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 timer_list       esd_timer;
 137         struct work_struct      esd_work;
 138
 139         unsigned int            x_plate_ohm;
 140
 141         bool                    disabled;
 142         unsigned int            disable_depth;
 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         mutex_lock(&ts->mutex);
 262
 263         if (unlikely(ts->disable_depth))
 264                 goto out;
 265
 266         /* read the coordinates */
 267         error = spi_sync(ts->spi, &ts->spi_read_msg);
 268         if (unlikely(error))
 269                 goto out;
 270
 271         x = ts->spi_x.spi_rx;
 272         y = ts->spi_y.spi_rx;
 273         z1 = ts->spi_z1.spi_rx;
 274         z2 = ts->spi_z2.spi_rx;
 275
 276         /* validate position */
 277         if (unlikely(x > MAX_12BIT || y > MAX_12BIT))
 278                 goto out;
 279
 280         /* Skip reading if the pressure components are out of range */
 281         if (unlikely(z1 == 0 || z2 > MAX_12BIT || z1 >= z2))
 282                 goto out;
 283
 284        /*
 285         * Skip point if this is a pen down with the exact same values as
 286         * the value before pen-up - that implies SPI fed us stale data
 287         */
 288         if (!ts->pen_down &&
 289             ts->in_x == x && ts->in_y == y &&
 290             ts->in_z1 == z1 && ts->in_z2 == z2) {
 291                 goto out;
 292         }
 293
 294         /*
 295          * At this point we are happy we have a valid and useful reading.
 296          * Remember it for later comparisons. We may now begin downsampling.
 297          */
 298         ts->in_x = x;
 299         ts->in_y = y;
 300         ts->in_z1 = z1;
 301         ts->in_z2 = z2;
 302
 303         /* Compute touch pressure resistance using equation #1 */
 304         pressure = x * (z2 - z1) / z1;
 305         pressure = pressure * ts->x_plate_ohm / 4096;
 306         if (unlikely(pressure > MAX_12BIT))
 307                 goto out;
 308
 309         spin_lock_irqsave(&ts->lock, flags);
 310
 311         tsc2005_update_pen_state(ts, x, y, pressure);
 312
 313         /* set the penup timer */
 314         mod_timer(&ts->penup_timer,
 315                   jiffies + msecs_to_jiffies(TSC2005_PENUP_TIME_MS));
 316
 317         if (ts->esd_timeout && ts->set_reset) {
 318                 /* update the watchdog timer */
 319                 mod_timer(&ts->esd_timer, round_jiffies(jiffies +
 320                                         msecs_to_jiffies(ts->esd_timeout)));
 321         }
 322
 323         spin_unlock_irqrestore(&ts->lock, flags);
 324
 325 out:
 326         mutex_unlock(&ts->mutex);
 327         return IRQ_HANDLED;
 328 }
 329
 330 static void tsc2005_penup_timer(unsigned long data)
 331 {
 332         struct tsc2005 *ts = (struct tsc2005 *)data;
 333         unsigned long flags;
 334
 335         spin_lock_irqsave(&ts->lock, flags);
 336         tsc2005_update_pen_state(ts, 0, 0, 0);
 337         spin_unlock_irqrestore(&ts->lock, flags);
 338 }
 339
 340 static void tsc2005_start_scan(struct tsc2005 *ts)
 341 {
 342         tsc2005_write(ts, TSC2005_REG_CFR0, TSC2005_CFR0_INITVALUE);
 343         tsc2005_write(ts, TSC2005_REG_CFR1, TSC2005_CFR1_INITVALUE);
 344         tsc2005_write(ts, TSC2005_REG_CFR2, TSC2005_CFR2_INITVALUE);
 345         tsc2005_cmd(ts, TSC2005_CMD_NORMAL);
 346 }
 347
 348 static void tsc2005_stop_scan(struct tsc2005 *ts)
 349 {
 350         tsc2005_cmd(ts, TSC2005_CMD_STOP);
 351 }
 352
 353 /* must be called with mutex held */
 354 static void tsc2005_disable(struct tsc2005 *ts)
 355 {
 356         if (ts->disable_depth++ != 0)
 357                 return;
 358         disable_irq(ts->spi->irq);
 359         if (ts->esd_timeout)
 360                 del_timer_sync(&ts->esd_timer);
 361         del_timer_sync(&ts->penup_timer);
 362         tsc2005_stop_scan(ts);
 363 }
 364
 365 /* must be called with mutex held */
 366 static void tsc2005_enable(struct tsc2005 *ts)
 367 {
 368         if (--ts->disable_depth != 0)
 369                 return;
 370         tsc2005_start_scan(ts);
 371         enable_irq(ts->spi->irq);
 372         if (!ts->esd_timeout)
 373                 return;
 374         mod_timer(&ts->esd_timer,
 375                   round_jiffies(jiffies + msecs_to_jiffies(ts->esd_timeout)));
 376 }
 377
 378 static ssize_t tsc2005_disable_show(struct device *dev,
 379                                     struct device_attribute *attr, char *buf)
 380 {
 381         struct spi_device *spi = to_spi_device(dev);
 382         struct tsc2005 *ts = spi_get_drvdata(spi);
 383
 384         return sprintf(buf, "%u\n", ts->disabled);
 385 }
 386
 387 static ssize_t tsc2005_disable_store(struct device *dev,
 388                                      struct device_attribute *attr,
 389                                      const char *buf, size_t count)
 390 {
 391         struct spi_device *spi = to_spi_device(dev);
 392         struct tsc2005 *ts = spi_get_drvdata(spi);
 393         unsigned long res;
 394         int i;
 395
 396         if (strict_strtoul(buf, 10, &res) < 0)
 397                 return -EINVAL;
 398         i = res ? 1 : 0;
 399
 400         mutex_lock(&ts->mutex);
 401         if (i == ts->disabled)
 402                 goto out;
 403         ts->disabled = i;
 404         if (i)
 405                 tsc2005_disable(ts);
 406         else
 407                 tsc2005_enable(ts);
 408 out:
 409         mutex_unlock(&ts->mutex);
 410         return count;
 411 }
 412 static DEVICE_ATTR(disable, 0664, tsc2005_disable_show, tsc2005_disable_store);
 413
 414 static ssize_t tsc2005_selftest_show(struct device *dev,
 415                                      struct device_attribute *attr,
 416                                      char *buf)
 417 {
 418         struct spi_device *spi = to_spi_device(dev);
 419         struct tsc2005 *ts = spi_get_drvdata(spi);
 420         u16 temp_high;
 421         u16 temp_high_orig;
 422         u16 temp_high_test;
 423         bool success = true;
 424         int error;
 425
 426         mutex_lock(&ts->mutex);
 427
 428         /*
 429          * Test TSC2005 communications via temp high register.
 430          */
 431         tsc2005_disable(ts);
 432
 433         error = tsc2005_read(ts, TSC2005_REG_TEMP_HIGH, &temp_high_orig);
 434         if (error) {
 435                 dev_warn(dev, "selftest failed: read error %d\n", error);
 436                 success = false;
 437                 goto out;
 438         }
 439
 440         temp_high_test = (temp_high_orig - 1) & MAX_12BIT;
 441
 442         error = tsc2005_write(ts, TSC2005_REG_TEMP_HIGH, temp_high_test);
 443         if (error) {
 444                 dev_warn(dev, "selftest failed: write error %d\n", error);
 445                 success = false;
 446                 goto out;
 447         }
 448
 449         error = tsc2005_read(ts, TSC2005_REG_TEMP_HIGH, &temp_high);
 450         if (error) {
 451                 dev_warn(dev, "selftest failed: read error %d after write\n",
 452                          error);
 453                 success = false;
 454                 goto out;
 455         }
 456
 457         if (temp_high != temp_high_test) {
 458                 dev_warn(dev, "selftest failed: %d != %d\n",
 459                          temp_high, temp_high_test);
 460                 success = false;
 461         }
 462
 463         /* hardware reset */
 464         ts->set_reset(false);
 465         usleep_range(100, 500); /* only 10us required */
 466         ts->set_reset(true);
 467
 468         if (!success)
 469                 goto out;
 470
 471         /* test that the reset really happened */
 472         error = tsc2005_read(ts, TSC2005_REG_TEMP_HIGH, &temp_high);
 473         if (error) {
 474                 dev_warn(dev, "selftest failed: read error %d after reset\n",
 475                          error);
 476                 success = false;
 477                 goto out;
 478         }
 479
 480         if (temp_high != temp_high_orig) {
 481                 dev_warn(dev, "selftest failed after reset: %d != %d\n",
 482                          temp_high, temp_high_orig);
 483                 success = false;
 484         }
 485
 486 out:
 487         tsc2005_enable(ts);
 488         mutex_unlock(&ts->mutex);
 489
 490         return sprintf(buf, "%d\n", success);
 491 }
 492
 493 static DEVICE_ATTR(selftest, S_IRUGO, tsc2005_selftest_show, NULL);
 494
 495 static struct attribute *tsc2005_attrs[] = {
 496         &dev_attr_disable.attr,
 497         &dev_attr_selftest.attr,
 498         NULL
 499 };
 500
 501 static mode_t tsc2005_attr_is_visible(struct kobject *kobj,
 502                                       struct attribute *attr, int n)
 503 {
 504         struct device *dev = container_of(kobj, struct device, kobj);
 505         struct spi_device *spi = to_spi_device(dev);
 506         struct tsc2005 *ts = spi_get_drvdata(spi);
 507         mode_t mode = attr->mode;
 508
 509         if (attr == &dev_attr_selftest.attr) {
 510                 if (!ts->set_reset)
 511                         mode = 0;
 512         }
 513
 514         return mode;
 515 }
 516
 517 static const struct attribute_group tsc2005_attr_group = {
 518         .is_visible     = tsc2005_attr_is_visible,
 519         .attrs          = tsc2005_attrs,
 520 };
 521
 522 static void tsc2005_esd_timer(unsigned long data)
 523 {
 524         struct tsc2005 *ts = (struct tsc2005 *)data;
 525
 526         schedule_work(&ts->esd_work);
 527 }
 528
 529 static void tsc2005_esd_work(struct work_struct *work)
 530 {
 531         struct tsc2005 *ts = container_of(work, struct tsc2005, esd_work);
 532         int error;
 533         u16 r;
 534
 535         mutex_lock(&ts->mutex);
 536
 537         if (ts->disable_depth)
 538                 goto out;
 539
 540         /*
 541          * If we cannot read our known value from configuration register 0 then
 542          * reset the controller as if from power-up and start scanning again.
 543          */
 544         error = tsc2005_read(ts, TSC2005_REG_CFR0, &r);
 545         if (error ||
 546             ((r ^ TSC2005_CFR0_INITVALUE) & TSC2005_CFR0_RW_MASK)) {
 547                 dev_info(&ts->spi->dev, "TSC2005 not responding - resetting\n");
 548                 ts->set_reset(false);
 549                 tsc2005_update_pen_state(ts, 0, 0, 0);
 550                 usleep_range(100, 500); /* only 10us required */
 551                 ts->set_reset(true);
 552                 tsc2005_start_scan(ts);
 553         }
 554
 555         /* re-arm the watchdog */
 556         mod_timer(&ts->esd_timer,
 557                   round_jiffies(jiffies + msecs_to_jiffies(ts->esd_timeout)));
 558
 559 out:
 560         mutex_unlock(&ts->mutex);
 561 }
 562
 563 static void __devinit tsc2005_setup_spi_xfer(struct tsc2005 *ts)
 564 {
 565         tsc2005_setup_read(&ts->spi_x, TSC2005_REG_X, false);
 566         tsc2005_setup_read(&ts->spi_y, TSC2005_REG_Y, false);
 567         tsc2005_setup_read(&ts->spi_z1, TSC2005_REG_Z1, false);
 568         tsc2005_setup_read(&ts->spi_z2, TSC2005_REG_Z2, true);
 569
 570         spi_message_init(&ts->spi_read_msg);
 571         spi_message_add_tail(&ts->spi_x.spi_xfer, &ts->spi_read_msg);
 572         spi_message_add_tail(&ts->spi_y.spi_xfer, &ts->spi_read_msg);
 573         spi_message_add_tail(&ts->spi_z1.spi_xfer, &ts->spi_read_msg);
 574         spi_message_add_tail(&ts->spi_z2.spi_xfer, &ts->spi_read_msg);
 575 }
 576
 577 static int __devinit tsc2005_probe(struct spi_device *spi)
 578 {
 579         const struct tsc2005_platform_data *pdata = spi->dev.platform_data;
 580         struct tsc2005 *ts;
 581         struct input_dev *input_dev;
 582         unsigned int max_x, max_y, max_p;
 583         unsigned int fudge_x, fudge_y, fudge_p;
 584         int error;
 585
 586         if (!pdata) {
 587                 dev_dbg(&spi->dev, "no platform data\n");
 588                 return -ENODEV;
 589         }
 590
 591         fudge_x = pdata->ts_x_fudge        ? : 4;
 592         fudge_y = pdata->ts_y_fudge        ? : 8;
 593         fudge_p = pdata->ts_pressure_fudge ? : 2;
 594         max_x   = pdata->ts_x_max          ? : MAX_12BIT;
 595         max_y   = pdata->ts_y_max          ? : MAX_12BIT;
 596         max_p   = pdata->ts_pressure_max   ? : MAX_12BIT;
 597
 598         if (spi->irq <= 0) {
 599                 dev_dbg(&spi->dev, "no irq\n");
 600                 return -ENODEV;
 601         }
 602
 603         spi->mode = SPI_MODE_0;
 604         spi->bits_per_word = 8;
 605         if (!spi->max_speed_hz)
 606                 spi->max_speed_hz = TSC2005_SPI_MAX_SPEED_HZ;
 607
 608         error = spi_setup(spi);
 609         if (error)
 610                 return error;
 611
 612         ts = kzalloc(sizeof(*ts), GFP_KERNEL);
 613         input_dev = input_allocate_device();
 614         if (!ts || !input_dev) {
 615                 error = -ENOMEM;
 616                 goto err_free_mem;
 617         }
 618
 619         ts->spi = spi;
 620         ts->idev = input_dev;
 621
 622         ts->x_plate_ohm = pdata->ts_x_plate_ohm ? : 280;
 623         ts->esd_timeout = pdata->esd_timeout_ms;
 624         ts->set_reset   = pdata->set_reset;
 625
 626         mutex_init(&ts->mutex);
 627
 628         spin_lock_init(&ts->lock);
 629         setup_timer(&ts->penup_timer, tsc2005_penup_timer, (unsigned long)ts);
 630
 631         setup_timer(&ts->esd_timer, tsc2005_esd_timer, (unsigned long)ts);
 632         INIT_WORK(&ts->esd_work, tsc2005_esd_work);
 633
 634         tsc2005_setup_spi_xfer(ts);
 635
 636         snprintf(ts->phys, sizeof(ts->phys),
 637                  "%s/input-ts", dev_name(&spi->dev));
 638
 639         input_dev->name = "TSC2005 touchscreen";
 640         input_dev->phys = ts->phys;
 641         input_dev->id.bustype = BUS_SPI;
 642         input_dev->dev.parent = &spi->dev;
 643         input_dev->evbit[0] = BIT(EV_ABS) | BIT(EV_KEY);
 644         input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
 645
 646         input_set_abs_params(input_dev, ABS_X, 0, max_x, fudge_x, 0);
 647         input_set_abs_params(input_dev, ABS_Y, 0, max_y, fudge_y, 0);
 648         input_set_abs_params(input_dev, ABS_PRESSURE, 0, max_p, fudge_p, 0);
 649
 650         error = request_threaded_irq(spi->irq, NULL, tsc2005_irq_thread,
 651                                      IRQF_TRIGGER_RISING, "tsc2005", ts);
 652         if (error) {
 653                 dev_err(&spi->dev, "Failed to request irq, err: %d\n", error);
 654                 goto err_free_mem;
 655         }
 656
 657         spi_set_drvdata(spi, ts);
 658         error = sysfs_create_group(&spi->dev.kobj, &tsc2005_attr_group);
 659         if (error) {
 660                 dev_err(&spi->dev,
 661                         "Failed to create sysfs attributes, err: %d\n", error);
 662                 goto err_clear_drvdata;
 663         }
 664
 665         error = input_register_device(ts->idev);
 666         if (error) {
 667                 dev_err(&spi->dev,
 668                         "Failed to register input device, err: %d\n", error);
 669                 goto err_remove_sysfs;
 670         }
 671
 672         tsc2005_start_scan(ts);
 673
 674         if (ts->esd_timeout && ts->set_reset) {
 675                 /* start the optional ESD watchdog */
 676                 mod_timer(&ts->esd_timer, round_jiffies(jiffies +
 677                                         msecs_to_jiffies(ts->esd_timeout)));
 678         }
 679
 680         set_irq_wake(spi->irq, 1);
 681         return 0;
 682
 683 err_remove_sysfs:
 684         sysfs_remove_group(&spi->dev.kobj, &tsc2005_attr_group);
 685 err_clear_drvdata:
 686         spi_set_drvdata(spi, NULL);
 687         free_irq(spi->irq, ts);
 688 err_free_mem:
 689         input_free_device(input_dev);
 690         kfree(ts);
 691         return error;
 692 }
 693
 694 static int __devexit tsc2005_remove(struct spi_device *spi)
 695 {
 696         struct tsc2005 *ts = spi_get_drvdata(spi);
 697
 698         sysfs_remove_group(&ts->spi->dev.kobj, &tsc2005_attr_group);
 699
 700         mutex_lock(&ts->mutex);
 701         tsc2005_disable(ts);
 702         mutex_unlock(&ts->mutex);
 703
 704         if (ts->esd_timeout)
 705                 del_timer_sync(&ts->esd_timer);
 706         del_timer_sync(&ts->penup_timer);
 707
 708         flush_work(&ts->esd_work);
 709
 710         free_irq(ts->spi->irq, ts);
 711         input_unregister_device(ts->idev);
 712         kfree(ts);
 713
 714         spi_set_drvdata(spi, NULL);
 715         return 0;
 716 }
 717
 718 #ifdef CONFIG_PM_SLEEP
 719 static int tsc2005_suspend(struct device *dev)
 720 {
 721         struct spi_device *spi = to_spi_device(dev);
 722         struct tsc2005 *ts = spi_get_drvdata(spi);
 723
 724         mutex_lock(&ts->mutex);
 725         tsc2005_disable(ts);
 726         mutex_unlock(&ts->mutex);
 727
 728         return 0;
 729 }
 730
 731 static int tsc2005_resume(struct device *dev)
 732 {
 733         struct spi_device *spi = to_spi_device(dev);
 734         struct tsc2005 *ts = spi_get_drvdata(spi);
 735
 736         mutex_lock(&ts->mutex);
 737         tsc2005_enable(ts);
 738         mutex_unlock(&ts->mutex);
 739
 740         return 0;
 741 }
 742 #endif
 743
 744 static SIMPLE_DEV_PM_OPS(tsc2005_pm_ops, tsc2005_suspend, tsc2005_resume);
 745
 746 static struct spi_driver tsc2005_driver = {
 747         .driver = {
 748                 .name   = "tsc2005",
 749                 .owner  = THIS_MODULE,
 750                 .pm     = &tsc2005_pm_ops,
 751         },
 752         .probe  = tsc2005_probe,
 753         .remove = __devexit_p(tsc2005_remove),
 754 };
 755
 756 static int __init tsc2005_init(void)
 757 {
 758         return spi_register_driver(&tsc2005_driver);
 759 }
 760 module_init(tsc2005_init);
 761
 762 static void __exit tsc2005_exit(void)
 763 {
 764         spi_unregister_driver(&tsc2005_driver);
 765 }
 766 module_exit(tsc2005_exit);
 767
 768 MODULE_AUTHOR("Lauri Leukkunen <lauri.leukkunen@nokia.com>");
 769 MODULE_DESCRIPTION("TSC2005 Touchscreen Driver");
 770 MODULE_LICENSE("GPL");