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HID: wacom: Limit touchstrip data to 13 bits 

Commit c7f0522 uses sixteen bits of data in the construction of 'strip1'
and 'strip2'. This can cause problems in some cases, however, since some
tablets store flags in the MSB of data[2] and data[4] that should not be
included in these values. This restores the 0x1f mask that used prior
to c7f0522.

Signed-off-by: Jason Gerecke <jason.gerecke@wacom.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
Jason Gerecke 2015-12-16 13:37:33 -08:00 committed by Jiri Kosina
parent 8f9cfdd359
commit f73d08d073
1 changed files with 2 additions and 2 deletions
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4
drivers/hid/wacom_wac.c
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@ -545,8 +545,8 @@ static int wacom_intuos_pad(struct wacom_wac *wacom)
((data[6] & 0x0F) << 4) |
(data[5] & 0x0F);
}
strip1 = (data[1] << 8) | data[2];
strip2 = (data[3] << 8) | data[4];
strip1 = ((data[1] & 0x1f) << 8) | data[2];
strip2 = ((data[3] & 0x1f) << 8) | data[4];
}
prox = (buttons & ~(~0 << nbuttons)) | (keys & ~(~0 << nkeys)) |