s3c2440-gpio.rar_linux gpio_s3c2440_s3c2440 gpio_scan

/*----------------------------------------------------------------------------- FILE : dev_gpio.c DESCRIPTION : Control GPIO F Port, GPG5, GPG11 Port of S3C2440. -------------------------------------------------------------------------------*/ #ifndef __KERNEL__ #define __KERNEL__ #endif #ifndef MODULE #define MODULE #endif #include <linux/module.h> #include <linux/kernel.h> #include <linux/version.h> #include <linux/init.h> #include <linux/fs.h> #include <linux/sched.h> #include <linux/interrupt.h> #include <linux/wait.h> #include <linux/ioport.h> #include <linux/slab.h> // kmalloc() #include <linux/poll.h> // poll #include <linux/proc_fs.h> #include <linux/irq.h> #include <linux/io.h> #include <linux/delay.h> #include <asm/system.h> #include <asm/uaccess.h> #include <asm/hardware.h> #include <asm/irq.h> #include <asm/ioctl.h> #include <asm/unistd.h> #include <asm/gpio.h> #include <asm/delay.h> #include <linux/i2c.h> #include <linux/i2c-dev.h> #include "dev_gpio.h" #define ON 1 #define OFF 0 static int usage = 0; static int showmsg = 0; static int major = GPIO_MAJOR_DEF; static int int_flag = 0; static void hw_gpio_init( void ) { // IRQT_FALLING, IRQT_RISING, IRQT_LOW, IRQT_HIGH^M gpio_direction_input( S3C2410_GPG5 ); set_irq_type( IRQ_EINT13, IRQT_RISING ); s3c2410_gpio_pullup( S3C2410_GPG5, 1 ); gpio_direction_input( S3C2410_GPG11 ); s3c2410_gpio_pullup( S3C2410_GPG11, 1 ); gpio_direction_output( S3C2410_GPF0, 1 ); gpio_direction_output( S3C2410_GPF1, 1 ); gpio_direction_output( S3C2410_GPF2, 1 ); gpio_direction_output( S3C2410_GPF3, 1 ); gpio_direction_output( S3C2410_GPF4, 1 ); gpio_direction_output( S3C2410_GPF5, 1 ); gpio_direction_output( S3C2410_GPF6, 1 ); gpio_direction_output( S3C2410_GPF7, 1 ); } static irqreturn_t gpio_btn_interrupt(int irq, void *dev_id) { printk("\n--> %s) Rising edge triggered interrupt irq [%d]", __FUNCTION__, irq); if( int_flag == 0 ) { s3c2410_gpio_setpin(S3C2410_GPF4, 0); int_flag = 1; } else { s3c2410_gpio_setpin(S3C2410_GPF4, 1); int_flag = 0; } return IRQ_HANDLED; } static ssize_t gpio_read(struct file *filp, char *buf, size_t count, loff_t *ppos) { unsigned char cc; int idx; int rtn = -1; cc = ( gpio_get_value( S3C2410_GPG11 ) >> 11 ); for (idx=0; idx<200; idx++) { rtn = -1; } if ( cc == ( gpio_get_value( S3C2410_GPG11 ) >> 11 ) ) { put_user( cc, buf ); } return 1; } void set_gpio_f( char gpnr, unsigned char val ) { switch( gpnr ) { case 0 : gpio_set_value( S3C2410_GPF0, val ); break; case 1 : gpio_set_value( S3C2410_GPF1, val ); break; case 2 : gpio_set_value( S3C2410_GPF2, val ); break; case 3 : gpio_set_value( S3C2410_GPF3, val ); break; case 4 : gpio_set_value( S3C2410_GPF4, val ); break; case 5 : gpio_set_value( S3C2410_GPF5, val ); break; case 6 : gpio_set_value( S3C2410_GPF6, val ); break; case 7 : gpio_set_value( S3C2410_GPF7, val ); break; default : break; } } static int gpio_ioctl( struct inode *inode, struct file *filp, unsigned int cmd, unsigned long arg ) { if( _IOC_TYPE( cmd ) != GPIO_IOCTL_MAGIC ) return -EINVAL; if( _IOC_NR ( cmd ) >= GPIO_IOCTL_MAGIC ) return -EINVAL; switch (cmd) { case IOCTL_GPIO_SET : set_gpio_f( arg, 1 ); return 0; case IOCTL_GPIO_CLR : set_gpio_f( arg, 0 ); return 0; } return -EINVAL; } static int gpio_open( struct inode *inode, struct file *filp ) { usage ++; if (showmsg) printk(" %s OPEN (%d)\n", DEV_NAME, usage ); return 0; } static int gpio_release( struct inode *inode, struct file *filp) { usage --; if (showmsg) printk(" %s CLOSE\n", DEV_NAME ); return 0; } static struct file_operations gpio_fops = { open : gpio_open, release : gpio_release, read : gpio_read, ioctl : gpio_ioctl, }; static __init int gpio_init( void ) { int ret; major &= 0xff; if( !register_chrdev( major, DEV_NAME, &gpio_fops ) ) { printk("\n register device %s OK (major=%d)\n\n", DEV_NAME, major ); } else { printk("\n unable to get major %d for %s \n\n", major, DEV_NAME ); return -EBUSY; } hw_gpio_init(); ret = request_irq( IRQ_EINT13, gpio_btn_interrupt, SA_INTERRUPT, "EINT-TEST", NULL ); if(ret) { printk( " %s : unable to get IRQ %d\n", DEV_NAME, IRQ_EINT13 ); goto fail; } return 0; fail: free_irq(IRQ_EINT13, NULL); return ret; } static __exit void gpio_exit( void ) { unregister_chrdev( major, DEV_NAME ); free_irq(IRQ_EINT13, NULL); printk("\n unregister %s OK\n\n", DEV_NAME ); } module_init(gpio_init); module_exit(gpio_exit); module_param(major, int, 0); module_param(showmsg, int, 0); MODULE_LICENSE("GPL"); /* end */