linux/drivers/input/touchscreen/bu21013_ts.c
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   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * Copyright (C) ST-Ericsson SA 2010
   4 * Author: Naveen Kumar G <naveen.gaddipati@stericsson.com> for ST-Ericsson
   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 */
 151struct 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 */
 170static 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 */
 191static 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 */
 256static 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 */
 285static 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 */
 421static 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 */
 435static 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
 451static const struct bu21013_platform_device *
 452bu21013_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
 482static inline const struct bu21013_platform_device *
 483bu21013_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 */
 498static 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
 604err_free_irq:
 605        bu21013_free_irq(bu21013_data);
 606err_cs_disable:
 607        bu21013_cs_disable(bu21013_data);
 608err_disable_regulator:
 609        regulator_disable(bu21013_data->regulator);
 610err_put_regulator:
 611        regulator_put(bu21013_data->regulator);
 612err_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 */
 625static 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 */
 651static 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 */
 674static 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
 702static const struct dev_pm_ops bu21013_dev_pm_ops = {
 703        .suspend = bu21013_suspend,
 704        .resume  = bu21013_resume,
 705};
 706#endif
 707
 708static const struct i2c_device_id bu21013_id[] = {
 709        { DRIVER_TP, 0 },
 710        { }
 711};
 712MODULE_DEVICE_TABLE(i2c, bu21013_id);
 713
 714static 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
 726module_i2c_driver(bu21013_driver);
 727
 728MODULE_LICENSE("GPL v2");
 729MODULE_AUTHOR("Naveen Kumar G <naveen.gaddipati@stericsson.com>");
 730MODULE_DESCRIPTION("bu21013 touch screen controller driver");
 731