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. 6febf1dffSMark Brown * Author: Liam Girdwood 7febf1dffSMark Brown * liam.girdwood@wolfsonmicro.com or linux@wolfsonmicro.com 8febf1dffSMark Brown * Parts Copyright : Ian Molton <spyro@f2s.com> 9febf1dffSMark Brown * Andrew Zabolotny <zap@homelink.ru> 10febf1dffSMark Brown * Russell King <rmk@arm.linux.org.uk> 11febf1dffSMark Brown * 12febf1dffSMark Brown * This program is free software; you can redistribute it and/or modify it 13febf1dffSMark Brown * under the terms of the GNU General Public License as published by the 14febf1dffSMark Brown * Free Software Foundation; either version 2 of the License, or (at your 15febf1dffSMark Brown * option) any later version. 16febf1dffSMark Brown * 17febf1dffSMark Brown * Notes: 18febf1dffSMark Brown * 19febf1dffSMark Brown * Features: 20febf1dffSMark Brown * - supports WM9705, WM9712, WM9713 21febf1dffSMark Brown * - polling mode 22febf1dffSMark Brown * - continuous mode (arch-dependent) 23febf1dffSMark Brown * - adjustable rpu/dpp settings 24febf1dffSMark Brown * - adjustable pressure current 25febf1dffSMark Brown * - adjustable sample settle delay 26febf1dffSMark Brown * - 4 and 5 wire touchscreens (5 wire is WM9712 only) 27febf1dffSMark Brown * - pen down detection 28febf1dffSMark Brown * - battery monitor 29febf1dffSMark Brown * - sample AUX adcs 30febf1dffSMark Brown * - power management 31febf1dffSMark Brown * - codec GPIO 32febf1dffSMark Brown * - codec event notification 33febf1dffSMark Brown * Todo 34febf1dffSMark Brown * - Support for async sampling control for noisy LCDs. 35febf1dffSMark Brown * 36febf1dffSMark Brown */ 37febf1dffSMark Brown 38febf1dffSMark Brown #include <linux/module.h> 39febf1dffSMark Brown #include <linux/moduleparam.h> 40febf1dffSMark Brown #include <linux/version.h> 41febf1dffSMark Brown #include <linux/kernel.h> 42febf1dffSMark Brown #include <linux/init.h> 43febf1dffSMark Brown #include <linux/delay.h> 44febf1dffSMark Brown #include <linux/string.h> 45febf1dffSMark Brown #include <linux/proc_fs.h> 46febf1dffSMark Brown #include <linux/pm.h> 47febf1dffSMark Brown #include <linux/interrupt.h> 48febf1dffSMark Brown #include <linux/bitops.h> 49febf1dffSMark Brown #include <linux/workqueue.h> 50febf1dffSMark Brown #include <linux/wm97xx.h> 51febf1dffSMark Brown #include <linux/uaccess.h> 52febf1dffSMark Brown #include <linux/io.h> 53febf1dffSMark Brown 54febf1dffSMark Brown #define TS_NAME "wm97xx" 55febf1dffSMark Brown #define WM_CORE_VERSION "1.00" 56febf1dffSMark Brown #define DEFAULT_PRESSURE 0xb0c0 57febf1dffSMark Brown 58febf1dffSMark Brown 59febf1dffSMark Brown /* 60febf1dffSMark Brown * Touchscreen absolute values 61febf1dffSMark Brown * 62febf1dffSMark Brown * These parameters are used to help the input layer discard out of 63febf1dffSMark Brown * range readings and reduce jitter etc. 64febf1dffSMark Brown * 65febf1dffSMark Brown * o min, max:- indicate the min and max values your touch screen returns 66febf1dffSMark Brown * o fuzz:- use a higher number to reduce jitter 67febf1dffSMark Brown * 68febf1dffSMark Brown * The default values correspond to Mainstone II in QVGA mode 69febf1dffSMark Brown * 70febf1dffSMark Brown * Please read 71febf1dffSMark Brown * Documentation/input/input-programming.txt for more details. 72febf1dffSMark Brown */ 73febf1dffSMark Brown 74febf1dffSMark Brown static int abs_x[3] = {350, 3900, 5}; 75febf1dffSMark Brown module_param_array(abs_x, int, NULL, 0); 76febf1dffSMark Brown MODULE_PARM_DESC(abs_x, "Touchscreen absolute X min, max, fuzz"); 77febf1dffSMark Brown 78febf1dffSMark Brown static int abs_y[3] = {320, 3750, 40}; 79febf1dffSMark Brown module_param_array(abs_y, int, NULL, 0); 80febf1dffSMark Brown MODULE_PARM_DESC(abs_y, "Touchscreen absolute Y min, max, fuzz"); 81febf1dffSMark Brown 82febf1dffSMark Brown static int abs_p[3] = {0, 150, 4}; 83febf1dffSMark Brown module_param_array(abs_p, int, NULL, 0); 84febf1dffSMark Brown MODULE_PARM_DESC(abs_p, "Touchscreen absolute Pressure min, max, fuzz"); 85febf1dffSMark Brown 86febf1dffSMark Brown /* 87febf1dffSMark Brown * wm97xx IO access, all IO locking done by AC97 layer 88febf1dffSMark Brown */ 89febf1dffSMark Brown int wm97xx_reg_read(struct wm97xx *wm, u16 reg) 90febf1dffSMark Brown { 91febf1dffSMark Brown if (wm->ac97) 92febf1dffSMark Brown return wm->ac97->bus->ops->read(wm->ac97, reg); 93febf1dffSMark Brown else 94febf1dffSMark Brown return -1; 95febf1dffSMark Brown } 96febf1dffSMark Brown EXPORT_SYMBOL_GPL(wm97xx_reg_read); 97febf1dffSMark Brown 98febf1dffSMark Brown void wm97xx_reg_write(struct wm97xx *wm, u16 reg, u16 val) 99febf1dffSMark Brown { 100febf1dffSMark Brown /* cache digitiser registers */ 101febf1dffSMark Brown if (reg >= AC97_WM9713_DIG1 && reg <= AC97_WM9713_DIG3) 102febf1dffSMark Brown wm->dig[(reg - AC97_WM9713_DIG1) >> 1] = val; 103febf1dffSMark Brown 104febf1dffSMark Brown /* cache gpio regs */ 105febf1dffSMark Brown if (reg >= AC97_GPIO_CFG && reg <= AC97_MISC_AFE) 106febf1dffSMark Brown wm->gpio[(reg - AC97_GPIO_CFG) >> 1] = val; 107febf1dffSMark Brown 108febf1dffSMark Brown /* wm9713 irq reg */ 109febf1dffSMark Brown if (reg == 0x5a) 110febf1dffSMark Brown wm->misc = val; 111febf1dffSMark Brown 112febf1dffSMark Brown if (wm->ac97) 113febf1dffSMark Brown wm->ac97->bus->ops->write(wm->ac97, reg, val); 114febf1dffSMark Brown } 115febf1dffSMark Brown EXPORT_SYMBOL_GPL(wm97xx_reg_write); 116febf1dffSMark Brown 117febf1dffSMark Brown /** 118febf1dffSMark Brown * wm97xx_read_aux_adc - Read the aux adc. 119febf1dffSMark Brown * @wm: wm97xx device. 120febf1dffSMark Brown * @adcsel: codec ADC to be read 121febf1dffSMark Brown * 122febf1dffSMark Brown * Reads the selected AUX ADC. 123febf1dffSMark Brown */ 124febf1dffSMark Brown 125febf1dffSMark Brown int wm97xx_read_aux_adc(struct wm97xx *wm, u16 adcsel) 126febf1dffSMark Brown { 127febf1dffSMark Brown int power_adc = 0, auxval; 128febf1dffSMark Brown u16 power = 0; 129febf1dffSMark Brown 130febf1dffSMark Brown /* get codec */ 131febf1dffSMark Brown mutex_lock(&wm->codec_mutex); 132febf1dffSMark Brown 133febf1dffSMark Brown /* When the touchscreen is not in use, we may have to power up 134febf1dffSMark Brown * the AUX ADC before we can use sample the AUX inputs-> 135febf1dffSMark Brown */ 136febf1dffSMark Brown if (wm->id == WM9713_ID2 && 137febf1dffSMark Brown (power = wm97xx_reg_read(wm, AC97_EXTENDED_MID)) & 0x8000) { 138febf1dffSMark Brown power_adc = 1; 139febf1dffSMark Brown wm97xx_reg_write(wm, AC97_EXTENDED_MID, power & 0x7fff); 140febf1dffSMark Brown } 141febf1dffSMark Brown 142febf1dffSMark Brown /* Prepare the codec for AUX reading */ 143febf1dffSMark Brown wm->codec->aux_prepare(wm); 144febf1dffSMark Brown 145febf1dffSMark Brown /* Turn polling mode on to read AUX ADC */ 146febf1dffSMark Brown wm->pen_probably_down = 1; 147febf1dffSMark Brown wm->codec->poll_sample(wm, adcsel, &auxval); 148febf1dffSMark Brown 149febf1dffSMark Brown if (power_adc) 150febf1dffSMark Brown wm97xx_reg_write(wm, AC97_EXTENDED_MID, power | 0x8000); 151febf1dffSMark Brown 152febf1dffSMark Brown wm->codec->dig_restore(wm); 153febf1dffSMark Brown 154febf1dffSMark Brown wm->pen_probably_down = 0; 155febf1dffSMark Brown 156febf1dffSMark Brown mutex_unlock(&wm->codec_mutex); 157febf1dffSMark Brown return auxval & 0xfff; 158febf1dffSMark Brown } 159febf1dffSMark Brown EXPORT_SYMBOL_GPL(wm97xx_read_aux_adc); 160febf1dffSMark Brown 161febf1dffSMark Brown /** 162febf1dffSMark Brown * wm97xx_get_gpio - Get the status of a codec GPIO. 163febf1dffSMark Brown * @wm: wm97xx device. 164febf1dffSMark Brown * @gpio: gpio 165febf1dffSMark Brown * 166febf1dffSMark Brown * Get the status of a codec GPIO pin 167febf1dffSMark Brown */ 168febf1dffSMark Brown 169febf1dffSMark Brown enum wm97xx_gpio_status wm97xx_get_gpio(struct wm97xx *wm, u32 gpio) 170febf1dffSMark Brown { 171febf1dffSMark Brown u16 status; 172febf1dffSMark Brown enum wm97xx_gpio_status ret; 173febf1dffSMark Brown 174febf1dffSMark Brown mutex_lock(&wm->codec_mutex); 175febf1dffSMark Brown status = wm97xx_reg_read(wm, AC97_GPIO_STATUS); 176febf1dffSMark Brown 177febf1dffSMark Brown if (status & gpio) 178febf1dffSMark Brown ret = WM97XX_GPIO_HIGH; 179febf1dffSMark Brown else 180febf1dffSMark Brown ret = WM97XX_GPIO_LOW; 181febf1dffSMark Brown 182febf1dffSMark Brown mutex_unlock(&wm->codec_mutex); 183febf1dffSMark Brown return ret; 184febf1dffSMark Brown } 185febf1dffSMark Brown EXPORT_SYMBOL_GPL(wm97xx_get_gpio); 186febf1dffSMark Brown 187febf1dffSMark Brown /** 188febf1dffSMark Brown * wm97xx_set_gpio - Set the status of a codec GPIO. 189febf1dffSMark Brown * @wm: wm97xx device. 190febf1dffSMark Brown * @gpio: gpio 191febf1dffSMark Brown * 192febf1dffSMark Brown * 193febf1dffSMark Brown * Set the status of a codec GPIO pin 194febf1dffSMark Brown */ 195febf1dffSMark Brown 196febf1dffSMark Brown void wm97xx_set_gpio(struct wm97xx *wm, u32 gpio, 197febf1dffSMark Brown enum wm97xx_gpio_status status) 198febf1dffSMark Brown { 199febf1dffSMark Brown u16 reg; 200febf1dffSMark Brown 201febf1dffSMark Brown mutex_lock(&wm->codec_mutex); 202febf1dffSMark Brown reg = wm97xx_reg_read(wm, AC97_GPIO_STATUS); 203febf1dffSMark Brown 204febf1dffSMark Brown if (status & WM97XX_GPIO_HIGH) 205febf1dffSMark Brown reg |= gpio; 206febf1dffSMark Brown else 207febf1dffSMark Brown reg &= ~gpio; 208febf1dffSMark Brown 209febf1dffSMark Brown if (wm->id == WM9712_ID2) 210febf1dffSMark Brown wm97xx_reg_write(wm, AC97_GPIO_STATUS, reg << 1); 211febf1dffSMark Brown else 212febf1dffSMark Brown wm97xx_reg_write(wm, AC97_GPIO_STATUS, reg); 213febf1dffSMark Brown mutex_unlock(&wm->codec_mutex); 214febf1dffSMark Brown } 215febf1dffSMark Brown EXPORT_SYMBOL_GPL(wm97xx_set_gpio); 216febf1dffSMark Brown 217febf1dffSMark Brown /* 218febf1dffSMark Brown * Codec GPIO pin configuration, this sets pin direction, polarity, 219febf1dffSMark Brown * stickyness and wake up. 220febf1dffSMark Brown */ 221febf1dffSMark Brown void wm97xx_config_gpio(struct wm97xx *wm, u32 gpio, enum wm97xx_gpio_dir dir, 222febf1dffSMark Brown enum wm97xx_gpio_pol pol, enum wm97xx_gpio_sticky sticky, 223febf1dffSMark Brown enum wm97xx_gpio_wake wake) 224febf1dffSMark Brown { 225febf1dffSMark Brown u16 reg; 226febf1dffSMark Brown 227febf1dffSMark Brown mutex_lock(&wm->codec_mutex); 228febf1dffSMark Brown reg = wm97xx_reg_read(wm, AC97_GPIO_POLARITY); 229febf1dffSMark Brown 230febf1dffSMark Brown if (pol == WM97XX_GPIO_POL_HIGH) 231febf1dffSMark Brown reg |= gpio; 232febf1dffSMark Brown else 233febf1dffSMark Brown reg &= ~gpio; 234febf1dffSMark Brown 235febf1dffSMark Brown wm97xx_reg_write(wm, AC97_GPIO_POLARITY, reg); 236febf1dffSMark Brown reg = wm97xx_reg_read(wm, AC97_GPIO_STICKY); 237febf1dffSMark Brown 238febf1dffSMark Brown if (sticky == WM97XX_GPIO_STICKY) 239febf1dffSMark Brown reg |= gpio; 240febf1dffSMark Brown else 241febf1dffSMark Brown reg &= ~gpio; 242febf1dffSMark Brown 243febf1dffSMark Brown wm97xx_reg_write(wm, AC97_GPIO_STICKY, reg); 244febf1dffSMark Brown reg = wm97xx_reg_read(wm, AC97_GPIO_WAKEUP); 245febf1dffSMark Brown 246febf1dffSMark Brown if (wake == WM97XX_GPIO_WAKE) 247febf1dffSMark Brown reg |= gpio; 248febf1dffSMark Brown else 249febf1dffSMark Brown reg &= ~gpio; 250febf1dffSMark Brown 251febf1dffSMark Brown wm97xx_reg_write(wm, AC97_GPIO_WAKEUP, reg); 252febf1dffSMark Brown reg = wm97xx_reg_read(wm, AC97_GPIO_CFG); 253febf1dffSMark Brown 254febf1dffSMark Brown if (dir == WM97XX_GPIO_IN) 255febf1dffSMark Brown reg |= gpio; 256febf1dffSMark Brown else 257febf1dffSMark Brown reg &= ~gpio; 258febf1dffSMark Brown 259febf1dffSMark Brown wm97xx_reg_write(wm, AC97_GPIO_CFG, reg); 260febf1dffSMark Brown mutex_unlock(&wm->codec_mutex); 261febf1dffSMark Brown } 262febf1dffSMark Brown EXPORT_SYMBOL_GPL(wm97xx_config_gpio); 263febf1dffSMark Brown 264febf1dffSMark Brown /* 265febf1dffSMark Brown * Handle a pen down interrupt. 266febf1dffSMark Brown */ 267febf1dffSMark Brown static void wm97xx_pen_irq_worker(struct work_struct *work) 268febf1dffSMark Brown { 269febf1dffSMark Brown struct wm97xx *wm = container_of(work, struct wm97xx, pen_event_work); 270febf1dffSMark Brown int pen_was_down = wm->pen_is_down; 271febf1dffSMark Brown 272febf1dffSMark Brown /* do we need to enable the touch panel reader */ 273febf1dffSMark Brown if (wm->id == WM9705_ID2) { 274febf1dffSMark Brown if (wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER_RD) & 275febf1dffSMark Brown WM97XX_PEN_DOWN) 276febf1dffSMark Brown wm->pen_is_down = 1; 277febf1dffSMark Brown else 278febf1dffSMark Brown wm->pen_is_down = 0; 279febf1dffSMark Brown } else { 280febf1dffSMark Brown u16 status, pol; 281febf1dffSMark Brown mutex_lock(&wm->codec_mutex); 282febf1dffSMark Brown status = wm97xx_reg_read(wm, AC97_GPIO_STATUS); 283febf1dffSMark Brown pol = wm97xx_reg_read(wm, AC97_GPIO_POLARITY); 284febf1dffSMark Brown 285febf1dffSMark Brown if (WM97XX_GPIO_13 & pol & status) { 286febf1dffSMark Brown wm->pen_is_down = 1; 287febf1dffSMark Brown wm97xx_reg_write(wm, AC97_GPIO_POLARITY, pol & 288febf1dffSMark Brown ~WM97XX_GPIO_13); 289febf1dffSMark Brown } else { 290febf1dffSMark Brown wm->pen_is_down = 0; 291febf1dffSMark Brown wm97xx_reg_write(wm, AC97_GPIO_POLARITY, pol | 292febf1dffSMark Brown WM97XX_GPIO_13); 293febf1dffSMark Brown } 294febf1dffSMark Brown 295febf1dffSMark Brown if (wm->id == WM9712_ID2) 296febf1dffSMark Brown wm97xx_reg_write(wm, AC97_GPIO_STATUS, (status & 297febf1dffSMark Brown ~WM97XX_GPIO_13) << 1); 298febf1dffSMark Brown else 299febf1dffSMark Brown wm97xx_reg_write(wm, AC97_GPIO_STATUS, status & 300febf1dffSMark Brown ~WM97XX_GPIO_13); 301febf1dffSMark Brown mutex_unlock(&wm->codec_mutex); 302febf1dffSMark Brown } 303febf1dffSMark Brown 304febf1dffSMark Brown /* If the system is not using continuous mode or it provides a 305febf1dffSMark Brown * pen down operation then we need to schedule polls while the 306febf1dffSMark Brown * pen is down. Otherwise the machine driver is responsible 307febf1dffSMark Brown * for scheduling reads. 308febf1dffSMark Brown */ 309febf1dffSMark Brown if (!wm->mach_ops->acc_enabled || wm->mach_ops->acc_pen_down) { 310febf1dffSMark Brown if (wm->pen_is_down && !pen_was_down) { 311febf1dffSMark Brown /* Data is not availiable immediately on pen down */ 312febf1dffSMark Brown queue_delayed_work(wm->ts_workq, &wm->ts_reader, 1); 313febf1dffSMark Brown } 314febf1dffSMark Brown 315febf1dffSMark Brown /* Let ts_reader report the pen up for debounce. */ 316febf1dffSMark Brown if (!wm->pen_is_down && pen_was_down) 317febf1dffSMark Brown wm->pen_is_down = 1; 318febf1dffSMark Brown } 319febf1dffSMark Brown 320febf1dffSMark Brown if (!wm->pen_is_down && wm->mach_ops->acc_enabled) 321febf1dffSMark Brown wm->mach_ops->acc_pen_up(wm); 322febf1dffSMark Brown 323febf1dffSMark Brown wm->mach_ops->irq_enable(wm, 1); 324febf1dffSMark Brown } 325febf1dffSMark Brown 326febf1dffSMark Brown /* 327febf1dffSMark Brown * Codec PENDOWN irq handler 328febf1dffSMark Brown * 329febf1dffSMark Brown * We have to disable the codec interrupt in the handler because it 330febf1dffSMark Brown * can take upto 1ms to clear the interrupt source. We schedule a task 331*d808fbe5SMark Brown * in a work queue to do the actual interaction with the chip. The 332*d808fbe5SMark Brown * interrupt is then enabled again in the slow handler when the source 333*d808fbe5SMark Brown * has been cleared. 334febf1dffSMark Brown */ 335febf1dffSMark Brown static irqreturn_t wm97xx_pen_interrupt(int irq, void *dev_id) 336febf1dffSMark Brown { 337febf1dffSMark Brown struct wm97xx *wm = dev_id; 338febf1dffSMark Brown 339*d808fbe5SMark Brown if (!work_pending(&wm->pen_event_work)) { 340febf1dffSMark Brown wm->mach_ops->irq_enable(wm, 0); 341febf1dffSMark Brown queue_work(wm->ts_workq, &wm->pen_event_work); 342*d808fbe5SMark Brown } 343febf1dffSMark Brown 344febf1dffSMark Brown return IRQ_HANDLED; 345febf1dffSMark Brown } 346febf1dffSMark Brown 347febf1dffSMark Brown /* 348febf1dffSMark Brown * initialise pen IRQ handler and workqueue 349febf1dffSMark Brown */ 350febf1dffSMark Brown static int wm97xx_init_pen_irq(struct wm97xx *wm) 351febf1dffSMark Brown { 352febf1dffSMark Brown u16 reg; 353febf1dffSMark Brown 354febf1dffSMark Brown /* If an interrupt is supplied an IRQ enable operation must also be 355febf1dffSMark Brown * provided. */ 356febf1dffSMark Brown BUG_ON(!wm->mach_ops->irq_enable); 357febf1dffSMark Brown 358febf1dffSMark Brown if (request_irq(wm->pen_irq, wm97xx_pen_interrupt, IRQF_SHARED, 359febf1dffSMark Brown "wm97xx-pen", wm)) { 360febf1dffSMark Brown dev_err(wm->dev, 361febf1dffSMark Brown "Failed to register pen down interrupt, polling"); 362febf1dffSMark Brown wm->pen_irq = 0; 363febf1dffSMark Brown return -EINVAL; 364febf1dffSMark Brown } 365febf1dffSMark Brown 366febf1dffSMark Brown /* Configure GPIO as interrupt source on WM971x */ 367febf1dffSMark Brown if (wm->id != WM9705_ID2) { 368febf1dffSMark Brown BUG_ON(!wm->mach_ops->irq_gpio); 369febf1dffSMark Brown reg = wm97xx_reg_read(wm, AC97_MISC_AFE); 370febf1dffSMark Brown wm97xx_reg_write(wm, AC97_MISC_AFE, 371febf1dffSMark Brown reg & ~(wm->mach_ops->irq_gpio)); 372febf1dffSMark Brown reg = wm97xx_reg_read(wm, 0x5a); 373febf1dffSMark Brown wm97xx_reg_write(wm, 0x5a, reg & ~0x0001); 374febf1dffSMark Brown } 375febf1dffSMark Brown 376febf1dffSMark Brown return 0; 377febf1dffSMark Brown } 378febf1dffSMark Brown 379febf1dffSMark Brown static int wm97xx_read_samples(struct wm97xx *wm) 380febf1dffSMark Brown { 381febf1dffSMark Brown struct wm97xx_data data; 382febf1dffSMark Brown int rc; 383febf1dffSMark Brown 384febf1dffSMark Brown mutex_lock(&wm->codec_mutex); 385febf1dffSMark Brown 386febf1dffSMark Brown if (wm->mach_ops && wm->mach_ops->acc_enabled) 387febf1dffSMark Brown rc = wm->mach_ops->acc_pen_down(wm); 388febf1dffSMark Brown else 389febf1dffSMark Brown rc = wm->codec->poll_touch(wm, &data); 390febf1dffSMark Brown 391febf1dffSMark Brown if (rc & RC_PENUP) { 392febf1dffSMark Brown if (wm->pen_is_down) { 393febf1dffSMark Brown wm->pen_is_down = 0; 394febf1dffSMark Brown dev_dbg(wm->dev, "pen up\n"); 395febf1dffSMark Brown input_report_abs(wm->input_dev, ABS_PRESSURE, 0); 396febf1dffSMark Brown input_sync(wm->input_dev); 397febf1dffSMark Brown } else if (!(rc & RC_AGAIN)) { 398febf1dffSMark Brown /* We need high frequency updates only while 399febf1dffSMark Brown * pen is down, the user never will be able to 400febf1dffSMark Brown * touch screen faster than a few times per 401febf1dffSMark Brown * second... On the other hand, when the user 402febf1dffSMark Brown * is actively working with the touchscreen we 403febf1dffSMark Brown * don't want to lose the quick response. So we 404febf1dffSMark Brown * will slowly increase sleep time after the 405febf1dffSMark Brown * pen is up and quicky restore it to ~one task 406febf1dffSMark Brown * switch when pen is down again. 407febf1dffSMark Brown */ 408febf1dffSMark Brown if (wm->ts_reader_interval < HZ / 10) 409febf1dffSMark Brown wm->ts_reader_interval++; 410febf1dffSMark Brown } 411febf1dffSMark Brown 412febf1dffSMark Brown } else if (rc & RC_VALID) { 413febf1dffSMark Brown dev_dbg(wm->dev, 414febf1dffSMark Brown "pen down: x=%x:%d, y=%x:%d, pressure=%x:%d\n", 415febf1dffSMark Brown data.x >> 12, data.x & 0xfff, data.y >> 12, 416febf1dffSMark Brown data.y & 0xfff, data.p >> 12, data.p & 0xfff); 417febf1dffSMark Brown input_report_abs(wm->input_dev, ABS_X, data.x & 0xfff); 418febf1dffSMark Brown input_report_abs(wm->input_dev, ABS_Y, data.y & 0xfff); 419febf1dffSMark Brown input_report_abs(wm->input_dev, ABS_PRESSURE, data.p & 0xfff); 420febf1dffSMark Brown input_sync(wm->input_dev); 421febf1dffSMark Brown wm->pen_is_down = 1; 422febf1dffSMark Brown wm->ts_reader_interval = wm->ts_reader_min_interval; 423febf1dffSMark Brown } else if (rc & RC_PENDOWN) { 424febf1dffSMark Brown dev_dbg(wm->dev, "pen down\n"); 425febf1dffSMark Brown wm->pen_is_down = 1; 426febf1dffSMark Brown wm->ts_reader_interval = wm->ts_reader_min_interval; 427febf1dffSMark Brown } 428febf1dffSMark Brown 429febf1dffSMark Brown mutex_unlock(&wm->codec_mutex); 430febf1dffSMark Brown return rc; 431febf1dffSMark Brown } 432febf1dffSMark Brown 433febf1dffSMark Brown /* 434febf1dffSMark Brown * The touchscreen sample reader. 435febf1dffSMark Brown */ 436febf1dffSMark Brown static void wm97xx_ts_reader(struct work_struct *work) 437febf1dffSMark Brown { 438febf1dffSMark Brown int rc; 439febf1dffSMark Brown struct wm97xx *wm = container_of(work, struct wm97xx, ts_reader.work); 440febf1dffSMark Brown 441febf1dffSMark Brown BUG_ON(!wm->codec); 442febf1dffSMark Brown 443febf1dffSMark Brown do { 444febf1dffSMark Brown rc = wm97xx_read_samples(wm); 445febf1dffSMark Brown } while (rc & RC_AGAIN); 446febf1dffSMark Brown 447febf1dffSMark Brown if (wm->pen_is_down || !wm->pen_irq) 448febf1dffSMark Brown queue_delayed_work(wm->ts_workq, &wm->ts_reader, 449febf1dffSMark Brown wm->ts_reader_interval); 450febf1dffSMark Brown } 451febf1dffSMark Brown 452febf1dffSMark Brown /** 453febf1dffSMark Brown * wm97xx_ts_input_open - Open the touch screen input device. 454febf1dffSMark Brown * @idev: Input device to be opened. 455febf1dffSMark Brown * 456febf1dffSMark Brown * Called by the input sub system to open a wm97xx touchscreen device. 457febf1dffSMark Brown * Starts the touchscreen thread and touch digitiser. 458febf1dffSMark Brown */ 459febf1dffSMark Brown static int wm97xx_ts_input_open(struct input_dev *idev) 460febf1dffSMark Brown { 461febf1dffSMark Brown struct wm97xx *wm = input_get_drvdata(idev); 462febf1dffSMark Brown 463febf1dffSMark Brown wm->ts_workq = create_singlethread_workqueue("kwm97xx"); 464febf1dffSMark Brown if (wm->ts_workq == NULL) { 465febf1dffSMark Brown dev_err(wm->dev, 466febf1dffSMark Brown "Failed to create workqueue\n"); 467febf1dffSMark Brown return -EINVAL; 468febf1dffSMark Brown } 469febf1dffSMark Brown 470febf1dffSMark Brown /* start digitiser */ 471febf1dffSMark Brown if (wm->mach_ops && wm->mach_ops->acc_enabled) 472febf1dffSMark Brown wm->codec->acc_enable(wm, 1); 473febf1dffSMark Brown wm->codec->dig_enable(wm, 1); 474febf1dffSMark Brown 475febf1dffSMark Brown INIT_DELAYED_WORK(&wm->ts_reader, wm97xx_ts_reader); 476febf1dffSMark Brown INIT_WORK(&wm->pen_event_work, wm97xx_pen_irq_worker); 477febf1dffSMark Brown 478febf1dffSMark Brown wm->ts_reader_min_interval = HZ >= 100 ? HZ / 100 : 1; 479febf1dffSMark Brown if (wm->ts_reader_min_interval < 1) 480febf1dffSMark Brown wm->ts_reader_min_interval = 1; 481febf1dffSMark Brown wm->ts_reader_interval = wm->ts_reader_min_interval; 482febf1dffSMark Brown 483febf1dffSMark Brown wm->pen_is_down = 0; 484febf1dffSMark Brown if (wm->pen_irq) 485febf1dffSMark Brown wm97xx_init_pen_irq(wm); 486febf1dffSMark Brown else 487febf1dffSMark Brown dev_err(wm->dev, "No IRQ specified\n"); 488febf1dffSMark Brown 489febf1dffSMark Brown /* If we either don't have an interrupt for pen down events or 490febf1dffSMark Brown * failed to acquire it then we need to poll. 491febf1dffSMark Brown */ 492febf1dffSMark Brown if (wm->pen_irq == 0) 493febf1dffSMark Brown queue_delayed_work(wm->ts_workq, &wm->ts_reader, 494febf1dffSMark Brown wm->ts_reader_interval); 495febf1dffSMark Brown 496febf1dffSMark Brown return 0; 497febf1dffSMark Brown } 498febf1dffSMark Brown 499febf1dffSMark Brown /** 500febf1dffSMark Brown * wm97xx_ts_input_close - Close the touch screen input device. 501febf1dffSMark Brown * @idev: Input device to be closed. 502febf1dffSMark Brown * 503febf1dffSMark Brown * Called by the input sub system to close a wm97xx touchscreen 504febf1dffSMark Brown * device. Kills the touchscreen thread and stops the touch 505febf1dffSMark Brown * digitiser. 506febf1dffSMark Brown */ 507febf1dffSMark Brown 508febf1dffSMark Brown static void wm97xx_ts_input_close(struct input_dev *idev) 509febf1dffSMark Brown { 510febf1dffSMark Brown struct wm97xx *wm = input_get_drvdata(idev); 511febf1dffSMark Brown u16 reg; 512febf1dffSMark Brown 513febf1dffSMark Brown if (wm->pen_irq) { 514febf1dffSMark Brown /* Return the interrupt to GPIO usage (disabling it) */ 515febf1dffSMark Brown if (wm->id != WM9705_ID2) { 516febf1dffSMark Brown BUG_ON(!wm->mach_ops->irq_gpio); 517febf1dffSMark Brown reg = wm97xx_reg_read(wm, AC97_MISC_AFE); 518febf1dffSMark Brown wm97xx_reg_write(wm, AC97_MISC_AFE, 519febf1dffSMark Brown reg | wm->mach_ops->irq_gpio); 520febf1dffSMark Brown } 521febf1dffSMark Brown 522febf1dffSMark Brown free_irq(wm->pen_irq, wm); 523febf1dffSMark Brown } 524febf1dffSMark Brown 525febf1dffSMark Brown wm->pen_is_down = 0; 526febf1dffSMark Brown 527febf1dffSMark Brown /* Balance out interrupt disables/enables */ 528febf1dffSMark Brown if (cancel_work_sync(&wm->pen_event_work)) 529febf1dffSMark Brown wm->mach_ops->irq_enable(wm, 1); 530febf1dffSMark Brown 531febf1dffSMark Brown /* ts_reader rearms itself so we need to explicitly stop it 532febf1dffSMark Brown * before we destroy the workqueue. 533febf1dffSMark Brown */ 534febf1dffSMark Brown cancel_delayed_work_sync(&wm->ts_reader); 535febf1dffSMark Brown 536febf1dffSMark Brown destroy_workqueue(wm->ts_workq); 537febf1dffSMark Brown 538febf1dffSMark Brown /* stop digitiser */ 539febf1dffSMark Brown wm->codec->dig_enable(wm, 0); 540febf1dffSMark Brown if (wm->mach_ops && wm->mach_ops->acc_enabled) 541febf1dffSMark Brown wm->codec->acc_enable(wm, 0); 542febf1dffSMark Brown } 543febf1dffSMark Brown 544febf1dffSMark Brown static int wm97xx_probe(struct device *dev) 545febf1dffSMark Brown { 546febf1dffSMark Brown struct wm97xx *wm; 547febf1dffSMark Brown int ret = 0, id = 0; 548febf1dffSMark Brown 549febf1dffSMark Brown wm = kzalloc(sizeof(struct wm97xx), GFP_KERNEL); 550febf1dffSMark Brown if (!wm) 551febf1dffSMark Brown return -ENOMEM; 552febf1dffSMark Brown mutex_init(&wm->codec_mutex); 553febf1dffSMark Brown 554febf1dffSMark Brown wm->dev = dev; 555febf1dffSMark Brown dev->driver_data = wm; 556febf1dffSMark Brown wm->ac97 = to_ac97_t(dev); 557febf1dffSMark Brown 558febf1dffSMark Brown /* check that we have a supported codec */ 559febf1dffSMark Brown id = wm97xx_reg_read(wm, AC97_VENDOR_ID1); 560febf1dffSMark Brown if (id != WM97XX_ID1) { 561febf1dffSMark Brown dev_err(dev, "Device with vendor %04x is not a wm97xx\n", id); 562febf1dffSMark Brown ret = -ENODEV; 563febf1dffSMark Brown goto alloc_err; 564febf1dffSMark Brown } 565febf1dffSMark Brown 566febf1dffSMark Brown wm->id = wm97xx_reg_read(wm, AC97_VENDOR_ID2); 567febf1dffSMark Brown 568febf1dffSMark Brown dev_info(wm->dev, "detected a wm97%02x codec\n", wm->id & 0xff); 569febf1dffSMark Brown 570febf1dffSMark Brown switch (wm->id & 0xff) { 571febf1dffSMark Brown #ifdef CONFIG_TOUCHSCREEN_WM9705 572febf1dffSMark Brown case 0x05: 573febf1dffSMark Brown wm->codec = &wm9705_codec; 574febf1dffSMark Brown break; 575febf1dffSMark Brown #endif 576febf1dffSMark Brown #ifdef CONFIG_TOUCHSCREEN_WM9712 577febf1dffSMark Brown case 0x12: 578febf1dffSMark Brown wm->codec = &wm9712_codec; 579febf1dffSMark Brown break; 580febf1dffSMark Brown #endif 581febf1dffSMark Brown #ifdef CONFIG_TOUCHSCREEN_WM9713 582febf1dffSMark Brown case 0x13: 583febf1dffSMark Brown wm->codec = &wm9713_codec; 584febf1dffSMark Brown break; 585febf1dffSMark Brown #endif 586febf1dffSMark Brown default: 587febf1dffSMark Brown dev_err(wm->dev, "Support for wm97%02x not compiled in.\n", 588febf1dffSMark Brown wm->id & 0xff); 589febf1dffSMark Brown ret = -ENODEV; 590febf1dffSMark Brown goto alloc_err; 591febf1dffSMark Brown } 592febf1dffSMark Brown 593febf1dffSMark Brown wm->input_dev = input_allocate_device(); 594febf1dffSMark Brown if (wm->input_dev == NULL) { 595febf1dffSMark Brown ret = -ENOMEM; 596febf1dffSMark Brown goto alloc_err; 597febf1dffSMark Brown } 598febf1dffSMark Brown 599febf1dffSMark Brown /* set up touch configuration */ 600febf1dffSMark Brown wm->input_dev->name = "wm97xx touchscreen"; 601febf1dffSMark Brown wm->input_dev->open = wm97xx_ts_input_open; 602febf1dffSMark Brown wm->input_dev->close = wm97xx_ts_input_close; 603febf1dffSMark Brown set_bit(EV_ABS, wm->input_dev->evbit); 604febf1dffSMark Brown set_bit(ABS_X, wm->input_dev->absbit); 605febf1dffSMark Brown set_bit(ABS_Y, wm->input_dev->absbit); 606febf1dffSMark Brown set_bit(ABS_PRESSURE, wm->input_dev->absbit); 607febf1dffSMark Brown input_set_abs_params(wm->input_dev, ABS_X, abs_x[0], abs_x[1], 608febf1dffSMark Brown abs_x[2], 0); 609febf1dffSMark Brown input_set_abs_params(wm->input_dev, ABS_Y, abs_y[0], abs_y[1], 610febf1dffSMark Brown abs_y[2], 0); 611febf1dffSMark Brown input_set_abs_params(wm->input_dev, ABS_PRESSURE, abs_p[0], abs_p[1], 612febf1dffSMark Brown abs_p[2], 0); 613febf1dffSMark Brown input_set_drvdata(wm->input_dev, wm); 614febf1dffSMark Brown wm->input_dev->dev.parent = dev; 615febf1dffSMark Brown ret = input_register_device(wm->input_dev); 616febf1dffSMark Brown if (ret < 0) 617febf1dffSMark Brown goto dev_alloc_err; 618febf1dffSMark Brown 619febf1dffSMark Brown /* set up physical characteristics */ 620febf1dffSMark Brown wm->codec->phy_init(wm); 621febf1dffSMark Brown 622febf1dffSMark Brown /* load gpio cache */ 623febf1dffSMark Brown wm->gpio[0] = wm97xx_reg_read(wm, AC97_GPIO_CFG); 624febf1dffSMark Brown wm->gpio[1] = wm97xx_reg_read(wm, AC97_GPIO_POLARITY); 625febf1dffSMark Brown wm->gpio[2] = wm97xx_reg_read(wm, AC97_GPIO_STICKY); 626febf1dffSMark Brown wm->gpio[3] = wm97xx_reg_read(wm, AC97_GPIO_WAKEUP); 627febf1dffSMark Brown wm->gpio[4] = wm97xx_reg_read(wm, AC97_GPIO_STATUS); 628febf1dffSMark Brown wm->gpio[5] = wm97xx_reg_read(wm, AC97_MISC_AFE); 629febf1dffSMark Brown 630febf1dffSMark Brown /* register our battery device */ 631febf1dffSMark Brown wm->battery_dev = platform_device_alloc("wm97xx-battery", -1); 632febf1dffSMark Brown if (!wm->battery_dev) { 633febf1dffSMark Brown ret = -ENOMEM; 634febf1dffSMark Brown goto batt_err; 635febf1dffSMark Brown } 636febf1dffSMark Brown platform_set_drvdata(wm->battery_dev, wm); 637febf1dffSMark Brown wm->battery_dev->dev.parent = dev; 638febf1dffSMark Brown ret = platform_device_add(wm->battery_dev); 639febf1dffSMark Brown if (ret < 0) 640febf1dffSMark Brown goto batt_reg_err; 641febf1dffSMark Brown 642febf1dffSMark Brown /* register our extended touch device (for machine specific 643febf1dffSMark Brown * extensions) */ 644febf1dffSMark Brown wm->touch_dev = platform_device_alloc("wm97xx-touch", -1); 645febf1dffSMark Brown if (!wm->touch_dev) { 646febf1dffSMark Brown ret = -ENOMEM; 647febf1dffSMark Brown goto touch_err; 648febf1dffSMark Brown } 649febf1dffSMark Brown platform_set_drvdata(wm->touch_dev, wm); 650febf1dffSMark Brown wm->touch_dev->dev.parent = dev; 651febf1dffSMark Brown ret = platform_device_add(wm->touch_dev); 652febf1dffSMark Brown if (ret < 0) 653febf1dffSMark Brown goto touch_reg_err; 654febf1dffSMark Brown 655febf1dffSMark Brown return ret; 656febf1dffSMark Brown 657febf1dffSMark Brown touch_reg_err: 658febf1dffSMark Brown platform_device_put(wm->touch_dev); 659febf1dffSMark Brown touch_err: 660febf1dffSMark Brown platform_device_unregister(wm->battery_dev); 661febf1dffSMark Brown wm->battery_dev = NULL; 662febf1dffSMark Brown batt_reg_err: 663febf1dffSMark Brown platform_device_put(wm->battery_dev); 664febf1dffSMark Brown batt_err: 665febf1dffSMark Brown input_unregister_device(wm->input_dev); 666febf1dffSMark Brown wm->input_dev = NULL; 667febf1dffSMark Brown dev_alloc_err: 668febf1dffSMark Brown input_free_device(wm->input_dev); 669febf1dffSMark Brown alloc_err: 670febf1dffSMark Brown kfree(wm); 671febf1dffSMark Brown 672febf1dffSMark Brown return ret; 673febf1dffSMark Brown } 674febf1dffSMark Brown 675febf1dffSMark Brown static int wm97xx_remove(struct device *dev) 676febf1dffSMark Brown { 677febf1dffSMark Brown struct wm97xx *wm = dev_get_drvdata(dev); 678febf1dffSMark Brown 679febf1dffSMark Brown platform_device_unregister(wm->battery_dev); 680febf1dffSMark Brown platform_device_unregister(wm->touch_dev); 681febf1dffSMark Brown input_unregister_device(wm->input_dev); 682febf1dffSMark Brown kfree(wm); 683febf1dffSMark Brown 684febf1dffSMark Brown return 0; 685febf1dffSMark Brown } 686febf1dffSMark Brown 687febf1dffSMark Brown #ifdef CONFIG_PM 688febf1dffSMark Brown static int wm97xx_suspend(struct device *dev, pm_message_t state) 689febf1dffSMark Brown { 690febf1dffSMark Brown struct wm97xx *wm = dev_get_drvdata(dev); 691febf1dffSMark Brown 692febf1dffSMark Brown if (wm->input_dev->users) 693febf1dffSMark Brown cancel_delayed_work_sync(&wm->ts_reader); 694febf1dffSMark Brown 695febf1dffSMark Brown return 0; 696febf1dffSMark Brown } 697febf1dffSMark Brown 698febf1dffSMark Brown static int wm97xx_resume(struct device *dev) 699febf1dffSMark Brown { 700febf1dffSMark Brown struct wm97xx *wm = dev_get_drvdata(dev); 701febf1dffSMark Brown 702febf1dffSMark Brown /* restore digitiser and gpios */ 703febf1dffSMark Brown if (wm->id == WM9713_ID2) { 704febf1dffSMark Brown wm97xx_reg_write(wm, AC97_WM9713_DIG1, wm->dig[0]); 705febf1dffSMark Brown wm97xx_reg_write(wm, 0x5a, wm->misc); 706febf1dffSMark Brown if (wm->input_dev->users) { 707febf1dffSMark Brown u16 reg; 708febf1dffSMark Brown reg = wm97xx_reg_read(wm, AC97_EXTENDED_MID) & 0x7fff; 709febf1dffSMark Brown wm97xx_reg_write(wm, AC97_EXTENDED_MID, reg); 710febf1dffSMark Brown } 711febf1dffSMark Brown } 712febf1dffSMark Brown 713febf1dffSMark Brown wm97xx_reg_write(wm, AC97_WM9713_DIG2, wm->dig[1]); 714febf1dffSMark Brown wm97xx_reg_write(wm, AC97_WM9713_DIG3, wm->dig[2]); 715febf1dffSMark Brown 716febf1dffSMark Brown wm97xx_reg_write(wm, AC97_GPIO_CFG, wm->gpio[0]); 717febf1dffSMark Brown wm97xx_reg_write(wm, AC97_GPIO_POLARITY, wm->gpio[1]); 718febf1dffSMark Brown wm97xx_reg_write(wm, AC97_GPIO_STICKY, wm->gpio[2]); 719febf1dffSMark Brown wm97xx_reg_write(wm, AC97_GPIO_WAKEUP, wm->gpio[3]); 720febf1dffSMark Brown wm97xx_reg_write(wm, AC97_GPIO_STATUS, wm->gpio[4]); 721febf1dffSMark Brown wm97xx_reg_write(wm, AC97_MISC_AFE, wm->gpio[5]); 722febf1dffSMark Brown 723febf1dffSMark Brown if (wm->input_dev->users && !wm->pen_irq) { 724febf1dffSMark Brown wm->ts_reader_interval = wm->ts_reader_min_interval; 725febf1dffSMark Brown queue_delayed_work(wm->ts_workq, &wm->ts_reader, 726febf1dffSMark Brown wm->ts_reader_interval); 727febf1dffSMark Brown } 728febf1dffSMark Brown 729febf1dffSMark Brown return 0; 730febf1dffSMark Brown } 731febf1dffSMark Brown 732febf1dffSMark Brown #else 733febf1dffSMark Brown #define wm97xx_suspend NULL 734febf1dffSMark Brown #define wm97xx_resume NULL 735febf1dffSMark Brown #endif 736febf1dffSMark Brown 737febf1dffSMark Brown /* 738febf1dffSMark Brown * Machine specific operations 739febf1dffSMark Brown */ 740febf1dffSMark Brown int wm97xx_register_mach_ops(struct wm97xx *wm, 741febf1dffSMark Brown struct wm97xx_mach_ops *mach_ops) 742febf1dffSMark Brown { 743febf1dffSMark Brown mutex_lock(&wm->codec_mutex); 744febf1dffSMark Brown if (wm->mach_ops) { 745febf1dffSMark Brown mutex_unlock(&wm->codec_mutex); 746febf1dffSMark Brown return -EINVAL; 747febf1dffSMark Brown } 748febf1dffSMark Brown wm->mach_ops = mach_ops; 749febf1dffSMark Brown mutex_unlock(&wm->codec_mutex); 750febf1dffSMark Brown 751febf1dffSMark Brown return 0; 752febf1dffSMark Brown } 753febf1dffSMark Brown EXPORT_SYMBOL_GPL(wm97xx_register_mach_ops); 754febf1dffSMark Brown 755febf1dffSMark Brown void wm97xx_unregister_mach_ops(struct wm97xx *wm) 756febf1dffSMark Brown { 757febf1dffSMark Brown mutex_lock(&wm->codec_mutex); 758febf1dffSMark Brown wm->mach_ops = NULL; 759febf1dffSMark Brown mutex_unlock(&wm->codec_mutex); 760febf1dffSMark Brown } 761febf1dffSMark Brown EXPORT_SYMBOL_GPL(wm97xx_unregister_mach_ops); 762febf1dffSMark Brown 763febf1dffSMark Brown static struct device_driver wm97xx_driver = { 764febf1dffSMark Brown .name = "ac97", 765febf1dffSMark Brown .bus = &ac97_bus_type, 766febf1dffSMark Brown .owner = THIS_MODULE, 767febf1dffSMark Brown .probe = wm97xx_probe, 768febf1dffSMark Brown .remove = wm97xx_remove, 769febf1dffSMark Brown .suspend = wm97xx_suspend, 770febf1dffSMark Brown .resume = wm97xx_resume, 771febf1dffSMark Brown }; 772febf1dffSMark Brown 773febf1dffSMark Brown static int __init wm97xx_init(void) 774febf1dffSMark Brown { 775febf1dffSMark Brown return driver_register(&wm97xx_driver); 776febf1dffSMark Brown } 777febf1dffSMark Brown 778febf1dffSMark Brown static void __exit wm97xx_exit(void) 779febf1dffSMark Brown { 780febf1dffSMark Brown driver_unregister(&wm97xx_driver); 781febf1dffSMark Brown } 782febf1dffSMark Brown 783febf1dffSMark Brown module_init(wm97xx_init); 784febf1dffSMark Brown module_exit(wm97xx_exit); 785febf1dffSMark Brown 786febf1dffSMark Brown /* Module information */ 787febf1dffSMark Brown MODULE_AUTHOR("Liam Girdwood <liam.girdwood@wolfsonmicro.com>"); 788febf1dffSMark Brown MODULE_DESCRIPTION("WM97xx Core - Touch Screen / AUX ADC / GPIO Driver"); 789febf1dffSMark Brown MODULE_LICENSE("GPL"); 790