HID: new driver for PicoLCD device

Add basic driver for PicoLCD graphics device.
Initially support keypad with input device and provide support
for debugging communication via events file from debugfs.

Signed-off-by: Bruno Prémont <bonbons@linux-vserver.org>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

1 files changed, 17 insertions, 0 deletions

diff --git a/Documentation/ABI/testing/sysfs-driver-hid-picolcd b/Documentation/ABI/testing/sysfs-driver-hid-picolcd
new file mode 100644
index 000000000000..6fb4f21469f7
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-driver-hid-picolcd
@@ -0,0 +1,17 @@
+What:           /sys/bus/usb/devices/<busnum>-<devnum>:<config num>.<interface num>/<hid-bus>:<vendor-id>:<product-id>.<num>/operation_mode
+Date:           March 2010
+Contact:        Bruno Prémont <bonbons@linux-vserver.org>
+Description:    Make it possible to switch the PicoLCD device between LCD
+                (firmware) and bootloader (flasher) operation modes.
+
+                Reading: returns list of available modes, the active mode being
+                enclosed in brackets ('[' and ']')
+
+                Writing: causes operation mode switch. Permitted values are
+                the non-active mode names listed when read, optionally followed
+                by a delay value expressed in ms.
+
+                Note: when switching mode the current PicoLCD HID device gets
+                disconnected and reconnects after above delay (default value
+                is 5 seconds though this default should not be relied on).
+