From 34d278534db050b93d79175d59a32a70ac25f9b5 Mon Sep 17 00:00:00 2001 From: Mark Brown Date: Thu, 17 Apr 2008 09:24:58 -0400 Subject: [PATCH] Input: wm97xx-core - support use as a wakeup source The WM97xx touch screen controllers can be used to generate a wakeup event when the system is suspended. Provide a new core API call wm97xx_set_suspend_mode() allowing machine drivers to enable this. If no suspend_mode is provided then the touch panel will be powered down when the system is suspended. Signed-off-by: Mark Brown Signed-off-by: Dmitry Torokhov --- drivers/input/touchscreen/wm97xx-core.c | 39 +++++++++++++++++++++++++ include/linux/wm97xx.h | 3 ++ 2 files changed, 42 insertions(+) diff --git a/drivers/input/touchscreen/wm97xx-core.c b/drivers/input/touchscreen/wm97xx-core.c index fec07c28281a..e9c7ea46b6e3 100644 --- a/drivers/input/touchscreen/wm97xx-core.c +++ b/drivers/input/touchscreen/wm97xx-core.c @@ -261,6 +261,23 @@ void wm97xx_config_gpio(struct wm97xx *wm, u32 gpio, enum wm97xx_gpio_dir dir, } 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. */ @@ -689,10 +706,32 @@ static int wm97xx_remove(struct device *dev) 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; } diff --git a/include/linux/wm97xx.h b/include/linux/wm97xx.h index ed01c7df54a3..4d13732e9cf0 100644 --- a/include/linux/wm97xx.h +++ b/include/linux/wm97xx.h @@ -282,6 +282,7 @@ struct wm97xx { unsigned pen_is_down:1; /* Pen is down */ unsigned aux_waiting:1; /* aux measurement waiting */ unsigned pen_probably_down:1; /* used in polling mode */ + u16 suspend_mode; /* PRP in suspend mode */ }; /* @@ -297,6 +298,8 @@ void wm97xx_config_gpio(struct wm97xx *wm, u32 gpio, enum wm97xx_gpio_sticky sticky, enum wm97xx_gpio_wake wake); +void wm97xx_set_suspend_mode(struct wm97xx *wm, u16 mode); + /* codec AC97 IO access */ int wm97xx_reg_read(struct wm97xx *wm, u16 reg); void wm97xx_reg_write(struct wm97xx *wm, u16 reg, u16 val); -- GitLab