path: root/Documentation/ABI/testing/sysfs-driver-hid-picolcd
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-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 <>
-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.
- Note: when switching mode the current PicoLCD HID device gets
- disconnected and reconnects after above delay (see attribute
- operation_mode_delay for its value).
-What: /sys/bus/usb/devices/<busnum>-<devnum>:<config num>.<interface num>/<hid-bus>:<vendor-id>:<product-id>.<num>/operation_mode_delay
-Date: April 2010
-Contact: Bruno Prémont <>
-Description: Delay PicoLCD waits before restarting in new mode when
- operation_mode has changed.
- Reading/Writing: It is expressed in ms and permitted range is
- 0..30000ms.
-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 <>
-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.