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Merge tag 'for-linus-20170825' of git://git.infradead.org/linux-mtd
[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 ret = dvb_ca_en50221_wait_if_status(ca, slot, STATUSREG_DA, HZ);
353 if (ret != 0)
354 return ret;
355 if ((ret = dvb_ca_en50221_read_data(ca, slot, buf, 2)) != 2)
356 return -EIO;
357 if ((ret = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, IRQEN)) != 0)
358 return ret;
359
360 /* store it, and choose the minimum of our buffer and the CAM's buffer size */
361 buf_size = (buf[0] << 8) | buf[1];
362 if (buf_size > HOST_LINK_BUF_SIZE)
363 buf_size = HOST_LINK_BUF_SIZE;
364 ca->slot_info[slot].link_buf_size = buf_size;
365 buf[0] = buf_size >> 8;
366 buf[1] = buf_size & 0xff;
367 dprintk("Chosen link buffer size of %i\n", buf_size);
368
369 /* write the buffer size to the CAM */
370 if ((ret = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, IRQEN | CMDREG_SW)) != 0)
371 return ret;
372 if ((ret = dvb_ca_en50221_wait_if_status(ca, slot, STATUSREG_FR, HZ / 10)) != 0)
373 return ret;
374 if ((ret = dvb_ca_en50221_write_data(ca, slot, buf, 2)) != 2)
375 return -EIO;
376 if ((ret = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, IRQEN)) != 0)
377 return ret;
378
379 /* success */
380 return 0;
381 }
382
383 /**
384 * dvb_ca_en50221_read_tuple - Read a tuple from attribute memory.
385 *
386 * @ca: CA instance.
387 * @slot: Slot id.
388 * @address: Address to read from. Updated.
389 * @tupleType: Tuple id byte. Updated.
390 * @tupleLength: Tuple length. Updated.
391 * @tuple: Dest buffer for tuple (must be 256 bytes). Updated.
392 *
393 * @return 0 on success, nonzero on error.
394 */
395 static int dvb_ca_en50221_read_tuple(struct dvb_ca_private *ca, int slot,
396 int *address, int *tupleType,
397 int *tupleLength, u8 *tuple)
398 {
399 int i;
400 int _tupleType;
401 int _tupleLength;
402 int _address = *address;
403
404 /* grab the next tuple length and type */
405 if ((_tupleType = ca->pub->read_attribute_mem(ca->pub, slot, _address)) < 0)
406 return _tupleType;
407 if (_tupleType == 0xff) {
408 dprintk("END OF CHAIN TUPLE type:0x%x\n", _tupleType);
409 *address += 2;
410 *tupleType = _tupleType;
411 *tupleLength = 0;
412 return 0;
413 }
414 if ((_tupleLength = ca->pub->read_attribute_mem(ca->pub, slot, _address + 2)) < 0)
415 return _tupleLength;
416 _address += 4;
417
418 dprintk("TUPLE type:0x%x length:%i\n", _tupleType, _tupleLength);
419
420 /* read in the whole tuple */
421 for (i = 0; i < _tupleLength; i++) {
422 tuple[i] = ca->pub->read_attribute_mem(ca->pub, slot, _address + (i * 2));
423 dprintk(" 0x%02x: 0x%02x %c\n",
424 i, tuple[i] & 0xff,
425 ((tuple[i] > 31) && (tuple[i] < 127)) ? tuple[i] : '.');
426 }
427 _address += (_tupleLength * 2);
428
429 // success
430 *tupleType = _tupleType;
431 *tupleLength = _tupleLength;
432 *address = _address;
433 return 0;
434 }
435
436
437 /**
438 * dvb_ca_en50221_parse_attributes - Parse attribute memory of a CAM module,
439 * extracting Config register, and checking it is a DVB CAM module.
440 *
441 * @ca: CA instance.
442 * @slot: Slot id.
443 *
444 * @return 0 on success, <0 on failure.
445 */
446 static int dvb_ca_en50221_parse_attributes(struct dvb_ca_private *ca, int slot)
447 {
448 int address = 0;
449 int tupleLength;
450 int tupleType;
451 u8 tuple[257];
452 char *dvb_str;
453 int rasz;
454 int status;
455 int got_cftableentry = 0;
456 int end_chain = 0;
457 int i;
458 u16 manfid = 0;
459 u16 devid = 0;
460
461
462 // CISTPL_DEVICE_0A
463 if ((status =
464 dvb_ca_en50221_read_tuple(ca, slot, &address, &tupleType, &tupleLength, tuple)) < 0)
465 return status;
466 if (tupleType != 0x1D)
467 return -EINVAL;
468
469
470
471 // CISTPL_DEVICE_0C
472 if ((status =
473 dvb_ca_en50221_read_tuple(ca, slot, &address, &tupleType, &tupleLength, tuple)) < 0)
474 return status;
475 if (tupleType != 0x1C)
476 return -EINVAL;
477
478
479
480 // CISTPL_VERS_1
481 if ((status =
482 dvb_ca_en50221_read_tuple(ca, slot, &address, &tupleType, &tupleLength, tuple)) < 0)
483 return status;
484 if (tupleType != 0x15)
485 return -EINVAL;
486
487
488
489 // CISTPL_MANFID
490 if ((status = dvb_ca_en50221_read_tuple(ca, slot, &address, &tupleType,
491 &tupleLength, tuple)) < 0)
492 return status;
493 if (tupleType != 0x20)
494 return -EINVAL;
495 if (tupleLength != 4)
496 return -EINVAL;
497 manfid = (tuple[1] << 8) | tuple[0];
498 devid = (tuple[3] << 8) | tuple[2];
499
500
501
502 // CISTPL_CONFIG
503 if ((status = dvb_ca_en50221_read_tuple(ca, slot, &address, &tupleType,
504 &tupleLength, tuple)) < 0)
505 return status;
506 if (tupleType != 0x1A)
507 return -EINVAL;
508 if (tupleLength < 3)
509 return -EINVAL;
510
511 /* extract the configbase */
512 rasz = tuple[0] & 3;
513 if (tupleLength < (3 + rasz + 14))
514 return -EINVAL;
515 ca->slot_info[slot].config_base = 0;
516 for (i = 0; i < rasz + 1; i++) {
517 ca->slot_info[slot].config_base |= (tuple[2 + i] << (8 * i));
518 }
519
520 /* check it contains the correct DVB string */
521 dvb_str = findstr((char *)tuple, tupleLength, "DVB_CI_V", 8);
522 if (dvb_str == NULL)
523 return -EINVAL;
524 if (tupleLength < ((dvb_str - (char *) tuple) + 12))
525 return -EINVAL;
526
527 /* is it a version we support? */
528 if (strncmp(dvb_str + 8, "1.00", 4)) {
529 pr_err("dvb_ca adapter %d: Unsupported DVB CAM module version %c%c%c%c\n",
530 ca->dvbdev->adapter->num, dvb_str[8], dvb_str[9],
531 dvb_str[10], dvb_str[11]);
532 return -EINVAL;
533 }
534
535 /* process the CFTABLE_ENTRY tuples, and any after those */
536 while ((!end_chain) && (address < 0x1000)) {
537 if ((status = dvb_ca_en50221_read_tuple(ca, slot, &address, &tupleType,
538 &tupleLength, tuple)) < 0)
539 return status;
540 switch (tupleType) {
541 case 0x1B: // CISTPL_CFTABLE_ENTRY
542 if (tupleLength < (2 + 11 + 17))
543 break;
544
545 /* if we've already parsed one, just use it */
546 if (got_cftableentry)
547 break;
548
549 /* get the config option */
550 ca->slot_info[slot].config_option = tuple[0] & 0x3f;
551
552 /* OK, check it contains the correct strings */
553 if ((findstr((char *)tuple, tupleLength, "DVB_HOST", 8) == NULL) ||
554 (findstr((char *)tuple, tupleLength, "DVB_CI_MODULE", 13) == NULL))
555 break;
556
557 got_cftableentry = 1;
558 break;
559
560 case 0x14: // CISTPL_NO_LINK
561 break;
562
563 case 0xFF: // CISTPL_END
564 end_chain = 1;
565 break;
566
567 default: /* Unknown tuple type - just skip this tuple and move to the next one */
568 dprintk("dvb_ca: Skipping unknown tuple type:0x%x length:0x%x\n",
569 tupleType, tupleLength);
570 break;
571 }
572 }
573
574 if ((address > 0x1000) || (!got_cftableentry))
575 return -EINVAL;
576
577 dprintk("Valid DVB CAM detected MANID:%x DEVID:%x CONFIGBASE:0x%x CONFIGOPTION:0x%x\n",
578 manfid, devid, ca->slot_info[slot].config_base,
579 ca->slot_info[slot].config_option);
580
581 // success!
582 return 0;
583 }
584
585
586 /**
587 * dvb_ca_en50221_set_configoption - Set CAM's configoption correctly.
588 *
589 * @ca: CA instance.
590 * @slot: Slot containing the CAM.
591 */
592 static int dvb_ca_en50221_set_configoption(struct dvb_ca_private *ca, int slot)
593 {
594 int configoption;
595
596 dprintk("%s\n", __func__);
597
598 /* set the config option */
599 ca->pub->write_attribute_mem(ca->pub, slot,
600 ca->slot_info[slot].config_base,
601 ca->slot_info[slot].config_option);
602
603 /* check it */
604 configoption = ca->pub->read_attribute_mem(ca->pub, slot, ca->slot_info[slot].config_base);
605 dprintk("Set configoption 0x%x, read configoption 0x%x\n",
606 ca->slot_info[slot].config_option, configoption & 0x3f);
607
608 /* fine! */
609 return 0;
610
611 }
612
613
614 /**
615 * dvb_ca_en50221_read_data - This function talks to an EN50221 CAM control
616 * interface. It reads a buffer of data from the CAM. The data can either
617 * be stored in a supplied buffer, or automatically be added to the slot's
618 * rx_buffer.
619 *
620 * @ca: CA instance.
621 * @slot: Slot to read from.
622 * @ebuf: If non-NULL, the data will be written to this buffer. If NULL,
623 * the data will be added into the buffering system as a normal fragment.
624 * @ecount: Size of ebuf. Ignored if ebuf is NULL.
625 *
626 * @return Number of bytes read, or < 0 on error
627 */
628 static int dvb_ca_en50221_read_data(struct dvb_ca_private *ca, int slot,
629 u8 *ebuf, int ecount)
630 {
631 int bytes_read;
632 int status;
633 u8 buf[HOST_LINK_BUF_SIZE];
634 int i;
635
636 dprintk("%s\n", __func__);
637
638 /* check if we have space for a link buf in the rx_buffer */
639 if (ebuf == NULL) {
640 int buf_free;
641
642 if (ca->slot_info[slot].rx_buffer.data == NULL) {
643 status = -EIO;
644 goto exit;
645 }
646 buf_free = dvb_ringbuffer_free(&ca->slot_info[slot].rx_buffer);
647
648 if (buf_free < (ca->slot_info[slot].link_buf_size +
649 DVB_RINGBUFFER_PKTHDRSIZE)) {
650 status = -EAGAIN;
651 goto exit;
652 }
653 }
654
655 if (ca->pub->read_data &&
656 (ca->slot_info[slot].slot_state != DVB_CA_SLOTSTATE_LINKINIT)) {
657 if (ebuf == NULL)
658 status = ca->pub->read_data(ca->pub, slot, buf,
659 sizeof(buf));
660 else
661 status = ca->pub->read_data(ca->pub, slot, buf, ecount);
662 if (status < 0)
663 return status;
664 bytes_read = status;
665 if (status == 0)
666 goto exit;
667 } else {
668
669 /* check if there is data available */
670 status = ca->pub->read_cam_control(ca->pub, slot,
671 CTRLIF_STATUS);
672 if (status < 0)
673 goto exit;
674 if (!(status & STATUSREG_DA)) {
675 /* no data */
676 status = 0;
677 goto exit;
678 }
679
680 /* read the amount of data */
681 status = ca->pub->read_cam_control(ca->pub, slot,
682 CTRLIF_SIZE_HIGH);
683 if (status < 0)
684 goto exit;
685 bytes_read = status << 8;
686 status = ca->pub->read_cam_control(ca->pub, slot,
687 CTRLIF_SIZE_LOW);
688 if (status < 0)
689 goto exit;
690 bytes_read |= status;
691
692 /* check it will fit */
693 if (ebuf == NULL) {
694 if (bytes_read > ca->slot_info[slot].link_buf_size) {
695 pr_err("dvb_ca adapter %d: CAM tried to send a buffer larger than the link buffer size (%i > %i)!\n",
696 ca->dvbdev->adapter->num, bytes_read,
697 ca->slot_info[slot].link_buf_size);
698 ca->slot_info[slot].slot_state =
699 DVB_CA_SLOTSTATE_LINKINIT;
700 status = -EIO;
701 goto exit;
702 }
703 if (bytes_read < 2) {
704 pr_err("dvb_ca adapter %d: CAM sent a buffer that was less than 2 bytes!\n",
705 ca->dvbdev->adapter->num);
706 ca->slot_info[slot].slot_state =
707 DVB_CA_SLOTSTATE_LINKINIT;
708 status = -EIO;
709 goto exit;
710 }
711 } else {
712 if (bytes_read > ecount) {
713 pr_err("dvb_ca adapter %d: CAM tried to send a buffer larger than the ecount size!\n",
714 ca->dvbdev->adapter->num);
715 status = -EIO;
716 goto exit;
717 }
718 }
719
720 /* fill the buffer */
721 for (i = 0; i < bytes_read; i++) {
722 /* read byte and check */
723 status = ca->pub->read_cam_control(ca->pub, slot,
724 CTRLIF_DATA);
725 if (status < 0)
726 goto exit;
727
728 /* OK, store it in the buffer */
729 buf[i] = status;
730 }
731
732 /* check for read error (RE should now be 0) */
733 status = ca->pub->read_cam_control(ca->pub, slot,
734 CTRLIF_STATUS);
735 if (status < 0)
736 goto exit;
737 if (status & STATUSREG_RE) {
738 ca->slot_info[slot].slot_state =
739 DVB_CA_SLOTSTATE_LINKINIT;
740 status = -EIO;
741 goto exit;
742 }
743 }
744
745 /* OK, add it to the receive buffer, or copy into external buffer if supplied */
746 if (ebuf == NULL) {
747 if (ca->slot_info[slot].rx_buffer.data == NULL) {
748 status = -EIO;
749 goto exit;
750 }
751 dvb_ringbuffer_pkt_write(&ca->slot_info[slot].rx_buffer, buf, bytes_read);
752 } else {
753 memcpy(ebuf, buf, bytes_read);
754 }
755
756 dprintk("Received CA packet for slot %i connection id 0x%x last_frag:%i size:0x%x\n", slot,
757 buf[0], (buf[1] & 0x80) == 0, bytes_read);
758
759 /* wake up readers when a last_fragment is received */
760 if ((buf[1] & 0x80) == 0x00) {
761 wake_up_interruptible(&ca->wait_queue);
762 }
763 status = bytes_read;
764
765 exit:
766 return status;
767 }
768
769
770 /**
771 * dvb_ca_en50221_write_data - This function talks to an EN50221 CAM control
772 * interface. It writes a buffer of data to a CAM.
773 *
774 * @ca: CA instance.
775 * @slot: Slot to write to.
776 * @ebuf: The data in this buffer is treated as a complete link-level packet to
777 * be written.
778 * @count: Size of ebuf.
779 *
780 * @return Number of bytes written, or < 0 on error.
781 */
782 static int dvb_ca_en50221_write_data(struct dvb_ca_private *ca, int slot,
783 u8 *buf, int bytes_write)
784 {
785 int status;
786 int i;
787
788 dprintk("%s\n", __func__);
789
790
791 /* sanity check */
792 if (bytes_write > ca->slot_info[slot].link_buf_size)
793 return -EINVAL;
794
795 if (ca->pub->write_data &&
796 (ca->slot_info[slot].slot_state != DVB_CA_SLOTSTATE_LINKINIT))
797 return ca->pub->write_data(ca->pub, slot, buf, bytes_write);
798
799 /* it is possible we are dealing with a single buffer implementation,
800 thus if there is data available for read or if there is even a read
801 already in progress, we do nothing but awake the kernel thread to
802 process the data if necessary. */
803 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS)) < 0)
804 goto exitnowrite;
805 if (status & (STATUSREG_DA | STATUSREG_RE)) {
806 if (status & STATUSREG_DA)
807 dvb_ca_en50221_thread_wakeup(ca);
808
809 status = -EAGAIN;
810 goto exitnowrite;
811 }
812
813 /* OK, set HC bit */
814 if ((status = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND,
815 IRQEN | CMDREG_HC)) != 0)
816 goto exit;
817
818 /* check if interface is still free */
819 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS)) < 0)
820 goto exit;
821 if (!(status & STATUSREG_FR)) {
822 /* it wasn't free => try again later */
823 status = -EAGAIN;
824 goto exit;
825 }
826
827 /*
828 * It may need some time for the CAM to settle down, or there might
829 * be a race condition between the CAM, writing HC and our last
830 * check for DA. This happens, if the CAM asserts DA, just after
831 * checking DA before we are setting HC. In this case it might be
832 * a bug in the CAM to keep the FR bit, the lower layer/HW
833 * communication requires a longer timeout or the CAM needs more
834 * time internally. But this happens in reality!
835 * We need to read the status from the HW again and do the same
836 * we did for the previous check for DA
837 */
838 status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS);
839 if (status < 0)
840 goto exit;
841
842 if (status & (STATUSREG_DA | STATUSREG_RE)) {
843 if (status & STATUSREG_DA)
844 dvb_ca_en50221_thread_wakeup(ca);
845
846 status = -EAGAIN;
847 goto exit;
848 }
849
850 /* send the amount of data */
851 if ((status = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_SIZE_HIGH, bytes_write >> 8)) != 0)
852 goto exit;
853 if ((status = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_SIZE_LOW,
854 bytes_write & 0xff)) != 0)
855 goto exit;
856
857 /* send the buffer */
858 for (i = 0; i < bytes_write; i++) {
859 if ((status = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_DATA, buf[i])) != 0)
860 goto exit;
861 }
862
863 /* check for write error (WE should now be 0) */
864 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS)) < 0)
865 goto exit;
866 if (status & STATUSREG_WE) {
867 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_LINKINIT;
868 status = -EIO;
869 goto exit;
870 }
871 status = bytes_write;
872
873 dprintk("Wrote CA packet for slot %i, connection id 0x%x last_frag:%i size:0x%x\n", slot,
874 buf[0], (buf[1] & 0x80) == 0, bytes_write);
875
876 exit:
877 ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, IRQEN);
878
879 exitnowrite:
880 return status;
881 }
882
883
884
885 /* ******************************************************************************** */
886 /* EN50221 higher level functions */
887
888
889 /**
890 * dvb_ca_en50221_slot_shutdown - A CAM has been removed => shut it down.
891 *
892 * @ca: CA instance.
893 * @slot: Slot to shut down.
894 */
895 static int dvb_ca_en50221_slot_shutdown(struct dvb_ca_private *ca, int slot)
896 {
897 dprintk("%s\n", __func__);
898
899 ca->pub->slot_shutdown(ca->pub, slot);
900 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_NONE;
901
902 /* need to wake up all processes to check if they're now
903 trying to write to a defunct CAM */
904 wake_up_interruptible(&ca->wait_queue);
905
906 dprintk("Slot %i shutdown\n", slot);
907
908 /* success */
909 return 0;
910 }
911
912
913 /**
914 * dvb_ca_en50221_camchange_irq - A CAMCHANGE IRQ has occurred.
915 *
916 * @ca: CA instance.
917 * @slot: Slot concerned.
918 * @change_type: One of the DVB_CA_CAMCHANGE_* values.
919 */
920 void dvb_ca_en50221_camchange_irq(struct dvb_ca_en50221 *pubca, int slot, int change_type)
921 {
922 struct dvb_ca_private *ca = pubca->private;
923
924 dprintk("CAMCHANGE IRQ slot:%i change_type:%i\n", slot, change_type);
925
926 switch (change_type) {
927 case DVB_CA_EN50221_CAMCHANGE_REMOVED:
928 case DVB_CA_EN50221_CAMCHANGE_INSERTED:
929 break;
930
931 default:
932 return;
933 }
934
935 ca->slot_info[slot].camchange_type = change_type;
936 atomic_inc(&ca->slot_info[slot].camchange_count);
937 dvb_ca_en50221_thread_wakeup(ca);
938 }
939 EXPORT_SYMBOL(dvb_ca_en50221_camchange_irq);
940
941
942 /**
943 * dvb_ca_en50221_camready_irq - A CAMREADY IRQ has occurred.
944 *
945 * @ca: CA instance.
946 * @slot: Slot concerned.
947 */
948 void dvb_ca_en50221_camready_irq(struct dvb_ca_en50221 *pubca, int slot)
949 {
950 struct dvb_ca_private *ca = pubca->private;
951
952 dprintk("CAMREADY IRQ slot:%i\n", slot);
953
954 if (ca->slot_info[slot].slot_state == DVB_CA_SLOTSTATE_WAITREADY) {
955 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_VALIDATE;
956 dvb_ca_en50221_thread_wakeup(ca);
957 }
958 }
959 EXPORT_SYMBOL(dvb_ca_en50221_camready_irq);
960
961
962 /**
963 * dvb_ca_en50221_frda_irq - An FR or DA IRQ has occurred.
964 *
965 * @ca: CA instance.
966 * @slot: Slot concerned.
967 */
968 void dvb_ca_en50221_frda_irq(struct dvb_ca_en50221 *pubca, int slot)
969 {
970 struct dvb_ca_private *ca = pubca->private;
971 int flags;
972
973 dprintk("FR/DA IRQ slot:%i\n", slot);
974
975 switch (ca->slot_info[slot].slot_state) {
976 case DVB_CA_SLOTSTATE_LINKINIT:
977 flags = ca->pub->read_cam_control(pubca, slot, CTRLIF_STATUS);
978 if (flags & STATUSREG_DA) {
979 dprintk("CAM supports DA IRQ\n");
980 ca->slot_info[slot].da_irq_supported = 1;
981 }
982 break;
983
984 case DVB_CA_SLOTSTATE_RUNNING:
985 if (ca->open)
986 dvb_ca_en50221_thread_wakeup(ca);
987 break;
988 }
989 }
990 EXPORT_SYMBOL(dvb_ca_en50221_frda_irq);
991
992
993 /* ******************************************************************************** */
994 /* EN50221 thread functions */
995
996 /**
997 * Wake up the DVB CA thread
998 *
999 * @ca: CA instance.
1000 */
1001 static void dvb_ca_en50221_thread_wakeup(struct dvb_ca_private *ca)
1002 {
1003
1004 dprintk("%s\n", __func__);
1005
1006 ca->wakeup = 1;
1007 mb();
1008 wake_up_process(ca->thread);
1009 }
1010
1011 /**
1012 * Update the delay used by the thread.
1013 *
1014 * @ca: CA instance.
1015 */
1016 static void dvb_ca_en50221_thread_update_delay(struct dvb_ca_private *ca)
1017 {
1018 int delay;
1019 int curdelay = 100000000;
1020 int slot;
1021
1022 /* Beware of too high polling frequency, because one polling
1023 * call might take several hundred milliseconds until timeout!
1024 */
1025 for (slot = 0; slot < ca->slot_count; slot++) {
1026 switch (ca->slot_info[slot].slot_state) {
1027 default:
1028 case DVB_CA_SLOTSTATE_NONE:
1029 delay = HZ * 60; /* 60s */
1030 if (!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE))
1031 delay = HZ * 5; /* 5s */
1032 break;
1033 case DVB_CA_SLOTSTATE_INVALID:
1034 delay = HZ * 60; /* 60s */
1035 if (!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE))
1036 delay = HZ / 10; /* 100ms */
1037 break;
1038
1039 case DVB_CA_SLOTSTATE_UNINITIALISED:
1040 case DVB_CA_SLOTSTATE_WAITREADY:
1041 case DVB_CA_SLOTSTATE_VALIDATE:
1042 case DVB_CA_SLOTSTATE_WAITFR:
1043 case DVB_CA_SLOTSTATE_LINKINIT:
1044 delay = HZ / 10; /* 100ms */
1045 break;
1046
1047 case DVB_CA_SLOTSTATE_RUNNING:
1048 delay = HZ * 60; /* 60s */
1049 if (!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE))
1050 delay = HZ / 10; /* 100ms */
1051 if (ca->open) {
1052 if ((!ca->slot_info[slot].da_irq_supported) ||
1053 (!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_DA)))
1054 delay = HZ / 10; /* 100ms */
1055 }
1056 break;
1057 }
1058
1059 if (delay < curdelay)
1060 curdelay = delay;
1061 }
1062
1063 ca->delay = curdelay;
1064 }
1065
1066
1067
1068 /**
1069 * Kernel thread which monitors CA slots for CAM changes, and performs data transfers.
1070 */
1071 static int dvb_ca_en50221_thread(void *data)
1072 {
1073 struct dvb_ca_private *ca = data;
1074 int slot;
1075 int flags;
1076 int status;
1077 int pktcount;
1078 void *rxbuf;
1079
1080 dprintk("%s\n", __func__);
1081
1082 /* choose the correct initial delay */
1083 dvb_ca_en50221_thread_update_delay(ca);
1084
1085 /* main loop */
1086 while (!kthread_should_stop()) {
1087 /* sleep for a bit */
1088 if (!ca->wakeup) {
1089 set_current_state(TASK_INTERRUPTIBLE);
1090 schedule_timeout(ca->delay);
1091 if (kthread_should_stop())
1092 return 0;
1093 }
1094 ca->wakeup = 0;
1095
1096 /* go through all the slots processing them */
1097 for (slot = 0; slot < ca->slot_count; slot++) {
1098
1099 mutex_lock(&ca->slot_info[slot].slot_lock);
1100
1101 // check the cam status + deal with CAMCHANGEs
1102 while (dvb_ca_en50221_check_camstatus(ca, slot)) {
1103 /* clear down an old CI slot if necessary */
1104 if (ca->slot_info[slot].slot_state != DVB_CA_SLOTSTATE_NONE)
1105 dvb_ca_en50221_slot_shutdown(ca, slot);
1106
1107 /* if a CAM is NOW present, initialise it */
1108 if (ca->slot_info[slot].camchange_type == DVB_CA_EN50221_CAMCHANGE_INSERTED) {
1109 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_UNINITIALISED;
1110 }
1111
1112 /* we've handled one CAMCHANGE */
1113 dvb_ca_en50221_thread_update_delay(ca);
1114 atomic_dec(&ca->slot_info[slot].camchange_count);
1115 }
1116
1117 // CAM state machine
1118 switch (ca->slot_info[slot].slot_state) {
1119 case DVB_CA_SLOTSTATE_NONE:
1120 case DVB_CA_SLOTSTATE_INVALID:
1121 // no action needed
1122 break;
1123
1124 case DVB_CA_SLOTSTATE_UNINITIALISED:
1125 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_WAITREADY;
1126 ca->pub->slot_reset(ca->pub, slot);
1127 ca->slot_info[slot].timeout = jiffies + (INIT_TIMEOUT_SECS * HZ);
1128 break;
1129
1130 case DVB_CA_SLOTSTATE_WAITREADY:
1131 if (time_after(jiffies, ca->slot_info[slot].timeout)) {
1132 pr_err("dvb_ca adaptor %d: PC card did not respond :(\n",
1133 ca->dvbdev->adapter->num);
1134 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID;
1135 dvb_ca_en50221_thread_update_delay(ca);
1136 break;
1137 }
1138 // no other action needed; will automatically change state when ready
1139 break;
1140
1141 case DVB_CA_SLOTSTATE_VALIDATE:
1142 if (dvb_ca_en50221_parse_attributes(ca, slot) != 0) {
1143 /* we need this extra check for annoying interfaces like the budget-av */
1144 if ((!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE)) &&
1145 (ca->pub->poll_slot_status)) {
1146 status = ca->pub->poll_slot_status(ca->pub, slot, 0);
1147 if (!(status & DVB_CA_EN50221_POLL_CAM_PRESENT)) {
1148 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_NONE;
1149 dvb_ca_en50221_thread_update_delay(ca);
1150 break;
1151 }
1152 }
1153
1154 pr_err("dvb_ca adapter %d: Invalid PC card inserted :(\n",
1155 ca->dvbdev->adapter->num);
1156 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID;
1157 dvb_ca_en50221_thread_update_delay(ca);
1158 break;
1159 }
1160 if (dvb_ca_en50221_set_configoption(ca, slot) != 0) {
1161 pr_err("dvb_ca adapter %d: Unable to initialise CAM :(\n",
1162 ca->dvbdev->adapter->num);
1163 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID;
1164 dvb_ca_en50221_thread_update_delay(ca);
1165 break;
1166 }
1167 if (ca->pub->write_cam_control(ca->pub, slot,
1168 CTRLIF_COMMAND, CMDREG_RS) != 0) {
1169 pr_err("dvb_ca adapter %d: Unable to reset CAM IF\n",
1170 ca->dvbdev->adapter->num);
1171 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID;
1172 dvb_ca_en50221_thread_update_delay(ca);
1173 break;
1174 }
1175 dprintk("DVB CAM validated successfully\n");
1176
1177 ca->slot_info[slot].timeout = jiffies + (INIT_TIMEOUT_SECS * HZ);
1178 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_WAITFR;
1179 ca->wakeup = 1;
1180 break;
1181
1182 case DVB_CA_SLOTSTATE_WAITFR:
1183 if (time_after(jiffies, ca->slot_info[slot].timeout)) {
1184 pr_err("dvb_ca adapter %d: DVB CAM did not respond :(\n",
1185 ca->dvbdev->adapter->num);
1186 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID;
1187 dvb_ca_en50221_thread_update_delay(ca);
1188 break;
1189 }
1190
1191 flags = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS);
1192 if (flags & STATUSREG_FR) {
1193 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_LINKINIT;
1194 ca->wakeup = 1;
1195 }
1196 break;
1197
1198 case DVB_CA_SLOTSTATE_LINKINIT:
1199 if (dvb_ca_en50221_link_init(ca, slot) != 0) {
1200 /* we need this extra check for annoying interfaces like the budget-av */
1201 if ((!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE)) &&
1202 (ca->pub->poll_slot_status)) {
1203 status = ca->pub->poll_slot_status(ca->pub, slot, 0);
1204 if (!(status & DVB_CA_EN50221_POLL_CAM_PRESENT)) {
1205 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_NONE;
1206 dvb_ca_en50221_thread_update_delay(ca);
1207 break;
1208 }
1209 }
1210
1211 pr_err("dvb_ca adapter %d: DVB CAM link initialisation failed :(\n",
1212 ca->dvbdev->adapter->num);
1213 ca->slot_info[slot].slot_state =
1214 DVB_CA_SLOTSTATE_UNINITIALISED;
1215 dvb_ca_en50221_thread_update_delay(ca);
1216 break;
1217 }
1218
1219 if (ca->slot_info[slot].rx_buffer.data == NULL) {
1220 rxbuf = vmalloc(RX_BUFFER_SIZE);
1221 if (rxbuf == NULL) {
1222 pr_err("dvb_ca adapter %d: Unable to allocate CAM rx buffer :(\n",
1223 ca->dvbdev->adapter->num);
1224 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID;
1225 dvb_ca_en50221_thread_update_delay(ca);
1226 break;
1227 }
1228 dvb_ringbuffer_init(&ca->slot_info[slot].rx_buffer, rxbuf, RX_BUFFER_SIZE);
1229 }
1230
1231 ca->pub->slot_ts_enable(ca->pub, slot);
1232 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_RUNNING;
1233 dvb_ca_en50221_thread_update_delay(ca);
1234 pr_err("dvb_ca adapter %d: DVB CAM detected and initialised successfully\n",
1235 ca->dvbdev->adapter->num);
1236 break;
1237
1238 case DVB_CA_SLOTSTATE_RUNNING:
1239 if (!ca->open)
1240 break;
1241
1242 // poll slots for data
1243 pktcount = 0;
1244 while ((status = dvb_ca_en50221_read_data(ca, slot, NULL, 0)) > 0) {
1245 if (!ca->open)
1246 break;
1247
1248 /* if a CAMCHANGE occurred at some point, do not do any more processing of this slot */
1249 if (dvb_ca_en50221_check_camstatus(ca, slot)) {
1250 // we dont want to sleep on the next iteration so we can handle the cam change
1251 ca->wakeup = 1;
1252 break;
1253 }
1254
1255 /* check if we've hit our limit this time */
1256 if (++pktcount >= MAX_RX_PACKETS_PER_ITERATION) {
1257 // dont sleep; there is likely to be more data to read
1258 ca->wakeup = 1;
1259 break;
1260 }
1261 }
1262 break;
1263 }
1264
1265 mutex_unlock(&ca->slot_info[slot].slot_lock);
1266 }
1267 }
1268
1269 return 0;
1270 }
1271
1272
1273
1274 /* ******************************************************************************** */
1275 /* EN50221 IO interface functions */
1276
1277 /**
1278 * Real ioctl implementation.
1279 * NOTE: CA_SEND_MSG/CA_GET_MSG ioctls have userspace buffers passed to them.
1280 *
1281 * @inode: Inode concerned.
1282 * @file: File concerned.
1283 * @cmd: IOCTL command.
1284 * @arg: Associated argument.
1285 *
1286 * @return 0 on success, <0 on error.
1287 */
1288 static int dvb_ca_en50221_io_do_ioctl(struct file *file,
1289 unsigned int cmd, void *parg)
1290 {
1291 struct dvb_device *dvbdev = file->private_data;
1292 struct dvb_ca_private *ca = dvbdev->priv;
1293 int err = 0;
1294 int slot;
1295
1296 dprintk("%s\n", __func__);
1297
1298 if (mutex_lock_interruptible(&ca->ioctl_mutex))
1299 return -ERESTARTSYS;
1300
1301 switch (cmd) {
1302 case CA_RESET:
1303 for (slot = 0; slot < ca->slot_count; slot++) {
1304 mutex_lock(&ca->slot_info[slot].slot_lock);
1305 if (ca->slot_info[slot].slot_state != DVB_CA_SLOTSTATE_NONE) {
1306 dvb_ca_en50221_slot_shutdown(ca, slot);
1307 if (ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE)
1308 dvb_ca_en50221_camchange_irq(ca->pub,
1309 slot,
1310 DVB_CA_EN50221_CAMCHANGE_INSERTED);
1311 }
1312 mutex_unlock(&ca->slot_info[slot].slot_lock);
1313 }
1314 ca->next_read_slot = 0;
1315 dvb_ca_en50221_thread_wakeup(ca);
1316 break;
1317
1318 case CA_GET_CAP: {
1319 struct ca_caps *caps = parg;
1320
1321 caps->slot_num = ca->slot_count;
1322 caps->slot_type = CA_CI_LINK;
1323 caps->descr_num = 0;
1324 caps->descr_type = 0;
1325 break;
1326 }
1327
1328 case CA_GET_SLOT_INFO: {
1329 struct ca_slot_info *info = parg;
1330
1331 if ((info->num > ca->slot_count) || (info->num < 0)) {
1332 err = -EINVAL;
1333 goto out_unlock;
1334 }
1335
1336 info->type = CA_CI_LINK;
1337 info->flags = 0;
1338 if ((ca->slot_info[info->num].slot_state != DVB_CA_SLOTSTATE_NONE)
1339 && (ca->slot_info[info->num].slot_state != DVB_CA_SLOTSTATE_INVALID)) {
1340 info->flags = CA_CI_MODULE_PRESENT;
1341 }
1342 if (ca->slot_info[info->num].slot_state == DVB_CA_SLOTSTATE_RUNNING) {
1343 info->flags |= CA_CI_MODULE_READY;
1344 }
1345 break;
1346 }
1347
1348 default:
1349 err = -EINVAL;
1350 break;
1351 }
1352
1353 out_unlock:
1354 mutex_unlock(&ca->ioctl_mutex);
1355 return err;
1356 }
1357
1358
1359 /**
1360 * Wrapper for ioctl implementation.
1361 *
1362 * @inode: Inode concerned.
1363 * @file: File concerned.
1364 * @cmd: IOCTL command.
1365 * @arg: Associated argument.
1366 *
1367 * @return 0 on success, <0 on error.
1368 */
1369 static long dvb_ca_en50221_io_ioctl(struct file *file,
1370 unsigned int cmd, unsigned long arg)
1371 {
1372 return dvb_usercopy(file, cmd, arg, dvb_ca_en50221_io_do_ioctl);
1373 }
1374
1375
1376 /**
1377 * Implementation of write() syscall.
1378 *
1379 * @file: File structure.
1380 * @buf: Source buffer.
1381 * @count: Size of source buffer.
1382 * @ppos: Position in file (ignored).
1383 *
1384 * @return Number of bytes read, or <0 on error.
1385 */
1386 static ssize_t dvb_ca_en50221_io_write(struct file *file,
1387 const char __user *buf, size_t count,
1388 loff_t *ppos)
1389 {
1390 struct dvb_device *dvbdev = file->private_data;
1391 struct dvb_ca_private *ca = dvbdev->priv;
1392 u8 slot, connection_id;
1393 int status;
1394 u8 fragbuf[HOST_LINK_BUF_SIZE];
1395 int fragpos = 0;
1396 int fraglen;
1397 unsigned long timeout;
1398 int written;
1399
1400 dprintk("%s\n", __func__);
1401
1402 /* Incoming packet has a 2 byte header. hdr[0] = slot_id, hdr[1] = connection_id */
1403 if (count < 2)
1404 return -EINVAL;
1405
1406 /* extract slot & connection id */
1407 if (copy_from_user(&slot, buf, 1))
1408 return -EFAULT;
1409 if (copy_from_user(&connection_id, buf + 1, 1))
1410 return -EFAULT;
1411 buf += 2;
1412 count -= 2;
1413
1414 /* check if the slot is actually running */
1415 if (ca->slot_info[slot].slot_state != DVB_CA_SLOTSTATE_RUNNING)
1416 return -EINVAL;
1417
1418 /* fragment the packets & store in the buffer */
1419 while (fragpos < count) {
1420 fraglen = ca->slot_info[slot].link_buf_size - 2;
1421 if (fraglen < 0)
1422 break;
1423 if (fraglen > HOST_LINK_BUF_SIZE - 2)
1424 fraglen = HOST_LINK_BUF_SIZE - 2;
1425 if ((count - fragpos) < fraglen)
1426 fraglen = count - fragpos;
1427
1428 fragbuf[0] = connection_id;
1429 fragbuf[1] = ((fragpos + fraglen) < count) ? 0x80 : 0x00;
1430 status = copy_from_user(fragbuf + 2, buf + fragpos, fraglen);
1431 if (status) {
1432 status = -EFAULT;
1433 goto exit;
1434 }
1435
1436 timeout = jiffies + HZ / 2;
1437 written = 0;
1438 while (!time_after(jiffies, timeout)) {
1439 /* check the CAM hasn't been removed/reset in the meantime */
1440 if (ca->slot_info[slot].slot_state != DVB_CA_SLOTSTATE_RUNNING) {
1441 status = -EIO;
1442 goto exit;
1443 }
1444
1445 mutex_lock(&ca->slot_info[slot].slot_lock);
1446 status = dvb_ca_en50221_write_data(ca, slot, fragbuf, fraglen + 2);
1447 mutex_unlock(&ca->slot_info[slot].slot_lock);
1448 if (status == (fraglen + 2)) {
1449 written = 1;
1450 break;
1451 }
1452 if (status != -EAGAIN)
1453 goto exit;
1454
1455 msleep(1);
1456 }
1457 if (!written) {
1458 status = -EIO;
1459 goto exit;
1460 }
1461
1462 fragpos += fraglen;
1463 }
1464 status = count + 2;
1465
1466 exit:
1467 return status;
1468 }
1469
1470
1471 /**
1472 * Condition for waking up in dvb_ca_en50221_io_read_condition
1473 */
1474 static int dvb_ca_en50221_io_read_condition(struct dvb_ca_private *ca,
1475 int *result, int *_slot)
1476 {
1477 int slot;
1478 int slot_count = 0;
1479 int idx;
1480 size_t fraglen;
1481 int connection_id = -1;
1482 int found = 0;
1483 u8 hdr[2];
1484
1485 slot = ca->next_read_slot;
1486 while ((slot_count < ca->slot_count) && (!found)) {
1487 if (ca->slot_info[slot].slot_state != DVB_CA_SLOTSTATE_RUNNING)
1488 goto nextslot;
1489
1490 if (ca->slot_info[slot].rx_buffer.data == NULL) {
1491 return 0;
1492 }
1493
1494 idx = dvb_ringbuffer_pkt_next(&ca->slot_info[slot].rx_buffer, -1, &fraglen);
1495 while (idx != -1) {
1496 dvb_ringbuffer_pkt_read(&ca->slot_info[slot].rx_buffer, idx, 0, hdr, 2);
1497 if (connection_id == -1)
1498 connection_id = hdr[0];
1499 if ((hdr[0] == connection_id) && ((hdr[1] & 0x80) == 0)) {
1500 *_slot = slot;
1501 found = 1;
1502 break;
1503 }
1504
1505 idx = dvb_ringbuffer_pkt_next(&ca->slot_info[slot].rx_buffer, idx, &fraglen);
1506 }
1507
1508 nextslot:
1509 slot = (slot + 1) % ca->slot_count;
1510 slot_count++;
1511 }
1512
1513 ca->next_read_slot = slot;
1514 return found;
1515 }
1516
1517
1518 /**
1519 * Implementation of read() syscall.
1520 *
1521 * @file: File structure.
1522 * @buf: Destination buffer.
1523 * @count: Size of destination buffer.
1524 * @ppos: Position in file (ignored).
1525 *
1526 * @return Number of bytes read, or <0 on error.
1527 */
1528 static ssize_t dvb_ca_en50221_io_read(struct file *file, char __user *buf,
1529 size_t count, loff_t *ppos)
1530 {
1531 struct dvb_device *dvbdev = file->private_data;
1532 struct dvb_ca_private *ca = dvbdev->priv;
1533 int status;
1534 int result = 0;
1535 u8 hdr[2];
1536 int slot;
1537 int connection_id = -1;
1538 size_t idx, idx2;
1539 int last_fragment = 0;
1540 size_t fraglen;
1541 int pktlen;
1542 int dispose = 0;
1543
1544 dprintk("%s\n", __func__);
1545
1546 /* Outgoing packet has a 2 byte header. hdr[0] = slot_id, hdr[1] = connection_id */
1547 if (count < 2)
1548 return -EINVAL;
1549
1550 /* wait for some data */
1551 if ((status = dvb_ca_en50221_io_read_condition(ca, &result, &slot)) == 0) {
1552
1553 /* if we're in nonblocking mode, exit immediately */
1554 if (file->f_flags & O_NONBLOCK)
1555 return -EWOULDBLOCK;
1556
1557 /* wait for some data */
1558 status = wait_event_interruptible(ca->wait_queue,
1559 dvb_ca_en50221_io_read_condition
1560 (ca, &result, &slot));
1561 }
1562 if ((status < 0) || (result < 0)) {
1563 if (result)
1564 return result;
1565 return status;
1566 }
1567
1568 idx = dvb_ringbuffer_pkt_next(&ca->slot_info[slot].rx_buffer, -1, &fraglen);
1569 pktlen = 2;
1570 do {
1571 if (idx == -1) {
1572 pr_err("dvb_ca adapter %d: BUG: read packet ended before last_fragment encountered\n",
1573 ca->dvbdev->adapter->num);
1574 status = -EIO;
1575 goto exit;
1576 }
1577
1578 dvb_ringbuffer_pkt_read(&ca->slot_info[slot].rx_buffer, idx, 0, hdr, 2);
1579 if (connection_id == -1)
1580 connection_id = hdr[0];
1581 if (hdr[0] == connection_id) {
1582 if (pktlen < count) {
1583 if ((pktlen + fraglen - 2) > count) {
1584 fraglen = count - pktlen;
1585 } else {
1586 fraglen -= 2;
1587 }
1588
1589 if ((status = dvb_ringbuffer_pkt_read_user(&ca->slot_info[slot].rx_buffer, idx, 2,
1590 buf + pktlen, fraglen)) < 0) {
1591 goto exit;
1592 }
1593 pktlen += fraglen;
1594 }
1595
1596 if ((hdr[1] & 0x80) == 0)
1597 last_fragment = 1;
1598 dispose = 1;
1599 }
1600
1601 idx2 = dvb_ringbuffer_pkt_next(&ca->slot_info[slot].rx_buffer, idx, &fraglen);
1602 if (dispose)
1603 dvb_ringbuffer_pkt_dispose(&ca->slot_info[slot].rx_buffer, idx);
1604 idx = idx2;
1605 dispose = 0;
1606 } while (!last_fragment);
1607
1608 hdr[0] = slot;
1609 hdr[1] = connection_id;
1610 status = copy_to_user(buf, hdr, 2);
1611 if (status) {
1612 status = -EFAULT;
1613 goto exit;
1614 }
1615 status = pktlen;
1616
1617 exit:
1618 return status;
1619 }
1620
1621
1622 /**
1623 * Implementation of file open syscall.
1624 *
1625 * @inode: Inode concerned.
1626 * @file: File concerned.
1627 *
1628 * @return 0 on success, <0 on failure.
1629 */
1630 static int dvb_ca_en50221_io_open(struct inode *inode, struct file *file)
1631 {
1632 struct dvb_device *dvbdev = file->private_data;
1633 struct dvb_ca_private *ca = dvbdev->priv;
1634 int err;
1635 int i;
1636
1637 dprintk("%s\n", __func__);
1638
1639 if (!try_module_get(ca->pub->owner))
1640 return -EIO;
1641
1642 err = dvb_generic_open(inode, file);
1643 if (err < 0) {
1644 module_put(ca->pub->owner);
1645 return err;
1646 }
1647
1648 for (i = 0; i < ca->slot_count; i++) {
1649
1650 if (ca->slot_info[i].slot_state == DVB_CA_SLOTSTATE_RUNNING) {
1651 if (ca->slot_info[i].rx_buffer.data != NULL) {
1652 /* it is safe to call this here without locks because
1653 * ca->open == 0. Data is not read in this case */
1654 dvb_ringbuffer_flush(&ca->slot_info[i].rx_buffer);
1655 }
1656 }
1657 }
1658
1659 ca->open = 1;
1660 dvb_ca_en50221_thread_update_delay(ca);
1661 dvb_ca_en50221_thread_wakeup(ca);
1662
1663 dvb_ca_private_get(ca);
1664
1665 return 0;
1666 }
1667
1668
1669 /**
1670 * Implementation of file close syscall.
1671 *
1672 * @inode: Inode concerned.
1673 * @file: File concerned.
1674 *
1675 * @return 0 on success, <0 on failure.
1676 */
1677 static int dvb_ca_en50221_io_release(struct inode *inode, struct file *file)
1678 {
1679 struct dvb_device *dvbdev = file->private_data;
1680 struct dvb_ca_private *ca = dvbdev->priv;
1681 int err;
1682
1683 dprintk("%s\n", __func__);
1684
1685 /* mark the CA device as closed */
1686 ca->open = 0;
1687 dvb_ca_en50221_thread_update_delay(ca);
1688
1689 err = dvb_generic_release(inode, file);
1690
1691 module_put(ca->pub->owner);
1692
1693 dvb_ca_private_put(ca);
1694
1695 return err;
1696 }
1697
1698
1699 /**
1700 * Implementation of poll() syscall.
1701 *
1702 * @file: File concerned.
1703 * @wait: poll wait table.
1704 *
1705 * @return Standard poll mask.
1706 */
1707 static unsigned int dvb_ca_en50221_io_poll(struct file *file, poll_table *wait)
1708 {
1709 struct dvb_device *dvbdev = file->private_data;
1710 struct dvb_ca_private *ca = dvbdev->priv;
1711 unsigned int mask = 0;
1712 int slot;
1713 int result = 0;
1714
1715 dprintk("%s\n", __func__);
1716
1717 if (dvb_ca_en50221_io_read_condition(ca, &result, &slot) == 1) {
1718 mask |= POLLIN;
1719 }
1720
1721 /* if there is something, return now */
1722 if (mask)
1723 return mask;
1724
1725 /* wait for something to happen */
1726 poll_wait(file, &ca->wait_queue, wait);
1727
1728 if (dvb_ca_en50221_io_read_condition(ca, &result, &slot) == 1) {
1729 mask |= POLLIN;
1730 }
1731
1732 return mask;
1733 }
1734 EXPORT_SYMBOL(dvb_ca_en50221_init);
1735
1736
1737 static const struct file_operations dvb_ca_fops = {
1738 .owner = THIS_MODULE,
1739 .read = dvb_ca_en50221_io_read,
1740 .write = dvb_ca_en50221_io_write,
1741 .unlocked_ioctl = dvb_ca_en50221_io_ioctl,
1742 .open = dvb_ca_en50221_io_open,
1743 .release = dvb_ca_en50221_io_release,
1744 .poll = dvb_ca_en50221_io_poll,
1745 .llseek = noop_llseek,
1746 };
1747
1748 static const struct dvb_device dvbdev_ca = {
1749 .priv = NULL,
1750 .users = 1,
1751 .readers = 1,
1752 .writers = 1,
1753 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
1754 .name = "dvb-ca-en50221",
1755 #endif
1756 .fops = &dvb_ca_fops,
1757 };
1758
1759 /* ******************************************************************************** */
1760 /* Initialisation/shutdown functions */
1761
1762
1763 /**
1764 * Initialise a new DVB CA EN50221 interface device.
1765 *
1766 * @dvb_adapter: DVB adapter to attach the new CA device to.
1767 * @ca: The dvb_ca instance.
1768 * @flags: Flags describing the CA device (DVB_CA_FLAG_*).
1769 * @slot_count: Number of slots supported.
1770 *
1771 * @return 0 on success, nonzero on failure
1772 */
1773 int dvb_ca_en50221_init(struct dvb_adapter *dvb_adapter,
1774 struct dvb_ca_en50221 *pubca, int flags, int slot_count)
1775 {
1776 int ret;
1777 struct dvb_ca_private *ca = NULL;
1778 int i;
1779
1780 dprintk("%s\n", __func__);
1781
1782 if (slot_count < 1)
1783 return -EINVAL;
1784
1785 /* initialise the system data */
1786 if ((ca = kzalloc(sizeof(struct dvb_ca_private), GFP_KERNEL)) == NULL) {
1787 ret = -ENOMEM;
1788 goto exit;
1789 }
1790 kref_init(&ca->refcount);
1791 ca->pub = pubca;
1792 ca->flags = flags;
1793 ca->slot_count = slot_count;
1794 if ((ca->slot_info = kcalloc(slot_count, sizeof(struct dvb_ca_slot), GFP_KERNEL)) == NULL) {
1795 ret = -ENOMEM;
1796 goto free_ca;
1797 }
1798 init_waitqueue_head(&ca->wait_queue);
1799 ca->open = 0;
1800 ca->wakeup = 0;
1801 ca->next_read_slot = 0;
1802 pubca->private = ca;
1803
1804 /* register the DVB device */
1805 ret = dvb_register_device(dvb_adapter, &ca->dvbdev, &dvbdev_ca, ca, DVB_DEVICE_CA, 0);
1806 if (ret)
1807 goto free_slot_info;
1808
1809 /* now initialise each slot */
1810 for (i = 0; i < slot_count; i++) {
1811 memset(&ca->slot_info[i], 0, sizeof(struct dvb_ca_slot));
1812 ca->slot_info[i].slot_state = DVB_CA_SLOTSTATE_NONE;
1813 atomic_set(&ca->slot_info[i].camchange_count, 0);
1814 ca->slot_info[i].camchange_type = DVB_CA_EN50221_CAMCHANGE_REMOVED;
1815 mutex_init(&ca->slot_info[i].slot_lock);
1816 }
1817
1818 mutex_init(&ca->ioctl_mutex);
1819
1820 if (signal_pending(current)) {
1821 ret = -EINTR;
1822 goto unregister_device;
1823 }
1824 mb();
1825
1826 /* create a kthread for monitoring this CA device */
1827 ca->thread = kthread_run(dvb_ca_en50221_thread, ca, "kdvb-ca-%i:%i",
1828 ca->dvbdev->adapter->num, ca->dvbdev->id);
1829 if (IS_ERR(ca->thread)) {
1830 ret = PTR_ERR(ca->thread);
1831 pr_err("dvb_ca_init: failed to start kernel_thread (%d)\n",
1832 ret);
1833 goto unregister_device;
1834 }
1835 return 0;
1836
1837 unregister_device:
1838 dvb_unregister_device(ca->dvbdev);
1839 free_slot_info:
1840 kfree(ca->slot_info);
1841 free_ca:
1842 kfree(ca);
1843 exit:
1844 pubca->private = NULL;
1845 return ret;
1846 }
1847 EXPORT_SYMBOL(dvb_ca_en50221_release);
1848
1849
1850
1851 /**
1852 * Release a DVB CA EN50221 interface device.
1853 *
1854 * @ca_dev: The dvb_device_t instance for the CA device.
1855 * @ca: The associated dvb_ca instance.
1856 */
1857 void dvb_ca_en50221_release(struct dvb_ca_en50221 *pubca)
1858 {
1859 struct dvb_ca_private *ca = pubca->private;
1860 int i;
1861
1862 dprintk("%s\n", __func__);
1863
1864 /* shutdown the thread if there was one */
1865 kthread_stop(ca->thread);
1866
1867 for (i = 0; i < ca->slot_count; i++) {
1868 dvb_ca_en50221_slot_shutdown(ca, i);
1869 }
1870 dvb_remove_device(ca->dvbdev);
1871 dvb_ca_private_put(ca);
1872 pubca->private = NULL;
1873 }
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