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[mirror_ubuntu-artful-kernel.git] / drivers / media / dvb-core / dvb_ca_en50221.c
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 * To obtain the license, point your browser to
25 * http://www.gnu.org/copyleft/gpl.html
26 */
27
28 #define pr_fmt(fmt) "dvb_ca_en50221: " fmt
29
30 #include <linux/errno.h>
31 #include <linux/slab.h>
32 #include <linux/list.h>
33 #include <linux/module.h>
34 #include <linux/vmalloc.h>
35 #include <linux/delay.h>
36 #include <linux/spinlock.h>
37 #include <linux/sched/signal.h>
38 #include <linux/kthread.h>
39
40 #include "dvb_ca_en50221.h"
41 #include "dvb_ringbuffer.h"
42
43 static int dvb_ca_en50221_debug;
44
45 module_param_named(cam_debug, dvb_ca_en50221_debug, int, 0644);
46 MODULE_PARM_DESC(cam_debug, "enable verbose debug messages");
47
48 #define dprintk(fmt, arg...) do { \
49 if (dvb_ca_en50221_debug) \
50 printk(KERN_DEBUG pr_fmt("%s: " fmt), __func__, ##arg);\
51 } while (0)
52
53 #define INIT_TIMEOUT_SECS 10
54
55 #define HOST_LINK_BUF_SIZE 0x200
56
57 #define RX_BUFFER_SIZE 65535
58
59 #define MAX_RX_PACKETS_PER_ITERATION 10
60
61 #define CTRLIF_DATA 0
62 #define CTRLIF_COMMAND 1
63 #define CTRLIF_STATUS 1
64 #define CTRLIF_SIZE_LOW 2
65 #define CTRLIF_SIZE_HIGH 3
66
67 #define CMDREG_HC 1 /* Host control */
68 #define CMDREG_SW 2 /* Size write */
69 #define CMDREG_SR 4 /* Size read */
70 #define CMDREG_RS 8 /* Reset interface */
71 #define CMDREG_FRIE 0x40 /* Enable FR interrupt */
72 #define CMDREG_DAIE 0x80 /* Enable DA interrupt */
73 #define IRQEN (CMDREG_DAIE)
74
75 #define STATUSREG_RE 1 /* read error */
76 #define STATUSREG_WE 2 /* write error */
77 #define STATUSREG_FR 0x40 /* module free */
78 #define STATUSREG_DA 0x80 /* data available */
79 #define STATUSREG_TXERR (STATUSREG_RE|STATUSREG_WE) /* general transfer error */
80
81
82 #define DVB_CA_SLOTSTATE_NONE 0
83 #define DVB_CA_SLOTSTATE_UNINITIALISED 1
84 #define DVB_CA_SLOTSTATE_RUNNING 2
85 #define DVB_CA_SLOTSTATE_INVALID 3
86 #define DVB_CA_SLOTSTATE_WAITREADY 4
87 #define DVB_CA_SLOTSTATE_VALIDATE 5
88 #define DVB_CA_SLOTSTATE_WAITFR 6
89 #define DVB_CA_SLOTSTATE_LINKINIT 7
90
91
92 /* Information on a CA slot */
93 struct dvb_ca_slot {
94
95 /* current state of the CAM */
96 int slot_state;
97
98 /* mutex used for serializing access to one CI slot */
99 struct mutex slot_lock;
100
101 /* Number of CAMCHANGES that have occurred since last processing */
102 atomic_t camchange_count;
103
104 /* Type of last CAMCHANGE */
105 int camchange_type;
106
107 /* base address of CAM config */
108 u32 config_base;
109
110 /* value to write into Config Control register */
111 u8 config_option;
112
113 /* if 1, the CAM supports DA IRQs */
114 u8 da_irq_supported:1;
115
116 /* size of the buffer to use when talking to the CAM */
117 int link_buf_size;
118
119 /* buffer for incoming packets */
120 struct dvb_ringbuffer rx_buffer;
121
122 /* timer used during various states of the slot */
123 unsigned long timeout;
124 };
125
126 /* Private CA-interface information */
127 struct dvb_ca_private {
128 struct kref refcount;
129
130 /* pointer back to the public data structure */
131 struct dvb_ca_en50221 *pub;
132
133 /* the DVB device */
134 struct dvb_device *dvbdev;
135
136 /* Flags describing the interface (DVB_CA_FLAG_*) */
137 u32 flags;
138
139 /* number of slots supported by this CA interface */
140 unsigned int slot_count;
141
142 /* information on each slot */
143 struct dvb_ca_slot *slot_info;
144
145 /* wait queues for read() and write() operations */
146 wait_queue_head_t wait_queue;
147
148 /* PID of the monitoring thread */
149 struct task_struct *thread;
150
151 /* Flag indicating if the CA device is open */
152 unsigned int open:1;
153
154 /* Flag indicating the thread should wake up now */
155 unsigned int wakeup:1;
156
157 /* Delay the main thread should use */
158 unsigned long delay;
159
160 /* Slot to start looking for data to read from in the next user-space read operation */
161 int next_read_slot;
162
163 /* mutex serializing ioctls */
164 struct mutex ioctl_mutex;
165 };
166
167 static void dvb_ca_private_free(struct dvb_ca_private *ca)
168 {
169 unsigned int i;
170
171 dvb_free_device(ca->dvbdev);
172 for (i = 0; i < ca->slot_count; i++)
173 vfree(ca->slot_info[i].rx_buffer.data);
174
175 kfree(ca->slot_info);
176 kfree(ca);
177 }
178
179 static void dvb_ca_private_release(struct kref *ref)
180 {
181 struct dvb_ca_private *ca = container_of(ref, struct dvb_ca_private, refcount);
182 dvb_ca_private_free(ca);
183 }
184
185 static void dvb_ca_private_get(struct dvb_ca_private *ca)
186 {
187 kref_get(&ca->refcount);
188 }
189
190 static void dvb_ca_private_put(struct dvb_ca_private *ca)
191 {
192 kref_put(&ca->refcount, dvb_ca_private_release);
193 }
194
195 static void dvb_ca_en50221_thread_wakeup(struct dvb_ca_private *ca);
196 static int dvb_ca_en50221_read_data(struct dvb_ca_private *ca, int slot,
197 u8 *ebuf, int ecount);
198 static int dvb_ca_en50221_write_data(struct dvb_ca_private *ca, int slot,
199 u8 *ebuf, int ecount);
200
201
202 /**
203 * Safely find needle in haystack.
204 *
205 * @haystack: Buffer to look in.
206 * @hlen: Number of bytes in haystack.
207 * @needle: Buffer to find.
208 * @nlen: Number of bytes in needle.
209 * @return Pointer into haystack needle was found at, or NULL if not found.
210 */
211 static char *findstr(char *haystack, int hlen, char *needle, int nlen)
212 {
213 int i;
214
215 if (hlen < nlen)
216 return NULL;
217
218 for (i = 0; i <= hlen - nlen; i++) {
219 if (!strncmp(haystack + i, needle, nlen))
220 return haystack + i;
221 }
222
223 return NULL;
224 }
225
226
227
228 /* ******************************************************************************** */
229 /* EN50221 physical interface functions */
230
231
232 /**
233 * dvb_ca_en50221_check_camstatus - Check CAM status.
234 */
235 static int dvb_ca_en50221_check_camstatus(struct dvb_ca_private *ca, int slot)
236 {
237 int slot_status;
238 int cam_present_now;
239 int cam_changed;
240
241 /* IRQ mode */
242 if (ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE) {
243 return (atomic_read(&ca->slot_info[slot].camchange_count) != 0);
244 }
245
246 /* poll mode */
247 slot_status = ca->pub->poll_slot_status(ca->pub, slot, ca->open);
248
249 cam_present_now = (slot_status & DVB_CA_EN50221_POLL_CAM_PRESENT) ? 1 : 0;
250 cam_changed = (slot_status & DVB_CA_EN50221_POLL_CAM_CHANGED) ? 1 : 0;
251 if (!cam_changed) {
252 int cam_present_old = (ca->slot_info[slot].slot_state != DVB_CA_SLOTSTATE_NONE);
253 cam_changed = (cam_present_now != cam_present_old);
254 }
255
256 if (cam_changed) {
257 if (!cam_present_now) {
258 ca->slot_info[slot].camchange_type = DVB_CA_EN50221_CAMCHANGE_REMOVED;
259 } else {
260 ca->slot_info[slot].camchange_type = DVB_CA_EN50221_CAMCHANGE_INSERTED;
261 }
262 atomic_set(&ca->slot_info[slot].camchange_count, 1);
263 } else {
264 if ((ca->slot_info[slot].slot_state == DVB_CA_SLOTSTATE_WAITREADY) &&
265 (slot_status & DVB_CA_EN50221_POLL_CAM_READY)) {
266 // move to validate state if reset is completed
267 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_VALIDATE;
268 }
269 }
270
271 return cam_changed;
272 }
273
274
275 /**
276 * dvb_ca_en50221_wait_if_status - Wait for flags to become set on the STATUS
277 * register on a CAM interface, checking for errors and timeout.
278 *
279 * @ca: CA instance.
280 * @slot: Slot on interface.
281 * @waitfor: Flags to wait for.
282 * @timeout_ms: Timeout in milliseconds.
283 *
284 * @return 0 on success, nonzero on error.
285 */
286 static int dvb_ca_en50221_wait_if_status(struct dvb_ca_private *ca, int slot,
287 u8 waitfor, int timeout_hz)
288 {
289 unsigned long timeout;
290 unsigned long start;
291
292 dprintk("%s\n", __func__);
293
294 /* loop until timeout elapsed */
295 start = jiffies;
296 timeout = jiffies + timeout_hz;
297 while (1) {
298 /* read the status and check for error */
299 int res = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS);
300 if (res < 0)
301 return -EIO;
302
303 /* if we got the flags, it was successful! */
304 if (res & waitfor) {
305 dprintk("%s succeeded timeout:%lu\n",
306 __func__, jiffies - start);
307 return 0;
308 }
309
310 /* check for timeout */
311 if (time_after(jiffies, timeout)) {
312 break;
313 }
314
315 /* wait for a bit */
316 msleep(1);
317 }
318
319 dprintk("%s failed timeout:%lu\n", __func__, jiffies - start);
320
321 /* if we get here, we've timed out */
322 return -ETIMEDOUT;
323 }
324
325
326 /**
327 * dvb_ca_en50221_link_init - Initialise the link layer connection to a CAM.
328 *
329 * @ca: CA instance.
330 * @slot: Slot id.
331 *
332 * @return 0 on success, nonzero on failure.
333 */
334 static int dvb_ca_en50221_link_init(struct dvb_ca_private *ca, int slot)
335 {
336 int ret;
337 int buf_size;
338 u8 buf[2];
339
340 dprintk("%s\n", __func__);
341
342 /* we'll be determining these during this function */
343 ca->slot_info[slot].da_irq_supported = 0;
344
345 /* set the host link buffer size temporarily. it will be overwritten with the
346 * real negotiated size later. */
347 ca->slot_info[slot].link_buf_size = 2;
348
349 /* read the buffer size from the CAM */
350 if ((ret = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, IRQEN | CMDREG_SR)) != 0)
351 return ret;
352 if ((ret = dvb_ca_en50221_wait_if_status(ca, slot, STATUSREG_DA, HZ / 10)) != 0)
353 return ret;
354 if ((ret = dvb_ca_en50221_read_data(ca, slot, buf, 2)) != 2)
355 return -EIO;
356 if ((ret = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, IRQEN)) != 0)
357 return ret;
358
359 /* store it, and choose the minimum of our buffer and the CAM's buffer size */
360 buf_size = (buf[0] << 8) | buf[1];
361 if (buf_size > HOST_LINK_BUF_SIZE)
362 buf_size = HOST_LINK_BUF_SIZE;
363 ca->slot_info[slot].link_buf_size = buf_size;
364 buf[0] = buf_size >> 8;
365 buf[1] = buf_size & 0xff;
366 dprintk("Chosen link buffer size of %i\n", buf_size);
367
368 /* write the buffer size to the CAM */
369 if ((ret = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, IRQEN | CMDREG_SW)) != 0)
370 return ret;
371 if ((ret = dvb_ca_en50221_wait_if_status(ca, slot, STATUSREG_FR, HZ / 10)) != 0)
372 return ret;
373 if ((ret = dvb_ca_en50221_write_data(ca, slot, buf, 2)) != 2)
374 return -EIO;
375 if ((ret = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, IRQEN)) != 0)
376 return ret;
377
378 /* success */
379 return 0;
380 }
381
382 /**
383 * dvb_ca_en50221_read_tuple - Read a tuple from attribute memory.
384 *
385 * @ca: CA instance.
386 * @slot: Slot id.
387 * @address: Address to read from. Updated.
388 * @tupleType: Tuple id byte. Updated.
389 * @tupleLength: Tuple length. Updated.
390 * @tuple: Dest buffer for tuple (must be 256 bytes). Updated.
391 *
392 * @return 0 on success, nonzero on error.
393 */
394 static int dvb_ca_en50221_read_tuple(struct dvb_ca_private *ca, int slot,
395 int *address, int *tupleType,
396 int *tupleLength, u8 *tuple)
397 {
398 int i;
399 int _tupleType;
400 int _tupleLength;
401 int _address = *address;
402
403 /* grab the next tuple length and type */
404 if ((_tupleType = ca->pub->read_attribute_mem(ca->pub, slot, _address)) < 0)
405 return _tupleType;
406 if (_tupleType == 0xff) {
407 dprintk("END OF CHAIN TUPLE type:0x%x\n", _tupleType);
408 *address += 2;
409 *tupleType = _tupleType;
410 *tupleLength = 0;
411 return 0;
412 }
413 if ((_tupleLength = ca->pub->read_attribute_mem(ca->pub, slot, _address + 2)) < 0)
414 return _tupleLength;
415 _address += 4;
416
417 dprintk("TUPLE type:0x%x length:%i\n", _tupleType, _tupleLength);
418
419 /* read in the whole tuple */
420 for (i = 0; i < _tupleLength; i++) {
421 tuple[i] = ca->pub->read_attribute_mem(ca->pub, slot, _address + (i * 2));
422 dprintk(" 0x%02x: 0x%02x %c\n",
423 i, tuple[i] & 0xff,
424 ((tuple[i] > 31) && (tuple[i] < 127)) ? tuple[i] : '.');
425 }
426 _address += (_tupleLength * 2);
427
428 // success
429 *tupleType = _tupleType;
430 *tupleLength = _tupleLength;
431 *address = _address;
432 return 0;
433 }
434
435
436 /**
437 * dvb_ca_en50221_parse_attributes - Parse attribute memory of a CAM module,
438 * extracting Config register, and checking it is a DVB CAM module.
439 *
440 * @ca: CA instance.
441 * @slot: Slot id.
442 *
443 * @return 0 on success, <0 on failure.
444 */
445 static int dvb_ca_en50221_parse_attributes(struct dvb_ca_private *ca, int slot)
446 {
447 int address = 0;
448 int tupleLength;
449 int tupleType;
450 u8 tuple[257];
451 char *dvb_str;
452 int rasz;
453 int status;
454 int got_cftableentry = 0;
455 int end_chain = 0;
456 int i;
457 u16 manfid = 0;
458 u16 devid = 0;
459
460
461 // CISTPL_DEVICE_0A
462 if ((status =
463 dvb_ca_en50221_read_tuple(ca, slot, &address, &tupleType, &tupleLength, tuple)) < 0)
464 return status;
465 if (tupleType != 0x1D)
466 return -EINVAL;
467
468
469
470 // CISTPL_DEVICE_0C
471 if ((status =
472 dvb_ca_en50221_read_tuple(ca, slot, &address, &tupleType, &tupleLength, tuple)) < 0)
473 return status;
474 if (tupleType != 0x1C)
475 return -EINVAL;
476
477
478
479 // CISTPL_VERS_1
480 if ((status =
481 dvb_ca_en50221_read_tuple(ca, slot, &address, &tupleType, &tupleLength, tuple)) < 0)
482 return status;
483 if (tupleType != 0x15)
484 return -EINVAL;
485
486
487
488 // CISTPL_MANFID
489 if ((status = dvb_ca_en50221_read_tuple(ca, slot, &address, &tupleType,
490 &tupleLength, tuple)) < 0)
491 return status;
492 if (tupleType != 0x20)
493 return -EINVAL;
494 if (tupleLength != 4)
495 return -EINVAL;
496 manfid = (tuple[1] << 8) | tuple[0];
497 devid = (tuple[3] << 8) | tuple[2];
498
499
500
501 // CISTPL_CONFIG
502 if ((status = dvb_ca_en50221_read_tuple(ca, slot, &address, &tupleType,
503 &tupleLength, tuple)) < 0)
504 return status;
505 if (tupleType != 0x1A)
506 return -EINVAL;
507 if (tupleLength < 3)
508 return -EINVAL;
509
510 /* extract the configbase */
511 rasz = tuple[0] & 3;
512 if (tupleLength < (3 + rasz + 14))
513 return -EINVAL;
514 ca->slot_info[slot].config_base = 0;
515 for (i = 0; i < rasz + 1; i++) {
516 ca->slot_info[slot].config_base |= (tuple[2 + i] << (8 * i));
517 }
518
519 /* check it contains the correct DVB string */
520 dvb_str = findstr((char *)tuple, tupleLength, "DVB_CI_V", 8);
521 if (dvb_str == NULL)
522 return -EINVAL;
523 if (tupleLength < ((dvb_str - (char *) tuple) + 12))
524 return -EINVAL;
525
526 /* is it a version we support? */
527 if (strncmp(dvb_str + 8, "1.00", 4)) {
528 pr_err("dvb_ca adapter %d: Unsupported DVB CAM module version %c%c%c%c\n",
529 ca->dvbdev->adapter->num, dvb_str[8], dvb_str[9],
530 dvb_str[10], dvb_str[11]);
531 return -EINVAL;
532 }
533
534 /* process the CFTABLE_ENTRY tuples, and any after those */
535 while ((!end_chain) && (address < 0x1000)) {
536 if ((status = dvb_ca_en50221_read_tuple(ca, slot, &address, &tupleType,
537 &tupleLength, tuple)) < 0)
538 return status;
539 switch (tupleType) {
540 case 0x1B: // CISTPL_CFTABLE_ENTRY
541 if (tupleLength < (2 + 11 + 17))
542 break;
543
544 /* if we've already parsed one, just use it */
545 if (got_cftableentry)
546 break;
547
548 /* get the config option */
549 ca->slot_info[slot].config_option = tuple[0] & 0x3f;
550
551 /* OK, check it contains the correct strings */
552 if ((findstr((char *)tuple, tupleLength, "DVB_HOST", 8) == NULL) ||
553 (findstr((char *)tuple, tupleLength, "DVB_CI_MODULE", 13) == NULL))
554 break;
555
556 got_cftableentry = 1;
557 break;
558
559 case 0x14: // CISTPL_NO_LINK
560 break;
561
562 case 0xFF: // CISTPL_END
563 end_chain = 1;
564 break;
565
566 default: /* Unknown tuple type - just skip this tuple and move to the next one */
567 dprintk("dvb_ca: Skipping unknown tuple type:0x%x length:0x%x\n",
568 tupleType, tupleLength);
569 break;
570 }
571 }
572
573 if ((address > 0x1000) || (!got_cftableentry))
574 return -EINVAL;
575
576 dprintk("Valid DVB CAM detected MANID:%x DEVID:%x CONFIGBASE:0x%x CONFIGOPTION:0x%x\n",
577 manfid, devid, ca->slot_info[slot].config_base,
578 ca->slot_info[slot].config_option);
579
580 // success!
581 return 0;
582 }
583
584
585 /**
586 * dvb_ca_en50221_set_configoption - Set CAM's configoption correctly.
587 *
588 * @ca: CA instance.
589 * @slot: Slot containing the CAM.
590 */
591 static int dvb_ca_en50221_set_configoption(struct dvb_ca_private *ca, int slot)
592 {
593 int configoption;
594
595 dprintk("%s\n", __func__);
596
597 /* set the config option */
598 ca->pub->write_attribute_mem(ca->pub, slot,
599 ca->slot_info[slot].config_base,
600 ca->slot_info[slot].config_option);
601
602 /* check it */
603 configoption = ca->pub->read_attribute_mem(ca->pub, slot, ca->slot_info[slot].config_base);
604 dprintk("Set configoption 0x%x, read configoption 0x%x\n",
605 ca->slot_info[slot].config_option, configoption & 0x3f);
606
607 /* fine! */
608 return 0;
609
610 }
611
612
613 /**
614 * dvb_ca_en50221_read_data - This function talks to an EN50221 CAM control
615 * interface. It reads a buffer of data from the CAM. The data can either
616 * be stored in a supplied buffer, or automatically be added to the slot's
617 * rx_buffer.
618 *
619 * @ca: CA instance.
620 * @slot: Slot to read from.
621 * @ebuf: If non-NULL, the data will be written to this buffer. If NULL,
622 * the data will be added into the buffering system as a normal fragment.
623 * @ecount: Size of ebuf. Ignored if ebuf is NULL.
624 *
625 * @return Number of bytes read, or < 0 on error
626 */
627 static int dvb_ca_en50221_read_data(struct dvb_ca_private *ca, int slot,
628 u8 *ebuf, int ecount)
629 {
630 int bytes_read;
631 int status;
632 u8 buf[HOST_LINK_BUF_SIZE];
633 int i;
634
635 dprintk("%s\n", __func__);
636
637 /* check if we have space for a link buf in the rx_buffer */
638 if (ebuf == NULL) {
639 int buf_free;
640
641 if (ca->slot_info[slot].rx_buffer.data == NULL) {
642 status = -EIO;
643 goto exit;
644 }
645 buf_free = dvb_ringbuffer_free(&ca->slot_info[slot].rx_buffer);
646
647 if (buf_free < (ca->slot_info[slot].link_buf_size + DVB_RINGBUFFER_PKTHDRSIZE)) {
648 status = -EAGAIN;
649 goto exit;
650 }
651 }
652
653 /* check if there is data available */
654 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS)) < 0)
655 goto exit;
656 if (!(status & STATUSREG_DA)) {
657 /* no data */
658 status = 0;
659 goto exit;
660 }
661
662 /* read the amount of data */
663 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_SIZE_HIGH)) < 0)
664 goto exit;
665 bytes_read = status << 8;
666 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_SIZE_LOW)) < 0)
667 goto exit;
668 bytes_read |= status;
669
670 /* check it will fit */
671 if (ebuf == NULL) {
672 if (bytes_read > ca->slot_info[slot].link_buf_size) {
673 pr_err("dvb_ca adapter %d: CAM tried to send a buffer larger than the link buffer size (%i > %i)!\n",
674 ca->dvbdev->adapter->num, bytes_read,
675 ca->slot_info[slot].link_buf_size);
676 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_LINKINIT;
677 status = -EIO;
678 goto exit;
679 }
680 if (bytes_read < 2) {
681 pr_err("dvb_ca adapter %d: CAM sent a buffer that was less than 2 bytes!\n",
682 ca->dvbdev->adapter->num);
683 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_LINKINIT;
684 status = -EIO;
685 goto exit;
686 }
687 } else {
688 if (bytes_read > ecount) {
689 pr_err("dvb_ca adapter %d: CAM tried to send a buffer larger than the ecount size!\n",
690 ca->dvbdev->adapter->num);
691 status = -EIO;
692 goto exit;
693 }
694 }
695
696 /* fill the buffer */
697 for (i = 0; i < bytes_read; i++) {
698 /* read byte and check */
699 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_DATA)) < 0)
700 goto exit;
701
702 /* OK, store it in the buffer */
703 buf[i] = status;
704 }
705
706 /* check for read error (RE should now be 0) */
707 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS)) < 0)
708 goto exit;
709 if (status & STATUSREG_RE) {
710 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_LINKINIT;
711 status = -EIO;
712 goto exit;
713 }
714
715 /* OK, add it to the receive buffer, or copy into external buffer if supplied */
716 if (ebuf == NULL) {
717 if (ca->slot_info[slot].rx_buffer.data == NULL) {
718 status = -EIO;
719 goto exit;
720 }
721 dvb_ringbuffer_pkt_write(&ca->slot_info[slot].rx_buffer, buf, bytes_read);
722 } else {
723 memcpy(ebuf, buf, bytes_read);
724 }
725
726 dprintk("Received CA packet for slot %i connection id 0x%x last_frag:%i size:0x%x\n", slot,
727 buf[0], (buf[1] & 0x80) == 0, bytes_read);
728
729 /* wake up readers when a last_fragment is received */
730 if ((buf[1] & 0x80) == 0x00) {
731 wake_up_interruptible(&ca->wait_queue);
732 }
733 status = bytes_read;
734
735 exit:
736 return status;
737 }
738
739
740 /**
741 * dvb_ca_en50221_write_data - This function talks to an EN50221 CAM control
742 * interface. It writes a buffer of data to a CAM.
743 *
744 * @ca: CA instance.
745 * @slot: Slot to write to.
746 * @ebuf: The data in this buffer is treated as a complete link-level packet to
747 * be written.
748 * @count: Size of ebuf.
749 *
750 * @return Number of bytes written, or < 0 on error.
751 */
752 static int dvb_ca_en50221_write_data(struct dvb_ca_private *ca, int slot,
753 u8 *buf, int bytes_write)
754 {
755 int status;
756 int i;
757
758 dprintk("%s\n", __func__);
759
760
761 /* sanity check */
762 if (bytes_write > ca->slot_info[slot].link_buf_size)
763 return -EINVAL;
764
765 /* it is possible we are dealing with a single buffer implementation,
766 thus if there is data available for read or if there is even a read
767 already in progress, we do nothing but awake the kernel thread to
768 process the data if necessary. */
769 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS)) < 0)
770 goto exitnowrite;
771 if (status & (STATUSREG_DA | STATUSREG_RE)) {
772 if (status & STATUSREG_DA)
773 dvb_ca_en50221_thread_wakeup(ca);
774
775 status = -EAGAIN;
776 goto exitnowrite;
777 }
778
779 /* OK, set HC bit */
780 if ((status = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND,
781 IRQEN | CMDREG_HC)) != 0)
782 goto exit;
783
784 /* check if interface is still free */
785 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS)) < 0)
786 goto exit;
787 if (!(status & STATUSREG_FR)) {
788 /* it wasn't free => try again later */
789 status = -EAGAIN;
790 goto exit;
791 }
792
793 /*
794 * It may need some time for the CAM to settle down, or there might
795 * be a race condition between the CAM, writing HC and our last
796 * check for DA. This happens, if the CAM asserts DA, just after
797 * checking DA before we are setting HC. In this case it might be
798 * a bug in the CAM to keep the FR bit, the lower layer/HW
799 * communication requires a longer timeout or the CAM needs more
800 * time internally. But this happens in reality!
801 * We need to read the status from the HW again and do the same
802 * we did for the previous check for DA
803 */
804 status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS);
805 if (status < 0)
806 goto exit;
807
808 if (status & (STATUSREG_DA | STATUSREG_RE)) {
809 if (status & STATUSREG_DA)
810 dvb_ca_en50221_thread_wakeup(ca);
811
812 status = -EAGAIN;
813 goto exit;
814 }
815
816 /* send the amount of data */
817 if ((status = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_SIZE_HIGH, bytes_write >> 8)) != 0)
818 goto exit;
819 if ((status = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_SIZE_LOW,
820 bytes_write & 0xff)) != 0)
821 goto exit;
822
823 /* send the buffer */
824 for (i = 0; i < bytes_write; i++) {
825 if ((status = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_DATA, buf[i])) != 0)
826 goto exit;
827 }
828
829 /* check for write error (WE should now be 0) */
830 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS)) < 0)
831 goto exit;
832 if (status & STATUSREG_WE) {
833 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_LINKINIT;
834 status = -EIO;
835 goto exit;
836 }
837 status = bytes_write;
838
839 dprintk("Wrote CA packet for slot %i, connection id 0x%x last_frag:%i size:0x%x\n", slot,
840 buf[0], (buf[1] & 0x80) == 0, bytes_write);
841
842 exit:
843 ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, IRQEN);
844
845 exitnowrite:
846 return status;
847 }
848
849
850
851 /* ******************************************************************************** */
852 /* EN50221 higher level functions */
853
854
855 /**
856 * dvb_ca_en50221_slot_shutdown - A CAM has been removed => shut it down.
857 *
858 * @ca: CA instance.
859 * @slot: Slot to shut down.
860 */
861 static int dvb_ca_en50221_slot_shutdown(struct dvb_ca_private *ca, int slot)
862 {
863 dprintk("%s\n", __func__);
864
865 ca->pub->slot_shutdown(ca->pub, slot);
866 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_NONE;
867
868 /* need to wake up all processes to check if they're now
869 trying to write to a defunct CAM */
870 wake_up_interruptible(&ca->wait_queue);
871
872 dprintk("Slot %i shutdown\n", slot);
873
874 /* success */
875 return 0;
876 }
877
878
879 /**
880 * dvb_ca_en50221_camchange_irq - A CAMCHANGE IRQ has occurred.
881 *
882 * @ca: CA instance.
883 * @slot: Slot concerned.
884 * @change_type: One of the DVB_CA_CAMCHANGE_* values.
885 */
886 void dvb_ca_en50221_camchange_irq(struct dvb_ca_en50221 *pubca, int slot, int change_type)
887 {
888 struct dvb_ca_private *ca = pubca->private;
889
890 dprintk("CAMCHANGE IRQ slot:%i change_type:%i\n", slot, change_type);
891
892 switch (change_type) {
893 case DVB_CA_EN50221_CAMCHANGE_REMOVED:
894 case DVB_CA_EN50221_CAMCHANGE_INSERTED:
895 break;
896
897 default:
898 return;
899 }
900
901 ca->slot_info[slot].camchange_type = change_type;
902 atomic_inc(&ca->slot_info[slot].camchange_count);
903 dvb_ca_en50221_thread_wakeup(ca);
904 }
905 EXPORT_SYMBOL(dvb_ca_en50221_camchange_irq);
906
907
908 /**
909 * dvb_ca_en50221_camready_irq - A CAMREADY IRQ has occurred.
910 *
911 * @ca: CA instance.
912 * @slot: Slot concerned.
913 */
914 void dvb_ca_en50221_camready_irq(struct dvb_ca_en50221 *pubca, int slot)
915 {
916 struct dvb_ca_private *ca = pubca->private;
917
918 dprintk("CAMREADY IRQ slot:%i\n", slot);
919
920 if (ca->slot_info[slot].slot_state == DVB_CA_SLOTSTATE_WAITREADY) {
921 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_VALIDATE;
922 dvb_ca_en50221_thread_wakeup(ca);
923 }
924 }
925 EXPORT_SYMBOL(dvb_ca_en50221_camready_irq);
926
927
928 /**
929 * dvb_ca_en50221_frda_irq - An FR or DA IRQ has occurred.
930 *
931 * @ca: CA instance.
932 * @slot: Slot concerned.
933 */
934 void dvb_ca_en50221_frda_irq(struct dvb_ca_en50221 *pubca, int slot)
935 {
936 struct dvb_ca_private *ca = pubca->private;
937 int flags;
938
939 dprintk("FR/DA IRQ slot:%i\n", slot);
940
941 switch (ca->slot_info[slot].slot_state) {
942 case DVB_CA_SLOTSTATE_LINKINIT:
943 flags = ca->pub->read_cam_control(pubca, slot, CTRLIF_STATUS);
944 if (flags & STATUSREG_DA) {
945 dprintk("CAM supports DA IRQ\n");
946 ca->slot_info[slot].da_irq_supported = 1;
947 }
948 break;
949
950 case DVB_CA_SLOTSTATE_RUNNING:
951 if (ca->open)
952 dvb_ca_en50221_thread_wakeup(ca);
953 break;
954 }
955 }
956 EXPORT_SYMBOL(dvb_ca_en50221_frda_irq);
957
958
959 /* ******************************************************************************** */
960 /* EN50221 thread functions */
961
962 /**
963 * Wake up the DVB CA thread
964 *
965 * @ca: CA instance.
966 */
967 static void dvb_ca_en50221_thread_wakeup(struct dvb_ca_private *ca)
968 {
969
970 dprintk("%s\n", __func__);
971
972 ca->wakeup = 1;
973 mb();
974 wake_up_process(ca->thread);
975 }
976
977 /**
978 * Update the delay used by the thread.
979 *
980 * @ca: CA instance.
981 */
982 static void dvb_ca_en50221_thread_update_delay(struct dvb_ca_private *ca)
983 {
984 int delay;
985 int curdelay = 100000000;
986 int slot;
987
988 /* Beware of too high polling frequency, because one polling
989 * call might take several hundred milliseconds until timeout!
990 */
991 for (slot = 0; slot < ca->slot_count; slot++) {
992 switch (ca->slot_info[slot].slot_state) {
993 default:
994 case DVB_CA_SLOTSTATE_NONE:
995 delay = HZ * 60; /* 60s */
996 if (!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE))
997 delay = HZ * 5; /* 5s */
998 break;
999 case DVB_CA_SLOTSTATE_INVALID:
1000 delay = HZ * 60; /* 60s */
1001 if (!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE))
1002 delay = HZ / 10; /* 100ms */
1003 break;
1004
1005 case DVB_CA_SLOTSTATE_UNINITIALISED:
1006 case DVB_CA_SLOTSTATE_WAITREADY:
1007 case DVB_CA_SLOTSTATE_VALIDATE:
1008 case DVB_CA_SLOTSTATE_WAITFR:
1009 case DVB_CA_SLOTSTATE_LINKINIT:
1010 delay = HZ / 10; /* 100ms */
1011 break;
1012
1013 case DVB_CA_SLOTSTATE_RUNNING:
1014 delay = HZ * 60; /* 60s */
1015 if (!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE))
1016 delay = HZ / 10; /* 100ms */
1017 if (ca->open) {
1018 if ((!ca->slot_info[slot].da_irq_supported) ||
1019 (!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_DA)))
1020 delay = HZ / 10; /* 100ms */
1021 }
1022 break;
1023 }
1024
1025 if (delay < curdelay)
1026 curdelay = delay;
1027 }
1028
1029 ca->delay = curdelay;
1030 }
1031
1032
1033
1034 /**
1035 * Kernel thread which monitors CA slots for CAM changes, and performs data transfers.
1036 */
1037 static int dvb_ca_en50221_thread(void *data)
1038 {
1039 struct dvb_ca_private *ca = data;
1040 int slot;
1041 int flags;
1042 int status;
1043 int pktcount;
1044 void *rxbuf;
1045
1046 dprintk("%s\n", __func__);
1047
1048 /* choose the correct initial delay */
1049 dvb_ca_en50221_thread_update_delay(ca);
1050
1051 /* main loop */
1052 while (!kthread_should_stop()) {
1053 /* sleep for a bit */
1054 if (!ca->wakeup) {
1055 set_current_state(TASK_INTERRUPTIBLE);
1056 schedule_timeout(ca->delay);
1057 if (kthread_should_stop())
1058 return 0;
1059 }
1060 ca->wakeup = 0;
1061
1062 /* go through all the slots processing them */
1063 for (slot = 0; slot < ca->slot_count; slot++) {
1064
1065 mutex_lock(&ca->slot_info[slot].slot_lock);
1066
1067 // check the cam status + deal with CAMCHANGEs
1068 while (dvb_ca_en50221_check_camstatus(ca, slot)) {
1069 /* clear down an old CI slot if necessary */
1070 if (ca->slot_info[slot].slot_state != DVB_CA_SLOTSTATE_NONE)
1071 dvb_ca_en50221_slot_shutdown(ca, slot);
1072
1073 /* if a CAM is NOW present, initialise it */
1074 if (ca->slot_info[slot].camchange_type == DVB_CA_EN50221_CAMCHANGE_INSERTED) {
1075 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_UNINITIALISED;
1076 }
1077
1078 /* we've handled one CAMCHANGE */
1079 dvb_ca_en50221_thread_update_delay(ca);
1080 atomic_dec(&ca->slot_info[slot].camchange_count);
1081 }
1082
1083 // CAM state machine
1084 switch (ca->slot_info[slot].slot_state) {
1085 case DVB_CA_SLOTSTATE_NONE:
1086 case DVB_CA_SLOTSTATE_INVALID:
1087 // no action needed
1088 break;
1089
1090 case DVB_CA_SLOTSTATE_UNINITIALISED:
1091 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_WAITREADY;
1092 ca->pub->slot_reset(ca->pub, slot);
1093 ca->slot_info[slot].timeout = jiffies + (INIT_TIMEOUT_SECS * HZ);
1094 break;
1095
1096 case DVB_CA_SLOTSTATE_WAITREADY:
1097 if (time_after(jiffies, ca->slot_info[slot].timeout)) {
1098 pr_err("dvb_ca adaptor %d: PC card did not respond :(\n",
1099 ca->dvbdev->adapter->num);
1100 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID;
1101 dvb_ca_en50221_thread_update_delay(ca);
1102 break;
1103 }
1104 // no other action needed; will automatically change state when ready
1105 break;
1106
1107 case DVB_CA_SLOTSTATE_VALIDATE:
1108 if (dvb_ca_en50221_parse_attributes(ca, slot) != 0) {
1109 /* we need this extra check for annoying interfaces like the budget-av */
1110 if ((!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE)) &&
1111 (ca->pub->poll_slot_status)) {
1112 status = ca->pub->poll_slot_status(ca->pub, slot, 0);
1113 if (!(status & DVB_CA_EN50221_POLL_CAM_PRESENT)) {
1114 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_NONE;
1115 dvb_ca_en50221_thread_update_delay(ca);
1116 break;
1117 }
1118 }
1119
1120 pr_err("dvb_ca adapter %d: Invalid PC card inserted :(\n",
1121 ca->dvbdev->adapter->num);
1122 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID;
1123 dvb_ca_en50221_thread_update_delay(ca);
1124 break;
1125 }
1126 if (dvb_ca_en50221_set_configoption(ca, slot) != 0) {
1127 pr_err("dvb_ca adapter %d: Unable to initialise CAM :(\n",
1128 ca->dvbdev->adapter->num);
1129 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID;
1130 dvb_ca_en50221_thread_update_delay(ca);
1131 break;
1132 }
1133 if (ca->pub->write_cam_control(ca->pub, slot,
1134 CTRLIF_COMMAND, CMDREG_RS) != 0) {
1135 pr_err("dvb_ca adapter %d: Unable to reset CAM IF\n",
1136 ca->dvbdev->adapter->num);
1137 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID;
1138 dvb_ca_en50221_thread_update_delay(ca);
1139 break;
1140 }
1141 dprintk("DVB CAM validated successfully\n");
1142
1143 ca->slot_info[slot].timeout = jiffies + (INIT_TIMEOUT_SECS * HZ);
1144 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_WAITFR;
1145 ca->wakeup = 1;
1146 break;
1147
1148 case DVB_CA_SLOTSTATE_WAITFR:
1149 if (time_after(jiffies, ca->slot_info[slot].timeout)) {
1150 pr_err("dvb_ca adapter %d: DVB CAM did not respond :(\n",
1151 ca->dvbdev->adapter->num);
1152 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID;
1153 dvb_ca_en50221_thread_update_delay(ca);
1154 break;
1155 }
1156
1157 flags = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS);
1158 if (flags & STATUSREG_FR) {
1159 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_LINKINIT;
1160 ca->wakeup = 1;
1161 }
1162 break;
1163
1164 case DVB_CA_SLOTSTATE_LINKINIT:
1165 if (dvb_ca_en50221_link_init(ca, slot) != 0) {
1166 /* we need this extra check for annoying interfaces like the budget-av */
1167 if ((!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE)) &&
1168 (ca->pub->poll_slot_status)) {
1169 status = ca->pub->poll_slot_status(ca->pub, slot, 0);
1170 if (!(status & DVB_CA_EN50221_POLL_CAM_PRESENT)) {
1171 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_NONE;
1172 dvb_ca_en50221_thread_update_delay(ca);
1173 break;
1174 }
1175 }
1176
1177 pr_err("dvb_ca adapter %d: DVB CAM link initialisation failed :(\n",
1178 ca->dvbdev->adapter->num);
1179 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID;
1180 dvb_ca_en50221_thread_update_delay(ca);
1181 break;
1182 }
1183
1184 if (ca->slot_info[slot].rx_buffer.data == NULL) {
1185 rxbuf = vmalloc(RX_BUFFER_SIZE);
1186 if (rxbuf == NULL) {
1187 pr_err("dvb_ca adapter %d: Unable to allocate CAM rx buffer :(\n",
1188 ca->dvbdev->adapter->num);
1189 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID;
1190 dvb_ca_en50221_thread_update_delay(ca);
1191 break;
1192 }
1193 dvb_ringbuffer_init(&ca->slot_info[slot].rx_buffer, rxbuf, RX_BUFFER_SIZE);
1194 }
1195
1196 ca->pub->slot_ts_enable(ca->pub, slot);
1197 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_RUNNING;
1198 dvb_ca_en50221_thread_update_delay(ca);
1199 pr_err("dvb_ca adapter %d: DVB CAM detected and initialised successfully\n",
1200 ca->dvbdev->adapter->num);
1201 break;
1202
1203 case DVB_CA_SLOTSTATE_RUNNING:
1204 if (!ca->open)
1205 break;
1206
1207 // poll slots for data
1208 pktcount = 0;
1209 while ((status = dvb_ca_en50221_read_data(ca, slot, NULL, 0)) > 0) {
1210 if (!ca->open)
1211 break;
1212
1213 /* if a CAMCHANGE occurred at some point, do not do any more processing of this slot */
1214 if (dvb_ca_en50221_check_camstatus(ca, slot)) {
1215 // we dont want to sleep on the next iteration so we can handle the cam change
1216 ca->wakeup = 1;
1217 break;
1218 }
1219
1220 /* check if we've hit our limit this time */
1221 if (++pktcount >= MAX_RX_PACKETS_PER_ITERATION) {
1222 // dont sleep; there is likely to be more data to read
1223 ca->wakeup = 1;
1224 break;
1225 }
1226 }
1227 break;
1228 }
1229
1230 mutex_unlock(&ca->slot_info[slot].slot_lock);
1231 }
1232 }
1233
1234 return 0;
1235 }
1236
1237
1238
1239 /* ******************************************************************************** */
1240 /* EN50221 IO interface functions */
1241
1242 /**
1243 * Real ioctl implementation.
1244 * NOTE: CA_SEND_MSG/CA_GET_MSG ioctls have userspace buffers passed to them.
1245 *
1246 * @inode: Inode concerned.
1247 * @file: File concerned.
1248 * @cmd: IOCTL command.
1249 * @arg: Associated argument.
1250 *
1251 * @return 0 on success, <0 on error.
1252 */
1253 static int dvb_ca_en50221_io_do_ioctl(struct file *file,
1254 unsigned int cmd, void *parg)
1255 {
1256 struct dvb_device *dvbdev = file->private_data;
1257 struct dvb_ca_private *ca = dvbdev->priv;
1258 int err = 0;
1259 int slot;
1260
1261 dprintk("%s\n", __func__);
1262
1263 if (mutex_lock_interruptible(&ca->ioctl_mutex))
1264 return -ERESTARTSYS;
1265
1266 switch (cmd) {
1267 case CA_RESET:
1268 for (slot = 0; slot < ca->slot_count; slot++) {
1269 mutex_lock(&ca->slot_info[slot].slot_lock);
1270 if (ca->slot_info[slot].slot_state != DVB_CA_SLOTSTATE_NONE) {
1271 dvb_ca_en50221_slot_shutdown(ca, slot);
1272 if (ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE)
1273 dvb_ca_en50221_camchange_irq(ca->pub,
1274 slot,
1275 DVB_CA_EN50221_CAMCHANGE_INSERTED);
1276 }
1277 mutex_unlock(&ca->slot_info[slot].slot_lock);
1278 }
1279 ca->next_read_slot = 0;
1280 dvb_ca_en50221_thread_wakeup(ca);
1281 break;
1282
1283 case CA_GET_CAP: {
1284 struct ca_caps *caps = parg;
1285
1286 caps->slot_num = ca->slot_count;
1287 caps->slot_type = CA_CI_LINK;
1288 caps->descr_num = 0;
1289 caps->descr_type = 0;
1290 break;
1291 }
1292
1293 case CA_GET_SLOT_INFO: {
1294 struct ca_slot_info *info = parg;
1295
1296 if ((info->num > ca->slot_count) || (info->num < 0)) {
1297 err = -EINVAL;
1298 goto out_unlock;
1299 }
1300
1301 info->type = CA_CI_LINK;
1302 info->flags = 0;
1303 if ((ca->slot_info[info->num].slot_state != DVB_CA_SLOTSTATE_NONE)
1304 && (ca->slot_info[info->num].slot_state != DVB_CA_SLOTSTATE_INVALID)) {
1305 info->flags = CA_CI_MODULE_PRESENT;
1306 }
1307 if (ca->slot_info[info->num].slot_state == DVB_CA_SLOTSTATE_RUNNING) {
1308 info->flags |= CA_CI_MODULE_READY;
1309 }
1310 break;
1311 }
1312
1313 default:
1314 err = -EINVAL;
1315 break;
1316 }
1317
1318 out_unlock:
1319 mutex_unlock(&ca->ioctl_mutex);
1320 return err;
1321 }
1322
1323
1324 /**
1325 * Wrapper for ioctl implementation.
1326 *
1327 * @inode: Inode concerned.
1328 * @file: File concerned.
1329 * @cmd: IOCTL command.
1330 * @arg: Associated argument.
1331 *
1332 * @return 0 on success, <0 on error.
1333 */
1334 static long dvb_ca_en50221_io_ioctl(struct file *file,
1335 unsigned int cmd, unsigned long arg)
1336 {
1337 return dvb_usercopy(file, cmd, arg, dvb_ca_en50221_io_do_ioctl);
1338 }
1339
1340
1341 /**
1342 * Implementation of write() syscall.
1343 *
1344 * @file: File structure.
1345 * @buf: Source buffer.
1346 * @count: Size of source buffer.
1347 * @ppos: Position in file (ignored).
1348 *
1349 * @return Number of bytes read, or <0 on error.
1350 */
1351 static ssize_t dvb_ca_en50221_io_write(struct file *file,
1352 const char __user *buf, size_t count,
1353 loff_t *ppos)
1354 {
1355 struct dvb_device *dvbdev = file->private_data;
1356 struct dvb_ca_private *ca = dvbdev->priv;
1357 u8 slot, connection_id;
1358 int status;
1359 u8 fragbuf[HOST_LINK_BUF_SIZE];
1360 int fragpos = 0;
1361 int fraglen;
1362 unsigned long timeout;
1363 int written;
1364
1365 dprintk("%s\n", __func__);
1366
1367 /* Incoming packet has a 2 byte header. hdr[0] = slot_id, hdr[1] = connection_id */
1368 if (count < 2)
1369 return -EINVAL;
1370
1371 /* extract slot & connection id */
1372 if (copy_from_user(&slot, buf, 1))
1373 return -EFAULT;
1374 if (copy_from_user(&connection_id, buf + 1, 1))
1375 return -EFAULT;
1376 buf += 2;
1377 count -= 2;
1378
1379 /* check if the slot is actually running */
1380 if (ca->slot_info[slot].slot_state != DVB_CA_SLOTSTATE_RUNNING)
1381 return -EINVAL;
1382
1383 /* fragment the packets & store in the buffer */
1384 while (fragpos < count) {
1385 fraglen = ca->slot_info[slot].link_buf_size - 2;
1386 if (fraglen < 0)
1387 break;
1388 if (fraglen > HOST_LINK_BUF_SIZE - 2)
1389 fraglen = HOST_LINK_BUF_SIZE - 2;
1390 if ((count - fragpos) < fraglen)
1391 fraglen = count - fragpos;
1392
1393 fragbuf[0] = connection_id;
1394 fragbuf[1] = ((fragpos + fraglen) < count) ? 0x80 : 0x00;
1395 status = copy_from_user(fragbuf + 2, buf + fragpos, fraglen);
1396 if (status) {
1397 status = -EFAULT;
1398 goto exit;
1399 }
1400
1401 timeout = jiffies + HZ / 2;
1402 written = 0;
1403 while (!time_after(jiffies, timeout)) {
1404 /* check the CAM hasn't been removed/reset in the meantime */
1405 if (ca->slot_info[slot].slot_state != DVB_CA_SLOTSTATE_RUNNING) {
1406 status = -EIO;
1407 goto exit;
1408 }
1409
1410 mutex_lock(&ca->slot_info[slot].slot_lock);
1411 status = dvb_ca_en50221_write_data(ca, slot, fragbuf, fraglen + 2);
1412 mutex_unlock(&ca->slot_info[slot].slot_lock);
1413 if (status == (fraglen + 2)) {
1414 written = 1;
1415 break;
1416 }
1417 if (status != -EAGAIN)
1418 goto exit;
1419
1420 msleep(1);
1421 }
1422 if (!written) {
1423 status = -EIO;
1424 goto exit;
1425 }
1426
1427 fragpos += fraglen;
1428 }
1429 status = count + 2;
1430
1431 exit:
1432 return status;
1433 }
1434
1435
1436 /**
1437 * Condition for waking up in dvb_ca_en50221_io_read_condition
1438 */
1439 static int dvb_ca_en50221_io_read_condition(struct dvb_ca_private *ca,
1440 int *result, int *_slot)
1441 {
1442 int slot;
1443 int slot_count = 0;
1444 int idx;
1445 size_t fraglen;
1446 int connection_id = -1;
1447 int found = 0;
1448 u8 hdr[2];
1449
1450 slot = ca->next_read_slot;
1451 while ((slot_count < ca->slot_count) && (!found)) {
1452 if (ca->slot_info[slot].slot_state != DVB_CA_SLOTSTATE_RUNNING)
1453 goto nextslot;
1454
1455 if (ca->slot_info[slot].rx_buffer.data == NULL) {
1456 return 0;
1457 }
1458
1459 idx = dvb_ringbuffer_pkt_next(&ca->slot_info[slot].rx_buffer, -1, &fraglen);
1460 while (idx != -1) {
1461 dvb_ringbuffer_pkt_read(&ca->slot_info[slot].rx_buffer, idx, 0, hdr, 2);
1462 if (connection_id == -1)
1463 connection_id = hdr[0];
1464 if ((hdr[0] == connection_id) && ((hdr[1] & 0x80) == 0)) {
1465 *_slot = slot;
1466 found = 1;
1467 break;
1468 }
1469
1470 idx = dvb_ringbuffer_pkt_next(&ca->slot_info[slot].rx_buffer, idx, &fraglen);
1471 }
1472
1473 nextslot:
1474 slot = (slot + 1) % ca->slot_count;
1475 slot_count++;
1476 }
1477
1478 ca->next_read_slot = slot;
1479 return found;
1480 }
1481
1482
1483 /**
1484 * Implementation of read() syscall.
1485 *
1486 * @file: File structure.
1487 * @buf: Destination buffer.
1488 * @count: Size of destination buffer.
1489 * @ppos: Position in file (ignored).
1490 *
1491 * @return Number of bytes read, or <0 on error.
1492 */
1493 static ssize_t dvb_ca_en50221_io_read(struct file *file, char __user *buf,
1494 size_t count, loff_t *ppos)
1495 {
1496 struct dvb_device *dvbdev = file->private_data;
1497 struct dvb_ca_private *ca = dvbdev->priv;
1498 int status;
1499 int result = 0;
1500 u8 hdr[2];
1501 int slot;
1502 int connection_id = -1;
1503 size_t idx, idx2;
1504 int last_fragment = 0;
1505 size_t fraglen;
1506 int pktlen;
1507 int dispose = 0;
1508
1509 dprintk("%s\n", __func__);
1510
1511 /* Outgoing packet has a 2 byte header. hdr[0] = slot_id, hdr[1] = connection_id */
1512 if (count < 2)
1513 return -EINVAL;
1514
1515 /* wait for some data */
1516 if ((status = dvb_ca_en50221_io_read_condition(ca, &result, &slot)) == 0) {
1517
1518 /* if we're in nonblocking mode, exit immediately */
1519 if (file->f_flags & O_NONBLOCK)
1520 return -EWOULDBLOCK;
1521
1522 /* wait for some data */
1523 status = wait_event_interruptible(ca->wait_queue,
1524 dvb_ca_en50221_io_read_condition
1525 (ca, &result, &slot));
1526 }
1527 if ((status < 0) || (result < 0)) {
1528 if (result)
1529 return result;
1530 return status;
1531 }
1532
1533 idx = dvb_ringbuffer_pkt_next(&ca->slot_info[slot].rx_buffer, -1, &fraglen);
1534 pktlen = 2;
1535 do {
1536 if (idx == -1) {
1537 pr_err("dvb_ca adapter %d: BUG: read packet ended before last_fragment encountered\n",
1538 ca->dvbdev->adapter->num);
1539 status = -EIO;
1540 goto exit;
1541 }
1542
1543 dvb_ringbuffer_pkt_read(&ca->slot_info[slot].rx_buffer, idx, 0, hdr, 2);
1544 if (connection_id == -1)
1545 connection_id = hdr[0];
1546 if (hdr[0] == connection_id) {
1547 if (pktlen < count) {
1548 if ((pktlen + fraglen - 2) > count) {
1549 fraglen = count - pktlen;
1550 } else {
1551 fraglen -= 2;
1552 }
1553
1554 if ((status = dvb_ringbuffer_pkt_read_user(&ca->slot_info[slot].rx_buffer, idx, 2,
1555 buf + pktlen, fraglen)) < 0) {
1556 goto exit;
1557 }
1558 pktlen += fraglen;
1559 }
1560
1561 if ((hdr[1] & 0x80) == 0)
1562 last_fragment = 1;
1563 dispose = 1;
1564 }
1565
1566 idx2 = dvb_ringbuffer_pkt_next(&ca->slot_info[slot].rx_buffer, idx, &fraglen);
1567 if (dispose)
1568 dvb_ringbuffer_pkt_dispose(&ca->slot_info[slot].rx_buffer, idx);
1569 idx = idx2;
1570 dispose = 0;
1571 } while (!last_fragment);
1572
1573 hdr[0] = slot;
1574 hdr[1] = connection_id;
1575 status = copy_to_user(buf, hdr, 2);
1576 if (status) {
1577 status = -EFAULT;
1578 goto exit;
1579 }
1580 status = pktlen;
1581
1582 exit:
1583 return status;
1584 }
1585
1586
1587 /**
1588 * Implementation of file open syscall.
1589 *
1590 * @inode: Inode concerned.
1591 * @file: File concerned.
1592 *
1593 * @return 0 on success, <0 on failure.
1594 */
1595 static int dvb_ca_en50221_io_open(struct inode *inode, struct file *file)
1596 {
1597 struct dvb_device *dvbdev = file->private_data;
1598 struct dvb_ca_private *ca = dvbdev->priv;
1599 int err;
1600 int i;
1601
1602 dprintk("%s\n", __func__);
1603
1604 if (!try_module_get(ca->pub->owner))
1605 return -EIO;
1606
1607 err = dvb_generic_open(inode, file);
1608 if (err < 0) {
1609 module_put(ca->pub->owner);
1610 return err;
1611 }
1612
1613 for (i = 0; i < ca->slot_count; i++) {
1614
1615 if (ca->slot_info[i].slot_state == DVB_CA_SLOTSTATE_RUNNING) {
1616 if (ca->slot_info[i].rx_buffer.data != NULL) {
1617 /* it is safe to call this here without locks because
1618 * ca->open == 0. Data is not read in this case */
1619 dvb_ringbuffer_flush(&ca->slot_info[i].rx_buffer);
1620 }
1621 }
1622 }
1623
1624 ca->open = 1;
1625 dvb_ca_en50221_thread_update_delay(ca);
1626 dvb_ca_en50221_thread_wakeup(ca);
1627
1628 dvb_ca_private_get(ca);
1629
1630 return 0;
1631 }
1632
1633
1634 /**
1635 * Implementation of file close syscall.
1636 *
1637 * @inode: Inode concerned.
1638 * @file: File concerned.
1639 *
1640 * @return 0 on success, <0 on failure.
1641 */
1642 static int dvb_ca_en50221_io_release(struct inode *inode, struct file *file)
1643 {
1644 struct dvb_device *dvbdev = file->private_data;
1645 struct dvb_ca_private *ca = dvbdev->priv;
1646 int err;
1647
1648 dprintk("%s\n", __func__);
1649
1650 /* mark the CA device as closed */
1651 ca->open = 0;
1652 dvb_ca_en50221_thread_update_delay(ca);
1653
1654 err = dvb_generic_release(inode, file);
1655
1656 module_put(ca->pub->owner);
1657
1658 dvb_ca_private_put(ca);
1659
1660 return err;
1661 }
1662
1663
1664 /**
1665 * Implementation of poll() syscall.
1666 *
1667 * @file: File concerned.
1668 * @wait: poll wait table.
1669 *
1670 * @return Standard poll mask.
1671 */
1672 static unsigned int dvb_ca_en50221_io_poll(struct file *file, poll_table *wait)
1673 {
1674 struct dvb_device *dvbdev = file->private_data;
1675 struct dvb_ca_private *ca = dvbdev->priv;
1676 unsigned int mask = 0;
1677 int slot;
1678 int result = 0;
1679
1680 dprintk("%s\n", __func__);
1681
1682 if (dvb_ca_en50221_io_read_condition(ca, &result, &slot) == 1) {
1683 mask |= POLLIN;
1684 }
1685
1686 /* if there is something, return now */
1687 if (mask)
1688 return mask;
1689
1690 /* wait for something to happen */
1691 poll_wait(file, &ca->wait_queue, wait);
1692
1693 if (dvb_ca_en50221_io_read_condition(ca, &result, &slot) == 1) {
1694 mask |= POLLIN;
1695 }
1696
1697 return mask;
1698 }
1699 EXPORT_SYMBOL(dvb_ca_en50221_init);
1700
1701
1702 static const struct file_operations dvb_ca_fops = {
1703 .owner = THIS_MODULE,
1704 .read = dvb_ca_en50221_io_read,
1705 .write = dvb_ca_en50221_io_write,
1706 .unlocked_ioctl = dvb_ca_en50221_io_ioctl,
1707 .open = dvb_ca_en50221_io_open,
1708 .release = dvb_ca_en50221_io_release,
1709 .poll = dvb_ca_en50221_io_poll,
1710 .llseek = noop_llseek,
1711 };
1712
1713 static const struct dvb_device dvbdev_ca = {
1714 .priv = NULL,
1715 .users = 1,
1716 .readers = 1,
1717 .writers = 1,
1718 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
1719 .name = "dvb-ca-en50221",
1720 #endif
1721 .fops = &dvb_ca_fops,
1722 };
1723
1724 /* ******************************************************************************** */
1725 /* Initialisation/shutdown functions */
1726
1727
1728 /**
1729 * Initialise a new DVB CA EN50221 interface device.
1730 *
1731 * @dvb_adapter: DVB adapter to attach the new CA device to.
1732 * @ca: The dvb_ca instance.
1733 * @flags: Flags describing the CA device (DVB_CA_FLAG_*).
1734 * @slot_count: Number of slots supported.
1735 *
1736 * @return 0 on success, nonzero on failure
1737 */
1738 int dvb_ca_en50221_init(struct dvb_adapter *dvb_adapter,
1739 struct dvb_ca_en50221 *pubca, int flags, int slot_count)
1740 {
1741 int ret;
1742 struct dvb_ca_private *ca = NULL;
1743 int i;
1744
1745 dprintk("%s\n", __func__);
1746
1747 if (slot_count < 1)
1748 return -EINVAL;
1749
1750 /* initialise the system data */
1751 if ((ca = kzalloc(sizeof(struct dvb_ca_private), GFP_KERNEL)) == NULL) {
1752 ret = -ENOMEM;
1753 goto exit;
1754 }
1755 kref_init(&ca->refcount);
1756 ca->pub = pubca;
1757 ca->flags = flags;
1758 ca->slot_count = slot_count;
1759 if ((ca->slot_info = kcalloc(slot_count, sizeof(struct dvb_ca_slot), GFP_KERNEL)) == NULL) {
1760 ret = -ENOMEM;
1761 goto free_ca;
1762 }
1763 init_waitqueue_head(&ca->wait_queue);
1764 ca->open = 0;
1765 ca->wakeup = 0;
1766 ca->next_read_slot = 0;
1767 pubca->private = ca;
1768
1769 /* register the DVB device */
1770 ret = dvb_register_device(dvb_adapter, &ca->dvbdev, &dvbdev_ca, ca, DVB_DEVICE_CA, 0);
1771 if (ret)
1772 goto free_slot_info;
1773
1774 /* now initialise each slot */
1775 for (i = 0; i < slot_count; i++) {
1776 memset(&ca->slot_info[i], 0, sizeof(struct dvb_ca_slot));
1777 ca->slot_info[i].slot_state = DVB_CA_SLOTSTATE_NONE;
1778 atomic_set(&ca->slot_info[i].camchange_count, 0);
1779 ca->slot_info[i].camchange_type = DVB_CA_EN50221_CAMCHANGE_REMOVED;
1780 mutex_init(&ca->slot_info[i].slot_lock);
1781 }
1782
1783 mutex_init(&ca->ioctl_mutex);
1784
1785 if (signal_pending(current)) {
1786 ret = -EINTR;
1787 goto unregister_device;
1788 }
1789 mb();
1790
1791 /* create a kthread for monitoring this CA device */
1792 ca->thread = kthread_run(dvb_ca_en50221_thread, ca, "kdvb-ca-%i:%i",
1793 ca->dvbdev->adapter->num, ca->dvbdev->id);
1794 if (IS_ERR(ca->thread)) {
1795 ret = PTR_ERR(ca->thread);
1796 pr_err("dvb_ca_init: failed to start kernel_thread (%d)\n",
1797 ret);
1798 goto unregister_device;
1799 }
1800 return 0;
1801
1802 unregister_device:
1803 dvb_unregister_device(ca->dvbdev);
1804 free_slot_info:
1805 kfree(ca->slot_info);
1806 free_ca:
1807 kfree(ca);
1808 exit:
1809 pubca->private = NULL;
1810 return ret;
1811 }
1812 EXPORT_SYMBOL(dvb_ca_en50221_release);
1813
1814
1815
1816 /**
1817 * Release a DVB CA EN50221 interface device.
1818 *
1819 * @ca_dev: The dvb_device_t instance for the CA device.
1820 * @ca: The associated dvb_ca instance.
1821 */
1822 void dvb_ca_en50221_release(struct dvb_ca_en50221 *pubca)
1823 {
1824 struct dvb_ca_private *ca = pubca->private;
1825 int i;
1826
1827 dprintk("%s\n", __func__);
1828
1829 /* shutdown the thread if there was one */
1830 kthread_stop(ca->thread);
1831
1832 for (i = 0; i < ca->slot_count; i++) {
1833 dvb_ca_en50221_slot_shutdown(ca, i);
1834 }
1835 dvb_remove_device(ca->dvbdev);
1836 dvb_ca_private_put(ca);
1837 pubca->private = NULL;
1838 }
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