[PATCH 2/2] Input: tsc2007 - Add a z1_low_threshhold platform data parameter
flat view
STALE5416d
From: Feng Tang <hidden>
Date: 2011-11-29 08:12:21
Also in:
lkml
Subsystem:
input (keyboard, mouse, joystick, touchscreen) drivers, the rest · Maintainers:
Dmitry Torokhov, Linus Torvalds
This originates from a patch in Meego IVI kernel with the name linux-2.6.37-connext-0027-tsc2007.patch There is no author info excepte a line "From MeeGo [off-list ref]" When integrating tsc2007 on Intel IVI platform, there are a lot of noise data whose z1 value is around 10 which is not a sane "z1". So add a "z1_low_threshhold" to filter those nosie data, to make the device work properly. Signed-off-by: Feng Tang <redacted> --- drivers/input/touchscreen/tsc2007.c | 4 +++- include/linux/i2c/tsc2007.h | 1 + 2 files changed, 4 insertions(+), 1 deletions(-)
diff --git a/drivers/input/touchscreen/tsc2007.c b/drivers/input/touchscreen/tsc2007.c
index 789f216..1bf3503 100644
--- a/drivers/input/touchscreen/tsc2007.c
+++ b/drivers/input/touchscreen/tsc2007.c@@ -72,6 +72,7 @@ struct tsc2007 { u16 model; u16 x_plate_ohms; u16 max_rt; + u16 z1_low_threshhold; unsigned long poll_delay; unsigned long poll_period;
@@ -130,7 +131,7 @@ static u32 tsc2007_calculate_pressure(struct tsc2007 *tsc, struct ts_event *tc) if (tc->x == MAX_12BIT) tc->x = 0; - if (likely(tc->x && tc->z1)) { + if (likely(tc->x && tc->z1 > tsc->z1_low_threshhold)) { /* compute touch pressure resistance using equation #1 */ rt = tc->z2 - tc->z1; rt *= tc->x;
@@ -313,6 +314,7 @@ static int __devinit tsc2007_probe(struct i2c_client *client, ts->model = pdata->model; ts->x_plate_ohms = pdata->x_plate_ohms; ts->max_rt = pdata->max_rt ? : MAX_12BIT; + ts->z1_low_threshhold = pdata->z1_low_threshhold ? : 1; ts->poll_delay = pdata->poll_delay ? : 1; ts->poll_period = pdata->poll_period ? : 1; ts->get_pendown_state = pdata->get_pendown_state;
diff --git a/include/linux/i2c/tsc2007.h b/include/linux/i2c/tsc2007.h
index 506a9f7..638c6c7 100644
--- a/include/linux/i2c/tsc2007.h
+++ b/include/linux/i2c/tsc2007.h@@ -7,6 +7,7 @@ struct tsc2007_platform_data { u16 model; /* 2007. */ u16 x_plate_ohms; /* must be non-zero value */ u16 max_rt; /* max. resistance above which samples are ignored */ + u16 z1_low_threshhold; /* threshhold to prevent some noise data */ unsigned long poll_delay; /* delay (in ms) after pen-down event before polling starts */ unsigned long poll_period; /* time (in ms) between samples */
--
1.7.1