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53f8f7c5 WS |
1 | /* |
2 | * Linux I2C core ACPI support code | |
3 | * | |
4 | * Copyright (C) 2014 Intel Corp, Author: Lan Tianyu <tianyu.lan@intel.com> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify it | |
7 | * under the terms of the GNU General Public License as published by the Free | |
8 | * Software Foundation; either version 2 of the License, or (at your option) | |
9 | * any later version. | |
10 | */ | |
11 | ||
12 | #include <linux/acpi.h> | |
13 | #include <linux/device.h> | |
14 | #include <linux/err.h> | |
15 | #include <linux/i2c.h> | |
16 | #include <linux/list.h> | |
17 | #include <linux/module.h> | |
18 | #include <linux/slab.h> | |
19 | ||
20 | #include "i2c-core.h" | |
21 | ||
22 | struct i2c_acpi_handler_data { | |
23 | struct acpi_connection_info info; | |
24 | struct i2c_adapter *adapter; | |
25 | }; | |
26 | ||
27 | struct gsb_buffer { | |
28 | u8 status; | |
29 | u8 len; | |
30 | union { | |
31 | u16 wdata; | |
32 | u8 bdata; | |
33 | u8 data[0]; | |
34 | }; | |
35 | } __packed; | |
36 | ||
37 | struct i2c_acpi_lookup { | |
38 | struct i2c_board_info *info; | |
39 | acpi_handle adapter_handle; | |
40 | acpi_handle device_handle; | |
41 | acpi_handle search_handle; | |
42 | int n; | |
43 | int index; | |
44 | u32 speed; | |
45 | u32 min_speed; | |
46 | }; | |
47 | ||
48 | static int i2c_acpi_fill_info(struct acpi_resource *ares, void *data) | |
49 | { | |
50 | struct i2c_acpi_lookup *lookup = data; | |
51 | struct i2c_board_info *info = lookup->info; | |
52 | struct acpi_resource_i2c_serialbus *sb; | |
53 | acpi_status status; | |
54 | ||
55 | if (info->addr || ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS) | |
56 | return 1; | |
57 | ||
58 | sb = &ares->data.i2c_serial_bus; | |
59 | if (sb->type != ACPI_RESOURCE_SERIAL_TYPE_I2C) | |
60 | return 1; | |
61 | ||
62 | if (lookup->index != -1 && lookup->n++ != lookup->index) | |
63 | return 1; | |
64 | ||
65 | status = acpi_get_handle(lookup->device_handle, | |
66 | sb->resource_source.string_ptr, | |
67 | &lookup->adapter_handle); | |
68 | if (!ACPI_SUCCESS(status)) | |
69 | return 1; | |
70 | ||
71 | info->addr = sb->slave_address; | |
72 | lookup->speed = sb->connection_speed; | |
73 | if (sb->access_mode == ACPI_I2C_10BIT_MODE) | |
74 | info->flags |= I2C_CLIENT_TEN; | |
75 | ||
76 | return 1; | |
77 | } | |
78 | ||
3a4991a9 HG |
79 | static const struct acpi_device_id i2c_acpi_ignored_device_ids[] = { |
80 | /* | |
81 | * ACPI video acpi_devices, which are handled by the acpi-video driver | |
82 | * sometimes contain a SERIAL_TYPE_I2C ACPI resource, ignore these. | |
83 | */ | |
84 | { ACPI_VIDEO_HID, 0 }, | |
85 | {} | |
86 | }; | |
87 | ||
53f8f7c5 WS |
88 | static int i2c_acpi_do_lookup(struct acpi_device *adev, |
89 | struct i2c_acpi_lookup *lookup) | |
90 | { | |
91 | struct i2c_board_info *info = lookup->info; | |
92 | struct list_head resource_list; | |
93 | int ret; | |
94 | ||
95 | if (acpi_bus_get_status(adev) || !adev->status.present || | |
96 | acpi_device_enumerated(adev)) | |
97 | return -EINVAL; | |
98 | ||
3a4991a9 HG |
99 | if (acpi_match_device_ids(adev, i2c_acpi_ignored_device_ids) == 0) |
100 | return -ENODEV; | |
101 | ||
53f8f7c5 WS |
102 | memset(info, 0, sizeof(*info)); |
103 | lookup->device_handle = acpi_device_handle(adev); | |
104 | ||
105 | /* Look up for I2cSerialBus resource */ | |
106 | INIT_LIST_HEAD(&resource_list); | |
107 | ret = acpi_dev_get_resources(adev, &resource_list, | |
108 | i2c_acpi_fill_info, lookup); | |
109 | acpi_dev_free_resource_list(&resource_list); | |
110 | ||
111 | if (ret < 0 || !info->addr) | |
112 | return -EINVAL; | |
113 | ||
114 | return 0; | |
115 | } | |
116 | ||
117 | static int i2c_acpi_get_info(struct acpi_device *adev, | |
118 | struct i2c_board_info *info, | |
119 | struct i2c_adapter *adapter, | |
120 | acpi_handle *adapter_handle) | |
121 | { | |
122 | struct list_head resource_list; | |
123 | struct resource_entry *entry; | |
124 | struct i2c_acpi_lookup lookup; | |
125 | int ret; | |
126 | ||
127 | memset(&lookup, 0, sizeof(lookup)); | |
128 | lookup.info = info; | |
129 | lookup.index = -1; | |
130 | ||
131 | ret = i2c_acpi_do_lookup(adev, &lookup); | |
132 | if (ret) | |
133 | return ret; | |
134 | ||
135 | if (adapter) { | |
136 | /* The adapter must match the one in I2cSerialBus() connector */ | |
137 | if (ACPI_HANDLE(&adapter->dev) != lookup.adapter_handle) | |
138 | return -ENODEV; | |
139 | } else { | |
140 | struct acpi_device *adapter_adev; | |
141 | ||
142 | /* The adapter must be present */ | |
143 | if (acpi_bus_get_device(lookup.adapter_handle, &adapter_adev)) | |
144 | return -ENODEV; | |
145 | if (acpi_bus_get_status(adapter_adev) || | |
146 | !adapter_adev->status.present) | |
147 | return -ENODEV; | |
148 | } | |
149 | ||
150 | info->fwnode = acpi_fwnode_handle(adev); | |
151 | if (adapter_handle) | |
152 | *adapter_handle = lookup.adapter_handle; | |
153 | ||
154 | /* Then fill IRQ number if any */ | |
155 | INIT_LIST_HEAD(&resource_list); | |
156 | ret = acpi_dev_get_resources(adev, &resource_list, NULL, NULL); | |
157 | if (ret < 0) | |
158 | return -EINVAL; | |
159 | ||
160 | resource_list_for_each_entry(entry, &resource_list) { | |
161 | if (resource_type(entry->res) == IORESOURCE_IRQ) { | |
162 | info->irq = entry->res->start; | |
163 | break; | |
164 | } | |
165 | } | |
166 | ||
167 | acpi_dev_free_resource_list(&resource_list); | |
168 | ||
169 | acpi_set_modalias(adev, dev_name(&adev->dev), info->type, | |
170 | sizeof(info->type)); | |
171 | ||
172 | return 0; | |
173 | } | |
174 | ||
175 | static void i2c_acpi_register_device(struct i2c_adapter *adapter, | |
176 | struct acpi_device *adev, | |
177 | struct i2c_board_info *info) | |
178 | { | |
179 | adev->power.flags.ignore_parent = true; | |
180 | acpi_device_set_enumerated(adev); | |
181 | ||
182 | if (!i2c_new_device(adapter, info)) { | |
183 | adev->power.flags.ignore_parent = false; | |
184 | dev_err(&adapter->dev, | |
185 | "failed to add I2C device %s from ACPI\n", | |
186 | dev_name(&adev->dev)); | |
187 | } | |
188 | } | |
189 | ||
190 | static acpi_status i2c_acpi_add_device(acpi_handle handle, u32 level, | |
191 | void *data, void **return_value) | |
192 | { | |
193 | struct i2c_adapter *adapter = data; | |
194 | struct acpi_device *adev; | |
195 | struct i2c_board_info info; | |
196 | ||
197 | if (acpi_bus_get_device(handle, &adev)) | |
198 | return AE_OK; | |
199 | ||
200 | if (i2c_acpi_get_info(adev, &info, adapter, NULL)) | |
201 | return AE_OK; | |
202 | ||
203 | i2c_acpi_register_device(adapter, adev, &info); | |
204 | ||
205 | return AE_OK; | |
206 | } | |
207 | ||
208 | #define I2C_ACPI_MAX_SCAN_DEPTH 32 | |
209 | ||
210 | /** | |
211 | * i2c_acpi_register_devices - enumerate I2C slave devices behind adapter | |
212 | * @adap: pointer to adapter | |
213 | * | |
214 | * Enumerate all I2C slave devices behind this adapter by walking the ACPI | |
215 | * namespace. When a device is found it will be added to the Linux device | |
216 | * model and bound to the corresponding ACPI handle. | |
217 | */ | |
218 | void i2c_acpi_register_devices(struct i2c_adapter *adap) | |
219 | { | |
220 | acpi_status status; | |
221 | ||
222 | if (!has_acpi_companion(&adap->dev)) | |
223 | return; | |
224 | ||
225 | status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, | |
226 | I2C_ACPI_MAX_SCAN_DEPTH, | |
227 | i2c_acpi_add_device, NULL, | |
228 | adap, NULL); | |
229 | if (ACPI_FAILURE(status)) | |
230 | dev_warn(&adap->dev, "failed to enumerate I2C slaves\n"); | |
231 | } | |
232 | ||
c64ffff7 AS |
233 | const struct acpi_device_id * |
234 | i2c_acpi_match_device(const struct acpi_device_id *matches, | |
235 | struct i2c_client *client) | |
236 | { | |
237 | if (!(client && matches)) | |
238 | return NULL; | |
239 | ||
240 | return acpi_match_device(matches, &client->dev); | |
241 | } | |
242 | ||
53f8f7c5 WS |
243 | static acpi_status i2c_acpi_lookup_speed(acpi_handle handle, u32 level, |
244 | void *data, void **return_value) | |
245 | { | |
246 | struct i2c_acpi_lookup *lookup = data; | |
247 | struct acpi_device *adev; | |
248 | ||
249 | if (acpi_bus_get_device(handle, &adev)) | |
250 | return AE_OK; | |
251 | ||
252 | if (i2c_acpi_do_lookup(adev, lookup)) | |
253 | return AE_OK; | |
254 | ||
255 | if (lookup->search_handle != lookup->adapter_handle) | |
256 | return AE_OK; | |
257 | ||
258 | if (lookup->speed <= lookup->min_speed) | |
259 | lookup->min_speed = lookup->speed; | |
260 | ||
261 | return AE_OK; | |
262 | } | |
263 | ||
264 | /** | |
265 | * i2c_acpi_find_bus_speed - find I2C bus speed from ACPI | |
266 | * @dev: The device owning the bus | |
267 | * | |
268 | * Find the I2C bus speed by walking the ACPI namespace for all I2C slaves | |
269 | * devices connected to this bus and use the speed of slowest device. | |
270 | * | |
271 | * Returns the speed in Hz or zero | |
272 | */ | |
273 | u32 i2c_acpi_find_bus_speed(struct device *dev) | |
274 | { | |
275 | struct i2c_acpi_lookup lookup; | |
276 | struct i2c_board_info dummy; | |
277 | acpi_status status; | |
278 | ||
279 | if (!has_acpi_companion(dev)) | |
280 | return 0; | |
281 | ||
282 | memset(&lookup, 0, sizeof(lookup)); | |
283 | lookup.search_handle = ACPI_HANDLE(dev); | |
284 | lookup.min_speed = UINT_MAX; | |
285 | lookup.info = &dummy; | |
286 | lookup.index = -1; | |
287 | ||
288 | status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, | |
289 | I2C_ACPI_MAX_SCAN_DEPTH, | |
290 | i2c_acpi_lookup_speed, NULL, | |
291 | &lookup, NULL); | |
292 | ||
293 | if (ACPI_FAILURE(status)) { | |
294 | dev_warn(dev, "unable to find I2C bus speed from ACPI\n"); | |
295 | return 0; | |
296 | } | |
297 | ||
298 | return lookup.min_speed != UINT_MAX ? lookup.min_speed : 0; | |
299 | } | |
300 | EXPORT_SYMBOL_GPL(i2c_acpi_find_bus_speed); | |
301 | ||
c64ffff7 | 302 | static int i2c_acpi_find_match_adapter(struct device *dev, void *data) |
53f8f7c5 WS |
303 | { |
304 | struct i2c_adapter *adapter = i2c_verify_adapter(dev); | |
305 | ||
306 | if (!adapter) | |
307 | return 0; | |
308 | ||
309 | return ACPI_HANDLE(dev) == (acpi_handle)data; | |
310 | } | |
311 | ||
c64ffff7 | 312 | static int i2c_acpi_find_match_device(struct device *dev, void *data) |
53f8f7c5 WS |
313 | { |
314 | return ACPI_COMPANION(dev) == data; | |
315 | } | |
316 | ||
317 | static struct i2c_adapter *i2c_acpi_find_adapter_by_handle(acpi_handle handle) | |
318 | { | |
319 | struct device *dev; | |
320 | ||
321 | dev = bus_find_device(&i2c_bus_type, NULL, handle, | |
c64ffff7 | 322 | i2c_acpi_find_match_adapter); |
53f8f7c5 WS |
323 | return dev ? i2c_verify_adapter(dev) : NULL; |
324 | } | |
325 | ||
326 | static struct i2c_client *i2c_acpi_find_client_by_adev(struct acpi_device *adev) | |
327 | { | |
328 | struct device *dev; | |
329 | ||
c64ffff7 AS |
330 | dev = bus_find_device(&i2c_bus_type, NULL, adev, |
331 | i2c_acpi_find_match_device); | |
53f8f7c5 WS |
332 | return dev ? i2c_verify_client(dev) : NULL; |
333 | } | |
334 | ||
335 | static int i2c_acpi_notify(struct notifier_block *nb, unsigned long value, | |
336 | void *arg) | |
337 | { | |
338 | struct acpi_device *adev = arg; | |
339 | struct i2c_board_info info; | |
340 | acpi_handle adapter_handle; | |
341 | struct i2c_adapter *adapter; | |
342 | struct i2c_client *client; | |
343 | ||
344 | switch (value) { | |
345 | case ACPI_RECONFIG_DEVICE_ADD: | |
346 | if (i2c_acpi_get_info(adev, &info, NULL, &adapter_handle)) | |
347 | break; | |
348 | ||
349 | adapter = i2c_acpi_find_adapter_by_handle(adapter_handle); | |
350 | if (!adapter) | |
351 | break; | |
352 | ||
353 | i2c_acpi_register_device(adapter, adev, &info); | |
354 | break; | |
355 | case ACPI_RECONFIG_DEVICE_REMOVE: | |
356 | if (!acpi_device_enumerated(adev)) | |
357 | break; | |
358 | ||
359 | client = i2c_acpi_find_client_by_adev(adev); | |
360 | if (!client) | |
361 | break; | |
362 | ||
363 | i2c_unregister_device(client); | |
364 | put_device(&client->dev); | |
365 | break; | |
366 | } | |
367 | ||
368 | return NOTIFY_OK; | |
369 | } | |
370 | ||
371 | struct notifier_block i2c_acpi_notifier = { | |
372 | .notifier_call = i2c_acpi_notify, | |
373 | }; | |
374 | ||
375 | /** | |
376 | * i2c_acpi_new_device - Create i2c-client for the Nth I2cSerialBus resource | |
377 | * @dev: Device owning the ACPI resources to get the client from | |
378 | * @index: Index of ACPI resource to get | |
379 | * @info: describes the I2C device; note this is modified (addr gets set) | |
380 | * Context: can sleep | |
381 | * | |
382 | * By default the i2c subsys creates an i2c-client for the first I2cSerialBus | |
383 | * resource of an acpi_device, but some acpi_devices have multiple I2cSerialBus | |
384 | * resources, in that case this function can be used to create an i2c-client | |
385 | * for other I2cSerialBus resources in the Current Resource Settings table. | |
386 | * | |
387 | * Also see i2c_new_device, which this function calls to create the i2c-client. | |
388 | * | |
389 | * Returns a pointer to the new i2c-client, or NULL if the adapter is not found. | |
390 | */ | |
391 | struct i2c_client *i2c_acpi_new_device(struct device *dev, int index, | |
392 | struct i2c_board_info *info) | |
393 | { | |
394 | struct i2c_acpi_lookup lookup; | |
395 | struct i2c_adapter *adapter; | |
396 | struct acpi_device *adev; | |
397 | LIST_HEAD(resource_list); | |
398 | int ret; | |
399 | ||
400 | adev = ACPI_COMPANION(dev); | |
401 | if (!adev) | |
402 | return NULL; | |
403 | ||
404 | memset(&lookup, 0, sizeof(lookup)); | |
405 | lookup.info = info; | |
406 | lookup.device_handle = acpi_device_handle(adev); | |
407 | lookup.index = index; | |
408 | ||
409 | ret = acpi_dev_get_resources(adev, &resource_list, | |
410 | i2c_acpi_fill_info, &lookup); | |
411 | acpi_dev_free_resource_list(&resource_list); | |
412 | ||
413 | if (ret < 0 || !info->addr) | |
414 | return NULL; | |
415 | ||
416 | adapter = i2c_acpi_find_adapter_by_handle(lookup.adapter_handle); | |
417 | if (!adapter) | |
418 | return NULL; | |
419 | ||
420 | return i2c_new_device(adapter, info); | |
421 | } | |
422 | EXPORT_SYMBOL_GPL(i2c_acpi_new_device); | |
423 | ||
424 | #ifdef CONFIG_ACPI_I2C_OPREGION | |
425 | static int acpi_gsb_i2c_read_bytes(struct i2c_client *client, | |
426 | u8 cmd, u8 *data, u8 data_len) | |
427 | { | |
428 | ||
429 | struct i2c_msg msgs[2]; | |
430 | int ret; | |
431 | u8 *buffer; | |
432 | ||
433 | buffer = kzalloc(data_len, GFP_KERNEL); | |
434 | if (!buffer) | |
435 | return AE_NO_MEMORY; | |
436 | ||
437 | msgs[0].addr = client->addr; | |
438 | msgs[0].flags = client->flags; | |
439 | msgs[0].len = 1; | |
440 | msgs[0].buf = &cmd; | |
441 | ||
442 | msgs[1].addr = client->addr; | |
443 | msgs[1].flags = client->flags | I2C_M_RD; | |
444 | msgs[1].len = data_len; | |
445 | msgs[1].buf = buffer; | |
446 | ||
447 | ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs)); | |
448 | if (ret < 0) | |
449 | dev_err(&client->adapter->dev, "i2c read failed\n"); | |
450 | else | |
451 | memcpy(data, buffer, data_len); | |
452 | ||
453 | kfree(buffer); | |
454 | return ret; | |
455 | } | |
456 | ||
457 | static int acpi_gsb_i2c_write_bytes(struct i2c_client *client, | |
458 | u8 cmd, u8 *data, u8 data_len) | |
459 | { | |
460 | ||
461 | struct i2c_msg msgs[1]; | |
462 | u8 *buffer; | |
463 | int ret = AE_OK; | |
464 | ||
465 | buffer = kzalloc(data_len + 1, GFP_KERNEL); | |
466 | if (!buffer) | |
467 | return AE_NO_MEMORY; | |
468 | ||
469 | buffer[0] = cmd; | |
470 | memcpy(buffer + 1, data, data_len); | |
471 | ||
472 | msgs[0].addr = client->addr; | |
473 | msgs[0].flags = client->flags; | |
474 | msgs[0].len = data_len + 1; | |
475 | msgs[0].buf = buffer; | |
476 | ||
477 | ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs)); | |
478 | if (ret < 0) | |
479 | dev_err(&client->adapter->dev, "i2c write failed\n"); | |
480 | ||
481 | kfree(buffer); | |
482 | return ret; | |
483 | } | |
484 | ||
485 | static acpi_status | |
486 | i2c_acpi_space_handler(u32 function, acpi_physical_address command, | |
487 | u32 bits, u64 *value64, | |
488 | void *handler_context, void *region_context) | |
489 | { | |
490 | struct gsb_buffer *gsb = (struct gsb_buffer *)value64; | |
491 | struct i2c_acpi_handler_data *data = handler_context; | |
492 | struct acpi_connection_info *info = &data->info; | |
493 | struct acpi_resource_i2c_serialbus *sb; | |
494 | struct i2c_adapter *adapter = data->adapter; | |
495 | struct i2c_client *client; | |
496 | struct acpi_resource *ares; | |
497 | u32 accessor_type = function >> 16; | |
498 | u8 action = function & ACPI_IO_MASK; | |
499 | acpi_status ret; | |
500 | int status; | |
501 | ||
502 | ret = acpi_buffer_to_resource(info->connection, info->length, &ares); | |
503 | if (ACPI_FAILURE(ret)) | |
504 | return ret; | |
505 | ||
506 | client = kzalloc(sizeof(*client), GFP_KERNEL); | |
507 | if (!client) { | |
508 | ret = AE_NO_MEMORY; | |
509 | goto err; | |
510 | } | |
511 | ||
512 | if (!value64 || ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS) { | |
513 | ret = AE_BAD_PARAMETER; | |
514 | goto err; | |
515 | } | |
516 | ||
517 | sb = &ares->data.i2c_serial_bus; | |
518 | if (sb->type != ACPI_RESOURCE_SERIAL_TYPE_I2C) { | |
519 | ret = AE_BAD_PARAMETER; | |
520 | goto err; | |
521 | } | |
522 | ||
523 | client->adapter = adapter; | |
524 | client->addr = sb->slave_address; | |
525 | ||
526 | if (sb->access_mode == ACPI_I2C_10BIT_MODE) | |
527 | client->flags |= I2C_CLIENT_TEN; | |
528 | ||
529 | switch (accessor_type) { | |
530 | case ACPI_GSB_ACCESS_ATTRIB_SEND_RCV: | |
531 | if (action == ACPI_READ) { | |
532 | status = i2c_smbus_read_byte(client); | |
533 | if (status >= 0) { | |
534 | gsb->bdata = status; | |
535 | status = 0; | |
536 | } | |
537 | } else { | |
538 | status = i2c_smbus_write_byte(client, gsb->bdata); | |
539 | } | |
540 | break; | |
541 | ||
542 | case ACPI_GSB_ACCESS_ATTRIB_BYTE: | |
543 | if (action == ACPI_READ) { | |
544 | status = i2c_smbus_read_byte_data(client, command); | |
545 | if (status >= 0) { | |
546 | gsb->bdata = status; | |
547 | status = 0; | |
548 | } | |
549 | } else { | |
550 | status = i2c_smbus_write_byte_data(client, command, | |
551 | gsb->bdata); | |
552 | } | |
553 | break; | |
554 | ||
555 | case ACPI_GSB_ACCESS_ATTRIB_WORD: | |
556 | if (action == ACPI_READ) { | |
557 | status = i2c_smbus_read_word_data(client, command); | |
558 | if (status >= 0) { | |
559 | gsb->wdata = status; | |
560 | status = 0; | |
561 | } | |
562 | } else { | |
563 | status = i2c_smbus_write_word_data(client, command, | |
564 | gsb->wdata); | |
565 | } | |
566 | break; | |
567 | ||
568 | case ACPI_GSB_ACCESS_ATTRIB_BLOCK: | |
569 | if (action == ACPI_READ) { | |
570 | status = i2c_smbus_read_block_data(client, command, | |
571 | gsb->data); | |
572 | if (status >= 0) { | |
573 | gsb->len = status; | |
574 | status = 0; | |
575 | } | |
576 | } else { | |
577 | status = i2c_smbus_write_block_data(client, command, | |
578 | gsb->len, gsb->data); | |
579 | } | |
580 | break; | |
581 | ||
582 | case ACPI_GSB_ACCESS_ATTRIB_MULTIBYTE: | |
583 | if (action == ACPI_READ) { | |
584 | status = acpi_gsb_i2c_read_bytes(client, command, | |
585 | gsb->data, info->access_length); | |
586 | if (status > 0) | |
587 | status = 0; | |
588 | } else { | |
589 | status = acpi_gsb_i2c_write_bytes(client, command, | |
590 | gsb->data, info->access_length); | |
591 | } | |
592 | break; | |
593 | ||
594 | default: | |
595 | dev_warn(&adapter->dev, "protocol 0x%02x not supported for client 0x%02x\n", | |
596 | accessor_type, client->addr); | |
597 | ret = AE_BAD_PARAMETER; | |
598 | goto err; | |
599 | } | |
600 | ||
601 | gsb->status = status; | |
602 | ||
603 | err: | |
604 | kfree(client); | |
605 | ACPI_FREE(ares); | |
606 | return ret; | |
607 | } | |
608 | ||
609 | ||
610 | int i2c_acpi_install_space_handler(struct i2c_adapter *adapter) | |
611 | { | |
612 | acpi_handle handle; | |
613 | struct i2c_acpi_handler_data *data; | |
614 | acpi_status status; | |
615 | ||
616 | if (!adapter->dev.parent) | |
617 | return -ENODEV; | |
618 | ||
619 | handle = ACPI_HANDLE(adapter->dev.parent); | |
620 | ||
621 | if (!handle) | |
622 | return -ENODEV; | |
623 | ||
624 | data = kzalloc(sizeof(struct i2c_acpi_handler_data), | |
625 | GFP_KERNEL); | |
626 | if (!data) | |
627 | return -ENOMEM; | |
628 | ||
629 | data->adapter = adapter; | |
630 | status = acpi_bus_attach_private_data(handle, (void *)data); | |
631 | if (ACPI_FAILURE(status)) { | |
632 | kfree(data); | |
633 | return -ENOMEM; | |
634 | } | |
635 | ||
636 | status = acpi_install_address_space_handler(handle, | |
637 | ACPI_ADR_SPACE_GSBUS, | |
638 | &i2c_acpi_space_handler, | |
639 | NULL, | |
640 | data); | |
641 | if (ACPI_FAILURE(status)) { | |
642 | dev_err(&adapter->dev, "Error installing i2c space handler\n"); | |
643 | acpi_bus_detach_private_data(handle); | |
644 | kfree(data); | |
645 | return -ENOMEM; | |
646 | } | |
647 | ||
648 | acpi_walk_dep_device_list(handle); | |
649 | return 0; | |
650 | } | |
651 | ||
652 | void i2c_acpi_remove_space_handler(struct i2c_adapter *adapter) | |
653 | { | |
654 | acpi_handle handle; | |
655 | struct i2c_acpi_handler_data *data; | |
656 | acpi_status status; | |
657 | ||
658 | if (!adapter->dev.parent) | |
659 | return; | |
660 | ||
661 | handle = ACPI_HANDLE(adapter->dev.parent); | |
662 | ||
663 | if (!handle) | |
664 | return; | |
665 | ||
666 | acpi_remove_address_space_handler(handle, | |
667 | ACPI_ADR_SPACE_GSBUS, | |
668 | &i2c_acpi_space_handler); | |
669 | ||
670 | status = acpi_bus_get_private_data(handle, (void **)&data); | |
671 | if (ACPI_SUCCESS(status)) | |
672 | kfree(data); | |
673 | ||
674 | acpi_bus_detach_private_data(handle); | |
675 | } | |
676 | #endif /* CONFIG_ACPI_I2C_OPREGION */ |