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/vmalloc.h> 35 #include <linux/delay.h> 36 #include <linux/spinlock.h> 37 #include <linux/sched/signal.h> 38 #include <linux/kthread.h> 39 40 #include "dvb_ca_en50221.h" 41 #include "dvb_ringbuffer.h" 42 43 static int dvb_ca_en50221_debug; 44 45 module_param_named(cam_debug, dvb_ca_en50221_debug, int, 0644); 46 MODULE_PARM_DESC(cam_debug, "enable verbose debug messages"); 47 48 #define dprintk(fmt, arg...) do { \ 49 if (dvb_ca_en50221_debug) \ 50 printk(KERN_DEBUG pr_fmt("%s: " fmt), __func__, ##arg);\ 51 } while (0) 52 53 #define INIT_TIMEOUT_SECS 10 54 55 #define HOST_LINK_BUF_SIZE 0x200 56 57 #define RX_BUFFER_SIZE 65535 58 59 #define MAX_RX_PACKETS_PER_ITERATION 10 60 61 #define CTRLIF_DATA 0 62 #define CTRLIF_COMMAND 1 63 #define CTRLIF_STATUS 1 64 #define CTRLIF_SIZE_LOW 2 65 #define CTRLIF_SIZE_HIGH 3 66 67 #define CMDREG_HC 1 /* Host control */ 68 #define CMDREG_SW 2 /* Size write */ 69 #define CMDREG_SR 4 /* Size read */ 70 #define CMDREG_RS 8 /* Reset interface */ 71 #define CMDREG_FRIE 0x40 /* Enable FR interrupt */ 72 #define CMDREG_DAIE 0x80 /* Enable DA interrupt */ 73 #define IRQEN (CMDREG_DAIE) 74 75 #define STATUSREG_RE 1 /* read error */ 76 #define STATUSREG_WE 2 /* write error */ 77 #define STATUSREG_FR 0x40 /* module free */ 78 #define STATUSREG_DA 0x80 /* data available */ 79 #define STATUSREG_TXERR (STATUSREG_RE|STATUSREG_WE) /* general transfer error */ 80 81 82 #define DVB_CA_SLOTSTATE_NONE 0 83 #define DVB_CA_SLOTSTATE_UNINITIALISED 1 84 #define DVB_CA_SLOTSTATE_RUNNING 2 85 #define DVB_CA_SLOTSTATE_INVALID 3 86 #define DVB_CA_SLOTSTATE_WAITREADY 4 87 #define DVB_CA_SLOTSTATE_VALIDATE 5 88 #define DVB_CA_SLOTSTATE_WAITFR 6 89 #define DVB_CA_SLOTSTATE_LINKINIT 7 90 91 92 /* Information on a CA slot */ 93 struct dvb_ca_slot { 94 95 /* current state of the CAM */ 96 int slot_state; 97 98 /* mutex used for serializing access to one CI slot */ 99 struct mutex slot_lock; 100 101 /* Number of CAMCHANGES that have occurred since last processing */ 102 atomic_t camchange_count; 103 104 /* Type of last CAMCHANGE */ 105 int camchange_type; 106 107 /* base address of CAM config */ 108 u32 config_base; 109 110 /* value to write into Config Control register */ 111 u8 config_option; 112 113 /* if 1, the CAM supports DA IRQs */ 114 u8 da_irq_supported:1; 115 116 /* size of the buffer to use when talking to the CAM */ 117 int link_buf_size; 118 119 /* buffer for incoming packets */ 120 struct dvb_ringbuffer rx_buffer; 121 122 /* timer used during various states of the slot */ 123 unsigned long timeout; 124 }; 125 126 /* Private CA-interface information */ 127 struct dvb_ca_private { 128 struct kref refcount; 129 130 /* pointer back to the public data structure */ 131 struct dvb_ca_en50221 *pub; 132 133 /* the DVB device */ 134 struct dvb_device *dvbdev; 135 136 /* Flags describing the interface (DVB_CA_FLAG_*) */ 137 u32 flags; 138 139 /* number of slots supported by this CA interface */ 140 unsigned int slot_count; 141 142 /* information on each slot */ 143 struct dvb_ca_slot *slot_info; 144 145 /* wait queues for read() and write() operations */ 146 wait_queue_head_t wait_queue; 147 148 /* PID of the monitoring thread */ 149 struct task_struct *thread; 150 151 /* Flag indicating if the CA device is open */ 152 unsigned int open:1; 153 154 /* Flag indicating the thread should wake up now */ 155 unsigned int wakeup:1; 156 157 /* Delay the main thread should use */ 158 unsigned long delay; 159 160 /* Slot to start looking for data to read from in the next user-space read operation */ 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 = container_of(ref, struct dvb_ca_private, refcount); 182 dvb_ca_private_free(ca); 183 } 184 185 static void dvb_ca_private_get(struct dvb_ca_private *ca) 186 { 187 kref_get(&ca->refcount); 188 } 189 190 static void dvb_ca_private_put(struct dvb_ca_private *ca) 191 { 192 kref_put(&ca->refcount, dvb_ca_private_release); 193 } 194 195 static void dvb_ca_en50221_thread_wakeup(struct dvb_ca_private *ca); 196 static int dvb_ca_en50221_read_data(struct dvb_ca_private *ca, int slot, u8 * ebuf, int ecount); 197 static int dvb_ca_en50221_write_data(struct dvb_ca_private *ca, int slot, u8 * ebuf, int ecount); 198 199 200 /** 201 * Safely find needle in haystack. 202 * 203 * @haystack: Buffer to look in. 204 * @hlen: Number of bytes in haystack. 205 * @needle: Buffer to find. 206 * @nlen: Number of bytes in needle. 207 * @return Pointer into haystack needle was found at, or NULL if not found. 208 */ 209 static char *findstr(char * haystack, int hlen, char * needle, int nlen) 210 { 211 int i; 212 213 if (hlen < nlen) 214 return NULL; 215 216 for (i = 0; i <= hlen - nlen; i++) { 217 if (!strncmp(haystack + i, needle, nlen)) 218 return haystack + i; 219 } 220 221 return NULL; 222 } 223 224 225 226 /* ******************************************************************************** */ 227 /* EN50221 physical interface functions */ 228 229 230 /** 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 int slot_status; 236 int cam_present_now; 237 int cam_changed; 238 239 /* IRQ mode */ 240 if (ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE) { 241 return (atomic_read(&ca->slot_info[slot].camchange_count) != 0); 242 } 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 = (ca->slot_info[slot].slot_state != DVB_CA_SLOTSTATE_NONE); 251 cam_changed = (cam_present_now != cam_present_old); 252 } 253 254 if (cam_changed) { 255 if (!cam_present_now) { 256 ca->slot_info[slot].camchange_type = DVB_CA_EN50221_CAMCHANGE_REMOVED; 257 } else { 258 ca->slot_info[slot].camchange_type = DVB_CA_EN50221_CAMCHANGE_INSERTED; 259 } 260 atomic_set(&ca->slot_info[slot].camchange_count, 1); 261 } else { 262 if ((ca->slot_info[slot].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 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_VALIDATE; 266 } 267 } 268 269 return cam_changed; 270 } 271 272 273 /** 274 * dvb_ca_en50221_wait_if_status - Wait for flags to become set on the STATUS 275 * register on a CAM interface, checking for errors and timeout. 276 * 277 * @ca: CA instance. 278 * @slot: Slot on interface. 279 * @waitfor: Flags to wait for. 280 * @timeout_ms: Timeout in milliseconds. 281 * 282 * @return 0 on success, nonzero on error. 283 */ 284 static int dvb_ca_en50221_wait_if_status(struct dvb_ca_private *ca, int slot, 285 u8 waitfor, int timeout_hz) 286 { 287 unsigned long timeout; 288 unsigned long start; 289 290 dprintk("%s\n", __func__); 291 292 /* loop until timeout elapsed */ 293 start = jiffies; 294 timeout = jiffies + timeout_hz; 295 while (1) { 296 /* read the status and check for error */ 297 int res = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS); 298 if (res < 0) 299 return -EIO; 300 301 /* if we got the flags, it was successful! */ 302 if (res & waitfor) { 303 dprintk("%s succeeded timeout:%lu\n", 304 __func__, jiffies - start); 305 return 0; 306 } 307 308 /* check for timeout */ 309 if (time_after(jiffies, timeout)) { 310 break; 311 } 312 313 /* wait for a bit */ 314 msleep(1); 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 /** 325 * dvb_ca_en50221_link_init - Initialise the link layer connection to a CAM. 326 * 327 * @ca: CA instance. 328 * @slot: Slot id. 329 * 330 * @return 0 on success, nonzero on failure. 331 */ 332 static int dvb_ca_en50221_link_init(struct dvb_ca_private *ca, int slot) 333 { 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 ca->slot_info[slot].da_irq_supported = 0; 342 343 /* set the host link buffer size temporarily. it will be overwritten with the 344 * real negotiated size later. */ 345 ca->slot_info[slot].link_buf_size = 2; 346 347 /* read the buffer size from the CAM */ 348 if ((ret = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, IRQEN | CMDREG_SR)) != 0) 349 return ret; 350 if ((ret = dvb_ca_en50221_wait_if_status(ca, slot, STATUSREG_DA, HZ / 10)) != 0) 351 return ret; 352 if ((ret = dvb_ca_en50221_read_data(ca, slot, buf, 2)) != 2) 353 return -EIO; 354 if ((ret = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, IRQEN)) != 0) 355 return ret; 356 357 /* store it, and choose the minimum of our buffer and the CAM's buffer size */ 358 buf_size = (buf[0] << 8) | buf[1]; 359 if (buf_size > HOST_LINK_BUF_SIZE) 360 buf_size = HOST_LINK_BUF_SIZE; 361 ca->slot_info[slot].link_buf_size = buf_size; 362 buf[0] = buf_size >> 8; 363 buf[1] = buf_size & 0xff; 364 dprintk("Chosen link buffer size of %i\n", buf_size); 365 366 /* write the buffer size to the CAM */ 367 if ((ret = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, IRQEN | CMDREG_SW)) != 0) 368 return ret; 369 if ((ret = dvb_ca_en50221_wait_if_status(ca, slot, STATUSREG_FR, HZ / 10)) != 0) 370 return ret; 371 if ((ret = dvb_ca_en50221_write_data(ca, slot, buf, 2)) != 2) 372 return -EIO; 373 if ((ret = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, IRQEN)) != 0) 374 return ret; 375 376 /* success */ 377 return 0; 378 } 379 380 /** 381 * dvb_ca_en50221_read_tuple - Read a tuple from attribute memory. 382 * 383 * @ca: CA instance. 384 * @slot: Slot id. 385 * @address: Address to read from. Updated. 386 * @tupleType: Tuple id byte. Updated. 387 * @tupleLength: Tuple length. Updated. 388 * @tuple: Dest buffer for tuple (must be 256 bytes). Updated. 389 * 390 * @return 0 on success, nonzero on error. 391 */ 392 static int dvb_ca_en50221_read_tuple(struct dvb_ca_private *ca, int slot, 393 int *address, int *tupleType, int *tupleLength, u8 * tuple) 394 { 395 int i; 396 int _tupleType; 397 int _tupleLength; 398 int _address = *address; 399 400 /* grab the next tuple length and type */ 401 if ((_tupleType = ca->pub->read_attribute_mem(ca->pub, slot, _address)) < 0) 402 return _tupleType; 403 if (_tupleType == 0xff) { 404 dprintk("END OF CHAIN TUPLE type:0x%x\n", _tupleType); 405 *address += 2; 406 *tupleType = _tupleType; 407 *tupleLength = 0; 408 return 0; 409 } 410 if ((_tupleLength = ca->pub->read_attribute_mem(ca->pub, slot, _address + 2)) < 0) 411 return _tupleLength; 412 _address += 4; 413 414 dprintk("TUPLE type:0x%x length:%i\n", _tupleType, _tupleLength); 415 416 /* read in the whole tuple */ 417 for (i = 0; i < _tupleLength; i++) { 418 tuple[i] = ca->pub->read_attribute_mem(ca->pub, slot, _address + (i * 2)); 419 dprintk(" 0x%02x: 0x%02x %c\n", 420 i, tuple[i] & 0xff, 421 ((tuple[i] > 31) && (tuple[i] < 127)) ? tuple[i] : '.'); 422 } 423 _address += (_tupleLength * 2); 424 425 // success 426 *tupleType = _tupleType; 427 *tupleLength = _tupleLength; 428 *address = _address; 429 return 0; 430 } 431 432 433 /** 434 * dvb_ca_en50221_parse_attributes - Parse attribute memory of a CAM module, 435 * extracting Config register, and checking it is a DVB CAM module. 436 * 437 * @ca: CA instance. 438 * @slot: Slot id. 439 * 440 * @return 0 on success, <0 on failure. 441 */ 442 static int dvb_ca_en50221_parse_attributes(struct dvb_ca_private *ca, int slot) 443 { 444 int address = 0; 445 int tupleLength; 446 int tupleType; 447 u8 tuple[257]; 448 char *dvb_str; 449 int rasz; 450 int status; 451 int got_cftableentry = 0; 452 int end_chain = 0; 453 int i; 454 u16 manfid = 0; 455 u16 devid = 0; 456 457 458 // CISTPL_DEVICE_0A 459 if ((status = 460 dvb_ca_en50221_read_tuple(ca, slot, &address, &tupleType, &tupleLength, tuple)) < 0) 461 return status; 462 if (tupleType != 0x1D) 463 return -EINVAL; 464 465 466 467 // CISTPL_DEVICE_0C 468 if ((status = 469 dvb_ca_en50221_read_tuple(ca, slot, &address, &tupleType, &tupleLength, tuple)) < 0) 470 return status; 471 if (tupleType != 0x1C) 472 return -EINVAL; 473 474 475 476 // CISTPL_VERS_1 477 if ((status = 478 dvb_ca_en50221_read_tuple(ca, slot, &address, &tupleType, &tupleLength, tuple)) < 0) 479 return status; 480 if (tupleType != 0x15) 481 return -EINVAL; 482 483 484 485 // CISTPL_MANFID 486 if ((status = dvb_ca_en50221_read_tuple(ca, slot, &address, &tupleType, 487 &tupleLength, tuple)) < 0) 488 return status; 489 if (tupleType != 0x20) 490 return -EINVAL; 491 if (tupleLength != 4) 492 return -EINVAL; 493 manfid = (tuple[1] << 8) | tuple[0]; 494 devid = (tuple[3] << 8) | tuple[2]; 495 496 497 498 // CISTPL_CONFIG 499 if ((status = dvb_ca_en50221_read_tuple(ca, slot, &address, &tupleType, 500 &tupleLength, tuple)) < 0) 501 return status; 502 if (tupleType != 0x1A) 503 return -EINVAL; 504 if (tupleLength < 3) 505 return -EINVAL; 506 507 /* extract the configbase */ 508 rasz = tuple[0] & 3; 509 if (tupleLength < (3 + rasz + 14)) 510 return -EINVAL; 511 ca->slot_info[slot].config_base = 0; 512 for (i = 0; i < rasz + 1; i++) { 513 ca->slot_info[slot].config_base |= (tuple[2 + i] << (8 * i)); 514 } 515 516 /* check it contains the correct DVB string */ 517 dvb_str = findstr((char *)tuple, tupleLength, "DVB_CI_V", 8); 518 if (dvb_str == NULL) 519 return -EINVAL; 520 if (tupleLength < ((dvb_str - (char *) tuple) + 12)) 521 return -EINVAL; 522 523 /* is it a version we support? */ 524 if (strncmp(dvb_str + 8, "1.00", 4)) { 525 pr_err("dvb_ca adapter %d: Unsupported DVB CAM module version %c%c%c%c\n", 526 ca->dvbdev->adapter->num, dvb_str[8], dvb_str[9], 527 dvb_str[10], dvb_str[11]); 528 return -EINVAL; 529 } 530 531 /* process the CFTABLE_ENTRY tuples, and any after those */ 532 while ((!end_chain) && (address < 0x1000)) { 533 if ((status = dvb_ca_en50221_read_tuple(ca, slot, &address, &tupleType, 534 &tupleLength, tuple)) < 0) 535 return status; 536 switch (tupleType) { 537 case 0x1B: // CISTPL_CFTABLE_ENTRY 538 if (tupleLength < (2 + 11 + 17)) 539 break; 540 541 /* if we've already parsed one, just use it */ 542 if (got_cftableentry) 543 break; 544 545 /* get the config option */ 546 ca->slot_info[slot].config_option = tuple[0] & 0x3f; 547 548 /* OK, check it contains the correct strings */ 549 if ((findstr((char *)tuple, tupleLength, "DVB_HOST", 8) == NULL) || 550 (findstr((char *)tuple, tupleLength, "DVB_CI_MODULE", 13) == NULL)) 551 break; 552 553 got_cftableentry = 1; 554 break; 555 556 case 0x14: // CISTPL_NO_LINK 557 break; 558 559 case 0xFF: // CISTPL_END 560 end_chain = 1; 561 break; 562 563 default: /* Unknown tuple type - just skip this tuple and move to the next one */ 564 dprintk("dvb_ca: Skipping unknown tuple type:0x%x length:0x%x\n", 565 tupleType, tupleLength); 566 break; 567 } 568 } 569 570 if ((address > 0x1000) || (!got_cftableentry)) 571 return -EINVAL; 572 573 dprintk("Valid DVB CAM detected MANID:%x DEVID:%x CONFIGBASE:0x%x CONFIGOPTION:0x%x\n", 574 manfid, devid, ca->slot_info[slot].config_base, 575 ca->slot_info[slot].config_option); 576 577 // success! 578 return 0; 579 } 580 581 582 /** 583 * dvb_ca_en50221_set_configoption - Set CAM's configoption correctly. 584 * 585 * @ca: CA instance. 586 * @slot: Slot containing the CAM. 587 */ 588 static int dvb_ca_en50221_set_configoption(struct dvb_ca_private *ca, int slot) 589 { 590 int configoption; 591 592 dprintk("%s\n", __func__); 593 594 /* set the config option */ 595 ca->pub->write_attribute_mem(ca->pub, slot, 596 ca->slot_info[slot].config_base, 597 ca->slot_info[slot].config_option); 598 599 /* check it */ 600 configoption = ca->pub->read_attribute_mem(ca->pub, slot, ca->slot_info[slot].config_base); 601 dprintk("Set configoption 0x%x, read configoption 0x%x\n", 602 ca->slot_info[slot].config_option, configoption & 0x3f); 603 604 /* fine! */ 605 return 0; 606 607 } 608 609 610 /** 611 * dvb_ca_en50221_read_data - This function talks to an EN50221 CAM control 612 * interface. It reads a buffer of data from the CAM. The data can either 613 * be stored in a supplied buffer, or automatically be added to the slot's 614 * rx_buffer. 615 * 616 * @ca: CA instance. 617 * @slot: Slot to read from. 618 * @ebuf: If non-NULL, the data will be written to this buffer. If NULL, 619 * the data will be added into the buffering system as a normal fragment. 620 * @ecount: Size of ebuf. Ignored if ebuf is NULL. 621 * 622 * @return Number of bytes read, or < 0 on error 623 */ 624 static int dvb_ca_en50221_read_data(struct dvb_ca_private *ca, int slot, u8 * ebuf, int ecount) 625 { 626 int bytes_read; 627 int status; 628 u8 buf[HOST_LINK_BUF_SIZE]; 629 int i; 630 631 dprintk("%s\n", __func__); 632 633 /* check if we have space for a link buf in the rx_buffer */ 634 if (ebuf == NULL) { 635 int buf_free; 636 637 if (ca->slot_info[slot].rx_buffer.data == NULL) { 638 status = -EIO; 639 goto exit; 640 } 641 buf_free = dvb_ringbuffer_free(&ca->slot_info[slot].rx_buffer); 642 643 if (buf_free < (ca->slot_info[slot].link_buf_size + DVB_RINGBUFFER_PKTHDRSIZE)) { 644 status = -EAGAIN; 645 goto exit; 646 } 647 } 648 649 /* check if there is data available */ 650 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS)) < 0) 651 goto exit; 652 if (!(status & STATUSREG_DA)) { 653 /* no data */ 654 status = 0; 655 goto exit; 656 } 657 658 /* read the amount of data */ 659 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_SIZE_HIGH)) < 0) 660 goto exit; 661 bytes_read = status << 8; 662 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_SIZE_LOW)) < 0) 663 goto exit; 664 bytes_read |= status; 665 666 /* check it will fit */ 667 if (ebuf == NULL) { 668 if (bytes_read > ca->slot_info[slot].link_buf_size) { 669 pr_err("dvb_ca adapter %d: CAM tried to send a buffer larger than the link buffer size (%i > %i)!\n", 670 ca->dvbdev->adapter->num, bytes_read, 671 ca->slot_info[slot].link_buf_size); 672 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_LINKINIT; 673 status = -EIO; 674 goto exit; 675 } 676 if (bytes_read < 2) { 677 pr_err("dvb_ca adapter %d: CAM sent a buffer that was less than 2 bytes!\n", 678 ca->dvbdev->adapter->num); 679 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_LINKINIT; 680 status = -EIO; 681 goto exit; 682 } 683 } else { 684 if (bytes_read > ecount) { 685 pr_err("dvb_ca adapter %d: CAM tried to send a buffer larger than the ecount size!\n", 686 ca->dvbdev->adapter->num); 687 status = -EIO; 688 goto exit; 689 } 690 } 691 692 /* fill the buffer */ 693 for (i = 0; i < bytes_read; i++) { 694 /* read byte and check */ 695 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_DATA)) < 0) 696 goto exit; 697 698 /* OK, store it in the buffer */ 699 buf[i] = status; 700 } 701 702 /* check for read error (RE should now be 0) */ 703 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS)) < 0) 704 goto exit; 705 if (status & STATUSREG_RE) { 706 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_LINKINIT; 707 status = -EIO; 708 goto exit; 709 } 710 711 /* OK, add it to the receive buffer, or copy into external buffer if supplied */ 712 if (ebuf == NULL) { 713 if (ca->slot_info[slot].rx_buffer.data == NULL) { 714 status = -EIO; 715 goto exit; 716 } 717 dvb_ringbuffer_pkt_write(&ca->slot_info[slot].rx_buffer, buf, bytes_read); 718 } else { 719 memcpy(ebuf, buf, bytes_read); 720 } 721 722 dprintk("Received CA packet for slot %i connection id 0x%x last_frag:%i size:0x%x\n", slot, 723 buf[0], (buf[1] & 0x80) == 0, bytes_read); 724 725 /* wake up readers when a last_fragment is received */ 726 if ((buf[1] & 0x80) == 0x00) { 727 wake_up_interruptible(&ca->wait_queue); 728 } 729 status = bytes_read; 730 731 exit: 732 return status; 733 } 734 735 736 /** 737 * dvb_ca_en50221_write_data - This function talks to an EN50221 CAM control 738 * interface. It writes a buffer of data to a CAM. 739 * 740 * @ca: CA instance. 741 * @slot: Slot to write to. 742 * @ebuf: The data in this buffer is treated as a complete link-level packet to 743 * be written. 744 * @count: Size of ebuf. 745 * 746 * @return Number of bytes written, or < 0 on error. 747 */ 748 static int dvb_ca_en50221_write_data(struct dvb_ca_private *ca, int slot, u8 * buf, int bytes_write) 749 { 750 int status; 751 int i; 752 753 dprintk("%s\n", __func__); 754 755 756 /* sanity check */ 757 if (bytes_write > ca->slot_info[slot].link_buf_size) 758 return -EINVAL; 759 760 /* it is possible we are dealing with a single buffer implementation, 761 thus if there is data available for read or if there is even a read 762 already in progress, we do nothing but awake the kernel thread to 763 process the data if necessary. */ 764 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS)) < 0) 765 goto exitnowrite; 766 if (status & (STATUSREG_DA | STATUSREG_RE)) { 767 if (status & STATUSREG_DA) 768 dvb_ca_en50221_thread_wakeup(ca); 769 770 status = -EAGAIN; 771 goto exitnowrite; 772 } 773 774 /* OK, set HC bit */ 775 if ((status = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, 776 IRQEN | CMDREG_HC)) != 0) 777 goto exit; 778 779 /* check if interface is still free */ 780 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS)) < 0) 781 goto exit; 782 if (!(status & STATUSREG_FR)) { 783 /* it wasn't free => try again later */ 784 status = -EAGAIN; 785 goto exit; 786 } 787 788 /* send the amount of data */ 789 if ((status = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_SIZE_HIGH, bytes_write >> 8)) != 0) 790 goto exit; 791 if ((status = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_SIZE_LOW, 792 bytes_write & 0xff)) != 0) 793 goto exit; 794 795 /* send the buffer */ 796 for (i = 0; i < bytes_write; i++) { 797 if ((status = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_DATA, buf[i])) != 0) 798 goto exit; 799 } 800 801 /* check for write error (WE should now be 0) */ 802 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS)) < 0) 803 goto exit; 804 if (status & STATUSREG_WE) { 805 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_LINKINIT; 806 status = -EIO; 807 goto exit; 808 } 809 status = bytes_write; 810 811 dprintk("Wrote CA packet for slot %i, connection id 0x%x last_frag:%i size:0x%x\n", slot, 812 buf[0], (buf[1] & 0x80) == 0, bytes_write); 813 814 exit: 815 ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, IRQEN); 816 817 exitnowrite: 818 return status; 819 } 820 EXPORT_SYMBOL(dvb_ca_en50221_camchange_irq); 821 822 823 824 /* ******************************************************************************** */ 825 /* EN50221 higher level functions */ 826 827 828 /** 829 * dvb_ca_en50221_camready_irq - A CAM has been removed => shut it down. 830 * 831 * @ca: CA instance. 832 * @slot: Slot to shut down. 833 */ 834 static int dvb_ca_en50221_slot_shutdown(struct dvb_ca_private *ca, int slot) 835 { 836 dprintk("%s\n", __func__); 837 838 ca->pub->slot_shutdown(ca->pub, slot); 839 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_NONE; 840 841 /* need to wake up all processes to check if they're now 842 trying to write to a defunct CAM */ 843 wake_up_interruptible(&ca->wait_queue); 844 845 dprintk("Slot %i shutdown\n", slot); 846 847 /* success */ 848 return 0; 849 } 850 EXPORT_SYMBOL(dvb_ca_en50221_camready_irq); 851 852 853 /** 854 * dvb_ca_en50221_camready_irq - A CAMCHANGE IRQ has occurred. 855 * 856 * @ca: CA instance. 857 * @slot: Slot concerned. 858 * @change_type: One of the DVB_CA_CAMCHANGE_* values. 859 */ 860 void dvb_ca_en50221_camchange_irq(struct dvb_ca_en50221 *pubca, int slot, int change_type) 861 { 862 struct dvb_ca_private *ca = pubca->private; 863 864 dprintk("CAMCHANGE IRQ slot:%i change_type:%i\n", slot, change_type); 865 866 switch (change_type) { 867 case DVB_CA_EN50221_CAMCHANGE_REMOVED: 868 case DVB_CA_EN50221_CAMCHANGE_INSERTED: 869 break; 870 871 default: 872 return; 873 } 874 875 ca->slot_info[slot].camchange_type = change_type; 876 atomic_inc(&ca->slot_info[slot].camchange_count); 877 dvb_ca_en50221_thread_wakeup(ca); 878 } 879 EXPORT_SYMBOL(dvb_ca_en50221_frda_irq); 880 881 882 /** 883 * dvb_ca_en50221_camready_irq - A CAMREADY IRQ has occurred. 884 * 885 * @ca: CA instance. 886 * @slot: Slot concerned. 887 */ 888 void dvb_ca_en50221_camready_irq(struct dvb_ca_en50221 *pubca, int slot) 889 { 890 struct dvb_ca_private *ca = pubca->private; 891 892 dprintk("CAMREADY IRQ slot:%i\n", slot); 893 894 if (ca->slot_info[slot].slot_state == DVB_CA_SLOTSTATE_WAITREADY) { 895 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_VALIDATE; 896 dvb_ca_en50221_thread_wakeup(ca); 897 } 898 } 899 900 901 /** 902 * An FR or DA IRQ has occurred. 903 * 904 * @ca: CA instance. 905 * @slot: Slot concerned. 906 */ 907 void dvb_ca_en50221_frda_irq(struct dvb_ca_en50221 *pubca, int slot) 908 { 909 struct dvb_ca_private *ca = pubca->private; 910 int flags; 911 912 dprintk("FR/DA IRQ slot:%i\n", slot); 913 914 switch (ca->slot_info[slot].slot_state) { 915 case DVB_CA_SLOTSTATE_LINKINIT: 916 flags = ca->pub->read_cam_control(pubca, slot, CTRLIF_STATUS); 917 if (flags & STATUSREG_DA) { 918 dprintk("CAM supports DA IRQ\n"); 919 ca->slot_info[slot].da_irq_supported = 1; 920 } 921 break; 922 923 case DVB_CA_SLOTSTATE_RUNNING: 924 if (ca->open) 925 dvb_ca_en50221_thread_wakeup(ca); 926 break; 927 } 928 } 929 930 931 932 /* ******************************************************************************** */ 933 /* EN50221 thread functions */ 934 935 /** 936 * Wake up the DVB CA thread 937 * 938 * @ca: CA instance. 939 */ 940 static void dvb_ca_en50221_thread_wakeup(struct dvb_ca_private *ca) 941 { 942 943 dprintk("%s\n", __func__); 944 945 ca->wakeup = 1; 946 mb(); 947 wake_up_process(ca->thread); 948 } 949 950 /** 951 * Update the delay used by the thread. 952 * 953 * @ca: CA instance. 954 */ 955 static void dvb_ca_en50221_thread_update_delay(struct dvb_ca_private *ca) 956 { 957 int delay; 958 int curdelay = 100000000; 959 int slot; 960 961 /* Beware of too high polling frequency, because one polling 962 * call might take several hundred milliseconds until timeout! 963 */ 964 for (slot = 0; slot < ca->slot_count; slot++) { 965 switch (ca->slot_info[slot].slot_state) { 966 default: 967 case DVB_CA_SLOTSTATE_NONE: 968 delay = HZ * 60; /* 60s */ 969 if (!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE)) 970 delay = HZ * 5; /* 5s */ 971 break; 972 case DVB_CA_SLOTSTATE_INVALID: 973 delay = HZ * 60; /* 60s */ 974 if (!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE)) 975 delay = HZ / 10; /* 100ms */ 976 break; 977 978 case DVB_CA_SLOTSTATE_UNINITIALISED: 979 case DVB_CA_SLOTSTATE_WAITREADY: 980 case DVB_CA_SLOTSTATE_VALIDATE: 981 case DVB_CA_SLOTSTATE_WAITFR: 982 case DVB_CA_SLOTSTATE_LINKINIT: 983 delay = HZ / 10; /* 100ms */ 984 break; 985 986 case DVB_CA_SLOTSTATE_RUNNING: 987 delay = HZ * 60; /* 60s */ 988 if (!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE)) 989 delay = HZ / 10; /* 100ms */ 990 if (ca->open) { 991 if ((!ca->slot_info[slot].da_irq_supported) || 992 (!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_DA))) 993 delay = HZ / 10; /* 100ms */ 994 } 995 break; 996 } 997 998 if (delay < curdelay) 999 curdelay = delay; 1000 } 1001 1002 ca->delay = curdelay; 1003 } 1004 1005 1006 1007 /** 1008 * Kernel thread which monitors CA slots for CAM changes, and performs data transfers. 1009 */ 1010 static int dvb_ca_en50221_thread(void *data) 1011 { 1012 struct dvb_ca_private *ca = data; 1013 int slot; 1014 int flags; 1015 int status; 1016 int pktcount; 1017 void *rxbuf; 1018 1019 dprintk("%s\n", __func__); 1020 1021 /* choose the correct initial delay */ 1022 dvb_ca_en50221_thread_update_delay(ca); 1023 1024 /* main loop */ 1025 while (!kthread_should_stop()) { 1026 /* sleep for a bit */ 1027 if (!ca->wakeup) { 1028 set_current_state(TASK_INTERRUPTIBLE); 1029 schedule_timeout(ca->delay); 1030 if (kthread_should_stop()) 1031 return 0; 1032 } 1033 ca->wakeup = 0; 1034 1035 /* go through all the slots processing them */ 1036 for (slot = 0; slot < ca->slot_count; slot++) { 1037 1038 mutex_lock(&ca->slot_info[slot].slot_lock); 1039 1040 // check the cam status + deal with CAMCHANGEs 1041 while (dvb_ca_en50221_check_camstatus(ca, slot)) { 1042 /* clear down an old CI slot if necessary */ 1043 if (ca->slot_info[slot].slot_state != DVB_CA_SLOTSTATE_NONE) 1044 dvb_ca_en50221_slot_shutdown(ca, slot); 1045 1046 /* if a CAM is NOW present, initialise it */ 1047 if (ca->slot_info[slot].camchange_type == DVB_CA_EN50221_CAMCHANGE_INSERTED) { 1048 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_UNINITIALISED; 1049 } 1050 1051 /* we've handled one CAMCHANGE */ 1052 dvb_ca_en50221_thread_update_delay(ca); 1053 atomic_dec(&ca->slot_info[slot].camchange_count); 1054 } 1055 1056 // CAM state machine 1057 switch (ca->slot_info[slot].slot_state) { 1058 case DVB_CA_SLOTSTATE_NONE: 1059 case DVB_CA_SLOTSTATE_INVALID: 1060 // no action needed 1061 break; 1062 1063 case DVB_CA_SLOTSTATE_UNINITIALISED: 1064 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_WAITREADY; 1065 ca->pub->slot_reset(ca->pub, slot); 1066 ca->slot_info[slot].timeout = jiffies + (INIT_TIMEOUT_SECS * HZ); 1067 break; 1068 1069 case DVB_CA_SLOTSTATE_WAITREADY: 1070 if (time_after(jiffies, ca->slot_info[slot].timeout)) { 1071 pr_err("dvb_ca adaptor %d: PC card did not respond :(\n", 1072 ca->dvbdev->adapter->num); 1073 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID; 1074 dvb_ca_en50221_thread_update_delay(ca); 1075 break; 1076 } 1077 // no other action needed; will automatically change state when ready 1078 break; 1079 1080 case DVB_CA_SLOTSTATE_VALIDATE: 1081 if (dvb_ca_en50221_parse_attributes(ca, slot) != 0) { 1082 /* we need this extra check for annoying interfaces like the budget-av */ 1083 if ((!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE)) && 1084 (ca->pub->poll_slot_status)) { 1085 status = ca->pub->poll_slot_status(ca->pub, slot, 0); 1086 if (!(status & DVB_CA_EN50221_POLL_CAM_PRESENT)) { 1087 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_NONE; 1088 dvb_ca_en50221_thread_update_delay(ca); 1089 break; 1090 } 1091 } 1092 1093 pr_err("dvb_ca adapter %d: Invalid PC card inserted :(\n", 1094 ca->dvbdev->adapter->num); 1095 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID; 1096 dvb_ca_en50221_thread_update_delay(ca); 1097 break; 1098 } 1099 if (dvb_ca_en50221_set_configoption(ca, slot) != 0) { 1100 pr_err("dvb_ca adapter %d: Unable to initialise CAM :(\n", 1101 ca->dvbdev->adapter->num); 1102 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID; 1103 dvb_ca_en50221_thread_update_delay(ca); 1104 break; 1105 } 1106 if (ca->pub->write_cam_control(ca->pub, slot, 1107 CTRLIF_COMMAND, CMDREG_RS) != 0) { 1108 pr_err("dvb_ca adapter %d: Unable to reset CAM IF\n", 1109 ca->dvbdev->adapter->num); 1110 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID; 1111 dvb_ca_en50221_thread_update_delay(ca); 1112 break; 1113 } 1114 dprintk("DVB CAM validated successfully\n"); 1115 1116 ca->slot_info[slot].timeout = jiffies + (INIT_TIMEOUT_SECS * HZ); 1117 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_WAITFR; 1118 ca->wakeup = 1; 1119 break; 1120 1121 case DVB_CA_SLOTSTATE_WAITFR: 1122 if (time_after(jiffies, ca->slot_info[slot].timeout)) { 1123 pr_err("dvb_ca adapter %d: DVB CAM did not respond :(\n", 1124 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 1130 flags = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS); 1131 if (flags & STATUSREG_FR) { 1132 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_LINKINIT; 1133 ca->wakeup = 1; 1134 } 1135 break; 1136 1137 case DVB_CA_SLOTSTATE_LINKINIT: 1138 if (dvb_ca_en50221_link_init(ca, slot) != 0) { 1139 /* we need this extra check for annoying interfaces like the budget-av */ 1140 if ((!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE)) && 1141 (ca->pub->poll_slot_status)) { 1142 status = ca->pub->poll_slot_status(ca->pub, slot, 0); 1143 if (!(status & DVB_CA_EN50221_POLL_CAM_PRESENT)) { 1144 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_NONE; 1145 dvb_ca_en50221_thread_update_delay(ca); 1146 break; 1147 } 1148 } 1149 1150 pr_err("dvb_ca adapter %d: DVB CAM link initialisation failed :(\n", 1151 ca->dvbdev->adapter->num); 1152 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID; 1153 dvb_ca_en50221_thread_update_delay(ca); 1154 break; 1155 } 1156 1157 if (ca->slot_info[slot].rx_buffer.data == NULL) { 1158 rxbuf = vmalloc(RX_BUFFER_SIZE); 1159 if (rxbuf == NULL) { 1160 pr_err("dvb_ca adapter %d: Unable to allocate CAM rx buffer :(\n", 1161 ca->dvbdev->adapter->num); 1162 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID; 1163 dvb_ca_en50221_thread_update_delay(ca); 1164 break; 1165 } 1166 dvb_ringbuffer_init(&ca->slot_info[slot].rx_buffer, rxbuf, RX_BUFFER_SIZE); 1167 } 1168 1169 ca->pub->slot_ts_enable(ca->pub, slot); 1170 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_RUNNING; 1171 dvb_ca_en50221_thread_update_delay(ca); 1172 pr_err("dvb_ca adapter %d: DVB CAM detected and initialised successfully\n", 1173 ca->dvbdev->adapter->num); 1174 break; 1175 1176 case DVB_CA_SLOTSTATE_RUNNING: 1177 if (!ca->open) 1178 break; 1179 1180 // poll slots for data 1181 pktcount = 0; 1182 while ((status = dvb_ca_en50221_read_data(ca, slot, NULL, 0)) > 0) { 1183 if (!ca->open) 1184 break; 1185 1186 /* if a CAMCHANGE occurred at some point, do not do any more processing of this slot */ 1187 if (dvb_ca_en50221_check_camstatus(ca, slot)) { 1188 // we dont want to sleep on the next iteration so we can handle the cam change 1189 ca->wakeup = 1; 1190 break; 1191 } 1192 1193 /* check if we've hit our limit this time */ 1194 if (++pktcount >= MAX_RX_PACKETS_PER_ITERATION) { 1195 // dont sleep; there is likely to be more data to read 1196 ca->wakeup = 1; 1197 break; 1198 } 1199 } 1200 break; 1201 } 1202 1203 mutex_unlock(&ca->slot_info[slot].slot_lock); 1204 } 1205 } 1206 1207 return 0; 1208 } 1209 1210 1211 1212 /* ******************************************************************************** */ 1213 /* EN50221 IO interface functions */ 1214 1215 /** 1216 * Real ioctl implementation. 1217 * NOTE: CA_SEND_MSG/CA_GET_MSG ioctls have userspace buffers passed to them. 1218 * 1219 * @inode: Inode concerned. 1220 * @file: File concerned. 1221 * @cmd: IOCTL command. 1222 * @arg: Associated argument. 1223 * 1224 * @return 0 on success, <0 on error. 1225 */ 1226 static int dvb_ca_en50221_io_do_ioctl(struct file *file, 1227 unsigned int cmd, void *parg) 1228 { 1229 struct dvb_device *dvbdev = file->private_data; 1230 struct dvb_ca_private *ca = dvbdev->priv; 1231 int err = 0; 1232 int slot; 1233 1234 dprintk("%s\n", __func__); 1235 1236 if (mutex_lock_interruptible(&ca->ioctl_mutex)) 1237 return -ERESTARTSYS; 1238 1239 switch (cmd) { 1240 case CA_RESET: 1241 for (slot = 0; slot < ca->slot_count; slot++) { 1242 mutex_lock(&ca->slot_info[slot].slot_lock); 1243 if (ca->slot_info[slot].slot_state != DVB_CA_SLOTSTATE_NONE) { 1244 dvb_ca_en50221_slot_shutdown(ca, slot); 1245 if (ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE) 1246 dvb_ca_en50221_camchange_irq(ca->pub, 1247 slot, 1248 DVB_CA_EN50221_CAMCHANGE_INSERTED); 1249 } 1250 mutex_unlock(&ca->slot_info[slot].slot_lock); 1251 } 1252 ca->next_read_slot = 0; 1253 dvb_ca_en50221_thread_wakeup(ca); 1254 break; 1255 1256 case CA_GET_CAP: { 1257 struct ca_caps *caps = parg; 1258 1259 caps->slot_num = ca->slot_count; 1260 caps->slot_type = CA_CI_LINK; 1261 caps->descr_num = 0; 1262 caps->descr_type = 0; 1263 break; 1264 } 1265 1266 case CA_GET_SLOT_INFO: { 1267 struct ca_slot_info *info = parg; 1268 1269 if ((info->num > ca->slot_count) || (info->num < 0)) { 1270 err = -EINVAL; 1271 goto out_unlock; 1272 } 1273 1274 info->type = CA_CI_LINK; 1275 info->flags = 0; 1276 if ((ca->slot_info[info->num].slot_state != DVB_CA_SLOTSTATE_NONE) 1277 && (ca->slot_info[info->num].slot_state != DVB_CA_SLOTSTATE_INVALID)) { 1278 info->flags = CA_CI_MODULE_PRESENT; 1279 } 1280 if (ca->slot_info[info->num].slot_state == DVB_CA_SLOTSTATE_RUNNING) { 1281 info->flags |= CA_CI_MODULE_READY; 1282 } 1283 break; 1284 } 1285 1286 default: 1287 err = -EINVAL; 1288 break; 1289 } 1290 1291 out_unlock: 1292 mutex_unlock(&ca->ioctl_mutex); 1293 return err; 1294 } 1295 1296 1297 /** 1298 * Wrapper for ioctl implementation. 1299 * 1300 * @inode: Inode concerned. 1301 * @file: File concerned. 1302 * @cmd: IOCTL command. 1303 * @arg: Associated argument. 1304 * 1305 * @return 0 on success, <0 on error. 1306 */ 1307 static long dvb_ca_en50221_io_ioctl(struct file *file, 1308 unsigned int cmd, unsigned long arg) 1309 { 1310 return dvb_usercopy(file, cmd, arg, dvb_ca_en50221_io_do_ioctl); 1311 } 1312 1313 1314 /** 1315 * Implementation of write() syscall. 1316 * 1317 * @file: File structure. 1318 * @buf: Source buffer. 1319 * @count: Size of source buffer. 1320 * @ppos: Position in file (ignored). 1321 * 1322 * @return Number of bytes read, or <0 on error. 1323 */ 1324 static ssize_t dvb_ca_en50221_io_write(struct file *file, 1325 const char __user * buf, size_t count, loff_t * ppos) 1326 { 1327 struct dvb_device *dvbdev = file->private_data; 1328 struct dvb_ca_private *ca = dvbdev->priv; 1329 u8 slot, connection_id; 1330 int status; 1331 u8 fragbuf[HOST_LINK_BUF_SIZE]; 1332 int fragpos = 0; 1333 int fraglen; 1334 unsigned long timeout; 1335 int written; 1336 1337 dprintk("%s\n", __func__); 1338 1339 /* Incoming packet has a 2 byte header. hdr[0] = slot_id, hdr[1] = connection_id */ 1340 if (count < 2) 1341 return -EINVAL; 1342 1343 /* extract slot & connection id */ 1344 if (copy_from_user(&slot, buf, 1)) 1345 return -EFAULT; 1346 if (copy_from_user(&connection_id, buf + 1, 1)) 1347 return -EFAULT; 1348 buf += 2; 1349 count -= 2; 1350 1351 /* check if the slot is actually running */ 1352 if (ca->slot_info[slot].slot_state != DVB_CA_SLOTSTATE_RUNNING) 1353 return -EINVAL; 1354 1355 /* fragment the packets & store in the buffer */ 1356 while (fragpos < count) { 1357 fraglen = ca->slot_info[slot].link_buf_size - 2; 1358 if (fraglen < 0) 1359 break; 1360 if (fraglen > HOST_LINK_BUF_SIZE - 2) 1361 fraglen = HOST_LINK_BUF_SIZE - 2; 1362 if ((count - fragpos) < fraglen) 1363 fraglen = count - fragpos; 1364 1365 fragbuf[0] = connection_id; 1366 fragbuf[1] = ((fragpos + fraglen) < count) ? 0x80 : 0x00; 1367 status = copy_from_user(fragbuf + 2, buf + fragpos, fraglen); 1368 if (status) { 1369 status = -EFAULT; 1370 goto exit; 1371 } 1372 1373 timeout = jiffies + HZ / 2; 1374 written = 0; 1375 while (!time_after(jiffies, timeout)) { 1376 /* check the CAM hasn't been removed/reset in the meantime */ 1377 if (ca->slot_info[slot].slot_state != DVB_CA_SLOTSTATE_RUNNING) { 1378 status = -EIO; 1379 goto exit; 1380 } 1381 1382 mutex_lock(&ca->slot_info[slot].slot_lock); 1383 status = dvb_ca_en50221_write_data(ca, slot, fragbuf, fraglen + 2); 1384 mutex_unlock(&ca->slot_info[slot].slot_lock); 1385 if (status == (fraglen + 2)) { 1386 written = 1; 1387 break; 1388 } 1389 if (status != -EAGAIN) 1390 goto exit; 1391 1392 msleep(1); 1393 } 1394 if (!written) { 1395 status = -EIO; 1396 goto exit; 1397 } 1398 1399 fragpos += fraglen; 1400 } 1401 status = count + 2; 1402 1403 exit: 1404 return status; 1405 } 1406 1407 1408 /** 1409 * Condition for waking up in dvb_ca_en50221_io_read_condition 1410 */ 1411 static int dvb_ca_en50221_io_read_condition(struct dvb_ca_private *ca, 1412 int *result, int *_slot) 1413 { 1414 int slot; 1415 int slot_count = 0; 1416 int idx; 1417 size_t fraglen; 1418 int connection_id = -1; 1419 int found = 0; 1420 u8 hdr[2]; 1421 1422 slot = ca->next_read_slot; 1423 while ((slot_count < ca->slot_count) && (!found)) { 1424 if (ca->slot_info[slot].slot_state != DVB_CA_SLOTSTATE_RUNNING) 1425 goto nextslot; 1426 1427 if (ca->slot_info[slot].rx_buffer.data == NULL) { 1428 return 0; 1429 } 1430 1431 idx = dvb_ringbuffer_pkt_next(&ca->slot_info[slot].rx_buffer, -1, &fraglen); 1432 while (idx != -1) { 1433 dvb_ringbuffer_pkt_read(&ca->slot_info[slot].rx_buffer, idx, 0, hdr, 2); 1434 if (connection_id == -1) 1435 connection_id = hdr[0]; 1436 if ((hdr[0] == connection_id) && ((hdr[1] & 0x80) == 0)) { 1437 *_slot = slot; 1438 found = 1; 1439 break; 1440 } 1441 1442 idx = dvb_ringbuffer_pkt_next(&ca->slot_info[slot].rx_buffer, idx, &fraglen); 1443 } 1444 1445 nextslot: 1446 slot = (slot + 1) % ca->slot_count; 1447 slot_count++; 1448 } 1449 1450 ca->next_read_slot = slot; 1451 return found; 1452 } 1453 1454 1455 /** 1456 * Implementation of read() syscall. 1457 * 1458 * @file: File structure. 1459 * @buf: Destination buffer. 1460 * @count: Size of destination buffer. 1461 * @ppos: Position in file (ignored). 1462 * 1463 * @return Number of bytes read, or <0 on error. 1464 */ 1465 static ssize_t dvb_ca_en50221_io_read(struct file *file, char __user * buf, 1466 size_t count, loff_t * ppos) 1467 { 1468 struct dvb_device *dvbdev = file->private_data; 1469 struct dvb_ca_private *ca = dvbdev->priv; 1470 int status; 1471 int result = 0; 1472 u8 hdr[2]; 1473 int slot; 1474 int connection_id = -1; 1475 size_t idx, idx2; 1476 int last_fragment = 0; 1477 size_t fraglen; 1478 int pktlen; 1479 int dispose = 0; 1480 1481 dprintk("%s\n", __func__); 1482 1483 /* Outgoing packet has a 2 byte header. hdr[0] = slot_id, hdr[1] = connection_id */ 1484 if (count < 2) 1485 return -EINVAL; 1486 1487 /* wait for some data */ 1488 if ((status = dvb_ca_en50221_io_read_condition(ca, &result, &slot)) == 0) { 1489 1490 /* if we're in nonblocking mode, exit immediately */ 1491 if (file->f_flags & O_NONBLOCK) 1492 return -EWOULDBLOCK; 1493 1494 /* wait for some data */ 1495 status = wait_event_interruptible(ca->wait_queue, 1496 dvb_ca_en50221_io_read_condition 1497 (ca, &result, &slot)); 1498 } 1499 if ((status < 0) || (result < 0)) { 1500 if (result) 1501 return result; 1502 return status; 1503 } 1504 1505 idx = dvb_ringbuffer_pkt_next(&ca->slot_info[slot].rx_buffer, -1, &fraglen); 1506 pktlen = 2; 1507 do { 1508 if (idx == -1) { 1509 pr_err("dvb_ca adapter %d: BUG: read packet ended before last_fragment encountered\n", 1510 ca->dvbdev->adapter->num); 1511 status = -EIO; 1512 goto exit; 1513 } 1514 1515 dvb_ringbuffer_pkt_read(&ca->slot_info[slot].rx_buffer, idx, 0, hdr, 2); 1516 if (connection_id == -1) 1517 connection_id = hdr[0]; 1518 if (hdr[0] == connection_id) { 1519 if (pktlen < count) { 1520 if ((pktlen + fraglen - 2) > count) { 1521 fraglen = count - pktlen; 1522 } else { 1523 fraglen -= 2; 1524 } 1525 1526 if ((status = dvb_ringbuffer_pkt_read_user(&ca->slot_info[slot].rx_buffer, idx, 2, 1527 buf + pktlen, fraglen)) < 0) { 1528 goto exit; 1529 } 1530 pktlen += fraglen; 1531 } 1532 1533 if ((hdr[1] & 0x80) == 0) 1534 last_fragment = 1; 1535 dispose = 1; 1536 } 1537 1538 idx2 = dvb_ringbuffer_pkt_next(&ca->slot_info[slot].rx_buffer, idx, &fraglen); 1539 if (dispose) 1540 dvb_ringbuffer_pkt_dispose(&ca->slot_info[slot].rx_buffer, idx); 1541 idx = idx2; 1542 dispose = 0; 1543 } while (!last_fragment); 1544 1545 hdr[0] = slot; 1546 hdr[1] = connection_id; 1547 status = copy_to_user(buf, hdr, 2); 1548 if (status) { 1549 status = -EFAULT; 1550 goto exit; 1551 } 1552 status = pktlen; 1553 1554 exit: 1555 return status; 1556 } 1557 1558 1559 /** 1560 * Implementation of file open syscall. 1561 * 1562 * @inode: Inode concerned. 1563 * @file: File concerned. 1564 * 1565 * @return 0 on success, <0 on failure. 1566 */ 1567 static int dvb_ca_en50221_io_open(struct inode *inode, struct file *file) 1568 { 1569 struct dvb_device *dvbdev = file->private_data; 1570 struct dvb_ca_private *ca = dvbdev->priv; 1571 int err; 1572 int i; 1573 1574 dprintk("%s\n", __func__); 1575 1576 if (!try_module_get(ca->pub->owner)) 1577 return -EIO; 1578 1579 err = dvb_generic_open(inode, file); 1580 if (err < 0) { 1581 module_put(ca->pub->owner); 1582 return err; 1583 } 1584 1585 for (i = 0; i < ca->slot_count; i++) { 1586 1587 if (ca->slot_info[i].slot_state == DVB_CA_SLOTSTATE_RUNNING) { 1588 if (ca->slot_info[i].rx_buffer.data != NULL) { 1589 /* it is safe to call this here without locks because 1590 * ca->open == 0. Data is not read in this case */ 1591 dvb_ringbuffer_flush(&ca->slot_info[i].rx_buffer); 1592 } 1593 } 1594 } 1595 1596 ca->open = 1; 1597 dvb_ca_en50221_thread_update_delay(ca); 1598 dvb_ca_en50221_thread_wakeup(ca); 1599 1600 dvb_ca_private_get(ca); 1601 1602 return 0; 1603 } 1604 1605 1606 /** 1607 * Implementation of file close syscall. 1608 * 1609 * @inode: Inode concerned. 1610 * @file: File concerned. 1611 * 1612 * @return 0 on success, <0 on failure. 1613 */ 1614 static int dvb_ca_en50221_io_release(struct inode *inode, struct file *file) 1615 { 1616 struct dvb_device *dvbdev = file->private_data; 1617 struct dvb_ca_private *ca = dvbdev->priv; 1618 int err; 1619 1620 dprintk("%s\n", __func__); 1621 1622 /* mark the CA device as closed */ 1623 ca->open = 0; 1624 dvb_ca_en50221_thread_update_delay(ca); 1625 1626 err = dvb_generic_release(inode, file); 1627 1628 module_put(ca->pub->owner); 1629 1630 dvb_ca_private_put(ca); 1631 1632 return err; 1633 } 1634 1635 1636 /** 1637 * Implementation of poll() syscall. 1638 * 1639 * @file: File concerned. 1640 * @wait: poll wait table. 1641 * 1642 * @return Standard poll mask. 1643 */ 1644 static unsigned int dvb_ca_en50221_io_poll(struct file *file, poll_table * wait) 1645 { 1646 struct dvb_device *dvbdev = file->private_data; 1647 struct dvb_ca_private *ca = dvbdev->priv; 1648 unsigned int mask = 0; 1649 int slot; 1650 int result = 0; 1651 1652 dprintk("%s\n", __func__); 1653 1654 if (dvb_ca_en50221_io_read_condition(ca, &result, &slot) == 1) { 1655 mask |= POLLIN; 1656 } 1657 1658 /* if there is something, return now */ 1659 if (mask) 1660 return mask; 1661 1662 /* wait for something to happen */ 1663 poll_wait(file, &ca->wait_queue, wait); 1664 1665 if (dvb_ca_en50221_io_read_condition(ca, &result, &slot) == 1) { 1666 mask |= POLLIN; 1667 } 1668 1669 return mask; 1670 } 1671 EXPORT_SYMBOL(dvb_ca_en50221_init); 1672 1673 1674 static const struct file_operations dvb_ca_fops = { 1675 .owner = THIS_MODULE, 1676 .read = dvb_ca_en50221_io_read, 1677 .write = dvb_ca_en50221_io_write, 1678 .unlocked_ioctl = dvb_ca_en50221_io_ioctl, 1679 .open = dvb_ca_en50221_io_open, 1680 .release = dvb_ca_en50221_io_release, 1681 .poll = dvb_ca_en50221_io_poll, 1682 .llseek = noop_llseek, 1683 }; 1684 1685 static const struct dvb_device dvbdev_ca = { 1686 .priv = NULL, 1687 .users = 1, 1688 .readers = 1, 1689 .writers = 1, 1690 #if defined(CONFIG_MEDIA_CONTROLLER_DVB) 1691 .name = "dvb-ca-en50221", 1692 #endif 1693 .fops = &dvb_ca_fops, 1694 }; 1695 1696 /* ******************************************************************************** */ 1697 /* Initialisation/shutdown functions */ 1698 1699 1700 /** 1701 * Initialise a new DVB CA EN50221 interface device. 1702 * 1703 * @dvb_adapter: DVB adapter to attach the new CA device to. 1704 * @ca: The dvb_ca instance. 1705 * @flags: Flags describing the CA device (DVB_CA_FLAG_*). 1706 * @slot_count: Number of slots supported. 1707 * 1708 * @return 0 on success, nonzero on failure 1709 */ 1710 int dvb_ca_en50221_init(struct dvb_adapter *dvb_adapter, 1711 struct dvb_ca_en50221 *pubca, int flags, int slot_count) 1712 { 1713 int ret; 1714 struct dvb_ca_private *ca = NULL; 1715 int i; 1716 1717 dprintk("%s\n", __func__); 1718 1719 if (slot_count < 1) 1720 return -EINVAL; 1721 1722 /* initialise the system data */ 1723 if ((ca = kzalloc(sizeof(struct dvb_ca_private), GFP_KERNEL)) == NULL) { 1724 ret = -ENOMEM; 1725 goto exit; 1726 } 1727 kref_init(&ca->refcount); 1728 ca->pub = pubca; 1729 ca->flags = flags; 1730 ca->slot_count = slot_count; 1731 if ((ca->slot_info = kcalloc(slot_count, sizeof(struct dvb_ca_slot), GFP_KERNEL)) == NULL) { 1732 ret = -ENOMEM; 1733 goto free_ca; 1734 } 1735 init_waitqueue_head(&ca->wait_queue); 1736 ca->open = 0; 1737 ca->wakeup = 0; 1738 ca->next_read_slot = 0; 1739 pubca->private = ca; 1740 1741 /* register the DVB device */ 1742 ret = dvb_register_device(dvb_adapter, &ca->dvbdev, &dvbdev_ca, ca, DVB_DEVICE_CA, 0); 1743 if (ret) 1744 goto free_slot_info; 1745 1746 /* now initialise each slot */ 1747 for (i = 0; i < slot_count; i++) { 1748 memset(&ca->slot_info[i], 0, sizeof(struct dvb_ca_slot)); 1749 ca->slot_info[i].slot_state = DVB_CA_SLOTSTATE_NONE; 1750 atomic_set(&ca->slot_info[i].camchange_count, 0); 1751 ca->slot_info[i].camchange_type = DVB_CA_EN50221_CAMCHANGE_REMOVED; 1752 mutex_init(&ca->slot_info[i].slot_lock); 1753 } 1754 1755 mutex_init(&ca->ioctl_mutex); 1756 1757 if (signal_pending(current)) { 1758 ret = -EINTR; 1759 goto unregister_device; 1760 } 1761 mb(); 1762 1763 /* create a kthread for monitoring this CA device */ 1764 ca->thread = kthread_run(dvb_ca_en50221_thread, ca, "kdvb-ca-%i:%i", 1765 ca->dvbdev->adapter->num, ca->dvbdev->id); 1766 if (IS_ERR(ca->thread)) { 1767 ret = PTR_ERR(ca->thread); 1768 pr_err("dvb_ca_init: failed to start kernel_thread (%d)\n", 1769 ret); 1770 goto unregister_device; 1771 } 1772 return 0; 1773 1774 unregister_device: 1775 dvb_unregister_device(ca->dvbdev); 1776 free_slot_info: 1777 kfree(ca->slot_info); 1778 free_ca: 1779 kfree(ca); 1780 exit: 1781 pubca->private = NULL; 1782 return ret; 1783 } 1784 EXPORT_SYMBOL(dvb_ca_en50221_release); 1785 1786 1787 1788 /** 1789 * Release a DVB CA EN50221 interface device. 1790 * 1791 * @ca_dev: The dvb_device_t instance for the CA device. 1792 * @ca: The associated dvb_ca instance. 1793 */ 1794 void dvb_ca_en50221_release(struct dvb_ca_en50221 *pubca) 1795 { 1796 struct dvb_ca_private *ca = pubca->private; 1797 int i; 1798 1799 dprintk("%s\n", __func__); 1800 1801 /* shutdown the thread if there was one */ 1802 kthread_stop(ca->thread); 1803 1804 for (i = 0; i < ca->slot_count; i++) { 1805 dvb_ca_en50221_slot_shutdown(ca, i); 1806 } 1807 dvb_remove_device(ca->dvbdev); 1808 dvb_ca_private_put(ca); 1809 pubca->private = NULL; 1810 } 1811