Linux Kernel---56.gpio control __linux

I. The GPIO control of MTK Platform
GPIO configuration in the 1.1 kernel
Set Gpio18 to Gpio mode
Mt_set_gpio_mode (GPIO18, Gpio_mode_gpio);
Set GPIO18 orientation to Out
Mt_set_gpio_dir (GPIO18, gpio_dir_out);
Set Gpio18 height
Mt_set_gpio_out (GPIO18, Gpio_out_one); Low is zero
1.2 Upper level application control Gpio
cong@msi:/work/mtk/temp/gpiotest$ Cat Gpiotest.c
#include <stdio.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <dirent.h>
#include <unistd.h>
#include <string.h>
#include <sys/ioctl.h>
#include <linux/ioctl.h>

#define DBMSG (FMT, args ...) printf ("%s:%s[%d]:" FMT "\ n", __file__,__function__, __line__,# #args)

#define Gpio_ioc_magic 0x90
#define Gpio_iocqmode _ior (gpio_ioc_magic, 0x01, uint32_t)
#define GPIO_IOCTMODE0 _iow (gpio_ioc_magic, 0x02, uint32_t)
#define GPIO_IOCTMODE1 _iow (gpio_ioc_magic, 0x03, uint32_t)
#define GPIO_IOCTMODE2 _iow (gpio_ioc_magic, 0x04, uint32_t)
#define GPIO_IOCTMODE3 _iow (gpio_ioc_magic, 0x05, uint32_t)
#define GPIO_IOCQDIR _ior (gpio_ioc_magic, 0x06, uint32_t)
#define Gpio_iocsdirin _iow (gpio_ioc_magic, 0x07, uint32_t)
#define Gpio_iocsdirout _iow (gpio_ioc_magic, 0x08, uint32_t)
#define Gpio_iocqpullen _ior (gpio_ioc_magic, 0x09, uint32_t)
#define Gpio_iocspullenable _iow (gpio_ioc_magic, 0x0A, uint32_t)
#define Gpio_iocspulldisable _iow (gpio_ioc_magic, 0x0b, uint32_t)
#define Gpio_iocqpull _ior (gpio_ioc_magic, 0x0C, uint32_t)
#define Gpio_iocspulldown _iow (gpio_ioc_magic, 0x0D, uint32_t)
#define Gpio_iocspullup _iow (gpio_ioc_magic, 0x0e, uint32_t)
#define GPIO_IOCQINV _ior (gpio_ioc_magic, 0x0f, uint32_t)
#define Gpio_iocsinvenable _iow (gpio_ioc_magic, 0x10, uint32_t)
#define Gpio_iocsinvdisable _iow (gpio_ioc_magic, 0x11, uint32_t)
#define Gpio_iocqdatain _ior (gpio_ioc_magic, 0x12, uint32_t)
#define Gpio_iocqdataout _ior (gpio_ioc_magic, 0x13, uint32_t)
#define Gpio_iocsdatalow _iow (gpio_ioc_magic, 0x14, uint32_t)
#define Gpio_iocsdatahigh _iow (gpio_ioc_magic, 0x15, uint32_t)

int main (int argc, char *argv[])
{
int Fd_gpio;
int ret;

Fd_gpio = open ("/dev/mtgpio", O_RDWR);
if (Fd_gpio < 0)
{
printf ("Fd_gpio open error\n");
return-1;
}

while (1)
{
RET = IOCTL (Fd_gpio, Gpio_iocsdatahigh, 18);
Sleep (1);
RET = IOCTL (Fd_gpio, Gpio_iocsdatahigh, 18);
Sleep (1);
}

Close (Fd_gpio);
return 0;
} 1.3 Application code
Gpiotest.rar (renamed to gpiotest.tar.gz after downloading)
1.4 View GPIO Status
/sys/class/misc/mtgpio/pin
130|root@78p01:/# Cat/sys/class/misc/mtgpio/pin
PIN: [MODE] [Pull_sel] [DIN] [dout] [PULL EN] [DIR] [IES]
3:3 0 0 0 0 0 1 MI-->mode This is the mode in Code.dws.
4:3 0 0 0 0 1 1 MO
5:3 0 1 0 0 1 1 CS
6:3 0 0 0 0 1 1 CLK two. Using SYS to control the GPIO port
2.1 Code as follows
#include <linux/init.h>
#include <linux/module.h>
#include <linux/device.h>
#include <linux/ioport.h>
#include <linux/errno.h>
#include <linux/workqueue.h>
#include <linux/platform_device.h>
#include <linux/types.h>
#include <linux/io.h>
#include <mach/mt_gpio.h>

#define GPIO_POWER_EN GPIO123//

typedef struct {
int gpio_power;
}hello_priv;

Static ssize_t hello_set_power (struct device *dev,struct device_attribute *attr,const char *buf, size_t count)
{
hello_priv* PRV = dev_get_drvdata (dev);
if (' 0 ' = buf[0])//shutdown
{//process:pin Low-->high
Mt_set_gpio_out (Prv->gpio_power, Gpio_out_zero);
Msleep (1500);
Mt_set_gpio_out (Prv->gpio_power, Gpio_out_one);
PRINTK (kern_notice "Cong:%s:%s[%d]: buf=%s", __file__,__function__, __line__,buf);
}else if (' 1 ' = buf[0]