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/workqueue.h> 48 #include <linux/wm97xx.h> 49 #include <linux/uaccess.h> 50 #include <linux/io.h> 51 #include <linux/slab.h> 52 53 #define TS_NAME "wm97xx" 54 #define WM_CORE_VERSION "1.00" 55 #define DEFAULT_PRESSURE 0xb0c0 56 57 58 /* 59 * Touchscreen absolute values 60 * 61 * These parameters are used to help the input layer discard out of 62 * range readings and reduce jitter etc. 63 * 64 * o min, max:- indicate the min and max values your touch screen returns 65 * o fuzz:- use a higher number to reduce jitter 66 * 67 * The default values correspond to Mainstone II in QVGA mode 68 * 69 * Please read 70 * Documentation/input/input-programming.txt for more details. 71 */ 72 73 static int abs_x[3] = {350, 3900, 5}; 74 module_param_array(abs_x, int, NULL, 0); 75 MODULE_PARM_DESC(abs_x, "Touchscreen absolute X min, max, fuzz"); 76 77 static int abs_y[3] = {320, 3750, 40}; 78 module_param_array(abs_y, int, NULL, 0); 79 MODULE_PARM_DESC(abs_y, "Touchscreen absolute Y min, max, fuzz"); 80 81 static int abs_p[3] = {0, 150, 4}; 82 module_param_array(abs_p, int, NULL, 0); 83 MODULE_PARM_DESC(abs_p, "Touchscreen absolute Pressure min, max, fuzz"); 84 85 /* 86 * wm97xx IO access, all IO locking done by AC97 layer 87 */ 88 int wm97xx_reg_read(struct wm97xx *wm, u16 reg) 89 { 90 if (wm->ac97) 91 return wm->ac97->bus->ops->read(wm->ac97, reg); 92 else 93 return -1; 94 } 95 EXPORT_SYMBOL_GPL(wm97xx_reg_read); 96 97 void wm97xx_reg_write(struct wm97xx *wm, u16 reg, u16 val) 98 { 99 /* cache digitiser registers */ 100 if (reg >= AC97_WM9713_DIG1 && reg <= AC97_WM9713_DIG3) 101 wm->dig[(reg - AC97_WM9713_DIG1) >> 1] = val; 102 103 /* cache gpio regs */ 104 if (reg >= AC97_GPIO_CFG && reg <= AC97_MISC_AFE) 105 wm->gpio[(reg - AC97_GPIO_CFG) >> 1] = val; 106 107 /* wm9713 irq reg */ 108 if (reg == 0x5a) 109 wm->misc = val; 110 111 if (wm->ac97) 112 wm->ac97->bus->ops->write(wm->ac97, reg, val); 113 } 114 EXPORT_SYMBOL_GPL(wm97xx_reg_write); 115 116 /** 117 * wm97xx_read_aux_adc - Read the aux adc. 118 * @wm: wm97xx device. 119 * @adcsel: codec ADC to be read 120 * 121 * Reads the selected AUX ADC. 122 */ 123 124 int wm97xx_read_aux_adc(struct wm97xx *wm, u16 adcsel) 125 { 126 int power_adc = 0, auxval; 127 u16 power = 0; 128 129 /* get codec */ 130 mutex_lock(&wm->codec_mutex); 131 132 /* When the touchscreen is not in use, we may have to power up 133 * the AUX ADC before we can use sample the AUX inputs-> 134 */ 135 if (wm->id == WM9713_ID2 && 136 (power = wm97xx_reg_read(wm, AC97_EXTENDED_MID)) & 0x8000) { 137 power_adc = 1; 138 wm97xx_reg_write(wm, AC97_EXTENDED_MID, power & 0x7fff); 139 } 140 141 /* Prepare the codec for AUX reading */ 142 wm->codec->aux_prepare(wm); 143 144 /* Turn polling mode on to read AUX ADC */ 145 wm->pen_probably_down = 1; 146 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 mutex_unlock(&wm->codec_mutex); 156 return auxval & 0xfff; 157 } 158 EXPORT_SYMBOL_GPL(wm97xx_read_aux_adc); 159 160 /** 161 * wm97xx_get_gpio - Get the status of a codec GPIO. 162 * @wm: wm97xx device. 163 * @gpio: gpio 164 * 165 * Get the status of a codec GPIO pin 166 */ 167 168 enum wm97xx_gpio_status wm97xx_get_gpio(struct wm97xx *wm, u32 gpio) 169 { 170 u16 status; 171 enum wm97xx_gpio_status ret; 172 173 mutex_lock(&wm->codec_mutex); 174 status = wm97xx_reg_read(wm, AC97_GPIO_STATUS); 175 176 if (status & gpio) 177 ret = WM97XX_GPIO_HIGH; 178 else 179 ret = WM97XX_GPIO_LOW; 180 181 mutex_unlock(&wm->codec_mutex); 182 return ret; 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 * 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 mutex_lock(&wm->codec_mutex); 201 reg = wm97xx_reg_read(wm, AC97_GPIO_STATUS); 202 203 if (status == WM97XX_GPIO_HIGH) 204 reg |= gpio; 205 else 206 reg &= ~gpio; 207 208 if (wm->id == WM9712_ID2 && wm->variant != WM97xx_WM1613) 209 wm97xx_reg_write(wm, AC97_GPIO_STATUS, reg << 1); 210 else 211 wm97xx_reg_write(wm, AC97_GPIO_STATUS, reg); 212 mutex_unlock(&wm->codec_mutex); 213 } 214 EXPORT_SYMBOL_GPL(wm97xx_set_gpio); 215 216 /* 217 * Codec GPIO pin configuration, this sets pin direction, polarity, 218 * stickyness 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 mutex_lock(&wm->codec_mutex); 227 reg = wm97xx_reg_read(wm, AC97_GPIO_POLARITY); 228 229 if (pol == WM97XX_GPIO_POL_HIGH) 230 reg |= gpio; 231 else 232 reg &= ~gpio; 233 234 wm97xx_reg_write(wm, AC97_GPIO_POLARITY, reg); 235 reg = wm97xx_reg_read(wm, AC97_GPIO_STICKY); 236 237 if (sticky == WM97XX_GPIO_STICKY) 238 reg |= gpio; 239 else 240 reg &= ~gpio; 241 242 wm97xx_reg_write(wm, AC97_GPIO_STICKY, reg); 243 reg = wm97xx_reg_read(wm, AC97_GPIO_WAKEUP); 244 245 if (wake == WM97XX_GPIO_WAKE) 246 reg |= gpio; 247 else 248 reg &= ~gpio; 249 250 wm97xx_reg_write(wm, AC97_GPIO_WAKEUP, reg); 251 reg = wm97xx_reg_read(wm, AC97_GPIO_CFG); 252 253 if (dir == WM97XX_GPIO_IN) 254 reg |= gpio; 255 else 256 reg &= ~gpio; 257 258 wm97xx_reg_write(wm, AC97_GPIO_CFG, reg); 259 mutex_unlock(&wm->codec_mutex); 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 * Handle a pen down interrupt. 282 */ 283 static void wm97xx_pen_irq_worker(struct work_struct *work) 284 { 285 struct wm97xx *wm = container_of(work, struct wm97xx, pen_event_work); 286 int pen_was_down = wm->pen_is_down; 287 288 /* do we need to enable the touch panel reader */ 289 if (wm->id == WM9705_ID2) { 290 if (wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER_RD) & 291 WM97XX_PEN_DOWN) 292 wm->pen_is_down = 1; 293 else 294 wm->pen_is_down = 0; 295 } else { 296 u16 status, pol; 297 mutex_lock(&wm->codec_mutex); 298 status = wm97xx_reg_read(wm, AC97_GPIO_STATUS); 299 pol = wm97xx_reg_read(wm, AC97_GPIO_POLARITY); 300 301 if (WM97XX_GPIO_13 & pol & status) { 302 wm->pen_is_down = 1; 303 wm97xx_reg_write(wm, AC97_GPIO_POLARITY, pol & 304 ~WM97XX_GPIO_13); 305 } else { 306 wm->pen_is_down = 0; 307 wm97xx_reg_write(wm, AC97_GPIO_POLARITY, pol | 308 WM97XX_GPIO_13); 309 } 310 311 if (wm->id == WM9712_ID2 && wm->variant != WM97xx_WM1613) 312 wm97xx_reg_write(wm, AC97_GPIO_STATUS, (status & 313 ~WM97XX_GPIO_13) << 1); 314 else 315 wm97xx_reg_write(wm, AC97_GPIO_STATUS, status & 316 ~WM97XX_GPIO_13); 317 mutex_unlock(&wm->codec_mutex); 318 } 319 320 /* If the system is not using continuous mode or it provides a 321 * pen down operation then we need to schedule polls while the 322 * pen is down. Otherwise the machine driver is responsible 323 * for scheduling reads. 324 */ 325 if (!wm->mach_ops->acc_enabled || wm->mach_ops->acc_pen_down) { 326 if (wm->pen_is_down && !pen_was_down) { 327 /* Data is not availiable immediately on pen down */ 328 queue_delayed_work(wm->ts_workq, &wm->ts_reader, 1); 329 } 330 331 /* Let ts_reader report the pen up for debounce. */ 332 if (!wm->pen_is_down && pen_was_down) 333 wm->pen_is_down = 1; 334 } 335 336 if (!wm->pen_is_down && wm->mach_ops->acc_enabled) 337 wm->mach_ops->acc_pen_up(wm); 338 339 wm->mach_ops->irq_enable(wm, 1); 340 } 341 342 /* 343 * Codec PENDOWN irq handler 344 * 345 * We have to disable the codec interrupt in the handler because it 346 * can take upto 1ms to clear the interrupt source. We schedule a task 347 * in a work queue to do the actual interaction with the chip. The 348 * interrupt is then enabled again in the slow handler when the source 349 * has been cleared. 350 */ 351 static irqreturn_t wm97xx_pen_interrupt(int irq, void *dev_id) 352 { 353 struct wm97xx *wm = dev_id; 354 355 if (!work_pending(&wm->pen_event_work)) { 356 wm->mach_ops->irq_enable(wm, 0); 357 queue_work(wm->ts_workq, &wm->pen_event_work); 358 } 359 360 return IRQ_HANDLED; 361 } 362 363 /* 364 * initialise pen IRQ handler and workqueue 365 */ 366 static int wm97xx_init_pen_irq(struct wm97xx *wm) 367 { 368 u16 reg; 369 370 /* If an interrupt is supplied an IRQ enable operation must also be 371 * provided. */ 372 BUG_ON(!wm->mach_ops->irq_enable); 373 374 if (request_irq(wm->pen_irq, wm97xx_pen_interrupt, IRQF_SHARED, 375 "wm97xx-pen", wm)) { 376 dev_err(wm->dev, 377 "Failed to register pen down interrupt, polling"); 378 wm->pen_irq = 0; 379 return -EINVAL; 380 } 381 382 /* Configure GPIO as interrupt source on WM971x */ 383 if (wm->id != WM9705_ID2) { 384 BUG_ON(!wm->mach_ops->irq_gpio); 385 reg = wm97xx_reg_read(wm, AC97_MISC_AFE); 386 wm97xx_reg_write(wm, AC97_MISC_AFE, 387 reg & ~(wm->mach_ops->irq_gpio)); 388 reg = wm97xx_reg_read(wm, 0x5a); 389 wm97xx_reg_write(wm, 0x5a, reg & ~0x0001); 390 } 391 392 return 0; 393 } 394 395 static int wm97xx_read_samples(struct wm97xx *wm) 396 { 397 struct wm97xx_data data; 398 int rc; 399 400 mutex_lock(&wm->codec_mutex); 401 402 if (wm->mach_ops && wm->mach_ops->acc_enabled) 403 rc = wm->mach_ops->acc_pen_down(wm); 404 else 405 rc = wm->codec->poll_touch(wm, &data); 406 407 if (rc & RC_PENUP) { 408 if (wm->pen_is_down) { 409 wm->pen_is_down = 0; 410 dev_dbg(wm->dev, "pen up\n"); 411 input_report_abs(wm->input_dev, ABS_PRESSURE, 0); 412 input_report_key(wm->input_dev, BTN_TOUCH, 0); 413 input_sync(wm->input_dev); 414 } else if (!(rc & RC_AGAIN)) { 415 /* We need high frequency updates only while 416 * pen is down, the user never will be able to 417 * touch screen faster than a few times per 418 * second... On the other hand, when the user 419 * is actively working with the touchscreen we 420 * don't want to lose the quick response. So we 421 * will slowly increase sleep time after the 422 * pen is up and quicky restore it to ~one task 423 * switch when pen is down again. 424 */ 425 if (wm->ts_reader_interval < HZ / 10) 426 wm->ts_reader_interval++; 427 } 428 429 } else if (rc & RC_VALID) { 430 dev_dbg(wm->dev, 431 "pen down: x=%x:%d, y=%x:%d, pressure=%x:%d\n", 432 data.x >> 12, data.x & 0xfff, data.y >> 12, 433 data.y & 0xfff, data.p >> 12, data.p & 0xfff); 434 input_report_abs(wm->input_dev, ABS_X, data.x & 0xfff); 435 input_report_abs(wm->input_dev, ABS_Y, data.y & 0xfff); 436 input_report_abs(wm->input_dev, ABS_PRESSURE, data.p & 0xfff); 437 input_report_key(wm->input_dev, BTN_TOUCH, 1); 438 input_sync(wm->input_dev); 439 wm->pen_is_down = 1; 440 wm->ts_reader_interval = wm->ts_reader_min_interval; 441 } else if (rc & RC_PENDOWN) { 442 dev_dbg(wm->dev, "pen down\n"); 443 wm->pen_is_down = 1; 444 wm->ts_reader_interval = wm->ts_reader_min_interval; 445 } 446 447 mutex_unlock(&wm->codec_mutex); 448 return rc; 449 } 450 451 /* 452 * The touchscreen sample reader. 453 */ 454 static void wm97xx_ts_reader(struct work_struct *work) 455 { 456 int rc; 457 struct wm97xx *wm = container_of(work, struct wm97xx, ts_reader.work); 458 459 BUG_ON(!wm->codec); 460 461 do { 462 rc = wm97xx_read_samples(wm); 463 } while (rc & RC_AGAIN); 464 465 if (wm->pen_is_down || !wm->pen_irq) 466 queue_delayed_work(wm->ts_workq, &wm->ts_reader, 467 wm->ts_reader_interval); 468 } 469 470 /** 471 * wm97xx_ts_input_open - Open the touch screen input device. 472 * @idev: Input device to be opened. 473 * 474 * Called by the input sub system to open a wm97xx touchscreen device. 475 * Starts the touchscreen thread and touch digitiser. 476 */ 477 static int wm97xx_ts_input_open(struct input_dev *idev) 478 { 479 struct wm97xx *wm = input_get_drvdata(idev); 480 481 wm->ts_workq = create_singlethread_workqueue("kwm97xx"); 482 if (wm->ts_workq == NULL) { 483 dev_err(wm->dev, 484 "Failed to create workqueue\n"); 485 return -EINVAL; 486 } 487 488 /* start digitiser */ 489 if (wm->mach_ops && wm->mach_ops->acc_enabled) 490 wm->codec->acc_enable(wm, 1); 491 wm->codec->dig_enable(wm, 1); 492 493 INIT_DELAYED_WORK(&wm->ts_reader, wm97xx_ts_reader); 494 INIT_WORK(&wm->pen_event_work, wm97xx_pen_irq_worker); 495 496 wm->ts_reader_min_interval = HZ >= 100 ? HZ / 100 : 1; 497 if (wm->ts_reader_min_interval < 1) 498 wm->ts_reader_min_interval = 1; 499 wm->ts_reader_interval = wm->ts_reader_min_interval; 500 501 wm->pen_is_down = 0; 502 if (wm->pen_irq) 503 wm97xx_init_pen_irq(wm); 504 else 505 dev_err(wm->dev, "No IRQ specified\n"); 506 507 /* If we either don't have an interrupt for pen down events or 508 * failed to acquire it then we need to poll. 509 */ 510 if (wm->pen_irq == 0) 511 queue_delayed_work(wm->ts_workq, &wm->ts_reader, 512 wm->ts_reader_interval); 513 514 return 0; 515 } 516 517 /** 518 * wm97xx_ts_input_close - Close the touch screen input device. 519 * @idev: Input device to be closed. 520 * 521 * Called by the input sub system to close a wm97xx touchscreen 522 * device. Kills the touchscreen thread and stops the touch 523 * digitiser. 524 */ 525 526 static void wm97xx_ts_input_close(struct input_dev *idev) 527 { 528 struct wm97xx *wm = input_get_drvdata(idev); 529 u16 reg; 530 531 if (wm->pen_irq) { 532 /* Return the interrupt to GPIO usage (disabling it) */ 533 if (wm->id != WM9705_ID2) { 534 BUG_ON(!wm->mach_ops->irq_gpio); 535 reg = wm97xx_reg_read(wm, AC97_MISC_AFE); 536 wm97xx_reg_write(wm, AC97_MISC_AFE, 537 reg | wm->mach_ops->irq_gpio); 538 } 539 540 free_irq(wm->pen_irq, wm); 541 } 542 543 wm->pen_is_down = 0; 544 545 /* Balance out interrupt disables/enables */ 546 if (cancel_work_sync(&wm->pen_event_work)) 547 wm->mach_ops->irq_enable(wm, 1); 548 549 /* ts_reader rearms itself so we need to explicitly stop it 550 * before we destroy the workqueue. 551 */ 552 cancel_delayed_work_sync(&wm->ts_reader); 553 554 destroy_workqueue(wm->ts_workq); 555 556 /* stop digitiser */ 557 wm->codec->dig_enable(wm, 0); 558 if (wm->mach_ops && wm->mach_ops->acc_enabled) 559 wm->codec->acc_enable(wm, 0); 560 } 561 562 static int wm97xx_probe(struct device *dev) 563 { 564 struct wm97xx *wm; 565 struct wm97xx_pdata *pdata = dev->platform_data; 566 int ret = 0, id = 0; 567 568 wm = kzalloc(sizeof(struct wm97xx), GFP_KERNEL); 569 if (!wm) 570 return -ENOMEM; 571 mutex_init(&wm->codec_mutex); 572 573 wm->dev = dev; 574 dev_set_drvdata(dev, wm); 575 wm->ac97 = to_ac97_t(dev); 576 577 /* check that we have a supported codec */ 578 id = wm97xx_reg_read(wm, AC97_VENDOR_ID1); 579 if (id != WM97XX_ID1) { 580 dev_err(dev, "Device with vendor %04x is not a wm97xx\n", id); 581 ret = -ENODEV; 582 goto alloc_err; 583 } 584 585 wm->id = wm97xx_reg_read(wm, AC97_VENDOR_ID2); 586 587 wm->variant = WM97xx_GENERIC; 588 589 dev_info(wm->dev, "detected a wm97%02x codec\n", wm->id & 0xff); 590 591 switch (wm->id & 0xff) { 592 #ifdef CONFIG_TOUCHSCREEN_WM9705 593 case 0x05: 594 wm->codec = &wm9705_codec; 595 break; 596 #endif 597 #ifdef CONFIG_TOUCHSCREEN_WM9712 598 case 0x12: 599 wm->codec = &wm9712_codec; 600 break; 601 #endif 602 #ifdef CONFIG_TOUCHSCREEN_WM9713 603 case 0x13: 604 wm->codec = &wm9713_codec; 605 break; 606 #endif 607 default: 608 dev_err(wm->dev, "Support for wm97%02x not compiled in.\n", 609 wm->id & 0xff); 610 ret = -ENODEV; 611 goto alloc_err; 612 } 613 614 /* set up physical characteristics */ 615 wm->codec->phy_init(wm); 616 617 /* load gpio cache */ 618 wm->gpio[0] = wm97xx_reg_read(wm, AC97_GPIO_CFG); 619 wm->gpio[1] = wm97xx_reg_read(wm, AC97_GPIO_POLARITY); 620 wm->gpio[2] = wm97xx_reg_read(wm, AC97_GPIO_STICKY); 621 wm->gpio[3] = wm97xx_reg_read(wm, AC97_GPIO_WAKEUP); 622 wm->gpio[4] = wm97xx_reg_read(wm, AC97_GPIO_STATUS); 623 wm->gpio[5] = wm97xx_reg_read(wm, AC97_MISC_AFE); 624 625 wm->input_dev = input_allocate_device(); 626 if (wm->input_dev == NULL) { 627 ret = -ENOMEM; 628 goto alloc_err; 629 } 630 631 /* set up touch configuration */ 632 wm->input_dev->name = "wm97xx touchscreen"; 633 wm->input_dev->phys = "wm97xx"; 634 wm->input_dev->open = wm97xx_ts_input_open; 635 wm->input_dev->close = wm97xx_ts_input_close; 636 637 __set_bit(EV_ABS, wm->input_dev->evbit); 638 __set_bit(EV_KEY, wm->input_dev->evbit); 639 __set_bit(BTN_TOUCH, wm->input_dev->keybit); 640 641 input_set_abs_params(wm->input_dev, ABS_X, abs_x[0], abs_x[1], 642 abs_x[2], 0); 643 input_set_abs_params(wm->input_dev, ABS_Y, abs_y[0], abs_y[1], 644 abs_y[2], 0); 645 input_set_abs_params(wm->input_dev, ABS_PRESSURE, abs_p[0], abs_p[1], 646 abs_p[2], 0); 647 648 input_set_drvdata(wm->input_dev, wm); 649 wm->input_dev->dev.parent = dev; 650 651 ret = input_register_device(wm->input_dev); 652 if (ret < 0) 653 goto dev_alloc_err; 654 655 /* register our battery device */ 656 wm->battery_dev = platform_device_alloc("wm97xx-battery", -1); 657 if (!wm->battery_dev) { 658 ret = -ENOMEM; 659 goto batt_err; 660 } 661 platform_set_drvdata(wm->battery_dev, wm); 662 wm->battery_dev->dev.parent = dev; 663 wm->battery_dev->dev.platform_data = pdata; 664 ret = platform_device_add(wm->battery_dev); 665 if (ret < 0) 666 goto batt_reg_err; 667 668 /* register our extended touch device (for machine specific 669 * extensions) */ 670 wm->touch_dev = platform_device_alloc("wm97xx-touch", -1); 671 if (!wm->touch_dev) { 672 ret = -ENOMEM; 673 goto touch_err; 674 } 675 platform_set_drvdata(wm->touch_dev, wm); 676 wm->touch_dev->dev.parent = dev; 677 wm->touch_dev->dev.platform_data = pdata; 678 ret = platform_device_add(wm->touch_dev); 679 if (ret < 0) 680 goto touch_reg_err; 681 682 return ret; 683 684 touch_reg_err: 685 platform_device_put(wm->touch_dev); 686 touch_err: 687 platform_device_del(wm->battery_dev); 688 batt_reg_err: 689 platform_device_put(wm->battery_dev); 690 batt_err: 691 input_unregister_device(wm->input_dev); 692 wm->input_dev = NULL; 693 dev_alloc_err: 694 input_free_device(wm->input_dev); 695 alloc_err: 696 kfree(wm); 697 698 return ret; 699 } 700 701 static int wm97xx_remove(struct device *dev) 702 { 703 struct wm97xx *wm = dev_get_drvdata(dev); 704 705 platform_device_unregister(wm->battery_dev); 706 platform_device_unregister(wm->touch_dev); 707 input_unregister_device(wm->input_dev); 708 kfree(wm); 709 710 return 0; 711 } 712 713 #ifdef CONFIG_PM 714 static int wm97xx_suspend(struct device *dev, pm_message_t state) 715 { 716 struct wm97xx *wm = dev_get_drvdata(dev); 717 u16 reg; 718 int suspend_mode; 719 720 if (device_may_wakeup(&wm->input_dev->dev)) 721 suspend_mode = wm->suspend_mode; 722 else 723 suspend_mode = 0; 724 725 if (wm->input_dev->users) 726 cancel_delayed_work_sync(&wm->ts_reader); 727 728 /* Power down the digitiser (bypassing the cache for resume) */ 729 reg = wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER2); 730 reg &= ~WM97XX_PRP_DET_DIG; 731 if (wm->input_dev->users) 732 reg |= suspend_mode; 733 wm->ac97->bus->ops->write(wm->ac97, AC97_WM97XX_DIGITISER2, reg); 734 735 /* WM9713 has an additional power bit - turn it off if there 736 * are no users or if suspend mode is zero. */ 737 if (wm->id == WM9713_ID2 && 738 (!wm->input_dev->users || !suspend_mode)) { 739 reg = wm97xx_reg_read(wm, AC97_EXTENDED_MID) | 0x8000; 740 wm97xx_reg_write(wm, AC97_EXTENDED_MID, reg); 741 } 742 743 return 0; 744 } 745 746 static int wm97xx_resume(struct device *dev) 747 { 748 struct wm97xx *wm = dev_get_drvdata(dev); 749 750 /* restore digitiser and gpios */ 751 if (wm->id == WM9713_ID2) { 752 wm97xx_reg_write(wm, AC97_WM9713_DIG1, wm->dig[0]); 753 wm97xx_reg_write(wm, 0x5a, wm->misc); 754 if (wm->input_dev->users) { 755 u16 reg; 756 reg = wm97xx_reg_read(wm, AC97_EXTENDED_MID) & 0x7fff; 757 wm97xx_reg_write(wm, AC97_EXTENDED_MID, reg); 758 } 759 } 760 761 wm97xx_reg_write(wm, AC97_WM9713_DIG2, wm->dig[1]); 762 wm97xx_reg_write(wm, AC97_WM9713_DIG3, wm->dig[2]); 763 764 wm97xx_reg_write(wm, AC97_GPIO_CFG, wm->gpio[0]); 765 wm97xx_reg_write(wm, AC97_GPIO_POLARITY, wm->gpio[1]); 766 wm97xx_reg_write(wm, AC97_GPIO_STICKY, wm->gpio[2]); 767 wm97xx_reg_write(wm, AC97_GPIO_WAKEUP, wm->gpio[3]); 768 wm97xx_reg_write(wm, AC97_GPIO_STATUS, wm->gpio[4]); 769 wm97xx_reg_write(wm, AC97_MISC_AFE, wm->gpio[5]); 770 771 if (wm->input_dev->users && !wm->pen_irq) { 772 wm->ts_reader_interval = wm->ts_reader_min_interval; 773 queue_delayed_work(wm->ts_workq, &wm->ts_reader, 774 wm->ts_reader_interval); 775 } 776 777 return 0; 778 } 779 780 #else 781 #define wm97xx_suspend NULL 782 #define wm97xx_resume NULL 783 #endif 784 785 /* 786 * Machine specific operations 787 */ 788 int wm97xx_register_mach_ops(struct wm97xx *wm, 789 struct wm97xx_mach_ops *mach_ops) 790 { 791 mutex_lock(&wm->codec_mutex); 792 if (wm->mach_ops) { 793 mutex_unlock(&wm->codec_mutex); 794 return -EINVAL; 795 } 796 wm->mach_ops = mach_ops; 797 mutex_unlock(&wm->codec_mutex); 798 799 return 0; 800 } 801 EXPORT_SYMBOL_GPL(wm97xx_register_mach_ops); 802 803 void wm97xx_unregister_mach_ops(struct wm97xx *wm) 804 { 805 mutex_lock(&wm->codec_mutex); 806 wm->mach_ops = NULL; 807 mutex_unlock(&wm->codec_mutex); 808 } 809 EXPORT_SYMBOL_GPL(wm97xx_unregister_mach_ops); 810 811 static struct device_driver wm97xx_driver = { 812 .name = "wm97xx-ts", 813 .bus = &ac97_bus_type, 814 .owner = THIS_MODULE, 815 .probe = wm97xx_probe, 816 .remove = wm97xx_remove, 817 .suspend = wm97xx_suspend, 818 .resume = wm97xx_resume, 819 }; 820 821 static int __init wm97xx_init(void) 822 { 823 return driver_register(&wm97xx_driver); 824 } 825 826 static void __exit wm97xx_exit(void) 827 { 828 driver_unregister(&wm97xx_driver); 829 } 830 831 module_init(wm97xx_init); 832 module_exit(wm97xx_exit); 833 834 /* Module information */ 835 MODULE_AUTHOR("Liam Girdwood <lrg@slimlogic.co.uk>"); 836 MODULE_DESCRIPTION("WM97xx Core - Touch Screen / AUX ADC / GPIO Driver"); 837 MODULE_LICENSE("GPL"); 838