From: Simon Guinot Date: Thu, 2 Jul 2015 17:56:42 +0000 (+0200) Subject: leds: leds-ns2: handle can_sleep GPIOs X-Git-Tag: omap-for-v4.3/fixes-merge-window~32^2~9 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=4b90432dc1edca6cfc0bb338794beed46af3a472;p=pandora-kernel.git leds: leds-ns2: handle can_sleep GPIOs On the board n090401 (Seagate NAS 4-Bay), some of the LEDs are handled by the leds-ns2 driver. This LEDs are connected to an I2C GPIO expander (PCA95554PW) which means that GPIO access may sleep. This patch makes leds-ns2 compatible with such GPIOs by using the *_cansleep() variant of the GPIO functions. As a drawback this functions can't be used safely in a timer context (with the timer LED trigger for example). To fix this issue, a workqueue mechanism (copied from the leds-gpio driver) is used. Note that this patch also updates slightly the ns2_led_sata_store function. The LED state is now retrieved from cached values instead of reading the GPIOs previously. This prevents ns2_led_sata_store from working with a stale LED state (which may happen when a delayed work is pending). Signed-off-by: Simon Guinot Signed-off-by: Vincent Donnefort Signed-off-by: Jacek Anaszewski --- Reading git-diff-tree failed