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[PATCH] USB: add usb_interrupt_msg() function for api completeness. 

Really just a wrapper around usb_bulk_msg() but now it's documented
much better.

Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Greg Kroah-Hartman 2006-05-19 13:20:20 -07:00
parent caa2a12267
commit 782a7a632e
2 changed files with 33 additions and 0 deletions
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31
drivers/usb/core/message.c
View File

@ -157,6 +157,37 @@ int usb_control_msg(struct usb_device *dev, unsigned int pipe, __u8 request, __u
}
/**
* usb_interrupt_msg - Builds an interrupt urb, sends it off and waits for completion
* @usb_dev: pointer to the usb device to send the message to
* @pipe: endpoint "pipe" to send the message to
* @data: pointer to the data to send
* @len: length in bytes of the data to send
* @actual_length: pointer to a location to put the actual length transferred in bytes
* @timeout: time in msecs to wait for the message to complete before
* timing out (if 0 the wait is forever)
* Context: !in_interrupt ()
*
* This function sends a simple interrupt message to a specified endpoint and
* waits for the message to complete, or timeout.
*
* If successful, it returns 0, otherwise a negative error number. The number
* of actual bytes transferred will be stored in the actual_length paramater.
*
* Don't use this function from within an interrupt context, like a bottom half
* handler. If you need an asynchronous message, or need to send a message
* from within interrupt context, use usb_submit_urb() If a thread in your
* driver uses this call, make sure your disconnect() method can wait for it to
* complete. Since you don't have a handle on the URB used, you can't cancel
* the request.
*/
int usb_interrupt_msg(struct usb_device *usb_dev, unsigned int pipe,
void *data, int len, int *actual_length, int timeout)
{
return usb_bulk_msg(usb_dev, pipe, data, len, actual_length, timeout);
}
EXPORT_SYMBOL_GPL(usb_interrupt_msg);
/**
* usb_bulk_msg - Builds a bulk urb, sends it off and waits for completion
* @usb_dev: pointer to the usb device to send the message to

2
include/linux/usb.h
View File

@ -1008,6 +1008,8 @@ void usb_buffer_unmap_sg (struct usb_device *dev, unsigned pipe,
extern int usb_control_msg(struct usb_device *dev, unsigned int pipe,
__u8 request, __u8 requesttype, __u16 value, __u16 index,
void *data, __u16 size, int timeout);
extern int usb_interrupt_msg(struct usb_device *usb_dev, unsigned int pipe,
void *data, int len, int *actual_length, int timeout);
extern int usb_bulk_msg(struct usb_device *usb_dev, unsigned int pipe,
void *data, int len, int *actual_length,
int timeout);