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_wakeirq.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 <asm/unaligned.h>
40
41 #include <drm/drm_panel.h>
42
43 #include "../hid-ids.h"
44 #include "i2c-hid.h"
45
46 /* quirks to control the device */
47 #define I2C_HID_QUIRK_SET_PWR_WAKEUP_DEV BIT(0)
48 #define I2C_HID_QUIRK_NO_IRQ_AFTER_RESET BIT(1)
49 #define I2C_HID_QUIRK_BOGUS_IRQ BIT(4)
50 #define I2C_HID_QUIRK_RESET_ON_RESUME BIT(5)
51 #define I2C_HID_QUIRK_BAD_INPUT_SIZE BIT(6)
52 #define I2C_HID_QUIRK_NO_WAKEUP_AFTER_RESET BIT(7)
53
54 /* Command opcodes */
55 #define I2C_HID_OPCODE_RESET 0x01
56 #define I2C_HID_OPCODE_GET_REPORT 0x02
57 #define I2C_HID_OPCODE_SET_REPORT 0x03
58 #define I2C_HID_OPCODE_GET_IDLE 0x04
59 #define I2C_HID_OPCODE_SET_IDLE 0x05
60 #define I2C_HID_OPCODE_GET_PROTOCOL 0x06
61 #define I2C_HID_OPCODE_SET_PROTOCOL 0x07
62 #define I2C_HID_OPCODE_SET_POWER 0x08
63
64 /* flags */
65 #define I2C_HID_STARTED 0
66 #define I2C_HID_RESET_PENDING 1
67
68 #define I2C_HID_PWR_ON 0x00
69 #define I2C_HID_PWR_SLEEP 0x01
70
71 #define i2c_hid_dbg(ihid, ...) dev_dbg(&(ihid)->client->dev, __VA_ARGS__)
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 /* The main device structure */
91 struct i2c_hid {
92 struct i2c_client *client; /* i2c client */
93 struct hid_device *hid; /* pointer to corresponding HID dev */
94 struct i2c_hid_desc hdesc; /* the HID Descriptor */
95 __le16 wHIDDescRegister; /* location of the i2c
96 * register of the HID
97 * descriptor. */
98 unsigned int bufsize; /* i2c buffer size */
99 u8 *inbuf; /* Input buffer */
100 u8 *rawbuf; /* Raw Input buffer */
101 u8 *cmdbuf; /* Command buffer */
102
103 unsigned long flags; /* device flags */
104 unsigned long quirks; /* Various quirks */
105
106 wait_queue_head_t wait; /* For waiting the interrupt */
107
108 struct mutex reset_lock;
109
110 struct i2chid_ops *ops;
111 struct drm_panel_follower panel_follower;
112 struct work_struct panel_follower_prepare_work;
113 bool is_panel_follower;
114 bool prepare_work_finished;
115 };
116
117 static const struct i2c_hid_quirks {
118 __u16 idVendor;
119 __u16 idProduct;
120 __u32 quirks;
121 } i2c_hid_quirks[] = {
122 { USB_VENDOR_ID_WEIDA, HID_ANY_ID,
123 I2C_HID_QUIRK_SET_PWR_WAKEUP_DEV },
124 { I2C_VENDOR_ID_HANTICK, I2C_PRODUCT_ID_HANTICK_5288,
125 I2C_HID_QUIRK_NO_IRQ_AFTER_RESET },
126 { I2C_VENDOR_ID_ITE, I2C_DEVICE_ID_ITE_VOYO_WINPAD_A15,
127 I2C_HID_QUIRK_NO_IRQ_AFTER_RESET },
128 { I2C_VENDOR_ID_RAYDIUM, I2C_PRODUCT_ID_RAYDIUM_3118,
129 I2C_HID_QUIRK_NO_IRQ_AFTER_RESET },
130 { USB_VENDOR_ID_ALPS_JP, HID_ANY_ID,
131 I2C_HID_QUIRK_RESET_ON_RESUME },
132 { I2C_VENDOR_ID_SYNAPTICS, I2C_PRODUCT_ID_SYNAPTICS_SYNA2393,
133 I2C_HID_QUIRK_RESET_ON_RESUME },
134 { USB_VENDOR_ID_ITE, I2C_DEVICE_ID_ITE_LENOVO_LEGION_Y720,
135 I2C_HID_QUIRK_BAD_INPUT_SIZE },
136 /*
137 * Sending the wakeup after reset actually break ELAN touchscreen controller
138 */
139 { USB_VENDOR_ID_ELAN, HID_ANY_ID,
140 I2C_HID_QUIRK_NO_WAKEUP_AFTER_RESET |
141 I2C_HID_QUIRK_BOGUS_IRQ },
142 { 0, 0 }
143 };
144
145 /*
146 * i2c_hid_lookup_quirk: return any quirks associated with a I2C HID device
147 * @idVendor: the 16-bit vendor ID
148 * @idProduct: the 16-bit product ID
149 *
150 * Returns: a u32 quirks value.
151 */
i2c_hid_lookup_quirk(const u16 idVendor,const u16 idProduct)152 static u32 i2c_hid_lookup_quirk(const u16 idVendor, const u16 idProduct)
153 {
154 u32 quirks = 0;
155 int n;
156
157 for (n = 0; i2c_hid_quirks[n].idVendor; n++)
158 if (i2c_hid_quirks[n].idVendor == idVendor &&
159 (i2c_hid_quirks[n].idProduct == (__u16)HID_ANY_ID ||
160 i2c_hid_quirks[n].idProduct == idProduct))
161 quirks = i2c_hid_quirks[n].quirks;
162
163 return quirks;
164 }
165
i2c_hid_xfer(struct i2c_hid * ihid,u8 * send_buf,int send_len,u8 * recv_buf,int recv_len)166 static int i2c_hid_xfer(struct i2c_hid *ihid,
167 u8 *send_buf, int send_len, u8 *recv_buf, int recv_len)
168 {
169 struct i2c_client *client = ihid->client;
170 struct i2c_msg msgs[2] = { 0 };
171 int n = 0;
172 int ret;
173
174 if (send_len) {
175 i2c_hid_dbg(ihid, "%s: cmd=%*ph\n",
176 __func__, send_len, send_buf);
177
178 msgs[n].addr = client->addr;
179 msgs[n].flags = (client->flags & I2C_M_TEN) | I2C_M_DMA_SAFE;
180 msgs[n].len = send_len;
181 msgs[n].buf = send_buf;
182 n++;
183 }
184
185 if (recv_len) {
186 msgs[n].addr = client->addr;
187 msgs[n].flags = (client->flags & I2C_M_TEN) |
188 I2C_M_RD | I2C_M_DMA_SAFE;
189 msgs[n].len = recv_len;
190 msgs[n].buf = recv_buf;
191 n++;
192 }
193
194 ret = i2c_transfer(client->adapter, msgs, n);
195
196 if (ret != n)
197 return ret < 0 ? ret : -EIO;
198
199 return 0;
200 }
201
i2c_hid_read_register(struct i2c_hid * ihid,__le16 reg,void * buf,size_t len)202 static int i2c_hid_read_register(struct i2c_hid *ihid, __le16 reg,
203 void *buf, size_t len)
204 {
205 *(__le16 *)ihid->cmdbuf = reg;
206
207 return i2c_hid_xfer(ihid, ihid->cmdbuf, sizeof(__le16), buf, len);
208 }
209
i2c_hid_encode_command(u8 * buf,u8 opcode,int report_type,int report_id)210 static size_t i2c_hid_encode_command(u8 *buf, u8 opcode,
211 int report_type, int report_id)
212 {
213 size_t length = 0;
214
215 if (report_id < 0x0F) {
216 buf[length++] = report_type << 4 | report_id;
217 buf[length++] = opcode;
218 } else {
219 buf[length++] = report_type << 4 | 0x0F;
220 buf[length++] = opcode;
221 buf[length++] = report_id;
222 }
223
224 return length;
225 }
226
i2c_hid_get_report(struct i2c_hid * ihid,u8 report_type,u8 report_id,u8 * recv_buf,size_t recv_len)227 static int i2c_hid_get_report(struct i2c_hid *ihid,
228 u8 report_type, u8 report_id,
229 u8 *recv_buf, size_t recv_len)
230 {
231 size_t length = 0;
232 size_t ret_count;
233 int error;
234
235 i2c_hid_dbg(ihid, "%s\n", __func__);
236
237 /* Command register goes first */
238 *(__le16 *)ihid->cmdbuf = ihid->hdesc.wCommandRegister;
239 length += sizeof(__le16);
240 /* Next is GET_REPORT command */
241 length += i2c_hid_encode_command(ihid->cmdbuf + length,
242 I2C_HID_OPCODE_GET_REPORT,
243 report_type, report_id);
244 /*
245 * Device will send report data through data register. Because
246 * command can be either 2 or 3 bytes destination for the data
247 * register may be not aligned.
248 */
249 put_unaligned_le16(le16_to_cpu(ihid->hdesc.wDataRegister),
250 ihid->cmdbuf + length);
251 length += sizeof(__le16);
252
253 /*
254 * In addition to report data device will supply data length
255 * in the first 2 bytes of the response, so adjust .
256 */
257 error = i2c_hid_xfer(ihid, ihid->cmdbuf, length,
258 ihid->rawbuf, recv_len + sizeof(__le16));
259 if (error) {
260 dev_err(&ihid->client->dev,
261 "failed to set a report to device: %d\n", error);
262 return error;
263 }
264
265 /* The buffer is sufficiently aligned */
266 ret_count = le16_to_cpup((__le16 *)ihid->rawbuf);
267
268 /* Check for empty report response */
269 if (ret_count <= sizeof(__le16))
270 return 0;
271
272 recv_len = min(recv_len, ret_count - sizeof(__le16));
273 memcpy(recv_buf, ihid->rawbuf + sizeof(__le16), recv_len);
274
275 if (report_id && recv_len != 0 && recv_buf[0] != report_id) {
276 dev_err(&ihid->client->dev,
277 "device returned incorrect report (%d vs %d expected)\n",
278 recv_buf[0], report_id);
279 return -EINVAL;
280 }
281
282 return recv_len;
283 }
284
i2c_hid_format_report(u8 * buf,int report_id,const u8 * data,size_t size)285 static size_t i2c_hid_format_report(u8 *buf, int report_id,
286 const u8 *data, size_t size)
287 {
288 size_t length = sizeof(__le16); /* reserve space to store size */
289
290 if (report_id)
291 buf[length++] = report_id;
292
293 memcpy(buf + length, data, size);
294 length += size;
295
296 /* Store overall size in the beginning of the buffer */
297 put_unaligned_le16(length, buf);
298
299 return length;
300 }
301
302 /**
303 * i2c_hid_set_or_send_report: forward an incoming report to the device
304 * @ihid: the i2c hid device
305 * @report_type: 0x03 for HID_FEATURE_REPORT ; 0x02 for HID_OUTPUT_REPORT
306 * @report_id: the report ID
307 * @buf: the actual data to transfer, without the report ID
308 * @data_len: size of buf
309 * @do_set: true: use SET_REPORT HID command, false: send plain OUTPUT report
310 */
i2c_hid_set_or_send_report(struct i2c_hid * ihid,u8 report_type,u8 report_id,const u8 * buf,size_t data_len,bool do_set)311 static int i2c_hid_set_or_send_report(struct i2c_hid *ihid,
312 u8 report_type, u8 report_id,
313 const u8 *buf, size_t data_len,
314 bool do_set)
315 {
316 size_t length = 0;
317 int error;
318
319 i2c_hid_dbg(ihid, "%s\n", __func__);
320
321 if (data_len > ihid->bufsize)
322 return -EINVAL;
323
324 if (!do_set && le16_to_cpu(ihid->hdesc.wMaxOutputLength) == 0)
325 return -ENOSYS;
326
327 if (do_set) {
328 /* Command register goes first */
329 *(__le16 *)ihid->cmdbuf = ihid->hdesc.wCommandRegister;
330 length += sizeof(__le16);
331 /* Next is SET_REPORT command */
332 length += i2c_hid_encode_command(ihid->cmdbuf + length,
333 I2C_HID_OPCODE_SET_REPORT,
334 report_type, report_id);
335 /*
336 * Report data will go into the data register. Because
337 * command can be either 2 or 3 bytes destination for
338 * the data register may be not aligned.
339 */
340 put_unaligned_le16(le16_to_cpu(ihid->hdesc.wDataRegister),
341 ihid->cmdbuf + length);
342 length += sizeof(__le16);
343 } else {
344 /*
345 * With simple "send report" all data goes into the output
346 * register.
347 */
348 *(__le16 *)ihid->cmdbuf = ihid->hdesc.wOutputRegister;
349 length += sizeof(__le16);
350 }
351
352 length += i2c_hid_format_report(ihid->cmdbuf + length,
353 report_id, buf, data_len);
354
355 error = i2c_hid_xfer(ihid, ihid->cmdbuf, length, NULL, 0);
356 if (error) {
357 dev_err(&ihid->client->dev,
358 "failed to set a report to device: %d\n", error);
359 return error;
360 }
361
362 return data_len;
363 }
364
i2c_hid_set_power_command(struct i2c_hid * ihid,int power_state)365 static int i2c_hid_set_power_command(struct i2c_hid *ihid, int power_state)
366 {
367 size_t length;
368
369 /* SET_POWER uses command register */
370 *(__le16 *)ihid->cmdbuf = ihid->hdesc.wCommandRegister;
371 length = sizeof(__le16);
372
373 /* Now the command itself */
374 length += i2c_hid_encode_command(ihid->cmdbuf + length,
375 I2C_HID_OPCODE_SET_POWER,
376 0, power_state);
377
378 return i2c_hid_xfer(ihid, ihid->cmdbuf, length, NULL, 0);
379 }
380
i2c_hid_set_power(struct i2c_hid * ihid,int power_state)381 static int i2c_hid_set_power(struct i2c_hid *ihid, int power_state)
382 {
383 int ret;
384
385 i2c_hid_dbg(ihid, "%s\n", __func__);
386
387 /*
388 * Some devices require to send a command to wakeup before power on.
389 * The call will get a return value (EREMOTEIO) but device will be
390 * triggered and activated. After that, it goes like a normal device.
391 */
392 if (power_state == I2C_HID_PWR_ON &&
393 ihid->quirks & I2C_HID_QUIRK_SET_PWR_WAKEUP_DEV) {
394 ret = i2c_hid_set_power_command(ihid, I2C_HID_PWR_ON);
395
396 /* Device was already activated */
397 if (!ret)
398 goto set_pwr_exit;
399 }
400
401 ret = i2c_hid_set_power_command(ihid, power_state);
402 if (ret)
403 dev_err(&ihid->client->dev,
404 "failed to change power setting.\n");
405
406 set_pwr_exit:
407
408 /*
409 * The HID over I2C specification states that if a DEVICE needs time
410 * after the PWR_ON request, it should utilise CLOCK stretching.
411 * However, it has been observered that the Windows driver provides a
412 * 1ms sleep between the PWR_ON and RESET requests.
413 * According to Goodix Windows even waits 60 ms after (other?)
414 * PWR_ON requests. Testing has confirmed that several devices
415 * will not work properly without a delay after a PWR_ON request.
416 */
417 if (!ret && power_state == I2C_HID_PWR_ON)
418 msleep(60);
419
420 return ret;
421 }
422
i2c_hid_execute_reset(struct i2c_hid * ihid)423 static int i2c_hid_execute_reset(struct i2c_hid *ihid)
424 {
425 size_t length = 0;
426 int ret;
427
428 i2c_hid_dbg(ihid, "resetting...\n");
429
430 /* Prepare reset command. Command register goes first. */
431 *(__le16 *)ihid->cmdbuf = ihid->hdesc.wCommandRegister;
432 length += sizeof(__le16);
433 /* Next is RESET command itself */
434 length += i2c_hid_encode_command(ihid->cmdbuf + length,
435 I2C_HID_OPCODE_RESET, 0, 0);
436
437 set_bit(I2C_HID_RESET_PENDING, &ihid->flags);
438
439 ret = i2c_hid_xfer(ihid, ihid->cmdbuf, length, NULL, 0);
440 if (ret) {
441 dev_err(&ihid->client->dev, "failed to reset device.\n");
442 goto out;
443 }
444
445 if (ihid->quirks & I2C_HID_QUIRK_NO_IRQ_AFTER_RESET) {
446 msleep(100);
447 goto out;
448 }
449
450 i2c_hid_dbg(ihid, "%s: waiting...\n", __func__);
451 if (!wait_event_timeout(ihid->wait,
452 !test_bit(I2C_HID_RESET_PENDING, &ihid->flags),
453 msecs_to_jiffies(5000))) {
454 ret = -ENODATA;
455 goto out;
456 }
457 i2c_hid_dbg(ihid, "%s: finished.\n", __func__);
458
459 out:
460 clear_bit(I2C_HID_RESET_PENDING, &ihid->flags);
461 return ret;
462 }
463
i2c_hid_hwreset(struct i2c_hid * ihid)464 static int i2c_hid_hwreset(struct i2c_hid *ihid)
465 {
466 int ret;
467
468 i2c_hid_dbg(ihid, "%s\n", __func__);
469
470 /*
471 * This prevents sending feature reports while the device is
472 * being reset. Otherwise we may lose the reset complete
473 * interrupt.
474 */
475 mutex_lock(&ihid->reset_lock);
476
477 ret = i2c_hid_set_power(ihid, I2C_HID_PWR_ON);
478 if (ret)
479 goto out_unlock;
480
481 ret = i2c_hid_execute_reset(ihid);
482 if (ret) {
483 dev_err(&ihid->client->dev,
484 "failed to reset device: %d\n", ret);
485 i2c_hid_set_power(ihid, I2C_HID_PWR_SLEEP);
486 goto out_unlock;
487 }
488
489 /* At least some SIS devices need this after reset */
490 if (!(ihid->quirks & I2C_HID_QUIRK_NO_WAKEUP_AFTER_RESET))
491 ret = i2c_hid_set_power(ihid, I2C_HID_PWR_ON);
492
493 out_unlock:
494 mutex_unlock(&ihid->reset_lock);
495 return ret;
496 }
497
i2c_hid_get_input(struct i2c_hid * ihid)498 static void i2c_hid_get_input(struct i2c_hid *ihid)
499 {
500 u16 size = le16_to_cpu(ihid->hdesc.wMaxInputLength);
501 u16 ret_size;
502 int ret;
503
504 if (size > ihid->bufsize)
505 size = ihid->bufsize;
506
507 ret = i2c_master_recv(ihid->client, ihid->inbuf, size);
508 if (ret != size) {
509 if (ret < 0)
510 return;
511
512 dev_err(&ihid->client->dev, "%s: got %d data instead of %d\n",
513 __func__, ret, size);
514 return;
515 }
516
517 /* Receiving buffer is properly aligned */
518 ret_size = le16_to_cpup((__le16 *)ihid->inbuf);
519 if (!ret_size) {
520 /* host or device initiated RESET completed */
521 if (test_and_clear_bit(I2C_HID_RESET_PENDING, &ihid->flags))
522 wake_up(&ihid->wait);
523 return;
524 }
525
526 if ((ihid->quirks & I2C_HID_QUIRK_BOGUS_IRQ) && ret_size == 0xffff) {
527 dev_warn_once(&ihid->client->dev,
528 "%s: IRQ triggered but there's no data\n",
529 __func__);
530 return;
531 }
532
533 if (ret_size > size || ret_size < sizeof(__le16)) {
534 if (ihid->quirks & I2C_HID_QUIRK_BAD_INPUT_SIZE) {
535 *(__le16 *)ihid->inbuf = cpu_to_le16(size);
536 ret_size = size;
537 } else {
538 dev_err(&ihid->client->dev,
539 "%s: incomplete report (%d/%d)\n",
540 __func__, size, ret_size);
541 return;
542 }
543 }
544
545 i2c_hid_dbg(ihid, "input: %*ph\n", ret_size, ihid->inbuf);
546
547 if (test_bit(I2C_HID_STARTED, &ihid->flags)) {
548 if (ihid->hid->group != HID_GROUP_RMI)
549 pm_wakeup_event(&ihid->client->dev, 0);
550
551 hid_input_report(ihid->hid, HID_INPUT_REPORT,
552 ihid->inbuf + sizeof(__le16),
553 ret_size - sizeof(__le16), 1);
554 }
555
556 return;
557 }
558
i2c_hid_irq(int irq,void * dev_id)559 static irqreturn_t i2c_hid_irq(int irq, void *dev_id)
560 {
561 struct i2c_hid *ihid = dev_id;
562
563 i2c_hid_get_input(ihid);
564
565 return IRQ_HANDLED;
566 }
567
i2c_hid_get_report_length(struct hid_report * report)568 static int i2c_hid_get_report_length(struct hid_report *report)
569 {
570 return ((report->size - 1) >> 3) + 1 +
571 report->device->report_enum[report->type].numbered + 2;
572 }
573
574 /*
575 * Traverse the supplied list of reports and find the longest
576 */
i2c_hid_find_max_report(struct hid_device * hid,unsigned int type,unsigned int * max)577 static void i2c_hid_find_max_report(struct hid_device *hid, unsigned int type,
578 unsigned int *max)
579 {
580 struct hid_report *report;
581 unsigned int size;
582
583 /* We should not rely on wMaxInputLength, as some devices may set it to
584 * a wrong length. */
585 list_for_each_entry(report, &hid->report_enum[type].report_list, list) {
586 size = i2c_hid_get_report_length(report);
587 if (*max < size)
588 *max = size;
589 }
590 }
591
i2c_hid_free_buffers(struct i2c_hid * ihid)592 static void i2c_hid_free_buffers(struct i2c_hid *ihid)
593 {
594 kfree(ihid->inbuf);
595 kfree(ihid->rawbuf);
596 kfree(ihid->cmdbuf);
597 ihid->inbuf = NULL;
598 ihid->rawbuf = NULL;
599 ihid->cmdbuf = NULL;
600 ihid->bufsize = 0;
601 }
602
i2c_hid_alloc_buffers(struct i2c_hid * ihid,size_t report_size)603 static int i2c_hid_alloc_buffers(struct i2c_hid *ihid, size_t report_size)
604 {
605 /*
606 * The worst case is computed from the set_report command with a
607 * reportID > 15 and the maximum report length.
608 */
609 int cmd_len = sizeof(__le16) + /* command register */
610 sizeof(u8) + /* encoded report type/ID */
611 sizeof(u8) + /* opcode */
612 sizeof(u8) + /* optional 3rd byte report ID */
613 sizeof(__le16) + /* data register */
614 sizeof(__le16) + /* report data size */
615 sizeof(u8) + /* report ID if numbered report */
616 report_size;
617
618 ihid->inbuf = kzalloc(report_size, GFP_KERNEL);
619 ihid->rawbuf = kzalloc(report_size, GFP_KERNEL);
620 ihid->cmdbuf = kzalloc(cmd_len, GFP_KERNEL);
621
622 if (!ihid->inbuf || !ihid->rawbuf || !ihid->cmdbuf) {
623 i2c_hid_free_buffers(ihid);
624 return -ENOMEM;
625 }
626
627 ihid->bufsize = report_size;
628
629 return 0;
630 }
631
i2c_hid_get_raw_report(struct hid_device * hid,u8 report_type,u8 report_id,u8 * buf,size_t count)632 static int i2c_hid_get_raw_report(struct hid_device *hid,
633 u8 report_type, u8 report_id,
634 u8 *buf, size_t count)
635 {
636 struct i2c_client *client = hid->driver_data;
637 struct i2c_hid *ihid = i2c_get_clientdata(client);
638 int ret_count;
639
640 if (report_type == HID_OUTPUT_REPORT)
641 return -EINVAL;
642
643 /*
644 * In case of unnumbered reports the response from the device will
645 * not have the report ID that the upper layers expect, so we need
646 * to stash it the buffer ourselves and adjust the data size.
647 */
648 if (!report_id) {
649 buf[0] = 0;
650 buf++;
651 count--;
652 }
653
654 ret_count = i2c_hid_get_report(ihid,
655 report_type == HID_FEATURE_REPORT ? 0x03 : 0x01,
656 report_id, buf, count);
657
658 if (ret_count > 0 && !report_id)
659 ret_count++;
660
661 return ret_count;
662 }
663
i2c_hid_output_raw_report(struct hid_device * hid,u8 report_type,const u8 * buf,size_t count,bool do_set)664 static int i2c_hid_output_raw_report(struct hid_device *hid, u8 report_type,
665 const u8 *buf, size_t count, bool do_set)
666 {
667 struct i2c_client *client = hid->driver_data;
668 struct i2c_hid *ihid = i2c_get_clientdata(client);
669 int report_id = buf[0];
670 int ret;
671
672 if (report_type == HID_INPUT_REPORT)
673 return -EINVAL;
674
675 mutex_lock(&ihid->reset_lock);
676
677 /*
678 * Note that both numbered and unnumbered reports passed here
679 * are supposed to have report ID stored in the 1st byte of the
680 * buffer, so we strip it off unconditionally before passing payload
681 * to i2c_hid_set_or_send_report which takes care of encoding
682 * everything properly.
683 */
684 ret = i2c_hid_set_or_send_report(ihid,
685 report_type == HID_FEATURE_REPORT ? 0x03 : 0x02,
686 report_id, buf + 1, count - 1, do_set);
687
688 if (ret >= 0)
689 ret++; /* add report_id to the number of transferred bytes */
690
691 mutex_unlock(&ihid->reset_lock);
692
693 return ret;
694 }
695
i2c_hid_output_report(struct hid_device * hid,u8 * buf,size_t count)696 static int i2c_hid_output_report(struct hid_device *hid, u8 *buf, size_t count)
697 {
698 return i2c_hid_output_raw_report(hid, HID_OUTPUT_REPORT, buf, count,
699 false);
700 }
701
i2c_hid_raw_request(struct hid_device * hid,unsigned char reportnum,__u8 * buf,size_t len,unsigned char rtype,int reqtype)702 static int i2c_hid_raw_request(struct hid_device *hid, unsigned char reportnum,
703 __u8 *buf, size_t len, unsigned char rtype,
704 int reqtype)
705 {
706 switch (reqtype) {
707 case HID_REQ_GET_REPORT:
708 return i2c_hid_get_raw_report(hid, rtype, reportnum, buf, len);
709 case HID_REQ_SET_REPORT:
710 if (buf[0] != reportnum)
711 return -EINVAL;
712 return i2c_hid_output_raw_report(hid, rtype, buf, len, true);
713 default:
714 return -EIO;
715 }
716 }
717
i2c_hid_parse(struct hid_device * hid)718 static int i2c_hid_parse(struct hid_device *hid)
719 {
720 struct i2c_client *client = hid->driver_data;
721 struct i2c_hid *ihid = i2c_get_clientdata(client);
722 struct i2c_hid_desc *hdesc = &ihid->hdesc;
723 unsigned int rsize;
724 char *rdesc;
725 int ret;
726 int tries = 3;
727 char *use_override;
728
729 i2c_hid_dbg(ihid, "entering %s\n", __func__);
730
731 rsize = le16_to_cpu(hdesc->wReportDescLength);
732 if (!rsize || rsize > HID_MAX_DESCRIPTOR_SIZE) {
733 dbg_hid("weird size of report descriptor (%u)\n", rsize);
734 return -EINVAL;
735 }
736
737 do {
738 ret = i2c_hid_hwreset(ihid);
739 if (ret)
740 msleep(1000);
741 } while (tries-- > 0 && ret);
742
743 if (ret)
744 return ret;
745
746 use_override = i2c_hid_get_dmi_hid_report_desc_override(client->name,
747 &rsize);
748
749 if (use_override) {
750 rdesc = use_override;
751 i2c_hid_dbg(ihid, "Using a HID report descriptor override\n");
752 } else {
753 rdesc = kzalloc(rsize, GFP_KERNEL);
754
755 if (!rdesc) {
756 dbg_hid("couldn't allocate rdesc memory\n");
757 return -ENOMEM;
758 }
759
760 i2c_hid_dbg(ihid, "asking HID report descriptor\n");
761
762 ret = i2c_hid_read_register(ihid,
763 ihid->hdesc.wReportDescRegister,
764 rdesc, rsize);
765 if (ret) {
766 hid_err(hid, "reading report descriptor failed\n");
767 kfree(rdesc);
768 return -EIO;
769 }
770 }
771
772 i2c_hid_dbg(ihid, "Report Descriptor: %*ph\n", rsize, rdesc);
773
774 ret = hid_parse_report(hid, rdesc, rsize);
775 if (!use_override)
776 kfree(rdesc);
777
778 if (ret) {
779 dbg_hid("parsing report descriptor failed\n");
780 return ret;
781 }
782
783 return 0;
784 }
785
i2c_hid_start(struct hid_device * hid)786 static int i2c_hid_start(struct hid_device *hid)
787 {
788 struct i2c_client *client = hid->driver_data;
789 struct i2c_hid *ihid = i2c_get_clientdata(client);
790 int ret;
791 unsigned int bufsize = HID_MIN_BUFFER_SIZE;
792
793 i2c_hid_find_max_report(hid, HID_INPUT_REPORT, &bufsize);
794 i2c_hid_find_max_report(hid, HID_OUTPUT_REPORT, &bufsize);
795 i2c_hid_find_max_report(hid, HID_FEATURE_REPORT, &bufsize);
796
797 if (bufsize > ihid->bufsize) {
798 disable_irq(client->irq);
799 i2c_hid_free_buffers(ihid);
800
801 ret = i2c_hid_alloc_buffers(ihid, bufsize);
802 enable_irq(client->irq);
803
804 if (ret)
805 return ret;
806 }
807
808 return 0;
809 }
810
i2c_hid_stop(struct hid_device * hid)811 static void i2c_hid_stop(struct hid_device *hid)
812 {
813 hid->claimed = 0;
814 }
815
i2c_hid_open(struct hid_device * hid)816 static int i2c_hid_open(struct hid_device *hid)
817 {
818 struct i2c_client *client = hid->driver_data;
819 struct i2c_hid *ihid = i2c_get_clientdata(client);
820
821 set_bit(I2C_HID_STARTED, &ihid->flags);
822 return 0;
823 }
824
i2c_hid_close(struct hid_device * hid)825 static void i2c_hid_close(struct hid_device *hid)
826 {
827 struct i2c_client *client = hid->driver_data;
828 struct i2c_hid *ihid = i2c_get_clientdata(client);
829
830 clear_bit(I2C_HID_STARTED, &ihid->flags);
831 }
832
833 static const struct hid_ll_driver i2c_hid_ll_driver = {
834 .parse = i2c_hid_parse,
835 .start = i2c_hid_start,
836 .stop = i2c_hid_stop,
837 .open = i2c_hid_open,
838 .close = i2c_hid_close,
839 .output_report = i2c_hid_output_report,
840 .raw_request = i2c_hid_raw_request,
841 };
842
i2c_hid_init_irq(struct i2c_client * client)843 static int i2c_hid_init_irq(struct i2c_client *client)
844 {
845 struct i2c_hid *ihid = i2c_get_clientdata(client);
846 unsigned long irqflags = 0;
847 int ret;
848
849 i2c_hid_dbg(ihid, "Requesting IRQ: %d\n", client->irq);
850
851 if (!irq_get_trigger_type(client->irq))
852 irqflags = IRQF_TRIGGER_LOW;
853
854 ret = request_threaded_irq(client->irq, NULL, i2c_hid_irq,
855 irqflags | IRQF_ONESHOT | IRQF_NO_AUTOEN,
856 client->name, ihid);
857 if (ret < 0) {
858 dev_warn(&client->dev,
859 "Could not register for %s interrupt, irq = %d,"
860 " ret = %d\n",
861 client->name, client->irq, ret);
862
863 return ret;
864 }
865
866 return 0;
867 }
868
i2c_hid_fetch_hid_descriptor(struct i2c_hid * ihid)869 static int i2c_hid_fetch_hid_descriptor(struct i2c_hid *ihid)
870 {
871 struct i2c_client *client = ihid->client;
872 struct i2c_hid_desc *hdesc = &ihid->hdesc;
873 unsigned int dsize;
874 int error;
875
876 /* i2c hid fetch using a fixed descriptor size (30 bytes) */
877 if (i2c_hid_get_dmi_i2c_hid_desc_override(client->name)) {
878 i2c_hid_dbg(ihid, "Using a HID descriptor override\n");
879 ihid->hdesc =
880 *i2c_hid_get_dmi_i2c_hid_desc_override(client->name);
881 } else {
882 i2c_hid_dbg(ihid, "Fetching the HID descriptor\n");
883 error = i2c_hid_read_register(ihid,
884 ihid->wHIDDescRegister,
885 &ihid->hdesc,
886 sizeof(ihid->hdesc));
887 if (error) {
888 dev_err(&ihid->client->dev,
889 "failed to fetch HID descriptor: %d\n",
890 error);
891 return -ENODEV;
892 }
893 }
894
895 /* Validate the length of HID descriptor, the 4 first bytes:
896 * bytes 0-1 -> length
897 * bytes 2-3 -> bcdVersion (has to be 1.00) */
898 /* check bcdVersion == 1.0 */
899 if (le16_to_cpu(hdesc->bcdVersion) != 0x0100) {
900 dev_err(&ihid->client->dev,
901 "unexpected HID descriptor bcdVersion (0x%04hx)\n",
902 le16_to_cpu(hdesc->bcdVersion));
903 return -ENODEV;
904 }
905
906 /* Descriptor length should be 30 bytes as per the specification */
907 dsize = le16_to_cpu(hdesc->wHIDDescLength);
908 if (dsize != sizeof(struct i2c_hid_desc)) {
909 dev_err(&ihid->client->dev,
910 "weird size of HID descriptor (%u)\n", dsize);
911 return -ENODEV;
912 }
913 i2c_hid_dbg(ihid, "HID Descriptor: %*ph\n", dsize, &ihid->hdesc);
914 return 0;
915 }
916
i2c_hid_core_power_up(struct i2c_hid * ihid)917 static int i2c_hid_core_power_up(struct i2c_hid *ihid)
918 {
919 if (!ihid->ops->power_up)
920 return 0;
921
922 return ihid->ops->power_up(ihid->ops);
923 }
924
i2c_hid_core_power_down(struct i2c_hid * ihid)925 static void i2c_hid_core_power_down(struct i2c_hid *ihid)
926 {
927 if (!ihid->ops->power_down)
928 return;
929
930 ihid->ops->power_down(ihid->ops);
931 }
932
i2c_hid_core_shutdown_tail(struct i2c_hid * ihid)933 static void i2c_hid_core_shutdown_tail(struct i2c_hid *ihid)
934 {
935 if (!ihid->ops->shutdown_tail)
936 return;
937
938 ihid->ops->shutdown_tail(ihid->ops);
939 }
940
i2c_hid_core_suspend(struct i2c_hid * ihid,bool force_poweroff)941 static int i2c_hid_core_suspend(struct i2c_hid *ihid, bool force_poweroff)
942 {
943 struct i2c_client *client = ihid->client;
944 struct hid_device *hid = ihid->hid;
945 int ret;
946
947 ret = hid_driver_suspend(hid, PMSG_SUSPEND);
948 if (ret < 0)
949 return ret;
950
951 /* Save some power */
952 i2c_hid_set_power(ihid, I2C_HID_PWR_SLEEP);
953
954 disable_irq(client->irq);
955
956 if (force_poweroff || !device_may_wakeup(&client->dev))
957 i2c_hid_core_power_down(ihid);
958
959 return 0;
960 }
961
i2c_hid_core_resume(struct i2c_hid * ihid)962 static int i2c_hid_core_resume(struct i2c_hid *ihid)
963 {
964 struct i2c_client *client = ihid->client;
965 struct hid_device *hid = ihid->hid;
966 int ret;
967
968 if (!device_may_wakeup(&client->dev))
969 i2c_hid_core_power_up(ihid);
970
971 enable_irq(client->irq);
972
973 /* Instead of resetting device, simply powers the device on. This
974 * solves "incomplete reports" on Raydium devices 2386:3118 and
975 * 2386:4B33 and fixes various SIS touchscreens no longer sending
976 * data after a suspend/resume.
977 *
978 * However some ALPS touchpads generate IRQ storm without reset, so
979 * let's still reset them here.
980 */
981 if (ihid->quirks & I2C_HID_QUIRK_RESET_ON_RESUME)
982 ret = i2c_hid_hwreset(ihid);
983 else
984 ret = i2c_hid_set_power(ihid, I2C_HID_PWR_ON);
985
986 if (ret)
987 return ret;
988
989 return hid_driver_reset_resume(hid);
990 }
991
992 /*
993 * Check that the device exists and parse the HID descriptor.
994 */
__i2c_hid_core_probe(struct i2c_hid * ihid)995 static int __i2c_hid_core_probe(struct i2c_hid *ihid)
996 {
997 struct i2c_client *client = ihid->client;
998 struct hid_device *hid = ihid->hid;
999 int ret;
1000
1001 /* Make sure there is something at this address */
1002 ret = i2c_smbus_read_byte(client);
1003 if (ret < 0) {
1004 i2c_hid_dbg(ihid, "nothing at this address: %d\n", ret);
1005 return -ENXIO;
1006 }
1007
1008 ret = i2c_hid_fetch_hid_descriptor(ihid);
1009 if (ret < 0) {
1010 dev_err(&client->dev,
1011 "Failed to fetch the HID Descriptor\n");
1012 return ret;
1013 }
1014
1015 hid->version = le16_to_cpu(ihid->hdesc.bcdVersion);
1016 hid->vendor = le16_to_cpu(ihid->hdesc.wVendorID);
1017 hid->product = le16_to_cpu(ihid->hdesc.wProductID);
1018
1019 hid->initial_quirks |= i2c_hid_get_dmi_quirks(hid->vendor,
1020 hid->product);
1021
1022 snprintf(hid->name, sizeof(hid->name), "%s %04X:%04X",
1023 client->name, (u16)hid->vendor, (u16)hid->product);
1024 strscpy(hid->phys, dev_name(&client->dev), sizeof(hid->phys));
1025
1026 ihid->quirks = i2c_hid_lookup_quirk(hid->vendor, hid->product);
1027
1028 return 0;
1029 }
1030
i2c_hid_core_register_hid(struct i2c_hid * ihid)1031 static int i2c_hid_core_register_hid(struct i2c_hid *ihid)
1032 {
1033 struct i2c_client *client = ihid->client;
1034 struct hid_device *hid = ihid->hid;
1035 int ret;
1036
1037 enable_irq(client->irq);
1038
1039 ret = hid_add_device(hid);
1040 if (ret) {
1041 if (ret != -ENODEV)
1042 hid_err(client, "can't add hid device: %d\n", ret);
1043 disable_irq(client->irq);
1044 return ret;
1045 }
1046
1047 return 0;
1048 }
1049
i2c_hid_core_probe_panel_follower(struct i2c_hid * ihid)1050 static int i2c_hid_core_probe_panel_follower(struct i2c_hid *ihid)
1051 {
1052 int ret;
1053
1054 ret = i2c_hid_core_power_up(ihid);
1055 if (ret)
1056 return ret;
1057
1058 ret = __i2c_hid_core_probe(ihid);
1059 if (ret)
1060 goto err_power_down;
1061
1062 ret = i2c_hid_core_register_hid(ihid);
1063 if (ret)
1064 goto err_power_down;
1065
1066 return 0;
1067
1068 err_power_down:
1069 i2c_hid_core_power_down(ihid);
1070
1071 return ret;
1072 }
1073
ihid_core_panel_prepare_work(struct work_struct * work)1074 static void ihid_core_panel_prepare_work(struct work_struct *work)
1075 {
1076 struct i2c_hid *ihid = container_of(work, struct i2c_hid,
1077 panel_follower_prepare_work);
1078 struct hid_device *hid = ihid->hid;
1079 int ret;
1080
1081 /*
1082 * hid->version is set on the first power up. If it's still zero then
1083 * this is the first power on so we should perform initial power up
1084 * steps.
1085 */
1086 if (!hid->version)
1087 ret = i2c_hid_core_probe_panel_follower(ihid);
1088 else
1089 ret = i2c_hid_core_resume(ihid);
1090
1091 if (ret)
1092 dev_warn(&ihid->client->dev, "Power on failed: %d\n", ret);
1093 else
1094 WRITE_ONCE(ihid->prepare_work_finished, true);
1095
1096 /*
1097 * The work APIs provide a number of memory ordering guarantees
1098 * including one that says that memory writes before schedule_work()
1099 * are always visible to the work function, but they don't appear to
1100 * guarantee that a write that happened in the work is visible after
1101 * cancel_work_sync(). We'll add a write memory barrier here to match
1102 * with i2c_hid_core_panel_unpreparing() to ensure that our write to
1103 * prepare_work_finished is visible there.
1104 */
1105 smp_wmb();
1106 }
1107
i2c_hid_core_panel_prepared(struct drm_panel_follower * follower)1108 static int i2c_hid_core_panel_prepared(struct drm_panel_follower *follower)
1109 {
1110 struct i2c_hid *ihid = container_of(follower, struct i2c_hid, panel_follower);
1111
1112 /*
1113 * Powering on a touchscreen can be a slow process. Queue the work to
1114 * the system workqueue so we don't block the panel's power up.
1115 */
1116 WRITE_ONCE(ihid->prepare_work_finished, false);
1117 schedule_work(&ihid->panel_follower_prepare_work);
1118
1119 return 0;
1120 }
1121
i2c_hid_core_panel_unpreparing(struct drm_panel_follower * follower)1122 static int i2c_hid_core_panel_unpreparing(struct drm_panel_follower *follower)
1123 {
1124 struct i2c_hid *ihid = container_of(follower, struct i2c_hid, panel_follower);
1125
1126 cancel_work_sync(&ihid->panel_follower_prepare_work);
1127
1128 /* Match with ihid_core_panel_prepare_work() */
1129 smp_rmb();
1130 if (!READ_ONCE(ihid->prepare_work_finished))
1131 return 0;
1132
1133 return i2c_hid_core_suspend(ihid, true);
1134 }
1135
1136 static const struct drm_panel_follower_funcs i2c_hid_core_panel_follower_funcs = {
1137 .panel_prepared = i2c_hid_core_panel_prepared,
1138 .panel_unpreparing = i2c_hid_core_panel_unpreparing,
1139 };
1140
i2c_hid_core_register_panel_follower(struct i2c_hid * ihid)1141 static int i2c_hid_core_register_panel_follower(struct i2c_hid *ihid)
1142 {
1143 struct device *dev = &ihid->client->dev;
1144 int ret;
1145
1146 ihid->panel_follower.funcs = &i2c_hid_core_panel_follower_funcs;
1147
1148 /*
1149 * If we're not in control of our own power up/power down then we can't
1150 * do the logic to manage wakeups. Give a warning if a user thought
1151 * that was possible then force the capability off.
1152 */
1153 if (device_can_wakeup(dev)) {
1154 dev_warn(dev, "Can't wakeup if following panel\n");
1155 device_set_wakeup_capable(dev, false);
1156 }
1157
1158 ret = drm_panel_add_follower(dev, &ihid->panel_follower);
1159 if (ret)
1160 return ret;
1161
1162 return 0;
1163 }
1164
i2c_hid_core_probe(struct i2c_client * client,struct i2chid_ops * ops,u16 hid_descriptor_address,u32 quirks)1165 int i2c_hid_core_probe(struct i2c_client *client, struct i2chid_ops *ops,
1166 u16 hid_descriptor_address, u32 quirks)
1167 {
1168 int ret;
1169 struct i2c_hid *ihid;
1170 struct hid_device *hid;
1171
1172 dbg_hid("HID probe called for i2c 0x%02x\n", client->addr);
1173
1174 if (!client->irq) {
1175 dev_err(&client->dev,
1176 "HID over i2c has not been provided an Int IRQ\n");
1177 return -EINVAL;
1178 }
1179
1180 if (client->irq < 0) {
1181 if (client->irq != -EPROBE_DEFER)
1182 dev_err(&client->dev,
1183 "HID over i2c doesn't have a valid IRQ\n");
1184 return client->irq;
1185 }
1186
1187 ihid = devm_kzalloc(&client->dev, sizeof(*ihid), GFP_KERNEL);
1188 if (!ihid)
1189 return -ENOMEM;
1190
1191 i2c_set_clientdata(client, ihid);
1192
1193 ihid->ops = ops;
1194 ihid->client = client;
1195 ihid->wHIDDescRegister = cpu_to_le16(hid_descriptor_address);
1196 ihid->is_panel_follower = drm_is_panel_follower(&client->dev);
1197
1198 init_waitqueue_head(&ihid->wait);
1199 mutex_init(&ihid->reset_lock);
1200 INIT_WORK(&ihid->panel_follower_prepare_work, ihid_core_panel_prepare_work);
1201
1202 /* we need to allocate the command buffer without knowing the maximum
1203 * size of the reports. Let's use HID_MIN_BUFFER_SIZE, then we do the
1204 * real computation later. */
1205 ret = i2c_hid_alloc_buffers(ihid, HID_MIN_BUFFER_SIZE);
1206 if (ret < 0)
1207 return ret;
1208 device_enable_async_suspend(&client->dev);
1209
1210 hid = hid_allocate_device();
1211 if (IS_ERR(hid)) {
1212 ret = PTR_ERR(hid);
1213 goto err_free_buffers;
1214 }
1215
1216 ihid->hid = hid;
1217
1218 hid->driver_data = client;
1219 hid->ll_driver = &i2c_hid_ll_driver;
1220 hid->dev.parent = &client->dev;
1221 hid->bus = BUS_I2C;
1222 hid->initial_quirks = quirks;
1223
1224 /* Power on and probe unless device is a panel follower. */
1225 if (!ihid->is_panel_follower) {
1226 ret = i2c_hid_core_power_up(ihid);
1227 if (ret < 0)
1228 goto err_destroy_device;
1229
1230 ret = __i2c_hid_core_probe(ihid);
1231 if (ret < 0)
1232 goto err_power_down;
1233 }
1234
1235 ret = i2c_hid_init_irq(client);
1236 if (ret < 0)
1237 goto err_power_down;
1238
1239 /*
1240 * If we're a panel follower, we'll register when the panel turns on;
1241 * otherwise we do it right away.
1242 */
1243 if (ihid->is_panel_follower)
1244 ret = i2c_hid_core_register_panel_follower(ihid);
1245 else
1246 ret = i2c_hid_core_register_hid(ihid);
1247 if (ret)
1248 goto err_free_irq;
1249
1250 return 0;
1251
1252 err_free_irq:
1253 free_irq(client->irq, ihid);
1254 err_power_down:
1255 if (!ihid->is_panel_follower)
1256 i2c_hid_core_power_down(ihid);
1257 err_destroy_device:
1258 hid_destroy_device(hid);
1259 err_free_buffers:
1260 i2c_hid_free_buffers(ihid);
1261
1262 return ret;
1263 }
1264 EXPORT_SYMBOL_GPL(i2c_hid_core_probe);
1265
i2c_hid_core_remove(struct i2c_client * client)1266 void i2c_hid_core_remove(struct i2c_client *client)
1267 {
1268 struct i2c_hid *ihid = i2c_get_clientdata(client);
1269 struct hid_device *hid;
1270
1271 /*
1272 * If we're a follower, the act of unfollowing will cause us to be
1273 * powered down. Otherwise we need to manually do it.
1274 */
1275 if (ihid->is_panel_follower)
1276 drm_panel_remove_follower(&ihid->panel_follower);
1277 else
1278 i2c_hid_core_suspend(ihid, true);
1279
1280 hid = ihid->hid;
1281 hid_destroy_device(hid);
1282
1283 free_irq(client->irq, ihid);
1284
1285 if (ihid->bufsize)
1286 i2c_hid_free_buffers(ihid);
1287 }
1288 EXPORT_SYMBOL_GPL(i2c_hid_core_remove);
1289
i2c_hid_core_shutdown(struct i2c_client * client)1290 void i2c_hid_core_shutdown(struct i2c_client *client)
1291 {
1292 struct i2c_hid *ihid = i2c_get_clientdata(client);
1293
1294 i2c_hid_set_power(ihid, I2C_HID_PWR_SLEEP);
1295 free_irq(client->irq, ihid);
1296
1297 i2c_hid_core_shutdown_tail(ihid);
1298 }
1299 EXPORT_SYMBOL_GPL(i2c_hid_core_shutdown);
1300
i2c_hid_core_pm_suspend(struct device * dev)1301 static int i2c_hid_core_pm_suspend(struct device *dev)
1302 {
1303 struct i2c_client *client = to_i2c_client(dev);
1304 struct i2c_hid *ihid = i2c_get_clientdata(client);
1305
1306 if (ihid->is_panel_follower)
1307 return 0;
1308
1309 return i2c_hid_core_suspend(ihid, false);
1310 }
1311
i2c_hid_core_pm_resume(struct device * dev)1312 static int i2c_hid_core_pm_resume(struct device *dev)
1313 {
1314 struct i2c_client *client = to_i2c_client(dev);
1315 struct i2c_hid *ihid = i2c_get_clientdata(client);
1316
1317 if (ihid->is_panel_follower)
1318 return 0;
1319
1320 return i2c_hid_core_resume(ihid);
1321 }
1322
1323 const struct dev_pm_ops i2c_hid_core_pm = {
1324 SYSTEM_SLEEP_PM_OPS(i2c_hid_core_pm_suspend, i2c_hid_core_pm_resume)
1325 };
1326 EXPORT_SYMBOL_GPL(i2c_hid_core_pm);
1327
1328 MODULE_DESCRIPTION("HID over I2C core driver");
1329 MODULE_AUTHOR("Benjamin Tissoires <benjamin.tissoires@gmail.com>");
1330 MODULE_LICENSE("GPL");
1331