📄 basic_driver_completion.html
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html><head> <title></title> <link rel="stylesheet" media="screen" type="text/css" href="./style.css" /> <link rel="stylesheet" media="screen" type="text/css" href="./design.css" /> <link rel="stylesheet" media="print" type="text/css" href="./print.css" /> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /></head><body><a href=start.html>start</a></br><h4><a name="basic_driver_completion" id="basic_driver_completion">Basic Driver Completion</a></h4><div class="level4"><p>To complete the process of creating a basic device driver the <strong>fops</strong> table needs the <strong>open</strong>, <strong>close</strong>, <strong>read</strong> and <strong>write</strong> references completed.</p><p> This can be done in the <strong>module_init</strong> function.</p><p>Following this the driver needs to be added to the Kernel Configuration and Build System.</p><p>A modified <strong>module_init</strong> function is shown here</p><pre class="code c"> <span class="kw4">static</span> <span class="kw4">int</span> __init scmd_init<span class="br0">(</span><span class="kw4">void</span><span class="br0">)</span><span class="br0">{</span> <span class="kw4">int</span> ret; <span class="kw4">int</span> i; <span class="coMULTI">/* set up the initial data */</span> <span class="kw1">for</span> <span class="br0">(</span> i = <span class="nu0">0</span> ; i < SCMD_SIZE ; i++ <span class="br0">)</span> <span class="br0">{</span> scmd_data<span class="br0">[</span>i<span class="br0">]</span> = <span class="st0">'0'</span>+i; <span class="br0">}</span> <span class="co1">//SET_MODULE_OWNER(&scmd_driver_fops); //not now in 2.6 kernels</span> scmd_driver_fops.<span class="me1">read</span> = scmd_read; scmd_driver_fops.<span class="me1">write</span> = scmd_write; scmd_driver_fops.<span class="me1">open</span> = scmd_open; scmd_driver_fops.<span class="me1">release</span> = scmd_close; ret = register_chrdev<span class="br0">(</span>scmd_major, SCMD_DEV, &scmd_driver_fops<span class="br0">)</span>; printk<span class="br0">(</span><span class="st0">" Driver scmd_basic registered .. ret %d <span class="es0">\n</span>"</span>,ret<span class="br0">)</span>; <span class="kw1">if</span> <span class="br0">(</span> ret > <span class="nu0">0</span> <span class="br0">)</span> <span class="br0">{</span> scmd_major = ret; ret = <span class="nu0">0</span>; <span class="br0">}</span> <span class="kw1">return</span> ret; <span class="br0">}</span> </pre></div></body></html>⌨️ 快捷键说明
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