Michal Sojka 0cfbd328d6 usb: Add LED triggers for USB activity ... With this patch, USB activity can be signaled by blinking a LED. There are two triggers, one for activity on USB host and one for USB gadget. Both triggers should work with all host/device controllers. Tested only with musb. Performace: I measured performance overheads on ARM Cortex-A8 (TI AM335x) running on 600 MHz. Duration of usb_led_activity(): - with no LED attached to the trigger: 2 ± 1 µs - with one GPIO LED attached to the trigger: 2 ± 1 µs or 8 ± 2 µs (two peaks in histogram) Duration of functions calling usb_led_activity() (with this patch applied and no LED attached to the trigger): - __usb_hcd_giveback_urb(): 10 - 25 µs - usb_gadget_giveback_request(): 2 - 6 µs Signed-off-by: Michal Sojka <sojka@merica.cz> Acked-by: Felipe Balbi <balbi@ti.com> Tested-by: Felipe Balbi <balbi@ti.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2014-09-25 17:05:12 +02:00
..
common.c	usb: Rename usb-common.c	2014-09-25 17:02:34 +02:00
led.c	usb: Add LED triggers for USB activity	2014-09-25 17:05:12 +02:00
Makefile	usb: Add LED triggers for USB activity	2014-09-25 17:05:12 +02:00
usb-otg-fsm.c	usb: common: rename phy-fsm-usb.c to usb-otg-fsm.c	2014-05-27 15:29:44 -07:00