diff options
| -rw-r--r-- | drivers/usb/storage/uas-detect.h | 40 | ||||
| -rw-r--r-- | drivers/usb/storage/uas.c | 40 |
2 files changed, 42 insertions, 38 deletions
diff --git a/drivers/usb/storage/uas-detect.h b/drivers/usb/storage/uas-detect.h new file mode 100644 index 000000000000..28101c7e6a9f --- /dev/null +++ b/drivers/usb/storage/uas-detect.h @@ -0,0 +1,40 @@ +#include <linux/usb.h> +#include <linux/usb/hcd.h> + +static int uas_is_interface(struct usb_host_interface *intf) +{ + return (intf->desc.bInterfaceClass == USB_CLASS_MASS_STORAGE && + intf->desc.bInterfaceSubClass == USB_SC_SCSI && + intf->desc.bInterfaceProtocol == USB_PR_UAS); +} + +static int uas_isnt_supported(struct usb_device *udev) +{ + struct usb_hcd *hcd = bus_to_hcd(udev->bus); + + dev_warn(&udev->dev, "The driver for the USB controller %s does not " + "support scatter-gather which is\n", + hcd->driver->description); + dev_warn(&udev->dev, "required by the UAS driver. Please try an" + "alternative USB controller if you wish to use UAS.\n"); + return -ENODEV; +} + +static int uas_find_uas_alt_setting(struct usb_interface *intf) +{ + int i; + struct usb_device *udev = interface_to_usbdev(intf); + int sg_supported = udev->bus->sg_tablesize != 0; + + for (i = 0; i < intf->num_altsetting; i++) { + struct usb_host_interface *alt = &intf->altsetting[i]; + + if (uas_is_interface(alt)) { + if (!sg_supported) + return uas_isnt_supported(udev); + return alt->desc.bAlternateSetting; + } + } + + return -ENODEV; +} diff --git a/drivers/usb/storage/uas.c b/drivers/usb/storage/uas.c index 54db36541b93..6ea892f32f74 100644 --- a/drivers/usb/storage/uas.c +++ b/drivers/usb/storage/uas.c @@ -25,6 +25,8 @@ #include <scsi/scsi_host.h> #include <scsi/scsi_tcq.h> +#include "uas-detect.h" + /* * The r00-r01c specs define this version of the SENSE IU data structure. * It's still in use by several different firmware releases. @@ -873,44 +875,6 @@ static struct usb_device_id uas_usb_ids[] = { }; MODULE_DEVICE_TABLE(usb, uas_usb_ids); -static int uas_is_interface(struct usb_host_interface *intf) -{ - return (intf->desc.bInterfaceClass == USB_CLASS_MASS_STORAGE && - intf->desc.bInterfaceSubClass == USB_SC_SCSI && - intf->desc.bInterfaceProtocol == USB_PR_UAS); -} - -static int uas_isnt_supported(struct usb_device *udev) -{ - struct usb_hcd *hcd = bus_to_hcd(udev->bus); - - dev_warn(&udev->dev, "The driver for the USB controller %s does not " - "support scatter-gather which is\n", - hcd->driver->description); - dev_warn(&udev->dev, "required by the UAS driver. Please try an" - "alternative USB controller if you wish to use UAS.\n"); - return -ENODEV; -} - -static int uas_find_uas_alt_setting(struct usb_interface *intf) -{ - int i; - struct usb_device *udev = interface_to_usbdev(intf); - int sg_supported = udev->bus->sg_tablesize != 0; - - for (i = 0; i < intf->num_altsetting; i++) { - struct usb_host_interface *alt = &intf->altsetting[i]; - - if (uas_is_interface(alt)) { - if (!sg_supported) - return uas_isnt_supported(udev); - return alt->desc.bAlternateSetting; - } - } - - return -ENODEV; -} - static int uas_switch_interface(struct usb_device *udev, struct usb_interface *intf) { |