git.oblomov.eu Git - linux-2.6/blob - drivers/input/touchscreen/wm97xx-core.c

   1 /*
   2  * wm97xx-core.c  --  Touch screen driver core for Wolfson WM9705, WM9712
   3  *                    and WM9713 AC97 Codecs.
   4  *
   5  * Copyright 2003, 2004, 2005, 2006, 2007, 2008 Wolfson Microelectronics PLC.
   6  * Author: Liam Girdwood
   7  *         liam.girdwood@wolfsonmicro.com or linux@wolfsonmicro.com
   8  * Parts Copyright : Ian Molton <spyro@f2s.com>
   9  *                   Andrew Zabolotny <zap@homelink.ru>
  10  *                   Russell King <rmk@arm.linux.org.uk>
  11  *
  12  *  This program is free software; you can redistribute  it and/or modify it
  13  *  under  the terms of  the GNU General  Public License as published by the
  14  *  Free Software Foundation;  either version 2 of the  License, or (at your
  15  *  option) any later version.
  16  *
  17  * Notes:
  18  *
  19  *  Features:
  20  *       - supports WM9705, WM9712, WM9713
  21  *       - polling mode
  22  *       - continuous mode (arch-dependent)
  23  *       - adjustable rpu/dpp settings
  24  *       - adjustable pressure current
  25  *       - adjustable sample settle delay
  26  *       - 4 and 5 wire touchscreens (5 wire is WM9712 only)
  27  *       - pen down detection
  28  *       - battery monitor
  29  *       - sample AUX adcs
  30  *       - power management
  31  *       - codec GPIO
  32  *       - codec event notification
  33  * Todo
  34  *       - Support for async sampling control for noisy LCDs.
  35  *
  36  */
  37
  38 #include <linux/module.h>
  39 #include <linux/moduleparam.h>
  40 #include <linux/version.h>
  41 #include <linux/kernel.h>
  42 #include <linux/init.h>
  43 #include <linux/delay.h>
  44 #include <linux/string.h>
  45 #include <linux/proc_fs.h>
  46 #include <linux/pm.h>
  47 #include <linux/interrupt.h>
  48 #include <linux/bitops.h>
  49 #include <linux/workqueue.h>
  50 #include <linux/wm97xx.h>
  51 #include <linux/uaccess.h>
  52 #include <linux/io.h>
  53
  54 #define TS_NAME                 "wm97xx"
  55 #define WM_CORE_VERSION         "1.00"
  56 #define DEFAULT_PRESSURE        0xb0c0
  57
  58
  59 /*
  60  * Touchscreen absolute values
  61  *
  62  * These parameters are used to help the input layer discard out of
  63  * range readings and reduce jitter etc.
  64  *
  65  *   o min, max:- indicate the min and max values your touch screen returns
  66  *   o fuzz:- use a higher number to reduce jitter
  67  *
  68  * The default values correspond to Mainstone II in QVGA mode
  69  *
  70  * Please read
  71  * Documentation/input/input-programming.txt for more details.
  72  */
  73
  74 static int abs_x[3] = {350, 3900, 5};
  75 module_param_array(abs_x, int, NULL, 0);
  76 MODULE_PARM_DESC(abs_x, "Touchscreen absolute X min, max, fuzz");
  77
  78 static int abs_y[3] = {320, 3750, 40};
  79 module_param_array(abs_y, int, NULL, 0);
  80 MODULE_PARM_DESC(abs_y, "Touchscreen absolute Y min, max, fuzz");
  81
  82 static int abs_p[3] = {0, 150, 4};
  83 module_param_array(abs_p, int, NULL, 0);
  84 MODULE_PARM_DESC(abs_p, "Touchscreen absolute Pressure min, max, fuzz");
  85
  86 /*
  87  * wm97xx IO access, all IO locking done by AC97 layer
  88  */
  89 int wm97xx_reg_read(struct wm97xx *wm, u16 reg)
  90 {
  91         if (wm->ac97)
  92                 return wm->ac97->bus->ops->read(wm->ac97, reg);
  93         else
  94                 return -1;
  95 }
  96 EXPORT_SYMBOL_GPL(wm97xx_reg_read);
  97
  98 void wm97xx_reg_write(struct wm97xx *wm, u16 reg, u16 val)
  99 {
 100         /* cache digitiser registers */
 101         if (reg >= AC97_WM9713_DIG1 && reg <= AC97_WM9713_DIG3)
 102                 wm->dig[(reg - AC97_WM9713_DIG1) >> 1] = val;
 103
 104         /* cache gpio regs */
 105         if (reg >= AC97_GPIO_CFG && reg <= AC97_MISC_AFE)
 106                 wm->gpio[(reg - AC97_GPIO_CFG) >> 1] = val;
 107
 108         /* wm9713 irq reg */
 109         if (reg == 0x5a)
 110                 wm->misc = val;
 111
 112         if (wm->ac97)
 113                 wm->ac97->bus->ops->write(wm->ac97, reg, val);
 114 }
 115 EXPORT_SYMBOL_GPL(wm97xx_reg_write);
 116
 117 /**
 118  * wm97xx_read_aux_adc - Read the aux adc.
 119  * @wm: wm97xx device.
 120  * @adcsel: codec ADC to be read
 121  *
 122  * Reads the selected AUX ADC.
 123  */
 124
 125 int wm97xx_read_aux_adc(struct wm97xx *wm, u16 adcsel)
 126 {
 127         int power_adc = 0, auxval;
 128         u16 power = 0;
 129
 130         /* get codec */
 131         mutex_lock(&wm->codec_mutex);
 132
 133         /* When the touchscreen is not in use, we may have to power up
 134          * the AUX ADC before we can use sample the AUX inputs->
 135          */
 136         if (wm->id == WM9713_ID2 &&
 137             (power = wm97xx_reg_read(wm, AC97_EXTENDED_MID)) & 0x8000) {
 138                 power_adc = 1;
 139                 wm97xx_reg_write(wm, AC97_EXTENDED_MID, power & 0x7fff);
 140         }
 141
 142         /* Prepare the codec for AUX reading */
 143         wm->codec->aux_prepare(wm);
 144
 145         /* Turn polling mode on to read AUX ADC */
 146         wm->pen_probably_down = 1;
 147         wm->codec->poll_sample(wm, adcsel, &auxval);
 148
 149         if (power_adc)
 150                 wm97xx_reg_write(wm, AC97_EXTENDED_MID, power | 0x8000);
 151
 152         wm->codec->dig_restore(wm);
 153
 154         wm->pen_probably_down = 0;
 155
 156         mutex_unlock(&wm->codec_mutex);
 157         return auxval & 0xfff;
 158 }
 159 EXPORT_SYMBOL_GPL(wm97xx_read_aux_adc);
 160
 161 /**
 162  * wm97xx_get_gpio - Get the status of a codec GPIO.
 163  * @wm: wm97xx device.
 164  * @gpio: gpio
 165  *
 166  * Get the status of a codec GPIO pin
 167  */
 168
 169 enum wm97xx_gpio_status wm97xx_get_gpio(struct wm97xx *wm, u32 gpio)
 170 {
 171         u16 status;
 172         enum wm97xx_gpio_status ret;
 173
 174         mutex_lock(&wm->codec_mutex);
 175         status = wm97xx_reg_read(wm, AC97_GPIO_STATUS);
 176
 177         if (status & gpio)
 178                 ret = WM97XX_GPIO_HIGH;
 179         else
 180                 ret = WM97XX_GPIO_LOW;
 181
 182         mutex_unlock(&wm->codec_mutex);
 183         return ret;
 184 }
 185 EXPORT_SYMBOL_GPL(wm97xx_get_gpio);
 186
 187 /**
 188  * wm97xx_set_gpio - Set the status of a codec GPIO.
 189  * @wm: wm97xx device.
 190  * @gpio: gpio
 191  *
 192  *
 193  * Set the status of a codec GPIO pin
 194  */
 195
 196 void wm97xx_set_gpio(struct wm97xx *wm, u32 gpio,
 197                                 enum wm97xx_gpio_status status)
 198 {
 199         u16 reg;
 200
 201         mutex_lock(&wm->codec_mutex);
 202         reg = wm97xx_reg_read(wm, AC97_GPIO_STATUS);
 203
 204         if (status & WM97XX_GPIO_HIGH)
 205                 reg |= gpio;
 206         else
 207                 reg &= ~gpio;
 208
 209         if (wm->id == WM9712_ID2)
 210                 wm97xx_reg_write(wm, AC97_GPIO_STATUS, reg << 1);
 211         else
 212                 wm97xx_reg_write(wm, AC97_GPIO_STATUS, reg);
 213         mutex_unlock(&wm->codec_mutex);
 214 }
 215 EXPORT_SYMBOL_GPL(wm97xx_set_gpio);
 216
 217 /*
 218  * Codec GPIO pin configuration, this sets pin direction, polarity,
 219  * stickyness and wake up.
 220  */
 221 void wm97xx_config_gpio(struct wm97xx *wm, u32 gpio, enum wm97xx_gpio_dir dir,
 222                    enum wm97xx_gpio_pol pol, enum wm97xx_gpio_sticky sticky,
 223                    enum wm97xx_gpio_wake wake)
 224 {
 225         u16 reg;
 226
 227         mutex_lock(&wm->codec_mutex);
 228         reg = wm97xx_reg_read(wm, AC97_GPIO_POLARITY);
 229
 230         if (pol == WM97XX_GPIO_POL_HIGH)
 231                 reg |= gpio;
 232         else
 233                 reg &= ~gpio;
 234
 235         wm97xx_reg_write(wm, AC97_GPIO_POLARITY, reg);
 236         reg = wm97xx_reg_read(wm, AC97_GPIO_STICKY);
 237
 238         if (sticky == WM97XX_GPIO_STICKY)
 239                 reg |= gpio;
 240         else
 241                 reg &= ~gpio;
 242
 243         wm97xx_reg_write(wm, AC97_GPIO_STICKY, reg);
 244         reg = wm97xx_reg_read(wm, AC97_GPIO_WAKEUP);
 245
 246         if (wake == WM97XX_GPIO_WAKE)
 247                 reg |= gpio;
 248         else
 249                 reg &= ~gpio;
 250
 251         wm97xx_reg_write(wm, AC97_GPIO_WAKEUP, reg);
 252         reg = wm97xx_reg_read(wm, AC97_GPIO_CFG);
 253
 254         if (dir == WM97XX_GPIO_IN)
 255                 reg |= gpio;
 256         else
 257                 reg &= ~gpio;
 258
 259         wm97xx_reg_write(wm, AC97_GPIO_CFG, reg);
 260         mutex_unlock(&wm->codec_mutex);
 261 }
 262 EXPORT_SYMBOL_GPL(wm97xx_config_gpio);
 263
 264 /*
 265  * Configure the WM97XX_PRP value to use while system is suspended.
 266  * If a value other than 0 is set then WM97xx pen detection will be
 267  * left enabled in the configured mode while the system is in suspend,
 268  * the device has users and suspend has not been disabled via the
 269  * wakeup sysfs entries.
 270  *
 271  * @wm:   WM97xx device to configure
 272  * @mode: WM97XX_PRP value to configure while suspended
 273  */
 274 void wm97xx_set_suspend_mode(struct wm97xx *wm, u16 mode)
 275 {
 276         wm->suspend_mode = mode;
 277         device_init_wakeup(&wm->input_dev->dev, mode != 0);
 278 }
 279 EXPORT_SYMBOL_GPL(wm97xx_set_suspend_mode);
 280
 281 /*
 282  * Handle a pen down interrupt.
 283  */
 284 static void wm97xx_pen_irq_worker(struct work_struct *work)
 285 {
 286         struct wm97xx *wm = container_of(work, struct wm97xx, pen_event_work);
 287         int pen_was_down = wm->pen_is_down;
 288
 289         /* do we need to enable the touch panel reader */
 290         if (wm->id == WM9705_ID2) {
 291                 if (wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER_RD) &
 292                                         WM97XX_PEN_DOWN)
 293                         wm->pen_is_down = 1;
 294                 else
 295                         wm->pen_is_down = 0;
 296         } else {
 297                 u16 status, pol;
 298                 mutex_lock(&wm->codec_mutex);
 299                 status = wm97xx_reg_read(wm, AC97_GPIO_STATUS);
 300                 pol = wm97xx_reg_read(wm, AC97_GPIO_POLARITY);
 301
 302                 if (WM97XX_GPIO_13 & pol & status) {
 303                         wm->pen_is_down = 1;
 304                         wm97xx_reg_write(wm, AC97_GPIO_POLARITY, pol &
 305                                                 ~WM97XX_GPIO_13);
 306                 } else {
 307                         wm->pen_is_down = 0;
 308                         wm97xx_reg_write(wm, AC97_GPIO_POLARITY, pol |
 309                                          WM97XX_GPIO_13);
 310                 }
 311
 312                 if (wm->id == WM9712_ID2)
 313                         wm97xx_reg_write(wm, AC97_GPIO_STATUS, (status &
 314                                                 ~WM97XX_GPIO_13) << 1);
 315                 else
 316                         wm97xx_reg_write(wm, AC97_GPIO_STATUS, status &
 317                                                 ~WM97XX_GPIO_13);
 318                 mutex_unlock(&wm->codec_mutex);
 319         }
 320
 321         /* If the system is not using continuous mode or it provides a
 322          * pen down operation then we need to schedule polls while the
 323          * pen is down.  Otherwise the machine driver is responsible
 324          * for scheduling reads.
 325          */
 326         if (!wm->mach_ops->acc_enabled || wm->mach_ops->acc_pen_down) {
 327                 if (wm->pen_is_down && !pen_was_down) {
 328                         /* Data is not availiable immediately on pen down */
 329                         queue_delayed_work(wm->ts_workq, &wm->ts_reader, 1);
 330                 }
 331
 332                 /* Let ts_reader report the pen up for debounce. */
 333                 if (!wm->pen_is_down && pen_was_down)
 334                         wm->pen_is_down = 1;
 335         }
 336
 337         if (!wm->pen_is_down && wm->mach_ops->acc_enabled)
 338                 wm->mach_ops->acc_pen_up(wm);
 339
 340         wm->mach_ops->irq_enable(wm, 1);
 341 }
 342
 343 /*
 344  * Codec PENDOWN irq handler
 345  *
 346  * We have to disable the codec interrupt in the handler because it
 347  * can take upto 1ms to clear the interrupt source. We schedule a task
 348  * in a work queue to do the actual interaction with the chip.  The
 349  * interrupt is then enabled again in the slow handler when the source
 350  * has been cleared.
 351  */
 352 static irqreturn_t wm97xx_pen_interrupt(int irq, void *dev_id)
 353 {
 354         struct wm97xx *wm = dev_id;
 355
 356         if (!work_pending(&wm->pen_event_work)) {
 357                 wm->mach_ops->irq_enable(wm, 0);
 358                 queue_work(wm->ts_workq, &wm->pen_event_work);
 359         }
 360
 361         return IRQ_HANDLED;
 362 }
 363
 364 /*
 365  * initialise pen IRQ handler and workqueue
 366  */
 367 static int wm97xx_init_pen_irq(struct wm97xx *wm)
 368 {
 369         u16 reg;
 370
 371         /* If an interrupt is supplied an IRQ enable operation must also be
 372          * provided. */
 373         BUG_ON(!wm->mach_ops->irq_enable);
 374
 375         if (request_irq(wm->pen_irq, wm97xx_pen_interrupt,
 376                         IRQF_SHARED | IRQF_SAMPLE_RANDOM,
 377                         "wm97xx-pen", wm)) {
 378                 dev_err(wm->dev,
 379                         "Failed to register pen down interrupt, polling");
 380                 wm->pen_irq = 0;
 381                 return -EINVAL;
 382         }
 383
 384         /* Configure GPIO as interrupt source on WM971x */
 385         if (wm->id != WM9705_ID2) {
 386                 BUG_ON(!wm->mach_ops->irq_gpio);
 387                 reg = wm97xx_reg_read(wm, AC97_MISC_AFE);
 388                 wm97xx_reg_write(wm, AC97_MISC_AFE,
 389                                 reg & ~(wm->mach_ops->irq_gpio));
 390                 reg = wm97xx_reg_read(wm, 0x5a);
 391                 wm97xx_reg_write(wm, 0x5a, reg & ~0x0001);
 392         }
 393
 394         return 0;
 395 }
 396
 397 static int wm97xx_read_samples(struct wm97xx *wm)
 398 {
 399         struct wm97xx_data data;
 400         int rc;
 401
 402         mutex_lock(&wm->codec_mutex);
 403
 404         if (wm->mach_ops && wm->mach_ops->acc_enabled)
 405                 rc = wm->mach_ops->acc_pen_down(wm);
 406         else
 407                 rc = wm->codec->poll_touch(wm, &data);
 408
 409         if (rc & RC_PENUP) {
 410                 if (wm->pen_is_down) {
 411                         wm->pen_is_down = 0;
 412                         dev_dbg(wm->dev, "pen up\n");
 413                         input_report_abs(wm->input_dev, ABS_PRESSURE, 0);
 414                         input_sync(wm->input_dev);
 415                 } else if (!(rc & RC_AGAIN)) {
 416                         /* We need high frequency updates only while
 417                         * pen is down, the user never will be able to
 418                         * touch screen faster than a few times per
 419                         * second... On the other hand, when the user
 420                         * is actively working with the touchscreen we
 421                         * don't want to lose the quick response. So we
 422                         * will slowly increase sleep time after the
 423                         * pen is up and quicky restore it to ~one task
 424                         * switch when pen is down again.
 425                         */
 426                         if (wm->ts_reader_interval < HZ / 10)
 427                                 wm->ts_reader_interval++;
 428                 }
 429
 430         } else if (rc & RC_VALID) {
 431                 dev_dbg(wm->dev,
 432                         "pen down: x=%x:%d, y=%x:%d, pressure=%x:%d\n",
 433                         data.x >> 12, data.x & 0xfff, data.y >> 12,
 434                         data.y & 0xfff, data.p >> 12, data.p & 0xfff);
 435                 input_report_abs(wm->input_dev, ABS_X, data.x & 0xfff);
 436                 input_report_abs(wm->input_dev, ABS_Y, data.y & 0xfff);
 437                 input_report_abs(wm->input_dev, ABS_PRESSURE, data.p & 0xfff);
 438                 input_sync(wm->input_dev);
 439                 wm->pen_is_down = 1;
 440                 wm->ts_reader_interval = wm->ts_reader_min_interval;
 441         } else if (rc & RC_PENDOWN) {
 442                 dev_dbg(wm->dev, "pen down\n");
 443                 wm->pen_is_down = 1;
 444                 wm->ts_reader_interval = wm->ts_reader_min_interval;
 445         }
 446
 447         mutex_unlock(&wm->codec_mutex);
 448         return rc;
 449 }
 450
 451 /*
 452 * The touchscreen sample reader.
 453 */
 454 static void wm97xx_ts_reader(struct work_struct *work)
 455 {
 456         int rc;
 457         struct wm97xx *wm = container_of(work, struct wm97xx, ts_reader.work);
 458
 459         BUG_ON(!wm->codec);
 460
 461         do {
 462                 rc = wm97xx_read_samples(wm);
 463         } while (rc & RC_AGAIN);
 464
 465         if (wm->pen_is_down || !wm->pen_irq)
 466                 queue_delayed_work(wm->ts_workq, &wm->ts_reader,
 467                                    wm->ts_reader_interval);
 468 }
 469
 470 /**
 471  * wm97xx_ts_input_open - Open the touch screen input device.
 472  * @idev:       Input device to be opened.
 473  *
 474  * Called by the input sub system to open a wm97xx touchscreen device.
 475  * Starts the touchscreen thread and touch digitiser.
 476  */
 477 static int wm97xx_ts_input_open(struct input_dev *idev)
 478 {
 479         struct wm97xx *wm = input_get_drvdata(idev);
 480
 481         wm->ts_workq = create_singlethread_workqueue("kwm97xx");
 482         if (wm->ts_workq == NULL) {
 483                 dev_err(wm->dev,
 484                         "Failed to create workqueue\n");
 485                 return -EINVAL;
 486         }
 487
 488         /* start digitiser */
 489         if (wm->mach_ops && wm->mach_ops->acc_enabled)
 490                 wm->codec->acc_enable(wm, 1);
 491         wm->codec->dig_enable(wm, 1);
 492
 493         INIT_DELAYED_WORK(&wm->ts_reader, wm97xx_ts_reader);
 494         INIT_WORK(&wm->pen_event_work, wm97xx_pen_irq_worker);
 495
 496         wm->ts_reader_min_interval = HZ >= 100 ? HZ / 100 : 1;
 497         if (wm->ts_reader_min_interval < 1)
 498                 wm->ts_reader_min_interval = 1;
 499         wm->ts_reader_interval = wm->ts_reader_min_interval;
 500
 501         wm->pen_is_down = 0;
 502         if (wm->pen_irq)
 503                 wm97xx_init_pen_irq(wm);
 504         else
 505                 dev_err(wm->dev, "No IRQ specified\n");
 506
 507         /* If we either don't have an interrupt for pen down events or
 508          * failed to acquire it then we need to poll.
 509          */
 510         if (wm->pen_irq == 0)
 511                 queue_delayed_work(wm->ts_workq, &wm->ts_reader,
 512                                    wm->ts_reader_interval);
 513
 514         return 0;
 515 }
 516
 517 /**
 518  * wm97xx_ts_input_close - Close the touch screen input device.
 519  * @idev:       Input device to be closed.
 520  *
 521  * Called by the input sub system to close a wm97xx touchscreen
 522  * device.  Kills the touchscreen thread and stops the touch
 523  * digitiser.
 524  */
 525
 526 static void wm97xx_ts_input_close(struct input_dev *idev)
 527 {
 528         struct wm97xx *wm = input_get_drvdata(idev);
 529         u16 reg;
 530
 531         if (wm->pen_irq) {
 532                 /* Return the interrupt to GPIO usage (disabling it) */
 533                 if (wm->id != WM9705_ID2) {
 534                         BUG_ON(!wm->mach_ops->irq_gpio);
 535                         reg = wm97xx_reg_read(wm, AC97_MISC_AFE);
 536                         wm97xx_reg_write(wm, AC97_MISC_AFE,
 537                                          reg | wm->mach_ops->irq_gpio);
 538                 }
 539
 540                 free_irq(wm->pen_irq, wm);
 541         }
 542
 543         wm->pen_is_down = 0;
 544
 545         /* Balance out interrupt disables/enables */
 546         if (cancel_work_sync(&wm->pen_event_work))
 547                 wm->mach_ops->irq_enable(wm, 1);
 548
 549         /* ts_reader rearms itself so we need to explicitly stop it
 550          * before we destroy the workqueue.
 551          */
 552         cancel_delayed_work_sync(&wm->ts_reader);
 553
 554         destroy_workqueue(wm->ts_workq);
 555
 556         /* stop digitiser */
 557         wm->codec->dig_enable(wm, 0);
 558         if (wm->mach_ops && wm->mach_ops->acc_enabled)
 559                 wm->codec->acc_enable(wm, 0);
 560 }
 561
 562 static int wm97xx_probe(struct device *dev)
 563 {
 564         struct wm97xx *wm;
 565         int ret = 0, id = 0;
 566
 567         wm = kzalloc(sizeof(struct wm97xx), GFP_KERNEL);
 568         if (!wm)
 569                 return -ENOMEM;
 570         mutex_init(&wm->codec_mutex);
 571
 572         wm->dev = dev;
 573         dev->driver_data = wm;
 574         wm->ac97 = to_ac97_t(dev);
 575
 576         /* check that we have a supported codec */
 577         id = wm97xx_reg_read(wm, AC97_VENDOR_ID1);
 578         if (id != WM97XX_ID1) {
 579                 dev_err(dev, "Device with vendor %04x is not a wm97xx\n", id);
 580                 ret = -ENODEV;
 581                 goto alloc_err;
 582         }
 583
 584         wm->id = wm97xx_reg_read(wm, AC97_VENDOR_ID2);
 585
 586         dev_info(wm->dev, "detected a wm97%02x codec\n", wm->id & 0xff);
 587
 588         switch (wm->id & 0xff) {
 589 #ifdef CONFIG_TOUCHSCREEN_WM9705
 590         case 0x05:
 591                 wm->codec = &wm9705_codec;
 592                 break;
 593 #endif
 594 #ifdef CONFIG_TOUCHSCREEN_WM9712
 595         case 0x12:
 596                 wm->codec = &wm9712_codec;
 597                 break;
 598 #endif
 599 #ifdef CONFIG_TOUCHSCREEN_WM9713
 600         case 0x13:
 601                 wm->codec = &wm9713_codec;
 602                 break;
 603 #endif
 604         default:
 605                 dev_err(wm->dev, "Support for wm97%02x not compiled in.\n",
 606                         wm->id & 0xff);
 607                 ret = -ENODEV;
 608                 goto alloc_err;
 609         }
 610
 611         /* set up physical characteristics */
 612         wm->codec->phy_init(wm);
 613
 614         /* load gpio cache */
 615         wm->gpio[0] = wm97xx_reg_read(wm, AC97_GPIO_CFG);
 616         wm->gpio[1] = wm97xx_reg_read(wm, AC97_GPIO_POLARITY);
 617         wm->gpio[2] = wm97xx_reg_read(wm, AC97_GPIO_STICKY);
 618         wm->gpio[3] = wm97xx_reg_read(wm, AC97_GPIO_WAKEUP);
 619         wm->gpio[4] = wm97xx_reg_read(wm, AC97_GPIO_STATUS);
 620         wm->gpio[5] = wm97xx_reg_read(wm, AC97_MISC_AFE);
 621
 622         wm->input_dev = input_allocate_device();
 623         if (wm->input_dev == NULL) {
 624                 ret = -ENOMEM;
 625                 goto alloc_err;
 626         }
 627
 628         /* set up touch configuration */
 629         wm->input_dev->name = "wm97xx touchscreen";
 630         wm->input_dev->phys = "wm97xx";
 631         wm->input_dev->open = wm97xx_ts_input_open;
 632         wm->input_dev->close = wm97xx_ts_input_close;
 633         set_bit(EV_ABS, wm->input_dev->evbit);
 634         set_bit(ABS_X, wm->input_dev->absbit);
 635         set_bit(ABS_Y, wm->input_dev->absbit);
 636         set_bit(ABS_PRESSURE, wm->input_dev->absbit);
 637         input_set_abs_params(wm->input_dev, ABS_X, abs_x[0], abs_x[1],
 638                              abs_x[2], 0);
 639         input_set_abs_params(wm->input_dev, ABS_Y, abs_y[0], abs_y[1],
 640                              abs_y[2], 0);
 641         input_set_abs_params(wm->input_dev, ABS_PRESSURE, abs_p[0], abs_p[1],
 642                              abs_p[2], 0);
 643         input_set_drvdata(wm->input_dev, wm);
 644         wm->input_dev->dev.parent = dev;
 645         ret = input_register_device(wm->input_dev);
 646         if (ret < 0)
 647                 goto dev_alloc_err;
 648
 649         /* register our battery device */
 650         wm->battery_dev = platform_device_alloc("wm97xx-battery", -1);
 651         if (!wm->battery_dev) {
 652                 ret = -ENOMEM;
 653                 goto batt_err;
 654         }
 655         platform_set_drvdata(wm->battery_dev, wm);
 656         wm->battery_dev->dev.parent = dev;
 657         ret = platform_device_add(wm->battery_dev);
 658         if (ret < 0)
 659                 goto batt_reg_err;
 660
 661         /* register our extended touch device (for machine specific
 662          * extensions) */
 663         wm->touch_dev = platform_device_alloc("wm97xx-touch", -1);
 664         if (!wm->touch_dev) {
 665                 ret = -ENOMEM;
 666                 goto touch_err;
 667         }
 668         platform_set_drvdata(wm->touch_dev, wm);
 669         wm->touch_dev->dev.parent = dev;
 670         ret = platform_device_add(wm->touch_dev);
 671         if (ret < 0)
 672                 goto touch_reg_err;
 673
 674         return ret;
 675
 676  touch_reg_err:
 677         platform_device_put(wm->touch_dev);
 678  touch_err:
 679         platform_device_unregister(wm->battery_dev);
 680         wm->battery_dev = NULL;
 681  batt_reg_err:
 682         platform_device_put(wm->battery_dev);
 683  batt_err:
 684         input_unregister_device(wm->input_dev);
 685         wm->input_dev = NULL;
 686  dev_alloc_err:
 687         input_free_device(wm->input_dev);
 688  alloc_err:
 689         kfree(wm);
 690
 691         return ret;
 692 }
 693
 694 static int wm97xx_remove(struct device *dev)
 695 {
 696         struct wm97xx *wm = dev_get_drvdata(dev);
 697
 698         platform_device_unregister(wm->battery_dev);
 699         platform_device_unregister(wm->touch_dev);
 700         input_unregister_device(wm->input_dev);
 701         kfree(wm);
 702
 703         return 0;
 704 }
 705
 706 #ifdef CONFIG_PM
 707 static int wm97xx_suspend(struct device *dev, pm_message_t state)
 708 {
 709         struct wm97xx *wm = dev_get_drvdata(dev);
 710         u16 reg;
 711         int suspend_mode;
 712
 713         if (device_may_wakeup(&wm->input_dev->dev))
 714                 suspend_mode = wm->suspend_mode;
 715         else
 716                 suspend_mode = 0;
 717
 718         if (wm->input_dev->users)
 719                 cancel_delayed_work_sync(&wm->ts_reader);
 720
 721         /* Power down the digitiser (bypassing the cache for resume) */
 722         reg = wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER2);
 723         reg &= ~WM97XX_PRP_DET_DIG;
 724         if (wm->input_dev->users)
 725                 reg |= suspend_mode;
 726         wm->ac97->bus->ops->write(wm->ac97, AC97_WM97XX_DIGITISER2, reg);
 727
 728         /* WM9713 has an additional power bit - turn it off if there
 729          * are no users or if suspend mode is zero. */
 730         if (wm->id == WM9713_ID2 &&
 731             (!wm->input_dev->users || !suspend_mode)) {
 732                 reg = wm97xx_reg_read(wm, AC97_EXTENDED_MID) | 0x8000;
 733                 wm97xx_reg_write(wm, AC97_EXTENDED_MID, reg);
 734         }
 735
 736         return 0;
 737 }
 738
 739 static int wm97xx_resume(struct device *dev)
 740 {
 741         struct wm97xx *wm = dev_get_drvdata(dev);
 742
 743         /* restore digitiser and gpios */
 744         if (wm->id == WM9713_ID2) {
 745                 wm97xx_reg_write(wm, AC97_WM9713_DIG1, wm->dig[0]);
 746                 wm97xx_reg_write(wm, 0x5a, wm->misc);
 747                 if (wm->input_dev->users) {
 748                         u16 reg;
 749                         reg = wm97xx_reg_read(wm, AC97_EXTENDED_MID) & 0x7fff;
 750                         wm97xx_reg_write(wm, AC97_EXTENDED_MID, reg);
 751                 }
 752         }
 753
 754         wm97xx_reg_write(wm, AC97_WM9713_DIG2, wm->dig[1]);
 755         wm97xx_reg_write(wm, AC97_WM9713_DIG3, wm->dig[2]);
 756
 757         wm97xx_reg_write(wm, AC97_GPIO_CFG, wm->gpio[0]);
 758         wm97xx_reg_write(wm, AC97_GPIO_POLARITY, wm->gpio[1]);
 759         wm97xx_reg_write(wm, AC97_GPIO_STICKY, wm->gpio[2]);
 760         wm97xx_reg_write(wm, AC97_GPIO_WAKEUP, wm->gpio[3]);
 761         wm97xx_reg_write(wm, AC97_GPIO_STATUS, wm->gpio[4]);
 762         wm97xx_reg_write(wm, AC97_MISC_AFE, wm->gpio[5]);
 763
 764         if (wm->input_dev->users && !wm->pen_irq) {
 765                 wm->ts_reader_interval = wm->ts_reader_min_interval;
 766                 queue_delayed_work(wm->ts_workq, &wm->ts_reader,
 767                                    wm->ts_reader_interval);
 768         }
 769
 770         return 0;
 771 }
 772
 773 #else
 774 #define wm97xx_suspend          NULL
 775 #define wm97xx_resume           NULL
 776 #endif
 777
 778 /*
 779  * Machine specific operations
 780  */
 781 int wm97xx_register_mach_ops(struct wm97xx *wm,
 782                              struct wm97xx_mach_ops *mach_ops)
 783 {
 784         mutex_lock(&wm->codec_mutex);
 785         if (wm->mach_ops) {
 786                 mutex_unlock(&wm->codec_mutex);
 787                 return -EINVAL;
 788         }
 789         wm->mach_ops = mach_ops;
 790         mutex_unlock(&wm->codec_mutex);
 791
 792         return 0;
 793 }
 794 EXPORT_SYMBOL_GPL(wm97xx_register_mach_ops);
 795
 796 void wm97xx_unregister_mach_ops(struct wm97xx *wm)
 797 {
 798         mutex_lock(&wm->codec_mutex);
 799         wm->mach_ops = NULL;
 800         mutex_unlock(&wm->codec_mutex);
 801 }
 802 EXPORT_SYMBOL_GPL(wm97xx_unregister_mach_ops);
 803
 804 static struct device_driver wm97xx_driver = {
 805         .name =         "wm97xx-ts",
 806         .bus =          &ac97_bus_type,
 807         .owner =        THIS_MODULE,
 808         .probe =        wm97xx_probe,
 809         .remove =       wm97xx_remove,
 810         .suspend =      wm97xx_suspend,
 811         .resume =       wm97xx_resume,
 812 };
 813
 814 static int __init wm97xx_init(void)
 815 {
 816         return driver_register(&wm97xx_driver);
 817 }
 818
 819 static void __exit wm97xx_exit(void)
 820 {
 821         driver_unregister(&wm97xx_driver);
 822 }
 823
 824 module_init(wm97xx_init);
 825 module_exit(wm97xx_exit);
 826
 827 /* Module information */
 828 MODULE_AUTHOR("Liam Girdwood <liam.girdwood@wolfsonmicro.com>");
 829 MODULE_DESCRIPTION("WM97xx Core - Touch Screen / AUX ADC / GPIO Driver");
 830 MODULE_LICENSE("GPL");