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