drivers/input/touchscreen/tsc2005.c

   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
 115 struct tsc2005_spi_rd {
 116         struct spi_transfer     spi_xfer;
 117         u32                     spi_tx;
 118         u32                     spi_rx;
 119 };
 120
 121 struct 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
 161 static 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
 185 static 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
 210 static 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
 222 static 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
 241 static 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
 264 static 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;
 325 out:
 326         return IRQ_HANDLED;
 327 }
 328
 329 static 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
 339 static 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
 347 static void tsc2005_stop_scan(struct tsc2005 *ts)
 348 {
 349         tsc2005_cmd(ts, TSC2005_CMD_STOP);
 350 }
 351
 352 static 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 */
 361 static 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 */
 374 static 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
 387 static 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
 459 out:
 460         __tsc2005_enable(ts);
 461         mutex_unlock(&ts->mutex);
 462
 463         return sprintf(buf, "%d\n", success);
 464 }
 465
 466 static DEVICE_ATTR(selftest, S_IRUGO, tsc2005_selftest_show, NULL);
 467
 468 static struct attribute *tsc2005_attrs[] = {
 469         &dev_attr_selftest.attr,
 470         NULL
 471 };
 472
 473 static 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
 489 static const struct attribute_group tsc2005_attr_group = {
 490         .is_visible     = tsc2005_attr_is_visible,
 491         .attrs          = tsc2005_attrs,
 492 };
 493
 494 static 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
 539 out:
 540         mutex_unlock(&ts->mutex);
 541 reschedule:
 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
 548 static 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
 564 static 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
 578 static 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
 592 static 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_properties(input_dev, false);
 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
 756 err_remove_sysfs:
 757         sysfs_remove_group(&spi->dev.kobj, &tsc2005_attr_group);
 758 disable_regulator:
 759         if (ts->vio)
 760                 regulator_disable(ts->vio);
 761         return error;
 762 }
 763
 764 static 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
 776 static 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
 793 static 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
 810 static SIMPLE_DEV_PM_OPS(tsc2005_pm_ops, tsc2005_suspend, tsc2005_resume);
 811
 812 static 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
 822 module_spi_driver(tsc2005_driver);
 823
 824 MODULE_AUTHOR("Lauri Leukkunen <lauri.leukkunen@nokia.com>");
 825 MODULE_DESCRIPTION("TSC2005 Touchscreen Driver");
 826 MODULE_LICENSE("GPL");
 827 MODULE_ALIAS("spi:tsc2005");