On Fri 2015-02-20 07:36:16, Greg KH wrote:
> On Fri, Feb 20, 2015 at 08:56:11AM +0100, Jacek Anaszewski wrote:
> > On 02/19/2015 10:40 PM, Greg KH wrote:
> > >On Thu, Feb 19, 2015 at 11:02:04AM +0200, Sakari Ailus wrote:
> > >>On Wed, Feb 18, 2015 at 11:47:47PM +0100, Pavel Machek wrote:
> > >>>
> > >>>On Wed 2015-02-18 17:20:22, Jacek Anaszewski wrote:
> > >>>>Add a documentation of LED Flash class specific sysfs attributes.
> > >>>>
> > >>>>Signed-off-by: Jacek Anaszewski <[email protected]>
> > >>>>Acked-by: Kyungmin Park <[email protected]>
> > >>>>Cc: Bryan Wu <[email protected]>
> > >>>>Cc: Richard Purdie <[email protected]>
> > >>>
> > >>>NAK-ed-by: Pavel Machek
> > >>>
> > >>>>+What: /sys/class/leds/<led>/available_sync_leds
> > >>>>+Date: February 2015
> > >>>>+KernelVersion: 3.20
> > >>>>+Contact: Jacek Anaszewski <[email protected]>
> > >>>>+Description: read/write
> > >>>>+ Space separated list of LEDs available for flash strobe
> > >>>>+ synchronization, displayed in the format:
> > >>>>+
> > >>>>+ led1_id.led1_name led2_id.led2_name led3_id.led3_name
> > >>>>etc.
> > >>>
> > >>>Multiple values per file, with all the problems we had in /proc. I
> > >>>assume led_id is an integer? What prevents space or dot in led name?
> > >>
> > >>Very good point. How about using a newline instead? That'd be a little bit
> > >>easier to parse, too.
> > >
> > >No, please make it one value per-file, which is what sysfs requires.
> >
> > The purpose of this attribute is only to provide an information about
> > the range of valid identifiers that can be written to the
> > flash_sync_strobe attribute. Wouldn't splitting this to many attributes
> > be an unnecessary inflation of sysfs files?
>
> Ok a list of allowed values to write is acceptable, as long as it is not
> hard to parse and always is space separated.
Well, this one is list of LED numbers and LED names.
> > Apart from it, we have also flash_faults attribute, that currently
> > provides a space separated list of flash faults that have occurred.
>
> That's crazy, what's to keep it from growing and growing to be larger
> than is allowed to be read?
Umm. Actually, this one is less crazy, I'd say. List of faults is
fixed, and you can have them all-at-once, at most, which is way below
4K limit.
Pavel
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