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author | Henrik Rydberg <rydberg@euromail.se> | 2009-04-28 07:47:33 -0700 |
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committer | Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2009-04-28 09:36:24 -0700 |
commit | 5e5ee686e3c0f8a3cbe9b75c2690326bf91af10d (patch) | |
tree | cfa1e26391f1252a8e47fe82cc2a76ef23e95502 /drivers/input | |
parent | 61994a61bcedf328cb1d6e96c393fc91ce64563d (diff) | |
download | kernel_samsung_tuna-5e5ee686e3c0f8a3cbe9b75c2690326bf91af10d.zip kernel_samsung_tuna-5e5ee686e3c0f8a3cbe9b75c2690326bf91af10d.tar.gz kernel_samsung_tuna-5e5ee686e3c0f8a3cbe9b75c2690326bf91af10d.tar.bz2 |
Input: add detailed multi-touch finger data report protocol
In order to utilize the full power of the new multi-touch devices, a
way to report detailed finger data to user space is needed. This patch
adds a multi-touch (MT) protocol which allows drivers to report details
for an arbitrary number of fingers.
The driver sends a SYN_MT_REPORT event via the input_mt_sync() function
when a complete finger has been reported.
In order to stay compatible with existing applications, the data
reported in a finger packet must not be recognized as single-touch
events. In addition, all finger data must bypass input filtering,
since subsequent events of the same type refer to different fingers.
A set of ABS_MT events with the desired properties are defined. The
events are divided into categories, to allow for partial implementation.
The minimum set consists of ABS_MT_TOUCH_MAJOR, ABS_MT_POSITION_X and
ABS_MT_POSITION_Y, which allows for multiple fingers to be tracked.
If the device supports it, the ABS_MT_WIDTH_MAJOR may be used to provide
the size of the approaching finger. Anisotropy and direction may be
specified with ABS_MT_TOUCH_MINOR, ABS_MT_WIDTH_MINOR and
ABS_MT_ORIENTATION. Devices with more granular information may specify
general shapes as blobs, i.e., as a sequence of rectangular shapes
grouped together by a ABS_MT_BLOB_ID. Finally, the ABS_MT_TOOL_TYPE
may be used to specify whether the touching tool is a finger or a pen.
Signed-off-by: Henrik Rydberg <rydberg@euromail.se>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
Diffstat (limited to 'drivers/input')
-rw-r--r-- | drivers/input/input.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/drivers/input/input.c b/drivers/input/input.c index 8ff92aa..e54e002 100644 --- a/drivers/input/input.c +++ b/drivers/input/input.c @@ -33,6 +33,15 @@ MODULE_LICENSE("GPL"); * EV_ABS events which should not be cached are listed here. */ static unsigned int input_abs_bypass_init_data[] __initdata = { + ABS_MT_TOUCH_MAJOR, + ABS_MT_TOUCH_MINOR, + ABS_MT_WIDTH_MAJOR, + ABS_MT_WIDTH_MINOR, + ABS_MT_ORIENTATION, + ABS_MT_POSITION_X, + ABS_MT_POSITION_Y, + ABS_MT_TOOL_TYPE, + ABS_MT_BLOB_ID, 0 }; static unsigned long input_abs_bypass[BITS_TO_LONGS(ABS_CNT)]; @@ -169,6 +178,10 @@ static void input_handle_event(struct input_dev *dev, disposition = INPUT_PASS_TO_HANDLERS; } break; + case SYN_MT_REPORT: + dev->sync = 0; + disposition = INPUT_PASS_TO_HANDLERS; + break; } break; |