1 /* 2 * TSC2005 touchscreen driver 3 * 4 * Copyright (C) 2006-2010 Nokia Corporation 5 * 6 * Author: Lauri Leukkunen <lauri.leukkunen@nokia.com> 7 * based on TSC2301 driver by Klaus K. Pedersen <klaus.k.pedersen@nokia.com> 8 * 9 * This program is free software; you can redistribute it and/or modify 10 * it under the terms of the GNU General Public License as published by 11 * the Free Software Foundation; either version 2 of the License, or 12 * (at your option) any later version. 13 * 14 * This program is distributed in the hope that it will be useful, 15 * but WITHOUT ANY WARRANTY; without even the implied warranty of 16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 17 * GNU General Public License for more details. 18 * 19 * You should have received a copy of the GNU General Public License 20 * along with this program; if not, write to the Free Software 21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 22 * 23 */ 24 25 #include <linux/kernel.h> 26 #include <linux/module.h> 27 #include <linux/input.h> 28 #include <linux/input/touchscreen.h> 29 #include <linux/interrupt.h> 30 #include <linux/delay.h> 31 #include <linux/pm.h> 32 #include <linux/of.h> 33 #include <linux/of_gpio.h> 34 #include <linux/spi/spi.h> 35 #include <linux/spi/tsc2005.h> 36 #include <linux/regulator/consumer.h> 37 #include <linux/regmap.h> 38 39 /* 40 * The touchscreen interface operates as follows: 41 * 42 * 1) Pen is pressed against the touchscreen. 43 * 2) TSC2005 performs AD conversion. 44 * 3) After the conversion is done TSC2005 drives DAV line down. 45 * 4) GPIO IRQ is received and tsc2005_irq_thread() is scheduled. 46 * 5) tsc2005_irq_thread() queues up an spi transfer to fetch the x, y, z1, z2 47 * values. 48 * 6) tsc2005_irq_thread() reports coordinates to input layer and sets up 49 * tsc2005_penup_timer() to be called after TSC2005_PENUP_TIME_MS (40ms). 50 * 7) When the penup timer expires, there have not been touch or DAV interrupts 51 * during the last 40ms which means the pen has been lifted. 52 * 53 * ESD recovery via a hardware reset is done if the TSC2005 doesn't respond 54 * after a configurable period (in ms) of activity. If esd_timeout is 0, the 55 * watchdog is disabled. 56 */ 57 58 /* control byte 1 */ 59 #define TSC2005_CMD 0x80 60 #define TSC2005_CMD_NORMAL 0x00 61 #define TSC2005_CMD_STOP 0x01 62 #define TSC2005_CMD_12BIT 0x04 63 64 /* control byte 0 */ 65 #define TSC2005_REG_READ 0x01 /* R/W access */ 66 #define TSC2005_REG_PND0 0x02 /* Power Not Down Control */ 67 #define TSC2005_REG_X (0x0 << 3) 68 #define TSC2005_REG_Y (0x1 << 3) 69 #define TSC2005_REG_Z1 (0x2 << 3) 70 #define TSC2005_REG_Z2 (0x3 << 3) 71 #define TSC2005_REG_AUX (0x4 << 3) 72 #define TSC2005_REG_TEMP1 (0x5 << 3) 73 #define TSC2005_REG_TEMP2 (0x6 << 3) 74 #define TSC2005_REG_STATUS (0x7 << 3) 75 #define TSC2005_REG_AUX_HIGH (0x8 << 3) 76 #define TSC2005_REG_AUX_LOW (0x9 << 3) 77 #define TSC2005_REG_TEMP_HIGH (0xA << 3) 78 #define TSC2005_REG_TEMP_LOW (0xB << 3) 79 #define TSC2005_REG_CFR0 (0xC << 3) 80 #define TSC2005_REG_CFR1 (0xD << 3) 81 #define TSC2005_REG_CFR2 (0xE << 3) 82 #define TSC2005_REG_CONV_FUNC (0xF << 3) 83 84 /* configuration register 0 */ 85 #define TSC2005_CFR0_PRECHARGE_276US 0x0040 86 #define TSC2005_CFR0_STABTIME_1MS 0x0300 87 #define TSC2005_CFR0_CLOCK_1MHZ 0x1000 88 #define TSC2005_CFR0_RESOLUTION12 0x2000 89 #define TSC2005_CFR0_PENMODE 0x8000 90 #define TSC2005_CFR0_INITVALUE (TSC2005_CFR0_STABTIME_1MS | \ 91 TSC2005_CFR0_CLOCK_1MHZ | \ 92 TSC2005_CFR0_RESOLUTION12 | \ 93 TSC2005_CFR0_PRECHARGE_276US | \ 94 TSC2005_CFR0_PENMODE) 95 96 /* bits common to both read and write of configuration register 0 */ 97 #define TSC2005_CFR0_RW_MASK 0x3fff 98 99 /* configuration register 1 */ 100 #define TSC2005_CFR1_BATCHDELAY_4MS 0x0003 101 #define TSC2005_CFR1_INITVALUE TSC2005_CFR1_BATCHDELAY_4MS 102 103 /* configuration register 2 */ 104 #define TSC2005_CFR2_MAVE_Z 0x0004 105 #define TSC2005_CFR2_MAVE_Y 0x0008 106 #define TSC2005_CFR2_MAVE_X 0x0010 107 #define TSC2005_CFR2_AVG_7 0x0800 108 #define TSC2005_CFR2_MEDIUM_15 0x3000 109 #define TSC2005_CFR2_INITVALUE (TSC2005_CFR2_MAVE_X | \ 110 TSC2005_CFR2_MAVE_Y | \ 111 TSC2005_CFR2_MAVE_Z | \ 112 TSC2005_CFR2_MEDIUM_15 | \ 113 TSC2005_CFR2_AVG_7) 114 115 #define MAX_12BIT 0xfff 116 #define TSC2005_DEF_X_FUZZ 4 117 #define TSC2005_DEF_Y_FUZZ 8 118 #define TSC2005_DEF_P_FUZZ 2 119 #define TSC2005_DEF_RESISTOR 280 120 121 #define TSC2005_SPI_MAX_SPEED_HZ 10000000 122 #define TSC2005_PENUP_TIME_MS 40 123 124 static const struct regmap_range tsc2005_writable_ranges[] = { 125 regmap_reg_range(TSC2005_REG_AUX_HIGH, TSC2005_REG_CFR2), 126 }; 127 128 static const struct regmap_access_table tsc2005_writable_table = { 129 .yes_ranges = tsc2005_writable_ranges, 130 .n_yes_ranges = ARRAY_SIZE(tsc2005_writable_ranges), 131 }; 132 133 static struct regmap_config tsc2005_regmap_config = { 134 .reg_bits = 8, 135 .val_bits = 16, 136 .reg_stride = 0x08, 137 .max_register = 0x78, 138 .read_flag_mask = TSC2005_REG_READ, 139 .write_flag_mask = TSC2005_REG_PND0, 140 .wr_table = &tsc2005_writable_table, 141 .use_single_rw = true, 142 }; 143 144 struct tsc2005_data { 145 u16 x; 146 u16 y; 147 u16 z1; 148 u16 z2; 149 } __packed; 150 #define TSC2005_DATA_REGS 4 151 152 struct tsc2005 { 153 struct spi_device *spi; 154 struct regmap *regmap; 155 156 struct input_dev *idev; 157 char phys[32]; 158 159 struct mutex mutex; 160 161 /* raw copy of previous x,y,z */ 162 int in_x; 163 int in_y; 164 int in_z1; 165 int in_z2; 166 167 spinlock_t lock; 168 struct timer_list penup_timer; 169 170 unsigned int esd_timeout; 171 struct delayed_work esd_work; 172 unsigned long last_valid_interrupt; 173 174 unsigned int x_plate_ohm; 175 176 bool opened; 177 bool suspended; 178 179 bool pen_down; 180 181 struct regulator *vio; 182 183 int reset_gpio; 184 void (*set_reset)(bool enable); 185 }; 186 187 static int tsc2005_cmd(struct tsc2005 *ts, u8 cmd) 188 { 189 u8 tx = TSC2005_CMD | TSC2005_CMD_12BIT | cmd; 190 struct spi_transfer xfer = { 191 .tx_buf = &tx, 192 .len = 1, 193 .bits_per_word = 8, 194 }; 195 struct spi_message msg; 196 int error; 197 198 spi_message_init(&msg); 199 spi_message_add_tail(&xfer, &msg); 200 201 error = spi_sync(ts->spi, &msg); 202 if (error) { 203 dev_err(&ts->spi->dev, "%s: failed, command: %x, error: %d\n", 204 __func__, cmd, error); 205 return error; 206 } 207 208 return 0; 209 } 210 211 static void tsc2005_update_pen_state(struct tsc2005 *ts, 212 int x, int y, int pressure) 213 { 214 if (pressure) { 215 input_report_abs(ts->idev, ABS_X, x); 216 input_report_abs(ts->idev, ABS_Y, y); 217 input_report_abs(ts->idev, ABS_PRESSURE, pressure); 218 if (!ts->pen_down) { 219 input_report_key(ts->idev, BTN_TOUCH, !!pressure); 220 ts->pen_down = true; 221 } 222 } else { 223 input_report_abs(ts->idev, ABS_PRESSURE, 0); 224 if (ts->pen_down) { 225 input_report_key(ts->idev, BTN_TOUCH, 0); 226 ts->pen_down = false; 227 } 228 } 229 input_sync(ts->idev); 230 dev_dbg(&ts->spi->dev, "point(%4d,%4d), pressure (%4d)\n", x, y, 231 pressure); 232 } 233 234 static irqreturn_t tsc2005_irq_thread(int irq, void *_ts) 235 { 236 struct tsc2005 *ts = _ts; 237 unsigned long flags; 238 unsigned int pressure; 239 struct tsc2005_data tsdata; 240 int error; 241 242 /* read the coordinates */ 243 error = regmap_bulk_read(ts->regmap, TSC2005_REG_X, &tsdata, 244 TSC2005_DATA_REGS); 245 if (unlikely(error)) 246 goto out; 247 248 /* validate position */ 249 if (unlikely(tsdata.x > MAX_12BIT || tsdata.y > MAX_12BIT)) 250 goto out; 251 252 /* Skip reading if the pressure components are out of range */ 253 if (unlikely(tsdata.z1 == 0 || tsdata.z2 > MAX_12BIT)) 254 goto out; 255 if (unlikely(tsdata.z1 >= tsdata.z2)) 256 goto out; 257 258 /* 259 * Skip point if this is a pen down with the exact same values as 260 * the value before pen-up - that implies SPI fed us stale data 261 */ 262 if (!ts->pen_down && 263 ts->in_x == tsdata.x && ts->in_y == tsdata.y && 264 ts->in_z1 == tsdata.z1 && ts->in_z2 == tsdata.z2) { 265 goto out; 266 } 267 268 /* 269 * At this point we are happy we have a valid and useful reading. 270 * Remember it for later comparisons. We may now begin downsampling. 271 */ 272 ts->in_x = tsdata.x; 273 ts->in_y = tsdata.y; 274 ts->in_z1 = tsdata.z1; 275 ts->in_z2 = tsdata.z2; 276 277 /* Compute touch pressure resistance using equation #1 */ 278 pressure = tsdata.x * (tsdata.z2 - tsdata.z1) / tsdata.z1; 279 pressure = pressure * ts->x_plate_ohm / 4096; 280 if (unlikely(pressure > MAX_12BIT)) 281 goto out; 282 283 spin_lock_irqsave(&ts->lock, flags); 284 285 tsc2005_update_pen_state(ts, tsdata.x, tsdata.y, pressure); 286 mod_timer(&ts->penup_timer, 287 jiffies + msecs_to_jiffies(TSC2005_PENUP_TIME_MS)); 288 289 spin_unlock_irqrestore(&ts->lock, flags); 290 291 ts->last_valid_interrupt = jiffies; 292 out: 293 return IRQ_HANDLED; 294 } 295 296 static void tsc2005_penup_timer(unsigned long data) 297 { 298 struct tsc2005 *ts = (struct tsc2005 *)data; 299 unsigned long flags; 300 301 spin_lock_irqsave(&ts->lock, flags); 302 tsc2005_update_pen_state(ts, 0, 0, 0); 303 spin_unlock_irqrestore(&ts->lock, flags); 304 } 305 306 static void tsc2005_start_scan(struct tsc2005 *ts) 307 { 308 regmap_write(ts->regmap, TSC2005_REG_CFR0, TSC2005_CFR0_INITVALUE); 309 regmap_write(ts->regmap, TSC2005_REG_CFR1, TSC2005_CFR1_INITVALUE); 310 regmap_write(ts->regmap, TSC2005_REG_CFR2, TSC2005_CFR2_INITVALUE); 311 tsc2005_cmd(ts, TSC2005_CMD_NORMAL); 312 } 313 314 static void tsc2005_stop_scan(struct tsc2005 *ts) 315 { 316 tsc2005_cmd(ts, TSC2005_CMD_STOP); 317 } 318 319 static void tsc2005_set_reset(struct tsc2005 *ts, bool enable) 320 { 321 if (ts->reset_gpio >= 0) 322 gpio_set_value(ts->reset_gpio, enable); 323 else if (ts->set_reset) 324 ts->set_reset(enable); 325 } 326 327 /* must be called with ts->mutex held */ 328 static void __tsc2005_disable(struct tsc2005 *ts) 329 { 330 tsc2005_stop_scan(ts); 331 332 disable_irq(ts->spi->irq); 333 del_timer_sync(&ts->penup_timer); 334 335 cancel_delayed_work_sync(&ts->esd_work); 336 337 enable_irq(ts->spi->irq); 338 } 339 340 /* must be called with ts->mutex held */ 341 static void __tsc2005_enable(struct tsc2005 *ts) 342 { 343 tsc2005_start_scan(ts); 344 345 if (ts->esd_timeout && (ts->set_reset || ts->reset_gpio)) { 346 ts->last_valid_interrupt = jiffies; 347 schedule_delayed_work(&ts->esd_work, 348 round_jiffies_relative( 349 msecs_to_jiffies(ts->esd_timeout))); 350 } 351 352 } 353 354 static ssize_t tsc2005_selftest_show(struct device *dev, 355 struct device_attribute *attr, 356 char *buf) 357 { 358 struct spi_device *spi = to_spi_device(dev); 359 struct tsc2005 *ts = spi_get_drvdata(spi); 360 unsigned int temp_high; 361 unsigned int temp_high_orig; 362 unsigned int temp_high_test; 363 bool success = true; 364 int error; 365 366 mutex_lock(&ts->mutex); 367 368 /* 369 * Test TSC2005 communications via temp high register. 370 */ 371 __tsc2005_disable(ts); 372 373 error = regmap_read(ts->regmap, TSC2005_REG_TEMP_HIGH, &temp_high_orig); 374 if (error) { 375 dev_warn(dev, "selftest failed: read error %d\n", error); 376 success = false; 377 goto out; 378 } 379 380 temp_high_test = (temp_high_orig - 1) & MAX_12BIT; 381 382 error = regmap_write(ts->regmap, TSC2005_REG_TEMP_HIGH, temp_high_test); 383 if (error) { 384 dev_warn(dev, "selftest failed: write error %d\n", error); 385 success = false; 386 goto out; 387 } 388 389 error = regmap_read(ts->regmap, TSC2005_REG_TEMP_HIGH, &temp_high); 390 if (error) { 391 dev_warn(dev, "selftest failed: read error %d after write\n", 392 error); 393 success = false; 394 goto out; 395 } 396 397 if (temp_high != temp_high_test) { 398 dev_warn(dev, "selftest failed: %d != %d\n", 399 temp_high, temp_high_test); 400 success = false; 401 } 402 403 /* hardware reset */ 404 tsc2005_set_reset(ts, false); 405 usleep_range(100, 500); /* only 10us required */ 406 tsc2005_set_reset(ts, true); 407 408 if (!success) 409 goto out; 410 411 /* test that the reset really happened */ 412 error = regmap_read(ts->regmap, TSC2005_REG_TEMP_HIGH, &temp_high); 413 if (error) { 414 dev_warn(dev, "selftest failed: read error %d after reset\n", 415 error); 416 success = false; 417 goto out; 418 } 419 420 if (temp_high != temp_high_orig) { 421 dev_warn(dev, "selftest failed after reset: %d != %d\n", 422 temp_high, temp_high_orig); 423 success = false; 424 } 425 426 out: 427 __tsc2005_enable(ts); 428 mutex_unlock(&ts->mutex); 429 430 return sprintf(buf, "%d\n", success); 431 } 432 433 static DEVICE_ATTR(selftest, S_IRUGO, tsc2005_selftest_show, NULL); 434 435 static struct attribute *tsc2005_attrs[] = { 436 &dev_attr_selftest.attr, 437 NULL 438 }; 439 440 static umode_t tsc2005_attr_is_visible(struct kobject *kobj, 441 struct attribute *attr, int n) 442 { 443 struct device *dev = container_of(kobj, struct device, kobj); 444 struct spi_device *spi = to_spi_device(dev); 445 struct tsc2005 *ts = spi_get_drvdata(spi); 446 umode_t mode = attr->mode; 447 448 if (attr == &dev_attr_selftest.attr) { 449 if (!ts->set_reset && !ts->reset_gpio) 450 mode = 0; 451 } 452 453 return mode; 454 } 455 456 static const struct attribute_group tsc2005_attr_group = { 457 .is_visible = tsc2005_attr_is_visible, 458 .attrs = tsc2005_attrs, 459 }; 460 461 static void tsc2005_esd_work(struct work_struct *work) 462 { 463 struct tsc2005 *ts = container_of(work, struct tsc2005, esd_work.work); 464 int error; 465 unsigned int r; 466 467 if (!mutex_trylock(&ts->mutex)) { 468 /* 469 * If the mutex is taken, it means that disable or enable is in 470 * progress. In that case just reschedule the work. If the work 471 * is not needed, it will be canceled by disable. 472 */ 473 goto reschedule; 474 } 475 476 if (time_is_after_jiffies(ts->last_valid_interrupt + 477 msecs_to_jiffies(ts->esd_timeout))) 478 goto out; 479 480 /* We should be able to read register without disabling interrupts. */ 481 error = regmap_read(ts->regmap, TSC2005_REG_CFR0, &r); 482 if (!error && 483 !((r ^ TSC2005_CFR0_INITVALUE) & TSC2005_CFR0_RW_MASK)) { 484 goto out; 485 } 486 487 /* 488 * If we could not read our known value from configuration register 0 489 * then we should reset the controller as if from power-up and start 490 * scanning again. 491 */ 492 dev_info(&ts->spi->dev, "TSC2005 not responding - resetting\n"); 493 494 disable_irq(ts->spi->irq); 495 del_timer_sync(&ts->penup_timer); 496 497 tsc2005_update_pen_state(ts, 0, 0, 0); 498 499 tsc2005_set_reset(ts, false); 500 usleep_range(100, 500); /* only 10us required */ 501 tsc2005_set_reset(ts, true); 502 503 enable_irq(ts->spi->irq); 504 tsc2005_start_scan(ts); 505 506 out: 507 mutex_unlock(&ts->mutex); 508 reschedule: 509 /* re-arm the watchdog */ 510 schedule_delayed_work(&ts->esd_work, 511 round_jiffies_relative( 512 msecs_to_jiffies(ts->esd_timeout))); 513 } 514 515 static int tsc2005_open(struct input_dev *input) 516 { 517 struct tsc2005 *ts = input_get_drvdata(input); 518 519 mutex_lock(&ts->mutex); 520 521 if (!ts->suspended) 522 __tsc2005_enable(ts); 523 524 ts->opened = true; 525 526 mutex_unlock(&ts->mutex); 527 528 return 0; 529 } 530 531 static void tsc2005_close(struct input_dev *input) 532 { 533 struct tsc2005 *ts = input_get_drvdata(input); 534 535 mutex_lock(&ts->mutex); 536 537 if (!ts->suspended) 538 __tsc2005_disable(ts); 539 540 ts->opened = false; 541 542 mutex_unlock(&ts->mutex); 543 } 544 545 static int tsc2005_probe(struct spi_device *spi) 546 { 547 const struct tsc2005_platform_data *pdata = dev_get_platdata(&spi->dev); 548 struct device_node *np = spi->dev.of_node; 549 550 struct tsc2005 *ts; 551 struct input_dev *input_dev; 552 unsigned int max_x = MAX_12BIT; 553 unsigned int max_y = MAX_12BIT; 554 unsigned int max_p = MAX_12BIT; 555 unsigned int fudge_x = TSC2005_DEF_X_FUZZ; 556 unsigned int fudge_y = TSC2005_DEF_Y_FUZZ; 557 unsigned int fudge_p = TSC2005_DEF_P_FUZZ; 558 unsigned int x_plate_ohm = TSC2005_DEF_RESISTOR; 559 unsigned int esd_timeout; 560 int error; 561 562 if (!np && !pdata) { 563 dev_err(&spi->dev, "no platform data\n"); 564 return -ENODEV; 565 } 566 567 if (spi->irq <= 0) { 568 dev_err(&spi->dev, "no irq\n"); 569 return -ENODEV; 570 } 571 572 if (pdata) { 573 fudge_x = pdata->ts_x_fudge; 574 fudge_y = pdata->ts_y_fudge; 575 fudge_p = pdata->ts_pressure_fudge; 576 max_x = pdata->ts_x_max; 577 max_y = pdata->ts_y_max; 578 max_p = pdata->ts_pressure_max; 579 x_plate_ohm = pdata->ts_x_plate_ohm; 580 esd_timeout = pdata->esd_timeout_ms; 581 } else { 582 x_plate_ohm = TSC2005_DEF_RESISTOR; 583 of_property_read_u32(np, "ti,x-plate-ohms", &x_plate_ohm); 584 esd_timeout = 0; 585 of_property_read_u32(np, "ti,esd-recovery-timeout-ms", 586 &esd_timeout); 587 } 588 589 spi->mode = SPI_MODE_0; 590 spi->bits_per_word = 8; 591 if (!spi->max_speed_hz) 592 spi->max_speed_hz = TSC2005_SPI_MAX_SPEED_HZ; 593 594 error = spi_setup(spi); 595 if (error) 596 return error; 597 598 ts = devm_kzalloc(&spi->dev, sizeof(*ts), GFP_KERNEL); 599 if (!ts) 600 return -ENOMEM; 601 602 input_dev = devm_input_allocate_device(&spi->dev); 603 if (!input_dev) 604 return -ENOMEM; 605 606 ts->spi = spi; 607 ts->idev = input_dev; 608 609 ts->regmap = devm_regmap_init_spi(spi, &tsc2005_regmap_config); 610 if (IS_ERR(ts->regmap)) 611 return PTR_ERR(ts->regmap); 612 613 ts->x_plate_ohm = x_plate_ohm; 614 ts->esd_timeout = esd_timeout; 615 616 if (np) { 617 ts->reset_gpio = of_get_named_gpio(np, "reset-gpios", 0); 618 if (ts->reset_gpio == -EPROBE_DEFER) 619 return ts->reset_gpio; 620 if (ts->reset_gpio < 0) { 621 dev_err(&spi->dev, "error acquiring reset gpio: %d\n", 622 ts->reset_gpio); 623 return ts->reset_gpio; 624 } 625 626 error = devm_gpio_request_one(&spi->dev, ts->reset_gpio, 0, 627 "reset-gpios"); 628 if (error) { 629 dev_err(&spi->dev, "error requesting reset gpio: %d\n", 630 error); 631 return error; 632 } 633 634 ts->vio = devm_regulator_get(&spi->dev, "vio"); 635 if (IS_ERR(ts->vio)) { 636 error = PTR_ERR(ts->vio); 637 dev_err(&spi->dev, "vio regulator missing (%d)", error); 638 return error; 639 } 640 } else { 641 ts->reset_gpio = -1; 642 ts->set_reset = pdata->set_reset; 643 } 644 645 mutex_init(&ts->mutex); 646 647 spin_lock_init(&ts->lock); 648 setup_timer(&ts->penup_timer, tsc2005_penup_timer, (unsigned long)ts); 649 650 INIT_DELAYED_WORK(&ts->esd_work, tsc2005_esd_work); 651 652 snprintf(ts->phys, sizeof(ts->phys), 653 "%s/input-ts", dev_name(&spi->dev)); 654 655 input_dev->name = "TSC2005 touchscreen"; 656 input_dev->phys = ts->phys; 657 input_dev->id.bustype = BUS_SPI; 658 input_dev->dev.parent = &spi->dev; 659 input_dev->evbit[0] = BIT(EV_ABS) | BIT(EV_KEY); 660 input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH); 661 662 input_set_abs_params(input_dev, ABS_X, 0, max_x, fudge_x, 0); 663 input_set_abs_params(input_dev, ABS_Y, 0, max_y, fudge_y, 0); 664 input_set_abs_params(input_dev, ABS_PRESSURE, 0, max_p, fudge_p, 0); 665 666 if (np) 667 touchscreen_parse_properties(input_dev, false); 668 669 input_dev->open = tsc2005_open; 670 input_dev->close = tsc2005_close; 671 672 input_set_drvdata(input_dev, ts); 673 674 /* Ensure the touchscreen is off */ 675 tsc2005_stop_scan(ts); 676 677 error = devm_request_threaded_irq(&spi->dev, spi->irq, NULL, 678 tsc2005_irq_thread, 679 IRQF_TRIGGER_RISING | IRQF_ONESHOT, 680 "tsc2005", ts); 681 if (error) { 682 dev_err(&spi->dev, "Failed to request irq, err: %d\n", error); 683 return error; 684 } 685 686 /* enable regulator for DT */ 687 if (ts->vio) { 688 error = regulator_enable(ts->vio); 689 if (error) 690 return error; 691 } 692 693 spi_set_drvdata(spi, ts); 694 error = sysfs_create_group(&spi->dev.kobj, &tsc2005_attr_group); 695 if (error) { 696 dev_err(&spi->dev, 697 "Failed to create sysfs attributes, err: %d\n", error); 698 goto disable_regulator; 699 } 700 701 error = input_register_device(ts->idev); 702 if (error) { 703 dev_err(&spi->dev, 704 "Failed to register input device, err: %d\n", error); 705 goto err_remove_sysfs; 706 } 707 708 irq_set_irq_wake(spi->irq, 1); 709 return 0; 710 711 err_remove_sysfs: 712 sysfs_remove_group(&spi->dev.kobj, &tsc2005_attr_group); 713 disable_regulator: 714 if (ts->vio) 715 regulator_disable(ts->vio); 716 return error; 717 } 718 719 static int tsc2005_remove(struct spi_device *spi) 720 { 721 struct tsc2005 *ts = spi_get_drvdata(spi); 722 723 sysfs_remove_group(&spi->dev.kobj, &tsc2005_attr_group); 724 725 if (ts->vio) 726 regulator_disable(ts->vio); 727 728 return 0; 729 } 730 731 static int __maybe_unused tsc2005_suspend(struct device *dev) 732 { 733 struct spi_device *spi = to_spi_device(dev); 734 struct tsc2005 *ts = spi_get_drvdata(spi); 735 736 mutex_lock(&ts->mutex); 737 738 if (!ts->suspended && ts->opened) 739 __tsc2005_disable(ts); 740 741 ts->suspended = true; 742 743 mutex_unlock(&ts->mutex); 744 745 return 0; 746 } 747 748 static int __maybe_unused tsc2005_resume(struct device *dev) 749 { 750 struct spi_device *spi = to_spi_device(dev); 751 struct tsc2005 *ts = spi_get_drvdata(spi); 752 753 mutex_lock(&ts->mutex); 754 755 if (ts->suspended && ts->opened) 756 __tsc2005_enable(ts); 757 758 ts->suspended = false; 759 760 mutex_unlock(&ts->mutex); 761 762 return 0; 763 } 764 765 static SIMPLE_DEV_PM_OPS(tsc2005_pm_ops, tsc2005_suspend, tsc2005_resume); 766 767 static struct spi_driver tsc2005_driver = { 768 .driver = { 769 .name = "tsc2005", 770 .owner = THIS_MODULE, 771 .pm = &tsc2005_pm_ops, 772 }, 773 .probe = tsc2005_probe, 774 .remove = tsc2005_remove, 775 }; 776 777 module_spi_driver(tsc2005_driver); 778 779 MODULE_AUTHOR("Lauri Leukkunen <lauri.leukkunen@nokia.com>"); 780 MODULE_DESCRIPTION("TSC2005 Touchscreen Driver"); 781 MODULE_LICENSE("GPL"); 782 MODULE_ALIAS("spi:tsc2005"); 783