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Merge tag 'pwm/for-5.16-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/thierry...
[linux-2.6-block.git] / drivers / i2c / i2c-core-acpi.c
CommitLineData
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
18struct i2c_acpi_handler_data {
19 struct acpi_connection_info info;
20 struct i2c_adapter *adapter;
21};
22
23struct gsb_buffer {
24 u8 status;
25 u8 len;
26 union {
27 u16 wdata;
28 u8 bdata;
29 u8 data[0];
30 };
31} __packed;
32
33struct 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 */
55bool 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}
70EXPORT_SYMBOL_GPL(i2c_acpi_get_i2c_resource);
71
20a1b3ac
HG		 72static int i2c_acpi_resource_count(struct acpi_resource *ares, void *data)
73{
74 struct acpi_resource_i2c_serialbus *sb;
75 int *count = data;
76
77 if (i2c_acpi_get_i2c_resource(ares, &sb))
78 *count = *count + 1;
79
80 return 1;
81}
82
83/**
84 * i2c_acpi_client_count - Count the number of I2cSerialBus resources
85 * @adev: ACPI device
86 *
87 * Returns the number of I2cSerialBus resources in the ACPI-device's
88 * resource-list; or a negative error code.
89 */
90int i2c_acpi_client_count(struct acpi_device *adev)
91{
92 int ret, count = 0;
93 LIST_HEAD(r);
94
95 ret = acpi_dev_get_resources(adev, &r, i2c_acpi_resource_count, &count);
96 if (ret < 0)
97 return ret;
98
99 acpi_dev_free_resource_list(&r);
100 return count;
101}
102EXPORT_SYMBOL_GPL(i2c_acpi_client_count);
103
53f8f7c5
WS		 104static int i2c_acpi_fill_info(struct acpi_resource *ares, void *data)
105{
106 struct i2c_acpi_lookup *lookup = data;
107 struct i2c_board_info *info = lookup->info;
108 struct acpi_resource_i2c_serialbus *sb;
109 acpi_status status;
110
0d5102fe 111 if (info->addr || !i2c_acpi_get_i2c_resource(ares, &sb))
53f8f7c5
WS		 112 return 1;
113
114 if (lookup->index != -1 && lookup->n++ != lookup->index)
115 return 1;
116
117 status = acpi_get_handle(lookup->device_handle,
118 sb->resource_source.string_ptr,
119 &lookup->adapter_handle);
5f59d6a1 120 if (ACPI_FAILURE(status))
53f8f7c5
WS		 121 return 1;
122
123 info->addr = sb->slave_address;
124 lookup->speed = sb->connection_speed;
125 if (sb->access_mode == ACPI_I2C_10BIT_MODE)
126 info->flags |= I2C_CLIENT_TEN;
127
128 return 1;
129}
130
3a4991a9
HG		 131static const struct acpi_device_id i2c_acpi_ignored_device_ids[] = {
132 /*
133 * ACPI video acpi_devices, which are handled by the acpi-video driver
134 * sometimes contain a SERIAL_TYPE_I2C ACPI resource, ignore these.
135 */
136 { ACPI_VIDEO_HID, 0 },
137 {}
138};
139
53f8f7c5
WS		 140static int i2c_acpi_do_lookup(struct acpi_device *adev,
141 struct i2c_acpi_lookup *lookup)
142{
143 struct i2c_board_info *info = lookup->info;
144 struct list_head resource_list;
145 int ret;
146
4befedc0 147 if (acpi_bus_get_status(adev) || !adev->status.present)
53f8f7c5
WS		 148 return -EINVAL;
149
3a4991a9
HG		 150 if (acpi_match_device_ids(adev, i2c_acpi_ignored_device_ids) == 0)
151 return -ENODEV;
152
53f8f7c5
WS		 153 memset(info, 0, sizeof(*info));
154 lookup->device_handle = acpi_device_handle(adev);
155
156 /* Look up for I2cSerialBus resource */
157 INIT_LIST_HEAD(&resource_list);
158 ret = acpi_dev_get_resources(adev, &resource_list,
159 i2c_acpi_fill_info, lookup);
160 acpi_dev_free_resource_list(&resource_list);
161
162 if (ret < 0 || !info->addr)
163 return -EINVAL;
164
165 return 0;
166}
167
c2223ddc
CK		 168static int i2c_acpi_add_resource(struct acpi_resource *ares, void *data)
169{
170 int *irq = data;
171 struct resource r;
172
173 if (*irq <= 0 && acpi_dev_resource_interrupt(ares, 0, &r))
174 *irq = i2c_dev_irq_from_resources(&r, 1);
175
176 return 1; /* No need to add resource to the list */
177}
178
16c9db1d
CK		 179/**
180 * i2c_acpi_get_irq - get device IRQ number from ACPI
181 * @client: Pointer to the I2C client device
182 *
183 * Find the IRQ number used by a specific client device.
184 *
185 * Return: The IRQ number or an error code.
186 */
187int i2c_acpi_get_irq(struct i2c_client *client)
a52e3b37 188{
16c9db1d 189 struct acpi_device *adev = ACPI_COMPANION(&client->dev);
a52e3b37
CK		 190 struct list_head resource_list;
191 int irq = -ENOENT;
192 int ret;
193
194 INIT_LIST_HEAD(&resource_list);
195
196 ret = acpi_dev_get_resources(adev, &resource_list,
197 i2c_acpi_add_resource, &irq);
198 if (ret < 0)
199 return ret;
200
201 acpi_dev_free_resource_list(&resource_list);
202
8466b616
CK		 203 if (irq == -ENOENT)
204 irq = acpi_dev_gpio_irq_get(adev, 0);
205
a52e3b37
CK		 206 return irq;
207}
208
53f8f7c5
WS		 209static int i2c_acpi_get_info(struct acpi_device *adev,
210 struct i2c_board_info *info,
211 struct i2c_adapter *adapter,
212 acpi_handle *adapter_handle)
213{
53f8f7c5
WS		 214 struct i2c_acpi_lookup lookup;
215 int ret;
216
217 memset(&lookup, 0, sizeof(lookup));
218 lookup.info = info;
219 lookup.index = -1;
220
4befedc0
AB		 221 if (acpi_device_enumerated(adev))
222 return -EINVAL;
223
53f8f7c5
WS		 224 ret = i2c_acpi_do_lookup(adev, &lookup);
225 if (ret)
226 return ret;
227
228 if (adapter) {
229 /* The adapter must match the one in I2cSerialBus() connector */
230 if (ACPI_HANDLE(&adapter->dev) != lookup.adapter_handle)
231 return -ENODEV;
232 } else {
233 struct acpi_device *adapter_adev;
234
235 /* The adapter must be present */
236 if (acpi_bus_get_device(lookup.adapter_handle, &adapter_adev))
237 return -ENODEV;
238 if (acpi_bus_get_status(adapter_adev) ||
239 !adapter_adev->status.present)
240 return -ENODEV;
241 }
242
243 info->fwnode = acpi_fwnode_handle(adev);
244 if (adapter_handle)
245 *adapter_handle = lookup.adapter_handle;
246
53f8f7c5
WS		 247 acpi_set_modalias(adev, dev_name(&adev->dev), info->type,
248 sizeof(info->type));
249
250 return 0;
251}
252
253static void i2c_acpi_register_device(struct i2c_adapter *adapter,
254 struct acpi_device *adev,
255 struct i2c_board_info *info)
256{
257 adev->power.flags.ignore_parent = true;
258 acpi_device_set_enumerated(adev);
259
785e21cf 260 if (IS_ERR(i2c_new_client_device(adapter, info)))
53f8f7c5 261 adev->power.flags.ignore_parent = false;
53f8f7c5
WS		 262}
263
264static acpi_status i2c_acpi_add_device(acpi_handle handle, u32 level,
265 void *data, void **return_value)
266{
267 struct i2c_adapter *adapter = data;
268 struct acpi_device *adev;
269 struct i2c_board_info info;
270
271 if (acpi_bus_get_device(handle, &adev))
272 return AE_OK;
273
274 if (i2c_acpi_get_info(adev, &info, adapter, NULL))
275 return AE_OK;
276
277 i2c_acpi_register_device(adapter, adev, &info);
278
279 return AE_OK;
280}
281
282#define I2C_ACPI_MAX_SCAN_DEPTH 32
283
284/**
285 * i2c_acpi_register_devices - enumerate I2C slave devices behind adapter
286 * @adap: pointer to adapter
287 *
288 * Enumerate all I2C slave devices behind this adapter by walking the ACPI
289 * namespace. When a device is found it will be added to the Linux device
290 * model and bound to the corresponding ACPI handle.
291 */
292void i2c_acpi_register_devices(struct i2c_adapter *adap)
293{
a9e10e58 294 struct acpi_device *adev;
53f8f7c5
WS		 295 acpi_status status;
296
297 if (!has_acpi_companion(&adap->dev))
298 return;
299
300 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
301 I2C_ACPI_MAX_SCAN_DEPTH,
302 i2c_acpi_add_device, NULL,
303 adap, NULL);
304 if (ACPI_FAILURE(status))
305 dev_warn(&adap->dev, "failed to enumerate I2C slaves\n");
8058d699
HG		 306
307 if (!adap->dev.parent)
308 return;
309
a9e10e58
DS		 310 adev = ACPI_COMPANION(adap->dev.parent);
311 if (!adev)
8058d699
HG		 312 return;
313
a9e10e58 314 acpi_dev_clear_dependencies(adev);
53f8f7c5
WS		 315}
316
7574c0db
HG		 317static const struct acpi_device_id i2c_acpi_force_400khz_device_ids[] = {
318 /*
319 * These Silead touchscreen controllers only work at 400KHz, for
320 * some reason they do not work at 100KHz. On some devices the ACPI
321 * tables list another device at their bus as only being capable
322 * of 100KHz, testing has shown that these other devices work fine
323 * at 400KHz (as can be expected of any recent i2c hw) so we force
324 * the speed of the bus to 400 KHz if a Silead device is present.
325 */
326 { "MSSL1680", 0 },
327 {}
328};
329
53f8f7c5
WS		 330static acpi_status i2c_acpi_lookup_speed(acpi_handle handle, u32 level,
331 void *data, void **return_value)
332{
333 struct i2c_acpi_lookup *lookup = data;
334 struct acpi_device *adev;
335
336 if (acpi_bus_get_device(handle, &adev))
337 return AE_OK;
338
339 if (i2c_acpi_do_lookup(adev, lookup))
340 return AE_OK;
341
342 if (lookup->search_handle != lookup->adapter_handle)
343 return AE_OK;
344
345 if (lookup->speed <= lookup->min_speed)
346 lookup->min_speed = lookup->speed;
347
7574c0db 348 if (acpi_match_device_ids(adev, i2c_acpi_force_400khz_device_ids) == 0)
e6282fc6 349 lookup->force_speed = I2C_MAX_FAST_MODE_FREQ;
7574c0db 350
53f8f7c5
WS		 351 return AE_OK;
352}
353
354/**
355 * i2c_acpi_find_bus_speed - find I2C bus speed from ACPI
356 * @dev: The device owning the bus
357 *
358 * Find the I2C bus speed by walking the ACPI namespace for all I2C slaves
359 * devices connected to this bus and use the speed of slowest device.
360 *
361 * Returns the speed in Hz or zero
362 */
363u32 i2c_acpi_find_bus_speed(struct device *dev)
364{
365 struct i2c_acpi_lookup lookup;
366 struct i2c_board_info dummy;
367 acpi_status status;
368
369 if (!has_acpi_companion(dev))
370 return 0;
371
372 memset(&lookup, 0, sizeof(lookup));
373 lookup.search_handle = ACPI_HANDLE(dev);
374 lookup.min_speed = UINT_MAX;
375 lookup.info = &dummy;
376 lookup.index = -1;
377
378 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
379 I2C_ACPI_MAX_SCAN_DEPTH,
380 i2c_acpi_lookup_speed, NULL,
381 &lookup, NULL);
382
383 if (ACPI_FAILURE(status)) {
384 dev_warn(dev, "unable to find I2C bus speed from ACPI\n");
385 return 0;
386 }
387
7574c0db
HG		 388 if (lookup.force_speed) {
389 if (lookup.force_speed != lookup.min_speed)
390 dev_warn(dev, FW_BUG "DSDT uses known not-working I2C bus speed %d, forcing it to %d\n",
391 lookup.min_speed, lookup.force_speed);
392 return lookup.force_speed;
393 } else if (lookup.min_speed != UINT_MAX) {
394 return lookup.min_speed;
395 } else {
396 return 0;
397 }
53f8f7c5
WS		 398}
399EXPORT_SYMBOL_GPL(i2c_acpi_find_bus_speed);
400
1e91a2e5 401struct i2c_adapter *i2c_acpi_find_adapter_by_handle(acpi_handle handle)
53f8f7c5 402{
0a2d47aa 403 struct i2c_adapter *adapter;
644bf600
SP		 404 struct device *dev;
405
0a2d47aa
AS		 406 dev = bus_find_device(&i2c_bus_type, NULL, handle, device_match_acpi_handle);
407 if (!dev)
408 return NULL;
409
410 adapter = i2c_verify_adapter(dev);
411 if (!adapter)
412 put_device(dev);
53f8f7c5 413
0a2d47aa 414 return adapter;
53f8f7c5 415}
1e91a2e5 416EXPORT_SYMBOL_GPL(i2c_acpi_find_adapter_by_handle);
53f8f7c5
WS		 417
418static struct i2c_client *i2c_acpi_find_client_by_adev(struct acpi_device *adev)
419{
420 struct device *dev;
8daee952 421 struct i2c_client *client;
53f8f7c5 422
00500147 423 dev = bus_find_device_by_acpi_dev(&i2c_bus_type, adev);
8daee952
WS		 424 if (!dev)
425 return NULL;
426
427 client = i2c_verify_client(dev);
428 if (!client)
429 put_device(dev);
430
431 return client;
53f8f7c5
WS		 432}
433
434static int i2c_acpi_notify(struct notifier_block *nb, unsigned long value,
435 void *arg)
436{
437 struct acpi_device *adev = arg;
438 struct i2c_board_info info;
439 acpi_handle adapter_handle;
440 struct i2c_adapter *adapter;
441 struct i2c_client *client;
442
443 switch (value) {
444 case ACPI_RECONFIG_DEVICE_ADD:
445 if (i2c_acpi_get_info(adev, &info, NULL, &adapter_handle))
446 break;
447
448 adapter = i2c_acpi_find_adapter_by_handle(adapter_handle);
449 if (!adapter)
450 break;
451
452 i2c_acpi_register_device(adapter, adev, &info);
6558b646 453 put_device(&adapter->dev);
53f8f7c5
WS		 454 break;
455 case ACPI_RECONFIG_DEVICE_REMOVE:
456 if (!acpi_device_enumerated(adev))
457 break;
458
459 client = i2c_acpi_find_client_by_adev(adev);
460 if (!client)
461 break;
462
463 i2c_unregister_device(client);
464 put_device(&client->dev);
465 break;
466 }
467
468 return NOTIFY_OK;
469}
470
471struct notifier_block i2c_acpi_notifier = {
472 .notifier_call = i2c_acpi_notify,
473};
474
475/**
476 * i2c_acpi_new_device - Create i2c-client for the Nth I2cSerialBus resource
477 * @dev: Device owning the ACPI resources to get the client from
478 * @index: Index of ACPI resource to get
479 * @info: describes the I2C device; note this is modified (addr gets set)
480 * Context: can sleep
481 *
482 * By default the i2c subsys creates an i2c-client for the first I2cSerialBus
483 * resource of an acpi_device, but some acpi_devices have multiple I2cSerialBus
484 * resources, in that case this function can be used to create an i2c-client
485 * for other I2cSerialBus resources in the Current Resource Settings table.
486 *
90a3be9b
WS		 487 * Also see i2c_new_client_device, which this function calls to create the
488 * i2c-client.
53f8f7c5 489 *
2dea645f
AS		 490 * Returns a pointer to the new i2c-client, or error pointer in case of failure.
491 * Specifically, -EPROBE_DEFER is returned if the adapter is not found.
53f8f7c5
WS		 492 */
493struct i2c_client *i2c_acpi_new_device(struct device *dev, int index,
494 struct i2c_board_info *info)
495{
3e34b513 496 struct acpi_device *adev = ACPI_COMPANION(dev);
53f8f7c5
WS		 497 struct i2c_acpi_lookup lookup;
498 struct i2c_adapter *adapter;
53f8f7c5
WS		 499 LIST_HEAD(resource_list);
500 int ret;
501
53f8f7c5
WS		 502 memset(&lookup, 0, sizeof(lookup));
503 lookup.info = info;
504 lookup.device_handle = acpi_device_handle(adev);
505 lookup.index = index;
506
507 ret = acpi_dev_get_resources(adev, &resource_list,
508 i2c_acpi_fill_info, &lookup);
2dea645f
AS		 509 if (ret < 0)
510 return ERR_PTR(ret);
511
53f8f7c5
WS		 512 acpi_dev_free_resource_list(&resource_list);
513
2dea645f
AS		 514 if (!info->addr)
515 return ERR_PTR(-EADDRNOTAVAIL);
53f8f7c5
WS		 516
517 adapter = i2c_acpi_find_adapter_by_handle(lookup.adapter_handle);
518 if (!adapter)
2dea645f
AS		 519 return ERR_PTR(-EPROBE_DEFER);
520
90a3be9b 521 return i2c_new_client_device(adapter, info);
53f8f7c5
WS		 522}
523EXPORT_SYMBOL_GPL(i2c_acpi_new_device);
524
b18c1ad6
SA		 525bool i2c_acpi_waive_d0_probe(struct device *dev)
526{
527 struct i2c_driver *driver = to_i2c_driver(dev->driver);
528 struct acpi_device *adev = ACPI_COMPANION(dev);
529
530 return driver->flags & I2C_DRV_ACPI_WAIVE_D0_PROBE &&
531 adev && adev->power.state_for_enumeration >= adev->power.state;
532}
533EXPORT_SYMBOL_GPL(i2c_acpi_waive_d0_probe);
534
53f8f7c5
WS		 535#ifdef CONFIG_ACPI_I2C_OPREGION
536static int acpi_gsb_i2c_read_bytes(struct i2c_client *client,
537 u8 cmd, u8 *data, u8 data_len)
538{
539
540 struct i2c_msg msgs[2];
541 int ret;
542 u8 *buffer;
543
544 buffer = kzalloc(data_len, GFP_KERNEL);
545 if (!buffer)
546 return AE_NO_MEMORY;
547
548 msgs[0].addr = client->addr;
549 msgs[0].flags = client->flags;
550 msgs[0].len = 1;
551 msgs[0].buf = &cmd;
552
553 msgs[1].addr = client->addr;
554 msgs[1].flags = client->flags | I2C_M_RD;
555 msgs[1].len = data_len;
556 msgs[1].buf = buffer;
557
558 ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
7781edae
HG		 559 if (ret < 0) {
560 /* Getting a NACK is unfortunately normal with some DSTDs */
561 if (ret == -EREMOTEIO)
562 dev_dbg(&client->adapter->dev, "i2c read %d bytes from client@%#x starting at reg %#x failed, error: %d\n",
563 data_len, client->addr, cmd, ret);
564 else
565 dev_err(&client->adapter->dev, "i2c read %d bytes from client@%#x starting at reg %#x failed, error: %d\n",
566 data_len, client->addr, cmd, ret);
0a30446c
HG		 567 /* 2 transfers must have completed successfully */
568 } else if (ret == 2) {
53f8f7c5 569 memcpy(data, buffer, data_len);
0a30446c
HG		 570 ret = 0;
571 } else {
572 ret = -EIO;
7781edae 573 }
53f8f7c5
WS		 574
575 kfree(buffer);
576 return ret;
577}
578
579static int acpi_gsb_i2c_write_bytes(struct i2c_client *client,
580 u8 cmd, u8 *data, u8 data_len)
581{
582
583 struct i2c_msg msgs[1];
584 u8 *buffer;
585 int ret = AE_OK;
586
587 buffer = kzalloc(data_len + 1, GFP_KERNEL);
588 if (!buffer)
589 return AE_NO_MEMORY;
590
591 buffer[0] = cmd;
592 memcpy(buffer + 1, data, data_len);
593
594 msgs[0].addr = client->addr;
595 msgs[0].flags = client->flags;
596 msgs[0].len = data_len + 1;
597 msgs[0].buf = buffer;
598
599 ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
53f8f7c5
WS		 600
601 kfree(buffer);
c463a158
HG		 602
603 if (ret < 0) {
604 dev_err(&client->adapter->dev, "i2c write failed: %d\n", ret);
605 return ret;
606 }
607
608 /* 1 transfer must have completed successfully */
609 return (ret == 1) ? 0 : -EIO;
53f8f7c5
WS		 610}
611
612static acpi_status
613i2c_acpi_space_handler(u32 function, acpi_physical_address command,
614 u32 bits, u64 *value64,
615 void *handler_context, void *region_context)
616{
617 struct gsb_buffer *gsb = (struct gsb_buffer *)value64;
618 struct i2c_acpi_handler_data *data = handler_context;
619 struct acpi_connection_info *info = &data->info;
620 struct acpi_resource_i2c_serialbus *sb;
621 struct i2c_adapter *adapter = data->adapter;
622 struct i2c_client *client;
623 struct acpi_resource *ares;
624 u32 accessor_type = function >> 16;
625 u8 action = function & ACPI_IO_MASK;
626 acpi_status ret;
627 int status;
628
629 ret = acpi_buffer_to_resource(info->connection, info->length, &ares);
630 if (ACPI_FAILURE(ret))
631 return ret;
632
633 client = kzalloc(sizeof(*client), GFP_KERNEL);
634 if (!client) {
635 ret = AE_NO_MEMORY;
636 goto err;
637 }
638
0d5102fe 639 if (!value64 || !i2c_acpi_get_i2c_resource(ares, &sb)) {
53f8f7c5
WS		 640 ret = AE_BAD_PARAMETER;
641 goto err;
642 }
643
644 client->adapter = adapter;
645 client->addr = sb->slave_address;
646
647 if (sb->access_mode == ACPI_I2C_10BIT_MODE)
648 client->flags |= I2C_CLIENT_TEN;
649
650 switch (accessor_type) {
651 case ACPI_GSB_ACCESS_ATTRIB_SEND_RCV:
652 if (action == ACPI_READ) {
653 status = i2c_smbus_read_byte(client);
654 if (status >= 0) {
655 gsb->bdata = status;
656 status = 0;
657 }
658 } else {
659 status = i2c_smbus_write_byte(client, gsb->bdata);
660 }
661 break;
662
663 case ACPI_GSB_ACCESS_ATTRIB_BYTE:
664 if (action == ACPI_READ) {
665 status = i2c_smbus_read_byte_data(client, command);
666 if (status >= 0) {
667 gsb->bdata = status;
668 status = 0;
669 }
670 } else {
671 status = i2c_smbus_write_byte_data(client, command,
672 gsb->bdata);
673 }
674 break;
675
676 case ACPI_GSB_ACCESS_ATTRIB_WORD:
677 if (action == ACPI_READ) {
678 status = i2c_smbus_read_word_data(client, command);
679 if (status >= 0) {
680 gsb->wdata = status;
681 status = 0;
682 }
683 } else {
684 status = i2c_smbus_write_word_data(client, command,
685 gsb->wdata);
686 }
687 break;
688
689 case ACPI_GSB_ACCESS_ATTRIB_BLOCK:
690 if (action == ACPI_READ) {
691 status = i2c_smbus_read_block_data(client, command,
692 gsb->data);
693 if (status >= 0) {
694 gsb->len = status;
695 status = 0;
696 }
697 } else {
698 status = i2c_smbus_write_block_data(client, command,
699 gsb->len, gsb->data);
700 }
701 break;
702
703 case ACPI_GSB_ACCESS_ATTRIB_MULTIBYTE:
704 if (action == ACPI_READ) {
705 status = acpi_gsb_i2c_read_bytes(client, command,
706 gsb->data, info->access_length);
53f8f7c5
WS		 707 } else {
708 status = acpi_gsb_i2c_write_bytes(client, command,
709 gsb->data, info->access_length);
710 }
711 break;
712
713 default:
714 dev_warn(&adapter->dev, "protocol 0x%02x not supported for client 0x%02x\n",
715 accessor_type, client->addr);
716 ret = AE_BAD_PARAMETER;
717 goto err;
718 }
719
720 gsb->status = status;
721
722 err:
723 kfree(client);
724 ACPI_FREE(ares);
725 return ret;
726}
727
728
729int i2c_acpi_install_space_handler(struct i2c_adapter *adapter)
730{
731 acpi_handle handle;
732 struct i2c_acpi_handler_data *data;
733 acpi_status status;
734
735 if (!adapter->dev.parent)
736 return -ENODEV;
737
738 handle = ACPI_HANDLE(adapter->dev.parent);
739
740 if (!handle)
741 return -ENODEV;
742
743 data = kzalloc(sizeof(struct i2c_acpi_handler_data),
744 GFP_KERNEL);
745 if (!data)
746 return -ENOMEM;
747
748 data->adapter = adapter;
749 status = acpi_bus_attach_private_data(handle, (void *)data);
750 if (ACPI_FAILURE(status)) {
751 kfree(data);
752 return -ENOMEM;
753 }
754
755 status = acpi_install_address_space_handler(handle,
756 ACPI_ADR_SPACE_GSBUS,
757 &i2c_acpi_space_handler,
758 NULL,
759 data);
760 if (ACPI_FAILURE(status)) {
761 dev_err(&adapter->dev, "Error installing i2c space handler\n");
762 acpi_bus_detach_private_data(handle);
763 kfree(data);
764 return -ENOMEM;
765 }
766
53f8f7c5
WS		 767 return 0;
768}
769
770void i2c_acpi_remove_space_handler(struct i2c_adapter *adapter)
771{
772 acpi_handle handle;
773 struct i2c_acpi_handler_data *data;
774 acpi_status status;
775
776 if (!adapter->dev.parent)
777 return;
778
779 handle = ACPI_HANDLE(adapter->dev.parent);
780
781 if (!handle)
782 return;
783
784 acpi_remove_address_space_handler(handle,
785 ACPI_ADR_SPACE_GSBUS,
786 &i2c_acpi_space_handler);
787
788 status = acpi_bus_get_private_data(handle, (void **)&data);
789 if (ACPI_SUCCESS(status))
790 kfree(data);
791
792 acpi_bus_detach_private_data(handle);
793}
794#endif /* CONFIG_ACPI_I2C_OPREGION */
Linux 6.x block layer and io_uring tree(s)