baycom_ser_hdx.c

linux-2.4.29操作系统的源码

static void ser12_interrupt(int irq, void *dev_id, struct pt_regs *regs)
{
	struct net_device *dev = (struct net_device *)dev_id;
	struct baycom_state *bc = (struct baycom_state *)dev->priv;
	unsigned char iir;

	if (!dev || !bc || bc->hdrv.magic != HDLCDRV_MAGIC)
		return;
	/* fast way out */
	if ((iir = inb(IIR(dev->base_addr))) & 1)
		return;
	baycom_int_freq(bc);
	do {
		switch (iir & 6) {
		case 6:
			inb(LSR(dev->base_addr));
			break;
			
		case 4:
			inb(RBR(dev->base_addr));
			break;
			
		case 2:
			/*
			 * check if transmitter active
			 */
			if (hdlcdrv_ptt(&bc->hdrv))
				ser12_tx(dev, bc);
			else {
				ser12_rx(dev, bc);
				bc->modem.arb_divider--;
			}
			outb(0x00, THR(dev->base_addr));
			break;
			
		default:
			inb(MSR(dev->base_addr));
			break;
		}
		iir = inb(IIR(dev->base_addr));
	} while (!(iir & 1));
	if (bc->modem.arb_divider <= 0) {
		bc->modem.arb_divider = SER12_ARB_DIVIDER(bc);
		__sti();
		hdlcdrv_arbitrate(dev, &bc->hdrv);
	}
	__sti();
	hdlcdrv_transmitter(dev, &bc->hdrv);
	hdlcdrv_receiver(dev, &bc->hdrv);
	__cli();
}

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

enum uart { c_uart_unknown, c_uart_8250,
	    c_uart_16450, c_uart_16550, c_uart_16550A};
static const char *uart_str[] = { 
	"unknown", "8250", "16450", "16550", "16550A" 
};

static enum uart ser12_check_uart(unsigned int iobase)
{
	unsigned char b1,b2,b3;
	enum uart u;
	enum uart uart_tab[] =
		{ c_uart_16450, c_uart_unknown, c_uart_16550, c_uart_16550A };

	b1 = inb(MCR(iobase));
	outb(b1 | 0x10, MCR(iobase));	/* loopback mode */
	b2 = inb(MSR(iobase));
	outb(0x1a, MCR(iobase));
	b3 = inb(MSR(iobase)) & 0xf0;
	outb(b1, MCR(iobase));			/* restore old values */
	outb(b2, MSR(iobase));
	if (b3 != 0x90)
		return c_uart_unknown;
	inb(RBR(iobase));
	inb(RBR(iobase));
	outb(0x01, FCR(iobase));		/* enable FIFOs */
	u = uart_tab[(inb(IIR(iobase)) >> 6) & 3];
	if (u == c_uart_16450) {
		outb(0x5a, SCR(iobase));
		b1 = inb(SCR(iobase));
		outb(0xa5, SCR(iobase));
		b2 = inb(SCR(iobase));
		if ((b1 != 0x5a) || (b2 != 0xa5))
			u = c_uart_8250;
	}
	return u;
}

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

static int ser12_open(struct net_device *dev)
{
	struct baycom_state *bc = (struct baycom_state *)dev->priv;
	enum uart u;

	if (!dev || !bc)
		return -ENXIO;
	if (!dev->base_addr || dev->base_addr > 0x1000-SER12_EXTENT ||
	    dev->irq < 2 || dev->irq > 15)
		return -ENXIO;
	if (check_region(dev->base_addr, SER12_EXTENT))
		return -EACCES;
	memset(&bc->modem, 0, sizeof(bc->modem));
	bc->hdrv.par.bitrate = 1200;
	if ((u = ser12_check_uart(dev->base_addr)) == c_uart_unknown)
		return -EIO;
	outb(0, FCR(dev->base_addr));  /* disable FIFOs */
	outb(0x0d, MCR(dev->base_addr));
	outb(0, IER(dev->base_addr));
	if (request_irq(dev->irq, ser12_interrupt, SA_INTERRUPT | SA_SHIRQ,
			"baycom_ser12", dev))
		return -EBUSY;
	request_region(dev->base_addr, SER12_EXTENT, "baycom_ser12");
	/*
	 * enable transmitter empty interrupt
	 */
	outb(2, IER(dev->base_addr));
	/*
	 * set the SIO to 6 Bits/character and 19200 or 28800 baud, so that
	 * we get exactly (hopefully) 2 or 3 interrupts per radio symbol,
	 * depending on the usage of the software DCD routine
	 */
	ser12_set_divisor(dev, bc->opt_dcd ? 6 : 4);
	printk(KERN_INFO "%s: ser12 at iobase 0x%lx irq %u uart %s\n", 
	       bc_drvname, dev->base_addr, dev->irq, uart_str[u]);
	MOD_INC_USE_COUNT;
	return 0;
}

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

static int ser12_close(struct net_device *dev)
{
	struct baycom_state *bc = (struct baycom_state *)dev->priv;

	if (!dev || !bc)
		return -EINVAL;
	/*
	 * disable interrupts
	 */
	outb(0, IER(dev->base_addr));
	outb(1, MCR(dev->base_addr));
	free_irq(dev->irq, dev);
	release_region(dev->base_addr, SER12_EXTENT);
	printk(KERN_INFO "%s: close ser12 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 ser12_ops = {
	bc_drvname,
	bc_drvinfo,
	ser12_open,
	ser12_close,
	baycom_ioctl
};

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

static int baycom_setmode(struct baycom_state *bc, const char *modestr)
{
	if (strchr(modestr, '*'))
		bc->opt_dcd = 0;
	else if (strchr(modestr, '+'))
		bc->opt_dcd = -1;
	else if (strchr(modestr, '@'))
		bc->opt_dcd = -2;
	else
		bc->opt_dcd = 1;
	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, "ser12");
		if (bc->opt_dcd <= 0)
			strcat(hi->data.modename, (!bc->opt_dcd) ? "*" : (bc->opt_dcd == -2) ? "@" : "+");
		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, "ser12");
		if (copy_to_user(ifr->ifr_data, hi, sizeof(struct hdlcdrv_ioctl)))
			return -EFAULT;
		return 0;

	case HDLCDRVCTL_MODEMPARMASK:
		return HDLCDRV_PARMASK_IOBASE | HDLCDRV_PARMASK_IRQ;

	}

	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 char *mode[NR_PORTS] = { "ser12*", };
static int iobase[NR_PORTS] = { 0x3f8, };
static int irq[NR_PORTS] = { 4, };

MODULE_PARM(mode, "1-" __MODULE_STRING(NR_PORTS) "s");
MODULE_PARM_DESC(mode, "baycom operating mode; * for software DCD");
MODULE_PARM(iobase, "1-" __MODULE_STRING(NR_PORTS) "i");
MODULE_PARM_DESC(iobase, "baycom io base address");
MODULE_PARM(irq, "1-" __MODULE_STRING(NR_PORTS) "i");
MODULE_PARM_DESC(irq, "baycom irq number");

MODULE_AUTHOR("Thomas M. Sailer, [e-mail], [e-mail]");
MODULE_DESCRIPTION("Baycom ser12 half duplex amateur radio modem driver");
MODULE_LICENSE("GPL");

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

static int __init init_baycomserhdx(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, "bcsh%d", i);
		if (!mode[i])
			set_hw = 0;
		if (!set_hw)
			iobase[i] = irq[i] = 0;
		j = hdlcdrv_register_hdlcdrv(dev, &ser12_ops, sizeof(struct baycom_state),
					     ifname, iobase[i], irq[i], 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_baycomserhdx(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_baycomserhdx);
module_exit(cleanup_baycomserhdx);

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

#ifndef MODULE

/*
 * format: baycom_ser_hdx=io,irq,mode
 * mode: ser12    hardware DCD
 *       ser12*   software DCD
 *       ser12@   hardware/software DCD, i.e. no explicit DCD signal but hardware
 *                mutes audio input to the modem
 *       ser12+   hardware DCD, inverted signal at DCD pin
 */

static int __init baycom_ser_hdx_setup(char *str)
{
        static unsigned nr_dev;
	int ints[3];

        if (nr_dev >= NR_PORTS)
                return 0;
	str = get_options(str, 3, ints);
	if (ints[0] < 2)
		return 0;
	mode[nr_dev] = str;
	iobase[nr_dev] = ints[1];
	irq[nr_dev] = ints[2];
	nr_dev++;
	return 1;
}

__setup("baycom_ser_hdx=", baycom_ser_hdx_setup);

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