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| author | Henrik Rydberg <rydberg@euromail.se> | 2010-10-11 21:20:51 +0200 |
|---|---|---|
| committer | Henrik Rydberg <rydberg@euromail.se> | 2010-12-16 10:43:46 +0100 |
| commit | 17c760687f1270af9bd798d938198caa7d5aa3eb (patch) | |
| tree | c7278f4cc40522ef61ad158774d655343a029599 /drivers/hid | |
| parent | 80a469e4f4d01ad96447f85cc71a379ec82ffe2d (diff) | |
| download | linux-stable-17c760687f1270af9bd798d938198caa7d5aa3eb.tar.gz linux-stable-17c760687f1270af9bd798d938198caa7d5aa3eb.tar.bz2 linux-stable-17c760687f1270af9bd798d938198caa7d5aa3eb.zip | |
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/hid')
| -rw-r--r-- | drivers/hid/hid-egalax.c | 16 |
1 files changed, 10 insertions, 6 deletions
diff --git a/drivers/hid/hid-egalax.c b/drivers/hid/hid-egalax.c index aac8a6326bbd..66b2c5d919af 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; |