tiny 4412 led module

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led.c

#include <linux/init.h>  #include <linux/kernel.h>  #include <linux/module.h>  #include <linux/io.h>  #include <linux/fs.h>  #include <linux/ioctl.h>  #include <linux/miscdevice.h>  #define DEVICE_NAME     "tiny4412-leds"  #define GPM4CON     (0x11000000+0x02E0)  #define GPM4DAT     (0x11000000+0x02E4)  #define GPM4_0  0  #define GPM4_1  1  #define GPM4_2  2  #define GPM4_3  3  #define GPM4_ON     0  #define GPM4_OFF    1  //幻数  #define LEDS_MAGIC  'a'  #define LEDS_PGM4_0_ON      _IO(LEDS_MAGIC, 1)  #define LEDS_PGM4_0_OFF _IO(LEDS_MAGIC, 2)  #define LEDS_PGM4_1_ON      _IO(LEDS_MAGIC, 3)  #define LEDS_PGM4_1_OFF _IO(LEDS_MAGIC, 4)  #define LEDS_PGM4_2_ON      _IO(LEDS_MAGIC, 5)  #define LEDS_PGM4_2_OFF _IO(LEDS_MAGIC, 6)  #define LEDS_PGM4_3_ON      _IO(LEDS_MAGIC, 7)  #define LEDS_PGM4_3_OFF _IO(LEDS_MAGIC, 8)  unsigned int *gpm4_con = NULL;  unsigned int *gpm4_dat = NULL;  /* 设置IO口输出电平 */  static void set_gmp4_out(unsigned char cpm4_n, unsigned char status)   {      unsigned int temp;      temp = readl(gpm4_dat);      if (status == GPM4_ON)           temp &=  ~(0x1<<cpm4_n);       else          temp |= 0x1<<cpm4_n;      writel(temp, gpm4_dat);  }  static long tiny4412_leds_ioctl(struct file *file, unsigned int cmd,                  unsigned long arg)  {      switch (cmd) {      case LEDS_PGM4_0_ON:  set_gmp4_out(GPM4_0, GPM4_ON);          break;      case LEDS_PGM4_0_OFF: set_gmp4_out(GPM4_0, GPM4_OFF);          break;      case LEDS_PGM4_1_ON:  set_gmp4_out(GPM4_1, GPM4_ON);          break;      case LEDS_PGM4_1_OFF: set_gmp4_out(GPM4_1, GPM4_OFF);          break;      case LEDS_PGM4_2_ON:  set_gmp4_out(GPM4_2, GPM4_ON);          break;      case LEDS_PGM4_2_OFF: set_gmp4_out(GPM4_2, GPM4_OFF);          break;      case LEDS_PGM4_3_ON:  set_gmp4_out(GPM4_3, GPM4_ON);          break;      case LEDS_PGM4_3_OFF: set_gmp4_out(GPM4_3, GPM4_OFF);          break;      defautl :          break;      }      return 0;  }  static const struct file_operations tiny4412_leds_fops = {      .owner      = THIS_MODULE,      .unlocked_ioctl = tiny4412_leds_ioctl,  };  static struct miscdevice tiny4412_leds_miscdev = {      .minor = MISC_DYNAMIC_MINOR,      .name = DEVICE_NAME,      .fops = &tiny4412_leds_fops,  };  static int tiny4412_leds_init(void)   {      unsigned int data;        unsigned int ret;      //IO初始化，将物理地址映射为虚拟地址      gpm4_con = ioremap(GPM4CON, 4);      gpm4_dat = ioremap(GPM4DAT, 4);      if (!gpm4_con || !gpm4_con) {          printk("ioremap faild!\n");          goto error1;       }      /* 将GPM4[0]-GPM4[3]设置为输出 */      data = readl(gpm4_con);        data &= ~((0xf<<12)|(0xf<<8)|(0xf<<4)|(0xf<<0));       data |=  (0x1<<12)|(0x1<<8)|(0x1<<4)|(0x1<<0);       writel(data, gpm4_con);       ret = misc_register(&tiny4412_leds_miscdev);  //注册混杂设备驱动      if (ret) {          printk("misc_register faild!\n");          goto error2;      }      printk("tiny4412_leds_init!\n");      return 0;  error2:      iounmap(gpm4_con);      iounmap(gpm4_dat);  error1:      return -ENOMEM;  }  static void tiny4412_leds_exit(void)  {      unsigned int data;      misc_deregister(&tiny4412_leds_miscdev);      data = readl(gpm4_dat);      data |=  (0x1<<3)|(0x1<<2)|(0x1<<1)|(0x1<<0);       writel(data, gpm4_dat);      iounmap(gpm4_con);      iounmap(gpm4_dat);      printk("tiny4412_leds_exit!\n");  }  MODULE_LICENSE("GPL");  MODULE_AUTHOR("ChunquanL");  module_init(tiny4412_leds_init);  module_exit(tiny4412_leds_exit);

led_test.c

#include <stdio.h>     #include <sys/types.h>    #include <sys/stat.h>  #include <fcntl.h>  #include <linux/ioctl.h>  #define DEVICE_NAME     "/dev/tiny4412-leds"  //幻数  #define LEDS_MAGIC  'a'  #define LEDS_PGM4_0_ON      _IO(LEDS_MAGIC, 1)  #define LEDS_PGM4_0_OFF _IO(LEDS_MAGIC, 2)  #define LEDS_PGM4_1_ON      _IO(LEDS_MAGIC, 3)  #define LEDS_PGM4_1_OFF _IO(LEDS_MAGIC, 4)  #define LEDS_PGM4_2_ON      _IO(LEDS_MAGIC, 5)  #define LEDS_PGM4_2_OFF _IO(LEDS_MAGIC, 6)  #define LEDS_PGM4_3_ON      _IO(LEDS_MAGIC, 7)  #define LEDS_PGM4_3_OFF _IO(LEDS_MAGIC, 8)  int main (int argc, char *argv[])   {      int leds_fd = 0;      int cmd;      if  (argc < 2) {          printf("please entry the correct operation parameter! \n");          return 0;      }      leds_fd = open(DEVICE_NAME, O_RDWR);      if (leds_fd == -1) {          printf("open device faild! \n");          return 0;      }       cmd = atoi(argv[1]);        //把终端上收到的字符串命令转换成整型      //printf("argv:%s \n", argv[1]);          /* 执行 ./led_oper 11 点亮LED1 ， 执行./led_oper 10 关闭LED1，其他LED灯以此类推 */      switch (cmd) {      case 10:  ioctl(leds_fd, LEDS_PGM4_0_OFF);          break;      case 11:  ioctl(leds_fd, LEDS_PGM4_0_ON);          break;      case 20:  ioctl(leds_fd, LEDS_PGM4_1_OFF);          break;      case 21:  ioctl(leds_fd, LEDS_PGM4_1_ON);          break;      case 30:  ioctl(leds_fd, LEDS_PGM4_2_OFF);          break;      case 31:  ioctl(leds_fd, LEDS_PGM4_2_ON);          break;      case 40:  ioctl(leds_fd, LEDS_PGM4_3_OFF);          break;      case 41:  ioctl(leds_fd, LEDS_PGM4_3_ON);          break;      defautl :          break;      }      close(leds_fd);      return 0;  }

Makefile

obj-m := led.o  KDIR :=/home/can//linux/4412/linux-3.8  # arm  all:      make -C $(KDIR) M=$(PWD) modules ARCH=arm CROSS_COMPILE=arm-linux-       arm-linux-gcc -static led_test.c -o led_testclean:      rm -f *.ko *.o *.mod.o *.mod.c *.symvers modul* *oper

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