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 #include <linux/of.h>
  19 #include <linux/of_gpio.h>
  20
  21 #define PEN_DOWN_INTR   0
  22 #define MAX_FINGERS     2
  23 #define RESET_DELAY     30
  24 #define PENUP_TIMEOUT   (10)
  25 #define DELTA_MIN       16
  26 #define MASK_BITS       0x03
  27 #define SHIFT_8         8
  28 #define SHIFT_2         2
  29 #define LENGTH_OF_BUFFER        11
  30 #define I2C_RETRY_COUNT 5
  31
  32 #define BU21013_SENSORS_BTN_0_7_REG     0x70
  33 #define BU21013_SENSORS_BTN_8_15_REG    0x71
  34 #define BU21013_SENSORS_BTN_16_23_REG   0x72
  35 #define BU21013_X1_POS_MSB_REG          0x73
  36 #define BU21013_X1_POS_LSB_REG          0x74
  37 #define BU21013_Y1_POS_MSB_REG          0x75
  38 #define BU21013_Y1_POS_LSB_REG          0x76
  39 #define BU21013_X2_POS_MSB_REG          0x77
  40 #define BU21013_X2_POS_LSB_REG          0x78
  41 #define BU21013_Y2_POS_MSB_REG          0x79
  42 #define BU21013_Y2_POS_LSB_REG          0x7A
  43 #define BU21013_INT_CLR_REG             0xE8
  44 #define BU21013_INT_MODE_REG            0xE9
  45 #define BU21013_GAIN_REG                0xEA
  46 #define BU21013_OFFSET_MODE_REG         0xEB
  47 #define BU21013_XY_EDGE_REG             0xEC
  48 #define BU21013_RESET_REG               0xED
  49 #define BU21013_CALIB_REG               0xEE
  50 #define BU21013_DONE_REG                0xEF
  51 #define BU21013_SENSOR_0_7_REG          0xF0
  52 #define BU21013_SENSOR_8_15_REG         0xF1
  53 #define BU21013_SENSOR_16_23_REG        0xF2
  54 #define BU21013_POS_MODE1_REG           0xF3
  55 #define BU21013_POS_MODE2_REG           0xF4
  56 #define BU21013_CLK_MODE_REG            0xF5
  57 #define BU21013_IDLE_REG                0xFA
  58 #define BU21013_FILTER_REG              0xFB
  59 #define BU21013_TH_ON_REG               0xFC
  60 #define BU21013_TH_OFF_REG              0xFD
  61
  62
  63 #define BU21013_RESET_ENABLE            0x01
  64
  65 #define BU21013_SENSORS_EN_0_7          0x3F
  66 #define BU21013_SENSORS_EN_8_15         0xFC
  67 #define BU21013_SENSORS_EN_16_23        0x1F
  68
  69 #define BU21013_POS_MODE1_0             0x02
  70 #define BU21013_POS_MODE1_1             0x04
  71 #define BU21013_POS_MODE1_2             0x08
  72
  73 #define BU21013_POS_MODE2_ZERO          0x01
  74 #define BU21013_POS_MODE2_AVG1          0x02
  75 #define BU21013_POS_MODE2_AVG2          0x04
  76 #define BU21013_POS_MODE2_EN_XY         0x08
  77 #define BU21013_POS_MODE2_EN_RAW        0x10
  78 #define BU21013_POS_MODE2_MULTI         0x80
  79
  80 #define BU21013_CLK_MODE_DIV            0x01
  81 #define BU21013_CLK_MODE_EXT            0x02
  82 #define BU21013_CLK_MODE_CALIB          0x80
  83
  84 #define BU21013_IDLET_0                 0x01
  85 #define BU21013_IDLET_1                 0x02
  86 #define BU21013_IDLET_2                 0x04
  87 #define BU21013_IDLET_3                 0x08
  88 #define BU21013_IDLE_INTERMIT_EN        0x10
  89
  90 #define BU21013_DELTA_0_6       0x7F
  91 #define BU21013_FILTER_EN       0x80
  92
  93 #define BU21013_INT_MODE_LEVEL  0x00
  94 #define BU21013_INT_MODE_EDGE   0x01
  95
  96 #define BU21013_GAIN_0          0x01
  97 #define BU21013_GAIN_1          0x02
  98 #define BU21013_GAIN_2          0x04
  99
 100 #define BU21013_OFFSET_MODE_DEFAULT     0x00
 101 #define BU21013_OFFSET_MODE_MOVE        0x01
 102 #define BU21013_OFFSET_MODE_DISABLE     0x02
 103
 104 #define BU21013_TH_ON_0         0x01
 105 #define BU21013_TH_ON_1         0x02
 106 #define BU21013_TH_ON_2         0x04
 107 #define BU21013_TH_ON_3         0x08
 108 #define BU21013_TH_ON_4         0x10
 109 #define BU21013_TH_ON_5         0x20
 110 #define BU21013_TH_ON_6         0x40
 111 #define BU21013_TH_ON_7         0x80
 112 #define BU21013_TH_ON_MAX       0xFF
 113
 114 #define BU21013_TH_OFF_0        0x01
 115 #define BU21013_TH_OFF_1        0x02
 116 #define BU21013_TH_OFF_2        0x04
 117 #define BU21013_TH_OFF_3        0x08
 118 #define BU21013_TH_OFF_4        0x10
 119 #define BU21013_TH_OFF_5        0x20
 120 #define BU21013_TH_OFF_6        0x40
 121 #define BU21013_TH_OFF_7        0x80
 122 #define BU21013_TH_OFF_MAX      0xFF
 123
 124 #define BU21013_X_EDGE_0        0x01
 125 #define BU21013_X_EDGE_1        0x02
 126 #define BU21013_X_EDGE_2        0x04
 127 #define BU21013_X_EDGE_3        0x08
 128 #define BU21013_Y_EDGE_0        0x10
 129 #define BU21013_Y_EDGE_1        0x20
 130 #define BU21013_Y_EDGE_2        0x40
 131 #define BU21013_Y_EDGE_3        0x80
 132
 133 #define BU21013_DONE    0x01
 134 #define BU21013_NUMBER_OF_X_SENSORS     (6)
 135 #define BU21013_NUMBER_OF_Y_SENSORS     (11)
 136
 137 #define DRIVER_TP       "bu21013_tp"
 138
 139 /**
 140  * struct bu21013_ts_data - touch panel data structure
 141  * @client: pointer to the i2c client
 142  * @wait: variable to wait_queue_head_t structure
 143  * @touch_stopped: touch stop flag
 144  * @chip: pointer to the touch panel controller
 145  * @in_dev: pointer to the input device structure
 146  * @intr_pin: interrupt pin value
 147  * @regulator: pointer to the Regulator used for touch screen
 148  *
 149  * Touch panel device data structure
 150  */
 151 struct bu21013_ts_data {
 152         struct i2c_client *client;
 153         wait_queue_head_t wait;
 154         const struct bu21013_platform_device *chip;
 155         struct input_dev *in_dev;
 156         struct regulator *regulator;
 157         unsigned int irq;
 158         unsigned int intr_pin;
 159         bool touch_stopped;
 160 };
 161
 162 /**
 163  * bu21013_read_block_data(): read the touch co-ordinates
 164  * @data: bu21013_ts_data structure pointer
 165  * @buf: byte pointer
 166  *
 167  * Read the touch co-ordinates using i2c read block into buffer
 168  * and returns integer.
 169  */
 170 static int bu21013_read_block_data(struct bu21013_ts_data *data, u8 *buf)
 171 {
 172         int ret, i;
 173
 174         for (i = 0; i < I2C_RETRY_COUNT; i++) {
 175                 ret = i2c_smbus_read_i2c_block_data
 176                         (data->client, BU21013_SENSORS_BTN_0_7_REG,
 177                                 LENGTH_OF_BUFFER, buf);
 178                 if (ret == LENGTH_OF_BUFFER)
 179                         return 0;
 180         }
 181         return -EINVAL;
 182 }
 183
 184 /**
 185  * bu21013_do_touch_report(): Get the touch co-ordinates
 186  * @data: bu21013_ts_data structure pointer
 187  *
 188  * Get the touch co-ordinates from touch sensor registers and writes
 189  * into device structure and returns integer.
 190  */
 191 static int bu21013_do_touch_report(struct bu21013_ts_data *data)
 192 {
 193         u8      buf[LENGTH_OF_BUFFER];
 194         unsigned int pos_x[2], pos_y[2];
 195         bool    has_x_sensors, has_y_sensors;
 196         int     finger_down_count = 0;
 197         int     i;
 198
 199         if (data == NULL)
 200                 return -EINVAL;
 201
 202         if (bu21013_read_block_data(data, buf) < 0)
 203                 return -EINVAL;
 204
 205         has_x_sensors = hweight32(buf[0] & BU21013_SENSORS_EN_0_7);
 206         has_y_sensors = hweight32(((buf[1] & BU21013_SENSORS_EN_8_15) |
 207                 ((buf[2] & BU21013_SENSORS_EN_16_23) << SHIFT_8)) >> SHIFT_2);
 208         if (!has_x_sensors || !has_y_sensors)
 209                 return 0;
 210
 211         for (i = 0; i < MAX_FINGERS; i++) {
 212                 const u8 *p = &buf[4 * i + 3];
 213                 unsigned int x = p[0] << SHIFT_2 | (p[1] & MASK_BITS);
 214                 unsigned int y = p[2] << SHIFT_2 | (p[3] & MASK_BITS);
 215                 if (x == 0 || y == 0)
 216                         continue;
 217                 pos_x[finger_down_count] = x;
 218                 pos_y[finger_down_count] = y;
 219                 finger_down_count++;
 220         }
 221
 222         if (finger_down_count) {
 223                 if (finger_down_count == 2 &&
 224                     (abs(pos_x[0] - pos_x[1]) < DELTA_MIN ||
 225                      abs(pos_y[0] - pos_y[1]) < DELTA_MIN)) {
 226                         return 0;
 227                 }
 228
 229                 for (i = 0; i < finger_down_count; i++) {
 230                         if (data->chip->x_flip)
 231                                 pos_x[i] = data->chip->touch_x_max - pos_x[i];
 232                         if (data->chip->y_flip)
 233                                 pos_y[i] = data->chip->touch_y_max - pos_y[i];
 234
 235                         input_report_abs(data->in_dev,
 236                                          ABS_MT_POSITION_X, pos_x[i]);
 237                         input_report_abs(data->in_dev,
 238                                          ABS_MT_POSITION_Y, pos_y[i]);
 239                         input_mt_sync(data->in_dev);
 240                 }
 241         } else
 242                 input_mt_sync(data->in_dev);
 243
 244         input_sync(data->in_dev);
 245
 246         return 0;
 247 }
 248 /**
 249  * bu21013_gpio_irq() - gpio thread function for touch interrupt
 250  * @irq: irq value
 251  * @device_data: void pointer
 252  *
 253  * This gpio thread function for touch interrupt
 254  * and returns irqreturn_t.
 255  */
 256 static irqreturn_t bu21013_gpio_irq(int irq, void *device_data)
 257 {
 258         struct bu21013_ts_data *data = device_data;
 259         struct i2c_client *i2c = data->client;
 260         int retval;
 261
 262         do {
 263                 retval = bu21013_do_touch_report(data);
 264                 if (retval < 0) {
 265                         dev_err(&i2c->dev, "bu21013_do_touch_report failed\n");
 266                         return IRQ_NONE;
 267                 }
 268
 269                 data->intr_pin = gpio_get_value(data->chip->touch_pin);
 270                 if (data->intr_pin == PEN_DOWN_INTR)
 271                         wait_event_timeout(data->wait, data->touch_stopped,
 272                                            msecs_to_jiffies(2));
 273         } while (!data->intr_pin && !data->touch_stopped);
 274
 275         return IRQ_HANDLED;
 276 }
 277
 278 /**
 279  * bu21013_init_chip() - power on sequence for the bu21013 controller
 280  * @data: device structure pointer
 281  *
 282  * This function is used to power on
 283  * the bu21013 controller and returns integer.
 284  */
 285 static int bu21013_init_chip(struct bu21013_ts_data *data)
 286 {
 287         int retval;
 288         struct i2c_client *i2c = data->client;
 289
 290         retval = i2c_smbus_write_byte_data(i2c, BU21013_RESET_REG,
 291                                         BU21013_RESET_ENABLE);
 292         if (retval < 0) {
 293                 dev_err(&i2c->dev, "BU21013_RESET reg write failed\n");
 294                 return retval;
 295         }
 296         msleep(RESET_DELAY);
 297
 298         retval = i2c_smbus_write_byte_data(i2c, BU21013_SENSOR_0_7_REG,
 299                                         BU21013_SENSORS_EN_0_7);
 300         if (retval < 0) {
 301                 dev_err(&i2c->dev, "BU21013_SENSOR_0_7 reg write failed\n");
 302                 return retval;
 303         }
 304
 305         retval = i2c_smbus_write_byte_data(i2c, BU21013_SENSOR_8_15_REG,
 306                                                 BU21013_SENSORS_EN_8_15);
 307         if (retval < 0) {
 308                 dev_err(&i2c->dev, "BU21013_SENSOR_8_15 reg write failed\n");
 309                 return retval;
 310         }
 311
 312         retval = i2c_smbus_write_byte_data(i2c, BU21013_SENSOR_16_23_REG,
 313                                                 BU21013_SENSORS_EN_16_23);
 314         if (retval < 0) {
 315                 dev_err(&i2c->dev, "BU21013_SENSOR_16_23 reg write failed\n");
 316                 return retval;
 317         }
 318
 319         retval = i2c_smbus_write_byte_data(i2c, BU21013_POS_MODE1_REG,
 320                                 (BU21013_POS_MODE1_0 | BU21013_POS_MODE1_1));
 321         if (retval < 0) {
 322                 dev_err(&i2c->dev, "BU21013_POS_MODE1 reg write failed\n");
 323                 return retval;
 324         }
 325
 326         retval = i2c_smbus_write_byte_data(i2c, BU21013_POS_MODE2_REG,
 327                         (BU21013_POS_MODE2_ZERO | BU21013_POS_MODE2_AVG1 |
 328                         BU21013_POS_MODE2_AVG2 | BU21013_POS_MODE2_EN_RAW |
 329                         BU21013_POS_MODE2_MULTI));
 330         if (retval < 0) {
 331                 dev_err(&i2c->dev, "BU21013_POS_MODE2 reg write failed\n");
 332                 return retval;
 333         }
 334
 335         if (data->chip->ext_clk)
 336                 retval = i2c_smbus_write_byte_data(i2c, BU21013_CLK_MODE_REG,
 337                         (BU21013_CLK_MODE_EXT | BU21013_CLK_MODE_CALIB));
 338         else
 339                 retval = i2c_smbus_write_byte_data(i2c, BU21013_CLK_MODE_REG,
 340                         (BU21013_CLK_MODE_DIV | BU21013_CLK_MODE_CALIB));
 341         if (retval < 0) {
 342                 dev_err(&i2c->dev, "BU21013_CLK_MODE reg write failed\n");
 343                 return retval;
 344         }
 345
 346         retval = i2c_smbus_write_byte_data(i2c, BU21013_IDLE_REG,
 347                                 (BU21013_IDLET_0 | BU21013_IDLE_INTERMIT_EN));
 348         if (retval < 0) {
 349                 dev_err(&i2c->dev, "BU21013_IDLE reg write failed\n");
 350                 return retval;
 351         }
 352
 353         retval = i2c_smbus_write_byte_data(i2c, BU21013_INT_MODE_REG,
 354                                                 BU21013_INT_MODE_LEVEL);
 355         if (retval < 0) {
 356                 dev_err(&i2c->dev, "BU21013_INT_MODE reg write failed\n");
 357                 return retval;
 358         }
 359
 360         retval = i2c_smbus_write_byte_data(i2c, BU21013_FILTER_REG,
 361                                                 (BU21013_DELTA_0_6 |
 362                                                         BU21013_FILTER_EN));
 363         if (retval < 0) {
 364                 dev_err(&i2c->dev, "BU21013_FILTER reg write failed\n");
 365                 return retval;
 366         }
 367
 368         retval = i2c_smbus_write_byte_data(i2c, BU21013_TH_ON_REG,
 369                                         BU21013_TH_ON_5);
 370         if (retval < 0) {
 371                 dev_err(&i2c->dev, "BU21013_TH_ON reg write failed\n");
 372                 return retval;
 373         }
 374
 375         retval = i2c_smbus_write_byte_data(i2c, BU21013_TH_OFF_REG,
 376                                 BU21013_TH_OFF_4 | BU21013_TH_OFF_3);
 377         if (retval < 0) {
 378                 dev_err(&i2c->dev, "BU21013_TH_OFF reg write failed\n");
 379                 return retval;
 380         }
 381
 382         retval = i2c_smbus_write_byte_data(i2c, BU21013_GAIN_REG,
 383                                         (BU21013_GAIN_0 | BU21013_GAIN_1));
 384         if (retval < 0) {
 385                 dev_err(&i2c->dev, "BU21013_GAIN reg write failed\n");
 386                 return retval;
 387         }
 388
 389         retval = i2c_smbus_write_byte_data(i2c, BU21013_OFFSET_MODE_REG,
 390                                         BU21013_OFFSET_MODE_DEFAULT);
 391         if (retval < 0) {
 392                 dev_err(&i2c->dev, "BU21013_OFFSET_MODE reg write failed\n");
 393                 return retval;
 394         }
 395
 396         retval = i2c_smbus_write_byte_data(i2c, BU21013_XY_EDGE_REG,
 397                                 (BU21013_X_EDGE_0 | BU21013_X_EDGE_2 |
 398                                 BU21013_Y_EDGE_1 | BU21013_Y_EDGE_3));
 399         if (retval < 0) {
 400                 dev_err(&i2c->dev, "BU21013_XY_EDGE reg write failed\n");
 401                 return retval;
 402         }
 403
 404         retval = i2c_smbus_write_byte_data(i2c, BU21013_DONE_REG,
 405                                                         BU21013_DONE);
 406         if (retval < 0) {
 407                 dev_err(&i2c->dev, "BU21013_REG_DONE reg write failed\n");
 408                 return retval;
 409         }
 410
 411         return 0;
 412 }
 413
 414 /**
 415  * bu21013_free_irq() - frees IRQ registered for touchscreen
 416  * @bu21013_data: device structure pointer
 417  *
 418  * This function signals interrupt thread to stop processing and
 419  * frees interrupt.
 420  */
 421 static void bu21013_free_irq(struct bu21013_ts_data *bu21013_data)
 422 {
 423         bu21013_data->touch_stopped = true;
 424         wake_up(&bu21013_data->wait);
 425         free_irq(bu21013_data->irq, bu21013_data);
 426 }
 427
 428 /**
 429  * bu21013_cs_disable() - deconfigures the touch panel controller
 430  * @bu21013_data: device structure pointer
 431  *
 432  * This function is used to deconfigure the chip selection
 433  * for touch panel controller.
 434  */
 435 static void bu21013_cs_disable(struct bu21013_ts_data *bu21013_data)
 436 {
 437         int error;
 438
 439         error = gpio_direction_output(bu21013_data->chip->cs_pin, 0);
 440         if (error < 0)
 441                 dev_warn(&bu21013_data->client->dev,
 442                          "%s: gpio direction failed, error: %d\n",
 443                          __func__, error);
 444         else
 445                 gpio_set_value(bu21013_data->chip->cs_pin, 0);
 446
 447         gpio_free(bu21013_data->chip->cs_pin);
 448 }
 449
 450 #ifdef CONFIG_OF
 451 static const struct bu21013_platform_device *
 452 bu21013_parse_dt(struct device *dev)
 453 {
 454         struct device_node *np = dev->of_node;
 455         struct bu21013_platform_device *pdata;
 456
 457         if (!np) {
 458                 dev_err(dev, "no device tree or platform data\n");
 459                 return ERR_PTR(-EINVAL);
 460         }
 461
 462         pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
 463         if (!pdata)
 464                 return ERR_PTR(-ENOMEM);
 465
 466         pdata->y_flip = pdata->x_flip = false;
 467
 468         pdata->x_flip = of_property_read_bool(np, "rohm,flip-x");
 469         pdata->y_flip = of_property_read_bool(np, "rohm,flip-y");
 470
 471         of_property_read_u32(np, "rohm,touch-max-x", &pdata->touch_x_max);
 472         of_property_read_u32(np, "rohm,touch-max-y", &pdata->touch_y_max);
 473
 474         pdata->touch_pin = of_get_named_gpio(np, "touch-gpio", 0);
 475         pdata->cs_pin = of_get_named_gpio(np, "reset-gpio", 0);
 476
 477         pdata->ext_clk = false;
 478
 479         return pdata;
 480 }
 481 #else
 482 static inline const struct bu21013_platform_device *
 483 bu21013_parse_dt(struct device *dev)
 484 {
 485         dev_err(dev, "no platform data available\n");
 486         return ERR_PTR(-EINVAL);
 487 }
 488 #endif
 489
 490 /**
 491  * bu21013_probe() - initializes the i2c-client touchscreen driver
 492  * @client: i2c client structure pointer
 493  * @id: i2c device id pointer
 494  *
 495  * This function used to initializes the i2c-client touchscreen
 496  * driver and returns integer.
 497  */
 498 static int bu21013_probe(struct i2c_client *client,
 499                          const struct i2c_device_id *id)
 500 {
 501         const struct bu21013_platform_device *pdata =
 502                                         dev_get_platdata(&client->dev);
 503         struct bu21013_ts_data *bu21013_data;
 504         struct input_dev *in_dev;
 505         int error;
 506
 507         if (!i2c_check_functionality(client->adapter,
 508                                         I2C_FUNC_SMBUS_BYTE_DATA)) {
 509                 dev_err(&client->dev, "i2c smbus byte data not supported\n");
 510                 return -EIO;
 511         }
 512
 513         if (!pdata) {
 514                 pdata = bu21013_parse_dt(&client->dev);
 515                 if (IS_ERR(pdata))
 516                         return PTR_ERR(pdata);
 517         }
 518
 519         if (!gpio_is_valid(pdata->touch_pin)) {
 520                 dev_err(&client->dev, "invalid touch_pin supplied\n");
 521                 return -EINVAL;
 522         }
 523
 524         bu21013_data = kzalloc(sizeof(struct bu21013_ts_data), GFP_KERNEL);
 525         in_dev = input_allocate_device();
 526         if (!bu21013_data || !in_dev) {
 527                 dev_err(&client->dev, "device memory alloc failed\n");
 528                 error = -ENOMEM;
 529                 goto err_free_mem;
 530         }
 531
 532         bu21013_data->in_dev = in_dev;
 533         bu21013_data->chip = pdata;
 534         bu21013_data->client = client;
 535         bu21013_data->irq = gpio_to_irq(pdata->touch_pin);
 536
 537         bu21013_data->regulator = regulator_get(&client->dev, "avdd");
 538         if (IS_ERR(bu21013_data->regulator)) {
 539                 dev_err(&client->dev, "regulator_get failed\n");
 540                 error = PTR_ERR(bu21013_data->regulator);
 541                 goto err_free_mem;
 542         }
 543
 544         error = regulator_enable(bu21013_data->regulator);
 545         if (error < 0) {
 546                 dev_err(&client->dev, "regulator enable failed\n");
 547                 goto err_put_regulator;
 548         }
 549
 550         bu21013_data->touch_stopped = false;
 551         init_waitqueue_head(&bu21013_data->wait);
 552
 553         /* configure the gpio pins */
 554         error = gpio_request_one(pdata->cs_pin, GPIOF_OUT_INIT_HIGH,
 555                                  "touchp_reset");
 556         if (error < 0) {
 557                 dev_err(&client->dev, "Unable to request gpio reset_pin\n");
 558                 goto err_disable_regulator;
 559         }
 560
 561         /* configure the touch panel controller */
 562         error = bu21013_init_chip(bu21013_data);
 563         if (error) {
 564                 dev_err(&client->dev, "error in bu21013 config\n");
 565                 goto err_cs_disable;
 566         }
 567
 568         /* register the device to input subsystem */
 569         in_dev->name = DRIVER_TP;
 570         in_dev->id.bustype = BUS_I2C;
 571         in_dev->dev.parent = &client->dev;
 572
 573         __set_bit(EV_SYN, in_dev->evbit);
 574         __set_bit(EV_KEY, in_dev->evbit);
 575         __set_bit(EV_ABS, in_dev->evbit);
 576
 577         input_set_abs_params(in_dev, ABS_MT_POSITION_X, 0,
 578                                                 pdata->touch_x_max, 0, 0);
 579         input_set_abs_params(in_dev, ABS_MT_POSITION_Y, 0,
 580                                                 pdata->touch_y_max, 0, 0);
 581         input_set_drvdata(in_dev, bu21013_data);
 582
 583         error = request_threaded_irq(bu21013_data->irq, NULL, bu21013_gpio_irq,
 584                                      IRQF_TRIGGER_FALLING | IRQF_SHARED |
 585                                         IRQF_ONESHOT,
 586                                      DRIVER_TP, bu21013_data);
 587         if (error) {
 588                 dev_err(&client->dev, "request irq %d failed\n",
 589                         bu21013_data->irq);
 590                 goto err_cs_disable;
 591         }
 592
 593         error = input_register_device(in_dev);
 594         if (error) {
 595                 dev_err(&client->dev, "failed to register input device\n");
 596                 goto err_free_irq;
 597         }
 598
 599         device_init_wakeup(&client->dev, pdata->wakeup);
 600         i2c_set_clientdata(client, bu21013_data);
 601
 602         return 0;
 603
 604 err_free_irq:
 605         bu21013_free_irq(bu21013_data);
 606 err_cs_disable:
 607         bu21013_cs_disable(bu21013_data);
 608 err_disable_regulator:
 609         regulator_disable(bu21013_data->regulator);
 610 err_put_regulator:
 611         regulator_put(bu21013_data->regulator);
 612 err_free_mem:
 613         input_free_device(in_dev);
 614         kfree(bu21013_data);
 615
 616         return error;
 617 }
 618 /**
 619  * bu21013_remove() - removes the i2c-client touchscreen driver
 620  * @client: i2c client structure pointer
 621  *
 622  * This function uses to remove the i2c-client
 623  * touchscreen driver and returns integer.
 624  */
 625 static int bu21013_remove(struct i2c_client *client)
 626 {
 627         struct bu21013_ts_data *bu21013_data = i2c_get_clientdata(client);
 628
 629         bu21013_free_irq(bu21013_data);
 630
 631         bu21013_cs_disable(bu21013_data);
 632
 633         input_unregister_device(bu21013_data->in_dev);
 634
 635         regulator_disable(bu21013_data->regulator);
 636         regulator_put(bu21013_data->regulator);
 637
 638         kfree(bu21013_data);
 639
 640         return 0;
 641 }
 642
 643 #ifdef CONFIG_PM
 644 /**
 645  * bu21013_suspend() - suspend the touch screen controller
 646  * @dev: pointer to device structure
 647  *
 648  * This function is used to suspend the
 649  * touch panel controller and returns integer
 650  */
 651 static int bu21013_suspend(struct device *dev)
 652 {
 653         struct bu21013_ts_data *bu21013_data = dev_get_drvdata(dev);
 654         struct i2c_client *client = bu21013_data->client;
 655
 656         bu21013_data->touch_stopped = true;
 657         if (device_may_wakeup(&client->dev))
 658                 enable_irq_wake(bu21013_data->irq);
 659         else
 660                 disable_irq(bu21013_data->irq);
 661
 662         regulator_disable(bu21013_data->regulator);
 663
 664         return 0;
 665 }
 666
 667 /**
 668  * bu21013_resume() - resume the touch screen controller
 669  * @dev: pointer to device structure
 670  *
 671  * This function is used to resume the touch panel
 672  * controller and returns integer.
 673  */
 674 static int bu21013_resume(struct device *dev)
 675 {
 676         struct bu21013_ts_data *bu21013_data = dev_get_drvdata(dev);
 677         struct i2c_client *client = bu21013_data->client;
 678         int retval;
 679
 680         retval = regulator_enable(bu21013_data->regulator);
 681         if (retval < 0) {
 682                 dev_err(&client->dev, "bu21013 regulator enable failed\n");
 683                 return retval;
 684         }
 685
 686         retval = bu21013_init_chip(bu21013_data);
 687         if (retval < 0) {
 688                 dev_err(&client->dev, "bu21013 controller config failed\n");
 689                 return retval;
 690         }
 691
 692         bu21013_data->touch_stopped = false;
 693
 694         if (device_may_wakeup(&client->dev))
 695                 disable_irq_wake(bu21013_data->irq);
 696         else
 697                 enable_irq(bu21013_data->irq);
 698
 699         return 0;
 700 }
 701
 702 static const struct dev_pm_ops bu21013_dev_pm_ops = {
 703         .suspend = bu21013_suspend,
 704         .resume  = bu21013_resume,
 705 };
 706 #endif
 707
 708 static const struct i2c_device_id bu21013_id[] = {
 709         { DRIVER_TP, 0 },
 710         { }
 711 };
 712 MODULE_DEVICE_TABLE(i2c, bu21013_id);
 713
 714 static struct i2c_driver bu21013_driver = {
 715         .driver = {
 716                 .name   =       DRIVER_TP,
 717 #ifdef CONFIG_PM
 718                 .pm     =       &bu21013_dev_pm_ops,
 719 #endif
 720         },
 721         .probe          =       bu21013_probe,
 722         .remove         =       bu21013_remove,
 723         .id_table       =       bu21013_id,
 724 };
 725
 726 module_i2c_driver(bu21013_driver);
 727
 728 MODULE_LICENSE("GPL v2");
 729 MODULE_AUTHOR("Naveen Kumar G <naveen.gaddipati@stericsson.com>");
 730 MODULE_DESCRIPTION("bu21013 touch screen controller driver");