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 /* mutex serializing ioctls */ 161 struct mutex ioctl_mutex; 162 }; 163 164 static void dvb_ca_en50221_thread_wakeup(struct dvb_ca_private *ca); 165 static int dvb_ca_en50221_read_data(struct dvb_ca_private *ca, int slot, u8 * ebuf, int ecount); 166 static int dvb_ca_en50221_write_data(struct dvb_ca_private *ca, int slot, u8 * ebuf, int ecount); 167 168 169 /** 170 * Safely find needle in haystack. 171 * 172 * @haystack: Buffer to look in. 173 * @hlen: Number of bytes in haystack. 174 * @needle: Buffer to find. 175 * @nlen: Number of bytes in needle. 176 * @return Pointer into haystack needle was found at, or NULL if not found. 177 */ 178 static char *findstr(char * haystack, int hlen, char * needle, int nlen) 179 { 180 int i; 181 182 if (hlen < nlen) 183 return NULL; 184 185 for (i = 0; i <= hlen - nlen; i++) { 186 if (!strncmp(haystack + i, needle, nlen)) 187 return haystack + i; 188 } 189 190 return NULL; 191 } 192 193 194 195 /* ******************************************************************************** */ 196 /* EN50221 physical interface functions */ 197 198 199 /** 200 * dvb_ca_en50221_check_camstatus - Check CAM status. 201 */ 202 static int dvb_ca_en50221_check_camstatus(struct dvb_ca_private *ca, int slot) 203 { 204 int slot_status; 205 int cam_present_now; 206 int cam_changed; 207 208 /* IRQ mode */ 209 if (ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE) { 210 return (atomic_read(&ca->slot_info[slot].camchange_count) != 0); 211 } 212 213 /* poll mode */ 214 slot_status = ca->pub->poll_slot_status(ca->pub, slot, ca->open); 215 216 cam_present_now = (slot_status & DVB_CA_EN50221_POLL_CAM_PRESENT) ? 1 : 0; 217 cam_changed = (slot_status & DVB_CA_EN50221_POLL_CAM_CHANGED) ? 1 : 0; 218 if (!cam_changed) { 219 int cam_present_old = (ca->slot_info[slot].slot_state != DVB_CA_SLOTSTATE_NONE); 220 cam_changed = (cam_present_now != cam_present_old); 221 } 222 223 if (cam_changed) { 224 if (!cam_present_now) { 225 ca->slot_info[slot].camchange_type = DVB_CA_EN50221_CAMCHANGE_REMOVED; 226 } else { 227 ca->slot_info[slot].camchange_type = DVB_CA_EN50221_CAMCHANGE_INSERTED; 228 } 229 atomic_set(&ca->slot_info[slot].camchange_count, 1); 230 } else { 231 if ((ca->slot_info[slot].slot_state == DVB_CA_SLOTSTATE_WAITREADY) && 232 (slot_status & DVB_CA_EN50221_POLL_CAM_READY)) { 233 // move to validate state if reset is completed 234 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_VALIDATE; 235 } 236 } 237 238 return cam_changed; 239 } 240 241 242 /** 243 * dvb_ca_en50221_wait_if_status - Wait for flags to become set on the STATUS 244 * register on a CAM interface, checking for errors and timeout. 245 * 246 * @ca: CA instance. 247 * @slot: Slot on interface. 248 * @waitfor: Flags to wait for. 249 * @timeout_ms: Timeout in milliseconds. 250 * 251 * @return 0 on success, nonzero on error. 252 */ 253 static int dvb_ca_en50221_wait_if_status(struct dvb_ca_private *ca, int slot, 254 u8 waitfor, int timeout_hz) 255 { 256 unsigned long timeout; 257 unsigned long start; 258 259 dprintk("%s\n", __func__); 260 261 /* loop until timeout elapsed */ 262 start = jiffies; 263 timeout = jiffies + timeout_hz; 264 while (1) { 265 /* read the status and check for error */ 266 int res = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS); 267 if (res < 0) 268 return -EIO; 269 270 /* if we got the flags, it was successful! */ 271 if (res & waitfor) { 272 dprintk("%s succeeded timeout:%lu\n", __func__, jiffies - start); 273 return 0; 274 } 275 276 /* check for timeout */ 277 if (time_after(jiffies, timeout)) { 278 break; 279 } 280 281 /* wait for a bit */ 282 msleep(1); 283 } 284 285 dprintk("%s failed timeout:%lu\n", __func__, jiffies - start); 286 287 /* if we get here, we've timed out */ 288 return -ETIMEDOUT; 289 } 290 291 292 /** 293 * dvb_ca_en50221_link_init - Initialise the link layer connection to a CAM. 294 * 295 * @ca: CA instance. 296 * @slot: Slot id. 297 * 298 * @return 0 on success, nonzero on failure. 299 */ 300 static int dvb_ca_en50221_link_init(struct dvb_ca_private *ca, int slot) 301 { 302 int ret; 303 int buf_size; 304 u8 buf[2]; 305 306 dprintk("%s\n", __func__); 307 308 /* we'll be determining these during this function */ 309 ca->slot_info[slot].da_irq_supported = 0; 310 311 /* set the host link buffer size temporarily. it will be overwritten with the 312 * real negotiated size later. */ 313 ca->slot_info[slot].link_buf_size = 2; 314 315 /* read the buffer size from the CAM */ 316 if ((ret = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, IRQEN | CMDREG_SR)) != 0) 317 return ret; 318 if ((ret = dvb_ca_en50221_wait_if_status(ca, slot, STATUSREG_DA, HZ / 10)) != 0) 319 return ret; 320 if ((ret = dvb_ca_en50221_read_data(ca, slot, buf, 2)) != 2) 321 return -EIO; 322 if ((ret = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, IRQEN)) != 0) 323 return ret; 324 325 /* store it, and choose the minimum of our buffer and the CAM's buffer size */ 326 buf_size = (buf[0] << 8) | buf[1]; 327 if (buf_size > HOST_LINK_BUF_SIZE) 328 buf_size = HOST_LINK_BUF_SIZE; 329 ca->slot_info[slot].link_buf_size = buf_size; 330 buf[0] = buf_size >> 8; 331 buf[1] = buf_size & 0xff; 332 dprintk("Chosen link buffer size of %i\n", buf_size); 333 334 /* write the buffer size to the CAM */ 335 if ((ret = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, IRQEN | CMDREG_SW)) != 0) 336 return ret; 337 if ((ret = dvb_ca_en50221_wait_if_status(ca, slot, STATUSREG_FR, HZ / 10)) != 0) 338 return ret; 339 if ((ret = dvb_ca_en50221_write_data(ca, slot, buf, 2)) != 2) 340 return -EIO; 341 if ((ret = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, IRQEN)) != 0) 342 return ret; 343 344 /* success */ 345 return 0; 346 } 347 348 /** 349 * dvb_ca_en50221_read_tuple - Read a tuple from attribute memory. 350 * 351 * @ca: CA instance. 352 * @slot: Slot id. 353 * @address: Address to read from. Updated. 354 * @tupleType: Tuple id byte. Updated. 355 * @tupleLength: Tuple length. Updated. 356 * @tuple: Dest buffer for tuple (must be 256 bytes). Updated. 357 * 358 * @return 0 on success, nonzero on error. 359 */ 360 static int dvb_ca_en50221_read_tuple(struct dvb_ca_private *ca, int slot, 361 int *address, int *tupleType, int *tupleLength, u8 * tuple) 362 { 363 int i; 364 int _tupleType; 365 int _tupleLength; 366 int _address = *address; 367 368 /* grab the next tuple length and type */ 369 if ((_tupleType = ca->pub->read_attribute_mem(ca->pub, slot, _address)) < 0) 370 return _tupleType; 371 if (_tupleType == 0xff) { 372 dprintk("END OF CHAIN TUPLE type:0x%x\n", _tupleType); 373 *address += 2; 374 *tupleType = _tupleType; 375 *tupleLength = 0; 376 return 0; 377 } 378 if ((_tupleLength = ca->pub->read_attribute_mem(ca->pub, slot, _address + 2)) < 0) 379 return _tupleLength; 380 _address += 4; 381 382 dprintk("TUPLE type:0x%x length:%i\n", _tupleType, _tupleLength); 383 384 /* read in the whole tuple */ 385 for (i = 0; i < _tupleLength; i++) { 386 tuple[i] = ca->pub->read_attribute_mem(ca->pub, slot, _address + (i * 2)); 387 dprintk(" 0x%02x: 0x%02x %c\n", 388 i, tuple[i] & 0xff, 389 ((tuple[i] > 31) && (tuple[i] < 127)) ? tuple[i] : '.'); 390 } 391 _address += (_tupleLength * 2); 392 393 // success 394 *tupleType = _tupleType; 395 *tupleLength = _tupleLength; 396 *address = _address; 397 return 0; 398 } 399 400 401 /** 402 * dvb_ca_en50221_parse_attributes - Parse attribute memory of a CAM module, 403 * extracting Config register, and checking it is a DVB CAM module. 404 * 405 * @ca: CA instance. 406 * @slot: Slot id. 407 * 408 * @return 0 on success, <0 on failure. 409 */ 410 static int dvb_ca_en50221_parse_attributes(struct dvb_ca_private *ca, int slot) 411 { 412 int address = 0; 413 int tupleLength; 414 int tupleType; 415 u8 tuple[257]; 416 char *dvb_str; 417 int rasz; 418 int status; 419 int got_cftableentry = 0; 420 int end_chain = 0; 421 int i; 422 u16 manfid = 0; 423 u16 devid = 0; 424 425 426 // CISTPL_DEVICE_0A 427 if ((status = 428 dvb_ca_en50221_read_tuple(ca, slot, &address, &tupleType, &tupleLength, tuple)) < 0) 429 return status; 430 if (tupleType != 0x1D) 431 return -EINVAL; 432 433 434 435 // CISTPL_DEVICE_0C 436 if ((status = 437 dvb_ca_en50221_read_tuple(ca, slot, &address, &tupleType, &tupleLength, tuple)) < 0) 438 return status; 439 if (tupleType != 0x1C) 440 return -EINVAL; 441 442 443 444 // CISTPL_VERS_1 445 if ((status = 446 dvb_ca_en50221_read_tuple(ca, slot, &address, &tupleType, &tupleLength, tuple)) < 0) 447 return status; 448 if (tupleType != 0x15) 449 return -EINVAL; 450 451 452 453 // CISTPL_MANFID 454 if ((status = dvb_ca_en50221_read_tuple(ca, slot, &address, &tupleType, 455 &tupleLength, tuple)) < 0) 456 return status; 457 if (tupleType != 0x20) 458 return -EINVAL; 459 if (tupleLength != 4) 460 return -EINVAL; 461 manfid = (tuple[1] << 8) | tuple[0]; 462 devid = (tuple[3] << 8) | tuple[2]; 463 464 465 466 // CISTPL_CONFIG 467 if ((status = dvb_ca_en50221_read_tuple(ca, slot, &address, &tupleType, 468 &tupleLength, tuple)) < 0) 469 return status; 470 if (tupleType != 0x1A) 471 return -EINVAL; 472 if (tupleLength < 3) 473 return -EINVAL; 474 475 /* extract the configbase */ 476 rasz = tuple[0] & 3; 477 if (tupleLength < (3 + rasz + 14)) 478 return -EINVAL; 479 ca->slot_info[slot].config_base = 0; 480 for (i = 0; i < rasz + 1; i++) { 481 ca->slot_info[slot].config_base |= (tuple[2 + i] << (8 * i)); 482 } 483 484 /* check it contains the correct DVB string */ 485 dvb_str = findstr((char *)tuple, tupleLength, "DVB_CI_V", 8); 486 if (dvb_str == NULL) 487 return -EINVAL; 488 if (tupleLength < ((dvb_str - (char *) tuple) + 12)) 489 return -EINVAL; 490 491 /* is it a version we support? */ 492 if (strncmp(dvb_str + 8, "1.00", 4)) { 493 printk("dvb_ca adapter %d: Unsupported DVB CAM module version %c%c%c%c\n", 494 ca->dvbdev->adapter->num, dvb_str[8], dvb_str[9], dvb_str[10], dvb_str[11]); 495 return -EINVAL; 496 } 497 498 /* process the CFTABLE_ENTRY tuples, and any after those */ 499 while ((!end_chain) && (address < 0x1000)) { 500 if ((status = dvb_ca_en50221_read_tuple(ca, slot, &address, &tupleType, 501 &tupleLength, tuple)) < 0) 502 return status; 503 switch (tupleType) { 504 case 0x1B: // CISTPL_CFTABLE_ENTRY 505 if (tupleLength < (2 + 11 + 17)) 506 break; 507 508 /* if we've already parsed one, just use it */ 509 if (got_cftableentry) 510 break; 511 512 /* get the config option */ 513 ca->slot_info[slot].config_option = tuple[0] & 0x3f; 514 515 /* OK, check it contains the correct strings */ 516 if ((findstr((char *)tuple, tupleLength, "DVB_HOST", 8) == NULL) || 517 (findstr((char *)tuple, tupleLength, "DVB_CI_MODULE", 13) == NULL)) 518 break; 519 520 got_cftableentry = 1; 521 break; 522 523 case 0x14: // CISTPL_NO_LINK 524 break; 525 526 case 0xFF: // CISTPL_END 527 end_chain = 1; 528 break; 529 530 default: /* Unknown tuple type - just skip this tuple and move to the next one */ 531 dprintk("dvb_ca: Skipping unknown tuple type:0x%x length:0x%x\n", tupleType, 532 tupleLength); 533 break; 534 } 535 } 536 537 if ((address > 0x1000) || (!got_cftableentry)) 538 return -EINVAL; 539 540 dprintk("Valid DVB CAM detected MANID:%x DEVID:%x CONFIGBASE:0x%x CONFIGOPTION:0x%x\n", 541 manfid, devid, ca->slot_info[slot].config_base, ca->slot_info[slot].config_option); 542 543 // success! 544 return 0; 545 } 546 547 548 /** 549 * dvb_ca_en50221_set_configoption - Set CAM's configoption correctly. 550 * 551 * @ca: CA instance. 552 * @slot: Slot containing the CAM. 553 */ 554 static int dvb_ca_en50221_set_configoption(struct dvb_ca_private *ca, int slot) 555 { 556 int configoption; 557 558 dprintk("%s\n", __func__); 559 560 /* set the config option */ 561 ca->pub->write_attribute_mem(ca->pub, slot, 562 ca->slot_info[slot].config_base, 563 ca->slot_info[slot].config_option); 564 565 /* check it */ 566 configoption = ca->pub->read_attribute_mem(ca->pub, slot, ca->slot_info[slot].config_base); 567 dprintk("Set configoption 0x%x, read configoption 0x%x\n", 568 ca->slot_info[slot].config_option, configoption & 0x3f); 569 570 /* fine! */ 571 return 0; 572 573 } 574 575 576 /** 577 * dvb_ca_en50221_read_data - This function talks to an EN50221 CAM control 578 * interface. It reads a buffer of data from the CAM. The data can either 579 * be stored in a supplied buffer, or automatically be added to the slot's 580 * rx_buffer. 581 * 582 * @ca: CA instance. 583 * @slot: Slot to read from. 584 * @ebuf: If non-NULL, the data will be written to this buffer. If NULL, 585 * the data will be added into the buffering system as a normal fragment. 586 * @ecount: Size of ebuf. Ignored if ebuf is NULL. 587 * 588 * @return Number of bytes read, or < 0 on error 589 */ 590 static int dvb_ca_en50221_read_data(struct dvb_ca_private *ca, int slot, u8 * ebuf, int ecount) 591 { 592 int bytes_read; 593 int status; 594 u8 buf[HOST_LINK_BUF_SIZE]; 595 int i; 596 597 dprintk("%s\n", __func__); 598 599 /* check if we have space for a link buf in the rx_buffer */ 600 if (ebuf == NULL) { 601 int buf_free; 602 603 if (ca->slot_info[slot].rx_buffer.data == NULL) { 604 status = -EIO; 605 goto exit; 606 } 607 buf_free = dvb_ringbuffer_free(&ca->slot_info[slot].rx_buffer); 608 609 if (buf_free < (ca->slot_info[slot].link_buf_size + DVB_RINGBUFFER_PKTHDRSIZE)) { 610 status = -EAGAIN; 611 goto exit; 612 } 613 } 614 615 /* check if there is data available */ 616 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS)) < 0) 617 goto exit; 618 if (!(status & STATUSREG_DA)) { 619 /* no data */ 620 status = 0; 621 goto exit; 622 } 623 624 /* read the amount of data */ 625 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_SIZE_HIGH)) < 0) 626 goto exit; 627 bytes_read = status << 8; 628 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_SIZE_LOW)) < 0) 629 goto exit; 630 bytes_read |= status; 631 632 /* check it will fit */ 633 if (ebuf == NULL) { 634 if (bytes_read > ca->slot_info[slot].link_buf_size) { 635 printk("dvb_ca adapter %d: CAM tried to send a buffer larger than the link buffer size (%i > %i)!\n", 636 ca->dvbdev->adapter->num, bytes_read, ca->slot_info[slot].link_buf_size); 637 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_LINKINIT; 638 status = -EIO; 639 goto exit; 640 } 641 if (bytes_read < 2) { 642 printk("dvb_ca adapter %d: CAM sent a buffer that was less than 2 bytes!\n", 643 ca->dvbdev->adapter->num); 644 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_LINKINIT; 645 status = -EIO; 646 goto exit; 647 } 648 } else { 649 if (bytes_read > ecount) { 650 printk("dvb_ca adapter %d: CAM tried to send a buffer larger than the ecount size!\n", 651 ca->dvbdev->adapter->num); 652 status = -EIO; 653 goto exit; 654 } 655 } 656 657 /* fill the buffer */ 658 for (i = 0; i < bytes_read; i++) { 659 /* read byte and check */ 660 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_DATA)) < 0) 661 goto exit; 662 663 /* OK, store it in the buffer */ 664 buf[i] = status; 665 } 666 667 /* check for read error (RE should now be 0) */ 668 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS)) < 0) 669 goto exit; 670 if (status & STATUSREG_RE) { 671 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_LINKINIT; 672 status = -EIO; 673 goto exit; 674 } 675 676 /* OK, add it to the receive buffer, or copy into external buffer if supplied */ 677 if (ebuf == NULL) { 678 if (ca->slot_info[slot].rx_buffer.data == NULL) { 679 status = -EIO; 680 goto exit; 681 } 682 dvb_ringbuffer_pkt_write(&ca->slot_info[slot].rx_buffer, buf, bytes_read); 683 } else { 684 memcpy(ebuf, buf, bytes_read); 685 } 686 687 dprintk("Received CA packet for slot %i connection id 0x%x last_frag:%i size:0x%x\n", slot, 688 buf[0], (buf[1] & 0x80) == 0, bytes_read); 689 690 /* wake up readers when a last_fragment is received */ 691 if ((buf[1] & 0x80) == 0x00) { 692 wake_up_interruptible(&ca->wait_queue); 693 } 694 status = bytes_read; 695 696 exit: 697 return status; 698 } 699 700 701 /** 702 * dvb_ca_en50221_write_data - This function talks to an EN50221 CAM control 703 * interface. It writes a buffer of data to a CAM. 704 * 705 * @ca: CA instance. 706 * @slot: Slot to write to. 707 * @ebuf: The data in this buffer is treated as a complete link-level packet to 708 * be written. 709 * @count: Size of ebuf. 710 * 711 * @return Number of bytes written, or < 0 on error. 712 */ 713 static int dvb_ca_en50221_write_data(struct dvb_ca_private *ca, int slot, u8 * buf, int bytes_write) 714 { 715 int status; 716 int i; 717 718 dprintk("%s\n", __func__); 719 720 721 /* sanity check */ 722 if (bytes_write > ca->slot_info[slot].link_buf_size) 723 return -EINVAL; 724 725 /* it is possible we are dealing with a single buffer implementation, 726 thus if there is data available for read or if there is even a read 727 already in progress, we do nothing but awake the kernel thread to 728 process the data if necessary. */ 729 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS)) < 0) 730 goto exitnowrite; 731 if (status & (STATUSREG_DA | STATUSREG_RE)) { 732 if (status & STATUSREG_DA) 733 dvb_ca_en50221_thread_wakeup(ca); 734 735 status = -EAGAIN; 736 goto exitnowrite; 737 } 738 739 /* OK, set HC bit */ 740 if ((status = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, 741 IRQEN | CMDREG_HC)) != 0) 742 goto exit; 743 744 /* check if interface is still free */ 745 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS)) < 0) 746 goto exit; 747 if (!(status & STATUSREG_FR)) { 748 /* it wasn't free => try again later */ 749 status = -EAGAIN; 750 goto exit; 751 } 752 753 /* send the amount of data */ 754 if ((status = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_SIZE_HIGH, bytes_write >> 8)) != 0) 755 goto exit; 756 if ((status = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_SIZE_LOW, 757 bytes_write & 0xff)) != 0) 758 goto exit; 759 760 /* send the buffer */ 761 for (i = 0; i < bytes_write; i++) { 762 if ((status = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_DATA, buf[i])) != 0) 763 goto exit; 764 } 765 766 /* check for write error (WE should now be 0) */ 767 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS)) < 0) 768 goto exit; 769 if (status & STATUSREG_WE) { 770 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_LINKINIT; 771 status = -EIO; 772 goto exit; 773 } 774 status = bytes_write; 775 776 dprintk("Wrote CA packet for slot %i, connection id 0x%x last_frag:%i size:0x%x\n", slot, 777 buf[0], (buf[1] & 0x80) == 0, bytes_write); 778 779 exit: 780 ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, IRQEN); 781 782 exitnowrite: 783 return status; 784 } 785 EXPORT_SYMBOL(dvb_ca_en50221_camchange_irq); 786 787 788 789 /* ******************************************************************************** */ 790 /* EN50221 higher level functions */ 791 792 793 /** 794 * dvb_ca_en50221_camready_irq - A CAM has been removed => shut it down. 795 * 796 * @ca: CA instance. 797 * @slot: Slot to shut down. 798 */ 799 static int dvb_ca_en50221_slot_shutdown(struct dvb_ca_private *ca, int slot) 800 { 801 dprintk("%s\n", __func__); 802 803 ca->pub->slot_shutdown(ca->pub, slot); 804 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_NONE; 805 806 /* need to wake up all processes to check if they're now 807 trying to write to a defunct CAM */ 808 wake_up_interruptible(&ca->wait_queue); 809 810 dprintk("Slot %i shutdown\n", slot); 811 812 /* success */ 813 return 0; 814 } 815 EXPORT_SYMBOL(dvb_ca_en50221_camready_irq); 816 817 818 /** 819 * dvb_ca_en50221_camready_irq - A CAMCHANGE IRQ has occurred. 820 * 821 * @ca: CA instance. 822 * @slot: Slot concerned. 823 * @change_type: One of the DVB_CA_CAMCHANGE_* values. 824 */ 825 void dvb_ca_en50221_camchange_irq(struct dvb_ca_en50221 *pubca, int slot, int change_type) 826 { 827 struct dvb_ca_private *ca = pubca->private; 828 829 dprintk("CAMCHANGE IRQ slot:%i change_type:%i\n", slot, change_type); 830 831 switch (change_type) { 832 case DVB_CA_EN50221_CAMCHANGE_REMOVED: 833 case DVB_CA_EN50221_CAMCHANGE_INSERTED: 834 break; 835 836 default: 837 return; 838 } 839 840 ca->slot_info[slot].camchange_type = change_type; 841 atomic_inc(&ca->slot_info[slot].camchange_count); 842 dvb_ca_en50221_thread_wakeup(ca); 843 } 844 EXPORT_SYMBOL(dvb_ca_en50221_frda_irq); 845 846 847 /** 848 * dvb_ca_en50221_camready_irq - A CAMREADY IRQ has occurred. 849 * 850 * @ca: CA instance. 851 * @slot: Slot concerned. 852 */ 853 void dvb_ca_en50221_camready_irq(struct dvb_ca_en50221 *pubca, int slot) 854 { 855 struct dvb_ca_private *ca = pubca->private; 856 857 dprintk("CAMREADY IRQ slot:%i\n", slot); 858 859 if (ca->slot_info[slot].slot_state == DVB_CA_SLOTSTATE_WAITREADY) { 860 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_VALIDATE; 861 dvb_ca_en50221_thread_wakeup(ca); 862 } 863 } 864 865 866 /** 867 * An FR or DA IRQ has occurred. 868 * 869 * @ca: CA instance. 870 * @slot: Slot concerned. 871 */ 872 void dvb_ca_en50221_frda_irq(struct dvb_ca_en50221 *pubca, int slot) 873 { 874 struct dvb_ca_private *ca = pubca->private; 875 int flags; 876 877 dprintk("FR/DA IRQ slot:%i\n", slot); 878 879 switch (ca->slot_info[slot].slot_state) { 880 case DVB_CA_SLOTSTATE_LINKINIT: 881 flags = ca->pub->read_cam_control(pubca, slot, CTRLIF_STATUS); 882 if (flags & STATUSREG_DA) { 883 dprintk("CAM supports DA IRQ\n"); 884 ca->slot_info[slot].da_irq_supported = 1; 885 } 886 break; 887 888 case DVB_CA_SLOTSTATE_RUNNING: 889 if (ca->open) 890 dvb_ca_en50221_thread_wakeup(ca); 891 break; 892 } 893 } 894 895 896 897 /* ******************************************************************************** */ 898 /* EN50221 thread functions */ 899 900 /** 901 * Wake up the DVB CA thread 902 * 903 * @ca: CA instance. 904 */ 905 static void dvb_ca_en50221_thread_wakeup(struct dvb_ca_private *ca) 906 { 907 908 dprintk("%s\n", __func__); 909 910 ca->wakeup = 1; 911 mb(); 912 wake_up_process(ca->thread); 913 } 914 915 /** 916 * Update the delay used by the thread. 917 * 918 * @ca: CA instance. 919 */ 920 static void dvb_ca_en50221_thread_update_delay(struct dvb_ca_private *ca) 921 { 922 int delay; 923 int curdelay = 100000000; 924 int slot; 925 926 /* Beware of too high polling frequency, because one polling 927 * call might take several hundred milliseconds until timeout! 928 */ 929 for (slot = 0; slot < ca->slot_count; slot++) { 930 switch (ca->slot_info[slot].slot_state) { 931 default: 932 case DVB_CA_SLOTSTATE_NONE: 933 delay = HZ * 60; /* 60s */ 934 if (!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE)) 935 delay = HZ * 5; /* 5s */ 936 break; 937 case DVB_CA_SLOTSTATE_INVALID: 938 delay = HZ * 60; /* 60s */ 939 if (!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE)) 940 delay = HZ / 10; /* 100ms */ 941 break; 942 943 case DVB_CA_SLOTSTATE_UNINITIALISED: 944 case DVB_CA_SLOTSTATE_WAITREADY: 945 case DVB_CA_SLOTSTATE_VALIDATE: 946 case DVB_CA_SLOTSTATE_WAITFR: 947 case DVB_CA_SLOTSTATE_LINKINIT: 948 delay = HZ / 10; /* 100ms */ 949 break; 950 951 case DVB_CA_SLOTSTATE_RUNNING: 952 delay = HZ * 60; /* 60s */ 953 if (!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE)) 954 delay = HZ / 10; /* 100ms */ 955 if (ca->open) { 956 if ((!ca->slot_info[slot].da_irq_supported) || 957 (!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_DA))) 958 delay = HZ / 10; /* 100ms */ 959 } 960 break; 961 } 962 963 if (delay < curdelay) 964 curdelay = delay; 965 } 966 967 ca->delay = curdelay; 968 } 969 970 971 972 /** 973 * Kernel thread which monitors CA slots for CAM changes, and performs data transfers. 974 */ 975 static int dvb_ca_en50221_thread(void *data) 976 { 977 struct dvb_ca_private *ca = data; 978 int slot; 979 int flags; 980 int status; 981 int pktcount; 982 void *rxbuf; 983 984 dprintk("%s\n", __func__); 985 986 /* choose the correct initial delay */ 987 dvb_ca_en50221_thread_update_delay(ca); 988 989 /* main loop */ 990 while (!kthread_should_stop()) { 991 /* sleep for a bit */ 992 if (!ca->wakeup) { 993 set_current_state(TASK_INTERRUPTIBLE); 994 schedule_timeout(ca->delay); 995 if (kthread_should_stop()) 996 return 0; 997 } 998 ca->wakeup = 0; 999 1000 /* go through all the slots processing them */ 1001 for (slot = 0; slot < ca->slot_count; slot++) { 1002 1003 mutex_lock(&ca->slot_info[slot].slot_lock); 1004 1005 // check the cam status + deal with CAMCHANGEs 1006 while (dvb_ca_en50221_check_camstatus(ca, slot)) { 1007 /* clear down an old CI slot if necessary */ 1008 if (ca->slot_info[slot].slot_state != DVB_CA_SLOTSTATE_NONE) 1009 dvb_ca_en50221_slot_shutdown(ca, slot); 1010 1011 /* if a CAM is NOW present, initialise it */ 1012 if (ca->slot_info[slot].camchange_type == DVB_CA_EN50221_CAMCHANGE_INSERTED) { 1013 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_UNINITIALISED; 1014 } 1015 1016 /* we've handled one CAMCHANGE */ 1017 dvb_ca_en50221_thread_update_delay(ca); 1018 atomic_dec(&ca->slot_info[slot].camchange_count); 1019 } 1020 1021 // CAM state machine 1022 switch (ca->slot_info[slot].slot_state) { 1023 case DVB_CA_SLOTSTATE_NONE: 1024 case DVB_CA_SLOTSTATE_INVALID: 1025 // no action needed 1026 break; 1027 1028 case DVB_CA_SLOTSTATE_UNINITIALISED: 1029 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_WAITREADY; 1030 ca->pub->slot_reset(ca->pub, slot); 1031 ca->slot_info[slot].timeout = jiffies + (INIT_TIMEOUT_SECS * HZ); 1032 break; 1033 1034 case DVB_CA_SLOTSTATE_WAITREADY: 1035 if (time_after(jiffies, ca->slot_info[slot].timeout)) { 1036 printk("dvb_ca adaptor %d: PC card did not respond :(\n", 1037 ca->dvbdev->adapter->num); 1038 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID; 1039 dvb_ca_en50221_thread_update_delay(ca); 1040 break; 1041 } 1042 // no other action needed; will automatically change state when ready 1043 break; 1044 1045 case DVB_CA_SLOTSTATE_VALIDATE: 1046 if (dvb_ca_en50221_parse_attributes(ca, slot) != 0) { 1047 /* we need this extra check for annoying interfaces like the budget-av */ 1048 if ((!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE)) && 1049 (ca->pub->poll_slot_status)) { 1050 status = ca->pub->poll_slot_status(ca->pub, slot, 0); 1051 if (!(status & DVB_CA_EN50221_POLL_CAM_PRESENT)) { 1052 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_NONE; 1053 dvb_ca_en50221_thread_update_delay(ca); 1054 break; 1055 } 1056 } 1057 1058 printk("dvb_ca adapter %d: Invalid PC card inserted :(\n", 1059 ca->dvbdev->adapter->num); 1060 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID; 1061 dvb_ca_en50221_thread_update_delay(ca); 1062 break; 1063 } 1064 if (dvb_ca_en50221_set_configoption(ca, slot) != 0) { 1065 printk("dvb_ca adapter %d: Unable to initialise CAM :(\n", 1066 ca->dvbdev->adapter->num); 1067 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID; 1068 dvb_ca_en50221_thread_update_delay(ca); 1069 break; 1070 } 1071 if (ca->pub->write_cam_control(ca->pub, slot, 1072 CTRLIF_COMMAND, CMDREG_RS) != 0) { 1073 printk("dvb_ca adapter %d: Unable to reset CAM IF\n", 1074 ca->dvbdev->adapter->num); 1075 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID; 1076 dvb_ca_en50221_thread_update_delay(ca); 1077 break; 1078 } 1079 dprintk("DVB CAM validated successfully\n"); 1080 1081 ca->slot_info[slot].timeout = jiffies + (INIT_TIMEOUT_SECS * HZ); 1082 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_WAITFR; 1083 ca->wakeup = 1; 1084 break; 1085 1086 case DVB_CA_SLOTSTATE_WAITFR: 1087 if (time_after(jiffies, ca->slot_info[slot].timeout)) { 1088 printk("dvb_ca adapter %d: DVB CAM did not respond :(\n", 1089 ca->dvbdev->adapter->num); 1090 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID; 1091 dvb_ca_en50221_thread_update_delay(ca); 1092 break; 1093 } 1094 1095 flags = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS); 1096 if (flags & STATUSREG_FR) { 1097 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_LINKINIT; 1098 ca->wakeup = 1; 1099 } 1100 break; 1101 1102 case DVB_CA_SLOTSTATE_LINKINIT: 1103 if (dvb_ca_en50221_link_init(ca, slot) != 0) { 1104 /* we need this extra check for annoying interfaces like the budget-av */ 1105 if ((!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE)) && 1106 (ca->pub->poll_slot_status)) { 1107 status = ca->pub->poll_slot_status(ca->pub, slot, 0); 1108 if (!(status & DVB_CA_EN50221_POLL_CAM_PRESENT)) { 1109 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_NONE; 1110 dvb_ca_en50221_thread_update_delay(ca); 1111 break; 1112 } 1113 } 1114 1115 printk("dvb_ca adapter %d: DVB CAM link initialisation failed :(\n", ca->dvbdev->adapter->num); 1116 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID; 1117 dvb_ca_en50221_thread_update_delay(ca); 1118 break; 1119 } 1120 1121 if (ca->slot_info[slot].rx_buffer.data == NULL) { 1122 rxbuf = vmalloc(RX_BUFFER_SIZE); 1123 if (rxbuf == NULL) { 1124 printk("dvb_ca adapter %d: Unable to allocate CAM rx buffer :(\n", ca->dvbdev->adapter->num); 1125 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID; 1126 dvb_ca_en50221_thread_update_delay(ca); 1127 break; 1128 } 1129 dvb_ringbuffer_init(&ca->slot_info[slot].rx_buffer, rxbuf, RX_BUFFER_SIZE); 1130 } 1131 1132 ca->pub->slot_ts_enable(ca->pub, slot); 1133 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_RUNNING; 1134 dvb_ca_en50221_thread_update_delay(ca); 1135 printk("dvb_ca adapter %d: DVB CAM detected and initialised successfully\n", ca->dvbdev->adapter->num); 1136 break; 1137 1138 case DVB_CA_SLOTSTATE_RUNNING: 1139 if (!ca->open) 1140 break; 1141 1142 // poll slots for data 1143 pktcount = 0; 1144 while ((status = dvb_ca_en50221_read_data(ca, slot, NULL, 0)) > 0) { 1145 if (!ca->open) 1146 break; 1147 1148 /* if a CAMCHANGE occurred at some point, do not do any more processing of this slot */ 1149 if (dvb_ca_en50221_check_camstatus(ca, slot)) { 1150 // we dont want to sleep on the next iteration so we can handle the cam change 1151 ca->wakeup = 1; 1152 break; 1153 } 1154 1155 /* check if we've hit our limit this time */ 1156 if (++pktcount >= MAX_RX_PACKETS_PER_ITERATION) { 1157 // dont sleep; there is likely to be more data to read 1158 ca->wakeup = 1; 1159 break; 1160 } 1161 } 1162 break; 1163 } 1164 1165 mutex_unlock(&ca->slot_info[slot].slot_lock); 1166 } 1167 } 1168 1169 return 0; 1170 } 1171 1172 1173 1174 /* ******************************************************************************** */ 1175 /* EN50221 IO interface functions */ 1176 1177 /** 1178 * Real ioctl implementation. 1179 * NOTE: CA_SEND_MSG/CA_GET_MSG ioctls have userspace buffers passed to them. 1180 * 1181 * @inode: Inode concerned. 1182 * @file: File concerned. 1183 * @cmd: IOCTL command. 1184 * @arg: Associated argument. 1185 * 1186 * @return 0 on success, <0 on error. 1187 */ 1188 static int dvb_ca_en50221_io_do_ioctl(struct file *file, 1189 unsigned int cmd, void *parg) 1190 { 1191 struct dvb_device *dvbdev = file->private_data; 1192 struct dvb_ca_private *ca = dvbdev->priv; 1193 int err = 0; 1194 int slot; 1195 1196 dprintk("%s\n", __func__); 1197 1198 if (mutex_lock_interruptible(&ca->ioctl_mutex)) 1199 return -ERESTARTSYS; 1200 1201 switch (cmd) { 1202 case CA_RESET: 1203 for (slot = 0; slot < ca->slot_count; slot++) { 1204 mutex_lock(&ca->slot_info[slot].slot_lock); 1205 if (ca->slot_info[slot].slot_state != DVB_CA_SLOTSTATE_NONE) { 1206 dvb_ca_en50221_slot_shutdown(ca, slot); 1207 if (ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE) 1208 dvb_ca_en50221_camchange_irq(ca->pub, 1209 slot, 1210 DVB_CA_EN50221_CAMCHANGE_INSERTED); 1211 } 1212 mutex_unlock(&ca->slot_info[slot].slot_lock); 1213 } 1214 ca->next_read_slot = 0; 1215 dvb_ca_en50221_thread_wakeup(ca); 1216 break; 1217 1218 case CA_GET_CAP: { 1219 struct ca_caps *caps = parg; 1220 1221 caps->slot_num = ca->slot_count; 1222 caps->slot_type = CA_CI_LINK; 1223 caps->descr_num = 0; 1224 caps->descr_type = 0; 1225 break; 1226 } 1227 1228 case CA_GET_SLOT_INFO: { 1229 struct ca_slot_info *info = parg; 1230 1231 if ((info->num > ca->slot_count) || (info->num < 0)) { 1232 err = -EINVAL; 1233 goto out_unlock; 1234 } 1235 1236 info->type = CA_CI_LINK; 1237 info->flags = 0; 1238 if ((ca->slot_info[info->num].slot_state != DVB_CA_SLOTSTATE_NONE) 1239 && (ca->slot_info[info->num].slot_state != DVB_CA_SLOTSTATE_INVALID)) { 1240 info->flags = CA_CI_MODULE_PRESENT; 1241 } 1242 if (ca->slot_info[info->num].slot_state == DVB_CA_SLOTSTATE_RUNNING) { 1243 info->flags |= CA_CI_MODULE_READY; 1244 } 1245 break; 1246 } 1247 1248 default: 1249 err = -EINVAL; 1250 break; 1251 } 1252 1253 out_unlock: 1254 mutex_unlock(&ca->ioctl_mutex); 1255 return err; 1256 } 1257 1258 1259 /** 1260 * Wrapper for ioctl implementation. 1261 * 1262 * @inode: Inode concerned. 1263 * @file: File concerned. 1264 * @cmd: IOCTL command. 1265 * @arg: Associated argument. 1266 * 1267 * @return 0 on success, <0 on error. 1268 */ 1269 static long dvb_ca_en50221_io_ioctl(struct file *file, 1270 unsigned int cmd, unsigned long arg) 1271 { 1272 return dvb_usercopy(file, cmd, arg, dvb_ca_en50221_io_do_ioctl); 1273 } 1274 1275 1276 /** 1277 * Implementation of write() syscall. 1278 * 1279 * @file: File structure. 1280 * @buf: Source buffer. 1281 * @count: Size of source buffer. 1282 * @ppos: Position in file (ignored). 1283 * 1284 * @return Number of bytes read, or <0 on error. 1285 */ 1286 static ssize_t dvb_ca_en50221_io_write(struct file *file, 1287 const char __user * buf, size_t count, loff_t * ppos) 1288 { 1289 struct dvb_device *dvbdev = file->private_data; 1290 struct dvb_ca_private *ca = dvbdev->priv; 1291 u8 slot, connection_id; 1292 int status; 1293 u8 fragbuf[HOST_LINK_BUF_SIZE]; 1294 int fragpos = 0; 1295 int fraglen; 1296 unsigned long timeout; 1297 int written; 1298 1299 dprintk("%s\n", __func__); 1300 1301 /* Incoming packet has a 2 byte header. hdr[0] = slot_id, hdr[1] = connection_id */ 1302 if (count < 2) 1303 return -EINVAL; 1304 1305 /* extract slot & connection id */ 1306 if (copy_from_user(&slot, buf, 1)) 1307 return -EFAULT; 1308 if (copy_from_user(&connection_id, buf + 1, 1)) 1309 return -EFAULT; 1310 buf += 2; 1311 count -= 2; 1312 1313 /* check if the slot is actually running */ 1314 if (ca->slot_info[slot].slot_state != DVB_CA_SLOTSTATE_RUNNING) 1315 return -EINVAL; 1316 1317 /* fragment the packets & store in the buffer */ 1318 while (fragpos < count) { 1319 fraglen = ca->slot_info[slot].link_buf_size - 2; 1320 if (fraglen < 0) 1321 break; 1322 if (fraglen > HOST_LINK_BUF_SIZE - 2) 1323 fraglen = HOST_LINK_BUF_SIZE - 2; 1324 if ((count - fragpos) < fraglen) 1325 fraglen = count - fragpos; 1326 1327 fragbuf[0] = connection_id; 1328 fragbuf[1] = ((fragpos + fraglen) < count) ? 0x80 : 0x00; 1329 status = copy_from_user(fragbuf + 2, buf + fragpos, fraglen); 1330 if (status) { 1331 status = -EFAULT; 1332 goto exit; 1333 } 1334 1335 timeout = jiffies + HZ / 2; 1336 written = 0; 1337 while (!time_after(jiffies, timeout)) { 1338 /* check the CAM hasn't been removed/reset in the meantime */ 1339 if (ca->slot_info[slot].slot_state != DVB_CA_SLOTSTATE_RUNNING) { 1340 status = -EIO; 1341 goto exit; 1342 } 1343 1344 mutex_lock(&ca->slot_info[slot].slot_lock); 1345 status = dvb_ca_en50221_write_data(ca, slot, fragbuf, fraglen + 2); 1346 mutex_unlock(&ca->slot_info[slot].slot_lock); 1347 if (status == (fraglen + 2)) { 1348 written = 1; 1349 break; 1350 } 1351 if (status != -EAGAIN) 1352 goto exit; 1353 1354 msleep(1); 1355 } 1356 if (!written) { 1357 status = -EIO; 1358 goto exit; 1359 } 1360 1361 fragpos += fraglen; 1362 } 1363 status = count + 2; 1364 1365 exit: 1366 return status; 1367 } 1368 1369 1370 /** 1371 * Condition for waking up in dvb_ca_en50221_io_read_condition 1372 */ 1373 static int dvb_ca_en50221_io_read_condition(struct dvb_ca_private *ca, 1374 int *result, int *_slot) 1375 { 1376 int slot; 1377 int slot_count = 0; 1378 int idx; 1379 size_t fraglen; 1380 int connection_id = -1; 1381 int found = 0; 1382 u8 hdr[2]; 1383 1384 slot = ca->next_read_slot; 1385 while ((slot_count < ca->slot_count) && (!found)) { 1386 if (ca->slot_info[slot].slot_state != DVB_CA_SLOTSTATE_RUNNING) 1387 goto nextslot; 1388 1389 if (ca->slot_info[slot].rx_buffer.data == NULL) { 1390 return 0; 1391 } 1392 1393 idx = dvb_ringbuffer_pkt_next(&ca->slot_info[slot].rx_buffer, -1, &fraglen); 1394 while (idx != -1) { 1395 dvb_ringbuffer_pkt_read(&ca->slot_info[slot].rx_buffer, idx, 0, hdr, 2); 1396 if (connection_id == -1) 1397 connection_id = hdr[0]; 1398 if ((hdr[0] == connection_id) && ((hdr[1] & 0x80) == 0)) { 1399 *_slot = slot; 1400 found = 1; 1401 break; 1402 } 1403 1404 idx = dvb_ringbuffer_pkt_next(&ca->slot_info[slot].rx_buffer, idx, &fraglen); 1405 } 1406 1407 nextslot: 1408 slot = (slot + 1) % ca->slot_count; 1409 slot_count++; 1410 } 1411 1412 ca->next_read_slot = slot; 1413 return found; 1414 } 1415 1416 1417 /** 1418 * Implementation of read() syscall. 1419 * 1420 * @file: File structure. 1421 * @buf: Destination buffer. 1422 * @count: Size of destination buffer. 1423 * @ppos: Position in file (ignored). 1424 * 1425 * @return Number of bytes read, or <0 on error. 1426 */ 1427 static ssize_t dvb_ca_en50221_io_read(struct file *file, char __user * buf, 1428 size_t count, loff_t * ppos) 1429 { 1430 struct dvb_device *dvbdev = file->private_data; 1431 struct dvb_ca_private *ca = dvbdev->priv; 1432 int status; 1433 int result = 0; 1434 u8 hdr[2]; 1435 int slot; 1436 int connection_id = -1; 1437 size_t idx, idx2; 1438 int last_fragment = 0; 1439 size_t fraglen; 1440 int pktlen; 1441 int dispose = 0; 1442 1443 dprintk("%s\n", __func__); 1444 1445 /* Outgoing packet has a 2 byte header. hdr[0] = slot_id, hdr[1] = connection_id */ 1446 if (count < 2) 1447 return -EINVAL; 1448 1449 /* wait for some data */ 1450 if ((status = dvb_ca_en50221_io_read_condition(ca, &result, &slot)) == 0) { 1451 1452 /* if we're in nonblocking mode, exit immediately */ 1453 if (file->f_flags & O_NONBLOCK) 1454 return -EWOULDBLOCK; 1455 1456 /* wait for some data */ 1457 status = wait_event_interruptible(ca->wait_queue, 1458 dvb_ca_en50221_io_read_condition 1459 (ca, &result, &slot)); 1460 } 1461 if ((status < 0) || (result < 0)) { 1462 if (result) 1463 return result; 1464 return status; 1465 } 1466 1467 idx = dvb_ringbuffer_pkt_next(&ca->slot_info[slot].rx_buffer, -1, &fraglen); 1468 pktlen = 2; 1469 do { 1470 if (idx == -1) { 1471 printk("dvb_ca adapter %d: BUG: read packet ended before last_fragment encountered\n", ca->dvbdev->adapter->num); 1472 status = -EIO; 1473 goto exit; 1474 } 1475 1476 dvb_ringbuffer_pkt_read(&ca->slot_info[slot].rx_buffer, idx, 0, hdr, 2); 1477 if (connection_id == -1) 1478 connection_id = hdr[0]; 1479 if (hdr[0] == connection_id) { 1480 if (pktlen < count) { 1481 if ((pktlen + fraglen - 2) > count) { 1482 fraglen = count - pktlen; 1483 } else { 1484 fraglen -= 2; 1485 } 1486 1487 if ((status = dvb_ringbuffer_pkt_read_user(&ca->slot_info[slot].rx_buffer, idx, 2, 1488 buf + pktlen, fraglen)) < 0) { 1489 goto exit; 1490 } 1491 pktlen += fraglen; 1492 } 1493 1494 if ((hdr[1] & 0x80) == 0) 1495 last_fragment = 1; 1496 dispose = 1; 1497 } 1498 1499 idx2 = dvb_ringbuffer_pkt_next(&ca->slot_info[slot].rx_buffer, idx, &fraglen); 1500 if (dispose) 1501 dvb_ringbuffer_pkt_dispose(&ca->slot_info[slot].rx_buffer, idx); 1502 idx = idx2; 1503 dispose = 0; 1504 } while (!last_fragment); 1505 1506 hdr[0] = slot; 1507 hdr[1] = connection_id; 1508 status = copy_to_user(buf, hdr, 2); 1509 if (status) { 1510 status = -EFAULT; 1511 goto exit; 1512 } 1513 status = pktlen; 1514 1515 exit: 1516 return status; 1517 } 1518 1519 1520 /** 1521 * Implementation of file open syscall. 1522 * 1523 * @inode: Inode concerned. 1524 * @file: File concerned. 1525 * 1526 * @return 0 on success, <0 on failure. 1527 */ 1528 static int dvb_ca_en50221_io_open(struct inode *inode, struct file *file) 1529 { 1530 struct dvb_device *dvbdev = file->private_data; 1531 struct dvb_ca_private *ca = dvbdev->priv; 1532 int err; 1533 int i; 1534 1535 dprintk("%s\n", __func__); 1536 1537 if (!try_module_get(ca->pub->owner)) 1538 return -EIO; 1539 1540 err = dvb_generic_open(inode, file); 1541 if (err < 0) { 1542 module_put(ca->pub->owner); 1543 return err; 1544 } 1545 1546 for (i = 0; i < ca->slot_count; i++) { 1547 1548 if (ca->slot_info[i].slot_state == DVB_CA_SLOTSTATE_RUNNING) { 1549 if (ca->slot_info[i].rx_buffer.data != NULL) { 1550 /* it is safe to call this here without locks because 1551 * ca->open == 0. Data is not read in this case */ 1552 dvb_ringbuffer_flush(&ca->slot_info[i].rx_buffer); 1553 } 1554 } 1555 } 1556 1557 ca->open = 1; 1558 dvb_ca_en50221_thread_update_delay(ca); 1559 dvb_ca_en50221_thread_wakeup(ca); 1560 1561 return 0; 1562 } 1563 1564 1565 /** 1566 * Implementation of file close syscall. 1567 * 1568 * @inode: Inode concerned. 1569 * @file: File concerned. 1570 * 1571 * @return 0 on success, <0 on failure. 1572 */ 1573 static int dvb_ca_en50221_io_release(struct inode *inode, struct file *file) 1574 { 1575 struct dvb_device *dvbdev = file->private_data; 1576 struct dvb_ca_private *ca = dvbdev->priv; 1577 int err; 1578 1579 dprintk("%s\n", __func__); 1580 1581 /* mark the CA device as closed */ 1582 ca->open = 0; 1583 dvb_ca_en50221_thread_update_delay(ca); 1584 1585 err = dvb_generic_release(inode, file); 1586 1587 module_put(ca->pub->owner); 1588 1589 return err; 1590 } 1591 1592 1593 /** 1594 * Implementation of poll() syscall. 1595 * 1596 * @file: File concerned. 1597 * @wait: poll wait table. 1598 * 1599 * @return Standard poll mask. 1600 */ 1601 static unsigned int dvb_ca_en50221_io_poll(struct file *file, poll_table * wait) 1602 { 1603 struct dvb_device *dvbdev = file->private_data; 1604 struct dvb_ca_private *ca = dvbdev->priv; 1605 unsigned int mask = 0; 1606 int slot; 1607 int result = 0; 1608 1609 dprintk("%s\n", __func__); 1610 1611 if (dvb_ca_en50221_io_read_condition(ca, &result, &slot) == 1) { 1612 mask |= POLLIN; 1613 } 1614 1615 /* if there is something, return now */ 1616 if (mask) 1617 return mask; 1618 1619 /* wait for something to happen */ 1620 poll_wait(file, &ca->wait_queue, wait); 1621 1622 if (dvb_ca_en50221_io_read_condition(ca, &result, &slot) == 1) { 1623 mask |= POLLIN; 1624 } 1625 1626 return mask; 1627 } 1628 EXPORT_SYMBOL(dvb_ca_en50221_init); 1629 1630 1631 static const struct file_operations dvb_ca_fops = { 1632 .owner = THIS_MODULE, 1633 .read = dvb_ca_en50221_io_read, 1634 .write = dvb_ca_en50221_io_write, 1635 .unlocked_ioctl = dvb_ca_en50221_io_ioctl, 1636 .open = dvb_ca_en50221_io_open, 1637 .release = dvb_ca_en50221_io_release, 1638 .poll = dvb_ca_en50221_io_poll, 1639 .llseek = noop_llseek, 1640 }; 1641 1642 static const struct dvb_device dvbdev_ca = { 1643 .priv = NULL, 1644 .users = 1, 1645 .readers = 1, 1646 .writers = 1, 1647 #if defined(CONFIG_MEDIA_CONTROLLER_DVB) 1648 .name = "dvb-ca-en50221", 1649 #endif 1650 .fops = &dvb_ca_fops, 1651 }; 1652 1653 /* ******************************************************************************** */ 1654 /* Initialisation/shutdown functions */ 1655 1656 1657 /** 1658 * Initialise a new DVB CA EN50221 interface device. 1659 * 1660 * @dvb_adapter: DVB adapter to attach the new CA device to. 1661 * @ca: The dvb_ca instance. 1662 * @flags: Flags describing the CA device (DVB_CA_FLAG_*). 1663 * @slot_count: Number of slots supported. 1664 * 1665 * @return 0 on success, nonzero on failure 1666 */ 1667 int dvb_ca_en50221_init(struct dvb_adapter *dvb_adapter, 1668 struct dvb_ca_en50221 *pubca, int flags, int slot_count) 1669 { 1670 int ret; 1671 struct dvb_ca_private *ca = NULL; 1672 int i; 1673 1674 dprintk("%s\n", __func__); 1675 1676 if (slot_count < 1) 1677 return -EINVAL; 1678 1679 /* initialise the system data */ 1680 if ((ca = kzalloc(sizeof(struct dvb_ca_private), GFP_KERNEL)) == NULL) { 1681 ret = -ENOMEM; 1682 goto exit; 1683 } 1684 ca->pub = pubca; 1685 ca->flags = flags; 1686 ca->slot_count = slot_count; 1687 if ((ca->slot_info = kcalloc(slot_count, sizeof(struct dvb_ca_slot), GFP_KERNEL)) == NULL) { 1688 ret = -ENOMEM; 1689 goto free_ca; 1690 } 1691 init_waitqueue_head(&ca->wait_queue); 1692 ca->open = 0; 1693 ca->wakeup = 0; 1694 ca->next_read_slot = 0; 1695 pubca->private = ca; 1696 1697 /* register the DVB device */ 1698 ret = dvb_register_device(dvb_adapter, &ca->dvbdev, &dvbdev_ca, ca, DVB_DEVICE_CA); 1699 if (ret) 1700 goto free_slot_info; 1701 1702 /* now initialise each slot */ 1703 for (i = 0; i < slot_count; i++) { 1704 memset(&ca->slot_info[i], 0, sizeof(struct dvb_ca_slot)); 1705 ca->slot_info[i].slot_state = DVB_CA_SLOTSTATE_NONE; 1706 atomic_set(&ca->slot_info[i].camchange_count, 0); 1707 ca->slot_info[i].camchange_type = DVB_CA_EN50221_CAMCHANGE_REMOVED; 1708 mutex_init(&ca->slot_info[i].slot_lock); 1709 } 1710 1711 mutex_init(&ca->ioctl_mutex); 1712 1713 if (signal_pending(current)) { 1714 ret = -EINTR; 1715 goto unregister_device; 1716 } 1717 mb(); 1718 1719 /* create a kthread for monitoring this CA device */ 1720 ca->thread = kthread_run(dvb_ca_en50221_thread, ca, "kdvb-ca-%i:%i", 1721 ca->dvbdev->adapter->num, ca->dvbdev->id); 1722 if (IS_ERR(ca->thread)) { 1723 ret = PTR_ERR(ca->thread); 1724 printk("dvb_ca_init: failed to start kernel_thread (%d)\n", 1725 ret); 1726 goto unregister_device; 1727 } 1728 return 0; 1729 1730 unregister_device: 1731 dvb_unregister_device(ca->dvbdev); 1732 free_slot_info: 1733 kfree(ca->slot_info); 1734 free_ca: 1735 kfree(ca); 1736 exit: 1737 pubca->private = NULL; 1738 return ret; 1739 } 1740 EXPORT_SYMBOL(dvb_ca_en50221_release); 1741 1742 1743 1744 /** 1745 * Release a DVB CA EN50221 interface device. 1746 * 1747 * @ca_dev: The dvb_device_t instance for the CA device. 1748 * @ca: The associated dvb_ca instance. 1749 */ 1750 void dvb_ca_en50221_release(struct dvb_ca_en50221 *pubca) 1751 { 1752 struct dvb_ca_private *ca = pubca->private; 1753 int i; 1754 1755 dprintk("%s\n", __func__); 1756 1757 /* shutdown the thread if there was one */ 1758 kthread_stop(ca->thread); 1759 1760 for (i = 0; i < ca->slot_count; i++) { 1761 dvb_ca_en50221_slot_shutdown(ca, i); 1762 vfree(ca->slot_info[i].rx_buffer.data); 1763 } 1764 kfree(ca->slot_info); 1765 dvb_unregister_device(ca->dvbdev); 1766 kfree(ca); 1767 pubca->private = NULL; 1768 } 1769