Messages in this thread Patch in this message | | | From | Nicolas Ferre <> | Subject | [PATCH v2] AT91: pio: add gpio_is_valid() function | Date | Mon, 6 Sep 2010 16:21:04 +0200 |
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Add a simple gpio_is_valid() function to overload the standard one. It takes into account the AT91 pio numbering to check if a proper value is used. The upper limit keeps room for IO expanders above regular on-chip GPIO numbers.
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com> Acked-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com> --- Changes since v1: define ARCH_NR_GPIOS for AT91 keeping room for IO expanders now use an upper limit to conform with gpiolib
arch/arm/mach-at91/include/mach/gpio.h | 14 ++++++++++++++ include/asm-generic/gpio.h | 4 ++++ 2 files changed, 18 insertions(+), 0 deletions(-)
diff --git a/arch/arm/mach-at91/include/mach/gpio.h b/arch/arm/mach-at91/include/mach/gpio.h index bfdd8ab..55828ad 100644 --- a/arch/arm/mach-at91/include/mach/gpio.h +++ b/arch/arm/mach-at91/include/mach/gpio.h @@ -21,6 +21,10 @@ #define MAX_GPIO_BANKS 5 #define NR_BUILTIN_GPIO (PIN_BASE + (MAX_GPIO_BANKS * 32)) +/* keep room for a couple of GPIO expanders */ +#define NR_EXTRA_GPIO 64 +#define ARCH_NR_GPIOS (NR_BUILTIN_GPIO + NR_EXTRA_GPIO) + /* these pin numbers double as IRQ numbers, like AT91xxx_ID_* values */ #define AT91_PIN_PA0 (PIN_BASE + 0x00 + 0) @@ -189,6 +193,16 @@ #define AT91_PIN_PE31 (PIN_BASE + 0x80 + 31) #ifndef __ASSEMBLY__ +static inline int gpio_is_valid(int number) +{ + if (number >= PIN_BASE && + number <= ARCH_NR_GPIOS) + return 1; + return 0; +} +#define __HAVE_ARCH_GPIO_IS_VALID 1 + + /* setup setup routines, called from board init or driver probe() */ extern int __init_or_module at91_set_GPIO_periph(unsigned pin, int use_pullup); extern int __init_or_module at91_set_A_periph(unsigned pin, int use_pullup); diff --git a/include/asm-generic/gpio.h b/include/asm-generic/gpio.h index c7376bf..264e701 100644 --- a/include/asm-generic/gpio.h +++ b/include/asm-generic/gpio.h @@ -22,11 +22,13 @@ #define ARCH_NR_GPIOS 256 #endif +#ifndef __HAVE_ARCH_GPIO_IS_VALID static inline int gpio_is_valid(int number) { /* only some non-negative numbers are valid */ return ((unsigned)number) < ARCH_NR_GPIOS; } +#endif struct device; struct seq_file; @@ -200,11 +202,13 @@ extern void gpio_unexport(unsigned gpio); #else /* !CONFIG_HAVE_GPIO_LIB */ +#ifndef __HAVE_ARCH_GPIO_IS_VALID static inline int gpio_is_valid(int number) { /* only non-negative numbers are valid */ return number >= 0; } +#endif /* platforms that don't directly support access to GPIOs through I2C, SPI, * or other blocking infrastructure can use these wrappers. -- 1.5.6.5
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