drivers/input/touchscreen/bu21013_ts.c

   1 /*
   2  * Copyright (C) ST-Ericsson SA 2010
   3  * Author: Naveen Kumar G <naveen.gaddipati@stericsson.com> for ST-Ericsson
   4  * License terms:GNU General Public License (GPL) version 2
   5  */
   6
   7 #include <linux/kernel.h>
   8 #include <linux/delay.h>
   9 #include <linux/interrupt.h>
  10 #include <linux/i2c.h>
  11 #include <linux/workqueue.h>
  12 #include <linux/input.h>
  13 #include <linux/input/bu21013.h>
  14 #include <linux/slab.h>
  15 #include <linux/regulator/consumer.h>
  16 #include <linux/module.h>
  17 #include <linux/gpio.h>
  18
  19 #define PEN_DOWN_INTR   0
  20 #define MAX_FINGERS     2
  21 #define RESET_DELAY     30
  22 #define PENUP_TIMEOUT   (10)
  23 #define DELTA_MIN       16
  24 #define MASK_BITS       0x03
  25 #define SHIFT_8         8
  26 #define SHIFT_2         2
  27 #define LENGTH_OF_BUFFER        11
  28 #define I2C_RETRY_COUNT 5
  29
  30 #define BU21013_SENSORS_BTN_0_7_REG     0x70
  31 #define BU21013_SENSORS_BTN_8_15_REG    0x71
  32 #define BU21013_SENSORS_BTN_16_23_REG   0x72
  33 #define BU21013_X1_POS_MSB_REG          0x73
  34 #define BU21013_X1_POS_LSB_REG          0x74
  35 #define BU21013_Y1_POS_MSB_REG          0x75
  36 #define BU21013_Y1_POS_LSB_REG          0x76
  37 #define BU21013_X2_POS_MSB_REG          0x77
  38 #define BU21013_X2_POS_LSB_REG          0x78
  39 #define BU21013_Y2_POS_MSB_REG          0x79
  40 #define BU21013_Y2_POS_LSB_REG          0x7A
  41 #define BU21013_INT_CLR_REG             0xE8
  42 #define BU21013_INT_MODE_REG            0xE9
  43 #define BU21013_GAIN_REG                0xEA
  44 #define BU21013_OFFSET_MODE_REG         0xEB
  45 #define BU21013_XY_EDGE_REG             0xEC
  46 #define BU21013_RESET_REG               0xED
  47 #define BU21013_CALIB_REG               0xEE
  48 #define BU21013_DONE_REG                0xEF
  49 #define BU21013_SENSOR_0_7_REG          0xF0
  50 #define BU21013_SENSOR_8_15_REG         0xF1
  51 #define BU21013_SENSOR_16_23_REG        0xF2
  52 #define BU21013_POS_MODE1_REG           0xF3
  53 #define BU21013_POS_MODE2_REG           0xF4
  54 #define BU21013_CLK_MODE_REG            0xF5
  55 #define BU21013_IDLE_REG                0xFA
  56 #define BU21013_FILTER_REG              0xFB
  57 #define BU21013_TH_ON_REG               0xFC
  58 #define BU21013_TH_OFF_REG              0xFD
  59
  60
  61 #define BU21013_RESET_ENABLE            0x01
  62
  63 #define BU21013_SENSORS_EN_0_7          0x3F
  64 #define BU21013_SENSORS_EN_8_15         0xFC
  65 #define BU21013_SENSORS_EN_16_23        0x1F
  66
  67 #define BU21013_POS_MODE1_0             0x02
  68 #define BU21013_POS_MODE1_1             0x04
  69 #define BU21013_POS_MODE1_2             0x08
  70
  71 #define BU21013_POS_MODE2_ZERO          0x01
  72 #define BU21013_POS_MODE2_AVG1          0x02
  73 #define BU21013_POS_MODE2_AVG2          0x04
  74 #define BU21013_POS_MODE2_EN_XY         0x08
  75 #define BU21013_POS_MODE2_EN_RAW        0x10
  76 #define BU21013_POS_MODE2_MULTI         0x80
  77
  78 #define BU21013_CLK_MODE_DIV            0x01
  79 #define BU21013_CLK_MODE_EXT            0x02
  80 #define BU21013_CLK_MODE_CALIB          0x80
  81
  82 #define BU21013_IDLET_0                 0x01
  83 #define BU21013_IDLET_1                 0x02
  84 #define BU21013_IDLET_2                 0x04
  85 #define BU21013_IDLET_3                 0x08
  86 #define BU21013_IDLE_INTERMIT_EN        0x10
  87
  88 #define BU21013_DELTA_0_6       0x7F
  89 #define BU21013_FILTER_EN       0x80
  90
  91 #define BU21013_INT_MODE_LEVEL  0x00
  92 #define BU21013_INT_MODE_EDGE   0x01
  93
  94 #define BU21013_GAIN_0          0x01
  95 #define BU21013_GAIN_1          0x02
  96 #define BU21013_GAIN_2          0x04
  97
  98 #define BU21013_OFFSET_MODE_DEFAULT     0x00
  99 #define BU21013_OFFSET_MODE_MOVE        0x01
 100 #define BU21013_OFFSET_MODE_DISABLE     0x02
 101
 102 #define BU21013_TH_ON_0         0x01
 103 #define BU21013_TH_ON_1         0x02
 104 #define BU21013_TH_ON_2         0x04
 105 #define BU21013_TH_ON_3         0x08
 106 #define BU21013_TH_ON_4         0x10
 107 #define BU21013_TH_ON_5         0x20
 108 #define BU21013_TH_ON_6         0x40
 109 #define BU21013_TH_ON_7         0x80
 110 #define BU21013_TH_ON_MAX       0xFF
 111
 112 #define BU21013_TH_OFF_0        0x01
 113 #define BU21013_TH_OFF_1        0x02
 114 #define BU21013_TH_OFF_2        0x04
 115 #define BU21013_TH_OFF_3        0x08
 116 #define BU21013_TH_OFF_4        0x10
 117 #define BU21013_TH_OFF_5        0x20
 118 #define BU21013_TH_OFF_6        0x40
 119 #define BU21013_TH_OFF_7        0x80
 120 #define BU21013_TH_OFF_MAX      0xFF
 121
 122 #define BU21013_X_EDGE_0        0x01
 123 #define BU21013_X_EDGE_1        0x02
 124 #define BU21013_X_EDGE_2        0x04
 125 #define BU21013_X_EDGE_3        0x08
 126 #define BU21013_Y_EDGE_0        0x10
 127 #define BU21013_Y_EDGE_1        0x20
 128 #define BU21013_Y_EDGE_2        0x40
 129 #define BU21013_Y_EDGE_3        0x80
 130
 131 #define BU21013_DONE    0x01
 132 #define BU21013_NUMBER_OF_X_SENSORS     (6)
 133 #define BU21013_NUMBER_OF_Y_SENSORS     (11)
 134
 135 #define DRIVER_TP       "bu21013_tp"
 136
 137 /**
 138  * struct bu21013_ts_data - touch panel data structure
 139  * @client: pointer to the i2c client
 140  * @wait: variable to wait_queue_head_t structure
 141  * @touch_stopped: touch stop flag
 142  * @chip: pointer to the touch panel controller
 143  * @in_dev: pointer to the input device structure
 144  * @intr_pin: interrupt pin value
 145  * @regulator: pointer to the Regulator used for touch screen
 146  *
 147  * Touch panel device data structure
 148  */
 149 struct bu21013_ts_data {
 150         struct i2c_client *client;
 151         wait_queue_head_t wait;
 152         const struct bu21013_platform_device *chip;
 153         struct input_dev *in_dev;
 154         struct regulator *regulator;
 155         unsigned int irq;
 156         unsigned int intr_pin;
 157         bool touch_stopped;
 158 };
 159
 160 /**
 161  * bu21013_read_block_data(): read the touch co-ordinates
 162  * @data: bu21013_ts_data structure pointer
 163  * @buf: byte pointer
 164  *
 165  * Read the touch co-ordinates using i2c read block into buffer
 166  * and returns integer.
 167  */
 168 static int bu21013_read_block_data(struct bu21013_ts_data *data, u8 *buf)
 169 {
 170         int ret, i;
 171
 172         for (i = 0; i < I2C_RETRY_COUNT; i++) {
 173                 ret = i2c_smbus_read_i2c_block_data
 174                         (data->client, BU21013_SENSORS_BTN_0_7_REG,
 175                                 LENGTH_OF_BUFFER, buf);
 176                 if (ret == LENGTH_OF_BUFFER)
 177                         return 0;
 178         }
 179         return -EINVAL;
 180 }
 181
 182 /**
 183  * bu21013_do_touch_report(): Get the touch co-ordinates
 184  * @data: bu21013_ts_data structure pointer
 185  *
 186  * Get the touch co-ordinates from touch sensor registers and writes
 187  * into device structure and returns integer.
 188  */
 189 static int bu21013_do_touch_report(struct bu21013_ts_data *data)
 190 {
 191         u8      buf[LENGTH_OF_BUFFER];
 192         unsigned int pos_x[2], pos_y[2];
 193         bool    has_x_sensors, has_y_sensors;
 194         int     finger_down_count = 0;
 195         int     i;
 196
 197         if (data == NULL)
 198                 return -EINVAL;
 199
 200         if (bu21013_read_block_data(data, buf) < 0)
 201                 return -EINVAL;
 202
 203         has_x_sensors = hweight32(buf[0] & BU21013_SENSORS_EN_0_7);
 204         has_y_sensors = hweight32(((buf[1] & BU21013_SENSORS_EN_8_15) |
 205                 ((buf[2] & BU21013_SENSORS_EN_16_23) << SHIFT_8)) >> SHIFT_2);
 206         if (!has_x_sensors || !has_y_sensors)
 207                 return 0;
 208
 209         for (i = 0; i < MAX_FINGERS; i++) {
 210                 const u8 *p = &buf[4 * i + 3];
 211                 unsigned int x = p[0] << SHIFT_2 | (p[1] & MASK_BITS);
 212                 unsigned int y = p[2] << SHIFT_2 | (p[3] & MASK_BITS);
 213                 if (x == 0 || y == 0)
 214                         continue;
 215                 pos_x[finger_down_count] = x;
 216                 pos_y[finger_down_count] = y;
 217                 finger_down_count++;
 218         }
 219
 220         if (finger_down_count) {
 221                 if (finger_down_count == 2 &&
 222                     (abs(pos_x[0] - pos_x[1]) < DELTA_MIN ||
 223                      abs(pos_y[0] - pos_y[1]) < DELTA_MIN)) {
 224                         return 0;
 225                 }
 226
 227                 for (i = 0; i < finger_down_count; i++) {
 228                         if (data->chip->x_flip)
 229                                 pos_x[i] = data->chip->touch_x_max - pos_x[i];
 230                         if (data->chip->y_flip)
 231                                 pos_y[i] = data->chip->touch_y_max - pos_y[i];
 232
 233                         input_report_abs(data->in_dev,
 234                                          ABS_MT_POSITION_X, pos_x[i]);
 235                         input_report_abs(data->in_dev,
 236                                          ABS_MT_POSITION_Y, pos_y[i]);
 237                         input_mt_sync(data->in_dev);
 238                 }
 239         } else
 240                 input_mt_sync(data->in_dev);
 241
 242         input_sync(data->in_dev);
 243
 244         return 0;
 245 }
 246 /**
 247  * bu21013_gpio_irq() - gpio thread function for touch interrupt
 248  * @irq: irq value
 249  * @device_data: void pointer
 250  *
 251  * This gpio thread function for touch interrupt
 252  * and returns irqreturn_t.
 253  */
 254 static irqreturn_t bu21013_gpio_irq(int irq, void *device_data)
 255 {
 256         struct bu21013_ts_data *data = device_data;
 257         struct i2c_client *i2c = data->client;
 258         int retval;
 259
 260         do {
 261                 retval = bu21013_do_touch_report(data);
 262                 if (retval < 0) {
 263                         dev_err(&i2c->dev, "bu21013_do_touch_report failed\n");
 264                         return IRQ_NONE;
 265                 }
 266
 267                 data->intr_pin = gpio_get_value(data->chip->touch_pin);
 268                 if (data->intr_pin == PEN_DOWN_INTR)
 269                         wait_event_timeout(data->wait, data->touch_stopped,
 270                                            msecs_to_jiffies(2));
 271         } while (!data->intr_pin && !data->touch_stopped);
 272
 273         return IRQ_HANDLED;
 274 }
 275
 276 /**
 277  * bu21013_init_chip() - power on sequence for the bu21013 controller
 278  * @data: device structure pointer
 279  *
 280  * This function is used to power on
 281  * the bu21013 controller and returns integer.
 282  */
 283 static int bu21013_init_chip(struct bu21013_ts_data *data)
 284 {
 285         int retval;
 286         struct i2c_client *i2c = data->client;
 287
 288         retval = i2c_smbus_write_byte_data(i2c, BU21013_RESET_REG,
 289                                         BU21013_RESET_ENABLE);
 290         if (retval < 0) {
 291                 dev_err(&i2c->dev, "BU21013_RESET reg write failed\n");
 292                 return retval;
 293         }
 294         msleep(RESET_DELAY);
 295
 296         retval = i2c_smbus_write_byte_data(i2c, BU21013_SENSOR_0_7_REG,
 297                                         BU21013_SENSORS_EN_0_7);
 298         if (retval < 0) {
 299                 dev_err(&i2c->dev, "BU21013_SENSOR_0_7 reg write failed\n");
 300                 return retval;
 301         }
 302
 303         retval = i2c_smbus_write_byte_data(i2c, BU21013_SENSOR_8_15_REG,
 304                                                 BU21013_SENSORS_EN_8_15);
 305         if (retval < 0) {
 306                 dev_err(&i2c->dev, "BU21013_SENSOR_8_15 reg write failed\n");
 307                 return retval;
 308         }
 309
 310         retval = i2c_smbus_write_byte_data(i2c, BU21013_SENSOR_16_23_REG,
 311                                                 BU21013_SENSORS_EN_16_23);
 312         if (retval < 0) {
 313                 dev_err(&i2c->dev, "BU21013_SENSOR_16_23 reg write failed\n");
 314                 return retval;
 315         }
 316
 317         retval = i2c_smbus_write_byte_data(i2c, BU21013_POS_MODE1_REG,
 318                                 (BU21013_POS_MODE1_0 | BU21013_POS_MODE1_1));
 319         if (retval < 0) {
 320                 dev_err(&i2c->dev, "BU21013_POS_MODE1 reg write failed\n");
 321                 return retval;
 322         }
 323
 324         retval = i2c_smbus_write_byte_data(i2c, BU21013_POS_MODE2_REG,
 325                         (BU21013_POS_MODE2_ZERO | BU21013_POS_MODE2_AVG1 |
 326                         BU21013_POS_MODE2_AVG2 | BU21013_POS_MODE2_EN_RAW |
 327                         BU21013_POS_MODE2_MULTI));
 328         if (retval < 0) {
 329                 dev_err(&i2c->dev, "BU21013_POS_MODE2 reg write failed\n");
 330                 return retval;
 331         }
 332
 333         if (data->chip->ext_clk)
 334                 retval = i2c_smbus_write_byte_data(i2c, BU21013_CLK_MODE_REG,
 335                         (BU21013_CLK_MODE_EXT | BU21013_CLK_MODE_CALIB));
 336         else
 337                 retval = i2c_smbus_write_byte_data(i2c, BU21013_CLK_MODE_REG,
 338                         (BU21013_CLK_MODE_DIV | BU21013_CLK_MODE_CALIB));
 339         if (retval < 0) {
 340                 dev_err(&i2c->dev, "BU21013_CLK_MODE reg write failed\n");
 341                 return retval;
 342         }
 343
 344         retval = i2c_smbus_write_byte_data(i2c, BU21013_IDLE_REG,
 345                                 (BU21013_IDLET_0 | BU21013_IDLE_INTERMIT_EN));
 346         if (retval < 0) {
 347                 dev_err(&i2c->dev, "BU21013_IDLE reg write failed\n");
 348                 return retval;
 349         }
 350
 351         retval = i2c_smbus_write_byte_data(i2c, BU21013_INT_MODE_REG,
 352                                                 BU21013_INT_MODE_LEVEL);
 353         if (retval < 0) {
 354                 dev_err(&i2c->dev, "BU21013_INT_MODE reg write failed\n");
 355                 return retval;
 356         }
 357
 358         retval = i2c_smbus_write_byte_data(i2c, BU21013_FILTER_REG,
 359                                                 (BU21013_DELTA_0_6 |
 360                                                         BU21013_FILTER_EN));
 361         if (retval < 0) {
 362                 dev_err(&i2c->dev, "BU21013_FILTER reg write failed\n");
 363                 return retval;
 364         }
 365
 366         retval = i2c_smbus_write_byte_data(i2c, BU21013_TH_ON_REG,
 367                                         BU21013_TH_ON_5);
 368         if (retval < 0) {
 369                 dev_err(&i2c->dev, "BU21013_TH_ON reg write failed\n");
 370                 return retval;
 371         }
 372
 373         retval = i2c_smbus_write_byte_data(i2c, BU21013_TH_OFF_REG,
 374                                 BU21013_TH_OFF_4 | BU21013_TH_OFF_3);
 375         if (retval < 0) {
 376                 dev_err(&i2c->dev, "BU21013_TH_OFF reg write failed\n");
 377                 return retval;
 378         }
 379
 380         retval = i2c_smbus_write_byte_data(i2c, BU21013_GAIN_REG,
 381                                         (BU21013_GAIN_0 | BU21013_GAIN_1));
 382         if (retval < 0) {
 383                 dev_err(&i2c->dev, "BU21013_GAIN reg write failed\n");
 384                 return retval;
 385         }
 386
 387         retval = i2c_smbus_write_byte_data(i2c, BU21013_OFFSET_MODE_REG,
 388                                         BU21013_OFFSET_MODE_DEFAULT);
 389         if (retval < 0) {
 390                 dev_err(&i2c->dev, "BU21013_OFFSET_MODE reg write failed\n");
 391                 return retval;
 392         }
 393
 394         retval = i2c_smbus_write_byte_data(i2c, BU21013_XY_EDGE_REG,
 395                                 (BU21013_X_EDGE_0 | BU21013_X_EDGE_2 |
 396                                 BU21013_Y_EDGE_1 | BU21013_Y_EDGE_3));
 397         if (retval < 0) {
 398                 dev_err(&i2c->dev, "BU21013_XY_EDGE reg write failed\n");
 399                 return retval;
 400         }
 401
 402         retval = i2c_smbus_write_byte_data(i2c, BU21013_DONE_REG,
 403                                                         BU21013_DONE);
 404         if (retval < 0) {
 405                 dev_err(&i2c->dev, "BU21013_REG_DONE reg write failed\n");
 406                 return retval;
 407         }
 408
 409         return 0;
 410 }
 411
 412 /**
 413  * bu21013_free_irq() - frees IRQ registered for touchscreen
 414  * @bu21013_data: device structure pointer
 415  *
 416  * This function signals interrupt thread to stop processing and
 417  * frees interrupt.
 418  */
 419 static void bu21013_free_irq(struct bu21013_ts_data *bu21013_data)
 420 {
 421         bu21013_data->touch_stopped = true;
 422         wake_up(&bu21013_data->wait);
 423         free_irq(bu21013_data->irq, bu21013_data);
 424 }
 425
 426 /**
 427  * bu21013_cs_disable() - deconfigures the touch panel controller
 428  * @bu21013_data: device structure pointer
 429  *
 430  * This function is used to deconfigure the chip selection
 431  * for touch panel controller.
 432  */
 433 static void bu21013_cs_disable(struct bu21013_ts_data *bu21013_data)
 434 {
 435         int error;
 436
 437         error = gpio_direction_output(bu21013_data->chip->cs_pin, 0);
 438         if (error < 0)
 439                 dev_warn(&bu21013_data->client->dev,
 440                          "%s: gpio direction failed, error: %d\n",
 441                          __func__, error);
 442         else
 443                 gpio_set_value(bu21013_data->chip->cs_pin, 0);
 444
 445         gpio_free(bu21013_data->chip->cs_pin);
 446 }
 447
 448
 449 /**
 450  * bu21013_probe() - initializes the i2c-client touchscreen driver
 451  * @client: i2c client structure pointer
 452  * @id: i2c device id pointer
 453  *
 454  * This function used to initializes the i2c-client touchscreen
 455  * driver and returns integer.
 456  */
 457 static int bu21013_probe(struct i2c_client *client,
 458                          const struct i2c_device_id *id)
 459 {
 460         struct bu21013_ts_data *bu21013_data;
 461         struct input_dev *in_dev;
 462         const struct bu21013_platform_device *pdata =
 463                                         client->dev.platform_data;
 464         int error;
 465
 466         if (!i2c_check_functionality(client->adapter,
 467                                         I2C_FUNC_SMBUS_BYTE_DATA)) {
 468                 dev_err(&client->dev, "i2c smbus byte data not supported\n");
 469                 return -EIO;
 470         }
 471
 472         if (!pdata) {
 473                 dev_err(&client->dev, "platform data not defined\n");
 474                 return -EINVAL;
 475         }
 476
 477         if (!gpio_is_valid(pdata->touch_pin)) {
 478                 dev_err(&client->dev, "invalid touch_pin supplied\n");
 479                 return -EINVAL;
 480         }
 481
 482         bu21013_data = kzalloc(sizeof(struct bu21013_ts_data), GFP_KERNEL);
 483         in_dev = input_allocate_device();
 484         if (!bu21013_data || !in_dev) {
 485                 dev_err(&client->dev, "device memory alloc failed\n");
 486                 error = -ENOMEM;
 487                 goto err_free_mem;
 488         }
 489
 490         bu21013_data->in_dev = in_dev;
 491         bu21013_data->chip = pdata;
 492         bu21013_data->client = client;
 493         bu21013_data->irq = gpio_to_irq(pdata->touch_pin);
 494
 495         bu21013_data->regulator = regulator_get(&client->dev, "avdd");
 496         if (IS_ERR(bu21013_data->regulator)) {
 497                 dev_err(&client->dev, "regulator_get failed\n");
 498                 error = PTR_ERR(bu21013_data->regulator);
 499                 goto err_free_mem;
 500         }
 501
 502         error = regulator_enable(bu21013_data->regulator);
 503         if (error < 0) {
 504                 dev_err(&client->dev, "regulator enable failed\n");
 505                 goto err_put_regulator;
 506         }
 507
 508         bu21013_data->touch_stopped = false;
 509         init_waitqueue_head(&bu21013_data->wait);
 510
 511         /* configure the gpio pins */
 512         error = gpio_request_one(pdata->cs_pin, GPIOF_OUT_INIT_HIGH,
 513                                  "touchp_reset");
 514         if (error < 0) {
 515                 dev_err(&client->dev, "Unable to request gpio reset_pin\n");
 516                 goto err_disable_regulator;
 517         }
 518
 519         /* configure the touch panel controller */
 520         error = bu21013_init_chip(bu21013_data);
 521         if (error) {
 522                 dev_err(&client->dev, "error in bu21013 config\n");
 523                 goto err_cs_disable;
 524         }
 525
 526         /* register the device to input subsystem */
 527         in_dev->name = DRIVER_TP;
 528         in_dev->id.bustype = BUS_I2C;
 529         in_dev->dev.parent = &client->dev;
 530
 531         __set_bit(EV_SYN, in_dev->evbit);
 532         __set_bit(EV_KEY, in_dev->evbit);
 533         __set_bit(EV_ABS, in_dev->evbit);
 534
 535         input_set_abs_params(in_dev, ABS_MT_POSITION_X, 0,
 536                                                 pdata->touch_x_max, 0, 0);
 537         input_set_abs_params(in_dev, ABS_MT_POSITION_Y, 0,
 538                                                 pdata->touch_y_max, 0, 0);
 539         input_set_drvdata(in_dev, bu21013_data);
 540
 541         error = request_threaded_irq(bu21013_data->irq, NULL, bu21013_gpio_irq,
 542                                      IRQF_TRIGGER_FALLING | IRQF_SHARED |
 543                                         IRQF_ONESHOT,
 544                                      DRIVER_TP, bu21013_data);
 545         if (error) {
 546                 dev_err(&client->dev, "request irq %d failed\n",
 547                         bu21013_data->irq);
 548                 goto err_cs_disable;
 549         }
 550
 551         error = input_register_device(in_dev);
 552         if (error) {
 553                 dev_err(&client->dev, "failed to register input device\n");
 554                 goto err_free_irq;
 555         }
 556
 557         device_init_wakeup(&client->dev, pdata->wakeup);
 558         i2c_set_clientdata(client, bu21013_data);
 559
 560         return 0;
 561
 562 err_free_irq:
 563         bu21013_free_irq(bu21013_data);
 564 err_cs_disable:
 565         bu21013_cs_disable(bu21013_data);
 566 err_disable_regulator:
 567         regulator_disable(bu21013_data->regulator);
 568 err_put_regulator:
 569         regulator_put(bu21013_data->regulator);
 570 err_free_mem:
 571         input_free_device(in_dev);
 572         kfree(bu21013_data);
 573
 574         return error;
 575 }
 576 /**
 577  * bu21013_remove() - removes the i2c-client touchscreen driver
 578  * @client: i2c client structure pointer
 579  *
 580  * This function uses to remove the i2c-client
 581  * touchscreen driver and returns integer.
 582  */
 583 static int bu21013_remove(struct i2c_client *client)
 584 {
 585         struct bu21013_ts_data *bu21013_data = i2c_get_clientdata(client);
 586
 587         bu21013_free_irq(bu21013_data);
 588
 589         bu21013_cs_disable(bu21013_data);
 590
 591         input_unregister_device(bu21013_data->in_dev);
 592
 593         regulator_disable(bu21013_data->regulator);
 594         regulator_put(bu21013_data->regulator);
 595
 596         kfree(bu21013_data);
 597
 598         device_init_wakeup(&client->dev, false);
 599
 600         return 0;
 601 }
 602
 603 #ifdef CONFIG_PM
 604 /**
 605  * bu21013_suspend() - suspend the touch screen controller
 606  * @dev: pointer to device structure
 607  *
 608  * This function is used to suspend the
 609  * touch panel controller and returns integer
 610  */
 611 static int bu21013_suspend(struct device *dev)
 612 {
 613         struct bu21013_ts_data *bu21013_data = dev_get_drvdata(dev);
 614         struct i2c_client *client = bu21013_data->client;
 615
 616         bu21013_data->touch_stopped = true;
 617         if (device_may_wakeup(&client->dev))
 618                 enable_irq_wake(bu21013_data->irq);
 619         else
 620                 disable_irq(bu21013_data->irq);
 621
 622         regulator_disable(bu21013_data->regulator);
 623
 624         return 0;
 625 }
 626
 627 /**
 628  * bu21013_resume() - resume the touch screen controller
 629  * @dev: pointer to device structure
 630  *
 631  * This function is used to resume the touch panel
 632  * controller and returns integer.
 633  */
 634 static int bu21013_resume(struct device *dev)
 635 {
 636         struct bu21013_ts_data *bu21013_data = dev_get_drvdata(dev);
 637         struct i2c_client *client = bu21013_data->client;
 638         int retval;
 639
 640         retval = regulator_enable(bu21013_data->regulator);
 641         if (retval < 0) {
 642                 dev_err(&client->dev, "bu21013 regulator enable failed\n");
 643                 return retval;
 644         }
 645
 646         retval = bu21013_init_chip(bu21013_data);
 647         if (retval < 0) {
 648                 dev_err(&client->dev, "bu21013 controller config failed\n");
 649                 return retval;
 650         }
 651
 652         bu21013_data->touch_stopped = false;
 653
 654         if (device_may_wakeup(&client->dev))
 655                 disable_irq_wake(bu21013_data->irq);
 656         else
 657                 enable_irq(bu21013_data->irq);
 658
 659         return 0;
 660 }
 661
 662 static const struct dev_pm_ops bu21013_dev_pm_ops = {
 663         .suspend = bu21013_suspend,
 664         .resume  = bu21013_resume,
 665 };
 666 #endif
 667
 668 static const struct i2c_device_id bu21013_id[] = {
 669         { DRIVER_TP, 0 },
 670         { }
 671 };
 672 MODULE_DEVICE_TABLE(i2c, bu21013_id);
 673
 674 static struct i2c_driver bu21013_driver = {
 675         .driver = {
 676                 .name   =       DRIVER_TP,
 677                 .owner  =       THIS_MODULE,
 678 #ifdef CONFIG_PM
 679                 .pm     =       &bu21013_dev_pm_ops,
 680 #endif
 681         },
 682         .probe          =       bu21013_probe,
 683         .remove         =       bu21013_remove,
 684         .id_table       =       bu21013_id,
 685 };
 686
 687 module_i2c_driver(bu21013_driver);
 688
 689 MODULE_LICENSE("GPL v2");
 690 MODULE_AUTHOR("Naveen Kumar G <naveen.gaddipati@stericsson.com>");
 691 MODULE_DESCRIPTION("bu21013 touch screen controller driver");