1 /*
2 * Synaptics touchpad with I2C interface
3 *
4 * Copyright (C) 2009 Compulab, Ltd.
5 * Mike Rapoport <mike@compulab.co.il>
6 * Igor Grinberg <grinberg@compulab.co.il>
7 *
8 * This file is subject to the terms and conditions of the GNU General Public
9 * License. See the file COPYING in the main directory of this archive for
10 * more details.
11 */
12
13 #include <linux/module.h>
14 #include <linux/i2c.h>
15 #include <linux/irq.h>
16 #include <linux/interrupt.h>
17 #include <linux/input.h>
18 #include <linux/delay.h>
19 #include <linux/workqueue.h>
20 #include <linux/slab.h>
21 #include <linux/pm.h>
22
23 #define DRIVER_NAME "synaptics_i2c"
24 /* maximum product id is 15 characters */
25 #define PRODUCT_ID_LENGTH 15
26 #define REGISTER_LENGTH 8
27
28 /*
29 * after soft reset, we should wait for 1 ms
30 * before the device becomes operational
31 */
32 #define SOFT_RESET_DELAY_US 3000
33 /* and after hard reset, we should wait for max 500ms */
34 #define HARD_RESET_DELAY_MS 500
35
36 /* Registers by SMBus address */
37 #define PAGE_SEL_REG 0xff
38 #define DEVICE_STATUS_REG 0x09
39
40 /* Registers by RMI address */
41 #define DEV_CONTROL_REG 0x0000
42 #define INTERRUPT_EN_REG 0x0001
43 #define ERR_STAT_REG 0x0002
44 #define INT_REQ_STAT_REG 0x0003
45 #define DEV_COMMAND_REG 0x0004
46
47 #define RMI_PROT_VER_REG 0x0200
48 #define MANUFACT_ID_REG 0x0201
49 #define PHYS_INT_VER_REG 0x0202
50 #define PROD_PROPERTY_REG 0x0203
51 #define INFO_QUERY_REG0 0x0204
52 #define INFO_QUERY_REG1 (INFO_QUERY_REG0 + 1)
53 #define INFO_QUERY_REG2 (INFO_QUERY_REG0 + 2)
54 #define INFO_QUERY_REG3 (INFO_QUERY_REG0 + 3)
55
56 #define PRODUCT_ID_REG0 0x0210
57 #define PRODUCT_ID_REG1 (PRODUCT_ID_REG0 + 1)
58 #define PRODUCT_ID_REG2 (PRODUCT_ID_REG0 + 2)
59 #define PRODUCT_ID_REG3 (PRODUCT_ID_REG0 + 3)
60 #define PRODUCT_ID_REG4 (PRODUCT_ID_REG0 + 4)
61 #define PRODUCT_ID_REG5 (PRODUCT_ID_REG0 + 5)
62 #define PRODUCT_ID_REG6 (PRODUCT_ID_REG0 + 6)
63 #define PRODUCT_ID_REG7 (PRODUCT_ID_REG0 + 7)
64 #define PRODUCT_ID_REG8 (PRODUCT_ID_REG0 + 8)
65 #define PRODUCT_ID_REG9 (PRODUCT_ID_REG0 + 9)
66 #define PRODUCT_ID_REG10 (PRODUCT_ID_REG0 + 10)
67 #define PRODUCT_ID_REG11 (PRODUCT_ID_REG0 + 11)
68 #define PRODUCT_ID_REG12 (PRODUCT_ID_REG0 + 12)
69 #define PRODUCT_ID_REG13 (PRODUCT_ID_REG0 + 13)
70 #define PRODUCT_ID_REG14 (PRODUCT_ID_REG0 + 14)
71 #define PRODUCT_ID_REG15 (PRODUCT_ID_REG0 + 15)
72
73 #define DATA_REG0 0x0400
74 #define ABS_PRESSURE_REG 0x0401
75 #define ABS_MSB_X_REG 0x0402
76 #define ABS_LSB_X_REG (ABS_MSB_X_REG + 1)
77 #define ABS_MSB_Y_REG 0x0404
78 #define ABS_LSB_Y_REG (ABS_MSB_Y_REG + 1)
79 #define REL_X_REG 0x0406
80 #define REL_Y_REG 0x0407
81
82 #define DEV_QUERY_REG0 0x1000
83 #define DEV_QUERY_REG1 (DEV_QUERY_REG0 + 1)
84 #define DEV_QUERY_REG2 (DEV_QUERY_REG0 + 2)
85 #define DEV_QUERY_REG3 (DEV_QUERY_REG0 + 3)
86 #define DEV_QUERY_REG4 (DEV_QUERY_REG0 + 4)
87 #define DEV_QUERY_REG5 (DEV_QUERY_REG0 + 5)
88 #define DEV_QUERY_REG6 (DEV_QUERY_REG0 + 6)
89 #define DEV_QUERY_REG7 (DEV_QUERY_REG0 + 7)
90 #define DEV_QUERY_REG8 (DEV_QUERY_REG0 + 8)
91
92 #define GENERAL_2D_CONTROL_REG 0x1041
93 #define SENSOR_SENSITIVITY_REG 0x1044
94 #define SENS_MAX_POS_MSB_REG 0x1046
95 #define SENS_MAX_POS_LSB_REG (SENS_MAX_POS_UPPER_REG + 1)
96
97 /* Register bits */
98 /* Device Control Register Bits */
99 #define REPORT_RATE_1ST_BIT 6
100
101 /* Interrupt Enable Register Bits (INTERRUPT_EN_REG) */
102 #define F10_ABS_INT_ENA 0
103 #define F10_REL_INT_ENA 1
104 #define F20_INT_ENA 2
105
106 /* Interrupt Request Register Bits (INT_REQ_STAT_REG | DEVICE_STATUS_REG) */
107 #define F10_ABS_INT_REQ 0
108 #define F10_REL_INT_REQ 1
109 #define F20_INT_REQ 2
110 /* Device Status Register Bits (DEVICE_STATUS_REG) */
111 #define STAT_CONFIGURED 6
112 #define STAT_ERROR 7
113
114 /* Device Command Register Bits (DEV_COMMAND_REG) */
115 #define RESET_COMMAND 0x01
116 #define REZERO_COMMAND 0x02
117
118 /* Data Register 0 Bits (DATA_REG0) */
119 #define GESTURE 3
120
121 /* Device Query Registers Bits */
122 /* DEV_QUERY_REG3 */
123 #define HAS_PALM_DETECT 1
124 #define HAS_MULTI_FING 2
125 #define HAS_SCROLLER 4
126 #define HAS_2D_SCROLL 5
127
128 /* General 2D Control Register Bits (GENERAL_2D_CONTROL_REG) */
129 #define NO_DECELERATION 1
130 #define REDUCE_REPORTING 3
131 #define NO_FILTER 5
132
133 /* Function Masks */
134 /* Device Control Register Masks (DEV_CONTROL_REG) */
135 #define REPORT_RATE_MSK 0xc0
136 #define SLEEP_MODE_MSK 0x07
137
138 /* Device Sleep Modes */
139 #define FULL_AWAKE 0x0
140 #define NORMAL_OP 0x1
141 #define LOW_PWR_OP 0x2
142 #define VERY_LOW_PWR_OP 0x3
143 #define SENS_SLEEP 0x4
144 #define SLEEP_MOD 0x5
145 #define DEEP_SLEEP 0x6
146 #define HIBERNATE 0x7
147
148 /* Interrupt Register Mask */
149 /* (INT_REQ_STAT_REG | DEVICE_STATUS_REG | INTERRUPT_EN_REG) */
150 #define INT_ENA_REQ_MSK 0x07
151 #define INT_ENA_ABS_MSK 0x01
152 #define INT_ENA_REL_MSK 0x02
153 #define INT_ENA_F20_MSK 0x04
154
155 /* Device Status Register Masks (DEVICE_STATUS_REG) */
156 #define CONFIGURED_MSK 0x40
157 #define ERROR_MSK 0x80
158
159 /* Data Register 0 Masks */
160 #define FINGER_WIDTH_MSK 0xf0
161 #define GESTURE_MSK 0x08
162 #define SENSOR_STATUS_MSK 0x07
163
164 /*
165 * MSB Position Register Masks
166 * ABS_MSB_X_REG | ABS_MSB_Y_REG | SENS_MAX_POS_MSB_REG |
167 * DEV_QUERY_REG3 | DEV_QUERY_REG5
168 */
169 #define MSB_POSITION_MSK 0x1f
170
171 /* Device Query Registers Masks */
172
173 /* DEV_QUERY_REG2 */
174 #define NUM_EXTRA_POS_MSK 0x07
175
176 /* When in IRQ mode read the device every THREAD_IRQ_SLEEP_SECS */
177 #define THREAD_IRQ_SLEEP_SECS 2
178 #define THREAD_IRQ_SLEEP_MSECS (THREAD_IRQ_SLEEP_SECS * MSEC_PER_SEC)
179
180 /*
181 * When in Polling mode and no data received for NO_DATA_THRES msecs
182 * reduce the polling rate to NO_DATA_SLEEP_MSECS
183 */
184 #define NO_DATA_THRES (MSEC_PER_SEC)
185 #define NO_DATA_SLEEP_MSECS (MSEC_PER_SEC / 4)
186
187 /* Control touchpad's No Deceleration option */
188 static bool no_decel = true;
189 module_param(no_decel, bool, 0644);
190 MODULE_PARM_DESC(no_decel, "No Deceleration. Default = 1 (on)");
191
192 /* Control touchpad's Reduced Reporting option */
193 static bool reduce_report;
194 module_param(reduce_report, bool, 0644);
195 MODULE_PARM_DESC(reduce_report, "Reduced Reporting. Default = 0 (off)");
196
197 /* Control touchpad's No Filter option */
198 static bool no_filter;
199 module_param(no_filter, bool, 0644);
200 MODULE_PARM_DESC(no_filter, "No Filter. Default = 0 (off)");
201
202 /*
203 * touchpad Attention line is Active Low and Open Drain,
204 * therefore should be connected to pulled up line
205 * and the irq configuration should be set to Falling Edge Trigger
206 */
207 /* Control IRQ / Polling option */
208 static bool polling_req;
209 module_param(polling_req, bool, 0444);
210 MODULE_PARM_DESC(polling_req, "Request Polling. Default = 0 (use irq)");
211
212 /* Control Polling Rate */
213 static int scan_rate = 80;
214 module_param(scan_rate, int, 0644);
215 MODULE_PARM_DESC(scan_rate, "Polling rate in times/sec. Default = 80");
216
217 /* The main device structure */
218 struct synaptics_i2c {
219 struct i2c_client *client;
220 struct input_dev *input;
221 struct delayed_work dwork;
222 int no_data_count;
223 int no_decel_param;
224 int reduce_report_param;
225 int no_filter_param;
226 int scan_rate_param;
227 int scan_ms;
228 };
229
set_scan_rate(struct synaptics_i2c * touch,int scan_rate)230 static inline void set_scan_rate(struct synaptics_i2c *touch, int scan_rate)
231 {
232 touch->scan_ms = MSEC_PER_SEC / scan_rate;
233 touch->scan_rate_param = scan_rate;
234 }
235
236 /*
237 * Driver's initial design makes no race condition possible on i2c bus,
238 * so there is no need in any locking.
239 * Keep it in mind, while playing with the code.
240 */
synaptics_i2c_reg_get(struct i2c_client * client,u16 reg)241 static s32 synaptics_i2c_reg_get(struct i2c_client *client, u16 reg)
242 {
243 int ret;
244
245 ret = i2c_smbus_write_byte_data(client, PAGE_SEL_REG, reg >> 8);
246 if (ret == 0)
247 ret = i2c_smbus_read_byte_data(client, reg & 0xff);
248
249 return ret;
250 }
251
synaptics_i2c_reg_set(struct i2c_client * client,u16 reg,u8 val)252 static s32 synaptics_i2c_reg_set(struct i2c_client *client, u16 reg, u8 val)
253 {
254 int ret;
255
256 ret = i2c_smbus_write_byte_data(client, PAGE_SEL_REG, reg >> 8);
257 if (ret == 0)
258 ret = i2c_smbus_write_byte_data(client, reg & 0xff, val);
259
260 return ret;
261 }
262
synaptics_i2c_word_get(struct i2c_client * client,u16 reg)263 static s32 synaptics_i2c_word_get(struct i2c_client *client, u16 reg)
264 {
265 int ret;
266
267 ret = i2c_smbus_write_byte_data(client, PAGE_SEL_REG, reg >> 8);
268 if (ret == 0)
269 ret = i2c_smbus_read_word_data(client, reg & 0xff);
270
271 return ret;
272 }
273
synaptics_i2c_config(struct i2c_client * client)274 static int synaptics_i2c_config(struct i2c_client *client)
275 {
276 int ret, control;
277 u8 int_en;
278
279 /* set Report Rate to Device Highest (>=80) and Sleep to normal */
280 ret = synaptics_i2c_reg_set(client, DEV_CONTROL_REG, 0xc1);
281 if (ret)
282 return ret;
283
284 /* set Interrupt Disable to Func20 / Enable to Func10) */
285 int_en = (polling_req) ? 0 : INT_ENA_ABS_MSK | INT_ENA_REL_MSK;
286 ret = synaptics_i2c_reg_set(client, INTERRUPT_EN_REG, int_en);
287 if (ret)
288 return ret;
289
290 control = synaptics_i2c_reg_get(client, GENERAL_2D_CONTROL_REG);
291 /* No Deceleration */
292 control |= no_decel ? 1 << NO_DECELERATION : 0;
293 /* Reduced Reporting */
294 control |= reduce_report ? 1 << REDUCE_REPORTING : 0;
295 /* No Filter */
296 control |= no_filter ? 1 << NO_FILTER : 0;
297 ret = synaptics_i2c_reg_set(client, GENERAL_2D_CONTROL_REG, control);
298 if (ret)
299 return ret;
300
301 return 0;
302 }
303
synaptics_i2c_reset_config(struct i2c_client * client)304 static int synaptics_i2c_reset_config(struct i2c_client *client)
305 {
306 int ret;
307
308 /* Reset the Touchpad */
309 ret = synaptics_i2c_reg_set(client, DEV_COMMAND_REG, RESET_COMMAND);
310 if (ret) {
311 dev_err(&client->dev, "Unable to reset device\n");
312 } else {
313 usleep_range(SOFT_RESET_DELAY_US, SOFT_RESET_DELAY_US + 100);
314 ret = synaptics_i2c_config(client);
315 if (ret)
316 dev_err(&client->dev, "Unable to config device\n");
317 }
318
319 return ret;
320 }
321
synaptics_i2c_check_error(struct i2c_client * client)322 static int synaptics_i2c_check_error(struct i2c_client *client)
323 {
324 int status, ret = 0;
325
326 status = i2c_smbus_read_byte_data(client, DEVICE_STATUS_REG) &
327 (CONFIGURED_MSK | ERROR_MSK);
328
329 if (status != CONFIGURED_MSK)
330 ret = synaptics_i2c_reset_config(client);
331
332 return ret;
333 }
334
synaptics_i2c_get_input(struct synaptics_i2c * touch)335 static bool synaptics_i2c_get_input(struct synaptics_i2c *touch)
336 {
337 struct input_dev *input = touch->input;
338 int xy_delta, gesture;
339 s32 data;
340 s8 x_delta, y_delta;
341
342 /* Deal with spontaneous resets and errors */
343 if (synaptics_i2c_check_error(touch->client))
344 return false;
345
346 /* Get Gesture Bit */
347 data = synaptics_i2c_reg_get(touch->client, DATA_REG0);
348 gesture = (data >> GESTURE) & 0x1;
349
350 /*
351 * Get Relative axes. we have to get them in one shot,
352 * so we get 2 bytes starting from REL_X_REG.
353 */
354 xy_delta = synaptics_i2c_word_get(touch->client, REL_X_REG) & 0xffff;
355
356 /* Separate X from Y */
357 x_delta = xy_delta & 0xff;
358 y_delta = (xy_delta >> REGISTER_LENGTH) & 0xff;
359
360 /* Report the button event */
361 input_report_key(input, BTN_LEFT, gesture);
362
363 /* Report the deltas */
364 input_report_rel(input, REL_X, x_delta);
365 input_report_rel(input, REL_Y, -y_delta);
366 input_sync(input);
367
368 return xy_delta || gesture;
369 }
370
synaptics_i2c_irq(int irq,void * dev_id)371 static irqreturn_t synaptics_i2c_irq(int irq, void *dev_id)
372 {
373 struct synaptics_i2c *touch = dev_id;
374
375 mod_delayed_work(system_wq, &touch->dwork, 0);
376
377 return IRQ_HANDLED;
378 }
379
synaptics_i2c_check_params(struct synaptics_i2c * touch)380 static void synaptics_i2c_check_params(struct synaptics_i2c *touch)
381 {
382 bool reset = false;
383
384 if (scan_rate != touch->scan_rate_param)
385 set_scan_rate(touch, scan_rate);
386
387 if (no_decel != touch->no_decel_param) {
388 touch->no_decel_param = no_decel;
389 reset = true;
390 }
391
392 if (no_filter != touch->no_filter_param) {
393 touch->no_filter_param = no_filter;
394 reset = true;
395 }
396
397 if (reduce_report != touch->reduce_report_param) {
398 touch->reduce_report_param = reduce_report;
399 reset = true;
400 }
401
402 if (reset)
403 synaptics_i2c_reset_config(touch->client);
404 }
405
406 /* Control the Device polling rate / Work Handler sleep time */
synaptics_i2c_adjust_delay(struct synaptics_i2c * touch,bool have_data)407 static unsigned long synaptics_i2c_adjust_delay(struct synaptics_i2c *touch,
408 bool have_data)
409 {
410 unsigned long delay, nodata_count_thres;
411
412 if (polling_req) {
413 delay = touch->scan_ms;
414 if (have_data) {
415 touch->no_data_count = 0;
416 } else {
417 nodata_count_thres = NO_DATA_THRES / touch->scan_ms;
418 if (touch->no_data_count < nodata_count_thres)
419 touch->no_data_count++;
420 else
421 delay = NO_DATA_SLEEP_MSECS;
422 }
423 return msecs_to_jiffies(delay);
424 } else {
425 delay = msecs_to_jiffies(THREAD_IRQ_SLEEP_MSECS);
426 return round_jiffies_relative(delay);
427 }
428 }
429
430 /* Work Handler */
synaptics_i2c_work_handler(struct work_struct * work)431 static void synaptics_i2c_work_handler(struct work_struct *work)
432 {
433 bool have_data;
434 struct synaptics_i2c *touch =
435 container_of(work, struct synaptics_i2c, dwork.work);
436 unsigned long delay;
437
438 synaptics_i2c_check_params(touch);
439
440 have_data = synaptics_i2c_get_input(touch);
441 delay = synaptics_i2c_adjust_delay(touch, have_data);
442
443 /*
444 * While interrupt driven, there is no real need to poll the device.
445 * But touchpads are very sensitive, so there could be errors
446 * related to physical environment and the attention line isn't
447 * necessarily asserted. In such case we can lose the touchpad.
448 * We poll the device once in THREAD_IRQ_SLEEP_SECS and
449 * if error is detected, we try to reset and reconfigure the touchpad.
450 */
451 mod_delayed_work(system_wq, &touch->dwork, delay);
452 }
453
synaptics_i2c_open(struct input_dev * input)454 static int synaptics_i2c_open(struct input_dev *input)
455 {
456 struct synaptics_i2c *touch = input_get_drvdata(input);
457 int ret;
458
459 ret = synaptics_i2c_reset_config(touch->client);
460 if (ret)
461 return ret;
462
463 if (polling_req)
464 mod_delayed_work(system_wq, &touch->dwork,
465 msecs_to_jiffies(NO_DATA_SLEEP_MSECS));
466
467 return 0;
468 }
469
synaptics_i2c_close(struct input_dev * input)470 static void synaptics_i2c_close(struct input_dev *input)
471 {
472 struct synaptics_i2c *touch = input_get_drvdata(input);
473
474 if (!polling_req)
475 synaptics_i2c_reg_set(touch->client, INTERRUPT_EN_REG, 0);
476
477 cancel_delayed_work_sync(&touch->dwork);
478
479 /* Save some power */
480 synaptics_i2c_reg_set(touch->client, DEV_CONTROL_REG, DEEP_SLEEP);
481 }
482
synaptics_i2c_set_input_params(struct synaptics_i2c * touch)483 static void synaptics_i2c_set_input_params(struct synaptics_i2c *touch)
484 {
485 struct input_dev *input = touch->input;
486
487 input->name = touch->client->name;
488 input->phys = touch->client->adapter->name;
489 input->id.bustype = BUS_I2C;
490 input->id.version = synaptics_i2c_word_get(touch->client,
491 INFO_QUERY_REG0);
492 input->dev.parent = &touch->client->dev;
493 input->open = synaptics_i2c_open;
494 input->close = synaptics_i2c_close;
495 input_set_drvdata(input, touch);
496
497 /* Register the device as mouse */
498 __set_bit(EV_REL, input->evbit);
499 __set_bit(REL_X, input->relbit);
500 __set_bit(REL_Y, input->relbit);
501
502 /* Register device's buttons and keys */
503 __set_bit(EV_KEY, input->evbit);
504 __set_bit(BTN_LEFT, input->keybit);
505 }
506
synaptics_i2c_touch_create(struct i2c_client * client)507 static struct synaptics_i2c *synaptics_i2c_touch_create(struct i2c_client *client)
508 {
509 struct synaptics_i2c *touch;
510
511 touch = kzalloc(sizeof(struct synaptics_i2c), GFP_KERNEL);
512 if (!touch)
513 return NULL;
514
515 touch->client = client;
516 touch->no_decel_param = no_decel;
517 touch->scan_rate_param = scan_rate;
518 set_scan_rate(touch, scan_rate);
519 INIT_DELAYED_WORK(&touch->dwork, synaptics_i2c_work_handler);
520
521 return touch;
522 }
523
synaptics_i2c_probe(struct i2c_client * client)524 static int synaptics_i2c_probe(struct i2c_client *client)
525 {
526 int ret;
527 struct synaptics_i2c *touch;
528
529 touch = synaptics_i2c_touch_create(client);
530 if (!touch)
531 return -ENOMEM;
532
533 ret = synaptics_i2c_reset_config(client);
534 if (ret)
535 goto err_mem_free;
536
537 if (client->irq < 1)
538 polling_req = true;
539
540 touch->input = input_allocate_device();
541 if (!touch->input) {
542 ret = -ENOMEM;
543 goto err_mem_free;
544 }
545
546 synaptics_i2c_set_input_params(touch);
547
548 if (!polling_req) {
549 dev_dbg(&touch->client->dev,
550 "Requesting IRQ: %d\n", touch->client->irq);
551
552 ret = request_irq(touch->client->irq, synaptics_i2c_irq,
553 IRQ_TYPE_EDGE_FALLING,
554 DRIVER_NAME, touch);
555 if (ret) {
556 dev_warn(&touch->client->dev,
557 "IRQ request failed: %d, "
558 "falling back to polling\n", ret);
559 polling_req = true;
560 synaptics_i2c_reg_set(touch->client,
561 INTERRUPT_EN_REG, 0);
562 }
563 }
564
565 if (polling_req)
566 dev_dbg(&touch->client->dev,
567 "Using polling at rate: %d times/sec\n", scan_rate);
568
569 /* Register the device in input subsystem */
570 ret = input_register_device(touch->input);
571 if (ret) {
572 dev_err(&client->dev,
573 "Input device register failed: %d\n", ret);
574 goto err_input_free;
575 }
576
577 i2c_set_clientdata(client, touch);
578
579 return 0;
580
581 err_input_free:
582 input_free_device(touch->input);
583 err_mem_free:
584 kfree(touch);
585
586 return ret;
587 }
588
synaptics_i2c_remove(struct i2c_client * client)589 static void synaptics_i2c_remove(struct i2c_client *client)
590 {
591 struct synaptics_i2c *touch = i2c_get_clientdata(client);
592
593 if (!polling_req)
594 free_irq(client->irq, touch);
595
596 input_unregister_device(touch->input);
597 kfree(touch);
598 }
599
synaptics_i2c_suspend(struct device * dev)600 static int synaptics_i2c_suspend(struct device *dev)
601 {
602 struct i2c_client *client = to_i2c_client(dev);
603 struct synaptics_i2c *touch = i2c_get_clientdata(client);
604
605 cancel_delayed_work_sync(&touch->dwork);
606
607 /* Save some power */
608 synaptics_i2c_reg_set(touch->client, DEV_CONTROL_REG, DEEP_SLEEP);
609
610 return 0;
611 }
612
synaptics_i2c_resume(struct device * dev)613 static int synaptics_i2c_resume(struct device *dev)
614 {
615 int ret;
616 struct i2c_client *client = to_i2c_client(dev);
617 struct synaptics_i2c *touch = i2c_get_clientdata(client);
618
619 ret = synaptics_i2c_reset_config(client);
620 if (ret)
621 return ret;
622
623 mod_delayed_work(system_wq, &touch->dwork,
624 msecs_to_jiffies(NO_DATA_SLEEP_MSECS));
625
626 return 0;
627 }
628
629 static DEFINE_SIMPLE_DEV_PM_OPS(synaptics_i2c_pm, synaptics_i2c_suspend,
630 synaptics_i2c_resume);
631
632 static const struct i2c_device_id synaptics_i2c_id_table[] = {
633 { "synaptics_i2c", 0 },
634 { },
635 };
636 MODULE_DEVICE_TABLE(i2c, synaptics_i2c_id_table);
637
638 #ifdef CONFIG_OF
639 static const struct of_device_id synaptics_i2c_of_match[] = {
640 { .compatible = "synaptics,synaptics_i2c", },
641 { },
642 };
643 MODULE_DEVICE_TABLE(of, synaptics_i2c_of_match);
644 #endif
645
646 static struct i2c_driver synaptics_i2c_driver = {
647 .driver = {
648 .name = DRIVER_NAME,
649 .of_match_table = of_match_ptr(synaptics_i2c_of_match),
650 .pm = pm_sleep_ptr(&synaptics_i2c_pm),
651 },
652
653 .probe = synaptics_i2c_probe,
654 .remove = synaptics_i2c_remove,
655
656 .id_table = synaptics_i2c_id_table,
657 };
658
659 module_i2c_driver(synaptics_i2c_driver);
660
661 MODULE_DESCRIPTION("Synaptics I2C touchpad driver");
662 MODULE_AUTHOR("Mike Rapoport, Igor Grinberg, Compulab");
663 MODULE_LICENSE("GPL");
664
665