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i2c: bcm2835: Fix the error handling in 'bcm2835_i2c_probe()'
[linux-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
fb90e58f 147 if (acpi_bus_get_status(adev))
53f8f7c5
WS		 148 return -EINVAL;
149
fb90e58f
HG		 150 if (!acpi_dev_ready_for_enumeration(adev))
151 return -ENODEV;
152
3a4991a9
HG		 153 if (acpi_match_device_ids(adev, i2c_acpi_ignored_device_ids) == 0)
154 return -ENODEV;
155
53f8f7c5
WS		 156 memset(info, 0, sizeof(*info));
157 lookup->device_handle = acpi_device_handle(adev);
158
159 /* Look up for I2cSerialBus resource */
160 INIT_LIST_HEAD(&resource_list);
161 ret = acpi_dev_get_resources(adev, &resource_list,
162 i2c_acpi_fill_info, lookup);
163 acpi_dev_free_resource_list(&resource_list);
164
165 if (ret < 0 || !info->addr)
166 return -EINVAL;
167
168 return 0;
169}
170
c2223ddc
CK		 171static int i2c_acpi_add_resource(struct acpi_resource *ares, void *data)
172{
173 int *irq = data;
174 struct resource r;
175
176 if (*irq <= 0 && acpi_dev_resource_interrupt(ares, 0, &r))
177 *irq = i2c_dev_irq_from_resources(&r, 1);
178
179 return 1; /* No need to add resource to the list */
180}
181
16c9db1d
CK		 182/**
183 * i2c_acpi_get_irq - get device IRQ number from ACPI
184 * @client: Pointer to the I2C client device
185 *
186 * Find the IRQ number used by a specific client device.
187 *
188 * Return: The IRQ number or an error code.
189 */
190int i2c_acpi_get_irq(struct i2c_client *client)
a52e3b37 191{
16c9db1d 192 struct acpi_device *adev = ACPI_COMPANION(&client->dev);
a52e3b37
CK		 193 struct list_head resource_list;
194 int irq = -ENOENT;
195 int ret;
196
197 INIT_LIST_HEAD(&resource_list);
198
199 ret = acpi_dev_get_resources(adev, &resource_list,
200 i2c_acpi_add_resource, &irq);
201 if (ret < 0)
202 return ret;
203
204 acpi_dev_free_resource_list(&resource_list);
205
8466b616
CK		 206 if (irq == -ENOENT)
207 irq = acpi_dev_gpio_irq_get(adev, 0);
208
a52e3b37
CK		 209 return irq;
210}
211
53f8f7c5
WS		 212static int i2c_acpi_get_info(struct acpi_device *adev,
213 struct i2c_board_info *info,
214 struct i2c_adapter *adapter,
215 acpi_handle *adapter_handle)
216{
53f8f7c5
WS		 217 struct i2c_acpi_lookup lookup;
218 int ret;
219
220 memset(&lookup, 0, sizeof(lookup));
221 lookup.info = info;
222 lookup.index = -1;
223
4befedc0
AB		 224 if (acpi_device_enumerated(adev))
225 return -EINVAL;
226
53f8f7c5
WS		 227 ret = i2c_acpi_do_lookup(adev, &lookup);
228 if (ret)
229 return ret;
230
231 if (adapter) {
232 /* The adapter must match the one in I2cSerialBus() connector */
233 if (ACPI_HANDLE(&adapter->dev) != lookup.adapter_handle)
234 return -ENODEV;
235 } else {
236 struct acpi_device *adapter_adev;
237
238 /* The adapter must be present */
239 if (acpi_bus_get_device(lookup.adapter_handle, &adapter_adev))
240 return -ENODEV;
241 if (acpi_bus_get_status(adapter_adev) ||
242 !adapter_adev->status.present)
243 return -ENODEV;
244 }
245
246 info->fwnode = acpi_fwnode_handle(adev);
247 if (adapter_handle)
248 *adapter_handle = lookup.adapter_handle;
249
53f8f7c5
WS		 250 acpi_set_modalias(adev, dev_name(&adev->dev), info->type,
251 sizeof(info->type));
252
253 return 0;
254}
255
256static void i2c_acpi_register_device(struct i2c_adapter *adapter,
257 struct acpi_device *adev,
258 struct i2c_board_info *info)
259{
a6e1445c
HG		 260 /*
261 * Skip registration on boards where the ACPI tables are
262 * known to contain bogus I2C devices.
263 */
264 if (acpi_quirk_skip_i2c_client_enumeration(adev))
265 return;
266
53f8f7c5
WS		 267 adev->power.flags.ignore_parent = true;
268 acpi_device_set_enumerated(adev);
269
785e21cf 270 if (IS_ERR(i2c_new_client_device(adapter, info)))
53f8f7c5 271 adev->power.flags.ignore_parent = false;
53f8f7c5
WS		 272}
273
274static acpi_status i2c_acpi_add_device(acpi_handle handle, u32 level,
275 void *data, void **return_value)
276{
277 struct i2c_adapter *adapter = data;
278 struct acpi_device *adev;
279 struct i2c_board_info info;
280
281 if (acpi_bus_get_device(handle, &adev))
282 return AE_OK;
283
284 if (i2c_acpi_get_info(adev, &info, adapter, NULL))
285 return AE_OK;
286
287 i2c_acpi_register_device(adapter, adev, &info);
288
289 return AE_OK;
290}
291
292#define I2C_ACPI_MAX_SCAN_DEPTH 32
293
294/**
295 * i2c_acpi_register_devices - enumerate I2C slave devices behind adapter
296 * @adap: pointer to adapter
297 *
298 * Enumerate all I2C slave devices behind this adapter by walking the ACPI
299 * namespace. When a device is found it will be added to the Linux device
300 * model and bound to the corresponding ACPI handle.
301 */
302void i2c_acpi_register_devices(struct i2c_adapter *adap)
303{
a9e10e58 304 struct acpi_device *adev;
53f8f7c5
WS		 305 acpi_status status;
306
307 if (!has_acpi_companion(&adap->dev))
308 return;
309
310 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
311 I2C_ACPI_MAX_SCAN_DEPTH,
312 i2c_acpi_add_device, NULL,
313 adap, NULL);
314 if (ACPI_FAILURE(status))
315 dev_warn(&adap->dev, "failed to enumerate I2C slaves\n");
8058d699
HG		 316
317 if (!adap->dev.parent)
318 return;
319
a9e10e58
DS		 320 adev = ACPI_COMPANION(adap->dev.parent);
321 if (!adev)
8058d699
HG		 322 return;
323
a9e10e58 324 acpi_dev_clear_dependencies(adev);
53f8f7c5
WS		 325}
326
7574c0db
HG		 327static const struct acpi_device_id i2c_acpi_force_400khz_device_ids[] = {
328 /*
329 * These Silead touchscreen controllers only work at 400KHz, for
330 * some reason they do not work at 100KHz. On some devices the ACPI
331 * tables list another device at their bus as only being capable
332 * of 100KHz, testing has shown that these other devices work fine
333 * at 400KHz (as can be expected of any recent i2c hw) so we force
334 * the speed of the bus to 400 KHz if a Silead device is present.
335 */
336 { "MSSL1680", 0 },
337 {}
338};
339
53f8f7c5
WS		 340static acpi_status i2c_acpi_lookup_speed(acpi_handle handle, u32 level,
341 void *data, void **return_value)
342{
343 struct i2c_acpi_lookup *lookup = data;
344 struct acpi_device *adev;
345
346 if (acpi_bus_get_device(handle, &adev))
347 return AE_OK;
348
349 if (i2c_acpi_do_lookup(adev, lookup))
350 return AE_OK;
351
352 if (lookup->search_handle != lookup->adapter_handle)
353 return AE_OK;
354
355 if (lookup->speed <= lookup->min_speed)
356 lookup->min_speed = lookup->speed;
357
7574c0db 358 if (acpi_match_device_ids(adev, i2c_acpi_force_400khz_device_ids) == 0)
e6282fc6 359 lookup->force_speed = I2C_MAX_FAST_MODE_FREQ;
7574c0db 360
53f8f7c5
WS		 361 return AE_OK;
362}
363
364/**
365 * i2c_acpi_find_bus_speed - find I2C bus speed from ACPI
366 * @dev: The device owning the bus
367 *
368 * Find the I2C bus speed by walking the ACPI namespace for all I2C slaves
369 * devices connected to this bus and use the speed of slowest device.
370 *
371 * Returns the speed in Hz or zero
372 */
373u32 i2c_acpi_find_bus_speed(struct device *dev)
374{
375 struct i2c_acpi_lookup lookup;
376 struct i2c_board_info dummy;
377 acpi_status status;
378
379 if (!has_acpi_companion(dev))
380 return 0;
381
382 memset(&lookup, 0, sizeof(lookup));
383 lookup.search_handle = ACPI_HANDLE(dev);
384 lookup.min_speed = UINT_MAX;
385 lookup.info = &dummy;
386 lookup.index = -1;
387
388 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
389 I2C_ACPI_MAX_SCAN_DEPTH,
390 i2c_acpi_lookup_speed, NULL,
391 &lookup, NULL);
392
393 if (ACPI_FAILURE(status)) {
394 dev_warn(dev, "unable to find I2C bus speed from ACPI\n");
395 return 0;
396 }
397
7574c0db
HG		 398 if (lookup.force_speed) {
399 if (lookup.force_speed != lookup.min_speed)
400 dev_warn(dev, FW_BUG "DSDT uses known not-working I2C bus speed %d, forcing it to %d\n",
401 lookup.min_speed, lookup.force_speed);
402 return lookup.force_speed;
403 } else if (lookup.min_speed != UINT_MAX) {
404 return lookup.min_speed;
405 } else {
406 return 0;
407 }
53f8f7c5
WS		 408}
409EXPORT_SYMBOL_GPL(i2c_acpi_find_bus_speed);
410
1e91a2e5 411struct i2c_adapter *i2c_acpi_find_adapter_by_handle(acpi_handle handle)
53f8f7c5 412{
0a2d47aa 413 struct i2c_adapter *adapter;
644bf600
SP		 414 struct device *dev;
415
0a2d47aa
AS		 416 dev = bus_find_device(&i2c_bus_type, NULL, handle, device_match_acpi_handle);
417 if (!dev)
418 return NULL;
419
420 adapter = i2c_verify_adapter(dev);
421 if (!adapter)
422 put_device(dev);
53f8f7c5 423
0a2d47aa 424 return adapter;
53f8f7c5 425}
1e91a2e5 426EXPORT_SYMBOL_GPL(i2c_acpi_find_adapter_by_handle);
53f8f7c5
WS		 427
428static struct i2c_client *i2c_acpi_find_client_by_adev(struct acpi_device *adev)
429{
430 struct device *dev;
8daee952 431 struct i2c_client *client;
53f8f7c5 432
00500147 433 dev = bus_find_device_by_acpi_dev(&i2c_bus_type, adev);
8daee952
WS		 434 if (!dev)
435 return NULL;
436
437 client = i2c_verify_client(dev);
438 if (!client)
439 put_device(dev);
440
441 return client;
53f8f7c5
WS		 442}
443
444static int i2c_acpi_notify(struct notifier_block *nb, unsigned long value,
445 void *arg)
446{
447 struct acpi_device *adev = arg;
448 struct i2c_board_info info;
449 acpi_handle adapter_handle;
450 struct i2c_adapter *adapter;
451 struct i2c_client *client;
452
453 switch (value) {
454 case ACPI_RECONFIG_DEVICE_ADD:
455 if (i2c_acpi_get_info(adev, &info, NULL, &adapter_handle))
456 break;
457
458 adapter = i2c_acpi_find_adapter_by_handle(adapter_handle);
459 if (!adapter)
460 break;
461
462 i2c_acpi_register_device(adapter, adev, &info);
6558b646 463 put_device(&adapter->dev);
53f8f7c5
WS		 464 break;
465 case ACPI_RECONFIG_DEVICE_REMOVE:
466 if (!acpi_device_enumerated(adev))
467 break;
468
469 client = i2c_acpi_find_client_by_adev(adev);
470 if (!client)
471 break;
472
473 i2c_unregister_device(client);
474 put_device(&client->dev);
475 break;
476 }
477
478 return NOTIFY_OK;
479}
480
481struct notifier_block i2c_acpi_notifier = {
482 .notifier_call = i2c_acpi_notify,
483};
484
485/**
c537be0b
HG		 486 * i2c_acpi_new_device_by_fwnode - Create i2c-client for the Nth I2cSerialBus resource
487 * @fwnode: fwnode with the ACPI resources to get the client from
53f8f7c5
WS		 488 * @index: Index of ACPI resource to get
489 * @info: describes the I2C device; note this is modified (addr gets set)
490 * Context: can sleep
491 *
492 * By default the i2c subsys creates an i2c-client for the first I2cSerialBus
493 * resource of an acpi_device, but some acpi_devices have multiple I2cSerialBus
494 * resources, in that case this function can be used to create an i2c-client
495 * for other I2cSerialBus resources in the Current Resource Settings table.
496 *
90a3be9b
WS		 497 * Also see i2c_new_client_device, which this function calls to create the
498 * i2c-client.
53f8f7c5 499 *
2dea645f
AS		 500 * Returns a pointer to the new i2c-client, or error pointer in case of failure.
501 * Specifically, -EPROBE_DEFER is returned if the adapter is not found.
53f8f7c5 502 */
c537be0b
HG		 503struct i2c_client *i2c_acpi_new_device_by_fwnode(struct fwnode_handle *fwnode,
504 int index,
505 struct i2c_board_info *info)
53f8f7c5
WS		 506{
507 struct i2c_acpi_lookup lookup;
508 struct i2c_adapter *adapter;
c537be0b 509 struct acpi_device *adev;
53f8f7c5
WS		 510 LIST_HEAD(resource_list);
511 int ret;
512
c537be0b
HG		 513 adev = to_acpi_device_node(fwnode);
514 if (!adev)
515 return ERR_PTR(-ENODEV);
516
53f8f7c5
WS		 517 memset(&lookup, 0, sizeof(lookup));
518 lookup.info = info;
519 lookup.device_handle = acpi_device_handle(adev);
520 lookup.index = index;
521
522 ret = acpi_dev_get_resources(adev, &resource_list,
523 i2c_acpi_fill_info, &lookup);
2dea645f
AS		 524 if (ret < 0)
525 return ERR_PTR(ret);
526
53f8f7c5
WS		 527 acpi_dev_free_resource_list(&resource_list);
528
2dea645f
AS		 529 if (!info->addr)
530 return ERR_PTR(-EADDRNOTAVAIL);
53f8f7c5
WS		 531
532 adapter = i2c_acpi_find_adapter_by_handle(lookup.adapter_handle);
533 if (!adapter)
2dea645f
AS		 534 return ERR_PTR(-EPROBE_DEFER);
535
90a3be9b 536 return i2c_new_client_device(adapter, info);
53f8f7c5 537}
c537be0b 538EXPORT_SYMBOL_GPL(i2c_acpi_new_device_by_fwnode);
53f8f7c5 539
b18c1ad6
SA		 540bool i2c_acpi_waive_d0_probe(struct device *dev)
541{
542 struct i2c_driver *driver = to_i2c_driver(dev->driver);
543 struct acpi_device *adev = ACPI_COMPANION(dev);
544
545 return driver->flags & I2C_DRV_ACPI_WAIVE_D0_PROBE &&
546 adev && adev->power.state_for_enumeration >= adev->power.state;
547}
548EXPORT_SYMBOL_GPL(i2c_acpi_waive_d0_probe);
549
53f8f7c5
WS		 550#ifdef CONFIG_ACPI_I2C_OPREGION
551static int acpi_gsb_i2c_read_bytes(struct i2c_client *client,
552 u8 cmd, u8 *data, u8 data_len)
553{
554
555 struct i2c_msg msgs[2];
556 int ret;
557 u8 *buffer;
558
559 buffer = kzalloc(data_len, GFP_KERNEL);
560 if (!buffer)
561 return AE_NO_MEMORY;
562
563 msgs[0].addr = client->addr;
564 msgs[0].flags = client->flags;
565 msgs[0].len = 1;
566 msgs[0].buf = &cmd;
567
568 msgs[1].addr = client->addr;
569 msgs[1].flags = client->flags | I2C_M_RD;
570 msgs[1].len = data_len;
571 msgs[1].buf = buffer;
572
573 ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
7781edae
HG		 574 if (ret < 0) {
575 /* Getting a NACK is unfortunately normal with some DSTDs */
576 if (ret == -EREMOTEIO)
577 dev_dbg(&client->adapter->dev, "i2c read %d bytes from client@%#x starting at reg %#x failed, error: %d\n",
578 data_len, client->addr, cmd, ret);
579 else
580 dev_err(&client->adapter->dev, "i2c read %d bytes from client@%#x starting at reg %#x failed, error: %d\n",
581 data_len, client->addr, cmd, ret);
0a30446c
HG		 582 /* 2 transfers must have completed successfully */
583 } else if (ret == 2) {
53f8f7c5 584 memcpy(data, buffer, data_len);
0a30446c
HG		 585 ret = 0;
586 } else {
587 ret = -EIO;
7781edae 588 }
53f8f7c5
WS		 589
590 kfree(buffer);
591 return ret;
592}
593
594static int acpi_gsb_i2c_write_bytes(struct i2c_client *client,
595 u8 cmd, u8 *data, u8 data_len)
596{
597
598 struct i2c_msg msgs[1];
599 u8 *buffer;
600 int ret = AE_OK;
601
602 buffer = kzalloc(data_len + 1, GFP_KERNEL);
603 if (!buffer)
604 return AE_NO_MEMORY;
605
606 buffer[0] = cmd;
607 memcpy(buffer + 1, data, data_len);
608
609 msgs[0].addr = client->addr;
610 msgs[0].flags = client->flags;
611 msgs[0].len = data_len + 1;
612 msgs[0].buf = buffer;
613
614 ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
53f8f7c5
WS		 615
616 kfree(buffer);
c463a158
HG		 617
618 if (ret < 0) {
619 dev_err(&client->adapter->dev, "i2c write failed: %d\n", ret);
620 return ret;
621 }
622
623 /* 1 transfer must have completed successfully */
624 return (ret == 1) ? 0 : -EIO;
53f8f7c5
WS		 625}
626
627static acpi_status
628i2c_acpi_space_handler(u32 function, acpi_physical_address command,
629 u32 bits, u64 *value64,
630 void *handler_context, void *region_context)
631{
632 struct gsb_buffer *gsb = (struct gsb_buffer *)value64;
633 struct i2c_acpi_handler_data *data = handler_context;
634 struct acpi_connection_info *info = &data->info;
635 struct acpi_resource_i2c_serialbus *sb;
636 struct i2c_adapter *adapter = data->adapter;
637 struct i2c_client *client;
638 struct acpi_resource *ares;
639 u32 accessor_type = function >> 16;
640 u8 action = function & ACPI_IO_MASK;
641 acpi_status ret;
642 int status;
643
644 ret = acpi_buffer_to_resource(info->connection, info->length, &ares);
645 if (ACPI_FAILURE(ret))
646 return ret;
647
648 client = kzalloc(sizeof(*client), GFP_KERNEL);
649 if (!client) {
650 ret = AE_NO_MEMORY;
651 goto err;
652 }
653
0d5102fe 654 if (!value64 || !i2c_acpi_get_i2c_resource(ares, &sb)) {
53f8f7c5
WS		 655 ret = AE_BAD_PARAMETER;
656 goto err;
657 }
658
659 client->adapter = adapter;
660 client->addr = sb->slave_address;
661
662 if (sb->access_mode == ACPI_I2C_10BIT_MODE)
663 client->flags |= I2C_CLIENT_TEN;
664
665 switch (accessor_type) {
666 case ACPI_GSB_ACCESS_ATTRIB_SEND_RCV:
667 if (action == ACPI_READ) {
668 status = i2c_smbus_read_byte(client);
669 if (status >= 0) {
670 gsb->bdata = status;
671 status = 0;
672 }
673 } else {
674 status = i2c_smbus_write_byte(client, gsb->bdata);
675 }
676 break;
677
678 case ACPI_GSB_ACCESS_ATTRIB_BYTE:
679 if (action == ACPI_READ) {
680 status = i2c_smbus_read_byte_data(client, command);
681 if (status >= 0) {
682 gsb->bdata = status;
683 status = 0;
684 }
685 } else {
686 status = i2c_smbus_write_byte_data(client, command,
687 gsb->bdata);
688 }
689 break;
690
691 case ACPI_GSB_ACCESS_ATTRIB_WORD:
692 if (action == ACPI_READ) {
693 status = i2c_smbus_read_word_data(client, command);
694 if (status >= 0) {
695 gsb->wdata = status;
696 status = 0;
697 }
698 } else {
699 status = i2c_smbus_write_word_data(client, command,
700 gsb->wdata);
701 }
702 break;
703
704 case ACPI_GSB_ACCESS_ATTRIB_BLOCK:
705 if (action == ACPI_READ) {
706 status = i2c_smbus_read_block_data(client, command,
707 gsb->data);
708 if (status >= 0) {
709 gsb->len = status;
710 status = 0;
711 }
712 } else {
713 status = i2c_smbus_write_block_data(client, command,
714 gsb->len, gsb->data);
715 }
716 break;
717
718 case ACPI_GSB_ACCESS_ATTRIB_MULTIBYTE:
719 if (action == ACPI_READ) {
720 status = acpi_gsb_i2c_read_bytes(client, command,
721 gsb->data, info->access_length);
53f8f7c5
WS		 722 } else {
723 status = acpi_gsb_i2c_write_bytes(client, command,
724 gsb->data, info->access_length);
725 }
726 break;
727
728 default:
729 dev_warn(&adapter->dev, "protocol 0x%02x not supported for client 0x%02x\n",
730 accessor_type, client->addr);
731 ret = AE_BAD_PARAMETER;
732 goto err;
733 }
734
735 gsb->status = status;
736
737 err:
738 kfree(client);
739 ACPI_FREE(ares);
740 return ret;
741}
742
743
744int i2c_acpi_install_space_handler(struct i2c_adapter *adapter)
745{
746 acpi_handle handle;
747 struct i2c_acpi_handler_data *data;
748 acpi_status status;
749
750 if (!adapter->dev.parent)
751 return -ENODEV;
752
753 handle = ACPI_HANDLE(adapter->dev.parent);
754
755 if (!handle)
756 return -ENODEV;
757
758 data = kzalloc(sizeof(struct i2c_acpi_handler_data),
759 GFP_KERNEL);
760 if (!data)
761 return -ENOMEM;
762
763 data->adapter = adapter;
764 status = acpi_bus_attach_private_data(handle, (void *)data);
765 if (ACPI_FAILURE(status)) {
766 kfree(data);
767 return -ENOMEM;
768 }
769
770 status = acpi_install_address_space_handler(handle,
771 ACPI_ADR_SPACE_GSBUS,
772 &i2c_acpi_space_handler,
773 NULL,
774 data);
775 if (ACPI_FAILURE(status)) {
776 dev_err(&adapter->dev, "Error installing i2c space handler\n");
777 acpi_bus_detach_private_data(handle);
778 kfree(data);
779 return -ENOMEM;
780 }
781
53f8f7c5
WS		 782 return 0;
783}
784
785void i2c_acpi_remove_space_handler(struct i2c_adapter *adapter)
786{
787 acpi_handle handle;
788 struct i2c_acpi_handler_data *data;
789 acpi_status status;
790
791 if (!adapter->dev.parent)
792 return;
793
794 handle = ACPI_HANDLE(adapter->dev.parent);
795
796 if (!handle)
797 return;
798
799 acpi_remove_address_space_handler(handle,
800 ACPI_ADR_SPACE_GSBUS,
801 &i2c_acpi_space_handler);
802
803 status = acpi_bus_get_private_data(handle, (void **)&data);
804 if (ACPI_SUCCESS(status))
805 kfree(data);
806
807 acpi_bus_detach_private_data(handle);
808}
809#endif /* CONFIG_ACPI_I2C_OPREGION */
Linux 6.x block layer and io_uring tree(s)