From 4c20386c8d0719b42503efe65abe47ad3fb3d711 Mon Sep 17 00:00:00 2001 From: David Brownell Date: Mon, 12 Feb 2007 00:53:11 -0800 Subject: [PATCH] GPIO core This defines a simple and minimalist programming interface for GPIO APIs: - Documentation/gpio.txt ... describes things (read it) - include/asm-arm/gpio.h ... defines the ARM hook, which just punts to for any implementation - include/asm-generic/gpio.h ... implement "can sleep" variants as calling the normal ones, for systems that don't handle i2c expanders. The immediate need for such a cross-architecture API convention is to support drivers that work the same on AT91 ARM and AVR32 AP7000 chips, which embed many of the same controllers but have different CPUs. However, several other users have been reported, including a driver for a hardware watchdog chip and some handhelds.org multi-CPU button drivers. Signed-off-by: David Brownell Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- include/asm-arm/gpio.h | 7 +++++++ include/asm-generic/gpio.h | 25 +++++++++++++++++++++++++ 2 files changed, 32 insertions(+) create mode 100644 include/asm-arm/gpio.h create mode 100644 include/asm-generic/gpio.h (limited to 'include') diff --git a/include/asm-arm/gpio.h b/include/asm-arm/gpio.h new file mode 100644 index 000000000000..fff4f800ee42 --- /dev/null +++ b/include/asm-arm/gpio.h @@ -0,0 +1,7 @@ +#ifndef _ARCH_ARM_GPIO_H +#define _ARCH_ARM_GPIO_H + +/* not all ARM platforms necessarily support this API ... */ +#include + +#endif /* _ARCH_ARM_GPIO_H */ diff --git a/include/asm-generic/gpio.h b/include/asm-generic/gpio.h new file mode 100644 index 000000000000..2d0aab1d8611 --- /dev/null +++ b/include/asm-generic/gpio.h @@ -0,0 +1,25 @@ +#ifndef _ASM_GENERIC_GPIO_H +#define _ASM_GENERIC_GPIO_H + +/* platforms that don't directly support access to GPIOs through I2C, SPI, + * or other blocking infrastructure can use these wrappers. + */ + +static inline int gpio_cansleep(unsigned gpio) +{ + return 0; +} + +static inline int gpio_get_value_cansleep(unsigned gpio) +{ + might_sleep(); + return gpio_get_value(gpio); +} + +static inline void gpio_set_value_cansleep(unsigned gpio, int value) +{ + might_sleep(); + gpio_set_value(gpio, value); +} + +#endif /* _ASM_GENERIC_GPIO_H */ -- cgit v1.2.3-58-ga151