blob: ad822608f6ee92f5ffb3b98ac08425d2cd3d845d [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>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090020#include <linux/slab.h>
Mark Brown87b2c7d2011-02-11 08:53:33 -080021#include <linux/pm.h>
Mike Rapoporteef3e4c2009-06-11 08:08:39 -070022
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_MS 3
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 */
Rusty Russell90ab5ee2012-01-13 09:32:20 +1030188static bool no_decel = 1;
Mike Rapoporteef3e4c2009-06-11 08:08:39 -0700189module_param(no_decel, bool, 0644);
190MODULE_PARM_DESC(no_decel, "No Deceleration. Default = 1 (on)");
191
192/* Control touchpad's Reduced Reporting option */
Rusty Russell90ab5ee2012-01-13 09:32:20 +1030193static bool reduce_report;
Mike Rapoporteef3e4c2009-06-11 08:08:39 -0700194module_param(reduce_report, bool, 0644);
195MODULE_PARM_DESC(reduce_report, "Reduced Reporting. Default = 0 (off)");
196
197/* Control touchpad's No Filter option */
Rusty Russell90ab5ee2012-01-13 09:32:20 +1030198static bool no_filter;
Mike Rapoporteef3e4c2009-06-11 08:08:39 -0700199module_param(no_filter, bool, 0644);
200MODULE_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 */
Dmitry Torokhov30b37132009-09-16 01:06:42 -0700208static bool polling_req;
Mike Rapoporteef3e4c2009-06-11 08:08:39 -0700209module_param(polling_req, bool, 0444);
210MODULE_PARM_DESC(polling_req, "Request Polling. Default = 0 (use irq)");
211
212/* Control Polling Rate */
213static int scan_rate = 80;
214module_param(scan_rate, int, 0644);
215MODULE_PARM_DESC(scan_rate, "Polling rate in times/sec. Default = 80");
216
217/* The main device structure */
218struct synaptics_i2c {
219 struct i2c_client *client;
220 struct input_dev *input;
221 struct delayed_work dwork;
Dmitry Torokhov30b37132009-09-16 01:06:42 -0700222 spinlock_t lock;
Mike Rapoporteef3e4c2009-06-11 08:08:39 -0700223 int no_data_count;
224 int no_decel_param;
225 int reduce_report_param;
226 int no_filter_param;
227 int scan_rate_param;
228 int scan_ms;
229};
230
231static inline void set_scan_rate(struct synaptics_i2c *touch, int scan_rate)
232{
233 touch->scan_ms = MSEC_PER_SEC / scan_rate;
234 touch->scan_rate_param = scan_rate;
235}
236
237/*
238 * Driver's initial design makes no race condition possible on i2c bus,
239 * so there is no need in any locking.
240 * Keep it in mind, while playing with the code.
241 */
242static s32 synaptics_i2c_reg_get(struct i2c_client *client, u16 reg)
243{
244 int ret;
245
246 ret = i2c_smbus_write_byte_data(client, PAGE_SEL_REG, reg >> 8);
247 if (ret == 0)
248 ret = i2c_smbus_read_byte_data(client, reg & 0xff);
249
250 return ret;
251}
252
253static s32 synaptics_i2c_reg_set(struct i2c_client *client, u16 reg, u8 val)
254{
255 int ret;
256
257 ret = i2c_smbus_write_byte_data(client, PAGE_SEL_REG, reg >> 8);
258 if (ret == 0)
259 ret = i2c_smbus_write_byte_data(client, reg & 0xff, val);
260
261 return ret;
262}
263
264static s32 synaptics_i2c_word_get(struct i2c_client *client, u16 reg)
265{
266 int ret;
267
268 ret = i2c_smbus_write_byte_data(client, PAGE_SEL_REG, reg >> 8);
269 if (ret == 0)
270 ret = i2c_smbus_read_word_data(client, reg & 0xff);
271
272 return ret;
273}
274
275static int synaptics_i2c_config(struct i2c_client *client)
276{
277 int ret, control;
278 u8 int_en;
279
280 /* set Report Rate to Device Highest (>=80) and Sleep to normal */
281 ret = synaptics_i2c_reg_set(client, DEV_CONTROL_REG, 0xc1);
282 if (ret)
283 return ret;
284
285 /* set Interrupt Disable to Func20 / Enable to Func10) */
286 int_en = (polling_req) ? 0 : INT_ENA_ABS_MSK | INT_ENA_REL_MSK;
287 ret = synaptics_i2c_reg_set(client, INTERRUPT_EN_REG, int_en);
288 if (ret)
289 return ret;
290
291 control = synaptics_i2c_reg_get(client, GENERAL_2D_CONTROL_REG);
292 /* No Deceleration */
293 control |= no_decel ? 1 << NO_DECELERATION : 0;
294 /* Reduced Reporting */
295 control |= reduce_report ? 1 << REDUCE_REPORTING : 0;
296 /* No Filter */
297 control |= no_filter ? 1 << NO_FILTER : 0;
298 ret = synaptics_i2c_reg_set(client, GENERAL_2D_CONTROL_REG, control);
299 if (ret)
300 return ret;
301
302 return 0;
303}
304
305static int synaptics_i2c_reset_config(struct i2c_client *client)
306{
307 int ret;
308
309 /* Reset the Touchpad */
310 ret = synaptics_i2c_reg_set(client, DEV_COMMAND_REG, RESET_COMMAND);
311 if (ret) {
312 dev_err(&client->dev, "Unable to reset device\n");
313 } else {
314 msleep(SOFT_RESET_DELAY_MS);
315 ret = synaptics_i2c_config(client);
316 if (ret)
317 dev_err(&client->dev, "Unable to config device\n");
318 }
319
320 return ret;
321}
322
323static int synaptics_i2c_check_error(struct i2c_client *client)
324{
325 int status, ret = 0;
326
327 status = i2c_smbus_read_byte_data(client, DEVICE_STATUS_REG) &
328 (CONFIGURED_MSK | ERROR_MSK);
329
330 if (status != CONFIGURED_MSK)
331 ret = synaptics_i2c_reset_config(client);
332
333 return ret;
334}
335
336static bool synaptics_i2c_get_input(struct synaptics_i2c *touch)
337{
338 struct input_dev *input = touch->input;
339 int xy_delta, gesture;
340 s32 data;
341 s8 x_delta, y_delta;
342
343 /* Deal with spontanious resets and errors */
344 if (synaptics_i2c_check_error(touch->client))
345 return 0;
346
347 /* Get Gesture Bit */
348 data = synaptics_i2c_reg_get(touch->client, DATA_REG0);
349 gesture = (data >> GESTURE) & 0x1;
350
351 /*
352 * Get Relative axes. we have to get them in one shot,
353 * so we get 2 bytes starting from REL_X_REG.
354 */
355 xy_delta = synaptics_i2c_word_get(touch->client, REL_X_REG) & 0xffff;
356
357 /* Separate X from Y */
358 x_delta = xy_delta & 0xff;
359 y_delta = (xy_delta >> REGISTER_LENGTH) & 0xff;
360
361 /* Report the button event */
362 input_report_key(input, BTN_LEFT, gesture);
363
364 /* Report the deltas */
365 input_report_rel(input, REL_X, x_delta);
366 input_report_rel(input, REL_Y, -y_delta);
367 input_sync(input);
368
369 return xy_delta || gesture;
370}
371
Dmitry Torokhov30b37132009-09-16 01:06:42 -0700372static void synaptics_i2c_reschedule_work(struct synaptics_i2c *touch,
373 unsigned long delay)
374{
375 unsigned long flags;
376
377 spin_lock_irqsave(&touch->lock, flags);
378
Tejun Heoe7c2f962012-08-21 13:18:24 -0700379 mod_delayed_work(system_wq, &touch->dwork, delay);
Dmitry Torokhov30b37132009-09-16 01:06:42 -0700380
381 spin_unlock_irqrestore(&touch->lock, flags);
382}
383
Mike Rapoporteef3e4c2009-06-11 08:08:39 -0700384static irqreturn_t synaptics_i2c_irq(int irq, void *dev_id)
385{
386 struct synaptics_i2c *touch = dev_id;
387
Dmitry Torokhov30b37132009-09-16 01:06:42 -0700388 synaptics_i2c_reschedule_work(touch, 0);
Mike Rapoporteef3e4c2009-06-11 08:08:39 -0700389
390 return IRQ_HANDLED;
391}
392
393static void synaptics_i2c_check_params(struct synaptics_i2c *touch)
394{
395 bool reset = false;
396
397 if (scan_rate != touch->scan_rate_param)
398 set_scan_rate(touch, scan_rate);
399
400 if (no_decel != touch->no_decel_param) {
401 touch->no_decel_param = no_decel;
402 reset = true;
403 }
404
405 if (no_filter != touch->no_filter_param) {
406 touch->no_filter_param = no_filter;
407 reset = true;
408 }
409
410 if (reduce_report != touch->reduce_report_param) {
411 touch->reduce_report_param = reduce_report;
412 reset = true;
413 }
414
415 if (reset)
416 synaptics_i2c_reset_config(touch->client);
417}
418
419/* Control the Device polling rate / Work Handler sleep time */
Dmitry Torokhovf5ba3502009-11-02 21:57:40 -0800420static unsigned long synaptics_i2c_adjust_delay(struct synaptics_i2c *touch,
421 bool have_data)
Mike Rapoporteef3e4c2009-06-11 08:08:39 -0700422{
423 unsigned long delay, nodata_count_thres;
424
425 if (polling_req) {
426 delay = touch->scan_ms;
427 if (have_data) {
428 touch->no_data_count = 0;
429 } else {
430 nodata_count_thres = NO_DATA_THRES / touch->scan_ms;
431 if (touch->no_data_count < nodata_count_thres)
432 touch->no_data_count++;
433 else
434 delay = NO_DATA_SLEEP_MSECS;
435 }
436 return msecs_to_jiffies(delay);
437 } else {
438 delay = msecs_to_jiffies(THREAD_IRQ_SLEEP_MSECS);
439 return round_jiffies_relative(delay);
440 }
441}
442
443/* Work Handler */
444static void synaptics_i2c_work_handler(struct work_struct *work)
445{
446 bool have_data;
447 struct synaptics_i2c *touch =
448 container_of(work, struct synaptics_i2c, dwork.work);
449 unsigned long delay;
450
451 synaptics_i2c_check_params(touch);
452
453 have_data = synaptics_i2c_get_input(touch);
454 delay = synaptics_i2c_adjust_delay(touch, have_data);
455
456 /*
457 * While interrupt driven, there is no real need to poll the device.
458 * But touchpads are very sensitive, so there could be errors
459 * related to physical environment and the attention line isn't
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300460 * necessarily asserted. In such case we can lose the touchpad.
Mike Rapoporteef3e4c2009-06-11 08:08:39 -0700461 * We poll the device once in THREAD_IRQ_SLEEP_SECS and
462 * if error is detected, we try to reset and reconfigure the touchpad.
463 */
Dmitry Torokhov30b37132009-09-16 01:06:42 -0700464 synaptics_i2c_reschedule_work(touch, delay);
Mike Rapoporteef3e4c2009-06-11 08:08:39 -0700465}
466
467static int synaptics_i2c_open(struct input_dev *input)
468{
469 struct synaptics_i2c *touch = input_get_drvdata(input);
470 int ret;
471
472 ret = synaptics_i2c_reset_config(touch->client);
473 if (ret)
474 return ret;
475
476 if (polling_req)
Dmitry Torokhov30b37132009-09-16 01:06:42 -0700477 synaptics_i2c_reschedule_work(touch,
478 msecs_to_jiffies(NO_DATA_SLEEP_MSECS));
Mike Rapoporteef3e4c2009-06-11 08:08:39 -0700479
480 return 0;
481}
482
483static void synaptics_i2c_close(struct input_dev *input)
484{
485 struct synaptics_i2c *touch = input_get_drvdata(input);
486
487 if (!polling_req)
488 synaptics_i2c_reg_set(touch->client, INTERRUPT_EN_REG, 0);
489
490 cancel_delayed_work_sync(&touch->dwork);
491
492 /* Save some power */
493 synaptics_i2c_reg_set(touch->client, DEV_CONTROL_REG, DEEP_SLEEP);
494}
495
496static void synaptics_i2c_set_input_params(struct synaptics_i2c *touch)
497{
498 struct input_dev *input = touch->input;
499
500 input->name = touch->client->name;
501 input->phys = touch->client->adapter->name;
502 input->id.bustype = BUS_I2C;
503 input->id.version = synaptics_i2c_word_get(touch->client,
504 INFO_QUERY_REG0);
505 input->dev.parent = &touch->client->dev;
506 input->open = synaptics_i2c_open;
507 input->close = synaptics_i2c_close;
508 input_set_drvdata(input, touch);
509
510 /* Register the device as mouse */
511 __set_bit(EV_REL, input->evbit);
512 __set_bit(REL_X, input->relbit);
513 __set_bit(REL_Y, input->relbit);
514
515 /* Register device's buttons and keys */
516 __set_bit(EV_KEY, input->evbit);
517 __set_bit(BTN_LEFT, input->keybit);
518}
519
Dmitry Torokhovf5ba3502009-11-02 21:57:40 -0800520static struct synaptics_i2c *synaptics_i2c_touch_create(struct i2c_client *client)
Mike Rapoporteef3e4c2009-06-11 08:08:39 -0700521{
522 struct synaptics_i2c *touch;
523
524 touch = kzalloc(sizeof(struct synaptics_i2c), GFP_KERNEL);
525 if (!touch)
526 return NULL;
527
528 touch->client = client;
529 touch->no_decel_param = no_decel;
530 touch->scan_rate_param = scan_rate;
531 set_scan_rate(touch, scan_rate);
532 INIT_DELAYED_WORK(&touch->dwork, synaptics_i2c_work_handler);
Dmitry Torokhov30b37132009-09-16 01:06:42 -0700533 spin_lock_init(&touch->lock);
Mike Rapoporteef3e4c2009-06-11 08:08:39 -0700534
535 return touch;
536}
537
Bill Pemberton5298cc42012-11-23 21:38:25 -0800538static int synaptics_i2c_probe(struct i2c_client *client,
Mike Rapoporteef3e4c2009-06-11 08:08:39 -0700539 const struct i2c_device_id *dev_id)
540{
541 int ret;
542 struct synaptics_i2c *touch;
543
544 touch = synaptics_i2c_touch_create(client);
545 if (!touch)
546 return -ENOMEM;
547
Mike Rapoporteef3e4c2009-06-11 08:08:39 -0700548 ret = synaptics_i2c_reset_config(client);
549 if (ret)
550 goto err_mem_free;
551
552 if (client->irq < 1)
Dmitry Torokhov30b37132009-09-16 01:06:42 -0700553 polling_req = true;
Mike Rapoporteef3e4c2009-06-11 08:08:39 -0700554
555 touch->input = input_allocate_device();
556 if (!touch->input) {
557 ret = -ENOMEM;
558 goto err_mem_free;
559 }
560
561 synaptics_i2c_set_input_params(touch);
562
563 if (!polling_req) {
564 dev_dbg(&touch->client->dev,
565 "Requesting IRQ: %d\n", touch->client->irq);
566
567 ret = request_irq(touch->client->irq, synaptics_i2c_irq,
Yong Zhangec4665c2011-09-07 14:04:16 -0700568 IRQ_TYPE_EDGE_FALLING,
Mike Rapoporteef3e4c2009-06-11 08:08:39 -0700569 DRIVER_NAME, touch);
570 if (ret) {
571 dev_warn(&touch->client->dev,
572 "IRQ request failed: %d, "
573 "falling back to polling\n", ret);
Dmitry Torokhov30b37132009-09-16 01:06:42 -0700574 polling_req = true;
Mike Rapoporteef3e4c2009-06-11 08:08:39 -0700575 synaptics_i2c_reg_set(touch->client,
576 INTERRUPT_EN_REG, 0);
577 }
578 }
579
580 if (polling_req)
581 dev_dbg(&touch->client->dev,
582 "Using polling at rate: %d times/sec\n", scan_rate);
583
584 /* Register the device in input subsystem */
585 ret = input_register_device(touch->input);
586 if (ret) {
587 dev_err(&client->dev,
588 "Input device register failed: %d\n", ret);
589 goto err_input_free;
590 }
Dmitry Torokhov30b37132009-09-16 01:06:42 -0700591
592 i2c_set_clientdata(client, touch);
593
Mike Rapoporteef3e4c2009-06-11 08:08:39 -0700594 return 0;
595
596err_input_free:
597 input_free_device(touch->input);
598err_mem_free:
Mike Rapoporteef3e4c2009-06-11 08:08:39 -0700599 kfree(touch);
600
601 return ret;
602}
603
Bill Pembertone2619cf2012-11-23 21:50:47 -0800604static int synaptics_i2c_remove(struct i2c_client *client)
Mike Rapoporteef3e4c2009-06-11 08:08:39 -0700605{
606 struct synaptics_i2c *touch = i2c_get_clientdata(client);
607
608 if (!polling_req)
Dmitry Torokhov30b37132009-09-16 01:06:42 -0700609 free_irq(client->irq, touch);
Mike Rapoporteef3e4c2009-06-11 08:08:39 -0700610
611 input_unregister_device(touch->input);
Mike Rapoporteef3e4c2009-06-11 08:08:39 -0700612 kfree(touch);
613
614 return 0;
615}
616
Dmitry Torokhov26e56eb2011-10-06 15:26:51 -0700617#ifdef CONFIG_PM_SLEEP
Mark Brown87b2c7d2011-02-11 08:53:33 -0800618static int synaptics_i2c_suspend(struct device *dev)
Mike Rapoporteef3e4c2009-06-11 08:08:39 -0700619{
Mark Brown87b2c7d2011-02-11 08:53:33 -0800620 struct i2c_client *client = to_i2c_client(dev);
Mike Rapoporteef3e4c2009-06-11 08:08:39 -0700621 struct synaptics_i2c *touch = i2c_get_clientdata(client);
622
623 cancel_delayed_work_sync(&touch->dwork);
624
625 /* Save some power */
626 synaptics_i2c_reg_set(touch->client, DEV_CONTROL_REG, DEEP_SLEEP);
627
628 return 0;
629}
630
Mark Brown87b2c7d2011-02-11 08:53:33 -0800631static int synaptics_i2c_resume(struct device *dev)
Mike Rapoporteef3e4c2009-06-11 08:08:39 -0700632{
633 int ret;
Mark Brown87b2c7d2011-02-11 08:53:33 -0800634 struct i2c_client *client = to_i2c_client(dev);
Mike Rapoporteef3e4c2009-06-11 08:08:39 -0700635 struct synaptics_i2c *touch = i2c_get_clientdata(client);
636
637 ret = synaptics_i2c_reset_config(client);
638 if (ret)
639 return ret;
640
Dmitry Torokhov30b37132009-09-16 01:06:42 -0700641 synaptics_i2c_reschedule_work(touch,
642 msecs_to_jiffies(NO_DATA_SLEEP_MSECS));
Mike Rapoporteef3e4c2009-06-11 08:08:39 -0700643
644 return 0;
645}
Mike Rapoporteef3e4c2009-06-11 08:08:39 -0700646#endif
647
Mark Brown87b2c7d2011-02-11 08:53:33 -0800648static SIMPLE_DEV_PM_OPS(synaptics_i2c_pm, synaptics_i2c_suspend,
649 synaptics_i2c_resume);
650
Mike Rapoporteef3e4c2009-06-11 08:08:39 -0700651static const struct i2c_device_id synaptics_i2c_id_table[] = {
652 { "synaptics_i2c", 0 },
653 { },
654};
655MODULE_DEVICE_TABLE(i2c, synaptics_i2c_id_table);
656
657static struct i2c_driver synaptics_i2c_driver = {
658 .driver = {
659 .name = DRIVER_NAME,
660 .owner = THIS_MODULE,
Mark Brown87b2c7d2011-02-11 08:53:33 -0800661 .pm = &synaptics_i2c_pm,
Mike Rapoporteef3e4c2009-06-11 08:08:39 -0700662 },
663
664 .probe = synaptics_i2c_probe,
Bill Pemberton1cb0aa82012-11-23 21:27:39 -0800665 .remove = synaptics_i2c_remove,
Mike Rapoporteef3e4c2009-06-11 08:08:39 -0700666
Mike Rapoporteef3e4c2009-06-11 08:08:39 -0700667 .id_table = synaptics_i2c_id_table,
668};
669
Axel Lin1b92c1c2012-03-16 23:05:41 -0700670module_i2c_driver(synaptics_i2c_driver);
Mike Rapoporteef3e4c2009-06-11 08:08:39 -0700671
672MODULE_DESCRIPTION("Synaptics I2C touchpad driver");
673MODULE_AUTHOR("Mike Rapoport, Igor Grinberg, Compulab");
674MODULE_LICENSE("GPL");
675