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 int rc = 0; 129 int timeout = 0; 130 131 /* get codec */ 132 mutex_lock(&wm->codec_mutex); 133 134 /* When the touchscreen is not in use, we may have to power up 135 * the AUX ADC before we can use sample the AUX inputs-> 136 */ 137 if (wm->id == WM9713_ID2 && 138 (power = wm97xx_reg_read(wm, AC97_EXTENDED_MID)) & 0x8000) { 139 power_adc = 1; 140 wm97xx_reg_write(wm, AC97_EXTENDED_MID, power & 0x7fff); 141 } 142 143 /* Prepare the codec for AUX reading */ 144 wm->codec->aux_prepare(wm); 145 146 /* Turn polling mode on to read AUX ADC */ 147 wm->pen_probably_down = 1; 148 149 while (rc != RC_VALID && timeout++ < 5) 150 rc = wm->codec->poll_sample(wm, adcsel, &auxval); 151 152 if (power_adc) 153 wm97xx_reg_write(wm, AC97_EXTENDED_MID, power | 0x8000); 154 155 wm->codec->dig_restore(wm); 156 157 wm->pen_probably_down = 0; 158 159 if (timeout >= 5) { 160 dev_err(wm->dev, 161 "timeout reading auxadc %d, disabling digitiser\n", 162 adcsel); 163 wm->codec->dig_enable(wm, false); 164 } 165 166 mutex_unlock(&wm->codec_mutex); 167 return (rc == RC_VALID ? auxval & 0xfff : -EBUSY); 168 } 169 EXPORT_SYMBOL_GPL(wm97xx_read_aux_adc); 170 171 /** 172 * wm97xx_get_gpio - Get the status of a codec GPIO. 173 * @wm: wm97xx device. 174 * @gpio: gpio 175 * 176 * Get the status of a codec GPIO pin 177 */ 178 179 enum wm97xx_gpio_status wm97xx_get_gpio(struct wm97xx *wm, u32 gpio) 180 { 181 u16 status; 182 enum wm97xx_gpio_status ret; 183 184 mutex_lock(&wm->codec_mutex); 185 status = wm97xx_reg_read(wm, AC97_GPIO_STATUS); 186 187 if (status & gpio) 188 ret = WM97XX_GPIO_HIGH; 189 else 190 ret = WM97XX_GPIO_LOW; 191 192 mutex_unlock(&wm->codec_mutex); 193 return ret; 194 } 195 EXPORT_SYMBOL_GPL(wm97xx_get_gpio); 196 197 /** 198 * wm97xx_set_gpio - Set the status of a codec GPIO. 199 * @wm: wm97xx device. 200 * @gpio: gpio 201 * 202 * 203 * Set the status of a codec GPIO pin 204 */ 205 206 void wm97xx_set_gpio(struct wm97xx *wm, u32 gpio, 207 enum wm97xx_gpio_status status) 208 { 209 u16 reg; 210 211 mutex_lock(&wm->codec_mutex); 212 reg = wm97xx_reg_read(wm, AC97_GPIO_STATUS); 213 214 if (status == WM97XX_GPIO_HIGH) 215 reg |= gpio; 216 else 217 reg &= ~gpio; 218 219 if (wm->id == WM9712_ID2 && wm->variant != WM97xx_WM1613) 220 wm97xx_reg_write(wm, AC97_GPIO_STATUS, reg << 1); 221 else 222 wm97xx_reg_write(wm, AC97_GPIO_STATUS, reg); 223 mutex_unlock(&wm->codec_mutex); 224 } 225 EXPORT_SYMBOL_GPL(wm97xx_set_gpio); 226 227 /* 228 * Codec GPIO pin configuration, this sets pin direction, polarity, 229 * stickyness and wake up. 230 */ 231 void wm97xx_config_gpio(struct wm97xx *wm, u32 gpio, enum wm97xx_gpio_dir dir, 232 enum wm97xx_gpio_pol pol, enum wm97xx_gpio_sticky sticky, 233 enum wm97xx_gpio_wake wake) 234 { 235 u16 reg; 236 237 mutex_lock(&wm->codec_mutex); 238 reg = wm97xx_reg_read(wm, AC97_GPIO_POLARITY); 239 240 if (pol == WM97XX_GPIO_POL_HIGH) 241 reg |= gpio; 242 else 243 reg &= ~gpio; 244 245 wm97xx_reg_write(wm, AC97_GPIO_POLARITY, reg); 246 reg = wm97xx_reg_read(wm, AC97_GPIO_STICKY); 247 248 if (sticky == WM97XX_GPIO_STICKY) 249 reg |= gpio; 250 else 251 reg &= ~gpio; 252 253 wm97xx_reg_write(wm, AC97_GPIO_STICKY, reg); 254 reg = wm97xx_reg_read(wm, AC97_GPIO_WAKEUP); 255 256 if (wake == WM97XX_GPIO_WAKE) 257 reg |= gpio; 258 else 259 reg &= ~gpio; 260 261 wm97xx_reg_write(wm, AC97_GPIO_WAKEUP, reg); 262 reg = wm97xx_reg_read(wm, AC97_GPIO_CFG); 263 264 if (dir == WM97XX_GPIO_IN) 265 reg |= gpio; 266 else 267 reg &= ~gpio; 268 269 wm97xx_reg_write(wm, AC97_GPIO_CFG, reg); 270 mutex_unlock(&wm->codec_mutex); 271 } 272 EXPORT_SYMBOL_GPL(wm97xx_config_gpio); 273 274 /* 275 * Configure the WM97XX_PRP value to use while system is suspended. 276 * If a value other than 0 is set then WM97xx pen detection will be 277 * left enabled in the configured mode while the system is in suspend, 278 * the device has users and suspend has not been disabled via the 279 * wakeup sysfs entries. 280 * 281 * @wm: WM97xx device to configure 282 * @mode: WM97XX_PRP value to configure while suspended 283 */ 284 void wm97xx_set_suspend_mode(struct wm97xx *wm, u16 mode) 285 { 286 wm->suspend_mode = mode; 287 device_init_wakeup(&wm->input_dev->dev, mode != 0); 288 } 289 EXPORT_SYMBOL_GPL(wm97xx_set_suspend_mode); 290 291 /* 292 * Handle a pen down interrupt. 293 */ 294 static void wm97xx_pen_irq_worker(struct work_struct *work) 295 { 296 struct wm97xx *wm = container_of(work, struct wm97xx, pen_event_work); 297 int pen_was_down = wm->pen_is_down; 298 299 /* do we need to enable the touch panel reader */ 300 if (wm->id == WM9705_ID2) { 301 if (wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER_RD) & 302 WM97XX_PEN_DOWN) 303 wm->pen_is_down = 1; 304 else 305 wm->pen_is_down = 0; 306 } else { 307 u16 status, pol; 308 mutex_lock(&wm->codec_mutex); 309 status = wm97xx_reg_read(wm, AC97_GPIO_STATUS); 310 pol = wm97xx_reg_read(wm, AC97_GPIO_POLARITY); 311 312 if (WM97XX_GPIO_13 & pol & status) { 313 wm->pen_is_down = 1; 314 wm97xx_reg_write(wm, AC97_GPIO_POLARITY, pol & 315 ~WM97XX_GPIO_13); 316 } else { 317 wm->pen_is_down = 0; 318 wm97xx_reg_write(wm, AC97_GPIO_POLARITY, pol | 319 WM97XX_GPIO_13); 320 } 321 322 if (wm->id == WM9712_ID2 && wm->variant != WM97xx_WM1613) 323 wm97xx_reg_write(wm, AC97_GPIO_STATUS, (status & 324 ~WM97XX_GPIO_13) << 1); 325 else 326 wm97xx_reg_write(wm, AC97_GPIO_STATUS, status & 327 ~WM97XX_GPIO_13); 328 mutex_unlock(&wm->codec_mutex); 329 } 330 331 /* If the system is not using continuous mode or it provides a 332 * pen down operation then we need to schedule polls while the 333 * pen is down. Otherwise the machine driver is responsible 334 * for scheduling reads. 335 */ 336 if (!wm->mach_ops->acc_enabled || wm->mach_ops->acc_pen_down) { 337 if (wm->pen_is_down && !pen_was_down) { 338 /* Data is not availiable immediately on pen down */ 339 queue_delayed_work(wm->ts_workq, &wm->ts_reader, 1); 340 } 341 342 /* Let ts_reader report the pen up for debounce. */ 343 if (!wm->pen_is_down && pen_was_down) 344 wm->pen_is_down = 1; 345 } 346 347 if (!wm->pen_is_down && wm->mach_ops->acc_enabled) 348 wm->mach_ops->acc_pen_up(wm); 349 350 wm->mach_ops->irq_enable(wm, 1); 351 } 352 353 /* 354 * Codec PENDOWN irq handler 355 * 356 * We have to disable the codec interrupt in the handler because it 357 * can take upto 1ms to clear the interrupt source. We schedule a task 358 * in a work queue to do the actual interaction with the chip. The 359 * interrupt is then enabled again in the slow handler when the source 360 * has been cleared. 361 */ 362 static irqreturn_t wm97xx_pen_interrupt(int irq, void *dev_id) 363 { 364 struct wm97xx *wm = dev_id; 365 366 if (!work_pending(&wm->pen_event_work)) { 367 wm->mach_ops->irq_enable(wm, 0); 368 queue_work(wm->ts_workq, &wm->pen_event_work); 369 } 370 371 return IRQ_HANDLED; 372 } 373 374 /* 375 * initialise pen IRQ handler and workqueue 376 */ 377 static int wm97xx_init_pen_irq(struct wm97xx *wm) 378 { 379 u16 reg; 380 381 /* If an interrupt is supplied an IRQ enable operation must also be 382 * provided. */ 383 BUG_ON(!wm->mach_ops->irq_enable); 384 385 if (request_irq(wm->pen_irq, wm97xx_pen_interrupt, IRQF_SHARED, 386 "wm97xx-pen", wm)) { 387 dev_err(wm->dev, 388 "Failed to register pen down interrupt, polling"); 389 wm->pen_irq = 0; 390 return -EINVAL; 391 } 392 393 /* Configure GPIO as interrupt source on WM971x */ 394 if (wm->id != WM9705_ID2) { 395 BUG_ON(!wm->mach_ops->irq_gpio); 396 reg = wm97xx_reg_read(wm, AC97_MISC_AFE); 397 wm97xx_reg_write(wm, AC97_MISC_AFE, 398 reg & ~(wm->mach_ops->irq_gpio)); 399 reg = wm97xx_reg_read(wm, 0x5a); 400 wm97xx_reg_write(wm, 0x5a, reg & ~0x0001); 401 } 402 403 return 0; 404 } 405 406 static int wm97xx_read_samples(struct wm97xx *wm) 407 { 408 struct wm97xx_data data; 409 int rc; 410 411 mutex_lock(&wm->codec_mutex); 412 413 if (wm->mach_ops && wm->mach_ops->acc_enabled) 414 rc = wm->mach_ops->acc_pen_down(wm); 415 else 416 rc = wm->codec->poll_touch(wm, &data); 417 418 if (rc & RC_PENUP) { 419 if (wm->pen_is_down) { 420 wm->pen_is_down = 0; 421 dev_dbg(wm->dev, "pen up\n"); 422 input_report_abs(wm->input_dev, ABS_PRESSURE, 0); 423 input_report_key(wm->input_dev, BTN_TOUCH, 0); 424 input_sync(wm->input_dev); 425 } else if (!(rc & RC_AGAIN)) { 426 /* We need high frequency updates only while 427 * pen is down, the user never will be able to 428 * touch screen faster than a few times per 429 * second... On the other hand, when the user 430 * is actively working with the touchscreen we 431 * don't want to lose the quick response. So we 432 * will slowly increase sleep time after the 433 * pen is up and quicky restore it to ~one task 434 * switch when pen is down again. 435 */ 436 if (wm->ts_reader_interval < HZ / 10) 437 wm->ts_reader_interval++; 438 } 439 440 } else if (rc & RC_VALID) { 441 dev_dbg(wm->dev, 442 "pen down: x=%x:%d, y=%x:%d, pressure=%x:%d\n", 443 data.x >> 12, data.x & 0xfff, data.y >> 12, 444 data.y & 0xfff, data.p >> 12, data.p & 0xfff); 445 input_report_abs(wm->input_dev, ABS_X, data.x & 0xfff); 446 input_report_abs(wm->input_dev, ABS_Y, data.y & 0xfff); 447 input_report_abs(wm->input_dev, ABS_PRESSURE, data.p & 0xfff); 448 input_report_key(wm->input_dev, BTN_TOUCH, 1); 449 input_sync(wm->input_dev); 450 wm->pen_is_down = 1; 451 wm->ts_reader_interval = wm->ts_reader_min_interval; 452 } else if (rc & RC_PENDOWN) { 453 dev_dbg(wm->dev, "pen down\n"); 454 wm->pen_is_down = 1; 455 wm->ts_reader_interval = wm->ts_reader_min_interval; 456 } 457 458 mutex_unlock(&wm->codec_mutex); 459 return rc; 460 } 461 462 /* 463 * The touchscreen sample reader. 464 */ 465 static void wm97xx_ts_reader(struct work_struct *work) 466 { 467 int rc; 468 struct wm97xx *wm = container_of(work, struct wm97xx, ts_reader.work); 469 470 BUG_ON(!wm->codec); 471 472 do { 473 rc = wm97xx_read_samples(wm); 474 } while (rc & RC_AGAIN); 475 476 if (wm->pen_is_down || !wm->pen_irq) 477 queue_delayed_work(wm->ts_workq, &wm->ts_reader, 478 wm->ts_reader_interval); 479 } 480 481 /** 482 * wm97xx_ts_input_open - Open the touch screen input device. 483 * @idev: Input device to be opened. 484 * 485 * Called by the input sub system to open a wm97xx touchscreen device. 486 * Starts the touchscreen thread and touch digitiser. 487 */ 488 static int wm97xx_ts_input_open(struct input_dev *idev) 489 { 490 struct wm97xx *wm = input_get_drvdata(idev); 491 492 wm->ts_workq = create_singlethread_workqueue("kwm97xx"); 493 if (wm->ts_workq == NULL) { 494 dev_err(wm->dev, 495 "Failed to create workqueue\n"); 496 return -EINVAL; 497 } 498 499 /* start digitiser */ 500 if (wm->mach_ops && wm->mach_ops->acc_enabled) 501 wm->codec->acc_enable(wm, 1); 502 wm->codec->dig_enable(wm, 1); 503 504 INIT_DELAYED_WORK(&wm->ts_reader, wm97xx_ts_reader); 505 INIT_WORK(&wm->pen_event_work, wm97xx_pen_irq_worker); 506 507 wm->ts_reader_min_interval = HZ >= 100 ? HZ / 100 : 1; 508 if (wm->ts_reader_min_interval < 1) 509 wm->ts_reader_min_interval = 1; 510 wm->ts_reader_interval = wm->ts_reader_min_interval; 511 512 wm->pen_is_down = 0; 513 if (wm->pen_irq) 514 wm97xx_init_pen_irq(wm); 515 else 516 dev_err(wm->dev, "No IRQ specified\n"); 517 518 /* If we either don't have an interrupt for pen down events or 519 * failed to acquire it then we need to poll. 520 */ 521 if (wm->pen_irq == 0) 522 queue_delayed_work(wm->ts_workq, &wm->ts_reader, 523 wm->ts_reader_interval); 524 525 return 0; 526 } 527 528 /** 529 * wm97xx_ts_input_close - Close the touch screen input device. 530 * @idev: Input device to be closed. 531 * 532 * Called by the input sub system to close a wm97xx touchscreen 533 * device. Kills the touchscreen thread and stops the touch 534 * digitiser. 535 */ 536 537 static void wm97xx_ts_input_close(struct input_dev *idev) 538 { 539 struct wm97xx *wm = input_get_drvdata(idev); 540 u16 reg; 541 542 if (wm->pen_irq) { 543 /* Return the interrupt to GPIO usage (disabling it) */ 544 if (wm->id != WM9705_ID2) { 545 BUG_ON(!wm->mach_ops->irq_gpio); 546 reg = wm97xx_reg_read(wm, AC97_MISC_AFE); 547 wm97xx_reg_write(wm, AC97_MISC_AFE, 548 reg | wm->mach_ops->irq_gpio); 549 } 550 551 free_irq(wm->pen_irq, wm); 552 } 553 554 wm->pen_is_down = 0; 555 556 /* Balance out interrupt disables/enables */ 557 if (cancel_work_sync(&wm->pen_event_work)) 558 wm->mach_ops->irq_enable(wm, 1); 559 560 /* ts_reader rearms itself so we need to explicitly stop it 561 * before we destroy the workqueue. 562 */ 563 cancel_delayed_work_sync(&wm->ts_reader); 564 565 destroy_workqueue(wm->ts_workq); 566 567 /* stop digitiser */ 568 wm->codec->dig_enable(wm, 0); 569 if (wm->mach_ops && wm->mach_ops->acc_enabled) 570 wm->codec->acc_enable(wm, 0); 571 } 572 573 static int wm97xx_probe(struct device *dev) 574 { 575 struct wm97xx *wm; 576 struct wm97xx_pdata *pdata = dev->platform_data; 577 int ret = 0, id = 0; 578 579 wm = kzalloc(sizeof(struct wm97xx), GFP_KERNEL); 580 if (!wm) 581 return -ENOMEM; 582 mutex_init(&wm->codec_mutex); 583 584 wm->dev = dev; 585 dev_set_drvdata(dev, wm); 586 wm->ac97 = to_ac97_t(dev); 587 588 /* check that we have a supported codec */ 589 id = wm97xx_reg_read(wm, AC97_VENDOR_ID1); 590 if (id != WM97XX_ID1) { 591 dev_err(dev, "Device with vendor %04x is not a wm97xx\n", id); 592 ret = -ENODEV; 593 goto alloc_err; 594 } 595 596 wm->id = wm97xx_reg_read(wm, AC97_VENDOR_ID2); 597 598 wm->variant = WM97xx_GENERIC; 599 600 dev_info(wm->dev, "detected a wm97%02x codec\n", wm->id & 0xff); 601 602 switch (wm->id & 0xff) { 603 #ifdef CONFIG_TOUCHSCREEN_WM9705 604 case 0x05: 605 wm->codec = &wm9705_codec; 606 break; 607 #endif 608 #ifdef CONFIG_TOUCHSCREEN_WM9712 609 case 0x12: 610 wm->codec = &wm9712_codec; 611 break; 612 #endif 613 #ifdef CONFIG_TOUCHSCREEN_WM9713 614 case 0x13: 615 wm->codec = &wm9713_codec; 616 break; 617 #endif 618 default: 619 dev_err(wm->dev, "Support for wm97%02x not compiled in.\n", 620 wm->id & 0xff); 621 ret = -ENODEV; 622 goto alloc_err; 623 } 624 625 /* set up physical characteristics */ 626 wm->codec->phy_init(wm); 627 628 /* load gpio cache */ 629 wm->gpio[0] = wm97xx_reg_read(wm, AC97_GPIO_CFG); 630 wm->gpio[1] = wm97xx_reg_read(wm, AC97_GPIO_POLARITY); 631 wm->gpio[2] = wm97xx_reg_read(wm, AC97_GPIO_STICKY); 632 wm->gpio[3] = wm97xx_reg_read(wm, AC97_GPIO_WAKEUP); 633 wm->gpio[4] = wm97xx_reg_read(wm, AC97_GPIO_STATUS); 634 wm->gpio[5] = wm97xx_reg_read(wm, AC97_MISC_AFE); 635 636 wm->input_dev = input_allocate_device(); 637 if (wm->input_dev == NULL) { 638 ret = -ENOMEM; 639 goto alloc_err; 640 } 641 642 /* set up touch configuration */ 643 wm->input_dev->name = "wm97xx touchscreen"; 644 wm->input_dev->phys = "wm97xx"; 645 wm->input_dev->open = wm97xx_ts_input_open; 646 wm->input_dev->close = wm97xx_ts_input_close; 647 648 __set_bit(EV_ABS, wm->input_dev->evbit); 649 __set_bit(EV_KEY, wm->input_dev->evbit); 650 __set_bit(BTN_TOUCH, wm->input_dev->keybit); 651 652 input_set_abs_params(wm->input_dev, ABS_X, abs_x[0], abs_x[1], 653 abs_x[2], 0); 654 input_set_abs_params(wm->input_dev, ABS_Y, abs_y[0], abs_y[1], 655 abs_y[2], 0); 656 input_set_abs_params(wm->input_dev, ABS_PRESSURE, abs_p[0], abs_p[1], 657 abs_p[2], 0); 658 659 input_set_drvdata(wm->input_dev, wm); 660 wm->input_dev->dev.parent = dev; 661 662 ret = input_register_device(wm->input_dev); 663 if (ret < 0) 664 goto dev_alloc_err; 665 666 /* register our battery device */ 667 wm->battery_dev = platform_device_alloc("wm97xx-battery", -1); 668 if (!wm->battery_dev) { 669 ret = -ENOMEM; 670 goto batt_err; 671 } 672 platform_set_drvdata(wm->battery_dev, wm); 673 wm->battery_dev->dev.parent = dev; 674 wm->battery_dev->dev.platform_data = pdata; 675 ret = platform_device_add(wm->battery_dev); 676 if (ret < 0) 677 goto batt_reg_err; 678 679 /* register our extended touch device (for machine specific 680 * extensions) */ 681 wm->touch_dev = platform_device_alloc("wm97xx-touch", -1); 682 if (!wm->touch_dev) { 683 ret = -ENOMEM; 684 goto touch_err; 685 } 686 platform_set_drvdata(wm->touch_dev, wm); 687 wm->touch_dev->dev.parent = dev; 688 wm->touch_dev->dev.platform_data = pdata; 689 ret = platform_device_add(wm->touch_dev); 690 if (ret < 0) 691 goto touch_reg_err; 692 693 return ret; 694 695 touch_reg_err: 696 platform_device_put(wm->touch_dev); 697 touch_err: 698 platform_device_del(wm->battery_dev); 699 batt_reg_err: 700 platform_device_put(wm->battery_dev); 701 batt_err: 702 input_unregister_device(wm->input_dev); 703 wm->input_dev = NULL; 704 dev_alloc_err: 705 input_free_device(wm->input_dev); 706 alloc_err: 707 kfree(wm); 708 709 return ret; 710 } 711 712 static int wm97xx_remove(struct device *dev) 713 { 714 struct wm97xx *wm = dev_get_drvdata(dev); 715 716 platform_device_unregister(wm->battery_dev); 717 platform_device_unregister(wm->touch_dev); 718 input_unregister_device(wm->input_dev); 719 kfree(wm); 720 721 return 0; 722 } 723 724 #ifdef CONFIG_PM 725 static int wm97xx_suspend(struct device *dev, pm_message_t state) 726 { 727 struct wm97xx *wm = dev_get_drvdata(dev); 728 u16 reg; 729 int suspend_mode; 730 731 if (device_may_wakeup(&wm->input_dev->dev)) 732 suspend_mode = wm->suspend_mode; 733 else 734 suspend_mode = 0; 735 736 if (wm->input_dev->users) 737 cancel_delayed_work_sync(&wm->ts_reader); 738 739 /* Power down the digitiser (bypassing the cache for resume) */ 740 reg = wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER2); 741 reg &= ~WM97XX_PRP_DET_DIG; 742 if (wm->input_dev->users) 743 reg |= suspend_mode; 744 wm->ac97->bus->ops->write(wm->ac97, AC97_WM97XX_DIGITISER2, reg); 745 746 /* WM9713 has an additional power bit - turn it off if there 747 * are no users or if suspend mode is zero. */ 748 if (wm->id == WM9713_ID2 && 749 (!wm->input_dev->users || !suspend_mode)) { 750 reg = wm97xx_reg_read(wm, AC97_EXTENDED_MID) | 0x8000; 751 wm97xx_reg_write(wm, AC97_EXTENDED_MID, reg); 752 } 753 754 return 0; 755 } 756 757 static int wm97xx_resume(struct device *dev) 758 { 759 struct wm97xx *wm = dev_get_drvdata(dev); 760 761 /* restore digitiser and gpios */ 762 if (wm->id == WM9713_ID2) { 763 wm97xx_reg_write(wm, AC97_WM9713_DIG1, wm->dig[0]); 764 wm97xx_reg_write(wm, 0x5a, wm->misc); 765 if (wm->input_dev->users) { 766 u16 reg; 767 reg = wm97xx_reg_read(wm, AC97_EXTENDED_MID) & 0x7fff; 768 wm97xx_reg_write(wm, AC97_EXTENDED_MID, reg); 769 } 770 } 771 772 wm97xx_reg_write(wm, AC97_WM9713_DIG2, wm->dig[1]); 773 wm97xx_reg_write(wm, AC97_WM9713_DIG3, wm->dig[2]); 774 775 wm97xx_reg_write(wm, AC97_GPIO_CFG, wm->gpio[0]); 776 wm97xx_reg_write(wm, AC97_GPIO_POLARITY, wm->gpio[1]); 777 wm97xx_reg_write(wm, AC97_GPIO_STICKY, wm->gpio[2]); 778 wm97xx_reg_write(wm, AC97_GPIO_WAKEUP, wm->gpio[3]); 779 wm97xx_reg_write(wm, AC97_GPIO_STATUS, wm->gpio[4]); 780 wm97xx_reg_write(wm, AC97_MISC_AFE, wm->gpio[5]); 781 782 if (wm->input_dev->users && !wm->pen_irq) { 783 wm->ts_reader_interval = wm->ts_reader_min_interval; 784 queue_delayed_work(wm->ts_workq, &wm->ts_reader, 785 wm->ts_reader_interval); 786 } 787 788 return 0; 789 } 790 791 #else 792 #define wm97xx_suspend NULL 793 #define wm97xx_resume NULL 794 #endif 795 796 /* 797 * Machine specific operations 798 */ 799 int wm97xx_register_mach_ops(struct wm97xx *wm, 800 struct wm97xx_mach_ops *mach_ops) 801 { 802 mutex_lock(&wm->codec_mutex); 803 if (wm->mach_ops) { 804 mutex_unlock(&wm->codec_mutex); 805 return -EINVAL; 806 } 807 wm->mach_ops = mach_ops; 808 mutex_unlock(&wm->codec_mutex); 809 810 return 0; 811 } 812 EXPORT_SYMBOL_GPL(wm97xx_register_mach_ops); 813 814 void wm97xx_unregister_mach_ops(struct wm97xx *wm) 815 { 816 mutex_lock(&wm->codec_mutex); 817 wm->mach_ops = NULL; 818 mutex_unlock(&wm->codec_mutex); 819 } 820 EXPORT_SYMBOL_GPL(wm97xx_unregister_mach_ops); 821 822 static struct device_driver wm97xx_driver = { 823 .name = "wm97xx-ts", 824 .bus = &ac97_bus_type, 825 .owner = THIS_MODULE, 826 .probe = wm97xx_probe, 827 .remove = wm97xx_remove, 828 .suspend = wm97xx_suspend, 829 .resume = wm97xx_resume, 830 }; 831 832 static int __init wm97xx_init(void) 833 { 834 return driver_register(&wm97xx_driver); 835 } 836 837 static void __exit wm97xx_exit(void) 838 { 839 driver_unregister(&wm97xx_driver); 840 } 841 842 module_init(wm97xx_init); 843 module_exit(wm97xx_exit); 844 845 /* Module information */ 846 MODULE_AUTHOR("Liam Girdwood <lrg@slimlogic.co.uk>"); 847 MODULE_DESCRIPTION("WM97xx Core - Touch Screen / AUX ADC / GPIO Driver"); 848 MODULE_LICENSE("GPL"); 849