|
#include <linux/miscdevice.h> #include <linux/input.h> #include <linux/clk.h> #include <linux/delay.h> #include <asm/io.h> #include <asm/uaccess.h> #include <mach/map.h> #include <mach/gpio.h> //#include <mach/gpio-bank.h> #include <mach/regs-gpio.h> #include <plat/gpio-core.h> #include <plat/gpio-cfg.h> #include <plat/gpio-cfg-helpers.h> #define DEVICE_NAME "led" /* 应用程序执行ioctl(fd, cmd, arg)时的第2个参数 */ /*the second parameter that application program execute*/ #define IOCTL_GPIO_ON 1 #define IOCTL_GPIO_OFF 0 /* 用来指定LED所用的GPIO引脚 */ /*appoint the pin the LED will use*/ static unsigned long gpio_table [] = { S5PV210_GPC0(3), S5PV210_GPC0(4), }; /* 用来指定GPIO引脚的功能：输出 */ /*appoint the function of the pin:out put*/ static unsigned int gpio_cfg_table [] = { S3C_GPIO_SFN(1), S3C_GPIO_SFN(1), }; //static char gpio_name[][]={{"GPC0_3"},{"GPC0_4"}}; #ifdef CONFIG_TQ210_DEBUG_LEDS static void tq210_debug_leds(unsigned int cmd,unsigned long arg) { gpio_direction_output(gpio_table[arg], cmd); //s3c_gpio_setpin(gpio_table[arg], cmd); } static void toggle_led(unsigned int cmd,unsigned long arg) { int loop=0; printk("%s : led %ld toggle now: \n",__func__,arg); for(;loop<11;loop++) { cmd = loop%2; printk("leds %d %s \n",arg+1,(cmd)?"on":"o ff"); tq210_debug_leds(cmd,arg); mdelay(1000); } } #endif /** *函数功能：打开/dev/led设备，设备名是：/dev/led *fuction:open /dev/led device ,devce name: /dev/led **/ static int tq210_gpio_open(struct inode *inode, struct file *file) { int i; int err; err = gpio_request(gpio_table[0], "GPC0_3"); if(err) { printk(KERN_ERR "failed to request GPC0_3 for LVDS PWDN pin\n"); return err; } err = gpio_request(gpio_table[1], "GPC0_4"); if(err) { printk(KERN_ERR "failed to request GPC0_4 for LVDS PWDN pin\n"); return err; } printk(KERN_INFO " leds opened\n"); for (i = 0; i < sizeof(gpio_table)/sizeof(unsigned long); i++) { s3c_gpio_cfgpin(gpio_table, gpio_cfg_table); gpio_direction_output(gpio_table, 0); //s3c_gpio_setpin(gpio_table, 0); } #ifdef CONFIG_TQ210_DEBUG_LEDS for (i = 0; i < sizeof(gpio_table)/sizeof(unsigned long); i++) { toggle_led(1,i); } #endif return 0; } /** *函数功能：用于控制led的亮灭 *fuction:control the led /turn on & turn off *控制字为cmd，arg为控制哪个灯的亮灭取值范围为0-1：cmd为IOCTL_GPIO_ON时亮，cmd为IOCTL_GPIO_OFF为灭 *control byte is cmd; arg appointed which led wile be turn on or off,it can be 0 and 1;IOCTL_GPIO_ON:turn on,IOCTL_GPIO_OFF:turn off. **/ static long tq210_gpio_ioctl( struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg) { arg -= 1; if (arg > sizeof(gpio_table)/sizeof(unsigned long)) { return -EINVAL; } switch(cmd) { case IOCTL_GPIO_ON: // 设置指定引脚的输出电平为1 gpio_direction_output(gpio_table[arg], 1); //s3c_gpio_setpin(gpio_table[arg], 1); return 0; case IOCTL_GPIO_OFF: // 设置指定引脚的输出电平为0 gpio_direction_output(gpio_table[arg], 0); //s3c_gpio_setpin(gpio_table[arg], 0); return 0; default: return -EINVAL; } } static int tq210_gpio_close(struct inode *inode, struct file *file) { gpio_free(gpio_table[0]); gpio_free(gpio_table[1]); printk(KERN_INFO "TQ210 LEDs driver successfully close\n"); return 0; } /*驱动接口设置*/ /*setting the interface of the driver*/ static struct file_operations dev_fops = { .owner = THIS_MODULE, .ioctl = tq210_gpio_ioctl, .open = tq210_gpio_open, .release = tq210_gpio_close, };
| 
楼主
