1 /* 2 * wm97xx-core.c -- Touch screen driver core for Wolfson WM9705, WM9712 3 * and WM9713 AC97 Codecs. 4 * 5 * Copyright 2003, 2004, 2005, 2006, 2007, 2008 Wolfson Microelectronics PLC. 6 * Author: Liam Girdwood <lrg@slimlogic.co.uk> 7 * Parts Copyright : Ian Molton <spyro@f2s.com> 8 * Andrew Zabolotny <zap@homelink.ru> 9 * Russell King <rmk@arm.linux.org.uk> 10 * 11 * This program is free software; you can redistribute it and/or modify it 12 * under the terms of the GNU General Public License as published by the 13 * Free Software Foundation; either version 2 of the License, or (at your 14 * option) any later version. 15 * 16 * Notes: 17 * 18 * Features: 19 * - supports WM9705, WM9712, WM9713 20 * - polling mode 21 * - continuous mode (arch-dependent) 22 * - adjustable rpu/dpp settings 23 * - adjustable pressure current 24 * - adjustable sample settle delay 25 * - 4 and 5 wire touchscreens (5 wire is WM9712 only) 26 * - pen down detection 27 * - battery monitor 28 * - sample AUX adcs 29 * - power management 30 * - codec GPIO 31 * - codec event notification 32 * Todo 33 * - Support for async sampling control for noisy LCDs. 34 * 35 */ 36 37 #include <linux/module.h> 38 #include <linux/moduleparam.h> 39 #include <linux/kernel.h> 40 #include <linux/init.h> 41 #include <linux/delay.h> 42 #include <linux/string.h> 43 #include <linux/proc_fs.h> 44 #include <linux/pm.h> 45 #include <linux/interrupt.h> 46 #include <linux/bitops.h> 47 #include <linux/mfd/wm97xx.h> 48 #include <linux/workqueue.h> 49 #include <linux/wm97xx.h> 50 #include <linux/uaccess.h> 51 #include <linux/io.h> 52 #include <linux/slab.h> 53 54 #define TS_NAME "wm97xx" 55 #define WM_CORE_VERSION "1.00" 56 #define DEFAULT_PRESSURE 0xb0c0 57 58 59 /* 60 * Touchscreen absolute values 61 * 62 * These parameters are used to help the input layer discard out of 63 * range readings and reduce jitter etc. 64 * 65 * o min, max:- indicate the min and max values your touch screen returns 66 * o fuzz:- use a higher number to reduce jitter 67 * 68 * The default values correspond to Mainstone II in QVGA mode 69 * 70 * Please read 71 * Documentation/input/input-programming.rst for more details. 72 */ 73 74 static int abs_x[3] = {150, 4000, 5}; 75 module_param_array(abs_x, int, NULL, 0); 76 MODULE_PARM_DESC(abs_x, "Touchscreen absolute X min, max, fuzz"); 77 78 static int abs_y[3] = {200, 4000, 40}; 79 module_param_array(abs_y, int, NULL, 0); 80 MODULE_PARM_DESC(abs_y, "Touchscreen absolute Y min, max, fuzz"); 81 82 static int abs_p[3] = {0, 150, 4}; 83 module_param_array(abs_p, int, NULL, 0); 84 MODULE_PARM_DESC(abs_p, "Touchscreen absolute Pressure min, max, fuzz"); 85 86 /* 87 * wm97xx IO access, all IO locking done by AC97 layer 88 */ 89 int wm97xx_reg_read(struct wm97xx *wm, u16 reg) 90 { 91 if (wm->ac97) 92 return wm->ac97->bus->ops->read(wm->ac97, reg); 93 else 94 return -1; 95 } 96 EXPORT_SYMBOL_GPL(wm97xx_reg_read); 97 98 void wm97xx_reg_write(struct wm97xx *wm, u16 reg, u16 val) 99 { 100 /* cache digitiser registers */ 101 if (reg >= AC97_WM9713_DIG1 && reg <= AC97_WM9713_DIG3) 102 wm->dig[(reg - AC97_WM9713_DIG1) >> 1] = val; 103 104 /* cache gpio regs */ 105 if (reg >= AC97_GPIO_CFG && reg <= AC97_MISC_AFE) 106 wm->gpio[(reg - AC97_GPIO_CFG) >> 1] = val; 107 108 /* wm9713 irq reg */ 109 if (reg == 0x5a) 110 wm->misc = val; 111 112 if (wm->ac97) 113 wm->ac97->bus->ops->write(wm->ac97, reg, val); 114 } 115 EXPORT_SYMBOL_GPL(wm97xx_reg_write); 116 117 /** 118 * wm97xx_read_aux_adc - Read the aux adc. 119 * @wm: wm97xx device. 120 * @adcsel: codec ADC to be read 121 * 122 * Reads the selected AUX ADC. 123 */ 124 125 int wm97xx_read_aux_adc(struct wm97xx *wm, u16 adcsel) 126 { 127 int power_adc = 0, auxval; 128 u16 power = 0; 129 int rc = 0; 130 int timeout = 0; 131 132 /* get codec */ 133 mutex_lock(&wm->codec_mutex); 134 135 /* When the touchscreen is not in use, we may have to power up 136 * the AUX ADC before we can use sample the AUX inputs-> 137 */ 138 if (wm->id == WM9713_ID2 && 139 (power = wm97xx_reg_read(wm, AC97_EXTENDED_MID)) & 0x8000) { 140 power_adc = 1; 141 wm97xx_reg_write(wm, AC97_EXTENDED_MID, power & 0x7fff); 142 } 143 144 /* Prepare the codec for AUX reading */ 145 wm->codec->aux_prepare(wm); 146 147 /* Turn polling mode on to read AUX ADC */ 148 wm->pen_probably_down = 1; 149 150 while (rc != RC_VALID && timeout++ < 5) 151 rc = wm->codec->poll_sample(wm, adcsel, &auxval); 152 153 if (power_adc) 154 wm97xx_reg_write(wm, AC97_EXTENDED_MID, power | 0x8000); 155 156 wm->codec->dig_restore(wm); 157 158 wm->pen_probably_down = 0; 159 160 if (timeout >= 5) { 161 dev_err(wm->dev, 162 "timeout reading auxadc %d, disabling digitiser\n", 163 adcsel); 164 wm->codec->dig_enable(wm, false); 165 } 166 167 mutex_unlock(&wm->codec_mutex); 168 return (rc == RC_VALID ? auxval & 0xfff : -EBUSY); 169 } 170 EXPORT_SYMBOL_GPL(wm97xx_read_aux_adc); 171 172 /** 173 * wm97xx_get_gpio - Get the status of a codec GPIO. 174 * @wm: wm97xx device. 175 * @gpio: gpio 176 * 177 * Get the status of a codec GPIO pin 178 */ 179 180 enum wm97xx_gpio_status wm97xx_get_gpio(struct wm97xx *wm, u32 gpio) 181 { 182 u16 status; 183 enum wm97xx_gpio_status ret; 184 185 mutex_lock(&wm->codec_mutex); 186 status = wm97xx_reg_read(wm, AC97_GPIO_STATUS); 187 188 if (status & gpio) 189 ret = WM97XX_GPIO_HIGH; 190 else 191 ret = WM97XX_GPIO_LOW; 192 193 mutex_unlock(&wm->codec_mutex); 194 return ret; 195 } 196 EXPORT_SYMBOL_GPL(wm97xx_get_gpio); 197 198 /** 199 * wm97xx_set_gpio - Set the status of a codec GPIO. 200 * @wm: wm97xx device. 201 * @gpio: gpio 202 * 203 * 204 * Set the status of a codec GPIO pin 205 */ 206 207 void wm97xx_set_gpio(struct wm97xx *wm, u32 gpio, 208 enum wm97xx_gpio_status status) 209 { 210 u16 reg; 211 212 mutex_lock(&wm->codec_mutex); 213 reg = wm97xx_reg_read(wm, AC97_GPIO_STATUS); 214 215 if (status == WM97XX_GPIO_HIGH) 216 reg |= gpio; 217 else 218 reg &= ~gpio; 219 220 if (wm->id == WM9712_ID2 && wm->variant != WM97xx_WM1613) 221 wm97xx_reg_write(wm, AC97_GPIO_STATUS, reg << 1); 222 else 223 wm97xx_reg_write(wm, AC97_GPIO_STATUS, reg); 224 mutex_unlock(&wm->codec_mutex); 225 } 226 EXPORT_SYMBOL_GPL(wm97xx_set_gpio); 227 228 /* 229 * Codec GPIO pin configuration, this sets pin direction, polarity, 230 * stickyness and wake up. 231 */ 232 void wm97xx_config_gpio(struct wm97xx *wm, u32 gpio, enum wm97xx_gpio_dir dir, 233 enum wm97xx_gpio_pol pol, enum wm97xx_gpio_sticky sticky, 234 enum wm97xx_gpio_wake wake) 235 { 236 u16 reg; 237 238 mutex_lock(&wm->codec_mutex); 239 reg = wm97xx_reg_read(wm, AC97_GPIO_POLARITY); 240 241 if (pol == WM97XX_GPIO_POL_HIGH) 242 reg |= gpio; 243 else 244 reg &= ~gpio; 245 246 wm97xx_reg_write(wm, AC97_GPIO_POLARITY, reg); 247 reg = wm97xx_reg_read(wm, AC97_GPIO_STICKY); 248 249 if (sticky == WM97XX_GPIO_STICKY) 250 reg |= gpio; 251 else 252 reg &= ~gpio; 253 254 wm97xx_reg_write(wm, AC97_GPIO_STICKY, reg); 255 reg = wm97xx_reg_read(wm, AC97_GPIO_WAKEUP); 256 257 if (wake == WM97XX_GPIO_WAKE) 258 reg |= gpio; 259 else 260 reg &= ~gpio; 261 262 wm97xx_reg_write(wm, AC97_GPIO_WAKEUP, reg); 263 reg = wm97xx_reg_read(wm, AC97_GPIO_CFG); 264 265 if (dir == WM97XX_GPIO_IN) 266 reg |= gpio; 267 else 268 reg &= ~gpio; 269 270 wm97xx_reg_write(wm, AC97_GPIO_CFG, reg); 271 mutex_unlock(&wm->codec_mutex); 272 } 273 EXPORT_SYMBOL_GPL(wm97xx_config_gpio); 274 275 /* 276 * Configure the WM97XX_PRP value to use while system is suspended. 277 * If a value other than 0 is set then WM97xx pen detection will be 278 * left enabled in the configured mode while the system is in suspend, 279 * the device has users and suspend has not been disabled via the 280 * wakeup sysfs entries. 281 * 282 * @wm: WM97xx device to configure 283 * @mode: WM97XX_PRP value to configure while suspended 284 */ 285 void wm97xx_set_suspend_mode(struct wm97xx *wm, u16 mode) 286 { 287 wm->suspend_mode = mode; 288 device_init_wakeup(&wm->input_dev->dev, mode != 0); 289 } 290 EXPORT_SYMBOL_GPL(wm97xx_set_suspend_mode); 291 292 /* 293 * Handle a pen down interrupt. 294 */ 295 static void wm97xx_pen_irq_worker(struct work_struct *work) 296 { 297 struct wm97xx *wm = container_of(work, struct wm97xx, pen_event_work); 298 int pen_was_down = wm->pen_is_down; 299 300 /* do we need to enable the touch panel reader */ 301 if (wm->id == WM9705_ID2) { 302 if (wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER_RD) & 303 WM97XX_PEN_DOWN) 304 wm->pen_is_down = 1; 305 else 306 wm->pen_is_down = 0; 307 } else { 308 u16 status, pol; 309 mutex_lock(&wm->codec_mutex); 310 status = wm97xx_reg_read(wm, AC97_GPIO_STATUS); 311 pol = wm97xx_reg_read(wm, AC97_GPIO_POLARITY); 312 313 if (WM97XX_GPIO_13 & pol & status) { 314 wm->pen_is_down = 1; 315 wm97xx_reg_write(wm, AC97_GPIO_POLARITY, pol & 316 ~WM97XX_GPIO_13); 317 } else { 318 wm->pen_is_down = 0; 319 wm97xx_reg_write(wm, AC97_GPIO_POLARITY, pol | 320 WM97XX_GPIO_13); 321 } 322 323 if (wm->id == WM9712_ID2 && wm->variant != WM97xx_WM1613) 324 wm97xx_reg_write(wm, AC97_GPIO_STATUS, (status & 325 ~WM97XX_GPIO_13) << 1); 326 else 327 wm97xx_reg_write(wm, AC97_GPIO_STATUS, status & 328 ~WM97XX_GPIO_13); 329 mutex_unlock(&wm->codec_mutex); 330 } 331 332 /* If the system is not using continuous mode or it provides a 333 * pen down operation then we need to schedule polls while the 334 * pen is down. Otherwise the machine driver is responsible 335 * for scheduling reads. 336 */ 337 if (!wm->mach_ops->acc_enabled || wm->mach_ops->acc_pen_down) { 338 if (wm->pen_is_down && !pen_was_down) { 339 /* Data is not available immediately on pen down */ 340 queue_delayed_work(wm->ts_workq, &wm->ts_reader, 1); 341 } 342 343 /* Let ts_reader report the pen up for debounce. */ 344 if (!wm->pen_is_down && pen_was_down) 345 wm->pen_is_down = 1; 346 } 347 348 if (!wm->pen_is_down && wm->mach_ops->acc_enabled) 349 wm->mach_ops->acc_pen_up(wm); 350 351 wm->mach_ops->irq_enable(wm, 1); 352 } 353 354 /* 355 * Codec PENDOWN irq handler 356 * 357 * We have to disable the codec interrupt in the handler because it 358 * can take up to 1ms to clear the interrupt source. We schedule a task 359 * in a work queue to do the actual interaction with the chip. The 360 * interrupt is then enabled again in the slow handler when the source 361 * has been cleared. 362 */ 363 static irqreturn_t wm97xx_pen_interrupt(int irq, void *dev_id) 364 { 365 struct wm97xx *wm = dev_id; 366 367 if (!work_pending(&wm->pen_event_work)) { 368 wm->mach_ops->irq_enable(wm, 0); 369 queue_work(wm->ts_workq, &wm->pen_event_work); 370 } 371 372 return IRQ_HANDLED; 373 } 374 375 /* 376 * initialise pen IRQ handler and workqueue 377 */ 378 static int wm97xx_init_pen_irq(struct wm97xx *wm) 379 { 380 u16 reg; 381 382 /* If an interrupt is supplied an IRQ enable operation must also be 383 * provided. */ 384 BUG_ON(!wm->mach_ops->irq_enable); 385 386 if (request_irq(wm->pen_irq, wm97xx_pen_interrupt, IRQF_SHARED, 387 "wm97xx-pen", wm)) { 388 dev_err(wm->dev, 389 "Failed to register pen down interrupt, polling"); 390 wm->pen_irq = 0; 391 return -EINVAL; 392 } 393 394 /* Configure GPIO as interrupt source on WM971x */ 395 if (wm->id != WM9705_ID2) { 396 BUG_ON(!wm->mach_ops->irq_gpio); 397 reg = wm97xx_reg_read(wm, AC97_MISC_AFE); 398 wm97xx_reg_write(wm, AC97_MISC_AFE, 399 reg & ~(wm->mach_ops->irq_gpio)); 400 reg = wm97xx_reg_read(wm, 0x5a); 401 wm97xx_reg_write(wm, 0x5a, reg & ~0x0001); 402 } 403 404 return 0; 405 } 406 407 static int wm97xx_read_samples(struct wm97xx *wm) 408 { 409 struct wm97xx_data data; 410 int rc; 411 412 mutex_lock(&wm->codec_mutex); 413 414 if (wm->mach_ops && wm->mach_ops->acc_enabled) 415 rc = wm->mach_ops->acc_pen_down(wm); 416 else 417 rc = wm->codec->poll_touch(wm, &data); 418 419 if (rc & RC_PENUP) { 420 if (wm->pen_is_down) { 421 wm->pen_is_down = 0; 422 dev_dbg(wm->dev, "pen up\n"); 423 input_report_abs(wm->input_dev, ABS_PRESSURE, 0); 424 input_report_key(wm->input_dev, BTN_TOUCH, 0); 425 input_sync(wm->input_dev); 426 } else if (!(rc & RC_AGAIN)) { 427 /* We need high frequency updates only while 428 * pen is down, the user never will be able to 429 * touch screen faster than a few times per 430 * second... On the other hand, when the user 431 * is actively working with the touchscreen we 432 * don't want to lose the quick response. So we 433 * will slowly increase sleep time after the 434 * pen is up and quicky restore it to ~one task 435 * switch when pen is down again. 436 */ 437 if (wm->ts_reader_interval < HZ / 10) 438 wm->ts_reader_interval++; 439 } 440 441 } else if (rc & RC_VALID) { 442 dev_dbg(wm->dev, 443 "pen down: x=%x:%d, y=%x:%d, pressure=%x:%d\n", 444 data.x >> 12, data.x & 0xfff, data.y >> 12, 445 data.y & 0xfff, data.p >> 12, data.p & 0xfff); 446 447 if (abs_x[0] > (data.x & 0xfff) || 448 abs_x[1] < (data.x & 0xfff) || 449 abs_y[0] > (data.y & 0xfff) || 450 abs_y[1] < (data.y & 0xfff)) { 451 dev_dbg(wm->dev, "Measurement out of range, dropping it\n"); 452 rc = RC_AGAIN; 453 goto out; 454 } 455 456 input_report_abs(wm->input_dev, ABS_X, data.x & 0xfff); 457 input_report_abs(wm->input_dev, ABS_Y, data.y & 0xfff); 458 input_report_abs(wm->input_dev, ABS_PRESSURE, data.p & 0xfff); 459 input_report_key(wm->input_dev, BTN_TOUCH, 1); 460 input_sync(wm->input_dev); 461 wm->pen_is_down = 1; 462 wm->ts_reader_interval = wm->ts_reader_min_interval; 463 } else if (rc & RC_PENDOWN) { 464 dev_dbg(wm->dev, "pen down\n"); 465 wm->pen_is_down = 1; 466 wm->ts_reader_interval = wm->ts_reader_min_interval; 467 } 468 469 out: 470 mutex_unlock(&wm->codec_mutex); 471 return rc; 472 } 473 474 /* 475 * The touchscreen sample reader. 476 */ 477 static void wm97xx_ts_reader(struct work_struct *work) 478 { 479 int rc; 480 struct wm97xx *wm = container_of(work, struct wm97xx, ts_reader.work); 481 482 BUG_ON(!wm->codec); 483 484 do { 485 rc = wm97xx_read_samples(wm); 486 } while (rc & RC_AGAIN); 487 488 if (wm->pen_is_down || !wm->pen_irq) 489 queue_delayed_work(wm->ts_workq, &wm->ts_reader, 490 wm->ts_reader_interval); 491 } 492 493 /** 494 * wm97xx_ts_input_open - Open the touch screen input device. 495 * @idev: Input device to be opened. 496 * 497 * Called by the input sub system to open a wm97xx touchscreen device. 498 * Starts the touchscreen thread and touch digitiser. 499 */ 500 static int wm97xx_ts_input_open(struct input_dev *idev) 501 { 502 struct wm97xx *wm = input_get_drvdata(idev); 503 504 wm->ts_workq = alloc_ordered_workqueue("kwm97xx", 0); 505 if (wm->ts_workq == NULL) { 506 dev_err(wm->dev, 507 "Failed to create workqueue\n"); 508 return -EINVAL; 509 } 510 511 /* start digitiser */ 512 if (wm->mach_ops && wm->mach_ops->acc_enabled) 513 wm->codec->acc_enable(wm, 1); 514 wm->codec->dig_enable(wm, 1); 515 516 INIT_DELAYED_WORK(&wm->ts_reader, wm97xx_ts_reader); 517 INIT_WORK(&wm->pen_event_work, wm97xx_pen_irq_worker); 518 519 wm->ts_reader_min_interval = HZ >= 100 ? HZ / 100 : 1; 520 if (wm->ts_reader_min_interval < 1) 521 wm->ts_reader_min_interval = 1; 522 wm->ts_reader_interval = wm->ts_reader_min_interval; 523 524 wm->pen_is_down = 0; 525 if (wm->pen_irq) 526 wm97xx_init_pen_irq(wm); 527 else 528 dev_err(wm->dev, "No IRQ specified\n"); 529 530 /* If we either don't have an interrupt for pen down events or 531 * failed to acquire it then we need to poll. 532 */ 533 if (wm->pen_irq == 0) 534 queue_delayed_work(wm->ts_workq, &wm->ts_reader, 535 wm->ts_reader_interval); 536 537 return 0; 538 } 539 540 /** 541 * wm97xx_ts_input_close - Close the touch screen input device. 542 * @idev: Input device to be closed. 543 * 544 * Called by the input sub system to close a wm97xx touchscreen 545 * device. Kills the touchscreen thread and stops the touch 546 * digitiser. 547 */ 548 549 static void wm97xx_ts_input_close(struct input_dev *idev) 550 { 551 struct wm97xx *wm = input_get_drvdata(idev); 552 u16 reg; 553 554 if (wm->pen_irq) { 555 /* Return the interrupt to GPIO usage (disabling it) */ 556 if (wm->id != WM9705_ID2) { 557 BUG_ON(!wm->mach_ops->irq_gpio); 558 reg = wm97xx_reg_read(wm, AC97_MISC_AFE); 559 wm97xx_reg_write(wm, AC97_MISC_AFE, 560 reg | wm->mach_ops->irq_gpio); 561 } 562 563 free_irq(wm->pen_irq, wm); 564 } 565 566 wm->pen_is_down = 0; 567 568 /* Balance out interrupt disables/enables */ 569 if (cancel_work_sync(&wm->pen_event_work)) 570 wm->mach_ops->irq_enable(wm, 1); 571 572 /* ts_reader rearms itself so we need to explicitly stop it 573 * before we destroy the workqueue. 574 */ 575 cancel_delayed_work_sync(&wm->ts_reader); 576 577 destroy_workqueue(wm->ts_workq); 578 579 /* stop digitiser */ 580 wm->codec->dig_enable(wm, 0); 581 if (wm->mach_ops && wm->mach_ops->acc_enabled) 582 wm->codec->acc_enable(wm, 0); 583 } 584 585 static int wm97xx_register_touch(struct wm97xx *wm) 586 { 587 struct wm97xx_pdata *pdata = dev_get_platdata(wm->dev); 588 int ret; 589 590 wm->input_dev = devm_input_allocate_device(wm->dev); 591 if (wm->input_dev == NULL) 592 return -ENOMEM; 593 594 /* set up touch configuration */ 595 wm->input_dev->name = "wm97xx touchscreen"; 596 wm->input_dev->phys = "wm97xx"; 597 wm->input_dev->open = wm97xx_ts_input_open; 598 wm->input_dev->close = wm97xx_ts_input_close; 599 600 __set_bit(EV_ABS, wm->input_dev->evbit); 601 __set_bit(EV_KEY, wm->input_dev->evbit); 602 __set_bit(BTN_TOUCH, wm->input_dev->keybit); 603 604 input_set_abs_params(wm->input_dev, ABS_X, abs_x[0], abs_x[1], 605 abs_x[2], 0); 606 input_set_abs_params(wm->input_dev, ABS_Y, abs_y[0], abs_y[1], 607 abs_y[2], 0); 608 input_set_abs_params(wm->input_dev, ABS_PRESSURE, abs_p[0], abs_p[1], 609 abs_p[2], 0); 610 611 input_set_drvdata(wm->input_dev, wm); 612 wm->input_dev->dev.parent = wm->dev; 613 614 ret = input_register_device(wm->input_dev); 615 if (ret) 616 return ret; 617 618 /* 619 * register our extended touch device (for machine specific 620 * extensions) 621 */ 622 wm->touch_dev = platform_device_alloc("wm97xx-touch", -1); 623 if (!wm->touch_dev) { 624 ret = -ENOMEM; 625 goto touch_err; 626 } 627 platform_set_drvdata(wm->touch_dev, wm); 628 wm->touch_dev->dev.parent = wm->dev; 629 wm->touch_dev->dev.platform_data = pdata; 630 ret = platform_device_add(wm->touch_dev); 631 if (ret < 0) 632 goto touch_reg_err; 633 634 return 0; 635 touch_reg_err: 636 platform_device_put(wm->touch_dev); 637 touch_err: 638 input_unregister_device(wm->input_dev); 639 wm->input_dev = NULL; 640 641 return ret; 642 } 643 644 static void wm97xx_unregister_touch(struct wm97xx *wm) 645 { 646 platform_device_unregister(wm->touch_dev); 647 input_unregister_device(wm->input_dev); 648 wm->input_dev = NULL; 649 } 650 651 static int _wm97xx_probe(struct wm97xx *wm) 652 { 653 int id = 0; 654 655 mutex_init(&wm->codec_mutex); 656 dev_set_drvdata(wm->dev, wm); 657 658 /* check that we have a supported codec */ 659 id = wm97xx_reg_read(wm, AC97_VENDOR_ID1); 660 if (id != WM97XX_ID1) { 661 dev_err(wm->dev, 662 "Device with vendor %04x is not a wm97xx\n", id); 663 return -ENODEV; 664 } 665 666 wm->id = wm97xx_reg_read(wm, AC97_VENDOR_ID2); 667 668 wm->variant = WM97xx_GENERIC; 669 670 dev_info(wm->dev, "detected a wm97%02x codec\n", wm->id & 0xff); 671 672 switch (wm->id & 0xff) { 673 #ifdef CONFIG_TOUCHSCREEN_WM9705 674 case 0x05: 675 wm->codec = &wm9705_codec; 676 break; 677 #endif 678 #ifdef CONFIG_TOUCHSCREEN_WM9712 679 case 0x12: 680 wm->codec = &wm9712_codec; 681 break; 682 #endif 683 #ifdef CONFIG_TOUCHSCREEN_WM9713 684 case 0x13: 685 wm->codec = &wm9713_codec; 686 break; 687 #endif 688 default: 689 dev_err(wm->dev, "Support for wm97%02x not compiled in.\n", 690 wm->id & 0xff); 691 return -ENODEV; 692 } 693 694 /* set up physical characteristics */ 695 wm->codec->phy_init(wm); 696 697 /* load gpio cache */ 698 wm->gpio[0] = wm97xx_reg_read(wm, AC97_GPIO_CFG); 699 wm->gpio[1] = wm97xx_reg_read(wm, AC97_GPIO_POLARITY); 700 wm->gpio[2] = wm97xx_reg_read(wm, AC97_GPIO_STICKY); 701 wm->gpio[3] = wm97xx_reg_read(wm, AC97_GPIO_WAKEUP); 702 wm->gpio[4] = wm97xx_reg_read(wm, AC97_GPIO_STATUS); 703 wm->gpio[5] = wm97xx_reg_read(wm, AC97_MISC_AFE); 704 705 return wm97xx_register_touch(wm); 706 } 707 708 static void wm97xx_remove_battery(struct wm97xx *wm) 709 { 710 platform_device_unregister(wm->battery_dev); 711 } 712 713 static int wm97xx_add_battery(struct wm97xx *wm, 714 struct wm97xx_batt_pdata *pdata) 715 { 716 int ret; 717 718 wm->battery_dev = platform_device_alloc("wm97xx-battery", -1); 719 if (!wm->battery_dev) 720 return -ENOMEM; 721 722 platform_set_drvdata(wm->battery_dev, wm); 723 wm->battery_dev->dev.parent = wm->dev; 724 wm->battery_dev->dev.platform_data = pdata; 725 ret = platform_device_add(wm->battery_dev); 726 if (ret) 727 platform_device_put(wm->battery_dev); 728 729 return ret; 730 } 731 732 static int wm97xx_probe(struct device *dev) 733 { 734 struct wm97xx *wm; 735 int ret; 736 struct wm97xx_pdata *pdata = dev_get_platdata(dev); 737 738 wm = devm_kzalloc(dev, sizeof(struct wm97xx), GFP_KERNEL); 739 if (!wm) 740 return -ENOMEM; 741 742 wm->dev = dev; 743 wm->ac97 = to_ac97_t(dev); 744 745 ret = _wm97xx_probe(wm); 746 if (ret) 747 return ret; 748 749 ret = wm97xx_add_battery(wm, pdata ? pdata->batt_pdata : NULL); 750 if (ret < 0) 751 goto batt_err; 752 753 return ret; 754 755 batt_err: 756 wm97xx_unregister_touch(wm); 757 return ret; 758 } 759 760 static int wm97xx_remove(struct device *dev) 761 { 762 struct wm97xx *wm = dev_get_drvdata(dev); 763 764 wm97xx_remove_battery(wm); 765 wm97xx_unregister_touch(wm); 766 767 return 0; 768 } 769 770 static int wm97xx_mfd_probe(struct platform_device *pdev) 771 { 772 struct wm97xx *wm; 773 struct wm97xx_platform_data *mfd_pdata = dev_get_platdata(&pdev->dev); 774 int ret; 775 776 wm = devm_kzalloc(&pdev->dev, sizeof(struct wm97xx), GFP_KERNEL); 777 if (!wm) 778 return -ENOMEM; 779 780 wm->dev = &pdev->dev; 781 wm->ac97 = mfd_pdata->ac97; 782 783 ret = _wm97xx_probe(wm); 784 if (ret) 785 return ret; 786 787 ret = wm97xx_add_battery(wm, mfd_pdata->batt_pdata); 788 if (ret < 0) 789 goto batt_err; 790 791 return ret; 792 793 batt_err: 794 wm97xx_unregister_touch(wm); 795 return ret; 796 } 797 798 static int wm97xx_mfd_remove(struct platform_device *pdev) 799 { 800 return wm97xx_remove(&pdev->dev); 801 } 802 803 static int __maybe_unused wm97xx_suspend(struct device *dev) 804 { 805 struct wm97xx *wm = dev_get_drvdata(dev); 806 u16 reg; 807 int suspend_mode; 808 809 if (device_may_wakeup(&wm->input_dev->dev)) 810 suspend_mode = wm->suspend_mode; 811 else 812 suspend_mode = 0; 813 814 if (wm->input_dev->users) 815 cancel_delayed_work_sync(&wm->ts_reader); 816 817 /* Power down the digitiser (bypassing the cache for resume) */ 818 reg = wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER2); 819 reg &= ~WM97XX_PRP_DET_DIG; 820 if (wm->input_dev->users) 821 reg |= suspend_mode; 822 wm->ac97->bus->ops->write(wm->ac97, AC97_WM97XX_DIGITISER2, reg); 823 824 /* WM9713 has an additional power bit - turn it off if there 825 * are no users or if suspend mode is zero. */ 826 if (wm->id == WM9713_ID2 && 827 (!wm->input_dev->users || !suspend_mode)) { 828 reg = wm97xx_reg_read(wm, AC97_EXTENDED_MID) | 0x8000; 829 wm97xx_reg_write(wm, AC97_EXTENDED_MID, reg); 830 } 831 832 return 0; 833 } 834 835 static int __maybe_unused wm97xx_resume(struct device *dev) 836 { 837 struct wm97xx *wm = dev_get_drvdata(dev); 838 839 /* restore digitiser and gpios */ 840 if (wm->id == WM9713_ID2) { 841 wm97xx_reg_write(wm, AC97_WM9713_DIG1, wm->dig[0]); 842 wm97xx_reg_write(wm, 0x5a, wm->misc); 843 if (wm->input_dev->users) { 844 u16 reg; 845 reg = wm97xx_reg_read(wm, AC97_EXTENDED_MID) & 0x7fff; 846 wm97xx_reg_write(wm, AC97_EXTENDED_MID, reg); 847 } 848 } 849 850 wm97xx_reg_write(wm, AC97_WM9713_DIG2, wm->dig[1]); 851 wm97xx_reg_write(wm, AC97_WM9713_DIG3, wm->dig[2]); 852 853 wm97xx_reg_write(wm, AC97_GPIO_CFG, wm->gpio[0]); 854 wm97xx_reg_write(wm, AC97_GPIO_POLARITY, wm->gpio[1]); 855 wm97xx_reg_write(wm, AC97_GPIO_STICKY, wm->gpio[2]); 856 wm97xx_reg_write(wm, AC97_GPIO_WAKEUP, wm->gpio[3]); 857 wm97xx_reg_write(wm, AC97_GPIO_STATUS, wm->gpio[4]); 858 wm97xx_reg_write(wm, AC97_MISC_AFE, wm->gpio[5]); 859 860 if (wm->input_dev->users && !wm->pen_irq) { 861 wm->ts_reader_interval = wm->ts_reader_min_interval; 862 queue_delayed_work(wm->ts_workq, &wm->ts_reader, 863 wm->ts_reader_interval); 864 } 865 866 return 0; 867 } 868 869 static SIMPLE_DEV_PM_OPS(wm97xx_pm_ops, wm97xx_suspend, wm97xx_resume); 870 871 /* 872 * Machine specific operations 873 */ 874 int wm97xx_register_mach_ops(struct wm97xx *wm, 875 struct wm97xx_mach_ops *mach_ops) 876 { 877 mutex_lock(&wm->codec_mutex); 878 if (wm->mach_ops) { 879 mutex_unlock(&wm->codec_mutex); 880 return -EINVAL; 881 } 882 wm->mach_ops = mach_ops; 883 mutex_unlock(&wm->codec_mutex); 884 885 return 0; 886 } 887 EXPORT_SYMBOL_GPL(wm97xx_register_mach_ops); 888 889 void wm97xx_unregister_mach_ops(struct wm97xx *wm) 890 { 891 mutex_lock(&wm->codec_mutex); 892 wm->mach_ops = NULL; 893 mutex_unlock(&wm->codec_mutex); 894 } 895 EXPORT_SYMBOL_GPL(wm97xx_unregister_mach_ops); 896 897 static struct device_driver wm97xx_driver = { 898 .name = "wm97xx-ts", 899 #ifdef CONFIG_AC97_BUS 900 .bus = &ac97_bus_type, 901 #endif 902 .owner = THIS_MODULE, 903 .probe = wm97xx_probe, 904 .remove = wm97xx_remove, 905 .pm = &wm97xx_pm_ops, 906 }; 907 908 static struct platform_driver wm97xx_mfd_driver = { 909 .driver = { 910 .name = "wm97xx-ts", 911 .pm = &wm97xx_pm_ops, 912 }, 913 .probe = wm97xx_mfd_probe, 914 .remove = wm97xx_mfd_remove, 915 }; 916 917 static int __init wm97xx_init(void) 918 { 919 int ret; 920 921 ret = platform_driver_register(&wm97xx_mfd_driver); 922 if (ret) 923 return ret; 924 925 if (IS_BUILTIN(CONFIG_AC97_BUS)) 926 ret = driver_register(&wm97xx_driver); 927 return ret; 928 } 929 930 static void __exit wm97xx_exit(void) 931 { 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