[PATCH 1/2] input: mt: Add method to extract the MT slot state
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From: Henrik Rydberg on 25 May 2010 08:00 This patch adds the function input_mt_get_abs_value(), which may be used to extract the current state of the MT slots. Signed-off-by: Henrik Rydberg <rydberg(a)euromail.se> --- drivers/input/input.c | 31 +++++++++++++++++++++++++++++++ include/linux/input.h | 2 ++ 2 files changed, 33 insertions(+), 0 deletions(-) diff --git a/drivers/input/input.c b/drivers/input/input.c index 9b6d474..24d1105 100644 --- a/drivers/input/input.c +++ b/drivers/input/input.c @@ -659,6 +659,37 @@ static int input_default_setkeycode(struct input_dev *dev, } /** + * input_mt_get_abs_value - retrieve MT state variables from a device slot + * @dev: input device which state is being queried + * @code: ABS code to retrieve + * @slot: slot to retrieve from + * + * Return the ABS state of the given MT slot. If code is not an MT + * event, the corresponding ABS event is returned. + * + * This function may be called by anyone interested in extracting the + * current MT state. Used by evdev handlers. + */ +int input_mt_get_abs_value(struct input_dev *dev, unsigned int code, int slot) +{ + unsigned int mtmap = input_mt_abs_map[code]; + unsigned long flags; + int retval; + + spin_lock_irqsave(&dev->event_lock, flags); + if (!mtmap) + retval = dev->abs[code]; + else if (slot >= 0 && slot < dev->mtsize) + retval = dev->mt[slot].abs[mtmap - 1]; + else + retval = 0; + spin_unlock_irqrestore(&dev->event_lock, flags); + + return retval; +} +EXPORT_SYMBOL(input_mt_get_abs_value); + +/** * input_get_keycode - retrieve keycode currently mapped to a given scancode * @dev: input device which keymap is being queried * @scancode: scancode (or its equivalent for device in question) for which diff --git a/include/linux/input.h b/include/linux/input.h index bea6958..03727d6 100644 --- a/include/linux/input.h +++ b/include/linux/input.h @@ -1436,6 +1436,8 @@ static inline void input_mt_slot(struct input_dev *dev, int slot) input_event(dev, EV_ABS, ABS_MT_SLOT, slot); } +int input_mt_get_abs_value(struct input_dev *dev, unsigned int code, int slot); + void input_set_capability(struct input_dev *dev, unsigned int type, unsigned int code); static inline void input_set_abs_params(struct input_dev *dev, int axis, int min, int max, int fuzz, int flat) -- 1.6.3.3 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ |