Re: [PATCH v2 3/3] [ALSA] portman2x4 - use new parport device model

[Takashi Iwai <tiwai@suse.de>]

On Sat, 30 Jan 2016 10:33:37 +0100,
Sudip Mukherjee wrote:
> 
> Modify portman driver to use the new parallel port device model.
> 
> Signed-off-by: Sudip Mukherjee <sudip@vectorindia.org>

Please be more verbose about your changes.  You didn't test it with
real hardware but just compile-tested, right?  Explain the reason --
why you need/want this conversion, and whether this wouldn't give any
regression or user-visible change.


thanks,

Takashi

> ---
> 
> v2: 
>  1. pardev_cb is initialized while declaring, thus removing the use of
> memset.
>  2. used pdev->id.
>  3. v1 did not have the parport probe callback, but
> we will need the probe callback for binding as the name of the driver
> and the name of the device is different.
>  4. in v1 I missed modifying snd_portman_probe_port().
> 
>  sound/drivers/portman2x4.c | 53 ++++++++++++++++++++++++++++++++++------------
>  1 file changed, 39 insertions(+), 14 deletions(-)
> 
> diff --git a/sound/drivers/portman2x4.c b/sound/drivers/portman2x4.c
> index 172685d..a22f56c 100644
> --- a/sound/drivers/portman2x4.c
> +++ b/sound/drivers/portman2x4.c
> @@ -650,10 +650,21 @@ static int snd_portman_probe_port(struct parport *p)
>  {
>  	struct pardevice *pardev;
>  	int res;
> -
> -	pardev = parport_register_device(p, DRIVER_NAME,
> -					 NULL, NULL, NULL,
> -					 0, NULL);
> +	struct pardev_cb pdev_cb = {
> +		.preempt = NULL,
> +		.wakeup = NULL,
> +		.private = NULL,
> +		.irq_func = NULL,
> +		.flags = 0,
> +	};
> +
> +	/*
> +	 * Specify the device number as SNDRV_CARDS + 1 so that the
> +	 * device id alloted to this temporary device will never clash
> +	 * with an actual device already registered.
> +	 */
> +	pardev = parport_register_dev_model(p, DRIVER_NAME, &pdev_cb,
> +					    SNDRV_CARDS + 1);
>  	if (!pardev)
>  		return -EIO;
>  
> @@ -703,10 +714,20 @@ static void snd_portman_detach(struct parport *p)
>  	/* nothing to do here */
>  }
>  
> +static int snd_portman_dev_probe(struct pardevice *pardev)
> +{
> +	if (strcmp(pardev->name, DRIVER_NAME))
> +		return -ENODEV;
> +
> +	return 0;
> +}
> +
>  static struct parport_driver portman_parport_driver = {
> -	.name   = "portman2x4",
> -	.attach = snd_portman_attach,
> -	.detach = snd_portman_detach
> +	.name		= "portman2x4",
> +	.probe		= snd_portman_dev_probe,
> +	.match_port	= snd_portman_attach,
> +	.detach		= snd_portman_detach,
> +	.devmodel	= true,
>  };
>  
>  /*********************************************************************
> @@ -734,6 +755,12 @@ static int snd_portman_probe(struct platform_device *pdev)
>  	struct snd_card *card = NULL;
>  	struct portman *pm = NULL;
>  	int err;
> +	struct pardev_cb portman_cb = {
> +		.preempt = NULL,
> +		.wakeup = NULL,
> +		.irq_func = snd_portman_interrupt,	/* ISR */
> +		.flags = PARPORT_DEV_EXCL,		/* flags */
> +	};
>  
>  	p = platform_get_drvdata(pdev);
>  	platform_set_drvdata(pdev, NULL);
> @@ -758,13 +785,11 @@ static int snd_portman_probe(struct platform_device *pdev)
>  	sprintf(card->longname,  "%s at 0x%lx, irq %i",
>  		card->shortname, p->base, p->irq);
>  
> -	pardev = parport_register_device(p,                     /* port */
> -					 DRIVER_NAME,           /* name */
> -					 NULL,                  /* preempt */
> -					 NULL,                  /* wakeup */
> -					 snd_portman_interrupt, /* ISR */
> -					 PARPORT_DEV_EXCL,      /* flags */
> -					 (void *)card);         /* private */
> +	portman_cb.private = card;			   /* private */
> +	pardev = parport_register_dev_model(p,		   /* port */
> +					    DRIVER_NAME,   /* name */
> +					    &portman_cb,   /* callbacks */
> +					    pdev->id);	   /* device number */
>  	if (pardev == NULL) {
>  		snd_printd("Cannot register pardevice\n");
>  		err = -EIO;
> -- 
> 1.9.1
> 
>