1 /* 2 * wm97xx-core.c -- Touch screen driver core for Wolfson WM9705, WM9712 3 * and WM9713 AC97 Codecs. 4 * 5 * Copyright 2003, 2004, 2005, 2006, 2007, 2008 Wolfson Microelectronics PLC. 6 * Author: Liam Girdwood <lrg@slimlogic.co.uk> 7 * Parts Copyright : Ian Molton <spyro@f2s.com> 8 * Andrew Zabolotny <zap@homelink.ru> 9 * Russell King <rmk@arm.linux.org.uk> 10 * 11 * This program is free software; you can redistribute it and/or modify it 12 * under the terms of the GNU General Public License as published by the 13 * Free Software Foundation; either version 2 of the License, or (at your 14 * option) any later version. 15 * 16 * Notes: 17 * 18 * Features: 19 * - supports WM9705, WM9712, WM9713 20 * - polling mode 21 * - continuous mode (arch-dependent) 22 * - adjustable rpu/dpp settings 23 * - adjustable pressure current 24 * - adjustable sample settle delay 25 * - 4 and 5 wire touchscreens (5 wire is WM9712 only) 26 * - pen down detection 27 * - battery monitor 28 * - sample AUX adcs 29 * - power management 30 * - codec GPIO 31 * - codec event notification 32 * Todo 33 * - Support for async sampling control for noisy LCDs. 34 * 35 */ 36 37 #include <linux/module.h> 38 #include <linux/moduleparam.h> 39 #include <linux/kernel.h> 40 #include <linux/init.h> 41 #include <linux/delay.h> 42 #include <linux/string.h> 43 #include <linux/proc_fs.h> 44 #include <linux/pm.h> 45 #include <linux/interrupt.h> 46 #include <linux/bitops.h> 47 #include <linux/workqueue.h> 48 #include <linux/wm97xx.h> 49 #include <linux/uaccess.h> 50 #include <linux/io.h> 51 #include <linux/slab.h> 52 53 #define TS_NAME "wm97xx" 54 #define WM_CORE_VERSION "1.00" 55 #define DEFAULT_PRESSURE 0xb0c0 56 57 58 /* 59 * Touchscreen absolute values 60 * 61 * These parameters are used to help the input layer discard out of 62 * range readings and reduce jitter etc. 63 * 64 * o min, max:- indicate the min and max values your touch screen returns 65 * o fuzz:- use a higher number to reduce jitter 66 * 67 * The default values correspond to Mainstone II in QVGA mode 68 * 69 * Please read 70 * Documentation/input/input-programming.txt for more details. 71 */ 72 73 static int abs_x[3] = {150, 4000, 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] = {200, 4000, 40}; 78 module_param_array(abs_y, int, NULL, 0); 79 MODULE_PARM_DESC(abs_y, "Touchscreen absolute Y min, max, fuzz"); 80 81 static int abs_p[3] = {0, 150, 4}; 82 module_param_array(abs_p, int, NULL, 0); 83 MODULE_PARM_DESC(abs_p, "Touchscreen absolute Pressure min, max, fuzz"); 84 85 /* 86 * wm97xx IO access, all IO locking done by AC97 layer 87 */ 88 int wm97xx_reg_read(struct wm97xx *wm, u16 reg) 89 { 90 if (wm->ac97) 91 return wm->ac97->bus->ops->read(wm->ac97, reg); 92 else 93 return -1; 94 } 95 EXPORT_SYMBOL_GPL(wm97xx_reg_read); 96 97 void wm97xx_reg_write(struct wm97xx *wm, u16 reg, u16 val) 98 { 99 /* cache digitiser registers */ 100 if (reg >= AC97_WM9713_DIG1 && reg <= AC97_WM9713_DIG3) 101 wm->dig[(reg - AC97_WM9713_DIG1) >> 1] = val; 102 103 /* cache gpio regs */ 104 if (reg >= AC97_GPIO_CFG && reg <= AC97_MISC_AFE) 105 wm->gpio[(reg - AC97_GPIO_CFG) >> 1] = val; 106 107 /* wm9713 irq reg */ 108 if (reg == 0x5a) 109 wm->misc = val; 110 111 if (wm->ac97) 112 wm->ac97->bus->ops->write(wm->ac97, reg, val); 113 } 114 EXPORT_SYMBOL_GPL(wm97xx_reg_write); 115 116 /** 117 * wm97xx_read_aux_adc - Read the aux adc. 118 * @wm: wm97xx device. 119 * @adcsel: codec ADC to be read 120 * 121 * Reads the selected AUX ADC. 122 */ 123 124 int wm97xx_read_aux_adc(struct wm97xx *wm, u16 adcsel) 125 { 126 int power_adc = 0, auxval; 127 u16 power = 0; 128 int rc = 0; 129 int timeout = 0; 130 131 /* get codec */ 132 mutex_lock(&wm->codec_mutex); 133 134 /* When the touchscreen is not in use, we may have to power up 135 * the AUX ADC before we can use sample the AUX inputs-> 136 */ 137 if (wm->id == WM9713_ID2 && 138 (power = wm97xx_reg_read(wm, AC97_EXTENDED_MID)) & 0x8000) { 139 power_adc = 1; 140 wm97xx_reg_write(wm, AC97_EXTENDED_MID, power & 0x7fff); 141 } 142 143 /* Prepare the codec for AUX reading */ 144 wm->codec->aux_prepare(wm); 145 146 /* Turn polling mode on to read AUX ADC */ 147 wm->pen_probably_down = 1; 148 149 while (rc != RC_VALID && timeout++ < 5) 150 rc = wm->codec->poll_sample(wm, adcsel, &auxval); 151 152 if (power_adc) 153 wm97xx_reg_write(wm, AC97_EXTENDED_MID, power | 0x8000); 154 155 wm->codec->dig_restore(wm); 156 157 wm->pen_probably_down = 0; 158 159 if (timeout >= 5) { 160 dev_err(wm->dev, 161 "timeout reading auxadc %d, disabling digitiser\n", 162 adcsel); 163 wm->codec->dig_enable(wm, false); 164 } 165 166 mutex_unlock(&wm->codec_mutex); 167 return (rc == RC_VALID ? auxval & 0xfff : -EBUSY); 168 } 169 EXPORT_SYMBOL_GPL(wm97xx_read_aux_adc); 170 171 /** 172 * wm97xx_get_gpio - Get the status of a codec GPIO. 173 * @wm: wm97xx device. 174 * @gpio: gpio 175 * 176 * Get the status of a codec GPIO pin 177 */ 178 179 enum wm97xx_gpio_status wm97xx_get_gpio(struct wm97xx *wm, u32 gpio) 180 { 181 u16 status; 182 enum wm97xx_gpio_status ret; 183 184 mutex_lock(&wm->codec_mutex); 185 status = wm97xx_reg_read(wm, AC97_GPIO_STATUS); 186 187 if (status & gpio) 188 ret = WM97XX_GPIO_HIGH; 189 else 190 ret = WM97XX_GPIO_LOW; 191 192 mutex_unlock(&wm->codec_mutex); 193 return ret; 194 } 195 EXPORT_SYMBOL_GPL(wm97xx_get_gpio); 196 197 /** 198 * wm97xx_set_gpio - Set the status of a codec GPIO. 199 * @wm: wm97xx device. 200 * @gpio: gpio 201 * 202 * 203 * Set the status of a codec GPIO pin 204 */ 205 206 void wm97xx_set_gpio(struct wm97xx *wm, u32 gpio, 207 enum wm97xx_gpio_status status) 208 { 209 u16 reg; 210 211 mutex_lock(&wm->codec_mutex); 212 reg = wm97xx_reg_read(wm, AC97_GPIO_STATUS); 213 214 if (status == WM97XX_GPIO_HIGH) 215 reg |= gpio; 216 else 217 reg &= ~gpio; 218 219 if (wm->id == WM9712_ID2 && wm->variant != WM97xx_WM1613) 220 wm97xx_reg_write(wm, AC97_GPIO_STATUS, reg << 1); 221 else 222 wm97xx_reg_write(wm, AC97_GPIO_STATUS, reg); 223 mutex_unlock(&wm->codec_mutex); 224 } 225 EXPORT_SYMBOL_GPL(wm97xx_set_gpio); 226 227 /* 228 * Codec GPIO pin configuration, this sets pin direction, polarity, 229 * stickyness and wake up. 230 */ 231 void wm97xx_config_gpio(struct wm97xx *wm, u32 gpio, enum wm97xx_gpio_dir dir, 232 enum wm97xx_gpio_pol pol, enum wm97xx_gpio_sticky sticky, 233 enum wm97xx_gpio_wake wake) 234 { 235 u16 reg; 236 237 mutex_lock(&wm->codec_mutex); 238 reg = wm97xx_reg_read(wm, AC97_GPIO_POLARITY); 239 240 if (pol == WM97XX_GPIO_POL_HIGH) 241 reg |= gpio; 242 else 243 reg &= ~gpio; 244 245 wm97xx_reg_write(wm, AC97_GPIO_POLARITY, reg); 246 reg = wm97xx_reg_read(wm, AC97_GPIO_STICKY); 247 248 if (sticky == WM97XX_GPIO_STICKY) 249 reg |= gpio; 250 else 251 reg &= ~gpio; 252 253 wm97xx_reg_write(wm, AC97_GPIO_STICKY, reg); 254 reg = wm97xx_reg_read(wm, AC97_GPIO_WAKEUP); 255 256 if (wake == WM97XX_GPIO_WAKE) 257 reg |= gpio; 258 else 259 reg &= ~gpio; 260 261 wm97xx_reg_write(wm, AC97_GPIO_WAKEUP, reg); 262 reg = wm97xx_reg_read(wm, AC97_GPIO_CFG); 263 264 if (dir == WM97XX_GPIO_IN) 265 reg |= gpio; 266 else 267 reg &= ~gpio; 268 269 wm97xx_reg_write(wm, AC97_GPIO_CFG, reg); 270 mutex_unlock(&wm->codec_mutex); 271 } 272 EXPORT_SYMBOL_GPL(wm97xx_config_gpio); 273 274 /* 275 * Configure the WM97XX_PRP value to use while system is suspended. 276 * If a value other than 0 is set then WM97xx pen detection will be 277 * left enabled in the configured mode while the system is in suspend, 278 * the device has users and suspend has not been disabled via the 279 * wakeup sysfs entries. 280 * 281 * @wm: WM97xx device to configure 282 * @mode: WM97XX_PRP value to configure while suspended 283 */ 284 void wm97xx_set_suspend_mode(struct wm97xx *wm, u16 mode) 285 { 286 wm->suspend_mode = mode; 287 device_init_wakeup(&wm->input_dev->dev, mode != 0); 288 } 289 EXPORT_SYMBOL_GPL(wm97xx_set_suspend_mode); 290 291 /* 292 * Handle a pen down interrupt. 293 */ 294 static void wm97xx_pen_irq_worker(struct work_struct *work) 295 { 296 struct wm97xx *wm = container_of(work, struct wm97xx, pen_event_work); 297 int pen_was_down = wm->pen_is_down; 298 299 /* do we need to enable the touch panel reader */ 300 if (wm->id == WM9705_ID2) { 301 if (wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER_RD) & 302 WM97XX_PEN_DOWN) 303 wm->pen_is_down = 1; 304 else 305 wm->pen_is_down = 0; 306 } else { 307 u16 status, pol; 308 mutex_lock(&wm->codec_mutex); 309 status = wm97xx_reg_read(wm, AC97_GPIO_STATUS); 310 pol = wm97xx_reg_read(wm, AC97_GPIO_POLARITY); 311 312 if (WM97XX_GPIO_13 & pol & status) { 313 wm->pen_is_down = 1; 314 wm97xx_reg_write(wm, AC97_GPIO_POLARITY, pol & 315 ~WM97XX_GPIO_13); 316 } else { 317 wm->pen_is_down = 0; 318 wm97xx_reg_write(wm, AC97_GPIO_POLARITY, pol | 319 WM97XX_GPIO_13); 320 } 321 322 if (wm->id == WM9712_ID2 && wm->variant != WM97xx_WM1613) 323 wm97xx_reg_write(wm, AC97_GPIO_STATUS, (status & 324 ~WM97XX_GPIO_13) << 1); 325 else 326 wm97xx_reg_write(wm, AC97_GPIO_STATUS, status & 327 ~WM97XX_GPIO_13); 328 mutex_unlock(&wm->codec_mutex); 329 } 330 331 /* If the system is not using continuous mode or it provides a 332 * pen down operation then we need to schedule polls while the 333 * pen is down. Otherwise the machine driver is responsible 334 * for scheduling reads. 335 */ 336 if (!wm->mach_ops->acc_enabled || wm->mach_ops->acc_pen_down) { 337 if (wm->pen_is_down && !pen_was_down) { 338 /* Data is not available immediately on pen down */ 339 queue_delayed_work(wm->ts_workq, &wm->ts_reader, 1); 340 } 341 342 /* Let ts_reader report the pen up for debounce. */ 343 if (!wm->pen_is_down && pen_was_down) 344 wm->pen_is_down = 1; 345 } 346 347 if (!wm->pen_is_down && wm->mach_ops->acc_enabled) 348 wm->mach_ops->acc_pen_up(wm); 349 350 wm->mach_ops->irq_enable(wm, 1); 351 } 352 353 /* 354 * Codec PENDOWN irq handler 355 * 356 * We have to disable the codec interrupt in the handler because it 357 * can take up to 1ms to clear the interrupt source. We schedule a task 358 * in a work queue to do the actual interaction with the chip. The 359 * interrupt is then enabled again in the slow handler when the source 360 * has been cleared. 361 */ 362 static irqreturn_t wm97xx_pen_interrupt(int irq, void *dev_id) 363 { 364 struct wm97xx *wm = dev_id; 365 366 if (!work_pending(&wm->pen_event_work)) { 367 wm->mach_ops->irq_enable(wm, 0); 368 queue_work(wm->ts_workq, &wm->pen_event_work); 369 } 370 371 return IRQ_HANDLED; 372 } 373 374 /* 375 * initialise pen IRQ handler and workqueue 376 */ 377 static int wm97xx_init_pen_irq(struct wm97xx *wm) 378 { 379 u16 reg; 380 381 /* If an interrupt is supplied an IRQ enable operation must also be 382 * provided. */ 383 BUG_ON(!wm->mach_ops->irq_enable); 384 385 if (request_irq(wm->pen_irq, wm97xx_pen_interrupt, IRQF_SHARED, 386 "wm97xx-pen", wm)) { 387 dev_err(wm->dev, 388 "Failed to register pen down interrupt, polling"); 389 wm->pen_irq = 0; 390 return -EINVAL; 391 } 392 393 /* Configure GPIO as interrupt source on WM971x */ 394 if (wm->id != WM9705_ID2) { 395 BUG_ON(!wm->mach_ops->irq_gpio); 396 reg = wm97xx_reg_read(wm, AC97_MISC_AFE); 397 wm97xx_reg_write(wm, AC97_MISC_AFE, 398 reg & ~(wm->mach_ops->irq_gpio)); 399 reg = wm97xx_reg_read(wm, 0x5a); 400 wm97xx_reg_write(wm, 0x5a, reg & ~0x0001); 401 } 402 403 return 0; 404 } 405 406 static int wm97xx_read_samples(struct wm97xx *wm) 407 { 408 struct wm97xx_data data; 409 int rc; 410 411 mutex_lock(&wm->codec_mutex); 412 413 if (wm->mach_ops && wm->mach_ops->acc_enabled) 414 rc = wm->mach_ops->acc_pen_down(wm); 415 else 416 rc = wm->codec->poll_touch(wm, &data); 417 418 if (rc & RC_PENUP) { 419 if (wm->pen_is_down) { 420 wm->pen_is_down = 0; 421 dev_dbg(wm->dev, "pen up\n"); 422 input_report_abs(wm->input_dev, ABS_PRESSURE, 0); 423 input_report_key(wm->input_dev, BTN_TOUCH, 0); 424 input_sync(wm->input_dev); 425 } else if (!(rc & RC_AGAIN)) { 426 /* We need high frequency updates only while 427 * pen is down, the user never will be able to 428 * touch screen faster than a few times per 429 * second... On the other hand, when the user 430 * is actively working with the touchscreen we 431 * don't want to lose the quick response. So we 432 * will slowly increase sleep time after the 433 * pen is up and quicky restore it to ~one task 434 * switch when pen is down again. 435 */ 436 if (wm->ts_reader_interval < HZ / 10) 437 wm->ts_reader_interval++; 438 } 439 440 } else if (rc & RC_VALID) { 441 dev_dbg(wm->dev, 442 "pen down: x=%x:%d, y=%x:%d, pressure=%x:%d\n", 443 data.x >> 12, data.x & 0xfff, data.y >> 12, 444 data.y & 0xfff, data.p >> 12, data.p & 0xfff); 445 446 if (abs_x[0] > (data.x & 0xfff) || 447 abs_x[1] < (data.x & 0xfff) || 448 abs_y[0] > (data.y & 0xfff) || 449 abs_y[1] < (data.y & 0xfff)) { 450 dev_dbg(wm->dev, "Measurement out of range, dropping it\n"); 451 rc = RC_AGAIN; 452 goto out; 453 } 454 455 input_report_abs(wm->input_dev, ABS_X, data.x & 0xfff); 456 input_report_abs(wm->input_dev, ABS_Y, data.y & 0xfff); 457 input_report_abs(wm->input_dev, ABS_PRESSURE, data.p & 0xfff); 458 input_report_key(wm->input_dev, BTN_TOUCH, 1); 459 input_sync(wm->input_dev); 460 wm->pen_is_down = 1; 461 wm->ts_reader_interval = wm->ts_reader_min_interval; 462 } else if (rc & RC_PENDOWN) { 463 dev_dbg(wm->dev, "pen down\n"); 464 wm->pen_is_down = 1; 465 wm->ts_reader_interval = wm->ts_reader_min_interval; 466 } 467 468 out: 469 mutex_unlock(&wm->codec_mutex); 470 return rc; 471 } 472 473 /* 474 * The touchscreen sample reader. 475 */ 476 static void wm97xx_ts_reader(struct work_struct *work) 477 { 478 int rc; 479 struct wm97xx *wm = container_of(work, struct wm97xx, ts_reader.work); 480 481 BUG_ON(!wm->codec); 482 483 do { 484 rc = wm97xx_read_samples(wm); 485 } while (rc & RC_AGAIN); 486 487 if (wm->pen_is_down || !wm->pen_irq) 488 queue_delayed_work(wm->ts_workq, &wm->ts_reader, 489 wm->ts_reader_interval); 490 } 491 492 /** 493 * wm97xx_ts_input_open - Open the touch screen input device. 494 * @idev: Input device to be opened. 495 * 496 * Called by the input sub system to open a wm97xx touchscreen device. 497 * Starts the touchscreen thread and touch digitiser. 498 */ 499 static int wm97xx_ts_input_open(struct input_dev *idev) 500 { 501 struct wm97xx *wm = input_get_drvdata(idev); 502 503 wm->ts_workq = alloc_ordered_workqueue("kwm97xx", 0); 504 if (wm->ts_workq == NULL) { 505 dev_err(wm->dev, 506 "Failed to create workqueue\n"); 507 return -EINVAL; 508 } 509 510 /* start digitiser */ 511 if (wm->mach_ops && wm->mach_ops->acc_enabled) 512 wm->codec->acc_enable(wm, 1); 513 wm->codec->dig_enable(wm, 1); 514 515 INIT_DELAYED_WORK(&wm->ts_reader, wm97xx_ts_reader); 516 INIT_WORK(&wm->pen_event_work, wm97xx_pen_irq_worker); 517 518 wm->ts_reader_min_interval = HZ >= 100 ? HZ / 100 : 1; 519 if (wm->ts_reader_min_interval < 1) 520 wm->ts_reader_min_interval = 1; 521 wm->ts_reader_interval = wm->ts_reader_min_interval; 522 523 wm->pen_is_down = 0; 524 if (wm->pen_irq) 525 wm97xx_init_pen_irq(wm); 526 else 527 dev_err(wm->dev, "No IRQ specified\n"); 528 529 /* If we either don't have an interrupt for pen down events or 530 * failed to acquire it then we need to poll. 531 */ 532 if (wm->pen_irq == 0) 533 queue_delayed_work(wm->ts_workq, &wm->ts_reader, 534 wm->ts_reader_interval); 535 536 return 0; 537 } 538 539 /** 540 * wm97xx_ts_input_close - Close the touch screen input device. 541 * @idev: Input device to be closed. 542 * 543 * Called by the input sub system to close a wm97xx touchscreen 544 * device. Kills the touchscreen thread and stops the touch 545 * digitiser. 546 */ 547 548 static void wm97xx_ts_input_close(struct input_dev *idev) 549 { 550 struct wm97xx *wm = input_get_drvdata(idev); 551 u16 reg; 552 553 if (wm->pen_irq) { 554 /* Return the interrupt to GPIO usage (disabling it) */ 555 if (wm->id != WM9705_ID2) { 556 BUG_ON(!wm->mach_ops->irq_gpio); 557 reg = wm97xx_reg_read(wm, AC97_MISC_AFE); 558 wm97xx_reg_write(wm, AC97_MISC_AFE, 559 reg | wm->mach_ops->irq_gpio); 560 } 561 562 free_irq(wm->pen_irq, wm); 563 } 564 565 wm->pen_is_down = 0; 566 567 /* Balance out interrupt disables/enables */ 568 if (cancel_work_sync(&wm->pen_event_work)) 569 wm->mach_ops->irq_enable(wm, 1); 570 571 /* ts_reader rearms itself so we need to explicitly stop it 572 * before we destroy the workqueue. 573 */ 574 cancel_delayed_work_sync(&wm->ts_reader); 575 576 destroy_workqueue(wm->ts_workq); 577 578 /* stop digitiser */ 579 wm->codec->dig_enable(wm, 0); 580 if (wm->mach_ops && wm->mach_ops->acc_enabled) 581 wm->codec->acc_enable(wm, 0); 582 } 583 584 static int wm97xx_probe(struct device *dev) 585 { 586 struct wm97xx *wm; 587 struct wm97xx_pdata *pdata = dev_get_platdata(dev); 588 int ret = 0, id = 0; 589 590 wm = kzalloc(sizeof(struct wm97xx), GFP_KERNEL); 591 if (!wm) 592 return -ENOMEM; 593 mutex_init(&wm->codec_mutex); 594 595 wm->dev = dev; 596 dev_set_drvdata(dev, wm); 597 wm->ac97 = to_ac97_t(dev); 598 599 /* check that we have a supported codec */ 600 id = wm97xx_reg_read(wm, AC97_VENDOR_ID1); 601 if (id != WM97XX_ID1) { 602 dev_err(dev, "Device with vendor %04x is not a wm97xx\n", id); 603 ret = -ENODEV; 604 goto alloc_err; 605 } 606 607 wm->id = wm97xx_reg_read(wm, AC97_VENDOR_ID2); 608 609 wm->variant = WM97xx_GENERIC; 610 611 dev_info(wm->dev, "detected a wm97%02x codec\n", wm->id & 0xff); 612 613 switch (wm->id & 0xff) { 614 #ifdef CONFIG_TOUCHSCREEN_WM9705 615 case 0x05: 616 wm->codec = &wm9705_codec; 617 break; 618 #endif 619 #ifdef CONFIG_TOUCHSCREEN_WM9712 620 case 0x12: 621 wm->codec = &wm9712_codec; 622 break; 623 #endif 624 #ifdef CONFIG_TOUCHSCREEN_WM9713 625 case 0x13: 626 wm->codec = &wm9713_codec; 627 break; 628 #endif 629 default: 630 dev_err(wm->dev, "Support for wm97%02x not compiled in.\n", 631 wm->id & 0xff); 632 ret = -ENODEV; 633 goto alloc_err; 634 } 635 636 /* set up physical characteristics */ 637 wm->codec->phy_init(wm); 638 639 /* load gpio cache */ 640 wm->gpio[0] = wm97xx_reg_read(wm, AC97_GPIO_CFG); 641 wm->gpio[1] = wm97xx_reg_read(wm, AC97_GPIO_POLARITY); 642 wm->gpio[2] = wm97xx_reg_read(wm, AC97_GPIO_STICKY); 643 wm->gpio[3] = wm97xx_reg_read(wm, AC97_GPIO_WAKEUP); 644 wm->gpio[4] = wm97xx_reg_read(wm, AC97_GPIO_STATUS); 645 wm->gpio[5] = wm97xx_reg_read(wm, AC97_MISC_AFE); 646 647 wm->input_dev = input_allocate_device(); 648 if (wm->input_dev == NULL) { 649 ret = -ENOMEM; 650 goto alloc_err; 651 } 652 653 /* set up touch configuration */ 654 wm->input_dev->name = "wm97xx touchscreen"; 655 wm->input_dev->phys = "wm97xx"; 656 wm->input_dev->open = wm97xx_ts_input_open; 657 wm->input_dev->close = wm97xx_ts_input_close; 658 659 __set_bit(EV_ABS, wm->input_dev->evbit); 660 __set_bit(EV_KEY, wm->input_dev->evbit); 661 __set_bit(BTN_TOUCH, wm->input_dev->keybit); 662 663 input_set_abs_params(wm->input_dev, ABS_X, abs_x[0], abs_x[1], 664 abs_x[2], 0); 665 input_set_abs_params(wm->input_dev, ABS_Y, abs_y[0], abs_y[1], 666 abs_y[2], 0); 667 input_set_abs_params(wm->input_dev, ABS_PRESSURE, abs_p[0], abs_p[1], 668 abs_p[2], 0); 669 670 input_set_drvdata(wm->input_dev, wm); 671 wm->input_dev->dev.parent = dev; 672 673 ret = input_register_device(wm->input_dev); 674 if (ret < 0) 675 goto dev_alloc_err; 676 677 /* register our battery device */ 678 wm->battery_dev = platform_device_alloc("wm97xx-battery", -1); 679 if (!wm->battery_dev) { 680 ret = -ENOMEM; 681 goto batt_err; 682 } 683 platform_set_drvdata(wm->battery_dev, wm); 684 wm->battery_dev->dev.parent = dev; 685 wm->battery_dev->dev.platform_data = pdata->batt_pdata; 686 ret = platform_device_add(wm->battery_dev); 687 if (ret < 0) 688 goto batt_reg_err; 689 690 /* register our extended touch device (for machine specific 691 * extensions) */ 692 wm->touch_dev = platform_device_alloc("wm97xx-touch", -1); 693 if (!wm->touch_dev) { 694 ret = -ENOMEM; 695 goto touch_err; 696 } 697 platform_set_drvdata(wm->touch_dev, wm); 698 wm->touch_dev->dev.parent = dev; 699 wm->touch_dev->dev.platform_data = pdata; 700 ret = platform_device_add(wm->touch_dev); 701 if (ret < 0) 702 goto touch_reg_err; 703 704 return ret; 705 706 touch_reg_err: 707 platform_device_put(wm->touch_dev); 708 touch_err: 709 platform_device_del(wm->battery_dev); 710 batt_reg_err: 711 platform_device_put(wm->battery_dev); 712 batt_err: 713 input_unregister_device(wm->input_dev); 714 wm->input_dev = NULL; 715 dev_alloc_err: 716 input_free_device(wm->input_dev); 717 alloc_err: 718 kfree(wm); 719 720 return ret; 721 } 722 723 static int wm97xx_remove(struct device *dev) 724 { 725 struct wm97xx *wm = dev_get_drvdata(dev); 726 727 platform_device_unregister(wm->battery_dev); 728 platform_device_unregister(wm->touch_dev); 729 input_unregister_device(wm->input_dev); 730 kfree(wm); 731 732 return 0; 733 } 734 735 static int __maybe_unused wm97xx_suspend(struct device *dev) 736 { 737 struct wm97xx *wm = dev_get_drvdata(dev); 738 u16 reg; 739 int suspend_mode; 740 741 if (device_may_wakeup(&wm->input_dev->dev)) 742 suspend_mode = wm->suspend_mode; 743 else 744 suspend_mode = 0; 745 746 if (wm->input_dev->users) 747 cancel_delayed_work_sync(&wm->ts_reader); 748 749 /* Power down the digitiser (bypassing the cache for resume) */ 750 reg = wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER2); 751 reg &= ~WM97XX_PRP_DET_DIG; 752 if (wm->input_dev->users) 753 reg |= suspend_mode; 754 wm->ac97->bus->ops->write(wm->ac97, AC97_WM97XX_DIGITISER2, reg); 755 756 /* WM9713 has an additional power bit - turn it off if there 757 * are no users or if suspend mode is zero. */ 758 if (wm->id == WM9713_ID2 && 759 (!wm->input_dev->users || !suspend_mode)) { 760 reg = wm97xx_reg_read(wm, AC97_EXTENDED_MID) | 0x8000; 761 wm97xx_reg_write(wm, AC97_EXTENDED_MID, reg); 762 } 763 764 return 0; 765 } 766 767 static int __maybe_unused wm97xx_resume(struct device *dev) 768 { 769 struct wm97xx *wm = dev_get_drvdata(dev); 770 771 /* restore digitiser and gpios */ 772 if (wm->id == WM9713_ID2) { 773 wm97xx_reg_write(wm, AC97_WM9713_DIG1, wm->dig[0]); 774 wm97xx_reg_write(wm, 0x5a, wm->misc); 775 if (wm->input_dev->users) { 776 u16 reg; 777 reg = wm97xx_reg_read(wm, AC97_EXTENDED_MID) & 0x7fff; 778 wm97xx_reg_write(wm, AC97_EXTENDED_MID, reg); 779 } 780 } 781 782 wm97xx_reg_write(wm, AC97_WM9713_DIG2, wm->dig[1]); 783 wm97xx_reg_write(wm, AC97_WM9713_DIG3, wm->dig[2]); 784 785 wm97xx_reg_write(wm, AC97_GPIO_CFG, wm->gpio[0]); 786 wm97xx_reg_write(wm, AC97_GPIO_POLARITY, wm->gpio[1]); 787 wm97xx_reg_write(wm, AC97_GPIO_STICKY, wm->gpio[2]); 788 wm97xx_reg_write(wm, AC97_GPIO_WAKEUP, wm->gpio[3]); 789 wm97xx_reg_write(wm, AC97_GPIO_STATUS, wm->gpio[4]); 790 wm97xx_reg_write(wm, AC97_MISC_AFE, wm->gpio[5]); 791 792 if (wm->input_dev->users && !wm->pen_irq) { 793 wm->ts_reader_interval = wm->ts_reader_min_interval; 794 queue_delayed_work(wm->ts_workq, &wm->ts_reader, 795 wm->ts_reader_interval); 796 } 797 798 return 0; 799 } 800 801 static SIMPLE_DEV_PM_OPS(wm97xx_pm_ops, wm97xx_suspend, wm97xx_resume); 802 803 /* 804 * Machine specific operations 805 */ 806 int wm97xx_register_mach_ops(struct wm97xx *wm, 807 struct wm97xx_mach_ops *mach_ops) 808 { 809 mutex_lock(&wm->codec_mutex); 810 if (wm->mach_ops) { 811 mutex_unlock(&wm->codec_mutex); 812 return -EINVAL; 813 } 814 wm->mach_ops = mach_ops; 815 mutex_unlock(&wm->codec_mutex); 816 817 return 0; 818 } 819 EXPORT_SYMBOL_GPL(wm97xx_register_mach_ops); 820 821 void wm97xx_unregister_mach_ops(struct wm97xx *wm) 822 { 823 mutex_lock(&wm->codec_mutex); 824 wm->mach_ops = NULL; 825 mutex_unlock(&wm->codec_mutex); 826 } 827 EXPORT_SYMBOL_GPL(wm97xx_unregister_mach_ops); 828 829 static struct device_driver wm97xx_driver = { 830 .name = "wm97xx-ts", 831 .bus = &ac97_bus_type, 832 .owner = THIS_MODULE, 833 .probe = wm97xx_probe, 834 .remove = wm97xx_remove, 835 .pm = &wm97xx_pm_ops, 836 }; 837 838 static int __init wm97xx_init(void) 839 { 840 return driver_register(&wm97xx_driver); 841 } 842 843 static void __exit wm97xx_exit(void) 844 { 845 driver_unregister(&wm97xx_driver); 846 } 847 848 module_init(wm97xx_init); 849 module_exit(wm97xx_exit); 850 851 /* Module information */ 852 MODULE_AUTHOR("Liam Girdwood <lrg@slimlogic.co.uk>"); 853 MODULE_DESCRIPTION("WM97xx Core - Touch Screen / AUX ADC / GPIO Driver"); 854 MODULE_LICENSE("GPL"); 855