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