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    SubjectRe: [PATCH/RFC v10 02/19] Documentation: leds: Add description of LED Flash class extension
    Hi!

    > The documentation being added contains overall description of the
    > LED Flash Class and the related sysfs attributes.
    >
    > Signed-off-by: Jacek Anaszewski <j.anaszewski@samsung.com>
    > Acked-by: Kyungmin Park <kyungmin.park@samsung.com>
    > Cc: Bryan Wu <cooloney@gmail.com>
    > Cc: Richard Purdie <rpurdie@rpsys.net>

    > +In order to enable support for flash LEDs CONFIG_LEDS_CLASS_FLASH symbol
    > +must be defined in the kernel config. A flash LED driver must register
    > +in the LED subsystem with led_classdev_flash_register function to gain flash
    > +related capabilities.
    > +
    > +There are flash LED devices which can control more than one LED and allow for
    > +strobing the sub-leds synchronously. A LED will be strobed synchronously with
    > +the one whose identifier is written to the flash_sync_strobe sysfs attribute.
    > +The list of available sub-led identifiers can be read from the

    sub-LED?

    > + - flash_fault - bitmask of flash faults that may have occurred
    > + possible flags are:
    > + * 0x01 - flash controller voltage to the flash LED has exceeded
    > + the limit specific to the flash controller
    > + * 0x02 - the flash strobe was still on when the timeout set by
    > + the user has expired; not all flash controllers may
    > + set this in all such conditions
    > + * 0x04 - the flash controller has overheated
    > + * 0x08 - the short circuit protection of the flash controller
    > + has been triggered
    > + * 0x10 - current in the LED power supply has exceeded the limit
    > + specific to the flash controller
    > + * 0x20 - the flash controller has detected a short or open
    > + circuit condition on the indicator LED
    > + * 0x40 - flash controller voltage to the flash LED has been
    > + below the minimum limit specific to the flash
    > + * 0x80 - the input voltage of the flash controller is below
    > + the limit under which strobing the flash at full
    > + current will not be possible. The condition persists
    > + until this flag is no longer set
    > + * 0x100 - the temperature of the LED has exceeded its allowed
    > + upper limit

    Did not everyone agree that text strings are preferable to bitmasks?

    Pavel

    --
    (english) http://www.livejournal.com/~pavelmachek
    (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html


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