diff options
Diffstat (limited to 'drivers/usb/core/message.c')
| -rw-r--r-- | drivers/usb/core/message.c | 83 |
1 files changed, 79 insertions, 4 deletions
diff --git a/drivers/usb/core/message.c b/drivers/usb/core/message.c index 217a3d6d0a06..b7434787db5f 100644 --- a/drivers/usb/core/message.c +++ b/drivers/usb/core/message.c @@ -412,10 +412,24 @@ int usb_sg_init ( io->urbs [i]->status = -EINPROGRESS; io->urbs [i]->actual_length = 0; + /* + * Some systems need to revert to PIO when DMA is temporarily + * unavailable. For their sakes, both transfer_buffer and + * transfer_dma are set when possible. However this can only + * work on systems without HIGHMEM, since DMA buffers located + * in high memory are not directly addressable by the CPU for + * PIO ... so when HIGHMEM is in use, transfer_buffer is NULL + * to prevent stale pointers and to help spot bugs. + */ if (dma) { - /* hc may use _only_ transfer_dma */ io->urbs [i]->transfer_dma = sg_dma_address (sg + i); len = sg_dma_len (sg + i); +#ifdef CONFIG_HIGHMEM + io->urbs[i]->transfer_buffer = NULL; +#else + io->urbs[i]->transfer_buffer = + page_address(sg[i].page) + sg[i].offset; +#endif } else { /* hc may use _only_ transfer_buffer */ io->urbs [i]->transfer_buffer = @@ -1305,7 +1319,7 @@ int usb_reset_configuration(struct usb_device *dev) return 0; } -static void release_interface(struct device *dev) +void usb_release_interface(struct device *dev) { struct usb_interface *intf = to_usb_interface(dev); struct usb_interface_cache *intfc = @@ -1315,6 +1329,67 @@ static void release_interface(struct device *dev) kfree(intf); } +#ifdef CONFIG_HOTPLUG +static int usb_if_uevent(struct device *dev, char **envp, int num_envp, + char *buffer, int buffer_size) +{ + struct usb_device *usb_dev; + struct usb_interface *intf; + struct usb_host_interface *alt; + int i = 0; + int length = 0; + + if (!dev) + return -ENODEV; + + /* driver is often null here; dev_dbg() would oops */ + pr_debug ("usb %s: uevent\n", dev->bus_id); + + intf = to_usb_interface(dev); + usb_dev = interface_to_usbdev(intf); + alt = intf->cur_altsetting; + + if (add_uevent_var(envp, num_envp, &i, + buffer, buffer_size, &length, + "INTERFACE=%d/%d/%d", + alt->desc.bInterfaceClass, + alt->desc.bInterfaceSubClass, + alt->desc.bInterfaceProtocol)) + return -ENOMEM; + + if (add_uevent_var(envp, num_envp, &i, + buffer, buffer_size, &length, + "MODALIAS=usb:v%04Xp%04Xd%04Xdc%02Xdsc%02Xdp%02Xic%02Xisc%02Xip%02X", + le16_to_cpu(usb_dev->descriptor.idVendor), + le16_to_cpu(usb_dev->descriptor.idProduct), + le16_to_cpu(usb_dev->descriptor.bcdDevice), + usb_dev->descriptor.bDeviceClass, + usb_dev->descriptor.bDeviceSubClass, + usb_dev->descriptor.bDeviceProtocol, + alt->desc.bInterfaceClass, + alt->desc.bInterfaceSubClass, + alt->desc.bInterfaceProtocol)) + return -ENOMEM; + + envp[i] = NULL; + return 0; +} + +#else + +static int usb_if_uevent(struct device *dev, char **envp, + int num_envp, char *buffer, int buffer_size) +{ + return -ENODEV; +} +#endif /* CONFIG_HOTPLUG */ + +struct device_type usb_if_device_type = { + .name = "usb_interface", + .release = usb_release_interface, + .uevent = usb_if_uevent, +}; + /* * usb_set_configuration - Makes a particular device setting be current * @dev: the device whose configuration is being updated @@ -1349,7 +1424,7 @@ static void release_interface(struct device *dev) * * This call is synchronous. The calling context must be able to sleep, * must own the device lock, and must not hold the driver model's USB - * bus rwsem; usb device driver probe() methods cannot use this routine. + * bus mutex; usb device driver probe() methods cannot use this routine. * * Returns zero on success, or else the status code returned by the * underlying call that failed. On successful completion, each interface @@ -1478,8 +1553,8 @@ free_interfaces: intf->dev.parent = &dev->dev; intf->dev.driver = NULL; intf->dev.bus = &usb_bus_type; + intf->dev.type = &usb_if_device_type; intf->dev.dma_mask = dev->dev.dma_mask; - intf->dev.release = release_interface; device_initialize (&intf->dev); mark_quiesced(intf); sprintf (&intf->dev.bus_id[0], "%d-%s:%d.%d", |