linux-kernel - Re: [PATCH RESEND 3/3] usb: gadget: udc: atmel: implement .pullup callback

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Date:   Wed, 15 Jul 2020 23:58:01 +0200
From:   Alexandre Belloni <alexandre.belloni@...tlin.com>
To:     Michał Mirosław <mirq-linux@...e.qmqm.pl>
Cc:     Cristian Birsan <cristian.birsan@...rochip.com>,
        Felipe Balbi <balbi@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Ludovic Desroches <ludovic.desroches@...rochip.com>,
        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        Songjun Wu <songjun.wu@...el.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-usb@...r.kernel.org
Subject: Re: [PATCH RESEND 3/3] usb: gadget: udc: atmel: implement .pullup
 callback

On 08/07/2020 20:04:10+0200, Michał Mirosław wrote:
> Implement udc->pullup callback, so that udc_connect/disconnect work.
> This is needed for composite gadget, as it assumes udc_disconnect()
> actually works and calls its ->disconnect callback.
> 
> Signed-off-by: Michał Mirosław <mirq-linux@...e.qmqm.pl>
Acked-by: Alexandre Belloni <alexandre.belloni@...tlin.com>

> ---
>  drivers/usb/gadget/udc/atmel_usba_udc.c | 20 ++++++++++++++++++++
>  1 file changed, 20 insertions(+)
> 
> diff --git a/drivers/usb/gadget/udc/atmel_usba_udc.c b/drivers/usb/gadget/udc/atmel_usba_udc.c
> index 9342a3d24963..c5128c229c52 100644
> --- a/drivers/usb/gadget/udc/atmel_usba_udc.c
> +++ b/drivers/usb/gadget/udc/atmel_usba_udc.c
> @@ -1028,6 +1028,7 @@ usba_udc_set_selfpowered(struct usb_gadget *gadget, int is_selfpowered)
>  	return 0;
>  }
>  
> +static int atmel_usba_pullup(struct usb_gadget *gadget, int is_on);
>  static int atmel_usba_start(struct usb_gadget *gadget,
>  		struct usb_gadget_driver *driver);
>  static int atmel_usba_stop(struct usb_gadget *gadget);
> @@ -1101,6 +1102,7 @@ static const struct usb_gadget_ops usba_udc_ops = {
>  	.get_frame		= usba_udc_get_frame,
>  	.wakeup			= usba_udc_wakeup,
>  	.set_selfpowered	= usba_udc_set_selfpowered,
> +	.pullup			= atmel_usba_pullup,
>  	.udc_start		= atmel_usba_start,
>  	.udc_stop		= atmel_usba_stop,
>  	.match_ep		= atmel_usba_match_ep,
> @@ -1957,6 +1959,24 @@ static irqreturn_t usba_vbus_irq_thread(int irq, void *devid)
>  	return IRQ_HANDLED;
>  }
>  
> +static int atmel_usba_pullup(struct usb_gadget *gadget, int is_on)
> +{
> +	struct usba_udc *udc = container_of(gadget, struct usba_udc, gadget);
> +	unsigned long flags;
> +	u32 ctrl;
> +
> +	spin_lock_irqsave(&udc->lock, flags);
> +	ctrl = usba_readl(udc, CTRL);
> +	if (is_on)
> +		ctrl &= ~USBA_DETACH;
> +	else
> +		ctrl |= USBA_DETACH;
> +	usba_writel(udc, CTRL, ctrl);
> +	spin_unlock_irqrestore(&udc->lock, flags);
> +
> +	return 0;
> +}
> +
>  static int atmel_usba_start(struct usb_gadget *gadget,
>  		struct usb_gadget_driver *driver)
>  {
> -- 
> 2.20.1
> 

-- 
Alexandre Belloni, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com