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; | |
7574c0db | 42 | u32 force_speed; |
53f8f7c5 WS |
43 | }; |
44 | ||
0d5102fe AS |
45 | /** |
46 | * i2c_acpi_get_i2c_resource - Gets I2cSerialBus resource if type matches | |
47 | * @ares: ACPI resource | |
48 | * @i2c: Pointer to I2cSerialBus resource will be returned here | |
49 | * | |
50 | * Checks if the given ACPI resource is of type I2cSerialBus. | |
51 | * In this case, returns a pointer to it to the caller. | |
52 | * | |
53 | * Returns true if resource type is of I2cSerialBus, otherwise false. | |
54 | */ | |
55 | bool i2c_acpi_get_i2c_resource(struct acpi_resource *ares, | |
56 | struct acpi_resource_i2c_serialbus **i2c) | |
57 | { | |
58 | struct acpi_resource_i2c_serialbus *sb; | |
59 | ||
60 | if (ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS) | |
61 | return false; | |
62 | ||
63 | sb = &ares->data.i2c_serial_bus; | |
64 | if (sb->type != ACPI_RESOURCE_SERIAL_TYPE_I2C) | |
65 | return false; | |
66 | ||
67 | *i2c = sb; | |
68 | return true; | |
69 | } | |
70 | EXPORT_SYMBOL_GPL(i2c_acpi_get_i2c_resource); | |
71 | ||
53f8f7c5 WS |
72 | static int i2c_acpi_fill_info(struct acpi_resource *ares, void *data) |
73 | { | |
74 | struct i2c_acpi_lookup *lookup = data; | |
75 | struct i2c_board_info *info = lookup->info; | |
76 | struct acpi_resource_i2c_serialbus *sb; | |
77 | acpi_status status; | |
78 | ||
0d5102fe | 79 | if (info->addr || !i2c_acpi_get_i2c_resource(ares, &sb)) |
53f8f7c5 WS |
80 | return 1; |
81 | ||
82 | if (lookup->index != -1 && lookup->n++ != lookup->index) | |
83 | return 1; | |
84 | ||
85 | status = acpi_get_handle(lookup->device_handle, | |
86 | sb->resource_source.string_ptr, | |
87 | &lookup->adapter_handle); | |
5f59d6a1 | 88 | if (ACPI_FAILURE(status)) |
53f8f7c5 WS |
89 | return 1; |
90 | ||
91 | info->addr = sb->slave_address; | |
92 | lookup->speed = sb->connection_speed; | |
93 | if (sb->access_mode == ACPI_I2C_10BIT_MODE) | |
94 | info->flags |= I2C_CLIENT_TEN; | |
95 | ||
96 | return 1; | |
97 | } | |
98 | ||
3a4991a9 HG |
99 | static const struct acpi_device_id i2c_acpi_ignored_device_ids[] = { |
100 | /* | |
101 | * ACPI video acpi_devices, which are handled by the acpi-video driver | |
102 | * sometimes contain a SERIAL_TYPE_I2C ACPI resource, ignore these. | |
103 | */ | |
104 | { ACPI_VIDEO_HID, 0 }, | |
105 | {} | |
106 | }; | |
107 | ||
53f8f7c5 WS |
108 | static int i2c_acpi_do_lookup(struct acpi_device *adev, |
109 | struct i2c_acpi_lookup *lookup) | |
110 | { | |
111 | struct i2c_board_info *info = lookup->info; | |
112 | struct list_head resource_list; | |
113 | int ret; | |
114 | ||
4befedc0 | 115 | if (acpi_bus_get_status(adev) || !adev->status.present) |
53f8f7c5 WS |
116 | return -EINVAL; |
117 | ||
3a4991a9 HG |
118 | if (acpi_match_device_ids(adev, i2c_acpi_ignored_device_ids) == 0) |
119 | return -ENODEV; | |
120 | ||
53f8f7c5 WS |
121 | memset(info, 0, sizeof(*info)); |
122 | lookup->device_handle = acpi_device_handle(adev); | |
123 | ||
124 | /* Look up for I2cSerialBus resource */ | |
125 | INIT_LIST_HEAD(&resource_list); | |
126 | ret = acpi_dev_get_resources(adev, &resource_list, | |
127 | i2c_acpi_fill_info, lookup); | |
128 | acpi_dev_free_resource_list(&resource_list); | |
129 | ||
130 | if (ret < 0 || !info->addr) | |
131 | return -EINVAL; | |
132 | ||
133 | return 0; | |
134 | } | |
135 | ||
c2223ddc CK |
136 | static int i2c_acpi_add_resource(struct acpi_resource *ares, void *data) |
137 | { | |
138 | int *irq = data; | |
139 | struct resource r; | |
140 | ||
141 | if (*irq <= 0 && acpi_dev_resource_interrupt(ares, 0, &r)) | |
142 | *irq = i2c_dev_irq_from_resources(&r, 1); | |
143 | ||
144 | return 1; /* No need to add resource to the list */ | |
145 | } | |
146 | ||
16c9db1d CK |
147 | /** |
148 | * i2c_acpi_get_irq - get device IRQ number from ACPI | |
149 | * @client: Pointer to the I2C client device | |
150 | * | |
151 | * Find the IRQ number used by a specific client device. | |
152 | * | |
153 | * Return: The IRQ number or an error code. | |
154 | */ | |
155 | int i2c_acpi_get_irq(struct i2c_client *client) | |
a52e3b37 | 156 | { |
16c9db1d | 157 | struct acpi_device *adev = ACPI_COMPANION(&client->dev); |
a52e3b37 CK |
158 | struct list_head resource_list; |
159 | int irq = -ENOENT; | |
160 | int ret; | |
161 | ||
162 | INIT_LIST_HEAD(&resource_list); | |
163 | ||
164 | ret = acpi_dev_get_resources(adev, &resource_list, | |
165 | i2c_acpi_add_resource, &irq); | |
166 | if (ret < 0) | |
167 | return ret; | |
168 | ||
169 | acpi_dev_free_resource_list(&resource_list); | |
170 | ||
8466b616 CK |
171 | if (irq == -ENOENT) |
172 | irq = acpi_dev_gpio_irq_get(adev, 0); | |
173 | ||
a52e3b37 CK |
174 | return irq; |
175 | } | |
176 | ||
53f8f7c5 WS |
177 | static int i2c_acpi_get_info(struct acpi_device *adev, |
178 | struct i2c_board_info *info, | |
179 | struct i2c_adapter *adapter, | |
180 | acpi_handle *adapter_handle) | |
181 | { | |
53f8f7c5 WS |
182 | struct i2c_acpi_lookup lookup; |
183 | int ret; | |
184 | ||
185 | memset(&lookup, 0, sizeof(lookup)); | |
186 | lookup.info = info; | |
187 | lookup.index = -1; | |
188 | ||
4befedc0 AB |
189 | if (acpi_device_enumerated(adev)) |
190 | return -EINVAL; | |
191 | ||
53f8f7c5 WS |
192 | ret = i2c_acpi_do_lookup(adev, &lookup); |
193 | if (ret) | |
194 | return ret; | |
195 | ||
196 | if (adapter) { | |
197 | /* The adapter must match the one in I2cSerialBus() connector */ | |
198 | if (ACPI_HANDLE(&adapter->dev) != lookup.adapter_handle) | |
199 | return -ENODEV; | |
200 | } else { | |
201 | struct acpi_device *adapter_adev; | |
202 | ||
203 | /* The adapter must be present */ | |
204 | if (acpi_bus_get_device(lookup.adapter_handle, &adapter_adev)) | |
205 | return -ENODEV; | |
206 | if (acpi_bus_get_status(adapter_adev) || | |
207 | !adapter_adev->status.present) | |
208 | return -ENODEV; | |
209 | } | |
210 | ||
211 | info->fwnode = acpi_fwnode_handle(adev); | |
212 | if (adapter_handle) | |
213 | *adapter_handle = lookup.adapter_handle; | |
214 | ||
53f8f7c5 WS |
215 | acpi_set_modalias(adev, dev_name(&adev->dev), info->type, |
216 | sizeof(info->type)); | |
217 | ||
218 | return 0; | |
219 | } | |
220 | ||
221 | static void i2c_acpi_register_device(struct i2c_adapter *adapter, | |
222 | struct acpi_device *adev, | |
223 | struct i2c_board_info *info) | |
224 | { | |
225 | adev->power.flags.ignore_parent = true; | |
226 | acpi_device_set_enumerated(adev); | |
227 | ||
90a3be9b | 228 | if (IS_ERR(i2c_new_client_device(adapter, info))) { |
53f8f7c5 WS |
229 | adev->power.flags.ignore_parent = false; |
230 | dev_err(&adapter->dev, | |
231 | "failed to add I2C device %s from ACPI\n", | |
232 | dev_name(&adev->dev)); | |
233 | } | |
234 | } | |
235 | ||
236 | static acpi_status i2c_acpi_add_device(acpi_handle handle, u32 level, | |
237 | void *data, void **return_value) | |
238 | { | |
239 | struct i2c_adapter *adapter = data; | |
240 | struct acpi_device *adev; | |
241 | struct i2c_board_info info; | |
242 | ||
243 | if (acpi_bus_get_device(handle, &adev)) | |
244 | return AE_OK; | |
245 | ||
246 | if (i2c_acpi_get_info(adev, &info, adapter, NULL)) | |
247 | return AE_OK; | |
248 | ||
249 | i2c_acpi_register_device(adapter, adev, &info); | |
250 | ||
251 | return AE_OK; | |
252 | } | |
253 | ||
254 | #define I2C_ACPI_MAX_SCAN_DEPTH 32 | |
255 | ||
256 | /** | |
257 | * i2c_acpi_register_devices - enumerate I2C slave devices behind adapter | |
258 | * @adap: pointer to adapter | |
259 | * | |
260 | * Enumerate all I2C slave devices behind this adapter by walking the ACPI | |
261 | * namespace. When a device is found it will be added to the Linux device | |
262 | * model and bound to the corresponding ACPI handle. | |
263 | */ | |
264 | void i2c_acpi_register_devices(struct i2c_adapter *adap) | |
265 | { | |
266 | acpi_status status; | |
267 | ||
268 | if (!has_acpi_companion(&adap->dev)) | |
269 | return; | |
270 | ||
271 | status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, | |
272 | I2C_ACPI_MAX_SCAN_DEPTH, | |
273 | i2c_acpi_add_device, NULL, | |
274 | adap, NULL); | |
275 | if (ACPI_FAILURE(status)) | |
276 | dev_warn(&adap->dev, "failed to enumerate I2C slaves\n"); | |
277 | } | |
278 | ||
c64ffff7 AS |
279 | const struct acpi_device_id * |
280 | i2c_acpi_match_device(const struct acpi_device_id *matches, | |
281 | struct i2c_client *client) | |
282 | { | |
283 | if (!(client && matches)) | |
284 | return NULL; | |
285 | ||
286 | return acpi_match_device(matches, &client->dev); | |
287 | } | |
288 | ||
7574c0db HG |
289 | static const struct acpi_device_id i2c_acpi_force_400khz_device_ids[] = { |
290 | /* | |
291 | * These Silead touchscreen controllers only work at 400KHz, for | |
292 | * some reason they do not work at 100KHz. On some devices the ACPI | |
293 | * tables list another device at their bus as only being capable | |
294 | * of 100KHz, testing has shown that these other devices work fine | |
295 | * at 400KHz (as can be expected of any recent i2c hw) so we force | |
296 | * the speed of the bus to 400 KHz if a Silead device is present. | |
297 | */ | |
298 | { "MSSL1680", 0 }, | |
299 | {} | |
300 | }; | |
301 | ||
53f8f7c5 WS |
302 | static acpi_status i2c_acpi_lookup_speed(acpi_handle handle, u32 level, |
303 | void *data, void **return_value) | |
304 | { | |
305 | struct i2c_acpi_lookup *lookup = data; | |
306 | struct acpi_device *adev; | |
307 | ||
308 | if (acpi_bus_get_device(handle, &adev)) | |
309 | return AE_OK; | |
310 | ||
311 | if (i2c_acpi_do_lookup(adev, lookup)) | |
312 | return AE_OK; | |
313 | ||
314 | if (lookup->search_handle != lookup->adapter_handle) | |
315 | return AE_OK; | |
316 | ||
317 | if (lookup->speed <= lookup->min_speed) | |
318 | lookup->min_speed = lookup->speed; | |
319 | ||
7574c0db HG |
320 | if (acpi_match_device_ids(adev, i2c_acpi_force_400khz_device_ids) == 0) |
321 | lookup->force_speed = 400000; | |
322 | ||
53f8f7c5 WS |
323 | return AE_OK; |
324 | } | |
325 | ||
326 | /** | |
327 | * i2c_acpi_find_bus_speed - find I2C bus speed from ACPI | |
328 | * @dev: The device owning the bus | |
329 | * | |
330 | * Find the I2C bus speed by walking the ACPI namespace for all I2C slaves | |
331 | * devices connected to this bus and use the speed of slowest device. | |
332 | * | |
333 | * Returns the speed in Hz or zero | |
334 | */ | |
335 | u32 i2c_acpi_find_bus_speed(struct device *dev) | |
336 | { | |
337 | struct i2c_acpi_lookup lookup; | |
338 | struct i2c_board_info dummy; | |
339 | acpi_status status; | |
340 | ||
341 | if (!has_acpi_companion(dev)) | |
342 | return 0; | |
343 | ||
344 | memset(&lookup, 0, sizeof(lookup)); | |
345 | lookup.search_handle = ACPI_HANDLE(dev); | |
346 | lookup.min_speed = UINT_MAX; | |
347 | lookup.info = &dummy; | |
348 | lookup.index = -1; | |
349 | ||
350 | status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, | |
351 | I2C_ACPI_MAX_SCAN_DEPTH, | |
352 | i2c_acpi_lookup_speed, NULL, | |
353 | &lookup, NULL); | |
354 | ||
355 | if (ACPI_FAILURE(status)) { | |
356 | dev_warn(dev, "unable to find I2C bus speed from ACPI\n"); | |
357 | return 0; | |
358 | } | |
359 | ||
7574c0db HG |
360 | if (lookup.force_speed) { |
361 | if (lookup.force_speed != lookup.min_speed) | |
362 | dev_warn(dev, FW_BUG "DSDT uses known not-working I2C bus speed %d, forcing it to %d\n", | |
363 | lookup.min_speed, lookup.force_speed); | |
364 | return lookup.force_speed; | |
365 | } else if (lookup.min_speed != UINT_MAX) { | |
366 | return lookup.min_speed; | |
367 | } else { | |
368 | return 0; | |
369 | } | |
53f8f7c5 WS |
370 | } |
371 | EXPORT_SYMBOL_GPL(i2c_acpi_find_bus_speed); | |
372 | ||
418e3ea1 | 373 | static int i2c_acpi_find_match_adapter(struct device *dev, const void *data) |
53f8f7c5 WS |
374 | { |
375 | struct i2c_adapter *adapter = i2c_verify_adapter(dev); | |
376 | ||
377 | if (!adapter) | |
378 | return 0; | |
379 | ||
380 | return ACPI_HANDLE(dev) == (acpi_handle)data; | |
381 | } | |
382 | ||
1e91a2e5 | 383 | struct i2c_adapter *i2c_acpi_find_adapter_by_handle(acpi_handle handle) |
53f8f7c5 | 384 | { |
644bf600 SP |
385 | struct device *dev; |
386 | ||
387 | dev = bus_find_device(&i2c_bus_type, NULL, handle, | |
388 | i2c_acpi_find_match_adapter); | |
53f8f7c5 | 389 | |
53f8f7c5 WS |
390 | return dev ? i2c_verify_adapter(dev) : NULL; |
391 | } | |
1e91a2e5 | 392 | EXPORT_SYMBOL_GPL(i2c_acpi_find_adapter_by_handle); |
53f8f7c5 WS |
393 | |
394 | static struct i2c_client *i2c_acpi_find_client_by_adev(struct acpi_device *adev) | |
395 | { | |
396 | struct device *dev; | |
397 | ||
00500147 | 398 | dev = bus_find_device_by_acpi_dev(&i2c_bus_type, adev); |
53f8f7c5 WS |
399 | return dev ? i2c_verify_client(dev) : NULL; |
400 | } | |
401 | ||
402 | static int i2c_acpi_notify(struct notifier_block *nb, unsigned long value, | |
403 | void *arg) | |
404 | { | |
405 | struct acpi_device *adev = arg; | |
406 | struct i2c_board_info info; | |
407 | acpi_handle adapter_handle; | |
408 | struct i2c_adapter *adapter; | |
409 | struct i2c_client *client; | |
410 | ||
411 | switch (value) { | |
412 | case ACPI_RECONFIG_DEVICE_ADD: | |
413 | if (i2c_acpi_get_info(adev, &info, NULL, &adapter_handle)) | |
414 | break; | |
415 | ||
416 | adapter = i2c_acpi_find_adapter_by_handle(adapter_handle); | |
417 | if (!adapter) | |
418 | break; | |
419 | ||
420 | i2c_acpi_register_device(adapter, adev, &info); | |
421 | break; | |
422 | case ACPI_RECONFIG_DEVICE_REMOVE: | |
423 | if (!acpi_device_enumerated(adev)) | |
424 | break; | |
425 | ||
426 | client = i2c_acpi_find_client_by_adev(adev); | |
427 | if (!client) | |
428 | break; | |
429 | ||
430 | i2c_unregister_device(client); | |
431 | put_device(&client->dev); | |
432 | break; | |
433 | } | |
434 | ||
435 | return NOTIFY_OK; | |
436 | } | |
437 | ||
438 | struct notifier_block i2c_acpi_notifier = { | |
439 | .notifier_call = i2c_acpi_notify, | |
440 | }; | |
441 | ||
442 | /** | |
443 | * i2c_acpi_new_device - Create i2c-client for the Nth I2cSerialBus resource | |
444 | * @dev: Device owning the ACPI resources to get the client from | |
445 | * @index: Index of ACPI resource to get | |
446 | * @info: describes the I2C device; note this is modified (addr gets set) | |
447 | * Context: can sleep | |
448 | * | |
449 | * By default the i2c subsys creates an i2c-client for the first I2cSerialBus | |
450 | * resource of an acpi_device, but some acpi_devices have multiple I2cSerialBus | |
451 | * resources, in that case this function can be used to create an i2c-client | |
452 | * for other I2cSerialBus resources in the Current Resource Settings table. | |
453 | * | |
90a3be9b WS |
454 | * Also see i2c_new_client_device, which this function calls to create the |
455 | * i2c-client. | |
53f8f7c5 | 456 | * |
2dea645f AS |
457 | * Returns a pointer to the new i2c-client, or error pointer in case of failure. |
458 | * Specifically, -EPROBE_DEFER is returned if the adapter is not found. | |
53f8f7c5 WS |
459 | */ |
460 | struct i2c_client *i2c_acpi_new_device(struct device *dev, int index, | |
461 | struct i2c_board_info *info) | |
462 | { | |
463 | struct i2c_acpi_lookup lookup; | |
464 | struct i2c_adapter *adapter; | |
465 | struct acpi_device *adev; | |
466 | LIST_HEAD(resource_list); | |
467 | int ret; | |
468 | ||
469 | adev = ACPI_COMPANION(dev); | |
470 | if (!adev) | |
2dea645f | 471 | return ERR_PTR(-EINVAL); |
53f8f7c5 WS |
472 | |
473 | memset(&lookup, 0, sizeof(lookup)); | |
474 | lookup.info = info; | |
475 | lookup.device_handle = acpi_device_handle(adev); | |
476 | lookup.index = index; | |
477 | ||
478 | ret = acpi_dev_get_resources(adev, &resource_list, | |
479 | i2c_acpi_fill_info, &lookup); | |
2dea645f AS |
480 | if (ret < 0) |
481 | return ERR_PTR(ret); | |
482 | ||
53f8f7c5 WS |
483 | acpi_dev_free_resource_list(&resource_list); |
484 | ||
2dea645f AS |
485 | if (!info->addr) |
486 | return ERR_PTR(-EADDRNOTAVAIL); | |
53f8f7c5 WS |
487 | |
488 | adapter = i2c_acpi_find_adapter_by_handle(lookup.adapter_handle); | |
489 | if (!adapter) | |
2dea645f AS |
490 | return ERR_PTR(-EPROBE_DEFER); |
491 | ||
90a3be9b | 492 | return i2c_new_client_device(adapter, info); |
53f8f7c5 WS |
493 | } |
494 | EXPORT_SYMBOL_GPL(i2c_acpi_new_device); | |
495 | ||
496 | #ifdef CONFIG_ACPI_I2C_OPREGION | |
497 | static int acpi_gsb_i2c_read_bytes(struct i2c_client *client, | |
498 | u8 cmd, u8 *data, u8 data_len) | |
499 | { | |
500 | ||
501 | struct i2c_msg msgs[2]; | |
502 | int ret; | |
503 | u8 *buffer; | |
504 | ||
505 | buffer = kzalloc(data_len, GFP_KERNEL); | |
506 | if (!buffer) | |
507 | return AE_NO_MEMORY; | |
508 | ||
509 | msgs[0].addr = client->addr; | |
510 | msgs[0].flags = client->flags; | |
511 | msgs[0].len = 1; | |
512 | msgs[0].buf = &cmd; | |
513 | ||
514 | msgs[1].addr = client->addr; | |
515 | msgs[1].flags = client->flags | I2C_M_RD; | |
516 | msgs[1].len = data_len; | |
517 | msgs[1].buf = buffer; | |
518 | ||
519 | ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs)); | |
7781edae HG |
520 | if (ret < 0) { |
521 | /* Getting a NACK is unfortunately normal with some DSTDs */ | |
522 | if (ret == -EREMOTEIO) | |
523 | dev_dbg(&client->adapter->dev, "i2c read %d bytes from client@%#x starting at reg %#x failed, error: %d\n", | |
524 | data_len, client->addr, cmd, ret); | |
525 | else | |
526 | dev_err(&client->adapter->dev, "i2c read %d bytes from client@%#x starting at reg %#x failed, error: %d\n", | |
527 | data_len, client->addr, cmd, ret); | |
0a30446c HG |
528 | /* 2 transfers must have completed successfully */ |
529 | } else if (ret == 2) { | |
53f8f7c5 | 530 | memcpy(data, buffer, data_len); |
0a30446c HG |
531 | ret = 0; |
532 | } else { | |
533 | ret = -EIO; | |
7781edae | 534 | } |
53f8f7c5 WS |
535 | |
536 | kfree(buffer); | |
537 | return ret; | |
538 | } | |
539 | ||
540 | static int acpi_gsb_i2c_write_bytes(struct i2c_client *client, | |
541 | u8 cmd, u8 *data, u8 data_len) | |
542 | { | |
543 | ||
544 | struct i2c_msg msgs[1]; | |
545 | u8 *buffer; | |
546 | int ret = AE_OK; | |
547 | ||
548 | buffer = kzalloc(data_len + 1, GFP_KERNEL); | |
549 | if (!buffer) | |
550 | return AE_NO_MEMORY; | |
551 | ||
552 | buffer[0] = cmd; | |
553 | memcpy(buffer + 1, data, data_len); | |
554 | ||
555 | msgs[0].addr = client->addr; | |
556 | msgs[0].flags = client->flags; | |
557 | msgs[0].len = data_len + 1; | |
558 | msgs[0].buf = buffer; | |
559 | ||
560 | ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs)); | |
53f8f7c5 WS |
561 | |
562 | kfree(buffer); | |
c463a158 HG |
563 | |
564 | if (ret < 0) { | |
565 | dev_err(&client->adapter->dev, "i2c write failed: %d\n", ret); | |
566 | return ret; | |
567 | } | |
568 | ||
569 | /* 1 transfer must have completed successfully */ | |
570 | return (ret == 1) ? 0 : -EIO; | |
53f8f7c5 WS |
571 | } |
572 | ||
573 | static acpi_status | |
574 | i2c_acpi_space_handler(u32 function, acpi_physical_address command, | |
575 | u32 bits, u64 *value64, | |
576 | void *handler_context, void *region_context) | |
577 | { | |
578 | struct gsb_buffer *gsb = (struct gsb_buffer *)value64; | |
579 | struct i2c_acpi_handler_data *data = handler_context; | |
580 | struct acpi_connection_info *info = &data->info; | |
581 | struct acpi_resource_i2c_serialbus *sb; | |
582 | struct i2c_adapter *adapter = data->adapter; | |
583 | struct i2c_client *client; | |
584 | struct acpi_resource *ares; | |
585 | u32 accessor_type = function >> 16; | |
586 | u8 action = function & ACPI_IO_MASK; | |
587 | acpi_status ret; | |
588 | int status; | |
589 | ||
590 | ret = acpi_buffer_to_resource(info->connection, info->length, &ares); | |
591 | if (ACPI_FAILURE(ret)) | |
592 | return ret; | |
593 | ||
594 | client = kzalloc(sizeof(*client), GFP_KERNEL); | |
595 | if (!client) { | |
596 | ret = AE_NO_MEMORY; | |
597 | goto err; | |
598 | } | |
599 | ||
0d5102fe | 600 | if (!value64 || !i2c_acpi_get_i2c_resource(ares, &sb)) { |
53f8f7c5 WS |
601 | ret = AE_BAD_PARAMETER; |
602 | goto err; | |
603 | } | |
604 | ||
605 | client->adapter = adapter; | |
606 | client->addr = sb->slave_address; | |
607 | ||
608 | if (sb->access_mode == ACPI_I2C_10BIT_MODE) | |
609 | client->flags |= I2C_CLIENT_TEN; | |
610 | ||
611 | switch (accessor_type) { | |
612 | case ACPI_GSB_ACCESS_ATTRIB_SEND_RCV: | |
613 | if (action == ACPI_READ) { | |
614 | status = i2c_smbus_read_byte(client); | |
615 | if (status >= 0) { | |
616 | gsb->bdata = status; | |
617 | status = 0; | |
618 | } | |
619 | } else { | |
620 | status = i2c_smbus_write_byte(client, gsb->bdata); | |
621 | } | |
622 | break; | |
623 | ||
624 | case ACPI_GSB_ACCESS_ATTRIB_BYTE: | |
625 | if (action == ACPI_READ) { | |
626 | status = i2c_smbus_read_byte_data(client, command); | |
627 | if (status >= 0) { | |
628 | gsb->bdata = status; | |
629 | status = 0; | |
630 | } | |
631 | } else { | |
632 | status = i2c_smbus_write_byte_data(client, command, | |
633 | gsb->bdata); | |
634 | } | |
635 | break; | |
636 | ||
637 | case ACPI_GSB_ACCESS_ATTRIB_WORD: | |
638 | if (action == ACPI_READ) { | |
639 | status = i2c_smbus_read_word_data(client, command); | |
640 | if (status >= 0) { | |
641 | gsb->wdata = status; | |
642 | status = 0; | |
643 | } | |
644 | } else { | |
645 | status = i2c_smbus_write_word_data(client, command, | |
646 | gsb->wdata); | |
647 | } | |
648 | break; | |
649 | ||
650 | case ACPI_GSB_ACCESS_ATTRIB_BLOCK: | |
651 | if (action == ACPI_READ) { | |
652 | status = i2c_smbus_read_block_data(client, command, | |
653 | gsb->data); | |
654 | if (status >= 0) { | |
655 | gsb->len = status; | |
656 | status = 0; | |
657 | } | |
658 | } else { | |
659 | status = i2c_smbus_write_block_data(client, command, | |
660 | gsb->len, gsb->data); | |
661 | } | |
662 | break; | |
663 | ||
664 | case ACPI_GSB_ACCESS_ATTRIB_MULTIBYTE: | |
665 | if (action == ACPI_READ) { | |
666 | status = acpi_gsb_i2c_read_bytes(client, command, | |
667 | gsb->data, info->access_length); | |
53f8f7c5 WS |
668 | } else { |
669 | status = acpi_gsb_i2c_write_bytes(client, command, | |
670 | gsb->data, info->access_length); | |
671 | } | |
672 | break; | |
673 | ||
674 | default: | |
675 | dev_warn(&adapter->dev, "protocol 0x%02x not supported for client 0x%02x\n", | |
676 | accessor_type, client->addr); | |
677 | ret = AE_BAD_PARAMETER; | |
678 | goto err; | |
679 | } | |
680 | ||
681 | gsb->status = status; | |
682 | ||
683 | err: | |
684 | kfree(client); | |
685 | ACPI_FREE(ares); | |
686 | return ret; | |
687 | } | |
688 | ||
689 | ||
690 | int i2c_acpi_install_space_handler(struct i2c_adapter *adapter) | |
691 | { | |
692 | acpi_handle handle; | |
693 | struct i2c_acpi_handler_data *data; | |
694 | acpi_status status; | |
695 | ||
696 | if (!adapter->dev.parent) | |
697 | return -ENODEV; | |
698 | ||
699 | handle = ACPI_HANDLE(adapter->dev.parent); | |
700 | ||
701 | if (!handle) | |
702 | return -ENODEV; | |
703 | ||
704 | data = kzalloc(sizeof(struct i2c_acpi_handler_data), | |
705 | GFP_KERNEL); | |
706 | if (!data) | |
707 | return -ENOMEM; | |
708 | ||
709 | data->adapter = adapter; | |
710 | status = acpi_bus_attach_private_data(handle, (void *)data); | |
711 | if (ACPI_FAILURE(status)) { | |
712 | kfree(data); | |
713 | return -ENOMEM; | |
714 | } | |
715 | ||
716 | status = acpi_install_address_space_handler(handle, | |
717 | ACPI_ADR_SPACE_GSBUS, | |
718 | &i2c_acpi_space_handler, | |
719 | NULL, | |
720 | data); | |
721 | if (ACPI_FAILURE(status)) { | |
722 | dev_err(&adapter->dev, "Error installing i2c space handler\n"); | |
723 | acpi_bus_detach_private_data(handle); | |
724 | kfree(data); | |
725 | return -ENOMEM; | |
726 | } | |
727 | ||
728 | acpi_walk_dep_device_list(handle); | |
729 | return 0; | |
730 | } | |
731 | ||
732 | void i2c_acpi_remove_space_handler(struct i2c_adapter *adapter) | |
733 | { | |
734 | acpi_handle handle; | |
735 | struct i2c_acpi_handler_data *data; | |
736 | acpi_status status; | |
737 | ||
738 | if (!adapter->dev.parent) | |
739 | return; | |
740 | ||
741 | handle = ACPI_HANDLE(adapter->dev.parent); | |
742 | ||
743 | if (!handle) | |
744 | return; | |
745 | ||
746 | acpi_remove_address_space_handler(handle, | |
747 | ACPI_ADR_SPACE_GSBUS, | |
748 | &i2c_acpi_space_handler); | |
749 | ||
750 | status = acpi_bus_get_private_data(handle, (void **)&data); | |
751 | if (ACPI_SUCCESS(status)) | |
752 | kfree(data); | |
753 | ||
754 | acpi_bus_detach_private_data(handle); | |
755 | } | |
756 | #endif /* CONFIG_ACPI_I2C_OPREGION */ |