1 /* 2 * dvb_ca.c: generic DVB functions for EN50221 CAM interfaces 3 * 4 * Copyright (C) 2004 Andrew de Quincey 5 * 6 * Parts of this file were based on sources as follows: 7 * 8 * Copyright (C) 2003 Ralph Metzler <rjkm@metzlerbros.de> 9 * 10 * based on code: 11 * 12 * Copyright (C) 1999-2002 Ralph Metzler 13 * & Marcus Metzler for convergence integrated media GmbH 14 * 15 * This program is free software; you can redistribute it and/or 16 * modify it under the terms of the GNU General Public License 17 * as published by the Free Software Foundation; either version 2 18 * of the License, or (at your option) any later version. 19 * 20 * This program is distributed in the hope that it will be useful, 21 * but WITHOUT ANY WARRANTY; without even the implied warranty of 22 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 23 * GNU General Public License for more details. 24 * 25 * You should have received a copy of the GNU General Public License 26 * along with this program; if not, write to the Free Software 27 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 28 * Or, point your browser to http://www.gnu.org/copyleft/gpl.html 29 */ 30 31 #include <linux/errno.h> 32 #include <linux/slab.h> 33 #include <linux/list.h> 34 #include <linux/module.h> 35 #include <linux/vmalloc.h> 36 #include <linux/delay.h> 37 #include <linux/spinlock.h> 38 #include <linux/sched.h> 39 #include <linux/kthread.h> 40 41 #include "dvb_ca_en50221.h" 42 #include "dvb_ringbuffer.h" 43 44 static int dvb_ca_en50221_debug; 45 46 module_param_named(cam_debug, dvb_ca_en50221_debug, int, 0644); 47 MODULE_PARM_DESC(cam_debug, "enable verbose debug messages"); 48 49 #define dprintk if (dvb_ca_en50221_debug) printk 50 51 #define INIT_TIMEOUT_SECS 10 52 53 #define HOST_LINK_BUF_SIZE 0x200 54 55 #define RX_BUFFER_SIZE 65535 56 57 #define MAX_RX_PACKETS_PER_ITERATION 10 58 59 #define CTRLIF_DATA 0 60 #define CTRLIF_COMMAND 1 61 #define CTRLIF_STATUS 1 62 #define CTRLIF_SIZE_LOW 2 63 #define CTRLIF_SIZE_HIGH 3 64 65 #define CMDREG_HC 1 /* Host control */ 66 #define CMDREG_SW 2 /* Size write */ 67 #define CMDREG_SR 4 /* Size read */ 68 #define CMDREG_RS 8 /* Reset interface */ 69 #define CMDREG_FRIE 0x40 /* Enable FR interrupt */ 70 #define CMDREG_DAIE 0x80 /* Enable DA interrupt */ 71 #define IRQEN (CMDREG_DAIE) 72 73 #define STATUSREG_RE 1 /* read error */ 74 #define STATUSREG_WE 2 /* write error */ 75 #define STATUSREG_FR 0x40 /* module free */ 76 #define STATUSREG_DA 0x80 /* data available */ 77 #define STATUSREG_TXERR (STATUSREG_RE|STATUSREG_WE) /* general transfer error */ 78 79 80 #define DVB_CA_SLOTSTATE_NONE 0 81 #define DVB_CA_SLOTSTATE_UNINITIALISED 1 82 #define DVB_CA_SLOTSTATE_RUNNING 2 83 #define DVB_CA_SLOTSTATE_INVALID 3 84 #define DVB_CA_SLOTSTATE_WAITREADY 4 85 #define DVB_CA_SLOTSTATE_VALIDATE 5 86 #define DVB_CA_SLOTSTATE_WAITFR 6 87 #define DVB_CA_SLOTSTATE_LINKINIT 7 88 89 90 /* Information on a CA slot */ 91 struct dvb_ca_slot { 92 93 /* current state of the CAM */ 94 int slot_state; 95 96 /* mutex used for serializing access to one CI slot */ 97 struct mutex slot_lock; 98 99 /* Number of CAMCHANGES that have occurred since last processing */ 100 atomic_t camchange_count; 101 102 /* Type of last CAMCHANGE */ 103 int camchange_type; 104 105 /* base address of CAM config */ 106 u32 config_base; 107 108 /* value to write into Config Control register */ 109 u8 config_option; 110 111 /* if 1, the CAM supports DA IRQs */ 112 u8 da_irq_supported:1; 113 114 /* size of the buffer to use when talking to the CAM */ 115 int link_buf_size; 116 117 /* buffer for incoming packets */ 118 struct dvb_ringbuffer rx_buffer; 119 120 /* timer used during various states of the slot */ 121 unsigned long timeout; 122 }; 123 124 /* Private CA-interface information */ 125 struct dvb_ca_private { 126 127 /* pointer back to the public data structure */ 128 struct dvb_ca_en50221 *pub; 129 130 /* the DVB device */ 131 struct dvb_device *dvbdev; 132 133 /* Flags describing the interface (DVB_CA_FLAG_*) */ 134 u32 flags; 135 136 /* number of slots supported by this CA interface */ 137 unsigned int slot_count; 138 139 /* information on each slot */ 140 struct dvb_ca_slot *slot_info; 141 142 /* wait queues for read() and write() operations */ 143 wait_queue_head_t wait_queue; 144 145 /* PID of the monitoring thread */ 146 struct task_struct *thread; 147 148 /* Flag indicating if the CA device is open */ 149 unsigned int open:1; 150 151 /* Flag indicating the thread should wake up now */ 152 unsigned int wakeup:1; 153 154 /* Delay the main thread should use */ 155 unsigned long delay; 156 157 /* Slot to start looking for data to read from in the next user-space read operation */ 158 int next_read_slot; 159 }; 160 161 static void dvb_ca_en50221_thread_wakeup(struct dvb_ca_private *ca); 162 static int dvb_ca_en50221_read_data(struct dvb_ca_private *ca, int slot, u8 * ebuf, int ecount); 163 static int dvb_ca_en50221_write_data(struct dvb_ca_private *ca, int slot, u8 * ebuf, int ecount); 164 165 166 /** 167 * Safely find needle in haystack. 168 * 169 * @param haystack Buffer to look in. 170 * @param hlen Number of bytes in haystack. 171 * @param needle Buffer to find. 172 * @param nlen Number of bytes in needle. 173 * @return Pointer into haystack needle was found at, or NULL if not found. 174 */ 175 static char *findstr(char * haystack, int hlen, char * needle, int nlen) 176 { 177 int i; 178 179 if (hlen < nlen) 180 return NULL; 181 182 for (i = 0; i <= hlen - nlen; i++) { 183 if (!strncmp(haystack + i, needle, nlen)) 184 return haystack + i; 185 } 186 187 return NULL; 188 } 189 190 191 192 /* ******************************************************************************** */ 193 /* EN50221 physical interface functions */ 194 195 196 /** 197 * Check CAM status. 198 */ 199 static int dvb_ca_en50221_check_camstatus(struct dvb_ca_private *ca, int slot) 200 { 201 int slot_status; 202 int cam_present_now; 203 int cam_changed; 204 205 /* IRQ mode */ 206 if (ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE) { 207 return (atomic_read(&ca->slot_info[slot].camchange_count) != 0); 208 } 209 210 /* poll mode */ 211 slot_status = ca->pub->poll_slot_status(ca->pub, slot, ca->open); 212 213 cam_present_now = (slot_status & DVB_CA_EN50221_POLL_CAM_PRESENT) ? 1 : 0; 214 cam_changed = (slot_status & DVB_CA_EN50221_POLL_CAM_CHANGED) ? 1 : 0; 215 if (!cam_changed) { 216 int cam_present_old = (ca->slot_info[slot].slot_state != DVB_CA_SLOTSTATE_NONE); 217 cam_changed = (cam_present_now != cam_present_old); 218 } 219 220 if (cam_changed) { 221 if (!cam_present_now) { 222 ca->slot_info[slot].camchange_type = DVB_CA_EN50221_CAMCHANGE_REMOVED; 223 } else { 224 ca->slot_info[slot].camchange_type = DVB_CA_EN50221_CAMCHANGE_INSERTED; 225 } 226 atomic_set(&ca->slot_info[slot].camchange_count, 1); 227 } else { 228 if ((ca->slot_info[slot].slot_state == DVB_CA_SLOTSTATE_WAITREADY) && 229 (slot_status & DVB_CA_EN50221_POLL_CAM_READY)) { 230 // move to validate state if reset is completed 231 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_VALIDATE; 232 } 233 } 234 235 return cam_changed; 236 } 237 238 239 /** 240 * Wait for flags to become set on the STATUS register on a CAM interface, 241 * checking for errors and timeout. 242 * 243 * @param ca CA instance. 244 * @param slot Slot on interface. 245 * @param waitfor Flags to wait for. 246 * @param timeout_ms Timeout in milliseconds. 247 * 248 * @return 0 on success, nonzero on error. 249 */ 250 static int dvb_ca_en50221_wait_if_status(struct dvb_ca_private *ca, int slot, 251 u8 waitfor, int timeout_hz) 252 { 253 unsigned long timeout; 254 unsigned long start; 255 256 dprintk("%s\n", __func__); 257 258 /* loop until timeout elapsed */ 259 start = jiffies; 260 timeout = jiffies + timeout_hz; 261 while (1) { 262 /* read the status and check for error */ 263 int res = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS); 264 if (res < 0) 265 return -EIO; 266 267 /* if we got the flags, it was successful! */ 268 if (res & waitfor) { 269 dprintk("%s succeeded timeout:%lu\n", __func__, jiffies - start); 270 return 0; 271 } 272 273 /* check for timeout */ 274 if (time_after(jiffies, timeout)) { 275 break; 276 } 277 278 /* wait for a bit */ 279 msleep(1); 280 } 281 282 dprintk("%s failed timeout:%lu\n", __func__, jiffies - start); 283 284 /* if we get here, we've timed out */ 285 return -ETIMEDOUT; 286 } 287 288 289 /** 290 * Initialise the link layer connection to a CAM. 291 * 292 * @param ca CA instance. 293 * @param slot Slot id. 294 * 295 * @return 0 on success, nonzero on failure. 296 */ 297 static int dvb_ca_en50221_link_init(struct dvb_ca_private *ca, int slot) 298 { 299 int ret; 300 int buf_size; 301 u8 buf[2]; 302 303 dprintk("%s\n", __func__); 304 305 /* we'll be determining these during this function */ 306 ca->slot_info[slot].da_irq_supported = 0; 307 308 /* set the host link buffer size temporarily. it will be overwritten with the 309 * real negotiated size later. */ 310 ca->slot_info[slot].link_buf_size = 2; 311 312 /* read the buffer size from the CAM */ 313 if ((ret = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, IRQEN | CMDREG_SR)) != 0) 314 return ret; 315 if ((ret = dvb_ca_en50221_wait_if_status(ca, slot, STATUSREG_DA, HZ / 10)) != 0) 316 return ret; 317 if ((ret = dvb_ca_en50221_read_data(ca, slot, buf, 2)) != 2) 318 return -EIO; 319 if ((ret = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, IRQEN)) != 0) 320 return ret; 321 322 /* store it, and choose the minimum of our buffer and the CAM's buffer size */ 323 buf_size = (buf[0] << 8) | buf[1]; 324 if (buf_size > HOST_LINK_BUF_SIZE) 325 buf_size = HOST_LINK_BUF_SIZE; 326 ca->slot_info[slot].link_buf_size = buf_size; 327 buf[0] = buf_size >> 8; 328 buf[1] = buf_size & 0xff; 329 dprintk("Chosen link buffer size of %i\n", buf_size); 330 331 /* write the buffer size to the CAM */ 332 if ((ret = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, IRQEN | CMDREG_SW)) != 0) 333 return ret; 334 if ((ret = dvb_ca_en50221_wait_if_status(ca, slot, STATUSREG_FR, HZ / 10)) != 0) 335 return ret; 336 if ((ret = dvb_ca_en50221_write_data(ca, slot, buf, 2)) != 2) 337 return -EIO; 338 if ((ret = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, IRQEN)) != 0) 339 return ret; 340 341 /* success */ 342 return 0; 343 } 344 345 /** 346 * Read a tuple from attribute memory. 347 * 348 * @param ca CA instance. 349 * @param slot Slot id. 350 * @param address Address to read from. Updated. 351 * @param tupleType Tuple id byte. Updated. 352 * @param tupleLength Tuple length. Updated. 353 * @param tuple Dest buffer for tuple (must be 256 bytes). Updated. 354 * 355 * @return 0 on success, nonzero on error. 356 */ 357 static int dvb_ca_en50221_read_tuple(struct dvb_ca_private *ca, int slot, 358 int *address, int *tupleType, int *tupleLength, u8 * tuple) 359 { 360 int i; 361 int _tupleType; 362 int _tupleLength; 363 int _address = *address; 364 365 /* grab the next tuple length and type */ 366 if ((_tupleType = ca->pub->read_attribute_mem(ca->pub, slot, _address)) < 0) 367 return _tupleType; 368 if (_tupleType == 0xff) { 369 dprintk("END OF CHAIN TUPLE type:0x%x\n", _tupleType); 370 *address += 2; 371 *tupleType = _tupleType; 372 *tupleLength = 0; 373 return 0; 374 } 375 if ((_tupleLength = ca->pub->read_attribute_mem(ca->pub, slot, _address + 2)) < 0) 376 return _tupleLength; 377 _address += 4; 378 379 dprintk("TUPLE type:0x%x length:%i\n", _tupleType, _tupleLength); 380 381 /* read in the whole tuple */ 382 for (i = 0; i < _tupleLength; i++) { 383 tuple[i] = ca->pub->read_attribute_mem(ca->pub, slot, _address + (i * 2)); 384 dprintk(" 0x%02x: 0x%02x %c\n", 385 i, tuple[i] & 0xff, 386 ((tuple[i] > 31) && (tuple[i] < 127)) ? tuple[i] : '.'); 387 } 388 _address += (_tupleLength * 2); 389 390 // success 391 *tupleType = _tupleType; 392 *tupleLength = _tupleLength; 393 *address = _address; 394 return 0; 395 } 396 397 398 /** 399 * Parse attribute memory of a CAM module, extracting Config register, and checking 400 * it is a DVB CAM module. 401 * 402 * @param ca CA instance. 403 * @param slot Slot id. 404 * 405 * @return 0 on success, <0 on failure. 406 */ 407 static int dvb_ca_en50221_parse_attributes(struct dvb_ca_private *ca, int slot) 408 { 409 int address = 0; 410 int tupleLength; 411 int tupleType; 412 u8 tuple[257]; 413 char *dvb_str; 414 int rasz; 415 int status; 416 int got_cftableentry = 0; 417 int end_chain = 0; 418 int i; 419 u16 manfid = 0; 420 u16 devid = 0; 421 422 423 // CISTPL_DEVICE_0A 424 if ((status = 425 dvb_ca_en50221_read_tuple(ca, slot, &address, &tupleType, &tupleLength, tuple)) < 0) 426 return status; 427 if (tupleType != 0x1D) 428 return -EINVAL; 429 430 431 432 // CISTPL_DEVICE_0C 433 if ((status = 434 dvb_ca_en50221_read_tuple(ca, slot, &address, &tupleType, &tupleLength, tuple)) < 0) 435 return status; 436 if (tupleType != 0x1C) 437 return -EINVAL; 438 439 440 441 // CISTPL_VERS_1 442 if ((status = 443 dvb_ca_en50221_read_tuple(ca, slot, &address, &tupleType, &tupleLength, tuple)) < 0) 444 return status; 445 if (tupleType != 0x15) 446 return -EINVAL; 447 448 449 450 // CISTPL_MANFID 451 if ((status = dvb_ca_en50221_read_tuple(ca, slot, &address, &tupleType, 452 &tupleLength, tuple)) < 0) 453 return status; 454 if (tupleType != 0x20) 455 return -EINVAL; 456 if (tupleLength != 4) 457 return -EINVAL; 458 manfid = (tuple[1] << 8) | tuple[0]; 459 devid = (tuple[3] << 8) | tuple[2]; 460 461 462 463 // CISTPL_CONFIG 464 if ((status = dvb_ca_en50221_read_tuple(ca, slot, &address, &tupleType, 465 &tupleLength, tuple)) < 0) 466 return status; 467 if (tupleType != 0x1A) 468 return -EINVAL; 469 if (tupleLength < 3) 470 return -EINVAL; 471 472 /* extract the configbase */ 473 rasz = tuple[0] & 3; 474 if (tupleLength < (3 + rasz + 14)) 475 return -EINVAL; 476 ca->slot_info[slot].config_base = 0; 477 for (i = 0; i < rasz + 1; i++) { 478 ca->slot_info[slot].config_base |= (tuple[2 + i] << (8 * i)); 479 } 480 481 /* check it contains the correct DVB string */ 482 dvb_str = findstr((char *)tuple, tupleLength, "DVB_CI_V", 8); 483 if (dvb_str == NULL) 484 return -EINVAL; 485 if (tupleLength < ((dvb_str - (char *) tuple) + 12)) 486 return -EINVAL; 487 488 /* is it a version we support? */ 489 if (strncmp(dvb_str + 8, "1.00", 4)) { 490 printk("dvb_ca adapter %d: Unsupported DVB CAM module version %c%c%c%c\n", 491 ca->dvbdev->adapter->num, dvb_str[8], dvb_str[9], dvb_str[10], dvb_str[11]); 492 return -EINVAL; 493 } 494 495 /* process the CFTABLE_ENTRY tuples, and any after those */ 496 while ((!end_chain) && (address < 0x1000)) { 497 if ((status = dvb_ca_en50221_read_tuple(ca, slot, &address, &tupleType, 498 &tupleLength, tuple)) < 0) 499 return status; 500 switch (tupleType) { 501 case 0x1B: // CISTPL_CFTABLE_ENTRY 502 if (tupleLength < (2 + 11 + 17)) 503 break; 504 505 /* if we've already parsed one, just use it */ 506 if (got_cftableentry) 507 break; 508 509 /* get the config option */ 510 ca->slot_info[slot].config_option = tuple[0] & 0x3f; 511 512 /* OK, check it contains the correct strings */ 513 if ((findstr((char *)tuple, tupleLength, "DVB_HOST", 8) == NULL) || 514 (findstr((char *)tuple, tupleLength, "DVB_CI_MODULE", 13) == NULL)) 515 break; 516 517 got_cftableentry = 1; 518 break; 519 520 case 0x14: // CISTPL_NO_LINK 521 break; 522 523 case 0xFF: // CISTPL_END 524 end_chain = 1; 525 break; 526 527 default: /* Unknown tuple type - just skip this tuple and move to the next one */ 528 dprintk("dvb_ca: Skipping unknown tuple type:0x%x length:0x%x\n", tupleType, 529 tupleLength); 530 break; 531 } 532 } 533 534 if ((address > 0x1000) || (!got_cftableentry)) 535 return -EINVAL; 536 537 dprintk("Valid DVB CAM detected MANID:%x DEVID:%x CONFIGBASE:0x%x CONFIGOPTION:0x%x\n", 538 manfid, devid, ca->slot_info[slot].config_base, ca->slot_info[slot].config_option); 539 540 // success! 541 return 0; 542 } 543 544 545 /** 546 * Set CAM's configoption correctly. 547 * 548 * @param ca CA instance. 549 * @param slot Slot containing the CAM. 550 */ 551 static int dvb_ca_en50221_set_configoption(struct dvb_ca_private *ca, int slot) 552 { 553 int configoption; 554 555 dprintk("%s\n", __func__); 556 557 /* set the config option */ 558 ca->pub->write_attribute_mem(ca->pub, slot, 559 ca->slot_info[slot].config_base, 560 ca->slot_info[slot].config_option); 561 562 /* check it */ 563 configoption = ca->pub->read_attribute_mem(ca->pub, slot, ca->slot_info[slot].config_base); 564 dprintk("Set configoption 0x%x, read configoption 0x%x\n", 565 ca->slot_info[slot].config_option, configoption & 0x3f); 566 567 /* fine! */ 568 return 0; 569 570 } 571 572 573 /** 574 * This function talks to an EN50221 CAM control interface. It reads a buffer of 575 * data from the CAM. The data can either be stored in a supplied buffer, or 576 * automatically be added to the slot's rx_buffer. 577 * 578 * @param ca CA instance. 579 * @param slot Slot to read from. 580 * @param ebuf If non-NULL, the data will be written to this buffer. If NULL, 581 * the data will be added into the buffering system as a normal fragment. 582 * @param ecount Size of ebuf. Ignored if ebuf is NULL. 583 * 584 * @return Number of bytes read, or < 0 on error 585 */ 586 static int dvb_ca_en50221_read_data(struct dvb_ca_private *ca, int slot, u8 * ebuf, int ecount) 587 { 588 int bytes_read; 589 int status; 590 u8 buf[HOST_LINK_BUF_SIZE]; 591 int i; 592 593 dprintk("%s\n", __func__); 594 595 /* check if we have space for a link buf in the rx_buffer */ 596 if (ebuf == NULL) { 597 int buf_free; 598 599 if (ca->slot_info[slot].rx_buffer.data == NULL) { 600 status = -EIO; 601 goto exit; 602 } 603 buf_free = dvb_ringbuffer_free(&ca->slot_info[slot].rx_buffer); 604 605 if (buf_free < (ca->slot_info[slot].link_buf_size + DVB_RINGBUFFER_PKTHDRSIZE)) { 606 status = -EAGAIN; 607 goto exit; 608 } 609 } 610 611 /* check if there is data available */ 612 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS)) < 0) 613 goto exit; 614 if (!(status & STATUSREG_DA)) { 615 /* no data */ 616 status = 0; 617 goto exit; 618 } 619 620 /* read the amount of data */ 621 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_SIZE_HIGH)) < 0) 622 goto exit; 623 bytes_read = status << 8; 624 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_SIZE_LOW)) < 0) 625 goto exit; 626 bytes_read |= status; 627 628 /* check it will fit */ 629 if (ebuf == NULL) { 630 if (bytes_read > ca->slot_info[slot].link_buf_size) { 631 printk("dvb_ca adapter %d: CAM tried to send a buffer larger than the link buffer size (%i > %i)!\n", 632 ca->dvbdev->adapter->num, bytes_read, ca->slot_info[slot].link_buf_size); 633 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_LINKINIT; 634 status = -EIO; 635 goto exit; 636 } 637 if (bytes_read < 2) { 638 printk("dvb_ca adapter %d: CAM sent a buffer that was less than 2 bytes!\n", 639 ca->dvbdev->adapter->num); 640 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_LINKINIT; 641 status = -EIO; 642 goto exit; 643 } 644 } else { 645 if (bytes_read > ecount) { 646 printk("dvb_ca adapter %d: CAM tried to send a buffer larger than the ecount size!\n", 647 ca->dvbdev->adapter->num); 648 status = -EIO; 649 goto exit; 650 } 651 } 652 653 /* fill the buffer */ 654 for (i = 0; i < bytes_read; i++) { 655 /* read byte and check */ 656 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_DATA)) < 0) 657 goto exit; 658 659 /* OK, store it in the buffer */ 660 buf[i] = status; 661 } 662 663 /* check for read error (RE should now be 0) */ 664 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS)) < 0) 665 goto exit; 666 if (status & STATUSREG_RE) { 667 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_LINKINIT; 668 status = -EIO; 669 goto exit; 670 } 671 672 /* OK, add it to the receive buffer, or copy into external buffer if supplied */ 673 if (ebuf == NULL) { 674 if (ca->slot_info[slot].rx_buffer.data == NULL) { 675 status = -EIO; 676 goto exit; 677 } 678 dvb_ringbuffer_pkt_write(&ca->slot_info[slot].rx_buffer, buf, bytes_read); 679 } else { 680 memcpy(ebuf, buf, bytes_read); 681 } 682 683 dprintk("Received CA packet for slot %i connection id 0x%x last_frag:%i size:0x%x\n", slot, 684 buf[0], (buf[1] & 0x80) == 0, bytes_read); 685 686 /* wake up readers when a last_fragment is received */ 687 if ((buf[1] & 0x80) == 0x00) { 688 wake_up_interruptible(&ca->wait_queue); 689 } 690 status = bytes_read; 691 692 exit: 693 return status; 694 } 695 696 697 /** 698 * This function talks to an EN50221 CAM control interface. It writes a buffer of data 699 * to a CAM. 700 * 701 * @param ca CA instance. 702 * @param slot Slot to write to. 703 * @param ebuf The data in this buffer is treated as a complete link-level packet to 704 * be written. 705 * @param count Size of ebuf. 706 * 707 * @return Number of bytes written, or < 0 on error. 708 */ 709 static int dvb_ca_en50221_write_data(struct dvb_ca_private *ca, int slot, u8 * buf, int bytes_write) 710 { 711 int status; 712 int i; 713 714 dprintk("%s\n", __func__); 715 716 717 /* sanity check */ 718 if (bytes_write > ca->slot_info[slot].link_buf_size) 719 return -EINVAL; 720 721 /* it is possible we are dealing with a single buffer implementation, 722 thus if there is data available for read or if there is even a read 723 already in progress, we do nothing but awake the kernel thread to 724 process the data if necessary. */ 725 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS)) < 0) 726 goto exitnowrite; 727 if (status & (STATUSREG_DA | STATUSREG_RE)) { 728 if (status & STATUSREG_DA) 729 dvb_ca_en50221_thread_wakeup(ca); 730 731 status = -EAGAIN; 732 goto exitnowrite; 733 } 734 735 /* OK, set HC bit */ 736 if ((status = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, 737 IRQEN | CMDREG_HC)) != 0) 738 goto exit; 739 740 /* check if interface is still free */ 741 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS)) < 0) 742 goto exit; 743 if (!(status & STATUSREG_FR)) { 744 /* it wasn't free => try again later */ 745 status = -EAGAIN; 746 goto exit; 747 } 748 749 /* send the amount of data */ 750 if ((status = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_SIZE_HIGH, bytes_write >> 8)) != 0) 751 goto exit; 752 if ((status = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_SIZE_LOW, 753 bytes_write & 0xff)) != 0) 754 goto exit; 755 756 /* send the buffer */ 757 for (i = 0; i < bytes_write; i++) { 758 if ((status = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_DATA, buf[i])) != 0) 759 goto exit; 760 } 761 762 /* check for write error (WE should now be 0) */ 763 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS)) < 0) 764 goto exit; 765 if (status & STATUSREG_WE) { 766 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_LINKINIT; 767 status = -EIO; 768 goto exit; 769 } 770 status = bytes_write; 771 772 dprintk("Wrote CA packet for slot %i, connection id 0x%x last_frag:%i size:0x%x\n", slot, 773 buf[0], (buf[1] & 0x80) == 0, bytes_write); 774 775 exit: 776 ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, IRQEN); 777 778 exitnowrite: 779 return status; 780 } 781 EXPORT_SYMBOL(dvb_ca_en50221_camchange_irq); 782 783 784 785 /* ******************************************************************************** */ 786 /* EN50221 higher level functions */ 787 788 789 /** 790 * A CAM has been removed => shut it down. 791 * 792 * @param ca CA instance. 793 * @param slot Slot to shut down. 794 */ 795 static int dvb_ca_en50221_slot_shutdown(struct dvb_ca_private *ca, int slot) 796 { 797 dprintk("%s\n", __func__); 798 799 ca->pub->slot_shutdown(ca->pub, slot); 800 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_NONE; 801 802 /* need to wake up all processes to check if they're now 803 trying to write to a defunct CAM */ 804 wake_up_interruptible(&ca->wait_queue); 805 806 dprintk("Slot %i shutdown\n", slot); 807 808 /* success */ 809 return 0; 810 } 811 EXPORT_SYMBOL(dvb_ca_en50221_camready_irq); 812 813 814 /** 815 * A CAMCHANGE IRQ has occurred. 816 * 817 * @param ca CA instance. 818 * @param slot Slot concerned. 819 * @param change_type One of the DVB_CA_CAMCHANGE_* values. 820 */ 821 void dvb_ca_en50221_camchange_irq(struct dvb_ca_en50221 *pubca, int slot, int change_type) 822 { 823 struct dvb_ca_private *ca = pubca->private; 824 825 dprintk("CAMCHANGE IRQ slot:%i change_type:%i\n", slot, change_type); 826 827 switch (change_type) { 828 case DVB_CA_EN50221_CAMCHANGE_REMOVED: 829 case DVB_CA_EN50221_CAMCHANGE_INSERTED: 830 break; 831 832 default: 833 return; 834 } 835 836 ca->slot_info[slot].camchange_type = change_type; 837 atomic_inc(&ca->slot_info[slot].camchange_count); 838 dvb_ca_en50221_thread_wakeup(ca); 839 } 840 EXPORT_SYMBOL(dvb_ca_en50221_frda_irq); 841 842 843 /** 844 * A CAMREADY IRQ has occurred. 845 * 846 * @param ca CA instance. 847 * @param slot Slot concerned. 848 */ 849 void dvb_ca_en50221_camready_irq(struct dvb_ca_en50221 *pubca, int slot) 850 { 851 struct dvb_ca_private *ca = pubca->private; 852 853 dprintk("CAMREADY IRQ slot:%i\n", slot); 854 855 if (ca->slot_info[slot].slot_state == DVB_CA_SLOTSTATE_WAITREADY) { 856 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_VALIDATE; 857 dvb_ca_en50221_thread_wakeup(ca); 858 } 859 } 860 861 862 /** 863 * An FR or DA IRQ has occurred. 864 * 865 * @param ca CA instance. 866 * @param slot Slot concerned. 867 */ 868 void dvb_ca_en50221_frda_irq(struct dvb_ca_en50221 *pubca, int slot) 869 { 870 struct dvb_ca_private *ca = pubca->private; 871 int flags; 872 873 dprintk("FR/DA IRQ slot:%i\n", slot); 874 875 switch (ca->slot_info[slot].slot_state) { 876 case DVB_CA_SLOTSTATE_LINKINIT: 877 flags = ca->pub->read_cam_control(pubca, slot, CTRLIF_STATUS); 878 if (flags & STATUSREG_DA) { 879 dprintk("CAM supports DA IRQ\n"); 880 ca->slot_info[slot].da_irq_supported = 1; 881 } 882 break; 883 884 case DVB_CA_SLOTSTATE_RUNNING: 885 if (ca->open) 886 dvb_ca_en50221_thread_wakeup(ca); 887 break; 888 } 889 } 890 891 892 893 /* ******************************************************************************** */ 894 /* EN50221 thread functions */ 895 896 /** 897 * Wake up the DVB CA thread 898 * 899 * @param ca CA instance. 900 */ 901 static void dvb_ca_en50221_thread_wakeup(struct dvb_ca_private *ca) 902 { 903 904 dprintk("%s\n", __func__); 905 906 ca->wakeup = 1; 907 mb(); 908 wake_up_process(ca->thread); 909 } 910 911 /** 912 * Update the delay used by the thread. 913 * 914 * @param ca CA instance. 915 */ 916 static void dvb_ca_en50221_thread_update_delay(struct dvb_ca_private *ca) 917 { 918 int delay; 919 int curdelay = 100000000; 920 int slot; 921 922 /* Beware of too high polling frequency, because one polling 923 * call might take several hundred milliseconds until timeout! 924 */ 925 for (slot = 0; slot < ca->slot_count; slot++) { 926 switch (ca->slot_info[slot].slot_state) { 927 default: 928 case DVB_CA_SLOTSTATE_NONE: 929 delay = HZ * 60; /* 60s */ 930 if (!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE)) 931 delay = HZ * 5; /* 5s */ 932 break; 933 case DVB_CA_SLOTSTATE_INVALID: 934 delay = HZ * 60; /* 60s */ 935 if (!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE)) 936 delay = HZ / 10; /* 100ms */ 937 break; 938 939 case DVB_CA_SLOTSTATE_UNINITIALISED: 940 case DVB_CA_SLOTSTATE_WAITREADY: 941 case DVB_CA_SLOTSTATE_VALIDATE: 942 case DVB_CA_SLOTSTATE_WAITFR: 943 case DVB_CA_SLOTSTATE_LINKINIT: 944 delay = HZ / 10; /* 100ms */ 945 break; 946 947 case DVB_CA_SLOTSTATE_RUNNING: 948 delay = HZ * 60; /* 60s */ 949 if (!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE)) 950 delay = HZ / 10; /* 100ms */ 951 if (ca->open) { 952 if ((!ca->slot_info[slot].da_irq_supported) || 953 (!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_DA))) 954 delay = HZ / 10; /* 100ms */ 955 } 956 break; 957 } 958 959 if (delay < curdelay) 960 curdelay = delay; 961 } 962 963 ca->delay = curdelay; 964 } 965 966 967 968 /** 969 * Kernel thread which monitors CA slots for CAM changes, and performs data transfers. 970 */ 971 static int dvb_ca_en50221_thread(void *data) 972 { 973 struct dvb_ca_private *ca = data; 974 int slot; 975 int flags; 976 int status; 977 int pktcount; 978 void *rxbuf; 979 980 dprintk("%s\n", __func__); 981 982 /* choose the correct initial delay */ 983 dvb_ca_en50221_thread_update_delay(ca); 984 985 /* main loop */ 986 while (!kthread_should_stop()) { 987 /* sleep for a bit */ 988 if (!ca->wakeup) { 989 set_current_state(TASK_INTERRUPTIBLE); 990 schedule_timeout(ca->delay); 991 if (kthread_should_stop()) 992 return 0; 993 } 994 ca->wakeup = 0; 995 996 /* go through all the slots processing them */ 997 for (slot = 0; slot < ca->slot_count; slot++) { 998 999 mutex_lock(&ca->slot_info[slot].slot_lock); 1000 1001 // check the cam status + deal with CAMCHANGEs 1002 while (dvb_ca_en50221_check_camstatus(ca, slot)) { 1003 /* clear down an old CI slot if necessary */ 1004 if (ca->slot_info[slot].slot_state != DVB_CA_SLOTSTATE_NONE) 1005 dvb_ca_en50221_slot_shutdown(ca, slot); 1006 1007 /* if a CAM is NOW present, initialise it */ 1008 if (ca->slot_info[slot].camchange_type == DVB_CA_EN50221_CAMCHANGE_INSERTED) { 1009 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_UNINITIALISED; 1010 } 1011 1012 /* we've handled one CAMCHANGE */ 1013 dvb_ca_en50221_thread_update_delay(ca); 1014 atomic_dec(&ca->slot_info[slot].camchange_count); 1015 } 1016 1017 // CAM state machine 1018 switch (ca->slot_info[slot].slot_state) { 1019 case DVB_CA_SLOTSTATE_NONE: 1020 case DVB_CA_SLOTSTATE_INVALID: 1021 // no action needed 1022 break; 1023 1024 case DVB_CA_SLOTSTATE_UNINITIALISED: 1025 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_WAITREADY; 1026 ca->pub->slot_reset(ca->pub, slot); 1027 ca->slot_info[slot].timeout = jiffies + (INIT_TIMEOUT_SECS * HZ); 1028 break; 1029 1030 case DVB_CA_SLOTSTATE_WAITREADY: 1031 if (time_after(jiffies, ca->slot_info[slot].timeout)) { 1032 printk("dvb_ca adaptor %d: PC card did not respond :(\n", 1033 ca->dvbdev->adapter->num); 1034 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID; 1035 dvb_ca_en50221_thread_update_delay(ca); 1036 break; 1037 } 1038 // no other action needed; will automatically change state when ready 1039 break; 1040 1041 case DVB_CA_SLOTSTATE_VALIDATE: 1042 if (dvb_ca_en50221_parse_attributes(ca, slot) != 0) { 1043 /* we need this extra check for annoying interfaces like the budget-av */ 1044 if ((!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE)) && 1045 (ca->pub->poll_slot_status)) { 1046 status = ca->pub->poll_slot_status(ca->pub, slot, 0); 1047 if (!(status & DVB_CA_EN50221_POLL_CAM_PRESENT)) { 1048 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_NONE; 1049 dvb_ca_en50221_thread_update_delay(ca); 1050 break; 1051 } 1052 } 1053 1054 printk("dvb_ca adapter %d: Invalid PC card inserted :(\n", 1055 ca->dvbdev->adapter->num); 1056 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID; 1057 dvb_ca_en50221_thread_update_delay(ca); 1058 break; 1059 } 1060 if (dvb_ca_en50221_set_configoption(ca, slot) != 0) { 1061 printk("dvb_ca adapter %d: Unable to initialise CAM :(\n", 1062 ca->dvbdev->adapter->num); 1063 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID; 1064 dvb_ca_en50221_thread_update_delay(ca); 1065 break; 1066 } 1067 if (ca->pub->write_cam_control(ca->pub, slot, 1068 CTRLIF_COMMAND, CMDREG_RS) != 0) { 1069 printk("dvb_ca adapter %d: Unable to reset CAM IF\n", 1070 ca->dvbdev->adapter->num); 1071 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID; 1072 dvb_ca_en50221_thread_update_delay(ca); 1073 break; 1074 } 1075 dprintk("DVB CAM validated successfully\n"); 1076 1077 ca->slot_info[slot].timeout = jiffies + (INIT_TIMEOUT_SECS * HZ); 1078 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_WAITFR; 1079 ca->wakeup = 1; 1080 break; 1081 1082 case DVB_CA_SLOTSTATE_WAITFR: 1083 if (time_after(jiffies, ca->slot_info[slot].timeout)) { 1084 printk("dvb_ca adapter %d: DVB CAM did not respond :(\n", 1085 ca->dvbdev->adapter->num); 1086 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID; 1087 dvb_ca_en50221_thread_update_delay(ca); 1088 break; 1089 } 1090 1091 flags = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS); 1092 if (flags & STATUSREG_FR) { 1093 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_LINKINIT; 1094 ca->wakeup = 1; 1095 } 1096 break; 1097 1098 case DVB_CA_SLOTSTATE_LINKINIT: 1099 if (dvb_ca_en50221_link_init(ca, slot) != 0) { 1100 /* we need this extra check for annoying interfaces like the budget-av */ 1101 if ((!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE)) && 1102 (ca->pub->poll_slot_status)) { 1103 status = ca->pub->poll_slot_status(ca->pub, slot, 0); 1104 if (!(status & DVB_CA_EN50221_POLL_CAM_PRESENT)) { 1105 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_NONE; 1106 dvb_ca_en50221_thread_update_delay(ca); 1107 break; 1108 } 1109 } 1110 1111 printk("dvb_ca adapter %d: DVB CAM link initialisation failed :(\n", ca->dvbdev->adapter->num); 1112 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID; 1113 dvb_ca_en50221_thread_update_delay(ca); 1114 break; 1115 } 1116 1117 if (ca->slot_info[slot].rx_buffer.data == NULL) { 1118 rxbuf = vmalloc(RX_BUFFER_SIZE); 1119 if (rxbuf == NULL) { 1120 printk("dvb_ca adapter %d: Unable to allocate CAM rx buffer :(\n", ca->dvbdev->adapter->num); 1121 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID; 1122 dvb_ca_en50221_thread_update_delay(ca); 1123 break; 1124 } 1125 dvb_ringbuffer_init(&ca->slot_info[slot].rx_buffer, rxbuf, RX_BUFFER_SIZE); 1126 } 1127 1128 ca->pub->slot_ts_enable(ca->pub, slot); 1129 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_RUNNING; 1130 dvb_ca_en50221_thread_update_delay(ca); 1131 printk("dvb_ca adapter %d: DVB CAM detected and initialised successfully\n", ca->dvbdev->adapter->num); 1132 break; 1133 1134 case DVB_CA_SLOTSTATE_RUNNING: 1135 if (!ca->open) 1136 break; 1137 1138 // poll slots for data 1139 pktcount = 0; 1140 while ((status = dvb_ca_en50221_read_data(ca, slot, NULL, 0)) > 0) { 1141 if (!ca->open) 1142 break; 1143 1144 /* if a CAMCHANGE occurred at some point, do not do any more processing of this slot */ 1145 if (dvb_ca_en50221_check_camstatus(ca, slot)) { 1146 // we dont want to sleep on the next iteration so we can handle the cam change 1147 ca->wakeup = 1; 1148 break; 1149 } 1150 1151 /* check if we've hit our limit this time */ 1152 if (++pktcount >= MAX_RX_PACKETS_PER_ITERATION) { 1153 // dont sleep; there is likely to be more data to read 1154 ca->wakeup = 1; 1155 break; 1156 } 1157 } 1158 break; 1159 } 1160 1161 mutex_unlock(&ca->slot_info[slot].slot_lock); 1162 } 1163 } 1164 1165 return 0; 1166 } 1167 1168 1169 1170 /* ******************************************************************************** */ 1171 /* EN50221 IO interface functions */ 1172 1173 /** 1174 * Real ioctl implementation. 1175 * NOTE: CA_SEND_MSG/CA_GET_MSG ioctls have userspace buffers passed to them. 1176 * 1177 * @param inode Inode concerned. 1178 * @param file File concerned. 1179 * @param cmd IOCTL command. 1180 * @param arg Associated argument. 1181 * 1182 * @return 0 on success, <0 on error. 1183 */ 1184 static int dvb_ca_en50221_io_do_ioctl(struct file *file, 1185 unsigned int cmd, void *parg) 1186 { 1187 struct dvb_device *dvbdev = file->private_data; 1188 struct dvb_ca_private *ca = dvbdev->priv; 1189 int err = 0; 1190 int slot; 1191 1192 dprintk("%s\n", __func__); 1193 1194 switch (cmd) { 1195 case CA_RESET: 1196 for (slot = 0; slot < ca->slot_count; slot++) { 1197 mutex_lock(&ca->slot_info[slot].slot_lock); 1198 if (ca->slot_info[slot].slot_state != DVB_CA_SLOTSTATE_NONE) { 1199 dvb_ca_en50221_slot_shutdown(ca, slot); 1200 if (ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE) 1201 dvb_ca_en50221_camchange_irq(ca->pub, 1202 slot, 1203 DVB_CA_EN50221_CAMCHANGE_INSERTED); 1204 } 1205 mutex_unlock(&ca->slot_info[slot].slot_lock); 1206 } 1207 ca->next_read_slot = 0; 1208 dvb_ca_en50221_thread_wakeup(ca); 1209 break; 1210 1211 case CA_GET_CAP: { 1212 struct ca_caps *caps = parg; 1213 1214 caps->slot_num = ca->slot_count; 1215 caps->slot_type = CA_CI_LINK; 1216 caps->descr_num = 0; 1217 caps->descr_type = 0; 1218 break; 1219 } 1220 1221 case CA_GET_SLOT_INFO: { 1222 struct ca_slot_info *info = parg; 1223 1224 if ((info->num > ca->slot_count) || (info->num < 0)) 1225 return -EINVAL; 1226 1227 info->type = CA_CI_LINK; 1228 info->flags = 0; 1229 if ((ca->slot_info[info->num].slot_state != DVB_CA_SLOTSTATE_NONE) 1230 && (ca->slot_info[info->num].slot_state != DVB_CA_SLOTSTATE_INVALID)) { 1231 info->flags = CA_CI_MODULE_PRESENT; 1232 } 1233 if (ca->slot_info[info->num].slot_state == DVB_CA_SLOTSTATE_RUNNING) { 1234 info->flags |= CA_CI_MODULE_READY; 1235 } 1236 break; 1237 } 1238 1239 default: 1240 err = -EINVAL; 1241 break; 1242 } 1243 1244 return err; 1245 } 1246 1247 1248 /** 1249 * Wrapper for ioctl implementation. 1250 * 1251 * @param inode Inode concerned. 1252 * @param file File concerned. 1253 * @param cmd IOCTL command. 1254 * @param arg Associated argument. 1255 * 1256 * @return 0 on success, <0 on error. 1257 */ 1258 static long dvb_ca_en50221_io_ioctl(struct file *file, 1259 unsigned int cmd, unsigned long arg) 1260 { 1261 return dvb_usercopy(file, cmd, arg, dvb_ca_en50221_io_do_ioctl); 1262 } 1263 1264 1265 /** 1266 * Implementation of write() syscall. 1267 * 1268 * @param file File structure. 1269 * @param buf Source buffer. 1270 * @param count Size of source buffer. 1271 * @param ppos Position in file (ignored). 1272 * 1273 * @return Number of bytes read, or <0 on error. 1274 */ 1275 static ssize_t dvb_ca_en50221_io_write(struct file *file, 1276 const char __user * buf, size_t count, loff_t * ppos) 1277 { 1278 struct dvb_device *dvbdev = file->private_data; 1279 struct dvb_ca_private *ca = dvbdev->priv; 1280 u8 slot, connection_id; 1281 int status; 1282 u8 fragbuf[HOST_LINK_BUF_SIZE]; 1283 int fragpos = 0; 1284 int fraglen; 1285 unsigned long timeout; 1286 int written; 1287 1288 dprintk("%s\n", __func__); 1289 1290 /* Incoming packet has a 2 byte header. hdr[0] = slot_id, hdr[1] = connection_id */ 1291 if (count < 2) 1292 return -EINVAL; 1293 1294 /* extract slot & connection id */ 1295 if (copy_from_user(&slot, buf, 1)) 1296 return -EFAULT; 1297 if (copy_from_user(&connection_id, buf + 1, 1)) 1298 return -EFAULT; 1299 buf += 2; 1300 count -= 2; 1301 1302 /* check if the slot is actually running */ 1303 if (ca->slot_info[slot].slot_state != DVB_CA_SLOTSTATE_RUNNING) 1304 return -EINVAL; 1305 1306 /* fragment the packets & store in the buffer */ 1307 while (fragpos < count) { 1308 fraglen = ca->slot_info[slot].link_buf_size - 2; 1309 if (fraglen < 0) 1310 break; 1311 if (fraglen > HOST_LINK_BUF_SIZE - 2) 1312 fraglen = HOST_LINK_BUF_SIZE - 2; 1313 if ((count - fragpos) < fraglen) 1314 fraglen = count - fragpos; 1315 1316 fragbuf[0] = connection_id; 1317 fragbuf[1] = ((fragpos + fraglen) < count) ? 0x80 : 0x00; 1318 status = copy_from_user(fragbuf + 2, buf + fragpos, fraglen); 1319 if (status) { 1320 status = -EFAULT; 1321 goto exit; 1322 } 1323 1324 timeout = jiffies + HZ / 2; 1325 written = 0; 1326 while (!time_after(jiffies, timeout)) { 1327 /* check the CAM hasn't been removed/reset in the meantime */ 1328 if (ca->slot_info[slot].slot_state != DVB_CA_SLOTSTATE_RUNNING) { 1329 status = -EIO; 1330 goto exit; 1331 } 1332 1333 mutex_lock(&ca->slot_info[slot].slot_lock); 1334 status = dvb_ca_en50221_write_data(ca, slot, fragbuf, fraglen + 2); 1335 mutex_unlock(&ca->slot_info[slot].slot_lock); 1336 if (status == (fraglen + 2)) { 1337 written = 1; 1338 break; 1339 } 1340 if (status != -EAGAIN) 1341 goto exit; 1342 1343 msleep(1); 1344 } 1345 if (!written) { 1346 status = -EIO; 1347 goto exit; 1348 } 1349 1350 fragpos += fraglen; 1351 } 1352 status = count + 2; 1353 1354 exit: 1355 return status; 1356 } 1357 1358 1359 /** 1360 * Condition for waking up in dvb_ca_en50221_io_read_condition 1361 */ 1362 static int dvb_ca_en50221_io_read_condition(struct dvb_ca_private *ca, 1363 int *result, int *_slot) 1364 { 1365 int slot; 1366 int slot_count = 0; 1367 int idx; 1368 size_t fraglen; 1369 int connection_id = -1; 1370 int found = 0; 1371 u8 hdr[2]; 1372 1373 slot = ca->next_read_slot; 1374 while ((slot_count < ca->slot_count) && (!found)) { 1375 if (ca->slot_info[slot].slot_state != DVB_CA_SLOTSTATE_RUNNING) 1376 goto nextslot; 1377 1378 if (ca->slot_info[slot].rx_buffer.data == NULL) { 1379 return 0; 1380 } 1381 1382 idx = dvb_ringbuffer_pkt_next(&ca->slot_info[slot].rx_buffer, -1, &fraglen); 1383 while (idx != -1) { 1384 dvb_ringbuffer_pkt_read(&ca->slot_info[slot].rx_buffer, idx, 0, hdr, 2); 1385 if (connection_id == -1) 1386 connection_id = hdr[0]; 1387 if ((hdr[0] == connection_id) && ((hdr[1] & 0x80) == 0)) { 1388 *_slot = slot; 1389 found = 1; 1390 break; 1391 } 1392 1393 idx = dvb_ringbuffer_pkt_next(&ca->slot_info[slot].rx_buffer, idx, &fraglen); 1394 } 1395 1396 nextslot: 1397 slot = (slot + 1) % ca->slot_count; 1398 slot_count++; 1399 } 1400 1401 ca->next_read_slot = slot; 1402 return found; 1403 } 1404 1405 1406 /** 1407 * Implementation of read() syscall. 1408 * 1409 * @param file File structure. 1410 * @param buf Destination buffer. 1411 * @param count Size of destination buffer. 1412 * @param ppos Position in file (ignored). 1413 * 1414 * @return Number of bytes read, or <0 on error. 1415 */ 1416 static ssize_t dvb_ca_en50221_io_read(struct file *file, char __user * buf, 1417 size_t count, loff_t * ppos) 1418 { 1419 struct dvb_device *dvbdev = file->private_data; 1420 struct dvb_ca_private *ca = dvbdev->priv; 1421 int status; 1422 int result = 0; 1423 u8 hdr[2]; 1424 int slot; 1425 int connection_id = -1; 1426 size_t idx, idx2; 1427 int last_fragment = 0; 1428 size_t fraglen; 1429 int pktlen; 1430 int dispose = 0; 1431 1432 dprintk("%s\n", __func__); 1433 1434 /* Outgoing packet has a 2 byte header. hdr[0] = slot_id, hdr[1] = connection_id */ 1435 if (count < 2) 1436 return -EINVAL; 1437 1438 /* wait for some data */ 1439 if ((status = dvb_ca_en50221_io_read_condition(ca, &result, &slot)) == 0) { 1440 1441 /* if we're in nonblocking mode, exit immediately */ 1442 if (file->f_flags & O_NONBLOCK) 1443 return -EWOULDBLOCK; 1444 1445 /* wait for some data */ 1446 status = wait_event_interruptible(ca->wait_queue, 1447 dvb_ca_en50221_io_read_condition 1448 (ca, &result, &slot)); 1449 } 1450 if ((status < 0) || (result < 0)) { 1451 if (result) 1452 return result; 1453 return status; 1454 } 1455 1456 idx = dvb_ringbuffer_pkt_next(&ca->slot_info[slot].rx_buffer, -1, &fraglen); 1457 pktlen = 2; 1458 do { 1459 if (idx == -1) { 1460 printk("dvb_ca adapter %d: BUG: read packet ended before last_fragment encountered\n", ca->dvbdev->adapter->num); 1461 status = -EIO; 1462 goto exit; 1463 } 1464 1465 dvb_ringbuffer_pkt_read(&ca->slot_info[slot].rx_buffer, idx, 0, hdr, 2); 1466 if (connection_id == -1) 1467 connection_id = hdr[0]; 1468 if (hdr[0] == connection_id) { 1469 if (pktlen < count) { 1470 if ((pktlen + fraglen - 2) > count) { 1471 fraglen = count - pktlen; 1472 } else { 1473 fraglen -= 2; 1474 } 1475 1476 if ((status = dvb_ringbuffer_pkt_read_user(&ca->slot_info[slot].rx_buffer, idx, 2, 1477 buf + pktlen, fraglen)) < 0) { 1478 goto exit; 1479 } 1480 pktlen += fraglen; 1481 } 1482 1483 if ((hdr[1] & 0x80) == 0) 1484 last_fragment = 1; 1485 dispose = 1; 1486 } 1487 1488 idx2 = dvb_ringbuffer_pkt_next(&ca->slot_info[slot].rx_buffer, idx, &fraglen); 1489 if (dispose) 1490 dvb_ringbuffer_pkt_dispose(&ca->slot_info[slot].rx_buffer, idx); 1491 idx = idx2; 1492 dispose = 0; 1493 } while (!last_fragment); 1494 1495 hdr[0] = slot; 1496 hdr[1] = connection_id; 1497 status = copy_to_user(buf, hdr, 2); 1498 if (status) { 1499 status = -EFAULT; 1500 goto exit; 1501 } 1502 status = pktlen; 1503 1504 exit: 1505 return status; 1506 } 1507 1508 1509 /** 1510 * Implementation of file open syscall. 1511 * 1512 * @param inode Inode concerned. 1513 * @param file File concerned. 1514 * 1515 * @return 0 on success, <0 on failure. 1516 */ 1517 static int dvb_ca_en50221_io_open(struct inode *inode, struct file *file) 1518 { 1519 struct dvb_device *dvbdev = file->private_data; 1520 struct dvb_ca_private *ca = dvbdev->priv; 1521 int err; 1522 int i; 1523 1524 dprintk("%s\n", __func__); 1525 1526 if (!try_module_get(ca->pub->owner)) 1527 return -EIO; 1528 1529 err = dvb_generic_open(inode, file); 1530 if (err < 0) { 1531 module_put(ca->pub->owner); 1532 return err; 1533 } 1534 1535 for (i = 0; i < ca->slot_count; i++) { 1536 1537 if (ca->slot_info[i].slot_state == DVB_CA_SLOTSTATE_RUNNING) { 1538 if (ca->slot_info[i].rx_buffer.data != NULL) { 1539 /* it is safe to call this here without locks because 1540 * ca->open == 0. Data is not read in this case */ 1541 dvb_ringbuffer_flush(&ca->slot_info[i].rx_buffer); 1542 } 1543 } 1544 } 1545 1546 ca->open = 1; 1547 dvb_ca_en50221_thread_update_delay(ca); 1548 dvb_ca_en50221_thread_wakeup(ca); 1549 1550 return 0; 1551 } 1552 1553 1554 /** 1555 * Implementation of file close syscall. 1556 * 1557 * @param inode Inode concerned. 1558 * @param file File concerned. 1559 * 1560 * @return 0 on success, <0 on failure. 1561 */ 1562 static int dvb_ca_en50221_io_release(struct inode *inode, struct file *file) 1563 { 1564 struct dvb_device *dvbdev = file->private_data; 1565 struct dvb_ca_private *ca = dvbdev->priv; 1566 int err; 1567 1568 dprintk("%s\n", __func__); 1569 1570 /* mark the CA device as closed */ 1571 ca->open = 0; 1572 dvb_ca_en50221_thread_update_delay(ca); 1573 1574 err = dvb_generic_release(inode, file); 1575 1576 module_put(ca->pub->owner); 1577 1578 return err; 1579 } 1580 1581 1582 /** 1583 * Implementation of poll() syscall. 1584 * 1585 * @param file File concerned. 1586 * @param wait poll wait table. 1587 * 1588 * @return Standard poll mask. 1589 */ 1590 static unsigned int dvb_ca_en50221_io_poll(struct file *file, poll_table * wait) 1591 { 1592 struct dvb_device *dvbdev = file->private_data; 1593 struct dvb_ca_private *ca = dvbdev->priv; 1594 unsigned int mask = 0; 1595 int slot; 1596 int result = 0; 1597 1598 dprintk("%s\n", __func__); 1599 1600 if (dvb_ca_en50221_io_read_condition(ca, &result, &slot) == 1) { 1601 mask |= POLLIN; 1602 } 1603 1604 /* if there is something, return now */ 1605 if (mask) 1606 return mask; 1607 1608 /* wait for something to happen */ 1609 poll_wait(file, &ca->wait_queue, wait); 1610 1611 if (dvb_ca_en50221_io_read_condition(ca, &result, &slot) == 1) { 1612 mask |= POLLIN; 1613 } 1614 1615 return mask; 1616 } 1617 EXPORT_SYMBOL(dvb_ca_en50221_init); 1618 1619 1620 static const struct file_operations dvb_ca_fops = { 1621 .owner = THIS_MODULE, 1622 .read = dvb_ca_en50221_io_read, 1623 .write = dvb_ca_en50221_io_write, 1624 .unlocked_ioctl = dvb_ca_en50221_io_ioctl, 1625 .open = dvb_ca_en50221_io_open, 1626 .release = dvb_ca_en50221_io_release, 1627 .poll = dvb_ca_en50221_io_poll, 1628 .llseek = noop_llseek, 1629 }; 1630 1631 static struct dvb_device dvbdev_ca = { 1632 .priv = NULL, 1633 .users = 1, 1634 .readers = 1, 1635 .writers = 1, 1636 .fops = &dvb_ca_fops, 1637 }; 1638 1639 1640 /* ******************************************************************************** */ 1641 /* Initialisation/shutdown functions */ 1642 1643 1644 /** 1645 * Initialise a new DVB CA EN50221 interface device. 1646 * 1647 * @param dvb_adapter DVB adapter to attach the new CA device to. 1648 * @param ca The dvb_ca instance. 1649 * @param flags Flags describing the CA device (DVB_CA_FLAG_*). 1650 * @param slot_count Number of slots supported. 1651 * 1652 * @return 0 on success, nonzero on failure 1653 */ 1654 int dvb_ca_en50221_init(struct dvb_adapter *dvb_adapter, 1655 struct dvb_ca_en50221 *pubca, int flags, int slot_count) 1656 { 1657 int ret; 1658 struct dvb_ca_private *ca = NULL; 1659 int i; 1660 1661 dprintk("%s\n", __func__); 1662 1663 if (slot_count < 1) 1664 return -EINVAL; 1665 1666 /* initialise the system data */ 1667 if ((ca = kzalloc(sizeof(struct dvb_ca_private), GFP_KERNEL)) == NULL) { 1668 ret = -ENOMEM; 1669 goto error; 1670 } 1671 ca->pub = pubca; 1672 ca->flags = flags; 1673 ca->slot_count = slot_count; 1674 if ((ca->slot_info = kcalloc(slot_count, sizeof(struct dvb_ca_slot), GFP_KERNEL)) == NULL) { 1675 ret = -ENOMEM; 1676 goto error; 1677 } 1678 init_waitqueue_head(&ca->wait_queue); 1679 ca->open = 0; 1680 ca->wakeup = 0; 1681 ca->next_read_slot = 0; 1682 pubca->private = ca; 1683 1684 /* register the DVB device */ 1685 ret = dvb_register_device(dvb_adapter, &ca->dvbdev, &dvbdev_ca, ca, DVB_DEVICE_CA); 1686 if (ret) 1687 goto error; 1688 1689 /* now initialise each slot */ 1690 for (i = 0; i < slot_count; i++) { 1691 memset(&ca->slot_info[i], 0, sizeof(struct dvb_ca_slot)); 1692 ca->slot_info[i].slot_state = DVB_CA_SLOTSTATE_NONE; 1693 atomic_set(&ca->slot_info[i].camchange_count, 0); 1694 ca->slot_info[i].camchange_type = DVB_CA_EN50221_CAMCHANGE_REMOVED; 1695 mutex_init(&ca->slot_info[i].slot_lock); 1696 } 1697 1698 if (signal_pending(current)) { 1699 ret = -EINTR; 1700 goto error; 1701 } 1702 mb(); 1703 1704 /* create a kthread for monitoring this CA device */ 1705 ca->thread = kthread_run(dvb_ca_en50221_thread, ca, "kdvb-ca-%i:%i", 1706 ca->dvbdev->adapter->num, ca->dvbdev->id); 1707 if (IS_ERR(ca->thread)) { 1708 ret = PTR_ERR(ca->thread); 1709 printk("dvb_ca_init: failed to start kernel_thread (%d)\n", 1710 ret); 1711 goto error; 1712 } 1713 return 0; 1714 1715 error: 1716 if (ca != NULL) { 1717 if (ca->dvbdev != NULL) 1718 dvb_unregister_device(ca->dvbdev); 1719 kfree(ca->slot_info); 1720 kfree(ca); 1721 } 1722 pubca->private = NULL; 1723 return ret; 1724 } 1725 EXPORT_SYMBOL(dvb_ca_en50221_release); 1726 1727 1728 1729 /** 1730 * Release a DVB CA EN50221 interface device. 1731 * 1732 * @param ca_dev The dvb_device_t instance for the CA device. 1733 * @param ca The associated dvb_ca instance. 1734 */ 1735 void dvb_ca_en50221_release(struct dvb_ca_en50221 *pubca) 1736 { 1737 struct dvb_ca_private *ca = pubca->private; 1738 int i; 1739 1740 dprintk("%s\n", __func__); 1741 1742 /* shutdown the thread if there was one */ 1743 kthread_stop(ca->thread); 1744 1745 for (i = 0; i < ca->slot_count; i++) { 1746 dvb_ca_en50221_slot_shutdown(ca, i); 1747 vfree(ca->slot_info[i].rx_buffer.data); 1748 } 1749 kfree(ca->slot_info); 1750 dvb_unregister_device(ca->dvbdev); 1751 kfree(ca); 1752 pubca->private = NULL; 1753 } 1754