| 1 | /* |
| 2 | * Shared Transport Line discipline driver Core |
| 3 | * This hooks up ST KIM driver and ST LL driver |
| 4 | * Copyright (C) 2009 Texas Instruments |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License version 2 as |
| 8 | * published by the Free Software Foundation. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License |
| 16 | * along with this program; if not, write to the Free Software |
| 17 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 18 | * |
| 19 | */ |
| 20 | |
| 21 | #define pr_fmt(fmt) "(stc): " fmt |
| 22 | #include <linux/module.h> |
| 23 | #include <linux/kernel.h> |
| 24 | #include <linux/init.h> |
| 25 | #include <linux/tty.h> |
| 26 | |
| 27 | /* understand BT, FM and GPS for now */ |
| 28 | #include <net/bluetooth/bluetooth.h> |
| 29 | #include <net/bluetooth/hci_core.h> |
| 30 | #include <net/bluetooth/hci.h> |
| 31 | #include "fm.h" |
| 32 | /* |
| 33 | * packet formats for fm and gps |
| 34 | * #include "gps.h" |
| 35 | */ |
| 36 | #include "st_core.h" |
| 37 | #include "st_kim.h" |
| 38 | #include "st_ll.h" |
| 39 | #include "st.h" |
| 40 | |
| 41 | #ifdef DEBUG |
| 42 | /* strings to be used for rfkill entries and by |
| 43 | * ST Core to be used for sysfs debug entry |
| 44 | */ |
| 45 | #define PROTO_ENTRY(type, name) name |
| 46 | const unsigned char *protocol_strngs[] = { |
| 47 | PROTO_ENTRY(ST_BT, "Bluetooth"), |
| 48 | PROTO_ENTRY(ST_FM, "FM"), |
| 49 | PROTO_ENTRY(ST_GPS, "GPS"), |
| 50 | }; |
| 51 | #endif |
| 52 | /* function pointer pointing to either, |
| 53 | * st_kim_recv during registration to receive fw download responses |
| 54 | * st_int_recv after registration to receive proto stack responses |
| 55 | */ |
| 56 | void (*st_recv) (void*, const unsigned char*, long); |
| 57 | |
| 58 | /********************************************************************/ |
| 59 | #if 0 |
| 60 | /* internal misc functions */ |
| 61 | bool is_protocol_list_empty(void) |
| 62 | { |
| 63 | unsigned char i = 0; |
| 64 | pr_info(" %s ", __func__); |
| 65 | for (i = 0; i < ST_MAX; i++) { |
| 66 | if (st_gdata->list[i] != NULL) |
| 67 | return ST_NOTEMPTY; |
| 68 | /* not empty */ |
| 69 | } |
| 70 | /* list empty */ |
| 71 | return ST_EMPTY; |
| 72 | } |
| 73 | #endif |
| 74 | /* can be called in from |
| 75 | * -- KIM (during fw download) |
| 76 | * -- ST Core (during st_write) |
| 77 | * |
| 78 | * This is the internal write function - a wrapper |
| 79 | * to tty->ops->write |
| 80 | */ |
| 81 | int st_int_write(struct st_data_s *st_gdata, |
| 82 | const unsigned char *data, int count) |
| 83 | { |
| 84 | #ifdef VERBOSE /* for debug */ |
| 85 | int i; |
| 86 | #endif |
| 87 | struct tty_struct *tty; |
| 88 | if (unlikely(st_gdata == NULL || st_gdata->tty == NULL)) { |
| 89 | pr_err("tty unavailable to perform write"); |
| 90 | return ST_ERR_FAILURE; |
| 91 | } |
| 92 | tty = st_gdata->tty; |
| 93 | #ifdef VERBOSE |
| 94 | printk(KERN_ERR "start data..\n"); |
| 95 | for (i = 0; i < count; i++) /* no newlines for each datum */ |
| 96 | printk(" %x", data[i]); |
| 97 | printk(KERN_ERR "\n ..end data\n"); |
| 98 | #endif |
| 99 | return tty->ops->write(tty, data, count); |
| 100 | |
| 101 | } |
| 102 | |
| 103 | /* |
| 104 | * push the skb received to relevant |
| 105 | * protocol stacks |
| 106 | */ |
| 107 | void st_send_frame(enum proto_type protoid, struct st_data_s *st_gdata) |
| 108 | { |
| 109 | pr_info(" %s(prot:%d) ", __func__, protoid); |
| 110 | |
| 111 | if (unlikely |
| 112 | (st_gdata == NULL || st_gdata->rx_skb == NULL |
| 113 | || st_gdata->list[protoid] == NULL)) { |
| 114 | pr_err("protocol %d not registered, no data to send?", |
| 115 | protoid); |
| 116 | kfree_skb(st_gdata->rx_skb); |
| 117 | return; |
| 118 | } |
| 119 | /* this cannot fail |
| 120 | * this shouldn't take long |
| 121 | * - should be just skb_queue_tail for the |
| 122 | * protocol stack driver |
| 123 | */ |
| 124 | if (likely(st_gdata->list[protoid]->recv != NULL)) { |
| 125 | if (unlikely(st_gdata->list[protoid]->recv(st_gdata->rx_skb) |
| 126 | != ST_SUCCESS)) { |
| 127 | pr_err(" proto stack %d's ->recv failed", protoid); |
| 128 | kfree_skb(st_gdata->rx_skb); |
| 129 | return; |
| 130 | } |
| 131 | } else { |
| 132 | pr_err(" proto stack %d's ->recv null", protoid); |
| 133 | kfree_skb(st_gdata->rx_skb); |
| 134 | } |
| 135 | pr_info(" done %s", __func__); |
| 136 | return; |
| 137 | } |
| 138 | |
| 139 | /* |
| 140 | * to call registration complete callbacks |
| 141 | * of all protocol stack drivers |
| 142 | */ |
| 143 | void st_reg_complete(struct st_data_s *st_gdata, char err) |
| 144 | { |
| 145 | unsigned char i = 0; |
| 146 | pr_info(" %s ", __func__); |
| 147 | for (i = 0; i < ST_MAX; i++) { |
| 148 | if (likely(st_gdata != NULL && st_gdata->list[i] != NULL && |
| 149 | st_gdata->list[i]->reg_complete_cb != NULL)) |
| 150 | st_gdata->list[i]->reg_complete_cb(err); |
| 151 | } |
| 152 | } |
| 153 | |
| 154 | static inline int st_check_data_len(struct st_data_s *st_gdata, |
| 155 | int protoid, int len) |
| 156 | { |
| 157 | register int room = skb_tailroom(st_gdata->rx_skb); |
| 158 | |
| 159 | pr_info("len %d room %d", len, room); |
| 160 | |
| 161 | if (!len) { |
| 162 | /* Received packet has only packet header and |
| 163 | * has zero length payload. So, ask ST CORE to |
| 164 | * forward the packet to protocol driver (BT/FM/GPS) |
| 165 | */ |
| 166 | st_send_frame(protoid, st_gdata); |
| 167 | |
| 168 | } else if (len > room) { |
| 169 | /* Received packet's payload length is larger. |
| 170 | * We can't accommodate it in created skb. |
| 171 | */ |
| 172 | pr_err("Data length is too large len %d room %d", len, |
| 173 | room); |
| 174 | kfree_skb(st_gdata->rx_skb); |
| 175 | } else { |
| 176 | /* Packet header has non-zero payload length and |
| 177 | * we have enough space in created skb. Lets read |
| 178 | * payload data */ |
| 179 | st_gdata->rx_state = ST_BT_W4_DATA; |
| 180 | st_gdata->rx_count = len; |
| 181 | return len; |
| 182 | } |
| 183 | |
| 184 | /* Change ST state to continue to process next |
| 185 | * packet */ |
| 186 | st_gdata->rx_state = ST_W4_PACKET_TYPE; |
| 187 | st_gdata->rx_skb = NULL; |
| 188 | st_gdata->rx_count = 0; |
| 189 | |
| 190 | return 0; |
| 191 | } |
| 192 | |
| 193 | /* internal function for action when wake-up ack |
| 194 | * received |
| 195 | */ |
| 196 | static inline void st_wakeup_ack(struct st_data_s *st_gdata, |
| 197 | unsigned char cmd) |
| 198 | { |
| 199 | register struct sk_buff *waiting_skb; |
| 200 | unsigned long flags = 0; |
| 201 | |
| 202 | spin_lock_irqsave(&st_gdata->lock, flags); |
| 203 | /* de-Q from waitQ and Q in txQ now that the |
| 204 | * chip is awake |
| 205 | */ |
| 206 | while ((waiting_skb = skb_dequeue(&st_gdata->tx_waitq))) |
| 207 | skb_queue_tail(&st_gdata->txq, waiting_skb); |
| 208 | |
| 209 | /* state forwarded to ST LL */ |
| 210 | st_ll_sleep_state(st_gdata, (unsigned long)cmd); |
| 211 | spin_unlock_irqrestore(&st_gdata->lock, flags); |
| 212 | |
| 213 | /* wake up to send the recently copied skbs from waitQ */ |
| 214 | st_tx_wakeup(st_gdata); |
| 215 | } |
| 216 | |
| 217 | /* Decodes received RAW data and forwards to corresponding |
| 218 | * client drivers (Bluetooth,FM,GPS..etc). |
| 219 | * |
| 220 | */ |
| 221 | void st_int_recv(void *disc_data, |
| 222 | const unsigned char *data, long count) |
| 223 | { |
| 224 | register char *ptr; |
| 225 | struct hci_event_hdr *eh; |
| 226 | struct hci_acl_hdr *ah; |
| 227 | struct hci_sco_hdr *sh; |
| 228 | struct fm_event_hdr *fm; |
| 229 | struct gps_event_hdr *gps; |
| 230 | register int len = 0, type = 0, dlen = 0; |
| 231 | static enum proto_type protoid = ST_MAX; |
| 232 | struct st_data_s *st_gdata = (struct st_data_s *)disc_data; |
| 233 | |
| 234 | ptr = (char *)data; |
| 235 | /* tty_receive sent null ? */ |
| 236 | if (unlikely(ptr == NULL) || (st_gdata == NULL)) { |
| 237 | pr_err(" received null from TTY "); |
| 238 | return; |
| 239 | } |
| 240 | |
| 241 | pr_info("count %ld rx_state %ld" |
| 242 | "rx_count %ld", count, st_gdata->rx_state, |
| 243 | st_gdata->rx_count); |
| 244 | |
| 245 | /* Decode received bytes here */ |
| 246 | while (count) { |
| 247 | if (st_gdata->rx_count) { |
| 248 | len = min_t(unsigned int, st_gdata->rx_count, count); |
| 249 | memcpy(skb_put(st_gdata->rx_skb, len), ptr, len); |
| 250 | st_gdata->rx_count -= len; |
| 251 | count -= len; |
| 252 | ptr += len; |
| 253 | |
| 254 | if (st_gdata->rx_count) |
| 255 | continue; |
| 256 | |
| 257 | /* Check ST RX state machine , where are we? */ |
| 258 | switch (st_gdata->rx_state) { |
| 259 | |
| 260 | /* Waiting for complete packet ? */ |
| 261 | case ST_BT_W4_DATA: |
| 262 | pr_info("Complete pkt received"); |
| 263 | |
| 264 | /* Ask ST CORE to forward |
| 265 | * the packet to protocol driver */ |
| 266 | st_send_frame(protoid, st_gdata); |
| 267 | |
| 268 | st_gdata->rx_state = ST_W4_PACKET_TYPE; |
| 269 | st_gdata->rx_skb = NULL; |
| 270 | protoid = ST_MAX; /* is this required ? */ |
| 271 | continue; |
| 272 | |
| 273 | /* Waiting for Bluetooth event header ? */ |
| 274 | case ST_BT_W4_EVENT_HDR: |
| 275 | eh = (struct hci_event_hdr *)st_gdata->rx_skb-> |
| 276 | data; |
| 277 | |
| 278 | pr_info("Event header: evt 0x%2.2x" |
| 279 | "plen %d", eh->evt, eh->plen); |
| 280 | |
| 281 | st_check_data_len(st_gdata, protoid, eh->plen); |
| 282 | continue; |
| 283 | |
| 284 | /* Waiting for Bluetooth acl header ? */ |
| 285 | case ST_BT_W4_ACL_HDR: |
| 286 | ah = (struct hci_acl_hdr *)st_gdata->rx_skb-> |
| 287 | data; |
| 288 | dlen = __le16_to_cpu(ah->dlen); |
| 289 | |
| 290 | pr_info("ACL header: dlen %d", dlen); |
| 291 | |
| 292 | st_check_data_len(st_gdata, protoid, dlen); |
| 293 | continue; |
| 294 | |
| 295 | /* Waiting for Bluetooth sco header ? */ |
| 296 | case ST_BT_W4_SCO_HDR: |
| 297 | sh = (struct hci_sco_hdr *)st_gdata->rx_skb-> |
| 298 | data; |
| 299 | |
| 300 | pr_info("SCO header: dlen %d", sh->dlen); |
| 301 | |
| 302 | st_check_data_len(st_gdata, protoid, sh->dlen); |
| 303 | continue; |
| 304 | case ST_FM_W4_EVENT_HDR: |
| 305 | fm = (struct fm_event_hdr *)st_gdata->rx_skb-> |
| 306 | data; |
| 307 | pr_info("FM Header: "); |
| 308 | st_check_data_len(st_gdata, ST_FM, fm->plen); |
| 309 | continue; |
| 310 | /* TODO : Add GPS packet machine logic here */ |
| 311 | case ST_GPS_W4_EVENT_HDR: |
| 312 | /* [0x09 pkt hdr][R/W byte][2 byte len] */ |
| 313 | gps = (struct gps_event_hdr *)st_gdata->rx_skb-> |
| 314 | data; |
| 315 | pr_info("GPS Header: "); |
| 316 | st_check_data_len(st_gdata, ST_GPS, gps->plen); |
| 317 | continue; |
| 318 | } /* end of switch rx_state */ |
| 319 | } |
| 320 | |
| 321 | /* end of if rx_count */ |
| 322 | /* Check first byte of packet and identify module |
| 323 | * owner (BT/FM/GPS) */ |
| 324 | switch (*ptr) { |
| 325 | |
| 326 | /* Bluetooth event packet? */ |
| 327 | case HCI_EVENT_PKT: |
| 328 | pr_info("Event packet"); |
| 329 | st_gdata->rx_state = ST_BT_W4_EVENT_HDR; |
| 330 | st_gdata->rx_count = HCI_EVENT_HDR_SIZE; |
| 331 | type = HCI_EVENT_PKT; |
| 332 | protoid = ST_BT; |
| 333 | break; |
| 334 | |
| 335 | /* Bluetooth acl packet? */ |
| 336 | case HCI_ACLDATA_PKT: |
| 337 | pr_info("ACL packet"); |
| 338 | st_gdata->rx_state = ST_BT_W4_ACL_HDR; |
| 339 | st_gdata->rx_count = HCI_ACL_HDR_SIZE; |
| 340 | type = HCI_ACLDATA_PKT; |
| 341 | protoid = ST_BT; |
| 342 | break; |
| 343 | |
| 344 | /* Bluetooth sco packet? */ |
| 345 | case HCI_SCODATA_PKT: |
| 346 | pr_info("SCO packet"); |
| 347 | st_gdata->rx_state = ST_BT_W4_SCO_HDR; |
| 348 | st_gdata->rx_count = HCI_SCO_HDR_SIZE; |
| 349 | type = HCI_SCODATA_PKT; |
| 350 | protoid = ST_BT; |
| 351 | break; |
| 352 | |
| 353 | /* Channel 8(FM) packet? */ |
| 354 | case ST_FM_CH8_PKT: |
| 355 | pr_info("FM CH8 packet"); |
| 356 | type = ST_FM_CH8_PKT; |
| 357 | st_gdata->rx_state = ST_FM_W4_EVENT_HDR; |
| 358 | st_gdata->rx_count = FM_EVENT_HDR_SIZE; |
| 359 | protoid = ST_FM; |
| 360 | break; |
| 361 | |
| 362 | /* Channel 9(GPS) packet? */ |
| 363 | case 0x9: /*ST_LL_GPS_CH9_PKT */ |
| 364 | pr_info("GPS CH9 packet"); |
| 365 | type = 0x9; /* ST_LL_GPS_CH9_PKT; */ |
| 366 | protoid = ST_GPS; |
| 367 | st_gdata->rx_state = ST_GPS_W4_EVENT_HDR; |
| 368 | st_gdata->rx_count = 3; /* GPS_EVENT_HDR_SIZE -1*/ |
| 369 | break; |
| 370 | case LL_SLEEP_IND: |
| 371 | case LL_SLEEP_ACK: |
| 372 | case LL_WAKE_UP_IND: |
| 373 | pr_info("PM packet"); |
| 374 | /* this takes appropriate action based on |
| 375 | * sleep state received -- |
| 376 | */ |
| 377 | st_ll_sleep_state(st_gdata, *ptr); |
| 378 | ptr++; |
| 379 | count--; |
| 380 | continue; |
| 381 | case LL_WAKE_UP_ACK: |
| 382 | pr_info("PM packet"); |
| 383 | /* wake up ack received */ |
| 384 | st_wakeup_ack(st_gdata, *ptr); |
| 385 | ptr++; |
| 386 | count--; |
| 387 | continue; |
| 388 | /* Unknow packet? */ |
| 389 | default: |
| 390 | pr_err("Unknown packet type %2.2x", (__u8) *ptr); |
| 391 | ptr++; |
| 392 | count--; |
| 393 | continue; |
| 394 | }; |
| 395 | ptr++; |
| 396 | count--; |
| 397 | |
| 398 | switch (protoid) { |
| 399 | case ST_BT: |
| 400 | /* Allocate new packet to hold received data */ |
| 401 | st_gdata->rx_skb = |
| 402 | bt_skb_alloc(HCI_MAX_FRAME_SIZE, GFP_ATOMIC); |
| 403 | if (!st_gdata->rx_skb) { |
| 404 | pr_err("Can't allocate mem for new packet"); |
| 405 | st_gdata->rx_state = ST_W4_PACKET_TYPE; |
| 406 | st_gdata->rx_count = 0; |
| 407 | return; |
| 408 | } |
| 409 | bt_cb(st_gdata->rx_skb)->pkt_type = type; |
| 410 | break; |
| 411 | case ST_FM: /* for FM */ |
| 412 | st_gdata->rx_skb = |
| 413 | alloc_skb(FM_MAX_FRAME_SIZE, GFP_ATOMIC); |
| 414 | if (!st_gdata->rx_skb) { |
| 415 | pr_err("Can't allocate mem for new packet"); |
| 416 | st_gdata->rx_state = ST_W4_PACKET_TYPE; |
| 417 | st_gdata->rx_count = 0; |
| 418 | return; |
| 419 | } |
| 420 | /* place holder 0x08 */ |
| 421 | skb_reserve(st_gdata->rx_skb, 1); |
| 422 | st_gdata->rx_skb->cb[0] = ST_FM_CH8_PKT; |
| 423 | break; |
| 424 | case ST_GPS: |
| 425 | /* for GPS */ |
| 426 | st_gdata->rx_skb = |
| 427 | alloc_skb(100 /*GPS_MAX_FRAME_SIZE */ , GFP_ATOMIC); |
| 428 | if (!st_gdata->rx_skb) { |
| 429 | pr_err("Can't allocate mem for new packet"); |
| 430 | st_gdata->rx_state = ST_W4_PACKET_TYPE; |
| 431 | st_gdata->rx_count = 0; |
| 432 | return; |
| 433 | } |
| 434 | /* place holder 0x09 */ |
| 435 | skb_reserve(st_gdata->rx_skb, 1); |
| 436 | st_gdata->rx_skb->cb[0] = 0x09; /*ST_GPS_CH9_PKT; */ |
| 437 | break; |
| 438 | case ST_MAX: |
| 439 | break; |
| 440 | } |
| 441 | } |
| 442 | pr_info("done %s", __func__); |
| 443 | return; |
| 444 | } |
| 445 | |
| 446 | /* internal de-Q function |
| 447 | * -- return previous in-completely written skb |
| 448 | * or return the skb in the txQ |
| 449 | */ |
| 450 | struct sk_buff *st_int_dequeue(struct st_data_s *st_gdata) |
| 451 | { |
| 452 | struct sk_buff *returning_skb; |
| 453 | |
| 454 | pr_info("%s", __func__); |
| 455 | /* if the previous skb wasn't written completely |
| 456 | */ |
| 457 | if (st_gdata->tx_skb != NULL) { |
| 458 | returning_skb = st_gdata->tx_skb; |
| 459 | st_gdata->tx_skb = NULL; |
| 460 | return returning_skb; |
| 461 | } |
| 462 | |
| 463 | /* de-Q from the txQ always if previous write is complete */ |
| 464 | return skb_dequeue(&st_gdata->txq); |
| 465 | } |
| 466 | |
| 467 | /* internal Q-ing function |
| 468 | * will either Q the skb to txq or the tx_waitq |
| 469 | * depending on the ST LL state |
| 470 | * |
| 471 | * lock the whole func - since ll_getstate and Q-ing should happen |
| 472 | * in one-shot |
| 473 | */ |
| 474 | void st_int_enqueue(struct st_data_s *st_gdata, struct sk_buff *skb) |
| 475 | { |
| 476 | unsigned long flags = 0; |
| 477 | |
| 478 | pr_info("%s", __func__); |
| 479 | /* this function can be invoked in more then one context. |
| 480 | * so have a lock */ |
| 481 | spin_lock_irqsave(&st_gdata->lock, flags); |
| 482 | |
| 483 | switch (st_ll_getstate(st_gdata)) { |
| 484 | case ST_LL_AWAKE: |
| 485 | pr_info("ST LL is AWAKE, sending normally"); |
| 486 | skb_queue_tail(&st_gdata->txq, skb); |
| 487 | break; |
| 488 | case ST_LL_ASLEEP_TO_AWAKE: |
| 489 | skb_queue_tail(&st_gdata->tx_waitq, skb); |
| 490 | break; |
| 491 | case ST_LL_AWAKE_TO_ASLEEP: /* host cannot be in this state */ |
| 492 | pr_err("ST LL is illegal state(%ld)," |
| 493 | "purging received skb.", st_ll_getstate(st_gdata)); |
| 494 | kfree_skb(skb); |
| 495 | break; |
| 496 | |
| 497 | case ST_LL_ASLEEP: |
| 498 | /* call a function of ST LL to put data |
| 499 | * in tx_waitQ and wake_ind in txQ |
| 500 | */ |
| 501 | skb_queue_tail(&st_gdata->tx_waitq, skb); |
| 502 | st_ll_wakeup(st_gdata); |
| 503 | break; |
| 504 | default: |
| 505 | pr_err("ST LL is illegal state(%ld)," |
| 506 | "purging received skb.", st_ll_getstate(st_gdata)); |
| 507 | kfree_skb(skb); |
| 508 | break; |
| 509 | } |
| 510 | spin_unlock_irqrestore(&st_gdata->lock, flags); |
| 511 | pr_info("done %s", __func__); |
| 512 | return; |
| 513 | } |
| 514 | |
| 515 | /* |
| 516 | * internal wakeup function |
| 517 | * called from either |
| 518 | * - TTY layer when write's finished |
| 519 | * - st_write (in context of the protocol stack) |
| 520 | */ |
| 521 | void st_tx_wakeup(struct st_data_s *st_data) |
| 522 | { |
| 523 | struct sk_buff *skb; |
| 524 | unsigned long flags; /* for irq save flags */ |
| 525 | pr_info("%s", __func__); |
| 526 | /* check for sending & set flag sending here */ |
| 527 | if (test_and_set_bit(ST_TX_SENDING, &st_data->tx_state)) { |
| 528 | pr_info("ST already sending"); |
| 529 | /* keep sending */ |
| 530 | set_bit(ST_TX_WAKEUP, &st_data->tx_state); |
| 531 | return; |
| 532 | /* TX_WAKEUP will be checked in another |
| 533 | * context |
| 534 | */ |
| 535 | } |
| 536 | do { /* come back if st_tx_wakeup is set */ |
| 537 | /* woke-up to write */ |
| 538 | clear_bit(ST_TX_WAKEUP, &st_data->tx_state); |
| 539 | while ((skb = st_int_dequeue(st_data))) { |
| 540 | int len; |
| 541 | spin_lock_irqsave(&st_data->lock, flags); |
| 542 | /* enable wake-up from TTY */ |
| 543 | set_bit(TTY_DO_WRITE_WAKEUP, &st_data->tty->flags); |
| 544 | len = st_int_write(st_data, skb->data, skb->len); |
| 545 | skb_pull(skb, len); |
| 546 | /* if skb->len = len as expected, skb->len=0 */ |
| 547 | if (skb->len) { |
| 548 | /* would be the next skb to be sent */ |
| 549 | st_data->tx_skb = skb; |
| 550 | spin_unlock_irqrestore(&st_data->lock, flags); |
| 551 | break; |
| 552 | } |
| 553 | kfree_skb(skb); |
| 554 | spin_unlock_irqrestore(&st_data->lock, flags); |
| 555 | } |
| 556 | /* if wake-up is set in another context- restart sending */ |
| 557 | } while (test_bit(ST_TX_WAKEUP, &st_data->tx_state)); |
| 558 | |
| 559 | /* clear flag sending */ |
| 560 | clear_bit(ST_TX_SENDING, &st_data->tx_state); |
| 561 | } |
| 562 | |
| 563 | /********************************************************************/ |
| 564 | /* functions called from ST KIM |
| 565 | */ |
| 566 | void kim_st_list_protocols(struct st_data_s *st_gdata, char *buf) |
| 567 | { |
| 568 | unsigned long flags = 0; |
| 569 | #ifdef DEBUG |
| 570 | unsigned char i = ST_MAX; |
| 571 | #endif |
| 572 | spin_lock_irqsave(&st_gdata->lock, flags); |
| 573 | #ifdef DEBUG /* more detailed log */ |
| 574 | for (i = 0; i < ST_MAX; i++) { |
| 575 | if (i == 0) { |
| 576 | sprintf(buf, "%s is %s", protocol_strngs[i], |
| 577 | st_gdata->list[i] != |
| 578 | NULL ? "Registered" : "Unregistered"); |
| 579 | } else { |
| 580 | sprintf(buf, "%s\n%s is %s", buf, protocol_strngs[i], |
| 581 | st_gdata->list[i] != |
| 582 | NULL ? "Registered" : "Unregistered"); |
| 583 | } |
| 584 | } |
| 585 | sprintf(buf, "%s\n", buf); |
| 586 | #else /* limited info */ |
| 587 | sprintf(buf, "BT=%c\nFM=%c\nGPS=%c\n", |
| 588 | st_gdata->list[ST_BT] != NULL ? 'R' : 'U', |
| 589 | st_gdata->list[ST_FM] != NULL ? 'R' : 'U', |
| 590 | st_gdata->list[ST_GPS] != NULL ? 'R' : 'U'); |
| 591 | #endif |
| 592 | spin_unlock_irqrestore(&st_gdata->lock, flags); |
| 593 | } |
| 594 | |
| 595 | /********************************************************************/ |
| 596 | /* |
| 597 | * functions called from protocol stack drivers |
| 598 | * to be EXPORT-ed |
| 599 | */ |
| 600 | long st_register(struct st_proto_s *new_proto) |
| 601 | { |
| 602 | struct st_data_s *st_gdata; |
| 603 | long err = ST_SUCCESS; |
| 604 | unsigned long flags = 0; |
| 605 | |
| 606 | st_kim_ref(&st_gdata); |
| 607 | pr_info("%s(%d) ", __func__, new_proto->type); |
| 608 | if (st_gdata == NULL || new_proto == NULL || new_proto->recv == NULL |
| 609 | || new_proto->reg_complete_cb == NULL) { |
| 610 | pr_err("gdata/new_proto/recv or reg_complete_cb not ready"); |
| 611 | return ST_ERR_FAILURE; |
| 612 | } |
| 613 | |
| 614 | if (new_proto->type < ST_BT || new_proto->type >= ST_MAX) { |
| 615 | pr_err("protocol %d not supported", new_proto->type); |
| 616 | return ST_ERR_NOPROTO; |
| 617 | } |
| 618 | |
| 619 | if (st_gdata->list[new_proto->type] != NULL) { |
| 620 | pr_err("protocol %d already registered", new_proto->type); |
| 621 | return ST_ERR_ALREADY; |
| 622 | } |
| 623 | |
| 624 | /* can be from process context only */ |
| 625 | spin_lock_irqsave(&st_gdata->lock, flags); |
| 626 | |
| 627 | if (test_bit(ST_REG_IN_PROGRESS, &st_gdata->st_state)) { |
| 628 | pr_info(" ST_REG_IN_PROGRESS:%d ", new_proto->type); |
| 629 | /* fw download in progress */ |
| 630 | st_kim_chip_toggle(new_proto->type, KIM_GPIO_ACTIVE); |
| 631 | |
| 632 | st_gdata->list[new_proto->type] = new_proto; |
| 633 | new_proto->write = st_write; |
| 634 | |
| 635 | set_bit(ST_REG_PENDING, &st_gdata->st_state); |
| 636 | spin_unlock_irqrestore(&st_gdata->lock, flags); |
| 637 | return ST_ERR_PENDING; |
| 638 | } else if (st_gdata->protos_registered == ST_EMPTY) { |
| 639 | pr_info(" protocol list empty :%d ", new_proto->type); |
| 640 | set_bit(ST_REG_IN_PROGRESS, &st_gdata->st_state); |
| 641 | st_recv = st_kim_recv; |
| 642 | |
| 643 | /* release lock previously held - re-locked below */ |
| 644 | spin_unlock_irqrestore(&st_gdata->lock, flags); |
| 645 | |
| 646 | /* enable the ST LL - to set default chip state */ |
| 647 | st_ll_enable(st_gdata); |
| 648 | /* this may take a while to complete |
| 649 | * since it involves BT fw download |
| 650 | */ |
| 651 | err = st_kim_start(); |
| 652 | if (err != ST_SUCCESS) { |
| 653 | clear_bit(ST_REG_IN_PROGRESS, &st_gdata->st_state); |
| 654 | if ((st_gdata->protos_registered != ST_EMPTY) && |
| 655 | (test_bit(ST_REG_PENDING, &st_gdata->st_state))) { |
| 656 | pr_err(" KIM failure complete callback "); |
| 657 | st_reg_complete(st_gdata, ST_ERR_FAILURE); |
| 658 | } |
| 659 | |
| 660 | return ST_ERR_FAILURE; |
| 661 | } |
| 662 | |
| 663 | /* the protocol might require other gpios to be toggled |
| 664 | */ |
| 665 | st_kim_chip_toggle(new_proto->type, KIM_GPIO_ACTIVE); |
| 666 | |
| 667 | clear_bit(ST_REG_IN_PROGRESS, &st_gdata->st_state); |
| 668 | st_recv = st_int_recv; |
| 669 | |
| 670 | /* this is where all pending registration |
| 671 | * are signalled to be complete by calling callback functions |
| 672 | */ |
| 673 | if ((st_gdata->protos_registered != ST_EMPTY) && |
| 674 | (test_bit(ST_REG_PENDING, &st_gdata->st_state))) { |
| 675 | pr_info(" call reg complete callback "); |
| 676 | st_gdata->protos_registered++; |
| 677 | st_reg_complete(st_gdata, ST_SUCCESS); |
| 678 | } |
| 679 | clear_bit(ST_REG_PENDING, &st_gdata->st_state); |
| 680 | |
| 681 | /* check for already registered once more, |
| 682 | * since the above check is old |
| 683 | */ |
| 684 | if (st_gdata->list[new_proto->type] != NULL) { |
| 685 | pr_err(" proto %d already registered ", |
| 686 | new_proto->type); |
| 687 | return ST_ERR_ALREADY; |
| 688 | } |
| 689 | |
| 690 | spin_lock_irqsave(&st_gdata->lock, flags); |
| 691 | st_gdata->list[new_proto->type] = new_proto; |
| 692 | new_proto->write = st_write; |
| 693 | spin_unlock_irqrestore(&st_gdata->lock, flags); |
| 694 | return err; |
| 695 | } |
| 696 | /* if fw is already downloaded & new stack registers protocol */ |
| 697 | else { |
| 698 | switch (new_proto->type) { |
| 699 | case ST_BT: |
| 700 | /* do nothing */ |
| 701 | break; |
| 702 | case ST_FM: |
| 703 | case ST_GPS: |
| 704 | st_kim_chip_toggle(new_proto->type, KIM_GPIO_ACTIVE); |
| 705 | break; |
| 706 | case ST_MAX: |
| 707 | default: |
| 708 | pr_err("%d protocol not supported", |
| 709 | new_proto->type); |
| 710 | err = ST_ERR_NOPROTO; |
| 711 | /* something wrong */ |
| 712 | break; |
| 713 | } |
| 714 | st_gdata->list[new_proto->type] = new_proto; |
| 715 | new_proto->write = st_write; |
| 716 | |
| 717 | /* lock already held before entering else */ |
| 718 | spin_unlock_irqrestore(&st_gdata->lock, flags); |
| 719 | return err; |
| 720 | } |
| 721 | pr_info("done %s(%d) ", __func__, new_proto->type); |
| 722 | } |
| 723 | EXPORT_SYMBOL_GPL(st_register); |
| 724 | |
| 725 | /* to unregister a protocol - |
| 726 | * to be called from protocol stack driver |
| 727 | */ |
| 728 | long st_unregister(enum proto_type type) |
| 729 | { |
| 730 | long err = ST_SUCCESS; |
| 731 | unsigned long flags = 0; |
| 732 | struct st_data_s *st_gdata; |
| 733 | |
| 734 | pr_info("%s: %d ", __func__, type); |
| 735 | |
| 736 | st_kim_ref(&st_gdata); |
| 737 | if (type < ST_BT || type >= ST_MAX) { |
| 738 | pr_err(" protocol %d not supported", type); |
| 739 | return ST_ERR_NOPROTO; |
| 740 | } |
| 741 | |
| 742 | spin_lock_irqsave(&st_gdata->lock, flags); |
| 743 | |
| 744 | if (st_gdata->list[type] == NULL) { |
| 745 | pr_err(" protocol %d not registered", type); |
| 746 | spin_unlock_irqrestore(&st_gdata->lock, flags); |
| 747 | return ST_ERR_NOPROTO; |
| 748 | } |
| 749 | |
| 750 | st_gdata->protos_registered--; |
| 751 | st_gdata->list[type] = NULL; |
| 752 | |
| 753 | /* kim ignores BT in the below function |
| 754 | * and handles the rest, BT is toggled |
| 755 | * only in kim_start and kim_stop |
| 756 | */ |
| 757 | st_kim_chip_toggle(type, KIM_GPIO_INACTIVE); |
| 758 | spin_unlock_irqrestore(&st_gdata->lock, flags); |
| 759 | |
| 760 | if ((st_gdata->protos_registered == ST_EMPTY) && |
| 761 | (!test_bit(ST_REG_PENDING, &st_gdata->st_state))) { |
| 762 | pr_info(" all protocols unregistered "); |
| 763 | |
| 764 | /* stop traffic on tty */ |
| 765 | if (st_gdata->tty) { |
| 766 | tty_ldisc_flush(st_gdata->tty); |
| 767 | stop_tty(st_gdata->tty); |
| 768 | } |
| 769 | |
| 770 | /* all protocols now unregistered */ |
| 771 | st_kim_stop(); |
| 772 | /* disable ST LL */ |
| 773 | st_ll_disable(st_gdata); |
| 774 | } |
| 775 | return err; |
| 776 | } |
| 777 | |
| 778 | /* |
| 779 | * called in protocol stack drivers |
| 780 | * via the write function pointer |
| 781 | */ |
| 782 | long st_write(struct sk_buff *skb) |
| 783 | { |
| 784 | struct st_data_s *st_gdata; |
| 785 | #ifdef DEBUG |
| 786 | enum proto_type protoid = ST_MAX; |
| 787 | #endif |
| 788 | long len; |
| 789 | |
| 790 | st_kim_ref(&st_gdata); |
| 791 | if (unlikely(skb == NULL || st_gdata == NULL |
| 792 | || st_gdata->tty == NULL)) { |
| 793 | pr_err("data/tty unavailable to perform write"); |
| 794 | return ST_ERR_FAILURE; |
| 795 | } |
| 796 | #ifdef DEBUG /* open-up skb to read the 1st byte */ |
| 797 | switch (skb->data[0]) { |
| 798 | case HCI_COMMAND_PKT: |
| 799 | case HCI_ACLDATA_PKT: |
| 800 | case HCI_SCODATA_PKT: |
| 801 | protoid = ST_BT; |
| 802 | break; |
| 803 | case ST_FM_CH8_PKT: |
| 804 | protoid = ST_FM; |
| 805 | break; |
| 806 | case 0x09: |
| 807 | protoid = ST_GPS; |
| 808 | break; |
| 809 | } |
| 810 | if (unlikely(st_gdata->list[protoid] == NULL)) { |
| 811 | pr_err(" protocol %d not registered, and writing? ", |
| 812 | protoid); |
| 813 | return ST_ERR_FAILURE; |
| 814 | } |
| 815 | #endif |
| 816 | pr_info("%d to be written", skb->len); |
| 817 | len = skb->len; |
| 818 | |
| 819 | /* st_ll to decide where to enqueue the skb */ |
| 820 | st_int_enqueue(st_gdata, skb); |
| 821 | /* wake up */ |
| 822 | st_tx_wakeup(st_gdata); |
| 823 | |
| 824 | /* return number of bytes written */ |
| 825 | return len; |
| 826 | } |
| 827 | |
| 828 | /* for protocols making use of shared transport */ |
| 829 | EXPORT_SYMBOL_GPL(st_unregister); |
| 830 | |
| 831 | /********************************************************************/ |
| 832 | /* |
| 833 | * functions called from TTY layer |
| 834 | */ |
| 835 | static int st_tty_open(struct tty_struct *tty) |
| 836 | { |
| 837 | int err = ST_SUCCESS; |
| 838 | struct st_data_s *st_gdata; |
| 839 | pr_info("%s ", __func__); |
| 840 | |
| 841 | st_kim_ref(&st_gdata); |
| 842 | st_gdata->tty = tty; |
| 843 | tty->disc_data = st_gdata; |
| 844 | |
| 845 | /* don't do an wakeup for now */ |
| 846 | clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags); |
| 847 | |
| 848 | /* mem already allocated |
| 849 | */ |
| 850 | tty->receive_room = 65536; |
| 851 | /* Flush any pending characters in the driver and discipline. */ |
| 852 | tty_ldisc_flush(tty); |
| 853 | tty_driver_flush_buffer(tty); |
| 854 | /* |
| 855 | * signal to UIM via KIM that - |
| 856 | * installation of N_TI_WL ldisc is complete |
| 857 | */ |
| 858 | st_kim_complete(); |
| 859 | pr_info("done %s", __func__); |
| 860 | return err; |
| 861 | } |
| 862 | |
| 863 | static void st_tty_close(struct tty_struct *tty) |
| 864 | { |
| 865 | unsigned char i = ST_MAX; |
| 866 | unsigned long flags = 0; |
| 867 | struct st_data_s *st_gdata = tty->disc_data; |
| 868 | |
| 869 | pr_info("%s ", __func__); |
| 870 | |
| 871 | /* TODO: |
| 872 | * if a protocol has been registered & line discipline |
| 873 | * un-installed for some reason - what should be done ? |
| 874 | */ |
| 875 | spin_lock_irqsave(&st_gdata->lock, flags); |
| 876 | for (i = ST_BT; i < ST_MAX; i++) { |
| 877 | if (st_gdata->list[i] != NULL) |
| 878 | pr_err("%d not un-registered", i); |
| 879 | st_gdata->list[i] = NULL; |
| 880 | } |
| 881 | spin_unlock_irqrestore(&st_gdata->lock, flags); |
| 882 | /* |
| 883 | * signal to UIM via KIM that - |
| 884 | * N_TI_WL ldisc is un-installed |
| 885 | */ |
| 886 | st_kim_complete(); |
| 887 | st_gdata->tty = NULL; |
| 888 | /* Flush any pending characters in the driver and discipline. */ |
| 889 | tty_ldisc_flush(tty); |
| 890 | tty_driver_flush_buffer(tty); |
| 891 | |
| 892 | spin_lock_irqsave(&st_gdata->lock, flags); |
| 893 | /* empty out txq and tx_waitq */ |
| 894 | skb_queue_purge(&st_gdata->txq); |
| 895 | skb_queue_purge(&st_gdata->tx_waitq); |
| 896 | /* reset the TTY Rx states of ST */ |
| 897 | st_gdata->rx_count = 0; |
| 898 | st_gdata->rx_state = ST_W4_PACKET_TYPE; |
| 899 | kfree_skb(st_gdata->rx_skb); |
| 900 | st_gdata->rx_skb = NULL; |
| 901 | spin_unlock_irqrestore(&st_gdata->lock, flags); |
| 902 | |
| 903 | pr_info("%s: done ", __func__); |
| 904 | } |
| 905 | |
| 906 | static void st_tty_receive(struct tty_struct *tty, const unsigned char *data, |
| 907 | char *tty_flags, int count) |
| 908 | { |
| 909 | |
| 910 | #ifdef VERBOSE |
| 911 | long i; |
| 912 | printk(KERN_ERR "incoming data...\n"); |
| 913 | for (i = 0; i < count; i++) |
| 914 | printk(" %x", data[i]); |
| 915 | printk(KERN_ERR "\n.. data end\n"); |
| 916 | #endif |
| 917 | |
| 918 | /* |
| 919 | * if fw download is in progress then route incoming data |
| 920 | * to KIM for validation |
| 921 | */ |
| 922 | st_recv(tty->disc_data, data, count); |
| 923 | pr_info("done %s", __func__); |
| 924 | } |
| 925 | |
| 926 | /* wake-up function called in from the TTY layer |
| 927 | * inside the internal wakeup function will be called |
| 928 | */ |
| 929 | static void st_tty_wakeup(struct tty_struct *tty) |
| 930 | { |
| 931 | struct st_data_s *st_gdata = tty->disc_data; |
| 932 | pr_info("%s ", __func__); |
| 933 | /* don't do an wakeup for now */ |
| 934 | clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags); |
| 935 | |
| 936 | /* call our internal wakeup */ |
| 937 | st_tx_wakeup((void *)st_gdata); |
| 938 | } |
| 939 | |
| 940 | static void st_tty_flush_buffer(struct tty_struct *tty) |
| 941 | { |
| 942 | struct st_data_s *st_gdata = tty->disc_data; |
| 943 | pr_info("%s ", __func__); |
| 944 | |
| 945 | kfree_skb(st_gdata->tx_skb); |
| 946 | st_gdata->tx_skb = NULL; |
| 947 | |
| 948 | tty->ops->flush_buffer(tty); |
| 949 | return; |
| 950 | } |
| 951 | |
| 952 | /********************************************************************/ |
| 953 | int st_core_init(struct st_data_s **core_data) |
| 954 | { |
| 955 | struct st_data_s *st_gdata; |
| 956 | long err; |
| 957 | static struct tty_ldisc_ops *st_ldisc_ops; |
| 958 | |
| 959 | /* populate and register to TTY line discipline */ |
| 960 | st_ldisc_ops = kzalloc(sizeof(*st_ldisc_ops), GFP_KERNEL); |
| 961 | if (!st_ldisc_ops) { |
| 962 | pr_err("no mem to allocate"); |
| 963 | return -ENOMEM; |
| 964 | } |
| 965 | |
| 966 | st_ldisc_ops->magic = TTY_LDISC_MAGIC; |
| 967 | st_ldisc_ops->name = "n_st"; /*"n_hci"; */ |
| 968 | st_ldisc_ops->open = st_tty_open; |
| 969 | st_ldisc_ops->close = st_tty_close; |
| 970 | st_ldisc_ops->receive_buf = st_tty_receive; |
| 971 | st_ldisc_ops->write_wakeup = st_tty_wakeup; |
| 972 | st_ldisc_ops->flush_buffer = st_tty_flush_buffer; |
| 973 | st_ldisc_ops->owner = THIS_MODULE; |
| 974 | |
| 975 | err = tty_register_ldisc(N_TI_WL, st_ldisc_ops); |
| 976 | if (err) { |
| 977 | pr_err("error registering %d line discipline %ld", |
| 978 | N_TI_WL, err); |
| 979 | kfree(st_ldisc_ops); |
| 980 | return err; |
| 981 | } |
| 982 | pr_info("registered n_shared line discipline"); |
| 983 | |
| 984 | st_gdata = kzalloc(sizeof(struct st_data_s), GFP_KERNEL); |
| 985 | if (!st_gdata) { |
| 986 | pr_err("memory allocation failed"); |
| 987 | err = tty_unregister_ldisc(N_TI_WL); |
| 988 | if (err) |
| 989 | pr_err("unable to un-register ldisc %ld", err); |
| 990 | kfree(st_ldisc_ops); |
| 991 | err = -ENOMEM; |
| 992 | return err; |
| 993 | } |
| 994 | |
| 995 | /* Initialize ST TxQ and Tx waitQ queue head. All BT/FM/GPS module skb's |
| 996 | * will be pushed in this queue for actual transmission. |
| 997 | */ |
| 998 | skb_queue_head_init(&st_gdata->txq); |
| 999 | skb_queue_head_init(&st_gdata->tx_waitq); |
| 1000 | |
| 1001 | /* Locking used in st_int_enqueue() to avoid multiple execution */ |
| 1002 | spin_lock_init(&st_gdata->lock); |
| 1003 | |
| 1004 | /* ldisc_ops ref to be only used in __exit of module */ |
| 1005 | st_gdata->ldisc_ops = st_ldisc_ops; |
| 1006 | |
| 1007 | #if 0 |
| 1008 | err = st_kim_init(); |
| 1009 | if (err) { |
| 1010 | pr_err("error during kim initialization(%ld)", err); |
| 1011 | kfree(st_gdata); |
| 1012 | err = tty_unregister_ldisc(N_TI_WL); |
| 1013 | if (err) |
| 1014 | pr_err("unable to un-register ldisc"); |
| 1015 | kfree(st_ldisc_ops); |
| 1016 | return -1; |
| 1017 | } |
| 1018 | #endif |
| 1019 | |
| 1020 | err = st_ll_init(st_gdata); |
| 1021 | if (err) { |
| 1022 | pr_err("error during st_ll initialization(%ld)", err); |
| 1023 | kfree(st_gdata); |
| 1024 | err = tty_unregister_ldisc(N_TI_WL); |
| 1025 | if (err) |
| 1026 | pr_err("unable to un-register ldisc"); |
| 1027 | kfree(st_ldisc_ops); |
| 1028 | return -1; |
| 1029 | } |
| 1030 | *core_data = st_gdata; |
| 1031 | return 0; |
| 1032 | } |
| 1033 | |
| 1034 | void st_core_exit(struct st_data_s *st_gdata) |
| 1035 | { |
| 1036 | long err; |
| 1037 | /* internal module cleanup */ |
| 1038 | err = st_ll_deinit(st_gdata); |
| 1039 | if (err) |
| 1040 | pr_err("error during deinit of ST LL %ld", err); |
| 1041 | #if 0 |
| 1042 | err = st_kim_deinit(); |
| 1043 | if (err) |
| 1044 | pr_err("error during deinit of ST KIM %ld", err); |
| 1045 | #endif |
| 1046 | if (st_gdata != NULL) { |
| 1047 | /* Free ST Tx Qs and skbs */ |
| 1048 | skb_queue_purge(&st_gdata->txq); |
| 1049 | skb_queue_purge(&st_gdata->tx_waitq); |
| 1050 | kfree_skb(st_gdata->rx_skb); |
| 1051 | kfree_skb(st_gdata->tx_skb); |
| 1052 | /* TTY ldisc cleanup */ |
| 1053 | err = tty_unregister_ldisc(N_TI_WL); |
| 1054 | if (err) |
| 1055 | pr_err("unable to un-register ldisc %ld", err); |
| 1056 | kfree(st_gdata->ldisc_ops); |
| 1057 | /* free the global data pointer */ |
| 1058 | kfree(st_gdata); |
| 1059 | } |
| 1060 | } |
| 1061 | |
| 1062 | |