On Fri, Aug 22, 2014 at 5:08 PM, Michal Sojka <sojka@xxxxxxxxx> wrote:
> With this patch, USB host activity can be signaled by blinking a LED.
>
> This should work with all host controllers. Tested only with musb.
>
> Signed-off-by: Michal Sojka <sojka@xxxxxxxxx>
> ---
> drivers/usb/core/Kconfig | 9 +++++++++
> drivers/usb/core/Makefile | 1 +
> drivers/usb/core/hcd.c | 2 ++
> drivers/usb/core/led.c | 38 ++++++++++++++++++++++++++++++++++++++
> include/linux/usb/hcd.h | 6 ++++++
> 5 files changed, 56 insertions(+)
> create mode 100644 drivers/usb/core/led.c
>
> diff --git a/drivers/usb/core/Kconfig b/drivers/usb/core/Kconfig
> index 1060657..8295f65 100644
> --- a/drivers/usb/core/Kconfig
> +++ b/drivers/usb/core/Kconfig
> @@ -90,3 +90,12 @@ config USB_OTG_FSM
> Implements OTG Finite State Machine as specified in On-The-Go
> and Embedded Host Supplement to the USB Revision 2.0 Specification.
>
> +config USB_HOST_LED
> + bool "USB Host LED Trigger"
> + depends on LEDS_CLASS
> + select LEDS_TRIGGERS
> + help
> + This option adds a LED trigger for USB host controllers.
> +
> + Say Y here if you are working on a system with led-class supported
> + LEDs and you want to use them as USB host activity indicators.
> diff --git a/drivers/usb/core/Makefile b/drivers/usb/core/Makefile
> index 2f6f932..324c8c9 100644
> --- a/drivers/usb/core/Makefile
> +++ b/drivers/usb/core/Makefile
> @@ -9,5 +9,6 @@ usbcore-y += port.o
>
> usbcore-$(CONFIG_PCI) += hcd-pci.o
> usbcore-$(CONFIG_ACPI) += usb-acpi.o
> +usbcore-$(CONFIG_USB_HOST_LED) += led.o
>
> obj-$(CONFIG_USB) += usbcore.o
> diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c
> index 487abcf..46d9f3a 100644
> --- a/drivers/usb/core/hcd.c
> +++ b/drivers/usb/core/hcd.c
> @@ -1664,6 +1664,8 @@ static void __usb_hcd_giveback_urb(struct urb *urb)
> usbmon_urb_complete(&hcd->self, urb, status);
> usb_anchor_suspend_wakeups(anchor);
> usb_unanchor_urb(urb);
> + if (status == 0)
> + usb_hcd_led_activity();
>
> /* pass ownership to the completion handler */
> urb->status = status;
> diff --git a/drivers/usb/core/led.c b/drivers/usb/core/led.c
> new file mode 100644
> index 0000000..49ff76c
> --- /dev/null
> +++ b/drivers/usb/core/led.c
> @@ -0,0 +1,38 @@
> +/*
> + * LED Trigger for USB Host Activity
> + *
> + * Copyright 2014 Michal Sojka <sojka@xxxxxxxxx>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + *
> + */
> +
> +#include <linux/module.h>
> +#include <linux/kernel.h>
> +#include <linux/init.h>
> +#include <linux/leds.h>
> +#include <linux/usb/hcd.h>
> +
> +#define BLINK_DELAY 30
> +
> +DEFINE_LED_TRIGGER(ledtrig_usb_hcd);
Add one more trigger named ledtrig_usb_gadget
> +static unsigned long usb_hcd_blink_delay = BLINK_DELAY;
> +
> +void usb_hcd_led_activity(void)
Give an input parameter like emum usb_led_event.
USB_LED_EVENT_HOST = 0
USB_LED_EVENT_GADGET = 1
> +{
Add case for USB_LED_EVENT_HOST:
> + led_trigger_blink_oneshot(ledtrig_usb_hcd,
> + &usb_hcd_blink_delay, &usb_hcd_blink_delay, 0);
Add case for USB_LED_EVENT_GADGET:
led_trigger_blink_oneshot(ledtrig_usb_gadget,
&usb_gadget_blink_delay,
&usb_gadget_blink_delay, 0);
> +}
> +
> +int __init ledtrig_usb_hcd_init(void)
> +{
> + led_trigger_register_simple("usb-host", &ledtrig_usb_hcd);
register one more trigger for gadget.
> + return 0;
> +}
> +
> +void __exit ledtrig_usb_hcd_exit(void)
> +{
> + led_trigger_unregister_simple(ledtrig_usb_hcd);
unregister one more trigger for gadget.
> +}
> diff --git a/include/linux/usb/hcd.h b/include/linux/usb/hcd.h
> index b43f0fe..eb5fa0f 100644
> --- a/include/linux/usb/hcd.h
> +++ b/include/linux/usb/hcd.h
> @@ -700,6 +700,12 @@ extern struct rw_semaphore ehci_cf_port_reset_rwsem;
> #define USB_EHCI_LOADED 2
> extern unsigned long usb_hcds_loaded;
>
> +#ifdef CONFIG_USB_HOST_LED
> +extern void usb_hcd_led_activity(void);
User can call usb_led_activity(USB_LED_EVENT_HOST);
or usb_led_activity(USB_LED_EVENT_GADGET);
> +#else
> +static inline void usb_hcd_led_activity(void) {}
> +#endif
> +
> #endif /* __KERNEL__ */
>
> #endif /* __USB_CORE_HCD_H */
> --
> 2.1.0
>
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