gpio.rar_GPIO driver DAVINCI_GPIO 驱动_dm6467_dm6467 gpio_dm6467

/* * linux/drivers/char/gpio_led/gpio_led.c * * gpio_led driver for the TI DAVINCI * * Copyright (c) 2006 Texas Instruments. * */ #include <linux/module.h> #include <linux/config.h> #include <linux/types.h> #include <linux/fs.h> #include <linux/mm.h> #include <linux/miscdevice.h> #include <linux/smp_lock.h> #include <linux/init.h> #include <asm/io.h> #include <asm/uaccess.h> #include <asm/bitops.h> #include <linux/moduleparam.h> #include <linux/errno.h> #include <linux/kernel.h> #include <linux/list.h> #include <linux/module.h> #include <linux/err.h> #include <linux/bitops.h> #include <asm/irq.h> #include <asm/io.h> #include <asm/hardware/clock.h> #include <asm/arch/irqs.h> #include <asm/arch/hardware.h> #include <asm/arch/gpio.h> #include <asm/arch/cpu.h> #include <asm/mach/irq.h> //10，130 = /dev/watchdog //10，131 = /dev/temperature //10，135 = /dev/rtc //10，151 = /dev/led #define GPIO_LED_MAJOR 10 //主设备号 #define GPIO_LED_MINOR 151 //次设备号 char led_data[10]; //static int timer_margin = TIMER_MARGIN_CFG_VAL; /* in seconds */ static int gpio_led_users; static struct miscdevice gpio_led_miscdev; /* Forward declaration */ /* * Allow only one person to hold it open */ static int gpio_led_open(struct inode *inode, struct file *file) { if(gpio_direction_output(0,0)) return -1; if(gpio_direction_output(1,0)) return -1; return 0; } static int gpio_led_release(struct inode *inode, struct file *file) { return 0; } static loff_t gpio_led_read(struct file *file, char *buf, size_t count, loff_t *offset) { return count; /* Not seekable */ } static ssize_t gpio_led_write(struct file *file, const char *data, size_t len, loff_t * ppos) { char val0,val1; copy_from_user(led_data,data,len); if((*led_data)>2) { printk("input value must less than 3\n"); return -1; } val0 = (*led_data) & 0x01; val1 = ((*led_data) & 0x02)>>1; gpio_set_value(0,val0); gpio_set_value(1,val1); return 0; } static int gpio_led_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg) { return 0; } static struct file_operations gpio_led_fops = { .owner = THIS_MODULE, .read = gpio_led_read, .write = gpio_led_write, .ioctl = gpio_led_ioctl, .open = gpio_led_open, .release = gpio_led_release, }; static struct miscdevice gpio_led_miscdev = { .minor = GPIO_LED_MINOR, .name = "gpio_led", .fops = &gpio_led_fops }; static int __init gpio_led_init(void) { int ret; if(gpio_request(0, NULL))//申请资源 { printk("request gpio 0 failed\n"); return -1; } if(gpio_request(1, NULL)) { printk("request gpio 1 failed\n"); gpio_free(0); return -1; } ret = misc_register(&gpio_led_miscdev); if (ret) return ret; return 0; } static void __exit gpio_led_exit(void) { gpio_free(0); gpio_free(1); misc_deregister(&gpio_led_miscdev); } module_init(gpio_led_init); module_exit(gpio_led_exit); MODULE_AUTHOR("Texas Instruments"); MODULE_LICENSE("GPL"); //module_param(timer_margin, int, 0);