816 lines
22 KiB
C
816 lines
22 KiB
C
/*****************************************************************************/
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/*
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* hdlcdrv.c -- HDLC packet radio network driver.
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*
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* Copyright (C) 1996-2000 Thomas Sailer (sailer@ife.ee.ethz.ch)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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* Please note that the GPL allows you to use the driver, NOT the radio.
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* In order to use the radio, you need a license from the communications
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* authority of your country.
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*
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* The driver was derived from Donald Beckers skeleton.c
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* Written 1993-94 by Donald Becker.
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*
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* History:
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* 0.1 21.09.1996 Started
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* 18.10.1996 Changed to new user space access routines
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* (copy_{to,from}_user)
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* 0.2 21.11.1996 various small changes
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* 0.3 03.03.1997 fixed (hopefully) IP not working with ax.25 as a module
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* 0.4 16.04.1997 init code/data tagged
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* 0.5 30.07.1997 made HDLC buffers bigger (solves a problem with the
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* soundmodem driver)
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* 0.6 05.04.1998 add spinlocks
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* 0.7 03.08.1999 removed some old compatibility cruft
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* 0.8 12.02.2000 adapted to softnet driver interface
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*/
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/*****************************************************************************/
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#include <linux/config.h>
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/net.h>
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#include <linux/in.h>
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#include <linux/if.h>
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#include <linux/slab.h>
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#include <linux/errno.h>
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#include <linux/init.h>
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#include <linux/bitops.h>
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#include <asm/uaccess.h>
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#include <linux/netdevice.h>
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#include <linux/if_arp.h>
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#include <linux/etherdevice.h>
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#include <linux/skbuff.h>
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#include <linux/hdlcdrv.h>
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/* prototypes for ax25_encapsulate and ax25_rebuild_header */
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#include <net/ax25.h>
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/* make genksyms happy */
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#include <linux/ip.h>
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#include <linux/udp.h>
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#include <linux/tcp.h>
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#include <linux/crc-ccitt.h>
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/* --------------------------------------------------------------------- */
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/*
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* The name of the card. Is used for messages and in the requests for
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* io regions, irqs and dma channels
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*/
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static char ax25_bcast[AX25_ADDR_LEN] =
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{'Q' << 1, 'S' << 1, 'T' << 1, ' ' << 1, ' ' << 1, ' ' << 1, '0' << 1};
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static char ax25_nocall[AX25_ADDR_LEN] =
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{'L' << 1, 'I' << 1, 'N' << 1, 'U' << 1, 'X' << 1, ' ' << 1, '1' << 1};
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/* --------------------------------------------------------------------- */
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#define KISS_VERBOSE
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/* --------------------------------------------------------------------- */
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#define PARAM_TXDELAY 1
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#define PARAM_PERSIST 2
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#define PARAM_SLOTTIME 3
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#define PARAM_TXTAIL 4
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#define PARAM_FULLDUP 5
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#define PARAM_HARDWARE 6
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#define PARAM_RETURN 255
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/* --------------------------------------------------------------------- */
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/*
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* the CRC routines are stolen from WAMPES
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* by Dieter Deyke
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*/
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/*---------------------------------------------------------------------------*/
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static inline void append_crc_ccitt(unsigned char *buffer, int len)
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{
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unsigned int crc = crc_ccitt(0xffff, buffer, len) ^ 0xffff;
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*buffer++ = crc;
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*buffer++ = crc >> 8;
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}
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/*---------------------------------------------------------------------------*/
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static inline int check_crc_ccitt(const unsigned char *buf, int cnt)
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{
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return (crc_ccitt(0xffff, buf, cnt) & 0xffff) == 0xf0b8;
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}
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/*---------------------------------------------------------------------------*/
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#if 0
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static int calc_crc_ccitt(const unsigned char *buf, int cnt)
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{
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unsigned int crc = 0xffff;
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for (; cnt > 0; cnt--)
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crc = (crc >> 8) ^ crc_ccitt_table[(crc ^ *buf++) & 0xff];
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crc ^= 0xffff;
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return (crc & 0xffff);
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}
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#endif
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/* ---------------------------------------------------------------------- */
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#define tenms_to_2flags(s,tenms) ((tenms * s->par.bitrate) / 100 / 16)
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/* ---------------------------------------------------------------------- */
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/*
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* The HDLC routines
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*/
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static int hdlc_rx_add_bytes(struct hdlcdrv_state *s, unsigned int bits,
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int num)
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{
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int added = 0;
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while (s->hdlcrx.rx_state && num >= 8) {
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if (s->hdlcrx.len >= sizeof(s->hdlcrx.buffer)) {
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s->hdlcrx.rx_state = 0;
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return 0;
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}
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*s->hdlcrx.bp++ = bits >> (32-num);
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s->hdlcrx.len++;
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num -= 8;
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added += 8;
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}
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return added;
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}
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static void hdlc_rx_flag(struct net_device *dev, struct hdlcdrv_state *s)
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{
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struct sk_buff *skb;
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int pkt_len;
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unsigned char *cp;
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if (s->hdlcrx.len < 4)
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return;
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if (!check_crc_ccitt(s->hdlcrx.buffer, s->hdlcrx.len))
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return;
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pkt_len = s->hdlcrx.len - 2 + 1; /* KISS kludge */
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if (!(skb = dev_alloc_skb(pkt_len))) {
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printk("%s: memory squeeze, dropping packet\n", dev->name);
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s->stats.rx_dropped++;
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return;
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}
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cp = skb_put(skb, pkt_len);
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*cp++ = 0; /* KISS kludge */
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memcpy(cp, s->hdlcrx.buffer, pkt_len - 1);
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skb->protocol = ax25_type_trans(skb, dev);
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netif_rx(skb);
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dev->last_rx = jiffies;
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s->stats.rx_packets++;
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}
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void hdlcdrv_receiver(struct net_device *dev, struct hdlcdrv_state *s)
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{
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int i;
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unsigned int mask1, mask2, mask3, mask4, mask5, mask6, word;
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if (!s || s->magic != HDLCDRV_MAGIC)
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return;
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if (test_and_set_bit(0, &s->hdlcrx.in_hdlc_rx))
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return;
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while (!hdlcdrv_hbuf_empty(&s->hdlcrx.hbuf)) {
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word = hdlcdrv_hbuf_get(&s->hdlcrx.hbuf);
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#ifdef HDLCDRV_DEBUG
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hdlcdrv_add_bitbuffer_word(&s->bitbuf_hdlc, word);
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#endif /* HDLCDRV_DEBUG */
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s->hdlcrx.bitstream >>= 16;
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s->hdlcrx.bitstream |= word << 16;
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s->hdlcrx.bitbuf >>= 16;
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s->hdlcrx.bitbuf |= word << 16;
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s->hdlcrx.numbits += 16;
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for(i = 15, mask1 = 0x1fc00, mask2 = 0x1fe00, mask3 = 0x0fc00,
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mask4 = 0x1f800, mask5 = 0xf800, mask6 = 0xffff;
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i >= 0;
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i--, mask1 <<= 1, mask2 <<= 1, mask3 <<= 1, mask4 <<= 1,
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mask5 <<= 1, mask6 = (mask6 << 1) | 1) {
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if ((s->hdlcrx.bitstream & mask1) == mask1)
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s->hdlcrx.rx_state = 0; /* abort received */
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else if ((s->hdlcrx.bitstream & mask2) == mask3) {
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/* flag received */
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if (s->hdlcrx.rx_state) {
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hdlc_rx_add_bytes(s, s->hdlcrx.bitbuf
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<< (8+i),
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s->hdlcrx.numbits
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-8-i);
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hdlc_rx_flag(dev, s);
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}
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s->hdlcrx.len = 0;
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s->hdlcrx.bp = s->hdlcrx.buffer;
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s->hdlcrx.rx_state = 1;
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s->hdlcrx.numbits = i;
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} else if ((s->hdlcrx.bitstream & mask4) == mask5) {
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/* stuffed bit */
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s->hdlcrx.numbits--;
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s->hdlcrx.bitbuf = (s->hdlcrx.bitbuf & (~mask6)) |
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((s->hdlcrx.bitbuf & mask6) << 1);
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}
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}
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s->hdlcrx.numbits -= hdlc_rx_add_bytes(s, s->hdlcrx.bitbuf,
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s->hdlcrx.numbits);
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}
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clear_bit(0, &s->hdlcrx.in_hdlc_rx);
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}
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/* ---------------------------------------------------------------------- */
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static inline void do_kiss_params(struct hdlcdrv_state *s,
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unsigned char *data, unsigned long len)
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{
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#ifdef KISS_VERBOSE
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#define PKP(a,b) printk(KERN_INFO "hdlcdrv.c: channel params: " a "\n", b)
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#else /* KISS_VERBOSE */
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#define PKP(a,b)
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#endif /* KISS_VERBOSE */
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if (len < 2)
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return;
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switch(data[0]) {
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case PARAM_TXDELAY:
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s->ch_params.tx_delay = data[1];
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PKP("TX delay = %ums", 10 * s->ch_params.tx_delay);
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break;
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case PARAM_PERSIST:
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s->ch_params.ppersist = data[1];
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PKP("p persistence = %u", s->ch_params.ppersist);
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break;
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case PARAM_SLOTTIME:
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s->ch_params.slottime = data[1];
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PKP("slot time = %ums", s->ch_params.slottime);
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break;
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case PARAM_TXTAIL:
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s->ch_params.tx_tail = data[1];
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PKP("TX tail = %ums", s->ch_params.tx_tail);
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break;
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case PARAM_FULLDUP:
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s->ch_params.fulldup = !!data[1];
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PKP("%s duplex", s->ch_params.fulldup ? "full" : "half");
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break;
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default:
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break;
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}
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#undef PKP
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}
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/* ---------------------------------------------------------------------- */
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void hdlcdrv_transmitter(struct net_device *dev, struct hdlcdrv_state *s)
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{
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unsigned int mask1, mask2, mask3;
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int i;
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struct sk_buff *skb;
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int pkt_len;
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if (!s || s->magic != HDLCDRV_MAGIC)
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return;
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if (test_and_set_bit(0, &s->hdlctx.in_hdlc_tx))
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return;
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for (;;) {
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if (s->hdlctx.numbits >= 16) {
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if (hdlcdrv_hbuf_full(&s->hdlctx.hbuf)) {
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clear_bit(0, &s->hdlctx.in_hdlc_tx);
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return;
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}
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hdlcdrv_hbuf_put(&s->hdlctx.hbuf, s->hdlctx.bitbuf);
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s->hdlctx.bitbuf >>= 16;
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s->hdlctx.numbits -= 16;
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}
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switch (s->hdlctx.tx_state) {
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default:
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clear_bit(0, &s->hdlctx.in_hdlc_tx);
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return;
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case 0:
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case 1:
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if (s->hdlctx.numflags) {
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s->hdlctx.numflags--;
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s->hdlctx.bitbuf |=
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0x7e7e << s->hdlctx.numbits;
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s->hdlctx.numbits += 16;
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break;
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}
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if (s->hdlctx.tx_state == 1) {
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clear_bit(0, &s->hdlctx.in_hdlc_tx);
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return;
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}
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if (!(skb = s->skb)) {
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int flgs = tenms_to_2flags(s, s->ch_params.tx_tail);
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if (flgs < 2)
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flgs = 2;
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s->hdlctx.tx_state = 1;
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s->hdlctx.numflags = flgs;
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break;
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}
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s->skb = NULL;
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netif_wake_queue(dev);
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pkt_len = skb->len-1; /* strip KISS byte */
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if (pkt_len >= HDLCDRV_MAXFLEN || pkt_len < 2) {
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s->hdlctx.tx_state = 0;
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s->hdlctx.numflags = 1;
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dev_kfree_skb_irq(skb);
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break;
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}
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memcpy(s->hdlctx.buffer, skb->data+1, pkt_len);
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dev_kfree_skb_irq(skb);
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s->hdlctx.bp = s->hdlctx.buffer;
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append_crc_ccitt(s->hdlctx.buffer, pkt_len);
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s->hdlctx.len = pkt_len+2; /* the appended CRC */
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s->hdlctx.tx_state = 2;
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s->hdlctx.bitstream = 0;
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s->stats.tx_packets++;
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break;
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case 2:
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if (!s->hdlctx.len) {
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s->hdlctx.tx_state = 0;
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s->hdlctx.numflags = 1;
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break;
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}
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s->hdlctx.len--;
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s->hdlctx.bitbuf |= *s->hdlctx.bp <<
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s->hdlctx.numbits;
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s->hdlctx.bitstream >>= 8;
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s->hdlctx.bitstream |= (*s->hdlctx.bp++) << 16;
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mask1 = 0x1f000;
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mask2 = 0x10000;
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mask3 = 0xffffffff >> (31-s->hdlctx.numbits);
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s->hdlctx.numbits += 8;
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for(i = 0; i < 8; i++, mask1 <<= 1, mask2 <<= 1,
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mask3 = (mask3 << 1) | 1) {
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if ((s->hdlctx.bitstream & mask1) != mask1)
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continue;
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s->hdlctx.bitstream &= ~mask2;
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s->hdlctx.bitbuf =
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(s->hdlctx.bitbuf & mask3) |
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((s->hdlctx.bitbuf &
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(~mask3)) << 1);
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s->hdlctx.numbits++;
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mask3 = (mask3 << 1) | 1;
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}
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break;
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}
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}
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}
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/* ---------------------------------------------------------------------- */
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static void start_tx(struct net_device *dev, struct hdlcdrv_state *s)
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{
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s->hdlctx.tx_state = 0;
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s->hdlctx.numflags = tenms_to_2flags(s, s->ch_params.tx_delay);
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s->hdlctx.bitbuf = s->hdlctx.bitstream = s->hdlctx.numbits = 0;
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hdlcdrv_transmitter(dev, s);
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s->hdlctx.ptt = 1;
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s->ptt_keyed++;
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}
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/* ---------------------------------------------------------------------- */
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static unsigned short random_seed;
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static inline unsigned short random_num(void)
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{
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random_seed = 28629 * random_seed + 157;
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return random_seed;
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}
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/* ---------------------------------------------------------------------- */
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void hdlcdrv_arbitrate(struct net_device *dev, struct hdlcdrv_state *s)
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{
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if (!s || s->magic != HDLCDRV_MAGIC || s->hdlctx.ptt || !s->skb)
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return;
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if (s->ch_params.fulldup) {
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start_tx(dev, s);
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return;
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}
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if (s->hdlcrx.dcd) {
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s->hdlctx.slotcnt = s->ch_params.slottime;
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return;
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}
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if ((--s->hdlctx.slotcnt) > 0)
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return;
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s->hdlctx.slotcnt = s->ch_params.slottime;
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if ((random_num() % 256) > s->ch_params.ppersist)
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return;
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start_tx(dev, s);
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}
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/* --------------------------------------------------------------------- */
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/*
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* ===================== network driver interface =========================
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*/
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static int hdlcdrv_send_packet(struct sk_buff *skb, struct net_device *dev)
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{
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struct hdlcdrv_state *sm = netdev_priv(dev);
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if (skb->data[0] != 0) {
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do_kiss_params(sm, skb->data, skb->len);
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dev_kfree_skb(skb);
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return 0;
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}
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if (sm->skb)
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return -1;
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netif_stop_queue(dev);
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sm->skb = skb;
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return 0;
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}
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/* --------------------------------------------------------------------- */
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static int hdlcdrv_set_mac_address(struct net_device *dev, void *addr)
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{
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struct sockaddr *sa = (struct sockaddr *)addr;
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/* addr is an AX.25 shifted ASCII mac address */
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memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
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return 0;
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}
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/* --------------------------------------------------------------------- */
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static struct net_device_stats *hdlcdrv_get_stats(struct net_device *dev)
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{
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struct hdlcdrv_state *sm = netdev_priv(dev);
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/*
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* Get the current statistics. This may be called with the
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* card open or closed.
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*/
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return &sm->stats;
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}
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/* --------------------------------------------------------------------- */
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/*
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* Open/initialize the board. This is called (in the current kernel)
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* sometime after booting when the 'ifconfig' program is run.
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*
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* This routine should set everything up anew at each open, even
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* registers that "should" only need to be set once at boot, so that
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* there is non-reboot way to recover if something goes wrong.
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*/
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static int hdlcdrv_open(struct net_device *dev)
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{
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struct hdlcdrv_state *s = netdev_priv(dev);
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int i;
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if (!s->ops || !s->ops->open)
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return -ENODEV;
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/*
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* initialise some variables
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*/
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s->opened = 1;
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s->hdlcrx.hbuf.rd = s->hdlcrx.hbuf.wr = 0;
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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);
|
|
|
|
/* --------------------------------------------------------------------- */
|