Messages in this thread Patch in this message | | | From | Javier Martinez Canillas <> | Subject | [RESEND PATCH] leds: leds-gpio: set devm_gpio_request_one() flags correctly | Date | Fri, 21 Dec 2012 16:07:44 +0100 |
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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> ---
This makes LEDs to work again on my IGEPv2 board (TI OMAP3 based SoC).
I sent this patch before but then realized that I only cc'ed to linux-leds. So, I'm resending the patch cc'ing linux-omap,linux-arm-kernel and LKML to reach a broader audience and have more people review/test the patch.
Sorry for the noise if someone got it twice.
drivers/leds/leds-gpio.c | 5 +++-- 1 files changed, 3 insertions(+), 2 deletions(-)
diff --git a/drivers/leds/leds-gpio.c b/drivers/leds/leds-gpio.c index 1885a26..a0d931b 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; -- 1.7.7.6
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