drivers/input/touchscreen/tsc2301_ts.c

   1 /*
   2  * TSC2301 touchscreen driver
   3  *
   4  * Copyright (C) 2005-2008 Nokia Corporation
   5  *
   6  * Written by Jarkko Oikarinen, Imre Deak and Juha Yrjola
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  21  *
  22  */
  23
  24 #include <linux/kernel.h>
  25 #include <linux/module.h>
  26 #include <linux/input.h>
  27 #include <linux/interrupt.h>
  28 #include <linux/delay.h>
  29 #include <linux/spi/spi.h>
  30
  31 #include <linux/spi/tsc2301.h>
  32
  33 /**
  34  * The touchscreen interface operates as follows:
  35  *
  36  * Initialize:
  37  *    Request access to GPIO103 (DAV)
  38  *    tsc2301_ts_irq_handler will trigger when DAV line goes down
  39  *
  40  *  1) Pen is pressed against touchscreeen
  41  *  2) TSC2301 performs AD conversion
  42  *  3) After the conversion is done TSC2301 drives DAV line down
  43  *  4) GPIO IRQ is received and tsc2301_ts_irq_handler is called
  44  *  5) tsc2301_ts_irq_handler queues up an spi transfer to fetch
  45  *     the x, y, z1, z2 values
  46  *  6) SPI framework calls tsc2301_ts_rx after the coordinates are read
  47  *  7) When the penup_timer expires, there have not been DAV interrupts
  48  *     during the last 20ms which means the pen has been lifted.
  49  */
  50
  51
  52 #define TSC2301_TOUCHSCREEN_PRODUCT_ID                  0x0052
  53 #define TSC2301_TOUCHSCREEN_PRODUCT_VERSION             0x0001
  54
  55 #define TSC2301_TS_PENUP_TIME                           20
  56
  57 #define TSC2301_ADCREG_CONVERSION_CTRL_BY_TSC2301       0x8000
  58 #define TSC2301_ADCREG_CONVERSION_CTRL_BY_HOST          0x0000
  59
  60 #define TSC2301_ADCREG_FUNCTION_NONE                    0x0000
  61 #define TSC2301_ADCREG_FUNCTION_XY                      0x0400
  62 #define TSC2301_ADCREG_FUNCTION_XYZ                     0x0800
  63 #define TSC2301_ADCREG_FUNCTION_X                       0x0C00
  64 #define TSC2301_ADCREG_FUNCTION_Y                       0x1000
  65 #define TSC2301_ADCREG_FUNCTION_Z                       0x1400
  66 #define TSC2301_ADCREG_FUNCTION_DAT1                    0x1800
  67 #define TSC2301_ADCREG_FUNCTION_DAT2                    0x1C00
  68 #define TSC2301_ADCREG_FUNCTION_AUX1                    0x2000
  69 #define TSC2301_ADCREG_FUNCTION_AUX2                    0x2400
  70 #define TSC2301_ADCREG_FUNCTION_TEMP                    0x2800
  71
  72 #define TSC2301_ADCREG_RESOLUTION_8BIT                  0x0100
  73 #define TSC2301_ADCREG_RESOLUTION_10BIT                 0x0200
  74 #define TSC2301_ADCREG_RESOLUTION_12BIT                 0x0300
  75
  76 #define TSC2301_ADCREG_AVERAGING_NONE                   0x0000
  77 #define TSC2301_ADCREG_AVERAGING_4AVG                   0x0040
  78 #define TSC2301_ADCREG_AVERAGING_8AVG                   0x0080
  79 #define TSC2301_ADCREG_AVERAGING_16AVG                  0x00C0
  80
  81 #define TSC2301_ADCREG_CLOCK_8MHZ                       0x0000
  82 #define TSC2301_ADCREG_CLOCK_4MHZ                       0x0010
  83 #define TSC2301_ADCREG_CLOCK_2MHZ                       0x0020
  84 #define TSC2301_ADCREG_CLOCK_1MHZ                       0x0030
  85
  86 #define TSC2301_ADCREG_VOLTAGE_STAB_0US                 0x0000
  87 #define TSC2301_ADCREG_VOLTAGE_STAB_100US               0x0002
  88 #define TSC2301_ADCREG_VOLTAGE_STAB_500US               0x0004
  89 #define TSC2301_ADCREG_VOLTAGE_STAB_1MS                 0x0006
  90 #define TSC2301_ADCREG_VOLTAGE_STAB_5MS                 0x0008
  91 #define TSC2301_ADCREG_VOLTAGE_STAB_10MS                0x000A
  92 #define TSC2301_ADCREG_VOLTAGE_STAB_50MS                0x000C
  93 #define TSC2301_ADCREG_VOLTAGE_STAB_100MS               0x000E
  94
  95 #define TSC2301_ADCREG_STOP_CONVERSION                  0x4000
  96
  97 #define MAX_12BIT                                       ((1 << 12) - 1)
  98
  99 #define TS_RECT_SIZE                                    8
 100 #define TSF_MIN_Z1                                      100
 101 #define TSF_MAX_Z2                                      4000
 102
 103 #define TSF_SAMPLES                                     4
 104
 105 struct ts_filter {
 106         int                     sample_cnt;
 107
 108         int                     avg_x;
 109         int                     avg_y;
 110         int                     avg_z1;
 111         int                     avg_z2;
 112 };
 113
 114 struct tsc2301_ts {
 115         struct input_dev        *idev;
 116         char                    phys[32];
 117         struct timer_list       penup_timer;
 118         struct mutex            mutex;
 119
 120         struct spi_transfer     read_xfer[2];
 121         struct spi_message      read_msg;
 122         u16                     data[4];
 123
 124         struct ts_filter        filter;
 125
 126         int                     hw_avg_max;
 127         u16                     x;
 128         u16                     y;
 129         u16                     p;
 130
 131         u16                     x_plate_ohm;
 132         int                     stab_time;
 133         int                     max_pressure;
 134         int                     touch_pressure;
 135
 136         u8                      event_sent;
 137         u8                      pen_down;
 138         u8                      disabled;
 139         u8                      disable_depth;
 140
 141         int                     hw_flags;
 142         int                     irq;
 143 };
 144
 145
 146 static const u16 tsc2301_ts_read_data = 0x8000 | TSC2301_REG_X;
 147
 148 static int tsc2301_ts_check_config(struct tsc2301_ts *ts, int *hw_flags)
 149 {
 150         int flags;
 151
 152         flags = 0;
 153         switch (ts->hw_avg_max) {
 154         case 0:
 155                 flags |= TSC2301_ADCREG_AVERAGING_NONE;
 156                 break;
 157         case 4:
 158                 flags |= TSC2301_ADCREG_AVERAGING_4AVG;
 159                 break;
 160         case 8:
 161                 flags |= TSC2301_ADCREG_AVERAGING_8AVG;
 162                 break;
 163         case 16:
 164                 flags |= TSC2301_ADCREG_AVERAGING_16AVG;
 165                 break;
 166         default:
 167                 return -EINVAL;
 168         }
 169
 170         switch (ts->stab_time) {
 171         case 0:
 172                 flags |= TSC2301_ADCREG_VOLTAGE_STAB_0US;
 173                 break;
 174         case 100:
 175                 flags |= TSC2301_ADCREG_VOLTAGE_STAB_100US;
 176                 break;
 177         case 500:
 178                 flags |= TSC2301_ADCREG_VOLTAGE_STAB_500US;
 179                 break;
 180         case 1000:
 181                 flags |= TSC2301_ADCREG_VOLTAGE_STAB_1MS;
 182                 break;
 183         case 5000:
 184                 flags |= TSC2301_ADCREG_VOLTAGE_STAB_5MS;
 185                 break;
 186         case 10000:
 187                 flags |= TSC2301_ADCREG_VOLTAGE_STAB_10MS;
 188                 break;
 189         case 50000:
 190                 flags |= TSC2301_ADCREG_VOLTAGE_STAB_50MS;
 191                 break;
 192         case 100000:
 193                 flags |= TSC2301_ADCREG_VOLTAGE_STAB_100MS;
 194                 break;
 195         default:
 196                 return -EINVAL;
 197         }
 198
 199         *hw_flags = flags;
 200         return 0;
 201 }
 202
 203 /*
 204  * This odd three-time initialization is to work around a bug in TSC2301.
 205  * See TSC2301 errata for details.
 206  */
 207 static int tsc2301_ts_configure(struct tsc2301 *tsc, int flags)
 208 {
 209         struct spi_transfer xfer[5];
 210         struct spi_transfer *x;
 211         struct spi_message m;
 212         int i;
 213         u16 val1, val2, val3;
 214         u16 data[10];
 215
 216         val1 = TSC2301_ADCREG_CONVERSION_CTRL_BY_HOST |
 217                 TSC2301_ADCREG_STOP_CONVERSION |
 218                 TSC2301_ADCREG_FUNCTION_NONE |
 219                 TSC2301_ADCREG_RESOLUTION_12BIT |
 220                 TSC2301_ADCREG_AVERAGING_NONE |
 221                 TSC2301_ADCREG_CLOCK_2MHZ |
 222                 TSC2301_ADCREG_VOLTAGE_STAB_100MS;
 223
 224         val2 = TSC2301_ADCREG_CONVERSION_CTRL_BY_HOST |
 225                 TSC2301_ADCREG_FUNCTION_XYZ |
 226                 TSC2301_ADCREG_RESOLUTION_12BIT |
 227                 TSC2301_ADCREG_AVERAGING_16AVG |
 228                 TSC2301_ADCREG_CLOCK_1MHZ |
 229                 TSC2301_ADCREG_VOLTAGE_STAB_100MS;
 230
 231         /* Averaging and voltage stabilization settings in flags */
 232         val3 = TSC2301_ADCREG_CONVERSION_CTRL_BY_TSC2301 |
 233                 TSC2301_ADCREG_FUNCTION_XYZ |
 234                 TSC2301_ADCREG_RESOLUTION_12BIT |
 235                 TSC2301_ADCREG_CLOCK_2MHZ |
 236                 flags;
 237
 238         /* Now we prepare the command for transferring */
 239         data[0] = TSC2301_REG_ADC;
 240         data[1] = val1;
 241         data[2] = TSC2301_REG_ADC;
 242         data[3] = val2;
 243         data[4] = TSC2301_REG_ADC;
 244         data[5] = val3;
 245         data[6] = TSC2301_REG_REF;
 246         data[7] = 1 << 4 | 1 << 2 | 1; /* intref, 100uS settl, 2.5V ref */
 247         data[8] = TSC2301_REG_CONFIG;
 248         data[9] = 3 << 3 | 2 << 0; /* 340uS pre-chrg, 544us delay */
 249
 250         spi_message_init(&m);
 251         m.spi = tsc->spi;
 252
 253         memset(xfer, 0, sizeof(xfer));
 254         x = &xfer[0];
 255
 256         for (i = 0; i < 10; i += 2) {
 257                 x->tx_buf = &data[i];
 258                 x->len = 4;
 259                 if (i != 8)
 260                         x->cs_change = 1;
 261                 spi_message_add_tail(x, &m);
 262                 x++;
 263         }
 264         spi_sync(m.spi, &m);
 265
 266         return 0;
 267 }
 268
 269 static void tsc2301_ts_start_scan(struct tsc2301 *tsc)
 270 {
 271         tsc2301_ts_configure(tsc, tsc->ts->hw_flags);
 272         tsc2301_kp_restart(tsc);
 273 }
 274
 275 static void tsc2301_ts_stop_scan(struct tsc2301 *tsc)
 276 {
 277         tsc2301_write_reg(tsc, TSC2301_REG_ADC, TSC2301_ADCREG_STOP_CONVERSION);
 278         tsc2301_kp_restart(tsc);
 279 }
 280
 281 static void update_pen_state(struct tsc2301_ts *ts, int x, int y, int pressure)
 282 {
 283         if (pressure) {
 284                 input_report_abs(ts->idev, ABS_X, x);
 285                 input_report_abs(ts->idev, ABS_Y, y);
 286                 input_report_abs(ts->idev, ABS_PRESSURE, pressure);
 287                 if (!ts->pen_down)
 288                         input_report_key(ts->idev, BTN_TOUCH, 1);
 289                 ts->pen_down = 1;
 290         } else {
 291                 input_report_abs(ts->idev, ABS_PRESSURE, 0);
 292                 if (ts->pen_down)
 293                         input_report_key(ts->idev, BTN_TOUCH, 0);
 294                 ts->pen_down = 0;
 295         }
 296
 297         input_sync(ts->idev);
 298
 299 #ifdef VERBOSE
 300         dev_dbg(&tsc->spi->dev, "x %4d y %4d p %4d\n", x, y, pressure);
 301 #endif
 302 }
 303
 304 static int filter(struct tsc2301_ts *ts, int x, int y, int z1, int z2)
 305 {
 306         int inside_rect, pressure_limit, Rt;
 307         struct ts_filter *tsf = &ts->filter;
 308
 309         /* validate pressure and position */
 310         if (x > MAX_12BIT || y > MAX_12BIT)
 311                 return 0;
 312
 313         /* skip coords if the pressure-components are out of range */
 314         if (z1 < TSF_MIN_Z1 || z2 > TSF_MAX_Z2)
 315                 return 0;
 316
 317         /* Use the x,y,z1,z2 directly on the first "pen down" event */
 318         if (ts->event_sent) {
 319                 tsf->avg_x  += x;
 320                 tsf->avg_y  += y;
 321                 tsf->avg_z1 += z1;
 322                 tsf->avg_z2 += z2;
 323
 324                 if (++tsf->sample_cnt < TSF_SAMPLES)
 325                         return 0;
 326                 x = tsf->avg_x / TSF_SAMPLES;
 327                 y = tsf->avg_y / TSF_SAMPLES;
 328                 z1 = tsf->avg_z1 / TSF_SAMPLES;
 329                 z2 = tsf->avg_z2 / TSF_SAMPLES;
 330         }
 331         tsf->sample_cnt = 0;
 332         tsf->avg_x  = 0;
 333         tsf->avg_y  = 0;
 334         tsf->avg_z1 = 0;
 335         tsf->avg_z2 = 0;
 336
 337         pressure_limit = ts->event_sent? ts->max_pressure: ts->touch_pressure;
 338
 339         /* z1 is always at least 100: */
 340         Rt = x * (z2 - z1) / z1;
 341         Rt = Rt * ts->x_plate_ohm / 4096;
 342         if (Rt > pressure_limit)
 343                 return 0;
 344
 345         /* discard the event if it still is within the previous rect - unless
 346          * if the pressure is harder, but then use previous x,y position */
 347         inside_rect = (
 348             x > (int)ts->x - TS_RECT_SIZE && x < (int)ts->x + TS_RECT_SIZE &&
 349             y > (int)ts->y - TS_RECT_SIZE && y < (int)ts->y + TS_RECT_SIZE);
 350
 351         if (!ts->event_sent || !inside_rect) {
 352                 ts->x = x;
 353                 ts->y = y;
 354                 ts->p = Rt;
 355                 return 1;
 356         } else if (Rt < ts->p) {
 357                 ts->p = Rt;
 358                 return 1;
 359         }
 360         return 0;
 361 }
 362
 363 /*
 364  * This procedure is called by the SPI framework after the coordinates
 365  * have been read from TSC2301
 366  */
 367 static void tsc2301_ts_rx(void *arg)
 368 {
 369         struct tsc2301 *tsc = arg;
 370         struct tsc2301_ts *ts = tsc->ts;
 371         int send_event;
 372         int x, y, z1, z2;
 373
 374         x  = ts->data[0];
 375         y  = ts->data[1];
 376         z1 = ts->data[2];
 377         z2 = ts->data[3];
 378
 379         send_event = filter(ts, x, y, z1, z2);
 380         if (send_event) {
 381                 update_pen_state(ts, ts->x, ts->y, ts->p);
 382                 ts->event_sent = 1;
 383         }
 384
 385         mod_timer(&ts->penup_timer,
 386                   jiffies + msecs_to_jiffies(TSC2301_TS_PENUP_TIME));
 387 }
 388
 389 /*
 390  * Timer is called TSC2301_TS_PENUP_TIME after pen is up
 391  */
 392 static void tsc2301_ts_timer_handler(unsigned long data)
 393 {
 394         struct tsc2301 *tsc = (struct tsc2301 *)data;
 395         struct tsc2301_ts *ts = tsc->ts;
 396
 397         if (ts->event_sent) {
 398                 ts->event_sent = 0;
 399                 update_pen_state(ts, 0, 0, 0);
 400         }
 401 }
 402
 403 /*
 404  * This interrupt is called when pen is down and coordinates are
 405  * available. That is indicated by a falling edge on DEV line.
 406  */
 407 static irqreturn_t tsc2301_ts_irq_handler(int irq, void *dev_id)
 408 {
 409         struct tsc2301 *tsc = dev_id;
 410         struct tsc2301_ts *ts = tsc->ts;
 411         int r;
 412
 413         r = spi_async(tsc->spi, &ts->read_msg);
 414         if (r)
 415                 dev_err(&tsc->spi->dev, "ts: spi_async() failed");
 416
 417         mod_timer(&ts->penup_timer,
 418                   jiffies + msecs_to_jiffies(TSC2301_TS_PENUP_TIME));
 419
 420         return IRQ_HANDLED;
 421 }
 422
 423 static void tsc2301_ts_disable(struct tsc2301 *tsc)
 424 {
 425         struct tsc2301_ts *ts = tsc->ts;
 426
 427         if (ts->disable_depth++ != 0)
 428                 return;
 429
 430         disable_irq(ts->irq);
 431
 432         /* wait until penup timer expire normally */
 433         do {
 434                 msleep(1);
 435         } while (ts->event_sent);
 436
 437         tsc2301_ts_stop_scan(tsc);
 438 }
 439
 440 static void tsc2301_ts_enable(struct tsc2301 *tsc)
 441 {
 442         struct tsc2301_ts *ts = tsc->ts;
 443
 444         if (--ts->disable_depth != 0)
 445                 return;
 446
 447         enable_irq(ts->irq);
 448
 449         tsc2301_ts_start_scan(tsc);
 450 }
 451
 452 #ifdef CONFIG_PM
 453 int tsc2301_ts_suspend(struct tsc2301 *tsc)
 454 {
 455         struct tsc2301_ts *ts = tsc->ts;
 456
 457         mutex_lock(&ts->mutex);
 458         tsc2301_ts_disable(tsc);
 459         mutex_unlock(&ts->mutex);
 460
 461         return 0;
 462 }
 463
 464 void tsc2301_ts_resume(struct tsc2301 *tsc)
 465 {
 466         struct tsc2301_ts *ts = tsc->ts;
 467
 468         mutex_lock(&ts->mutex);
 469         tsc2301_ts_enable(tsc);
 470         mutex_unlock(&ts->mutex);
 471 }
 472 #endif
 473
 474 static void tsc2301_ts_setup_spi_xfer(struct tsc2301 *tsc)
 475 {
 476         struct tsc2301_ts *ts = tsc->ts;
 477         struct spi_message *m = &ts->read_msg;
 478         struct spi_transfer *x = &ts->read_xfer[0];
 479
 480         spi_message_init(m);
 481
 482         x->tx_buf = &tsc2301_ts_read_data;
 483         x->len = 2;
 484         spi_message_add_tail(x, m);
 485
 486         x++;
 487         x->rx_buf = &ts->data;
 488         x->len = 8;
 489         spi_message_add_tail(x, m);
 490
 491         m->complete = tsc2301_ts_rx;
 492         m->context = tsc;
 493 }
 494
 495 static ssize_t tsc2301_ts_pen_down_show(struct device *dev,
 496                                         struct device_attribute *attr,
 497                                         char *buf)
 498 {
 499         struct tsc2301 *tsc = dev_get_drvdata(dev);
 500
 501         return sprintf(buf, "%u\n", tsc->ts->pen_down);
 502 }
 503
 504 static DEVICE_ATTR(pen_down, S_IRUGO, tsc2301_ts_pen_down_show, NULL);
 505
 506 static ssize_t tsc2301_ts_disable_show(struct device *dev,
 507                                        struct device_attribute *attr, char *buf)
 508 {
 509         struct tsc2301          *tsc = dev_get_drvdata(dev);
 510         struct tsc2301_ts       *ts = tsc->ts;
 511
 512         return sprintf(buf, "%u\n", ts->disabled);
 513 }
 514
 515 static ssize_t tsc2301_ts_disable_store(struct device *dev,
 516                                         struct device_attribute *attr,
 517                                         const char *buf, size_t count)
 518 {
 519         struct tsc2301          *tsc = dev_get_drvdata(dev);
 520         struct tsc2301_ts       *ts = tsc->ts;
 521         char *endp;
 522         int i;
 523
 524         i = simple_strtoul(buf, &endp, 10);
 525         i = i ? 1 : 0;
 526         mutex_lock(&ts->mutex);
 527         if (i == ts->disabled) goto out;
 528         ts->disabled = i;
 529
 530         if (i)
 531                 tsc2301_ts_disable(tsc);
 532         else
 533                 tsc2301_ts_enable(tsc);
 534 out:
 535         mutex_unlock(&ts->mutex);
 536         return count;
 537 }
 538
 539 static DEVICE_ATTR(disable_ts, 0664, tsc2301_ts_disable_show,
 540                    tsc2301_ts_disable_store);
 541
 542 int __devinit tsc2301_ts_init(struct tsc2301 *tsc,
 543                               struct tsc2301_platform_data *pdata)
 544 {
 545         struct tsc2301_ts *ts;
 546         struct input_dev *idev;
 547         int r;
 548         int x_max, y_max;
 549         int x_fudge, y_fudge, p_fudge;
 550
 551         if (pdata->dav_int <= 0) {
 552                 dev_err(&tsc->spi->dev, "need DAV IRQ");
 553                 return -EINVAL;
 554         }
 555
 556         ts = kzalloc(sizeof(*ts), GFP_KERNEL);
 557         if (ts == NULL)
 558                 return -ENOMEM;
 559         tsc->ts = ts;
 560
 561         ts->irq = pdata->dav_int;
 562
 563         init_timer(&ts->penup_timer);
 564         setup_timer(&ts->penup_timer, tsc2301_ts_timer_handler,
 565                         (unsigned long)tsc);
 566
 567         mutex_init(&ts->mutex);
 568
 569         ts->x_plate_ohm = pdata->ts_x_plate_ohm ? : 280;
 570         ts->hw_avg_max  = pdata->ts_hw_avg;
 571         ts->max_pressure = pdata->ts_max_pressure ? : MAX_12BIT;
 572         ts->touch_pressure = pdata->ts_touch_pressure ? : ts->max_pressure;
 573         ts->stab_time   = pdata->ts_stab_time;
 574
 575         x_max           = pdata->ts_x_max ? : 4096;
 576         y_max           = pdata->ts_y_max ? : 4096;
 577         x_fudge         = pdata->ts_x_fudge ? : 4;
 578         y_fudge         = pdata->ts_y_fudge ? : 8;
 579         p_fudge         = pdata->ts_pressure_fudge ? : 2;
 580
 581         if ((r = tsc2301_ts_check_config(ts, &ts->hw_flags))) {
 582                 dev_err(&tsc->spi->dev, "invalid configuration\n");
 583                 goto err2;
 584         }
 585
 586         idev = input_allocate_device();
 587         if (idev == NULL) {
 588                 r = -ENOMEM;
 589                 goto err2;
 590         }
 591         idev->name = "TSC2301 touchscreen";
 592         snprintf(ts->phys, sizeof(ts->phys),
 593                  "%s/input-ts", tsc->spi->dev.bus_id);
 594         idev->phys = ts->phys;
 595         idev->dev.parent = &tsc->spi->dev;
 596
 597         idev->evbit[0] = BIT(EV_ABS) | BIT(EV_KEY);
 598         idev->absbit[0] = BIT(ABS_X) | BIT(ABS_Y) | BIT(ABS_PRESSURE);
 599         ts->idev = idev;
 600
 601         tsc2301_ts_setup_spi_xfer(tsc);
 602
 603         /* These parameters should perhaps be configurable? */
 604         input_set_abs_params(idev, ABS_X, 0, x_max, x_fudge, 0);
 605         input_set_abs_params(idev, ABS_Y, 0, y_max, y_fudge, 0);
 606         input_set_abs_params(idev, ABS_PRESSURE, 0, ts->max_pressure,
 607                              p_fudge, 0);
 608
 609         tsc2301_ts_start_scan(tsc);
 610
 611         r = request_irq(ts->irq, tsc2301_ts_irq_handler,
 612                         IRQF_SAMPLE_RANDOM | IRQF_TRIGGER_FALLING,
 613                         "tsc2301-ts", tsc);
 614         if (r < 0) {
 615                 dev_err(&tsc->spi->dev, "unable to get DAV IRQ");
 616                 goto err3;
 617         }
 618         set_irq_wake(ts->irq, 1);
 619
 620         if (device_create_file(&tsc->spi->dev, &dev_attr_pen_down) < 0)
 621                 goto err4;
 622         if (device_create_file(&tsc->spi->dev, &dev_attr_disable_ts) < 0)
 623                 goto err5;
 624
 625         r = input_register_device(idev);
 626         if (r < 0) {
 627                 dev_err(&tsc->spi->dev, "can't register touchscreen device\n");
 628                 goto err6;
 629         }
 630
 631         return 0;
 632 err6:
 633         device_remove_file(&tsc->spi->dev, &dev_attr_disable_ts);
 634 err5:
 635         device_remove_file(&tsc->spi->dev, &dev_attr_pen_down);
 636 err4:
 637         free_irq(ts->irq, tsc);
 638 err3:
 639         tsc2301_ts_stop_scan(tsc);
 640         input_free_device(idev);
 641 err2:
 642         kfree(ts);
 643         return r;
 644 }
 645
 646 void __devexit tsc2301_ts_exit(struct tsc2301 *tsc)
 647 {
 648         struct tsc2301_ts *ts = tsc->ts;
 649
 650         tsc2301_ts_disable(tsc);
 651
 652         device_remove_file(&tsc->spi->dev, &dev_attr_disable_ts);
 653         device_remove_file(&tsc->spi->dev, &dev_attr_pen_down);
 654
 655         free_irq(ts->irq, tsc);
 656         input_unregister_device(ts->idev);
 657
 658         kfree(ts);
 659 }
 660 MODULE_AUTHOR("Jarkko Oikarinen <jarkko.oikarinen@nokia.com>");
 661 MODULE_LICENSE("GPL");