patch-2.1.105 linux/drivers/net/hamradio/baycom_epp.c

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diff -u --recursive --new-file v2.1.104/linux/drivers/net/hamradio/baycom_epp.c linux/drivers/net/hamradio/baycom_epp.c
@@ -0,0 +1,1556 @@
+/*****************************************************************************/
+
+/*
+ *	baycom_epp.c  -- baycom epp radio modem driver.
+ *
+ *	Copyright (C) 1998
+ *          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.
+ *
+ *
+ *  History:
+ *   0.1  xx.xx.98  Initial version by Matthias Welwarsky (dg2fef)
+ *   0.2  21.04.98  Massive rework by Thomas Sailer
+ *                  Integrated FPGA EPP modem configuration routines
+ *   0.3  11.05.98  Took FPGA config out and moved it into a separate program
+ *
+ */
+
+/*****************************************************************************/
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/ptrace.h>
+#include <linux/socket.h>
+#include <linux/sched.h>
+#include <linux/interrupt.h>
+#include <linux/ioport.h>
+#include <linux/in.h>
+#include <linux/string.h>
+#include <linux/parport.h>
+#include <linux/bitops.h>
+#include <linux/sched.h>
+#include <asm/system.h>
+#include <asm/io.h>
+#include <asm/processor.h>
+#include <linux/delay.h>
+#include <linux/errno.h>
+#include <linux/netdevice.h>
+#include <linux/if_arp.h>
+//#include <net/ax25dev.h>
+#include <linux/kmod.h>
+#include <linux/hdlcdrv.h>
+#include <linux/baycom.h>
+#include <linux/soundmodem.h>
+#if defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE)
+/* prototypes for ax25_encapsulate and ax25_rebuild_header */
+#include <net/ax25.h> 
+#endif /* CONFIG_AX25 || CONFIG_AX25_MODULE */
+
+#define __KERNEL_SYSCALLS__
+#include <linux/unistd.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
+#define BAYCOM_MAGIC 19730510
+
+/* --------------------------------------------------------------------- */
+
+static const char paranoia_str[] = KERN_ERR 
+"baycom_epp: bad magic number for hdlcdrv_state struct in routine %s\n";
+
+#define baycom_paranoia_check(dev,routine,retval)                                              \
+({                                                                                             \
+	if (!dev || !dev->priv || ((struct baycom_state *)dev->priv)->magic != BAYCOM_MAGIC) { \
+		printk(paranoia_str, routine);                                                 \
+		return retval;                                                                 \
+	}                                                                                      \
+})
+
+#define baycom_paranoia_check_void(dev,routine)                                                \
+({                                                                                             \
+	if (!dev || !dev->priv || ((struct baycom_state *)dev->priv)->magic != BAYCOM_MAGIC) { \
+		printk(paranoia_str, routine);                                                 \
+		return;                                                                        \
+	}                                                                                      \
+})
+
+/* --------------------------------------------------------------------- */
+
+static const char bc_drvname[] = "baycom_epp";
+static const char bc_drvinfo[] = KERN_INFO "baycom_epp: (C) 1998 Thomas Sailer, HB9JNX/AE4WA\n"
+KERN_INFO "baycom_epp: version 0.3 compiled " __TIME__ " " __DATE__ "\n";
+
+/* --------------------------------------------------------------------- */
+
+#define NR_PORTS 4
+
+static struct device baycom_device[NR_PORTS];
+
+static struct {
+	const char *mode;
+	int iobase;
+} baycom_ports[NR_PORTS] = { { NULL, 0 }, };
+
+/* --------------------------------------------------------------------- */
+
+/* EPP status register */
+#define EPP_DCDBIT      0x80
+#define EPP_PTTBIT      0x08
+#define EPP_NREF        0x01
+#define EPP_NRAEF       0x02
+#define EPP_NRHF        0x04
+#define EPP_NTHF        0x20
+#define EPP_NTAEF       0x10
+#define EPP_NTEF        EPP_PTTBIT
+
+/* EPP control register */
+#define EPP_TX_FIFO_ENABLE 0x10
+#define EPP_RX_FIFO_ENABLE 0x08
+#define EPP_MODEM_ENABLE   0x20
+#define EPP_LEDS           0xC0
+#define EPP_IRQ_ENABLE     0x10
+
+/* LPT registers */
+#define LPTREG_ECONTROL       0x402
+#define LPTREG_CONFIGB        0x401
+#define LPTREG_CONFIGA        0x400
+#define LPTREG_EPPDATA        0x004
+#define LPTREG_EPPADDR        0x003
+#define LPTREG_CONTROL        0x002
+#define LPTREG_STATUS         0x001
+#define LPTREG_DATA           0x000
+
+/* LPT control register */
+#define LPTCTRL_PROGRAM       0x04   /* 0 to reprogram */
+#define LPTCTRL_WRITE         0x01
+#define LPTCTRL_ADDRSTB       0x08
+#define LPTCTRL_DATASTB       0x02
+#define LPTCTRL_INTEN         0x10
+
+/* LPT status register */
+#define LPTSTAT_SHIFT_NINTR   6
+#define LPTSTAT_WAIT          0x80
+#define LPTSTAT_NINTR         (1<<LPTSTAT_SHIFT_NINTR)
+#define LPTSTAT_PE            0x20
+#define LPTSTAT_DONE          0x10
+#define LPTSTAT_NERROR        0x08
+#define LPTSTAT_EPPTIMEOUT    0x01
+
+/* LPT data register */
+#define LPTDATA_SHIFT_TDI     0
+#define LPTDATA_SHIFT_TMS     2
+#define LPTDATA_TDI           (1<<LPTDATA_SHIFT_TDI)
+#define LPTDATA_TCK           0x02
+#define LPTDATA_TMS           (1<<LPTDATA_SHIFT_TMS)
+#define LPTDATA_INITBIAS      0x80
+
+
+/* EPP modem config/status bits */
+#define EPP_DCDBIT            0x80
+#define EPP_PTTBIT            0x08
+#define EPP_RXEBIT            0x01
+#define EPP_RXAEBIT           0x02
+#define EPP_RXHFULL           0x04
+
+#define EPP_NTHF              0x20
+#define EPP_NTAEF             0x10
+#define EPP_NTEF              EPP_PTTBIT
+
+#define EPP_TX_FIFO_ENABLE    0x10
+#define EPP_RX_FIFO_ENABLE    0x08
+#define EPP_MODEM_ENABLE      0x20
+#define EPP_LEDS              0xC0
+#define EPP_IRQ_ENABLE        0x10
+
+/* Xilinx 4k JTAG instructions */
+#define XC4K_IRLENGTH   3
+#define XC4K_EXTEST     0
+#define XC4K_PRELOAD    1
+#define XC4K_CONFIGURE  5
+#define XC4K_BYPASS     7
+
+#define EPP_CONVENTIONAL  0
+#define EPP_FPGA          1
+#define EPP_FPGAEXTSTATUS 2
+
+#define TXBUFFER_SIZE     ((HDLCDRV_MAXFLEN*6/5)+8)
+
+/* ---------------------------------------------------------------------- */
+/*
+ * Information that need to be kept for each board.
+ */
+
+struct baycom_state {
+	int magic;
+
+        struct pardevice *pdev;
+	unsigned int bh_running;
+	struct tq_struct run_bh;
+	unsigned int modem;
+	unsigned int bitrate;
+	unsigned char stat;
+
+	char ifname[HDLCDRV_IFNAMELEN];
+
+	struct {
+		unsigned int intclk;
+		unsigned int divider;
+		unsigned int extmodem;
+		unsigned int loopback;
+	} cfg;
+
+        struct hdlcdrv_channel_params ch_params;
+
+        struct {
+		unsigned int bitbuf, bitstream, numbits, state;
+		unsigned char *bufptr;
+		int bufcnt;
+		unsigned char buf[TXBUFFER_SIZE];
+        } hdlcrx;
+
+        struct {
+		int calibrate;
+                int slotcnt;
+		int flags;
+		enum { tx_idle = 0, tx_keyup, tx_data, tx_tail } state;
+		unsigned char *bufptr;
+		int bufcnt;
+		unsigned char buf[TXBUFFER_SIZE];
+        } hdlctx;
+
+        struct net_device_stats stats;
+	unsigned int ptt_keyed;
+        struct sk_buff_head send_queue;  /* Packets awaiting transmission */
+
+
+#ifdef BAYCOM_DEBUG
+	struct debug_vals {
+		unsigned long last_jiffies;
+		unsigned cur_intcnt;
+		unsigned last_intcnt;
+		int cur_pllcorr;
+		int last_pllcorr;
+		unsigned int mod_cycles;
+		unsigned int demod_cycles;
+	} debug_vals;
+#endif /* BAYCOM_DEBUG */
+};
+
+/* --------------------------------------------------------------------- */
+
+#define min(a, b) (((a) < (b)) ? (a) : (b))
+#define max(a, b) (((a) > (b)) ? (a) : (b))
+
+/* --------------------------------------------------------------------- */
+
+#define KISS_VERBOSE
+
+/* --------------------------------------------------------------------- */
+
+#define PARAM_TXDELAY   1
+#define PARAM_PERSIST   2
+#define PARAM_SLOTTIME  3
+#define PARAM_TXTAIL    4
+#define PARAM_FULLDUP   5
+#define PARAM_HARDWARE  6
+#define PARAM_RETURN    255
+
+/* --------------------------------------------------------------------- */
+/*
+ * the CRC routines are stolen from WAMPES
+ * by Dieter Deyke
+ */
+
+static const unsigned short crc_ccitt_table[] = {
+	0x0000, 0x1189, 0x2312, 0x329b, 0x4624, 0x57ad, 0x6536, 0x74bf,
+	0x8c48, 0x9dc1, 0xaf5a, 0xbed3, 0xca6c, 0xdbe5, 0xe97e, 0xf8f7,
+	0x1081, 0x0108, 0x3393, 0x221a, 0x56a5, 0x472c, 0x75b7, 0x643e,
+	0x9cc9, 0x8d40, 0xbfdb, 0xae52, 0xdaed, 0xcb64, 0xf9ff, 0xe876,
+	0x2102, 0x308b, 0x0210, 0x1399, 0x6726, 0x76af, 0x4434, 0x55bd,
+	0xad4a, 0xbcc3, 0x8e58, 0x9fd1, 0xeb6e, 0xfae7, 0xc87c, 0xd9f5,
+	0x3183, 0x200a, 0x1291, 0x0318, 0x77a7, 0x662e, 0x54b5, 0x453c,
+	0xbdcb, 0xac42, 0x9ed9, 0x8f50, 0xfbef, 0xea66, 0xd8fd, 0xc974,
+	0x4204, 0x538d, 0x6116, 0x709f, 0x0420, 0x15a9, 0x2732, 0x36bb,
+	0xce4c, 0xdfc5, 0xed5e, 0xfcd7, 0x8868, 0x99e1, 0xab7a, 0xbaf3,
+	0x5285, 0x430c, 0x7197, 0x601e, 0x14a1, 0x0528, 0x37b3, 0x263a,
+	0xdecd, 0xcf44, 0xfddf, 0xec56, 0x98e9, 0x8960, 0xbbfb, 0xaa72,
+	0x6306, 0x728f, 0x4014, 0x519d, 0x2522, 0x34ab, 0x0630, 0x17b9,
+	0xef4e, 0xfec7, 0xcc5c, 0xddd5, 0xa96a, 0xb8e3, 0x8a78, 0x9bf1,
+	0x7387, 0x620e, 0x5095, 0x411c, 0x35a3, 0x242a, 0x16b1, 0x0738,
+	0xffcf, 0xee46, 0xdcdd, 0xcd54, 0xb9eb, 0xa862, 0x9af9, 0x8b70,
+	0x8408, 0x9581, 0xa71a, 0xb693, 0xc22c, 0xd3a5, 0xe13e, 0xf0b7,
+	0x0840, 0x19c9, 0x2b52, 0x3adb, 0x4e64, 0x5fed, 0x6d76, 0x7cff,
+	0x9489, 0x8500, 0xb79b, 0xa612, 0xd2ad, 0xc324, 0xf1bf, 0xe036,
+	0x18c1, 0x0948, 0x3bd3, 0x2a5a, 0x5ee5, 0x4f6c, 0x7df7, 0x6c7e,
+	0xa50a, 0xb483, 0x8618, 0x9791, 0xe32e, 0xf2a7, 0xc03c, 0xd1b5,
+	0x2942, 0x38cb, 0x0a50, 0x1bd9, 0x6f66, 0x7eef, 0x4c74, 0x5dfd,
+	0xb58b, 0xa402, 0x9699, 0x8710, 0xf3af, 0xe226, 0xd0bd, 0xc134,
+	0x39c3, 0x284a, 0x1ad1, 0x0b58, 0x7fe7, 0x6e6e, 0x5cf5, 0x4d7c,
+	0xc60c, 0xd785, 0xe51e, 0xf497, 0x8028, 0x91a1, 0xa33a, 0xb2b3,
+	0x4a44, 0x5bcd, 0x6956, 0x78df, 0x0c60, 0x1de9, 0x2f72, 0x3efb,
+	0xd68d, 0xc704, 0xf59f, 0xe416, 0x90a9, 0x8120, 0xb3bb, 0xa232,
+	0x5ac5, 0x4b4c, 0x79d7, 0x685e, 0x1ce1, 0x0d68, 0x3ff3, 0x2e7a,
+	0xe70e, 0xf687, 0xc41c, 0xd595, 0xa12a, 0xb0a3, 0x8238, 0x93b1,
+	0x6b46, 0x7acf, 0x4854, 0x59dd, 0x2d62, 0x3ceb, 0x0e70, 0x1ff9,
+	0xf78f, 0xe606, 0xd49d, 0xc514, 0xb1ab, 0xa022, 0x92b9, 0x8330,
+	0x7bc7, 0x6a4e, 0x58d5, 0x495c, 0x3de3, 0x2c6a, 0x1ef1, 0x0f78
+};
+
+/*---------------------------------------------------------------------------*/
+
+#if 0
+extern inline void append_crc_ccitt(unsigned char *buffer, int len)
+{
+ 	unsigned int crc = 0xffff;
+
+	for (;len>0;len--)
+		crc = (crc >> 8) ^ crc_ccitt_table[(crc ^ *buffer++) & 0xff];
+	crc ^= 0xffff;
+	*buffer++ = crc;
+	*buffer++ = crc >> 8;
+}
+#endif
+
+/*---------------------------------------------------------------------------*/
+
+extern inline int check_crc_ccitt(const unsigned char *buf, int cnt)
+{
+	unsigned int crc = 0xffff;
+
+	for (; cnt > 0; cnt--)
+		crc = (crc >> 8) ^ crc_ccitt_table[(crc ^ *buf++) & 0xff];
+	return (crc & 0xffff) == 0xf0b8;
+}
+
+/*---------------------------------------------------------------------------*/
+
+extern inline int calc_crc_ccitt(const unsigned char *buf, int cnt)
+{
+	unsigned int crc = 0xffff;
+
+	for (; cnt > 0; cnt--)
+		crc = (crc >> 8) ^ crc_ccitt_table[(crc ^ *buf++) & 0xff];
+	crc ^= 0xffff;
+	return (crc & 0xffff);
+}
+
+/* ---------------------------------------------------------------------- */
+
+#define tenms_to_flags(bc,tenms) ((tenms * bc->bitrate) / 800)
+
+/* --------------------------------------------------------------------- */
+
+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 */
+}
+
+/* ---------------------------------------------------------------------- */
+/*
+ *    eppconfig_path should be setable  via /proc/sys.
+ */
+
+char eppconfig_path[256] = "/sbin/eppfpga";
+
+static char *envp[] = { "HOME=/", "TERM=linux", "PATH=/usr/bin:/bin", NULL };
+
+static int errno;
+
+static int exec_eppfpga(void *b)
+{
+	struct baycom_state *bc = (struct baycom_state *)b;
+	char modearg[256];
+	char portarg[16];
+        char *argv[] = { eppconfig_path, "-s", "-p", portarg, "-m", modearg, NULL};
+        int i;
+
+	/* set up arguments */
+	sprintf(modearg, "%sclk,%smodem,divider=%d%s,extstat",
+		bc->cfg.intclk ? "int" : "ext",
+		bc->cfg.extmodem ? "ext" : "int", bc->cfg.divider,
+		bc->cfg.loopback ? ",loopback" : "");
+	sprintf(portarg, "%d", bc->pdev->port->base);
+	printk(KERN_DEBUG "%s: %s -s -p %s -m %s\n", bc_drvname, eppconfig_path, portarg, modearg);
+
+        for (i = 0; i < current->files->max_fds; i++ )
+		if (current->files->fd[i]) 
+			close(i);
+        set_fs(KERNEL_DS);      /* Allow execve args to be in kernel space. */
+        current->uid = current->euid = current->fsuid = 0;
+        if (execve(eppconfig_path, argv, envp) < 0) {
+                printk(KERN_ERR "%s: failed to exec %s -s -p %s -m %s, errno = %d\n",
+                       bc_drvname, eppconfig_path, portarg, modearg, errno);
+                return -errno;
+        }
+        return 0;
+}
+
+
+/* eppconfig: called during ifconfig up to configure the modem */
+
+static int eppconfig(struct baycom_state *bc)
+{
+        int i, pid, r;
+	mm_segment_t fs;
+
+        pid = kernel_thread(exec_eppfpga, bc, CLONE_FS);
+        if (pid < 0) {
+                printk(KERN_ERR "%s: fork failed, errno %d\n", bc_drvname, -pid);
+                return pid;
+        }
+	fs = get_fs();
+        set_fs(KERNEL_DS);      /* Allow i to be in kernel space. */
+	r = waitpid(pid, &i, __WCLONE);
+	set_fs(fs);
+        if (r != pid) {
+                printk(KERN_ERR "%s: waitpid(%d) failed, returning %d\n",
+		       bc_drvname, pid, r);
+		return -1;
+        }
+	printk(KERN_DEBUG "%s: eppfpga returned %d\n", bc_drvname, i);
+	return i;
+}
+
+/* ---------------------------------------------------------------------- */
+
+static void epp_interrupt(int irq, void *dev_id, struct pt_regs *regs)
+{
+}
+
+/* ---------------------------------------------------------------------- */
+
+static void inline do_kiss_params(struct baycom_state *bc,
+				  unsigned char *data, unsigned long len)
+{
+
+#ifdef KISS_VERBOSE
+#define PKP(a,b) printk(KERN_INFO "%s: channel params: " a "\n", bc->ifname, b)
+#else /* KISS_VERBOSE */	      
+#define PKP(a,b) 
+#endif /* KISS_VERBOSE */	      
+
+	if (len < 2)
+		return;
+	switch(data[0]) {
+	case PARAM_TXDELAY:
+		bc->ch_params.tx_delay = data[1];
+		PKP("TX delay = %ums", 10 * bc->ch_params.tx_delay);
+		break;
+	case PARAM_PERSIST:   
+		bc->ch_params.ppersist = data[1];
+		PKP("p persistence = %u", bc->ch_params.ppersist);
+		break;
+	case PARAM_SLOTTIME:  
+		bc->ch_params.slottime = data[1];
+		PKP("slot time = %ums", bc->ch_params.slottime);
+		break;
+	case PARAM_TXTAIL:    
+		bc->ch_params.tx_tail = data[1];
+		PKP("TX tail = %ums", bc->ch_params.tx_tail);
+		break;
+	case PARAM_FULLDUP:   
+		bc->ch_params.fulldup = !!data[1];
+		PKP("%s duplex", bc->ch_params.fulldup ? "full" : "half");
+		break;
+	default:
+		break;
+	}
+#undef PKP
+}
+
+/* --------------------------------------------------------------------- */
+/*
+ * high performance HDLC encoder
+ * yes, it's ugly, but generates pretty good code
+ */
+
+#define ENCODEITERA(j)                         \
+({                                             \
+        if (!(notbitstream & (0x1f0 << j)))    \
+                goto stuff##j;                 \
+  encodeend##j:                                \
+})
+
+#define ENCODEITERB(j)                                          \
+({                                                              \
+  stuff##j:                                                     \
+        bitstream &= ~(0x100 << j);                             \
+        bitbuf = (bitbuf & (((2 << j) << numbit) - 1)) |        \
+                ((bitbuf & ~(((2 << j) << numbit) - 1)) << 1);  \
+        numbit++;                                               \
+        notbitstream = ~bitstream;                              \
+        goto encodeend##j;                                      \
+})
+
+
+static void encode_hdlc(struct baycom_state *bc)
+{
+	struct sk_buff *skb;
+	unsigned char *wp, *bp;
+	int pkt_len;
+        unsigned bitstream, notbitstream, bitbuf, numbit, crc;
+	unsigned char crcarr[2];
+	
+	if (bc->hdlctx.bufcnt > 0)
+		return;
+	while ((skb = skb_dequeue(&bc->send_queue))) {
+		if (skb->data[0] != 0) {
+			do_kiss_params(bc, skb->data, skb->len);
+			dev_kfree_skb(skb);
+			continue;
+		}
+		pkt_len = skb->len-1; /* strip KISS byte */
+		if (pkt_len >= HDLCDRV_MAXFLEN || pkt_len < 2) {
+			dev_kfree_skb(skb);
+			continue;
+		}
+		wp = bc->hdlctx.buf;
+		bp = skb->data+1;
+		crc = calc_crc_ccitt(bp, pkt_len);
+		crcarr[0] = crc;
+		crcarr[1] = crc >> 8;
+		*wp++ = 0x7e;
+                bitstream = bitbuf = numbit = 0;
+		while (pkt_len > -2) {
+                        bitstream >>= 8;
+                        bitstream |= ((unsigned int)*bp) << 8;
+                        bitbuf |= ((unsigned int)*bp) << numbit;
+                        notbitstream = ~bitstream;
+			bp++;
+			pkt_len--;
+			if (!pkt_len)
+				bp = crcarr;
+                        ENCODEITERA(0);
+                        ENCODEITERA(1);
+                        ENCODEITERA(2);
+                        ENCODEITERA(3);
+                        ENCODEITERA(4);
+                        ENCODEITERA(5);
+                        ENCODEITERA(6);
+                        ENCODEITERA(7);
+                        goto enditer;
+                        ENCODEITERB(0);
+                        ENCODEITERB(1);
+                        ENCODEITERB(2);
+                        ENCODEITERB(3);
+                        ENCODEITERB(4);
+                        ENCODEITERB(5);
+                        ENCODEITERB(6);
+                        ENCODEITERB(7);
+                  enditer:
+                        numbit += 8;
+                        while (numbit >= 8) {
+                                *wp++ = bitbuf;
+                                bitbuf >>= 8;
+                                numbit -= 8;
+                        }
+                }
+		bitbuf |= 0x7e7e << numbit;
+                numbit += 16;
+                while (numbit >= 8) {
+                        *wp++ = bitbuf;
+                        bitbuf >>= 8;
+                        numbit -= 8;
+                }
+		bc->hdlctx.bufptr = bc->hdlctx.buf;
+		bc->hdlctx.bufcnt = wp - bc->hdlctx.buf;
+		dev_kfree_skb(skb);
+		bc->stats.tx_packets++;
+		return;
+	}
+}
+
+/* ---------------------------------------------------------------------- */
+
+static unsigned short random_seed;
+
+static inline unsigned short random_num(void)
+{
+	random_seed = 28629 * random_seed + 157;
+	return random_seed;
+}
+
+/* ---------------------------------------------------------------------- */
+
+static void transmit(struct baycom_state *bc, int cnt, unsigned char stat)
+{
+	struct parport *pp = bc->pdev->port;
+	int i;
+
+	if (bc->hdlctx.state == tx_tail && !(stat & EPP_PTTBIT))
+		bc->hdlctx.state = tx_idle;
+	if (bc->hdlctx.state == tx_idle && bc->hdlctx.calibrate <= 0) {
+		if (bc->hdlctx.bufcnt <= 0)
+			encode_hdlc(bc);
+		if (bc->hdlctx.bufcnt <= 0)
+			return;
+		if (!bc->ch_params.fulldup) {
+			if (!(stat & EPP_DCDBIT)) {
+				bc->hdlctx.slotcnt = bc->ch_params.slottime;
+				return;
+			}
+			if ((--bc->hdlctx.slotcnt) > 0)
+				return;
+			bc->hdlctx.slotcnt = bc->ch_params.slottime;
+			if ((random_num() % 256) > bc->ch_params.ppersist)
+				return;
+		}
+	}
+	if (bc->hdlctx.state == tx_idle && bc->hdlctx.bufcnt > 0) {
+		bc->hdlctx.state = tx_keyup;
+		bc->hdlctx.flags = tenms_to_flags(bc, bc->ch_params.tx_delay);
+		bc->ptt_keyed++;
+	}
+	while (cnt > 0) {
+		switch (bc->hdlctx.state) {
+		case tx_keyup:
+			i = min(cnt, bc->hdlctx.flags);
+			cnt -= i;
+			bc->hdlctx.flags -= i;
+			if (bc->hdlctx.flags <= 0)
+				bc->hdlctx.state = tx_data;
+			for (; i > 0; i--)
+				parport_epp_write_data(pp, 0x7e);
+			break;
+
+		case tx_data:
+			if (bc->hdlctx.bufcnt <= 0) {
+				encode_hdlc(bc);
+				if (bc->hdlctx.bufcnt <= 0) {
+					bc->hdlctx.state = tx_tail;
+					bc->hdlctx.flags = tenms_to_flags(bc, bc->ch_params.tx_tail);
+					break;
+				}
+			}
+			i = min(cnt, bc->hdlctx.bufcnt);
+			bc->hdlctx.bufcnt -= i;
+			cnt -= i;
+			for (; i > 0; i--)
+				parport_epp_write_data(pp, *(bc->hdlctx.bufptr)++);
+			break;
+			
+		case tx_tail:
+			encode_hdlc(bc);
+			if (bc->hdlctx.bufcnt > 0) {
+				bc->hdlctx.state = tx_data;
+				break;
+			}
+			i = min(cnt, bc->hdlctx.flags);
+			if (i) {
+				cnt -= i;
+				bc->hdlctx.flags -= i;
+				for (; i > 0; i--)
+					parport_epp_write_data(pp, 0x7e);
+				break;
+			}
+
+		default:  /* fall through */
+			if (bc->hdlctx.calibrate <= 0)
+				return;
+			i = min(cnt, bc->hdlctx.calibrate);
+			cnt -= i;
+			bc->hdlctx.calibrate -= i;
+			for (; i > 0; i--)
+				parport_epp_write_data(pp, 0);
+			break;
+		}
+	}
+}
+
+/* ---------------------------------------------------------------------- */
+
+static void do_rxpacket(struct device *dev)
+{
+	struct baycom_state *bc = (struct baycom_state *)dev->priv;
+	struct sk_buff *skb;
+	unsigned char *cp;
+	unsigned pktlen;
+
+	if (bc->hdlcrx.bufcnt < 4) 
+		return;
+	if (!check_crc_ccitt(bc->hdlcrx.buf, bc->hdlcrx.bufcnt)) 
+		return;
+	pktlen = bc->hdlcrx.bufcnt-2+1; /* KISS kludge */
+	if (!(skb = dev_alloc_skb(pktlen))) {
+		printk("%s: memory squeeze, dropping packet\n", bc->ifname);
+		bc->stats.rx_dropped++;
+		return;
+	}
+	skb->dev = dev;
+	cp = skb_put(skb, pktlen);
+	*cp++ = 0; /* KISS kludge */
+	memcpy(cp, bc->hdlcrx.buf, pktlen - 1);
+	skb->protocol = htons(ETH_P_AX25);
+	skb->mac.raw = skb->data;
+	netif_rx(skb);
+	bc->stats.rx_packets++;
+}
+
+#define DECODEITERA(j)                                                        \
+({                                                                            \
+        if (!(notbitstream & (0x0fc << j)))              /* flag or abort */  \
+                goto flgabrt##j;                                              \
+        if ((bitstream & (0x1f8 << j)) == (0xf8 << j))   /* stuffed bit */    \
+                goto stuff##j;                                                \
+  enditer##j:                                                                 \
+})
+
+#define DECODEITERB(j)                                                                 \
+({                                                                                     \
+  flgabrt##j:                                                                          \
+        if (!(notbitstream & (0x1fc << j))) {              /* abort received */        \
+                state = 0;                                                             \
+                goto enditer##j;                                                       \
+        }                                                                              \
+        if ((bitstream & (0x1fe << j)) != (0x0fc << j))   /* flag received */          \
+                goto enditer##j;                                                       \
+        if (state)                                                                     \
+                do_rxpacket(dev);                                                      \
+        bc->hdlcrx.bufcnt = 0;                                                         \
+        bc->hdlcrx.bufptr = bc->hdlcrx.buf;                                            \
+        state = 1;                                                                     \
+        numbits = 7-j;                                                                 \
+        goto enditer##j;                                                               \
+  stuff##j:                                                                            \
+        numbits--;                                                                     \
+        bitbuf = (bitbuf & ((~0xff) << j)) | ((bitbuf & ~((~0xff) << j)) << 1);        \
+        goto enditer##j;                                                               \
+})
+        
+static void receive(struct device *dev, int cnt)
+{
+	struct baycom_state *bc = (struct baycom_state *)dev->priv;
+	struct parport *pp = bc->pdev->port;
+        unsigned int bitbuf, notbitstream, bitstream, numbits, state;
+        unsigned char ch;
+        
+        numbits = bc->hdlcrx.numbits;
+	state = bc->hdlcrx.state;
+	bitstream = bc->hdlcrx.bitstream;
+	bitbuf = bc->hdlcrx.bitbuf;
+	for (; cnt > 0; cnt--) {
+		ch = parport_epp_read_data(pp);
+		bitstream >>= 8;
+                bitstream |= ch << 8;
+                bitbuf >>= 8;
+                bitbuf |= ch << 8;
+                numbits += 8;
+                notbitstream = ~bitstream;
+                DECODEITERA(0);
+                DECODEITERA(1);
+                DECODEITERA(2);
+                DECODEITERA(3);
+                DECODEITERA(4);
+                DECODEITERA(5);
+                DECODEITERA(6);
+                DECODEITERA(7);
+                goto enddec;
+                DECODEITERB(0);
+                DECODEITERB(1);
+                DECODEITERB(2);
+                DECODEITERB(3);
+                DECODEITERB(4);
+                DECODEITERB(5);
+                DECODEITERB(6);
+                DECODEITERB(7);
+          enddec:
+                while (state && numbits >= 8) {
+                        if (bc->hdlcrx.bufcnt >= TXBUFFER_SIZE) {
+                                state = 0;
+                        } else {
+				*(bc->hdlcrx.bufptr)++ = bitbuf >> (16-numbits);
+				bc->hdlcrx.bufcnt++;
+				numbits -= 8;
+			}
+		}
+        }
+        bc->hdlcrx.numbits = numbits;
+	bc->hdlcrx.state = state;
+	bc->hdlcrx.bitstream = bitstream;
+	bc->hdlcrx.bitbuf = bitbuf;
+}
+
+/* --------------------------------------------------------------------- */
+
+#ifdef __i386__
+#define GETTICK(x)                                                \
+({                                                                \
+	if (current_cpu_data.x86_capability & 0x10)               \
+		__asm__ __volatile__("rdtsc" : "=a" (x) : : "dx");\
+})
+#else /* __i386__ */
+#define GETTICK(x)
+#endif /* __i386__ */
+
+static void epp_bh(struct device *dev)
+{
+	struct baycom_state *bc;
+	struct parport *pp;
+	unsigned char stat;
+	unsigned int time1 = 0, time2 = 0, time3 = 0;
+	int cnt, cnt2;
+	
+	baycom_paranoia_check_void(dev, "epp_bh");
+	bc = (struct baycom_state *)dev->priv;
+	if (!bc->bh_running)
+		return;
+	baycom_int_freq(bc);
+	pp = bc->pdev->port;
+	/* update status */
+	bc->stat = stat = parport_epp_read_addr(pp);
+	bc->debug_vals.last_pllcorr = stat;
+	GETTICK(time1);
+	if (bc->modem == EPP_FPGAEXTSTATUS) {
+		/* get input count */
+		parport_epp_write_addr(pp, EPP_TX_FIFO_ENABLE|EPP_RX_FIFO_ENABLE|EPP_MODEM_ENABLE|1);
+		cnt = parport_epp_read_addr(pp);
+		cnt |= parport_epp_read_addr(pp) << 8;
+		cnt &= 0x7fff;
+		/* get output count */
+		parport_epp_write_addr(pp, EPP_TX_FIFO_ENABLE|EPP_RX_FIFO_ENABLE|EPP_MODEM_ENABLE|2);
+		cnt2 = parport_epp_read_addr(pp);
+		cnt2 |= parport_epp_read_addr(pp) << 8;
+		cnt2 = 16384 - (cnt2 & 0x7fff);
+		/* return to normal */
+		parport_epp_write_addr(pp, EPP_TX_FIFO_ENABLE|EPP_RX_FIFO_ENABLE|EPP_MODEM_ENABLE);
+		transmit(bc, cnt2, stat);
+		GETTICK(time2);
+		receive(dev, cnt);
+		bc->stat = stat = parport_epp_read_addr(pp);
+	} else {
+		/* try to tx */
+		switch (stat & (EPP_NTAEF|EPP_NTHF)) {
+		case EPP_NTHF:
+			cnt = 2048 - 256;
+			break;
+		
+		case EPP_NTAEF:
+			cnt = 2048 - 1793;
+			break;
+		
+		case 0:
+			cnt = 0;
+			break;
+		
+		default:
+			cnt = 2048 - 1025;
+			break;
+		}
+		transmit(bc, cnt, stat);
+		GETTICK(time2);
+		/* do receiver */
+		while ((stat & (EPP_NRAEF|EPP_NRHF)) != EPP_NRHF) {
+			switch (stat & (EPP_NRAEF|EPP_NRHF)) {
+			case EPP_NRAEF:
+				cnt = 1025;
+				break;
+
+			case 0:
+				cnt = 1793;
+				break;
+
+			default:
+				cnt = 256;
+				break;
+			}
+			receive(dev, cnt);
+			stat = parport_epp_read_addr(pp);
+			if (parport_epp_check_timeout(pp))
+				goto epptimeout;
+		}
+		cnt = 0;
+		if (bc->bitrate < 50000)
+			cnt = 256;
+		else if (bc->bitrate < 100000)
+			cnt = 128;
+		while (cnt > 0 && stat & EPP_NREF) {
+			receive(dev, 1);
+			cnt--;
+			stat = parport_epp_read_addr(pp);
+		}
+	}
+	GETTICK(time3);
+#ifdef BAYCOM_DEBUG
+	bc->debug_vals.mod_cycles = time2 - time1;
+	bc->debug_vals.demod_cycles = time3 - time2;
+#endif /* BAYCOM_DEBUG */
+	if (parport_epp_check_timeout(pp)) 
+		goto epptimeout;
+	queue_task(&bc->run_bh, &tq_timer);
+	return;
+ epptimeout:
+	printk(KERN_ERR "%s: EPP timeout!\n", bc_drvname);
+}
+
+/* ---------------------------------------------------------------------- */
+/*
+ * ===================== network driver interface =========================
+ */
+
+static int baycom_send_packet(struct sk_buff *skb, struct device *dev)
+{
+	struct baycom_state *bc;
+
+	baycom_paranoia_check(dev, "baycom_send_packet", 0);
+	bc = (struct baycom_state *)dev->priv;
+	skb_queue_tail(&bc->send_queue, skb);
+	dev->trans_start = jiffies;	
+	return 0;
+}
+
+/* --------------------------------------------------------------------- */
+
+static int baycom_set_mac_address(struct device *dev, void *addr)
+{
+	struct sockaddr *sa = (struct sockaddr *)addr;
+
+	/* addr is an AX.25 shifted ASCII mac address */
+	memcpy(dev->dev_addr, sa->sa_data, dev->addr_len); 
+	return 0;                                         
+}
+
+/* --------------------------------------------------------------------- */
+
+static struct net_device_stats *baycom_get_stats(struct device *dev)
+{
+	struct baycom_state *bc;
+
+	baycom_paranoia_check(dev, "baycom_get_stats", NULL);
+	bc = (struct baycom_state *)dev->priv;
+	/* 
+	 * Get the current statistics.  This may be called with the
+	 * card open or closed. 
+	 */
+	return &bc->stats;
+}
+
+/* --------------------------------------------------------------------- */
+
+static int epp_preempt(void *handle)
+{
+        /* we cannot relinquish the port in the middle of an operation */
+        return 1;
+}
+
+/* --------------------------------------------------------------------- */
+
+static void epp_wakeup(void *handle)
+{
+        struct device *dev = (struct device *)handle;
+        struct baycom_state *bc;
+
+	baycom_paranoia_check_void(dev, "epp_wakeup");
+        bc = (struct baycom_state *)dev->priv;
+        printk(KERN_DEBUG "baycom_epp: %s: why am I being woken up?\n", dev->name);
+        if (!parport_claim(bc->pdev))
+                printk(KERN_DEBUG "baycom_epp: %s: I'm broken.\n", dev->name);
+}
+
+/* --------------------------------------------------------------------- */
+
+/*
+ * Open/initialize the board. This is called (in the current kernel)
+ * sometime after booting when the 'ifconfig' program is run.
+ *
+ * This routine should set everything up anew at each open, even
+ * registers that "should" only need to be set once at boot, so that
+ * there is non-reboot way to recover if something goes wrong.
+ */
+
+static int epp_open(struct device *dev)
+{
+	struct baycom_state *bc;
+        struct parport *pp;
+	const struct tq_struct run_bh = {
+		0, 0, (void *)(void *)epp_bh, dev
+	};
+	unsigned int i, j;
+	unsigned char stat;
+	unsigned long tstart;
+	
+	baycom_paranoia_check(dev, "epp_open", -ENXIO);
+	bc = (struct baycom_state *)dev->priv;
+	if (dev->start)
+		return 0;
+        pp = parport_enumerate();
+        while (pp && pp->base != dev->base_addr) 
+                pp = pp->next;
+        if (!pp) {
+                printk(KERN_ERR "%s: parport at 0x%lx unknown\n", bc_drvname, dev->base_addr);
+                return -ENXIO;
+        }
+#if 0
+        if (pp->irq < 0) {
+                printk(KERN_ERR "%s: parport at 0x%lx has no irq\n", bc_drvname, pp->base);
+                return -ENXIO;
+        }
+#endif
+	memset(&bc->modem, 0, sizeof(bc->modem));
+        if (!(bc->pdev = parport_register_device(pp, dev->name, epp_preempt, epp_wakeup, 
+                                                 epp_interrupt, PARPORT_DEV_LURK, dev))) {
+                printk(KERN_ERR "%s: cannot register parport at 0x%lx\n", bc_drvname, pp->base);
+                return -ENXIO;
+        }
+        if (parport_claim(bc->pdev)) {
+                printk(KERN_ERR "%s: parport at 0x%lx busy\n", bc_drvname, pp->base);
+                parport_unregister_device(bc->pdev);
+                return -EBUSY;
+        }
+	if (!(pp->modes & (PARPORT_MODE_PCECPEPP|PARPORT_MODE_PCEPP))) {
+                printk(KERN_ERR "%s: parport at 0x%lx does not support any EPP mode\n",
+		       bc_drvname, pp->base);
+                parport_unregister_device(bc->pdev);
+                return -EIO;		
+	}
+        dev->irq = /*pp->irq*/ 0;
+	bc->run_bh = run_bh;
+	bc->bh_running = 1;
+	if (pp->modes & PARPORT_MODE_PCECPEPP) {
+		printk(KERN_INFO "%s: trying to enable EPP mode\n", bc_drvname);
+		parport_frob_econtrol(pp, 0xe0, 0x80);
+	}
+        /* bc->pdev->port->ops->change_mode(bc->pdev->port, PARPORT_MODE_PCEPP);  not yet implemented */
+	bc->modem = EPP_CONVENTIONAL;
+	if (eppconfig(bc))
+		printk(KERN_INFO "%s: no FPGA detected, assuming conventional EPP modem\n", bc_drvname);
+	else
+		bc->modem = /*EPP_FPGA*/ EPP_FPGAEXTSTATUS;
+	parport_write_control(pp, LPTCTRL_PROGRAM); /* prepare EPP mode; we aren't using interrupts */
+	/* reset the modem */
+	parport_epp_write_addr(pp, 0);
+	parport_epp_write_addr(pp, EPP_TX_FIFO_ENABLE|EPP_RX_FIFO_ENABLE|EPP_MODEM_ENABLE);
+	/* autoprobe baud rate */
+	tstart = jiffies;
+	i = 0;
+	while ((signed)(jiffies-tstart-HZ/3) < 0) {
+		stat = parport_epp_read_addr(pp);
+		if ((stat & (EPP_NRAEF|EPP_NRHF)) == EPP_NRHF) {
+			schedule();
+			continue;
+		}
+		for (j = 0; j < 256; j++)
+			parport_epp_read_data(pp);
+		i += 256;
+	}
+	for (j = 0; j < 256; j++) {
+		stat = parport_epp_read_addr(pp);
+		if (!(stat & EPP_NREF))
+			break;
+		parport_epp_read_data(pp);
+		i++;
+	}
+	tstart = jiffies - tstart;
+	bc->bitrate = i * (8 * HZ) / tstart;
+	j = 1;
+	i = bc->bitrate >> 3;
+	while (j < 7 && i > 150) {
+		j++;
+		i >>= 1;
+	}
+	printk(KERN_INFO "%s: autoprobed bitrate: %d  int divider: %d  int rate: %d\n", 
+	       bc_drvname, bc->bitrate, j, bc->bitrate >> (j+2));
+	parport_epp_write_addr(pp, EPP_TX_FIFO_ENABLE|EPP_RX_FIFO_ENABLE|EPP_MODEM_ENABLE/*|j*/);
+	/*
+	 * initialise hdlc variables
+	 */
+	bc->hdlcrx.state = 0;
+	bc->hdlcrx.numbits = 0;
+	bc->hdlctx.state = tx_idle;
+	bc->hdlctx.bufcnt = 0;
+	bc->hdlctx.slotcnt = bc->ch_params.slottime;
+	bc->hdlctx.calibrate = 0;
+        dev->start = 1;
+       	dev->tbusy = 0;
+	dev->interrupt = 0;
+	/* start the bottom half stuff */
+	queue_task(&bc->run_bh, &tq_timer);
+	MOD_INC_USE_COUNT;
+	return 0;
+
+#if 0
+  errreturn:
+        parport_release(bc->pdev);
+        parport_unregister_device(bc->pdev);
+	return -EIO;
+#endif
+}
+
+/* --------------------------------------------------------------------- */
+
+static int epp_close(struct device *dev)
+{
+	struct baycom_state *bc;
+	struct parport *pp;
+	struct sk_buff *skb;
+
+	baycom_paranoia_check(dev, "epp_close", -EINVAL);
+	if (!dev->start)
+		return 0;
+	bc = (struct baycom_state *)dev->priv;
+	pp = bc->pdev->port;
+	bc->bh_running = 0;
+	dev->start = 0;
+	dev->tbusy = 1;
+	run_task_queue(&tq_timer);  /* dequeue bottom half */
+	bc->stat = EPP_DCDBIT;
+	parport_epp_write_addr(pp, 0);
+	parport_write_control(pp, 0); /* reset the adapter */
+        parport_release(bc->pdev);
+        parport_unregister_device(bc->pdev);
+        /* Free any buffers left in the hardware transmit queue */
+        while ((skb = skb_dequeue(&bc->send_queue)))
+			dev_kfree_skb(skb);
+	printk(KERN_INFO "%s: close epp at iobase 0x%lx irq %u\n",
+	       bc_drvname, dev->base_addr, dev->irq);
+	MOD_DEC_USE_COUNT;
+	return 0;
+}
+
+/* --------------------------------------------------------------------- */
+
+static int baycom_setmode(struct baycom_state *bc, const char *modestr)
+{
+	const char *cp;
+
+	if (strstr(modestr,"intclk"))
+		bc->cfg.intclk = 1;
+	if (strstr(modestr,"extclk"))
+		bc->cfg.intclk = 0;
+	if (strstr(modestr,"intmodem"))
+		bc->cfg.extmodem = 0;
+	if (strstr(modestr,"extmodem"))
+		bc->cfg.extmodem = 1;
+	if (strstr(modestr,"noloopback"))
+		bc->cfg.loopback = 0;
+	if (strstr(modestr,"loopback"))
+		bc->cfg.loopback = 1;
+	if ((cp = strstr(modestr,"divider="))) {
+		bc->cfg.divider = simple_strtoul(cp+8, NULL, 0);
+		if (bc->cfg.divider < 1)
+			bc->cfg.divider = 1;
+		if (bc->cfg.divider > 1023)
+			bc->cfg.divider = 1023;
+	}
+	return 0;
+}
+
+/* --------------------------------------------------------------------- */
+
+static int baycom_ioctl(struct device *dev, struct ifreq *ifr, int cmd)
+{
+	struct baycom_state *bc;
+	struct baycom_ioctl bi;
+	struct hdlcdrv_ioctl hi;
+	struct sm_ioctl si;
+
+	baycom_paranoia_check(dev, "baycom_ioctl", -EINVAL);
+	bc = (struct baycom_state *)dev->priv;
+	if (cmd != SIOCDEVPRIVATE)
+		return -ENOIOCTLCMD;
+	if (get_user(cmd, (int *)ifr->ifr_data))
+		return -EFAULT;
+#ifdef BAYCOM_DEBUG
+	if (cmd == BAYCOMCTL_GETDEBUG) {
+		bi.data.dbg.debug1 = bc->ptt_keyed;
+		bi.data.dbg.debug2 = bc->debug_vals.last_intcnt;
+		bi.data.dbg.debug3 = bc->debug_vals.last_pllcorr;
+		bc->debug_vals.last_intcnt = 0;
+		if (copy_to_user(ifr->ifr_data, &bi, sizeof(bi)))
+			return -EFAULT;
+		return 0;
+	}
+	if (cmd == SMCTL_GETDEBUG) {
+                si.data.dbg.int_rate = bc->debug_vals.last_intcnt;
+                si.data.dbg.mod_cycles = bc->debug_vals.mod_cycles;
+                si.data.dbg.demod_cycles = bc->debug_vals.demod_cycles;
+                si.data.dbg.dma_residue = 0;
+                bc->debug_vals.mod_cycles = bc->debug_vals.demod_cycles = 0;
+		bc->debug_vals.last_intcnt = 0;
+                if (copy_to_user(ifr->ifr_data, &si, sizeof(si)))
+                        return -EFAULT;
+                return 0;
+	}
+#endif /* BAYCOM_DEBUG */
+
+	if (copy_from_user(&hi, ifr->ifr_data, sizeof(hi)))
+		return -EFAULT;
+	switch (hi.cmd) {
+	default:
+		return -ENOIOCTLCMD;
+
+	case HDLCDRVCTL_GETCHANNELPAR:
+		hi.data.cp.tx_delay = bc->ch_params.tx_delay;
+		hi.data.cp.tx_tail = bc->ch_params.tx_tail;
+		hi.data.cp.slottime = bc->ch_params.slottime;
+		hi.data.cp.ppersist = bc->ch_params.ppersist;
+		hi.data.cp.fulldup = bc->ch_params.fulldup;
+		break;
+
+	case HDLCDRVCTL_SETCHANNELPAR:
+		if (!suser())
+			return -EACCES;
+		bc->ch_params.tx_delay = hi.data.cp.tx_delay;
+		bc->ch_params.tx_tail = hi.data.cp.tx_tail;
+		bc->ch_params.slottime = hi.data.cp.slottime;
+		bc->ch_params.ppersist = hi.data.cp.ppersist;
+		bc->ch_params.fulldup = hi.data.cp.fulldup;
+		bc->hdlctx.slotcnt = 1;
+		return 0;
+		
+	case HDLCDRVCTL_GETMODEMPAR:
+		hi.data.mp.iobase = dev->base_addr;
+		hi.data.mp.irq = dev->irq;
+		hi.data.mp.dma = dev->dma;
+		hi.data.mp.dma2 = 0;
+		hi.data.mp.seriobase = 0;
+		hi.data.mp.pariobase = 0;
+		hi.data.mp.midiiobase = 0;
+		break;
+
+	case HDLCDRVCTL_SETMODEMPAR:
+		if ((!suser()) || dev->start)
+			return -EACCES;
+		dev->base_addr = hi.data.mp.iobase;
+		dev->irq = /*hi.data.mp.irq*/0;
+		dev->dma = /*hi.data.mp.dma*/0;
+		return 0;	
+		
+	case HDLCDRVCTL_GETSTAT:
+		hi.data.cs.ptt = !!(bc->stat & EPP_PTTBIT);
+		hi.data.cs.dcd = !(bc->stat & EPP_DCDBIT);
+		hi.data.cs.ptt_keyed = bc->ptt_keyed;
+		hi.data.cs.tx_packets = bc->stats.tx_packets;
+		hi.data.cs.tx_errors = bc->stats.tx_errors;
+		hi.data.cs.rx_packets = bc->stats.rx_packets;
+		hi.data.cs.rx_errors = bc->stats.rx_errors;
+		break;		
+
+	case HDLCDRVCTL_OLDGETSTAT:
+		hi.data.ocs.ptt = !!(bc->stat & EPP_PTTBIT);
+		hi.data.ocs.dcd = !(bc->stat & EPP_DCDBIT);
+		hi.data.ocs.ptt_keyed = bc->ptt_keyed;
+		break;		
+
+	case HDLCDRVCTL_CALIBRATE:
+		bc->hdlctx.calibrate = hi.data.calibrate * bc->bitrate / 8;
+		return 0;
+
+	case HDLCDRVCTL_DRIVERNAME:
+		strncpy(hi.data.drivername, "baycom_epp", sizeof(hi.data.drivername));
+		break;
+		
+	case HDLCDRVCTL_GETMODE:
+		sprintf(hi.data.modename, "%sclk,%smodem,divider=%d%s", 
+			bc->cfg.intclk ? "int" : "ext",
+			bc->cfg.extmodem ? "ext" : "int", bc->cfg.divider,
+			bc->cfg.loopback ? ",loopback" : "");
+		break;
+
+	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:
+		strncpy(hi.data.modename, "intclk,extclk,intmodem,extmodem,divider=x",
+			sizeof(hi.data.modename));
+		break;
+
+	case HDLCDRVCTL_MODEMPARMASK:
+		return HDLCDRV_PARMASK_IOBASE;
+
+	}
+	if (copy_to_user(ifr->ifr_data, &hi, sizeof(hi)))
+		return -EFAULT;
+	return 0;
+}
+
+/* --------------------------------------------------------------------- */
+
+/*
+ * Check for a network adaptor of this type, and return '0' if one exists.
+ * If dev->base_addr == 0, probe all likely locations.
+ * If dev->base_addr == 1, always return failure.
+ * If dev->base_addr == 2, allocate space for the device and return success
+ * (detachable devices only).
+ */
+static int baycom_probe(struct device *dev)
+{
+	static char ax25_bcast[AX25_ADDR_LEN] = {
+		'Q' << 1, 'S' << 1, 'T' << 1, ' ' << 1, ' ' << 1, ' ' << 1, '0' << 1
+	};
+	static char ax25_nocall[AX25_ADDR_LEN] = {
+		'L' << 1, 'I' << 1, 'N' << 1, 'U' << 1, 'X' << 1, ' ' << 1, '1' << 1
+	};
+	const struct hdlcdrv_channel_params dflt_ch_params = { 
+		20, 2, 10, 40, 0 
+	};
+	struct baycom_state *bc;
+
+	if (!dev)
+		return -ENXIO;
+	baycom_paranoia_check(dev, "baycom_probe", -ENXIO);
+	/*
+	 * not a real probe! only initialize data structures
+	 */
+	bc = (struct baycom_state *)dev->priv;
+	/*
+	 * initialize the baycom_state struct
+	 */
+	bc->ch_params = dflt_ch_params;
+	bc->ptt_keyed = 0;
+
+	/*
+	 * initialize the device struct
+	 */
+	dev->open = epp_open;
+	dev->stop = epp_close;
+	dev->do_ioctl = baycom_ioctl;
+	dev->hard_start_xmit = baycom_send_packet;
+	dev->get_stats = baycom_get_stats;
+
+	/* Fill in the fields of the device structure */
+	dev_init_buffers(dev);
+
+	skb_queue_head_init(&bc->send_queue);
+	
+#if defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE)
+	dev->hard_header = ax25_encapsulate;
+	dev->rebuild_header = ax25_rebuild_header;
+#else /* CONFIG_AX25 || CONFIG_AX25_MODULE */
+	dev->hard_header = NULL;
+	dev->rebuild_header = NULL;
+#endif /* CONFIG_AX25 || CONFIG_AX25_MODULE */
+	dev->set_mac_address = baycom_set_mac_address;
+	
+	dev->type = ARPHRD_AX25;           /* AF_AX25 device */
+	dev->hard_header_len = AX25_MAX_HEADER_LEN + AX25_BPQ_HEADER_LEN;
+	dev->mtu = AX25_DEF_PACLEN;        /* eth_mtu is the default */
+	dev->addr_len = AX25_ADDR_LEN;     /* sizeof an ax.25 address */
+	memcpy(dev->broadcast, ax25_bcast, AX25_ADDR_LEN);
+	memcpy(dev->dev_addr, ax25_nocall, AX25_ADDR_LEN);
+
+	/* New style flags */
+	dev->flags = 0;
+
+	return 0;
+}
+
+/* --------------------------------------------------------------------- */
+
+__initfunc(int baycom_epp_init(void))
+{
+	struct device *dev;
+	int i, found = 0;
+	char set_hw = 1;
+	struct baycom_state *bc;
+
+	printk(bc_drvinfo);
+	/*
+	 * register net devices
+	 */
+	for (i = 0; i < NR_PORTS; i++) {
+		dev = baycom_device+i;
+		if (!baycom_ports[i].mode)
+			set_hw = 0;
+		if (!set_hw)
+			baycom_ports[i].iobase = 0;
+		memset(dev, 0, sizeof(struct device));
+		if (!(bc = dev->priv = kmalloc(sizeof(struct baycom_state), GFP_KERNEL)))
+			return -ENOMEM;
+		/*
+		 * initialize part of the baycom_state struct
+		 */
+		memset(bc, 0, sizeof(struct baycom_state));
+		bc->magic = BAYCOM_MAGIC;
+		sprintf(bc->ifname, "bce%d", i);
+		/*
+		 * initialize part of the device struct
+		 */
+		dev->name = bc->ifname;
+		dev->if_port = 0;
+		dev->init = baycom_probe;
+		dev->start = 0;
+		dev->tbusy = 1;
+		dev->base_addr = baycom_ports[i].iobase;
+		dev->irq = 0;
+		dev->dma = 0;
+		if (register_netdev(dev)) {
+			printk(KERN_WARNING "%s: cannot register net device %s\n", bc_drvname, bc->ifname);
+			kfree(dev->priv);
+			return -ENXIO;
+		}
+		if (set_hw && baycom_setmode(bc, baycom_ports[i].mode))
+			set_hw = 0;
+		found++;
+	}
+	if (!found)
+		return -ENXIO;
+	return 0;
+}
+
+/* --------------------------------------------------------------------- */
+
+#ifdef MODULE
+
+/*
+ * command line settable parameters
+ */
+static const char *mode[NR_PORTS] = { "epp", };
+static int iobase[NR_PORTS] = { 0x378, };
+
+#if LINUX_VERSION_CODE >= 0x20115
+
+MODULE_PARM(mode, "s");
+MODULE_PARM_DESC(mode, "baycom operating mode; epp");
+MODULE_PARM(iobase, "i");
+MODULE_PARM_DESC(iobase, "baycom io base address");
+
+MODULE_AUTHOR("Thomas M. Sailer, sailer@ife.ee.ethz.ch, hb9jnx@hb9w.che.eu");
+MODULE_DESCRIPTION("Baycom epp 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_epp_init();
+}
+
+/* --------------------------------------------------------------------- */
+
+void cleanup_module(void)
+{
+	struct device *dev;
+	struct baycom_state *bc;
+	int i;
+
+	for(i = 0; i < NR_PORTS; i++) {
+		dev = baycom_device+i;
+		bc = (struct baycom_state *)dev->priv;
+		if (bc) {
+			if (bc->magic == BAYCOM_MAGIC) {
+				unregister_netdev(dev);
+				kfree(dev->priv);
+			} else
+				printk(paranoia_str, "cleanup_module");
+		}
+	}
+}
+
+#else /* MODULE */
+/* --------------------------------------------------------------------- */
+/*
+ * format: baycom=io,mode
+ * mode: epp
+ */
+
+__initfunc(void baycom_epp_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].irq = ints[1];
+	if (i < NR_PORTS-1)
+		baycom_ports[i+1].mode = NULL;
+}
+
+#endif /* MODULE */
+/* --------------------------------------------------------------------- */

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TCL-scripts by Sam Shen, slshen@lbl.gov