[PATCH RFC 4/7] [GPIO] Let drivers link if they support GPIO API as an addition
From: Anton Vorontsov <hidden>
Date: 2007-12-10 20:45:49
Subsystem:
generic include/asm header files, the rest · Maintainers:
Arnd Bergmann, Linus Torvalds
Signed-off-by: Anton Vorontsov <redacted> --- Hello David, I'm interested in your opinion about that patch. You're also Cc'ed to patch that using that feature. I know, currently that patch will conflict with GPIOLIB patches in -mm, so this is only RFC. include/asm-generic/gpio.h | 47 ++++++++++++++++++++++++++++++++++++++++++++ 1 files changed, 47 insertions(+), 0 deletions(-)
diff --git a/include/asm-generic/gpio.h b/include/asm-generic/gpio.h
index 2d0aab1..cf76a69 100644
--- a/include/asm-generic/gpio.h
+++ b/include/asm-generic/gpio.h@@ -1,6 +1,53 @@ #ifndef _ASM_GENERIC_GPIO_H #define _ASM_GENERIC_GPIO_H +#ifndef CONFIG_GENERIC_GPIO + +/* + * Drivers could be gpio api aware, and at the same time, some + * of them can live without it, or support call-backs approach + * in addition. Let them link. + */ +static inline int gpio_request(unsigned int gpio, const char *label) +{ + return -ENOSYS; +} + +static inline void gpio_free(unsigned int gpio) +{ +} + +static inline int gpio_direction_input(unsigned int gpio) +{ + return -ENOSYS; +} + +static inline int gpio_direction_output(unsigned int gpio, int value) +{ + return -ENOSYS; +} + +static inline int gpio_get_value(unsigned int gpio) +{ + return -ENOSYS; +} + +static inline void gpio_set_value(unsigned int gpio, int value) +{ +} + +static inline int gpio_to_irq(unsigned int gpio) +{ + return -ENOSYS; +} + +static inline int irq_to_gpio(unsigned int irq) +{ + return -ENOSYS; +} + +#endif /* CONFIG_GENERIC_GPIO */ + /* platforms that don't directly support access to GPIOs through I2C, SPI, * or other blocking infrastructure can use these wrappers. */
--
1.5.2.2