#include "hcd.h" /* for usbcore internals */
#include "usb.h"
-static void usb_api_blocking_completion(struct urb *urb, struct pt_regs *regs)
+static void usb_api_blocking_completion(struct urb *urb)
{
complete((struct completion *)urb->context);
}
io->dev = NULL;
}
-static void sg_complete (struct urb *urb, struct pt_regs *regs)
+static void sg_complete (struct urb *urb)
{
- struct usb_sg_request *io = (struct usb_sg_request *) urb->context;
+ struct usb_sg_request *io = urb->context;
spin_lock (&io->lock);
int retval;
io->urbs [i]->dev = io->dev;
- retval = usb_submit_urb (io->urbs [i], SLAB_ATOMIC);
+ retval = usb_submit_urb (io->urbs [i], GFP_ATOMIC);
/* after we submit, let completions or cancelations fire;
* we handshake using io->status.
err = -EINVAL;
goto errout;
} else {
- dev->have_langid = -1;
+ dev->have_langid = 1;
dev->string_langid = tbuf[2] | (tbuf[3]<< 8);
/* always use the first langid listed */
dev_dbg (&dev->dev, "default language 0x%04x\n",
* Context: !in_interrupt ()
*
* Updates the copy of the device descriptor stored in the device structure,
- * which dedicates space for this purpose. Note that several fields are
- * converted to the host CPU's byte order: the USB version (bcdUSB), and
- * vendors product and version fields (idVendor, idProduct, and bcdDevice).
- * That lets device drivers compare against non-byteswapped constants.
+ * which dedicates space for this purpose.
*
* Not exported, only for use by the core. If drivers really want to read
* the device descriptor directly, they can call usb_get_descriptor() with
ep = dev->ep_in[epnum];
dev->ep_in[epnum] = NULL;
}
- if (ep && dev->bus && dev->bus->op && dev->bus->op->disable)
- dev->bus->op->disable(dev, ep);
+ if (ep && dev->bus)
+ usb_hcd_endpoint_disable(dev, ep);
}
/**
if (cp && configuration == 0)
dev_warn(&dev->dev, "config 0 descriptor??\n");
- if (dev->state == USB_STATE_SUSPENDED)
- return -EHOSTUNREACH;
-
/* Allocate memory for new interfaces before doing anything else,
* so that if we run out then nothing will have changed. */
n = nintf = 0;
configuration, -i);
}
+ /* Wake up the device so we can send it the Set-Config request */
+ ret = usb_autoresume_device(dev);
+ if (ret)
+ goto free_interfaces;
+
/* if it's already configured, clear out old state first.
* getting rid of old interfaces means unbinding their drivers.
*/
dev->actconfig = cp;
if (!cp) {
usb_set_device_state(dev, USB_STATE_ADDRESS);
+ usb_autosuspend_device(dev);
goto free_interfaces;
}
usb_set_device_state(dev, USB_STATE_CONFIGURED);
usb_create_sysfs_intf_files (intf);
}
+ usb_autosuspend_device(dev);
+ return 0;
+}
+
+struct set_config_request {
+ struct usb_device *udev;
+ int config;
+ struct work_struct work;
+};
+
+/* Worker routine for usb_driver_set_configuration() */
+static void driver_set_config_work(struct work_struct *work)
+{
+ struct set_config_request *req =
+ container_of(work, struct set_config_request, work);
+
+ usb_lock_device(req->udev);
+ usb_set_configuration(req->udev, req->config);
+ usb_unlock_device(req->udev);
+ usb_put_dev(req->udev);
+ kfree(req);
+}
+
+/**
+ * usb_driver_set_configuration - Provide a way for drivers to change device configurations
+ * @udev: the device whose configuration is being updated
+ * @config: the configuration being chosen.
+ * Context: In process context, must be able to sleep
+ *
+ * Device interface drivers are not allowed to change device configurations.
+ * This is because changing configurations will destroy the interface the
+ * driver is bound to and create new ones; it would be like a floppy-disk
+ * driver telling the computer to replace the floppy-disk drive with a
+ * tape drive!
+ *
+ * Still, in certain specialized circumstances the need may arise. This
+ * routine gets around the normal restrictions by using a work thread to
+ * submit the change-config request.
+ *
+ * Returns 0 if the request was succesfully queued, error code otherwise.
+ * The caller has no way to know whether the queued request will eventually
+ * succeed.
+ */
+int usb_driver_set_configuration(struct usb_device *udev, int config)
+{
+ struct set_config_request *req;
+
+ req = kmalloc(sizeof(*req), GFP_KERNEL);
+ if (!req)
+ return -ENOMEM;
+ req->udev = udev;
+ req->config = config;
+ INIT_WORK(&req->work, driver_set_config_work);
+
+ usb_get_dev(udev);
+ if (!schedule_work(&req->work)) {
+ usb_put_dev(udev);
+ kfree(req);
+ return -EINVAL;
+ }
return 0;
}
+EXPORT_SYMBOL_GPL(usb_driver_set_configuration);
// synchronous request completion model
EXPORT_SYMBOL(usb_control_msg);