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| author | Bruno Prémont <bonbons@linux-vserver.org> | 2010-03-30 22:34:30 +0200 |
|---|---|---|
| committer | Jiri Kosina <jkosina@suse.cz> | 2010-03-31 11:21:29 +0200 |
| commit | b8c21cf697d165999cc21a90e6caa73690ac6190 (patch) | |
| tree | 795001ad27187193af60ca856a19790c9c29e122 /Documentation/ABI/testing/sysfs-driver-hid-picolcd | |
| parent | 236db47c2b3b69464d50c695ab2ddd516cf64520 (diff) | |
| download | lwn-b8c21cf697d165999cc21a90e6caa73690ac6190.tar.gz lwn-b8c21cf697d165999cc21a90e6caa73690ac6190.zip | |
HID: add framebuffer support to PicoLCD device
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 <bonbons@linux-vserver.org>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Diffstat (limited to 'Documentation/ABI/testing/sysfs-driver-hid-picolcd')
| -rw-r--r-- | Documentation/ABI/testing/sysfs-driver-hid-picolcd | 17 |
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 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/<busnum>-<devnum>:<config num>.<interface num>/<hid-bus>:<vendor-id>:<product-id>.<num>/fb_update_rate +Date: March 2010 +Contact: Bruno Prémont <bonbons@linux-vserver.org> +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. + |