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| author | Nikolai Kondrashov <spbnick@gmail.com> | 2010-08-30 14:06:38 +0400 |
|---|---|---|
| committer | Jiri Kosina <jkosina@suse.cz> | 2010-09-01 12:36:36 +0200 |
| commit | cdd49a85e237929a4c00965f1a88bdd9195898d8 (patch) | |
| tree | 5d6bb849f4d40f5f7cdf49538dcd427426d0783d /drivers/hid/hid-waltop.c | |
| parent | 30311549c3e2a0d9d839ed6e40398a2c354ce5e2 (diff) | |
| download | linux-cdd49a85e237929a4c00965f1a88bdd9195898d8.tar.gz linux-cdd49a85e237929a4c00965f1a88bdd9195898d8.tar.bz2 linux-cdd49a85e237929a4c00965f1a88bdd9195898d8.zip | |
HID: waltop: comment on tablet modes
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from the outdated official driver, but not yet used by this driver.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>
Diffstat (limited to 'drivers/hid/hid-waltop.c')
| -rw-r--r-- | drivers/hid/hid-waltop.c | 29 |
1 files changed, 27 insertions, 2 deletions
diff --git a/drivers/hid/hid-waltop.c b/drivers/hid/hid-waltop.c index 246160a9fb89..6ef9ed6a57d6 100644 --- a/drivers/hid/hid-waltop.c +++ b/drivers/hid/hid-waltop.c @@ -18,12 +18,37 @@ #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). |