diff options
Diffstat (limited to 'drivers/usb/core/message.c')
| -rw-r--r-- | drivers/usb/core/message.c | 164 |
1 files changed, 140 insertions, 24 deletions
diff --git a/drivers/usb/core/message.c b/drivers/usb/core/message.c index 6d1048faf08..de51667dd64 100644 --- a/drivers/usb/core/message.c +++ b/drivers/usb/core/message.c @@ -18,6 +18,8 @@ #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; @@ -139,9 +141,9 @@ int usb_control_msg(struct usb_device *dev, unsigned int pipe, __u8 request, 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"); */ @@ -1004,6 +1006,34 @@ int usb_clear_halt(struct usb_device *dev, int pipe) } 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 @@ -1092,7 +1122,7 @@ void usb_disable_device(struct usb_device *dev, int skip_ep0) 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); } @@ -1113,22 +1143,26 @@ void usb_disable_device(struct usb_device *dev, int skip_ep0) * 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; @@ -1138,17 +1172,18 @@ void usb_enable_endpoint(struct usb_device *dev, struct usb_host_endpoint *ep) * 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); } /** @@ -1235,8 +1270,10 @@ int usb_set_interface(struct usb_device *dev, int interface, int alternate) */ /* 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); iface->cur_altsetting = alt; @@ -1271,10 +1308,11 @@ int usb_set_interface(struct usb_device *dev, int interface, int alternate) * 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); @@ -1334,7 +1372,6 @@ int usb_reset_configuration(struct usb_device *dev) 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. @@ -1345,10 +1382,16 @@ int usb_reset_configuration(struct usb_device *dev) 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; } @@ -1441,6 +1484,46 @@ static struct usb_interface_assoc_descriptor *find_iad(struct usb_device *dev, 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 @@ -1560,6 +1643,9 @@ free_interfaces: 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); @@ -1604,13 +1690,14 @@ free_interfaces: 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", @@ -1641,17 +1728,21 @@ free_interfaces: 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() */ @@ -1659,14 +1750,35 @@ static void driver_set_config_work(struct work_struct *work) { 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 @@ -1698,6 +1810,10 @@ int usb_driver_set_configuration(struct usb_device *udev, int config) 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; |