linux-kernel - Re: [PATCH v6 7/9] usb: misc: onboard_dev: add support for non-hub devices

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Message-ID: <ZeDgfIojODIbhs6N@google.com>
Date: Thu, 29 Feb 2024 19:52:28 +0000
From: Matthias Kaehlcke <mka@...omium.org>
To: Javier Carrasco <javier.carrasco@...fvision.net>
Cc: Liam Girdwood <lgirdwood@...il.com>, Mark Brown <broonie@...nel.org>,
	Rob Herring <robh+dt@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Helen Koike <helen.koike@...labora.com>,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will@...nel.org>, Russell King <linux@...linux.org.uk>,
	linux-sound@...r.kernel.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
	dri-devel@...ts.freedesktop.org,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v6 7/9] usb: misc: onboard_dev: add support for non-hub
 devices

On Thu, Feb 29, 2024 at 09:34:50AM +0100, Javier Carrasco wrote:
> Most of the functionality this driver provides can be used by non-hub
> devices as well.
> 
> To account for the hub-specific code, add a flag to the device data
> structure and check its value for hub-specific code.
> 
> The 'always_powered_in_supend' attribute is only available for hub
> devices, keeping the driver's default behavior for non-hub devices (keep
> on in suspend).
> 
> Signed-off-by: Javier Carrasco <javier.carrasco@...fvision.net>
> ---
>  drivers/usb/misc/onboard_usb_dev.c | 25 ++++++++++++++++++++++++-
>  drivers/usb/misc/onboard_usb_dev.h | 10 ++++++++++
>  2 files changed, 34 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/usb/misc/onboard_usb_dev.c b/drivers/usb/misc/onboard_usb_dev.c
> index 4ae580445408..f1b174503c44 100644
> --- a/drivers/usb/misc/onboard_usb_dev.c
> +++ b/drivers/usb/misc/onboard_usb_dev.c
> @@ -261,7 +261,27 @@ static struct attribute *onboard_dev_attrs[] = {
>  	&dev_attr_always_powered_in_suspend.attr,
>  	NULL,
>  };
> -ATTRIBUTE_GROUPS(onboard_dev);
> +
> +static umode_t onboard_dev_attrs_are_visible(struct kobject *kobj,
> +					     struct attribute *attr,
> +					     int n)
> +{
> +	struct device *dev = kobj_to_dev(kobj);
> +	struct onboard_dev *onboard_dev = dev_get_drvdata(dev);
> +
> +	if (attr == &dev_attr_always_powered_in_suspend.attr &&
> +	    !onboard_dev->pdata->is_hub)
> +		return 0;
> +
> +	return attr->mode;
> +}
> +
> +static const struct attribute_group onboard_dev_group = {
> +	.is_visible = onboard_dev_attrs_are_visible,
> +	.attrs = onboard_dev_attrs,
> +};
> +__ATTRIBUTE_GROUPS(onboard_dev);
> +

nit: remove one empty line

>  
>  static void onboard_dev_attach_usb_driver(struct work_struct *work)
>  {
> @@ -286,6 +306,9 @@ static int onboard_dev_probe(struct platform_device *pdev)
>  	if (!onboard_dev->pdata)
>  		return -EINVAL;
>  
> +	if (!onboard_dev->pdata->is_hub)
> +		onboard_dev->always_powered_in_suspend = true;
> +
>  	onboard_dev->dev = dev;
>  
>  	err = onboard_dev_get_regulators(onboard_dev);
> diff --git a/drivers/usb/misc/onboard_usb_dev.h b/drivers/usb/misc/onboard_usb_dev.h
> index 4da9f3b7f9e9..58cf8c81b2cf 100644
> --- a/drivers/usb/misc/onboard_usb_dev.h
> +++ b/drivers/usb/misc/onboard_usb_dev.h
> @@ -12,60 +12,70 @@ struct onboard_dev_pdata {
>  	unsigned long reset_us;		/* reset pulse width in us */
>  	unsigned int num_supplies;	/* number of supplies */
>  	const char * const supply_names[MAX_SUPPLIES];
> +	bool is_hub;			/* true if the device is a HUB */

nit: either drop the comment (the variable name is pretty self explaining),
or s/HUB/hub/ ('hub' isn't an acronym).

Acked-by: Matthias Kaehlcke <mka@...omium.org>