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/export.h> 33 #include <linux/module.h> 34 #include <linux/moduleparam.h> 35 #include <linux/kernel.h> 36 #include <linux/init.h> 37 #include <linux/delay.h> 38 #include <linux/string.h> 39 #include <linux/proc_fs.h> 40 #include <linux/pm.h> 41 #include <linux/interrupt.h> 42 #include <linux/bitops.h> 43 #include <linux/mfd/wm97xx.h> 44 #include <linux/workqueue.h> 45 #include <linux/wm97xx.h> 46 #include <linux/uaccess.h> 47 #include <linux/io.h> 48 #include <linux/slab.h> 49 50 #define TS_NAME "wm97xx" 51 #define WM_CORE_VERSION "1.00" 52 #define DEFAULT_PRESSURE 0xb0c0 53 54 55 /* 56 * Touchscreen absolute values 57 * 58 * These parameters are used to help the input layer discard out of 59 * range readings and reduce jitter etc. 60 * 61 * o min, max:- indicate the min and max values your touch screen returns 62 * o fuzz:- use a higher number to reduce jitter 63 * 64 * The default values correspond to Mainstone II in QVGA mode 65 * 66 * Please read 67 * Documentation/input/input-programming.rst for more details. 68 */ 69 70 static int abs_x[3] = {150, 4000, 5}; 71 module_param_array(abs_x, int, NULL, 0); 72 MODULE_PARM_DESC(abs_x, "Touchscreen absolute X min, max, fuzz"); 73 74 static int abs_y[3] = {200, 4000, 40}; 75 module_param_array(abs_y, int, NULL, 0); 76 MODULE_PARM_DESC(abs_y, "Touchscreen absolute Y min, max, fuzz"); 77 78 static int abs_p[3] = {0, 150, 4}; 79 module_param_array(abs_p, int, NULL, 0); 80 MODULE_PARM_DESC(abs_p, "Touchscreen absolute Pressure min, max, fuzz"); 81 82 /* 83 * wm97xx IO access, all IO locking done by AC97 layer 84 */ 85 int wm97xx_reg_read(struct wm97xx *wm, u16 reg) 86 { 87 if (wm->ac97) 88 return wm->ac97->bus->ops->read(wm->ac97, reg); 89 else 90 return -1; 91 } 92 EXPORT_SYMBOL_GPL(wm97xx_reg_read); 93 94 void wm97xx_reg_write(struct wm97xx *wm, u16 reg, u16 val) 95 { 96 /* cache digitiser registers */ 97 if (reg >= AC97_WM9713_DIG1 && reg <= AC97_WM9713_DIG3) 98 wm->dig[(reg - AC97_WM9713_DIG1) >> 1] = val; 99 100 /* cache gpio regs */ 101 if (reg >= AC97_GPIO_CFG && reg <= AC97_MISC_AFE) 102 wm->gpio[(reg - AC97_GPIO_CFG) >> 1] = val; 103 104 /* wm9713 irq reg */ 105 if (reg == 0x5a) 106 wm->misc = val; 107 108 if (wm->ac97) 109 wm->ac97->bus->ops->write(wm->ac97, reg, val); 110 } 111 EXPORT_SYMBOL_GPL(wm97xx_reg_write); 112 113 /** 114 * wm97xx_read_aux_adc - Read the aux adc. 115 * @wm: wm97xx device. 116 * @adcsel: codec ADC to be read 117 * 118 * Reads the selected AUX ADC. 119 */ 120 121 int wm97xx_read_aux_adc(struct wm97xx *wm, u16 adcsel) 122 { 123 int power_adc = 0, auxval; 124 u16 power = 0; 125 int rc = 0; 126 int timeout = 0; 127 128 /* get codec */ 129 guard(mutex)(&wm->codec_mutex); 130 131 /* When the touchscreen is not in use, we may have to power up 132 * the AUX ADC before we can use sample the AUX inputs-> 133 */ 134 if (wm->id == WM9713_ID2 && 135 (power = wm97xx_reg_read(wm, AC97_EXTENDED_MID)) & 0x8000) { 136 power_adc = 1; 137 wm97xx_reg_write(wm, AC97_EXTENDED_MID, power & 0x7fff); 138 } 139 140 /* Prepare the codec for AUX reading */ 141 wm->codec->aux_prepare(wm); 142 143 /* Turn polling mode on to read AUX ADC */ 144 wm->pen_probably_down = 1; 145 146 while (rc != RC_VALID && timeout++ < 5) 147 rc = wm->codec->poll_sample(wm, adcsel, &auxval); 148 149 if (power_adc) 150 wm97xx_reg_write(wm, AC97_EXTENDED_MID, power | 0x8000); 151 152 wm->codec->dig_restore(wm); 153 154 wm->pen_probably_down = 0; 155 156 if (timeout >= 5) { 157 dev_err(wm->dev, 158 "timeout reading auxadc %d, disabling digitiser\n", 159 adcsel); 160 wm->codec->dig_enable(wm, false); 161 } 162 163 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; 178 179 guard(mutex)(&wm->codec_mutex); 180 181 status = wm97xx_reg_read(wm, AC97_GPIO_STATUS); 182 return (status & gpio) ? WM97XX_GPIO_HIGH : WM97XX_GPIO_LOW; 183 } 184 EXPORT_SYMBOL_GPL(wm97xx_get_gpio); 185 186 /** 187 * wm97xx_set_gpio - Set the status of a codec GPIO. 188 * @wm: wm97xx device. 189 * @gpio: gpio 190 * @status: status 191 * 192 * Set the status of a codec GPIO pin 193 */ 194 195 void wm97xx_set_gpio(struct wm97xx *wm, u32 gpio, 196 enum wm97xx_gpio_status status) 197 { 198 u16 reg; 199 200 guard(mutex)(&wm->codec_mutex); 201 202 reg = wm97xx_reg_read(wm, AC97_GPIO_STATUS); 203 204 if (status == WM97XX_GPIO_HIGH) 205 reg |= gpio; 206 else 207 reg &= ~gpio; 208 209 if (wm->id == WM9712_ID2 && wm->variant != WM97xx_WM1613) 210 wm97xx_reg_write(wm, AC97_GPIO_STATUS, reg << 1); 211 else 212 wm97xx_reg_write(wm, AC97_GPIO_STATUS, reg); 213 } 214 EXPORT_SYMBOL_GPL(wm97xx_set_gpio); 215 216 /* 217 * Codec GPIO pin configuration, this sets pin direction, polarity, 218 * stickiness and wake up. 219 */ 220 void wm97xx_config_gpio(struct wm97xx *wm, u32 gpio, enum wm97xx_gpio_dir dir, 221 enum wm97xx_gpio_pol pol, enum wm97xx_gpio_sticky sticky, 222 enum wm97xx_gpio_wake wake) 223 { 224 u16 reg; 225 226 guard(mutex)(&wm->codec_mutex); 227 228 reg = wm97xx_reg_read(wm, AC97_GPIO_POLARITY); 229 230 if (pol == WM97XX_GPIO_POL_HIGH) 231 reg |= gpio; 232 else 233 reg &= ~gpio; 234 235 wm97xx_reg_write(wm, AC97_GPIO_POLARITY, reg); 236 reg = wm97xx_reg_read(wm, AC97_GPIO_STICKY); 237 238 if (sticky == WM97XX_GPIO_STICKY) 239 reg |= gpio; 240 else 241 reg &= ~gpio; 242 243 wm97xx_reg_write(wm, AC97_GPIO_STICKY, reg); 244 reg = wm97xx_reg_read(wm, AC97_GPIO_WAKEUP); 245 246 if (wake == WM97XX_GPIO_WAKE) 247 reg |= gpio; 248 else 249 reg &= ~gpio; 250 251 wm97xx_reg_write(wm, AC97_GPIO_WAKEUP, reg); 252 reg = wm97xx_reg_read(wm, AC97_GPIO_CFG); 253 254 if (dir == WM97XX_GPIO_IN) 255 reg |= gpio; 256 else 257 reg &= ~gpio; 258 259 wm97xx_reg_write(wm, AC97_GPIO_CFG, reg); 260 } 261 EXPORT_SYMBOL_GPL(wm97xx_config_gpio); 262 263 /* 264 * Configure the WM97XX_PRP value to use while system is suspended. 265 * If a value other than 0 is set then WM97xx pen detection will be 266 * left enabled in the configured mode while the system is in suspend, 267 * the device has users and suspend has not been disabled via the 268 * wakeup sysfs entries. 269 * 270 * @wm: WM97xx device to configure 271 * @mode: WM97XX_PRP value to configure while suspended 272 */ 273 void wm97xx_set_suspend_mode(struct wm97xx *wm, u16 mode) 274 { 275 wm->suspend_mode = mode; 276 device_init_wakeup(&wm->input_dev->dev, mode != 0); 277 } 278 EXPORT_SYMBOL_GPL(wm97xx_set_suspend_mode); 279 280 /* 281 * Codec PENDOWN irq handler 282 * 283 */ 284 static irqreturn_t wm97xx_pen_interrupt(int irq, void *dev_id) 285 { 286 struct wm97xx *wm = dev_id; 287 int pen_was_down = wm->pen_is_down; 288 289 /* do we need to enable the touch panel reader */ 290 if (wm->id == WM9705_ID2) { 291 if (wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER_RD) & 292 WM97XX_PEN_DOWN) 293 wm->pen_is_down = 1; 294 else 295 wm->pen_is_down = 0; 296 } else { 297 u16 status, pol; 298 299 guard(mutex)(&wm->codec_mutex); 300 301 status = wm97xx_reg_read(wm, AC97_GPIO_STATUS); 302 pol = wm97xx_reg_read(wm, AC97_GPIO_POLARITY); 303 304 if (WM97XX_GPIO_13 & pol & status) { 305 wm->pen_is_down = 1; 306 wm97xx_reg_write(wm, AC97_GPIO_POLARITY, pol & 307 ~WM97XX_GPIO_13); 308 } else { 309 wm->pen_is_down = 0; 310 wm97xx_reg_write(wm, AC97_GPIO_POLARITY, pol | 311 WM97XX_GPIO_13); 312 } 313 314 if (wm->id == WM9712_ID2 && wm->variant != WM97xx_WM1613) 315 wm97xx_reg_write(wm, AC97_GPIO_STATUS, (status & 316 ~WM97XX_GPIO_13) << 1); 317 else 318 wm97xx_reg_write(wm, AC97_GPIO_STATUS, status & 319 ~WM97XX_GPIO_13); 320 } 321 322 /* If the system is not using continuous mode or it provides a 323 * pen down operation then we need to schedule polls while the 324 * pen is down. Otherwise the machine driver is responsible 325 * for scheduling reads. 326 */ 327 if (!wm->mach_ops->acc_enabled || wm->mach_ops->acc_pen_down) { 328 if (wm->pen_is_down && !pen_was_down) { 329 /* Data is not available immediately on pen down */ 330 queue_delayed_work(wm->ts_workq, &wm->ts_reader, 1); 331 } 332 333 /* Let ts_reader report the pen up for debounce. */ 334 if (!wm->pen_is_down && pen_was_down) 335 wm->pen_is_down = 1; 336 } 337 338 if (!wm->pen_is_down && wm->mach_ops->acc_enabled) 339 wm->mach_ops->acc_pen_up(wm); 340 341 return IRQ_HANDLED; 342 } 343 344 /* 345 * initialise pen IRQ handler and workqueue 346 */ 347 static int wm97xx_init_pen_irq(struct wm97xx *wm) 348 { 349 u16 reg; 350 351 if (request_threaded_irq(wm->pen_irq, NULL, wm97xx_pen_interrupt, 352 IRQF_SHARED | IRQF_ONESHOT, 353 "wm97xx-pen", wm)) { 354 dev_err(wm->dev, 355 "Failed to register pen down interrupt, polling"); 356 wm->pen_irq = 0; 357 return -EINVAL; 358 } 359 360 /* Configure GPIO as interrupt source on WM971x */ 361 if (wm->id != WM9705_ID2) { 362 BUG_ON(!wm->mach_ops->irq_gpio); 363 reg = wm97xx_reg_read(wm, AC97_MISC_AFE); 364 wm97xx_reg_write(wm, AC97_MISC_AFE, 365 reg & ~(wm->mach_ops->irq_gpio)); 366 reg = wm97xx_reg_read(wm, 0x5a); 367 wm97xx_reg_write(wm, 0x5a, reg & ~0x0001); 368 } 369 370 return 0; 371 } 372 373 static int wm97xx_read_samples(struct wm97xx *wm) 374 { 375 struct wm97xx_data data; 376 int rc; 377 378 guard(mutex)(&wm->codec_mutex); 379 380 if (wm->mach_ops && wm->mach_ops->acc_enabled) 381 rc = wm->mach_ops->acc_pen_down(wm); 382 else 383 rc = wm->codec->poll_touch(wm, &data); 384 385 if (rc & RC_PENUP) { 386 if (wm->pen_is_down) { 387 wm->pen_is_down = 0; 388 dev_dbg(wm->dev, "pen up\n"); 389 input_report_abs(wm->input_dev, ABS_PRESSURE, 0); 390 input_report_key(wm->input_dev, BTN_TOUCH, 0); 391 input_sync(wm->input_dev); 392 } else if (!(rc & RC_AGAIN)) { 393 /* We need high frequency updates only while 394 * pen is down, the user never will be able to 395 * touch screen faster than a few times per 396 * second... On the other hand, when the user 397 * is actively working with the touchscreen we 398 * don't want to lose the quick response. So we 399 * will slowly increase sleep time after the 400 * pen is up and quickly restore it to ~one task 401 * switch when pen is down again. 402 */ 403 if (wm->ts_reader_interval < HZ / 10) 404 wm->ts_reader_interval++; 405 } 406 407 } else if (rc & RC_VALID) { 408 dev_dbg(wm->dev, 409 "pen down: x=%x:%d, y=%x:%d, pressure=%x:%d\n", 410 data.x >> 12, data.x & 0xfff, data.y >> 12, 411 data.y & 0xfff, data.p >> 12, data.p & 0xfff); 412 413 if (abs_x[0] > (data.x & 0xfff) || 414 abs_x[1] < (data.x & 0xfff) || 415 abs_y[0] > (data.y & 0xfff) || 416 abs_y[1] < (data.y & 0xfff)) { 417 dev_dbg(wm->dev, "Measurement out of range, dropping it\n"); 418 return RC_AGAIN; 419 } 420 421 input_report_abs(wm->input_dev, ABS_X, data.x & 0xfff); 422 input_report_abs(wm->input_dev, ABS_Y, data.y & 0xfff); 423 input_report_abs(wm->input_dev, ABS_PRESSURE, data.p & 0xfff); 424 input_report_key(wm->input_dev, BTN_TOUCH, 1); 425 input_sync(wm->input_dev); 426 wm->pen_is_down = 1; 427 wm->ts_reader_interval = wm->ts_reader_min_interval; 428 } else if (rc & RC_PENDOWN) { 429 dev_dbg(wm->dev, "pen down\n"); 430 wm->pen_is_down = 1; 431 wm->ts_reader_interval = wm->ts_reader_min_interval; 432 } 433 434 return rc; 435 } 436 437 /* 438 * The touchscreen sample reader. 439 */ 440 static void wm97xx_ts_reader(struct work_struct *work) 441 { 442 int rc; 443 struct wm97xx *wm = container_of(work, struct wm97xx, ts_reader.work); 444 445 BUG_ON(!wm->codec); 446 447 do { 448 rc = wm97xx_read_samples(wm); 449 } while (rc & RC_AGAIN); 450 451 if (wm->pen_is_down || !wm->pen_irq) 452 queue_delayed_work(wm->ts_workq, &wm->ts_reader, 453 wm->ts_reader_interval); 454 } 455 456 /** 457 * wm97xx_ts_input_open - Open the touch screen input device. 458 * @idev: Input device to be opened. 459 * 460 * Called by the input sub system to open a wm97xx touchscreen device. 461 * Starts the touchscreen thread and touch digitiser. 462 */ 463 static int wm97xx_ts_input_open(struct input_dev *idev) 464 { 465 struct wm97xx *wm = input_get_drvdata(idev); 466 467 wm->ts_workq = alloc_ordered_workqueue("kwm97xx", 0); 468 if (wm->ts_workq == NULL) { 469 dev_err(wm->dev, 470 "Failed to create workqueue\n"); 471 return -EINVAL; 472 } 473 474 /* start digitiser */ 475 if (wm->mach_ops && wm->mach_ops->acc_enabled) 476 wm->codec->acc_enable(wm, 1); 477 wm->codec->dig_enable(wm, 1); 478 479 INIT_DELAYED_WORK(&wm->ts_reader, wm97xx_ts_reader); 480 481 wm->ts_reader_min_interval = HZ >= 100 ? HZ / 100 : 1; 482 if (wm->ts_reader_min_interval < 1) 483 wm->ts_reader_min_interval = 1; 484 wm->ts_reader_interval = wm->ts_reader_min_interval; 485 486 wm->pen_is_down = 0; 487 if (wm->pen_irq) 488 wm97xx_init_pen_irq(wm); 489 else 490 dev_err(wm->dev, "No IRQ specified\n"); 491 492 /* If we either don't have an interrupt for pen down events or 493 * failed to acquire it then we need to poll. 494 */ 495 if (wm->pen_irq == 0) 496 queue_delayed_work(wm->ts_workq, &wm->ts_reader, 497 wm->ts_reader_interval); 498 499 return 0; 500 } 501 502 /** 503 * wm97xx_ts_input_close - Close the touch screen input device. 504 * @idev: Input device to be closed. 505 * 506 * Called by the input sub system to close a wm97xx touchscreen 507 * device. Kills the touchscreen thread and stops the touch 508 * digitiser. 509 */ 510 511 static void wm97xx_ts_input_close(struct input_dev *idev) 512 { 513 struct wm97xx *wm = input_get_drvdata(idev); 514 u16 reg; 515 516 if (wm->pen_irq) { 517 /* Return the interrupt to GPIO usage (disabling it) */ 518 if (wm->id != WM9705_ID2) { 519 BUG_ON(!wm->mach_ops->irq_gpio); 520 reg = wm97xx_reg_read(wm, AC97_MISC_AFE); 521 wm97xx_reg_write(wm, AC97_MISC_AFE, 522 reg | wm->mach_ops->irq_gpio); 523 } 524 525 free_irq(wm->pen_irq, wm); 526 } 527 528 wm->pen_is_down = 0; 529 530 /* ts_reader rearms itself so we need to explicitly stop it 531 * before we destroy the workqueue. 532 */ 533 cancel_delayed_work_sync(&wm->ts_reader); 534 535 destroy_workqueue(wm->ts_workq); 536 537 /* stop digitiser */ 538 wm->codec->dig_enable(wm, 0); 539 if (wm->mach_ops && wm->mach_ops->acc_enabled) 540 wm->codec->acc_enable(wm, 0); 541 } 542 543 static int wm97xx_register_touch(struct wm97xx *wm) 544 { 545 struct wm97xx_pdata *pdata = dev_get_platdata(wm->dev); 546 int ret; 547 548 wm->input_dev = devm_input_allocate_device(wm->dev); 549 if (wm->input_dev == NULL) 550 return -ENOMEM; 551 552 /* set up touch configuration */ 553 wm->input_dev->name = "wm97xx touchscreen"; 554 wm->input_dev->phys = "wm97xx"; 555 wm->input_dev->open = wm97xx_ts_input_open; 556 wm->input_dev->close = wm97xx_ts_input_close; 557 558 __set_bit(EV_ABS, wm->input_dev->evbit); 559 __set_bit(EV_KEY, wm->input_dev->evbit); 560 __set_bit(BTN_TOUCH, wm->input_dev->keybit); 561 562 input_set_abs_params(wm->input_dev, ABS_X, abs_x[0], abs_x[1], 563 abs_x[2], 0); 564 input_set_abs_params(wm->input_dev, ABS_Y, abs_y[0], abs_y[1], 565 abs_y[2], 0); 566 input_set_abs_params(wm->input_dev, ABS_PRESSURE, abs_p[0], abs_p[1], 567 abs_p[2], 0); 568 569 input_set_drvdata(wm->input_dev, wm); 570 wm->input_dev->dev.parent = wm->dev; 571 572 ret = input_register_device(wm->input_dev); 573 if (ret) 574 return ret; 575 576 /* 577 * register our extended touch device (for machine specific 578 * extensions) 579 */ 580 wm->touch_dev = platform_device_alloc("wm97xx-touch", -1); 581 if (!wm->touch_dev) 582 return -ENOMEM; 583 584 platform_set_drvdata(wm->touch_dev, wm); 585 wm->touch_dev->dev.parent = wm->dev; 586 wm->touch_dev->dev.platform_data = pdata; 587 ret = platform_device_add(wm->touch_dev); 588 if (ret < 0) 589 goto touch_reg_err; 590 591 return 0; 592 touch_reg_err: 593 platform_device_put(wm->touch_dev); 594 595 return ret; 596 } 597 598 static void wm97xx_unregister_touch(struct wm97xx *wm) 599 { 600 platform_device_unregister(wm->touch_dev); 601 } 602 603 static int _wm97xx_probe(struct wm97xx *wm) 604 { 605 int id = 0; 606 607 mutex_init(&wm->codec_mutex); 608 dev_set_drvdata(wm->dev, wm); 609 610 /* check that we have a supported codec */ 611 id = wm97xx_reg_read(wm, AC97_VENDOR_ID1); 612 if (id != WM97XX_ID1) { 613 dev_err(wm->dev, 614 "Device with vendor %04x is not a wm97xx\n", id); 615 return -ENODEV; 616 } 617 618 wm->id = wm97xx_reg_read(wm, AC97_VENDOR_ID2); 619 620 wm->variant = WM97xx_GENERIC; 621 622 dev_info(wm->dev, "detected a wm97%02x codec\n", wm->id & 0xff); 623 624 switch (wm->id & 0xff) { 625 #ifdef CONFIG_TOUCHSCREEN_WM9705 626 case 0x05: 627 wm->codec = &wm9705_codec; 628 break; 629 #endif 630 #ifdef CONFIG_TOUCHSCREEN_WM9712 631 case 0x12: 632 wm->codec = &wm9712_codec; 633 break; 634 #endif 635 #ifdef CONFIG_TOUCHSCREEN_WM9713 636 case 0x13: 637 wm->codec = &wm9713_codec; 638 break; 639 #endif 640 default: 641 dev_err(wm->dev, "Support for wm97%02x not compiled in.\n", 642 wm->id & 0xff); 643 return -ENODEV; 644 } 645 646 /* set up physical characteristics */ 647 wm->codec->phy_init(wm); 648 649 /* load gpio cache */ 650 wm->gpio[0] = wm97xx_reg_read(wm, AC97_GPIO_CFG); 651 wm->gpio[1] = wm97xx_reg_read(wm, AC97_GPIO_POLARITY); 652 wm->gpio[2] = wm97xx_reg_read(wm, AC97_GPIO_STICKY); 653 wm->gpio[3] = wm97xx_reg_read(wm, AC97_GPIO_WAKEUP); 654 wm->gpio[4] = wm97xx_reg_read(wm, AC97_GPIO_STATUS); 655 wm->gpio[5] = wm97xx_reg_read(wm, AC97_MISC_AFE); 656 657 return wm97xx_register_touch(wm); 658 } 659 660 static void wm97xx_remove_battery(struct wm97xx *wm) 661 { 662 platform_device_unregister(wm->battery_dev); 663 } 664 665 static int wm97xx_add_battery(struct wm97xx *wm, 666 struct wm97xx_batt_pdata *pdata) 667 { 668 int ret; 669 670 wm->battery_dev = platform_device_alloc("wm97xx-battery", -1); 671 if (!wm->battery_dev) 672 return -ENOMEM; 673 674 platform_set_drvdata(wm->battery_dev, wm); 675 wm->battery_dev->dev.parent = wm->dev; 676 wm->battery_dev->dev.platform_data = pdata; 677 ret = platform_device_add(wm->battery_dev); 678 if (ret) 679 platform_device_put(wm->battery_dev); 680 681 return ret; 682 } 683 684 static int wm97xx_probe(struct device *dev) 685 { 686 struct wm97xx *wm; 687 int ret; 688 struct wm97xx_pdata *pdata = dev_get_platdata(dev); 689 690 wm = devm_kzalloc(dev, sizeof(struct wm97xx), GFP_KERNEL); 691 if (!wm) 692 return -ENOMEM; 693 694 wm->dev = dev; 695 wm->ac97 = to_ac97_t(dev); 696 697 ret = _wm97xx_probe(wm); 698 if (ret) 699 return ret; 700 701 ret = wm97xx_add_battery(wm, pdata ? pdata->batt_pdata : NULL); 702 if (ret < 0) 703 goto batt_err; 704 705 return ret; 706 707 batt_err: 708 wm97xx_unregister_touch(wm); 709 return ret; 710 } 711 712 static int wm97xx_remove(struct device *dev) 713 { 714 struct wm97xx *wm = dev_get_drvdata(dev); 715 716 wm97xx_remove_battery(wm); 717 wm97xx_unregister_touch(wm); 718 719 return 0; 720 } 721 722 static int wm97xx_mfd_probe(struct platform_device *pdev) 723 { 724 struct wm97xx *wm; 725 struct wm97xx_platform_data *mfd_pdata = dev_get_platdata(&pdev->dev); 726 int ret; 727 728 wm = devm_kzalloc(&pdev->dev, sizeof(struct wm97xx), GFP_KERNEL); 729 if (!wm) 730 return -ENOMEM; 731 732 wm->dev = &pdev->dev; 733 wm->ac97 = mfd_pdata->ac97; 734 735 ret = _wm97xx_probe(wm); 736 if (ret) 737 return ret; 738 739 ret = wm97xx_add_battery(wm, mfd_pdata->batt_pdata); 740 if (ret < 0) 741 goto batt_err; 742 743 return ret; 744 745 batt_err: 746 wm97xx_unregister_touch(wm); 747 return ret; 748 } 749 750 static void wm97xx_mfd_remove(struct platform_device *pdev) 751 { 752 wm97xx_remove(&pdev->dev); 753 } 754 755 static int wm97xx_suspend(struct device *dev) 756 { 757 struct wm97xx *wm = dev_get_drvdata(dev); 758 u16 reg; 759 int suspend_mode; 760 761 if (device_may_wakeup(&wm->input_dev->dev)) 762 suspend_mode = wm->suspend_mode; 763 else 764 suspend_mode = 0; 765 766 guard(mutex)(&wm->input_dev->mutex); 767 768 if (input_device_enabled(wm->input_dev)) 769 cancel_delayed_work_sync(&wm->ts_reader); 770 771 /* Power down the digitiser (bypassing the cache for resume) */ 772 reg = wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER2); 773 reg &= ~WM97XX_PRP_DET_DIG; 774 if (input_device_enabled(wm->input_dev)) 775 reg |= suspend_mode; 776 wm->ac97->bus->ops->write(wm->ac97, AC97_WM97XX_DIGITISER2, reg); 777 778 /* WM9713 has an additional power bit - turn it off if there 779 * are no users or if suspend mode is zero. */ 780 if (wm->id == WM9713_ID2 && 781 (!input_device_enabled(wm->input_dev) || !suspend_mode)) { 782 reg = wm97xx_reg_read(wm, AC97_EXTENDED_MID) | 0x8000; 783 wm97xx_reg_write(wm, AC97_EXTENDED_MID, reg); 784 } 785 786 return 0; 787 } 788 789 static int wm97xx_resume(struct device *dev) 790 { 791 struct wm97xx *wm = dev_get_drvdata(dev); 792 793 guard(mutex)(&wm->input_dev->mutex); 794 795 /* restore digitiser and gpios */ 796 if (wm->id == WM9713_ID2) { 797 wm97xx_reg_write(wm, AC97_WM9713_DIG1, wm->dig[0]); 798 wm97xx_reg_write(wm, 0x5a, wm->misc); 799 if (input_device_enabled(wm->input_dev)) { 800 u16 reg; 801 reg = wm97xx_reg_read(wm, AC97_EXTENDED_MID) & 0x7fff; 802 wm97xx_reg_write(wm, AC97_EXTENDED_MID, reg); 803 } 804 } 805 806 wm97xx_reg_write(wm, AC97_WM9713_DIG2, wm->dig[1]); 807 wm97xx_reg_write(wm, AC97_WM9713_DIG3, wm->dig[2]); 808 809 wm97xx_reg_write(wm, AC97_GPIO_CFG, wm->gpio[0]); 810 wm97xx_reg_write(wm, AC97_GPIO_POLARITY, wm->gpio[1]); 811 wm97xx_reg_write(wm, AC97_GPIO_STICKY, wm->gpio[2]); 812 wm97xx_reg_write(wm, AC97_GPIO_WAKEUP, wm->gpio[3]); 813 wm97xx_reg_write(wm, AC97_GPIO_STATUS, wm->gpio[4]); 814 wm97xx_reg_write(wm, AC97_MISC_AFE, wm->gpio[5]); 815 816 if (input_device_enabled(wm->input_dev) && !wm->pen_irq) { 817 wm->ts_reader_interval = wm->ts_reader_min_interval; 818 queue_delayed_work(wm->ts_workq, &wm->ts_reader, 819 wm->ts_reader_interval); 820 } 821 822 return 0; 823 } 824 825 static DEFINE_SIMPLE_DEV_PM_OPS(wm97xx_pm_ops, wm97xx_suspend, wm97xx_resume); 826 827 /* 828 * Machine specific operations 829 */ 830 int wm97xx_register_mach_ops(struct wm97xx *wm, 831 struct wm97xx_mach_ops *mach_ops) 832 { 833 guard(mutex)(&wm->codec_mutex); 834 835 if (wm->mach_ops) 836 return -EINVAL; 837 838 wm->mach_ops = mach_ops; 839 840 return 0; 841 } 842 EXPORT_SYMBOL_GPL(wm97xx_register_mach_ops); 843 844 void wm97xx_unregister_mach_ops(struct wm97xx *wm) 845 { 846 guard(mutex)(&wm->codec_mutex); 847 848 wm->mach_ops = NULL; 849 } 850 EXPORT_SYMBOL_GPL(wm97xx_unregister_mach_ops); 851 852 static struct device_driver wm97xx_driver = { 853 .name = "wm97xx-ts", 854 #ifdef CONFIG_AC97_BUS 855 .bus = &ac97_bus_type, 856 #endif 857 .owner = THIS_MODULE, 858 .probe = wm97xx_probe, 859 .remove = wm97xx_remove, 860 .pm = pm_sleep_ptr(&wm97xx_pm_ops), 861 }; 862 863 static struct platform_driver wm97xx_mfd_driver = { 864 .driver = { 865 .name = "wm97xx-ts", 866 .pm = pm_sleep_ptr(&wm97xx_pm_ops), 867 }, 868 .probe = wm97xx_mfd_probe, 869 .remove = wm97xx_mfd_remove, 870 }; 871 872 static int __init wm97xx_init(void) 873 { 874 int ret; 875 876 ret = platform_driver_register(&wm97xx_mfd_driver); 877 if (ret) 878 return ret; 879 880 if (IS_BUILTIN(CONFIG_AC97_BUS)) 881 ret = driver_register(&wm97xx_driver); 882 return ret; 883 } 884 885 static void __exit wm97xx_exit(void) 886 { 887 if (IS_BUILTIN(CONFIG_AC97_BUS)) 888 driver_unregister(&wm97xx_driver); 889 platform_driver_unregister(&wm97xx_mfd_driver); 890 } 891 892 module_init(wm97xx_init); 893 module_exit(wm97xx_exit); 894 895 /* Module information */ 896 MODULE_AUTHOR("Liam Girdwood <lrg@slimlogic.co.uk>"); 897 MODULE_DESCRIPTION("WM97xx Core - Touch Screen / AUX ADC / GPIO Driver"); 898 MODULE_LICENSE("GPL"); 899