#include "hcd.h" /* for usbcore internals */
#include "usb.h"
+static void cancel_async_set_config(struct usb_device *udev);
+
struct api_context {
struct completion done;
int status;
dr->bRequestType = requesttype;
dr->bRequest = request;
- dr->wValue = cpu_to_le16p(&value);
- dr->wIndex = cpu_to_le16p(&index);
- dr->wLength = cpu_to_le16p(&size);
+ dr->wValue = cpu_to_le16(value);
+ dr->wIndex = cpu_to_le16(index);
+ dr->wLength = cpu_to_le16(size);
/* dbg("usb_control_msg"); */
}
EXPORT_SYMBOL_GPL(usb_clear_halt);
+static int create_intf_ep_devs(struct usb_interface *intf)
+{
+ struct usb_device *udev = interface_to_usbdev(intf);
+ struct usb_host_interface *alt = intf->cur_altsetting;
+ int i;
+
+ if (intf->ep_devs_created || intf->unregistering)
+ return 0;
+
+ for (i = 0; i < alt->desc.bNumEndpoints; ++i)
+ (void) usb_create_ep_devs(&intf->dev, &alt->endpoint[i], udev);
+ intf->ep_devs_created = 1;
+ return 0;
+}
+
+static void remove_intf_ep_devs(struct usb_interface *intf)
+{
+ struct usb_host_interface *alt = intf->cur_altsetting;
+ int i;
+
+ if (!intf->ep_devs_created)
+ return;
+
+ for (i = 0; i < alt->desc.bNumEndpoints; ++i)
+ usb_remove_ep_devs(&alt->endpoint[i]);
+ intf->ep_devs_created = 0;
+}
+
/**
* usb_disable_endpoint -- Disable an endpoint by address
* @dev: the device whose endpoint is being disabled
* @epaddr: the endpoint's address. Endpoint number for output,
* endpoint number + USB_DIR_IN for input
+ * @reset_hardware: flag to erase any endpoint state stored in the
+ * controller hardware
*
- * Deallocates hcd/hardware state for this endpoint ... and nukes all
- * pending urbs.
- *
- * If the HCD hasn't registered a disable() function, this sets the
- * endpoint's maxpacket size to 0 to prevent further submissions.
+ * Disables the endpoint for URB submission and nukes all pending URBs.
+ * If @reset_hardware is set then also deallocates hcd/hardware state
+ * for the endpoint.
*/
-void usb_disable_endpoint(struct usb_device *dev, unsigned int epaddr)
+void usb_disable_endpoint(struct usb_device *dev, unsigned int epaddr,
+ bool reset_hardware)
{
unsigned int epnum = epaddr & USB_ENDPOINT_NUMBER_MASK;
struct usb_host_endpoint *ep;
if (usb_endpoint_out(epaddr)) {
ep = dev->ep_out[epnum];
- dev->ep_out[epnum] = NULL;
+ if (reset_hardware)
+ dev->ep_out[epnum] = NULL;
} else {
ep = dev->ep_in[epnum];
- dev->ep_in[epnum] = NULL;
+ if (reset_hardware)
+ dev->ep_in[epnum] = NULL;
}
if (ep) {
ep->enabled = 0;
usb_hcd_flush_endpoint(dev, ep);
- usb_hcd_disable_endpoint(dev, ep);
+ if (reset_hardware)
+ usb_hcd_disable_endpoint(dev, ep);
}
}
* usb_disable_interface -- Disable all endpoints for an interface
* @dev: the device whose interface is being disabled
* @intf: pointer to the interface descriptor
+ * @reset_hardware: flag to erase any endpoint state stored in the
+ * controller hardware
*
* Disables all the endpoints for the interface's current altsetting.
*/
-void usb_disable_interface(struct usb_device *dev, struct usb_interface *intf)
+void usb_disable_interface(struct usb_device *dev, struct usb_interface *intf,
+ bool reset_hardware)
{
struct usb_host_interface *alt = intf->cur_altsetting;
int i;
for (i = 0; i < alt->desc.bNumEndpoints; ++i) {
usb_disable_endpoint(dev,
- alt->endpoint[i].desc.bEndpointAddress);
+ alt->endpoint[i].desc.bEndpointAddress,
+ reset_hardware);
}
}
dev_dbg(&dev->dev, "%s nuking %s URBs\n", __func__,
skip_ep0 ? "non-ep0" : "all");
for (i = skip_ep0; i < 16; ++i) {
- usb_disable_endpoint(dev, i);
- usb_disable_endpoint(dev, i + USB_DIR_IN);
+ usb_disable_endpoint(dev, i, true);
+ usb_disable_endpoint(dev, i + USB_DIR_IN, true);
}
dev->toggle[0] = dev->toggle[1] = 0;
dev_dbg(&dev->dev, "unregistering interface %s\n",
dev_name(&interface->dev));
interface->unregistering = 1;
- usb_remove_sysfs_intf_files(interface);
+ remove_intf_ep_devs(interface);
device_del(&interface->dev);
}
* usb_enable_endpoint - Enable an endpoint for USB communications
* @dev: the device whose interface is being enabled
* @ep: the endpoint
+ * @reset_toggle: flag to set the endpoint's toggle back to 0
*
- * Resets the endpoint toggle, and sets dev->ep_{in,out} pointers.
+ * Resets the endpoint toggle if asked, and sets dev->ep_{in,out} pointers.
* For control endpoints, both the input and output sides are handled.
*/
-void usb_enable_endpoint(struct usb_device *dev, struct usb_host_endpoint *ep)
+void usb_enable_endpoint(struct usb_device *dev, struct usb_host_endpoint *ep,
+ bool reset_toggle)
{
int epnum = usb_endpoint_num(&ep->desc);
int is_out = usb_endpoint_dir_out(&ep->desc);
int is_control = usb_endpoint_xfer_control(&ep->desc);
if (is_out || is_control) {
- usb_settoggle(dev, epnum, 1, 0);
+ if (reset_toggle)
+ usb_settoggle(dev, epnum, 1, 0);
dev->ep_out[epnum] = ep;
}
if (!is_out || is_control) {
- usb_settoggle(dev, epnum, 0, 0);
+ if (reset_toggle)
+ usb_settoggle(dev, epnum, 0, 0);
dev->ep_in[epnum] = ep;
}
ep->enabled = 1;
* usb_enable_interface - Enable all the endpoints for an interface
* @dev: the device whose interface is being enabled
* @intf: pointer to the interface descriptor
+ * @reset_toggles: flag to set the endpoints' toggles back to 0
*
* Enables all the endpoints for the interface's current altsetting.
*/
-static void usb_enable_interface(struct usb_device *dev,
- struct usb_interface *intf)
+void usb_enable_interface(struct usb_device *dev,
+ struct usb_interface *intf, bool reset_toggles)
{
struct usb_host_interface *alt = intf->cur_altsetting;
int i;
for (i = 0; i < alt->desc.bNumEndpoints; ++i)
- usb_enable_endpoint(dev, &alt->endpoint[i]);
+ usb_enable_endpoint(dev, &alt->endpoint[i], reset_toggles);
}
/**
*/
/* prevent submissions using previous endpoint settings */
- if (iface->cur_altsetting != alt)
+ if (iface->cur_altsetting != alt) {
+ remove_intf_ep_devs(iface);
usb_remove_sysfs_intf_files(iface);
- usb_disable_interface(dev, iface);
+ }
+ usb_disable_interface(dev, iface, true);
iface->cur_altsetting = alt;
* during the SETUP stage - hence EP0 toggles are "don't care" here.
* (Likewise, EP0 never "halts" on well designed devices.)
*/
- usb_enable_interface(dev, iface);
- if (device_is_registered(&iface->dev))
+ usb_enable_interface(dev, iface, true);
+ if (device_is_registered(&iface->dev)) {
usb_create_sysfs_intf_files(iface);
-
+ create_intf_ep_devs(iface);
+ }
return 0;
}
EXPORT_SYMBOL_GPL(usb_set_interface);
*/
for (i = 1; i < 16; ++i) {
- usb_disable_endpoint(dev, i);
- usb_disable_endpoint(dev, i + USB_DIR_IN);
+ usb_disable_endpoint(dev, i, true);
+ usb_disable_endpoint(dev, i + USB_DIR_IN, true);
}
config = dev->actconfig;
struct usb_interface *intf = config->interface[i];
struct usb_host_interface *alt;
- usb_remove_sysfs_intf_files(intf);
alt = usb_altnum_to_altsetting(intf, 0);
/* No altsetting 0? We'll assume the first altsetting.
if (!alt)
alt = &intf->altsetting[0];
+ if (alt != intf->cur_altsetting) {
+ remove_intf_ep_devs(intf);
+ usb_remove_sysfs_intf_files(intf);
+ }
intf->cur_altsetting = alt;
- usb_enable_interface(dev, intf);
- if (device_is_registered(&intf->dev))
+ usb_enable_interface(dev, intf, true);
+ if (device_is_registered(&intf->dev)) {
usb_create_sysfs_intf_files(intf);
+ create_intf_ep_devs(intf);
+ }
}
return 0;
}
return retval;
}
+
+/*
+ * Internal function to queue a device reset
+ *
+ * This is initialized into the workstruct in 'struct
+ * usb_device->reset_ws' that is launched by
+ * message.c:usb_set_configuration() when initializing each 'struct
+ * usb_interface'.
+ *
+ * It is safe to get the USB device without reference counts because
+ * the life cycle of @iface is bound to the life cycle of @udev. Then,
+ * this function will be ran only if @iface is alive (and before
+ * freeing it any scheduled instances of it will have been cancelled).
+ *
+ * We need to set a flag (usb_dev->reset_running) because when we call
+ * the reset, the interfaces might be unbound. The current interface
+ * cannot try to remove the queued work as it would cause a deadlock
+ * (you cannot remove your work from within your executing
+ * workqueue). This flag lets it know, so that
+ * usb_cancel_queued_reset() doesn't try to do it.
+ *
+ * See usb_queue_reset_device() for more details
+ */
+void __usb_queue_reset_device(struct work_struct *ws)
+{
+ int rc;
+ struct usb_interface *iface =
+ container_of(ws, struct usb_interface, reset_ws);
+ struct usb_device *udev = interface_to_usbdev(iface);
+
+ rc = usb_lock_device_for_reset(udev, iface);
+ if (rc >= 0) {
+ iface->reset_running = 1;
+ usb_reset_device(udev);
+ iface->reset_running = 0;
+ usb_unlock_device(udev);
+ }
+}
+
+
/*
* usb_set_configuration - Makes a particular device setting be current
* @dev: the device whose configuration is being updated
if (dev->state != USB_STATE_ADDRESS)
usb_disable_device(dev, 1); /* Skip ep0 */
+ /* Get rid of pending async Set-Config requests for this device */
+ cancel_async_set_config(dev);
+
ret = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
USB_REQ_SET_CONFIGURATION, 0, configuration, 0,
NULL, 0, USB_CTRL_SET_TIMEOUT);
alt = &intf->altsetting[0];
intf->cur_altsetting = alt;
- usb_enable_interface(dev, intf);
+ usb_enable_interface(dev, intf, true);
intf->dev.parent = &dev->dev;
intf->dev.driver = NULL;
intf->dev.bus = &usb_bus_type;
intf->dev.type = &usb_if_device_type;
intf->dev.groups = usb_interface_groups;
intf->dev.dma_mask = dev->dev.dma_mask;
+ INIT_WORK(&intf->reset_ws, __usb_queue_reset_device);
device_initialize(&intf->dev);
mark_quiesced(intf);
dev_set_name(&intf->dev, "%d-%s:%d.%d",
dev_name(&intf->dev), ret);
continue;
}
- usb_create_sysfs_intf_files(intf);
+ create_intf_ep_devs(intf);
}
usb_autosuspend_device(dev);
return 0;
}
+static LIST_HEAD(set_config_list);
+static DEFINE_SPINLOCK(set_config_lock);
+
struct set_config_request {
struct usb_device *udev;
int config;
struct work_struct work;
+ struct list_head node;
};
/* Worker routine for usb_driver_set_configuration() */
{
struct set_config_request *req =
container_of(work, struct set_config_request, work);
+ struct usb_device *udev = req->udev;
+
+ usb_lock_device(udev);
+ spin_lock(&set_config_lock);
+ list_del(&req->node);
+ spin_unlock(&set_config_lock);
- usb_lock_device(req->udev);
- usb_set_configuration(req->udev, req->config);
- usb_unlock_device(req->udev);
- usb_put_dev(req->udev);
+ if (req->config >= -1) /* Is req still valid? */
+ usb_set_configuration(udev, req->config);
+ usb_unlock_device(udev);
+ usb_put_dev(udev);
kfree(req);
}
+/* Cancel pending Set-Config requests for a device whose configuration
+ * was just changed
+ */
+static void cancel_async_set_config(struct usb_device *udev)
+{
+ struct set_config_request *req;
+
+ spin_lock(&set_config_lock);
+ list_for_each_entry(req, &set_config_list, node) {
+ if (req->udev == udev)
+ req->config = -999; /* Mark as cancelled */
+ }
+ spin_unlock(&set_config_lock);
+}
+
/**
* usb_driver_set_configuration - Provide a way for drivers to change device configurations
* @udev: the device whose configuration is being updated
req->config = config;
INIT_WORK(&req->work, driver_set_config_work);
+ spin_lock(&set_config_lock);
+ list_add(&req->node, &set_config_list);
+ spin_unlock(&set_config_lock);
+
usb_get_dev(udev);
schedule_work(&req->work);
return 0;
projects / linux-2.6-omap-h63xx.git / blobdiff