diff options
| author | Guenter Roeck <linux@roeck-us.net> | 2013-11-22 09:26:01 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-01-29 05:06:18 -0800 |
| commit | f4d566d8de432c1bf94f8f26dd99871601775203 (patch) | |
| tree | 3514168e8508f446daceb2141b21c195598188f1 | |
| parent | bfb158e133d338823eec0c55dbe2be9f685f9739 (diff) | |
| download | lwn-f4d566d8de432c1bf94f8f26dd99871601775203.tar.gz lwn-f4d566d8de432c1bf94f8f26dd99871601775203.zip | |
extcon: gpio: Request gpio pin before modifying its state
commit 4288d9b8edcec7289e00eecdad44f14c9ea1ba0e upstream.
Commit 338de0ca (extcon: gpio: Use gpio driver/chip debounce if supported)
introduced a call to gpio_set_debounce() before actually requesting the
respective gpio pin from the gpio subsystem.
The gpio subsystem expects that a gpio pin was requested before modifying its
state. Not doing so results in a warning from gpiolib, and the gpio pin is
auto-requested. This in turn causes the subsequent devm_gpio_request_one()
to fail. So devm_gpio_request_one() must be called prior to calling
gpio_set_debounce().
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Acked-by: MyungJoo Ham <myungjoo.ham@samsung.com>
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/extcon/extcon-gpio.c | 11 |
1 files changed, 6 insertions, 5 deletions
diff --git a/drivers/extcon/extcon-gpio.c b/drivers/extcon/extcon-gpio.c index 7e0dff58e494..4736a9c57efa 100644 --- a/drivers/extcon/extcon-gpio.c +++ b/drivers/extcon/extcon-gpio.c @@ -105,6 +105,12 @@ static int gpio_extcon_probe(struct platform_device *pdev) extcon_data->state_off = pdata->state_off; if (pdata->state_on && pdata->state_off) extcon_data->edev.print_state = extcon_gpio_print_state; + + ret = devm_gpio_request_one(&pdev->dev, extcon_data->gpio, GPIOF_DIR_IN, + pdev->name); + if (ret < 0) + return ret; + if (pdata->debounce) { ret = gpio_set_debounce(extcon_data->gpio, pdata->debounce * 1000); @@ -117,11 +123,6 @@ static int gpio_extcon_probe(struct platform_device *pdev) if (ret < 0) return ret; - ret = devm_gpio_request_one(&pdev->dev, extcon_data->gpio, GPIOF_DIR_IN, - pdev->name); - if (ret < 0) - goto err; - INIT_DELAYED_WORK(&extcon_data->work, gpio_extcon_work); extcon_data->irq = gpio_to_irq(extcon_data->gpio); |