blob: 9867dfe2a638fd8b3ec345f9868f54433df6aa9e [file] [log] [blame]
Mike Rapoporteef3e4c2009-06-11 08:08:39 -07001/*
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
21#define DRIVER_NAME "synaptics_i2c"
22/* maximum product id is 15 characters */
23#define PRODUCT_ID_LENGTH 15
24#define REGISTER_LENGTH 8
25
26/*
27 * after soft reset, we should wait for 1 ms
28 * before the device becomes operational
29 */
30#define SOFT_RESET_DELAY_MS 3
31/* and after hard reset, we should wait for max 500ms */
32#define HARD_RESET_DELAY_MS 500
33
34/* Registers by SMBus address */
35#define PAGE_SEL_REG 0xff
36#define DEVICE_STATUS_REG 0x09
37
38/* Registers by RMI address */
39#define DEV_CONTROL_REG 0x0000
40#define INTERRUPT_EN_REG 0x0001
41#define ERR_STAT_REG 0x0002
42#define INT_REQ_STAT_REG 0x0003
43#define DEV_COMMAND_REG 0x0004
44
45#define RMI_PROT_VER_REG 0x0200
46#define MANUFACT_ID_REG 0x0201
47#define PHYS_INT_VER_REG 0x0202
48#define PROD_PROPERTY_REG 0x0203
49#define INFO_QUERY_REG0 0x0204
50#define INFO_QUERY_REG1 (INFO_QUERY_REG0 + 1)
51#define INFO_QUERY_REG2 (INFO_QUERY_REG0 + 2)
52#define INFO_QUERY_REG3 (INFO_QUERY_REG0 + 3)
53
54#define PRODUCT_ID_REG0 0x0210
55#define PRODUCT_ID_REG1 (PRODUCT_ID_REG0 + 1)
56#define PRODUCT_ID_REG2 (PRODUCT_ID_REG0 + 2)
57#define PRODUCT_ID_REG3 (PRODUCT_ID_REG0 + 3)
58#define PRODUCT_ID_REG4 (PRODUCT_ID_REG0 + 4)
59#define PRODUCT_ID_REG5 (PRODUCT_ID_REG0 + 5)
60#define PRODUCT_ID_REG6 (PRODUCT_ID_REG0 + 6)
61#define PRODUCT_ID_REG7 (PRODUCT_ID_REG0 + 7)
62#define PRODUCT_ID_REG8 (PRODUCT_ID_REG0 + 8)
63#define PRODUCT_ID_REG9 (PRODUCT_ID_REG0 + 9)
64#define PRODUCT_ID_REG10 (PRODUCT_ID_REG0 + 10)
65#define PRODUCT_ID_REG11 (PRODUCT_ID_REG0 + 11)
66#define PRODUCT_ID_REG12 (PRODUCT_ID_REG0 + 12)
67#define PRODUCT_ID_REG13 (PRODUCT_ID_REG0 + 13)
68#define PRODUCT_ID_REG14 (PRODUCT_ID_REG0 + 14)
69#define PRODUCT_ID_REG15 (PRODUCT_ID_REG0 + 15)
70
71#define DATA_REG0 0x0400
72#define ABS_PRESSURE_REG 0x0401
73#define ABS_MSB_X_REG 0x0402
74#define ABS_LSB_X_REG (ABS_MSB_X_REG + 1)
75#define ABS_MSB_Y_REG 0x0404
76#define ABS_LSB_Y_REG (ABS_MSB_Y_REG + 1)
77#define REL_X_REG 0x0406
78#define REL_Y_REG 0x0407
79
80#define DEV_QUERY_REG0 0x1000
81#define DEV_QUERY_REG1 (DEV_QUERY_REG0 + 1)
82#define DEV_QUERY_REG2 (DEV_QUERY_REG0 + 2)
83#define DEV_QUERY_REG3 (DEV_QUERY_REG0 + 3)
84#define DEV_QUERY_REG4 (DEV_QUERY_REG0 + 4)
85#define DEV_QUERY_REG5 (DEV_QUERY_REG0 + 5)
86#define DEV_QUERY_REG6 (DEV_QUERY_REG0 + 6)
87#define DEV_QUERY_REG7 (DEV_QUERY_REG0 + 7)
88#define DEV_QUERY_REG8 (DEV_QUERY_REG0 + 8)
89
90#define GENERAL_2D_CONTROL_REG 0x1041
91#define SENSOR_SENSITIVITY_REG 0x1044
92#define SENS_MAX_POS_MSB_REG 0x1046
93#define SENS_MAX_POS_LSB_REG (SENS_MAX_POS_UPPER_REG + 1)
94
95/* Register bits */
96/* Device Control Register Bits */
97#define REPORT_RATE_1ST_BIT 6
98
99/* Interrupt Enable Register Bits (INTERRUPT_EN_REG) */
100#define F10_ABS_INT_ENA 0
101#define F10_REL_INT_ENA 1
102#define F20_INT_ENA 2
103
104/* Interrupt Request Register Bits (INT_REQ_STAT_REG | DEVICE_STATUS_REG) */
105#define F10_ABS_INT_REQ 0
106#define F10_REL_INT_REQ 1
107#define F20_INT_REQ 2
108/* Device Status Register Bits (DEVICE_STATUS_REG) */
109#define STAT_CONFIGURED 6
110#define STAT_ERROR 7
111
112/* Device Command Register Bits (DEV_COMMAND_REG) */
113#define RESET_COMMAND 0x01
114#define REZERO_COMMAND 0x02
115
116/* Data Register 0 Bits (DATA_REG0) */
117#define GESTURE 3
118
119/* Device Query Registers Bits */
120/* DEV_QUERY_REG3 */
121#define HAS_PALM_DETECT 1
122#define HAS_MULTI_FING 2
123#define HAS_SCROLLER 4
124#define HAS_2D_SCROLL 5
125
126/* General 2D Control Register Bits (GENERAL_2D_CONTROL_REG) */
127#define NO_DECELERATION 1
128#define REDUCE_REPORTING 3
129#define NO_FILTER 5
130
131/* Function Masks */
132/* Device Control Register Masks (DEV_CONTROL_REG) */
133#define REPORT_RATE_MSK 0xc0
134#define SLEEP_MODE_MSK 0x07
135
136/* Device Sleep Modes */
137#define FULL_AWAKE 0x0
138#define NORMAL_OP 0x1
139#define LOW_PWR_OP 0x2
140#define VERY_LOW_PWR_OP 0x3
141#define SENS_SLEEP 0x4
142#define SLEEP_MOD 0x5
143#define DEEP_SLEEP 0x6
144#define HIBERNATE 0x7
145
146/* Interrupt Register Mask */
147/* (INT_REQ_STAT_REG | DEVICE_STATUS_REG | INTERRUPT_EN_REG) */
148#define INT_ENA_REQ_MSK 0x07
149#define INT_ENA_ABS_MSK 0x01
150#define INT_ENA_REL_MSK 0x02
151#define INT_ENA_F20_MSK 0x04
152
153/* Device Status Register Masks (DEVICE_STATUS_REG) */
154#define CONFIGURED_MSK 0x40
155#define ERROR_MSK 0x80
156
157/* Data Register 0 Masks */
158#define FINGER_WIDTH_MSK 0xf0
159#define GESTURE_MSK 0x08
160#define SENSOR_STATUS_MSK 0x07
161
162/*
163 * MSB Position Register Masks
164 * ABS_MSB_X_REG | ABS_MSB_Y_REG | SENS_MAX_POS_MSB_REG |
165 * DEV_QUERY_REG3 | DEV_QUERY_REG5
166 */
167#define MSB_POSITION_MSK 0x1f
168
169/* Device Query Registers Masks */
170
171/* DEV_QUERY_REG2 */
172#define NUM_EXTRA_POS_MSK 0x07
173
174/* When in IRQ mode read the device every THREAD_IRQ_SLEEP_SECS */
175#define THREAD_IRQ_SLEEP_SECS 2
176#define THREAD_IRQ_SLEEP_MSECS (THREAD_IRQ_SLEEP_SECS * MSEC_PER_SEC)
177
178/*
179 * When in Polling mode and no data received for NO_DATA_THRES msecs
180 * reduce the polling rate to NO_DATA_SLEEP_MSECS
181 */
182#define NO_DATA_THRES (MSEC_PER_SEC)
183#define NO_DATA_SLEEP_MSECS (MSEC_PER_SEC / 4)
184
185/* Control touchpad's No Deceleration option */
186static int no_decel = 1;
187module_param(no_decel, bool, 0644);
188MODULE_PARM_DESC(no_decel, "No Deceleration. Default = 1 (on)");
189
190/* Control touchpad's Reduced Reporting option */
191static int reduce_report;
192module_param(reduce_report, bool, 0644);
193MODULE_PARM_DESC(reduce_report, "Reduced Reporting. Default = 0 (off)");
194
195/* Control touchpad's No Filter option */
196static int no_filter;
197module_param(no_filter, bool, 0644);
198MODULE_PARM_DESC(no_filter, "No Filter. Default = 0 (off)");
199
200/*
201 * touchpad Attention line is Active Low and Open Drain,
202 * therefore should be connected to pulled up line
203 * and the irq configuration should be set to Falling Edge Trigger
204 */
205/* Control IRQ / Polling option */
Dmitry Torokhov30b37132009-09-16 01:06:42 -0700206static bool polling_req;
Mike Rapoporteef3e4c2009-06-11 08:08:39 -0700207module_param(polling_req, bool, 0444);
208MODULE_PARM_DESC(polling_req, "Request Polling. Default = 0 (use irq)");
209
210/* Control Polling Rate */
211static int scan_rate = 80;
212module_param(scan_rate, int, 0644);
213MODULE_PARM_DESC(scan_rate, "Polling rate in times/sec. Default = 80");
214
215/* The main device structure */
216struct synaptics_i2c {
217 struct i2c_client *client;
218 struct input_dev *input;
219 struct delayed_work dwork;
Dmitry Torokhov30b37132009-09-16 01:06:42 -0700220 spinlock_t lock;
Mike Rapoporteef3e4c2009-06-11 08:08:39 -0700221 int no_data_count;
222 int no_decel_param;
223 int reduce_report_param;
224 int no_filter_param;
225 int scan_rate_param;
226 int scan_ms;
227};
228
229static inline void set_scan_rate(struct synaptics_i2c *touch, int scan_rate)
230{
231 touch->scan_ms = MSEC_PER_SEC / scan_rate;
232 touch->scan_rate_param = scan_rate;
233}
234
235/*
236 * Driver's initial design makes no race condition possible on i2c bus,
237 * so there is no need in any locking.
238 * Keep it in mind, while playing with the code.
239 */
240static s32 synaptics_i2c_reg_get(struct i2c_client *client, u16 reg)
241{
242 int ret;
243
244 ret = i2c_smbus_write_byte_data(client, PAGE_SEL_REG, reg >> 8);
245 if (ret == 0)
246 ret = i2c_smbus_read_byte_data(client, reg & 0xff);
247
248 return ret;
249}
250
251static s32 synaptics_i2c_reg_set(struct i2c_client *client, u16 reg, u8 val)
252{
253 int ret;
254
255 ret = i2c_smbus_write_byte_data(client, PAGE_SEL_REG, reg >> 8);
256 if (ret == 0)
257 ret = i2c_smbus_write_byte_data(client, reg & 0xff, val);
258
259 return ret;
260}
261
262static s32 synaptics_i2c_word_get(struct i2c_client *client, u16 reg)
263{
264 int ret;
265
266 ret = i2c_smbus_write_byte_data(client, PAGE_SEL_REG, reg >> 8);
267 if (ret == 0)
268 ret = i2c_smbus_read_word_data(client, reg & 0xff);
269
270 return ret;
271}
272
273static int synaptics_i2c_config(struct i2c_client *client)
274{
275 int ret, control;
276 u8 int_en;
277
278 /* set Report Rate to Device Highest (>=80) and Sleep to normal */
279 ret = synaptics_i2c_reg_set(client, DEV_CONTROL_REG, 0xc1);
280 if (ret)
281 return ret;
282
283 /* set Interrupt Disable to Func20 / Enable to Func10) */
284 int_en = (polling_req) ? 0 : INT_ENA_ABS_MSK | INT_ENA_REL_MSK;
285 ret = synaptics_i2c_reg_set(client, INTERRUPT_EN_REG, int_en);
286 if (ret)
287 return ret;
288
289 control = synaptics_i2c_reg_get(client, GENERAL_2D_CONTROL_REG);
290 /* No Deceleration */
291 control |= no_decel ? 1 << NO_DECELERATION : 0;
292 /* Reduced Reporting */
293 control |= reduce_report ? 1 << REDUCE_REPORTING : 0;
294 /* No Filter */
295 control |= no_filter ? 1 << NO_FILTER : 0;
296 ret = synaptics_i2c_reg_set(client, GENERAL_2D_CONTROL_REG, control);
297 if (ret)
298 return ret;
299
300 return 0;
301}
302
303static int synaptics_i2c_reset_config(struct i2c_client *client)
304{
305 int ret;
306
307 /* Reset the Touchpad */
308 ret = synaptics_i2c_reg_set(client, DEV_COMMAND_REG, RESET_COMMAND);
309 if (ret) {
310 dev_err(&client->dev, "Unable to reset device\n");
311 } else {
312 msleep(SOFT_RESET_DELAY_MS);
313 ret = synaptics_i2c_config(client);
314 if (ret)
315 dev_err(&client->dev, "Unable to config device\n");
316 }
317
318 return ret;
319}
320
321static int synaptics_i2c_check_error(struct i2c_client *client)
322{
323 int status, ret = 0;
324
325 status = i2c_smbus_read_byte_data(client, DEVICE_STATUS_REG) &
326 (CONFIGURED_MSK | ERROR_MSK);
327
328 if (status != CONFIGURED_MSK)
329 ret = synaptics_i2c_reset_config(client);
330
331 return ret;
332}
333
334static bool synaptics_i2c_get_input(struct synaptics_i2c *touch)
335{
336 struct input_dev *input = touch->input;
337 int xy_delta, gesture;
338 s32 data;
339 s8 x_delta, y_delta;
340
341 /* Deal with spontanious resets and errors */
342 if (synaptics_i2c_check_error(touch->client))
343 return 0;
344
345 /* Get Gesture Bit */
346 data = synaptics_i2c_reg_get(touch->client, DATA_REG0);
347 gesture = (data >> GESTURE) & 0x1;
348
349 /*
350 * Get Relative axes. we have to get them in one shot,
351 * so we get 2 bytes starting from REL_X_REG.
352 */
353 xy_delta = synaptics_i2c_word_get(touch->client, REL_X_REG) & 0xffff;
354
355 /* Separate X from Y */
356 x_delta = xy_delta & 0xff;
357 y_delta = (xy_delta >> REGISTER_LENGTH) & 0xff;
358
359 /* Report the button event */
360 input_report_key(input, BTN_LEFT, gesture);
361
362 /* Report the deltas */
363 input_report_rel(input, REL_X, x_delta);
364 input_report_rel(input, REL_Y, -y_delta);
365 input_sync(input);
366
367 return xy_delta || gesture;
368}
369
Dmitry Torokhov30b37132009-09-16 01:06:42 -0700370static void synaptics_i2c_reschedule_work(struct synaptics_i2c *touch,
371 unsigned long delay)
372{
373 unsigned long flags;
374
375 spin_lock_irqsave(&touch->lock, flags);
376
377 /*
378 * If work is already scheduled then subsequent schedules will not
379 * change the scheduled time that's why we have to cancel it first.
380 */
381 __cancel_delayed_work(&touch->dwork);
382 schedule_delayed_work(&touch->dwork, delay);
383
384 spin_unlock_irqrestore(&touch->lock, flags);
385}
386
Mike Rapoporteef3e4c2009-06-11 08:08:39 -0700387static irqreturn_t synaptics_i2c_irq(int irq, void *dev_id)
388{
389 struct synaptics_i2c *touch = dev_id;
390
Dmitry Torokhov30b37132009-09-16 01:06:42 -0700391 synaptics_i2c_reschedule_work(touch, 0);
Mike Rapoporteef3e4c2009-06-11 08:08:39 -0700392
393 return IRQ_HANDLED;
394}
395
396static void synaptics_i2c_check_params(struct synaptics_i2c *touch)
397{
398 bool reset = false;
399
400 if (scan_rate != touch->scan_rate_param)
401 set_scan_rate(touch, scan_rate);
402
403 if (no_decel != touch->no_decel_param) {
404 touch->no_decel_param = no_decel;
405 reset = true;
406 }
407
408 if (no_filter != touch->no_filter_param) {
409 touch->no_filter_param = no_filter;
410 reset = true;
411 }
412
413 if (reduce_report != touch->reduce_report_param) {
414 touch->reduce_report_param = reduce_report;
415 reset = true;
416 }
417
418 if (reset)
419 synaptics_i2c_reset_config(touch->client);
420}
421
422/* Control the Device polling rate / Work Handler sleep time */
Dmitry Torokhovf5ba3502009-11-02 21:57:40 -0800423static unsigned long synaptics_i2c_adjust_delay(struct synaptics_i2c *touch,
424 bool have_data)
Mike Rapoporteef3e4c2009-06-11 08:08:39 -0700425{
426 unsigned long delay, nodata_count_thres;
427
428 if (polling_req) {
429 delay = touch->scan_ms;
430 if (have_data) {
431 touch->no_data_count = 0;
432 } else {
433 nodata_count_thres = NO_DATA_THRES / touch->scan_ms;
434 if (touch->no_data_count < nodata_count_thres)
435 touch->no_data_count++;
436 else
437 delay = NO_DATA_SLEEP_MSECS;
438 }
439 return msecs_to_jiffies(delay);
440 } else {
441 delay = msecs_to_jiffies(THREAD_IRQ_SLEEP_MSECS);
442 return round_jiffies_relative(delay);
443 }
444}
445
446/* Work Handler */
447static void synaptics_i2c_work_handler(struct work_struct *work)
448{
449 bool have_data;
450 struct synaptics_i2c *touch =
451 container_of(work, struct synaptics_i2c, dwork.work);
452 unsigned long delay;
453
454 synaptics_i2c_check_params(touch);
455
456 have_data = synaptics_i2c_get_input(touch);
457 delay = synaptics_i2c_adjust_delay(touch, have_data);
458
459 /*
460 * While interrupt driven, there is no real need to poll the device.
461 * But touchpads are very sensitive, so there could be errors
462 * related to physical environment and the attention line isn't
463 * neccesarily asserted. In such case we can lose the touchpad.
464 * We poll the device once in THREAD_IRQ_SLEEP_SECS and
465 * if error is detected, we try to reset and reconfigure the touchpad.
466 */
Dmitry Torokhov30b37132009-09-16 01:06:42 -0700467 synaptics_i2c_reschedule_work(touch, delay);
Mike Rapoporteef3e4c2009-06-11 08:08:39 -0700468}
469
470static int synaptics_i2c_open(struct input_dev *input)
471{
472 struct synaptics_i2c *touch = input_get_drvdata(input);
473 int ret;
474
475 ret = synaptics_i2c_reset_config(touch->client);
476 if (ret)
477 return ret;
478
479 if (polling_req)
Dmitry Torokhov30b37132009-09-16 01:06:42 -0700480 synaptics_i2c_reschedule_work(touch,
481 msecs_to_jiffies(NO_DATA_SLEEP_MSECS));
Mike Rapoporteef3e4c2009-06-11 08:08:39 -0700482
483 return 0;
484}
485
486static void synaptics_i2c_close(struct input_dev *input)
487{
488 struct synaptics_i2c *touch = input_get_drvdata(input);
489
490 if (!polling_req)
491 synaptics_i2c_reg_set(touch->client, INTERRUPT_EN_REG, 0);
492
493 cancel_delayed_work_sync(&touch->dwork);
494
495 /* Save some power */
496 synaptics_i2c_reg_set(touch->client, DEV_CONTROL_REG, DEEP_SLEEP);
497}
498
499static void synaptics_i2c_set_input_params(struct synaptics_i2c *touch)
500{
501 struct input_dev *input = touch->input;
502
503 input->name = touch->client->name;
504 input->phys = touch->client->adapter->name;
505 input->id.bustype = BUS_I2C;
506 input->id.version = synaptics_i2c_word_get(touch->client,
507 INFO_QUERY_REG0);
508 input->dev.parent = &touch->client->dev;
509 input->open = synaptics_i2c_open;
510 input->close = synaptics_i2c_close;
511 input_set_drvdata(input, touch);
512
513 /* Register the device as mouse */
514 __set_bit(EV_REL, input->evbit);
515 __set_bit(REL_X, input->relbit);
516 __set_bit(REL_Y, input->relbit);
517
518 /* Register device's buttons and keys */
519 __set_bit(EV_KEY, input->evbit);
520 __set_bit(BTN_LEFT, input->keybit);
521}
522
Dmitry Torokhovf5ba3502009-11-02 21:57:40 -0800523static struct synaptics_i2c *synaptics_i2c_touch_create(struct i2c_client *client)
Mike Rapoporteef3e4c2009-06-11 08:08:39 -0700524{
525 struct synaptics_i2c *touch;
526
527 touch = kzalloc(sizeof(struct synaptics_i2c), GFP_KERNEL);
528 if (!touch)
529 return NULL;
530
531 touch->client = client;
532 touch->no_decel_param = no_decel;
533 touch->scan_rate_param = scan_rate;
534 set_scan_rate(touch, scan_rate);
535 INIT_DELAYED_WORK(&touch->dwork, synaptics_i2c_work_handler);
Dmitry Torokhov30b37132009-09-16 01:06:42 -0700536 spin_lock_init(&touch->lock);
Mike Rapoporteef3e4c2009-06-11 08:08:39 -0700537
538 return touch;
539}
540
541static int __devinit synaptics_i2c_probe(struct i2c_client *client,
542 const struct i2c_device_id *dev_id)
543{
544 int ret;
545 struct synaptics_i2c *touch;
546
547 touch = synaptics_i2c_touch_create(client);
548 if (!touch)
549 return -ENOMEM;
550
Mike Rapoporteef3e4c2009-06-11 08:08:39 -0700551 ret = synaptics_i2c_reset_config(client);
552 if (ret)
553 goto err_mem_free;
554
555 if (client->irq < 1)
Dmitry Torokhov30b37132009-09-16 01:06:42 -0700556 polling_req = true;
Mike Rapoporteef3e4c2009-06-11 08:08:39 -0700557
558 touch->input = input_allocate_device();
559 if (!touch->input) {
560 ret = -ENOMEM;
561 goto err_mem_free;
562 }
563
564 synaptics_i2c_set_input_params(touch);
565
566 if (!polling_req) {
567 dev_dbg(&touch->client->dev,
568 "Requesting IRQ: %d\n", touch->client->irq);
569
570 ret = request_irq(touch->client->irq, synaptics_i2c_irq,
571 IRQF_DISABLED|IRQ_TYPE_EDGE_FALLING,
572 DRIVER_NAME, touch);
573 if (ret) {
574 dev_warn(&touch->client->dev,
575 "IRQ request failed: %d, "
576 "falling back to polling\n", ret);
Dmitry Torokhov30b37132009-09-16 01:06:42 -0700577 polling_req = true;
Mike Rapoporteef3e4c2009-06-11 08:08:39 -0700578 synaptics_i2c_reg_set(touch->client,
579 INTERRUPT_EN_REG, 0);
580 }
581 }
582
583 if (polling_req)
584 dev_dbg(&touch->client->dev,
585 "Using polling at rate: %d times/sec\n", scan_rate);
586
587 /* Register the device in input subsystem */
588 ret = input_register_device(touch->input);
589 if (ret) {
590 dev_err(&client->dev,
591 "Input device register failed: %d\n", ret);
592 goto err_input_free;
593 }
Dmitry Torokhov30b37132009-09-16 01:06:42 -0700594
595 i2c_set_clientdata(client, touch);
596
Mike Rapoporteef3e4c2009-06-11 08:08:39 -0700597 return 0;
598
599err_input_free:
600 input_free_device(touch->input);
601err_mem_free:
Mike Rapoporteef3e4c2009-06-11 08:08:39 -0700602 kfree(touch);
603
604 return ret;
605}
606
607static int __devexit synaptics_i2c_remove(struct i2c_client *client)
608{
609 struct synaptics_i2c *touch = i2c_get_clientdata(client);
610
611 if (!polling_req)
Dmitry Torokhov30b37132009-09-16 01:06:42 -0700612 free_irq(client->irq, touch);
Mike Rapoporteef3e4c2009-06-11 08:08:39 -0700613
614 input_unregister_device(touch->input);
615 i2c_set_clientdata(client, NULL);
616 kfree(touch);
617
618 return 0;
619}
620
621#ifdef CONFIG_PM
622static int synaptics_i2c_suspend(struct i2c_client *client, pm_message_t mesg)
623{
624 struct synaptics_i2c *touch = i2c_get_clientdata(client);
625
626 cancel_delayed_work_sync(&touch->dwork);
627
628 /* Save some power */
629 synaptics_i2c_reg_set(touch->client, DEV_CONTROL_REG, DEEP_SLEEP);
630
631 return 0;
632}
633
634static int synaptics_i2c_resume(struct i2c_client *client)
635{
636 int ret;
637 struct synaptics_i2c *touch = i2c_get_clientdata(client);
638
639 ret = synaptics_i2c_reset_config(client);
640 if (ret)
641 return ret;
642
Dmitry Torokhov30b37132009-09-16 01:06:42 -0700643 synaptics_i2c_reschedule_work(touch,
644 msecs_to_jiffies(NO_DATA_SLEEP_MSECS));
Mike Rapoporteef3e4c2009-06-11 08:08:39 -0700645
646 return 0;
647}
648#else
649#define synaptics_i2c_suspend NULL
650#define synaptics_i2c_resume NULL
651#endif
652
653static const struct i2c_device_id synaptics_i2c_id_table[] = {
654 { "synaptics_i2c", 0 },
655 { },
656};
657MODULE_DEVICE_TABLE(i2c, synaptics_i2c_id_table);
658
659static struct i2c_driver synaptics_i2c_driver = {
660 .driver = {
661 .name = DRIVER_NAME,
662 .owner = THIS_MODULE,
663 },
664
665 .probe = synaptics_i2c_probe,
666 .remove = __devexit_p(synaptics_i2c_remove),
667
668 .suspend = synaptics_i2c_suspend,
669 .resume = synaptics_i2c_resume,
670 .id_table = synaptics_i2c_id_table,
671};
672
673static int __init synaptics_i2c_init(void)
674{
675 return i2c_add_driver(&synaptics_i2c_driver);
676}
677
678static void __exit synaptics_i2c_exit(void)
679{
680 i2c_del_driver(&synaptics_i2c_driver);
681}
682
683module_init(synaptics_i2c_init);
684module_exit(synaptics_i2c_exit);
685
686MODULE_DESCRIPTION("Synaptics I2C touchpad driver");
687MODULE_AUTHOR("Mike Rapoport, Igor Grinberg, Compulab");
688MODULE_LICENSE("GPL");
689