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Merge branch 'for-linus' of git://oss.sgi.com/xfs/xfs
[linux/fpc-iii.git] / drivers / media / dvb / dvb-core / dvb_ca_en50221.c
blobef259a0718ac3176befc7e283f67145f5d0d4d0c
1 /*
2 * dvb_ca.c: generic DVB functions for EN50221 CAM interfaces
3 *
4 * Copyright (C) 2004 Andrew de Quincey
5 *
6 * Parts of this file were based on sources as follows:
7 *
8 * Copyright (C) 2003 Ralph Metzler <rjkm@metzlerbros.de>
9 *
10 * based on code:
11 *
12 * Copyright (C) 1999-2002 Ralph Metzler
13 * & Marcus Metzler for convergence integrated media GmbH
14 *
15 * This program is free software; you can redistribute it and/or
16 * modify it under the terms of the GNU General Public License
17 * as published by the Free Software Foundation; either version 2
18 * of the License, or (at your option) any later version.
19 *
20 * This program is distributed in the hope that it will be useful,
21 * but WITHOUT ANY WARRANTY; without even the implied warranty of
22 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
23 * GNU General Public License for more details.
24 *
25 * You should have received a copy of the GNU General Public License
26 * along with this program; if not, write to the Free Software
27 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
28 * Or, point your browser to http://www.gnu.org/copyleft/gpl.html
29 */
30
31 #include <linux/errno.h>
32 #include <linux/slab.h>
33 #include <linux/list.h>
34 #include <linux/module.h>
35 #include <linux/vmalloc.h>
36 #include <linux/delay.h>
37 #include <linux/spinlock.h>
38 #include <linux/sched.h>
39 #include <linux/smp_lock.h>
40 #include <linux/kthread.h>
41
42 #include "dvb_ca_en50221.h"
43 #include "dvb_ringbuffer.h"
44
45 static int dvb_ca_en50221_debug;
46
47 module_param_named(cam_debug, dvb_ca_en50221_debug, int, 0644);
48 MODULE_PARM_DESC(cam_debug, "enable verbose debug messages");
49
50 #define dprintk if (dvb_ca_en50221_debug) printk
51
52 #define INIT_TIMEOUT_SECS 10
53
54 #define HOST_LINK_BUF_SIZE 0x200
55
56 #define RX_BUFFER_SIZE 65535
57
58 #define MAX_RX_PACKETS_PER_ITERATION 10
59
60 #define CTRLIF_DATA 0
61 #define CTRLIF_COMMAND 1
62 #define CTRLIF_STATUS 1
63 #define CTRLIF_SIZE_LOW 2
64 #define CTRLIF_SIZE_HIGH 3
65
66 #define CMDREG_HC 1 /* Host control */
67 #define CMDREG_SW 2 /* Size write */
68 #define CMDREG_SR 4 /* Size read */
69 #define CMDREG_RS 8 /* Reset interface */
70 #define CMDREG_FRIE 0x40 /* Enable FR interrupt */
71 #define CMDREG_DAIE 0x80 /* Enable DA interrupt */
72 #define IRQEN (CMDREG_DAIE)
73
74 #define STATUSREG_RE 1 /* read error */
75 #define STATUSREG_WE 2 /* write error */
76 #define STATUSREG_FR 0x40 /* module free */
77 #define STATUSREG_DA 0x80 /* data available */
78 #define STATUSREG_TXERR (STATUSREG_RE|STATUSREG_WE) /* general transfer error */
79
80
81 #define DVB_CA_SLOTSTATE_NONE 0
82 #define DVB_CA_SLOTSTATE_UNINITIALISED 1
83 #define DVB_CA_SLOTSTATE_RUNNING 2
84 #define DVB_CA_SLOTSTATE_INVALID 3
85 #define DVB_CA_SLOTSTATE_WAITREADY 4
86 #define DVB_CA_SLOTSTATE_VALIDATE 5
87 #define DVB_CA_SLOTSTATE_WAITFR 6
88 #define DVB_CA_SLOTSTATE_LINKINIT 7
89
90
91 /* Information on a CA slot */
92 struct dvb_ca_slot {
93
94 /* current state of the CAM */
95 int slot_state;
96
97 /* mutex used for serializing access to one CI slot */
98 struct mutex slot_lock;
99
100 /* Number of CAMCHANGES that have occurred since last processing */
101 atomic_t camchange_count;
102
103 /* Type of last CAMCHANGE */
104 int camchange_type;
105
106 /* base address of CAM config */
107 u32 config_base;
108
109 /* value to write into Config Control register */
110 u8 config_option;
111
112 /* if 1, the CAM supports DA IRQs */
113 u8 da_irq_supported:1;
114
115 /* size of the buffer to use when talking to the CAM */
116 int link_buf_size;
117
118 /* buffer for incoming packets */
119 struct dvb_ringbuffer rx_buffer;
120
121 /* timer used during various states of the slot */
122 unsigned long timeout;
123 };
124
125 /* Private CA-interface information */
126 struct dvb_ca_private {
127
128 /* pointer back to the public data structure */
129 struct dvb_ca_en50221 *pub;
130
131 /* the DVB device */
132 struct dvb_device *dvbdev;
133
134 /* Flags describing the interface (DVB_CA_FLAG_*) */
135 u32 flags;
136
137 /* number of slots supported by this CA interface */
138 unsigned int slot_count;
139
140 /* information on each slot */
141 struct dvb_ca_slot *slot_info;
142
143 /* wait queues for read() and write() operations */
144 wait_queue_head_t wait_queue;
145
146 /* PID of the monitoring thread */
147 struct task_struct *thread;
148
149 /* Flag indicating if the CA device is open */
150 unsigned int open:1;
151
152 /* Flag indicating the thread should wake up now */
153 unsigned int wakeup:1;
154
155 /* Delay the main thread should use */
156 unsigned long delay;
157
158 /* Slot to start looking for data to read from in the next user-space read operation */
159 int next_read_slot;
160 };
161
162 static void dvb_ca_en50221_thread_wakeup(struct dvb_ca_private *ca);
163 static int dvb_ca_en50221_read_data(struct dvb_ca_private *ca, int slot, u8 * ebuf, int ecount);
164 static int dvb_ca_en50221_write_data(struct dvb_ca_private *ca, int slot, u8 * ebuf, int ecount);
165
166
167 /**
168 * Safely find needle in haystack.
169 *
170 * @param haystack Buffer to look in.
171 * @param hlen Number of bytes in haystack.
172 * @param needle Buffer to find.
173 * @param nlen Number of bytes in needle.
174 * @return Pointer into haystack needle was found at, or NULL if not found.
175 */
176 static char *findstr(char * haystack, int hlen, char * needle, int nlen)
177 {
178 int i;
179
180 if (hlen < nlen)
181 return NULL;
182
183 for (i = 0; i <= hlen - nlen; i++) {
184 if (!strncmp(haystack + i, needle, nlen))
185 return haystack + i;
186 }
187
188 return NULL;
189 }
190
191
192
193 /* ******************************************************************************** */
194 /* EN50221 physical interface functions */
195
196
197 /**
198 * Check CAM status.
199 */
200 static int dvb_ca_en50221_check_camstatus(struct dvb_ca_private *ca, int slot)
201 {
202 int slot_status;
203 int cam_present_now;
204 int cam_changed;
205
206 /* IRQ mode */
207 if (ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE) {
208 return (atomic_read(&ca->slot_info[slot].camchange_count) != 0);
209 }
210
211 /* poll mode */
212 slot_status = ca->pub->poll_slot_status(ca->pub, slot, ca->open);
213
214 cam_present_now = (slot_status & DVB_CA_EN50221_POLL_CAM_PRESENT) ? 1 : 0;
215 cam_changed = (slot_status & DVB_CA_EN50221_POLL_CAM_CHANGED) ? 1 : 0;
216 if (!cam_changed) {
217 int cam_present_old = (ca->slot_info[slot].slot_state != DVB_CA_SLOTSTATE_NONE);
218 cam_changed = (cam_present_now != cam_present_old);
219 }
220
221 if (cam_changed) {
222 if (!cam_present_now) {
223 ca->slot_info[slot].camchange_type = DVB_CA_EN50221_CAMCHANGE_REMOVED;
224 } else {
225 ca->slot_info[slot].camchange_type = DVB_CA_EN50221_CAMCHANGE_INSERTED;
226 }
227 atomic_set(&ca->slot_info[slot].camchange_count, 1);
228 } else {
229 if ((ca->slot_info[slot].slot_state == DVB_CA_SLOTSTATE_WAITREADY) &&
230 (slot_status & DVB_CA_EN50221_POLL_CAM_READY)) {
231 // move to validate state if reset is completed
232 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_VALIDATE;
233 }
234 }
235
236 return cam_changed;
237 }
238
239
240 /**
241 * Wait for flags to become set on the STATUS register on a CAM interface,
242 * checking for errors and timeout.
243 *
244 * @param ca CA instance.
245 * @param slot Slot on interface.
246 * @param waitfor Flags to wait for.
247 * @param timeout_ms Timeout in milliseconds.
248 *
249 * @return 0 on success, nonzero on error.
250 */
251 static int dvb_ca_en50221_wait_if_status(struct dvb_ca_private *ca, int slot,
252 u8 waitfor, int timeout_hz)
253 {
254 unsigned long timeout;
255 unsigned long start;
256
257 dprintk("%s\n", __func__);
258
259 /* loop until timeout elapsed */
260 start = jiffies;
261 timeout = jiffies + timeout_hz;
262 while (1) {
263 /* read the status and check for error */
264 int res = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS);
265 if (res < 0)
266 return -EIO;
267
268 /* if we got the flags, it was successful! */
269 if (res & waitfor) {
270 dprintk("%s succeeded timeout:%lu\n", __func__, jiffies - start);
271 return 0;
272 }
273
274 /* check for timeout */
275 if (time_after(jiffies, timeout)) {
276 break;
277 }
278
279 /* wait for a bit */
280 msleep(1);
281 }
282
283 dprintk("%s failed timeout:%lu\n", __func__, jiffies - start);
284
285 /* if we get here, we've timed out */
286 return -ETIMEDOUT;
287 }
288
289
290 /**
291 * Initialise the link layer connection to a CAM.
292 *
293 * @param ca CA instance.
294 * @param slot Slot id.
295 *
296 * @return 0 on success, nonzero on failure.
297 */
298 static int dvb_ca_en50221_link_init(struct dvb_ca_private *ca, int slot)
299 {
300 int ret;
301 int buf_size;
302 u8 buf[2];
303
304 dprintk("%s\n", __func__);
305
306 /* we'll be determining these during this function */
307 ca->slot_info[slot].da_irq_supported = 0;
308
309 /* set the host link buffer size temporarily. it will be overwritten with the
310 * real negotiated size later. */
311 ca->slot_info[slot].link_buf_size = 2;
312
313 /* read the buffer size from the CAM */
314 if ((ret = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, IRQEN | CMDREG_SR)) != 0)
315 return ret;
316 if ((ret = dvb_ca_en50221_wait_if_status(ca, slot, STATUSREG_DA, HZ / 10)) != 0)
317 return ret;
318 if ((ret = dvb_ca_en50221_read_data(ca, slot, buf, 2)) != 2)
319 return -EIO;
320 if ((ret = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, IRQEN)) != 0)
321 return ret;
322
323 /* store it, and choose the minimum of our buffer and the CAM's buffer size */
324 buf_size = (buf[0] << 8) | buf[1];
325 if (buf_size > HOST_LINK_BUF_SIZE)
326 buf_size = HOST_LINK_BUF_SIZE;
327 ca->slot_info[slot].link_buf_size = buf_size;
328 buf[0] = buf_size >> 8;
329 buf[1] = buf_size & 0xff;
330 dprintk("Chosen link buffer size of %i\n", buf_size);
331
332 /* write the buffer size to the CAM */
333 if ((ret = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, IRQEN | CMDREG_SW)) != 0)
334 return ret;
335 if ((ret = dvb_ca_en50221_wait_if_status(ca, slot, STATUSREG_FR, HZ / 10)) != 0)
336 return ret;
337 if ((ret = dvb_ca_en50221_write_data(ca, slot, buf, 2)) != 2)
338 return -EIO;
339 if ((ret = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, IRQEN)) != 0)
340 return ret;
341
342 /* success */
343 return 0;
344 }
345
346 /**
347 * Read a tuple from attribute memory.
348 *
349 * @param ca CA instance.
350 * @param slot Slot id.
351 * @param address Address to read from. Updated.
352 * @param tupleType Tuple id byte. Updated.
353 * @param tupleLength Tuple length. Updated.
354 * @param tuple Dest buffer for tuple (must be 256 bytes). Updated.
355 *
356 * @return 0 on success, nonzero on error.
357 */
358 static int dvb_ca_en50221_read_tuple(struct dvb_ca_private *ca, int slot,
359 int *address, int *tupleType, int *tupleLength, u8 * tuple)
360 {
361 int i;
362 int _tupleType;
363 int _tupleLength;
364 int _address = *address;
365
366 /* grab the next tuple length and type */
367 if ((_tupleType = ca->pub->read_attribute_mem(ca->pub, slot, _address)) < 0)
368 return _tupleType;
369 if (_tupleType == 0xff) {
370 dprintk("END OF CHAIN TUPLE type:0x%x\n", _tupleType);
371 *address += 2;
372 *tupleType = _tupleType;
373 *tupleLength = 0;
374 return 0;
375 }
376 if ((_tupleLength = ca->pub->read_attribute_mem(ca->pub, slot, _address + 2)) < 0)
377 return _tupleLength;
378 _address += 4;
379
380 dprintk("TUPLE type:0x%x length:%i\n", _tupleType, _tupleLength);
381
382 /* read in the whole tuple */
383 for (i = 0; i < _tupleLength; i++) {
384 tuple[i] = ca->pub->read_attribute_mem(ca->pub, slot, _address + (i * 2));
385 dprintk(" 0x%02x: 0x%02x %c\n",
386 i, tuple[i] & 0xff,
387 ((tuple[i] > 31) && (tuple[i] < 127)) ? tuple[i] : '.');
388 }
389 _address += (_tupleLength * 2);
390
391 // success
392 *tupleType = _tupleType;
393 *tupleLength = _tupleLength;
394 *address = _address;
395 return 0;
396 }
397
398
399 /**
400 * Parse attribute memory of a CAM module, extracting Config register, and checking
401 * it is a DVB CAM module.
402 *
403 * @param ca CA instance.
404 * @param slot Slot id.
405 *
406 * @return 0 on success, <0 on failure.
407 */
408 static int dvb_ca_en50221_parse_attributes(struct dvb_ca_private *ca, int slot)
409 {
410 int address = 0;
411 int tupleLength;
412 int tupleType;
413 u8 tuple[257];
414 char *dvb_str;
415 int rasz;
416 int status;
417 int got_cftableentry = 0;
418 int end_chain = 0;
419 int i;
420 u16 manfid = 0;
421 u16 devid = 0;
422
423
424 // CISTPL_DEVICE_0A
425 if ((status =
426 dvb_ca_en50221_read_tuple(ca, slot, &address, &tupleType, &tupleLength, tuple)) < 0)
427 return status;
428 if (tupleType != 0x1D)
429 return -EINVAL;
430
431
432
433 // CISTPL_DEVICE_0C
434 if ((status =
435 dvb_ca_en50221_read_tuple(ca, slot, &address, &tupleType, &tupleLength, tuple)) < 0)
436 return status;
437 if (tupleType != 0x1C)
438 return -EINVAL;
439
440
441
442 // CISTPL_VERS_1
443 if ((status =
444 dvb_ca_en50221_read_tuple(ca, slot, &address, &tupleType, &tupleLength, tuple)) < 0)
445 return status;
446 if (tupleType != 0x15)
447 return -EINVAL;
448
449
450
451 // CISTPL_MANFID
452 if ((status = dvb_ca_en50221_read_tuple(ca, slot, &address, &tupleType,
453 &tupleLength, tuple)) < 0)
454 return status;
455 if (tupleType != 0x20)
456 return -EINVAL;
457 if (tupleLength != 4)
458 return -EINVAL;
459 manfid = (tuple[1] << 8) | tuple[0];
460 devid = (tuple[3] << 8) | tuple[2];
461
462
463
464 // CISTPL_CONFIG
465 if ((status = dvb_ca_en50221_read_tuple(ca, slot, &address, &tupleType,
466 &tupleLength, tuple)) < 0)
467 return status;
468 if (tupleType != 0x1A)
469 return -EINVAL;
470 if (tupleLength < 3)
471 return -EINVAL;
472
473 /* extract the configbase */
474 rasz = tuple[0] & 3;
475 if (tupleLength < (3 + rasz + 14))
476 return -EINVAL;
477 ca->slot_info[slot].config_base = 0;
478 for (i = 0; i < rasz + 1; i++) {
479 ca->slot_info[slot].config_base |= (tuple[2 + i] << (8 * i));
480 }
481
482 /* check it contains the correct DVB string */
483 dvb_str = findstr((char *)tuple, tupleLength, "DVB_CI_V", 8);
484 if (dvb_str == NULL)
485 return -EINVAL;
486 if (tupleLength < ((dvb_str - (char *) tuple) + 12))
487 return -EINVAL;
488
489 /* is it a version we support? */
490 if (strncmp(dvb_str + 8, "1.00", 4)) {
491 printk("dvb_ca adapter %d: Unsupported DVB CAM module version %c%c%c%c\n",
492 ca->dvbdev->adapter->num, dvb_str[8], dvb_str[9], dvb_str[10], dvb_str[11]);
493 return -EINVAL;
494 }
495
496 /* process the CFTABLE_ENTRY tuples, and any after those */
497 while ((!end_chain) && (address < 0x1000)) {
498 if ((status = dvb_ca_en50221_read_tuple(ca, slot, &address, &tupleType,
499 &tupleLength, tuple)) < 0)
500 return status;
501 switch (tupleType) {
502 case 0x1B: // CISTPL_CFTABLE_ENTRY
503 if (tupleLength < (2 + 11 + 17))
504 break;
505
506 /* if we've already parsed one, just use it */
507 if (got_cftableentry)
508 break;
509
510 /* get the config option */
511 ca->slot_info[slot].config_option = tuple[0] & 0x3f;
512
513 /* OK, check it contains the correct strings */
514 if ((findstr((char *)tuple, tupleLength, "DVB_HOST", 8) == NULL) ||
515 (findstr((char *)tuple, tupleLength, "DVB_CI_MODULE", 13) == NULL))
516 break;
517
518 got_cftableentry = 1;
519 break;
520
521 case 0x14: // CISTPL_NO_LINK
522 break;
523
524 case 0xFF: // CISTPL_END
525 end_chain = 1;
526 break;
527
528 default: /* Unknown tuple type - just skip this tuple and move to the next one */
529 dprintk("dvb_ca: Skipping unknown tuple type:0x%x length:0x%x\n", tupleType,
530 tupleLength);
531 break;
532 }
533 }
534
535 if ((address > 0x1000) || (!got_cftableentry))
536 return -EINVAL;
537
538 dprintk("Valid DVB CAM detected MANID:%x DEVID:%x CONFIGBASE:0x%x CONFIGOPTION:0x%x\n",
539 manfid, devid, ca->slot_info[slot].config_base, ca->slot_info[slot].config_option);
540
541 // success!
542 return 0;
543 }
544
545
546 /**
547 * Set CAM's configoption correctly.
548 *
549 * @param ca CA instance.
550 * @param slot Slot containing the CAM.
551 */
552 static int dvb_ca_en50221_set_configoption(struct dvb_ca_private *ca, int slot)
553 {
554 int configoption;
555
556 dprintk("%s\n", __func__);
557
558 /* set the config option */
559 ca->pub->write_attribute_mem(ca->pub, slot,
560 ca->slot_info[slot].config_base,
561 ca->slot_info[slot].config_option);
562
563 /* check it */
564 configoption = ca->pub->read_attribute_mem(ca->pub, slot, ca->slot_info[slot].config_base);
565 dprintk("Set configoption 0x%x, read configoption 0x%x\n",
566 ca->slot_info[slot].config_option, configoption & 0x3f);
567
568 /* fine! */
569 return 0;
570
571 }
572
573
574 /**
575 * This function talks to an EN50221 CAM control interface. It reads a buffer of
576 * data from the CAM. The data can either be stored in a supplied buffer, or
577 * automatically be added to the slot's rx_buffer.
578 *
579 * @param ca CA instance.
580 * @param slot Slot to read from.
581 * @param ebuf If non-NULL, the data will be written to this buffer. If NULL,
582 * the data will be added into the buffering system as a normal fragment.
583 * @param ecount Size of ebuf. Ignored if ebuf is NULL.
584 *
585 * @return Number of bytes read, or < 0 on error
586 */
587 static int dvb_ca_en50221_read_data(struct dvb_ca_private *ca, int slot, u8 * ebuf, int ecount)
588 {
589 int bytes_read;
590 int status;
591 u8 buf[HOST_LINK_BUF_SIZE];
592 int i;
593
594 dprintk("%s\n", __func__);
595
596 /* check if we have space for a link buf in the rx_buffer */
597 if (ebuf == NULL) {
598 int buf_free;
599
600 if (ca->slot_info[slot].rx_buffer.data == NULL) {
601 status = -EIO;
602 goto exit;
603 }
604 buf_free = dvb_ringbuffer_free(&ca->slot_info[slot].rx_buffer);
605
606 if (buf_free < (ca->slot_info[slot].link_buf_size + DVB_RINGBUFFER_PKTHDRSIZE)) {
607 status = -EAGAIN;
608 goto exit;
609 }
610 }
611
612 /* check if there is data available */
613 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS)) < 0)
614 goto exit;
615 if (!(status & STATUSREG_DA)) {
616 /* no data */
617 status = 0;
618 goto exit;
619 }
620
621 /* read the amount of data */
622 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_SIZE_HIGH)) < 0)
623 goto exit;
624 bytes_read = status << 8;
625 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_SIZE_LOW)) < 0)
626 goto exit;
627 bytes_read |= status;
628
629 /* check it will fit */
630 if (ebuf == NULL) {
631 if (bytes_read > ca->slot_info[slot].link_buf_size) {
632 printk("dvb_ca adapter %d: CAM tried to send a buffer larger than the link buffer size (%i > %i)!\n",
633 ca->dvbdev->adapter->num, bytes_read, ca->slot_info[slot].link_buf_size);
634 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_LINKINIT;
635 status = -EIO;
636 goto exit;
637 }
638 if (bytes_read < 2) {
639 printk("dvb_ca adapter %d: CAM sent a buffer that was less than 2 bytes!\n",
640 ca->dvbdev->adapter->num);
641 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_LINKINIT;
642 status = -EIO;
643 goto exit;
644 }
645 } else {
646 if (bytes_read > ecount) {
647 printk("dvb_ca adapter %d: CAM tried to send a buffer larger than the ecount size!\n",
648 ca->dvbdev->adapter->num);
649 status = -EIO;
650 goto exit;
651 }
652 }
653
654 /* fill the buffer */
655 for (i = 0; i < bytes_read; i++) {
656 /* read byte and check */
657 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_DATA)) < 0)
658 goto exit;
659
660 /* OK, store it in the buffer */
661 buf[i] = status;
662 }
663
664 /* check for read error (RE should now be 0) */
665 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS)) < 0)
666 goto exit;
667 if (status & STATUSREG_RE) {
668 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_LINKINIT;
669 status = -EIO;
670 goto exit;
671 }
672
673 /* OK, add it to the receive buffer, or copy into external buffer if supplied */
674 if (ebuf == NULL) {
675 if (ca->slot_info[slot].rx_buffer.data == NULL) {
676 status = -EIO;
677 goto exit;
678 }
679 dvb_ringbuffer_pkt_write(&ca->slot_info[slot].rx_buffer, buf, bytes_read);
680 } else {
681 memcpy(ebuf, buf, bytes_read);
682 }
683
684 dprintk("Received CA packet for slot %i connection id 0x%x last_frag:%i size:0x%x\n", slot,
685 buf[0], (buf[1] & 0x80) == 0, bytes_read);
686
687 /* wake up readers when a last_fragment is received */
688 if ((buf[1] & 0x80) == 0x00) {
689 wake_up_interruptible(&ca->wait_queue);
690 }
691 status = bytes_read;
692
693 exit:
694 return status;
695 }
696
697
698 /**
699 * This function talks to an EN50221 CAM control interface. It writes a buffer of data
700 * to a CAM.
701 *
702 * @param ca CA instance.
703 * @param slot Slot to write to.
704 * @param ebuf The data in this buffer is treated as a complete link-level packet to
705 * be written.
706 * @param count Size of ebuf.
707 *
708 * @return Number of bytes written, or < 0 on error.
709 */
710 static int dvb_ca_en50221_write_data(struct dvb_ca_private *ca, int slot, u8 * buf, int bytes_write)
711 {
712 int status;
713 int i;
714
715 dprintk("%s\n", __func__);
716
717
718 /* sanity check */
719 if (bytes_write > ca->slot_info[slot].link_buf_size)
720 return -EINVAL;
721
722 /* it is possible we are dealing with a single buffer implementation,
723 thus if there is data available for read or if there is even a read
724 already in progress, we do nothing but awake the kernel thread to
725 process the data if necessary. */
726 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS)) < 0)
727 goto exitnowrite;
728 if (status & (STATUSREG_DA | STATUSREG_RE)) {
729 if (status & STATUSREG_DA)
730 dvb_ca_en50221_thread_wakeup(ca);
731
732 status = -EAGAIN;
733 goto exitnowrite;
734 }
735
736 /* OK, set HC bit */
737 if ((status = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND,
738 IRQEN | CMDREG_HC)) != 0)
739 goto exit;
740
741 /* check if interface is still free */
742 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS)) < 0)
743 goto exit;
744 if (!(status & STATUSREG_FR)) {
745 /* it wasn't free => try again later */
746 status = -EAGAIN;
747 goto exit;
748 }
749
750 /* send the amount of data */
751 if ((status = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_SIZE_HIGH, bytes_write >> 8)) != 0)
752 goto exit;
753 if ((status = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_SIZE_LOW,
754 bytes_write & 0xff)) != 0)
755 goto exit;
756
757 /* send the buffer */
758 for (i = 0; i < bytes_write; i++) {
759 if ((status = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_DATA, buf[i])) != 0)
760 goto exit;
761 }
762
763 /* check for write error (WE should now be 0) */
764 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS)) < 0)
765 goto exit;
766 if (status & STATUSREG_WE) {
767 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_LINKINIT;
768 status = -EIO;
769 goto exit;
770 }
771 status = bytes_write;
772
773 dprintk("Wrote CA packet for slot %i, connection id 0x%x last_frag:%i size:0x%x\n", slot,
774 buf[0], (buf[1] & 0x80) == 0, bytes_write);
775
776 exit:
777 ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, IRQEN);
778
779 exitnowrite:
780 return status;
781 }
782 EXPORT_SYMBOL(dvb_ca_en50221_camchange_irq);
783
784
785
786 /* ******************************************************************************** */
787 /* EN50221 higher level functions */
788
789
790 /**
791 * A CAM has been removed => shut it down.
792 *
793 * @param ca CA instance.
794 * @param slot Slot to shut down.
795 */
796 static int dvb_ca_en50221_slot_shutdown(struct dvb_ca_private *ca, int slot)
797 {
798 dprintk("%s\n", __func__);
799
800 ca->pub->slot_shutdown(ca->pub, slot);
801 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_NONE;
802
803 /* need to wake up all processes to check if they're now
804 trying to write to a defunct CAM */
805 wake_up_interruptible(&ca->wait_queue);
806
807 dprintk("Slot %i shutdown\n", slot);
808
809 /* success */
810 return 0;
811 }
812 EXPORT_SYMBOL(dvb_ca_en50221_camready_irq);
813
814
815 /**
816 * A CAMCHANGE IRQ has occurred.
817 *
818 * @param ca CA instance.
819 * @param slot Slot concerned.
820 * @param change_type One of the DVB_CA_CAMCHANGE_* values.
821 */
822 void dvb_ca_en50221_camchange_irq(struct dvb_ca_en50221 *pubca, int slot, int change_type)
823 {
824 struct dvb_ca_private *ca = pubca->private;
825
826 dprintk("CAMCHANGE IRQ slot:%i change_type:%i\n", slot, change_type);
827
828 switch (change_type) {
829 case DVB_CA_EN50221_CAMCHANGE_REMOVED:
830 case DVB_CA_EN50221_CAMCHANGE_INSERTED:
831 break;
832
833 default:
834 return;
835 }
836
837 ca->slot_info[slot].camchange_type = change_type;
838 atomic_inc(&ca->slot_info[slot].camchange_count);
839 dvb_ca_en50221_thread_wakeup(ca);
840 }
841 EXPORT_SYMBOL(dvb_ca_en50221_frda_irq);
842
843
844 /**
845 * A CAMREADY IRQ has occurred.
846 *
847 * @param ca CA instance.
848 * @param slot Slot concerned.
849 */
850 void dvb_ca_en50221_camready_irq(struct dvb_ca_en50221 *pubca, int slot)
851 {
852 struct dvb_ca_private *ca = pubca->private;
853
854 dprintk("CAMREADY IRQ slot:%i\n", slot);
855
856 if (ca->slot_info[slot].slot_state == DVB_CA_SLOTSTATE_WAITREADY) {
857 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_VALIDATE;
858 dvb_ca_en50221_thread_wakeup(ca);
859 }
860 }
861
862
863 /**
864 * An FR or DA IRQ has occurred.
865 *
866 * @param ca CA instance.
867 * @param slot Slot concerned.
868 */
869 void dvb_ca_en50221_frda_irq(struct dvb_ca_en50221 *pubca, int slot)
870 {
871 struct dvb_ca_private *ca = pubca->private;
872 int flags;
873
874 dprintk("FR/DA IRQ slot:%i\n", slot);
875
876 switch (ca->slot_info[slot].slot_state) {
877 case DVB_CA_SLOTSTATE_LINKINIT:
878 flags = ca->pub->read_cam_control(pubca, slot, CTRLIF_STATUS);
879 if (flags & STATUSREG_DA) {
880 dprintk("CAM supports DA IRQ\n");
881 ca->slot_info[slot].da_irq_supported = 1;
882 }
883 break;
884
885 case DVB_CA_SLOTSTATE_RUNNING:
886 if (ca->open)
887 dvb_ca_en50221_thread_wakeup(ca);
888 break;
889 }
890 }
891
892
893
894 /* ******************************************************************************** */
895 /* EN50221 thread functions */
896
897 /**
898 * Wake up the DVB CA thread
899 *
900 * @param ca CA instance.
901 */
902 static void dvb_ca_en50221_thread_wakeup(struct dvb_ca_private *ca)
903 {
904
905 dprintk("%s\n", __func__);
906
907 ca->wakeup = 1;
908 mb();
909 wake_up_process(ca->thread);
910 }
911
912 /**
913 * Update the delay used by the thread.
914 *
915 * @param ca CA instance.
916 */
917 static void dvb_ca_en50221_thread_update_delay(struct dvb_ca_private *ca)
918 {
919 int delay;
920 int curdelay = 100000000;
921 int slot;
922
923 /* Beware of too high polling frequency, because one polling
924 * call might take several hundred milliseconds until timeout!
925 */
926 for (slot = 0; slot < ca->slot_count; slot++) {
927 switch (ca->slot_info[slot].slot_state) {
928 default:
929 case DVB_CA_SLOTSTATE_NONE:
930 delay = HZ * 60; /* 60s */
931 if (!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE))
932 delay = HZ * 5; /* 5s */
933 break;
934 case DVB_CA_SLOTSTATE_INVALID:
935 delay = HZ * 60; /* 60s */
936 if (!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE))
937 delay = HZ / 10; /* 100ms */
938 break;
939
940 case DVB_CA_SLOTSTATE_UNINITIALISED:
941 case DVB_CA_SLOTSTATE_WAITREADY:
942 case DVB_CA_SLOTSTATE_VALIDATE:
943 case DVB_CA_SLOTSTATE_WAITFR:
944 case DVB_CA_SLOTSTATE_LINKINIT:
945 delay = HZ / 10; /* 100ms */
946 break;
947
948 case DVB_CA_SLOTSTATE_RUNNING:
949 delay = HZ * 60; /* 60s */
950 if (!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE))
951 delay = HZ / 10; /* 100ms */
952 if (ca->open) {
953 if ((!ca->slot_info[slot].da_irq_supported) ||
954 (!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_DA)))
955 delay = HZ / 10; /* 100ms */
956 }
957 break;
958 }
959
960 if (delay < curdelay)
961 curdelay = delay;
962 }
963
964 ca->delay = curdelay;
965 }
966
967
968
969 /**
970 * Kernel thread which monitors CA slots for CAM changes, and performs data transfers.
971 */
972 static int dvb_ca_en50221_thread(void *data)
973 {
974 struct dvb_ca_private *ca = data;
975 int slot;
976 int flags;
977 int status;
978 int pktcount;
979 void *rxbuf;
980
981 dprintk("%s\n", __func__);
982
983 /* choose the correct initial delay */
984 dvb_ca_en50221_thread_update_delay(ca);
985
986 /* main loop */
987 while (!kthread_should_stop()) {
988 /* sleep for a bit */
989 if (!ca->wakeup) {
990 set_current_state(TASK_INTERRUPTIBLE);
991 schedule_timeout(ca->delay);
992 if (kthread_should_stop())
993 return 0;
994 }
995 ca->wakeup = 0;
996
997 /* go through all the slots processing them */
998 for (slot = 0; slot < ca->slot_count; slot++) {
999
1000 mutex_lock(&ca->slot_info[slot].slot_lock);
1001
1002 // check the cam status + deal with CAMCHANGEs
1003 while (dvb_ca_en50221_check_camstatus(ca, slot)) {
1004 /* clear down an old CI slot if necessary */
1005 if (ca->slot_info[slot].slot_state != DVB_CA_SLOTSTATE_NONE)
1006 dvb_ca_en50221_slot_shutdown(ca, slot);
1007
1008 /* if a CAM is NOW present, initialise it */
1009 if (ca->slot_info[slot].camchange_type == DVB_CA_EN50221_CAMCHANGE_INSERTED) {
1010 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_UNINITIALISED;
1011 }
1012
1013 /* we've handled one CAMCHANGE */
1014 dvb_ca_en50221_thread_update_delay(ca);
1015 atomic_dec(&ca->slot_info[slot].camchange_count);
1016 }
1017
1018 // CAM state machine
1019 switch (ca->slot_info[slot].slot_state) {
1020 case DVB_CA_SLOTSTATE_NONE:
1021 case DVB_CA_SLOTSTATE_INVALID:
1022 // no action needed
1023 break;
1024
1025 case DVB_CA_SLOTSTATE_UNINITIALISED:
1026 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_WAITREADY;
1027 ca->pub->slot_reset(ca->pub, slot);
1028 ca->slot_info[slot].timeout = jiffies + (INIT_TIMEOUT_SECS * HZ);
1029 break;
1030
1031 case DVB_CA_SLOTSTATE_WAITREADY:
1032 if (time_after(jiffies, ca->slot_info[slot].timeout)) {
1033 printk("dvb_ca adaptor %d: PC card did not respond :(\n",
1034 ca->dvbdev->adapter->num);
1035 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID;
1036 dvb_ca_en50221_thread_update_delay(ca);
1037 break;
1038 }
1039 // no other action needed; will automatically change state when ready
1040 break;
1041
1042 case DVB_CA_SLOTSTATE_VALIDATE:
1043 if (dvb_ca_en50221_parse_attributes(ca, slot) != 0) {
1044 /* we need this extra check for annoying interfaces like the budget-av */
1045 if ((!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE)) &&
1046 (ca->pub->poll_slot_status)) {
1047 status = ca->pub->poll_slot_status(ca->pub, slot, 0);
1048 if (!(status & DVB_CA_EN50221_POLL_CAM_PRESENT)) {
1049 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_NONE;
1050 dvb_ca_en50221_thread_update_delay(ca);
1051 break;
1052 }
1053 }
1054
1055 printk("dvb_ca adapter %d: Invalid PC card inserted :(\n",
1056 ca->dvbdev->adapter->num);
1057 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID;
1058 dvb_ca_en50221_thread_update_delay(ca);
1059 break;
1060 }
1061 if (dvb_ca_en50221_set_configoption(ca, slot) != 0) {
1062 printk("dvb_ca adapter %d: Unable to initialise CAM :(\n",
1063 ca->dvbdev->adapter->num);
1064 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID;
1065 dvb_ca_en50221_thread_update_delay(ca);
1066 break;
1067 }
1068 if (ca->pub->write_cam_control(ca->pub, slot,
1069 CTRLIF_COMMAND, CMDREG_RS) != 0) {
1070 printk("dvb_ca adapter %d: Unable to reset CAM IF\n",
1071 ca->dvbdev->adapter->num);
1072 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID;
1073 dvb_ca_en50221_thread_update_delay(ca);
1074 break;
1075 }
1076 dprintk("DVB CAM validated successfully\n");
1077
1078 ca->slot_info[slot].timeout = jiffies + (INIT_TIMEOUT_SECS * HZ);
1079 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_WAITFR;
1080 ca->wakeup = 1;
1081 break;
1082
1083 case DVB_CA_SLOTSTATE_WAITFR:
1084 if (time_after(jiffies, ca->slot_info[slot].timeout)) {
1085 printk("dvb_ca adapter %d: DVB CAM did not respond :(\n",
1086 ca->dvbdev->adapter->num);
1087 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID;
1088 dvb_ca_en50221_thread_update_delay(ca);
1089 break;
1090 }
1091
1092 flags = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS);
1093 if (flags & STATUSREG_FR) {
1094 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_LINKINIT;
1095 ca->wakeup = 1;
1096 }
1097 break;
1098
1099 case DVB_CA_SLOTSTATE_LINKINIT:
1100 if (dvb_ca_en50221_link_init(ca, slot) != 0) {
1101 /* we need this extra check for annoying interfaces like the budget-av */
1102 if ((!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE)) &&
1103 (ca->pub->poll_slot_status)) {
1104 status = ca->pub->poll_slot_status(ca->pub, slot, 0);
1105 if (!(status & DVB_CA_EN50221_POLL_CAM_PRESENT)) {
1106 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_NONE;
1107 dvb_ca_en50221_thread_update_delay(ca);
1108 break;
1109 }
1110 }
1111
1112 printk("dvb_ca adapter %d: DVB CAM link initialisation failed :(\n", 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
1118 if (ca->slot_info[slot].rx_buffer.data == NULL) {
1119 rxbuf = vmalloc(RX_BUFFER_SIZE);
1120 if (rxbuf == NULL) {
1121 printk("dvb_ca adapter %d: Unable to allocate CAM rx buffer :(\n", ca->dvbdev->adapter->num);
1122 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID;
1123 dvb_ca_en50221_thread_update_delay(ca);
1124 break;
1125 }
1126 dvb_ringbuffer_init(&ca->slot_info[slot].rx_buffer, rxbuf, RX_BUFFER_SIZE);
1127 }
1128
1129 ca->pub->slot_ts_enable(ca->pub, slot);
1130 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_RUNNING;
1131 dvb_ca_en50221_thread_update_delay(ca);
1132 printk("dvb_ca adapter %d: DVB CAM detected and initialised successfully\n", ca->dvbdev->adapter->num);
1133 break;
1134
1135 case DVB_CA_SLOTSTATE_RUNNING:
1136 if (!ca->open)
1137 break;
1138
1139 // poll slots for data
1140 pktcount = 0;
1141 while ((status = dvb_ca_en50221_read_data(ca, slot, NULL, 0)) > 0) {
1142 if (!ca->open)
1143 break;
1144
1145 /* if a CAMCHANGE occurred at some point, do not do any more processing of this slot */
1146 if (dvb_ca_en50221_check_camstatus(ca, slot)) {
1147 // we dont want to sleep on the next iteration so we can handle the cam change
1148 ca->wakeup = 1;
1149 break;
1150 }
1151
1152 /* check if we've hit our limit this time */
1153 if (++pktcount >= MAX_RX_PACKETS_PER_ITERATION) {
1154 // dont sleep; there is likely to be more data to read
1155 ca->wakeup = 1;
1156 break;
1157 }
1158 }
1159 break;
1160 }
1161
1162 mutex_unlock(&ca->slot_info[slot].slot_lock);
1163 }
1164 }
1165
1166 return 0;
1167 }
1168
1169
1170
1171 /* ******************************************************************************** */
1172 /* EN50221 IO interface functions */
1173
1174 /**
1175 * Real ioctl implementation.
1176 * NOTE: CA_SEND_MSG/CA_GET_MSG ioctls have userspace buffers passed to them.
1177 *
1178 * @param inode Inode concerned.
1179 * @param file File concerned.
1180 * @param cmd IOCTL command.
1181 * @param arg Associated argument.
1182 *
1183 * @return 0 on success, <0 on error.
1184 */
1185 static int dvb_ca_en50221_io_do_ioctl(struct file *file,
1186 unsigned int cmd, void *parg)
1187 {
1188 struct dvb_device *dvbdev = file->private_data;
1189 struct dvb_ca_private *ca = dvbdev->priv;
1190 int err = 0;
1191 int slot;
1192
1193 dprintk("%s\n", __func__);
1194
1195 switch (cmd) {
1196 case CA_RESET:
1197 for (slot = 0; slot < ca->slot_count; slot++) {
1198 mutex_lock(&ca->slot_info[slot].slot_lock);
1199 if (ca->slot_info[slot].slot_state != DVB_CA_SLOTSTATE_NONE) {
1200 dvb_ca_en50221_slot_shutdown(ca, slot);
1201 if (ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE)
1202 dvb_ca_en50221_camchange_irq(ca->pub,
1203 slot,
1204 DVB_CA_EN50221_CAMCHANGE_INSERTED);
1205 }
1206 mutex_unlock(&ca->slot_info[slot].slot_lock);
1207 }
1208 ca->next_read_slot = 0;
1209 dvb_ca_en50221_thread_wakeup(ca);
1210 break;
1211
1212 case CA_GET_CAP: {
1213 struct ca_caps *caps = parg;
1214
1215 caps->slot_num = ca->slot_count;
1216 caps->slot_type = CA_CI_LINK;
1217 caps->descr_num = 0;
1218 caps->descr_type = 0;
1219 break;
1220 }
1221
1222 case CA_GET_SLOT_INFO: {
1223 struct ca_slot_info *info = parg;
1224
1225 if ((info->num > ca->slot_count) || (info->num < 0))
1226 return -EINVAL;
1227
1228 info->type = CA_CI_LINK;
1229 info->flags = 0;
1230 if ((ca->slot_info[info->num].slot_state != DVB_CA_SLOTSTATE_NONE)
1231 && (ca->slot_info[info->num].slot_state != DVB_CA_SLOTSTATE_INVALID)) {
1232 info->flags = CA_CI_MODULE_PRESENT;
1233 }
1234 if (ca->slot_info[info->num].slot_state == DVB_CA_SLOTSTATE_RUNNING) {
1235 info->flags |= CA_CI_MODULE_READY;
1236 }
1237 break;
1238 }
1239
1240 default:
1241 err = -EINVAL;
1242 break;
1243 }
1244
1245 return err;
1246 }
1247
1248
1249 /**
1250 * Wrapper for ioctl implementation.
1251 *
1252 * @param inode Inode concerned.
1253 * @param file File concerned.
1254 * @param cmd IOCTL command.
1255 * @param arg Associated argument.
1256 *
1257 * @return 0 on success, <0 on error.
1258 */
1259 static long dvb_ca_en50221_io_ioctl(struct file *file,
1260 unsigned int cmd, unsigned long arg)
1261 {
1262 int ret;
1263
1264 lock_kernel();
1265 ret = dvb_usercopy(file, cmd, arg, dvb_ca_en50221_io_do_ioctl);
1266 unlock_kernel();
1267
1268 return ret;
1269 }
1270
1271
1272 /**
1273 * Implementation of write() syscall.
1274 *
1275 * @param file File structure.
1276 * @param buf Source buffer.
1277 * @param count Size of source buffer.
1278 * @param ppos Position in file (ignored).
1279 *
1280 * @return Number of bytes read, or <0 on error.
1281 */
1282 static ssize_t dvb_ca_en50221_io_write(struct file *file,
1283 const char __user * buf, size_t count, loff_t * ppos)
1284 {
1285 struct dvb_device *dvbdev = file->private_data;
1286 struct dvb_ca_private *ca = dvbdev->priv;
1287 u8 slot, connection_id;
1288 int status;
1289 u8 fragbuf[HOST_LINK_BUF_SIZE];
1290 int fragpos = 0;
1291 int fraglen;
1292 unsigned long timeout;
1293 int written;
1294
1295 dprintk("%s\n", __func__);
1296
1297 /* Incoming packet has a 2 byte header. hdr[0] = slot_id, hdr[1] = connection_id */
1298 if (count < 2)
1299 return -EINVAL;
1300
1301 /* extract slot & connection id */
1302 if (copy_from_user(&slot, buf, 1))
1303 return -EFAULT;
1304 if (copy_from_user(&connection_id, buf + 1, 1))
1305 return -EFAULT;
1306 buf += 2;
1307 count -= 2;
1308
1309 /* check if the slot is actually running */
1310 if (ca->slot_info[slot].slot_state != DVB_CA_SLOTSTATE_RUNNING)
1311 return -EINVAL;
1312
1313 /* fragment the packets & store in the buffer */
1314 while (fragpos < count) {
1315 fraglen = ca->slot_info[slot].link_buf_size - 2;
1316 if ((count - fragpos) < fraglen)
1317 fraglen = count - fragpos;
1318
1319 fragbuf[0] = connection_id;
1320 fragbuf[1] = ((fragpos + fraglen) < count) ? 0x80 : 0x00;
1321 if ((status = copy_from_user(fragbuf + 2, buf + fragpos, fraglen)) != 0)
1322 goto exit;
1323
1324 timeout = jiffies + HZ / 2;
1325 written = 0;
1326 while (!time_after(jiffies, timeout)) {
1327 /* check the CAM hasn't been removed/reset in the meantime */
1328 if (ca->slot_info[slot].slot_state != DVB_CA_SLOTSTATE_RUNNING) {
1329 status = -EIO;
1330 goto exit;
1331 }
1332
1333 mutex_lock(&ca->slot_info[slot].slot_lock);
1334 status = dvb_ca_en50221_write_data(ca, slot, fragbuf, fraglen + 2);
1335 mutex_unlock(&ca->slot_info[slot].slot_lock);
1336 if (status == (fraglen + 2)) {
1337 written = 1;
1338 break;
1339 }
1340 if (status != -EAGAIN)
1341 goto exit;
1342
1343 msleep(1);
1344 }
1345 if (!written) {
1346 status = -EIO;
1347 goto exit;
1348 }
1349
1350 fragpos += fraglen;
1351 }
1352 status = count + 2;
1353
1354 exit:
1355 return status;
1356 }
1357
1358
1359 /**
1360 * Condition for waking up in dvb_ca_en50221_io_read_condition
1361 */
1362 static int dvb_ca_en50221_io_read_condition(struct dvb_ca_private *ca,
1363 int *result, int *_slot)
1364 {
1365 int slot;
1366 int slot_count = 0;
1367 int idx;
1368 size_t fraglen;
1369 int connection_id = -1;
1370 int found = 0;
1371 u8 hdr[2];
1372
1373 slot = ca->next_read_slot;
1374 while ((slot_count < ca->slot_count) && (!found)) {
1375 if (ca->slot_info[slot].slot_state != DVB_CA_SLOTSTATE_RUNNING)
1376 goto nextslot;
1377
1378 if (ca->slot_info[slot].rx_buffer.data == NULL) {
1379 return 0;
1380 }
1381
1382 idx = dvb_ringbuffer_pkt_next(&ca->slot_info[slot].rx_buffer, -1, &fraglen);
1383 while (idx != -1) {
1384 dvb_ringbuffer_pkt_read(&ca->slot_info[slot].rx_buffer, idx, 0, hdr, 2);
1385 if (connection_id == -1)
1386 connection_id = hdr[0];
1387 if ((hdr[0] == connection_id) && ((hdr[1] & 0x80) == 0)) {
1388 *_slot = slot;
1389 found = 1;
1390 break;
1391 }
1392
1393 idx = dvb_ringbuffer_pkt_next(&ca->slot_info[slot].rx_buffer, idx, &fraglen);
1394 }
1395
1396 nextslot:
1397 slot = (slot + 1) % ca->slot_count;
1398 slot_count++;
1399 }
1400
1401 ca->next_read_slot = slot;
1402 return found;
1403 }
1404
1405
1406 /**
1407 * Implementation of read() syscall.
1408 *
1409 * @param file File structure.
1410 * @param buf Destination buffer.
1411 * @param count Size of destination buffer.
1412 * @param ppos Position in file (ignored).
1413 *
1414 * @return Number of bytes read, or <0 on error.
1415 */
1416 static ssize_t dvb_ca_en50221_io_read(struct file *file, char __user * buf,
1417 size_t count, loff_t * ppos)
1418 {
1419 struct dvb_device *dvbdev = file->private_data;
1420 struct dvb_ca_private *ca = dvbdev->priv;
1421 int status;
1422 int result = 0;
1423 u8 hdr[2];
1424 int slot;
1425 int connection_id = -1;
1426 size_t idx, idx2;
1427 int last_fragment = 0;
1428 size_t fraglen;
1429 int pktlen;
1430 int dispose = 0;
1431
1432 dprintk("%s\n", __func__);
1433
1434 /* Outgoing packet has a 2 byte header. hdr[0] = slot_id, hdr[1] = connection_id */
1435 if (count < 2)
1436 return -EINVAL;
1437
1438 /* wait for some data */
1439 if ((status = dvb_ca_en50221_io_read_condition(ca, &result, &slot)) == 0) {
1440
1441 /* if we're in nonblocking mode, exit immediately */
1442 if (file->f_flags & O_NONBLOCK)
1443 return -EWOULDBLOCK;
1444
1445 /* wait for some data */
1446 status = wait_event_interruptible(ca->wait_queue,
1447 dvb_ca_en50221_io_read_condition
1448 (ca, &result, &slot));
1449 }
1450 if ((status < 0) || (result < 0)) {
1451 if (result)
1452 return result;
1453 return status;
1454 }
1455
1456 idx = dvb_ringbuffer_pkt_next(&ca->slot_info[slot].rx_buffer, -1, &fraglen);
1457 pktlen = 2;
1458 do {
1459 if (idx == -1) {
1460 printk("dvb_ca adapter %d: BUG: read packet ended before last_fragment encountered\n", ca->dvbdev->adapter->num);
1461 status = -EIO;
1462 goto exit;
1463 }
1464
1465 dvb_ringbuffer_pkt_read(&ca->slot_info[slot].rx_buffer, idx, 0, hdr, 2);
1466 if (connection_id == -1)
1467 connection_id = hdr[0];
1468 if (hdr[0] == connection_id) {
1469 if (pktlen < count) {
1470 if ((pktlen + fraglen - 2) > count) {
1471 fraglen = count - pktlen;
1472 } else {
1473 fraglen -= 2;
1474 }
1475
1476 if ((status = dvb_ringbuffer_pkt_read_user(&ca->slot_info[slot].rx_buffer, idx, 2,
1477 buf + pktlen, fraglen)) < 0) {
1478 goto exit;
1479 }
1480 pktlen += fraglen;
1481 }
1482
1483 if ((hdr[1] & 0x80) == 0)
1484 last_fragment = 1;
1485 dispose = 1;
1486 }
1487
1488 idx2 = dvb_ringbuffer_pkt_next(&ca->slot_info[slot].rx_buffer, idx, &fraglen);
1489 if (dispose)
1490 dvb_ringbuffer_pkt_dispose(&ca->slot_info[slot].rx_buffer, idx);
1491 idx = idx2;
1492 dispose = 0;
1493 } while (!last_fragment);
1494
1495 hdr[0] = slot;
1496 hdr[1] = connection_id;
1497 if ((status = copy_to_user(buf, hdr, 2)) != 0)
1498 goto exit;
1499 status = pktlen;
1500
1501 exit:
1502 return status;
1503 }
1504
1505
1506 /**
1507 * Implementation of file open syscall.
1508 *
1509 * @param inode Inode concerned.
1510 * @param file File concerned.
1511 *
1512 * @return 0 on success, <0 on failure.
1513 */
1514 static int dvb_ca_en50221_io_open(struct inode *inode, struct file *file)
1515 {
1516 struct dvb_device *dvbdev = file->private_data;
1517 struct dvb_ca_private *ca = dvbdev->priv;
1518 int err;
1519 int i;
1520
1521 dprintk("%s\n", __func__);
1522
1523 if (!try_module_get(ca->pub->owner))
1524 return -EIO;
1525
1526 err = dvb_generic_open(inode, file);
1527 if (err < 0) {
1528 module_put(ca->pub->owner);
1529 return err;
1530 }
1531
1532 for (i = 0; i < ca->slot_count; i++) {
1533
1534 if (ca->slot_info[i].slot_state == DVB_CA_SLOTSTATE_RUNNING) {
1535 if (ca->slot_info[i].rx_buffer.data != NULL) {
1536 /* it is safe to call this here without locks because
1537 * ca->open == 0. Data is not read in this case */
1538 dvb_ringbuffer_flush(&ca->slot_info[i].rx_buffer);
1539 }
1540 }
1541 }
1542
1543 ca->open = 1;
1544 dvb_ca_en50221_thread_update_delay(ca);
1545 dvb_ca_en50221_thread_wakeup(ca);
1546
1547 return 0;
1548 }
1549
1550
1551 /**
1552 * Implementation of file close syscall.
1553 *
1554 * @param inode Inode concerned.
1555 * @param file File concerned.
1556 *
1557 * @return 0 on success, <0 on failure.
1558 */
1559 static int dvb_ca_en50221_io_release(struct inode *inode, struct file *file)
1560 {
1561 struct dvb_device *dvbdev = file->private_data;
1562 struct dvb_ca_private *ca = dvbdev->priv;
1563 int err;
1564
1565 dprintk("%s\n", __func__);
1566
1567 /* mark the CA device as closed */
1568 ca->open = 0;
1569 dvb_ca_en50221_thread_update_delay(ca);
1570
1571 err = dvb_generic_release(inode, file);
1572
1573 module_put(ca->pub->owner);
1574
1575 return err;
1576 }
1577
1578
1579 /**
1580 * Implementation of poll() syscall.
1581 *
1582 * @param file File concerned.
1583 * @param wait poll wait table.
1584 *
1585 * @return Standard poll mask.
1586 */
1587 static unsigned int dvb_ca_en50221_io_poll(struct file *file, poll_table * wait)
1588 {
1589 struct dvb_device *dvbdev = file->private_data;
1590 struct dvb_ca_private *ca = dvbdev->priv;
1591 unsigned int mask = 0;
1592 int slot;
1593 int result = 0;
1594
1595 dprintk("%s\n", __func__);
1596
1597 if (dvb_ca_en50221_io_read_condition(ca, &result, &slot) == 1) {
1598 mask |= POLLIN;
1599 }
1600
1601 /* if there is something, return now */
1602 if (mask)
1603 return mask;
1604
1605 /* wait for something to happen */
1606 poll_wait(file, &ca->wait_queue, wait);
1607
1608 if (dvb_ca_en50221_io_read_condition(ca, &result, &slot) == 1) {
1609 mask |= POLLIN;
1610 }
1611
1612 return mask;
1613 }
1614 EXPORT_SYMBOL(dvb_ca_en50221_init);
1615
1616
1617 static const struct file_operations dvb_ca_fops = {
1618 .owner = THIS_MODULE,
1619 .read = dvb_ca_en50221_io_read,
1620 .write = dvb_ca_en50221_io_write,
1621 .unlocked_ioctl = dvb_ca_en50221_io_ioctl,
1622 .open = dvb_ca_en50221_io_open,
1623 .release = dvb_ca_en50221_io_release,
1624 .poll = dvb_ca_en50221_io_poll,
1625 };
1626
1627 static struct dvb_device dvbdev_ca = {
1628 .priv = NULL,
1629 .users = 1,
1630 .readers = 1,
1631 .writers = 1,
1632 .fops = &dvb_ca_fops,
1633 };
1634
1635
1636 /* ******************************************************************************** */
1637 /* Initialisation/shutdown functions */
1638
1639
1640 /**
1641 * Initialise a new DVB CA EN50221 interface device.
1642 *
1643 * @param dvb_adapter DVB adapter to attach the new CA device to.
1644 * @param ca The dvb_ca instance.
1645 * @param flags Flags describing the CA device (DVB_CA_FLAG_*).
1646 * @param slot_count Number of slots supported.
1647 *
1648 * @return 0 on success, nonzero on failure
1649 */
1650 int dvb_ca_en50221_init(struct dvb_adapter *dvb_adapter,
1651 struct dvb_ca_en50221 *pubca, int flags, int slot_count)
1652 {
1653 int ret;
1654 struct dvb_ca_private *ca = NULL;
1655 int i;
1656
1657 dprintk("%s\n", __func__);
1658
1659 if (slot_count < 1)
1660 return -EINVAL;
1661
1662 /* initialise the system data */
1663 if ((ca = kzalloc(sizeof(struct dvb_ca_private), GFP_KERNEL)) == NULL) {
1664 ret = -ENOMEM;
1665 goto error;
1666 }
1667 ca->pub = pubca;
1668 ca->flags = flags;
1669 ca->slot_count = slot_count;
1670 if ((ca->slot_info = kcalloc(slot_count, sizeof(struct dvb_ca_slot), GFP_KERNEL)) == NULL) {
1671 ret = -ENOMEM;
1672 goto error;
1673 }
1674 init_waitqueue_head(&ca->wait_queue);
1675 ca->open = 0;
1676 ca->wakeup = 0;
1677 ca->next_read_slot = 0;
1678 pubca->private = ca;
1679
1680 /* register the DVB device */
1681 ret = dvb_register_device(dvb_adapter, &ca->dvbdev, &dvbdev_ca, ca, DVB_DEVICE_CA);
1682 if (ret)
1683 goto error;
1684
1685 /* now initialise each slot */
1686 for (i = 0; i < slot_count; i++) {
1687 memset(&ca->slot_info[i], 0, sizeof(struct dvb_ca_slot));
1688 ca->slot_info[i].slot_state = DVB_CA_SLOTSTATE_NONE;
1689 atomic_set(&ca->slot_info[i].camchange_count, 0);
1690 ca->slot_info[i].camchange_type = DVB_CA_EN50221_CAMCHANGE_REMOVED;
1691 mutex_init(&ca->slot_info[i].slot_lock);
1692 }
1693
1694 if (signal_pending(current)) {
1695 ret = -EINTR;
1696 goto error;
1697 }
1698 mb();
1699
1700 /* create a kthread for monitoring this CA device */
1701 ca->thread = kthread_run(dvb_ca_en50221_thread, ca, "kdvb-ca-%i:%i",
1702 ca->dvbdev->adapter->num, ca->dvbdev->id);
1703 if (IS_ERR(ca->thread)) {
1704 ret = PTR_ERR(ca->thread);
1705 printk("dvb_ca_init: failed to start kernel_thread (%d)\n",
1706 ret);
1707 goto error;
1708 }
1709 return 0;
1710
1711 error:
1712 if (ca != NULL) {
1713 if (ca->dvbdev != NULL)
1714 dvb_unregister_device(ca->dvbdev);
1715 kfree(ca->slot_info);
1716 kfree(ca);
1717 }
1718 pubca->private = NULL;
1719 return ret;
1720 }
1721 EXPORT_SYMBOL(dvb_ca_en50221_release);
1722
1723
1724
1725 /**
1726 * Release a DVB CA EN50221 interface device.
1727 *
1728 * @param ca_dev The dvb_device_t instance for the CA device.
1729 * @param ca The associated dvb_ca instance.
1730 */
1731 void dvb_ca_en50221_release(struct dvb_ca_en50221 *pubca)
1732 {
1733 struct dvb_ca_private *ca = pubca->private;
1734 int i;
1735
1736 dprintk("%s\n", __func__);
1737
1738 /* shutdown the thread if there was one */
1739 kthread_stop(ca->thread);
1740
1741 for (i = 0; i < ca->slot_count; i++) {
1742 dvb_ca_en50221_slot_shutdown(ca, i);
1743 vfree(ca->slot_info[i].rx_buffer.data);
1744 }
1745 kfree(ca->slot_info);
1746 dvb_unregister_device(ca->dvbdev);
1747 kfree(ca);
1748 pubca->private = NULL;
1749 }
Linux with added FPC-III support