Re: [RFC] Controller Area Network (CAN) infrastructure

[Greg KH]

On Tue, Jan 24, 2006 at 11:45:56AM +0000, David Vrabel wrote:
> --- /dev/null	1970-01-01 00:00:00.000000000 +0000
> +++ linux-2.6-working/drivers/can/can.c	2006-01-24 11:17:36.000000000 +0000
> @@ -0,0 +1,148 @@
> +/*
> + * Controller Area Network (CAN) infrastructure.
> + *
> + * Copyright (C) 2006 Arcom Control Systems Ltd.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + */
> +#include <linux/types.h>
> +#include <linux/init.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/device.h>
> +#include <linux/netdevice.h>
> +#include <linux/can/can.h>
> +
> +
> +ssize_t can_bit_rate_show(struct class_device *cdev, char *buf)
> +{
> +	struct can_device *can = to_can_device(cdev);
> +	return sprintf(buf, "%d\n", can->get_bit_rate(can));
> +}
> +
> +ssize_t can_bit_rate_store(struct class_device *cdev, const char *buf, size_t count)
> +{
> +	struct can_device *can = to_can_device(cdev);
> +	int bit_rate;
> +
> +	if (netif_running(&can->ndev))
> +		return -EBUSY;
> +
> +	bit_rate = simple_strtoul(buf, NULL, 0);
> +	can->set_bit_rate(can, bit_rate);
> +
> +	return count;
> +}
> +
> +CLASS_DEVICE_ATTR(bit_rate, 0644, can_bit_rate_show, can_bit_rate_store);
> +
> +
> +static struct net_device_stats *can_get_stats(struct net_device *netdev)
> +{
> +	struct can_device *can = netdev->priv;
> +
> +	return &can->stats;
> +}
> +
> +static void can_device_release(struct class_device *cdev)
> +{
> +	struct can_device *can = to_can_device(cdev);
> +
> +	class_device_remove_file(&can->cdev, &class_device_attr_bit_rate);
> +
> +	unregister_netdev(&can->ndev);
> +
> +	kfree(can);
> +}
> +
> +static struct class can_device_class = {
> +	.name     = "can",
> +	.owner   = THIS_MODULE,
> +	.release = can_device_release,
> +};

Can you use class_create() instead of making a static structure?  It
will make it easier for future driver core work.

thanks,

greg k-h
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