diff options
| -rw-r--r-- | drivers/usb/core/message.c | 31 | ||||
| -rw-r--r-- | include/linux/usb.h | 2 |
2 files changed, 33 insertions, 0 deletions
diff --git a/drivers/usb/core/message.c b/drivers/usb/core/message.c index 08fb20f06f3..b2f608b0538 100644 --- a/drivers/usb/core/message.c +++ b/drivers/usb/core/message.c @@ -158,6 +158,37 @@ 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 * @pipe: endpoint "pipe" to send the message to diff --git a/include/linux/usb.h b/include/linux/usb.h index 1f492c0c704..317ec9f28bc 100644 --- a/include/linux/usb.h +++ b/include/linux/usb.h @@ -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); |