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git-svn-id: svn://svn.openwrt.org/openwrt/trunk@13137 3c298f89-4303-0410-b956-a3cf2f4a3e73
135 lines
4.2 KiB
Diff
135 lines
4.2 KiB
Diff
From: Guennadi Liakhovetski <g.liakhovetski@pengutronix.de>
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Date: Mon, 28 Apr 2008 09:14:46 +0000 (-0700)
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Subject: gpio: define gpio_is_valid()
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X-Git-Tag: v2.6.26-rc1~849
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X-Git-Url: http://git.kernel.org/?p=linux%2Fkernel%2Fgit%2Ftorvalds%2Flinux-2.6.git;a=commitdiff_plain;h=e6de1808f8ebfeb7e49f3c5a30cb8f2032beb287
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gpio: define gpio_is_valid()
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Introduce a gpio_is_valid() predicate; use it in gpiolib.
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Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@pengutronix.de>
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[ use inline function; follow the gpio_* naming convention;
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work without gpiolib; all programming interfaces need docs ]
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Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
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Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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---
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--- a/Documentation/gpio.txt
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+++ b/Documentation/gpio.txt
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@@ -107,6 +107,16 @@ type of GPIO controller, and on one part
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The numbers need not be contiguous; either of those platforms could also
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use numbers 2000-2063 to identify GPIOs in a bank of I2C GPIO expanders.
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+If you want to initialize a structure with an invalid GPIO number, use
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+some negative number (perhaps "-EINVAL"); that will never be valid. To
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+test if a number could reference a GPIO, you may use this predicate:
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+
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+ int gpio_is_valid(int number);
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+
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+A number that's not valid will be rejected by calls which may request
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+or free GPIOs (see below). Other numbers may also be rejected; for
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+example, a number might be valid but unused on a given board.
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+
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Whether a platform supports multiple GPIO controllers is currently a
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platform-specific implementation issue.
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--- a/drivers/gpio/gpiolib.c
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+++ b/drivers/gpio/gpiolib.c
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@@ -99,7 +99,7 @@ int gpiochip_add(struct gpio_chip *chip)
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* dynamic allocation. We don't currently support that.
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*/
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- if (chip->base < 0 || (chip->base + chip->ngpio) >= ARCH_NR_GPIOS) {
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+ if (chip->base < 0 || !gpio_is_valid(chip->base + chip->ngpio)) {
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status = -EINVAL;
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goto fail;
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}
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@@ -174,7 +174,7 @@ int gpio_request(unsigned gpio, const ch
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spin_lock_irqsave(&gpio_lock, flags);
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- if (gpio >= ARCH_NR_GPIOS)
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+ if (!gpio_is_valid(gpio))
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goto done;
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desc = &gpio_desc[gpio];
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if (desc->chip == NULL)
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@@ -209,7 +209,7 @@ void gpio_free(unsigned gpio)
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unsigned long flags;
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struct gpio_desc *desc;
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- if (gpio >= ARCH_NR_GPIOS) {
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+ if (!gpio_is_valid(gpio)) {
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WARN_ON(extra_checks);
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return;
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}
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@@ -245,7 +245,7 @@ const char *gpiochip_is_requested(struct
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{
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unsigned gpio = chip->base + offset;
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- if (gpio >= ARCH_NR_GPIOS || gpio_desc[gpio].chip != chip)
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+ if (!gpio_is_valid(gpio) || gpio_desc[gpio].chip != chip)
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return NULL;
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if (test_bit(FLAG_REQUESTED, &gpio_desc[gpio].flags) == 0)
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return NULL;
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@@ -276,7 +276,7 @@ int gpio_direction_input(unsigned gpio)
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spin_lock_irqsave(&gpio_lock, flags);
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- if (gpio >= ARCH_NR_GPIOS)
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+ if (!gpio_is_valid(gpio))
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goto fail;
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chip = desc->chip;
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if (!chip || !chip->get || !chip->direction_input)
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@@ -314,7 +314,7 @@ int gpio_direction_output(unsigned gpio,
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spin_lock_irqsave(&gpio_lock, flags);
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- if (gpio >= ARCH_NR_GPIOS)
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+ if (!gpio_is_valid(gpio))
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goto fail;
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chip = desc->chip;
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if (!chip || !chip->set || !chip->direction_output)
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@@ -531,7 +531,7 @@ static int gpiolib_show(struct seq_file
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/* REVISIT this isn't locked against gpio_chip removal ... */
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- for (gpio = 0; gpio < ARCH_NR_GPIOS; gpio++) {
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+ for (gpio = 0; gpio_is_valid(gpio); gpio++) {
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if (chip == gpio_desc[gpio].chip)
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continue;
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chip = gpio_desc[gpio].chip;
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--- a/include/asm-generic/gpio.h
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+++ b/include/asm-generic/gpio.h
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@@ -16,6 +16,12 @@
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#define ARCH_NR_GPIOS 256
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#endif
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+static inline int gpio_is_valid(int number)
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+{
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+ /* only some non-negative numbers are valid */
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+ return ((unsigned)number) < ARCH_NR_GPIOS;
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+}
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+
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struct seq_file;
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struct module;
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@@ -99,6 +105,16 @@ extern int __gpio_cansleep(unsigned gpio
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#else
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+static inline int __gpio_is_valid(int number)
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+{
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+ /* only non-negative numbers are valid */
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+ return number >= 0;
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+}
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+
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+#ifndef gpio_is_valid
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+#define gpio_is_valid __gpio_is_valid
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+#endif
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+
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/* platforms that don't directly support access to GPIOs through I2C, SPI,
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* or other blocking infrastructure can use these wrappers.
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*/
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