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 52 #define TS_NAME "wm97xx" 53 #define WM_CORE_VERSION "1.00" 54 #define DEFAULT_PRESSURE 0xb0c0 55 56 57 /* 58 * Touchscreen absolute values 59 * 60 * These parameters are used to help the input layer discard out of 61 * range readings and reduce jitter etc. 62 * 63 * o min, max:- indicate the min and max values your touch screen returns 64 * o fuzz:- use a higher number to reduce jitter 65 * 66 * The default values correspond to Mainstone II in QVGA mode 67 * 68 * Please read 69 * Documentation/input/input-programming.txt for more details. 70 */ 71 72 static int abs_x[3] = {350, 3900, 5}; 73 module_param_array(abs_x, int, NULL, 0); 74 MODULE_PARM_DESC(abs_x, "Touchscreen absolute X min, max, fuzz"); 75 76 static int abs_y[3] = {320, 3750, 40}; 77 module_param_array(abs_y, int, NULL, 0); 78 MODULE_PARM_DESC(abs_y, "Touchscreen absolute Y min, max, fuzz"); 79 80 static int abs_p[3] = {0, 150, 4}; 81 module_param_array(abs_p, int, NULL, 0); 82 MODULE_PARM_DESC(abs_p, "Touchscreen absolute Pressure min, max, fuzz"); 83 84 /* 85 * wm97xx IO access, all IO locking done by AC97 layer 86 */ 87 int wm97xx_reg_read(struct wm97xx *wm, u16 reg) 88 { 89 if (wm->ac97) 90 return wm->ac97->bus->ops->read(wm->ac97, reg); 91 else 92 return -1; 93 } 94 EXPORT_SYMBOL_GPL(wm97xx_reg_read); 95 96 void wm97xx_reg_write(struct wm97xx *wm, u16 reg, u16 val) 97 { 98 /* cache digitiser registers */ 99 if (reg >= AC97_WM9713_DIG1 && reg <= AC97_WM9713_DIG3) 100 wm->dig[(reg - AC97_WM9713_DIG1) >> 1] = val; 101 102 /* cache gpio regs */ 103 if (reg >= AC97_GPIO_CFG && reg <= AC97_MISC_AFE) 104 wm->gpio[(reg - AC97_GPIO_CFG) >> 1] = val; 105 106 /* wm9713 irq reg */ 107 if (reg == 0x5a) 108 wm->misc = val; 109 110 if (wm->ac97) 111 wm->ac97->bus->ops->write(wm->ac97, reg, val); 112 } 113 EXPORT_SYMBOL_GPL(wm97xx_reg_write); 114 115 /** 116 * wm97xx_read_aux_adc - Read the aux adc. 117 * @wm: wm97xx device. 118 * @adcsel: codec ADC to be read 119 * 120 * Reads the selected AUX ADC. 121 */ 122 123 int wm97xx_read_aux_adc(struct wm97xx *wm, u16 adcsel) 124 { 125 int power_adc = 0, auxval; 126 u16 power = 0; 127 128 /* get codec */ 129 mutex_lock(&wm->codec_mutex); 130 131 /* When the touchscreen is not in use, we may have to power up 132 * the AUX ADC before we can use sample the AUX inputs-> 133 */ 134 if (wm->id == WM9713_ID2 && 135 (power = wm97xx_reg_read(wm, AC97_EXTENDED_MID)) & 0x8000) { 136 power_adc = 1; 137 wm97xx_reg_write(wm, AC97_EXTENDED_MID, power & 0x7fff); 138 } 139 140 /* Prepare the codec for AUX reading */ 141 wm->codec->aux_prepare(wm); 142 143 /* Turn polling mode on to read AUX ADC */ 144 wm->pen_probably_down = 1; 145 wm->codec->poll_sample(wm, adcsel, &auxval); 146 147 if (power_adc) 148 wm97xx_reg_write(wm, AC97_EXTENDED_MID, power | 0x8000); 149 150 wm->codec->dig_restore(wm); 151 152 wm->pen_probably_down = 0; 153 154 mutex_unlock(&wm->codec_mutex); 155 return auxval & 0xfff; 156 } 157 EXPORT_SYMBOL_GPL(wm97xx_read_aux_adc); 158 159 /** 160 * wm97xx_get_gpio - Get the status of a codec GPIO. 161 * @wm: wm97xx device. 162 * @gpio: gpio 163 * 164 * Get the status of a codec GPIO pin 165 */ 166 167 enum wm97xx_gpio_status wm97xx_get_gpio(struct wm97xx *wm, u32 gpio) 168 { 169 u16 status; 170 enum wm97xx_gpio_status ret; 171 172 mutex_lock(&wm->codec_mutex); 173 status = wm97xx_reg_read(wm, AC97_GPIO_STATUS); 174 175 if (status & gpio) 176 ret = WM97XX_GPIO_HIGH; 177 else 178 ret = WM97XX_GPIO_LOW; 179 180 mutex_unlock(&wm->codec_mutex); 181 return ret; 182 } 183 EXPORT_SYMBOL_GPL(wm97xx_get_gpio); 184 185 /** 186 * wm97xx_set_gpio - Set the status of a codec GPIO. 187 * @wm: wm97xx device. 188 * @gpio: gpio 189 * 190 * 191 * Set the status of a codec GPIO pin 192 */ 193 194 void wm97xx_set_gpio(struct wm97xx *wm, u32 gpio, 195 enum wm97xx_gpio_status status) 196 { 197 u16 reg; 198 199 mutex_lock(&wm->codec_mutex); 200 reg = wm97xx_reg_read(wm, AC97_GPIO_STATUS); 201 202 if (status & WM97XX_GPIO_HIGH) 203 reg |= gpio; 204 else 205 reg &= ~gpio; 206 207 if (wm->id == WM9712_ID2) 208 wm97xx_reg_write(wm, AC97_GPIO_STATUS, reg << 1); 209 else 210 wm97xx_reg_write(wm, AC97_GPIO_STATUS, reg); 211 mutex_unlock(&wm->codec_mutex); 212 } 213 EXPORT_SYMBOL_GPL(wm97xx_set_gpio); 214 215 /* 216 * Codec GPIO pin configuration, this sets pin direction, polarity, 217 * stickyness and wake up. 218 */ 219 void wm97xx_config_gpio(struct wm97xx *wm, u32 gpio, enum wm97xx_gpio_dir dir, 220 enum wm97xx_gpio_pol pol, enum wm97xx_gpio_sticky sticky, 221 enum wm97xx_gpio_wake wake) 222 { 223 u16 reg; 224 225 mutex_lock(&wm->codec_mutex); 226 reg = wm97xx_reg_read(wm, AC97_GPIO_POLARITY); 227 228 if (pol == WM97XX_GPIO_POL_HIGH) 229 reg |= gpio; 230 else 231 reg &= ~gpio; 232 233 wm97xx_reg_write(wm, AC97_GPIO_POLARITY, reg); 234 reg = wm97xx_reg_read(wm, AC97_GPIO_STICKY); 235 236 if (sticky == WM97XX_GPIO_STICKY) 237 reg |= gpio; 238 else 239 reg &= ~gpio; 240 241 wm97xx_reg_write(wm, AC97_GPIO_STICKY, reg); 242 reg = wm97xx_reg_read(wm, AC97_GPIO_WAKEUP); 243 244 if (wake == WM97XX_GPIO_WAKE) 245 reg |= gpio; 246 else 247 reg &= ~gpio; 248 249 wm97xx_reg_write(wm, AC97_GPIO_WAKEUP, reg); 250 reg = wm97xx_reg_read(wm, AC97_GPIO_CFG); 251 252 if (dir == WM97XX_GPIO_IN) 253 reg |= gpio; 254 else 255 reg &= ~gpio; 256 257 wm97xx_reg_write(wm, AC97_GPIO_CFG, reg); 258 mutex_unlock(&wm->codec_mutex); 259 } 260 EXPORT_SYMBOL_GPL(wm97xx_config_gpio); 261 262 /* 263 * Configure the WM97XX_PRP value to use while system is suspended. 264 * If a value other than 0 is set then WM97xx pen detection will be 265 * left enabled in the configured mode while the system is in suspend, 266 * the device has users and suspend has not been disabled via the 267 * wakeup sysfs entries. 268 * 269 * @wm: WM97xx device to configure 270 * @mode: WM97XX_PRP value to configure while suspended 271 */ 272 void wm97xx_set_suspend_mode(struct wm97xx *wm, u16 mode) 273 { 274 wm->suspend_mode = mode; 275 device_init_wakeup(&wm->input_dev->dev, mode != 0); 276 } 277 EXPORT_SYMBOL_GPL(wm97xx_set_suspend_mode); 278 279 /* 280 * Handle a pen down interrupt. 281 */ 282 static void wm97xx_pen_irq_worker(struct work_struct *work) 283 { 284 struct wm97xx *wm = container_of(work, struct wm97xx, pen_event_work); 285 int pen_was_down = wm->pen_is_down; 286 287 /* do we need to enable the touch panel reader */ 288 if (wm->id == WM9705_ID2) { 289 if (wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER_RD) & 290 WM97XX_PEN_DOWN) 291 wm->pen_is_down = 1; 292 else 293 wm->pen_is_down = 0; 294 } else { 295 u16 status, pol; 296 mutex_lock(&wm->codec_mutex); 297 status = wm97xx_reg_read(wm, AC97_GPIO_STATUS); 298 pol = wm97xx_reg_read(wm, AC97_GPIO_POLARITY); 299 300 if (WM97XX_GPIO_13 & pol & status) { 301 wm->pen_is_down = 1; 302 wm97xx_reg_write(wm, AC97_GPIO_POLARITY, pol & 303 ~WM97XX_GPIO_13); 304 } else { 305 wm->pen_is_down = 0; 306 wm97xx_reg_write(wm, AC97_GPIO_POLARITY, pol | 307 WM97XX_GPIO_13); 308 } 309 310 if (wm->id == WM9712_ID2) 311 wm97xx_reg_write(wm, AC97_GPIO_STATUS, (status & 312 ~WM97XX_GPIO_13) << 1); 313 else 314 wm97xx_reg_write(wm, AC97_GPIO_STATUS, status & 315 ~WM97XX_GPIO_13); 316 mutex_unlock(&wm->codec_mutex); 317 } 318 319 /* If the system is not using continuous mode or it provides a 320 * pen down operation then we need to schedule polls while the 321 * pen is down. Otherwise the machine driver is responsible 322 * for scheduling reads. 323 */ 324 if (!wm->mach_ops->acc_enabled || wm->mach_ops->acc_pen_down) { 325 if (wm->pen_is_down && !pen_was_down) { 326 /* Data is not availiable immediately on pen down */ 327 queue_delayed_work(wm->ts_workq, &wm->ts_reader, 1); 328 } 329 330 /* Let ts_reader report the pen up for debounce. */ 331 if (!wm->pen_is_down && pen_was_down) 332 wm->pen_is_down = 1; 333 } 334 335 if (!wm->pen_is_down && wm->mach_ops->acc_enabled) 336 wm->mach_ops->acc_pen_up(wm); 337 338 wm->mach_ops->irq_enable(wm, 1); 339 } 340 341 /* 342 * Codec PENDOWN irq handler 343 * 344 * We have to disable the codec interrupt in the handler because it 345 * can take upto 1ms to clear the interrupt source. We schedule a task 346 * in a work queue to do the actual interaction with the chip. The 347 * interrupt is then enabled again in the slow handler when the source 348 * has been cleared. 349 */ 350 static irqreturn_t wm97xx_pen_interrupt(int irq, void *dev_id) 351 { 352 struct wm97xx *wm = dev_id; 353 354 if (!work_pending(&wm->pen_event_work)) { 355 wm->mach_ops->irq_enable(wm, 0); 356 queue_work(wm->ts_workq, &wm->pen_event_work); 357 } 358 359 return IRQ_HANDLED; 360 } 361 362 /* 363 * initialise pen IRQ handler and workqueue 364 */ 365 static int wm97xx_init_pen_irq(struct wm97xx *wm) 366 { 367 u16 reg; 368 369 /* If an interrupt is supplied an IRQ enable operation must also be 370 * provided. */ 371 BUG_ON(!wm->mach_ops->irq_enable); 372 373 if (request_irq(wm->pen_irq, wm97xx_pen_interrupt, IRQF_SHARED, 374 "wm97xx-pen", wm)) { 375 dev_err(wm->dev, 376 "Failed to register pen down interrupt, polling"); 377 wm->pen_irq = 0; 378 return -EINVAL; 379 } 380 381 /* Configure GPIO as interrupt source on WM971x */ 382 if (wm->id != WM9705_ID2) { 383 BUG_ON(!wm->mach_ops->irq_gpio); 384 reg = wm97xx_reg_read(wm, AC97_MISC_AFE); 385 wm97xx_reg_write(wm, AC97_MISC_AFE, 386 reg & ~(wm->mach_ops->irq_gpio)); 387 reg = wm97xx_reg_read(wm, 0x5a); 388 wm97xx_reg_write(wm, 0x5a, reg & ~0x0001); 389 } 390 391 return 0; 392 } 393 394 static int wm97xx_read_samples(struct wm97xx *wm) 395 { 396 struct wm97xx_data data; 397 int rc; 398 399 mutex_lock(&wm->codec_mutex); 400 401 if (wm->mach_ops && wm->mach_ops->acc_enabled) 402 rc = wm->mach_ops->acc_pen_down(wm); 403 else 404 rc = wm->codec->poll_touch(wm, &data); 405 406 if (rc & RC_PENUP) { 407 if (wm->pen_is_down) { 408 wm->pen_is_down = 0; 409 dev_dbg(wm->dev, "pen up\n"); 410 input_report_abs(wm->input_dev, ABS_PRESSURE, 0); 411 input_report_key(wm->input_dev, BTN_TOUCH, 0); 412 input_sync(wm->input_dev); 413 } else if (!(rc & RC_AGAIN)) { 414 /* We need high frequency updates only while 415 * pen is down, the user never will be able to 416 * touch screen faster than a few times per 417 * second... On the other hand, when the user 418 * is actively working with the touchscreen we 419 * don't want to lose the quick response. So we 420 * will slowly increase sleep time after the 421 * pen is up and quicky restore it to ~one task 422 * switch when pen is down again. 423 */ 424 if (wm->ts_reader_interval < HZ / 10) 425 wm->ts_reader_interval++; 426 } 427 428 } else if (rc & RC_VALID) { 429 dev_dbg(wm->dev, 430 "pen down: x=%x:%d, y=%x:%d, pressure=%x:%d\n", 431 data.x >> 12, data.x & 0xfff, data.y >> 12, 432 data.y & 0xfff, data.p >> 12, data.p & 0xfff); 433 input_report_abs(wm->input_dev, ABS_X, data.x & 0xfff); 434 input_report_abs(wm->input_dev, ABS_Y, data.y & 0xfff); 435 input_report_abs(wm->input_dev, ABS_PRESSURE, data.p & 0xfff); 436 input_report_key(wm->input_dev, BTN_TOUCH, 1); 437 input_sync(wm->input_dev); 438 wm->pen_is_down = 1; 439 wm->ts_reader_interval = wm->ts_reader_min_interval; 440 } else if (rc & RC_PENDOWN) { 441 dev_dbg(wm->dev, "pen down\n"); 442 wm->pen_is_down = 1; 443 wm->ts_reader_interval = wm->ts_reader_min_interval; 444 } 445 446 mutex_unlock(&wm->codec_mutex); 447 return rc; 448 } 449 450 /* 451 * The touchscreen sample reader. 452 */ 453 static void wm97xx_ts_reader(struct work_struct *work) 454 { 455 int rc; 456 struct wm97xx *wm = container_of(work, struct wm97xx, ts_reader.work); 457 458 BUG_ON(!wm->codec); 459 460 do { 461 rc = wm97xx_read_samples(wm); 462 } while (rc & RC_AGAIN); 463 464 if (wm->pen_is_down || !wm->pen_irq) 465 queue_delayed_work(wm->ts_workq, &wm->ts_reader, 466 wm->ts_reader_interval); 467 } 468 469 /** 470 * wm97xx_ts_input_open - Open the touch screen input device. 471 * @idev: Input device to be opened. 472 * 473 * Called by the input sub system to open a wm97xx touchscreen device. 474 * Starts the touchscreen thread and touch digitiser. 475 */ 476 static int wm97xx_ts_input_open(struct input_dev *idev) 477 { 478 struct wm97xx *wm = input_get_drvdata(idev); 479 480 wm->ts_workq = create_singlethread_workqueue("kwm97xx"); 481 if (wm->ts_workq == NULL) { 482 dev_err(wm->dev, 483 "Failed to create workqueue\n"); 484 return -EINVAL; 485 } 486 487 /* start digitiser */ 488 if (wm->mach_ops && wm->mach_ops->acc_enabled) 489 wm->codec->acc_enable(wm, 1); 490 wm->codec->dig_enable(wm, 1); 491 492 INIT_DELAYED_WORK(&wm->ts_reader, wm97xx_ts_reader); 493 INIT_WORK(&wm->pen_event_work, wm97xx_pen_irq_worker); 494 495 wm->ts_reader_min_interval = HZ >= 100 ? HZ / 100 : 1; 496 if (wm->ts_reader_min_interval < 1) 497 wm->ts_reader_min_interval = 1; 498 wm->ts_reader_interval = wm->ts_reader_min_interval; 499 500 wm->pen_is_down = 0; 501 if (wm->pen_irq) 502 wm97xx_init_pen_irq(wm); 503 else 504 dev_err(wm->dev, "No IRQ specified\n"); 505 506 /* If we either don't have an interrupt for pen down events or 507 * failed to acquire it then we need to poll. 508 */ 509 if (wm->pen_irq == 0) 510 queue_delayed_work(wm->ts_workq, &wm->ts_reader, 511 wm->ts_reader_interval); 512 513 return 0; 514 } 515 516 /** 517 * wm97xx_ts_input_close - Close the touch screen input device. 518 * @idev: Input device to be closed. 519 * 520 * Called by the input sub system to close a wm97xx touchscreen 521 * device. Kills the touchscreen thread and stops the touch 522 * digitiser. 523 */ 524 525 static void wm97xx_ts_input_close(struct input_dev *idev) 526 { 527 struct wm97xx *wm = input_get_drvdata(idev); 528 u16 reg; 529 530 if (wm->pen_irq) { 531 /* Return the interrupt to GPIO usage (disabling it) */ 532 if (wm->id != WM9705_ID2) { 533 BUG_ON(!wm->mach_ops->irq_gpio); 534 reg = wm97xx_reg_read(wm, AC97_MISC_AFE); 535 wm97xx_reg_write(wm, AC97_MISC_AFE, 536 reg | wm->mach_ops->irq_gpio); 537 } 538 539 free_irq(wm->pen_irq, wm); 540 } 541 542 wm->pen_is_down = 0; 543 544 /* Balance out interrupt disables/enables */ 545 if (cancel_work_sync(&wm->pen_event_work)) 546 wm->mach_ops->irq_enable(wm, 1); 547 548 /* ts_reader rearms itself so we need to explicitly stop it 549 * before we destroy the workqueue. 550 */ 551 cancel_delayed_work_sync(&wm->ts_reader); 552 553 destroy_workqueue(wm->ts_workq); 554 555 /* stop digitiser */ 556 wm->codec->dig_enable(wm, 0); 557 if (wm->mach_ops && wm->mach_ops->acc_enabled) 558 wm->codec->acc_enable(wm, 0); 559 } 560 561 static int wm97xx_probe(struct device *dev) 562 { 563 struct wm97xx *wm; 564 int ret = 0, id = 0; 565 566 wm = kzalloc(sizeof(struct wm97xx), GFP_KERNEL); 567 if (!wm) 568 return -ENOMEM; 569 mutex_init(&wm->codec_mutex); 570 571 wm->dev = dev; 572 dev->driver_data = wm; 573 wm->ac97 = to_ac97_t(dev); 574 575 /* check that we have a supported codec */ 576 id = wm97xx_reg_read(wm, AC97_VENDOR_ID1); 577 if (id != WM97XX_ID1) { 578 dev_err(dev, "Device with vendor %04x is not a wm97xx\n", id); 579 ret = -ENODEV; 580 goto alloc_err; 581 } 582 583 wm->id = wm97xx_reg_read(wm, AC97_VENDOR_ID2); 584 585 dev_info(wm->dev, "detected a wm97%02x codec\n", wm->id & 0xff); 586 587 switch (wm->id & 0xff) { 588 #ifdef CONFIG_TOUCHSCREEN_WM9705 589 case 0x05: 590 wm->codec = &wm9705_codec; 591 break; 592 #endif 593 #ifdef CONFIG_TOUCHSCREEN_WM9712 594 case 0x12: 595 wm->codec = &wm9712_codec; 596 break; 597 #endif 598 #ifdef CONFIG_TOUCHSCREEN_WM9713 599 case 0x13: 600 wm->codec = &wm9713_codec; 601 break; 602 #endif 603 default: 604 dev_err(wm->dev, "Support for wm97%02x not compiled in.\n", 605 wm->id & 0xff); 606 ret = -ENODEV; 607 goto alloc_err; 608 } 609 610 /* set up physical characteristics */ 611 wm->codec->phy_init(wm); 612 613 /* load gpio cache */ 614 wm->gpio[0] = wm97xx_reg_read(wm, AC97_GPIO_CFG); 615 wm->gpio[1] = wm97xx_reg_read(wm, AC97_GPIO_POLARITY); 616 wm->gpio[2] = wm97xx_reg_read(wm, AC97_GPIO_STICKY); 617 wm->gpio[3] = wm97xx_reg_read(wm, AC97_GPIO_WAKEUP); 618 wm->gpio[4] = wm97xx_reg_read(wm, AC97_GPIO_STATUS); 619 wm->gpio[5] = wm97xx_reg_read(wm, AC97_MISC_AFE); 620 621 wm->input_dev = input_allocate_device(); 622 if (wm->input_dev == NULL) { 623 ret = -ENOMEM; 624 goto alloc_err; 625 } 626 627 /* set up touch configuration */ 628 wm->input_dev->name = "wm97xx touchscreen"; 629 wm->input_dev->phys = "wm97xx"; 630 wm->input_dev->open = wm97xx_ts_input_open; 631 wm->input_dev->close = wm97xx_ts_input_close; 632 633 __set_bit(EV_ABS, wm->input_dev->evbit); 634 __set_bit(EV_KEY, wm->input_dev->evbit); 635 __set_bit(BTN_TOUCH, wm->input_dev->keybit); 636 637 input_set_abs_params(wm->input_dev, ABS_X, abs_x[0], abs_x[1], 638 abs_x[2], 0); 639 input_set_abs_params(wm->input_dev, ABS_Y, abs_y[0], abs_y[1], 640 abs_y[2], 0); 641 input_set_abs_params(wm->input_dev, ABS_PRESSURE, abs_p[0], abs_p[1], 642 abs_p[2], 0); 643 644 input_set_drvdata(wm->input_dev, wm); 645 wm->input_dev->dev.parent = dev; 646 647 ret = input_register_device(wm->input_dev); 648 if (ret < 0) 649 goto dev_alloc_err; 650 651 /* register our battery device */ 652 wm->battery_dev = platform_device_alloc("wm97xx-battery", -1); 653 if (!wm->battery_dev) { 654 ret = -ENOMEM; 655 goto batt_err; 656 } 657 platform_set_drvdata(wm->battery_dev, wm); 658 wm->battery_dev->dev.parent = dev; 659 ret = platform_device_add(wm->battery_dev); 660 if (ret < 0) 661 goto batt_reg_err; 662 663 /* register our extended touch device (for machine specific 664 * extensions) */ 665 wm->touch_dev = platform_device_alloc("wm97xx-touch", -1); 666 if (!wm->touch_dev) { 667 ret = -ENOMEM; 668 goto touch_err; 669 } 670 platform_set_drvdata(wm->touch_dev, wm); 671 wm->touch_dev->dev.parent = dev; 672 ret = platform_device_add(wm->touch_dev); 673 if (ret < 0) 674 goto touch_reg_err; 675 676 return ret; 677 678 touch_reg_err: 679 platform_device_put(wm->touch_dev); 680 touch_err: 681 platform_device_unregister(wm->battery_dev); 682 wm->battery_dev = NULL; 683 batt_reg_err: 684 platform_device_put(wm->battery_dev); 685 batt_err: 686 input_unregister_device(wm->input_dev); 687 wm->input_dev = NULL; 688 dev_alloc_err: 689 input_free_device(wm->input_dev); 690 alloc_err: 691 kfree(wm); 692 693 return ret; 694 } 695 696 static int wm97xx_remove(struct device *dev) 697 { 698 struct wm97xx *wm = dev_get_drvdata(dev); 699 700 platform_device_unregister(wm->battery_dev); 701 platform_device_unregister(wm->touch_dev); 702 input_unregister_device(wm->input_dev); 703 kfree(wm); 704 705 return 0; 706 } 707 708 #ifdef CONFIG_PM 709 static int wm97xx_suspend(struct device *dev, pm_message_t state) 710 { 711 struct wm97xx *wm = dev_get_drvdata(dev); 712 u16 reg; 713 int suspend_mode; 714 715 if (device_may_wakeup(&wm->input_dev->dev)) 716 suspend_mode = wm->suspend_mode; 717 else 718 suspend_mode = 0; 719 720 if (wm->input_dev->users) 721 cancel_delayed_work_sync(&wm->ts_reader); 722 723 /* Power down the digitiser (bypassing the cache for resume) */ 724 reg = wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER2); 725 reg &= ~WM97XX_PRP_DET_DIG; 726 if (wm->input_dev->users) 727 reg |= suspend_mode; 728 wm->ac97->bus->ops->write(wm->ac97, AC97_WM97XX_DIGITISER2, reg); 729 730 /* WM9713 has an additional power bit - turn it off if there 731 * are no users or if suspend mode is zero. */ 732 if (wm->id == WM9713_ID2 && 733 (!wm->input_dev->users || !suspend_mode)) { 734 reg = wm97xx_reg_read(wm, AC97_EXTENDED_MID) | 0x8000; 735 wm97xx_reg_write(wm, AC97_EXTENDED_MID, reg); 736 } 737 738 return 0; 739 } 740 741 static int wm97xx_resume(struct device *dev) 742 { 743 struct wm97xx *wm = dev_get_drvdata(dev); 744 745 /* restore digitiser and gpios */ 746 if (wm->id == WM9713_ID2) { 747 wm97xx_reg_write(wm, AC97_WM9713_DIG1, wm->dig[0]); 748 wm97xx_reg_write(wm, 0x5a, wm->misc); 749 if (wm->input_dev->users) { 750 u16 reg; 751 reg = wm97xx_reg_read(wm, AC97_EXTENDED_MID) & 0x7fff; 752 wm97xx_reg_write(wm, AC97_EXTENDED_MID, reg); 753 } 754 } 755 756 wm97xx_reg_write(wm, AC97_WM9713_DIG2, wm->dig[1]); 757 wm97xx_reg_write(wm, AC97_WM9713_DIG3, wm->dig[2]); 758 759 wm97xx_reg_write(wm, AC97_GPIO_CFG, wm->gpio[0]); 760 wm97xx_reg_write(wm, AC97_GPIO_POLARITY, wm->gpio[1]); 761 wm97xx_reg_write(wm, AC97_GPIO_STICKY, wm->gpio[2]); 762 wm97xx_reg_write(wm, AC97_GPIO_WAKEUP, wm->gpio[3]); 763 wm97xx_reg_write(wm, AC97_GPIO_STATUS, wm->gpio[4]); 764 wm97xx_reg_write(wm, AC97_MISC_AFE, wm->gpio[5]); 765 766 if (wm->input_dev->users && !wm->pen_irq) { 767 wm->ts_reader_interval = wm->ts_reader_min_interval; 768 queue_delayed_work(wm->ts_workq, &wm->ts_reader, 769 wm->ts_reader_interval); 770 } 771 772 return 0; 773 } 774 775 #else 776 #define wm97xx_suspend NULL 777 #define wm97xx_resume NULL 778 #endif 779 780 /* 781 * Machine specific operations 782 */ 783 int wm97xx_register_mach_ops(struct wm97xx *wm, 784 struct wm97xx_mach_ops *mach_ops) 785 { 786 mutex_lock(&wm->codec_mutex); 787 if (wm->mach_ops) { 788 mutex_unlock(&wm->codec_mutex); 789 return -EINVAL; 790 } 791 wm->mach_ops = mach_ops; 792 mutex_unlock(&wm->codec_mutex); 793 794 return 0; 795 } 796 EXPORT_SYMBOL_GPL(wm97xx_register_mach_ops); 797 798 void wm97xx_unregister_mach_ops(struct wm97xx *wm) 799 { 800 mutex_lock(&wm->codec_mutex); 801 wm->mach_ops = NULL; 802 mutex_unlock(&wm->codec_mutex); 803 } 804 EXPORT_SYMBOL_GPL(wm97xx_unregister_mach_ops); 805 806 static struct device_driver wm97xx_driver = { 807 .name = "wm97xx-ts", 808 .bus = &ac97_bus_type, 809 .owner = THIS_MODULE, 810 .probe = wm97xx_probe, 811 .remove = wm97xx_remove, 812 .suspend = wm97xx_suspend, 813 .resume = wm97xx_resume, 814 }; 815 816 static int __init wm97xx_init(void) 817 { 818 return driver_register(&wm97xx_driver); 819 } 820 821 static void __exit wm97xx_exit(void) 822 { 823 driver_unregister(&wm97xx_driver); 824 } 825 826 module_init(wm97xx_init); 827 module_exit(wm97xx_exit); 828 829 /* Module information */ 830 MODULE_AUTHOR("Liam Girdwood <lrg@slimlogic.co.uk>"); 831 MODULE_DESCRIPTION("WM97xx Core - Touch Screen / AUX ADC / GPIO Driver"); 832 MODULE_LICENSE("GPL"); 833