Documentation: leds-lp5523: describe master fader attributes

2) Firmware interface - LP55xx common interface

2) Firmware interface - LP55xx common interface

  For the details, please refer to 'firmware' section in leds-lp55xx.txt

  For the details, please refer to 'firmware' section in leds-lp55xx.txt

LP5523 has three master faders. If a channel is mapped to one of

the master faders, its output is dimmed based on the value of the master

fader.

For example,

  echo "123000123" > master_fader_leds

creates the following channel-fader mappings:

  channel 0,6 to master_fader1

  channel 1,7 to master_fader2

  channel 2,8 to master_fader3

Then, to have 25% of the original output on channel 0,6:

  echo 64 > master_fader1

To have 0% of the original output (i.e. no output) channel 1,7:

  echo 0 > master_fader2

To have 100% of the original output (i.e. no dimming) on channel 2,8:

  echo 255 > master_fader3

To clear all master fader controls:

  echo "000000000" > master_fader_leds

Selftest uses always the current from the platform data.

Selftest uses always the current from the platform data.

Each channel contains led current settings.

Each channel contains led current settings.