drivers/input/touchscreen/wm97xx-core.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * wm97xx-core.c  --  Touch screen driver core for Wolfson WM9705, WM9712
   4  *                    and WM9713 AC97 Codecs.
   5  *
   6  * Copyright 2003, 2004, 2005, 2006, 2007, 2008 Wolfson Microelectronics PLC.
   7  * Author: Liam Girdwood <lrg@slimlogic.co.uk>
   8  * Parts Copyright : Ian Molton <spyro@f2s.com>
   9  *                   Andrew Zabolotny <zap@homelink.ru>
  10  *                   Russell King <rmk@arm.linux.org.uk>
  11  *
  12  * Notes:
  13  *
  14  *  Features:
  15  *       - supports WM9705, WM9712, WM9713
  16  *       - polling mode
  17  *       - continuous mode (arch-dependent)
  18  *       - adjustable rpu/dpp settings
  19  *       - adjustable pressure current
  20  *       - adjustable sample settle delay
  21  *       - 4 and 5 wire touchscreens (5 wire is WM9712 only)
  22  *       - pen down detection
  23  *       - battery monitor
  24  *       - sample AUX adcs
  25  *       - power management
  26  *       - codec GPIO
  27  *       - codec event notification
  28  * Todo
  29  *       - Support for async sampling control for noisy LCDs.
  30  */
  31
  32 #include <linux/module.h>
  33 #include <linux/moduleparam.h>
  34 #include <linux/kernel.h>
  35 #include <linux/init.h>
  36 #include <linux/delay.h>
  37 #include <linux/string.h>
  38 #include <linux/proc_fs.h>
  39 #include <linux/pm.h>
  40 #include <linux/interrupt.h>
  41 #include <linux/bitops.h>
  42 #include <linux/mfd/wm97xx.h>
  43 #include <linux/workqueue.h>
  44 #include <linux/wm97xx.h>
  45 #include <linux/uaccess.h>
  46 #include <linux/io.h>
  47 #include <linux/slab.h>
  48
  49 #define TS_NAME                 "wm97xx"
  50 #define WM_CORE_VERSION         "1.00"
  51 #define DEFAULT_PRESSURE        0xb0c0
  52
  53
  54 /*
  55  * Touchscreen absolute values
  56  *
  57  * These parameters are used to help the input layer discard out of
  58  * range readings and reduce jitter etc.
  59  *
  60  *   o min, max:- indicate the min and max values your touch screen returns
  61  *   o fuzz:- use a higher number to reduce jitter
  62  *
  63  * The default values correspond to Mainstone II in QVGA mode
  64  *
  65  * Please read
  66  * Documentation/input/input-programming.rst for more details.
  67  */
  68
  69 static int abs_x[3] = {150, 4000, 5};
  70 module_param_array(abs_x, int, NULL, 0);
  71 MODULE_PARM_DESC(abs_x, "Touchscreen absolute X min, max, fuzz");
  72
  73 static int abs_y[3] = {200, 4000, 40};
  74 module_param_array(abs_y, int, NULL, 0);
  75 MODULE_PARM_DESC(abs_y, "Touchscreen absolute Y min, max, fuzz");
  76
  77 static int abs_p[3] = {0, 150, 4};
  78 module_param_array(abs_p, int, NULL, 0);
  79 MODULE_PARM_DESC(abs_p, "Touchscreen absolute Pressure min, max, fuzz");
  80
  81 /*
  82  * wm97xx IO access, all IO locking done by AC97 layer
  83  */
  84 int wm97xx_reg_read(struct wm97xx *wm, u16 reg)
  85 {
  86         if (wm->ac97)
  87                 return wm->ac97->bus->ops->read(wm->ac97, reg);
  88         else
  89                 return -1;
  90 }
  91 EXPORT_SYMBOL_GPL(wm97xx_reg_read);
  92
  93 void wm97xx_reg_write(struct wm97xx *wm, u16 reg, u16 val)
  94 {
  95         /* cache digitiser registers */
  96         if (reg >= AC97_WM9713_DIG1 && reg <= AC97_WM9713_DIG3)
  97                 wm->dig[(reg - AC97_WM9713_DIG1) >> 1] = val;
  98
  99         /* cache gpio regs */
 100         if (reg >= AC97_GPIO_CFG && reg <= AC97_MISC_AFE)
 101                 wm->gpio[(reg - AC97_GPIO_CFG) >> 1] = val;
 102
 103         /* wm9713 irq reg */
 104         if (reg == 0x5a)
 105                 wm->misc = val;
 106
 107         if (wm->ac97)
 108                 wm->ac97->bus->ops->write(wm->ac97, reg, val);
 109 }
 110 EXPORT_SYMBOL_GPL(wm97xx_reg_write);
 111
 112 /**
 113  * wm97xx_read_aux_adc - Read the aux adc.
 114  * @wm: wm97xx device.
 115  * @adcsel: codec ADC to be read
 116  *
 117  * Reads the selected AUX ADC.
 118  */
 119
 120 int wm97xx_read_aux_adc(struct wm97xx *wm, u16 adcsel)
 121 {
 122         int power_adc = 0, auxval;
 123         u16 power = 0;
 124         int rc = 0;
 125         int timeout = 0;
 126
 127         /* get codec */
 128         mutex_lock(&wm->codec_mutex);
 129
 130         /* When the touchscreen is not in use, we may have to power up
 131          * the AUX ADC before we can use sample the AUX inputs->
 132          */
 133         if (wm->id == WM9713_ID2 &&
 134             (power = wm97xx_reg_read(wm, AC97_EXTENDED_MID)) & 0x8000) {
 135                 power_adc = 1;
 136                 wm97xx_reg_write(wm, AC97_EXTENDED_MID, power & 0x7fff);
 137         }
 138
 139         /* Prepare the codec for AUX reading */
 140         wm->codec->aux_prepare(wm);
 141
 142         /* Turn polling mode on to read AUX ADC */
 143         wm->pen_probably_down = 1;
 144
 145         while (rc != RC_VALID && timeout++ < 5)
 146                 rc = 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         if (timeout >= 5) {
 156                 dev_err(wm->dev,
 157                         "timeout reading auxadc %d, disabling digitiser\n",
 158                         adcsel);
 159                 wm->codec->dig_enable(wm, false);
 160         }
 161
 162         mutex_unlock(&wm->codec_mutex);
 163         return (rc == RC_VALID ? auxval & 0xfff : -EBUSY);
 164 }
 165 EXPORT_SYMBOL_GPL(wm97xx_read_aux_adc);
 166
 167 /**
 168  * wm97xx_get_gpio - Get the status of a codec GPIO.
 169  * @wm: wm97xx device.
 170  * @gpio: gpio
 171  *
 172  * Get the status of a codec GPIO pin
 173  */
 174
 175 enum wm97xx_gpio_status wm97xx_get_gpio(struct wm97xx *wm, u32 gpio)
 176 {
 177         u16 status;
 178         enum wm97xx_gpio_status ret;
 179
 180         mutex_lock(&wm->codec_mutex);
 181         status = wm97xx_reg_read(wm, AC97_GPIO_STATUS);
 182
 183         if (status & gpio)
 184                 ret = WM97XX_GPIO_HIGH;
 185         else
 186                 ret = WM97XX_GPIO_LOW;
 187
 188         mutex_unlock(&wm->codec_mutex);
 189         return ret;
 190 }
 191 EXPORT_SYMBOL_GPL(wm97xx_get_gpio);
 192
 193 /**
 194  * wm97xx_set_gpio - Set the status of a codec GPIO.
 195  * @wm: wm97xx device.
 196  * @gpio: gpio
 197  * @status: status
 198  *
 199  * Set the status of a codec GPIO pin
 200  */
 201
 202 void wm97xx_set_gpio(struct wm97xx *wm, u32 gpio,
 203                                 enum wm97xx_gpio_status status)
 204 {
 205         u16 reg;
 206
 207         mutex_lock(&wm->codec_mutex);
 208         reg = wm97xx_reg_read(wm, AC97_GPIO_STATUS);
 209
 210         if (status == WM97XX_GPIO_HIGH)
 211                 reg |= gpio;
 212         else
 213                 reg &= ~gpio;
 214
 215         if (wm->id == WM9712_ID2 && wm->variant != WM97xx_WM1613)
 216                 wm97xx_reg_write(wm, AC97_GPIO_STATUS, reg << 1);
 217         else
 218                 wm97xx_reg_write(wm, AC97_GPIO_STATUS, reg);
 219         mutex_unlock(&wm->codec_mutex);
 220 }
 221 EXPORT_SYMBOL_GPL(wm97xx_set_gpio);
 222
 223 /*
 224  * Codec GPIO pin configuration, this sets pin direction, polarity,
 225  * stickyness and wake up.
 226  */
 227 void wm97xx_config_gpio(struct wm97xx *wm, u32 gpio, enum wm97xx_gpio_dir dir,
 228                    enum wm97xx_gpio_pol pol, enum wm97xx_gpio_sticky sticky,
 229                    enum wm97xx_gpio_wake wake)
 230 {
 231         u16 reg;
 232
 233         mutex_lock(&wm->codec_mutex);
 234         reg = wm97xx_reg_read(wm, AC97_GPIO_POLARITY);
 235
 236         if (pol == WM97XX_GPIO_POL_HIGH)
 237                 reg |= gpio;
 238         else
 239                 reg &= ~gpio;
 240
 241         wm97xx_reg_write(wm, AC97_GPIO_POLARITY, reg);
 242         reg = wm97xx_reg_read(wm, AC97_GPIO_STICKY);
 243
 244         if (sticky == WM97XX_GPIO_STICKY)
 245                 reg |= gpio;
 246         else
 247                 reg &= ~gpio;
 248
 249         wm97xx_reg_write(wm, AC97_GPIO_STICKY, reg);
 250         reg = wm97xx_reg_read(wm, AC97_GPIO_WAKEUP);
 251
 252         if (wake == WM97XX_GPIO_WAKE)
 253                 reg |= gpio;
 254         else
 255                 reg &= ~gpio;
 256
 257         wm97xx_reg_write(wm, AC97_GPIO_WAKEUP, reg);
 258         reg = wm97xx_reg_read(wm, AC97_GPIO_CFG);
 259
 260         if (dir == WM97XX_GPIO_IN)
 261                 reg |= gpio;
 262         else
 263                 reg &= ~gpio;
 264
 265         wm97xx_reg_write(wm, AC97_GPIO_CFG, reg);
 266         mutex_unlock(&wm->codec_mutex);
 267 }
 268 EXPORT_SYMBOL_GPL(wm97xx_config_gpio);
 269
 270 /*
 271  * Configure the WM97XX_PRP value to use while system is suspended.
 272  * If a value other than 0 is set then WM97xx pen detection will be
 273  * left enabled in the configured mode while the system is in suspend,
 274  * the device has users and suspend has not been disabled via the
 275  * wakeup sysfs entries.
 276  *
 277  * @wm:   WM97xx device to configure
 278  * @mode: WM97XX_PRP value to configure while suspended
 279  */
 280 void wm97xx_set_suspend_mode(struct wm97xx *wm, u16 mode)
 281 {
 282         wm->suspend_mode = mode;
 283         device_init_wakeup(&wm->input_dev->dev, mode != 0);
 284 }
 285 EXPORT_SYMBOL_GPL(wm97xx_set_suspend_mode);
 286
 287 /*
 288  * Codec PENDOWN irq handler
 289  *
 290  */
 291 static irqreturn_t wm97xx_pen_interrupt(int irq, void *dev_id)
 292 {
 293         struct wm97xx *wm = dev_id;
 294         int pen_was_down = wm->pen_is_down;
 295
 296         /* do we need to enable the touch panel reader */
 297         if (wm->id == WM9705_ID2) {
 298                 if (wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER_RD) &
 299                                         WM97XX_PEN_DOWN)
 300                         wm->pen_is_down = 1;
 301                 else
 302                         wm->pen_is_down = 0;
 303         } else {
 304                 u16 status, pol;
 305                 mutex_lock(&wm->codec_mutex);
 306                 status = wm97xx_reg_read(wm, AC97_GPIO_STATUS);
 307                 pol = wm97xx_reg_read(wm, AC97_GPIO_POLARITY);
 308
 309                 if (WM97XX_GPIO_13 & pol & status) {
 310                         wm->pen_is_down = 1;
 311                         wm97xx_reg_write(wm, AC97_GPIO_POLARITY, pol &
 312                                                 ~WM97XX_GPIO_13);
 313                 } else {
 314                         wm->pen_is_down = 0;
 315                         wm97xx_reg_write(wm, AC97_GPIO_POLARITY, pol |
 316                                          WM97XX_GPIO_13);
 317                 }
 318
 319                 if (wm->id == WM9712_ID2 && wm->variant != WM97xx_WM1613)
 320                         wm97xx_reg_write(wm, AC97_GPIO_STATUS, (status &
 321                                                 ~WM97XX_GPIO_13) << 1);
 322                 else
 323                         wm97xx_reg_write(wm, AC97_GPIO_STATUS, status &
 324                                                 ~WM97XX_GPIO_13);
 325                 mutex_unlock(&wm->codec_mutex);
 326         }
 327
 328         /* If the system is not using continuous mode or it provides a
 329          * pen down operation then we need to schedule polls while the
 330          * pen is down.  Otherwise the machine driver is responsible
 331          * for scheduling reads.
 332          */
 333         if (!wm->mach_ops->acc_enabled || wm->mach_ops->acc_pen_down) {
 334                 if (wm->pen_is_down && !pen_was_down) {
 335                         /* Data is not available immediately on pen down */
 336                         queue_delayed_work(wm->ts_workq, &wm->ts_reader, 1);
 337                 }
 338
 339                 /* Let ts_reader report the pen up for debounce. */
 340                 if (!wm->pen_is_down && pen_was_down)
 341                         wm->pen_is_down = 1;
 342         }
 343
 344         if (!wm->pen_is_down && wm->mach_ops->acc_enabled)
 345                 wm->mach_ops->acc_pen_up(wm);
 346
 347         return IRQ_HANDLED;
 348 }
 349
 350 /*
 351  * initialise pen IRQ handler and workqueue
 352  */
 353 static int wm97xx_init_pen_irq(struct wm97xx *wm)
 354 {
 355         u16 reg;
 356
 357         if (request_threaded_irq(wm->pen_irq, NULL, wm97xx_pen_interrupt,
 358                                  IRQF_SHARED | IRQF_ONESHOT,
 359                                  "wm97xx-pen", wm)) {
 360                 dev_err(wm->dev,
 361                         "Failed to register pen down interrupt, polling");
 362                 wm->pen_irq = 0;
 363                 return -EINVAL;
 364         }
 365
 366         /* Configure GPIO as interrupt source on WM971x */
 367         if (wm->id != WM9705_ID2) {
 368                 BUG_ON(!wm->mach_ops->irq_gpio);
 369                 reg = wm97xx_reg_read(wm, AC97_MISC_AFE);
 370                 wm97xx_reg_write(wm, AC97_MISC_AFE,
 371                                 reg & ~(wm->mach_ops->irq_gpio));
 372                 reg = wm97xx_reg_read(wm, 0x5a);
 373                 wm97xx_reg_write(wm, 0x5a, reg & ~0x0001);
 374         }
 375
 376         return 0;
 377 }
 378
 379 static int wm97xx_read_samples(struct wm97xx *wm)
 380 {
 381         struct wm97xx_data data;
 382         int rc;
 383
 384         mutex_lock(&wm->codec_mutex);
 385
 386         if (wm->mach_ops && wm->mach_ops->acc_enabled)
 387                 rc = wm->mach_ops->acc_pen_down(wm);
 388         else
 389                 rc = wm->codec->poll_touch(wm, &data);
 390
 391         if (rc & RC_PENUP) {
 392                 if (wm->pen_is_down) {
 393                         wm->pen_is_down = 0;
 394                         dev_dbg(wm->dev, "pen up\n");
 395                         input_report_abs(wm->input_dev, ABS_PRESSURE, 0);
 396                         input_report_key(wm->input_dev, BTN_TOUCH, 0);
 397                         input_sync(wm->input_dev);
 398                 } else if (!(rc & RC_AGAIN)) {
 399                         /* We need high frequency updates only while
 400                         * pen is down, the user never will be able to
 401                         * touch screen faster than a few times per
 402                         * second... On the other hand, when the user
 403                         * is actively working with the touchscreen we
 404                         * don't want to lose the quick response. So we
 405                         * will slowly increase sleep time after the
 406                         * pen is up and quicky restore it to ~one task
 407                         * switch when pen is down again.
 408                         */
 409                         if (wm->ts_reader_interval < HZ / 10)
 410                                 wm->ts_reader_interval++;
 411                 }
 412
 413         } else if (rc & RC_VALID) {
 414                 dev_dbg(wm->dev,
 415                         "pen down: x=%x:%d, y=%x:%d, pressure=%x:%d\n",
 416                         data.x >> 12, data.x & 0xfff, data.y >> 12,
 417                         data.y & 0xfff, data.p >> 12, data.p & 0xfff);
 418
 419                 if (abs_x[0] > (data.x & 0xfff) ||
 420                     abs_x[1] < (data.x & 0xfff) ||
 421                     abs_y[0] > (data.y & 0xfff) ||
 422                     abs_y[1] < (data.y & 0xfff)) {
 423                         dev_dbg(wm->dev, "Measurement out of range, dropping it\n");
 424                         rc = RC_AGAIN;
 425                         goto out;
 426                 }
 427
 428                 input_report_abs(wm->input_dev, ABS_X, data.x & 0xfff);
 429                 input_report_abs(wm->input_dev, ABS_Y, data.y & 0xfff);
 430                 input_report_abs(wm->input_dev, ABS_PRESSURE, data.p & 0xfff);
 431                 input_report_key(wm->input_dev, BTN_TOUCH, 1);
 432                 input_sync(wm->input_dev);
 433                 wm->pen_is_down = 1;
 434                 wm->ts_reader_interval = wm->ts_reader_min_interval;
 435         } else if (rc & RC_PENDOWN) {
 436                 dev_dbg(wm->dev, "pen down\n");
 437                 wm->pen_is_down = 1;
 438                 wm->ts_reader_interval = wm->ts_reader_min_interval;
 439         }
 440
 441 out:
 442         mutex_unlock(&wm->codec_mutex);
 443         return rc;
 444 }
 445
 446 /*
 447 * The touchscreen sample reader.
 448 */
 449 static void wm97xx_ts_reader(struct work_struct *work)
 450 {
 451         int rc;
 452         struct wm97xx *wm = container_of(work, struct wm97xx, ts_reader.work);
 453
 454         BUG_ON(!wm->codec);
 455
 456         do {
 457                 rc = wm97xx_read_samples(wm);
 458         } while (rc & RC_AGAIN);
 459
 460         if (wm->pen_is_down || !wm->pen_irq)
 461                 queue_delayed_work(wm->ts_workq, &wm->ts_reader,
 462                                    wm->ts_reader_interval);
 463 }
 464
 465 /**
 466  * wm97xx_ts_input_open - Open the touch screen input device.
 467  * @idev:       Input device to be opened.
 468  *
 469  * Called by the input sub system to open a wm97xx touchscreen device.
 470  * Starts the touchscreen thread and touch digitiser.
 471  */
 472 static int wm97xx_ts_input_open(struct input_dev *idev)
 473 {
 474         struct wm97xx *wm = input_get_drvdata(idev);
 475
 476         wm->ts_workq = alloc_ordered_workqueue("kwm97xx", 0);
 477         if (wm->ts_workq == NULL) {
 478                 dev_err(wm->dev,
 479                         "Failed to create workqueue\n");
 480                 return -EINVAL;
 481         }
 482
 483         /* start digitiser */
 484         if (wm->mach_ops && wm->mach_ops->acc_enabled)
 485                 wm->codec->acc_enable(wm, 1);
 486         wm->codec->dig_enable(wm, 1);
 487
 488         INIT_DELAYED_WORK(&wm->ts_reader, wm97xx_ts_reader);
 489
 490         wm->ts_reader_min_interval = HZ >= 100 ? HZ / 100 : 1;
 491         if (wm->ts_reader_min_interval < 1)
 492                 wm->ts_reader_min_interval = 1;
 493         wm->ts_reader_interval = wm->ts_reader_min_interval;
 494
 495         wm->pen_is_down = 0;
 496         if (wm->pen_irq)
 497                 wm97xx_init_pen_irq(wm);
 498         else
 499                 dev_err(wm->dev, "No IRQ specified\n");
 500
 501         /* If we either don't have an interrupt for pen down events or
 502          * failed to acquire it then we need to poll.
 503          */
 504         if (wm->pen_irq == 0)
 505                 queue_delayed_work(wm->ts_workq, &wm->ts_reader,
 506                                    wm->ts_reader_interval);
 507
 508         return 0;
 509 }
 510
 511 /**
 512  * wm97xx_ts_input_close - Close the touch screen input device.
 513  * @idev:       Input device to be closed.
 514  *
 515  * Called by the input sub system to close a wm97xx touchscreen
 516  * device.  Kills the touchscreen thread and stops the touch
 517  * digitiser.
 518  */
 519
 520 static void wm97xx_ts_input_close(struct input_dev *idev)
 521 {
 522         struct wm97xx *wm = input_get_drvdata(idev);
 523         u16 reg;
 524
 525         if (wm->pen_irq) {
 526                 /* Return the interrupt to GPIO usage (disabling it) */
 527                 if (wm->id != WM9705_ID2) {
 528                         BUG_ON(!wm->mach_ops->irq_gpio);
 529                         reg = wm97xx_reg_read(wm, AC97_MISC_AFE);
 530                         wm97xx_reg_write(wm, AC97_MISC_AFE,
 531                                          reg | wm->mach_ops->irq_gpio);
 532                 }
 533
 534                 free_irq(wm->pen_irq, wm);
 535         }
 536
 537         wm->pen_is_down = 0;
 538
 539         /* ts_reader rearms itself so we need to explicitly stop it
 540          * before we destroy the workqueue.
 541          */
 542         cancel_delayed_work_sync(&wm->ts_reader);
 543
 544         destroy_workqueue(wm->ts_workq);
 545
 546         /* stop digitiser */
 547         wm->codec->dig_enable(wm, 0);
 548         if (wm->mach_ops && wm->mach_ops->acc_enabled)
 549                 wm->codec->acc_enable(wm, 0);
 550 }
 551
 552 static int wm97xx_register_touch(struct wm97xx *wm)
 553 {
 554         struct wm97xx_pdata *pdata = dev_get_platdata(wm->dev);
 555         int ret;
 556
 557         wm->input_dev = devm_input_allocate_device(wm->dev);
 558         if (wm->input_dev == NULL)
 559                 return -ENOMEM;
 560
 561         /* set up touch configuration */
 562         wm->input_dev->name = "wm97xx touchscreen";
 563         wm->input_dev->phys = "wm97xx";
 564         wm->input_dev->open = wm97xx_ts_input_open;
 565         wm->input_dev->close = wm97xx_ts_input_close;
 566
 567         __set_bit(EV_ABS, wm->input_dev->evbit);
 568         __set_bit(EV_KEY, wm->input_dev->evbit);
 569         __set_bit(BTN_TOUCH, wm->input_dev->keybit);
 570
 571         input_set_abs_params(wm->input_dev, ABS_X, abs_x[0], abs_x[1],
 572                              abs_x[2], 0);
 573         input_set_abs_params(wm->input_dev, ABS_Y, abs_y[0], abs_y[1],
 574                              abs_y[2], 0);
 575         input_set_abs_params(wm->input_dev, ABS_PRESSURE, abs_p[0], abs_p[1],
 576                              abs_p[2], 0);
 577
 578         input_set_drvdata(wm->input_dev, wm);
 579         wm->input_dev->dev.parent = wm->dev;
 580
 581         ret = input_register_device(wm->input_dev);
 582         if (ret)
 583                 return ret;
 584
 585         /*
 586          * register our extended touch device (for machine specific
 587          * extensions)
 588          */
 589         wm->touch_dev = platform_device_alloc("wm97xx-touch", -1);
 590         if (!wm->touch_dev)
 591                 return -ENOMEM;
 592
 593         platform_set_drvdata(wm->touch_dev, wm);
 594         wm->touch_dev->dev.parent = wm->dev;
 595         wm->touch_dev->dev.platform_data = pdata;
 596         ret = platform_device_add(wm->touch_dev);
 597         if (ret < 0)
 598                 goto touch_reg_err;
 599
 600         return 0;
 601 touch_reg_err:
 602         platform_device_put(wm->touch_dev);
 603
 604         return ret;
 605 }
 606
 607 static void wm97xx_unregister_touch(struct wm97xx *wm)
 608 {
 609         platform_device_unregister(wm->touch_dev);
 610 }
 611
 612 static int _wm97xx_probe(struct wm97xx *wm)
 613 {
 614         int id = 0;
 615
 616         mutex_init(&wm->codec_mutex);
 617         dev_set_drvdata(wm->dev, wm);
 618
 619         /* check that we have a supported codec */
 620         id = wm97xx_reg_read(wm, AC97_VENDOR_ID1);
 621         if (id != WM97XX_ID1) {
 622                 dev_err(wm->dev,
 623                         "Device with vendor %04x is not a wm97xx\n", id);
 624                 return -ENODEV;
 625         }
 626
 627         wm->id = wm97xx_reg_read(wm, AC97_VENDOR_ID2);
 628
 629         wm->variant = WM97xx_GENERIC;
 630
 631         dev_info(wm->dev, "detected a wm97%02x codec\n", wm->id & 0xff);
 632
 633         switch (wm->id & 0xff) {
 634 #ifdef CONFIG_TOUCHSCREEN_WM9705
 635         case 0x05:
 636                 wm->codec = &wm9705_codec;
 637                 break;
 638 #endif
 639 #ifdef CONFIG_TOUCHSCREEN_WM9712
 640         case 0x12:
 641                 wm->codec = &wm9712_codec;
 642                 break;
 643 #endif
 644 #ifdef CONFIG_TOUCHSCREEN_WM9713
 645         case 0x13:
 646                 wm->codec = &wm9713_codec;
 647                 break;
 648 #endif
 649         default:
 650                 dev_err(wm->dev, "Support for wm97%02x not compiled in.\n",
 651                         wm->id & 0xff);
 652                 return -ENODEV;
 653         }
 654
 655         /* set up physical characteristics */
 656         wm->codec->phy_init(wm);
 657
 658         /* load gpio cache */
 659         wm->gpio[0] = wm97xx_reg_read(wm, AC97_GPIO_CFG);
 660         wm->gpio[1] = wm97xx_reg_read(wm, AC97_GPIO_POLARITY);
 661         wm->gpio[2] = wm97xx_reg_read(wm, AC97_GPIO_STICKY);
 662         wm->gpio[3] = wm97xx_reg_read(wm, AC97_GPIO_WAKEUP);
 663         wm->gpio[4] = wm97xx_reg_read(wm, AC97_GPIO_STATUS);
 664         wm->gpio[5] = wm97xx_reg_read(wm, AC97_MISC_AFE);
 665
 666         return wm97xx_register_touch(wm);
 667 }
 668
 669 static void wm97xx_remove_battery(struct wm97xx *wm)
 670 {
 671         platform_device_unregister(wm->battery_dev);
 672 }
 673
 674 static int wm97xx_add_battery(struct wm97xx *wm,
 675                               struct wm97xx_batt_pdata *pdata)
 676 {
 677         int ret;
 678
 679         wm->battery_dev = platform_device_alloc("wm97xx-battery", -1);
 680         if (!wm->battery_dev)
 681                 return -ENOMEM;
 682
 683         platform_set_drvdata(wm->battery_dev, wm);
 684         wm->battery_dev->dev.parent = wm->dev;
 685         wm->battery_dev->dev.platform_data = pdata;
 686         ret = platform_device_add(wm->battery_dev);
 687         if (ret)
 688                 platform_device_put(wm->battery_dev);
 689
 690         return ret;
 691 }
 692
 693 static int wm97xx_probe(struct device *dev)
 694 {
 695         struct wm97xx *wm;
 696         int ret;
 697         struct wm97xx_pdata *pdata = dev_get_platdata(dev);
 698
 699         wm = devm_kzalloc(dev, sizeof(struct wm97xx), GFP_KERNEL);
 700         if (!wm)
 701                 return -ENOMEM;
 702
 703         wm->dev = dev;
 704         wm->ac97 = to_ac97_t(dev);
 705
 706         ret =  _wm97xx_probe(wm);
 707         if (ret)
 708                 return ret;
 709
 710         ret = wm97xx_add_battery(wm, pdata ? pdata->batt_pdata : NULL);
 711         if (ret < 0)
 712                 goto batt_err;
 713
 714         return ret;
 715
 716 batt_err:
 717         wm97xx_unregister_touch(wm);
 718         return ret;
 719 }
 720
 721 static int wm97xx_remove(struct device *dev)
 722 {
 723         struct wm97xx *wm = dev_get_drvdata(dev);
 724
 725         wm97xx_remove_battery(wm);
 726         wm97xx_unregister_touch(wm);
 727
 728         return 0;
 729 }
 730
 731 static int wm97xx_mfd_probe(struct platform_device *pdev)
 732 {
 733         struct wm97xx *wm;
 734         struct wm97xx_platform_data *mfd_pdata = dev_get_platdata(&pdev->dev);
 735         int ret;
 736
 737         wm = devm_kzalloc(&pdev->dev, sizeof(struct wm97xx), GFP_KERNEL);
 738         if (!wm)
 739                 return -ENOMEM;
 740
 741         wm->dev = &pdev->dev;
 742         wm->ac97 = mfd_pdata->ac97;
 743
 744         ret =  _wm97xx_probe(wm);
 745         if (ret)
 746                 return ret;
 747
 748         ret = wm97xx_add_battery(wm, mfd_pdata->batt_pdata);
 749         if (ret < 0)
 750                 goto batt_err;
 751
 752         return ret;
 753
 754 batt_err:
 755         wm97xx_unregister_touch(wm);
 756         return ret;
 757 }
 758
 759 static int wm97xx_mfd_remove(struct platform_device *pdev)
 760 {
 761         wm97xx_remove(&pdev->dev);
 762
 763         return 0;
 764 }
 765
 766 static int __maybe_unused wm97xx_suspend(struct device *dev)
 767 {
 768         struct wm97xx *wm = dev_get_drvdata(dev);
 769         u16 reg;
 770         int suspend_mode;
 771
 772         if (device_may_wakeup(&wm->input_dev->dev))
 773                 suspend_mode = wm->suspend_mode;
 774         else
 775                 suspend_mode = 0;
 776
 777         mutex_lock(&wm->input_dev->mutex);
 778         if (input_device_enabled(wm->input_dev))
 779                 cancel_delayed_work_sync(&wm->ts_reader);
 780
 781         /* Power down the digitiser (bypassing the cache for resume) */
 782         reg = wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER2);
 783         reg &= ~WM97XX_PRP_DET_DIG;
 784         if (input_device_enabled(wm->input_dev))
 785                 reg |= suspend_mode;
 786         wm->ac97->bus->ops->write(wm->ac97, AC97_WM97XX_DIGITISER2, reg);
 787
 788         /* WM9713 has an additional power bit - turn it off if there
 789          * are no users or if suspend mode is zero. */
 790         if (wm->id == WM9713_ID2 &&
 791             (!input_device_enabled(wm->input_dev) || !suspend_mode)) {
 792                 reg = wm97xx_reg_read(wm, AC97_EXTENDED_MID) | 0x8000;
 793                 wm97xx_reg_write(wm, AC97_EXTENDED_MID, reg);
 794         }
 795         mutex_unlock(&wm->input_dev->mutex);
 796
 797         return 0;
 798 }
 799
 800 static int __maybe_unused wm97xx_resume(struct device *dev)
 801 {
 802         struct wm97xx *wm = dev_get_drvdata(dev);
 803
 804         mutex_lock(&wm->input_dev->mutex);
 805         /* restore digitiser and gpios */
 806         if (wm->id == WM9713_ID2) {
 807                 wm97xx_reg_write(wm, AC97_WM9713_DIG1, wm->dig[0]);
 808                 wm97xx_reg_write(wm, 0x5a, wm->misc);
 809                 if (input_device_enabled(wm->input_dev)) {
 810                         u16 reg;
 811                         reg = wm97xx_reg_read(wm, AC97_EXTENDED_MID) & 0x7fff;
 812                         wm97xx_reg_write(wm, AC97_EXTENDED_MID, reg);
 813                 }
 814         }
 815
 816         wm97xx_reg_write(wm, AC97_WM9713_DIG2, wm->dig[1]);
 817         wm97xx_reg_write(wm, AC97_WM9713_DIG3, wm->dig[2]);
 818
 819         wm97xx_reg_write(wm, AC97_GPIO_CFG, wm->gpio[0]);
 820         wm97xx_reg_write(wm, AC97_GPIO_POLARITY, wm->gpio[1]);
 821         wm97xx_reg_write(wm, AC97_GPIO_STICKY, wm->gpio[2]);
 822         wm97xx_reg_write(wm, AC97_GPIO_WAKEUP, wm->gpio[3]);
 823         wm97xx_reg_write(wm, AC97_GPIO_STATUS, wm->gpio[4]);
 824         wm97xx_reg_write(wm, AC97_MISC_AFE, wm->gpio[5]);
 825
 826         if (input_device_enabled(wm->input_dev) && !wm->pen_irq) {
 827                 wm->ts_reader_interval = wm->ts_reader_min_interval;
 828                 queue_delayed_work(wm->ts_workq, &wm->ts_reader,
 829                                    wm->ts_reader_interval);
 830         }
 831         mutex_unlock(&wm->input_dev->mutex);
 832
 833         return 0;
 834 }
 835
 836 static SIMPLE_DEV_PM_OPS(wm97xx_pm_ops, wm97xx_suspend, wm97xx_resume);
 837
 838 /*
 839  * Machine specific operations
 840  */
 841 int wm97xx_register_mach_ops(struct wm97xx *wm,
 842                              struct wm97xx_mach_ops *mach_ops)
 843 {
 844         mutex_lock(&wm->codec_mutex);
 845         if (wm->mach_ops) {
 846                 mutex_unlock(&wm->codec_mutex);
 847                 return -EINVAL;
 848         }
 849         wm->mach_ops = mach_ops;
 850         mutex_unlock(&wm->codec_mutex);
 851
 852         return 0;
 853 }
 854 EXPORT_SYMBOL_GPL(wm97xx_register_mach_ops);
 855
 856 void wm97xx_unregister_mach_ops(struct wm97xx *wm)
 857 {
 858         mutex_lock(&wm->codec_mutex);
 859         wm->mach_ops = NULL;
 860         mutex_unlock(&wm->codec_mutex);
 861 }
 862 EXPORT_SYMBOL_GPL(wm97xx_unregister_mach_ops);
 863
 864 static struct device_driver wm97xx_driver = {
 865         .name =         "wm97xx-ts",
 866 #ifdef CONFIG_AC97_BUS
 867         .bus =          &ac97_bus_type,
 868 #endif
 869         .owner =        THIS_MODULE,
 870         .probe =        wm97xx_probe,
 871         .remove =       wm97xx_remove,
 872         .pm =           &wm97xx_pm_ops,
 873 };
 874
 875 static struct platform_driver wm97xx_mfd_driver = {
 876         .driver = {
 877                 .name =         "wm97xx-ts",
 878                 .pm =           &wm97xx_pm_ops,
 879         },
 880         .probe =        wm97xx_mfd_probe,
 881         .remove =       wm97xx_mfd_remove,
 882 };
 883
 884 static int __init wm97xx_init(void)
 885 {
 886         int ret;
 887
 888         ret = platform_driver_register(&wm97xx_mfd_driver);
 889         if (ret)
 890                 return ret;
 891
 892         if (IS_BUILTIN(CONFIG_AC97_BUS))
 893                 ret =  driver_register(&wm97xx_driver);
 894         return ret;
 895 }
 896
 897 static void __exit wm97xx_exit(void)
 898 {
 899         if (IS_BUILTIN(CONFIG_AC97_BUS))
 900                 driver_unregister(&wm97xx_driver);
 901         platform_driver_unregister(&wm97xx_mfd_driver);
 902 }
 903
 904 module_init(wm97xx_init);
 905 module_exit(wm97xx_exit);
 906
 907 /* Module information */
 908 MODULE_AUTHOR("Liam Girdwood <lrg@slimlogic.co.uk>");
 909 MODULE_DESCRIPTION("WM97xx Core - Touch Screen / AUX ADC / GPIO Driver");
 910 MODULE_LICENSE("GPL");