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