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authorJavier Martinez Canillas <javier.martinez@collabora.co.uk>2012-12-20 04:56:59 -0800
committerBryan Wu <cooloney@gmail.com>2013-01-02 17:58:41 -0800
commit2d7c22f67d5c342a6296127af4f224208449b779 (patch)
treee8ddaa212a4833bbb8c4ccf91a73167192955a5a
parenta49f0d1ea3ec94fc7cf33a7c36a16343b74bd565 (diff)
downloadconfigs-2d7c22f67d5c342a6296127af4f224208449b779.tar.gz
leds: leds-gpio: set devm_gpio_request_one() flags param correctly
commit a99d76f leds: leds-gpio: use gpio_request_one changed the leds-gpio driver to use gpio_request_one() instead of gpio_request() + gpio_direction_output() Unfortunately, it also made a semantic change that breaks the leds-gpio driver. The gpio_request_one() flags parameter was set to: GPIOF_DIR_OUT | (led_dat->active_low ^ state) Since GPIOF_DIR_OUT is 0, the final flags value will just be the XOR'ed value of led_dat->active_low and state. This value were used to distinguish between HIGH/LOW output initial level and call gpio_direction_output() accordingly. With this new semantic gpio_request_one() will take the flags value of 1 as a configuration of input direction (GPIOF_DIR_IN) and will call gpio_direction_input() instead of gpio_direction_output(). int gpio_request_one(unsigned gpio, unsigned long flags, const char *label) { .. if (flags & GPIOF_DIR_IN) err = gpio_direction_input(gpio); else err = gpio_direction_output(gpio, (flags & GPIOF_INIT_HIGH) ? 1 : 0); .. } The right semantic is to evaluate led_dat->active_low ^ state and set the output initial level explicitly. Signed-off-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk> Reported-by: Arnaud Patard <arnaud.patard@rtp-net.org> Tested-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com> Signed-off-by: Bryan Wu <cooloney@gmail.com>
-rw-r--r--drivers/leds/leds-gpio.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/leds/leds-gpio.c b/drivers/leds/leds-gpio.c
index 1885a26776b..a0d931bcb37 100644
--- a/drivers/leds/leds-gpio.c
+++ b/drivers/leds/leds-gpio.c
@@ -127,8 +127,9 @@ static int create_gpio_led(const struct gpio_led *template,
led_dat->cdev.flags |= LED_CORE_SUSPENDRESUME;
ret = devm_gpio_request_one(parent, template->gpio,
- GPIOF_DIR_OUT | (led_dat->active_low ^ state),
- template->name);
+ (led_dat->active_low ^ state) ?
+ GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW,
+ template->name);
if (ret < 0)
return ret;