diff options
author | Arnd Bergmann <arnd@arndb.de> | 2019-04-18 22:57:08 +0200 |
---|---|---|
committer | Arnd Bergmann <arnd@arndb.de> | 2019-05-31 11:13:10 +0200 |
commit | 99c2aa151a7182c58f9477a376304c538d9cc5ab (patch) | |
tree | 43f5be9eee8ec2bc305bad1fa9c275ef3d6f6bdb /drivers/isdn/i4l | |
parent | 9c3c0c2048149d946d7f3ebdcbe70e2946750bfb (diff) | |
download | linux-99c2aa151a7182c58f9477a376304c538d9cc5ab.tar.bz2 |
isdn: hdlc: move into mISDN
The last remnant of the isdn4linux interface is now the isdnhdlc
support, used by the netjet driver. Move it next to that driver.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Diffstat (limited to 'drivers/isdn/i4l')
-rw-r--r-- | drivers/isdn/i4l/Makefile | 6 | ||||
-rw-r--r-- | drivers/isdn/i4l/isdnhdlc.c | 630 |
2 files changed, 0 insertions, 636 deletions
diff --git a/drivers/isdn/i4l/Makefile b/drivers/isdn/i4l/Makefile deleted file mode 100644 index 11fe697739d5..000000000000 --- a/drivers/isdn/i4l/Makefile +++ /dev/null @@ -1,6 +0,0 @@ -# SPDX-License-Identifier: GPL-2.0 -# Makefile for the kernel ISDN subsystem and device drivers. - -# Each configuration option enables a list of files. - -obj-$(CONFIG_ISDN_HDLC) += isdnhdlc.o diff --git a/drivers/isdn/i4l/isdnhdlc.c b/drivers/isdn/i4l/isdnhdlc.c deleted file mode 100644 index 027d1c590679..000000000000 --- a/drivers/isdn/i4l/isdnhdlc.c +++ /dev/null @@ -1,630 +0,0 @@ -/* - * 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> - * - * 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. - */ - -#include <linux/module.h> -#include <linux/init.h> -#include <linux/crc-ccitt.h> -#include <linux/isdn/hdlc.h> -#include <linux/bitrev.h> - -/*-------------------------------------------------------------------*/ - -MODULE_AUTHOR("Wolfgang Mües <wolfgang@iksw-muees.de>, " - "Frode Isaksen <fisaksen@bewan.com>, " - "Kai Germaschewski <kai.germaschewski@gmx.de>"); -MODULE_DESCRIPTION("General purpose ISDN HDLC decoder"); -MODULE_LICENSE("GPL"); - -/*-------------------------------------------------------------------*/ - -enum { - HDLC_FAST_IDLE, HDLC_GET_FLAG_B0, HDLC_GETFLAG_B1A6, HDLC_GETFLAG_B7, - HDLC_GET_DATA, HDLC_FAST_FLAG -}; - -enum { - HDLC_SEND_DATA, HDLC_SEND_CRC1, HDLC_SEND_FAST_FLAG, - HDLC_SEND_FIRST_FLAG, HDLC_SEND_CRC2, HDLC_SEND_CLOSING_FLAG, - HDLC_SEND_IDLE1, HDLC_SEND_FAST_IDLE, HDLC_SENDFLAG_B0, - HDLC_SENDFLAG_B1A6, HDLC_SENDFLAG_B7, STOPPED, HDLC_SENDFLAG_ONE -}; - -void isdnhdlc_rcv_init(struct isdnhdlc_vars *hdlc, u32 features) -{ - memset(hdlc, 0, sizeof(struct isdnhdlc_vars)); - hdlc->state = HDLC_GET_DATA; - 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, u32 features) -{ - memset(hdlc, 0, sizeof(struct isdnhdlc_vars)); - if (features & HDLC_DCHANNEL) { - hdlc->dchannel = 1; - hdlc->state = HDLC_SEND_FIRST_FLAG; - } else { - hdlc->dchannel = 0; - hdlc->state = HDLC_SEND_FAST_FLAG; - hdlc->ffvalue = 0x7e; - } - hdlc->cbin = 0x7e; - if (features & HDLC_56KBIT) { - hdlc->do_adapt56 = 1; - hdlc->state = HDLC_SENDFLAG_B0; - } else - hdlc->data_bits = 8; - if (features & HDLC_BITREVERSE) - hdlc->do_bitreverse = 1; -} -EXPORT_SYMBOL(isdnhdlc_rcv_init); - -static int -check_frame(struct isdnhdlc_vars *hdlc) -{ - int status; - - if (hdlc->dstpos < 2) /* too small - framing error */ - status = -HDLC_FRAMING_ERROR; - else if (hdlc->crc != 0xf0b8) /* crc error */ - status = -HDLC_CRC_ERROR; - else { - /* remove CRC */ - hdlc->dstpos -= 2; - /* good frame */ - status = hdlc->dstpos; - } - return status; -} - -/* - isdnhdlc_decode - decodes HDLC frames from a transparent bit stream. - - The source buffer is scanned for valid HDLC frames looking for - flags (01111110) to indicate the start of a frame. If the start of - the frame is found, the bit stuffing is removed (0 after 5 1's). - When a new flag is found, the complete frame has been received - and the CRC is checked. - If a valid frame is found, the function returns the frame length - excluding the CRC with the bit HDLC_END_OF_FRAME set. - If the beginning of a valid frame is found, the function returns - the length. - If a framing error is found (too many 1s and not a flag) the function - returns the length with the bit HDLC_FRAMING_ERROR set. - If a CRC error is found the function returns the length with the - bit HDLC_CRC_ERROR set. - If the frame length exceeds the destination buffer size, the function - returns the length with the bit HDLC_LENGTH_ERROR set. - - src - source buffer - slen - source buffer length - count - number of bytes removed (decoded) from the source buffer - dst _ destination buffer - dsize - destination buffer size - returns - number of decoded bytes in the destination buffer and status - flag. -*/ -int isdnhdlc_decode(struct isdnhdlc_vars *hdlc, const u8 *src, int slen, - int *count, u8 *dst, int dsize) -{ - int status = 0; - - static const unsigned char fast_flag[] = { - 0x00, 0x00, 0x00, 0x20, 0x30, 0x38, 0x3c, 0x3e, 0x3f - }; - - static const unsigned char fast_flag_value[] = { - 0x00, 0x7e, 0xfc, 0xf9, 0xf3, 0xe7, 0xcf, 0x9f, 0x3f - }; - - static const unsigned char fast_abort[] = { - 0x00, 0x00, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff - }; - -#define handle_fast_flag(h) \ - do { \ - if (h->cbin == fast_flag[h->bit_shift]) { \ - h->ffvalue = fast_flag_value[h->bit_shift]; \ - h->state = HDLC_FAST_FLAG; \ - h->ffbit_shift = h->bit_shift; \ - h->bit_shift = 1; \ - } else { \ - h->state = HDLC_GET_DATA; \ - h->data_received = 0; \ - } \ - } while (0) - -#define handle_abort(h) \ - do { \ - h->shift_reg = fast_abort[h->ffbit_shift - 1]; \ - h->hdlc_bits1 = h->ffbit_shift - 2; \ - if (h->hdlc_bits1 < 0) \ - h->hdlc_bits1 = 0; \ - h->data_bits = h->ffbit_shift - 1; \ - h->state = HDLC_GET_DATA; \ - h->data_received = 0; \ - } while (0) - - *count = slen; - - while (slen > 0) { - if (hdlc->bit_shift == 0) { - /* 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) - hdlc->bit_shift--; - } - - switch (hdlc->state) { - case STOPPED: - return 0; - case HDLC_FAST_IDLE: - if (hdlc->cbin == 0xff) { - hdlc->bit_shift = 0; - break; - } - hdlc->state = HDLC_GET_FLAG_B0; - hdlc->hdlc_bits1 = 0; - hdlc->bit_shift = 8; - break; - case HDLC_GET_FLAG_B0: - if (!(hdlc->cbin & 0x80)) { - hdlc->state = HDLC_GETFLAG_B1A6; - hdlc->hdlc_bits1 = 0; - } else { - if ((!hdlc->do_adapt56) && - (++hdlc->hdlc_bits1 >= 8) && - (hdlc->bit_shift == 1)) - hdlc->state = HDLC_FAST_IDLE; - } - hdlc->cbin <<= 1; - hdlc->bit_shift--; - break; - case HDLC_GETFLAG_B1A6: - if (hdlc->cbin & 0x80) { - hdlc->hdlc_bits1++; - if (hdlc->hdlc_bits1 == 6) - hdlc->state = HDLC_GETFLAG_B7; - } else - hdlc->hdlc_bits1 = 0; - hdlc->cbin <<= 1; - hdlc->bit_shift--; - break; - case HDLC_GETFLAG_B7: - if (hdlc->cbin & 0x80) { - hdlc->state = HDLC_GET_FLAG_B0; - } else { - hdlc->state = HDLC_GET_DATA; - hdlc->crc = 0xffff; - hdlc->shift_reg = 0; - hdlc->hdlc_bits1 = 0; - hdlc->data_bits = 0; - hdlc->data_received = 0; - } - hdlc->cbin <<= 1; - hdlc->bit_shift--; - break; - case HDLC_GET_DATA: - if (hdlc->cbin & 0x80) { - hdlc->hdlc_bits1++; - switch (hdlc->hdlc_bits1) { - case 6: - break; - case 7: - if (hdlc->data_received) - /* bad frame */ - status = -HDLC_FRAMING_ERROR; - if (!hdlc->do_adapt56) { - if (hdlc->cbin == fast_abort - [hdlc->bit_shift + 1]) { - hdlc->state = - HDLC_FAST_IDLE; - hdlc->bit_shift = 1; - break; - } - } else - hdlc->state = HDLC_GET_FLAG_B0; - break; - default: - hdlc->shift_reg >>= 1; - hdlc->shift_reg |= 0x80; - hdlc->data_bits++; - break; - } - } else { - switch (hdlc->hdlc_bits1) { - case 5: - break; - case 6: - if (hdlc->data_received) - status = check_frame(hdlc); - hdlc->crc = 0xffff; - hdlc->shift_reg = 0; - hdlc->data_bits = 0; - if (!hdlc->do_adapt56) - handle_fast_flag(hdlc); - else { - hdlc->state = HDLC_GET_DATA; - hdlc->data_received = 0; - } - break; - default: - hdlc->shift_reg >>= 1; - hdlc->data_bits++; - break; - } - hdlc->hdlc_bits1 = 0; - } - if (status) { - hdlc->dstpos = 0; - *count -= slen; - hdlc->cbin <<= 1; - hdlc->bit_shift--; - return status; - } - if (hdlc->data_bits == 8) { - hdlc->data_bits = 0; - hdlc->data_received = 1; - hdlc->crc = crc_ccitt_byte(hdlc->crc, - hdlc->shift_reg); - - /* good byte received */ - if (hdlc->dstpos < dsize) - dst[hdlc->dstpos++] = hdlc->shift_reg; - else { - /* frame too long */ - status = -HDLC_LENGTH_ERROR; - hdlc->dstpos = 0; - } - } - hdlc->cbin <<= 1; - hdlc->bit_shift--; - break; - case HDLC_FAST_FLAG: - if (hdlc->cbin == hdlc->ffvalue) { - hdlc->bit_shift = 0; - break; - } else { - if (hdlc->cbin == 0xff) { - hdlc->state = HDLC_FAST_IDLE; - hdlc->bit_shift = 0; - } else if (hdlc->ffbit_shift == 8) { - hdlc->state = HDLC_GETFLAG_B7; - break; - } else - handle_abort(hdlc); - } - break; - default: - break; - } - } - *count -= slen; - return 0; -} -EXPORT_SYMBOL(isdnhdlc_decode); -/* - isdnhdlc_encode - encodes HDLC frames to a transparent bit stream. - - The bit stream starts with a beginning flag (01111110). After - that each byte is added to the bit stream with bit stuffing added - (0 after 5 1's). - When the last byte has been removed from the source buffer, the - CRC (2 bytes is added) and the frame terminates with the ending flag. - For the dchannel, the idle character (all 1's) is also added at the end. - If this function is called with empty source buffer (slen=0), flags or - idle character will be generated. - - src - source buffer - slen - source buffer length - count - number of bytes removed (encoded) from source buffer - dst _ destination buffer - dsize - destination buffer size - returns - number of encoded bytes in the destination buffer -*/ -int isdnhdlc_encode(struct isdnhdlc_vars *hdlc, const u8 *src, u16 slen, - int *count, u8 *dst, int dsize) -{ - static const unsigned char xfast_flag_value[] = { - 0x7e, 0x3f, 0x9f, 0xcf, 0xe7, 0xf3, 0xf9, 0xfc, 0x7e - }; - - int len = 0; - - *count = slen; - - /* special handling for one byte frames */ - if ((slen == 1) && (hdlc->state == HDLC_SEND_FAST_FLAG)) - hdlc->state = HDLC_SENDFLAG_ONE; - while (dsize > 0) { - if (hdlc->bit_shift == 0) { - if (slen && !hdlc->do_closing) { - hdlc->shift_reg = *src++; - slen--; - if (slen == 0) - /* closing sequence, CRC + flag(s) */ - hdlc->do_closing = 1; - hdlc->bit_shift = 8; - } else { - if (hdlc->state == HDLC_SEND_DATA) { - if (hdlc->data_received) { - hdlc->state = HDLC_SEND_CRC1; - hdlc->crc ^= 0xffff; - hdlc->bit_shift = 8; - hdlc->shift_reg = - hdlc->crc & 0xff; - } else if (!hdlc->do_adapt56) - hdlc->state = - HDLC_SEND_FAST_FLAG; - else - hdlc->state = - HDLC_SENDFLAG_B0; - } - - } - } - - switch (hdlc->state) { - case STOPPED: - while (dsize--) - *dst++ = 0xff; - return dsize; - case HDLC_SEND_FAST_FLAG: - hdlc->do_closing = 0; - if (slen == 0) { - /* the code is for bitreverse streams */ - if (hdlc->do_bitreverse == 0) - *dst++ = bitrev8(hdlc->ffvalue); - else - *dst++ = hdlc->ffvalue; - len++; - dsize--; - break; - } - /* fall through */ - case HDLC_SENDFLAG_ONE: - if (hdlc->bit_shift == 8) { - hdlc->cbin = hdlc->ffvalue >> - (8 - hdlc->data_bits); - hdlc->state = HDLC_SEND_DATA; - hdlc->crc = 0xffff; - hdlc->hdlc_bits1 = 0; - hdlc->data_received = 1; - } - break; - case HDLC_SENDFLAG_B0: - hdlc->do_closing = 0; - hdlc->cbin <<= 1; - hdlc->data_bits++; - hdlc->hdlc_bits1 = 0; - hdlc->state = HDLC_SENDFLAG_B1A6; - break; - case HDLC_SENDFLAG_B1A6: - hdlc->cbin <<= 1; - hdlc->data_bits++; - hdlc->cbin++; - if (++hdlc->hdlc_bits1 == 6) - hdlc->state = HDLC_SENDFLAG_B7; - break; - case HDLC_SENDFLAG_B7: - hdlc->cbin <<= 1; - hdlc->data_bits++; - if (slen == 0) { - hdlc->state = HDLC_SENDFLAG_B0; - break; - } - if (hdlc->bit_shift == 8) { - hdlc->state = HDLC_SEND_DATA; - hdlc->crc = 0xffff; - hdlc->hdlc_bits1 = 0; - hdlc->data_received = 1; - } - break; - case HDLC_SEND_FIRST_FLAG: - hdlc->data_received = 1; - if (hdlc->data_bits == 8) { - hdlc->state = HDLC_SEND_DATA; - hdlc->crc = 0xffff; - hdlc->hdlc_bits1 = 0; - break; - } - hdlc->cbin <<= 1; - hdlc->data_bits++; - if (hdlc->shift_reg & 0x01) - hdlc->cbin++; - hdlc->shift_reg >>= 1; - hdlc->bit_shift--; - if (hdlc->bit_shift == 0) { - hdlc->state = HDLC_SEND_DATA; - hdlc->crc = 0xffff; - hdlc->hdlc_bits1 = 0; - } - break; - case HDLC_SEND_DATA: - hdlc->cbin <<= 1; - hdlc->data_bits++; - if (hdlc->hdlc_bits1 == 5) { - hdlc->hdlc_bits1 = 0; - break; - } - if (hdlc->bit_shift == 8) - hdlc->crc = crc_ccitt_byte(hdlc->crc, - hdlc->shift_reg); - if (hdlc->shift_reg & 0x01) { - hdlc->hdlc_bits1++; - hdlc->cbin++; - hdlc->shift_reg >>= 1; - hdlc->bit_shift--; - } else { - hdlc->hdlc_bits1 = 0; - hdlc->shift_reg >>= 1; - hdlc->bit_shift--; - } - break; - case HDLC_SEND_CRC1: - hdlc->cbin <<= 1; - hdlc->data_bits++; - if (hdlc->hdlc_bits1 == 5) { - hdlc->hdlc_bits1 = 0; - break; - } - if (hdlc->shift_reg & 0x01) { - hdlc->hdlc_bits1++; - hdlc->cbin++; - hdlc->shift_reg >>= 1; - hdlc->bit_shift--; - } else { - hdlc->hdlc_bits1 = 0; - hdlc->shift_reg >>= 1; - hdlc->bit_shift--; - } - if (hdlc->bit_shift == 0) { - hdlc->shift_reg = (hdlc->crc >> 8); - hdlc->state = HDLC_SEND_CRC2; - hdlc->bit_shift = 8; - } - break; - case HDLC_SEND_CRC2: - hdlc->cbin <<= 1; - hdlc->data_bits++; - if (hdlc->hdlc_bits1 == 5) { - hdlc->hdlc_bits1 = 0; - break; - } - if (hdlc->shift_reg & 0x01) { - hdlc->hdlc_bits1++; - hdlc->cbin++; - hdlc->shift_reg >>= 1; - hdlc->bit_shift--; - } else { - hdlc->hdlc_bits1 = 0; - hdlc->shift_reg >>= 1; - hdlc->bit_shift--; - } - if (hdlc->bit_shift == 0) { - hdlc->shift_reg = 0x7e; - hdlc->state = HDLC_SEND_CLOSING_FLAG; - hdlc->bit_shift = 8; - } - break; - case HDLC_SEND_CLOSING_FLAG: - hdlc->cbin <<= 1; - hdlc->data_bits++; - if (hdlc->hdlc_bits1 == 5) { - hdlc->hdlc_bits1 = 0; - break; - } - if (hdlc->shift_reg & 0x01) - hdlc->cbin++; - hdlc->shift_reg >>= 1; - hdlc->bit_shift--; - if (hdlc->bit_shift == 0) { - hdlc->ffvalue = - xfast_flag_value[hdlc->data_bits]; - if (hdlc->dchannel) { - hdlc->ffvalue = 0x7e; - hdlc->state = HDLC_SEND_IDLE1; - hdlc->bit_shift = 8-hdlc->data_bits; - if (hdlc->bit_shift == 0) - hdlc->state = - HDLC_SEND_FAST_IDLE; - } else { - if (!hdlc->do_adapt56) { - hdlc->state = - HDLC_SEND_FAST_FLAG; - hdlc->data_received = 0; - } else { - hdlc->state = HDLC_SENDFLAG_B0; - hdlc->data_received = 0; - } - /* Finished this frame, send flags */ - if (dsize > 1) - dsize = 1; - } - } - break; - case HDLC_SEND_IDLE1: - hdlc->do_closing = 0; - hdlc->cbin <<= 1; - hdlc->cbin++; - hdlc->data_bits++; - hdlc->bit_shift--; - if (hdlc->bit_shift == 0) { - hdlc->state = HDLC_SEND_FAST_IDLE; - hdlc->bit_shift = 0; - } - break; - case HDLC_SEND_FAST_IDLE: - hdlc->do_closing = 0; - hdlc->cbin = 0xff; - hdlc->data_bits = 8; - if (hdlc->bit_shift == 8) { - hdlc->cbin = 0x7e; - hdlc->state = HDLC_SEND_FIRST_FLAG; - } else { - /* 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++; - dsize = 0; - } - break; - default: - break; - } - if (hdlc->do_adapt56) { - if (hdlc->data_bits == 7) { - hdlc->cbin <<= 1; - hdlc->cbin++; - hdlc->data_bits++; - } - } - if (hdlc->data_bits == 8) { - /* 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--; - } - } - *count -= slen; - - return len; -} -EXPORT_SYMBOL(isdnhdlc_encode); |