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authorHans-Christian Egtvedt <hans-christian.egtvedt@atmel.com>2008-07-23 22:38:27 +0400
committerDmitry Torokhov <dmitry.torokhov@gmail.com>2008-07-23 22:41:28 +0400
commit9460b6529d8a0bfabf241ddda8b0e469d219844c (patch)
tree53c1bd90ef0510c661cb52a011bd274983322801 /drivers/input
parent494f685775ee4c2f3db4081209f00ff0633243fc (diff)
downloadlinux-9460b6529d8a0bfabf241ddda8b0e469d219844c.tar.xz
Input: ads7846 - optimize order of calculating Rt in ads7846_rx()
Alter the if expression for calculating Rt. The old implementation would run unnecessary code when the ADS7843 device was used. The patch also fixes the code style to kernel standard. Signed-off-by: Hans-Christian Egtvedt <hans-christian.egtvedt@atmel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
Diffstat (limited to 'drivers/input')
-rw-r--r--drivers/input/touchscreen/ads7846.c10
1 files changed, 5 insertions, 5 deletions
diff --git a/drivers/input/touchscreen/ads7846.c b/drivers/input/touchscreen/ads7846.c
index 4d060321514f..ce6f48c695f5 100644
--- a/drivers/input/touchscreen/ads7846.c
+++ b/drivers/input/touchscreen/ads7846.c
@@ -517,7 +517,9 @@ static void ads7846_rx(void *ads)
if (x == MAX_12BIT)
x = 0;
- if (likely(x && z1)) {
+ if (ts->model == 7843) {
+ Rt = ts->pressure_max / 2;
+ } else if (likely(x && z1)) {
/* compute touch pressure resistance using equation #2 */
Rt = z2;
Rt -= z1;
@@ -525,11 +527,9 @@ static void ads7846_rx(void *ads)
Rt *= ts->x_plate_ohms;
Rt /= z1;
Rt = (Rt + 2047) >> 12;
- } else
+ } else {
Rt = 0;
-
- if (ts->model == 7843)
- Rt = ts->pressure_max / 2;
+ }
/* Sample found inconsistent by debouncing or pressure is beyond
* the maximum. Don't report it to user space, repeat at least