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Date: Wed, 13 Oct 2010 22:30:24 +0200 From: "Henrik Rydberg" <rydberg@...omail.se> To: Jiri Kosina <jkosina@...e.cz> Cc: Dmitry Torokhov <dmitry.torokhov@...il.com>, Philipp Merkel <mail@...lmerk.de>, Stephane Chatty <chatty@...c.fr>, linux-input@...r.kernel.org, linux-kernel@...r.kernel.org, Henrik Rydberg <rydberg@...omail.se> Subject: [PATCH 5/6] hid: egalax: Add event filtering (rev2) Use estimated signal-to-noise ratios to reduce noise and limit the amount of events emitted. Signed-off-by: Henrik Rydberg <rydberg@...omail.se> --- 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 b8025b9..78a2b3e 100644 --- a/drivers/hid/hid-egalax.c +++ b/drivers/hid/hid-egalax.c @@ -27,6 +27,10 @@ MODULE_LICENSE("GPL"); #define MAX_EVENTS 120 +/* estimated signal-to-noise ratios */ +#define SN_MOVE 1024 +#define SN_PRESSURE 32 + struct egalax_data { __u16 x, y, z; __u8 id; @@ -59,17 +63,17 @@ 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; @@ -96,9 +100,9 @@ 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; -- 1.7.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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