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| author | Henrik Rydberg <rydberg@euromail.se> | 2010-09-05 12:57:13 -0700 |
|---|---|---|
| committer | Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2010-09-05 12:58:22 -0700 |
| commit | f4ccbef2886968ed409939531f6dd0474d53a12a (patch) | |
| tree | 764b513e40b681bf3bd908e40e8e3a21015d7579 /drivers/input/tablet/wacom_wac.c | |
| parent | cb734c03680eaaad64a20a666300eafd1ac260b2 (diff) | |
| download | blackbird-op-linux-f4ccbef2886968ed409939531f6dd0474d53a12a.tar.gz blackbird-op-linux-f4ccbef2886968ed409939531f6dd0474d53a12a.zip | |
Input: wacom - add a quirk for low resolution Bamboo devices
The Bamboo Touch reports a sub-screen resolution of 480x320. The
signal-to-noise ratio is only about 100, so filtering is needed in
order to reduce the jitter to a usable level. However, the low
resolution leads to round-off errors in the EWMA filter, resulting in
extremely jerky pointer motion. This patch explicitly sets a higher
resolution for those devices, and tells this to the completion handler
via a low-resolution quirk.
Signed-off-by: Henrik Rydberg <rydberg@euromail.se>
Acked-by: Ping Cheng <pingc@wacom.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
Diffstat (limited to 'drivers/input/tablet/wacom_wac.c')
| -rw-r--r-- | drivers/input/tablet/wacom_wac.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/input/tablet/wacom_wac.c b/drivers/input/tablet/wacom_wac.c index 4e9b1ddf54e9..2f4411aee305 100644 --- a/drivers/input/tablet/wacom_wac.c +++ b/drivers/input/tablet/wacom_wac.c @@ -857,6 +857,7 @@ static int wacom_tpc_irq(struct wacom_wac *wacom, size_t len) static int wacom_bpt_irq(struct wacom_wac *wacom, size_t len) { + struct wacom_features *features = &wacom->features; struct input_dev *input = wacom->input; unsigned char *data = wacom->data; int sp = 0, sx = 0, sy = 0, count = 0; @@ -871,6 +872,10 @@ static int wacom_bpt_irq(struct wacom_wac *wacom, size_t len) if (p) { int x = get_unaligned_be16(&data[9 * i + 3]) & 0x7ff; int y = get_unaligned_be16(&data[9 * i + 5]) & 0x7ff; + if (features->quirks & WACOM_QUIRK_BBTOUCH_LOWRES) { + x <<= 5; + y <<= 5; + } input_report_abs(input, ABS_MT_PRESSURE, p); input_report_abs(input, ABS_MT_POSITION_X, x); input_report_abs(input, ABS_MT_POSITION_Y, y); @@ -1010,8 +1015,13 @@ void wacom_setup_device_quirks(struct wacom_features *features) /* quirks for bamboo touch */ if (features->type == BAMBOO_PT && features->device_type == BTN_TOOL_TRIPLETAP) { + features->x_max <<= 5; + features->y_max <<= 5; + features->x_fuzz <<= 5; + features->y_fuzz <<= 5; features->pressure_max = 256; features->pressure_fuzz = 16; + features->quirks |= WACOM_QUIRK_BBTOUCH_LOWRES; } } |
