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authorRobert P. J. Day <rpjday@crashcourse.ca>2008-04-21 18:57:50 -0400
committerJesper Juhl <juhl@hera.kernel.org>2008-04-21 18:57:50 -0400
commit838cb6aba4cebcf4fcd06b90e2adf890bef884ac (patch)
tree30f485426309483487ad821fa9980c61564e7cbe /Documentation/DocBook/writing_usb_driver.tmpl
parent37679011c5a674eb80bff5c2b9b067bf16011d46 (diff)
DOC: A couple corrections and clarifications in USB doc.
A couple of corrections and clarifications in USB documentation. Signed-off-by: Robert P. J. Day <rpjday@crashcourse.ca> Signed-off-by: Jesper Juhl <jesper.juhl@gmail.com>
Diffstat (limited to 'Documentation/DocBook/writing_usb_driver.tmpl')
-rw-r--r--Documentation/DocBook/writing_usb_driver.tmpl14
1 files changed, 7 insertions, 7 deletions
diff --git a/Documentation/DocBook/writing_usb_driver.tmpl b/Documentation/DocBook/writing_usb_driver.tmpl
index d4188d4ff535..eeff19ca831b 100644
--- a/Documentation/DocBook/writing_usb_driver.tmpl
+++ b/Documentation/DocBook/writing_usb_driver.tmpl
@@ -100,8 +100,8 @@
100 useful documents, at the USB home page (see Resources). An excellent 100 useful documents, at the USB home page (see Resources). An excellent
101 introduction to the Linux USB subsystem can be found at the USB Working 101 introduction to the Linux USB subsystem can be found at the USB Working
102 Devices List (see Resources). It explains how the Linux USB subsystem is 102 Devices List (see Resources). It explains how the Linux USB subsystem is
103 structured and introduces the reader to the concept of USB urbs, which 103 structured and introduces the reader to the concept of USB urbs
104 are essential to USB drivers. 104 (USB Request Blocks), which are essential to USB drivers.
105 </para> 105 </para>
106 <para> 106 <para>
107 The first thing a Linux USB driver needs to do is register itself with 107 The first thing a Linux USB driver needs to do is register itself with
@@ -162,8 +162,8 @@ static int __init usb_skel_init(void)
162module_init(usb_skel_init); 162module_init(usb_skel_init);
163 </programlisting> 163 </programlisting>
164 <para> 164 <para>
165 When the driver is unloaded from the system, it needs to unregister 165 When the driver is unloaded from the system, it needs to deregister
166 itself with the USB subsystem. This is done with the usb_unregister 166 itself with the USB subsystem. This is done with the usb_deregister
167 function: 167 function:
168 </para> 168 </para>
169 <programlisting> 169 <programlisting>
@@ -232,7 +232,7 @@ static int skel_probe(struct usb_interface *interface,
232 were passed to the USB subsystem will be called from a user program trying 232 were passed to the USB subsystem will be called from a user program trying
233 to talk to the device. The first function called will be open, as the 233 to talk to the device. The first function called will be open, as the
234 program tries to open the device for I/O. We increment our private usage 234 program tries to open the device for I/O. We increment our private usage
235 count and save off a pointer to our internal structure in the file 235 count and save a pointer to our internal structure in the file
236 structure. This is done so that future calls to file operations will 236 structure. This is done so that future calls to file operations will
237 enable the driver to determine which device the user is addressing. All 237 enable the driver to determine which device the user is addressing. All
238 of this is done with the following code: 238 of this is done with the following code:
@@ -252,8 +252,8 @@ file->private_data = dev;
252 send to the device based on the size of the write urb it has created (this 252 send to the device based on the size of the write urb it has created (this
253 size depends on the size of the bulk out end point that the device has). 253 size depends on the size of the bulk out end point that the device has).
254 Then it copies the data from user space to kernel space, points the urb to 254 Then it copies the data from user space to kernel space, points the urb to
255 the data and submits the urb to the USB subsystem. This can be shown in 255 the data and submits the urb to the USB subsystem. This can be seen in
256 he following code: 256 the following code:
257 </para> 257 </para>
258 <programlisting> 258 <programlisting>
259/* we can only write as much as 1 urb will hold */ 259/* we can only write as much as 1 urb will hold */