--- /dev/null
+/*****************************************************************************/
+
+/*
+ * 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/capability.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/net.h>
+#include <linux/in.h>
+#include <linux/if.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/bitops.h>
+
+#include <linux/netdevice.h>
+#include <linux/if_arp.h>
+#include <linux/skbuff.h>
+#include <linux/hdlcdrv.h>
+#include <linux/random.h>
+#include <net/ax25.h>
+#include <asm/uaccess.h>
+
+#include <linux/crc-ccitt.h>
+
+/* --------------------------------------------------------------------- */
+
+#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 += len;
+ *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);
+ dev->stats.rx_dropped++;
+ return;
+ }
+ cp = skb_put(skb, pkt_len);
+ *cp++ = 0; /* KISS kludge */
+ memcpy(cp, s->hdlcrx.buffer, pkt_len - 1);
+ skb->protocol = ax25_type_trans(skb, dev);
+ netif_rx(skb);
+ dev->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;
+ }
+ skb_copy_from_linear_data_offset(skb, 1,
+ s->hdlctx.buffer,
+ 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;
+ dev->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++;
+}
+
+/* ---------------------------------------------------------------------- */
+
+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 ((prandom_u32() % 256) > s->ch_params.ppersist)
+ return;
+ start_tx(dev, s);
+}
+
+/* --------------------------------------------------------------------- */
+/*
+ * ===================== network driver interface =========================
+ */
+
+static netdev_tx_t hdlcdrv_send_packet(struct sk_buff *skb,
+ struct net_device *dev)
+{
+ struct hdlcdrv_state *sm = netdev_priv(dev);
+
+ if (skb->protocol == htons(ETH_P_IP))
+ return ax25_ip_xmit(skb);
+
+ if (skb->data[0] != 0) {
+ do_kiss_params(sm, skb->data, skb->len);
+ dev_kfree_skb(skb);
+ return NETDEV_TX_OK;
+ }
+ if (sm->skb)
+ return NETDEV_TX_LOCKED;
+ netif_stop_queue(dev);
+ sm->skb = skb;
+ return NETDEV_TX_OK;
+}
+
+/* --------------------------------------------------------------------- */
+
+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;
+}
+
+/* --------------------------------------------------------------------- */
+/*
+ * 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 = dev->stats.tx_packets;
+ bi.data.cs.tx_errors = dev->stats.tx_errors;
+ bi.data.cs.rx_packets = dev->stats.rx_packets;
+ bi.data.cs.rx_errors = dev->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;
+ if (bi.data.calibrate > INT_MAX / s->par.bitrate)
+ return -EINVAL;
+ 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;
+
+}
+
+/* --------------------------------------------------------------------- */
+
+static const struct net_device_ops hdlcdrv_netdev = {
+ .ndo_open = hdlcdrv_open,
+ .ndo_stop = hdlcdrv_close,
+ .ndo_start_xmit = hdlcdrv_send_packet,
+ .ndo_do_ioctl = hdlcdrv_ioctl,
+ .ndo_set_mac_address = hdlcdrv_set_mac_address,
+};
+
+/*
+ * 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 */
+
+
+ /* Fill in the fields of the device structure */
+
+ s->skb = NULL;
+
+ dev->netdev_ops = &hdlcdrv_netdev;
+ dev->header_ops = &ax25_header_ops;
+
+ 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_defaddr, 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, NET_NAME_UNKNOWN, 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\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);
+
+/* --------------------------------------------------------------------- */
Code Review / kvmfornfv.git / blobdiff