patch-2.1.68 linux/drivers/net/baycom_ser_fdx.c

• Lines: 763
• Date: Sun Nov 30 10:30:19 1997
• Orig file: v2.1.67/linux/drivers/net/baycom_ser_fdx.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.1.67/linux/drivers/net/baycom_ser_fdx.c linux/drivers/net/baycom_ser_fdx.c
@@ -0,0 +1,762 @@
+/*****************************************************************************/
+
+/*
+ *	baycom_ser_fdx.c  -- baycom ser12 fullduplex radio modem driver.
+ *
+ *	Copyright (C) 1997  Thomas Sailer (sailer@ife.ee.ethz.ch)
+ *
+ *	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.
+ *
+ *	This program is distributed in the hope that it will be useful,
+ *	but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *	GNU General Public License for more details.
+ *
+ *	You should have received a copy of the GNU General Public License
+ *	along with this program; if not, write to the Free Software
+ *	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ *  Please note that the GPL allows you to use the driver, NOT the radio.
+ *  In order to use the radio, you need a license from the communications
+ *  authority of your country.
+ *
+ *
+ *  Supported modems
+ *
+ *  ser12:  This is a very simple 1200 baud AFSK modem. The modem consists only
+ *          of a modulator/demodulator chip, usually a TI TCM3105. The computer
+ *          is responsible for regenerating the receiver bit clock, as well as
+ *          for handling the HDLC protocol. The modem connects to a serial port,
+ *          hence the name. Since the serial port is not used as an async serial
+ *          port, the kernel driver for serial ports cannot be used, and this
+ *          driver only supports standard serial hardware (8250, 16450, 16550A)
+ *
+ *
+ *  Command line options (insmod command line)
+ *
+ *  mode     * enables software DCD.
+ *  iobase   base address of the port; common values are 0x3f8, 0x2f8, 0x3e8, 0x2e8
+ *  baud     baud rate (between 300 and 4800)
+ *  irq      interrupt line of the port; common values are 4,3
+ *
+ *
+ *  History:
+ *   0.1  26.06.96  Adapted from baycom.c and made network driver interface
+ *        18.10.96  Changed to new user space access routines (copy_{to,from}_user)
+ *   0.3  26.04.97  init code/data tagged
+ *   0.4  08.07.97  alternative ser12 decoding algorithm (uses delta CTS ints)
+ *   0.5  11.11.97  ser12/par96 split into separate files
+ */
+
+/*****************************************************************************/
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/types.h>
+#include <linux/fcntl.h>
+#include <linux/interrupt.h>
+#include <linux/ioport.h>
+#include <linux/in.h>
+#include <linux/string.h>
+#include <asm/system.h>
+#include <asm/bitops.h>
+#include <asm/io.h>
+#include <linux/delay.h>
+#include <linux/errno.h>
+#include <linux/netdevice.h>
+#include <linux/hdlcdrv.h>
+#include <linux/baycom.h>
+
+/* --------------------------------------------------------------------- */
+
+/*
+ * currently this module is supposed to support both module styles, i.e.
+ * the old one present up to about 2.1.9, and the new one functioning
+ * starting with 2.1.21. The reason is I have a kit allowing to compile
+ * this module also under 2.0.x which was requested by several people.
+ * This will go in 2.2
+ */
+#include <linux/version.h>
+
+#if LINUX_VERSION_CODE >= 0x20100
+#include <asm/uaccess.h>
+#else
+#include <asm/segment.h>
+#include <linux/mm.h>
+
+#undef put_user
+#undef get_user
+
+#define put_user(x,ptr) ({ __put_user((unsigned long)(x),(ptr),sizeof(*(ptr))); 0; })
+#define get_user(x,ptr) ({ x = ((__typeof__(*(ptr)))__get_user((ptr),sizeof(*(ptr)))); 0; })
+
+extern inline int copy_from_user(void *to, const void *from, unsigned long n)
+{
+        int i = verify_area(VERIFY_READ, from, n);
+        if (i)
+                return i;
+        memcpy_fromfs(to, from, n);
+        return 0;
+}
+
+extern inline int copy_to_user(void *to, const void *from, unsigned long n)
+{
+        int i = verify_area(VERIFY_WRITE, to, n);
+        if (i)
+                return i;
+        memcpy_tofs(to, from, n);
+        return 0;
+}
+#endif
+
+#if LINUX_VERSION_CODE >= 0x20123
+#include <linux/init.h>
+#else
+#define __init
+#define __initdata
+#define __initfunc(x) x
+#endif
+
+/* --------------------------------------------------------------------- */
+
+#define BAYCOM_DEBUG
+
+/*
+ * modem options; bit mask
+ */
+#define BAYCOM_OPTIONS_SOFTDCD  1
+
+/* --------------------------------------------------------------------- */
+
+static const char bc_drvname[] = "baycom_ser_fdx";
+static const char bc_drvinfo[] = KERN_INFO "baycom_ser_fdx: (C) 1997 Thomas Sailer, HB9JNX/AE4WA\n"
+KERN_INFO "baycom_ser_fdx: version 0.5 compiled " __TIME__ " " __DATE__ "\n";
+
+/* --------------------------------------------------------------------- */
+
+#define NR_PORTS 4
+
+static struct device baycom_device[NR_PORTS];
+
+static struct {
+	char *mode;
+	int iobase, irq, baud;
+} baycom_ports[NR_PORTS] = { { NULL, 0, 0 }, };
+
+/* --------------------------------------------------------------------- */
+
+#define RBR(iobase) (iobase+0)
+#define THR(iobase) (iobase+0)
+#define IER(iobase) (iobase+1)
+#define IIR(iobase) (iobase+2)
+#define FCR(iobase) (iobase+2)
+#define LCR(iobase) (iobase+3)
+#define MCR(iobase) (iobase+4)
+#define LSR(iobase) (iobase+5)
+#define MSR(iobase) (iobase+6)
+#define SCR(iobase) (iobase+7)
+#define DLL(iobase) (iobase+0)
+#define DLM(iobase) (iobase+1)
+
+#define SER12_EXTENT 8
+
+/* ---------------------------------------------------------------------- */
+/*
+ * Information that need to be kept for each board.
+ */
+
+struct baycom_state {
+	struct hdlcdrv_state hdrv;
+
+	unsigned int baud, baud_us8, baud_arbdiv;
+	unsigned int options;
+
+	struct modem_state {
+		short arb_divider;
+		unsigned char flags;
+		unsigned int shreg;
+		struct modem_state_ser12 {
+			unsigned char tx_bit;
+			int dcd_sum0, dcd_sum1, dcd_sum2;
+			unsigned char last_sample;
+			unsigned char last_rxbit;
+			unsigned int dcd_shreg;
+			unsigned int dcd_time;
+			unsigned int bit_pll;
+			unsigned long last_jiffies;
+			unsigned int pll_time;
+			unsigned int txshreg;
+		} ser12;
+	} modem;
+
+#ifdef BAYCOM_DEBUG
+	struct debug_vals {
+		unsigned long last_jiffies;
+		unsigned cur_intcnt;
+		unsigned last_intcnt;
+		int cur_pllcorr;
+		int last_pllcorr;
+	} debug_vals;
+#endif /* BAYCOM_DEBUG */
+};
+
+/* --------------------------------------------------------------------- */
+
+#define min(a, b) (((a) < (b)) ? (a) : (b))
+#define max(a, b) (((a) > (b)) ? (a) : (b))
+
+/* --------------------------------------------------------------------- */
+
+static void inline baycom_int_freq(struct baycom_state *bc)
+{
+#ifdef BAYCOM_DEBUG
+	unsigned long cur_jiffies = jiffies;
+	/*
+	 * measure the interrupt frequency
+	 */
+	bc->debug_vals.cur_intcnt++;
+	if ((cur_jiffies - bc->debug_vals.last_jiffies) >= HZ) {
+		bc->debug_vals.last_jiffies = cur_jiffies;
+		bc->debug_vals.last_intcnt = bc->debug_vals.cur_intcnt;
+		bc->debug_vals.cur_intcnt = 0;
+		bc->debug_vals.last_pllcorr = bc->debug_vals.cur_pllcorr;
+		bc->debug_vals.cur_pllcorr = 0;
+	}
+#endif /* BAYCOM_DEBUG */
+}
+
+/* --------------------------------------------------------------------- */
+/*
+ * ===================== SER12 specific routines =========================
+ */
+
+/* --------------------------------------------------------------------- */
+
+extern inline unsigned int hweight16(unsigned short w)
+        __attribute__ ((unused));
+extern inline unsigned int hweight8(unsigned char w)
+        __attribute__ ((unused));
+
+extern inline unsigned int hweight16(unsigned short w)
+{
+        unsigned short res = (w & 0x5555) + ((w >> 1) & 0x5555);
+        res = (res & 0x3333) + ((res >> 2) & 0x3333);
+        res = (res & 0x0F0F) + ((res >> 4) & 0x0F0F);
+        return (res & 0x00FF) + ((res >> 8) & 0x00FF);
+}
+
+extern inline unsigned int hweight8(unsigned char w)
+{
+        unsigned short res = (w & 0x55) + ((w >> 1) & 0x55);
+        res = (res & 0x33) + ((res >> 2) & 0x33);
+        return (res & 0x0F) + ((res >> 4) & 0x0F);
+}
+
+/* --------------------------------------------------------------------- */
+
+static __inline__ void ser12_rxsample(struct device *dev, struct baycom_state *bc, unsigned char news)
+{
+	bc->modem.ser12.dcd_shreg <<= 1;
+	bc->modem.ser12.bit_pll += 0x2000;
+	if (bc->modem.ser12.last_sample != news) {
+		bc->modem.ser12.last_sample = news;
+		bc->modem.ser12.dcd_shreg |= 1;
+		if (bc->modem.ser12.bit_pll < 0x9000)
+			bc->modem.ser12.bit_pll += 0x1000;
+		else
+			bc->modem.ser12.bit_pll -= 0x1000;
+		bc->modem.ser12.dcd_sum0 += 4 * hweight8(bc->modem.ser12.dcd_shreg & 0x38)
+			- hweight16(bc->modem.ser12.dcd_shreg & 0x7c0);
+	}
+	hdlcdrv_channelbit(&bc->hdrv, !!bc->modem.ser12.last_sample);
+	if ((--bc->modem.ser12.dcd_time) <= 0) {
+		hdlcdrv_setdcd(&bc->hdrv, (bc->modem.ser12.dcd_sum0 + 
+					   bc->modem.ser12.dcd_sum1 + 
+					   bc->modem.ser12.dcd_sum2) < 0);
+		bc->modem.ser12.dcd_sum2 = bc->modem.ser12.dcd_sum1;
+		bc->modem.ser12.dcd_sum1 = bc->modem.ser12.dcd_sum0;
+		bc->modem.ser12.dcd_sum0 = 2; /* slight bias */
+		bc->modem.ser12.dcd_time = 120;
+	}
+	if (bc->modem.ser12.bit_pll >= 0x10000) {
+		bc->modem.ser12.bit_pll &= 0xffff;
+		bc->modem.shreg >>= 1;
+		if (bc->modem.ser12.last_rxbit == bc->modem.ser12.last_sample)
+			bc->modem.shreg |=  0x10000;
+		bc->modem.ser12.last_rxbit = bc->modem.ser12.last_sample;
+		if (bc->modem.shreg & 1) {
+			hdlcdrv_putbits(&bc->hdrv, bc->modem.shreg >> 1);
+			bc->modem.shreg = 0x10000;
+		}
+	}
+}
+
+/* --------------------------------------------------------------------- */
+
+static __inline__ void ser12_rx(struct device *dev, struct baycom_state *bc, unsigned char curs)
+{
+	unsigned long curjiff;
+	struct timeval tv;
+	unsigned int timediff;
+
+	/*
+	 * get current time
+	 */
+	curjiff = jiffies;
+	do_gettimeofday(&tv);
+	if ((signed)(curjiff - bc->modem.ser12.last_jiffies) >= HZ/4) {
+		/* long inactivity; clear HDLC and DCD */
+		bc->modem.ser12.dcd_sum1 = 0;
+		bc->modem.ser12.dcd_sum2 = 0;
+		bc->modem.ser12.dcd_sum0 = 2;
+		bc->modem.ser12.dcd_time = 120;
+		hdlcdrv_setdcd(&bc->hdrv, 0);
+		hdlcdrv_putbits(&bc->hdrv, 0xffff);
+		bc->modem.ser12.last_jiffies = curjiff;
+		bc->modem.ser12.pll_time = tv.tv_usec;
+	}
+	bc->modem.ser12.last_jiffies = curjiff;
+	timediff = tv.tv_usec + 1000000 - bc->modem.ser12.pll_time;
+	timediff %= 1000000;
+	timediff /= bc->baud_us8;
+	bc->modem.ser12.pll_time = (bc->modem.ser12.pll_time + timediff * (bc->baud_us8)) % 1000000;
+	for (; timediff > 1; timediff--)
+		ser12_rxsample(dev, bc, bc->modem.ser12.last_sample);
+	if (timediff >= 1)
+		ser12_rxsample(dev, bc, curs);
+}
+
+/* --------------------------------------------------------------------- */
+
+static void ser12_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;
+	unsigned char iir, msr = 0;
+	unsigned int txcount = 0;
+	unsigned int rxcount = 0;
+
+	if (!dev || !bc || bc->hdrv.magic != HDLCDRV_MAGIC)
+		return;
+	
+	for (;;) {
+		iir = inb(IIR(dev->base_addr));
+		if (iir & 1)
+			break;
+		switch (iir & 6) {
+		case 6:
+			inb(LSR(dev->base_addr));
+			continue;
+			
+		case 4:
+			inb(RBR(dev->base_addr));
+			continue;
+			
+		case 2:
+			/*
+			 * 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));
+			bc->modem.arb_divider--;
+			baycom_int_freq(bc);
+			if (hdlcdrv_ptt(&bc->hdrv)) {
+				/*
+				 * first output the last bit (!) then call HDLC transmitter,
+				 * since this may take quite long
+				 */
+				outb(0x0e | (!!bc->modem.ser12.tx_bit), MCR(dev->base_addr));
+				txcount++;
+			} else
+				outb(0x0d, MCR(dev->base_addr));       /* transmitter off */
+			continue;
+			
+		default:
+			msr = inb(MSR(dev->base_addr));
+			if (msr & 1)  /* delta CTS interrupt */
+				rxcount++;
+			continue;
+		}
+	}
+	if (rxcount)
+		ser12_rx(dev, bc, msr & 0x10);
+	if (txcount) {
+#ifdef BAYCOM_DEBUG
+		if (bc->debug_vals.cur_pllcorr < txcount)
+			bc->debug_vals.cur_pllcorr = txcount;
+#endif /* BAYCOM_DEBUG */
+		if (bc->modem.ser12.txshreg <= 1)
+			bc->modem.ser12.txshreg = 0x10000 | hdlcdrv_getbits(&bc->hdrv);
+		bc->modem.ser12.tx_bit = !(bc->modem.ser12.tx_bit ^ (bc->modem.ser12.txshreg & 1));
+		bc->modem.ser12.txshreg >>= 1;
+	}
+	sti();
+	if (bc->modem.arb_divider <= 0) {
+		bc->modem.arb_divider = bc->baud_arbdiv;
+		hdlcdrv_arbitrate(dev, &bc->hdrv);
+	}
+	hdlcdrv_transmitter(dev, &bc->hdrv);
+	hdlcdrv_receiver(dev, &bc->hdrv);
+}
+
+/* --------------------------------------------------------------------- */
+
+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 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 (bc->baud < 300 || bc->baud > 4800)
+		return -EINVAL;
+	if (check_region(dev->base_addr, SER12_EXTENT))
+		return -EACCES;
+	memset(&bc->modem, 0, sizeof(bc->modem));
+	bc->hdrv.par.bitrate = bc->baud;
+	bc->baud_us8 = 125000/bc->baud;
+	bc->baud_arbdiv = bc->baud/100;
+	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(0x0d, MCR(dev->base_addr));
+	outb(0, IER(dev->base_addr));
+	if (request_irq(dev->irq, ser12_interrupt, SA_INTERRUPT,
+			"baycom_ser_fdx", dev))
+		return -EBUSY;
+	request_region(dev->base_addr, SER12_EXTENT, "baycom_ser_fdx");
+	/*
+	 * set the SIO to 6 Bits/character and 19600 baud, so that
+	 * we get exactly (hopefully) one interrupt per radio symbol
+	 */
+	outb(0x81, LCR(dev->base_addr));	/* DLAB = 1 */
+	outb(115200/8/bc->baud, DLL(dev->base_addr));
+	outb(0, DLM(dev->base_addr));
+	outb(0x01, LCR(dev->base_addr));	/* word length = 6 */
+	/*
+	 * 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));
+	printk(KERN_INFO "%s: ser_fdx at iobase 0x%lx irq %u options "
+	       "0x%x baud %u uart %s\n", bc_drvname, dev->base_addr, dev->irq,
+	       bc->options, bc->baud, uart_str[u]);
+	MOD_INC_USE_COUNT;
+	return 0;
+}
+
+/* --------------------------------------------------------------------- */
+
+static int ser12_close(struct 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 ser_fdx 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 ser12_ops = {
+	bc_drvname,
+	bc_drvinfo,
+	ser12_open,
+	ser12_close,
+	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;
+	}
+	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:
+		sprintf(hi->data.modename, "ser%u", bc->baud / 100);
+		if (bc->options & 1)
+			strcat(hi->data.modename, "*");
+		if (copy_to_user(ifr->ifr_data, hi, sizeof(struct hdlcdrv_ioctl)))
+			return -EFAULT;
+		return 0;
+
+	case HDLCDRVCTL_SETMODE:
+		if (!suser() || dev->start)
+			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;
+
+}
+
+/* --------------------------------------------------------------------- */
+
+__initfunc(int baycom_ser_fdx_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, "bcsf%d", i);
+
+		if (!baycom_ports[i].mode)
+			set_hw = 0;
+		if (!set_hw)
+			baycom_ports[i].iobase = baycom_ports[i].irq = 0;
+		j = hdlcdrv_register_hdlcdrv(dev, &ser12_ops,
+					     sizeof(struct baycom_state),
+					     ifname, baycom_ports[i].iobase,
+					     baycom_ports[i].irq, 0);
+		if (!j) {
+			bc = (struct baycom_state *)dev->priv;
+			if (set_hw && baycom_setmode(bc, baycom_ports[i].mode))
+				set_hw = 0;
+			bc->baud = baycom_ports[i].baud;
+			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 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 };
+
+#if LINUX_VERSION_CODE >= 0x20115
+
+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_PARM(baud, "1-" __MODULE_STRING(NR_PORTS) "i");
+MODULE_PARM_DESC(baud, "baycom baud rate (300 to 4800)");
+
+MODULE_AUTHOR("Thomas M. Sailer, sailer@ife.ee.ethz.ch, hb9jnx@hb9w.che.eu");
+MODULE_DESCRIPTION("Baycom ser12 full duplex 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];
+		baycom_ports[i].irq = irq[i];
+		baycom_ports[i].baud = baud[i];
+	}
+	if (i < NR_PORTS-1)
+		baycom_ports[i+1].mode = NULL;
+	return baycom_ser_fdx_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_ser_=io,irq,mode
+ * mode: [*]
+ * * indicates sofware DCD
+ */
+
+__initfunc(void baycom_ser_fdx_setup(char *str, int *ints))
+{
+	int i;
+
+	for (i = 0; (i < NR_PORTS) && (baycom_ports[i].mode); i++);
+	if ((i >= NR_PORTS) || (ints[0] < 2)) {
+		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];
+	baycom_ports[i].irq = ints[2];
+	if (ints[0] >= 3)
+		baycom_ports[i].baud = ints[3];
+	else
+		baycom_ports[i].baud = 1200;
+	if (i < NR_PORTS-1)
+		baycom_ports[i+1].mode = NULL;
+}
+
+#endif /* MODULE */
+/* --------------------------------------------------------------------- */