2 * HID over I2C protocol implementation
4 * Copyright (c) 2012 Benjamin Tissoires <benjamin.tissoires@gmail.com>
5 * Copyright (c) 2012 Ecole Nationale de l'Aviation Civile, France
6 * Copyright (c) 2012 Red Hat, Inc
8 * This code is partly based on "USB HID support for Linux":
10 * Copyright (c) 1999 Andreas Gal
11 * Copyright (c) 2000-2005 Vojtech Pavlik <vojtech@suse.cz>
12 * Copyright (c) 2005 Michael Haboustak <mike-@cinci.rr.com> for Concept2, Inc
13 * Copyright (c) 2007-2008 Oliver Neukum
14 * Copyright (c) 2006-2010 Jiri Kosina
16 * This file is subject to the terms and conditions of the GNU General Public
17 * License. See the file COPYING in the main directory of this archive for
21 #include <linux/module.h>
22 #include <linux/i2c.h>
23 #include <linux/interrupt.h>
24 #include <linux/input.h>
25 #include <linux/delay.h>
26 #include <linux/slab.h>
28 #include <linux/device.h>
29 #include <linux/wait.h>
30 #include <linux/err.h>
31 #include <linux/string.h>
32 #include <linux/list.h>
33 #include <linux/jiffies.h>
34 #include <linux/kernel.h>
35 #include <linux/hid.h>
37 #include <linux/i2c/i2c-hid.h>
40 #define I2C_HID_STARTED (1 << 0)
41 #define I2C_HID_RESET_PENDING (1 << 1)
42 #define I2C_HID_READ_PENDING (1 << 2)
44 #define I2C_HID_PWR_ON 0x00
45 #define I2C_HID_PWR_SLEEP 0x01
49 module_param(debug, bool, 0444);
50 MODULE_PARM_DESC(debug, "print a lot of debug information");
52 #define i2c_hid_dbg(ihid, fmt, arg...) \
55 dev_printk(KERN_DEBUG, &(ihid)->client->dev, fmt, ##arg); \
59 __le16 wHIDDescLength;
61 __le16 wReportDescLength;
62 __le16 wReportDescRegister;
63 __le16 wInputRegister;
64 __le16 wMaxInputLength;
65 __le16 wOutputRegister;
66 __le16 wMaxOutputLength;
67 __le16 wCommandRegister;
75 unsigned int registerIndex;
90 #define I2C_HID_CMD(opcode_) \
91 .opcode = opcode_, .length = 4, \
92 .registerIndex = offsetof(struct i2c_hid_desc, wCommandRegister)
94 /* fetch HID descriptor */
95 static const struct i2c_hid_cmd hid_descr_cmd = { .length = 2 };
96 /* fetch report descriptors */
97 static const struct i2c_hid_cmd hid_report_descr_cmd = {
98 .registerIndex = offsetof(struct i2c_hid_desc,
103 static const struct i2c_hid_cmd hid_reset_cmd = { I2C_HID_CMD(0x01),
105 static const struct i2c_hid_cmd hid_get_report_cmd = { I2C_HID_CMD(0x02) };
106 static const struct i2c_hid_cmd hid_set_report_cmd = { I2C_HID_CMD(0x03) };
107 static const struct i2c_hid_cmd hid_set_power_cmd = { I2C_HID_CMD(0x08) };
110 * These definitions are not used here, but are defined by the spec.
111 * Keeping them here for documentation purposes.
113 * static const struct i2c_hid_cmd hid_get_idle_cmd = { I2C_HID_CMD(0x04) };
114 * static const struct i2c_hid_cmd hid_set_idle_cmd = { I2C_HID_CMD(0x05) };
115 * static const struct i2c_hid_cmd hid_get_protocol_cmd = { I2C_HID_CMD(0x06) };
116 * static const struct i2c_hid_cmd hid_set_protocol_cmd = { I2C_HID_CMD(0x07) };
119 /* The main device structure */
121 struct i2c_client *client; /* i2c client */
122 struct hid_device *hid; /* pointer to corresponding HID dev */
124 __u8 hdesc_buffer[sizeof(struct i2c_hid_desc)];
125 struct i2c_hid_desc hdesc; /* the HID Descriptor */
127 __le16 wHIDDescRegister; /* location of the i2c
128 * register of the HID
130 unsigned int bufsize; /* i2c buffer size */
131 char *inbuf; /* Input buffer */
132 char *cmdbuf; /* Command buffer */
133 char *argsbuf; /* Command arguments buffer */
135 unsigned long flags; /* device flags */
137 int irq; /* the interrupt line irq */
139 wait_queue_head_t wait; /* For waiting the interrupt */
142 static int __i2c_hid_command(struct i2c_client *client,
143 const struct i2c_hid_cmd *command, u8 reportID,
144 u8 reportType, u8 *args, int args_len,
145 unsigned char *buf_recv, int data_len)
147 struct i2c_hid *ihid = i2c_get_clientdata(client);
148 union command *cmd = (union command *)ihid->cmdbuf;
150 struct i2c_msg msg[2];
153 int length = command->length;
154 bool wait = command->wait;
155 unsigned int registerIndex = command->registerIndex;
157 /* special case for hid_descr_cmd */
158 if (command == &hid_descr_cmd) {
159 cmd->c.reg = ihid->wHIDDescRegister;
161 cmd->data[0] = ihid->hdesc_buffer[registerIndex];
162 cmd->data[1] = ihid->hdesc_buffer[registerIndex + 1];
166 cmd->c.opcode = command->opcode;
167 cmd->c.reportTypeID = reportID | reportType << 4;
170 memcpy(cmd->data + length, args, args_len);
173 i2c_hid_dbg(ihid, "%s: cmd=%*ph\n", __func__, length, cmd->data);
175 msg[0].addr = client->addr;
176 msg[0].flags = client->flags & I2C_M_TEN;
178 msg[0].buf = cmd->data;
180 msg[1].addr = client->addr;
181 msg[1].flags = client->flags & I2C_M_TEN;
182 msg[1].flags |= I2C_M_RD;
183 msg[1].len = data_len;
184 msg[1].buf = buf_recv;
186 set_bit(I2C_HID_READ_PENDING, &ihid->flags);
190 set_bit(I2C_HID_RESET_PENDING, &ihid->flags);
192 ret = i2c_transfer(client->adapter, msg, msg_num);
195 clear_bit(I2C_HID_READ_PENDING, &ihid->flags);
198 return ret < 0 ? ret : -EIO;
203 i2c_hid_dbg(ihid, "%s: waiting...\n", __func__);
204 if (!wait_event_timeout(ihid->wait,
205 !test_bit(I2C_HID_RESET_PENDING, &ihid->flags),
206 msecs_to_jiffies(5000)))
208 i2c_hid_dbg(ihid, "%s: finished.\n", __func__);
214 static int i2c_hid_command(struct i2c_client *client,
215 const struct i2c_hid_cmd *command,
216 unsigned char *buf_recv, int data_len)
218 return __i2c_hid_command(client, command, 0, 0, NULL, 0,
222 static int i2c_hid_get_report(struct i2c_client *client, u8 reportType,
223 u8 reportID, unsigned char *buf_recv, int data_len)
225 struct i2c_hid *ihid = i2c_get_clientdata(client);
229 u16 readRegister = le16_to_cpu(ihid->hdesc.wDataRegister);
231 i2c_hid_dbg(ihid, "%s\n", __func__);
233 if (reportID >= 0x0F) {
234 args[args_len++] = reportID;
238 args[args_len++] = readRegister & 0xFF;
239 args[args_len++] = readRegister >> 8;
241 ret = __i2c_hid_command(client, &hid_get_report_cmd, reportID,
242 reportType, args, args_len, buf_recv, data_len);
244 dev_err(&client->dev,
245 "failed to retrieve report from device.\n");
252 static int i2c_hid_set_report(struct i2c_client *client, u8 reportType,
253 u8 reportID, unsigned char *buf, size_t data_len)
255 struct i2c_hid *ihid = i2c_get_clientdata(client);
256 u8 *args = ihid->argsbuf;
258 u16 dataRegister = le16_to_cpu(ihid->hdesc.wDataRegister);
260 /* hidraw already checked that data_len < HID_MAX_BUFFER_SIZE */
261 u16 size = 2 /* size */ +
262 (reportID ? 1 : 0) /* reportID */ +
264 int args_len = (reportID >= 0x0F ? 1 : 0) /* optional third byte */ +
265 2 /* dataRegister */ +
269 i2c_hid_dbg(ihid, "%s\n", __func__);
271 if (reportID >= 0x0F) {
272 args[index++] = reportID;
276 args[index++] = dataRegister & 0xFF;
277 args[index++] = dataRegister >> 8;
279 args[index++] = size & 0xFF;
280 args[index++] = size >> 8;
283 args[index++] = reportID;
285 memcpy(&args[index], buf, data_len);
287 ret = __i2c_hid_command(client, &hid_set_report_cmd, reportID,
288 reportType, args, args_len, NULL, 0);
290 dev_err(&client->dev, "failed to set a report to device.\n");
297 static int i2c_hid_set_power(struct i2c_client *client, int power_state)
299 struct i2c_hid *ihid = i2c_get_clientdata(client);
302 i2c_hid_dbg(ihid, "%s\n", __func__);
304 ret = __i2c_hid_command(client, &hid_set_power_cmd, power_state,
305 0, NULL, 0, NULL, 0);
307 dev_err(&client->dev, "failed to change power setting.\n");
312 static int i2c_hid_hwreset(struct i2c_client *client)
314 struct i2c_hid *ihid = i2c_get_clientdata(client);
317 i2c_hid_dbg(ihid, "%s\n", __func__);
319 ret = i2c_hid_set_power(client, I2C_HID_PWR_ON);
323 i2c_hid_dbg(ihid, "resetting...\n");
325 ret = i2c_hid_command(client, &hid_reset_cmd, NULL, 0);
327 dev_err(&client->dev, "failed to reset device.\n");
328 i2c_hid_set_power(client, I2C_HID_PWR_SLEEP);
335 static void i2c_hid_get_input(struct i2c_hid *ihid)
338 int size = le16_to_cpu(ihid->hdesc.wMaxInputLength);
340 ret = i2c_master_recv(ihid->client, ihid->inbuf, size);
345 dev_err(&ihid->client->dev, "%s: got %d data instead of %d\n",
346 __func__, ret, size);
350 ret_size = ihid->inbuf[0] | ihid->inbuf[1] << 8;
353 /* host or device initiated RESET completed */
354 if (test_and_clear_bit(I2C_HID_RESET_PENDING, &ihid->flags))
355 wake_up(&ihid->wait);
359 if (ret_size > size) {
360 dev_err(&ihid->client->dev, "%s: incomplete report (%d/%d)\n",
361 __func__, size, ret_size);
365 i2c_hid_dbg(ihid, "input: %*ph\n", ret_size, ihid->inbuf);
367 if (test_bit(I2C_HID_STARTED, &ihid->flags))
368 hid_input_report(ihid->hid, HID_INPUT_REPORT, ihid->inbuf + 2,
374 static irqreturn_t i2c_hid_irq(int irq, void *dev_id)
376 struct i2c_hid *ihid = dev_id;
378 if (test_bit(I2C_HID_READ_PENDING, &ihid->flags))
381 i2c_hid_get_input(ihid);
386 static int i2c_hid_get_report_length(struct hid_report *report)
388 return ((report->size - 1) >> 3) + 1 +
389 report->device->report_enum[report->type].numbered + 2;
392 static void i2c_hid_init_report(struct hid_report *report, u8 *buffer,
395 struct hid_device *hid = report->device;
396 struct i2c_client *client = hid->driver_data;
397 struct i2c_hid *ihid = i2c_get_clientdata(client);
398 unsigned int size, ret_size;
400 size = i2c_hid_get_report_length(report);
401 if (i2c_hid_get_report(client,
402 report->type == HID_FEATURE_REPORT ? 0x03 : 0x01,
403 report->id, buffer, size))
406 i2c_hid_dbg(ihid, "report (len=%d): %*ph\n", size, size, ihid->inbuf);
408 ret_size = buffer[0] | (buffer[1] << 8);
410 if (ret_size != size) {
411 dev_err(&client->dev, "error in %s size:%d / ret_size:%d\n",
412 __func__, size, ret_size);
416 /* hid->driver_lock is held as we are in probe function,
417 * we just need to setup the input fields, so using
418 * hid_report_raw_event is safe. */
419 hid_report_raw_event(hid, report->type, buffer + 2, size - 2, 1);
423 * Initialize all reports
425 static void i2c_hid_init_reports(struct hid_device *hid)
427 struct hid_report *report;
428 struct i2c_client *client = hid->driver_data;
429 struct i2c_hid *ihid = i2c_get_clientdata(client);
430 u8 *inbuf = kzalloc(ihid->bufsize, GFP_KERNEL);
433 dev_err(&client->dev, "can not retrieve initial reports\n");
437 list_for_each_entry(report,
438 &hid->report_enum[HID_INPUT_REPORT].report_list, list)
439 i2c_hid_init_report(report, inbuf, ihid->bufsize);
441 list_for_each_entry(report,
442 &hid->report_enum[HID_FEATURE_REPORT].report_list, list)
443 i2c_hid_init_report(report, inbuf, ihid->bufsize);
449 * Traverse the supplied list of reports and find the longest
451 static void i2c_hid_find_max_report(struct hid_device *hid, unsigned int type,
454 struct hid_report *report;
457 /* We should not rely on wMaxInputLength, as some devices may set it to
459 list_for_each_entry(report, &hid->report_enum[type].report_list, list) {
460 size = i2c_hid_get_report_length(report);
466 static int i2c_hid_alloc_buffers(struct i2c_hid *ihid)
468 /* the worst case is computed from the set_report command with a
469 * reportID > 15 and the maximum report length */
470 int args_len = sizeof(__u8) + /* optional ReportID byte */
471 sizeof(__u16) + /* data register */
472 sizeof(__u16) + /* size of the report */
473 ihid->bufsize; /* report */
475 ihid->inbuf = kzalloc(ihid->bufsize, GFP_KERNEL);
480 ihid->argsbuf = kzalloc(args_len, GFP_KERNEL);
482 if (!ihid->argsbuf) {
487 ihid->cmdbuf = kzalloc(sizeof(union command) + args_len, GFP_KERNEL);
491 kfree(ihid->argsbuf);
493 ihid->argsbuf = NULL;
500 static void i2c_hid_free_buffers(struct i2c_hid *ihid)
503 kfree(ihid->argsbuf);
507 ihid->argsbuf = NULL;
510 static int i2c_hid_get_raw_report(struct hid_device *hid,
511 unsigned char report_number, __u8 *buf, size_t count,
512 unsigned char report_type)
514 struct i2c_client *client = hid->driver_data;
515 struct i2c_hid *ihid = i2c_get_clientdata(client);
518 if (report_type == HID_OUTPUT_REPORT)
521 if (count > ihid->bufsize)
522 count = ihid->bufsize;
524 ret = i2c_hid_get_report(client,
525 report_type == HID_FEATURE_REPORT ? 0x03 : 0x01,
526 report_number, ihid->inbuf, count);
531 count = ihid->inbuf[0] | (ihid->inbuf[1] << 8);
533 memcpy(buf, ihid->inbuf + 2, count);
538 static int i2c_hid_output_raw_report(struct hid_device *hid, __u8 *buf,
539 size_t count, unsigned char report_type)
541 struct i2c_client *client = hid->driver_data;
542 int report_id = buf[0];
544 if (report_type == HID_INPUT_REPORT)
547 return i2c_hid_set_report(client,
548 report_type == HID_FEATURE_REPORT ? 0x03 : 0x02,
549 report_id, buf, count);
552 static int i2c_hid_parse(struct hid_device *hid)
554 struct i2c_client *client = hid->driver_data;
555 struct i2c_hid *ihid = i2c_get_clientdata(client);
556 struct i2c_hid_desc *hdesc = &ihid->hdesc;
562 i2c_hid_dbg(ihid, "entering %s\n", __func__);
564 rsize = le16_to_cpu(hdesc->wReportDescLength);
565 if (!rsize || rsize > HID_MAX_DESCRIPTOR_SIZE) {
566 dbg_hid("weird size of report descriptor (%u)\n", rsize);
571 ret = i2c_hid_hwreset(client);
574 } while (tries-- > 0 && ret);
579 rdesc = kzalloc(rsize, GFP_KERNEL);
582 dbg_hid("couldn't allocate rdesc memory\n");
586 i2c_hid_dbg(ihid, "asking HID report descriptor\n");
588 ret = i2c_hid_command(client, &hid_report_descr_cmd, rdesc, rsize);
590 hid_err(hid, "reading report descriptor failed\n");
595 i2c_hid_dbg(ihid, "Report Descriptor: %*ph\n", rsize, rdesc);
597 ret = hid_parse_report(hid, rdesc, rsize);
600 dbg_hid("parsing report descriptor failed\n");
607 static int i2c_hid_start(struct hid_device *hid)
609 struct i2c_client *client = hid->driver_data;
610 struct i2c_hid *ihid = i2c_get_clientdata(client);
612 int old_bufsize = ihid->bufsize;
614 ihid->bufsize = HID_MIN_BUFFER_SIZE;
615 i2c_hid_find_max_report(hid, HID_INPUT_REPORT, &ihid->bufsize);
616 i2c_hid_find_max_report(hid, HID_OUTPUT_REPORT, &ihid->bufsize);
617 i2c_hid_find_max_report(hid, HID_FEATURE_REPORT, &ihid->bufsize);
619 if (ihid->bufsize > old_bufsize || !ihid->inbuf || !ihid->cmdbuf) {
620 i2c_hid_free_buffers(ihid);
622 ret = i2c_hid_alloc_buffers(ihid);
625 ihid->bufsize = old_bufsize;
630 if (!(hid->quirks & HID_QUIRK_NO_INIT_REPORTS))
631 i2c_hid_init_reports(hid);
636 static void i2c_hid_stop(struct hid_device *hid)
638 struct i2c_client *client = hid->driver_data;
639 struct i2c_hid *ihid = i2c_get_clientdata(client);
643 i2c_hid_free_buffers(ihid);
646 static int i2c_hid_open(struct hid_device *hid)
648 struct i2c_client *client = hid->driver_data;
649 struct i2c_hid *ihid = i2c_get_clientdata(client);
653 ret = i2c_hid_set_power(client, I2C_HID_PWR_ON);
658 set_bit(I2C_HID_STARTED, &ihid->flags);
663 static void i2c_hid_close(struct hid_device *hid)
665 struct i2c_client *client = hid->driver_data;
666 struct i2c_hid *ihid = i2c_get_clientdata(client);
668 /* protecting hid->open to make sure we don't restart
669 * data acquistion due to a resumption we no longer
673 clear_bit(I2C_HID_STARTED, &ihid->flags);
675 /* Save some power */
676 i2c_hid_set_power(client, I2C_HID_PWR_SLEEP);
680 static int i2c_hid_power(struct hid_device *hid, int lvl)
682 struct i2c_client *client = hid->driver_data;
683 struct i2c_hid *ihid = i2c_get_clientdata(client);
686 i2c_hid_dbg(ihid, "%s lvl:%d\n", __func__, lvl);
690 ret = i2c_hid_set_power(client, I2C_HID_PWR_ON);
693 ret = i2c_hid_set_power(client, I2C_HID_PWR_SLEEP);
699 static int i2c_hid_hidinput_input_event(struct input_dev *dev,
700 unsigned int type, unsigned int code, int value)
702 struct hid_device *hid = input_get_drvdata(dev);
703 struct hid_field *field;
707 return input_ff_event(dev, type, code, value);
712 offset = hidinput_find_field(hid, type, code, &field);
715 hid_warn(dev, "event field not found\n");
719 return hid_set_field(field, offset, value);
722 static struct hid_ll_driver i2c_hid_ll_driver = {
723 .parse = i2c_hid_parse,
724 .start = i2c_hid_start,
725 .stop = i2c_hid_stop,
726 .open = i2c_hid_open,
727 .close = i2c_hid_close,
728 .power = i2c_hid_power,
729 .hidinput_input_event = i2c_hid_hidinput_input_event,
732 static int __devinit i2c_hid_init_irq(struct i2c_client *client)
734 struct i2c_hid *ihid = i2c_get_clientdata(client);
737 dev_dbg(&client->dev, "Requesting IRQ: %d\n", client->irq);
739 ret = request_threaded_irq(client->irq, NULL, i2c_hid_irq,
740 IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
743 dev_warn(&client->dev,
744 "Could not register for %s interrupt, irq = %d,"
746 client->name, client->irq, ret);
751 ihid->irq = client->irq;
756 static int __devinit i2c_hid_fetch_hid_descriptor(struct i2c_hid *ihid)
758 struct i2c_client *client = ihid->client;
759 struct i2c_hid_desc *hdesc = &ihid->hdesc;
763 /* Fetch the length of HID description, retrieve the 4 first bytes:
764 * bytes 0-1 -> length
765 * bytes 2-3 -> bcdVersion (has to be 1.00) */
766 ret = i2c_hid_command(client, &hid_descr_cmd, ihid->hdesc_buffer, 4);
768 i2c_hid_dbg(ihid, "%s, ihid->hdesc_buffer: %*ph\n",
769 __func__, 4, ihid->hdesc_buffer);
772 dev_err(&client->dev,
773 "unable to fetch the size of HID descriptor (ret=%d)\n",
778 dsize = le16_to_cpu(hdesc->wHIDDescLength);
779 if (!dsize || dsize > HID_MAX_DESCRIPTOR_SIZE) {
780 dev_err(&client->dev, "weird size of HID descriptor (%u)\n",
785 /* check bcdVersion == 1.0 */
786 if (le16_to_cpu(hdesc->bcdVersion) != 0x0100) {
787 dev_err(&client->dev,
788 "unexpected HID descriptor bcdVersion (0x%04hx)\n",
789 le16_to_cpu(hdesc->bcdVersion));
793 i2c_hid_dbg(ihid, "Fetching the HID descriptor\n");
795 ret = i2c_hid_command(client, &hid_descr_cmd, ihid->hdesc_buffer,
798 dev_err(&client->dev, "hid_descr_cmd Fail\n");
802 i2c_hid_dbg(ihid, "HID Descriptor: %*ph\n", dsize, ihid->hdesc_buffer);
807 static int __devinit i2c_hid_probe(struct i2c_client *client,
808 const struct i2c_device_id *dev_id)
811 struct i2c_hid *ihid;
812 struct hid_device *hid;
814 struct i2c_hid_platform_data *platform_data = client->dev.platform_data;
816 dbg_hid("HID probe called for i2c 0x%02x\n", client->addr);
818 if (!platform_data) {
819 dev_err(&client->dev, "HID register address not provided\n");
824 dev_err(&client->dev,
825 "HID over i2c has not been provided an Int IRQ\n");
829 ihid = kzalloc(sizeof(struct i2c_hid), GFP_KERNEL);
833 i2c_set_clientdata(client, ihid);
835 ihid->client = client;
837 hidRegister = platform_data->hid_descriptor_address;
838 ihid->wHIDDescRegister = cpu_to_le16(hidRegister);
840 init_waitqueue_head(&ihid->wait);
842 /* we need to allocate the command buffer without knowing the maximum
843 * size of the reports. Let's use HID_MIN_BUFFER_SIZE, then we do the
844 * real computation later. */
845 ihid->bufsize = HID_MIN_BUFFER_SIZE;
846 i2c_hid_alloc_buffers(ihid);
848 ret = i2c_hid_fetch_hid_descriptor(ihid);
852 ret = i2c_hid_init_irq(client);
856 hid = hid_allocate_device();
864 hid->driver_data = client;
865 hid->ll_driver = &i2c_hid_ll_driver;
866 hid->hid_get_raw_report = i2c_hid_get_raw_report;
867 hid->hid_output_raw_report = i2c_hid_output_raw_report;
868 hid->dev.parent = &client->dev;
870 hid->version = le16_to_cpu(ihid->hdesc.bcdVersion);
871 hid->vendor = le16_to_cpu(ihid->hdesc.wVendorID);
872 hid->product = le16_to_cpu(ihid->hdesc.wProductID);
874 snprintf(hid->name, sizeof(hid->name), "%s %04hX:%04hX",
875 client->name, hid->vendor, hid->product);
877 ret = hid_add_device(hid);
880 hid_err(client, "can't add hid device: %d\n", ret);
887 hid_destroy_device(hid);
891 free_irq(ihid->irq, ihid);
893 i2c_hid_free_buffers(ihid);
898 static int __devexit i2c_hid_remove(struct i2c_client *client)
900 struct i2c_hid *ihid = i2c_get_clientdata(client);
901 struct hid_device *hid;
904 hid_destroy_device(hid);
906 free_irq(client->irq, ihid);
909 i2c_hid_free_buffers(ihid);
916 #ifdef CONFIG_PM_SLEEP
917 static int i2c_hid_suspend(struct device *dev)
919 struct i2c_client *client = to_i2c_client(dev);
920 struct i2c_hid *ihid = i2c_get_clientdata(client);
922 if (device_may_wakeup(&client->dev))
923 enable_irq_wake(ihid->irq);
925 /* Save some power */
926 i2c_hid_set_power(client, I2C_HID_PWR_SLEEP);
931 static int i2c_hid_resume(struct device *dev)
934 struct i2c_client *client = to_i2c_client(dev);
936 ret = i2c_hid_hwreset(client);
940 if (device_may_wakeup(&client->dev))
941 disable_irq_wake(client->irq);
947 static SIMPLE_DEV_PM_OPS(i2c_hid_pm, i2c_hid_suspend, i2c_hid_resume);
949 static const struct i2c_device_id i2c_hid_id_table[] = {
953 MODULE_DEVICE_TABLE(i2c, i2c_hid_id_table);
956 static struct i2c_driver i2c_hid_driver = {
959 .owner = THIS_MODULE,
963 .probe = i2c_hid_probe,
964 .remove = __devexit_p(i2c_hid_remove),
966 .id_table = i2c_hid_id_table,
969 module_i2c_driver(i2c_hid_driver);
971 MODULE_DESCRIPTION("HID over I2C core driver");
972 MODULE_AUTHOR("Benjamin Tissoires <benjamin.tissoires@gmail.com>");
973 MODULE_LICENSE("GPL");