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 void wm97xx_mfd_remove(struct platform_device *pdev) 760 { 761 wm97xx_remove(&pdev->dev); 762 } 763 764 static int wm97xx_suspend(struct device *dev) 765 { 766 struct wm97xx *wm = dev_get_drvdata(dev); 767 u16 reg; 768 int suspend_mode; 769 770 if (device_may_wakeup(&wm->input_dev->dev)) 771 suspend_mode = wm->suspend_mode; 772 else 773 suspend_mode = 0; 774 775 mutex_lock(&wm->input_dev->mutex); 776 if (input_device_enabled(wm->input_dev)) 777 cancel_delayed_work_sync(&wm->ts_reader); 778 779 /* Power down the digitiser (bypassing the cache for resume) */ 780 reg = wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER2); 781 reg &= ~WM97XX_PRP_DET_DIG; 782 if (input_device_enabled(wm->input_dev)) 783 reg |= suspend_mode; 784 wm->ac97->bus->ops->write(wm->ac97, AC97_WM97XX_DIGITISER2, reg); 785 786 /* WM9713 has an additional power bit - turn it off if there 787 * are no users or if suspend mode is zero. */ 788 if (wm->id == WM9713_ID2 && 789 (!input_device_enabled(wm->input_dev) || !suspend_mode)) { 790 reg = wm97xx_reg_read(wm, AC97_EXTENDED_MID) | 0x8000; 791 wm97xx_reg_write(wm, AC97_EXTENDED_MID, reg); 792 } 793 mutex_unlock(&wm->input_dev->mutex); 794 795 return 0; 796 } 797 798 static int wm97xx_resume(struct device *dev) 799 { 800 struct wm97xx *wm = dev_get_drvdata(dev); 801 802 mutex_lock(&wm->input_dev->mutex); 803 /* restore digitiser and gpios */ 804 if (wm->id == WM9713_ID2) { 805 wm97xx_reg_write(wm, AC97_WM9713_DIG1, wm->dig[0]); 806 wm97xx_reg_write(wm, 0x5a, wm->misc); 807 if (input_device_enabled(wm->input_dev)) { 808 u16 reg; 809 reg = wm97xx_reg_read(wm, AC97_EXTENDED_MID) & 0x7fff; 810 wm97xx_reg_write(wm, AC97_EXTENDED_MID, reg); 811 } 812 } 813 814 wm97xx_reg_write(wm, AC97_WM9713_DIG2, wm->dig[1]); 815 wm97xx_reg_write(wm, AC97_WM9713_DIG3, wm->dig[2]); 816 817 wm97xx_reg_write(wm, AC97_GPIO_CFG, wm->gpio[0]); 818 wm97xx_reg_write(wm, AC97_GPIO_POLARITY, wm->gpio[1]); 819 wm97xx_reg_write(wm, AC97_GPIO_STICKY, wm->gpio[2]); 820 wm97xx_reg_write(wm, AC97_GPIO_WAKEUP, wm->gpio[3]); 821 wm97xx_reg_write(wm, AC97_GPIO_STATUS, wm->gpio[4]); 822 wm97xx_reg_write(wm, AC97_MISC_AFE, wm->gpio[5]); 823 824 if (input_device_enabled(wm->input_dev) && !wm->pen_irq) { 825 wm->ts_reader_interval = wm->ts_reader_min_interval; 826 queue_delayed_work(wm->ts_workq, &wm->ts_reader, 827 wm->ts_reader_interval); 828 } 829 mutex_unlock(&wm->input_dev->mutex); 830 831 return 0; 832 } 833 834 static DEFINE_SIMPLE_DEV_PM_OPS(wm97xx_pm_ops, wm97xx_suspend, wm97xx_resume); 835 836 /* 837 * Machine specific operations 838 */ 839 int wm97xx_register_mach_ops(struct wm97xx *wm, 840 struct wm97xx_mach_ops *mach_ops) 841 { 842 mutex_lock(&wm->codec_mutex); 843 if (wm->mach_ops) { 844 mutex_unlock(&wm->codec_mutex); 845 return -EINVAL; 846 } 847 wm->mach_ops = mach_ops; 848 mutex_unlock(&wm->codec_mutex); 849 850 return 0; 851 } 852 EXPORT_SYMBOL_GPL(wm97xx_register_mach_ops); 853 854 void wm97xx_unregister_mach_ops(struct wm97xx *wm) 855 { 856 mutex_lock(&wm->codec_mutex); 857 wm->mach_ops = NULL; 858 mutex_unlock(&wm->codec_mutex); 859 } 860 EXPORT_SYMBOL_GPL(wm97xx_unregister_mach_ops); 861 862 static struct device_driver wm97xx_driver = { 863 .name = "wm97xx-ts", 864 #ifdef CONFIG_AC97_BUS 865 .bus = &ac97_bus_type, 866 #endif 867 .owner = THIS_MODULE, 868 .probe = wm97xx_probe, 869 .remove = wm97xx_remove, 870 .pm = pm_sleep_ptr(&wm97xx_pm_ops), 871 }; 872 873 static struct platform_driver wm97xx_mfd_driver = { 874 .driver = { 875 .name = "wm97xx-ts", 876 .pm = pm_sleep_ptr(&wm97xx_pm_ops), 877 }, 878 .probe = wm97xx_mfd_probe, 879 .remove_new = wm97xx_mfd_remove, 880 }; 881 882 static int __init wm97xx_init(void) 883 { 884 int ret; 885 886 ret = platform_driver_register(&wm97xx_mfd_driver); 887 if (ret) 888 return ret; 889 890 if (IS_BUILTIN(CONFIG_AC97_BUS)) 891 ret = driver_register(&wm97xx_driver); 892 return ret; 893 } 894 895 static void __exit wm97xx_exit(void) 896 { 897 if (IS_BUILTIN(CONFIG_AC97_BUS)) 898 driver_unregister(&wm97xx_driver); 899 platform_driver_unregister(&wm97xx_mfd_driver); 900 } 901 902 module_init(wm97xx_init); 903 module_exit(wm97xx_exit); 904 905 /* Module information */ 906 MODULE_AUTHOR("Liam Girdwood <lrg@slimlogic.co.uk>"); 907 MODULE_DESCRIPTION("WM97xx Core - Touch Screen / AUX ADC / GPIO Driver"); 908 MODULE_LICENSE("GPL"); 909