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Merge branch 'x86-pti-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...
[mirror_ubuntu-bionic-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
80 #define DVB_CA_SLOTSTATE_NONE 0
81 #define DVB_CA_SLOTSTATE_UNINITIALISED 1
82 #define DVB_CA_SLOTSTATE_RUNNING 2
83 #define DVB_CA_SLOTSTATE_INVALID 3
84 #define DVB_CA_SLOTSTATE_WAITREADY 4
85 #define DVB_CA_SLOTSTATE_VALIDATE 5
86 #define DVB_CA_SLOTSTATE_WAITFR 6
87 #define DVB_CA_SLOTSTATE_LINKINIT 7
88
89 /* Information on a CA slot */
90 struct dvb_ca_slot {
91 /* current state of the CAM */
92 int slot_state;
93
94 /* mutex used for serializing access to one CI slot */
95 struct mutex slot_lock;
96
97 /* Number of CAMCHANGES that have occurred since last processing */
98 atomic_t camchange_count;
99
100 /* Type of last CAMCHANGE */
101 int camchange_type;
102
103 /* base address of CAM config */
104 u32 config_base;
105
106 /* value to write into Config Control register */
107 u8 config_option;
108
109 /* if 1, the CAM supports DA IRQs */
110 u8 da_irq_supported:1;
111
112 /* size of the buffer to use when talking to the CAM */
113 int link_buf_size;
114
115 /* buffer for incoming packets */
116 struct dvb_ringbuffer rx_buffer;
117
118 /* timer used during various states of the slot */
119 unsigned long timeout;
120 };
121
122 /* Private CA-interface information */
123 struct dvb_ca_private {
124 struct kref refcount;
125
126 /* pointer back to the public data structure */
127 struct dvb_ca_en50221 *pub;
128
129 /* the DVB device */
130 struct dvb_device *dvbdev;
131
132 /* Flags describing the interface (DVB_CA_FLAG_*) */
133 u32 flags;
134
135 /* number of slots supported by this CA interface */
136 unsigned int slot_count;
137
138 /* information on each slot */
139 struct dvb_ca_slot *slot_info;
140
141 /* wait queues for read() and write() operations */
142 wait_queue_head_t wait_queue;
143
144 /* PID of the monitoring thread */
145 struct task_struct *thread;
146
147 /* Flag indicating if the CA device is open */
148 unsigned int open:1;
149
150 /* Flag indicating the thread should wake up now */
151 unsigned int wakeup:1;
152
153 /* Delay the main thread should use */
154 unsigned long delay;
155
156 /*
157 * Slot to start looking for data to read from in the next user-space
158 * read operation
159 */
160 int next_read_slot;
161
162 /* mutex serializing ioctls */
163 struct mutex ioctl_mutex;
164 };
165
166 static void dvb_ca_private_free(struct dvb_ca_private *ca)
167 {
168 unsigned int i;
169
170 dvb_free_device(ca->dvbdev);
171 for (i = 0; i < ca->slot_count; i++)
172 vfree(ca->slot_info[i].rx_buffer.data);
173
174 kfree(ca->slot_info);
175 kfree(ca);
176 }
177
178 static void dvb_ca_private_release(struct kref *ref)
179 {
180 struct dvb_ca_private *ca;
181
182 ca = container_of(ref, struct dvb_ca_private, refcount);
183 dvb_ca_private_free(ca);
184 }
185
186 static void dvb_ca_private_get(struct dvb_ca_private *ca)
187 {
188 kref_get(&ca->refcount);
189 }
190
191 static void dvb_ca_private_put(struct dvb_ca_private *ca)
192 {
193 kref_put(&ca->refcount, dvb_ca_private_release);
194 }
195
196 static void dvb_ca_en50221_thread_wakeup(struct dvb_ca_private *ca);
197 static int dvb_ca_en50221_read_data(struct dvb_ca_private *ca, int slot,
198 u8 *ebuf, int ecount);
199 static int dvb_ca_en50221_write_data(struct dvb_ca_private *ca, int slot,
200 u8 *ebuf, int ecount);
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 /* EN50221 physical interface functions */
228
229 /*
230 * dvb_ca_en50221_check_camstatus - Check CAM status.
231 */
232 static int dvb_ca_en50221_check_camstatus(struct dvb_ca_private *ca, int slot)
233 {
234 struct dvb_ca_slot *sl = &ca->slot_info[slot];
235 int slot_status;
236 int cam_present_now;
237 int cam_changed;
238
239 /* IRQ mode */
240 if (ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE)
241 return (atomic_read(&sl->camchange_count) != 0);
242
243 /* poll mode */
244 slot_status = ca->pub->poll_slot_status(ca->pub, slot, ca->open);
245
246 cam_present_now = (slot_status & DVB_CA_EN50221_POLL_CAM_PRESENT) ? 1 : 0;
247 cam_changed = (slot_status & DVB_CA_EN50221_POLL_CAM_CHANGED) ? 1 : 0;
248 if (!cam_changed) {
249 int cam_present_old = (sl->slot_state != DVB_CA_SLOTSTATE_NONE);
250
251 cam_changed = (cam_present_now != cam_present_old);
252 }
253
254 if (cam_changed) {
255 if (!cam_present_now)
256 sl->camchange_type = DVB_CA_EN50221_CAMCHANGE_REMOVED;
257 else
258 sl->camchange_type = DVB_CA_EN50221_CAMCHANGE_INSERTED;
259 atomic_set(&sl->camchange_count, 1);
260 } else {
261 if ((sl->slot_state == DVB_CA_SLOTSTATE_WAITREADY) &&
262 (slot_status & DVB_CA_EN50221_POLL_CAM_READY)) {
263 /* move to validate state if reset is completed */
264 sl->slot_state = DVB_CA_SLOTSTATE_VALIDATE;
265 }
266 }
267
268 return cam_changed;
269 }
270
271 /**
272 * dvb_ca_en50221_wait_if_status - Wait for flags to become set on the STATUS
273 * register on a CAM interface, checking for errors and timeout.
274 *
275 * @ca: CA instance.
276 * @slot: Slot on interface.
277 * @waitfor: Flags to wait for.
278 * @timeout_hz: Timeout in milliseconds.
279 *
280 * return: 0 on success, nonzero on error.
281 */
282 static int dvb_ca_en50221_wait_if_status(struct dvb_ca_private *ca, int slot,
283 u8 waitfor, int timeout_hz)
284 {
285 unsigned long timeout;
286 unsigned long start;
287
288 dprintk("%s\n", __func__);
289
290 /* loop until timeout elapsed */
291 start = jiffies;
292 timeout = jiffies + timeout_hz;
293 while (1) {
294 int res;
295
296 /* read the status and check for error */
297 res = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS);
298 if (res < 0)
299 return -EIO;
300
301 /* if we got the flags, it was successful! */
302 if (res & waitfor) {
303 dprintk("%s succeeded timeout:%lu\n",
304 __func__, jiffies - start);
305 return 0;
306 }
307
308 /* check for timeout */
309 if (time_after(jiffies, timeout))
310 break;
311
312 /* wait for a bit */
313 usleep_range(1000, 1100);
314 }
315
316 dprintk("%s failed timeout:%lu\n", __func__, jiffies - start);
317
318 /* if we get here, we've timed out */
319 return -ETIMEDOUT;
320 }
321
322 /**
323 * dvb_ca_en50221_link_init - Initialise the link layer connection to a CAM.
324 *
325 * @ca: CA instance.
326 * @slot: Slot id.
327 *
328 * return: 0 on success, nonzero on failure.
329 */
330 static int dvb_ca_en50221_link_init(struct dvb_ca_private *ca, int slot)
331 {
332 struct dvb_ca_slot *sl = &ca->slot_info[slot];
333 int ret;
334 int buf_size;
335 u8 buf[2];
336
337 dprintk("%s\n", __func__);
338
339 /* we'll be determining these during this function */
340 sl->da_irq_supported = 0;
341
342 /*
343 * set the host link buffer size temporarily. it will be overwritten
344 * with the real negotiated size later.
345 */
346 sl->link_buf_size = 2;
347
348 /* read the buffer size from the CAM */
349 ret = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND,
350 IRQEN | CMDREG_SR);
351 if (ret)
352 return ret;
353 ret = dvb_ca_en50221_wait_if_status(ca, slot, STATUSREG_DA, HZ);
354 if (ret)
355 return ret;
356 ret = dvb_ca_en50221_read_data(ca, slot, buf, 2);
357 if (ret != 2)
358 return -EIO;
359 ret = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, IRQEN);
360 if (ret)
361 return ret;
362
363 /*
364 * store it, and choose the minimum of our buffer and the CAM's buffer
365 * size
366 */
367 buf_size = (buf[0] << 8) | buf[1];
368 if (buf_size > HOST_LINK_BUF_SIZE)
369 buf_size = HOST_LINK_BUF_SIZE;
370 sl->link_buf_size = buf_size;
371 buf[0] = buf_size >> 8;
372 buf[1] = buf_size & 0xff;
373 dprintk("Chosen link buffer size of %i\n", buf_size);
374
375 /* write the buffer size to the CAM */
376 ret = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND,
377 IRQEN | CMDREG_SW);
378 if (ret)
379 return ret;
380 ret = dvb_ca_en50221_wait_if_status(ca, slot, STATUSREG_FR, HZ / 10);
381 if (ret)
382 return ret;
383 ret = dvb_ca_en50221_write_data(ca, slot, buf, 2);
384 if (ret != 2)
385 return -EIO;
386 ret = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, IRQEN);
387 if (ret)
388 return ret;
389
390 /* success */
391 return 0;
392 }
393
394 /**
395 * dvb_ca_en50221_read_tuple - Read a tuple from attribute memory.
396 *
397 * @ca: CA instance.
398 * @slot: Slot id.
399 * @address: Address to read from. Updated.
400 * @tuple_type: Tuple id byte. Updated.
401 * @tuple_length: Tuple length. Updated.
402 * @tuple: Dest buffer for tuple (must be 256 bytes). Updated.
403 *
404 * return: 0 on success, nonzero on error.
405 */
406 static int dvb_ca_en50221_read_tuple(struct dvb_ca_private *ca, int slot,
407 int *address, int *tuple_type,
408 int *tuple_length, u8 *tuple)
409 {
410 int i;
411 int _tuple_type;
412 int _tuple_length;
413 int _address = *address;
414
415 /* grab the next tuple length and type */
416 _tuple_type = ca->pub->read_attribute_mem(ca->pub, slot, _address);
417 if (_tuple_type < 0)
418 return _tuple_type;
419 if (_tuple_type == 0xff) {
420 dprintk("END OF CHAIN TUPLE type:0x%x\n", _tuple_type);
421 *address += 2;
422 *tuple_type = _tuple_type;
423 *tuple_length = 0;
424 return 0;
425 }
426 _tuple_length = ca->pub->read_attribute_mem(ca->pub, slot,
427 _address + 2);
428 if (_tuple_length < 0)
429 return _tuple_length;
430 _address += 4;
431
432 dprintk("TUPLE type:0x%x length:%i\n", _tuple_type, _tuple_length);
433
434 /* read in the whole tuple */
435 for (i = 0; i < _tuple_length; i++) {
436 tuple[i] = ca->pub->read_attribute_mem(ca->pub, slot,
437 _address + (i * 2));
438 dprintk(" 0x%02x: 0x%02x %c\n",
439 i, tuple[i] & 0xff,
440 ((tuple[i] > 31) && (tuple[i] < 127)) ? tuple[i] : '.');
441 }
442 _address += (_tuple_length * 2);
443
444 /* success */
445 *tuple_type = _tuple_type;
446 *tuple_length = _tuple_length;
447 *address = _address;
448 return 0;
449 }
450
451 /**
452 * dvb_ca_en50221_parse_attributes - Parse attribute memory of a CAM module,
453 * extracting Config register, and checking it is a DVB CAM module.
454 *
455 * @ca: CA instance.
456 * @slot: Slot id.
457 *
458 * return: 0 on success, <0 on failure.
459 */
460 static int dvb_ca_en50221_parse_attributes(struct dvb_ca_private *ca, int slot)
461 {
462 struct dvb_ca_slot *sl;
463 int address = 0;
464 int tuple_length;
465 int tuple_type;
466 u8 tuple[257];
467 char *dvb_str;
468 int rasz;
469 int status;
470 int got_cftableentry = 0;
471 int end_chain = 0;
472 int i;
473 u16 manfid = 0;
474 u16 devid = 0;
475
476 /* CISTPL_DEVICE_0A */
477 status = dvb_ca_en50221_read_tuple(ca, slot, &address, &tuple_type,
478 &tuple_length, tuple);
479 if (status < 0)
480 return status;
481 if (tuple_type != 0x1D)
482 return -EINVAL;
483
484 /* CISTPL_DEVICE_0C */
485 status = dvb_ca_en50221_read_tuple(ca, slot, &address, &tuple_type,
486 &tuple_length, tuple);
487 if (status < 0)
488 return status;
489 if (tuple_type != 0x1C)
490 return -EINVAL;
491
492 /* CISTPL_VERS_1 */
493 status = dvb_ca_en50221_read_tuple(ca, slot, &address, &tuple_type,
494 &tuple_length, tuple);
495 if (status < 0)
496 return status;
497 if (tuple_type != 0x15)
498 return -EINVAL;
499
500 /* CISTPL_MANFID */
501 status = dvb_ca_en50221_read_tuple(ca, slot, &address, &tuple_type,
502 &tuple_length, tuple);
503 if (status < 0)
504 return status;
505 if (tuple_type != 0x20)
506 return -EINVAL;
507 if (tuple_length != 4)
508 return -EINVAL;
509 manfid = (tuple[1] << 8) | tuple[0];
510 devid = (tuple[3] << 8) | tuple[2];
511
512 /* CISTPL_CONFIG */
513 status = dvb_ca_en50221_read_tuple(ca, slot, &address, &tuple_type,
514 &tuple_length, tuple);
515 if (status < 0)
516 return status;
517 if (tuple_type != 0x1A)
518 return -EINVAL;
519 if (tuple_length < 3)
520 return -EINVAL;
521
522 /* extract the configbase */
523 rasz = tuple[0] & 3;
524 if (tuple_length < (3 + rasz + 14))
525 return -EINVAL;
526 sl = &ca->slot_info[slot];
527 sl->config_base = 0;
528 for (i = 0; i < rasz + 1; i++)
529 sl->config_base |= (tuple[2 + i] << (8 * i));
530
531 /* check it contains the correct DVB string */
532 dvb_str = findstr((char *)tuple, tuple_length, "DVB_CI_V", 8);
533 if (!dvb_str)
534 return -EINVAL;
535 if (tuple_length < ((dvb_str - (char *)tuple) + 12))
536 return -EINVAL;
537
538 /* is it a version we support? */
539 if (strncmp(dvb_str + 8, "1.00", 4)) {
540 pr_err("dvb_ca adapter %d: Unsupported DVB CAM module version %c%c%c%c\n",
541 ca->dvbdev->adapter->num, dvb_str[8], dvb_str[9],
542 dvb_str[10], dvb_str[11]);
543 return -EINVAL;
544 }
545
546 /* process the CFTABLE_ENTRY tuples, and any after those */
547 while ((!end_chain) && (address < 0x1000)) {
548 status = dvb_ca_en50221_read_tuple(ca, slot, &address,
549 &tuple_type, &tuple_length,
550 tuple);
551 if (status < 0)
552 return status;
553 switch (tuple_type) {
554 case 0x1B: /* CISTPL_CFTABLE_ENTRY */
555 if (tuple_length < (2 + 11 + 17))
556 break;
557
558 /* if we've already parsed one, just use it */
559 if (got_cftableentry)
560 break;
561
562 /* get the config option */
563 sl->config_option = tuple[0] & 0x3f;
564
565 /* OK, check it contains the correct strings */
566 if (!findstr((char *)tuple, tuple_length,
567 "DVB_HOST", 8) ||
568 !findstr((char *)tuple, tuple_length,
569 "DVB_CI_MODULE", 13))
570 break;
571
572 got_cftableentry = 1;
573 break;
574
575 case 0x14: /* CISTPL_NO_LINK */
576 break;
577
578 case 0xFF: /* CISTPL_END */
579 end_chain = 1;
580 break;
581
582 default: /* Unknown tuple type - just skip this tuple */
583 dprintk("dvb_ca: Skipping unknown tuple type:0x%x length:0x%x\n",
584 tuple_type, tuple_length);
585 break;
586 }
587 }
588
589 if ((address > 0x1000) || (!got_cftableentry))
590 return -EINVAL;
591
592 dprintk("Valid DVB CAM detected MANID:%x DEVID:%x CONFIGBASE:0x%x CONFIGOPTION:0x%x\n",
593 manfid, devid, sl->config_base, sl->config_option);
594
595 /* success! */
596 return 0;
597 }
598
599 /**
600 * dvb_ca_en50221_set_configoption - Set CAM's configoption correctly.
601 *
602 * @ca: CA instance.
603 * @slot: Slot containing the CAM.
604 */
605 static int dvb_ca_en50221_set_configoption(struct dvb_ca_private *ca, int slot)
606 {
607 struct dvb_ca_slot *sl = &ca->slot_info[slot];
608 int configoption;
609
610 dprintk("%s\n", __func__);
611
612 /* set the config option */
613 ca->pub->write_attribute_mem(ca->pub, slot, sl->config_base,
614 sl->config_option);
615
616 /* check it */
617 configoption = ca->pub->read_attribute_mem(ca->pub, slot,
618 sl->config_base);
619 dprintk("Set configoption 0x%x, read configoption 0x%x\n",
620 sl->config_option, configoption & 0x3f);
621
622 /* fine! */
623 return 0;
624 }
625
626 /**
627 * dvb_ca_en50221_read_data - This function talks to an EN50221 CAM control
628 * interface. It reads a buffer of data from the CAM. The data can either
629 * be stored in a supplied buffer, or automatically be added to the slot's
630 * rx_buffer.
631 *
632 * @ca: CA instance.
633 * @slot: Slot to read from.
634 * @ebuf: If non-NULL, the data will be written to this buffer. If NULL,
635 * the data will be added into the buffering system as a normal
636 * fragment.
637 * @ecount: Size of ebuf. Ignored if ebuf is NULL.
638 *
639 * return: Number of bytes read, or < 0 on error
640 */
641 static int dvb_ca_en50221_read_data(struct dvb_ca_private *ca, int slot,
642 u8 *ebuf, int ecount)
643 {
644 struct dvb_ca_slot *sl = &ca->slot_info[slot];
645 int bytes_read;
646 int status;
647 u8 buf[HOST_LINK_BUF_SIZE];
648 int i;
649
650 dprintk("%s\n", __func__);
651
652 /* check if we have space for a link buf in the rx_buffer */
653 if (!ebuf) {
654 int buf_free;
655
656 if (!sl->rx_buffer.data) {
657 status = -EIO;
658 goto exit;
659 }
660 buf_free = dvb_ringbuffer_free(&sl->rx_buffer);
661
662 if (buf_free < (sl->link_buf_size +
663 DVB_RINGBUFFER_PKTHDRSIZE)) {
664 status = -EAGAIN;
665 goto exit;
666 }
667 }
668
669 if (ca->pub->read_data &&
670 (sl->slot_state != DVB_CA_SLOTSTATE_LINKINIT)) {
671 if (!ebuf)
672 status = ca->pub->read_data(ca->pub, slot, buf,
673 sizeof(buf));
674 else
675 status = ca->pub->read_data(ca->pub, slot, buf, ecount);
676 if (status < 0)
677 return status;
678 bytes_read = status;
679 if (status == 0)
680 goto exit;
681 } else {
682 /* check if there is data available */
683 status = ca->pub->read_cam_control(ca->pub, slot,
684 CTRLIF_STATUS);
685 if (status < 0)
686 goto exit;
687 if (!(status & STATUSREG_DA)) {
688 /* no data */
689 status = 0;
690 goto exit;
691 }
692
693 /* read the amount of data */
694 status = ca->pub->read_cam_control(ca->pub, slot,
695 CTRLIF_SIZE_HIGH);
696 if (status < 0)
697 goto exit;
698 bytes_read = status << 8;
699 status = ca->pub->read_cam_control(ca->pub, slot,
700 CTRLIF_SIZE_LOW);
701 if (status < 0)
702 goto exit;
703 bytes_read |= status;
704
705 /* check it will fit */
706 if (!ebuf) {
707 if (bytes_read > sl->link_buf_size) {
708 pr_err("dvb_ca adapter %d: CAM tried to send a buffer larger than the link buffer size (%i > %i)!\n",
709 ca->dvbdev->adapter->num, bytes_read,
710 sl->link_buf_size);
711 sl->slot_state = DVB_CA_SLOTSTATE_LINKINIT;
712 status = -EIO;
713 goto exit;
714 }
715 if (bytes_read < 2) {
716 pr_err("dvb_ca adapter %d: CAM sent a buffer that was less than 2 bytes!\n",
717 ca->dvbdev->adapter->num);
718 sl->slot_state = DVB_CA_SLOTSTATE_LINKINIT;
719 status = -EIO;
720 goto exit;
721 }
722 } else {
723 if (bytes_read > ecount) {
724 pr_err("dvb_ca adapter %d: CAM tried to send a buffer larger than the ecount size!\n",
725 ca->dvbdev->adapter->num);
726 status = -EIO;
727 goto exit;
728 }
729 }
730
731 /* fill the buffer */
732 for (i = 0; i < bytes_read; i++) {
733 /* read byte and check */
734 status = ca->pub->read_cam_control(ca->pub, slot,
735 CTRLIF_DATA);
736 if (status < 0)
737 goto exit;
738
739 /* OK, store it in the buffer */
740 buf[i] = status;
741 }
742
743 /* check for read error (RE should now be 0) */
744 status = ca->pub->read_cam_control(ca->pub, slot,
745 CTRLIF_STATUS);
746 if (status < 0)
747 goto exit;
748 if (status & STATUSREG_RE) {
749 sl->slot_state = DVB_CA_SLOTSTATE_LINKINIT;
750 status = -EIO;
751 goto exit;
752 }
753 }
754
755 /*
756 * OK, add it to the receive buffer, or copy into external buffer if
757 * supplied
758 */
759 if (!ebuf) {
760 if (!sl->rx_buffer.data) {
761 status = -EIO;
762 goto exit;
763 }
764 dvb_ringbuffer_pkt_write(&sl->rx_buffer, buf, bytes_read);
765 } else {
766 memcpy(ebuf, buf, bytes_read);
767 }
768
769 dprintk("Received CA packet for slot %i connection id 0x%x last_frag:%i size:0x%x\n", slot,
770 buf[0], (buf[1] & 0x80) == 0, bytes_read);
771
772 /* wake up readers when a last_fragment is received */
773 if ((buf[1] & 0x80) == 0x00)
774 wake_up_interruptible(&ca->wait_queue);
775
776 status = bytes_read;
777
778 exit:
779 return status;
780 }
781
782 /**
783 * dvb_ca_en50221_write_data - This function talks to an EN50221 CAM control
784 * interface. It writes a buffer of data to a CAM.
785 *
786 * @ca: CA instance.
787 * @slot: Slot to write to.
788 * @buf: The data in this buffer is treated as a complete link-level packet to
789 * be written.
790 * @bytes_write: Size of ebuf.
791 *
792 * return: Number of bytes written, or < 0 on error.
793 */
794 static int dvb_ca_en50221_write_data(struct dvb_ca_private *ca, int slot,
795 u8 *buf, int bytes_write)
796 {
797 struct dvb_ca_slot *sl = &ca->slot_info[slot];
798 int status;
799 int i;
800
801 dprintk("%s\n", __func__);
802
803 /* sanity check */
804 if (bytes_write > sl->link_buf_size)
805 return -EINVAL;
806
807 if (ca->pub->write_data &&
808 (sl->slot_state != DVB_CA_SLOTSTATE_LINKINIT))
809 return ca->pub->write_data(ca->pub, slot, buf, bytes_write);
810
811 /*
812 * it is possible we are dealing with a single buffer implementation,
813 * thus if there is data available for read or if there is even a read
814 * already in progress, we do nothing but awake the kernel thread to
815 * process the data if necessary.
816 */
817 status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS);
818 if (status < 0)
819 goto exitnowrite;
820 if (status & (STATUSREG_DA | STATUSREG_RE)) {
821 if (status & STATUSREG_DA)
822 dvb_ca_en50221_thread_wakeup(ca);
823
824 status = -EAGAIN;
825 goto exitnowrite;
826 }
827
828 /* OK, set HC bit */
829 status = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND,
830 IRQEN | CMDREG_HC);
831 if (status)
832 goto exit;
833
834 /* check if interface is still free */
835 status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS);
836 if (status < 0)
837 goto exit;
838 if (!(status & STATUSREG_FR)) {
839 /* it wasn't free => try again later */
840 status = -EAGAIN;
841 goto exit;
842 }
843
844 /*
845 * It may need some time for the CAM to settle down, or there might
846 * be a race condition between the CAM, writing HC and our last
847 * check for DA. This happens, if the CAM asserts DA, just after
848 * checking DA before we are setting HC. In this case it might be
849 * a bug in the CAM to keep the FR bit, the lower layer/HW
850 * communication requires a longer timeout or the CAM needs more
851 * time internally. But this happens in reality!
852 * We need to read the status from the HW again and do the same
853 * we did for the previous check for DA
854 */
855 status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS);
856 if (status < 0)
857 goto exit;
858
859 if (status & (STATUSREG_DA | STATUSREG_RE)) {
860 if (status & STATUSREG_DA)
861 dvb_ca_en50221_thread_wakeup(ca);
862
863 status = -EAGAIN;
864 goto exit;
865 }
866
867 /* send the amount of data */
868 status = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_SIZE_HIGH,
869 bytes_write >> 8);
870 if (status)
871 goto exit;
872 status = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_SIZE_LOW,
873 bytes_write & 0xff);
874 if (status)
875 goto exit;
876
877 /* send the buffer */
878 for (i = 0; i < bytes_write; i++) {
879 status = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_DATA,
880 buf[i]);
881 if (status)
882 goto exit;
883 }
884
885 /* check for write error (WE should now be 0) */
886 status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS);
887 if (status < 0)
888 goto exit;
889 if (status & STATUSREG_WE) {
890 sl->slot_state = DVB_CA_SLOTSTATE_LINKINIT;
891 status = -EIO;
892 goto exit;
893 }
894 status = bytes_write;
895
896 dprintk("Wrote CA packet for slot %i, connection id 0x%x last_frag:%i size:0x%x\n", slot,
897 buf[0], (buf[1] & 0x80) == 0, bytes_write);
898
899 exit:
900 ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, IRQEN);
901
902 exitnowrite:
903 return status;
904 }
905
906 /* ************************************************************************** */
907 /* EN50221 higher level functions */
908
909 /**
910 * dvb_ca_en50221_slot_shutdown - A CAM has been removed => shut it down.
911 *
912 * @ca: CA instance.
913 * @slot: Slot to shut down.
914 */
915 static int dvb_ca_en50221_slot_shutdown(struct dvb_ca_private *ca, int slot)
916 {
917 dprintk("%s\n", __func__);
918
919 ca->pub->slot_shutdown(ca->pub, slot);
920 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_NONE;
921
922 /*
923 * need to wake up all processes to check if they're now trying to
924 * write to a defunct CAM
925 */
926 wake_up_interruptible(&ca->wait_queue);
927
928 dprintk("Slot %i shutdown\n", slot);
929
930 /* success */
931 return 0;
932 }
933
934 /**
935 * dvb_ca_en50221_camchange_irq - A CAMCHANGE IRQ has occurred.
936 *
937 * @pubca: CA instance.
938 * @slot: Slot concerned.
939 * @change_type: One of the DVB_CA_CAMCHANGE_* values.
940 */
941 void dvb_ca_en50221_camchange_irq(struct dvb_ca_en50221 *pubca, int slot,
942 int change_type)
943 {
944 struct dvb_ca_private *ca = pubca->private;
945 struct dvb_ca_slot *sl = &ca->slot_info[slot];
946
947 dprintk("CAMCHANGE IRQ slot:%i change_type:%i\n", slot, change_type);
948
949 switch (change_type) {
950 case DVB_CA_EN50221_CAMCHANGE_REMOVED:
951 case DVB_CA_EN50221_CAMCHANGE_INSERTED:
952 break;
953
954 default:
955 return;
956 }
957
958 sl->camchange_type = change_type;
959 atomic_inc(&sl->camchange_count);
960 dvb_ca_en50221_thread_wakeup(ca);
961 }
962 EXPORT_SYMBOL(dvb_ca_en50221_camchange_irq);
963
964 /**
965 * dvb_ca_en50221_camready_irq - A CAMREADY IRQ has occurred.
966 *
967 * @pubca: CA instance.
968 * @slot: Slot concerned.
969 */
970 void dvb_ca_en50221_camready_irq(struct dvb_ca_en50221 *pubca, int slot)
971 {
972 struct dvb_ca_private *ca = pubca->private;
973 struct dvb_ca_slot *sl = &ca->slot_info[slot];
974
975 dprintk("CAMREADY IRQ slot:%i\n", slot);
976
977 if (sl->slot_state == DVB_CA_SLOTSTATE_WAITREADY) {
978 sl->slot_state = DVB_CA_SLOTSTATE_VALIDATE;
979 dvb_ca_en50221_thread_wakeup(ca);
980 }
981 }
982 EXPORT_SYMBOL(dvb_ca_en50221_camready_irq);
983
984 /**
985 * dvb_ca_en50221_frda_irq - An FR or DA IRQ has occurred.
986 *
987 * @pubca: CA instance.
988 * @slot: Slot concerned.
989 */
990 void dvb_ca_en50221_frda_irq(struct dvb_ca_en50221 *pubca, int slot)
991 {
992 struct dvb_ca_private *ca = pubca->private;
993 struct dvb_ca_slot *sl = &ca->slot_info[slot];
994 int flags;
995
996 dprintk("FR/DA IRQ slot:%i\n", slot);
997
998 switch (sl->slot_state) {
999 case DVB_CA_SLOTSTATE_LINKINIT:
1000 flags = ca->pub->read_cam_control(pubca, slot, CTRLIF_STATUS);
1001 if (flags & STATUSREG_DA) {
1002 dprintk("CAM supports DA IRQ\n");
1003 sl->da_irq_supported = 1;
1004 }
1005 break;
1006
1007 case DVB_CA_SLOTSTATE_RUNNING:
1008 if (ca->open)
1009 dvb_ca_en50221_thread_wakeup(ca);
1010 break;
1011 }
1012 }
1013 EXPORT_SYMBOL(dvb_ca_en50221_frda_irq);
1014
1015 /* ************************************************************************** */
1016 /* EN50221 thread functions */
1017
1018 /**
1019 * Wake up the DVB CA thread
1020 *
1021 * @ca: CA instance.
1022 */
1023 static void dvb_ca_en50221_thread_wakeup(struct dvb_ca_private *ca)
1024 {
1025 dprintk("%s\n", __func__);
1026
1027 ca->wakeup = 1;
1028 mb();
1029 wake_up_process(ca->thread);
1030 }
1031
1032 /**
1033 * Update the delay used by the thread.
1034 *
1035 * @ca: CA instance.
1036 */
1037 static void dvb_ca_en50221_thread_update_delay(struct dvb_ca_private *ca)
1038 {
1039 int delay;
1040 int curdelay = 100000000;
1041 int slot;
1042
1043 /*
1044 * Beware of too high polling frequency, because one polling
1045 * call might take several hundred milliseconds until timeout!
1046 */
1047 for (slot = 0; slot < ca->slot_count; slot++) {
1048 struct dvb_ca_slot *sl = &ca->slot_info[slot];
1049
1050 switch (sl->slot_state) {
1051 default:
1052 case DVB_CA_SLOTSTATE_NONE:
1053 delay = HZ * 60; /* 60s */
1054 if (!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE))
1055 delay = HZ * 5; /* 5s */
1056 break;
1057 case DVB_CA_SLOTSTATE_INVALID:
1058 delay = HZ * 60; /* 60s */
1059 if (!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE))
1060 delay = HZ / 10; /* 100ms */
1061 break;
1062
1063 case DVB_CA_SLOTSTATE_UNINITIALISED:
1064 case DVB_CA_SLOTSTATE_WAITREADY:
1065 case DVB_CA_SLOTSTATE_VALIDATE:
1066 case DVB_CA_SLOTSTATE_WAITFR:
1067 case DVB_CA_SLOTSTATE_LINKINIT:
1068 delay = HZ / 10; /* 100ms */
1069 break;
1070
1071 case DVB_CA_SLOTSTATE_RUNNING:
1072 delay = HZ * 60; /* 60s */
1073 if (!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE))
1074 delay = HZ / 10; /* 100ms */
1075 if (ca->open) {
1076 if ((!sl->da_irq_supported) ||
1077 (!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_DA)))
1078 delay = HZ / 10; /* 100ms */
1079 }
1080 break;
1081 }
1082
1083 if (delay < curdelay)
1084 curdelay = delay;
1085 }
1086
1087 ca->delay = curdelay;
1088 }
1089
1090 /**
1091 * Poll if the CAM is gone.
1092 *
1093 * @ca: CA instance.
1094 * @slot: Slot to process.
1095 * return:: 0 .. no change
1096 * 1 .. CAM state changed
1097 */
1098
1099 static int dvb_ca_en50221_poll_cam_gone(struct dvb_ca_private *ca, int slot)
1100 {
1101 int changed = 0;
1102 int status;
1103
1104 /*
1105 * we need this extra check for annoying interfaces like the
1106 * budget-av
1107 */
1108 if ((!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE)) &&
1109 (ca->pub->poll_slot_status)) {
1110 status = ca->pub->poll_slot_status(ca->pub, slot, 0);
1111 if (!(status &
1112 DVB_CA_EN50221_POLL_CAM_PRESENT)) {
1113 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_NONE;
1114 dvb_ca_en50221_thread_update_delay(ca);
1115 changed = 1;
1116 }
1117 }
1118 return changed;
1119 }
1120
1121 /**
1122 * Thread state machine for one CA slot to perform the data transfer.
1123 *
1124 * @ca: CA instance.
1125 * @slot: Slot to process.
1126 */
1127 static void dvb_ca_en50221_thread_state_machine(struct dvb_ca_private *ca,
1128 int slot)
1129 {
1130 struct dvb_ca_slot *sl = &ca->slot_info[slot];
1131 int flags;
1132 int pktcount;
1133 void *rxbuf;
1134
1135 mutex_lock(&sl->slot_lock);
1136
1137 /* check the cam status + deal with CAMCHANGEs */
1138 while (dvb_ca_en50221_check_camstatus(ca, slot)) {
1139 /* clear down an old CI slot if necessary */
1140 if (sl->slot_state != DVB_CA_SLOTSTATE_NONE)
1141 dvb_ca_en50221_slot_shutdown(ca, slot);
1142
1143 /* if a CAM is NOW present, initialise it */
1144 if (sl->camchange_type == DVB_CA_EN50221_CAMCHANGE_INSERTED)
1145 sl->slot_state = DVB_CA_SLOTSTATE_UNINITIALISED;
1146
1147 /* we've handled one CAMCHANGE */
1148 dvb_ca_en50221_thread_update_delay(ca);
1149 atomic_dec(&sl->camchange_count);
1150 }
1151
1152 /* CAM state machine */
1153 switch (sl->slot_state) {
1154 case DVB_CA_SLOTSTATE_NONE:
1155 case DVB_CA_SLOTSTATE_INVALID:
1156 /* no action needed */
1157 break;
1158
1159 case DVB_CA_SLOTSTATE_UNINITIALISED:
1160 sl->slot_state = DVB_CA_SLOTSTATE_WAITREADY;
1161 ca->pub->slot_reset(ca->pub, slot);
1162 sl->timeout = jiffies + (INIT_TIMEOUT_SECS * HZ);
1163 break;
1164
1165 case DVB_CA_SLOTSTATE_WAITREADY:
1166 if (time_after(jiffies, sl->timeout)) {
1167 pr_err("dvb_ca adaptor %d: PC card did not respond :(\n",
1168 ca->dvbdev->adapter->num);
1169 sl->slot_state = DVB_CA_SLOTSTATE_INVALID;
1170 dvb_ca_en50221_thread_update_delay(ca);
1171 break;
1172 }
1173 /*
1174 * no other action needed; will automatically change state when
1175 * ready
1176 */
1177 break;
1178
1179 case DVB_CA_SLOTSTATE_VALIDATE:
1180 if (dvb_ca_en50221_parse_attributes(ca, slot) != 0) {
1181 if (dvb_ca_en50221_poll_cam_gone(ca, slot))
1182 break;
1183
1184 pr_err("dvb_ca adapter %d: Invalid PC card inserted :(\n",
1185 ca->dvbdev->adapter->num);
1186 sl->slot_state = DVB_CA_SLOTSTATE_INVALID;
1187 dvb_ca_en50221_thread_update_delay(ca);
1188 break;
1189 }
1190 if (dvb_ca_en50221_set_configoption(ca, slot) != 0) {
1191 pr_err("dvb_ca adapter %d: Unable to initialise CAM :(\n",
1192 ca->dvbdev->adapter->num);
1193 sl->slot_state = DVB_CA_SLOTSTATE_INVALID;
1194 dvb_ca_en50221_thread_update_delay(ca);
1195 break;
1196 }
1197 if (ca->pub->write_cam_control(ca->pub, slot,
1198 CTRLIF_COMMAND,
1199 CMDREG_RS) != 0) {
1200 pr_err("dvb_ca adapter %d: Unable to reset CAM IF\n",
1201 ca->dvbdev->adapter->num);
1202 sl->slot_state = DVB_CA_SLOTSTATE_INVALID;
1203 dvb_ca_en50221_thread_update_delay(ca);
1204 break;
1205 }
1206 dprintk("DVB CAM validated successfully\n");
1207
1208 sl->timeout = jiffies + (INIT_TIMEOUT_SECS * HZ);
1209 sl->slot_state = DVB_CA_SLOTSTATE_WAITFR;
1210 ca->wakeup = 1;
1211 break;
1212
1213 case DVB_CA_SLOTSTATE_WAITFR:
1214 if (time_after(jiffies, sl->timeout)) {
1215 pr_err("dvb_ca adapter %d: DVB CAM did not respond :(\n",
1216 ca->dvbdev->adapter->num);
1217 sl->slot_state = DVB_CA_SLOTSTATE_INVALID;
1218 dvb_ca_en50221_thread_update_delay(ca);
1219 break;
1220 }
1221
1222 flags = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS);
1223 if (flags & STATUSREG_FR) {
1224 sl->slot_state = DVB_CA_SLOTSTATE_LINKINIT;
1225 ca->wakeup = 1;
1226 }
1227 break;
1228
1229 case DVB_CA_SLOTSTATE_LINKINIT:
1230 if (dvb_ca_en50221_link_init(ca, slot) != 0) {
1231 if (dvb_ca_en50221_poll_cam_gone(ca, slot))
1232 break;
1233
1234 pr_err("dvb_ca adapter %d: DVB CAM link initialisation failed :(\n",
1235 ca->dvbdev->adapter->num);
1236 sl->slot_state = DVB_CA_SLOTSTATE_UNINITIALISED;
1237 dvb_ca_en50221_thread_update_delay(ca);
1238 break;
1239 }
1240
1241 if (!sl->rx_buffer.data) {
1242 rxbuf = vmalloc(RX_BUFFER_SIZE);
1243 if (!rxbuf) {
1244 pr_err("dvb_ca adapter %d: Unable to allocate CAM rx buffer :(\n",
1245 ca->dvbdev->adapter->num);
1246 sl->slot_state = DVB_CA_SLOTSTATE_INVALID;
1247 dvb_ca_en50221_thread_update_delay(ca);
1248 break;
1249 }
1250 dvb_ringbuffer_init(&sl->rx_buffer, rxbuf,
1251 RX_BUFFER_SIZE);
1252 }
1253
1254 ca->pub->slot_ts_enable(ca->pub, slot);
1255 sl->slot_state = DVB_CA_SLOTSTATE_RUNNING;
1256 dvb_ca_en50221_thread_update_delay(ca);
1257 pr_err("dvb_ca adapter %d: DVB CAM detected and initialised successfully\n",
1258 ca->dvbdev->adapter->num);
1259 break;
1260
1261 case DVB_CA_SLOTSTATE_RUNNING:
1262 if (!ca->open)
1263 break;
1264
1265 /* poll slots for data */
1266 pktcount = 0;
1267 while (dvb_ca_en50221_read_data(ca, slot, NULL, 0) > 0) {
1268 if (!ca->open)
1269 break;
1270
1271 /*
1272 * if a CAMCHANGE occurred at some point, do not do any
1273 * more processing of this slot
1274 */
1275 if (dvb_ca_en50221_check_camstatus(ca, slot)) {
1276 /*
1277 * we don't want to sleep on the next iteration
1278 * so we can handle the cam change
1279 */
1280 ca->wakeup = 1;
1281 break;
1282 }
1283
1284 /* check if we've hit our limit this time */
1285 if (++pktcount >= MAX_RX_PACKETS_PER_ITERATION) {
1286 /*
1287 * don't sleep; there is likely to be more data
1288 * to read
1289 */
1290 ca->wakeup = 1;
1291 break;
1292 }
1293 }
1294 break;
1295 }
1296
1297 mutex_unlock(&sl->slot_lock);
1298 }
1299
1300 /*
1301 * Kernel thread which monitors CA slots for CAM changes, and performs data
1302 * transfers.
1303 */
1304 static int dvb_ca_en50221_thread(void *data)
1305 {
1306 struct dvb_ca_private *ca = data;
1307 int slot;
1308
1309 dprintk("%s\n", __func__);
1310
1311 /* choose the correct initial delay */
1312 dvb_ca_en50221_thread_update_delay(ca);
1313
1314 /* main loop */
1315 while (!kthread_should_stop()) {
1316 /* sleep for a bit */
1317 if (!ca->wakeup) {
1318 set_current_state(TASK_INTERRUPTIBLE);
1319 schedule_timeout(ca->delay);
1320 if (kthread_should_stop())
1321 return 0;
1322 }
1323 ca->wakeup = 0;
1324
1325 /* go through all the slots processing them */
1326 for (slot = 0; slot < ca->slot_count; slot++)
1327 dvb_ca_en50221_thread_state_machine(ca, slot);
1328 }
1329
1330 return 0;
1331 }
1332
1333 /* ************************************************************************** */
1334 /* EN50221 IO interface functions */
1335
1336 /**
1337 * Real ioctl implementation.
1338 * NOTE: CA_SEND_MSG/CA_GET_MSG ioctls have userspace buffers passed to them.
1339 *
1340 * @file: File concerned.
1341 * @cmd: IOCTL command.
1342 * @parg: Associated argument.
1343 *
1344 * return: 0 on success, <0 on error.
1345 */
1346 static int dvb_ca_en50221_io_do_ioctl(struct file *file,
1347 unsigned int cmd, void *parg)
1348 {
1349 struct dvb_device *dvbdev = file->private_data;
1350 struct dvb_ca_private *ca = dvbdev->priv;
1351 int err = 0;
1352 int slot;
1353
1354 dprintk("%s\n", __func__);
1355
1356 if (mutex_lock_interruptible(&ca->ioctl_mutex))
1357 return -ERESTARTSYS;
1358
1359 switch (cmd) {
1360 case CA_RESET:
1361 for (slot = 0; slot < ca->slot_count; slot++) {
1362 struct dvb_ca_slot *sl = &ca->slot_info[slot];
1363
1364 mutex_lock(&sl->slot_lock);
1365 if (sl->slot_state != DVB_CA_SLOTSTATE_NONE) {
1366 dvb_ca_en50221_slot_shutdown(ca, slot);
1367 if (ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE)
1368 dvb_ca_en50221_camchange_irq(ca->pub,
1369 slot,
1370 DVB_CA_EN50221_CAMCHANGE_INSERTED);
1371 }
1372 mutex_unlock(&sl->slot_lock);
1373 }
1374 ca->next_read_slot = 0;
1375 dvb_ca_en50221_thread_wakeup(ca);
1376 break;
1377
1378 case CA_GET_CAP: {
1379 struct ca_caps *caps = parg;
1380
1381 caps->slot_num = ca->slot_count;
1382 caps->slot_type = CA_CI_LINK;
1383 caps->descr_num = 0;
1384 caps->descr_type = 0;
1385 break;
1386 }
1387
1388 case CA_GET_SLOT_INFO: {
1389 struct ca_slot_info *info = parg;
1390 struct dvb_ca_slot *sl;
1391
1392 slot = info->num;
1393 if ((slot > ca->slot_count) || (slot < 0)) {
1394 err = -EINVAL;
1395 goto out_unlock;
1396 }
1397
1398 info->type = CA_CI_LINK;
1399 info->flags = 0;
1400 sl = &ca->slot_info[slot];
1401 if ((sl->slot_state != DVB_CA_SLOTSTATE_NONE) &&
1402 (sl->slot_state != DVB_CA_SLOTSTATE_INVALID)) {
1403 info->flags = CA_CI_MODULE_PRESENT;
1404 }
1405 if (sl->slot_state == DVB_CA_SLOTSTATE_RUNNING)
1406 info->flags |= CA_CI_MODULE_READY;
1407 break;
1408 }
1409
1410 default:
1411 err = -EINVAL;
1412 break;
1413 }
1414
1415 out_unlock:
1416 mutex_unlock(&ca->ioctl_mutex);
1417 return err;
1418 }
1419
1420 /**
1421 * Wrapper for ioctl implementation.
1422 *
1423 * @file: File concerned.
1424 * @cmd: IOCTL command.
1425 * @arg: Associated argument.
1426 *
1427 * return: 0 on success, <0 on error.
1428 */
1429 static long dvb_ca_en50221_io_ioctl(struct file *file,
1430 unsigned int cmd, unsigned long arg)
1431 {
1432 return dvb_usercopy(file, cmd, arg, dvb_ca_en50221_io_do_ioctl);
1433 }
1434
1435 /**
1436 * Implementation of write() syscall.
1437 *
1438 * @file: File structure.
1439 * @buf: Source buffer.
1440 * @count: Size of source buffer.
1441 * @ppos: Position in file (ignored).
1442 *
1443 * return: Number of bytes read, or <0 on error.
1444 */
1445 static ssize_t dvb_ca_en50221_io_write(struct file *file,
1446 const char __user *buf, size_t count,
1447 loff_t *ppos)
1448 {
1449 struct dvb_device *dvbdev = file->private_data;
1450 struct dvb_ca_private *ca = dvbdev->priv;
1451 struct dvb_ca_slot *sl;
1452 u8 slot, connection_id;
1453 int status;
1454 u8 fragbuf[HOST_LINK_BUF_SIZE];
1455 int fragpos = 0;
1456 int fraglen;
1457 unsigned long timeout;
1458 int written;
1459
1460 dprintk("%s\n", __func__);
1461
1462 /*
1463 * Incoming packet has a 2 byte header.
1464 * hdr[0] = slot_id, hdr[1] = connection_id
1465 */
1466 if (count < 2)
1467 return -EINVAL;
1468
1469 /* extract slot & connection id */
1470 if (copy_from_user(&slot, buf, 1))
1471 return -EFAULT;
1472 if (copy_from_user(&connection_id, buf + 1, 1))
1473 return -EFAULT;
1474 buf += 2;
1475 count -= 2;
1476 sl = &ca->slot_info[slot];
1477
1478 /* check if the slot is actually running */
1479 if (sl->slot_state != DVB_CA_SLOTSTATE_RUNNING)
1480 return -EINVAL;
1481
1482 /* fragment the packets & store in the buffer */
1483 while (fragpos < count) {
1484 fraglen = sl->link_buf_size - 2;
1485 if (fraglen < 0)
1486 break;
1487 if (fraglen > HOST_LINK_BUF_SIZE - 2)
1488 fraglen = HOST_LINK_BUF_SIZE - 2;
1489 if ((count - fragpos) < fraglen)
1490 fraglen = count - fragpos;
1491
1492 fragbuf[0] = connection_id;
1493 fragbuf[1] = ((fragpos + fraglen) < count) ? 0x80 : 0x00;
1494 status = copy_from_user(fragbuf + 2, buf + fragpos, fraglen);
1495 if (status) {
1496 status = -EFAULT;
1497 goto exit;
1498 }
1499
1500 timeout = jiffies + HZ / 2;
1501 written = 0;
1502 while (!time_after(jiffies, timeout)) {
1503 /*
1504 * check the CAM hasn't been removed/reset in the
1505 * meantime
1506 */
1507 if (sl->slot_state != DVB_CA_SLOTSTATE_RUNNING) {
1508 status = -EIO;
1509 goto exit;
1510 }
1511
1512 mutex_lock(&sl->slot_lock);
1513 status = dvb_ca_en50221_write_data(ca, slot, fragbuf,
1514 fraglen + 2);
1515 mutex_unlock(&sl->slot_lock);
1516 if (status == (fraglen + 2)) {
1517 written = 1;
1518 break;
1519 }
1520 if (status != -EAGAIN)
1521 goto exit;
1522
1523 usleep_range(1000, 1100);
1524 }
1525 if (!written) {
1526 status = -EIO;
1527 goto exit;
1528 }
1529
1530 fragpos += fraglen;
1531 }
1532 status = count + 2;
1533
1534 exit:
1535 return status;
1536 }
1537
1538 /*
1539 * Condition for waking up in dvb_ca_en50221_io_read_condition
1540 */
1541 static int dvb_ca_en50221_io_read_condition(struct dvb_ca_private *ca,
1542 int *result, int *_slot)
1543 {
1544 int slot;
1545 int slot_count = 0;
1546 int idx;
1547 size_t fraglen;
1548 int connection_id = -1;
1549 int found = 0;
1550 u8 hdr[2];
1551
1552 slot = ca->next_read_slot;
1553 while ((slot_count < ca->slot_count) && (!found)) {
1554 struct dvb_ca_slot *sl = &ca->slot_info[slot];
1555
1556 if (sl->slot_state != DVB_CA_SLOTSTATE_RUNNING)
1557 goto nextslot;
1558
1559 if (!sl->rx_buffer.data)
1560 return 0;
1561
1562 idx = dvb_ringbuffer_pkt_next(&sl->rx_buffer, -1, &fraglen);
1563 while (idx != -1) {
1564 dvb_ringbuffer_pkt_read(&sl->rx_buffer, idx, 0, hdr, 2);
1565 if (connection_id == -1)
1566 connection_id = hdr[0];
1567 if ((hdr[0] == connection_id) &&
1568 ((hdr[1] & 0x80) == 0)) {
1569 *_slot = slot;
1570 found = 1;
1571 break;
1572 }
1573
1574 idx = dvb_ringbuffer_pkt_next(&sl->rx_buffer, idx,
1575 &fraglen);
1576 }
1577
1578 nextslot:
1579 slot = (slot + 1) % ca->slot_count;
1580 slot_count++;
1581 }
1582
1583 ca->next_read_slot = slot;
1584 return found;
1585 }
1586
1587 /**
1588 * Implementation of read() syscall.
1589 *
1590 * @file: File structure.
1591 * @buf: Destination buffer.
1592 * @count: Size of destination buffer.
1593 * @ppos: Position in file (ignored).
1594 *
1595 * return: Number of bytes read, or <0 on error.
1596 */
1597 static ssize_t dvb_ca_en50221_io_read(struct file *file, char __user *buf,
1598 size_t count, loff_t *ppos)
1599 {
1600 struct dvb_device *dvbdev = file->private_data;
1601 struct dvb_ca_private *ca = dvbdev->priv;
1602 struct dvb_ca_slot *sl;
1603 int status;
1604 int result = 0;
1605 u8 hdr[2];
1606 int slot;
1607 int connection_id = -1;
1608 size_t idx, idx2;
1609 int last_fragment = 0;
1610 size_t fraglen;
1611 int pktlen;
1612 int dispose = 0;
1613
1614 dprintk("%s\n", __func__);
1615
1616 /*
1617 * Outgoing packet has a 2 byte header.
1618 * hdr[0] = slot_id, hdr[1] = connection_id
1619 */
1620 if (count < 2)
1621 return -EINVAL;
1622
1623 /* wait for some data */
1624 status = dvb_ca_en50221_io_read_condition(ca, &result, &slot);
1625 if (status == 0) {
1626 /* if we're in nonblocking mode, exit immediately */
1627 if (file->f_flags & O_NONBLOCK)
1628 return -EWOULDBLOCK;
1629
1630 /* wait for some data */
1631 status = wait_event_interruptible(ca->wait_queue,
1632 dvb_ca_en50221_io_read_condition
1633 (ca, &result, &slot));
1634 }
1635 if ((status < 0) || (result < 0)) {
1636 if (result)
1637 return result;
1638 return status;
1639 }
1640
1641 sl = &ca->slot_info[slot];
1642 idx = dvb_ringbuffer_pkt_next(&sl->rx_buffer, -1, &fraglen);
1643 pktlen = 2;
1644 do {
1645 if (idx == -1) {
1646 pr_err("dvb_ca adapter %d: BUG: read packet ended before last_fragment encountered\n",
1647 ca->dvbdev->adapter->num);
1648 status = -EIO;
1649 goto exit;
1650 }
1651
1652 dvb_ringbuffer_pkt_read(&sl->rx_buffer, idx, 0, hdr, 2);
1653 if (connection_id == -1)
1654 connection_id = hdr[0];
1655 if (hdr[0] == connection_id) {
1656 if (pktlen < count) {
1657 if ((pktlen + fraglen - 2) > count)
1658 fraglen = count - pktlen;
1659 else
1660 fraglen -= 2;
1661
1662 status =
1663 dvb_ringbuffer_pkt_read_user(&sl->rx_buffer,
1664 idx, 2,
1665 buf + pktlen,
1666 fraglen);
1667 if (status < 0)
1668 goto exit;
1669
1670 pktlen += fraglen;
1671 }
1672
1673 if ((hdr[1] & 0x80) == 0)
1674 last_fragment = 1;
1675 dispose = 1;
1676 }
1677
1678 idx2 = dvb_ringbuffer_pkt_next(&sl->rx_buffer, idx, &fraglen);
1679 if (dispose)
1680 dvb_ringbuffer_pkt_dispose(&sl->rx_buffer, idx);
1681 idx = idx2;
1682 dispose = 0;
1683 } while (!last_fragment);
1684
1685 hdr[0] = slot;
1686 hdr[1] = connection_id;
1687 status = copy_to_user(buf, hdr, 2);
1688 if (status) {
1689 status = -EFAULT;
1690 goto exit;
1691 }
1692 status = pktlen;
1693
1694 exit:
1695 return status;
1696 }
1697
1698 /**
1699 * Implementation of file open syscall.
1700 *
1701 * @inode: Inode concerned.
1702 * @file: File concerned.
1703 *
1704 * return: 0 on success, <0 on failure.
1705 */
1706 static int dvb_ca_en50221_io_open(struct inode *inode, struct file *file)
1707 {
1708 struct dvb_device *dvbdev = file->private_data;
1709 struct dvb_ca_private *ca = dvbdev->priv;
1710 int err;
1711 int i;
1712
1713 dprintk("%s\n", __func__);
1714
1715 if (!try_module_get(ca->pub->owner))
1716 return -EIO;
1717
1718 err = dvb_generic_open(inode, file);
1719 if (err < 0) {
1720 module_put(ca->pub->owner);
1721 return err;
1722 }
1723
1724 for (i = 0; i < ca->slot_count; i++) {
1725 struct dvb_ca_slot *sl = &ca->slot_info[i];
1726
1727 if (sl->slot_state == DVB_CA_SLOTSTATE_RUNNING) {
1728 if (!sl->rx_buffer.data) {
1729 /*
1730 * it is safe to call this here without locks
1731 * because ca->open == 0. Data is not read in
1732 * this case
1733 */
1734 dvb_ringbuffer_flush(&sl->rx_buffer);
1735 }
1736 }
1737 }
1738
1739 ca->open = 1;
1740 dvb_ca_en50221_thread_update_delay(ca);
1741 dvb_ca_en50221_thread_wakeup(ca);
1742
1743 dvb_ca_private_get(ca);
1744
1745 return 0;
1746 }
1747
1748 /**
1749 * Implementation of file close syscall.
1750 *
1751 * @inode: Inode concerned.
1752 * @file: File concerned.
1753 *
1754 * return: 0 on success, <0 on failure.
1755 */
1756 static int dvb_ca_en50221_io_release(struct inode *inode, struct file *file)
1757 {
1758 struct dvb_device *dvbdev = file->private_data;
1759 struct dvb_ca_private *ca = dvbdev->priv;
1760 int err;
1761
1762 dprintk("%s\n", __func__);
1763
1764 /* mark the CA device as closed */
1765 ca->open = 0;
1766 dvb_ca_en50221_thread_update_delay(ca);
1767
1768 err = dvb_generic_release(inode, file);
1769
1770 module_put(ca->pub->owner);
1771
1772 dvb_ca_private_put(ca);
1773
1774 return err;
1775 }
1776
1777 /**
1778 * Implementation of poll() syscall.
1779 *
1780 * @file: File concerned.
1781 * @wait: poll wait table.
1782 *
1783 * return: Standard poll mask.
1784 */
1785 static unsigned int dvb_ca_en50221_io_poll(struct file *file, poll_table *wait)
1786 {
1787 struct dvb_device *dvbdev = file->private_data;
1788 struct dvb_ca_private *ca = dvbdev->priv;
1789 unsigned int mask = 0;
1790 int slot;
1791 int result = 0;
1792
1793 dprintk("%s\n", __func__);
1794
1795 if (dvb_ca_en50221_io_read_condition(ca, &result, &slot) == 1)
1796 mask |= POLLIN;
1797
1798 /* if there is something, return now */
1799 if (mask)
1800 return mask;
1801
1802 /* wait for something to happen */
1803 poll_wait(file, &ca->wait_queue, wait);
1804
1805 if (dvb_ca_en50221_io_read_condition(ca, &result, &slot) == 1)
1806 mask |= POLLIN;
1807
1808 return mask;
1809 }
1810
1811 static const struct file_operations dvb_ca_fops = {
1812 .owner = THIS_MODULE,
1813 .read = dvb_ca_en50221_io_read,
1814 .write = dvb_ca_en50221_io_write,
1815 .unlocked_ioctl = dvb_ca_en50221_io_ioctl,
1816 .open = dvb_ca_en50221_io_open,
1817 .release = dvb_ca_en50221_io_release,
1818 .poll = dvb_ca_en50221_io_poll,
1819 .llseek = noop_llseek,
1820 };
1821
1822 static const struct dvb_device dvbdev_ca = {
1823 .priv = NULL,
1824 .users = 1,
1825 .readers = 1,
1826 .writers = 1,
1827 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
1828 .name = "dvb-ca-en50221",
1829 #endif
1830 .fops = &dvb_ca_fops,
1831 };
1832
1833 /* ************************************************************************** */
1834 /* Initialisation/shutdown functions */
1835
1836 /**
1837 * Initialise a new DVB CA EN50221 interface device.
1838 *
1839 * @dvb_adapter: DVB adapter to attach the new CA device to.
1840 * @pubca: The dvb_ca instance.
1841 * @flags: Flags describing the CA device (DVB_CA_FLAG_*).
1842 * @slot_count: Number of slots supported.
1843 *
1844 * return: 0 on success, nonzero on failure
1845 */
1846 int dvb_ca_en50221_init(struct dvb_adapter *dvb_adapter,
1847 struct dvb_ca_en50221 *pubca, int flags, int slot_count)
1848 {
1849 int ret;
1850 struct dvb_ca_private *ca = NULL;
1851 int i;
1852
1853 dprintk("%s\n", __func__);
1854
1855 if (slot_count < 1)
1856 return -EINVAL;
1857
1858 /* initialise the system data */
1859 ca = kzalloc(sizeof(*ca), GFP_KERNEL);
1860 if (!ca) {
1861 ret = -ENOMEM;
1862 goto exit;
1863 }
1864 kref_init(&ca->refcount);
1865 ca->pub = pubca;
1866 ca->flags = flags;
1867 ca->slot_count = slot_count;
1868 ca->slot_info = kcalloc(slot_count, sizeof(struct dvb_ca_slot),
1869 GFP_KERNEL);
1870 if (!ca->slot_info) {
1871 ret = -ENOMEM;
1872 goto free_ca;
1873 }
1874 init_waitqueue_head(&ca->wait_queue);
1875 ca->open = 0;
1876 ca->wakeup = 0;
1877 ca->next_read_slot = 0;
1878 pubca->private = ca;
1879
1880 /* register the DVB device */
1881 ret = dvb_register_device(dvb_adapter, &ca->dvbdev, &dvbdev_ca, ca,
1882 DVB_DEVICE_CA, 0);
1883 if (ret)
1884 goto free_slot_info;
1885
1886 /* now initialise each slot */
1887 for (i = 0; i < slot_count; i++) {
1888 struct dvb_ca_slot *sl = &ca->slot_info[i];
1889
1890 memset(sl, 0, sizeof(struct dvb_ca_slot));
1891 sl->slot_state = DVB_CA_SLOTSTATE_NONE;
1892 atomic_set(&sl->camchange_count, 0);
1893 sl->camchange_type = DVB_CA_EN50221_CAMCHANGE_REMOVED;
1894 mutex_init(&sl->slot_lock);
1895 }
1896
1897 mutex_init(&ca->ioctl_mutex);
1898
1899 if (signal_pending(current)) {
1900 ret = -EINTR;
1901 goto unregister_device;
1902 }
1903 mb();
1904
1905 /* create a kthread for monitoring this CA device */
1906 ca->thread = kthread_run(dvb_ca_en50221_thread, ca, "kdvb-ca-%i:%i",
1907 ca->dvbdev->adapter->num, ca->dvbdev->id);
1908 if (IS_ERR(ca->thread)) {
1909 ret = PTR_ERR(ca->thread);
1910 pr_err("dvb_ca_init: failed to start kernel_thread (%d)\n",
1911 ret);
1912 goto unregister_device;
1913 }
1914 return 0;
1915
1916 unregister_device:
1917 dvb_unregister_device(ca->dvbdev);
1918 free_slot_info:
1919 kfree(ca->slot_info);
1920 free_ca:
1921 kfree(ca);
1922 exit:
1923 pubca->private = NULL;
1924 return ret;
1925 }
1926 EXPORT_SYMBOL(dvb_ca_en50221_init);
1927
1928 /**
1929 * Release a DVB CA EN50221 interface device.
1930 *
1931 * @pubca: The associated dvb_ca instance.
1932 */
1933 void dvb_ca_en50221_release(struct dvb_ca_en50221 *pubca)
1934 {
1935 struct dvb_ca_private *ca = pubca->private;
1936 int i;
1937
1938 dprintk("%s\n", __func__);
1939
1940 /* shutdown the thread if there was one */
1941 kthread_stop(ca->thread);
1942
1943 for (i = 0; i < ca->slot_count; i++)
1944 dvb_ca_en50221_slot_shutdown(ca, i);
1945
1946 dvb_remove_device(ca->dvbdev);
1947 dvb_ca_private_put(ca);
1948 pubca->private = NULL;
1949 }
1950 EXPORT_SYMBOL(dvb_ca_en50221_release);
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