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gpiolib: Use GPIO name from names array for gpio descriptor

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This patch adds GPIO names to the GPIO descriptors when initializing the
gpiochip. It also introduces a check whether any of the new names will
conflict with an existing GPIO name.

Signed-off-by: Markus Pargmann <mpa@pengutronix.de>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Markus Pargmann 2015-08-14 16:11:00 +02:00 committed by Linus Walleij
parent c0017ed719
commit 5f3ca7329b
1 changed files with 37 additions and 0 deletions
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37
drivers/gpio/gpiolib.c
View file

@ -250,6 +250,38 @@ static int gpiochip_add_to_list(struct gpio_chip *chip)
return err;
}
/*
* Takes the names from gc->names and checks if they are all unique. If they
* are, they are assigned to their gpio descriptors.
*
* Returns -EEXIST if one of the names is already used for a different GPIO.
*/
static int gpiochip_set_desc_names(struct gpio_chip *gc)
{
int i;
if (!gc->names)
return 0;
/* First check all names if they are unique */
for (i = 0; i != gc->ngpio; ++i) {
struct gpio_desc *gpio;
gpio = gpio_name_to_desc(gc->names[i]);
if (gpio) {
dev_err(gc->dev, "Detected name collision for GPIO name '%s'\n",
gc->names[i]);
return -EEXIST;
}
}
/* Then add all names to the GPIO descriptors */
for (i = 0; i != gc->ngpio; ++i)
gc->desc[i].name = gc->names[i];
return 0;
}
/**
* gpiochip_add() - register a gpio_chip
* @chip: the chip to register, with chip->base initialized
@ -322,6 +354,10 @@ int gpiochip_add(struct gpio_chip *chip)
if (!chip->owner && chip->dev && chip->dev->driver)
chip->owner = chip->dev->driver->owner;
status = gpiochip_set_desc_names(chip);
if (status)
goto err_remove_from_list;
status = of_gpiochip_add(chip);
if (status)
goto err_remove_chip;
@ -342,6 +378,7 @@ int gpiochip_add(struct gpio_chip *chip)
acpi_gpiochip_remove(chip);
gpiochip_free_hogs(chip);
of_gpiochip_remove(chip);
err_remove_from_list:
spin_lock_irqsave(&gpio_lock, flags);
list_del(&chip->list);
spin_unlock_irqrestore(&gpio_lock, flags);