Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Common data handling layer for ser_gigaset and usb_gigaset |
| 3 | * |
| 4 | * Copyright (c) 2005 by Tilman Schmidt <tilman@imap.cc>, |
| 5 | * Hansjoerg Lipp <hjlipp@web.de>, |
Tilman Schmidt | 70440cf | 2006-04-10 22:55:14 -0700 | [diff] [blame] | 6 | * Stefan Eilers. |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 7 | * |
| 8 | * ===================================================================== |
| 9 | * This program is free software; you can redistribute it and/or |
| 10 | * modify it under the terms of the GNU General Public License as |
| 11 | * published by the Free Software Foundation; either version 2 of |
| 12 | * the License, or (at your option) any later version. |
| 13 | * ===================================================================== |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 14 | */ |
| 15 | |
Tilman Schmidt | 2869b23 | 2007-02-12 00:52:34 -0800 | [diff] [blame] | 16 | /* not set by Kbuild when building both ser_gigaset and usb_gigaset */ |
| 17 | #ifndef KBUILD_MODNAME |
| 18 | #define KBUILD_MODNAME "asy_gigaset" |
| 19 | #endif |
| 20 | |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 21 | #include "gigaset.h" |
| 22 | #include <linux/crc-ccitt.h> |
Akinobu Mita | 17b3cff | 2006-12-08 02:36:30 -0800 | [diff] [blame] | 23 | #include <linux/bitrev.h> |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 24 | |
| 25 | //#define GIG_M10x_STUFF_VOICE_DATA |
| 26 | |
| 27 | /* check if byte must be stuffed/escaped |
| 28 | * I'm not sure which data should be encoded. |
| 29 | * Therefore I will go the hard way and decode every value |
| 30 | * less than 0x20, the flag sequence and the control escape char. |
| 31 | */ |
| 32 | static inline int muststuff(unsigned char c) |
| 33 | { |
| 34 | if (c < PPP_TRANS) return 1; |
| 35 | if (c == PPP_FLAG) return 1; |
| 36 | if (c == PPP_ESCAPE) return 1; |
| 37 | /* other possible candidates: */ |
| 38 | /* 0x91: XON with parity set */ |
| 39 | /* 0x93: XOFF with parity set */ |
| 40 | return 0; |
| 41 | } |
| 42 | |
| 43 | /* == data input =========================================================== */ |
| 44 | |
| 45 | /* process a block of received bytes in command mode (modem response) |
| 46 | * Return value: |
| 47 | * number of processed bytes |
| 48 | */ |
| 49 | static inline int cmd_loop(unsigned char c, unsigned char *src, int numbytes, |
Tilman Schmidt | 784d585 | 2006-04-10 22:55:04 -0700 | [diff] [blame] | 50 | struct inbuf_t *inbuf) |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 51 | { |
| 52 | struct cardstate *cs = inbuf->cs; |
| 53 | unsigned cbytes = cs->cbytes; |
| 54 | int inputstate = inbuf->inputstate; |
| 55 | int startbytes = numbytes; |
| 56 | |
| 57 | for (;;) { |
| 58 | cs->respdata[cbytes] = c; |
| 59 | if (c == 10 || c == 13) { |
Tilman Schmidt | 784d585 | 2006-04-10 22:55:04 -0700 | [diff] [blame] | 60 | gig_dbg(DEBUG_TRANSCMD, "%s: End of Command (%d Bytes)", |
| 61 | __func__, cbytes); |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 62 | cs->cbytes = cbytes; |
Tilman Schmidt | 917f508 | 2006-04-10 22:55:00 -0700 | [diff] [blame] | 63 | gigaset_handle_modem_response(cs); /* can change |
| 64 | cs->dle */ |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 65 | cbytes = 0; |
| 66 | |
| 67 | if (cs->dle && |
| 68 | !(inputstate & INS_DLE_command)) { |
| 69 | inputstate &= ~INS_command; |
| 70 | break; |
| 71 | } |
| 72 | } else { |
| 73 | /* advance in line buffer, checking for overflow */ |
| 74 | if (cbytes < MAX_RESP_SIZE - 1) |
| 75 | cbytes++; |
| 76 | else |
Tilman Schmidt | 784d585 | 2006-04-10 22:55:04 -0700 | [diff] [blame] | 77 | dev_warn(cs->dev, "response too large\n"); |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 78 | } |
| 79 | |
| 80 | if (!numbytes) |
| 81 | break; |
| 82 | c = *src++; |
| 83 | --numbytes; |
| 84 | if (c == DLE_FLAG && |
| 85 | (cs->dle || inputstate & INS_DLE_command)) { |
| 86 | inputstate |= INS_DLE_char; |
| 87 | break; |
| 88 | } |
| 89 | } |
| 90 | |
| 91 | cs->cbytes = cbytes; |
| 92 | inbuf->inputstate = inputstate; |
| 93 | |
| 94 | return startbytes - numbytes; |
| 95 | } |
| 96 | |
| 97 | /* process a block of received bytes in lock mode (tty i/f) |
| 98 | * Return value: |
| 99 | * number of processed bytes |
| 100 | */ |
| 101 | static inline int lock_loop(unsigned char *src, int numbytes, |
Tilman Schmidt | 784d585 | 2006-04-10 22:55:04 -0700 | [diff] [blame] | 102 | struct inbuf_t *inbuf) |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 103 | { |
| 104 | struct cardstate *cs = inbuf->cs; |
| 105 | |
Tilman Schmidt | 917f508 | 2006-04-10 22:55:00 -0700 | [diff] [blame] | 106 | gigaset_dbg_buffer(DEBUG_LOCKCMD, "received response", |
Tilman Schmidt | 0137150 | 2006-04-10 22:55:11 -0700 | [diff] [blame] | 107 | numbytes, src); |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 108 | gigaset_if_receive(cs, src, numbytes); |
| 109 | |
| 110 | return numbytes; |
| 111 | } |
| 112 | |
| 113 | /* process a block of received bytes in HDLC data mode |
| 114 | * Collect HDLC frames, undoing byte stuffing and watching for DLE escapes. |
| 115 | * When a frame is complete, check the FCS and pass valid frames to the LL. |
| 116 | * If DLE is encountered, return immediately to let the caller handle it. |
| 117 | * Return value: |
| 118 | * number of processed bytes |
| 119 | * numbytes (all bytes processed) on error --FIXME |
| 120 | */ |
| 121 | static inline int hdlc_loop(unsigned char c, unsigned char *src, int numbytes, |
Tilman Schmidt | 784d585 | 2006-04-10 22:55:04 -0700 | [diff] [blame] | 122 | struct inbuf_t *inbuf) |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 123 | { |
| 124 | struct cardstate *cs = inbuf->cs; |
| 125 | struct bc_state *bcs = inbuf->bcs; |
Tilman Schmidt | d48c778 | 2006-04-10 22:55:08 -0700 | [diff] [blame] | 126 | int inputstate = bcs->inputstate; |
| 127 | __u16 fcs = bcs->fcs; |
| 128 | struct sk_buff *skb = bcs->skb; |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 129 | unsigned char error; |
| 130 | struct sk_buff *compskb; |
| 131 | int startbytes = numbytes; |
| 132 | int l; |
| 133 | |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 134 | if (unlikely(inputstate & INS_byte_stuff)) { |
| 135 | inputstate &= ~INS_byte_stuff; |
| 136 | goto byte_stuff; |
| 137 | } |
| 138 | for (;;) { |
| 139 | if (unlikely(c == PPP_ESCAPE)) { |
| 140 | if (unlikely(!numbytes)) { |
| 141 | inputstate |= INS_byte_stuff; |
| 142 | break; |
| 143 | } |
| 144 | c = *src++; |
| 145 | --numbytes; |
| 146 | if (unlikely(c == DLE_FLAG && |
| 147 | (cs->dle || |
| 148 | inbuf->inputstate & INS_DLE_command))) { |
| 149 | inbuf->inputstate |= INS_DLE_char; |
| 150 | inputstate |= INS_byte_stuff; |
| 151 | break; |
| 152 | } |
| 153 | byte_stuff: |
| 154 | c ^= PPP_TRANS; |
| 155 | #ifdef CONFIG_GIGASET_DEBUG |
| 156 | if (unlikely(!muststuff(c))) |
Tilman Schmidt | 784d585 | 2006-04-10 22:55:04 -0700 | [diff] [blame] | 157 | gig_dbg(DEBUG_HDLC, "byte stuffed: 0x%02x", c); |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 158 | #endif |
| 159 | } else if (unlikely(c == PPP_FLAG)) { |
| 160 | if (unlikely(inputstate & INS_skip_frame)) { |
| 161 | if (!(inputstate & INS_have_data)) { /* 7E 7E */ |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 162 | #ifdef CONFIG_GIGASET_DEBUG |
| 163 | ++bcs->emptycount; |
| 164 | #endif |
| 165 | } else |
Tilman Schmidt | 784d585 | 2006-04-10 22:55:04 -0700 | [diff] [blame] | 166 | gig_dbg(DEBUG_HDLC, |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 167 | "7e----------------------------"); |
| 168 | |
| 169 | /* end of frame */ |
| 170 | error = 1; |
| 171 | gigaset_rcv_error(NULL, cs, bcs); |
| 172 | } else if (!(inputstate & INS_have_data)) { /* 7E 7E */ |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 173 | #ifdef CONFIG_GIGASET_DEBUG |
| 174 | ++bcs->emptycount; |
| 175 | #endif |
| 176 | break; |
| 177 | } else { |
Tilman Schmidt | 784d585 | 2006-04-10 22:55:04 -0700 | [diff] [blame] | 178 | gig_dbg(DEBUG_HDLC, |
| 179 | "7e----------------------------"); |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 180 | |
| 181 | /* end of frame */ |
| 182 | error = 0; |
| 183 | |
| 184 | if (unlikely(fcs != PPP_GOODFCS)) { |
Tilman Schmidt | 784d585 | 2006-04-10 22:55:04 -0700 | [diff] [blame] | 185 | dev_err(cs->dev, |
| 186 | "Packet checksum at %lu failed, " |
| 187 | "packet is corrupted (%u bytes)!\n", |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 188 | bcs->rcvbytes, skb->len); |
| 189 | compskb = NULL; |
| 190 | gigaset_rcv_error(compskb, cs, bcs); |
| 191 | error = 1; |
| 192 | } else { |
| 193 | if (likely((l = skb->len) > 2)) { |
| 194 | skb->tail -= 2; |
| 195 | skb->len -= 2; |
| 196 | } else { |
| 197 | dev_kfree_skb(skb); |
| 198 | skb = NULL; |
| 199 | inputstate |= INS_skip_frame; |
| 200 | if (l == 1) { |
Tilman Schmidt | 784d585 | 2006-04-10 22:55:04 -0700 | [diff] [blame] | 201 | dev_err(cs->dev, |
| 202 | "invalid packet size (1)!\n"); |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 203 | error = 1; |
Tilman Schmidt | 784d585 | 2006-04-10 22:55:04 -0700 | [diff] [blame] | 204 | gigaset_rcv_error(NULL, |
| 205 | cs, bcs); |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 206 | } |
| 207 | } |
| 208 | if (likely(!(error || |
| 209 | (inputstate & |
| 210 | INS_skip_frame)))) { |
| 211 | gigaset_rcv_skb(skb, cs, bcs); |
| 212 | } |
| 213 | } |
| 214 | } |
| 215 | |
| 216 | if (unlikely(error)) |
| 217 | if (skb) |
| 218 | dev_kfree_skb(skb); |
| 219 | |
| 220 | fcs = PPP_INITFCS; |
| 221 | inputstate &= ~(INS_have_data | INS_skip_frame); |
| 222 | if (unlikely(bcs->ignore)) { |
| 223 | inputstate |= INS_skip_frame; |
| 224 | skb = NULL; |
| 225 | } else if (likely((skb = dev_alloc_skb(SBUFSIZE + HW_HDR_LEN)) != NULL)) { |
| 226 | skb_reserve(skb, HW_HDR_LEN); |
| 227 | } else { |
Tilman Schmidt | 784d585 | 2006-04-10 22:55:04 -0700 | [diff] [blame] | 228 | dev_warn(cs->dev, |
| 229 | "could not allocate new skb\n"); |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 230 | inputstate |= INS_skip_frame; |
| 231 | } |
| 232 | |
| 233 | break; |
| 234 | #ifdef CONFIG_GIGASET_DEBUG |
| 235 | } else if (unlikely(muststuff(c))) { |
| 236 | /* Should not happen. Possible after ZDLE=1<CR><LF>. */ |
Tilman Schmidt | 784d585 | 2006-04-10 22:55:04 -0700 | [diff] [blame] | 237 | gig_dbg(DEBUG_HDLC, "not byte stuffed: 0x%02x", c); |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 238 | #endif |
| 239 | } |
| 240 | |
| 241 | /* add character */ |
| 242 | |
| 243 | #ifdef CONFIG_GIGASET_DEBUG |
| 244 | if (unlikely(!(inputstate & INS_have_data))) { |
Tilman Schmidt | 784d585 | 2006-04-10 22:55:04 -0700 | [diff] [blame] | 245 | gig_dbg(DEBUG_HDLC, "7e (%d x) ================", |
| 246 | bcs->emptycount); |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 247 | bcs->emptycount = 0; |
| 248 | } |
| 249 | #endif |
| 250 | |
| 251 | inputstate |= INS_have_data; |
| 252 | |
| 253 | if (likely(!(inputstate & INS_skip_frame))) { |
| 254 | if (unlikely(skb->len == SBUFSIZE)) { |
Tilman Schmidt | 784d585 | 2006-04-10 22:55:04 -0700 | [diff] [blame] | 255 | dev_warn(cs->dev, "received packet too long\n"); |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 256 | dev_kfree_skb_any(skb); |
| 257 | skb = NULL; |
| 258 | inputstate |= INS_skip_frame; |
| 259 | break; |
| 260 | } |
Tilman Schmidt | 443e1f4 | 2006-04-10 22:55:13 -0700 | [diff] [blame] | 261 | *__skb_put(skb, 1) = c; |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 262 | fcs = crc_ccitt_byte(fcs, c); |
| 263 | } |
| 264 | |
| 265 | if (unlikely(!numbytes)) |
| 266 | break; |
| 267 | c = *src++; |
| 268 | --numbytes; |
| 269 | if (unlikely(c == DLE_FLAG && |
| 270 | (cs->dle || |
| 271 | inbuf->inputstate & INS_DLE_command))) { |
| 272 | inbuf->inputstate |= INS_DLE_char; |
| 273 | break; |
| 274 | } |
| 275 | } |
| 276 | bcs->inputstate = inputstate; |
| 277 | bcs->fcs = fcs; |
| 278 | bcs->skb = skb; |
| 279 | return startbytes - numbytes; |
| 280 | } |
| 281 | |
| 282 | /* process a block of received bytes in transparent data mode |
| 283 | * Invert bytes, undoing byte stuffing and watching for DLE escapes. |
| 284 | * If DLE is encountered, return immediately to let the caller handle it. |
| 285 | * Return value: |
| 286 | * number of processed bytes |
| 287 | * numbytes (all bytes processed) on error --FIXME |
| 288 | */ |
| 289 | static inline int iraw_loop(unsigned char c, unsigned char *src, int numbytes, |
Tilman Schmidt | 784d585 | 2006-04-10 22:55:04 -0700 | [diff] [blame] | 290 | struct inbuf_t *inbuf) |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 291 | { |
| 292 | struct cardstate *cs = inbuf->cs; |
| 293 | struct bc_state *bcs = inbuf->bcs; |
Tilman Schmidt | d48c778 | 2006-04-10 22:55:08 -0700 | [diff] [blame] | 294 | int inputstate = bcs->inputstate; |
| 295 | struct sk_buff *skb = bcs->skb; |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 296 | int startbytes = numbytes; |
| 297 | |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 298 | for (;;) { |
| 299 | /* add character */ |
| 300 | inputstate |= INS_have_data; |
| 301 | |
| 302 | if (likely(!(inputstate & INS_skip_frame))) { |
| 303 | if (unlikely(skb->len == SBUFSIZE)) { |
| 304 | //FIXME just pass skb up and allocate a new one |
Tilman Schmidt | 784d585 | 2006-04-10 22:55:04 -0700 | [diff] [blame] | 305 | dev_warn(cs->dev, "received packet too long\n"); |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 306 | dev_kfree_skb_any(skb); |
| 307 | skb = NULL; |
| 308 | inputstate |= INS_skip_frame; |
| 309 | break; |
| 310 | } |
Akinobu Mita | 17b3cff | 2006-12-08 02:36:30 -0800 | [diff] [blame] | 311 | *__skb_put(skb, 1) = bitrev8(c); |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 312 | } |
| 313 | |
| 314 | if (unlikely(!numbytes)) |
| 315 | break; |
| 316 | c = *src++; |
| 317 | --numbytes; |
| 318 | if (unlikely(c == DLE_FLAG && |
| 319 | (cs->dle || |
| 320 | inbuf->inputstate & INS_DLE_command))) { |
| 321 | inbuf->inputstate |= INS_DLE_char; |
| 322 | break; |
| 323 | } |
| 324 | } |
| 325 | |
| 326 | /* pass data up */ |
| 327 | if (likely(inputstate & INS_have_data)) { |
| 328 | if (likely(!(inputstate & INS_skip_frame))) { |
| 329 | gigaset_rcv_skb(skb, cs, bcs); |
| 330 | } |
| 331 | inputstate &= ~(INS_have_data | INS_skip_frame); |
| 332 | if (unlikely(bcs->ignore)) { |
| 333 | inputstate |= INS_skip_frame; |
| 334 | skb = NULL; |
| 335 | } else if (likely((skb = dev_alloc_skb(SBUFSIZE + HW_HDR_LEN)) |
| 336 | != NULL)) { |
| 337 | skb_reserve(skb, HW_HDR_LEN); |
| 338 | } else { |
Tilman Schmidt | 784d585 | 2006-04-10 22:55:04 -0700 | [diff] [blame] | 339 | dev_warn(cs->dev, "could not allocate new skb\n"); |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 340 | inputstate |= INS_skip_frame; |
| 341 | } |
| 342 | } |
| 343 | |
| 344 | bcs->inputstate = inputstate; |
| 345 | bcs->skb = skb; |
| 346 | return startbytes - numbytes; |
| 347 | } |
| 348 | |
| 349 | /* process a block of data received from the device |
| 350 | */ |
| 351 | void gigaset_m10x_input(struct inbuf_t *inbuf) |
| 352 | { |
| 353 | struct cardstate *cs; |
| 354 | unsigned tail, head, numbytes; |
| 355 | unsigned char *src, c; |
| 356 | int procbytes; |
| 357 | |
| 358 | head = atomic_read(&inbuf->head); |
| 359 | tail = atomic_read(&inbuf->tail); |
Tilman Schmidt | 784d585 | 2006-04-10 22:55:04 -0700 | [diff] [blame] | 360 | gig_dbg(DEBUG_INTR, "buffer state: %u -> %u", head, tail); |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 361 | |
| 362 | if (head != tail) { |
| 363 | cs = inbuf->cs; |
| 364 | src = inbuf->data + head; |
| 365 | numbytes = (head > tail ? RBUFSIZE : tail) - head; |
Tilman Schmidt | 784d585 | 2006-04-10 22:55:04 -0700 | [diff] [blame] | 366 | gig_dbg(DEBUG_INTR, "processing %u bytes", numbytes); |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 367 | |
| 368 | while (numbytes) { |
| 369 | if (atomic_read(&cs->mstate) == MS_LOCKED) { |
| 370 | procbytes = lock_loop(src, numbytes, inbuf); |
| 371 | src += procbytes; |
| 372 | numbytes -= procbytes; |
| 373 | } else { |
| 374 | c = *src++; |
| 375 | --numbytes; |
| 376 | if (c == DLE_FLAG && (cs->dle || |
| 377 | inbuf->inputstate & INS_DLE_command)) { |
| 378 | if (!(inbuf->inputstate & INS_DLE_char)) { |
| 379 | inbuf->inputstate |= INS_DLE_char; |
| 380 | goto nextbyte; |
| 381 | } |
| 382 | /* <DLE> <DLE> => <DLE> in data stream */ |
| 383 | inbuf->inputstate &= ~INS_DLE_char; |
| 384 | } |
| 385 | |
| 386 | if (!(inbuf->inputstate & INS_DLE_char)) { |
| 387 | |
Tilman Schmidt | 917f508 | 2006-04-10 22:55:00 -0700 | [diff] [blame] | 388 | /* FIXME use function pointers? */ |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 389 | if (inbuf->inputstate & INS_command) |
| 390 | procbytes = cmd_loop(c, src, numbytes, inbuf); |
| 391 | else if (inbuf->bcs->proto2 == ISDN_PROTO_L2_HDLC) |
| 392 | procbytes = hdlc_loop(c, src, numbytes, inbuf); |
| 393 | else |
| 394 | procbytes = iraw_loop(c, src, numbytes, inbuf); |
| 395 | |
| 396 | src += procbytes; |
| 397 | numbytes -= procbytes; |
Tilman Schmidt | 784d585 | 2006-04-10 22:55:04 -0700 | [diff] [blame] | 398 | } else { /* DLE char */ |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 399 | inbuf->inputstate &= ~INS_DLE_char; |
| 400 | switch (c) { |
| 401 | case 'X': /*begin of command*/ |
| 402 | #ifdef CONFIG_GIGASET_DEBUG |
| 403 | if (inbuf->inputstate & INS_command) |
Tilman Schmidt | 784d585 | 2006-04-10 22:55:04 -0700 | [diff] [blame] | 404 | dev_err(cs->dev, |
| 405 | "received <DLE> 'X' in command mode\n"); |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 406 | #endif |
| 407 | inbuf->inputstate |= |
| 408 | INS_command | INS_DLE_command; |
| 409 | break; |
| 410 | case '.': /*end of command*/ |
| 411 | #ifdef CONFIG_GIGASET_DEBUG |
| 412 | if (!(inbuf->inputstate & INS_command)) |
Tilman Schmidt | 784d585 | 2006-04-10 22:55:04 -0700 | [diff] [blame] | 413 | dev_err(cs->dev, |
| 414 | "received <DLE> '.' in hdlc mode\n"); |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 415 | #endif |
| 416 | inbuf->inputstate &= cs->dle ? |
| 417 | ~(INS_DLE_command|INS_command) |
| 418 | : ~INS_DLE_command; |
| 419 | break; |
| 420 | //case DLE_FLAG: /*DLE_FLAG in data stream*/ /* schon oben behandelt! */ |
| 421 | default: |
Tilman Schmidt | 784d585 | 2006-04-10 22:55:04 -0700 | [diff] [blame] | 422 | dev_err(cs->dev, |
| 423 | "received 0x10 0x%02x!\n", |
| 424 | (int) c); |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 425 | /* FIXME: reset driver?? */ |
| 426 | } |
| 427 | } |
| 428 | } |
| 429 | nextbyte: |
| 430 | if (!numbytes) { |
| 431 | /* end of buffer, check for wrap */ |
| 432 | if (head > tail) { |
| 433 | head = 0; |
| 434 | src = inbuf->data; |
| 435 | numbytes = tail; |
| 436 | } else { |
| 437 | head = tail; |
| 438 | break; |
| 439 | } |
| 440 | } |
| 441 | } |
| 442 | |
Tilman Schmidt | 784d585 | 2006-04-10 22:55:04 -0700 | [diff] [blame] | 443 | gig_dbg(DEBUG_INTR, "setting head to %u", head); |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 444 | atomic_set(&inbuf->head, head); |
| 445 | } |
| 446 | } |
Adrian Bunk | d5c1682 | 2007-02-20 13:58:17 -0800 | [diff] [blame^] | 447 | EXPORT_SYMBOL_GPL(gigaset_m10x_input); |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 448 | |
| 449 | |
| 450 | /* == data output ========================================================== */ |
| 451 | |
| 452 | /* Encoding of a PPP packet into an octet stuffed HDLC frame |
| 453 | * with FCS, opening and closing flags. |
| 454 | * parameters: |
| 455 | * skb skb containing original packet (freed upon return) |
| 456 | * head number of headroom bytes to allocate in result skb |
| 457 | * tail number of tailroom bytes to allocate in result skb |
| 458 | * Return value: |
| 459 | * pointer to newly allocated skb containing the result frame |
| 460 | */ |
| 461 | static struct sk_buff *HDLC_Encode(struct sk_buff *skb, int head, int tail) |
| 462 | { |
| 463 | struct sk_buff *hdlc_skb; |
| 464 | __u16 fcs; |
| 465 | unsigned char c; |
| 466 | unsigned char *cp; |
| 467 | int len; |
| 468 | unsigned int stuf_cnt; |
| 469 | |
| 470 | stuf_cnt = 0; |
| 471 | fcs = PPP_INITFCS; |
| 472 | cp = skb->data; |
| 473 | len = skb->len; |
| 474 | while (len--) { |
| 475 | if (muststuff(*cp)) |
| 476 | stuf_cnt++; |
| 477 | fcs = crc_ccitt_byte(fcs, *cp++); |
| 478 | } |
Tilman Schmidt | 784d585 | 2006-04-10 22:55:04 -0700 | [diff] [blame] | 479 | fcs ^= 0xffff; /* complement */ |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 480 | |
| 481 | /* size of new buffer: original size + number of stuffing bytes |
| 482 | * + 2 bytes FCS + 2 stuffing bytes for FCS (if needed) + 2 flag bytes |
| 483 | */ |
| 484 | hdlc_skb = dev_alloc_skb(skb->len + stuf_cnt + 6 + tail + head); |
| 485 | if (!hdlc_skb) { |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 486 | dev_kfree_skb(skb); |
| 487 | return NULL; |
| 488 | } |
| 489 | skb_reserve(hdlc_skb, head); |
| 490 | |
| 491 | /* Copy acknowledge request into new skb */ |
| 492 | memcpy(hdlc_skb->head, skb->head, 2); |
| 493 | |
| 494 | /* Add flag sequence in front of everything.. */ |
| 495 | *(skb_put(hdlc_skb, 1)) = PPP_FLAG; |
| 496 | |
| 497 | /* Perform byte stuffing while copying data. */ |
| 498 | while (skb->len--) { |
| 499 | if (muststuff(*skb->data)) { |
| 500 | *(skb_put(hdlc_skb, 1)) = PPP_ESCAPE; |
| 501 | *(skb_put(hdlc_skb, 1)) = (*skb->data++) ^ PPP_TRANS; |
| 502 | } else |
| 503 | *(skb_put(hdlc_skb, 1)) = *skb->data++; |
| 504 | } |
| 505 | |
| 506 | /* Finally add FCS (byte stuffed) and flag sequence */ |
Tilman Schmidt | 784d585 | 2006-04-10 22:55:04 -0700 | [diff] [blame] | 507 | c = (fcs & 0x00ff); /* least significant byte first */ |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 508 | if (muststuff(c)) { |
| 509 | *(skb_put(hdlc_skb, 1)) = PPP_ESCAPE; |
| 510 | c ^= PPP_TRANS; |
| 511 | } |
| 512 | *(skb_put(hdlc_skb, 1)) = c; |
| 513 | |
| 514 | c = ((fcs >> 8) & 0x00ff); |
| 515 | if (muststuff(c)) { |
| 516 | *(skb_put(hdlc_skb, 1)) = PPP_ESCAPE; |
| 517 | c ^= PPP_TRANS; |
| 518 | } |
| 519 | *(skb_put(hdlc_skb, 1)) = c; |
| 520 | |
| 521 | *(skb_put(hdlc_skb, 1)) = PPP_FLAG; |
| 522 | |
| 523 | dev_kfree_skb(skb); |
| 524 | return hdlc_skb; |
| 525 | } |
| 526 | |
| 527 | /* Encoding of a raw packet into an octet stuffed bit inverted frame |
| 528 | * parameters: |
| 529 | * skb skb containing original packet (freed upon return) |
| 530 | * head number of headroom bytes to allocate in result skb |
| 531 | * tail number of tailroom bytes to allocate in result skb |
| 532 | * Return value: |
| 533 | * pointer to newly allocated skb containing the result frame |
| 534 | */ |
| 535 | static struct sk_buff *iraw_encode(struct sk_buff *skb, int head, int tail) |
| 536 | { |
| 537 | struct sk_buff *iraw_skb; |
| 538 | unsigned char c; |
| 539 | unsigned char *cp; |
| 540 | int len; |
| 541 | |
| 542 | /* worst case: every byte must be stuffed */ |
| 543 | iraw_skb = dev_alloc_skb(2*skb->len + tail + head); |
| 544 | if (!iraw_skb) { |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 545 | dev_kfree_skb(skb); |
| 546 | return NULL; |
| 547 | } |
| 548 | skb_reserve(iraw_skb, head); |
| 549 | |
| 550 | cp = skb->data; |
| 551 | len = skb->len; |
| 552 | while (len--) { |
Akinobu Mita | 17b3cff | 2006-12-08 02:36:30 -0800 | [diff] [blame] | 553 | c = bitrev8(*cp++); |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 554 | if (c == DLE_FLAG) |
| 555 | *(skb_put(iraw_skb, 1)) = c; |
| 556 | *(skb_put(iraw_skb, 1)) = c; |
| 557 | } |
| 558 | dev_kfree_skb(skb); |
| 559 | return iraw_skb; |
| 560 | } |
| 561 | |
| 562 | /* gigaset_send_skb |
| 563 | * called by common.c to queue an skb for sending |
| 564 | * and start transmission if necessary |
| 565 | * parameters: |
| 566 | * B Channel control structure |
| 567 | * skb |
| 568 | * Return value: |
| 569 | * number of bytes accepted for sending |
| 570 | * (skb->len if ok, 0 if out of buffer space) |
| 571 | * or error code (< 0, eg. -EINVAL) |
| 572 | */ |
| 573 | int gigaset_m10x_send_skb(struct bc_state *bcs, struct sk_buff *skb) |
| 574 | { |
Tilman Schmidt | d48c778 | 2006-04-10 22:55:08 -0700 | [diff] [blame] | 575 | unsigned len = skb->len; |
Tilman Schmidt | 69049cc | 2006-04-10 22:55:16 -0700 | [diff] [blame] | 576 | unsigned long flags; |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 577 | |
| 578 | if (bcs->proto2 == ISDN_PROTO_L2_HDLC) |
| 579 | skb = HDLC_Encode(skb, HW_HDR_LEN, 0); |
| 580 | else |
| 581 | skb = iraw_encode(skb, HW_HDR_LEN, 0); |
Tilman Schmidt | 784d585 | 2006-04-10 22:55:04 -0700 | [diff] [blame] | 582 | if (!skb) { |
Tilman Schmidt | 69049cc | 2006-04-10 22:55:16 -0700 | [diff] [blame] | 583 | err("unable to allocate memory for encoding!\n"); |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 584 | return -ENOMEM; |
Tilman Schmidt | 784d585 | 2006-04-10 22:55:04 -0700 | [diff] [blame] | 585 | } |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 586 | |
| 587 | skb_queue_tail(&bcs->squeue, skb); |
Tilman Schmidt | 69049cc | 2006-04-10 22:55:16 -0700 | [diff] [blame] | 588 | spin_lock_irqsave(&bcs->cs->lock, flags); |
| 589 | if (bcs->cs->connected) |
| 590 | tasklet_schedule(&bcs->cs->write_tasklet); |
| 591 | spin_unlock_irqrestore(&bcs->cs->lock, flags); |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 592 | |
| 593 | return len; /* ok so far */ |
| 594 | } |
Adrian Bunk | d5c1682 | 2007-02-20 13:58:17 -0800 | [diff] [blame^] | 595 | EXPORT_SYMBOL_GPL(gigaset_m10x_send_skb); |