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V4L/DVB (8130): split dvb_ringbuffer dual-use functions
[firewire-audio.git] / drivers / media / dvb / dvb-core / dvb_ca_en50221.c
blob8e5dd7b1f034b052b8401ad1f6c646707a7127b9
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/kthread.h>
40
41 #include "dvb_ca_en50221.h"
42 #include "dvb_ringbuffer.h"
43
44 static int dvb_ca_en50221_debug;
45
46 module_param_named(cam_debug, dvb_ca_en50221_debug, int, 0644);
47 MODULE_PARM_DESC(cam_debug, "enable verbose debug messages");
48
49 #define dprintk if (dvb_ca_en50221_debug) printk
50
51 #define INIT_TIMEOUT_SECS 10
52
53 #define HOST_LINK_BUF_SIZE 0x200
54
55 #define RX_BUFFER_SIZE 65535
56
57 #define MAX_RX_PACKETS_PER_ITERATION 10
58
59 #define CTRLIF_DATA 0
60 #define CTRLIF_COMMAND 1
61 #define CTRLIF_STATUS 1
62 #define CTRLIF_SIZE_LOW 2
63 #define CTRLIF_SIZE_HIGH 3
64
65 #define CMDREG_HC 1 /* Host control */
66 #define CMDREG_SW 2 /* Size write */
67 #define CMDREG_SR 4 /* Size read */
68 #define CMDREG_RS 8 /* Reset interface */
69 #define CMDREG_FRIE 0x40 /* Enable FR interrupt */
70 #define CMDREG_DAIE 0x80 /* Enable DA interrupt */
71 #define IRQEN (CMDREG_DAIE)
72
73 #define STATUSREG_RE 1 /* read error */
74 #define STATUSREG_WE 2 /* write error */
75 #define STATUSREG_FR 0x40 /* module free */
76 #define STATUSREG_DA 0x80 /* data available */
77 #define STATUSREG_TXERR (STATUSREG_RE|STATUSREG_WE) /* general transfer error */
78
79
80 #define DVB_CA_SLOTSTATE_NONE 0
81 #define DVB_CA_SLOTSTATE_UNINITIALISED 1
82 #define DVB_CA_SLOTSTATE_RUNNING 2
83 #define DVB_CA_SLOTSTATE_INVALID 3
84 #define DVB_CA_SLOTSTATE_WAITREADY 4
85 #define DVB_CA_SLOTSTATE_VALIDATE 5
86 #define DVB_CA_SLOTSTATE_WAITFR 6
87 #define DVB_CA_SLOTSTATE_LINKINIT 7
88
89
90 /* Information on a CA slot */
91 struct dvb_ca_slot {
92
93 /* current state of the CAM */
94 int slot_state;
95
96 /* Number of CAMCHANGES that have occurred since last processing */
97 atomic_t camchange_count;
98
99 /* Type of last CAMCHANGE */
100 int camchange_type;
101
102 /* base address of CAM config */
103 u32 config_base;
104
105 /* value to write into Config Control register */
106 u8 config_option;
107
108 /* if 1, the CAM supports DA IRQs */
109 u8 da_irq_supported:1;
110
111 /* size of the buffer to use when talking to the CAM */
112 int link_buf_size;
113
114 /* buffer for incoming packets */
115 struct dvb_ringbuffer rx_buffer;
116
117 /* timer used during various states of the slot */
118 unsigned long timeout;
119 };
120
121 /* Private CA-interface information */
122 struct dvb_ca_private {
123
124 /* pointer back to the public data structure */
125 struct dvb_ca_en50221 *pub;
126
127 /* the DVB device */
128 struct dvb_device *dvbdev;
129
130 /* Flags describing the interface (DVB_CA_FLAG_*) */
131 u32 flags;
132
133 /* number of slots supported by this CA interface */
134 unsigned int slot_count;
135
136 /* information on each slot */
137 struct dvb_ca_slot *slot_info;
138
139 /* wait queues for read() and write() operations */
140 wait_queue_head_t wait_queue;
141
142 /* PID of the monitoring thread */
143 struct task_struct *thread;
144
145 /* Flag indicating if the CA device is open */
146 unsigned int open:1;
147
148 /* Flag indicating the thread should wake up now */
149 unsigned int wakeup:1;
150
151 /* Delay the main thread should use */
152 unsigned long delay;
153
154 /* Slot to start looking for data to read from in the next user-space read operation */
155 int next_read_slot;
156 };
157
158 static void dvb_ca_en50221_thread_wakeup(struct dvb_ca_private *ca);
159 static int dvb_ca_en50221_read_data(struct dvb_ca_private *ca, int slot, u8 * ebuf, int ecount);
160 static int dvb_ca_en50221_write_data(struct dvb_ca_private *ca, int slot, u8 * ebuf, int ecount);
161
162
163 /**
164 * Safely find needle in haystack.
165 *
166 * @param haystack Buffer to look in.
167 * @param hlen Number of bytes in haystack.
168 * @param needle Buffer to find.
169 * @param nlen Number of bytes in needle.
170 * @return Pointer into haystack needle was found at, or NULL if not found.
171 */
172 static char *findstr(char * haystack, int hlen, char * needle, int nlen)
173 {
174 int i;
175
176 if (hlen < nlen)
177 return NULL;
178
179 for (i = 0; i <= hlen - nlen; i++) {
180 if (!strncmp(haystack + i, needle, nlen))
181 return haystack + i;
182 }
183
184 return NULL;
185 }
186
187
188
189 /* ******************************************************************************** */
190 /* EN50221 physical interface functions */
191
192
193 /**
194 * Check CAM status.
195 */
196 static int dvb_ca_en50221_check_camstatus(struct dvb_ca_private *ca, int slot)
197 {
198 int slot_status;
199 int cam_present_now;
200 int cam_changed;
201
202 /* IRQ mode */
203 if (ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE) {
204 return (atomic_read(&ca->slot_info[slot].camchange_count) != 0);
205 }
206
207 /* poll mode */
208 slot_status = ca->pub->poll_slot_status(ca->pub, slot, ca->open);
209
210 cam_present_now = (slot_status & DVB_CA_EN50221_POLL_CAM_PRESENT) ? 1 : 0;
211 cam_changed = (slot_status & DVB_CA_EN50221_POLL_CAM_CHANGED) ? 1 : 0;
212 if (!cam_changed) {
213 int cam_present_old = (ca->slot_info[slot].slot_state != DVB_CA_SLOTSTATE_NONE);
214 cam_changed = (cam_present_now != cam_present_old);
215 }
216
217 if (cam_changed) {
218 if (!cam_present_now) {
219 ca->slot_info[slot].camchange_type = DVB_CA_EN50221_CAMCHANGE_REMOVED;
220 } else {
221 ca->slot_info[slot].camchange_type = DVB_CA_EN50221_CAMCHANGE_INSERTED;
222 }
223 atomic_set(&ca->slot_info[slot].camchange_count, 1);
224 } else {
225 if ((ca->slot_info[slot].slot_state == DVB_CA_SLOTSTATE_WAITREADY) &&
226 (slot_status & DVB_CA_EN50221_POLL_CAM_READY)) {
227 // move to validate state if reset is completed
228 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_VALIDATE;
229 }
230 }
231
232 return cam_changed;
233 }
234
235
236 /**
237 * Wait for flags to become set on the STATUS register on a CAM interface,
238 * checking for errors and timeout.
239 *
240 * @param ca CA instance.
241 * @param slot Slot on interface.
242 * @param waitfor Flags to wait for.
243 * @param timeout_ms Timeout in milliseconds.
244 *
245 * @return 0 on success, nonzero on error.
246 */
247 static int dvb_ca_en50221_wait_if_status(struct dvb_ca_private *ca, int slot,
248 u8 waitfor, int timeout_hz)
249 {
250 unsigned long timeout;
251 unsigned long start;
252
253 dprintk("%s\n", __func__);
254
255 /* loop until timeout elapsed */
256 start = jiffies;
257 timeout = jiffies + timeout_hz;
258 while (1) {
259 /* read the status and check for error */
260 int res = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS);
261 if (res < 0)
262 return -EIO;
263
264 /* if we got the flags, it was successful! */
265 if (res & waitfor) {
266 dprintk("%s succeeded timeout:%lu\n", __func__, jiffies - start);
267 return 0;
268 }
269
270 /* check for timeout */
271 if (time_after(jiffies, timeout)) {
272 break;
273 }
274
275 /* wait for a bit */
276 msleep(1);
277 }
278
279 dprintk("%s failed timeout:%lu\n", __func__, jiffies - start);
280
281 /* if we get here, we've timed out */
282 return -ETIMEDOUT;
283 }
284
285
286 /**
287 * Initialise the link layer connection to a CAM.
288 *
289 * @param ca CA instance.
290 * @param slot Slot id.
291 *
292 * @return 0 on success, nonzero on failure.
293 */
294 static int dvb_ca_en50221_link_init(struct dvb_ca_private *ca, int slot)
295 {
296 int ret;
297 int buf_size;
298 u8 buf[2];
299
300 dprintk("%s\n", __func__);
301
302 /* we'll be determining these during this function */
303 ca->slot_info[slot].da_irq_supported = 0;
304
305 /* set the host link buffer size temporarily. it will be overwritten with the
306 * real negotiated size later. */
307 ca->slot_info[slot].link_buf_size = 2;
308
309 /* read the buffer size from the CAM */
310 if ((ret = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, IRQEN | CMDREG_SR)) != 0)
311 return ret;
312 if ((ret = dvb_ca_en50221_wait_if_status(ca, slot, STATUSREG_DA, HZ / 10)) != 0)
313 return ret;
314 if ((ret = dvb_ca_en50221_read_data(ca, slot, buf, 2)) != 2)
315 return -EIO;
316 if ((ret = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, IRQEN)) != 0)
317 return ret;
318
319 /* store it, and choose the minimum of our buffer and the CAM's buffer size */
320 buf_size = (buf[0] << 8) | buf[1];
321 if (buf_size > HOST_LINK_BUF_SIZE)
322 buf_size = HOST_LINK_BUF_SIZE;
323 ca->slot_info[slot].link_buf_size = buf_size;
324 buf[0] = buf_size >> 8;
325 buf[1] = buf_size & 0xff;
326 dprintk("Chosen link buffer size of %i\n", buf_size);
327
328 /* write the buffer size to the CAM */
329 if ((ret = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, IRQEN | CMDREG_SW)) != 0)
330 return ret;
331 if ((ret = dvb_ca_en50221_wait_if_status(ca, slot, STATUSREG_FR, HZ / 10)) != 0)
332 return ret;
333 if ((ret = dvb_ca_en50221_write_data(ca, slot, buf, 2)) != 2)
334 return -EIO;
335 if ((ret = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, IRQEN)) != 0)
336 return ret;
337
338 /* success */
339 return 0;
340 }
341
342 /**
343 * Read a tuple from attribute memory.
344 *
345 * @param ca CA instance.
346 * @param slot Slot id.
347 * @param address Address to read from. Updated.
348 * @param tupleType Tuple id byte. Updated.
349 * @param tupleLength Tuple length. Updated.
350 * @param tuple Dest buffer for tuple (must be 256 bytes). Updated.
351 *
352 * @return 0 on success, nonzero on error.
353 */
354 static int dvb_ca_en50221_read_tuple(struct dvb_ca_private *ca, int slot,
355 int *address, int *tupleType, int *tupleLength, u8 * tuple)
356 {
357 int i;
358 int _tupleType;
359 int _tupleLength;
360 int _address = *address;
361
362 /* grab the next tuple length and type */
363 if ((_tupleType = ca->pub->read_attribute_mem(ca->pub, slot, _address)) < 0)
364 return _tupleType;
365 if (_tupleType == 0xff) {
366 dprintk("END OF CHAIN TUPLE type:0x%x\n", _tupleType);
367 *address += 2;
368 *tupleType = _tupleType;
369 *tupleLength = 0;
370 return 0;
371 }
372 if ((_tupleLength = ca->pub->read_attribute_mem(ca->pub, slot, _address + 2)) < 0)
373 return _tupleLength;
374 _address += 4;
375
376 dprintk("TUPLE type:0x%x length:%i\n", _tupleType, _tupleLength);
377
378 /* read in the whole tuple */
379 for (i = 0; i < _tupleLength; i++) {
380 tuple[i] = ca->pub->read_attribute_mem(ca->pub, slot, _address + (i * 2));
381 dprintk(" 0x%02x: 0x%02x %c\n",
382 i, tuple[i] & 0xff,
383 ((tuple[i] > 31) && (tuple[i] < 127)) ? tuple[i] : '.');
384 }
385 _address += (_tupleLength * 2);
386
387 // success
388 *tupleType = _tupleType;
389 *tupleLength = _tupleLength;
390 *address = _address;
391 return 0;
392 }
393
394
395 /**
396 * Parse attribute memory of a CAM module, extracting Config register, and checking
397 * it is a DVB CAM module.
398 *
399 * @param ca CA instance.
400 * @param slot Slot id.
401 *
402 * @return 0 on success, <0 on failure.
403 */
404 static int dvb_ca_en50221_parse_attributes(struct dvb_ca_private *ca, int slot)
405 {
406 int address = 0;
407 int tupleLength;
408 int tupleType;
409 u8 tuple[257];
410 char *dvb_str;
411 int rasz;
412 int status;
413 int got_cftableentry = 0;
414 int end_chain = 0;
415 int i;
416 u16 manfid = 0;
417 u16 devid = 0;
418
419
420 // CISTPL_DEVICE_0A
421 if ((status =
422 dvb_ca_en50221_read_tuple(ca, slot, &address, &tupleType, &tupleLength, tuple)) < 0)
423 return status;
424 if (tupleType != 0x1D)
425 return -EINVAL;
426
427
428
429 // CISTPL_DEVICE_0C
430 if ((status =
431 dvb_ca_en50221_read_tuple(ca, slot, &address, &tupleType, &tupleLength, tuple)) < 0)
432 return status;
433 if (tupleType != 0x1C)
434 return -EINVAL;
435
436
437
438 // CISTPL_VERS_1
439 if ((status =
440 dvb_ca_en50221_read_tuple(ca, slot, &address, &tupleType, &tupleLength, tuple)) < 0)
441 return status;
442 if (tupleType != 0x15)
443 return -EINVAL;
444
445
446
447 // CISTPL_MANFID
448 if ((status = dvb_ca_en50221_read_tuple(ca, slot, &address, &tupleType,
449 &tupleLength, tuple)) < 0)
450 return status;
451 if (tupleType != 0x20)
452 return -EINVAL;
453 if (tupleLength != 4)
454 return -EINVAL;
455 manfid = (tuple[1] << 8) | tuple[0];
456 devid = (tuple[3] << 8) | tuple[2];
457
458
459
460 // CISTPL_CONFIG
461 if ((status = dvb_ca_en50221_read_tuple(ca, slot, &address, &tupleType,
462 &tupleLength, tuple)) < 0)
463 return status;
464 if (tupleType != 0x1A)
465 return -EINVAL;
466 if (tupleLength < 3)
467 return -EINVAL;
468
469 /* extract the configbase */
470 rasz = tuple[0] & 3;
471 if (tupleLength < (3 + rasz + 14))
472 return -EINVAL;
473 ca->slot_info[slot].config_base = 0;
474 for (i = 0; i < rasz + 1; i++) {
475 ca->slot_info[slot].config_base |= (tuple[2 + i] << (8 * i));
476 }
477
478 /* check it contains the correct DVB string */
479 dvb_str = findstr((char *)tuple, tupleLength, "DVB_CI_V", 8);
480 if (dvb_str == NULL)
481 return -EINVAL;
482 if (tupleLength < ((dvb_str - (char *) tuple) + 12))
483 return -EINVAL;
484
485 /* is it a version we support? */
486 if (strncmp(dvb_str + 8, "1.00", 4)) {
487 printk("dvb_ca adapter %d: Unsupported DVB CAM module version %c%c%c%c\n",
488 ca->dvbdev->adapter->num, dvb_str[8], dvb_str[9], dvb_str[10], dvb_str[11]);
489 return -EINVAL;
490 }
491
492 /* process the CFTABLE_ENTRY tuples, and any after those */
493 while ((!end_chain) && (address < 0x1000)) {
494 if ((status = dvb_ca_en50221_read_tuple(ca, slot, &address, &tupleType,
495 &tupleLength, tuple)) < 0)
496 return status;
497 switch (tupleType) {
498 case 0x1B: // CISTPL_CFTABLE_ENTRY
499 if (tupleLength < (2 + 11 + 17))
500 break;
501
502 /* if we've already parsed one, just use it */
503 if (got_cftableentry)
504 break;
505
506 /* get the config option */
507 ca->slot_info[slot].config_option = tuple[0] & 0x3f;
508
509 /* OK, check it contains the correct strings */
510 if ((findstr((char *)tuple, tupleLength, "DVB_HOST", 8) == NULL) ||
511 (findstr((char *)tuple, tupleLength, "DVB_CI_MODULE", 13) == NULL))
512 break;
513
514 got_cftableentry = 1;
515 break;
516
517 case 0x14: // CISTPL_NO_LINK
518 break;
519
520 case 0xFF: // CISTPL_END
521 end_chain = 1;
522 break;
523
524 default: /* Unknown tuple type - just skip this tuple and move to the next one */
525 dprintk("dvb_ca: Skipping unknown tuple type:0x%x length:0x%x\n", tupleType,
526 tupleLength);
527 break;
528 }
529 }
530
531 if ((address > 0x1000) || (!got_cftableentry))
532 return -EINVAL;
533
534 dprintk("Valid DVB CAM detected MANID:%x DEVID:%x CONFIGBASE:0x%x CONFIGOPTION:0x%x\n",
535 manfid, devid, ca->slot_info[slot].config_base, ca->slot_info[slot].config_option);
536
537 // success!
538 return 0;
539 }
540
541
542 /**
543 * Set CAM's configoption correctly.
544 *
545 * @param ca CA instance.
546 * @param slot Slot containing the CAM.
547 */
548 static int dvb_ca_en50221_set_configoption(struct dvb_ca_private *ca, int slot)
549 {
550 int configoption;
551
552 dprintk("%s\n", __func__);
553
554 /* set the config option */
555 ca->pub->write_attribute_mem(ca->pub, slot,
556 ca->slot_info[slot].config_base,
557 ca->slot_info[slot].config_option);
558
559 /* check it */
560 configoption = ca->pub->read_attribute_mem(ca->pub, slot, ca->slot_info[slot].config_base);
561 dprintk("Set configoption 0x%x, read configoption 0x%x\n",
562 ca->slot_info[slot].config_option, configoption & 0x3f);
563
564 /* fine! */
565 return 0;
566
567 }
568
569
570 /**
571 * This function talks to an EN50221 CAM control interface. It reads a buffer of
572 * data from the CAM. The data can either be stored in a supplied buffer, or
573 * automatically be added to the slot's rx_buffer.
574 *
575 * @param ca CA instance.
576 * @param slot Slot to read from.
577 * @param ebuf If non-NULL, the data will be written to this buffer. If NULL,
578 * the data will be added into the buffering system as a normal fragment.
579 * @param ecount Size of ebuf. Ignored if ebuf is NULL.
580 *
581 * @return Number of bytes read, or < 0 on error
582 */
583 static int dvb_ca_en50221_read_data(struct dvb_ca_private *ca, int slot, u8 * ebuf, int ecount)
584 {
585 int bytes_read;
586 int status;
587 u8 buf[HOST_LINK_BUF_SIZE];
588 int i;
589
590 dprintk("%s\n", __func__);
591
592 /* check if we have space for a link buf in the rx_buffer */
593 if (ebuf == NULL) {
594 int buf_free;
595
596 if (ca->slot_info[slot].rx_buffer.data == NULL) {
597 status = -EIO;
598 goto exit;
599 }
600 buf_free = dvb_ringbuffer_free(&ca->slot_info[slot].rx_buffer);
601
602 if (buf_free < (ca->slot_info[slot].link_buf_size + DVB_RINGBUFFER_PKTHDRSIZE)) {
603 status = -EAGAIN;
604 goto exit;
605 }
606 }
607
608 /* check if there is data available */
609 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS)) < 0)
610 goto exit;
611 if (!(status & STATUSREG_DA)) {
612 /* no data */
613 status = 0;
614 goto exit;
615 }
616
617 /* read the amount of data */
618 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_SIZE_HIGH)) < 0)
619 goto exit;
620 bytes_read = status << 8;
621 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_SIZE_LOW)) < 0)
622 goto exit;
623 bytes_read |= status;
624
625 /* check it will fit */
626 if (ebuf == NULL) {
627 if (bytes_read > ca->slot_info[slot].link_buf_size) {
628 printk("dvb_ca adapter %d: CAM tried to send a buffer larger than the link buffer size (%i > %i)!\n",
629 ca->dvbdev->adapter->num, bytes_read, ca->slot_info[slot].link_buf_size);
630 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_LINKINIT;
631 status = -EIO;
632 goto exit;
633 }
634 if (bytes_read < 2) {
635 printk("dvb_ca adapter %d: CAM sent a buffer that was less than 2 bytes!\n",
636 ca->dvbdev->adapter->num);
637 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_LINKINIT;
638 status = -EIO;
639 goto exit;
640 }
641 } else {
642 if (bytes_read > ecount) {
643 printk("dvb_ca adapter %d: CAM tried to send a buffer larger than the ecount size!\n",
644 ca->dvbdev->adapter->num);
645 status = -EIO;
646 goto exit;
647 }
648 }
649
650 /* fill the buffer */
651 for (i = 0; i < bytes_read; i++) {
652 /* read byte and check */
653 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_DATA)) < 0)
654 goto exit;
655
656 /* OK, store it in the buffer */
657 buf[i] = status;
658 }
659
660 /* check for read error (RE should now be 0) */
661 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS)) < 0)
662 goto exit;
663 if (status & STATUSREG_RE) {
664 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_LINKINIT;
665 status = -EIO;
666 goto exit;
667 }
668
669 /* OK, add it to the receive buffer, or copy into external buffer if supplied */
670 if (ebuf == NULL) {
671 if (ca->slot_info[slot].rx_buffer.data == NULL) {
672 status = -EIO;
673 goto exit;
674 }
675 dvb_ringbuffer_pkt_write(&ca->slot_info[slot].rx_buffer, buf, bytes_read);
676 } else {
677 memcpy(ebuf, buf, bytes_read);
678 }
679
680 dprintk("Received CA packet for slot %i connection id 0x%x last_frag:%i size:0x%x\n", slot,
681 buf[0], (buf[1] & 0x80) == 0, bytes_read);
682
683 /* wake up readers when a last_fragment is received */
684 if ((buf[1] & 0x80) == 0x00) {
685 wake_up_interruptible(&ca->wait_queue);
686 }
687 status = bytes_read;
688
689 exit:
690 return status;
691 }
692
693
694 /**
695 * This function talks to an EN50221 CAM control interface. It writes a buffer of data
696 * to a CAM.
697 *
698 * @param ca CA instance.
699 * @param slot Slot to write to.
700 * @param ebuf The data in this buffer is treated as a complete link-level packet to
701 * be written.
702 * @param count Size of ebuf.
703 *
704 * @return Number of bytes written, or < 0 on error.
705 */
706 static int dvb_ca_en50221_write_data(struct dvb_ca_private *ca, int slot, u8 * buf, int bytes_write)
707 {
708 int status;
709 int i;
710
711 dprintk("%s\n", __func__);
712
713
714 // sanity check
715 if (bytes_write > ca->slot_info[slot].link_buf_size)
716 return -EINVAL;
717
718 /* check if interface is actually waiting for us to read from it, or if a read is in progress */
719 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS)) < 0)
720 goto exitnowrite;
721 if (status & (STATUSREG_DA | STATUSREG_RE)) {
722 status = -EAGAIN;
723 goto exitnowrite;
724 }
725
726 /* OK, set HC bit */
727 if ((status = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND,
728 IRQEN | CMDREG_HC)) != 0)
729 goto exit;
730
731 /* check if interface is still free */
732 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS)) < 0)
733 goto exit;
734 if (!(status & STATUSREG_FR)) {
735 /* it wasn't free => try again later */
736 status = -EAGAIN;
737 goto exit;
738 }
739
740 /* send the amount of data */
741 if ((status = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_SIZE_HIGH, bytes_write >> 8)) != 0)
742 goto exit;
743 if ((status = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_SIZE_LOW,
744 bytes_write & 0xff)) != 0)
745 goto exit;
746
747 /* send the buffer */
748 for (i = 0; i < bytes_write; i++) {
749 if ((status = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_DATA, buf[i])) != 0)
750 goto exit;
751 }
752
753 /* check for write error (WE should now be 0) */
754 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS)) < 0)
755 goto exit;
756 if (status & STATUSREG_WE) {
757 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_LINKINIT;
758 status = -EIO;
759 goto exit;
760 }
761 status = bytes_write;
762
763 dprintk("Wrote CA packet for slot %i, connection id 0x%x last_frag:%i size:0x%x\n", slot,
764 buf[0], (buf[1] & 0x80) == 0, bytes_write);
765
766 exit:
767 ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, IRQEN);
768
769 exitnowrite:
770 return status;
771 }
772 EXPORT_SYMBOL(dvb_ca_en50221_camchange_irq);
773
774
775
776 /* ******************************************************************************** */
777 /* EN50221 higher level functions */
778
779
780 /**
781 * A CAM has been removed => shut it down.
782 *
783 * @param ca CA instance.
784 * @param slot Slot to shut down.
785 */
786 static int dvb_ca_en50221_slot_shutdown(struct dvb_ca_private *ca, int slot)
787 {
788 dprintk("%s\n", __func__);
789
790 ca->pub->slot_shutdown(ca->pub, slot);
791 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_NONE;
792
793 /* need to wake up all processes to check if they're now
794 trying to write to a defunct CAM */
795 wake_up_interruptible(&ca->wait_queue);
796
797 dprintk("Slot %i shutdown\n", slot);
798
799 /* success */
800 return 0;
801 }
802 EXPORT_SYMBOL(dvb_ca_en50221_camready_irq);
803
804
805 /**
806 * A CAMCHANGE IRQ has occurred.
807 *
808 * @param ca CA instance.
809 * @param slot Slot concerned.
810 * @param change_type One of the DVB_CA_CAMCHANGE_* values.
811 */
812 void dvb_ca_en50221_camchange_irq(struct dvb_ca_en50221 *pubca, int slot, int change_type)
813 {
814 struct dvb_ca_private *ca = pubca->private;
815
816 dprintk("CAMCHANGE IRQ slot:%i change_type:%i\n", slot, change_type);
817
818 switch (change_type) {
819 case DVB_CA_EN50221_CAMCHANGE_REMOVED:
820 case DVB_CA_EN50221_CAMCHANGE_INSERTED:
821 break;
822
823 default:
824 return;
825 }
826
827 ca->slot_info[slot].camchange_type = change_type;
828 atomic_inc(&ca->slot_info[slot].camchange_count);
829 dvb_ca_en50221_thread_wakeup(ca);
830 }
831 EXPORT_SYMBOL(dvb_ca_en50221_frda_irq);
832
833
834 /**
835 * A CAMREADY IRQ has occurred.
836 *
837 * @param ca CA instance.
838 * @param slot Slot concerned.
839 */
840 void dvb_ca_en50221_camready_irq(struct dvb_ca_en50221 *pubca, int slot)
841 {
842 struct dvb_ca_private *ca = pubca->private;
843
844 dprintk("CAMREADY IRQ slot:%i\n", slot);
845
846 if (ca->slot_info[slot].slot_state == DVB_CA_SLOTSTATE_WAITREADY) {
847 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_VALIDATE;
848 dvb_ca_en50221_thread_wakeup(ca);
849 }
850 }
851
852
853 /**
854 * An FR or DA IRQ has occurred.
855 *
856 * @param ca CA instance.
857 * @param slot Slot concerned.
858 */
859 void dvb_ca_en50221_frda_irq(struct dvb_ca_en50221 *pubca, int slot)
860 {
861 struct dvb_ca_private *ca = pubca->private;
862 int flags;
863
864 dprintk("FR/DA IRQ slot:%i\n", slot);
865
866 switch (ca->slot_info[slot].slot_state) {
867 case DVB_CA_SLOTSTATE_LINKINIT:
868 flags = ca->pub->read_cam_control(pubca, slot, CTRLIF_STATUS);
869 if (flags & STATUSREG_DA) {
870 dprintk("CAM supports DA IRQ\n");
871 ca->slot_info[slot].da_irq_supported = 1;
872 }
873 break;
874
875 case DVB_CA_SLOTSTATE_RUNNING:
876 if (ca->open)
877 dvb_ca_en50221_thread_wakeup(ca);
878 break;
879 }
880 }
881
882
883
884 /* ******************************************************************************** */
885 /* EN50221 thread functions */
886
887 /**
888 * Wake up the DVB CA thread
889 *
890 * @param ca CA instance.
891 */
892 static void dvb_ca_en50221_thread_wakeup(struct dvb_ca_private *ca)
893 {
894
895 dprintk("%s\n", __func__);
896
897 ca->wakeup = 1;
898 mb();
899 wake_up_process(ca->thread);
900 }
901
902 /**
903 * Update the delay used by the thread.
904 *
905 * @param ca CA instance.
906 */
907 static void dvb_ca_en50221_thread_update_delay(struct dvb_ca_private *ca)
908 {
909 int delay;
910 int curdelay = 100000000;
911 int slot;
912
913 /* Beware of too high polling frequency, because one polling
914 * call might take several hundred milliseconds until timeout!
915 */
916 for (slot = 0; slot < ca->slot_count; slot++) {
917 switch (ca->slot_info[slot].slot_state) {
918 default:
919 case DVB_CA_SLOTSTATE_NONE:
920 delay = HZ * 60; /* 60s */
921 if (!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE))
922 delay = HZ * 5; /* 5s */
923 break;
924 case DVB_CA_SLOTSTATE_INVALID:
925 delay = HZ * 60; /* 60s */
926 if (!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE))
927 delay = HZ / 10; /* 100ms */
928 break;
929
930 case DVB_CA_SLOTSTATE_UNINITIALISED:
931 case DVB_CA_SLOTSTATE_WAITREADY:
932 case DVB_CA_SLOTSTATE_VALIDATE:
933 case DVB_CA_SLOTSTATE_WAITFR:
934 case DVB_CA_SLOTSTATE_LINKINIT:
935 delay = HZ / 10; /* 100ms */
936 break;
937
938 case DVB_CA_SLOTSTATE_RUNNING:
939 delay = HZ * 60; /* 60s */
940 if (!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE))
941 delay = HZ / 10; /* 100ms */
942 if (ca->open) {
943 if ((!ca->slot_info[slot].da_irq_supported) ||
944 (!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_DA)))
945 delay = HZ / 10; /* 100ms */
946 }
947 break;
948 }
949
950 if (delay < curdelay)
951 curdelay = delay;
952 }
953
954 ca->delay = curdelay;
955 }
956
957
958
959 /**
960 * Kernel thread which monitors CA slots for CAM changes, and performs data transfers.
961 */
962 static int dvb_ca_en50221_thread(void *data)
963 {
964 struct dvb_ca_private *ca = data;
965 int slot;
966 int flags;
967 int status;
968 int pktcount;
969 void *rxbuf;
970
971 dprintk("%s\n", __func__);
972
973 /* choose the correct initial delay */
974 dvb_ca_en50221_thread_update_delay(ca);
975
976 /* main loop */
977 while (!kthread_should_stop()) {
978 /* sleep for a bit */
979 if (!ca->wakeup) {
980 set_current_state(TASK_INTERRUPTIBLE);
981 schedule_timeout(ca->delay);
982 if (kthread_should_stop())
983 return 0;
984 }
985 ca->wakeup = 0;
986
987 /* go through all the slots processing them */
988 for (slot = 0; slot < ca->slot_count; slot++) {
989
990 // check the cam status + deal with CAMCHANGEs
991 while (dvb_ca_en50221_check_camstatus(ca, slot)) {
992 /* clear down an old CI slot if necessary */
993 if (ca->slot_info[slot].slot_state != DVB_CA_SLOTSTATE_NONE)
994 dvb_ca_en50221_slot_shutdown(ca, slot);
995
996 /* if a CAM is NOW present, initialise it */
997 if (ca->slot_info[slot].camchange_type == DVB_CA_EN50221_CAMCHANGE_INSERTED) {
998 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_UNINITIALISED;
999 }
1000
1001 /* we've handled one CAMCHANGE */
1002 dvb_ca_en50221_thread_update_delay(ca);
1003 atomic_dec(&ca->slot_info[slot].camchange_count);
1004 }
1005
1006 // CAM state machine
1007 switch (ca->slot_info[slot].slot_state) {
1008 case DVB_CA_SLOTSTATE_NONE:
1009 case DVB_CA_SLOTSTATE_INVALID:
1010 // no action needed
1011 break;
1012
1013 case DVB_CA_SLOTSTATE_UNINITIALISED:
1014 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_WAITREADY;
1015 ca->pub->slot_reset(ca->pub, slot);
1016 ca->slot_info[slot].timeout = jiffies + (INIT_TIMEOUT_SECS * HZ);
1017 break;
1018
1019 case DVB_CA_SLOTSTATE_WAITREADY:
1020 if (time_after(jiffies, ca->slot_info[slot].timeout)) {
1021 printk("dvb_ca adaptor %d: PC card did not respond :(\n",
1022 ca->dvbdev->adapter->num);
1023 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID;
1024 dvb_ca_en50221_thread_update_delay(ca);
1025 break;
1026 }
1027 // no other action needed; will automatically change state when ready
1028 break;
1029
1030 case DVB_CA_SLOTSTATE_VALIDATE:
1031 if (dvb_ca_en50221_parse_attributes(ca, slot) != 0) {
1032 /* we need this extra check for annoying interfaces like the budget-av */
1033 if ((!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE)) &&
1034 (ca->pub->poll_slot_status)) {
1035 int status = ca->pub->poll_slot_status(ca->pub, slot, 0);
1036 if (!(status & DVB_CA_EN50221_POLL_CAM_PRESENT)) {
1037 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_NONE;
1038 dvb_ca_en50221_thread_update_delay(ca);
1039 break;
1040 }
1041 }
1042
1043 printk("dvb_ca adapter %d: Invalid PC card inserted :(\n",
1044 ca->dvbdev->adapter->num);
1045 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID;
1046 dvb_ca_en50221_thread_update_delay(ca);
1047 break;
1048 }
1049 if (dvb_ca_en50221_set_configoption(ca, slot) != 0) {
1050 printk("dvb_ca adapter %d: Unable to initialise CAM :(\n",
1051 ca->dvbdev->adapter->num);
1052 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID;
1053 dvb_ca_en50221_thread_update_delay(ca);
1054 break;
1055 }
1056 if (ca->pub->write_cam_control(ca->pub, slot,
1057 CTRLIF_COMMAND, CMDREG_RS) != 0) {
1058 printk("dvb_ca adapter %d: Unable to reset CAM IF\n",
1059 ca->dvbdev->adapter->num);
1060 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID;
1061 dvb_ca_en50221_thread_update_delay(ca);
1062 break;
1063 }
1064 dprintk("DVB CAM validated successfully\n");
1065
1066 ca->slot_info[slot].timeout = jiffies + (INIT_TIMEOUT_SECS * HZ);
1067 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_WAITFR;
1068 ca->wakeup = 1;
1069 break;
1070
1071 case DVB_CA_SLOTSTATE_WAITFR:
1072 if (time_after(jiffies, ca->slot_info[slot].timeout)) {
1073 printk("dvb_ca adapter %d: DVB CAM did not respond :(\n",
1074 ca->dvbdev->adapter->num);
1075 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID;
1076 dvb_ca_en50221_thread_update_delay(ca);
1077 break;
1078 }
1079
1080 flags = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS);
1081 if (flags & STATUSREG_FR) {
1082 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_LINKINIT;
1083 ca->wakeup = 1;
1084 }
1085 break;
1086
1087 case DVB_CA_SLOTSTATE_LINKINIT:
1088 if (dvb_ca_en50221_link_init(ca, slot) != 0) {
1089 /* we need this extra check for annoying interfaces like the budget-av */
1090 if ((!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE)) &&
1091 (ca->pub->poll_slot_status)) {
1092 int status = ca->pub->poll_slot_status(ca->pub, slot, 0);
1093 if (!(status & DVB_CA_EN50221_POLL_CAM_PRESENT)) {
1094 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_NONE;
1095 dvb_ca_en50221_thread_update_delay(ca);
1096 break;
1097 }
1098 }
1099
1100 printk("dvb_ca adapter %d: DVB CAM link initialisation failed :(\n", ca->dvbdev->adapter->num);
1101 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID;
1102 dvb_ca_en50221_thread_update_delay(ca);
1103 break;
1104 }
1105
1106 if (ca->slot_info[slot].rx_buffer.data == NULL) {
1107 rxbuf = vmalloc(RX_BUFFER_SIZE);
1108 if (rxbuf == NULL) {
1109 printk("dvb_ca adapter %d: Unable to allocate CAM rx buffer :(\n", ca->dvbdev->adapter->num);
1110 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID;
1111 dvb_ca_en50221_thread_update_delay(ca);
1112 break;
1113 }
1114 dvb_ringbuffer_init(&ca->slot_info[slot].rx_buffer, rxbuf, RX_BUFFER_SIZE);
1115 }
1116
1117 ca->pub->slot_ts_enable(ca->pub, slot);
1118 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_RUNNING;
1119 dvb_ca_en50221_thread_update_delay(ca);
1120 printk("dvb_ca adapter %d: DVB CAM detected and initialised successfully\n", ca->dvbdev->adapter->num);
1121 break;
1122
1123 case DVB_CA_SLOTSTATE_RUNNING:
1124 if (!ca->open)
1125 continue;
1126
1127 // poll slots for data
1128 pktcount = 0;
1129 while ((status = dvb_ca_en50221_read_data(ca, slot, NULL, 0)) > 0) {
1130 if (!ca->open)
1131 break;
1132
1133 /* if a CAMCHANGE occurred at some point, do not do any more processing of this slot */
1134 if (dvb_ca_en50221_check_camstatus(ca, slot)) {
1135 // we dont want to sleep on the next iteration so we can handle the cam change
1136 ca->wakeup = 1;
1137 break;
1138 }
1139
1140 /* check if we've hit our limit this time */
1141 if (++pktcount >= MAX_RX_PACKETS_PER_ITERATION) {
1142 // dont sleep; there is likely to be more data to read
1143 ca->wakeup = 1;
1144 break;
1145 }
1146 }
1147 break;
1148 }
1149 }
1150 }
1151
1152 return 0;
1153 }
1154
1155
1156
1157 /* ******************************************************************************** */
1158 /* EN50221 IO interface functions */
1159
1160 /**
1161 * Real ioctl implementation.
1162 * NOTE: CA_SEND_MSG/CA_GET_MSG ioctls have userspace buffers passed to them.
1163 *
1164 * @param inode Inode concerned.
1165 * @param file File concerned.
1166 * @param cmd IOCTL command.
1167 * @param arg Associated argument.
1168 *
1169 * @return 0 on success, <0 on error.
1170 */
1171 static int dvb_ca_en50221_io_do_ioctl(struct inode *inode, struct file *file,
1172 unsigned int cmd, void *parg)
1173 {
1174 struct dvb_device *dvbdev = file->private_data;
1175 struct dvb_ca_private *ca = dvbdev->priv;
1176 int err = 0;
1177 int slot;
1178
1179 dprintk("%s\n", __func__);
1180
1181 switch (cmd) {
1182 case CA_RESET:
1183 for (slot = 0; slot < ca->slot_count; slot++) {
1184 if (ca->slot_info[slot].slot_state != DVB_CA_SLOTSTATE_NONE) {
1185 dvb_ca_en50221_slot_shutdown(ca, slot);
1186 if (ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE)
1187 dvb_ca_en50221_camchange_irq(ca->pub,
1188 slot,
1189 DVB_CA_EN50221_CAMCHANGE_INSERTED);
1190 }
1191 }
1192 ca->next_read_slot = 0;
1193 dvb_ca_en50221_thread_wakeup(ca);
1194 break;
1195
1196 case CA_GET_CAP: {
1197 struct ca_caps *caps = parg;
1198
1199 caps->slot_num = ca->slot_count;
1200 caps->slot_type = CA_CI_LINK;
1201 caps->descr_num = 0;
1202 caps->descr_type = 0;
1203 break;
1204 }
1205
1206 case CA_GET_SLOT_INFO: {
1207 struct ca_slot_info *info = parg;
1208
1209 if ((info->num > ca->slot_count) || (info->num < 0))
1210 return -EINVAL;
1211
1212 info->type = CA_CI_LINK;
1213 info->flags = 0;
1214 if ((ca->slot_info[info->num].slot_state != DVB_CA_SLOTSTATE_NONE)
1215 && (ca->slot_info[info->num].slot_state != DVB_CA_SLOTSTATE_INVALID)) {
1216 info->flags = CA_CI_MODULE_PRESENT;
1217 }
1218 if (ca->slot_info[info->num].slot_state == DVB_CA_SLOTSTATE_RUNNING) {
1219 info->flags |= CA_CI_MODULE_READY;
1220 }
1221 break;
1222 }
1223
1224 default:
1225 err = -EINVAL;
1226 break;
1227 }
1228
1229 return err;
1230 }
1231
1232
1233 /**
1234 * Wrapper for ioctl implementation.
1235 *
1236 * @param inode Inode concerned.
1237 * @param file File concerned.
1238 * @param cmd IOCTL command.
1239 * @param arg Associated argument.
1240 *
1241 * @return 0 on success, <0 on error.
1242 */
1243 static int dvb_ca_en50221_io_ioctl(struct inode *inode, struct file *file,
1244 unsigned int cmd, unsigned long arg)
1245 {
1246 return dvb_usercopy(inode, file, cmd, arg, dvb_ca_en50221_io_do_ioctl);
1247 }
1248
1249
1250 /**
1251 * Implementation of write() syscall.
1252 *
1253 * @param file File structure.
1254 * @param buf Source buffer.
1255 * @param count Size of source buffer.
1256 * @param ppos Position in file (ignored).
1257 *
1258 * @return Number of bytes read, or <0 on error.
1259 */
1260 static ssize_t dvb_ca_en50221_io_write(struct file *file,
1261 const char __user * buf, size_t count, loff_t * ppos)
1262 {
1263 struct dvb_device *dvbdev = file->private_data;
1264 struct dvb_ca_private *ca = dvbdev->priv;
1265 u8 slot, connection_id;
1266 int status;
1267 u8 fragbuf[HOST_LINK_BUF_SIZE];
1268 int fragpos = 0;
1269 int fraglen;
1270 unsigned long timeout;
1271 int written;
1272
1273 dprintk("%s\n", __func__);
1274
1275 /* Incoming packet has a 2 byte header. hdr[0] = slot_id, hdr[1] = connection_id */
1276 if (count < 2)
1277 return -EINVAL;
1278
1279 /* extract slot & connection id */
1280 if (copy_from_user(&slot, buf, 1))
1281 return -EFAULT;
1282 if (copy_from_user(&connection_id, buf + 1, 1))
1283 return -EFAULT;
1284 buf += 2;
1285 count -= 2;
1286
1287 /* check if the slot is actually running */
1288 if (ca->slot_info[slot].slot_state != DVB_CA_SLOTSTATE_RUNNING)
1289 return -EINVAL;
1290
1291 /* fragment the packets & store in the buffer */
1292 while (fragpos < count) {
1293 fraglen = ca->slot_info[slot].link_buf_size - 2;
1294 if ((count - fragpos) < fraglen)
1295 fraglen = count - fragpos;
1296
1297 fragbuf[0] = connection_id;
1298 fragbuf[1] = ((fragpos + fraglen) < count) ? 0x80 : 0x00;
1299 if ((status = copy_from_user(fragbuf + 2, buf + fragpos, fraglen)) != 0)
1300 goto exit;
1301
1302 timeout = jiffies + HZ / 2;
1303 written = 0;
1304 while (!time_after(jiffies, timeout)) {
1305 /* check the CAM hasn't been removed/reset in the meantime */
1306 if (ca->slot_info[slot].slot_state != DVB_CA_SLOTSTATE_RUNNING) {
1307 status = -EIO;
1308 goto exit;
1309 }
1310
1311 status = dvb_ca_en50221_write_data(ca, slot, fragbuf, fraglen + 2);
1312 if (status == (fraglen + 2)) {
1313 written = 1;
1314 break;
1315 }
1316 if (status != -EAGAIN)
1317 goto exit;
1318
1319 msleep(1);
1320 }
1321 if (!written) {
1322 status = -EIO;
1323 goto exit;
1324 }
1325
1326 fragpos += fraglen;
1327 }
1328 status = count + 2;
1329
1330 exit:
1331 return status;
1332 }
1333
1334
1335 /**
1336 * Condition for waking up in dvb_ca_en50221_io_read_condition
1337 */
1338 static int dvb_ca_en50221_io_read_condition(struct dvb_ca_private *ca,
1339 int *result, int *_slot)
1340 {
1341 int slot;
1342 int slot_count = 0;
1343 int idx;
1344 size_t fraglen;
1345 int connection_id = -1;
1346 int found = 0;
1347 u8 hdr[2];
1348
1349 slot = ca->next_read_slot;
1350 while ((slot_count < ca->slot_count) && (!found)) {
1351 if (ca->slot_info[slot].slot_state != DVB_CA_SLOTSTATE_RUNNING)
1352 goto nextslot;
1353
1354 if (ca->slot_info[slot].rx_buffer.data == NULL) {
1355 return 0;
1356 }
1357
1358 idx = dvb_ringbuffer_pkt_next(&ca->slot_info[slot].rx_buffer, -1, &fraglen);
1359 while (idx != -1) {
1360 dvb_ringbuffer_pkt_read(&ca->slot_info[slot].rx_buffer, idx, 0, hdr, 2);
1361 if (connection_id == -1)
1362 connection_id = hdr[0];
1363 if ((hdr[0] == connection_id) && ((hdr[1] & 0x80) == 0)) {
1364 *_slot = slot;
1365 found = 1;
1366 break;
1367 }
1368
1369 idx = dvb_ringbuffer_pkt_next(&ca->slot_info[slot].rx_buffer, idx, &fraglen);
1370 }
1371
1372 nextslot:
1373 slot = (slot + 1) % ca->slot_count;
1374 slot_count++;
1375 }
1376
1377 ca->next_read_slot = slot;
1378 return found;
1379 }
1380
1381
1382 /**
1383 * Implementation of read() syscall.
1384 *
1385 * @param file File structure.
1386 * @param buf Destination buffer.
1387 * @param count Size of destination buffer.
1388 * @param ppos Position in file (ignored).
1389 *
1390 * @return Number of bytes read, or <0 on error.
1391 */
1392 static ssize_t dvb_ca_en50221_io_read(struct file *file, char __user * buf,
1393 size_t count, loff_t * ppos)
1394 {
1395 struct dvb_device *dvbdev = file->private_data;
1396 struct dvb_ca_private *ca = dvbdev->priv;
1397 int status;
1398 int result = 0;
1399 u8 hdr[2];
1400 int slot;
1401 int connection_id = -1;
1402 size_t idx, idx2;
1403 int last_fragment = 0;
1404 size_t fraglen;
1405 int pktlen;
1406 int dispose = 0;
1407
1408 dprintk("%s\n", __func__);
1409
1410 /* Outgoing packet has a 2 byte header. hdr[0] = slot_id, hdr[1] = connection_id */
1411 if (count < 2)
1412 return -EINVAL;
1413
1414 /* wait for some data */
1415 if ((status = dvb_ca_en50221_io_read_condition(ca, &result, &slot)) == 0) {
1416
1417 /* if we're in nonblocking mode, exit immediately */
1418 if (file->f_flags & O_NONBLOCK)
1419 return -EWOULDBLOCK;
1420
1421 /* wait for some data */
1422 status = wait_event_interruptible(ca->wait_queue,
1423 dvb_ca_en50221_io_read_condition
1424 (ca, &result, &slot));
1425 }
1426 if ((status < 0) || (result < 0)) {
1427 if (result)
1428 return result;
1429 return status;
1430 }
1431
1432 idx = dvb_ringbuffer_pkt_next(&ca->slot_info[slot].rx_buffer, -1, &fraglen);
1433 pktlen = 2;
1434 do {
1435 if (idx == -1) {
1436 printk("dvb_ca adapter %d: BUG: read packet ended before last_fragment encountered\n", ca->dvbdev->adapter->num);
1437 status = -EIO;
1438 goto exit;
1439 }
1440
1441 dvb_ringbuffer_pkt_read(&ca->slot_info[slot].rx_buffer, idx, 0, hdr, 2);
1442 if (connection_id == -1)
1443 connection_id = hdr[0];
1444 if (hdr[0] == connection_id) {
1445 if (pktlen < count) {
1446 if ((pktlen + fraglen - 2) > count) {
1447 fraglen = count - pktlen;
1448 } else {
1449 fraglen -= 2;
1450 }
1451
1452 if ((status = dvb_ringbuffer_pkt_read_user(&ca->slot_info[slot].rx_buffer, idx, 2,
1453 buf + pktlen, fraglen)) < 0) {
1454 goto exit;
1455 }
1456 pktlen += fraglen;
1457 }
1458
1459 if ((hdr[1] & 0x80) == 0)
1460 last_fragment = 1;
1461 dispose = 1;
1462 }
1463
1464 idx2 = dvb_ringbuffer_pkt_next(&ca->slot_info[slot].rx_buffer, idx, &fraglen);
1465 if (dispose)
1466 dvb_ringbuffer_pkt_dispose(&ca->slot_info[slot].rx_buffer, idx);
1467 idx = idx2;
1468 dispose = 0;
1469 } while (!last_fragment);
1470
1471 hdr[0] = slot;
1472 hdr[1] = connection_id;
1473 if ((status = copy_to_user(buf, hdr, 2)) != 0)
1474 goto exit;
1475 status = pktlen;
1476
1477 exit:
1478 return status;
1479 }
1480
1481
1482 /**
1483 * Implementation of file open syscall.
1484 *
1485 * @param inode Inode concerned.
1486 * @param file File concerned.
1487 *
1488 * @return 0 on success, <0 on failure.
1489 */
1490 static int dvb_ca_en50221_io_open(struct inode *inode, struct file *file)
1491 {
1492 struct dvb_device *dvbdev = file->private_data;
1493 struct dvb_ca_private *ca = dvbdev->priv;
1494 int err;
1495 int i;
1496
1497 dprintk("%s\n", __func__);
1498
1499 if (!try_module_get(ca->pub->owner))
1500 return -EIO;
1501
1502 err = dvb_generic_open(inode, file);
1503 if (err < 0) {
1504 module_put(ca->pub->owner);
1505 return err;
1506 }
1507
1508 for (i = 0; i < ca->slot_count; i++) {
1509
1510 if (ca->slot_info[i].slot_state == DVB_CA_SLOTSTATE_RUNNING) {
1511 if (ca->slot_info[i].rx_buffer.data != NULL) {
1512 /* it is safe to call this here without locks because
1513 * ca->open == 0. Data is not read in this case */
1514 dvb_ringbuffer_flush(&ca->slot_info[i].rx_buffer);
1515 }
1516 }
1517 }
1518
1519 ca->open = 1;
1520 dvb_ca_en50221_thread_update_delay(ca);
1521 dvb_ca_en50221_thread_wakeup(ca);
1522
1523 return 0;
1524 }
1525
1526
1527 /**
1528 * Implementation of file close syscall.
1529 *
1530 * @param inode Inode concerned.
1531 * @param file File concerned.
1532 *
1533 * @return 0 on success, <0 on failure.
1534 */
1535 static int dvb_ca_en50221_io_release(struct inode *inode, struct file *file)
1536 {
1537 struct dvb_device *dvbdev = file->private_data;
1538 struct dvb_ca_private *ca = dvbdev->priv;
1539 int err;
1540
1541 dprintk("%s\n", __func__);
1542
1543 /* mark the CA device as closed */
1544 ca->open = 0;
1545 dvb_ca_en50221_thread_update_delay(ca);
1546
1547 err = dvb_generic_release(inode, file);
1548
1549 module_put(ca->pub->owner);
1550
1551 return err;
1552 }
1553
1554
1555 /**
1556 * Implementation of poll() syscall.
1557 *
1558 * @param file File concerned.
1559 * @param wait poll wait table.
1560 *
1561 * @return Standard poll mask.
1562 */
1563 static unsigned int dvb_ca_en50221_io_poll(struct file *file, poll_table * wait)
1564 {
1565 struct dvb_device *dvbdev = file->private_data;
1566 struct dvb_ca_private *ca = dvbdev->priv;
1567 unsigned int mask = 0;
1568 int slot;
1569 int result = 0;
1570
1571 dprintk("%s\n", __func__);
1572
1573 if (dvb_ca_en50221_io_read_condition(ca, &result, &slot) == 1) {
1574 mask |= POLLIN;
1575 }
1576
1577 /* if there is something, return now */
1578 if (mask)
1579 return mask;
1580
1581 /* wait for something to happen */
1582 poll_wait(file, &ca->wait_queue, wait);
1583
1584 if (dvb_ca_en50221_io_read_condition(ca, &result, &slot) == 1) {
1585 mask |= POLLIN;
1586 }
1587
1588 return mask;
1589 }
1590 EXPORT_SYMBOL(dvb_ca_en50221_init);
1591
1592
1593 static struct file_operations dvb_ca_fops = {
1594 .owner = THIS_MODULE,
1595 .read = dvb_ca_en50221_io_read,
1596 .write = dvb_ca_en50221_io_write,
1597 .ioctl = dvb_ca_en50221_io_ioctl,
1598 .open = dvb_ca_en50221_io_open,
1599 .release = dvb_ca_en50221_io_release,
1600 .poll = dvb_ca_en50221_io_poll,
1601 };
1602
1603 static struct dvb_device dvbdev_ca = {
1604 .priv = NULL,
1605 .users = 1,
1606 .readers = 1,
1607 .writers = 1,
1608 .fops = &dvb_ca_fops,
1609 };
1610
1611
1612 /* ******************************************************************************** */
1613 /* Initialisation/shutdown functions */
1614
1615
1616 /**
1617 * Initialise a new DVB CA EN50221 interface device.
1618 *
1619 * @param dvb_adapter DVB adapter to attach the new CA device to.
1620 * @param ca The dvb_ca instance.
1621 * @param flags Flags describing the CA device (DVB_CA_FLAG_*).
1622 * @param slot_count Number of slots supported.
1623 *
1624 * @return 0 on success, nonzero on failure
1625 */
1626 int dvb_ca_en50221_init(struct dvb_adapter *dvb_adapter,
1627 struct dvb_ca_en50221 *pubca, int flags, int slot_count)
1628 {
1629 int ret;
1630 struct dvb_ca_private *ca = NULL;
1631 int i;
1632
1633 dprintk("%s\n", __func__);
1634
1635 if (slot_count < 1)
1636 return -EINVAL;
1637
1638 /* initialise the system data */
1639 if ((ca = kzalloc(sizeof(struct dvb_ca_private), GFP_KERNEL)) == NULL) {
1640 ret = -ENOMEM;
1641 goto error;
1642 }
1643 ca->pub = pubca;
1644 ca->flags = flags;
1645 ca->slot_count = slot_count;
1646 if ((ca->slot_info = kcalloc(slot_count, sizeof(struct dvb_ca_slot), GFP_KERNEL)) == NULL) {
1647 ret = -ENOMEM;
1648 goto error;
1649 }
1650 init_waitqueue_head(&ca->wait_queue);
1651 ca->open = 0;
1652 ca->wakeup = 0;
1653 ca->next_read_slot = 0;
1654 pubca->private = ca;
1655
1656 /* register the DVB device */
1657 ret = dvb_register_device(dvb_adapter, &ca->dvbdev, &dvbdev_ca, ca, DVB_DEVICE_CA);
1658 if (ret)
1659 goto error;
1660
1661 /* now initialise each slot */
1662 for (i = 0; i < slot_count; i++) {
1663 memset(&ca->slot_info[i], 0, sizeof(struct dvb_ca_slot));
1664 ca->slot_info[i].slot_state = DVB_CA_SLOTSTATE_NONE;
1665 atomic_set(&ca->slot_info[i].camchange_count, 0);
1666 ca->slot_info[i].camchange_type = DVB_CA_EN50221_CAMCHANGE_REMOVED;
1667 }
1668
1669 if (signal_pending(current)) {
1670 ret = -EINTR;
1671 goto error;
1672 }
1673 mb();
1674
1675 /* create a kthread for monitoring this CA device */
1676 ca->thread = kthread_run(dvb_ca_en50221_thread, ca, "kdvb-ca-%i:%i",
1677 ca->dvbdev->adapter->num, ca->dvbdev->id);
1678 if (IS_ERR(ca->thread)) {
1679 ret = PTR_ERR(ca->thread);
1680 printk("dvb_ca_init: failed to start kernel_thread (%d)\n",
1681 ret);
1682 goto error;
1683 }
1684 return 0;
1685
1686 error:
1687 if (ca != NULL) {
1688 if (ca->dvbdev != NULL)
1689 dvb_unregister_device(ca->dvbdev);
1690 kfree(ca->slot_info);
1691 kfree(ca);
1692 }
1693 pubca->private = NULL;
1694 return ret;
1695 }
1696 EXPORT_SYMBOL(dvb_ca_en50221_release);
1697
1698
1699
1700 /**
1701 * Release a DVB CA EN50221 interface device.
1702 *
1703 * @param ca_dev The dvb_device_t instance for the CA device.
1704 * @param ca The associated dvb_ca instance.
1705 */
1706 void dvb_ca_en50221_release(struct dvb_ca_en50221 *pubca)
1707 {
1708 struct dvb_ca_private *ca = pubca->private;
1709 int i;
1710
1711 dprintk("%s\n", __func__);
1712
1713 /* shutdown the thread if there was one */
1714 kthread_stop(ca->thread);
1715
1716 for (i = 0; i < ca->slot_count; i++) {
1717 dvb_ca_en50221_slot_shutdown(ca, i);
1718 vfree(ca->slot_info[i].rx_buffer.data);
1719 }
1720 kfree(ca->slot_info);
1721 dvb_unregister_device(ca->dvbdev);
1722 kfree(ca);
1723 pubca->private = NULL;
1724 }
AMDTP streaming driver for the Linux FireWire stack (Juju)