Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/hid/hid
[muen/linux.git] / drivers / hid / i2c-hid / i2c-hid-core.c
1 /*
2  * HID over I2C protocol implementation
3  *
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
7  *
8  * This code is partly based on "USB HID support for Linux":
9  *
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
15  *
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
18  * more details.
19  */
20
21 #include <linux/module.h>
22 #include <linux/i2c.h>
23 #include <linux/interrupt.h>
24 #include <linux/input.h>
25 #include <linux/irq.h>
26 #include <linux/delay.h>
27 #include <linux/slab.h>
28 #include <linux/pm.h>
29 #include <linux/pm_runtime.h>
30 #include <linux/device.h>
31 #include <linux/wait.h>
32 #include <linux/err.h>
33 #include <linux/string.h>
34 #include <linux/list.h>
35 #include <linux/jiffies.h>
36 #include <linux/kernel.h>
37 #include <linux/hid.h>
38 #include <linux/mutex.h>
39 #include <linux/acpi.h>
40 #include <linux/of.h>
41 #include <linux/regulator/consumer.h>
42
43 #include <linux/platform_data/i2c-hid.h>
44
45 #include "../hid-ids.h"
46 #include "i2c-hid.h"
47
48 /* quirks to control the device */
49 #define I2C_HID_QUIRK_SET_PWR_WAKEUP_DEV        BIT(0)
50 #define I2C_HID_QUIRK_NO_IRQ_AFTER_RESET        BIT(1)
51 #define I2C_HID_QUIRK_NO_RUNTIME_PM             BIT(2)
52 #define I2C_HID_QUIRK_DELAY_AFTER_SLEEP         BIT(3)
53
54 /* flags */
55 #define I2C_HID_STARTED         0
56 #define I2C_HID_RESET_PENDING   1
57 #define I2C_HID_READ_PENDING    2
58
59 #define I2C_HID_PWR_ON          0x00
60 #define I2C_HID_PWR_SLEEP       0x01
61
62 /* debug option */
63 static bool debug;
64 module_param(debug, bool, 0444);
65 MODULE_PARM_DESC(debug, "print a lot of debug information");
66
67 #define i2c_hid_dbg(ihid, fmt, arg...)                                    \
68 do {                                                                      \
69         if (debug)                                                        \
70                 dev_printk(KERN_DEBUG, &(ihid)->client->dev, fmt, ##arg); \
71 } while (0)
72
73 struct i2c_hid_desc {
74         __le16 wHIDDescLength;
75         __le16 bcdVersion;
76         __le16 wReportDescLength;
77         __le16 wReportDescRegister;
78         __le16 wInputRegister;
79         __le16 wMaxInputLength;
80         __le16 wOutputRegister;
81         __le16 wMaxOutputLength;
82         __le16 wCommandRegister;
83         __le16 wDataRegister;
84         __le16 wVendorID;
85         __le16 wProductID;
86         __le16 wVersionID;
87         __le32 reserved;
88 } __packed;
89
90 struct i2c_hid_cmd {
91         unsigned int registerIndex;
92         __u8 opcode;
93         unsigned int length;
94         bool wait;
95 };
96
97 union command {
98         u8 data[0];
99         struct cmd {
100                 __le16 reg;
101                 __u8 reportTypeID;
102                 __u8 opcode;
103         } __packed c;
104 };
105
106 #define I2C_HID_CMD(opcode_) \
107         .opcode = opcode_, .length = 4, \
108         .registerIndex = offsetof(struct i2c_hid_desc, wCommandRegister)
109
110 /* fetch HID descriptor */
111 static const struct i2c_hid_cmd hid_descr_cmd = { .length = 2 };
112 /* fetch report descriptors */
113 static const struct i2c_hid_cmd hid_report_descr_cmd = {
114                 .registerIndex = offsetof(struct i2c_hid_desc,
115                         wReportDescRegister),
116                 .opcode = 0x00,
117                 .length = 2 };
118 /* commands */
119 static const struct i2c_hid_cmd hid_reset_cmd =         { I2C_HID_CMD(0x01),
120                                                           .wait = true };
121 static const struct i2c_hid_cmd hid_get_report_cmd =    { I2C_HID_CMD(0x02) };
122 static const struct i2c_hid_cmd hid_set_report_cmd =    { I2C_HID_CMD(0x03) };
123 static const struct i2c_hid_cmd hid_set_power_cmd =     { I2C_HID_CMD(0x08) };
124 static const struct i2c_hid_cmd hid_no_cmd =            { .length = 0 };
125
126 /*
127  * These definitions are not used here, but are defined by the spec.
128  * Keeping them here for documentation purposes.
129  *
130  * static const struct i2c_hid_cmd hid_get_idle_cmd = { I2C_HID_CMD(0x04) };
131  * static const struct i2c_hid_cmd hid_set_idle_cmd = { I2C_HID_CMD(0x05) };
132  * static const struct i2c_hid_cmd hid_get_protocol_cmd = { I2C_HID_CMD(0x06) };
133  * static const struct i2c_hid_cmd hid_set_protocol_cmd = { I2C_HID_CMD(0x07) };
134  */
135
136 /* The main device structure */
137 struct i2c_hid {
138         struct i2c_client       *client;        /* i2c client */
139         struct hid_device       *hid;   /* pointer to corresponding HID dev */
140         union {
141                 __u8 hdesc_buffer[sizeof(struct i2c_hid_desc)];
142                 struct i2c_hid_desc hdesc;      /* the HID Descriptor */
143         };
144         __le16                  wHIDDescRegister; /* location of the i2c
145                                                    * register of the HID
146                                                    * descriptor. */
147         unsigned int            bufsize;        /* i2c buffer size */
148         u8                      *inbuf;         /* Input buffer */
149         u8                      *rawbuf;        /* Raw Input buffer */
150         u8                      *cmdbuf;        /* Command buffer */
151         u8                      *argsbuf;       /* Command arguments buffer */
152
153         unsigned long           flags;          /* device flags */
154         unsigned long           quirks;         /* Various quirks */
155
156         wait_queue_head_t       wait;           /* For waiting the interrupt */
157
158         struct i2c_hid_platform_data pdata;
159
160         bool                    irq_wake_enabled;
161         struct mutex            reset_lock;
162
163         unsigned long           sleep_delay;
164 };
165
166 static const struct i2c_hid_quirks {
167         __u16 idVendor;
168         __u16 idProduct;
169         __u32 quirks;
170 } i2c_hid_quirks[] = {
171         { USB_VENDOR_ID_WEIDA, USB_DEVICE_ID_WEIDA_8752,
172                 I2C_HID_QUIRK_SET_PWR_WAKEUP_DEV },
173         { USB_VENDOR_ID_WEIDA, USB_DEVICE_ID_WEIDA_8755,
174                 I2C_HID_QUIRK_SET_PWR_WAKEUP_DEV },
175         { I2C_VENDOR_ID_HANTICK, I2C_PRODUCT_ID_HANTICK_5288,
176                 I2C_HID_QUIRK_NO_IRQ_AFTER_RESET |
177                 I2C_HID_QUIRK_NO_RUNTIME_PM },
178         { I2C_VENDOR_ID_RAYDIUM, I2C_PRODUCT_ID_RAYDIUM_4B33,
179                 I2C_HID_QUIRK_DELAY_AFTER_SLEEP },
180         { 0, 0 }
181 };
182
183 /*
184  * i2c_hid_lookup_quirk: return any quirks associated with a I2C HID device
185  * @idVendor: the 16-bit vendor ID
186  * @idProduct: the 16-bit product ID
187  *
188  * Returns: a u32 quirks value.
189  */
190 static u32 i2c_hid_lookup_quirk(const u16 idVendor, const u16 idProduct)
191 {
192         u32 quirks = 0;
193         int n;
194
195         for (n = 0; i2c_hid_quirks[n].idVendor; n++)
196                 if (i2c_hid_quirks[n].idVendor == idVendor &&
197                     (i2c_hid_quirks[n].idProduct == (__u16)HID_ANY_ID ||
198                      i2c_hid_quirks[n].idProduct == idProduct))
199                         quirks = i2c_hid_quirks[n].quirks;
200
201         return quirks;
202 }
203
204 static int __i2c_hid_command(struct i2c_client *client,
205                 const struct i2c_hid_cmd *command, u8 reportID,
206                 u8 reportType, u8 *args, int args_len,
207                 unsigned char *buf_recv, int data_len)
208 {
209         struct i2c_hid *ihid = i2c_get_clientdata(client);
210         union command *cmd = (union command *)ihid->cmdbuf;
211         int ret;
212         struct i2c_msg msg[2];
213         int msg_num = 1;
214
215         int length = command->length;
216         bool wait = command->wait;
217         unsigned int registerIndex = command->registerIndex;
218
219         /* special case for hid_descr_cmd */
220         if (command == &hid_descr_cmd) {
221                 cmd->c.reg = ihid->wHIDDescRegister;
222         } else {
223                 cmd->data[0] = ihid->hdesc_buffer[registerIndex];
224                 cmd->data[1] = ihid->hdesc_buffer[registerIndex + 1];
225         }
226
227         if (length > 2) {
228                 cmd->c.opcode = command->opcode;
229                 cmd->c.reportTypeID = reportID | reportType << 4;
230         }
231
232         memcpy(cmd->data + length, args, args_len);
233         length += args_len;
234
235         i2c_hid_dbg(ihid, "%s: cmd=%*ph\n", __func__, length, cmd->data);
236
237         msg[0].addr = client->addr;
238         msg[0].flags = client->flags & I2C_M_TEN;
239         msg[0].len = length;
240         msg[0].buf = cmd->data;
241         if (data_len > 0) {
242                 msg[1].addr = client->addr;
243                 msg[1].flags = client->flags & I2C_M_TEN;
244                 msg[1].flags |= I2C_M_RD;
245                 msg[1].len = data_len;
246                 msg[1].buf = buf_recv;
247                 msg_num = 2;
248                 set_bit(I2C_HID_READ_PENDING, &ihid->flags);
249         }
250
251         if (wait)
252                 set_bit(I2C_HID_RESET_PENDING, &ihid->flags);
253
254         ret = i2c_transfer(client->adapter, msg, msg_num);
255
256         if (data_len > 0)
257                 clear_bit(I2C_HID_READ_PENDING, &ihid->flags);
258
259         if (ret != msg_num)
260                 return ret < 0 ? ret : -EIO;
261
262         ret = 0;
263
264         if (wait && (ihid->quirks & I2C_HID_QUIRK_NO_IRQ_AFTER_RESET)) {
265                 msleep(100);
266         } else if (wait) {
267                 i2c_hid_dbg(ihid, "%s: waiting...\n", __func__);
268                 if (!wait_event_timeout(ihid->wait,
269                                 !test_bit(I2C_HID_RESET_PENDING, &ihid->flags),
270                                 msecs_to_jiffies(5000)))
271                         ret = -ENODATA;
272                 i2c_hid_dbg(ihid, "%s: finished.\n", __func__);
273         }
274
275         return ret;
276 }
277
278 static int i2c_hid_command(struct i2c_client *client,
279                 const struct i2c_hid_cmd *command,
280                 unsigned char *buf_recv, int data_len)
281 {
282         return __i2c_hid_command(client, command, 0, 0, NULL, 0,
283                                 buf_recv, data_len);
284 }
285
286 static int i2c_hid_get_report(struct i2c_client *client, u8 reportType,
287                 u8 reportID, unsigned char *buf_recv, int data_len)
288 {
289         struct i2c_hid *ihid = i2c_get_clientdata(client);
290         u8 args[3];
291         int ret;
292         int args_len = 0;
293         u16 readRegister = le16_to_cpu(ihid->hdesc.wDataRegister);
294
295         i2c_hid_dbg(ihid, "%s\n", __func__);
296
297         if (reportID >= 0x0F) {
298                 args[args_len++] = reportID;
299                 reportID = 0x0F;
300         }
301
302         args[args_len++] = readRegister & 0xFF;
303         args[args_len++] = readRegister >> 8;
304
305         ret = __i2c_hid_command(client, &hid_get_report_cmd, reportID,
306                 reportType, args, args_len, buf_recv, data_len);
307         if (ret) {
308                 dev_err(&client->dev,
309                         "failed to retrieve report from device.\n");
310                 return ret;
311         }
312
313         return 0;
314 }
315
316 /**
317  * i2c_hid_set_or_send_report: forward an incoming report to the device
318  * @client: the i2c_client of the device
319  * @reportType: 0x03 for HID_FEATURE_REPORT ; 0x02 for HID_OUTPUT_REPORT
320  * @reportID: the report ID
321  * @buf: the actual data to transfer, without the report ID
322  * @len: size of buf
323  * @use_data: true: use SET_REPORT HID command, false: send plain OUTPUT report
324  */
325 static int i2c_hid_set_or_send_report(struct i2c_client *client, u8 reportType,
326                 u8 reportID, unsigned char *buf, size_t data_len, bool use_data)
327 {
328         struct i2c_hid *ihid = i2c_get_clientdata(client);
329         u8 *args = ihid->argsbuf;
330         const struct i2c_hid_cmd *hidcmd;
331         int ret;
332         u16 dataRegister = le16_to_cpu(ihid->hdesc.wDataRegister);
333         u16 outputRegister = le16_to_cpu(ihid->hdesc.wOutputRegister);
334         u16 maxOutputLength = le16_to_cpu(ihid->hdesc.wMaxOutputLength);
335         u16 size;
336         int args_len;
337         int index = 0;
338
339         i2c_hid_dbg(ihid, "%s\n", __func__);
340
341         if (data_len > ihid->bufsize)
342                 return -EINVAL;
343
344         size =          2                       /* size */ +
345                         (reportID ? 1 : 0)      /* reportID */ +
346                         data_len                /* buf */;
347         args_len =      (reportID >= 0x0F ? 1 : 0) /* optional third byte */ +
348                         2                       /* dataRegister */ +
349                         size                    /* args */;
350
351         if (!use_data && maxOutputLength == 0)
352                 return -ENOSYS;
353
354         if (reportID >= 0x0F) {
355                 args[index++] = reportID;
356                 reportID = 0x0F;
357         }
358
359         /*
360          * use the data register for feature reports or if the device does not
361          * support the output register
362          */
363         if (use_data) {
364                 args[index++] = dataRegister & 0xFF;
365                 args[index++] = dataRegister >> 8;
366                 hidcmd = &hid_set_report_cmd;
367         } else {
368                 args[index++] = outputRegister & 0xFF;
369                 args[index++] = outputRegister >> 8;
370                 hidcmd = &hid_no_cmd;
371         }
372
373         args[index++] = size & 0xFF;
374         args[index++] = size >> 8;
375
376         if (reportID)
377                 args[index++] = reportID;
378
379         memcpy(&args[index], buf, data_len);
380
381         ret = __i2c_hid_command(client, hidcmd, reportID,
382                 reportType, args, args_len, NULL, 0);
383         if (ret) {
384                 dev_err(&client->dev, "failed to set a report to device.\n");
385                 return ret;
386         }
387
388         return data_len;
389 }
390
391 static int i2c_hid_set_power(struct i2c_client *client, int power_state)
392 {
393         struct i2c_hid *ihid = i2c_get_clientdata(client);
394         int ret;
395         unsigned long now, delay;
396
397         i2c_hid_dbg(ihid, "%s\n", __func__);
398
399         /*
400          * Some devices require to send a command to wakeup before power on.
401          * The call will get a return value (EREMOTEIO) but device will be
402          * triggered and activated. After that, it goes like a normal device.
403          */
404         if (power_state == I2C_HID_PWR_ON &&
405             ihid->quirks & I2C_HID_QUIRK_SET_PWR_WAKEUP_DEV) {
406                 ret = i2c_hid_command(client, &hid_set_power_cmd, NULL, 0);
407
408                 /* Device was already activated */
409                 if (!ret)
410                         goto set_pwr_exit;
411         }
412
413         if (ihid->quirks & I2C_HID_QUIRK_DELAY_AFTER_SLEEP &&
414             power_state == I2C_HID_PWR_ON) {
415                 now = jiffies;
416                 if (time_after(ihid->sleep_delay, now)) {
417                         delay = jiffies_to_usecs(ihid->sleep_delay - now);
418                         usleep_range(delay, delay + 1);
419                 }
420         }
421
422         ret = __i2c_hid_command(client, &hid_set_power_cmd, power_state,
423                 0, NULL, 0, NULL, 0);
424
425         if (ihid->quirks & I2C_HID_QUIRK_DELAY_AFTER_SLEEP &&
426             power_state == I2C_HID_PWR_SLEEP)
427                 ihid->sleep_delay = jiffies + msecs_to_jiffies(20);
428
429         if (ret)
430                 dev_err(&client->dev, "failed to change power setting.\n");
431
432 set_pwr_exit:
433         return ret;
434 }
435
436 static int i2c_hid_hwreset(struct i2c_client *client)
437 {
438         struct i2c_hid *ihid = i2c_get_clientdata(client);
439         int ret;
440
441         i2c_hid_dbg(ihid, "%s\n", __func__);
442
443         /*
444          * This prevents sending feature reports while the device is
445          * being reset. Otherwise we may lose the reset complete
446          * interrupt.
447          */
448         mutex_lock(&ihid->reset_lock);
449
450         ret = i2c_hid_set_power(client, I2C_HID_PWR_ON);
451         if (ret)
452                 goto out_unlock;
453
454         /*
455          * The HID over I2C specification states that if a DEVICE needs time
456          * after the PWR_ON request, it should utilise CLOCK stretching.
457          * However, it has been observered that the Windows driver provides a
458          * 1ms sleep between the PWR_ON and RESET requests and that some devices
459          * rely on this.
460          */
461         usleep_range(1000, 5000);
462
463         i2c_hid_dbg(ihid, "resetting...\n");
464
465         ret = i2c_hid_command(client, &hid_reset_cmd, NULL, 0);
466         if (ret) {
467                 dev_err(&client->dev, "failed to reset device.\n");
468                 i2c_hid_set_power(client, I2C_HID_PWR_SLEEP);
469         }
470
471 out_unlock:
472         mutex_unlock(&ihid->reset_lock);
473         return ret;
474 }
475
476 static void i2c_hid_get_input(struct i2c_hid *ihid)
477 {
478         int ret;
479         u32 ret_size;
480         int size = le16_to_cpu(ihid->hdesc.wMaxInputLength);
481
482         if (size > ihid->bufsize)
483                 size = ihid->bufsize;
484
485         ret = i2c_master_recv(ihid->client, ihid->inbuf, size);
486         if (ret != size) {
487                 if (ret < 0)
488                         return;
489
490                 dev_err(&ihid->client->dev, "%s: got %d data instead of %d\n",
491                         __func__, ret, size);
492                 return;
493         }
494
495         ret_size = ihid->inbuf[0] | ihid->inbuf[1] << 8;
496
497         if (!ret_size) {
498                 /* host or device initiated RESET completed */
499                 if (test_and_clear_bit(I2C_HID_RESET_PENDING, &ihid->flags))
500                         wake_up(&ihid->wait);
501                 return;
502         }
503
504         if ((ret_size > size) || (ret_size < 2)) {
505                 dev_err(&ihid->client->dev, "%s: incomplete report (%d/%d)\n",
506                         __func__, size, ret_size);
507                 return;
508         }
509
510         i2c_hid_dbg(ihid, "input: %*ph\n", ret_size, ihid->inbuf);
511
512         if (test_bit(I2C_HID_STARTED, &ihid->flags))
513                 hid_input_report(ihid->hid, HID_INPUT_REPORT, ihid->inbuf + 2,
514                                 ret_size - 2, 1);
515
516         return;
517 }
518
519 static irqreturn_t i2c_hid_irq(int irq, void *dev_id)
520 {
521         struct i2c_hid *ihid = dev_id;
522
523         if (test_bit(I2C_HID_READ_PENDING, &ihid->flags))
524                 return IRQ_HANDLED;
525
526         i2c_hid_get_input(ihid);
527
528         return IRQ_HANDLED;
529 }
530
531 static int i2c_hid_get_report_length(struct hid_report *report)
532 {
533         return ((report->size - 1) >> 3) + 1 +
534                 report->device->report_enum[report->type].numbered + 2;
535 }
536
537 /*
538  * Traverse the supplied list of reports and find the longest
539  */
540 static void i2c_hid_find_max_report(struct hid_device *hid, unsigned int type,
541                 unsigned int *max)
542 {
543         struct hid_report *report;
544         unsigned int size;
545
546         /* We should not rely on wMaxInputLength, as some devices may set it to
547          * a wrong length. */
548         list_for_each_entry(report, &hid->report_enum[type].report_list, list) {
549                 size = i2c_hid_get_report_length(report);
550                 if (*max < size)
551                         *max = size;
552         }
553 }
554
555 static void i2c_hid_free_buffers(struct i2c_hid *ihid)
556 {
557         kfree(ihid->inbuf);
558         kfree(ihid->rawbuf);
559         kfree(ihid->argsbuf);
560         kfree(ihid->cmdbuf);
561         ihid->inbuf = NULL;
562         ihid->rawbuf = NULL;
563         ihid->cmdbuf = NULL;
564         ihid->argsbuf = NULL;
565         ihid->bufsize = 0;
566 }
567
568 static int i2c_hid_alloc_buffers(struct i2c_hid *ihid, size_t report_size)
569 {
570         /* the worst case is computed from the set_report command with a
571          * reportID > 15 and the maximum report length */
572         int args_len = sizeof(__u8) + /* ReportID */
573                        sizeof(__u8) + /* optional ReportID byte */
574                        sizeof(__u16) + /* data register */
575                        sizeof(__u16) + /* size of the report */
576                        report_size; /* report */
577
578         ihid->inbuf = kzalloc(report_size, GFP_KERNEL);
579         ihid->rawbuf = kzalloc(report_size, GFP_KERNEL);
580         ihid->argsbuf = kzalloc(args_len, GFP_KERNEL);
581         ihid->cmdbuf = kzalloc(sizeof(union command) + args_len, GFP_KERNEL);
582
583         if (!ihid->inbuf || !ihid->rawbuf || !ihid->argsbuf || !ihid->cmdbuf) {
584                 i2c_hid_free_buffers(ihid);
585                 return -ENOMEM;
586         }
587
588         ihid->bufsize = report_size;
589
590         return 0;
591 }
592
593 static int i2c_hid_get_raw_report(struct hid_device *hid,
594                 unsigned char report_number, __u8 *buf, size_t count,
595                 unsigned char report_type)
596 {
597         struct i2c_client *client = hid->driver_data;
598         struct i2c_hid *ihid = i2c_get_clientdata(client);
599         size_t ret_count, ask_count;
600         int ret;
601
602         if (report_type == HID_OUTPUT_REPORT)
603                 return -EINVAL;
604
605         /* +2 bytes to include the size of the reply in the query buffer */
606         ask_count = min(count + 2, (size_t)ihid->bufsize);
607
608         ret = i2c_hid_get_report(client,
609                         report_type == HID_FEATURE_REPORT ? 0x03 : 0x01,
610                         report_number, ihid->rawbuf, ask_count);
611
612         if (ret < 0)
613                 return ret;
614
615         ret_count = ihid->rawbuf[0] | (ihid->rawbuf[1] << 8);
616
617         if (ret_count <= 2)
618                 return 0;
619
620         ret_count = min(ret_count, ask_count);
621
622         /* The query buffer contains the size, dropping it in the reply */
623         count = min(count, ret_count - 2);
624         memcpy(buf, ihid->rawbuf + 2, count);
625
626         return count;
627 }
628
629 static int i2c_hid_output_raw_report(struct hid_device *hid, __u8 *buf,
630                 size_t count, unsigned char report_type, bool use_data)
631 {
632         struct i2c_client *client = hid->driver_data;
633         struct i2c_hid *ihid = i2c_get_clientdata(client);
634         int report_id = buf[0];
635         int ret;
636
637         if (report_type == HID_INPUT_REPORT)
638                 return -EINVAL;
639
640         mutex_lock(&ihid->reset_lock);
641
642         if (report_id) {
643                 buf++;
644                 count--;
645         }
646
647         ret = i2c_hid_set_or_send_report(client,
648                                 report_type == HID_FEATURE_REPORT ? 0x03 : 0x02,
649                                 report_id, buf, count, use_data);
650
651         if (report_id && ret >= 0)
652                 ret++; /* add report_id to the number of transfered bytes */
653
654         mutex_unlock(&ihid->reset_lock);
655
656         return ret;
657 }
658
659 static int i2c_hid_output_report(struct hid_device *hid, __u8 *buf,
660                 size_t count)
661 {
662         return i2c_hid_output_raw_report(hid, buf, count, HID_OUTPUT_REPORT,
663                         false);
664 }
665
666 static int i2c_hid_raw_request(struct hid_device *hid, unsigned char reportnum,
667                                __u8 *buf, size_t len, unsigned char rtype,
668                                int reqtype)
669 {
670         switch (reqtype) {
671         case HID_REQ_GET_REPORT:
672                 return i2c_hid_get_raw_report(hid, reportnum, buf, len, rtype);
673         case HID_REQ_SET_REPORT:
674                 if (buf[0] != reportnum)
675                         return -EINVAL;
676                 return i2c_hid_output_raw_report(hid, buf, len, rtype, true);
677         default:
678                 return -EIO;
679         }
680 }
681
682 static int i2c_hid_parse(struct hid_device *hid)
683 {
684         struct i2c_client *client = hid->driver_data;
685         struct i2c_hid *ihid = i2c_get_clientdata(client);
686         struct i2c_hid_desc *hdesc = &ihid->hdesc;
687         unsigned int rsize;
688         char *rdesc;
689         int ret;
690         int tries = 3;
691         char *use_override;
692
693         i2c_hid_dbg(ihid, "entering %s\n", __func__);
694
695         rsize = le16_to_cpu(hdesc->wReportDescLength);
696         if (!rsize || rsize > HID_MAX_DESCRIPTOR_SIZE) {
697                 dbg_hid("weird size of report descriptor (%u)\n", rsize);
698                 return -EINVAL;
699         }
700
701         do {
702                 ret = i2c_hid_hwreset(client);
703                 if (ret)
704                         msleep(1000);
705         } while (tries-- > 0 && ret);
706
707         if (ret)
708                 return ret;
709
710         use_override = i2c_hid_get_dmi_hid_report_desc_override(client->name,
711                                                                 &rsize);
712
713         if (use_override) {
714                 rdesc = use_override;
715                 i2c_hid_dbg(ihid, "Using a HID report descriptor override\n");
716         } else {
717                 rdesc = kzalloc(rsize, GFP_KERNEL);
718
719                 if (!rdesc) {
720                         dbg_hid("couldn't allocate rdesc memory\n");
721                         return -ENOMEM;
722                 }
723
724                 i2c_hid_dbg(ihid, "asking HID report descriptor\n");
725
726                 ret = i2c_hid_command(client, &hid_report_descr_cmd,
727                                       rdesc, rsize);
728                 if (ret) {
729                         hid_err(hid, "reading report descriptor failed\n");
730                         kfree(rdesc);
731                         return -EIO;
732                 }
733         }
734
735         i2c_hid_dbg(ihid, "Report Descriptor: %*ph\n", rsize, rdesc);
736
737         ret = hid_parse_report(hid, rdesc, rsize);
738         if (!use_override)
739                 kfree(rdesc);
740
741         if (ret) {
742                 dbg_hid("parsing report descriptor failed\n");
743                 return ret;
744         }
745
746         return 0;
747 }
748
749 static int i2c_hid_start(struct hid_device *hid)
750 {
751         struct i2c_client *client = hid->driver_data;
752         struct i2c_hid *ihid = i2c_get_clientdata(client);
753         int ret;
754         unsigned int bufsize = HID_MIN_BUFFER_SIZE;
755
756         i2c_hid_find_max_report(hid, HID_INPUT_REPORT, &bufsize);
757         i2c_hid_find_max_report(hid, HID_OUTPUT_REPORT, &bufsize);
758         i2c_hid_find_max_report(hid, HID_FEATURE_REPORT, &bufsize);
759
760         if (bufsize > ihid->bufsize) {
761                 disable_irq(client->irq);
762                 i2c_hid_free_buffers(ihid);
763
764                 ret = i2c_hid_alloc_buffers(ihid, bufsize);
765                 enable_irq(client->irq);
766
767                 if (ret)
768                         return ret;
769         }
770
771         return 0;
772 }
773
774 static void i2c_hid_stop(struct hid_device *hid)
775 {
776         hid->claimed = 0;
777 }
778
779 static int i2c_hid_open(struct hid_device *hid)
780 {
781         struct i2c_client *client = hid->driver_data;
782         struct i2c_hid *ihid = i2c_get_clientdata(client);
783         int ret = 0;
784
785         ret = pm_runtime_get_sync(&client->dev);
786         if (ret < 0)
787                 return ret;
788
789         set_bit(I2C_HID_STARTED, &ihid->flags);
790         return 0;
791 }
792
793 static void i2c_hid_close(struct hid_device *hid)
794 {
795         struct i2c_client *client = hid->driver_data;
796         struct i2c_hid *ihid = i2c_get_clientdata(client);
797
798         clear_bit(I2C_HID_STARTED, &ihid->flags);
799
800         /* Save some power */
801         pm_runtime_put(&client->dev);
802 }
803
804 static int i2c_hid_power(struct hid_device *hid, int lvl)
805 {
806         struct i2c_client *client = hid->driver_data;
807         struct i2c_hid *ihid = i2c_get_clientdata(client);
808
809         i2c_hid_dbg(ihid, "%s lvl:%d\n", __func__, lvl);
810
811         switch (lvl) {
812         case PM_HINT_FULLON:
813                 pm_runtime_get_sync(&client->dev);
814                 break;
815         case PM_HINT_NORMAL:
816                 pm_runtime_put(&client->dev);
817                 break;
818         }
819         return 0;
820 }
821
822 struct hid_ll_driver i2c_hid_ll_driver = {
823         .parse = i2c_hid_parse,
824         .start = i2c_hid_start,
825         .stop = i2c_hid_stop,
826         .open = i2c_hid_open,
827         .close = i2c_hid_close,
828         .power = i2c_hid_power,
829         .output_report = i2c_hid_output_report,
830         .raw_request = i2c_hid_raw_request,
831 };
832 EXPORT_SYMBOL_GPL(i2c_hid_ll_driver);
833
834 static int i2c_hid_init_irq(struct i2c_client *client)
835 {
836         struct i2c_hid *ihid = i2c_get_clientdata(client);
837         unsigned long irqflags = 0;
838         int ret;
839
840         dev_dbg(&client->dev, "Requesting IRQ: %d\n", client->irq);
841
842         if (!irq_get_trigger_type(client->irq))
843                 irqflags = IRQF_TRIGGER_LOW;
844
845         ret = request_threaded_irq(client->irq, NULL, i2c_hid_irq,
846                                    irqflags | IRQF_ONESHOT, client->name, ihid);
847         if (ret < 0) {
848                 dev_warn(&client->dev,
849                         "Could not register for %s interrupt, irq = %d,"
850                         " ret = %d\n",
851                         client->name, client->irq, ret);
852
853                 return ret;
854         }
855
856         return 0;
857 }
858
859 static int i2c_hid_fetch_hid_descriptor(struct i2c_hid *ihid)
860 {
861         struct i2c_client *client = ihid->client;
862         struct i2c_hid_desc *hdesc = &ihid->hdesc;
863         unsigned int dsize;
864         int ret;
865
866         /* i2c hid fetch using a fixed descriptor size (30 bytes) */
867         if (i2c_hid_get_dmi_i2c_hid_desc_override(client->name)) {
868                 i2c_hid_dbg(ihid, "Using a HID descriptor override\n");
869                 ihid->hdesc =
870                         *i2c_hid_get_dmi_i2c_hid_desc_override(client->name);
871         } else {
872                 i2c_hid_dbg(ihid, "Fetching the HID descriptor\n");
873                 ret = i2c_hid_command(client, &hid_descr_cmd,
874                                       ihid->hdesc_buffer,
875                                       sizeof(struct i2c_hid_desc));
876                 if (ret) {
877                         dev_err(&client->dev, "hid_descr_cmd failed\n");
878                         return -ENODEV;
879                 }
880         }
881
882         /* Validate the length of HID descriptor, the 4 first bytes:
883          * bytes 0-1 -> length
884          * bytes 2-3 -> bcdVersion (has to be 1.00) */
885         /* check bcdVersion == 1.0 */
886         if (le16_to_cpu(hdesc->bcdVersion) != 0x0100) {
887                 dev_err(&client->dev,
888                         "unexpected HID descriptor bcdVersion (0x%04hx)\n",
889                         le16_to_cpu(hdesc->bcdVersion));
890                 return -ENODEV;
891         }
892
893         /* Descriptor length should be 30 bytes as per the specification */
894         dsize = le16_to_cpu(hdesc->wHIDDescLength);
895         if (dsize != sizeof(struct i2c_hid_desc)) {
896                 dev_err(&client->dev, "weird size of HID descriptor (%u)\n",
897                         dsize);
898                 return -ENODEV;
899         }
900         i2c_hid_dbg(ihid, "HID Descriptor: %*ph\n", dsize, ihid->hdesc_buffer);
901         return 0;
902 }
903
904 #ifdef CONFIG_ACPI
905 static const struct acpi_device_id i2c_hid_acpi_blacklist[] = {
906         /*
907          * The CHPN0001 ACPI device, which is used to describe the Chipone
908          * ICN8505 controller, has a _CID of PNP0C50 but is not HID compatible.
909          */
910         {"CHPN0001", 0 },
911         { },
912 };
913
914 static int i2c_hid_acpi_pdata(struct i2c_client *client,
915                 struct i2c_hid_platform_data *pdata)
916 {
917         static guid_t i2c_hid_guid =
918                 GUID_INIT(0x3CDFF6F7, 0x4267, 0x4555,
919                           0xAD, 0x05, 0xB3, 0x0A, 0x3D, 0x89, 0x38, 0xDE);
920         union acpi_object *obj;
921         struct acpi_device *adev;
922         acpi_handle handle;
923
924         handle = ACPI_HANDLE(&client->dev);
925         if (!handle || acpi_bus_get_device(handle, &adev)) {
926                 dev_err(&client->dev, "Error could not get ACPI device\n");
927                 return -ENODEV;
928         }
929
930         if (acpi_match_device_ids(adev, i2c_hid_acpi_blacklist) == 0)
931                 return -ENODEV;
932
933         obj = acpi_evaluate_dsm_typed(handle, &i2c_hid_guid, 1, 1, NULL,
934                                       ACPI_TYPE_INTEGER);
935         if (!obj) {
936                 dev_err(&client->dev, "Error _DSM call to get HID descriptor address failed\n");
937                 return -ENODEV;
938         }
939
940         pdata->hid_descriptor_address = obj->integer.value;
941         ACPI_FREE(obj);
942
943         return 0;
944 }
945
946 static void i2c_hid_acpi_fix_up_power(struct device *dev)
947 {
948         struct acpi_device *adev;
949
950         adev = ACPI_COMPANION(dev);
951         if (adev)
952                 acpi_device_fix_up_power(adev);
953 }
954
955 static const struct acpi_device_id i2c_hid_acpi_match[] = {
956         {"ACPI0C50", 0 },
957         {"PNP0C50", 0 },
958         { },
959 };
960 MODULE_DEVICE_TABLE(acpi, i2c_hid_acpi_match);
961 #else
962 static inline int i2c_hid_acpi_pdata(struct i2c_client *client,
963                 struct i2c_hid_platform_data *pdata)
964 {
965         return -ENODEV;
966 }
967
968 static inline void i2c_hid_acpi_fix_up_power(struct device *dev) {}
969 #endif
970
971 #ifdef CONFIG_OF
972 static int i2c_hid_of_probe(struct i2c_client *client,
973                 struct i2c_hid_platform_data *pdata)
974 {
975         struct device *dev = &client->dev;
976         u32 val;
977         int ret;
978
979         ret = of_property_read_u32(dev->of_node, "hid-descr-addr", &val);
980         if (ret) {
981                 dev_err(&client->dev, "HID register address not provided\n");
982                 return -ENODEV;
983         }
984         if (val >> 16) {
985                 dev_err(&client->dev, "Bad HID register address: 0x%08x\n",
986                         val);
987                 return -EINVAL;
988         }
989         pdata->hid_descriptor_address = val;
990
991         return 0;
992 }
993
994 static const struct of_device_id i2c_hid_of_match[] = {
995         { .compatible = "hid-over-i2c" },
996         {},
997 };
998 MODULE_DEVICE_TABLE(of, i2c_hid_of_match);
999 #else
1000 static inline int i2c_hid_of_probe(struct i2c_client *client,
1001                 struct i2c_hid_platform_data *pdata)
1002 {
1003         return -ENODEV;
1004 }
1005 #endif
1006
1007 static void i2c_hid_fwnode_probe(struct i2c_client *client,
1008                                  struct i2c_hid_platform_data *pdata)
1009 {
1010         u32 val;
1011
1012         if (!device_property_read_u32(&client->dev, "post-power-on-delay-ms",
1013                                       &val))
1014                 pdata->post_power_delay_ms = val;
1015 }
1016
1017 static int i2c_hid_probe(struct i2c_client *client,
1018                          const struct i2c_device_id *dev_id)
1019 {
1020         int ret;
1021         struct i2c_hid *ihid;
1022         struct hid_device *hid;
1023         __u16 hidRegister;
1024         struct i2c_hid_platform_data *platform_data = client->dev.platform_data;
1025
1026         dbg_hid("HID probe called for i2c 0x%02x\n", client->addr);
1027
1028         if (!client->irq) {
1029                 dev_err(&client->dev,
1030                         "HID over i2c has not been provided an Int IRQ\n");
1031                 return -EINVAL;
1032         }
1033
1034         if (client->irq < 0) {
1035                 if (client->irq != -EPROBE_DEFER)
1036                         dev_err(&client->dev,
1037                                 "HID over i2c doesn't have a valid IRQ\n");
1038                 return client->irq;
1039         }
1040
1041         ihid = devm_kzalloc(&client->dev, sizeof(*ihid), GFP_KERNEL);
1042         if (!ihid)
1043                 return -ENOMEM;
1044
1045         if (client->dev.of_node) {
1046                 ret = i2c_hid_of_probe(client, &ihid->pdata);
1047                 if (ret)
1048                         return ret;
1049         } else if (!platform_data) {
1050                 ret = i2c_hid_acpi_pdata(client, &ihid->pdata);
1051                 if (ret)
1052                         return ret;
1053         } else {
1054                 ihid->pdata = *platform_data;
1055         }
1056
1057         /* Parse platform agnostic common properties from ACPI / device tree */
1058         i2c_hid_fwnode_probe(client, &ihid->pdata);
1059
1060         ihid->pdata.supplies[0].supply = "vdd";
1061         ihid->pdata.supplies[1].supply = "vddl";
1062
1063         ret = devm_regulator_bulk_get(&client->dev,
1064                                       ARRAY_SIZE(ihid->pdata.supplies),
1065                                       ihid->pdata.supplies);
1066         if (ret)
1067                 return ret;
1068
1069         ret = regulator_bulk_enable(ARRAY_SIZE(ihid->pdata.supplies),
1070                                     ihid->pdata.supplies);
1071         if (ret < 0)
1072                 return ret;
1073
1074         if (ihid->pdata.post_power_delay_ms)
1075                 msleep(ihid->pdata.post_power_delay_ms);
1076
1077         i2c_set_clientdata(client, ihid);
1078
1079         ihid->client = client;
1080
1081         hidRegister = ihid->pdata.hid_descriptor_address;
1082         ihid->wHIDDescRegister = cpu_to_le16(hidRegister);
1083
1084         init_waitqueue_head(&ihid->wait);
1085         mutex_init(&ihid->reset_lock);
1086
1087         /* we need to allocate the command buffer without knowing the maximum
1088          * size of the reports. Let's use HID_MIN_BUFFER_SIZE, then we do the
1089          * real computation later. */
1090         ret = i2c_hid_alloc_buffers(ihid, HID_MIN_BUFFER_SIZE);
1091         if (ret < 0)
1092                 goto err_regulator;
1093
1094         i2c_hid_acpi_fix_up_power(&client->dev);
1095
1096         pm_runtime_get_noresume(&client->dev);
1097         pm_runtime_set_active(&client->dev);
1098         pm_runtime_enable(&client->dev);
1099         device_enable_async_suspend(&client->dev);
1100
1101         /* Make sure there is something at this address */
1102         ret = i2c_smbus_read_byte(client);
1103         if (ret < 0) {
1104                 dev_dbg(&client->dev, "nothing at this address: %d\n", ret);
1105                 ret = -ENXIO;
1106                 goto err_pm;
1107         }
1108
1109         ret = i2c_hid_fetch_hid_descriptor(ihid);
1110         if (ret < 0)
1111                 goto err_pm;
1112
1113         ret = i2c_hid_init_irq(client);
1114         if (ret < 0)
1115                 goto err_pm;
1116
1117         hid = hid_allocate_device();
1118         if (IS_ERR(hid)) {
1119                 ret = PTR_ERR(hid);
1120                 goto err_irq;
1121         }
1122
1123         ihid->hid = hid;
1124
1125         hid->driver_data = client;
1126         hid->ll_driver = &i2c_hid_ll_driver;
1127         hid->dev.parent = &client->dev;
1128         hid->bus = BUS_I2C;
1129         hid->version = le16_to_cpu(ihid->hdesc.bcdVersion);
1130         hid->vendor = le16_to_cpu(ihid->hdesc.wVendorID);
1131         hid->product = le16_to_cpu(ihid->hdesc.wProductID);
1132
1133         snprintf(hid->name, sizeof(hid->name), "%s %04hX:%04hX",
1134                  client->name, hid->vendor, hid->product);
1135         strlcpy(hid->phys, dev_name(&client->dev), sizeof(hid->phys));
1136
1137         ihid->quirks = i2c_hid_lookup_quirk(hid->vendor, hid->product);
1138
1139         ret = hid_add_device(hid);
1140         if (ret) {
1141                 if (ret != -ENODEV)
1142                         hid_err(client, "can't add hid device: %d\n", ret);
1143                 goto err_mem_free;
1144         }
1145
1146         if (!(ihid->quirks & I2C_HID_QUIRK_NO_RUNTIME_PM))
1147                 pm_runtime_put(&client->dev);
1148
1149         return 0;
1150
1151 err_mem_free:
1152         hid_destroy_device(hid);
1153
1154 err_irq:
1155         free_irq(client->irq, ihid);
1156
1157 err_pm:
1158         pm_runtime_put_noidle(&client->dev);
1159         pm_runtime_disable(&client->dev);
1160
1161 err_regulator:
1162         regulator_bulk_disable(ARRAY_SIZE(ihid->pdata.supplies),
1163                                ihid->pdata.supplies);
1164         i2c_hid_free_buffers(ihid);
1165         return ret;
1166 }
1167
1168 static int i2c_hid_remove(struct i2c_client *client)
1169 {
1170         struct i2c_hid *ihid = i2c_get_clientdata(client);
1171         struct hid_device *hid;
1172
1173         if (!(ihid->quirks & I2C_HID_QUIRK_NO_RUNTIME_PM))
1174                 pm_runtime_get_sync(&client->dev);
1175         pm_runtime_disable(&client->dev);
1176         pm_runtime_set_suspended(&client->dev);
1177         pm_runtime_put_noidle(&client->dev);
1178
1179         hid = ihid->hid;
1180         hid_destroy_device(hid);
1181
1182         free_irq(client->irq, ihid);
1183
1184         if (ihid->bufsize)
1185                 i2c_hid_free_buffers(ihid);
1186
1187         regulator_bulk_disable(ARRAY_SIZE(ihid->pdata.supplies),
1188                                ihid->pdata.supplies);
1189
1190         return 0;
1191 }
1192
1193 static void i2c_hid_shutdown(struct i2c_client *client)
1194 {
1195         struct i2c_hid *ihid = i2c_get_clientdata(client);
1196
1197         i2c_hid_set_power(client, I2C_HID_PWR_SLEEP);
1198         free_irq(client->irq, ihid);
1199 }
1200
1201 #ifdef CONFIG_PM_SLEEP
1202 static int i2c_hid_suspend(struct device *dev)
1203 {
1204         struct i2c_client *client = to_i2c_client(dev);
1205         struct i2c_hid *ihid = i2c_get_clientdata(client);
1206         struct hid_device *hid = ihid->hid;
1207         int ret;
1208         int wake_status;
1209
1210         if (hid->driver && hid->driver->suspend) {
1211                 /*
1212                  * Wake up the device so that IO issues in
1213                  * HID driver's suspend code can succeed.
1214                  */
1215                 ret = pm_runtime_resume(dev);
1216                 if (ret < 0)
1217                         return ret;
1218
1219                 ret = hid->driver->suspend(hid, PMSG_SUSPEND);
1220                 if (ret < 0)
1221                         return ret;
1222         }
1223
1224         if (!pm_runtime_suspended(dev)) {
1225                 /* Save some power */
1226                 i2c_hid_set_power(client, I2C_HID_PWR_SLEEP);
1227
1228                 disable_irq(client->irq);
1229         }
1230
1231         if (device_may_wakeup(&client->dev)) {
1232                 wake_status = enable_irq_wake(client->irq);
1233                 if (!wake_status)
1234                         ihid->irq_wake_enabled = true;
1235                 else
1236                         hid_warn(hid, "Failed to enable irq wake: %d\n",
1237                                 wake_status);
1238         } else {
1239                 regulator_bulk_disable(ARRAY_SIZE(ihid->pdata.supplies),
1240                                        ihid->pdata.supplies);
1241         }
1242
1243         return 0;
1244 }
1245
1246 static int i2c_hid_resume(struct device *dev)
1247 {
1248         int ret;
1249         struct i2c_client *client = to_i2c_client(dev);
1250         struct i2c_hid *ihid = i2c_get_clientdata(client);
1251         struct hid_device *hid = ihid->hid;
1252         int wake_status;
1253
1254         if (!device_may_wakeup(&client->dev)) {
1255                 ret = regulator_bulk_enable(ARRAY_SIZE(ihid->pdata.supplies),
1256                                             ihid->pdata.supplies);
1257                 if (ret)
1258                         hid_warn(hid, "Failed to enable supplies: %d\n", ret);
1259
1260                 if (ihid->pdata.post_power_delay_ms)
1261                         msleep(ihid->pdata.post_power_delay_ms);
1262         } else if (ihid->irq_wake_enabled) {
1263                 wake_status = disable_irq_wake(client->irq);
1264                 if (!wake_status)
1265                         ihid->irq_wake_enabled = false;
1266                 else
1267                         hid_warn(hid, "Failed to disable irq wake: %d\n",
1268                                 wake_status);
1269         }
1270
1271         /* We'll resume to full power */
1272         pm_runtime_disable(dev);
1273         pm_runtime_set_active(dev);
1274         pm_runtime_enable(dev);
1275
1276         enable_irq(client->irq);
1277
1278         /* Instead of resetting device, simply powers the device on. This
1279          * solves "incomplete reports" on Raydium devices 2386:3118 and
1280          * 2386:4B33 and fixes various SIS touchscreens no longer sending
1281          * data after a suspend/resume.
1282          */
1283         ret = i2c_hid_set_power(client, I2C_HID_PWR_ON);
1284         if (ret)
1285                 return ret;
1286
1287         if (hid->driver && hid->driver->reset_resume) {
1288                 ret = hid->driver->reset_resume(hid);
1289                 return ret;
1290         }
1291
1292         return 0;
1293 }
1294 #endif
1295
1296 #ifdef CONFIG_PM
1297 static int i2c_hid_runtime_suspend(struct device *dev)
1298 {
1299         struct i2c_client *client = to_i2c_client(dev);
1300
1301         i2c_hid_set_power(client, I2C_HID_PWR_SLEEP);
1302         disable_irq(client->irq);
1303         return 0;
1304 }
1305
1306 static int i2c_hid_runtime_resume(struct device *dev)
1307 {
1308         struct i2c_client *client = to_i2c_client(dev);
1309
1310         enable_irq(client->irq);
1311         i2c_hid_set_power(client, I2C_HID_PWR_ON);
1312         return 0;
1313 }
1314 #endif
1315
1316 static const struct dev_pm_ops i2c_hid_pm = {
1317         SET_SYSTEM_SLEEP_PM_OPS(i2c_hid_suspend, i2c_hid_resume)
1318         SET_RUNTIME_PM_OPS(i2c_hid_runtime_suspend, i2c_hid_runtime_resume,
1319                            NULL)
1320 };
1321
1322 static const struct i2c_device_id i2c_hid_id_table[] = {
1323         { "hid", 0 },
1324         { "hid-over-i2c", 0 },
1325         { },
1326 };
1327 MODULE_DEVICE_TABLE(i2c, i2c_hid_id_table);
1328
1329
1330 static struct i2c_driver i2c_hid_driver = {
1331         .driver = {
1332                 .name   = "i2c_hid",
1333                 .pm     = &i2c_hid_pm,
1334                 .acpi_match_table = ACPI_PTR(i2c_hid_acpi_match),
1335                 .of_match_table = of_match_ptr(i2c_hid_of_match),
1336         },
1337
1338         .probe          = i2c_hid_probe,
1339         .remove         = i2c_hid_remove,
1340         .shutdown       = i2c_hid_shutdown,
1341         .id_table       = i2c_hid_id_table,
1342 };
1343
1344 module_i2c_driver(i2c_hid_driver);
1345
1346 MODULE_DESCRIPTION("HID over I2C core driver");
1347 MODULE_AUTHOR("Benjamin Tissoires <benjamin.tissoires@gmail.com>");
1348 MODULE_LICENSE("GPL");