#ifndef _GPIO_DEV_H__ #define _GPIO_DEV_H__ /********************************************************************* * * This Linux kernel header is expanded from the original driver * (gpio_dev) by John Crispin. It provides an ioctl based interface to * GPIO pins via the /dev/gpio char device and gpiolib within the kernel. * The third argument to each ioctl is the GPIO pin number. * * This driver has been tested with lk 2.6.31 and works. The original * driver fails quietly with this version. The protocol is now a bit * different: the ioctl(fd, GPIO_REQUEST, ) should be called * after the open("/dev/gpio", O_RDWR) to determine if the is * already in use. If the ioctl is successful (i.e. returns 0 for not * in use) then the is claimed by this driver and * ioctl(fd, GPIO_FREE, ) should be called prior to close(fd) . * * See /Documentation/gpio.txt * Note that kernel designers prefer the use of the sysfs gpio interface. * This char driver is easier to use from code and faster. ********************************************************************/ /* This header can be included in both the user and kernel spaces */ /* The _IO macro is defined in sys/ioctl.h */ #define IOC_GPIODEV_MAGIC 'B' #define GPIO_GET _IO(IOC_GPIODEV_MAGIC, 10) #define GPIO_SET _IO(IOC_GPIODEV_MAGIC, 11) #define GPIO_CLEAR _IO(IOC_GPIODEV_MAGIC, 12) #define GPIO_DIR_IN _IO(IOC_GPIODEV_MAGIC, 13) #define GPIO_DIR_OUT _IO(IOC_GPIODEV_MAGIC, 14) /* Sets the direction out and clears the (low) */ #define GPIO_DIR_HIGH _IO(IOC_GPIODEV_MAGIC, 15) /* Sets the direction out and sets the (high) */ #define GPIO_REQUEST _IO(IOC_GPIODEV_MAGIC, 16) #define GPIO_FREE _IO(IOC_GPIODEV_MAGIC, 17) #define GPIO_CAN_SLEEP _IO(IOC_GPIODEV_MAGIC, 18) // #define GPIO_SPARE1 _IO(IOC_GPIODEV_MAGIC, 19) // #define GPIO_SPARE2 _IO(IOC_GPIODEV_MAGIC, 20) // #define GPIO_SPARE3 _IO(IOC_GPIODEV_MAGIC, 21) // #define GPIO_SPARE4 _IO(IOC_GPIODEV_MAGIC, 22) #endif