Commit | Line | Data |
---|---|---|
2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
53f8f7c5 WS |
2 | /* |
3 | * Linux I2C core ACPI support code | |
4 | * | |
5 | * Copyright (C) 2014 Intel Corp, Author: Lan Tianyu <tianyu.lan@intel.com> | |
53f8f7c5 WS |
6 | */ |
7 | ||
8 | #include <linux/acpi.h> | |
9 | #include <linux/device.h> | |
10 | #include <linux/err.h> | |
11 | #include <linux/i2c.h> | |
12 | #include <linux/list.h> | |
13 | #include <linux/module.h> | |
14 | #include <linux/slab.h> | |
15 | ||
16 | #include "i2c-core.h" | |
17 | ||
18 | struct i2c_acpi_handler_data { | |
19 | struct acpi_connection_info info; | |
20 | struct i2c_adapter *adapter; | |
21 | }; | |
22 | ||
23 | struct gsb_buffer { | |
24 | u8 status; | |
25 | u8 len; | |
26 | union { | |
27 | u16 wdata; | |
28 | u8 bdata; | |
29 | u8 data[0]; | |
30 | }; | |
31 | } __packed; | |
32 | ||
33 | struct i2c_acpi_lookup { | |
34 | struct i2c_board_info *info; | |
35 | acpi_handle adapter_handle; | |
36 | acpi_handle device_handle; | |
37 | acpi_handle search_handle; | |
38 | int n; | |
39 | int index; | |
40 | u32 speed; | |
41 | u32 min_speed; | |
42 | }; | |
43 | ||
0d5102fe AS |
44 | /** |
45 | * i2c_acpi_get_i2c_resource - Gets I2cSerialBus resource if type matches | |
46 | * @ares: ACPI resource | |
47 | * @i2c: Pointer to I2cSerialBus resource will be returned here | |
48 | * | |
49 | * Checks if the given ACPI resource is of type I2cSerialBus. | |
50 | * In this case, returns a pointer to it to the caller. | |
51 | * | |
52 | * Returns true if resource type is of I2cSerialBus, otherwise false. | |
53 | */ | |
54 | bool i2c_acpi_get_i2c_resource(struct acpi_resource *ares, | |
55 | struct acpi_resource_i2c_serialbus **i2c) | |
56 | { | |
57 | struct acpi_resource_i2c_serialbus *sb; | |
58 | ||
59 | if (ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS) | |
60 | return false; | |
61 | ||
62 | sb = &ares->data.i2c_serial_bus; | |
63 | if (sb->type != ACPI_RESOURCE_SERIAL_TYPE_I2C) | |
64 | return false; | |
65 | ||
66 | *i2c = sb; | |
67 | return true; | |
68 | } | |
69 | EXPORT_SYMBOL_GPL(i2c_acpi_get_i2c_resource); | |
70 | ||
53f8f7c5 WS |
71 | static int i2c_acpi_fill_info(struct acpi_resource *ares, void *data) |
72 | { | |
73 | struct i2c_acpi_lookup *lookup = data; | |
74 | struct i2c_board_info *info = lookup->info; | |
75 | struct acpi_resource_i2c_serialbus *sb; | |
76 | acpi_status status; | |
77 | ||
0d5102fe | 78 | if (info->addr || !i2c_acpi_get_i2c_resource(ares, &sb)) |
53f8f7c5 WS |
79 | return 1; |
80 | ||
81 | if (lookup->index != -1 && lookup->n++ != lookup->index) | |
82 | return 1; | |
83 | ||
84 | status = acpi_get_handle(lookup->device_handle, | |
85 | sb->resource_source.string_ptr, | |
86 | &lookup->adapter_handle); | |
5f59d6a1 | 87 | if (ACPI_FAILURE(status)) |
53f8f7c5 WS |
88 | return 1; |
89 | ||
90 | info->addr = sb->slave_address; | |
91 | lookup->speed = sb->connection_speed; | |
92 | if (sb->access_mode == ACPI_I2C_10BIT_MODE) | |
93 | info->flags |= I2C_CLIENT_TEN; | |
94 | ||
95 | return 1; | |
96 | } | |
97 | ||
3a4991a9 HG |
98 | static const struct acpi_device_id i2c_acpi_ignored_device_ids[] = { |
99 | /* | |
100 | * ACPI video acpi_devices, which are handled by the acpi-video driver | |
101 | * sometimes contain a SERIAL_TYPE_I2C ACPI resource, ignore these. | |
102 | */ | |
103 | { ACPI_VIDEO_HID, 0 }, | |
104 | {} | |
105 | }; | |
106 | ||
53f8f7c5 WS |
107 | static int i2c_acpi_do_lookup(struct acpi_device *adev, |
108 | struct i2c_acpi_lookup *lookup) | |
109 | { | |
110 | struct i2c_board_info *info = lookup->info; | |
111 | struct list_head resource_list; | |
112 | int ret; | |
113 | ||
4befedc0 | 114 | if (acpi_bus_get_status(adev) || !adev->status.present) |
53f8f7c5 WS |
115 | return -EINVAL; |
116 | ||
3a4991a9 HG |
117 | if (acpi_match_device_ids(adev, i2c_acpi_ignored_device_ids) == 0) |
118 | return -ENODEV; | |
119 | ||
53f8f7c5 WS |
120 | memset(info, 0, sizeof(*info)); |
121 | lookup->device_handle = acpi_device_handle(adev); | |
122 | ||
123 | /* Look up for I2cSerialBus resource */ | |
124 | INIT_LIST_HEAD(&resource_list); | |
125 | ret = acpi_dev_get_resources(adev, &resource_list, | |
126 | i2c_acpi_fill_info, lookup); | |
127 | acpi_dev_free_resource_list(&resource_list); | |
128 | ||
129 | if (ret < 0 || !info->addr) | |
130 | return -EINVAL; | |
131 | ||
132 | return 0; | |
133 | } | |
134 | ||
c2223ddc CK |
135 | static int i2c_acpi_add_resource(struct acpi_resource *ares, void *data) |
136 | { | |
137 | int *irq = data; | |
138 | struct resource r; | |
139 | ||
140 | if (*irq <= 0 && acpi_dev_resource_interrupt(ares, 0, &r)) | |
141 | *irq = i2c_dev_irq_from_resources(&r, 1); | |
142 | ||
143 | return 1; /* No need to add resource to the list */ | |
144 | } | |
145 | ||
16c9db1d CK |
146 | /** |
147 | * i2c_acpi_get_irq - get device IRQ number from ACPI | |
148 | * @client: Pointer to the I2C client device | |
149 | * | |
150 | * Find the IRQ number used by a specific client device. | |
151 | * | |
152 | * Return: The IRQ number or an error code. | |
153 | */ | |
154 | int i2c_acpi_get_irq(struct i2c_client *client) | |
a52e3b37 | 155 | { |
16c9db1d | 156 | struct acpi_device *adev = ACPI_COMPANION(&client->dev); |
a52e3b37 CK |
157 | struct list_head resource_list; |
158 | int irq = -ENOENT; | |
159 | int ret; | |
160 | ||
161 | INIT_LIST_HEAD(&resource_list); | |
162 | ||
163 | ret = acpi_dev_get_resources(adev, &resource_list, | |
164 | i2c_acpi_add_resource, &irq); | |
165 | if (ret < 0) | |
166 | return ret; | |
167 | ||
168 | acpi_dev_free_resource_list(&resource_list); | |
169 | ||
8466b616 CK |
170 | if (irq == -ENOENT) |
171 | irq = acpi_dev_gpio_irq_get(adev, 0); | |
172 | ||
a52e3b37 CK |
173 | return irq; |
174 | } | |
175 | ||
53f8f7c5 WS |
176 | static int i2c_acpi_get_info(struct acpi_device *adev, |
177 | struct i2c_board_info *info, | |
178 | struct i2c_adapter *adapter, | |
179 | acpi_handle *adapter_handle) | |
180 | { | |
53f8f7c5 WS |
181 | struct i2c_acpi_lookup lookup; |
182 | int ret; | |
183 | ||
184 | memset(&lookup, 0, sizeof(lookup)); | |
185 | lookup.info = info; | |
186 | lookup.index = -1; | |
187 | ||
4befedc0 AB |
188 | if (acpi_device_enumerated(adev)) |
189 | return -EINVAL; | |
190 | ||
53f8f7c5 WS |
191 | ret = i2c_acpi_do_lookup(adev, &lookup); |
192 | if (ret) | |
193 | return ret; | |
194 | ||
195 | if (adapter) { | |
196 | /* The adapter must match the one in I2cSerialBus() connector */ | |
197 | if (ACPI_HANDLE(&adapter->dev) != lookup.adapter_handle) | |
198 | return -ENODEV; | |
199 | } else { | |
200 | struct acpi_device *adapter_adev; | |
201 | ||
202 | /* The adapter must be present */ | |
203 | if (acpi_bus_get_device(lookup.adapter_handle, &adapter_adev)) | |
204 | return -ENODEV; | |
205 | if (acpi_bus_get_status(adapter_adev) || | |
206 | !adapter_adev->status.present) | |
207 | return -ENODEV; | |
208 | } | |
209 | ||
210 | info->fwnode = acpi_fwnode_handle(adev); | |
211 | if (adapter_handle) | |
212 | *adapter_handle = lookup.adapter_handle; | |
213 | ||
53f8f7c5 WS |
214 | acpi_set_modalias(adev, dev_name(&adev->dev), info->type, |
215 | sizeof(info->type)); | |
216 | ||
217 | return 0; | |
218 | } | |
219 | ||
220 | static void i2c_acpi_register_device(struct i2c_adapter *adapter, | |
221 | struct acpi_device *adev, | |
222 | struct i2c_board_info *info) | |
223 | { | |
224 | adev->power.flags.ignore_parent = true; | |
225 | acpi_device_set_enumerated(adev); | |
226 | ||
227 | if (!i2c_new_device(adapter, info)) { | |
228 | adev->power.flags.ignore_parent = false; | |
229 | dev_err(&adapter->dev, | |
230 | "failed to add I2C device %s from ACPI\n", | |
231 | dev_name(&adev->dev)); | |
232 | } | |
233 | } | |
234 | ||
235 | static acpi_status i2c_acpi_add_device(acpi_handle handle, u32 level, | |
236 | void *data, void **return_value) | |
237 | { | |
238 | struct i2c_adapter *adapter = data; | |
239 | struct acpi_device *adev; | |
240 | struct i2c_board_info info; | |
241 | ||
242 | if (acpi_bus_get_device(handle, &adev)) | |
243 | return AE_OK; | |
244 | ||
245 | if (i2c_acpi_get_info(adev, &info, adapter, NULL)) | |
246 | return AE_OK; | |
247 | ||
248 | i2c_acpi_register_device(adapter, adev, &info); | |
249 | ||
250 | return AE_OK; | |
251 | } | |
252 | ||
253 | #define I2C_ACPI_MAX_SCAN_DEPTH 32 | |
254 | ||
255 | /** | |
256 | * i2c_acpi_register_devices - enumerate I2C slave devices behind adapter | |
257 | * @adap: pointer to adapter | |
258 | * | |
259 | * Enumerate all I2C slave devices behind this adapter by walking the ACPI | |
260 | * namespace. When a device is found it will be added to the Linux device | |
261 | * model and bound to the corresponding ACPI handle. | |
262 | */ | |
263 | void i2c_acpi_register_devices(struct i2c_adapter *adap) | |
264 | { | |
265 | acpi_status status; | |
266 | ||
267 | if (!has_acpi_companion(&adap->dev)) | |
268 | return; | |
269 | ||
270 | status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, | |
271 | I2C_ACPI_MAX_SCAN_DEPTH, | |
272 | i2c_acpi_add_device, NULL, | |
273 | adap, NULL); | |
274 | if (ACPI_FAILURE(status)) | |
275 | dev_warn(&adap->dev, "failed to enumerate I2C slaves\n"); | |
276 | } | |
277 | ||
c64ffff7 AS |
278 | const struct acpi_device_id * |
279 | i2c_acpi_match_device(const struct acpi_device_id *matches, | |
280 | struct i2c_client *client) | |
281 | { | |
282 | if (!(client && matches)) | |
283 | return NULL; | |
284 | ||
285 | return acpi_match_device(matches, &client->dev); | |
286 | } | |
287 | ||
53f8f7c5 WS |
288 | static acpi_status i2c_acpi_lookup_speed(acpi_handle handle, u32 level, |
289 | void *data, void **return_value) | |
290 | { | |
291 | struct i2c_acpi_lookup *lookup = data; | |
292 | struct acpi_device *adev; | |
293 | ||
294 | if (acpi_bus_get_device(handle, &adev)) | |
295 | return AE_OK; | |
296 | ||
297 | if (i2c_acpi_do_lookup(adev, lookup)) | |
298 | return AE_OK; | |
299 | ||
300 | if (lookup->search_handle != lookup->adapter_handle) | |
301 | return AE_OK; | |
302 | ||
303 | if (lookup->speed <= lookup->min_speed) | |
304 | lookup->min_speed = lookup->speed; | |
305 | ||
306 | return AE_OK; | |
307 | } | |
308 | ||
309 | /** | |
310 | * i2c_acpi_find_bus_speed - find I2C bus speed from ACPI | |
311 | * @dev: The device owning the bus | |
312 | * | |
313 | * Find the I2C bus speed by walking the ACPI namespace for all I2C slaves | |
314 | * devices connected to this bus and use the speed of slowest device. | |
315 | * | |
316 | * Returns the speed in Hz or zero | |
317 | */ | |
318 | u32 i2c_acpi_find_bus_speed(struct device *dev) | |
319 | { | |
320 | struct i2c_acpi_lookup lookup; | |
321 | struct i2c_board_info dummy; | |
322 | acpi_status status; | |
323 | ||
324 | if (!has_acpi_companion(dev)) | |
325 | return 0; | |
326 | ||
327 | memset(&lookup, 0, sizeof(lookup)); | |
328 | lookup.search_handle = ACPI_HANDLE(dev); | |
329 | lookup.min_speed = UINT_MAX; | |
330 | lookup.info = &dummy; | |
331 | lookup.index = -1; | |
332 | ||
333 | status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, | |
334 | I2C_ACPI_MAX_SCAN_DEPTH, | |
335 | i2c_acpi_lookup_speed, NULL, | |
336 | &lookup, NULL); | |
337 | ||
338 | if (ACPI_FAILURE(status)) { | |
339 | dev_warn(dev, "unable to find I2C bus speed from ACPI\n"); | |
340 | return 0; | |
341 | } | |
342 | ||
343 | return lookup.min_speed != UINT_MAX ? lookup.min_speed : 0; | |
344 | } | |
345 | EXPORT_SYMBOL_GPL(i2c_acpi_find_bus_speed); | |
346 | ||
418e3ea1 | 347 | static int i2c_acpi_find_match_adapter(struct device *dev, const void *data) |
53f8f7c5 WS |
348 | { |
349 | struct i2c_adapter *adapter = i2c_verify_adapter(dev); | |
350 | ||
351 | if (!adapter) | |
352 | return 0; | |
353 | ||
354 | return ACPI_HANDLE(dev) == (acpi_handle)data; | |
355 | } | |
356 | ||
418e3ea1 | 357 | static int i2c_acpi_find_match_device(struct device *dev, const void *data) |
53f8f7c5 WS |
358 | { |
359 | return ACPI_COMPANION(dev) == data; | |
360 | } | |
361 | ||
1e91a2e5 | 362 | struct i2c_adapter *i2c_acpi_find_adapter_by_handle(acpi_handle handle) |
53f8f7c5 WS |
363 | { |
364 | struct device *dev; | |
365 | ||
366 | dev = bus_find_device(&i2c_bus_type, NULL, handle, | |
c64ffff7 | 367 | i2c_acpi_find_match_adapter); |
53f8f7c5 WS |
368 | return dev ? i2c_verify_adapter(dev) : NULL; |
369 | } | |
1e91a2e5 | 370 | EXPORT_SYMBOL_GPL(i2c_acpi_find_adapter_by_handle); |
53f8f7c5 WS |
371 | |
372 | static struct i2c_client *i2c_acpi_find_client_by_adev(struct acpi_device *adev) | |
373 | { | |
374 | struct device *dev; | |
375 | ||
c64ffff7 AS |
376 | dev = bus_find_device(&i2c_bus_type, NULL, adev, |
377 | i2c_acpi_find_match_device); | |
53f8f7c5 WS |
378 | return dev ? i2c_verify_client(dev) : NULL; |
379 | } | |
380 | ||
381 | static int i2c_acpi_notify(struct notifier_block *nb, unsigned long value, | |
382 | void *arg) | |
383 | { | |
384 | struct acpi_device *adev = arg; | |
385 | struct i2c_board_info info; | |
386 | acpi_handle adapter_handle; | |
387 | struct i2c_adapter *adapter; | |
388 | struct i2c_client *client; | |
389 | ||
390 | switch (value) { | |
391 | case ACPI_RECONFIG_DEVICE_ADD: | |
392 | if (i2c_acpi_get_info(adev, &info, NULL, &adapter_handle)) | |
393 | break; | |
394 | ||
395 | adapter = i2c_acpi_find_adapter_by_handle(adapter_handle); | |
396 | if (!adapter) | |
397 | break; | |
398 | ||
399 | i2c_acpi_register_device(adapter, adev, &info); | |
400 | break; | |
401 | case ACPI_RECONFIG_DEVICE_REMOVE: | |
402 | if (!acpi_device_enumerated(adev)) | |
403 | break; | |
404 | ||
405 | client = i2c_acpi_find_client_by_adev(adev); | |
406 | if (!client) | |
407 | break; | |
408 | ||
409 | i2c_unregister_device(client); | |
410 | put_device(&client->dev); | |
411 | break; | |
412 | } | |
413 | ||
414 | return NOTIFY_OK; | |
415 | } | |
416 | ||
417 | struct notifier_block i2c_acpi_notifier = { | |
418 | .notifier_call = i2c_acpi_notify, | |
419 | }; | |
420 | ||
421 | /** | |
422 | * i2c_acpi_new_device - Create i2c-client for the Nth I2cSerialBus resource | |
423 | * @dev: Device owning the ACPI resources to get the client from | |
424 | * @index: Index of ACPI resource to get | |
425 | * @info: describes the I2C device; note this is modified (addr gets set) | |
426 | * Context: can sleep | |
427 | * | |
428 | * By default the i2c subsys creates an i2c-client for the first I2cSerialBus | |
429 | * resource of an acpi_device, but some acpi_devices have multiple I2cSerialBus | |
430 | * resources, in that case this function can be used to create an i2c-client | |
431 | * for other I2cSerialBus resources in the Current Resource Settings table. | |
432 | * | |
433 | * Also see i2c_new_device, which this function calls to create the i2c-client. | |
434 | * | |
2dea645f AS |
435 | * Returns a pointer to the new i2c-client, or error pointer in case of failure. |
436 | * Specifically, -EPROBE_DEFER is returned if the adapter is not found. | |
53f8f7c5 WS |
437 | */ |
438 | struct i2c_client *i2c_acpi_new_device(struct device *dev, int index, | |
439 | struct i2c_board_info *info) | |
440 | { | |
441 | struct i2c_acpi_lookup lookup; | |
442 | struct i2c_adapter *adapter; | |
2dea645f | 443 | struct i2c_client *client; |
53f8f7c5 WS |
444 | struct acpi_device *adev; |
445 | LIST_HEAD(resource_list); | |
446 | int ret; | |
447 | ||
448 | adev = ACPI_COMPANION(dev); | |
449 | if (!adev) | |
2dea645f | 450 | return ERR_PTR(-EINVAL); |
53f8f7c5 WS |
451 | |
452 | memset(&lookup, 0, sizeof(lookup)); | |
453 | lookup.info = info; | |
454 | lookup.device_handle = acpi_device_handle(adev); | |
455 | lookup.index = index; | |
456 | ||
457 | ret = acpi_dev_get_resources(adev, &resource_list, | |
458 | i2c_acpi_fill_info, &lookup); | |
2dea645f AS |
459 | if (ret < 0) |
460 | return ERR_PTR(ret); | |
461 | ||
53f8f7c5 WS |
462 | acpi_dev_free_resource_list(&resource_list); |
463 | ||
2dea645f AS |
464 | if (!info->addr) |
465 | return ERR_PTR(-EADDRNOTAVAIL); | |
53f8f7c5 WS |
466 | |
467 | adapter = i2c_acpi_find_adapter_by_handle(lookup.adapter_handle); | |
468 | if (!adapter) | |
2dea645f AS |
469 | return ERR_PTR(-EPROBE_DEFER); |
470 | ||
471 | client = i2c_new_device(adapter, info); | |
472 | if (!client) | |
473 | return ERR_PTR(-ENODEV); | |
53f8f7c5 | 474 | |
2dea645f | 475 | return client; |
53f8f7c5 WS |
476 | } |
477 | EXPORT_SYMBOL_GPL(i2c_acpi_new_device); | |
478 | ||
479 | #ifdef CONFIG_ACPI_I2C_OPREGION | |
480 | static int acpi_gsb_i2c_read_bytes(struct i2c_client *client, | |
481 | u8 cmd, u8 *data, u8 data_len) | |
482 | { | |
483 | ||
484 | struct i2c_msg msgs[2]; | |
485 | int ret; | |
486 | u8 *buffer; | |
487 | ||
488 | buffer = kzalloc(data_len, GFP_KERNEL); | |
489 | if (!buffer) | |
490 | return AE_NO_MEMORY; | |
491 | ||
492 | msgs[0].addr = client->addr; | |
493 | msgs[0].flags = client->flags; | |
494 | msgs[0].len = 1; | |
495 | msgs[0].buf = &cmd; | |
496 | ||
497 | msgs[1].addr = client->addr; | |
498 | msgs[1].flags = client->flags | I2C_M_RD; | |
499 | msgs[1].len = data_len; | |
500 | msgs[1].buf = buffer; | |
501 | ||
502 | ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs)); | |
7781edae HG |
503 | if (ret < 0) { |
504 | /* Getting a NACK is unfortunately normal with some DSTDs */ | |
505 | if (ret == -EREMOTEIO) | |
506 | dev_dbg(&client->adapter->dev, "i2c read %d bytes from client@%#x starting at reg %#x failed, error: %d\n", | |
507 | data_len, client->addr, cmd, ret); | |
508 | else | |
509 | dev_err(&client->adapter->dev, "i2c read %d bytes from client@%#x starting at reg %#x failed, error: %d\n", | |
510 | data_len, client->addr, cmd, ret); | |
0a30446c HG |
511 | /* 2 transfers must have completed successfully */ |
512 | } else if (ret == 2) { | |
53f8f7c5 | 513 | memcpy(data, buffer, data_len); |
0a30446c HG |
514 | ret = 0; |
515 | } else { | |
516 | ret = -EIO; | |
7781edae | 517 | } |
53f8f7c5 WS |
518 | |
519 | kfree(buffer); | |
520 | return ret; | |
521 | } | |
522 | ||
523 | static int acpi_gsb_i2c_write_bytes(struct i2c_client *client, | |
524 | u8 cmd, u8 *data, u8 data_len) | |
525 | { | |
526 | ||
527 | struct i2c_msg msgs[1]; | |
528 | u8 *buffer; | |
529 | int ret = AE_OK; | |
530 | ||
531 | buffer = kzalloc(data_len + 1, GFP_KERNEL); | |
532 | if (!buffer) | |
533 | return AE_NO_MEMORY; | |
534 | ||
535 | buffer[0] = cmd; | |
536 | memcpy(buffer + 1, data, data_len); | |
537 | ||
538 | msgs[0].addr = client->addr; | |
539 | msgs[0].flags = client->flags; | |
540 | msgs[0].len = data_len + 1; | |
541 | msgs[0].buf = buffer; | |
542 | ||
543 | ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs)); | |
53f8f7c5 WS |
544 | |
545 | kfree(buffer); | |
c463a158 HG |
546 | |
547 | if (ret < 0) { | |
548 | dev_err(&client->adapter->dev, "i2c write failed: %d\n", ret); | |
549 | return ret; | |
550 | } | |
551 | ||
552 | /* 1 transfer must have completed successfully */ | |
553 | return (ret == 1) ? 0 : -EIO; | |
53f8f7c5 WS |
554 | } |
555 | ||
556 | static acpi_status | |
557 | i2c_acpi_space_handler(u32 function, acpi_physical_address command, | |
558 | u32 bits, u64 *value64, | |
559 | void *handler_context, void *region_context) | |
560 | { | |
561 | struct gsb_buffer *gsb = (struct gsb_buffer *)value64; | |
562 | struct i2c_acpi_handler_data *data = handler_context; | |
563 | struct acpi_connection_info *info = &data->info; | |
564 | struct acpi_resource_i2c_serialbus *sb; | |
565 | struct i2c_adapter *adapter = data->adapter; | |
566 | struct i2c_client *client; | |
567 | struct acpi_resource *ares; | |
568 | u32 accessor_type = function >> 16; | |
569 | u8 action = function & ACPI_IO_MASK; | |
570 | acpi_status ret; | |
571 | int status; | |
572 | ||
573 | ret = acpi_buffer_to_resource(info->connection, info->length, &ares); | |
574 | if (ACPI_FAILURE(ret)) | |
575 | return ret; | |
576 | ||
577 | client = kzalloc(sizeof(*client), GFP_KERNEL); | |
578 | if (!client) { | |
579 | ret = AE_NO_MEMORY; | |
580 | goto err; | |
581 | } | |
582 | ||
0d5102fe | 583 | if (!value64 || !i2c_acpi_get_i2c_resource(ares, &sb)) { |
53f8f7c5 WS |
584 | ret = AE_BAD_PARAMETER; |
585 | goto err; | |
586 | } | |
587 | ||
588 | client->adapter = adapter; | |
589 | client->addr = sb->slave_address; | |
590 | ||
591 | if (sb->access_mode == ACPI_I2C_10BIT_MODE) | |
592 | client->flags |= I2C_CLIENT_TEN; | |
593 | ||
594 | switch (accessor_type) { | |
595 | case ACPI_GSB_ACCESS_ATTRIB_SEND_RCV: | |
596 | if (action == ACPI_READ) { | |
597 | status = i2c_smbus_read_byte(client); | |
598 | if (status >= 0) { | |
599 | gsb->bdata = status; | |
600 | status = 0; | |
601 | } | |
602 | } else { | |
603 | status = i2c_smbus_write_byte(client, gsb->bdata); | |
604 | } | |
605 | break; | |
606 | ||
607 | case ACPI_GSB_ACCESS_ATTRIB_BYTE: | |
608 | if (action == ACPI_READ) { | |
609 | status = i2c_smbus_read_byte_data(client, command); | |
610 | if (status >= 0) { | |
611 | gsb->bdata = status; | |
612 | status = 0; | |
613 | } | |
614 | } else { | |
615 | status = i2c_smbus_write_byte_data(client, command, | |
616 | gsb->bdata); | |
617 | } | |
618 | break; | |
619 | ||
620 | case ACPI_GSB_ACCESS_ATTRIB_WORD: | |
621 | if (action == ACPI_READ) { | |
622 | status = i2c_smbus_read_word_data(client, command); | |
623 | if (status >= 0) { | |
624 | gsb->wdata = status; | |
625 | status = 0; | |
626 | } | |
627 | } else { | |
628 | status = i2c_smbus_write_word_data(client, command, | |
629 | gsb->wdata); | |
630 | } | |
631 | break; | |
632 | ||
633 | case ACPI_GSB_ACCESS_ATTRIB_BLOCK: | |
634 | if (action == ACPI_READ) { | |
635 | status = i2c_smbus_read_block_data(client, command, | |
636 | gsb->data); | |
637 | if (status >= 0) { | |
638 | gsb->len = status; | |
639 | status = 0; | |
640 | } | |
641 | } else { | |
642 | status = i2c_smbus_write_block_data(client, command, | |
643 | gsb->len, gsb->data); | |
644 | } | |
645 | break; | |
646 | ||
647 | case ACPI_GSB_ACCESS_ATTRIB_MULTIBYTE: | |
648 | if (action == ACPI_READ) { | |
649 | status = acpi_gsb_i2c_read_bytes(client, command, | |
650 | gsb->data, info->access_length); | |
53f8f7c5 WS |
651 | } else { |
652 | status = acpi_gsb_i2c_write_bytes(client, command, | |
653 | gsb->data, info->access_length); | |
654 | } | |
655 | break; | |
656 | ||
657 | default: | |
658 | dev_warn(&adapter->dev, "protocol 0x%02x not supported for client 0x%02x\n", | |
659 | accessor_type, client->addr); | |
660 | ret = AE_BAD_PARAMETER; | |
661 | goto err; | |
662 | } | |
663 | ||
664 | gsb->status = status; | |
665 | ||
666 | err: | |
667 | kfree(client); | |
668 | ACPI_FREE(ares); | |
669 | return ret; | |
670 | } | |
671 | ||
672 | ||
673 | int i2c_acpi_install_space_handler(struct i2c_adapter *adapter) | |
674 | { | |
675 | acpi_handle handle; | |
676 | struct i2c_acpi_handler_data *data; | |
677 | acpi_status status; | |
678 | ||
679 | if (!adapter->dev.parent) | |
680 | return -ENODEV; | |
681 | ||
682 | handle = ACPI_HANDLE(adapter->dev.parent); | |
683 | ||
684 | if (!handle) | |
685 | return -ENODEV; | |
686 | ||
687 | data = kzalloc(sizeof(struct i2c_acpi_handler_data), | |
688 | GFP_KERNEL); | |
689 | if (!data) | |
690 | return -ENOMEM; | |
691 | ||
692 | data->adapter = adapter; | |
693 | status = acpi_bus_attach_private_data(handle, (void *)data); | |
694 | if (ACPI_FAILURE(status)) { | |
695 | kfree(data); | |
696 | return -ENOMEM; | |
697 | } | |
698 | ||
699 | status = acpi_install_address_space_handler(handle, | |
700 | ACPI_ADR_SPACE_GSBUS, | |
701 | &i2c_acpi_space_handler, | |
702 | NULL, | |
703 | data); | |
704 | if (ACPI_FAILURE(status)) { | |
705 | dev_err(&adapter->dev, "Error installing i2c space handler\n"); | |
706 | acpi_bus_detach_private_data(handle); | |
707 | kfree(data); | |
708 | return -ENOMEM; | |
709 | } | |
710 | ||
711 | acpi_walk_dep_device_list(handle); | |
712 | return 0; | |
713 | } | |
714 | ||
715 | void i2c_acpi_remove_space_handler(struct i2c_adapter *adapter) | |
716 | { | |
717 | acpi_handle handle; | |
718 | struct i2c_acpi_handler_data *data; | |
719 | acpi_status status; | |
720 | ||
721 | if (!adapter->dev.parent) | |
722 | return; | |
723 | ||
724 | handle = ACPI_HANDLE(adapter->dev.parent); | |
725 | ||
726 | if (!handle) | |
727 | return; | |
728 | ||
729 | acpi_remove_address_space_handler(handle, | |
730 | ACPI_ADR_SPACE_GSBUS, | |
731 | &i2c_acpi_space_handler); | |
732 | ||
733 | status = acpi_bus_get_private_data(handle, (void **)&data); | |
734 | if (ACPI_SUCCESS(status)) | |
735 | kfree(data); | |
736 | ||
737 | acpi_bus_detach_private_data(handle); | |
738 | } | |
739 | #endif /* CONFIG_ACPI_I2C_OPREGION */ |