[PATCH 2/2] input: Add a detailed multi-touch finger data report protocol (rev2)
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STALE6481d
From: Henrik Rydberg <hidden>
Date: 2008-12-28 22:59:20
Also in:
lkml
Subsystem:
input (keyboard, mouse, joystick, touchscreen) drivers, the rest · Maintainers:
Dmitry Torokhov, Linus Torvalds
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 <redacted> --- drivers/input/input.c | 13 +++++++++++++ include/linux/input.h | 27 +++++++++++++++++++++++++++ 2 files changed, 40 insertions(+), 0 deletions(-)
diff --git a/drivers/input/input.c b/drivers/input/input.c
index 8b865ba..2c2a95e 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 __initdata unsigned int input_abs_bypass_init_data[] = { + 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 };
@@ -165,6 +174,10 @@ 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;
diff --git a/include/linux/input.h b/include/linux/input.h
index 53a1f52..bcfebd9 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
@@ -646,6 +647,19 @@ struct input_absinfo { #define ABS_TOOL_WIDTH 0x1c #define ABS_VOLUME 0x20 #define ABS_MISC 0x28 + +#define ABS_MT_TOUCH 0x30 /* Diameter of touching circle */ +#define ABS_MT_TOUCH_MAJOR 0x30 /* Major axis of touching ellipse */ +#define ABS_MT_TOUCH_MINOR 0x31 /* Minor axis of touching ellipse */ +#define ABS_MT_WIDTH 0x32 /* Diameter of approaching circle */ +#define ABS_MT_WIDTH_MAJOR 0x32 /* Major axis of approaching ellipse */ +#define ABS_MT_WIDTH_MINOR 0x33 /* Minor axis of approaching ellipse */ +#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)
@@ -742,6 +756,14 @@ struct input_absinfo { #define BUS_ATARI 0x1B /* + * MT_TOOL types + */ +#define MT_TOOL_FINGER 0 +#define MT_TOOL_PEN 1 +#define MT_TOOL_MAX 9 +#define MT_TOOL_CNT (MT_TOOL_MAX + 1) + +/* * Values describing the status of a force-feedback effect */ #define FF_STATUS_STOPPED 0x00
@@ -1310,6 +1332,11 @@ 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)