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authorNikolai Kondrashov <spbnick@gmail.com>2010-08-30 14:06:38 +0400
committerJiri Kosina <jkosina@suse.cz>2010-09-01 12:36:36 +0200
commitcdd49a85e237929a4c00965f1a88bdd9195898d8 (patch)
tree5d6bb849f4d40f5f7cdf49538dcd427426d0783d /drivers/hid/hid-waltop.c
parent30311549c3e2a0d9d839ed6e40398a2c354ce5e2 (diff)
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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Add a comment on modes supported by Waltop tablets - a knowledge extracted from the outdated official driver, but not yet used by this driver.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.c29
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).