drivers/input/mouse/synaptics_i2c.c

   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_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 */
 188 static bool no_decel = 1;
 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         spinlock_t              lock;
 223         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
 231 static 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  */
 242 static 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
 253 static 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
 264 static 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
 275 static 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
 305 static 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
 323 static 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
 336 static 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
 372 static 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
 379         mod_delayed_work(system_wq, &touch->dwork, delay);
 380
 381         spin_unlock_irqrestore(&touch->lock, flags);
 382 }
 383
 384 static irqreturn_t synaptics_i2c_irq(int irq, void *dev_id)
 385 {
 386         struct synaptics_i2c *touch = dev_id;
 387
 388         synaptics_i2c_reschedule_work(touch, 0);
 389
 390         return IRQ_HANDLED;
 391 }
 392
 393 static 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 */
 420 static unsigned long synaptics_i2c_adjust_delay(struct synaptics_i2c *touch,
 421                                                 bool have_data)
 422 {
 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 */
 444 static 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
 460          * necessarily asserted. In such case we can lose the touchpad.
 461          * 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          */
 464         synaptics_i2c_reschedule_work(touch, delay);
 465 }
 466
 467 static 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)
 477                 synaptics_i2c_reschedule_work(touch,
 478                                 msecs_to_jiffies(NO_DATA_SLEEP_MSECS));
 479
 480         return 0;
 481 }
 482
 483 static 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
 496 static 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
 520 static struct synaptics_i2c *synaptics_i2c_touch_create(struct i2c_client *client)
 521 {
 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);
 533         spin_lock_init(&touch->lock);
 534
 535         return touch;
 536 }
 537
 538 static int __devinit synaptics_i2c_probe(struct i2c_client *client,
 539                                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
 548         ret = synaptics_i2c_reset_config(client);
 549         if (ret)
 550                 goto err_mem_free;
 551
 552         if (client->irq < 1)
 553                 polling_req = true;
 554
 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,
 568                                   IRQ_TYPE_EDGE_FALLING,
 569                                   DRIVER_NAME, touch);
 570                 if (ret) {
 571                         dev_warn(&touch->client->dev,
 572                                   "IRQ request failed: %d, "
 573                                   "falling back to polling\n", ret);
 574                         polling_req = true;
 575                         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         }
 591
 592         i2c_set_clientdata(client, touch);
 593
 594         return 0;
 595
 596 err_input_free:
 597         input_free_device(touch->input);
 598 err_mem_free:
 599         kfree(touch);
 600
 601         return ret;
 602 }
 603
 604 static int __devexit synaptics_i2c_remove(struct i2c_client *client)
 605 {
 606         struct synaptics_i2c *touch = i2c_get_clientdata(client);
 607
 608         if (!polling_req)
 609                 free_irq(client->irq, touch);
 610
 611         input_unregister_device(touch->input);
 612         kfree(touch);
 613
 614         return 0;
 615 }
 616
 617 #ifdef CONFIG_PM_SLEEP
 618 static int synaptics_i2c_suspend(struct device *dev)
 619 {
 620         struct i2c_client *client = to_i2c_client(dev);
 621         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
 631 static int synaptics_i2c_resume(struct device *dev)
 632 {
 633         int ret;
 634         struct i2c_client *client = to_i2c_client(dev);
 635         struct synaptics_i2c *touch = i2c_get_clientdata(client);
 636
 637         ret = synaptics_i2c_reset_config(client);
 638         if (ret)
 639                 return ret;
 640
 641         synaptics_i2c_reschedule_work(touch,
 642                                 msecs_to_jiffies(NO_DATA_SLEEP_MSECS));
 643
 644         return 0;
 645 }
 646 #endif
 647
 648 static SIMPLE_DEV_PM_OPS(synaptics_i2c_pm, synaptics_i2c_suspend,
 649                          synaptics_i2c_resume);
 650
 651 static const struct i2c_device_id synaptics_i2c_id_table[] = {
 652         { "synaptics_i2c", 0 },
 653         { },
 654 };
 655 MODULE_DEVICE_TABLE(i2c, synaptics_i2c_id_table);
 656
 657 static struct i2c_driver synaptics_i2c_driver = {
 658         .driver = {
 659                 .name   = DRIVER_NAME,
 660                 .owner  = THIS_MODULE,
 661                 .pm     = &synaptics_i2c_pm,
 662         },
 663
 664         .probe          = synaptics_i2c_probe,
 665         .remove         = __devexit_p(synaptics_i2c_remove),
 666
 667         .id_table       = synaptics_i2c_id_table,
 668 };
 669
 670 module_i2c_driver(synaptics_i2c_driver);
 671
 672 MODULE_DESCRIPTION("Synaptics I2C touchpad driver");
 673 MODULE_AUTHOR("Mike Rapoport, Igor Grinberg, Compulab");
 674 MODULE_LICENSE("GPL");
 675