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 0x0001 65#define TSC2005_REG_PND0 0x0002 66#define TSC2005_REG_X 0x0000 67#define TSC2005_REG_Y 0x0008 68#define TSC2005_REG_Z1 0x0010 69#define TSC2005_REG_Z2 0x0018 70#define TSC2005_REG_TEMP_HIGH 0x0050 71#define TSC2005_REG_CFR0 0x0060 72#define TSC2005_REG_CFR1 0x0068 73#define TSC2005_REG_CFR2 0x0070 74 75/* configuration register 0 */ 76#define TSC2005_CFR0_PRECHARGE_276US 0x0040 77#define TSC2005_CFR0_STABTIME_1MS 0x0300 78#define TSC2005_CFR0_CLOCK_1MHZ 0x1000 79#define TSC2005_CFR0_RESOLUTION12 0x2000 80#define TSC2005_CFR0_PENMODE 0x8000 81#define TSC2005_CFR0_INITVALUE (TSC2005_CFR0_STABTIME_1MS | \ 82 TSC2005_CFR0_CLOCK_1MHZ | \ 83 TSC2005_CFR0_RESOLUTION12 | \ 84 TSC2005_CFR0_PRECHARGE_276US | \ 85 TSC2005_CFR0_PENMODE) 86 87/* bits common to both read and write of configuration register 0 */ 88#define TSC2005_CFR0_RW_MASK 0x3fff 89 90/* configuration register 1 */ 91#define TSC2005_CFR1_BATCHDELAY_4MS 0x0003 92#define TSC2005_CFR1_INITVALUE TSC2005_CFR1_BATCHDELAY_4MS 93 94/* configuration register 2 */ 95#define TSC2005_CFR2_MAVE_Z 0x0004 96#define TSC2005_CFR2_MAVE_Y 0x0008 97#define TSC2005_CFR2_MAVE_X 0x0010 98#define TSC2005_CFR2_AVG_7 0x0800 99#define TSC2005_CFR2_MEDIUM_15 0x3000 100#define TSC2005_CFR2_INITVALUE (TSC2005_CFR2_MAVE_X | \ 101 TSC2005_CFR2_MAVE_Y | \ 102 TSC2005_CFR2_MAVE_Z | \ 103 TSC2005_CFR2_MEDIUM_15 | \ 104 TSC2005_CFR2_AVG_7) 105 106#define MAX_12BIT 0xfff 107#define TSC2005_DEF_X_FUZZ 4 108#define TSC2005_DEF_Y_FUZZ 8 109#define TSC2005_DEF_P_FUZZ 2 110#define TSC2005_DEF_RESISTOR 280 111 112#define TSC2005_SPI_MAX_SPEED_HZ 10000000 113#define TSC2005_PENUP_TIME_MS 40 114 115struct tsc2005_spi_rd { 116 struct spi_transfer spi_xfer; 117 u32 spi_tx; 118 u32 spi_rx; 119}; 120 121struct tsc2005 { 122 struct spi_device *spi; 123 124 struct spi_message spi_read_msg; 125 struct tsc2005_spi_rd spi_x; 126 struct tsc2005_spi_rd spi_y; 127 struct tsc2005_spi_rd spi_z1; 128 struct tsc2005_spi_rd spi_z2; 129 130 struct input_dev *idev; 131 char phys[32]; 132 133 struct mutex mutex; 134 135 /* raw copy of previous x,y,z */ 136 int in_x; 137 int in_y; 138 int in_z1; 139 int in_z2; 140 141 spinlock_t lock; 142 struct timer_list penup_timer; 143 144 unsigned int esd_timeout; 145 struct delayed_work esd_work; 146 unsigned long last_valid_interrupt; 147 148 unsigned int x_plate_ohm; 149 150 bool opened; 151 bool suspended; 152 153 bool pen_down; 154 155 struct regulator *vio; 156 157 int reset_gpio; 158 void (*set_reset)(bool enable); 159}; 160 161static int tsc2005_cmd(struct tsc2005 *ts, u8 cmd) 162{ 163 u8 tx = TSC2005_CMD | TSC2005_CMD_12BIT | cmd; 164 struct spi_transfer xfer = { 165 .tx_buf = &tx, 166 .len = 1, 167 .bits_per_word = 8, 168 }; 169 struct spi_message msg; 170 int error; 171 172 spi_message_init(&msg); 173 spi_message_add_tail(&xfer, &msg); 174 175 error = spi_sync(ts->spi, &msg); 176 if (error) { 177 dev_err(&ts->spi->dev, "%s: failed, command: %x, error: %d\n", 178 __func__, cmd, error); 179 return error; 180 } 181 182 return 0; 183} 184 185static int tsc2005_write(struct tsc2005 *ts, u8 reg, u16 value) 186{ 187 u32 tx = ((reg | TSC2005_REG_PND0) << 16) | value; 188 struct spi_transfer xfer = { 189 .tx_buf = &tx, 190 .len = 4, 191 .bits_per_word = 24, 192 }; 193 struct spi_message msg; 194 int error; 195 196 spi_message_init(&msg); 197 spi_message_add_tail(&xfer, &msg); 198 199 error = spi_sync(ts->spi, &msg); 200 if (error) { 201 dev_err(&ts->spi->dev, 202 "%s: failed, register: %x, value: %x, error: %d\n", 203 __func__, reg, value, error); 204 return error; 205 } 206 207 return 0; 208} 209 210static void tsc2005_setup_read(struct tsc2005_spi_rd *rd, u8 reg, bool last) 211{ 212 memset(rd, 0, sizeof(*rd)); 213 214 rd->spi_tx = (reg | TSC2005_REG_READ) << 16; 215 rd->spi_xfer.tx_buf = &rd->spi_tx; 216 rd->spi_xfer.rx_buf = &rd->spi_rx; 217 rd->spi_xfer.len = 4; 218 rd->spi_xfer.bits_per_word = 24; 219 rd->spi_xfer.cs_change = !last; 220} 221 222static int tsc2005_read(struct tsc2005 *ts, u8 reg, u16 *value) 223{ 224 struct tsc2005_spi_rd spi_rd; 225 struct spi_message msg; 226 int error; 227 228 tsc2005_setup_read(&spi_rd, reg, true); 229 230 spi_message_init(&msg); 231 spi_message_add_tail(&spi_rd.spi_xfer, &msg); 232 233 error = spi_sync(ts->spi, &msg); 234 if (error) 235 return error; 236 237 *value = spi_rd.spi_rx; 238 return 0; 239} 240 241static void tsc2005_update_pen_state(struct tsc2005 *ts, 242 int x, int y, int pressure) 243{ 244 if (pressure) { 245 input_report_abs(ts->idev, ABS_X, x); 246 input_report_abs(ts->idev, ABS_Y, y); 247 input_report_abs(ts->idev, ABS_PRESSURE, pressure); 248 if (!ts->pen_down) { 249 input_report_key(ts->idev, BTN_TOUCH, !!pressure); 250 ts->pen_down = true; 251 } 252 } else { 253 input_report_abs(ts->idev, ABS_PRESSURE, 0); 254 if (ts->pen_down) { 255 input_report_key(ts->idev, BTN_TOUCH, 0); 256 ts->pen_down = false; 257 } 258 } 259 input_sync(ts->idev); 260 dev_dbg(&ts->spi->dev, "point(%4d,%4d), pressure (%4d)\n", x, y, 261 pressure); 262} 263 264static irqreturn_t tsc2005_irq_thread(int irq, void *_ts) 265{ 266 struct tsc2005 *ts = _ts; 267 unsigned long flags; 268 unsigned int pressure; 269 u32 x, y; 270 u32 z1, z2; 271 int error; 272 273 /* read the coordinates */ 274 error = spi_sync(ts->spi, &ts->spi_read_msg); 275 if (unlikely(error)) 276 goto out; 277 278 x = ts->spi_x.spi_rx; 279 y = ts->spi_y.spi_rx; 280 z1 = ts->spi_z1.spi_rx; 281 z2 = ts->spi_z2.spi_rx; 282 283 /* validate position */ 284 if (unlikely(x > MAX_12BIT || y > MAX_12BIT)) 285 goto out; 286 287 /* Skip reading if the pressure components are out of range */ 288 if (unlikely(z1 == 0 || z2 > MAX_12BIT || z1 >= z2)) 289 goto out; 290 291 /* 292 * Skip point if this is a pen down with the exact same values as 293 * the value before pen-up - that implies SPI fed us stale data 294 */ 295 if (!ts->pen_down && 296 ts->in_x == x && ts->in_y == y && 297 ts->in_z1 == z1 && ts->in_z2 == z2) { 298 goto out; 299 } 300 301 /* 302 * At this point we are happy we have a valid and useful reading. 303 * Remember it for later comparisons. We may now begin downsampling. 304 */ 305 ts->in_x = x; 306 ts->in_y = y; 307 ts->in_z1 = z1; 308 ts->in_z2 = z2; 309 310 /* Compute touch pressure resistance using equation #1 */ 311 pressure = x * (z2 - z1) / z1; 312 pressure = pressure * ts->x_plate_ohm / 4096; 313 if (unlikely(pressure > MAX_12BIT)) 314 goto out; 315 316 spin_lock_irqsave(&ts->lock, flags); 317 318 tsc2005_update_pen_state(ts, x, y, pressure); 319 mod_timer(&ts->penup_timer, 320 jiffies + msecs_to_jiffies(TSC2005_PENUP_TIME_MS)); 321 322 spin_unlock_irqrestore(&ts->lock, flags); 323 324 ts->last_valid_interrupt = jiffies; 325out: 326 return IRQ_HANDLED; 327} 328 329static void tsc2005_penup_timer(unsigned long data) 330{ 331 struct tsc2005 *ts = (struct tsc2005 *)data; 332 unsigned long flags; 333 334 spin_lock_irqsave(&ts->lock, flags); 335 tsc2005_update_pen_state(ts, 0, 0, 0); 336 spin_unlock_irqrestore(&ts->lock, flags); 337} 338 339static void tsc2005_start_scan(struct tsc2005 *ts) 340{ 341 tsc2005_write(ts, TSC2005_REG_CFR0, TSC2005_CFR0_INITVALUE); 342 tsc2005_write(ts, TSC2005_REG_CFR1, TSC2005_CFR1_INITVALUE); 343 tsc2005_write(ts, TSC2005_REG_CFR2, TSC2005_CFR2_INITVALUE); 344 tsc2005_cmd(ts, TSC2005_CMD_NORMAL); 345} 346 347static void tsc2005_stop_scan(struct tsc2005 *ts) 348{ 349 tsc2005_cmd(ts, TSC2005_CMD_STOP); 350} 351 352static void tsc2005_set_reset(struct tsc2005 *ts, bool enable) 353{ 354 if (ts->reset_gpio >= 0) 355 gpio_set_value(ts->reset_gpio, enable); 356 else if (ts->set_reset) 357 ts->set_reset(enable); 358} 359 360/* must be called with ts->mutex held */ 361static void __tsc2005_disable(struct tsc2005 *ts) 362{ 363 tsc2005_stop_scan(ts); 364 365 disable_irq(ts->spi->irq); 366 del_timer_sync(&ts->penup_timer); 367 368 cancel_delayed_work_sync(&ts->esd_work); 369 370 enable_irq(ts->spi->irq); 371} 372 373/* must be called with ts->mutex held */ 374static void __tsc2005_enable(struct tsc2005 *ts) 375{ 376 tsc2005_start_scan(ts); 377 378 if (ts->esd_timeout && (ts->set_reset || ts->reset_gpio)) { 379 ts->last_valid_interrupt = jiffies; 380 schedule_delayed_work(&ts->esd_work, 381 round_jiffies_relative( 382 msecs_to_jiffies(ts->esd_timeout))); 383 } 384 385} 386 387static ssize_t tsc2005_selftest_show(struct device *dev, 388 struct device_attribute *attr, 389 char *buf) 390{ 391 struct spi_device *spi = to_spi_device(dev); 392 struct tsc2005 *ts = spi_get_drvdata(spi); 393 u16 temp_high; 394 u16 temp_high_orig; 395 u16 temp_high_test; 396 bool success = true; 397 int error; 398 399 mutex_lock(&ts->mutex); 400 401 /* 402 * Test TSC2005 communications via temp high register. 403 */ 404 __tsc2005_disable(ts); 405 406 error = tsc2005_read(ts, TSC2005_REG_TEMP_HIGH, &temp_high_orig); 407 if (error) { 408 dev_warn(dev, "selftest failed: read error %d\n", error); 409 success = false; 410 goto out; 411 } 412 413 temp_high_test = (temp_high_orig - 1) & MAX_12BIT; 414 415 error = tsc2005_write(ts, TSC2005_REG_TEMP_HIGH, temp_high_test); 416 if (error) { 417 dev_warn(dev, "selftest failed: write error %d\n", error); 418 success = false; 419 goto out; 420 } 421 422 error = tsc2005_read(ts, TSC2005_REG_TEMP_HIGH, &temp_high); 423 if (error) { 424 dev_warn(dev, "selftest failed: read error %d after write\n", 425 error); 426 success = false; 427 goto out; 428 } 429 430 if (temp_high != temp_high_test) { 431 dev_warn(dev, "selftest failed: %d != %d\n", 432 temp_high, temp_high_test); 433 success = false; 434 } 435 436 /* hardware reset */ 437 tsc2005_set_reset(ts, false); 438 usleep_range(100, 500); /* only 10us required */ 439 tsc2005_set_reset(ts, true); 440 441 if (!success) 442 goto out; 443 444 /* test that the reset really happened */ 445 error = tsc2005_read(ts, TSC2005_REG_TEMP_HIGH, &temp_high); 446 if (error) { 447 dev_warn(dev, "selftest failed: read error %d after reset\n", 448 error); 449 success = false; 450 goto out; 451 } 452 453 if (temp_high != temp_high_orig) { 454 dev_warn(dev, "selftest failed after reset: %d != %d\n", 455 temp_high, temp_high_orig); 456 success = false; 457 } 458 459out: 460 __tsc2005_enable(ts); 461 mutex_unlock(&ts->mutex); 462 463 return sprintf(buf, "%d\n", success); 464} 465 466static DEVICE_ATTR(selftest, S_IRUGO, tsc2005_selftest_show, NULL); 467 468static struct attribute *tsc2005_attrs[] = { 469 &dev_attr_selftest.attr, 470 NULL 471}; 472 473static umode_t tsc2005_attr_is_visible(struct kobject *kobj, 474 struct attribute *attr, int n) 475{ 476 struct device *dev = container_of(kobj, struct device, kobj); 477 struct spi_device *spi = to_spi_device(dev); 478 struct tsc2005 *ts = spi_get_drvdata(spi); 479 umode_t mode = attr->mode; 480 481 if (attr == &dev_attr_selftest.attr) { 482 if (!ts->set_reset && !ts->reset_gpio) 483 mode = 0; 484 } 485 486 return mode; 487} 488 489static const struct attribute_group tsc2005_attr_group = { 490 .is_visible = tsc2005_attr_is_visible, 491 .attrs = tsc2005_attrs, 492}; 493 494static void tsc2005_esd_work(struct work_struct *work) 495{ 496 struct tsc2005 *ts = container_of(work, struct tsc2005, esd_work.work); 497 int error; 498 u16 r; 499 500 if (!mutex_trylock(&ts->mutex)) { 501 /* 502 * If the mutex is taken, it means that disable or enable is in 503 * progress. In that case just reschedule the work. If the work 504 * is not needed, it will be canceled by disable. 505 */ 506 goto reschedule; 507 } 508 509 if (time_is_after_jiffies(ts->last_valid_interrupt + 510 msecs_to_jiffies(ts->esd_timeout))) 511 goto out; 512 513 /* We should be able to read register without disabling interrupts. */ 514 error = tsc2005_read(ts, TSC2005_REG_CFR0, &r); 515 if (!error && 516 !((r ^ TSC2005_CFR0_INITVALUE) & TSC2005_CFR0_RW_MASK)) { 517 goto out; 518 } 519 520 /* 521 * If we could not read our known value from configuration register 0 522 * then we should reset the controller as if from power-up and start 523 * scanning again. 524 */ 525 dev_info(&ts->spi->dev, "TSC2005 not responding - resetting\n"); 526 527 disable_irq(ts->spi->irq); 528 del_timer_sync(&ts->penup_timer); 529 530 tsc2005_update_pen_state(ts, 0, 0, 0); 531 532 tsc2005_set_reset(ts, false); 533 usleep_range(100, 500); /* only 10us required */ 534 tsc2005_set_reset(ts, true); 535 536 enable_irq(ts->spi->irq); 537 tsc2005_start_scan(ts); 538 539out: 540 mutex_unlock(&ts->mutex); 541reschedule: 542 /* re-arm the watchdog */ 543 schedule_delayed_work(&ts->esd_work, 544 round_jiffies_relative( 545 msecs_to_jiffies(ts->esd_timeout))); 546} 547 548static int tsc2005_open(struct input_dev *input) 549{ 550 struct tsc2005 *ts = input_get_drvdata(input); 551 552 mutex_lock(&ts->mutex); 553 554 if (!ts->suspended) 555 __tsc2005_enable(ts); 556 557 ts->opened = true; 558 559 mutex_unlock(&ts->mutex); 560 561 return 0; 562} 563 564static void tsc2005_close(struct input_dev *input) 565{ 566 struct tsc2005 *ts = input_get_drvdata(input); 567 568 mutex_lock(&ts->mutex); 569 570 if (!ts->suspended) 571 __tsc2005_disable(ts); 572 573 ts->opened = false; 574 575 mutex_unlock(&ts->mutex); 576} 577 578static void tsc2005_setup_spi_xfer(struct tsc2005 *ts) 579{ 580 tsc2005_setup_read(&ts->spi_x, TSC2005_REG_X, false); 581 tsc2005_setup_read(&ts->spi_y, TSC2005_REG_Y, false); 582 tsc2005_setup_read(&ts->spi_z1, TSC2005_REG_Z1, false); 583 tsc2005_setup_read(&ts->spi_z2, TSC2005_REG_Z2, true); 584 585 spi_message_init(&ts->spi_read_msg); 586 spi_message_add_tail(&ts->spi_x.spi_xfer, &ts->spi_read_msg); 587 spi_message_add_tail(&ts->spi_y.spi_xfer, &ts->spi_read_msg); 588 spi_message_add_tail(&ts->spi_z1.spi_xfer, &ts->spi_read_msg); 589 spi_message_add_tail(&ts->spi_z2.spi_xfer, &ts->spi_read_msg); 590} 591 592static int tsc2005_probe(struct spi_device *spi) 593{ 594 const struct tsc2005_platform_data *pdata = dev_get_platdata(&spi->dev); 595 struct device_node *np = spi->dev.of_node; 596 597 struct tsc2005 *ts; 598 struct input_dev *input_dev; 599 unsigned int max_x = MAX_12BIT; 600 unsigned int max_y = MAX_12BIT; 601 unsigned int max_p = MAX_12BIT; 602 unsigned int fudge_x = TSC2005_DEF_X_FUZZ; 603 unsigned int fudge_y = TSC2005_DEF_Y_FUZZ; 604 unsigned int fudge_p = TSC2005_DEF_P_FUZZ; 605 unsigned int x_plate_ohm = TSC2005_DEF_RESISTOR; 606 unsigned int esd_timeout; 607 int error; 608 609 if (!np && !pdata) { 610 dev_err(&spi->dev, "no platform data\n"); 611 return -ENODEV; 612 } 613 614 if (spi->irq <= 0) { 615 dev_err(&spi->dev, "no irq\n"); 616 return -ENODEV; 617 } 618 619 if (pdata) { 620 fudge_x = pdata->ts_x_fudge; 621 fudge_y = pdata->ts_y_fudge; 622 fudge_p = pdata->ts_pressure_fudge; 623 max_x = pdata->ts_x_max; 624 max_y = pdata->ts_y_max; 625 max_p = pdata->ts_pressure_max; 626 x_plate_ohm = pdata->ts_x_plate_ohm; 627 esd_timeout = pdata->esd_timeout_ms; 628 } else { 629 x_plate_ohm = TSC2005_DEF_RESISTOR; 630 of_property_read_u32(np, "ti,x-plate-ohms", &x_plate_ohm); 631 esd_timeout = 0; 632 of_property_read_u32(np, "ti,esd-recovery-timeout-ms", 633 &esd_timeout); 634 } 635 636 spi->mode = SPI_MODE_0; 637 spi->bits_per_word = 8; 638 if (!spi->max_speed_hz) 639 spi->max_speed_hz = TSC2005_SPI_MAX_SPEED_HZ; 640 641 error = spi_setup(spi); 642 if (error) 643 return error; 644 645 ts = devm_kzalloc(&spi->dev, sizeof(*ts), GFP_KERNEL); 646 if (!ts) 647 return -ENOMEM; 648 649 input_dev = devm_input_allocate_device(&spi->dev); 650 if (!input_dev) 651 return -ENOMEM; 652 653 ts->spi = spi; 654 ts->idev = input_dev; 655 656 ts->x_plate_ohm = x_plate_ohm; 657 ts->esd_timeout = esd_timeout; 658 659 if (np) { 660 ts->reset_gpio = of_get_named_gpio(np, "reset-gpios", 0); 661 if (ts->reset_gpio == -EPROBE_DEFER) 662 return ts->reset_gpio; 663 if (ts->reset_gpio < 0) { 664 dev_err(&spi->dev, "error acquiring reset gpio: %d\n", 665 ts->reset_gpio); 666 return ts->reset_gpio; 667 } 668 669 error = devm_gpio_request_one(&spi->dev, ts->reset_gpio, 0, 670 "reset-gpios"); 671 if (error) { 672 dev_err(&spi->dev, "error requesting reset gpio: %d\n", 673 error); 674 return error; 675 } 676 677 ts->vio = devm_regulator_get(&spi->dev, "vio"); 678 if (IS_ERR(ts->vio)) { 679 error = PTR_ERR(ts->vio); 680 dev_err(&spi->dev, "vio regulator missing (%d)", error); 681 return error; 682 } 683 } else { 684 ts->reset_gpio = -1; 685 ts->set_reset = pdata->set_reset; 686 } 687 688 mutex_init(&ts->mutex); 689 690 spin_lock_init(&ts->lock); 691 setup_timer(&ts->penup_timer, tsc2005_penup_timer, (unsigned long)ts); 692 693 INIT_DELAYED_WORK(&ts->esd_work, tsc2005_esd_work); 694 695 tsc2005_setup_spi_xfer(ts); 696 697 snprintf(ts->phys, sizeof(ts->phys), 698 "%s/input-ts", dev_name(&spi->dev)); 699 700 input_dev->name = "TSC2005 touchscreen"; 701 input_dev->phys = ts->phys; 702 input_dev->id.bustype = BUS_SPI; 703 input_dev->dev.parent = &spi->dev; 704 input_dev->evbit[0] = BIT(EV_ABS) | BIT(EV_KEY); 705 input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH); 706 707 input_set_abs_params(input_dev, ABS_X, 0, max_x, fudge_x, 0); 708 input_set_abs_params(input_dev, ABS_Y, 0, max_y, fudge_y, 0); 709 input_set_abs_params(input_dev, ABS_PRESSURE, 0, max_p, fudge_p, 0); 710 711 if (np) 712 touchscreen_parse_of_params(input_dev); 713 714 input_dev->open = tsc2005_open; 715 input_dev->close = tsc2005_close; 716 717 input_set_drvdata(input_dev, ts); 718 719 /* Ensure the touchscreen is off */ 720 tsc2005_stop_scan(ts); 721 722 error = devm_request_threaded_irq(&spi->dev, spi->irq, NULL, 723 tsc2005_irq_thread, 724 IRQF_TRIGGER_RISING | IRQF_ONESHOT, 725 "tsc2005", ts); 726 if (error) { 727 dev_err(&spi->dev, "Failed to request irq, err: %d\n", error); 728 return error; 729 } 730 731 /* enable regulator for DT */ 732 if (ts->vio) { 733 error = regulator_enable(ts->vio); 734 if (error) 735 return error; 736 } 737 738 spi_set_drvdata(spi, ts); 739 error = sysfs_create_group(&spi->dev.kobj, &tsc2005_attr_group); 740 if (error) { 741 dev_err(&spi->dev, 742 "Failed to create sysfs attributes, err: %d\n", error); 743 goto disable_regulator; 744 } 745 746 error = input_register_device(ts->idev); 747 if (error) { 748 dev_err(&spi->dev, 749 "Failed to register input device, err: %d\n", error); 750 goto err_remove_sysfs; 751 } 752 753 irq_set_irq_wake(spi->irq, 1); 754 return 0; 755 756err_remove_sysfs: 757 sysfs_remove_group(&spi->dev.kobj, &tsc2005_attr_group); 758disable_regulator: 759 if (ts->vio) 760 regulator_disable(ts->vio); 761 return error; 762} 763 764static int tsc2005_remove(struct spi_device *spi) 765{ 766 struct tsc2005 *ts = spi_get_drvdata(spi); 767 768 sysfs_remove_group(&spi->dev.kobj, &tsc2005_attr_group); 769 770 if (ts->vio) 771 regulator_disable(ts->vio); 772 773 return 0; 774} 775 776static int __maybe_unused tsc2005_suspend(struct device *dev) 777{ 778 struct spi_device *spi = to_spi_device(dev); 779 struct tsc2005 *ts = spi_get_drvdata(spi); 780 781 mutex_lock(&ts->mutex); 782 783 if (!ts->suspended && ts->opened) 784 __tsc2005_disable(ts); 785 786 ts->suspended = true; 787 788 mutex_unlock(&ts->mutex); 789 790 return 0; 791} 792 793static int __maybe_unused tsc2005_resume(struct device *dev) 794{ 795 struct spi_device *spi = to_spi_device(dev); 796 struct tsc2005 *ts = spi_get_drvdata(spi); 797 798 mutex_lock(&ts->mutex); 799 800 if (ts->suspended && ts->opened) 801 __tsc2005_enable(ts); 802 803 ts->suspended = false; 804 805 mutex_unlock(&ts->mutex); 806 807 return 0; 808} 809 810static SIMPLE_DEV_PM_OPS(tsc2005_pm_ops, tsc2005_suspend, tsc2005_resume); 811 812static struct spi_driver tsc2005_driver = { 813 .driver = { 814 .name = "tsc2005", 815 .owner = THIS_MODULE, 816 .pm = &tsc2005_pm_ops, 817 }, 818 .probe = tsc2005_probe, 819 .remove = tsc2005_remove, 820}; 821 822module_spi_driver(tsc2005_driver); 823 824MODULE_AUTHOR("Lauri Leukkunen <lauri.leukkunen@nokia.com>"); 825MODULE_DESCRIPTION("TSC2005 Touchscreen Driver"); 826MODULE_LICENSE("GPL"); 827MODULE_ALIAS("spi:tsc2005"); 828