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Maison  >  Article  >  Tutoriel système  >  Modèle de pilote de périphérique Linux

Modèle de pilote de périphérique Linux

WBOY
WBOYoriginal
2024-07-22 18:54:35569parcourir

Modèle de pilote de périphérique Linux

Table des matières

Une variable d'environnement Linux, modèle de pilote de périphérique 1. L'origine du modèle de pilote de périphérique Linux

Revoyez d'abord le processus habituel de compilation des pilotes de périphérique

【1】Implémentez la fonction d'entrée module_init() et la fonction de déchargement de module module_exit();

【2】Demandez le numéro de périphérique, register_chrdev();----->

【3】Utilisez le mécanisme udev/mdev pour créer des nœuds de fichiers de périphérique class_create(), device_create();------>(liés au noyau)

【4】Initialisation du matériel : 1.io mappage des ressources ioremap(), le noyau fournit la fonction de bibliothèque gpio 2. Enregistrez l'interruption. ------->(Lié au matériel)

【5】Construisez la structure file_operation--------> (liée au noyau)

[6] Implémenter les méthodes de matériel d'exploitation xxx_open(), xxx_write()...

linux驱动编程_编程驱动聚水潭_编程驱动光谱仪

Inférence : non seulement la quatrième partie de l'ensemble du processus est liée au matériel, mais le reste est des opérations similaires. Afin de compiler facilement les pilotes de périphériques (sans réinventer la roue) et d'économiser de la main d'œuvre, le modèle de pilote de périphérique est proposé pour simplifier les périphériques. processus de compilation du pilote.

2. Cadre de modèle de pilote de périphérique

Vous pouvez visualiser l'objet bus via le système de fichiers virtuel sysfs (en prenant USB comme exemple)

在这里插入图片描述

二

Programmation du pilote Linux, programmation du modèle de bus BUS

Carte conceptuelle

1.Objet Bus

【1】structbus_type : établissement de formation Linux objet bus, décrit un bus, gère le périphérique et le pilote

programmation du pilote Linux, parfaitement adaptés. 

 <span class="token keyword">struct</span> bus_type <span class="token punctuation">{</span><span class="token comment">//只列举重要成员</span>
	<span class="token keyword">const</span> <span class="token keyword">char</span>		<span class="token operator">*</span>name<span class="token punctuation">;</span> <span class="token comment">//总线名字</span>
	<span class="token keyword">int</span> <span class="token punctuation">(</span><span class="token operator">*</span>match<span class="token punctuation">)</span><span class="token punctuation">(</span><span class="token keyword">struct</span> device <span class="token operator">*</span>dev<span class="token punctuation">,</span> <span class="token keyword">struct</span> device_driver <span class="token operator">*</span>drv<span class="token punctuation">)</span><span class="token punctuation">;</span><span class="token comment">//匹配方法</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span>

【2】Inscrivez-vous et déconnectez-vous du bus

<span class="token keyword">int</span> <span class="token function">bus_register</span><span class="token punctuation">(</span><span class="token keyword">struct</span> bus_type <span class="token operator">*</span>bus<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">void</span> <span class="token function">bus_unregister</span><span class="token punctuation">(</span><span class="token keyword">struct</span> bus_type <span class="token operator">*</span>bus<span class="token punctuation">)</span><span class="token punctuation">;</span>

【3】Construire un bus

 <span class="token macro property">#<span class="token directive keyword">include</span> <span class="token string"></span></span>
<span class="token macro property">#<span class="token directive keyword">include</span> <span class="token string"></span></span>
<span class="token macro property">#<span class="token directive keyword">include</span> <span class="token string"></span></span>
<span class="token comment">//实例化一个bus对象</span>
<span class="token keyword">struct</span> bus_type mybus <span class="token operator">=</span> <span class="token punctuation">{</span>
	<span class="token punctuation">.</span>name <span class="token operator">=</span> <span class="token string">"mybus"</span><span class="token punctuation">,</span>
	<span class="token punctuation">.</span>match <span class="token operator">=</span> mybus_match<span class="token punctuation">,</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span>
<span class="token function">EXPORT_SYMBOL</span><span class="token punctuation">(</span>mybus<span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">//导出总线对象，让device对象和driver对象使用</span>
	
<span class="token keyword">static</span> <span class="token keyword">int</span> __init <span class="token function">mybus_init</span><span class="token punctuation">(</span><span class="token keyword">void</span><span class="token punctuation">)</span>
<span class="token punctuation">{</span>
	<span class="token function">printk</span><span class="token punctuation">(</span><span class="token string">"------%s---------n"</span><span class="token punctuation">,</span>__FUNCTION__<span class="token punctuation">)</span><span class="token punctuation">;</span>
	<span class="token keyword">int</span> ret<span class="token punctuation">;</span>
	
	<span class="token comment">//构建一个总线结果:/sys/bus/mybus</span>
	ret <span class="token operator">=</span> <span class="token function">bus_register</span><span class="token punctuation">(</span><span class="token operator">&</span>mybus<span class="token punctuation">)</span><span class="token punctuation">;</span>
	<span class="token keyword">if</span><span class="token punctuation">(</span>ret <span class="token operator">!=</span> <span class="token number">0</span><span class="token punctuation">)</span>
	<span class="token punctuation">{</span>
		<span class="token function">printk</span><span class="token punctuation">(</span><span class="token string">"bus_register errorn"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
		<span class="token keyword">return</span> ret<span class="token punctuation">;</span>
	<span class="token punctuation">}</span>
	<span class="token keyword">return</span> <span class="token number">0</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token keyword">static</span> <span class="token keyword">void</span> __exit <span class="token function">mybus_exit</span><span class="token punctuation">(</span><span class="token keyword">void</span><span class="token punctuation">)</span>
<span class="token punctuation">{</span>
	<span class="token function">printk</span><span class="token punctuation">(</span><span class="token string">"------%s---------n"</span><span class="token punctuation">,</span>__FUNCTION__<span class="token punctuation">)</span><span class="token punctuation">;</span>
	<span class="token function">bus_unregister</span><span class="token punctuation">(</span><span class="token operator">&</span>mybus<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token function">module_init</span><span class="token punctuation">(</span>mybus_init<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">module_exit</span><span class="token punctuation">(</span>mybus_exit<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">MODULE_LICENSE</span><span class="token punctuation">(</span><span class="token string">"GPL"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

2.objet appareil

【1】objet appareil : objet appareil, décrivant les informations sur l'appareil, y compris l'adresse, l'interruption et d'autres données

<span class="token keyword">struct</span> device <span class="token punctuation">{</span><span class="token comment">//只列举重要成员</span>
	<span class="token keyword">struct</span> kobject kobj<span class="token punctuation">;</span> <span class="token comment">//所有对象的父类</span>
	<span class="token keyword">const</span> <span class="token keyword">char</span> <span class="token operator">*</span>init_name<span class="token punctuation">;</span><span class="token comment">//在/sys/bus/mybus/device的名字，用于在总线中匹配</span>
	<span class="token keyword">struct</span> bus_type	<span class="token operator">*</span>bus<span class="token punctuation">;</span>		 <span class="token comment">//指向该device对象依附的总线对象</span>
	<span class="token keyword">void</span> <span class="token operator">*</span>platform_data<span class="token punctuation">;</span>	 <span class="token comment">//自定义的数据，指向任何类型的数据</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span>

【2】Inscrivez-vous et déconnectez-vous du bus

<span class="token keyword">int</span> <span class="token function">device_register</span><span class="token punctuation">(</span><span class="token keyword">struct</span> device <span class="token operator">*</span>dev<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">void</span> <span class="token function">device_unregister</span><span class="token punctuation">(</span><span class="token keyword">struct</span> device <span class="token operator">*</span>dev<span class="token punctuation">)</span><span class="token punctuation">;</span>

【3】Écrire un objet appareil

linux驱动编程_编程驱动聚水潭_编程驱动光谱仪

定义一个描述设备的信息的结构体，匹配成功以后让driver对象在总线中领到device对象的信息，实现分离。

<span class="token macro property">#<span class="token directive keyword">include</span> <span class="token string"></span></span>
<span class="token macro property">#<span class="token directive keyword">include</span> <span class="token string"></span></span>
<span class="token macro property">#<span class="token directive keyword">include</span> <span class="token string"></span></span>
<span class="token keyword">extern</span> <span class="token keyword">struct</span> bus_type mybus<span class="token punctuation">;</span>
<span class="token keyword">struct</span> mydev_desc<span class="token punctuation">{</span>
	<span class="token keyword">char</span><span class="token operator">*</span> name<span class="token punctuation">;</span>
	<span class="token keyword">int</span> irqno<span class="token punctuation">;</span>
	<span class="token keyword">unsigned</span> <span class="token keyword">long</span> addr<span class="token punctuation">;</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span>
<span class="token keyword">struct</span> mydev_desc deviofo <span class="token operator">=</span> <span class="token punctuation">{</span>
	<span class="token punctuation">.</span>name <span class="token operator">=</span> <span class="token string">"hqs"</span><span class="token punctuation">,</span>
	<span class="token punctuation">.</span>irqno <span class="token operator">=</span> <span class="token number">8877</span><span class="token punctuation">,</span>
	<span class="token punctuation">.</span>addr <span class="token operator">=</span> <span class="token number">0x12345678</span><span class="token punctuation">,</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span>
<span class="token keyword">void</span> <span class="token function">mydev_release</span><span class="token punctuation">(</span><span class="token keyword">struct</span> device<span class="token operator">*</span> dev<span class="token punctuation">)</span>
<span class="token punctuation">{</span>
	<span class="token function">printk</span><span class="token punctuation">(</span><span class="token string">"------%s---------n"</span><span class="token punctuation">,</span>__FUNCTION__<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token comment">//构建一个device对象</span>
<span class="token keyword">struct</span> device mydev <span class="token operator">=</span> <span class="token punctuation">{</span>
	<span class="token punctuation">.</span>init_name <span class="token operator">=</span> <span class="token string">"fsdev_drv"</span><span class="token punctuation">,</span>
	<span class="token punctuation">.</span>bus <span class="token operator">=</span> <span class="token operator">&</span>mybus<span class="token punctuation">,</span>
	<span class="token punctuation">.</span>release <span class="token operator">=</span> mydev_release<span class="token punctuation">,</span>
	<span class="token punctuation">.</span>platform_data <span class="token operator">=</span> <span class="token operator">&</span>deviofo<span class="token punctuation">,</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span>
<span class="token keyword">static</span> <span class="token keyword">int</span> __init <span class="token function">mydev_init</span><span class="token punctuation">(</span><span class="token keyword">void</span><span class="token punctuation">)</span>
<span class="token punctuation">{</span>
	<span class="token function">printk</span><span class="token punctuation">(</span><span class="token string">"------%s---------n"</span><span class="token punctuation">,</span>__FUNCTION__<span class="token punctuation">)</span><span class="token punctuation">;</span>
	<span class="token keyword">int</span> ret<span class="token punctuation">;</span>
	<span class="token comment">//将device注册到总线中</span>
	ret <span class="token operator">=</span> <span class="token function">device_register</span><span class="token punctuation">(</span><span class="token operator">&</span>mydev<span class="token punctuation">)</span><span class="token punctuation">;</span>
	<span class="token keyword">if</span><span class="token punctuation">(</span>ret <span class="token operator"><</span> <span class="token number">0</span><span class="token punctuation">)</span>
	<span class="token punctuation">{</span>
		<span class="token function">printk</span><span class="token punctuation">(</span><span class="token string">"device_register errorn"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
		<span class="token keyword">return</span> ret<span class="token punctuation">;</span>
	<span class="token punctuation">}</span>
	<span class="token keyword">return</span> <span class="token number">0</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token keyword">static</span> <span class="token keyword">void</span> __exit <span class="token function">mydev_exit</span><span class="token punctuation">(</span><span class="token keyword">void</span><span class="token punctuation">)</span>
<span class="token punctuation">{</span>
	<span class="token function">printk</span><span class="token punctuation">(</span><span class="token string">"------%s---------n"</span><span class="token punctuation">,</span>__FUNCTION__<span class="token punctuation">)</span><span class="token punctuation">;</span>
	<span class="token function">device_unregister</span><span class="token punctuation">(</span><span class="token operator">&</span>mydev<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token function">module_init</span><span class="token punctuation">(</span>mydev_init<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">module_exit</span><span class="token punctuation">(</span>mydev_exit<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">MODULE_LICENSE</span><span class="token punctuation">(</span><span class="token string">"GPL"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

3.driver对象

【1】driver对象：描述设备驱动发的方式

<span class="token keyword">struct</span> device_driver <span class="token punctuation">{</span><span class="token comment">//只列举重要成员</span>
	<span class="token keyword">const</span> <span class="token keyword">char</span>		<span class="token operator">*</span>name<span class="token punctuation">;</span><span class="token comment">//在/sys/bus/mybus/driver的名字，用于在总线中匹配</span>
	<span class="token keyword">struct</span> bus_type		<span class="token operator">*</span>bus<span class="token punctuation">;</span><span class="token comment">//指向该device对象依附的总线对象</span>
	<span class="token keyword">int</span> <span class="token punctuation">(</span><span class="token operator">*</span>probe<span class="token punctuation">)</span> <span class="token punctuation">(</span><span class="token keyword">struct</span> device <span class="token operator">*</span>dev<span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">//device和driver匹配之后要做的事情</span>
	<span class="token keyword">int</span> <span class="token punctuation">(</span><span class="token operator">*</span>remove<span class="token punctuation">)</span> <span class="token punctuation">(</span><span class="token keyword">struct</span> device <span class="token operator">*</span>dev<span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">//device和driver分离之后要做的事情</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span>

【2】注册和注销总线

<span class="token keyword">int</span> <span class="token function">driver_register</span><span class="token punctuation">(</span><span class="token keyword">struct</span> device_driver <span class="token operator">*</span>drv<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">void</span> <span class="token function">driver_unregister</span><span class="token punctuation">(</span><span class="token keyword">struct</span> device_driver <span class="token operator">*</span>drv<span class="token punctuation">)</span><span class="token punctuation">;</span>

【3】编写driver对象

匹配成功以后可以在总线中领到device对象的数据，具体实现在probe函数里。

<span class="token macro property">#<span class="token directive keyword">include</span> <span class="token string"></span></span>
<span class="token macro property">#<span class="token directive keyword">include</span> <span class="token string"></span></span>
<span class="token macro property">#<span class="token directive keyword">include</span> <span class="token string"></span></span>
<span class="token macro property">#<span class="token directive keyword">include</span> <span class="token string"></span></span>
<span class="token keyword">extern</span> <span class="token keyword">struct</span> bus_type mybus<span class="token punctuation">;</span>
<span class="token keyword">struct</span> mydev_desc<span class="token punctuation">{</span>
	<span class="token keyword">char</span><span class="token operator">*</span> name<span class="token punctuation">;</span>
	<span class="token keyword">int</span> irqno<span class="token punctuation">;</span>
	<span class="token keyword">unsigned</span> <span class="token keyword">long</span> addr<span class="token punctuation">;</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span>
<span class="token keyword">struct</span> mydev_desc<span class="token operator">*</span> pdesc<span class="token punctuation">;</span>
<span class="token keyword">int</span> <span class="token function">mydrv_probe</span><span class="token punctuation">(</span><span class="token keyword">struct</span> device <span class="token operator">*</span>dev<span class="token punctuation">)</span>
<span class="token punctuation">{</span>
	<span class="token function">printk</span><span class="token punctuation">(</span><span class="token string">"------%s---------n"</span><span class="token punctuation">,</span>__FUNCTION__<span class="token punctuation">)</span><span class="token punctuation">;</span>
	pdesc <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token keyword">struct</span> mydev_desc<span class="token operator">*</span><span class="token punctuation">)</span>dev<span class="token operator">-></span>platform_data<span class="token punctuation">;</span>
	<span class="token function">printk</span><span class="token punctuation">(</span><span class="token string">"name =%sn"</span><span class="token punctuation">,</span>pdesc<span class="token operator">-></span>name<span class="token punctuation">)</span><span class="token punctuation">;</span>
	<span class="token function">printk</span><span class="token punctuation">(</span><span class="token string">"irqno = %dn"</span><span class="token punctuation">,</span>pdesc<span class="token operator">-></span>irqno<span class="token punctuation">)</span><span class="token punctuation">;</span>
	<span class="token keyword">unsigned</span> <span class="token keyword">long</span> <span class="token operator">*</span> paddr <span class="token operator">=</span> <span class="token function">ioremap</span><span class="token punctuation">(</span>pdesc<span class="token operator">-></span>addr<span class="token punctuation">,</span> <span class="token number">8</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
	<span class="token keyword">return</span> <span class="token number">0</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token keyword">int</span> mydrv_remove <span class="token punctuation">(</span><span class="token keyword">struct</span> device <span class="token operator">*</span>dev<span class="token punctuation">)</span>
<span class="token punctuation">{</span>
	<span class="token function">printk</span><span class="token punctuation">(</span><span class="token string">"------%s---------n"</span><span class="token punctuation">,</span>__FUNCTION__<span class="token punctuation">)</span><span class="token punctuation">;</span>
	<span class="token keyword">return</span> <span class="token number">0</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token comment">//构建一个driver对象</span>
<span class="token keyword">struct</span> device_driver mydrv <span class="token operator">=</span> <span class="token punctuation">{</span>
	<span class="token punctuation">.</span>name <span class="token operator">=</span> <span class="token string">"fsdev_drv"</span><span class="token punctuation">,</span>
	<span class="token punctuation">.</span>bus <span class="token operator">=</span> <span class="token operator">&</span>mybus<span class="token punctuation">,</span>
	<span class="token punctuation">.</span>probe <span class="token operator">=</span> mydrv_probe<span class="token punctuation">,</span>
	<span class="token punctuation">.</span>remove <span class="token operator">=</span> mydrv_remove<span class="token punctuation">,</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span>
<span class="token keyword">static</span> <span class="token keyword">int</span> __init <span class="token function">mydrv_init</span><span class="token punctuation">(</span><span class="token keyword">void</span><span class="token punctuation">)</span>
<span class="token punctuation">{</span>
	<span class="token function">printk</span><span class="token punctuation">(</span><span class="token string">"------%s---------n"</span><span class="token punctuation">,</span>__FUNCTION__<span class="token punctuation">)</span><span class="token punctuation">;</span>
	<span class="token keyword">int</span> ret<span class="token punctuation">;</span>
	<span class="token comment">//将device注册到总线中</span>
	ret <span class="token operator">=</span> <span class="token function">driver_register</span><span class="token punctuation">(</span><span class="token operator">&</span>mydrv<span class="token punctuation">)</span><span class="token punctuation">;</span>
	<span class="token keyword">if</span><span class="token punctuation">(</span>ret <span class="token operator"><</span> <span class="token number">0</span><span class="token punctuation">)</span>
	<span class="token punctuation">{</span>
		<span class="token function">printk</span><span class="token punctuation">(</span><span class="token string">"driver_register errorn"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
		<span class="token keyword">return</span> ret<span class="token punctuation">;</span>
	<span class="token punctuation">}</span>
	<span class="token keyword">return</span> <span class="token number">0</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token keyword">static</span> <span class="token keyword">void</span> __exit <span class="token function">mydrv_exit</span><span class="token punctuation">(</span><span class="token keyword">void</span><span class="token punctuation">)</span>
<span class="token punctuation">{</span>
	<span class="token function">printk</span><span class="token punctuation">(</span><span class="token string">"------%s---------n"</span><span class="token punctuation">,</span>__FUNCTION__<span class="token punctuation">)</span><span class="token punctuation">;</span>
	<span class="token function">driver_unregister</span><span class="token punctuation">(</span><span class="token operator">&</span>mydrv<span class="token punctuation">)</span><span class="token punctuation">;</span>	
<span class="token punctuation">}</span>
<span class="token function">module_init</span><span class="token punctuation">(</span>mydrv_init<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">module_exit</span><span class="token punctuation">(</span>mydrv_exit<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">MODULE_LICENSE</span><span class="token punctuation">(</span><span class="token string">"GPL"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

4.device对象和driver对象匹配

【1】实现BUS对象中的match方式（按device对象的名子和driver对象中的名子相匹配）

要注意的是不能直接用device对象中的init_name，而要用device对象中继承的structkobjectkobj;上面的成员name不然会报错

<span class="token keyword">int</span> <span class="token function">mybus_match</span><span class="token punctuation">(</span><span class="token keyword">struct</span> device <span class="token operator">*</span>dev<span class="token punctuation">,</span> <span class="token keyword">struct</span> device_driver <span class="token operator">*</span>drv<span class="token punctuation">)</span>
<span class="token punctuation">{</span>
	<span class="token comment">//如果匹配成功，match方法一定要返回一个1，失败返回0</span>
	<span class="token keyword">if</span><span class="token punctuation">(</span><span class="token operator">!</span> <span class="token function">strncmp</span><span class="token punctuation">(</span>drv<span class="token operator">-></span>name<span class="token punctuation">,</span>dev<span class="token operator">-></span>kobj<span class="token punctuation">.</span>name<span class="token punctuation">,</span><span class="token function">strlen</span><span class="token punctuation">(</span>drv<span class="token operator">-></span>name<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">)</span>
	<span class="token punctuation">{</span>
		<span class="token function">printk</span><span class="token punctuation">(</span><span class="token string">"match okn"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
		<span class="token keyword">return</span> <span class="token number">1</span><span class="token punctuation">;</span>
	<span class="token punctuation">}</span>
	<span class="token keyword">else</span>
	<span class="token punctuation">{</span>	
		<span class="token function">printk</span><span class="token punctuation">(</span><span class="token string">"match failedn"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
		<span class="token keyword">return</span> <span class="token number">0</span><span class="token punctuation">;</span>	 
	<span class="token punctuation">}</span>
	<span class="token keyword">return</span> <span class="token number">0</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token comment">//实例化一个bus对象</span>
<span class="token keyword">struct</span> bus_type mybus <span class="token operator">=</span> <span class="token punctuation">{</span>
	<span class="token punctuation">.</span>name <span class="token operator">=</span> <span class="token string">"mybus"</span><span class="token punctuation">,</span>
	<span class="token punctuation">.</span>match <span class="token operator">=</span> mybus_match<span class="token punctuation">,</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span>

【2】保证device对象和driver对象的名子一样：例如这儿都使用"fsdev_drv"才能保证能匹配成功

<span class="token comment">//构建一个device对象</span>
<span class="token keyword">struct</span> device mydev <span class="token operator">=</span> <span class="token punctuation">{</span>
	<span class="token punctuation">.</span>init_name <span class="token operator">=</span> <span class="token string">"fsdev_drv"</span><span class="token punctuation">,</span>
	<span class="token punctuation">.</span>bus <span class="token operator">=</span> <span class="token operator">&</span>mybus<span class="token punctuation">,</span>
	<span class="token punctuation">.</span>release <span class="token operator">=</span> mydev_release<span class="token punctuation">,</span>
	<span class="token punctuation">.</span>platform_data <span class="token operator">=</span> <span class="token operator">&</span>deviofo<span class="token punctuation">,</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span>


<span class="token comment">//构建一个driver对象</span>
<span class="token keyword">struct</span> device_driver mydrv <span class="token operator">=</span> <span class="token punctuation">{</span>
	<span class="token punctuation">.</span>name <span class="token operator">=</span> <span class="token string">"fsdev_drv"</span><span class="token punctuation">,</span>
	<span class="token punctuation">.</span>bus <span class="token operator">=</span> <span class="token operator">&</span>mybus<span class="token punctuation">,</span>
	<span class="token punctuation">.</span>probe <span class="token operator">=</span> mydrv_probe<span class="token punctuation">,</span>
	<span class="token punctuation">.</span>remove <span class="token operator">=</span> mydrv_remove<span class="token punctuation">,</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span>

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结构体 继承 对象 linux
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