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PM / sleep: Asynchronous threads for suspend_noirq
[linux/fpc-iii.git] / drivers / media / dvb-core / dvb_ca_en50221.c
blob0aac3096728ee1faafa49a2ca8ad0986d18b0158
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 /* mutex used for serializing access to one CI slot */
97 struct mutex slot_lock;
98
99 /* Number of CAMCHANGES that have occurred since last processing */
100 atomic_t camchange_count;
101
102 /* Type of last CAMCHANGE */
103 int camchange_type;
104
105 /* base address of CAM config */
106 u32 config_base;
107
108 /* value to write into Config Control register */
109 u8 config_option;
110
111 /* if 1, the CAM supports DA IRQs */
112 u8 da_irq_supported:1;
113
114 /* size of the buffer to use when talking to the CAM */
115 int link_buf_size;
116
117 /* buffer for incoming packets */
118 struct dvb_ringbuffer rx_buffer;
119
120 /* timer used during various states of the slot */
121 unsigned long timeout;
122 };
123
124 /* Private CA-interface information */
125 struct dvb_ca_private {
126
127 /* pointer back to the public data structure */
128 struct dvb_ca_en50221 *pub;
129
130 /* the DVB device */
131 struct dvb_device *dvbdev;
132
133 /* Flags describing the interface (DVB_CA_FLAG_*) */
134 u32 flags;
135
136 /* number of slots supported by this CA interface */
137 unsigned int slot_count;
138
139 /* information on each slot */
140 struct dvb_ca_slot *slot_info;
141
142 /* wait queues for read() and write() operations */
143 wait_queue_head_t wait_queue;
144
145 /* PID of the monitoring thread */
146 struct task_struct *thread;
147
148 /* Flag indicating if the CA device is open */
149 unsigned int open:1;
150
151 /* Flag indicating the thread should wake up now */
152 unsigned int wakeup:1;
153
154 /* Delay the main thread should use */
155 unsigned long delay;
156
157 /* Slot to start looking for data to read from in the next user-space read operation */
158 int next_read_slot;
159
160 /* mutex serializing ioctls */
161 struct mutex ioctl_mutex;
162 };
163
164 static void dvb_ca_en50221_thread_wakeup(struct dvb_ca_private *ca);
165 static int dvb_ca_en50221_read_data(struct dvb_ca_private *ca, int slot, u8 * ebuf, int ecount);
166 static int dvb_ca_en50221_write_data(struct dvb_ca_private *ca, int slot, u8 * ebuf, int ecount);
167
168
169 /**
170 * Safely find needle in haystack.
171 *
172 * @param haystack Buffer to look in.
173 * @param hlen Number of bytes in haystack.
174 * @param needle Buffer to find.
175 * @param nlen Number of bytes in needle.
176 * @return Pointer into haystack needle was found at, or NULL if not found.
177 */
178 static char *findstr(char * haystack, int hlen, char * needle, int nlen)
179 {
180 int i;
181
182 if (hlen < nlen)
183 return NULL;
184
185 for (i = 0; i <= hlen - nlen; i++) {
186 if (!strncmp(haystack + i, needle, nlen))
187 return haystack + i;
188 }
189
190 return NULL;
191 }
192
193
194
195 /* ******************************************************************************** */
196 /* EN50221 physical interface functions */
197
198
199 /**
200 * Check CAM status.
201 */
202 static int dvb_ca_en50221_check_camstatus(struct dvb_ca_private *ca, int slot)
203 {
204 int slot_status;
205 int cam_present_now;
206 int cam_changed;
207
208 /* IRQ mode */
209 if (ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE) {
210 return (atomic_read(&ca->slot_info[slot].camchange_count) != 0);
211 }
212
213 /* poll mode */
214 slot_status = ca->pub->poll_slot_status(ca->pub, slot, ca->open);
215
216 cam_present_now = (slot_status & DVB_CA_EN50221_POLL_CAM_PRESENT) ? 1 : 0;
217 cam_changed = (slot_status & DVB_CA_EN50221_POLL_CAM_CHANGED) ? 1 : 0;
218 if (!cam_changed) {
219 int cam_present_old = (ca->slot_info[slot].slot_state != DVB_CA_SLOTSTATE_NONE);
220 cam_changed = (cam_present_now != cam_present_old);
221 }
222
223 if (cam_changed) {
224 if (!cam_present_now) {
225 ca->slot_info[slot].camchange_type = DVB_CA_EN50221_CAMCHANGE_REMOVED;
226 } else {
227 ca->slot_info[slot].camchange_type = DVB_CA_EN50221_CAMCHANGE_INSERTED;
228 }
229 atomic_set(&ca->slot_info[slot].camchange_count, 1);
230 } else {
231 if ((ca->slot_info[slot].slot_state == DVB_CA_SLOTSTATE_WAITREADY) &&
232 (slot_status & DVB_CA_EN50221_POLL_CAM_READY)) {
233 // move to validate state if reset is completed
234 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_VALIDATE;
235 }
236 }
237
238 return cam_changed;
239 }
240
241
242 /**
243 * Wait for flags to become set on the STATUS register on a CAM interface,
244 * checking for errors and timeout.
245 *
246 * @param ca CA instance.
247 * @param slot Slot on interface.
248 * @param waitfor Flags to wait for.
249 * @param timeout_ms Timeout in milliseconds.
250 *
251 * @return 0 on success, nonzero on error.
252 */
253 static int dvb_ca_en50221_wait_if_status(struct dvb_ca_private *ca, int slot,
254 u8 waitfor, int timeout_hz)
255 {
256 unsigned long timeout;
257 unsigned long start;
258
259 dprintk("%s\n", __func__);
260
261 /* loop until timeout elapsed */
262 start = jiffies;
263 timeout = jiffies + timeout_hz;
264 while (1) {
265 /* read the status and check for error */
266 int res = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS);
267 if (res < 0)
268 return -EIO;
269
270 /* if we got the flags, it was successful! */
271 if (res & waitfor) {
272 dprintk("%s succeeded timeout:%lu\n", __func__, jiffies - start);
273 return 0;
274 }
275
276 /* check for timeout */
277 if (time_after(jiffies, timeout)) {
278 break;
279 }
280
281 /* wait for a bit */
282 msleep(1);
283 }
284
285 dprintk("%s failed timeout:%lu\n", __func__, jiffies - start);
286
287 /* if we get here, we've timed out */
288 return -ETIMEDOUT;
289 }
290
291
292 /**
293 * Initialise the link layer connection to a CAM.
294 *
295 * @param ca CA instance.
296 * @param slot Slot id.
297 *
298 * @return 0 on success, nonzero on failure.
299 */
300 static int dvb_ca_en50221_link_init(struct dvb_ca_private *ca, int slot)
301 {
302 int ret;
303 int buf_size;
304 u8 buf[2];
305
306 dprintk("%s\n", __func__);
307
308 /* we'll be determining these during this function */
309 ca->slot_info[slot].da_irq_supported = 0;
310
311 /* set the host link buffer size temporarily. it will be overwritten with the
312 * real negotiated size later. */
313 ca->slot_info[slot].link_buf_size = 2;
314
315 /* read the buffer size from the CAM */
316 if ((ret = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, IRQEN | CMDREG_SR)) != 0)
317 return ret;
318 if ((ret = dvb_ca_en50221_wait_if_status(ca, slot, STATUSREG_DA, HZ / 10)) != 0)
319 return ret;
320 if ((ret = dvb_ca_en50221_read_data(ca, slot, buf, 2)) != 2)
321 return -EIO;
322 if ((ret = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, IRQEN)) != 0)
323 return ret;
324
325 /* store it, and choose the minimum of our buffer and the CAM's buffer size */
326 buf_size = (buf[0] << 8) | buf[1];
327 if (buf_size > HOST_LINK_BUF_SIZE)
328 buf_size = HOST_LINK_BUF_SIZE;
329 ca->slot_info[slot].link_buf_size = buf_size;
330 buf[0] = buf_size >> 8;
331 buf[1] = buf_size & 0xff;
332 dprintk("Chosen link buffer size of %i\n", buf_size);
333
334 /* write the buffer size to the CAM */
335 if ((ret = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, IRQEN | CMDREG_SW)) != 0)
336 return ret;
337 if ((ret = dvb_ca_en50221_wait_if_status(ca, slot, STATUSREG_FR, HZ / 10)) != 0)
338 return ret;
339 if ((ret = dvb_ca_en50221_write_data(ca, slot, buf, 2)) != 2)
340 return -EIO;
341 if ((ret = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, IRQEN)) != 0)
342 return ret;
343
344 /* success */
345 return 0;
346 }
347
348 /**
349 * Read a tuple from attribute memory.
350 *
351 * @param ca CA instance.
352 * @param slot Slot id.
353 * @param address Address to read from. Updated.
354 * @param tupleType Tuple id byte. Updated.
355 * @param tupleLength Tuple length. Updated.
356 * @param tuple Dest buffer for tuple (must be 256 bytes). Updated.
357 *
358 * @return 0 on success, nonzero on error.
359 */
360 static int dvb_ca_en50221_read_tuple(struct dvb_ca_private *ca, int slot,
361 int *address, int *tupleType, int *tupleLength, u8 * tuple)
362 {
363 int i;
364 int _tupleType;
365 int _tupleLength;
366 int _address = *address;
367
368 /* grab the next tuple length and type */
369 if ((_tupleType = ca->pub->read_attribute_mem(ca->pub, slot, _address)) < 0)
370 return _tupleType;
371 if (_tupleType == 0xff) {
372 dprintk("END OF CHAIN TUPLE type:0x%x\n", _tupleType);
373 *address += 2;
374 *tupleType = _tupleType;
375 *tupleLength = 0;
376 return 0;
377 }
378 if ((_tupleLength = ca->pub->read_attribute_mem(ca->pub, slot, _address + 2)) < 0)
379 return _tupleLength;
380 _address += 4;
381
382 dprintk("TUPLE type:0x%x length:%i\n", _tupleType, _tupleLength);
383
384 /* read in the whole tuple */
385 for (i = 0; i < _tupleLength; i++) {
386 tuple[i] = ca->pub->read_attribute_mem(ca->pub, slot, _address + (i * 2));
387 dprintk(" 0x%02x: 0x%02x %c\n",
388 i, tuple[i] & 0xff,
389 ((tuple[i] > 31) && (tuple[i] < 127)) ? tuple[i] : '.');
390 }
391 _address += (_tupleLength * 2);
392
393 // success
394 *tupleType = _tupleType;
395 *tupleLength = _tupleLength;
396 *address = _address;
397 return 0;
398 }
399
400
401 /**
402 * Parse attribute memory of a CAM module, extracting Config register, and checking
403 * it is a DVB CAM module.
404 *
405 * @param ca CA instance.
406 * @param slot Slot id.
407 *
408 * @return 0 on success, <0 on failure.
409 */
410 static int dvb_ca_en50221_parse_attributes(struct dvb_ca_private *ca, int slot)
411 {
412 int address = 0;
413 int tupleLength;
414 int tupleType;
415 u8 tuple[257];
416 char *dvb_str;
417 int rasz;
418 int status;
419 int got_cftableentry = 0;
420 int end_chain = 0;
421 int i;
422 u16 manfid = 0;
423 u16 devid = 0;
424
425
426 // CISTPL_DEVICE_0A
427 if ((status =
428 dvb_ca_en50221_read_tuple(ca, slot, &address, &tupleType, &tupleLength, tuple)) < 0)
429 return status;
430 if (tupleType != 0x1D)
431 return -EINVAL;
432
433
434
435 // CISTPL_DEVICE_0C
436 if ((status =
437 dvb_ca_en50221_read_tuple(ca, slot, &address, &tupleType, &tupleLength, tuple)) < 0)
438 return status;
439 if (tupleType != 0x1C)
440 return -EINVAL;
441
442
443
444 // CISTPL_VERS_1
445 if ((status =
446 dvb_ca_en50221_read_tuple(ca, slot, &address, &tupleType, &tupleLength, tuple)) < 0)
447 return status;
448 if (tupleType != 0x15)
449 return -EINVAL;
450
451
452
453 // CISTPL_MANFID
454 if ((status = dvb_ca_en50221_read_tuple(ca, slot, &address, &tupleType,
455 &tupleLength, tuple)) < 0)
456 return status;
457 if (tupleType != 0x20)
458 return -EINVAL;
459 if (tupleLength != 4)
460 return -EINVAL;
461 manfid = (tuple[1] << 8) | tuple[0];
462 devid = (tuple[3] << 8) | tuple[2];
463
464
465
466 // CISTPL_CONFIG
467 if ((status = dvb_ca_en50221_read_tuple(ca, slot, &address, &tupleType,
468 &tupleLength, tuple)) < 0)
469 return status;
470 if (tupleType != 0x1A)
471 return -EINVAL;
472 if (tupleLength < 3)
473 return -EINVAL;
474
475 /* extract the configbase */
476 rasz = tuple[0] & 3;
477 if (tupleLength < (3 + rasz + 14))
478 return -EINVAL;
479 ca->slot_info[slot].config_base = 0;
480 for (i = 0; i < rasz + 1; i++) {
481 ca->slot_info[slot].config_base |= (tuple[2 + i] << (8 * i));
482 }
483
484 /* check it contains the correct DVB string */
485 dvb_str = findstr((char *)tuple, tupleLength, "DVB_CI_V", 8);
486 if (dvb_str == NULL)
487 return -EINVAL;
488 if (tupleLength < ((dvb_str - (char *) tuple) + 12))
489 return -EINVAL;
490
491 /* is it a version we support? */
492 if (strncmp(dvb_str + 8, "1.00", 4)) {
493 printk("dvb_ca adapter %d: Unsupported DVB CAM module version %c%c%c%c\n",
494 ca->dvbdev->adapter->num, dvb_str[8], dvb_str[9], dvb_str[10], dvb_str[11]);
495 return -EINVAL;
496 }
497
498 /* process the CFTABLE_ENTRY tuples, and any after those */
499 while ((!end_chain) && (address < 0x1000)) {
500 if ((status = dvb_ca_en50221_read_tuple(ca, slot, &address, &tupleType,
501 &tupleLength, tuple)) < 0)
502 return status;
503 switch (tupleType) {
504 case 0x1B: // CISTPL_CFTABLE_ENTRY
505 if (tupleLength < (2 + 11 + 17))
506 break;
507
508 /* if we've already parsed one, just use it */
509 if (got_cftableentry)
510 break;
511
512 /* get the config option */
513 ca->slot_info[slot].config_option = tuple[0] & 0x3f;
514
515 /* OK, check it contains the correct strings */
516 if ((findstr((char *)tuple, tupleLength, "DVB_HOST", 8) == NULL) ||
517 (findstr((char *)tuple, tupleLength, "DVB_CI_MODULE", 13) == NULL))
518 break;
519
520 got_cftableentry = 1;
521 break;
522
523 case 0x14: // CISTPL_NO_LINK
524 break;
525
526 case 0xFF: // CISTPL_END
527 end_chain = 1;
528 break;
529
530 default: /* Unknown tuple type - just skip this tuple and move to the next one */
531 dprintk("dvb_ca: Skipping unknown tuple type:0x%x length:0x%x\n", tupleType,
532 tupleLength);
533 break;
534 }
535 }
536
537 if ((address > 0x1000) || (!got_cftableentry))
538 return -EINVAL;
539
540 dprintk("Valid DVB CAM detected MANID:%x DEVID:%x CONFIGBASE:0x%x CONFIGOPTION:0x%x\n",
541 manfid, devid, ca->slot_info[slot].config_base, ca->slot_info[slot].config_option);
542
543 // success!
544 return 0;
545 }
546
547
548 /**
549 * Set CAM's configoption correctly.
550 *
551 * @param ca CA instance.
552 * @param slot Slot containing the CAM.
553 */
554 static int dvb_ca_en50221_set_configoption(struct dvb_ca_private *ca, int slot)
555 {
556 int configoption;
557
558 dprintk("%s\n", __func__);
559
560 /* set the config option */
561 ca->pub->write_attribute_mem(ca->pub, slot,
562 ca->slot_info[slot].config_base,
563 ca->slot_info[slot].config_option);
564
565 /* check it */
566 configoption = ca->pub->read_attribute_mem(ca->pub, slot, ca->slot_info[slot].config_base);
567 dprintk("Set configoption 0x%x, read configoption 0x%x\n",
568 ca->slot_info[slot].config_option, configoption & 0x3f);
569
570 /* fine! */
571 return 0;
572
573 }
574
575
576 /**
577 * This function talks to an EN50221 CAM control interface. It reads a buffer of
578 * data from the CAM. The data can either be stored in a supplied buffer, or
579 * automatically be added to the slot's rx_buffer.
580 *
581 * @param ca CA instance.
582 * @param slot Slot to read from.
583 * @param ebuf If non-NULL, the data will be written to this buffer. If NULL,
584 * the data will be added into the buffering system as a normal fragment.
585 * @param ecount Size of ebuf. Ignored if ebuf is NULL.
586 *
587 * @return Number of bytes read, or < 0 on error
588 */
589 static int dvb_ca_en50221_read_data(struct dvb_ca_private *ca, int slot, u8 * ebuf, int ecount)
590 {
591 int bytes_read;
592 int status;
593 u8 buf[HOST_LINK_BUF_SIZE];
594 int i;
595
596 dprintk("%s\n", __func__);
597
598 /* check if we have space for a link buf in the rx_buffer */
599 if (ebuf == NULL) {
600 int buf_free;
601
602 if (ca->slot_info[slot].rx_buffer.data == NULL) {
603 status = -EIO;
604 goto exit;
605 }
606 buf_free = dvb_ringbuffer_free(&ca->slot_info[slot].rx_buffer);
607
608 if (buf_free < (ca->slot_info[slot].link_buf_size + DVB_RINGBUFFER_PKTHDRSIZE)) {
609 status = -EAGAIN;
610 goto exit;
611 }
612 }
613
614 /* check if there is data available */
615 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS)) < 0)
616 goto exit;
617 if (!(status & STATUSREG_DA)) {
618 /* no data */
619 status = 0;
620 goto exit;
621 }
622
623 /* read the amount of data */
624 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_SIZE_HIGH)) < 0)
625 goto exit;
626 bytes_read = status << 8;
627 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_SIZE_LOW)) < 0)
628 goto exit;
629 bytes_read |= status;
630
631 /* check it will fit */
632 if (ebuf == NULL) {
633 if (bytes_read > ca->slot_info[slot].link_buf_size) {
634 printk("dvb_ca adapter %d: CAM tried to send a buffer larger than the link buffer size (%i > %i)!\n",
635 ca->dvbdev->adapter->num, bytes_read, ca->slot_info[slot].link_buf_size);
636 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_LINKINIT;
637 status = -EIO;
638 goto exit;
639 }
640 if (bytes_read < 2) {
641 printk("dvb_ca adapter %d: CAM sent a buffer that was less than 2 bytes!\n",
642 ca->dvbdev->adapter->num);
643 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_LINKINIT;
644 status = -EIO;
645 goto exit;
646 }
647 } else {
648 if (bytes_read > ecount) {
649 printk("dvb_ca adapter %d: CAM tried to send a buffer larger than the ecount size!\n",
650 ca->dvbdev->adapter->num);
651 status = -EIO;
652 goto exit;
653 }
654 }
655
656 /* fill the buffer */
657 for (i = 0; i < bytes_read; i++) {
658 /* read byte and check */
659 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_DATA)) < 0)
660 goto exit;
661
662 /* OK, store it in the buffer */
663 buf[i] = status;
664 }
665
666 /* check for read error (RE should now be 0) */
667 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS)) < 0)
668 goto exit;
669 if (status & STATUSREG_RE) {
670 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_LINKINIT;
671 status = -EIO;
672 goto exit;
673 }
674
675 /* OK, add it to the receive buffer, or copy into external buffer if supplied */
676 if (ebuf == NULL) {
677 if (ca->slot_info[slot].rx_buffer.data == NULL) {
678 status = -EIO;
679 goto exit;
680 }
681 dvb_ringbuffer_pkt_write(&ca->slot_info[slot].rx_buffer, buf, bytes_read);
682 } else {
683 memcpy(ebuf, buf, bytes_read);
684 }
685
686 dprintk("Received CA packet for slot %i connection id 0x%x last_frag:%i size:0x%x\n", slot,
687 buf[0], (buf[1] & 0x80) == 0, bytes_read);
688
689 /* wake up readers when a last_fragment is received */
690 if ((buf[1] & 0x80) == 0x00) {
691 wake_up_interruptible(&ca->wait_queue);
692 }
693 status = bytes_read;
694
695 exit:
696 return status;
697 }
698
699
700 /**
701 * This function talks to an EN50221 CAM control interface. It writes a buffer of data
702 * to a CAM.
703 *
704 * @param ca CA instance.
705 * @param slot Slot to write to.
706 * @param ebuf The data in this buffer is treated as a complete link-level packet to
707 * be written.
708 * @param count Size of ebuf.
709 *
710 * @return Number of bytes written, or < 0 on error.
711 */
712 static int dvb_ca_en50221_write_data(struct dvb_ca_private *ca, int slot, u8 * buf, int bytes_write)
713 {
714 int status;
715 int i;
716
717 dprintk("%s\n", __func__);
718
719
720 /* sanity check */
721 if (bytes_write > ca->slot_info[slot].link_buf_size)
722 return -EINVAL;
723
724 /* it is possible we are dealing with a single buffer implementation,
725 thus if there is data available for read or if there is even a read
726 already in progress, we do nothing but awake the kernel thread to
727 process the data if necessary. */
728 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS)) < 0)
729 goto exitnowrite;
730 if (status & (STATUSREG_DA | STATUSREG_RE)) {
731 if (status & STATUSREG_DA)
732 dvb_ca_en50221_thread_wakeup(ca);
733
734 status = -EAGAIN;
735 goto exitnowrite;
736 }
737
738 /* OK, set HC bit */
739 if ((status = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND,
740 IRQEN | CMDREG_HC)) != 0)
741 goto exit;
742
743 /* check if interface is still free */
744 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS)) < 0)
745 goto exit;
746 if (!(status & STATUSREG_FR)) {
747 /* it wasn't free => try again later */
748 status = -EAGAIN;
749 goto exit;
750 }
751
752 /* send the amount of data */
753 if ((status = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_SIZE_HIGH, bytes_write >> 8)) != 0)
754 goto exit;
755 if ((status = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_SIZE_LOW,
756 bytes_write & 0xff)) != 0)
757 goto exit;
758
759 /* send the buffer */
760 for (i = 0; i < bytes_write; i++) {
761 if ((status = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_DATA, buf[i])) != 0)
762 goto exit;
763 }
764
765 /* check for write error (WE should now be 0) */
766 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS)) < 0)
767 goto exit;
768 if (status & STATUSREG_WE) {
769 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_LINKINIT;
770 status = -EIO;
771 goto exit;
772 }
773 status = bytes_write;
774
775 dprintk("Wrote CA packet for slot %i, connection id 0x%x last_frag:%i size:0x%x\n", slot,
776 buf[0], (buf[1] & 0x80) == 0, bytes_write);
777
778 exit:
779 ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, IRQEN);
780
781 exitnowrite:
782 return status;
783 }
784 EXPORT_SYMBOL(dvb_ca_en50221_camchange_irq);
785
786
787
788 /* ******************************************************************************** */
789 /* EN50221 higher level functions */
790
791
792 /**
793 * A CAM has been removed => shut it down.
794 *
795 * @param ca CA instance.
796 * @param slot Slot to shut down.
797 */
798 static int dvb_ca_en50221_slot_shutdown(struct dvb_ca_private *ca, int slot)
799 {
800 dprintk("%s\n", __func__);
801
802 ca->pub->slot_shutdown(ca->pub, slot);
803 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_NONE;
804
805 /* need to wake up all processes to check if they're now
806 trying to write to a defunct CAM */
807 wake_up_interruptible(&ca->wait_queue);
808
809 dprintk("Slot %i shutdown\n", slot);
810
811 /* success */
812 return 0;
813 }
814 EXPORT_SYMBOL(dvb_ca_en50221_camready_irq);
815
816
817 /**
818 * A CAMCHANGE IRQ has occurred.
819 *
820 * @param ca CA instance.
821 * @param slot Slot concerned.
822 * @param change_type One of the DVB_CA_CAMCHANGE_* values.
823 */
824 void dvb_ca_en50221_camchange_irq(struct dvb_ca_en50221 *pubca, int slot, int change_type)
825 {
826 struct dvb_ca_private *ca = pubca->private;
827
828 dprintk("CAMCHANGE IRQ slot:%i change_type:%i\n", slot, change_type);
829
830 switch (change_type) {
831 case DVB_CA_EN50221_CAMCHANGE_REMOVED:
832 case DVB_CA_EN50221_CAMCHANGE_INSERTED:
833 break;
834
835 default:
836 return;
837 }
838
839 ca->slot_info[slot].camchange_type = change_type;
840 atomic_inc(&ca->slot_info[slot].camchange_count);
841 dvb_ca_en50221_thread_wakeup(ca);
842 }
843 EXPORT_SYMBOL(dvb_ca_en50221_frda_irq);
844
845
846 /**
847 * A CAMREADY IRQ has occurred.
848 *
849 * @param ca CA instance.
850 * @param slot Slot concerned.
851 */
852 void dvb_ca_en50221_camready_irq(struct dvb_ca_en50221 *pubca, int slot)
853 {
854 struct dvb_ca_private *ca = pubca->private;
855
856 dprintk("CAMREADY IRQ slot:%i\n", slot);
857
858 if (ca->slot_info[slot].slot_state == DVB_CA_SLOTSTATE_WAITREADY) {
859 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_VALIDATE;
860 dvb_ca_en50221_thread_wakeup(ca);
861 }
862 }
863
864
865 /**
866 * An FR or DA IRQ has occurred.
867 *
868 * @param ca CA instance.
869 * @param slot Slot concerned.
870 */
871 void dvb_ca_en50221_frda_irq(struct dvb_ca_en50221 *pubca, int slot)
872 {
873 struct dvb_ca_private *ca = pubca->private;
874 int flags;
875
876 dprintk("FR/DA IRQ slot:%i\n", slot);
877
878 switch (ca->slot_info[slot].slot_state) {
879 case DVB_CA_SLOTSTATE_LINKINIT:
880 flags = ca->pub->read_cam_control(pubca, slot, CTRLIF_STATUS);
881 if (flags & STATUSREG_DA) {
882 dprintk("CAM supports DA IRQ\n");
883 ca->slot_info[slot].da_irq_supported = 1;
884 }
885 break;
886
887 case DVB_CA_SLOTSTATE_RUNNING:
888 if (ca->open)
889 dvb_ca_en50221_thread_wakeup(ca);
890 break;
891 }
892 }
893
894
895
896 /* ******************************************************************************** */
897 /* EN50221 thread functions */
898
899 /**
900 * Wake up the DVB CA thread
901 *
902 * @param ca CA instance.
903 */
904 static void dvb_ca_en50221_thread_wakeup(struct dvb_ca_private *ca)
905 {
906
907 dprintk("%s\n", __func__);
908
909 ca->wakeup = 1;
910 mb();
911 wake_up_process(ca->thread);
912 }
913
914 /**
915 * Update the delay used by the thread.
916 *
917 * @param ca CA instance.
918 */
919 static void dvb_ca_en50221_thread_update_delay(struct dvb_ca_private *ca)
920 {
921 int delay;
922 int curdelay = 100000000;
923 int slot;
924
925 /* Beware of too high polling frequency, because one polling
926 * call might take several hundred milliseconds until timeout!
927 */
928 for (slot = 0; slot < ca->slot_count; slot++) {
929 switch (ca->slot_info[slot].slot_state) {
930 default:
931 case DVB_CA_SLOTSTATE_NONE:
932 delay = HZ * 60; /* 60s */
933 if (!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE))
934 delay = HZ * 5; /* 5s */
935 break;
936 case DVB_CA_SLOTSTATE_INVALID:
937 delay = HZ * 60; /* 60s */
938 if (!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE))
939 delay = HZ / 10; /* 100ms */
940 break;
941
942 case DVB_CA_SLOTSTATE_UNINITIALISED:
943 case DVB_CA_SLOTSTATE_WAITREADY:
944 case DVB_CA_SLOTSTATE_VALIDATE:
945 case DVB_CA_SLOTSTATE_WAITFR:
946 case DVB_CA_SLOTSTATE_LINKINIT:
947 delay = HZ / 10; /* 100ms */
948 break;
949
950 case DVB_CA_SLOTSTATE_RUNNING:
951 delay = HZ * 60; /* 60s */
952 if (!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE))
953 delay = HZ / 10; /* 100ms */
954 if (ca->open) {
955 if ((!ca->slot_info[slot].da_irq_supported) ||
956 (!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_DA)))
957 delay = HZ / 10; /* 100ms */
958 }
959 break;
960 }
961
962 if (delay < curdelay)
963 curdelay = delay;
964 }
965
966 ca->delay = curdelay;
967 }
968
969
970
971 /**
972 * Kernel thread which monitors CA slots for CAM changes, and performs data transfers.
973 */
974 static int dvb_ca_en50221_thread(void *data)
975 {
976 struct dvb_ca_private *ca = data;
977 int slot;
978 int flags;
979 int status;
980 int pktcount;
981 void *rxbuf;
982
983 dprintk("%s\n", __func__);
984
985 /* choose the correct initial delay */
986 dvb_ca_en50221_thread_update_delay(ca);
987
988 /* main loop */
989 while (!kthread_should_stop()) {
990 /* sleep for a bit */
991 if (!ca->wakeup) {
992 set_current_state(TASK_INTERRUPTIBLE);
993 schedule_timeout(ca->delay);
994 if (kthread_should_stop())
995 return 0;
996 }
997 ca->wakeup = 0;
998
999 /* go through all the slots processing them */
1000 for (slot = 0; slot < ca->slot_count; slot++) {
1001
1002 mutex_lock(&ca->slot_info[slot].slot_lock);
1003
1004 // check the cam status + deal with CAMCHANGEs
1005 while (dvb_ca_en50221_check_camstatus(ca, slot)) {
1006 /* clear down an old CI slot if necessary */
1007 if (ca->slot_info[slot].slot_state != DVB_CA_SLOTSTATE_NONE)
1008 dvb_ca_en50221_slot_shutdown(ca, slot);
1009
1010 /* if a CAM is NOW present, initialise it */
1011 if (ca->slot_info[slot].camchange_type == DVB_CA_EN50221_CAMCHANGE_INSERTED) {
1012 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_UNINITIALISED;
1013 }
1014
1015 /* we've handled one CAMCHANGE */
1016 dvb_ca_en50221_thread_update_delay(ca);
1017 atomic_dec(&ca->slot_info[slot].camchange_count);
1018 }
1019
1020 // CAM state machine
1021 switch (ca->slot_info[slot].slot_state) {
1022 case DVB_CA_SLOTSTATE_NONE:
1023 case DVB_CA_SLOTSTATE_INVALID:
1024 // no action needed
1025 break;
1026
1027 case DVB_CA_SLOTSTATE_UNINITIALISED:
1028 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_WAITREADY;
1029 ca->pub->slot_reset(ca->pub, slot);
1030 ca->slot_info[slot].timeout = jiffies + (INIT_TIMEOUT_SECS * HZ);
1031 break;
1032
1033 case DVB_CA_SLOTSTATE_WAITREADY:
1034 if (time_after(jiffies, ca->slot_info[slot].timeout)) {
1035 printk("dvb_ca adaptor %d: PC card did not respond :(\n",
1036 ca->dvbdev->adapter->num);
1037 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID;
1038 dvb_ca_en50221_thread_update_delay(ca);
1039 break;
1040 }
1041 // no other action needed; will automatically change state when ready
1042 break;
1043
1044 case DVB_CA_SLOTSTATE_VALIDATE:
1045 if (dvb_ca_en50221_parse_attributes(ca, slot) != 0) {
1046 /* we need this extra check for annoying interfaces like the budget-av */
1047 if ((!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE)) &&
1048 (ca->pub->poll_slot_status)) {
1049 status = ca->pub->poll_slot_status(ca->pub, slot, 0);
1050 if (!(status & DVB_CA_EN50221_POLL_CAM_PRESENT)) {
1051 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_NONE;
1052 dvb_ca_en50221_thread_update_delay(ca);
1053 break;
1054 }
1055 }
1056
1057 printk("dvb_ca adapter %d: Invalid PC card inserted :(\n",
1058 ca->dvbdev->adapter->num);
1059 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID;
1060 dvb_ca_en50221_thread_update_delay(ca);
1061 break;
1062 }
1063 if (dvb_ca_en50221_set_configoption(ca, slot) != 0) {
1064 printk("dvb_ca adapter %d: Unable to initialise CAM :(\n",
1065 ca->dvbdev->adapter->num);
1066 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID;
1067 dvb_ca_en50221_thread_update_delay(ca);
1068 break;
1069 }
1070 if (ca->pub->write_cam_control(ca->pub, slot,
1071 CTRLIF_COMMAND, CMDREG_RS) != 0) {
1072 printk("dvb_ca adapter %d: Unable to reset CAM IF\n",
1073 ca->dvbdev->adapter->num);
1074 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID;
1075 dvb_ca_en50221_thread_update_delay(ca);
1076 break;
1077 }
1078 dprintk("DVB CAM validated successfully\n");
1079
1080 ca->slot_info[slot].timeout = jiffies + (INIT_TIMEOUT_SECS * HZ);
1081 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_WAITFR;
1082 ca->wakeup = 1;
1083 break;
1084
1085 case DVB_CA_SLOTSTATE_WAITFR:
1086 if (time_after(jiffies, ca->slot_info[slot].timeout)) {
1087 printk("dvb_ca adapter %d: DVB CAM did not respond :(\n",
1088 ca->dvbdev->adapter->num);
1089 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID;
1090 dvb_ca_en50221_thread_update_delay(ca);
1091 break;
1092 }
1093
1094 flags = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS);
1095 if (flags & STATUSREG_FR) {
1096 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_LINKINIT;
1097 ca->wakeup = 1;
1098 }
1099 break;
1100
1101 case DVB_CA_SLOTSTATE_LINKINIT:
1102 if (dvb_ca_en50221_link_init(ca, slot) != 0) {
1103 /* we need this extra check for annoying interfaces like the budget-av */
1104 if ((!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE)) &&
1105 (ca->pub->poll_slot_status)) {
1106 status = ca->pub->poll_slot_status(ca->pub, slot, 0);
1107 if (!(status & DVB_CA_EN50221_POLL_CAM_PRESENT)) {
1108 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_NONE;
1109 dvb_ca_en50221_thread_update_delay(ca);
1110 break;
1111 }
1112 }
1113
1114 printk("dvb_ca adapter %d: DVB CAM link initialisation failed :(\n", ca->dvbdev->adapter->num);
1115 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID;
1116 dvb_ca_en50221_thread_update_delay(ca);
1117 break;
1118 }
1119
1120 if (ca->slot_info[slot].rx_buffer.data == NULL) {
1121 rxbuf = vmalloc(RX_BUFFER_SIZE);
1122 if (rxbuf == NULL) {
1123 printk("dvb_ca adapter %d: Unable to allocate CAM rx buffer :(\n", ca->dvbdev->adapter->num);
1124 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID;
1125 dvb_ca_en50221_thread_update_delay(ca);
1126 break;
1127 }
1128 dvb_ringbuffer_init(&ca->slot_info[slot].rx_buffer, rxbuf, RX_BUFFER_SIZE);
1129 }
1130
1131 ca->pub->slot_ts_enable(ca->pub, slot);
1132 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_RUNNING;
1133 dvb_ca_en50221_thread_update_delay(ca);
1134 printk("dvb_ca adapter %d: DVB CAM detected and initialised successfully\n", ca->dvbdev->adapter->num);
1135 break;
1136
1137 case DVB_CA_SLOTSTATE_RUNNING:
1138 if (!ca->open)
1139 break;
1140
1141 // poll slots for data
1142 pktcount = 0;
1143 while ((status = dvb_ca_en50221_read_data(ca, slot, NULL, 0)) > 0) {
1144 if (!ca->open)
1145 break;
1146
1147 /* if a CAMCHANGE occurred at some point, do not do any more processing of this slot */
1148 if (dvb_ca_en50221_check_camstatus(ca, slot)) {
1149 // we dont want to sleep on the next iteration so we can handle the cam change
1150 ca->wakeup = 1;
1151 break;
1152 }
1153
1154 /* check if we've hit our limit this time */
1155 if (++pktcount >= MAX_RX_PACKETS_PER_ITERATION) {
1156 // dont sleep; there is likely to be more data to read
1157 ca->wakeup = 1;
1158 break;
1159 }
1160 }
1161 break;
1162 }
1163
1164 mutex_unlock(&ca->slot_info[slot].slot_lock);
1165 }
1166 }
1167
1168 return 0;
1169 }
1170
1171
1172
1173 /* ******************************************************************************** */
1174 /* EN50221 IO interface functions */
1175
1176 /**
1177 * Real ioctl implementation.
1178 * NOTE: CA_SEND_MSG/CA_GET_MSG ioctls have userspace buffers passed to them.
1179 *
1180 * @param inode Inode concerned.
1181 * @param file File concerned.
1182 * @param cmd IOCTL command.
1183 * @param arg Associated argument.
1184 *
1185 * @return 0 on success, <0 on error.
1186 */
1187 static int dvb_ca_en50221_io_do_ioctl(struct file *file,
1188 unsigned int cmd, void *parg)
1189 {
1190 struct dvb_device *dvbdev = file->private_data;
1191 struct dvb_ca_private *ca = dvbdev->priv;
1192 int err = 0;
1193 int slot;
1194
1195 dprintk("%s\n", __func__);
1196
1197 if (mutex_lock_interruptible(&ca->ioctl_mutex))
1198 return -ERESTARTSYS;
1199
1200 switch (cmd) {
1201 case CA_RESET:
1202 for (slot = 0; slot < ca->slot_count; slot++) {
1203 mutex_lock(&ca->slot_info[slot].slot_lock);
1204 if (ca->slot_info[slot].slot_state != DVB_CA_SLOTSTATE_NONE) {
1205 dvb_ca_en50221_slot_shutdown(ca, slot);
1206 if (ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE)
1207 dvb_ca_en50221_camchange_irq(ca->pub,
1208 slot,
1209 DVB_CA_EN50221_CAMCHANGE_INSERTED);
1210 }
1211 mutex_unlock(&ca->slot_info[slot].slot_lock);
1212 }
1213 ca->next_read_slot = 0;
1214 dvb_ca_en50221_thread_wakeup(ca);
1215 break;
1216
1217 case CA_GET_CAP: {
1218 struct ca_caps *caps = parg;
1219
1220 caps->slot_num = ca->slot_count;
1221 caps->slot_type = CA_CI_LINK;
1222 caps->descr_num = 0;
1223 caps->descr_type = 0;
1224 break;
1225 }
1226
1227 case CA_GET_SLOT_INFO: {
1228 struct ca_slot_info *info = parg;
1229
1230 if ((info->num > ca->slot_count) || (info->num < 0)) {
1231 err = -EINVAL;
1232 goto out_unlock;
1233 }
1234
1235 info->type = CA_CI_LINK;
1236 info->flags = 0;
1237 if ((ca->slot_info[info->num].slot_state != DVB_CA_SLOTSTATE_NONE)
1238 && (ca->slot_info[info->num].slot_state != DVB_CA_SLOTSTATE_INVALID)) {
1239 info->flags = CA_CI_MODULE_PRESENT;
1240 }
1241 if (ca->slot_info[info->num].slot_state == DVB_CA_SLOTSTATE_RUNNING) {
1242 info->flags |= CA_CI_MODULE_READY;
1243 }
1244 break;
1245 }
1246
1247 default:
1248 err = -EINVAL;
1249 break;
1250 }
1251
1252 out_unlock:
1253 mutex_unlock(&ca->ioctl_mutex);
1254 return err;
1255 }
1256
1257
1258 /**
1259 * Wrapper for ioctl implementation.
1260 *
1261 * @param inode Inode concerned.
1262 * @param file File concerned.
1263 * @param cmd IOCTL command.
1264 * @param arg Associated argument.
1265 *
1266 * @return 0 on success, <0 on error.
1267 */
1268 static long dvb_ca_en50221_io_ioctl(struct file *file,
1269 unsigned int cmd, unsigned long arg)
1270 {
1271 return dvb_usercopy(file, cmd, arg, dvb_ca_en50221_io_do_ioctl);
1272 }
1273
1274
1275 /**
1276 * Implementation of write() syscall.
1277 *
1278 * @param file File structure.
1279 * @param buf Source buffer.
1280 * @param count Size of source buffer.
1281 * @param ppos Position in file (ignored).
1282 *
1283 * @return Number of bytes read, or <0 on error.
1284 */
1285 static ssize_t dvb_ca_en50221_io_write(struct file *file,
1286 const char __user * buf, size_t count, loff_t * ppos)
1287 {
1288 struct dvb_device *dvbdev = file->private_data;
1289 struct dvb_ca_private *ca = dvbdev->priv;
1290 u8 slot, connection_id;
1291 int status;
1292 u8 fragbuf[HOST_LINK_BUF_SIZE];
1293 int fragpos = 0;
1294 int fraglen;
1295 unsigned long timeout;
1296 int written;
1297
1298 dprintk("%s\n", __func__);
1299
1300 /* Incoming packet has a 2 byte header. hdr[0] = slot_id, hdr[1] = connection_id */
1301 if (count < 2)
1302 return -EINVAL;
1303
1304 /* extract slot & connection id */
1305 if (copy_from_user(&slot, buf, 1))
1306 return -EFAULT;
1307 if (copy_from_user(&connection_id, buf + 1, 1))
1308 return -EFAULT;
1309 buf += 2;
1310 count -= 2;
1311
1312 /* check if the slot is actually running */
1313 if (ca->slot_info[slot].slot_state != DVB_CA_SLOTSTATE_RUNNING)
1314 return -EINVAL;
1315
1316 /* fragment the packets & store in the buffer */
1317 while (fragpos < count) {
1318 fraglen = ca->slot_info[slot].link_buf_size - 2;
1319 if (fraglen < 0)
1320 break;
1321 if (fraglen > HOST_LINK_BUF_SIZE - 2)
1322 fraglen = HOST_LINK_BUF_SIZE - 2;
1323 if ((count - fragpos) < fraglen)
1324 fraglen = count - fragpos;
1325
1326 fragbuf[0] = connection_id;
1327 fragbuf[1] = ((fragpos + fraglen) < count) ? 0x80 : 0x00;
1328 status = copy_from_user(fragbuf + 2, buf + fragpos, fraglen);
1329 if (status) {
1330 status = -EFAULT;
1331 goto exit;
1332 }
1333
1334 timeout = jiffies + HZ / 2;
1335 written = 0;
1336 while (!time_after(jiffies, timeout)) {
1337 /* check the CAM hasn't been removed/reset in the meantime */
1338 if (ca->slot_info[slot].slot_state != DVB_CA_SLOTSTATE_RUNNING) {
1339 status = -EIO;
1340 goto exit;
1341 }
1342
1343 mutex_lock(&ca->slot_info[slot].slot_lock);
1344 status = dvb_ca_en50221_write_data(ca, slot, fragbuf, fraglen + 2);
1345 mutex_unlock(&ca->slot_info[slot].slot_lock);
1346 if (status == (fraglen + 2)) {
1347 written = 1;
1348 break;
1349 }
1350 if (status != -EAGAIN)
1351 goto exit;
1352
1353 msleep(1);
1354 }
1355 if (!written) {
1356 status = -EIO;
1357 goto exit;
1358 }
1359
1360 fragpos += fraglen;
1361 }
1362 status = count + 2;
1363
1364 exit:
1365 return status;
1366 }
1367
1368
1369 /**
1370 * Condition for waking up in dvb_ca_en50221_io_read_condition
1371 */
1372 static int dvb_ca_en50221_io_read_condition(struct dvb_ca_private *ca,
1373 int *result, int *_slot)
1374 {
1375 int slot;
1376 int slot_count = 0;
1377 int idx;
1378 size_t fraglen;
1379 int connection_id = -1;
1380 int found = 0;
1381 u8 hdr[2];
1382
1383 slot = ca->next_read_slot;
1384 while ((slot_count < ca->slot_count) && (!found)) {
1385 if (ca->slot_info[slot].slot_state != DVB_CA_SLOTSTATE_RUNNING)
1386 goto nextslot;
1387
1388 if (ca->slot_info[slot].rx_buffer.data == NULL) {
1389 return 0;
1390 }
1391
1392 idx = dvb_ringbuffer_pkt_next(&ca->slot_info[slot].rx_buffer, -1, &fraglen);
1393 while (idx != -1) {
1394 dvb_ringbuffer_pkt_read(&ca->slot_info[slot].rx_buffer, idx, 0, hdr, 2);
1395 if (connection_id == -1)
1396 connection_id = hdr[0];
1397 if ((hdr[0] == connection_id) && ((hdr[1] & 0x80) == 0)) {
1398 *_slot = slot;
1399 found = 1;
1400 break;
1401 }
1402
1403 idx = dvb_ringbuffer_pkt_next(&ca->slot_info[slot].rx_buffer, idx, &fraglen);
1404 }
1405
1406 nextslot:
1407 slot = (slot + 1) % ca->slot_count;
1408 slot_count++;
1409 }
1410
1411 ca->next_read_slot = slot;
1412 return found;
1413 }
1414
1415
1416 /**
1417 * Implementation of read() syscall.
1418 *
1419 * @param file File structure.
1420 * @param buf Destination buffer.
1421 * @param count Size of destination buffer.
1422 * @param ppos Position in file (ignored).
1423 *
1424 * @return Number of bytes read, or <0 on error.
1425 */
1426 static ssize_t dvb_ca_en50221_io_read(struct file *file, char __user * buf,
1427 size_t count, loff_t * ppos)
1428 {
1429 struct dvb_device *dvbdev = file->private_data;
1430 struct dvb_ca_private *ca = dvbdev->priv;
1431 int status;
1432 int result = 0;
1433 u8 hdr[2];
1434 int slot;
1435 int connection_id = -1;
1436 size_t idx, idx2;
1437 int last_fragment = 0;
1438 size_t fraglen;
1439 int pktlen;
1440 int dispose = 0;
1441
1442 dprintk("%s\n", __func__);
1443
1444 /* Outgoing packet has a 2 byte header. hdr[0] = slot_id, hdr[1] = connection_id */
1445 if (count < 2)
1446 return -EINVAL;
1447
1448 /* wait for some data */
1449 if ((status = dvb_ca_en50221_io_read_condition(ca, &result, &slot)) == 0) {
1450
1451 /* if we're in nonblocking mode, exit immediately */
1452 if (file->f_flags & O_NONBLOCK)
1453 return -EWOULDBLOCK;
1454
1455 /* wait for some data */
1456 status = wait_event_interruptible(ca->wait_queue,
1457 dvb_ca_en50221_io_read_condition
1458 (ca, &result, &slot));
1459 }
1460 if ((status < 0) || (result < 0)) {
1461 if (result)
1462 return result;
1463 return status;
1464 }
1465
1466 idx = dvb_ringbuffer_pkt_next(&ca->slot_info[slot].rx_buffer, -1, &fraglen);
1467 pktlen = 2;
1468 do {
1469 if (idx == -1) {
1470 printk("dvb_ca adapter %d: BUG: read packet ended before last_fragment encountered\n", ca->dvbdev->adapter->num);
1471 status = -EIO;
1472 goto exit;
1473 }
1474
1475 dvb_ringbuffer_pkt_read(&ca->slot_info[slot].rx_buffer, idx, 0, hdr, 2);
1476 if (connection_id == -1)
1477 connection_id = hdr[0];
1478 if (hdr[0] == connection_id) {
1479 if (pktlen < count) {
1480 if ((pktlen + fraglen - 2) > count) {
1481 fraglen = count - pktlen;
1482 } else {
1483 fraglen -= 2;
1484 }
1485
1486 if ((status = dvb_ringbuffer_pkt_read_user(&ca->slot_info[slot].rx_buffer, idx, 2,
1487 buf + pktlen, fraglen)) < 0) {
1488 goto exit;
1489 }
1490 pktlen += fraglen;
1491 }
1492
1493 if ((hdr[1] & 0x80) == 0)
1494 last_fragment = 1;
1495 dispose = 1;
1496 }
1497
1498 idx2 = dvb_ringbuffer_pkt_next(&ca->slot_info[slot].rx_buffer, idx, &fraglen);
1499 if (dispose)
1500 dvb_ringbuffer_pkt_dispose(&ca->slot_info[slot].rx_buffer, idx);
1501 idx = idx2;
1502 dispose = 0;
1503 } while (!last_fragment);
1504
1505 hdr[0] = slot;
1506 hdr[1] = connection_id;
1507 status = copy_to_user(buf, hdr, 2);
1508 if (status) {
1509 status = -EFAULT;
1510 goto exit;
1511 }
1512 status = pktlen;
1513
1514 exit:
1515 return status;
1516 }
1517
1518
1519 /**
1520 * Implementation of file open syscall.
1521 *
1522 * @param inode Inode concerned.
1523 * @param file File concerned.
1524 *
1525 * @return 0 on success, <0 on failure.
1526 */
1527 static int dvb_ca_en50221_io_open(struct inode *inode, struct file *file)
1528 {
1529 struct dvb_device *dvbdev = file->private_data;
1530 struct dvb_ca_private *ca = dvbdev->priv;
1531 int err;
1532 int i;
1533
1534 dprintk("%s\n", __func__);
1535
1536 if (!try_module_get(ca->pub->owner))
1537 return -EIO;
1538
1539 err = dvb_generic_open(inode, file);
1540 if (err < 0) {
1541 module_put(ca->pub->owner);
1542 return err;
1543 }
1544
1545 for (i = 0; i < ca->slot_count; i++) {
1546
1547 if (ca->slot_info[i].slot_state == DVB_CA_SLOTSTATE_RUNNING) {
1548 if (ca->slot_info[i].rx_buffer.data != NULL) {
1549 /* it is safe to call this here without locks because
1550 * ca->open == 0. Data is not read in this case */
1551 dvb_ringbuffer_flush(&ca->slot_info[i].rx_buffer);
1552 }
1553 }
1554 }
1555
1556 ca->open = 1;
1557 dvb_ca_en50221_thread_update_delay(ca);
1558 dvb_ca_en50221_thread_wakeup(ca);
1559
1560 return 0;
1561 }
1562
1563
1564 /**
1565 * Implementation of file close syscall.
1566 *
1567 * @param inode Inode concerned.
1568 * @param file File concerned.
1569 *
1570 * @return 0 on success, <0 on failure.
1571 */
1572 static int dvb_ca_en50221_io_release(struct inode *inode, struct file *file)
1573 {
1574 struct dvb_device *dvbdev = file->private_data;
1575 struct dvb_ca_private *ca = dvbdev->priv;
1576 int err;
1577
1578 dprintk("%s\n", __func__);
1579
1580 /* mark the CA device as closed */
1581 ca->open = 0;
1582 dvb_ca_en50221_thread_update_delay(ca);
1583
1584 err = dvb_generic_release(inode, file);
1585
1586 module_put(ca->pub->owner);
1587
1588 return err;
1589 }
1590
1591
1592 /**
1593 * Implementation of poll() syscall.
1594 *
1595 * @param file File concerned.
1596 * @param wait poll wait table.
1597 *
1598 * @return Standard poll mask.
1599 */
1600 static unsigned int dvb_ca_en50221_io_poll(struct file *file, poll_table * wait)
1601 {
1602 struct dvb_device *dvbdev = file->private_data;
1603 struct dvb_ca_private *ca = dvbdev->priv;
1604 unsigned int mask = 0;
1605 int slot;
1606 int result = 0;
1607
1608 dprintk("%s\n", __func__);
1609
1610 if (dvb_ca_en50221_io_read_condition(ca, &result, &slot) == 1) {
1611 mask |= POLLIN;
1612 }
1613
1614 /* if there is something, return now */
1615 if (mask)
1616 return mask;
1617
1618 /* wait for something to happen */
1619 poll_wait(file, &ca->wait_queue, wait);
1620
1621 if (dvb_ca_en50221_io_read_condition(ca, &result, &slot) == 1) {
1622 mask |= POLLIN;
1623 }
1624
1625 return mask;
1626 }
1627 EXPORT_SYMBOL(dvb_ca_en50221_init);
1628
1629
1630 static const struct file_operations dvb_ca_fops = {
1631 .owner = THIS_MODULE,
1632 .read = dvb_ca_en50221_io_read,
1633 .write = dvb_ca_en50221_io_write,
1634 .unlocked_ioctl = dvb_ca_en50221_io_ioctl,
1635 .open = dvb_ca_en50221_io_open,
1636 .release = dvb_ca_en50221_io_release,
1637 .poll = dvb_ca_en50221_io_poll,
1638 .llseek = noop_llseek,
1639 };
1640
1641 static struct dvb_device dvbdev_ca = {
1642 .priv = NULL,
1643 .users = 1,
1644 .readers = 1,
1645 .writers = 1,
1646 .fops = &dvb_ca_fops,
1647 };
1648
1649
1650 /* ******************************************************************************** */
1651 /* Initialisation/shutdown functions */
1652
1653
1654 /**
1655 * Initialise a new DVB CA EN50221 interface device.
1656 *
1657 * @param dvb_adapter DVB adapter to attach the new CA device to.
1658 * @param ca The dvb_ca instance.
1659 * @param flags Flags describing the CA device (DVB_CA_FLAG_*).
1660 * @param slot_count Number of slots supported.
1661 *
1662 * @return 0 on success, nonzero on failure
1663 */
1664 int dvb_ca_en50221_init(struct dvb_adapter *dvb_adapter,
1665 struct dvb_ca_en50221 *pubca, int flags, int slot_count)
1666 {
1667 int ret;
1668 struct dvb_ca_private *ca = NULL;
1669 int i;
1670
1671 dprintk("%s\n", __func__);
1672
1673 if (slot_count < 1)
1674 return -EINVAL;
1675
1676 /* initialise the system data */
1677 if ((ca = kzalloc(sizeof(struct dvb_ca_private), GFP_KERNEL)) == NULL) {
1678 ret = -ENOMEM;
1679 goto error;
1680 }
1681 ca->pub = pubca;
1682 ca->flags = flags;
1683 ca->slot_count = slot_count;
1684 if ((ca->slot_info = kcalloc(slot_count, sizeof(struct dvb_ca_slot), GFP_KERNEL)) == NULL) {
1685 ret = -ENOMEM;
1686 goto error;
1687 }
1688 init_waitqueue_head(&ca->wait_queue);
1689 ca->open = 0;
1690 ca->wakeup = 0;
1691 ca->next_read_slot = 0;
1692 pubca->private = ca;
1693
1694 /* register the DVB device */
1695 ret = dvb_register_device(dvb_adapter, &ca->dvbdev, &dvbdev_ca, ca, DVB_DEVICE_CA);
1696 if (ret)
1697 goto error;
1698
1699 /* now initialise each slot */
1700 for (i = 0; i < slot_count; i++) {
1701 memset(&ca->slot_info[i], 0, sizeof(struct dvb_ca_slot));
1702 ca->slot_info[i].slot_state = DVB_CA_SLOTSTATE_NONE;
1703 atomic_set(&ca->slot_info[i].camchange_count, 0);
1704 ca->slot_info[i].camchange_type = DVB_CA_EN50221_CAMCHANGE_REMOVED;
1705 mutex_init(&ca->slot_info[i].slot_lock);
1706 }
1707
1708 mutex_init(&ca->ioctl_mutex);
1709
1710 if (signal_pending(current)) {
1711 ret = -EINTR;
1712 goto error;
1713 }
1714 mb();
1715
1716 /* create a kthread for monitoring this CA device */
1717 ca->thread = kthread_run(dvb_ca_en50221_thread, ca, "kdvb-ca-%i:%i",
1718 ca->dvbdev->adapter->num, ca->dvbdev->id);
1719 if (IS_ERR(ca->thread)) {
1720 ret = PTR_ERR(ca->thread);
1721 printk("dvb_ca_init: failed to start kernel_thread (%d)\n",
1722 ret);
1723 goto error;
1724 }
1725 return 0;
1726
1727 error:
1728 if (ca != NULL) {
1729 if (ca->dvbdev != NULL)
1730 dvb_unregister_device(ca->dvbdev);
1731 kfree(ca->slot_info);
1732 kfree(ca);
1733 }
1734 pubca->private = NULL;
1735 return ret;
1736 }
1737 EXPORT_SYMBOL(dvb_ca_en50221_release);
1738
1739
1740
1741 /**
1742 * Release a DVB CA EN50221 interface device.
1743 *
1744 * @param ca_dev The dvb_device_t instance for the CA device.
1745 * @param ca The associated dvb_ca instance.
1746 */
1747 void dvb_ca_en50221_release(struct dvb_ca_en50221 *pubca)
1748 {
1749 struct dvb_ca_private *ca = pubca->private;
1750 int i;
1751
1752 dprintk("%s\n", __func__);
1753
1754 /* shutdown the thread if there was one */
1755 kthread_stop(ca->thread);
1756
1757 for (i = 0; i < ca->slot_count; i++) {
1758 dvb_ca_en50221_slot_shutdown(ca, i);
1759 vfree(ca->slot_info[i].rx_buffer.data);
1760 }
1761 kfree(ca->slot_info);
1762 dvb_unregister_device(ca->dvbdev);
1763 kfree(ca);
1764 pubca->private = NULL;
1765 }
Linux with added FPC-III support