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Merge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[cris-mirror.git] / drivers / media / dvb-core / dvb_ca_en50221.c
blobb5b5b195ea7f04d1feb40b2967b43cb174b1bf7e
1 /*
2 * dvb_ca.c: generic DVB functions for EN50221 CAM interfaces
3 *
4 * Copyright (C) 2004 Andrew de Quincey
5 *
6 * Parts of this file were based on sources as follows:
7 *
8 * Copyright (C) 2003 Ralph Metzler <rjkm@metzlerbros.de>
9 *
10 * based on code:
11 *
12 * Copyright (C) 1999-2002 Ralph Metzler
13 * & Marcus Metzler for convergence integrated media GmbH
14 *
15 * This program is free software; you can redistribute it and/or
16 * modify it under the terms of the GNU General Public License
17 * as published by the Free Software Foundation; either version 2
18 * of the License, or (at your option) any later version.
19 *
20 * This program is distributed in the hope that it will be useful,
21 * but WITHOUT ANY WARRANTY; without even the implied warranty of
22 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
23 * GNU General Public License for more details.
24 *
25 * You should have received a copy of the GNU General Public License
26 * along with this program; if not, write to the Free Software
27 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
28 * Or, point your browser to http://www.gnu.org/copyleft/gpl.html
29 */
30
31 #include <linux/errno.h>
32 #include <linux/slab.h>
33 #include <linux/list.h>
34 #include <linux/module.h>
35 #include <linux/vmalloc.h>
36 #include <linux/delay.h>
37 #include <linux/spinlock.h>
38 #include <linux/sched.h>
39 #include <linux/kthread.h>
40
41 #include "dvb_ca_en50221.h"
42 #include "dvb_ringbuffer.h"
43
44 static int dvb_ca_en50221_debug;
45
46 module_param_named(cam_debug, dvb_ca_en50221_debug, int, 0644);
47 MODULE_PARM_DESC(cam_debug, "enable verbose debug messages");
48
49 #define dprintk if (dvb_ca_en50221_debug) printk
50
51 #define INIT_TIMEOUT_SECS 10
52
53 #define HOST_LINK_BUF_SIZE 0x200
54
55 #define RX_BUFFER_SIZE 65535
56
57 #define MAX_RX_PACKETS_PER_ITERATION 10
58
59 #define CTRLIF_DATA 0
60 #define CTRLIF_COMMAND 1
61 #define CTRLIF_STATUS 1
62 #define CTRLIF_SIZE_LOW 2
63 #define CTRLIF_SIZE_HIGH 3
64
65 #define CMDREG_HC 1 /* Host control */
66 #define CMDREG_SW 2 /* Size write */
67 #define CMDREG_SR 4 /* Size read */
68 #define CMDREG_RS 8 /* Reset interface */
69 #define CMDREG_FRIE 0x40 /* Enable FR interrupt */
70 #define CMDREG_DAIE 0x80 /* Enable DA interrupt */
71 #define IRQEN (CMDREG_DAIE)
72
73 #define STATUSREG_RE 1 /* read error */
74 #define STATUSREG_WE 2 /* write error */
75 #define STATUSREG_FR 0x40 /* module free */
76 #define STATUSREG_DA 0x80 /* data available */
77 #define STATUSREG_TXERR (STATUSREG_RE|STATUSREG_WE) /* general transfer error */
78
79
80 #define DVB_CA_SLOTSTATE_NONE 0
81 #define DVB_CA_SLOTSTATE_UNINITIALISED 1
82 #define DVB_CA_SLOTSTATE_RUNNING 2
83 #define DVB_CA_SLOTSTATE_INVALID 3
84 #define DVB_CA_SLOTSTATE_WAITREADY 4
85 #define DVB_CA_SLOTSTATE_VALIDATE 5
86 #define DVB_CA_SLOTSTATE_WAITFR 6
87 #define DVB_CA_SLOTSTATE_LINKINIT 7
88
89
90 /* Information on a CA slot */
91 struct dvb_ca_slot {
92
93 /* current state of the CAM */
94 int slot_state;
95
96 /* mutex used for serializing access to one CI slot */
97 struct mutex slot_lock;
98
99 /* Number of CAMCHANGES that have occurred since last processing */
100 atomic_t camchange_count;
101
102 /* Type of last CAMCHANGE */
103 int camchange_type;
104
105 /* base address of CAM config */
106 u32 config_base;
107
108 /* value to write into Config Control register */
109 u8 config_option;
110
111 /* if 1, the CAM supports DA IRQs */
112 u8 da_irq_supported:1;
113
114 /* size of the buffer to use when talking to the CAM */
115 int link_buf_size;
116
117 /* buffer for incoming packets */
118 struct dvb_ringbuffer rx_buffer;
119
120 /* timer used during various states of the slot */
121 unsigned long timeout;
122 };
123
124 /* Private CA-interface information */
125 struct dvb_ca_private {
126 struct kref refcount;
127
128 /* pointer back to the public data structure */
129 struct dvb_ca_en50221 *pub;
130
131 /* the DVB device */
132 struct dvb_device *dvbdev;
133
134 /* Flags describing the interface (DVB_CA_FLAG_*) */
135 u32 flags;
136
137 /* number of slots supported by this CA interface */
138 unsigned int slot_count;
139
140 /* information on each slot */
141 struct dvb_ca_slot *slot_info;
142
143 /* wait queues for read() and write() operations */
144 wait_queue_head_t wait_queue;
145
146 /* PID of the monitoring thread */
147 struct task_struct *thread;
148
149 /* Flag indicating if the CA device is open */
150 unsigned int open:1;
151
152 /* Flag indicating the thread should wake up now */
153 unsigned int wakeup:1;
154
155 /* Delay the main thread should use */
156 unsigned long delay;
157
158 /* Slot to start looking for data to read from in the next user-space read operation */
159 int next_read_slot;
160
161 /* mutex serializing ioctls */
162 struct mutex ioctl_mutex;
163 };
164
165 static void dvb_ca_private_free(struct dvb_ca_private *ca)
166 {
167 unsigned int i;
168
169 dvb_unregister_device(ca->dvbdev);
170 for (i = 0; i < ca->slot_count; i++)
171 vfree(ca->slot_info[i].rx_buffer.data);
172
173 kfree(ca->slot_info);
174 kfree(ca);
175 }
176
177 static void dvb_ca_private_release(struct kref *ref)
178 {
179 struct dvb_ca_private *ca = container_of(ref, struct dvb_ca_private, refcount);
180 dvb_ca_private_free(ca);
181 }
182
183 static void dvb_ca_private_get(struct dvb_ca_private *ca)
184 {
185 kref_get(&ca->refcount);
186 }
187
188 static void dvb_ca_private_put(struct dvb_ca_private *ca)
189 {
190 kref_put(&ca->refcount, dvb_ca_private_release);
191 }
192
193 static void dvb_ca_en50221_thread_wakeup(struct dvb_ca_private *ca);
194 static int dvb_ca_en50221_read_data(struct dvb_ca_private *ca, int slot, u8 * ebuf, int ecount);
195 static int dvb_ca_en50221_write_data(struct dvb_ca_private *ca, int slot, u8 * ebuf, int ecount);
196
197
198 /**
199 * Safely find needle in haystack.
200 *
201 * @haystack: Buffer to look in.
202 * @hlen: Number of bytes in haystack.
203 * @needle: Buffer to find.
204 * @nlen: Number of bytes in needle.
205 * @return Pointer into haystack needle was found at, or NULL if not found.
206 */
207 static char *findstr(char * haystack, int hlen, char * needle, int nlen)
208 {
209 int i;
210
211 if (hlen < nlen)
212 return NULL;
213
214 for (i = 0; i <= hlen - nlen; i++) {
215 if (!strncmp(haystack + i, needle, nlen))
216 return haystack + i;
217 }
218
219 return NULL;
220 }
221
222
223
224 /* ******************************************************************************** */
225 /* EN50221 physical interface functions */
226
227
228 /**
229 * dvb_ca_en50221_check_camstatus - Check CAM status.
230 */
231 static int dvb_ca_en50221_check_camstatus(struct dvb_ca_private *ca, int slot)
232 {
233 int slot_status;
234 int cam_present_now;
235 int cam_changed;
236
237 /* IRQ mode */
238 if (ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE) {
239 return (atomic_read(&ca->slot_info[slot].camchange_count) != 0);
240 }
241
242 /* poll mode */
243 slot_status = ca->pub->poll_slot_status(ca->pub, slot, ca->open);
244
245 cam_present_now = (slot_status & DVB_CA_EN50221_POLL_CAM_PRESENT) ? 1 : 0;
246 cam_changed = (slot_status & DVB_CA_EN50221_POLL_CAM_CHANGED) ? 1 : 0;
247 if (!cam_changed) {
248 int cam_present_old = (ca->slot_info[slot].slot_state != DVB_CA_SLOTSTATE_NONE);
249 cam_changed = (cam_present_now != cam_present_old);
250 }
251
252 if (cam_changed) {
253 if (!cam_present_now) {
254 ca->slot_info[slot].camchange_type = DVB_CA_EN50221_CAMCHANGE_REMOVED;
255 } else {
256 ca->slot_info[slot].camchange_type = DVB_CA_EN50221_CAMCHANGE_INSERTED;
257 }
258 atomic_set(&ca->slot_info[slot].camchange_count, 1);
259 } else {
260 if ((ca->slot_info[slot].slot_state == DVB_CA_SLOTSTATE_WAITREADY) &&
261 (slot_status & DVB_CA_EN50221_POLL_CAM_READY)) {
262 // move to validate state if reset is completed
263 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_VALIDATE;
264 }
265 }
266
267 return cam_changed;
268 }
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_ms: 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 /* read the status and check for error */
295 int res = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS);
296 if (res < 0)
297 return -EIO;
298
299 /* if we got the flags, it was successful! */
300 if (res & waitfor) {
301 dprintk("%s succeeded timeout:%lu\n", __func__, jiffies - start);
302 return 0;
303 }
304
305 /* check for timeout */
306 if (time_after(jiffies, timeout)) {
307 break;
308 }
309
310 /* wait for a bit */
311 msleep(1);
312 }
313
314 dprintk("%s failed timeout:%lu\n", __func__, jiffies - start);
315
316 /* if we get here, we've timed out */
317 return -ETIMEDOUT;
318 }
319
320
321 /**
322 * dvb_ca_en50221_link_init - Initialise the link layer connection to a CAM.
323 *
324 * @ca: CA instance.
325 * @slot: Slot id.
326 *
327 * @return 0 on success, nonzero on failure.
328 */
329 static int dvb_ca_en50221_link_init(struct dvb_ca_private *ca, int slot)
330 {
331 int ret;
332 int buf_size;
333 u8 buf[2];
334
335 dprintk("%s\n", __func__);
336
337 /* we'll be determining these during this function */
338 ca->slot_info[slot].da_irq_supported = 0;
339
340 /* set the host link buffer size temporarily. it will be overwritten with the
341 * real negotiated size later. */
342 ca->slot_info[slot].link_buf_size = 2;
343
344 /* read the buffer size from the CAM */
345 if ((ret = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, IRQEN | CMDREG_SR)) != 0)
346 return ret;
347 if ((ret = dvb_ca_en50221_wait_if_status(ca, slot, STATUSREG_DA, HZ / 10)) != 0)
348 return ret;
349 if ((ret = dvb_ca_en50221_read_data(ca, slot, buf, 2)) != 2)
350 return -EIO;
351 if ((ret = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, IRQEN)) != 0)
352 return ret;
353
354 /* store it, and choose the minimum of our buffer and the CAM's buffer size */
355 buf_size = (buf[0] << 8) | buf[1];
356 if (buf_size > HOST_LINK_BUF_SIZE)
357 buf_size = HOST_LINK_BUF_SIZE;
358 ca->slot_info[slot].link_buf_size = buf_size;
359 buf[0] = buf_size >> 8;
360 buf[1] = buf_size & 0xff;
361 dprintk("Chosen link buffer size of %i\n", buf_size);
362
363 /* write the buffer size to the CAM */
364 if ((ret = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, IRQEN | CMDREG_SW)) != 0)
365 return ret;
366 if ((ret = dvb_ca_en50221_wait_if_status(ca, slot, STATUSREG_FR, HZ / 10)) != 0)
367 return ret;
368 if ((ret = dvb_ca_en50221_write_data(ca, slot, buf, 2)) != 2)
369 return -EIO;
370 if ((ret = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, IRQEN)) != 0)
371 return ret;
372
373 /* success */
374 return 0;
375 }
376
377 /**
378 * dvb_ca_en50221_read_tuple - Read a tuple from attribute memory.
379 *
380 * @ca: CA instance.
381 * @slot: Slot id.
382 * @address: Address to read from. Updated.
383 * @tupleType: Tuple id byte. Updated.
384 * @tupleLength: Tuple length. Updated.
385 * @tuple: Dest buffer for tuple (must be 256 bytes). Updated.
386 *
387 * @return 0 on success, nonzero on error.
388 */
389 static int dvb_ca_en50221_read_tuple(struct dvb_ca_private *ca, int slot,
390 int *address, int *tupleType, int *tupleLength, u8 * tuple)
391 {
392 int i;
393 int _tupleType;
394 int _tupleLength;
395 int _address = *address;
396
397 /* grab the next tuple length and type */
398 if ((_tupleType = ca->pub->read_attribute_mem(ca->pub, slot, _address)) < 0)
399 return _tupleType;
400 if (_tupleType == 0xff) {
401 dprintk("END OF CHAIN TUPLE type:0x%x\n", _tupleType);
402 *address += 2;
403 *tupleType = _tupleType;
404 *tupleLength = 0;
405 return 0;
406 }
407 if ((_tupleLength = ca->pub->read_attribute_mem(ca->pub, slot, _address + 2)) < 0)
408 return _tupleLength;
409 _address += 4;
410
411 dprintk("TUPLE type:0x%x length:%i\n", _tupleType, _tupleLength);
412
413 /* read in the whole tuple */
414 for (i = 0; i < _tupleLength; i++) {
415 tuple[i] = ca->pub->read_attribute_mem(ca->pub, slot, _address + (i * 2));
416 dprintk(" 0x%02x: 0x%02x %c\n",
417 i, tuple[i] & 0xff,
418 ((tuple[i] > 31) && (tuple[i] < 127)) ? tuple[i] : '.');
419 }
420 _address += (_tupleLength * 2);
421
422 // success
423 *tupleType = _tupleType;
424 *tupleLength = _tupleLength;
425 *address = _address;
426 return 0;
427 }
428
429
430 /**
431 * dvb_ca_en50221_parse_attributes - Parse attribute memory of a CAM module,
432 * extracting Config register, and checking it is a DVB CAM module.
433 *
434 * @ca: CA instance.
435 * @slot: Slot id.
436 *
437 * @return 0 on success, <0 on failure.
438 */
439 static int dvb_ca_en50221_parse_attributes(struct dvb_ca_private *ca, int slot)
440 {
441 int address = 0;
442 int tupleLength;
443 int tupleType;
444 u8 tuple[257];
445 char *dvb_str;
446 int rasz;
447 int status;
448 int got_cftableentry = 0;
449 int end_chain = 0;
450 int i;
451 u16 manfid = 0;
452 u16 devid = 0;
453
454
455 // CISTPL_DEVICE_0A
456 if ((status =
457 dvb_ca_en50221_read_tuple(ca, slot, &address, &tupleType, &tupleLength, tuple)) < 0)
458 return status;
459 if (tupleType != 0x1D)
460 return -EINVAL;
461
462
463
464 // CISTPL_DEVICE_0C
465 if ((status =
466 dvb_ca_en50221_read_tuple(ca, slot, &address, &tupleType, &tupleLength, tuple)) < 0)
467 return status;
468 if (tupleType != 0x1C)
469 return -EINVAL;
470
471
472
473 // CISTPL_VERS_1
474 if ((status =
475 dvb_ca_en50221_read_tuple(ca, slot, &address, &tupleType, &tupleLength, tuple)) < 0)
476 return status;
477 if (tupleType != 0x15)
478 return -EINVAL;
479
480
481
482 // CISTPL_MANFID
483 if ((status = dvb_ca_en50221_read_tuple(ca, slot, &address, &tupleType,
484 &tupleLength, tuple)) < 0)
485 return status;
486 if (tupleType != 0x20)
487 return -EINVAL;
488 if (tupleLength != 4)
489 return -EINVAL;
490 manfid = (tuple[1] << 8) | tuple[0];
491 devid = (tuple[3] << 8) | tuple[2];
492
493
494
495 // CISTPL_CONFIG
496 if ((status = dvb_ca_en50221_read_tuple(ca, slot, &address, &tupleType,
497 &tupleLength, tuple)) < 0)
498 return status;
499 if (tupleType != 0x1A)
500 return -EINVAL;
501 if (tupleLength < 3)
502 return -EINVAL;
503
504 /* extract the configbase */
505 rasz = tuple[0] & 3;
506 if (tupleLength < (3 + rasz + 14))
507 return -EINVAL;
508 ca->slot_info[slot].config_base = 0;
509 for (i = 0; i < rasz + 1; i++) {
510 ca->slot_info[slot].config_base |= (tuple[2 + i] << (8 * i));
511 }
512
513 /* check it contains the correct DVB string */
514 dvb_str = findstr((char *)tuple, tupleLength, "DVB_CI_V", 8);
515 if (dvb_str == NULL)
516 return -EINVAL;
517 if (tupleLength < ((dvb_str - (char *) tuple) + 12))
518 return -EINVAL;
519
520 /* is it a version we support? */
521 if (strncmp(dvb_str + 8, "1.00", 4)) {
522 printk("dvb_ca adapter %d: Unsupported DVB CAM module version %c%c%c%c\n",
523 ca->dvbdev->adapter->num, dvb_str[8], dvb_str[9], dvb_str[10], dvb_str[11]);
524 return -EINVAL;
525 }
526
527 /* process the CFTABLE_ENTRY tuples, and any after those */
528 while ((!end_chain) && (address < 0x1000)) {
529 if ((status = dvb_ca_en50221_read_tuple(ca, slot, &address, &tupleType,
530 &tupleLength, tuple)) < 0)
531 return status;
532 switch (tupleType) {
533 case 0x1B: // CISTPL_CFTABLE_ENTRY
534 if (tupleLength < (2 + 11 + 17))
535 break;
536
537 /* if we've already parsed one, just use it */
538 if (got_cftableentry)
539 break;
540
541 /* get the config option */
542 ca->slot_info[slot].config_option = tuple[0] & 0x3f;
543
544 /* OK, check it contains the correct strings */
545 if ((findstr((char *)tuple, tupleLength, "DVB_HOST", 8) == NULL) ||
546 (findstr((char *)tuple, tupleLength, "DVB_CI_MODULE", 13) == NULL))
547 break;
548
549 got_cftableentry = 1;
550 break;
551
552 case 0x14: // CISTPL_NO_LINK
553 break;
554
555 case 0xFF: // CISTPL_END
556 end_chain = 1;
557 break;
558
559 default: /* Unknown tuple type - just skip this tuple and move to the next one */
560 dprintk("dvb_ca: Skipping unknown tuple type:0x%x length:0x%x\n", tupleType,
561 tupleLength);
562 break;
563 }
564 }
565
566 if ((address > 0x1000) || (!got_cftableentry))
567 return -EINVAL;
568
569 dprintk("Valid DVB CAM detected MANID:%x DEVID:%x CONFIGBASE:0x%x CONFIGOPTION:0x%x\n",
570 manfid, devid, ca->slot_info[slot].config_base, ca->slot_info[slot].config_option);
571
572 // success!
573 return 0;
574 }
575
576
577 /**
578 * dvb_ca_en50221_set_configoption - Set CAM's configoption correctly.
579 *
580 * @ca: CA instance.
581 * @slot: Slot containing the CAM.
582 */
583 static int dvb_ca_en50221_set_configoption(struct dvb_ca_private *ca, int slot)
584 {
585 int configoption;
586
587 dprintk("%s\n", __func__);
588
589 /* set the config option */
590 ca->pub->write_attribute_mem(ca->pub, slot,
591 ca->slot_info[slot].config_base,
592 ca->slot_info[slot].config_option);
593
594 /* check it */
595 configoption = ca->pub->read_attribute_mem(ca->pub, slot, ca->slot_info[slot].config_base);
596 dprintk("Set configoption 0x%x, read configoption 0x%x\n",
597 ca->slot_info[slot].config_option, configoption & 0x3f);
598
599 /* fine! */
600 return 0;
601
602 }
603
604
605 /**
606 * dvb_ca_en50221_read_data - This function talks to an EN50221 CAM control
607 * interface. It reads a buffer of data from the CAM. The data can either
608 * be stored in a supplied buffer, or automatically be added to the slot's
609 * rx_buffer.
610 *
611 * @ca: CA instance.
612 * @slot: Slot to read from.
613 * @ebuf: If non-NULL, the data will be written to this buffer. If NULL,
614 * the data will be added into the buffering system as a normal fragment.
615 * @ecount: Size of ebuf. Ignored if ebuf is NULL.
616 *
617 * @return Number of bytes read, or < 0 on error
618 */
619 static int dvb_ca_en50221_read_data(struct dvb_ca_private *ca, int slot, u8 * ebuf, int ecount)
620 {
621 int bytes_read;
622 int status;
623 u8 buf[HOST_LINK_BUF_SIZE];
624 int i;
625
626 dprintk("%s\n", __func__);
627
628 /* check if we have space for a link buf in the rx_buffer */
629 if (ebuf == NULL) {
630 int buf_free;
631
632 if (ca->slot_info[slot].rx_buffer.data == NULL) {
633 status = -EIO;
634 goto exit;
635 }
636 buf_free = dvb_ringbuffer_free(&ca->slot_info[slot].rx_buffer);
637
638 if (buf_free < (ca->slot_info[slot].link_buf_size + DVB_RINGBUFFER_PKTHDRSIZE)) {
639 status = -EAGAIN;
640 goto exit;
641 }
642 }
643
644 /* check if there is data available */
645 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS)) < 0)
646 goto exit;
647 if (!(status & STATUSREG_DA)) {
648 /* no data */
649 status = 0;
650 goto exit;
651 }
652
653 /* read the amount of data */
654 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_SIZE_HIGH)) < 0)
655 goto exit;
656 bytes_read = status << 8;
657 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_SIZE_LOW)) < 0)
658 goto exit;
659 bytes_read |= status;
660
661 /* check it will fit */
662 if (ebuf == NULL) {
663 if (bytes_read > ca->slot_info[slot].link_buf_size) {
664 printk("dvb_ca adapter %d: CAM tried to send a buffer larger than the link buffer size (%i > %i)!\n",
665 ca->dvbdev->adapter->num, bytes_read, ca->slot_info[slot].link_buf_size);
666 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_LINKINIT;
667 status = -EIO;
668 goto exit;
669 }
670 if (bytes_read < 2) {
671 printk("dvb_ca adapter %d: CAM sent a buffer that was less than 2 bytes!\n",
672 ca->dvbdev->adapter->num);
673 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_LINKINIT;
674 status = -EIO;
675 goto exit;
676 }
677 } else {
678 if (bytes_read > ecount) {
679 printk("dvb_ca adapter %d: CAM tried to send a buffer larger than the ecount size!\n",
680 ca->dvbdev->adapter->num);
681 status = -EIO;
682 goto exit;
683 }
684 }
685
686 /* fill the buffer */
687 for (i = 0; i < bytes_read; i++) {
688 /* read byte and check */
689 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_DATA)) < 0)
690 goto exit;
691
692 /* OK, store it in the buffer */
693 buf[i] = status;
694 }
695
696 /* check for read error (RE should now be 0) */
697 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS)) < 0)
698 goto exit;
699 if (status & STATUSREG_RE) {
700 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_LINKINIT;
701 status = -EIO;
702 goto exit;
703 }
704
705 /* OK, add it to the receive buffer, or copy into external buffer if supplied */
706 if (ebuf == NULL) {
707 if (ca->slot_info[slot].rx_buffer.data == NULL) {
708 status = -EIO;
709 goto exit;
710 }
711 dvb_ringbuffer_pkt_write(&ca->slot_info[slot].rx_buffer, buf, bytes_read);
712 } else {
713 memcpy(ebuf, buf, bytes_read);
714 }
715
716 dprintk("Received CA packet for slot %i connection id 0x%x last_frag:%i size:0x%x\n", slot,
717 buf[0], (buf[1] & 0x80) == 0, bytes_read);
718
719 /* wake up readers when a last_fragment is received */
720 if ((buf[1] & 0x80) == 0x00) {
721 wake_up_interruptible(&ca->wait_queue);
722 }
723 status = bytes_read;
724
725 exit:
726 return status;
727 }
728
729
730 /**
731 * dvb_ca_en50221_write_data - This function talks to an EN50221 CAM control
732 * interface. It writes a buffer of data to a CAM.
733 *
734 * @ca: CA instance.
735 * @slot: Slot to write to.
736 * @ebuf: The data in this buffer is treated as a complete link-level packet to
737 * be written.
738 * @count: Size of ebuf.
739 *
740 * @return Number of bytes written, or < 0 on error.
741 */
742 static int dvb_ca_en50221_write_data(struct dvb_ca_private *ca, int slot, u8 * buf, int bytes_write)
743 {
744 int status;
745 int i;
746
747 dprintk("%s\n", __func__);
748
749
750 /* sanity check */
751 if (bytes_write > ca->slot_info[slot].link_buf_size)
752 return -EINVAL;
753
754 /* it is possible we are dealing with a single buffer implementation,
755 thus if there is data available for read or if there is even a read
756 already in progress, we do nothing but awake the kernel thread to
757 process the data if necessary. */
758 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS)) < 0)
759 goto exitnowrite;
760 if (status & (STATUSREG_DA | STATUSREG_RE)) {
761 if (status & STATUSREG_DA)
762 dvb_ca_en50221_thread_wakeup(ca);
763
764 status = -EAGAIN;
765 goto exitnowrite;
766 }
767
768 /* OK, set HC bit */
769 if ((status = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND,
770 IRQEN | CMDREG_HC)) != 0)
771 goto exit;
772
773 /* check if interface is still free */
774 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS)) < 0)
775 goto exit;
776 if (!(status & STATUSREG_FR)) {
777 /* it wasn't free => try again later */
778 status = -EAGAIN;
779 goto exit;
780 }
781
782 /* send the amount of data */
783 if ((status = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_SIZE_HIGH, bytes_write >> 8)) != 0)
784 goto exit;
785 if ((status = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_SIZE_LOW,
786 bytes_write & 0xff)) != 0)
787 goto exit;
788
789 /* send the buffer */
790 for (i = 0; i < bytes_write; i++) {
791 if ((status = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_DATA, buf[i])) != 0)
792 goto exit;
793 }
794
795 /* check for write error (WE should now be 0) */
796 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS)) < 0)
797 goto exit;
798 if (status & STATUSREG_WE) {
799 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_LINKINIT;
800 status = -EIO;
801 goto exit;
802 }
803 status = bytes_write;
804
805 dprintk("Wrote CA packet for slot %i, connection id 0x%x last_frag:%i size:0x%x\n", slot,
806 buf[0], (buf[1] & 0x80) == 0, bytes_write);
807
808 exit:
809 ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, IRQEN);
810
811 exitnowrite:
812 return status;
813 }
814 EXPORT_SYMBOL(dvb_ca_en50221_camchange_irq);
815
816
817
818 /* ******************************************************************************** */
819 /* EN50221 higher level functions */
820
821
822 /**
823 * dvb_ca_en50221_camready_irq - A CAM has been removed => shut it down.
824 *
825 * @ca: CA instance.
826 * @slot: Slot to shut down.
827 */
828 static int dvb_ca_en50221_slot_shutdown(struct dvb_ca_private *ca, int slot)
829 {
830 dprintk("%s\n", __func__);
831
832 ca->pub->slot_shutdown(ca->pub, slot);
833 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_NONE;
834
835 /* need to wake up all processes to check if they're now
836 trying to write to a defunct CAM */
837 wake_up_interruptible(&ca->wait_queue);
838
839 dprintk("Slot %i shutdown\n", slot);
840
841 /* success */
842 return 0;
843 }
844 EXPORT_SYMBOL(dvb_ca_en50221_camready_irq);
845
846
847 /**
848 * dvb_ca_en50221_camready_irq - A CAMCHANGE IRQ has occurred.
849 *
850 * @ca: CA instance.
851 * @slot: Slot concerned.
852 * @change_type: One of the DVB_CA_CAMCHANGE_* values.
853 */
854 void dvb_ca_en50221_camchange_irq(struct dvb_ca_en50221 *pubca, int slot, int change_type)
855 {
856 struct dvb_ca_private *ca = pubca->private;
857
858 dprintk("CAMCHANGE IRQ slot:%i change_type:%i\n", slot, change_type);
859
860 switch (change_type) {
861 case DVB_CA_EN50221_CAMCHANGE_REMOVED:
862 case DVB_CA_EN50221_CAMCHANGE_INSERTED:
863 break;
864
865 default:
866 return;
867 }
868
869 ca->slot_info[slot].camchange_type = change_type;
870 atomic_inc(&ca->slot_info[slot].camchange_count);
871 dvb_ca_en50221_thread_wakeup(ca);
872 }
873 EXPORT_SYMBOL(dvb_ca_en50221_frda_irq);
874
875
876 /**
877 * dvb_ca_en50221_camready_irq - A CAMREADY IRQ has occurred.
878 *
879 * @ca: CA instance.
880 * @slot: Slot concerned.
881 */
882 void dvb_ca_en50221_camready_irq(struct dvb_ca_en50221 *pubca, int slot)
883 {
884 struct dvb_ca_private *ca = pubca->private;
885
886 dprintk("CAMREADY IRQ slot:%i\n", slot);
887
888 if (ca->slot_info[slot].slot_state == DVB_CA_SLOTSTATE_WAITREADY) {
889 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_VALIDATE;
890 dvb_ca_en50221_thread_wakeup(ca);
891 }
892 }
893
894
895 /**
896 * An FR or DA IRQ has occurred.
897 *
898 * @ca: CA instance.
899 * @slot: Slot concerned.
900 */
901 void dvb_ca_en50221_frda_irq(struct dvb_ca_en50221 *pubca, int slot)
902 {
903 struct dvb_ca_private *ca = pubca->private;
904 int flags;
905
906 dprintk("FR/DA IRQ slot:%i\n", slot);
907
908 switch (ca->slot_info[slot].slot_state) {
909 case DVB_CA_SLOTSTATE_LINKINIT:
910 flags = ca->pub->read_cam_control(pubca, slot, CTRLIF_STATUS);
911 if (flags & STATUSREG_DA) {
912 dprintk("CAM supports DA IRQ\n");
913 ca->slot_info[slot].da_irq_supported = 1;
914 }
915 break;
916
917 case DVB_CA_SLOTSTATE_RUNNING:
918 if (ca->open)
919 dvb_ca_en50221_thread_wakeup(ca);
920 break;
921 }
922 }
923
924
925
926 /* ******************************************************************************** */
927 /* EN50221 thread functions */
928
929 /**
930 * Wake up the DVB CA thread
931 *
932 * @ca: CA instance.
933 */
934 static void dvb_ca_en50221_thread_wakeup(struct dvb_ca_private *ca)
935 {
936
937 dprintk("%s\n", __func__);
938
939 ca->wakeup = 1;
940 mb();
941 wake_up_process(ca->thread);
942 }
943
944 /**
945 * Update the delay used by the thread.
946 *
947 * @ca: CA instance.
948 */
949 static void dvb_ca_en50221_thread_update_delay(struct dvb_ca_private *ca)
950 {
951 int delay;
952 int curdelay = 100000000;
953 int slot;
954
955 /* Beware of too high polling frequency, because one polling
956 * call might take several hundred milliseconds until timeout!
957 */
958 for (slot = 0; slot < ca->slot_count; slot++) {
959 switch (ca->slot_info[slot].slot_state) {
960 default:
961 case DVB_CA_SLOTSTATE_NONE:
962 delay = HZ * 60; /* 60s */
963 if (!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE))
964 delay = HZ * 5; /* 5s */
965 break;
966 case DVB_CA_SLOTSTATE_INVALID:
967 delay = HZ * 60; /* 60s */
968 if (!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE))
969 delay = HZ / 10; /* 100ms */
970 break;
971
972 case DVB_CA_SLOTSTATE_UNINITIALISED:
973 case DVB_CA_SLOTSTATE_WAITREADY:
974 case DVB_CA_SLOTSTATE_VALIDATE:
975 case DVB_CA_SLOTSTATE_WAITFR:
976 case DVB_CA_SLOTSTATE_LINKINIT:
977 delay = HZ / 10; /* 100ms */
978 break;
979
980 case DVB_CA_SLOTSTATE_RUNNING:
981 delay = HZ * 60; /* 60s */
982 if (!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE))
983 delay = HZ / 10; /* 100ms */
984 if (ca->open) {
985 if ((!ca->slot_info[slot].da_irq_supported) ||
986 (!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_DA)))
987 delay = HZ / 10; /* 100ms */
988 }
989 break;
990 }
991
992 if (delay < curdelay)
993 curdelay = delay;
994 }
995
996 ca->delay = curdelay;
997 }
998
999
1000
1001 /**
1002 * Kernel thread which monitors CA slots for CAM changes, and performs data transfers.
1003 */
1004 static int dvb_ca_en50221_thread(void *data)
1005 {
1006 struct dvb_ca_private *ca = data;
1007 int slot;
1008 int flags;
1009 int status;
1010 int pktcount;
1011 void *rxbuf;
1012
1013 dprintk("%s\n", __func__);
1014
1015 /* choose the correct initial delay */
1016 dvb_ca_en50221_thread_update_delay(ca);
1017
1018 /* main loop */
1019 while (!kthread_should_stop()) {
1020 /* sleep for a bit */
1021 if (!ca->wakeup) {
1022 set_current_state(TASK_INTERRUPTIBLE);
1023 schedule_timeout(ca->delay);
1024 if (kthread_should_stop())
1025 return 0;
1026 }
1027 ca->wakeup = 0;
1028
1029 /* go through all the slots processing them */
1030 for (slot = 0; slot < ca->slot_count; slot++) {
1031
1032 mutex_lock(&ca->slot_info[slot].slot_lock);
1033
1034 // check the cam status + deal with CAMCHANGEs
1035 while (dvb_ca_en50221_check_camstatus(ca, slot)) {
1036 /* clear down an old CI slot if necessary */
1037 if (ca->slot_info[slot].slot_state != DVB_CA_SLOTSTATE_NONE)
1038 dvb_ca_en50221_slot_shutdown(ca, slot);
1039
1040 /* if a CAM is NOW present, initialise it */
1041 if (ca->slot_info[slot].camchange_type == DVB_CA_EN50221_CAMCHANGE_INSERTED) {
1042 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_UNINITIALISED;
1043 }
1044
1045 /* we've handled one CAMCHANGE */
1046 dvb_ca_en50221_thread_update_delay(ca);
1047 atomic_dec(&ca->slot_info[slot].camchange_count);
1048 }
1049
1050 // CAM state machine
1051 switch (ca->slot_info[slot].slot_state) {
1052 case DVB_CA_SLOTSTATE_NONE:
1053 case DVB_CA_SLOTSTATE_INVALID:
1054 // no action needed
1055 break;
1056
1057 case DVB_CA_SLOTSTATE_UNINITIALISED:
1058 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_WAITREADY;
1059 ca->pub->slot_reset(ca->pub, slot);
1060 ca->slot_info[slot].timeout = jiffies + (INIT_TIMEOUT_SECS * HZ);
1061 break;
1062
1063 case DVB_CA_SLOTSTATE_WAITREADY:
1064 if (time_after(jiffies, ca->slot_info[slot].timeout)) {
1065 printk("dvb_ca adaptor %d: PC card did not respond :(\n",
1066 ca->dvbdev->adapter->num);
1067 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID;
1068 dvb_ca_en50221_thread_update_delay(ca);
1069 break;
1070 }
1071 // no other action needed; will automatically change state when ready
1072 break;
1073
1074 case DVB_CA_SLOTSTATE_VALIDATE:
1075 if (dvb_ca_en50221_parse_attributes(ca, slot) != 0) {
1076 /* we need this extra check for annoying interfaces like the budget-av */
1077 if ((!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE)) &&
1078 (ca->pub->poll_slot_status)) {
1079 status = ca->pub->poll_slot_status(ca->pub, slot, 0);
1080 if (!(status & DVB_CA_EN50221_POLL_CAM_PRESENT)) {
1081 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_NONE;
1082 dvb_ca_en50221_thread_update_delay(ca);
1083 break;
1084 }
1085 }
1086
1087 printk("dvb_ca adapter %d: Invalid PC card inserted :(\n",
1088 ca->dvbdev->adapter->num);
1089 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID;
1090 dvb_ca_en50221_thread_update_delay(ca);
1091 break;
1092 }
1093 if (dvb_ca_en50221_set_configoption(ca, slot) != 0) {
1094 printk("dvb_ca adapter %d: Unable to initialise CAM :(\n",
1095 ca->dvbdev->adapter->num);
1096 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID;
1097 dvb_ca_en50221_thread_update_delay(ca);
1098 break;
1099 }
1100 if (ca->pub->write_cam_control(ca->pub, slot,
1101 CTRLIF_COMMAND, CMDREG_RS) != 0) {
1102 printk("dvb_ca adapter %d: Unable to reset CAM IF\n",
1103 ca->dvbdev->adapter->num);
1104 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID;
1105 dvb_ca_en50221_thread_update_delay(ca);
1106 break;
1107 }
1108 dprintk("DVB CAM validated successfully\n");
1109
1110 ca->slot_info[slot].timeout = jiffies + (INIT_TIMEOUT_SECS * HZ);
1111 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_WAITFR;
1112 ca->wakeup = 1;
1113 break;
1114
1115 case DVB_CA_SLOTSTATE_WAITFR:
1116 if (time_after(jiffies, ca->slot_info[slot].timeout)) {
1117 printk("dvb_ca adapter %d: DVB CAM did not respond :(\n",
1118 ca->dvbdev->adapter->num);
1119 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID;
1120 dvb_ca_en50221_thread_update_delay(ca);
1121 break;
1122 }
1123
1124 flags = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS);
1125 if (flags & STATUSREG_FR) {
1126 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_LINKINIT;
1127 ca->wakeup = 1;
1128 }
1129 break;
1130
1131 case DVB_CA_SLOTSTATE_LINKINIT:
1132 if (dvb_ca_en50221_link_init(ca, slot) != 0) {
1133 /* we need this extra check for annoying interfaces like the budget-av */
1134 if ((!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE)) &&
1135 (ca->pub->poll_slot_status)) {
1136 status = ca->pub->poll_slot_status(ca->pub, slot, 0);
1137 if (!(status & DVB_CA_EN50221_POLL_CAM_PRESENT)) {
1138 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_NONE;
1139 dvb_ca_en50221_thread_update_delay(ca);
1140 break;
1141 }
1142 }
1143
1144 printk("dvb_ca adapter %d: DVB CAM link initialisation failed :(\n", ca->dvbdev->adapter->num);
1145 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID;
1146 dvb_ca_en50221_thread_update_delay(ca);
1147 break;
1148 }
1149
1150 if (ca->slot_info[slot].rx_buffer.data == NULL) {
1151 rxbuf = vmalloc(RX_BUFFER_SIZE);
1152 if (rxbuf == NULL) {
1153 printk("dvb_ca adapter %d: Unable to allocate CAM rx buffer :(\n", ca->dvbdev->adapter->num);
1154 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID;
1155 dvb_ca_en50221_thread_update_delay(ca);
1156 break;
1157 }
1158 dvb_ringbuffer_init(&ca->slot_info[slot].rx_buffer, rxbuf, RX_BUFFER_SIZE);
1159 }
1160
1161 ca->pub->slot_ts_enable(ca->pub, slot);
1162 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_RUNNING;
1163 dvb_ca_en50221_thread_update_delay(ca);
1164 printk("dvb_ca adapter %d: DVB CAM detected and initialised successfully\n", ca->dvbdev->adapter->num);
1165 break;
1166
1167 case DVB_CA_SLOTSTATE_RUNNING:
1168 if (!ca->open)
1169 break;
1170
1171 // poll slots for data
1172 pktcount = 0;
1173 while ((status = dvb_ca_en50221_read_data(ca, slot, NULL, 0)) > 0) {
1174 if (!ca->open)
1175 break;
1176
1177 /* if a CAMCHANGE occurred at some point, do not do any more processing of this slot */
1178 if (dvb_ca_en50221_check_camstatus(ca, slot)) {
1179 // we dont want to sleep on the next iteration so we can handle the cam change
1180 ca->wakeup = 1;
1181 break;
1182 }
1183
1184 /* check if we've hit our limit this time */
1185 if (++pktcount >= MAX_RX_PACKETS_PER_ITERATION) {
1186 // dont sleep; there is likely to be more data to read
1187 ca->wakeup = 1;
1188 break;
1189 }
1190 }
1191 break;
1192 }
1193
1194 mutex_unlock(&ca->slot_info[slot].slot_lock);
1195 }
1196 }
1197
1198 return 0;
1199 }
1200
1201
1202
1203 /* ******************************************************************************** */
1204 /* EN50221 IO interface functions */
1205
1206 /**
1207 * Real ioctl implementation.
1208 * NOTE: CA_SEND_MSG/CA_GET_MSG ioctls have userspace buffers passed to them.
1209 *
1210 * @inode: Inode concerned.
1211 * @file: File concerned.
1212 * @cmd: IOCTL command.
1213 * @arg: Associated argument.
1214 *
1215 * @return 0 on success, <0 on error.
1216 */
1217 static int dvb_ca_en50221_io_do_ioctl(struct file *file,
1218 unsigned int cmd, void *parg)
1219 {
1220 struct dvb_device *dvbdev = file->private_data;
1221 struct dvb_ca_private *ca = dvbdev->priv;
1222 int err = 0;
1223 int slot;
1224
1225 dprintk("%s\n", __func__);
1226
1227 if (mutex_lock_interruptible(&ca->ioctl_mutex))
1228 return -ERESTARTSYS;
1229
1230 switch (cmd) {
1231 case CA_RESET:
1232 for (slot = 0; slot < ca->slot_count; slot++) {
1233 mutex_lock(&ca->slot_info[slot].slot_lock);
1234 if (ca->slot_info[slot].slot_state != DVB_CA_SLOTSTATE_NONE) {
1235 dvb_ca_en50221_slot_shutdown(ca, slot);
1236 if (ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE)
1237 dvb_ca_en50221_camchange_irq(ca->pub,
1238 slot,
1239 DVB_CA_EN50221_CAMCHANGE_INSERTED);
1240 }
1241 mutex_unlock(&ca->slot_info[slot].slot_lock);
1242 }
1243 ca->next_read_slot = 0;
1244 dvb_ca_en50221_thread_wakeup(ca);
1245 break;
1246
1247 case CA_GET_CAP: {
1248 struct ca_caps *caps = parg;
1249
1250 caps->slot_num = ca->slot_count;
1251 caps->slot_type = CA_CI_LINK;
1252 caps->descr_num = 0;
1253 caps->descr_type = 0;
1254 break;
1255 }
1256
1257 case CA_GET_SLOT_INFO: {
1258 struct ca_slot_info *info = parg;
1259
1260 if ((info->num > ca->slot_count) || (info->num < 0)) {
1261 err = -EINVAL;
1262 goto out_unlock;
1263 }
1264
1265 info->type = CA_CI_LINK;
1266 info->flags = 0;
1267 if ((ca->slot_info[info->num].slot_state != DVB_CA_SLOTSTATE_NONE)
1268 && (ca->slot_info[info->num].slot_state != DVB_CA_SLOTSTATE_INVALID)) {
1269 info->flags = CA_CI_MODULE_PRESENT;
1270 }
1271 if (ca->slot_info[info->num].slot_state == DVB_CA_SLOTSTATE_RUNNING) {
1272 info->flags |= CA_CI_MODULE_READY;
1273 }
1274 break;
1275 }
1276
1277 default:
1278 err = -EINVAL;
1279 break;
1280 }
1281
1282 out_unlock:
1283 mutex_unlock(&ca->ioctl_mutex);
1284 return err;
1285 }
1286
1287
1288 /**
1289 * Wrapper for ioctl implementation.
1290 *
1291 * @inode: Inode concerned.
1292 * @file: File concerned.
1293 * @cmd: IOCTL command.
1294 * @arg: Associated argument.
1295 *
1296 * @return 0 on success, <0 on error.
1297 */
1298 static long dvb_ca_en50221_io_ioctl(struct file *file,
1299 unsigned int cmd, unsigned long arg)
1300 {
1301 return dvb_usercopy(file, cmd, arg, dvb_ca_en50221_io_do_ioctl);
1302 }
1303
1304
1305 /**
1306 * Implementation of write() syscall.
1307 *
1308 * @file: File structure.
1309 * @buf: Source buffer.
1310 * @count: Size of source buffer.
1311 * @ppos: Position in file (ignored).
1312 *
1313 * @return Number of bytes read, or <0 on error.
1314 */
1315 static ssize_t dvb_ca_en50221_io_write(struct file *file,
1316 const char __user * buf, size_t count, loff_t * ppos)
1317 {
1318 struct dvb_device *dvbdev = file->private_data;
1319 struct dvb_ca_private *ca = dvbdev->priv;
1320 u8 slot, connection_id;
1321 int status;
1322 u8 fragbuf[HOST_LINK_BUF_SIZE];
1323 int fragpos = 0;
1324 int fraglen;
1325 unsigned long timeout;
1326 int written;
1327
1328 dprintk("%s\n", __func__);
1329
1330 /* Incoming packet has a 2 byte header. hdr[0] = slot_id, hdr[1] = connection_id */
1331 if (count < 2)
1332 return -EINVAL;
1333
1334 /* extract slot & connection id */
1335 if (copy_from_user(&slot, buf, 1))
1336 return -EFAULT;
1337 if (copy_from_user(&connection_id, buf + 1, 1))
1338 return -EFAULT;
1339 buf += 2;
1340 count -= 2;
1341
1342 /* check if the slot is actually running */
1343 if (ca->slot_info[slot].slot_state != DVB_CA_SLOTSTATE_RUNNING)
1344 return -EINVAL;
1345
1346 /* fragment the packets & store in the buffer */
1347 while (fragpos < count) {
1348 fraglen = ca->slot_info[slot].link_buf_size - 2;
1349 if (fraglen < 0)
1350 break;
1351 if (fraglen > HOST_LINK_BUF_SIZE - 2)
1352 fraglen = HOST_LINK_BUF_SIZE - 2;
1353 if ((count - fragpos) < fraglen)
1354 fraglen = count - fragpos;
1355
1356 fragbuf[0] = connection_id;
1357 fragbuf[1] = ((fragpos + fraglen) < count) ? 0x80 : 0x00;
1358 status = copy_from_user(fragbuf + 2, buf + fragpos, fraglen);
1359 if (status) {
1360 status = -EFAULT;
1361 goto exit;
1362 }
1363
1364 timeout = jiffies + HZ / 2;
1365 written = 0;
1366 while (!time_after(jiffies, timeout)) {
1367 /* check the CAM hasn't been removed/reset in the meantime */
1368 if (ca->slot_info[slot].slot_state != DVB_CA_SLOTSTATE_RUNNING) {
1369 status = -EIO;
1370 goto exit;
1371 }
1372
1373 mutex_lock(&ca->slot_info[slot].slot_lock);
1374 status = dvb_ca_en50221_write_data(ca, slot, fragbuf, fraglen + 2);
1375 mutex_unlock(&ca->slot_info[slot].slot_lock);
1376 if (status == (fraglen + 2)) {
1377 written = 1;
1378 break;
1379 }
1380 if (status != -EAGAIN)
1381 goto exit;
1382
1383 msleep(1);
1384 }
1385 if (!written) {
1386 status = -EIO;
1387 goto exit;
1388 }
1389
1390 fragpos += fraglen;
1391 }
1392 status = count + 2;
1393
1394 exit:
1395 return status;
1396 }
1397
1398
1399 /**
1400 * Condition for waking up in dvb_ca_en50221_io_read_condition
1401 */
1402 static int dvb_ca_en50221_io_read_condition(struct dvb_ca_private *ca,
1403 int *result, int *_slot)
1404 {
1405 int slot;
1406 int slot_count = 0;
1407 int idx;
1408 size_t fraglen;
1409 int connection_id = -1;
1410 int found = 0;
1411 u8 hdr[2];
1412
1413 slot = ca->next_read_slot;
1414 while ((slot_count < ca->slot_count) && (!found)) {
1415 if (ca->slot_info[slot].slot_state != DVB_CA_SLOTSTATE_RUNNING)
1416 goto nextslot;
1417
1418 if (ca->slot_info[slot].rx_buffer.data == NULL) {
1419 return 0;
1420 }
1421
1422 idx = dvb_ringbuffer_pkt_next(&ca->slot_info[slot].rx_buffer, -1, &fraglen);
1423 while (idx != -1) {
1424 dvb_ringbuffer_pkt_read(&ca->slot_info[slot].rx_buffer, idx, 0, hdr, 2);
1425 if (connection_id == -1)
1426 connection_id = hdr[0];
1427 if ((hdr[0] == connection_id) && ((hdr[1] & 0x80) == 0)) {
1428 *_slot = slot;
1429 found = 1;
1430 break;
1431 }
1432
1433 idx = dvb_ringbuffer_pkt_next(&ca->slot_info[slot].rx_buffer, idx, &fraglen);
1434 }
1435
1436 nextslot:
1437 slot = (slot + 1) % ca->slot_count;
1438 slot_count++;
1439 }
1440
1441 ca->next_read_slot = slot;
1442 return found;
1443 }
1444
1445
1446 /**
1447 * Implementation of read() syscall.
1448 *
1449 * @file: File structure.
1450 * @buf: Destination buffer.
1451 * @count: Size of destination buffer.
1452 * @ppos: Position in file (ignored).
1453 *
1454 * @return Number of bytes read, or <0 on error.
1455 */
1456 static ssize_t dvb_ca_en50221_io_read(struct file *file, char __user * buf,
1457 size_t count, loff_t * ppos)
1458 {
1459 struct dvb_device *dvbdev = file->private_data;
1460 struct dvb_ca_private *ca = dvbdev->priv;
1461 int status;
1462 int result = 0;
1463 u8 hdr[2];
1464 int slot;
1465 int connection_id = -1;
1466 size_t idx, idx2;
1467 int last_fragment = 0;
1468 size_t fraglen;
1469 int pktlen;
1470 int dispose = 0;
1471
1472 dprintk("%s\n", __func__);
1473
1474 /* Outgoing packet has a 2 byte header. hdr[0] = slot_id, hdr[1] = connection_id */
1475 if (count < 2)
1476 return -EINVAL;
1477
1478 /* wait for some data */
1479 if ((status = dvb_ca_en50221_io_read_condition(ca, &result, &slot)) == 0) {
1480
1481 /* if we're in nonblocking mode, exit immediately */
1482 if (file->f_flags & O_NONBLOCK)
1483 return -EWOULDBLOCK;
1484
1485 /* wait for some data */
1486 status = wait_event_interruptible(ca->wait_queue,
1487 dvb_ca_en50221_io_read_condition
1488 (ca, &result, &slot));
1489 }
1490 if ((status < 0) || (result < 0)) {
1491 if (result)
1492 return result;
1493 return status;
1494 }
1495
1496 idx = dvb_ringbuffer_pkt_next(&ca->slot_info[slot].rx_buffer, -1, &fraglen);
1497 pktlen = 2;
1498 do {
1499 if (idx == -1) {
1500 printk("dvb_ca adapter %d: BUG: read packet ended before last_fragment encountered\n", ca->dvbdev->adapter->num);
1501 status = -EIO;
1502 goto exit;
1503 }
1504
1505 dvb_ringbuffer_pkt_read(&ca->slot_info[slot].rx_buffer, idx, 0, hdr, 2);
1506 if (connection_id == -1)
1507 connection_id = hdr[0];
1508 if (hdr[0] == connection_id) {
1509 if (pktlen < count) {
1510 if ((pktlen + fraglen - 2) > count) {
1511 fraglen = count - pktlen;
1512 } else {
1513 fraglen -= 2;
1514 }
1515
1516 if ((status = dvb_ringbuffer_pkt_read_user(&ca->slot_info[slot].rx_buffer, idx, 2,
1517 buf + pktlen, fraglen)) < 0) {
1518 goto exit;
1519 }
1520 pktlen += fraglen;
1521 }
1522
1523 if ((hdr[1] & 0x80) == 0)
1524 last_fragment = 1;
1525 dispose = 1;
1526 }
1527
1528 idx2 = dvb_ringbuffer_pkt_next(&ca->slot_info[slot].rx_buffer, idx, &fraglen);
1529 if (dispose)
1530 dvb_ringbuffer_pkt_dispose(&ca->slot_info[slot].rx_buffer, idx);
1531 idx = idx2;
1532 dispose = 0;
1533 } while (!last_fragment);
1534
1535 hdr[0] = slot;
1536 hdr[1] = connection_id;
1537 status = copy_to_user(buf, hdr, 2);
1538 if (status) {
1539 status = -EFAULT;
1540 goto exit;
1541 }
1542 status = pktlen;
1543
1544 exit:
1545 return status;
1546 }
1547
1548
1549 /**
1550 * Implementation of file open syscall.
1551 *
1552 * @inode: Inode concerned.
1553 * @file: File concerned.
1554 *
1555 * @return 0 on success, <0 on failure.
1556 */
1557 static int dvb_ca_en50221_io_open(struct inode *inode, struct file *file)
1558 {
1559 struct dvb_device *dvbdev = file->private_data;
1560 struct dvb_ca_private *ca = dvbdev->priv;
1561 int err;
1562 int i;
1563
1564 dprintk("%s\n", __func__);
1565
1566 if (!try_module_get(ca->pub->owner))
1567 return -EIO;
1568
1569 err = dvb_generic_open(inode, file);
1570 if (err < 0) {
1571 module_put(ca->pub->owner);
1572 return err;
1573 }
1574
1575 for (i = 0; i < ca->slot_count; i++) {
1576
1577 if (ca->slot_info[i].slot_state == DVB_CA_SLOTSTATE_RUNNING) {
1578 if (ca->slot_info[i].rx_buffer.data != NULL) {
1579 /* it is safe to call this here without locks because
1580 * ca->open == 0. Data is not read in this case */
1581 dvb_ringbuffer_flush(&ca->slot_info[i].rx_buffer);
1582 }
1583 }
1584 }
1585
1586 ca->open = 1;
1587 dvb_ca_en50221_thread_update_delay(ca);
1588 dvb_ca_en50221_thread_wakeup(ca);
1589
1590 dvb_ca_private_get(ca);
1591
1592 return 0;
1593 }
1594
1595
1596 /**
1597 * Implementation of file close syscall.
1598 *
1599 * @inode: Inode concerned.
1600 * @file: File concerned.
1601 *
1602 * @return 0 on success, <0 on failure.
1603 */
1604 static int dvb_ca_en50221_io_release(struct inode *inode, struct file *file)
1605 {
1606 struct dvb_device *dvbdev = file->private_data;
1607 struct dvb_ca_private *ca = dvbdev->priv;
1608 int err;
1609
1610 dprintk("%s\n", __func__);
1611
1612 /* mark the CA device as closed */
1613 ca->open = 0;
1614 dvb_ca_en50221_thread_update_delay(ca);
1615
1616 err = dvb_generic_release(inode, file);
1617
1618 module_put(ca->pub->owner);
1619
1620 dvb_ca_private_put(ca);
1621
1622 return err;
1623 }
1624
1625
1626 /**
1627 * Implementation of poll() syscall.
1628 *
1629 * @file: File concerned.
1630 * @wait: poll wait table.
1631 *
1632 * @return Standard poll mask.
1633 */
1634 static unsigned int dvb_ca_en50221_io_poll(struct file *file, poll_table * wait)
1635 {
1636 struct dvb_device *dvbdev = file->private_data;
1637 struct dvb_ca_private *ca = dvbdev->priv;
1638 unsigned int mask = 0;
1639 int slot;
1640 int result = 0;
1641
1642 dprintk("%s\n", __func__);
1643
1644 if (dvb_ca_en50221_io_read_condition(ca, &result, &slot) == 1) {
1645 mask |= POLLIN;
1646 }
1647
1648 /* if there is something, return now */
1649 if (mask)
1650 return mask;
1651
1652 /* wait for something to happen */
1653 poll_wait(file, &ca->wait_queue, wait);
1654
1655 if (dvb_ca_en50221_io_read_condition(ca, &result, &slot) == 1) {
1656 mask |= POLLIN;
1657 }
1658
1659 return mask;
1660 }
1661 EXPORT_SYMBOL(dvb_ca_en50221_init);
1662
1663
1664 static const struct file_operations dvb_ca_fops = {
1665 .owner = THIS_MODULE,
1666 .read = dvb_ca_en50221_io_read,
1667 .write = dvb_ca_en50221_io_write,
1668 .unlocked_ioctl = dvb_ca_en50221_io_ioctl,
1669 .open = dvb_ca_en50221_io_open,
1670 .release = dvb_ca_en50221_io_release,
1671 .poll = dvb_ca_en50221_io_poll,
1672 .llseek = noop_llseek,
1673 };
1674
1675 static const struct dvb_device dvbdev_ca = {
1676 .priv = NULL,
1677 .users = 1,
1678 .readers = 1,
1679 .writers = 1,
1680 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
1681 .name = "dvb-ca-en50221",
1682 #endif
1683 .fops = &dvb_ca_fops,
1684 };
1685
1686 /* ******************************************************************************** */
1687 /* Initialisation/shutdown functions */
1688
1689
1690 /**
1691 * Initialise a new DVB CA EN50221 interface device.
1692 *
1693 * @dvb_adapter: DVB adapter to attach the new CA device to.
1694 * @ca: The dvb_ca instance.
1695 * @flags: Flags describing the CA device (DVB_CA_FLAG_*).
1696 * @slot_count: Number of slots supported.
1697 *
1698 * @return 0 on success, nonzero on failure
1699 */
1700 int dvb_ca_en50221_init(struct dvb_adapter *dvb_adapter,
1701 struct dvb_ca_en50221 *pubca, int flags, int slot_count)
1702 {
1703 int ret;
1704 struct dvb_ca_private *ca = NULL;
1705 int i;
1706
1707 dprintk("%s\n", __func__);
1708
1709 if (slot_count < 1)
1710 return -EINVAL;
1711
1712 /* initialise the system data */
1713 if ((ca = kzalloc(sizeof(struct dvb_ca_private), GFP_KERNEL)) == NULL) {
1714 ret = -ENOMEM;
1715 goto exit;
1716 }
1717 kref_init(&ca->refcount);
1718 ca->pub = pubca;
1719 ca->flags = flags;
1720 ca->slot_count = slot_count;
1721 if ((ca->slot_info = kcalloc(slot_count, sizeof(struct dvb_ca_slot), GFP_KERNEL)) == NULL) {
1722 ret = -ENOMEM;
1723 goto free_ca;
1724 }
1725 init_waitqueue_head(&ca->wait_queue);
1726 ca->open = 0;
1727 ca->wakeup = 0;
1728 ca->next_read_slot = 0;
1729 pubca->private = ca;
1730
1731 /* register the DVB device */
1732 ret = dvb_register_device(dvb_adapter, &ca->dvbdev, &dvbdev_ca, ca, DVB_DEVICE_CA, 0);
1733 if (ret)
1734 goto free_slot_info;
1735
1736 /* now initialise each slot */
1737 for (i = 0; i < slot_count; i++) {
1738 memset(&ca->slot_info[i], 0, sizeof(struct dvb_ca_slot));
1739 ca->slot_info[i].slot_state = DVB_CA_SLOTSTATE_NONE;
1740 atomic_set(&ca->slot_info[i].camchange_count, 0);
1741 ca->slot_info[i].camchange_type = DVB_CA_EN50221_CAMCHANGE_REMOVED;
1742 mutex_init(&ca->slot_info[i].slot_lock);
1743 }
1744
1745 mutex_init(&ca->ioctl_mutex);
1746
1747 if (signal_pending(current)) {
1748 ret = -EINTR;
1749 goto unregister_device;
1750 }
1751 mb();
1752
1753 /* create a kthread for monitoring this CA device */
1754 ca->thread = kthread_run(dvb_ca_en50221_thread, ca, "kdvb-ca-%i:%i",
1755 ca->dvbdev->adapter->num, ca->dvbdev->id);
1756 if (IS_ERR(ca->thread)) {
1757 ret = PTR_ERR(ca->thread);
1758 printk("dvb_ca_init: failed to start kernel_thread (%d)\n",
1759 ret);
1760 goto unregister_device;
1761 }
1762 return 0;
1763
1764 unregister_device:
1765 dvb_unregister_device(ca->dvbdev);
1766 free_slot_info:
1767 kfree(ca->slot_info);
1768 free_ca:
1769 kfree(ca);
1770 exit:
1771 pubca->private = NULL;
1772 return ret;
1773 }
1774 EXPORT_SYMBOL(dvb_ca_en50221_release);
1775
1776
1777
1778 /**
1779 * Release a DVB CA EN50221 interface device.
1780 *
1781 * @ca_dev: The dvb_device_t instance for the CA device.
1782 * @ca: The associated dvb_ca instance.
1783 */
1784 void dvb_ca_en50221_release(struct dvb_ca_en50221 *pubca)
1785 {
1786 struct dvb_ca_private *ca = pubca->private;
1787 int i;
1788
1789 dprintk("%s\n", __func__);
1790
1791 /* shutdown the thread if there was one */
1792 kthread_stop(ca->thread);
1793
1794 for (i = 0; i < ca->slot_count; i++) {
1795 dvb_ca_en50221_slot_shutdown(ca, i);
1796 }
1797 dvb_ca_private_put(ca);
1798 pubca->private = NULL;
1799 }
CRIS linux kernel tree