baycom_par.c

MIZI Research, Inc.发布的嵌入式Linux内核源码

	}
	__sti();
	hdlcdrv_transmitter(dev, &bc->hdrv);
	hdlcdrv_receiver(dev, &bc->hdrv);
        __cli();
}

/* --------------------------------------------------------------------- */

static void par96_wakeup(void *handle)
{
        struct net_device *dev = (struct net_device *)handle;
	struct baycom_state *bc = (struct baycom_state *)dev->priv;

	printk(KERN_DEBUG "baycom_par: %s: why am I being woken up?\n", dev->name);
	if (!parport_claim(bc->pdev))
		printk(KERN_DEBUG "baycom_par: %s: I'm broken.\n", dev->name);
}

/* --------------------------------------------------------------------- */

static int par96_open(struct net_device *dev)
{
	struct baycom_state *bc = (struct baycom_state *)dev->priv;
	struct parport *pp = parport_enumerate();

	if (!dev || !bc)
		return -ENXIO;
	while (pp && pp->base != dev->base_addr) 
		pp = pp->next;
	if (!pp) {
		printk(KERN_ERR "baycom_par: parport at 0x%lx unknown\n", dev->base_addr);
		return -ENXIO;
	}
	if (pp->irq < 0) {
		printk(KERN_ERR "baycom_par: parport at 0x%lx has no irq\n", pp->base);
		return -ENXIO;
	}
	if ((~pp->modes) & (PARPORT_MODE_PCSPP | PARPORT_MODE_SAFEININT)) {
		printk(KERN_ERR "baycom_par: parport at 0x%lx cannot be used\n", pp->base);
		return -ENXIO;
	}
	memset(&bc->modem, 0, sizeof(bc->modem));
	bc->hdrv.par.bitrate = 9600;
	if (!(bc->pdev = parport_register_device(pp, dev->name, NULL, par96_wakeup, 
						 par96_interrupt, PARPORT_DEV_EXCL, dev))) {
		printk(KERN_ERR "baycom_par: cannot register parport at 0x%lx\n", pp->base);
		return -ENXIO;
	}
	if (parport_claim(bc->pdev)) {
		printk(KERN_ERR "baycom_par: parport at 0x%lx busy\n", pp->base);
		parport_unregister_device(bc->pdev);
		return -EBUSY;
	}
	pp = bc->pdev->port;
	dev->irq = pp->irq;
	pp->ops->data_forward(pp);
        bc->hdrv.par.bitrate = 9600;
	pp->ops->write_data(pp, PAR96_PTT | PAR97_POWER); /* switch off PTT */
	pp->ops->enable_irq(pp);
	printk(KERN_INFO "%s: par96 at iobase 0x%lx irq %u options 0x%x\n",
	       bc_drvname, dev->base_addr, dev->irq, bc->options);
	MOD_INC_USE_COUNT;
	return 0;
}

/* --------------------------------------------------------------------- */

static int par96_close(struct net_device *dev)
{
	struct baycom_state *bc = (struct baycom_state *)dev->priv;
	struct parport *pp;

	if (!dev || !bc)
		return -EINVAL;
	pp = bc->pdev->port;
	/* disable interrupt */
	pp->ops->disable_irq(pp);
	/* switch off PTT */
	pp->ops->write_data(pp, PAR96_PTT | PAR97_POWER);
	parport_release(bc->pdev);
	parport_unregister_device(bc->pdev);
	printk(KERN_INFO "%s: close par96 at iobase 0x%lx irq %u\n",
	       bc_drvname, dev->base_addr, dev->irq);
	MOD_DEC_USE_COUNT;
	return 0;
}

/* --------------------------------------------------------------------- */
/*
 * ===================== hdlcdrv driver interface =========================
 */

static int baycom_ioctl(struct net_device *dev, struct ifreq *ifr,
			struct hdlcdrv_ioctl *hi, int cmd);

/* --------------------------------------------------------------------- */

static struct hdlcdrv_ops par96_ops = {
	bc_drvname,
	bc_drvinfo,
	par96_open,
	par96_close,
	baycom_ioctl
};

/* --------------------------------------------------------------------- */

static int baycom_setmode(struct baycom_state *bc, const char *modestr)
{
	if (!strncmp(modestr, "picpar", 6))
		bc->options = 0;
	else if (!strncmp(modestr, "par96", 5))
		bc->options = BAYCOM_OPTIONS_SOFTDCD;
	else
		bc->options = !!strchr(modestr, '*');
	return 0;
}

/* --------------------------------------------------------------------- */

static int baycom_ioctl(struct net_device *dev, struct ifreq *ifr,
			struct hdlcdrv_ioctl *hi, int cmd)
{
	struct baycom_state *bc;
	struct baycom_ioctl bi;
	int cmd2;

	if (!dev || !dev->priv ||
	    ((struct baycom_state *)dev->priv)->hdrv.magic != HDLCDRV_MAGIC) {
		printk(KERN_ERR "bc_ioctl: invalid device struct\n");
		return -EINVAL;
	}
	bc = (struct baycom_state *)dev->priv;

	if (cmd != SIOCDEVPRIVATE)
		return -ENOIOCTLCMD;
	if (get_user(cmd2, (int *)ifr->ifr_data))
		return -EFAULT;
	switch (hi->cmd) {
	default:
		break;

	case HDLCDRVCTL_GETMODE:
		strcpy(hi->data.modename, bc->options ? "par96" : "picpar");
		if (copy_to_user(ifr->ifr_data, hi, sizeof(struct hdlcdrv_ioctl)))
			return -EFAULT;
		return 0;

	case HDLCDRVCTL_SETMODE:
		if (netif_running(dev) || !capable(CAP_NET_ADMIN))
			return -EACCES;
		hi->data.modename[sizeof(hi->data.modename)-1] = '\0';
		return baycom_setmode(bc, hi->data.modename);

	case HDLCDRVCTL_MODELIST:
		strcpy(hi->data.modename, "par96,picpar");
		if (copy_to_user(ifr->ifr_data, hi, sizeof(struct hdlcdrv_ioctl)))
			return -EFAULT;
		return 0;

	case HDLCDRVCTL_MODEMPARMASK:
		return HDLCDRV_PARMASK_IOBASE;

	}

	if (copy_from_user(&bi, ifr->ifr_data, sizeof(bi)))
		return -EFAULT;
	switch (bi.cmd) {
	default:
		return -ENOIOCTLCMD;

#ifdef BAYCOM_DEBUG
	case BAYCOMCTL_GETDEBUG:
		bi.data.dbg.debug1 = bc->hdrv.ptt_keyed;
		bi.data.dbg.debug2 = bc->debug_vals.last_intcnt;
		bi.data.dbg.debug3 = bc->debug_vals.last_pllcorr;
		break;
#endif /* BAYCOM_DEBUG */

	}
	if (copy_to_user(ifr->ifr_data, &bi, sizeof(bi)))
		return -EFAULT;
	return 0;

}

/* --------------------------------------------------------------------- */

/*
 * command line settable parameters
 */
static const char *mode[NR_PORTS] = { "picpar", };
static int iobase[NR_PORTS] = { 0x378, };

MODULE_PARM(mode, "1-" __MODULE_STRING(NR_PORTS) "s");
MODULE_PARM_DESC(mode, "baycom operating mode; eg. par96 or picpar");
MODULE_PARM(iobase, "1-" __MODULE_STRING(NR_PORTS) "i");
MODULE_PARM_DESC(iobase, "baycom io base address");

MODULE_AUTHOR("Thomas M. Sailer, [e-mail], [e-mail]");
MODULE_DESCRIPTION("Baycom par96 and picpar amateur radio modem driver");
MODULE_LICENSE("GPL");

/* --------------------------------------------------------------------- */

static int __init init_baycompar(void)
{
	int i, j, found = 0;
	char set_hw = 1;
	struct baycom_state *bc;

	printk(bc_drvinfo);
	/*
	 * register net devices
	 */
	for (i = 0; i < NR_PORTS; i++) {
		struct net_device *dev = baycom_device+i;
		char ifname[IFNAMSIZ];

		sprintf(ifname, "bcp%d", i);
		if (!mode[i])
			set_hw = 0;
		if (!set_hw)
			iobase[i] = 0;
		j = hdlcdrv_register_hdlcdrv(dev, &par96_ops, sizeof(struct baycom_state),
					     ifname, iobase[i], 0, 0);
		if (!j) {
			bc = (struct baycom_state *)dev->priv;
			if (set_hw && baycom_setmode(bc, mode[i]))
				set_hw = 0;
			found++;
		} else {
			printk(KERN_WARNING "%s: cannot register net device\n",
			       bc_drvname);
		}
	}
	if (!found)
		return -ENXIO;
	return 0;
}

static void __exit cleanup_baycompar(void)
{
	int i;

	for(i = 0; i < NR_PORTS; i++) {
		struct net_device *dev = baycom_device+i;
		struct baycom_state *bc = (struct baycom_state *)dev->priv;

		if (bc) {
			if (bc->hdrv.magic != HDLCDRV_MAGIC)
				printk(KERN_ERR "baycom: invalid magic in "
				       "cleanup_module\n");
			else
				hdlcdrv_unregister_hdlcdrv(dev);
		}
	}
}

module_init(init_baycompar);
module_exit(cleanup_baycompar);

/* --------------------------------------------------------------------- */

#ifndef MODULE

/*
 * format: baycom_par=io,mode
 * mode: par96,picpar
 */

static int __init baycom_par_setup(char *str)
{
        static unsigned nr_dev;
	int ints[2];

        if (nr_dev >= NR_PORTS)
                return 0;
        str = get_options(str, 2, ints);
        if (ints[0] < 1)
                return 0;
        mode[nr_dev] = str;
        iobase[nr_dev] = ints[1];
	nr_dev++;
	return 1;
}

__setup("baycom_par=", baycom_par_setup);

#endif /* MODULE */
/* --------------------------------------------------------------------- */