mini2440Led驱动——linux-3.10.59

最新推荐文章于 2023-03-29 18:09:08 发布

viewsky11

最新推荐文章于 2023-03-29 18:09:08 发布

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分类专栏：嵌入式文章标签： Linux mini2440 linux kernel

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本文详细介绍了如何在Linux3.10.59系统中实现mini2440微控制器的LED驱动，包括初始化GPIO配置、LED状态控制及设备文件操作。

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mini2440的led驱动，linux3.10.59

/* linux/drivers/char/mini2440_leds.c
 *	Copyright (c) 2013 Feng Guoqing
 *
 * mini2440 LEDs Driver
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file COPYING in the main directory of this archive for
 * more details.
 *
*/

#include <linux/miscdevice.h> 
#include <linux/delay.h> 
#include <asm/irq.h> 
#include <mach/regs-gpio.h> 
#include <mach/hardware.h> 
#include <linux/kernel.h> 
#include <linux/module.h> 
#include <linux/init.h> 
#include <linux/mm.h> 
#include <linux/fs.h> 
#include <linux/types.h> 
#include <linux/delay.h> 
#include <linux/moduleparam.h> 
#include <linux/slab.h> 
#include <linux/errno.h> 
#include <linux/ioctl.h> 
#include <linux/cdev.h> 
#include <linux/string.h> 
#include <linux/list.h> 
#include <linux/pci.h> 
#include <linux/gpio.h> 
#include <asm/uaccess.h> 
#include <asm/atomic.h> 
#include <asm/unistd.h> 

#define DEVICE_NAME "leds"

static unsigned long led_table [] = { 
    S3C2410_GPB(5), 
    S3C2410_GPB(6), 
    S3C2410_GPB(7), 
    S3C2410_GPB(8), 
};

static unsigned int led_cfg_table [] = { 
    S3C2410_GPIO_OUTPUT, 
    S3C2410_GPIO_OUTPUT, 
    S3C2410_GPIO_OUTPUT, 
    S3C2410_GPIO_OUTPUT, 
};

static int sbc2440_leds_ioctl( 
    struct file *file,  
    unsigned int cmd, 
    unsigned long arg) 
{ 
    switch(cmd) { 
        case 0: 
        case 1: 
            if (arg > 4) { 
                return -EINVAL; 
            } 
            gpio_set_value(led_table[arg], !cmd); 
            return 0;
        default: 
            return -EINVAL; 
    } 
}

static struct file_operations dev_fops = { 
    .owner = THIS_MODULE, 
    .unlocked_ioctl = sbc2440_leds_ioctl,
};

static struct miscdevice misc = { 
    .minor = MISC_DYNAMIC_MINOR, 
    .name = DEVICE_NAME, 
    .fops = &dev_fops, 
};

static int __init dev_init(void) 
{ 
    int ret; 
    int i;
        
    for (i = 0; i < 4; i++) { 
        s3c_gpio_cfgpin(led_table[i], led_cfg_table[i]); 
        gpio_set_value(led_table[i], 0); 
    } 
    ret = misc_register(&misc); 
    printk (DEVICE_NAME"\tinitialized\n");
    
    return ret; 
} 
static void __exit dev_exit(void) 
{ 
    misc_deregister(&misc); 
} 

module_init(dev_init);
module_exit(dev_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("FriendlyARM Inc.");