OK6410ADC驱动及测试程序源码

#include <linux/wait.h> #include <linux/sched.h> #include <plat/regs-timer.h> #include <plat/regs-adc.h> #include <linux/device.h> #include <linux/errno.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/slab.h> #include <linux/input.h> #include <linux/init.h> #include <linux/serio.h> #include <linux/delay.h> #include <linux/platform_device.h> #include <linux/clk.h> #include <linux/fs.h> #include <linux/poll.h> #include <linux/irq.h> #include <linux/interrupt.h> #include <linux/cdev.h> #include <linux/miscdevice.h> #include <asm/uaccess.h> #include <asm/io.h> #include <asm/irq.h> #include <linux/pci.h> #include <mach/hardware.h> #include <mach/irqs.h> #include <mach/map.h> #include <mach/regs-clock.h> #include <mach/regs-gpio.h> #include <plat/gpio-cfg.h> #include <mach/gpio-bank-m.h> #include <mach/gpio-bank-c.h> #define ADC_MAJOR 0 /* ADC的主设备号 */ #define ADC_MINOR 0 /* ADC的次设备号 */ #define DEVICE_NAME "adc" /* 设备名 */ static int adc_major = ADC_MAJOR; static int adc_minor = ADC_MINOR; void *base; #define S3C6410_ADC_BASE 0x7E00B000 #define ADCCON (*(volatile unsigned long *)(base + 0x0)) #define ADCDAT0 (*(volatile unsigned long *)(base + 0xc)) /* adcDevs设备结构体. */ struct cdev cdev; dev_t dev = 0; int open_adc = 1; //当变量为1时配置adc寄存器，为0时复位寄存器 struct class *adc_class; typedef struct { int channel; int prescale; }MY_ADC_DEV; MY_ADC_DEV adcdev; int adc_open(struct inode *inode, struct file *filp) { printk(KERN_INFO "AD device opened\n"); unsigned int tmp; base = ioremap(S3C6410_ADC_BASE,32); if(open_adc) { adcdev.channel = 1; adcdev.prescale= 0xff; ADCCON = 0x00; ADCCON = ((1<<14)|(adcdev.prescale<<6)|(adcdev.channel<<3)); /* A/D转换结束(启动预定标器)，预分频值=0xff，输入通道为0 */ open_adc -= open_adc; } tmp = readl(S3C64XX_GPCCON); printk("%d\n",tmp); //tmp = (tmp & ~(0x7U<<1))|(0x1U); tmp = (tmp | (0x01<<0) | (0x01<<4) | (0x01<<8) | (0x01<<12) | (0x01<<16) | (0x01<<20)); printk("---tmp---%d\n",tmp); writel(tmp, S3C64XX_GPCCON); //tmp = 0x00; //tmp = (tmp | (0x3 <<4 )); writel(0x30,S3C64XX_GPCDAT); return 0; } static int adc_release(struct inode *node, struct file *file) { printk(KERN_INFO "AD device released\n"); ADCCON = 0x3fc4; return 0; } ssize_t adc_read(struct file *file,char __user *buff,size_t count,loff_t *fops) { int val; //char str[10]={0}; ADCCON |= 0x01; //开始转换 printk("xxxxxxxx\n"); while(!(ADCCON & 0x8000)); //不等于1.转换中 val = ADCDAT0 & 0x3ff; printk("--xxxxxxxx--\n"); // sprintf(str,"%4d", val); //printk(KERN_INFO "AD val = %d\n",val); copy_to_user(buff,&val,4); return 4; } ssize_t adc_write(struct file *filp, char __user *buff, size_t count, loff_t *fops) { char wbuf[4]; unsigned tmp; printk("#########write######\n"); copy_from_user(wbuf,buff,count); tmp = wbuf[0]; #if 1 switch(wbuf[0]) { case 0x36: tmp = 0x36;printk("%d\n",wbuf[0]);writel(tmp, S3C64XX_GPCDAT); break; case 0x3a: tmp = 0x3a;printk("%d\n",wbuf[0]); writel(tmp,S3C64XX_GPCDAT); break; case 0x39: tmp = 0x39;printk("%d\n",wbuf[0]);writel(tmp, S3C64XX_GPCDAT); break; case 0x35: tmp = 0x35;printk("%d\n",wbuf[0]);writel(tmp, S3C64XX_GPCDAT); break; case 0x30: printk("reset\n");break; default : break; } #endif return count; } /* file_operation结构体 */ static struct file_operations adc_fops = { .owner = THIS_MODULE, .open = adc_open, .release = adc_release, .read = adc_read, .write = adc_write, //.ioctl = adc_ioctl, }; /* ADC设备初始化 */ static void char_reg_setup_cdev (void) { int error; cdev_init(&cdev,&adc_fops); cdev.owner = THIS_MODULE; cdev.ops = &adc_fops; error = cdev_add(&cdev,dev,1); if(error) printk(KERN_NOTICE "Error %d adding char_reg_setup_cdev",error); } /* 加载ADC模块 */ static int adc_init(void) { int ret; dev = MKDEV(adc_major,adc_minor); if(adc_major) { ret = register_chrdev_region(dev,1,"adc"); //char_reg_setup_cdev(); } else { ret = alloc_chrdev_region(&dev,0,1,"adc"); adc_major = MAJOR(dev); } char_reg_setup_cdev(); if(ret<0) { printk(KERN_WARNING "LED:unable to get major %d\n", adc_major); return ret; } printk("ADC device installed,with major %d\n", adc_major); adc_class = class_create(THIS_MODULE,"ad_class"); if (IS_ERR(adc_class)) { printk("Err: failed in creating class.\n"); return 0; } device_create(adc_class, NULL, dev, NULL, "adc"); return 0; } /* 注销ADC模块 */ static void adc_exit(void) { //dev = MKDEV(adc_major,adc_minor); device_destroy(adc_class,dev); class_destroy(adc_class); cdev_del(&cdev); unregister_chrdev_region(dev,1); iounmap(base); printk("ADC device uninstalled\n"); } module_init(adc_init); module_exit(adc_exit); MODULE_LICENSE("GPL");