/*****************************************************************************/ /* * 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 ((random32() % 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->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; 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, 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); /* --------------------------------------------------------------------- */