baycom_par.c

powerpc内核mpc8241linux系统下net驱动程序

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

static void par96_interrupt(int irq, void *dev_id, struct pt_regs *regs)
{
	struct device *dev = (struct device *)dev_id;
	struct baycom_state *bc = (struct baycom_state *)dev->priv;

	if (!dev || !bc || bc->hdrv.magic != HDLCDRV_MAGIC)
		return;

	baycom_int_freq(bc);
	/*
	 * check if transmitter active
	 */
	if (hdlcdrv_ptt(&bc->hdrv))
		par96_tx(dev, bc);
	else {
		par96_rx(dev, bc);
		if (--bc->modem.arb_divider <= 0) {
			bc->modem.arb_divider = 6;
			__sti();
			hdlcdrv_arbitrate(dev, &bc->hdrv);
		}
	}
	__sti();
	hdlcdrv_transmitter(dev, &bc->hdrv);
	hdlcdrv_receiver(dev, &bc->hdrv);
        __cli();
}

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

static void par96_wakeup(void *handle)
{
        struct device *dev = (struct 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 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;
	}
	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;
	}
	dev->irq = pp->irq;
	/* bc->pdev->port->ops->change_mode(bc->pdev->port, PARPORT_MODE_PCSPP);  not yet implemented */
        bc->hdrv.par.bitrate = 9600;
	/* switch off PTT */
	outb(PAR96_PTT | PAR97_POWER, LPT_DATA(dev));
	/*bc->pdev->port->ops->enable_irq(bc->pdev->port);  not yet implemented */
        outb(LPT_IRQ_ENABLE, LPT_CONTROL(dev));	
	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 device *dev)
{
	struct baycom_state *bc = (struct baycom_state *)dev->priv;

	if (!dev || !bc)
		return -EINVAL;
	/* disable interrupt */
        outb(0, LPT_CONTROL(dev));
	/*bc->pdev->port->ops->disable_irq(bc->pdev->port);  not yet implemented */
	/* switch off PTT */
	outb(PAR96_PTT | PAR97_POWER, LPT_DATA(dev));
	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 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 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 (dev->start || !suser())
			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;

}

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

__initfunc(int baycom_par_init(void))
{
	int i, j, found = 0;
	char set_hw = 1;
	struct baycom_state *bc;
	char ifname[HDLCDRV_IFNAMELEN];


	printk(bc_drvinfo);
	/*
	 * register net devices
	 */
	for (i = 0; i < NR_PORTS; i++) {
		struct device *dev = baycom_device+i;
		sprintf(ifname, "bcp%d", i);

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

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

#ifdef MODULE

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

#if LINUX_VERSION_CODE >= 0x20115

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");

#endif

__initfunc(int init_module(void))
{
	int i;

	for (i = 0; (i < NR_PORTS) && (mode[i]); i++) {
		baycom_ports[i].mode = mode[i];
		baycom_ports[i].iobase = iobase[i];
	}
	if (i < NR_PORTS-1)
		baycom_ports[i+1].mode = NULL;
	return baycom_par_init();
}

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

void cleanup_module(void)
{
	int i;

	for(i = 0; i < NR_PORTS; i++) {
		struct 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);
		}
	}
}

#else /* MODULE */
/* --------------------------------------------------------------------- */
/*
 * format: baycom_par=io,mode
 * mode: par96,picpar
 */

__initfunc(void baycom_par_setup(char *str, int *ints))
{
	int i;

	for (i = 0; (i < NR_PORTS) && (baycom_ports[i].mode); i++);
	if ((i >= NR_PORTS) || (ints[0] < 1)) {
		printk(KERN_INFO "%s: too many or invalid interface "
		       "specifications\n", bc_drvname);
		return;
	}
	baycom_ports[i].mode = str;
	baycom_ports[i].iobase = ints[1];
	if (i < NR_PORTS-1)
		baycom_ports[i+1].mode = NULL;
}

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