linux-kernel - Re: [PATCH v5 WIP 2/5] staging: panel: use new parport device model

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Message-ID: <20150520102349.25c5d4a8@endymion.delvare>
Date:	Wed, 20 May 2015 10:23:49 +0200
From:	Jean Delvare <jdelvare@...e.de>
To:	Sudip Mukherjee <sudipm.mukherjee@...il.com>
Cc:	Greg KH <gregkh@...uxfoundation.org>,
	Dan Carpenter <dan.carpenter@...cle.com>,
	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 WIP 2/5] staging: panel: use new parport device model

Hi Sudip,

On Wed,  6 May 2015 15:46:14 +0530, Sudip Mukherjee wrote:
> converted to use the new device-model parallel port.

Hmm, leading capital? :-D

> 
> Signed-off-by: Sudip Mukherjee <sudip@...torindia.org>
> ---
>  drivers/staging/panel/panel.c | 20 +++++++++++++++-----
>  1 file changed, 15 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/staging/panel/panel.c b/drivers/staging/panel/panel.c
> index 1d8ed8b..772a82a 100644
> --- a/drivers/staging/panel/panel.c
> +++ b/drivers/staging/panel/panel.c
> @@ -2188,6 +2188,18 @@ static struct notifier_block panel_notifier = {
>  	0
>  };
>  
> +static int panel_probe(struct pardevice *par_dev)
> +{
> +	if (strcmp(par_dev->name, "panel"))
> +		return -ENODEV;
> +	return 0;
> +}
> +
> +struct pardev_cb panel_cb = {

If this stays there, it should be static. And it could be const as you
never modify it. But as with i2c-parport I believe this variable should
be local to function panel_attach().

> +	.flags = 0,     /*PARPORT_DEV_EXCL */

0/NULL fields don't need to be explicitly initialized.

> +	.private = &pprt,
> +};
> +
>  static void panel_attach(struct parport *port)
>  {
>  	if (port->number != parport)
> @@ -2199,10 +2211,7 @@ static void panel_attach(struct parport *port)
>  		return;
>  	}
>  
> -	pprt = parport_register_device(port, "panel", NULL, NULL,  /* pf, kf */
> -				       NULL,
> -				       /*PARPORT_DEV_EXCL */
> -				       0, (void *)&pprt);
> +	pprt = parport_register_dev_model(port, "panel", &panel_cb, 0);
>  	if (pprt == NULL) {
>  		pr_err("%s: port->number=%d parport=%d, parport_register_device() failed\n",
>  		       __func__, port->number, parport);
> @@ -2256,8 +2265,9 @@ static void panel_detach(struct parport *port)
>  
>  static struct parport_driver panel_driver = {
>  	.name = "panel",
> -	.attach = panel_attach,
> +	.match_port = panel_attach,
>  	.detach = panel_detach,
> +	.probe = panel_probe,
>  };
>  
>  /* init function */


-- 
Jean Delvare
SUSE L3 Support
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