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gpio: define gpio_is_valid() 

Introduce a gpio_is_valid() predicate; use it in gpiolib.

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@pengutronix.de>
    [ use inline function; follow the gpio_* naming convention;
      work without gpiolib; all programming interfaces need docs ]
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Guennadi Liakhovetski 2008-04-28 02:14:46 -07:00 committed by Linus Torvalds
parent d72cbed0c4
commit e6de1808f8
3 changed files with 29 additions and 7 deletions
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10
Documentation/gpio.txt
View File

@ -107,6 +107,16 @@ type of GPIO controller, and on one particular board 80-95 with an FPGA.
The numbers need not be contiguous; either of those platforms could also
use numbers 2000-2063 to identify GPIOs in a bank of I2C GPIO expanders.
If you want to initialize a structure with an invalid GPIO number, use
some negative number (perhaps "-EINVAL"); that will never be valid. To
test if a number could reference a GPIO, you may use this predicate:
int gpio_is_valid(int number);
A number that's not valid will be rejected by calls which may request
or free GPIOs (see below). Other numbers may also be rejected; for
example, a number might be valid but unused on a given board.
Whether a platform supports multiple GPIO controllers is currently a
platform-specific implementation issue.

14
drivers/gpio/gpiolib.c
View File

@ -99,7 +99,7 @@ int gpiochip_add(struct gpio_chip *chip)
* dynamic allocation. We don't currently support that.
*/
if (chip->base < 0 || (chip->base + chip->ngpio) >= ARCH_NR_GPIOS) {
if (chip->base < 0 || !gpio_is_valid(chip->base + chip->ngpio)) {
status = -EINVAL;
goto fail;
}
@ -174,7 +174,7 @@ int gpio_request(unsigned gpio, const char *label)
spin_lock_irqsave(&gpio_lock, flags);
if (gpio >= ARCH_NR_GPIOS)
if (!gpio_is_valid(gpio))
goto done;
desc = &gpio_desc[gpio];
if (desc->chip == NULL)
@ -209,7 +209,7 @@ void gpio_free(unsigned gpio)
unsigned long flags;
struct gpio_desc *desc;
if (gpio >= ARCH_NR_GPIOS) {
if (!gpio_is_valid(gpio)) {
WARN_ON(extra_checks);
return;
}
@ -245,7 +245,7 @@ const char *gpiochip_is_requested(struct gpio_chip *chip, unsigned offset)
{
unsigned gpio = chip->base + offset;
if (gpio >= ARCH_NR_GPIOS || gpio_desc[gpio].chip != chip)
if (!gpio_is_valid(gpio) || gpio_desc[gpio].chip != chip)
return NULL;
if (test_bit(FLAG_REQUESTED, &gpio_desc[gpio].flags) == 0)
return NULL;
@ -276,7 +276,7 @@ int gpio_direction_input(unsigned gpio)
spin_lock_irqsave(&gpio_lock, flags);
if (gpio >= ARCH_NR_GPIOS)
if (!gpio_is_valid(gpio))
goto fail;
chip = desc->chip;
if (!chip || !chip->get || !chip->direction_input)
@ -314,7 +314,7 @@ int gpio_direction_output(unsigned gpio, int value)
spin_lock_irqsave(&gpio_lock, flags);
if (gpio >= ARCH_NR_GPIOS)
if (!gpio_is_valid(gpio))
goto fail;
chip = desc->chip;
if (!chip || !chip->set || !chip->direction_output)
@ -531,7 +531,7 @@ static int gpiolib_show(struct seq_file *s, void *unused)
/* REVISIT this isn't locked against gpio_chip removal ... */
for (gpio = 0; gpio < ARCH_NR_GPIOS; gpio++) {
for (gpio = 0; gpio_is_valid(gpio); gpio++) {
if (chip == gpio_desc[gpio].chip)
continue;
chip = gpio_desc[gpio].chip;

12
include/asm-generic/gpio.h
View File

@ -16,6 +16,12 @@
#define ARCH_NR_GPIOS 256
#endif
static inline int gpio_is_valid(int number)
{
/* only some non-negative numbers are valid */
return ((unsigned)number) < ARCH_NR_GPIOS;
}
struct seq_file;
struct module;
@ -99,6 +105,12 @@ extern int __gpio_cansleep(unsigned gpio);
#else
static inline int gpio_is_valid(int number)
{
/* only non-negative numbers are valid */
return number >= 0;
}
/* platforms that don't directly support access to GPIOs through I2C, SPI,
* or other blocking infrastructure can use these wrappers.
*/