linux-kernel - Re: [PATCH 1/2] leds: usb: Add LED trigger for USB gadget activity

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Date:	Fri, 22 Aug 2014 16:59:24 -0500
From:	Felipe Balbi <balbi@...com>
To:	Michal Sojka <sojka@...ica.cz>
CC:	<linux-leds@...r.kernel.org>, <michal.vokac@...ap.cz>,
	Bryan Wu <cooloney@...il.com>,
	Richard Purdie <rpurdie@...ys.net>,
	Felipe Balbi <balbi@...com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	<linux-kernel@...r.kernel.org>, <linux-usb@...r.kernel.org>
Subject: Re: [PATCH 1/2] leds: usb: Add LED trigger for USB gadget activity

Hi,

On Fri, Aug 22, 2014 at 01:53:12PM +0200, Michal Sojka wrote:
> With this patch, USB gadget activity can be signaled by blinking a LED.
> 
> Since there is no generic code where to put the trigger for all USB
> controllers, each USB controller needs to call the trigger individually.
> This patch adds the call only for the musb controller where I can test
> it.
> 
> Signed-off-by: Michal Sojka <sojka@...ica.cz>
> ---
>  drivers/leds/trigger/Kconfig             |  8 ++++++
>  drivers/leds/trigger/Makefile            |  1 +
>  drivers/leds/trigger/ledtrig-usbgadget.c | 45 ++++++++++++++++++++++++++++++++
>  drivers/usb/musb/musb_gadget.c           |  6 +++--
>  include/linux/leds.h                     |  6 +++++
>  5 files changed, 64 insertions(+), 2 deletions(-)
>  create mode 100644 drivers/leds/trigger/ledtrig-usbgadget.c
> 
> diff --git a/drivers/leds/trigger/Kconfig b/drivers/leds/trigger/Kconfig
> index 49794b4..9562963 100644
> --- a/drivers/leds/trigger/Kconfig
> +++ b/drivers/leds/trigger/Kconfig
> @@ -41,6 +41,14 @@ config LEDS_TRIGGER_IDE_DISK
>  	  This allows LEDs to be controlled by IDE disk activity.
>  	  If unsure, say Y.
>  
> +config LEDS_TRIGGER_USBGADGET
> +	bool "LED USB Gadget Trigger"
> +	depends on (USB_MUSB_GADGET || USB_MUSB_DUAL_ROLE)
> +	depends on LEDS_TRIGGERS
> +	help
> +	  This allows LEDs to be controlled by USB gadget activity.
> +	  If unsure, say Y.
> +
>  config LEDS_TRIGGER_HEARTBEAT
>  	tristate "LED Heartbeat Trigger"
>  	depends on LEDS_TRIGGERS
> diff --git a/drivers/leds/trigger/Makefile b/drivers/leds/trigger/Makefile
> index 1abf48d..45917c0 100644
> --- a/drivers/leds/trigger/Makefile
> +++ b/drivers/leds/trigger/Makefile
> @@ -8,3 +8,4 @@ obj-$(CONFIG_LEDS_TRIGGER_CPU)		+= ledtrig-cpu.o
>  obj-$(CONFIG_LEDS_TRIGGER_DEFAULT_ON)	+= ledtrig-default-on.o
>  obj-$(CONFIG_LEDS_TRIGGER_TRANSIENT)	+= ledtrig-transient.o
>  obj-$(CONFIG_LEDS_TRIGGER_CAMERA)	+= ledtrig-camera.o
> +obj-$(CONFIG_LEDS_TRIGGER_USBGADGET)	+= ledtrig-usbgadget.o
> diff --git a/drivers/leds/trigger/ledtrig-usbgadget.c b/drivers/leds/trigger/ledtrig-usbgadget.c
> new file mode 100644
> index 0000000..1eb90da
> --- /dev/null
> +++ b/drivers/leds/trigger/ledtrig-usbgadget.c
> @@ -0,0 +1,45 @@
> +/*
> + * LED Trigger for USB Gadget Activity
> + *
> + * Copyright 2014 Michal Sojka <sojka@...ica.cz>
> + *
> + * 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>
> +
> +#define BLINK_DELAY 30
> +
> +DEFINE_LED_TRIGGER(ledtrig_usbgadget);
> +static unsigned long usbgadget_blink_delay = BLINK_DELAY;
> +
> +void ledtrig_usbgadget_activity(void)
> +{
> +	led_trigger_blink_oneshot(ledtrig_usbgadget,
> +				  &usbgadget_blink_delay, &usbgadget_blink_delay, 0);
> +}
> +EXPORT_SYMBOL(ledtrig_usbgadget_activity);
> +
> +static int __init ledtrig_usbgadget_init(void)
> +{
> +	led_trigger_register_simple("usb-gadget", &ledtrig_usbgadget);
> +	return 0;
> +}
> +
> +static void __exit ledtrig_usbgadget_exit(void)
> +{
> +	led_trigger_unregister_simple(ledtrig_usbgadget);
> +}
> +
> +module_init(ledtrig_usbgadget_init);
> +module_exit(ledtrig_usbgadget_exit);
> +
> +MODULE_AUTHOR("Michal Sojka <sojka@...ica.cz>");
> +MODULE_DESCRIPTION("LED Trigger for USB Gadget Activity");
> +MODULE_LICENSE("GPL");
> diff --git a/drivers/usb/musb/musb_gadget.c b/drivers/usb/musb/musb_gadget.c
> index d4aa779..98f8b24 100644
> --- a/drivers/usb/musb/musb_gadget.c
> +++ b/drivers/usb/musb/musb_gadget.c
> @@ -42,6 +42,7 @@
>  #include <linux/delay.h>
>  #include <linux/dma-mapping.h>
>  #include <linux/slab.h>
> +#include <linux/leds.h>
>  
>  #include "musb_core.h"
>  
> @@ -167,11 +168,12 @@ __acquires(ep->musb->lock)
>  	if (!dma_mapping_error(&musb->g.dev, request->dma))
>  		unmap_dma_buffer(req, musb);
>  
> -	if (request->status == 0)
> +	if (request->status == 0) {
>  		dev_dbg(musb->controller, "%s done request %p,  %d/%d\n",
>  				ep->end_point.name, request,
>  				req->request.actual, req->request.length);
> -	else
> +		ledtrig_usbgadget_activity();

looks like this should, somehow, be done at udc-core.c although you'd
need some refactoring to make that happen. It shouldn't be too difficult
to have a generic usb_gadget_giveback_request()

cheers

-- 
balbi

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