diff options
Diffstat (limited to 'drivers/input/touchscreen/wm97xx-core.c')
| -rw-r--r-- | drivers/input/touchscreen/wm97xx-core.c | 848 |
1 files changed, 848 insertions, 0 deletions
diff --git a/drivers/input/touchscreen/wm97xx-core.c b/drivers/input/touchscreen/wm97xx-core.c new file mode 100644 index 00000000..5dbe73af --- /dev/null +++ b/drivers/input/touchscreen/wm97xx-core.c @@ -0,0 +1,848 @@ +/* + * wm97xx-core.c -- Touch screen driver core for Wolfson WM9705, WM9712 + * and WM9713 AC97 Codecs. + * + * Copyright 2003, 2004, 2005, 2006, 2007, 2008 Wolfson Microelectronics PLC. + * Author: Liam Girdwood <lrg@slimlogic.co.uk> + * Parts Copyright : Ian Molton <spyro@f2s.com> + * Andrew Zabolotny <zap@homelink.ru> + * Russell King <rmk@arm.linux.org.uk> + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the + * Free Software Foundation; either version 2 of the License, or (at your + * option) any later version. + * + * Notes: + * + * Features: + * - supports WM9705, WM9712, WM9713 + * - polling mode + * - continuous mode (arch-dependent) + * - adjustable rpu/dpp settings + * - adjustable pressure current + * - adjustable sample settle delay + * - 4 and 5 wire touchscreens (5 wire is WM9712 only) + * - pen down detection + * - battery monitor + * - sample AUX adcs + * - power management + * - codec GPIO + * - codec event notification + * Todo + * - Support for async sampling control for noisy LCDs. + * + */ + +#include <linux/module.h> +#include <linux/moduleparam.h> +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/delay.h> +#include <linux/string.h> +#include <linux/proc_fs.h> +#include <linux/pm.h> +#include <linux/interrupt.h> +#include <linux/bitops.h> +#include <linux/workqueue.h> +#include <linux/wm97xx.h> +#include <linux/uaccess.h> +#include <linux/io.h> +#include <linux/slab.h> + +#define TS_NAME "wm97xx" +#define WM_CORE_VERSION "1.00" +#define DEFAULT_PRESSURE 0xb0c0 + + +/* + * Touchscreen absolute values + * + * These parameters are used to help the input layer discard out of + * range readings and reduce jitter etc. + * + * o min, max:- indicate the min and max values your touch screen returns + * o fuzz:- use a higher number to reduce jitter + * + * The default values correspond to Mainstone II in QVGA mode + * + * Please read + * Documentation/input/input-programming.txt for more details. + */ + +static int abs_x[3] = {350, 3900, 5}; +module_param_array(abs_x, int, NULL, 0); +MODULE_PARM_DESC(abs_x, "Touchscreen absolute X min, max, fuzz"); + +static int abs_y[3] = {320, 3750, 40}; +module_param_array(abs_y, int, NULL, 0); +MODULE_PARM_DESC(abs_y, "Touchscreen absolute Y min, max, fuzz"); + +static int abs_p[3] = {0, 150, 4}; +module_param_array(abs_p, int, NULL, 0); +MODULE_PARM_DESC(abs_p, "Touchscreen absolute Pressure min, max, fuzz"); + +/* + * wm97xx IO access, all IO locking done by AC97 layer + */ +int wm97xx_reg_read(struct wm97xx *wm, u16 reg) +{ + if (wm->ac97) + return wm->ac97->bus->ops->read(wm->ac97, reg); + else + return -1; +} +EXPORT_SYMBOL_GPL(wm97xx_reg_read); + +void wm97xx_reg_write(struct wm97xx *wm, u16 reg, u16 val) +{ + /* cache digitiser registers */ + if (reg >= AC97_WM9713_DIG1 && reg <= AC97_WM9713_DIG3) + wm->dig[(reg - AC97_WM9713_DIG1) >> 1] = val; + + /* cache gpio regs */ + if (reg >= AC97_GPIO_CFG && reg <= AC97_MISC_AFE) + wm->gpio[(reg - AC97_GPIO_CFG) >> 1] = val; + + /* wm9713 irq reg */ + if (reg == 0x5a) + wm->misc = val; + + if (wm->ac97) + wm->ac97->bus->ops->write(wm->ac97, reg, val); +} +EXPORT_SYMBOL_GPL(wm97xx_reg_write); + +/** + * wm97xx_read_aux_adc - Read the aux adc. + * @wm: wm97xx device. + * @adcsel: codec ADC to be read + * + * Reads the selected AUX ADC. + */ + +int wm97xx_read_aux_adc(struct wm97xx *wm, u16 adcsel) +{ + int power_adc = 0, auxval; + u16 power = 0; + int rc = 0; + int timeout = 0; + + /* get codec */ + mutex_lock(&wm->codec_mutex); + + /* When the touchscreen is not in use, we may have to power up + * the AUX ADC before we can use sample the AUX inputs-> + */ + if (wm->id == WM9713_ID2 && + (power = wm97xx_reg_read(wm, AC97_EXTENDED_MID)) & 0x8000) { + power_adc = 1; + wm97xx_reg_write(wm, AC97_EXTENDED_MID, power & 0x7fff); + } + + /* Prepare the codec for AUX reading */ + wm->codec->aux_prepare(wm); + + /* Turn polling mode on to read AUX ADC */ + wm->pen_probably_down = 1; + + while (rc != RC_VALID && timeout++ < 5) + rc = wm->codec->poll_sample(wm, adcsel, &auxval); + + if (power_adc) + wm97xx_reg_write(wm, AC97_EXTENDED_MID, power | 0x8000); + + wm->codec->dig_restore(wm); + + wm->pen_probably_down = 0; + + if (timeout >= 5) { + dev_err(wm->dev, + "timeout reading auxadc %d, disabling digitiser\n", + adcsel); + wm->codec->dig_enable(wm, false); + } + + mutex_unlock(&wm->codec_mutex); + return (rc == RC_VALID ? auxval & 0xfff : -EBUSY); +} +EXPORT_SYMBOL_GPL(wm97xx_read_aux_adc); + +/** + * wm97xx_get_gpio - Get the status of a codec GPIO. + * @wm: wm97xx device. + * @gpio: gpio + * + * Get the status of a codec GPIO pin + */ + +enum wm97xx_gpio_status wm97xx_get_gpio(struct wm97xx *wm, u32 gpio) +{ + u16 status; + enum wm97xx_gpio_status ret; + + mutex_lock(&wm->codec_mutex); + status = wm97xx_reg_read(wm, AC97_GPIO_STATUS); + + if (status & gpio) + ret = WM97XX_GPIO_HIGH; + else + ret = WM97XX_GPIO_LOW; + + mutex_unlock(&wm->codec_mutex); + return ret; +} +EXPORT_SYMBOL_GPL(wm97xx_get_gpio); + +/** + * wm97xx_set_gpio - Set the status of a codec GPIO. + * @wm: wm97xx device. + * @gpio: gpio + * + * + * Set the status of a codec GPIO pin + */ + +void wm97xx_set_gpio(struct wm97xx *wm, u32 gpio, + enum wm97xx_gpio_status status) +{ + u16 reg; + + mutex_lock(&wm->codec_mutex); + reg = wm97xx_reg_read(wm, AC97_GPIO_STATUS); + + if (status == WM97XX_GPIO_HIGH) + reg |= gpio; + else + reg &= ~gpio; + + if (wm->id == WM9712_ID2 && wm->variant != WM97xx_WM1613) + wm97xx_reg_write(wm, AC97_GPIO_STATUS, reg << 1); + else + wm97xx_reg_write(wm, AC97_GPIO_STATUS, reg); + mutex_unlock(&wm->codec_mutex); +} +EXPORT_SYMBOL_GPL(wm97xx_set_gpio); + +/* + * Codec GPIO pin configuration, this sets pin direction, polarity, + * stickyness and wake up. + */ +void wm97xx_config_gpio(struct wm97xx *wm, u32 gpio, enum wm97xx_gpio_dir dir, + enum wm97xx_gpio_pol pol, enum wm97xx_gpio_sticky sticky, + enum wm97xx_gpio_wake wake) +{ + u16 reg; + + mutex_lock(&wm->codec_mutex); + reg = wm97xx_reg_read(wm, AC97_GPIO_POLARITY); + + if (pol == WM97XX_GPIO_POL_HIGH) + reg |= gpio; + else + reg &= ~gpio; + + wm97xx_reg_write(wm, AC97_GPIO_POLARITY, reg); + reg = wm97xx_reg_read(wm, AC97_GPIO_STICKY); + + if (sticky == WM97XX_GPIO_STICKY) + reg |= gpio; + else + reg &= ~gpio; + + wm97xx_reg_write(wm, AC97_GPIO_STICKY, reg); + reg = wm97xx_reg_read(wm, AC97_GPIO_WAKEUP); + + if (wake == WM97XX_GPIO_WAKE) + reg |= gpio; + else + reg &= ~gpio; + + wm97xx_reg_write(wm, AC97_GPIO_WAKEUP, reg); + reg = wm97xx_reg_read(wm, AC97_GPIO_CFG); + + if (dir == WM97XX_GPIO_IN) + reg |= gpio; + else + reg &= ~gpio; + + wm97xx_reg_write(wm, AC97_GPIO_CFG, reg); + mutex_unlock(&wm->codec_mutex); +} +EXPORT_SYMBOL_GPL(wm97xx_config_gpio); + +/* + * Configure the WM97XX_PRP value to use while system is suspended. + * If a value other than 0 is set then WM97xx pen detection will be + * left enabled in the configured mode while the system is in suspend, + * the device has users and suspend has not been disabled via the + * wakeup sysfs entries. + * + * @wm: WM97xx device to configure + * @mode: WM97XX_PRP value to configure while suspended + */ +void wm97xx_set_suspend_mode(struct wm97xx *wm, u16 mode) +{ + wm->suspend_mode = mode; + device_init_wakeup(&wm->input_dev->dev, mode != 0); +} +EXPORT_SYMBOL_GPL(wm97xx_set_suspend_mode); + +/* + * Handle a pen down interrupt. + */ +static void wm97xx_pen_irq_worker(struct work_struct *work) +{ + struct wm97xx *wm = container_of(work, struct wm97xx, pen_event_work); + int pen_was_down = wm->pen_is_down; + + /* do we need to enable the touch panel reader */ + if (wm->id == WM9705_ID2) { + if (wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER_RD) & + WM97XX_PEN_DOWN) + wm->pen_is_down = 1; + else + wm->pen_is_down = 0; + } else { + u16 status, pol; + mutex_lock(&wm->codec_mutex); + status = wm97xx_reg_read(wm, AC97_GPIO_STATUS); + pol = wm97xx_reg_read(wm, AC97_GPIO_POLARITY); + + if (WM97XX_GPIO_13 & pol & status) { + wm->pen_is_down = 1; + wm97xx_reg_write(wm, AC97_GPIO_POLARITY, pol & + ~WM97XX_GPIO_13); + } else { + wm->pen_is_down = 0; + wm97xx_reg_write(wm, AC97_GPIO_POLARITY, pol | + WM97XX_GPIO_13); + } + + if (wm->id == WM9712_ID2 && wm->variant != WM97xx_WM1613) + wm97xx_reg_write(wm, AC97_GPIO_STATUS, (status & + ~WM97XX_GPIO_13) << 1); + else + wm97xx_reg_write(wm, AC97_GPIO_STATUS, status & + ~WM97XX_GPIO_13); + mutex_unlock(&wm->codec_mutex); + } + + /* If the system is not using continuous mode or it provides a + * pen down operation then we need to schedule polls while the + * pen is down. Otherwise the machine driver is responsible + * for scheduling reads. + */ + if (!wm->mach_ops->acc_enabled || wm->mach_ops->acc_pen_down) { + if (wm->pen_is_down && !pen_was_down) { + /* Data is not available immediately on pen down */ + queue_delayed_work(wm->ts_workq, &wm->ts_reader, 1); + } + + /* Let ts_reader report the pen up for debounce. */ + if (!wm->pen_is_down && pen_was_down) + wm->pen_is_down = 1; + } + + if (!wm->pen_is_down && wm->mach_ops->acc_enabled) + wm->mach_ops->acc_pen_up(wm); + + wm->mach_ops->irq_enable(wm, 1); +} + +/* + * Codec PENDOWN irq handler + * + * We have to disable the codec interrupt in the handler because it + * can take up to 1ms to clear the interrupt source. We schedule a task + * in a work queue to do the actual interaction with the chip. The + * interrupt is then enabled again in the slow handler when the source + * has been cleared. + */ +static irqreturn_t wm97xx_pen_interrupt(int irq, void *dev_id) +{ + struct wm97xx *wm = dev_id; + + if (!work_pending(&wm->pen_event_work)) { + wm->mach_ops->irq_enable(wm, 0); + queue_work(wm->ts_workq, &wm->pen_event_work); + } + + return IRQ_HANDLED; +} + +/* + * initialise pen IRQ handler and workqueue + */ +static int wm97xx_init_pen_irq(struct wm97xx *wm) +{ + u16 reg; + + /* If an interrupt is supplied an IRQ enable operation must also be + * provided. */ + BUG_ON(!wm->mach_ops->irq_enable); + + if (request_irq(wm->pen_irq, wm97xx_pen_interrupt, IRQF_SHARED, + "wm97xx-pen", wm)) { + dev_err(wm->dev, + "Failed to register pen down interrupt, polling"); + wm->pen_irq = 0; + return -EINVAL; + } + + /* Configure GPIO as interrupt source on WM971x */ + if (wm->id != WM9705_ID2) { + BUG_ON(!wm->mach_ops->irq_gpio); + reg = wm97xx_reg_read(wm, AC97_MISC_AFE); + wm97xx_reg_write(wm, AC97_MISC_AFE, + reg & ~(wm->mach_ops->irq_gpio)); + reg = wm97xx_reg_read(wm, 0x5a); + wm97xx_reg_write(wm, 0x5a, reg & ~0x0001); + } + + return 0; +} + +static int wm97xx_read_samples(struct wm97xx *wm) +{ + struct wm97xx_data data; + int rc; + + mutex_lock(&wm->codec_mutex); + + if (wm->mach_ops && wm->mach_ops->acc_enabled) + rc = wm->mach_ops->acc_pen_down(wm); + else + rc = wm->codec->poll_touch(wm, &data); + + if (rc & RC_PENUP) { + if (wm->pen_is_down) { + wm->pen_is_down = 0; + dev_dbg(wm->dev, "pen up\n"); + input_report_abs(wm->input_dev, ABS_PRESSURE, 0); + input_report_key(wm->input_dev, BTN_TOUCH, 0); + input_sync(wm->input_dev); + } else if (!(rc & RC_AGAIN)) { + /* We need high frequency updates only while + * pen is down, the user never will be able to + * touch screen faster than a few times per + * second... On the other hand, when the user + * is actively working with the touchscreen we + * don't want to lose the quick response. So we + * will slowly increase sleep time after the + * pen is up and quicky restore it to ~one task + * switch when pen is down again. + */ + if (wm->ts_reader_interval < HZ / 10) + wm->ts_reader_interval++; + } + + } else if (rc & RC_VALID) { + dev_dbg(wm->dev, + "pen down: x=%x:%d, y=%x:%d, pressure=%x:%d\n", + data.x >> 12, data.x & 0xfff, data.y >> 12, + data.y & 0xfff, data.p >> 12, data.p & 0xfff); + input_report_abs(wm->input_dev, ABS_X, data.x & 0xfff); + input_report_abs(wm->input_dev, ABS_Y, data.y & 0xfff); + input_report_abs(wm->input_dev, ABS_PRESSURE, data.p & 0xfff); + input_report_key(wm->input_dev, BTN_TOUCH, 1); + input_sync(wm->input_dev); + wm->pen_is_down = 1; + wm->ts_reader_interval = wm->ts_reader_min_interval; + } else if (rc & RC_PENDOWN) { + dev_dbg(wm->dev, "pen down\n"); + wm->pen_is_down = 1; + wm->ts_reader_interval = wm->ts_reader_min_interval; + } + + mutex_unlock(&wm->codec_mutex); + return rc; +} + +/* +* The touchscreen sample reader. +*/ +static void wm97xx_ts_reader(struct work_struct *work) +{ + int rc; + struct wm97xx *wm = container_of(work, struct wm97xx, ts_reader.work); + + BUG_ON(!wm->codec); + + do { + rc = wm97xx_read_samples(wm); + } while (rc & RC_AGAIN); + + if (wm->pen_is_down || !wm->pen_irq) + queue_delayed_work(wm->ts_workq, &wm->ts_reader, + wm->ts_reader_interval); +} + +/** + * wm97xx_ts_input_open - Open the touch screen input device. + * @idev: Input device to be opened. + * + * Called by the input sub system to open a wm97xx touchscreen device. + * Starts the touchscreen thread and touch digitiser. + */ +static int wm97xx_ts_input_open(struct input_dev *idev) +{ + struct wm97xx *wm = input_get_drvdata(idev); + + wm->ts_workq = create_singlethread_workqueue("kwm97xx"); + if (wm->ts_workq == NULL) { + dev_err(wm->dev, + "Failed to create workqueue\n"); + return -EINVAL; + } + + /* start digitiser */ + if (wm->mach_ops && wm->mach_ops->acc_enabled) + wm->codec->acc_enable(wm, 1); + wm->codec->dig_enable(wm, 1); + + INIT_DELAYED_WORK(&wm->ts_reader, wm97xx_ts_reader); + INIT_WORK(&wm->pen_event_work, wm97xx_pen_irq_worker); + + wm->ts_reader_min_interval = HZ >= 100 ? HZ / 100 : 1; + if (wm->ts_reader_min_interval < 1) + wm->ts_reader_min_interval = 1; + wm->ts_reader_interval = wm->ts_reader_min_interval; + + wm->pen_is_down = 0; + if (wm->pen_irq) + wm97xx_init_pen_irq(wm); + else + dev_err(wm->dev, "No IRQ specified\n"); + + /* If we either don't have an interrupt for pen down events or + * failed to acquire it then we need to poll. + */ + if (wm->pen_irq == 0) + queue_delayed_work(wm->ts_workq, &wm->ts_reader, + wm->ts_reader_interval); + + return 0; +} + +/** + * wm97xx_ts_input_close - Close the touch screen input device. + * @idev: Input device to be closed. + * + * Called by the input sub system to close a wm97xx touchscreen + * device. Kills the touchscreen thread and stops the touch + * digitiser. + */ + +static void wm97xx_ts_input_close(struct input_dev *idev) +{ + struct wm97xx *wm = input_get_drvdata(idev); + u16 reg; + + if (wm->pen_irq) { + /* Return the interrupt to GPIO usage (disabling it) */ + if (wm->id != WM9705_ID2) { + BUG_ON(!wm->mach_ops->irq_gpio); + reg = wm97xx_reg_read(wm, AC97_MISC_AFE); + wm97xx_reg_write(wm, AC97_MISC_AFE, + reg | wm->mach_ops->irq_gpio); + } + + free_irq(wm->pen_irq, wm); + } + + wm->pen_is_down = 0; + + /* Balance out interrupt disables/enables */ + if (cancel_work_sync(&wm->pen_event_work)) + wm->mach_ops->irq_enable(wm, 1); + + /* ts_reader rearms itself so we need to explicitly stop it + * before we destroy the workqueue. + */ + cancel_delayed_work_sync(&wm->ts_reader); + + destroy_workqueue(wm->ts_workq); + + /* stop digitiser */ + wm->codec->dig_enable(wm, 0); + if (wm->mach_ops && wm->mach_ops->acc_enabled) + wm->codec->acc_enable(wm, 0); +} + +static int wm97xx_probe(struct device *dev) +{ + struct wm97xx *wm; + struct wm97xx_pdata *pdata = dev->platform_data; + int ret = 0, id = 0; + + wm = kzalloc(sizeof(struct wm97xx), GFP_KERNEL); + if (!wm) + return -ENOMEM; + mutex_init(&wm->codec_mutex); + + wm->dev = dev; + dev_set_drvdata(dev, wm); + wm->ac97 = to_ac97_t(dev); + + /* check that we have a supported codec */ + id = wm97xx_reg_read(wm, AC97_VENDOR_ID1); + if (id != WM97XX_ID1) { + dev_err(dev, "Device with vendor %04x is not a wm97xx\n", id); + ret = -ENODEV; + goto alloc_err; + } + + wm->id = wm97xx_reg_read(wm, AC97_VENDOR_ID2); + + wm->variant = WM97xx_GENERIC; + + dev_info(wm->dev, "detected a wm97%02x codec\n", wm->id & 0xff); + + switch (wm->id & 0xff) { +#ifdef CONFIG_TOUCHSCREEN_WM9705 + case 0x05: + wm->codec = &wm9705_codec; + break; +#endif +#ifdef CONFIG_TOUCHSCREEN_WM9712 + case 0x12: + wm->codec = &wm9712_codec; + break; +#endif +#ifdef CONFIG_TOUCHSCREEN_WM9713 + case 0x13: + wm->codec = &wm9713_codec; + break; +#endif + default: + dev_err(wm->dev, "Support for wm97%02x not compiled in.\n", + wm->id & 0xff); + ret = -ENODEV; + goto alloc_err; + } + + /* set up physical characteristics */ + wm->codec->phy_init(wm); + + /* load gpio cache */ + wm->gpio[0] = wm97xx_reg_read(wm, AC97_GPIO_CFG); + wm->gpio[1] = wm97xx_reg_read(wm, AC97_GPIO_POLARITY); + wm->gpio[2] = wm97xx_reg_read(wm, AC97_GPIO_STICKY); + wm->gpio[3] = wm97xx_reg_read(wm, AC97_GPIO_WAKEUP); + wm->gpio[4] = wm97xx_reg_read(wm, AC97_GPIO_STATUS); + wm->gpio[5] = wm97xx_reg_read(wm, AC97_MISC_AFE); + + wm->input_dev = input_allocate_device(); + if (wm->input_dev == NULL) { + ret = -ENOMEM; + goto alloc_err; + } + + /* set up touch configuration */ + wm->input_dev->name = "wm97xx touchscreen"; + wm->input_dev->phys = "wm97xx"; + wm->input_dev->open = wm97xx_ts_input_open; + wm->input_dev->close = wm97xx_ts_input_close; + + __set_bit(EV_ABS, wm->input_dev->evbit); + __set_bit(EV_KEY, wm->input_dev->evbit); + __set_bit(BTN_TOUCH, wm->input_dev->keybit); + + input_set_abs_params(wm->input_dev, ABS_X, abs_x[0], abs_x[1], + abs_x[2], 0); + input_set_abs_params(wm->input_dev, ABS_Y, abs_y[0], abs_y[1], + abs_y[2], 0); + input_set_abs_params(wm->input_dev, ABS_PRESSURE, abs_p[0], abs_p[1], + abs_p[2], 0); + + input_set_drvdata(wm->input_dev, wm); + wm->input_dev->dev.parent = dev; + + ret = input_register_device(wm->input_dev); + if (ret < 0) + goto dev_alloc_err; + + /* register our battery device */ + wm->battery_dev = platform_device_alloc("wm97xx-battery", -1); + if (!wm->battery_dev) { + ret = -ENOMEM; + goto batt_err; + } + platform_set_drvdata(wm->battery_dev, wm); + wm->battery_dev->dev.parent = dev; + wm->battery_dev->dev.platform_data = pdata; + ret = platform_device_add(wm->battery_dev); + if (ret < 0) + goto batt_reg_err; + + /* register our extended touch device (for machine specific + * extensions) */ + wm->touch_dev = platform_device_alloc("wm97xx-touch", -1); + if (!wm->touch_dev) { + ret = -ENOMEM; + goto touch_err; + } + platform_set_drvdata(wm->touch_dev, wm); + wm->touch_dev->dev.parent = dev; + wm->touch_dev->dev.platform_data = pdata; + ret = platform_device_add(wm->touch_dev); + if (ret < 0) + goto touch_reg_err; + + return ret; + + touch_reg_err: + platform_device_put(wm->touch_dev); + touch_err: + platform_device_del(wm->battery_dev); + batt_reg_err: + platform_device_put(wm->battery_dev); + batt_err: + input_unregister_device(wm->input_dev); + wm->input_dev = NULL; + dev_alloc_err: + input_free_device(wm->input_dev); + alloc_err: + kfree(wm); + + return ret; +} + +static int wm97xx_remove(struct device *dev) +{ + struct wm97xx *wm = dev_get_drvdata(dev); + + platform_device_unregister(wm->battery_dev); + platform_device_unregister(wm->touch_dev); + input_unregister_device(wm->input_dev); + kfree(wm); + + return 0; +} + +#ifdef CONFIG_PM +static int wm97xx_suspend(struct device *dev, pm_message_t state) +{ + struct wm97xx *wm = dev_get_drvdata(dev); + u16 reg; + int suspend_mode; + + if (device_may_wakeup(&wm->input_dev->dev)) + suspend_mode = wm->suspend_mode; + else + suspend_mode = 0; + + if (wm->input_dev->users) + cancel_delayed_work_sync(&wm->ts_reader); + + /* Power down the digitiser (bypassing the cache for resume) */ + reg = wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER2); + reg &= ~WM97XX_PRP_DET_DIG; + if (wm->input_dev->users) + reg |= suspend_mode; + wm->ac97->bus->ops->write(wm->ac97, AC97_WM97XX_DIGITISER2, reg); + + /* WM9713 has an additional power bit - turn it off if there + * are no users or if suspend mode is zero. */ + if (wm->id == WM9713_ID2 && + (!wm->input_dev->users || !suspend_mode)) { + reg = wm97xx_reg_read(wm, AC97_EXTENDED_MID) | 0x8000; + wm97xx_reg_write(wm, AC97_EXTENDED_MID, reg); + } + + return 0; +} + +static int wm97xx_resume(struct device *dev) +{ + struct wm97xx *wm = dev_get_drvdata(dev); + + /* restore digitiser and gpios */ + if (wm->id == WM9713_ID2) { + wm97xx_reg_write(wm, AC97_WM9713_DIG1, wm->dig[0]); + wm97xx_reg_write(wm, 0x5a, wm->misc); + if (wm->input_dev->users) { + u16 reg; + reg = wm97xx_reg_read(wm, AC97_EXTENDED_MID) & 0x7fff; + wm97xx_reg_write(wm, AC97_EXTENDED_MID, reg); + } + } + + wm97xx_reg_write(wm, AC97_WM9713_DIG2, wm->dig[1]); + wm97xx_reg_write(wm, AC97_WM9713_DIG3, wm->dig[2]); + + wm97xx_reg_write(wm, AC97_GPIO_CFG, wm->gpio[0]); + wm97xx_reg_write(wm, AC97_GPIO_POLARITY, wm->gpio[1]); + wm97xx_reg_write(wm, AC97_GPIO_STICKY, wm->gpio[2]); + wm97xx_reg_write(wm, AC97_GPIO_WAKEUP, wm->gpio[3]); + wm97xx_reg_write(wm, AC97_GPIO_STATUS, wm->gpio[4]); + wm97xx_reg_write(wm, AC97_MISC_AFE, wm->gpio[5]); + + if (wm->input_dev->users && !wm->pen_irq) { + wm->ts_reader_interval = wm->ts_reader_min_interval; + queue_delayed_work(wm->ts_workq, &wm->ts_reader, + wm->ts_reader_interval); + } + + return 0; +} + +#else +#define wm97xx_suspend NULL +#define wm97xx_resume NULL +#endif + +/* + * Machine specific operations + */ +int wm97xx_register_mach_ops(struct wm97xx *wm, + struct wm97xx_mach_ops *mach_ops) +{ + mutex_lock(&wm->codec_mutex); + if (wm->mach_ops) { + mutex_unlock(&wm->codec_mutex); + return -EINVAL; + } + wm->mach_ops = mach_ops; + mutex_unlock(&wm->codec_mutex); + + return 0; +} +EXPORT_SYMBOL_GPL(wm97xx_register_mach_ops); + +void wm97xx_unregister_mach_ops(struct wm97xx *wm) +{ + mutex_lock(&wm->codec_mutex); + wm->mach_ops = NULL; + mutex_unlock(&wm->codec_mutex); +} +EXPORT_SYMBOL_GPL(wm97xx_unregister_mach_ops); + +static struct device_driver wm97xx_driver = { + .name = "wm97xx-ts", + .bus = &ac97_bus_type, + .owner = THIS_MODULE, + .probe = wm97xx_probe, + .remove = wm97xx_remove, + .suspend = wm97xx_suspend, + .resume = wm97xx_resume, +}; + +static int __init wm97xx_init(void) +{ + return driver_register(&wm97xx_driver); +} + +static void __exit wm97xx_exit(void) +{ + driver_unregister(&wm97xx_driver); +} + +module_init(wm97xx_init); +module_exit(wm97xx_exit); + +/* Module information */ +MODULE_AUTHOR("Liam Girdwood <lrg@slimlogic.co.uk>"); +MODULE_DESCRIPTION("WM97xx Core - Touch Screen / AUX ADC / GPIO Driver"); +MODULE_LICENSE("GPL"); |