文章目录

• 0.env
• 10. 简述
• 20. 测试源码
• • 1. driver
  • 2. device
  • • 2.1 方式一：DTS
    • 2.2 方式二：ACPI
    • 2.3 方式三：id table
    • 2.4 方式四：NAME
  • 3. 测试log

0.env

ARM 32bit
linux4.4.60

10. 简述

1. 主要讲述了几种device和driver匹配的方式以及demo框架
2. 文章不涉及数据处理部分，resource部分后续再补充

1. 匹配DTS （目前主流方式）
2. 匹配ACPI
3. 匹配id table
   3.1 . driver提供id table的数据，device提供一个id变量，遍历drvier中的id table来匹配
   3.2. device中platform_device.name 和 id_entry,name 要一致！
4. 匹配name
   4.1. 四种优先级中最低的一层，也是默认的方式，尽量在device中都放进去。

20. 测试源码

1. driver

1. id table这个成员不为空时，
   platfrom match就只能匹配前三种方式，默认的name就没法匹配了
2. 可以通过打开如下四个宏来查看各类匹配方式的区别

#define SUPPORT_DTS
#define SUPPORT_ACPI
#define SUPPORT_ID_TABLE
#define SUPPORT_DEV_NAME

#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include #define SUPPORT_DTS
#define SUPPORT_ACPI
#define SUPPORT_ID_TABLE
#define SUPPORT_DEV_NAME#ifndef SUPPORT_DEV_NAME
#define SUPPORT_DEV_NAME
#endif/* Add platform driver */
static int sc_liam_dri_probe(struct platform_device *pdev)
{pr_info("----- driver probe  -----\n");pr_info("dev id = %d\n", pdev->id);return 0;
}
static int sc_liam_dri_remove(struct platform_device *pdev)
{pr_info("----- driver remove -----\n");return 0;
}#ifdef SUPPORT_DTS
static const struct of_device_id sc_liam_of_match[] = {{   .compatible = "xxxx,sc_liam_dev"    },{   }
};
#endif
#ifdef SUPPORT_ACPI
#endif
#ifdef SUPPORT_ID_TABLE
static const struct platform_device_id sc_liam_id[] = {{   .name = "sc_liam_id_1", 0},{   .name = "sc_liam_id_2", 0},{   .name = "sc_liam_id_3", 0},{   }
};
#endifstatic struct platform_driver sc_liam_driver = {.probe = sc_liam_dri_probe,.remove = sc_liam_dri_remove,.driver     = {.name = "sc_liam",
#ifdef SUPPORT_DTS.of_match_table = sc_liam_of_match,
#endif
#ifdef SUPPORT_ACPI
#endif},
#ifdef SUPPORT_ID_TABLE.id_table   = sc_liam_id,
#endif
};#if 0
module_platform_driver(sc_liam_driver);
#else
static int __init sc_liam_dri_init(void)
{int err;pr_info("--- driver init ---\n");err = platform_driver_register(&sc_liam_driver);if (err){pr_info("--- driver init : fail ---\n");}return err;
}static void __exit sc_liam_dri_exit(void)
{pr_info("--- driver exit ---\n");platform_driver_unregister(&sc_liam_driver);
}module_init(sc_liam_dri_init);
module_exit(sc_liam_dri_exit);
#endif/* 5. module info */
MODULE_LICENSE("GPL v2"); 
MODULE_AUTHOR("liam"); 

2. device

2.1 方式一：DTS

1. DTS文件中：

1.1 在根节点（或者其他地方）添加一个node，
1.2 最基础的需要添加compatible 来匹配driver，
1.3 关于status：只有显式定义status状态为disabled才不使能这个设备，其他情况(包括不定义)都默认使能该设备。

2.2 方式二：ACPI

略

2.3 方式三：id table

1. #define SUPPORT_ID_TABLE，调试dev_1
2. 定义platform_device_id
3. name相同

#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include #define SUPPORT_ID_TABLEstatic void sc_liam_dev_release(struct device * dev)
{return ;
}#ifdef SUPPORT_ID_TABLE
static const struct platform_device_id sc_liam_id = {.name = "sc_liam_id_1" , // same with platform_device.name 
};
#endifstatic struct platform_device sc_liam_dev_1 = {.id = 1,
#ifdef SUPPORT_ID_TABLE.id_entry = &sc_liam_id,.name = "sc_liam_id_1",
#else.name = "sc_liam",
#endif.dev = {/* FIX : add release() if xxx_register() */.release = sc_liam_dev_release,}
};static struct platform_device sc_liam_dev_9 = {.id = 9,.name = "sc_liam",.dev = {/* FIX : add release() if xxx_register() */.release = sc_liam_dev_release,}
};/* mod_init */
static int __init sc_liam_dev_init(void)
{int err;printk("--- device init ---\n");err = platform_device_register(&sc_liam_dev_1);if (err){printk("--- device init : fail ---\n");
#ifdef SUPPORT_ID_TABLE}else{printk("device id_table.name = %s\n", sc_liam_dev_1.id_entry->name);
#endif}err = platform_device_register(&sc_liam_dev_9);if (err){printk("--- device init : fail ---\n");}return 0;
}/* mod_exit */
static void __exit sc_liam_dev_exit(void)
{platform_device_unregister(&sc_liam_dev_1);platform_device_unregister(&sc_liam_dev_9);printk("--- device exit ---\n");
}module_init(sc_liam_dev_init);
module_exit(sc_liam_dev_exit);/* module info */
MODULE_LICENSE("GPL v2"); 
MODULE_AUTHOR("liam"); 

2.4 方式四：NAME

4. name:
   上述源码中，打开/#define SUPPORT_ID_TABLE，调试dev_9

3. 测试log

使用的是id table来匹配的log

root@OpenWrt:/# 
root@OpenWrt:/# insmod sc_liam_driver.ko 
[ 3118.526703] --- driver init ---
root@OpenWrt:/# 
root@OpenWrt:/# insmod sc_liam_device.ko 
[ 3123.622959] --- device init ---
[ 3123.623265] ----- driver probe  -----
[ 3123.624902] dev id = 1
[ 3123.628770] device id_table.name = sc_liam_id_1
root@OpenWrt:/# 
root@OpenWrt:/# rmmod sc_liam_driver.ko 
module is not loaded
root@OpenWrt:/# rmmod sc_liam_dri
[ 3134.948927] --- driver exit ---
[ 3134.948976] ----- driver remove -----
root@OpenWrt:/# 
root@OpenWrt:/# rmmod sc_liam_dev
[ 3256.197876] --- device exit ---
root@OpenWrt:/#