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> | |
34f439e4 | 28 | #include <linux/pm_runtime.h> |
4a200c3b BT |
29 | #include <linux/device.h> |
30 | #include <linux/wait.h> | |
31 | #include <linux/err.h> | |
32 | #include <linux/string.h> | |
33 | #include <linux/list.h> | |
34 | #include <linux/jiffies.h> | |
35 | #include <linux/kernel.h> | |
4a200c3b | 36 | #include <linux/hid.h> |
7a7d6d9c | 37 | #include <linux/mutex.h> |
92241e67 | 38 | #include <linux/acpi.h> |
3d7d248c | 39 | #include <linux/of.h> |
4a200c3b BT |
40 | |
41 | #include <linux/i2c/i2c-hid.h> | |
42 | ||
43 | /* flags */ | |
44 | #define I2C_HID_STARTED (1 << 0) | |
45 | #define I2C_HID_RESET_PENDING (1 << 1) | |
46 | #define I2C_HID_READ_PENDING (1 << 2) | |
47 | ||
48 | #define I2C_HID_PWR_ON 0x00 | |
49 | #define I2C_HID_PWR_SLEEP 0x01 | |
50 | ||
51 | /* debug option */ | |
ee8e8806 | 52 | static bool debug; |
4a200c3b BT |
53 | module_param(debug, bool, 0444); |
54 | MODULE_PARM_DESC(debug, "print a lot of debug information"); | |
55 | ||
fa738644 BT |
56 | #define i2c_hid_dbg(ihid, fmt, arg...) \ |
57 | do { \ | |
58 | if (debug) \ | |
59 | dev_printk(KERN_DEBUG, &(ihid)->client->dev, fmt, ##arg); \ | |
60 | } while (0) | |
4a200c3b BT |
61 | |
62 | struct i2c_hid_desc { | |
63 | __le16 wHIDDescLength; | |
64 | __le16 bcdVersion; | |
65 | __le16 wReportDescLength; | |
66 | __le16 wReportDescRegister; | |
67 | __le16 wInputRegister; | |
68 | __le16 wMaxInputLength; | |
69 | __le16 wOutputRegister; | |
70 | __le16 wMaxOutputLength; | |
71 | __le16 wCommandRegister; | |
72 | __le16 wDataRegister; | |
73 | __le16 wVendorID; | |
74 | __le16 wProductID; | |
75 | __le16 wVersionID; | |
27174cff | 76 | __le32 reserved; |
4a200c3b BT |
77 | } __packed; |
78 | ||
79 | struct i2c_hid_cmd { | |
80 | unsigned int registerIndex; | |
81 | __u8 opcode; | |
82 | unsigned int length; | |
83 | bool wait; | |
84 | }; | |
85 | ||
86 | union command { | |
87 | u8 data[0]; | |
88 | struct cmd { | |
89 | __le16 reg; | |
90 | __u8 reportTypeID; | |
91 | __u8 opcode; | |
92 | } __packed c; | |
93 | }; | |
94 | ||
95 | #define I2C_HID_CMD(opcode_) \ | |
96 | .opcode = opcode_, .length = 4, \ | |
97 | .registerIndex = offsetof(struct i2c_hid_desc, wCommandRegister) | |
98 | ||
99 | /* fetch HID descriptor */ | |
100 | static const struct i2c_hid_cmd hid_descr_cmd = { .length = 2 }; | |
101 | /* fetch report descriptors */ | |
102 | static const struct i2c_hid_cmd hid_report_descr_cmd = { | |
103 | .registerIndex = offsetof(struct i2c_hid_desc, | |
104 | wReportDescRegister), | |
105 | .opcode = 0x00, | |
106 | .length = 2 }; | |
107 | /* commands */ | |
108 | static const struct i2c_hid_cmd hid_reset_cmd = { I2C_HID_CMD(0x01), | |
109 | .wait = true }; | |
110 | static const struct i2c_hid_cmd hid_get_report_cmd = { I2C_HID_CMD(0x02) }; | |
111 | static const struct i2c_hid_cmd hid_set_report_cmd = { I2C_HID_CMD(0x03) }; | |
4a200c3b | 112 | static const struct i2c_hid_cmd hid_set_power_cmd = { I2C_HID_CMD(0x08) }; |
811adb96 | 113 | static const struct i2c_hid_cmd hid_no_cmd = { .length = 0 }; |
6bf6c8bf BT |
114 | |
115 | /* | |
116 | * These definitions are not used here, but are defined by the spec. | |
117 | * Keeping them here for documentation purposes. | |
118 | * | |
119 | * static const struct i2c_hid_cmd hid_get_idle_cmd = { I2C_HID_CMD(0x04) }; | |
120 | * static const struct i2c_hid_cmd hid_set_idle_cmd = { I2C_HID_CMD(0x05) }; | |
121 | * static const struct i2c_hid_cmd hid_get_protocol_cmd = { I2C_HID_CMD(0x06) }; | |
122 | * static const struct i2c_hid_cmd hid_set_protocol_cmd = { I2C_HID_CMD(0x07) }; | |
123 | */ | |
4a200c3b | 124 | |
7a7d6d9c BT |
125 | static DEFINE_MUTEX(i2c_hid_open_mut); |
126 | ||
4a200c3b BT |
127 | /* The main device structure */ |
128 | struct i2c_hid { | |
129 | struct i2c_client *client; /* i2c client */ | |
130 | struct hid_device *hid; /* pointer to corresponding HID dev */ | |
131 | union { | |
132 | __u8 hdesc_buffer[sizeof(struct i2c_hid_desc)]; | |
133 | struct i2c_hid_desc hdesc; /* the HID Descriptor */ | |
134 | }; | |
135 | __le16 wHIDDescRegister; /* location of the i2c | |
136 | * register of the HID | |
137 | * descriptor. */ | |
138 | unsigned int bufsize; /* i2c buffer size */ | |
139 | char *inbuf; /* Input buffer */ | |
140 | char *cmdbuf; /* Command buffer */ | |
141 | char *argsbuf; /* Command arguments buffer */ | |
142 | ||
143 | unsigned long flags; /* device flags */ | |
144 | ||
4a200c3b | 145 | wait_queue_head_t wait; /* For waiting the interrupt */ |
92241e67 MW |
146 | |
147 | struct i2c_hid_platform_data pdata; | |
4a200c3b BT |
148 | }; |
149 | ||
150 | static int __i2c_hid_command(struct i2c_client *client, | |
151 | const struct i2c_hid_cmd *command, u8 reportID, | |
152 | u8 reportType, u8 *args, int args_len, | |
153 | unsigned char *buf_recv, int data_len) | |
154 | { | |
155 | struct i2c_hid *ihid = i2c_get_clientdata(client); | |
156 | union command *cmd = (union command *)ihid->cmdbuf; | |
157 | int ret; | |
158 | struct i2c_msg msg[2]; | |
159 | int msg_num = 1; | |
160 | ||
161 | int length = command->length; | |
162 | bool wait = command->wait; | |
163 | unsigned int registerIndex = command->registerIndex; | |
164 | ||
165 | /* special case for hid_descr_cmd */ | |
166 | if (command == &hid_descr_cmd) { | |
167 | cmd->c.reg = ihid->wHIDDescRegister; | |
168 | } else { | |
169 | cmd->data[0] = ihid->hdesc_buffer[registerIndex]; | |
170 | cmd->data[1] = ihid->hdesc_buffer[registerIndex + 1]; | |
171 | } | |
172 | ||
173 | if (length > 2) { | |
174 | cmd->c.opcode = command->opcode; | |
175 | cmd->c.reportTypeID = reportID | reportType << 4; | |
176 | } | |
177 | ||
178 | memcpy(cmd->data + length, args, args_len); | |
179 | length += args_len; | |
180 | ||
181 | i2c_hid_dbg(ihid, "%s: cmd=%*ph\n", __func__, length, cmd->data); | |
182 | ||
183 | msg[0].addr = client->addr; | |
184 | msg[0].flags = client->flags & I2C_M_TEN; | |
185 | msg[0].len = length; | |
186 | msg[0].buf = cmd->data; | |
187 | if (data_len > 0) { | |
188 | msg[1].addr = client->addr; | |
189 | msg[1].flags = client->flags & I2C_M_TEN; | |
190 | msg[1].flags |= I2C_M_RD; | |
191 | msg[1].len = data_len; | |
192 | msg[1].buf = buf_recv; | |
193 | msg_num = 2; | |
194 | set_bit(I2C_HID_READ_PENDING, &ihid->flags); | |
195 | } | |
196 | ||
197 | if (wait) | |
198 | set_bit(I2C_HID_RESET_PENDING, &ihid->flags); | |
199 | ||
200 | ret = i2c_transfer(client->adapter, msg, msg_num); | |
201 | ||
202 | if (data_len > 0) | |
203 | clear_bit(I2C_HID_READ_PENDING, &ihid->flags); | |
204 | ||
205 | if (ret != msg_num) | |
206 | return ret < 0 ? ret : -EIO; | |
207 | ||
208 | ret = 0; | |
209 | ||
210 | if (wait) { | |
211 | i2c_hid_dbg(ihid, "%s: waiting...\n", __func__); | |
212 | if (!wait_event_timeout(ihid->wait, | |
213 | !test_bit(I2C_HID_RESET_PENDING, &ihid->flags), | |
214 | msecs_to_jiffies(5000))) | |
215 | ret = -ENODATA; | |
216 | i2c_hid_dbg(ihid, "%s: finished.\n", __func__); | |
217 | } | |
218 | ||
219 | return ret; | |
220 | } | |
221 | ||
222 | static int i2c_hid_command(struct i2c_client *client, | |
223 | const struct i2c_hid_cmd *command, | |
224 | unsigned char *buf_recv, int data_len) | |
225 | { | |
226 | return __i2c_hid_command(client, command, 0, 0, NULL, 0, | |
227 | buf_recv, data_len); | |
228 | } | |
229 | ||
230 | static int i2c_hid_get_report(struct i2c_client *client, u8 reportType, | |
231 | u8 reportID, unsigned char *buf_recv, int data_len) | |
232 | { | |
233 | struct i2c_hid *ihid = i2c_get_clientdata(client); | |
234 | u8 args[3]; | |
235 | int ret; | |
236 | int args_len = 0; | |
237 | u16 readRegister = le16_to_cpu(ihid->hdesc.wDataRegister); | |
238 | ||
239 | i2c_hid_dbg(ihid, "%s\n", __func__); | |
240 | ||
241 | if (reportID >= 0x0F) { | |
242 | args[args_len++] = reportID; | |
243 | reportID = 0x0F; | |
244 | } | |
245 | ||
246 | args[args_len++] = readRegister & 0xFF; | |
247 | args[args_len++] = readRegister >> 8; | |
248 | ||
249 | ret = __i2c_hid_command(client, &hid_get_report_cmd, reportID, | |
250 | reportType, args, args_len, buf_recv, data_len); | |
251 | if (ret) { | |
252 | dev_err(&client->dev, | |
253 | "failed to retrieve report from device.\n"); | |
317b204a | 254 | return ret; |
4a200c3b BT |
255 | } |
256 | ||
257 | return 0; | |
258 | } | |
259 | ||
9b5a9ae8 BT |
260 | /** |
261 | * i2c_hid_set_or_send_report: forward an incoming report to the device | |
262 | * @client: the i2c_client of the device | |
263 | * @reportType: 0x03 for HID_FEATURE_REPORT ; 0x02 for HID_OUTPUT_REPORT | |
264 | * @reportID: the report ID | |
265 | * @buf: the actual data to transfer, without the report ID | |
266 | * @len: size of buf | |
267 | * @use_data: true: use SET_REPORT HID command, false: send plain OUTPUT report | |
268 | */ | |
269 | static int i2c_hid_set_or_send_report(struct i2c_client *client, u8 reportType, | |
270 | u8 reportID, unsigned char *buf, size_t data_len, bool use_data) | |
4a200c3b BT |
271 | { |
272 | struct i2c_hid *ihid = i2c_get_clientdata(client); | |
273 | u8 *args = ihid->argsbuf; | |
9b5a9ae8 | 274 | const struct i2c_hid_cmd *hidcmd; |
4a200c3b BT |
275 | int ret; |
276 | u16 dataRegister = le16_to_cpu(ihid->hdesc.wDataRegister); | |
811adb96 AD |
277 | u16 outputRegister = le16_to_cpu(ihid->hdesc.wOutputRegister); |
278 | u16 maxOutputLength = le16_to_cpu(ihid->hdesc.wMaxOutputLength); | |
4a200c3b | 279 | |
53182517 | 280 | /* hid_hw_* already checked that data_len < HID_MAX_BUFFER_SIZE */ |
4a200c3b BT |
281 | u16 size = 2 /* size */ + |
282 | (reportID ? 1 : 0) /* reportID */ + | |
283 | data_len /* buf */; | |
284 | int args_len = (reportID >= 0x0F ? 1 : 0) /* optional third byte */ + | |
285 | 2 /* dataRegister */ + | |
286 | size /* args */; | |
287 | int index = 0; | |
288 | ||
289 | i2c_hid_dbg(ihid, "%s\n", __func__); | |
290 | ||
9b5a9ae8 BT |
291 | if (!use_data && maxOutputLength == 0) |
292 | return -ENOSYS; | |
293 | ||
4a200c3b BT |
294 | if (reportID >= 0x0F) { |
295 | args[index++] = reportID; | |
296 | reportID = 0x0F; | |
297 | } | |
298 | ||
811adb96 AD |
299 | /* |
300 | * use the data register for feature reports or if the device does not | |
301 | * support the output register | |
302 | */ | |
9b5a9ae8 | 303 | if (use_data) { |
811adb96 AD |
304 | args[index++] = dataRegister & 0xFF; |
305 | args[index++] = dataRegister >> 8; | |
9b5a9ae8 | 306 | hidcmd = &hid_set_report_cmd; |
811adb96 AD |
307 | } else { |
308 | args[index++] = outputRegister & 0xFF; | |
309 | args[index++] = outputRegister >> 8; | |
310 | hidcmd = &hid_no_cmd; | |
311 | } | |
4a200c3b BT |
312 | |
313 | args[index++] = size & 0xFF; | |
314 | args[index++] = size >> 8; | |
315 | ||
316 | if (reportID) | |
317 | args[index++] = reportID; | |
318 | ||
319 | memcpy(&args[index], buf, data_len); | |
320 | ||
811adb96 | 321 | ret = __i2c_hid_command(client, hidcmd, reportID, |
4a200c3b BT |
322 | reportType, args, args_len, NULL, 0); |
323 | if (ret) { | |
324 | dev_err(&client->dev, "failed to set a report to device.\n"); | |
317b204a | 325 | return ret; |
4a200c3b BT |
326 | } |
327 | ||
328 | return data_len; | |
329 | } | |
330 | ||
331 | static int i2c_hid_set_power(struct i2c_client *client, int power_state) | |
332 | { | |
333 | struct i2c_hid *ihid = i2c_get_clientdata(client); | |
334 | int ret; | |
335 | ||
336 | i2c_hid_dbg(ihid, "%s\n", __func__); | |
337 | ||
338 | ret = __i2c_hid_command(client, &hid_set_power_cmd, power_state, | |
339 | 0, NULL, 0, NULL, 0); | |
340 | if (ret) | |
341 | dev_err(&client->dev, "failed to change power setting.\n"); | |
342 | ||
343 | return ret; | |
344 | } | |
345 | ||
346 | static int i2c_hid_hwreset(struct i2c_client *client) | |
347 | { | |
348 | struct i2c_hid *ihid = i2c_get_clientdata(client); | |
349 | int ret; | |
350 | ||
351 | i2c_hid_dbg(ihid, "%s\n", __func__); | |
352 | ||
353 | ret = i2c_hid_set_power(client, I2C_HID_PWR_ON); | |
354 | if (ret) | |
355 | return ret; | |
356 | ||
357 | i2c_hid_dbg(ihid, "resetting...\n"); | |
358 | ||
359 | ret = i2c_hid_command(client, &hid_reset_cmd, NULL, 0); | |
360 | if (ret) { | |
361 | dev_err(&client->dev, "failed to reset device.\n"); | |
362 | i2c_hid_set_power(client, I2C_HID_PWR_SLEEP); | |
363 | return ret; | |
364 | } | |
365 | ||
366 | return 0; | |
367 | } | |
368 | ||
317b204a | 369 | static void i2c_hid_get_input(struct i2c_hid *ihid) |
4a200c3b BT |
370 | { |
371 | int ret, ret_size; | |
372 | int size = le16_to_cpu(ihid->hdesc.wMaxInputLength); | |
373 | ||
374 | ret = i2c_master_recv(ihid->client, ihid->inbuf, size); | |
375 | if (ret != size) { | |
376 | if (ret < 0) | |
317b204a | 377 | return; |
4a200c3b BT |
378 | |
379 | dev_err(&ihid->client->dev, "%s: got %d data instead of %d\n", | |
380 | __func__, ret, size); | |
317b204a | 381 | return; |
4a200c3b BT |
382 | } |
383 | ||
384 | ret_size = ihid->inbuf[0] | ihid->inbuf[1] << 8; | |
385 | ||
386 | if (!ret_size) { | |
387 | /* host or device initiated RESET completed */ | |
388 | if (test_and_clear_bit(I2C_HID_RESET_PENDING, &ihid->flags)) | |
389 | wake_up(&ihid->wait); | |
317b204a | 390 | return; |
4a200c3b BT |
391 | } |
392 | ||
393 | if (ret_size > size) { | |
394 | dev_err(&ihid->client->dev, "%s: incomplete report (%d/%d)\n", | |
395 | __func__, size, ret_size); | |
317b204a | 396 | return; |
4a200c3b BT |
397 | } |
398 | ||
399 | i2c_hid_dbg(ihid, "input: %*ph\n", ret_size, ihid->inbuf); | |
400 | ||
401 | if (test_bit(I2C_HID_STARTED, &ihid->flags)) | |
402 | hid_input_report(ihid->hid, HID_INPUT_REPORT, ihid->inbuf + 2, | |
403 | ret_size - 2, 1); | |
404 | ||
317b204a | 405 | return; |
4a200c3b BT |
406 | } |
407 | ||
408 | static irqreturn_t i2c_hid_irq(int irq, void *dev_id) | |
409 | { | |
410 | struct i2c_hid *ihid = dev_id; | |
411 | ||
412 | if (test_bit(I2C_HID_READ_PENDING, &ihid->flags)) | |
413 | return IRQ_HANDLED; | |
414 | ||
415 | i2c_hid_get_input(ihid); | |
416 | ||
417 | return IRQ_HANDLED; | |
418 | } | |
419 | ||
420 | static int i2c_hid_get_report_length(struct hid_report *report) | |
421 | { | |
422 | return ((report->size - 1) >> 3) + 1 + | |
423 | report->device->report_enum[report->type].numbered + 2; | |
424 | } | |
425 | ||
426 | static void i2c_hid_init_report(struct hid_report *report, u8 *buffer, | |
427 | size_t bufsize) | |
428 | { | |
429 | struct hid_device *hid = report->device; | |
430 | struct i2c_client *client = hid->driver_data; | |
431 | struct i2c_hid *ihid = i2c_get_clientdata(client); | |
432 | unsigned int size, ret_size; | |
433 | ||
434 | size = i2c_hid_get_report_length(report); | |
c737bcf9 | 435 | if (i2c_hid_get_report(client, |
4a200c3b | 436 | report->type == HID_FEATURE_REPORT ? 0x03 : 0x01, |
c737bcf9 BT |
437 | report->id, buffer, size)) |
438 | return; | |
4a200c3b BT |
439 | |
440 | i2c_hid_dbg(ihid, "report (len=%d): %*ph\n", size, size, ihid->inbuf); | |
441 | ||
442 | ret_size = buffer[0] | (buffer[1] << 8); | |
443 | ||
444 | if (ret_size != size) { | |
445 | dev_err(&client->dev, "error in %s size:%d / ret_size:%d\n", | |
446 | __func__, size, ret_size); | |
447 | return; | |
448 | } | |
449 | ||
450 | /* hid->driver_lock is held as we are in probe function, | |
451 | * we just need to setup the input fields, so using | |
452 | * hid_report_raw_event is safe. */ | |
453 | hid_report_raw_event(hid, report->type, buffer + 2, size - 2, 1); | |
454 | } | |
455 | ||
456 | /* | |
457 | * Initialize all reports | |
458 | */ | |
459 | static void i2c_hid_init_reports(struct hid_device *hid) | |
460 | { | |
461 | struct hid_report *report; | |
462 | struct i2c_client *client = hid->driver_data; | |
463 | struct i2c_hid *ihid = i2c_get_clientdata(client); | |
464 | u8 *inbuf = kzalloc(ihid->bufsize, GFP_KERNEL); | |
465 | ||
317b204a BT |
466 | if (!inbuf) { |
467 | dev_err(&client->dev, "can not retrieve initial reports\n"); | |
4a200c3b | 468 | return; |
317b204a | 469 | } |
4a200c3b | 470 | |
34f439e4 MW |
471 | /* |
472 | * The device must be powered on while we fetch initial reports | |
473 | * from it. | |
474 | */ | |
475 | pm_runtime_get_sync(&client->dev); | |
476 | ||
4a200c3b BT |
477 | list_for_each_entry(report, |
478 | &hid->report_enum[HID_FEATURE_REPORT].report_list, list) | |
479 | i2c_hid_init_report(report, inbuf, ihid->bufsize); | |
480 | ||
34f439e4 MW |
481 | pm_runtime_put(&client->dev); |
482 | ||
4a200c3b BT |
483 | kfree(inbuf); |
484 | } | |
485 | ||
486 | /* | |
487 | * Traverse the supplied list of reports and find the longest | |
488 | */ | |
489 | static void i2c_hid_find_max_report(struct hid_device *hid, unsigned int type, | |
490 | unsigned int *max) | |
491 | { | |
492 | struct hid_report *report; | |
493 | unsigned int size; | |
494 | ||
495 | /* We should not rely on wMaxInputLength, as some devices may set it to | |
496 | * a wrong length. */ | |
497 | list_for_each_entry(report, &hid->report_enum[type].report_list, list) { | |
498 | size = i2c_hid_get_report_length(report); | |
499 | if (*max < size) | |
500 | *max = size; | |
501 | } | |
502 | } | |
503 | ||
29b45787 BT |
504 | static void i2c_hid_free_buffers(struct i2c_hid *ihid) |
505 | { | |
506 | kfree(ihid->inbuf); | |
507 | kfree(ihid->argsbuf); | |
508 | kfree(ihid->cmdbuf); | |
509 | ihid->inbuf = NULL; | |
510 | ihid->cmdbuf = NULL; | |
511 | ihid->argsbuf = NULL; | |
512 | ihid->bufsize = 0; | |
513 | } | |
514 | ||
515 | static int i2c_hid_alloc_buffers(struct i2c_hid *ihid, size_t report_size) | |
4a200c3b BT |
516 | { |
517 | /* the worst case is computed from the set_report command with a | |
518 | * reportID > 15 and the maximum report length */ | |
519 | int args_len = sizeof(__u8) + /* optional ReportID byte */ | |
520 | sizeof(__u16) + /* data register */ | |
521 | sizeof(__u16) + /* size of the report */ | |
29b45787 | 522 | report_size; /* report */ |
4a200c3b | 523 | |
29b45787 | 524 | ihid->inbuf = kzalloc(report_size, GFP_KERNEL); |
4a200c3b | 525 | ihid->argsbuf = kzalloc(args_len, GFP_KERNEL); |
4a200c3b BT |
526 | ihid->cmdbuf = kzalloc(sizeof(union command) + args_len, GFP_KERNEL); |
527 | ||
29b45787 BT |
528 | if (!ihid->inbuf || !ihid->argsbuf || !ihid->cmdbuf) { |
529 | i2c_hid_free_buffers(ihid); | |
4a200c3b BT |
530 | return -ENOMEM; |
531 | } | |
532 | ||
29b45787 | 533 | ihid->bufsize = report_size; |
4a200c3b | 534 | |
29b45787 | 535 | return 0; |
4a200c3b BT |
536 | } |
537 | ||
538 | static int i2c_hid_get_raw_report(struct hid_device *hid, | |
539 | unsigned char report_number, __u8 *buf, size_t count, | |
540 | unsigned char report_type) | |
541 | { | |
542 | struct i2c_client *client = hid->driver_data; | |
543 | struct i2c_hid *ihid = i2c_get_clientdata(client); | |
e5b50fe7 | 544 | size_t ret_count, ask_count; |
4a200c3b BT |
545 | int ret; |
546 | ||
547 | if (report_type == HID_OUTPUT_REPORT) | |
548 | return -EINVAL; | |
549 | ||
e5b50fe7 BT |
550 | /* +2 bytes to include the size of the reply in the query buffer */ |
551 | ask_count = min(count + 2, (size_t)ihid->bufsize); | |
4a200c3b BT |
552 | |
553 | ret = i2c_hid_get_report(client, | |
554 | report_type == HID_FEATURE_REPORT ? 0x03 : 0x01, | |
e5b50fe7 | 555 | report_number, ihid->inbuf, ask_count); |
4a200c3b BT |
556 | |
557 | if (ret < 0) | |
558 | return ret; | |
559 | ||
e5b50fe7 | 560 | ret_count = ihid->inbuf[0] | (ihid->inbuf[1] << 8); |
4a200c3b | 561 | |
9afd09a1 | 562 | if (ret_count <= 2) |
e5b50fe7 BT |
563 | return 0; |
564 | ||
565 | ret_count = min(ret_count, ask_count); | |
566 | ||
567 | /* The query buffer contains the size, dropping it in the reply */ | |
568 | count = min(count, ret_count - 2); | |
4a200c3b BT |
569 | memcpy(buf, ihid->inbuf + 2, count); |
570 | ||
571 | return count; | |
572 | } | |
573 | ||
574 | static int i2c_hid_output_raw_report(struct hid_device *hid, __u8 *buf, | |
9b5a9ae8 | 575 | size_t count, unsigned char report_type, bool use_data) |
4a200c3b BT |
576 | { |
577 | struct i2c_client *client = hid->driver_data; | |
578 | int report_id = buf[0]; | |
c284979a | 579 | int ret; |
4a200c3b BT |
580 | |
581 | if (report_type == HID_INPUT_REPORT) | |
582 | return -EINVAL; | |
583 | ||
c284979a BT |
584 | if (report_id) { |
585 | buf++; | |
586 | count--; | |
587 | } | |
588 | ||
9b5a9ae8 | 589 | ret = i2c_hid_set_or_send_report(client, |
4a200c3b | 590 | report_type == HID_FEATURE_REPORT ? 0x03 : 0x02, |
9b5a9ae8 | 591 | report_id, buf, count, use_data); |
c284979a BT |
592 | |
593 | if (report_id && ret >= 0) | |
594 | ret++; /* add report_id to the number of transfered bytes */ | |
595 | ||
596 | return ret; | |
4a200c3b BT |
597 | } |
598 | ||
9b5a9ae8 BT |
599 | static int i2c_hid_output_report(struct hid_device *hid, __u8 *buf, |
600 | size_t count) | |
545bef68 | 601 | { |
9b5a9ae8 BT |
602 | return i2c_hid_output_raw_report(hid, buf, count, HID_OUTPUT_REPORT, |
603 | false); | |
604 | } | |
545bef68 | 605 | |
9b5a9ae8 BT |
606 | static int i2c_hid_raw_request(struct hid_device *hid, unsigned char reportnum, |
607 | __u8 *buf, size_t len, unsigned char rtype, | |
608 | int reqtype) | |
609 | { | |
545bef68 BT |
610 | switch (reqtype) { |
611 | case HID_REQ_GET_REPORT: | |
9b5a9ae8 | 612 | return i2c_hid_get_raw_report(hid, reportnum, buf, len, rtype); |
545bef68 | 613 | case HID_REQ_SET_REPORT: |
9b5a9ae8 BT |
614 | if (buf[0] != reportnum) |
615 | return -EINVAL; | |
616 | return i2c_hid_output_raw_report(hid, buf, len, rtype, true); | |
617 | default: | |
618 | return -EIO; | |
545bef68 | 619 | } |
545bef68 BT |
620 | } |
621 | ||
4a200c3b BT |
622 | static int i2c_hid_parse(struct hid_device *hid) |
623 | { | |
624 | struct i2c_client *client = hid->driver_data; | |
625 | struct i2c_hid *ihid = i2c_get_clientdata(client); | |
626 | struct i2c_hid_desc *hdesc = &ihid->hdesc; | |
627 | unsigned int rsize; | |
628 | char *rdesc; | |
629 | int ret; | |
630 | int tries = 3; | |
631 | ||
632 | i2c_hid_dbg(ihid, "entering %s\n", __func__); | |
633 | ||
634 | rsize = le16_to_cpu(hdesc->wReportDescLength); | |
635 | if (!rsize || rsize > HID_MAX_DESCRIPTOR_SIZE) { | |
636 | dbg_hid("weird size of report descriptor (%u)\n", rsize); | |
637 | return -EINVAL; | |
638 | } | |
639 | ||
640 | do { | |
641 | ret = i2c_hid_hwreset(client); | |
642 | if (ret) | |
643 | msleep(1000); | |
644 | } while (tries-- > 0 && ret); | |
645 | ||
646 | if (ret) | |
647 | return ret; | |
648 | ||
649 | rdesc = kzalloc(rsize, GFP_KERNEL); | |
650 | ||
651 | if (!rdesc) { | |
652 | dbg_hid("couldn't allocate rdesc memory\n"); | |
653 | return -ENOMEM; | |
654 | } | |
655 | ||
656 | i2c_hid_dbg(ihid, "asking HID report descriptor\n"); | |
657 | ||
658 | ret = i2c_hid_command(client, &hid_report_descr_cmd, rdesc, rsize); | |
659 | if (ret) { | |
660 | hid_err(hid, "reading report descriptor failed\n"); | |
661 | kfree(rdesc); | |
662 | return -EIO; | |
663 | } | |
664 | ||
665 | i2c_hid_dbg(ihid, "Report Descriptor: %*ph\n", rsize, rdesc); | |
666 | ||
667 | ret = hid_parse_report(hid, rdesc, rsize); | |
668 | kfree(rdesc); | |
669 | if (ret) { | |
670 | dbg_hid("parsing report descriptor failed\n"); | |
671 | return ret; | |
672 | } | |
673 | ||
674 | return 0; | |
675 | } | |
676 | ||
677 | static int i2c_hid_start(struct hid_device *hid) | |
678 | { | |
679 | struct i2c_client *client = hid->driver_data; | |
680 | struct i2c_hid *ihid = i2c_get_clientdata(client); | |
681 | int ret; | |
29b45787 | 682 | unsigned int bufsize = HID_MIN_BUFFER_SIZE; |
4a200c3b | 683 | |
29b45787 BT |
684 | i2c_hid_find_max_report(hid, HID_INPUT_REPORT, &bufsize); |
685 | i2c_hid_find_max_report(hid, HID_OUTPUT_REPORT, &bufsize); | |
686 | i2c_hid_find_max_report(hid, HID_FEATURE_REPORT, &bufsize); | |
4a200c3b | 687 | |
29b45787 | 688 | if (bufsize > ihid->bufsize) { |
4a200c3b BT |
689 | i2c_hid_free_buffers(ihid); |
690 | ||
29b45787 | 691 | ret = i2c_hid_alloc_buffers(ihid, bufsize); |
4a200c3b | 692 | |
29b45787 | 693 | if (ret) |
4a200c3b | 694 | return ret; |
4a200c3b BT |
695 | } |
696 | ||
697 | if (!(hid->quirks & HID_QUIRK_NO_INIT_REPORTS)) | |
698 | i2c_hid_init_reports(hid); | |
699 | ||
700 | return 0; | |
701 | } | |
702 | ||
703 | static void i2c_hid_stop(struct hid_device *hid) | |
704 | { | |
705 | struct i2c_client *client = hid->driver_data; | |
706 | struct i2c_hid *ihid = i2c_get_clientdata(client); | |
707 | ||
708 | hid->claimed = 0; | |
709 | ||
710 | i2c_hid_free_buffers(ihid); | |
711 | } | |
712 | ||
713 | static int i2c_hid_open(struct hid_device *hid) | |
714 | { | |
715 | struct i2c_client *client = hid->driver_data; | |
716 | struct i2c_hid *ihid = i2c_get_clientdata(client); | |
7a7d6d9c | 717 | int ret = 0; |
4a200c3b | 718 | |
7a7d6d9c | 719 | mutex_lock(&i2c_hid_open_mut); |
4a200c3b | 720 | if (!hid->open++) { |
34f439e4 MW |
721 | ret = pm_runtime_get_sync(&client->dev); |
722 | if (ret < 0) { | |
4a200c3b | 723 | hid->open--; |
7a7d6d9c | 724 | goto done; |
4a200c3b BT |
725 | } |
726 | set_bit(I2C_HID_STARTED, &ihid->flags); | |
727 | } | |
7a7d6d9c BT |
728 | done: |
729 | mutex_unlock(&i2c_hid_open_mut); | |
34f439e4 | 730 | return ret < 0 ? ret : 0; |
4a200c3b BT |
731 | } |
732 | ||
733 | static void i2c_hid_close(struct hid_device *hid) | |
734 | { | |
735 | struct i2c_client *client = hid->driver_data; | |
736 | struct i2c_hid *ihid = i2c_get_clientdata(client); | |
737 | ||
738 | /* protecting hid->open to make sure we don't restart | |
739 | * data acquistion due to a resumption we no longer | |
740 | * care about | |
741 | */ | |
7a7d6d9c | 742 | mutex_lock(&i2c_hid_open_mut); |
4a200c3b BT |
743 | if (!--hid->open) { |
744 | clear_bit(I2C_HID_STARTED, &ihid->flags); | |
745 | ||
746 | /* Save some power */ | |
34f439e4 | 747 | pm_runtime_put(&client->dev); |
4a200c3b | 748 | } |
7a7d6d9c | 749 | mutex_unlock(&i2c_hid_open_mut); |
4a200c3b BT |
750 | } |
751 | ||
752 | static int i2c_hid_power(struct hid_device *hid, int lvl) | |
753 | { | |
754 | struct i2c_client *client = hid->driver_data; | |
755 | struct i2c_hid *ihid = i2c_get_clientdata(client); | |
4a200c3b BT |
756 | |
757 | i2c_hid_dbg(ihid, "%s lvl:%d\n", __func__, lvl); | |
758 | ||
759 | switch (lvl) { | |
760 | case PM_HINT_FULLON: | |
34f439e4 | 761 | pm_runtime_get_sync(&client->dev); |
4a200c3b BT |
762 | break; |
763 | case PM_HINT_NORMAL: | |
34f439e4 | 764 | pm_runtime_put(&client->dev); |
4a200c3b BT |
765 | break; |
766 | } | |
34f439e4 | 767 | return 0; |
4a200c3b BT |
768 | } |
769 | ||
4a200c3b BT |
770 | static struct hid_ll_driver i2c_hid_ll_driver = { |
771 | .parse = i2c_hid_parse, | |
772 | .start = i2c_hid_start, | |
773 | .stop = i2c_hid_stop, | |
774 | .open = i2c_hid_open, | |
775 | .close = i2c_hid_close, | |
776 | .power = i2c_hid_power, | |
9b5a9ae8 BT |
777 | .output_report = i2c_hid_output_report, |
778 | .raw_request = i2c_hid_raw_request, | |
4a200c3b BT |
779 | }; |
780 | ||
0fe763c5 | 781 | static int i2c_hid_init_irq(struct i2c_client *client) |
4a200c3b BT |
782 | { |
783 | struct i2c_hid *ihid = i2c_get_clientdata(client); | |
784 | int ret; | |
785 | ||
786 | dev_dbg(&client->dev, "Requesting IRQ: %d\n", client->irq); | |
787 | ||
788 | ret = request_threaded_irq(client->irq, NULL, i2c_hid_irq, | |
789 | IRQF_TRIGGER_FALLING | IRQF_ONESHOT, | |
790 | client->name, ihid); | |
791 | if (ret < 0) { | |
9972dcc2 | 792 | dev_warn(&client->dev, |
4a200c3b BT |
793 | "Could not register for %s interrupt, irq = %d," |
794 | " ret = %d\n", | |
9972dcc2 | 795 | client->name, client->irq, ret); |
4a200c3b BT |
796 | |
797 | return ret; | |
798 | } | |
799 | ||
4a200c3b BT |
800 | return 0; |
801 | } | |
802 | ||
0fe763c5 | 803 | static int i2c_hid_fetch_hid_descriptor(struct i2c_hid *ihid) |
4a200c3b BT |
804 | { |
805 | struct i2c_client *client = ihid->client; | |
806 | struct i2c_hid_desc *hdesc = &ihid->hdesc; | |
807 | unsigned int dsize; | |
808 | int ret; | |
809 | ||
f58b8487 AP |
810 | /* i2c hid fetch using a fixed descriptor size (30 bytes) */ |
811 | i2c_hid_dbg(ihid, "Fetching the HID descriptor\n"); | |
812 | ret = i2c_hid_command(client, &hid_descr_cmd, ihid->hdesc_buffer, | |
813 | sizeof(struct i2c_hid_desc)); | |
4a200c3b | 814 | if (ret) { |
f58b8487 | 815 | dev_err(&client->dev, "hid_descr_cmd failed\n"); |
4a200c3b BT |
816 | return -ENODEV; |
817 | } | |
818 | ||
f58b8487 AP |
819 | /* Validate the length of HID descriptor, the 4 first bytes: |
820 | * bytes 0-1 -> length | |
821 | * bytes 2-3 -> bcdVersion (has to be 1.00) */ | |
4a200c3b BT |
822 | /* check bcdVersion == 1.0 */ |
823 | if (le16_to_cpu(hdesc->bcdVersion) != 0x0100) { | |
824 | dev_err(&client->dev, | |
9972dcc2 | 825 | "unexpected HID descriptor bcdVersion (0x%04hx)\n", |
4a200c3b BT |
826 | le16_to_cpu(hdesc->bcdVersion)); |
827 | return -ENODEV; | |
828 | } | |
829 | ||
f58b8487 AP |
830 | /* Descriptor length should be 30 bytes as per the specification */ |
831 | dsize = le16_to_cpu(hdesc->wHIDDescLength); | |
832 | if (dsize != sizeof(struct i2c_hid_desc)) { | |
833 | dev_err(&client->dev, "weird size of HID descriptor (%u)\n", | |
834 | dsize); | |
4a200c3b BT |
835 | return -ENODEV; |
836 | } | |
4a200c3b | 837 | i2c_hid_dbg(ihid, "HID Descriptor: %*ph\n", dsize, ihid->hdesc_buffer); |
4a200c3b BT |
838 | return 0; |
839 | } | |
840 | ||
92241e67 MW |
841 | #ifdef CONFIG_ACPI |
842 | static int i2c_hid_acpi_pdata(struct i2c_client *client, | |
843 | struct i2c_hid_platform_data *pdata) | |
844 | { | |
845 | static u8 i2c_hid_guid[] = { | |
846 | 0xF7, 0xF6, 0xDF, 0x3C, 0x67, 0x42, 0x55, 0x45, | |
847 | 0xAD, 0x05, 0xB3, 0x0A, 0x3D, 0x89, 0x38, 0xDE, | |
848 | }; | |
ea547d7d | 849 | union acpi_object *obj; |
92241e67 MW |
850 | struct acpi_device *adev; |
851 | acpi_handle handle; | |
852 | ||
853 | handle = ACPI_HANDLE(&client->dev); | |
854 | if (!handle || acpi_bus_get_device(handle, &adev)) | |
855 | return -ENODEV; | |
856 | ||
ea547d7d JL |
857 | obj = acpi_evaluate_dsm_typed(handle, i2c_hid_guid, 1, 1, NULL, |
858 | ACPI_TYPE_INTEGER); | |
859 | if (!obj) { | |
92241e67 MW |
860 | dev_err(&client->dev, "device _DSM execution failed\n"); |
861 | return -ENODEV; | |
862 | } | |
863 | ||
ea547d7d JL |
864 | pdata->hid_descriptor_address = obj->integer.value; |
865 | ACPI_FREE(obj); | |
92241e67 | 866 | |
92241e67 MW |
867 | return 0; |
868 | } | |
869 | ||
870 | static const struct acpi_device_id i2c_hid_acpi_match[] = { | |
871 | {"ACPI0C50", 0 }, | |
872 | {"PNP0C50", 0 }, | |
873 | { }, | |
874 | }; | |
875 | MODULE_DEVICE_TABLE(acpi, i2c_hid_acpi_match); | |
876 | #else | |
877 | static inline int i2c_hid_acpi_pdata(struct i2c_client *client, | |
878 | struct i2c_hid_platform_data *pdata) | |
879 | { | |
880 | return -ENODEV; | |
881 | } | |
882 | #endif | |
883 | ||
3d7d248c BT |
884 | #ifdef CONFIG_OF |
885 | static int i2c_hid_of_probe(struct i2c_client *client, | |
886 | struct i2c_hid_platform_data *pdata) | |
887 | { | |
888 | struct device *dev = &client->dev; | |
889 | u32 val; | |
890 | int ret; | |
891 | ||
892 | ret = of_property_read_u32(dev->of_node, "hid-descr-addr", &val); | |
893 | if (ret) { | |
894 | dev_err(&client->dev, "HID register address not provided\n"); | |
895 | return -ENODEV; | |
896 | } | |
897 | if (val >> 16) { | |
898 | dev_err(&client->dev, "Bad HID register address: 0x%08x\n", | |
899 | val); | |
900 | return -EINVAL; | |
901 | } | |
902 | pdata->hid_descriptor_address = val; | |
903 | ||
904 | return 0; | |
905 | } | |
906 | ||
907 | static const struct of_device_id i2c_hid_of_match[] = { | |
908 | { .compatible = "hid-over-i2c" }, | |
909 | {}, | |
910 | }; | |
911 | MODULE_DEVICE_TABLE(of, i2c_hid_of_match); | |
912 | #else | |
913 | static inline int i2c_hid_of_probe(struct i2c_client *client, | |
914 | struct i2c_hid_platform_data *pdata) | |
915 | { | |
916 | return -ENODEV; | |
917 | } | |
918 | #endif | |
919 | ||
0fe763c5 GKH |
920 | static int i2c_hid_probe(struct i2c_client *client, |
921 | const struct i2c_device_id *dev_id) | |
4a200c3b BT |
922 | { |
923 | int ret; | |
924 | struct i2c_hid *ihid; | |
925 | struct hid_device *hid; | |
926 | __u16 hidRegister; | |
927 | struct i2c_hid_platform_data *platform_data = client->dev.platform_data; | |
928 | ||
929 | dbg_hid("HID probe called for i2c 0x%02x\n", client->addr); | |
930 | ||
4a200c3b BT |
931 | if (!client->irq) { |
932 | dev_err(&client->dev, | |
933 | "HID over i2c has not been provided an Int IRQ\n"); | |
934 | return -EINVAL; | |
935 | } | |
936 | ||
937 | ihid = kzalloc(sizeof(struct i2c_hid), GFP_KERNEL); | |
938 | if (!ihid) | |
939 | return -ENOMEM; | |
940 | ||
3d7d248c BT |
941 | if (client->dev.of_node) { |
942 | ret = i2c_hid_of_probe(client, &ihid->pdata); | |
943 | if (ret) | |
944 | goto err; | |
945 | } else if (!platform_data) { | |
92241e67 MW |
946 | ret = i2c_hid_acpi_pdata(client, &ihid->pdata); |
947 | if (ret) { | |
948 | dev_err(&client->dev, | |
949 | "HID register address not provided\n"); | |
950 | goto err; | |
951 | } | |
952 | } else { | |
953 | ihid->pdata = *platform_data; | |
954 | } | |
955 | ||
4a200c3b BT |
956 | i2c_set_clientdata(client, ihid); |
957 | ||
958 | ihid->client = client; | |
959 | ||
92241e67 | 960 | hidRegister = ihid->pdata.hid_descriptor_address; |
4a200c3b BT |
961 | ihid->wHIDDescRegister = cpu_to_le16(hidRegister); |
962 | ||
963 | init_waitqueue_head(&ihid->wait); | |
964 | ||
965 | /* we need to allocate the command buffer without knowing the maximum | |
966 | * size of the reports. Let's use HID_MIN_BUFFER_SIZE, then we do the | |
967 | * real computation later. */ | |
29b45787 BT |
968 | ret = i2c_hid_alloc_buffers(ihid, HID_MIN_BUFFER_SIZE); |
969 | if (ret < 0) | |
970 | goto err; | |
4a200c3b | 971 | |
34f439e4 MW |
972 | pm_runtime_get_noresume(&client->dev); |
973 | pm_runtime_set_active(&client->dev); | |
974 | pm_runtime_enable(&client->dev); | |
975 | ||
4a200c3b BT |
976 | ret = i2c_hid_fetch_hid_descriptor(ihid); |
977 | if (ret < 0) | |
34f439e4 | 978 | goto err_pm; |
4a200c3b BT |
979 | |
980 | ret = i2c_hid_init_irq(client); | |
981 | if (ret < 0) | |
34f439e4 | 982 | goto err_pm; |
4a200c3b BT |
983 | |
984 | hid = hid_allocate_device(); | |
985 | if (IS_ERR(hid)) { | |
986 | ret = PTR_ERR(hid); | |
8a1bbb53 | 987 | goto err_irq; |
4a200c3b BT |
988 | } |
989 | ||
990 | ihid->hid = hid; | |
991 | ||
992 | hid->driver_data = client; | |
993 | hid->ll_driver = &i2c_hid_ll_driver; | |
4a200c3b | 994 | hid->dev.parent = &client->dev; |
7b199811 | 995 | ACPI_COMPANION_SET(&hid->dev, ACPI_COMPANION(&client->dev)); |
4a200c3b BT |
996 | hid->bus = BUS_I2C; |
997 | hid->version = le16_to_cpu(ihid->hdesc.bcdVersion); | |
998 | hid->vendor = le16_to_cpu(ihid->hdesc.wVendorID); | |
999 | hid->product = le16_to_cpu(ihid->hdesc.wProductID); | |
1000 | ||
9972dcc2 | 1001 | snprintf(hid->name, sizeof(hid->name), "%s %04hX:%04hX", |
4a200c3b BT |
1002 | client->name, hid->vendor, hid->product); |
1003 | ||
1004 | ret = hid_add_device(hid); | |
1005 | if (ret) { | |
1006 | if (ret != -ENODEV) | |
1007 | hid_err(client, "can't add hid device: %d\n", ret); | |
1008 | goto err_mem_free; | |
1009 | } | |
1010 | ||
34f439e4 | 1011 | pm_runtime_put(&client->dev); |
4a200c3b BT |
1012 | return 0; |
1013 | ||
1014 | err_mem_free: | |
1015 | hid_destroy_device(hid); | |
1016 | ||
8a1bbb53 BT |
1017 | err_irq: |
1018 | free_irq(client->irq, ihid); | |
4a200c3b | 1019 | |
34f439e4 MW |
1020 | err_pm: |
1021 | pm_runtime_put_noidle(&client->dev); | |
1022 | pm_runtime_disable(&client->dev); | |
1023 | ||
8a1bbb53 | 1024 | err: |
3c626024 | 1025 | i2c_hid_free_buffers(ihid); |
4a200c3b BT |
1026 | kfree(ihid); |
1027 | return ret; | |
1028 | } | |
1029 | ||
0fe763c5 | 1030 | static int i2c_hid_remove(struct i2c_client *client) |
4a200c3b BT |
1031 | { |
1032 | struct i2c_hid *ihid = i2c_get_clientdata(client); | |
1033 | struct hid_device *hid; | |
1034 | ||
34f439e4 MW |
1035 | pm_runtime_get_sync(&client->dev); |
1036 | pm_runtime_disable(&client->dev); | |
1037 | pm_runtime_set_suspended(&client->dev); | |
1038 | pm_runtime_put_noidle(&client->dev); | |
1039 | ||
4a200c3b BT |
1040 | hid = ihid->hid; |
1041 | hid_destroy_device(hid); | |
1042 | ||
1043 | free_irq(client->irq, ihid); | |
1044 | ||
134ebfd8 BT |
1045 | if (ihid->bufsize) |
1046 | i2c_hid_free_buffers(ihid); | |
1047 | ||
4a200c3b BT |
1048 | kfree(ihid); |
1049 | ||
1050 | return 0; | |
1051 | } | |
1052 | ||
1053 | #ifdef CONFIG_PM_SLEEP | |
1054 | static int i2c_hid_suspend(struct device *dev) | |
1055 | { | |
1056 | struct i2c_client *client = to_i2c_client(dev); | |
109571cf AD |
1057 | struct i2c_hid *ihid = i2c_get_clientdata(client); |
1058 | struct hid_device *hid = ihid->hid; | |
1059 | int ret = 0; | |
4a200c3b | 1060 | |
94037efe | 1061 | disable_irq(client->irq); |
4a200c3b | 1062 | if (device_may_wakeup(&client->dev)) |
8a1bbb53 | 1063 | enable_irq_wake(client->irq); |
4a200c3b | 1064 | |
109571cf AD |
1065 | if (hid->driver && hid->driver->suspend) |
1066 | ret = hid->driver->suspend(hid, PMSG_SUSPEND); | |
1067 | ||
4a200c3b BT |
1068 | /* Save some power */ |
1069 | i2c_hid_set_power(client, I2C_HID_PWR_SLEEP); | |
1070 | ||
109571cf | 1071 | return ret; |
4a200c3b BT |
1072 | } |
1073 | ||
1074 | static int i2c_hid_resume(struct device *dev) | |
1075 | { | |
1076 | int ret; | |
1077 | struct i2c_client *client = to_i2c_client(dev); | |
109571cf AD |
1078 | struct i2c_hid *ihid = i2c_get_clientdata(client); |
1079 | struct hid_device *hid = ihid->hid; | |
4a200c3b | 1080 | |
94037efe | 1081 | enable_irq(client->irq); |
4a200c3b BT |
1082 | ret = i2c_hid_hwreset(client); |
1083 | if (ret) | |
1084 | return ret; | |
1085 | ||
1086 | if (device_may_wakeup(&client->dev)) | |
1087 | disable_irq_wake(client->irq); | |
1088 | ||
109571cf AD |
1089 | if (hid->driver && hid->driver->reset_resume) { |
1090 | ret = hid->driver->reset_resume(hid); | |
1091 | return ret; | |
1092 | } | |
1093 | ||
4a200c3b BT |
1094 | return 0; |
1095 | } | |
1096 | #endif | |
1097 | ||
34f439e4 MW |
1098 | #ifdef CONFIG_PM_RUNTIME |
1099 | static int i2c_hid_runtime_suspend(struct device *dev) | |
1100 | { | |
1101 | struct i2c_client *client = to_i2c_client(dev); | |
1102 | ||
1103 | i2c_hid_set_power(client, I2C_HID_PWR_SLEEP); | |
1104 | disable_irq(client->irq); | |
1105 | return 0; | |
1106 | } | |
1107 | ||
1108 | static int i2c_hid_runtime_resume(struct device *dev) | |
1109 | { | |
1110 | struct i2c_client *client = to_i2c_client(dev); | |
1111 | ||
1112 | enable_irq(client->irq); | |
1113 | i2c_hid_set_power(client, I2C_HID_PWR_ON); | |
1114 | return 0; | |
1115 | } | |
1116 | #endif | |
1117 | ||
1118 | static const struct dev_pm_ops i2c_hid_pm = { | |
1119 | SET_SYSTEM_SLEEP_PM_OPS(i2c_hid_suspend, i2c_hid_resume) | |
1120 | SET_RUNTIME_PM_OPS(i2c_hid_runtime_suspend, i2c_hid_runtime_resume, | |
1121 | NULL) | |
1122 | }; | |
4a200c3b BT |
1123 | |
1124 | static const struct i2c_device_id i2c_hid_id_table[] = { | |
24ebb37e | 1125 | { "hid", 0 }, |
4a200c3b BT |
1126 | { }, |
1127 | }; | |
1128 | MODULE_DEVICE_TABLE(i2c, i2c_hid_id_table); | |
1129 | ||
1130 | ||
1131 | static struct i2c_driver i2c_hid_driver = { | |
1132 | .driver = { | |
1133 | .name = "i2c_hid", | |
1134 | .owner = THIS_MODULE, | |
1135 | .pm = &i2c_hid_pm, | |
92241e67 | 1136 | .acpi_match_table = ACPI_PTR(i2c_hid_acpi_match), |
3d7d248c | 1137 | .of_match_table = of_match_ptr(i2c_hid_of_match), |
4a200c3b BT |
1138 | }, |
1139 | ||
1140 | .probe = i2c_hid_probe, | |
0fe763c5 | 1141 | .remove = i2c_hid_remove, |
4a200c3b BT |
1142 | |
1143 | .id_table = i2c_hid_id_table, | |
1144 | }; | |
1145 | ||
1146 | module_i2c_driver(i2c_hid_driver); | |
1147 | ||
1148 | MODULE_DESCRIPTION("HID over I2C core driver"); | |
1149 | MODULE_AUTHOR("Benjamin Tissoires <benjamin.tissoires@gmail.com>"); | |
1150 | MODULE_LICENSE("GPL"); |