linux-kernel - Re: [PATCH 1/4] usb: musb: Call atomic_notifier_call

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Date:	Tue, 17 Sep 2013 10:48:59 -0500
From:	Felipe Balbi <balbi@...com>
To:	Pali Rohár <pali.rohar@...il.com>
CC:	Tony Lindgren <tony@...mide.com>,
	Anton Vorontsov <anton@...msg.org>,
	Russell King <linux@....linux.org.uk>,
	David Woodhouse <dwmw2@...radead.org>,
	Felipe Balbi <balbi@...com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	<linux-omap@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, <linux-usb@...r.kernel.org>,
	<freemangordon@....bg>, <aaro.koskinen@....fi>, <pavel@....cz>
Subject: Re: [PATCH 1/4] usb: musb: Call atomic_notifier_call_chain when
 status is changed

On Sun, Sep 08, 2013 at 10:50:36AM +0200, Pali Rohár wrote:
> More power supply drivers depends on vbus events and without it they not
> working. Power supply drivers using usb_register_notifier, so to deliver
> events it is needed to call atomic_notifier_call_chain.
> 
> So without atomic notifier power supply driver isp1704 not retrieving
> vbus status and reporting bogus values to userspace and also to board
> platform data functions. Without proper data charger drivers trying to
> charge battery also when charger is disconnected or do not start charging
> when wallcharger connects.
> 
> Atomic notifier in musb driver was used before v3.5 and was replaced with
> omap mailbox. This patch adding atomic_notifier_call_chain call from
> function omap_musb_set_mailbox.
> 
> Signed-off-by: Pali Rohár <pali.rohar@...il.com>
> ---
>  drivers/usb/musb/omap2430.c       |    3 +++
>  drivers/usb/phy/phy-twl4030-usb.c |    2 ++
>  2 files changed, 5 insertions(+)
> 
> diff --git a/drivers/usb/musb/omap2430.c b/drivers/usb/musb/omap2430.c
> index f44e8b5..5c40252 100644
> --- a/drivers/usb/musb/omap2430.c
> +++ b/drivers/usb/musb/omap2430.c
> @@ -305,6 +305,9 @@ static void omap_musb_set_mailbox(struct omap2430_glue *glue)
>  	default:
>  		dev_dbg(dev, "ID float\n");
>  	}
> +
> +	atomic_notifier_call_chain(&musb->xceiv->notifier,
> +			musb->xceiv->last_event, NULL);

let's add a wrapper for this:

static inline int usb_phy_notify(struct usb phy *x, unsigned val, void *v)
{
	return atomic_notifier_call_chain(&x->notifier, val, v);
}

-- 
balbi

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