lp.c

linux字符驱动源码

 <a name=L67 href="source/kernel/chr_drv/lp.c?v=0.97#L67">67</a>                         <a href="ident?v=0.97;i=LP_F">LP_F</a>(minor) &amp;= ~LP_SELEC;
 <a name=L68 href="source/kernel/chr_drv/lp.c?v=0.97#L68">68</a>                         return temp-<a href="ident?v=0.97;i=buf">buf</a>?temp-<a href="ident?v=0.97;i=buf">buf</a>:-<a href="ident?v=0.97;i=EFAULT">EFAULT</a>;
 <a name=L69 href="source/kernel/chr_drv/lp.c?v=0.97#L69">69</a>                 } else
 <a name=L70 href="source/kernel/chr_drv/lp.c?v=0.97#L70">70</a>                         <a href="ident?v=0.97;i=LP_F">LP_F</a>(minor) &amp;= ~LP_SELEC;
 <a name=L71 href="source/kernel/chr_drv/lp.c?v=0.97#L71">71</a> 
 <a name=L72 href="source/kernel/chr_drv/lp.c?v=0.97#L72">72</a>     <b><i>/* not offline or out of paper. on fire? */</i></b>
 <a name=L73 href="source/kernel/chr_drv/lp.c?v=0.97#L73">73</a>                 if (!(retval &amp; <a href="ident?v=0.97;i=LP_PERRORP">LP_PERRORP</a>)) {
 <a name=L74 href="source/kernel/chr_drv/lp.c?v=0.97#L74">74</a>                         <a href="ident?v=0.97;i=LP_F">LP_F</a>(minor) |= <a href="ident?v=0.97;i=LP_ERR">LP_ERR</a>;
 <a name=L75 href="source/kernel/chr_drv/lp.c?v=0.97#L75">75</a>                         return temp-<a href="ident?v=0.97;i=buf">buf</a>?temp-<a href="ident?v=0.97;i=buf">buf</a>:-<a href="ident?v=0.97;i=EIO">EIO</a>;
 <a name=L76 href="source/kernel/chr_drv/lp.c?v=0.97#L76">76</a>                 } else
 <a name=L77 href="source/kernel/chr_drv/lp.c?v=0.97#L77">77</a>                         <a href="ident?v=0.97;i=LP_F">LP_F</a>(minor) &amp;= ~LP_SELEC;
 <a name=L78 href="source/kernel/chr_drv/lp.c?v=0.97#L78">78</a>         }
 <a name=L79 href="source/kernel/chr_drv/lp.c?v=0.97#L79">79</a>         return temp-<a href="ident?v=0.97;i=buf">buf</a>;
 <a name=L80 href="source/kernel/chr_drv/lp.c?v=0.97#L80">80</a> }
 <a name=L81 href="source/kernel/chr_drv/lp.c?v=0.97#L81">81</a> 
 <a name=L82 href="source/kernel/chr_drv/lp.c?v=0.97#L82">82</a> static int <a href="ident?v=0.97;i=lp_read">lp_read</a>(struct <a href="ident?v=0.97;i=inode">inode</a> * <a href="ident?v=0.97;i=inode">inode</a>, struct <a href="ident?v=0.97;i=file">file</a> * <a href="ident?v=0.97;i=file">file</a>, char * <a href="ident?v=0.97;i=buf">buf</a>, int <a href="ident?v=0.97;i=count">count</a>)
 <a name=L83 href="source/kernel/chr_drv/lp.c?v=0.97#L83">83</a> {
 <a name=L84 href="source/kernel/chr_drv/lp.c?v=0.97#L84">84</a>         return -<a href="ident?v=0.97;i=EINVAL">EINVAL</a>;
 <a name=L85 href="source/kernel/chr_drv/lp.c?v=0.97#L85">85</a> }
 <a name=L86 href="source/kernel/chr_drv/lp.c?v=0.97#L86">86</a> 
 <a name=L87 href="source/kernel/chr_drv/lp.c?v=0.97#L87">87</a> static int <a href="ident?v=0.97;i=lp_lseek">lp_lseek</a>(struct <a href="ident?v=0.97;i=inode">inode</a> * <a href="ident?v=0.97;i=inode">inode</a>, struct <a href="ident?v=0.97;i=file">file</a> * <a href="ident?v=0.97;i=file">file</a>, <a href="ident?v=0.97;i=off_t">off_t</a> offset, int <a href="ident?v=0.97;i=origin">origin</a>)
 <a name=L88 href="source/kernel/chr_drv/lp.c?v=0.97#L88">88</a> {
 <a name=L89 href="source/kernel/chr_drv/lp.c?v=0.97#L89">89</a>         return -<a href="ident?v=0.97;i=EINVAL">EINVAL</a>;
 <a name=L90 href="source/kernel/chr_drv/lp.c?v=0.97#L90">90</a> }
 <a name=L91 href="source/kernel/chr_drv/lp.c?v=0.97#L91">91</a> 
 <a name=L92 href="source/kernel/chr_drv/lp.c?v=0.97#L92">92</a> static int <a href="ident?v=0.97;i=lp_open">lp_open</a>(struct <a href="ident?v=0.97;i=inode">inode</a> * <a href="ident?v=0.97;i=inode">inode</a>, struct <a href="ident?v=0.97;i=file">file</a> * <a href="ident?v=0.97;i=file">file</a>)
 <a name=L93 href="source/kernel/chr_drv/lp.c?v=0.97#L93">93</a> {
 <a name=L94 href="source/kernel/chr_drv/lp.c?v=0.97#L94">94</a>         unsigned int minor = <a href="ident?v=0.97;i=MINOR">MINOR</a>(<a href="ident?v=0.97;i=inode">inode</a>-&gt;i_rdev);
 <a name=L95 href="source/kernel/chr_drv/lp.c?v=0.97#L95">95</a> 
 <a name=L96 href="source/kernel/chr_drv/lp.c?v=0.97#L96">96</a>         if (minor &gt;= <a href="ident?v=0.97;i=LP_NO">LP_NO</a>)
 <a name=L97 href="source/kernel/chr_drv/lp.c?v=0.97#L97">97</a>                 return -<a href="ident?v=0.97;i=ENODEV">ENODEV</a>;
 <a name=L98 href="source/kernel/chr_drv/lp.c?v=0.97#L98">98</a>         if ((<a href="ident?v=0.97;i=LP_F">LP_F</a>(minor) &amp; <a href="ident?v=0.97;i=LP_EXIST">LP_EXIST</a>) == 0)
 <a name=L99 href="source/kernel/chr_drv/lp.c?v=0.97#L99">99</a>                 return -<a href="ident?v=0.97;i=ENODEV">ENODEV</a>;
<a name=L100 href="source/kernel/chr_drv/lp.c?v=0.97#L100">100</a>         if (<a href="ident?v=0.97;i=LP_F">LP_F</a>(minor) &amp; <a href="ident?v=0.97;i=LP_BUSY">LP_BUSY</a>)
<a name=L101 href="source/kernel/chr_drv/lp.c?v=0.97#L101">101</a>                 return -<a href="ident?v=0.97;i=EBUSY">EBUSY</a>;
<a name=L102 href="source/kernel/chr_drv/lp.c?v=0.97#L102">102</a>         <a href="ident?v=0.97;i=LP_F">LP_F</a>(minor) |= <a href="ident?v=0.97;i=LP_BUSY">LP_BUSY</a>;
<a name=L103 href="source/kernel/chr_drv/lp.c?v=0.97#L103">103</a>         return 0;
<a name=L104 href="source/kernel/chr_drv/lp.c?v=0.97#L104">104</a> }
<a name=L105 href="source/kernel/chr_drv/lp.c?v=0.97#L105">105</a> 
<a name=L106 href="source/kernel/chr_drv/lp.c?v=0.97#L106">106</a> static void <a href="ident?v=0.97;i=lp_release">lp_release</a>(struct <a href="ident?v=0.97;i=inode">inode</a> * <a href="ident?v=0.97;i=inode">inode</a>, struct <a href="ident?v=0.97;i=file">file</a> * <a href="ident?v=0.97;i=file">file</a>)
<a name=L107 href="source/kernel/chr_drv/lp.c?v=0.97#L107">107</a> {
<a name=L108 href="source/kernel/chr_drv/lp.c?v=0.97#L108">108</a>         unsigned int minor = <a href="ident?v=0.97;i=MINOR">MINOR</a>(<a href="ident?v=0.97;i=inode">inode</a>-&gt;i_rdev);
<a name=L109 href="source/kernel/chr_drv/lp.c?v=0.97#L109">109</a> 
<a name=L110 href="source/kernel/chr_drv/lp.c?v=0.97#L110">110</a>         <a href="ident?v=0.97;i=LP_F">LP_F</a>(minor) &amp;= ~LP_BUSY;
<a name=L111 href="source/kernel/chr_drv/lp.c?v=0.97#L111">111</a> }
<a name=L112 href="source/kernel/chr_drv/lp.c?v=0.97#L112">112</a> 
<a name=L113 href="source/kernel/chr_drv/lp.c?v=0.97#L113">113</a> static struct <a href="ident?v=0.97;i=file_operations">file_operations</a> <a href="ident?v=0.97;i=lp_fops">lp_fops</a> = {
<a name=L114 href="source/kernel/chr_drv/lp.c?v=0.97#L114">114</a>         <a href="ident?v=0.97;i=lp_lseek">lp_lseek</a>,
<a name=L115 href="source/kernel/chr_drv/lp.c?v=0.97#L115">115</a>         <a href="ident?v=0.97;i=lp_read">lp_read</a>,
<a name=L116 href="source/kernel/chr_drv/lp.c?v=0.97#L116">116</a>         <a href="ident?v=0.97;i=lp_write">lp_write</a>,
<a name=L117 href="source/kernel/chr_drv/lp.c?v=0.97#L117">117</a>         <a href="ident?v=0.97;i=NULL">NULL</a>,           <b><i>/* lp_readdir */</i></b>
<a name=L118 href="source/kernel/chr_drv/lp.c?v=0.97#L118">118</a>         <a href="ident?v=0.97;i=NULL">NULL</a>,           <b><i>/* lp_select */</i></b>
<a name=L119 href="source/kernel/chr_drv/lp.c?v=0.97#L119">119</a>         <a href="ident?v=0.97;i=NULL">NULL</a>,           <b><i>/* lp_ioctl */</i></b>
<a name=L120 href="source/kernel/chr_drv/lp.c?v=0.97#L120">120</a>         <a href="ident?v=0.97;i=lp_open">lp_open</a>,
<a name=L121 href="source/kernel/chr_drv/lp.c?v=0.97#L121">121</a>         <a href="ident?v=0.97;i=lp_release">lp_release</a>
<a name=L122 href="source/kernel/chr_drv/lp.c?v=0.97#L122">122</a> };
<a name=L123 href="source/kernel/chr_drv/lp.c?v=0.97#L123">123</a> 
<a name=L124 href="source/kernel/chr_drv/lp.c?v=0.97#L124">124</a> long <a href="ident?v=0.97;i=lp_init">lp_init</a>(long kmem_start)
<a name=L125 href="source/kernel/chr_drv/lp.c?v=0.97#L125">125</a> {
<a name=L126 href="source/kernel/chr_drv/lp.c?v=0.97#L126">126</a>         int offset = 0;
<a name=L127 href="source/kernel/chr_drv/lp.c?v=0.97#L127">127</a>         unsigned int testvalue = 0;
<a name=L128 href="source/kernel/chr_drv/lp.c?v=0.97#L128">128</a>         int <a href="ident?v=0.97;i=count">count</a> = 0;
<a name=L129 href="source/kernel/chr_drv/lp.c?v=0.97#L129">129</a> 
<a name=L130 href="source/kernel/chr_drv/lp.c?v=0.97#L130">130</a>         <a href="ident?v=0.97;i=chrdev_fops">chrdev_fops</a>[6] = &amp;<a href="ident?v=0.97;i=lp_fops">lp_fops</a>;
<a name=L131 href="source/kernel/chr_drv/lp.c?v=0.97#L131">131</a>         <b><i>/* take on all known port values */</i></b>
<a name=L132 href="source/kernel/chr_drv/lp.c?v=0.97#L132">132</a>         for (offset = 0; offset &lt; <a href="ident?v=0.97;i=LP_NO">LP_NO</a>; offset++) {
<a name=L133 href="source/kernel/chr_drv/lp.c?v=0.97#L133">133</a>                 <b><i>/* write to port &amp; read back to check */</i></b>
<a name=L134 href="source/kernel/chr_drv/lp.c?v=0.97#L134">134</a>                 <a href="ident?v=0.97;i=outb">outb</a>( <a href="ident?v=0.97;i=LP_DUMMY">LP_DUMMY</a>, <a href="ident?v=0.97;i=LP_B">LP_B</a>(offset));
<a name=L135 href="source/kernel/chr_drv/lp.c?v=0.97#L135">135</a>                 for (testvalue = 0 ; testvalue &lt; <a href="ident?v=0.97;i=LP_DELAY">LP_DELAY</a> ; testvalue++)
<a name=L136 href="source/kernel/chr_drv/lp.c?v=0.97#L136">136</a>                         ;
<a name=L137 href="source/kernel/chr_drv/lp.c?v=0.97#L137">137</a>                 testvalue = <a href="ident?v=0.97;i=inb">inb</a>(<a href="ident?v=0.97;i=LP_B">LP_B</a>(offset));
<a name=L138 href="source/kernel/chr_drv/lp.c?v=0.97#L138">138</a>                 if (testvalue != 255) {
<a name=L139 href="source/kernel/chr_drv/lp.c?v=0.97#L139">139</a>                         <a href="ident?v=0.97;i=LP_F">LP_F</a>(offset) |= <a href="ident?v=0.97;i=LP_EXIST">LP_EXIST</a>;
<a name=L140 href="source/kernel/chr_drv/lp.c?v=0.97#L140">140</a>                         <a href="ident?v=0.97;i=lp_reset">lp_reset</a>(offset);
<a name=L141 href="source/kernel/chr_drv/lp.c?v=0.97#L141">141</a>                         <a href="ident?v=0.97;i=printk">printk</a>(<i>"lp_init: lp%d exists (%d)\n"</i>, offset, testvalue);
<a name=L142 href="source/kernel/chr_drv/lp.c?v=0.97#L142">142</a>                         <a href="ident?v=0.97;i=count">count</a>++;
<a name=L143 href="source/kernel/chr_drv/lp.c?v=0.97#L143">143</a>                 }
<a name=L144 href="source/kernel/chr_drv/lp.c?v=0.97#L144">144</a>         }
<a name=L145 href="source/kernel/chr_drv/lp.c?v=0.97#L145">145</a>         if (<a href="ident?v=0.97;i=count">count</a> == 0)
<a name=L146 href="source/kernel/chr_drv/lp.c?v=0.97#L146">146</a>                 <a href="ident?v=0.97;i=printk">printk</a>(<i>"lp_init: no lp devices found\n"</i>);
<a name=L147 href="source/kernel/chr_drv/lp.c?v=0.97#L147">147</a>         return kmem_start;
<a name=L148 href="source/kernel/chr_drv/lp.c?v=0.97#L148">148</a> }
<a name=L149 href="source/kernel/chr_drv/lp.c?v=0.97#L149">149</a> </pre><hr>
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