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gpiolib: gpio_request(): print message on error 

Just copy gpiod_request() function logic from linux-v3.13-rc7.

Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
This commit is contained in:
Antony Pavlov 2014-01-09 21:58:37 +04:00 committed by Sascha Hauer
parent d95f27aaa8
commit f8cdb92751
1 changed files with 17 additions and 6 deletions
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23
drivers/gpio/gpiolib.c
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@ -50,22 +50,33 @@ int gpio_request(unsigned gpio, const char *label)
struct gpio_info *gi = gpio_to_desc(gpio);
int ret;
if (!gi)
return -ENODEV;
if (!gi) {
ret = -ENODEV;
goto done;
}
if (gi->requested)
return -EBUSY;
if (gi->requested) {
ret = -EBUSY;
goto done;
}
ret = 0;
if (gi->chip->ops->request) {
ret = gi->chip->ops->request(gi->chip, gpio - gi->chip->base);
if (ret)
return ret;
goto done;
}
gi->requested = true;
gi->label = xstrdup(label);
return 0;
done:
if (ret)
pr_err("_gpio_request: gpio-%d (%s) status %d\n",
gpio, label ? : "?", ret);
return ret;
}
void gpio_free(unsigned gpio)