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 * 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 mutex_lock(&wm->input_dev->mutex); 810 if (input_device_enabled(wm->input_dev)) 811 cancel_delayed_work_sync(&wm->ts_reader); 812 813 /* Power down the digitiser (bypassing the cache for resume) */ 814 reg = wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER2); 815 reg &= ~WM97XX_PRP_DET_DIG; 816 if (input_device_enabled(wm->input_dev)) 817 reg |= suspend_mode; 818 wm->ac97->bus->ops->write(wm->ac97, AC97_WM97XX_DIGITISER2, reg); 819 820 /* WM9713 has an additional power bit - turn it off if there 821 * are no users or if suspend mode is zero. */ 822 if (wm->id == WM9713_ID2 && 823 (!input_device_enabled(wm->input_dev) || !suspend_mode)) { 824 reg = wm97xx_reg_read(wm, AC97_EXTENDED_MID) | 0x8000; 825 wm97xx_reg_write(wm, AC97_EXTENDED_MID, reg); 826 } 827 mutex_unlock(&wm->input_dev->mutex); 828 829 return 0; 830 } 831 832 static int __maybe_unused wm97xx_resume(struct device *dev) 833 { 834 struct wm97xx *wm = dev_get_drvdata(dev); 835 836 mutex_lock(&wm->input_dev->mutex); 837 /* restore digitiser and gpios */ 838 if (wm->id == WM9713_ID2) { 839 wm97xx_reg_write(wm, AC97_WM9713_DIG1, wm->dig[0]); 840 wm97xx_reg_write(wm, 0x5a, wm->misc); 841 if (input_device_enabled(wm->input_dev)) { 842 u16 reg; 843 reg = wm97xx_reg_read(wm, AC97_EXTENDED_MID) & 0x7fff; 844 wm97xx_reg_write(wm, AC97_EXTENDED_MID, reg); 845 } 846 } 847 848 wm97xx_reg_write(wm, AC97_WM9713_DIG2, wm->dig[1]); 849 wm97xx_reg_write(wm, AC97_WM9713_DIG3, wm->dig[2]); 850 851 wm97xx_reg_write(wm, AC97_GPIO_CFG, wm->gpio[0]); 852 wm97xx_reg_write(wm, AC97_GPIO_POLARITY, wm->gpio[1]); 853 wm97xx_reg_write(wm, AC97_GPIO_STICKY, wm->gpio[2]); 854 wm97xx_reg_write(wm, AC97_GPIO_WAKEUP, wm->gpio[3]); 855 wm97xx_reg_write(wm, AC97_GPIO_STATUS, wm->gpio[4]); 856 wm97xx_reg_write(wm, AC97_MISC_AFE, wm->gpio[5]); 857 858 if (input_device_enabled(wm->input_dev) && !wm->pen_irq) { 859 wm->ts_reader_interval = wm->ts_reader_min_interval; 860 queue_delayed_work(wm->ts_workq, &wm->ts_reader, 861 wm->ts_reader_interval); 862 } 863 mutex_unlock(&wm->input_dev->mutex); 864 865 return 0; 866 } 867 868 static SIMPLE_DEV_PM_OPS(wm97xx_pm_ops, wm97xx_suspend, wm97xx_resume); 869 870 /* 871 * Machine specific operations 872 */ 873 int wm97xx_register_mach_ops(struct wm97xx *wm, 874 struct wm97xx_mach_ops *mach_ops) 875 { 876 mutex_lock(&wm->codec_mutex); 877 if (wm->mach_ops) { 878 mutex_unlock(&wm->codec_mutex); 879 return -EINVAL; 880 } 881 wm->mach_ops = mach_ops; 882 mutex_unlock(&wm->codec_mutex); 883 884 return 0; 885 } 886 EXPORT_SYMBOL_GPL(wm97xx_register_mach_ops); 887 888 void wm97xx_unregister_mach_ops(struct wm97xx *wm) 889 { 890 mutex_lock(&wm->codec_mutex); 891 wm->mach_ops = NULL; 892 mutex_unlock(&wm->codec_mutex); 893 } 894 EXPORT_SYMBOL_GPL(wm97xx_unregister_mach_ops); 895 896 static struct device_driver wm97xx_driver = { 897 .name = "wm97xx-ts", 898 #ifdef CONFIG_AC97_BUS 899 .bus = &ac97_bus_type, 900 #endif 901 .owner = THIS_MODULE, 902 .probe = wm97xx_probe, 903 .remove = wm97xx_remove, 904 .pm = &wm97xx_pm_ops, 905 }; 906 907 static struct platform_driver wm97xx_mfd_driver = { 908 .driver = { 909 .name = "wm97xx-ts", 910 .pm = &wm97xx_pm_ops, 911 }, 912 .probe = wm97xx_mfd_probe, 913 .remove = wm97xx_mfd_remove, 914 }; 915 916 static int __init wm97xx_init(void) 917 { 918 int ret; 919 920 ret = platform_driver_register(&wm97xx_mfd_driver); 921 if (ret) 922 return ret; 923 924 if (IS_BUILTIN(CONFIG_AC97_BUS)) 925 ret = driver_register(&wm97xx_driver); 926 return ret; 927 } 928 929 static void __exit wm97xx_exit(void) 930 { 931 if (IS_BUILTIN(CONFIG_AC97_BUS)) 932 driver_unregister(&wm97xx_driver); 933 platform_driver_unregister(&wm97xx_mfd_driver); 934 } 935 936 module_init(wm97xx_init); 937 module_exit(wm97xx_exit); 938 939 /* Module information */ 940 MODULE_AUTHOR("Liam Girdwood <lrg@slimlogic.co.uk>"); 941 MODULE_DESCRIPTION("WM97xx Core - Touch Screen / AUX ADC / GPIO Driver"); 942 MODULE_LICENSE("GPL"); 943