Hi Simon,
On 06/18/2015 05:17 PM, Simon Guinot wrote:
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 <[email protected]>
Signed-off-by: Vincent Donnefort <[email protected]>
---
drivers/leds/leds-ns2.c | 56 ++++++++++++++++++++++++++++++++++++-------------
1 file changed, 42 insertions(+), 14 deletions(-)
Acked-by: Jacek Anaszewski <[email protected]>
--
Best Regards,
Jacek Anaszewski
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