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Linux驱动开发——正点原子I.MX6U驱动开发例程速通(四)

  • 2026-01-09 21:28:08
Linux驱动开发——正点原子I.MX6U驱动开发例程速通(四)

正点原子I.MX6U驱动例程速通(四)

前情说明:本文为正点原子I.MX6U 驱动开发篇代码总结,摘录了部分例程中主要的代码框架,完整代码及教程请参考正点原子官方。


Linux驱动开发——正点原子I.MX6U驱动开发例程速通(一)

Linux驱动开发——正点原子I.MX6U驱动开发例程速通(二)

Linux驱动开发——正点原子I.MX6U驱动开发例程速通(三)

本文对应《正点原子I.MX6U嵌入式Linux驱动开发指南》中的以下章节:

18_dtsplatform19_miscbeep20_input

为减少篇幅,部分框架重复内容使用...表示。


18_dtsplatform

1.probe函数

platform驱动的probe函数,当驱动与设备匹配后此函数就会执行

static int led_probe(struct platform_device *dev){        printk("led driver and device was matched!\r\n");    /* 1、设置设备号 */    if (leddev.major) {        leddev.devid = MKDEV(leddev.major, 0);        register_chrdev_region(leddev.devid, LEDDEV_CNT, LEDDEV_NAME);    } else {        alloc_chrdev_region(&leddev.devid, 0, LEDDEV_CNT, LEDDEV_NAME);        leddev.major = MAJOR(leddev.devid);    }    /* 2、注册设备      */    cdev_init(&leddev.cdev, &led_fops);    cdev_add(&leddev.cdev, leddev.devid, LEDDEV_CNT);    /* 3、创建类      */    leddev.class = class_create(THIS_MODULE, LEDDEV_NAME);    if (IS_ERR(leddev.class)) {        return PTR_ERR(leddev.class);    }    /* 4、创建设备 */    leddev.device = device_create(leddev.class, NULL, leddev.devid, NULL, LEDDEV_NAME);    if (IS_ERR(leddev.device)) {        return PTR_ERR(leddev.device);    }    /* 5、初始化IO */    leddev.node = of_find_node_by_path("/gpioled");    if (leddev.node == NULL){        printk("gpioled node nost find!\r\n");        return -EINVAL;    }     leddev.led0 = of_get_named_gpio(leddev.node, "led-gpio", 0);    if (leddev.led0 < 0) {        printk("can't get led-gpio\r\n");        return -EINVAL;    }    gpio_request(leddev.led0, "led0");    gpio_direction_output(leddev.led0, 1); /* led0 IO设置为输出,默认高电平    */    return 0;}

2.remove函数

platform驱动的remove函数,移除platform驱动的时此函数会执行

static int led_remove(struct platform_device *dev){    gpio_set_value(leddev.led0, 1);     /* 卸载驱动的时候关闭LED */    gpio_free(leddev.led0);                /* 释放IO             */    cdev_del(&leddev.cdev);                /*  删除cdev */    unregister_chrdev_region(leddev.devid, LEDDEV_CNT); /* 注销设备号 */    device_destroy(leddev.class, leddev.devid);    class_destroy(leddev.class);    return 0;}

3.匹配列表

static conststruct of_device_id led_of_match[] = {    { .compatible = "atkalpha-gpioled" },    { /* Sentinel */ }};

4.platform驱动结构体

staticstruct platform_driver led_driver = {    .driver        = {        .name    = "imx6ul-led",            /* 驱动名字,用于和设备匹配 */        .of_match_table    = led_of_match, /* 设备树匹配表          */    },    .probe        = led_probe,    .remove        = led_remove,};

5.入口函数

static int __init leddriver_init(void){    return platform_driver_register(&led_driver);}

6.出口函数

static void __exit leddriver_exit(void){    platform_driver_unregister(&led_driver);}

19_miscbeep

1.设备结构体

struct miscbeep_dev{    dev_t devid;                /* 设备号 */struct cdev cdev;            /* cdev */struct class *class;        /* 类 */struct device *device;        /* 设备 */struct device_node    *nd;     /* 设备节点 */    int beep_gpio;                /* beep所使用的GPIO编号 */};

2.设备操作函数

staticstruct file_operations miscbeep_fops = {    .owner = THIS_MODULE,    .open = miscbeep_open,    .write = miscbeep_write,};

3.MISC设备结构体

staticstruct miscdevice beep_miscdev = {    .minor = MISCBEEP_MINOR,    .name = MISCBEEP_NAME,    .fops = &miscbeep_fops,};

4.probe函数

platform驱动的probe函数,当驱动与设备匹配以后此函数就会执行

static int miscbeep_probe(struct platform_device *dev){    int ret = 0;    printk("beep driver and device was matched!\r\n");    /* 设置BEEP所使用的GPIO */    /* 1、获取设备节点:beep */    miscbeep.nd = of_find_node_by_path("/beep");    if(miscbeep.nd == NULL) {        printk("beep node not find!\r\n");        return -EINVAL;    }    /* 2、 获取设备树中的gpio属性,得到BEEP所使用的BEEP编号 */    miscbeep.beep_gpio = of_get_named_gpio(miscbeep.nd, "beep-gpio", 0);    if(miscbeep.beep_gpio < 0) {        printk("can't get beep-gpio");        return -EINVAL;    }    /* 3、设置GPIO5_IO01为输出,并且输出高电平,默认关闭BEEP */    ret = gpio_direction_output(miscbeep.beep_gpio, 1);    if(ret < 0) {        printk("can't set gpio!\r\n");    }    /* 一般情况下会注册对应的字符设备,但是这里我们使用MISC设备       * 所以我们不需要自己注册字符设备驱动,只需要注册misc设备驱动即可     */    ret = misc_register(&beep_miscdev);    if(ret < 0){        printk("misc device register failed!\r\n");        return -EFAULT;    }    return 0;}

5.remove函数

static int miscbeep_remove(struct platform_device *dev){    /* 注销设备的时候关闭LED灯 */    gpio_set_value(miscbeep.beep_gpio, 1);    /* 注销misc设备 */    misc_deregister(&beep_miscdev);    return 0;}

6.匹配列表

 static conststruct of_device_id beep_of_match[] = {     { .compatible = "atkalpha-beep" },     { /* Sentinel */ } };

7.platform驱动结构体

staticstruct platform_driver beep_driver = {     .driver     = {         .name   = "imx6ul-beep",         /* 驱动名字,用于和设备匹配 */         .of_match_table = beep_of_match, /* 设备树匹配表          */     },     .probe      = miscbeep_probe,     .remove     = miscbeep_remove,};

8.入口函数

static int __init miscbeep_init(void){    return platform_driver_register(&beep_driver);}

9.出口函数

static void __exit miscbeep_exit(void){    platform_driver_unregister(&beep_driver);}

20_input

1.设备结构体

struct keyinput_dev {    ...struct input_dev *inputdev;        /* input结构体 */};

2.定时器回调函数

void timer_function(unsigned long arg){    unsigned char value;    unsigned char num;struct irq_keydesc *keydesc;struct keyinput_dev *dev = (struct keyinput_dev *)arg;    num = dev->curkeynum;    keydesc = &dev->irqkeydesc[num];    value = gpio_get_value(keydesc->gpio);     /* 读取IO值 */    if(value == 0){                         /* 按下按键 */        /* 上报按键值 */        //input_event(dev->inputdev, EV_KEY, keydesc->value, 1);        input_report_key(dev->inputdev, keydesc->value, 1);/* 最后一个参数表示按下还是松开,1为按下,0为松开 */        input_sync(dev->inputdev);    } else {                                     /* 按键松开 */        //input_event(dev->inputdev, EV_KEY, keydesc->value, 0);        input_report_key(dev->inputdev, keydesc->value, 0);        input_sync(dev->inputdev);    }    }

3.按键IO初始化

static int keyio_init(void){    unsigned char i = 0;    char name[10];    int ret = 0;    keyinputdev.nd = of_find_node_by_path("/key");    if (keyinputdev.nd== NULL){        printk("key node not find!\r\n");        return -EINVAL;    }    /* 提取GPIO */    for (i = 0; i < KEY_NUM; i++) {        keyinputdev.irqkeydesc[i].gpio = of_get_named_gpio(keyinputdev.nd ,"key-gpio", i);        if (keyinputdev.irqkeydesc[i].gpio < 0) {            printk("can't get key%d\r\n", i);        }    }    /* 初始化key所使用的IO,并且设置成中断模式 */    for (i = 0; i < KEY_NUM; i++) {        memset(keyinputdev.irqkeydesc[i].name, 0, sizeof(name));    /* 缓冲区清零 */        sprintf(keyinputdev.irqkeydesc[i].name, "KEY%d", i);        /* 组合名字 */        gpio_request(keyinputdev.irqkeydesc[i].gpio, name);        gpio_direction_input(keyinputdev.irqkeydesc[i].gpio);            keyinputdev.irqkeydesc[i].irqnum = irq_of_parse_and_map(keyinputdev.nd, i);    }    /* 申请中断 */    keyinputdev.irqkeydesc[0].handler = key0_handler;    keyinputdev.irqkeydesc[0].value = KEY_0;    for (i = 0; i < KEY_NUM; i++) {        ret = request_irq(keyinputdev.irqkeydesc[i].irqnum, keyinputdev.irqkeydesc[i].handler,                          IRQF_TRIGGER_FALLING|IRQF_TRIGGER_RISING, keyinputdev.irqkeydesc[i].name, &keyinputdev);        if(ret < 0){            printk("irq %d request failed!\r\n", keyinputdev.irqkeydesc[i].irqnum);            return -EFAULT;        }    }    /* 创建定时器 */    init_timer(&keyinputdev.timer);    keyinputdev.timer.function = timer_function;    /* 申请input_dev */    keyinputdev.inputdev = input_allocate_device();    keyinputdev.inputdev->name = KEYINPUT_NAME;#if 0    /* 初始化input_dev,设置产生哪些事件 */    __set_bit(EV_KEY, keyinputdev.inputdev->evbit);    /* 设置产生按键事件          */    __set_bit(EV_REP, keyinputdev.inputdev->evbit);    /* 重复事件,比如按下去不放开,就会一直输出信息          */    /* 初始化input_dev,设置产生哪些按键 */    __set_bit(KEY_0, keyinputdev.inputdev->keybit);#endif#if 0    keyinputdev.inputdev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP);    keyinputdev.inputdev->keybit[BIT_WORD(KEY_0)] |= BIT_MASK(KEY_0);#endif    keyinputdev.inputdev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP);    input_set_capability(keyinputdev.inputdev, EV_KEY, KEY_0);    /* 注册输入设备 */    ret = input_register_device(keyinputdev.inputdev);    if (ret) {        printk("register input device failed!\r\n");        return ret;    }    return 0;}

4.入口函数

static int __init keyinput_init(void){    keyio_init();    return 0;}

5.出口函数

static void __exit keyinput_exit(void){    unsigned int i = 0;    /* 删除定时器 */    del_timer_sync(&keyinputdev.timer);    /* 删除定时器 */    /* 释放中断 */    for (i = 0; i < KEY_NUM; i++) {        free_irq(keyinputdev.irqkeydesc[i].irqnum, &keyinputdev);    }    /* 释放input_dev */    input_unregister_device(keyinputdev.inputdev);    input_free_device(keyinputdev.inputdev);}

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  1. CONNECT:[ UseTime:0.000634s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000896s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000325s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000319s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000475s ]
  6. SELECT * FROM `set` [ RunTime:0.000184s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000573s ]
  8. SELECT * FROM `article` WHERE `id` = 460874 LIMIT 1 [ RunTime:0.000948s ]
  9. UPDATE `article` SET `lasttime` = 1770569062 WHERE `id` = 460874 [ RunTime:0.003158s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.000257s ]
  11. SELECT * FROM `article` WHERE `id` < 460874 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000448s ]
  12. SELECT * FROM `article` WHERE `id` > 460874 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.004189s ]
  13. SELECT * FROM `article` WHERE `id` < 460874 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001317s ]
  14. SELECT * FROM `article` WHERE `id` < 460874 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001060s ]
  15. SELECT * FROM `article` WHERE `id` < 460874 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002259s ]
0.084493s