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/bug.h>
36 #include <linux/hid.h>
38 #include <linux/i2c/i2c-hid.h>
41 #define I2C_HID_STARTED (1 << 0)
42 #define I2C_HID_RESET_PENDING (1 << 1)
43 #define I2C_HID_READ_PENDING (1 << 2)
45 #define I2C_HID_PWR_ON 0x00
46 #define I2C_HID_PWR_SLEEP 0x01
49 static bool debug = false;
50 module_param(debug, bool, 0444);
51 MODULE_PARM_DESC(debug, "print a lot of debug information");
53 #define i2c_hid_dbg(ihid, fmt, arg...) \
55 dev_printk(KERN_DEBUG, &(ihid)->client->dev, fmt, ##arg)
58 __le16 wHIDDescLength;
60 __le16 wReportDescLength;
61 __le16 wReportDescRegister;
62 __le16 wInputRegister;
63 __le16 wMaxInputLength;
64 __le16 wOutputRegister;
65 __le16 wMaxOutputLength;
66 __le16 wCommandRegister;
74 unsigned int registerIndex;
89 #define I2C_HID_CMD(opcode_) \
90 .opcode = opcode_, .length = 4, \
91 .registerIndex = offsetof(struct i2c_hid_desc, wCommandRegister)
93 /* fetch HID descriptor */
94 static const struct i2c_hid_cmd hid_descr_cmd = { .length = 2 };
95 /* fetch report descriptors */
96 static const struct i2c_hid_cmd hid_report_descr_cmd = {
97 .registerIndex = offsetof(struct i2c_hid_desc,
102 static const struct i2c_hid_cmd hid_reset_cmd = { I2C_HID_CMD(0x01),
104 static const struct i2c_hid_cmd hid_get_report_cmd = { I2C_HID_CMD(0x02) };
105 static const struct i2c_hid_cmd hid_set_report_cmd = { I2C_HID_CMD(0x03) };
106 static const struct i2c_hid_cmd hid_get_idle_cmd = { I2C_HID_CMD(0x04) };
107 static const struct i2c_hid_cmd hid_set_idle_cmd = { I2C_HID_CMD(0x05) };
108 static const struct i2c_hid_cmd hid_get_protocol_cmd = { I2C_HID_CMD(0x06) };
109 static const struct i2c_hid_cmd hid_set_protocol_cmd = { I2C_HID_CMD(0x07) };
110 static const struct i2c_hid_cmd hid_set_power_cmd = { I2C_HID_CMD(0x08) };
111 /* read/write data register */
112 static const struct i2c_hid_cmd hid_data_cmd = {
113 .registerIndex = offsetof(struct i2c_hid_desc, wDataRegister),
116 /* write output reports */
117 static const struct i2c_hid_cmd hid_out_cmd = {
118 .registerIndex = offsetof(struct i2c_hid_desc,
123 /* The main device structure */
125 struct i2c_client *client; /* i2c client */
126 struct hid_device *hid; /* pointer to corresponding HID dev */
128 __u8 hdesc_buffer[sizeof(struct i2c_hid_desc)];
129 struct i2c_hid_desc hdesc; /* the HID Descriptor */
131 __le16 wHIDDescRegister; /* location of the i2c
132 * register of the HID
134 unsigned int bufsize; /* i2c buffer size */
135 char *inbuf; /* Input buffer */
136 char *cmdbuf; /* Command buffer */
137 char *argsbuf; /* Command arguments buffer */
139 unsigned long flags; /* device flags */
141 int irq; /* the interrupt line irq */
143 wait_queue_head_t wait; /* For waiting the interrupt */
146 static int __i2c_hid_command(struct i2c_client *client,
147 const struct i2c_hid_cmd *command, u8 reportID,
148 u8 reportType, u8 *args, int args_len,
149 unsigned char *buf_recv, int data_len)
151 struct i2c_hid *ihid = i2c_get_clientdata(client);
152 union command *cmd = (union command *)ihid->cmdbuf;
154 struct i2c_msg msg[2];
157 int length = command->length;
158 bool wait = command->wait;
159 unsigned int registerIndex = command->registerIndex;
161 /* special case for hid_descr_cmd */
162 if (command == &hid_descr_cmd) {
163 cmd->c.reg = ihid->wHIDDescRegister;
165 cmd->data[0] = ihid->hdesc_buffer[registerIndex];
166 cmd->data[1] = ihid->hdesc_buffer[registerIndex + 1];
170 cmd->c.opcode = command->opcode;
171 cmd->c.reportTypeID = reportID | reportType << 4;
174 memcpy(cmd->data + length, args, args_len);
177 i2c_hid_dbg(ihid, "%s: cmd=%*ph\n", __func__, length, cmd->data);
179 msg[0].addr = client->addr;
180 msg[0].flags = client->flags & I2C_M_TEN;
182 msg[0].buf = cmd->data;
184 msg[1].addr = client->addr;
185 msg[1].flags = client->flags & I2C_M_TEN;
186 msg[1].flags |= I2C_M_RD;
187 msg[1].len = data_len;
188 msg[1].buf = buf_recv;
190 set_bit(I2C_HID_READ_PENDING, &ihid->flags);
194 set_bit(I2C_HID_RESET_PENDING, &ihid->flags);
196 ret = i2c_transfer(client->adapter, msg, msg_num);
199 clear_bit(I2C_HID_READ_PENDING, &ihid->flags);
202 return ret < 0 ? ret : -EIO;
207 i2c_hid_dbg(ihid, "%s: waiting...\n", __func__);
208 if (!wait_event_timeout(ihid->wait,
209 !test_bit(I2C_HID_RESET_PENDING, &ihid->flags),
210 msecs_to_jiffies(5000)))
212 i2c_hid_dbg(ihid, "%s: finished.\n", __func__);
218 static int i2c_hid_command(struct i2c_client *client,
219 const struct i2c_hid_cmd *command,
220 unsigned char *buf_recv, int data_len)
222 return __i2c_hid_command(client, command, 0, 0, NULL, 0,
226 static int i2c_hid_get_report(struct i2c_client *client, u8 reportType,
227 u8 reportID, unsigned char *buf_recv, int data_len)
229 struct i2c_hid *ihid = i2c_get_clientdata(client);
233 u16 readRegister = le16_to_cpu(ihid->hdesc.wDataRegister);
235 i2c_hid_dbg(ihid, "%s\n", __func__);
237 if (reportID >= 0x0F) {
238 args[args_len++] = reportID;
242 args[args_len++] = readRegister & 0xFF;
243 args[args_len++] = readRegister >> 8;
245 ret = __i2c_hid_command(client, &hid_get_report_cmd, reportID,
246 reportType, args, args_len, buf_recv, data_len);
248 dev_err(&client->dev,
249 "failed to retrieve report from device.\n");
256 static int i2c_hid_set_report(struct i2c_client *client, u8 reportType,
257 u8 reportID, unsigned char *buf, size_t data_len)
259 struct i2c_hid *ihid = i2c_get_clientdata(client);
260 u8 *args = ihid->argsbuf;
262 u16 dataRegister = le16_to_cpu(ihid->hdesc.wDataRegister);
264 /* hidraw already checked that data_len < HID_MAX_BUFFER_SIZE */
265 u16 size = 2 /* size */ +
266 (reportID ? 1 : 0) /* reportID */ +
268 int args_len = (reportID >= 0x0F ? 1 : 0) /* optional third byte */ +
269 2 /* dataRegister */ +
273 i2c_hid_dbg(ihid, "%s\n", __func__);
275 if (reportID >= 0x0F) {
276 args[index++] = reportID;
280 args[index++] = dataRegister & 0xFF;
281 args[index++] = dataRegister >> 8;
283 args[index++] = size & 0xFF;
284 args[index++] = size >> 8;
287 args[index++] = reportID;
289 memcpy(&args[index], buf, data_len);
291 ret = __i2c_hid_command(client, &hid_set_report_cmd, reportID,
292 reportType, args, args_len, NULL, 0);
294 dev_err(&client->dev, "failed to set a report to device.\n");
301 static int i2c_hid_set_power(struct i2c_client *client, int power_state)
303 struct i2c_hid *ihid = i2c_get_clientdata(client);
306 i2c_hid_dbg(ihid, "%s\n", __func__);
308 ret = __i2c_hid_command(client, &hid_set_power_cmd, power_state,
309 0, NULL, 0, NULL, 0);
311 dev_err(&client->dev, "failed to change power setting.\n");
316 static int i2c_hid_hwreset(struct i2c_client *client)
318 struct i2c_hid *ihid = i2c_get_clientdata(client);
321 i2c_hid_dbg(ihid, "%s\n", __func__);
323 ret = i2c_hid_set_power(client, I2C_HID_PWR_ON);
327 i2c_hid_dbg(ihid, "resetting...\n");
329 ret = i2c_hid_command(client, &hid_reset_cmd, NULL, 0);
331 dev_err(&client->dev, "failed to reset device.\n");
332 i2c_hid_set_power(client, I2C_HID_PWR_SLEEP);
339 static int i2c_hid_get_input(struct i2c_hid *ihid)
342 int size = le16_to_cpu(ihid->hdesc.wMaxInputLength);
344 ret = i2c_master_recv(ihid->client, ihid->inbuf, size);
349 dev_err(&ihid->client->dev, "%s: got %d data instead of %d\n",
350 __func__, ret, size);
354 ret_size = ihid->inbuf[0] | ihid->inbuf[1] << 8;
357 /* host or device initiated RESET completed */
358 if (test_and_clear_bit(I2C_HID_RESET_PENDING, &ihid->flags))
359 wake_up(&ihid->wait);
363 if (ret_size > size) {
364 dev_err(&ihid->client->dev, "%s: incomplete report (%d/%d)\n",
365 __func__, size, ret_size);
369 i2c_hid_dbg(ihid, "input: %*ph\n", ret_size, ihid->inbuf);
371 if (test_bit(I2C_HID_STARTED, &ihid->flags))
372 hid_input_report(ihid->hid, HID_INPUT_REPORT, ihid->inbuf + 2,
378 static irqreturn_t i2c_hid_irq(int irq, void *dev_id)
380 struct i2c_hid *ihid = dev_id;
382 if (test_bit(I2C_HID_READ_PENDING, &ihid->flags))
385 i2c_hid_get_input(ihid);
390 static int i2c_hid_get_report_length(struct hid_report *report)
392 return ((report->size - 1) >> 3) + 1 +
393 report->device->report_enum[report->type].numbered + 2;
396 static void i2c_hid_init_report(struct hid_report *report, u8 *buffer,
399 struct hid_device *hid = report->device;
400 struct i2c_client *client = hid->driver_data;
401 struct i2c_hid *ihid = i2c_get_clientdata(client);
402 unsigned int size, ret_size;
404 size = i2c_hid_get_report_length(report);
405 i2c_hid_get_report(client,
406 report->type == HID_FEATURE_REPORT ? 0x03 : 0x01,
407 report->id, buffer, size);
409 i2c_hid_dbg(ihid, "report (len=%d): %*ph\n", size, size, ihid->inbuf);
411 ret_size = buffer[0] | (buffer[1] << 8);
413 if (ret_size != size) {
414 dev_err(&client->dev, "error in %s size:%d / ret_size:%d\n",
415 __func__, size, ret_size);
419 /* hid->driver_lock is held as we are in probe function,
420 * we just need to setup the input fields, so using
421 * hid_report_raw_event is safe. */
422 hid_report_raw_event(hid, report->type, buffer + 2, size - 2, 1);
426 * Initialize all reports
428 static void i2c_hid_init_reports(struct hid_device *hid)
430 struct hid_report *report;
431 struct i2c_client *client = hid->driver_data;
432 struct i2c_hid *ihid = i2c_get_clientdata(client);
433 u8 *inbuf = kzalloc(ihid->bufsize, GFP_KERNEL);
438 list_for_each_entry(report,
439 &hid->report_enum[HID_INPUT_REPORT].report_list, list)
440 i2c_hid_init_report(report, inbuf, ihid->bufsize);
442 list_for_each_entry(report,
443 &hid->report_enum[HID_FEATURE_REPORT].report_list, list)
444 i2c_hid_init_report(report, inbuf, ihid->bufsize);
450 * Traverse the supplied list of reports and find the longest
452 static void i2c_hid_find_max_report(struct hid_device *hid, unsigned int type,
455 struct hid_report *report;
458 /* We should not rely on wMaxInputLength, as some devices may set it to
460 list_for_each_entry(report, &hid->report_enum[type].report_list, list) {
461 size = i2c_hid_get_report_length(report);
467 static int i2c_hid_alloc_buffers(struct i2c_hid *ihid)
469 /* the worst case is computed from the set_report command with a
470 * reportID > 15 and the maximum report length */
471 int args_len = sizeof(__u8) + /* optional ReportID byte */
472 sizeof(__u16) + /* data register */
473 sizeof(__u16) + /* size of the report */
474 ihid->bufsize; /* report */
476 ihid->inbuf = kzalloc(ihid->bufsize, GFP_KERNEL);
481 ihid->argsbuf = kzalloc(args_len, GFP_KERNEL);
483 if (!ihid->argsbuf) {
488 ihid->cmdbuf = kzalloc(sizeof(union command) + args_len, GFP_KERNEL);
492 kfree(ihid->argsbuf);
494 ihid->argsbuf = NULL;
501 static void i2c_hid_free_buffers(struct i2c_hid *ihid)
504 kfree(ihid->argsbuf);
508 ihid->argsbuf = NULL;
511 static int i2c_hid_get_raw_report(struct hid_device *hid,
512 unsigned char report_number, __u8 *buf, size_t count,
513 unsigned char report_type)
515 struct i2c_client *client = hid->driver_data;
516 struct i2c_hid *ihid = i2c_get_clientdata(client);
519 if (report_type == HID_OUTPUT_REPORT)
522 if (count > ihid->bufsize)
523 count = ihid->bufsize;
525 ret = i2c_hid_get_report(client,
526 report_type == HID_FEATURE_REPORT ? 0x03 : 0x01,
527 report_number, ihid->inbuf, count);
532 count = ihid->inbuf[0] | (ihid->inbuf[1] << 8);
534 memcpy(buf, ihid->inbuf + 2, count);
539 static int i2c_hid_output_raw_report(struct hid_device *hid, __u8 *buf,
540 size_t count, unsigned char report_type)
542 struct i2c_client *client = hid->driver_data;
543 int report_id = buf[0];
545 if (report_type == HID_INPUT_REPORT)
548 return i2c_hid_set_report(client,
549 report_type == HID_FEATURE_REPORT ? 0x03 : 0x02,
550 report_id, buf, count);
553 static int i2c_hid_parse(struct hid_device *hid)
555 struct i2c_client *client = hid->driver_data;
556 struct i2c_hid *ihid = i2c_get_clientdata(client);
557 struct i2c_hid_desc *hdesc = &ihid->hdesc;
563 i2c_hid_dbg(ihid, "entering %s\n", __func__);
565 rsize = le16_to_cpu(hdesc->wReportDescLength);
566 if (!rsize || rsize > HID_MAX_DESCRIPTOR_SIZE) {
567 dbg_hid("weird size of report descriptor (%u)\n", rsize);
572 ret = i2c_hid_hwreset(client);
575 } while (tries-- > 0 && ret);
580 rdesc = kzalloc(rsize, GFP_KERNEL);
583 dbg_hid("couldn't allocate rdesc memory\n");
587 i2c_hid_dbg(ihid, "asking HID report descriptor\n");
589 ret = i2c_hid_command(client, &hid_report_descr_cmd, rdesc, rsize);
591 hid_err(hid, "reading report descriptor failed\n");
596 i2c_hid_dbg(ihid, "Report Descriptor: %*ph\n", rsize, rdesc);
598 ret = hid_parse_report(hid, rdesc, rsize);
601 dbg_hid("parsing report descriptor failed\n");
608 static int i2c_hid_start(struct hid_device *hid)
610 struct i2c_client *client = hid->driver_data;
611 struct i2c_hid *ihid = i2c_get_clientdata(client);
613 int old_bufsize = ihid->bufsize;
615 ihid->bufsize = HID_MIN_BUFFER_SIZE;
616 i2c_hid_find_max_report(hid, HID_INPUT_REPORT, &ihid->bufsize);
617 i2c_hid_find_max_report(hid, HID_OUTPUT_REPORT, &ihid->bufsize);
618 i2c_hid_find_max_report(hid, HID_FEATURE_REPORT, &ihid->bufsize);
620 if (ihid->bufsize > old_bufsize || !ihid->inbuf || !ihid->cmdbuf) {
621 i2c_hid_free_buffers(ihid);
623 ret = i2c_hid_alloc_buffers(ihid);
626 ihid->bufsize = old_bufsize;
631 if (!(hid->quirks & HID_QUIRK_NO_INIT_REPORTS))
632 i2c_hid_init_reports(hid);
637 static void i2c_hid_stop(struct hid_device *hid)
639 struct i2c_client *client = hid->driver_data;
640 struct i2c_hid *ihid = i2c_get_clientdata(client);
644 i2c_hid_free_buffers(ihid);
647 static int i2c_hid_open(struct hid_device *hid)
649 struct i2c_client *client = hid->driver_data;
650 struct i2c_hid *ihid = i2c_get_clientdata(client);
654 ret = i2c_hid_set_power(client, I2C_HID_PWR_ON);
659 set_bit(I2C_HID_STARTED, &ihid->flags);
664 static void i2c_hid_close(struct hid_device *hid)
666 struct i2c_client *client = hid->driver_data;
667 struct i2c_hid *ihid = i2c_get_clientdata(client);
669 /* protecting hid->open to make sure we don't restart
670 * data acquistion due to a resumption we no longer
674 clear_bit(I2C_HID_STARTED, &ihid->flags);
676 /* Save some power */
677 i2c_hid_set_power(client, I2C_HID_PWR_SLEEP);
681 static int i2c_hid_power(struct hid_device *hid, int lvl)
683 struct i2c_client *client = hid->driver_data;
684 struct i2c_hid *ihid = i2c_get_clientdata(client);
687 i2c_hid_dbg(ihid, "%s lvl:%d\n", __func__, lvl);
691 ret = i2c_hid_set_power(client, I2C_HID_PWR_ON);
694 ret = i2c_hid_set_power(client, I2C_HID_PWR_SLEEP);
700 static int i2c_hid_hidinput_input_event(struct input_dev *dev,
701 unsigned int type, unsigned int code, int value)
703 struct hid_device *hid = input_get_drvdata(dev);
704 struct hid_field *field;
708 return input_ff_event(dev, type, code, value);
713 offset = hidinput_find_field(hid, type, code, &field);
716 hid_warn(dev, "event field not found\n");
720 hid_set_field(field, offset, value);
725 static struct hid_ll_driver i2c_hid_ll_driver = {
726 .parse = i2c_hid_parse,
727 .start = i2c_hid_start,
728 .stop = i2c_hid_stop,
729 .open = i2c_hid_open,
730 .close = i2c_hid_close,
731 .power = i2c_hid_power,
732 .hidinput_input_event = i2c_hid_hidinput_input_event,
735 static int __devinit i2c_hid_init_irq(struct i2c_client *client)
737 struct i2c_hid *ihid = i2c_get_clientdata(client);
740 dev_dbg(&client->dev, "Requesting IRQ: %d\n", client->irq);
742 ret = request_threaded_irq(client->irq, NULL, i2c_hid_irq,
743 IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
746 dev_dbg(&client->dev,
747 "Could not register for %s interrupt, irq = %d,"
749 client->name, client->irq, ret);
754 ihid->irq = client->irq;
759 static int __devinit i2c_hid_fetch_hid_descriptor(struct i2c_hid *ihid)
761 struct i2c_client *client = ihid->client;
762 struct i2c_hid_desc *hdesc = &ihid->hdesc;
766 /* Fetch the length of HID description, retrieve the 4 first bytes:
767 * bytes 0-1 -> length
768 * bytes 2-3 -> bcdVersion (has to be 1.00) */
769 ret = i2c_hid_command(client, &hid_descr_cmd, ihid->hdesc_buffer, 4);
771 i2c_hid_dbg(ihid, "%s, ihid->hdesc_buffer: %*ph\n",
772 __func__, 4, ihid->hdesc_buffer);
775 dev_err(&client->dev, "HID_DESCR_LENGTH_CMD Fail (ret=%d)\n",
780 dsize = le16_to_cpu(hdesc->wHIDDescLength);
781 if (!dsize || dsize > HID_MAX_DESCRIPTOR_SIZE) {
782 dev_err(&client->dev, "weird size of HID descriptor (%u)\n",
787 /* check bcdVersion == 1.0 */
788 if (le16_to_cpu(hdesc->bcdVersion) != 0x0100) {
789 dev_err(&client->dev,
790 "unexpected HID descriptor bcdVersion (0x%04x)\n",
791 le16_to_cpu(hdesc->bcdVersion));
795 i2c_hid_dbg(ihid, "Fetching the HID descriptor\n");
797 ret = i2c_hid_command(client, &hid_descr_cmd, ihid->hdesc_buffer,
800 dev_err(&client->dev, "hid_descr_cmd Fail\n");
804 i2c_hid_dbg(ihid, "HID Descriptor: %*ph\n", dsize, ihid->hdesc_buffer);
809 static int __devinit i2c_hid_probe(struct i2c_client *client,
810 const struct i2c_device_id *dev_id)
813 struct i2c_hid *ihid;
814 struct hid_device *hid;
816 struct i2c_hid_platform_data *platform_data = client->dev.platform_data;
818 dbg_hid("HID probe called for i2c 0x%02x\n", client->addr);
820 if (!platform_data) {
821 dev_err(&client->dev, "HID register address not provided\n");
826 dev_err(&client->dev,
827 "HID over i2c has not been provided an Int IRQ\n");
831 ihid = kzalloc(sizeof(struct i2c_hid), GFP_KERNEL);
835 i2c_set_clientdata(client, ihid);
837 ihid->client = client;
839 hidRegister = platform_data->hid_descriptor_address;
840 ihid->wHIDDescRegister = cpu_to_le16(hidRegister);
842 init_waitqueue_head(&ihid->wait);
844 /* we need to allocate the command buffer without knowing the maximum
845 * size of the reports. Let's use HID_MIN_BUFFER_SIZE, then we do the
846 * real computation later. */
847 ihid->bufsize = HID_MIN_BUFFER_SIZE;
848 i2c_hid_alloc_buffers(ihid);
850 ret = i2c_hid_fetch_hid_descriptor(ihid);
854 ret = i2c_hid_init_irq(client);
858 hid = hid_allocate_device();
866 hid->driver_data = client;
867 hid->ll_driver = &i2c_hid_ll_driver;
868 hid->hid_get_raw_report = i2c_hid_get_raw_report;
869 hid->hid_output_raw_report = i2c_hid_output_raw_report;
870 hid->dev.parent = &client->dev;
872 hid->version = le16_to_cpu(ihid->hdesc.bcdVersion);
873 hid->vendor = le16_to_cpu(ihid->hdesc.wVendorID);
874 hid->product = le16_to_cpu(ihid->hdesc.wProductID);
876 snprintf(hid->name, sizeof(hid->name), "%s %04X:%04X",
877 client->name, hid->vendor, hid->product);
879 ret = hid_add_device(hid);
882 hid_err(client, "can't add hid device: %d\n", ret);
889 hid_destroy_device(hid);
893 free_irq(ihid->irq, ihid);
895 i2c_hid_free_buffers(ihid);
900 static int __devexit i2c_hid_remove(struct i2c_client *client)
902 struct i2c_hid *ihid = i2c_get_clientdata(client);
903 struct hid_device *hid;
909 hid_destroy_device(hid);
911 free_irq(client->irq, ihid);
918 #ifdef CONFIG_PM_SLEEP
919 static int i2c_hid_suspend(struct device *dev)
921 struct i2c_client *client = to_i2c_client(dev);
922 struct i2c_hid *ihid = i2c_get_clientdata(client);
924 if (device_may_wakeup(&client->dev))
925 enable_irq_wake(ihid->irq);
927 /* Save some power */
928 i2c_hid_set_power(client, I2C_HID_PWR_SLEEP);
933 static int i2c_hid_resume(struct device *dev)
936 struct i2c_client *client = to_i2c_client(dev);
938 ret = i2c_hid_hwreset(client);
942 if (device_may_wakeup(&client->dev))
943 disable_irq_wake(client->irq);
949 static SIMPLE_DEV_PM_OPS(i2c_hid_pm, i2c_hid_suspend, i2c_hid_resume);
951 static const struct i2c_device_id i2c_hid_id_table[] = {
955 MODULE_DEVICE_TABLE(i2c, i2c_hid_id_table);
958 static struct i2c_driver i2c_hid_driver = {
961 .owner = THIS_MODULE,
965 .probe = i2c_hid_probe,
966 .remove = __devexit_p(i2c_hid_remove),
968 .id_table = i2c_hid_id_table,
971 module_i2c_driver(i2c_hid_driver);
973 MODULE_DESCRIPTION("HID over I2C core driver");
974 MODULE_AUTHOR("Benjamin Tissoires <benjamin.tissoires@gmail.com>");
975 MODULE_LICENSE("GPL");