Commit | Line | Data |
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4a200c3b BT |
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/delay.h> | |
26 | #include <linux/slab.h> | |
27 | #include <linux/pm.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> | |
4a200c3b | 35 | #include <linux/hid.h> |
7a7d6d9c | 36 | #include <linux/mutex.h> |
92241e67 | 37 | #include <linux/acpi.h> |
4a200c3b BT |
38 | |
39 | #include <linux/i2c/i2c-hid.h> | |
40 | ||
41 | /* flags */ | |
42 | #define I2C_HID_STARTED (1 << 0) | |
43 | #define I2C_HID_RESET_PENDING (1 << 1) | |
44 | #define I2C_HID_READ_PENDING (1 << 2) | |
45 | ||
46 | #define I2C_HID_PWR_ON 0x00 | |
47 | #define I2C_HID_PWR_SLEEP 0x01 | |
48 | ||
49 | /* debug option */ | |
ee8e8806 | 50 | static bool debug; |
4a200c3b BT |
51 | module_param(debug, bool, 0444); |
52 | MODULE_PARM_DESC(debug, "print a lot of debug information"); | |
53 | ||
fa738644 BT |
54 | #define i2c_hid_dbg(ihid, fmt, arg...) \ |
55 | do { \ | |
56 | if (debug) \ | |
57 | dev_printk(KERN_DEBUG, &(ihid)->client->dev, fmt, ##arg); \ | |
58 | } while (0) | |
4a200c3b BT |
59 | |
60 | struct i2c_hid_desc { | |
61 | __le16 wHIDDescLength; | |
62 | __le16 bcdVersion; | |
63 | __le16 wReportDescLength; | |
64 | __le16 wReportDescRegister; | |
65 | __le16 wInputRegister; | |
66 | __le16 wMaxInputLength; | |
67 | __le16 wOutputRegister; | |
68 | __le16 wMaxOutputLength; | |
69 | __le16 wCommandRegister; | |
70 | __le16 wDataRegister; | |
71 | __le16 wVendorID; | |
72 | __le16 wProductID; | |
73 | __le16 wVersionID; | |
27174cff | 74 | __le32 reserved; |
4a200c3b BT |
75 | } __packed; |
76 | ||
77 | struct i2c_hid_cmd { | |
78 | unsigned int registerIndex; | |
79 | __u8 opcode; | |
80 | unsigned int length; | |
81 | bool wait; | |
82 | }; | |
83 | ||
84 | union command { | |
85 | u8 data[0]; | |
86 | struct cmd { | |
87 | __le16 reg; | |
88 | __u8 reportTypeID; | |
89 | __u8 opcode; | |
90 | } __packed c; | |
91 | }; | |
92 | ||
93 | #define I2C_HID_CMD(opcode_) \ | |
94 | .opcode = opcode_, .length = 4, \ | |
95 | .registerIndex = offsetof(struct i2c_hid_desc, wCommandRegister) | |
96 | ||
97 | /* fetch HID descriptor */ | |
98 | static const struct i2c_hid_cmd hid_descr_cmd = { .length = 2 }; | |
99 | /* fetch report descriptors */ | |
100 | static const struct i2c_hid_cmd hid_report_descr_cmd = { | |
101 | .registerIndex = offsetof(struct i2c_hid_desc, | |
102 | wReportDescRegister), | |
103 | .opcode = 0x00, | |
104 | .length = 2 }; | |
105 | /* commands */ | |
106 | static const struct i2c_hid_cmd hid_reset_cmd = { I2C_HID_CMD(0x01), | |
107 | .wait = true }; | |
108 | static const struct i2c_hid_cmd hid_get_report_cmd = { I2C_HID_CMD(0x02) }; | |
109 | static const struct i2c_hid_cmd hid_set_report_cmd = { I2C_HID_CMD(0x03) }; | |
4a200c3b | 110 | static const struct i2c_hid_cmd hid_set_power_cmd = { I2C_HID_CMD(0x08) }; |
6bf6c8bf BT |
111 | |
112 | /* | |
113 | * These definitions are not used here, but are defined by the spec. | |
114 | * Keeping them here for documentation purposes. | |
115 | * | |
116 | * static const struct i2c_hid_cmd hid_get_idle_cmd = { I2C_HID_CMD(0x04) }; | |
117 | * static const struct i2c_hid_cmd hid_set_idle_cmd = { I2C_HID_CMD(0x05) }; | |
118 | * static const struct i2c_hid_cmd hid_get_protocol_cmd = { I2C_HID_CMD(0x06) }; | |
119 | * static const struct i2c_hid_cmd hid_set_protocol_cmd = { I2C_HID_CMD(0x07) }; | |
120 | */ | |
4a200c3b | 121 | |
7a7d6d9c BT |
122 | static DEFINE_MUTEX(i2c_hid_open_mut); |
123 | ||
4a200c3b BT |
124 | /* The main device structure */ |
125 | struct i2c_hid { | |
126 | struct i2c_client *client; /* i2c client */ | |
127 | struct hid_device *hid; /* pointer to corresponding HID dev */ | |
128 | union { | |
129 | __u8 hdesc_buffer[sizeof(struct i2c_hid_desc)]; | |
130 | struct i2c_hid_desc hdesc; /* the HID Descriptor */ | |
131 | }; | |
132 | __le16 wHIDDescRegister; /* location of the i2c | |
133 | * register of the HID | |
134 | * descriptor. */ | |
135 | unsigned int bufsize; /* i2c buffer size */ | |
136 | char *inbuf; /* Input buffer */ | |
caa853b3 | 137 | char *rawbuf; /* Raw Input buffer */ |
4a200c3b BT |
138 | char *cmdbuf; /* Command buffer */ |
139 | char *argsbuf; /* Command arguments buffer */ | |
140 | ||
141 | unsigned long flags; /* device flags */ | |
142 | ||
4a200c3b | 143 | wait_queue_head_t wait; /* For waiting the interrupt */ |
92241e67 MW |
144 | |
145 | struct i2c_hid_platform_data pdata; | |
4a200c3b BT |
146 | }; |
147 | ||
148 | static int __i2c_hid_command(struct i2c_client *client, | |
149 | const struct i2c_hid_cmd *command, u8 reportID, | |
150 | u8 reportType, u8 *args, int args_len, | |
151 | unsigned char *buf_recv, int data_len) | |
152 | { | |
153 | struct i2c_hid *ihid = i2c_get_clientdata(client); | |
154 | union command *cmd = (union command *)ihid->cmdbuf; | |
155 | int ret; | |
156 | struct i2c_msg msg[2]; | |
157 | int msg_num = 1; | |
158 | ||
159 | int length = command->length; | |
160 | bool wait = command->wait; | |
161 | unsigned int registerIndex = command->registerIndex; | |
162 | ||
163 | /* special case for hid_descr_cmd */ | |
164 | if (command == &hid_descr_cmd) { | |
165 | cmd->c.reg = ihid->wHIDDescRegister; | |
166 | } else { | |
167 | cmd->data[0] = ihid->hdesc_buffer[registerIndex]; | |
168 | cmd->data[1] = ihid->hdesc_buffer[registerIndex + 1]; | |
169 | } | |
170 | ||
171 | if (length > 2) { | |
172 | cmd->c.opcode = command->opcode; | |
173 | cmd->c.reportTypeID = reportID | reportType << 4; | |
174 | } | |
175 | ||
176 | memcpy(cmd->data + length, args, args_len); | |
177 | length += args_len; | |
178 | ||
179 | i2c_hid_dbg(ihid, "%s: cmd=%*ph\n", __func__, length, cmd->data); | |
180 | ||
181 | msg[0].addr = client->addr; | |
182 | msg[0].flags = client->flags & I2C_M_TEN; | |
183 | msg[0].len = length; | |
184 | msg[0].buf = cmd->data; | |
185 | if (data_len > 0) { | |
186 | msg[1].addr = client->addr; | |
187 | msg[1].flags = client->flags & I2C_M_TEN; | |
188 | msg[1].flags |= I2C_M_RD; | |
189 | msg[1].len = data_len; | |
190 | msg[1].buf = buf_recv; | |
191 | msg_num = 2; | |
192 | set_bit(I2C_HID_READ_PENDING, &ihid->flags); | |
193 | } | |
194 | ||
195 | if (wait) | |
196 | set_bit(I2C_HID_RESET_PENDING, &ihid->flags); | |
197 | ||
198 | ret = i2c_transfer(client->adapter, msg, msg_num); | |
199 | ||
200 | if (data_len > 0) | |
201 | clear_bit(I2C_HID_READ_PENDING, &ihid->flags); | |
202 | ||
203 | if (ret != msg_num) | |
204 | return ret < 0 ? ret : -EIO; | |
205 | ||
206 | ret = 0; | |
207 | ||
208 | if (wait) { | |
209 | i2c_hid_dbg(ihid, "%s: waiting...\n", __func__); | |
210 | if (!wait_event_timeout(ihid->wait, | |
211 | !test_bit(I2C_HID_RESET_PENDING, &ihid->flags), | |
212 | msecs_to_jiffies(5000))) | |
213 | ret = -ENODATA; | |
214 | i2c_hid_dbg(ihid, "%s: finished.\n", __func__); | |
215 | } | |
216 | ||
217 | return ret; | |
218 | } | |
219 | ||
220 | static int i2c_hid_command(struct i2c_client *client, | |
221 | const struct i2c_hid_cmd *command, | |
222 | unsigned char *buf_recv, int data_len) | |
223 | { | |
224 | return __i2c_hid_command(client, command, 0, 0, NULL, 0, | |
225 | buf_recv, data_len); | |
226 | } | |
227 | ||
228 | static int i2c_hid_get_report(struct i2c_client *client, u8 reportType, | |
229 | u8 reportID, unsigned char *buf_recv, int data_len) | |
230 | { | |
231 | struct i2c_hid *ihid = i2c_get_clientdata(client); | |
232 | u8 args[3]; | |
233 | int ret; | |
234 | int args_len = 0; | |
235 | u16 readRegister = le16_to_cpu(ihid->hdesc.wDataRegister); | |
236 | ||
237 | i2c_hid_dbg(ihid, "%s\n", __func__); | |
238 | ||
239 | if (reportID >= 0x0F) { | |
240 | args[args_len++] = reportID; | |
241 | reportID = 0x0F; | |
242 | } | |
243 | ||
244 | args[args_len++] = readRegister & 0xFF; | |
245 | args[args_len++] = readRegister >> 8; | |
246 | ||
247 | ret = __i2c_hid_command(client, &hid_get_report_cmd, reportID, | |
248 | reportType, args, args_len, buf_recv, data_len); | |
249 | if (ret) { | |
250 | dev_err(&client->dev, | |
251 | "failed to retrieve report from device.\n"); | |
317b204a | 252 | return ret; |
4a200c3b BT |
253 | } |
254 | ||
255 | return 0; | |
256 | } | |
257 | ||
258 | static int i2c_hid_set_report(struct i2c_client *client, u8 reportType, | |
259 | u8 reportID, unsigned char *buf, size_t data_len) | |
260 | { | |
261 | struct i2c_hid *ihid = i2c_get_clientdata(client); | |
262 | u8 *args = ihid->argsbuf; | |
263 | int ret; | |
264 | u16 dataRegister = le16_to_cpu(ihid->hdesc.wDataRegister); | |
265 | ||
266 | /* hidraw already checked that data_len < HID_MAX_BUFFER_SIZE */ | |
267 | u16 size = 2 /* size */ + | |
268 | (reportID ? 1 : 0) /* reportID */ + | |
269 | data_len /* buf */; | |
270 | int args_len = (reportID >= 0x0F ? 1 : 0) /* optional third byte */ + | |
271 | 2 /* dataRegister */ + | |
272 | size /* args */; | |
273 | int index = 0; | |
274 | ||
275 | i2c_hid_dbg(ihid, "%s\n", __func__); | |
276 | ||
277 | if (reportID >= 0x0F) { | |
278 | args[index++] = reportID; | |
279 | reportID = 0x0F; | |
280 | } | |
281 | ||
282 | args[index++] = dataRegister & 0xFF; | |
283 | args[index++] = dataRegister >> 8; | |
284 | ||
285 | args[index++] = size & 0xFF; | |
286 | args[index++] = size >> 8; | |
287 | ||
288 | if (reportID) | |
289 | args[index++] = reportID; | |
290 | ||
291 | memcpy(&args[index], buf, data_len); | |
292 | ||
293 | ret = __i2c_hid_command(client, &hid_set_report_cmd, reportID, | |
294 | reportType, args, args_len, NULL, 0); | |
295 | if (ret) { | |
296 | dev_err(&client->dev, "failed to set a report to device.\n"); | |
317b204a | 297 | return ret; |
4a200c3b BT |
298 | } |
299 | ||
300 | return data_len; | |
301 | } | |
302 | ||
303 | static int i2c_hid_set_power(struct i2c_client *client, int power_state) | |
304 | { | |
305 | struct i2c_hid *ihid = i2c_get_clientdata(client); | |
306 | int ret; | |
307 | ||
308 | i2c_hid_dbg(ihid, "%s\n", __func__); | |
309 | ||
310 | ret = __i2c_hid_command(client, &hid_set_power_cmd, power_state, | |
311 | 0, NULL, 0, NULL, 0); | |
312 | if (ret) | |
313 | dev_err(&client->dev, "failed to change power setting.\n"); | |
314 | ||
315 | return ret; | |
316 | } | |
317 | ||
318 | static int i2c_hid_hwreset(struct i2c_client *client) | |
319 | { | |
320 | struct i2c_hid *ihid = i2c_get_clientdata(client); | |
321 | int ret; | |
322 | ||
323 | i2c_hid_dbg(ihid, "%s\n", __func__); | |
324 | ||
325 | ret = i2c_hid_set_power(client, I2C_HID_PWR_ON); | |
326 | if (ret) | |
327 | return ret; | |
328 | ||
02f1f3f6 BM |
329 | /* |
330 | * The HID over I2C specification states that if a DEVICE needs time | |
331 | * after the PWR_ON request, it should utilise CLOCK stretching. | |
332 | * However, it has been observered that the Windows driver provides a | |
333 | * 1ms sleep between the PWR_ON and RESET requests and that some devices | |
334 | * rely on this. | |
335 | */ | |
336 | usleep_range(1000, 5000); | |
337 | ||
4a200c3b BT |
338 | i2c_hid_dbg(ihid, "resetting...\n"); |
339 | ||
340 | ret = i2c_hid_command(client, &hid_reset_cmd, NULL, 0); | |
341 | if (ret) { | |
342 | dev_err(&client->dev, "failed to reset device.\n"); | |
343 | i2c_hid_set_power(client, I2C_HID_PWR_SLEEP); | |
344 | return ret; | |
345 | } | |
346 | ||
347 | return 0; | |
348 | } | |
349 | ||
317b204a | 350 | static void i2c_hid_get_input(struct i2c_hid *ihid) |
4a200c3b BT |
351 | { |
352 | int ret, ret_size; | |
de13322c SF |
353 | int size = le16_to_cpu(ihid->hdesc.wMaxInputLength); |
354 | ||
355 | if (size > ihid->bufsize) | |
356 | size = ihid->bufsize; | |
4a200c3b BT |
357 | |
358 | ret = i2c_master_recv(ihid->client, ihid->inbuf, size); | |
359 | if (ret != size) { | |
360 | if (ret < 0) | |
317b204a | 361 | return; |
4a200c3b BT |
362 | |
363 | dev_err(&ihid->client->dev, "%s: got %d data instead of %d\n", | |
364 | __func__, ret, size); | |
317b204a | 365 | return; |
4a200c3b BT |
366 | } |
367 | ||
368 | ret_size = ihid->inbuf[0] | ihid->inbuf[1] << 8; | |
369 | ||
370 | if (!ret_size) { | |
371 | /* host or device initiated RESET completed */ | |
372 | if (test_and_clear_bit(I2C_HID_RESET_PENDING, &ihid->flags)) | |
373 | wake_up(&ihid->wait); | |
317b204a | 374 | return; |
4a200c3b BT |
375 | } |
376 | ||
377 | if (ret_size > size) { | |
378 | dev_err(&ihid->client->dev, "%s: incomplete report (%d/%d)\n", | |
379 | __func__, size, ret_size); | |
317b204a | 380 | return; |
4a200c3b BT |
381 | } |
382 | ||
383 | i2c_hid_dbg(ihid, "input: %*ph\n", ret_size, ihid->inbuf); | |
384 | ||
385 | if (test_bit(I2C_HID_STARTED, &ihid->flags)) | |
386 | hid_input_report(ihid->hid, HID_INPUT_REPORT, ihid->inbuf + 2, | |
387 | ret_size - 2, 1); | |
388 | ||
317b204a | 389 | return; |
4a200c3b BT |
390 | } |
391 | ||
392 | static irqreturn_t i2c_hid_irq(int irq, void *dev_id) | |
393 | { | |
394 | struct i2c_hid *ihid = dev_id; | |
395 | ||
396 | if (test_bit(I2C_HID_READ_PENDING, &ihid->flags)) | |
397 | return IRQ_HANDLED; | |
398 | ||
399 | i2c_hid_get_input(ihid); | |
400 | ||
401 | return IRQ_HANDLED; | |
402 | } | |
403 | ||
404 | static int i2c_hid_get_report_length(struct hid_report *report) | |
405 | { | |
406 | return ((report->size - 1) >> 3) + 1 + | |
407 | report->device->report_enum[report->type].numbered + 2; | |
408 | } | |
409 | ||
410 | static void i2c_hid_init_report(struct hid_report *report, u8 *buffer, | |
411 | size_t bufsize) | |
412 | { | |
413 | struct hid_device *hid = report->device; | |
414 | struct i2c_client *client = hid->driver_data; | |
415 | struct i2c_hid *ihid = i2c_get_clientdata(client); | |
416 | unsigned int size, ret_size; | |
417 | ||
418 | size = i2c_hid_get_report_length(report); | |
c737bcf9 | 419 | if (i2c_hid_get_report(client, |
4a200c3b | 420 | report->type == HID_FEATURE_REPORT ? 0x03 : 0x01, |
c737bcf9 BT |
421 | report->id, buffer, size)) |
422 | return; | |
4a200c3b BT |
423 | |
424 | i2c_hid_dbg(ihid, "report (len=%d): %*ph\n", size, size, ihid->inbuf); | |
425 | ||
426 | ret_size = buffer[0] | (buffer[1] << 8); | |
427 | ||
428 | if (ret_size != size) { | |
429 | dev_err(&client->dev, "error in %s size:%d / ret_size:%d\n", | |
430 | __func__, size, ret_size); | |
431 | return; | |
432 | } | |
433 | ||
434 | /* hid->driver_lock is held as we are in probe function, | |
435 | * we just need to setup the input fields, so using | |
436 | * hid_report_raw_event is safe. */ | |
437 | hid_report_raw_event(hid, report->type, buffer + 2, size - 2, 1); | |
438 | } | |
439 | ||
440 | /* | |
441 | * Initialize all reports | |
442 | */ | |
443 | static void i2c_hid_init_reports(struct hid_device *hid) | |
444 | { | |
445 | struct hid_report *report; | |
446 | struct i2c_client *client = hid->driver_data; | |
447 | struct i2c_hid *ihid = i2c_get_clientdata(client); | |
448 | u8 *inbuf = kzalloc(ihid->bufsize, GFP_KERNEL); | |
449 | ||
317b204a BT |
450 | if (!inbuf) { |
451 | dev_err(&client->dev, "can not retrieve initial reports\n"); | |
4a200c3b | 452 | return; |
317b204a | 453 | } |
4a200c3b BT |
454 | |
455 | list_for_each_entry(report, | |
456 | &hid->report_enum[HID_INPUT_REPORT].report_list, list) | |
457 | i2c_hid_init_report(report, inbuf, ihid->bufsize); | |
458 | ||
459 | list_for_each_entry(report, | |
460 | &hid->report_enum[HID_FEATURE_REPORT].report_list, list) | |
461 | i2c_hid_init_report(report, inbuf, ihid->bufsize); | |
462 | ||
463 | kfree(inbuf); | |
464 | } | |
465 | ||
466 | /* | |
467 | * Traverse the supplied list of reports and find the longest | |
468 | */ | |
469 | static void i2c_hid_find_max_report(struct hid_device *hid, unsigned int type, | |
470 | unsigned int *max) | |
471 | { | |
472 | struct hid_report *report; | |
473 | unsigned int size; | |
474 | ||
475 | /* We should not rely on wMaxInputLength, as some devices may set it to | |
476 | * a wrong length. */ | |
477 | list_for_each_entry(report, &hid->report_enum[type].report_list, list) { | |
478 | size = i2c_hid_get_report_length(report); | |
479 | if (*max < size) | |
480 | *max = size; | |
481 | } | |
482 | } | |
483 | ||
29b45787 BT |
484 | static void i2c_hid_free_buffers(struct i2c_hid *ihid) |
485 | { | |
486 | kfree(ihid->inbuf); | |
caa853b3 | 487 | kfree(ihid->rawbuf); |
29b45787 BT |
488 | kfree(ihid->argsbuf); |
489 | kfree(ihid->cmdbuf); | |
490 | ihid->inbuf = NULL; | |
caa853b3 | 491 | ihid->rawbuf = NULL; |
29b45787 BT |
492 | ihid->cmdbuf = NULL; |
493 | ihid->argsbuf = NULL; | |
494 | ihid->bufsize = 0; | |
495 | } | |
496 | ||
497 | static int i2c_hid_alloc_buffers(struct i2c_hid *ihid, size_t report_size) | |
4a200c3b BT |
498 | { |
499 | /* the worst case is computed from the set_report command with a | |
500 | * reportID > 15 and the maximum report length */ | |
501 | int args_len = sizeof(__u8) + /* optional ReportID byte */ | |
502 | sizeof(__u16) + /* data register */ | |
503 | sizeof(__u16) + /* size of the report */ | |
29b45787 | 504 | report_size; /* report */ |
4a200c3b | 505 | |
29b45787 | 506 | ihid->inbuf = kzalloc(report_size, GFP_KERNEL); |
caa853b3 | 507 | ihid->rawbuf = kzalloc(report_size, GFP_KERNEL); |
4a200c3b | 508 | ihid->argsbuf = kzalloc(args_len, GFP_KERNEL); |
4a200c3b BT |
509 | ihid->cmdbuf = kzalloc(sizeof(union command) + args_len, GFP_KERNEL); |
510 | ||
caa853b3 | 511 | if (!ihid->inbuf || !ihid->rawbuf || !ihid->argsbuf || !ihid->cmdbuf) { |
29b45787 | 512 | i2c_hid_free_buffers(ihid); |
4a200c3b BT |
513 | return -ENOMEM; |
514 | } | |
515 | ||
29b45787 | 516 | ihid->bufsize = report_size; |
4a200c3b | 517 | |
29b45787 | 518 | return 0; |
4a200c3b BT |
519 | } |
520 | ||
521 | static int i2c_hid_get_raw_report(struct hid_device *hid, | |
522 | unsigned char report_number, __u8 *buf, size_t count, | |
523 | unsigned char report_type) | |
524 | { | |
525 | struct i2c_client *client = hid->driver_data; | |
526 | struct i2c_hid *ihid = i2c_get_clientdata(client); | |
e5b50fe7 | 527 | size_t ret_count, ask_count; |
4a200c3b BT |
528 | int ret; |
529 | ||
530 | if (report_type == HID_OUTPUT_REPORT) | |
531 | return -EINVAL; | |
532 | ||
e5b50fe7 BT |
533 | /* +2 bytes to include the size of the reply in the query buffer */ |
534 | ask_count = min(count + 2, (size_t)ihid->bufsize); | |
4a200c3b BT |
535 | |
536 | ret = i2c_hid_get_report(client, | |
537 | report_type == HID_FEATURE_REPORT ? 0x03 : 0x01, | |
caa853b3 | 538 | report_number, ihid->rawbuf, ask_count); |
4a200c3b BT |
539 | |
540 | if (ret < 0) | |
541 | return ret; | |
542 | ||
caa853b3 | 543 | ret_count = ihid->rawbuf[0] | (ihid->rawbuf[1] << 8); |
4a200c3b | 544 | |
9afd09a1 | 545 | if (ret_count <= 2) |
e5b50fe7 BT |
546 | return 0; |
547 | ||
548 | ret_count = min(ret_count, ask_count); | |
549 | ||
550 | /* The query buffer contains the size, dropping it in the reply */ | |
551 | count = min(count, ret_count - 2); | |
caa853b3 | 552 | memcpy(buf, ihid->rawbuf + 2, count); |
4a200c3b BT |
553 | |
554 | return count; | |
555 | } | |
556 | ||
557 | static int i2c_hid_output_raw_report(struct hid_device *hid, __u8 *buf, | |
558 | size_t count, unsigned char report_type) | |
559 | { | |
560 | struct i2c_client *client = hid->driver_data; | |
561 | int report_id = buf[0]; | |
c284979a | 562 | int ret; |
4a200c3b BT |
563 | |
564 | if (report_type == HID_INPUT_REPORT) | |
565 | return -EINVAL; | |
566 | ||
c284979a BT |
567 | if (report_id) { |
568 | buf++; | |
569 | count--; | |
570 | } | |
571 | ||
572 | ret = i2c_hid_set_report(client, | |
4a200c3b BT |
573 | report_type == HID_FEATURE_REPORT ? 0x03 : 0x02, |
574 | report_id, buf, count); | |
c284979a BT |
575 | |
576 | if (report_id && ret >= 0) | |
577 | ret++; /* add report_id to the number of transfered bytes */ | |
578 | ||
579 | return ret; | |
4a200c3b BT |
580 | } |
581 | ||
545bef68 BT |
582 | static void i2c_hid_request(struct hid_device *hid, struct hid_report *rep, |
583 | int reqtype) | |
584 | { | |
585 | struct i2c_client *client = hid->driver_data; | |
545bef68 BT |
586 | char *buf; |
587 | int ret; | |
7c4d5773 | 588 | int len = i2c_hid_get_report_length(rep) - 2; |
545bef68 | 589 | |
7c4d5773 | 590 | buf = kzalloc(len, GFP_KERNEL); |
545bef68 BT |
591 | if (!buf) |
592 | return; | |
593 | ||
594 | switch (reqtype) { | |
595 | case HID_REQ_GET_REPORT: | |
7c4d5773 | 596 | ret = i2c_hid_get_raw_report(hid, rep->id, buf, len, rep->type); |
545bef68 BT |
597 | if (ret < 0) |
598 | dev_err(&client->dev, "%s: unable to get report: %d\n", | |
599 | __func__, ret); | |
600 | else | |
601 | hid_input_report(hid, rep->type, buf, ret, 0); | |
602 | break; | |
603 | case HID_REQ_SET_REPORT: | |
604 | hid_output_report(rep, buf); | |
7c4d5773 | 605 | i2c_hid_output_raw_report(hid, buf, len, rep->type); |
545bef68 BT |
606 | break; |
607 | } | |
608 | ||
609 | kfree(buf); | |
610 | } | |
611 | ||
4a200c3b BT |
612 | static int i2c_hid_parse(struct hid_device *hid) |
613 | { | |
614 | struct i2c_client *client = hid->driver_data; | |
615 | struct i2c_hid *ihid = i2c_get_clientdata(client); | |
616 | struct i2c_hid_desc *hdesc = &ihid->hdesc; | |
617 | unsigned int rsize; | |
618 | char *rdesc; | |
619 | int ret; | |
620 | int tries = 3; | |
621 | ||
622 | i2c_hid_dbg(ihid, "entering %s\n", __func__); | |
623 | ||
624 | rsize = le16_to_cpu(hdesc->wReportDescLength); | |
625 | if (!rsize || rsize > HID_MAX_DESCRIPTOR_SIZE) { | |
626 | dbg_hid("weird size of report descriptor (%u)\n", rsize); | |
627 | return -EINVAL; | |
628 | } | |
629 | ||
630 | do { | |
631 | ret = i2c_hid_hwreset(client); | |
632 | if (ret) | |
633 | msleep(1000); | |
634 | } while (tries-- > 0 && ret); | |
635 | ||
636 | if (ret) | |
637 | return ret; | |
638 | ||
639 | rdesc = kzalloc(rsize, GFP_KERNEL); | |
640 | ||
641 | if (!rdesc) { | |
642 | dbg_hid("couldn't allocate rdesc memory\n"); | |
643 | return -ENOMEM; | |
644 | } | |
645 | ||
646 | i2c_hid_dbg(ihid, "asking HID report descriptor\n"); | |
647 | ||
648 | ret = i2c_hid_command(client, &hid_report_descr_cmd, rdesc, rsize); | |
649 | if (ret) { | |
650 | hid_err(hid, "reading report descriptor failed\n"); | |
651 | kfree(rdesc); | |
652 | return -EIO; | |
653 | } | |
654 | ||
655 | i2c_hid_dbg(ihid, "Report Descriptor: %*ph\n", rsize, rdesc); | |
656 | ||
657 | ret = hid_parse_report(hid, rdesc, rsize); | |
658 | kfree(rdesc); | |
659 | if (ret) { | |
660 | dbg_hid("parsing report descriptor failed\n"); | |
661 | return ret; | |
662 | } | |
663 | ||
664 | return 0; | |
665 | } | |
666 | ||
667 | static int i2c_hid_start(struct hid_device *hid) | |
668 | { | |
669 | struct i2c_client *client = hid->driver_data; | |
670 | struct i2c_hid *ihid = i2c_get_clientdata(client); | |
671 | int ret; | |
29b45787 | 672 | unsigned int bufsize = HID_MIN_BUFFER_SIZE; |
4a200c3b | 673 | |
29b45787 BT |
674 | i2c_hid_find_max_report(hid, HID_INPUT_REPORT, &bufsize); |
675 | i2c_hid_find_max_report(hid, HID_OUTPUT_REPORT, &bufsize); | |
676 | i2c_hid_find_max_report(hid, HID_FEATURE_REPORT, &bufsize); | |
4a200c3b | 677 | |
29b45787 | 678 | if (bufsize > ihid->bufsize) { |
4a200c3b BT |
679 | i2c_hid_free_buffers(ihid); |
680 | ||
29b45787 | 681 | ret = i2c_hid_alloc_buffers(ihid, bufsize); |
4a200c3b | 682 | |
29b45787 | 683 | if (ret) |
4a200c3b | 684 | return ret; |
4a200c3b BT |
685 | } |
686 | ||
687 | if (!(hid->quirks & HID_QUIRK_NO_INIT_REPORTS)) | |
688 | i2c_hid_init_reports(hid); | |
689 | ||
690 | return 0; | |
691 | } | |
692 | ||
693 | static void i2c_hid_stop(struct hid_device *hid) | |
694 | { | |
695 | struct i2c_client *client = hid->driver_data; | |
696 | struct i2c_hid *ihid = i2c_get_clientdata(client); | |
697 | ||
698 | hid->claimed = 0; | |
699 | ||
700 | i2c_hid_free_buffers(ihid); | |
701 | } | |
702 | ||
703 | static int i2c_hid_open(struct hid_device *hid) | |
704 | { | |
705 | struct i2c_client *client = hid->driver_data; | |
706 | struct i2c_hid *ihid = i2c_get_clientdata(client); | |
7a7d6d9c | 707 | int ret = 0; |
4a200c3b | 708 | |
7a7d6d9c | 709 | mutex_lock(&i2c_hid_open_mut); |
4a200c3b BT |
710 | if (!hid->open++) { |
711 | ret = i2c_hid_set_power(client, I2C_HID_PWR_ON); | |
712 | if (ret) { | |
713 | hid->open--; | |
7a7d6d9c | 714 | goto done; |
4a200c3b BT |
715 | } |
716 | set_bit(I2C_HID_STARTED, &ihid->flags); | |
717 | } | |
7a7d6d9c BT |
718 | done: |
719 | mutex_unlock(&i2c_hid_open_mut); | |
720 | return ret; | |
4a200c3b BT |
721 | } |
722 | ||
723 | static void i2c_hid_close(struct hid_device *hid) | |
724 | { | |
725 | struct i2c_client *client = hid->driver_data; | |
726 | struct i2c_hid *ihid = i2c_get_clientdata(client); | |
727 | ||
728 | /* protecting hid->open to make sure we don't restart | |
729 | * data acquistion due to a resumption we no longer | |
730 | * care about | |
731 | */ | |
7a7d6d9c | 732 | mutex_lock(&i2c_hid_open_mut); |
4a200c3b BT |
733 | if (!--hid->open) { |
734 | clear_bit(I2C_HID_STARTED, &ihid->flags); | |
735 | ||
736 | /* Save some power */ | |
737 | i2c_hid_set_power(client, I2C_HID_PWR_SLEEP); | |
738 | } | |
7a7d6d9c | 739 | mutex_unlock(&i2c_hid_open_mut); |
4a200c3b BT |
740 | } |
741 | ||
742 | static int i2c_hid_power(struct hid_device *hid, int lvl) | |
743 | { | |
744 | struct i2c_client *client = hid->driver_data; | |
745 | struct i2c_hid *ihid = i2c_get_clientdata(client); | |
746 | int ret = 0; | |
747 | ||
748 | i2c_hid_dbg(ihid, "%s lvl:%d\n", __func__, lvl); | |
749 | ||
750 | switch (lvl) { | |
751 | case PM_HINT_FULLON: | |
752 | ret = i2c_hid_set_power(client, I2C_HID_PWR_ON); | |
753 | break; | |
754 | case PM_HINT_NORMAL: | |
755 | ret = i2c_hid_set_power(client, I2C_HID_PWR_SLEEP); | |
756 | break; | |
757 | } | |
758 | return ret; | |
759 | } | |
760 | ||
761 | static int i2c_hid_hidinput_input_event(struct input_dev *dev, | |
762 | unsigned int type, unsigned int code, int value) | |
763 | { | |
764 | struct hid_device *hid = input_get_drvdata(dev); | |
765 | struct hid_field *field; | |
766 | int offset; | |
767 | ||
768 | if (type == EV_FF) | |
769 | return input_ff_event(dev, type, code, value); | |
770 | ||
771 | if (type != EV_LED) | |
772 | return -1; | |
773 | ||
774 | offset = hidinput_find_field(hid, type, code, &field); | |
775 | ||
776 | if (offset == -1) { | |
777 | hid_warn(dev, "event field not found\n"); | |
778 | return -1; | |
779 | } | |
780 | ||
317b204a | 781 | return hid_set_field(field, offset, value); |
4a200c3b BT |
782 | } |
783 | ||
784 | static struct hid_ll_driver i2c_hid_ll_driver = { | |
785 | .parse = i2c_hid_parse, | |
786 | .start = i2c_hid_start, | |
787 | .stop = i2c_hid_stop, | |
788 | .open = i2c_hid_open, | |
789 | .close = i2c_hid_close, | |
790 | .power = i2c_hid_power, | |
545bef68 | 791 | .request = i2c_hid_request, |
4a200c3b BT |
792 | .hidinput_input_event = i2c_hid_hidinput_input_event, |
793 | }; | |
794 | ||
0fe763c5 | 795 | static int i2c_hid_init_irq(struct i2c_client *client) |
4a200c3b BT |
796 | { |
797 | struct i2c_hid *ihid = i2c_get_clientdata(client); | |
798 | int ret; | |
799 | ||
800 | dev_dbg(&client->dev, "Requesting IRQ: %d\n", client->irq); | |
801 | ||
802 | ret = request_threaded_irq(client->irq, NULL, i2c_hid_irq, | |
803 | IRQF_TRIGGER_FALLING | IRQF_ONESHOT, | |
804 | client->name, ihid); | |
805 | if (ret < 0) { | |
9972dcc2 | 806 | dev_warn(&client->dev, |
4a200c3b BT |
807 | "Could not register for %s interrupt, irq = %d," |
808 | " ret = %d\n", | |
9972dcc2 | 809 | client->name, client->irq, ret); |
4a200c3b BT |
810 | |
811 | return ret; | |
812 | } | |
813 | ||
4a200c3b BT |
814 | return 0; |
815 | } | |
816 | ||
0fe763c5 | 817 | static int i2c_hid_fetch_hid_descriptor(struct i2c_hid *ihid) |
4a200c3b BT |
818 | { |
819 | struct i2c_client *client = ihid->client; | |
820 | struct i2c_hid_desc *hdesc = &ihid->hdesc; | |
821 | unsigned int dsize; | |
822 | int ret; | |
823 | ||
824 | /* Fetch the length of HID description, retrieve the 4 first bytes: | |
825 | * bytes 0-1 -> length | |
826 | * bytes 2-3 -> bcdVersion (has to be 1.00) */ | |
827 | ret = i2c_hid_command(client, &hid_descr_cmd, ihid->hdesc_buffer, 4); | |
828 | ||
829 | i2c_hid_dbg(ihid, "%s, ihid->hdesc_buffer: %*ph\n", | |
830 | __func__, 4, ihid->hdesc_buffer); | |
831 | ||
832 | if (ret) { | |
9972dcc2 BT |
833 | dev_err(&client->dev, |
834 | "unable to fetch the size of HID descriptor (ret=%d)\n", | |
4a200c3b BT |
835 | ret); |
836 | return -ENODEV; | |
837 | } | |
838 | ||
839 | dsize = le16_to_cpu(hdesc->wHIDDescLength); | |
27174cff BT |
840 | /* |
841 | * the size of the HID descriptor should at least contain | |
842 | * its size and the bcdVersion (4 bytes), and should not be greater | |
843 | * than sizeof(struct i2c_hid_desc) as we directly fill this struct | |
844 | * through i2c_hid_command. | |
845 | */ | |
846 | if (dsize < 4 || dsize > sizeof(struct i2c_hid_desc)) { | |
4a200c3b BT |
847 | dev_err(&client->dev, "weird size of HID descriptor (%u)\n", |
848 | dsize); | |
849 | return -ENODEV; | |
850 | } | |
851 | ||
852 | /* check bcdVersion == 1.0 */ | |
853 | if (le16_to_cpu(hdesc->bcdVersion) != 0x0100) { | |
854 | dev_err(&client->dev, | |
9972dcc2 | 855 | "unexpected HID descriptor bcdVersion (0x%04hx)\n", |
4a200c3b BT |
856 | le16_to_cpu(hdesc->bcdVersion)); |
857 | return -ENODEV; | |
858 | } | |
859 | ||
860 | i2c_hid_dbg(ihid, "Fetching the HID descriptor\n"); | |
861 | ||
862 | ret = i2c_hid_command(client, &hid_descr_cmd, ihid->hdesc_buffer, | |
863 | dsize); | |
864 | if (ret) { | |
865 | dev_err(&client->dev, "hid_descr_cmd Fail\n"); | |
866 | return -ENODEV; | |
867 | } | |
868 | ||
869 | i2c_hid_dbg(ihid, "HID Descriptor: %*ph\n", dsize, ihid->hdesc_buffer); | |
870 | ||
871 | return 0; | |
872 | } | |
873 | ||
92241e67 MW |
874 | #ifdef CONFIG_ACPI |
875 | static int i2c_hid_acpi_pdata(struct i2c_client *client, | |
876 | struct i2c_hid_platform_data *pdata) | |
877 | { | |
878 | static u8 i2c_hid_guid[] = { | |
879 | 0xF7, 0xF6, 0xDF, 0x3C, 0x67, 0x42, 0x55, 0x45, | |
880 | 0xAD, 0x05, 0xB3, 0x0A, 0x3D, 0x89, 0x38, 0xDE, | |
881 | }; | |
882 | struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER, NULL }; | |
883 | union acpi_object params[4], *obj; | |
884 | struct acpi_object_list input; | |
885 | struct acpi_device *adev; | |
886 | acpi_handle handle; | |
887 | ||
888 | handle = ACPI_HANDLE(&client->dev); | |
889 | if (!handle || acpi_bus_get_device(handle, &adev)) | |
890 | return -ENODEV; | |
891 | ||
892 | input.count = ARRAY_SIZE(params); | |
893 | input.pointer = params; | |
894 | ||
895 | params[0].type = ACPI_TYPE_BUFFER; | |
896 | params[0].buffer.length = sizeof(i2c_hid_guid); | |
897 | params[0].buffer.pointer = i2c_hid_guid; | |
898 | params[1].type = ACPI_TYPE_INTEGER; | |
899 | params[1].integer.value = 1; | |
900 | params[2].type = ACPI_TYPE_INTEGER; | |
901 | params[2].integer.value = 1; /* HID function */ | |
902 | params[3].type = ACPI_TYPE_INTEGER; | |
903 | params[3].integer.value = 0; | |
904 | ||
905 | if (ACPI_FAILURE(acpi_evaluate_object(handle, "_DSM", &input, &buf))) { | |
906 | dev_err(&client->dev, "device _DSM execution failed\n"); | |
907 | return -ENODEV; | |
908 | } | |
909 | ||
910 | obj = (union acpi_object *)buf.pointer; | |
911 | if (obj->type != ACPI_TYPE_INTEGER) { | |
912 | dev_err(&client->dev, "device _DSM returned invalid type: %d\n", | |
913 | obj->type); | |
914 | kfree(buf.pointer); | |
915 | return -EINVAL; | |
916 | } | |
917 | ||
918 | pdata->hid_descriptor_address = obj->integer.value; | |
919 | ||
920 | kfree(buf.pointer); | |
921 | return 0; | |
922 | } | |
923 | ||
924 | static const struct acpi_device_id i2c_hid_acpi_match[] = { | |
925 | {"ACPI0C50", 0 }, | |
926 | {"PNP0C50", 0 }, | |
927 | { }, | |
928 | }; | |
929 | MODULE_DEVICE_TABLE(acpi, i2c_hid_acpi_match); | |
930 | #else | |
931 | static inline int i2c_hid_acpi_pdata(struct i2c_client *client, | |
932 | struct i2c_hid_platform_data *pdata) | |
933 | { | |
934 | return -ENODEV; | |
935 | } | |
936 | #endif | |
937 | ||
0fe763c5 GKH |
938 | static int i2c_hid_probe(struct i2c_client *client, |
939 | const struct i2c_device_id *dev_id) | |
4a200c3b BT |
940 | { |
941 | int ret; | |
942 | struct i2c_hid *ihid; | |
943 | struct hid_device *hid; | |
944 | __u16 hidRegister; | |
945 | struct i2c_hid_platform_data *platform_data = client->dev.platform_data; | |
946 | ||
947 | dbg_hid("HID probe called for i2c 0x%02x\n", client->addr); | |
948 | ||
4a200c3b BT |
949 | if (!client->irq) { |
950 | dev_err(&client->dev, | |
951 | "HID over i2c has not been provided an Int IRQ\n"); | |
952 | return -EINVAL; | |
953 | } | |
954 | ||
955 | ihid = kzalloc(sizeof(struct i2c_hid), GFP_KERNEL); | |
956 | if (!ihid) | |
957 | return -ENOMEM; | |
958 | ||
92241e67 MW |
959 | if (!platform_data) { |
960 | ret = i2c_hid_acpi_pdata(client, &ihid->pdata); | |
961 | if (ret) { | |
962 | dev_err(&client->dev, | |
963 | "HID register address not provided\n"); | |
964 | goto err; | |
965 | } | |
966 | } else { | |
967 | ihid->pdata = *platform_data; | |
968 | } | |
969 | ||
4a200c3b BT |
970 | i2c_set_clientdata(client, ihid); |
971 | ||
972 | ihid->client = client; | |
973 | ||
92241e67 | 974 | hidRegister = ihid->pdata.hid_descriptor_address; |
4a200c3b BT |
975 | ihid->wHIDDescRegister = cpu_to_le16(hidRegister); |
976 | ||
977 | init_waitqueue_head(&ihid->wait); | |
978 | ||
979 | /* we need to allocate the command buffer without knowing the maximum | |
980 | * size of the reports. Let's use HID_MIN_BUFFER_SIZE, then we do the | |
981 | * real computation later. */ | |
29b45787 BT |
982 | ret = i2c_hid_alloc_buffers(ihid, HID_MIN_BUFFER_SIZE); |
983 | if (ret < 0) | |
984 | goto err; | |
4a200c3b BT |
985 | |
986 | ret = i2c_hid_fetch_hid_descriptor(ihid); | |
987 | if (ret < 0) | |
988 | goto err; | |
989 | ||
990 | ret = i2c_hid_init_irq(client); | |
991 | if (ret < 0) | |
992 | goto err; | |
993 | ||
994 | hid = hid_allocate_device(); | |
995 | if (IS_ERR(hid)) { | |
996 | ret = PTR_ERR(hid); | |
8a1bbb53 | 997 | goto err_irq; |
4a200c3b BT |
998 | } |
999 | ||
1000 | ihid->hid = hid; | |
1001 | ||
1002 | hid->driver_data = client; | |
1003 | hid->ll_driver = &i2c_hid_ll_driver; | |
1004 | hid->hid_get_raw_report = i2c_hid_get_raw_report; | |
1005 | hid->hid_output_raw_report = i2c_hid_output_raw_report; | |
1006 | hid->dev.parent = &client->dev; | |
92241e67 | 1007 | ACPI_HANDLE_SET(&hid->dev, ACPI_HANDLE(&client->dev)); |
4a200c3b BT |
1008 | hid->bus = BUS_I2C; |
1009 | hid->version = le16_to_cpu(ihid->hdesc.bcdVersion); | |
1010 | hid->vendor = le16_to_cpu(ihid->hdesc.wVendorID); | |
1011 | hid->product = le16_to_cpu(ihid->hdesc.wProductID); | |
1012 | ||
9972dcc2 | 1013 | snprintf(hid->name, sizeof(hid->name), "%s %04hX:%04hX", |
4a200c3b BT |
1014 | client->name, hid->vendor, hid->product); |
1015 | ||
1016 | ret = hid_add_device(hid); | |
1017 | if (ret) { | |
1018 | if (ret != -ENODEV) | |
1019 | hid_err(client, "can't add hid device: %d\n", ret); | |
1020 | goto err_mem_free; | |
1021 | } | |
1022 | ||
1023 | return 0; | |
1024 | ||
1025 | err_mem_free: | |
1026 | hid_destroy_device(hid); | |
1027 | ||
8a1bbb53 BT |
1028 | err_irq: |
1029 | free_irq(client->irq, ihid); | |
4a200c3b | 1030 | |
8a1bbb53 | 1031 | err: |
3c626024 | 1032 | i2c_hid_free_buffers(ihid); |
4a200c3b BT |
1033 | kfree(ihid); |
1034 | return ret; | |
1035 | } | |
1036 | ||
0fe763c5 | 1037 | static int i2c_hid_remove(struct i2c_client *client) |
4a200c3b BT |
1038 | { |
1039 | struct i2c_hid *ihid = i2c_get_clientdata(client); | |
1040 | struct hid_device *hid; | |
1041 | ||
4a200c3b BT |
1042 | hid = ihid->hid; |
1043 | hid_destroy_device(hid); | |
1044 | ||
1045 | free_irq(client->irq, ihid); | |
1046 | ||
134ebfd8 BT |
1047 | if (ihid->bufsize) |
1048 | i2c_hid_free_buffers(ihid); | |
1049 | ||
4a200c3b BT |
1050 | kfree(ihid); |
1051 | ||
1052 | return 0; | |
1053 | } | |
1054 | ||
1055 | #ifdef CONFIG_PM_SLEEP | |
1056 | static int i2c_hid_suspend(struct device *dev) | |
1057 | { | |
1058 | struct i2c_client *client = to_i2c_client(dev); | |
4a200c3b BT |
1059 | |
1060 | if (device_may_wakeup(&client->dev)) | |
8a1bbb53 | 1061 | enable_irq_wake(client->irq); |
4a200c3b BT |
1062 | |
1063 | /* Save some power */ | |
1064 | i2c_hid_set_power(client, I2C_HID_PWR_SLEEP); | |
1065 | ||
1066 | return 0; | |
1067 | } | |
1068 | ||
1069 | static int i2c_hid_resume(struct device *dev) | |
1070 | { | |
1071 | int ret; | |
1072 | struct i2c_client *client = to_i2c_client(dev); | |
1073 | ||
1074 | ret = i2c_hid_hwreset(client); | |
1075 | if (ret) | |
1076 | return ret; | |
1077 | ||
1078 | if (device_may_wakeup(&client->dev)) | |
1079 | disable_irq_wake(client->irq); | |
1080 | ||
1081 | return 0; | |
1082 | } | |
1083 | #endif | |
1084 | ||
1085 | static SIMPLE_DEV_PM_OPS(i2c_hid_pm, i2c_hid_suspend, i2c_hid_resume); | |
1086 | ||
1087 | static const struct i2c_device_id i2c_hid_id_table[] = { | |
24ebb37e | 1088 | { "hid", 0 }, |
4a200c3b BT |
1089 | { }, |
1090 | }; | |
1091 | MODULE_DEVICE_TABLE(i2c, i2c_hid_id_table); | |
1092 | ||
1093 | ||
1094 | static struct i2c_driver i2c_hid_driver = { | |
1095 | .driver = { | |
1096 | .name = "i2c_hid", | |
1097 | .owner = THIS_MODULE, | |
1098 | .pm = &i2c_hid_pm, | |
92241e67 | 1099 | .acpi_match_table = ACPI_PTR(i2c_hid_acpi_match), |
4a200c3b BT |
1100 | }, |
1101 | ||
1102 | .probe = i2c_hid_probe, | |
0fe763c5 | 1103 | .remove = i2c_hid_remove, |
4a200c3b BT |
1104 | |
1105 | .id_table = i2c_hid_id_table, | |
1106 | }; | |
1107 | ||
1108 | module_i2c_driver(i2c_hid_driver); | |
1109 | ||
1110 | MODULE_DESCRIPTION("HID over I2C core driver"); | |
1111 | MODULE_AUTHOR("Benjamin Tissoires <benjamin.tissoires@gmail.com>"); | |
1112 | MODULE_LICENSE("GPL"); |