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gpio: change gpiochip_request_own_desc() prototype

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The current prototype of gpiochip_request_own_desc() requires to obtain
a pointer to a descriptor. This is in contradiction to all other GPIO
request schemes, and imposes an extra step of obtaining a descriptor to
drivers. Most drivers actually cannot even perform that step since the
function that does it (gpichip_get_desc()) is gpiolib-private.

Change gpiochip_request_own_desc() to return a descriptor from a
(chip, hwnum) tuple and update users of this function (currently
gpiolib-acpi only).

Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>
Tested-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Alexandre Courbot 2014-08-19 10:06:09 -07:00 committed by Linus Walleij
parent e46cf32ced
commit abdc08a3a2
4 changed files with 21 additions and 23 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
Documentation/gpio/driver.txt
View File

@ -178,7 +178,8 @@ does not help since it pins the module to the kernel forever (it calls
try_module_get()). A GPIO driver can use the following functions instead
to request and free descriptors without being pinned to the kernel forever.
int gpiochip_request_own_desc(struct gpio_desc *desc, const char *label)
struct gpio_desc *gpiochip_request_own_desc(struct gpio_desc *desc,
const char *label)
void gpiochip_free_own_desc(struct gpio_desc *desc)

20
drivers/gpio/gpiolib-acpi.c
View File

@ -145,14 +145,8 @@ static acpi_status acpi_gpiochip_request_interrupt(struct acpi_resource *ares,
if (!handler)
return AE_BAD_PARAMETER;
desc = gpiochip_get_desc(chip, pin);
desc = gpiochip_request_own_desc(chip, pin, "ACPI:Event");
if (IS_ERR(desc)) {
dev_err(chip->dev, "Failed to get GPIO descriptor\n");
return AE_ERROR;
}
ret = gpiochip_request_own_desc(desc, "ACPI:Event");
if (ret) {
dev_err(chip->dev, "Failed to request GPIO\n");
return AE_ERROR;
}
@ -420,22 +414,14 @@ acpi_gpio_adr_space_handler(u32 function, acpi_physical_address address,
}
}
if (!found) {
int ret;
desc = gpiochip_get_desc(chip, pin);
desc = gpiochip_request_own_desc(chip, pin,
"ACPI:OpRegion");
if (IS_ERR(desc)) {
status = AE_ERROR;
mutex_unlock(&achip->conn_lock);
goto out;
}
ret = gpiochip_request_own_desc(desc, "ACPI:OpRegion");
if (ret) {
status = AE_ERROR;
mutex_unlock(&achip->conn_lock);
goto out;
}
switch (agpio->io_restriction) {
case ACPI_IO_RESTRICT_INPUT:
gpiod_direction_input(desc);

18
drivers/gpio/gpiolib.c
View File

@ -895,12 +895,22 @@ EXPORT_SYMBOL_GPL(gpiochip_is_requested);
* allows the GPIO chip module to be unloaded as needed (we assume that the
* GPIO chip driver handles freeing the GPIOs it has requested).
*/
int gpiochip_request_own_desc(struct gpio_desc *desc, const char *label)
struct gpio_desc *gpiochip_request_own_desc(struct gpio_chip *chip, u16 hwnum,
const char *label)
{
if (!desc || !desc->chip)
return -EINVAL;
struct gpio_desc *desc = gpiochip_get_desc(chip, hwnum);
int err;
return __gpiod_request(desc, label);
if (IS_ERR(desc)) {
chip_err(chip, "failed to get GPIO descriptor\n");
return desc;
}
err = __gpiod_request(desc, label);
if (err < 0)
return ERR_PTR(err);
return desc;
}
EXPORT_SYMBOL_GPL(gpiochip_request_own_desc);

3
include/linux/gpio/driver.h
View File

@ -166,7 +166,8 @@ int gpiochip_irqchip_add(struct gpio_chip *gpiochip,
#endif /* CONFIG_GPIO_IRQCHIP */
int gpiochip_request_own_desc(struct gpio_desc *desc, const char *label);
struct gpio_desc *gpiochip_request_own_desc(struct gpio_chip *chip, u16 hwnum,
const char *label);
void gpiochip_free_own_desc(struct gpio_desc *desc);
#else /* CONFIG_GPIOLIB */