allows at most I2C_SMBUS_BLOCK_MAX bytes | |
3592 | * @values: Byte array into which data will be read; big enough to hold | |
3593 | * the data returned by the slave. SMBus allows at most | |
3594 | * I2C_SMBUS_BLOCK_MAX bytes. | |
3595 | * | |
3596 | * This executes the SMBus "block read" protocol if supported by the adapter. | |
3597 | * If block read is not supported, it emulates it using either word or byte | |
3598 | * read protocols depending on availability. | |
3599 | * | |
3600 | * The addresses of the I2C slave device that are accessed with this function | |
3601 | * must be mapped to a linear region, so that a block read will have the same | |
3602 | * effect as a byte read. Before using this function you must double-check | |
3603 | * if the I2C slave does support exchanging a block transfer with a byte | |
3604 | * transfer. | |
3605 | */ | |
3606 | s32 i2c_smbus_read_i2c_block_data_or_emulated(const struct i2c_client *client, | |
3607 | u8 command, u8 length, u8 *values) | |
3608 | { | |
3609 | u8 i = 0; | |
3610 | int status; | |
3611 | ||
3612 | if (length > I2C_SMBUS_BLOCK_MAX) | |
3613 | length = I2C_SMBUS_BLOCK_MAX; | |
3614 | ||
3615 | if (i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_READ_I2C_BLOCK)) | |
3616 | return i2c_smbus_read_i2c_block_data(client, command, length, values); | |
3617 | ||
3618 | if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_READ_BYTE_DATA)) | |
3619 | return -EOPNOTSUPP; | |
3620 | ||
3621 | if (i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_READ_WORD_DATA)) { | |
3622 | while ((i + 2) <= length) { | |
3623 | status = i2c_smbus_read_word_data(client, command + i); | |
3624 | if (status < 0) | |
3625 | return status; | |
3626 | values[i] = status & 0xff; | |
3627 | values[i + 1] = status >> 8; | |
3628 | i += 2; | |
3629 | } | |
3630 | } | |
3631 | ||
3632 | while (i < length) { | |
3633 | status = i2c_smbus_read_byte_data(client, command + i); | |
3634 | if (status < 0) | |
3635 | return status; | |
3636 | values[i] = status; | |
3637 | i++; | |
3638 | } | |
3639 | ||
3640 | return i; | |
3641 | } | |
3642 | EXPORT_SYMBOL(i2c_smbus_read_i2c_block_data_or_emulated); | |
3643 | ||
d5fd120e | 3644 | #if IS_ENABLED(CONFIG_I2C_SLAVE) |
4b1acc43 WS |
3645 | int i2c_slave_register(struct i2c_client *client, i2c_slave_cb_t slave_cb) |
3646 | { | |
3647 | int ret; | |
3648 | ||
0c7cab96 | 3649 | if (!client || !slave_cb) { |
2659161d | 3650 | WARN(1, "insufficient data\n"); |
4b1acc43 | 3651 | return -EINVAL; |
0c7cab96 | 3652 | } |
4b1acc43 | 3653 | |
c6909d6f WS |
3654 | if (!(client->flags & I2C_CLIENT_SLAVE)) |
3655 | dev_warn(&client->dev, "%s: client slave flag not set. You might see address collisions\n", | |
3656 | __func__); | |
3657 | ||
4b1acc43 WS |
3658 | if (!(client->flags & I2C_CLIENT_TEN)) { |
3659 | /* Enforce stricter address checking */ | |
66be6056 | 3660 | ret = i2c_check_7bit_addr_validity_strict(client->addr); |
0c7cab96 WS |
3661 | if (ret) { |
3662 | dev_err(&client->dev, "%s: invalid address\n", __func__); | |
4b1acc43 | 3663 | return ret; |
0c7cab96 | 3664 | } |
4b1acc43 WS |
3665 | } |
3666 | ||
0c7cab96 WS |
3667 | if (!client->adapter->algo->reg_slave) { |
3668 | dev_err(&client->dev, "%s: not supported by adapter\n", __func__); | |
4b1acc43 | 3669 | return -EOPNOTSUPP; |
0c7cab96 | 3670 | } |
4b1acc43 WS |
3671 | |
3672 | client->slave_cb = slave_cb; | |
3673 | ||
3674 | i2c_lock_adapter(client->adapter); | |
3675 | ret = client->adapter->algo->reg_slave(client); | |
3676 | i2c_unlock_adapter(client->adapter); | |
3677 | ||
0c7cab96 | 3678 | if (ret) { |
4b1acc43 | 3679 | client->slave_cb = NULL; |
0c7cab96 WS |
3680 | dev_err(&client->dev, "%s: adapter returned error %d\n", __func__, ret); |
3681 | } | |
4b1acc43 WS |
3682 | |
3683 | return ret; | |
3684 | } | |
3685 | EXPORT_SYMBOL_GPL(i2c_slave_register); | |
3686 | ||
3687 | int i2c_slave_unregister(struct i2c_client *client) | |
3688 | { | |
3689 | int ret; | |
3690 | ||
0c7cab96 WS |
3691 | if (!client->adapter->algo->unreg_slave) { |
3692 | dev_err(&client->dev, "%s: not supported by adapter\n", __func__); | |
4b1acc43 | 3693 | return -EOPNOTSUPP; |
0c7cab96 | 3694 | } |
4b1acc43 WS |
3695 | |
3696 | i2c_lock_adapter(client->adapter); | |
3697 | ret = client->adapter->algo->unreg_slave(client); | |
3698 | i2c_unlock_adapter(client->adapter); | |
3699 | ||
3700 | if (ret == 0) | |
3701 | client->slave_cb = NULL; | |
0c7cab96 WS |
3702 | else |
3703 | dev_err(&client->dev, "%s: adapter returned error %d\n", __func__, ret); | |
4b1acc43 WS |
3704 | |
3705 | return ret; | |
3706 | } | |
3707 | EXPORT_SYMBOL_GPL(i2c_slave_unregister); | |
d5fd120e | 3708 | #endif |
4b1acc43 | 3709 | |
1da177e4 LT |
3710 | MODULE_AUTHOR("Simon G. Vogl <simon@tk.uni-linz.ac.at>"); |
3711 | MODULE_DESCRIPTION("I2C-Bus main module"); | |
3712 | MODULE_LICENSE("GPL"); |