Naveen Kumar Gaddipati | 4780c8d | 2010-10-04 22:32:48 -0700 | [diff] [blame] | 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> |
Naveen Kumar Gaddipati | 81e78de | 2011-01-17 20:47:31 -0800 | [diff] [blame] | 15 | #include <linux/regulator/consumer.h> |
Naveen Kumar Gaddipati | 4780c8d | 2010-10-04 22:32:48 -0700 | [diff] [blame] | 16 | |
| 17 | #define PEN_DOWN_INTR 0 |
| 18 | #define MAX_FINGERS 2 |
| 19 | #define RESET_DELAY 30 |
| 20 | #define PENUP_TIMEOUT (10) |
| 21 | #define DELTA_MIN 16 |
| 22 | #define MASK_BITS 0x03 |
| 23 | #define SHIFT_8 8 |
| 24 | #define SHIFT_2 2 |
| 25 | #define LENGTH_OF_BUFFER 11 |
| 26 | #define I2C_RETRY_COUNT 5 |
| 27 | |
| 28 | #define BU21013_SENSORS_BTN_0_7_REG 0x70 |
| 29 | #define BU21013_SENSORS_BTN_8_15_REG 0x71 |
| 30 | #define BU21013_SENSORS_BTN_16_23_REG 0x72 |
| 31 | #define BU21013_X1_POS_MSB_REG 0x73 |
| 32 | #define BU21013_X1_POS_LSB_REG 0x74 |
| 33 | #define BU21013_Y1_POS_MSB_REG 0x75 |
| 34 | #define BU21013_Y1_POS_LSB_REG 0x76 |
| 35 | #define BU21013_X2_POS_MSB_REG 0x77 |
| 36 | #define BU21013_X2_POS_LSB_REG 0x78 |
| 37 | #define BU21013_Y2_POS_MSB_REG 0x79 |
| 38 | #define BU21013_Y2_POS_LSB_REG 0x7A |
| 39 | #define BU21013_INT_CLR_REG 0xE8 |
| 40 | #define BU21013_INT_MODE_REG 0xE9 |
| 41 | #define BU21013_GAIN_REG 0xEA |
| 42 | #define BU21013_OFFSET_MODE_REG 0xEB |
| 43 | #define BU21013_XY_EDGE_REG 0xEC |
| 44 | #define BU21013_RESET_REG 0xED |
| 45 | #define BU21013_CALIB_REG 0xEE |
| 46 | #define BU21013_DONE_REG 0xEF |
| 47 | #define BU21013_SENSOR_0_7_REG 0xF0 |
| 48 | #define BU21013_SENSOR_8_15_REG 0xF1 |
| 49 | #define BU21013_SENSOR_16_23_REG 0xF2 |
| 50 | #define BU21013_POS_MODE1_REG 0xF3 |
| 51 | #define BU21013_POS_MODE2_REG 0xF4 |
| 52 | #define BU21013_CLK_MODE_REG 0xF5 |
| 53 | #define BU21013_IDLE_REG 0xFA |
| 54 | #define BU21013_FILTER_REG 0xFB |
| 55 | #define BU21013_TH_ON_REG 0xFC |
| 56 | #define BU21013_TH_OFF_REG 0xFD |
| 57 | |
| 58 | |
| 59 | #define BU21013_RESET_ENABLE 0x01 |
| 60 | |
| 61 | #define BU21013_SENSORS_EN_0_7 0x3F |
| 62 | #define BU21013_SENSORS_EN_8_15 0xFC |
| 63 | #define BU21013_SENSORS_EN_16_23 0x1F |
| 64 | |
| 65 | #define BU21013_POS_MODE1_0 0x02 |
| 66 | #define BU21013_POS_MODE1_1 0x04 |
| 67 | #define BU21013_POS_MODE1_2 0x08 |
| 68 | |
| 69 | #define BU21013_POS_MODE2_ZERO 0x01 |
| 70 | #define BU21013_POS_MODE2_AVG1 0x02 |
| 71 | #define BU21013_POS_MODE2_AVG2 0x04 |
| 72 | #define BU21013_POS_MODE2_EN_XY 0x08 |
| 73 | #define BU21013_POS_MODE2_EN_RAW 0x10 |
| 74 | #define BU21013_POS_MODE2_MULTI 0x80 |
| 75 | |
| 76 | #define BU21013_CLK_MODE_DIV 0x01 |
| 77 | #define BU21013_CLK_MODE_EXT 0x02 |
| 78 | #define BU21013_CLK_MODE_CALIB 0x80 |
| 79 | |
| 80 | #define BU21013_IDLET_0 0x01 |
| 81 | #define BU21013_IDLET_1 0x02 |
| 82 | #define BU21013_IDLET_2 0x04 |
| 83 | #define BU21013_IDLET_3 0x08 |
| 84 | #define BU21013_IDLE_INTERMIT_EN 0x10 |
| 85 | |
| 86 | #define BU21013_DELTA_0_6 0x7F |
| 87 | #define BU21013_FILTER_EN 0x80 |
| 88 | |
| 89 | #define BU21013_INT_MODE_LEVEL 0x00 |
| 90 | #define BU21013_INT_MODE_EDGE 0x01 |
| 91 | |
| 92 | #define BU21013_GAIN_0 0x01 |
| 93 | #define BU21013_GAIN_1 0x02 |
| 94 | #define BU21013_GAIN_2 0x04 |
| 95 | |
| 96 | #define BU21013_OFFSET_MODE_DEFAULT 0x00 |
| 97 | #define BU21013_OFFSET_MODE_MOVE 0x01 |
| 98 | #define BU21013_OFFSET_MODE_DISABLE 0x02 |
| 99 | |
| 100 | #define BU21013_TH_ON_0 0x01 |
| 101 | #define BU21013_TH_ON_1 0x02 |
| 102 | #define BU21013_TH_ON_2 0x04 |
| 103 | #define BU21013_TH_ON_3 0x08 |
| 104 | #define BU21013_TH_ON_4 0x10 |
| 105 | #define BU21013_TH_ON_5 0x20 |
| 106 | #define BU21013_TH_ON_6 0x40 |
| 107 | #define BU21013_TH_ON_7 0x80 |
| 108 | #define BU21013_TH_ON_MAX 0xFF |
| 109 | |
| 110 | #define BU21013_TH_OFF_0 0x01 |
| 111 | #define BU21013_TH_OFF_1 0x02 |
| 112 | #define BU21013_TH_OFF_2 0x04 |
| 113 | #define BU21013_TH_OFF_3 0x08 |
| 114 | #define BU21013_TH_OFF_4 0x10 |
| 115 | #define BU21013_TH_OFF_5 0x20 |
| 116 | #define BU21013_TH_OFF_6 0x40 |
| 117 | #define BU21013_TH_OFF_7 0x80 |
| 118 | #define BU21013_TH_OFF_MAX 0xFF |
| 119 | |
| 120 | #define BU21013_X_EDGE_0 0x01 |
| 121 | #define BU21013_X_EDGE_1 0x02 |
| 122 | #define BU21013_X_EDGE_2 0x04 |
| 123 | #define BU21013_X_EDGE_3 0x08 |
| 124 | #define BU21013_Y_EDGE_0 0x10 |
| 125 | #define BU21013_Y_EDGE_1 0x20 |
| 126 | #define BU21013_Y_EDGE_2 0x40 |
| 127 | #define BU21013_Y_EDGE_3 0x80 |
| 128 | |
| 129 | #define BU21013_DONE 0x01 |
| 130 | #define BU21013_NUMBER_OF_X_SENSORS (6) |
| 131 | #define BU21013_NUMBER_OF_Y_SENSORS (11) |
| 132 | |
| 133 | #define DRIVER_TP "bu21013_tp" |
| 134 | |
| 135 | /** |
| 136 | * struct bu21013_ts_data - touch panel data structure |
| 137 | * @client: pointer to the i2c client |
| 138 | * @wait: variable to wait_queue_head_t structure |
| 139 | * @touch_stopped: touch stop flag |
| 140 | * @chip: pointer to the touch panel controller |
| 141 | * @in_dev: pointer to the input device structure |
| 142 | * @intr_pin: interrupt pin value |
Naveen Kumar Gaddipati | 81e78de | 2011-01-17 20:47:31 -0800 | [diff] [blame] | 143 | * @regulator: pointer to the Regulator used for touch screen |
Naveen Kumar Gaddipati | 4780c8d | 2010-10-04 22:32:48 -0700 | [diff] [blame] | 144 | * |
| 145 | * Touch panel device data structure |
| 146 | */ |
| 147 | struct bu21013_ts_data { |
| 148 | struct i2c_client *client; |
| 149 | wait_queue_head_t wait; |
| 150 | bool touch_stopped; |
| 151 | const struct bu21013_platform_device *chip; |
| 152 | struct input_dev *in_dev; |
| 153 | unsigned int intr_pin; |
Naveen Kumar Gaddipati | 81e78de | 2011-01-17 20:47:31 -0800 | [diff] [blame] | 154 | struct regulator *regulator; |
Naveen Kumar Gaddipati | 4780c8d | 2010-10-04 22:32:48 -0700 | [diff] [blame] | 155 | }; |
| 156 | |
| 157 | /** |
| 158 | * bu21013_read_block_data(): read the touch co-ordinates |
| 159 | * @data: bu21013_ts_data structure pointer |
| 160 | * @buf: byte pointer |
| 161 | * |
| 162 | * Read the touch co-ordinates using i2c read block into buffer |
| 163 | * and returns integer. |
| 164 | */ |
| 165 | static int bu21013_read_block_data(struct bu21013_ts_data *data, u8 *buf) |
| 166 | { |
| 167 | int ret, i; |
| 168 | |
| 169 | for (i = 0; i < I2C_RETRY_COUNT; i++) { |
| 170 | ret = i2c_smbus_read_i2c_block_data |
| 171 | (data->client, BU21013_SENSORS_BTN_0_7_REG, |
| 172 | LENGTH_OF_BUFFER, buf); |
| 173 | if (ret == LENGTH_OF_BUFFER) |
| 174 | return 0; |
| 175 | } |
| 176 | return -EINVAL; |
| 177 | } |
| 178 | |
| 179 | /** |
| 180 | * bu21013_do_touch_report(): Get the touch co-ordinates |
| 181 | * @data: bu21013_ts_data structure pointer |
| 182 | * |
| 183 | * Get the touch co-ordinates from touch sensor registers and writes |
| 184 | * into device structure and returns integer. |
| 185 | */ |
| 186 | static int bu21013_do_touch_report(struct bu21013_ts_data *data) |
| 187 | { |
| 188 | u8 buf[LENGTH_OF_BUFFER]; |
| 189 | unsigned int pos_x[2], pos_y[2]; |
| 190 | bool has_x_sensors, has_y_sensors; |
| 191 | int finger_down_count = 0; |
| 192 | int i; |
| 193 | |
| 194 | if (data == NULL) |
| 195 | return -EINVAL; |
| 196 | |
| 197 | if (bu21013_read_block_data(data, buf) < 0) |
| 198 | return -EINVAL; |
| 199 | |
| 200 | has_x_sensors = hweight32(buf[0] & BU21013_SENSORS_EN_0_7); |
| 201 | has_y_sensors = hweight32(((buf[1] & BU21013_SENSORS_EN_8_15) | |
| 202 | ((buf[2] & BU21013_SENSORS_EN_16_23) << SHIFT_8)) >> SHIFT_2); |
| 203 | if (!has_x_sensors || !has_y_sensors) |
| 204 | return 0; |
| 205 | |
| 206 | for (i = 0; i < MAX_FINGERS; i++) { |
| 207 | const u8 *p = &buf[4 * i + 3]; |
| 208 | unsigned int x = p[0] << SHIFT_2 | (p[1] & MASK_BITS); |
| 209 | unsigned int y = p[2] << SHIFT_2 | (p[3] & MASK_BITS); |
| 210 | if (x == 0 || y == 0) |
| 211 | continue; |
| 212 | pos_x[finger_down_count] = x; |
| 213 | pos_y[finger_down_count] = y; |
| 214 | finger_down_count++; |
| 215 | } |
| 216 | |
| 217 | if (finger_down_count) { |
| 218 | if (finger_down_count == 2 && |
| 219 | (abs(pos_x[0] - pos_x[1]) < DELTA_MIN || |
| 220 | abs(pos_y[0] - pos_y[1]) < DELTA_MIN)) { |
| 221 | return 0; |
| 222 | } |
| 223 | |
| 224 | for (i = 0; i < finger_down_count; i++) { |
| 225 | if (data->chip->x_flip) |
| 226 | pos_x[i] = data->chip->touch_x_max - pos_x[i]; |
| 227 | if (data->chip->y_flip) |
| 228 | pos_y[i] = data->chip->touch_y_max - pos_y[i]; |
| 229 | |
| 230 | input_report_abs(data->in_dev, |
| 231 | ABS_MT_POSITION_X, pos_x[i]); |
| 232 | input_report_abs(data->in_dev, |
| 233 | ABS_MT_POSITION_Y, pos_y[i]); |
| 234 | input_mt_sync(data->in_dev); |
| 235 | } |
| 236 | } else |
| 237 | input_mt_sync(data->in_dev); |
| 238 | |
| 239 | input_sync(data->in_dev); |
| 240 | |
| 241 | return 0; |
| 242 | } |
| 243 | /** |
| 244 | * bu21013_gpio_irq() - gpio thread function for touch interrupt |
| 245 | * @irq: irq value |
| 246 | * @device_data: void pointer |
| 247 | * |
| 248 | * This gpio thread function for touch interrupt |
| 249 | * and returns irqreturn_t. |
| 250 | */ |
| 251 | static irqreturn_t bu21013_gpio_irq(int irq, void *device_data) |
| 252 | { |
| 253 | struct bu21013_ts_data *data = device_data; |
| 254 | struct i2c_client *i2c = data->client; |
| 255 | int retval; |
| 256 | |
| 257 | do { |
| 258 | retval = bu21013_do_touch_report(data); |
| 259 | if (retval < 0) { |
| 260 | dev_err(&i2c->dev, "bu21013_do_touch_report failed\n"); |
| 261 | return IRQ_NONE; |
| 262 | } |
| 263 | |
| 264 | data->intr_pin = data->chip->irq_read_val(); |
| 265 | if (data->intr_pin == PEN_DOWN_INTR) |
| 266 | wait_event_timeout(data->wait, data->touch_stopped, |
| 267 | msecs_to_jiffies(2)); |
| 268 | } while (!data->intr_pin && !data->touch_stopped); |
| 269 | |
| 270 | return IRQ_HANDLED; |
| 271 | } |
| 272 | |
| 273 | /** |
| 274 | * bu21013_init_chip() - power on sequence for the bu21013 controller |
| 275 | * @data: device structure pointer |
| 276 | * |
| 277 | * This function is used to power on |
| 278 | * the bu21013 controller and returns integer. |
| 279 | */ |
| 280 | static int bu21013_init_chip(struct bu21013_ts_data *data) |
| 281 | { |
| 282 | int retval; |
| 283 | struct i2c_client *i2c = data->client; |
| 284 | |
| 285 | retval = i2c_smbus_write_byte_data(i2c, BU21013_RESET_REG, |
| 286 | BU21013_RESET_ENABLE); |
| 287 | if (retval < 0) { |
| 288 | dev_err(&i2c->dev, "BU21013_RESET reg write failed\n"); |
| 289 | return retval; |
| 290 | } |
| 291 | msleep(RESET_DELAY); |
| 292 | |
| 293 | retval = i2c_smbus_write_byte_data(i2c, BU21013_SENSOR_0_7_REG, |
| 294 | BU21013_SENSORS_EN_0_7); |
| 295 | if (retval < 0) { |
| 296 | dev_err(&i2c->dev, "BU21013_SENSOR_0_7 reg write failed\n"); |
| 297 | return retval; |
| 298 | } |
| 299 | |
| 300 | retval = i2c_smbus_write_byte_data(i2c, BU21013_SENSOR_8_15_REG, |
| 301 | BU21013_SENSORS_EN_8_15); |
| 302 | if (retval < 0) { |
| 303 | dev_err(&i2c->dev, "BU21013_SENSOR_8_15 reg write failed\n"); |
| 304 | return retval; |
| 305 | } |
| 306 | |
| 307 | retval = i2c_smbus_write_byte_data(i2c, BU21013_SENSOR_16_23_REG, |
| 308 | BU21013_SENSORS_EN_16_23); |
| 309 | if (retval < 0) { |
| 310 | dev_err(&i2c->dev, "BU21013_SENSOR_16_23 reg write failed\n"); |
| 311 | return retval; |
| 312 | } |
| 313 | |
| 314 | retval = i2c_smbus_write_byte_data(i2c, BU21013_POS_MODE1_REG, |
| 315 | (BU21013_POS_MODE1_0 | BU21013_POS_MODE1_1)); |
| 316 | if (retval < 0) { |
| 317 | dev_err(&i2c->dev, "BU21013_POS_MODE1 reg write failed\n"); |
| 318 | return retval; |
| 319 | } |
| 320 | |
| 321 | retval = i2c_smbus_write_byte_data(i2c, BU21013_POS_MODE2_REG, |
| 322 | (BU21013_POS_MODE2_ZERO | BU21013_POS_MODE2_AVG1 | |
| 323 | BU21013_POS_MODE2_AVG2 | BU21013_POS_MODE2_EN_RAW | |
| 324 | BU21013_POS_MODE2_MULTI)); |
| 325 | if (retval < 0) { |
| 326 | dev_err(&i2c->dev, "BU21013_POS_MODE2 reg write failed\n"); |
| 327 | return retval; |
| 328 | } |
| 329 | |
| 330 | if (data->chip->ext_clk) |
| 331 | retval = i2c_smbus_write_byte_data(i2c, BU21013_CLK_MODE_REG, |
| 332 | (BU21013_CLK_MODE_EXT | BU21013_CLK_MODE_CALIB)); |
| 333 | else |
| 334 | retval = i2c_smbus_write_byte_data(i2c, BU21013_CLK_MODE_REG, |
| 335 | (BU21013_CLK_MODE_DIV | BU21013_CLK_MODE_CALIB)); |
| 336 | if (retval < 0) { |
| 337 | dev_err(&i2c->dev, "BU21013_CLK_MODE reg write failed\n"); |
| 338 | return retval; |
| 339 | } |
| 340 | |
| 341 | retval = i2c_smbus_write_byte_data(i2c, BU21013_IDLE_REG, |
| 342 | (BU21013_IDLET_0 | BU21013_IDLE_INTERMIT_EN)); |
| 343 | if (retval < 0) { |
| 344 | dev_err(&i2c->dev, "BU21013_IDLE reg write failed\n"); |
| 345 | return retval; |
| 346 | } |
| 347 | |
| 348 | retval = i2c_smbus_write_byte_data(i2c, BU21013_INT_MODE_REG, |
| 349 | BU21013_INT_MODE_LEVEL); |
| 350 | if (retval < 0) { |
| 351 | dev_err(&i2c->dev, "BU21013_INT_MODE reg write failed\n"); |
| 352 | return retval; |
| 353 | } |
| 354 | |
| 355 | retval = i2c_smbus_write_byte_data(i2c, BU21013_FILTER_REG, |
| 356 | (BU21013_DELTA_0_6 | |
| 357 | BU21013_FILTER_EN)); |
| 358 | if (retval < 0) { |
| 359 | dev_err(&i2c->dev, "BU21013_FILTER reg write failed\n"); |
| 360 | return retval; |
| 361 | } |
| 362 | |
| 363 | retval = i2c_smbus_write_byte_data(i2c, BU21013_TH_ON_REG, |
| 364 | BU21013_TH_ON_5); |
| 365 | if (retval < 0) { |
| 366 | dev_err(&i2c->dev, "BU21013_TH_ON reg write failed\n"); |
| 367 | return retval; |
| 368 | } |
| 369 | |
| 370 | retval = i2c_smbus_write_byte_data(i2c, BU21013_TH_OFF_REG, |
David Sterba | ef11e70 | 2010-12-27 17:20:01 -0800 | [diff] [blame] | 371 | BU21013_TH_OFF_4 | BU21013_TH_OFF_3); |
Naveen Kumar Gaddipati | 4780c8d | 2010-10-04 22:32:48 -0700 | [diff] [blame] | 372 | if (retval < 0) { |
| 373 | dev_err(&i2c->dev, "BU21013_TH_OFF reg write failed\n"); |
| 374 | return retval; |
| 375 | } |
| 376 | |
| 377 | retval = i2c_smbus_write_byte_data(i2c, BU21013_GAIN_REG, |
| 378 | (BU21013_GAIN_0 | BU21013_GAIN_1)); |
| 379 | if (retval < 0) { |
| 380 | dev_err(&i2c->dev, "BU21013_GAIN reg write failed\n"); |
| 381 | return retval; |
| 382 | } |
| 383 | |
| 384 | retval = i2c_smbus_write_byte_data(i2c, BU21013_OFFSET_MODE_REG, |
| 385 | BU21013_OFFSET_MODE_DEFAULT); |
| 386 | if (retval < 0) { |
| 387 | dev_err(&i2c->dev, "BU21013_OFFSET_MODE reg write failed\n"); |
| 388 | return retval; |
| 389 | } |
| 390 | |
| 391 | retval = i2c_smbus_write_byte_data(i2c, BU21013_XY_EDGE_REG, |
| 392 | (BU21013_X_EDGE_0 | BU21013_X_EDGE_2 | |
| 393 | BU21013_Y_EDGE_1 | BU21013_Y_EDGE_3)); |
| 394 | if (retval < 0) { |
| 395 | dev_err(&i2c->dev, "BU21013_XY_EDGE reg write failed\n"); |
| 396 | return retval; |
| 397 | } |
| 398 | |
| 399 | retval = i2c_smbus_write_byte_data(i2c, BU21013_DONE_REG, |
| 400 | BU21013_DONE); |
| 401 | if (retval < 0) { |
| 402 | dev_err(&i2c->dev, "BU21013_REG_DONE reg write failed\n"); |
| 403 | return retval; |
| 404 | } |
| 405 | |
| 406 | return 0; |
| 407 | } |
| 408 | |
| 409 | /** |
| 410 | * bu21013_free_irq() - frees IRQ registered for touchscreen |
| 411 | * @bu21013_data: device structure pointer |
| 412 | * |
| 413 | * This function signals interrupt thread to stop processing and |
| 414 | * frees interrupt. |
| 415 | */ |
| 416 | static void bu21013_free_irq(struct bu21013_ts_data *bu21013_data) |
| 417 | { |
| 418 | bu21013_data->touch_stopped = true; |
| 419 | wake_up(&bu21013_data->wait); |
| 420 | free_irq(bu21013_data->chip->irq, bu21013_data); |
| 421 | } |
| 422 | |
| 423 | /** |
| 424 | * bu21013_probe() - initializes the i2c-client touchscreen driver |
| 425 | * @client: i2c client structure pointer |
| 426 | * @id: i2c device id pointer |
| 427 | * |
| 428 | * This function used to initializes the i2c-client touchscreen |
| 429 | * driver and returns integer. |
| 430 | */ |
| 431 | static int __devinit bu21013_probe(struct i2c_client *client, |
| 432 | const struct i2c_device_id *id) |
| 433 | { |
| 434 | struct bu21013_ts_data *bu21013_data; |
| 435 | struct input_dev *in_dev; |
| 436 | const struct bu21013_platform_device *pdata = |
| 437 | client->dev.platform_data; |
| 438 | int error; |
| 439 | |
| 440 | if (!i2c_check_functionality(client->adapter, |
| 441 | I2C_FUNC_SMBUS_BYTE_DATA)) { |
| 442 | dev_err(&client->dev, "i2c smbus byte data not supported\n"); |
| 443 | return -EIO; |
| 444 | } |
| 445 | |
| 446 | if (!pdata) { |
| 447 | dev_err(&client->dev, "platform data not defined\n"); |
| 448 | return -EINVAL; |
| 449 | } |
| 450 | |
| 451 | bu21013_data = kzalloc(sizeof(struct bu21013_ts_data), GFP_KERNEL); |
| 452 | in_dev = input_allocate_device(); |
| 453 | if (!bu21013_data || !in_dev) { |
| 454 | dev_err(&client->dev, "device memory alloc failed\n"); |
| 455 | error = -ENOMEM; |
| 456 | goto err_free_mem; |
| 457 | } |
| 458 | |
| 459 | bu21013_data->in_dev = in_dev; |
| 460 | bu21013_data->chip = pdata; |
| 461 | bu21013_data->client = client; |
Naveen Kumar Gaddipati | 81e78de | 2011-01-17 20:47:31 -0800 | [diff] [blame] | 462 | |
| 463 | bu21013_data->regulator = regulator_get(&client->dev, "V-TOUCH"); |
| 464 | if (IS_ERR(bu21013_data->regulator)) { |
| 465 | dev_err(&client->dev, "regulator_get failed\n"); |
| 466 | error = PTR_ERR(bu21013_data->regulator); |
| 467 | goto err_free_mem; |
| 468 | } |
| 469 | |
| 470 | error = regulator_enable(bu21013_data->regulator); |
| 471 | if (error < 0) { |
| 472 | dev_err(&client->dev, "regulator enable failed\n"); |
| 473 | goto err_put_regulator; |
| 474 | } |
| 475 | |
Naveen Kumar Gaddipati | 4780c8d | 2010-10-04 22:32:48 -0700 | [diff] [blame] | 476 | bu21013_data->touch_stopped = false; |
| 477 | init_waitqueue_head(&bu21013_data->wait); |
| 478 | |
| 479 | /* configure the gpio pins */ |
| 480 | if (pdata->cs_en) { |
| 481 | error = pdata->cs_en(pdata->cs_pin); |
| 482 | if (error < 0) { |
| 483 | dev_err(&client->dev, "chip init failed\n"); |
Naveen Kumar Gaddipati | 81e78de | 2011-01-17 20:47:31 -0800 | [diff] [blame] | 484 | goto err_disable_regulator; |
Naveen Kumar Gaddipati | 4780c8d | 2010-10-04 22:32:48 -0700 | [diff] [blame] | 485 | } |
| 486 | } |
| 487 | |
| 488 | /* configure the touch panel controller */ |
| 489 | error = bu21013_init_chip(bu21013_data); |
| 490 | if (error) { |
| 491 | dev_err(&client->dev, "error in bu21013 config\n"); |
| 492 | goto err_cs_disable; |
| 493 | } |
| 494 | |
| 495 | /* register the device to input subsystem */ |
| 496 | in_dev->name = DRIVER_TP; |
| 497 | in_dev->id.bustype = BUS_I2C; |
| 498 | in_dev->dev.parent = &client->dev; |
| 499 | |
| 500 | __set_bit(EV_SYN, in_dev->evbit); |
| 501 | __set_bit(EV_KEY, in_dev->evbit); |
| 502 | __set_bit(EV_ABS, in_dev->evbit); |
| 503 | |
| 504 | input_set_abs_params(in_dev, ABS_MT_POSITION_X, 0, |
Naveen Kumar Gaddipati | d2763b4 | 2011-01-17 20:40:58 -0800 | [diff] [blame] | 505 | pdata->touch_x_max, 0, 0); |
Naveen Kumar Gaddipati | 4780c8d | 2010-10-04 22:32:48 -0700 | [diff] [blame] | 506 | input_set_abs_params(in_dev, ABS_MT_POSITION_Y, 0, |
Naveen Kumar Gaddipati | d2763b4 | 2011-01-17 20:40:58 -0800 | [diff] [blame] | 507 | pdata->touch_y_max, 0, 0); |
Naveen Kumar Gaddipati | 4780c8d | 2010-10-04 22:32:48 -0700 | [diff] [blame] | 508 | input_set_drvdata(in_dev, bu21013_data); |
| 509 | |
| 510 | error = request_threaded_irq(pdata->irq, NULL, bu21013_gpio_irq, |
| 511 | IRQF_TRIGGER_FALLING | IRQF_SHARED, |
| 512 | DRIVER_TP, bu21013_data); |
| 513 | if (error) { |
| 514 | dev_err(&client->dev, "request irq %d failed\n", pdata->irq); |
| 515 | goto err_cs_disable; |
| 516 | } |
| 517 | |
| 518 | error = input_register_device(in_dev); |
| 519 | if (error) { |
| 520 | dev_err(&client->dev, "failed to register input device\n"); |
| 521 | goto err_free_irq; |
| 522 | } |
| 523 | |
| 524 | device_init_wakeup(&client->dev, pdata->wakeup); |
| 525 | i2c_set_clientdata(client, bu21013_data); |
| 526 | |
| 527 | return 0; |
| 528 | |
| 529 | err_free_irq: |
| 530 | bu21013_free_irq(bu21013_data); |
| 531 | err_cs_disable: |
| 532 | pdata->cs_dis(pdata->cs_pin); |
Naveen Kumar Gaddipati | 81e78de | 2011-01-17 20:47:31 -0800 | [diff] [blame] | 533 | err_disable_regulator: |
| 534 | regulator_disable(bu21013_data->regulator); |
| 535 | err_put_regulator: |
| 536 | regulator_put(bu21013_data->regulator); |
Naveen Kumar Gaddipati | 4780c8d | 2010-10-04 22:32:48 -0700 | [diff] [blame] | 537 | err_free_mem: |
Dan Carpenter | bac64d0 | 2010-10-28 15:09:28 -0700 | [diff] [blame] | 538 | input_free_device(in_dev); |
Naveen Kumar Gaddipati | 4780c8d | 2010-10-04 22:32:48 -0700 | [diff] [blame] | 539 | kfree(bu21013_data); |
| 540 | |
| 541 | return error; |
| 542 | } |
| 543 | /** |
| 544 | * bu21013_remove() - removes the i2c-client touchscreen driver |
| 545 | * @client: i2c client structure pointer |
| 546 | * |
| 547 | * This function uses to remove the i2c-client |
| 548 | * touchscreen driver and returns integer. |
| 549 | */ |
| 550 | static int __devexit bu21013_remove(struct i2c_client *client) |
| 551 | { |
| 552 | struct bu21013_ts_data *bu21013_data = i2c_get_clientdata(client); |
| 553 | |
| 554 | bu21013_free_irq(bu21013_data); |
| 555 | |
| 556 | bu21013_data->chip->cs_dis(bu21013_data->chip->cs_pin); |
| 557 | |
| 558 | input_unregister_device(bu21013_data->in_dev); |
Naveen Kumar Gaddipati | 81e78de | 2011-01-17 20:47:31 -0800 | [diff] [blame] | 559 | |
| 560 | regulator_disable(bu21013_data->regulator); |
| 561 | regulator_put(bu21013_data->regulator); |
| 562 | |
Naveen Kumar Gaddipati | 4780c8d | 2010-10-04 22:32:48 -0700 | [diff] [blame] | 563 | kfree(bu21013_data); |
| 564 | |
| 565 | device_init_wakeup(&client->dev, false); |
| 566 | |
| 567 | return 0; |
| 568 | } |
| 569 | |
| 570 | #ifdef CONFIG_PM |
| 571 | /** |
| 572 | * bu21013_suspend() - suspend the touch screen controller |
| 573 | * @dev: pointer to device structure |
| 574 | * |
| 575 | * This function is used to suspend the |
| 576 | * touch panel controller and returns integer |
| 577 | */ |
| 578 | static int bu21013_suspend(struct device *dev) |
| 579 | { |
| 580 | struct bu21013_ts_data *bu21013_data = dev_get_drvdata(dev); |
| 581 | struct i2c_client *client = bu21013_data->client; |
| 582 | |
| 583 | bu21013_data->touch_stopped = true; |
| 584 | if (device_may_wakeup(&client->dev)) |
| 585 | enable_irq_wake(bu21013_data->chip->irq); |
| 586 | else |
| 587 | disable_irq(bu21013_data->chip->irq); |
| 588 | |
Naveen Kumar Gaddipati | 81e78de | 2011-01-17 20:47:31 -0800 | [diff] [blame] | 589 | regulator_disable(bu21013_data->regulator); |
| 590 | |
Naveen Kumar Gaddipati | 4780c8d | 2010-10-04 22:32:48 -0700 | [diff] [blame] | 591 | return 0; |
| 592 | } |
| 593 | |
| 594 | /** |
| 595 | * bu21013_resume() - resume the touch screen controller |
| 596 | * @dev: pointer to device structure |
| 597 | * |
| 598 | * This function is used to resume the touch panel |
| 599 | * controller and returns integer. |
| 600 | */ |
| 601 | static int bu21013_resume(struct device *dev) |
| 602 | { |
| 603 | struct bu21013_ts_data *bu21013_data = dev_get_drvdata(dev); |
| 604 | struct i2c_client *client = bu21013_data->client; |
| 605 | int retval; |
| 606 | |
Naveen Kumar Gaddipati | 81e78de | 2011-01-17 20:47:31 -0800 | [diff] [blame] | 607 | retval = regulator_enable(bu21013_data->regulator); |
| 608 | if (retval < 0) { |
| 609 | dev_err(&client->dev, "bu21013 regulator enable failed\n"); |
| 610 | return retval; |
| 611 | } |
| 612 | |
Naveen Kumar Gaddipati | 4780c8d | 2010-10-04 22:32:48 -0700 | [diff] [blame] | 613 | retval = bu21013_init_chip(bu21013_data); |
| 614 | if (retval < 0) { |
| 615 | dev_err(&client->dev, "bu21013 controller config failed\n"); |
| 616 | return retval; |
| 617 | } |
| 618 | |
| 619 | bu21013_data->touch_stopped = false; |
| 620 | |
| 621 | if (device_may_wakeup(&client->dev)) |
| 622 | disable_irq_wake(bu21013_data->chip->irq); |
| 623 | else |
| 624 | enable_irq(bu21013_data->chip->irq); |
| 625 | |
| 626 | return 0; |
| 627 | } |
| 628 | |
| 629 | static const struct dev_pm_ops bu21013_dev_pm_ops = { |
| 630 | .suspend = bu21013_suspend, |
| 631 | .resume = bu21013_resume, |
| 632 | }; |
| 633 | #endif |
| 634 | |
| 635 | static const struct i2c_device_id bu21013_id[] = { |
| 636 | { DRIVER_TP, 0 }, |
| 637 | { } |
| 638 | }; |
| 639 | MODULE_DEVICE_TABLE(i2c, bu21013_id); |
| 640 | |
| 641 | static struct i2c_driver bu21013_driver = { |
| 642 | .driver = { |
| 643 | .name = DRIVER_TP, |
| 644 | .owner = THIS_MODULE, |
| 645 | #ifdef CONFIG_PM |
| 646 | .pm = &bu21013_dev_pm_ops, |
| 647 | #endif |
| 648 | }, |
| 649 | .probe = bu21013_probe, |
| 650 | .remove = __devexit_p(bu21013_remove), |
| 651 | .id_table = bu21013_id, |
| 652 | }; |
| 653 | |
| 654 | /** |
| 655 | * bu21013_init() - initializes the bu21013 touchscreen driver |
| 656 | * |
| 657 | * This function used to initializes the bu21013 |
| 658 | * touchscreen driver and returns integer. |
| 659 | */ |
| 660 | static int __init bu21013_init(void) |
| 661 | { |
| 662 | return i2c_add_driver(&bu21013_driver); |
| 663 | } |
| 664 | |
| 665 | /** |
| 666 | * bu21013_exit() - de-initializes the bu21013 touchscreen driver |
| 667 | * |
| 668 | * This function uses to de-initializes the bu21013 |
| 669 | * touchscreen driver and returns none. |
| 670 | */ |
| 671 | static void __exit bu21013_exit(void) |
| 672 | { |
| 673 | i2c_del_driver(&bu21013_driver); |
| 674 | } |
| 675 | |
| 676 | module_init(bu21013_init); |
| 677 | module_exit(bu21013_exit); |
| 678 | |
| 679 | MODULE_LICENSE("GPL v2"); |
| 680 | MODULE_AUTHOR("Naveen Kumar G <naveen.gaddipati@stericsson.com>"); |
| 681 | MODULE_DESCRIPTION("bu21013 touch screen controller driver"); |