Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 817 insertions, 0 deletions

diff --git a/drivers/net/hamradio/hdlcdrv.c b/drivers/net/hamradio/hdlcdrv.c
new file mode 100644
index 000000000000..b89959a596d7
--- /dev/null
+++ b/drivers/net/hamradio/hdlcdrv.c
@@ -0,0 +1,817 @@
+/*****************************************************************************/
+
+/*
+ *      hdlcdrv.c  -- HDLC packet radio network driver.
+ *
+ *      Copyright (C) 1996-2000  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.
+ *
+ *  The driver was derived from Donald Beckers skeleton.c
+ *      Written 1993-94 by Donald Becker.
+ *
+ *  History:
+ *   0.1  21.09.1996  Started
+ *        18.10.1996  Changed to new user space access routines 
+ *                    (copy_{to,from}_user)
+ *   0.2  21.11.1996  various small changes
+ *   0.3  03.03.1997  fixed (hopefully) IP not working with ax.25 as a module
+ *   0.4  16.04.1997  init code/data tagged
+ *   0.5  30.07.1997  made HDLC buffers bigger (solves a problem with the
+ *                    soundmodem driver)
+ *   0.6  05.04.1998  add spinlocks
+ *   0.7  03.08.1999  removed some old compatibility cruft
+ *   0.8  12.02.2000  adapted to softnet driver interface
+ */
+
+/*****************************************************************************/
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/net.h>
+#include <linux/in.h>
+#include <linux/if.h>
+#include <linux/slab.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/bitops.h>
+#include <asm/uaccess.h>
+
+#include <linux/netdevice.h>
+#include <linux/if_arp.h>
+#include <linux/etherdevice.h>
+#include <linux/skbuff.h>
+#include <linux/hdlcdrv.h>
+/* prototypes for ax25_encapsulate and ax25_rebuild_header */
+#include <net/ax25.h> 
+
+/* make genksyms happy */
+#include <linux/ip.h>
+#include <linux/udp.h>
+#include <linux/tcp.h>
+#include <linux/crc-ccitt.h>
+
+/* --------------------------------------------------------------------- */
+
+/*
+ * The name of the card. Is used for messages and in the requests for
+ * io regions, irqs and dma channels
+ */
+
+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};
+
+/* --------------------------------------------------------------------- */
+
+#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 inline void append_crc_ccitt(unsigned char *buffer, int len)
+{
+        unsigned int crc = crc_ccitt(0xffff, buffer, len) ^ 0xffff;
+        *buffer++ = crc;
+        *buffer++ = crc >> 8;
+}
+
+/*---------------------------------------------------------------------------*/
+
+static inline int check_crc_ccitt(const unsigned char *buf, int cnt)
+{
+        return (crc_ccitt(0xffff, buf, cnt) & 0xffff) == 0xf0b8;
+}
+
+/*---------------------------------------------------------------------------*/
+
+#if 0
+static 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);
+}
+#endif
+
+/* ---------------------------------------------------------------------- */
+
+#define tenms_to_2flags(s,tenms) ((tenms * s->par.bitrate) / 100 / 16)
+
+/* ---------------------------------------------------------------------- */
+/*
+ * The HDLC routines
+ */
+
+static int hdlc_rx_add_bytes(struct hdlcdrv_state *s, unsigned int bits, 
+                             int num)
+{
+        int added = 0;
+        
+        while (s->hdlcrx.rx_state && num >= 8) {
+                if (s->hdlcrx.len >= sizeof(s->hdlcrx.buffer)) {
+                        s->hdlcrx.rx_state = 0;
+                        return 0;
+                }
+                *s->hdlcrx.bp++ = bits >> (32-num);
+                s->hdlcrx.len++;
+                num -= 8;
+                added += 8;
+        }
+        return added;
+}
+
+static void hdlc_rx_flag(struct net_device *dev, struct hdlcdrv_state *s)
+{
+        struct sk_buff *skb;
+        int pkt_len;
+        unsigned char *cp;
+
+        if (s->hdlcrx.len < 4) 
+                return;
+        if (!check_crc_ccitt(s->hdlcrx.buffer, s->hdlcrx.len)) 
+                return;
+        pkt_len = s->hdlcrx.len - 2 + 1; /* KISS kludge */
+        if (!(skb = dev_alloc_skb(pkt_len))) {
+                printk("%s: memory squeeze, dropping packet\n", dev->name);
+                s->stats.rx_dropped++;
+                return;
+        }
+        skb->dev = dev;
+        cp = skb_put(skb, pkt_len);
+        *cp++ = 0; /* KISS kludge */
+        memcpy(cp, s->hdlcrx.buffer, pkt_len - 1);
+        skb->protocol = htons(ETH_P_AX25);
+        skb->mac.raw = skb->data;
+        netif_rx(skb);
+        dev->last_rx = jiffies;
+        s->stats.rx_packets++;
+}
+
+void hdlcdrv_receiver(struct net_device *dev, struct hdlcdrv_state *s)
+{
+        int i;
+        unsigned int mask1, mask2, mask3, mask4, mask5, mask6, word;
+        
+        if (!s || s->magic != HDLCDRV_MAGIC) 
+                return;
+        if (test_and_set_bit(0, &s->hdlcrx.in_hdlc_rx))
+                return;
+
+        while (!hdlcdrv_hbuf_empty(&s->hdlcrx.hbuf)) {
+                word = hdlcdrv_hbuf_get(&s->hdlcrx.hbuf);       
+
+#ifdef HDLCDRV_DEBUG
+                hdlcdrv_add_bitbuffer_word(&s->bitbuf_hdlc, word);
+#endif /* HDLCDRV_DEBUG */
+                s->hdlcrx.bitstream >>= 16;
+                s->hdlcrx.bitstream |= word << 16;
+                s->hdlcrx.bitbuf >>= 16;
+                s->hdlcrx.bitbuf |= word << 16;
+                s->hdlcrx.numbits += 16;
+                for(i = 15, mask1 = 0x1fc00, mask2 = 0x1fe00, mask3 = 0x0fc00,
+                    mask4 = 0x1f800, mask5 = 0xf800, mask6 = 0xffff; 
+                    i >= 0; 
+                    i--, mask1 <<= 1, mask2 <<= 1, mask3 <<= 1, mask4 <<= 1, 
+                    mask5 <<= 1, mask6 = (mask6 << 1) | 1) {
+                        if ((s->hdlcrx.bitstream & mask1) == mask1)
+                                s->hdlcrx.rx_state = 0; /* abort received */
+                        else if ((s->hdlcrx.bitstream & mask2) == mask3) {
+                                /* flag received */
+                                if (s->hdlcrx.rx_state) {
+                                        hdlc_rx_add_bytes(s, s->hdlcrx.bitbuf 
+                                                          << (8+i),
+                                                          s->hdlcrx.numbits
+                                                          -8-i);
+                                        hdlc_rx_flag(dev, s);
+                                }
+                                s->hdlcrx.len = 0;
+                                s->hdlcrx.bp = s->hdlcrx.buffer;
+                                s->hdlcrx.rx_state = 1;
+                                s->hdlcrx.numbits = i;
+                        } else if ((s->hdlcrx.bitstream & mask4) == mask5) {
+                                /* stuffed bit */
+                                s->hdlcrx.numbits--;
+                                s->hdlcrx.bitbuf = (s->hdlcrx.bitbuf & (~mask6)) |
+                                        ((s->hdlcrx.bitbuf & mask6) << 1);
+                        }
+                }
+                s->hdlcrx.numbits -= hdlc_rx_add_bytes(s, s->hdlcrx.bitbuf,
+                                                       s->hdlcrx.numbits);
+        }
+        clear_bit(0, &s->hdlcrx.in_hdlc_rx);
+}
+
+/* ---------------------------------------------------------------------- */
+
+static inline void do_kiss_params(struct hdlcdrv_state *s,
+                                  unsigned char *data, unsigned long len)
+{
+
+#ifdef KISS_VERBOSE
+#define PKP(a,b) printk(KERN_INFO "hdlcdrv.c: channel params: " a "\n", b)
+#else /* KISS_VERBOSE */              
+#define PKP(a,b) 
+#endif /* KISS_VERBOSE */             
+
+        if (len < 2)
+                return;
+        switch(data[0]) {
+        case PARAM_TXDELAY:
+                s->ch_params.tx_delay = data[1];
+                PKP("TX delay = %ums", 10 * s->ch_params.tx_delay);
+                break;
+        case PARAM_PERSIST:   
+                s->ch_params.ppersist = data[1];
+                PKP("p persistence = %u", s->ch_params.ppersist);
+                break;
+        case PARAM_SLOTTIME:  
+                s->ch_params.slottime = data[1];
+                PKP("slot time = %ums", s->ch_params.slottime);
+                break;
+        case PARAM_TXTAIL:    
+                s->ch_params.tx_tail = data[1];
+                PKP("TX tail = %ums", s->ch_params.tx_tail);
+                break;
+        case PARAM_FULLDUP:   
+                s->ch_params.fulldup = !!data[1];
+                PKP("%s duplex", s->ch_params.fulldup ? "full" : "half");
+                break;
+        default:
+                break;
+        }
+#undef PKP
+}
+
+/* ---------------------------------------------------------------------- */
+
+void hdlcdrv_transmitter(struct net_device *dev, struct hdlcdrv_state *s)
+{
+        unsigned int mask1, mask2, mask3;
+        int i;
+        struct sk_buff *skb;
+        int pkt_len;
+
+        if (!s || s->magic != HDLCDRV_MAGIC) 
+                return;
+        if (test_and_set_bit(0, &s->hdlctx.in_hdlc_tx))
+                return;
+        for (;;) {
+                if (s->hdlctx.numbits >= 16) {
+                        if (hdlcdrv_hbuf_full(&s->hdlctx.hbuf)) {
+                                clear_bit(0, &s->hdlctx.in_hdlc_tx);
+                                return;
+                        }
+                        hdlcdrv_hbuf_put(&s->hdlctx.hbuf, s->hdlctx.bitbuf);
+                        s->hdlctx.bitbuf >>= 16;
+                        s->hdlctx.numbits -= 16;
+                }
+                switch (s->hdlctx.tx_state) {
+                default:
+                        clear_bit(0, &s->hdlctx.in_hdlc_tx);
+                        return;
+                case 0:
+                case 1:
+                        if (s->hdlctx.numflags) {
+                                s->hdlctx.numflags--;
+                                s->hdlctx.bitbuf |= 
+                                        0x7e7e << s->hdlctx.numbits;
+                                s->hdlctx.numbits += 16;
+                                break;
+                        }
+                        if (s->hdlctx.tx_state == 1) {
+                                clear_bit(0, &s->hdlctx.in_hdlc_tx);
+                                return;
+                        }
+                        if (!(skb = s->skb)) {
+                                int flgs = tenms_to_2flags(s, s->ch_params.tx_tail);
+                                if (flgs < 2)
+                                        flgs = 2;
+                                s->hdlctx.tx_state = 1;
+                                s->hdlctx.numflags = flgs;
+                                break;
+                        }
+                        s->skb = NULL;
+                        netif_wake_queue(dev);
+                        pkt_len = skb->len-1; /* strip KISS byte */
+                        if (pkt_len >= HDLCDRV_MAXFLEN || pkt_len < 2) {
+                                s->hdlctx.tx_state = 0;
+                                s->hdlctx.numflags = 1;
+                                dev_kfree_skb_irq(skb);
+                                break;
+                        }
+                        memcpy(s->hdlctx.buffer, skb->data+1, pkt_len);
+                        dev_kfree_skb_irq(skb);
+                        s->hdlctx.bp = s->hdlctx.buffer;
+                        append_crc_ccitt(s->hdlctx.buffer, pkt_len);
+                        s->hdlctx.len = pkt_len+2; /* the appended CRC */
+                        s->hdlctx.tx_state = 2;
+                        s->hdlctx.bitstream = 0;
+                        s->stats.tx_packets++;
+                        break;
+                case 2:
+                        if (!s->hdlctx.len) {
+                                s->hdlctx.tx_state = 0;
+                                s->hdlctx.numflags = 1;
+                                break;
+                        }
+                        s->hdlctx.len--;
+                        s->hdlctx.bitbuf |= *s->hdlctx.bp <<
+                                s->hdlctx.numbits;
+                        s->hdlctx.bitstream >>= 8;
+                        s->hdlctx.bitstream |= (*s->hdlctx.bp++) << 16;
+                        mask1 = 0x1f000;
+                        mask2 = 0x10000;
+                        mask3 = 0xffffffff >> (31-s->hdlctx.numbits);
+                        s->hdlctx.numbits += 8;
+                        for(i = 0; i < 8; i++, mask1 <<= 1, mask2 <<= 1, 
+                            mask3 = (mask3 << 1) | 1) {
+                                if ((s->hdlctx.bitstream & mask1) != mask1) 
+                                        continue;
+                                s->hdlctx.bitstream &= ~mask2;
+                                s->hdlctx.bitbuf = 
+                                        (s->hdlctx.bitbuf & mask3) |
+                                                ((s->hdlctx.bitbuf & 
+                                                 (~mask3)) << 1);
+                                s->hdlctx.numbits++;
+                                mask3 = (mask3 << 1) | 1;
+                        }
+                        break;
+                }
+        }
+}
+
+/* ---------------------------------------------------------------------- */
+
+static void start_tx(struct net_device *dev, struct hdlcdrv_state *s)
+{
+        s->hdlctx.tx_state = 0;
+        s->hdlctx.numflags = tenms_to_2flags(s, s->ch_params.tx_delay);
+        s->hdlctx.bitbuf = s->hdlctx.bitstream = s->hdlctx.numbits = 0;
+        hdlcdrv_transmitter(dev, s);
+        s->hdlctx.ptt = 1;
+        s->ptt_keyed++;
+}
+
+/* ---------------------------------------------------------------------- */
+
+static unsigned short random_seed;
+
+static inline unsigned short random_num(void)
+{
+        random_seed = 28629 * random_seed + 157;
+        return random_seed;
+}
+
+/* ---------------------------------------------------------------------- */
+
+void hdlcdrv_arbitrate(struct net_device *dev, struct hdlcdrv_state *s)
+{
+        if (!s || s->magic != HDLCDRV_MAGIC || s->hdlctx.ptt || !s->skb) 
+                return;
+        if (s->ch_params.fulldup) {
+                start_tx(dev, s);
+                return;
+        }
+        if (s->hdlcrx.dcd) {
+                s->hdlctx.slotcnt = s->ch_params.slottime;
+                return;
+        }
+        if ((--s->hdlctx.slotcnt) > 0)
+                return;
+        s->hdlctx.slotcnt = s->ch_params.slottime;
+        if ((random_num() % 256) > s->ch_params.ppersist)
+                return;
+        start_tx(dev, s);
+}
+
+/* --------------------------------------------------------------------- */
+/*
+ * ===================== network driver interface =========================
+ */
+
+static int hdlcdrv_send_packet(struct sk_buff *skb, struct net_device *dev)
+{
+        struct hdlcdrv_state *sm = netdev_priv(dev);
+
+        if (skb->data[0] != 0) {
+                do_kiss_params(sm, skb->data, skb->len);
+                dev_kfree_skb(skb);
+                return 0;
+        }
+        if (sm->skb)
+                return -1;
+        netif_stop_queue(dev);
+        sm->skb = skb;
+        return 0;
+}
+
+/* --------------------------------------------------------------------- */
+
+static int hdlcdrv_set_mac_address(struct net_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 *hdlcdrv_get_stats(struct net_device *dev)
+{
+        struct hdlcdrv_state *sm = netdev_priv(dev);
+
+        /* 
+         * Get the current statistics.  This may be called with the
+         * card open or closed. 
+         */
+        return &sm->stats;
+}
+
+/* --------------------------------------------------------------------- */
+/*
+ * 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 hdlcdrv_open(struct net_device *dev)
+{
+        struct hdlcdrv_state *s = netdev_priv(dev);
+        int i;
+
+        if (!s->ops || !s->ops->open)
+                return -ENODEV;
+
+        /*
+         * initialise some variables
+         */
+        s->opened = 1;
+        s->hdlcrx.hbuf.rd = s->hdlcrx.hbuf.wr = 0;
+        s->hdlcrx.in_hdlc_rx = 0;
+        s->hdlcrx.rx_state = 0;
+        
+        s->hdlctx.hbuf.rd = s->hdlctx.hbuf.wr = 0;
+        s->hdlctx.in_hdlc_tx = 0;
+        s->hdlctx.tx_state = 1;
+        s->hdlctx.numflags = 0;
+        s->hdlctx.bitstream = s->hdlctx.bitbuf = s->hdlctx.numbits = 0;
+        s->hdlctx.ptt = 0;
+        s->hdlctx.slotcnt = s->ch_params.slottime;
+        s->hdlctx.calibrate = 0;
+
+        i = s->ops->open(dev);
+        if (i)
+                return i;
+        netif_start_queue(dev);
+        return 0;
+}
+
+/* --------------------------------------------------------------------- */
+/* 
+ * The inverse routine to hdlcdrv_open(). 
+ */
+
+static int hdlcdrv_close(struct net_device *dev)
+{
+        struct hdlcdrv_state *s = netdev_priv(dev);
+        int i = 0;
+
+        netif_stop_queue(dev);
+
+        if (s->ops && s->ops->close)
+                i = s->ops->close(dev);
+        if (s->skb)
+                dev_kfree_skb(s->skb);
+        s->skb = NULL;
+        s->opened = 0;
+        return i;
+}
+
+/* --------------------------------------------------------------------- */
+
+static int hdlcdrv_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
+{
+        struct hdlcdrv_state *s = netdev_priv(dev);
+        struct hdlcdrv_ioctl bi;
+
+        if (cmd != SIOCDEVPRIVATE) {
+                if (s->ops && s->ops->ioctl)
+                        return s->ops->ioctl(dev, ifr, &bi, cmd);
+                return -ENOIOCTLCMD;
+        }
+        if (copy_from_user(&bi, ifr->ifr_data, sizeof(bi)))
+                return -EFAULT;
+
+        switch (bi.cmd) {
+        default:
+                if (s->ops && s->ops->ioctl)
+                        return s->ops->ioctl(dev, ifr, &bi, cmd);
+                return -ENOIOCTLCMD;
+
+        case HDLCDRVCTL_GETCHANNELPAR:
+                bi.data.cp.tx_delay = s->ch_params.tx_delay;
+                bi.data.cp.tx_tail = s->ch_params.tx_tail;
+                bi.data.cp.slottime = s->ch_params.slottime;
+                bi.data.cp.ppersist = s->ch_params.ppersist;
+                bi.data.cp.fulldup = s->ch_params.fulldup;
+                break;
+
+        case HDLCDRVCTL_SETCHANNELPAR:
+                if (!capable(CAP_NET_ADMIN))
+                        return -EACCES;
+                s->ch_params.tx_delay = bi.data.cp.tx_delay;
+                s->ch_params.tx_tail = bi.data.cp.tx_tail;
+                s->ch_params.slottime = bi.data.cp.slottime;
+                s->ch_params.ppersist = bi.data.cp.ppersist;
+                s->ch_params.fulldup = bi.data.cp.fulldup;
+                s->hdlctx.slotcnt = 1;
+                return 0;
+                
+        case HDLCDRVCTL_GETMODEMPAR:
+                bi.data.mp.iobase = dev->base_addr;
+                bi.data.mp.irq = dev->irq;
+                bi.data.mp.dma = dev->dma;
+                bi.data.mp.dma2 = s->ptt_out.dma2;
+                bi.data.mp.seriobase = s->ptt_out.seriobase;
+                bi.data.mp.pariobase = s->ptt_out.pariobase;
+                bi.data.mp.midiiobase = s->ptt_out.midiiobase;
+                break;
+
+        case HDLCDRVCTL_SETMODEMPAR:
+                if ((!capable(CAP_SYS_RAWIO)) || netif_running(dev))
+                        return -EACCES;
+                dev->base_addr = bi.data.mp.iobase;
+                dev->irq = bi.data.mp.irq;
+                dev->dma = bi.data.mp.dma;
+                s->ptt_out.dma2 = bi.data.mp.dma2;
+                s->ptt_out.seriobase = bi.data.mp.seriobase;
+                s->ptt_out.pariobase = bi.data.mp.pariobase;
+                s->ptt_out.midiiobase = bi.data.mp.midiiobase;
+                return 0;       
+        
+        case HDLCDRVCTL_GETSTAT:
+                bi.data.cs.ptt = hdlcdrv_ptt(s);
+                bi.data.cs.dcd = s->hdlcrx.dcd;
+                bi.data.cs.ptt_keyed = s->ptt_keyed;
+                bi.data.cs.tx_packets = s->stats.tx_packets;
+                bi.data.cs.tx_errors = s->stats.tx_errors;
+                bi.data.cs.rx_packets = s->stats.rx_packets;
+                bi.data.cs.rx_errors = s->stats.rx_errors;
+                break;          
+
+        case HDLCDRVCTL_OLDGETSTAT:
+                bi.data.ocs.ptt = hdlcdrv_ptt(s);
+                bi.data.ocs.dcd = s->hdlcrx.dcd;
+                bi.data.ocs.ptt_keyed = s->ptt_keyed;
+                break;          
+
+        case HDLCDRVCTL_CALIBRATE:
+                if(!capable(CAP_SYS_RAWIO))
+                        return -EPERM;
+                s->hdlctx.calibrate = bi.data.calibrate * s->par.bitrate / 16;
+                return 0;
+
+        case HDLCDRVCTL_GETSAMPLES:
+#ifndef HDLCDRV_DEBUG
+                return -EPERM;
+#else /* HDLCDRV_DEBUG */
+                if (s->bitbuf_channel.rd == s->bitbuf_channel.wr) 
+                        return -EAGAIN;
+                bi.data.bits = 
+                        s->bitbuf_channel.buffer[s->bitbuf_channel.rd];
+                s->bitbuf_channel.rd = (s->bitbuf_channel.rd+1) %
+                        sizeof(s->bitbuf_channel.buffer);
+                break;
+#endif /* HDLCDRV_DEBUG */
+                                
+        case HDLCDRVCTL_GETBITS:
+#ifndef HDLCDRV_DEBUG
+                return -EPERM;
+#else /* HDLCDRV_DEBUG */
+                if (s->bitbuf_hdlc.rd == s->bitbuf_hdlc.wr) 
+                        return -EAGAIN;
+                bi.data.bits = 
+                        s->bitbuf_hdlc.buffer[s->bitbuf_hdlc.rd];
+                s->bitbuf_hdlc.rd = (s->bitbuf_hdlc.rd+1) %
+                        sizeof(s->bitbuf_hdlc.buffer);
+                break;          
+#endif /* HDLCDRV_DEBUG */
+
+        case HDLCDRVCTL_DRIVERNAME:
+                if (s->ops && s->ops->drvname) {
+                        strncpy(bi.data.drivername, s->ops->drvname, 
+                                sizeof(bi.data.drivername));
+                        break;
+                }
+                bi.data.drivername[0] = '\0';
+                break;
+                
+        }
+        if (copy_to_user(ifr->ifr_data, &bi, sizeof(bi)))
+                return -EFAULT;
+        return 0;
+
+}
+
+/* --------------------------------------------------------------------- */
+
+/*
+ * Initialize fields in hdlcdrv
+ */
+static void hdlcdrv_setup(struct net_device *dev)
+{
+        static const struct hdlcdrv_channel_params dflt_ch_params = { 
+                20, 2, 10, 40, 0 
+        };
+        struct hdlcdrv_state *s = netdev_priv(dev);
+
+        /*
+         * initialize the hdlcdrv_state struct
+         */
+        s->ch_params = dflt_ch_params;
+        s->ptt_keyed = 0;
+
+        spin_lock_init(&s->hdlcrx.hbuf.lock);
+        s->hdlcrx.hbuf.rd = s->hdlcrx.hbuf.wr = 0;
+        s->hdlcrx.in_hdlc_rx = 0;
+        s->hdlcrx.rx_state = 0;
+        
+        spin_lock_init(&s->hdlctx.hbuf.lock);
+        s->hdlctx.hbuf.rd = s->hdlctx.hbuf.wr = 0;
+        s->hdlctx.in_hdlc_tx = 0;
+        s->hdlctx.tx_state = 1;
+        s->hdlctx.numflags = 0;
+        s->hdlctx.bitstream = s->hdlctx.bitbuf = s->hdlctx.numbits = 0;
+        s->hdlctx.ptt = 0;
+        s->hdlctx.slotcnt = s->ch_params.slottime;
+        s->hdlctx.calibrate = 0;
+
+#ifdef HDLCDRV_DEBUG
+        s->bitbuf_channel.rd = s->bitbuf_channel.wr = 0;
+        s->bitbuf_channel.shreg = 0x80;
+
+        s->bitbuf_hdlc.rd = s->bitbuf_hdlc.wr = 0;
+        s->bitbuf_hdlc.shreg = 0x80;
+#endif /* HDLCDRV_DEBUG */
+
+        /*
+         * initialize the device struct
+         */
+        dev->open = hdlcdrv_open;
+        dev->stop = hdlcdrv_close;
+        dev->do_ioctl = hdlcdrv_ioctl;
+        dev->hard_start_xmit = hdlcdrv_send_packet;
+        dev->get_stats = hdlcdrv_get_stats;
+
+        /* Fill in the fields of the device structure */
+
+        s->skb = NULL;
+        
+#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 = hdlcdrv_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);
+        dev->tx_queue_len = 16;
+}
+
+/* --------------------------------------------------------------------- */
+struct net_device *hdlcdrv_register(const struct hdlcdrv_ops *ops,
+                                    unsigned int privsize, const char *ifname,
+                                    unsigned int baseaddr, unsigned int irq, 
+                                    unsigned int dma) 
+{
+        struct net_device *dev;
+        struct hdlcdrv_state *s;
+        int err;
+
+        BUG_ON(ops == NULL);
+
+        if (privsize < sizeof(struct hdlcdrv_state))
+                privsize = sizeof(struct hdlcdrv_state);
+
+        dev = alloc_netdev(privsize, ifname, hdlcdrv_setup);
+        if (!dev)
+                return ERR_PTR(-ENOMEM);
+
+        /*
+         * initialize part of the hdlcdrv_state struct
+         */
+        s = netdev_priv(dev);
+        s->magic = HDLCDRV_MAGIC;
+        s->ops = ops;
+        dev->base_addr = baseaddr;
+        dev->irq = irq;
+        dev->dma = dma;
+
+        err = register_netdev(dev);
+        if (err < 0) {
+                printk(KERN_WARNING "hdlcdrv: cannot register net "
+                       "device %s\n", dev->name);
+                free_netdev(dev);
+                dev = ERR_PTR(err);
+        }
+        return dev;
+}
+
+/* --------------------------------------------------------------------- */
+
+void hdlcdrv_unregister(struct net_device *dev) 
+{
+        struct hdlcdrv_state *s = netdev_priv(dev);
+
+        BUG_ON(s->magic != HDLCDRV_MAGIC);
+
+        if (s->opened && s->ops->close)
+                s->ops->close(dev);
+        unregister_netdev(dev);
+        
+        free_netdev(dev);
+}
+
+/* --------------------------------------------------------------------- */
+
+EXPORT_SYMBOL(hdlcdrv_receiver);
+EXPORT_SYMBOL(hdlcdrv_transmitter);
+EXPORT_SYMBOL(hdlcdrv_arbitrate);
+EXPORT_SYMBOL(hdlcdrv_register);
+EXPORT_SYMBOL(hdlcdrv_unregister);
+
+/* --------------------------------------------------------------------- */
+
+static int __init hdlcdrv_init_driver(void)
+{
+        printk(KERN_INFO "hdlcdrv: (C) 1996-2000 Thomas Sailer HB9JNX/AE4WA\n");
+        printk(KERN_INFO "hdlcdrv: version 0.8 compiled " __TIME__ " " __DATE__ "\n");
+        return 0;
+}
+
+/* --------------------------------------------------------------------- */
+
+static void __exit hdlcdrv_cleanup_driver(void)
+{
+        printk(KERN_INFO "hdlcdrv: cleanup\n");
+}
+
+/* --------------------------------------------------------------------- */
+
+MODULE_AUTHOR("Thomas M. Sailer, sailer@ife.ee.ethz.ch, hb9jnx@hb9w.che.eu");
+MODULE_DESCRIPTION("Packet Radio network interface HDLC encoder/decoder");
+MODULE_LICENSE("GPL");
+module_init(hdlcdrv_init_driver);
+module_exit(hdlcdrv_cleanup_driver);
+
+/* --------------------------------------------------------------------- */