Android应用控制LED（动态编译）

/* linux/drivers/dmatek/pad4412_led/led.c * * DMATEK * lyp * 2016.04.12 * */ #include <linux/kernel.h> #include <linux/device.h> #include <linux/module.h> #include <linux/power_supply.h> #include <linux/delay.h> #include <linux/spinlock.h> #include <linux/interrupt.h> #include <linux/gpio.h> #include <linux/platform_device.h> #include <linux/timer.h> #include <linux/jiffies.h> #include <linux/irq.h> #include <linux/wakelock.h> #include <linux/err.h> #include <linux/errno.h> #include <asm/mach-types.h> #include <mach/hardware.h> #include <mach/gpio-dma4412.h> #include <plat/gpio-cfg.h> #include <plat/adc.h> #include <linux/memory.h> #include <linux/io.h> #include <linux/miscdevice.h> #include <linux/proc_fs.h> #include <linux/seq_file.h> #include <asm/uaccess.h> #define LED_ON 1 #define LED_OFF 0 #define LED_MAJOR 230 #define led_name "led" #define EXYNOS4412_BASEADDR 0x11400000 #define EXYNOS4412_GPK3CON (* (volatile unsigned int *)0x114000A0)//(EXYNOS4412_BASEADDR + 0xA0) #define EXYNOS4412_GPK3DAT (* (volatile unsigned int *)0x114000A4)//(EXYNOS4412_BASEADDR + 0xA4) #define GPIO_GPK3_LED18 EXYNOS4_GPK3(3) //led 18 #define GPIO_GPK3_LED19 EXYNOS4_GPK3(4) //led 19 static void led_off(int led_num) { //int gpk3dat; //gpk3dat = __raw_readl(EXYNOS4412_GPK3DAT); switch(led_num) { case 1: //led1 //gpk3dat &=~(1<<3); //D18 gpio_direction_output(GPIO_GPK3_LED18,0); break; case 2: //led2 //gpk3dat &=~(1<<4); //D19 gpio_direction_output(GPIO_GPK3_LED19,0); break; default: break; } //__raw_writel(gpk3dat,EXYNOS4412_GPK3DAT); } static void led_on(int led_num) { //int gpk3dat; //gpk3dat = __raw_readl(EXYNOS4412_GPK3DAT);//S3C_GPBDAT switch(led_num) { case 1: //led1 //gpk3dat |= (1<<3); //D18 gpio_direction_output(GPIO_GPK3_LED18,1); break; case 2: //led2 //gpk3dat |= (1<<4); //D19 gpio_direction_output(GPIO_GPK3_LED19,1); break; default: break; } //__raw_writel(gpk3dat,EXYNOS4412_GPK3DAT); } static ssize_t led_read(struct file *file, char __user *buf, size_t count, loff_t *offset) { return count; } static ssize_t led_write(struct file *file, const char __user *buf, size_t count, loff_t *offset) { return 0; } static int led_open(struct inode *inode, struct file *file) { printk("led_open +++++++1\n" ); gpio_direction_output(GPIO_GPK3_LED18,0); gpio_direction_output(GPIO_GPK3_LED19,0); /*unsigned int val; val = readl(EXYNOS4412_GPK3CON); val &= ~ (0xff <<0); val |= (1 << 12)|(1<<16); writel(val, EXYNOS4412_GPK3CON); //将GPK3和GPK4设置为输出模式 val = readl(EXYNOS4412_GPK3DAT); val &= ~ ((1 <<3)|(1<<4)); writel(val, EXYNOS4412_GPK3DAT); //将GPK3和GPK4置为低*/ printk("led_open -------1\n" ); return 0; } /* release command for led device file */ static int led_close(struct inode *inode, struct file *file) { // printk("led_close +++1\n"); return 0; } /* ioctl command for led device file */ //static int led_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg) static int led_ioctl(struct file *file, unsigned int cmd, unsigned long arg) { int ret = 0; int num; printk("cmd=%d\n",cmd); switch(cmd) { case LED_ON: //printk("&&&&&&&&&& LED ON &&&&&&&&&&&&&&\n"); ret = copy_from_user(&num, (int *)arg, sizeof(int)); if(ret != 0) { printk("gpio_ioctl: copy_from_user failed\n"); return(-EFAULT); } printk("--------LED ON,num = %d-----------\n",num); led_on(num); break; case LED_OFF: ret = copy_from_user(&num, (int *)arg, sizeof(int)); if(ret != 0) { printk("gpio_ioctl: copy_from_user failed\n"); return(-EFAULT); } printk("********LED OFF,num = %d**********\n",num); led_off(num); break; default: break; } return 0; } static const struct file_operations led_fops = { .owner = THIS_MODULE, .read = led_read, .write = led_write, .open = led_open, .release = led_close, .unlocked_ioctl = led_ioctl, }; static int __init led_init(void) { int retval; retval = register_chrdev(LED_MAJOR,led_name,&led_fops); if(retval < 0) { printk(KERN_WARNING "can't register major number %d\n",LED_MAJOR); return retval; } printk("LED driver register success!\n"); return 0; } static void __exit led_exit(void) { unregister_chrdev(LED_MAJOR,led_name); printk("LED driver release success!\n"); } module_init(led_init); module_exit(led_exit); MODULE_AUTHOR("lyp"); MODULE_DESCRIPTION("led driver"); MODULE_LICENSE("GPL");