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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, &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
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(lookup->device_handle,
118 sb->resource_source.string_ptr,
119 &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(adev))
153 return -EINVAL;
154
155 if (!acpi_dev_ready_for_enumeration(adev))
156 return -ENODEV;
157
158 if (acpi_match_device_ids(adev, i2c_acpi_ignored_device_ids) == 0)
159 return -ENODEV;
160
161 memset(info, 0, sizeof(*info));
162 lookup->device_handle = acpi_device_handle(adev);
163
164 /* Look up for I2cSerialBus resource */
165 INIT_LIST_HEAD(&resource_list);
166 ret = acpi_dev_get_resources(adev, &resource_list,
167 i2c_acpi_fill_info, lookup);
168 acpi_dev_free_resource_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, 0, &r))
185 return 1;
186
187 irq_ctx->irq = i2c_dev_irq_from_resources(&r, 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(&resource_list);
212
213 ret = acpi_dev_get_resources(adev, &resource_list,
214 i2c_acpi_add_irq_resource, &irq_ctx);
215 if (ret < 0)
216 return ret;
217
218 acpi_dev_free_resource_list(&resource_list);
219
220 if (irq_ctx.irq == -ENOENT)
221 irq_ctx.irq = acpi_dev_gpio_irq_wake_get(adev, 0, &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(&lookup, 0, 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);
248 if (ret)
249 return ret;
250
251 if (adapter) {
252 /* The adapter must match the one in I2cSerialBus() connector */
253 if (ACPI_HANDLE(&adapter->dev) != 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(lookup.adapter_handle);
260 if (!adapter_adev)
261 return -ENODEV;
262 if (acpi_bus_get_status(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, dev_name(&adev->dev), info->type,
272 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(i2c_new_client_device(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, adapter, NULL))
303 return AE_OK;
304
305 i2c_acpi_register_device(adapter, adev, &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(&adap->dev))
326 return;
327
328 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
329 I2C_ACPI_MAX_SCAN_DEPTH,
330 i2c_acpi_add_device, NULL,
331 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(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 { "ELAN06FA", 0 },
374 {}
375};
376
377static acpi_status i2c_acpi_lookup_speed(acpi_handle handle, u32 level,
378 void *data, void **return_value)
379{
380 struct i2c_acpi_lookup *lookup = data;
381 struct acpi_device *adev = acpi_fetch_acpi_dev(handle);
382
383 if (!adev || i2c_acpi_do_lookup(adev, lookup))
384 return AE_OK;
385
386 if (lookup->search_handle != lookup->adapter_handle)
387 return AE_OK;
388
389 if (lookup->speed <= lookup->min_speed)
390 lookup->min_speed = lookup->speed;
391
392 if (acpi_match_device_ids(adev, i2c_acpi_force_400khz_device_ids) == 0)
393 lookup->force_speed = I2C_MAX_FAST_MODE_FREQ;
394
395 if (acpi_match_device_ids(adev, i2c_acpi_force_100khz_device_ids) == 0)
396 lookup->force_speed = I2C_MAX_STANDARD_MODE_FREQ;
397
398 return AE_OK;
399}
400
401/**
402 * i2c_acpi_find_bus_speed - find I2C bus speed from ACPI
403 * @dev: The device owning the bus
404 *
405 * Find the I2C bus speed by walking the ACPI namespace for all I2C slaves
406 * devices connected to this bus and use the speed of slowest device.
407 *
408 * Returns the speed in Hz or zero
409 */
410u32 i2c_acpi_find_bus_speed(struct device *dev)
411{
412 struct i2c_acpi_lookup lookup;
413 struct i2c_board_info dummy;
414 acpi_status status;
415
416 if (!has_acpi_companion(dev))
417 return 0;
418
419 memset(&lookup, 0, sizeof(lookup));
420 lookup.search_handle = ACPI_HANDLE(dev);
421 lookup.min_speed = UINT_MAX;
422 lookup.info = &dummy;
423 lookup.index = -1;
424
425 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
426 I2C_ACPI_MAX_SCAN_DEPTH,
427 i2c_acpi_lookup_speed, NULL,
428 &lookup, NULL);
429
430 if (ACPI_FAILURE(status)) {
431 dev_warn(dev, "unable to find I2C bus speed from ACPI\n");
432 return 0;
433 }
434
435 if (lookup.force_speed) {
436 if (lookup.force_speed != lookup.min_speed)
437 dev_warn(dev, FW_BUG "DSDT uses known not-working I2C bus speed %d, forcing it to %d\n",
438 lookup.min_speed, lookup.force_speed);
439 return lookup.force_speed;
440 } else if (lookup.min_speed != UINT_MAX) {
441 return lookup.min_speed;
442 } else {
443 return 0;
444 }
445}
446EXPORT_SYMBOL_GPL(i2c_acpi_find_bus_speed);
447
448struct i2c_adapter *i2c_acpi_find_adapter_by_handle(acpi_handle handle)
449{
450 struct i2c_adapter *adapter;
451 struct device *dev;
452
453 dev = bus_find_device(&i2c_bus_type, NULL, handle, device_match_acpi_handle);
454 if (!dev)
455 return NULL;
456
457 adapter = i2c_verify_adapter(dev);
458 if (!adapter)
459 put_device(dev);
460
461 return adapter;
462}
463EXPORT_SYMBOL_GPL(i2c_acpi_find_adapter_by_handle);
464
465static struct i2c_client *i2c_acpi_find_client_by_adev(struct acpi_device *adev)
466{
467 return i2c_find_device_by_fwnode(acpi_fwnode_handle(adev));
468}
469
470static struct i2c_adapter *i2c_acpi_find_adapter_by_adev(struct acpi_device *adev)
471{
472 return i2c_find_adapter_by_fwnode(acpi_fwnode_handle(adev));
473}
474
475static int i2c_acpi_notify(struct notifier_block *nb, unsigned long value,
476 void *arg)
477{
478 struct acpi_device *adev = arg;
479 struct i2c_board_info info;
480 acpi_handle adapter_handle;
481 struct i2c_adapter *adapter;
482 struct i2c_client *client;
483
484 switch (value) {
485 case ACPI_RECONFIG_DEVICE_ADD:
486 if (i2c_acpi_get_info(adev, &info, NULL, &adapter_handle))
487 break;
488
489 adapter = i2c_acpi_find_adapter_by_handle(adapter_handle);
490 if (!adapter)
491 break;
492
493 i2c_acpi_register_device(adapter, adev, &info);
494 put_device(&adapter->dev);
495 break;
496 case ACPI_RECONFIG_DEVICE_REMOVE:
497 if (!acpi_device_enumerated(adev))
498 break;
499
500 client = i2c_acpi_find_client_by_adev(adev);
501 if (client) {
502 i2c_unregister_device(client);
503 put_device(&client->dev);
504 }
505
506 adapter = i2c_acpi_find_adapter_by_adev(adev);
507 if (adapter) {
508 acpi_unbind_one(&adapter->dev);
509 put_device(&adapter->dev);
510 }
511
512 break;
513 }
514
515 return NOTIFY_OK;
516}
517
518struct notifier_block i2c_acpi_notifier = {
519 .notifier_call = i2c_acpi_notify,
520};
521
522/**
523 * i2c_acpi_new_device_by_fwnode - Create i2c-client for the Nth I2cSerialBus resource
524 * @fwnode: fwnode with the ACPI resources to get the client from
525 * @index: Index of ACPI resource to get
526 * @info: describes the I2C device; note this is modified (addr gets set)
527 * Context: can sleep
528 *
529 * By default the i2c subsys creates an i2c-client for the first I2cSerialBus
530 * resource of an acpi_device, but some acpi_devices have multiple I2cSerialBus
531 * resources, in that case this function can be used to create an i2c-client
532 * for other I2cSerialBus resources in the Current Resource Settings table.
533 *
534 * Also see i2c_new_client_device, which this function calls to create the
535 * i2c-client.
536 *
537 * Returns a pointer to the new i2c-client, or error pointer in case of failure.
538 * Specifically, -EPROBE_DEFER is returned if the adapter is not found.
539 */
540struct i2c_client *i2c_acpi_new_device_by_fwnode(struct fwnode_handle *fwnode,
541 int index,
542 struct i2c_board_info *info)
543{
544 struct i2c_acpi_lookup lookup;
545 struct i2c_adapter *adapter;
546 struct acpi_device *adev;
547 LIST_HEAD(resource_list);
548 int ret;
549
550 adev = to_acpi_device_node(fwnode);
551 if (!adev)
552 return ERR_PTR(-ENODEV);
553
554 memset(&lookup, 0, sizeof(lookup));
555 lookup.info = info;
556 lookup.device_handle = acpi_device_handle(adev);
557 lookup.index = index;
558
559 ret = acpi_dev_get_resources(adev, &resource_list,
560 i2c_acpi_fill_info, &lookup);
561 if (ret < 0)
562 return ERR_PTR(ret);
563
564 acpi_dev_free_resource_list(&resource_list);
565
566 if (!info->addr)
567 return ERR_PTR(-EADDRNOTAVAIL);
568
569 adapter = i2c_acpi_find_adapter_by_handle(lookup.adapter_handle);
570 if (!adapter)
571 return ERR_PTR(-EPROBE_DEFER);
572
573 return i2c_new_client_device(adapter, info);
574}
575EXPORT_SYMBOL_GPL(i2c_acpi_new_device_by_fwnode);
576
577bool i2c_acpi_waive_d0_probe(struct device *dev)
578{
579 struct i2c_driver *driver = to_i2c_driver(dev->driver);
580 struct acpi_device *adev = ACPI_COMPANION(dev);
581
582 return driver->flags & I2C_DRV_ACPI_WAIVE_D0_PROBE &&
583 adev && adev->power.state_for_enumeration >= adev->power.state;
584}
585EXPORT_SYMBOL_GPL(i2c_acpi_waive_d0_probe);
586
587#ifdef CONFIG_ACPI_I2C_OPREGION
588static int acpi_gsb_i2c_read_bytes(struct i2c_client *client,
589 u8 cmd, u8 *data, u8 data_len)
590{
591
592 struct i2c_msg msgs[2];
593 int ret;
594 u8 *buffer;
595
596 buffer = kzalloc(data_len, GFP_KERNEL);
597 if (!buffer)
598 return AE_NO_MEMORY;
599
600 msgs[0].addr = client->addr;
601 msgs[0].flags = client->flags;
602 msgs[0].len = 1;
603 msgs[0].buf = &cmd;
604
605 msgs[1].addr = client->addr;
606 msgs[1].flags = client->flags | I2C_M_RD;
607 msgs[1].len = data_len;
608 msgs[1].buf = buffer;
609
610 ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
611 if (ret < 0) {
612 /* Getting a NACK is unfortunately normal with some DSTDs */
613 if (ret == -EREMOTEIO)
614 dev_dbg(&client->adapter->dev, "i2c read %d bytes from client@%#x starting at reg %#x failed, error: %d\n",
615 data_len, client->addr, cmd, ret);
616 else
617 dev_err(&client->adapter->dev, "i2c read %d bytes from client@%#x starting at reg %#x failed, error: %d\n",
618 data_len, client->addr, cmd, ret);
619 /* 2 transfers must have completed successfully */
620 } else if (ret == 2) {
621 memcpy(data, buffer, data_len);
622 ret = 0;
623 } else {
624 ret = -EIO;
625 }
626
627 kfree(buffer);
628 return ret;
629}
630
631static int acpi_gsb_i2c_write_bytes(struct i2c_client *client,
632 u8 cmd, u8 *data, u8 data_len)
633{
634
635 struct i2c_msg msgs[1];
636 u8 *buffer;
637 int ret = AE_OK;
638
639 buffer = kzalloc(data_len + 1, GFP_KERNEL);
640 if (!buffer)
641 return AE_NO_MEMORY;
642
643 buffer[0] = cmd;
644 memcpy(buffer + 1, data, data_len);
645
646 msgs[0].addr = client->addr;
647 msgs[0].flags = client->flags;
648 msgs[0].len = data_len + 1;
649 msgs[0].buf = buffer;
650
651 ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
652
653 kfree(buffer);
654
655 if (ret < 0) {
656 dev_err(&client->adapter->dev, "i2c write failed: %d\n", ret);
657 return ret;
658 }
659
660 /* 1 transfer must have completed successfully */
661 return (ret == 1) ? 0 : -EIO;
662}
663
664static acpi_status
665i2c_acpi_space_handler(u32 function, acpi_physical_address command,
666 u32 bits, u64 *value64,
667 void *handler_context, void *region_context)
668{
669 struct gsb_buffer *gsb = (struct gsb_buffer *)value64;
670 struct i2c_acpi_handler_data *data = handler_context;
671 struct acpi_connection_info *info = &data->info;
672 struct acpi_resource_i2c_serialbus *sb;
673 struct i2c_adapter *adapter = data->adapter;
674 struct i2c_client *client;
675 struct acpi_resource *ares;
676 u32 accessor_type = function >> 16;
677 u8 action = function & ACPI_IO_MASK;
678 acpi_status ret;
679 int status;
680
681 ret = acpi_buffer_to_resource(info->connection, info->length, &ares);
682 if (ACPI_FAILURE(ret))
683 return ret;
684
685 client = kzalloc(sizeof(*client), GFP_KERNEL);
686 if (!client) {
687 ret = AE_NO_MEMORY;
688 goto err;
689 }
690
691 if (!value64 || !i2c_acpi_get_i2c_resource(ares, &sb)) {
692 ret = AE_BAD_PARAMETER;
693 goto err;
694 }
695
696 client->adapter = adapter;
697 client->addr = sb->slave_address;
698
699 if (sb->access_mode == ACPI_I2C_10BIT_MODE)
700 client->flags |= I2C_CLIENT_TEN;
701
702 switch (accessor_type) {
703 case ACPI_GSB_ACCESS_ATTRIB_SEND_RCV:
704 if (action == ACPI_READ) {
705 status = i2c_smbus_read_byte(client);
706 if (status >= 0) {
707 gsb->bdata = status;
708 status = 0;
709 }
710 } else {
711 status = i2c_smbus_write_byte(client, gsb->bdata);
712 }
713 break;
714
715 case ACPI_GSB_ACCESS_ATTRIB_BYTE:
716 if (action == ACPI_READ) {
717 status = i2c_smbus_read_byte_data(client, command);
718 if (status >= 0) {
719 gsb->bdata = status;
720 status = 0;
721 }
722 } else {
723 status = i2c_smbus_write_byte_data(client, command,
724 gsb->bdata);
725 }
726 break;
727
728 case ACPI_GSB_ACCESS_ATTRIB_WORD:
729 if (action == ACPI_READ) {
730 status = i2c_smbus_read_word_data(client, command);
731 if (status >= 0) {
732 gsb->wdata = status;
733 status = 0;
734 }
735 } else {
736 status = i2c_smbus_write_word_data(client, command,
737 gsb->wdata);
738 }
739 break;
740
741 case ACPI_GSB_ACCESS_ATTRIB_BLOCK:
742 if (action == ACPI_READ) {
743 status = i2c_smbus_read_block_data(client, command,
744 gsb->data);
745 if (status >= 0) {
746 gsb->len = status;
747 status = 0;
748 }
749 } else {
750 status = i2c_smbus_write_block_data(client, command,
751 gsb->len, gsb->data);
752 }
753 break;
754
755 case ACPI_GSB_ACCESS_ATTRIB_MULTIBYTE:
756 if (action == ACPI_READ) {
757 status = acpi_gsb_i2c_read_bytes(client, command,
758 gsb->data, info->access_length);
759 } else {
760 status = acpi_gsb_i2c_write_bytes(client, command,
761 gsb->data, info->access_length);
762 }
763 break;
764
765 default:
766 dev_warn(&adapter->dev, "protocol 0x%02x not supported for client 0x%02x\n",
767 accessor_type, client->addr);
768 ret = AE_BAD_PARAMETER;
769 goto err;
770 }
771
772 gsb->status = status;
773
774 err:
775 kfree(client);
776 ACPI_FREE(ares);
777 return ret;
778}
779
780
781int i2c_acpi_install_space_handler(struct i2c_adapter *adapter)
782{
783 acpi_handle handle;
784 struct i2c_acpi_handler_data *data;
785 acpi_status status;
786
787 if (!adapter->dev.parent)
788 return -ENODEV;
789
790 handle = ACPI_HANDLE(adapter->dev.parent);
791
792 if (!handle)
793 return -ENODEV;
794
795 data = kzalloc(sizeof(struct i2c_acpi_handler_data),
796 GFP_KERNEL);
797 if (!data)
798 return -ENOMEM;
799
800 data->adapter = adapter;
801 status = acpi_bus_attach_private_data(handle, (void *)data);
802 if (ACPI_FAILURE(status)) {
803 kfree(data);
804 return -ENOMEM;
805 }
806
807 status = acpi_install_address_space_handler(handle,
808 ACPI_ADR_SPACE_GSBUS,
809 &i2c_acpi_space_handler,
810 NULL,
811 data);
812 if (ACPI_FAILURE(status)) {
813 dev_err(&adapter->dev, "Error installing i2c space handler\n");
814 acpi_bus_detach_private_data(handle);
815 kfree(data);
816 return -ENOMEM;
817 }
818
819 return 0;
820}
821
822void i2c_acpi_remove_space_handler(struct i2c_adapter *adapter)
823{
824 acpi_handle handle;
825 struct i2c_acpi_handler_data *data;
826 acpi_status status;
827
828 if (!adapter->dev.parent)
829 return;
830
831 handle = ACPI_HANDLE(adapter->dev.parent);
832
833 if (!handle)
834 return;
835
836 acpi_remove_address_space_handler(handle,
837 ACPI_ADR_SPACE_GSBUS,
838 &i2c_acpi_space_handler);
839
840 status = acpi_bus_get_private_data(handle, (void **)&data);
841 if (ACPI_SUCCESS(status))
842 kfree(data);
843
844 acpi_bus_detach_private_data(handle);
845}
846#endif /* CONFIG_ACPI_I2C_OPREGION */