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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 | ||
0d5102fe AS |
48 | /** |
49 | * i2c_acpi_get_i2c_resource - Gets I2cSerialBus resource if type matches | |
50 | * @ares: ACPI resource | |
51 | * @i2c: Pointer to I2cSerialBus resource will be returned here | |
52 | * | |
53 | * Checks if the given ACPI resource is of type I2cSerialBus. | |
54 | * In this case, returns a pointer to it to the caller. | |
55 | * | |
56 | * Returns true if resource type is of I2cSerialBus, otherwise false. | |
57 | */ | |
58 | bool i2c_acpi_get_i2c_resource(struct acpi_resource *ares, | |
59 | struct acpi_resource_i2c_serialbus **i2c) | |
60 | { | |
61 | struct acpi_resource_i2c_serialbus *sb; | |
62 | ||
63 | if (ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS) | |
64 | return false; | |
65 | ||
66 | sb = &ares->data.i2c_serial_bus; | |
67 | if (sb->type != ACPI_RESOURCE_SERIAL_TYPE_I2C) | |
68 | return false; | |
69 | ||
70 | *i2c = sb; | |
71 | return true; | |
72 | } | |
73 | EXPORT_SYMBOL_GPL(i2c_acpi_get_i2c_resource); | |
74 | ||
53f8f7c5 WS |
75 | static int i2c_acpi_fill_info(struct acpi_resource *ares, void *data) |
76 | { | |
77 | struct i2c_acpi_lookup *lookup = data; | |
78 | struct i2c_board_info *info = lookup->info; | |
79 | struct acpi_resource_i2c_serialbus *sb; | |
80 | acpi_status status; | |
81 | ||
0d5102fe | 82 | if (info->addr || !i2c_acpi_get_i2c_resource(ares, &sb)) |
53f8f7c5 WS |
83 | return 1; |
84 | ||
85 | if (lookup->index != -1 && lookup->n++ != lookup->index) | |
86 | return 1; | |
87 | ||
88 | status = acpi_get_handle(lookup->device_handle, | |
89 | sb->resource_source.string_ptr, | |
90 | &lookup->adapter_handle); | |
5f59d6a1 | 91 | if (ACPI_FAILURE(status)) |
53f8f7c5 WS |
92 | return 1; |
93 | ||
94 | info->addr = sb->slave_address; | |
95 | lookup->speed = sb->connection_speed; | |
96 | if (sb->access_mode == ACPI_I2C_10BIT_MODE) | |
97 | info->flags |= I2C_CLIENT_TEN; | |
98 | ||
99 | return 1; | |
100 | } | |
101 | ||
3a4991a9 HG |
102 | static const struct acpi_device_id i2c_acpi_ignored_device_ids[] = { |
103 | /* | |
104 | * ACPI video acpi_devices, which are handled by the acpi-video driver | |
105 | * sometimes contain a SERIAL_TYPE_I2C ACPI resource, ignore these. | |
106 | */ | |
107 | { ACPI_VIDEO_HID, 0 }, | |
108 | {} | |
109 | }; | |
110 | ||
53f8f7c5 WS |
111 | static int i2c_acpi_do_lookup(struct acpi_device *adev, |
112 | struct i2c_acpi_lookup *lookup) | |
113 | { | |
114 | struct i2c_board_info *info = lookup->info; | |
115 | struct list_head resource_list; | |
116 | int ret; | |
117 | ||
118 | if (acpi_bus_get_status(adev) || !adev->status.present || | |
119 | acpi_device_enumerated(adev)) | |
120 | return -EINVAL; | |
121 | ||
3a4991a9 HG |
122 | if (acpi_match_device_ids(adev, i2c_acpi_ignored_device_ids) == 0) |
123 | return -ENODEV; | |
124 | ||
53f8f7c5 WS |
125 | memset(info, 0, sizeof(*info)); |
126 | lookup->device_handle = acpi_device_handle(adev); | |
127 | ||
128 | /* Look up for I2cSerialBus resource */ | |
129 | INIT_LIST_HEAD(&resource_list); | |
130 | ret = acpi_dev_get_resources(adev, &resource_list, | |
131 | i2c_acpi_fill_info, lookup); | |
132 | acpi_dev_free_resource_list(&resource_list); | |
133 | ||
134 | if (ret < 0 || !info->addr) | |
135 | return -EINVAL; | |
136 | ||
137 | return 0; | |
138 | } | |
139 | ||
140 | static int i2c_acpi_get_info(struct acpi_device *adev, | |
141 | struct i2c_board_info *info, | |
142 | struct i2c_adapter *adapter, | |
143 | acpi_handle *adapter_handle) | |
144 | { | |
145 | struct list_head resource_list; | |
146 | struct resource_entry *entry; | |
147 | struct i2c_acpi_lookup lookup; | |
148 | int ret; | |
149 | ||
150 | memset(&lookup, 0, sizeof(lookup)); | |
151 | lookup.info = info; | |
152 | lookup.index = -1; | |
153 | ||
154 | ret = i2c_acpi_do_lookup(adev, &lookup); | |
155 | if (ret) | |
156 | return ret; | |
157 | ||
158 | if (adapter) { | |
159 | /* The adapter must match the one in I2cSerialBus() connector */ | |
160 | if (ACPI_HANDLE(&adapter->dev) != lookup.adapter_handle) | |
161 | return -ENODEV; | |
162 | } else { | |
163 | struct acpi_device *adapter_adev; | |
164 | ||
165 | /* The adapter must be present */ | |
166 | if (acpi_bus_get_device(lookup.adapter_handle, &adapter_adev)) | |
167 | return -ENODEV; | |
168 | if (acpi_bus_get_status(adapter_adev) || | |
169 | !adapter_adev->status.present) | |
170 | return -ENODEV; | |
171 | } | |
172 | ||
173 | info->fwnode = acpi_fwnode_handle(adev); | |
174 | if (adapter_handle) | |
175 | *adapter_handle = lookup.adapter_handle; | |
176 | ||
177 | /* Then fill IRQ number if any */ | |
178 | INIT_LIST_HEAD(&resource_list); | |
179 | ret = acpi_dev_get_resources(adev, &resource_list, NULL, NULL); | |
180 | if (ret < 0) | |
181 | return -EINVAL; | |
182 | ||
183 | resource_list_for_each_entry(entry, &resource_list) { | |
184 | if (resource_type(entry->res) == IORESOURCE_IRQ) { | |
185 | info->irq = entry->res->start; | |
186 | break; | |
187 | } | |
188 | } | |
189 | ||
190 | acpi_dev_free_resource_list(&resource_list); | |
191 | ||
192 | acpi_set_modalias(adev, dev_name(&adev->dev), info->type, | |
193 | sizeof(info->type)); | |
194 | ||
195 | return 0; | |
196 | } | |
197 | ||
198 | static void i2c_acpi_register_device(struct i2c_adapter *adapter, | |
199 | struct acpi_device *adev, | |
200 | struct i2c_board_info *info) | |
201 | { | |
202 | adev->power.flags.ignore_parent = true; | |
203 | acpi_device_set_enumerated(adev); | |
204 | ||
205 | if (!i2c_new_device(adapter, info)) { | |
206 | adev->power.flags.ignore_parent = false; | |
207 | dev_err(&adapter->dev, | |
208 | "failed to add I2C device %s from ACPI\n", | |
209 | dev_name(&adev->dev)); | |
210 | } | |
211 | } | |
212 | ||
213 | static acpi_status i2c_acpi_add_device(acpi_handle handle, u32 level, | |
214 | void *data, void **return_value) | |
215 | { | |
216 | struct i2c_adapter *adapter = data; | |
217 | struct acpi_device *adev; | |
218 | struct i2c_board_info info; | |
219 | ||
220 | if (acpi_bus_get_device(handle, &adev)) | |
221 | return AE_OK; | |
222 | ||
223 | if (i2c_acpi_get_info(adev, &info, adapter, NULL)) | |
224 | return AE_OK; | |
225 | ||
226 | i2c_acpi_register_device(adapter, adev, &info); | |
227 | ||
228 | return AE_OK; | |
229 | } | |
230 | ||
231 | #define I2C_ACPI_MAX_SCAN_DEPTH 32 | |
232 | ||
233 | /** | |
234 | * i2c_acpi_register_devices - enumerate I2C slave devices behind adapter | |
235 | * @adap: pointer to adapter | |
236 | * | |
237 | * Enumerate all I2C slave devices behind this adapter by walking the ACPI | |
238 | * namespace. When a device is found it will be added to the Linux device | |
239 | * model and bound to the corresponding ACPI handle. | |
240 | */ | |
241 | void i2c_acpi_register_devices(struct i2c_adapter *adap) | |
242 | { | |
243 | acpi_status status; | |
244 | ||
245 | if (!has_acpi_companion(&adap->dev)) | |
246 | return; | |
247 | ||
248 | status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, | |
249 | I2C_ACPI_MAX_SCAN_DEPTH, | |
250 | i2c_acpi_add_device, NULL, | |
251 | adap, NULL); | |
252 | if (ACPI_FAILURE(status)) | |
253 | dev_warn(&adap->dev, "failed to enumerate I2C slaves\n"); | |
254 | } | |
255 | ||
c64ffff7 AS |
256 | const struct acpi_device_id * |
257 | i2c_acpi_match_device(const struct acpi_device_id *matches, | |
258 | struct i2c_client *client) | |
259 | { | |
260 | if (!(client && matches)) | |
261 | return NULL; | |
262 | ||
263 | return acpi_match_device(matches, &client->dev); | |
264 | } | |
265 | ||
53f8f7c5 WS |
266 | static acpi_status i2c_acpi_lookup_speed(acpi_handle handle, u32 level, |
267 | void *data, void **return_value) | |
268 | { | |
269 | struct i2c_acpi_lookup *lookup = data; | |
270 | struct acpi_device *adev; | |
271 | ||
272 | if (acpi_bus_get_device(handle, &adev)) | |
273 | return AE_OK; | |
274 | ||
275 | if (i2c_acpi_do_lookup(adev, lookup)) | |
276 | return AE_OK; | |
277 | ||
278 | if (lookup->search_handle != lookup->adapter_handle) | |
279 | return AE_OK; | |
280 | ||
281 | if (lookup->speed <= lookup->min_speed) | |
282 | lookup->min_speed = lookup->speed; | |
283 | ||
284 | return AE_OK; | |
285 | } | |
286 | ||
287 | /** | |
288 | * i2c_acpi_find_bus_speed - find I2C bus speed from ACPI | |
289 | * @dev: The device owning the bus | |
290 | * | |
291 | * Find the I2C bus speed by walking the ACPI namespace for all I2C slaves | |
292 | * devices connected to this bus and use the speed of slowest device. | |
293 | * | |
294 | * Returns the speed in Hz or zero | |
295 | */ | |
296 | u32 i2c_acpi_find_bus_speed(struct device *dev) | |
297 | { | |
298 | struct i2c_acpi_lookup lookup; | |
299 | struct i2c_board_info dummy; | |
300 | acpi_status status; | |
301 | ||
302 | if (!has_acpi_companion(dev)) | |
303 | return 0; | |
304 | ||
305 | memset(&lookup, 0, sizeof(lookup)); | |
306 | lookup.search_handle = ACPI_HANDLE(dev); | |
307 | lookup.min_speed = UINT_MAX; | |
308 | lookup.info = &dummy; | |
309 | lookup.index = -1; | |
310 | ||
311 | status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, | |
312 | I2C_ACPI_MAX_SCAN_DEPTH, | |
313 | i2c_acpi_lookup_speed, NULL, | |
314 | &lookup, NULL); | |
315 | ||
316 | if (ACPI_FAILURE(status)) { | |
317 | dev_warn(dev, "unable to find I2C bus speed from ACPI\n"); | |
318 | return 0; | |
319 | } | |
320 | ||
321 | return lookup.min_speed != UINT_MAX ? lookup.min_speed : 0; | |
322 | } | |
323 | EXPORT_SYMBOL_GPL(i2c_acpi_find_bus_speed); | |
324 | ||
c64ffff7 | 325 | static int i2c_acpi_find_match_adapter(struct device *dev, void *data) |
53f8f7c5 WS |
326 | { |
327 | struct i2c_adapter *adapter = i2c_verify_adapter(dev); | |
328 | ||
329 | if (!adapter) | |
330 | return 0; | |
331 | ||
332 | return ACPI_HANDLE(dev) == (acpi_handle)data; | |
333 | } | |
334 | ||
c64ffff7 | 335 | static int i2c_acpi_find_match_device(struct device *dev, void *data) |
53f8f7c5 WS |
336 | { |
337 | return ACPI_COMPANION(dev) == data; | |
338 | } | |
339 | ||
340 | static struct i2c_adapter *i2c_acpi_find_adapter_by_handle(acpi_handle handle) | |
341 | { | |
342 | struct device *dev; | |
343 | ||
344 | dev = bus_find_device(&i2c_bus_type, NULL, handle, | |
c64ffff7 | 345 | i2c_acpi_find_match_adapter); |
53f8f7c5 WS |
346 | return dev ? i2c_verify_adapter(dev) : NULL; |
347 | } | |
348 | ||
349 | static struct i2c_client *i2c_acpi_find_client_by_adev(struct acpi_device *adev) | |
350 | { | |
351 | struct device *dev; | |
352 | ||
c64ffff7 AS |
353 | dev = bus_find_device(&i2c_bus_type, NULL, adev, |
354 | i2c_acpi_find_match_device); | |
53f8f7c5 WS |
355 | return dev ? i2c_verify_client(dev) : NULL; |
356 | } | |
357 | ||
358 | static int i2c_acpi_notify(struct notifier_block *nb, unsigned long value, | |
359 | void *arg) | |
360 | { | |
361 | struct acpi_device *adev = arg; | |
362 | struct i2c_board_info info; | |
363 | acpi_handle adapter_handle; | |
364 | struct i2c_adapter *adapter; | |
365 | struct i2c_client *client; | |
366 | ||
367 | switch (value) { | |
368 | case ACPI_RECONFIG_DEVICE_ADD: | |
369 | if (i2c_acpi_get_info(adev, &info, NULL, &adapter_handle)) | |
370 | break; | |
371 | ||
372 | adapter = i2c_acpi_find_adapter_by_handle(adapter_handle); | |
373 | if (!adapter) | |
374 | break; | |
375 | ||
376 | i2c_acpi_register_device(adapter, adev, &info); | |
377 | break; | |
378 | case ACPI_RECONFIG_DEVICE_REMOVE: | |
379 | if (!acpi_device_enumerated(adev)) | |
380 | break; | |
381 | ||
382 | client = i2c_acpi_find_client_by_adev(adev); | |
383 | if (!client) | |
384 | break; | |
385 | ||
386 | i2c_unregister_device(client); | |
387 | put_device(&client->dev); | |
388 | break; | |
389 | } | |
390 | ||
391 | return NOTIFY_OK; | |
392 | } | |
393 | ||
394 | struct notifier_block i2c_acpi_notifier = { | |
395 | .notifier_call = i2c_acpi_notify, | |
396 | }; | |
397 | ||
398 | /** | |
399 | * i2c_acpi_new_device - Create i2c-client for the Nth I2cSerialBus resource | |
400 | * @dev: Device owning the ACPI resources to get the client from | |
401 | * @index: Index of ACPI resource to get | |
402 | * @info: describes the I2C device; note this is modified (addr gets set) | |
403 | * Context: can sleep | |
404 | * | |
405 | * By default the i2c subsys creates an i2c-client for the first I2cSerialBus | |
406 | * resource of an acpi_device, but some acpi_devices have multiple I2cSerialBus | |
407 | * resources, in that case this function can be used to create an i2c-client | |
408 | * for other I2cSerialBus resources in the Current Resource Settings table. | |
409 | * | |
410 | * Also see i2c_new_device, which this function calls to create the i2c-client. | |
411 | * | |
2dea645f AS |
412 | * Returns a pointer to the new i2c-client, or error pointer in case of failure. |
413 | * Specifically, -EPROBE_DEFER is returned if the adapter is not found. | |
53f8f7c5 WS |
414 | */ |
415 | struct i2c_client *i2c_acpi_new_device(struct device *dev, int index, | |
416 | struct i2c_board_info *info) | |
417 | { | |
418 | struct i2c_acpi_lookup lookup; | |
419 | struct i2c_adapter *adapter; | |
2dea645f | 420 | struct i2c_client *client; |
53f8f7c5 WS |
421 | struct acpi_device *adev; |
422 | LIST_HEAD(resource_list); | |
423 | int ret; | |
424 | ||
425 | adev = ACPI_COMPANION(dev); | |
426 | if (!adev) | |
2dea645f | 427 | return ERR_PTR(-EINVAL); |
53f8f7c5 WS |
428 | |
429 | memset(&lookup, 0, sizeof(lookup)); | |
430 | lookup.info = info; | |
431 | lookup.device_handle = acpi_device_handle(adev); | |
432 | lookup.index = index; | |
433 | ||
434 | ret = acpi_dev_get_resources(adev, &resource_list, | |
435 | i2c_acpi_fill_info, &lookup); | |
2dea645f AS |
436 | if (ret < 0) |
437 | return ERR_PTR(ret); | |
438 | ||
53f8f7c5 WS |
439 | acpi_dev_free_resource_list(&resource_list); |
440 | ||
2dea645f AS |
441 | if (!info->addr) |
442 | return ERR_PTR(-EADDRNOTAVAIL); | |
53f8f7c5 WS |
443 | |
444 | adapter = i2c_acpi_find_adapter_by_handle(lookup.adapter_handle); | |
445 | if (!adapter) | |
2dea645f AS |
446 | return ERR_PTR(-EPROBE_DEFER); |
447 | ||
448 | client = i2c_new_device(adapter, info); | |
449 | if (!client) | |
450 | return ERR_PTR(-ENODEV); | |
53f8f7c5 | 451 | |
2dea645f | 452 | return client; |
53f8f7c5 WS |
453 | } |
454 | EXPORT_SYMBOL_GPL(i2c_acpi_new_device); | |
455 | ||
456 | #ifdef CONFIG_ACPI_I2C_OPREGION | |
457 | static int acpi_gsb_i2c_read_bytes(struct i2c_client *client, | |
458 | u8 cmd, u8 *data, u8 data_len) | |
459 | { | |
460 | ||
461 | struct i2c_msg msgs[2]; | |
462 | int ret; | |
463 | u8 *buffer; | |
464 | ||
465 | buffer = kzalloc(data_len, GFP_KERNEL); | |
466 | if (!buffer) | |
467 | return AE_NO_MEMORY; | |
468 | ||
469 | msgs[0].addr = client->addr; | |
470 | msgs[0].flags = client->flags; | |
471 | msgs[0].len = 1; | |
472 | msgs[0].buf = &cmd; | |
473 | ||
474 | msgs[1].addr = client->addr; | |
475 | msgs[1].flags = client->flags | I2C_M_RD; | |
476 | msgs[1].len = data_len; | |
477 | msgs[1].buf = buffer; | |
478 | ||
479 | ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs)); | |
7781edae HG |
480 | if (ret < 0) { |
481 | /* Getting a NACK is unfortunately normal with some DSTDs */ | |
482 | if (ret == -EREMOTEIO) | |
483 | dev_dbg(&client->adapter->dev, "i2c read %d bytes from client@%#x starting at reg %#x failed, error: %d\n", | |
484 | data_len, client->addr, cmd, ret); | |
485 | else | |
486 | dev_err(&client->adapter->dev, "i2c read %d bytes from client@%#x starting at reg %#x failed, error: %d\n", | |
487 | data_len, client->addr, cmd, ret); | |
0a30446c HG |
488 | /* 2 transfers must have completed successfully */ |
489 | } else if (ret == 2) { | |
53f8f7c5 | 490 | memcpy(data, buffer, data_len); |
0a30446c HG |
491 | ret = 0; |
492 | } else { | |
493 | ret = -EIO; | |
7781edae | 494 | } |
53f8f7c5 WS |
495 | |
496 | kfree(buffer); | |
497 | return ret; | |
498 | } | |
499 | ||
500 | static int acpi_gsb_i2c_write_bytes(struct i2c_client *client, | |
501 | u8 cmd, u8 *data, u8 data_len) | |
502 | { | |
503 | ||
504 | struct i2c_msg msgs[1]; | |
505 | u8 *buffer; | |
506 | int ret = AE_OK; | |
507 | ||
508 | buffer = kzalloc(data_len + 1, GFP_KERNEL); | |
509 | if (!buffer) | |
510 | return AE_NO_MEMORY; | |
511 | ||
512 | buffer[0] = cmd; | |
513 | memcpy(buffer + 1, data, data_len); | |
514 | ||
515 | msgs[0].addr = client->addr; | |
516 | msgs[0].flags = client->flags; | |
517 | msgs[0].len = data_len + 1; | |
518 | msgs[0].buf = buffer; | |
519 | ||
520 | ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs)); | |
53f8f7c5 WS |
521 | |
522 | kfree(buffer); | |
c463a158 HG |
523 | |
524 | if (ret < 0) { | |
525 | dev_err(&client->adapter->dev, "i2c write failed: %d\n", ret); | |
526 | return ret; | |
527 | } | |
528 | ||
529 | /* 1 transfer must have completed successfully */ | |
530 | return (ret == 1) ? 0 : -EIO; | |
53f8f7c5 WS |
531 | } |
532 | ||
533 | static acpi_status | |
534 | i2c_acpi_space_handler(u32 function, acpi_physical_address command, | |
535 | u32 bits, u64 *value64, | |
536 | void *handler_context, void *region_context) | |
537 | { | |
538 | struct gsb_buffer *gsb = (struct gsb_buffer *)value64; | |
539 | struct i2c_acpi_handler_data *data = handler_context; | |
540 | struct acpi_connection_info *info = &data->info; | |
541 | struct acpi_resource_i2c_serialbus *sb; | |
542 | struct i2c_adapter *adapter = data->adapter; | |
543 | struct i2c_client *client; | |
544 | struct acpi_resource *ares; | |
545 | u32 accessor_type = function >> 16; | |
546 | u8 action = function & ACPI_IO_MASK; | |
547 | acpi_status ret; | |
548 | int status; | |
549 | ||
550 | ret = acpi_buffer_to_resource(info->connection, info->length, &ares); | |
551 | if (ACPI_FAILURE(ret)) | |
552 | return ret; | |
553 | ||
554 | client = kzalloc(sizeof(*client), GFP_KERNEL); | |
555 | if (!client) { | |
556 | ret = AE_NO_MEMORY; | |
557 | goto err; | |
558 | } | |
559 | ||
0d5102fe | 560 | if (!value64 || !i2c_acpi_get_i2c_resource(ares, &sb)) { |
53f8f7c5 WS |
561 | ret = AE_BAD_PARAMETER; |
562 | goto err; | |
563 | } | |
564 | ||
565 | client->adapter = adapter; | |
566 | client->addr = sb->slave_address; | |
567 | ||
568 | if (sb->access_mode == ACPI_I2C_10BIT_MODE) | |
569 | client->flags |= I2C_CLIENT_TEN; | |
570 | ||
571 | switch (accessor_type) { | |
572 | case ACPI_GSB_ACCESS_ATTRIB_SEND_RCV: | |
573 | if (action == ACPI_READ) { | |
574 | status = i2c_smbus_read_byte(client); | |
575 | if (status >= 0) { | |
576 | gsb->bdata = status; | |
577 | status = 0; | |
578 | } | |
579 | } else { | |
580 | status = i2c_smbus_write_byte(client, gsb->bdata); | |
581 | } | |
582 | break; | |
583 | ||
584 | case ACPI_GSB_ACCESS_ATTRIB_BYTE: | |
585 | if (action == ACPI_READ) { | |
586 | status = i2c_smbus_read_byte_data(client, command); | |
587 | if (status >= 0) { | |
588 | gsb->bdata = status; | |
589 | status = 0; | |
590 | } | |
591 | } else { | |
592 | status = i2c_smbus_write_byte_data(client, command, | |
593 | gsb->bdata); | |
594 | } | |
595 | break; | |
596 | ||
597 | case ACPI_GSB_ACCESS_ATTRIB_WORD: | |
598 | if (action == ACPI_READ) { | |
599 | status = i2c_smbus_read_word_data(client, command); | |
600 | if (status >= 0) { | |
601 | gsb->wdata = status; | |
602 | status = 0; | |
603 | } | |
604 | } else { | |
605 | status = i2c_smbus_write_word_data(client, command, | |
606 | gsb->wdata); | |
607 | } | |
608 | break; | |
609 | ||
610 | case ACPI_GSB_ACCESS_ATTRIB_BLOCK: | |
611 | if (action == ACPI_READ) { | |
612 | status = i2c_smbus_read_block_data(client, command, | |
613 | gsb->data); | |
614 | if (status >= 0) { | |
615 | gsb->len = status; | |
616 | status = 0; | |
617 | } | |
618 | } else { | |
619 | status = i2c_smbus_write_block_data(client, command, | |
620 | gsb->len, gsb->data); | |
621 | } | |
622 | break; | |
623 | ||
624 | case ACPI_GSB_ACCESS_ATTRIB_MULTIBYTE: | |
625 | if (action == ACPI_READ) { | |
626 | status = acpi_gsb_i2c_read_bytes(client, command, | |
627 | gsb->data, info->access_length); | |
53f8f7c5 WS |
628 | } else { |
629 | status = acpi_gsb_i2c_write_bytes(client, command, | |
630 | gsb->data, info->access_length); | |
631 | } | |
632 | break; | |
633 | ||
634 | default: | |
635 | dev_warn(&adapter->dev, "protocol 0x%02x not supported for client 0x%02x\n", | |
636 | accessor_type, client->addr); | |
637 | ret = AE_BAD_PARAMETER; | |
638 | goto err; | |
639 | } | |
640 | ||
641 | gsb->status = status; | |
642 | ||
643 | err: | |
644 | kfree(client); | |
645 | ACPI_FREE(ares); | |
646 | return ret; | |
647 | } | |
648 | ||
649 | ||
650 | int i2c_acpi_install_space_handler(struct i2c_adapter *adapter) | |
651 | { | |
652 | acpi_handle handle; | |
653 | struct i2c_acpi_handler_data *data; | |
654 | acpi_status status; | |
655 | ||
656 | if (!adapter->dev.parent) | |
657 | return -ENODEV; | |
658 | ||
659 | handle = ACPI_HANDLE(adapter->dev.parent); | |
660 | ||
661 | if (!handle) | |
662 | return -ENODEV; | |
663 | ||
664 | data = kzalloc(sizeof(struct i2c_acpi_handler_data), | |
665 | GFP_KERNEL); | |
666 | if (!data) | |
667 | return -ENOMEM; | |
668 | ||
669 | data->adapter = adapter; | |
670 | status = acpi_bus_attach_private_data(handle, (void *)data); | |
671 | if (ACPI_FAILURE(status)) { | |
672 | kfree(data); | |
673 | return -ENOMEM; | |
674 | } | |
675 | ||
676 | status = acpi_install_address_space_handler(handle, | |
677 | ACPI_ADR_SPACE_GSBUS, | |
678 | &i2c_acpi_space_handler, | |
679 | NULL, | |
680 | data); | |
681 | if (ACPI_FAILURE(status)) { | |
682 | dev_err(&adapter->dev, "Error installing i2c space handler\n"); | |
683 | acpi_bus_detach_private_data(handle); | |
684 | kfree(data); | |
685 | return -ENOMEM; | |
686 | } | |
687 | ||
688 | acpi_walk_dep_device_list(handle); | |
689 | return 0; | |
690 | } | |
691 | ||
692 | void i2c_acpi_remove_space_handler(struct i2c_adapter *adapter) | |
693 | { | |
694 | acpi_handle handle; | |
695 | struct i2c_acpi_handler_data *data; | |
696 | acpi_status status; | |
697 | ||
698 | if (!adapter->dev.parent) | |
699 | return; | |
700 | ||
701 | handle = ACPI_HANDLE(adapter->dev.parent); | |
702 | ||
703 | if (!handle) | |
704 | return; | |
705 | ||
706 | acpi_remove_address_space_handler(handle, | |
707 | ACPI_ADR_SPACE_GSBUS, | |
708 | &i2c_acpi_space_handler); | |
709 | ||
710 | status = acpi_bus_get_private_data(handle, (void **)&data); | |
711 | if (ACPI_SUCCESS(status)) | |
712 | kfree(data); | |
713 | ||
714 | acpi_bus_detach_private_data(handle); | |
715 | } | |
716 | #endif /* CONFIG_ACPI_I2C_OPREGION */ |