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/version.h> 41 #include <linux/kernel.h> 42 #include <linux/init.h> 43 #include <linux/delay.h> 44 #include <linux/string.h> 45 #include <linux/proc_fs.h> 46 #include <linux/pm.h> 47 #include <linux/interrupt.h> 48 #include <linux/bitops.h> 49 #include <linux/workqueue.h> 50 #include <linux/wm97xx.h> 51 #include <linux/uaccess.h> 52 #include <linux/io.h> 53 54 #define TS_NAME "wm97xx" 55 #define WM_CORE_VERSION "1.00" 56 #define DEFAULT_PRESSURE 0xb0c0 57 58 59 /* 60 * Touchscreen absolute values 61 * 62 * These parameters are used to help the input layer discard out of 63 * range readings and reduce jitter etc. 64 * 65 * o min, max:- indicate the min and max values your touch screen returns 66 * o fuzz:- use a higher number to reduce jitter 67 * 68 * The default values correspond to Mainstone II in QVGA mode 69 * 70 * Please read 71 * Documentation/input/input-programming.txt for more details. 72 */ 73 74 static int abs_x[3] = {350, 3900, 5}; 75 module_param_array(abs_x, int, NULL, 0); 76 MODULE_PARM_DESC(abs_x, "Touchscreen absolute X min, max, fuzz"); 77 78 static int abs_y[3] = {320, 3750, 40}; 79 module_param_array(abs_y, int, NULL, 0); 80 MODULE_PARM_DESC(abs_y, "Touchscreen absolute Y min, max, fuzz"); 81 82 static int abs_p[3] = {0, 150, 4}; 83 module_param_array(abs_p, int, NULL, 0); 84 MODULE_PARM_DESC(abs_p, "Touchscreen absolute Pressure min, max, fuzz"); 85 86 /* 87 * wm97xx IO access, all IO locking done by AC97 layer 88 */ 89 int wm97xx_reg_read(struct wm97xx *wm, u16 reg) 90 { 91 if (wm->ac97) 92 return wm->ac97->bus->ops->read(wm->ac97, reg); 93 else 94 return -1; 95 } 96 EXPORT_SYMBOL_GPL(wm97xx_reg_read); 97 98 void wm97xx_reg_write(struct wm97xx *wm, u16 reg, u16 val) 99 { 100 /* cache digitiser registers */ 101 if (reg >= AC97_WM9713_DIG1 && reg <= AC97_WM9713_DIG3) 102 wm->dig[(reg - AC97_WM9713_DIG1) >> 1] = val; 103 104 /* cache gpio regs */ 105 if (reg >= AC97_GPIO_CFG && reg <= AC97_MISC_AFE) 106 wm->gpio[(reg - AC97_GPIO_CFG) >> 1] = val; 107 108 /* wm9713 irq reg */ 109 if (reg == 0x5a) 110 wm->misc = val; 111 112 if (wm->ac97) 113 wm->ac97->bus->ops->write(wm->ac97, reg, val); 114 } 115 EXPORT_SYMBOL_GPL(wm97xx_reg_write); 116 117 /** 118 * wm97xx_read_aux_adc - Read the aux adc. 119 * @wm: wm97xx device. 120 * @adcsel: codec ADC to be read 121 * 122 * Reads the selected AUX ADC. 123 */ 124 125 int wm97xx_read_aux_adc(struct wm97xx *wm, u16 adcsel) 126 { 127 int power_adc = 0, auxval; 128 u16 power = 0; 129 130 /* get codec */ 131 mutex_lock(&wm->codec_mutex); 132 133 /* When the touchscreen is not in use, we may have to power up 134 * the AUX ADC before we can use sample the AUX inputs-> 135 */ 136 if (wm->id == WM9713_ID2 && 137 (power = wm97xx_reg_read(wm, AC97_EXTENDED_MID)) & 0x8000) { 138 power_adc = 1; 139 wm97xx_reg_write(wm, AC97_EXTENDED_MID, power & 0x7fff); 140 } 141 142 /* Prepare the codec for AUX reading */ 143 wm->codec->aux_prepare(wm); 144 145 /* Turn polling mode on to read AUX ADC */ 146 wm->pen_probably_down = 1; 147 wm->codec->poll_sample(wm, adcsel, &auxval); 148 149 if (power_adc) 150 wm97xx_reg_write(wm, AC97_EXTENDED_MID, power | 0x8000); 151 152 wm->codec->dig_restore(wm); 153 154 wm->pen_probably_down = 0; 155 156 mutex_unlock(&wm->codec_mutex); 157 return auxval & 0xfff; 158 } 159 EXPORT_SYMBOL_GPL(wm97xx_read_aux_adc); 160 161 /** 162 * wm97xx_get_gpio - Get the status of a codec GPIO. 163 * @wm: wm97xx device. 164 * @gpio: gpio 165 * 166 * Get the status of a codec GPIO pin 167 */ 168 169 enum wm97xx_gpio_status wm97xx_get_gpio(struct wm97xx *wm, u32 gpio) 170 { 171 u16 status; 172 enum wm97xx_gpio_status ret; 173 174 mutex_lock(&wm->codec_mutex); 175 status = wm97xx_reg_read(wm, AC97_GPIO_STATUS); 176 177 if (status & gpio) 178 ret = WM97XX_GPIO_HIGH; 179 else 180 ret = WM97XX_GPIO_LOW; 181 182 mutex_unlock(&wm->codec_mutex); 183 return ret; 184 } 185 EXPORT_SYMBOL_GPL(wm97xx_get_gpio); 186 187 /** 188 * wm97xx_set_gpio - Set the status of a codec GPIO. 189 * @wm: wm97xx device. 190 * @gpio: gpio 191 * 192 * 193 * Set the status of a codec GPIO pin 194 */ 195 196 void wm97xx_set_gpio(struct wm97xx *wm, u32 gpio, 197 enum wm97xx_gpio_status status) 198 { 199 u16 reg; 200 201 mutex_lock(&wm->codec_mutex); 202 reg = wm97xx_reg_read(wm, AC97_GPIO_STATUS); 203 204 if (status & WM97XX_GPIO_HIGH) 205 reg |= gpio; 206 else 207 reg &= ~gpio; 208 209 if (wm->id == WM9712_ID2) 210 wm97xx_reg_write(wm, AC97_GPIO_STATUS, reg << 1); 211 else 212 wm97xx_reg_write(wm, AC97_GPIO_STATUS, reg); 213 mutex_unlock(&wm->codec_mutex); 214 } 215 EXPORT_SYMBOL_GPL(wm97xx_set_gpio); 216 217 /* 218 * Codec GPIO pin configuration, this sets pin direction, polarity, 219 * stickyness and wake up. 220 */ 221 void wm97xx_config_gpio(struct wm97xx *wm, u32 gpio, enum wm97xx_gpio_dir dir, 222 enum wm97xx_gpio_pol pol, enum wm97xx_gpio_sticky sticky, 223 enum wm97xx_gpio_wake wake) 224 { 225 u16 reg; 226 227 mutex_lock(&wm->codec_mutex); 228 reg = wm97xx_reg_read(wm, AC97_GPIO_POLARITY); 229 230 if (pol == WM97XX_GPIO_POL_HIGH) 231 reg |= gpio; 232 else 233 reg &= ~gpio; 234 235 wm97xx_reg_write(wm, AC97_GPIO_POLARITY, reg); 236 reg = wm97xx_reg_read(wm, AC97_GPIO_STICKY); 237 238 if (sticky == WM97XX_GPIO_STICKY) 239 reg |= gpio; 240 else 241 reg &= ~gpio; 242 243 wm97xx_reg_write(wm, AC97_GPIO_STICKY, reg); 244 reg = wm97xx_reg_read(wm, AC97_GPIO_WAKEUP); 245 246 if (wake == WM97XX_GPIO_WAKE) 247 reg |= gpio; 248 else 249 reg &= ~gpio; 250 251 wm97xx_reg_write(wm, AC97_GPIO_WAKEUP, reg); 252 reg = wm97xx_reg_read(wm, AC97_GPIO_CFG); 253 254 if (dir == WM97XX_GPIO_IN) 255 reg |= gpio; 256 else 257 reg &= ~gpio; 258 259 wm97xx_reg_write(wm, AC97_GPIO_CFG, reg); 260 mutex_unlock(&wm->codec_mutex); 261 } 262 EXPORT_SYMBOL_GPL(wm97xx_config_gpio); 263 264 /* 265 * Configure the WM97XX_PRP value to use while system is suspended. 266 * If a value other than 0 is set then WM97xx pen detection will be 267 * left enabled in the configured mode while the system is in suspend, 268 * the device has users and suspend has not been disabled via the 269 * wakeup sysfs entries. 270 * 271 * @wm: WM97xx device to configure 272 * @mode: WM97XX_PRP value to configure while suspended 273 */ 274 void wm97xx_set_suspend_mode(struct wm97xx *wm, u16 mode) 275 { 276 wm->suspend_mode = mode; 277 device_init_wakeup(&wm->input_dev->dev, mode != 0); 278 } 279 EXPORT_SYMBOL_GPL(wm97xx_set_suspend_mode); 280 281 /* 282 * Handle a pen down interrupt. 283 */ 284 static void wm97xx_pen_irq_worker(struct work_struct *work) 285 { 286 struct wm97xx *wm = container_of(work, struct wm97xx, pen_event_work); 287 int pen_was_down = wm->pen_is_down; 288 289 /* do we need to enable the touch panel reader */ 290 if (wm->id == WM9705_ID2) { 291 if (wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER_RD) & 292 WM97XX_PEN_DOWN) 293 wm->pen_is_down = 1; 294 else 295 wm->pen_is_down = 0; 296 } else { 297 u16 status, pol; 298 mutex_lock(&wm->codec_mutex); 299 status = wm97xx_reg_read(wm, AC97_GPIO_STATUS); 300 pol = wm97xx_reg_read(wm, AC97_GPIO_POLARITY); 301 302 if (WM97XX_GPIO_13 & pol & status) { 303 wm->pen_is_down = 1; 304 wm97xx_reg_write(wm, AC97_GPIO_POLARITY, pol & 305 ~WM97XX_GPIO_13); 306 } else { 307 wm->pen_is_down = 0; 308 wm97xx_reg_write(wm, AC97_GPIO_POLARITY, pol | 309 WM97XX_GPIO_13); 310 } 311 312 if (wm->id == WM9712_ID2) 313 wm97xx_reg_write(wm, AC97_GPIO_STATUS, (status & 314 ~WM97XX_GPIO_13) << 1); 315 else 316 wm97xx_reg_write(wm, AC97_GPIO_STATUS, status & 317 ~WM97XX_GPIO_13); 318 mutex_unlock(&wm->codec_mutex); 319 } 320 321 /* If the system is not using continuous mode or it provides a 322 * pen down operation then we need to schedule polls while the 323 * pen is down. Otherwise the machine driver is responsible 324 * for scheduling reads. 325 */ 326 if (!wm->mach_ops->acc_enabled || wm->mach_ops->acc_pen_down) { 327 if (wm->pen_is_down && !pen_was_down) { 328 /* Data is not availiable immediately on pen down */ 329 queue_delayed_work(wm->ts_workq, &wm->ts_reader, 1); 330 } 331 332 /* Let ts_reader report the pen up for debounce. */ 333 if (!wm->pen_is_down && pen_was_down) 334 wm->pen_is_down = 1; 335 } 336 337 if (!wm->pen_is_down && wm->mach_ops->acc_enabled) 338 wm->mach_ops->acc_pen_up(wm); 339 340 wm->mach_ops->irq_enable(wm, 1); 341 } 342 343 /* 344 * Codec PENDOWN irq handler 345 * 346 * We have to disable the codec interrupt in the handler because it 347 * can take upto 1ms to clear the interrupt source. We schedule a task 348 * in a work queue to do the actual interaction with the chip. The 349 * interrupt is then enabled again in the slow handler when the source 350 * has been cleared. 351 */ 352 static irqreturn_t wm97xx_pen_interrupt(int irq, void *dev_id) 353 { 354 struct wm97xx *wm = dev_id; 355 356 if (!work_pending(&wm->pen_event_work)) { 357 wm->mach_ops->irq_enable(wm, 0); 358 queue_work(wm->ts_workq, &wm->pen_event_work); 359 } 360 361 return IRQ_HANDLED; 362 } 363 364 /* 365 * initialise pen IRQ handler and workqueue 366 */ 367 static int wm97xx_init_pen_irq(struct wm97xx *wm) 368 { 369 u16 reg; 370 371 /* If an interrupt is supplied an IRQ enable operation must also be 372 * provided. */ 373 BUG_ON(!wm->mach_ops->irq_enable); 374 375 if (request_irq(wm->pen_irq, wm97xx_pen_interrupt, 376 IRQF_SHARED | IRQF_SAMPLE_RANDOM, 377 "wm97xx-pen", wm)) { 378 dev_err(wm->dev, 379 "Failed to register pen down interrupt, polling"); 380 wm->pen_irq = 0; 381 return -EINVAL; 382 } 383 384 /* Configure GPIO as interrupt source on WM971x */ 385 if (wm->id != WM9705_ID2) { 386 BUG_ON(!wm->mach_ops->irq_gpio); 387 reg = wm97xx_reg_read(wm, AC97_MISC_AFE); 388 wm97xx_reg_write(wm, AC97_MISC_AFE, 389 reg & ~(wm->mach_ops->irq_gpio)); 390 reg = wm97xx_reg_read(wm, 0x5a); 391 wm97xx_reg_write(wm, 0x5a, reg & ~0x0001); 392 } 393 394 return 0; 395 } 396 397 static int wm97xx_read_samples(struct wm97xx *wm) 398 { 399 struct wm97xx_data data; 400 int rc; 401 402 mutex_lock(&wm->codec_mutex); 403 404 if (wm->mach_ops && wm->mach_ops->acc_enabled) 405 rc = wm->mach_ops->acc_pen_down(wm); 406 else 407 rc = wm->codec->poll_touch(wm, &data); 408 409 if (rc & RC_PENUP) { 410 if (wm->pen_is_down) { 411 wm->pen_is_down = 0; 412 dev_dbg(wm->dev, "pen up\n"); 413 input_report_abs(wm->input_dev, ABS_PRESSURE, 0); 414 input_sync(wm->input_dev); 415 } else if (!(rc & RC_AGAIN)) { 416 /* We need high frequency updates only while 417 * pen is down, the user never will be able to 418 * touch screen faster than a few times per 419 * second... On the other hand, when the user 420 * is actively working with the touchscreen we 421 * don't want to lose the quick response. So we 422 * will slowly increase sleep time after the 423 * pen is up and quicky restore it to ~one task 424 * switch when pen is down again. 425 */ 426 if (wm->ts_reader_interval < HZ / 10) 427 wm->ts_reader_interval++; 428 } 429 430 } else if (rc & RC_VALID) { 431 dev_dbg(wm->dev, 432 "pen down: x=%x:%d, y=%x:%d, pressure=%x:%d\n", 433 data.x >> 12, data.x & 0xfff, data.y >> 12, 434 data.y & 0xfff, data.p >> 12, data.p & 0xfff); 435 input_report_abs(wm->input_dev, ABS_X, data.x & 0xfff); 436 input_report_abs(wm->input_dev, ABS_Y, data.y & 0xfff); 437 input_report_abs(wm->input_dev, ABS_PRESSURE, data.p & 0xfff); 438 input_sync(wm->input_dev); 439 wm->pen_is_down = 1; 440 wm->ts_reader_interval = wm->ts_reader_min_interval; 441 } else if (rc & RC_PENDOWN) { 442 dev_dbg(wm->dev, "pen down\n"); 443 wm->pen_is_down = 1; 444 wm->ts_reader_interval = wm->ts_reader_min_interval; 445 } 446 447 mutex_unlock(&wm->codec_mutex); 448 return rc; 449 } 450 451 /* 452 * The touchscreen sample reader. 453 */ 454 static void wm97xx_ts_reader(struct work_struct *work) 455 { 456 int rc; 457 struct wm97xx *wm = container_of(work, struct wm97xx, ts_reader.work); 458 459 BUG_ON(!wm->codec); 460 461 do { 462 rc = wm97xx_read_samples(wm); 463 } while (rc & RC_AGAIN); 464 465 if (wm->pen_is_down || !wm->pen_irq) 466 queue_delayed_work(wm->ts_workq, &wm->ts_reader, 467 wm->ts_reader_interval); 468 } 469 470 /** 471 * wm97xx_ts_input_open - Open the touch screen input device. 472 * @idev: Input device to be opened. 473 * 474 * Called by the input sub system to open a wm97xx touchscreen device. 475 * Starts the touchscreen thread and touch digitiser. 476 */ 477 static int wm97xx_ts_input_open(struct input_dev *idev) 478 { 479 struct wm97xx *wm = input_get_drvdata(idev); 480 481 wm->ts_workq = create_singlethread_workqueue("kwm97xx"); 482 if (wm->ts_workq == NULL) { 483 dev_err(wm->dev, 484 "Failed to create workqueue\n"); 485 return -EINVAL; 486 } 487 488 /* start digitiser */ 489 if (wm->mach_ops && wm->mach_ops->acc_enabled) 490 wm->codec->acc_enable(wm, 1); 491 wm->codec->dig_enable(wm, 1); 492 493 INIT_DELAYED_WORK(&wm->ts_reader, wm97xx_ts_reader); 494 INIT_WORK(&wm->pen_event_work, wm97xx_pen_irq_worker); 495 496 wm->ts_reader_min_interval = HZ >= 100 ? HZ / 100 : 1; 497 if (wm->ts_reader_min_interval < 1) 498 wm->ts_reader_min_interval = 1; 499 wm->ts_reader_interval = wm->ts_reader_min_interval; 500 501 wm->pen_is_down = 0; 502 if (wm->pen_irq) 503 wm97xx_init_pen_irq(wm); 504 else 505 dev_err(wm->dev, "No IRQ specified\n"); 506 507 /* If we either don't have an interrupt for pen down events or 508 * failed to acquire it then we need to poll. 509 */ 510 if (wm->pen_irq == 0) 511 queue_delayed_work(wm->ts_workq, &wm->ts_reader, 512 wm->ts_reader_interval); 513 514 return 0; 515 } 516 517 /** 518 * wm97xx_ts_input_close - Close the touch screen input device. 519 * @idev: Input device to be closed. 520 * 521 * Called by the input sub system to close a wm97xx touchscreen 522 * device. Kills the touchscreen thread and stops the touch 523 * digitiser. 524 */ 525 526 static void wm97xx_ts_input_close(struct input_dev *idev) 527 { 528 struct wm97xx *wm = input_get_drvdata(idev); 529 u16 reg; 530 531 if (wm->pen_irq) { 532 /* Return the interrupt to GPIO usage (disabling it) */ 533 if (wm->id != WM9705_ID2) { 534 BUG_ON(!wm->mach_ops->irq_gpio); 535 reg = wm97xx_reg_read(wm, AC97_MISC_AFE); 536 wm97xx_reg_write(wm, AC97_MISC_AFE, 537 reg | wm->mach_ops->irq_gpio); 538 } 539 540 free_irq(wm->pen_irq, wm); 541 } 542 543 wm->pen_is_down = 0; 544 545 /* Balance out interrupt disables/enables */ 546 if (cancel_work_sync(&wm->pen_event_work)) 547 wm->mach_ops->irq_enable(wm, 1); 548 549 /* ts_reader rearms itself so we need to explicitly stop it 550 * before we destroy the workqueue. 551 */ 552 cancel_delayed_work_sync(&wm->ts_reader); 553 554 destroy_workqueue(wm->ts_workq); 555 556 /* stop digitiser */ 557 wm->codec->dig_enable(wm, 0); 558 if (wm->mach_ops && wm->mach_ops->acc_enabled) 559 wm->codec->acc_enable(wm, 0); 560 } 561 562 static int wm97xx_probe(struct device *dev) 563 { 564 struct wm97xx *wm; 565 int ret = 0, id = 0; 566 567 wm = kzalloc(sizeof(struct wm97xx), GFP_KERNEL); 568 if (!wm) 569 return -ENOMEM; 570 mutex_init(&wm->codec_mutex); 571 572 wm->dev = dev; 573 dev->driver_data = wm; 574 wm->ac97 = to_ac97_t(dev); 575 576 /* check that we have a supported codec */ 577 id = wm97xx_reg_read(wm, AC97_VENDOR_ID1); 578 if (id != WM97XX_ID1) { 579 dev_err(dev, "Device with vendor %04x is not a wm97xx\n", id); 580 ret = -ENODEV; 581 goto alloc_err; 582 } 583 584 wm->id = wm97xx_reg_read(wm, AC97_VENDOR_ID2); 585 586 dev_info(wm->dev, "detected a wm97%02x codec\n", wm->id & 0xff); 587 588 switch (wm->id & 0xff) { 589 #ifdef CONFIG_TOUCHSCREEN_WM9705 590 case 0x05: 591 wm->codec = &wm9705_codec; 592 break; 593 #endif 594 #ifdef CONFIG_TOUCHSCREEN_WM9712 595 case 0x12: 596 wm->codec = &wm9712_codec; 597 break; 598 #endif 599 #ifdef CONFIG_TOUCHSCREEN_WM9713 600 case 0x13: 601 wm->codec = &wm9713_codec; 602 break; 603 #endif 604 default: 605 dev_err(wm->dev, "Support for wm97%02x not compiled in.\n", 606 wm->id & 0xff); 607 ret = -ENODEV; 608 goto alloc_err; 609 } 610 611 wm->input_dev = input_allocate_device(); 612 if (wm->input_dev == NULL) { 613 ret = -ENOMEM; 614 goto alloc_err; 615 } 616 617 /* set up touch configuration */ 618 wm->input_dev->name = "wm97xx touchscreen"; 619 wm->input_dev->open = wm97xx_ts_input_open; 620 wm->input_dev->close = wm97xx_ts_input_close; 621 set_bit(EV_ABS, wm->input_dev->evbit); 622 set_bit(ABS_X, wm->input_dev->absbit); 623 set_bit(ABS_Y, wm->input_dev->absbit); 624 set_bit(ABS_PRESSURE, wm->input_dev->absbit); 625 input_set_abs_params(wm->input_dev, ABS_X, abs_x[0], abs_x[1], 626 abs_x[2], 0); 627 input_set_abs_params(wm->input_dev, ABS_Y, abs_y[0], abs_y[1], 628 abs_y[2], 0); 629 input_set_abs_params(wm->input_dev, ABS_PRESSURE, abs_p[0], abs_p[1], 630 abs_p[2], 0); 631 input_set_drvdata(wm->input_dev, wm); 632 wm->input_dev->dev.parent = dev; 633 ret = input_register_device(wm->input_dev); 634 if (ret < 0) 635 goto dev_alloc_err; 636 637 /* set up physical characteristics */ 638 wm->codec->phy_init(wm); 639 640 /* load gpio cache */ 641 wm->gpio[0] = wm97xx_reg_read(wm, AC97_GPIO_CFG); 642 wm->gpio[1] = wm97xx_reg_read(wm, AC97_GPIO_POLARITY); 643 wm->gpio[2] = wm97xx_reg_read(wm, AC97_GPIO_STICKY); 644 wm->gpio[3] = wm97xx_reg_read(wm, AC97_GPIO_WAKEUP); 645 wm->gpio[4] = wm97xx_reg_read(wm, AC97_GPIO_STATUS); 646 wm->gpio[5] = wm97xx_reg_read(wm, AC97_MISC_AFE); 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 = "ac97", 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