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/mfd/wm97xx.h>
  48 #include <linux/workqueue.h>
  49 #include <linux/wm97xx.h>
  50 #include <linux/uaccess.h>
  51 #include <linux/io.h>
  52 #include <linux/slab.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.rst for more details.
  72  */
  73
  74 static int abs_x[3] = {150, 4000, 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] = {200, 4000, 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         int rc = 0;
 130         int timeout = 0;
 131
 132         /* get codec */
 133         mutex_lock(&wm->codec_mutex);
 134
 135         /* When the touchscreen is not in use, we may have to power up
 136          * the AUX ADC before we can use sample the AUX inputs->
 137          */
 138         if (wm->id == WM9713_ID2 &&
 139             (power = wm97xx_reg_read(wm, AC97_EXTENDED_MID)) & 0x8000) {
 140                 power_adc = 1;
 141                 wm97xx_reg_write(wm, AC97_EXTENDED_MID, power & 0x7fff);
 142         }
 143
 144         /* Prepare the codec for AUX reading */
 145         wm->codec->aux_prepare(wm);
 146
 147         /* Turn polling mode on to read AUX ADC */
 148         wm->pen_probably_down = 1;
 149
 150         while (rc != RC_VALID && timeout++ < 5)
 151                 rc = wm->codec->poll_sample(wm, adcsel, &auxval);
 152
 153         if (power_adc)
 154                 wm97xx_reg_write(wm, AC97_EXTENDED_MID, power | 0x8000);
 155
 156         wm->codec->dig_restore(wm);
 157
 158         wm->pen_probably_down = 0;
 159
 160         if (timeout >= 5) {
 161                 dev_err(wm->dev,
 162                         "timeout reading auxadc %d, disabling digitiser\n",
 163                         adcsel);
 164                 wm->codec->dig_enable(wm, false);
 165         }
 166
 167         mutex_unlock(&wm->codec_mutex);
 168         return (rc == RC_VALID ? auxval & 0xfff : -EBUSY);
 169 }
 170 EXPORT_SYMBOL_GPL(wm97xx_read_aux_adc);
 171
 172 /**
 173  * wm97xx_get_gpio - Get the status of a codec GPIO.
 174  * @wm: wm97xx device.
 175  * @gpio: gpio
 176  *
 177  * Get the status of a codec GPIO pin
 178  */
 179
 180 enum wm97xx_gpio_status wm97xx_get_gpio(struct wm97xx *wm, u32 gpio)
 181 {
 182         u16 status;
 183         enum wm97xx_gpio_status ret;
 184
 185         mutex_lock(&wm->codec_mutex);
 186         status = wm97xx_reg_read(wm, AC97_GPIO_STATUS);
 187
 188         if (status & gpio)
 189                 ret = WM97XX_GPIO_HIGH;
 190         else
 191                 ret = WM97XX_GPIO_LOW;
 192
 193         mutex_unlock(&wm->codec_mutex);
 194         return ret;
 195 }
 196 EXPORT_SYMBOL_GPL(wm97xx_get_gpio);
 197
 198 /**
 199  * wm97xx_set_gpio - Set the status of a codec GPIO.
 200  * @wm: wm97xx device.
 201  * @gpio: gpio
 202  *
 203  *
 204  * Set the status of a codec GPIO pin
 205  */
 206
 207 void wm97xx_set_gpio(struct wm97xx *wm, u32 gpio,
 208                                 enum wm97xx_gpio_status status)
 209 {
 210         u16 reg;
 211
 212         mutex_lock(&wm->codec_mutex);
 213         reg = wm97xx_reg_read(wm, AC97_GPIO_STATUS);
 214
 215         if (status == WM97XX_GPIO_HIGH)
 216                 reg |= gpio;
 217         else
 218                 reg &= ~gpio;
 219
 220         if (wm->id == WM9712_ID2 && wm->variant != WM97xx_WM1613)
 221                 wm97xx_reg_write(wm, AC97_GPIO_STATUS, reg << 1);
 222         else
 223                 wm97xx_reg_write(wm, AC97_GPIO_STATUS, reg);
 224         mutex_unlock(&wm->codec_mutex);
 225 }
 226 EXPORT_SYMBOL_GPL(wm97xx_set_gpio);
 227
 228 /*
 229  * Codec GPIO pin configuration, this sets pin direction, polarity,
 230  * stickyness and wake up.
 231  */
 232 void wm97xx_config_gpio(struct wm97xx *wm, u32 gpio, enum wm97xx_gpio_dir dir,
 233                    enum wm97xx_gpio_pol pol, enum wm97xx_gpio_sticky sticky,
 234                    enum wm97xx_gpio_wake wake)
 235 {
 236         u16 reg;
 237
 238         mutex_lock(&wm->codec_mutex);
 239         reg = wm97xx_reg_read(wm, AC97_GPIO_POLARITY);
 240
 241         if (pol == WM97XX_GPIO_POL_HIGH)
 242                 reg |= gpio;
 243         else
 244                 reg &= ~gpio;
 245
 246         wm97xx_reg_write(wm, AC97_GPIO_POLARITY, reg);
 247         reg = wm97xx_reg_read(wm, AC97_GPIO_STICKY);
 248
 249         if (sticky == WM97XX_GPIO_STICKY)
 250                 reg |= gpio;
 251         else
 252                 reg &= ~gpio;
 253
 254         wm97xx_reg_write(wm, AC97_GPIO_STICKY, reg);
 255         reg = wm97xx_reg_read(wm, AC97_GPIO_WAKEUP);
 256
 257         if (wake == WM97XX_GPIO_WAKE)
 258                 reg |= gpio;
 259         else
 260                 reg &= ~gpio;
 261
 262         wm97xx_reg_write(wm, AC97_GPIO_WAKEUP, reg);
 263         reg = wm97xx_reg_read(wm, AC97_GPIO_CFG);
 264
 265         if (dir == WM97XX_GPIO_IN)
 266                 reg |= gpio;
 267         else
 268                 reg &= ~gpio;
 269
 270         wm97xx_reg_write(wm, AC97_GPIO_CFG, reg);
 271         mutex_unlock(&wm->codec_mutex);
 272 }
 273 EXPORT_SYMBOL_GPL(wm97xx_config_gpio);
 274
 275 /*
 276  * Configure the WM97XX_PRP value to use while system is suspended.
 277  * If a value other than 0 is set then WM97xx pen detection will be
 278  * left enabled in the configured mode while the system is in suspend,
 279  * the device has users and suspend has not been disabled via the
 280  * wakeup sysfs entries.
 281  *
 282  * @wm:   WM97xx device to configure
 283  * @mode: WM97XX_PRP value to configure while suspended
 284  */
 285 void wm97xx_set_suspend_mode(struct wm97xx *wm, u16 mode)
 286 {
 287         wm->suspend_mode = mode;
 288         device_init_wakeup(&wm->input_dev->dev, mode != 0);
 289 }
 290 EXPORT_SYMBOL_GPL(wm97xx_set_suspend_mode);
 291
 292 /*
 293  * Handle a pen down interrupt.
 294  */
 295 static void wm97xx_pen_irq_worker(struct work_struct *work)
 296 {
 297         struct wm97xx *wm = container_of(work, struct wm97xx, pen_event_work);
 298         int pen_was_down = wm->pen_is_down;
 299
 300         /* do we need to enable the touch panel reader */
 301         if (wm->id == WM9705_ID2) {
 302                 if (wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER_RD) &
 303                                         WM97XX_PEN_DOWN)
 304                         wm->pen_is_down = 1;
 305                 else
 306                         wm->pen_is_down = 0;
 307         } else {
 308                 u16 status, pol;
 309                 mutex_lock(&wm->codec_mutex);
 310                 status = wm97xx_reg_read(wm, AC97_GPIO_STATUS);
 311                 pol = wm97xx_reg_read(wm, AC97_GPIO_POLARITY);
 312
 313                 if (WM97XX_GPIO_13 & pol & status) {
 314                         wm->pen_is_down = 1;
 315                         wm97xx_reg_write(wm, AC97_GPIO_POLARITY, pol &
 316                                                 ~WM97XX_GPIO_13);
 317                 } else {
 318                         wm->pen_is_down = 0;
 319                         wm97xx_reg_write(wm, AC97_GPIO_POLARITY, pol |
 320                                          WM97XX_GPIO_13);
 321                 }
 322
 323                 if (wm->id == WM9712_ID2 && wm->variant != WM97xx_WM1613)
 324                         wm97xx_reg_write(wm, AC97_GPIO_STATUS, (status &
 325                                                 ~WM97XX_GPIO_13) << 1);
 326                 else
 327                         wm97xx_reg_write(wm, AC97_GPIO_STATUS, status &
 328                                                 ~WM97XX_GPIO_13);
 329                 mutex_unlock(&wm->codec_mutex);
 330         }
 331
 332         /* If the system is not using continuous mode or it provides a
 333          * pen down operation then we need to schedule polls while the
 334          * pen is down.  Otherwise the machine driver is responsible
 335          * for scheduling reads.
 336          */
 337         if (!wm->mach_ops->acc_enabled || wm->mach_ops->acc_pen_down) {
 338                 if (wm->pen_is_down && !pen_was_down) {
 339                         /* Data is not available immediately on pen down */
 340                         queue_delayed_work(wm->ts_workq, &wm->ts_reader, 1);
 341                 }
 342
 343                 /* Let ts_reader report the pen up for debounce. */
 344                 if (!wm->pen_is_down && pen_was_down)
 345                         wm->pen_is_down = 1;
 346         }
 347
 348         if (!wm->pen_is_down && wm->mach_ops->acc_enabled)
 349                 wm->mach_ops->acc_pen_up(wm);
 350
 351         wm->mach_ops->irq_enable(wm, 1);
 352 }
 353
 354 /*
 355  * Codec PENDOWN irq handler
 356  *
 357  * We have to disable the codec interrupt in the handler because it
 358  * can take up to 1ms to clear the interrupt source. We schedule a task
 359  * in a work queue to do the actual interaction with the chip.  The
 360  * interrupt is then enabled again in the slow handler when the source
 361  * has been cleared.
 362  */
 363 static irqreturn_t wm97xx_pen_interrupt(int irq, void *dev_id)
 364 {
 365         struct wm97xx *wm = dev_id;
 366
 367         if (!work_pending(&wm->pen_event_work)) {
 368                 wm->mach_ops->irq_enable(wm, 0);
 369                 queue_work(wm->ts_workq, &wm->pen_event_work);
 370         }
 371
 372         return IRQ_HANDLED;
 373 }
 374
 375 /*
 376  * initialise pen IRQ handler and workqueue
 377  */
 378 static int wm97xx_init_pen_irq(struct wm97xx *wm)
 379 {
 380         u16 reg;
 381
 382         /* If an interrupt is supplied an IRQ enable operation must also be
 383          * provided. */
 384         BUG_ON(!wm->mach_ops->irq_enable);
 385
 386         if (request_irq(wm->pen_irq, wm97xx_pen_interrupt, IRQF_SHARED,
 387                         "wm97xx-pen", wm)) {
 388                 dev_err(wm->dev,
 389                         "Failed to register pen down interrupt, polling");
 390                 wm->pen_irq = 0;
 391                 return -EINVAL;
 392         }
 393
 394         /* Configure GPIO as interrupt source on WM971x */
 395         if (wm->id != WM9705_ID2) {
 396                 BUG_ON(!wm->mach_ops->irq_gpio);
 397                 reg = wm97xx_reg_read(wm, AC97_MISC_AFE);
 398                 wm97xx_reg_write(wm, AC97_MISC_AFE,
 399                                 reg & ~(wm->mach_ops->irq_gpio));
 400                 reg = wm97xx_reg_read(wm, 0x5a);
 401                 wm97xx_reg_write(wm, 0x5a, reg & ~0x0001);
 402         }
 403
 404         return 0;
 405 }
 406
 407 static int wm97xx_read_samples(struct wm97xx *wm)
 408 {
 409         struct wm97xx_data data;
 410         int rc;
 411
 412         mutex_lock(&wm->codec_mutex);
 413
 414         if (wm->mach_ops && wm->mach_ops->acc_enabled)
 415                 rc = wm->mach_ops->acc_pen_down(wm);
 416         else
 417                 rc = wm->codec->poll_touch(wm, &data);
 418
 419         if (rc & RC_PENUP) {
 420                 if (wm->pen_is_down) {
 421                         wm->pen_is_down = 0;
 422                         dev_dbg(wm->dev, "pen up\n");
 423                         input_report_abs(wm->input_dev, ABS_PRESSURE, 0);
 424                         input_report_key(wm->input_dev, BTN_TOUCH, 0);
 425                         input_sync(wm->input_dev);
 426                 } else if (!(rc & RC_AGAIN)) {
 427                         /* We need high frequency updates only while
 428                         * pen is down, the user never will be able to
 429                         * touch screen faster than a few times per
 430                         * second... On the other hand, when the user
 431                         * is actively working with the touchscreen we
 432                         * don't want to lose the quick response. So we
 433                         * will slowly increase sleep time after the
 434                         * pen is up and quicky restore it to ~one task
 435                         * switch when pen is down again.
 436                         */
 437                         if (wm->ts_reader_interval < HZ / 10)
 438                                 wm->ts_reader_interval++;
 439                 }
 440
 441         } else if (rc & RC_VALID) {
 442                 dev_dbg(wm->dev,
 443                         "pen down: x=%x:%d, y=%x:%d, pressure=%x:%d\n",
 444                         data.x >> 12, data.x & 0xfff, data.y >> 12,
 445                         data.y & 0xfff, data.p >> 12, data.p & 0xfff);
 446
 447                 if (abs_x[0] > (data.x & 0xfff) ||
 448                     abs_x[1] < (data.x & 0xfff) ||
 449                     abs_y[0] > (data.y & 0xfff) ||
 450                     abs_y[1] < (data.y & 0xfff)) {
 451                         dev_dbg(wm->dev, "Measurement out of range, dropping it\n");
 452                         rc = RC_AGAIN;
 453                         goto out;
 454                 }
 455
 456                 input_report_abs(wm->input_dev, ABS_X, data.x & 0xfff);
 457                 input_report_abs(wm->input_dev, ABS_Y, data.y & 0xfff);
 458                 input_report_abs(wm->input_dev, ABS_PRESSURE, data.p & 0xfff);
 459                 input_report_key(wm->input_dev, BTN_TOUCH, 1);
 460                 input_sync(wm->input_dev);
 461                 wm->pen_is_down = 1;
 462                 wm->ts_reader_interval = wm->ts_reader_min_interval;
 463         } else if (rc & RC_PENDOWN) {
 464                 dev_dbg(wm->dev, "pen down\n");
 465                 wm->pen_is_down = 1;
 466                 wm->ts_reader_interval = wm->ts_reader_min_interval;
 467         }
 468
 469 out:
 470         mutex_unlock(&wm->codec_mutex);
 471         return rc;
 472 }
 473
 474 /*
 475 * The touchscreen sample reader.
 476 */
 477 static void wm97xx_ts_reader(struct work_struct *work)
 478 {
 479         int rc;
 480         struct wm97xx *wm = container_of(work, struct wm97xx, ts_reader.work);
 481
 482         BUG_ON(!wm->codec);
 483
 484         do {
 485                 rc = wm97xx_read_samples(wm);
 486         } while (rc & RC_AGAIN);
 487
 488         if (wm->pen_is_down || !wm->pen_irq)
 489                 queue_delayed_work(wm->ts_workq, &wm->ts_reader,
 490                                    wm->ts_reader_interval);
 491 }
 492
 493 /**
 494  * wm97xx_ts_input_open - Open the touch screen input device.
 495  * @idev:       Input device to be opened.
 496  *
 497  * Called by the input sub system to open a wm97xx touchscreen device.
 498  * Starts the touchscreen thread and touch digitiser.
 499  */
 500 static int wm97xx_ts_input_open(struct input_dev *idev)
 501 {
 502         struct wm97xx *wm = input_get_drvdata(idev);
 503
 504         wm->ts_workq = alloc_ordered_workqueue("kwm97xx", 0);
 505         if (wm->ts_workq == NULL) {
 506                 dev_err(wm->dev,
 507                         "Failed to create workqueue\n");
 508                 return -EINVAL;
 509         }
 510
 511         /* start digitiser */
 512         if (wm->mach_ops && wm->mach_ops->acc_enabled)
 513                 wm->codec->acc_enable(wm, 1);
 514         wm->codec->dig_enable(wm, 1);
 515
 516         INIT_DELAYED_WORK(&wm->ts_reader, wm97xx_ts_reader);
 517         INIT_WORK(&wm->pen_event_work, wm97xx_pen_irq_worker);
 518
 519         wm->ts_reader_min_interval = HZ >= 100 ? HZ / 100 : 1;
 520         if (wm->ts_reader_min_interval < 1)
 521                 wm->ts_reader_min_interval = 1;
 522         wm->ts_reader_interval = wm->ts_reader_min_interval;
 523
 524         wm->pen_is_down = 0;
 525         if (wm->pen_irq)
 526                 wm97xx_init_pen_irq(wm);
 527         else
 528                 dev_err(wm->dev, "No IRQ specified\n");
 529
 530         /* If we either don't have an interrupt for pen down events or
 531          * failed to acquire it then we need to poll.
 532          */
 533         if (wm->pen_irq == 0)
 534                 queue_delayed_work(wm->ts_workq, &wm->ts_reader,
 535                                    wm->ts_reader_interval);
 536
 537         return 0;
 538 }
 539
 540 /**
 541  * wm97xx_ts_input_close - Close the touch screen input device.
 542  * @idev:       Input device to be closed.
 543  *
 544  * Called by the input sub system to close a wm97xx touchscreen
 545  * device.  Kills the touchscreen thread and stops the touch
 546  * digitiser.
 547  */
 548
 549 static void wm97xx_ts_input_close(struct input_dev *idev)
 550 {
 551         struct wm97xx *wm = input_get_drvdata(idev);
 552         u16 reg;
 553
 554         if (wm->pen_irq) {
 555                 /* Return the interrupt to GPIO usage (disabling it) */
 556                 if (wm->id != WM9705_ID2) {
 557                         BUG_ON(!wm->mach_ops->irq_gpio);
 558                         reg = wm97xx_reg_read(wm, AC97_MISC_AFE);
 559                         wm97xx_reg_write(wm, AC97_MISC_AFE,
 560                                          reg | wm->mach_ops->irq_gpio);
 561                 }
 562
 563                 free_irq(wm->pen_irq, wm);
 564         }
 565
 566         wm->pen_is_down = 0;
 567
 568         /* Balance out interrupt disables/enables */
 569         if (cancel_work_sync(&wm->pen_event_work))
 570                 wm->mach_ops->irq_enable(wm, 1);
 571
 572         /* ts_reader rearms itself so we need to explicitly stop it
 573          * before we destroy the workqueue.
 574          */
 575         cancel_delayed_work_sync(&wm->ts_reader);
 576
 577         destroy_workqueue(wm->ts_workq);
 578
 579         /* stop digitiser */
 580         wm->codec->dig_enable(wm, 0);
 581         if (wm->mach_ops && wm->mach_ops->acc_enabled)
 582                 wm->codec->acc_enable(wm, 0);
 583 }
 584
 585 static int wm97xx_register_touch(struct wm97xx *wm)
 586 {
 587         struct wm97xx_pdata *pdata = dev_get_platdata(wm->dev);
 588         int ret;
 589
 590         wm->input_dev = devm_input_allocate_device(wm->dev);
 591         if (wm->input_dev == NULL)
 592                 return -ENOMEM;
 593
 594         /* set up touch configuration */
 595         wm->input_dev->name = "wm97xx touchscreen";
 596         wm->input_dev->phys = "wm97xx";
 597         wm->input_dev->open = wm97xx_ts_input_open;
 598         wm->input_dev->close = wm97xx_ts_input_close;
 599
 600         __set_bit(EV_ABS, wm->input_dev->evbit);
 601         __set_bit(EV_KEY, wm->input_dev->evbit);
 602         __set_bit(BTN_TOUCH, wm->input_dev->keybit);
 603
 604         input_set_abs_params(wm->input_dev, ABS_X, abs_x[0], abs_x[1],
 605                              abs_x[2], 0);
 606         input_set_abs_params(wm->input_dev, ABS_Y, abs_y[0], abs_y[1],
 607                              abs_y[2], 0);
 608         input_set_abs_params(wm->input_dev, ABS_PRESSURE, abs_p[0], abs_p[1],
 609                              abs_p[2], 0);
 610
 611         input_set_drvdata(wm->input_dev, wm);
 612         wm->input_dev->dev.parent = wm->dev;
 613
 614         ret = input_register_device(wm->input_dev);
 615         if (ret)
 616                 return ret;
 617
 618         /*
 619          * register our extended touch device (for machine specific
 620          * extensions)
 621          */
 622         wm->touch_dev = platform_device_alloc("wm97xx-touch", -1);
 623         if (!wm->touch_dev) {
 624                 ret = -ENOMEM;
 625                 goto touch_err;
 626         }
 627         platform_set_drvdata(wm->touch_dev, wm);
 628         wm->touch_dev->dev.parent = wm->dev;
 629         wm->touch_dev->dev.platform_data = pdata;
 630         ret = platform_device_add(wm->touch_dev);
 631         if (ret < 0)
 632                 goto touch_reg_err;
 633
 634         return 0;
 635 touch_reg_err:
 636         platform_device_put(wm->touch_dev);
 637 touch_err:
 638         input_unregister_device(wm->input_dev);
 639         wm->input_dev = NULL;
 640
 641         return ret;
 642 }
 643
 644 static void wm97xx_unregister_touch(struct wm97xx *wm)
 645 {
 646         platform_device_unregister(wm->touch_dev);
 647         input_unregister_device(wm->input_dev);
 648         wm->input_dev = NULL;
 649 }
 650
 651 static int _wm97xx_probe(struct wm97xx *wm)
 652 {
 653         int id = 0;
 654
 655         mutex_init(&wm->codec_mutex);
 656         dev_set_drvdata(wm->dev, wm);
 657
 658         /* check that we have a supported codec */
 659         id = wm97xx_reg_read(wm, AC97_VENDOR_ID1);
 660         if (id != WM97XX_ID1) {
 661                 dev_err(wm->dev,
 662                         "Device with vendor %04x is not a wm97xx\n", id);
 663                 return -ENODEV;
 664         }
 665
 666         wm->id = wm97xx_reg_read(wm, AC97_VENDOR_ID2);
 667
 668         wm->variant = WM97xx_GENERIC;
 669
 670         dev_info(wm->dev, "detected a wm97%02x codec\n", wm->id & 0xff);
 671
 672         switch (wm->id & 0xff) {
 673 #ifdef CONFIG_TOUCHSCREEN_WM9705
 674         case 0x05:
 675                 wm->codec = &wm9705_codec;
 676                 break;
 677 #endif
 678 #ifdef CONFIG_TOUCHSCREEN_WM9712
 679         case 0x12:
 680                 wm->codec = &wm9712_codec;
 681                 break;
 682 #endif
 683 #ifdef CONFIG_TOUCHSCREEN_WM9713
 684         case 0x13:
 685                 wm->codec = &wm9713_codec;
 686                 break;
 687 #endif
 688         default:
 689                 dev_err(wm->dev, "Support for wm97%02x not compiled in.\n",
 690                         wm->id & 0xff);
 691                 return -ENODEV;
 692         }
 693
 694         /* set up physical characteristics */
 695         wm->codec->phy_init(wm);
 696
 697         /* load gpio cache */
 698         wm->gpio[0] = wm97xx_reg_read(wm, AC97_GPIO_CFG);
 699         wm->gpio[1] = wm97xx_reg_read(wm, AC97_GPIO_POLARITY);
 700         wm->gpio[2] = wm97xx_reg_read(wm, AC97_GPIO_STICKY);
 701         wm->gpio[3] = wm97xx_reg_read(wm, AC97_GPIO_WAKEUP);
 702         wm->gpio[4] = wm97xx_reg_read(wm, AC97_GPIO_STATUS);
 703         wm->gpio[5] = wm97xx_reg_read(wm, AC97_MISC_AFE);
 704
 705         return wm97xx_register_touch(wm);
 706 }
 707
 708 static void wm97xx_remove_battery(struct wm97xx *wm)
 709 {
 710         platform_device_unregister(wm->battery_dev);
 711 }
 712
 713 static int wm97xx_add_battery(struct wm97xx *wm,
 714                               struct wm97xx_batt_pdata *pdata)
 715 {
 716         int ret;
 717
 718         wm->battery_dev = platform_device_alloc("wm97xx-battery", -1);
 719         if (!wm->battery_dev)
 720                 return -ENOMEM;
 721
 722         platform_set_drvdata(wm->battery_dev, wm);
 723         wm->battery_dev->dev.parent = wm->dev;
 724         wm->battery_dev->dev.platform_data = pdata;
 725         ret = platform_device_add(wm->battery_dev);
 726         if (ret)
 727                 platform_device_put(wm->battery_dev);
 728
 729         return ret;
 730 }
 731
 732 static int wm97xx_probe(struct device *dev)
 733 {
 734         struct wm97xx *wm;
 735         int ret;
 736         struct wm97xx_pdata *pdata = dev_get_platdata(dev);
 737
 738         wm = devm_kzalloc(dev, sizeof(struct wm97xx), GFP_KERNEL);
 739         if (!wm)
 740                 return -ENOMEM;
 741
 742         wm->dev = dev;
 743         wm->ac97 = to_ac97_t(dev);
 744
 745         ret =  _wm97xx_probe(wm);
 746         if (ret)
 747                 return ret;
 748
 749         ret = wm97xx_add_battery(wm, pdata ? pdata->batt_pdata : NULL);
 750         if (ret < 0)
 751                 goto batt_err;
 752
 753         return ret;
 754
 755 batt_err:
 756         wm97xx_unregister_touch(wm);
 757         return ret;
 758 }
 759
 760 static int wm97xx_remove(struct device *dev)
 761 {
 762         struct wm97xx *wm = dev_get_drvdata(dev);
 763
 764         wm97xx_remove_battery(wm);
 765         wm97xx_unregister_touch(wm);
 766
 767         return 0;
 768 }
 769
 770 static int wm97xx_mfd_probe(struct platform_device *pdev)
 771 {
 772         struct wm97xx *wm;
 773         struct wm97xx_platform_data *mfd_pdata = dev_get_platdata(&pdev->dev);
 774         int ret;
 775
 776         wm = devm_kzalloc(&pdev->dev, sizeof(struct wm97xx), GFP_KERNEL);
 777         if (!wm)
 778                 return -ENOMEM;
 779
 780         wm->dev = &pdev->dev;
 781         wm->ac97 = mfd_pdata->ac97;
 782
 783         ret =  _wm97xx_probe(wm);
 784         if (ret)
 785                 return ret;
 786
 787         ret = wm97xx_add_battery(wm, mfd_pdata->batt_pdata);
 788         if (ret < 0)
 789                 goto batt_err;
 790
 791         return ret;
 792
 793 batt_err:
 794         wm97xx_unregister_touch(wm);
 795         return ret;
 796 }
 797
 798 static int wm97xx_mfd_remove(struct platform_device *pdev)
 799 {
 800         return wm97xx_remove(&pdev->dev);
 801 }
 802
 803 static int __maybe_unused wm97xx_suspend(struct device *dev)
 804 {
 805         struct wm97xx *wm = dev_get_drvdata(dev);
 806         u16 reg;
 807         int suspend_mode;
 808
 809         if (device_may_wakeup(&wm->input_dev->dev))
 810                 suspend_mode = wm->suspend_mode;
 811         else
 812                 suspend_mode = 0;
 813
 814         if (wm->input_dev->users)
 815                 cancel_delayed_work_sync(&wm->ts_reader);
 816
 817         /* Power down the digitiser (bypassing the cache for resume) */
 818         reg = wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER2);
 819         reg &= ~WM97XX_PRP_DET_DIG;
 820         if (wm->input_dev->users)
 821                 reg |= suspend_mode;
 822         wm->ac97->bus->ops->write(wm->ac97, AC97_WM97XX_DIGITISER2, reg);
 823
 824         /* WM9713 has an additional power bit - turn it off if there
 825          * are no users or if suspend mode is zero. */
 826         if (wm->id == WM9713_ID2 &&
 827             (!wm->input_dev->users || !suspend_mode)) {
 828                 reg = wm97xx_reg_read(wm, AC97_EXTENDED_MID) | 0x8000;
 829                 wm97xx_reg_write(wm, AC97_EXTENDED_MID, reg);
 830         }
 831
 832         return 0;
 833 }
 834
 835 static int __maybe_unused wm97xx_resume(struct device *dev)
 836 {
 837         struct wm97xx *wm = dev_get_drvdata(dev);
 838
 839         /* restore digitiser and gpios */
 840         if (wm->id == WM9713_ID2) {
 841                 wm97xx_reg_write(wm, AC97_WM9713_DIG1, wm->dig[0]);
 842                 wm97xx_reg_write(wm, 0x5a, wm->misc);
 843                 if (wm->input_dev->users) {
 844                         u16 reg;
 845                         reg = wm97xx_reg_read(wm, AC97_EXTENDED_MID) & 0x7fff;
 846                         wm97xx_reg_write(wm, AC97_EXTENDED_MID, reg);
 847                 }
 848         }
 849
 850         wm97xx_reg_write(wm, AC97_WM9713_DIG2, wm->dig[1]);
 851         wm97xx_reg_write(wm, AC97_WM9713_DIG3, wm->dig[2]);
 852
 853         wm97xx_reg_write(wm, AC97_GPIO_CFG, wm->gpio[0]);
 854         wm97xx_reg_write(wm, AC97_GPIO_POLARITY, wm->gpio[1]);
 855         wm97xx_reg_write(wm, AC97_GPIO_STICKY, wm->gpio[2]);
 856         wm97xx_reg_write(wm, AC97_GPIO_WAKEUP, wm->gpio[3]);
 857         wm97xx_reg_write(wm, AC97_GPIO_STATUS, wm->gpio[4]);
 858         wm97xx_reg_write(wm, AC97_MISC_AFE, wm->gpio[5]);
 859
 860         if (wm->input_dev->users && !wm->pen_irq) {
 861                 wm->ts_reader_interval = wm->ts_reader_min_interval;
 862                 queue_delayed_work(wm->ts_workq, &wm->ts_reader,
 863                                    wm->ts_reader_interval);
 864         }
 865
 866         return 0;
 867 }
 868
 869 static SIMPLE_DEV_PM_OPS(wm97xx_pm_ops, wm97xx_suspend, wm97xx_resume);
 870
 871 /*
 872  * Machine specific operations
 873  */
 874 int wm97xx_register_mach_ops(struct wm97xx *wm,
 875                              struct wm97xx_mach_ops *mach_ops)
 876 {
 877         mutex_lock(&wm->codec_mutex);
 878         if (wm->mach_ops) {
 879                 mutex_unlock(&wm->codec_mutex);
 880                 return -EINVAL;
 881         }
 882         wm->mach_ops = mach_ops;
 883         mutex_unlock(&wm->codec_mutex);
 884
 885         return 0;
 886 }
 887 EXPORT_SYMBOL_GPL(wm97xx_register_mach_ops);
 888
 889 void wm97xx_unregister_mach_ops(struct wm97xx *wm)
 890 {
 891         mutex_lock(&wm->codec_mutex);
 892         wm->mach_ops = NULL;
 893         mutex_unlock(&wm->codec_mutex);
 894 }
 895 EXPORT_SYMBOL_GPL(wm97xx_unregister_mach_ops);
 896
 897 static struct device_driver wm97xx_driver = {
 898         .name =         "wm97xx-ts",
 899 #ifdef CONFIG_AC97_BUS
 900         .bus =          &ac97_bus_type,
 901 #endif
 902         .owner =        THIS_MODULE,
 903         .probe =        wm97xx_probe,
 904         .remove =       wm97xx_remove,
 905         .pm =           &wm97xx_pm_ops,
 906 };
 907
 908 static struct platform_driver wm97xx_mfd_driver = {
 909         .driver = {
 910                 .name =         "wm97xx-ts",
 911                 .pm =           &wm97xx_pm_ops,
 912         },
 913         .probe =        wm97xx_mfd_probe,
 914         .remove =       wm97xx_mfd_remove,
 915 };
 916
 917 static int __init wm97xx_init(void)
 918 {
 919         int ret;
 920
 921         ret = platform_driver_register(&wm97xx_mfd_driver);
 922         if (ret)
 923                 return ret;
 924
 925         if (IS_BUILTIN(CONFIG_AC97_BUS))
 926                 ret =  driver_register(&wm97xx_driver);
 927         return ret;
 928 }
 929
 930 static void __exit wm97xx_exit(void)
 931 {
 932         if (IS_BUILTIN(CONFIG_AC97_BUS))
 933                 driver_unregister(&wm97xx_driver);
 934         platform_driver_unregister(&wm97xx_mfd_driver);
 935 }
 936
 937 module_init(wm97xx_init);
 938 module_exit(wm97xx_exit);
 939
 940 /* Module information */
 941 MODULE_AUTHOR("Liam Girdwood <lrg@slimlogic.co.uk>");
 942 MODULE_DESCRIPTION("WM97xx Core - Touch Screen / AUX ADC / GPIO Driver");
 943 MODULE_LICENSE("GPL");