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ISDN: Add support for none reverse bitstreams to isdnhdc

Browse source 
The original isdnhdlc code was developed for devices which had
reversed bitorder in the byte stream. Adding code to handle normal
bitstreams as well.

Signed-off-by: Karsten Keil <keil@b1-systems.de>
This commit is contained in:
Karsten Keil 2009-07-08 20:31:42 +02:00
parent 6bd4bcd3cd
commit c38fc3bc2e
5 changed files with 56 additions and 44 deletions
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5
drivers/isdn/hisax/st5481_b.c
View file

@ -218,7 +218,10 @@ static void st5481B_mode(struct st5481_bcs *bcs, int mode)
if (bcs->mode != L1_MODE_NULL) {
// Open the B channel
if (bcs->mode != L1_MODE_TRANS) {
isdnhdlc_out_init(&b_out->hdlc_state, 0, bcs->mode == L1_MODE_HDLC_56K);
u32 features = HDLC_BITREVERSE;
if (bcs->mode == L1_MODE_HDLC_56K)
features |= HDLC_56KBIT;
isdnhdlc_out_init(&b_out->hdlc_state, features);
}
st5481_usb_pipe_reset(adapter, (bcs->channel+1)*2, NULL, NULL);

2
drivers/isdn/hisax/st5481_d.c
View file

@ -417,7 +417,7 @@ static void dout_start_xmit(struct FsmInst *fsm, int event, void *arg)
DBG(2,"len=%d",skb->len);
isdnhdlc_out_init(&d_out->hdlc_state, 1, 0);
isdnhdlc_out_init(&d_out->hdlc_state, HDLC_DCHANNEL | HDLC_BITREVERSE);
if (test_and_set_bit(buf_nr, &d_out->busy)) {
WARNING("ep %d urb %d busy %#lx", EP_D_OUT, buf_nr, d_out->busy);

11
drivers/isdn/hisax/st5481_usb.c
View file

@ -637,10 +637,13 @@ void st5481_in_mode(struct st5481_in *in, int mode)
usb_unlink_urb(in->urb[1]);
if (in->mode != L1_MODE_NULL) {
if (in->mode != L1_MODE_TRANS)
isdnhdlc_rcv_init(&in->hdlc_state,
in->mode == L1_MODE_HDLC_56K);
if (in->mode != L1_MODE_TRANS) {
u32 features = HDLC_BITREVERSE;
if (in->mode == L1_MODE_HDLC_56K)
features |= HDLC_56KBIT;
isdnhdlc_rcv_init(&in->hdlc_state, features);
}
st5481_usb_pipe_reset(in->adapter, in->ep, NULL, NULL);
st5481_usb_device_ctrl_msg(in->adapter, in->counter,
in->packet_size,

70
drivers/isdn/i4l/isdnhdlc.c
View file

@ -2,6 +2,7 @@
* isdnhdlc.c -- General purpose ISDN HDLC decoder.
*
* Copyright (C)
* 2009 Karsten Keil <keil@b1-systems.de>
* 2002 Wolfgang Mües <wolfgang@iksw-muees.de>
* 2001 Frode Isaksen <fisaksen@bewan.com>
* 2001 Kai Germaschewski <kai.germaschewski@gmx.de>
@ -25,6 +26,7 @@
#include <linux/init.h>
#include <linux/crc-ccitt.h>
#include <linux/isdn/hdlc.h>
#include <linux/bitrev.h>
/*-------------------------------------------------------------------*/
@ -48,35 +50,21 @@ enum {
HDLC_SENDFLAG_B1A6, HDLC_SENDFLAG_B7, STOPPED
};
void isdnhdlc_rcv_init(struct isdnhdlc_vars *hdlc, int do_adapt56)
void isdnhdlc_rcv_init(struct isdnhdlc_vars *hdlc, u32 features)
{
hdlc->bit_shift = 0;
hdlc->hdlc_bits1 = 0;
hdlc->data_bits = 0;
hdlc->ffbit_shift = 0;
hdlc->data_received = 0;
memset(hdlc, 0, sizeof(struct isdnhdlc_vars));
hdlc->state = HDLC_GET_DATA;
hdlc->do_adapt56 = do_adapt56;
hdlc->dchannel = 0;
hdlc->crc = 0;
hdlc->cbin = 0;
hdlc->shift_reg = 0;
hdlc->ffvalue = 0;
hdlc->dstpos = 0;
if (features & HDLC_56KBIT)
hdlc->do_adapt56 = 1;
if (features & HDLC_BITREVERSE)
hdlc->do_bitreverse = 1;
}
EXPORT_SYMBOL(isdnhdlc_out_init);
void isdnhdlc_out_init(struct isdnhdlc_vars *hdlc, int is_d_channel,
int do_adapt56)
void isdnhdlc_out_init(struct isdnhdlc_vars *hdlc, u32 features)
{
hdlc->bit_shift = 0;
hdlc->hdlc_bits1 = 0;
hdlc->data_bits = 0;
hdlc->ffbit_shift = 0;
hdlc->data_received = 0;
hdlc->do_closing = 0;
hdlc->ffvalue = 0;
if (is_d_channel) {
memset(hdlc, 0, sizeof(struct isdnhdlc_vars));
if (features & HDLC_DCHANNEL) {
hdlc->dchannel = 1;
hdlc->state = HDLC_SEND_FIRST_FLAG;
} else {
@ -85,16 +73,13 @@ void isdnhdlc_out_init(struct isdnhdlc_vars *hdlc, int is_d_channel,
hdlc->ffvalue = 0x7e;
}
hdlc->cbin = 0x7e;
hdlc->bit_shift = 0;
if (do_adapt56) {
if (features & HDLC_56KBIT) {
hdlc->do_adapt56 = 1;
hdlc->data_bits = 0;
hdlc->state = HDLC_SENDFLAG_B0;
} else {
hdlc->do_adapt56 = 0;
} else
hdlc->data_bits = 8;
}
hdlc->shift_reg = 0;
if (features & HDLC_BITREVERSE)
hdlc->do_bitreverse = 1;
}
EXPORT_SYMBOL(isdnhdlc_rcv_init);
@ -188,7 +173,11 @@ int isdnhdlc_decode(struct isdnhdlc_vars *hdlc, const u8 *src, int slen,
while (slen > 0) {
if (hdlc->bit_shift == 0) {
hdlc->cbin = *src++;
/* the code is for bitreverse streams */
if (hdlc->do_bitreverse == 0)
hdlc->cbin = bitrev8(*src++);
else
hdlc->cbin = *src++;
slen--;
hdlc->bit_shift = 8;
if (hdlc->do_adapt56)
@ -405,12 +394,15 @@ int isdnhdlc_encode(struct isdnhdlc_vars *hdlc, const u8 *src, u16 slen,
case STOPPED:
while (dsize--)
*dst++ = 0xff;
return dsize;
case HDLC_SEND_FAST_FLAG:
hdlc->do_closing = 0;
if (slen == 0) {
*dst++ = hdlc->ffvalue;
/* the code is for bitreverse streams */
if (hdlc->do_bitreverse == 0)
*dst++ = bitrev8(hdlc->ffvalue);
else
*dst++ = hdlc->ffvalue;
len++;
dsize--;
break;
@ -594,7 +586,11 @@ int isdnhdlc_encode(struct isdnhdlc_vars *hdlc, const u8 *src, u16 slen,
hdlc->cbin = 0x7e;
hdlc->state = HDLC_SEND_FIRST_FLAG;
} else {
*dst++ = hdlc->cbin;
/* the code is for bitreverse streams */
if (hdlc->do_bitreverse == 0)
*dst++ = bitrev8(hdlc->cbin);
else
*dst++ = hdlc->cbin;
hdlc->bit_shift = 0;
hdlc->data_bits = 0;
len++;
@ -612,7 +608,11 @@ int isdnhdlc_encode(struct isdnhdlc_vars *hdlc, const u8 *src, u16 slen,
}
}
if (hdlc->data_bits == 8) {
*dst++ = hdlc->cbin;
/* the code is for bitreverse streams */
if (hdlc->do_bitreverse == 0)
*dst++ = bitrev8(hdlc->cbin);
else
*dst++ = hdlc->cbin;
hdlc->data_bits = 0;
len++;
dsize--;

12
include/linux/isdn/hdlc.h
View file

@ -6,6 +6,7 @@
* controllers.
*
* Copyright (C)
* 2009 Karsten Keil <keil@b1-systems.de>
* 2002 Wolfgang Mües <wolfgang@iksw-muees.de>
* 2001 Frode Isaksen <fisaksen@bewan.com>
* 2001 Kai Germaschewski <kai.germaschewski@gmx.de>
@ -50,8 +51,14 @@ struct isdnhdlc_vars {
u32 do_adapt56:1;
/* set if in closing phase (need to send CRC + flag) */
u32 do_closing:1;
/* set if data is bitreverse */
u32 do_bitreverse:1;
};
/* Feature Flags */
#define HDLC_56KBIT 0x01
#define HDLC_DCHANNEL 0x02
#define HDLC_BITREVERSE 0x04
/*
The return value from isdnhdlc_decode is
@ -62,13 +69,12 @@ struct isdnhdlc_vars {
#define HDLC_CRC_ERROR 2
#define HDLC_LENGTH_ERROR 3
extern void isdnhdlc_rcv_init(struct isdnhdlc_vars *hdlc, int do_adapt56);
extern void isdnhdlc_rcv_init(struct isdnhdlc_vars *hdlc, u32 features);
extern int isdnhdlc_decode(struct isdnhdlc_vars *hdlc, const u8 *src,
int slen, int *count, u8 *dst, int dsize);
extern void isdnhdlc_out_init(struct isdnhdlc_vars *hdlc, int is_d_channel,
int do_adapt56);
extern void isdnhdlc_out_init(struct isdnhdlc_vars *hdlc, u32 features);
extern int isdnhdlc_encode(struct isdnhdlc_vars *hdlc, const u8 *src,
u16 slen, int *count, u8 *dst, int dsize);