1febf1dffSMark Brown /* 2febf1dffSMark Brown * wm97xx-core.c -- Touch screen driver core for Wolfson WM9705, WM9712 3febf1dffSMark Brown * and WM9713 AC97 Codecs. 4febf1dffSMark Brown * 5febf1dffSMark Brown * Copyright 2003, 2004, 2005, 2006, 2007, 2008 Wolfson Microelectronics PLC. 6b8d055a8SLiam Girdwood * Author: Liam Girdwood <lrg@slimlogic.co.uk> 7febf1dffSMark Brown * Parts Copyright : Ian Molton <spyro@f2s.com> 8febf1dffSMark Brown * Andrew Zabolotny <zap@homelink.ru> 9febf1dffSMark Brown * Russell King <rmk@arm.linux.org.uk> 10febf1dffSMark Brown * 11febf1dffSMark Brown * This program is free software; you can redistribute it and/or modify it 12febf1dffSMark Brown * under the terms of the GNU General Public License as published by the 13febf1dffSMark Brown * Free Software Foundation; either version 2 of the License, or (at your 14febf1dffSMark Brown * option) any later version. 15febf1dffSMark Brown * 16febf1dffSMark Brown * Notes: 17febf1dffSMark Brown * 18febf1dffSMark Brown * Features: 19febf1dffSMark Brown * - supports WM9705, WM9712, WM9713 20febf1dffSMark Brown * - polling mode 21febf1dffSMark Brown * - continuous mode (arch-dependent) 22febf1dffSMark Brown * - adjustable rpu/dpp settings 23febf1dffSMark Brown * - adjustable pressure current 24febf1dffSMark Brown * - adjustable sample settle delay 25febf1dffSMark Brown * - 4 and 5 wire touchscreens (5 wire is WM9712 only) 26febf1dffSMark Brown * - pen down detection 27febf1dffSMark Brown * - battery monitor 28febf1dffSMark Brown * - sample AUX adcs 29febf1dffSMark Brown * - power management 30febf1dffSMark Brown * - codec GPIO 31febf1dffSMark Brown * - codec event notification 32febf1dffSMark Brown * Todo 33febf1dffSMark Brown * - Support for async sampling control for noisy LCDs. 34febf1dffSMark Brown * 35febf1dffSMark Brown */ 36febf1dffSMark Brown 37febf1dffSMark Brown #include <linux/module.h> 38febf1dffSMark Brown #include <linux/moduleparam.h> 39febf1dffSMark Brown #include <linux/kernel.h> 40febf1dffSMark Brown #include <linux/init.h> 41febf1dffSMark Brown #include <linux/delay.h> 42febf1dffSMark Brown #include <linux/string.h> 43febf1dffSMark Brown #include <linux/proc_fs.h> 44febf1dffSMark Brown #include <linux/pm.h> 45febf1dffSMark Brown #include <linux/interrupt.h> 46febf1dffSMark Brown #include <linux/bitops.h> 47febf1dffSMark Brown #include <linux/workqueue.h> 48febf1dffSMark Brown #include <linux/wm97xx.h> 49febf1dffSMark Brown #include <linux/uaccess.h> 50febf1dffSMark Brown #include <linux/io.h> 51febf1dffSMark Brown 52febf1dffSMark Brown #define TS_NAME "wm97xx" 53febf1dffSMark Brown #define WM_CORE_VERSION "1.00" 54febf1dffSMark Brown #define DEFAULT_PRESSURE 0xb0c0 55febf1dffSMark Brown 56febf1dffSMark Brown 57febf1dffSMark Brown /* 58febf1dffSMark Brown * Touchscreen absolute values 59febf1dffSMark Brown * 60febf1dffSMark Brown * These parameters are used to help the input layer discard out of 61febf1dffSMark Brown * range readings and reduce jitter etc. 62febf1dffSMark Brown * 63febf1dffSMark Brown * o min, max:- indicate the min and max values your touch screen returns 64febf1dffSMark Brown * o fuzz:- use a higher number to reduce jitter 65febf1dffSMark Brown * 66febf1dffSMark Brown * The default values correspond to Mainstone II in QVGA mode 67febf1dffSMark Brown * 68febf1dffSMark Brown * Please read 69febf1dffSMark Brown * Documentation/input/input-programming.txt for more details. 70febf1dffSMark Brown */ 71febf1dffSMark Brown 72febf1dffSMark Brown static int abs_x[3] = {350, 3900, 5}; 73febf1dffSMark Brown module_param_array(abs_x, int, NULL, 0); 74febf1dffSMark Brown MODULE_PARM_DESC(abs_x, "Touchscreen absolute X min, max, fuzz"); 75febf1dffSMark Brown 76febf1dffSMark Brown static int abs_y[3] = {320, 3750, 40}; 77febf1dffSMark Brown module_param_array(abs_y, int, NULL, 0); 78febf1dffSMark Brown MODULE_PARM_DESC(abs_y, "Touchscreen absolute Y min, max, fuzz"); 79febf1dffSMark Brown 80febf1dffSMark Brown static int abs_p[3] = {0, 150, 4}; 81febf1dffSMark Brown module_param_array(abs_p, int, NULL, 0); 82febf1dffSMark Brown MODULE_PARM_DESC(abs_p, "Touchscreen absolute Pressure min, max, fuzz"); 83febf1dffSMark Brown 84febf1dffSMark Brown /* 85febf1dffSMark Brown * wm97xx IO access, all IO locking done by AC97 layer 86febf1dffSMark Brown */ 87febf1dffSMark Brown int wm97xx_reg_read(struct wm97xx *wm, u16 reg) 88febf1dffSMark Brown { 89febf1dffSMark Brown if (wm->ac97) 90febf1dffSMark Brown return wm->ac97->bus->ops->read(wm->ac97, reg); 91febf1dffSMark Brown else 92febf1dffSMark Brown return -1; 93febf1dffSMark Brown } 94febf1dffSMark Brown EXPORT_SYMBOL_GPL(wm97xx_reg_read); 95febf1dffSMark Brown 96febf1dffSMark Brown void wm97xx_reg_write(struct wm97xx *wm, u16 reg, u16 val) 97febf1dffSMark Brown { 98febf1dffSMark Brown /* cache digitiser registers */ 99febf1dffSMark Brown if (reg >= AC97_WM9713_DIG1 && reg <= AC97_WM9713_DIG3) 100febf1dffSMark Brown wm->dig[(reg - AC97_WM9713_DIG1) >> 1] = val; 101febf1dffSMark Brown 102febf1dffSMark Brown /* cache gpio regs */ 103febf1dffSMark Brown if (reg >= AC97_GPIO_CFG && reg <= AC97_MISC_AFE) 104febf1dffSMark Brown wm->gpio[(reg - AC97_GPIO_CFG) >> 1] = val; 105febf1dffSMark Brown 106febf1dffSMark Brown /* wm9713 irq reg */ 107febf1dffSMark Brown if (reg == 0x5a) 108febf1dffSMark Brown wm->misc = val; 109febf1dffSMark Brown 110febf1dffSMark Brown if (wm->ac97) 111febf1dffSMark Brown wm->ac97->bus->ops->write(wm->ac97, reg, val); 112febf1dffSMark Brown } 113febf1dffSMark Brown EXPORT_SYMBOL_GPL(wm97xx_reg_write); 114febf1dffSMark Brown 115febf1dffSMark Brown /** 116febf1dffSMark Brown * wm97xx_read_aux_adc - Read the aux adc. 117febf1dffSMark Brown * @wm: wm97xx device. 118febf1dffSMark Brown * @adcsel: codec ADC to be read 119febf1dffSMark Brown * 120febf1dffSMark Brown * Reads the selected AUX ADC. 121febf1dffSMark Brown */ 122febf1dffSMark Brown 123febf1dffSMark Brown int wm97xx_read_aux_adc(struct wm97xx *wm, u16 adcsel) 124febf1dffSMark Brown { 125febf1dffSMark Brown int power_adc = 0, auxval; 126febf1dffSMark Brown u16 power = 0; 127febf1dffSMark Brown 128febf1dffSMark Brown /* get codec */ 129febf1dffSMark Brown mutex_lock(&wm->codec_mutex); 130febf1dffSMark Brown 131febf1dffSMark Brown /* When the touchscreen is not in use, we may have to power up 132febf1dffSMark Brown * the AUX ADC before we can use sample the AUX inputs-> 133febf1dffSMark Brown */ 134febf1dffSMark Brown if (wm->id == WM9713_ID2 && 135febf1dffSMark Brown (power = wm97xx_reg_read(wm, AC97_EXTENDED_MID)) & 0x8000) { 136febf1dffSMark Brown power_adc = 1; 137febf1dffSMark Brown wm97xx_reg_write(wm, AC97_EXTENDED_MID, power & 0x7fff); 138febf1dffSMark Brown } 139febf1dffSMark Brown 140febf1dffSMark Brown /* Prepare the codec for AUX reading */ 141febf1dffSMark Brown wm->codec->aux_prepare(wm); 142febf1dffSMark Brown 143febf1dffSMark Brown /* Turn polling mode on to read AUX ADC */ 144febf1dffSMark Brown wm->pen_probably_down = 1; 145febf1dffSMark Brown wm->codec->poll_sample(wm, adcsel, &auxval); 146febf1dffSMark Brown 147febf1dffSMark Brown if (power_adc) 148febf1dffSMark Brown wm97xx_reg_write(wm, AC97_EXTENDED_MID, power | 0x8000); 149febf1dffSMark Brown 150febf1dffSMark Brown wm->codec->dig_restore(wm); 151febf1dffSMark Brown 152febf1dffSMark Brown wm->pen_probably_down = 0; 153febf1dffSMark Brown 154febf1dffSMark Brown mutex_unlock(&wm->codec_mutex); 155febf1dffSMark Brown return auxval & 0xfff; 156febf1dffSMark Brown } 157febf1dffSMark Brown EXPORT_SYMBOL_GPL(wm97xx_read_aux_adc); 158febf1dffSMark Brown 159febf1dffSMark Brown /** 160febf1dffSMark Brown * wm97xx_get_gpio - Get the status of a codec GPIO. 161febf1dffSMark Brown * @wm: wm97xx device. 162febf1dffSMark Brown * @gpio: gpio 163febf1dffSMark Brown * 164febf1dffSMark Brown * Get the status of a codec GPIO pin 165febf1dffSMark Brown */ 166febf1dffSMark Brown 167febf1dffSMark Brown enum wm97xx_gpio_status wm97xx_get_gpio(struct wm97xx *wm, u32 gpio) 168febf1dffSMark Brown { 169febf1dffSMark Brown u16 status; 170febf1dffSMark Brown enum wm97xx_gpio_status ret; 171febf1dffSMark Brown 172febf1dffSMark Brown mutex_lock(&wm->codec_mutex); 173febf1dffSMark Brown status = wm97xx_reg_read(wm, AC97_GPIO_STATUS); 174febf1dffSMark Brown 175febf1dffSMark Brown if (status & gpio) 176febf1dffSMark Brown ret = WM97XX_GPIO_HIGH; 177febf1dffSMark Brown else 178febf1dffSMark Brown ret = WM97XX_GPIO_LOW; 179febf1dffSMark Brown 180febf1dffSMark Brown mutex_unlock(&wm->codec_mutex); 181febf1dffSMark Brown return ret; 182febf1dffSMark Brown } 183febf1dffSMark Brown EXPORT_SYMBOL_GPL(wm97xx_get_gpio); 184febf1dffSMark Brown 185febf1dffSMark Brown /** 186febf1dffSMark Brown * wm97xx_set_gpio - Set the status of a codec GPIO. 187febf1dffSMark Brown * @wm: wm97xx device. 188febf1dffSMark Brown * @gpio: gpio 189febf1dffSMark Brown * 190febf1dffSMark Brown * 191febf1dffSMark Brown * Set the status of a codec GPIO pin 192febf1dffSMark Brown */ 193febf1dffSMark Brown 194febf1dffSMark Brown void wm97xx_set_gpio(struct wm97xx *wm, u32 gpio, 195febf1dffSMark Brown enum wm97xx_gpio_status status) 196febf1dffSMark Brown { 197febf1dffSMark Brown u16 reg; 198febf1dffSMark Brown 199febf1dffSMark Brown mutex_lock(&wm->codec_mutex); 200febf1dffSMark Brown reg = wm97xx_reg_read(wm, AC97_GPIO_STATUS); 201febf1dffSMark Brown 202febf1dffSMark Brown if (status & WM97XX_GPIO_HIGH) 203febf1dffSMark Brown reg |= gpio; 204febf1dffSMark Brown else 205febf1dffSMark Brown reg &= ~gpio; 206febf1dffSMark Brown 207febf1dffSMark Brown if (wm->id == WM9712_ID2) 208febf1dffSMark Brown wm97xx_reg_write(wm, AC97_GPIO_STATUS, reg << 1); 209febf1dffSMark Brown else 210febf1dffSMark Brown wm97xx_reg_write(wm, AC97_GPIO_STATUS, reg); 211febf1dffSMark Brown mutex_unlock(&wm->codec_mutex); 212febf1dffSMark Brown } 213febf1dffSMark Brown EXPORT_SYMBOL_GPL(wm97xx_set_gpio); 214febf1dffSMark Brown 215febf1dffSMark Brown /* 216febf1dffSMark Brown * Codec GPIO pin configuration, this sets pin direction, polarity, 217febf1dffSMark Brown * stickyness and wake up. 218febf1dffSMark Brown */ 219febf1dffSMark Brown void wm97xx_config_gpio(struct wm97xx *wm, u32 gpio, enum wm97xx_gpio_dir dir, 220febf1dffSMark Brown enum wm97xx_gpio_pol pol, enum wm97xx_gpio_sticky sticky, 221febf1dffSMark Brown enum wm97xx_gpio_wake wake) 222febf1dffSMark Brown { 223febf1dffSMark Brown u16 reg; 224febf1dffSMark Brown 225febf1dffSMark Brown mutex_lock(&wm->codec_mutex); 226febf1dffSMark Brown reg = wm97xx_reg_read(wm, AC97_GPIO_POLARITY); 227febf1dffSMark Brown 228febf1dffSMark Brown if (pol == WM97XX_GPIO_POL_HIGH) 229febf1dffSMark Brown reg |= gpio; 230febf1dffSMark Brown else 231febf1dffSMark Brown reg &= ~gpio; 232febf1dffSMark Brown 233febf1dffSMark Brown wm97xx_reg_write(wm, AC97_GPIO_POLARITY, reg); 234febf1dffSMark Brown reg = wm97xx_reg_read(wm, AC97_GPIO_STICKY); 235febf1dffSMark Brown 236febf1dffSMark Brown if (sticky == WM97XX_GPIO_STICKY) 237febf1dffSMark Brown reg |= gpio; 238febf1dffSMark Brown else 239febf1dffSMark Brown reg &= ~gpio; 240febf1dffSMark Brown 241febf1dffSMark Brown wm97xx_reg_write(wm, AC97_GPIO_STICKY, reg); 242febf1dffSMark Brown reg = wm97xx_reg_read(wm, AC97_GPIO_WAKEUP); 243febf1dffSMark Brown 244febf1dffSMark Brown if (wake == WM97XX_GPIO_WAKE) 245febf1dffSMark Brown reg |= gpio; 246febf1dffSMark Brown else 247febf1dffSMark Brown reg &= ~gpio; 248febf1dffSMark Brown 249febf1dffSMark Brown wm97xx_reg_write(wm, AC97_GPIO_WAKEUP, reg); 250febf1dffSMark Brown reg = wm97xx_reg_read(wm, AC97_GPIO_CFG); 251febf1dffSMark Brown 252febf1dffSMark Brown if (dir == WM97XX_GPIO_IN) 253febf1dffSMark Brown reg |= gpio; 254febf1dffSMark Brown else 255febf1dffSMark Brown reg &= ~gpio; 256febf1dffSMark Brown 257febf1dffSMark Brown wm97xx_reg_write(wm, AC97_GPIO_CFG, reg); 258febf1dffSMark Brown mutex_unlock(&wm->codec_mutex); 259febf1dffSMark Brown } 260febf1dffSMark Brown EXPORT_SYMBOL_GPL(wm97xx_config_gpio); 261febf1dffSMark Brown 262febf1dffSMark Brown /* 26334d27853SMark Brown * Configure the WM97XX_PRP value to use while system is suspended. 26434d27853SMark Brown * If a value other than 0 is set then WM97xx pen detection will be 26534d27853SMark Brown * left enabled in the configured mode while the system is in suspend, 26634d27853SMark Brown * the device has users and suspend has not been disabled via the 26734d27853SMark Brown * wakeup sysfs entries. 26834d27853SMark Brown * 26934d27853SMark Brown * @wm: WM97xx device to configure 27034d27853SMark Brown * @mode: WM97XX_PRP value to configure while suspended 27134d27853SMark Brown */ 27234d27853SMark Brown void wm97xx_set_suspend_mode(struct wm97xx *wm, u16 mode) 27334d27853SMark Brown { 27434d27853SMark Brown wm->suspend_mode = mode; 27534d27853SMark Brown device_init_wakeup(&wm->input_dev->dev, mode != 0); 27634d27853SMark Brown } 27734d27853SMark Brown EXPORT_SYMBOL_GPL(wm97xx_set_suspend_mode); 27834d27853SMark Brown 27934d27853SMark Brown /* 280febf1dffSMark Brown * Handle a pen down interrupt. 281febf1dffSMark Brown */ 282febf1dffSMark Brown static void wm97xx_pen_irq_worker(struct work_struct *work) 283febf1dffSMark Brown { 284febf1dffSMark Brown struct wm97xx *wm = container_of(work, struct wm97xx, pen_event_work); 285febf1dffSMark Brown int pen_was_down = wm->pen_is_down; 286febf1dffSMark Brown 287febf1dffSMark Brown /* do we need to enable the touch panel reader */ 288febf1dffSMark Brown if (wm->id == WM9705_ID2) { 289febf1dffSMark Brown if (wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER_RD) & 290febf1dffSMark Brown WM97XX_PEN_DOWN) 291febf1dffSMark Brown wm->pen_is_down = 1; 292febf1dffSMark Brown else 293febf1dffSMark Brown wm->pen_is_down = 0; 294febf1dffSMark Brown } else { 295febf1dffSMark Brown u16 status, pol; 296febf1dffSMark Brown mutex_lock(&wm->codec_mutex); 297febf1dffSMark Brown status = wm97xx_reg_read(wm, AC97_GPIO_STATUS); 298febf1dffSMark Brown pol = wm97xx_reg_read(wm, AC97_GPIO_POLARITY); 299febf1dffSMark Brown 300febf1dffSMark Brown if (WM97XX_GPIO_13 & pol & status) { 301febf1dffSMark Brown wm->pen_is_down = 1; 302febf1dffSMark Brown wm97xx_reg_write(wm, AC97_GPIO_POLARITY, pol & 303febf1dffSMark Brown ~WM97XX_GPIO_13); 304febf1dffSMark Brown } else { 305febf1dffSMark Brown wm->pen_is_down = 0; 306febf1dffSMark Brown wm97xx_reg_write(wm, AC97_GPIO_POLARITY, pol | 307febf1dffSMark Brown WM97XX_GPIO_13); 308febf1dffSMark Brown } 309febf1dffSMark Brown 310febf1dffSMark Brown if (wm->id == WM9712_ID2) 311febf1dffSMark Brown wm97xx_reg_write(wm, AC97_GPIO_STATUS, (status & 312febf1dffSMark Brown ~WM97XX_GPIO_13) << 1); 313febf1dffSMark Brown else 314febf1dffSMark Brown wm97xx_reg_write(wm, AC97_GPIO_STATUS, status & 315febf1dffSMark Brown ~WM97XX_GPIO_13); 316febf1dffSMark Brown mutex_unlock(&wm->codec_mutex); 317febf1dffSMark Brown } 318febf1dffSMark Brown 319febf1dffSMark Brown /* If the system is not using continuous mode or it provides a 320febf1dffSMark Brown * pen down operation then we need to schedule polls while the 321febf1dffSMark Brown * pen is down. Otherwise the machine driver is responsible 322febf1dffSMark Brown * for scheduling reads. 323febf1dffSMark Brown */ 324febf1dffSMark Brown if (!wm->mach_ops->acc_enabled || wm->mach_ops->acc_pen_down) { 325febf1dffSMark Brown if (wm->pen_is_down && !pen_was_down) { 326febf1dffSMark Brown /* Data is not availiable immediately on pen down */ 327febf1dffSMark Brown queue_delayed_work(wm->ts_workq, &wm->ts_reader, 1); 328febf1dffSMark Brown } 329febf1dffSMark Brown 330febf1dffSMark Brown /* Let ts_reader report the pen up for debounce. */ 331febf1dffSMark Brown if (!wm->pen_is_down && pen_was_down) 332febf1dffSMark Brown wm->pen_is_down = 1; 333febf1dffSMark Brown } 334febf1dffSMark Brown 335febf1dffSMark Brown if (!wm->pen_is_down && wm->mach_ops->acc_enabled) 336febf1dffSMark Brown wm->mach_ops->acc_pen_up(wm); 337febf1dffSMark Brown 338febf1dffSMark Brown wm->mach_ops->irq_enable(wm, 1); 339febf1dffSMark Brown } 340febf1dffSMark Brown 341febf1dffSMark Brown /* 342febf1dffSMark Brown * Codec PENDOWN irq handler 343febf1dffSMark Brown * 344febf1dffSMark Brown * We have to disable the codec interrupt in the handler because it 345febf1dffSMark Brown * can take upto 1ms to clear the interrupt source. We schedule a task 346d808fbe5SMark Brown * in a work queue to do the actual interaction with the chip. The 347d808fbe5SMark Brown * interrupt is then enabled again in the slow handler when the source 348d808fbe5SMark Brown * has been cleared. 349febf1dffSMark Brown */ 350febf1dffSMark Brown static irqreturn_t wm97xx_pen_interrupt(int irq, void *dev_id) 351febf1dffSMark Brown { 352febf1dffSMark Brown struct wm97xx *wm = dev_id; 353febf1dffSMark Brown 354d808fbe5SMark Brown if (!work_pending(&wm->pen_event_work)) { 355febf1dffSMark Brown wm->mach_ops->irq_enable(wm, 0); 356febf1dffSMark Brown queue_work(wm->ts_workq, &wm->pen_event_work); 357d808fbe5SMark Brown } 358febf1dffSMark Brown 359febf1dffSMark Brown return IRQ_HANDLED; 360febf1dffSMark Brown } 361febf1dffSMark Brown 362febf1dffSMark Brown /* 363febf1dffSMark Brown * initialise pen IRQ handler and workqueue 364febf1dffSMark Brown */ 365febf1dffSMark Brown static int wm97xx_init_pen_irq(struct wm97xx *wm) 366febf1dffSMark Brown { 367febf1dffSMark Brown u16 reg; 368febf1dffSMark Brown 369febf1dffSMark Brown /* If an interrupt is supplied an IRQ enable operation must also be 370febf1dffSMark Brown * provided. */ 371febf1dffSMark Brown BUG_ON(!wm->mach_ops->irq_enable); 372febf1dffSMark Brown 3734f295232SMark Brown if (request_irq(wm->pen_irq, wm97xx_pen_interrupt, IRQF_SHARED, 374febf1dffSMark Brown "wm97xx-pen", wm)) { 375febf1dffSMark Brown dev_err(wm->dev, 376febf1dffSMark Brown "Failed to register pen down interrupt, polling"); 377febf1dffSMark Brown wm->pen_irq = 0; 378febf1dffSMark Brown return -EINVAL; 379febf1dffSMark Brown } 380febf1dffSMark Brown 381febf1dffSMark Brown /* Configure GPIO as interrupt source on WM971x */ 382febf1dffSMark Brown if (wm->id != WM9705_ID2) { 383febf1dffSMark Brown BUG_ON(!wm->mach_ops->irq_gpio); 384febf1dffSMark Brown reg = wm97xx_reg_read(wm, AC97_MISC_AFE); 385febf1dffSMark Brown wm97xx_reg_write(wm, AC97_MISC_AFE, 386febf1dffSMark Brown reg & ~(wm->mach_ops->irq_gpio)); 387febf1dffSMark Brown reg = wm97xx_reg_read(wm, 0x5a); 388febf1dffSMark Brown wm97xx_reg_write(wm, 0x5a, reg & ~0x0001); 389febf1dffSMark Brown } 390febf1dffSMark Brown 391febf1dffSMark Brown return 0; 392febf1dffSMark Brown } 393febf1dffSMark Brown 394febf1dffSMark Brown static int wm97xx_read_samples(struct wm97xx *wm) 395febf1dffSMark Brown { 396febf1dffSMark Brown struct wm97xx_data data; 397febf1dffSMark Brown int rc; 398febf1dffSMark Brown 399febf1dffSMark Brown mutex_lock(&wm->codec_mutex); 400febf1dffSMark Brown 401febf1dffSMark Brown if (wm->mach_ops && wm->mach_ops->acc_enabled) 402febf1dffSMark Brown rc = wm->mach_ops->acc_pen_down(wm); 403febf1dffSMark Brown else 404febf1dffSMark Brown rc = wm->codec->poll_touch(wm, &data); 405febf1dffSMark Brown 406febf1dffSMark Brown if (rc & RC_PENUP) { 407febf1dffSMark Brown if (wm->pen_is_down) { 408febf1dffSMark Brown wm->pen_is_down = 0; 409febf1dffSMark Brown dev_dbg(wm->dev, "pen up\n"); 410febf1dffSMark Brown input_report_abs(wm->input_dev, ABS_PRESSURE, 0); 41165db86acSMike Rapoport input_report_key(wm->input_dev, BTN_TOUCH, 0); 412febf1dffSMark Brown input_sync(wm->input_dev); 413febf1dffSMark Brown } else if (!(rc & RC_AGAIN)) { 414febf1dffSMark Brown /* We need high frequency updates only while 415febf1dffSMark Brown * pen is down, the user never will be able to 416febf1dffSMark Brown * touch screen faster than a few times per 417febf1dffSMark Brown * second... On the other hand, when the user 418febf1dffSMark Brown * is actively working with the touchscreen we 419febf1dffSMark Brown * don't want to lose the quick response. So we 420febf1dffSMark Brown * will slowly increase sleep time after the 421febf1dffSMark Brown * pen is up and quicky restore it to ~one task 422febf1dffSMark Brown * switch when pen is down again. 423febf1dffSMark Brown */ 424febf1dffSMark Brown if (wm->ts_reader_interval < HZ / 10) 425febf1dffSMark Brown wm->ts_reader_interval++; 426febf1dffSMark Brown } 427febf1dffSMark Brown 428febf1dffSMark Brown } else if (rc & RC_VALID) { 429febf1dffSMark Brown dev_dbg(wm->dev, 430febf1dffSMark Brown "pen down: x=%x:%d, y=%x:%d, pressure=%x:%d\n", 431febf1dffSMark Brown data.x >> 12, data.x & 0xfff, data.y >> 12, 432febf1dffSMark Brown data.y & 0xfff, data.p >> 12, data.p & 0xfff); 433febf1dffSMark Brown input_report_abs(wm->input_dev, ABS_X, data.x & 0xfff); 434febf1dffSMark Brown input_report_abs(wm->input_dev, ABS_Y, data.y & 0xfff); 435febf1dffSMark Brown input_report_abs(wm->input_dev, ABS_PRESSURE, data.p & 0xfff); 43665db86acSMike Rapoport input_report_key(wm->input_dev, BTN_TOUCH, 1); 437febf1dffSMark Brown input_sync(wm->input_dev); 438febf1dffSMark Brown wm->pen_is_down = 1; 439febf1dffSMark Brown wm->ts_reader_interval = wm->ts_reader_min_interval; 440febf1dffSMark Brown } else if (rc & RC_PENDOWN) { 441febf1dffSMark Brown dev_dbg(wm->dev, "pen down\n"); 442febf1dffSMark Brown wm->pen_is_down = 1; 443febf1dffSMark Brown wm->ts_reader_interval = wm->ts_reader_min_interval; 444febf1dffSMark Brown } 445febf1dffSMark Brown 446febf1dffSMark Brown mutex_unlock(&wm->codec_mutex); 447febf1dffSMark Brown return rc; 448febf1dffSMark Brown } 449febf1dffSMark Brown 450febf1dffSMark Brown /* 451febf1dffSMark Brown * The touchscreen sample reader. 452febf1dffSMark Brown */ 453febf1dffSMark Brown static void wm97xx_ts_reader(struct work_struct *work) 454febf1dffSMark Brown { 455febf1dffSMark Brown int rc; 456febf1dffSMark Brown struct wm97xx *wm = container_of(work, struct wm97xx, ts_reader.work); 457febf1dffSMark Brown 458febf1dffSMark Brown BUG_ON(!wm->codec); 459febf1dffSMark Brown 460febf1dffSMark Brown do { 461febf1dffSMark Brown rc = wm97xx_read_samples(wm); 462febf1dffSMark Brown } while (rc & RC_AGAIN); 463febf1dffSMark Brown 464febf1dffSMark Brown if (wm->pen_is_down || !wm->pen_irq) 465febf1dffSMark Brown queue_delayed_work(wm->ts_workq, &wm->ts_reader, 466febf1dffSMark Brown wm->ts_reader_interval); 467febf1dffSMark Brown } 468febf1dffSMark Brown 469febf1dffSMark Brown /** 470febf1dffSMark Brown * wm97xx_ts_input_open - Open the touch screen input device. 471febf1dffSMark Brown * @idev: Input device to be opened. 472febf1dffSMark Brown * 473febf1dffSMark Brown * Called by the input sub system to open a wm97xx touchscreen device. 474febf1dffSMark Brown * Starts the touchscreen thread and touch digitiser. 475febf1dffSMark Brown */ 476febf1dffSMark Brown static int wm97xx_ts_input_open(struct input_dev *idev) 477febf1dffSMark Brown { 478febf1dffSMark Brown struct wm97xx *wm = input_get_drvdata(idev); 479febf1dffSMark Brown 480febf1dffSMark Brown wm->ts_workq = create_singlethread_workqueue("kwm97xx"); 481febf1dffSMark Brown if (wm->ts_workq == NULL) { 482febf1dffSMark Brown dev_err(wm->dev, 483febf1dffSMark Brown "Failed to create workqueue\n"); 484febf1dffSMark Brown return -EINVAL; 485febf1dffSMark Brown } 486febf1dffSMark Brown 487febf1dffSMark Brown /* start digitiser */ 488febf1dffSMark Brown if (wm->mach_ops && wm->mach_ops->acc_enabled) 489febf1dffSMark Brown wm->codec->acc_enable(wm, 1); 490febf1dffSMark Brown wm->codec->dig_enable(wm, 1); 491febf1dffSMark Brown 492febf1dffSMark Brown INIT_DELAYED_WORK(&wm->ts_reader, wm97xx_ts_reader); 493febf1dffSMark Brown INIT_WORK(&wm->pen_event_work, wm97xx_pen_irq_worker); 494febf1dffSMark Brown 495febf1dffSMark Brown wm->ts_reader_min_interval = HZ >= 100 ? HZ / 100 : 1; 496febf1dffSMark Brown if (wm->ts_reader_min_interval < 1) 497febf1dffSMark Brown wm->ts_reader_min_interval = 1; 498febf1dffSMark Brown wm->ts_reader_interval = wm->ts_reader_min_interval; 499febf1dffSMark Brown 500febf1dffSMark Brown wm->pen_is_down = 0; 501febf1dffSMark Brown if (wm->pen_irq) 502febf1dffSMark Brown wm97xx_init_pen_irq(wm); 503febf1dffSMark Brown else 504febf1dffSMark Brown dev_err(wm->dev, "No IRQ specified\n"); 505febf1dffSMark Brown 506febf1dffSMark Brown /* If we either don't have an interrupt for pen down events or 507febf1dffSMark Brown * failed to acquire it then we need to poll. 508febf1dffSMark Brown */ 509febf1dffSMark Brown if (wm->pen_irq == 0) 510febf1dffSMark Brown queue_delayed_work(wm->ts_workq, &wm->ts_reader, 511febf1dffSMark Brown wm->ts_reader_interval); 512febf1dffSMark Brown 513febf1dffSMark Brown return 0; 514febf1dffSMark Brown } 515febf1dffSMark Brown 516febf1dffSMark Brown /** 517febf1dffSMark Brown * wm97xx_ts_input_close - Close the touch screen input device. 518febf1dffSMark Brown * @idev: Input device to be closed. 519febf1dffSMark Brown * 520febf1dffSMark Brown * Called by the input sub system to close a wm97xx touchscreen 521febf1dffSMark Brown * device. Kills the touchscreen thread and stops the touch 522febf1dffSMark Brown * digitiser. 523febf1dffSMark Brown */ 524febf1dffSMark Brown 525febf1dffSMark Brown static void wm97xx_ts_input_close(struct input_dev *idev) 526febf1dffSMark Brown { 527febf1dffSMark Brown struct wm97xx *wm = input_get_drvdata(idev); 528febf1dffSMark Brown u16 reg; 529febf1dffSMark Brown 530febf1dffSMark Brown if (wm->pen_irq) { 531febf1dffSMark Brown /* Return the interrupt to GPIO usage (disabling it) */ 532febf1dffSMark Brown if (wm->id != WM9705_ID2) { 533febf1dffSMark Brown BUG_ON(!wm->mach_ops->irq_gpio); 534febf1dffSMark Brown reg = wm97xx_reg_read(wm, AC97_MISC_AFE); 535febf1dffSMark Brown wm97xx_reg_write(wm, AC97_MISC_AFE, 536febf1dffSMark Brown reg | wm->mach_ops->irq_gpio); 537febf1dffSMark Brown } 538febf1dffSMark Brown 539febf1dffSMark Brown free_irq(wm->pen_irq, wm); 540febf1dffSMark Brown } 541febf1dffSMark Brown 542febf1dffSMark Brown wm->pen_is_down = 0; 543febf1dffSMark Brown 544febf1dffSMark Brown /* Balance out interrupt disables/enables */ 545febf1dffSMark Brown if (cancel_work_sync(&wm->pen_event_work)) 546febf1dffSMark Brown wm->mach_ops->irq_enable(wm, 1); 547febf1dffSMark Brown 548febf1dffSMark Brown /* ts_reader rearms itself so we need to explicitly stop it 549febf1dffSMark Brown * before we destroy the workqueue. 550febf1dffSMark Brown */ 551febf1dffSMark Brown cancel_delayed_work_sync(&wm->ts_reader); 552febf1dffSMark Brown 553febf1dffSMark Brown destroy_workqueue(wm->ts_workq); 554febf1dffSMark Brown 555febf1dffSMark Brown /* stop digitiser */ 556febf1dffSMark Brown wm->codec->dig_enable(wm, 0); 557febf1dffSMark Brown if (wm->mach_ops && wm->mach_ops->acc_enabled) 558febf1dffSMark Brown wm->codec->acc_enable(wm, 0); 559febf1dffSMark Brown } 560febf1dffSMark Brown 561febf1dffSMark Brown static int wm97xx_probe(struct device *dev) 562febf1dffSMark Brown { 563febf1dffSMark Brown struct wm97xx *wm; 564febf1dffSMark Brown int ret = 0, id = 0; 565febf1dffSMark Brown 566febf1dffSMark Brown wm = kzalloc(sizeof(struct wm97xx), GFP_KERNEL); 567febf1dffSMark Brown if (!wm) 568febf1dffSMark Brown return -ENOMEM; 569febf1dffSMark Brown mutex_init(&wm->codec_mutex); 570febf1dffSMark Brown 571febf1dffSMark Brown wm->dev = dev; 572017596b6SGreg Kroah-Hartman dev_set_drvdata(dev, wm); 573febf1dffSMark Brown wm->ac97 = to_ac97_t(dev); 574febf1dffSMark Brown 575febf1dffSMark Brown /* check that we have a supported codec */ 576febf1dffSMark Brown id = wm97xx_reg_read(wm, AC97_VENDOR_ID1); 577febf1dffSMark Brown if (id != WM97XX_ID1) { 578febf1dffSMark Brown dev_err(dev, "Device with vendor %04x is not a wm97xx\n", id); 579febf1dffSMark Brown ret = -ENODEV; 580febf1dffSMark Brown goto alloc_err; 581febf1dffSMark Brown } 582febf1dffSMark Brown 583febf1dffSMark Brown wm->id = wm97xx_reg_read(wm, AC97_VENDOR_ID2); 584febf1dffSMark Brown 585febf1dffSMark Brown dev_info(wm->dev, "detected a wm97%02x codec\n", wm->id & 0xff); 586febf1dffSMark Brown 587febf1dffSMark Brown switch (wm->id & 0xff) { 588febf1dffSMark Brown #ifdef CONFIG_TOUCHSCREEN_WM9705 589febf1dffSMark Brown case 0x05: 590febf1dffSMark Brown wm->codec = &wm9705_codec; 591febf1dffSMark Brown break; 592febf1dffSMark Brown #endif 593febf1dffSMark Brown #ifdef CONFIG_TOUCHSCREEN_WM9712 594febf1dffSMark Brown case 0x12: 595febf1dffSMark Brown wm->codec = &wm9712_codec; 596febf1dffSMark Brown break; 597febf1dffSMark Brown #endif 598febf1dffSMark Brown #ifdef CONFIG_TOUCHSCREEN_WM9713 599febf1dffSMark Brown case 0x13: 600febf1dffSMark Brown wm->codec = &wm9713_codec; 601febf1dffSMark Brown break; 602febf1dffSMark Brown #endif 603febf1dffSMark Brown default: 604febf1dffSMark Brown dev_err(wm->dev, "Support for wm97%02x not compiled in.\n", 605febf1dffSMark Brown wm->id & 0xff); 606febf1dffSMark Brown ret = -ENODEV; 607febf1dffSMark Brown goto alloc_err; 608febf1dffSMark Brown } 609febf1dffSMark Brown 6105de4cd43SMark Brown /* set up physical characteristics */ 6115de4cd43SMark Brown wm->codec->phy_init(wm); 6125de4cd43SMark Brown 6135de4cd43SMark Brown /* load gpio cache */ 6145de4cd43SMark Brown wm->gpio[0] = wm97xx_reg_read(wm, AC97_GPIO_CFG); 6155de4cd43SMark Brown wm->gpio[1] = wm97xx_reg_read(wm, AC97_GPIO_POLARITY); 6165de4cd43SMark Brown wm->gpio[2] = wm97xx_reg_read(wm, AC97_GPIO_STICKY); 6175de4cd43SMark Brown wm->gpio[3] = wm97xx_reg_read(wm, AC97_GPIO_WAKEUP); 6185de4cd43SMark Brown wm->gpio[4] = wm97xx_reg_read(wm, AC97_GPIO_STATUS); 6195de4cd43SMark Brown wm->gpio[5] = wm97xx_reg_read(wm, AC97_MISC_AFE); 6205de4cd43SMark Brown 621febf1dffSMark Brown wm->input_dev = input_allocate_device(); 622febf1dffSMark Brown if (wm->input_dev == NULL) { 623febf1dffSMark Brown ret = -ENOMEM; 624febf1dffSMark Brown goto alloc_err; 625febf1dffSMark Brown } 626febf1dffSMark Brown 627febf1dffSMark Brown /* set up touch configuration */ 628febf1dffSMark Brown wm->input_dev->name = "wm97xx touchscreen"; 6296b32ca39SMark Brown wm->input_dev->phys = "wm97xx"; 630febf1dffSMark Brown wm->input_dev->open = wm97xx_ts_input_open; 631febf1dffSMark Brown wm->input_dev->close = wm97xx_ts_input_close; 63265db86acSMike Rapoport 63365db86acSMike Rapoport __set_bit(EV_ABS, wm->input_dev->evbit); 63465db86acSMike Rapoport __set_bit(EV_KEY, wm->input_dev->evbit); 63565db86acSMike Rapoport __set_bit(BTN_TOUCH, wm->input_dev->keybit); 63665db86acSMike Rapoport 637febf1dffSMark Brown input_set_abs_params(wm->input_dev, ABS_X, abs_x[0], abs_x[1], 638febf1dffSMark Brown abs_x[2], 0); 639febf1dffSMark Brown input_set_abs_params(wm->input_dev, ABS_Y, abs_y[0], abs_y[1], 640febf1dffSMark Brown abs_y[2], 0); 641febf1dffSMark Brown input_set_abs_params(wm->input_dev, ABS_PRESSURE, abs_p[0], abs_p[1], 642febf1dffSMark Brown abs_p[2], 0); 64365db86acSMike Rapoport 644febf1dffSMark Brown input_set_drvdata(wm->input_dev, wm); 645febf1dffSMark Brown wm->input_dev->dev.parent = dev; 64665db86acSMike Rapoport 647febf1dffSMark Brown ret = input_register_device(wm->input_dev); 648febf1dffSMark Brown if (ret < 0) 649febf1dffSMark Brown goto dev_alloc_err; 650febf1dffSMark Brown 651febf1dffSMark Brown /* register our battery device */ 652febf1dffSMark Brown wm->battery_dev = platform_device_alloc("wm97xx-battery", -1); 653febf1dffSMark Brown if (!wm->battery_dev) { 654febf1dffSMark Brown ret = -ENOMEM; 655febf1dffSMark Brown goto batt_err; 656febf1dffSMark Brown } 657febf1dffSMark Brown platform_set_drvdata(wm->battery_dev, wm); 658febf1dffSMark Brown wm->battery_dev->dev.parent = dev; 659febf1dffSMark Brown ret = platform_device_add(wm->battery_dev); 660febf1dffSMark Brown if (ret < 0) 661febf1dffSMark Brown goto batt_reg_err; 662febf1dffSMark Brown 663febf1dffSMark Brown /* register our extended touch device (for machine specific 664febf1dffSMark Brown * extensions) */ 665febf1dffSMark Brown wm->touch_dev = platform_device_alloc("wm97xx-touch", -1); 666febf1dffSMark Brown if (!wm->touch_dev) { 667febf1dffSMark Brown ret = -ENOMEM; 668febf1dffSMark Brown goto touch_err; 669febf1dffSMark Brown } 670febf1dffSMark Brown platform_set_drvdata(wm->touch_dev, wm); 671febf1dffSMark Brown wm->touch_dev->dev.parent = dev; 672febf1dffSMark Brown ret = platform_device_add(wm->touch_dev); 673febf1dffSMark Brown if (ret < 0) 674febf1dffSMark Brown goto touch_reg_err; 675febf1dffSMark Brown 676febf1dffSMark Brown return ret; 677febf1dffSMark Brown 678febf1dffSMark Brown touch_reg_err: 679febf1dffSMark Brown platform_device_put(wm->touch_dev); 680febf1dffSMark Brown touch_err: 681febf1dffSMark Brown platform_device_unregister(wm->battery_dev); 682febf1dffSMark Brown wm->battery_dev = NULL; 683febf1dffSMark Brown batt_reg_err: 684febf1dffSMark Brown platform_device_put(wm->battery_dev); 685febf1dffSMark Brown batt_err: 686febf1dffSMark Brown input_unregister_device(wm->input_dev); 687febf1dffSMark Brown wm->input_dev = NULL; 688febf1dffSMark Brown dev_alloc_err: 689febf1dffSMark Brown input_free_device(wm->input_dev); 690febf1dffSMark Brown alloc_err: 691febf1dffSMark Brown kfree(wm); 692febf1dffSMark Brown 693febf1dffSMark Brown return ret; 694febf1dffSMark Brown } 695febf1dffSMark Brown 696febf1dffSMark Brown static int wm97xx_remove(struct device *dev) 697febf1dffSMark Brown { 698febf1dffSMark Brown struct wm97xx *wm = dev_get_drvdata(dev); 699febf1dffSMark Brown 700febf1dffSMark Brown platform_device_unregister(wm->battery_dev); 701febf1dffSMark Brown platform_device_unregister(wm->touch_dev); 702febf1dffSMark Brown input_unregister_device(wm->input_dev); 703febf1dffSMark Brown kfree(wm); 704febf1dffSMark Brown 705febf1dffSMark Brown return 0; 706febf1dffSMark Brown } 707febf1dffSMark Brown 708febf1dffSMark Brown #ifdef CONFIG_PM 709febf1dffSMark Brown static int wm97xx_suspend(struct device *dev, pm_message_t state) 710febf1dffSMark Brown { 711febf1dffSMark Brown struct wm97xx *wm = dev_get_drvdata(dev); 71234d27853SMark Brown u16 reg; 71334d27853SMark Brown int suspend_mode; 71434d27853SMark Brown 71534d27853SMark Brown if (device_may_wakeup(&wm->input_dev->dev)) 71634d27853SMark Brown suspend_mode = wm->suspend_mode; 71734d27853SMark Brown else 71834d27853SMark Brown suspend_mode = 0; 719febf1dffSMark Brown 720febf1dffSMark Brown if (wm->input_dev->users) 721febf1dffSMark Brown cancel_delayed_work_sync(&wm->ts_reader); 722febf1dffSMark Brown 72334d27853SMark Brown /* Power down the digitiser (bypassing the cache for resume) */ 72434d27853SMark Brown reg = wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER2); 72534d27853SMark Brown reg &= ~WM97XX_PRP_DET_DIG; 72634d27853SMark Brown if (wm->input_dev->users) 72734d27853SMark Brown reg |= suspend_mode; 72834d27853SMark Brown wm->ac97->bus->ops->write(wm->ac97, AC97_WM97XX_DIGITISER2, reg); 72934d27853SMark Brown 73034d27853SMark Brown /* WM9713 has an additional power bit - turn it off if there 73134d27853SMark Brown * are no users or if suspend mode is zero. */ 73234d27853SMark Brown if (wm->id == WM9713_ID2 && 73334d27853SMark Brown (!wm->input_dev->users || !suspend_mode)) { 73434d27853SMark Brown reg = wm97xx_reg_read(wm, AC97_EXTENDED_MID) | 0x8000; 73534d27853SMark Brown wm97xx_reg_write(wm, AC97_EXTENDED_MID, reg); 73634d27853SMark Brown } 73734d27853SMark Brown 738febf1dffSMark Brown return 0; 739febf1dffSMark Brown } 740febf1dffSMark Brown 741febf1dffSMark Brown static int wm97xx_resume(struct device *dev) 742febf1dffSMark Brown { 743febf1dffSMark Brown struct wm97xx *wm = dev_get_drvdata(dev); 744febf1dffSMark Brown 745febf1dffSMark Brown /* restore digitiser and gpios */ 746febf1dffSMark Brown if (wm->id == WM9713_ID2) { 747febf1dffSMark Brown wm97xx_reg_write(wm, AC97_WM9713_DIG1, wm->dig[0]); 748febf1dffSMark Brown wm97xx_reg_write(wm, 0x5a, wm->misc); 749febf1dffSMark Brown if (wm->input_dev->users) { 750febf1dffSMark Brown u16 reg; 751febf1dffSMark Brown reg = wm97xx_reg_read(wm, AC97_EXTENDED_MID) & 0x7fff; 752febf1dffSMark Brown wm97xx_reg_write(wm, AC97_EXTENDED_MID, reg); 753febf1dffSMark Brown } 754febf1dffSMark Brown } 755febf1dffSMark Brown 756febf1dffSMark Brown wm97xx_reg_write(wm, AC97_WM9713_DIG2, wm->dig[1]); 757febf1dffSMark Brown wm97xx_reg_write(wm, AC97_WM9713_DIG3, wm->dig[2]); 758febf1dffSMark Brown 759febf1dffSMark Brown wm97xx_reg_write(wm, AC97_GPIO_CFG, wm->gpio[0]); 760febf1dffSMark Brown wm97xx_reg_write(wm, AC97_GPIO_POLARITY, wm->gpio[1]); 761febf1dffSMark Brown wm97xx_reg_write(wm, AC97_GPIO_STICKY, wm->gpio[2]); 762febf1dffSMark Brown wm97xx_reg_write(wm, AC97_GPIO_WAKEUP, wm->gpio[3]); 763febf1dffSMark Brown wm97xx_reg_write(wm, AC97_GPIO_STATUS, wm->gpio[4]); 764febf1dffSMark Brown wm97xx_reg_write(wm, AC97_MISC_AFE, wm->gpio[5]); 765febf1dffSMark Brown 766febf1dffSMark Brown if (wm->input_dev->users && !wm->pen_irq) { 767febf1dffSMark Brown wm->ts_reader_interval = wm->ts_reader_min_interval; 768febf1dffSMark Brown queue_delayed_work(wm->ts_workq, &wm->ts_reader, 769febf1dffSMark Brown wm->ts_reader_interval); 770febf1dffSMark Brown } 771febf1dffSMark Brown 772febf1dffSMark Brown return 0; 773febf1dffSMark Brown } 774febf1dffSMark Brown 775febf1dffSMark Brown #else 776febf1dffSMark Brown #define wm97xx_suspend NULL 777febf1dffSMark Brown #define wm97xx_resume NULL 778febf1dffSMark Brown #endif 779febf1dffSMark Brown 780febf1dffSMark Brown /* 781febf1dffSMark Brown * Machine specific operations 782febf1dffSMark Brown */ 783febf1dffSMark Brown int wm97xx_register_mach_ops(struct wm97xx *wm, 784febf1dffSMark Brown struct wm97xx_mach_ops *mach_ops) 785febf1dffSMark Brown { 786febf1dffSMark Brown mutex_lock(&wm->codec_mutex); 787febf1dffSMark Brown if (wm->mach_ops) { 788febf1dffSMark Brown mutex_unlock(&wm->codec_mutex); 789febf1dffSMark Brown return -EINVAL; 790febf1dffSMark Brown } 791febf1dffSMark Brown wm->mach_ops = mach_ops; 792febf1dffSMark Brown mutex_unlock(&wm->codec_mutex); 793febf1dffSMark Brown 794febf1dffSMark Brown return 0; 795febf1dffSMark Brown } 796febf1dffSMark Brown EXPORT_SYMBOL_GPL(wm97xx_register_mach_ops); 797febf1dffSMark Brown 798febf1dffSMark Brown void wm97xx_unregister_mach_ops(struct wm97xx *wm) 799febf1dffSMark Brown { 800febf1dffSMark Brown mutex_lock(&wm->codec_mutex); 801febf1dffSMark Brown wm->mach_ops = NULL; 802febf1dffSMark Brown mutex_unlock(&wm->codec_mutex); 803febf1dffSMark Brown } 804febf1dffSMark Brown EXPORT_SYMBOL_GPL(wm97xx_unregister_mach_ops); 805febf1dffSMark Brown 806febf1dffSMark Brown static struct device_driver wm97xx_driver = { 807ef9db492SMark Brown .name = "wm97xx-ts", 808febf1dffSMark Brown .bus = &ac97_bus_type, 809febf1dffSMark Brown .owner = THIS_MODULE, 810febf1dffSMark Brown .probe = wm97xx_probe, 811febf1dffSMark Brown .remove = wm97xx_remove, 812febf1dffSMark Brown .suspend = wm97xx_suspend, 813febf1dffSMark Brown .resume = wm97xx_resume, 814febf1dffSMark Brown }; 815febf1dffSMark Brown 816febf1dffSMark Brown static int __init wm97xx_init(void) 817febf1dffSMark Brown { 818febf1dffSMark Brown return driver_register(&wm97xx_driver); 819febf1dffSMark Brown } 820febf1dffSMark Brown 821febf1dffSMark Brown static void __exit wm97xx_exit(void) 822febf1dffSMark Brown { 823febf1dffSMark Brown driver_unregister(&wm97xx_driver); 824febf1dffSMark Brown } 825febf1dffSMark Brown 826febf1dffSMark Brown module_init(wm97xx_init); 827febf1dffSMark Brown module_exit(wm97xx_exit); 828febf1dffSMark Brown 829febf1dffSMark Brown /* Module information */ 830b8d055a8SLiam Girdwood MODULE_AUTHOR("Liam Girdwood <lrg@slimlogic.co.uk>"); 831febf1dffSMark Brown MODULE_DESCRIPTION("WM97xx Core - Touch Screen / AUX ADC / GPIO Driver"); 832febf1dffSMark Brown MODULE_LICENSE("GPL"); 833