[RFC 1/2] input: mt: Add method to extract the MT slot state
From: Benjamin Tissoires <hidden>
Date: 2011-01-27 10:35:57
Subsystem:
input (keyboard, mouse, joystick, touchscreen) drivers, input multitouch (mt) protocol, the rest · Maintainers:
Dmitry Torokhov, Henrik Rydberg, Linus Torvalds
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 <redacted> Signed-off-by: Benjamin Tissoires <redacted> --- drivers/input/input-mt.c | 32 ++++++++++++++++++++++++++++++++ include/linux/input/mt.h | 1 + 2 files changed, 33 insertions(+), 0 deletions(-)
diff --git a/drivers/input/input-mt.c b/drivers/input/input-mt.c
index c48c81f..5b95e38 100644
--- a/drivers/input/input-mt.c
+++ b/drivers/input/input-mt.c@@ -168,3 +168,35 @@ void input_mt_report_pointer_emulation(struct input_dev *dev, bool use_count) } } EXPORT_SYMBOL(input_mt_report_pointer_emulation); + +/** + * input_mt_get_absinfo - 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. + */ +struct input_absinfo input_mt_get_absinfo(struct input_dev *dev, unsigned int code, int slot) +{ + unsigned int mtmap = code > ABS_MT_FIRST ? code - ABS_MT_FIRST : 0; + unsigned long flags; + struct input_absinfo retval; + + spin_lock_irqsave(&dev->event_lock, flags); + if (!mtmap) + retval = dev->absinfo[code]; + else if (slot >= 0 && slot < dev->mtsize) { + retval = dev->absinfo[code]; + retval.value = dev->mt[slot].abs[mtmap]; + } else + retval.value = 0; + spin_unlock_irqrestore(&dev->event_lock, flags); + + return retval; +} +EXPORT_SYMBOL(input_mt_get_absinfo);
diff --git a/include/linux/input/mt.h b/include/linux/input/mt.h
index b3ac06a..a71a27f 100644
--- a/include/linux/input/mt.h
+++ b/include/linux/input/mt.h@@ -54,4 +54,5 @@ void input_mt_report_slot_state(struct input_dev *dev, void input_mt_report_finger_count(struct input_dev *dev, int count); void input_mt_report_pointer_emulation(struct input_dev *dev, bool use_count); +struct input_absinfo input_mt_get_absinfo(struct input_dev *dev, unsigned int code, int slot); #endif
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1.7.3.4