From 782a7a632e4b0581ade665e3d89ee97c8db0f441 Mon Sep 17 00:00:00 2001
From: Greg Kroah-Hartman <gregkh@suse.de>
Date: Fri, 19 May 2006 13:20:20 -0700
Subject: [PATCH] [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>
---
drivers/usb/core/message.c | 31 +++++++++++++++++++++++++++++++
include/linux/usb.h | 2 ++
2 files changed, 33 insertions(+)
diff --git a/drivers/usb/core/message.c b/drivers/usb/core/message.c
index 08fb20f06f3e98..b2f608b0538df5 100644
--- a/drivers/usb/core/message.c
+++ b/drivers/usb/core/message.c
@@ -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
diff --git a/include/linux/usb.h b/include/linux/usb.h
index 1f492c0c704743..317ec9f28bcebb 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);
--
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