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 void 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
 159         spi_message_init(&msg);
 160         spi_message_add_tail(&xfer, &msg);
 161         spi_sync(ts->spi, &msg);
 162 }
 163
 164 static void tsc2005_write(struct tsc2005 *ts, u8 reg, u16 value)
 165 {
 166         u32 tx = ((reg | TSC2005_REG_PND0) << 16) | value;
 167         struct spi_transfer xfer = {
 168                 .tx_buf         = &tx,
 169                 .len            = 4,
 170                 .bits_per_word  = 24,
 171         };
 172         struct spi_message msg;
 173
 174         spi_message_init(&msg);
 175         spi_message_add_tail(&xfer, &msg);
 176         spi_sync(ts->spi, &msg);
 177 }
 178
 179 static void tsc2005_setup_read(struct tsc2005_spi_rd *rd, u8 reg, bool last)
 180 {
 181         memset(rd, 0, sizeof(*rd));
 182
 183         rd->spi_tx                 = (reg | TSC2005_REG_READ) << 16;
 184         rd->spi_xfer.tx_buf        = &rd->spi_tx;
 185         rd->spi_xfer.rx_buf        = &rd->spi_rx;
 186         rd->spi_xfer.len           = 4;
 187         rd->spi_xfer.bits_per_word = 24;
 188         rd->spi_xfer.cs_change     = !last;
 189 }
 190
 191 static void tsc2005_read(struct tsc2005 *ts, u8 reg, u16 *value)
 192 {
 193         struct tsc2005_spi_rd spi_rd;
 194         struct spi_message msg;
 195
 196         tsc2005_setup_read(&spi_rd, reg, true);
 197
 198         spi_message_init(&msg);
 199         spi_message_add_tail(&spi_rd.spi_xfer, &msg);
 200         spi_sync(ts->spi, &msg);
 201
 202         *value = spi_rd.spi_rx;
 203 }
 204
 205 static void tsc2005_update_pen_state(struct tsc2005 *ts,
 206                                      int x, int y, int pressure)
 207 {
 208         if (pressure) {
 209                 input_report_abs(ts->idev, ABS_X, x);
 210                 input_report_abs(ts->idev, ABS_Y, y);
 211                 input_report_abs(ts->idev, ABS_PRESSURE, pressure);
 212                 if (!ts->pen_down) {
 213                         input_report_key(ts->idev, BTN_TOUCH, !!pressure);
 214                         ts->pen_down = true;
 215                 }
 216         } else {
 217                 input_report_abs(ts->idev, ABS_PRESSURE, 0);
 218                 if (ts->pen_down) {
 219                         input_report_key(ts->idev, BTN_TOUCH, 0);
 220                         ts->pen_down = false;
 221                 }
 222         }
 223         input_sync(ts->idev);
 224         dev_dbg(&ts->spi->dev, "point(%4d,%4d), pressure (%4d)\n", x, y,
 225                 pressure);
 226 }
 227
 228 static irqreturn_t tsc2005_irq_thread(int irq, void *_ts)
 229 {
 230         struct tsc2005 *ts = _ts;
 231         unsigned long flags;
 232         unsigned int pressure;
 233         u32 x, y;
 234         u32 z1, z2;
 235
 236         mutex_lock(&ts->mutex);
 237
 238         if (unlikely(ts->disable_depth))
 239                 goto out;
 240
 241         /* read the coordinates */
 242         spi_sync(ts->spi, &ts->spi_read_msg);
 243         x = ts->spi_x.spi_rx;
 244         y = ts->spi_y.spi_rx;
 245         z1 = ts->spi_z1.spi_rx;
 246         z2 = ts->spi_z2.spi_rx;
 247
 248         /* validate position */
 249         if (unlikely(x > MAX_12BIT || y > MAX_12BIT))
 250                 goto out;
 251
 252         /* Skip reading if the pressure components are out of range */
 253         if (unlikely(z1 == 0 || z2 > MAX_12BIT || z1 >= z2))
 254                 goto out;
 255
 256        /*
 257         * Skip point if this is a pen down with the exact same values as
 258         * the value before pen-up - that implies SPI fed us stale data
 259         */
 260         if (!ts->pen_down &&
 261             ts->in_x == x && ts->in_y == y &&
 262             ts->in_z1 == z1 && ts->in_z2 == z2) {
 263                 goto out;
 264         }
 265
 266         /*
 267          * At this point we are happy we have a valid and useful reading.
 268          * Remember it for later comparisons. We may now begin downsampling.
 269          */
 270         ts->in_x = x;
 271         ts->in_y = y;
 272         ts->in_z1 = z1;
 273         ts->in_z2 = z2;
 274
 275         /* Compute touch pressure resistance using equation #1 */
 276         pressure = x * (z2 - z1) / z1;
 277         pressure = pressure * ts->x_plate_ohm / 4096;
 278         if (unlikely(pressure > MAX_12BIT))
 279                 goto out;
 280
 281         spin_lock_irqsave(&ts->lock, flags);
 282
 283         tsc2005_update_pen_state(ts, x, y, pressure);
 284
 285         /* set the penup timer */
 286         mod_timer(&ts->penup_timer,
 287                   jiffies + msecs_to_jiffies(TSC2005_PENUP_TIME_MS));
 288
 289         if (ts->esd_timeout && ts->set_reset) {
 290                 /* update the watchdog timer */
 291                 mod_timer(&ts->esd_timer, round_jiffies(jiffies +
 292                                         msecs_to_jiffies(ts->esd_timeout)));
 293         }
 294
 295         spin_unlock_irqrestore(&ts->lock, flags);
 296
 297 out:
 298         mutex_unlock(&ts->mutex);
 299         return IRQ_HANDLED;
 300 }
 301
 302 static void tsc2005_penup_timer(unsigned long data)
 303 {
 304         struct tsc2005 *ts = (struct tsc2005 *)data;
 305         unsigned long flags;
 306
 307         spin_lock_irqsave(&ts->lock, flags);
 308         tsc2005_update_pen_state(ts, 0, 0, 0);
 309         spin_unlock_irqrestore(&ts->lock, flags);
 310 }
 311
 312 static void tsc2005_start_scan(struct tsc2005 *ts)
 313 {
 314         tsc2005_write(ts, TSC2005_REG_CFR0, TSC2005_CFR0_INITVALUE);
 315         tsc2005_write(ts, TSC2005_REG_CFR1, TSC2005_CFR1_INITVALUE);
 316         tsc2005_write(ts, TSC2005_REG_CFR2, TSC2005_CFR2_INITVALUE);
 317         tsc2005_cmd(ts, TSC2005_CMD_NORMAL);
 318 }
 319
 320 static void tsc2005_stop_scan(struct tsc2005 *ts)
 321 {
 322         tsc2005_cmd(ts, TSC2005_CMD_STOP);
 323 }
 324
 325 /* must be called with mutex held */
 326 static void tsc2005_disable(struct tsc2005 *ts)
 327 {
 328         if (ts->disable_depth++ != 0)
 329                 return;
 330         disable_irq(ts->spi->irq);
 331         if (ts->esd_timeout)
 332                 del_timer_sync(&ts->esd_timer);
 333         del_timer_sync(&ts->penup_timer);
 334         tsc2005_stop_scan(ts);
 335 }
 336
 337 /* must be called with mutex held */
 338 static void tsc2005_enable(struct tsc2005 *ts)
 339 {
 340         if (--ts->disable_depth != 0)
 341                 return;
 342         tsc2005_start_scan(ts);
 343         enable_irq(ts->spi->irq);
 344         if (!ts->esd_timeout)
 345                 return;
 346         mod_timer(&ts->esd_timer,
 347                   round_jiffies(jiffies + msecs_to_jiffies(ts->esd_timeout)));
 348 }
 349
 350 static ssize_t tsc2005_disable_show(struct device *dev,
 351                                     struct device_attribute *attr, char *buf)
 352 {
 353         struct spi_device *spi = to_spi_device(dev);
 354         struct tsc2005 *ts = spi_get_drvdata(spi);
 355
 356         return sprintf(buf, "%u\n", ts->disabled);
 357 }
 358
 359 static ssize_t tsc2005_disable_store(struct device *dev,
 360                                      struct device_attribute *attr,
 361                                      const char *buf, size_t count)
 362 {
 363         struct spi_device *spi = to_spi_device(dev);
 364         struct tsc2005 *ts = spi_get_drvdata(spi);
 365         unsigned long res;
 366         int i;
 367
 368         if (strict_strtoul(buf, 10, &res) < 0)
 369                 return -EINVAL;
 370         i = res ? 1 : 0;
 371
 372         mutex_lock(&ts->mutex);
 373         if (i == ts->disabled)
 374                 goto out;
 375         ts->disabled = i;
 376         if (i)
 377                 tsc2005_disable(ts);
 378         else
 379                 tsc2005_enable(ts);
 380 out:
 381         mutex_unlock(&ts->mutex);
 382         return count;
 383 }
 384 static DEVICE_ATTR(disable, 0664, tsc2005_disable_show, tsc2005_disable_store);
 385
 386 static ssize_t tsc2005_selftest_show(struct device *dev,
 387                                      struct device_attribute *attr,
 388                                      char *buf)
 389 {
 390         struct spi_device *spi = to_spi_device(dev);
 391         struct tsc2005 *ts = spi_get_drvdata(spi);
 392         u16 temp_high;
 393         u16 temp_high_orig;
 394         u16 temp_high_test;
 395         unsigned int result;
 396
 397         mutex_lock(&ts->mutex);
 398
 399         /*
 400          * Test TSC2005 communications via temp high register.
 401          */
 402         tsc2005_disable(ts);
 403         result = 1;
 404         tsc2005_read(ts, TSC2005_REG_TEMP_HIGH, &temp_high_orig);
 405         temp_high_test = (temp_high_orig - 1) & MAX_12BIT;
 406         tsc2005_write(ts, TSC2005_REG_TEMP_HIGH, temp_high_test);
 407         tsc2005_read(ts, TSC2005_REG_TEMP_HIGH, &temp_high);
 408         if (temp_high != temp_high_test) {
 409                 dev_warn(dev, "selftest failed: %d != %d\n",
 410                          temp_high, temp_high_test);
 411                 result = 0;
 412         }
 413
 414         /* hardware reset */
 415         ts->set_reset(false);
 416         usleep_range(100, 500); /* only 10us required */
 417         ts->set_reset(true);
 418         tsc2005_enable(ts);
 419
 420         /* test that the reset really happened */
 421         tsc2005_read(ts, TSC2005_REG_TEMP_HIGH, &temp_high);
 422         if (temp_high != temp_high_orig) {
 423                 dev_warn(dev, "selftest failed after reset: %d != %d\n",
 424                          temp_high, temp_high_orig);
 425                 result = 0;
 426         }
 427
 428         mutex_unlock(&ts->mutex);
 429
 430         return sprintf(buf, "%u\n", result);
 431 }
 432
 433 static DEVICE_ATTR(selftest, S_IRUGO, tsc2005_selftest_show, NULL);
 434
 435 static struct attribute *tsc2005_attrs[] = {
 436         &dev_attr_disable.attr,
 437         &dev_attr_selftest.attr,
 438         NULL
 439 };
 440
 441 static mode_t tsc2005_attr_is_visible(struct kobject *kobj,
 442                                       struct attribute *attr, int n)
 443 {
 444         struct device *dev = container_of(kobj, struct device, kobj);
 445         struct spi_device *spi = to_spi_device(dev);
 446         struct tsc2005 *ts = spi_get_drvdata(spi);
 447         mode_t mode = attr->mode;
 448
 449         if (attr == &dev_attr_selftest.attr) {
 450                 if (!ts->set_reset)
 451                         mode = 0;
 452         }
 453
 454         return mode;
 455 }
 456
 457 static const struct attribute_group tsc2005_attr_group = {
 458         .is_visible     = tsc2005_attr_is_visible,
 459         .attrs          = tsc2005_attrs,
 460 };
 461
 462 static void tsc2005_esd_timer(unsigned long data)
 463 {
 464         struct tsc2005 *ts = (struct tsc2005 *)data;
 465
 466         schedule_work(&ts->esd_work);
 467 }
 468
 469 static void tsc2005_esd_work(struct work_struct *work)
 470 {
 471         struct tsc2005 *ts = container_of(work, struct tsc2005, esd_work);
 472         u16 r;
 473
 474         mutex_lock(&ts->mutex);
 475
 476         if (ts->disable_depth)
 477                 goto out;
 478
 479         /*
 480          * If we cannot read our known value from configuration register 0 then
 481          * reset the controller as if from power-up and start scanning again.
 482          */
 483         tsc2005_read(ts, TSC2005_REG_CFR0, &r);
 484         if ((r ^ TSC2005_CFR0_INITVALUE) & TSC2005_CFR0_RW_MASK) {
 485                 dev_info(&ts->spi->dev, "TSC2005 not responding - resetting\n");
 486                 ts->set_reset(false);
 487                 tsc2005_update_pen_state(ts, 0, 0, 0);
 488                 usleep_range(100, 500); /* only 10us required */
 489                 ts->set_reset(true);
 490                 tsc2005_start_scan(ts);
 491         }
 492
 493         /* re-arm the watchdog */
 494         mod_timer(&ts->esd_timer,
 495                   round_jiffies(jiffies + msecs_to_jiffies(ts->esd_timeout)));
 496
 497 out:
 498         mutex_unlock(&ts->mutex);
 499 }
 500
 501 static void __devinit tsc2005_setup_spi_xfer(struct tsc2005 *ts)
 502 {
 503         tsc2005_setup_read(&ts->spi_x, TSC2005_REG_X, false);
 504         tsc2005_setup_read(&ts->spi_y, TSC2005_REG_Y, false);
 505         tsc2005_setup_read(&ts->spi_z1, TSC2005_REG_Z1, false);
 506         tsc2005_setup_read(&ts->spi_z2, TSC2005_REG_Z2, true);
 507
 508         spi_message_init(&ts->spi_read_msg);
 509         spi_message_add_tail(&ts->spi_x.spi_xfer, &ts->spi_read_msg);
 510         spi_message_add_tail(&ts->spi_y.spi_xfer, &ts->spi_read_msg);
 511         spi_message_add_tail(&ts->spi_z1.spi_xfer, &ts->spi_read_msg);
 512         spi_message_add_tail(&ts->spi_z2.spi_xfer, &ts->spi_read_msg);
 513 }
 514
 515 static int __devinit tsc2005_probe(struct spi_device *spi)
 516 {
 517         const struct tsc2005_platform_data *pdata = spi->dev.platform_data;
 518         struct tsc2005 *ts;
 519         struct input_dev *input_dev;
 520         unsigned int max_x, max_y, max_p;
 521         unsigned int fudge_x, fudge_y, fudge_p;
 522         int error;
 523
 524         if (!pdata) {
 525                 dev_dbg(&spi->dev, "no platform data\n");
 526                 return -ENODEV;
 527         }
 528
 529         fudge_x = pdata->ts_x_fudge        ? : 4;
 530         fudge_y = pdata->ts_y_fudge        ? : 8;
 531         fudge_p = pdata->ts_pressure_fudge ? : 2;
 532         max_x   = pdata->ts_x_max          ? : MAX_12BIT;
 533         max_y   = pdata->ts_y_max          ? : MAX_12BIT;
 534         max_p   = pdata->ts_pressure_max   ? : MAX_12BIT;
 535
 536         if (spi->irq <= 0) {
 537                 dev_dbg(&spi->dev, "no irq\n");
 538                 return -ENODEV;
 539         }
 540
 541         spi->mode = SPI_MODE_0;
 542         spi->bits_per_word = 8;
 543         if (!spi->max_speed_hz)
 544                 spi->max_speed_hz = TSC2005_SPI_MAX_SPEED_HZ;
 545
 546         error = spi_setup(spi);
 547         if (error)
 548                 return error;
 549
 550         ts = kzalloc(sizeof(*ts), GFP_KERNEL);
 551         input_dev = input_allocate_device();
 552         if (!ts || !input_dev) {
 553                 error = -ENOMEM;
 554                 goto err_free_mem;
 555         }
 556
 557         ts->spi = spi;
 558         ts->idev = input_dev;
 559
 560         ts->x_plate_ohm = pdata->ts_x_plate_ohm ? : 280;
 561         ts->esd_timeout = pdata->esd_timeout_ms;
 562         ts->set_reset   = pdata->set_reset;
 563
 564         mutex_init(&ts->mutex);
 565
 566         spin_lock_init(&ts->lock);
 567         setup_timer(&ts->penup_timer, tsc2005_penup_timer, (unsigned long)ts);
 568
 569         setup_timer(&ts->esd_timer, tsc2005_esd_timer, (unsigned long)ts);
 570         INIT_WORK(&ts->esd_work, tsc2005_esd_work);
 571
 572         tsc2005_setup_spi_xfer(ts);
 573
 574         snprintf(ts->phys, sizeof(ts->phys),
 575                  "%s/input-ts", dev_name(&spi->dev));
 576
 577         input_dev->name = "TSC2005 touchscreen";
 578         input_dev->phys = ts->phys;
 579         input_dev->id.bustype = BUS_SPI;
 580         input_dev->dev.parent = &spi->dev;
 581         input_dev->evbit[0] = BIT(EV_ABS) | BIT(EV_KEY);
 582         input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
 583
 584         input_set_abs_params(input_dev, ABS_X, 0, max_x, fudge_x, 0);
 585         input_set_abs_params(input_dev, ABS_Y, 0, max_y, fudge_y, 0);
 586         input_set_abs_params(input_dev, ABS_PRESSURE, 0, max_p, fudge_p, 0);
 587
 588         error = request_threaded_irq(spi->irq, NULL, tsc2005_irq_thread,
 589                                      IRQF_TRIGGER_RISING, "tsc2005", ts);
 590         if (error) {
 591                 dev_err(&spi->dev, "Failed to request irq, err: %d\n", error);
 592                 goto err_free_mem;
 593         }
 594
 595         spi_set_drvdata(spi, ts);
 596         error = sysfs_create_group(&spi->dev.kobj, &tsc2005_attr_group);
 597         if (error) {
 598                 dev_err(&spi->dev,
 599                         "Failed to create sysfs attributes, err: %d\n", error);
 600                 goto err_clear_drvdata;
 601         }
 602
 603         error = input_register_device(ts->idev);
 604         if (error) {
 605                 dev_err(&spi->dev,
 606                         "Failed to register input device, err: %d\n", error);
 607                 goto err_remove_sysfs;
 608         }
 609
 610         tsc2005_start_scan(ts);
 611
 612         if (ts->esd_timeout && ts->set_reset) {
 613                 /* start the optional ESD watchdog */
 614                 mod_timer(&ts->esd_timer, round_jiffies(jiffies +
 615                                         msecs_to_jiffies(ts->esd_timeout)));
 616         }
 617
 618         set_irq_wake(spi->irq, 1);
 619         return 0;
 620
 621 err_remove_sysfs:
 622         sysfs_remove_group(&spi->dev.kobj, &tsc2005_attr_group);
 623 err_clear_drvdata:
 624         spi_set_drvdata(spi, NULL);
 625         free_irq(spi->irq, ts);
 626 err_free_mem:
 627         input_free_device(input_dev);
 628         kfree(ts);
 629         return error;
 630 }
 631
 632 static int __devexit tsc2005_remove(struct spi_device *spi)
 633 {
 634         struct tsc2005 *ts = spi_get_drvdata(spi);
 635
 636         sysfs_remove_group(&ts->spi->dev.kobj, &tsc2005_attr_group);
 637
 638         mutex_lock(&ts->mutex);
 639         tsc2005_disable(ts);
 640         mutex_unlock(&ts->mutex);
 641
 642         if (ts->esd_timeout)
 643                 del_timer_sync(&ts->esd_timer);
 644         del_timer_sync(&ts->penup_timer);
 645
 646         flush_work(&ts->esd_work);
 647
 648         free_irq(ts->spi->irq, ts);
 649         input_unregister_device(ts->idev);
 650         kfree(ts);
 651
 652         spi_set_drvdata(spi, NULL);
 653         return 0;
 654 }
 655
 656 #ifdef CONFIG_PM_SLEEP
 657 static int tsc2005_suspend(struct device *dev)
 658 {
 659         struct spi_device *spi = to_spi_device(dev);
 660         struct tsc2005 *ts = spi_get_drvdata(spi);
 661
 662         mutex_lock(&ts->mutex);
 663         tsc2005_disable(ts);
 664         mutex_unlock(&ts->mutex);
 665
 666         return 0;
 667 }
 668
 669 static int tsc2005_resume(struct device *dev)
 670 {
 671         struct spi_device *spi = to_spi_device(dev);
 672         struct tsc2005 *ts = spi_get_drvdata(spi);
 673
 674         mutex_lock(&ts->mutex);
 675         tsc2005_enable(ts);
 676         mutex_unlock(&ts->mutex);
 677
 678         return 0;
 679 }
 680 #endif
 681
 682 static SIMPLE_DEV_PM_OPS(tsc2005_pm_ops, tsc2005_suspend, tsc2005_resume);
 683
 684 static struct spi_driver tsc2005_driver = {
 685         .driver = {
 686                 .name   = "tsc2005",
 687                 .owner  = THIS_MODULE,
 688                 .pm     = &tsc2005_pm_ops,
 689         },
 690         .probe  = tsc2005_probe,
 691         .remove = __devexit_p(tsc2005_remove),
 692 };
 693
 694 static int __init tsc2005_init(void)
 695 {
 696         return spi_register_driver(&tsc2005_driver);
 697 }
 698 module_init(tsc2005_init);
 699
 700 static void __exit tsc2005_exit(void)
 701 {
 702         spi_unregister_driver(&tsc2005_driver);
 703 }
 704 module_exit(tsc2005_exit);
 705
 706 MODULE_AUTHOR("Lauri Leukkunen <lauri.leukkunen@nokia.com>");
 707 MODULE_DESCRIPTION("TSC2005 Touchscreen Driver");
 708 MODULE_LICENSE("GPL");