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HID: magicmouse: simplify touch data bit manipulation

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The new format should be easier to read to determine which bits
correspond to which data. It also brings all the manipulation logic to
the top of the function. This makes size and orientation reading more
clear.

Note that the impetus for this change is the forthcoming support for the
Magic Trackpad, which has a different touch data protocol.

Signed-off-by: Chase Douglas <chase.douglas@canonical.com>
Acked-by: Michael Poole <mdpoole@troilus.org>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
Chase Douglas 2010-08-31 21:56:20 -04:00 committed by Jiri Kosina
parent 0773590c89
commit 6de048bf1d
1 changed files with 13 additions and 12 deletions
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25
drivers/hid/hid-magicmouse.c
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@ -158,18 +158,21 @@ static void magicmouse_emit_buttons(struct magicmouse_sc *msc, int state)
static void magicmouse_emit_touch(struct magicmouse_sc *msc, int raw_id, u8 *tdata) static void magicmouse_emit_touch(struct magicmouse_sc *msc, int raw_id, u8 *tdata)
{ {
struct input_dev *input = msc->input; struct input_dev *input = msc->input;
__s32 x_y = tdata[0] << 8 | tdata[1] << 16 | tdata[2] << 24; int id = (tdata[6] << 2 | tdata[5] >> 6) & 0xf;
int misc = tdata[5] | tdata[6] << 8; int x = (tdata[1] << 28 | tdata[0] << 20) >> 20;
int id = (misc >> 6) & 15; int y = -((tdata[2] << 24 | tdata[1] << 16) >> 20);
int x = x_y << 12 >> 20; int size = tdata[5] & 0x3f;
int y = -(x_y >> 20); int orientation = (tdata[6] >> 2) - 32;
int down = (tdata[7] & TOUCH_STATE_MASK) != TOUCH_STATE_NONE; int touch_major = tdata[3];
int touch_minor = tdata[4];
int state = tdata[7] & TOUCH_STATE_MASK;
int down = state != TOUCH_STATE_NONE;
/* Store tracking ID and other fields. */ /* Store tracking ID and other fields. */
msc->tracking_ids[raw_id] = id; msc->tracking_ids[raw_id] = id;
msc->touches[id].x = x; msc->touches[id].x = x;
msc->touches[id].y = y; msc->touches[id].y = y;
msc->touches[id].size = misc & 63; msc->touches[id].size = size;
/* If requested, emulate a scroll wheel by detecting small /* If requested, emulate a scroll wheel by detecting small
* vertical touch motions. * vertical touch motions.
@ -180,7 +183,7 @@ static void magicmouse_emit_touch(struct magicmouse_sc *msc, int raw_id, u8 *tda
int step_y = msc->touches[id].scroll_y - y; int step_y = msc->touches[id].scroll_y - y;
/* Calculate and apply the scroll motion. */ /* Calculate and apply the scroll motion. */
switch (tdata[7] & TOUCH_STATE_MASK) { switch (state) {
case TOUCH_STATE_START: case TOUCH_STATE_START:
msc->touches[id].scroll_x = x; msc->touches[id].scroll_x = x;
msc->touches[id].scroll_y = y; msc->touches[id].scroll_y = y;
@ -216,11 +219,9 @@ static void magicmouse_emit_touch(struct magicmouse_sc *msc, int raw_id, u8 *tda
/* Generate the input events for this touch. */ /* Generate the input events for this touch. */
if (report_touches && down) { if (report_touches && down) {
int orientation = (misc >> 10) - 32;
input_report_abs(input, ABS_MT_TRACKING_ID, id); input_report_abs(input, ABS_MT_TRACKING_ID, id);
input_report_abs(input, ABS_MT_TOUCH_MAJOR, tdata[3]); input_report_abs(input, ABS_MT_TOUCH_MAJOR, touch_major);
input_report_abs(input, ABS_MT_TOUCH_MINOR, tdata[4]); input_report_abs(input, ABS_MT_TOUCH_MINOR, touch_minor);
input_report_abs(input, ABS_MT_ORIENTATION, orientation); input_report_abs(input, ABS_MT_ORIENTATION, orientation);
input_report_abs(input, ABS_MT_POSITION_X, x); input_report_abs(input, ABS_MT_POSITION_X, x);
input_report_abs(input, ABS_MT_POSITION_Y, y); input_report_abs(input, ABS_MT_POSITION_Y, y);