1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Linux I2C core ACPI support code
4 *
5 * Copyright (C) 2014 Intel Corp, Author: Lan Tianyu <tianyu.lan@intel.com>
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 u32 force_speed;
43 };
44
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 */
i2c_acpi_get_i2c_resource(struct acpi_resource * ares,struct acpi_resource_i2c_serialbus ** i2c)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
i2c_acpi_fill_info(struct acpi_resource * ares,void * data)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
79 if (info->addr || !i2c_acpi_get_i2c_resource(ares, &sb))
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);
88 if (ACPI_FAILURE(status))
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
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
i2c_acpi_do_lookup(struct acpi_device * adev,struct i2c_acpi_lookup * lookup)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
115 if (acpi_bus_get_status(adev) || !adev->status.present)
116 return -EINVAL;
117
118 if (acpi_match_device_ids(adev, i2c_acpi_ignored_device_ids) == 0)
119 return -ENODEV;
120
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
i2c_acpi_add_resource(struct acpi_resource * ares,void * data)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
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 */
i2c_acpi_get_irq(struct i2c_client * client)155 int i2c_acpi_get_irq(struct i2c_client *client)
156 {
157 struct acpi_device *adev = ACPI_COMPANION(&client->dev);
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
171 if (irq == -ENOENT)
172 irq = acpi_dev_gpio_irq_get(adev, 0);
173
174 return irq;
175 }
176
i2c_acpi_get_info(struct acpi_device * adev,struct i2c_board_info * info,struct i2c_adapter * adapter,acpi_handle * adapter_handle)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 {
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
189 if (acpi_device_enumerated(adev))
190 return -EINVAL;
191
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
215 acpi_set_modalias(adev, dev_name(&adev->dev), info->type,
216 sizeof(info->type));
217
218 return 0;
219 }
220
i2c_acpi_register_device(struct i2c_adapter * adapter,struct acpi_device * adev,struct i2c_board_info * info)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
228 if (IS_ERR(i2c_new_client_device(adapter, info))) {
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
i2c_acpi_add_device(acpi_handle handle,u32 level,void * data,void ** return_value)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 */
i2c_acpi_register_devices(struct i2c_adapter * adap)264 void i2c_acpi_register_devices(struct i2c_adapter *adap)
265 {
266 acpi_status status;
267 acpi_handle handle;
268
269 if (!has_acpi_companion(&adap->dev))
270 return;
271
272 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
273 I2C_ACPI_MAX_SCAN_DEPTH,
274 i2c_acpi_add_device, NULL,
275 adap, NULL);
276 if (ACPI_FAILURE(status))
277 dev_warn(&adap->dev, "failed to enumerate I2C slaves\n");
278
279 if (!adap->dev.parent)
280 return;
281
282 handle = ACPI_HANDLE(adap->dev.parent);
283 if (!handle)
284 return;
285
286 acpi_walk_dep_device_list(handle);
287 }
288
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
i2c_acpi_lookup_speed(acpi_handle handle,u32 level,void * data,void ** return_value)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
320 if (acpi_match_device_ids(adev, i2c_acpi_force_400khz_device_ids) == 0)
321 lookup->force_speed = I2C_MAX_FAST_MODE_FREQ;
322
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 */
i2c_acpi_find_bus_speed(struct device * dev)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
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 }
370 }
371 EXPORT_SYMBOL_GPL(i2c_acpi_find_bus_speed);
372
i2c_acpi_find_match_adapter(struct device * dev,const void * data)373 static int i2c_acpi_find_match_adapter(struct device *dev, const void *data)
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
i2c_acpi_find_adapter_by_handle(acpi_handle handle)383 struct i2c_adapter *i2c_acpi_find_adapter_by_handle(acpi_handle handle)
384 {
385 struct device *dev;
386
387 dev = bus_find_device(&i2c_bus_type, NULL, handle,
388 i2c_acpi_find_match_adapter);
389
390 return dev ? i2c_verify_adapter(dev) : NULL;
391 }
392 EXPORT_SYMBOL_GPL(i2c_acpi_find_adapter_by_handle);
393
i2c_acpi_find_client_by_adev(struct acpi_device * adev)394 static struct i2c_client *i2c_acpi_find_client_by_adev(struct acpi_device *adev)
395 {
396 struct device *dev;
397 struct i2c_client *client;
398
399 dev = bus_find_device_by_acpi_dev(&i2c_bus_type, adev);
400 if (!dev)
401 return NULL;
402
403 client = i2c_verify_client(dev);
404 if (!client)
405 put_device(dev);
406
407 return client;
408 }
409
i2c_acpi_notify(struct notifier_block * nb,unsigned long value,void * arg)410 static int i2c_acpi_notify(struct notifier_block *nb, unsigned long value,
411 void *arg)
412 {
413 struct acpi_device *adev = arg;
414 struct i2c_board_info info;
415 acpi_handle adapter_handle;
416 struct i2c_adapter *adapter;
417 struct i2c_client *client;
418
419 switch (value) {
420 case ACPI_RECONFIG_DEVICE_ADD:
421 if (i2c_acpi_get_info(adev, &info, NULL, &adapter_handle))
422 break;
423
424 adapter = i2c_acpi_find_adapter_by_handle(adapter_handle);
425 if (!adapter)
426 break;
427
428 i2c_acpi_register_device(adapter, adev, &info);
429 put_device(&adapter->dev);
430 break;
431 case ACPI_RECONFIG_DEVICE_REMOVE:
432 if (!acpi_device_enumerated(adev))
433 break;
434
435 client = i2c_acpi_find_client_by_adev(adev);
436 if (!client)
437 break;
438
439 i2c_unregister_device(client);
440 put_device(&client->dev);
441 break;
442 }
443
444 return NOTIFY_OK;
445 }
446
447 struct notifier_block i2c_acpi_notifier = {
448 .notifier_call = i2c_acpi_notify,
449 };
450
451 /**
452 * i2c_acpi_new_device - Create i2c-client for the Nth I2cSerialBus resource
453 * @dev: Device owning the ACPI resources to get the client from
454 * @index: Index of ACPI resource to get
455 * @info: describes the I2C device; note this is modified (addr gets set)
456 * Context: can sleep
457 *
458 * By default the i2c subsys creates an i2c-client for the first I2cSerialBus
459 * resource of an acpi_device, but some acpi_devices have multiple I2cSerialBus
460 * resources, in that case this function can be used to create an i2c-client
461 * for other I2cSerialBus resources in the Current Resource Settings table.
462 *
463 * Also see i2c_new_client_device, which this function calls to create the
464 * i2c-client.
465 *
466 * Returns a pointer to the new i2c-client, or error pointer in case of failure.
467 * Specifically, -EPROBE_DEFER is returned if the adapter is not found.
468 */
i2c_acpi_new_device(struct device * dev,int index,struct i2c_board_info * info)469 struct i2c_client *i2c_acpi_new_device(struct device *dev, int index,
470 struct i2c_board_info *info)
471 {
472 struct acpi_device *adev = ACPI_COMPANION(dev);
473 struct i2c_acpi_lookup lookup;
474 struct i2c_adapter *adapter;
475 LIST_HEAD(resource_list);
476 int ret;
477
478 memset(&lookup, 0, sizeof(lookup));
479 lookup.info = info;
480 lookup.device_handle = acpi_device_handle(adev);
481 lookup.index = index;
482
483 ret = acpi_dev_get_resources(adev, &resource_list,
484 i2c_acpi_fill_info, &lookup);
485 if (ret < 0)
486 return ERR_PTR(ret);
487
488 acpi_dev_free_resource_list(&resource_list);
489
490 if (!info->addr)
491 return ERR_PTR(-EADDRNOTAVAIL);
492
493 adapter = i2c_acpi_find_adapter_by_handle(lookup.adapter_handle);
494 if (!adapter)
495 return ERR_PTR(-EPROBE_DEFER);
496
497 return i2c_new_client_device(adapter, info);
498 }
499 EXPORT_SYMBOL_GPL(i2c_acpi_new_device);
500
501 #ifdef CONFIG_ACPI_I2C_OPREGION
acpi_gsb_i2c_read_bytes(struct i2c_client * client,u8 cmd,u8 * data,u8 data_len)502 static int acpi_gsb_i2c_read_bytes(struct i2c_client *client,
503 u8 cmd, u8 *data, u8 data_len)
504 {
505
506 struct i2c_msg msgs[2];
507 int ret;
508 u8 *buffer;
509
510 buffer = kzalloc(data_len, GFP_KERNEL);
511 if (!buffer)
512 return AE_NO_MEMORY;
513
514 msgs[0].addr = client->addr;
515 msgs[0].flags = client->flags;
516 msgs[0].len = 1;
517 msgs[0].buf = &cmd;
518
519 msgs[1].addr = client->addr;
520 msgs[1].flags = client->flags | I2C_M_RD;
521 msgs[1].len = data_len;
522 msgs[1].buf = buffer;
523
524 ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
525 if (ret < 0) {
526 /* Getting a NACK is unfortunately normal with some DSTDs */
527 if (ret == -EREMOTEIO)
528 dev_dbg(&client->adapter->dev, "i2c read %d bytes from client@%#x starting at reg %#x failed, error: %d\n",
529 data_len, client->addr, cmd, ret);
530 else
531 dev_err(&client->adapter->dev, "i2c read %d bytes from client@%#x starting at reg %#x failed, error: %d\n",
532 data_len, client->addr, cmd, ret);
533 /* 2 transfers must have completed successfully */
534 } else if (ret == 2) {
535 memcpy(data, buffer, data_len);
536 ret = 0;
537 } else {
538 ret = -EIO;
539 }
540
541 kfree(buffer);
542 return ret;
543 }
544
acpi_gsb_i2c_write_bytes(struct i2c_client * client,u8 cmd,u8 * data,u8 data_len)545 static int acpi_gsb_i2c_write_bytes(struct i2c_client *client,
546 u8 cmd, u8 *data, u8 data_len)
547 {
548
549 struct i2c_msg msgs[1];
550 u8 *buffer;
551 int ret = AE_OK;
552
553 buffer = kzalloc(data_len + 1, GFP_KERNEL);
554 if (!buffer)
555 return AE_NO_MEMORY;
556
557 buffer[0] = cmd;
558 memcpy(buffer + 1, data, data_len);
559
560 msgs[0].addr = client->addr;
561 msgs[0].flags = client->flags;
562 msgs[0].len = data_len + 1;
563 msgs[0].buf = buffer;
564
565 ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
566
567 kfree(buffer);
568
569 if (ret < 0) {
570 dev_err(&client->adapter->dev, "i2c write failed: %d\n", ret);
571 return ret;
572 }
573
574 /* 1 transfer must have completed successfully */
575 return (ret == 1) ? 0 : -EIO;
576 }
577
578 static acpi_status
i2c_acpi_space_handler(u32 function,acpi_physical_address command,u32 bits,u64 * value64,void * handler_context,void * region_context)579 i2c_acpi_space_handler(u32 function, acpi_physical_address command,
580 u32 bits, u64 *value64,
581 void *handler_context, void *region_context)
582 {
583 struct gsb_buffer *gsb = (struct gsb_buffer *)value64;
584 struct i2c_acpi_handler_data *data = handler_context;
585 struct acpi_connection_info *info = &data->info;
586 struct acpi_resource_i2c_serialbus *sb;
587 struct i2c_adapter *adapter = data->adapter;
588 struct i2c_client *client;
589 struct acpi_resource *ares;
590 u32 accessor_type = function >> 16;
591 u8 action = function & ACPI_IO_MASK;
592 acpi_status ret;
593 int status;
594
595 ret = acpi_buffer_to_resource(info->connection, info->length, &ares);
596 if (ACPI_FAILURE(ret))
597 return ret;
598
599 client = kzalloc(sizeof(*client), GFP_KERNEL);
600 if (!client) {
601 ret = AE_NO_MEMORY;
602 goto err;
603 }
604
605 if (!value64 || !i2c_acpi_get_i2c_resource(ares, &sb)) {
606 ret = AE_BAD_PARAMETER;
607 goto err;
608 }
609
610 client->adapter = adapter;
611 client->addr = sb->slave_address;
612
613 if (sb->access_mode == ACPI_I2C_10BIT_MODE)
614 client->flags |= I2C_CLIENT_TEN;
615
616 switch (accessor_type) {
617 case ACPI_GSB_ACCESS_ATTRIB_SEND_RCV:
618 if (action == ACPI_READ) {
619 status = i2c_smbus_read_byte(client);
620 if (status >= 0) {
621 gsb->bdata = status;
622 status = 0;
623 }
624 } else {
625 status = i2c_smbus_write_byte(client, gsb->bdata);
626 }
627 break;
628
629 case ACPI_GSB_ACCESS_ATTRIB_BYTE:
630 if (action == ACPI_READ) {
631 status = i2c_smbus_read_byte_data(client, command);
632 if (status >= 0) {
633 gsb->bdata = status;
634 status = 0;
635 }
636 } else {
637 status = i2c_smbus_write_byte_data(client, command,
638 gsb->bdata);
639 }
640 break;
641
642 case ACPI_GSB_ACCESS_ATTRIB_WORD:
643 if (action == ACPI_READ) {
644 status = i2c_smbus_read_word_data(client, command);
645 if (status >= 0) {
646 gsb->wdata = status;
647 status = 0;
648 }
649 } else {
650 status = i2c_smbus_write_word_data(client, command,
651 gsb->wdata);
652 }
653 break;
654
655 case ACPI_GSB_ACCESS_ATTRIB_BLOCK:
656 if (action == ACPI_READ) {
657 status = i2c_smbus_read_block_data(client, command,
658 gsb->data);
659 if (status >= 0) {
660 gsb->len = status;
661 status = 0;
662 }
663 } else {
664 status = i2c_smbus_write_block_data(client, command,
665 gsb->len, gsb->data);
666 }
667 break;
668
669 case ACPI_GSB_ACCESS_ATTRIB_MULTIBYTE:
670 if (action == ACPI_READ) {
671 status = acpi_gsb_i2c_read_bytes(client, command,
672 gsb->data, info->access_length);
673 } else {
674 status = acpi_gsb_i2c_write_bytes(client, command,
675 gsb->data, info->access_length);
676 }
677 break;
678
679 default:
680 dev_warn(&adapter->dev, "protocol 0x%02x not supported for client 0x%02x\n",
681 accessor_type, client->addr);
682 ret = AE_BAD_PARAMETER;
683 goto err;
684 }
685
686 gsb->status = status;
687
688 err:
689 kfree(client);
690 ACPI_FREE(ares);
691 return ret;
692 }
693
694
i2c_acpi_install_space_handler(struct i2c_adapter * adapter)695 int i2c_acpi_install_space_handler(struct i2c_adapter *adapter)
696 {
697 acpi_handle handle;
698 struct i2c_acpi_handler_data *data;
699 acpi_status status;
700
701 if (!adapter->dev.parent)
702 return -ENODEV;
703
704 handle = ACPI_HANDLE(adapter->dev.parent);
705
706 if (!handle)
707 return -ENODEV;
708
709 data = kzalloc(sizeof(struct i2c_acpi_handler_data),
710 GFP_KERNEL);
711 if (!data)
712 return -ENOMEM;
713
714 data->adapter = adapter;
715 status = acpi_bus_attach_private_data(handle, (void *)data);
716 if (ACPI_FAILURE(status)) {
717 kfree(data);
718 return -ENOMEM;
719 }
720
721 status = acpi_install_address_space_handler(handle,
722 ACPI_ADR_SPACE_GSBUS,
723 &i2c_acpi_space_handler,
724 NULL,
725 data);
726 if (ACPI_FAILURE(status)) {
727 dev_err(&adapter->dev, "Error installing i2c space handler\n");
728 acpi_bus_detach_private_data(handle);
729 kfree(data);
730 return -ENOMEM;
731 }
732
733 return 0;
734 }
735
i2c_acpi_remove_space_handler(struct i2c_adapter * adapter)736 void i2c_acpi_remove_space_handler(struct i2c_adapter *adapter)
737 {
738 acpi_handle handle;
739 struct i2c_acpi_handler_data *data;
740 acpi_status status;
741
742 if (!adapter->dev.parent)
743 return;
744
745 handle = ACPI_HANDLE(adapter->dev.parent);
746
747 if (!handle)
748 return;
749
750 acpi_remove_address_space_handler(handle,
751 ACPI_ADR_SPACE_GSBUS,
752 &i2c_acpi_space_handler);
753
754 status = acpi_bus_get_private_data(handle, (void **)&data);
755 if (ACPI_SUCCESS(status))
756 kfree(data);
757
758 acpi_bus_detach_private_data(handle);
759 }
760 #endif /* CONFIG_ACPI_I2C_OPREGION */
761