}
EXPORT_SYMBOL_GPL(usb_control_msg);
+/**
+ * usb_control_msg_send - Builds a control "send" message, sends it off and waits for completion
+ * @dev: pointer to the usb device to send the message to
+ * @endpoint: endpoint to send the message to
+ * @request: USB message request value
+ * @requesttype: USB message request type value
+ * @value: USB message value
+ * @index: USB message index value
+ * @driver_data: pointer to the data to send
+ * @size: length in bytes of the data to send
+ * @timeout: time in msecs to wait for the message to complete before timing
+ * out (if 0 the wait is forever)
+ * @memflags: the flags for memory allocation for buffers
+ *
+ * Context: !in_interrupt ()
+ *
+ * This function sends a control message to a specified endpoint that is not
+ * expected to fill in a response (i.e. a "send message") and waits for the
+ * message to complete, or timeout.
+ *
+ * Do not use this function from within an interrupt context. 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.
+ *
+ * The data pointer can be made to a reference on the stack, or anywhere else,
+ * as it will not be modified at all. This does not have the restriction that
+ * usb_control_msg() has where the data pointer must be to dynamically allocated
+ * memory (i.e. memory that can be successfully DMAed to a device).
+ *
+ * Return: If successful, 0 is returned, Otherwise, a negative error number.
+ */
+int usb_control_msg_send(struct usb_device *dev, __u8 endpoint, __u8 request,
+ __u8 requesttype, __u16 value, __u16 index,
+ const void *driver_data, __u16 size, int timeout,
+ gfp_t memflags)
+{
+ unsigned int pipe = usb_sndctrlpipe(dev, endpoint);
+ int ret;
+ u8 *data = NULL;
+
+ if (usb_pipe_type_check(dev, pipe))
+ return -EINVAL;
+
+ if (size) {
+ data = kmemdup(driver_data, size, memflags);
+ if (!data)
+ return -ENOMEM;
+ }
+
+ ret = usb_control_msg(dev, pipe, request, requesttype, value, index,
+ data, size, timeout);
+ kfree(data);
+
+ if (ret < 0)
+ return ret;
+ if (ret == size)
+ return 0;
+ return -EINVAL;
+}
+EXPORT_SYMBOL_GPL(usb_control_msg_send);
+
+/**
+ * usb_control_msg_recv - Builds a control "receive" message, sends it off and waits for completion
+ * @dev: pointer to the usb device to send the message to
+ * @endpoint: endpoint to send the message to
+ * @request: USB message request value
+ * @requesttype: USB message request type value
+ * @value: USB message value
+ * @index: USB message index value
+ * @driver_data: pointer to the data to be filled in by the message
+ * @size: length in bytes of the data to be received
+ * @timeout: time in msecs to wait for the message to complete before timing
+ * out (if 0 the wait is forever)
+ * @memflags: the flags for memory allocation for buffers
+ *
+ * Context: !in_interrupt ()
+ *
+ * This function sends a control message to a specified endpoint that is
+ * expected to fill in a response (i.e. a "receive message") and waits for the
+ * message to complete, or timeout.
+ *
+ * Do not use this function from within an interrupt context. 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.
+ *
+ * The data pointer can be made to a reference on the stack, or anywhere else
+ * that can be successfully written to. This function does not have the
+ * restriction that usb_control_msg() has where the data pointer must be to
+ * dynamically allocated memory (i.e. memory that can be successfully DMAed to a
+ * device).
+ *
+ * The "whole" message must be properly received from the device in order for
+ * this function to be successful. If a device returns less than the expected
+ * amount of data, then the function will fail. Do not use this for messages
+ * where a variable amount of data might be returned.
+ *
+ * Return: If successful, 0 is returned, Otherwise, a negative error number.
+ */
+int usb_control_msg_recv(struct usb_device *dev, __u8 endpoint, __u8 request,
+ __u8 requesttype, __u16 value, __u16 index,
+ void *driver_data, __u16 size, int timeout,
+ gfp_t memflags)
+{
+ unsigned int pipe = usb_rcvctrlpipe(dev, endpoint);
+ int ret;
+ u8 *data;
+
+ if (!size || !driver_data || usb_pipe_type_check(dev, pipe))
+ return -EINVAL;
+
+ data = kmalloc(size, memflags);
+ if (!data)
+ return -ENOMEM;
+
+ ret = usb_control_msg(dev, pipe, request, requesttype, value, index,
+ data, size, timeout);
+
+ if (ret < 0)
+ goto exit;
+
+ if (ret == size) {
+ memcpy(driver_data, data, size);
+ ret = 0;
+ } else {
+ ret = -EINVAL;
+ }
+
+exit:
+ kfree(data);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(usb_control_msg_recv);
+
/**
* 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
if (dev->speed < USB_SPEED_SUPER)
return 0;
- return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
+ return usb_control_msg_send(dev, 0,
USB_REQ_SET_ISOCH_DELAY,
USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_DEVICE,
dev->hub_delay, 0, NULL, 0,
- USB_CTRL_SET_TIMEOUT);
+ USB_CTRL_SET_TIMEOUT,
+ GFP_NOIO);
}
/**
* (like some ibmcam model 1 units) seem to expect hosts to make
* this request for iso endpoints, which can't halt!
*/
- result = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
- USB_REQ_CLEAR_FEATURE, USB_RECIP_ENDPOINT,
- USB_ENDPOINT_HALT, endp, NULL, 0,
- USB_CTRL_SET_TIMEOUT);
+ result = usb_control_msg_send(dev, 0,
+ USB_REQ_CLEAR_FEATURE, USB_RECIP_ENDPOINT,
+ USB_ENDPOINT_HALT, endp, NULL, 0,
+ USB_CTRL_SET_TIMEOUT, GFP_NOIO);
/* don't un-halt or force to DATA0 except on success */
- if (result < 0)
+ if (result)
return result;
/* NOTE: seems like Microsoft and Apple don't bother verifying
if (dev->quirks & USB_QUIRK_NO_SET_INTF)
ret = -EPIPE;
else
- ret = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
- USB_REQ_SET_INTERFACE, USB_RECIP_INTERFACE,
- alternate, interface, NULL, 0, 5000);
+ ret = usb_control_msg_send(dev, 0,
+ USB_REQ_SET_INTERFACE,
+ USB_RECIP_INTERFACE, alternate,
+ interface, NULL, 0, 5000,
+ GFP_NOIO);
/* 9.4.10 says devices don't need this and are free to STALL the
* request if the interface only has one alternate setting.
"manual set_interface for iface %d, alt %d\n",
interface, alternate);
manual = 1;
- } else if (ret < 0) {
+ } else if (ret) {
/* Re-instate the old alt setting */
usb_hcd_alloc_bandwidth(dev, NULL, alt, iface->cur_altsetting);
usb_enable_lpm(dev);
mutex_unlock(hcd->bandwidth_mutex);
return retval;
}
- retval = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
- USB_REQ_SET_CONFIGURATION, 0,
- config->desc.bConfigurationValue, 0,
- NULL, 0, USB_CTRL_SET_TIMEOUT);
- if (retval < 0) {
+ retval = usb_control_msg_send(dev, 0, USB_REQ_SET_CONFIGURATION, 0,
+ config->desc.bConfigurationValue, 0,
+ NULL, 0, USB_CTRL_SET_TIMEOUT,
+ GFP_NOIO);
+ if (retval) {
usb_hcd_alloc_bandwidth(dev, NULL, NULL, NULL);
usb_enable_lpm(dev);
mutex_unlock(hcd->bandwidth_mutex);
}
kfree(new_interfaces);
- ret = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
- USB_REQ_SET_CONFIGURATION, 0, configuration, 0,
- NULL, 0, USB_CTRL_SET_TIMEOUT);
- if (ret < 0 && cp) {
+ ret = usb_control_msg_send(dev, 0, USB_REQ_SET_CONFIGURATION, 0,
+ configuration, 0, NULL, 0,
+ USB_CTRL_SET_TIMEOUT, GFP_NOIO);
+ if (ret && cp) {
/*
* All the old state is gone, so what else can we do?
* The device is probably useless now anyway.
projects / J-linux.git / blobdiff