1 /* 2 * dvb_ca.c: generic DVB functions for EN50221 CAM interfaces 3 * 4 * Copyright (C) 2004 Andrew de Quincey 5 * 6 * Parts of this file were based on sources as follows: 7 * 8 * Copyright (C) 2003 Ralph Metzler <rjkm@metzlerbros.de> 9 * 10 * based on code: 11 * 12 * Copyright (C) 1999-2002 Ralph Metzler 13 * & Marcus Metzler for convergence integrated media GmbH 14 * 15 * This program is free software; you can redistribute it and/or 16 * modify it under the terms of the GNU General Public License 17 * as published by the Free Software Foundation; either version 2 18 * of the License, or (at your option) any later version. 19 * 20 * This program is distributed in the hope that it will be useful, 21 * but WITHOUT ANY WARRANTY; without even the implied warranty of 22 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 23 * GNU General Public License for more details. 24 * 25 * You should have received a copy of the GNU General Public License 26 * along with this program; if not, write to the Free Software 27 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 28 * Or, point your browser to http://www.gnu.org/copyleft/gpl.html 29 */ 30 31 #define pr_fmt(fmt) "dvb_ca_en50221: " fmt 32 33 #include <linux/errno.h> 34 #include <linux/slab.h> 35 #include <linux/list.h> 36 #include <linux/module.h> 37 #include <linux/vmalloc.h> 38 #include <linux/delay.h> 39 #include <linux/spinlock.h> 40 #include <linux/sched.h> 41 #include <linux/kthread.h> 42 43 #include "dvb_ca_en50221.h" 44 #include "dvb_ringbuffer.h" 45 46 static int dvb_ca_en50221_debug; 47 48 module_param_named(cam_debug, dvb_ca_en50221_debug, int, 0644); 49 MODULE_PARM_DESC(cam_debug, "enable verbose debug messages"); 50 51 #define dprintk(fmt, arg...) do { \ 52 if (dvb_ca_en50221_debug) \ 53 printk(KERN_DEBUG pr_fmt("%s: " fmt), __func__, ##arg);\ 54 } while (0) 55 56 #define INIT_TIMEOUT_SECS 10 57 58 #define HOST_LINK_BUF_SIZE 0x200 59 60 #define RX_BUFFER_SIZE 65535 61 62 #define MAX_RX_PACKETS_PER_ITERATION 10 63 64 #define CTRLIF_DATA 0 65 #define CTRLIF_COMMAND 1 66 #define CTRLIF_STATUS 1 67 #define CTRLIF_SIZE_LOW 2 68 #define CTRLIF_SIZE_HIGH 3 69 70 #define CMDREG_HC 1 /* Host control */ 71 #define CMDREG_SW 2 /* Size write */ 72 #define CMDREG_SR 4 /* Size read */ 73 #define CMDREG_RS 8 /* Reset interface */ 74 #define CMDREG_FRIE 0x40 /* Enable FR interrupt */ 75 #define CMDREG_DAIE 0x80 /* Enable DA interrupt */ 76 #define IRQEN (CMDREG_DAIE) 77 78 #define STATUSREG_RE 1 /* read error */ 79 #define STATUSREG_WE 2 /* write error */ 80 #define STATUSREG_FR 0x40 /* module free */ 81 #define STATUSREG_DA 0x80 /* data available */ 82 #define STATUSREG_TXERR (STATUSREG_RE|STATUSREG_WE) /* general transfer error */ 83 84 85 #define DVB_CA_SLOTSTATE_NONE 0 86 #define DVB_CA_SLOTSTATE_UNINITIALISED 1 87 #define DVB_CA_SLOTSTATE_RUNNING 2 88 #define DVB_CA_SLOTSTATE_INVALID 3 89 #define DVB_CA_SLOTSTATE_WAITREADY 4 90 #define DVB_CA_SLOTSTATE_VALIDATE 5 91 #define DVB_CA_SLOTSTATE_WAITFR 6 92 #define DVB_CA_SLOTSTATE_LINKINIT 7 93 94 95 /* Information on a CA slot */ 96 struct dvb_ca_slot { 97 98 /* current state of the CAM */ 99 int slot_state; 100 101 /* mutex used for serializing access to one CI slot */ 102 struct mutex slot_lock; 103 104 /* Number of CAMCHANGES that have occurred since last processing */ 105 atomic_t camchange_count; 106 107 /* Type of last CAMCHANGE */ 108 int camchange_type; 109 110 /* base address of CAM config */ 111 u32 config_base; 112 113 /* value to write into Config Control register */ 114 u8 config_option; 115 116 /* if 1, the CAM supports DA IRQs */ 117 u8 da_irq_supported:1; 118 119 /* size of the buffer to use when talking to the CAM */ 120 int link_buf_size; 121 122 /* buffer for incoming packets */ 123 struct dvb_ringbuffer rx_buffer; 124 125 /* timer used during various states of the slot */ 126 unsigned long timeout; 127 }; 128 129 /* Private CA-interface information */ 130 struct dvb_ca_private { 131 struct kref refcount; 132 133 /* pointer back to the public data structure */ 134 struct dvb_ca_en50221 *pub; 135 136 /* the DVB device */ 137 struct dvb_device *dvbdev; 138 139 /* Flags describing the interface (DVB_CA_FLAG_*) */ 140 u32 flags; 141 142 /* number of slots supported by this CA interface */ 143 unsigned int slot_count; 144 145 /* information on each slot */ 146 struct dvb_ca_slot *slot_info; 147 148 /* wait queues for read() and write() operations */ 149 wait_queue_head_t wait_queue; 150 151 /* PID of the monitoring thread */ 152 struct task_struct *thread; 153 154 /* Flag indicating if the CA device is open */ 155 unsigned int open:1; 156 157 /* Flag indicating the thread should wake up now */ 158 unsigned int wakeup:1; 159 160 /* Delay the main thread should use */ 161 unsigned long delay; 162 163 /* Slot to start looking for data to read from in the next user-space read operation */ 164 int next_read_slot; 165 166 /* mutex serializing ioctls */ 167 struct mutex ioctl_mutex; 168 }; 169 170 static void dvb_ca_private_free(struct dvb_ca_private *ca) 171 { 172 unsigned int i; 173 174 dvb_free_device(ca->dvbdev); 175 for (i = 0; i < ca->slot_count; i++) 176 vfree(ca->slot_info[i].rx_buffer.data); 177 178 kfree(ca->slot_info); 179 kfree(ca); 180 } 181 182 static void dvb_ca_private_release(struct kref *ref) 183 { 184 struct dvb_ca_private *ca = container_of(ref, struct dvb_ca_private, refcount); 185 dvb_ca_private_free(ca); 186 } 187 188 static void dvb_ca_private_get(struct dvb_ca_private *ca) 189 { 190 kref_get(&ca->refcount); 191 } 192 193 static void dvb_ca_private_put(struct dvb_ca_private *ca) 194 { 195 kref_put(&ca->refcount, dvb_ca_private_release); 196 } 197 198 static void dvb_ca_en50221_thread_wakeup(struct dvb_ca_private *ca); 199 static int dvb_ca_en50221_read_data(struct dvb_ca_private *ca, int slot, u8 * ebuf, int ecount); 200 static int dvb_ca_en50221_write_data(struct dvb_ca_private *ca, int slot, u8 * ebuf, int ecount); 201 202 203 /** 204 * Safely find needle in haystack. 205 * 206 * @haystack: Buffer to look in. 207 * @hlen: Number of bytes in haystack. 208 * @needle: Buffer to find. 209 * @nlen: Number of bytes in needle. 210 * @return Pointer into haystack needle was found at, or NULL if not found. 211 */ 212 static char *findstr(char * haystack, int hlen, char * needle, int nlen) 213 { 214 int i; 215 216 if (hlen < nlen) 217 return NULL; 218 219 for (i = 0; i <= hlen - nlen; i++) { 220 if (!strncmp(haystack + i, needle, nlen)) 221 return haystack + i; 222 } 223 224 return NULL; 225 } 226 227 228 229 /* ******************************************************************************** */ 230 /* EN50221 physical interface functions */ 231 232 233 /** 234 * dvb_ca_en50221_check_camstatus - Check CAM status. 235 */ 236 static int dvb_ca_en50221_check_camstatus(struct dvb_ca_private *ca, int slot) 237 { 238 int slot_status; 239 int cam_present_now; 240 int cam_changed; 241 242 /* IRQ mode */ 243 if (ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE) { 244 return (atomic_read(&ca->slot_info[slot].camchange_count) != 0); 245 } 246 247 /* poll mode */ 248 slot_status = ca->pub->poll_slot_status(ca->pub, slot, ca->open); 249 250 cam_present_now = (slot_status & DVB_CA_EN50221_POLL_CAM_PRESENT) ? 1 : 0; 251 cam_changed = (slot_status & DVB_CA_EN50221_POLL_CAM_CHANGED) ? 1 : 0; 252 if (!cam_changed) { 253 int cam_present_old = (ca->slot_info[slot].slot_state != DVB_CA_SLOTSTATE_NONE); 254 cam_changed = (cam_present_now != cam_present_old); 255 } 256 257 if (cam_changed) { 258 if (!cam_present_now) { 259 ca->slot_info[slot].camchange_type = DVB_CA_EN50221_CAMCHANGE_REMOVED; 260 } else { 261 ca->slot_info[slot].camchange_type = DVB_CA_EN50221_CAMCHANGE_INSERTED; 262 } 263 atomic_set(&ca->slot_info[slot].camchange_count, 1); 264 } else { 265 if ((ca->slot_info[slot].slot_state == DVB_CA_SLOTSTATE_WAITREADY) && 266 (slot_status & DVB_CA_EN50221_POLL_CAM_READY)) { 267 // move to validate state if reset is completed 268 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_VALIDATE; 269 } 270 } 271 272 return cam_changed; 273 } 274 275 276 /** 277 * dvb_ca_en50221_wait_if_status - Wait for flags to become set on the STATUS 278 * register on a CAM interface, checking for errors and timeout. 279 * 280 * @ca: CA instance. 281 * @slot: Slot on interface. 282 * @waitfor: Flags to wait for. 283 * @timeout_ms: Timeout in milliseconds. 284 * 285 * @return 0 on success, nonzero on error. 286 */ 287 static int dvb_ca_en50221_wait_if_status(struct dvb_ca_private *ca, int slot, 288 u8 waitfor, int timeout_hz) 289 { 290 unsigned long timeout; 291 unsigned long start; 292 293 dprintk("%s\n", __func__); 294 295 /* loop until timeout elapsed */ 296 start = jiffies; 297 timeout = jiffies + timeout_hz; 298 while (1) { 299 /* read the status and check for error */ 300 int res = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS); 301 if (res < 0) 302 return -EIO; 303 304 /* if we got the flags, it was successful! */ 305 if (res & waitfor) { 306 dprintk("%s succeeded timeout:%lu\n", 307 __func__, jiffies - start); 308 return 0; 309 } 310 311 /* check for timeout */ 312 if (time_after(jiffies, timeout)) { 313 break; 314 } 315 316 /* wait for a bit */ 317 msleep(1); 318 } 319 320 dprintk("%s failed timeout:%lu\n", __func__, jiffies - start); 321 322 /* if we get here, we've timed out */ 323 return -ETIMEDOUT; 324 } 325 326 327 /** 328 * dvb_ca_en50221_link_init - Initialise the link layer connection to a CAM. 329 * 330 * @ca: CA instance. 331 * @slot: Slot id. 332 * 333 * @return 0 on success, nonzero on failure. 334 */ 335 static int dvb_ca_en50221_link_init(struct dvb_ca_private *ca, int slot) 336 { 337 int ret; 338 int buf_size; 339 u8 buf[2]; 340 341 dprintk("%s\n", __func__); 342 343 /* we'll be determining these during this function */ 344 ca->slot_info[slot].da_irq_supported = 0; 345 346 /* set the host link buffer size temporarily. it will be overwritten with the 347 * real negotiated size later. */ 348 ca->slot_info[slot].link_buf_size = 2; 349 350 /* read the buffer size from the CAM */ 351 if ((ret = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, IRQEN | CMDREG_SR)) != 0) 352 return ret; 353 if ((ret = dvb_ca_en50221_wait_if_status(ca, slot, STATUSREG_DA, HZ / 10)) != 0) 354 return ret; 355 if ((ret = dvb_ca_en50221_read_data(ca, slot, buf, 2)) != 2) 356 return -EIO; 357 if ((ret = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, IRQEN)) != 0) 358 return ret; 359 360 /* store it, and choose the minimum of our buffer and the CAM's buffer size */ 361 buf_size = (buf[0] << 8) | buf[1]; 362 if (buf_size > HOST_LINK_BUF_SIZE) 363 buf_size = HOST_LINK_BUF_SIZE; 364 ca->slot_info[slot].link_buf_size = buf_size; 365 buf[0] = buf_size >> 8; 366 buf[1] = buf_size & 0xff; 367 dprintk("Chosen link buffer size of %i\n", buf_size); 368 369 /* write the buffer size to the CAM */ 370 if ((ret = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, IRQEN | CMDREG_SW)) != 0) 371 return ret; 372 if ((ret = dvb_ca_en50221_wait_if_status(ca, slot, STATUSREG_FR, HZ / 10)) != 0) 373 return ret; 374 if ((ret = dvb_ca_en50221_write_data(ca, slot, buf, 2)) != 2) 375 return -EIO; 376 if ((ret = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, IRQEN)) != 0) 377 return ret; 378 379 /* success */ 380 return 0; 381 } 382 383 /** 384 * dvb_ca_en50221_read_tuple - Read a tuple from attribute memory. 385 * 386 * @ca: CA instance. 387 * @slot: Slot id. 388 * @address: Address to read from. Updated. 389 * @tupleType: Tuple id byte. Updated. 390 * @tupleLength: Tuple length. Updated. 391 * @tuple: Dest buffer for tuple (must be 256 bytes). Updated. 392 * 393 * @return 0 on success, nonzero on error. 394 */ 395 static int dvb_ca_en50221_read_tuple(struct dvb_ca_private *ca, int slot, 396 int *address, int *tupleType, int *tupleLength, u8 * tuple) 397 { 398 int i; 399 int _tupleType; 400 int _tupleLength; 401 int _address = *address; 402 403 /* grab the next tuple length and type */ 404 if ((_tupleType = ca->pub->read_attribute_mem(ca->pub, slot, _address)) < 0) 405 return _tupleType; 406 if (_tupleType == 0xff) { 407 dprintk("END OF CHAIN TUPLE type:0x%x\n", _tupleType); 408 *address += 2; 409 *tupleType = _tupleType; 410 *tupleLength = 0; 411 return 0; 412 } 413 if ((_tupleLength = ca->pub->read_attribute_mem(ca->pub, slot, _address + 2)) < 0) 414 return _tupleLength; 415 _address += 4; 416 417 dprintk("TUPLE type:0x%x length:%i\n", _tupleType, _tupleLength); 418 419 /* read in the whole tuple */ 420 for (i = 0; i < _tupleLength; i++) { 421 tuple[i] = ca->pub->read_attribute_mem(ca->pub, slot, _address + (i * 2)); 422 dprintk(" 0x%02x: 0x%02x %c\n", 423 i, tuple[i] & 0xff, 424 ((tuple[i] > 31) && (tuple[i] < 127)) ? tuple[i] : '.'); 425 } 426 _address += (_tupleLength * 2); 427 428 // success 429 *tupleType = _tupleType; 430 *tupleLength = _tupleLength; 431 *address = _address; 432 return 0; 433 } 434 435 436 /** 437 * dvb_ca_en50221_parse_attributes - Parse attribute memory of a CAM module, 438 * extracting Config register, and checking it is a DVB CAM module. 439 * 440 * @ca: CA instance. 441 * @slot: Slot id. 442 * 443 * @return 0 on success, <0 on failure. 444 */ 445 static int dvb_ca_en50221_parse_attributes(struct dvb_ca_private *ca, int slot) 446 { 447 int address = 0; 448 int tupleLength; 449 int tupleType; 450 u8 tuple[257]; 451 char *dvb_str; 452 int rasz; 453 int status; 454 int got_cftableentry = 0; 455 int end_chain = 0; 456 int i; 457 u16 manfid = 0; 458 u16 devid = 0; 459 460 461 // CISTPL_DEVICE_0A 462 if ((status = 463 dvb_ca_en50221_read_tuple(ca, slot, &address, &tupleType, &tupleLength, tuple)) < 0) 464 return status; 465 if (tupleType != 0x1D) 466 return -EINVAL; 467 468 469 470 // CISTPL_DEVICE_0C 471 if ((status = 472 dvb_ca_en50221_read_tuple(ca, slot, &address, &tupleType, &tupleLength, tuple)) < 0) 473 return status; 474 if (tupleType != 0x1C) 475 return -EINVAL; 476 477 478 479 // CISTPL_VERS_1 480 if ((status = 481 dvb_ca_en50221_read_tuple(ca, slot, &address, &tupleType, &tupleLength, tuple)) < 0) 482 return status; 483 if (tupleType != 0x15) 484 return -EINVAL; 485 486 487 488 // CISTPL_MANFID 489 if ((status = dvb_ca_en50221_read_tuple(ca, slot, &address, &tupleType, 490 &tupleLength, tuple)) < 0) 491 return status; 492 if (tupleType != 0x20) 493 return -EINVAL; 494 if (tupleLength != 4) 495 return -EINVAL; 496 manfid = (tuple[1] << 8) | tuple[0]; 497 devid = (tuple[3] << 8) | tuple[2]; 498 499 500 501 // CISTPL_CONFIG 502 if ((status = dvb_ca_en50221_read_tuple(ca, slot, &address, &tupleType, 503 &tupleLength, tuple)) < 0) 504 return status; 505 if (tupleType != 0x1A) 506 return -EINVAL; 507 if (tupleLength < 3) 508 return -EINVAL; 509 510 /* extract the configbase */ 511 rasz = tuple[0] & 3; 512 if (tupleLength < (3 + rasz + 14)) 513 return -EINVAL; 514 ca->slot_info[slot].config_base = 0; 515 for (i = 0; i < rasz + 1; i++) { 516 ca->slot_info[slot].config_base |= (tuple[2 + i] << (8 * i)); 517 } 518 519 /* check it contains the correct DVB string */ 520 dvb_str = findstr((char *)tuple, tupleLength, "DVB_CI_V", 8); 521 if (dvb_str == NULL) 522 return -EINVAL; 523 if (tupleLength < ((dvb_str - (char *) tuple) + 12)) 524 return -EINVAL; 525 526 /* is it a version we support? */ 527 if (strncmp(dvb_str + 8, "1.00", 4)) { 528 pr_err("dvb_ca adapter %d: Unsupported DVB CAM module version %c%c%c%c\n", 529 ca->dvbdev->adapter->num, dvb_str[8], dvb_str[9], 530 dvb_str[10], dvb_str[11]); 531 return -EINVAL; 532 } 533 534 /* process the CFTABLE_ENTRY tuples, and any after those */ 535 while ((!end_chain) && (address < 0x1000)) { 536 if ((status = dvb_ca_en50221_read_tuple(ca, slot, &address, &tupleType, 537 &tupleLength, tuple)) < 0) 538 return status; 539 switch (tupleType) { 540 case 0x1B: // CISTPL_CFTABLE_ENTRY 541 if (tupleLength < (2 + 11 + 17)) 542 break; 543 544 /* if we've already parsed one, just use it */ 545 if (got_cftableentry) 546 break; 547 548 /* get the config option */ 549 ca->slot_info[slot].config_option = tuple[0] & 0x3f; 550 551 /* OK, check it contains the correct strings */ 552 if ((findstr((char *)tuple, tupleLength, "DVB_HOST", 8) == NULL) || 553 (findstr((char *)tuple, tupleLength, "DVB_CI_MODULE", 13) == NULL)) 554 break; 555 556 got_cftableentry = 1; 557 break; 558 559 case 0x14: // CISTPL_NO_LINK 560 break; 561 562 case 0xFF: // CISTPL_END 563 end_chain = 1; 564 break; 565 566 default: /* Unknown tuple type - just skip this tuple and move to the next one */ 567 dprintk("dvb_ca: Skipping unknown tuple type:0x%x length:0x%x\n", 568 tupleType, tupleLength); 569 break; 570 } 571 } 572 573 if ((address > 0x1000) || (!got_cftableentry)) 574 return -EINVAL; 575 576 dprintk("Valid DVB CAM detected MANID:%x DEVID:%x CONFIGBASE:0x%x CONFIGOPTION:0x%x\n", 577 manfid, devid, ca->slot_info[slot].config_base, 578 ca->slot_info[slot].config_option); 579 580 // success! 581 return 0; 582 } 583 584 585 /** 586 * dvb_ca_en50221_set_configoption - Set CAM's configoption correctly. 587 * 588 * @ca: CA instance. 589 * @slot: Slot containing the CAM. 590 */ 591 static int dvb_ca_en50221_set_configoption(struct dvb_ca_private *ca, int slot) 592 { 593 int configoption; 594 595 dprintk("%s\n", __func__); 596 597 /* set the config option */ 598 ca->pub->write_attribute_mem(ca->pub, slot, 599 ca->slot_info[slot].config_base, 600 ca->slot_info[slot].config_option); 601 602 /* check it */ 603 configoption = ca->pub->read_attribute_mem(ca->pub, slot, ca->slot_info[slot].config_base); 604 dprintk("Set configoption 0x%x, read configoption 0x%x\n", 605 ca->slot_info[slot].config_option, configoption & 0x3f); 606 607 /* fine! */ 608 return 0; 609 610 } 611 612 613 /** 614 * dvb_ca_en50221_read_data - This function talks to an EN50221 CAM control 615 * interface. It reads a buffer of data from the CAM. The data can either 616 * be stored in a supplied buffer, or automatically be added to the slot's 617 * rx_buffer. 618 * 619 * @ca: CA instance. 620 * @slot: Slot to read from. 621 * @ebuf: If non-NULL, the data will be written to this buffer. If NULL, 622 * the data will be added into the buffering system as a normal fragment. 623 * @ecount: Size of ebuf. Ignored if ebuf is NULL. 624 * 625 * @return Number of bytes read, or < 0 on error 626 */ 627 static int dvb_ca_en50221_read_data(struct dvb_ca_private *ca, int slot, u8 * ebuf, int ecount) 628 { 629 int bytes_read; 630 int status; 631 u8 buf[HOST_LINK_BUF_SIZE]; 632 int i; 633 634 dprintk("%s\n", __func__); 635 636 /* check if we have space for a link buf in the rx_buffer */ 637 if (ebuf == NULL) { 638 int buf_free; 639 640 if (ca->slot_info[slot].rx_buffer.data == NULL) { 641 status = -EIO; 642 goto exit; 643 } 644 buf_free = dvb_ringbuffer_free(&ca->slot_info[slot].rx_buffer); 645 646 if (buf_free < (ca->slot_info[slot].link_buf_size + DVB_RINGBUFFER_PKTHDRSIZE)) { 647 status = -EAGAIN; 648 goto exit; 649 } 650 } 651 652 /* check if there is data available */ 653 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS)) < 0) 654 goto exit; 655 if (!(status & STATUSREG_DA)) { 656 /* no data */ 657 status = 0; 658 goto exit; 659 } 660 661 /* read the amount of data */ 662 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_SIZE_HIGH)) < 0) 663 goto exit; 664 bytes_read = status << 8; 665 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_SIZE_LOW)) < 0) 666 goto exit; 667 bytes_read |= status; 668 669 /* check it will fit */ 670 if (ebuf == NULL) { 671 if (bytes_read > ca->slot_info[slot].link_buf_size) { 672 pr_err("dvb_ca adapter %d: CAM tried to send a buffer larger than the link buffer size (%i > %i)!\n", 673 ca->dvbdev->adapter->num, bytes_read, 674 ca->slot_info[slot].link_buf_size); 675 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_LINKINIT; 676 status = -EIO; 677 goto exit; 678 } 679 if (bytes_read < 2) { 680 pr_err("dvb_ca adapter %d: CAM sent a buffer that was less than 2 bytes!\n", 681 ca->dvbdev->adapter->num); 682 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_LINKINIT; 683 status = -EIO; 684 goto exit; 685 } 686 } else { 687 if (bytes_read > ecount) { 688 pr_err("dvb_ca adapter %d: CAM tried to send a buffer larger than the ecount size!\n", 689 ca->dvbdev->adapter->num); 690 status = -EIO; 691 goto exit; 692 } 693 } 694 695 /* fill the buffer */ 696 for (i = 0; i < bytes_read; i++) { 697 /* read byte and check */ 698 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_DATA)) < 0) 699 goto exit; 700 701 /* OK, store it in the buffer */ 702 buf[i] = status; 703 } 704 705 /* check for read error (RE should now be 0) */ 706 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS)) < 0) 707 goto exit; 708 if (status & STATUSREG_RE) { 709 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_LINKINIT; 710 status = -EIO; 711 goto exit; 712 } 713 714 /* OK, add it to the receive buffer, or copy into external buffer if supplied */ 715 if (ebuf == NULL) { 716 if (ca->slot_info[slot].rx_buffer.data == NULL) { 717 status = -EIO; 718 goto exit; 719 } 720 dvb_ringbuffer_pkt_write(&ca->slot_info[slot].rx_buffer, buf, bytes_read); 721 } else { 722 memcpy(ebuf, buf, bytes_read); 723 } 724 725 dprintk("Received CA packet for slot %i connection id 0x%x last_frag:%i size:0x%x\n", slot, 726 buf[0], (buf[1] & 0x80) == 0, bytes_read); 727 728 /* wake up readers when a last_fragment is received */ 729 if ((buf[1] & 0x80) == 0x00) { 730 wake_up_interruptible(&ca->wait_queue); 731 } 732 status = bytes_read; 733 734 exit: 735 return status; 736 } 737 738 739 /** 740 * dvb_ca_en50221_write_data - This function talks to an EN50221 CAM control 741 * interface. It writes a buffer of data to a CAM. 742 * 743 * @ca: CA instance. 744 * @slot: Slot to write to. 745 * @ebuf: The data in this buffer is treated as a complete link-level packet to 746 * be written. 747 * @count: Size of ebuf. 748 * 749 * @return Number of bytes written, or < 0 on error. 750 */ 751 static int dvb_ca_en50221_write_data(struct dvb_ca_private *ca, int slot, u8 * buf, int bytes_write) 752 { 753 int status; 754 int i; 755 756 dprintk("%s\n", __func__); 757 758 759 /* sanity check */ 760 if (bytes_write > ca->slot_info[slot].link_buf_size) 761 return -EINVAL; 762 763 /* it is possible we are dealing with a single buffer implementation, 764 thus if there is data available for read or if there is even a read 765 already in progress, we do nothing but awake the kernel thread to 766 process the data if necessary. */ 767 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS)) < 0) 768 goto exitnowrite; 769 if (status & (STATUSREG_DA | STATUSREG_RE)) { 770 if (status & STATUSREG_DA) 771 dvb_ca_en50221_thread_wakeup(ca); 772 773 status = -EAGAIN; 774 goto exitnowrite; 775 } 776 777 /* OK, set HC bit */ 778 if ((status = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, 779 IRQEN | CMDREG_HC)) != 0) 780 goto exit; 781 782 /* check if interface is still free */ 783 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS)) < 0) 784 goto exit; 785 if (!(status & STATUSREG_FR)) { 786 /* it wasn't free => try again later */ 787 status = -EAGAIN; 788 goto exit; 789 } 790 791 /* send the amount of data */ 792 if ((status = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_SIZE_HIGH, bytes_write >> 8)) != 0) 793 goto exit; 794 if ((status = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_SIZE_LOW, 795 bytes_write & 0xff)) != 0) 796 goto exit; 797 798 /* send the buffer */ 799 for (i = 0; i < bytes_write; i++) { 800 if ((status = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_DATA, buf[i])) != 0) 801 goto exit; 802 } 803 804 /* check for write error (WE should now be 0) */ 805 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS)) < 0) 806 goto exit; 807 if (status & STATUSREG_WE) { 808 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_LINKINIT; 809 status = -EIO; 810 goto exit; 811 } 812 status = bytes_write; 813 814 dprintk("Wrote CA packet for slot %i, connection id 0x%x last_frag:%i size:0x%x\n", slot, 815 buf[0], (buf[1] & 0x80) == 0, bytes_write); 816 817 exit: 818 ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, IRQEN); 819 820 exitnowrite: 821 return status; 822 } 823 EXPORT_SYMBOL(dvb_ca_en50221_camchange_irq); 824 825 826 827 /* ******************************************************************************** */ 828 /* EN50221 higher level functions */ 829 830 831 /** 832 * dvb_ca_en50221_camready_irq - A CAM has been removed => shut it down. 833 * 834 * @ca: CA instance. 835 * @slot: Slot to shut down. 836 */ 837 static int dvb_ca_en50221_slot_shutdown(struct dvb_ca_private *ca, int slot) 838 { 839 dprintk("%s\n", __func__); 840 841 ca->pub->slot_shutdown(ca->pub, slot); 842 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_NONE; 843 844 /* need to wake up all processes to check if they're now 845 trying to write to a defunct CAM */ 846 wake_up_interruptible(&ca->wait_queue); 847 848 dprintk("Slot %i shutdown\n", slot); 849 850 /* success */ 851 return 0; 852 } 853 EXPORT_SYMBOL(dvb_ca_en50221_camready_irq); 854 855 856 /** 857 * dvb_ca_en50221_camready_irq - A CAMCHANGE IRQ has occurred. 858 * 859 * @ca: CA instance. 860 * @slot: Slot concerned. 861 * @change_type: One of the DVB_CA_CAMCHANGE_* values. 862 */ 863 void dvb_ca_en50221_camchange_irq(struct dvb_ca_en50221 *pubca, int slot, int change_type) 864 { 865 struct dvb_ca_private *ca = pubca->private; 866 867 dprintk("CAMCHANGE IRQ slot:%i change_type:%i\n", slot, change_type); 868 869 switch (change_type) { 870 case DVB_CA_EN50221_CAMCHANGE_REMOVED: 871 case DVB_CA_EN50221_CAMCHANGE_INSERTED: 872 break; 873 874 default: 875 return; 876 } 877 878 ca->slot_info[slot].camchange_type = change_type; 879 atomic_inc(&ca->slot_info[slot].camchange_count); 880 dvb_ca_en50221_thread_wakeup(ca); 881 } 882 EXPORT_SYMBOL(dvb_ca_en50221_frda_irq); 883 884 885 /** 886 * dvb_ca_en50221_camready_irq - A CAMREADY IRQ has occurred. 887 * 888 * @ca: CA instance. 889 * @slot: Slot concerned. 890 */ 891 void dvb_ca_en50221_camready_irq(struct dvb_ca_en50221 *pubca, int slot) 892 { 893 struct dvb_ca_private *ca = pubca->private; 894 895 dprintk("CAMREADY IRQ slot:%i\n", slot); 896 897 if (ca->slot_info[slot].slot_state == DVB_CA_SLOTSTATE_WAITREADY) { 898 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_VALIDATE; 899 dvb_ca_en50221_thread_wakeup(ca); 900 } 901 } 902 903 904 /** 905 * An FR or DA IRQ has occurred. 906 * 907 * @ca: CA instance. 908 * @slot: Slot concerned. 909 */ 910 void dvb_ca_en50221_frda_irq(struct dvb_ca_en50221 *pubca, int slot) 911 { 912 struct dvb_ca_private *ca = pubca->private; 913 int flags; 914 915 dprintk("FR/DA IRQ slot:%i\n", slot); 916 917 switch (ca->slot_info[slot].slot_state) { 918 case DVB_CA_SLOTSTATE_LINKINIT: 919 flags = ca->pub->read_cam_control(pubca, slot, CTRLIF_STATUS); 920 if (flags & STATUSREG_DA) { 921 dprintk("CAM supports DA IRQ\n"); 922 ca->slot_info[slot].da_irq_supported = 1; 923 } 924 break; 925 926 case DVB_CA_SLOTSTATE_RUNNING: 927 if (ca->open) 928 dvb_ca_en50221_thread_wakeup(ca); 929 break; 930 } 931 } 932 933 934 935 /* ******************************************************************************** */ 936 /* EN50221 thread functions */ 937 938 /** 939 * Wake up the DVB CA thread 940 * 941 * @ca: CA instance. 942 */ 943 static void dvb_ca_en50221_thread_wakeup(struct dvb_ca_private *ca) 944 { 945 946 dprintk("%s\n", __func__); 947 948 ca->wakeup = 1; 949 mb(); 950 wake_up_process(ca->thread); 951 } 952 953 /** 954 * Update the delay used by the thread. 955 * 956 * @ca: CA instance. 957 */ 958 static void dvb_ca_en50221_thread_update_delay(struct dvb_ca_private *ca) 959 { 960 int delay; 961 int curdelay = 100000000; 962 int slot; 963 964 /* Beware of too high polling frequency, because one polling 965 * call might take several hundred milliseconds until timeout! 966 */ 967 for (slot = 0; slot < ca->slot_count; slot++) { 968 switch (ca->slot_info[slot].slot_state) { 969 default: 970 case DVB_CA_SLOTSTATE_NONE: 971 delay = HZ * 60; /* 60s */ 972 if (!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE)) 973 delay = HZ * 5; /* 5s */ 974 break; 975 case DVB_CA_SLOTSTATE_INVALID: 976 delay = HZ * 60; /* 60s */ 977 if (!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE)) 978 delay = HZ / 10; /* 100ms */ 979 break; 980 981 case DVB_CA_SLOTSTATE_UNINITIALISED: 982 case DVB_CA_SLOTSTATE_WAITREADY: 983 case DVB_CA_SLOTSTATE_VALIDATE: 984 case DVB_CA_SLOTSTATE_WAITFR: 985 case DVB_CA_SLOTSTATE_LINKINIT: 986 delay = HZ / 10; /* 100ms */ 987 break; 988 989 case DVB_CA_SLOTSTATE_RUNNING: 990 delay = HZ * 60; /* 60s */ 991 if (!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE)) 992 delay = HZ / 10; /* 100ms */ 993 if (ca->open) { 994 if ((!ca->slot_info[slot].da_irq_supported) || 995 (!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_DA))) 996 delay = HZ / 10; /* 100ms */ 997 } 998 break; 999 } 1000 1001 if (delay < curdelay) 1002 curdelay = delay; 1003 } 1004 1005 ca->delay = curdelay; 1006 } 1007 1008 1009 1010 /** 1011 * Kernel thread which monitors CA slots for CAM changes, and performs data transfers. 1012 */ 1013 static int dvb_ca_en50221_thread(void *data) 1014 { 1015 struct dvb_ca_private *ca = data; 1016 int slot; 1017 int flags; 1018 int status; 1019 int pktcount; 1020 void *rxbuf; 1021 1022 dprintk("%s\n", __func__); 1023 1024 /* choose the correct initial delay */ 1025 dvb_ca_en50221_thread_update_delay(ca); 1026 1027 /* main loop */ 1028 while (!kthread_should_stop()) { 1029 /* sleep for a bit */ 1030 if (!ca->wakeup) { 1031 set_current_state(TASK_INTERRUPTIBLE); 1032 schedule_timeout(ca->delay); 1033 if (kthread_should_stop()) 1034 return 0; 1035 } 1036 ca->wakeup = 0; 1037 1038 /* go through all the slots processing them */ 1039 for (slot = 0; slot < ca->slot_count; slot++) { 1040 1041 mutex_lock(&ca->slot_info[slot].slot_lock); 1042 1043 // check the cam status + deal with CAMCHANGEs 1044 while (dvb_ca_en50221_check_camstatus(ca, slot)) { 1045 /* clear down an old CI slot if necessary */ 1046 if (ca->slot_info[slot].slot_state != DVB_CA_SLOTSTATE_NONE) 1047 dvb_ca_en50221_slot_shutdown(ca, slot); 1048 1049 /* if a CAM is NOW present, initialise it */ 1050 if (ca->slot_info[slot].camchange_type == DVB_CA_EN50221_CAMCHANGE_INSERTED) { 1051 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_UNINITIALISED; 1052 } 1053 1054 /* we've handled one CAMCHANGE */ 1055 dvb_ca_en50221_thread_update_delay(ca); 1056 atomic_dec(&ca->slot_info[slot].camchange_count); 1057 } 1058 1059 // CAM state machine 1060 switch (ca->slot_info[slot].slot_state) { 1061 case DVB_CA_SLOTSTATE_NONE: 1062 case DVB_CA_SLOTSTATE_INVALID: 1063 // no action needed 1064 break; 1065 1066 case DVB_CA_SLOTSTATE_UNINITIALISED: 1067 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_WAITREADY; 1068 ca->pub->slot_reset(ca->pub, slot); 1069 ca->slot_info[slot].timeout = jiffies + (INIT_TIMEOUT_SECS * HZ); 1070 break; 1071 1072 case DVB_CA_SLOTSTATE_WAITREADY: 1073 if (time_after(jiffies, ca->slot_info[slot].timeout)) { 1074 pr_err("dvb_ca adaptor %d: PC card did not respond :(\n", 1075 ca->dvbdev->adapter->num); 1076 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID; 1077 dvb_ca_en50221_thread_update_delay(ca); 1078 break; 1079 } 1080 // no other action needed; will automatically change state when ready 1081 break; 1082 1083 case DVB_CA_SLOTSTATE_VALIDATE: 1084 if (dvb_ca_en50221_parse_attributes(ca, slot) != 0) { 1085 /* we need this extra check for annoying interfaces like the budget-av */ 1086 if ((!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE)) && 1087 (ca->pub->poll_slot_status)) { 1088 status = ca->pub->poll_slot_status(ca->pub, slot, 0); 1089 if (!(status & DVB_CA_EN50221_POLL_CAM_PRESENT)) { 1090 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_NONE; 1091 dvb_ca_en50221_thread_update_delay(ca); 1092 break; 1093 } 1094 } 1095 1096 pr_err("dvb_ca adapter %d: Invalid PC card inserted :(\n", 1097 ca->dvbdev->adapter->num); 1098 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID; 1099 dvb_ca_en50221_thread_update_delay(ca); 1100 break; 1101 } 1102 if (dvb_ca_en50221_set_configoption(ca, slot) != 0) { 1103 pr_err("dvb_ca adapter %d: Unable to initialise CAM :(\n", 1104 ca->dvbdev->adapter->num); 1105 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID; 1106 dvb_ca_en50221_thread_update_delay(ca); 1107 break; 1108 } 1109 if (ca->pub->write_cam_control(ca->pub, slot, 1110 CTRLIF_COMMAND, CMDREG_RS) != 0) { 1111 pr_err("dvb_ca adapter %d: Unable to reset CAM IF\n", 1112 ca->dvbdev->adapter->num); 1113 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID; 1114 dvb_ca_en50221_thread_update_delay(ca); 1115 break; 1116 } 1117 dprintk("DVB CAM validated successfully\n"); 1118 1119 ca->slot_info[slot].timeout = jiffies + (INIT_TIMEOUT_SECS * HZ); 1120 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_WAITFR; 1121 ca->wakeup = 1; 1122 break; 1123 1124 case DVB_CA_SLOTSTATE_WAITFR: 1125 if (time_after(jiffies, ca->slot_info[slot].timeout)) { 1126 pr_err("dvb_ca adapter %d: DVB CAM did not respond :(\n", 1127 ca->dvbdev->adapter->num); 1128 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID; 1129 dvb_ca_en50221_thread_update_delay(ca); 1130 break; 1131 } 1132 1133 flags = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS); 1134 if (flags & STATUSREG_FR) { 1135 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_LINKINIT; 1136 ca->wakeup = 1; 1137 } 1138 break; 1139 1140 case DVB_CA_SLOTSTATE_LINKINIT: 1141 if (dvb_ca_en50221_link_init(ca, slot) != 0) { 1142 /* we need this extra check for annoying interfaces like the budget-av */ 1143 if ((!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE)) && 1144 (ca->pub->poll_slot_status)) { 1145 status = ca->pub->poll_slot_status(ca->pub, slot, 0); 1146 if (!(status & DVB_CA_EN50221_POLL_CAM_PRESENT)) { 1147 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_NONE; 1148 dvb_ca_en50221_thread_update_delay(ca); 1149 break; 1150 } 1151 } 1152 1153 pr_err("dvb_ca adapter %d: DVB CAM link initialisation failed :(\n", 1154 ca->dvbdev->adapter->num); 1155 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID; 1156 dvb_ca_en50221_thread_update_delay(ca); 1157 break; 1158 } 1159 1160 if (ca->slot_info[slot].rx_buffer.data == NULL) { 1161 rxbuf = vmalloc(RX_BUFFER_SIZE); 1162 if (rxbuf == NULL) { 1163 pr_err("dvb_ca adapter %d: Unable to allocate CAM rx buffer :(\n", 1164 ca->dvbdev->adapter->num); 1165 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID; 1166 dvb_ca_en50221_thread_update_delay(ca); 1167 break; 1168 } 1169 dvb_ringbuffer_init(&ca->slot_info[slot].rx_buffer, rxbuf, RX_BUFFER_SIZE); 1170 } 1171 1172 ca->pub->slot_ts_enable(ca->pub, slot); 1173 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_RUNNING; 1174 dvb_ca_en50221_thread_update_delay(ca); 1175 pr_err("dvb_ca adapter %d: DVB CAM detected and initialised successfully\n", 1176 ca->dvbdev->adapter->num); 1177 break; 1178 1179 case DVB_CA_SLOTSTATE_RUNNING: 1180 if (!ca->open) 1181 break; 1182 1183 // poll slots for data 1184 pktcount = 0; 1185 while ((status = dvb_ca_en50221_read_data(ca, slot, NULL, 0)) > 0) { 1186 if (!ca->open) 1187 break; 1188 1189 /* if a CAMCHANGE occurred at some point, do not do any more processing of this slot */ 1190 if (dvb_ca_en50221_check_camstatus(ca, slot)) { 1191 // we dont want to sleep on the next iteration so we can handle the cam change 1192 ca->wakeup = 1; 1193 break; 1194 } 1195 1196 /* check if we've hit our limit this time */ 1197 if (++pktcount >= MAX_RX_PACKETS_PER_ITERATION) { 1198 // dont sleep; there is likely to be more data to read 1199 ca->wakeup = 1; 1200 break; 1201 } 1202 } 1203 break; 1204 } 1205 1206 mutex_unlock(&ca->slot_info[slot].slot_lock); 1207 } 1208 } 1209 1210 return 0; 1211 } 1212 1213 1214 1215 /* ******************************************************************************** */ 1216 /* EN50221 IO interface functions */ 1217 1218 /** 1219 * Real ioctl implementation. 1220 * NOTE: CA_SEND_MSG/CA_GET_MSG ioctls have userspace buffers passed to them. 1221 * 1222 * @inode: Inode concerned. 1223 * @file: File concerned. 1224 * @cmd: IOCTL command. 1225 * @arg: Associated argument. 1226 * 1227 * @return 0 on success, <0 on error. 1228 */ 1229 static int dvb_ca_en50221_io_do_ioctl(struct file *file, 1230 unsigned int cmd, void *parg) 1231 { 1232 struct dvb_device *dvbdev = file->private_data; 1233 struct dvb_ca_private *ca = dvbdev->priv; 1234 int err = 0; 1235 int slot; 1236 1237 dprintk("%s\n", __func__); 1238 1239 if (mutex_lock_interruptible(&ca->ioctl_mutex)) 1240 return -ERESTARTSYS; 1241 1242 switch (cmd) { 1243 case CA_RESET: 1244 for (slot = 0; slot < ca->slot_count; slot++) { 1245 mutex_lock(&ca->slot_info[slot].slot_lock); 1246 if (ca->slot_info[slot].slot_state != DVB_CA_SLOTSTATE_NONE) { 1247 dvb_ca_en50221_slot_shutdown(ca, slot); 1248 if (ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE) 1249 dvb_ca_en50221_camchange_irq(ca->pub, 1250 slot, 1251 DVB_CA_EN50221_CAMCHANGE_INSERTED); 1252 } 1253 mutex_unlock(&ca->slot_info[slot].slot_lock); 1254 } 1255 ca->next_read_slot = 0; 1256 dvb_ca_en50221_thread_wakeup(ca); 1257 break; 1258 1259 case CA_GET_CAP: { 1260 struct ca_caps *caps = parg; 1261 1262 caps->slot_num = ca->slot_count; 1263 caps->slot_type = CA_CI_LINK; 1264 caps->descr_num = 0; 1265 caps->descr_type = 0; 1266 break; 1267 } 1268 1269 case CA_GET_SLOT_INFO: { 1270 struct ca_slot_info *info = parg; 1271 1272 if ((info->num > ca->slot_count) || (info->num < 0)) { 1273 err = -EINVAL; 1274 goto out_unlock; 1275 } 1276 1277 info->type = CA_CI_LINK; 1278 info->flags = 0; 1279 if ((ca->slot_info[info->num].slot_state != DVB_CA_SLOTSTATE_NONE) 1280 && (ca->slot_info[info->num].slot_state != DVB_CA_SLOTSTATE_INVALID)) { 1281 info->flags = CA_CI_MODULE_PRESENT; 1282 } 1283 if (ca->slot_info[info->num].slot_state == DVB_CA_SLOTSTATE_RUNNING) { 1284 info->flags |= CA_CI_MODULE_READY; 1285 } 1286 break; 1287 } 1288 1289 default: 1290 err = -EINVAL; 1291 break; 1292 } 1293 1294 out_unlock: 1295 mutex_unlock(&ca->ioctl_mutex); 1296 return err; 1297 } 1298 1299 1300 /** 1301 * Wrapper for ioctl implementation. 1302 * 1303 * @inode: Inode concerned. 1304 * @file: File concerned. 1305 * @cmd: IOCTL command. 1306 * @arg: Associated argument. 1307 * 1308 * @return 0 on success, <0 on error. 1309 */ 1310 static long dvb_ca_en50221_io_ioctl(struct file *file, 1311 unsigned int cmd, unsigned long arg) 1312 { 1313 return dvb_usercopy(file, cmd, arg, dvb_ca_en50221_io_do_ioctl); 1314 } 1315 1316 1317 /** 1318 * Implementation of write() syscall. 1319 * 1320 * @file: File structure. 1321 * @buf: Source buffer. 1322 * @count: Size of source buffer. 1323 * @ppos: Position in file (ignored). 1324 * 1325 * @return Number of bytes read, or <0 on error. 1326 */ 1327 static ssize_t dvb_ca_en50221_io_write(struct file *file, 1328 const char __user * buf, size_t count, loff_t * ppos) 1329 { 1330 struct dvb_device *dvbdev = file->private_data; 1331 struct dvb_ca_private *ca = dvbdev->priv; 1332 u8 slot, connection_id; 1333 int status; 1334 u8 fragbuf[HOST_LINK_BUF_SIZE]; 1335 int fragpos = 0; 1336 int fraglen; 1337 unsigned long timeout; 1338 int written; 1339 1340 dprintk("%s\n", __func__); 1341 1342 /* Incoming packet has a 2 byte header. hdr[0] = slot_id, hdr[1] = connection_id */ 1343 if (count < 2) 1344 return -EINVAL; 1345 1346 /* extract slot & connection id */ 1347 if (copy_from_user(&slot, buf, 1)) 1348 return -EFAULT; 1349 if (copy_from_user(&connection_id, buf + 1, 1)) 1350 return -EFAULT; 1351 buf += 2; 1352 count -= 2; 1353 1354 /* check if the slot is actually running */ 1355 if (ca->slot_info[slot].slot_state != DVB_CA_SLOTSTATE_RUNNING) 1356 return -EINVAL; 1357 1358 /* fragment the packets & store in the buffer */ 1359 while (fragpos < count) { 1360 fraglen = ca->slot_info[slot].link_buf_size - 2; 1361 if (fraglen < 0) 1362 break; 1363 if (fraglen > HOST_LINK_BUF_SIZE - 2) 1364 fraglen = HOST_LINK_BUF_SIZE - 2; 1365 if ((count - fragpos) < fraglen) 1366 fraglen = count - fragpos; 1367 1368 fragbuf[0] = connection_id; 1369 fragbuf[1] = ((fragpos + fraglen) < count) ? 0x80 : 0x00; 1370 status = copy_from_user(fragbuf + 2, buf + fragpos, fraglen); 1371 if (status) { 1372 status = -EFAULT; 1373 goto exit; 1374 } 1375 1376 timeout = jiffies + HZ / 2; 1377 written = 0; 1378 while (!time_after(jiffies, timeout)) { 1379 /* check the CAM hasn't been removed/reset in the meantime */ 1380 if (ca->slot_info[slot].slot_state != DVB_CA_SLOTSTATE_RUNNING) { 1381 status = -EIO; 1382 goto exit; 1383 } 1384 1385 mutex_lock(&ca->slot_info[slot].slot_lock); 1386 status = dvb_ca_en50221_write_data(ca, slot, fragbuf, fraglen + 2); 1387 mutex_unlock(&ca->slot_info[slot].slot_lock); 1388 if (status == (fraglen + 2)) { 1389 written = 1; 1390 break; 1391 } 1392 if (status != -EAGAIN) 1393 goto exit; 1394 1395 msleep(1); 1396 } 1397 if (!written) { 1398 status = -EIO; 1399 goto exit; 1400 } 1401 1402 fragpos += fraglen; 1403 } 1404 status = count + 2; 1405 1406 exit: 1407 return status; 1408 } 1409 1410 1411 /** 1412 * Condition for waking up in dvb_ca_en50221_io_read_condition 1413 */ 1414 static int dvb_ca_en50221_io_read_condition(struct dvb_ca_private *ca, 1415 int *result, int *_slot) 1416 { 1417 int slot; 1418 int slot_count = 0; 1419 int idx; 1420 size_t fraglen; 1421 int connection_id = -1; 1422 int found = 0; 1423 u8 hdr[2]; 1424 1425 slot = ca->next_read_slot; 1426 while ((slot_count < ca->slot_count) && (!found)) { 1427 if (ca->slot_info[slot].slot_state != DVB_CA_SLOTSTATE_RUNNING) 1428 goto nextslot; 1429 1430 if (ca->slot_info[slot].rx_buffer.data == NULL) { 1431 return 0; 1432 } 1433 1434 idx = dvb_ringbuffer_pkt_next(&ca->slot_info[slot].rx_buffer, -1, &fraglen); 1435 while (idx != -1) { 1436 dvb_ringbuffer_pkt_read(&ca->slot_info[slot].rx_buffer, idx, 0, hdr, 2); 1437 if (connection_id == -1) 1438 connection_id = hdr[0]; 1439 if ((hdr[0] == connection_id) && ((hdr[1] & 0x80) == 0)) { 1440 *_slot = slot; 1441 found = 1; 1442 break; 1443 } 1444 1445 idx = dvb_ringbuffer_pkt_next(&ca->slot_info[slot].rx_buffer, idx, &fraglen); 1446 } 1447 1448 nextslot: 1449 slot = (slot + 1) % ca->slot_count; 1450 slot_count++; 1451 } 1452 1453 ca->next_read_slot = slot; 1454 return found; 1455 } 1456 1457 1458 /** 1459 * Implementation of read() syscall. 1460 * 1461 * @file: File structure. 1462 * @buf: Destination buffer. 1463 * @count: Size of destination buffer. 1464 * @ppos: Position in file (ignored). 1465 * 1466 * @return Number of bytes read, or <0 on error. 1467 */ 1468 static ssize_t dvb_ca_en50221_io_read(struct file *file, char __user * buf, 1469 size_t count, loff_t * ppos) 1470 { 1471 struct dvb_device *dvbdev = file->private_data; 1472 struct dvb_ca_private *ca = dvbdev->priv; 1473 int status; 1474 int result = 0; 1475 u8 hdr[2]; 1476 int slot; 1477 int connection_id = -1; 1478 size_t idx, idx2; 1479 int last_fragment = 0; 1480 size_t fraglen; 1481 int pktlen; 1482 int dispose = 0; 1483 1484 dprintk("%s\n", __func__); 1485 1486 /* Outgoing packet has a 2 byte header. hdr[0] = slot_id, hdr[1] = connection_id */ 1487 if (count < 2) 1488 return -EINVAL; 1489 1490 /* wait for some data */ 1491 if ((status = dvb_ca_en50221_io_read_condition(ca, &result, &slot)) == 0) { 1492 1493 /* if we're in nonblocking mode, exit immediately */ 1494 if (file->f_flags & O_NONBLOCK) 1495 return -EWOULDBLOCK; 1496 1497 /* wait for some data */ 1498 status = wait_event_interruptible(ca->wait_queue, 1499 dvb_ca_en50221_io_read_condition 1500 (ca, &result, &slot)); 1501 } 1502 if ((status < 0) || (result < 0)) { 1503 if (result) 1504 return result; 1505 return status; 1506 } 1507 1508 idx = dvb_ringbuffer_pkt_next(&ca->slot_info[slot].rx_buffer, -1, &fraglen); 1509 pktlen = 2; 1510 do { 1511 if (idx == -1) { 1512 pr_err("dvb_ca adapter %d: BUG: read packet ended before last_fragment encountered\n", 1513 ca->dvbdev->adapter->num); 1514 status = -EIO; 1515 goto exit; 1516 } 1517 1518 dvb_ringbuffer_pkt_read(&ca->slot_info[slot].rx_buffer, idx, 0, hdr, 2); 1519 if (connection_id == -1) 1520 connection_id = hdr[0]; 1521 if (hdr[0] == connection_id) { 1522 if (pktlen < count) { 1523 if ((pktlen + fraglen - 2) > count) { 1524 fraglen = count - pktlen; 1525 } else { 1526 fraglen -= 2; 1527 } 1528 1529 if ((status = dvb_ringbuffer_pkt_read_user(&ca->slot_info[slot].rx_buffer, idx, 2, 1530 buf + pktlen, fraglen)) < 0) { 1531 goto exit; 1532 } 1533 pktlen += fraglen; 1534 } 1535 1536 if ((hdr[1] & 0x80) == 0) 1537 last_fragment = 1; 1538 dispose = 1; 1539 } 1540 1541 idx2 = dvb_ringbuffer_pkt_next(&ca->slot_info[slot].rx_buffer, idx, &fraglen); 1542 if (dispose) 1543 dvb_ringbuffer_pkt_dispose(&ca->slot_info[slot].rx_buffer, idx); 1544 idx = idx2; 1545 dispose = 0; 1546 } while (!last_fragment); 1547 1548 hdr[0] = slot; 1549 hdr[1] = connection_id; 1550 status = copy_to_user(buf, hdr, 2); 1551 if (status) { 1552 status = -EFAULT; 1553 goto exit; 1554 } 1555 status = pktlen; 1556 1557 exit: 1558 return status; 1559 } 1560 1561 1562 /** 1563 * Implementation of file open syscall. 1564 * 1565 * @inode: Inode concerned. 1566 * @file: File concerned. 1567 * 1568 * @return 0 on success, <0 on failure. 1569 */ 1570 static int dvb_ca_en50221_io_open(struct inode *inode, struct file *file) 1571 { 1572 struct dvb_device *dvbdev = file->private_data; 1573 struct dvb_ca_private *ca = dvbdev->priv; 1574 int err; 1575 int i; 1576 1577 dprintk("%s\n", __func__); 1578 1579 if (!try_module_get(ca->pub->owner)) 1580 return -EIO; 1581 1582 err = dvb_generic_open(inode, file); 1583 if (err < 0) { 1584 module_put(ca->pub->owner); 1585 return err; 1586 } 1587 1588 for (i = 0; i < ca->slot_count; i++) { 1589 1590 if (ca->slot_info[i].slot_state == DVB_CA_SLOTSTATE_RUNNING) { 1591 if (ca->slot_info[i].rx_buffer.data != NULL) { 1592 /* it is safe to call this here without locks because 1593 * ca->open == 0. Data is not read in this case */ 1594 dvb_ringbuffer_flush(&ca->slot_info[i].rx_buffer); 1595 } 1596 } 1597 } 1598 1599 ca->open = 1; 1600 dvb_ca_en50221_thread_update_delay(ca); 1601 dvb_ca_en50221_thread_wakeup(ca); 1602 1603 dvb_ca_private_get(ca); 1604 1605 return 0; 1606 } 1607 1608 1609 /** 1610 * Implementation of file close syscall. 1611 * 1612 * @inode: Inode concerned. 1613 * @file: File concerned. 1614 * 1615 * @return 0 on success, <0 on failure. 1616 */ 1617 static int dvb_ca_en50221_io_release(struct inode *inode, struct file *file) 1618 { 1619 struct dvb_device *dvbdev = file->private_data; 1620 struct dvb_ca_private *ca = dvbdev->priv; 1621 int err; 1622 1623 dprintk("%s\n", __func__); 1624 1625 /* mark the CA device as closed */ 1626 ca->open = 0; 1627 dvb_ca_en50221_thread_update_delay(ca); 1628 1629 err = dvb_generic_release(inode, file); 1630 1631 module_put(ca->pub->owner); 1632 1633 dvb_ca_private_put(ca); 1634 1635 return err; 1636 } 1637 1638 1639 /** 1640 * Implementation of poll() syscall. 1641 * 1642 * @file: File concerned. 1643 * @wait: poll wait table. 1644 * 1645 * @return Standard poll mask. 1646 */ 1647 static unsigned int dvb_ca_en50221_io_poll(struct file *file, poll_table * wait) 1648 { 1649 struct dvb_device *dvbdev = file->private_data; 1650 struct dvb_ca_private *ca = dvbdev->priv; 1651 unsigned int mask = 0; 1652 int slot; 1653 int result = 0; 1654 1655 dprintk("%s\n", __func__); 1656 1657 if (dvb_ca_en50221_io_read_condition(ca, &result, &slot) == 1) { 1658 mask |= POLLIN; 1659 } 1660 1661 /* if there is something, return now */ 1662 if (mask) 1663 return mask; 1664 1665 /* wait for something to happen */ 1666 poll_wait(file, &ca->wait_queue, wait); 1667 1668 if (dvb_ca_en50221_io_read_condition(ca, &result, &slot) == 1) { 1669 mask |= POLLIN; 1670 } 1671 1672 return mask; 1673 } 1674 EXPORT_SYMBOL(dvb_ca_en50221_init); 1675 1676 1677 static const struct file_operations dvb_ca_fops = { 1678 .owner = THIS_MODULE, 1679 .read = dvb_ca_en50221_io_read, 1680 .write = dvb_ca_en50221_io_write, 1681 .unlocked_ioctl = dvb_ca_en50221_io_ioctl, 1682 .open = dvb_ca_en50221_io_open, 1683 .release = dvb_ca_en50221_io_release, 1684 .poll = dvb_ca_en50221_io_poll, 1685 .llseek = noop_llseek, 1686 }; 1687 1688 static const struct dvb_device dvbdev_ca = { 1689 .priv = NULL, 1690 .users = 1, 1691 .readers = 1, 1692 .writers = 1, 1693 #if defined(CONFIG_MEDIA_CONTROLLER_DVB) 1694 .name = "dvb-ca-en50221", 1695 #endif 1696 .fops = &dvb_ca_fops, 1697 }; 1698 1699 /* ******************************************************************************** */ 1700 /* Initialisation/shutdown functions */ 1701 1702 1703 /** 1704 * Initialise a new DVB CA EN50221 interface device. 1705 * 1706 * @dvb_adapter: DVB adapter to attach the new CA device to. 1707 * @ca: The dvb_ca instance. 1708 * @flags: Flags describing the CA device (DVB_CA_FLAG_*). 1709 * @slot_count: Number of slots supported. 1710 * 1711 * @return 0 on success, nonzero on failure 1712 */ 1713 int dvb_ca_en50221_init(struct dvb_adapter *dvb_adapter, 1714 struct dvb_ca_en50221 *pubca, int flags, int slot_count) 1715 { 1716 int ret; 1717 struct dvb_ca_private *ca = NULL; 1718 int i; 1719 1720 dprintk("%s\n", __func__); 1721 1722 if (slot_count < 1) 1723 return -EINVAL; 1724 1725 /* initialise the system data */ 1726 if ((ca = kzalloc(sizeof(struct dvb_ca_private), GFP_KERNEL)) == NULL) { 1727 ret = -ENOMEM; 1728 goto exit; 1729 } 1730 kref_init(&ca->refcount); 1731 ca->pub = pubca; 1732 ca->flags = flags; 1733 ca->slot_count = slot_count; 1734 if ((ca->slot_info = kcalloc(slot_count, sizeof(struct dvb_ca_slot), GFP_KERNEL)) == NULL) { 1735 ret = -ENOMEM; 1736 goto free_ca; 1737 } 1738 init_waitqueue_head(&ca->wait_queue); 1739 ca->open = 0; 1740 ca->wakeup = 0; 1741 ca->next_read_slot = 0; 1742 pubca->private = ca; 1743 1744 /* register the DVB device */ 1745 ret = dvb_register_device(dvb_adapter, &ca->dvbdev, &dvbdev_ca, ca, DVB_DEVICE_CA, 0); 1746 if (ret) 1747 goto free_slot_info; 1748 1749 /* now initialise each slot */ 1750 for (i = 0; i < slot_count; i++) { 1751 memset(&ca->slot_info[i], 0, sizeof(struct dvb_ca_slot)); 1752 ca->slot_info[i].slot_state = DVB_CA_SLOTSTATE_NONE; 1753 atomic_set(&ca->slot_info[i].camchange_count, 0); 1754 ca->slot_info[i].camchange_type = DVB_CA_EN50221_CAMCHANGE_REMOVED; 1755 mutex_init(&ca->slot_info[i].slot_lock); 1756 } 1757 1758 mutex_init(&ca->ioctl_mutex); 1759 1760 if (signal_pending(current)) { 1761 ret = -EINTR; 1762 goto unregister_device; 1763 } 1764 mb(); 1765 1766 /* create a kthread for monitoring this CA device */ 1767 ca->thread = kthread_run(dvb_ca_en50221_thread, ca, "kdvb-ca-%i:%i", 1768 ca->dvbdev->adapter->num, ca->dvbdev->id); 1769 if (IS_ERR(ca->thread)) { 1770 ret = PTR_ERR(ca->thread); 1771 pr_err("dvb_ca_init: failed to start kernel_thread (%d)\n", 1772 ret); 1773 goto unregister_device; 1774 } 1775 return 0; 1776 1777 unregister_device: 1778 dvb_unregister_device(ca->dvbdev); 1779 free_slot_info: 1780 kfree(ca->slot_info); 1781 free_ca: 1782 kfree(ca); 1783 exit: 1784 pubca->private = NULL; 1785 return ret; 1786 } 1787 EXPORT_SYMBOL(dvb_ca_en50221_release); 1788 1789 1790 1791 /** 1792 * Release a DVB CA EN50221 interface device. 1793 * 1794 * @ca_dev: The dvb_device_t instance for the CA device. 1795 * @ca: The associated dvb_ca instance. 1796 */ 1797 void dvb_ca_en50221_release(struct dvb_ca_en50221 *pubca) 1798 { 1799 struct dvb_ca_private *ca = pubca->private; 1800 int i; 1801 1802 dprintk("%s\n", __func__); 1803 1804 /* shutdown the thread if there was one */ 1805 kthread_stop(ca->thread); 1806 1807 for (i = 0; i < ca->slot_count; i++) { 1808 dvb_ca_en50221_slot_shutdown(ca, i); 1809 } 1810 dvb_remove_device(ca->dvbdev); 1811 dvb_ca_private_put(ca); 1812 pubca->private = NULL; 1813 } 1814