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 38 /* 39 * The touchscreen interface operates as follows: 40 * 41 * 1) Pen is pressed against the touchscreen. 42 * 2) TSC2005 performs AD conversion. 43 * 3) After the conversion is done TSC2005 drives DAV line down. 44 * 4) GPIO IRQ is received and tsc2005_irq_thread() is scheduled. 45 * 5) tsc2005_irq_thread() queues up an spi transfer to fetch the x, y, z1, z2 46 * values. 47 * 6) tsc2005_irq_thread() reports coordinates to input layer and sets up 48 * tsc2005_penup_timer() to be called after TSC2005_PENUP_TIME_MS (40ms). 49 * 7) When the penup timer expires, there have not been touch or DAV interrupts 50 * during the last 40ms which means the pen has been lifted. 51 * 52 * ESD recovery via a hardware reset is done if the TSC2005 doesn't respond 53 * after a configurable period (in ms) of activity. If esd_timeout is 0, the 54 * watchdog is disabled. 55 */ 56 57 /* control byte 1 */ 58 #define TSC2005_CMD 0x80 59 #define TSC2005_CMD_NORMAL 0x00 60 #define TSC2005_CMD_STOP 0x01 61 #define TSC2005_CMD_12BIT 0x04 62 63 /* control byte 0 */ 64 #define TSC2005_REG_READ 0x01 /* R/W access */ 65 #define TSC2005_REG_PND0 0x02 /* Power Not Down Control */ 66 #define TSC2005_REG_X (0x0 << 3) 67 #define TSC2005_REG_Y (0x1 << 3) 68 #define TSC2005_REG_Z1 (0x2 << 3) 69 #define TSC2005_REG_Z2 (0x3 << 3) 70 #define TSC2005_REG_AUX (0x4 << 3) 71 #define TSC2005_REG_TEMP1 (0x5 << 3) 72 #define TSC2005_REG_TEMP2 (0x6 << 3) 73 #define TSC2005_REG_STATUS (0x7 << 3) 74 #define TSC2005_REG_AUX_HIGH (0x8 << 3) 75 #define TSC2005_REG_AUX_LOW (0x9 << 3) 76 #define TSC2005_REG_TEMP_HIGH (0xA << 3) 77 #define TSC2005_REG_TEMP_LOW (0xB << 3) 78 #define TSC2005_REG_CFR0 (0xC << 3) 79 #define TSC2005_REG_CFR1 (0xD << 3) 80 #define TSC2005_REG_CFR2 (0xE << 3) 81 #define TSC2005_REG_CONV_FUNC (0xF << 3) 82 83 /* configuration register 0 */ 84 #define TSC2005_CFR0_PRECHARGE_276US 0x0040 85 #define TSC2005_CFR0_STABTIME_1MS 0x0300 86 #define TSC2005_CFR0_CLOCK_1MHZ 0x1000 87 #define TSC2005_CFR0_RESOLUTION12 0x2000 88 #define TSC2005_CFR0_PENMODE 0x8000 89 #define TSC2005_CFR0_INITVALUE (TSC2005_CFR0_STABTIME_1MS | \ 90 TSC2005_CFR0_CLOCK_1MHZ | \ 91 TSC2005_CFR0_RESOLUTION12 | \ 92 TSC2005_CFR0_PRECHARGE_276US | \ 93 TSC2005_CFR0_PENMODE) 94 95 /* bits common to both read and write of configuration register 0 */ 96 #define TSC2005_CFR0_RW_MASK 0x3fff 97 98 /* configuration register 1 */ 99 #define TSC2005_CFR1_BATCHDELAY_4MS 0x0003 100 #define TSC2005_CFR1_INITVALUE TSC2005_CFR1_BATCHDELAY_4MS 101 102 /* configuration register 2 */ 103 #define TSC2005_CFR2_MAVE_Z 0x0004 104 #define TSC2005_CFR2_MAVE_Y 0x0008 105 #define TSC2005_CFR2_MAVE_X 0x0010 106 #define TSC2005_CFR2_AVG_7 0x0800 107 #define TSC2005_CFR2_MEDIUM_15 0x3000 108 #define TSC2005_CFR2_INITVALUE (TSC2005_CFR2_MAVE_X | \ 109 TSC2005_CFR2_MAVE_Y | \ 110 TSC2005_CFR2_MAVE_Z | \ 111 TSC2005_CFR2_MEDIUM_15 | \ 112 TSC2005_CFR2_AVG_7) 113 114 #define MAX_12BIT 0xfff 115 #define TSC2005_DEF_X_FUZZ 4 116 #define TSC2005_DEF_Y_FUZZ 8 117 #define TSC2005_DEF_P_FUZZ 2 118 #define TSC2005_DEF_RESISTOR 280 119 120 #define TSC2005_SPI_MAX_SPEED_HZ 10000000 121 #define TSC2005_PENUP_TIME_MS 40 122 123 struct tsc2005_spi_rd { 124 struct spi_transfer spi_xfer; 125 u32 spi_tx; 126 u32 spi_rx; 127 }; 128 129 struct tsc2005 { 130 struct spi_device *spi; 131 132 struct spi_message spi_read_msg; 133 struct tsc2005_spi_rd spi_x; 134 struct tsc2005_spi_rd spi_y; 135 struct tsc2005_spi_rd spi_z1; 136 struct tsc2005_spi_rd spi_z2; 137 138 struct input_dev *idev; 139 char phys[32]; 140 141 struct mutex mutex; 142 143 /* raw copy of previous x,y,z */ 144 int in_x; 145 int in_y; 146 int in_z1; 147 int in_z2; 148 149 spinlock_t lock; 150 struct timer_list penup_timer; 151 152 unsigned int esd_timeout; 153 struct delayed_work esd_work; 154 unsigned long last_valid_interrupt; 155 156 unsigned int x_plate_ohm; 157 158 bool opened; 159 bool suspended; 160 161 bool pen_down; 162 163 struct regulator *vio; 164 165 int reset_gpio; 166 void (*set_reset)(bool enable); 167 }; 168 169 static int tsc2005_cmd(struct tsc2005 *ts, u8 cmd) 170 { 171 u8 tx = TSC2005_CMD | TSC2005_CMD_12BIT | cmd; 172 struct spi_transfer xfer = { 173 .tx_buf = &tx, 174 .len = 1, 175 .bits_per_word = 8, 176 }; 177 struct spi_message msg; 178 int error; 179 180 spi_message_init(&msg); 181 spi_message_add_tail(&xfer, &msg); 182 183 error = spi_sync(ts->spi, &msg); 184 if (error) { 185 dev_err(&ts->spi->dev, "%s: failed, command: %x, error: %d\n", 186 __func__, cmd, error); 187 return error; 188 } 189 190 return 0; 191 } 192 193 static int tsc2005_write(struct tsc2005 *ts, u8 reg, u16 value) 194 { 195 u32 tx = ((reg | TSC2005_REG_PND0) << 16) | value; 196 struct spi_transfer xfer = { 197 .tx_buf = &tx, 198 .len = 4, 199 .bits_per_word = 24, 200 }; 201 struct spi_message msg; 202 int error; 203 204 spi_message_init(&msg); 205 spi_message_add_tail(&xfer, &msg); 206 207 error = spi_sync(ts->spi, &msg); 208 if (error) { 209 dev_err(&ts->spi->dev, 210 "%s: failed, register: %x, value: %x, error: %d\n", 211 __func__, reg, value, error); 212 return error; 213 } 214 215 return 0; 216 } 217 218 static void tsc2005_setup_read(struct tsc2005_spi_rd *rd, u8 reg, bool last) 219 { 220 memset(rd, 0, sizeof(*rd)); 221 222 rd->spi_tx = (reg | TSC2005_REG_READ) << 16; 223 rd->spi_xfer.tx_buf = &rd->spi_tx; 224 rd->spi_xfer.rx_buf = &rd->spi_rx; 225 rd->spi_xfer.len = 4; 226 rd->spi_xfer.bits_per_word = 24; 227 rd->spi_xfer.cs_change = !last; 228 } 229 230 static int tsc2005_read(struct tsc2005 *ts, u8 reg, u16 *value) 231 { 232 struct tsc2005_spi_rd spi_rd; 233 struct spi_message msg; 234 int error; 235 236 tsc2005_setup_read(&spi_rd, reg, true); 237 238 spi_message_init(&msg); 239 spi_message_add_tail(&spi_rd.spi_xfer, &msg); 240 241 error = spi_sync(ts->spi, &msg); 242 if (error) 243 return error; 244 245 *value = spi_rd.spi_rx; 246 return 0; 247 } 248 249 static void tsc2005_update_pen_state(struct tsc2005 *ts, 250 int x, int y, int pressure) 251 { 252 if (pressure) { 253 input_report_abs(ts->idev, ABS_X, x); 254 input_report_abs(ts->idev, ABS_Y, y); 255 input_report_abs(ts->idev, ABS_PRESSURE, pressure); 256 if (!ts->pen_down) { 257 input_report_key(ts->idev, BTN_TOUCH, !!pressure); 258 ts->pen_down = true; 259 } 260 } else { 261 input_report_abs(ts->idev, ABS_PRESSURE, 0); 262 if (ts->pen_down) { 263 input_report_key(ts->idev, BTN_TOUCH, 0); 264 ts->pen_down = false; 265 } 266 } 267 input_sync(ts->idev); 268 dev_dbg(&ts->spi->dev, "point(%4d,%4d), pressure (%4d)\n", x, y, 269 pressure); 270 } 271 272 static irqreturn_t tsc2005_irq_thread(int irq, void *_ts) 273 { 274 struct tsc2005 *ts = _ts; 275 unsigned long flags; 276 unsigned int pressure; 277 u32 x, y; 278 u32 z1, z2; 279 int error; 280 281 /* read the coordinates */ 282 error = spi_sync(ts->spi, &ts->spi_read_msg); 283 if (unlikely(error)) 284 goto out; 285 286 x = ts->spi_x.spi_rx; 287 y = ts->spi_y.spi_rx; 288 z1 = ts->spi_z1.spi_rx; 289 z2 = ts->spi_z2.spi_rx; 290 291 /* validate position */ 292 if (unlikely(x > MAX_12BIT || y > MAX_12BIT)) 293 goto out; 294 295 /* Skip reading if the pressure components are out of range */ 296 if (unlikely(z1 == 0 || z2 > MAX_12BIT || z1 >= z2)) 297 goto out; 298 299 /* 300 * Skip point if this is a pen down with the exact same values as 301 * the value before pen-up - that implies SPI fed us stale data 302 */ 303 if (!ts->pen_down && 304 ts->in_x == x && ts->in_y == y && 305 ts->in_z1 == z1 && ts->in_z2 == z2) { 306 goto out; 307 } 308 309 /* 310 * At this point we are happy we have a valid and useful reading. 311 * Remember it for later comparisons. We may now begin downsampling. 312 */ 313 ts->in_x = x; 314 ts->in_y = y; 315 ts->in_z1 = z1; 316 ts->in_z2 = z2; 317 318 /* Compute touch pressure resistance using equation #1 */ 319 pressure = x * (z2 - z1) / z1; 320 pressure = pressure * ts->x_plate_ohm / 4096; 321 if (unlikely(pressure > MAX_12BIT)) 322 goto out; 323 324 spin_lock_irqsave(&ts->lock, flags); 325 326 tsc2005_update_pen_state(ts, x, y, pressure); 327 mod_timer(&ts->penup_timer, 328 jiffies + msecs_to_jiffies(TSC2005_PENUP_TIME_MS)); 329 330 spin_unlock_irqrestore(&ts->lock, flags); 331 332 ts->last_valid_interrupt = jiffies; 333 out: 334 return IRQ_HANDLED; 335 } 336 337 static void tsc2005_penup_timer(unsigned long data) 338 { 339 struct tsc2005 *ts = (struct tsc2005 *)data; 340 unsigned long flags; 341 342 spin_lock_irqsave(&ts->lock, flags); 343 tsc2005_update_pen_state(ts, 0, 0, 0); 344 spin_unlock_irqrestore(&ts->lock, flags); 345 } 346 347 static void tsc2005_start_scan(struct tsc2005 *ts) 348 { 349 tsc2005_write(ts, TSC2005_REG_CFR0, TSC2005_CFR0_INITVALUE); 350 tsc2005_write(ts, TSC2005_REG_CFR1, TSC2005_CFR1_INITVALUE); 351 tsc2005_write(ts, TSC2005_REG_CFR2, TSC2005_CFR2_INITVALUE); 352 tsc2005_cmd(ts, TSC2005_CMD_NORMAL); 353 } 354 355 static void tsc2005_stop_scan(struct tsc2005 *ts) 356 { 357 tsc2005_cmd(ts, TSC2005_CMD_STOP); 358 } 359 360 static void tsc2005_set_reset(struct tsc2005 *ts, bool enable) 361 { 362 if (ts->reset_gpio >= 0) 363 gpio_set_value(ts->reset_gpio, enable); 364 else if (ts->set_reset) 365 ts->set_reset(enable); 366 } 367 368 /* must be called with ts->mutex held */ 369 static void __tsc2005_disable(struct tsc2005 *ts) 370 { 371 tsc2005_stop_scan(ts); 372 373 disable_irq(ts->spi->irq); 374 del_timer_sync(&ts->penup_timer); 375 376 cancel_delayed_work_sync(&ts->esd_work); 377 378 enable_irq(ts->spi->irq); 379 } 380 381 /* must be called with ts->mutex held */ 382 static void __tsc2005_enable(struct tsc2005 *ts) 383 { 384 tsc2005_start_scan(ts); 385 386 if (ts->esd_timeout && (ts->set_reset || ts->reset_gpio)) { 387 ts->last_valid_interrupt = jiffies; 388 schedule_delayed_work(&ts->esd_work, 389 round_jiffies_relative( 390 msecs_to_jiffies(ts->esd_timeout))); 391 } 392 393 } 394 395 static ssize_t tsc2005_selftest_show(struct device *dev, 396 struct device_attribute *attr, 397 char *buf) 398 { 399 struct spi_device *spi = to_spi_device(dev); 400 struct tsc2005 *ts = spi_get_drvdata(spi); 401 u16 temp_high; 402 u16 temp_high_orig; 403 u16 temp_high_test; 404 bool success = true; 405 int error; 406 407 mutex_lock(&ts->mutex); 408 409 /* 410 * Test TSC2005 communications via temp high register. 411 */ 412 __tsc2005_disable(ts); 413 414 error = tsc2005_read(ts, TSC2005_REG_TEMP_HIGH, &temp_high_orig); 415 if (error) { 416 dev_warn(dev, "selftest failed: read error %d\n", error); 417 success = false; 418 goto out; 419 } 420 421 temp_high_test = (temp_high_orig - 1) & MAX_12BIT; 422 423 error = tsc2005_write(ts, TSC2005_REG_TEMP_HIGH, temp_high_test); 424 if (error) { 425 dev_warn(dev, "selftest failed: write error %d\n", error); 426 success = false; 427 goto out; 428 } 429 430 error = tsc2005_read(ts, TSC2005_REG_TEMP_HIGH, &temp_high); 431 if (error) { 432 dev_warn(dev, "selftest failed: read error %d after write\n", 433 error); 434 success = false; 435 goto out; 436 } 437 438 if (temp_high != temp_high_test) { 439 dev_warn(dev, "selftest failed: %d != %d\n", 440 temp_high, temp_high_test); 441 success = false; 442 } 443 444 /* hardware reset */ 445 tsc2005_set_reset(ts, false); 446 usleep_range(100, 500); /* only 10us required */ 447 tsc2005_set_reset(ts, true); 448 449 if (!success) 450 goto out; 451 452 /* test that the reset really happened */ 453 error = tsc2005_read(ts, TSC2005_REG_TEMP_HIGH, &temp_high); 454 if (error) { 455 dev_warn(dev, "selftest failed: read error %d after reset\n", 456 error); 457 success = false; 458 goto out; 459 } 460 461 if (temp_high != temp_high_orig) { 462 dev_warn(dev, "selftest failed after reset: %d != %d\n", 463 temp_high, temp_high_orig); 464 success = false; 465 } 466 467 out: 468 __tsc2005_enable(ts); 469 mutex_unlock(&ts->mutex); 470 471 return sprintf(buf, "%d\n", success); 472 } 473 474 static DEVICE_ATTR(selftest, S_IRUGO, tsc2005_selftest_show, NULL); 475 476 static struct attribute *tsc2005_attrs[] = { 477 &dev_attr_selftest.attr, 478 NULL 479 }; 480 481 static umode_t tsc2005_attr_is_visible(struct kobject *kobj, 482 struct attribute *attr, int n) 483 { 484 struct device *dev = container_of(kobj, struct device, kobj); 485 struct spi_device *spi = to_spi_device(dev); 486 struct tsc2005 *ts = spi_get_drvdata(spi); 487 umode_t mode = attr->mode; 488 489 if (attr == &dev_attr_selftest.attr) { 490 if (!ts->set_reset && !ts->reset_gpio) 491 mode = 0; 492 } 493 494 return mode; 495 } 496 497 static const struct attribute_group tsc2005_attr_group = { 498 .is_visible = tsc2005_attr_is_visible, 499 .attrs = tsc2005_attrs, 500 }; 501 502 static void tsc2005_esd_work(struct work_struct *work) 503 { 504 struct tsc2005 *ts = container_of(work, struct tsc2005, esd_work.work); 505 int error; 506 u16 r; 507 508 if (!mutex_trylock(&ts->mutex)) { 509 /* 510 * If the mutex is taken, it means that disable or enable is in 511 * progress. In that case just reschedule the work. If the work 512 * is not needed, it will be canceled by disable. 513 */ 514 goto reschedule; 515 } 516 517 if (time_is_after_jiffies(ts->last_valid_interrupt + 518 msecs_to_jiffies(ts->esd_timeout))) 519 goto out; 520 521 /* We should be able to read register without disabling interrupts. */ 522 error = tsc2005_read(ts, TSC2005_REG_CFR0, &r); 523 if (!error && 524 !((r ^ TSC2005_CFR0_INITVALUE) & TSC2005_CFR0_RW_MASK)) { 525 goto out; 526 } 527 528 /* 529 * If we could not read our known value from configuration register 0 530 * then we should reset the controller as if from power-up and start 531 * scanning again. 532 */ 533 dev_info(&ts->spi->dev, "TSC2005 not responding - resetting\n"); 534 535 disable_irq(ts->spi->irq); 536 del_timer_sync(&ts->penup_timer); 537 538 tsc2005_update_pen_state(ts, 0, 0, 0); 539 540 tsc2005_set_reset(ts, false); 541 usleep_range(100, 500); /* only 10us required */ 542 tsc2005_set_reset(ts, true); 543 544 enable_irq(ts->spi->irq); 545 tsc2005_start_scan(ts); 546 547 out: 548 mutex_unlock(&ts->mutex); 549 reschedule: 550 /* re-arm the watchdog */ 551 schedule_delayed_work(&ts->esd_work, 552 round_jiffies_relative( 553 msecs_to_jiffies(ts->esd_timeout))); 554 } 555 556 static int tsc2005_open(struct input_dev *input) 557 { 558 struct tsc2005 *ts = input_get_drvdata(input); 559 560 mutex_lock(&ts->mutex); 561 562 if (!ts->suspended) 563 __tsc2005_enable(ts); 564 565 ts->opened = true; 566 567 mutex_unlock(&ts->mutex); 568 569 return 0; 570 } 571 572 static void tsc2005_close(struct input_dev *input) 573 { 574 struct tsc2005 *ts = input_get_drvdata(input); 575 576 mutex_lock(&ts->mutex); 577 578 if (!ts->suspended) 579 __tsc2005_disable(ts); 580 581 ts->opened = false; 582 583 mutex_unlock(&ts->mutex); 584 } 585 586 static void tsc2005_setup_spi_xfer(struct tsc2005 *ts) 587 { 588 tsc2005_setup_read(&ts->spi_x, TSC2005_REG_X, false); 589 tsc2005_setup_read(&ts->spi_y, TSC2005_REG_Y, false); 590 tsc2005_setup_read(&ts->spi_z1, TSC2005_REG_Z1, false); 591 tsc2005_setup_read(&ts->spi_z2, TSC2005_REG_Z2, true); 592 593 spi_message_init(&ts->spi_read_msg); 594 spi_message_add_tail(&ts->spi_x.spi_xfer, &ts->spi_read_msg); 595 spi_message_add_tail(&ts->spi_y.spi_xfer, &ts->spi_read_msg); 596 spi_message_add_tail(&ts->spi_z1.spi_xfer, &ts->spi_read_msg); 597 spi_message_add_tail(&ts->spi_z2.spi_xfer, &ts->spi_read_msg); 598 } 599 600 static int tsc2005_probe(struct spi_device *spi) 601 { 602 const struct tsc2005_platform_data *pdata = dev_get_platdata(&spi->dev); 603 struct device_node *np = spi->dev.of_node; 604 605 struct tsc2005 *ts; 606 struct input_dev *input_dev; 607 unsigned int max_x = MAX_12BIT; 608 unsigned int max_y = MAX_12BIT; 609 unsigned int max_p = MAX_12BIT; 610 unsigned int fudge_x = TSC2005_DEF_X_FUZZ; 611 unsigned int fudge_y = TSC2005_DEF_Y_FUZZ; 612 unsigned int fudge_p = TSC2005_DEF_P_FUZZ; 613 unsigned int x_plate_ohm = TSC2005_DEF_RESISTOR; 614 unsigned int esd_timeout; 615 int error; 616 617 if (!np && !pdata) { 618 dev_err(&spi->dev, "no platform data\n"); 619 return -ENODEV; 620 } 621 622 if (spi->irq <= 0) { 623 dev_err(&spi->dev, "no irq\n"); 624 return -ENODEV; 625 } 626 627 if (pdata) { 628 fudge_x = pdata->ts_x_fudge; 629 fudge_y = pdata->ts_y_fudge; 630 fudge_p = pdata->ts_pressure_fudge; 631 max_x = pdata->ts_x_max; 632 max_y = pdata->ts_y_max; 633 max_p = pdata->ts_pressure_max; 634 x_plate_ohm = pdata->ts_x_plate_ohm; 635 esd_timeout = pdata->esd_timeout_ms; 636 } else { 637 x_plate_ohm = TSC2005_DEF_RESISTOR; 638 of_property_read_u32(np, "ti,x-plate-ohms", &x_plate_ohm); 639 esd_timeout = 0; 640 of_property_read_u32(np, "ti,esd-recovery-timeout-ms", 641 &esd_timeout); 642 } 643 644 spi->mode = SPI_MODE_0; 645 spi->bits_per_word = 8; 646 if (!spi->max_speed_hz) 647 spi->max_speed_hz = TSC2005_SPI_MAX_SPEED_HZ; 648 649 error = spi_setup(spi); 650 if (error) 651 return error; 652 653 ts = devm_kzalloc(&spi->dev, sizeof(*ts), GFP_KERNEL); 654 if (!ts) 655 return -ENOMEM; 656 657 input_dev = devm_input_allocate_device(&spi->dev); 658 if (!input_dev) 659 return -ENOMEM; 660 661 ts->spi = spi; 662 ts->idev = input_dev; 663 664 ts->x_plate_ohm = x_plate_ohm; 665 ts->esd_timeout = esd_timeout; 666 667 if (np) { 668 ts->reset_gpio = of_get_named_gpio(np, "reset-gpios", 0); 669 if (ts->reset_gpio == -EPROBE_DEFER) 670 return ts->reset_gpio; 671 if (ts->reset_gpio < 0) { 672 dev_err(&spi->dev, "error acquiring reset gpio: %d\n", 673 ts->reset_gpio); 674 return ts->reset_gpio; 675 } 676 677 error = devm_gpio_request_one(&spi->dev, ts->reset_gpio, 0, 678 "reset-gpios"); 679 if (error) { 680 dev_err(&spi->dev, "error requesting reset gpio: %d\n", 681 error); 682 return error; 683 } 684 685 ts->vio = devm_regulator_get(&spi->dev, "vio"); 686 if (IS_ERR(ts->vio)) { 687 error = PTR_ERR(ts->vio); 688 dev_err(&spi->dev, "vio regulator missing (%d)", error); 689 return error; 690 } 691 } else { 692 ts->reset_gpio = -1; 693 ts->set_reset = pdata->set_reset; 694 } 695 696 mutex_init(&ts->mutex); 697 698 spin_lock_init(&ts->lock); 699 setup_timer(&ts->penup_timer, tsc2005_penup_timer, (unsigned long)ts); 700 701 INIT_DELAYED_WORK(&ts->esd_work, tsc2005_esd_work); 702 703 tsc2005_setup_spi_xfer(ts); 704 705 snprintf(ts->phys, sizeof(ts->phys), 706 "%s/input-ts", dev_name(&spi->dev)); 707 708 input_dev->name = "TSC2005 touchscreen"; 709 input_dev->phys = ts->phys; 710 input_dev->id.bustype = BUS_SPI; 711 input_dev->dev.parent = &spi->dev; 712 input_dev->evbit[0] = BIT(EV_ABS) | BIT(EV_KEY); 713 input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH); 714 715 input_set_abs_params(input_dev, ABS_X, 0, max_x, fudge_x, 0); 716 input_set_abs_params(input_dev, ABS_Y, 0, max_y, fudge_y, 0); 717 input_set_abs_params(input_dev, ABS_PRESSURE, 0, max_p, fudge_p, 0); 718 719 if (np) 720 touchscreen_parse_properties(input_dev, false); 721 722 input_dev->open = tsc2005_open; 723 input_dev->close = tsc2005_close; 724 725 input_set_drvdata(input_dev, ts); 726 727 /* Ensure the touchscreen is off */ 728 tsc2005_stop_scan(ts); 729 730 error = devm_request_threaded_irq(&spi->dev, spi->irq, NULL, 731 tsc2005_irq_thread, 732 IRQF_TRIGGER_RISING | IRQF_ONESHOT, 733 "tsc2005", ts); 734 if (error) { 735 dev_err(&spi->dev, "Failed to request irq, err: %d\n", error); 736 return error; 737 } 738 739 /* enable regulator for DT */ 740 if (ts->vio) { 741 error = regulator_enable(ts->vio); 742 if (error) 743 return error; 744 } 745 746 spi_set_drvdata(spi, ts); 747 error = sysfs_create_group(&spi->dev.kobj, &tsc2005_attr_group); 748 if (error) { 749 dev_err(&spi->dev, 750 "Failed to create sysfs attributes, err: %d\n", error); 751 goto disable_regulator; 752 } 753 754 error = input_register_device(ts->idev); 755 if (error) { 756 dev_err(&spi->dev, 757 "Failed to register input device, err: %d\n", error); 758 goto err_remove_sysfs; 759 } 760 761 irq_set_irq_wake(spi->irq, 1); 762 return 0; 763 764 err_remove_sysfs: 765 sysfs_remove_group(&spi->dev.kobj, &tsc2005_attr_group); 766 disable_regulator: 767 if (ts->vio) 768 regulator_disable(ts->vio); 769 return error; 770 } 771 772 static int tsc2005_remove(struct spi_device *spi) 773 { 774 struct tsc2005 *ts = spi_get_drvdata(spi); 775 776 sysfs_remove_group(&spi->dev.kobj, &tsc2005_attr_group); 777 778 if (ts->vio) 779 regulator_disable(ts->vio); 780 781 return 0; 782 } 783 784 static int __maybe_unused tsc2005_suspend(struct device *dev) 785 { 786 struct spi_device *spi = to_spi_device(dev); 787 struct tsc2005 *ts = spi_get_drvdata(spi); 788 789 mutex_lock(&ts->mutex); 790 791 if (!ts->suspended && ts->opened) 792 __tsc2005_disable(ts); 793 794 ts->suspended = true; 795 796 mutex_unlock(&ts->mutex); 797 798 return 0; 799 } 800 801 static int __maybe_unused tsc2005_resume(struct device *dev) 802 { 803 struct spi_device *spi = to_spi_device(dev); 804 struct tsc2005 *ts = spi_get_drvdata(spi); 805 806 mutex_lock(&ts->mutex); 807 808 if (ts->suspended && ts->opened) 809 __tsc2005_enable(ts); 810 811 ts->suspended = false; 812 813 mutex_unlock(&ts->mutex); 814 815 return 0; 816 } 817 818 static SIMPLE_DEV_PM_OPS(tsc2005_pm_ops, tsc2005_suspend, tsc2005_resume); 819 820 static struct spi_driver tsc2005_driver = { 821 .driver = { 822 .name = "tsc2005", 823 .owner = THIS_MODULE, 824 .pm = &tsc2005_pm_ops, 825 }, 826 .probe = tsc2005_probe, 827 .remove = tsc2005_remove, 828 }; 829 830 module_spi_driver(tsc2005_driver); 831 832 MODULE_AUTHOR("Lauri Leukkunen <lauri.leukkunen@nokia.com>"); 833 MODULE_DESCRIPTION("TSC2005 Touchscreen Driver"); 834 MODULE_LICENSE("GPL"); 835 MODULE_ALIAS("spi:tsc2005"); 836