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HID: waltop: comment on tablet modes

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Add a comment on modes supported by Waltop tablets - a knowledge extracted
from the outdated official driver, but not yet used by this driver.

Signed-off-by: Nikolai Kondrashov <spbnick@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
Nikolai Kondrashov 2010-08-30 14:06:38 +04:00 committed by Jiri Kosina
parent 30311549c3
commit cdd49a85e2
1 changed files with 27 additions and 2 deletions
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29
drivers/hid/hid-waltop.c
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@ -17,13 +17,38 @@
#include "hid-ids.h"
/*
* There exists an official driver on the manufacturer's website, which
* wasn't submitted to the kernel, for some reason. The official driver
* doesn't seem to support extra features of some tablets, like wheels.
*
* It shows that the feature report ID 2 could be used to control any waltop
* tablet input mode, switching it between "default", "tablet" and "ink".
*
* This driver only uses "default" mode for all the supported tablets. This
* mode tries to be HID-compatible (not very successfully), but cripples the
* resolution of some tablets.
*
* The "tablet" mode uses some proprietary, yet decipherable protocol, which
* represents the correct resolution, but is possibly HID-incompatible (i.e.
* indescribable by a report descriptor).
*
* The purpose of the "ink" mode is unknown.
*
* The feature reports needed for switching to each mode are these:
*
* 02 16 00 default
* 02 16 01 tablet
* 02 16 02 ink
*/
/*
* Original Slim Tablet 5.8 inch report descriptor.
*
* All the reports except the report with ID 16 (the stylus) are unused,
* possibly because the tablet is not configured to, or because they were
* just copied from a more capable model. The purpose of features described
* for report ID 2 is unknown.
* just copied from a more capable model. The full purpose of features
* described for report ID 2 is unknown.
*
* The stylus buttons are described as three bit fields, whereas actually
* it's an "array", i.e. they're reported as button numbers (1, 2 and 3).