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 | |
| 16 | #include "gigaset.h" |
| 17 | #include <linux/crc-ccitt.h> |
Akinobu Mita | 17b3cff | 2006-12-08 02:36:30 -0800 | [diff] [blame] | 18 | #include <linux/bitrev.h> |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 19 | |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 20 | /* check if byte must be stuffed/escaped |
| 21 | * I'm not sure which data should be encoded. |
| 22 | * Therefore I will go the hard way and decode every value |
| 23 | * less than 0x20, the flag sequence and the control escape char. |
| 24 | */ |
| 25 | static inline int muststuff(unsigned char c) |
| 26 | { |
| 27 | if (c < PPP_TRANS) return 1; |
| 28 | if (c == PPP_FLAG) return 1; |
| 29 | if (c == PPP_ESCAPE) return 1; |
| 30 | /* other possible candidates: */ |
| 31 | /* 0x91: XON with parity set */ |
| 32 | /* 0x93: XOFF with parity set */ |
| 33 | return 0; |
| 34 | } |
| 35 | |
| 36 | /* == data input =========================================================== */ |
| 37 | |
| 38 | /* process a block of received bytes in command mode (modem response) |
| 39 | * Return value: |
| 40 | * number of processed bytes |
| 41 | */ |
| 42 | 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] | 43 | struct inbuf_t *inbuf) |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 44 | { |
| 45 | struct cardstate *cs = inbuf->cs; |
| 46 | unsigned cbytes = cs->cbytes; |
| 47 | int inputstate = inbuf->inputstate; |
| 48 | int startbytes = numbytes; |
| 49 | |
| 50 | for (;;) { |
| 51 | cs->respdata[cbytes] = c; |
| 52 | if (c == 10 || c == 13) { |
Tilman Schmidt | 784d585 | 2006-04-10 22:55:04 -0700 | [diff] [blame] | 53 | gig_dbg(DEBUG_TRANSCMD, "%s: End of Command (%d Bytes)", |
| 54 | __func__, cbytes); |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 55 | cs->cbytes = cbytes; |
Tilman Schmidt | 917f508 | 2006-04-10 22:55:00 -0700 | [diff] [blame] | 56 | gigaset_handle_modem_response(cs); /* can change |
| 57 | cs->dle */ |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 58 | cbytes = 0; |
| 59 | |
| 60 | if (cs->dle && |
| 61 | !(inputstate & INS_DLE_command)) { |
| 62 | inputstate &= ~INS_command; |
| 63 | break; |
| 64 | } |
| 65 | } else { |
| 66 | /* advance in line buffer, checking for overflow */ |
| 67 | if (cbytes < MAX_RESP_SIZE - 1) |
| 68 | cbytes++; |
| 69 | else |
Tilman Schmidt | 784d585 | 2006-04-10 22:55:04 -0700 | [diff] [blame] | 70 | dev_warn(cs->dev, "response too large\n"); |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 71 | } |
| 72 | |
| 73 | if (!numbytes) |
| 74 | break; |
| 75 | c = *src++; |
| 76 | --numbytes; |
| 77 | if (c == DLE_FLAG && |
| 78 | (cs->dle || inputstate & INS_DLE_command)) { |
| 79 | inputstate |= INS_DLE_char; |
| 80 | break; |
| 81 | } |
| 82 | } |
| 83 | |
| 84 | cs->cbytes = cbytes; |
| 85 | inbuf->inputstate = inputstate; |
| 86 | |
| 87 | return startbytes - numbytes; |
| 88 | } |
| 89 | |
| 90 | /* process a block of received bytes in lock mode (tty i/f) |
| 91 | * Return value: |
| 92 | * number of processed bytes |
| 93 | */ |
| 94 | static inline int lock_loop(unsigned char *src, int numbytes, |
Tilman Schmidt | 784d585 | 2006-04-10 22:55:04 -0700 | [diff] [blame] | 95 | struct inbuf_t *inbuf) |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 96 | { |
| 97 | struct cardstate *cs = inbuf->cs; |
| 98 | |
Tilman Schmidt | 917f508 | 2006-04-10 22:55:00 -0700 | [diff] [blame] | 99 | gigaset_dbg_buffer(DEBUG_LOCKCMD, "received response", |
Tilman Schmidt | 0137150 | 2006-04-10 22:55:11 -0700 | [diff] [blame] | 100 | numbytes, src); |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 101 | gigaset_if_receive(cs, src, numbytes); |
| 102 | |
| 103 | return numbytes; |
| 104 | } |
| 105 | |
| 106 | /* process a block of received bytes in HDLC data mode |
| 107 | * Collect HDLC frames, undoing byte stuffing and watching for DLE escapes. |
| 108 | * When a frame is complete, check the FCS and pass valid frames to the LL. |
| 109 | * If DLE is encountered, return immediately to let the caller handle it. |
| 110 | * Return value: |
| 111 | * number of processed bytes |
| 112 | * numbytes (all bytes processed) on error --FIXME |
| 113 | */ |
| 114 | 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] | 115 | struct inbuf_t *inbuf) |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 116 | { |
| 117 | struct cardstate *cs = inbuf->cs; |
| 118 | struct bc_state *bcs = inbuf->bcs; |
Tilman Schmidt | d48c778 | 2006-04-10 22:55:08 -0700 | [diff] [blame] | 119 | int inputstate = bcs->inputstate; |
| 120 | __u16 fcs = bcs->fcs; |
| 121 | struct sk_buff *skb = bcs->skb; |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 122 | int startbytes = numbytes; |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 123 | |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 124 | if (unlikely(inputstate & INS_byte_stuff)) { |
| 125 | inputstate &= ~INS_byte_stuff; |
| 126 | goto byte_stuff; |
| 127 | } |
| 128 | for (;;) { |
| 129 | if (unlikely(c == PPP_ESCAPE)) { |
| 130 | if (unlikely(!numbytes)) { |
| 131 | inputstate |= INS_byte_stuff; |
| 132 | break; |
| 133 | } |
| 134 | c = *src++; |
| 135 | --numbytes; |
| 136 | if (unlikely(c == DLE_FLAG && |
| 137 | (cs->dle || |
| 138 | inbuf->inputstate & INS_DLE_command))) { |
| 139 | inbuf->inputstate |= INS_DLE_char; |
| 140 | inputstate |= INS_byte_stuff; |
| 141 | break; |
| 142 | } |
| 143 | byte_stuff: |
| 144 | c ^= PPP_TRANS; |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 145 | if (unlikely(!muststuff(c))) |
Tilman Schmidt | 784d585 | 2006-04-10 22:55:04 -0700 | [diff] [blame] | 146 | gig_dbg(DEBUG_HDLC, "byte stuffed: 0x%02x", c); |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 147 | } else if (unlikely(c == PPP_FLAG)) { |
| 148 | if (unlikely(inputstate & INS_skip_frame)) { |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 149 | #ifdef CONFIG_GIGASET_DEBUG |
Tilman Schmidt | 236b87c | 2008-12-26 01:22:03 -0800 | [diff] [blame] | 150 | if (!(inputstate & INS_have_data)) { /* 7E 7E */ |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 151 | ++bcs->emptycount; |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 152 | } else |
Tilman Schmidt | 784d585 | 2006-04-10 22:55:04 -0700 | [diff] [blame] | 153 | gig_dbg(DEBUG_HDLC, |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 154 | "7e----------------------------"); |
Tilman Schmidt | 236b87c | 2008-12-26 01:22:03 -0800 | [diff] [blame] | 155 | #endif |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 156 | |
| 157 | /* end of frame */ |
Tilman Schmidt | 088ec0c | 2009-10-06 12:19:07 +0000 | [diff] [blame] | 158 | gigaset_isdn_rcv_err(bcs); |
| 159 | dev_kfree_skb(skb); |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 160 | } else if (!(inputstate & INS_have_data)) { /* 7E 7E */ |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 161 | #ifdef CONFIG_GIGASET_DEBUG |
| 162 | ++bcs->emptycount; |
| 163 | #endif |
| 164 | break; |
| 165 | } else { |
Tilman Schmidt | 784d585 | 2006-04-10 22:55:04 -0700 | [diff] [blame] | 166 | gig_dbg(DEBUG_HDLC, |
| 167 | "7e----------------------------"); |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 168 | |
| 169 | /* end of frame */ |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 170 | if (unlikely(fcs != PPP_GOODFCS)) { |
Tilman Schmidt | 784d585 | 2006-04-10 22:55:04 -0700 | [diff] [blame] | 171 | dev_err(cs->dev, |
Tilman Schmidt | 0a30572 | 2009-05-13 12:44:18 +0000 | [diff] [blame] | 172 | "Checksum failed, %u bytes corrupted!\n", |
| 173 | skb->len); |
Tilman Schmidt | 088ec0c | 2009-10-06 12:19:07 +0000 | [diff] [blame] | 174 | gigaset_isdn_rcv_err(bcs); |
| 175 | dev_kfree_skb(skb); |
| 176 | } else if (likely(skb->len > 2)) { |
| 177 | __skb_trim(skb, skb->len - 2); |
| 178 | gigaset_skb_rcvd(bcs, skb); |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 179 | } else { |
Tilman Schmidt | 088ec0c | 2009-10-06 12:19:07 +0000 | [diff] [blame] | 180 | if (skb->len) { |
| 181 | dev_err(cs->dev, |
| 182 | "invalid packet size (%d)\n", skb->len); |
| 183 | gigaset_isdn_rcv_err(bcs); |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 184 | } |
Tilman Schmidt | 088ec0c | 2009-10-06 12:19:07 +0000 | [diff] [blame] | 185 | dev_kfree_skb(skb); |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 186 | } |
| 187 | } |
| 188 | |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 189 | fcs = PPP_INITFCS; |
| 190 | inputstate &= ~(INS_have_data | INS_skip_frame); |
| 191 | if (unlikely(bcs->ignore)) { |
| 192 | inputstate |= INS_skip_frame; |
| 193 | skb = NULL; |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 194 | } else { |
Tilman Schmidt | 088ec0c | 2009-10-06 12:19:07 +0000 | [diff] [blame] | 195 | skb = dev_alloc_skb(SBUFSIZE + cs->hw_hdr_len); |
| 196 | if (skb != NULL) { |
| 197 | skb_reserve(skb, cs->hw_hdr_len); |
| 198 | } else { |
| 199 | dev_warn(cs->dev, |
| 200 | "could not allocate new skb\n"); |
| 201 | inputstate |= INS_skip_frame; |
| 202 | } |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 203 | } |
| 204 | |
| 205 | break; |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 206 | } else if (unlikely(muststuff(c))) { |
| 207 | /* Should not happen. Possible after ZDLE=1<CR><LF>. */ |
Tilman Schmidt | 784d585 | 2006-04-10 22:55:04 -0700 | [diff] [blame] | 208 | gig_dbg(DEBUG_HDLC, "not byte stuffed: 0x%02x", c); |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 209 | } |
| 210 | |
| 211 | /* add character */ |
| 212 | |
| 213 | #ifdef CONFIG_GIGASET_DEBUG |
| 214 | if (unlikely(!(inputstate & INS_have_data))) { |
Tilman Schmidt | 784d585 | 2006-04-10 22:55:04 -0700 | [diff] [blame] | 215 | gig_dbg(DEBUG_HDLC, "7e (%d x) ================", |
| 216 | bcs->emptycount); |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 217 | bcs->emptycount = 0; |
| 218 | } |
| 219 | #endif |
| 220 | |
| 221 | inputstate |= INS_have_data; |
| 222 | |
| 223 | if (likely(!(inputstate & INS_skip_frame))) { |
| 224 | if (unlikely(skb->len == SBUFSIZE)) { |
Tilman Schmidt | 784d585 | 2006-04-10 22:55:04 -0700 | [diff] [blame] | 225 | dev_warn(cs->dev, "received packet too long\n"); |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 226 | dev_kfree_skb_any(skb); |
| 227 | skb = NULL; |
| 228 | inputstate |= INS_skip_frame; |
| 229 | break; |
| 230 | } |
Tilman Schmidt | 443e1f4 | 2006-04-10 22:55:13 -0700 | [diff] [blame] | 231 | *__skb_put(skb, 1) = c; |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 232 | fcs = crc_ccitt_byte(fcs, c); |
| 233 | } |
| 234 | |
| 235 | if (unlikely(!numbytes)) |
| 236 | break; |
| 237 | c = *src++; |
| 238 | --numbytes; |
| 239 | if (unlikely(c == DLE_FLAG && |
| 240 | (cs->dle || |
| 241 | inbuf->inputstate & INS_DLE_command))) { |
| 242 | inbuf->inputstate |= INS_DLE_char; |
| 243 | break; |
| 244 | } |
| 245 | } |
| 246 | bcs->inputstate = inputstate; |
| 247 | bcs->fcs = fcs; |
| 248 | bcs->skb = skb; |
| 249 | return startbytes - numbytes; |
| 250 | } |
| 251 | |
| 252 | /* process a block of received bytes in transparent data mode |
| 253 | * Invert bytes, undoing byte stuffing and watching for DLE escapes. |
| 254 | * If DLE is encountered, return immediately to let the caller handle it. |
| 255 | * Return value: |
| 256 | * number of processed bytes |
| 257 | * numbytes (all bytes processed) on error --FIXME |
| 258 | */ |
| 259 | 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] | 260 | struct inbuf_t *inbuf) |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 261 | { |
| 262 | struct cardstate *cs = inbuf->cs; |
| 263 | struct bc_state *bcs = inbuf->bcs; |
Tilman Schmidt | d48c778 | 2006-04-10 22:55:08 -0700 | [diff] [blame] | 264 | int inputstate = bcs->inputstate; |
| 265 | struct sk_buff *skb = bcs->skb; |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 266 | int startbytes = numbytes; |
| 267 | |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 268 | for (;;) { |
| 269 | /* add character */ |
| 270 | inputstate |= INS_have_data; |
| 271 | |
| 272 | if (likely(!(inputstate & INS_skip_frame))) { |
| 273 | if (unlikely(skb->len == SBUFSIZE)) { |
| 274 | //FIXME just pass skb up and allocate a new one |
Tilman Schmidt | 784d585 | 2006-04-10 22:55:04 -0700 | [diff] [blame] | 275 | dev_warn(cs->dev, "received packet too long\n"); |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 276 | dev_kfree_skb_any(skb); |
| 277 | skb = NULL; |
| 278 | inputstate |= INS_skip_frame; |
| 279 | break; |
| 280 | } |
Akinobu Mita | 17b3cff | 2006-12-08 02:36:30 -0800 | [diff] [blame] | 281 | *__skb_put(skb, 1) = bitrev8(c); |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 282 | } |
| 283 | |
| 284 | if (unlikely(!numbytes)) |
| 285 | break; |
| 286 | c = *src++; |
| 287 | --numbytes; |
| 288 | if (unlikely(c == DLE_FLAG && |
| 289 | (cs->dle || |
| 290 | inbuf->inputstate & INS_DLE_command))) { |
| 291 | inbuf->inputstate |= INS_DLE_char; |
| 292 | break; |
| 293 | } |
| 294 | } |
| 295 | |
| 296 | /* pass data up */ |
| 297 | if (likely(inputstate & INS_have_data)) { |
| 298 | if (likely(!(inputstate & INS_skip_frame))) { |
Tilman Schmidt | 088ec0c | 2009-10-06 12:19:07 +0000 | [diff] [blame] | 299 | gigaset_skb_rcvd(bcs, skb); |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 300 | } |
| 301 | inputstate &= ~(INS_have_data | INS_skip_frame); |
| 302 | if (unlikely(bcs->ignore)) { |
| 303 | inputstate |= INS_skip_frame; |
| 304 | skb = NULL; |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 305 | } else { |
Tilman Schmidt | 088ec0c | 2009-10-06 12:19:07 +0000 | [diff] [blame] | 306 | skb = dev_alloc_skb(SBUFSIZE + cs->hw_hdr_len); |
| 307 | if (skb != NULL) { |
| 308 | skb_reserve(skb, cs->hw_hdr_len); |
| 309 | } else { |
| 310 | dev_warn(cs->dev, |
| 311 | "could not allocate new skb\n"); |
| 312 | inputstate |= INS_skip_frame; |
| 313 | } |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 314 | } |
| 315 | } |
| 316 | |
| 317 | bcs->inputstate = inputstate; |
| 318 | bcs->skb = skb; |
| 319 | return startbytes - numbytes; |
| 320 | } |
| 321 | |
Tilman Schmidt | 1cec972 | 2009-10-06 12:19:01 +0000 | [diff] [blame] | 322 | /** |
| 323 | * gigaset_m10x_input() - process a block of data received from the device |
| 324 | * @inbuf: received data and device descriptor structure. |
| 325 | * |
| 326 | * Called by hardware module {ser,usb}_gigaset with a block of received |
| 327 | * bytes. Separates the bytes received over the serial data channel into |
| 328 | * user data and command replies (locked/unlocked) according to the |
| 329 | * current state of the interface. |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 330 | */ |
| 331 | void gigaset_m10x_input(struct inbuf_t *inbuf) |
| 332 | { |
| 333 | struct cardstate *cs; |
| 334 | unsigned tail, head, numbytes; |
| 335 | unsigned char *src, c; |
| 336 | int procbytes; |
| 337 | |
Tilman Schmidt | 9d4bee2 | 2008-02-06 01:38:28 -0800 | [diff] [blame] | 338 | head = inbuf->head; |
| 339 | tail = inbuf->tail; |
Tilman Schmidt | 784d585 | 2006-04-10 22:55:04 -0700 | [diff] [blame] | 340 | gig_dbg(DEBUG_INTR, "buffer state: %u -> %u", head, tail); |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 341 | |
| 342 | if (head != tail) { |
| 343 | cs = inbuf->cs; |
| 344 | src = inbuf->data + head; |
| 345 | numbytes = (head > tail ? RBUFSIZE : tail) - head; |
Tilman Schmidt | 784d585 | 2006-04-10 22:55:04 -0700 | [diff] [blame] | 346 | gig_dbg(DEBUG_INTR, "processing %u bytes", numbytes); |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 347 | |
| 348 | while (numbytes) { |
Tilman Schmidt | 9d4bee2 | 2008-02-06 01:38:28 -0800 | [diff] [blame] | 349 | if (cs->mstate == MS_LOCKED) { |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 350 | procbytes = lock_loop(src, numbytes, inbuf); |
| 351 | src += procbytes; |
| 352 | numbytes -= procbytes; |
| 353 | } else { |
| 354 | c = *src++; |
| 355 | --numbytes; |
| 356 | if (c == DLE_FLAG && (cs->dle || |
| 357 | inbuf->inputstate & INS_DLE_command)) { |
| 358 | if (!(inbuf->inputstate & INS_DLE_char)) { |
| 359 | inbuf->inputstate |= INS_DLE_char; |
| 360 | goto nextbyte; |
| 361 | } |
| 362 | /* <DLE> <DLE> => <DLE> in data stream */ |
| 363 | inbuf->inputstate &= ~INS_DLE_char; |
| 364 | } |
| 365 | |
| 366 | if (!(inbuf->inputstate & INS_DLE_char)) { |
| 367 | |
Tilman Schmidt | 917f508 | 2006-04-10 22:55:00 -0700 | [diff] [blame] | 368 | /* FIXME use function pointers? */ |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 369 | if (inbuf->inputstate & INS_command) |
| 370 | procbytes = cmd_loop(c, src, numbytes, inbuf); |
Tilman Schmidt | 088ec0c | 2009-10-06 12:19:07 +0000 | [diff] [blame] | 371 | else if (inbuf->bcs->proto2 == L2_HDLC) |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 372 | procbytes = hdlc_loop(c, src, numbytes, inbuf); |
| 373 | else |
| 374 | procbytes = iraw_loop(c, src, numbytes, inbuf); |
| 375 | |
| 376 | src += procbytes; |
| 377 | numbytes -= procbytes; |
Tilman Schmidt | 784d585 | 2006-04-10 22:55:04 -0700 | [diff] [blame] | 378 | } else { /* DLE char */ |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 379 | inbuf->inputstate &= ~INS_DLE_char; |
| 380 | switch (c) { |
| 381 | case 'X': /*begin of command*/ |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 382 | if (inbuf->inputstate & INS_command) |
Tilman Schmidt | 236b87c | 2008-12-26 01:22:03 -0800 | [diff] [blame] | 383 | dev_warn(cs->dev, |
Tilman Schmidt | 784d585 | 2006-04-10 22:55:04 -0700 | [diff] [blame] | 384 | "received <DLE> 'X' in command mode\n"); |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 385 | inbuf->inputstate |= |
| 386 | INS_command | INS_DLE_command; |
| 387 | break; |
| 388 | case '.': /*end of command*/ |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 389 | if (!(inbuf->inputstate & INS_command)) |
Tilman Schmidt | 236b87c | 2008-12-26 01:22:03 -0800 | [diff] [blame] | 390 | dev_warn(cs->dev, |
Tilman Schmidt | 784d585 | 2006-04-10 22:55:04 -0700 | [diff] [blame] | 391 | "received <DLE> '.' in hdlc mode\n"); |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 392 | inbuf->inputstate &= cs->dle ? |
| 393 | ~(INS_DLE_command|INS_command) |
| 394 | : ~INS_DLE_command; |
| 395 | break; |
| 396 | //case DLE_FLAG: /*DLE_FLAG in data stream*/ /* schon oben behandelt! */ |
| 397 | default: |
Tilman Schmidt | 784d585 | 2006-04-10 22:55:04 -0700 | [diff] [blame] | 398 | dev_err(cs->dev, |
| 399 | "received 0x10 0x%02x!\n", |
| 400 | (int) c); |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 401 | /* FIXME: reset driver?? */ |
| 402 | } |
| 403 | } |
| 404 | } |
| 405 | nextbyte: |
| 406 | if (!numbytes) { |
| 407 | /* end of buffer, check for wrap */ |
| 408 | if (head > tail) { |
| 409 | head = 0; |
| 410 | src = inbuf->data; |
| 411 | numbytes = tail; |
| 412 | } else { |
| 413 | head = tail; |
| 414 | break; |
| 415 | } |
| 416 | } |
| 417 | } |
| 418 | |
Tilman Schmidt | 784d585 | 2006-04-10 22:55:04 -0700 | [diff] [blame] | 419 | gig_dbg(DEBUG_INTR, "setting head to %u", head); |
Tilman Schmidt | 9d4bee2 | 2008-02-06 01:38:28 -0800 | [diff] [blame] | 420 | inbuf->head = head; |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 421 | } |
| 422 | } |
Adrian Bunk | d5c1682 | 2007-02-20 13:58:17 -0800 | [diff] [blame] | 423 | EXPORT_SYMBOL_GPL(gigaset_m10x_input); |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 424 | |
| 425 | |
| 426 | /* == data output ========================================================== */ |
| 427 | |
Tilman Schmidt | 088ec0c | 2009-10-06 12:19:07 +0000 | [diff] [blame] | 428 | /* |
| 429 | * Encode a data packet into an octet stuffed HDLC frame with FCS, |
| 430 | * opening and closing flags, preserving headroom data. |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 431 | * parameters: |
Tilman Schmidt | 088ec0c | 2009-10-06 12:19:07 +0000 | [diff] [blame] | 432 | * skb skb containing original packet (freed upon return) |
| 433 | * headroom number of headroom bytes to preserve |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 434 | * Return value: |
| 435 | * pointer to newly allocated skb containing the result frame |
| 436 | */ |
Tilman Schmidt | 088ec0c | 2009-10-06 12:19:07 +0000 | [diff] [blame] | 437 | static struct sk_buff *HDLC_Encode(struct sk_buff *skb, int headroom) |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 438 | { |
| 439 | struct sk_buff *hdlc_skb; |
| 440 | __u16 fcs; |
| 441 | unsigned char c; |
| 442 | unsigned char *cp; |
| 443 | int len; |
| 444 | unsigned int stuf_cnt; |
| 445 | |
| 446 | stuf_cnt = 0; |
| 447 | fcs = PPP_INITFCS; |
| 448 | cp = skb->data; |
| 449 | len = skb->len; |
| 450 | while (len--) { |
| 451 | if (muststuff(*cp)) |
| 452 | stuf_cnt++; |
| 453 | fcs = crc_ccitt_byte(fcs, *cp++); |
| 454 | } |
Tilman Schmidt | 784d585 | 2006-04-10 22:55:04 -0700 | [diff] [blame] | 455 | fcs ^= 0xffff; /* complement */ |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 456 | |
| 457 | /* size of new buffer: original size + number of stuffing bytes |
| 458 | * + 2 bytes FCS + 2 stuffing bytes for FCS (if needed) + 2 flag bytes |
Tilman Schmidt | 088ec0c | 2009-10-06 12:19:07 +0000 | [diff] [blame] | 459 | * + room for acknowledgement header |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 460 | */ |
Tilman Schmidt | 088ec0c | 2009-10-06 12:19:07 +0000 | [diff] [blame] | 461 | hdlc_skb = dev_alloc_skb(skb->len + stuf_cnt + 6 + headroom); |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 462 | if (!hdlc_skb) { |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 463 | dev_kfree_skb(skb); |
| 464 | return NULL; |
| 465 | } |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 466 | |
Tilman Schmidt | 088ec0c | 2009-10-06 12:19:07 +0000 | [diff] [blame] | 467 | /* Copy acknowledgement header into new skb */ |
| 468 | skb_reserve(hdlc_skb, headroom); |
| 469 | memcpy(hdlc_skb->head, skb->head, headroom); |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 470 | |
| 471 | /* Add flag sequence in front of everything.. */ |
| 472 | *(skb_put(hdlc_skb, 1)) = PPP_FLAG; |
| 473 | |
| 474 | /* Perform byte stuffing while copying data. */ |
| 475 | while (skb->len--) { |
| 476 | if (muststuff(*skb->data)) { |
| 477 | *(skb_put(hdlc_skb, 1)) = PPP_ESCAPE; |
| 478 | *(skb_put(hdlc_skb, 1)) = (*skb->data++) ^ PPP_TRANS; |
| 479 | } else |
| 480 | *(skb_put(hdlc_skb, 1)) = *skb->data++; |
| 481 | } |
| 482 | |
| 483 | /* Finally add FCS (byte stuffed) and flag sequence */ |
Tilman Schmidt | 784d585 | 2006-04-10 22:55:04 -0700 | [diff] [blame] | 484 | c = (fcs & 0x00ff); /* least significant byte first */ |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 485 | if (muststuff(c)) { |
| 486 | *(skb_put(hdlc_skb, 1)) = PPP_ESCAPE; |
| 487 | c ^= PPP_TRANS; |
| 488 | } |
| 489 | *(skb_put(hdlc_skb, 1)) = c; |
| 490 | |
| 491 | c = ((fcs >> 8) & 0x00ff); |
| 492 | if (muststuff(c)) { |
| 493 | *(skb_put(hdlc_skb, 1)) = PPP_ESCAPE; |
| 494 | c ^= PPP_TRANS; |
| 495 | } |
| 496 | *(skb_put(hdlc_skb, 1)) = c; |
| 497 | |
| 498 | *(skb_put(hdlc_skb, 1)) = PPP_FLAG; |
| 499 | |
| 500 | dev_kfree_skb(skb); |
| 501 | return hdlc_skb; |
| 502 | } |
| 503 | |
Tilman Schmidt | 088ec0c | 2009-10-06 12:19:07 +0000 | [diff] [blame] | 504 | /* |
| 505 | * Encode a data packet into an octet stuffed raw bit inverted frame, |
| 506 | * preserving headroom data. |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 507 | * parameters: |
Tilman Schmidt | 088ec0c | 2009-10-06 12:19:07 +0000 | [diff] [blame] | 508 | * skb skb containing original packet (freed upon return) |
| 509 | * headroom number of headroom bytes to preserve |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 510 | * Return value: |
| 511 | * pointer to newly allocated skb containing the result frame |
| 512 | */ |
Tilman Schmidt | 088ec0c | 2009-10-06 12:19:07 +0000 | [diff] [blame] | 513 | static struct sk_buff *iraw_encode(struct sk_buff *skb, int headroom) |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 514 | { |
| 515 | struct sk_buff *iraw_skb; |
| 516 | unsigned char c; |
| 517 | unsigned char *cp; |
| 518 | int len; |
| 519 | |
| 520 | /* worst case: every byte must be stuffed */ |
Tilman Schmidt | 088ec0c | 2009-10-06 12:19:07 +0000 | [diff] [blame] | 521 | iraw_skb = dev_alloc_skb(2*skb->len + headroom); |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 522 | if (!iraw_skb) { |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 523 | dev_kfree_skb(skb); |
| 524 | return NULL; |
| 525 | } |
Tilman Schmidt | 088ec0c | 2009-10-06 12:19:07 +0000 | [diff] [blame] | 526 | |
| 527 | /* Copy acknowledgement header into new skb */ |
| 528 | skb_reserve(iraw_skb, headroom); |
| 529 | memcpy(iraw_skb->head, skb->head, headroom); |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 530 | |
| 531 | cp = skb->data; |
| 532 | len = skb->len; |
| 533 | while (len--) { |
Akinobu Mita | 17b3cff | 2006-12-08 02:36:30 -0800 | [diff] [blame] | 534 | c = bitrev8(*cp++); |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 535 | if (c == DLE_FLAG) |
| 536 | *(skb_put(iraw_skb, 1)) = c; |
| 537 | *(skb_put(iraw_skb, 1)) = c; |
| 538 | } |
| 539 | dev_kfree_skb(skb); |
| 540 | return iraw_skb; |
| 541 | } |
| 542 | |
Tilman Schmidt | 1cec972 | 2009-10-06 12:19:01 +0000 | [diff] [blame] | 543 | /** |
| 544 | * gigaset_m10x_send_skb() - queue an skb for sending |
| 545 | * @bcs: B channel descriptor structure. |
| 546 | * @skb: data to send. |
| 547 | * |
Tilman Schmidt | 088ec0c | 2009-10-06 12:19:07 +0000 | [diff] [blame] | 548 | * Called by LL to encode and queue an skb for sending, and start |
Tilman Schmidt | 1cec972 | 2009-10-06 12:19:01 +0000 | [diff] [blame] | 549 | * transmission if necessary. |
Tilman Schmidt | 088ec0c | 2009-10-06 12:19:07 +0000 | [diff] [blame] | 550 | * Once the payload data has been transmitted completely, gigaset_skb_sent() |
| 551 | * will be called with the first cs->hw_hdr_len bytes of skb->head preserved. |
Tilman Schmidt | 1cec972 | 2009-10-06 12:19:01 +0000 | [diff] [blame] | 552 | * |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 553 | * Return value: |
Tilman Schmidt | 1cec972 | 2009-10-06 12:19:01 +0000 | [diff] [blame] | 554 | * number of bytes accepted for sending (skb->len) if ok, |
| 555 | * error code < 0 (eg. -ENOMEM) on error |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 556 | */ |
| 557 | int gigaset_m10x_send_skb(struct bc_state *bcs, struct sk_buff *skb) |
| 558 | { |
Tilman Schmidt | d48c778 | 2006-04-10 22:55:08 -0700 | [diff] [blame] | 559 | unsigned len = skb->len; |
Tilman Schmidt | 69049cc | 2006-04-10 22:55:16 -0700 | [diff] [blame] | 560 | unsigned long flags; |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 561 | |
Tilman Schmidt | 088ec0c | 2009-10-06 12:19:07 +0000 | [diff] [blame] | 562 | if (bcs->proto2 == L2_HDLC) |
| 563 | skb = HDLC_Encode(skb, bcs->cs->hw_hdr_len); |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 564 | else |
Tilman Schmidt | 088ec0c | 2009-10-06 12:19:07 +0000 | [diff] [blame] | 565 | skb = iraw_encode(skb, bcs->cs->hw_hdr_len); |
Tilman Schmidt | 784d585 | 2006-04-10 22:55:04 -0700 | [diff] [blame] | 566 | if (!skb) { |
Tilman Schmidt | 5002779 | 2008-07-23 21:28:27 -0700 | [diff] [blame] | 567 | dev_err(bcs->cs->dev, |
| 568 | "unable to allocate memory for encoding!\n"); |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 569 | return -ENOMEM; |
Tilman Schmidt | 784d585 | 2006-04-10 22:55:04 -0700 | [diff] [blame] | 570 | } |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 571 | |
| 572 | skb_queue_tail(&bcs->squeue, skb); |
Tilman Schmidt | 69049cc | 2006-04-10 22:55:16 -0700 | [diff] [blame] | 573 | spin_lock_irqsave(&bcs->cs->lock, flags); |
| 574 | if (bcs->cs->connected) |
| 575 | tasklet_schedule(&bcs->cs->write_tasklet); |
| 576 | spin_unlock_irqrestore(&bcs->cs->lock, flags); |
Hansjoerg Lipp | 07dc1f9 | 2006-03-26 01:38:37 -0800 | [diff] [blame] | 577 | |
| 578 | return len; /* ok so far */ |
| 579 | } |
Adrian Bunk | d5c1682 | 2007-02-20 13:58:17 -0800 | [diff] [blame] | 580 | EXPORT_SYMBOL_GPL(gigaset_m10x_send_skb); |