1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * dvb_ca.c: generic DVB functions for EN50221 CAM interfaces 4 * 5 * Copyright (C) 2004 Andrew de Quincey 6 * 7 * Parts of this file were based on sources as follows: 8 * 9 * Copyright (C) 2003 Ralph Metzler <rjkm@metzlerbros.de> 10 * 11 * based on code: 12 * 13 * Copyright (C) 1999-2002 Ralph Metzler 14 * & Marcus Metzler for convergence integrated media GmbH 15 */ 16 17 #define pr_fmt(fmt) "dvb_ca_en50221: " fmt 18 19 #include <linux/errno.h> 20 #include <linux/slab.h> 21 #include <linux/list.h> 22 #include <linux/module.h> 23 #include <linux/nospec.h> 24 #include <linux/vmalloc.h> 25 #include <linux/delay.h> 26 #include <linux/spinlock.h> 27 #include <linux/sched/signal.h> 28 #include <linux/kthread.h> 29 30 #include <media/dvb_ca_en50221.h> 31 #include <media/dvb_ringbuffer.h> 32 33 static int dvb_ca_en50221_debug; 34 35 module_param_named(cam_debug, dvb_ca_en50221_debug, int, 0644); 36 MODULE_PARM_DESC(cam_debug, "enable verbose debug messages"); 37 38 #define dprintk(fmt, arg...) do { \ 39 if (dvb_ca_en50221_debug) \ 40 printk(KERN_DEBUG pr_fmt("%s: " fmt), __func__, ##arg);\ 41 } while (0) 42 43 #define INIT_TIMEOUT_SECS 10 44 45 #define HOST_LINK_BUF_SIZE 0x200 46 47 #define RX_BUFFER_SIZE 65535 48 49 #define MAX_RX_PACKETS_PER_ITERATION 10 50 51 #define CTRLIF_DATA 0 52 #define CTRLIF_COMMAND 1 53 #define CTRLIF_STATUS 1 54 #define CTRLIF_SIZE_LOW 2 55 #define CTRLIF_SIZE_HIGH 3 56 57 #define CMDREG_HC 1 /* Host control */ 58 #define CMDREG_SW 2 /* Size write */ 59 #define CMDREG_SR 4 /* Size read */ 60 #define CMDREG_RS 8 /* Reset interface */ 61 #define CMDREG_FRIE 0x40 /* Enable FR interrupt */ 62 #define CMDREG_DAIE 0x80 /* Enable DA interrupt */ 63 #define IRQEN (CMDREG_DAIE) 64 65 #define STATUSREG_RE 1 /* read error */ 66 #define STATUSREG_WE 2 /* write error */ 67 #define STATUSREG_FR 0x40 /* module free */ 68 #define STATUSREG_DA 0x80 /* data available */ 69 70 #define DVB_CA_SLOTSTATE_NONE 0 71 #define DVB_CA_SLOTSTATE_UNINITIALISED 1 72 #define DVB_CA_SLOTSTATE_RUNNING 2 73 #define DVB_CA_SLOTSTATE_INVALID 3 74 #define DVB_CA_SLOTSTATE_WAITREADY 4 75 #define DVB_CA_SLOTSTATE_VALIDATE 5 76 #define DVB_CA_SLOTSTATE_WAITFR 6 77 #define DVB_CA_SLOTSTATE_LINKINIT 7 78 79 /* Information on a CA slot */ 80 struct dvb_ca_slot { 81 /* current state of the CAM */ 82 int slot_state; 83 84 /* mutex used for serializing access to one CI slot */ 85 struct mutex slot_lock; 86 87 /* Number of CAMCHANGES that have occurred since last processing */ 88 atomic_t camchange_count; 89 90 /* Type of last CAMCHANGE */ 91 int camchange_type; 92 93 /* base address of CAM config */ 94 u32 config_base; 95 96 /* value to write into Config Control register */ 97 u8 config_option; 98 99 /* if 1, the CAM supports DA IRQs */ 100 u8 da_irq_supported:1; 101 102 /* size of the buffer to use when talking to the CAM */ 103 int link_buf_size; 104 105 /* buffer for incoming packets */ 106 struct dvb_ringbuffer rx_buffer; 107 108 /* timer used during various states of the slot */ 109 unsigned long timeout; 110 }; 111 112 /* Private CA-interface information */ 113 struct dvb_ca_private { 114 struct kref refcount; 115 116 /* pointer back to the public data structure */ 117 struct dvb_ca_en50221 *pub; 118 119 /* the DVB device */ 120 struct dvb_device *dvbdev; 121 122 /* Flags describing the interface (DVB_CA_FLAG_*) */ 123 u32 flags; 124 125 /* number of slots supported by this CA interface */ 126 unsigned int slot_count; 127 128 /* information on each slot */ 129 struct dvb_ca_slot *slot_info; 130 131 /* wait queues for read() and write() operations */ 132 wait_queue_head_t wait_queue; 133 134 /* PID of the monitoring thread */ 135 struct task_struct *thread; 136 137 /* Flag indicating if the CA device is open */ 138 unsigned int open:1; 139 140 /* Flag indicating the thread should wake up now */ 141 unsigned int wakeup:1; 142 143 /* Delay the main thread should use */ 144 unsigned long delay; 145 146 /* 147 * Slot to start looking for data to read from in the next user-space 148 * read operation 149 */ 150 int next_read_slot; 151 152 /* mutex serializing ioctls */ 153 struct mutex ioctl_mutex; 154 155 /* A mutex used when a device is disconnected */ 156 struct mutex remove_mutex; 157 158 /* Whether the device is disconnected */ 159 int exit; 160 }; 161 dvb_ca_private_free(struct dvb_ca_private * ca)162 static void dvb_ca_private_free(struct dvb_ca_private *ca) 163 { 164 unsigned int i; 165 166 dvb_device_put(ca->dvbdev); 167 for (i = 0; i < ca->slot_count; i++) 168 vfree(ca->slot_info[i].rx_buffer.data); 169 170 kfree(ca->slot_info); 171 kfree(ca); 172 } 173 dvb_ca_private_release(struct kref * ref)174 static void dvb_ca_private_release(struct kref *ref) 175 { 176 struct dvb_ca_private *ca; 177 178 ca = container_of(ref, struct dvb_ca_private, refcount); 179 dvb_ca_private_free(ca); 180 } 181 dvb_ca_private_get(struct dvb_ca_private * ca)182 static void dvb_ca_private_get(struct dvb_ca_private *ca) 183 { 184 kref_get(&ca->refcount); 185 } 186 dvb_ca_private_put(struct dvb_ca_private * ca)187 static void dvb_ca_private_put(struct dvb_ca_private *ca) 188 { 189 kref_put(&ca->refcount, dvb_ca_private_release); 190 } 191 192 static void dvb_ca_en50221_thread_wakeup(struct dvb_ca_private *ca); 193 static int dvb_ca_en50221_read_data(struct dvb_ca_private *ca, int slot, 194 u8 *ebuf, int ecount); 195 static int dvb_ca_en50221_write_data(struct dvb_ca_private *ca, int slot, 196 u8 *ebuf, int ecount, int size_write_flag); 197 198 /** 199 * findstr - Safely find needle in haystack. 200 * 201 * @haystack: Buffer to look in. 202 * @hlen: Number of bytes in haystack. 203 * @needle: Buffer to find. 204 * @nlen: Number of bytes in needle. 205 * return: Pointer into haystack needle was found at, or NULL if not found. 206 */ findstr(char * haystack,int hlen,char * needle,int nlen)207 static char *findstr(char *haystack, int hlen, char *needle, int nlen) 208 { 209 int i; 210 211 if (hlen < nlen) 212 return NULL; 213 214 for (i = 0; i <= hlen - nlen; i++) { 215 if (!strncmp(haystack + i, needle, nlen)) 216 return haystack + i; 217 } 218 219 return NULL; 220 } 221 222 /* ************************************************************************** */ 223 /* EN50221 physical interface functions */ 224 225 /* 226 * dvb_ca_en50221_check_camstatus - Check CAM status. 227 */ dvb_ca_en50221_check_camstatus(struct dvb_ca_private * ca,int slot)228 static int dvb_ca_en50221_check_camstatus(struct dvb_ca_private *ca, int slot) 229 { 230 struct dvb_ca_slot *sl = &ca->slot_info[slot]; 231 int slot_status; 232 int cam_present_now; 233 int cam_changed; 234 235 /* IRQ mode */ 236 if (ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE) 237 return (atomic_read(&sl->camchange_count) != 0); 238 239 /* poll mode */ 240 slot_status = ca->pub->poll_slot_status(ca->pub, slot, ca->open); 241 242 cam_present_now = (slot_status & DVB_CA_EN50221_POLL_CAM_PRESENT) ? 1 : 0; 243 cam_changed = (slot_status & DVB_CA_EN50221_POLL_CAM_CHANGED) ? 1 : 0; 244 if (!cam_changed) { 245 int cam_present_old = (sl->slot_state != DVB_CA_SLOTSTATE_NONE); 246 247 cam_changed = (cam_present_now != cam_present_old); 248 } 249 250 if (cam_changed) { 251 if (!cam_present_now) 252 sl->camchange_type = DVB_CA_EN50221_CAMCHANGE_REMOVED; 253 else 254 sl->camchange_type = DVB_CA_EN50221_CAMCHANGE_INSERTED; 255 atomic_set(&sl->camchange_count, 1); 256 } else { 257 if ((sl->slot_state == DVB_CA_SLOTSTATE_WAITREADY) && 258 (slot_status & DVB_CA_EN50221_POLL_CAM_READY)) { 259 /* move to validate state if reset is completed */ 260 sl->slot_state = DVB_CA_SLOTSTATE_VALIDATE; 261 } 262 } 263 264 return cam_changed; 265 } 266 267 /** 268 * dvb_ca_en50221_wait_if_status - Wait for flags to become set on the STATUS 269 * register on a CAM interface, checking for errors and timeout. 270 * 271 * @ca: CA instance. 272 * @slot: Slot on interface. 273 * @waitfor: Flags to wait for. 274 * @timeout_hz: Timeout in milliseconds. 275 * 276 * return: 0 on success, nonzero on error. 277 */ dvb_ca_en50221_wait_if_status(struct dvb_ca_private * ca,int slot,u8 waitfor,int timeout_hz)278 static int dvb_ca_en50221_wait_if_status(struct dvb_ca_private *ca, int slot, 279 u8 waitfor, int timeout_hz) 280 { 281 unsigned long timeout; 282 unsigned long start; 283 284 dprintk("%s\n", __func__); 285 286 /* loop until timeout elapsed */ 287 start = jiffies; 288 timeout = jiffies + timeout_hz; 289 while (1) { 290 int res; 291 292 /* read the status and check for error */ 293 res = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS); 294 if (res < 0) 295 return -EIO; 296 297 /* if we got the flags, it was successful! */ 298 if (res & waitfor) { 299 dprintk("%s succeeded timeout:%lu\n", 300 __func__, jiffies - start); 301 return 0; 302 } 303 304 /* check for timeout */ 305 if (time_after(jiffies, timeout)) 306 break; 307 308 /* wait for a bit */ 309 usleep_range(1000, 1100); 310 } 311 312 dprintk("%s failed timeout:%lu\n", __func__, jiffies - start); 313 314 /* if we get here, we've timed out */ 315 return -ETIMEDOUT; 316 } 317 318 /** 319 * dvb_ca_en50221_link_init - Initialise the link layer connection to a CAM. 320 * 321 * @ca: CA instance. 322 * @slot: Slot id. 323 * 324 * return: 0 on success, nonzero on failure. 325 */ dvb_ca_en50221_link_init(struct dvb_ca_private * ca,int slot)326 static int dvb_ca_en50221_link_init(struct dvb_ca_private *ca, int slot) 327 { 328 struct dvb_ca_slot *sl = &ca->slot_info[slot]; 329 int ret; 330 int buf_size; 331 u8 buf[2]; 332 333 dprintk("%s\n", __func__); 334 335 /* we'll be determining these during this function */ 336 sl->da_irq_supported = 0; 337 338 /* 339 * set the host link buffer size temporarily. it will be overwritten 340 * with the real negotiated size later. 341 */ 342 sl->link_buf_size = 2; 343 344 /* read the buffer size from the CAM */ 345 ret = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, 346 IRQEN | CMDREG_SR); 347 if (ret) 348 return ret; 349 ret = dvb_ca_en50221_wait_if_status(ca, slot, STATUSREG_DA, HZ); 350 if (ret) 351 return ret; 352 ret = dvb_ca_en50221_read_data(ca, slot, buf, 2); 353 if (ret != 2) 354 return -EIO; 355 ret = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, IRQEN); 356 if (ret) 357 return ret; 358 359 /* 360 * store it, and choose the minimum of our buffer and the CAM's buffer 361 * size 362 */ 363 buf_size = (buf[0] << 8) | buf[1]; 364 if (buf_size > HOST_LINK_BUF_SIZE) 365 buf_size = HOST_LINK_BUF_SIZE; 366 sl->link_buf_size = buf_size; 367 buf[0] = buf_size >> 8; 368 buf[1] = buf_size & 0xff; 369 dprintk("Chosen link buffer size of %i\n", buf_size); 370 371 /* write the buffer size to the CAM */ 372 ret = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, 373 IRQEN | CMDREG_SW); 374 if (ret) 375 return ret; 376 ret = dvb_ca_en50221_wait_if_status(ca, slot, STATUSREG_FR, HZ / 10); 377 if (ret) 378 return ret; 379 ret = dvb_ca_en50221_write_data(ca, slot, buf, 2, CMDREG_SW); 380 if (ret != 2) 381 return -EIO; 382 ret = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, IRQEN); 383 if (ret) 384 return ret; 385 386 /* success */ 387 return 0; 388 } 389 390 /** 391 * dvb_ca_en50221_read_tuple - Read a tuple from attribute memory. 392 * 393 * @ca: CA instance. 394 * @slot: Slot id. 395 * @address: Address to read from. Updated. 396 * @tuple_type: Tuple id byte. Updated. 397 * @tuple_length: Tuple length. Updated. 398 * @tuple: Dest buffer for tuple (must be 256 bytes). Updated. 399 * 400 * return: 0 on success, nonzero on error. 401 */ dvb_ca_en50221_read_tuple(struct dvb_ca_private * ca,int slot,int * address,int * tuple_type,int * tuple_length,u8 * tuple)402 static int dvb_ca_en50221_read_tuple(struct dvb_ca_private *ca, int slot, 403 int *address, int *tuple_type, 404 int *tuple_length, u8 *tuple) 405 { 406 int i; 407 int _tuple_type; 408 int _tuple_length; 409 int _address = *address; 410 411 /* grab the next tuple length and type */ 412 _tuple_type = ca->pub->read_attribute_mem(ca->pub, slot, _address); 413 if (_tuple_type < 0) 414 return _tuple_type; 415 if (_tuple_type == 0xff) { 416 dprintk("END OF CHAIN TUPLE type:0x%x\n", _tuple_type); 417 *address += 2; 418 *tuple_type = _tuple_type; 419 *tuple_length = 0; 420 return 0; 421 } 422 _tuple_length = ca->pub->read_attribute_mem(ca->pub, slot, 423 _address + 2); 424 if (_tuple_length < 0) 425 return _tuple_length; 426 _address += 4; 427 428 dprintk("TUPLE type:0x%x length:%i\n", _tuple_type, _tuple_length); 429 430 /* read in the whole tuple */ 431 for (i = 0; i < _tuple_length; i++) { 432 tuple[i] = ca->pub->read_attribute_mem(ca->pub, slot, 433 _address + (i * 2)); 434 dprintk(" 0x%02x: 0x%02x %c\n", 435 i, tuple[i] & 0xff, 436 ((tuple[i] > 31) && (tuple[i] < 127)) ? tuple[i] : '.'); 437 } 438 _address += (_tuple_length * 2); 439 440 /* success */ 441 *tuple_type = _tuple_type; 442 *tuple_length = _tuple_length; 443 *address = _address; 444 return 0; 445 } 446 447 /** 448 * dvb_ca_en50221_parse_attributes - Parse attribute memory of a CAM module, 449 * extracting Config register, and checking it is a DVB CAM module. 450 * 451 * @ca: CA instance. 452 * @slot: Slot id. 453 * 454 * return: 0 on success, <0 on failure. 455 */ dvb_ca_en50221_parse_attributes(struct dvb_ca_private * ca,int slot)456 static int dvb_ca_en50221_parse_attributes(struct dvb_ca_private *ca, int slot) 457 { 458 struct dvb_ca_slot *sl; 459 int address = 0; 460 int tuple_length; 461 int tuple_type; 462 u8 tuple[257]; 463 char *dvb_str; 464 int rasz; 465 int status; 466 int got_cftableentry = 0; 467 int end_chain = 0; 468 int i; 469 u16 manfid = 0; 470 u16 devid = 0; 471 472 /* CISTPL_DEVICE_0A */ 473 status = dvb_ca_en50221_read_tuple(ca, slot, &address, &tuple_type, 474 &tuple_length, tuple); 475 if (status < 0) 476 return status; 477 if (tuple_type != 0x1D) 478 return -EINVAL; 479 480 /* CISTPL_DEVICE_0C */ 481 status = dvb_ca_en50221_read_tuple(ca, slot, &address, &tuple_type, 482 &tuple_length, tuple); 483 if (status < 0) 484 return status; 485 if (tuple_type != 0x1C) 486 return -EINVAL; 487 488 /* CISTPL_VERS_1 */ 489 status = dvb_ca_en50221_read_tuple(ca, slot, &address, &tuple_type, 490 &tuple_length, tuple); 491 if (status < 0) 492 return status; 493 if (tuple_type != 0x15) 494 return -EINVAL; 495 496 /* CISTPL_MANFID */ 497 status = dvb_ca_en50221_read_tuple(ca, slot, &address, &tuple_type, 498 &tuple_length, tuple); 499 if (status < 0) 500 return status; 501 if (tuple_type != 0x20) 502 return -EINVAL; 503 if (tuple_length != 4) 504 return -EINVAL; 505 manfid = (tuple[1] << 8) | tuple[0]; 506 devid = (tuple[3] << 8) | tuple[2]; 507 508 /* CISTPL_CONFIG */ 509 status = dvb_ca_en50221_read_tuple(ca, slot, &address, &tuple_type, 510 &tuple_length, tuple); 511 if (status < 0) 512 return status; 513 if (tuple_type != 0x1A) 514 return -EINVAL; 515 if (tuple_length < 3) 516 return -EINVAL; 517 518 /* extract the configbase */ 519 rasz = tuple[0] & 3; 520 if (tuple_length < (3 + rasz + 14)) 521 return -EINVAL; 522 sl = &ca->slot_info[slot]; 523 sl->config_base = 0; 524 for (i = 0; i < rasz + 1; i++) 525 sl->config_base |= (tuple[2 + i] << (8 * i)); 526 527 /* check it contains the correct DVB string */ 528 dvb_str = findstr((char *)tuple, tuple_length, "DVB_CI_V", 8); 529 if (!dvb_str) 530 return -EINVAL; 531 if (tuple_length < ((dvb_str - (char *)tuple) + 12)) 532 return -EINVAL; 533 534 /* is it a version we support? */ 535 if (strncmp(dvb_str + 8, "1.00", 4)) { 536 pr_err("dvb_ca adapter %d: Unsupported DVB CAM module version %c%c%c%c\n", 537 ca->dvbdev->adapter->num, dvb_str[8], dvb_str[9], 538 dvb_str[10], dvb_str[11]); 539 return -EINVAL; 540 } 541 542 /* process the CFTABLE_ENTRY tuples, and any after those */ 543 while ((!end_chain) && (address < 0x1000)) { 544 status = dvb_ca_en50221_read_tuple(ca, slot, &address, 545 &tuple_type, &tuple_length, 546 tuple); 547 if (status < 0) 548 return status; 549 switch (tuple_type) { 550 case 0x1B: /* CISTPL_CFTABLE_ENTRY */ 551 if (tuple_length < (2 + 11 + 17)) 552 break; 553 554 /* if we've already parsed one, just use it */ 555 if (got_cftableentry) 556 break; 557 558 /* get the config option */ 559 sl->config_option = tuple[0] & 0x3f; 560 561 /* OK, check it contains the correct strings */ 562 if (!findstr((char *)tuple, tuple_length, 563 "DVB_HOST", 8) || 564 !findstr((char *)tuple, tuple_length, 565 "DVB_CI_MODULE", 13)) 566 break; 567 568 got_cftableentry = 1; 569 break; 570 571 case 0x14: /* CISTPL_NO_LINK */ 572 break; 573 574 case 0xFF: /* CISTPL_END */ 575 end_chain = 1; 576 break; 577 578 default: /* Unknown tuple type - just skip this tuple */ 579 dprintk("dvb_ca: Skipping unknown tuple type:0x%x length:0x%x\n", 580 tuple_type, tuple_length); 581 break; 582 } 583 } 584 585 if ((address > 0x1000) || (!got_cftableentry)) 586 return -EINVAL; 587 588 dprintk("Valid DVB CAM detected MANID:%x DEVID:%x CONFIGBASE:0x%x CONFIGOPTION:0x%x\n", 589 manfid, devid, sl->config_base, sl->config_option); 590 591 /* success! */ 592 return 0; 593 } 594 595 /** 596 * dvb_ca_en50221_set_configoption - Set CAM's configoption correctly. 597 * 598 * @ca: CA instance. 599 * @slot: Slot containing the CAM. 600 */ dvb_ca_en50221_set_configoption(struct dvb_ca_private * ca,int slot)601 static int dvb_ca_en50221_set_configoption(struct dvb_ca_private *ca, int slot) 602 { 603 struct dvb_ca_slot *sl = &ca->slot_info[slot]; 604 int configoption; 605 606 dprintk("%s\n", __func__); 607 608 /* set the config option */ 609 ca->pub->write_attribute_mem(ca->pub, slot, sl->config_base, 610 sl->config_option); 611 612 /* check it */ 613 configoption = ca->pub->read_attribute_mem(ca->pub, slot, 614 sl->config_base); 615 dprintk("Set configoption 0x%x, read configoption 0x%x\n", 616 sl->config_option, configoption & 0x3f); 617 618 /* fine! */ 619 return 0; 620 } 621 622 /** 623 * dvb_ca_en50221_read_data - This function talks to an EN50221 CAM control 624 * interface. It reads a buffer of data from the CAM. The data can either 625 * be stored in a supplied buffer, or automatically be added to the slot's 626 * rx_buffer. 627 * 628 * @ca: CA instance. 629 * @slot: Slot to read from. 630 * @ebuf: If non-NULL, the data will be written to this buffer. If NULL, 631 * the data will be added into the buffering system as a normal 632 * fragment. 633 * @ecount: Size of ebuf. Ignored if ebuf is NULL. 634 * 635 * return: Number of bytes read, or < 0 on error 636 */ dvb_ca_en50221_read_data(struct dvb_ca_private * ca,int slot,u8 * ebuf,int ecount)637 static int dvb_ca_en50221_read_data(struct dvb_ca_private *ca, int slot, 638 u8 *ebuf, int ecount) 639 { 640 struct dvb_ca_slot *sl = &ca->slot_info[slot]; 641 int bytes_read; 642 int status; 643 u8 buf[HOST_LINK_BUF_SIZE]; 644 int i; 645 646 dprintk("%s\n", __func__); 647 648 /* check if we have space for a link buf in the rx_buffer */ 649 if (!ebuf) { 650 int buf_free; 651 652 if (!sl->rx_buffer.data) { 653 status = -EIO; 654 goto exit; 655 } 656 buf_free = dvb_ringbuffer_free(&sl->rx_buffer); 657 658 if (buf_free < (sl->link_buf_size + 659 DVB_RINGBUFFER_PKTHDRSIZE)) { 660 status = -EAGAIN; 661 goto exit; 662 } 663 } 664 665 if (ca->pub->read_data && 666 (sl->slot_state != DVB_CA_SLOTSTATE_LINKINIT)) { 667 if (!ebuf) 668 status = ca->pub->read_data(ca->pub, slot, buf, 669 sizeof(buf)); 670 else 671 status = ca->pub->read_data(ca->pub, slot, buf, ecount); 672 if (status < 0) 673 return status; 674 bytes_read = status; 675 if (status == 0) 676 goto exit; 677 } else { 678 /* check if there is data available */ 679 status = ca->pub->read_cam_control(ca->pub, slot, 680 CTRLIF_STATUS); 681 if (status < 0) 682 goto exit; 683 if (!(status & STATUSREG_DA)) { 684 /* no data */ 685 status = 0; 686 goto exit; 687 } 688 689 /* read the amount of data */ 690 status = ca->pub->read_cam_control(ca->pub, slot, 691 CTRLIF_SIZE_HIGH); 692 if (status < 0) 693 goto exit; 694 bytes_read = status << 8; 695 status = ca->pub->read_cam_control(ca->pub, slot, 696 CTRLIF_SIZE_LOW); 697 if (status < 0) 698 goto exit; 699 bytes_read |= status; 700 701 /* check it will fit */ 702 if (!ebuf) { 703 if (bytes_read > sl->link_buf_size) { 704 pr_err("dvb_ca adapter %d: CAM tried to send a buffer larger than the link buffer size (%i > %i)!\n", 705 ca->dvbdev->adapter->num, bytes_read, 706 sl->link_buf_size); 707 sl->slot_state = DVB_CA_SLOTSTATE_LINKINIT; 708 status = -EIO; 709 goto exit; 710 } 711 if (bytes_read < 2) { 712 pr_err("dvb_ca adapter %d: CAM sent a buffer that was less than 2 bytes!\n", 713 ca->dvbdev->adapter->num); 714 sl->slot_state = DVB_CA_SLOTSTATE_LINKINIT; 715 status = -EIO; 716 goto exit; 717 } 718 } else { 719 if (bytes_read > ecount) { 720 pr_err("dvb_ca adapter %d: CAM tried to send a buffer larger than the ecount size!\n", 721 ca->dvbdev->adapter->num); 722 status = -EIO; 723 goto exit; 724 } 725 } 726 727 /* fill the buffer */ 728 for (i = 0; i < bytes_read; i++) { 729 /* read byte and check */ 730 status = ca->pub->read_cam_control(ca->pub, slot, 731 CTRLIF_DATA); 732 if (status < 0) 733 goto exit; 734 735 /* OK, store it in the buffer */ 736 buf[i] = status; 737 } 738 739 /* check for read error (RE should now be 0) */ 740 status = ca->pub->read_cam_control(ca->pub, slot, 741 CTRLIF_STATUS); 742 if (status < 0) 743 goto exit; 744 if (status & STATUSREG_RE) { 745 sl->slot_state = DVB_CA_SLOTSTATE_LINKINIT; 746 status = -EIO; 747 goto exit; 748 } 749 } 750 751 /* 752 * OK, add it to the receive buffer, or copy into external buffer if 753 * supplied 754 */ 755 if (!ebuf) { 756 if (!sl->rx_buffer.data) { 757 status = -EIO; 758 goto exit; 759 } 760 dvb_ringbuffer_pkt_write(&sl->rx_buffer, buf, bytes_read); 761 } else { 762 memcpy(ebuf, buf, bytes_read); 763 } 764 765 dprintk("Received CA packet for slot %i connection id 0x%x last_frag:%i size:0x%x\n", slot, 766 buf[0], (buf[1] & 0x80) == 0, bytes_read); 767 768 /* wake up readers when a last_fragment is received */ 769 if ((buf[1] & 0x80) == 0x00) 770 wake_up_interruptible(&ca->wait_queue); 771 772 status = bytes_read; 773 774 exit: 775 return status; 776 } 777 778 /** 779 * dvb_ca_en50221_write_data - This function talks to an EN50221 CAM control 780 * interface. It writes a buffer of data to a CAM. 781 * 782 * @ca: CA instance. 783 * @slot: Slot to write to. 784 * @buf: The data in this buffer is treated as a complete link-level packet to 785 * be written. 786 * @bytes_write: Size of ebuf. 787 * @size_write_flag: A flag on Command Register which says whether the link size 788 * information will be writen or not. 789 * 790 * return: Number of bytes written, or < 0 on error. 791 */ dvb_ca_en50221_write_data(struct dvb_ca_private * ca,int slot,u8 * buf,int bytes_write,int size_write_flag)792 static int dvb_ca_en50221_write_data(struct dvb_ca_private *ca, int slot, 793 u8 *buf, int bytes_write, int size_write_flag) 794 { 795 struct dvb_ca_slot *sl = &ca->slot_info[slot]; 796 int status; 797 int i; 798 799 dprintk("%s\n", __func__); 800 801 /* sanity check */ 802 if (bytes_write > sl->link_buf_size) 803 return -EINVAL; 804 805 if (ca->pub->write_data && 806 (sl->slot_state != DVB_CA_SLOTSTATE_LINKINIT)) 807 return ca->pub->write_data(ca->pub, slot, buf, bytes_write); 808 809 /* 810 * it is possible we are dealing with a single buffer implementation, 811 * thus if there is data available for read or if there is even a read 812 * already in progress, we do nothing but awake the kernel thread to 813 * process the data if necessary. 814 */ 815 status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS); 816 if (status < 0) 817 goto exitnowrite; 818 if (status & (STATUSREG_DA | STATUSREG_RE)) { 819 if (status & STATUSREG_DA) 820 dvb_ca_en50221_thread_wakeup(ca); 821 822 status = -EAGAIN; 823 goto exitnowrite; 824 } 825 826 /* OK, set HC bit */ 827 status = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, 828 IRQEN | CMDREG_HC | size_write_flag); 829 if (status) 830 goto exit; 831 832 /* check if interface is still free */ 833 status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS); 834 if (status < 0) 835 goto exit; 836 if (!(status & STATUSREG_FR)) { 837 /* it wasn't free => try again later */ 838 status = -EAGAIN; 839 goto exit; 840 } 841 842 /* 843 * It may need some time for the CAM to settle down, or there might 844 * be a race condition between the CAM, writing HC and our last 845 * check for DA. This happens, if the CAM asserts DA, just after 846 * checking DA before we are setting HC. In this case it might be 847 * a bug in the CAM to keep the FR bit, the lower layer/HW 848 * communication requires a longer timeout or the CAM needs more 849 * time internally. But this happens in reality! 850 * We need to read the status from the HW again and do the same 851 * we did for the previous check for DA 852 */ 853 status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS); 854 if (status < 0) 855 goto exit; 856 857 if (status & (STATUSREG_DA | STATUSREG_RE)) { 858 if (status & STATUSREG_DA) 859 dvb_ca_en50221_thread_wakeup(ca); 860 861 status = -EAGAIN; 862 goto exit; 863 } 864 865 /* send the amount of data */ 866 status = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_SIZE_HIGH, 867 bytes_write >> 8); 868 if (status) 869 goto exit; 870 status = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_SIZE_LOW, 871 bytes_write & 0xff); 872 if (status) 873 goto exit; 874 875 /* send the buffer */ 876 for (i = 0; i < bytes_write; i++) { 877 status = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_DATA, 878 buf[i]); 879 if (status) 880 goto exit; 881 } 882 883 /* check for write error (WE should now be 0) */ 884 status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS); 885 if (status < 0) 886 goto exit; 887 if (status & STATUSREG_WE) { 888 sl->slot_state = DVB_CA_SLOTSTATE_LINKINIT; 889 status = -EIO; 890 goto exit; 891 } 892 status = bytes_write; 893 894 dprintk("Wrote CA packet for slot %i, connection id 0x%x last_frag:%i size:0x%x\n", slot, 895 buf[0], (buf[1] & 0x80) == 0, bytes_write); 896 897 exit: 898 ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, IRQEN); 899 900 exitnowrite: 901 return status; 902 } 903 904 /* ************************************************************************** */ 905 /* EN50221 higher level functions */ 906 907 /** 908 * dvb_ca_en50221_slot_shutdown - A CAM has been removed => shut it down. 909 * 910 * @ca: CA instance. 911 * @slot: Slot to shut down. 912 */ dvb_ca_en50221_slot_shutdown(struct dvb_ca_private * ca,int slot)913 static int dvb_ca_en50221_slot_shutdown(struct dvb_ca_private *ca, int slot) 914 { 915 dprintk("%s\n", __func__); 916 917 ca->pub->slot_shutdown(ca->pub, slot); 918 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_NONE; 919 920 /* 921 * need to wake up all processes to check if they're now trying to 922 * write to a defunct CAM 923 */ 924 wake_up_interruptible(&ca->wait_queue); 925 926 dprintk("Slot %i shutdown\n", slot); 927 928 /* success */ 929 return 0; 930 } 931 932 /** 933 * dvb_ca_en50221_camchange_irq - A CAMCHANGE IRQ has occurred. 934 * 935 * @pubca: CA instance. 936 * @slot: Slot concerned. 937 * @change_type: One of the DVB_CA_CAMCHANGE_* values. 938 */ dvb_ca_en50221_camchange_irq(struct dvb_ca_en50221 * pubca,int slot,int change_type)939 void dvb_ca_en50221_camchange_irq(struct dvb_ca_en50221 *pubca, int slot, 940 int change_type) 941 { 942 struct dvb_ca_private *ca = pubca->private; 943 struct dvb_ca_slot *sl = &ca->slot_info[slot]; 944 945 dprintk("CAMCHANGE IRQ slot:%i change_type:%i\n", slot, change_type); 946 947 switch (change_type) { 948 case DVB_CA_EN50221_CAMCHANGE_REMOVED: 949 case DVB_CA_EN50221_CAMCHANGE_INSERTED: 950 break; 951 952 default: 953 return; 954 } 955 956 sl->camchange_type = change_type; 957 atomic_inc(&sl->camchange_count); 958 dvb_ca_en50221_thread_wakeup(ca); 959 } 960 EXPORT_SYMBOL(dvb_ca_en50221_camchange_irq); 961 962 /** 963 * dvb_ca_en50221_camready_irq - A CAMREADY IRQ has occurred. 964 * 965 * @pubca: CA instance. 966 * @slot: Slot concerned. 967 */ dvb_ca_en50221_camready_irq(struct dvb_ca_en50221 * pubca,int slot)968 void dvb_ca_en50221_camready_irq(struct dvb_ca_en50221 *pubca, int slot) 969 { 970 struct dvb_ca_private *ca = pubca->private; 971 struct dvb_ca_slot *sl = &ca->slot_info[slot]; 972 973 dprintk("CAMREADY IRQ slot:%i\n", slot); 974 975 if (sl->slot_state == DVB_CA_SLOTSTATE_WAITREADY) { 976 sl->slot_state = DVB_CA_SLOTSTATE_VALIDATE; 977 dvb_ca_en50221_thread_wakeup(ca); 978 } 979 } 980 EXPORT_SYMBOL(dvb_ca_en50221_camready_irq); 981 982 /** 983 * dvb_ca_en50221_frda_irq - An FR or DA IRQ has occurred. 984 * 985 * @pubca: CA instance. 986 * @slot: Slot concerned. 987 */ dvb_ca_en50221_frda_irq(struct dvb_ca_en50221 * pubca,int slot)988 void dvb_ca_en50221_frda_irq(struct dvb_ca_en50221 *pubca, int slot) 989 { 990 struct dvb_ca_private *ca = pubca->private; 991 struct dvb_ca_slot *sl = &ca->slot_info[slot]; 992 int flags; 993 994 dprintk("FR/DA IRQ slot:%i\n", slot); 995 996 switch (sl->slot_state) { 997 case DVB_CA_SLOTSTATE_LINKINIT: 998 flags = ca->pub->read_cam_control(pubca, slot, CTRLIF_STATUS); 999 if (flags & STATUSREG_DA) { 1000 dprintk("CAM supports DA IRQ\n"); 1001 sl->da_irq_supported = 1; 1002 } 1003 break; 1004 1005 case DVB_CA_SLOTSTATE_RUNNING: 1006 if (ca->open) 1007 dvb_ca_en50221_thread_wakeup(ca); 1008 break; 1009 } 1010 } 1011 EXPORT_SYMBOL(dvb_ca_en50221_frda_irq); 1012 1013 /* ************************************************************************** */ 1014 /* EN50221 thread functions */ 1015 1016 /** 1017 * dvb_ca_en50221_thread_wakeup - Wake up the DVB CA thread 1018 * 1019 * @ca: CA instance. 1020 */ dvb_ca_en50221_thread_wakeup(struct dvb_ca_private * ca)1021 static void dvb_ca_en50221_thread_wakeup(struct dvb_ca_private *ca) 1022 { 1023 dprintk("%s\n", __func__); 1024 1025 ca->wakeup = 1; 1026 mb(); 1027 wake_up_process(ca->thread); 1028 } 1029 1030 /** 1031 * dvb_ca_en50221_thread_update_delay - Update the delay used by the thread. 1032 * 1033 * @ca: CA instance. 1034 */ dvb_ca_en50221_thread_update_delay(struct dvb_ca_private * ca)1035 static void dvb_ca_en50221_thread_update_delay(struct dvb_ca_private *ca) 1036 { 1037 int delay; 1038 int curdelay = 100000000; 1039 int slot; 1040 1041 /* 1042 * Beware of too high polling frequency, because one polling 1043 * call might take several hundred milliseconds until timeout! 1044 */ 1045 for (slot = 0; slot < ca->slot_count; slot++) { 1046 struct dvb_ca_slot *sl = &ca->slot_info[slot]; 1047 1048 switch (sl->slot_state) { 1049 default: 1050 case DVB_CA_SLOTSTATE_NONE: 1051 delay = HZ * 60; /* 60s */ 1052 if (!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE)) 1053 delay = HZ * 5; /* 5s */ 1054 break; 1055 case DVB_CA_SLOTSTATE_INVALID: 1056 delay = HZ * 60; /* 60s */ 1057 if (!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE)) 1058 delay = HZ / 10; /* 100ms */ 1059 break; 1060 1061 case DVB_CA_SLOTSTATE_UNINITIALISED: 1062 case DVB_CA_SLOTSTATE_WAITREADY: 1063 case DVB_CA_SLOTSTATE_VALIDATE: 1064 case DVB_CA_SLOTSTATE_WAITFR: 1065 case DVB_CA_SLOTSTATE_LINKINIT: 1066 delay = HZ / 10; /* 100ms */ 1067 break; 1068 1069 case DVB_CA_SLOTSTATE_RUNNING: 1070 delay = HZ * 60; /* 60s */ 1071 if (!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE)) 1072 delay = HZ / 10; /* 100ms */ 1073 if (ca->open) { 1074 if ((!sl->da_irq_supported) || 1075 (!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_DA))) 1076 delay = HZ / 10; /* 100ms */ 1077 } 1078 break; 1079 } 1080 1081 if (delay < curdelay) 1082 curdelay = delay; 1083 } 1084 1085 ca->delay = curdelay; 1086 } 1087 1088 /** 1089 * dvb_ca_en50221_poll_cam_gone - Poll if the CAM is gone. 1090 * 1091 * @ca: CA instance. 1092 * @slot: Slot to process. 1093 * return:: 0 .. no change 1094 * 1 .. CAM state changed 1095 */ 1096 dvb_ca_en50221_poll_cam_gone(struct dvb_ca_private * ca,int slot)1097 static int dvb_ca_en50221_poll_cam_gone(struct dvb_ca_private *ca, int slot) 1098 { 1099 int changed = 0; 1100 int status; 1101 1102 /* 1103 * we need this extra check for annoying interfaces like the 1104 * budget-av 1105 */ 1106 if ((!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE)) && 1107 (ca->pub->poll_slot_status)) { 1108 status = ca->pub->poll_slot_status(ca->pub, slot, 0); 1109 if (!(status & 1110 DVB_CA_EN50221_POLL_CAM_PRESENT)) { 1111 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_NONE; 1112 dvb_ca_en50221_thread_update_delay(ca); 1113 changed = 1; 1114 } 1115 } 1116 return changed; 1117 } 1118 1119 /** 1120 * dvb_ca_en50221_thread_state_machine - Thread state machine for one CA slot 1121 * to perform the data transfer. 1122 * 1123 * @ca: CA instance. 1124 * @slot: Slot to process. 1125 */ dvb_ca_en50221_thread_state_machine(struct dvb_ca_private * ca,int slot)1126 static void dvb_ca_en50221_thread_state_machine(struct dvb_ca_private *ca, 1127 int slot) 1128 { 1129 struct dvb_ca_slot *sl = &ca->slot_info[slot]; 1130 int flags; 1131 int pktcount; 1132 void *rxbuf; 1133 1134 mutex_lock(&sl->slot_lock); 1135 1136 /* check the cam status + deal with CAMCHANGEs */ 1137 while (dvb_ca_en50221_check_camstatus(ca, slot)) { 1138 /* clear down an old CI slot if necessary */ 1139 if (sl->slot_state != DVB_CA_SLOTSTATE_NONE) 1140 dvb_ca_en50221_slot_shutdown(ca, slot); 1141 1142 /* if a CAM is NOW present, initialise it */ 1143 if (sl->camchange_type == DVB_CA_EN50221_CAMCHANGE_INSERTED) 1144 sl->slot_state = DVB_CA_SLOTSTATE_UNINITIALISED; 1145 1146 /* we've handled one CAMCHANGE */ 1147 dvb_ca_en50221_thread_update_delay(ca); 1148 atomic_dec(&sl->camchange_count); 1149 } 1150 1151 /* CAM state machine */ 1152 switch (sl->slot_state) { 1153 case DVB_CA_SLOTSTATE_NONE: 1154 case DVB_CA_SLOTSTATE_INVALID: 1155 /* no action needed */ 1156 break; 1157 1158 case DVB_CA_SLOTSTATE_UNINITIALISED: 1159 sl->slot_state = DVB_CA_SLOTSTATE_WAITREADY; 1160 ca->pub->slot_reset(ca->pub, slot); 1161 sl->timeout = jiffies + (INIT_TIMEOUT_SECS * HZ); 1162 break; 1163 1164 case DVB_CA_SLOTSTATE_WAITREADY: 1165 if (time_after(jiffies, sl->timeout)) { 1166 pr_err("dvb_ca adaptor %d: PC card did not respond :(\n", 1167 ca->dvbdev->adapter->num); 1168 sl->slot_state = DVB_CA_SLOTSTATE_INVALID; 1169 dvb_ca_en50221_thread_update_delay(ca); 1170 break; 1171 } 1172 /* 1173 * no other action needed; will automatically change state when 1174 * ready 1175 */ 1176 break; 1177 1178 case DVB_CA_SLOTSTATE_VALIDATE: 1179 if (dvb_ca_en50221_parse_attributes(ca, slot) != 0) { 1180 if (dvb_ca_en50221_poll_cam_gone(ca, slot)) 1181 break; 1182 1183 pr_err("dvb_ca adapter %d: Invalid PC card inserted :(\n", 1184 ca->dvbdev->adapter->num); 1185 sl->slot_state = DVB_CA_SLOTSTATE_INVALID; 1186 dvb_ca_en50221_thread_update_delay(ca); 1187 break; 1188 } 1189 if (dvb_ca_en50221_set_configoption(ca, slot) != 0) { 1190 pr_err("dvb_ca adapter %d: Unable to initialise CAM :(\n", 1191 ca->dvbdev->adapter->num); 1192 sl->slot_state = DVB_CA_SLOTSTATE_INVALID; 1193 dvb_ca_en50221_thread_update_delay(ca); 1194 break; 1195 } 1196 if (ca->pub->write_cam_control(ca->pub, slot, 1197 CTRLIF_COMMAND, 1198 CMDREG_RS) != 0) { 1199 pr_err("dvb_ca adapter %d: Unable to reset CAM IF\n", 1200 ca->dvbdev->adapter->num); 1201 sl->slot_state = DVB_CA_SLOTSTATE_INVALID; 1202 dvb_ca_en50221_thread_update_delay(ca); 1203 break; 1204 } 1205 dprintk("DVB CAM validated successfully\n"); 1206 1207 sl->timeout = jiffies + (INIT_TIMEOUT_SECS * HZ); 1208 sl->slot_state = DVB_CA_SLOTSTATE_WAITFR; 1209 ca->wakeup = 1; 1210 break; 1211 1212 case DVB_CA_SLOTSTATE_WAITFR: 1213 if (time_after(jiffies, sl->timeout)) { 1214 pr_err("dvb_ca adapter %d: DVB CAM did not respond :(\n", 1215 ca->dvbdev->adapter->num); 1216 sl->slot_state = DVB_CA_SLOTSTATE_INVALID; 1217 dvb_ca_en50221_thread_update_delay(ca); 1218 break; 1219 } 1220 1221 flags = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS); 1222 if (flags & STATUSREG_FR) { 1223 sl->slot_state = DVB_CA_SLOTSTATE_LINKINIT; 1224 ca->wakeup = 1; 1225 } 1226 break; 1227 1228 case DVB_CA_SLOTSTATE_LINKINIT: 1229 if (dvb_ca_en50221_link_init(ca, slot) != 0) { 1230 if (dvb_ca_en50221_poll_cam_gone(ca, slot)) 1231 break; 1232 1233 pr_err("dvb_ca adapter %d: DVB CAM link initialisation failed :(\n", 1234 ca->dvbdev->adapter->num); 1235 sl->slot_state = DVB_CA_SLOTSTATE_UNINITIALISED; 1236 dvb_ca_en50221_thread_update_delay(ca); 1237 break; 1238 } 1239 1240 if (!sl->rx_buffer.data) { 1241 rxbuf = vmalloc(RX_BUFFER_SIZE); 1242 if (!rxbuf) { 1243 pr_err("dvb_ca adapter %d: Unable to allocate CAM rx buffer :(\n", 1244 ca->dvbdev->adapter->num); 1245 sl->slot_state = DVB_CA_SLOTSTATE_INVALID; 1246 dvb_ca_en50221_thread_update_delay(ca); 1247 break; 1248 } 1249 dvb_ringbuffer_init(&sl->rx_buffer, rxbuf, 1250 RX_BUFFER_SIZE); 1251 } 1252 1253 ca->pub->slot_ts_enable(ca->pub, slot); 1254 sl->slot_state = DVB_CA_SLOTSTATE_RUNNING; 1255 dvb_ca_en50221_thread_update_delay(ca); 1256 pr_info("dvb_ca adapter %d: DVB CAM detected and initialised successfully\n", 1257 ca->dvbdev->adapter->num); 1258 break; 1259 1260 case DVB_CA_SLOTSTATE_RUNNING: 1261 if (!ca->open) 1262 break; 1263 1264 /* poll slots for data */ 1265 pktcount = 0; 1266 while (dvb_ca_en50221_read_data(ca, slot, NULL, 0) > 0) { 1267 if (!ca->open) 1268 break; 1269 1270 /* 1271 * if a CAMCHANGE occurred at some point, do not do any 1272 * more processing of this slot 1273 */ 1274 if (dvb_ca_en50221_check_camstatus(ca, slot)) { 1275 /* 1276 * we don't want to sleep on the next iteration 1277 * so we can handle the cam change 1278 */ 1279 ca->wakeup = 1; 1280 break; 1281 } 1282 1283 /* check if we've hit our limit this time */ 1284 if (++pktcount >= MAX_RX_PACKETS_PER_ITERATION) { 1285 /* 1286 * don't sleep; there is likely to be more data 1287 * to read 1288 */ 1289 ca->wakeup = 1; 1290 break; 1291 } 1292 } 1293 break; 1294 } 1295 1296 mutex_unlock(&sl->slot_lock); 1297 } 1298 1299 /* 1300 * Kernel thread which monitors CA slots for CAM changes, and performs data 1301 * transfers. 1302 */ dvb_ca_en50221_thread(void * data)1303 static int dvb_ca_en50221_thread(void *data) 1304 { 1305 struct dvb_ca_private *ca = data; 1306 int slot; 1307 1308 dprintk("%s\n", __func__); 1309 1310 /* choose the correct initial delay */ 1311 dvb_ca_en50221_thread_update_delay(ca); 1312 1313 /* main loop */ 1314 while (!kthread_should_stop()) { 1315 /* sleep for a bit */ 1316 if (!ca->wakeup) { 1317 set_current_state(TASK_INTERRUPTIBLE); 1318 schedule_timeout(ca->delay); 1319 if (kthread_should_stop()) 1320 return 0; 1321 } 1322 ca->wakeup = 0; 1323 1324 /* go through all the slots processing them */ 1325 for (slot = 0; slot < ca->slot_count; slot++) 1326 dvb_ca_en50221_thread_state_machine(ca, slot); 1327 } 1328 1329 return 0; 1330 } 1331 1332 /* ************************************************************************** */ 1333 /* EN50221 IO interface functions */ 1334 1335 /** 1336 * dvb_ca_en50221_io_do_ioctl - Real ioctl implementation. 1337 * 1338 * @file: File concerned. 1339 * @cmd: IOCTL command. 1340 * @parg: Associated argument. 1341 * 1342 * NOTE: CA_SEND_MSG/CA_GET_MSG ioctls have userspace buffers passed to them. 1343 * 1344 * return: 0 on success, <0 on error. 1345 */ dvb_ca_en50221_io_do_ioctl(struct file * file,unsigned int cmd,void * parg)1346 static int dvb_ca_en50221_io_do_ioctl(struct file *file, 1347 unsigned int cmd, void *parg) 1348 { 1349 struct dvb_device *dvbdev = file->private_data; 1350 struct dvb_ca_private *ca = dvbdev->priv; 1351 int err = 0; 1352 int slot; 1353 1354 dprintk("%s\n", __func__); 1355 1356 if (mutex_lock_interruptible(&ca->ioctl_mutex)) 1357 return -ERESTARTSYS; 1358 1359 switch (cmd) { 1360 case CA_RESET: 1361 for (slot = 0; slot < ca->slot_count; slot++) { 1362 struct dvb_ca_slot *sl = &ca->slot_info[slot]; 1363 1364 mutex_lock(&sl->slot_lock); 1365 if (sl->slot_state != DVB_CA_SLOTSTATE_NONE) { 1366 dvb_ca_en50221_slot_shutdown(ca, slot); 1367 if (ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE) 1368 dvb_ca_en50221_camchange_irq(ca->pub, 1369 slot, 1370 DVB_CA_EN50221_CAMCHANGE_INSERTED); 1371 } 1372 mutex_unlock(&sl->slot_lock); 1373 } 1374 ca->next_read_slot = 0; 1375 dvb_ca_en50221_thread_wakeup(ca); 1376 break; 1377 1378 case CA_GET_CAP: { 1379 struct ca_caps *caps = parg; 1380 1381 caps->slot_num = ca->slot_count; 1382 caps->slot_type = CA_CI_LINK; 1383 caps->descr_num = 0; 1384 caps->descr_type = 0; 1385 break; 1386 } 1387 1388 case CA_GET_SLOT_INFO: { 1389 struct ca_slot_info *info = parg; 1390 struct dvb_ca_slot *sl; 1391 1392 slot = info->num; 1393 if ((slot >= ca->slot_count) || (slot < 0)) { 1394 err = -EINVAL; 1395 goto out_unlock; 1396 } 1397 slot = array_index_nospec(slot, ca->slot_count); 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 * dvb_ca_en50221_io_ioctl - 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 */ dvb_ca_en50221_io_ioctl(struct file * file,unsigned int cmd,unsigned long arg)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 * dvb_ca_en50221_io_write - 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 */ dvb_ca_en50221_io_write(struct file * file,const char __user * buf,size_t count,loff_t * ppos)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, 0); 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 */ dvb_ca_en50221_io_read_condition(struct dvb_ca_private * ca,int * result,int * _slot)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 * dvb_ca_en50221_io_read - 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 */ dvb_ca_en50221_io_read(struct file * file,char __user * buf,size_t count,loff_t * ppos)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 * dvb_ca_en50221_io_open - Implementation of file open syscall. 1705 * 1706 * @inode: Inode concerned. 1707 * @file: File concerned. 1708 * 1709 * return: 0 on success, <0 on failure. 1710 */ dvb_ca_en50221_io_open(struct inode * inode,struct file * file)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 mutex_lock(&ca->remove_mutex); 1721 1722 if (ca->exit) { 1723 mutex_unlock(&ca->remove_mutex); 1724 return -ENODEV; 1725 } 1726 1727 if (!try_module_get(ca->pub->owner)) { 1728 mutex_unlock(&ca->remove_mutex); 1729 return -EIO; 1730 } 1731 1732 err = dvb_generic_open(inode, file); 1733 if (err < 0) { 1734 module_put(ca->pub->owner); 1735 mutex_unlock(&ca->remove_mutex); 1736 return err; 1737 } 1738 1739 for (i = 0; i < ca->slot_count; i++) { 1740 struct dvb_ca_slot *sl = &ca->slot_info[i]; 1741 1742 if (sl->slot_state == DVB_CA_SLOTSTATE_RUNNING) { 1743 if (!sl->rx_buffer.data) { 1744 /* 1745 * it is safe to call this here without locks 1746 * because ca->open == 0. Data is not read in 1747 * this case 1748 */ 1749 dvb_ringbuffer_flush(&sl->rx_buffer); 1750 } 1751 } 1752 } 1753 1754 ca->open = 1; 1755 dvb_ca_en50221_thread_update_delay(ca); 1756 dvb_ca_en50221_thread_wakeup(ca); 1757 1758 dvb_ca_private_get(ca); 1759 1760 mutex_unlock(&ca->remove_mutex); 1761 return 0; 1762 } 1763 1764 /** 1765 * dvb_ca_en50221_io_release - Implementation of file close syscall. 1766 * 1767 * @inode: Inode concerned. 1768 * @file: File concerned. 1769 * 1770 * return: 0 on success, <0 on failure. 1771 */ dvb_ca_en50221_io_release(struct inode * inode,struct file * file)1772 static int dvb_ca_en50221_io_release(struct inode *inode, struct file *file) 1773 { 1774 struct dvb_device *dvbdev = file->private_data; 1775 struct dvb_ca_private *ca = dvbdev->priv; 1776 int err; 1777 1778 dprintk("%s\n", __func__); 1779 1780 mutex_lock(&ca->remove_mutex); 1781 1782 /* mark the CA device as closed */ 1783 ca->open = 0; 1784 dvb_ca_en50221_thread_update_delay(ca); 1785 1786 err = dvb_generic_release(inode, file); 1787 1788 module_put(ca->pub->owner); 1789 1790 dvb_ca_private_put(ca); 1791 1792 if (dvbdev->users == 1 && ca->exit == 1) { 1793 mutex_unlock(&ca->remove_mutex); 1794 wake_up(&dvbdev->wait_queue); 1795 } else { 1796 mutex_unlock(&ca->remove_mutex); 1797 } 1798 1799 return err; 1800 } 1801 1802 /** 1803 * dvb_ca_en50221_io_poll - Implementation of poll() syscall. 1804 * 1805 * @file: File concerned. 1806 * @wait: poll wait table. 1807 * 1808 * return: Standard poll mask. 1809 */ dvb_ca_en50221_io_poll(struct file * file,poll_table * wait)1810 static __poll_t dvb_ca_en50221_io_poll(struct file *file, poll_table *wait) 1811 { 1812 struct dvb_device *dvbdev = file->private_data; 1813 struct dvb_ca_private *ca = dvbdev->priv; 1814 __poll_t mask = 0; 1815 int slot; 1816 int result = 0; 1817 1818 dprintk("%s\n", __func__); 1819 1820 poll_wait(file, &ca->wait_queue, wait); 1821 1822 if (dvb_ca_en50221_io_read_condition(ca, &result, &slot) == 1) 1823 mask |= EPOLLIN; 1824 1825 /* if there is something, return now */ 1826 if (mask) 1827 return mask; 1828 1829 if (dvb_ca_en50221_io_read_condition(ca, &result, &slot) == 1) 1830 mask |= EPOLLIN; 1831 1832 return mask; 1833 } 1834 1835 static const struct file_operations dvb_ca_fops = { 1836 .owner = THIS_MODULE, 1837 .read = dvb_ca_en50221_io_read, 1838 .write = dvb_ca_en50221_io_write, 1839 .unlocked_ioctl = dvb_ca_en50221_io_ioctl, 1840 .open = dvb_ca_en50221_io_open, 1841 .release = dvb_ca_en50221_io_release, 1842 .poll = dvb_ca_en50221_io_poll, 1843 .llseek = noop_llseek, 1844 }; 1845 1846 static const struct dvb_device dvbdev_ca = { 1847 .priv = NULL, 1848 .users = 1, 1849 .readers = 1, 1850 .writers = 1, 1851 #if defined(CONFIG_MEDIA_CONTROLLER_DVB) 1852 .name = "dvb-ca-en50221", 1853 #endif 1854 .fops = &dvb_ca_fops, 1855 }; 1856 1857 /* ************************************************************************** */ 1858 /* Initialisation/shutdown functions */ 1859 1860 /** 1861 * dvb_ca_en50221_init - Initialise a new DVB CA EN50221 interface device. 1862 * 1863 * @dvb_adapter: DVB adapter to attach the new CA device to. 1864 * @pubca: The dvb_ca instance. 1865 * @flags: Flags describing the CA device (DVB_CA_FLAG_*). 1866 * @slot_count: Number of slots supported. 1867 * 1868 * return: 0 on success, nonzero on failure 1869 */ dvb_ca_en50221_init(struct dvb_adapter * dvb_adapter,struct dvb_ca_en50221 * pubca,int flags,int slot_count)1870 int dvb_ca_en50221_init(struct dvb_adapter *dvb_adapter, 1871 struct dvb_ca_en50221 *pubca, int flags, int slot_count) 1872 { 1873 int ret; 1874 struct dvb_ca_private *ca = NULL; 1875 int i; 1876 1877 dprintk("%s\n", __func__); 1878 1879 if (slot_count < 1) 1880 return -EINVAL; 1881 1882 /* initialise the system data */ 1883 ca = kzalloc(sizeof(*ca), GFP_KERNEL); 1884 if (!ca) { 1885 ret = -ENOMEM; 1886 goto exit; 1887 } 1888 kref_init(&ca->refcount); 1889 ca->pub = pubca; 1890 ca->flags = flags; 1891 ca->slot_count = slot_count; 1892 ca->slot_info = kcalloc(slot_count, sizeof(struct dvb_ca_slot), 1893 GFP_KERNEL); 1894 if (!ca->slot_info) { 1895 ret = -ENOMEM; 1896 goto free_ca; 1897 } 1898 init_waitqueue_head(&ca->wait_queue); 1899 ca->open = 0; 1900 ca->wakeup = 0; 1901 ca->next_read_slot = 0; 1902 pubca->private = ca; 1903 1904 /* register the DVB device */ 1905 ret = dvb_register_device(dvb_adapter, &ca->dvbdev, &dvbdev_ca, ca, 1906 DVB_DEVICE_CA, 0); 1907 if (ret) 1908 goto free_slot_info; 1909 1910 /* now initialise each slot */ 1911 for (i = 0; i < slot_count; i++) { 1912 struct dvb_ca_slot *sl = &ca->slot_info[i]; 1913 1914 memset(sl, 0, sizeof(struct dvb_ca_slot)); 1915 sl->slot_state = DVB_CA_SLOTSTATE_NONE; 1916 atomic_set(&sl->camchange_count, 0); 1917 sl->camchange_type = DVB_CA_EN50221_CAMCHANGE_REMOVED; 1918 mutex_init(&sl->slot_lock); 1919 } 1920 1921 mutex_init(&ca->ioctl_mutex); 1922 mutex_init(&ca->remove_mutex); 1923 1924 if (signal_pending(current)) { 1925 ret = -EINTR; 1926 goto unregister_device; 1927 } 1928 mb(); 1929 1930 /* create a kthread for monitoring this CA device */ 1931 ca->thread = kthread_run(dvb_ca_en50221_thread, ca, "kdvb-ca-%i:%i", 1932 ca->dvbdev->adapter->num, ca->dvbdev->id); 1933 if (IS_ERR(ca->thread)) { 1934 ret = PTR_ERR(ca->thread); 1935 pr_err("dvb_ca_init: failed to start kernel_thread (%d)\n", 1936 ret); 1937 goto unregister_device; 1938 } 1939 return 0; 1940 1941 unregister_device: 1942 dvb_unregister_device(ca->dvbdev); 1943 free_slot_info: 1944 kfree(ca->slot_info); 1945 free_ca: 1946 kfree(ca); 1947 exit: 1948 pubca->private = NULL; 1949 return ret; 1950 } 1951 EXPORT_SYMBOL(dvb_ca_en50221_init); 1952 1953 /** 1954 * dvb_ca_en50221_release - Release a DVB CA EN50221 interface device. 1955 * 1956 * @pubca: The associated dvb_ca instance. 1957 */ dvb_ca_en50221_release(struct dvb_ca_en50221 * pubca)1958 void dvb_ca_en50221_release(struct dvb_ca_en50221 *pubca) 1959 { 1960 struct dvb_ca_private *ca = pubca->private; 1961 int i; 1962 1963 dprintk("%s\n", __func__); 1964 1965 mutex_lock(&ca->remove_mutex); 1966 ca->exit = 1; 1967 mutex_unlock(&ca->remove_mutex); 1968 1969 if (ca->dvbdev->users < 1) 1970 wait_event(ca->dvbdev->wait_queue, 1971 ca->dvbdev->users == 1); 1972 1973 /* shutdown the thread if there was one */ 1974 kthread_stop(ca->thread); 1975 1976 for (i = 0; i < ca->slot_count; i++) 1977 dvb_ca_en50221_slot_shutdown(ca, i); 1978 1979 dvb_remove_device(ca->dvbdev); 1980 dvb_ca_private_put(ca); 1981 pubca->private = NULL; 1982 } 1983 EXPORT_SYMBOL(dvb_ca_en50221_release); 1984