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>
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17c760687f
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@ -25,6 +25,10 @@ MODULE_LICENSE("GPL");
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#include "hid-ids.h"
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/* estimated signal-to-noise ratios */
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#define SN_MOVE 4096
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#define SN_PRESSURE 32
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struct egalax_data {
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__u16 x, y, z;
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__u8 id;
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@ -57,17 +61,17 @@ static int egalax_input_mapping(struct hid_device *hdev, struct hid_input *hi,
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field->logical_maximum = 32760;
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hid_map_usage(hi, usage, bit, max,
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EV_ABS, ABS_MT_POSITION_X);
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set_abs(input, ABS_MT_POSITION_X, field, 0);
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set_abs(input, ABS_MT_POSITION_X, field, SN_MOVE);
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/* touchscreen emulation */
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set_abs(input, ABS_X, field, 0);
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set_abs(input, ABS_X, field, SN_MOVE);
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return 1;
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case HID_GD_Y:
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field->logical_maximum = 32760;
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hid_map_usage(hi, usage, bit, max,
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EV_ABS, ABS_MT_POSITION_Y);
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set_abs(input, ABS_MT_POSITION_Y, field, 0);
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set_abs(input, ABS_MT_POSITION_Y, field, SN_MOVE);
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/* touchscreen emulation */
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set_abs(input, ABS_Y, field, 0);
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set_abs(input, ABS_Y, field, SN_MOVE);
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return 1;
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}
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return 0;
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@ -93,9 +97,9 @@ static int egalax_input_mapping(struct hid_device *hdev, struct hid_input *hi,
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field->logical_minimum = 0;
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hid_map_usage(hi, usage, bit, max,
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EV_ABS, ABS_MT_PRESSURE);
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set_abs(input, ABS_MT_PRESSURE, field, 0);
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set_abs(input, ABS_MT_PRESSURE, field, SN_PRESSURE);
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/* touchscreen emulation */
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set_abs(input, ABS_PRESSURE, field, 0);
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set_abs(input, ABS_PRESSURE, field, SN_PRESSURE);
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return 1;
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}
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return 0;
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