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 7 * liam.girdwood@wolfsonmicro.com or linux@wolfsonmicro.com 8 * Parts Copyright : Ian Molton <spyro@f2s.com> 9 * Andrew Zabolotny <zap@homelink.ru> 10 * Russell King <rmk@arm.linux.org.uk> 11 * 12 * This program is free software; you can redistribute it and/or modify it 13 * under the terms of the GNU General Public License as published by the 14 * Free Software Foundation; either version 2 of the License, or (at your 15 * option) any later version. 16 * 17 * Notes: 18 * 19 * Features: 20 * - supports WM9705, WM9712, WM9713 21 * - polling mode 22 * - continuous mode (arch-dependent) 23 * - adjustable rpu/dpp settings 24 * - adjustable pressure current 25 * - adjustable sample settle delay 26 * - 4 and 5 wire touchscreens (5 wire is WM9712 only) 27 * - pen down detection 28 * - battery monitor 29 * - sample AUX adcs 30 * - power management 31 * - codec GPIO 32 * - codec event notification 33 * Todo 34 * - Support for async sampling control for noisy LCDs. 35 * 36 */ 37 38 #include <linux/module.h> 39 #include <linux/moduleparam.h> 40 #include <linux/kernel.h> 41 #include <linux/init.h> 42 #include <linux/delay.h> 43 #include <linux/string.h> 44 #include <linux/proc_fs.h> 45 #include <linux/pm.h> 46 #include <linux/interrupt.h> 47 #include <linux/bitops.h> 48 #include <linux/workqueue.h> 49 #include <linux/wm97xx.h> 50 #include <linux/uaccess.h> 51 #include <linux/io.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) 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) 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, 375 IRQF_SHARED | IRQF_SAMPLE_RANDOM, 376 "wm97xx-pen", wm)) { 377 dev_err(wm->dev, 378 "Failed to register pen down interrupt, polling"); 379 wm->pen_irq = 0; 380 return -EINVAL; 381 } 382 383 /* Configure GPIO as interrupt source on WM971x */ 384 if (wm->id != WM9705_ID2) { 385 BUG_ON(!wm->mach_ops->irq_gpio); 386 reg = wm97xx_reg_read(wm, AC97_MISC_AFE); 387 wm97xx_reg_write(wm, AC97_MISC_AFE, 388 reg & ~(wm->mach_ops->irq_gpio)); 389 reg = wm97xx_reg_read(wm, 0x5a); 390 wm97xx_reg_write(wm, 0x5a, reg & ~0x0001); 391 } 392 393 return 0; 394 } 395 396 static int wm97xx_read_samples(struct wm97xx *wm) 397 { 398 struct wm97xx_data data; 399 int rc; 400 401 mutex_lock(&wm->codec_mutex); 402 403 if (wm->mach_ops && wm->mach_ops->acc_enabled) 404 rc = wm->mach_ops->acc_pen_down(wm); 405 else 406 rc = wm->codec->poll_touch(wm, &data); 407 408 if (rc & RC_PENUP) { 409 if (wm->pen_is_down) { 410 wm->pen_is_down = 0; 411 dev_dbg(wm->dev, "pen up\n"); 412 input_report_abs(wm->input_dev, ABS_PRESSURE, 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_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 set_bit(EV_ABS, wm->input_dev->evbit); 633 set_bit(ABS_X, wm->input_dev->absbit); 634 set_bit(ABS_Y, wm->input_dev->absbit); 635 set_bit(ABS_PRESSURE, wm->input_dev->absbit); 636 input_set_abs_params(wm->input_dev, ABS_X, abs_x[0], abs_x[1], 637 abs_x[2], 0); 638 input_set_abs_params(wm->input_dev, ABS_Y, abs_y[0], abs_y[1], 639 abs_y[2], 0); 640 input_set_abs_params(wm->input_dev, ABS_PRESSURE, abs_p[0], abs_p[1], 641 abs_p[2], 0); 642 input_set_drvdata(wm->input_dev, wm); 643 wm->input_dev->dev.parent = dev; 644 ret = input_register_device(wm->input_dev); 645 if (ret < 0) 646 goto dev_alloc_err; 647 648 /* register our battery device */ 649 wm->battery_dev = platform_device_alloc("wm97xx-battery", -1); 650 if (!wm->battery_dev) { 651 ret = -ENOMEM; 652 goto batt_err; 653 } 654 platform_set_drvdata(wm->battery_dev, wm); 655 wm->battery_dev->dev.parent = dev; 656 ret = platform_device_add(wm->battery_dev); 657 if (ret < 0) 658 goto batt_reg_err; 659 660 /* register our extended touch device (for machine specific 661 * extensions) */ 662 wm->touch_dev = platform_device_alloc("wm97xx-touch", -1); 663 if (!wm->touch_dev) { 664 ret = -ENOMEM; 665 goto touch_err; 666 } 667 platform_set_drvdata(wm->touch_dev, wm); 668 wm->touch_dev->dev.parent = dev; 669 ret = platform_device_add(wm->touch_dev); 670 if (ret < 0) 671 goto touch_reg_err; 672 673 return ret; 674 675 touch_reg_err: 676 platform_device_put(wm->touch_dev); 677 touch_err: 678 platform_device_unregister(wm->battery_dev); 679 wm->battery_dev = NULL; 680 batt_reg_err: 681 platform_device_put(wm->battery_dev); 682 batt_err: 683 input_unregister_device(wm->input_dev); 684 wm->input_dev = NULL; 685 dev_alloc_err: 686 input_free_device(wm->input_dev); 687 alloc_err: 688 kfree(wm); 689 690 return ret; 691 } 692 693 static int wm97xx_remove(struct device *dev) 694 { 695 struct wm97xx *wm = dev_get_drvdata(dev); 696 697 platform_device_unregister(wm->battery_dev); 698 platform_device_unregister(wm->touch_dev); 699 input_unregister_device(wm->input_dev); 700 kfree(wm); 701 702 return 0; 703 } 704 705 #ifdef CONFIG_PM 706 static int wm97xx_suspend(struct device *dev, pm_message_t state) 707 { 708 struct wm97xx *wm = dev_get_drvdata(dev); 709 u16 reg; 710 int suspend_mode; 711 712 if (device_may_wakeup(&wm->input_dev->dev)) 713 suspend_mode = wm->suspend_mode; 714 else 715 suspend_mode = 0; 716 717 if (wm->input_dev->users) 718 cancel_delayed_work_sync(&wm->ts_reader); 719 720 /* Power down the digitiser (bypassing the cache for resume) */ 721 reg = wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER2); 722 reg &= ~WM97XX_PRP_DET_DIG; 723 if (wm->input_dev->users) 724 reg |= suspend_mode; 725 wm->ac97->bus->ops->write(wm->ac97, AC97_WM97XX_DIGITISER2, reg); 726 727 /* WM9713 has an additional power bit - turn it off if there 728 * are no users or if suspend mode is zero. */ 729 if (wm->id == WM9713_ID2 && 730 (!wm->input_dev->users || !suspend_mode)) { 731 reg = wm97xx_reg_read(wm, AC97_EXTENDED_MID) | 0x8000; 732 wm97xx_reg_write(wm, AC97_EXTENDED_MID, reg); 733 } 734 735 return 0; 736 } 737 738 static int wm97xx_resume(struct device *dev) 739 { 740 struct wm97xx *wm = dev_get_drvdata(dev); 741 742 /* restore digitiser and gpios */ 743 if (wm->id == WM9713_ID2) { 744 wm97xx_reg_write(wm, AC97_WM9713_DIG1, wm->dig[0]); 745 wm97xx_reg_write(wm, 0x5a, wm->misc); 746 if (wm->input_dev->users) { 747 u16 reg; 748 reg = wm97xx_reg_read(wm, AC97_EXTENDED_MID) & 0x7fff; 749 wm97xx_reg_write(wm, AC97_EXTENDED_MID, reg); 750 } 751 } 752 753 wm97xx_reg_write(wm, AC97_WM9713_DIG2, wm->dig[1]); 754 wm97xx_reg_write(wm, AC97_WM9713_DIG3, wm->dig[2]); 755 756 wm97xx_reg_write(wm, AC97_GPIO_CFG, wm->gpio[0]); 757 wm97xx_reg_write(wm, AC97_GPIO_POLARITY, wm->gpio[1]); 758 wm97xx_reg_write(wm, AC97_GPIO_STICKY, wm->gpio[2]); 759 wm97xx_reg_write(wm, AC97_GPIO_WAKEUP, wm->gpio[3]); 760 wm97xx_reg_write(wm, AC97_GPIO_STATUS, wm->gpio[4]); 761 wm97xx_reg_write(wm, AC97_MISC_AFE, wm->gpio[5]); 762 763 if (wm->input_dev->users && !wm->pen_irq) { 764 wm->ts_reader_interval = wm->ts_reader_min_interval; 765 queue_delayed_work(wm->ts_workq, &wm->ts_reader, 766 wm->ts_reader_interval); 767 } 768 769 return 0; 770 } 771 772 #else 773 #define wm97xx_suspend NULL 774 #define wm97xx_resume NULL 775 #endif 776 777 /* 778 * Machine specific operations 779 */ 780 int wm97xx_register_mach_ops(struct wm97xx *wm, 781 struct wm97xx_mach_ops *mach_ops) 782 { 783 mutex_lock(&wm->codec_mutex); 784 if (wm->mach_ops) { 785 mutex_unlock(&wm->codec_mutex); 786 return -EINVAL; 787 } 788 wm->mach_ops = mach_ops; 789 mutex_unlock(&wm->codec_mutex); 790 791 return 0; 792 } 793 EXPORT_SYMBOL_GPL(wm97xx_register_mach_ops); 794 795 void wm97xx_unregister_mach_ops(struct wm97xx *wm) 796 { 797 mutex_lock(&wm->codec_mutex); 798 wm->mach_ops = NULL; 799 mutex_unlock(&wm->codec_mutex); 800 } 801 EXPORT_SYMBOL_GPL(wm97xx_unregister_mach_ops); 802 803 static struct device_driver wm97xx_driver = { 804 .name = "wm97xx-ts", 805 .bus = &ac97_bus_type, 806 .owner = THIS_MODULE, 807 .probe = wm97xx_probe, 808 .remove = wm97xx_remove, 809 .suspend = wm97xx_suspend, 810 .resume = wm97xx_resume, 811 }; 812 813 static int __init wm97xx_init(void) 814 { 815 return driver_register(&wm97xx_driver); 816 } 817 818 static void __exit wm97xx_exit(void) 819 { 820 driver_unregister(&wm97xx_driver); 821 } 822 823 module_init(wm97xx_init); 824 module_exit(wm97xx_exit); 825 826 /* Module information */ 827 MODULE_AUTHOR("Liam Girdwood <liam.girdwood@wolfsonmicro.com>"); 828 MODULE_DESCRIPTION("WM97xx Core - Touch Screen / AUX ADC / GPIO Driver"); 829 MODULE_LICENSE("GPL"); 830