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[mirror_ubuntu-artful-kernel.git] / drivers / media / dvb-core / dvb_ca_en50221.c
1 /*
2 * dvb_ca.c: generic DVB functions for EN50221 CAM interfaces
3 *
4 * Copyright (C) 2004 Andrew de Quincey
5 *
6 * Parts of this file were based on sources as follows:
7 *
8 * Copyright (C) 2003 Ralph Metzler <rjkm@metzlerbros.de>
9 *
10 * based on code:
11 *
12 * Copyright (C) 1999-2002 Ralph Metzler
13 * & Marcus Metzler for convergence integrated media GmbH
14 *
15 * This program is free software; you can redistribute it and/or
16 * modify it under the terms of the GNU General Public License
17 * as published by the Free Software Foundation; either version 2
18 * of the License, or (at your option) any later version.
19 *
20 * This program is distributed in the hope that it will be useful,
21 * but WITHOUT ANY WARRANTY; without even the implied warranty of
22 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
23 * GNU General Public License for more details.
24 * To obtain the license, point your browser to
25 * http://www.gnu.org/copyleft/gpl.html
26 */
27
28 #define pr_fmt(fmt) "dvb_ca_en50221: " fmt
29
30 #include <linux/errno.h>
31 #include <linux/slab.h>
32 #include <linux/list.h>
33 #include <linux/module.h>
34 #include <linux/vmalloc.h>
35 #include <linux/delay.h>
36 #include <linux/spinlock.h>
37 #include <linux/sched/signal.h>
38 #include <linux/kthread.h>
39
40 #include "dvb_ca_en50221.h"
41 #include "dvb_ringbuffer.h"
42
43 static int dvb_ca_en50221_debug;
44
45 module_param_named(cam_debug, dvb_ca_en50221_debug, int, 0644);
46 MODULE_PARM_DESC(cam_debug, "enable verbose debug messages");
47
48 #define dprintk(fmt, arg...) do { \
49 if (dvb_ca_en50221_debug) \
50 printk(KERN_DEBUG pr_fmt("%s: " fmt), __func__, ##arg);\
51 } while (0)
52
53 #define INIT_TIMEOUT_SECS 10
54
55 #define HOST_LINK_BUF_SIZE 0x200
56
57 #define RX_BUFFER_SIZE 65535
58
59 #define MAX_RX_PACKETS_PER_ITERATION 10
60
61 #define CTRLIF_DATA 0
62 #define CTRLIF_COMMAND 1
63 #define CTRLIF_STATUS 1
64 #define CTRLIF_SIZE_LOW 2
65 #define CTRLIF_SIZE_HIGH 3
66
67 #define CMDREG_HC 1 /* Host control */
68 #define CMDREG_SW 2 /* Size write */
69 #define CMDREG_SR 4 /* Size read */
70 #define CMDREG_RS 8 /* Reset interface */
71 #define CMDREG_FRIE 0x40 /* Enable FR interrupt */
72 #define CMDREG_DAIE 0x80 /* Enable DA interrupt */
73 #define IRQEN (CMDREG_DAIE)
74
75 #define STATUSREG_RE 1 /* read error */
76 #define STATUSREG_WE 2 /* write error */
77 #define STATUSREG_FR 0x40 /* module free */
78 #define STATUSREG_DA 0x80 /* data available */
79 #define STATUSREG_TXERR (STATUSREG_RE|STATUSREG_WE) /* general transfer error */
80
81
82 #define DVB_CA_SLOTSTATE_NONE 0
83 #define DVB_CA_SLOTSTATE_UNINITIALISED 1
84 #define DVB_CA_SLOTSTATE_RUNNING 2
85 #define DVB_CA_SLOTSTATE_INVALID 3
86 #define DVB_CA_SLOTSTATE_WAITREADY 4
87 #define DVB_CA_SLOTSTATE_VALIDATE 5
88 #define DVB_CA_SLOTSTATE_WAITFR 6
89 #define DVB_CA_SLOTSTATE_LINKINIT 7
90
91
92 /* Information on a CA slot */
93 struct dvb_ca_slot {
94
95 /* current state of the CAM */
96 int slot_state;
97
98 /* mutex used for serializing access to one CI slot */
99 struct mutex slot_lock;
100
101 /* Number of CAMCHANGES that have occurred since last processing */
102 atomic_t camchange_count;
103
104 /* Type of last CAMCHANGE */
105 int camchange_type;
106
107 /* base address of CAM config */
108 u32 config_base;
109
110 /* value to write into Config Control register */
111 u8 config_option;
112
113 /* if 1, the CAM supports DA IRQs */
114 u8 da_irq_supported:1;
115
116 /* size of the buffer to use when talking to the CAM */
117 int link_buf_size;
118
119 /* buffer for incoming packets */
120 struct dvb_ringbuffer rx_buffer;
121
122 /* timer used during various states of the slot */
123 unsigned long timeout;
124 };
125
126 /* Private CA-interface information */
127 struct dvb_ca_private {
128 struct kref refcount;
129
130 /* pointer back to the public data structure */
131 struct dvb_ca_en50221 *pub;
132
133 /* the DVB device */
134 struct dvb_device *dvbdev;
135
136 /* Flags describing the interface (DVB_CA_FLAG_*) */
137 u32 flags;
138
139 /* number of slots supported by this CA interface */
140 unsigned int slot_count;
141
142 /* information on each slot */
143 struct dvb_ca_slot *slot_info;
144
145 /* wait queues for read() and write() operations */
146 wait_queue_head_t wait_queue;
147
148 /* PID of the monitoring thread */
149 struct task_struct *thread;
150
151 /* Flag indicating if the CA device is open */
152 unsigned int open:1;
153
154 /* Flag indicating the thread should wake up now */
155 unsigned int wakeup:1;
156
157 /* Delay the main thread should use */
158 unsigned long delay;
159
160 /* Slot to start looking for data to read from in the next user-space read operation */
161 int next_read_slot;
162
163 /* mutex serializing ioctls */
164 struct mutex ioctl_mutex;
165 };
166
167 static void dvb_ca_private_free(struct dvb_ca_private *ca)
168 {
169 unsigned int i;
170
171 dvb_free_device(ca->dvbdev);
172 for (i = 0; i < ca->slot_count; i++)
173 vfree(ca->slot_info[i].rx_buffer.data);
174
175 kfree(ca->slot_info);
176 kfree(ca);
177 }
178
179 static void dvb_ca_private_release(struct kref *ref)
180 {
181 struct dvb_ca_private *ca = container_of(ref, struct dvb_ca_private, refcount);
182 dvb_ca_private_free(ca);
183 }
184
185 static void dvb_ca_private_get(struct dvb_ca_private *ca)
186 {
187 kref_get(&ca->refcount);
188 }
189
190 static void dvb_ca_private_put(struct dvb_ca_private *ca)
191 {
192 kref_put(&ca->refcount, dvb_ca_private_release);
193 }
194
195 static void dvb_ca_en50221_thread_wakeup(struct dvb_ca_private *ca);
196 static int dvb_ca_en50221_read_data(struct dvb_ca_private *ca, int slot, u8 * ebuf, int ecount);
197 static int dvb_ca_en50221_write_data(struct dvb_ca_private *ca, int slot, u8 * ebuf, int ecount);
198
199
200 /**
201 * Safely find needle in haystack.
202 *
203 * @haystack: Buffer to look in.
204 * @hlen: Number of bytes in haystack.
205 * @needle: Buffer to find.
206 * @nlen: Number of bytes in needle.
207 * @return Pointer into haystack needle was found at, or NULL if not found.
208 */
209 static char *findstr(char * haystack, int hlen, char * needle, int nlen)
210 {
211 int i;
212
213 if (hlen < nlen)
214 return NULL;
215
216 for (i = 0; i <= hlen - nlen; i++) {
217 if (!strncmp(haystack + i, needle, nlen))
218 return haystack + i;
219 }
220
221 return NULL;
222 }
223
224
225
226 /* ******************************************************************************** */
227 /* EN50221 physical interface functions */
228
229
230 /**
231 * dvb_ca_en50221_check_camstatus - Check CAM status.
232 */
233 static int dvb_ca_en50221_check_camstatus(struct dvb_ca_private *ca, int slot)
234 {
235 int slot_status;
236 int cam_present_now;
237 int cam_changed;
238
239 /* IRQ mode */
240 if (ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE) {
241 return (atomic_read(&ca->slot_info[slot].camchange_count) != 0);
242 }
243
244 /* poll mode */
245 slot_status = ca->pub->poll_slot_status(ca->pub, slot, ca->open);
246
247 cam_present_now = (slot_status & DVB_CA_EN50221_POLL_CAM_PRESENT) ? 1 : 0;
248 cam_changed = (slot_status & DVB_CA_EN50221_POLL_CAM_CHANGED) ? 1 : 0;
249 if (!cam_changed) {
250 int cam_present_old = (ca->slot_info[slot].slot_state != DVB_CA_SLOTSTATE_NONE);
251 cam_changed = (cam_present_now != cam_present_old);
252 }
253
254 if (cam_changed) {
255 if (!cam_present_now) {
256 ca->slot_info[slot].camchange_type = DVB_CA_EN50221_CAMCHANGE_REMOVED;
257 } else {
258 ca->slot_info[slot].camchange_type = DVB_CA_EN50221_CAMCHANGE_INSERTED;
259 }
260 atomic_set(&ca->slot_info[slot].camchange_count, 1);
261 } else {
262 if ((ca->slot_info[slot].slot_state == DVB_CA_SLOTSTATE_WAITREADY) &&
263 (slot_status & DVB_CA_EN50221_POLL_CAM_READY)) {
264 // move to validate state if reset is completed
265 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_VALIDATE;
266 }
267 }
268
269 return cam_changed;
270 }
271
272
273 /**
274 * dvb_ca_en50221_wait_if_status - Wait for flags to become set on the STATUS
275 * register on a CAM interface, checking for errors and timeout.
276 *
277 * @ca: CA instance.
278 * @slot: Slot on interface.
279 * @waitfor: Flags to wait for.
280 * @timeout_ms: Timeout in milliseconds.
281 *
282 * @return 0 on success, nonzero on error.
283 */
284 static int dvb_ca_en50221_wait_if_status(struct dvb_ca_private *ca, int slot,
285 u8 waitfor, int timeout_hz)
286 {
287 unsigned long timeout;
288 unsigned long start;
289
290 dprintk("%s\n", __func__);
291
292 /* loop until timeout elapsed */
293 start = jiffies;
294 timeout = jiffies + timeout_hz;
295 while (1) {
296 /* read the status and check for error */
297 int res = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS);
298 if (res < 0)
299 return -EIO;
300
301 /* if we got the flags, it was successful! */
302 if (res & waitfor) {
303 dprintk("%s succeeded timeout:%lu\n",
304 __func__, jiffies - start);
305 return 0;
306 }
307
308 /* check for timeout */
309 if (time_after(jiffies, timeout)) {
310 break;
311 }
312
313 /* wait for a bit */
314 msleep(1);
315 }
316
317 dprintk("%s failed timeout:%lu\n", __func__, jiffies - start);
318
319 /* if we get here, we've timed out */
320 return -ETIMEDOUT;
321 }
322
323
324 /**
325 * dvb_ca_en50221_link_init - Initialise the link layer connection to a CAM.
326 *
327 * @ca: CA instance.
328 * @slot: Slot id.
329 *
330 * @return 0 on success, nonzero on failure.
331 */
332 static int dvb_ca_en50221_link_init(struct dvb_ca_private *ca, int slot)
333 {
334 int ret;
335 int buf_size;
336 u8 buf[2];
337
338 dprintk("%s\n", __func__);
339
340 /* we'll be determining these during this function */
341 ca->slot_info[slot].da_irq_supported = 0;
342
343 /* set the host link buffer size temporarily. it will be overwritten with the
344 * real negotiated size later. */
345 ca->slot_info[slot].link_buf_size = 2;
346
347 /* read the buffer size from the CAM */
348 if ((ret = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, IRQEN | CMDREG_SR)) != 0)
349 return ret;
350 if ((ret = dvb_ca_en50221_wait_if_status(ca, slot, STATUSREG_DA, HZ / 10)) != 0)
351 return ret;
352 if ((ret = dvb_ca_en50221_read_data(ca, slot, buf, 2)) != 2)
353 return -EIO;
354 if ((ret = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, IRQEN)) != 0)
355 return ret;
356
357 /* store it, and choose the minimum of our buffer and the CAM's buffer size */
358 buf_size = (buf[0] << 8) | buf[1];
359 if (buf_size > HOST_LINK_BUF_SIZE)
360 buf_size = HOST_LINK_BUF_SIZE;
361 ca->slot_info[slot].link_buf_size = buf_size;
362 buf[0] = buf_size >> 8;
363 buf[1] = buf_size & 0xff;
364 dprintk("Chosen link buffer size of %i\n", buf_size);
365
366 /* write the buffer size to the CAM */
367 if ((ret = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, IRQEN | CMDREG_SW)) != 0)
368 return ret;
369 if ((ret = dvb_ca_en50221_wait_if_status(ca, slot, STATUSREG_FR, HZ / 10)) != 0)
370 return ret;
371 if ((ret = dvb_ca_en50221_write_data(ca, slot, buf, 2)) != 2)
372 return -EIO;
373 if ((ret = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, IRQEN)) != 0)
374 return ret;
375
376 /* success */
377 return 0;
378 }
379
380 /**
381 * dvb_ca_en50221_read_tuple - Read a tuple from attribute memory.
382 *
383 * @ca: CA instance.
384 * @slot: Slot id.
385 * @address: Address to read from. Updated.
386 * @tupleType: Tuple id byte. Updated.
387 * @tupleLength: Tuple length. Updated.
388 * @tuple: Dest buffer for tuple (must be 256 bytes). Updated.
389 *
390 * @return 0 on success, nonzero on error.
391 */
392 static int dvb_ca_en50221_read_tuple(struct dvb_ca_private *ca, int slot,
393 int *address, int *tupleType, int *tupleLength, u8 * tuple)
394 {
395 int i;
396 int _tupleType;
397 int _tupleLength;
398 int _address = *address;
399
400 /* grab the next tuple length and type */
401 if ((_tupleType = ca->pub->read_attribute_mem(ca->pub, slot, _address)) < 0)
402 return _tupleType;
403 if (_tupleType == 0xff) {
404 dprintk("END OF CHAIN TUPLE type:0x%x\n", _tupleType);
405 *address += 2;
406 *tupleType = _tupleType;
407 *tupleLength = 0;
408 return 0;
409 }
410 if ((_tupleLength = ca->pub->read_attribute_mem(ca->pub, slot, _address + 2)) < 0)
411 return _tupleLength;
412 _address += 4;
413
414 dprintk("TUPLE type:0x%x length:%i\n", _tupleType, _tupleLength);
415
416 /* read in the whole tuple */
417 for (i = 0; i < _tupleLength; i++) {
418 tuple[i] = ca->pub->read_attribute_mem(ca->pub, slot, _address + (i * 2));
419 dprintk(" 0x%02x: 0x%02x %c\n",
420 i, tuple[i] & 0xff,
421 ((tuple[i] > 31) && (tuple[i] < 127)) ? tuple[i] : '.');
422 }
423 _address += (_tupleLength * 2);
424
425 // success
426 *tupleType = _tupleType;
427 *tupleLength = _tupleLength;
428 *address = _address;
429 return 0;
430 }
431
432
433 /**
434 * dvb_ca_en50221_parse_attributes - Parse attribute memory of a CAM module,
435 * extracting Config register, and checking it is a DVB CAM module.
436 *
437 * @ca: CA instance.
438 * @slot: Slot id.
439 *
440 * @return 0 on success, <0 on failure.
441 */
442 static int dvb_ca_en50221_parse_attributes(struct dvb_ca_private *ca, int slot)
443 {
444 int address = 0;
445 int tupleLength;
446 int tupleType;
447 u8 tuple[257];
448 char *dvb_str;
449 int rasz;
450 int status;
451 int got_cftableentry = 0;
452 int end_chain = 0;
453 int i;
454 u16 manfid = 0;
455 u16 devid = 0;
456
457
458 // CISTPL_DEVICE_0A
459 if ((status =
460 dvb_ca_en50221_read_tuple(ca, slot, &address, &tupleType, &tupleLength, tuple)) < 0)
461 return status;
462 if (tupleType != 0x1D)
463 return -EINVAL;
464
465
466
467 // CISTPL_DEVICE_0C
468 if ((status =
469 dvb_ca_en50221_read_tuple(ca, slot, &address, &tupleType, &tupleLength, tuple)) < 0)
470 return status;
471 if (tupleType != 0x1C)
472 return -EINVAL;
473
474
475
476 // CISTPL_VERS_1
477 if ((status =
478 dvb_ca_en50221_read_tuple(ca, slot, &address, &tupleType, &tupleLength, tuple)) < 0)
479 return status;
480 if (tupleType != 0x15)
481 return -EINVAL;
482
483
484
485 // CISTPL_MANFID
486 if ((status = dvb_ca_en50221_read_tuple(ca, slot, &address, &tupleType,
487 &tupleLength, tuple)) < 0)
488 return status;
489 if (tupleType != 0x20)
490 return -EINVAL;
491 if (tupleLength != 4)
492 return -EINVAL;
493 manfid = (tuple[1] << 8) | tuple[0];
494 devid = (tuple[3] << 8) | tuple[2];
495
496
497
498 // CISTPL_CONFIG
499 if ((status = dvb_ca_en50221_read_tuple(ca, slot, &address, &tupleType,
500 &tupleLength, tuple)) < 0)
501 return status;
502 if (tupleType != 0x1A)
503 return -EINVAL;
504 if (tupleLength < 3)
505 return -EINVAL;
506
507 /* extract the configbase */
508 rasz = tuple[0] & 3;
509 if (tupleLength < (3 + rasz + 14))
510 return -EINVAL;
511 ca->slot_info[slot].config_base = 0;
512 for (i = 0; i < rasz + 1; i++) {
513 ca->slot_info[slot].config_base |= (tuple[2 + i] << (8 * i));
514 }
515
516 /* check it contains the correct DVB string */
517 dvb_str = findstr((char *)tuple, tupleLength, "DVB_CI_V", 8);
518 if (dvb_str == NULL)
519 return -EINVAL;
520 if (tupleLength < ((dvb_str - (char *) tuple) + 12))
521 return -EINVAL;
522
523 /* is it a version we support? */
524 if (strncmp(dvb_str + 8, "1.00", 4)) {
525 pr_err("dvb_ca adapter %d: Unsupported DVB CAM module version %c%c%c%c\n",
526 ca->dvbdev->adapter->num, dvb_str[8], dvb_str[9],
527 dvb_str[10], dvb_str[11]);
528 return -EINVAL;
529 }
530
531 /* process the CFTABLE_ENTRY tuples, and any after those */
532 while ((!end_chain) && (address < 0x1000)) {
533 if ((status = dvb_ca_en50221_read_tuple(ca, slot, &address, &tupleType,
534 &tupleLength, tuple)) < 0)
535 return status;
536 switch (tupleType) {
537 case 0x1B: // CISTPL_CFTABLE_ENTRY
538 if (tupleLength < (2 + 11 + 17))
539 break;
540
541 /* if we've already parsed one, just use it */
542 if (got_cftableentry)
543 break;
544
545 /* get the config option */
546 ca->slot_info[slot].config_option = tuple[0] & 0x3f;
547
548 /* OK, check it contains the correct strings */
549 if ((findstr((char *)tuple, tupleLength, "DVB_HOST", 8) == NULL) ||
550 (findstr((char *)tuple, tupleLength, "DVB_CI_MODULE", 13) == NULL))
551 break;
552
553 got_cftableentry = 1;
554 break;
555
556 case 0x14: // CISTPL_NO_LINK
557 break;
558
559 case 0xFF: // CISTPL_END
560 end_chain = 1;
561 break;
562
563 default: /* Unknown tuple type - just skip this tuple and move to the next one */
564 dprintk("dvb_ca: Skipping unknown tuple type:0x%x length:0x%x\n",
565 tupleType, tupleLength);
566 break;
567 }
568 }
569
570 if ((address > 0x1000) || (!got_cftableentry))
571 return -EINVAL;
572
573 dprintk("Valid DVB CAM detected MANID:%x DEVID:%x CONFIGBASE:0x%x CONFIGOPTION:0x%x\n",
574 manfid, devid, ca->slot_info[slot].config_base,
575 ca->slot_info[slot].config_option);
576
577 // success!
578 return 0;
579 }
580
581
582 /**
583 * dvb_ca_en50221_set_configoption - Set CAM's configoption correctly.
584 *
585 * @ca: CA instance.
586 * @slot: Slot containing the CAM.
587 */
588 static int dvb_ca_en50221_set_configoption(struct dvb_ca_private *ca, int slot)
589 {
590 int configoption;
591
592 dprintk("%s\n", __func__);
593
594 /* set the config option */
595 ca->pub->write_attribute_mem(ca->pub, slot,
596 ca->slot_info[slot].config_base,
597 ca->slot_info[slot].config_option);
598
599 /* check it */
600 configoption = ca->pub->read_attribute_mem(ca->pub, slot, ca->slot_info[slot].config_base);
601 dprintk("Set configoption 0x%x, read configoption 0x%x\n",
602 ca->slot_info[slot].config_option, configoption & 0x3f);
603
604 /* fine! */
605 return 0;
606
607 }
608
609
610 /**
611 * dvb_ca_en50221_read_data - This function talks to an EN50221 CAM control
612 * interface. It reads a buffer of data from the CAM. The data can either
613 * be stored in a supplied buffer, or automatically be added to the slot's
614 * rx_buffer.
615 *
616 * @ca: CA instance.
617 * @slot: Slot to read from.
618 * @ebuf: If non-NULL, the data will be written to this buffer. If NULL,
619 * the data will be added into the buffering system as a normal fragment.
620 * @ecount: Size of ebuf. Ignored if ebuf is NULL.
621 *
622 * @return Number of bytes read, or < 0 on error
623 */
624 static int dvb_ca_en50221_read_data(struct dvb_ca_private *ca, int slot, u8 * ebuf, int ecount)
625 {
626 int bytes_read;
627 int status;
628 u8 buf[HOST_LINK_BUF_SIZE];
629 int i;
630
631 dprintk("%s\n", __func__);
632
633 /* check if we have space for a link buf in the rx_buffer */
634 if (ebuf == NULL) {
635 int buf_free;
636
637 if (ca->slot_info[slot].rx_buffer.data == NULL) {
638 status = -EIO;
639 goto exit;
640 }
641 buf_free = dvb_ringbuffer_free(&ca->slot_info[slot].rx_buffer);
642
643 if (buf_free < (ca->slot_info[slot].link_buf_size + DVB_RINGBUFFER_PKTHDRSIZE)) {
644 status = -EAGAIN;
645 goto exit;
646 }
647 }
648
649 /* check if there is data available */
650 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS)) < 0)
651 goto exit;
652 if (!(status & STATUSREG_DA)) {
653 /* no data */
654 status = 0;
655 goto exit;
656 }
657
658 /* read the amount of data */
659 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_SIZE_HIGH)) < 0)
660 goto exit;
661 bytes_read = status << 8;
662 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_SIZE_LOW)) < 0)
663 goto exit;
664 bytes_read |= status;
665
666 /* check it will fit */
667 if (ebuf == NULL) {
668 if (bytes_read > ca->slot_info[slot].link_buf_size) {
669 pr_err("dvb_ca adapter %d: CAM tried to send a buffer larger than the link buffer size (%i > %i)!\n",
670 ca->dvbdev->adapter->num, bytes_read,
671 ca->slot_info[slot].link_buf_size);
672 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_LINKINIT;
673 status = -EIO;
674 goto exit;
675 }
676 if (bytes_read < 2) {
677 pr_err("dvb_ca adapter %d: CAM sent a buffer that was less than 2 bytes!\n",
678 ca->dvbdev->adapter->num);
679 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_LINKINIT;
680 status = -EIO;
681 goto exit;
682 }
683 } else {
684 if (bytes_read > ecount) {
685 pr_err("dvb_ca adapter %d: CAM tried to send a buffer larger than the ecount size!\n",
686 ca->dvbdev->adapter->num);
687 status = -EIO;
688 goto exit;
689 }
690 }
691
692 /* fill the buffer */
693 for (i = 0; i < bytes_read; i++) {
694 /* read byte and check */
695 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_DATA)) < 0)
696 goto exit;
697
698 /* OK, store it in the buffer */
699 buf[i] = status;
700 }
701
702 /* check for read error (RE should now be 0) */
703 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS)) < 0)
704 goto exit;
705 if (status & STATUSREG_RE) {
706 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_LINKINIT;
707 status = -EIO;
708 goto exit;
709 }
710
711 /* OK, add it to the receive buffer, or copy into external buffer if supplied */
712 if (ebuf == NULL) {
713 if (ca->slot_info[slot].rx_buffer.data == NULL) {
714 status = -EIO;
715 goto exit;
716 }
717 dvb_ringbuffer_pkt_write(&ca->slot_info[slot].rx_buffer, buf, bytes_read);
718 } else {
719 memcpy(ebuf, buf, bytes_read);
720 }
721
722 dprintk("Received CA packet for slot %i connection id 0x%x last_frag:%i size:0x%x\n", slot,
723 buf[0], (buf[1] & 0x80) == 0, bytes_read);
724
725 /* wake up readers when a last_fragment is received */
726 if ((buf[1] & 0x80) == 0x00) {
727 wake_up_interruptible(&ca->wait_queue);
728 }
729 status = bytes_read;
730
731 exit:
732 return status;
733 }
734
735
736 /**
737 * dvb_ca_en50221_write_data - This function talks to an EN50221 CAM control
738 * interface. It writes a buffer of data to a CAM.
739 *
740 * @ca: CA instance.
741 * @slot: Slot to write to.
742 * @ebuf: The data in this buffer is treated as a complete link-level packet to
743 * be written.
744 * @count: Size of ebuf.
745 *
746 * @return Number of bytes written, or < 0 on error.
747 */
748 static int dvb_ca_en50221_write_data(struct dvb_ca_private *ca, int slot, u8 * buf, int bytes_write)
749 {
750 int status;
751 int i;
752
753 dprintk("%s\n", __func__);
754
755
756 /* sanity check */
757 if (bytes_write > ca->slot_info[slot].link_buf_size)
758 return -EINVAL;
759
760 /* it is possible we are dealing with a single buffer implementation,
761 thus if there is data available for read or if there is even a read
762 already in progress, we do nothing but awake the kernel thread to
763 process the data if necessary. */
764 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS)) < 0)
765 goto exitnowrite;
766 if (status & (STATUSREG_DA | STATUSREG_RE)) {
767 if (status & STATUSREG_DA)
768 dvb_ca_en50221_thread_wakeup(ca);
769
770 status = -EAGAIN;
771 goto exitnowrite;
772 }
773
774 /* OK, set HC bit */
775 if ((status = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND,
776 IRQEN | CMDREG_HC)) != 0)
777 goto exit;
778
779 /* check if interface is still free */
780 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS)) < 0)
781 goto exit;
782 if (!(status & STATUSREG_FR)) {
783 /* it wasn't free => try again later */
784 status = -EAGAIN;
785 goto exit;
786 }
787
788 /* send the amount of data */
789 if ((status = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_SIZE_HIGH, bytes_write >> 8)) != 0)
790 goto exit;
791 if ((status = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_SIZE_LOW,
792 bytes_write & 0xff)) != 0)
793 goto exit;
794
795 /* send the buffer */
796 for (i = 0; i < bytes_write; i++) {
797 if ((status = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_DATA, buf[i])) != 0)
798 goto exit;
799 }
800
801 /* check for write error (WE should now be 0) */
802 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS)) < 0)
803 goto exit;
804 if (status & STATUSREG_WE) {
805 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_LINKINIT;
806 status = -EIO;
807 goto exit;
808 }
809 status = bytes_write;
810
811 dprintk("Wrote CA packet for slot %i, connection id 0x%x last_frag:%i size:0x%x\n", slot,
812 buf[0], (buf[1] & 0x80) == 0, bytes_write);
813
814 exit:
815 ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, IRQEN);
816
817 exitnowrite:
818 return status;
819 }
820 EXPORT_SYMBOL(dvb_ca_en50221_camchange_irq);
821
822
823
824 /* ******************************************************************************** */
825 /* EN50221 higher level functions */
826
827
828 /**
829 * dvb_ca_en50221_camready_irq - A CAM has been removed => shut it down.
830 *
831 * @ca: CA instance.
832 * @slot: Slot to shut down.
833 */
834 static int dvb_ca_en50221_slot_shutdown(struct dvb_ca_private *ca, int slot)
835 {
836 dprintk("%s\n", __func__);
837
838 ca->pub->slot_shutdown(ca->pub, slot);
839 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_NONE;
840
841 /* need to wake up all processes to check if they're now
842 trying to write to a defunct CAM */
843 wake_up_interruptible(&ca->wait_queue);
844
845 dprintk("Slot %i shutdown\n", slot);
846
847 /* success */
848 return 0;
849 }
850 EXPORT_SYMBOL(dvb_ca_en50221_camready_irq);
851
852
853 /**
854 * dvb_ca_en50221_camready_irq - A CAMCHANGE IRQ has occurred.
855 *
856 * @ca: CA instance.
857 * @slot: Slot concerned.
858 * @change_type: One of the DVB_CA_CAMCHANGE_* values.
859 */
860 void dvb_ca_en50221_camchange_irq(struct dvb_ca_en50221 *pubca, int slot, int change_type)
861 {
862 struct dvb_ca_private *ca = pubca->private;
863
864 dprintk("CAMCHANGE IRQ slot:%i change_type:%i\n", slot, change_type);
865
866 switch (change_type) {
867 case DVB_CA_EN50221_CAMCHANGE_REMOVED:
868 case DVB_CA_EN50221_CAMCHANGE_INSERTED:
869 break;
870
871 default:
872 return;
873 }
874
875 ca->slot_info[slot].camchange_type = change_type;
876 atomic_inc(&ca->slot_info[slot].camchange_count);
877 dvb_ca_en50221_thread_wakeup(ca);
878 }
879 EXPORT_SYMBOL(dvb_ca_en50221_frda_irq);
880
881
882 /**
883 * dvb_ca_en50221_camready_irq - A CAMREADY IRQ has occurred.
884 *
885 * @ca: CA instance.
886 * @slot: Slot concerned.
887 */
888 void dvb_ca_en50221_camready_irq(struct dvb_ca_en50221 *pubca, int slot)
889 {
890 struct dvb_ca_private *ca = pubca->private;
891
892 dprintk("CAMREADY IRQ slot:%i\n", slot);
893
894 if (ca->slot_info[slot].slot_state == DVB_CA_SLOTSTATE_WAITREADY) {
895 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_VALIDATE;
896 dvb_ca_en50221_thread_wakeup(ca);
897 }
898 }
899
900
901 /**
902 * An FR or DA IRQ has occurred.
903 *
904 * @ca: CA instance.
905 * @slot: Slot concerned.
906 */
907 void dvb_ca_en50221_frda_irq(struct dvb_ca_en50221 *pubca, int slot)
908 {
909 struct dvb_ca_private *ca = pubca->private;
910 int flags;
911
912 dprintk("FR/DA IRQ slot:%i\n", slot);
913
914 switch (ca->slot_info[slot].slot_state) {
915 case DVB_CA_SLOTSTATE_LINKINIT:
916 flags = ca->pub->read_cam_control(pubca, slot, CTRLIF_STATUS);
917 if (flags & STATUSREG_DA) {
918 dprintk("CAM supports DA IRQ\n");
919 ca->slot_info[slot].da_irq_supported = 1;
920 }
921 break;
922
923 case DVB_CA_SLOTSTATE_RUNNING:
924 if (ca->open)
925 dvb_ca_en50221_thread_wakeup(ca);
926 break;
927 }
928 }
929
930
931
932 /* ******************************************************************************** */
933 /* EN50221 thread functions */
934
935 /**
936 * Wake up the DVB CA thread
937 *
938 * @ca: CA instance.
939 */
940 static void dvb_ca_en50221_thread_wakeup(struct dvb_ca_private *ca)
941 {
942
943 dprintk("%s\n", __func__);
944
945 ca->wakeup = 1;
946 mb();
947 wake_up_process(ca->thread);
948 }
949
950 /**
951 * Update the delay used by the thread.
952 *
953 * @ca: CA instance.
954 */
955 static void dvb_ca_en50221_thread_update_delay(struct dvb_ca_private *ca)
956 {
957 int delay;
958 int curdelay = 100000000;
959 int slot;
960
961 /* Beware of too high polling frequency, because one polling
962 * call might take several hundred milliseconds until timeout!
963 */
964 for (slot = 0; slot < ca->slot_count; slot++) {
965 switch (ca->slot_info[slot].slot_state) {
966 default:
967 case DVB_CA_SLOTSTATE_NONE:
968 delay = HZ * 60; /* 60s */
969 if (!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE))
970 delay = HZ * 5; /* 5s */
971 break;
972 case DVB_CA_SLOTSTATE_INVALID:
973 delay = HZ * 60; /* 60s */
974 if (!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE))
975 delay = HZ / 10; /* 100ms */
976 break;
977
978 case DVB_CA_SLOTSTATE_UNINITIALISED:
979 case DVB_CA_SLOTSTATE_WAITREADY:
980 case DVB_CA_SLOTSTATE_VALIDATE:
981 case DVB_CA_SLOTSTATE_WAITFR:
982 case DVB_CA_SLOTSTATE_LINKINIT:
983 delay = HZ / 10; /* 100ms */
984 break;
985
986 case DVB_CA_SLOTSTATE_RUNNING:
987 delay = HZ * 60; /* 60s */
988 if (!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE))
989 delay = HZ / 10; /* 100ms */
990 if (ca->open) {
991 if ((!ca->slot_info[slot].da_irq_supported) ||
992 (!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_DA)))
993 delay = HZ / 10; /* 100ms */
994 }
995 break;
996 }
997
998 if (delay < curdelay)
999 curdelay = delay;
1000 }
1001
1002 ca->delay = curdelay;
1003 }
1004
1005
1006
1007 /**
1008 * Kernel thread which monitors CA slots for CAM changes, and performs data transfers.
1009 */
1010 static int dvb_ca_en50221_thread(void *data)
1011 {
1012 struct dvb_ca_private *ca = data;
1013 int slot;
1014 int flags;
1015 int status;
1016 int pktcount;
1017 void *rxbuf;
1018
1019 dprintk("%s\n", __func__);
1020
1021 /* choose the correct initial delay */
1022 dvb_ca_en50221_thread_update_delay(ca);
1023
1024 /* main loop */
1025 while (!kthread_should_stop()) {
1026 /* sleep for a bit */
1027 if (!ca->wakeup) {
1028 set_current_state(TASK_INTERRUPTIBLE);
1029 schedule_timeout(ca->delay);
1030 if (kthread_should_stop())
1031 return 0;
1032 }
1033 ca->wakeup = 0;
1034
1035 /* go through all the slots processing them */
1036 for (slot = 0; slot < ca->slot_count; slot++) {
1037
1038 mutex_lock(&ca->slot_info[slot].slot_lock);
1039
1040 // check the cam status + deal with CAMCHANGEs
1041 while (dvb_ca_en50221_check_camstatus(ca, slot)) {
1042 /* clear down an old CI slot if necessary */
1043 if (ca->slot_info[slot].slot_state != DVB_CA_SLOTSTATE_NONE)
1044 dvb_ca_en50221_slot_shutdown(ca, slot);
1045
1046 /* if a CAM is NOW present, initialise it */
1047 if (ca->slot_info[slot].camchange_type == DVB_CA_EN50221_CAMCHANGE_INSERTED) {
1048 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_UNINITIALISED;
1049 }
1050
1051 /* we've handled one CAMCHANGE */
1052 dvb_ca_en50221_thread_update_delay(ca);
1053 atomic_dec(&ca->slot_info[slot].camchange_count);
1054 }
1055
1056 // CAM state machine
1057 switch (ca->slot_info[slot].slot_state) {
1058 case DVB_CA_SLOTSTATE_NONE:
1059 case DVB_CA_SLOTSTATE_INVALID:
1060 // no action needed
1061 break;
1062
1063 case DVB_CA_SLOTSTATE_UNINITIALISED:
1064 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_WAITREADY;
1065 ca->pub->slot_reset(ca->pub, slot);
1066 ca->slot_info[slot].timeout = jiffies + (INIT_TIMEOUT_SECS * HZ);
1067 break;
1068
1069 case DVB_CA_SLOTSTATE_WAITREADY:
1070 if (time_after(jiffies, ca->slot_info[slot].timeout)) {
1071 pr_err("dvb_ca adaptor %d: PC card did not respond :(\n",
1072 ca->dvbdev->adapter->num);
1073 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID;
1074 dvb_ca_en50221_thread_update_delay(ca);
1075 break;
1076 }
1077 // no other action needed; will automatically change state when ready
1078 break;
1079
1080 case DVB_CA_SLOTSTATE_VALIDATE:
1081 if (dvb_ca_en50221_parse_attributes(ca, slot) != 0) {
1082 /* we need this extra check for annoying interfaces like the budget-av */
1083 if ((!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE)) &&
1084 (ca->pub->poll_slot_status)) {
1085 status = ca->pub->poll_slot_status(ca->pub, slot, 0);
1086 if (!(status & DVB_CA_EN50221_POLL_CAM_PRESENT)) {
1087 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_NONE;
1088 dvb_ca_en50221_thread_update_delay(ca);
1089 break;
1090 }
1091 }
1092
1093 pr_err("dvb_ca adapter %d: Invalid PC card inserted :(\n",
1094 ca->dvbdev->adapter->num);
1095 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID;
1096 dvb_ca_en50221_thread_update_delay(ca);
1097 break;
1098 }
1099 if (dvb_ca_en50221_set_configoption(ca, slot) != 0) {
1100 pr_err("dvb_ca adapter %d: Unable to initialise CAM :(\n",
1101 ca->dvbdev->adapter->num);
1102 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID;
1103 dvb_ca_en50221_thread_update_delay(ca);
1104 break;
1105 }
1106 if (ca->pub->write_cam_control(ca->pub, slot,
1107 CTRLIF_COMMAND, CMDREG_RS) != 0) {
1108 pr_err("dvb_ca adapter %d: Unable to reset CAM IF\n",
1109 ca->dvbdev->adapter->num);
1110 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID;
1111 dvb_ca_en50221_thread_update_delay(ca);
1112 break;
1113 }
1114 dprintk("DVB CAM validated successfully\n");
1115
1116 ca->slot_info[slot].timeout = jiffies + (INIT_TIMEOUT_SECS * HZ);
1117 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_WAITFR;
1118 ca->wakeup = 1;
1119 break;
1120
1121 case DVB_CA_SLOTSTATE_WAITFR:
1122 if (time_after(jiffies, ca->slot_info[slot].timeout)) {
1123 pr_err("dvb_ca adapter %d: DVB CAM did not respond :(\n",
1124 ca->dvbdev->adapter->num);
1125 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID;
1126 dvb_ca_en50221_thread_update_delay(ca);
1127 break;
1128 }
1129
1130 flags = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS);
1131 if (flags & STATUSREG_FR) {
1132 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_LINKINIT;
1133 ca->wakeup = 1;
1134 }
1135 break;
1136
1137 case DVB_CA_SLOTSTATE_LINKINIT:
1138 if (dvb_ca_en50221_link_init(ca, slot) != 0) {
1139 /* we need this extra check for annoying interfaces like the budget-av */
1140 if ((!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE)) &&
1141 (ca->pub->poll_slot_status)) {
1142 status = ca->pub->poll_slot_status(ca->pub, slot, 0);
1143 if (!(status & DVB_CA_EN50221_POLL_CAM_PRESENT)) {
1144 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_NONE;
1145 dvb_ca_en50221_thread_update_delay(ca);
1146 break;
1147 }
1148 }
1149
1150 pr_err("dvb_ca adapter %d: DVB CAM link initialisation failed :(\n",
1151 ca->dvbdev->adapter->num);
1152 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID;
1153 dvb_ca_en50221_thread_update_delay(ca);
1154 break;
1155 }
1156
1157 if (ca->slot_info[slot].rx_buffer.data == NULL) {
1158 rxbuf = vmalloc(RX_BUFFER_SIZE);
1159 if (rxbuf == NULL) {
1160 pr_err("dvb_ca adapter %d: Unable to allocate CAM rx buffer :(\n",
1161 ca->dvbdev->adapter->num);
1162 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID;
1163 dvb_ca_en50221_thread_update_delay(ca);
1164 break;
1165 }
1166 dvb_ringbuffer_init(&ca->slot_info[slot].rx_buffer, rxbuf, RX_BUFFER_SIZE);
1167 }
1168
1169 ca->pub->slot_ts_enable(ca->pub, slot);
1170 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_RUNNING;
1171 dvb_ca_en50221_thread_update_delay(ca);
1172 pr_err("dvb_ca adapter %d: DVB CAM detected and initialised successfully\n",
1173 ca->dvbdev->adapter->num);
1174 break;
1175
1176 case DVB_CA_SLOTSTATE_RUNNING:
1177 if (!ca->open)
1178 break;
1179
1180 // poll slots for data
1181 pktcount = 0;
1182 while ((status = dvb_ca_en50221_read_data(ca, slot, NULL, 0)) > 0) {
1183 if (!ca->open)
1184 break;
1185
1186 /* if a CAMCHANGE occurred at some point, do not do any more processing of this slot */
1187 if (dvb_ca_en50221_check_camstatus(ca, slot)) {
1188 // we dont want to sleep on the next iteration so we can handle the cam change
1189 ca->wakeup = 1;
1190 break;
1191 }
1192
1193 /* check if we've hit our limit this time */
1194 if (++pktcount >= MAX_RX_PACKETS_PER_ITERATION) {
1195 // dont sleep; there is likely to be more data to read
1196 ca->wakeup = 1;
1197 break;
1198 }
1199 }
1200 break;
1201 }
1202
1203 mutex_unlock(&ca->slot_info[slot].slot_lock);
1204 }
1205 }
1206
1207 return 0;
1208 }
1209
1210
1211
1212 /* ******************************************************************************** */
1213 /* EN50221 IO interface functions */
1214
1215 /**
1216 * Real ioctl implementation.
1217 * NOTE: CA_SEND_MSG/CA_GET_MSG ioctls have userspace buffers passed to them.
1218 *
1219 * @inode: Inode concerned.
1220 * @file: File concerned.
1221 * @cmd: IOCTL command.
1222 * @arg: Associated argument.
1223 *
1224 * @return 0 on success, <0 on error.
1225 */
1226 static int dvb_ca_en50221_io_do_ioctl(struct file *file,
1227 unsigned int cmd, void *parg)
1228 {
1229 struct dvb_device *dvbdev = file->private_data;
1230 struct dvb_ca_private *ca = dvbdev->priv;
1231 int err = 0;
1232 int slot;
1233
1234 dprintk("%s\n", __func__);
1235
1236 if (mutex_lock_interruptible(&ca->ioctl_mutex))
1237 return -ERESTARTSYS;
1238
1239 switch (cmd) {
1240 case CA_RESET:
1241 for (slot = 0; slot < ca->slot_count; slot++) {
1242 mutex_lock(&ca->slot_info[slot].slot_lock);
1243 if (ca->slot_info[slot].slot_state != DVB_CA_SLOTSTATE_NONE) {
1244 dvb_ca_en50221_slot_shutdown(ca, slot);
1245 if (ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE)
1246 dvb_ca_en50221_camchange_irq(ca->pub,
1247 slot,
1248 DVB_CA_EN50221_CAMCHANGE_INSERTED);
1249 }
1250 mutex_unlock(&ca->slot_info[slot].slot_lock);
1251 }
1252 ca->next_read_slot = 0;
1253 dvb_ca_en50221_thread_wakeup(ca);
1254 break;
1255
1256 case CA_GET_CAP: {
1257 struct ca_caps *caps = parg;
1258
1259 caps->slot_num = ca->slot_count;
1260 caps->slot_type = CA_CI_LINK;
1261 caps->descr_num = 0;
1262 caps->descr_type = 0;
1263 break;
1264 }
1265
1266 case CA_GET_SLOT_INFO: {
1267 struct ca_slot_info *info = parg;
1268
1269 if ((info->num > ca->slot_count) || (info->num < 0)) {
1270 err = -EINVAL;
1271 goto out_unlock;
1272 }
1273
1274 info->type = CA_CI_LINK;
1275 info->flags = 0;
1276 if ((ca->slot_info[info->num].slot_state != DVB_CA_SLOTSTATE_NONE)
1277 && (ca->slot_info[info->num].slot_state != DVB_CA_SLOTSTATE_INVALID)) {
1278 info->flags = CA_CI_MODULE_PRESENT;
1279 }
1280 if (ca->slot_info[info->num].slot_state == DVB_CA_SLOTSTATE_RUNNING) {
1281 info->flags |= CA_CI_MODULE_READY;
1282 }
1283 break;
1284 }
1285
1286 default:
1287 err = -EINVAL;
1288 break;
1289 }
1290
1291 out_unlock:
1292 mutex_unlock(&ca->ioctl_mutex);
1293 return err;
1294 }
1295
1296
1297 /**
1298 * Wrapper for ioctl implementation.
1299 *
1300 * @inode: Inode concerned.
1301 * @file: File concerned.
1302 * @cmd: IOCTL command.
1303 * @arg: Associated argument.
1304 *
1305 * @return 0 on success, <0 on error.
1306 */
1307 static long dvb_ca_en50221_io_ioctl(struct file *file,
1308 unsigned int cmd, unsigned long arg)
1309 {
1310 return dvb_usercopy(file, cmd, arg, dvb_ca_en50221_io_do_ioctl);
1311 }
1312
1313
1314 /**
1315 * Implementation of write() syscall.
1316 *
1317 * @file: File structure.
1318 * @buf: Source buffer.
1319 * @count: Size of source buffer.
1320 * @ppos: Position in file (ignored).
1321 *
1322 * @return Number of bytes read, or <0 on error.
1323 */
1324 static ssize_t dvb_ca_en50221_io_write(struct file *file,
1325 const char __user * buf, size_t count, loff_t * ppos)
1326 {
1327 struct dvb_device *dvbdev = file->private_data;
1328 struct dvb_ca_private *ca = dvbdev->priv;
1329 u8 slot, connection_id;
1330 int status;
1331 u8 fragbuf[HOST_LINK_BUF_SIZE];
1332 int fragpos = 0;
1333 int fraglen;
1334 unsigned long timeout;
1335 int written;
1336
1337 dprintk("%s\n", __func__);
1338
1339 /* Incoming packet has a 2 byte header. hdr[0] = slot_id, hdr[1] = connection_id */
1340 if (count < 2)
1341 return -EINVAL;
1342
1343 /* extract slot & connection id */
1344 if (copy_from_user(&slot, buf, 1))
1345 return -EFAULT;
1346 if (copy_from_user(&connection_id, buf + 1, 1))
1347 return -EFAULT;
1348 buf += 2;
1349 count -= 2;
1350
1351 /* check if the slot is actually running */
1352 if (ca->slot_info[slot].slot_state != DVB_CA_SLOTSTATE_RUNNING)
1353 return -EINVAL;
1354
1355 /* fragment the packets & store in the buffer */
1356 while (fragpos < count) {
1357 fraglen = ca->slot_info[slot].link_buf_size - 2;
1358 if (fraglen < 0)
1359 break;
1360 if (fraglen > HOST_LINK_BUF_SIZE - 2)
1361 fraglen = HOST_LINK_BUF_SIZE - 2;
1362 if ((count - fragpos) < fraglen)
1363 fraglen = count - fragpos;
1364
1365 fragbuf[0] = connection_id;
1366 fragbuf[1] = ((fragpos + fraglen) < count) ? 0x80 : 0x00;
1367 status = copy_from_user(fragbuf + 2, buf + fragpos, fraglen);
1368 if (status) {
1369 status = -EFAULT;
1370 goto exit;
1371 }
1372
1373 timeout = jiffies + HZ / 2;
1374 written = 0;
1375 while (!time_after(jiffies, timeout)) {
1376 /* check the CAM hasn't been removed/reset in the meantime */
1377 if (ca->slot_info[slot].slot_state != DVB_CA_SLOTSTATE_RUNNING) {
1378 status = -EIO;
1379 goto exit;
1380 }
1381
1382 mutex_lock(&ca->slot_info[slot].slot_lock);
1383 status = dvb_ca_en50221_write_data(ca, slot, fragbuf, fraglen + 2);
1384 mutex_unlock(&ca->slot_info[slot].slot_lock);
1385 if (status == (fraglen + 2)) {
1386 written = 1;
1387 break;
1388 }
1389 if (status != -EAGAIN)
1390 goto exit;
1391
1392 msleep(1);
1393 }
1394 if (!written) {
1395 status = -EIO;
1396 goto exit;
1397 }
1398
1399 fragpos += fraglen;
1400 }
1401 status = count + 2;
1402
1403 exit:
1404 return status;
1405 }
1406
1407
1408 /**
1409 * Condition for waking up in dvb_ca_en50221_io_read_condition
1410 */
1411 static int dvb_ca_en50221_io_read_condition(struct dvb_ca_private *ca,
1412 int *result, int *_slot)
1413 {
1414 int slot;
1415 int slot_count = 0;
1416 int idx;
1417 size_t fraglen;
1418 int connection_id = -1;
1419 int found = 0;
1420 u8 hdr[2];
1421
1422 slot = ca->next_read_slot;
1423 while ((slot_count < ca->slot_count) && (!found)) {
1424 if (ca->slot_info[slot].slot_state != DVB_CA_SLOTSTATE_RUNNING)
1425 goto nextslot;
1426
1427 if (ca->slot_info[slot].rx_buffer.data == NULL) {
1428 return 0;
1429 }
1430
1431 idx = dvb_ringbuffer_pkt_next(&ca->slot_info[slot].rx_buffer, -1, &fraglen);
1432 while (idx != -1) {
1433 dvb_ringbuffer_pkt_read(&ca->slot_info[slot].rx_buffer, idx, 0, hdr, 2);
1434 if (connection_id == -1)
1435 connection_id = hdr[0];
1436 if ((hdr[0] == connection_id) && ((hdr[1] & 0x80) == 0)) {
1437 *_slot = slot;
1438 found = 1;
1439 break;
1440 }
1441
1442 idx = dvb_ringbuffer_pkt_next(&ca->slot_info[slot].rx_buffer, idx, &fraglen);
1443 }
1444
1445 nextslot:
1446 slot = (slot + 1) % ca->slot_count;
1447 slot_count++;
1448 }
1449
1450 ca->next_read_slot = slot;
1451 return found;
1452 }
1453
1454
1455 /**
1456 * Implementation of read() syscall.
1457 *
1458 * @file: File structure.
1459 * @buf: Destination buffer.
1460 * @count: Size of destination buffer.
1461 * @ppos: Position in file (ignored).
1462 *
1463 * @return Number of bytes read, or <0 on error.
1464 */
1465 static ssize_t dvb_ca_en50221_io_read(struct file *file, char __user * buf,
1466 size_t count, loff_t * ppos)
1467 {
1468 struct dvb_device *dvbdev = file->private_data;
1469 struct dvb_ca_private *ca = dvbdev->priv;
1470 int status;
1471 int result = 0;
1472 u8 hdr[2];
1473 int slot;
1474 int connection_id = -1;
1475 size_t idx, idx2;
1476 int last_fragment = 0;
1477 size_t fraglen;
1478 int pktlen;
1479 int dispose = 0;
1480
1481 dprintk("%s\n", __func__);
1482
1483 /* Outgoing packet has a 2 byte header. hdr[0] = slot_id, hdr[1] = connection_id */
1484 if (count < 2)
1485 return -EINVAL;
1486
1487 /* wait for some data */
1488 if ((status = dvb_ca_en50221_io_read_condition(ca, &result, &slot)) == 0) {
1489
1490 /* if we're in nonblocking mode, exit immediately */
1491 if (file->f_flags & O_NONBLOCK)
1492 return -EWOULDBLOCK;
1493
1494 /* wait for some data */
1495 status = wait_event_interruptible(ca->wait_queue,
1496 dvb_ca_en50221_io_read_condition
1497 (ca, &result, &slot));
1498 }
1499 if ((status < 0) || (result < 0)) {
1500 if (result)
1501 return result;
1502 return status;
1503 }
1504
1505 idx = dvb_ringbuffer_pkt_next(&ca->slot_info[slot].rx_buffer, -1, &fraglen);
1506 pktlen = 2;
1507 do {
1508 if (idx == -1) {
1509 pr_err("dvb_ca adapter %d: BUG: read packet ended before last_fragment encountered\n",
1510 ca->dvbdev->adapter->num);
1511 status = -EIO;
1512 goto exit;
1513 }
1514
1515 dvb_ringbuffer_pkt_read(&ca->slot_info[slot].rx_buffer, idx, 0, hdr, 2);
1516 if (connection_id == -1)
1517 connection_id = hdr[0];
1518 if (hdr[0] == connection_id) {
1519 if (pktlen < count) {
1520 if ((pktlen + fraglen - 2) > count) {
1521 fraglen = count - pktlen;
1522 } else {
1523 fraglen -= 2;
1524 }
1525
1526 if ((status = dvb_ringbuffer_pkt_read_user(&ca->slot_info[slot].rx_buffer, idx, 2,
1527 buf + pktlen, fraglen)) < 0) {
1528 goto exit;
1529 }
1530 pktlen += fraglen;
1531 }
1532
1533 if ((hdr[1] & 0x80) == 0)
1534 last_fragment = 1;
1535 dispose = 1;
1536 }
1537
1538 idx2 = dvb_ringbuffer_pkt_next(&ca->slot_info[slot].rx_buffer, idx, &fraglen);
1539 if (dispose)
1540 dvb_ringbuffer_pkt_dispose(&ca->slot_info[slot].rx_buffer, idx);
1541 idx = idx2;
1542 dispose = 0;
1543 } while (!last_fragment);
1544
1545 hdr[0] = slot;
1546 hdr[1] = connection_id;
1547 status = copy_to_user(buf, hdr, 2);
1548 if (status) {
1549 status = -EFAULT;
1550 goto exit;
1551 }
1552 status = pktlen;
1553
1554 exit:
1555 return status;
1556 }
1557
1558
1559 /**
1560 * Implementation of file open syscall.
1561 *
1562 * @inode: Inode concerned.
1563 * @file: File concerned.
1564 *
1565 * @return 0 on success, <0 on failure.
1566 */
1567 static int dvb_ca_en50221_io_open(struct inode *inode, struct file *file)
1568 {
1569 struct dvb_device *dvbdev = file->private_data;
1570 struct dvb_ca_private *ca = dvbdev->priv;
1571 int err;
1572 int i;
1573
1574 dprintk("%s\n", __func__);
1575
1576 if (!try_module_get(ca->pub->owner))
1577 return -EIO;
1578
1579 err = dvb_generic_open(inode, file);
1580 if (err < 0) {
1581 module_put(ca->pub->owner);
1582 return err;
1583 }
1584
1585 for (i = 0; i < ca->slot_count; i++) {
1586
1587 if (ca->slot_info[i].slot_state == DVB_CA_SLOTSTATE_RUNNING) {
1588 if (ca->slot_info[i].rx_buffer.data != NULL) {
1589 /* it is safe to call this here without locks because
1590 * ca->open == 0. Data is not read in this case */
1591 dvb_ringbuffer_flush(&ca->slot_info[i].rx_buffer);
1592 }
1593 }
1594 }
1595
1596 ca->open = 1;
1597 dvb_ca_en50221_thread_update_delay(ca);
1598 dvb_ca_en50221_thread_wakeup(ca);
1599
1600 dvb_ca_private_get(ca);
1601
1602 return 0;
1603 }
1604
1605
1606 /**
1607 * Implementation of file close syscall.
1608 *
1609 * @inode: Inode concerned.
1610 * @file: File concerned.
1611 *
1612 * @return 0 on success, <0 on failure.
1613 */
1614 static int dvb_ca_en50221_io_release(struct inode *inode, struct file *file)
1615 {
1616 struct dvb_device *dvbdev = file->private_data;
1617 struct dvb_ca_private *ca = dvbdev->priv;
1618 int err;
1619
1620 dprintk("%s\n", __func__);
1621
1622 /* mark the CA device as closed */
1623 ca->open = 0;
1624 dvb_ca_en50221_thread_update_delay(ca);
1625
1626 err = dvb_generic_release(inode, file);
1627
1628 module_put(ca->pub->owner);
1629
1630 dvb_ca_private_put(ca);
1631
1632 return err;
1633 }
1634
1635
1636 /**
1637 * Implementation of poll() syscall.
1638 *
1639 * @file: File concerned.
1640 * @wait: poll wait table.
1641 *
1642 * @return Standard poll mask.
1643 */
1644 static unsigned int dvb_ca_en50221_io_poll(struct file *file, poll_table * wait)
1645 {
1646 struct dvb_device *dvbdev = file->private_data;
1647 struct dvb_ca_private *ca = dvbdev->priv;
1648 unsigned int mask = 0;
1649 int slot;
1650 int result = 0;
1651
1652 dprintk("%s\n", __func__);
1653
1654 if (dvb_ca_en50221_io_read_condition(ca, &result, &slot) == 1) {
1655 mask |= POLLIN;
1656 }
1657
1658 /* if there is something, return now */
1659 if (mask)
1660 return mask;
1661
1662 /* wait for something to happen */
1663 poll_wait(file, &ca->wait_queue, wait);
1664
1665 if (dvb_ca_en50221_io_read_condition(ca, &result, &slot) == 1) {
1666 mask |= POLLIN;
1667 }
1668
1669 return mask;
1670 }
1671 EXPORT_SYMBOL(dvb_ca_en50221_init);
1672
1673
1674 static const struct file_operations dvb_ca_fops = {
1675 .owner = THIS_MODULE,
1676 .read = dvb_ca_en50221_io_read,
1677 .write = dvb_ca_en50221_io_write,
1678 .unlocked_ioctl = dvb_ca_en50221_io_ioctl,
1679 .open = dvb_ca_en50221_io_open,
1680 .release = dvb_ca_en50221_io_release,
1681 .poll = dvb_ca_en50221_io_poll,
1682 .llseek = noop_llseek,
1683 };
1684
1685 static const struct dvb_device dvbdev_ca = {
1686 .priv = NULL,
1687 .users = 1,
1688 .readers = 1,
1689 .writers = 1,
1690 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
1691 .name = "dvb-ca-en50221",
1692 #endif
1693 .fops = &dvb_ca_fops,
1694 };
1695
1696 /* ******************************************************************************** */
1697 /* Initialisation/shutdown functions */
1698
1699
1700 /**
1701 * Initialise a new DVB CA EN50221 interface device.
1702 *
1703 * @dvb_adapter: DVB adapter to attach the new CA device to.
1704 * @ca: The dvb_ca instance.
1705 * @flags: Flags describing the CA device (DVB_CA_FLAG_*).
1706 * @slot_count: Number of slots supported.
1707 *
1708 * @return 0 on success, nonzero on failure
1709 */
1710 int dvb_ca_en50221_init(struct dvb_adapter *dvb_adapter,
1711 struct dvb_ca_en50221 *pubca, int flags, int slot_count)
1712 {
1713 int ret;
1714 struct dvb_ca_private *ca = NULL;
1715 int i;
1716
1717 dprintk("%s\n", __func__);
1718
1719 if (slot_count < 1)
1720 return -EINVAL;
1721
1722 /* initialise the system data */
1723 if ((ca = kzalloc(sizeof(struct dvb_ca_private), GFP_KERNEL)) == NULL) {
1724 ret = -ENOMEM;
1725 goto exit;
1726 }
1727 kref_init(&ca->refcount);
1728 ca->pub = pubca;
1729 ca->flags = flags;
1730 ca->slot_count = slot_count;
1731 if ((ca->slot_info = kcalloc(slot_count, sizeof(struct dvb_ca_slot), GFP_KERNEL)) == NULL) {
1732 ret = -ENOMEM;
1733 goto free_ca;
1734 }
1735 init_waitqueue_head(&ca->wait_queue);
1736 ca->open = 0;
1737 ca->wakeup = 0;
1738 ca->next_read_slot = 0;
1739 pubca->private = ca;
1740
1741 /* register the DVB device */
1742 ret = dvb_register_device(dvb_adapter, &ca->dvbdev, &dvbdev_ca, ca, DVB_DEVICE_CA, 0);
1743 if (ret)
1744 goto free_slot_info;
1745
1746 /* now initialise each slot */
1747 for (i = 0; i < slot_count; i++) {
1748 memset(&ca->slot_info[i], 0, sizeof(struct dvb_ca_slot));
1749 ca->slot_info[i].slot_state = DVB_CA_SLOTSTATE_NONE;
1750 atomic_set(&ca->slot_info[i].camchange_count, 0);
1751 ca->slot_info[i].camchange_type = DVB_CA_EN50221_CAMCHANGE_REMOVED;
1752 mutex_init(&ca->slot_info[i].slot_lock);
1753 }
1754
1755 mutex_init(&ca->ioctl_mutex);
1756
1757 if (signal_pending(current)) {
1758 ret = -EINTR;
1759 goto unregister_device;
1760 }
1761 mb();
1762
1763 /* create a kthread for monitoring this CA device */
1764 ca->thread = kthread_run(dvb_ca_en50221_thread, ca, "kdvb-ca-%i:%i",
1765 ca->dvbdev->adapter->num, ca->dvbdev->id);
1766 if (IS_ERR(ca->thread)) {
1767 ret = PTR_ERR(ca->thread);
1768 pr_err("dvb_ca_init: failed to start kernel_thread (%d)\n",
1769 ret);
1770 goto unregister_device;
1771 }
1772 return 0;
1773
1774 unregister_device:
1775 dvb_unregister_device(ca->dvbdev);
1776 free_slot_info:
1777 kfree(ca->slot_info);
1778 free_ca:
1779 kfree(ca);
1780 exit:
1781 pubca->private = NULL;
1782 return ret;
1783 }
1784 EXPORT_SYMBOL(dvb_ca_en50221_release);
1785
1786
1787
1788 /**
1789 * Release a DVB CA EN50221 interface device.
1790 *
1791 * @ca_dev: The dvb_device_t instance for the CA device.
1792 * @ca: The associated dvb_ca instance.
1793 */
1794 void dvb_ca_en50221_release(struct dvb_ca_en50221 *pubca)
1795 {
1796 struct dvb_ca_private *ca = pubca->private;
1797 int i;
1798
1799 dprintk("%s\n", __func__);
1800
1801 /* shutdown the thread if there was one */
1802 kthread_stop(ca->thread);
1803
1804 for (i = 0; i < ca->slot_count; i++) {
1805 dvb_ca_en50221_slot_shutdown(ca, i);
1806 }
1807 dvb_remove_device(ca->dvbdev);
1808 dvb_ca_private_put(ca);
1809 pubca->private = NULL;
1810 }
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