baycom_ser_fdx.c

linux-2.6.15.6

	if (!bc->modem.ptt && txcount) {
		hdlcdrv_arbitrate(dev, &bc->hdrv);
		if (hdlcdrv_ptt(&bc->hdrv)) {
			ser12_set_divisor(dev, bc->baud_uartdiv);
			bc->modem.ser12.txshreg = 1;
			bc->modem.ptt = 1;
		}
	}
	hdlcdrv_transmitter(dev, &bc->hdrv);
	hdlcdrv_receiver(dev, &bc->hdrv);
	local_irq_disable();
	return IRQ_HANDLED;
}

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

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 = netdev_priv(dev);
	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 (bc->baud < 300 || bc->baud > 4800)
		return -EINVAL;
	if (!request_region(dev->base_addr, SER12_EXTENT, "baycom_ser_fdx")) {
		printk(KERN_WARNING "BAYCOM_SER_FSX: I/O port 0x%04lx busy \n", 
		       dev->base_addr);
		return -EACCES;
	}
	memset(&bc->modem, 0, sizeof(bc->modem));
	bc->hdrv.par.bitrate = bc->baud;
	bc->baud_us = 1000000/bc->baud;
	bc->baud_uartdiv = (115200/8)/bc->baud;
	if ((u = ser12_check_uart(dev->base_addr)) == c_uart_unknown){
		release_region(dev->base_addr, SER12_EXTENT);
		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_ser_fdx", dev)) {
		release_region(dev->base_addr, SER12_EXTENT);
		return -EBUSY;
	}
	/*
	 * set the SIO to 6 Bits/character; during receive,
	 * the baud rate is set to produce 100 ints/sec
	 * to feed the channel arbitration process,
	 * during transmit to baud ints/sec to run
	 * the transmitter
	 */
	ser12_set_divisor(dev, 115200/100/8);
	/*
	 * enable transmitter empty interrupt and modem status interrupt
	 */
	outb(0x0a, IER(dev->base_addr));
	/*
	 * make sure the next interrupt is generated;
	 * 0 must be used to power the modem; the modem draws its
	 * power from the TxD line
	 */
	outb(0x00, THR(dev->base_addr));
	hdlcdrv_setdcd(&bc->hdrv, 0);
	printk(KERN_INFO "%s: ser_fdx at iobase 0x%lx irq %u baud %u uart %s\n",
	       bc_drvname, dev->base_addr, dev->irq, bc->baud, uart_str[u]);
	return 0;
}

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

static int ser12_close(struct net_device *dev)
{
	struct baycom_state *bc = netdev_priv(dev);

	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 ser_fdx at iobase 0x%lx irq %u\n",
	       bc_drvname, dev->base_addr, dev->irq);
	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 = {
	.drvname = bc_drvname,
	.drvinfo = bc_drvinfo,
	.open    = ser12_open,
	.close   = ser12_close,
	.ioctl   = baycom_ioctl,
};

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

static int baycom_setmode(struct baycom_state *bc, const char *modestr)
{
	unsigned int baud;

	if (!strncmp(modestr, "ser", 3)) {
		baud = simple_strtoul(modestr+3, NULL, 10);
		if (baud >= 3 && baud <= 48)
			bc->baud = baud*100;
	}
	if (strchr(modestr, '*'))
		bc->opt_dcd = 0;
	else if (strchr(modestr, '+'))
		bc->opt_dcd = -1;
	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;

	if (!dev)
		return -EINVAL;

	bc = netdev_priv(dev);
	BUG_ON(bc->hdrv.magic != HDLCDRV_MAGIC);

	if (cmd != SIOCDEVPRIVATE)
		return -ENOIOCTLCMD;
	switch (hi->cmd) {
	default:
		break;

	case HDLCDRVCTL_GETMODE:
		sprintf(hi->data.modename, "ser%u", bc->baud / 100);
		if (bc->opt_dcd <= 0)
			strcat(hi->data.modename, (!bc->opt_dcd) ? "*" : "+");
		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,ser3,ser24");
		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, };
static int baud[NR_PORTS] = { [0 ... NR_PORTS-1] = 1200 };

module_param_array(mode, charp, NULL, 0);
MODULE_PARM_DESC(mode, "baycom operating mode; * for software DCD");
module_param_array(iobase, int, NULL, 0);
MODULE_PARM_DESC(iobase, "baycom io base address");
module_param_array(irq, int, NULL, 0);
MODULE_PARM_DESC(irq, "baycom irq number");
module_param_array(baud, int, NULL, 0);
MODULE_PARM_DESC(baud, "baycom baud rate (300 to 4800)");

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

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

static int __init init_baycomserfdx(void)
{
	int i, found = 0;
	char set_hw = 1;

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

		sprintf(ifname, "bcsf%d", i);

		if (!mode[i])
			set_hw = 0;
		if (!set_hw)
			iobase[i] = irq[i] = 0;

		dev = hdlcdrv_register(&ser12_ops, 
				       sizeof(struct baycom_state),
				       ifname, iobase[i], irq[i], 0);
		if (IS_ERR(dev)) 
			break;

		bc = netdev_priv(dev);
		if (set_hw && baycom_setmode(bc, mode[i]))
			set_hw = 0;
		bc->baud = baud[i];
		found++;
		baycom_device[i] = dev;
	}

	if (!found)
		return -ENXIO;
	return 0;
}

static void __exit cleanup_baycomserfdx(void)
{
	int i;

	for(i = 0; i < NR_PORTS; i++) {
		struct net_device *dev = baycom_device[i];
		if (dev) 
			hdlcdrv_unregister(dev);
	}
}

module_init(init_baycomserfdx);
module_exit(cleanup_baycomserfdx);

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

#ifndef MODULE

/*
 * format: baycom_ser_fdx=io,irq,mode
 * mode: ser#    hardware DCD
 *       ser#*   software DCD
 *       ser#+   hardware DCD, inverted signal at DCD pin
 * '#' denotes the baud rate / 100, eg. ser12* is '1200 baud, soft DCD'
 */

static int __init baycom_ser_fdx_setup(char *str)
{
        static unsigned nr_dev;
        int ints[4];

        if (nr_dev >= NR_PORTS)
                return 0;
        str = get_options(str, 4, ints);
        if (ints[0] < 2)
                return 0;
        mode[nr_dev] = str;
        iobase[nr_dev] = ints[1];
        irq[nr_dev] = ints[2];
	if (ints[0] >= 3)
		baud[nr_dev] = ints[3];
	nr_dev++;
	return 1;
}

__setup("baycom_ser_fdx=", baycom_ser_fdx_setup);

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