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/interrupt.h>
  29 #include <linux/delay.h>
  30 #include <linux/pm.h>
  31 #include <linux/spi/spi.h>
  32 #include <linux/spi/tsc2005.h>
  33
  34 /*
  35  * The touchscreen interface operates as follows:
  36  *
  37  * 1) Pen is pressed against the touchscreen.
  38  * 2) TSC2005 performs AD conversion.
  39  * 3) After the conversion is done TSC2005 drives DAV line down.
  40  * 4) GPIO IRQ is received and tsc2005_irq_thread() is scheduled.
  41  * 5) tsc2005_irq_thread() queues up an spi transfer to fetch the x, y, z1, z2
  42  *    values.
  43  * 6) tsc2005_irq_thread() reports coordinates to input layer and sets up
  44  *    tsc2005_penup_timer() to be called after TSC2005_PENUP_TIME_MS (40ms).
  45  * 7) When the penup timer expires, there have not been touch or DAV interrupts
  46  *    during the last 40ms which means the pen has been lifted.
  47  *
  48  * ESD recovery via a hardware reset is done if the TSC2005 doesn't respond
  49  * after a configurable period (in ms) of activity. If esd_timeout is 0, the
  50  * watchdog is disabled.
  51  */
  52
  53 /* control byte 1 */
  54 #define TSC2005_CMD                     0x80
  55 #define TSC2005_CMD_NORMAL              0x00
  56 #define TSC2005_CMD_STOP                0x01
  57 #define TSC2005_CMD_12BIT               0x04
  58
  59 /* control byte 0 */
  60 #define TSC2005_REG_READ                0x0001
  61 #define TSC2005_REG_PND0                0x0002
  62 #define TSC2005_REG_X                   0x0000
  63 #define TSC2005_REG_Y                   0x0008
  64 #define TSC2005_REG_Z1                  0x0010
  65 #define TSC2005_REG_Z2                  0x0018
  66 #define TSC2005_REG_TEMP_HIGH           0x0050
  67 #define TSC2005_REG_CFR0                0x0060
  68 #define TSC2005_REG_CFR1                0x0068
  69 #define TSC2005_REG_CFR2                0x0070
  70
  71 /* configuration register 0 */
  72 #define TSC2005_CFR0_PRECHARGE_276US    0x0040
  73 #define TSC2005_CFR0_STABTIME_1MS       0x0300
  74 #define TSC2005_CFR0_CLOCK_1MHZ         0x1000
  75 #define TSC2005_CFR0_RESOLUTION12       0x2000
  76 #define TSC2005_CFR0_PENMODE            0x8000
  77 #define TSC2005_CFR0_INITVALUE          (TSC2005_CFR0_STABTIME_1MS    | \
  78                                          TSC2005_CFR0_CLOCK_1MHZ      | \
  79                                          TSC2005_CFR0_RESOLUTION12    | \
  80                                          TSC2005_CFR0_PRECHARGE_276US | \
  81                                          TSC2005_CFR0_PENMODE)
  82
  83 /* bits common to both read and write of configuration register 0 */
  84 #define TSC2005_CFR0_RW_MASK            0x3fff
  85
  86 /* configuration register 1 */
  87 #define TSC2005_CFR1_BATCHDELAY_4MS     0x0003
  88 #define TSC2005_CFR1_INITVALUE          TSC2005_CFR1_BATCHDELAY_4MS
  89
  90 /* configuration register 2 */
  91 #define TSC2005_CFR2_MAVE_Z             0x0004
  92 #define TSC2005_CFR2_MAVE_Y             0x0008
  93 #define TSC2005_CFR2_MAVE_X             0x0010
  94 #define TSC2005_CFR2_AVG_7              0x0800
  95 #define TSC2005_CFR2_MEDIUM_15          0x3000
  96 #define TSC2005_CFR2_INITVALUE          (TSC2005_CFR2_MAVE_X    | \
  97                                          TSC2005_CFR2_MAVE_Y    | \
  98                                          TSC2005_CFR2_MAVE_Z    | \
  99                                          TSC2005_CFR2_MEDIUM_15 | \
 100                                          TSC2005_CFR2_AVG_7)
 101
 102 #define MAX_12BIT                       0xfff
 103 #define TSC2005_SPI_MAX_SPEED_HZ        10000000
 104 #define TSC2005_PENUP_TIME_MS           40
 105
 106 struct tsc2005_spi_rd {
 107         struct spi_transfer     spi_xfer;
 108         u32                     spi_tx;
 109         u32                     spi_rx;
 110 };
 111
 112 struct tsc2005 {
 113         struct spi_device       *spi;
 114
 115         struct spi_message      spi_read_msg;
 116         struct tsc2005_spi_rd   spi_x;
 117         struct tsc2005_spi_rd   spi_y;
 118         struct tsc2005_spi_rd   spi_z1;
 119         struct tsc2005_spi_rd   spi_z2;
 120
 121         struct input_dev        *idev;
 122         char                    phys[32];
 123
 124         struct mutex            mutex;
 125
 126         /* raw copy of previous x,y,z */
 127         int                     in_x;
 128         int                     in_y;
 129         int                     in_z1;
 130         int                     in_z2;
 131
 132         spinlock_t              lock;
 133         struct timer_list       penup_timer;
 134
 135         unsigned int            esd_timeout;
 136         struct delayed_work     esd_work;
 137         unsigned long           last_valid_interrupt;
 138
 139         unsigned int            x_plate_ohm;
 140
 141         bool                    opened;
 142         bool                    suspended;
 143
 144         bool                    pen_down;
 145
 146         void                    (*set_reset)(bool enable);
 147 };
 148
 149 static int tsc2005_cmd(struct tsc2005 *ts, u8 cmd)
 150 {
 151         u8 tx = TSC2005_CMD | TSC2005_CMD_12BIT | cmd;
 152         struct spi_transfer xfer = {
 153                 .tx_buf         = &tx,
 154                 .len            = 1,
 155                 .bits_per_word  = 8,
 156         };
 157         struct spi_message msg;
 158         int error;
 159
 160         spi_message_init(&msg);
 161         spi_message_add_tail(&xfer, &msg);
 162
 163         error = spi_sync(ts->spi, &msg);
 164         if (error) {
 165                 dev_err(&ts->spi->dev, "%s: failed, command: %x, error: %d\n",
 166                         __func__, cmd, error);
 167                 return error;
 168         }
 169
 170         return 0;
 171 }
 172
 173 static int tsc2005_write(struct tsc2005 *ts, u8 reg, u16 value)
 174 {
 175         u32 tx = ((reg | TSC2005_REG_PND0) << 16) | value;
 176         struct spi_transfer xfer = {
 177                 .tx_buf         = &tx,
 178                 .len            = 4,
 179                 .bits_per_word  = 24,
 180         };
 181         struct spi_message msg;
 182         int error;
 183
 184         spi_message_init(&msg);
 185         spi_message_add_tail(&xfer, &msg);
 186
 187         error = spi_sync(ts->spi, &msg);
 188         if (error) {
 189                 dev_err(&ts->spi->dev,
 190                         "%s: failed, register: %x, value: %x, error: %d\n",
 191                         __func__, reg, value, error);
 192                 return error;
 193         }
 194
 195         return 0;
 196 }
 197
 198 static void tsc2005_setup_read(struct tsc2005_spi_rd *rd, u8 reg, bool last)
 199 {
 200         memset(rd, 0, sizeof(*rd));
 201
 202         rd->spi_tx                 = (reg | TSC2005_REG_READ) << 16;
 203         rd->spi_xfer.tx_buf        = &rd->spi_tx;
 204         rd->spi_xfer.rx_buf        = &rd->spi_rx;
 205         rd->spi_xfer.len           = 4;
 206         rd->spi_xfer.bits_per_word = 24;
 207         rd->spi_xfer.cs_change     = !last;
 208 }
 209
 210 static int tsc2005_read(struct tsc2005 *ts, u8 reg, u16 *value)
 211 {
 212         struct tsc2005_spi_rd spi_rd;
 213         struct spi_message msg;
 214         int error;
 215
 216         tsc2005_setup_read(&spi_rd, reg, true);
 217
 218         spi_message_init(&msg);
 219         spi_message_add_tail(&spi_rd.spi_xfer, &msg);
 220
 221         error = spi_sync(ts->spi, &msg);
 222         if (error)
 223                 return error;
 224
 225         *value = spi_rd.spi_rx;
 226         return 0;
 227 }
 228
 229 static void tsc2005_update_pen_state(struct tsc2005 *ts,
 230                                      int x, int y, int pressure)
 231 {
 232         if (pressure) {
 233                 input_report_abs(ts->idev, ABS_X, x);
 234                 input_report_abs(ts->idev, ABS_Y, y);
 235                 input_report_abs(ts->idev, ABS_PRESSURE, pressure);
 236                 if (!ts->pen_down) {
 237                         input_report_key(ts->idev, BTN_TOUCH, !!pressure);
 238                         ts->pen_down = true;
 239                 }
 240         } else {
 241                 input_report_abs(ts->idev, ABS_PRESSURE, 0);
 242                 if (ts->pen_down) {
 243                         input_report_key(ts->idev, BTN_TOUCH, 0);
 244                         ts->pen_down = false;
 245                 }
 246         }
 247         input_sync(ts->idev);
 248         dev_dbg(&ts->spi->dev, "point(%4d,%4d), pressure (%4d)\n", x, y,
 249                 pressure);
 250 }
 251
 252 static irqreturn_t tsc2005_irq_thread(int irq, void *_ts)
 253 {
 254         struct tsc2005 *ts = _ts;
 255         unsigned long flags;
 256         unsigned int pressure;
 257         u32 x, y;
 258         u32 z1, z2;
 259         int error;
 260
 261         /* read the coordinates */
 262         error = spi_sync(ts->spi, &ts->spi_read_msg);
 263         if (unlikely(error))
 264                 goto out;
 265
 266         x = ts->spi_x.spi_rx;
 267         y = ts->spi_y.spi_rx;
 268         z1 = ts->spi_z1.spi_rx;
 269         z2 = ts->spi_z2.spi_rx;
 270
 271         /* validate position */
 272         if (unlikely(x > MAX_12BIT || y > MAX_12BIT))
 273                 goto out;
 274
 275         /* Skip reading if the pressure components are out of range */
 276         if (unlikely(z1 == 0 || z2 > MAX_12BIT || z1 >= z2))
 277                 goto out;
 278
 279        /*
 280         * Skip point if this is a pen down with the exact same values as
 281         * the value before pen-up - that implies SPI fed us stale data
 282         */
 283         if (!ts->pen_down &&
 284             ts->in_x == x && ts->in_y == y &&
 285             ts->in_z1 == z1 && ts->in_z2 == z2) {
 286                 goto out;
 287         }
 288
 289         /*
 290          * At this point we are happy we have a valid and useful reading.
 291          * Remember it for later comparisons. We may now begin downsampling.
 292          */
 293         ts->in_x = x;
 294         ts->in_y = y;
 295         ts->in_z1 = z1;
 296         ts->in_z2 = z2;
 297
 298         /* Compute touch pressure resistance using equation #1 */
 299         pressure = x * (z2 - z1) / z1;
 300         pressure = pressure * ts->x_plate_ohm / 4096;
 301         if (unlikely(pressure > MAX_12BIT))
 302                 goto out;
 303
 304         spin_lock_irqsave(&ts->lock, flags);
 305
 306         tsc2005_update_pen_state(ts, x, y, pressure);
 307         mod_timer(&ts->penup_timer,
 308                   jiffies + msecs_to_jiffies(TSC2005_PENUP_TIME_MS));
 309
 310         spin_unlock_irqrestore(&ts->lock, flags);
 311
 312         ts->last_valid_interrupt = jiffies;
 313 out:
 314         return IRQ_HANDLED;
 315 }
 316
 317 static void tsc2005_penup_timer(unsigned long data)
 318 {
 319         struct tsc2005 *ts = (struct tsc2005 *)data;
 320         unsigned long flags;
 321
 322         spin_lock_irqsave(&ts->lock, flags);
 323         tsc2005_update_pen_state(ts, 0, 0, 0);
 324         spin_unlock_irqrestore(&ts->lock, flags);
 325 }
 326
 327 static void tsc2005_start_scan(struct tsc2005 *ts)
 328 {
 329         tsc2005_write(ts, TSC2005_REG_CFR0, TSC2005_CFR0_INITVALUE);
 330         tsc2005_write(ts, TSC2005_REG_CFR1, TSC2005_CFR1_INITVALUE);
 331         tsc2005_write(ts, TSC2005_REG_CFR2, TSC2005_CFR2_INITVALUE);
 332         tsc2005_cmd(ts, TSC2005_CMD_NORMAL);
 333 }
 334
 335 static void tsc2005_stop_scan(struct tsc2005 *ts)
 336 {
 337         tsc2005_cmd(ts, TSC2005_CMD_STOP);
 338 }
 339
 340 /* must be called with ts->mutex held */
 341 static void __tsc2005_disable(struct tsc2005 *ts)
 342 {
 343         tsc2005_stop_scan(ts);
 344
 345         disable_irq(ts->spi->irq);
 346         del_timer_sync(&ts->penup_timer);
 347
 348         cancel_delayed_work_sync(&ts->esd_work);
 349
 350         enable_irq(ts->spi->irq);
 351 }
 352
 353 /* must be called with ts->mutex held */
 354 static void __tsc2005_enable(struct tsc2005 *ts)
 355 {
 356         tsc2005_start_scan(ts);
 357
 358         if (ts->esd_timeout && ts->set_reset) {
 359                 ts->last_valid_interrupt = jiffies;
 360                 schedule_delayed_work(&ts->esd_work,
 361                                 round_jiffies_relative(
 362                                         msecs_to_jiffies(ts->esd_timeout)));
 363         }
 364
 365 }
 366
 367 static ssize_t tsc2005_selftest_show(struct device *dev,
 368                                      struct device_attribute *attr,
 369                                      char *buf)
 370 {
 371         struct spi_device *spi = to_spi_device(dev);
 372         struct tsc2005 *ts = spi_get_drvdata(spi);
 373         u16 temp_high;
 374         u16 temp_high_orig;
 375         u16 temp_high_test;
 376         bool success = true;
 377         int error;
 378
 379         mutex_lock(&ts->mutex);
 380
 381         /*
 382          * Test TSC2005 communications via temp high register.
 383          */
 384         __tsc2005_disable(ts);
 385
 386         error = tsc2005_read(ts, TSC2005_REG_TEMP_HIGH, &temp_high_orig);
 387         if (error) {
 388                 dev_warn(dev, "selftest failed: read error %d\n", error);
 389                 success = false;
 390                 goto out;
 391         }
 392
 393         temp_high_test = (temp_high_orig - 1) & MAX_12BIT;
 394
 395         error = tsc2005_write(ts, TSC2005_REG_TEMP_HIGH, temp_high_test);
 396         if (error) {
 397                 dev_warn(dev, "selftest failed: write error %d\n", error);
 398                 success = false;
 399                 goto out;
 400         }
 401
 402         error = tsc2005_read(ts, TSC2005_REG_TEMP_HIGH, &temp_high);
 403         if (error) {
 404                 dev_warn(dev, "selftest failed: read error %d after write\n",
 405                          error);
 406                 success = false;
 407                 goto out;
 408         }
 409
 410         if (temp_high != temp_high_test) {
 411                 dev_warn(dev, "selftest failed: %d != %d\n",
 412                          temp_high, temp_high_test);
 413                 success = false;
 414         }
 415
 416         /* hardware reset */
 417         ts->set_reset(false);
 418         usleep_range(100, 500); /* only 10us required */
 419         ts->set_reset(true);
 420
 421         if (!success)
 422                 goto out;
 423
 424         /* test that the reset really happened */
 425         error = tsc2005_read(ts, TSC2005_REG_TEMP_HIGH, &temp_high);
 426         if (error) {
 427                 dev_warn(dev, "selftest failed: read error %d after reset\n",
 428                          error);
 429                 success = false;
 430                 goto out;
 431         }
 432
 433         if (temp_high != temp_high_orig) {
 434                 dev_warn(dev, "selftest failed after reset: %d != %d\n",
 435                          temp_high, temp_high_orig);
 436                 success = false;
 437         }
 438
 439 out:
 440         __tsc2005_enable(ts);
 441         mutex_unlock(&ts->mutex);
 442
 443         return sprintf(buf, "%d\n", success);
 444 }
 445
 446 static DEVICE_ATTR(selftest, S_IRUGO, tsc2005_selftest_show, NULL);
 447
 448 static struct attribute *tsc2005_attrs[] = {
 449         &dev_attr_selftest.attr,
 450         NULL
 451 };
 452
 453 static umode_t tsc2005_attr_is_visible(struct kobject *kobj,
 454                                       struct attribute *attr, int n)
 455 {
 456         struct device *dev = container_of(kobj, struct device, kobj);
 457         struct spi_device *spi = to_spi_device(dev);
 458         struct tsc2005 *ts = spi_get_drvdata(spi);
 459         umode_t mode = attr->mode;
 460
 461         if (attr == &dev_attr_selftest.attr) {
 462                 if (!ts->set_reset)
 463                         mode = 0;
 464         }
 465
 466         return mode;
 467 }
 468
 469 static const struct attribute_group tsc2005_attr_group = {
 470         .is_visible     = tsc2005_attr_is_visible,
 471         .attrs          = tsc2005_attrs,
 472 };
 473
 474 static void tsc2005_esd_work(struct work_struct *work)
 475 {
 476         struct tsc2005 *ts = container_of(work, struct tsc2005, esd_work.work);
 477         int error;
 478         u16 r;
 479
 480         if (!mutex_trylock(&ts->mutex)) {
 481                 /*
 482                  * If the mutex is taken, it means that disable or enable is in
 483                  * progress. In that case just reschedule the work. If the work
 484                  * is not needed, it will be canceled by disable.
 485                  */
 486                 goto reschedule;
 487         }
 488
 489         if (time_is_after_jiffies(ts->last_valid_interrupt +
 490                                   msecs_to_jiffies(ts->esd_timeout)))
 491                 goto out;
 492
 493         /* We should be able to read register without disabling interrupts. */
 494         error = tsc2005_read(ts, TSC2005_REG_CFR0, &r);
 495         if (!error &&
 496             !((r ^ TSC2005_CFR0_INITVALUE) & TSC2005_CFR0_RW_MASK)) {
 497                 goto out;
 498         }
 499
 500         /*
 501          * If we could not read our known value from configuration register 0
 502          * then we should reset the controller as if from power-up and start
 503          * scanning again.
 504          */
 505         dev_info(&ts->spi->dev, "TSC2005 not responding - resetting\n");
 506
 507         disable_irq(ts->spi->irq);
 508         del_timer_sync(&ts->penup_timer);
 509
 510         tsc2005_update_pen_state(ts, 0, 0, 0);
 511
 512         ts->set_reset(false);
 513         usleep_range(100, 500); /* only 10us required */
 514         ts->set_reset(true);
 515
 516         enable_irq(ts->spi->irq);
 517         tsc2005_start_scan(ts);
 518
 519 out:
 520         mutex_unlock(&ts->mutex);
 521 reschedule:
 522         /* re-arm the watchdog */
 523         schedule_delayed_work(&ts->esd_work,
 524                               round_jiffies_relative(
 525                                         msecs_to_jiffies(ts->esd_timeout)));
 526 }
 527
 528 static int tsc2005_open(struct input_dev *input)
 529 {
 530         struct tsc2005 *ts = input_get_drvdata(input);
 531
 532         mutex_lock(&ts->mutex);
 533
 534         if (!ts->suspended)
 535                 __tsc2005_enable(ts);
 536
 537         ts->opened = true;
 538
 539         mutex_unlock(&ts->mutex);
 540
 541         return 0;
 542 }
 543
 544 static void tsc2005_close(struct input_dev *input)
 545 {
 546         struct tsc2005 *ts = input_get_drvdata(input);
 547
 548         mutex_lock(&ts->mutex);
 549
 550         if (!ts->suspended)
 551                 __tsc2005_disable(ts);
 552
 553         ts->opened = false;
 554
 555         mutex_unlock(&ts->mutex);
 556 }
 557
 558 static void tsc2005_setup_spi_xfer(struct tsc2005 *ts)
 559 {
 560         tsc2005_setup_read(&ts->spi_x, TSC2005_REG_X, false);
 561         tsc2005_setup_read(&ts->spi_y, TSC2005_REG_Y, false);
 562         tsc2005_setup_read(&ts->spi_z1, TSC2005_REG_Z1, false);
 563         tsc2005_setup_read(&ts->spi_z2, TSC2005_REG_Z2, true);
 564
 565         spi_message_init(&ts->spi_read_msg);
 566         spi_message_add_tail(&ts->spi_x.spi_xfer, &ts->spi_read_msg);
 567         spi_message_add_tail(&ts->spi_y.spi_xfer, &ts->spi_read_msg);
 568         spi_message_add_tail(&ts->spi_z1.spi_xfer, &ts->spi_read_msg);
 569         spi_message_add_tail(&ts->spi_z2.spi_xfer, &ts->spi_read_msg);
 570 }
 571
 572 static int tsc2005_probe(struct spi_device *spi)
 573 {
 574         const struct tsc2005_platform_data *pdata = spi->dev.platform_data;
 575         struct tsc2005 *ts;
 576         struct input_dev *input_dev;
 577         unsigned int max_x, max_y, max_p;
 578         unsigned int fudge_x, fudge_y, fudge_p;
 579         int error;
 580
 581         if (!pdata) {
 582                 dev_dbg(&spi->dev, "no platform data\n");
 583                 return -ENODEV;
 584         }
 585
 586         fudge_x = pdata->ts_x_fudge        ? : 4;
 587         fudge_y = pdata->ts_y_fudge        ? : 8;
 588         fudge_p = pdata->ts_pressure_fudge ? : 2;
 589         max_x   = pdata->ts_x_max          ? : MAX_12BIT;
 590         max_y   = pdata->ts_y_max          ? : MAX_12BIT;
 591         max_p   = pdata->ts_pressure_max   ? : MAX_12BIT;
 592
 593         if (spi->irq <= 0) {
 594                 dev_dbg(&spi->dev, "no irq\n");
 595                 return -ENODEV;
 596         }
 597
 598         spi->mode = SPI_MODE_0;
 599         spi->bits_per_word = 8;
 600         if (!spi->max_speed_hz)
 601                 spi->max_speed_hz = TSC2005_SPI_MAX_SPEED_HZ;
 602
 603         error = spi_setup(spi);
 604         if (error)
 605                 return error;
 606
 607         ts = kzalloc(sizeof(*ts), GFP_KERNEL);
 608         input_dev = input_allocate_device();
 609         if (!ts || !input_dev) {
 610                 error = -ENOMEM;
 611                 goto err_free_mem;
 612         }
 613
 614         ts->spi = spi;
 615         ts->idev = input_dev;
 616
 617         ts->x_plate_ohm = pdata->ts_x_plate_ohm ? : 280;
 618         ts->esd_timeout = pdata->esd_timeout_ms;
 619         ts->set_reset   = pdata->set_reset;
 620
 621         mutex_init(&ts->mutex);
 622
 623         spin_lock_init(&ts->lock);
 624         setup_timer(&ts->penup_timer, tsc2005_penup_timer, (unsigned long)ts);
 625
 626         INIT_DELAYED_WORK(&ts->esd_work, tsc2005_esd_work);
 627
 628         tsc2005_setup_spi_xfer(ts);
 629
 630         snprintf(ts->phys, sizeof(ts->phys),
 631                  "%s/input-ts", dev_name(&spi->dev));
 632
 633         input_dev->name = "TSC2005 touchscreen";
 634         input_dev->phys = ts->phys;
 635         input_dev->id.bustype = BUS_SPI;
 636         input_dev->dev.parent = &spi->dev;
 637         input_dev->evbit[0] = BIT(EV_ABS) | BIT(EV_KEY);
 638         input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
 639
 640         input_set_abs_params(input_dev, ABS_X, 0, max_x, fudge_x, 0);
 641         input_set_abs_params(input_dev, ABS_Y, 0, max_y, fudge_y, 0);
 642         input_set_abs_params(input_dev, ABS_PRESSURE, 0, max_p, fudge_p, 0);
 643
 644         input_dev->open = tsc2005_open;
 645         input_dev->close = tsc2005_close;
 646
 647         input_set_drvdata(input_dev, ts);
 648
 649         /* Ensure the touchscreen is off */
 650         tsc2005_stop_scan(ts);
 651
 652         error = request_threaded_irq(spi->irq, NULL, tsc2005_irq_thread,
 653                                      IRQF_TRIGGER_RISING | IRQF_ONESHOT,
 654                                      "tsc2005", ts);
 655         if (error) {
 656                 dev_err(&spi->dev, "Failed to request irq, err: %d\n", error);
 657                 goto err_free_mem;
 658         }
 659
 660         spi_set_drvdata(spi, ts);
 661         error = sysfs_create_group(&spi->dev.kobj, &tsc2005_attr_group);
 662         if (error) {
 663                 dev_err(&spi->dev,
 664                         "Failed to create sysfs attributes, err: %d\n", error);
 665                 goto err_clear_drvdata;
 666         }
 667
 668         error = input_register_device(ts->idev);
 669         if (error) {
 670                 dev_err(&spi->dev,
 671                         "Failed to register input device, err: %d\n", error);
 672                 goto err_remove_sysfs;
 673         }
 674
 675         irq_set_irq_wake(spi->irq, 1);
 676         return 0;
 677
 678 err_remove_sysfs:
 679         sysfs_remove_group(&spi->dev.kobj, &tsc2005_attr_group);
 680 err_clear_drvdata:
 681         spi_set_drvdata(spi, NULL);
 682         free_irq(spi->irq, ts);
 683 err_free_mem:
 684         input_free_device(input_dev);
 685         kfree(ts);
 686         return error;
 687 }
 688
 689 static int tsc2005_remove(struct spi_device *spi)
 690 {
 691         struct tsc2005 *ts = spi_get_drvdata(spi);
 692
 693         sysfs_remove_group(&ts->spi->dev.kobj, &tsc2005_attr_group);
 694
 695         free_irq(ts->spi->irq, ts);
 696         input_unregister_device(ts->idev);
 697         kfree(ts);
 698
 699         spi_set_drvdata(spi, NULL);
 700         return 0;
 701 }
 702
 703 #ifdef CONFIG_PM_SLEEP
 704 static int tsc2005_suspend(struct device *dev)
 705 {
 706         struct spi_device *spi = to_spi_device(dev);
 707         struct tsc2005 *ts = spi_get_drvdata(spi);
 708
 709         mutex_lock(&ts->mutex);
 710
 711         if (!ts->suspended && ts->opened)
 712                 __tsc2005_disable(ts);
 713
 714         ts->suspended = true;
 715
 716         mutex_unlock(&ts->mutex);
 717
 718         return 0;
 719 }
 720
 721 static int tsc2005_resume(struct device *dev)
 722 {
 723         struct spi_device *spi = to_spi_device(dev);
 724         struct tsc2005 *ts = spi_get_drvdata(spi);
 725
 726         mutex_lock(&ts->mutex);
 727
 728         if (ts->suspended && ts->opened)
 729                 __tsc2005_enable(ts);
 730
 731         ts->suspended = false;
 732
 733         mutex_unlock(&ts->mutex);
 734
 735         return 0;
 736 }
 737 #endif
 738
 739 static SIMPLE_DEV_PM_OPS(tsc2005_pm_ops, tsc2005_suspend, tsc2005_resume);
 740
 741 static struct spi_driver tsc2005_driver = {
 742         .driver = {
 743                 .name   = "tsc2005",
 744                 .owner  = THIS_MODULE,
 745                 .pm     = &tsc2005_pm_ops,
 746         },
 747         .probe  = tsc2005_probe,
 748         .remove = tsc2005_remove,
 749 };
 750
 751 module_spi_driver(tsc2005_driver);
 752
 753 MODULE_AUTHOR("Lauri Leukkunen <lauri.leukkunen@nokia.com>");
 754 MODULE_DESCRIPTION("TSC2005 Touchscreen Driver");
 755 MODULE_LICENSE("GPL");
 756 MODULE_ALIAS("spi:tsc2005");