GPIO.rar_GPIO 实现i2c_linux GPIO I2C

/* GPIO Push Button driver by ivan wang */ #include <linux/module.h> #include <linux/config.h> #include <linux/sched.h> #include <linux/kernel.h> #include <linux/init.h> #include <linux/interrupt.h> #include <linux/spinlock.h> #include <linux/proc_fs.h> #include <asm/uaccess.h> #include <asm/signal.h> #include "gpio.h" static struct proc_dir_entry *info_entry; int play_c=0; static pid_t mpid; struct file *filp; spinlock_t fgpio_lock; MODULE_AUTHOR("GM Corp."); MODULE_LICENSE("GM License"); gpio_params gm; void fgpio_play_next(void) { printk("Play Next\n"); /* send signal */ sys_kill(mpid,SIGUSR1); } void fgpio_play_enter(void) { printk("Play Enter\n"); /* send signal */ sys_kill(mpid,SIGUSR2); } void fgpio_play_switch(void) { printk("Play Switch\n"); /* send signal */ sys_kill(mpid,SIGPWR); } irqreturn_t gpio_interrupt_handler(int irq, void *dev_id, struct pt_regs *dummy) { //determine which GPIO int gpio_value,i,k; unsigned long flags; //printk("in...\n"); spin_lock_irqsave(&fgpio_lock,flags); #ifdef CONFIG_PLATFORM_GM8180 for(i = 0; i <= 50000; i++) { k = read_data_input(0,0x36); //if((k&0x3C) != 0x3C) // printk("4 = 0x%x\n",k); if((k & (1 << 1)) == 0) { gpio_value = 2; //printk("K1 is pressed\n"); break; } else if((k & (1 << 2)) == 0) { gpio_value = 1; //printk("K2 is pressed\n"); break; } else if((k & (1 << 4)) == 0) { gpio_value = 3; //printk("K3 is pressed\n"); break; } else if((k & (1 << 5)) == 0) { gpio_value = 4; //printk("K4 is pressed\n"); break; } } #elif defined(CONFIG_PLATFORM_GM8185) for(i = 0; i <= 50000; i++) { k = read_data_input(0,0x10); if((k & (1 << 4)) == 0) { gpio_value = 3; //printk("K3 is pressed\n"); break; } } #elif defined(CONFIG_PLATFORM_GM8120) for(k = 8; k <= 11; k++) { *(volatile unsigned int *)(GPIO_FTGPIO010_VA_BASE) = ~(1 << k); //printk("reg 0 = 0x%x, 4 = 0x%x\n",*(volatile unsigned int *)(GPIO_FTGPIO010_VA_BASE),*(volatile unsigned int *)(GPIO_FTGPIO010_VA_BASE+0x4)); if(((*(volatile unsigned int *)(GPIO_FTGPIO010_VA_BASE+0x4)) & 0x04000) == 0)//k1,k2,k3,k4 { gpio_value = k-8+1; printk("int %d\n",gpio_value); break; } } #endif if(gpio_value==1) //GPIO 1 fgpio_play_switch(); else if(gpio_value==2) //GPIO 2 fgpio_play_next(); else if(gpio_value==3) //GPIO 3 fgpio_play_enter(); #ifdef CONFIG_PLATFORM_GM8180 int_clear(0,0x36); #elif defined(CONFIG_PLATFORM_GM8185) int_clear(0,0x10); #else *(volatile unsigned int *)(GPIO_FTGPIO010_VA_BASE+0x30)=0xFFFF; //clear interrupt #endif spin_unlock_irqrestore(&fgpio_lock,flags); //for compiler optimize issue, must outside spinlock, otherwize do_irq fail #ifdef CONFIG_PLATFORM_GM8180 set_int(0,0x36,0x36); #elif defined(CONFIG_PLATFORM_GM8185) set_int(0,0x10,0x10); #elif defined(CONFIG_PLATFORM_GM8120) *(volatile unsigned int *)(GPIO_FTGPIO010_VA_BASE)=0xF0FF; // enable k1~k4 interrupt #endif return IRQ_HANDLED; } static int fgpio_atoi(char *s) { int k = 0; k = 0; while (*s != '\0' && *s >= '0' && *s <= '9') { k = 10 * k + (*s - '0'); s++; } return k; } static int proc_read_gpio_info(char *page, char **start,off_t off, int count,int *eof, void *data) { int len; len=sprintf(page,"%d\n",mpid); *eof=1; //end of file *start = page + off; //printk("mpid=%d len:%d off:%d\n",mpid,len,off); len=len-off; return len; } static int proc_write_gpio_info(struct file *file,const char *buffer,unsigned long count, void *data) { int len=count; unsigned char value[20]; if(copy_from_user(value,buffer,len)) return 0; value[len]='\0'; mpid=fgpio_atoi(value); // printk("mpid=%d %s count=%d\n",mpid,value,count); return count; } static int __init fgpio_init(void) { spin_lock_init(&fgpio_lock); mpid=0; /* info entry */ info_entry=create_proc_entry("gpio",777,0); if(info_entry==NULL) { printk("Fail to create proc entry: info!\n"); return 0; } info_entry->read_proc=proc_read_gpio_info; info_entry->write_proc=proc_write_gpio_info; info_entry->owner=THIS_MODULE; mpid=0; #ifdef CONFIG_PLATFORM_GM8180 gm.group=0; gm.int_enable=0x36; gm.int_trigger=0; gm.int_both=0; gm.int_riseneg=0x36; set_int(0,0x36,0x36); set_data_direct(0,0x36, 0); set_int_func(&gm); #elif defined(CONFIG_PLATFORM_GM8185) gm.group=0; gm.int_enable=0x10; gm.int_trigger=0; gm.int_both=0; gm.int_riseneg=0x10; set_int(0,0x10,0x10); set_data_direct(0,0x10, 0); set_int_func(&gm); #elif defined(CONFIG_PLATFORM_GM8120) *(volatile unsigned int *)(GPIO_FTGPIO010_VA_BASE+0x38)|=0xFF00; *(volatile unsigned int *)(GPIO_FTGPIO010_VA_BASE+0x8)|=0x0F00; *(volatile unsigned int *)(GPIO_FTGPIO010_VA_BASE+0x20)|=0xFF00; //enable interrupt #endif if(request_irq(GPIO_FTGPIO010_IRQ, gpio_interrupt_handler, SA_INTERRUPT,"gpio",0) < 0) printk(KERN_WARNING "GM GPIO: Unable to allocate IRQ %d\n",GPIO_FTGPIO010_IRQ); return 0; } static void __exit fgpio_exit(void) { #ifdef CONFIG_PLATFORM_GM8180 set_int(0,0x36,0); #elif defined(CONFIG_PLATFORM_GM8185) set_int(0,0x10,0); #else *(volatile unsigned int *)(GPIO_FTGPIO010_VA_BASE+0x20) = 0x0000; //disable interrupt #endif free_irq(GPIO_FTGPIO010_IRQ,0); remove_proc_entry("gpio",0); } module_init(fgpio_init); module_exit(fgpio_exit);