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
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 DECLARE_FLEX_ARRAY(u8, data);
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;
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 */
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
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, list: &r, preproc: i2c_acpi_resource_count, preproc_data: &count);
96 if (ret < 0)
97 return ret;
98
99 acpi_dev_free_resource_list(list: &r);
100 return count;
101}
102EXPORT_SYMBOL_GPL(i2c_acpi_client_count);
103
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
111 if (info->addr || !i2c_acpi_get_i2c_resource(ares, &sb))
112 return 1;
113
114 if (lookup->index != -1 && lookup->n++ != lookup->index)
115 return 1;
116
117 status = acpi_get_handle(parent: lookup->device_handle,
118 pathname: sb->resource_source.string_ptr,
119 ret_handle: &lookup->adapter_handle);
120 if (ACPI_FAILURE(status))
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
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
140struct i2c_acpi_irq_context {
141 int irq;
142 bool wake_capable;
143};
144
145static int i2c_acpi_do_lookup(struct acpi_device *adev,
146 struct i2c_acpi_lookup *lookup)
147{
148 struct i2c_board_info *info = lookup->info;
149 struct list_head resource_list;
150 int ret;
151
152 if (acpi_bus_get_status(device: adev))
153 return -EINVAL;
154
155 if (!acpi_dev_ready_for_enumeration(device: adev))
156 return -ENODEV;
157
158 if (acpi_match_device_ids(device: adev, ids: i2c_acpi_ignored_device_ids) == 0)
159 return -ENODEV;
160
161 memset(s: info, c: 0, n: sizeof(*info));
162 lookup->device_handle = acpi_device_handle(adev);
163
164 /* Look up for I2cSerialBus resource */
165 INIT_LIST_HEAD(list: &resource_list);
166 ret = acpi_dev_get_resources(adev, list: &resource_list,
167 preproc: i2c_acpi_fill_info, preproc_data: lookup);
168 acpi_dev_free_resource_list(list: &resource_list);
169
170 if (ret < 0 || !info->addr)
171 return -EINVAL;
172
173 return 0;
174}
175
176static int i2c_acpi_add_irq_resource(struct acpi_resource *ares, void *data)
177{
178 struct i2c_acpi_irq_context *irq_ctx = data;
179 struct resource r;
180
181 if (irq_ctx->irq > 0)
182 return 1;
183
184 if (!acpi_dev_resource_interrupt(ares, index: 0, res: &r))
185 return 1;
186
187 irq_ctx->irq = i2c_dev_irq_from_resources(resources: &r, num_resources: 1);
188 irq_ctx->wake_capable = r.flags & IORESOURCE_IRQ_WAKECAPABLE;
189
190 return 1; /* No need to add resource to the list */
191}
192
193/**
194 * i2c_acpi_get_irq - get device IRQ number from ACPI
195 * @client: Pointer to the I2C client device
196 * @wake_capable: Set to true if the IRQ is wake capable
197 *
198 * Find the IRQ number used by a specific client device.
199 *
200 * Return: The IRQ number or an error code.
201 */
202int i2c_acpi_get_irq(struct i2c_client *client, bool *wake_capable)
203{
204 struct acpi_device *adev = ACPI_COMPANION(&client->dev);
205 struct list_head resource_list;
206 struct i2c_acpi_irq_context irq_ctx = {
207 .irq = -ENOENT,
208 };
209 int ret;
210
211 INIT_LIST_HEAD(list: &resource_list);
212
213 ret = acpi_dev_get_resources(adev, list: &resource_list,
214 preproc: i2c_acpi_add_irq_resource, preproc_data: &irq_ctx);
215 if (ret < 0)
216 return ret;
217
218 acpi_dev_free_resource_list(list: &resource_list);
219
220 if (irq_ctx.irq == -ENOENT)
221 irq_ctx.irq = acpi_dev_gpio_irq_wake_get(adev, index: 0, wake_capable: &irq_ctx.wake_capable);
222
223 if (irq_ctx.irq < 0)
224 return irq_ctx.irq;
225
226 if (wake_capable)
227 *wake_capable = irq_ctx.wake_capable;
228
229 return irq_ctx.irq;
230}
231
232static int i2c_acpi_get_info(struct acpi_device *adev,
233 struct i2c_board_info *info,
234 struct i2c_adapter *adapter,
235 acpi_handle *adapter_handle)
236{
237 struct i2c_acpi_lookup lookup;
238 int ret;
239
240 memset(s: &lookup, c: 0, n: sizeof(lookup));
241 lookup.info = info;
242 lookup.index = -1;
243
244 if (acpi_device_enumerated(adev))
245 return -EINVAL;
246
247 ret = i2c_acpi_do_lookup(adev, lookup: &lookup);
248 if (ret)
249 return ret;
250
251 if (adapter) {
252 /* The adapter must match the one in I2cSerialBus() connector */
253 if (!device_match_acpi_handle(dev: &adapter->dev, handle: lookup.adapter_handle))
254 return -ENODEV;
255 } else {
256 struct acpi_device *adapter_adev;
257
258 /* The adapter must be present */
259 adapter_adev = acpi_fetch_acpi_dev(handle: lookup.adapter_handle);
260 if (!adapter_adev)
261 return -ENODEV;
262 if (acpi_bus_get_status(device: adapter_adev) ||
263 !adapter_adev->status.present)
264 return -ENODEV;
265 }
266
267 info->fwnode = acpi_fwnode_handle(adev);
268 if (adapter_handle)
269 *adapter_handle = lookup.adapter_handle;
270
271 acpi_set_modalias(adev, default_id: dev_name(dev: &adev->dev), modalias: info->type,
272 len: sizeof(info->type));
273
274 return 0;
275}
276
277static void i2c_acpi_register_device(struct i2c_adapter *adapter,
278 struct acpi_device *adev,
279 struct i2c_board_info *info)
280{
281 /*
282 * Skip registration on boards where the ACPI tables are
283 * known to contain bogus I2C devices.
284 */
285 if (acpi_quirk_skip_i2c_client_enumeration(adev))
286 return;
287
288 adev->power.flags.ignore_parent = true;
289 acpi_device_set_enumerated(adev);
290
291 if (IS_ERR(ptr: i2c_new_client_device(adap: adapter, info)))
292 adev->power.flags.ignore_parent = false;
293}
294
295static acpi_status i2c_acpi_add_device(acpi_handle handle, u32 level,
296 void *data, void **return_value)
297{
298 struct i2c_adapter *adapter = data;
299 struct acpi_device *adev = acpi_fetch_acpi_dev(handle);
300 struct i2c_board_info info;
301
302 if (!adev || i2c_acpi_get_info(adev, info: &info, adapter, NULL))
303 return AE_OK;
304
305 i2c_acpi_register_device(adapter, adev, info: &info);
306
307 return AE_OK;
308}
309
310#define I2C_ACPI_MAX_SCAN_DEPTH 32
311
312/**
313 * i2c_acpi_register_devices - enumerate I2C slave devices behind adapter
314 * @adap: pointer to adapter
315 *
316 * Enumerate all I2C slave devices behind this adapter by walking the ACPI
317 * namespace. When a device is found it will be added to the Linux device
318 * model and bound to the corresponding ACPI handle.
319 */
320void i2c_acpi_register_devices(struct i2c_adapter *adap)
321{
322 struct acpi_device *adev;
323 acpi_status status;
324
325 if (!has_acpi_companion(dev: &adap->dev))
326 return;
327
328 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
329 I2C_ACPI_MAX_SCAN_DEPTH,
330 descending_callback: i2c_acpi_add_device, NULL,
331 context: adap, NULL);
332 if (ACPI_FAILURE(status))
333 dev_warn(&adap->dev, "failed to enumerate I2C slaves\n");
334
335 if (!adap->dev.parent)
336 return;
337
338 adev = ACPI_COMPANION(adap->dev.parent);
339 if (!adev)
340 return;
341
342 acpi_dev_clear_dependencies(supplier: adev);
343}
344
345static const struct acpi_device_id i2c_acpi_force_400khz_device_ids[] = {
346 /*
347 * These Silead touchscreen controllers only work at 400KHz, for
348 * some reason they do not work at 100KHz. On some devices the ACPI
349 * tables list another device at their bus as only being capable
350 * of 100KHz, testing has shown that these other devices work fine
351 * at 400KHz (as can be expected of any recent i2c hw) so we force
352 * the speed of the bus to 400 KHz if a Silead device is present.
353 */
354 { "MSSL1680", 0 },
355 {}
356};
357
358static const struct acpi_device_id i2c_acpi_force_100khz_device_ids[] = {
359 /*
360 * When a 400KHz freq is used on this model of ELAN touchpad in Linux,
361 * excessive smoothing (similar to when the touchpad's firmware detects
362 * a noisy signal) is sometimes applied. As some devices' (e.g, Lenovo
363 * V15 G4) ACPI tables specify a 400KHz frequency for this device and
364 * some I2C busses (e.g, Designware I2C) default to a 400KHz freq,
365 * force the speed to 100KHz as a workaround.
366 *
367 * For future investigation: This problem may be related to the default
368 * HCNT/LCNT values given by some busses' drivers, because they are not
369 * specified in the aforementioned devices' ACPI tables, and because
370 * the device works without issues on Windows at what is expected to be
371 * a 400KHz frequency. The root cause of the issue is not known.
372 */
373 { "DLL0945", 0 },
374 { .id: "ELAN06FA", .driver_data: 0 },
375 {}
376};
377
378static acpi_status i2c_acpi_lookup_speed(acpi_handle handle, u32 level,
379 void *data, void **return_value)
380{
381 struct i2c_acpi_lookup *lookup = data;
382 struct acpi_device *adev = acpi_fetch_acpi_dev(handle);
383
384 if (!adev || i2c_acpi_do_lookup(adev, lookup))
385 return AE_OK;
386
387 if (lookup->search_handle != lookup->adapter_handle)
388 return AE_OK;
389
390 if (lookup->speed <= lookup->min_speed)
391 lookup->min_speed = lookup->speed;
392
393 if (acpi_match_device_ids(device: adev, ids: i2c_acpi_force_400khz_device_ids) == 0)
394 lookup->force_speed = I2C_MAX_FAST_MODE_FREQ;
395
396 if (acpi_match_device_ids(device: adev, ids: i2c_acpi_force_100khz_device_ids) == 0)
397 lookup->force_speed = I2C_MAX_STANDARD_MODE_FREQ;
398
399 return AE_OK;
400}
401
402/**
403 * i2c_acpi_find_bus_speed - find I2C bus speed from ACPI
404 * @dev: The device owning the bus
405 *
406 * Find the I2C bus speed by walking the ACPI namespace for all I2C slaves
407 * devices connected to this bus and use the speed of slowest device.
408 *
409 * Returns the speed in Hz or zero
410 */
411u32 i2c_acpi_find_bus_speed(struct device *dev)
412{
413 struct i2c_acpi_lookup lookup;
414 struct i2c_board_info dummy;
415 acpi_status status;
416
417 if (!has_acpi_companion(dev))
418 return 0;
419
420 memset(s: &lookup, c: 0, n: sizeof(lookup));
421 lookup.search_handle = ACPI_HANDLE(dev);
422 lookup.min_speed = UINT_MAX;
423 lookup.info = &dummy;
424 lookup.index = -1;
425
426 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
427 I2C_ACPI_MAX_SCAN_DEPTH,
428 descending_callback: i2c_acpi_lookup_speed, NULL,
429 context: &lookup, NULL);
430
431 if (ACPI_FAILURE(status)) {
432 dev_warn(dev, "unable to find I2C bus speed from ACPI\n");
433 return 0;
434 }
435
436 if (lookup.force_speed) {
437 if (lookup.force_speed != lookup.min_speed)
438 dev_warn(dev, FW_BUG "DSDT uses known not-working I2C bus speed %d, forcing it to %d\n",
439 lookup.min_speed, lookup.force_speed);
440 return lookup.force_speed;
441 } else if (lookup.min_speed != UINT_MAX) {
442 return lookup.min_speed;
443 } else {
444 return 0;
445 }
446}
447EXPORT_SYMBOL_GPL(i2c_acpi_find_bus_speed);
448
449struct i2c_adapter *i2c_acpi_find_adapter_by_handle(acpi_handle handle)
450{
451 struct i2c_adapter *adapter;
452 struct device *dev;
453
454 dev = bus_find_device(bus: &i2c_bus_type, NULL, data: handle, match: device_match_acpi_handle);
455 if (!dev)
456 return NULL;
457
458 adapter = i2c_verify_adapter(dev);
459 if (!adapter)
460 put_device(dev);
461
462 return adapter;
463}
464EXPORT_SYMBOL_GPL(i2c_acpi_find_adapter_by_handle);
465
466static struct i2c_client *i2c_acpi_find_client_by_adev(struct acpi_device *adev)
467{
468 return i2c_find_device_by_fwnode(fwnode: acpi_fwnode_handle(adev));
469}
470
471static struct i2c_adapter *i2c_acpi_find_adapter_by_adev(struct acpi_device *adev)
472{
473 return i2c_find_adapter_by_fwnode(fwnode: acpi_fwnode_handle(adev));
474}
475
476static int i2c_acpi_notify(struct notifier_block *nb, unsigned long value,
477 void *arg)
478{
479 struct acpi_device *adev = arg;
480 struct i2c_board_info info;
481 acpi_handle adapter_handle;
482 struct i2c_adapter *adapter;
483 struct i2c_client *client;
484
485 switch (value) {
486 case ACPI_RECONFIG_DEVICE_ADD:
487 if (i2c_acpi_get_info(adev, info: &info, NULL, adapter_handle: &adapter_handle))
488 break;
489
490 adapter = i2c_acpi_find_adapter_by_handle(adapter_handle);
491 if (!adapter)
492 break;
493
494 i2c_acpi_register_device(adapter, adev, info: &info);
495 put_device(dev: &adapter->dev);
496 break;
497 case ACPI_RECONFIG_DEVICE_REMOVE:
498 if (!acpi_device_enumerated(adev))
499 break;
500
501 client = i2c_acpi_find_client_by_adev(adev);
502 if (client) {
503 i2c_unregister_device(client);
504 put_device(dev: &client->dev);
505 }
506
507 adapter = i2c_acpi_find_adapter_by_adev(adev);
508 if (adapter) {
509 acpi_unbind_one(dev: &adapter->dev);
510 put_device(dev: &adapter->dev);
511 }
512
513 break;
514 }
515
516 return NOTIFY_OK;
517}
518
519struct notifier_block i2c_acpi_notifier = {
520 .notifier_call = i2c_acpi_notify,
521};
522
523/**
524 * i2c_acpi_new_device_by_fwnode - Create i2c-client for the Nth I2cSerialBus resource
525 * @fwnode: fwnode with the ACPI resources to get the client from
526 * @index: Index of ACPI resource to get
527 * @info: describes the I2C device; note this is modified (addr gets set)
528 * Context: can sleep
529 *
530 * By default the i2c subsys creates an i2c-client for the first I2cSerialBus
531 * resource of an acpi_device, but some acpi_devices have multiple I2cSerialBus
532 * resources, in that case this function can be used to create an i2c-client
533 * for other I2cSerialBus resources in the Current Resource Settings table.
534 *
535 * Also see i2c_new_client_device, which this function calls to create the
536 * i2c-client.
537 *
538 * Returns a pointer to the new i2c-client, or error pointer in case of failure.
539 * Specifically, -EPROBE_DEFER is returned if the adapter is not found.
540 */
541struct i2c_client *i2c_acpi_new_device_by_fwnode(struct fwnode_handle *fwnode,
542 int index,
543 struct i2c_board_info *info)
544{
545 struct i2c_acpi_lookup lookup;
546 struct i2c_adapter *adapter;
547 struct acpi_device *adev;
548 LIST_HEAD(resource_list);
549 int ret;
550
551 adev = to_acpi_device_node(fwnode);
552 if (!adev)
553 return ERR_PTR(error: -ENODEV);
554
555 memset(s: &lookup, c: 0, n: sizeof(lookup));
556 lookup.info = info;
557 lookup.device_handle = acpi_device_handle(adev);
558 lookup.index = index;
559
560 ret = acpi_dev_get_resources(adev, list: &resource_list,
561 preproc: i2c_acpi_fill_info, preproc_data: &lookup);
562 if (ret < 0)
563 return ERR_PTR(error: ret);
564
565 acpi_dev_free_resource_list(list: &resource_list);
566
567 if (!info->addr)
568 return ERR_PTR(error: -EADDRNOTAVAIL);
569
570 adapter = i2c_acpi_find_adapter_by_handle(lookup.adapter_handle);
571 if (!adapter)
572 return ERR_PTR(error: -EPROBE_DEFER);
573
574 return i2c_new_client_device(adap: adapter, info);
575}
576EXPORT_SYMBOL_GPL(i2c_acpi_new_device_by_fwnode);
577
578bool i2c_acpi_waive_d0_probe(struct device *dev)
579{
580 struct i2c_driver *driver = to_i2c_driver(dev->driver);
581 struct acpi_device *adev = ACPI_COMPANION(dev);
582
583 return driver->flags & I2C_DRV_ACPI_WAIVE_D0_PROBE &&
584 adev && adev->power.state_for_enumeration >= adev->power.state;
585}
586EXPORT_SYMBOL_GPL(i2c_acpi_waive_d0_probe);
587
588#ifdef CONFIG_ACPI_I2C_OPREGION
589static int acpi_gsb_i2c_read_bytes(struct i2c_client *client,
590 u8 cmd, u8 *data, u8 data_len)
591{
592
593 struct i2c_msg msgs[2];
594 int ret;
595 u8 *buffer;
596
597 buffer = kzalloc(data_len, GFP_KERNEL);
598 if (!buffer)
599 return AE_NO_MEMORY;
600
601 msgs[0].addr = client->addr;
602 msgs[0].flags = client->flags;
603 msgs[0].len = 1;
604 msgs[0].buf = &cmd;
605
606 msgs[1].addr = client->addr;
607 msgs[1].flags = client->flags | I2C_M_RD;
608 msgs[1].len = data_len;
609 msgs[1].buf = buffer;
610
611 ret = i2c_transfer(adap: client->adapter, msgs, ARRAY_SIZE(msgs));
612 if (ret < 0) {
613 /* Getting a NACK is unfortunately normal with some DSTDs */
614 if (ret == -EREMOTEIO)
615 dev_dbg(&client->adapter->dev, "i2c read %d bytes from client@%#x starting at reg %#x failed, error: %d\n",
616 data_len, client->addr, cmd, ret);
617 else
618 dev_err(&client->adapter->dev, "i2c read %d bytes from client@%#x starting at reg %#x failed, error: %d\n",
619 data_len, client->addr, cmd, ret);
620 /* 2 transfers must have completed successfully */
621 } else if (ret == 2) {
622 memcpy(to: data, from: buffer, len: data_len);
623 ret = 0;
624 } else {
625 ret = -EIO;
626 }
627
628 kfree(objp: buffer);
629 return ret;
630}
631
632static int acpi_gsb_i2c_write_bytes(struct i2c_client *client,
633 u8 cmd, u8 *data, u8 data_len)
634{
635
636 struct i2c_msg msgs[1];
637 u8 *buffer;
638 int ret = AE_OK;
639
640 buffer = kzalloc(data_len + 1, GFP_KERNEL);
641 if (!buffer)
642 return AE_NO_MEMORY;
643
644 buffer[0] = cmd;
645 memcpy(to: buffer + 1, from: data, len: data_len);
646
647 msgs[0].addr = client->addr;
648 msgs[0].flags = client->flags;
649 msgs[0].len = data_len + 1;
650 msgs[0].buf = buffer;
651
652 ret = i2c_transfer(adap: client->adapter, msgs, ARRAY_SIZE(msgs));
653
654 kfree(objp: buffer);
655
656 if (ret < 0) {
657 dev_err(&client->adapter->dev, "i2c write failed: %d\n", ret);
658 return ret;
659 }
660
661 /* 1 transfer must have completed successfully */
662 return (ret == 1) ? 0 : -EIO;
663}
664
665static acpi_status
666i2c_acpi_space_handler(u32 function, acpi_physical_address command,
667 u32 bits, u64 *value64,
668 void *handler_context, void *region_context)
669{
670 struct gsb_buffer *gsb = (struct gsb_buffer *)value64;
671 struct i2c_acpi_handler_data *data = handler_context;
672 struct acpi_connection_info *info = &data->info;
673 struct acpi_resource_i2c_serialbus *sb;
674 struct i2c_adapter *adapter = data->adapter;
675 struct i2c_client *client;
676 struct acpi_resource *ares;
677 u32 accessor_type = function >> 16;
678 u8 action = function & ACPI_IO_MASK;
679 acpi_status ret;
680 int status;
681
682 ret = acpi_buffer_to_resource(aml_buffer: info->connection, aml_buffer_length: info->length, resource_ptr: &ares);
683 if (ACPI_FAILURE(ret))
684 return ret;
685
686 client = kzalloc(sizeof(*client), GFP_KERNEL);
687 if (!client) {
688 ret = AE_NO_MEMORY;
689 goto err;
690 }
691
692 if (!value64 || !i2c_acpi_get_i2c_resource(ares, &sb)) {
693 ret = AE_BAD_PARAMETER;
694 goto err;
695 }
696
697 client->adapter = adapter;
698 client->addr = sb->slave_address;
699
700 if (sb->access_mode == ACPI_I2C_10BIT_MODE)
701 client->flags |= I2C_CLIENT_TEN;
702
703 switch (accessor_type) {
704 case ACPI_GSB_ACCESS_ATTRIB_SEND_RCV:
705 if (action == ACPI_READ) {
706 status = i2c_smbus_read_byte(client);
707 if (status >= 0) {
708 gsb->bdata = status;
709 status = 0;
710 }
711 } else {
712 status = i2c_smbus_write_byte(client, value: gsb->bdata);
713 }
714 break;
715
716 case ACPI_GSB_ACCESS_ATTRIB_BYTE:
717 if (action == ACPI_READ) {
718 status = i2c_smbus_read_byte_data(client, command);
719 if (status >= 0) {
720 gsb->bdata = status;
721 status = 0;
722 }
723 } else {
724 status = i2c_smbus_write_byte_data(client, command,
725 value: gsb->bdata);
726 }
727 break;
728
729 case ACPI_GSB_ACCESS_ATTRIB_WORD:
730 if (action == ACPI_READ) {
731 status = i2c_smbus_read_word_data(client, command);
732 if (status >= 0) {
733 gsb->wdata = status;
734 status = 0;
735 }
736 } else {
737 status = i2c_smbus_write_word_data(client, command,
738 value: gsb->wdata);
739 }
740 break;
741
742 case ACPI_GSB_ACCESS_ATTRIB_BLOCK:
743 if (action == ACPI_READ) {
744 status = i2c_smbus_read_block_data(client, command,
745 values: gsb->data);
746 if (status >= 0) {
747 gsb->len = status;
748 status = 0;
749 }
750 } else {
751 status = i2c_smbus_write_block_data(client, command,
752 length: gsb->len, values: gsb->data);
753 }
754 break;
755
756 case ACPI_GSB_ACCESS_ATTRIB_MULTIBYTE:
757 if (action == ACPI_READ) {
758 status = acpi_gsb_i2c_read_bytes(client, cmd: command,
759 data: gsb->data, data_len: info->access_length);
760 } else {
761 status = acpi_gsb_i2c_write_bytes(client, cmd: command,
762 data: gsb->data, data_len: info->access_length);
763 }
764 break;
765
766 default:
767 dev_warn(&adapter->dev, "protocol 0x%02x not supported for client 0x%02x\n",
768 accessor_type, client->addr);
769 ret = AE_BAD_PARAMETER;
770 goto err;
771 }
772
773 gsb->status = status;
774
775 err:
776 kfree(objp: client);
777 ACPI_FREE(ares);
778 return ret;
779}
780
781
782int i2c_acpi_install_space_handler(struct i2c_adapter *adapter)
783{
784 acpi_handle handle;
785 struct i2c_acpi_handler_data *data;
786 acpi_status status;
787
788 if (!adapter->dev.parent)
789 return -ENODEV;
790
791 handle = ACPI_HANDLE(adapter->dev.parent);
792
793 if (!handle)
794 return -ENODEV;
795
796 data = kzalloc(sizeof(struct i2c_acpi_handler_data),
797 GFP_KERNEL);
798 if (!data)
799 return -ENOMEM;
800
801 data->adapter = adapter;
802 status = acpi_bus_attach_private_data(handle, (void *)data);
803 if (ACPI_FAILURE(status)) {
804 kfree(objp: data);
805 return -ENOMEM;
806 }
807
808 status = acpi_install_address_space_handler(device: handle,
809 ACPI_ADR_SPACE_GSBUS,
810 handler: &i2c_acpi_space_handler,
811 NULL,
812 context: data);
813 if (ACPI_FAILURE(status)) {
814 dev_err(&adapter->dev, "Error installing i2c space handler\n");
815 acpi_bus_detach_private_data(handle);
816 kfree(objp: data);
817 return -ENOMEM;
818 }
819
820 return 0;
821}
822
823void i2c_acpi_remove_space_handler(struct i2c_adapter *adapter)
824{
825 acpi_handle handle;
826 struct i2c_acpi_handler_data *data;
827 acpi_status status;
828
829 if (!adapter->dev.parent)
830 return;
831
832 handle = ACPI_HANDLE(adapter->dev.parent);
833
834 if (!handle)
835 return;
836
837 acpi_remove_address_space_handler(device: handle,
838 ACPI_ADR_SPACE_GSBUS,
839 handler: &i2c_acpi_space_handler);
840
841 status = acpi_bus_get_private_data(handle, (void **)&data);
842 if (ACPI_SUCCESS(status))
843 kfree(objp: data);
844
845 acpi_bus_detach_private_data(handle);
846}
847#endif /* CONFIG_ACPI_I2C_OPREGION */
848