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
  22 #define DRIVER_NAME             "synaptics_i2c"
  23 /* maximum product id is 15 characters */
  24 #define PRODUCT_ID_LENGTH       15
  25 #define REGISTER_LENGTH         8
  26
  27 /*
  28  * after soft reset, we should wait for 1 ms
  29  * before the device becomes operational
  30  */
  31 #define SOFT_RESET_DELAY_MS     3
  32 /* and after hard reset, we should wait for max 500ms */
  33 #define HARD_RESET_DELAY_MS     500
  34
  35 /* Registers by SMBus address */
  36 #define PAGE_SEL_REG            0xff
  37 #define DEVICE_STATUS_REG       0x09
  38
  39 /* Registers by RMI address */
  40 #define DEV_CONTROL_REG         0x0000
  41 #define INTERRUPT_EN_REG        0x0001
  42 #define ERR_STAT_REG            0x0002
  43 #define INT_REQ_STAT_REG        0x0003
  44 #define DEV_COMMAND_REG         0x0004
  45
  46 #define RMI_PROT_VER_REG        0x0200
  47 #define MANUFACT_ID_REG         0x0201
  48 #define PHYS_INT_VER_REG        0x0202
  49 #define PROD_PROPERTY_REG       0x0203
  50 #define INFO_QUERY_REG0         0x0204
  51 #define INFO_QUERY_REG1         (INFO_QUERY_REG0 + 1)
  52 #define INFO_QUERY_REG2         (INFO_QUERY_REG0 + 2)
  53 #define INFO_QUERY_REG3         (INFO_QUERY_REG0 + 3)
  54
  55 #define PRODUCT_ID_REG0         0x0210
  56 #define PRODUCT_ID_REG1         (PRODUCT_ID_REG0 + 1)
  57 #define PRODUCT_ID_REG2         (PRODUCT_ID_REG0 + 2)
  58 #define PRODUCT_ID_REG3         (PRODUCT_ID_REG0 + 3)
  59 #define PRODUCT_ID_REG4         (PRODUCT_ID_REG0 + 4)
  60 #define PRODUCT_ID_REG5         (PRODUCT_ID_REG0 + 5)
  61 #define PRODUCT_ID_REG6         (PRODUCT_ID_REG0 + 6)
  62 #define PRODUCT_ID_REG7         (PRODUCT_ID_REG0 + 7)
  63 #define PRODUCT_ID_REG8         (PRODUCT_ID_REG0 + 8)
  64 #define PRODUCT_ID_REG9         (PRODUCT_ID_REG0 + 9)
  65 #define PRODUCT_ID_REG10        (PRODUCT_ID_REG0 + 10)
  66 #define PRODUCT_ID_REG11        (PRODUCT_ID_REG0 + 11)
  67 #define PRODUCT_ID_REG12        (PRODUCT_ID_REG0 + 12)
  68 #define PRODUCT_ID_REG13        (PRODUCT_ID_REG0 + 13)
  69 #define PRODUCT_ID_REG14        (PRODUCT_ID_REG0 + 14)
  70 #define PRODUCT_ID_REG15        (PRODUCT_ID_REG0 + 15)
  71
  72 #define DATA_REG0               0x0400
  73 #define ABS_PRESSURE_REG        0x0401
  74 #define ABS_MSB_X_REG           0x0402
  75 #define ABS_LSB_X_REG           (ABS_MSB_X_REG + 1)
  76 #define ABS_MSB_Y_REG           0x0404
  77 #define ABS_LSB_Y_REG           (ABS_MSB_Y_REG + 1)
  78 #define REL_X_REG               0x0406
  79 #define REL_Y_REG               0x0407
  80
  81 #define DEV_QUERY_REG0          0x1000
  82 #define DEV_QUERY_REG1          (DEV_QUERY_REG0 + 1)
  83 #define DEV_QUERY_REG2          (DEV_QUERY_REG0 + 2)
  84 #define DEV_QUERY_REG3          (DEV_QUERY_REG0 + 3)
  85 #define DEV_QUERY_REG4          (DEV_QUERY_REG0 + 4)
  86 #define DEV_QUERY_REG5          (DEV_QUERY_REG0 + 5)
  87 #define DEV_QUERY_REG6          (DEV_QUERY_REG0 + 6)
  88 #define DEV_QUERY_REG7          (DEV_QUERY_REG0 + 7)
  89 #define DEV_QUERY_REG8          (DEV_QUERY_REG0 + 8)
  90
  91 #define GENERAL_2D_CONTROL_REG  0x1041
  92 #define SENSOR_SENSITIVITY_REG  0x1044
  93 #define SENS_MAX_POS_MSB_REG    0x1046
  94 #define SENS_MAX_POS_LSB_REG    (SENS_MAX_POS_UPPER_REG + 1)
  95
  96 /* Register bits */
  97 /* Device Control Register Bits */
  98 #define REPORT_RATE_1ST_BIT     6
  99
 100 /* Interrupt Enable Register Bits (INTERRUPT_EN_REG) */
 101 #define F10_ABS_INT_ENA         0
 102 #define F10_REL_INT_ENA         1
 103 #define F20_INT_ENA             2
 104
 105 /* Interrupt Request Register Bits (INT_REQ_STAT_REG | DEVICE_STATUS_REG) */
 106 #define F10_ABS_INT_REQ         0
 107 #define F10_REL_INT_REQ         1
 108 #define F20_INT_REQ             2
 109 /* Device Status Register Bits (DEVICE_STATUS_REG) */
 110 #define STAT_CONFIGURED         6
 111 #define STAT_ERROR              7
 112
 113 /* Device Command Register Bits (DEV_COMMAND_REG) */
 114 #define RESET_COMMAND           0x01
 115 #define REZERO_COMMAND          0x02
 116
 117 /* Data Register 0 Bits (DATA_REG0) */
 118 #define GESTURE                 3
 119
 120 /* Device Query Registers Bits */
 121 /* DEV_QUERY_REG3 */
 122 #define HAS_PALM_DETECT         1
 123 #define HAS_MULTI_FING          2
 124 #define HAS_SCROLLER            4
 125 #define HAS_2D_SCROLL           5
 126
 127 /* General 2D Control Register Bits (GENERAL_2D_CONTROL_REG) */
 128 #define NO_DECELERATION         1
 129 #define REDUCE_REPORTING        3
 130 #define NO_FILTER               5
 131
 132 /* Function Masks */
 133 /* Device Control Register Masks (DEV_CONTROL_REG) */
 134 #define REPORT_RATE_MSK         0xc0
 135 #define SLEEP_MODE_MSK          0x07
 136
 137 /* Device Sleep Modes */
 138 #define FULL_AWAKE              0x0
 139 #define NORMAL_OP               0x1
 140 #define LOW_PWR_OP              0x2
 141 #define VERY_LOW_PWR_OP         0x3
 142 #define SENS_SLEEP              0x4
 143 #define SLEEP_MOD               0x5
 144 #define DEEP_SLEEP              0x6
 145 #define HIBERNATE               0x7
 146
 147 /* Interrupt Register Mask */
 148 /* (INT_REQ_STAT_REG | DEVICE_STATUS_REG | INTERRUPT_EN_REG) */
 149 #define INT_ENA_REQ_MSK         0x07
 150 #define INT_ENA_ABS_MSK         0x01
 151 #define INT_ENA_REL_MSK         0x02
 152 #define INT_ENA_F20_MSK         0x04
 153
 154 /* Device Status Register Masks (DEVICE_STATUS_REG) */
 155 #define CONFIGURED_MSK          0x40
 156 #define ERROR_MSK               0x80
 157
 158 /* Data Register 0 Masks */
 159 #define FINGER_WIDTH_MSK        0xf0
 160 #define GESTURE_MSK             0x08
 161 #define SENSOR_STATUS_MSK       0x07
 162
 163 /*
 164  * MSB Position Register Masks
 165  * ABS_MSB_X_REG | ABS_MSB_Y_REG | SENS_MAX_POS_MSB_REG |
 166  * DEV_QUERY_REG3 | DEV_QUERY_REG5
 167  */
 168 #define MSB_POSITION_MSK        0x1f
 169
 170 /* Device Query Registers Masks */
 171
 172 /* DEV_QUERY_REG2 */
 173 #define NUM_EXTRA_POS_MSK       0x07
 174
 175 /* When in IRQ mode read the device every THREAD_IRQ_SLEEP_SECS */
 176 #define THREAD_IRQ_SLEEP_SECS   2
 177 #define THREAD_IRQ_SLEEP_MSECS  (THREAD_IRQ_SLEEP_SECS * MSEC_PER_SEC)
 178
 179 /*
 180  * When in Polling mode and no data received for NO_DATA_THRES msecs
 181  * reduce the polling rate to NO_DATA_SLEEP_MSECS
 182  */
 183 #define NO_DATA_THRES           (MSEC_PER_SEC)
 184 #define NO_DATA_SLEEP_MSECS     (MSEC_PER_SEC / 4)
 185
 186 /* Control touchpad's No Deceleration option */
 187 static int no_decel = 1;
 188 module_param(no_decel, bool, 0644);
 189 MODULE_PARM_DESC(no_decel, "No Deceleration. Default = 1 (on)");
 190
 191 /* Control touchpad's Reduced Reporting option */
 192 static int reduce_report;
 193 module_param(reduce_report, bool, 0644);
 194 MODULE_PARM_DESC(reduce_report, "Reduced Reporting. Default = 0 (off)");
 195
 196 /* Control touchpad's No Filter option */
 197 static int no_filter;
 198 module_param(no_filter, bool, 0644);
 199 MODULE_PARM_DESC(no_filter, "No Filter. Default = 0 (off)");
 200
 201 /*
 202  * touchpad Attention line is Active Low and Open Drain,
 203  * therefore should be connected to pulled up line
 204  * and the irq configuration should be set to Falling Edge Trigger
 205  */
 206 /* Control IRQ / Polling option */
 207 static bool polling_req;
 208 module_param(polling_req, bool, 0444);
 209 MODULE_PARM_DESC(polling_req, "Request Polling. Default = 0 (use irq)");
 210
 211 /* Control Polling Rate */
 212 static int scan_rate = 80;
 213 module_param(scan_rate, int, 0644);
 214 MODULE_PARM_DESC(scan_rate, "Polling rate in times/sec. Default = 80");
 215
 216 /* The main device structure */
 217 struct synaptics_i2c {
 218         struct i2c_client       *client;
 219         struct input_dev        *input;
 220         struct delayed_work     dwork;
 221         spinlock_t              lock;
 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
 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  */
 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
 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
 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
 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
 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                 msleep(SOFT_RESET_DELAY_MS);
 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
 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
 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 spontanious resets and errors */
 343         if (synaptics_i2c_check_error(touch->client))
 344                 return 0;
 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
 371 static void synaptics_i2c_reschedule_work(struct synaptics_i2c *touch,
 372                                           unsigned long delay)
 373 {
 374         unsigned long flags;
 375
 376         spin_lock_irqsave(&touch->lock, flags);
 377
 378         /*
 379          * If work is already scheduled then subsequent schedules will not
 380          * change the scheduled time that's why we have to cancel it first.
 381          */
 382         __cancel_delayed_work(&touch->dwork);
 383         schedule_delayed_work(&touch->dwork, delay);
 384
 385         spin_unlock_irqrestore(&touch->lock, flags);
 386 }
 387
 388 static irqreturn_t synaptics_i2c_irq(int irq, void *dev_id)
 389 {
 390         struct synaptics_i2c *touch = dev_id;
 391
 392         synaptics_i2c_reschedule_work(touch, 0);
 393
 394         return IRQ_HANDLED;
 395 }
 396
 397 static void synaptics_i2c_check_params(struct synaptics_i2c *touch)
 398 {
 399         bool reset = false;
 400
 401         if (scan_rate != touch->scan_rate_param)
 402                 set_scan_rate(touch, scan_rate);
 403
 404         if (no_decel != touch->no_decel_param) {
 405                 touch->no_decel_param = no_decel;
 406                 reset = true;
 407         }
 408
 409         if (no_filter != touch->no_filter_param) {
 410                 touch->no_filter_param = no_filter;
 411                 reset = true;
 412         }
 413
 414         if (reduce_report != touch->reduce_report_param) {
 415                 touch->reduce_report_param = reduce_report;
 416                 reset = true;
 417         }
 418
 419         if (reset)
 420                 synaptics_i2c_reset_config(touch->client);
 421 }
 422
 423 /* Control the Device polling rate / Work Handler sleep time */
 424 static unsigned long synaptics_i2c_adjust_delay(struct synaptics_i2c *touch,
 425                                                 bool have_data)
 426 {
 427         unsigned long delay, nodata_count_thres;
 428
 429         if (polling_req) {
 430                 delay = touch->scan_ms;
 431                 if (have_data) {
 432                         touch->no_data_count = 0;
 433                 } else {
 434                         nodata_count_thres = NO_DATA_THRES / touch->scan_ms;
 435                         if (touch->no_data_count < nodata_count_thres)
 436                                 touch->no_data_count++;
 437                         else
 438                                 delay = NO_DATA_SLEEP_MSECS;
 439                 }
 440                 return msecs_to_jiffies(delay);
 441         } else {
 442                 delay = msecs_to_jiffies(THREAD_IRQ_SLEEP_MSECS);
 443                 return round_jiffies_relative(delay);
 444         }
 445 }
 446
 447 /* Work Handler */
 448 static void synaptics_i2c_work_handler(struct work_struct *work)
 449 {
 450         bool have_data;
 451         struct synaptics_i2c *touch =
 452                         container_of(work, struct synaptics_i2c, dwork.work);
 453         unsigned long delay;
 454
 455         synaptics_i2c_check_params(touch);
 456
 457         have_data = synaptics_i2c_get_input(touch);
 458         delay = synaptics_i2c_adjust_delay(touch, have_data);
 459
 460         /*
 461          * While interrupt driven, there is no real need to poll the device.
 462          * But touchpads are very sensitive, so there could be errors
 463          * related to physical environment and the attention line isn't
 464          * neccesarily asserted. In such case we can lose the touchpad.
 465          * We poll the device once in THREAD_IRQ_SLEEP_SECS and
 466          * if error is detected, we try to reset and reconfigure the touchpad.
 467          */
 468         synaptics_i2c_reschedule_work(touch, delay);
 469 }
 470
 471 static int synaptics_i2c_open(struct input_dev *input)
 472 {
 473         struct synaptics_i2c *touch = input_get_drvdata(input);
 474         int ret;
 475
 476         ret = synaptics_i2c_reset_config(touch->client);
 477         if (ret)
 478                 return ret;
 479
 480         if (polling_req)
 481                 synaptics_i2c_reschedule_work(touch,
 482                                 msecs_to_jiffies(NO_DATA_SLEEP_MSECS));
 483
 484         return 0;
 485 }
 486
 487 static void synaptics_i2c_close(struct input_dev *input)
 488 {
 489         struct synaptics_i2c *touch = input_get_drvdata(input);
 490
 491         if (!polling_req)
 492                 synaptics_i2c_reg_set(touch->client, INTERRUPT_EN_REG, 0);
 493
 494         cancel_delayed_work_sync(&touch->dwork);
 495
 496         /* Save some power */
 497         synaptics_i2c_reg_set(touch->client, DEV_CONTROL_REG, DEEP_SLEEP);
 498 }
 499
 500 static void synaptics_i2c_set_input_params(struct synaptics_i2c *touch)
 501 {
 502         struct input_dev *input = touch->input;
 503
 504         input->name = touch->client->name;
 505         input->phys = touch->client->adapter->name;
 506         input->id.bustype = BUS_I2C;
 507         input->id.version = synaptics_i2c_word_get(touch->client,
 508                                                    INFO_QUERY_REG0);
 509         input->dev.parent = &touch->client->dev;
 510         input->open = synaptics_i2c_open;
 511         input->close = synaptics_i2c_close;
 512         input_set_drvdata(input, touch);
 513
 514         /* Register the device as mouse */
 515         __set_bit(EV_REL, input->evbit);
 516         __set_bit(REL_X, input->relbit);
 517         __set_bit(REL_Y, input->relbit);
 518
 519         /* Register device's buttons and keys */
 520         __set_bit(EV_KEY, input->evbit);
 521         __set_bit(BTN_LEFT, input->keybit);
 522 }
 523
 524 static struct synaptics_i2c *synaptics_i2c_touch_create(struct i2c_client *client)
 525 {
 526         struct synaptics_i2c *touch;
 527
 528         touch = kzalloc(sizeof(struct synaptics_i2c), GFP_KERNEL);
 529         if (!touch)
 530                 return NULL;
 531
 532         touch->client = client;
 533         touch->no_decel_param = no_decel;
 534         touch->scan_rate_param = scan_rate;
 535         set_scan_rate(touch, scan_rate);
 536         INIT_DELAYED_WORK(&touch->dwork, synaptics_i2c_work_handler);
 537         spin_lock_init(&touch->lock);
 538
 539         return touch;
 540 }
 541
 542 static int __devinit synaptics_i2c_probe(struct i2c_client *client,
 543                                const struct i2c_device_id *dev_id)
 544 {
 545         int ret;
 546         struct synaptics_i2c *touch;
 547
 548         touch = synaptics_i2c_touch_create(client);
 549         if (!touch)
 550                 return -ENOMEM;
 551
 552         ret = synaptics_i2c_reset_config(client);
 553         if (ret)
 554                 goto err_mem_free;
 555
 556         if (client->irq < 1)
 557                 polling_req = true;
 558
 559         touch->input = input_allocate_device();
 560         if (!touch->input) {
 561                 ret = -ENOMEM;
 562                 goto err_mem_free;
 563         }
 564
 565         synaptics_i2c_set_input_params(touch);
 566
 567         if (!polling_req) {
 568                 dev_dbg(&touch->client->dev,
 569                          "Requesting IRQ: %d\n", touch->client->irq);
 570
 571                 ret = request_irq(touch->client->irq, synaptics_i2c_irq,
 572                                   IRQF_DISABLED|IRQ_TYPE_EDGE_FALLING,
 573                                   DRIVER_NAME, touch);
 574                 if (ret) {
 575                         dev_warn(&touch->client->dev,
 576                                   "IRQ request failed: %d, "
 577                                   "falling back to polling\n", ret);
 578                         polling_req = true;
 579                         synaptics_i2c_reg_set(touch->client,
 580                                               INTERRUPT_EN_REG, 0);
 581                 }
 582         }
 583
 584         if (polling_req)
 585                 dev_dbg(&touch->client->dev,
 586                          "Using polling at rate: %d times/sec\n", scan_rate);
 587
 588         /* Register the device in input subsystem */
 589         ret = input_register_device(touch->input);
 590         if (ret) {
 591                 dev_err(&client->dev,
 592                          "Input device register failed: %d\n", ret);
 593                 goto err_input_free;
 594         }
 595
 596         i2c_set_clientdata(client, touch);
 597
 598         return 0;
 599
 600 err_input_free:
 601         input_free_device(touch->input);
 602 err_mem_free:
 603         kfree(touch);
 604
 605         return ret;
 606 }
 607
 608 static int __devexit synaptics_i2c_remove(struct i2c_client *client)
 609 {
 610         struct synaptics_i2c *touch = i2c_get_clientdata(client);
 611
 612         if (!polling_req)
 613                 free_irq(client->irq, touch);
 614
 615         input_unregister_device(touch->input);
 616         i2c_set_clientdata(client, NULL);
 617         kfree(touch);
 618
 619         return 0;
 620 }
 621
 622 #ifdef CONFIG_PM
 623 static int synaptics_i2c_suspend(struct i2c_client *client, pm_message_t mesg)
 624 {
 625         struct synaptics_i2c *touch = i2c_get_clientdata(client);
 626
 627         cancel_delayed_work_sync(&touch->dwork);
 628
 629         /* Save some power */
 630         synaptics_i2c_reg_set(touch->client, DEV_CONTROL_REG, DEEP_SLEEP);
 631
 632         return 0;
 633 }
 634
 635 static int synaptics_i2c_resume(struct i2c_client *client)
 636 {
 637         int ret;
 638         struct synaptics_i2c *touch = i2c_get_clientdata(client);
 639
 640         ret = synaptics_i2c_reset_config(client);
 641         if (ret)
 642                 return ret;
 643
 644         synaptics_i2c_reschedule_work(touch,
 645                                 msecs_to_jiffies(NO_DATA_SLEEP_MSECS));
 646
 647         return 0;
 648 }
 649 #else
 650 #define synaptics_i2c_suspend   NULL
 651 #define synaptics_i2c_resume    NULL
 652 #endif
 653
 654 static const struct i2c_device_id synaptics_i2c_id_table[] = {
 655         { "synaptics_i2c", 0 },
 656         { },
 657 };
 658 MODULE_DEVICE_TABLE(i2c, synaptics_i2c_id_table);
 659
 660 static struct i2c_driver synaptics_i2c_driver = {
 661         .driver = {
 662                 .name   = DRIVER_NAME,
 663                 .owner  = THIS_MODULE,
 664         },
 665
 666         .probe          = synaptics_i2c_probe,
 667         .remove         = __devexit_p(synaptics_i2c_remove),
 668
 669         .suspend        = synaptics_i2c_suspend,
 670         .resume         = synaptics_i2c_resume,
 671         .id_table       = synaptics_i2c_id_table,
 672 };
 673
 674 static int __init synaptics_i2c_init(void)
 675 {
 676         return i2c_add_driver(&synaptics_i2c_driver);
 677 }
 678
 679 static void __exit synaptics_i2c_exit(void)
 680 {
 681         i2c_del_driver(&synaptics_i2c_driver);
 682 }
 683
 684 module_init(synaptics_i2c_init);
 685 module_exit(synaptics_i2c_exit);
 686
 687 MODULE_DESCRIPTION("Synaptics I2C touchpad driver");
 688 MODULE_AUTHOR("Mike Rapoport, Igor Grinberg, Compulab");
 689 MODULE_LICENSE("GPL");
 690