diff options
Diffstat (limited to 'include/linux/usb.h')
-rw-r--r-- | include/linux/usb.h | 18 |
1 files changed, 13 insertions, 5 deletions
diff --git a/include/linux/usb.h b/include/linux/usb.h index 8c9f053111bb..ce1323c4e47c 100644 --- a/include/linux/usb.h +++ b/include/linux/usb.h | |||
@@ -1055,7 +1055,8 @@ typedef void (*usb_complete_t)(struct urb *); | |||
1055 | * @number_of_packets: Lists the number of ISO transfer buffers. | 1055 | * @number_of_packets: Lists the number of ISO transfer buffers. |
1056 | * @interval: Specifies the polling interval for interrupt or isochronous | 1056 | * @interval: Specifies the polling interval for interrupt or isochronous |
1057 | * transfers. The units are frames (milliseconds) for full and low | 1057 | * transfers. The units are frames (milliseconds) for full and low |
1058 | * speed devices, and microframes (1/8 millisecond) for highspeed ones. | 1058 | * speed devices, and microframes (1/8 millisecond) for highspeed |
1059 | * and SuperSpeed devices. | ||
1059 | * @error_count: Returns the number of ISO transfers that reported errors. | 1060 | * @error_count: Returns the number of ISO transfers that reported errors. |
1060 | * @context: For use in completion functions. This normally points to | 1061 | * @context: For use in completion functions. This normally points to |
1061 | * request-specific driver context. | 1062 | * request-specific driver context. |
@@ -1286,9 +1287,16 @@ static inline void usb_fill_bulk_urb(struct urb *urb, | |||
1286 | * | 1287 | * |
1287 | * Initializes a interrupt urb with the proper information needed to submit | 1288 | * Initializes a interrupt urb with the proper information needed to submit |
1288 | * it to a device. | 1289 | * it to a device. |
1289 | * Note that high speed interrupt endpoints use a logarithmic encoding of | 1290 | * |
1290 | * the endpoint interval, and express polling intervals in microframes | 1291 | * Note that High Speed and SuperSpeed interrupt endpoints use a logarithmic |
1291 | * (eight per millisecond) rather than in frames (one per millisecond). | 1292 | * encoding of the endpoint interval, and express polling intervals in |
1293 | * microframes (eight per millisecond) rather than in frames (one per | ||
1294 | * millisecond). | ||
1295 | * | ||
1296 | * Wireless USB also uses the logarithmic encoding, but specifies it in units of | ||
1297 | * 128us instead of 125us. For Wireless USB devices, the interval is passed | ||
1298 | * through to the host controller, rather than being translated into microframe | ||
1299 | * units. | ||
1292 | */ | 1300 | */ |
1293 | static inline void usb_fill_int_urb(struct urb *urb, | 1301 | static inline void usb_fill_int_urb(struct urb *urb, |
1294 | struct usb_device *dev, | 1302 | struct usb_device *dev, |
@@ -1305,7 +1313,7 @@ static inline void usb_fill_int_urb(struct urb *urb, | |||
1305 | urb->transfer_buffer_length = buffer_length; | 1313 | urb->transfer_buffer_length = buffer_length; |
1306 | urb->complete = complete_fn; | 1314 | urb->complete = complete_fn; |
1307 | urb->context = context; | 1315 | urb->context = context; |
1308 | if (dev->speed == USB_SPEED_HIGH) | 1316 | if (dev->speed == USB_SPEED_HIGH || dev->speed == USB_SPEED_SUPER) |
1309 | urb->interval = 1 << (interval - 1); | 1317 | urb->interval = 1 << (interval - 1); |
1310 | else | 1318 | else |
1311 | urb->interval = interval; | 1319 | urb->interval = interval; |