Mark Brown | febf1df | 2008-04-02 00:51:09 -0400 | [diff] [blame^] | 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 | * Handle a pen down interrupt. |
| 266 | */ |
| 267 | static void wm97xx_pen_irq_worker(struct work_struct *work) |
| 268 | { |
| 269 | struct wm97xx *wm = container_of(work, struct wm97xx, pen_event_work); |
| 270 | int pen_was_down = wm->pen_is_down; |
| 271 | |
| 272 | /* do we need to enable the touch panel reader */ |
| 273 | if (wm->id == WM9705_ID2) { |
| 274 | if (wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER_RD) & |
| 275 | WM97XX_PEN_DOWN) |
| 276 | wm->pen_is_down = 1; |
| 277 | else |
| 278 | wm->pen_is_down = 0; |
| 279 | } else { |
| 280 | u16 status, pol; |
| 281 | mutex_lock(&wm->codec_mutex); |
| 282 | status = wm97xx_reg_read(wm, AC97_GPIO_STATUS); |
| 283 | pol = wm97xx_reg_read(wm, AC97_GPIO_POLARITY); |
| 284 | |
| 285 | if (WM97XX_GPIO_13 & pol & status) { |
| 286 | wm->pen_is_down = 1; |
| 287 | wm97xx_reg_write(wm, AC97_GPIO_POLARITY, pol & |
| 288 | ~WM97XX_GPIO_13); |
| 289 | } else { |
| 290 | wm->pen_is_down = 0; |
| 291 | wm97xx_reg_write(wm, AC97_GPIO_POLARITY, pol | |
| 292 | WM97XX_GPIO_13); |
| 293 | } |
| 294 | |
| 295 | if (wm->id == WM9712_ID2) |
| 296 | wm97xx_reg_write(wm, AC97_GPIO_STATUS, (status & |
| 297 | ~WM97XX_GPIO_13) << 1); |
| 298 | else |
| 299 | wm97xx_reg_write(wm, AC97_GPIO_STATUS, status & |
| 300 | ~WM97XX_GPIO_13); |
| 301 | mutex_unlock(&wm->codec_mutex); |
| 302 | } |
| 303 | |
| 304 | /* If the system is not using continuous mode or it provides a |
| 305 | * pen down operation then we need to schedule polls while the |
| 306 | * pen is down. Otherwise the machine driver is responsible |
| 307 | * for scheduling reads. |
| 308 | */ |
| 309 | if (!wm->mach_ops->acc_enabled || wm->mach_ops->acc_pen_down) { |
| 310 | if (wm->pen_is_down && !pen_was_down) { |
| 311 | /* Data is not availiable immediately on pen down */ |
| 312 | queue_delayed_work(wm->ts_workq, &wm->ts_reader, 1); |
| 313 | } |
| 314 | |
| 315 | /* Let ts_reader report the pen up for debounce. */ |
| 316 | if (!wm->pen_is_down && pen_was_down) |
| 317 | wm->pen_is_down = 1; |
| 318 | } |
| 319 | |
| 320 | if (!wm->pen_is_down && wm->mach_ops->acc_enabled) |
| 321 | wm->mach_ops->acc_pen_up(wm); |
| 322 | |
| 323 | wm->mach_ops->irq_enable(wm, 1); |
| 324 | } |
| 325 | |
| 326 | /* |
| 327 | * Codec PENDOWN irq handler |
| 328 | * |
| 329 | * We have to disable the codec interrupt in the handler because it |
| 330 | * can take upto 1ms to clear the interrupt source. We schedule a task |
| 331 | * in a work queue to do the actual interaction with the chip (it |
| 332 | * doesn't matter if we end up reenqueing it before it is executed |
| 333 | * since we don't touch the chip until it has run). The interrupt is |
| 334 | * then enabled again in the slow handler when the source has been |
| 335 | * cleared. |
| 336 | */ |
| 337 | static irqreturn_t wm97xx_pen_interrupt(int irq, void *dev_id) |
| 338 | { |
| 339 | struct wm97xx *wm = dev_id; |
| 340 | |
| 341 | wm->mach_ops->irq_enable(wm, 0); |
| 342 | queue_work(wm->ts_workq, &wm->pen_event_work); |
| 343 | |
| 344 | return IRQ_HANDLED; |
| 345 | } |
| 346 | |
| 347 | /* |
| 348 | * initialise pen IRQ handler and workqueue |
| 349 | */ |
| 350 | static int wm97xx_init_pen_irq(struct wm97xx *wm) |
| 351 | { |
| 352 | u16 reg; |
| 353 | |
| 354 | /* If an interrupt is supplied an IRQ enable operation must also be |
| 355 | * provided. */ |
| 356 | BUG_ON(!wm->mach_ops->irq_enable); |
| 357 | |
| 358 | if (request_irq(wm->pen_irq, wm97xx_pen_interrupt, IRQF_SHARED, |
| 359 | "wm97xx-pen", wm)) { |
| 360 | dev_err(wm->dev, |
| 361 | "Failed to register pen down interrupt, polling"); |
| 362 | wm->pen_irq = 0; |
| 363 | return -EINVAL; |
| 364 | } |
| 365 | |
| 366 | /* Configure GPIO as interrupt source on WM971x */ |
| 367 | if (wm->id != WM9705_ID2) { |
| 368 | BUG_ON(!wm->mach_ops->irq_gpio); |
| 369 | reg = wm97xx_reg_read(wm, AC97_MISC_AFE); |
| 370 | wm97xx_reg_write(wm, AC97_MISC_AFE, |
| 371 | reg & ~(wm->mach_ops->irq_gpio)); |
| 372 | reg = wm97xx_reg_read(wm, 0x5a); |
| 373 | wm97xx_reg_write(wm, 0x5a, reg & ~0x0001); |
| 374 | } |
| 375 | |
| 376 | return 0; |
| 377 | } |
| 378 | |
| 379 | static int wm97xx_read_samples(struct wm97xx *wm) |
| 380 | { |
| 381 | struct wm97xx_data data; |
| 382 | int rc; |
| 383 | |
| 384 | mutex_lock(&wm->codec_mutex); |
| 385 | |
| 386 | if (wm->mach_ops && wm->mach_ops->acc_enabled) |
| 387 | rc = wm->mach_ops->acc_pen_down(wm); |
| 388 | else |
| 389 | rc = wm->codec->poll_touch(wm, &data); |
| 390 | |
| 391 | if (rc & RC_PENUP) { |
| 392 | if (wm->pen_is_down) { |
| 393 | wm->pen_is_down = 0; |
| 394 | dev_dbg(wm->dev, "pen up\n"); |
| 395 | input_report_abs(wm->input_dev, ABS_PRESSURE, 0); |
| 396 | input_sync(wm->input_dev); |
| 397 | } else if (!(rc & RC_AGAIN)) { |
| 398 | /* We need high frequency updates only while |
| 399 | * pen is down, the user never will be able to |
| 400 | * touch screen faster than a few times per |
| 401 | * second... On the other hand, when the user |
| 402 | * is actively working with the touchscreen we |
| 403 | * don't want to lose the quick response. So we |
| 404 | * will slowly increase sleep time after the |
| 405 | * pen is up and quicky restore it to ~one task |
| 406 | * switch when pen is down again. |
| 407 | */ |
| 408 | if (wm->ts_reader_interval < HZ / 10) |
| 409 | wm->ts_reader_interval++; |
| 410 | } |
| 411 | |
| 412 | } else if (rc & RC_VALID) { |
| 413 | dev_dbg(wm->dev, |
| 414 | "pen down: x=%x:%d, y=%x:%d, pressure=%x:%d\n", |
| 415 | data.x >> 12, data.x & 0xfff, data.y >> 12, |
| 416 | data.y & 0xfff, data.p >> 12, data.p & 0xfff); |
| 417 | input_report_abs(wm->input_dev, ABS_X, data.x & 0xfff); |
| 418 | input_report_abs(wm->input_dev, ABS_Y, data.y & 0xfff); |
| 419 | input_report_abs(wm->input_dev, ABS_PRESSURE, data.p & 0xfff); |
| 420 | input_sync(wm->input_dev); |
| 421 | wm->pen_is_down = 1; |
| 422 | wm->ts_reader_interval = wm->ts_reader_min_interval; |
| 423 | } else if (rc & RC_PENDOWN) { |
| 424 | dev_dbg(wm->dev, "pen down\n"); |
| 425 | wm->pen_is_down = 1; |
| 426 | wm->ts_reader_interval = wm->ts_reader_min_interval; |
| 427 | } |
| 428 | |
| 429 | mutex_unlock(&wm->codec_mutex); |
| 430 | return rc; |
| 431 | } |
| 432 | |
| 433 | /* |
| 434 | * The touchscreen sample reader. |
| 435 | */ |
| 436 | static void wm97xx_ts_reader(struct work_struct *work) |
| 437 | { |
| 438 | int rc; |
| 439 | struct wm97xx *wm = container_of(work, struct wm97xx, ts_reader.work); |
| 440 | |
| 441 | BUG_ON(!wm->codec); |
| 442 | |
| 443 | do { |
| 444 | rc = wm97xx_read_samples(wm); |
| 445 | } while (rc & RC_AGAIN); |
| 446 | |
| 447 | if (wm->pen_is_down || !wm->pen_irq) |
| 448 | queue_delayed_work(wm->ts_workq, &wm->ts_reader, |
| 449 | wm->ts_reader_interval); |
| 450 | } |
| 451 | |
| 452 | /** |
| 453 | * wm97xx_ts_input_open - Open the touch screen input device. |
| 454 | * @idev: Input device to be opened. |
| 455 | * |
| 456 | * Called by the input sub system to open a wm97xx touchscreen device. |
| 457 | * Starts the touchscreen thread and touch digitiser. |
| 458 | */ |
| 459 | static int wm97xx_ts_input_open(struct input_dev *idev) |
| 460 | { |
| 461 | struct wm97xx *wm = input_get_drvdata(idev); |
| 462 | |
| 463 | wm->ts_workq = create_singlethread_workqueue("kwm97xx"); |
| 464 | if (wm->ts_workq == NULL) { |
| 465 | dev_err(wm->dev, |
| 466 | "Failed to create workqueue\n"); |
| 467 | return -EINVAL; |
| 468 | } |
| 469 | |
| 470 | /* start digitiser */ |
| 471 | if (wm->mach_ops && wm->mach_ops->acc_enabled) |
| 472 | wm->codec->acc_enable(wm, 1); |
| 473 | wm->codec->dig_enable(wm, 1); |
| 474 | |
| 475 | INIT_DELAYED_WORK(&wm->ts_reader, wm97xx_ts_reader); |
| 476 | INIT_WORK(&wm->pen_event_work, wm97xx_pen_irq_worker); |
| 477 | |
| 478 | wm->ts_reader_min_interval = HZ >= 100 ? HZ / 100 : 1; |
| 479 | if (wm->ts_reader_min_interval < 1) |
| 480 | wm->ts_reader_min_interval = 1; |
| 481 | wm->ts_reader_interval = wm->ts_reader_min_interval; |
| 482 | |
| 483 | wm->pen_is_down = 0; |
| 484 | if (wm->pen_irq) |
| 485 | wm97xx_init_pen_irq(wm); |
| 486 | else |
| 487 | dev_err(wm->dev, "No IRQ specified\n"); |
| 488 | |
| 489 | /* If we either don't have an interrupt for pen down events or |
| 490 | * failed to acquire it then we need to poll. |
| 491 | */ |
| 492 | if (wm->pen_irq == 0) |
| 493 | queue_delayed_work(wm->ts_workq, &wm->ts_reader, |
| 494 | wm->ts_reader_interval); |
| 495 | |
| 496 | return 0; |
| 497 | } |
| 498 | |
| 499 | /** |
| 500 | * wm97xx_ts_input_close - Close the touch screen input device. |
| 501 | * @idev: Input device to be closed. |
| 502 | * |
| 503 | * Called by the input sub system to close a wm97xx touchscreen |
| 504 | * device. Kills the touchscreen thread and stops the touch |
| 505 | * digitiser. |
| 506 | */ |
| 507 | |
| 508 | static void wm97xx_ts_input_close(struct input_dev *idev) |
| 509 | { |
| 510 | struct wm97xx *wm = input_get_drvdata(idev); |
| 511 | u16 reg; |
| 512 | |
| 513 | if (wm->pen_irq) { |
| 514 | /* Return the interrupt to GPIO usage (disabling it) */ |
| 515 | if (wm->id != WM9705_ID2) { |
| 516 | BUG_ON(!wm->mach_ops->irq_gpio); |
| 517 | reg = wm97xx_reg_read(wm, AC97_MISC_AFE); |
| 518 | wm97xx_reg_write(wm, AC97_MISC_AFE, |
| 519 | reg | wm->mach_ops->irq_gpio); |
| 520 | } |
| 521 | |
| 522 | free_irq(wm->pen_irq, wm); |
| 523 | } |
| 524 | |
| 525 | wm->pen_is_down = 0; |
| 526 | |
| 527 | /* Balance out interrupt disables/enables */ |
| 528 | if (cancel_work_sync(&wm->pen_event_work)) |
| 529 | wm->mach_ops->irq_enable(wm, 1); |
| 530 | |
| 531 | /* ts_reader rearms itself so we need to explicitly stop it |
| 532 | * before we destroy the workqueue. |
| 533 | */ |
| 534 | cancel_delayed_work_sync(&wm->ts_reader); |
| 535 | |
| 536 | destroy_workqueue(wm->ts_workq); |
| 537 | |
| 538 | /* stop digitiser */ |
| 539 | wm->codec->dig_enable(wm, 0); |
| 540 | if (wm->mach_ops && wm->mach_ops->acc_enabled) |
| 541 | wm->codec->acc_enable(wm, 0); |
| 542 | } |
| 543 | |
| 544 | static int wm97xx_probe(struct device *dev) |
| 545 | { |
| 546 | struct wm97xx *wm; |
| 547 | int ret = 0, id = 0; |
| 548 | |
| 549 | wm = kzalloc(sizeof(struct wm97xx), GFP_KERNEL); |
| 550 | if (!wm) |
| 551 | return -ENOMEM; |
| 552 | mutex_init(&wm->codec_mutex); |
| 553 | |
| 554 | wm->dev = dev; |
| 555 | dev->driver_data = wm; |
| 556 | wm->ac97 = to_ac97_t(dev); |
| 557 | |
| 558 | /* check that we have a supported codec */ |
| 559 | id = wm97xx_reg_read(wm, AC97_VENDOR_ID1); |
| 560 | if (id != WM97XX_ID1) { |
| 561 | dev_err(dev, "Device with vendor %04x is not a wm97xx\n", id); |
| 562 | ret = -ENODEV; |
| 563 | goto alloc_err; |
| 564 | } |
| 565 | |
| 566 | wm->id = wm97xx_reg_read(wm, AC97_VENDOR_ID2); |
| 567 | |
| 568 | dev_info(wm->dev, "detected a wm97%02x codec\n", wm->id & 0xff); |
| 569 | |
| 570 | switch (wm->id & 0xff) { |
| 571 | #ifdef CONFIG_TOUCHSCREEN_WM9705 |
| 572 | case 0x05: |
| 573 | wm->codec = &wm9705_codec; |
| 574 | break; |
| 575 | #endif |
| 576 | #ifdef CONFIG_TOUCHSCREEN_WM9712 |
| 577 | case 0x12: |
| 578 | wm->codec = &wm9712_codec; |
| 579 | break; |
| 580 | #endif |
| 581 | #ifdef CONFIG_TOUCHSCREEN_WM9713 |
| 582 | case 0x13: |
| 583 | wm->codec = &wm9713_codec; |
| 584 | break; |
| 585 | #endif |
| 586 | default: |
| 587 | dev_err(wm->dev, "Support for wm97%02x not compiled in.\n", |
| 588 | wm->id & 0xff); |
| 589 | ret = -ENODEV; |
| 590 | goto alloc_err; |
| 591 | } |
| 592 | |
| 593 | wm->input_dev = input_allocate_device(); |
| 594 | if (wm->input_dev == NULL) { |
| 595 | ret = -ENOMEM; |
| 596 | goto alloc_err; |
| 597 | } |
| 598 | |
| 599 | /* set up touch configuration */ |
| 600 | wm->input_dev->name = "wm97xx touchscreen"; |
| 601 | wm->input_dev->open = wm97xx_ts_input_open; |
| 602 | wm->input_dev->close = wm97xx_ts_input_close; |
| 603 | set_bit(EV_ABS, wm->input_dev->evbit); |
| 604 | set_bit(ABS_X, wm->input_dev->absbit); |
| 605 | set_bit(ABS_Y, wm->input_dev->absbit); |
| 606 | set_bit(ABS_PRESSURE, wm->input_dev->absbit); |
| 607 | input_set_abs_params(wm->input_dev, ABS_X, abs_x[0], abs_x[1], |
| 608 | abs_x[2], 0); |
| 609 | input_set_abs_params(wm->input_dev, ABS_Y, abs_y[0], abs_y[1], |
| 610 | abs_y[2], 0); |
| 611 | input_set_abs_params(wm->input_dev, ABS_PRESSURE, abs_p[0], abs_p[1], |
| 612 | abs_p[2], 0); |
| 613 | input_set_drvdata(wm->input_dev, wm); |
| 614 | wm->input_dev->dev.parent = dev; |
| 615 | ret = input_register_device(wm->input_dev); |
| 616 | if (ret < 0) |
| 617 | goto dev_alloc_err; |
| 618 | |
| 619 | /* set up physical characteristics */ |
| 620 | wm->codec->phy_init(wm); |
| 621 | |
| 622 | /* load gpio cache */ |
| 623 | wm->gpio[0] = wm97xx_reg_read(wm, AC97_GPIO_CFG); |
| 624 | wm->gpio[1] = wm97xx_reg_read(wm, AC97_GPIO_POLARITY); |
| 625 | wm->gpio[2] = wm97xx_reg_read(wm, AC97_GPIO_STICKY); |
| 626 | wm->gpio[3] = wm97xx_reg_read(wm, AC97_GPIO_WAKEUP); |
| 627 | wm->gpio[4] = wm97xx_reg_read(wm, AC97_GPIO_STATUS); |
| 628 | wm->gpio[5] = wm97xx_reg_read(wm, AC97_MISC_AFE); |
| 629 | |
| 630 | /* register our battery device */ |
| 631 | wm->battery_dev = platform_device_alloc("wm97xx-battery", -1); |
| 632 | if (!wm->battery_dev) { |
| 633 | ret = -ENOMEM; |
| 634 | goto batt_err; |
| 635 | } |
| 636 | platform_set_drvdata(wm->battery_dev, wm); |
| 637 | wm->battery_dev->dev.parent = dev; |
| 638 | ret = platform_device_add(wm->battery_dev); |
| 639 | if (ret < 0) |
| 640 | goto batt_reg_err; |
| 641 | |
| 642 | /* register our extended touch device (for machine specific |
| 643 | * extensions) */ |
| 644 | wm->touch_dev = platform_device_alloc("wm97xx-touch", -1); |
| 645 | if (!wm->touch_dev) { |
| 646 | ret = -ENOMEM; |
| 647 | goto touch_err; |
| 648 | } |
| 649 | platform_set_drvdata(wm->touch_dev, wm); |
| 650 | wm->touch_dev->dev.parent = dev; |
| 651 | ret = platform_device_add(wm->touch_dev); |
| 652 | if (ret < 0) |
| 653 | goto touch_reg_err; |
| 654 | |
| 655 | return ret; |
| 656 | |
| 657 | touch_reg_err: |
| 658 | platform_device_put(wm->touch_dev); |
| 659 | touch_err: |
| 660 | platform_device_unregister(wm->battery_dev); |
| 661 | wm->battery_dev = NULL; |
| 662 | batt_reg_err: |
| 663 | platform_device_put(wm->battery_dev); |
| 664 | batt_err: |
| 665 | input_unregister_device(wm->input_dev); |
| 666 | wm->input_dev = NULL; |
| 667 | dev_alloc_err: |
| 668 | input_free_device(wm->input_dev); |
| 669 | alloc_err: |
| 670 | kfree(wm); |
| 671 | |
| 672 | return ret; |
| 673 | } |
| 674 | |
| 675 | static int wm97xx_remove(struct device *dev) |
| 676 | { |
| 677 | struct wm97xx *wm = dev_get_drvdata(dev); |
| 678 | |
| 679 | platform_device_unregister(wm->battery_dev); |
| 680 | platform_device_unregister(wm->touch_dev); |
| 681 | input_unregister_device(wm->input_dev); |
| 682 | kfree(wm); |
| 683 | |
| 684 | return 0; |
| 685 | } |
| 686 | |
| 687 | #ifdef CONFIG_PM |
| 688 | static int wm97xx_suspend(struct device *dev, pm_message_t state) |
| 689 | { |
| 690 | struct wm97xx *wm = dev_get_drvdata(dev); |
| 691 | |
| 692 | if (wm->input_dev->users) |
| 693 | cancel_delayed_work_sync(&wm->ts_reader); |
| 694 | |
| 695 | return 0; |
| 696 | } |
| 697 | |
| 698 | static int wm97xx_resume(struct device *dev) |
| 699 | { |
| 700 | struct wm97xx *wm = dev_get_drvdata(dev); |
| 701 | |
| 702 | /* restore digitiser and gpios */ |
| 703 | if (wm->id == WM9713_ID2) { |
| 704 | wm97xx_reg_write(wm, AC97_WM9713_DIG1, wm->dig[0]); |
| 705 | wm97xx_reg_write(wm, 0x5a, wm->misc); |
| 706 | if (wm->input_dev->users) { |
| 707 | u16 reg; |
| 708 | reg = wm97xx_reg_read(wm, AC97_EXTENDED_MID) & 0x7fff; |
| 709 | wm97xx_reg_write(wm, AC97_EXTENDED_MID, reg); |
| 710 | } |
| 711 | } |
| 712 | |
| 713 | wm97xx_reg_write(wm, AC97_WM9713_DIG2, wm->dig[1]); |
| 714 | wm97xx_reg_write(wm, AC97_WM9713_DIG3, wm->dig[2]); |
| 715 | |
| 716 | wm97xx_reg_write(wm, AC97_GPIO_CFG, wm->gpio[0]); |
| 717 | wm97xx_reg_write(wm, AC97_GPIO_POLARITY, wm->gpio[1]); |
| 718 | wm97xx_reg_write(wm, AC97_GPIO_STICKY, wm->gpio[2]); |
| 719 | wm97xx_reg_write(wm, AC97_GPIO_WAKEUP, wm->gpio[3]); |
| 720 | wm97xx_reg_write(wm, AC97_GPIO_STATUS, wm->gpio[4]); |
| 721 | wm97xx_reg_write(wm, AC97_MISC_AFE, wm->gpio[5]); |
| 722 | |
| 723 | if (wm->input_dev->users && !wm->pen_irq) { |
| 724 | wm->ts_reader_interval = wm->ts_reader_min_interval; |
| 725 | queue_delayed_work(wm->ts_workq, &wm->ts_reader, |
| 726 | wm->ts_reader_interval); |
| 727 | } |
| 728 | |
| 729 | return 0; |
| 730 | } |
| 731 | |
| 732 | #else |
| 733 | #define wm97xx_suspend NULL |
| 734 | #define wm97xx_resume NULL |
| 735 | #endif |
| 736 | |
| 737 | /* |
| 738 | * Machine specific operations |
| 739 | */ |
| 740 | int wm97xx_register_mach_ops(struct wm97xx *wm, |
| 741 | struct wm97xx_mach_ops *mach_ops) |
| 742 | { |
| 743 | mutex_lock(&wm->codec_mutex); |
| 744 | if (wm->mach_ops) { |
| 745 | mutex_unlock(&wm->codec_mutex); |
| 746 | return -EINVAL; |
| 747 | } |
| 748 | wm->mach_ops = mach_ops; |
| 749 | mutex_unlock(&wm->codec_mutex); |
| 750 | |
| 751 | return 0; |
| 752 | } |
| 753 | EXPORT_SYMBOL_GPL(wm97xx_register_mach_ops); |
| 754 | |
| 755 | void wm97xx_unregister_mach_ops(struct wm97xx *wm) |
| 756 | { |
| 757 | mutex_lock(&wm->codec_mutex); |
| 758 | wm->mach_ops = NULL; |
| 759 | mutex_unlock(&wm->codec_mutex); |
| 760 | } |
| 761 | EXPORT_SYMBOL_GPL(wm97xx_unregister_mach_ops); |
| 762 | |
| 763 | static struct device_driver wm97xx_driver = { |
| 764 | .name = "ac97", |
| 765 | .bus = &ac97_bus_type, |
| 766 | .owner = THIS_MODULE, |
| 767 | .probe = wm97xx_probe, |
| 768 | .remove = wm97xx_remove, |
| 769 | .suspend = wm97xx_suspend, |
| 770 | .resume = wm97xx_resume, |
| 771 | }; |
| 772 | |
| 773 | static int __init wm97xx_init(void) |
| 774 | { |
| 775 | return driver_register(&wm97xx_driver); |
| 776 | } |
| 777 | |
| 778 | static void __exit wm97xx_exit(void) |
| 779 | { |
| 780 | driver_unregister(&wm97xx_driver); |
| 781 | } |
| 782 | |
| 783 | module_init(wm97xx_init); |
| 784 | module_exit(wm97xx_exit); |
| 785 | |
| 786 | /* Module information */ |
| 787 | MODULE_AUTHOR("Liam Girdwood <liam.girdwood@wolfsonmicro.com>"); |
| 788 | MODULE_DESCRIPTION("WM97xx Core - Touch Screen / AUX ADC / GPIO Driver"); |
| 789 | MODULE_LICENSE("GPL"); |