drivers/input/touchscreen/tsc2005.c

   1 /*
   2  * TSC2005 touchscreen driver
   3  *
   4  * Copyright (C) 2006-2010 Nokia Corporation
   5  *
   6  * Author: Lauri Leukkunen <lauri.leukkunen@nokia.com>
   7  * based on TSC2301 driver by Klaus K. Pedersen <klaus.k.pedersen@nokia.com>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  22  *
  23  */
  24
  25 #include <linux/kernel.h>
  26 #include <linux/module.h>
  27 #include <linux/input.h>
  28 #include <linux/input/touchscreen.h>
  29 #include <linux/interrupt.h>
  30 #include <linux/delay.h>
  31 #include <linux/pm.h>
  32 #include <linux/of.h>
  33 #include <linux/of_gpio.h>
  34 #include <linux/spi/spi.h>
  35 #include <linux/spi/tsc2005.h>
  36 #include <linux/regulator/consumer.h>
  37 #include <linux/regmap.h>
  38
  39 /*
  40  * The touchscreen interface operates as follows:
  41  *
  42  * 1) Pen is pressed against the touchscreen.
  43  * 2) TSC2005 performs AD conversion.
  44  * 3) After the conversion is done TSC2005 drives DAV line down.
  45  * 4) GPIO IRQ is received and tsc2005_irq_thread() is scheduled.
  46  * 5) tsc2005_irq_thread() queues up an spi transfer to fetch the x, y, z1, z2
  47  *    values.
  48  * 6) tsc2005_irq_thread() reports coordinates to input layer and sets up
  49  *    tsc2005_penup_timer() to be called after TSC2005_PENUP_TIME_MS (40ms).
  50  * 7) When the penup timer expires, there have not been touch or DAV interrupts
  51  *    during the last 40ms which means the pen has been lifted.
  52  *
  53  * ESD recovery via a hardware reset is done if the TSC2005 doesn't respond
  54  * after a configurable period (in ms) of activity. If esd_timeout is 0, the
  55  * watchdog is disabled.
  56  */
  57
  58 /* control byte 1 */
  59 #define TSC2005_CMD                     0x80
  60 #define TSC2005_CMD_NORMAL              0x00
  61 #define TSC2005_CMD_STOP                0x01
  62 #define TSC2005_CMD_12BIT               0x04
  63
  64 /* control byte 0 */
  65 #define TSC2005_REG_READ                0x01 /* R/W access */
  66 #define TSC2005_REG_PND0                0x02 /* Power Not Down Control */
  67 #define TSC2005_REG_X                   (0x0 << 3)
  68 #define TSC2005_REG_Y                   (0x1 << 3)
  69 #define TSC2005_REG_Z1                  (0x2 << 3)
  70 #define TSC2005_REG_Z2                  (0x3 << 3)
  71 #define TSC2005_REG_AUX                 (0x4 << 3)
  72 #define TSC2005_REG_TEMP1               (0x5 << 3)
  73 #define TSC2005_REG_TEMP2               (0x6 << 3)
  74 #define TSC2005_REG_STATUS              (0x7 << 3)
  75 #define TSC2005_REG_AUX_HIGH            (0x8 << 3)
  76 #define TSC2005_REG_AUX_LOW             (0x9 << 3)
  77 #define TSC2005_REG_TEMP_HIGH           (0xA << 3)
  78 #define TSC2005_REG_TEMP_LOW            (0xB << 3)
  79 #define TSC2005_REG_CFR0                (0xC << 3)
  80 #define TSC2005_REG_CFR1                (0xD << 3)
  81 #define TSC2005_REG_CFR2                (0xE << 3)
  82 #define TSC2005_REG_CONV_FUNC           (0xF << 3)
  83
  84 /* configuration register 0 */
  85 #define TSC2005_CFR0_PRECHARGE_276US    0x0040
  86 #define TSC2005_CFR0_STABTIME_1MS       0x0300
  87 #define TSC2005_CFR0_CLOCK_1MHZ         0x1000
  88 #define TSC2005_CFR0_RESOLUTION12       0x2000
  89 #define TSC2005_CFR0_PENMODE            0x8000
  90 #define TSC2005_CFR0_INITVALUE          (TSC2005_CFR0_STABTIME_1MS    | \
  91                                          TSC2005_CFR0_CLOCK_1MHZ      | \
  92                                          TSC2005_CFR0_RESOLUTION12    | \
  93                                          TSC2005_CFR0_PRECHARGE_276US | \
  94                                          TSC2005_CFR0_PENMODE)
  95
  96 /* bits common to both read and write of configuration register 0 */
  97 #define TSC2005_CFR0_RW_MASK            0x3fff
  98
  99 /* configuration register 1 */
 100 #define TSC2005_CFR1_BATCHDELAY_4MS     0x0003
 101 #define TSC2005_CFR1_INITVALUE          TSC2005_CFR1_BATCHDELAY_4MS
 102
 103 /* configuration register 2 */
 104 #define TSC2005_CFR2_MAVE_Z             0x0004
 105 #define TSC2005_CFR2_MAVE_Y             0x0008
 106 #define TSC2005_CFR2_MAVE_X             0x0010
 107 #define TSC2005_CFR2_AVG_7              0x0800
 108 #define TSC2005_CFR2_MEDIUM_15          0x3000
 109 #define TSC2005_CFR2_INITVALUE          (TSC2005_CFR2_MAVE_X    | \
 110                                          TSC2005_CFR2_MAVE_Y    | \
 111                                          TSC2005_CFR2_MAVE_Z    | \
 112                                          TSC2005_CFR2_MEDIUM_15 | \
 113                                          TSC2005_CFR2_AVG_7)
 114
 115 #define MAX_12BIT                       0xfff
 116 #define TSC2005_DEF_X_FUZZ              4
 117 #define TSC2005_DEF_Y_FUZZ              8
 118 #define TSC2005_DEF_P_FUZZ              2
 119 #define TSC2005_DEF_RESISTOR            280
 120
 121 #define TSC2005_SPI_MAX_SPEED_HZ        10000000
 122 #define TSC2005_PENUP_TIME_MS           40
 123
 124 static const struct regmap_range tsc2005_writable_ranges[] = {
 125         regmap_reg_range(TSC2005_REG_AUX_HIGH, TSC2005_REG_CFR2),
 126 };
 127
 128 static const struct regmap_access_table tsc2005_writable_table = {
 129         .yes_ranges = tsc2005_writable_ranges,
 130         .n_yes_ranges = ARRAY_SIZE(tsc2005_writable_ranges),
 131 };
 132
 133 static struct regmap_config tsc2005_regmap_config = {
 134         .reg_bits = 8,
 135         .val_bits = 16,
 136         .reg_stride = 0x08,
 137         .max_register = 0x78,
 138         .read_flag_mask = TSC2005_REG_READ,
 139         .write_flag_mask = TSC2005_REG_PND0,
 140         .wr_table = &tsc2005_writable_table,
 141         .use_single_rw = true,
 142 };
 143
 144 struct tsc2005_data {
 145         u16 x;
 146         u16 y;
 147         u16 z1;
 148         u16 z2;
 149 } __packed;
 150 #define TSC2005_DATA_REGS 4
 151
 152 struct tsc2005 {
 153         struct spi_device       *spi;
 154         struct regmap           *regmap;
 155
 156         struct input_dev        *idev;
 157         char                    phys[32];
 158
 159         struct mutex            mutex;
 160
 161         /* raw copy of previous x,y,z */
 162         int                     in_x;
 163         int                     in_y;
 164         int                     in_z1;
 165         int                     in_z2;
 166
 167         spinlock_t              lock;
 168         struct timer_list       penup_timer;
 169
 170         unsigned int            esd_timeout;
 171         struct delayed_work     esd_work;
 172         unsigned long           last_valid_interrupt;
 173
 174         unsigned int            x_plate_ohm;
 175
 176         bool                    opened;
 177         bool                    suspended;
 178
 179         bool                    pen_down;
 180
 181         struct regulator        *vio;
 182
 183         int                     reset_gpio;
 184         void                    (*set_reset)(bool enable);
 185 };
 186
 187 static int tsc2005_cmd(struct tsc2005 *ts, u8 cmd)
 188 {
 189         u8 tx = TSC2005_CMD | TSC2005_CMD_12BIT | cmd;
 190         struct spi_transfer xfer = {
 191                 .tx_buf         = &tx,
 192                 .len            = 1,
 193                 .bits_per_word  = 8,
 194         };
 195         struct spi_message msg;
 196         int error;
 197
 198         spi_message_init(&msg);
 199         spi_message_add_tail(&xfer, &msg);
 200
 201         error = spi_sync(ts->spi, &msg);
 202         if (error) {
 203                 dev_err(&ts->spi->dev, "%s: failed, command: %x, error: %d\n",
 204                         __func__, cmd, error);
 205                 return error;
 206         }
 207
 208         return 0;
 209 }
 210
 211 static void tsc2005_update_pen_state(struct tsc2005 *ts,
 212                                      int x, int y, int pressure)
 213 {
 214         if (pressure) {
 215                 input_report_abs(ts->idev, ABS_X, x);
 216                 input_report_abs(ts->idev, ABS_Y, y);
 217                 input_report_abs(ts->idev, ABS_PRESSURE, pressure);
 218                 if (!ts->pen_down) {
 219                         input_report_key(ts->idev, BTN_TOUCH, !!pressure);
 220                         ts->pen_down = true;
 221                 }
 222         } else {
 223                 input_report_abs(ts->idev, ABS_PRESSURE, 0);
 224                 if (ts->pen_down) {
 225                         input_report_key(ts->idev, BTN_TOUCH, 0);
 226                         ts->pen_down = false;
 227                 }
 228         }
 229         input_sync(ts->idev);
 230         dev_dbg(&ts->spi->dev, "point(%4d,%4d), pressure (%4d)\n", x, y,
 231                 pressure);
 232 }
 233
 234 static irqreturn_t tsc2005_irq_thread(int irq, void *_ts)
 235 {
 236         struct tsc2005 *ts = _ts;
 237         unsigned long flags;
 238         unsigned int pressure;
 239         struct tsc2005_data tsdata;
 240         int error;
 241
 242         /* read the coordinates */
 243         error = regmap_bulk_read(ts->regmap, TSC2005_REG_X, &tsdata,
 244                                  TSC2005_DATA_REGS);
 245         if (unlikely(error))
 246                 goto out;
 247
 248         /* validate position */
 249         if (unlikely(tsdata.x > MAX_12BIT || tsdata.y > MAX_12BIT))
 250                 goto out;
 251
 252         /* Skip reading if the pressure components are out of range */
 253         if (unlikely(tsdata.z1 == 0 || tsdata.z2 > MAX_12BIT))
 254                 goto out;
 255         if (unlikely(tsdata.z1 >= tsdata.z2))
 256                 goto out;
 257
 258        /*
 259         * Skip point if this is a pen down with the exact same values as
 260         * the value before pen-up - that implies SPI fed us stale data
 261         */
 262         if (!ts->pen_down &&
 263             ts->in_x == tsdata.x && ts->in_y == tsdata.y &&
 264             ts->in_z1 == tsdata.z1 && ts->in_z2 == tsdata.z2) {
 265                 goto out;
 266         }
 267
 268         /*
 269          * At this point we are happy we have a valid and useful reading.
 270          * Remember it for later comparisons. We may now begin downsampling.
 271          */
 272         ts->in_x = tsdata.x;
 273         ts->in_y = tsdata.y;
 274         ts->in_z1 = tsdata.z1;
 275         ts->in_z2 = tsdata.z2;
 276
 277         /* Compute touch pressure resistance using equation #1 */
 278         pressure = tsdata.x * (tsdata.z2 - tsdata.z1) / tsdata.z1;
 279         pressure = pressure * ts->x_plate_ohm / 4096;
 280         if (unlikely(pressure > MAX_12BIT))
 281                 goto out;
 282
 283         spin_lock_irqsave(&ts->lock, flags);
 284
 285         tsc2005_update_pen_state(ts, tsdata.x, tsdata.y, pressure);
 286         mod_timer(&ts->penup_timer,
 287                   jiffies + msecs_to_jiffies(TSC2005_PENUP_TIME_MS));
 288
 289         spin_unlock_irqrestore(&ts->lock, flags);
 290
 291         ts->last_valid_interrupt = jiffies;
 292 out:
 293         return IRQ_HANDLED;
 294 }
 295
 296 static void tsc2005_penup_timer(unsigned long data)
 297 {
 298         struct tsc2005 *ts = (struct tsc2005 *)data;
 299         unsigned long flags;
 300
 301         spin_lock_irqsave(&ts->lock, flags);
 302         tsc2005_update_pen_state(ts, 0, 0, 0);
 303         spin_unlock_irqrestore(&ts->lock, flags);
 304 }
 305
 306 static void tsc2005_start_scan(struct tsc2005 *ts)
 307 {
 308         regmap_write(ts->regmap, TSC2005_REG_CFR0, TSC2005_CFR0_INITVALUE);
 309         regmap_write(ts->regmap, TSC2005_REG_CFR1, TSC2005_CFR1_INITVALUE);
 310         regmap_write(ts->regmap, TSC2005_REG_CFR2, TSC2005_CFR2_INITVALUE);
 311         tsc2005_cmd(ts, TSC2005_CMD_NORMAL);
 312 }
 313
 314 static void tsc2005_stop_scan(struct tsc2005 *ts)
 315 {
 316         tsc2005_cmd(ts, TSC2005_CMD_STOP);
 317 }
 318
 319 static void tsc2005_set_reset(struct tsc2005 *ts, bool enable)
 320 {
 321         if (ts->reset_gpio >= 0)
 322                 gpio_set_value(ts->reset_gpio, enable);
 323         else if (ts->set_reset)
 324                 ts->set_reset(enable);
 325 }
 326
 327 /* must be called with ts->mutex held */
 328 static void __tsc2005_disable(struct tsc2005 *ts)
 329 {
 330         tsc2005_stop_scan(ts);
 331
 332         disable_irq(ts->spi->irq);
 333         del_timer_sync(&ts->penup_timer);
 334
 335         cancel_delayed_work_sync(&ts->esd_work);
 336
 337         enable_irq(ts->spi->irq);
 338 }
 339
 340 /* must be called with ts->mutex held */
 341 static void __tsc2005_enable(struct tsc2005 *ts)
 342 {
 343         tsc2005_start_scan(ts);
 344
 345         if (ts->esd_timeout && (ts->set_reset || ts->reset_gpio)) {
 346                 ts->last_valid_interrupt = jiffies;
 347                 schedule_delayed_work(&ts->esd_work,
 348                                 round_jiffies_relative(
 349                                         msecs_to_jiffies(ts->esd_timeout)));
 350         }
 351
 352 }
 353
 354 static ssize_t tsc2005_selftest_show(struct device *dev,
 355                                      struct device_attribute *attr,
 356                                      char *buf)
 357 {
 358         struct spi_device *spi = to_spi_device(dev);
 359         struct tsc2005 *ts = spi_get_drvdata(spi);
 360         unsigned int temp_high;
 361         unsigned int temp_high_orig;
 362         unsigned int temp_high_test;
 363         bool success = true;
 364         int error;
 365
 366         mutex_lock(&ts->mutex);
 367
 368         /*
 369          * Test TSC2005 communications via temp high register.
 370          */
 371         __tsc2005_disable(ts);
 372
 373         error = regmap_read(ts->regmap, TSC2005_REG_TEMP_HIGH, &temp_high_orig);
 374         if (error) {
 375                 dev_warn(dev, "selftest failed: read error %d\n", error);
 376                 success = false;
 377                 goto out;
 378         }
 379
 380         temp_high_test = (temp_high_orig - 1) & MAX_12BIT;
 381
 382         error = regmap_write(ts->regmap, TSC2005_REG_TEMP_HIGH, temp_high_test);
 383         if (error) {
 384                 dev_warn(dev, "selftest failed: write error %d\n", error);
 385                 success = false;
 386                 goto out;
 387         }
 388
 389         error = regmap_read(ts->regmap, TSC2005_REG_TEMP_HIGH, &temp_high);
 390         if (error) {
 391                 dev_warn(dev, "selftest failed: read error %d after write\n",
 392                          error);
 393                 success = false;
 394                 goto out;
 395         }
 396
 397         if (temp_high != temp_high_test) {
 398                 dev_warn(dev, "selftest failed: %d != %d\n",
 399                          temp_high, temp_high_test);
 400                 success = false;
 401         }
 402
 403         /* hardware reset */
 404         tsc2005_set_reset(ts, false);
 405         usleep_range(100, 500); /* only 10us required */
 406         tsc2005_set_reset(ts, true);
 407
 408         if (!success)
 409                 goto out;
 410
 411         /* test that the reset really happened */
 412         error = regmap_read(ts->regmap, TSC2005_REG_TEMP_HIGH, &temp_high);
 413         if (error) {
 414                 dev_warn(dev, "selftest failed: read error %d after reset\n",
 415                          error);
 416                 success = false;
 417                 goto out;
 418         }
 419
 420         if (temp_high != temp_high_orig) {
 421                 dev_warn(dev, "selftest failed after reset: %d != %d\n",
 422                          temp_high, temp_high_orig);
 423                 success = false;
 424         }
 425
 426 out:
 427         __tsc2005_enable(ts);
 428         mutex_unlock(&ts->mutex);
 429
 430         return sprintf(buf, "%d\n", success);
 431 }
 432
 433 static DEVICE_ATTR(selftest, S_IRUGO, tsc2005_selftest_show, NULL);
 434
 435 static struct attribute *tsc2005_attrs[] = {
 436         &dev_attr_selftest.attr,
 437         NULL
 438 };
 439
 440 static umode_t tsc2005_attr_is_visible(struct kobject *kobj,
 441                                       struct attribute *attr, int n)
 442 {
 443         struct device *dev = container_of(kobj, struct device, kobj);
 444         struct spi_device *spi = to_spi_device(dev);
 445         struct tsc2005 *ts = spi_get_drvdata(spi);
 446         umode_t mode = attr->mode;
 447
 448         if (attr == &dev_attr_selftest.attr) {
 449                 if (!ts->set_reset && !ts->reset_gpio)
 450                         mode = 0;
 451         }
 452
 453         return mode;
 454 }
 455
 456 static const struct attribute_group tsc2005_attr_group = {
 457         .is_visible     = tsc2005_attr_is_visible,
 458         .attrs          = tsc2005_attrs,
 459 };
 460
 461 static void tsc2005_esd_work(struct work_struct *work)
 462 {
 463         struct tsc2005 *ts = container_of(work, struct tsc2005, esd_work.work);
 464         int error;
 465         unsigned int r;
 466
 467         if (!mutex_trylock(&ts->mutex)) {
 468                 /*
 469                  * If the mutex is taken, it means that disable or enable is in
 470                  * progress. In that case just reschedule the work. If the work
 471                  * is not needed, it will be canceled by disable.
 472                  */
 473                 goto reschedule;
 474         }
 475
 476         if (time_is_after_jiffies(ts->last_valid_interrupt +
 477                                   msecs_to_jiffies(ts->esd_timeout)))
 478                 goto out;
 479
 480         /* We should be able to read register without disabling interrupts. */
 481         error = regmap_read(ts->regmap, TSC2005_REG_CFR0, &r);
 482         if (!error &&
 483             !((r ^ TSC2005_CFR0_INITVALUE) & TSC2005_CFR0_RW_MASK)) {
 484                 goto out;
 485         }
 486
 487         /*
 488          * If we could not read our known value from configuration register 0
 489          * then we should reset the controller as if from power-up and start
 490          * scanning again.
 491          */
 492         dev_info(&ts->spi->dev, "TSC2005 not responding - resetting\n");
 493
 494         disable_irq(ts->spi->irq);
 495         del_timer_sync(&ts->penup_timer);
 496
 497         tsc2005_update_pen_state(ts, 0, 0, 0);
 498
 499         tsc2005_set_reset(ts, false);
 500         usleep_range(100, 500); /* only 10us required */
 501         tsc2005_set_reset(ts, true);
 502
 503         enable_irq(ts->spi->irq);
 504         tsc2005_start_scan(ts);
 505
 506 out:
 507         mutex_unlock(&ts->mutex);
 508 reschedule:
 509         /* re-arm the watchdog */
 510         schedule_delayed_work(&ts->esd_work,
 511                               round_jiffies_relative(
 512                                         msecs_to_jiffies(ts->esd_timeout)));
 513 }
 514
 515 static int tsc2005_open(struct input_dev *input)
 516 {
 517         struct tsc2005 *ts = input_get_drvdata(input);
 518
 519         mutex_lock(&ts->mutex);
 520
 521         if (!ts->suspended)
 522                 __tsc2005_enable(ts);
 523
 524         ts->opened = true;
 525
 526         mutex_unlock(&ts->mutex);
 527
 528         return 0;
 529 }
 530
 531 static void tsc2005_close(struct input_dev *input)
 532 {
 533         struct tsc2005 *ts = input_get_drvdata(input);
 534
 535         mutex_lock(&ts->mutex);
 536
 537         if (!ts->suspended)
 538                 __tsc2005_disable(ts);
 539
 540         ts->opened = false;
 541
 542         mutex_unlock(&ts->mutex);
 543 }
 544
 545 static int tsc2005_probe(struct spi_device *spi)
 546 {
 547         const struct tsc2005_platform_data *pdata = dev_get_platdata(&spi->dev);
 548         struct device_node *np = spi->dev.of_node;
 549
 550         struct tsc2005 *ts;
 551         struct input_dev *input_dev;
 552         unsigned int max_x = MAX_12BIT;
 553         unsigned int max_y = MAX_12BIT;
 554         unsigned int max_p = MAX_12BIT;
 555         unsigned int fudge_x = TSC2005_DEF_X_FUZZ;
 556         unsigned int fudge_y = TSC2005_DEF_Y_FUZZ;
 557         unsigned int fudge_p = TSC2005_DEF_P_FUZZ;
 558         unsigned int x_plate_ohm = TSC2005_DEF_RESISTOR;
 559         unsigned int esd_timeout;
 560         int error;
 561
 562         if (!np && !pdata) {
 563                 dev_err(&spi->dev, "no platform data\n");
 564                 return -ENODEV;
 565         }
 566
 567         if (spi->irq <= 0) {
 568                 dev_err(&spi->dev, "no irq\n");
 569                 return -ENODEV;
 570         }
 571
 572         if (pdata) {
 573                 fudge_x = pdata->ts_x_fudge;
 574                 fudge_y = pdata->ts_y_fudge;
 575                 fudge_p = pdata->ts_pressure_fudge;
 576                 max_x   = pdata->ts_x_max;
 577                 max_y   = pdata->ts_y_max;
 578                 max_p   = pdata->ts_pressure_max;
 579                 x_plate_ohm = pdata->ts_x_plate_ohm;
 580                 esd_timeout = pdata->esd_timeout_ms;
 581         } else {
 582                 x_plate_ohm = TSC2005_DEF_RESISTOR;
 583                 of_property_read_u32(np, "ti,x-plate-ohms", &x_plate_ohm);
 584                 esd_timeout = 0;
 585                 of_property_read_u32(np, "ti,esd-recovery-timeout-ms",
 586                                                                 &esd_timeout);
 587         }
 588
 589         spi->mode = SPI_MODE_0;
 590         spi->bits_per_word = 8;
 591         if (!spi->max_speed_hz)
 592                 spi->max_speed_hz = TSC2005_SPI_MAX_SPEED_HZ;
 593
 594         error = spi_setup(spi);
 595         if (error)
 596                 return error;
 597
 598         ts = devm_kzalloc(&spi->dev, sizeof(*ts), GFP_KERNEL);
 599         if (!ts)
 600                 return -ENOMEM;
 601
 602         input_dev = devm_input_allocate_device(&spi->dev);
 603         if (!input_dev)
 604                 return -ENOMEM;
 605
 606         ts->spi = spi;
 607         ts->idev = input_dev;
 608
 609         ts->regmap = devm_regmap_init_spi(spi, &tsc2005_regmap_config);
 610         if (IS_ERR(ts->regmap))
 611                 return PTR_ERR(ts->regmap);
 612
 613         ts->x_plate_ohm = x_plate_ohm;
 614         ts->esd_timeout = esd_timeout;
 615
 616         if (np) {
 617                 ts->reset_gpio = of_get_named_gpio(np, "reset-gpios", 0);
 618                 if (ts->reset_gpio == -EPROBE_DEFER)
 619                         return ts->reset_gpio;
 620                 if (ts->reset_gpio < 0) {
 621                         dev_err(&spi->dev, "error acquiring reset gpio: %d\n",
 622                                 ts->reset_gpio);
 623                         return ts->reset_gpio;
 624                 }
 625
 626                 error = devm_gpio_request_one(&spi->dev, ts->reset_gpio, 0,
 627                                               "reset-gpios");
 628                 if (error) {
 629                         dev_err(&spi->dev, "error requesting reset gpio: %d\n",
 630                                 error);
 631                         return error;
 632                 }
 633
 634                 ts->vio = devm_regulator_get(&spi->dev, "vio");
 635                 if (IS_ERR(ts->vio)) {
 636                         error = PTR_ERR(ts->vio);
 637                         dev_err(&spi->dev, "vio regulator missing (%d)", error);
 638                         return error;
 639                 }
 640         } else {
 641                 ts->reset_gpio = -1;
 642                 ts->set_reset = pdata->set_reset;
 643         }
 644
 645         mutex_init(&ts->mutex);
 646
 647         spin_lock_init(&ts->lock);
 648         setup_timer(&ts->penup_timer, tsc2005_penup_timer, (unsigned long)ts);
 649
 650         INIT_DELAYED_WORK(&ts->esd_work, tsc2005_esd_work);
 651
 652         snprintf(ts->phys, sizeof(ts->phys),
 653                  "%s/input-ts", dev_name(&spi->dev));
 654
 655         input_dev->name = "TSC2005 touchscreen";
 656         input_dev->phys = ts->phys;
 657         input_dev->id.bustype = BUS_SPI;
 658         input_dev->dev.parent = &spi->dev;
 659         input_dev->evbit[0] = BIT(EV_ABS) | BIT(EV_KEY);
 660         input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
 661
 662         input_set_abs_params(input_dev, ABS_X, 0, max_x, fudge_x, 0);
 663         input_set_abs_params(input_dev, ABS_Y, 0, max_y, fudge_y, 0);
 664         input_set_abs_params(input_dev, ABS_PRESSURE, 0, max_p, fudge_p, 0);
 665
 666         if (np)
 667                 touchscreen_parse_properties(input_dev, false);
 668
 669         input_dev->open = tsc2005_open;
 670         input_dev->close = tsc2005_close;
 671
 672         input_set_drvdata(input_dev, ts);
 673
 674         /* Ensure the touchscreen is off */
 675         tsc2005_stop_scan(ts);
 676
 677         error = devm_request_threaded_irq(&spi->dev, spi->irq, NULL,
 678                                           tsc2005_irq_thread,
 679                                           IRQF_TRIGGER_RISING | IRQF_ONESHOT,
 680                                           "tsc2005", ts);
 681         if (error) {
 682                 dev_err(&spi->dev, "Failed to request irq, err: %d\n", error);
 683                 return error;
 684         }
 685
 686         /* enable regulator for DT */
 687         if (ts->vio) {
 688                 error = regulator_enable(ts->vio);
 689                 if (error)
 690                         return error;
 691         }
 692
 693         spi_set_drvdata(spi, ts);
 694         error = sysfs_create_group(&spi->dev.kobj, &tsc2005_attr_group);
 695         if (error) {
 696                 dev_err(&spi->dev,
 697                         "Failed to create sysfs attributes, err: %d\n", error);
 698                 goto disable_regulator;
 699         }
 700
 701         error = input_register_device(ts->idev);
 702         if (error) {
 703                 dev_err(&spi->dev,
 704                         "Failed to register input device, err: %d\n", error);
 705                 goto err_remove_sysfs;
 706         }
 707
 708         irq_set_irq_wake(spi->irq, 1);
 709         return 0;
 710
 711 err_remove_sysfs:
 712         sysfs_remove_group(&spi->dev.kobj, &tsc2005_attr_group);
 713 disable_regulator:
 714         if (ts->vio)
 715                 regulator_disable(ts->vio);
 716         return error;
 717 }
 718
 719 static int tsc2005_remove(struct spi_device *spi)
 720 {
 721         struct tsc2005 *ts = spi_get_drvdata(spi);
 722
 723         sysfs_remove_group(&spi->dev.kobj, &tsc2005_attr_group);
 724
 725         if (ts->vio)
 726                 regulator_disable(ts->vio);
 727
 728         return 0;
 729 }
 730
 731 static int __maybe_unused tsc2005_suspend(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
 738         if (!ts->suspended && ts->opened)
 739                 __tsc2005_disable(ts);
 740
 741         ts->suspended = true;
 742
 743         mutex_unlock(&ts->mutex);
 744
 745         return 0;
 746 }
 747
 748 static int __maybe_unused tsc2005_resume(struct device *dev)
 749 {
 750         struct spi_device *spi = to_spi_device(dev);
 751         struct tsc2005 *ts = spi_get_drvdata(spi);
 752
 753         mutex_lock(&ts->mutex);
 754
 755         if (ts->suspended && ts->opened)
 756                 __tsc2005_enable(ts);
 757
 758         ts->suspended = false;
 759
 760         mutex_unlock(&ts->mutex);
 761
 762         return 0;
 763 }
 764
 765 static SIMPLE_DEV_PM_OPS(tsc2005_pm_ops, tsc2005_suspend, tsc2005_resume);
 766
 767 static struct spi_driver tsc2005_driver = {
 768         .driver = {
 769                 .name   = "tsc2005",
 770                 .owner  = THIS_MODULE,
 771                 .pm     = &tsc2005_pm_ops,
 772         },
 773         .probe  = tsc2005_probe,
 774         .remove = tsc2005_remove,
 775 };
 776
 777 module_spi_driver(tsc2005_driver);
 778
 779 MODULE_AUTHOR("Lauri Leukkunen <lauri.leukkunen@nokia.com>");
 780 MODULE_DESCRIPTION("TSC2005 Touchscreen Driver");
 781 MODULE_LICENSE("GPL");
 782 MODULE_ALIAS("spi:tsc2005");