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, 374 IRQF_SHARED | IRQF_SAMPLE_RANDOM, 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_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_sync(wm->input_dev); 437 wm->pen_is_down = 1; 438 wm->ts_reader_interval = wm->ts_reader_min_interval; 439 } else if (rc & RC_PENDOWN) { 440 dev_dbg(wm->dev, "pen down\n"); 441 wm->pen_is_down = 1; 442 wm->ts_reader_interval = wm->ts_reader_min_interval; 443 } 444 445 mutex_unlock(&wm->codec_mutex); 446 return rc; 447 } 448 449 /* 450 * The touchscreen sample reader. 451 */ 452 static void wm97xx_ts_reader(struct work_struct *work) 453 { 454 int rc; 455 struct wm97xx *wm = container_of(work, struct wm97xx, ts_reader.work); 456 457 BUG_ON(!wm->codec); 458 459 do { 460 rc = wm97xx_read_samples(wm); 461 } while (rc & RC_AGAIN); 462 463 if (wm->pen_is_down || !wm->pen_irq) 464 queue_delayed_work(wm->ts_workq, &wm->ts_reader, 465 wm->ts_reader_interval); 466 } 467 468 /** 469 * wm97xx_ts_input_open - Open the touch screen input device. 470 * @idev: Input device to be opened. 471 * 472 * Called by the input sub system to open a wm97xx touchscreen device. 473 * Starts the touchscreen thread and touch digitiser. 474 */ 475 static int wm97xx_ts_input_open(struct input_dev *idev) 476 { 477 struct wm97xx *wm = input_get_drvdata(idev); 478 479 wm->ts_workq = create_singlethread_workqueue("kwm97xx"); 480 if (wm->ts_workq == NULL) { 481 dev_err(wm->dev, 482 "Failed to create workqueue\n"); 483 return -EINVAL; 484 } 485 486 /* start digitiser */ 487 if (wm->mach_ops && wm->mach_ops->acc_enabled) 488 wm->codec->acc_enable(wm, 1); 489 wm->codec->dig_enable(wm, 1); 490 491 INIT_DELAYED_WORK(&wm->ts_reader, wm97xx_ts_reader); 492 INIT_WORK(&wm->pen_event_work, wm97xx_pen_irq_worker); 493 494 wm->ts_reader_min_interval = HZ >= 100 ? HZ / 100 : 1; 495 if (wm->ts_reader_min_interval < 1) 496 wm->ts_reader_min_interval = 1; 497 wm->ts_reader_interval = wm->ts_reader_min_interval; 498 499 wm->pen_is_down = 0; 500 if (wm->pen_irq) 501 wm97xx_init_pen_irq(wm); 502 else 503 dev_err(wm->dev, "No IRQ specified\n"); 504 505 /* If we either don't have an interrupt for pen down events or 506 * failed to acquire it then we need to poll. 507 */ 508 if (wm->pen_irq == 0) 509 queue_delayed_work(wm->ts_workq, &wm->ts_reader, 510 wm->ts_reader_interval); 511 512 return 0; 513 } 514 515 /** 516 * wm97xx_ts_input_close - Close the touch screen input device. 517 * @idev: Input device to be closed. 518 * 519 * Called by the input sub system to close a wm97xx touchscreen 520 * device. Kills the touchscreen thread and stops the touch 521 * digitiser. 522 */ 523 524 static void wm97xx_ts_input_close(struct input_dev *idev) 525 { 526 struct wm97xx *wm = input_get_drvdata(idev); 527 u16 reg; 528 529 if (wm->pen_irq) { 530 /* Return the interrupt to GPIO usage (disabling it) */ 531 if (wm->id != WM9705_ID2) { 532 BUG_ON(!wm->mach_ops->irq_gpio); 533 reg = wm97xx_reg_read(wm, AC97_MISC_AFE); 534 wm97xx_reg_write(wm, AC97_MISC_AFE, 535 reg | wm->mach_ops->irq_gpio); 536 } 537 538 free_irq(wm->pen_irq, wm); 539 } 540 541 wm->pen_is_down = 0; 542 543 /* Balance out interrupt disables/enables */ 544 if (cancel_work_sync(&wm->pen_event_work)) 545 wm->mach_ops->irq_enable(wm, 1); 546 547 /* ts_reader rearms itself so we need to explicitly stop it 548 * before we destroy the workqueue. 549 */ 550 cancel_delayed_work_sync(&wm->ts_reader); 551 552 destroy_workqueue(wm->ts_workq); 553 554 /* stop digitiser */ 555 wm->codec->dig_enable(wm, 0); 556 if (wm->mach_ops && wm->mach_ops->acc_enabled) 557 wm->codec->acc_enable(wm, 0); 558 } 559 560 static int wm97xx_probe(struct device *dev) 561 { 562 struct wm97xx *wm; 563 int ret = 0, id = 0; 564 565 wm = kzalloc(sizeof(struct wm97xx), GFP_KERNEL); 566 if (!wm) 567 return -ENOMEM; 568 mutex_init(&wm->codec_mutex); 569 570 wm->dev = dev; 571 dev->driver_data = wm; 572 wm->ac97 = to_ac97_t(dev); 573 574 /* check that we have a supported codec */ 575 id = wm97xx_reg_read(wm, AC97_VENDOR_ID1); 576 if (id != WM97XX_ID1) { 577 dev_err(dev, "Device with vendor %04x is not a wm97xx\n", id); 578 ret = -ENODEV; 579 goto alloc_err; 580 } 581 582 wm->id = wm97xx_reg_read(wm, AC97_VENDOR_ID2); 583 584 dev_info(wm->dev, "detected a wm97%02x codec\n", wm->id & 0xff); 585 586 switch (wm->id & 0xff) { 587 #ifdef CONFIG_TOUCHSCREEN_WM9705 588 case 0x05: 589 wm->codec = &wm9705_codec; 590 break; 591 #endif 592 #ifdef CONFIG_TOUCHSCREEN_WM9712 593 case 0x12: 594 wm->codec = &wm9712_codec; 595 break; 596 #endif 597 #ifdef CONFIG_TOUCHSCREEN_WM9713 598 case 0x13: 599 wm->codec = &wm9713_codec; 600 break; 601 #endif 602 default: 603 dev_err(wm->dev, "Support for wm97%02x not compiled in.\n", 604 wm->id & 0xff); 605 ret = -ENODEV; 606 goto alloc_err; 607 } 608 609 /* set up physical characteristics */ 610 wm->codec->phy_init(wm); 611 612 /* load gpio cache */ 613 wm->gpio[0] = wm97xx_reg_read(wm, AC97_GPIO_CFG); 614 wm->gpio[1] = wm97xx_reg_read(wm, AC97_GPIO_POLARITY); 615 wm->gpio[2] = wm97xx_reg_read(wm, AC97_GPIO_STICKY); 616 wm->gpio[3] = wm97xx_reg_read(wm, AC97_GPIO_WAKEUP); 617 wm->gpio[4] = wm97xx_reg_read(wm, AC97_GPIO_STATUS); 618 wm->gpio[5] = wm97xx_reg_read(wm, AC97_MISC_AFE); 619 620 wm->input_dev = input_allocate_device(); 621 if (wm->input_dev == NULL) { 622 ret = -ENOMEM; 623 goto alloc_err; 624 } 625 626 /* set up touch configuration */ 627 wm->input_dev->name = "wm97xx touchscreen"; 628 wm->input_dev->phys = "wm97xx"; 629 wm->input_dev->open = wm97xx_ts_input_open; 630 wm->input_dev->close = wm97xx_ts_input_close; 631 set_bit(EV_ABS, wm->input_dev->evbit); 632 set_bit(ABS_X, wm->input_dev->absbit); 633 set_bit(ABS_Y, wm->input_dev->absbit); 634 set_bit(ABS_PRESSURE, wm->input_dev->absbit); 635 input_set_abs_params(wm->input_dev, ABS_X, abs_x[0], abs_x[1], 636 abs_x[2], 0); 637 input_set_abs_params(wm->input_dev, ABS_Y, abs_y[0], abs_y[1], 638 abs_y[2], 0); 639 input_set_abs_params(wm->input_dev, ABS_PRESSURE, abs_p[0], abs_p[1], 640 abs_p[2], 0); 641 input_set_drvdata(wm->input_dev, wm); 642 wm->input_dev->dev.parent = dev; 643 ret = input_register_device(wm->input_dev); 644 if (ret < 0) 645 goto dev_alloc_err; 646 647 /* register our battery device */ 648 wm->battery_dev = platform_device_alloc("wm97xx-battery", -1); 649 if (!wm->battery_dev) { 650 ret = -ENOMEM; 651 goto batt_err; 652 } 653 platform_set_drvdata(wm->battery_dev, wm); 654 wm->battery_dev->dev.parent = dev; 655 ret = platform_device_add(wm->battery_dev); 656 if (ret < 0) 657 goto batt_reg_err; 658 659 /* register our extended touch device (for machine specific 660 * extensions) */ 661 wm->touch_dev = platform_device_alloc("wm97xx-touch", -1); 662 if (!wm->touch_dev) { 663 ret = -ENOMEM; 664 goto touch_err; 665 } 666 platform_set_drvdata(wm->touch_dev, wm); 667 wm->touch_dev->dev.parent = dev; 668 ret = platform_device_add(wm->touch_dev); 669 if (ret < 0) 670 goto touch_reg_err; 671 672 return ret; 673 674 touch_reg_err: 675 platform_device_put(wm->touch_dev); 676 touch_err: 677 platform_device_unregister(wm->battery_dev); 678 wm->battery_dev = NULL; 679 batt_reg_err: 680 platform_device_put(wm->battery_dev); 681 batt_err: 682 input_unregister_device(wm->input_dev); 683 wm->input_dev = NULL; 684 dev_alloc_err: 685 input_free_device(wm->input_dev); 686 alloc_err: 687 kfree(wm); 688 689 return ret; 690 } 691 692 static int wm97xx_remove(struct device *dev) 693 { 694 struct wm97xx *wm = dev_get_drvdata(dev); 695 696 platform_device_unregister(wm->battery_dev); 697 platform_device_unregister(wm->touch_dev); 698 input_unregister_device(wm->input_dev); 699 kfree(wm); 700 701 return 0; 702 } 703 704 #ifdef CONFIG_PM 705 static int wm97xx_suspend(struct device *dev, pm_message_t state) 706 { 707 struct wm97xx *wm = dev_get_drvdata(dev); 708 u16 reg; 709 int suspend_mode; 710 711 if (device_may_wakeup(&wm->input_dev->dev)) 712 suspend_mode = wm->suspend_mode; 713 else 714 suspend_mode = 0; 715 716 if (wm->input_dev->users) 717 cancel_delayed_work_sync(&wm->ts_reader); 718 719 /* Power down the digitiser (bypassing the cache for resume) */ 720 reg = wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER2); 721 reg &= ~WM97XX_PRP_DET_DIG; 722 if (wm->input_dev->users) 723 reg |= suspend_mode; 724 wm->ac97->bus->ops->write(wm->ac97, AC97_WM97XX_DIGITISER2, reg); 725 726 /* WM9713 has an additional power bit - turn it off if there 727 * are no users or if suspend mode is zero. */ 728 if (wm->id == WM9713_ID2 && 729 (!wm->input_dev->users || !suspend_mode)) { 730 reg = wm97xx_reg_read(wm, AC97_EXTENDED_MID) | 0x8000; 731 wm97xx_reg_write(wm, AC97_EXTENDED_MID, reg); 732 } 733 734 return 0; 735 } 736 737 static int wm97xx_resume(struct device *dev) 738 { 739 struct wm97xx *wm = dev_get_drvdata(dev); 740 741 /* restore digitiser and gpios */ 742 if (wm->id == WM9713_ID2) { 743 wm97xx_reg_write(wm, AC97_WM9713_DIG1, wm->dig[0]); 744 wm97xx_reg_write(wm, 0x5a, wm->misc); 745 if (wm->input_dev->users) { 746 u16 reg; 747 reg = wm97xx_reg_read(wm, AC97_EXTENDED_MID) & 0x7fff; 748 wm97xx_reg_write(wm, AC97_EXTENDED_MID, reg); 749 } 750 } 751 752 wm97xx_reg_write(wm, AC97_WM9713_DIG2, wm->dig[1]); 753 wm97xx_reg_write(wm, AC97_WM9713_DIG3, wm->dig[2]); 754 755 wm97xx_reg_write(wm, AC97_GPIO_CFG, wm->gpio[0]); 756 wm97xx_reg_write(wm, AC97_GPIO_POLARITY, wm->gpio[1]); 757 wm97xx_reg_write(wm, AC97_GPIO_STICKY, wm->gpio[2]); 758 wm97xx_reg_write(wm, AC97_GPIO_WAKEUP, wm->gpio[3]); 759 wm97xx_reg_write(wm, AC97_GPIO_STATUS, wm->gpio[4]); 760 wm97xx_reg_write(wm, AC97_MISC_AFE, wm->gpio[5]); 761 762 if (wm->input_dev->users && !wm->pen_irq) { 763 wm->ts_reader_interval = wm->ts_reader_min_interval; 764 queue_delayed_work(wm->ts_workq, &wm->ts_reader, 765 wm->ts_reader_interval); 766 } 767 768 return 0; 769 } 770 771 #else 772 #define wm97xx_suspend NULL 773 #define wm97xx_resume NULL 774 #endif 775 776 /* 777 * Machine specific operations 778 */ 779 int wm97xx_register_mach_ops(struct wm97xx *wm, 780 struct wm97xx_mach_ops *mach_ops) 781 { 782 mutex_lock(&wm->codec_mutex); 783 if (wm->mach_ops) { 784 mutex_unlock(&wm->codec_mutex); 785 return -EINVAL; 786 } 787 wm->mach_ops = mach_ops; 788 mutex_unlock(&wm->codec_mutex); 789 790 return 0; 791 } 792 EXPORT_SYMBOL_GPL(wm97xx_register_mach_ops); 793 794 void wm97xx_unregister_mach_ops(struct wm97xx *wm) 795 { 796 mutex_lock(&wm->codec_mutex); 797 wm->mach_ops = NULL; 798 mutex_unlock(&wm->codec_mutex); 799 } 800 EXPORT_SYMBOL_GPL(wm97xx_unregister_mach_ops); 801 802 static struct device_driver wm97xx_driver = { 803 .name = "wm97xx-ts", 804 .bus = &ac97_bus_type, 805 .owner = THIS_MODULE, 806 .probe = wm97xx_probe, 807 .remove = wm97xx_remove, 808 .suspend = wm97xx_suspend, 809 .resume = wm97xx_resume, 810 }; 811 812 static int __init wm97xx_init(void) 813 { 814 return driver_register(&wm97xx_driver); 815 } 816 817 static void __exit wm97xx_exit(void) 818 { 819 driver_unregister(&wm97xx_driver); 820 } 821 822 module_init(wm97xx_init); 823 module_exit(wm97xx_exit); 824 825 /* Module information */ 826 MODULE_AUTHOR("Liam Girdwood <lrg@slimlogic.co.uk>"); 827 MODULE_DESCRIPTION("WM97xx Core - Touch Screen / AUX ADC / GPIO Driver"); 828 MODULE_LICENSE("GPL"); 829