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 * To obtain the license, point your browser to 25 * http://www.gnu.org/copyleft/gpl.html 26 */ 27 28 #define pr_fmt(fmt) "dvb_ca_en50221: " fmt 29 30 #include <linux/errno.h> 31 #include <linux/slab.h> 32 #include <linux/list.h> 33 #include <linux/module.h> 34 #include <linux/nospec.h> 35 #include <linux/vmalloc.h> 36 #include <linux/delay.h> 37 #include <linux/spinlock.h> 38 #include <linux/sched/signal.h> 39 #include <linux/kthread.h> 40 41 #include <media/dvb_ca_en50221.h> 42 #include <media/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(fmt, arg...) do { \ 50 if (dvb_ca_en50221_debug) \ 51 printk(KERN_DEBUG pr_fmt("%s: " fmt), __func__, ##arg);\ 52 } while (0) 53 54 #define INIT_TIMEOUT_SECS 10 55 56 #define HOST_LINK_BUF_SIZE 0x200 57 58 #define RX_BUFFER_SIZE 65535 59 60 #define MAX_RX_PACKETS_PER_ITERATION 10 61 62 #define CTRLIF_DATA 0 63 #define CTRLIF_COMMAND 1 64 #define CTRLIF_STATUS 1 65 #define CTRLIF_SIZE_LOW 2 66 #define CTRLIF_SIZE_HIGH 3 67 68 #define CMDREG_HC 1 /* Host control */ 69 #define CMDREG_SW 2 /* Size write */ 70 #define CMDREG_SR 4 /* Size read */ 71 #define CMDREG_RS 8 /* Reset interface */ 72 #define CMDREG_FRIE 0x40 /* Enable FR interrupt */ 73 #define CMDREG_DAIE 0x80 /* Enable DA interrupt */ 74 #define IRQEN (CMDREG_DAIE) 75 76 #define STATUSREG_RE 1 /* read error */ 77 #define STATUSREG_WE 2 /* write error */ 78 #define STATUSREG_FR 0x40 /* module free */ 79 #define STATUSREG_DA 0x80 /* data available */ 80 81 #define DVB_CA_SLOTSTATE_NONE 0 82 #define DVB_CA_SLOTSTATE_UNINITIALISED 1 83 #define DVB_CA_SLOTSTATE_RUNNING 2 84 #define DVB_CA_SLOTSTATE_INVALID 3 85 #define DVB_CA_SLOTSTATE_WAITREADY 4 86 #define DVB_CA_SLOTSTATE_VALIDATE 5 87 #define DVB_CA_SLOTSTATE_WAITFR 6 88 #define DVB_CA_SLOTSTATE_LINKINIT 7 89 90 /* Information on a CA slot */ 91 struct dvb_ca_slot { 92 /* current state of the CAM */ 93 int slot_state; 94 95 /* mutex used for serializing access to one CI slot */ 96 struct mutex slot_lock; 97 98 /* Number of CAMCHANGES that have occurred since last processing */ 99 atomic_t camchange_count; 100 101 /* Type of last CAMCHANGE */ 102 int camchange_type; 103 104 /* base address of CAM config */ 105 u32 config_base; 106 107 /* value to write into Config Control register */ 108 u8 config_option; 109 110 /* if 1, the CAM supports DA IRQs */ 111 u8 da_irq_supported:1; 112 113 /* size of the buffer to use when talking to the CAM */ 114 int link_buf_size; 115 116 /* buffer for incoming packets */ 117 struct dvb_ringbuffer rx_buffer; 118 119 /* timer used during various states of the slot */ 120 unsigned long timeout; 121 }; 122 123 /* Private CA-interface information */ 124 struct dvb_ca_private { 125 struct kref refcount; 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 /* 158 * Slot to start looking for data to read from in the next user-space 159 * read operation 160 */ 161 int next_read_slot; 162 163 /* mutex serializing ioctls */ 164 struct mutex ioctl_mutex; 165 }; 166 167 static void dvb_ca_private_free(struct dvb_ca_private *ca) 168 { 169 unsigned int i; 170 171 dvb_free_device(ca->dvbdev); 172 for (i = 0; i < ca->slot_count; i++) 173 vfree(ca->slot_info[i].rx_buffer.data); 174 175 kfree(ca->slot_info); 176 kfree(ca); 177 } 178 179 static void dvb_ca_private_release(struct kref *ref) 180 { 181 struct dvb_ca_private *ca; 182 183 ca = container_of(ref, struct dvb_ca_private, refcount); 184 dvb_ca_private_free(ca); 185 } 186 187 static void dvb_ca_private_get(struct dvb_ca_private *ca) 188 { 189 kref_get(&ca->refcount); 190 } 191 192 static void dvb_ca_private_put(struct dvb_ca_private *ca) 193 { 194 kref_put(&ca->refcount, dvb_ca_private_release); 195 } 196 197 static void dvb_ca_en50221_thread_wakeup(struct dvb_ca_private *ca); 198 static int dvb_ca_en50221_read_data(struct dvb_ca_private *ca, int slot, 199 u8 *ebuf, int ecount); 200 static int dvb_ca_en50221_write_data(struct dvb_ca_private *ca, int slot, 201 u8 *ebuf, int ecount); 202 203 /** 204 * Safely find needle in haystack. 205 * 206 * @haystack: Buffer to look in. 207 * @hlen: Number of bytes in haystack. 208 * @needle: Buffer to find. 209 * @nlen: Number of bytes in needle. 210 * return: Pointer into haystack needle was found at, or NULL if not found. 211 */ 212 static char *findstr(char *haystack, int hlen, char *needle, int nlen) 213 { 214 int i; 215 216 if (hlen < nlen) 217 return NULL; 218 219 for (i = 0; i <= hlen - nlen; i++) { 220 if (!strncmp(haystack + i, needle, nlen)) 221 return haystack + i; 222 } 223 224 return NULL; 225 } 226 227 /* ************************************************************************** */ 228 /* EN50221 physical interface functions */ 229 230 /* 231 * dvb_ca_en50221_check_camstatus - Check CAM status. 232 */ 233 static int dvb_ca_en50221_check_camstatus(struct dvb_ca_private *ca, int slot) 234 { 235 struct dvb_ca_slot *sl = &ca->slot_info[slot]; 236 int slot_status; 237 int cam_present_now; 238 int cam_changed; 239 240 /* IRQ mode */ 241 if (ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE) 242 return (atomic_read(&sl->camchange_count) != 0); 243 244 /* poll mode */ 245 slot_status = ca->pub->poll_slot_status(ca->pub, slot, ca->open); 246 247 cam_present_now = (slot_status & DVB_CA_EN50221_POLL_CAM_PRESENT) ? 1 : 0; 248 cam_changed = (slot_status & DVB_CA_EN50221_POLL_CAM_CHANGED) ? 1 : 0; 249 if (!cam_changed) { 250 int cam_present_old = (sl->slot_state != DVB_CA_SLOTSTATE_NONE); 251 252 cam_changed = (cam_present_now != cam_present_old); 253 } 254 255 if (cam_changed) { 256 if (!cam_present_now) 257 sl->camchange_type = DVB_CA_EN50221_CAMCHANGE_REMOVED; 258 else 259 sl->camchange_type = DVB_CA_EN50221_CAMCHANGE_INSERTED; 260 atomic_set(&sl->camchange_count, 1); 261 } else { 262 if ((sl->slot_state == DVB_CA_SLOTSTATE_WAITREADY) && 263 (slot_status & DVB_CA_EN50221_POLL_CAM_READY)) { 264 /* move to validate state if reset is completed */ 265 sl->slot_state = DVB_CA_SLOTSTATE_VALIDATE; 266 } 267 } 268 269 return cam_changed; 270 } 271 272 /** 273 * dvb_ca_en50221_wait_if_status - Wait for flags to become set on the STATUS 274 * register on a CAM interface, checking for errors and timeout. 275 * 276 * @ca: CA instance. 277 * @slot: Slot on interface. 278 * @waitfor: Flags to wait for. 279 * @timeout_hz: Timeout in milliseconds. 280 * 281 * return: 0 on success, nonzero on error. 282 */ 283 static int dvb_ca_en50221_wait_if_status(struct dvb_ca_private *ca, int slot, 284 u8 waitfor, int timeout_hz) 285 { 286 unsigned long timeout; 287 unsigned long start; 288 289 dprintk("%s\n", __func__); 290 291 /* loop until timeout elapsed */ 292 start = jiffies; 293 timeout = jiffies + timeout_hz; 294 while (1) { 295 int res; 296 297 /* read the status and check for error */ 298 res = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS); 299 if (res < 0) 300 return -EIO; 301 302 /* if we got the flags, it was successful! */ 303 if (res & waitfor) { 304 dprintk("%s succeeded timeout:%lu\n", 305 __func__, jiffies - start); 306 return 0; 307 } 308 309 /* check for timeout */ 310 if (time_after(jiffies, timeout)) 311 break; 312 313 /* wait for a bit */ 314 usleep_range(1000, 1100); 315 } 316 317 dprintk("%s failed timeout:%lu\n", __func__, jiffies - start); 318 319 /* if we get here, we've timed out */ 320 return -ETIMEDOUT; 321 } 322 323 /** 324 * dvb_ca_en50221_link_init - Initialise the link layer connection to a CAM. 325 * 326 * @ca: CA instance. 327 * @slot: Slot id. 328 * 329 * return: 0 on success, nonzero on failure. 330 */ 331 static int dvb_ca_en50221_link_init(struct dvb_ca_private *ca, int slot) 332 { 333 struct dvb_ca_slot *sl = &ca->slot_info[slot]; 334 int ret; 335 int buf_size; 336 u8 buf[2]; 337 338 dprintk("%s\n", __func__); 339 340 /* we'll be determining these during this function */ 341 sl->da_irq_supported = 0; 342 343 /* 344 * set the host link buffer size temporarily. it will be overwritten 345 * with the real negotiated size later. 346 */ 347 sl->link_buf_size = 2; 348 349 /* read the buffer size from the CAM */ 350 ret = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, 351 IRQEN | CMDREG_SR); 352 if (ret) 353 return ret; 354 ret = dvb_ca_en50221_wait_if_status(ca, slot, STATUSREG_DA, HZ); 355 if (ret) 356 return ret; 357 ret = dvb_ca_en50221_read_data(ca, slot, buf, 2); 358 if (ret != 2) 359 return -EIO; 360 ret = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, IRQEN); 361 if (ret) 362 return ret; 363 364 /* 365 * store it, and choose the minimum of our buffer and the CAM's buffer 366 * size 367 */ 368 buf_size = (buf[0] << 8) | buf[1]; 369 if (buf_size > HOST_LINK_BUF_SIZE) 370 buf_size = HOST_LINK_BUF_SIZE; 371 sl->link_buf_size = buf_size; 372 buf[0] = buf_size >> 8; 373 buf[1] = buf_size & 0xff; 374 dprintk("Chosen link buffer size of %i\n", buf_size); 375 376 /* write the buffer size to the CAM */ 377 ret = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, 378 IRQEN | CMDREG_SW); 379 if (ret) 380 return ret; 381 ret = dvb_ca_en50221_wait_if_status(ca, slot, STATUSREG_FR, HZ / 10); 382 if (ret) 383 return ret; 384 ret = dvb_ca_en50221_write_data(ca, slot, buf, 2); 385 if (ret != 2) 386 return -EIO; 387 ret = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, IRQEN); 388 if (ret) 389 return ret; 390 391 /* success */ 392 return 0; 393 } 394 395 /** 396 * dvb_ca_en50221_read_tuple - Read a tuple from attribute memory. 397 * 398 * @ca: CA instance. 399 * @slot: Slot id. 400 * @address: Address to read from. Updated. 401 * @tuple_type: Tuple id byte. Updated. 402 * @tuple_length: Tuple length. Updated. 403 * @tuple: Dest buffer for tuple (must be 256 bytes). Updated. 404 * 405 * return: 0 on success, nonzero on error. 406 */ 407 static int dvb_ca_en50221_read_tuple(struct dvb_ca_private *ca, int slot, 408 int *address, int *tuple_type, 409 int *tuple_length, u8 *tuple) 410 { 411 int i; 412 int _tuple_type; 413 int _tuple_length; 414 int _address = *address; 415 416 /* grab the next tuple length and type */ 417 _tuple_type = ca->pub->read_attribute_mem(ca->pub, slot, _address); 418 if (_tuple_type < 0) 419 return _tuple_type; 420 if (_tuple_type == 0xff) { 421 dprintk("END OF CHAIN TUPLE type:0x%x\n", _tuple_type); 422 *address += 2; 423 *tuple_type = _tuple_type; 424 *tuple_length = 0; 425 return 0; 426 } 427 _tuple_length = ca->pub->read_attribute_mem(ca->pub, slot, 428 _address + 2); 429 if (_tuple_length < 0) 430 return _tuple_length; 431 _address += 4; 432 433 dprintk("TUPLE type:0x%x length:%i\n", _tuple_type, _tuple_length); 434 435 /* read in the whole tuple */ 436 for (i = 0; i < _tuple_length; i++) { 437 tuple[i] = ca->pub->read_attribute_mem(ca->pub, slot, 438 _address + (i * 2)); 439 dprintk(" 0x%02x: 0x%02x %c\n", 440 i, tuple[i] & 0xff, 441 ((tuple[i] > 31) && (tuple[i] < 127)) ? tuple[i] : '.'); 442 } 443 _address += (_tuple_length * 2); 444 445 /* success */ 446 *tuple_type = _tuple_type; 447 *tuple_length = _tuple_length; 448 *address = _address; 449 return 0; 450 } 451 452 /** 453 * dvb_ca_en50221_parse_attributes - Parse attribute memory of a CAM module, 454 * extracting Config register, and checking it is a DVB CAM module. 455 * 456 * @ca: CA instance. 457 * @slot: Slot id. 458 * 459 * return: 0 on success, <0 on failure. 460 */ 461 static int dvb_ca_en50221_parse_attributes(struct dvb_ca_private *ca, int slot) 462 { 463 struct dvb_ca_slot *sl; 464 int address = 0; 465 int tuple_length; 466 int tuple_type; 467 u8 tuple[257]; 468 char *dvb_str; 469 int rasz; 470 int status; 471 int got_cftableentry = 0; 472 int end_chain = 0; 473 int i; 474 u16 manfid = 0; 475 u16 devid = 0; 476 477 /* CISTPL_DEVICE_0A */ 478 status = dvb_ca_en50221_read_tuple(ca, slot, &address, &tuple_type, 479 &tuple_length, tuple); 480 if (status < 0) 481 return status; 482 if (tuple_type != 0x1D) 483 return -EINVAL; 484 485 /* CISTPL_DEVICE_0C */ 486 status = dvb_ca_en50221_read_tuple(ca, slot, &address, &tuple_type, 487 &tuple_length, tuple); 488 if (status < 0) 489 return status; 490 if (tuple_type != 0x1C) 491 return -EINVAL; 492 493 /* CISTPL_VERS_1 */ 494 status = dvb_ca_en50221_read_tuple(ca, slot, &address, &tuple_type, 495 &tuple_length, tuple); 496 if (status < 0) 497 return status; 498 if (tuple_type != 0x15) 499 return -EINVAL; 500 501 /* CISTPL_MANFID */ 502 status = dvb_ca_en50221_read_tuple(ca, slot, &address, &tuple_type, 503 &tuple_length, tuple); 504 if (status < 0) 505 return status; 506 if (tuple_type != 0x20) 507 return -EINVAL; 508 if (tuple_length != 4) 509 return -EINVAL; 510 manfid = (tuple[1] << 8) | tuple[0]; 511 devid = (tuple[3] << 8) | tuple[2]; 512 513 /* CISTPL_CONFIG */ 514 status = dvb_ca_en50221_read_tuple(ca, slot, &address, &tuple_type, 515 &tuple_length, tuple); 516 if (status < 0) 517 return status; 518 if (tuple_type != 0x1A) 519 return -EINVAL; 520 if (tuple_length < 3) 521 return -EINVAL; 522 523 /* extract the configbase */ 524 rasz = tuple[0] & 3; 525 if (tuple_length < (3 + rasz + 14)) 526 return -EINVAL; 527 sl = &ca->slot_info[slot]; 528 sl->config_base = 0; 529 for (i = 0; i < rasz + 1; i++) 530 sl->config_base |= (tuple[2 + i] << (8 * i)); 531 532 /* check it contains the correct DVB string */ 533 dvb_str = findstr((char *)tuple, tuple_length, "DVB_CI_V", 8); 534 if (!dvb_str) 535 return -EINVAL; 536 if (tuple_length < ((dvb_str - (char *)tuple) + 12)) 537 return -EINVAL; 538 539 /* is it a version we support? */ 540 if (strncmp(dvb_str + 8, "1.00", 4)) { 541 pr_err("dvb_ca adapter %d: Unsupported DVB CAM module version %c%c%c%c\n", 542 ca->dvbdev->adapter->num, dvb_str[8], dvb_str[9], 543 dvb_str[10], dvb_str[11]); 544 return -EINVAL; 545 } 546 547 /* process the CFTABLE_ENTRY tuples, and any after those */ 548 while ((!end_chain) && (address < 0x1000)) { 549 status = dvb_ca_en50221_read_tuple(ca, slot, &address, 550 &tuple_type, &tuple_length, 551 tuple); 552 if (status < 0) 553 return status; 554 switch (tuple_type) { 555 case 0x1B: /* CISTPL_CFTABLE_ENTRY */ 556 if (tuple_length < (2 + 11 + 17)) 557 break; 558 559 /* if we've already parsed one, just use it */ 560 if (got_cftableentry) 561 break; 562 563 /* get the config option */ 564 sl->config_option = tuple[0] & 0x3f; 565 566 /* OK, check it contains the correct strings */ 567 if (!findstr((char *)tuple, tuple_length, 568 "DVB_HOST", 8) || 569 !findstr((char *)tuple, tuple_length, 570 "DVB_CI_MODULE", 13)) 571 break; 572 573 got_cftableentry = 1; 574 break; 575 576 case 0x14: /* CISTPL_NO_LINK */ 577 break; 578 579 case 0xFF: /* CISTPL_END */ 580 end_chain = 1; 581 break; 582 583 default: /* Unknown tuple type - just skip this tuple */ 584 dprintk("dvb_ca: Skipping unknown tuple type:0x%x length:0x%x\n", 585 tuple_type, tuple_length); 586 break; 587 } 588 } 589 590 if ((address > 0x1000) || (!got_cftableentry)) 591 return -EINVAL; 592 593 dprintk("Valid DVB CAM detected MANID:%x DEVID:%x CONFIGBASE:0x%x CONFIGOPTION:0x%x\n", 594 manfid, devid, sl->config_base, sl->config_option); 595 596 /* success! */ 597 return 0; 598 } 599 600 /** 601 * dvb_ca_en50221_set_configoption - Set CAM's configoption correctly. 602 * 603 * @ca: CA instance. 604 * @slot: Slot containing the CAM. 605 */ 606 static int dvb_ca_en50221_set_configoption(struct dvb_ca_private *ca, int slot) 607 { 608 struct dvb_ca_slot *sl = &ca->slot_info[slot]; 609 int configoption; 610 611 dprintk("%s\n", __func__); 612 613 /* set the config option */ 614 ca->pub->write_attribute_mem(ca->pub, slot, sl->config_base, 615 sl->config_option); 616 617 /* check it */ 618 configoption = ca->pub->read_attribute_mem(ca->pub, slot, 619 sl->config_base); 620 dprintk("Set configoption 0x%x, read configoption 0x%x\n", 621 sl->config_option, configoption & 0x3f); 622 623 /* fine! */ 624 return 0; 625 } 626 627 /** 628 * dvb_ca_en50221_read_data - This function talks to an EN50221 CAM control 629 * interface. It reads a buffer of data from the CAM. The data can either 630 * be stored in a supplied buffer, or automatically be added to the slot's 631 * rx_buffer. 632 * 633 * @ca: CA instance. 634 * @slot: Slot to read from. 635 * @ebuf: If non-NULL, the data will be written to this buffer. If NULL, 636 * the data will be added into the buffering system as a normal 637 * fragment. 638 * @ecount: Size of ebuf. Ignored if ebuf is NULL. 639 * 640 * return: Number of bytes read, or < 0 on error 641 */ 642 static int dvb_ca_en50221_read_data(struct dvb_ca_private *ca, int slot, 643 u8 *ebuf, int ecount) 644 { 645 struct dvb_ca_slot *sl = &ca->slot_info[slot]; 646 int bytes_read; 647 int status; 648 u8 buf[HOST_LINK_BUF_SIZE]; 649 int i; 650 651 dprintk("%s\n", __func__); 652 653 /* check if we have space for a link buf in the rx_buffer */ 654 if (!ebuf) { 655 int buf_free; 656 657 if (!sl->rx_buffer.data) { 658 status = -EIO; 659 goto exit; 660 } 661 buf_free = dvb_ringbuffer_free(&sl->rx_buffer); 662 663 if (buf_free < (sl->link_buf_size + 664 DVB_RINGBUFFER_PKTHDRSIZE)) { 665 status = -EAGAIN; 666 goto exit; 667 } 668 } 669 670 if (ca->pub->read_data && 671 (sl->slot_state != DVB_CA_SLOTSTATE_LINKINIT)) { 672 if (!ebuf) 673 status = ca->pub->read_data(ca->pub, slot, buf, 674 sizeof(buf)); 675 else 676 status = ca->pub->read_data(ca->pub, slot, buf, ecount); 677 if (status < 0) 678 return status; 679 bytes_read = status; 680 if (status == 0) 681 goto exit; 682 } else { 683 /* check if there is data available */ 684 status = ca->pub->read_cam_control(ca->pub, slot, 685 CTRLIF_STATUS); 686 if (status < 0) 687 goto exit; 688 if (!(status & STATUSREG_DA)) { 689 /* no data */ 690 status = 0; 691 goto exit; 692 } 693 694 /* read the amount of data */ 695 status = ca->pub->read_cam_control(ca->pub, slot, 696 CTRLIF_SIZE_HIGH); 697 if (status < 0) 698 goto exit; 699 bytes_read = status << 8; 700 status = ca->pub->read_cam_control(ca->pub, slot, 701 CTRLIF_SIZE_LOW); 702 if (status < 0) 703 goto exit; 704 bytes_read |= status; 705 706 /* check it will fit */ 707 if (!ebuf) { 708 if (bytes_read > sl->link_buf_size) { 709 pr_err("dvb_ca adapter %d: CAM tried to send a buffer larger than the link buffer size (%i > %i)!\n", 710 ca->dvbdev->adapter->num, bytes_read, 711 sl->link_buf_size); 712 sl->slot_state = DVB_CA_SLOTSTATE_LINKINIT; 713 status = -EIO; 714 goto exit; 715 } 716 if (bytes_read < 2) { 717 pr_err("dvb_ca adapter %d: CAM sent a buffer that was less than 2 bytes!\n", 718 ca->dvbdev->adapter->num); 719 sl->slot_state = DVB_CA_SLOTSTATE_LINKINIT; 720 status = -EIO; 721 goto exit; 722 } 723 } else { 724 if (bytes_read > ecount) { 725 pr_err("dvb_ca adapter %d: CAM tried to send a buffer larger than the ecount size!\n", 726 ca->dvbdev->adapter->num); 727 status = -EIO; 728 goto exit; 729 } 730 } 731 732 /* fill the buffer */ 733 for (i = 0; i < bytes_read; i++) { 734 /* read byte and check */ 735 status = ca->pub->read_cam_control(ca->pub, slot, 736 CTRLIF_DATA); 737 if (status < 0) 738 goto exit; 739 740 /* OK, store it in the buffer */ 741 buf[i] = status; 742 } 743 744 /* check for read error (RE should now be 0) */ 745 status = ca->pub->read_cam_control(ca->pub, slot, 746 CTRLIF_STATUS); 747 if (status < 0) 748 goto exit; 749 if (status & STATUSREG_RE) { 750 sl->slot_state = DVB_CA_SLOTSTATE_LINKINIT; 751 status = -EIO; 752 goto exit; 753 } 754 } 755 756 /* 757 * OK, add it to the receive buffer, or copy into external buffer if 758 * supplied 759 */ 760 if (!ebuf) { 761 if (!sl->rx_buffer.data) { 762 status = -EIO; 763 goto exit; 764 } 765 dvb_ringbuffer_pkt_write(&sl->rx_buffer, buf, bytes_read); 766 } else { 767 memcpy(ebuf, buf, bytes_read); 768 } 769 770 dprintk("Received CA packet for slot %i connection id 0x%x last_frag:%i size:0x%x\n", slot, 771 buf[0], (buf[1] & 0x80) == 0, bytes_read); 772 773 /* wake up readers when a last_fragment is received */ 774 if ((buf[1] & 0x80) == 0x00) 775 wake_up_interruptible(&ca->wait_queue); 776 777 status = bytes_read; 778 779 exit: 780 return status; 781 } 782 783 /** 784 * dvb_ca_en50221_write_data - This function talks to an EN50221 CAM control 785 * interface. It writes a buffer of data to a CAM. 786 * 787 * @ca: CA instance. 788 * @slot: Slot to write to. 789 * @buf: The data in this buffer is treated as a complete link-level packet to 790 * be written. 791 * @bytes_write: Size of ebuf. 792 * 793 * return: Number of bytes written, or < 0 on error. 794 */ 795 static int dvb_ca_en50221_write_data(struct dvb_ca_private *ca, int slot, 796 u8 *buf, int bytes_write) 797 { 798 struct dvb_ca_slot *sl = &ca->slot_info[slot]; 799 int status; 800 int i; 801 802 dprintk("%s\n", __func__); 803 804 /* sanity check */ 805 if (bytes_write > sl->link_buf_size) 806 return -EINVAL; 807 808 if (ca->pub->write_data && 809 (sl->slot_state != DVB_CA_SLOTSTATE_LINKINIT)) 810 return ca->pub->write_data(ca->pub, slot, buf, bytes_write); 811 812 /* 813 * it is possible we are dealing with a single buffer implementation, 814 * thus if there is data available for read or if there is even a read 815 * already in progress, we do nothing but awake the kernel thread to 816 * process the data if necessary. 817 */ 818 status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS); 819 if (status < 0) 820 goto exitnowrite; 821 if (status & (STATUSREG_DA | STATUSREG_RE)) { 822 if (status & STATUSREG_DA) 823 dvb_ca_en50221_thread_wakeup(ca); 824 825 status = -EAGAIN; 826 goto exitnowrite; 827 } 828 829 /* OK, set HC bit */ 830 status = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, 831 IRQEN | CMDREG_HC); 832 if (status) 833 goto exit; 834 835 /* check if interface is still free */ 836 status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS); 837 if (status < 0) 838 goto exit; 839 if (!(status & STATUSREG_FR)) { 840 /* it wasn't free => try again later */ 841 status = -EAGAIN; 842 goto exit; 843 } 844 845 /* 846 * It may need some time for the CAM to settle down, or there might 847 * be a race condition between the CAM, writing HC and our last 848 * check for DA. This happens, if the CAM asserts DA, just after 849 * checking DA before we are setting HC. In this case it might be 850 * a bug in the CAM to keep the FR bit, the lower layer/HW 851 * communication requires a longer timeout or the CAM needs more 852 * time internally. But this happens in reality! 853 * We need to read the status from the HW again and do the same 854 * we did for the previous check for DA 855 */ 856 status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS); 857 if (status < 0) 858 goto exit; 859 860 if (status & (STATUSREG_DA | STATUSREG_RE)) { 861 if (status & STATUSREG_DA) 862 dvb_ca_en50221_thread_wakeup(ca); 863 864 status = -EAGAIN; 865 goto exit; 866 } 867 868 /* send the amount of data */ 869 status = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_SIZE_HIGH, 870 bytes_write >> 8); 871 if (status) 872 goto exit; 873 status = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_SIZE_LOW, 874 bytes_write & 0xff); 875 if (status) 876 goto exit; 877 878 /* send the buffer */ 879 for (i = 0; i < bytes_write; i++) { 880 status = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_DATA, 881 buf[i]); 882 if (status) 883 goto exit; 884 } 885 886 /* check for write error (WE should now be 0) */ 887 status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS); 888 if (status < 0) 889 goto exit; 890 if (status & STATUSREG_WE) { 891 sl->slot_state = DVB_CA_SLOTSTATE_LINKINIT; 892 status = -EIO; 893 goto exit; 894 } 895 status = bytes_write; 896 897 dprintk("Wrote CA packet for slot %i, connection id 0x%x last_frag:%i size:0x%x\n", slot, 898 buf[0], (buf[1] & 0x80) == 0, bytes_write); 899 900 exit: 901 ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, IRQEN); 902 903 exitnowrite: 904 return status; 905 } 906 907 /* ************************************************************************** */ 908 /* EN50221 higher level functions */ 909 910 /** 911 * dvb_ca_en50221_slot_shutdown - A CAM has been removed => shut it down. 912 * 913 * @ca: CA instance. 914 * @slot: Slot to shut down. 915 */ 916 static int dvb_ca_en50221_slot_shutdown(struct dvb_ca_private *ca, int slot) 917 { 918 dprintk("%s\n", __func__); 919 920 ca->pub->slot_shutdown(ca->pub, slot); 921 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_NONE; 922 923 /* 924 * need to wake up all processes to check if they're now trying to 925 * write to a defunct CAM 926 */ 927 wake_up_interruptible(&ca->wait_queue); 928 929 dprintk("Slot %i shutdown\n", slot); 930 931 /* success */ 932 return 0; 933 } 934 935 /** 936 * dvb_ca_en50221_camchange_irq - A CAMCHANGE IRQ has occurred. 937 * 938 * @pubca: CA instance. 939 * @slot: Slot concerned. 940 * @change_type: One of the DVB_CA_CAMCHANGE_* values. 941 */ 942 void dvb_ca_en50221_camchange_irq(struct dvb_ca_en50221 *pubca, int slot, 943 int change_type) 944 { 945 struct dvb_ca_private *ca = pubca->private; 946 struct dvb_ca_slot *sl = &ca->slot_info[slot]; 947 948 dprintk("CAMCHANGE IRQ slot:%i change_type:%i\n", slot, change_type); 949 950 switch (change_type) { 951 case DVB_CA_EN50221_CAMCHANGE_REMOVED: 952 case DVB_CA_EN50221_CAMCHANGE_INSERTED: 953 break; 954 955 default: 956 return; 957 } 958 959 sl->camchange_type = change_type; 960 atomic_inc(&sl->camchange_count); 961 dvb_ca_en50221_thread_wakeup(ca); 962 } 963 EXPORT_SYMBOL(dvb_ca_en50221_camchange_irq); 964 965 /** 966 * dvb_ca_en50221_camready_irq - A CAMREADY IRQ has occurred. 967 * 968 * @pubca: CA instance. 969 * @slot: Slot concerned. 970 */ 971 void dvb_ca_en50221_camready_irq(struct dvb_ca_en50221 *pubca, int slot) 972 { 973 struct dvb_ca_private *ca = pubca->private; 974 struct dvb_ca_slot *sl = &ca->slot_info[slot]; 975 976 dprintk("CAMREADY IRQ slot:%i\n", slot); 977 978 if (sl->slot_state == DVB_CA_SLOTSTATE_WAITREADY) { 979 sl->slot_state = DVB_CA_SLOTSTATE_VALIDATE; 980 dvb_ca_en50221_thread_wakeup(ca); 981 } 982 } 983 EXPORT_SYMBOL(dvb_ca_en50221_camready_irq); 984 985 /** 986 * dvb_ca_en50221_frda_irq - An FR or DA IRQ has occurred. 987 * 988 * @pubca: CA instance. 989 * @slot: Slot concerned. 990 */ 991 void dvb_ca_en50221_frda_irq(struct dvb_ca_en50221 *pubca, int slot) 992 { 993 struct dvb_ca_private *ca = pubca->private; 994 struct dvb_ca_slot *sl = &ca->slot_info[slot]; 995 int flags; 996 997 dprintk("FR/DA IRQ slot:%i\n", slot); 998 999 switch (sl->slot_state) { 1000 case DVB_CA_SLOTSTATE_LINKINIT: 1001 flags = ca->pub->read_cam_control(pubca, slot, CTRLIF_STATUS); 1002 if (flags & STATUSREG_DA) { 1003 dprintk("CAM supports DA IRQ\n"); 1004 sl->da_irq_supported = 1; 1005 } 1006 break; 1007 1008 case DVB_CA_SLOTSTATE_RUNNING: 1009 if (ca->open) 1010 dvb_ca_en50221_thread_wakeup(ca); 1011 break; 1012 } 1013 } 1014 EXPORT_SYMBOL(dvb_ca_en50221_frda_irq); 1015 1016 /* ************************************************************************** */ 1017 /* EN50221 thread functions */ 1018 1019 /** 1020 * Wake up the DVB CA thread 1021 * 1022 * @ca: CA instance. 1023 */ 1024 static void dvb_ca_en50221_thread_wakeup(struct dvb_ca_private *ca) 1025 { 1026 dprintk("%s\n", __func__); 1027 1028 ca->wakeup = 1; 1029 mb(); 1030 wake_up_process(ca->thread); 1031 } 1032 1033 /** 1034 * Update the delay used by the thread. 1035 * 1036 * @ca: CA instance. 1037 */ 1038 static void dvb_ca_en50221_thread_update_delay(struct dvb_ca_private *ca) 1039 { 1040 int delay; 1041 int curdelay = 100000000; 1042 int slot; 1043 1044 /* 1045 * Beware of too high polling frequency, because one polling 1046 * call might take several hundred milliseconds until timeout! 1047 */ 1048 for (slot = 0; slot < ca->slot_count; slot++) { 1049 struct dvb_ca_slot *sl = &ca->slot_info[slot]; 1050 1051 switch (sl->slot_state) { 1052 default: 1053 case DVB_CA_SLOTSTATE_NONE: 1054 delay = HZ * 60; /* 60s */ 1055 if (!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE)) 1056 delay = HZ * 5; /* 5s */ 1057 break; 1058 case DVB_CA_SLOTSTATE_INVALID: 1059 delay = HZ * 60; /* 60s */ 1060 if (!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE)) 1061 delay = HZ / 10; /* 100ms */ 1062 break; 1063 1064 case DVB_CA_SLOTSTATE_UNINITIALISED: 1065 case DVB_CA_SLOTSTATE_WAITREADY: 1066 case DVB_CA_SLOTSTATE_VALIDATE: 1067 case DVB_CA_SLOTSTATE_WAITFR: 1068 case DVB_CA_SLOTSTATE_LINKINIT: 1069 delay = HZ / 10; /* 100ms */ 1070 break; 1071 1072 case DVB_CA_SLOTSTATE_RUNNING: 1073 delay = HZ * 60; /* 60s */ 1074 if (!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE)) 1075 delay = HZ / 10; /* 100ms */ 1076 if (ca->open) { 1077 if ((!sl->da_irq_supported) || 1078 (!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_DA))) 1079 delay = HZ / 10; /* 100ms */ 1080 } 1081 break; 1082 } 1083 1084 if (delay < curdelay) 1085 curdelay = delay; 1086 } 1087 1088 ca->delay = curdelay; 1089 } 1090 1091 /** 1092 * Poll if the CAM is gone. 1093 * 1094 * @ca: CA instance. 1095 * @slot: Slot to process. 1096 * return:: 0 .. no change 1097 * 1 .. CAM state changed 1098 */ 1099 1100 static int dvb_ca_en50221_poll_cam_gone(struct dvb_ca_private *ca, int slot) 1101 { 1102 int changed = 0; 1103 int status; 1104 1105 /* 1106 * we need this extra check for annoying interfaces like the 1107 * budget-av 1108 */ 1109 if ((!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE)) && 1110 (ca->pub->poll_slot_status)) { 1111 status = ca->pub->poll_slot_status(ca->pub, slot, 0); 1112 if (!(status & 1113 DVB_CA_EN50221_POLL_CAM_PRESENT)) { 1114 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_NONE; 1115 dvb_ca_en50221_thread_update_delay(ca); 1116 changed = 1; 1117 } 1118 } 1119 return changed; 1120 } 1121 1122 /** 1123 * Thread state machine for one CA slot to perform the data transfer. 1124 * 1125 * @ca: CA instance. 1126 * @slot: Slot to process. 1127 */ 1128 static void dvb_ca_en50221_thread_state_machine(struct dvb_ca_private *ca, 1129 int slot) 1130 { 1131 struct dvb_ca_slot *sl = &ca->slot_info[slot]; 1132 int flags; 1133 int pktcount; 1134 void *rxbuf; 1135 1136 mutex_lock(&sl->slot_lock); 1137 1138 /* check the cam status + deal with CAMCHANGEs */ 1139 while (dvb_ca_en50221_check_camstatus(ca, slot)) { 1140 /* clear down an old CI slot if necessary */ 1141 if (sl->slot_state != DVB_CA_SLOTSTATE_NONE) 1142 dvb_ca_en50221_slot_shutdown(ca, slot); 1143 1144 /* if a CAM is NOW present, initialise it */ 1145 if (sl->camchange_type == DVB_CA_EN50221_CAMCHANGE_INSERTED) 1146 sl->slot_state = DVB_CA_SLOTSTATE_UNINITIALISED; 1147 1148 /* we've handled one CAMCHANGE */ 1149 dvb_ca_en50221_thread_update_delay(ca); 1150 atomic_dec(&sl->camchange_count); 1151 } 1152 1153 /* CAM state machine */ 1154 switch (sl->slot_state) { 1155 case DVB_CA_SLOTSTATE_NONE: 1156 case DVB_CA_SLOTSTATE_INVALID: 1157 /* no action needed */ 1158 break; 1159 1160 case DVB_CA_SLOTSTATE_UNINITIALISED: 1161 sl->slot_state = DVB_CA_SLOTSTATE_WAITREADY; 1162 ca->pub->slot_reset(ca->pub, slot); 1163 sl->timeout = jiffies + (INIT_TIMEOUT_SECS * HZ); 1164 break; 1165 1166 case DVB_CA_SLOTSTATE_WAITREADY: 1167 if (time_after(jiffies, sl->timeout)) { 1168 pr_err("dvb_ca adaptor %d: PC card did not respond :(\n", 1169 ca->dvbdev->adapter->num); 1170 sl->slot_state = DVB_CA_SLOTSTATE_INVALID; 1171 dvb_ca_en50221_thread_update_delay(ca); 1172 break; 1173 } 1174 /* 1175 * no other action needed; will automatically change state when 1176 * ready 1177 */ 1178 break; 1179 1180 case DVB_CA_SLOTSTATE_VALIDATE: 1181 if (dvb_ca_en50221_parse_attributes(ca, slot) != 0) { 1182 if (dvb_ca_en50221_poll_cam_gone(ca, slot)) 1183 break; 1184 1185 pr_err("dvb_ca adapter %d: Invalid PC card inserted :(\n", 1186 ca->dvbdev->adapter->num); 1187 sl->slot_state = DVB_CA_SLOTSTATE_INVALID; 1188 dvb_ca_en50221_thread_update_delay(ca); 1189 break; 1190 } 1191 if (dvb_ca_en50221_set_configoption(ca, slot) != 0) { 1192 pr_err("dvb_ca adapter %d: Unable to initialise CAM :(\n", 1193 ca->dvbdev->adapter->num); 1194 sl->slot_state = DVB_CA_SLOTSTATE_INVALID; 1195 dvb_ca_en50221_thread_update_delay(ca); 1196 break; 1197 } 1198 if (ca->pub->write_cam_control(ca->pub, slot, 1199 CTRLIF_COMMAND, 1200 CMDREG_RS) != 0) { 1201 pr_err("dvb_ca adapter %d: Unable to reset CAM IF\n", 1202 ca->dvbdev->adapter->num); 1203 sl->slot_state = DVB_CA_SLOTSTATE_INVALID; 1204 dvb_ca_en50221_thread_update_delay(ca); 1205 break; 1206 } 1207 dprintk("DVB CAM validated successfully\n"); 1208 1209 sl->timeout = jiffies + (INIT_TIMEOUT_SECS * HZ); 1210 sl->slot_state = DVB_CA_SLOTSTATE_WAITFR; 1211 ca->wakeup = 1; 1212 break; 1213 1214 case DVB_CA_SLOTSTATE_WAITFR: 1215 if (time_after(jiffies, sl->timeout)) { 1216 pr_err("dvb_ca adapter %d: DVB CAM did not respond :(\n", 1217 ca->dvbdev->adapter->num); 1218 sl->slot_state = DVB_CA_SLOTSTATE_INVALID; 1219 dvb_ca_en50221_thread_update_delay(ca); 1220 break; 1221 } 1222 1223 flags = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS); 1224 if (flags & STATUSREG_FR) { 1225 sl->slot_state = DVB_CA_SLOTSTATE_LINKINIT; 1226 ca->wakeup = 1; 1227 } 1228 break; 1229 1230 case DVB_CA_SLOTSTATE_LINKINIT: 1231 if (dvb_ca_en50221_link_init(ca, slot) != 0) { 1232 if (dvb_ca_en50221_poll_cam_gone(ca, slot)) 1233 break; 1234 1235 pr_err("dvb_ca adapter %d: DVB CAM link initialisation failed :(\n", 1236 ca->dvbdev->adapter->num); 1237 sl->slot_state = DVB_CA_SLOTSTATE_UNINITIALISED; 1238 dvb_ca_en50221_thread_update_delay(ca); 1239 break; 1240 } 1241 1242 if (!sl->rx_buffer.data) { 1243 rxbuf = vmalloc(RX_BUFFER_SIZE); 1244 if (!rxbuf) { 1245 pr_err("dvb_ca adapter %d: Unable to allocate CAM rx buffer :(\n", 1246 ca->dvbdev->adapter->num); 1247 sl->slot_state = DVB_CA_SLOTSTATE_INVALID; 1248 dvb_ca_en50221_thread_update_delay(ca); 1249 break; 1250 } 1251 dvb_ringbuffer_init(&sl->rx_buffer, rxbuf, 1252 RX_BUFFER_SIZE); 1253 } 1254 1255 ca->pub->slot_ts_enable(ca->pub, slot); 1256 sl->slot_state = DVB_CA_SLOTSTATE_RUNNING; 1257 dvb_ca_en50221_thread_update_delay(ca); 1258 pr_info("dvb_ca adapter %d: DVB CAM detected and initialised successfully\n", 1259 ca->dvbdev->adapter->num); 1260 break; 1261 1262 case DVB_CA_SLOTSTATE_RUNNING: 1263 if (!ca->open) 1264 break; 1265 1266 /* poll slots for data */ 1267 pktcount = 0; 1268 while (dvb_ca_en50221_read_data(ca, slot, NULL, 0) > 0) { 1269 if (!ca->open) 1270 break; 1271 1272 /* 1273 * if a CAMCHANGE occurred at some point, do not do any 1274 * more processing of this slot 1275 */ 1276 if (dvb_ca_en50221_check_camstatus(ca, slot)) { 1277 /* 1278 * we don't want to sleep on the next iteration 1279 * so we can handle the cam change 1280 */ 1281 ca->wakeup = 1; 1282 break; 1283 } 1284 1285 /* check if we've hit our limit this time */ 1286 if (++pktcount >= MAX_RX_PACKETS_PER_ITERATION) { 1287 /* 1288 * don't sleep; there is likely to be more data 1289 * to read 1290 */ 1291 ca->wakeup = 1; 1292 break; 1293 } 1294 } 1295 break; 1296 } 1297 1298 mutex_unlock(&sl->slot_lock); 1299 } 1300 1301 /* 1302 * Kernel thread which monitors CA slots for CAM changes, and performs data 1303 * transfers. 1304 */ 1305 static int dvb_ca_en50221_thread(void *data) 1306 { 1307 struct dvb_ca_private *ca = data; 1308 int slot; 1309 1310 dprintk("%s\n", __func__); 1311 1312 /* choose the correct initial delay */ 1313 dvb_ca_en50221_thread_update_delay(ca); 1314 1315 /* main loop */ 1316 while (!kthread_should_stop()) { 1317 /* sleep for a bit */ 1318 if (!ca->wakeup) { 1319 set_current_state(TASK_INTERRUPTIBLE); 1320 schedule_timeout(ca->delay); 1321 if (kthread_should_stop()) 1322 return 0; 1323 } 1324 ca->wakeup = 0; 1325 1326 /* go through all the slots processing them */ 1327 for (slot = 0; slot < ca->slot_count; slot++) 1328 dvb_ca_en50221_thread_state_machine(ca, slot); 1329 } 1330 1331 return 0; 1332 } 1333 1334 /* ************************************************************************** */ 1335 /* EN50221 IO interface functions */ 1336 1337 /** 1338 * Real ioctl implementation. 1339 * NOTE: CA_SEND_MSG/CA_GET_MSG ioctls have userspace buffers passed to them. 1340 * 1341 * @file: File concerned. 1342 * @cmd: IOCTL command. 1343 * @parg: Associated argument. 1344 * 1345 * return: 0 on success, <0 on error. 1346 */ 1347 static int dvb_ca_en50221_io_do_ioctl(struct file *file, 1348 unsigned int cmd, void *parg) 1349 { 1350 struct dvb_device *dvbdev = file->private_data; 1351 struct dvb_ca_private *ca = dvbdev->priv; 1352 int err = 0; 1353 int slot; 1354 1355 dprintk("%s\n", __func__); 1356 1357 if (mutex_lock_interruptible(&ca->ioctl_mutex)) 1358 return -ERESTARTSYS; 1359 1360 switch (cmd) { 1361 case CA_RESET: 1362 for (slot = 0; slot < ca->slot_count; slot++) { 1363 struct dvb_ca_slot *sl = &ca->slot_info[slot]; 1364 1365 mutex_lock(&sl->slot_lock); 1366 if (sl->slot_state != DVB_CA_SLOTSTATE_NONE) { 1367 dvb_ca_en50221_slot_shutdown(ca, slot); 1368 if (ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE) 1369 dvb_ca_en50221_camchange_irq(ca->pub, 1370 slot, 1371 DVB_CA_EN50221_CAMCHANGE_INSERTED); 1372 } 1373 mutex_unlock(&sl->slot_lock); 1374 } 1375 ca->next_read_slot = 0; 1376 dvb_ca_en50221_thread_wakeup(ca); 1377 break; 1378 1379 case CA_GET_CAP: { 1380 struct ca_caps *caps = parg; 1381 1382 caps->slot_num = ca->slot_count; 1383 caps->slot_type = CA_CI_LINK; 1384 caps->descr_num = 0; 1385 caps->descr_type = 0; 1386 break; 1387 } 1388 1389 case CA_GET_SLOT_INFO: { 1390 struct ca_slot_info *info = parg; 1391 struct dvb_ca_slot *sl; 1392 1393 slot = info->num; 1394 if ((slot > ca->slot_count) || (slot < 0)) { 1395 err = -EINVAL; 1396 goto out_unlock; 1397 } 1398 1399 info->type = CA_CI_LINK; 1400 info->flags = 0; 1401 sl = &ca->slot_info[slot]; 1402 if ((sl->slot_state != DVB_CA_SLOTSTATE_NONE) && 1403 (sl->slot_state != DVB_CA_SLOTSTATE_INVALID)) { 1404 info->flags = CA_CI_MODULE_PRESENT; 1405 } 1406 if (sl->slot_state == DVB_CA_SLOTSTATE_RUNNING) 1407 info->flags |= CA_CI_MODULE_READY; 1408 break; 1409 } 1410 1411 default: 1412 err = -EINVAL; 1413 break; 1414 } 1415 1416 out_unlock: 1417 mutex_unlock(&ca->ioctl_mutex); 1418 return err; 1419 } 1420 1421 /** 1422 * Wrapper for ioctl implementation. 1423 * 1424 * @file: File concerned. 1425 * @cmd: IOCTL command. 1426 * @arg: Associated argument. 1427 * 1428 * return: 0 on success, <0 on error. 1429 */ 1430 static long dvb_ca_en50221_io_ioctl(struct file *file, 1431 unsigned int cmd, unsigned long arg) 1432 { 1433 return dvb_usercopy(file, cmd, arg, dvb_ca_en50221_io_do_ioctl); 1434 } 1435 1436 /** 1437 * Implementation of write() syscall. 1438 * 1439 * @file: File structure. 1440 * @buf: Source buffer. 1441 * @count: Size of source buffer. 1442 * @ppos: Position in file (ignored). 1443 * 1444 * return: Number of bytes read, or <0 on error. 1445 */ 1446 static ssize_t dvb_ca_en50221_io_write(struct file *file, 1447 const char __user *buf, size_t count, 1448 loff_t *ppos) 1449 { 1450 struct dvb_device *dvbdev = file->private_data; 1451 struct dvb_ca_private *ca = dvbdev->priv; 1452 struct dvb_ca_slot *sl; 1453 u8 slot, connection_id; 1454 int status; 1455 u8 fragbuf[HOST_LINK_BUF_SIZE]; 1456 int fragpos = 0; 1457 int fraglen; 1458 unsigned long timeout; 1459 int written; 1460 1461 dprintk("%s\n", __func__); 1462 1463 /* 1464 * Incoming packet has a 2 byte header. 1465 * hdr[0] = slot_id, hdr[1] = connection_id 1466 */ 1467 if (count < 2) 1468 return -EINVAL; 1469 1470 /* extract slot & connection id */ 1471 if (copy_from_user(&slot, buf, 1)) 1472 return -EFAULT; 1473 if (copy_from_user(&connection_id, buf + 1, 1)) 1474 return -EFAULT; 1475 buf += 2; 1476 count -= 2; 1477 1478 if (slot >= ca->slot_count) 1479 return -EINVAL; 1480 slot = array_index_nospec(slot, ca->slot_count); 1481 sl = &ca->slot_info[slot]; 1482 1483 /* check if the slot is actually running */ 1484 if (sl->slot_state != DVB_CA_SLOTSTATE_RUNNING) 1485 return -EINVAL; 1486 1487 /* fragment the packets & store in the buffer */ 1488 while (fragpos < count) { 1489 fraglen = sl->link_buf_size - 2; 1490 if (fraglen < 0) 1491 break; 1492 if (fraglen > HOST_LINK_BUF_SIZE - 2) 1493 fraglen = HOST_LINK_BUF_SIZE - 2; 1494 if ((count - fragpos) < fraglen) 1495 fraglen = count - fragpos; 1496 1497 fragbuf[0] = connection_id; 1498 fragbuf[1] = ((fragpos + fraglen) < count) ? 0x80 : 0x00; 1499 status = copy_from_user(fragbuf + 2, buf + fragpos, fraglen); 1500 if (status) { 1501 status = -EFAULT; 1502 goto exit; 1503 } 1504 1505 timeout = jiffies + HZ / 2; 1506 written = 0; 1507 while (!time_after(jiffies, timeout)) { 1508 /* 1509 * check the CAM hasn't been removed/reset in the 1510 * meantime 1511 */ 1512 if (sl->slot_state != DVB_CA_SLOTSTATE_RUNNING) { 1513 status = -EIO; 1514 goto exit; 1515 } 1516 1517 mutex_lock(&sl->slot_lock); 1518 status = dvb_ca_en50221_write_data(ca, slot, fragbuf, 1519 fraglen + 2); 1520 mutex_unlock(&sl->slot_lock); 1521 if (status == (fraglen + 2)) { 1522 written = 1; 1523 break; 1524 } 1525 if (status != -EAGAIN) 1526 goto exit; 1527 1528 usleep_range(1000, 1100); 1529 } 1530 if (!written) { 1531 status = -EIO; 1532 goto exit; 1533 } 1534 1535 fragpos += fraglen; 1536 } 1537 status = count + 2; 1538 1539 exit: 1540 return status; 1541 } 1542 1543 /* 1544 * Condition for waking up in dvb_ca_en50221_io_read_condition 1545 */ 1546 static int dvb_ca_en50221_io_read_condition(struct dvb_ca_private *ca, 1547 int *result, int *_slot) 1548 { 1549 int slot; 1550 int slot_count = 0; 1551 int idx; 1552 size_t fraglen; 1553 int connection_id = -1; 1554 int found = 0; 1555 u8 hdr[2]; 1556 1557 slot = ca->next_read_slot; 1558 while ((slot_count < ca->slot_count) && (!found)) { 1559 struct dvb_ca_slot *sl = &ca->slot_info[slot]; 1560 1561 if (sl->slot_state != DVB_CA_SLOTSTATE_RUNNING) 1562 goto nextslot; 1563 1564 if (!sl->rx_buffer.data) 1565 return 0; 1566 1567 idx = dvb_ringbuffer_pkt_next(&sl->rx_buffer, -1, &fraglen); 1568 while (idx != -1) { 1569 dvb_ringbuffer_pkt_read(&sl->rx_buffer, idx, 0, hdr, 2); 1570 if (connection_id == -1) 1571 connection_id = hdr[0]; 1572 if ((hdr[0] == connection_id) && 1573 ((hdr[1] & 0x80) == 0)) { 1574 *_slot = slot; 1575 found = 1; 1576 break; 1577 } 1578 1579 idx = dvb_ringbuffer_pkt_next(&sl->rx_buffer, idx, 1580 &fraglen); 1581 } 1582 1583 nextslot: 1584 slot = (slot + 1) % ca->slot_count; 1585 slot_count++; 1586 } 1587 1588 ca->next_read_slot = slot; 1589 return found; 1590 } 1591 1592 /** 1593 * Implementation of read() syscall. 1594 * 1595 * @file: File structure. 1596 * @buf: Destination buffer. 1597 * @count: Size of destination buffer. 1598 * @ppos: Position in file (ignored). 1599 * 1600 * return: Number of bytes read, or <0 on error. 1601 */ 1602 static ssize_t dvb_ca_en50221_io_read(struct file *file, char __user *buf, 1603 size_t count, loff_t *ppos) 1604 { 1605 struct dvb_device *dvbdev = file->private_data; 1606 struct dvb_ca_private *ca = dvbdev->priv; 1607 struct dvb_ca_slot *sl; 1608 int status; 1609 int result = 0; 1610 u8 hdr[2]; 1611 int slot; 1612 int connection_id = -1; 1613 size_t idx, idx2; 1614 int last_fragment = 0; 1615 size_t fraglen; 1616 int pktlen; 1617 int dispose = 0; 1618 1619 dprintk("%s\n", __func__); 1620 1621 /* 1622 * Outgoing packet has a 2 byte header. 1623 * hdr[0] = slot_id, hdr[1] = connection_id 1624 */ 1625 if (count < 2) 1626 return -EINVAL; 1627 1628 /* wait for some data */ 1629 status = dvb_ca_en50221_io_read_condition(ca, &result, &slot); 1630 if (status == 0) { 1631 /* if we're in nonblocking mode, exit immediately */ 1632 if (file->f_flags & O_NONBLOCK) 1633 return -EWOULDBLOCK; 1634 1635 /* wait for some data */ 1636 status = wait_event_interruptible(ca->wait_queue, 1637 dvb_ca_en50221_io_read_condition 1638 (ca, &result, &slot)); 1639 } 1640 if ((status < 0) || (result < 0)) { 1641 if (result) 1642 return result; 1643 return status; 1644 } 1645 1646 sl = &ca->slot_info[slot]; 1647 idx = dvb_ringbuffer_pkt_next(&sl->rx_buffer, -1, &fraglen); 1648 pktlen = 2; 1649 do { 1650 if (idx == -1) { 1651 pr_err("dvb_ca adapter %d: BUG: read packet ended before last_fragment encountered\n", 1652 ca->dvbdev->adapter->num); 1653 status = -EIO; 1654 goto exit; 1655 } 1656 1657 dvb_ringbuffer_pkt_read(&sl->rx_buffer, idx, 0, hdr, 2); 1658 if (connection_id == -1) 1659 connection_id = hdr[0]; 1660 if (hdr[0] == connection_id) { 1661 if (pktlen < count) { 1662 if ((pktlen + fraglen - 2) > count) 1663 fraglen = count - pktlen; 1664 else 1665 fraglen -= 2; 1666 1667 status = 1668 dvb_ringbuffer_pkt_read_user(&sl->rx_buffer, 1669 idx, 2, 1670 buf + pktlen, 1671 fraglen); 1672 if (status < 0) 1673 goto exit; 1674 1675 pktlen += fraglen; 1676 } 1677 1678 if ((hdr[1] & 0x80) == 0) 1679 last_fragment = 1; 1680 dispose = 1; 1681 } 1682 1683 idx2 = dvb_ringbuffer_pkt_next(&sl->rx_buffer, idx, &fraglen); 1684 if (dispose) 1685 dvb_ringbuffer_pkt_dispose(&sl->rx_buffer, idx); 1686 idx = idx2; 1687 dispose = 0; 1688 } while (!last_fragment); 1689 1690 hdr[0] = slot; 1691 hdr[1] = connection_id; 1692 status = copy_to_user(buf, hdr, 2); 1693 if (status) { 1694 status = -EFAULT; 1695 goto exit; 1696 } 1697 status = pktlen; 1698 1699 exit: 1700 return status; 1701 } 1702 1703 /** 1704 * Implementation of file open syscall. 1705 * 1706 * @inode: Inode concerned. 1707 * @file: File concerned. 1708 * 1709 * return: 0 on success, <0 on failure. 1710 */ 1711 static int dvb_ca_en50221_io_open(struct inode *inode, struct file *file) 1712 { 1713 struct dvb_device *dvbdev = file->private_data; 1714 struct dvb_ca_private *ca = dvbdev->priv; 1715 int err; 1716 int i; 1717 1718 dprintk("%s\n", __func__); 1719 1720 if (!try_module_get(ca->pub->owner)) 1721 return -EIO; 1722 1723 err = dvb_generic_open(inode, file); 1724 if (err < 0) { 1725 module_put(ca->pub->owner); 1726 return err; 1727 } 1728 1729 for (i = 0; i < ca->slot_count; i++) { 1730 struct dvb_ca_slot *sl = &ca->slot_info[i]; 1731 1732 if (sl->slot_state == DVB_CA_SLOTSTATE_RUNNING) { 1733 if (!sl->rx_buffer.data) { 1734 /* 1735 * it is safe to call this here without locks 1736 * because ca->open == 0. Data is not read in 1737 * this case 1738 */ 1739 dvb_ringbuffer_flush(&sl->rx_buffer); 1740 } 1741 } 1742 } 1743 1744 ca->open = 1; 1745 dvb_ca_en50221_thread_update_delay(ca); 1746 dvb_ca_en50221_thread_wakeup(ca); 1747 1748 dvb_ca_private_get(ca); 1749 1750 return 0; 1751 } 1752 1753 /** 1754 * Implementation of file close syscall. 1755 * 1756 * @inode: Inode concerned. 1757 * @file: File concerned. 1758 * 1759 * return: 0 on success, <0 on failure. 1760 */ 1761 static int dvb_ca_en50221_io_release(struct inode *inode, struct file *file) 1762 { 1763 struct dvb_device *dvbdev = file->private_data; 1764 struct dvb_ca_private *ca = dvbdev->priv; 1765 int err; 1766 1767 dprintk("%s\n", __func__); 1768 1769 /* mark the CA device as closed */ 1770 ca->open = 0; 1771 dvb_ca_en50221_thread_update_delay(ca); 1772 1773 err = dvb_generic_release(inode, file); 1774 1775 module_put(ca->pub->owner); 1776 1777 dvb_ca_private_put(ca); 1778 1779 return err; 1780 } 1781 1782 /** 1783 * Implementation of poll() syscall. 1784 * 1785 * @file: File concerned. 1786 * @wait: poll wait table. 1787 * 1788 * return: Standard poll mask. 1789 */ 1790 static __poll_t dvb_ca_en50221_io_poll(struct file *file, poll_table *wait) 1791 { 1792 struct dvb_device *dvbdev = file->private_data; 1793 struct dvb_ca_private *ca = dvbdev->priv; 1794 __poll_t mask = 0; 1795 int slot; 1796 int result = 0; 1797 1798 dprintk("%s\n", __func__); 1799 1800 if (dvb_ca_en50221_io_read_condition(ca, &result, &slot) == 1) 1801 mask |= EPOLLIN; 1802 1803 /* if there is something, return now */ 1804 if (mask) 1805 return mask; 1806 1807 /* wait for something to happen */ 1808 poll_wait(file, &ca->wait_queue, wait); 1809 1810 if (dvb_ca_en50221_io_read_condition(ca, &result, &slot) == 1) 1811 mask |= EPOLLIN; 1812 1813 return mask; 1814 } 1815 1816 static const struct file_operations dvb_ca_fops = { 1817 .owner = THIS_MODULE, 1818 .read = dvb_ca_en50221_io_read, 1819 .write = dvb_ca_en50221_io_write, 1820 .unlocked_ioctl = dvb_ca_en50221_io_ioctl, 1821 .open = dvb_ca_en50221_io_open, 1822 .release = dvb_ca_en50221_io_release, 1823 .poll = dvb_ca_en50221_io_poll, 1824 .llseek = noop_llseek, 1825 }; 1826 1827 static const struct dvb_device dvbdev_ca = { 1828 .priv = NULL, 1829 .users = 1, 1830 .readers = 1, 1831 .writers = 1, 1832 #if defined(CONFIG_MEDIA_CONTROLLER_DVB) 1833 .name = "dvb-ca-en50221", 1834 #endif 1835 .fops = &dvb_ca_fops, 1836 }; 1837 1838 /* ************************************************************************** */ 1839 /* Initialisation/shutdown functions */ 1840 1841 /** 1842 * Initialise a new DVB CA EN50221 interface device. 1843 * 1844 * @dvb_adapter: DVB adapter to attach the new CA device to. 1845 * @pubca: The dvb_ca instance. 1846 * @flags: Flags describing the CA device (DVB_CA_FLAG_*). 1847 * @slot_count: Number of slots supported. 1848 * 1849 * return: 0 on success, nonzero on failure 1850 */ 1851 int dvb_ca_en50221_init(struct dvb_adapter *dvb_adapter, 1852 struct dvb_ca_en50221 *pubca, int flags, int slot_count) 1853 { 1854 int ret; 1855 struct dvb_ca_private *ca = NULL; 1856 int i; 1857 1858 dprintk("%s\n", __func__); 1859 1860 if (slot_count < 1) 1861 return -EINVAL; 1862 1863 /* initialise the system data */ 1864 ca = kzalloc(sizeof(*ca), GFP_KERNEL); 1865 if (!ca) { 1866 ret = -ENOMEM; 1867 goto exit; 1868 } 1869 kref_init(&ca->refcount); 1870 ca->pub = pubca; 1871 ca->flags = flags; 1872 ca->slot_count = slot_count; 1873 ca->slot_info = kcalloc(slot_count, sizeof(struct dvb_ca_slot), 1874 GFP_KERNEL); 1875 if (!ca->slot_info) { 1876 ret = -ENOMEM; 1877 goto free_ca; 1878 } 1879 init_waitqueue_head(&ca->wait_queue); 1880 ca->open = 0; 1881 ca->wakeup = 0; 1882 ca->next_read_slot = 0; 1883 pubca->private = ca; 1884 1885 /* register the DVB device */ 1886 ret = dvb_register_device(dvb_adapter, &ca->dvbdev, &dvbdev_ca, ca, 1887 DVB_DEVICE_CA, 0); 1888 if (ret) 1889 goto free_slot_info; 1890 1891 /* now initialise each slot */ 1892 for (i = 0; i < slot_count; i++) { 1893 struct dvb_ca_slot *sl = &ca->slot_info[i]; 1894 1895 memset(sl, 0, sizeof(struct dvb_ca_slot)); 1896 sl->slot_state = DVB_CA_SLOTSTATE_NONE; 1897 atomic_set(&sl->camchange_count, 0); 1898 sl->camchange_type = DVB_CA_EN50221_CAMCHANGE_REMOVED; 1899 mutex_init(&sl->slot_lock); 1900 } 1901 1902 mutex_init(&ca->ioctl_mutex); 1903 1904 if (signal_pending(current)) { 1905 ret = -EINTR; 1906 goto unregister_device; 1907 } 1908 mb(); 1909 1910 /* create a kthread for monitoring this CA device */ 1911 ca->thread = kthread_run(dvb_ca_en50221_thread, ca, "kdvb-ca-%i:%i", 1912 ca->dvbdev->adapter->num, ca->dvbdev->id); 1913 if (IS_ERR(ca->thread)) { 1914 ret = PTR_ERR(ca->thread); 1915 pr_err("dvb_ca_init: failed to start kernel_thread (%d)\n", 1916 ret); 1917 goto unregister_device; 1918 } 1919 return 0; 1920 1921 unregister_device: 1922 dvb_unregister_device(ca->dvbdev); 1923 free_slot_info: 1924 kfree(ca->slot_info); 1925 free_ca: 1926 kfree(ca); 1927 exit: 1928 pubca->private = NULL; 1929 return ret; 1930 } 1931 EXPORT_SYMBOL(dvb_ca_en50221_init); 1932 1933 /** 1934 * Release a DVB CA EN50221 interface device. 1935 * 1936 * @pubca: The associated dvb_ca instance. 1937 */ 1938 void dvb_ca_en50221_release(struct dvb_ca_en50221 *pubca) 1939 { 1940 struct dvb_ca_private *ca = pubca->private; 1941 int i; 1942 1943 dprintk("%s\n", __func__); 1944 1945 /* shutdown the thread if there was one */ 1946 kthread_stop(ca->thread); 1947 1948 for (i = 0; i < ca->slot_count; i++) 1949 dvb_ca_en50221_slot_shutdown(ca, i); 1950 1951 dvb_remove_device(ca->dvbdev); 1952 dvb_ca_private_put(ca); 1953 pubca->private = NULL; 1954 } 1955 EXPORT_SYMBOL(dvb_ca_en50221_release); 1956