root/drivers/input/touchscreen/wm97xx-core.c

DEFINITIONS

1. wm97xx_reg_read
2. wm97xx_reg_write
3. wm97xx_read_aux_adc
4. wm97xx_get_gpio
5. wm97xx_set_gpio
6. wm97xx_config_gpio
7. wm97xx_set_suspend_mode
8. wm97xx_pen_irq_worker
9. wm97xx_pen_interrupt
10. wm97xx_init_pen_irq
11. wm97xx_read_samples
12. wm97xx_ts_reader
13. wm97xx_ts_input_open
14. wm97xx_ts_input_close
15. wm97xx_register_touch
16. wm97xx_unregister_touch
17. _wm97xx_probe
18. wm97xx_remove_battery
19. wm97xx_add_battery
20. wm97xx_probe
21. wm97xx_remove
22. wm97xx_mfd_probe
23. wm97xx_mfd_remove
24. wm97xx_suspend
25. wm97xx_resume
26. wm97xx_register_mach_ops
27. wm97xx_unregister_mach_ops
28. wm97xx_init
29. wm97xx_exit

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