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/spi/spi.h> 34 #include <linux/spi/tsc2005.h> 35 #include <linux/regulator/consumer.h> 36 #include <linux/regmap.h> 37 #include <linux/gpio/consumer.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 struct gpio_desc *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) 322 gpiod_set_value_cansleep(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 tsc2005 *ts = dev_get_drvdata(dev); 359 unsigned int temp_high; 360 unsigned int temp_high_orig; 361 unsigned int temp_high_test; 362 bool success = true; 363 int error; 364 365 mutex_lock(&ts->mutex); 366 367 /* 368 * Test TSC2005 communications via temp high register. 369 */ 370 __tsc2005_disable(ts); 371 372 error = regmap_read(ts->regmap, TSC2005_REG_TEMP_HIGH, &temp_high_orig); 373 if (error) { 374 dev_warn(dev, "selftest failed: read error %d\n", error); 375 success = false; 376 goto out; 377 } 378 379 temp_high_test = (temp_high_orig - 1) & MAX_12BIT; 380 381 error = regmap_write(ts->regmap, TSC2005_REG_TEMP_HIGH, temp_high_test); 382 if (error) { 383 dev_warn(dev, "selftest failed: write error %d\n", error); 384 success = false; 385 goto out; 386 } 387 388 error = regmap_read(ts->regmap, TSC2005_REG_TEMP_HIGH, &temp_high); 389 if (error) { 390 dev_warn(dev, "selftest failed: read error %d after write\n", 391 error); 392 success = false; 393 goto out; 394 } 395 396 if (temp_high != temp_high_test) { 397 dev_warn(dev, "selftest failed: %d != %d\n", 398 temp_high, temp_high_test); 399 success = false; 400 } 401 402 /* hardware reset */ 403 tsc2005_set_reset(ts, false); 404 usleep_range(100, 500); /* only 10us required */ 405 tsc2005_set_reset(ts, true); 406 407 if (!success) 408 goto out; 409 410 /* test that the reset really happened */ 411 error = regmap_read(ts->regmap, TSC2005_REG_TEMP_HIGH, &temp_high); 412 if (error) { 413 dev_warn(dev, "selftest failed: read error %d after reset\n", 414 error); 415 success = false; 416 goto out; 417 } 418 419 if (temp_high != temp_high_orig) { 420 dev_warn(dev, "selftest failed after reset: %d != %d\n", 421 temp_high, temp_high_orig); 422 success = false; 423 } 424 425 out: 426 __tsc2005_enable(ts); 427 mutex_unlock(&ts->mutex); 428 429 return sprintf(buf, "%d\n", success); 430 } 431 432 static DEVICE_ATTR(selftest, S_IRUGO, tsc2005_selftest_show, NULL); 433 434 static struct attribute *tsc2005_attrs[] = { 435 &dev_attr_selftest.attr, 436 NULL 437 }; 438 439 static umode_t tsc2005_attr_is_visible(struct kobject *kobj, 440 struct attribute *attr, int n) 441 { 442 struct device *dev = container_of(kobj, struct device, kobj); 443 struct tsc2005 *ts = dev_get_drvdata(dev); 444 umode_t mode = attr->mode; 445 446 if (attr == &dev_attr_selftest.attr) { 447 if (!ts->set_reset && !ts->reset_gpio) 448 mode = 0; 449 } 450 451 return mode; 452 } 453 454 static const struct attribute_group tsc2005_attr_group = { 455 .is_visible = tsc2005_attr_is_visible, 456 .attrs = tsc2005_attrs, 457 }; 458 459 static void tsc2005_esd_work(struct work_struct *work) 460 { 461 struct tsc2005 *ts = container_of(work, struct tsc2005, esd_work.work); 462 int error; 463 unsigned int r; 464 465 if (!mutex_trylock(&ts->mutex)) { 466 /* 467 * If the mutex is taken, it means that disable or enable is in 468 * progress. In that case just reschedule the work. If the work 469 * is not needed, it will be canceled by disable. 470 */ 471 goto reschedule; 472 } 473 474 if (time_is_after_jiffies(ts->last_valid_interrupt + 475 msecs_to_jiffies(ts->esd_timeout))) 476 goto out; 477 478 /* We should be able to read register without disabling interrupts. */ 479 error = regmap_read(ts->regmap, TSC2005_REG_CFR0, &r); 480 if (!error && 481 !((r ^ TSC2005_CFR0_INITVALUE) & TSC2005_CFR0_RW_MASK)) { 482 goto out; 483 } 484 485 /* 486 * If we could not read our known value from configuration register 0 487 * then we should reset the controller as if from power-up and start 488 * scanning again. 489 */ 490 dev_info(&ts->spi->dev, "TSC2005 not responding - resetting\n"); 491 492 disable_irq(ts->spi->irq); 493 del_timer_sync(&ts->penup_timer); 494 495 tsc2005_update_pen_state(ts, 0, 0, 0); 496 497 tsc2005_set_reset(ts, false); 498 usleep_range(100, 500); /* only 10us required */ 499 tsc2005_set_reset(ts, true); 500 501 enable_irq(ts->spi->irq); 502 tsc2005_start_scan(ts); 503 504 out: 505 mutex_unlock(&ts->mutex); 506 reschedule: 507 /* re-arm the watchdog */ 508 schedule_delayed_work(&ts->esd_work, 509 round_jiffies_relative( 510 msecs_to_jiffies(ts->esd_timeout))); 511 } 512 513 static int tsc2005_open(struct input_dev *input) 514 { 515 struct tsc2005 *ts = input_get_drvdata(input); 516 517 mutex_lock(&ts->mutex); 518 519 if (!ts->suspended) 520 __tsc2005_enable(ts); 521 522 ts->opened = true; 523 524 mutex_unlock(&ts->mutex); 525 526 return 0; 527 } 528 529 static void tsc2005_close(struct input_dev *input) 530 { 531 struct tsc2005 *ts = input_get_drvdata(input); 532 533 mutex_lock(&ts->mutex); 534 535 if (!ts->suspended) 536 __tsc2005_disable(ts); 537 538 ts->opened = false; 539 540 mutex_unlock(&ts->mutex); 541 } 542 543 static int tsc2005_probe(struct spi_device *spi) 544 { 545 const struct tsc2005_platform_data *pdata = dev_get_platdata(&spi->dev); 546 struct device_node *np = spi->dev.of_node; 547 548 struct tsc2005 *ts; 549 struct input_dev *input_dev; 550 unsigned int max_x = MAX_12BIT; 551 unsigned int max_y = MAX_12BIT; 552 unsigned int max_p = MAX_12BIT; 553 unsigned int fudge_x = TSC2005_DEF_X_FUZZ; 554 unsigned int fudge_y = TSC2005_DEF_Y_FUZZ; 555 unsigned int fudge_p = TSC2005_DEF_P_FUZZ; 556 unsigned int x_plate_ohm = TSC2005_DEF_RESISTOR; 557 unsigned int esd_timeout; 558 int error; 559 560 if (!np && !pdata) { 561 dev_err(&spi->dev, "no platform data\n"); 562 return -ENODEV; 563 } 564 565 if (spi->irq <= 0) { 566 dev_err(&spi->dev, "no irq\n"); 567 return -ENODEV; 568 } 569 570 if (pdata) { 571 fudge_x = pdata->ts_x_fudge; 572 fudge_y = pdata->ts_y_fudge; 573 fudge_p = pdata->ts_pressure_fudge; 574 max_x = pdata->ts_x_max; 575 max_y = pdata->ts_y_max; 576 max_p = pdata->ts_pressure_max; 577 x_plate_ohm = pdata->ts_x_plate_ohm; 578 esd_timeout = pdata->esd_timeout_ms; 579 } else { 580 x_plate_ohm = TSC2005_DEF_RESISTOR; 581 of_property_read_u32(np, "ti,x-plate-ohms", &x_plate_ohm); 582 esd_timeout = 0; 583 of_property_read_u32(np, "ti,esd-recovery-timeout-ms", 584 &esd_timeout); 585 } 586 587 spi->mode = SPI_MODE_0; 588 spi->bits_per_word = 8; 589 if (!spi->max_speed_hz) 590 spi->max_speed_hz = TSC2005_SPI_MAX_SPEED_HZ; 591 592 error = spi_setup(spi); 593 if (error) 594 return error; 595 596 ts = devm_kzalloc(&spi->dev, sizeof(*ts), GFP_KERNEL); 597 if (!ts) 598 return -ENOMEM; 599 600 input_dev = devm_input_allocate_device(&spi->dev); 601 if (!input_dev) 602 return -ENOMEM; 603 604 ts->spi = spi; 605 ts->idev = input_dev; 606 607 ts->regmap = devm_regmap_init_spi(spi, &tsc2005_regmap_config); 608 if (IS_ERR(ts->regmap)) 609 return PTR_ERR(ts->regmap); 610 611 ts->x_plate_ohm = x_plate_ohm; 612 ts->esd_timeout = esd_timeout; 613 614 ts->reset_gpio = devm_gpiod_get_optional(&spi->dev, "reset", 615 GPIOD_OUT_HIGH); 616 if (IS_ERR(ts->reset_gpio)) { 617 error = PTR_ERR(ts->reset_gpio); 618 dev_err(&spi->dev, "error acquiring reset gpio: %d\n", error); 619 return error; 620 } 621 622 ts->vio = devm_regulator_get_optional(&spi->dev, "vio"); 623 if (IS_ERR(ts->vio)) { 624 error = PTR_ERR(ts->vio); 625 dev_err(&spi->dev, "vio regulator missing (%d)", error); 626 return error; 627 } 628 629 if (!ts->reset_gpio && pdata) 630 ts->set_reset = pdata->set_reset; 631 632 mutex_init(&ts->mutex); 633 634 spin_lock_init(&ts->lock); 635 setup_timer(&ts->penup_timer, tsc2005_penup_timer, (unsigned long)ts); 636 637 INIT_DELAYED_WORK(&ts->esd_work, tsc2005_esd_work); 638 639 snprintf(ts->phys, sizeof(ts->phys), 640 "%s/input-ts", dev_name(&spi->dev)); 641 642 input_dev->name = "TSC2005 touchscreen"; 643 input_dev->phys = ts->phys; 644 input_dev->id.bustype = BUS_SPI; 645 input_dev->dev.parent = &spi->dev; 646 input_dev->evbit[0] = BIT(EV_ABS) | BIT(EV_KEY); 647 input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH); 648 649 input_set_abs_params(input_dev, ABS_X, 0, max_x, fudge_x, 0); 650 input_set_abs_params(input_dev, ABS_Y, 0, max_y, fudge_y, 0); 651 input_set_abs_params(input_dev, ABS_PRESSURE, 0, max_p, fudge_p, 0); 652 653 if (np) 654 touchscreen_parse_properties(input_dev, false); 655 656 input_dev->open = tsc2005_open; 657 input_dev->close = tsc2005_close; 658 659 input_set_drvdata(input_dev, ts); 660 661 /* Ensure the touchscreen is off */ 662 tsc2005_stop_scan(ts); 663 664 error = devm_request_threaded_irq(&spi->dev, spi->irq, NULL, 665 tsc2005_irq_thread, 666 IRQF_TRIGGER_RISING | IRQF_ONESHOT, 667 "tsc2005", ts); 668 if (error) { 669 dev_err(&spi->dev, "Failed to request irq, err: %d\n", error); 670 return error; 671 } 672 673 /* enable regulator for DT */ 674 if (ts->vio) { 675 error = regulator_enable(ts->vio); 676 if (error) 677 return error; 678 } 679 680 dev_set_drvdata(&spi->dev, ts); 681 error = sysfs_create_group(&spi->dev.kobj, &tsc2005_attr_group); 682 if (error) { 683 dev_err(&spi->dev, 684 "Failed to create sysfs attributes, err: %d\n", error); 685 goto disable_regulator; 686 } 687 688 error = input_register_device(ts->idev); 689 if (error) { 690 dev_err(&spi->dev, 691 "Failed to register input device, err: %d\n", error); 692 goto err_remove_sysfs; 693 } 694 695 irq_set_irq_wake(spi->irq, 1); 696 return 0; 697 698 err_remove_sysfs: 699 sysfs_remove_group(&spi->dev.kobj, &tsc2005_attr_group); 700 disable_regulator: 701 if (ts->vio) 702 regulator_disable(ts->vio); 703 return error; 704 } 705 706 static int tsc2005_remove(struct spi_device *spi) 707 { 708 struct tsc2005 *ts = dev_get_drvdata(&spi->dev); 709 710 sysfs_remove_group(&spi->dev.kobj, &tsc2005_attr_group); 711 712 if (ts->vio) 713 regulator_disable(ts->vio); 714 715 return 0; 716 } 717 718 static int __maybe_unused tsc2005_suspend(struct device *dev) 719 { 720 struct tsc2005 *ts = dev_get_drvdata(dev); 721 722 mutex_lock(&ts->mutex); 723 724 if (!ts->suspended && ts->opened) 725 __tsc2005_disable(ts); 726 727 ts->suspended = true; 728 729 mutex_unlock(&ts->mutex); 730 731 return 0; 732 } 733 734 static int __maybe_unused tsc2005_resume(struct device *dev) 735 { 736 struct tsc2005 *ts = dev_get_drvdata(dev); 737 738 mutex_lock(&ts->mutex); 739 740 if (ts->suspended && ts->opened) 741 __tsc2005_enable(ts); 742 743 ts->suspended = false; 744 745 mutex_unlock(&ts->mutex); 746 747 return 0; 748 } 749 750 static SIMPLE_DEV_PM_OPS(tsc2005_pm_ops, tsc2005_suspend, tsc2005_resume); 751 752 static struct spi_driver tsc2005_driver = { 753 .driver = { 754 .name = "tsc2005", 755 .owner = THIS_MODULE, 756 .pm = &tsc2005_pm_ops, 757 }, 758 .probe = tsc2005_probe, 759 .remove = tsc2005_remove, 760 }; 761 762 module_spi_driver(tsc2005_driver); 763 764 MODULE_AUTHOR("Lauri Leukkunen <lauri.leukkunen@nokia.com>"); 765 MODULE_DESCRIPTION("TSC2005 Touchscreen Driver"); 766 MODULE_LICENSE("GPL"); 767 MODULE_ALIAS("spi:tsc2005"); 768