From b8c21cf697d165999cc21a90e6caa73690ac6190 Mon Sep 17 00:00:00 2001 From: Bruno Prémont Date: Tue, 30 Mar 2010 22:34:30 +0200 Subject: HID: add framebuffer support to PicoLCD device MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Add framebuffer support to PicoLCD device with use of deferred-io. Only changed areas of framebuffer get sent to device in order to save USB bandwidth and especially resources on PicoLCD device or allow higher refresh rate for a small area. Changed tiles are determined while updating shadow framebuffer. Signed-off-by: Bruno Prémont Signed-off-by: Jiri Kosina --- Documentation/ABI/testing/sysfs-driver-hid-picolcd | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) (limited to 'Documentation/ABI/testing/sysfs-driver-hid-picolcd') diff --git a/Documentation/ABI/testing/sysfs-driver-hid-picolcd b/Documentation/ABI/testing/sysfs-driver-hid-picolcd index 6fb4f21469f7..14f52d70621b 100644 --- a/Documentation/ABI/testing/sysfs-driver-hid-picolcd +++ b/Documentation/ABI/testing/sysfs-driver-hid-picolcd @@ -15,3 +15,20 @@ Description: Make it possible to switch the PicoLCD device between LCD disconnected and reconnects after above delay (default value is 5 seconds though this default should not be relied on). + +What: /sys/bus/usb/devices/-:./::./fb_update_rate +Date: March 2010 +Contact: Bruno Prémont +Description: Make it possible to adjust defio refresh rate. + + Reading: returns list of available refresh rates (expressed in Hz), + the active refresh rate being enclosed in brackets ('[' and ']') + + Writing: accepts new refresh rate expressed in integer Hz + within permitted rates. + + Note: As device can barely do 2 complete refreshes a second + it only makes sense to adjust this value if only one or two + tiles get changed and it's not appropriate to expect the application + to flush it's tiny changes explicitely at higher than default rate. + -- cgit v1.2.3