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authorHenrik Rydberg <rydberg@euromail.se>2010-10-11 21:20:51 +0200
committerHenrik Rydberg <rydberg@euromail.se>2010-12-16 10:43:46 +0100
commit17c760687f1270af9bd798d938198caa7d5aa3eb (patch)
treec7278f4cc40522ef61ad158774d655343a029599 /drivers
parent80a469e4f4d01ad96447f85cc71a379ec82ffe2d (diff)
downloadlinux-2.6.38-lt-ux500-17c760687f1270af9bd798d938198caa7d5aa3eb.tar.gz
hid: egalax: Add event filtering
Use estimated signal-to-noise ratios to reduce noise and limit the amount of events emitted. Signed-off-by: Jiri Kosina <jkosina@suse.cz> Cc: Stephane Chatty <chatty@enac.fr> Signed-off-by: Henrik Rydberg <rydberg@euromail.se>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/hid/hid-egalax.c16
1 files changed, 10 insertions, 6 deletions
diff --git a/drivers/hid/hid-egalax.c b/drivers/hid/hid-egalax.c
index aac8a6326bb..66b2c5d919a 100644
--- a/drivers/hid/hid-egalax.c
+++ b/drivers/hid/hid-egalax.c
@@ -25,6 +25,10 @@ MODULE_LICENSE("GPL");
#include "hid-ids.h"
+/* estimated signal-to-noise ratios */
+#define SN_MOVE 4096
+#define SN_PRESSURE 32
+
struct egalax_data {
__u16 x, y, z;
__u8 id;
@@ -57,17 +61,17 @@ static int egalax_input_mapping(struct hid_device *hdev, struct hid_input *hi,
field->logical_maximum = 32760;
hid_map_usage(hi, usage, bit, max,
EV_ABS, ABS_MT_POSITION_X);
- set_abs(input, ABS_MT_POSITION_X, field, 0);
+ set_abs(input, ABS_MT_POSITION_X, field, SN_MOVE);
/* touchscreen emulation */
- set_abs(input, ABS_X, field, 0);
+ set_abs(input, ABS_X, field, SN_MOVE);
return 1;
case HID_GD_Y:
field->logical_maximum = 32760;
hid_map_usage(hi, usage, bit, max,
EV_ABS, ABS_MT_POSITION_Y);
- set_abs(input, ABS_MT_POSITION_Y, field, 0);
+ set_abs(input, ABS_MT_POSITION_Y, field, SN_MOVE);
/* touchscreen emulation */
- set_abs(input, ABS_Y, field, 0);
+ set_abs(input, ABS_Y, field, SN_MOVE);
return 1;
}
return 0;
@@ -93,9 +97,9 @@ static int egalax_input_mapping(struct hid_device *hdev, struct hid_input *hi,
field->logical_minimum = 0;
hid_map_usage(hi, usage, bit, max,
EV_ABS, ABS_MT_PRESSURE);
- set_abs(input, ABS_MT_PRESSURE, field, 0);
+ set_abs(input, ABS_MT_PRESSURE, field, SN_PRESSURE);
/* touchscreen emulation */
- set_abs(input, ABS_PRESSURE, field, 0);
+ set_abs(input, ABS_PRESSURE, field, SN_PRESSURE);
return 1;
}
return 0;