ChangeSet 1.1722.97.52, 2004/06/08 16:08:19-07:00, [EMAIL PROTECTED]
[PATCH] USB: usb root hubs can set power budgets
This adds hub_set_power_budget(), mostly so that HCDs for low
powered ports (cell phone, PDA, etc) can more easily report their
true power budgets. It's not always 500mA per root hub port; this
makes dummy_hcd report the minimum, 8mA.
Signed-off-by: David Brownell <[EMAIL PROTECTED]>
Signed-off-by: Greg Kroah-Hartman <[EMAIL PROTECTED]>
drivers/usb/core/hub.h | 11 +++++++++++
drivers/usb/gadget/dummy_hcd.c | 3 +++
2 files changed, 14 insertions(+)
diff -Nru a/drivers/usb/core/hub.h b/drivers/usb/core/hub.h
--- a/drivers/usb/core/hub.h Fri Jun 18 10:59:02 2004
+++ b/drivers/usb/core/hub.h Fri Jun 18 10:59:02 2004
@@ -215,4 +215,15 @@
struct work_struct leds;
};
+/* use this for low-powered root hubs */
+static inline void
+hub_set_power_budget (struct usb_device *hubdev, unsigned mA)
+{
+ struct usb_hub *hub;
+
+ hub = (struct usb_hub *)
+ usb_get_intfdata (hubdev->actconfig->interface[0]);
+ hub->power_budget = min(mA,(unsigned)500)/2;
+}
+
#endif /* __LINUX_HUB_H */
diff -Nru a/drivers/usb/gadget/dummy_hcd.c b/drivers/usb/gadget/dummy_hcd.c
--- a/drivers/usb/gadget/dummy_hcd.c Fri Jun 18 10:59:02 2004
+++ b/drivers/usb/gadget/dummy_hcd.c Fri Jun 18 10:59:02 2004
@@ -1686,6 +1686,9 @@
goto clean1;
}
+ /* only show a low-power port: just 8mA */
+ hub_set_power_budget (root, 8);
+
dum->started = 1;
if ((retval = dummy_register_udc (dum)) != 0) {
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