simple cdev.mht

字符驱动开发详细介绍

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            align=3Dleft><SPAN lang=3DEN-US=20
            style=3D"FONT-SIZE: 9pt; LETTER-SPACING: 1pt">struct cdev=20
            *cdev_alloc(void);<o:p></o:p></SPAN></P>
            <P class=3DMsoNormal=20
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            align=3Dleft><SPAN lang=3DEN-US=20
            style=3D"FONT-SIZE: 9pt; LETTER-SPACING: 1pt">void =
cdev_put(struct=20
            cdev *p);<o:p></o:p></SPAN></P>
            <P class=3DMsoNormal=20
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            align=3Dleft><SPAN lang=3DEN-US=20
            style=3D"FONT-SIZE: 9pt; LETTER-SPACING: 1pt">int =
cdev_add(struct cdev=20
            *, dev_t, unsigned);<o:p></o:p></SPAN></P>
            <P class=3DMsoNormal=20
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            align=3Dleft><SPAN lang=3DEN-US=20
            style=3D"FONT-SIZE: 9pt; LETTER-SPACING: 1pt">void =
cdev_del(struct=20
            cdev *);<o:p></o:p></SPAN></P>
            <P class=3DMsoNormal=20
            style=3D"MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt"><FONT =
size=3D3><SPAN=20
            lang=3DEN-US>cdev_init()</SPAN><SPAN=20
            style=3D"FONT-FAMILY: =CB=CE=CC=E5; mso-ascii-font-family: =
'Times New Roman'; mso-hansi-font-family: 'Times New =
Roman'">=BA=AF=CA=FD=D3=C3=D3=DA=B3=F5=CA=BC=BB=AF</SPAN><SPAN=20
            lang=3DEN-US>cdev</SPAN><SPAN=20
            style=3D"FONT-FAMILY: =CB=CE=CC=E5; mso-ascii-font-family: =
'Times New Roman'; mso-hansi-font-family: 'Times New =
Roman'">=B5=C4=B3=C9=D4=B1=A3=AC=B2=A2=BD=A8=C1=A2</SPAN><SPAN=20
            lang=3DEN-US>cdev</SPAN><SPAN=20
            style=3D"FONT-FAMILY: =CB=CE=CC=E5; mso-ascii-font-family: =
'Times New Roman'; mso-hansi-font-family: 'Times New =
Roman'">=BA=CD</SPAN><SPAN=20
            lang=3DEN-US>file_operations</SPAN><SPAN=20
            style=3D"FONT-FAMILY: =CB=CE=CC=E5; mso-ascii-font-family: =
'Times New Roman'; mso-hansi-font-family: 'Times New =
Roman'">=D6=AE=BC=E4=B5=C4=C1=AC=BD=D3=A3=AC=C6=E4=D4=B4=B4=FA=C2=EB=C8=E7=
=C7=E5=B5=A5</SPAN><SPAN=20
            lang=3DEN-US>6-2</SPAN><SPAN=20
            style=3D"FONT-FAMILY: =CB=CE=CC=E5; mso-ascii-font-family: =
'Times New Roman'; mso-hansi-font-family: 'Times New =
Roman'">=A1=A3</SPAN></FONT></P>
            <P class=3DMsoNormal=20
            style=3D"MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt"><FONT =
size=3D3><B=20
            style=3D"mso-bidi-font-weight: normal"><SPAN=20
            style=3D"FONT-FAMILY: =CB=CE=CC=E5; mso-ascii-font-family: =
'Times New Roman'; mso-hansi-font-family: 'Times New =
Roman'">=B4=FA=C2=EB=C7=E5=B5=A5</SPAN><SPAN=20
            lang=3DEN-US>6.2 cdev_init()</SPAN></B><B=20
            style=3D"mso-bidi-font-weight: normal"><SPAN=20
            style=3D"FONT-FAMILY: =CB=CE=CC=E5; mso-ascii-font-family: =
'Times New Roman'; mso-hansi-font-family: 'Times New =
Roman'">=BA=AF=CA=FD</SPAN></B><B=20
            style=3D"mso-bidi-font-weight: normal"><SPAN lang=3DEN-US=20
            style=3D"FONT-SIZE: 9pt; LETTER-SPACING: =
1pt"><o:p></o:p></SPAN></B></FONT></P>
            <P class=3DMsoNormal=20
            style=3D"BACKGROUND: silver; MARGIN: 0cm 0cm 0pt; =
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            align=3Dleft><SPAN lang=3DEN-US=20
            style=3D"FONT-SIZE: 9pt; LETTER-SPACING: 1pt">1<SPAN=20
            style=3D"mso-spacerun: yes">&nbsp; </SPAN>void =
cdev_init(struct cdev=20
            *cdev, struct file_operations *fops)<o:p></o:p></SPAN></P>
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            align=3Dleft><SPAN lang=3DEN-US=20
            style=3D"FONT-SIZE: 9pt; LETTER-SPACING: 1pt">2<SPAN=20
            style=3D"mso-spacerun: yes">&nbsp; =
</SPAN>{<o:p></o:p></SPAN></P>
            <P class=3DMsoNormal=20
            style=3D"BACKGROUND: silver; MARGIN: 0cm 0cm 0pt; =
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            align=3Dleft><SPAN lang=3DEN-US=20
            style=3D"FONT-SIZE: 9pt; LETTER-SPACING: 1pt">3<SPAN=20
            style=3D"mso-spacerun: yes">&nbsp; </SPAN><SPAN=20
            style=3D"mso-tab-count: 1"></SPAN>memset(cdev, 0, sizeof=20
            *cdev);<o:p></o:p></SPAN></P>
            <P class=3DMsoNormal=20
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            align=3Dleft><SPAN lang=3DEN-US=20
            style=3D"FONT-SIZE: 9pt; LETTER-SPACING: 1pt">4<SPAN=20
            style=3D"mso-spacerun: yes">&nbsp; </SPAN><SPAN=20
            style=3D"mso-tab-count: =
1"></SPAN>INIT_LIST_HEAD(&amp;cdev-&gt;list);<o:p></o:p></SPAN></P>
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            align=3Dleft><SPAN lang=3DEN-US=20
            style=3D"FONT-SIZE: 9pt; LETTER-SPACING: 1pt">5<SPAN=20
            style=3D"mso-spacerun: yes">&nbsp; </SPAN><SPAN=20
            style=3D"mso-tab-count: 1"></SPAN>cdev-&gt;kobj.ktype =3D=20
            &amp;ktype_cdev_default;<o:p></o:p></SPAN></P>
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            align=3Dleft><SPAN lang=3DEN-US=20
            style=3D"FONT-SIZE: 9pt; LETTER-SPACING: 1pt">6<SPAN=20
            style=3D"mso-spacerun: yes">&nbsp; </SPAN><SPAN=20
            style=3D"mso-tab-count: =
1"></SPAN>kobject_init(&amp;cdev-&gt;kobj);<o:p></o:p></SPAN></P>
            <P class=3DMsoNormal=20
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            align=3Dleft><SPAN lang=3DEN-US=20
            style=3D"FONT-SIZE: 9pt; LETTER-SPACING: 1pt">7<SPAN=20
            style=3D"mso-spacerun: yes">&nbsp; </SPAN><SPAN=20
            style=3D"mso-tab-count: 1"></SPAN>cdev-&gt;ops =3D =
fops;<SPAN=20
            style=3D"mso-spacerun: yes">&nbsp;&nbsp;&nbsp; =
</SPAN>/*</SPAN><SPAN=20
            style=3D"FONT-SIZE: 9pt; FONT-FAMILY: =CB=CE=CC=E5; =
LETTER-SPACING: 1pt; mso-ascii-font-family: 'Times New Roman'; =
mso-hansi-font-family: 'Times New =
Roman'">=BD=AB=B4=AB=C8=EB=B5=C4=CE=C4=BC=FE=B2=D9=D7=F7=BD=E1=B9=B9=CC=E5=
=D6=B8=D5=EB=B8=B3=D6=B5=B8=F8</SPAN><SPAN=20
            lang=3DEN-US=20
            style=3D"FONT-SIZE: 9pt; LETTER-SPACING: =
1pt">cdev</SPAN><SPAN=20
            style=3D"FONT-SIZE: 9pt; FONT-FAMILY: =CB=CE=CC=E5; =
LETTER-SPACING: 1pt; mso-ascii-font-family: 'Times New Roman'; =
mso-hansi-font-family: 'Times New Roman'">=B5=C4</SPAN><SPAN=20
            lang=3DEN-US=20
            style=3D"FONT-SIZE: 9pt; LETTER-SPACING: =
1pt">ops*/<o:p></o:p></SPAN></P>
            <P class=3DMsoNormal=20
            style=3D"BACKGROUND: silver; MARGIN: 0cm 0cm 0pt; =
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            align=3Dleft><SPAN lang=3DEN-US=20
            style=3D"FONT-SIZE: 9pt; LETTER-SPACING: 1pt">8<SPAN=20
            style=3D"mso-spacerun: yes">&nbsp; =
</SPAN>}<o:p></o:p></SPAN></P>
            <P class=3DMsoNormal=20
            style=3D"MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt"><FONT =
size=3D3><SPAN=20
            lang=3DEN-US>cdev_alloc()</SPAN><SPAN=20
            style=3D"FONT-FAMILY: =CB=CE=CC=E5; mso-ascii-font-family: =
'Times New Roman'; mso-hansi-font-family: 'Times New =
Roman'">=BA=AF=CA=FD=D3=C3=D3=DA=B6=AF=CC=AC=C9=EA=C7=EB=D2=BB=B8=F6</SPA=
N><SPAN=20
            lang=3DEN-US>cdev</SPAN><SPAN=20
            style=3D"FONT-FAMILY: =CB=CE=CC=E5; mso-ascii-font-family: =
'Times New Roman'; mso-hansi-font-family: 'Times New =
Roman'">=C4=DA=B4=E6=A3=AC=C6=E4=D4=B4=B4=FA=C2=EB=C8=E7=C7=E5=B5=A5</SPA=
N><SPAN=20
            lang=3DEN-US>6-3</SPAN><SPAN=20
            style=3D"FONT-FAMILY: =CB=CE=CC=E5; mso-ascii-font-family: =
'Times New Roman'; mso-hansi-font-family: 'Times New =
Roman'">=A1=A3</SPAN></FONT></P>
            <P class=3DMsoNormal=20
            style=3D"MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt"><FONT =
size=3D3><B=20
            style=3D"mso-bidi-font-weight: normal"><SPAN=20
            style=3D"FONT-FAMILY: =CB=CE=CC=E5; mso-ascii-font-family: =
'Times New Roman'; mso-hansi-font-family: 'Times New =
Roman'">=B4=FA=C2=EB=C7=E5=B5=A5</SPAN><SPAN=20
            lang=3DEN-US>6.3 cdev_alloc()</SPAN></B><B=20
            style=3D"mso-bidi-font-weight: normal"><SPAN=20
            style=3D"FONT-FAMILY: =CB=CE=CC=E5; mso-ascii-font-family: =
'Times New Roman'; mso-hansi-font-family: 'Times New =
Roman'">=BA=AF=CA=FD</SPAN><SPAN=20
            lang=3DEN-US><o:p></o:p></SPAN></B></FONT></P>
            <P class=3DMsoNormal=20
            style=3D"BACKGROUND: silver; MARGIN: 0cm 0cm 0pt; =
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            align=3Dleft><SPAN lang=3DEN-US=20
            style=3D"FONT-SIZE: 9pt; LETTER-SPACING: 1pt">1<SPAN=20
            style=3D"mso-spacerun: yes">&nbsp; </SPAN>struct cdev=20
            *cdev_alloc(void)<o:p></o:p></SPAN></P>
            <P class=3DMsoNormal=20
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            align=3Dleft><SPAN lang=3DEN-US=20
            style=3D"FONT-SIZE: 9pt; LETTER-SPACING: 1pt">2<SPAN=20
            style=3D"mso-spacerun: yes">&nbsp; =
</SPAN>{<o:p></o:p></SPAN></P>
            <P class=3DMsoNormal=20
            style=3D"BACKGROUND: silver; MARGIN: 0cm 0cm 0pt; =
TEXT-INDENT: 21pt; LINE-HEIGHT: 11pt; TEXT-ALIGN: left; mso-pagination: =
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            align=3Dleft><SPAN lang=3DEN-US=20
            style=3D"FONT-SIZE: 9pt; LETTER-SPACING: 1pt">3<SPAN=20
            style=3D"mso-spacerun: yes">&nbsp; </SPAN><SPAN=20
            style=3D"mso-tab-count: 1"></SPAN>struct cdev =
*p=3Dkmalloc(sizeof(struct=20
            cdev),GFP_KERNEL); /*</SPAN><SPAN=20
            style=3D"FONT-SIZE: 9pt; FONT-FAMILY: =CB=CE=CC=E5; =
LETTER-SPACING: 1pt; mso-ascii-font-family: 'Times New Roman'; =
mso-hansi-font-family: 'Times New Roman'">=B7=D6=C5=E4</SPAN><SPAN=20
            lang=3DEN-US=20
            style=3D"FONT-SIZE: 9pt; LETTER-SPACING: =
1pt">cdev</SPAN><SPAN=20
            style=3D"FONT-SIZE: 9pt; FONT-FAMILY: =CB=CE=CC=E5; =
LETTER-SPACING: 1pt; mso-ascii-font-family: 'Times New Roman'; =
mso-hansi-font-family: 'Times New Roman'">=B5=C4=C4=DA=B4=E6</SPAN><SPAN =

            lang=3DEN-US=20
            style=3D"FONT-SIZE: 9pt; LETTER-SPACING: =
1pt">*/<o:p></o:p></SPAN></P>
            <P class=3DMsoNormal=20
            style=3D"BACKGROUND: silver; MARGIN: 0cm 0cm 0pt; =
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            align=3Dleft><SPAN lang=3DEN-US=20
            style=3D"FONT-SIZE: 9pt; LETTER-SPACING: 1pt">4<SPAN=20
            style=3D"mso-spacerun: yes">&nbsp; </SPAN><SPAN=20
            style=3D"mso-tab-count: 1"></SPAN>if (p) =
{<o:p></o:p></SPAN></P>
            <P class=3DMsoNormal=20
            style=3D"BACKGROUND: silver; MARGIN: 0cm 0cm 0pt; =
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            align=3Dleft><SPAN lang=3DEN-US=20
            style=3D"FONT-SIZE: 9pt; LETTER-SPACING: 1pt">5<SPAN=20
            style=3D"mso-spacerun: yes">&nbsp; </SPAN><SPAN=20
            style=3D"mso-tab-count: =
2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=20
            </SPAN>memset(p, 0, sizeof(struct =
cdev));<o:p></o:p></SPAN></P>
            <P class=3DMsoNormal=20
            style=3D"BACKGROUND: silver; MARGIN: 0cm 0cm 0pt; =
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            align=3Dleft><SPAN lang=3DEN-US=20
            style=3D"FONT-SIZE: 9pt; LETTER-SPACING: 1pt">6<SPAN=20
            style=3D"mso-spacerun: yes">&nbsp; </SPAN><SPAN=20
            style=3D"mso-tab-count: =
2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=20
            </SPAN>p-&gt;kobj.ktype =3D=20
            &amp;ktype_cdev_dynamic;<o:p></o:p></SPAN></P>
            <P class=3DMsoNormal=20
            style=3D"BACKGROUND: silver; MARGIN: 0cm 0cm 0pt; =
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            align=3Dleft><SPAN lang=3DEN-US=20
            style=3D"FONT-SIZE: 9pt; LETTER-SPACING: 1pt">7<SPAN=20