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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 <[email protected]>
Tested-by: Mika Westerberg <[email protected]>
Signed-off-by: Linus Walleij <[email protected]>
This commit is contained in:
Alexandre Courbot 2014-08-19 10:06:09 -07:00 • committed by Linus Walleij
commit abdc08a3a2
4 changed files with 21 additions and 23 deletions
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3
Documentation/gpio/driver.txt
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@ -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)