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Merge remote-tracking branch 'mkp-scsi/fixes' into fixes
[mirror_ubuntu-zesty-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 *
25 * You should have received a copy of the GNU General Public License
26 * along with this program; if not, write to the Free Software
27 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
28 * Or, point your browser to http://www.gnu.org/copyleft/gpl.html
29 */
30
31 #define pr_fmt(fmt) "dvb_ca_en50221: " fmt
32
33 #include <linux/errno.h>
34 #include <linux/slab.h>
35 #include <linux/list.h>
36 #include <linux/module.h>
37 #include <linux/vmalloc.h>
38 #include <linux/delay.h>
39 #include <linux/spinlock.h>
40 #include <linux/sched.h>
41 #include <linux/kthread.h>
42
43 #include "dvb_ca_en50221.h"
44 #include "dvb_ringbuffer.h"
45
46 static int dvb_ca_en50221_debug;
47
48 module_param_named(cam_debug, dvb_ca_en50221_debug, int, 0644);
49 MODULE_PARM_DESC(cam_debug, "enable verbose debug messages");
50
51 #define dprintk(fmt, arg...) do { \
52 if (dvb_ca_en50221_debug) \
53 printk(KERN_DEBUG pr_fmt("%s: " fmt), __func__, ##arg);\
54 } while (0)
55
56 #define INIT_TIMEOUT_SECS 10
57
58 #define HOST_LINK_BUF_SIZE 0x200
59
60 #define RX_BUFFER_SIZE 65535
61
62 #define MAX_RX_PACKETS_PER_ITERATION 10
63
64 #define CTRLIF_DATA 0
65 #define CTRLIF_COMMAND 1
66 #define CTRLIF_STATUS 1
67 #define CTRLIF_SIZE_LOW 2
68 #define CTRLIF_SIZE_HIGH 3
69
70 #define CMDREG_HC 1 /* Host control */
71 #define CMDREG_SW 2 /* Size write */
72 #define CMDREG_SR 4 /* Size read */
73 #define CMDREG_RS 8 /* Reset interface */
74 #define CMDREG_FRIE 0x40 /* Enable FR interrupt */
75 #define CMDREG_DAIE 0x80 /* Enable DA interrupt */
76 #define IRQEN (CMDREG_DAIE)
77
78 #define STATUSREG_RE 1 /* read error */
79 #define STATUSREG_WE 2 /* write error */
80 #define STATUSREG_FR 0x40 /* module free */
81 #define STATUSREG_DA 0x80 /* data available */
82 #define STATUSREG_TXERR (STATUSREG_RE|STATUSREG_WE) /* general transfer error */
83
84
85 #define DVB_CA_SLOTSTATE_NONE 0
86 #define DVB_CA_SLOTSTATE_UNINITIALISED 1
87 #define DVB_CA_SLOTSTATE_RUNNING 2
88 #define DVB_CA_SLOTSTATE_INVALID 3
89 #define DVB_CA_SLOTSTATE_WAITREADY 4
90 #define DVB_CA_SLOTSTATE_VALIDATE 5
91 #define DVB_CA_SLOTSTATE_WAITFR 6
92 #define DVB_CA_SLOTSTATE_LINKINIT 7
93
94
95 /* Information on a CA slot */
96 struct dvb_ca_slot {
97
98 /* current state of the CAM */
99 int slot_state;
100
101 /* mutex used for serializing access to one CI slot */
102 struct mutex slot_lock;
103
104 /* Number of CAMCHANGES that have occurred since last processing */
105 atomic_t camchange_count;
106
107 /* Type of last CAMCHANGE */
108 int camchange_type;
109
110 /* base address of CAM config */
111 u32 config_base;
112
113 /* value to write into Config Control register */
114 u8 config_option;
115
116 /* if 1, the CAM supports DA IRQs */
117 u8 da_irq_supported:1;
118
119 /* size of the buffer to use when talking to the CAM */
120 int link_buf_size;
121
122 /* buffer for incoming packets */
123 struct dvb_ringbuffer rx_buffer;
124
125 /* timer used during various states of the slot */
126 unsigned long timeout;
127 };
128
129 /* Private CA-interface information */
130 struct dvb_ca_private {
131 struct kref refcount;
132
133 /* pointer back to the public data structure */
134 struct dvb_ca_en50221 *pub;
135
136 /* the DVB device */
137 struct dvb_device *dvbdev;
138
139 /* Flags describing the interface (DVB_CA_FLAG_*) */
140 u32 flags;
141
142 /* number of slots supported by this CA interface */
143 unsigned int slot_count;
144
145 /* information on each slot */
146 struct dvb_ca_slot *slot_info;
147
148 /* wait queues for read() and write() operations */
149 wait_queue_head_t wait_queue;
150
151 /* PID of the monitoring thread */
152 struct task_struct *thread;
153
154 /* Flag indicating if the CA device is open */
155 unsigned int open:1;
156
157 /* Flag indicating the thread should wake up now */
158 unsigned int wakeup:1;
159
160 /* Delay the main thread should use */
161 unsigned long delay;
162
163 /* Slot to start looking for data to read from in the next user-space read operation */
164 int next_read_slot;
165
166 /* mutex serializing ioctls */
167 struct mutex ioctl_mutex;
168 };
169
170 static void dvb_ca_private_free(struct dvb_ca_private *ca)
171 {
172 unsigned int i;
173
174 dvb_free_device(ca->dvbdev);
175 for (i = 0; i < ca->slot_count; i++)
176 vfree(ca->slot_info[i].rx_buffer.data);
177
178 kfree(ca->slot_info);
179 kfree(ca);
180 }
181
182 static void dvb_ca_private_release(struct kref *ref)
183 {
184 struct dvb_ca_private *ca = container_of(ref, struct dvb_ca_private, refcount);
185 dvb_ca_private_free(ca);
186 }
187
188 static void dvb_ca_private_get(struct dvb_ca_private *ca)
189 {
190 kref_get(&ca->refcount);
191 }
192
193 static void dvb_ca_private_put(struct dvb_ca_private *ca)
194 {
195 kref_put(&ca->refcount, dvb_ca_private_release);
196 }
197
198 static void dvb_ca_en50221_thread_wakeup(struct dvb_ca_private *ca);
199 static int dvb_ca_en50221_read_data(struct dvb_ca_private *ca, int slot, u8 * ebuf, int ecount);
200 static int dvb_ca_en50221_write_data(struct dvb_ca_private *ca, int slot, u8 * ebuf, int ecount);
201
202
203 /**
204 * Safely find needle in haystack.
205 *
206 * @haystack: Buffer to look in.
207 * @hlen: Number of bytes in haystack.
208 * @needle: Buffer to find.
209 * @nlen: Number of bytes in needle.
210 * @return Pointer into haystack needle was found at, or NULL if not found.
211 */
212 static char *findstr(char * haystack, int hlen, char * needle, int nlen)
213 {
214 int i;
215
216 if (hlen < nlen)
217 return NULL;
218
219 for (i = 0; i <= hlen - nlen; i++) {
220 if (!strncmp(haystack + i, needle, nlen))
221 return haystack + i;
222 }
223
224 return NULL;
225 }
226
227
228
229 /* ******************************************************************************** */
230 /* EN50221 physical interface functions */
231
232
233 /**
234 * dvb_ca_en50221_check_camstatus - Check CAM status.
235 */
236 static int dvb_ca_en50221_check_camstatus(struct dvb_ca_private *ca, int slot)
237 {
238 int slot_status;
239 int cam_present_now;
240 int cam_changed;
241
242 /* IRQ mode */
243 if (ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE) {
244 return (atomic_read(&ca->slot_info[slot].camchange_count) != 0);
245 }
246
247 /* poll mode */
248 slot_status = ca->pub->poll_slot_status(ca->pub, slot, ca->open);
249
250 cam_present_now = (slot_status & DVB_CA_EN50221_POLL_CAM_PRESENT) ? 1 : 0;
251 cam_changed = (slot_status & DVB_CA_EN50221_POLL_CAM_CHANGED) ? 1 : 0;
252 if (!cam_changed) {
253 int cam_present_old = (ca->slot_info[slot].slot_state != DVB_CA_SLOTSTATE_NONE);
254 cam_changed = (cam_present_now != cam_present_old);
255 }
256
257 if (cam_changed) {
258 if (!cam_present_now) {
259 ca->slot_info[slot].camchange_type = DVB_CA_EN50221_CAMCHANGE_REMOVED;
260 } else {
261 ca->slot_info[slot].camchange_type = DVB_CA_EN50221_CAMCHANGE_INSERTED;
262 }
263 atomic_set(&ca->slot_info[slot].camchange_count, 1);
264 } else {
265 if ((ca->slot_info[slot].slot_state == DVB_CA_SLOTSTATE_WAITREADY) &&
266 (slot_status & DVB_CA_EN50221_POLL_CAM_READY)) {
267 // move to validate state if reset is completed
268 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_VALIDATE;
269 }
270 }
271
272 return cam_changed;
273 }
274
275
276 /**
277 * dvb_ca_en50221_wait_if_status - Wait for flags to become set on the STATUS
278 * register on a CAM interface, checking for errors and timeout.
279 *
280 * @ca: CA instance.
281 * @slot: Slot on interface.
282 * @waitfor: Flags to wait for.
283 * @timeout_ms: Timeout in milliseconds.
284 *
285 * @return 0 on success, nonzero on error.
286 */
287 static int dvb_ca_en50221_wait_if_status(struct dvb_ca_private *ca, int slot,
288 u8 waitfor, int timeout_hz)
289 {
290 unsigned long timeout;
291 unsigned long start;
292
293 dprintk("%s\n", __func__);
294
295 /* loop until timeout elapsed */
296 start = jiffies;
297 timeout = jiffies + timeout_hz;
298 while (1) {
299 /* read the status and check for error */
300 int res = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS);
301 if (res < 0)
302 return -EIO;
303
304 /* if we got the flags, it was successful! */
305 if (res & waitfor) {
306 dprintk("%s succeeded timeout:%lu\n",
307 __func__, jiffies - start);
308 return 0;
309 }
310
311 /* check for timeout */
312 if (time_after(jiffies, timeout)) {
313 break;
314 }
315
316 /* wait for a bit */
317 msleep(1);
318 }
319
320 dprintk("%s failed timeout:%lu\n", __func__, jiffies - start);
321
322 /* if we get here, we've timed out */
323 return -ETIMEDOUT;
324 }
325
326
327 /**
328 * dvb_ca_en50221_link_init - Initialise the link layer connection to a CAM.
329 *
330 * @ca: CA instance.
331 * @slot: Slot id.
332 *
333 * @return 0 on success, nonzero on failure.
334 */
335 static int dvb_ca_en50221_link_init(struct dvb_ca_private *ca, int slot)
336 {
337 int ret;
338 int buf_size;
339 u8 buf[2];
340
341 dprintk("%s\n", __func__);
342
343 /* we'll be determining these during this function */
344 ca->slot_info[slot].da_irq_supported = 0;
345
346 /* set the host link buffer size temporarily. it will be overwritten with the
347 * real negotiated size later. */
348 ca->slot_info[slot].link_buf_size = 2;
349
350 /* read the buffer size from the CAM */
351 if ((ret = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, IRQEN | CMDREG_SR)) != 0)
352 return ret;
353 if ((ret = dvb_ca_en50221_wait_if_status(ca, slot, STATUSREG_DA, HZ / 10)) != 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, int *tupleLength, u8 * tuple)
397 {
398 int i;
399 int _tupleType;
400 int _tupleLength;
401 int _address = *address;
402
403 /* grab the next tuple length and type */
404 if ((_tupleType = ca->pub->read_attribute_mem(ca->pub, slot, _address)) < 0)
405 return _tupleType;
406 if (_tupleType == 0xff) {
407 dprintk("END OF CHAIN TUPLE type:0x%x\n", _tupleType);
408 *address += 2;
409 *tupleType = _tupleType;
410 *tupleLength = 0;
411 return 0;
412 }
413 if ((_tupleLength = ca->pub->read_attribute_mem(ca->pub, slot, _address + 2)) < 0)
414 return _tupleLength;
415 _address += 4;
416
417 dprintk("TUPLE type:0x%x length:%i\n", _tupleType, _tupleLength);
418
419 /* read in the whole tuple */
420 for (i = 0; i < _tupleLength; i++) {
421 tuple[i] = ca->pub->read_attribute_mem(ca->pub, slot, _address + (i * 2));
422 dprintk(" 0x%02x: 0x%02x %c\n",
423 i, tuple[i] & 0xff,
424 ((tuple[i] > 31) && (tuple[i] < 127)) ? tuple[i] : '.');
425 }
426 _address += (_tupleLength * 2);
427
428 // success
429 *tupleType = _tupleType;
430 *tupleLength = _tupleLength;
431 *address = _address;
432 return 0;
433 }
434
435
436 /**
437 * dvb_ca_en50221_parse_attributes - Parse attribute memory of a CAM module,
438 * extracting Config register, and checking it is a DVB CAM module.
439 *
440 * @ca: CA instance.
441 * @slot: Slot id.
442 *
443 * @return 0 on success, <0 on failure.
444 */
445 static int dvb_ca_en50221_parse_attributes(struct dvb_ca_private *ca, int slot)
446 {
447 int address = 0;
448 int tupleLength;
449 int tupleType;
450 u8 tuple[257];
451 char *dvb_str;
452 int rasz;
453 int status;
454 int got_cftableentry = 0;
455 int end_chain = 0;
456 int i;
457 u16 manfid = 0;
458 u16 devid = 0;
459
460
461 // CISTPL_DEVICE_0A
462 if ((status =
463 dvb_ca_en50221_read_tuple(ca, slot, &address, &tupleType, &tupleLength, tuple)) < 0)
464 return status;
465 if (tupleType != 0x1D)
466 return -EINVAL;
467
468
469
470 // CISTPL_DEVICE_0C
471 if ((status =
472 dvb_ca_en50221_read_tuple(ca, slot, &address, &tupleType, &tupleLength, tuple)) < 0)
473 return status;
474 if (tupleType != 0x1C)
475 return -EINVAL;
476
477
478
479 // CISTPL_VERS_1
480 if ((status =
481 dvb_ca_en50221_read_tuple(ca, slot, &address, &tupleType, &tupleLength, tuple)) < 0)
482 return status;
483 if (tupleType != 0x15)
484 return -EINVAL;
485
486
487
488 // CISTPL_MANFID
489 if ((status = dvb_ca_en50221_read_tuple(ca, slot, &address, &tupleType,
490 &tupleLength, tuple)) < 0)
491 return status;
492 if (tupleType != 0x20)
493 return -EINVAL;
494 if (tupleLength != 4)
495 return -EINVAL;
496 manfid = (tuple[1] << 8) | tuple[0];
497 devid = (tuple[3] << 8) | tuple[2];
498
499
500
501 // CISTPL_CONFIG
502 if ((status = dvb_ca_en50221_read_tuple(ca, slot, &address, &tupleType,
503 &tupleLength, tuple)) < 0)
504 return status;
505 if (tupleType != 0x1A)
506 return -EINVAL;
507 if (tupleLength < 3)
508 return -EINVAL;
509
510 /* extract the configbase */
511 rasz = tuple[0] & 3;
512 if (tupleLength < (3 + rasz + 14))
513 return -EINVAL;
514 ca->slot_info[slot].config_base = 0;
515 for (i = 0; i < rasz + 1; i++) {
516 ca->slot_info[slot].config_base |= (tuple[2 + i] << (8 * i));
517 }
518
519 /* check it contains the correct DVB string */
520 dvb_str = findstr((char *)tuple, tupleLength, "DVB_CI_V", 8);
521 if (dvb_str == NULL)
522 return -EINVAL;
523 if (tupleLength < ((dvb_str - (char *) tuple) + 12))
524 return -EINVAL;
525
526 /* is it a version we support? */
527 if (strncmp(dvb_str + 8, "1.00", 4)) {
528 pr_err("dvb_ca adapter %d: Unsupported DVB CAM module version %c%c%c%c\n",
529 ca->dvbdev->adapter->num, dvb_str[8], dvb_str[9],
530 dvb_str[10], dvb_str[11]);
531 return -EINVAL;
532 }
533
534 /* process the CFTABLE_ENTRY tuples, and any after those */
535 while ((!end_chain) && (address < 0x1000)) {
536 if ((status = dvb_ca_en50221_read_tuple(ca, slot, &address, &tupleType,
537 &tupleLength, tuple)) < 0)
538 return status;
539 switch (tupleType) {
540 case 0x1B: // CISTPL_CFTABLE_ENTRY
541 if (tupleLength < (2 + 11 + 17))
542 break;
543
544 /* if we've already parsed one, just use it */
545 if (got_cftableentry)
546 break;
547
548 /* get the config option */
549 ca->slot_info[slot].config_option = tuple[0] & 0x3f;
550
551 /* OK, check it contains the correct strings */
552 if ((findstr((char *)tuple, tupleLength, "DVB_HOST", 8) == NULL) ||
553 (findstr((char *)tuple, tupleLength, "DVB_CI_MODULE", 13) == NULL))
554 break;
555
556 got_cftableentry = 1;
557 break;
558
559 case 0x14: // CISTPL_NO_LINK
560 break;
561
562 case 0xFF: // CISTPL_END
563 end_chain = 1;
564 break;
565
566 default: /* Unknown tuple type - just skip this tuple and move to the next one */
567 dprintk("dvb_ca: Skipping unknown tuple type:0x%x length:0x%x\n",
568 tupleType, tupleLength);
569 break;
570 }
571 }
572
573 if ((address > 0x1000) || (!got_cftableentry))
574 return -EINVAL;
575
576 dprintk("Valid DVB CAM detected MANID:%x DEVID:%x CONFIGBASE:0x%x CONFIGOPTION:0x%x\n",
577 manfid, devid, ca->slot_info[slot].config_base,
578 ca->slot_info[slot].config_option);
579
580 // success!
581 return 0;
582 }
583
584
585 /**
586 * dvb_ca_en50221_set_configoption - Set CAM's configoption correctly.
587 *
588 * @ca: CA instance.
589 * @slot: Slot containing the CAM.
590 */
591 static int dvb_ca_en50221_set_configoption(struct dvb_ca_private *ca, int slot)
592 {
593 int configoption;
594
595 dprintk("%s\n", __func__);
596
597 /* set the config option */
598 ca->pub->write_attribute_mem(ca->pub, slot,
599 ca->slot_info[slot].config_base,
600 ca->slot_info[slot].config_option);
601
602 /* check it */
603 configoption = ca->pub->read_attribute_mem(ca->pub, slot, ca->slot_info[slot].config_base);
604 dprintk("Set configoption 0x%x, read configoption 0x%x\n",
605 ca->slot_info[slot].config_option, configoption & 0x3f);
606
607 /* fine! */
608 return 0;
609
610 }
611
612
613 /**
614 * dvb_ca_en50221_read_data - This function talks to an EN50221 CAM control
615 * interface. It reads a buffer of data from the CAM. The data can either
616 * be stored in a supplied buffer, or automatically be added to the slot's
617 * rx_buffer.
618 *
619 * @ca: CA instance.
620 * @slot: Slot to read from.
621 * @ebuf: If non-NULL, the data will be written to this buffer. If NULL,
622 * the data will be added into the buffering system as a normal fragment.
623 * @ecount: Size of ebuf. Ignored if ebuf is NULL.
624 *
625 * @return Number of bytes read, or < 0 on error
626 */
627 static int dvb_ca_en50221_read_data(struct dvb_ca_private *ca, int slot, u8 * ebuf, int ecount)
628 {
629 int bytes_read;
630 int status;
631 u8 buf[HOST_LINK_BUF_SIZE];
632 int i;
633
634 dprintk("%s\n", __func__);
635
636 /* check if we have space for a link buf in the rx_buffer */
637 if (ebuf == NULL) {
638 int buf_free;
639
640 if (ca->slot_info[slot].rx_buffer.data == NULL) {
641 status = -EIO;
642 goto exit;
643 }
644 buf_free = dvb_ringbuffer_free(&ca->slot_info[slot].rx_buffer);
645
646 if (buf_free < (ca->slot_info[slot].link_buf_size + DVB_RINGBUFFER_PKTHDRSIZE)) {
647 status = -EAGAIN;
648 goto exit;
649 }
650 }
651
652 /* check if there is data available */
653 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS)) < 0)
654 goto exit;
655 if (!(status & STATUSREG_DA)) {
656 /* no data */
657 status = 0;
658 goto exit;
659 }
660
661 /* read the amount of data */
662 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_SIZE_HIGH)) < 0)
663 goto exit;
664 bytes_read = status << 8;
665 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_SIZE_LOW)) < 0)
666 goto exit;
667 bytes_read |= status;
668
669 /* check it will fit */
670 if (ebuf == NULL) {
671 if (bytes_read > ca->slot_info[slot].link_buf_size) {
672 pr_err("dvb_ca adapter %d: CAM tried to send a buffer larger than the link buffer size (%i > %i)!\n",
673 ca->dvbdev->adapter->num, bytes_read,
674 ca->slot_info[slot].link_buf_size);
675 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_LINKINIT;
676 status = -EIO;
677 goto exit;
678 }
679 if (bytes_read < 2) {
680 pr_err("dvb_ca adapter %d: CAM sent a buffer that was less than 2 bytes!\n",
681 ca->dvbdev->adapter->num);
682 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_LINKINIT;
683 status = -EIO;
684 goto exit;
685 }
686 } else {
687 if (bytes_read > ecount) {
688 pr_err("dvb_ca adapter %d: CAM tried to send a buffer larger than the ecount size!\n",
689 ca->dvbdev->adapter->num);
690 status = -EIO;
691 goto exit;
692 }
693 }
694
695 /* fill the buffer */
696 for (i = 0; i < bytes_read; i++) {
697 /* read byte and check */
698 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_DATA)) < 0)
699 goto exit;
700
701 /* OK, store it in the buffer */
702 buf[i] = status;
703 }
704
705 /* check for read error (RE should now be 0) */
706 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS)) < 0)
707 goto exit;
708 if (status & STATUSREG_RE) {
709 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_LINKINIT;
710 status = -EIO;
711 goto exit;
712 }
713
714 /* OK, add it to the receive buffer, or copy into external buffer if supplied */
715 if (ebuf == NULL) {
716 if (ca->slot_info[slot].rx_buffer.data == NULL) {
717 status = -EIO;
718 goto exit;
719 }
720 dvb_ringbuffer_pkt_write(&ca->slot_info[slot].rx_buffer, buf, bytes_read);
721 } else {
722 memcpy(ebuf, buf, bytes_read);
723 }
724
725 dprintk("Received CA packet for slot %i connection id 0x%x last_frag:%i size:0x%x\n", slot,
726 buf[0], (buf[1] & 0x80) == 0, bytes_read);
727
728 /* wake up readers when a last_fragment is received */
729 if ((buf[1] & 0x80) == 0x00) {
730 wake_up_interruptible(&ca->wait_queue);
731 }
732 status = bytes_read;
733
734 exit:
735 return status;
736 }
737
738
739 /**
740 * dvb_ca_en50221_write_data - This function talks to an EN50221 CAM control
741 * interface. It writes a buffer of data to a CAM.
742 *
743 * @ca: CA instance.
744 * @slot: Slot to write to.
745 * @ebuf: The data in this buffer is treated as a complete link-level packet to
746 * be written.
747 * @count: Size of ebuf.
748 *
749 * @return Number of bytes written, or < 0 on error.
750 */
751 static int dvb_ca_en50221_write_data(struct dvb_ca_private *ca, int slot, u8 * buf, int bytes_write)
752 {
753 int status;
754 int i;
755
756 dprintk("%s\n", __func__);
757
758
759 /* sanity check */
760 if (bytes_write > ca->slot_info[slot].link_buf_size)
761 return -EINVAL;
762
763 /* it is possible we are dealing with a single buffer implementation,
764 thus if there is data available for read or if there is even a read
765 already in progress, we do nothing but awake the kernel thread to
766 process the data if necessary. */
767 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS)) < 0)
768 goto exitnowrite;
769 if (status & (STATUSREG_DA | STATUSREG_RE)) {
770 if (status & STATUSREG_DA)
771 dvb_ca_en50221_thread_wakeup(ca);
772
773 status = -EAGAIN;
774 goto exitnowrite;
775 }
776
777 /* OK, set HC bit */
778 if ((status = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND,
779 IRQEN | CMDREG_HC)) != 0)
780 goto exit;
781
782 /* check if interface is still free */
783 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS)) < 0)
784 goto exit;
785 if (!(status & STATUSREG_FR)) {
786 /* it wasn't free => try again later */
787 status = -EAGAIN;
788 goto exit;
789 }
790
791 /* send the amount of data */
792 if ((status = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_SIZE_HIGH, bytes_write >> 8)) != 0)
793 goto exit;
794 if ((status = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_SIZE_LOW,
795 bytes_write & 0xff)) != 0)
796 goto exit;
797
798 /* send the buffer */
799 for (i = 0; i < bytes_write; i++) {
800 if ((status = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_DATA, buf[i])) != 0)
801 goto exit;
802 }
803
804 /* check for write error (WE should now be 0) */
805 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS)) < 0)
806 goto exit;
807 if (status & STATUSREG_WE) {
808 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_LINKINIT;
809 status = -EIO;
810 goto exit;
811 }
812 status = bytes_write;
813
814 dprintk("Wrote CA packet for slot %i, connection id 0x%x last_frag:%i size:0x%x\n", slot,
815 buf[0], (buf[1] & 0x80) == 0, bytes_write);
816
817 exit:
818 ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, IRQEN);
819
820 exitnowrite:
821 return status;
822 }
823 EXPORT_SYMBOL(dvb_ca_en50221_camchange_irq);
824
825
826
827 /* ******************************************************************************** */
828 /* EN50221 higher level functions */
829
830
831 /**
832 * dvb_ca_en50221_camready_irq - A CAM has been removed => shut it down.
833 *
834 * @ca: CA instance.
835 * @slot: Slot to shut down.
836 */
837 static int dvb_ca_en50221_slot_shutdown(struct dvb_ca_private *ca, int slot)
838 {
839 dprintk("%s\n", __func__);
840
841 ca->pub->slot_shutdown(ca->pub, slot);
842 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_NONE;
843
844 /* need to wake up all processes to check if they're now
845 trying to write to a defunct CAM */
846 wake_up_interruptible(&ca->wait_queue);
847
848 dprintk("Slot %i shutdown\n", slot);
849
850 /* success */
851 return 0;
852 }
853 EXPORT_SYMBOL(dvb_ca_en50221_camready_irq);
854
855
856 /**
857 * dvb_ca_en50221_camready_irq - A CAMCHANGE IRQ has occurred.
858 *
859 * @ca: CA instance.
860 * @slot: Slot concerned.
861 * @change_type: One of the DVB_CA_CAMCHANGE_* values.
862 */
863 void dvb_ca_en50221_camchange_irq(struct dvb_ca_en50221 *pubca, int slot, int change_type)
864 {
865 struct dvb_ca_private *ca = pubca->private;
866
867 dprintk("CAMCHANGE IRQ slot:%i change_type:%i\n", slot, change_type);
868
869 switch (change_type) {
870 case DVB_CA_EN50221_CAMCHANGE_REMOVED:
871 case DVB_CA_EN50221_CAMCHANGE_INSERTED:
872 break;
873
874 default:
875 return;
876 }
877
878 ca->slot_info[slot].camchange_type = change_type;
879 atomic_inc(&ca->slot_info[slot].camchange_count);
880 dvb_ca_en50221_thread_wakeup(ca);
881 }
882 EXPORT_SYMBOL(dvb_ca_en50221_frda_irq);
883
884
885 /**
886 * dvb_ca_en50221_camready_irq - A CAMREADY IRQ has occurred.
887 *
888 * @ca: CA instance.
889 * @slot: Slot concerned.
890 */
891 void dvb_ca_en50221_camready_irq(struct dvb_ca_en50221 *pubca, int slot)
892 {
893 struct dvb_ca_private *ca = pubca->private;
894
895 dprintk("CAMREADY IRQ slot:%i\n", slot);
896
897 if (ca->slot_info[slot].slot_state == DVB_CA_SLOTSTATE_WAITREADY) {
898 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_VALIDATE;
899 dvb_ca_en50221_thread_wakeup(ca);
900 }
901 }
902
903
904 /**
905 * An FR or DA IRQ has occurred.
906 *
907 * @ca: CA instance.
908 * @slot: Slot concerned.
909 */
910 void dvb_ca_en50221_frda_irq(struct dvb_ca_en50221 *pubca, int slot)
911 {
912 struct dvb_ca_private *ca = pubca->private;
913 int flags;
914
915 dprintk("FR/DA IRQ slot:%i\n", slot);
916
917 switch (ca->slot_info[slot].slot_state) {
918 case DVB_CA_SLOTSTATE_LINKINIT:
919 flags = ca->pub->read_cam_control(pubca, slot, CTRLIF_STATUS);
920 if (flags & STATUSREG_DA) {
921 dprintk("CAM supports DA IRQ\n");
922 ca->slot_info[slot].da_irq_supported = 1;
923 }
924 break;
925
926 case DVB_CA_SLOTSTATE_RUNNING:
927 if (ca->open)
928 dvb_ca_en50221_thread_wakeup(ca);
929 break;
930 }
931 }
932
933
934
935 /* ******************************************************************************** */
936 /* EN50221 thread functions */
937
938 /**
939 * Wake up the DVB CA thread
940 *
941 * @ca: CA instance.
942 */
943 static void dvb_ca_en50221_thread_wakeup(struct dvb_ca_private *ca)
944 {
945
946 dprintk("%s\n", __func__);
947
948 ca->wakeup = 1;
949 mb();
950 wake_up_process(ca->thread);
951 }
952
953 /**
954 * Update the delay used by the thread.
955 *
956 * @ca: CA instance.
957 */
958 static void dvb_ca_en50221_thread_update_delay(struct dvb_ca_private *ca)
959 {
960 int delay;
961 int curdelay = 100000000;
962 int slot;
963
964 /* Beware of too high polling frequency, because one polling
965 * call might take several hundred milliseconds until timeout!
966 */
967 for (slot = 0; slot < ca->slot_count; slot++) {
968 switch (ca->slot_info[slot].slot_state) {
969 default:
970 case DVB_CA_SLOTSTATE_NONE:
971 delay = HZ * 60; /* 60s */
972 if (!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE))
973 delay = HZ * 5; /* 5s */
974 break;
975 case DVB_CA_SLOTSTATE_INVALID:
976 delay = HZ * 60; /* 60s */
977 if (!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE))
978 delay = HZ / 10; /* 100ms */
979 break;
980
981 case DVB_CA_SLOTSTATE_UNINITIALISED:
982 case DVB_CA_SLOTSTATE_WAITREADY:
983 case DVB_CA_SLOTSTATE_VALIDATE:
984 case DVB_CA_SLOTSTATE_WAITFR:
985 case DVB_CA_SLOTSTATE_LINKINIT:
986 delay = HZ / 10; /* 100ms */
987 break;
988
989 case DVB_CA_SLOTSTATE_RUNNING:
990 delay = HZ * 60; /* 60s */
991 if (!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE))
992 delay = HZ / 10; /* 100ms */
993 if (ca->open) {
994 if ((!ca->slot_info[slot].da_irq_supported) ||
995 (!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_DA)))
996 delay = HZ / 10; /* 100ms */
997 }
998 break;
999 }
1000
1001 if (delay < curdelay)
1002 curdelay = delay;
1003 }
1004
1005 ca->delay = curdelay;
1006 }
1007
1008
1009
1010 /**
1011 * Kernel thread which monitors CA slots for CAM changes, and performs data transfers.
1012 */
1013 static int dvb_ca_en50221_thread(void *data)
1014 {
1015 struct dvb_ca_private *ca = data;
1016 int slot;
1017 int flags;
1018 int status;
1019 int pktcount;
1020 void *rxbuf;
1021
1022 dprintk("%s\n", __func__);
1023
1024 /* choose the correct initial delay */
1025 dvb_ca_en50221_thread_update_delay(ca);
1026
1027 /* main loop */
1028 while (!kthread_should_stop()) {
1029 /* sleep for a bit */
1030 if (!ca->wakeup) {
1031 set_current_state(TASK_INTERRUPTIBLE);
1032 schedule_timeout(ca->delay);
1033 if (kthread_should_stop())
1034 return 0;
1035 }
1036 ca->wakeup = 0;
1037
1038 /* go through all the slots processing them */
1039 for (slot = 0; slot < ca->slot_count; slot++) {
1040
1041 mutex_lock(&ca->slot_info[slot].slot_lock);
1042
1043 // check the cam status + deal with CAMCHANGEs
1044 while (dvb_ca_en50221_check_camstatus(ca, slot)) {
1045 /* clear down an old CI slot if necessary */
1046 if (ca->slot_info[slot].slot_state != DVB_CA_SLOTSTATE_NONE)
1047 dvb_ca_en50221_slot_shutdown(ca, slot);
1048
1049 /* if a CAM is NOW present, initialise it */
1050 if (ca->slot_info[slot].camchange_type == DVB_CA_EN50221_CAMCHANGE_INSERTED) {
1051 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_UNINITIALISED;
1052 }
1053
1054 /* we've handled one CAMCHANGE */
1055 dvb_ca_en50221_thread_update_delay(ca);
1056 atomic_dec(&ca->slot_info[slot].camchange_count);
1057 }
1058
1059 // CAM state machine
1060 switch (ca->slot_info[slot].slot_state) {
1061 case DVB_CA_SLOTSTATE_NONE:
1062 case DVB_CA_SLOTSTATE_INVALID:
1063 // no action needed
1064 break;
1065
1066 case DVB_CA_SLOTSTATE_UNINITIALISED:
1067 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_WAITREADY;
1068 ca->pub->slot_reset(ca->pub, slot);
1069 ca->slot_info[slot].timeout = jiffies + (INIT_TIMEOUT_SECS * HZ);
1070 break;
1071
1072 case DVB_CA_SLOTSTATE_WAITREADY:
1073 if (time_after(jiffies, ca->slot_info[slot].timeout)) {
1074 pr_err("dvb_ca adaptor %d: PC card did not respond :(\n",
1075 ca->dvbdev->adapter->num);
1076 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID;
1077 dvb_ca_en50221_thread_update_delay(ca);
1078 break;
1079 }
1080 // no other action needed; will automatically change state when ready
1081 break;
1082
1083 case DVB_CA_SLOTSTATE_VALIDATE:
1084 if (dvb_ca_en50221_parse_attributes(ca, slot) != 0) {
1085 /* we need this extra check for annoying interfaces like the budget-av */
1086 if ((!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE)) &&
1087 (ca->pub->poll_slot_status)) {
1088 status = ca->pub->poll_slot_status(ca->pub, slot, 0);
1089 if (!(status & DVB_CA_EN50221_POLL_CAM_PRESENT)) {
1090 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_NONE;
1091 dvb_ca_en50221_thread_update_delay(ca);
1092 break;
1093 }
1094 }
1095
1096 pr_err("dvb_ca adapter %d: Invalid PC card inserted :(\n",
1097 ca->dvbdev->adapter->num);
1098 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID;
1099 dvb_ca_en50221_thread_update_delay(ca);
1100 break;
1101 }
1102 if (dvb_ca_en50221_set_configoption(ca, slot) != 0) {
1103 pr_err("dvb_ca adapter %d: Unable to initialise CAM :(\n",
1104 ca->dvbdev->adapter->num);
1105 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID;
1106 dvb_ca_en50221_thread_update_delay(ca);
1107 break;
1108 }
1109 if (ca->pub->write_cam_control(ca->pub, slot,
1110 CTRLIF_COMMAND, CMDREG_RS) != 0) {
1111 pr_err("dvb_ca adapter %d: Unable to reset CAM IF\n",
1112 ca->dvbdev->adapter->num);
1113 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID;
1114 dvb_ca_en50221_thread_update_delay(ca);
1115 break;
1116 }
1117 dprintk("DVB CAM validated successfully\n");
1118
1119 ca->slot_info[slot].timeout = jiffies + (INIT_TIMEOUT_SECS * HZ);
1120 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_WAITFR;
1121 ca->wakeup = 1;
1122 break;
1123
1124 case DVB_CA_SLOTSTATE_WAITFR:
1125 if (time_after(jiffies, ca->slot_info[slot].timeout)) {
1126 pr_err("dvb_ca adapter %d: DVB CAM did not respond :(\n",
1127 ca->dvbdev->adapter->num);
1128 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID;
1129 dvb_ca_en50221_thread_update_delay(ca);
1130 break;
1131 }
1132
1133 flags = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS);
1134 if (flags & STATUSREG_FR) {
1135 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_LINKINIT;
1136 ca->wakeup = 1;
1137 }
1138 break;
1139
1140 case DVB_CA_SLOTSTATE_LINKINIT:
1141 if (dvb_ca_en50221_link_init(ca, slot) != 0) {
1142 /* we need this extra check for annoying interfaces like the budget-av */
1143 if ((!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE)) &&
1144 (ca->pub->poll_slot_status)) {
1145 status = ca->pub->poll_slot_status(ca->pub, slot, 0);
1146 if (!(status & DVB_CA_EN50221_POLL_CAM_PRESENT)) {
1147 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_NONE;
1148 dvb_ca_en50221_thread_update_delay(ca);
1149 break;
1150 }
1151 }
1152
1153 pr_err("dvb_ca adapter %d: DVB CAM link initialisation failed :(\n",
1154 ca->dvbdev->adapter->num);
1155 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID;
1156 dvb_ca_en50221_thread_update_delay(ca);
1157 break;
1158 }
1159
1160 if (ca->slot_info[slot].rx_buffer.data == NULL) {
1161 rxbuf = vmalloc(RX_BUFFER_SIZE);
1162 if (rxbuf == NULL) {
1163 pr_err("dvb_ca adapter %d: Unable to allocate CAM rx buffer :(\n",
1164 ca->dvbdev->adapter->num);
1165 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID;
1166 dvb_ca_en50221_thread_update_delay(ca);
1167 break;
1168 }
1169 dvb_ringbuffer_init(&ca->slot_info[slot].rx_buffer, rxbuf, RX_BUFFER_SIZE);
1170 }
1171
1172 ca->pub->slot_ts_enable(ca->pub, slot);
1173 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_RUNNING;
1174 dvb_ca_en50221_thread_update_delay(ca);
1175 pr_err("dvb_ca adapter %d: DVB CAM detected and initialised successfully\n",
1176 ca->dvbdev->adapter->num);
1177 break;
1178
1179 case DVB_CA_SLOTSTATE_RUNNING:
1180 if (!ca->open)
1181 break;
1182
1183 // poll slots for data
1184 pktcount = 0;
1185 while ((status = dvb_ca_en50221_read_data(ca, slot, NULL, 0)) > 0) {
1186 if (!ca->open)
1187 break;
1188
1189 /* if a CAMCHANGE occurred at some point, do not do any more processing of this slot */
1190 if (dvb_ca_en50221_check_camstatus(ca, slot)) {
1191 // we dont want to sleep on the next iteration so we can handle the cam change
1192 ca->wakeup = 1;
1193 break;
1194 }
1195
1196 /* check if we've hit our limit this time */
1197 if (++pktcount >= MAX_RX_PACKETS_PER_ITERATION) {
1198 // dont sleep; there is likely to be more data to read
1199 ca->wakeup = 1;
1200 break;
1201 }
1202 }
1203 break;
1204 }
1205
1206 mutex_unlock(&ca->slot_info[slot].slot_lock);
1207 }
1208 }
1209
1210 return 0;
1211 }
1212
1213
1214
1215 /* ******************************************************************************** */
1216 /* EN50221 IO interface functions */
1217
1218 /**
1219 * Real ioctl implementation.
1220 * NOTE: CA_SEND_MSG/CA_GET_MSG ioctls have userspace buffers passed to them.
1221 *
1222 * @inode: Inode concerned.
1223 * @file: File concerned.
1224 * @cmd: IOCTL command.
1225 * @arg: Associated argument.
1226 *
1227 * @return 0 on success, <0 on error.
1228 */
1229 static int dvb_ca_en50221_io_do_ioctl(struct file *file,
1230 unsigned int cmd, void *parg)
1231 {
1232 struct dvb_device *dvbdev = file->private_data;
1233 struct dvb_ca_private *ca = dvbdev->priv;
1234 int err = 0;
1235 int slot;
1236
1237 dprintk("%s\n", __func__);
1238
1239 if (mutex_lock_interruptible(&ca->ioctl_mutex))
1240 return -ERESTARTSYS;
1241
1242 switch (cmd) {
1243 case CA_RESET:
1244 for (slot = 0; slot < ca->slot_count; slot++) {
1245 mutex_lock(&ca->slot_info[slot].slot_lock);
1246 if (ca->slot_info[slot].slot_state != DVB_CA_SLOTSTATE_NONE) {
1247 dvb_ca_en50221_slot_shutdown(ca, slot);
1248 if (ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE)
1249 dvb_ca_en50221_camchange_irq(ca->pub,
1250 slot,
1251 DVB_CA_EN50221_CAMCHANGE_INSERTED);
1252 }
1253 mutex_unlock(&ca->slot_info[slot].slot_lock);
1254 }
1255 ca->next_read_slot = 0;
1256 dvb_ca_en50221_thread_wakeup(ca);
1257 break;
1258
1259 case CA_GET_CAP: {
1260 struct ca_caps *caps = parg;
1261
1262 caps->slot_num = ca->slot_count;
1263 caps->slot_type = CA_CI_LINK;
1264 caps->descr_num = 0;
1265 caps->descr_type = 0;
1266 break;
1267 }
1268
1269 case CA_GET_SLOT_INFO: {
1270 struct ca_slot_info *info = parg;
1271
1272 if ((info->num > ca->slot_count) || (info->num < 0)) {
1273 err = -EINVAL;
1274 goto out_unlock;
1275 }
1276
1277 info->type = CA_CI_LINK;
1278 info->flags = 0;
1279 if ((ca->slot_info[info->num].slot_state != DVB_CA_SLOTSTATE_NONE)
1280 && (ca->slot_info[info->num].slot_state != DVB_CA_SLOTSTATE_INVALID)) {
1281 info->flags = CA_CI_MODULE_PRESENT;
1282 }
1283 if (ca->slot_info[info->num].slot_state == DVB_CA_SLOTSTATE_RUNNING) {
1284 info->flags |= CA_CI_MODULE_READY;
1285 }
1286 break;
1287 }
1288
1289 default:
1290 err = -EINVAL;
1291 break;
1292 }
1293
1294 out_unlock:
1295 mutex_unlock(&ca->ioctl_mutex);
1296 return err;
1297 }
1298
1299
1300 /**
1301 * Wrapper for ioctl implementation.
1302 *
1303 * @inode: Inode concerned.
1304 * @file: File concerned.
1305 * @cmd: IOCTL command.
1306 * @arg: Associated argument.
1307 *
1308 * @return 0 on success, <0 on error.
1309 */
1310 static long dvb_ca_en50221_io_ioctl(struct file *file,
1311 unsigned int cmd, unsigned long arg)
1312 {
1313 return dvb_usercopy(file, cmd, arg, dvb_ca_en50221_io_do_ioctl);
1314 }
1315
1316
1317 /**
1318 * Implementation of write() syscall.
1319 *
1320 * @file: File structure.
1321 * @buf: Source buffer.
1322 * @count: Size of source buffer.
1323 * @ppos: Position in file (ignored).
1324 *
1325 * @return Number of bytes read, or <0 on error.
1326 */
1327 static ssize_t dvb_ca_en50221_io_write(struct file *file,
1328 const char __user * buf, size_t count, loff_t * ppos)
1329 {
1330 struct dvb_device *dvbdev = file->private_data;
1331 struct dvb_ca_private *ca = dvbdev->priv;
1332 u8 slot, connection_id;
1333 int status;
1334 u8 fragbuf[HOST_LINK_BUF_SIZE];
1335 int fragpos = 0;
1336 int fraglen;
1337 unsigned long timeout;
1338 int written;
1339
1340 dprintk("%s\n", __func__);
1341
1342 /* Incoming packet has a 2 byte header. hdr[0] = slot_id, hdr[1] = connection_id */
1343 if (count < 2)
1344 return -EINVAL;
1345
1346 /* extract slot & connection id */
1347 if (copy_from_user(&slot, buf, 1))
1348 return -EFAULT;
1349 if (copy_from_user(&connection_id, buf + 1, 1))
1350 return -EFAULT;
1351 buf += 2;
1352 count -= 2;
1353
1354 /* check if the slot is actually running */
1355 if (ca->slot_info[slot].slot_state != DVB_CA_SLOTSTATE_RUNNING)
1356 return -EINVAL;
1357
1358 /* fragment the packets & store in the buffer */
1359 while (fragpos < count) {
1360 fraglen = ca->slot_info[slot].link_buf_size - 2;
1361 if (fraglen < 0)
1362 break;
1363 if (fraglen > HOST_LINK_BUF_SIZE - 2)
1364 fraglen = HOST_LINK_BUF_SIZE - 2;
1365 if ((count - fragpos) < fraglen)
1366 fraglen = count - fragpos;
1367
1368 fragbuf[0] = connection_id;
1369 fragbuf[1] = ((fragpos + fraglen) < count) ? 0x80 : 0x00;
1370 status = copy_from_user(fragbuf + 2, buf + fragpos, fraglen);
1371 if (status) {
1372 status = -EFAULT;
1373 goto exit;
1374 }
1375
1376 timeout = jiffies + HZ / 2;
1377 written = 0;
1378 while (!time_after(jiffies, timeout)) {
1379 /* check the CAM hasn't been removed/reset in the meantime */
1380 if (ca->slot_info[slot].slot_state != DVB_CA_SLOTSTATE_RUNNING) {
1381 status = -EIO;
1382 goto exit;
1383 }
1384
1385 mutex_lock(&ca->slot_info[slot].slot_lock);
1386 status = dvb_ca_en50221_write_data(ca, slot, fragbuf, fraglen + 2);
1387 mutex_unlock(&ca->slot_info[slot].slot_lock);
1388 if (status == (fraglen + 2)) {
1389 written = 1;
1390 break;
1391 }
1392 if (status != -EAGAIN)
1393 goto exit;
1394
1395 msleep(1);
1396 }
1397 if (!written) {
1398 status = -EIO;
1399 goto exit;
1400 }
1401
1402 fragpos += fraglen;
1403 }
1404 status = count + 2;
1405
1406 exit:
1407 return status;
1408 }
1409
1410
1411 /**
1412 * Condition for waking up in dvb_ca_en50221_io_read_condition
1413 */
1414 static int dvb_ca_en50221_io_read_condition(struct dvb_ca_private *ca,
1415 int *result, int *_slot)
1416 {
1417 int slot;
1418 int slot_count = 0;
1419 int idx;
1420 size_t fraglen;
1421 int connection_id = -1;
1422 int found = 0;
1423 u8 hdr[2];
1424
1425 slot = ca->next_read_slot;
1426 while ((slot_count < ca->slot_count) && (!found)) {
1427 if (ca->slot_info[slot].slot_state != DVB_CA_SLOTSTATE_RUNNING)
1428 goto nextslot;
1429
1430 if (ca->slot_info[slot].rx_buffer.data == NULL) {
1431 return 0;
1432 }
1433
1434 idx = dvb_ringbuffer_pkt_next(&ca->slot_info[slot].rx_buffer, -1, &fraglen);
1435 while (idx != -1) {
1436 dvb_ringbuffer_pkt_read(&ca->slot_info[slot].rx_buffer, idx, 0, hdr, 2);
1437 if (connection_id == -1)
1438 connection_id = hdr[0];
1439 if ((hdr[0] == connection_id) && ((hdr[1] & 0x80) == 0)) {
1440 *_slot = slot;
1441 found = 1;
1442 break;
1443 }
1444
1445 idx = dvb_ringbuffer_pkt_next(&ca->slot_info[slot].rx_buffer, idx, &fraglen);
1446 }
1447
1448 nextslot:
1449 slot = (slot + 1) % ca->slot_count;
1450 slot_count++;
1451 }
1452
1453 ca->next_read_slot = slot;
1454 return found;
1455 }
1456
1457
1458 /**
1459 * Implementation of read() syscall.
1460 *
1461 * @file: File structure.
1462 * @buf: Destination buffer.
1463 * @count: Size of destination buffer.
1464 * @ppos: Position in file (ignored).
1465 *
1466 * @return Number of bytes read, or <0 on error.
1467 */
1468 static ssize_t dvb_ca_en50221_io_read(struct file *file, char __user * buf,
1469 size_t count, loff_t * ppos)
1470 {
1471 struct dvb_device *dvbdev = file->private_data;
1472 struct dvb_ca_private *ca = dvbdev->priv;
1473 int status;
1474 int result = 0;
1475 u8 hdr[2];
1476 int slot;
1477 int connection_id = -1;
1478 size_t idx, idx2;
1479 int last_fragment = 0;
1480 size_t fraglen;
1481 int pktlen;
1482 int dispose = 0;
1483
1484 dprintk("%s\n", __func__);
1485
1486 /* Outgoing packet has a 2 byte header. hdr[0] = slot_id, hdr[1] = connection_id */
1487 if (count < 2)
1488 return -EINVAL;
1489
1490 /* wait for some data */
1491 if ((status = dvb_ca_en50221_io_read_condition(ca, &result, &slot)) == 0) {
1492
1493 /* if we're in nonblocking mode, exit immediately */
1494 if (file->f_flags & O_NONBLOCK)
1495 return -EWOULDBLOCK;
1496
1497 /* wait for some data */
1498 status = wait_event_interruptible(ca->wait_queue,
1499 dvb_ca_en50221_io_read_condition
1500 (ca, &result, &slot));
1501 }
1502 if ((status < 0) || (result < 0)) {
1503 if (result)
1504 return result;
1505 return status;
1506 }
1507
1508 idx = dvb_ringbuffer_pkt_next(&ca->slot_info[slot].rx_buffer, -1, &fraglen);
1509 pktlen = 2;
1510 do {
1511 if (idx == -1) {
1512 pr_err("dvb_ca adapter %d: BUG: read packet ended before last_fragment encountered\n",
1513 ca->dvbdev->adapter->num);
1514 status = -EIO;
1515 goto exit;
1516 }
1517
1518 dvb_ringbuffer_pkt_read(&ca->slot_info[slot].rx_buffer, idx, 0, hdr, 2);
1519 if (connection_id == -1)
1520 connection_id = hdr[0];
1521 if (hdr[0] == connection_id) {
1522 if (pktlen < count) {
1523 if ((pktlen + fraglen - 2) > count) {
1524 fraglen = count - pktlen;
1525 } else {
1526 fraglen -= 2;
1527 }
1528
1529 if ((status = dvb_ringbuffer_pkt_read_user(&ca->slot_info[slot].rx_buffer, idx, 2,
1530 buf + pktlen, fraglen)) < 0) {
1531 goto exit;
1532 }
1533 pktlen += fraglen;
1534 }
1535
1536 if ((hdr[1] & 0x80) == 0)
1537 last_fragment = 1;
1538 dispose = 1;
1539 }
1540
1541 idx2 = dvb_ringbuffer_pkt_next(&ca->slot_info[slot].rx_buffer, idx, &fraglen);
1542 if (dispose)
1543 dvb_ringbuffer_pkt_dispose(&ca->slot_info[slot].rx_buffer, idx);
1544 idx = idx2;
1545 dispose = 0;
1546 } while (!last_fragment);
1547
1548 hdr[0] = slot;
1549 hdr[1] = connection_id;
1550 status = copy_to_user(buf, hdr, 2);
1551 if (status) {
1552 status = -EFAULT;
1553 goto exit;
1554 }
1555 status = pktlen;
1556
1557 exit:
1558 return status;
1559 }
1560
1561
1562 /**
1563 * Implementation of file open syscall.
1564 *
1565 * @inode: Inode concerned.
1566 * @file: File concerned.
1567 *
1568 * @return 0 on success, <0 on failure.
1569 */
1570 static int dvb_ca_en50221_io_open(struct inode *inode, struct file *file)
1571 {
1572 struct dvb_device *dvbdev = file->private_data;
1573 struct dvb_ca_private *ca = dvbdev->priv;
1574 int err;
1575 int i;
1576
1577 dprintk("%s\n", __func__);
1578
1579 if (!try_module_get(ca->pub->owner))
1580 return -EIO;
1581
1582 err = dvb_generic_open(inode, file);
1583 if (err < 0) {
1584 module_put(ca->pub->owner);
1585 return err;
1586 }
1587
1588 for (i = 0; i < ca->slot_count; i++) {
1589
1590 if (ca->slot_info[i].slot_state == DVB_CA_SLOTSTATE_RUNNING) {
1591 if (ca->slot_info[i].rx_buffer.data != NULL) {
1592 /* it is safe to call this here without locks because
1593 * ca->open == 0. Data is not read in this case */
1594 dvb_ringbuffer_flush(&ca->slot_info[i].rx_buffer);
1595 }
1596 }
1597 }
1598
1599 ca->open = 1;
1600 dvb_ca_en50221_thread_update_delay(ca);
1601 dvb_ca_en50221_thread_wakeup(ca);
1602
1603 dvb_ca_private_get(ca);
1604
1605 return 0;
1606 }
1607
1608
1609 /**
1610 * Implementation of file close syscall.
1611 *
1612 * @inode: Inode concerned.
1613 * @file: File concerned.
1614 *
1615 * @return 0 on success, <0 on failure.
1616 */
1617 static int dvb_ca_en50221_io_release(struct inode *inode, struct file *file)
1618 {
1619 struct dvb_device *dvbdev = file->private_data;
1620 struct dvb_ca_private *ca = dvbdev->priv;
1621 int err;
1622
1623 dprintk("%s\n", __func__);
1624
1625 /* mark the CA device as closed */
1626 ca->open = 0;
1627 dvb_ca_en50221_thread_update_delay(ca);
1628
1629 err = dvb_generic_release(inode, file);
1630
1631 module_put(ca->pub->owner);
1632
1633 dvb_ca_private_put(ca);
1634
1635 return err;
1636 }
1637
1638
1639 /**
1640 * Implementation of poll() syscall.
1641 *
1642 * @file: File concerned.
1643 * @wait: poll wait table.
1644 *
1645 * @return Standard poll mask.
1646 */
1647 static unsigned int dvb_ca_en50221_io_poll(struct file *file, poll_table * wait)
1648 {
1649 struct dvb_device *dvbdev = file->private_data;
1650 struct dvb_ca_private *ca = dvbdev->priv;
1651 unsigned int mask = 0;
1652 int slot;
1653 int result = 0;
1654
1655 dprintk("%s\n", __func__);
1656
1657 if (dvb_ca_en50221_io_read_condition(ca, &result, &slot) == 1) {
1658 mask |= POLLIN;
1659 }
1660
1661 /* if there is something, return now */
1662 if (mask)
1663 return mask;
1664
1665 /* wait for something to happen */
1666 poll_wait(file, &ca->wait_queue, wait);
1667
1668 if (dvb_ca_en50221_io_read_condition(ca, &result, &slot) == 1) {
1669 mask |= POLLIN;
1670 }
1671
1672 return mask;
1673 }
1674 EXPORT_SYMBOL(dvb_ca_en50221_init);
1675
1676
1677 static const struct file_operations dvb_ca_fops = {
1678 .owner = THIS_MODULE,
1679 .read = dvb_ca_en50221_io_read,
1680 .write = dvb_ca_en50221_io_write,
1681 .unlocked_ioctl = dvb_ca_en50221_io_ioctl,
1682 .open = dvb_ca_en50221_io_open,
1683 .release = dvb_ca_en50221_io_release,
1684 .poll = dvb_ca_en50221_io_poll,
1685 .llseek = noop_llseek,
1686 };
1687
1688 static const struct dvb_device dvbdev_ca = {
1689 .priv = NULL,
1690 .users = 1,
1691 .readers = 1,
1692 .writers = 1,
1693 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
1694 .name = "dvb-ca-en50221",
1695 #endif
1696 .fops = &dvb_ca_fops,
1697 };
1698
1699 /* ******************************************************************************** */
1700 /* Initialisation/shutdown functions */
1701
1702
1703 /**
1704 * Initialise a new DVB CA EN50221 interface device.
1705 *
1706 * @dvb_adapter: DVB adapter to attach the new CA device to.
1707 * @ca: The dvb_ca instance.
1708 * @flags: Flags describing the CA device (DVB_CA_FLAG_*).
1709 * @slot_count: Number of slots supported.
1710 *
1711 * @return 0 on success, nonzero on failure
1712 */
1713 int dvb_ca_en50221_init(struct dvb_adapter *dvb_adapter,
1714 struct dvb_ca_en50221 *pubca, int flags, int slot_count)
1715 {
1716 int ret;
1717 struct dvb_ca_private *ca = NULL;
1718 int i;
1719
1720 dprintk("%s\n", __func__);
1721
1722 if (slot_count < 1)
1723 return -EINVAL;
1724
1725 /* initialise the system data */
1726 if ((ca = kzalloc(sizeof(struct dvb_ca_private), GFP_KERNEL)) == NULL) {
1727 ret = -ENOMEM;
1728 goto exit;
1729 }
1730 kref_init(&ca->refcount);
1731 ca->pub = pubca;
1732 ca->flags = flags;
1733 ca->slot_count = slot_count;
1734 if ((ca->slot_info = kcalloc(slot_count, sizeof(struct dvb_ca_slot), GFP_KERNEL)) == NULL) {
1735 ret = -ENOMEM;
1736 goto free_ca;
1737 }
1738 init_waitqueue_head(&ca->wait_queue);
1739 ca->open = 0;
1740 ca->wakeup = 0;
1741 ca->next_read_slot = 0;
1742 pubca->private = ca;
1743
1744 /* register the DVB device */
1745 ret = dvb_register_device(dvb_adapter, &ca->dvbdev, &dvbdev_ca, ca, DVB_DEVICE_CA, 0);
1746 if (ret)
1747 goto free_slot_info;
1748
1749 /* now initialise each slot */
1750 for (i = 0; i < slot_count; i++) {
1751 memset(&ca->slot_info[i], 0, sizeof(struct dvb_ca_slot));
1752 ca->slot_info[i].slot_state = DVB_CA_SLOTSTATE_NONE;
1753 atomic_set(&ca->slot_info[i].camchange_count, 0);
1754 ca->slot_info[i].camchange_type = DVB_CA_EN50221_CAMCHANGE_REMOVED;
1755 mutex_init(&ca->slot_info[i].slot_lock);
1756 }
1757
1758 mutex_init(&ca->ioctl_mutex);
1759
1760 if (signal_pending(current)) {
1761 ret = -EINTR;
1762 goto unregister_device;
1763 }
1764 mb();
1765
1766 /* create a kthread for monitoring this CA device */
1767 ca->thread = kthread_run(dvb_ca_en50221_thread, ca, "kdvb-ca-%i:%i",
1768 ca->dvbdev->adapter->num, ca->dvbdev->id);
1769 if (IS_ERR(ca->thread)) {
1770 ret = PTR_ERR(ca->thread);
1771 pr_err("dvb_ca_init: failed to start kernel_thread (%d)\n",
1772 ret);
1773 goto unregister_device;
1774 }
1775 return 0;
1776
1777 unregister_device:
1778 dvb_unregister_device(ca->dvbdev);
1779 free_slot_info:
1780 kfree(ca->slot_info);
1781 free_ca:
1782 kfree(ca);
1783 exit:
1784 pubca->private = NULL;
1785 return ret;
1786 }
1787 EXPORT_SYMBOL(dvb_ca_en50221_release);
1788
1789
1790
1791 /**
1792 * Release a DVB CA EN50221 interface device.
1793 *
1794 * @ca_dev: The dvb_device_t instance for the CA device.
1795 * @ca: The associated dvb_ca instance.
1796 */
1797 void dvb_ca_en50221_release(struct dvb_ca_en50221 *pubca)
1798 {
1799 struct dvb_ca_private *ca = pubca->private;
1800 int i;
1801
1802 dprintk("%s\n", __func__);
1803
1804 /* shutdown the thread if there was one */
1805 kthread_stop(ca->thread);
1806
1807 for (i = 0; i < ca->slot_count; i++) {
1808 dvb_ca_en50221_slot_shutdown(ca, i);
1809 }
1810 dvb_remove_device(ca->dvbdev);
1811 dvb_ca_private_put(ca);
1812 pubca->private = NULL;
1813 }
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