usb: gadget: consider link speed for bMaxPower

The USB 2.0 specification says that bMaxPower is the maximum power
consumption expressed in 2 mA units and the USB 3.0 specification says
that it is expressed in 8 mA units.

This patch renames bMaxPower to MaxPower and the various /2 and *2 are
removed. Before reporting the config descriptor, the proper value is
computer based on the speed, all in-tree users are updated. MaxPower is
also increased to u16 so we can store the nokia gadget value which is
larger than the max value allowed for u8.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Felipe Balbi <balbi@ti.com>

1 files changed, 3 insertions, 2 deletions

diff --git a/include/linux/usb/composite.h b/include/linux/usb/composite.h
index b09c37e04a91..dc512c9432d7 100644
--- a/include/linux/usb/composite.h
+++ b/include/linux/usb/composite.h
@@ -184,7 +184,8 @@ int config_ep_by_speed(struct usb_gadget *g, struct usb_function *f,
  * @bConfigurationValue: Copied into configuration descriptor.
  * @iConfiguration: Copied into configuration descriptor.
  * @bmAttributes: Copied into configuration descriptor.
- * @bMaxPower: Copied into configuration descriptor.
+ * @MaxPower: Power consumtion in mA. Used to compute bMaxPower in the
+ *      configuration descriptor after considering the bus speed.
  * @cdev: assigned by @usb_add_config() before calling @bind(); this is
  *      the device associated with this configuration.
  *
@@ -230,7 +231,7 @@ struct usb_configuration {
         u8                      bConfigurationValue;
         u8                      iConfiguration;
         u8                      bmAttributes;
-        u8                      bMaxPower;
+        u16                     MaxPower;
 
         struct usb_composite_dev        *cdev;