netdev - Re: [PATCH] hamradio: baycom: use new parport device model

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Date:   Sun, 17 Sep 2017 20:20:35 +0200
From:   Thomas Sailer <t.sailer@...mni.ethz.ch>
To:     Sudip Mukherjee <sudipm.mukherjee@...il.com>,
        "David S. Miller" <davem@...emloft.net>
Cc:     linux-kernel@...r.kernel.org, linux-hams@...r.kernel.org,
        netdev@...r.kernel.org
Subject: Re: [PATCH] hamradio: baycom: use new parport device model

Acked-By: Thomas Sailer <t.sailer@...mni.ethz.ch>

Am 17.09.2017 um 13:46 schrieb Sudip Mukherjee:
> Modify baycom driver to use the new parallel port device model.
> 
> Signed-off-by: Sudip Mukherjee <sudipm.mukherjee@...il.com>
> ---
> 
> Not tested on real hardware, only tested on qemu and verified that the
> device is binding to the driver properly in epp_open but then unbinding
> as the device was not found.
> 
>   drivers/net/hamradio/baycom_epp.c | 50 +++++++++++++++++++++++++++++++++++----
>   1 file changed, 46 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/net/hamradio/baycom_epp.c b/drivers/net/hamradio/baycom_epp.c
> index 1503f10..1e62d00 100644
> --- a/drivers/net/hamradio/baycom_epp.c
> +++ b/drivers/net/hamradio/baycom_epp.c
> @@ -840,6 +840,7 @@ static int epp_open(struct net_device *dev)
>   	unsigned char tmp[128];
>   	unsigned char stat;
>   	unsigned long tstart;
> +	struct pardev_cb par_cb;
>   	
>           if (!pp) {
>                   printk(KERN_ERR "%s: parport at 0x%lx unknown\n", bc_drvname, dev->base_addr);
> @@ -859,8 +860,21 @@ static int epp_open(struct net_device *dev)
>                   return -EIO;
>   	}
>   	memset(&bc->modem, 0, sizeof(bc->modem));
> -        bc->pdev = parport_register_device(pp, dev->name, NULL, epp_wakeup,
> -					   NULL, PARPORT_DEV_EXCL, dev);
> +	memset(&par_cb, 0, sizeof(par_cb));
> +	par_cb.wakeup = epp_wakeup;
> +	par_cb.private = (void *)dev;
> +	par_cb.flags = PARPORT_DEV_EXCL;
> +	for (i = 0; i < NR_PORTS; i++)
> +		if (baycom_device[i] == dev)
> +			break;
> +
> +	if (i == NR_PORTS) {
> +		pr_err("%s: no device found\n", bc_drvname);
> +		parport_put_port(pp);
> +		return -ENODEV;
> +	}
> +
> +	bc->pdev = parport_register_dev_model(pp, dev->name, &par_cb, i);
>   	parport_put_port(pp);
>           if (!bc->pdev) {
>                   printk(KERN_ERR "%s: cannot register parport at 0x%lx\n", bc_drvname, pp->base);
> @@ -1185,6 +1199,23 @@ MODULE_LICENSE("GPL");
>   
>   /* --------------------------------------------------------------------- */
>   
> +static int baycom_epp_par_probe(struct pardevice *par_dev)
> +{
> +	struct device_driver *drv = par_dev->dev.driver;
> +	int len = strlen(drv->name);
> +
> +	if (strncmp(par_dev->name, drv->name, len))
> +		return -ENODEV;
> +
> +	return 0;
> +}
> +
> +static struct parport_driver baycom_epp_par_driver = {
> +	.name = "bce",
> +	.probe = baycom_epp_par_probe,
> +	.devmodel = true,
> +};
> +
>   static void __init baycom_epp_dev_setup(struct net_device *dev)
>   {
>   	struct baycom_state *bc = netdev_priv(dev);
> @@ -1204,10 +1235,15 @@ static void __init baycom_epp_dev_setup(struct net_device *dev)
>   
>   static int __init init_baycomepp(void)
>   {
> -	int i, found = 0;
> +	int i, found = 0, ret;
>   	char set_hw = 1;
>   
>   	printk(bc_drvinfo);
> +
> +	ret = parport_register_driver(&baycom_epp_par_driver);
> +	if (ret)
> +		return ret;
> +
>   	/*
>   	 * register net devices
>   	 */
> @@ -1241,7 +1277,12 @@ static int __init init_baycomepp(void)
>   		found++;
>   	}
>   
> -	return found ? 0 : -ENXIO;
> +	if (found == 0) {
> +		parport_unregister_driver(&baycom_epp_par_driver);
> +		return -ENXIO;
> +	}
> +
> +	return 0;
>   }
>   
>   static void __exit cleanup_baycomepp(void)
> @@ -1260,6 +1301,7 @@ static void __exit cleanup_baycomepp(void)
>   				printk(paranoia_str, "cleanup_module");
>   		}
>   	}
> +	parport_unregister_driver(&baycom_epp_par_driver);
>   }
>   
>   module_init(init_baycomepp);
>