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 <j.anaszewski@xxxxxxxxxxx> > > >>>>Acked-by: Kyungmin Park <kyungmin.park@xxxxxxxxxxx> > > >>>>Cc: Bryan Wu <cooloney@xxxxxxxxx> > > >>>>Cc: Richard Purdie <rpurdie@xxxxxxxxx> > > >>> > > >>>NAK-ed-by: Pavel Machek > > >>> > > >>>>+What: /sys/class/leds/<led>/available_sync_leds > > >>>>+Date: February 2015 > > >>>>+KernelVersion: 3.20 > > >>>>+Contact: Jacek Anaszewski <j.anaszewski@xxxxxxxxxxx> > > >>>>+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 -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
