path: root/include
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authorHenrik Rydberg <rydberg@euromail.se>2009-04-28 07:47:33 -0700
committerDmitry Torokhov <dmitry.torokhov@gmail.com>2009-04-28 09:36:24 -0700
commit5e5ee686e3c0f8a3cbe9b75c2690326bf91af10d (patch)
treecfa1e26391f1252a8e47fe82cc2a76ef23e95502 /include
parent61994a61bcedf328cb1d6e96c393fc91ce64563d (diff)
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 'include')
1 files changed, 23 insertions, 0 deletions
diff --git a/include/linux/input.h b/include/linux/input.h
index 32cb825939b..0e6ff5de358 100644
--- a/include/linux/input.h
+++ b/include/linux/input.h
@@ -106,6 +106,7 @@ struct input_absinfo {
#define SYN_REPORT 0
#define SYN_CONFIG 1
+#define SYN_MT_REPORT 2
* Keys and buttons
@@ -645,6 +646,17 @@ struct input_absinfo {
#define ABS_TOOL_WIDTH 0x1c
#define ABS_VOLUME 0x20
#define ABS_MISC 0x28
+#define ABS_MT_TOUCH_MAJOR 0x30 /* Major axis of touching ellipse */
+#define ABS_MT_TOUCH_MINOR 0x31 /* Minor axis (omit if circular) */
+#define ABS_MT_WIDTH_MAJOR 0x32 /* Major axis of approaching ellipse */
+#define ABS_MT_WIDTH_MINOR 0x33 /* Minor axis (omit if circular) */
+#define ABS_MT_ORIENTATION 0x34 /* Ellipse orientation */
+#define ABS_MT_POSITION_X 0x35 /* Center X ellipse position */
+#define ABS_MT_POSITION_Y 0x36 /* Center Y ellipse position */
+#define ABS_MT_TOOL_TYPE 0x37 /* Type of touching device */
+#define ABS_MT_BLOB_ID 0x38 /* Group a set of packets as a blob */
#define ABS_MAX 0x3f
#define ABS_CNT (ABS_MAX+1)
@@ -744,6 +756,12 @@ struct input_absinfo {
#define BUS_ATARI 0x1B
+ * MT_TOOL types
+ */
+#define MT_TOOL_FINGER 0
+#define MT_TOOL_PEN 1
* Values describing the status of a force-feedback effect
#define FF_STATUS_STOPPED 0x00
@@ -1312,6 +1330,11 @@ static inline void input_sync(struct input_dev *dev)
input_event(dev, EV_SYN, SYN_REPORT, 0);
+static inline void input_mt_sync(struct input_dev *dev)
+ input_event(dev, EV_SYN, SYN_MT_REPORT, 0);
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)