LED灯显示字符驱动程序-linux2.6LED显示驱动

/**************************************************************** Copyright(c) 2009-2010,Newkoom Net Tech.Co,.Ltd 模块名称(Filename): led_s3c2410.c 项目名称(Projectname): RPM(Remote Power Manager System) 版本号(Version): 1.0.0 创建日期(Date): 2009-8-22 作者(Author): ZMF(Zheng meifu) 功能描述(Description): led driver for linux2.6.14.1 其他说明(Others): 修改记录(History):****************************************************************/#include <linux/module.h>#include <linux/types.h>#include <linux/fs.h>#include <linux/errno.h>#include <linux/mm.h>#include <linux/sched.h>#include <linux/init.h>#include <linux/cdev.h>#include <linux/input.h>#include <linux/interrupt.h>#include <asm/io.h>#include <asm/system.h>#include <asm/uaccess.h>#include <asm/arch/regs-gpio.h>#include <asm/arch/hardware.h>#include <linux/devfs_fs_kernel.h>

//#defineCONFIG_TARGET_RPM // 注释掉则led 驱动程序为YL2410开发板。// 此参数已在内核配置里定义了，此处为调试目的//定义则为RPM实际目标板

#define DEVICE_NAME "ledrpm"#defineLEDRPM_MAJOR 223

#ifndef CONFIG_TARGET_RPM#define LEDRPM_NUM 4 //ledrpm num #else#define LEDRPM_NUM 6 //ledrpm num #endif#defineLEDRPM_ON 0#defineLEDRPM_OFF 1#define LEDRPM_DELAYMS(X) (HZ/(1000/(X)))//#defineLEDRPM_DEBUG#ifdefLEDRPM_DEBUG#definePRINTK(arg…) printk(arg)#else#definePRINTK(arg…) do{}while(0)#endiftypedef unsigned int LEDRPM_RET;struct ledrpm_dev_t{ struct cdev cdev;struct timer_list timer;#ifdefCONFIG_DEVFS_FSint devfs;#endif};struct ledrpm_info{ unsigned int pin;//gpio port unsigned int pin_setting; int ledrpm_code;//ledrpm value};static dev_t ledrpm_major=LEDRPM_MAJOR;struct ledrpm_dev_t ledrpm_dev;static const struct ledrpm_info ledrpm_info_tab[] = {#ifndef CONFIG_TARGET_RPM{S3C2410_GPF4,S3C2410_GPF4_OUTP,LEDRPM_ON}, { S3C2410_GPF5,S3C2410_GPF5_OUTP,LEDRPM_OFF}, { S3C2410_GPF6,S3C2410_GPF6_OUTP,LEDRPM_ON}, { S3C2410_GPF7,S3C2410_GPF7_OUTP,LEDRPM_OFF}, #else{S3C2410_GPD0,S3C2410_GPD0_OUTP,LEDRPM_ON}, { S3C2410_GPD1,S3C2410_GPD1_OUTP,LEDRPM_ON}, { S3C2410_GPD2,S3C2410_GPD2_OUTP,LEDRPM_ON}, { S3C2410_GPD3,S3C2410_GPD3_OUTP,LEDRPM_ON}, {S3C2410_GPD4,S3C2410_GPD4_OUTP,LEDRPM_ON}, { S3C2410_GPD5,S3C2410_GPD5_OUTP,LEDRPM_ON}, #endif};#ifndefCONFIG_TARGET_RPM#define GPIO_LEDPOWER (S3C2410_GPB0)#define GPIO_LEDPOWER_INP (S3C2410_GPB0_INP)#define GPIO_LEDPOWER_OUTP (S3C2410_GPB0_OUTP)#define GPIO_LED01 (S3C2410_GPF4) #define GPIO_LED01IN(S3C2410_GPF4_INP)#define GPIO_LED01OU(S3C2410_GPF4_OUTP)#define GPIO_LED02 (S3C2410_GPF5) #define GPIO_LED02IN(S3C2410_GPF5_INP)#define GPIO_LED02OU(S3C2410_GPF5_OUTP)#define GPIO_LED03 (S3C2410_GPF6) #define GPIO_LED03IN(S3C2410_GPF6_INP)#define GPIO_LED03OU(S3C2410_GPF6_OUTP)#define GPIO_LED04 (S3C2410_GPF7) #define GPIO_LED04IN(S3C2410_GPF7_INP)#define GPIO_LED04OU(S3C2410_GPF7_OUTP)#define GPIO_LED05 (S3C2410_GPB0) #define GPIO_LED05IN(S3C2410_GPB0_INP)#define GPIO_LED05OU(S3C2410_GPB0_OUTP)#define GPIO_LED06 (S3C2410_GPB0) #define GPIO_LED06IN(S3C2410_GPB0_INP)#define GPIO_LED06OU(S3C2410_GPB0_OUTP)

#else#define GPIO_LEDPOWER (S3C2410_GPG10)#define GPIO_LEDPOWER_INP (S3C2410_GPG10_INP)#define GPIO_LEDPOWER_OUTP (S3C2410_GPG10_OUTP)#define GPIO_LED01 (S3C2410_GPD0) #define GPIO_LED01IN(S3C2410_GPD0_INP)#define GPIO_LED01OU(S3C2410_GPD0_OUTP)#define GPIO_LED02 (S3C2410_GPD1) #define GPIO_LED02IN(S3C2410_GPD1_INP)#define GPIO_LED02OU(S3C2410_GPD1_OUTP)#define GPIO_LED03 (S3C2410_GPD2) #define GPIO_LED03IN(S3C2410_GPD2_INP)#define GPIO_LED03OU(S3C2410_GPD2_OUTP)#define GPIO_LED04 (S3C2410_GPD3) #define GPIO_LED04IN(S3C2410_GPD3_INP)#define GPIO_LED04OU(S3C2410_GPD3_OUTP)#define GPIO_LED05 (S3C2410_GPD4) #define GPIO_LED05IN(S3C2410_GPD4_INP)#define GPIO_LED05OU(S3C2410_GPD4_OUTP)#define GPIO_LED06 (S3C2410_GPD5) #define GPIO_LED06IN(S3C2410_GPD5_INP)#define GPIO_LED06OU(S3C2410_GPD5_OUTP)#endifstatic void ledrpm_timer_handler(unsigned long data);static int ledrpm_control(u32 command, u8 data);static int ledrpm_open(struct inode *inode, struct file *filp);static int ledrpm_release(struct inode *inode, struct file *filp);static ssize_t ledrpm_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos);static ssize_t ledrpm_read(struct file *file,char __user *buffer, size_t count, loff_t *ppos);static int ledrpm_ioctl(struct inode *inode, struct file *filp, unsigned int command, unsigned long arg);

static const struct file_operations ledrpm_fops ={ .owner = THIS_MODULE, .read = ledrpm_read, .write = ledrpm_write, .open = ledrpm_open, .release = ledrpm_release, .ioctl= ledrpm_ioctl,};static int ledrpm_control(u32 command, u8 data){int err = 0;if(command==0x01) { // writeswitch(data){case 0x01: s3c2410_gpio_setpin(GPIO_LED01, LEDRPM_ON);break;case 0x81:s3c2410_gpio_setpin(GPIO_LED01, LEDRPM_OFF);break;case 0x02:s3c2410_gpio_setpin(GPIO_LED02, LEDRPM_ON);break;case 0x82:s3c2410_gpio_setpin(GPIO_LED02, LEDRPM_OFF);break;case 0x03:s3c2410_gpio_setpin(GPIO_LED03, LEDRPM_ON);break;case 0x83:s3c2410_gpio_setpin(GPIO_LED03, LEDRPM_OFF);break;case 0x04:s3c2410_gpio_setpin(GPIO_LED04, LEDRPM_ON);break;case 0x84:s3c2410_gpio_setpin(GPIO_LED04, LEDRPM_OFF);break;case 0x05:s3c2410_gpio_setpin(GPIO_LED05, LEDRPM_ON);break;case 0x85:s3c2410_gpio_setpin(GPIO_LED05, LEDRPM_OFF);break;case 0x06:s3c2410_gpio_setpin(GPIO_LED06, LEDRPM_ON);break;case 0x86:s3c2410_gpio_setpin(GPIO_LED06, LEDRPM_OFF);break;default:err = -1;break;}}else if(command==0x00) { // readswitch(data){case 0x01:err=s3c2410_gpio_getpin(GPIO_LED01); break;case 0x02:err=s3c2410_gpio_getpin(GPIO_LED02); break;case 0x03:err=s3c2410_gpio_getpin(GPIO_LED03); break;case 0x04:err=s3c2410_gpio_getpin(GPIO_LED04);break;case 0x05:err=s3c2410_gpio_getpin(GPIO_LED05);break;case 0x06:err=s3c2410_gpio_getpin(GPIO_LED06);break;default:err = -1;break;}}return err;}static int ledrpm_open(struct inode *inode, struct file *filp){ filp->private_data = &ledrpm_dev; PRINTK(KERN_NOTICE "ledrpm opened/n"); return 0;}static int ledrpm_release(struct inode *inode, struct file *filp){ PRINTK(KERN_NOTICE "ledrpm released/n"); return 0;}// 写参数为：count要写的灯数量，ppos为从第几个灯（小于灯数）开始写，// buffer:要写的灯的数据：01-06亮81-86灭static ssize_t ledrpm_write(struct file *filp, const char __user *buffer, size_t count, loff_t *ppos){ u8 ledrpm_ret[LEDRPM_NUM];int ri;if (count>LEDRPM_NUM)return -1;copy_from_user(ledrpm_ret, buffer, count);PRINTK(KERN_NOTICE "ledrpm write data count:%d/n",count);for(ri=0; ri<count; ri++){if(ledrpm_control(1, ledrpm_ret[ri])==-1)return -1;} return count;}// 读函数带入参数: count:为读灯个数，要为LEDRPM_NUM; buffer:读回数据// ppos:为从第一个灯算起第几个灯开始读。要为0。static ssize_t ledrpm_read(struct file *filp,char __user *buffer, size_t count, loff_t *ppos){ u8 ledrpm_ret[LEDRPM_NUM];int ri,rj;if (count>LEDRPM_NUM)return -1;for(ri=0; ri<count; ri++){rj=ledrpm_control(0, ri+1);if (rj==-1) return -1;ledrpm_ret[ri]=(rj ? 1: 0);} copy_to_user(buffer,(char*)&ledrpm_ret,count);PRINTK(KERN_NOTICE "ledrpm read data count:%d/n",count); return count;}static int ledrpm_ioctl(struct inode *inode, struct file *filp, unsigned int command, unsigned long arg){return ledrpm_control(arg, command);}static void ledrpm_timer_handler(unsigned long data){mod_timer(&ledrpm_dev.timer, jiffies+ LEDRPM_DELAYMS(500));s3c2410_gpio_setpin(GPIO_LEDPOWER, (s3c2410_gpio_getpin(GPIO_LEDPOWER))?0:1);}static void ledrpm_init_config(void){int result;for (result=0; result<LEDRPM_NUM; result++){s3c2410_gpio_cfgpin(ledrpm_info_tab[result].pin, ledrpm_info_tab[result].pin_setting);s3c2410_gpio_setpin(ledrpm_info_tab[result].pin, ledrpm_info_tab[result].ledrpm_code);}s3c2410_gpio_cfgpin(GPIO_LEDPOWER, GPIO_LEDPOWER_OUTP);init_timer(&ledrpm_dev.timer);ledrpm_dev.timer.expires = jiffies + LEDRPM_DELAYMS(500);ledrpm_dev.timer.function = ledrpm_timer_handler; ledrpm_dev.timer.data = 0x00;add_timer(&ledrpm_dev.timer);}

static int __init ledrpm_init(void){int result,err;dev_t devno = MKDEV(ledrpm_major,0);if (ledrpm_major) {result = register_chrdev_region(devno, 1, DEVICE_NAME);}else {result = alloc_chrdev_region(&devno, 0, 1, DEVICE_NAME);ledrpm_major = MAJOR(devno);}if (result < 0) {printk("ledrpm can’t get major number:%d/n",result);return result;}devno = MKDEV(ledrpm_major,0);cdev_init((struct cdev *)&(ledrpm_dev.cdev),(struct file_operations *)&ledrpm_fops);ledrpm_dev.cdev.owner = THIS_MODULE;ledrpm_dev.cdev.ops = (struct file_operations *)&ledrpm_fops;err = cdev_add(&ledrpm_dev.cdev, devno, 1);if (err) {printk(KERN_NOTICE "Error %d adding ledrpm fail",err); return -1;}ledrpm_init_config();#ifdef CONFIG_DEVFS_FS devfs_mk_cdev(MKDEV(ledrpm_major, 0), S_IFCHR|S_IRUSR|S_IWUSR|S_IRGRP, DEVICE_NAME);ledrpm_dev.devfs = devfs_register_tape(DEVICE_NAME);#endif printk(KERN_NOTICE "/dev/ledrpm inited: newkoom company:zhengmeifu@sina.com/n");return 0;}static void __exit ledrpm_exit(void){cdev_del(&ledrpm_dev.cdev);unregister_chrdev_region(MKDEV(ledrpm_major,0),1);#ifdef CONFIG_DEVFS_FS devfs_remove(DEVICE_NAME); devfs_unregister_tape(ledrpm_dev.devfs);#endif del_timer(&ledrpm_dev.timer);}

module_init(ledrpm_init);module_exit(ledrpm_exit);

MODULE_AUTHOR("zhengmeifu@sina.com");MODULE_DESCRIPTION("RPM or (yls3c2410 devlp board) led driver");MODULE_LICENSE("Dual BSD/GPL");

要愈合不能，要忘却不能，要再次拥抱，却鼓不起足够的勇气，