277 lines
6.3 KiB
C
277 lines
6.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* hdlcdrv.h -- HDLC packet radio network driver.
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* The Linux soundcard driver for 1200 baud and 9600 baud packet radio
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* (C) 1996-1998 by Thomas Sailer, HB9JNX/AE4WA
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*/
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#ifndef _HDLCDRV_H
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#define _HDLCDRV_H
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#include <linux/netdevice.h>
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#include <linux/if.h>
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#include <linux/spinlock.h>
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#include <uapi/linux/hdlcdrv.h>
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#define HDLCDRV_MAGIC 0x5ac6e778
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#define HDLCDRV_HDLCBUFFER 32 /* should be a power of 2 for speed reasons */
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#define HDLCDRV_BITBUFFER 256 /* should be a power of 2 for speed reasons */
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#undef HDLCDRV_LOOPBACK /* define for HDLC debugging purposes */
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#define HDLCDRV_DEBUG
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/* maximum packet length, excluding CRC */
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#define HDLCDRV_MAXFLEN 400
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struct hdlcdrv_hdlcbuffer {
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spinlock_t lock;
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unsigned rd, wr;
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unsigned short buf[HDLCDRV_HDLCBUFFER];
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};
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#ifdef HDLCDRV_DEBUG
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struct hdlcdrv_bitbuffer {
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unsigned int rd;
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unsigned int wr;
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unsigned int shreg;
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unsigned char buffer[HDLCDRV_BITBUFFER];
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};
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static inline void hdlcdrv_add_bitbuffer(struct hdlcdrv_bitbuffer *buf,
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unsigned int bit)
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{
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unsigned char new;
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new = buf->shreg & 1;
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buf->shreg >>= 1;
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buf->shreg |= (!!bit) << 7;
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if (new) {
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buf->buffer[buf->wr] = buf->shreg;
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buf->wr = (buf->wr+1) % sizeof(buf->buffer);
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buf->shreg = 0x80;
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}
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}
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static inline void hdlcdrv_add_bitbuffer_word(struct hdlcdrv_bitbuffer *buf,
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unsigned int bits)
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{
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buf->buffer[buf->wr] = bits & 0xff;
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buf->wr = (buf->wr+1) % sizeof(buf->buffer);
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buf->buffer[buf->wr] = (bits >> 8) & 0xff;
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buf->wr = (buf->wr+1) % sizeof(buf->buffer);
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}
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#endif /* HDLCDRV_DEBUG */
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/* -------------------------------------------------------------------- */
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/*
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* Information that need to be kept for each driver.
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*/
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struct hdlcdrv_ops {
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/*
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* first some informations needed by the hdlcdrv routines
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*/
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const char *drvname;
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const char *drvinfo;
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/*
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* the routines called by the hdlcdrv routines
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*/
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int (*open)(struct net_device *);
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int (*close)(struct net_device *);
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int (*ioctl)(struct net_device *, struct ifreq *,
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struct hdlcdrv_ioctl *, int);
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};
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struct hdlcdrv_state {
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int magic;
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int opened;
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const struct hdlcdrv_ops *ops;
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struct {
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int bitrate;
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} par;
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struct hdlcdrv_pttoutput {
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int dma2;
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int seriobase;
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int pariobase;
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int midiiobase;
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unsigned int flags;
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} ptt_out;
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struct hdlcdrv_channel_params ch_params;
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struct hdlcdrv_hdlcrx {
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struct hdlcdrv_hdlcbuffer hbuf;
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unsigned long in_hdlc_rx;
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/* 0 = sync hunt, != 0 receiving */
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int rx_state;
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unsigned int bitstream;
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unsigned int bitbuf;
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int numbits;
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unsigned char dcd;
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int len;
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unsigned char *bp;
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unsigned char buffer[HDLCDRV_MAXFLEN+2];
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} hdlcrx;
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struct hdlcdrv_hdlctx {
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struct hdlcdrv_hdlcbuffer hbuf;
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unsigned long in_hdlc_tx;
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/*
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* 0 = send flags
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* 1 = send txtail (flags)
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* 2 = send packet
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*/
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int tx_state;
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int numflags;
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unsigned int bitstream;
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unsigned char ptt;
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int calibrate;
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int slotcnt;
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unsigned int bitbuf;
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int numbits;
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int len;
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unsigned char *bp;
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unsigned char buffer[HDLCDRV_MAXFLEN+2];
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} hdlctx;
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#ifdef HDLCDRV_DEBUG
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struct hdlcdrv_bitbuffer bitbuf_channel;
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struct hdlcdrv_bitbuffer bitbuf_hdlc;
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#endif /* HDLCDRV_DEBUG */
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int ptt_keyed;
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/* queued skb for transmission */
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struct sk_buff *skb;
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};
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/* -------------------------------------------------------------------- */
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static inline int hdlcdrv_hbuf_full(struct hdlcdrv_hdlcbuffer *hb)
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{
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unsigned long flags;
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int ret;
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spin_lock_irqsave(&hb->lock, flags);
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ret = !((HDLCDRV_HDLCBUFFER - 1 + hb->rd - hb->wr) % HDLCDRV_HDLCBUFFER);
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spin_unlock_irqrestore(&hb->lock, flags);
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return ret;
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}
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/* -------------------------------------------------------------------- */
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static inline int hdlcdrv_hbuf_empty(struct hdlcdrv_hdlcbuffer *hb)
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{
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unsigned long flags;
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int ret;
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spin_lock_irqsave(&hb->lock, flags);
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ret = (hb->rd == hb->wr);
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spin_unlock_irqrestore(&hb->lock, flags);
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return ret;
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}
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/* -------------------------------------------------------------------- */
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static inline unsigned short hdlcdrv_hbuf_get(struct hdlcdrv_hdlcbuffer *hb)
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{
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unsigned long flags;
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unsigned short val;
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unsigned newr;
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spin_lock_irqsave(&hb->lock, flags);
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if (hb->rd == hb->wr)
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val = 0;
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else {
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newr = (hb->rd+1) % HDLCDRV_HDLCBUFFER;
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val = hb->buf[hb->rd];
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hb->rd = newr;
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}
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spin_unlock_irqrestore(&hb->lock, flags);
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return val;
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}
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/* -------------------------------------------------------------------- */
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static inline void hdlcdrv_hbuf_put(struct hdlcdrv_hdlcbuffer *hb,
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unsigned short val)
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{
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unsigned newp;
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unsigned long flags;
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spin_lock_irqsave(&hb->lock, flags);
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newp = (hb->wr+1) % HDLCDRV_HDLCBUFFER;
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if (newp != hb->rd) {
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hb->buf[hb->wr] = val & 0xffff;
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hb->wr = newp;
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}
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spin_unlock_irqrestore(&hb->lock, flags);
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}
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/* -------------------------------------------------------------------- */
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static inline void hdlcdrv_putbits(struct hdlcdrv_state *s, unsigned int bits)
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{
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hdlcdrv_hbuf_put(&s->hdlcrx.hbuf, bits);
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}
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static inline unsigned int hdlcdrv_getbits(struct hdlcdrv_state *s)
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{
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unsigned int ret;
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if (hdlcdrv_hbuf_empty(&s->hdlctx.hbuf)) {
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if (s->hdlctx.calibrate > 0)
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s->hdlctx.calibrate--;
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else
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s->hdlctx.ptt = 0;
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ret = 0;
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} else
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ret = hdlcdrv_hbuf_get(&s->hdlctx.hbuf);
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#ifdef HDLCDRV_LOOPBACK
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hdlcdrv_hbuf_put(&s->hdlcrx.hbuf, ret);
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#endif /* HDLCDRV_LOOPBACK */
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return ret;
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}
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static inline void hdlcdrv_channelbit(struct hdlcdrv_state *s, unsigned int bit)
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{
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#ifdef HDLCDRV_DEBUG
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hdlcdrv_add_bitbuffer(&s->bitbuf_channel, bit);
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#endif /* HDLCDRV_DEBUG */
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}
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static inline void hdlcdrv_setdcd(struct hdlcdrv_state *s, int dcd)
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{
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s->hdlcrx.dcd = !!dcd;
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}
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static inline int hdlcdrv_ptt(struct hdlcdrv_state *s)
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{
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return s->hdlctx.ptt || (s->hdlctx.calibrate > 0);
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}
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/* -------------------------------------------------------------------- */
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void hdlcdrv_receiver(struct net_device *, struct hdlcdrv_state *);
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void hdlcdrv_transmitter(struct net_device *, struct hdlcdrv_state *);
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void hdlcdrv_arbitrate(struct net_device *, struct hdlcdrv_state *);
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struct net_device *hdlcdrv_register(const struct hdlcdrv_ops *ops,
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unsigned int privsize, const char *ifname,
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unsigned int baseaddr, unsigned int irq,
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unsigned int dma);
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void hdlcdrv_unregister(struct net_device *dev);
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/* -------------------------------------------------------------------- */
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#endif /* _HDLCDRV_H */
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