v4.19.13 snapshot.
diff --git a/include/linux/hdlcdrv.h b/include/linux/hdlcdrv.h
new file mode 100644
index 0000000..d4d633a
--- /dev/null
+++ b/include/linux/hdlcdrv.h
@@ -0,0 +1,276 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * hdlcdrv.h -- HDLC packet radio network driver.
+ * The Linux soundcard driver for 1200 baud and 9600 baud packet radio
+ * (C) 1996-1998 by Thomas Sailer, HB9JNX/AE4WA
+ */
+#ifndef _HDLCDRV_H
+#define _HDLCDRV_H
+
+
+#include <linux/netdevice.h>
+#include <linux/if.h>
+#include <linux/spinlock.h>
+#include <uapi/linux/hdlcdrv.h>
+
+#define HDLCDRV_MAGIC 0x5ac6e778
+#define HDLCDRV_HDLCBUFFER 32 /* should be a power of 2 for speed reasons */
+#define HDLCDRV_BITBUFFER 256 /* should be a power of 2 for speed reasons */
+#undef HDLCDRV_LOOPBACK /* define for HDLC debugging purposes */
+#define HDLCDRV_DEBUG
+
+/* maximum packet length, excluding CRC */
+#define HDLCDRV_MAXFLEN 400
+
+
+struct hdlcdrv_hdlcbuffer {
+ spinlock_t lock;
+ unsigned rd, wr;
+ unsigned short buf[HDLCDRV_HDLCBUFFER];
+};
+
+#ifdef HDLCDRV_DEBUG
+struct hdlcdrv_bitbuffer {
+ unsigned int rd;
+ unsigned int wr;
+ unsigned int shreg;
+ unsigned char buffer[HDLCDRV_BITBUFFER];
+};
+
+static inline void hdlcdrv_add_bitbuffer(struct hdlcdrv_bitbuffer *buf,
+ unsigned int bit)
+{
+ unsigned char new;
+
+ new = buf->shreg & 1;
+ buf->shreg >>= 1;
+ buf->shreg |= (!!bit) << 7;
+ if (new) {
+ buf->buffer[buf->wr] = buf->shreg;
+ buf->wr = (buf->wr+1) % sizeof(buf->buffer);
+ buf->shreg = 0x80;
+ }
+}
+
+static inline void hdlcdrv_add_bitbuffer_word(struct hdlcdrv_bitbuffer *buf,
+ unsigned int bits)
+{
+ buf->buffer[buf->wr] = bits & 0xff;
+ buf->wr = (buf->wr+1) % sizeof(buf->buffer);
+ buf->buffer[buf->wr] = (bits >> 8) & 0xff;
+ buf->wr = (buf->wr+1) % sizeof(buf->buffer);
+
+}
+#endif /* HDLCDRV_DEBUG */
+
+/* -------------------------------------------------------------------- */
+/*
+ * Information that need to be kept for each driver.
+ */
+
+struct hdlcdrv_ops {
+ /*
+ * first some informations needed by the hdlcdrv routines
+ */
+ const char *drvname;
+ const char *drvinfo;
+ /*
+ * the routines called by the hdlcdrv routines
+ */
+ int (*open)(struct net_device *);
+ int (*close)(struct net_device *);
+ int (*ioctl)(struct net_device *, struct ifreq *,
+ struct hdlcdrv_ioctl *, int);
+};
+
+struct hdlcdrv_state {
+ int magic;
+ int opened;
+
+ const struct hdlcdrv_ops *ops;
+
+ struct {
+ int bitrate;
+ } par;
+
+ struct hdlcdrv_pttoutput {
+ int dma2;
+ int seriobase;
+ int pariobase;
+ int midiiobase;
+ unsigned int flags;
+ } ptt_out;
+
+ struct hdlcdrv_channel_params ch_params;
+
+ struct hdlcdrv_hdlcrx {
+ struct hdlcdrv_hdlcbuffer hbuf;
+ unsigned long in_hdlc_rx;
+ /* 0 = sync hunt, != 0 receiving */
+ int rx_state;
+ unsigned int bitstream;
+ unsigned int bitbuf;
+ int numbits;
+ unsigned char dcd;
+
+ int len;
+ unsigned char *bp;
+ unsigned char buffer[HDLCDRV_MAXFLEN+2];
+ } hdlcrx;
+
+ struct hdlcdrv_hdlctx {
+ struct hdlcdrv_hdlcbuffer hbuf;
+ unsigned long in_hdlc_tx;
+ /*
+ * 0 = send flags
+ * 1 = send txtail (flags)
+ * 2 = send packet
+ */
+ int tx_state;
+ int numflags;
+ unsigned int bitstream;
+ unsigned char ptt;
+ int calibrate;
+ int slotcnt;
+
+ unsigned int bitbuf;
+ int numbits;
+
+ int len;
+ unsigned char *bp;
+ unsigned char buffer[HDLCDRV_MAXFLEN+2];
+ } hdlctx;
+
+#ifdef HDLCDRV_DEBUG
+ struct hdlcdrv_bitbuffer bitbuf_channel;
+ struct hdlcdrv_bitbuffer bitbuf_hdlc;
+#endif /* HDLCDRV_DEBUG */
+
+ int ptt_keyed;
+
+ /* queued skb for transmission */
+ struct sk_buff *skb;
+};
+
+
+/* -------------------------------------------------------------------- */
+
+static inline int hdlcdrv_hbuf_full(struct hdlcdrv_hdlcbuffer *hb)
+{
+ unsigned long flags;
+ int ret;
+
+ spin_lock_irqsave(&hb->lock, flags);
+ ret = !((HDLCDRV_HDLCBUFFER - 1 + hb->rd - hb->wr) % HDLCDRV_HDLCBUFFER);
+ spin_unlock_irqrestore(&hb->lock, flags);
+ return ret;
+}
+
+/* -------------------------------------------------------------------- */
+
+static inline int hdlcdrv_hbuf_empty(struct hdlcdrv_hdlcbuffer *hb)
+{
+ unsigned long flags;
+ int ret;
+
+ spin_lock_irqsave(&hb->lock, flags);
+ ret = (hb->rd == hb->wr);
+ spin_unlock_irqrestore(&hb->lock, flags);
+ return ret;
+}
+
+/* -------------------------------------------------------------------- */
+
+static inline unsigned short hdlcdrv_hbuf_get(struct hdlcdrv_hdlcbuffer *hb)
+{
+ unsigned long flags;
+ unsigned short val;
+ unsigned newr;
+
+ spin_lock_irqsave(&hb->lock, flags);
+ if (hb->rd == hb->wr)
+ val = 0;
+ else {
+ newr = (hb->rd+1) % HDLCDRV_HDLCBUFFER;
+ val = hb->buf[hb->rd];
+ hb->rd = newr;
+ }
+ spin_unlock_irqrestore(&hb->lock, flags);
+ return val;
+}
+
+/* -------------------------------------------------------------------- */
+
+static inline void hdlcdrv_hbuf_put(struct hdlcdrv_hdlcbuffer *hb,
+ unsigned short val)
+{
+ unsigned newp;
+ unsigned long flags;
+
+ spin_lock_irqsave(&hb->lock, flags);
+ newp = (hb->wr+1) % HDLCDRV_HDLCBUFFER;
+ if (newp != hb->rd) {
+ hb->buf[hb->wr] = val & 0xffff;
+ hb->wr = newp;
+ }
+ spin_unlock_irqrestore(&hb->lock, flags);
+}
+
+/* -------------------------------------------------------------------- */
+
+static inline void hdlcdrv_putbits(struct hdlcdrv_state *s, unsigned int bits)
+{
+ hdlcdrv_hbuf_put(&s->hdlcrx.hbuf, bits);
+}
+
+static inline unsigned int hdlcdrv_getbits(struct hdlcdrv_state *s)
+{
+ unsigned int ret;
+
+ if (hdlcdrv_hbuf_empty(&s->hdlctx.hbuf)) {
+ if (s->hdlctx.calibrate > 0)
+ s->hdlctx.calibrate--;
+ else
+ s->hdlctx.ptt = 0;
+ ret = 0;
+ } else
+ ret = hdlcdrv_hbuf_get(&s->hdlctx.hbuf);
+#ifdef HDLCDRV_LOOPBACK
+ hdlcdrv_hbuf_put(&s->hdlcrx.hbuf, ret);
+#endif /* HDLCDRV_LOOPBACK */
+ return ret;
+}
+
+static inline void hdlcdrv_channelbit(struct hdlcdrv_state *s, unsigned int bit)
+{
+#ifdef HDLCDRV_DEBUG
+ hdlcdrv_add_bitbuffer(&s->bitbuf_channel, bit);
+#endif /* HDLCDRV_DEBUG */
+}
+
+static inline void hdlcdrv_setdcd(struct hdlcdrv_state *s, int dcd)
+{
+ s->hdlcrx.dcd = !!dcd;
+}
+
+static inline int hdlcdrv_ptt(struct hdlcdrv_state *s)
+{
+ return s->hdlctx.ptt || (s->hdlctx.calibrate > 0);
+}
+
+/* -------------------------------------------------------------------- */
+
+void hdlcdrv_receiver(struct net_device *, struct hdlcdrv_state *);
+void hdlcdrv_transmitter(struct net_device *, struct hdlcdrv_state *);
+void hdlcdrv_arbitrate(struct net_device *, struct hdlcdrv_state *);
+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);
+void hdlcdrv_unregister(struct net_device *dev);
+
+/* -------------------------------------------------------------------- */
+
+
+
+#endif /* _HDLCDRV_H */