1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* |
3 | * dvb_ca.c: generic DVB functions for EN50221 CAM interfaces |
4 | * |
5 | * Copyright (C) 2004 Andrew de Quincey |
6 | * |
7 | * Parts of this file were based on sources as follows: |
8 | * |
9 | * Copyright (C) 2003 Ralph Metzler <rjkm@metzlerbros.de> |
10 | * |
11 | * based on code: |
12 | * |
13 | * Copyright (C) 1999-2002 Ralph Metzler |
14 | * & Marcus Metzler for convergence integrated media GmbH |
15 | */ |
16 | |
17 | #define pr_fmt(fmt) "dvb_ca_en50221: " fmt |
18 | |
19 | #include <linux/errno.h> |
20 | #include <linux/slab.h> |
21 | #include <linux/list.h> |
22 | #include <linux/module.h> |
23 | #include <linux/nospec.h> |
24 | #include <linux/vmalloc.h> |
25 | #include <linux/delay.h> |
26 | #include <linux/spinlock.h> |
27 | #include <linux/sched/signal.h> |
28 | #include <linux/kthread.h> |
29 | |
30 | #include <media/dvb_ca_en50221.h> |
31 | #include <media/dvb_ringbuffer.h> |
32 | |
33 | static int dvb_ca_en50221_debug; |
34 | |
35 | module_param_named(cam_debug, dvb_ca_en50221_debug, int, 0644); |
36 | MODULE_PARM_DESC(cam_debug, "enable verbose debug messages" ); |
37 | |
38 | #define dprintk(fmt, arg...) do { \ |
39 | if (dvb_ca_en50221_debug) \ |
40 | printk(KERN_DEBUG pr_fmt("%s: " fmt), __func__, ##arg);\ |
41 | } while (0) |
42 | |
43 | #define INIT_TIMEOUT_SECS 10 |
44 | |
45 | #define HOST_LINK_BUF_SIZE 0x200 |
46 | |
47 | #define RX_BUFFER_SIZE 65535 |
48 | |
49 | #define MAX_RX_PACKETS_PER_ITERATION 10 |
50 | |
51 | #define CTRLIF_DATA 0 |
52 | #define CTRLIF_COMMAND 1 |
53 | #define CTRLIF_STATUS 1 |
54 | #define CTRLIF_SIZE_LOW 2 |
55 | #define CTRLIF_SIZE_HIGH 3 |
56 | |
57 | #define CMDREG_HC 1 /* Host control */ |
58 | #define CMDREG_SW 2 /* Size write */ |
59 | #define CMDREG_SR 4 /* Size read */ |
60 | #define CMDREG_RS 8 /* Reset interface */ |
61 | #define CMDREG_FRIE 0x40 /* Enable FR interrupt */ |
62 | #define CMDREG_DAIE 0x80 /* Enable DA interrupt */ |
63 | #define IRQEN (CMDREG_DAIE) |
64 | |
65 | #define STATUSREG_RE 1 /* read error */ |
66 | #define STATUSREG_WE 2 /* write error */ |
67 | #define STATUSREG_FR 0x40 /* module free */ |
68 | #define STATUSREG_DA 0x80 /* data available */ |
69 | |
70 | #define DVB_CA_SLOTSTATE_NONE 0 |
71 | #define DVB_CA_SLOTSTATE_UNINITIALISED 1 |
72 | #define DVB_CA_SLOTSTATE_RUNNING 2 |
73 | #define DVB_CA_SLOTSTATE_INVALID 3 |
74 | #define DVB_CA_SLOTSTATE_WAITREADY 4 |
75 | #define DVB_CA_SLOTSTATE_VALIDATE 5 |
76 | #define DVB_CA_SLOTSTATE_WAITFR 6 |
77 | #define DVB_CA_SLOTSTATE_LINKINIT 7 |
78 | |
79 | /* Information on a CA slot */ |
80 | struct dvb_ca_slot { |
81 | /* current state of the CAM */ |
82 | int slot_state; |
83 | |
84 | /* mutex used for serializing access to one CI slot */ |
85 | struct mutex slot_lock; |
86 | |
87 | /* Number of CAMCHANGES that have occurred since last processing */ |
88 | atomic_t camchange_count; |
89 | |
90 | /* Type of last CAMCHANGE */ |
91 | int camchange_type; |
92 | |
93 | /* base address of CAM config */ |
94 | u32 config_base; |
95 | |
96 | /* value to write into Config Control register */ |
97 | u8 config_option; |
98 | |
99 | /* if 1, the CAM supports DA IRQs */ |
100 | u8 da_irq_supported:1; |
101 | |
102 | /* size of the buffer to use when talking to the CAM */ |
103 | int link_buf_size; |
104 | |
105 | /* buffer for incoming packets */ |
106 | struct dvb_ringbuffer rx_buffer; |
107 | |
108 | /* timer used during various states of the slot */ |
109 | unsigned long timeout; |
110 | }; |
111 | |
112 | /* Private CA-interface information */ |
113 | struct dvb_ca_private { |
114 | struct kref refcount; |
115 | |
116 | /* pointer back to the public data structure */ |
117 | struct dvb_ca_en50221 *pub; |
118 | |
119 | /* the DVB device */ |
120 | struct dvb_device *dvbdev; |
121 | |
122 | /* Flags describing the interface (DVB_CA_FLAG_*) */ |
123 | u32 flags; |
124 | |
125 | /* number of slots supported by this CA interface */ |
126 | unsigned int slot_count; |
127 | |
128 | /* information on each slot */ |
129 | struct dvb_ca_slot *slot_info; |
130 | |
131 | /* wait queues for read() and write() operations */ |
132 | wait_queue_head_t wait_queue; |
133 | |
134 | /* PID of the monitoring thread */ |
135 | struct task_struct *thread; |
136 | |
137 | /* Flag indicating if the CA device is open */ |
138 | unsigned int open:1; |
139 | |
140 | /* Flag indicating the thread should wake up now */ |
141 | unsigned int wakeup:1; |
142 | |
143 | /* Delay the main thread should use */ |
144 | unsigned long delay; |
145 | |
146 | /* |
147 | * Slot to start looking for data to read from in the next user-space |
148 | * read operation |
149 | */ |
150 | int next_read_slot; |
151 | |
152 | /* mutex serializing ioctls */ |
153 | struct mutex ioctl_mutex; |
154 | |
155 | /* A mutex used when a device is disconnected */ |
156 | struct mutex remove_mutex; |
157 | |
158 | /* Whether the device is disconnected */ |
159 | int exit; |
160 | }; |
161 | |
162 | static void dvb_ca_private_free(struct dvb_ca_private *ca) |
163 | { |
164 | unsigned int i; |
165 | |
166 | dvb_device_put(dvbdev: ca->dvbdev); |
167 | for (i = 0; i < ca->slot_count; i++) |
168 | vfree(addr: ca->slot_info[i].rx_buffer.data); |
169 | |
170 | kfree(objp: ca->slot_info); |
171 | kfree(objp: ca); |
172 | } |
173 | |
174 | static void dvb_ca_private_release(struct kref *ref) |
175 | { |
176 | struct dvb_ca_private *ca; |
177 | |
178 | ca = container_of(ref, struct dvb_ca_private, refcount); |
179 | dvb_ca_private_free(ca); |
180 | } |
181 | |
182 | static void dvb_ca_private_get(struct dvb_ca_private *ca) |
183 | { |
184 | kref_get(kref: &ca->refcount); |
185 | } |
186 | |
187 | static void dvb_ca_private_put(struct dvb_ca_private *ca) |
188 | { |
189 | kref_put(kref: &ca->refcount, release: dvb_ca_private_release); |
190 | } |
191 | |
192 | static void dvb_ca_en50221_thread_wakeup(struct dvb_ca_private *ca); |
193 | static int dvb_ca_en50221_read_data(struct dvb_ca_private *ca, int slot, |
194 | u8 *ebuf, int ecount); |
195 | static int dvb_ca_en50221_write_data(struct dvb_ca_private *ca, int slot, |
196 | u8 *ebuf, int ecount, int size_write_flag); |
197 | |
198 | /** |
199 | * findstr - 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 | /* EN50221 physical interface functions */ |
224 | |
225 | /* |
226 | * dvb_ca_en50221_check_camstatus - Check CAM status. |
227 | */ |
228 | static int dvb_ca_en50221_check_camstatus(struct dvb_ca_private *ca, int slot) |
229 | { |
230 | struct dvb_ca_slot *sl = &ca->slot_info[slot]; |
231 | int slot_status; |
232 | int cam_present_now; |
233 | int cam_changed; |
234 | |
235 | /* IRQ mode */ |
236 | if (ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE) |
237 | return (atomic_read(v: &sl->camchange_count) != 0); |
238 | |
239 | /* poll mode */ |
240 | slot_status = ca->pub->poll_slot_status(ca->pub, slot, ca->open); |
241 | |
242 | cam_present_now = (slot_status & DVB_CA_EN50221_POLL_CAM_PRESENT) ? 1 : 0; |
243 | cam_changed = (slot_status & DVB_CA_EN50221_POLL_CAM_CHANGED) ? 1 : 0; |
244 | if (!cam_changed) { |
245 | int cam_present_old = (sl->slot_state != DVB_CA_SLOTSTATE_NONE); |
246 | |
247 | cam_changed = (cam_present_now != cam_present_old); |
248 | } |
249 | |
250 | if (cam_changed) { |
251 | if (!cam_present_now) |
252 | sl->camchange_type = DVB_CA_EN50221_CAMCHANGE_REMOVED; |
253 | else |
254 | sl->camchange_type = DVB_CA_EN50221_CAMCHANGE_INSERTED; |
255 | atomic_set(v: &sl->camchange_count, i: 1); |
256 | } else { |
257 | if ((sl->slot_state == DVB_CA_SLOTSTATE_WAITREADY) && |
258 | (slot_status & DVB_CA_EN50221_POLL_CAM_READY)) { |
259 | /* move to validate state if reset is completed */ |
260 | sl->slot_state = DVB_CA_SLOTSTATE_VALIDATE; |
261 | } |
262 | } |
263 | |
264 | return cam_changed; |
265 | } |
266 | |
267 | /** |
268 | * dvb_ca_en50221_wait_if_status - Wait for flags to become set on the STATUS |
269 | * register on a CAM interface, checking for errors and timeout. |
270 | * |
271 | * @ca: CA instance. |
272 | * @slot: Slot on interface. |
273 | * @waitfor: Flags to wait for. |
274 | * @timeout_hz: Timeout in milliseconds. |
275 | * |
276 | * return: 0 on success, nonzero on error. |
277 | */ |
278 | static int dvb_ca_en50221_wait_if_status(struct dvb_ca_private *ca, int slot, |
279 | u8 waitfor, int timeout_hz) |
280 | { |
281 | unsigned long timeout; |
282 | unsigned long start; |
283 | |
284 | dprintk("%s\n" , __func__); |
285 | |
286 | /* loop until timeout elapsed */ |
287 | start = jiffies; |
288 | timeout = jiffies + timeout_hz; |
289 | while (1) { |
290 | int res; |
291 | |
292 | /* read the status and check for error */ |
293 | res = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS); |
294 | if (res < 0) |
295 | return -EIO; |
296 | |
297 | /* if we got the flags, it was successful! */ |
298 | if (res & waitfor) { |
299 | dprintk("%s succeeded timeout:%lu\n" , |
300 | __func__, jiffies - start); |
301 | return 0; |
302 | } |
303 | |
304 | /* check for timeout */ |
305 | if (time_after(jiffies, timeout)) |
306 | break; |
307 | |
308 | /* wait for a bit */ |
309 | usleep_range(min: 1000, max: 1100); |
310 | } |
311 | |
312 | dprintk("%s failed timeout:%lu\n" , __func__, jiffies - start); |
313 | |
314 | /* if we get here, we've timed out */ |
315 | return -ETIMEDOUT; |
316 | } |
317 | |
318 | /** |
319 | * dvb_ca_en50221_link_init - Initialise the link layer connection to a CAM. |
320 | * |
321 | * @ca: CA instance. |
322 | * @slot: Slot id. |
323 | * |
324 | * return: 0 on success, nonzero on failure. |
325 | */ |
326 | static int dvb_ca_en50221_link_init(struct dvb_ca_private *ca, int slot) |
327 | { |
328 | struct dvb_ca_slot *sl = &ca->slot_info[slot]; |
329 | int ret; |
330 | int buf_size; |
331 | u8 buf[2]; |
332 | |
333 | dprintk("%s\n" , __func__); |
334 | |
335 | /* we'll be determining these during this function */ |
336 | sl->da_irq_supported = 0; |
337 | |
338 | /* |
339 | * set the host link buffer size temporarily. it will be overwritten |
340 | * with the real negotiated size later. |
341 | */ |
342 | sl->link_buf_size = 2; |
343 | |
344 | /* read the buffer size from the CAM */ |
345 | ret = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, |
346 | IRQEN | CMDREG_SR); |
347 | if (ret) |
348 | return ret; |
349 | ret = dvb_ca_en50221_wait_if_status(ca, slot, STATUSREG_DA, HZ); |
350 | if (ret) |
351 | return ret; |
352 | ret = dvb_ca_en50221_read_data(ca, slot, ebuf: buf, ecount: 2); |
353 | if (ret != 2) |
354 | return -EIO; |
355 | ret = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, IRQEN); |
356 | if (ret) |
357 | return ret; |
358 | |
359 | /* |
360 | * store it, and choose the minimum of our buffer and the CAM's buffer |
361 | * size |
362 | */ |
363 | buf_size = (buf[0] << 8) | buf[1]; |
364 | if (buf_size > HOST_LINK_BUF_SIZE) |
365 | buf_size = HOST_LINK_BUF_SIZE; |
366 | sl->link_buf_size = buf_size; |
367 | buf[0] = buf_size >> 8; |
368 | buf[1] = buf_size & 0xff; |
369 | dprintk("Chosen link buffer size of %i\n" , buf_size); |
370 | |
371 | /* write the buffer size to the CAM */ |
372 | ret = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, |
373 | IRQEN | CMDREG_SW); |
374 | if (ret) |
375 | return ret; |
376 | ret = dvb_ca_en50221_wait_if_status(ca, slot, STATUSREG_FR, HZ / 10); |
377 | if (ret) |
378 | return ret; |
379 | ret = dvb_ca_en50221_write_data(ca, slot, ebuf: buf, ecount: 2, CMDREG_SW); |
380 | if (ret != 2) |
381 | return -EIO; |
382 | ret = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, IRQEN); |
383 | if (ret) |
384 | return ret; |
385 | |
386 | /* success */ |
387 | return 0; |
388 | } |
389 | |
390 | /** |
391 | * dvb_ca_en50221_read_tuple - Read a tuple from attribute memory. |
392 | * |
393 | * @ca: CA instance. |
394 | * @slot: Slot id. |
395 | * @address: Address to read from. Updated. |
396 | * @tuple_type: Tuple id byte. Updated. |
397 | * @tuple_length: Tuple length. Updated. |
398 | * @tuple: Dest buffer for tuple (must be 256 bytes). Updated. |
399 | * |
400 | * return: 0 on success, nonzero on error. |
401 | */ |
402 | static int dvb_ca_en50221_read_tuple(struct dvb_ca_private *ca, int slot, |
403 | int *address, int *tuple_type, |
404 | int *tuple_length, u8 *tuple) |
405 | { |
406 | int i; |
407 | int _tuple_type; |
408 | int _tuple_length; |
409 | int _address = *address; |
410 | |
411 | /* grab the next tuple length and type */ |
412 | _tuple_type = ca->pub->read_attribute_mem(ca->pub, slot, _address); |
413 | if (_tuple_type < 0) |
414 | return _tuple_type; |
415 | if (_tuple_type == 0xff) { |
416 | dprintk("END OF CHAIN TUPLE type:0x%x\n" , _tuple_type); |
417 | *address += 2; |
418 | *tuple_type = _tuple_type; |
419 | *tuple_length = 0; |
420 | return 0; |
421 | } |
422 | _tuple_length = ca->pub->read_attribute_mem(ca->pub, slot, |
423 | _address + 2); |
424 | if (_tuple_length < 0) |
425 | return _tuple_length; |
426 | _address += 4; |
427 | |
428 | dprintk("TUPLE type:0x%x length:%i\n" , _tuple_type, _tuple_length); |
429 | |
430 | /* read in the whole tuple */ |
431 | for (i = 0; i < _tuple_length; i++) { |
432 | tuple[i] = ca->pub->read_attribute_mem(ca->pub, slot, |
433 | _address + (i * 2)); |
434 | dprintk(" 0x%02x: 0x%02x %c\n" , |
435 | i, tuple[i] & 0xff, |
436 | ((tuple[i] > 31) && (tuple[i] < 127)) ? tuple[i] : '.'); |
437 | } |
438 | _address += (_tuple_length * 2); |
439 | |
440 | /* success */ |
441 | *tuple_type = _tuple_type; |
442 | *tuple_length = _tuple_length; |
443 | *address = _address; |
444 | return 0; |
445 | } |
446 | |
447 | /** |
448 | * dvb_ca_en50221_parse_attributes - Parse attribute memory of a CAM module, |
449 | * extracting Config register, and checking it is a DVB CAM module. |
450 | * |
451 | * @ca: CA instance. |
452 | * @slot: Slot id. |
453 | * |
454 | * return: 0 on success, <0 on failure. |
455 | */ |
456 | static int dvb_ca_en50221_parse_attributes(struct dvb_ca_private *ca, int slot) |
457 | { |
458 | struct dvb_ca_slot *sl; |
459 | int address = 0; |
460 | int tuple_length; |
461 | int tuple_type; |
462 | u8 tuple[257]; |
463 | char *dvb_str; |
464 | int rasz; |
465 | int status; |
466 | int got_cftableentry = 0; |
467 | int end_chain = 0; |
468 | int i; |
469 | u16 manfid = 0; |
470 | u16 devid = 0; |
471 | |
472 | /* CISTPL_DEVICE_0A */ |
473 | status = dvb_ca_en50221_read_tuple(ca, slot, address: &address, tuple_type: &tuple_type, |
474 | tuple_length: &tuple_length, tuple); |
475 | if (status < 0) |
476 | return status; |
477 | if (tuple_type != 0x1D) |
478 | return -EINVAL; |
479 | |
480 | /* CISTPL_DEVICE_0C */ |
481 | status = dvb_ca_en50221_read_tuple(ca, slot, address: &address, tuple_type: &tuple_type, |
482 | tuple_length: &tuple_length, tuple); |
483 | if (status < 0) |
484 | return status; |
485 | if (tuple_type != 0x1C) |
486 | return -EINVAL; |
487 | |
488 | /* CISTPL_VERS_1 */ |
489 | status = dvb_ca_en50221_read_tuple(ca, slot, address: &address, tuple_type: &tuple_type, |
490 | tuple_length: &tuple_length, tuple); |
491 | if (status < 0) |
492 | return status; |
493 | if (tuple_type != 0x15) |
494 | return -EINVAL; |
495 | |
496 | /* CISTPL_MANFID */ |
497 | status = dvb_ca_en50221_read_tuple(ca, slot, address: &address, tuple_type: &tuple_type, |
498 | tuple_length: &tuple_length, tuple); |
499 | if (status < 0) |
500 | return status; |
501 | if (tuple_type != 0x20) |
502 | return -EINVAL; |
503 | if (tuple_length != 4) |
504 | return -EINVAL; |
505 | manfid = (tuple[1] << 8) | tuple[0]; |
506 | devid = (tuple[3] << 8) | tuple[2]; |
507 | |
508 | /* CISTPL_CONFIG */ |
509 | status = dvb_ca_en50221_read_tuple(ca, slot, address: &address, tuple_type: &tuple_type, |
510 | tuple_length: &tuple_length, tuple); |
511 | if (status < 0) |
512 | return status; |
513 | if (tuple_type != 0x1A) |
514 | return -EINVAL; |
515 | if (tuple_length < 3) |
516 | return -EINVAL; |
517 | |
518 | /* extract the configbase */ |
519 | rasz = tuple[0] & 3; |
520 | if (tuple_length < (3 + rasz + 14)) |
521 | return -EINVAL; |
522 | sl = &ca->slot_info[slot]; |
523 | sl->config_base = 0; |
524 | for (i = 0; i < rasz + 1; i++) |
525 | sl->config_base |= (tuple[2 + i] << (8 * i)); |
526 | |
527 | /* check it contains the correct DVB string */ |
528 | dvb_str = findstr(haystack: (char *)tuple, hlen: tuple_length, needle: "DVB_CI_V" , nlen: 8); |
529 | if (!dvb_str) |
530 | return -EINVAL; |
531 | if (tuple_length < ((dvb_str - (char *)tuple) + 12)) |
532 | return -EINVAL; |
533 | |
534 | /* is it a version we support? */ |
535 | if (strncmp(dvb_str + 8, "1.00" , 4)) { |
536 | pr_err("dvb_ca adapter %d: Unsupported DVB CAM module version %c%c%c%c\n" , |
537 | ca->dvbdev->adapter->num, dvb_str[8], dvb_str[9], |
538 | dvb_str[10], dvb_str[11]); |
539 | return -EINVAL; |
540 | } |
541 | |
542 | /* process the CFTABLE_ENTRY tuples, and any after those */ |
543 | while ((!end_chain) && (address < 0x1000)) { |
544 | status = dvb_ca_en50221_read_tuple(ca, slot, address: &address, |
545 | tuple_type: &tuple_type, tuple_length: &tuple_length, |
546 | tuple); |
547 | if (status < 0) |
548 | return status; |
549 | switch (tuple_type) { |
550 | case 0x1B: /* CISTPL_CFTABLE_ENTRY */ |
551 | if (tuple_length < (2 + 11 + 17)) |
552 | break; |
553 | |
554 | /* if we've already parsed one, just use it */ |
555 | if (got_cftableentry) |
556 | break; |
557 | |
558 | /* get the config option */ |
559 | sl->config_option = tuple[0] & 0x3f; |
560 | |
561 | /* OK, check it contains the correct strings */ |
562 | if (!findstr(haystack: (char *)tuple, hlen: tuple_length, |
563 | needle: "DVB_HOST" , nlen: 8) || |
564 | !findstr(haystack: (char *)tuple, hlen: tuple_length, |
565 | needle: "DVB_CI_MODULE" , nlen: 13)) |
566 | break; |
567 | |
568 | got_cftableentry = 1; |
569 | break; |
570 | |
571 | case 0x14: /* CISTPL_NO_LINK */ |
572 | break; |
573 | |
574 | case 0xFF: /* CISTPL_END */ |
575 | end_chain = 1; |
576 | break; |
577 | |
578 | default: /* Unknown tuple type - just skip this tuple */ |
579 | dprintk("dvb_ca: Skipping unknown tuple type:0x%x length:0x%x\n" , |
580 | tuple_type, tuple_length); |
581 | break; |
582 | } |
583 | } |
584 | |
585 | if ((address > 0x1000) || (!got_cftableentry)) |
586 | return -EINVAL; |
587 | |
588 | dprintk("Valid DVB CAM detected MANID:%x DEVID:%x CONFIGBASE:0x%x CONFIGOPTION:0x%x\n" , |
589 | manfid, devid, sl->config_base, sl->config_option); |
590 | |
591 | /* success! */ |
592 | return 0; |
593 | } |
594 | |
595 | /** |
596 | * dvb_ca_en50221_set_configoption - Set CAM's configoption correctly. |
597 | * |
598 | * @ca: CA instance. |
599 | * @slot: Slot containing the CAM. |
600 | */ |
601 | static int dvb_ca_en50221_set_configoption(struct dvb_ca_private *ca, int slot) |
602 | { |
603 | struct dvb_ca_slot *sl = &ca->slot_info[slot]; |
604 | int configoption; |
605 | |
606 | dprintk("%s\n" , __func__); |
607 | |
608 | /* set the config option */ |
609 | ca->pub->write_attribute_mem(ca->pub, slot, sl->config_base, |
610 | sl->config_option); |
611 | |
612 | /* check it */ |
613 | configoption = ca->pub->read_attribute_mem(ca->pub, slot, |
614 | sl->config_base); |
615 | dprintk("Set configoption 0x%x, read configoption 0x%x\n" , |
616 | sl->config_option, configoption & 0x3f); |
617 | |
618 | /* fine! */ |
619 | return 0; |
620 | } |
621 | |
622 | /** |
623 | * dvb_ca_en50221_read_data - This function talks to an EN50221 CAM control |
624 | * interface. It reads a buffer of data from the CAM. The data can either |
625 | * be stored in a supplied buffer, or automatically be added to the slot's |
626 | * rx_buffer. |
627 | * |
628 | * @ca: CA instance. |
629 | * @slot: Slot to read from. |
630 | * @ebuf: If non-NULL, the data will be written to this buffer. If NULL, |
631 | * the data will be added into the buffering system as a normal |
632 | * fragment. |
633 | * @ecount: Size of ebuf. Ignored if ebuf is NULL. |
634 | * |
635 | * return: Number of bytes read, or < 0 on error |
636 | */ |
637 | static int dvb_ca_en50221_read_data(struct dvb_ca_private *ca, int slot, |
638 | u8 *ebuf, int ecount) |
639 | { |
640 | struct dvb_ca_slot *sl = &ca->slot_info[slot]; |
641 | int bytes_read; |
642 | int status; |
643 | u8 buf[HOST_LINK_BUF_SIZE]; |
644 | int i; |
645 | |
646 | dprintk("%s\n" , __func__); |
647 | |
648 | /* check if we have space for a link buf in the rx_buffer */ |
649 | if (!ebuf) { |
650 | int buf_free; |
651 | |
652 | if (!sl->rx_buffer.data) { |
653 | status = -EIO; |
654 | goto exit; |
655 | } |
656 | buf_free = dvb_ringbuffer_free(rbuf: &sl->rx_buffer); |
657 | |
658 | if (buf_free < (sl->link_buf_size + |
659 | DVB_RINGBUFFER_PKTHDRSIZE)) { |
660 | status = -EAGAIN; |
661 | goto exit; |
662 | } |
663 | } |
664 | |
665 | if (ca->pub->read_data && |
666 | (sl->slot_state != DVB_CA_SLOTSTATE_LINKINIT)) { |
667 | if (!ebuf) |
668 | status = ca->pub->read_data(ca->pub, slot, buf, |
669 | sizeof(buf)); |
670 | else |
671 | status = ca->pub->read_data(ca->pub, slot, buf, ecount); |
672 | if (status < 0) |
673 | return status; |
674 | bytes_read = status; |
675 | if (status == 0) |
676 | goto exit; |
677 | } else { |
678 | /* check if there is data available */ |
679 | status = ca->pub->read_cam_control(ca->pub, slot, |
680 | CTRLIF_STATUS); |
681 | if (status < 0) |
682 | goto exit; |
683 | if (!(status & STATUSREG_DA)) { |
684 | /* no data */ |
685 | status = 0; |
686 | goto exit; |
687 | } |
688 | |
689 | /* read the amount of data */ |
690 | status = ca->pub->read_cam_control(ca->pub, slot, |
691 | CTRLIF_SIZE_HIGH); |
692 | if (status < 0) |
693 | goto exit; |
694 | bytes_read = status << 8; |
695 | status = ca->pub->read_cam_control(ca->pub, slot, |
696 | CTRLIF_SIZE_LOW); |
697 | if (status < 0) |
698 | goto exit; |
699 | bytes_read |= status; |
700 | |
701 | /* check it will fit */ |
702 | if (!ebuf) { |
703 | if (bytes_read > sl->link_buf_size) { |
704 | pr_err("dvb_ca adapter %d: CAM tried to send a buffer larger than the link buffer size (%i > %i)!\n" , |
705 | ca->dvbdev->adapter->num, bytes_read, |
706 | sl->link_buf_size); |
707 | sl->slot_state = DVB_CA_SLOTSTATE_LINKINIT; |
708 | status = -EIO; |
709 | goto exit; |
710 | } |
711 | if (bytes_read < 2) { |
712 | pr_err("dvb_ca adapter %d: CAM sent a buffer that was less than 2 bytes!\n" , |
713 | ca->dvbdev->adapter->num); |
714 | sl->slot_state = DVB_CA_SLOTSTATE_LINKINIT; |
715 | status = -EIO; |
716 | goto exit; |
717 | } |
718 | } else { |
719 | if (bytes_read > ecount) { |
720 | pr_err("dvb_ca adapter %d: CAM tried to send a buffer larger than the ecount size!\n" , |
721 | ca->dvbdev->adapter->num); |
722 | status = -EIO; |
723 | goto exit; |
724 | } |
725 | } |
726 | |
727 | /* fill the buffer */ |
728 | for (i = 0; i < bytes_read; i++) { |
729 | /* read byte and check */ |
730 | status = ca->pub->read_cam_control(ca->pub, slot, |
731 | CTRLIF_DATA); |
732 | if (status < 0) |
733 | goto exit; |
734 | |
735 | /* OK, store it in the buffer */ |
736 | buf[i] = status; |
737 | } |
738 | |
739 | /* check for read error (RE should now be 0) */ |
740 | status = ca->pub->read_cam_control(ca->pub, slot, |
741 | CTRLIF_STATUS); |
742 | if (status < 0) |
743 | goto exit; |
744 | if (status & STATUSREG_RE) { |
745 | sl->slot_state = DVB_CA_SLOTSTATE_LINKINIT; |
746 | status = -EIO; |
747 | goto exit; |
748 | } |
749 | } |
750 | |
751 | /* |
752 | * OK, add it to the receive buffer, or copy into external buffer if |
753 | * supplied |
754 | */ |
755 | if (!ebuf) { |
756 | if (!sl->rx_buffer.data) { |
757 | status = -EIO; |
758 | goto exit; |
759 | } |
760 | dvb_ringbuffer_pkt_write(rbuf: &sl->rx_buffer, buf, len: bytes_read); |
761 | } else { |
762 | memcpy(ebuf, buf, bytes_read); |
763 | } |
764 | |
765 | dprintk("Received CA packet for slot %i connection id 0x%x last_frag:%i size:0x%x\n" , slot, |
766 | buf[0], (buf[1] & 0x80) == 0, bytes_read); |
767 | |
768 | /* wake up readers when a last_fragment is received */ |
769 | if ((buf[1] & 0x80) == 0x00) |
770 | wake_up_interruptible(&ca->wait_queue); |
771 | |
772 | status = bytes_read; |
773 | |
774 | exit: |
775 | return status; |
776 | } |
777 | |
778 | /** |
779 | * dvb_ca_en50221_write_data - This function talks to an EN50221 CAM control |
780 | * interface. It writes a buffer of data to a CAM. |
781 | * |
782 | * @ca: CA instance. |
783 | * @slot: Slot to write to. |
784 | * @buf: The data in this buffer is treated as a complete link-level packet to |
785 | * be written. |
786 | * @bytes_write: Size of ebuf. |
787 | * @size_write_flag: A flag on Command Register which says whether the link size |
788 | * information will be writen or not. |
789 | * |
790 | * return: Number of bytes written, or < 0 on error. |
791 | */ |
792 | static int dvb_ca_en50221_write_data(struct dvb_ca_private *ca, int slot, |
793 | u8 *buf, int bytes_write, int size_write_flag) |
794 | { |
795 | struct dvb_ca_slot *sl = &ca->slot_info[slot]; |
796 | int status; |
797 | int i; |
798 | |
799 | dprintk("%s\n" , __func__); |
800 | |
801 | /* sanity check */ |
802 | if (bytes_write > sl->link_buf_size) |
803 | return -EINVAL; |
804 | |
805 | if (ca->pub->write_data && |
806 | (sl->slot_state != DVB_CA_SLOTSTATE_LINKINIT)) |
807 | return ca->pub->write_data(ca->pub, slot, buf, bytes_write); |
808 | |
809 | /* |
810 | * it is possible we are dealing with a single buffer implementation, |
811 | * thus if there is data available for read or if there is even a read |
812 | * already in progress, we do nothing but awake the kernel thread to |
813 | * process the data if necessary. |
814 | */ |
815 | status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS); |
816 | if (status < 0) |
817 | goto exitnowrite; |
818 | if (status & (STATUSREG_DA | STATUSREG_RE)) { |
819 | if (status & STATUSREG_DA) |
820 | dvb_ca_en50221_thread_wakeup(ca); |
821 | |
822 | status = -EAGAIN; |
823 | goto exitnowrite; |
824 | } |
825 | |
826 | /* OK, set HC bit */ |
827 | status = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, |
828 | IRQEN | CMDREG_HC | size_write_flag); |
829 | if (status) |
830 | goto exit; |
831 | |
832 | /* check if interface is still free */ |
833 | status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS); |
834 | if (status < 0) |
835 | goto exit; |
836 | if (!(status & STATUSREG_FR)) { |
837 | /* it wasn't free => try again later */ |
838 | status = -EAGAIN; |
839 | goto exit; |
840 | } |
841 | |
842 | /* |
843 | * It may need some time for the CAM to settle down, or there might |
844 | * be a race condition between the CAM, writing HC and our last |
845 | * check for DA. This happens, if the CAM asserts DA, just after |
846 | * checking DA before we are setting HC. In this case it might be |
847 | * a bug in the CAM to keep the FR bit, the lower layer/HW |
848 | * communication requires a longer timeout or the CAM needs more |
849 | * time internally. But this happens in reality! |
850 | * We need to read the status from the HW again and do the same |
851 | * we did for the previous check for DA |
852 | */ |
853 | status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS); |
854 | if (status < 0) |
855 | goto exit; |
856 | |
857 | if (status & (STATUSREG_DA | STATUSREG_RE)) { |
858 | if (status & STATUSREG_DA) |
859 | dvb_ca_en50221_thread_wakeup(ca); |
860 | |
861 | status = -EAGAIN; |
862 | goto exit; |
863 | } |
864 | |
865 | /* send the amount of data */ |
866 | status = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_SIZE_HIGH, |
867 | bytes_write >> 8); |
868 | if (status) |
869 | goto exit; |
870 | status = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_SIZE_LOW, |
871 | bytes_write & 0xff); |
872 | if (status) |
873 | goto exit; |
874 | |
875 | /* send the buffer */ |
876 | for (i = 0; i < bytes_write; i++) { |
877 | status = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_DATA, |
878 | buf[i]); |
879 | if (status) |
880 | goto exit; |
881 | } |
882 | |
883 | /* check for write error (WE should now be 0) */ |
884 | status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS); |
885 | if (status < 0) |
886 | goto exit; |
887 | if (status & STATUSREG_WE) { |
888 | sl->slot_state = DVB_CA_SLOTSTATE_LINKINIT; |
889 | status = -EIO; |
890 | goto exit; |
891 | } |
892 | status = bytes_write; |
893 | |
894 | dprintk("Wrote CA packet for slot %i, connection id 0x%x last_frag:%i size:0x%x\n" , slot, |
895 | buf[0], (buf[1] & 0x80) == 0, bytes_write); |
896 | |
897 | exit: |
898 | ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, IRQEN); |
899 | |
900 | exitnowrite: |
901 | return status; |
902 | } |
903 | |
904 | /* ************************************************************************** */ |
905 | /* EN50221 higher level functions */ |
906 | |
907 | /** |
908 | * dvb_ca_en50221_slot_shutdown - A CAM has been removed => shut it down. |
909 | * |
910 | * @ca: CA instance. |
911 | * @slot: Slot to shut down. |
912 | */ |
913 | static int dvb_ca_en50221_slot_shutdown(struct dvb_ca_private *ca, int slot) |
914 | { |
915 | dprintk("%s\n" , __func__); |
916 | |
917 | ca->pub->slot_shutdown(ca->pub, slot); |
918 | ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_NONE; |
919 | |
920 | /* |
921 | * need to wake up all processes to check if they're now trying to |
922 | * write to a defunct CAM |
923 | */ |
924 | wake_up_interruptible(&ca->wait_queue); |
925 | |
926 | dprintk("Slot %i shutdown\n" , slot); |
927 | |
928 | /* success */ |
929 | return 0; |
930 | } |
931 | |
932 | /** |
933 | * dvb_ca_en50221_camchange_irq - A CAMCHANGE IRQ has occurred. |
934 | * |
935 | * @pubca: CA instance. |
936 | * @slot: Slot concerned. |
937 | * @change_type: One of the DVB_CA_CAMCHANGE_* values. |
938 | */ |
939 | void dvb_ca_en50221_camchange_irq(struct dvb_ca_en50221 *pubca, int slot, |
940 | int change_type) |
941 | { |
942 | struct dvb_ca_private *ca = pubca->private; |
943 | struct dvb_ca_slot *sl = &ca->slot_info[slot]; |
944 | |
945 | dprintk("CAMCHANGE IRQ slot:%i change_type:%i\n" , slot, change_type); |
946 | |
947 | switch (change_type) { |
948 | case DVB_CA_EN50221_CAMCHANGE_REMOVED: |
949 | case DVB_CA_EN50221_CAMCHANGE_INSERTED: |
950 | break; |
951 | |
952 | default: |
953 | return; |
954 | } |
955 | |
956 | sl->camchange_type = change_type; |
957 | atomic_inc(v: &sl->camchange_count); |
958 | dvb_ca_en50221_thread_wakeup(ca); |
959 | } |
960 | EXPORT_SYMBOL(dvb_ca_en50221_camchange_irq); |
961 | |
962 | /** |
963 | * dvb_ca_en50221_camready_irq - A CAMREADY IRQ has occurred. |
964 | * |
965 | * @pubca: CA instance. |
966 | * @slot: Slot concerned. |
967 | */ |
968 | void dvb_ca_en50221_camready_irq(struct dvb_ca_en50221 *pubca, int slot) |
969 | { |
970 | struct dvb_ca_private *ca = pubca->private; |
971 | struct dvb_ca_slot *sl = &ca->slot_info[slot]; |
972 | |
973 | dprintk("CAMREADY IRQ slot:%i\n" , slot); |
974 | |
975 | if (sl->slot_state == DVB_CA_SLOTSTATE_WAITREADY) { |
976 | sl->slot_state = DVB_CA_SLOTSTATE_VALIDATE; |
977 | dvb_ca_en50221_thread_wakeup(ca); |
978 | } |
979 | } |
980 | EXPORT_SYMBOL(dvb_ca_en50221_camready_irq); |
981 | |
982 | /** |
983 | * dvb_ca_en50221_frda_irq - An FR or DA IRQ has occurred. |
984 | * |
985 | * @pubca: CA instance. |
986 | * @slot: Slot concerned. |
987 | */ |
988 | void dvb_ca_en50221_frda_irq(struct dvb_ca_en50221 *pubca, int slot) |
989 | { |
990 | struct dvb_ca_private *ca = pubca->private; |
991 | struct dvb_ca_slot *sl = &ca->slot_info[slot]; |
992 | int flags; |
993 | |
994 | dprintk("FR/DA IRQ slot:%i\n" , slot); |
995 | |
996 | switch (sl->slot_state) { |
997 | case DVB_CA_SLOTSTATE_LINKINIT: |
998 | flags = ca->pub->read_cam_control(pubca, slot, CTRLIF_STATUS); |
999 | if (flags & STATUSREG_DA) { |
1000 | dprintk("CAM supports DA IRQ\n" ); |
1001 | sl->da_irq_supported = 1; |
1002 | } |
1003 | break; |
1004 | |
1005 | case DVB_CA_SLOTSTATE_RUNNING: |
1006 | if (ca->open) |
1007 | dvb_ca_en50221_thread_wakeup(ca); |
1008 | break; |
1009 | } |
1010 | } |
1011 | EXPORT_SYMBOL(dvb_ca_en50221_frda_irq); |
1012 | |
1013 | /* ************************************************************************** */ |
1014 | /* EN50221 thread functions */ |
1015 | |
1016 | /** |
1017 | * dvb_ca_en50221_thread_wakeup - Wake up the DVB CA thread |
1018 | * |
1019 | * @ca: CA instance. |
1020 | */ |
1021 | static void dvb_ca_en50221_thread_wakeup(struct dvb_ca_private *ca) |
1022 | { |
1023 | dprintk("%s\n" , __func__); |
1024 | |
1025 | ca->wakeup = 1; |
1026 | mb(); |
1027 | wake_up_process(tsk: ca->thread); |
1028 | } |
1029 | |
1030 | /** |
1031 | * dvb_ca_en50221_thread_update_delay - Update the delay used by the thread. |
1032 | * |
1033 | * @ca: CA instance. |
1034 | */ |
1035 | static void dvb_ca_en50221_thread_update_delay(struct dvb_ca_private *ca) |
1036 | { |
1037 | int delay; |
1038 | int curdelay = 100000000; |
1039 | int slot; |
1040 | |
1041 | /* |
1042 | * Beware of too high polling frequency, because one polling |
1043 | * call might take several hundred milliseconds until timeout! |
1044 | */ |
1045 | for (slot = 0; slot < ca->slot_count; slot++) { |
1046 | struct dvb_ca_slot *sl = &ca->slot_info[slot]; |
1047 | |
1048 | switch (sl->slot_state) { |
1049 | default: |
1050 | case DVB_CA_SLOTSTATE_NONE: |
1051 | delay = HZ * 60; /* 60s */ |
1052 | if (!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE)) |
1053 | delay = HZ * 5; /* 5s */ |
1054 | break; |
1055 | case DVB_CA_SLOTSTATE_INVALID: |
1056 | delay = HZ * 60; /* 60s */ |
1057 | if (!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE)) |
1058 | delay = HZ / 10; /* 100ms */ |
1059 | break; |
1060 | |
1061 | case DVB_CA_SLOTSTATE_UNINITIALISED: |
1062 | case DVB_CA_SLOTSTATE_WAITREADY: |
1063 | case DVB_CA_SLOTSTATE_VALIDATE: |
1064 | case DVB_CA_SLOTSTATE_WAITFR: |
1065 | case DVB_CA_SLOTSTATE_LINKINIT: |
1066 | delay = HZ / 10; /* 100ms */ |
1067 | break; |
1068 | |
1069 | case DVB_CA_SLOTSTATE_RUNNING: |
1070 | delay = HZ * 60; /* 60s */ |
1071 | if (!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE)) |
1072 | delay = HZ / 10; /* 100ms */ |
1073 | if (ca->open) { |
1074 | if ((!sl->da_irq_supported) || |
1075 | (!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_DA))) |
1076 | delay = HZ / 10; /* 100ms */ |
1077 | } |
1078 | break; |
1079 | } |
1080 | |
1081 | if (delay < curdelay) |
1082 | curdelay = delay; |
1083 | } |
1084 | |
1085 | ca->delay = curdelay; |
1086 | } |
1087 | |
1088 | /** |
1089 | * dvb_ca_en50221_poll_cam_gone - Poll if the CAM is gone. |
1090 | * |
1091 | * @ca: CA instance. |
1092 | * @slot: Slot to process. |
1093 | * return:: 0 .. no change |
1094 | * 1 .. CAM state changed |
1095 | */ |
1096 | |
1097 | static int dvb_ca_en50221_poll_cam_gone(struct dvb_ca_private *ca, int slot) |
1098 | { |
1099 | int changed = 0; |
1100 | int status; |
1101 | |
1102 | /* |
1103 | * we need this extra check for annoying interfaces like the |
1104 | * budget-av |
1105 | */ |
1106 | if ((!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE)) && |
1107 | (ca->pub->poll_slot_status)) { |
1108 | status = ca->pub->poll_slot_status(ca->pub, slot, 0); |
1109 | if (!(status & |
1110 | DVB_CA_EN50221_POLL_CAM_PRESENT)) { |
1111 | ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_NONE; |
1112 | dvb_ca_en50221_thread_update_delay(ca); |
1113 | changed = 1; |
1114 | } |
1115 | } |
1116 | return changed; |
1117 | } |
1118 | |
1119 | /** |
1120 | * dvb_ca_en50221_thread_state_machine - Thread state machine for one CA slot |
1121 | * to perform the data transfer. |
1122 | * |
1123 | * @ca: CA instance. |
1124 | * @slot: Slot to process. |
1125 | */ |
1126 | static void dvb_ca_en50221_thread_state_machine(struct dvb_ca_private *ca, |
1127 | int slot) |
1128 | { |
1129 | struct dvb_ca_slot *sl = &ca->slot_info[slot]; |
1130 | int flags; |
1131 | int pktcount; |
1132 | void *rxbuf; |
1133 | |
1134 | mutex_lock(&sl->slot_lock); |
1135 | |
1136 | /* check the cam status + deal with CAMCHANGEs */ |
1137 | while (dvb_ca_en50221_check_camstatus(ca, slot)) { |
1138 | /* clear down an old CI slot if necessary */ |
1139 | if (sl->slot_state != DVB_CA_SLOTSTATE_NONE) |
1140 | dvb_ca_en50221_slot_shutdown(ca, slot); |
1141 | |
1142 | /* if a CAM is NOW present, initialise it */ |
1143 | if (sl->camchange_type == DVB_CA_EN50221_CAMCHANGE_INSERTED) |
1144 | sl->slot_state = DVB_CA_SLOTSTATE_UNINITIALISED; |
1145 | |
1146 | /* we've handled one CAMCHANGE */ |
1147 | dvb_ca_en50221_thread_update_delay(ca); |
1148 | atomic_dec(v: &sl->camchange_count); |
1149 | } |
1150 | |
1151 | /* CAM state machine */ |
1152 | switch (sl->slot_state) { |
1153 | case DVB_CA_SLOTSTATE_NONE: |
1154 | case DVB_CA_SLOTSTATE_INVALID: |
1155 | /* no action needed */ |
1156 | break; |
1157 | |
1158 | case DVB_CA_SLOTSTATE_UNINITIALISED: |
1159 | sl->slot_state = DVB_CA_SLOTSTATE_WAITREADY; |
1160 | ca->pub->slot_reset(ca->pub, slot); |
1161 | sl->timeout = jiffies + (INIT_TIMEOUT_SECS * HZ); |
1162 | break; |
1163 | |
1164 | case DVB_CA_SLOTSTATE_WAITREADY: |
1165 | if (time_after(jiffies, sl->timeout)) { |
1166 | pr_err("dvb_ca adaptor %d: PC card did not respond :(\n" , |
1167 | ca->dvbdev->adapter->num); |
1168 | sl->slot_state = DVB_CA_SLOTSTATE_INVALID; |
1169 | dvb_ca_en50221_thread_update_delay(ca); |
1170 | break; |
1171 | } |
1172 | /* |
1173 | * no other action needed; will automatically change state when |
1174 | * ready |
1175 | */ |
1176 | break; |
1177 | |
1178 | case DVB_CA_SLOTSTATE_VALIDATE: |
1179 | if (dvb_ca_en50221_parse_attributes(ca, slot) != 0) { |
1180 | if (dvb_ca_en50221_poll_cam_gone(ca, slot)) |
1181 | break; |
1182 | |
1183 | pr_err("dvb_ca adapter %d: Invalid PC card inserted :(\n" , |
1184 | ca->dvbdev->adapter->num); |
1185 | sl->slot_state = DVB_CA_SLOTSTATE_INVALID; |
1186 | dvb_ca_en50221_thread_update_delay(ca); |
1187 | break; |
1188 | } |
1189 | if (dvb_ca_en50221_set_configoption(ca, slot) != 0) { |
1190 | pr_err("dvb_ca adapter %d: Unable to initialise CAM :(\n" , |
1191 | ca->dvbdev->adapter->num); |
1192 | sl->slot_state = DVB_CA_SLOTSTATE_INVALID; |
1193 | dvb_ca_en50221_thread_update_delay(ca); |
1194 | break; |
1195 | } |
1196 | if (ca->pub->write_cam_control(ca->pub, slot, |
1197 | CTRLIF_COMMAND, |
1198 | CMDREG_RS) != 0) { |
1199 | pr_err("dvb_ca adapter %d: Unable to reset CAM IF\n" , |
1200 | ca->dvbdev->adapter->num); |
1201 | sl->slot_state = DVB_CA_SLOTSTATE_INVALID; |
1202 | dvb_ca_en50221_thread_update_delay(ca); |
1203 | break; |
1204 | } |
1205 | dprintk("DVB CAM validated successfully\n" ); |
1206 | |
1207 | sl->timeout = jiffies + (INIT_TIMEOUT_SECS * HZ); |
1208 | sl->slot_state = DVB_CA_SLOTSTATE_WAITFR; |
1209 | ca->wakeup = 1; |
1210 | break; |
1211 | |
1212 | case DVB_CA_SLOTSTATE_WAITFR: |
1213 | if (time_after(jiffies, sl->timeout)) { |
1214 | pr_err("dvb_ca adapter %d: DVB CAM did not respond :(\n" , |
1215 | ca->dvbdev->adapter->num); |
1216 | sl->slot_state = DVB_CA_SLOTSTATE_INVALID; |
1217 | dvb_ca_en50221_thread_update_delay(ca); |
1218 | break; |
1219 | } |
1220 | |
1221 | flags = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS); |
1222 | if (flags & STATUSREG_FR) { |
1223 | sl->slot_state = DVB_CA_SLOTSTATE_LINKINIT; |
1224 | ca->wakeup = 1; |
1225 | } |
1226 | break; |
1227 | |
1228 | case DVB_CA_SLOTSTATE_LINKINIT: |
1229 | if (dvb_ca_en50221_link_init(ca, slot) != 0) { |
1230 | if (dvb_ca_en50221_poll_cam_gone(ca, slot)) |
1231 | break; |
1232 | |
1233 | pr_err("dvb_ca adapter %d: DVB CAM link initialisation failed :(\n" , |
1234 | ca->dvbdev->adapter->num); |
1235 | sl->slot_state = DVB_CA_SLOTSTATE_UNINITIALISED; |
1236 | dvb_ca_en50221_thread_update_delay(ca); |
1237 | break; |
1238 | } |
1239 | |
1240 | if (!sl->rx_buffer.data) { |
1241 | rxbuf = vmalloc(RX_BUFFER_SIZE); |
1242 | if (!rxbuf) { |
1243 | pr_err("dvb_ca adapter %d: Unable to allocate CAM rx buffer :(\n" , |
1244 | ca->dvbdev->adapter->num); |
1245 | sl->slot_state = DVB_CA_SLOTSTATE_INVALID; |
1246 | dvb_ca_en50221_thread_update_delay(ca); |
1247 | break; |
1248 | } |
1249 | dvb_ringbuffer_init(rbuf: &sl->rx_buffer, data: rxbuf, |
1250 | RX_BUFFER_SIZE); |
1251 | } |
1252 | |
1253 | ca->pub->slot_ts_enable(ca->pub, slot); |
1254 | sl->slot_state = DVB_CA_SLOTSTATE_RUNNING; |
1255 | dvb_ca_en50221_thread_update_delay(ca); |
1256 | pr_info("dvb_ca adapter %d: DVB CAM detected and initialised successfully\n" , |
1257 | ca->dvbdev->adapter->num); |
1258 | break; |
1259 | |
1260 | case DVB_CA_SLOTSTATE_RUNNING: |
1261 | if (!ca->open) |
1262 | break; |
1263 | |
1264 | /* poll slots for data */ |
1265 | pktcount = 0; |
1266 | while (dvb_ca_en50221_read_data(ca, slot, NULL, ecount: 0) > 0) { |
1267 | if (!ca->open) |
1268 | break; |
1269 | |
1270 | /* |
1271 | * if a CAMCHANGE occurred at some point, do not do any |
1272 | * more processing of this slot |
1273 | */ |
1274 | if (dvb_ca_en50221_check_camstatus(ca, slot)) { |
1275 | /* |
1276 | * we don't want to sleep on the next iteration |
1277 | * so we can handle the cam change |
1278 | */ |
1279 | ca->wakeup = 1; |
1280 | break; |
1281 | } |
1282 | |
1283 | /* check if we've hit our limit this time */ |
1284 | if (++pktcount >= MAX_RX_PACKETS_PER_ITERATION) { |
1285 | /* |
1286 | * don't sleep; there is likely to be more data |
1287 | * to read |
1288 | */ |
1289 | ca->wakeup = 1; |
1290 | break; |
1291 | } |
1292 | } |
1293 | break; |
1294 | } |
1295 | |
1296 | mutex_unlock(lock: &sl->slot_lock); |
1297 | } |
1298 | |
1299 | /* |
1300 | * Kernel thread which monitors CA slots for CAM changes, and performs data |
1301 | * transfers. |
1302 | */ |
1303 | static int dvb_ca_en50221_thread(void *data) |
1304 | { |
1305 | struct dvb_ca_private *ca = data; |
1306 | int slot; |
1307 | |
1308 | dprintk("%s\n" , __func__); |
1309 | |
1310 | /* choose the correct initial delay */ |
1311 | dvb_ca_en50221_thread_update_delay(ca); |
1312 | |
1313 | /* main loop */ |
1314 | while (!kthread_should_stop()) { |
1315 | /* sleep for a bit */ |
1316 | if (!ca->wakeup) { |
1317 | set_current_state(TASK_INTERRUPTIBLE); |
1318 | schedule_timeout(timeout: ca->delay); |
1319 | if (kthread_should_stop()) |
1320 | return 0; |
1321 | } |
1322 | ca->wakeup = 0; |
1323 | |
1324 | /* go through all the slots processing them */ |
1325 | for (slot = 0; slot < ca->slot_count; slot++) |
1326 | dvb_ca_en50221_thread_state_machine(ca, slot); |
1327 | } |
1328 | |
1329 | return 0; |
1330 | } |
1331 | |
1332 | /* ************************************************************************** */ |
1333 | /* EN50221 IO interface functions */ |
1334 | |
1335 | /** |
1336 | * dvb_ca_en50221_io_do_ioctl - Real ioctl implementation. |
1337 | * |
1338 | * @file: File concerned. |
1339 | * @cmd: IOCTL command. |
1340 | * @parg: Associated argument. |
1341 | * |
1342 | * NOTE: CA_SEND_MSG/CA_GET_MSG ioctls have userspace buffers passed to them. |
1343 | * |
1344 | * return: 0 on success, <0 on error. |
1345 | */ |
1346 | static int dvb_ca_en50221_io_do_ioctl(struct file *file, |
1347 | unsigned int cmd, void *parg) |
1348 | { |
1349 | struct dvb_device *dvbdev = file->private_data; |
1350 | struct dvb_ca_private *ca = dvbdev->priv; |
1351 | int err = 0; |
1352 | int slot; |
1353 | |
1354 | dprintk("%s\n" , __func__); |
1355 | |
1356 | if (mutex_lock_interruptible(&ca->ioctl_mutex)) |
1357 | return -ERESTARTSYS; |
1358 | |
1359 | switch (cmd) { |
1360 | case CA_RESET: |
1361 | for (slot = 0; slot < ca->slot_count; slot++) { |
1362 | struct dvb_ca_slot *sl = &ca->slot_info[slot]; |
1363 | |
1364 | mutex_lock(&sl->slot_lock); |
1365 | if (sl->slot_state != DVB_CA_SLOTSTATE_NONE) { |
1366 | dvb_ca_en50221_slot_shutdown(ca, slot); |
1367 | if (ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE) |
1368 | dvb_ca_en50221_camchange_irq(ca->pub, |
1369 | slot, |
1370 | DVB_CA_EN50221_CAMCHANGE_INSERTED); |
1371 | } |
1372 | mutex_unlock(lock: &sl->slot_lock); |
1373 | } |
1374 | ca->next_read_slot = 0; |
1375 | dvb_ca_en50221_thread_wakeup(ca); |
1376 | break; |
1377 | |
1378 | case CA_GET_CAP: { |
1379 | struct ca_caps *caps = parg; |
1380 | |
1381 | caps->slot_num = ca->slot_count; |
1382 | caps->slot_type = CA_CI_LINK; |
1383 | caps->descr_num = 0; |
1384 | caps->descr_type = 0; |
1385 | break; |
1386 | } |
1387 | |
1388 | case CA_GET_SLOT_INFO: { |
1389 | struct ca_slot_info *info = parg; |
1390 | struct dvb_ca_slot *sl; |
1391 | |
1392 | slot = info->num; |
1393 | if ((slot >= ca->slot_count) || (slot < 0)) { |
1394 | err = -EINVAL; |
1395 | goto out_unlock; |
1396 | } |
1397 | slot = array_index_nospec(slot, ca->slot_count); |
1398 | |
1399 | info->type = CA_CI_LINK; |
1400 | info->flags = 0; |
1401 | sl = &ca->slot_info[slot]; |
1402 | if ((sl->slot_state != DVB_CA_SLOTSTATE_NONE) && |
1403 | (sl->slot_state != DVB_CA_SLOTSTATE_INVALID)) { |
1404 | info->flags = CA_CI_MODULE_PRESENT; |
1405 | } |
1406 | if (sl->slot_state == DVB_CA_SLOTSTATE_RUNNING) |
1407 | info->flags |= CA_CI_MODULE_READY; |
1408 | break; |
1409 | } |
1410 | |
1411 | default: |
1412 | err = -EINVAL; |
1413 | break; |
1414 | } |
1415 | |
1416 | out_unlock: |
1417 | mutex_unlock(lock: &ca->ioctl_mutex); |
1418 | return err; |
1419 | } |
1420 | |
1421 | /** |
1422 | * dvb_ca_en50221_io_ioctl - Wrapper for ioctl implementation. |
1423 | * |
1424 | * @file: File concerned. |
1425 | * @cmd: IOCTL command. |
1426 | * @arg: Associated argument. |
1427 | * |
1428 | * return: 0 on success, <0 on error. |
1429 | */ |
1430 | static long dvb_ca_en50221_io_ioctl(struct file *file, |
1431 | unsigned int cmd, unsigned long arg) |
1432 | { |
1433 | return dvb_usercopy(file, cmd, arg, func: dvb_ca_en50221_io_do_ioctl); |
1434 | } |
1435 | |
1436 | /** |
1437 | * dvb_ca_en50221_io_write - Implementation of write() syscall. |
1438 | * |
1439 | * @file: File structure. |
1440 | * @buf: Source buffer. |
1441 | * @count: Size of source buffer. |
1442 | * @ppos: Position in file (ignored). |
1443 | * |
1444 | * return: Number of bytes read, or <0 on error. |
1445 | */ |
1446 | static ssize_t dvb_ca_en50221_io_write(struct file *file, |
1447 | const char __user *buf, size_t count, |
1448 | loff_t *ppos) |
1449 | { |
1450 | struct dvb_device *dvbdev = file->private_data; |
1451 | struct dvb_ca_private *ca = dvbdev->priv; |
1452 | struct dvb_ca_slot *sl; |
1453 | u8 slot, connection_id; |
1454 | int status; |
1455 | u8 fragbuf[HOST_LINK_BUF_SIZE]; |
1456 | int fragpos = 0; |
1457 | int fraglen; |
1458 | unsigned long timeout; |
1459 | int written; |
1460 | |
1461 | dprintk("%s\n" , __func__); |
1462 | |
1463 | /* |
1464 | * Incoming packet has a 2 byte header. |
1465 | * hdr[0] = slot_id, hdr[1] = connection_id |
1466 | */ |
1467 | if (count < 2) |
1468 | return -EINVAL; |
1469 | |
1470 | /* extract slot & connection id */ |
1471 | if (copy_from_user(to: &slot, from: buf, n: 1)) |
1472 | return -EFAULT; |
1473 | if (copy_from_user(to: &connection_id, from: buf + 1, n: 1)) |
1474 | return -EFAULT; |
1475 | buf += 2; |
1476 | count -= 2; |
1477 | |
1478 | if (slot >= ca->slot_count) |
1479 | return -EINVAL; |
1480 | slot = array_index_nospec(slot, ca->slot_count); |
1481 | sl = &ca->slot_info[slot]; |
1482 | |
1483 | /* check if the slot is actually running */ |
1484 | if (sl->slot_state != DVB_CA_SLOTSTATE_RUNNING) |
1485 | return -EINVAL; |
1486 | |
1487 | /* fragment the packets & store in the buffer */ |
1488 | while (fragpos < count) { |
1489 | fraglen = sl->link_buf_size - 2; |
1490 | if (fraglen < 0) |
1491 | break; |
1492 | if (fraglen > HOST_LINK_BUF_SIZE - 2) |
1493 | fraglen = HOST_LINK_BUF_SIZE - 2; |
1494 | if ((count - fragpos) < fraglen) |
1495 | fraglen = count - fragpos; |
1496 | |
1497 | fragbuf[0] = connection_id; |
1498 | fragbuf[1] = ((fragpos + fraglen) < count) ? 0x80 : 0x00; |
1499 | status = copy_from_user(to: fragbuf + 2, from: buf + fragpos, n: fraglen); |
1500 | if (status) { |
1501 | status = -EFAULT; |
1502 | goto exit; |
1503 | } |
1504 | |
1505 | timeout = jiffies + HZ / 2; |
1506 | written = 0; |
1507 | while (!time_after(jiffies, timeout)) { |
1508 | /* |
1509 | * check the CAM hasn't been removed/reset in the |
1510 | * meantime |
1511 | */ |
1512 | if (sl->slot_state != DVB_CA_SLOTSTATE_RUNNING) { |
1513 | status = -EIO; |
1514 | goto exit; |
1515 | } |
1516 | |
1517 | mutex_lock(&sl->slot_lock); |
1518 | status = dvb_ca_en50221_write_data(ca, slot, buf: fragbuf, |
1519 | bytes_write: fraglen + 2, size_write_flag: 0); |
1520 | mutex_unlock(lock: &sl->slot_lock); |
1521 | if (status == (fraglen + 2)) { |
1522 | written = 1; |
1523 | break; |
1524 | } |
1525 | if (status != -EAGAIN) |
1526 | goto exit; |
1527 | |
1528 | usleep_range(min: 1000, max: 1100); |
1529 | } |
1530 | if (!written) { |
1531 | status = -EIO; |
1532 | goto exit; |
1533 | } |
1534 | |
1535 | fragpos += fraglen; |
1536 | } |
1537 | status = count + 2; |
1538 | |
1539 | exit: |
1540 | return status; |
1541 | } |
1542 | |
1543 | /* |
1544 | * Condition for waking up in dvb_ca_en50221_io_read_condition |
1545 | */ |
1546 | static int dvb_ca_en50221_io_read_condition(struct dvb_ca_private *ca, |
1547 | int *result, int *_slot) |
1548 | { |
1549 | int slot; |
1550 | int slot_count = 0; |
1551 | int idx; |
1552 | size_t fraglen; |
1553 | int connection_id = -1; |
1554 | int found = 0; |
1555 | u8 hdr[2]; |
1556 | |
1557 | slot = ca->next_read_slot; |
1558 | while ((slot_count < ca->slot_count) && (!found)) { |
1559 | struct dvb_ca_slot *sl = &ca->slot_info[slot]; |
1560 | |
1561 | if (sl->slot_state != DVB_CA_SLOTSTATE_RUNNING) |
1562 | goto nextslot; |
1563 | |
1564 | if (!sl->rx_buffer.data) |
1565 | return 0; |
1566 | |
1567 | idx = dvb_ringbuffer_pkt_next(rbuf: &sl->rx_buffer, idx: -1, pktlen: &fraglen); |
1568 | while (idx != -1) { |
1569 | dvb_ringbuffer_pkt_read(rbuf: &sl->rx_buffer, idx, offset: 0, buf: hdr, len: 2); |
1570 | if (connection_id == -1) |
1571 | connection_id = hdr[0]; |
1572 | if ((hdr[0] == connection_id) && |
1573 | ((hdr[1] & 0x80) == 0)) { |
1574 | *_slot = slot; |
1575 | found = 1; |
1576 | break; |
1577 | } |
1578 | |
1579 | idx = dvb_ringbuffer_pkt_next(rbuf: &sl->rx_buffer, idx, |
1580 | pktlen: &fraglen); |
1581 | } |
1582 | |
1583 | nextslot: |
1584 | slot = (slot + 1) % ca->slot_count; |
1585 | slot_count++; |
1586 | } |
1587 | |
1588 | ca->next_read_slot = slot; |
1589 | return found; |
1590 | } |
1591 | |
1592 | /** |
1593 | * dvb_ca_en50221_io_read - Implementation of read() syscall. |
1594 | * |
1595 | * @file: File structure. |
1596 | * @buf: Destination buffer. |
1597 | * @count: Size of destination buffer. |
1598 | * @ppos: Position in file (ignored). |
1599 | * |
1600 | * return: Number of bytes read, or <0 on error. |
1601 | */ |
1602 | static ssize_t dvb_ca_en50221_io_read(struct file *file, char __user *buf, |
1603 | size_t count, loff_t *ppos) |
1604 | { |
1605 | struct dvb_device *dvbdev = file->private_data; |
1606 | struct dvb_ca_private *ca = dvbdev->priv; |
1607 | struct dvb_ca_slot *sl; |
1608 | int status; |
1609 | int result = 0; |
1610 | u8 hdr[2]; |
1611 | int slot; |
1612 | int connection_id = -1; |
1613 | size_t idx, idx2; |
1614 | int last_fragment = 0; |
1615 | size_t fraglen; |
1616 | int pktlen; |
1617 | int dispose = 0; |
1618 | |
1619 | dprintk("%s\n" , __func__); |
1620 | |
1621 | /* |
1622 | * Outgoing packet has a 2 byte header. |
1623 | * hdr[0] = slot_id, hdr[1] = connection_id |
1624 | */ |
1625 | if (count < 2) |
1626 | return -EINVAL; |
1627 | |
1628 | /* wait for some data */ |
1629 | status = dvb_ca_en50221_io_read_condition(ca, result: &result, slot: &slot); |
1630 | if (status == 0) { |
1631 | /* if we're in nonblocking mode, exit immediately */ |
1632 | if (file->f_flags & O_NONBLOCK) |
1633 | return -EWOULDBLOCK; |
1634 | |
1635 | /* wait for some data */ |
1636 | status = wait_event_interruptible(ca->wait_queue, |
1637 | dvb_ca_en50221_io_read_condition |
1638 | (ca, &result, &slot)); |
1639 | } |
1640 | if ((status < 0) || (result < 0)) { |
1641 | if (result) |
1642 | return result; |
1643 | return status; |
1644 | } |
1645 | |
1646 | sl = &ca->slot_info[slot]; |
1647 | idx = dvb_ringbuffer_pkt_next(rbuf: &sl->rx_buffer, idx: -1, pktlen: &fraglen); |
1648 | pktlen = 2; |
1649 | do { |
1650 | if (idx == -1) { |
1651 | pr_err("dvb_ca adapter %d: BUG: read packet ended before last_fragment encountered\n" , |
1652 | ca->dvbdev->adapter->num); |
1653 | status = -EIO; |
1654 | goto exit; |
1655 | } |
1656 | |
1657 | dvb_ringbuffer_pkt_read(rbuf: &sl->rx_buffer, idx, offset: 0, buf: hdr, len: 2); |
1658 | if (connection_id == -1) |
1659 | connection_id = hdr[0]; |
1660 | if (hdr[0] == connection_id) { |
1661 | if (pktlen < count) { |
1662 | if ((pktlen + fraglen - 2) > count) |
1663 | fraglen = count - pktlen; |
1664 | else |
1665 | fraglen -= 2; |
1666 | |
1667 | status = |
1668 | dvb_ringbuffer_pkt_read_user(rbuf: &sl->rx_buffer, |
1669 | idx, offset: 2, |
1670 | buf: buf + pktlen, |
1671 | len: fraglen); |
1672 | if (status < 0) |
1673 | goto exit; |
1674 | |
1675 | pktlen += fraglen; |
1676 | } |
1677 | |
1678 | if ((hdr[1] & 0x80) == 0) |
1679 | last_fragment = 1; |
1680 | dispose = 1; |
1681 | } |
1682 | |
1683 | idx2 = dvb_ringbuffer_pkt_next(rbuf: &sl->rx_buffer, idx, pktlen: &fraglen); |
1684 | if (dispose) |
1685 | dvb_ringbuffer_pkt_dispose(rbuf: &sl->rx_buffer, idx); |
1686 | idx = idx2; |
1687 | dispose = 0; |
1688 | } while (!last_fragment); |
1689 | |
1690 | hdr[0] = slot; |
1691 | hdr[1] = connection_id; |
1692 | status = copy_to_user(to: buf, from: hdr, n: 2); |
1693 | if (status) { |
1694 | status = -EFAULT; |
1695 | goto exit; |
1696 | } |
1697 | status = pktlen; |
1698 | |
1699 | exit: |
1700 | return status; |
1701 | } |
1702 | |
1703 | /** |
1704 | * dvb_ca_en50221_io_open - Implementation of file open syscall. |
1705 | * |
1706 | * @inode: Inode concerned. |
1707 | * @file: File concerned. |
1708 | * |
1709 | * return: 0 on success, <0 on failure. |
1710 | */ |
1711 | static int dvb_ca_en50221_io_open(struct inode *inode, struct file *file) |
1712 | { |
1713 | struct dvb_device *dvbdev = file->private_data; |
1714 | struct dvb_ca_private *ca = dvbdev->priv; |
1715 | int err; |
1716 | int i; |
1717 | |
1718 | dprintk("%s\n" , __func__); |
1719 | |
1720 | mutex_lock(&ca->remove_mutex); |
1721 | |
1722 | if (ca->exit) { |
1723 | mutex_unlock(lock: &ca->remove_mutex); |
1724 | return -ENODEV; |
1725 | } |
1726 | |
1727 | if (!try_module_get(module: ca->pub->owner)) { |
1728 | mutex_unlock(lock: &ca->remove_mutex); |
1729 | return -EIO; |
1730 | } |
1731 | |
1732 | err = dvb_generic_open(inode, file); |
1733 | if (err < 0) { |
1734 | module_put(module: ca->pub->owner); |
1735 | mutex_unlock(lock: &ca->remove_mutex); |
1736 | return err; |
1737 | } |
1738 | |
1739 | for (i = 0; i < ca->slot_count; i++) { |
1740 | struct dvb_ca_slot *sl = &ca->slot_info[i]; |
1741 | |
1742 | if (sl->slot_state == DVB_CA_SLOTSTATE_RUNNING) { |
1743 | if (!sl->rx_buffer.data) { |
1744 | /* |
1745 | * it is safe to call this here without locks |
1746 | * because ca->open == 0. Data is not read in |
1747 | * this case |
1748 | */ |
1749 | dvb_ringbuffer_flush(rbuf: &sl->rx_buffer); |
1750 | } |
1751 | } |
1752 | } |
1753 | |
1754 | ca->open = 1; |
1755 | dvb_ca_en50221_thread_update_delay(ca); |
1756 | dvb_ca_en50221_thread_wakeup(ca); |
1757 | |
1758 | dvb_ca_private_get(ca); |
1759 | |
1760 | mutex_unlock(lock: &ca->remove_mutex); |
1761 | return 0; |
1762 | } |
1763 | |
1764 | /** |
1765 | * dvb_ca_en50221_io_release - Implementation of file close syscall. |
1766 | * |
1767 | * @inode: Inode concerned. |
1768 | * @file: File concerned. |
1769 | * |
1770 | * return: 0 on success, <0 on failure. |
1771 | */ |
1772 | static int dvb_ca_en50221_io_release(struct inode *inode, struct file *file) |
1773 | { |
1774 | struct dvb_device *dvbdev = file->private_data; |
1775 | struct dvb_ca_private *ca = dvbdev->priv; |
1776 | int err; |
1777 | |
1778 | dprintk("%s\n" , __func__); |
1779 | |
1780 | mutex_lock(&ca->remove_mutex); |
1781 | |
1782 | /* mark the CA device as closed */ |
1783 | ca->open = 0; |
1784 | dvb_ca_en50221_thread_update_delay(ca); |
1785 | |
1786 | err = dvb_generic_release(inode, file); |
1787 | |
1788 | module_put(module: ca->pub->owner); |
1789 | |
1790 | dvb_ca_private_put(ca); |
1791 | |
1792 | if (dvbdev->users == 1 && ca->exit == 1) { |
1793 | mutex_unlock(lock: &ca->remove_mutex); |
1794 | wake_up(&dvbdev->wait_queue); |
1795 | } else { |
1796 | mutex_unlock(lock: &ca->remove_mutex); |
1797 | } |
1798 | |
1799 | return err; |
1800 | } |
1801 | |
1802 | /** |
1803 | * dvb_ca_en50221_io_poll - Implementation of poll() syscall. |
1804 | * |
1805 | * @file: File concerned. |
1806 | * @wait: poll wait table. |
1807 | * |
1808 | * return: Standard poll mask. |
1809 | */ |
1810 | static __poll_t dvb_ca_en50221_io_poll(struct file *file, poll_table *wait) |
1811 | { |
1812 | struct dvb_device *dvbdev = file->private_data; |
1813 | struct dvb_ca_private *ca = dvbdev->priv; |
1814 | __poll_t mask = 0; |
1815 | int slot; |
1816 | int result = 0; |
1817 | |
1818 | dprintk("%s\n" , __func__); |
1819 | |
1820 | poll_wait(filp: file, wait_address: &ca->wait_queue, p: wait); |
1821 | |
1822 | if (dvb_ca_en50221_io_read_condition(ca, result: &result, slot: &slot) == 1) |
1823 | mask |= EPOLLIN; |
1824 | |
1825 | /* if there is something, return now */ |
1826 | if (mask) |
1827 | return mask; |
1828 | |
1829 | if (dvb_ca_en50221_io_read_condition(ca, result: &result, slot: &slot) == 1) |
1830 | mask |= EPOLLIN; |
1831 | |
1832 | return mask; |
1833 | } |
1834 | |
1835 | static const struct file_operations dvb_ca_fops = { |
1836 | .owner = THIS_MODULE, |
1837 | .read = dvb_ca_en50221_io_read, |
1838 | .write = dvb_ca_en50221_io_write, |
1839 | .unlocked_ioctl = dvb_ca_en50221_io_ioctl, |
1840 | .open = dvb_ca_en50221_io_open, |
1841 | .release = dvb_ca_en50221_io_release, |
1842 | .poll = dvb_ca_en50221_io_poll, |
1843 | .llseek = noop_llseek, |
1844 | }; |
1845 | |
1846 | static const struct dvb_device dvbdev_ca = { |
1847 | .priv = NULL, |
1848 | .users = 1, |
1849 | .readers = 1, |
1850 | .writers = 1, |
1851 | #if defined(CONFIG_MEDIA_CONTROLLER_DVB) |
1852 | .name = "dvb-ca-en50221" , |
1853 | #endif |
1854 | .fops = &dvb_ca_fops, |
1855 | }; |
1856 | |
1857 | /* ************************************************************************** */ |
1858 | /* Initialisation/shutdown functions */ |
1859 | |
1860 | /** |
1861 | * dvb_ca_en50221_init - Initialise a new DVB CA EN50221 interface device. |
1862 | * |
1863 | * @dvb_adapter: DVB adapter to attach the new CA device to. |
1864 | * @pubca: The dvb_ca instance. |
1865 | * @flags: Flags describing the CA device (DVB_CA_FLAG_*). |
1866 | * @slot_count: Number of slots supported. |
1867 | * |
1868 | * return: 0 on success, nonzero on failure |
1869 | */ |
1870 | int dvb_ca_en50221_init(struct dvb_adapter *dvb_adapter, |
1871 | struct dvb_ca_en50221 *pubca, int flags, int slot_count) |
1872 | { |
1873 | int ret; |
1874 | struct dvb_ca_private *ca = NULL; |
1875 | int i; |
1876 | |
1877 | dprintk("%s\n" , __func__); |
1878 | |
1879 | if (slot_count < 1) |
1880 | return -EINVAL; |
1881 | |
1882 | /* initialise the system data */ |
1883 | ca = kzalloc(size: sizeof(*ca), GFP_KERNEL); |
1884 | if (!ca) { |
1885 | ret = -ENOMEM; |
1886 | goto exit; |
1887 | } |
1888 | kref_init(kref: &ca->refcount); |
1889 | ca->pub = pubca; |
1890 | ca->flags = flags; |
1891 | ca->slot_count = slot_count; |
1892 | ca->slot_info = kcalloc(n: slot_count, size: sizeof(struct dvb_ca_slot), |
1893 | GFP_KERNEL); |
1894 | if (!ca->slot_info) { |
1895 | ret = -ENOMEM; |
1896 | goto free_ca; |
1897 | } |
1898 | init_waitqueue_head(&ca->wait_queue); |
1899 | ca->open = 0; |
1900 | ca->wakeup = 0; |
1901 | ca->next_read_slot = 0; |
1902 | pubca->private = ca; |
1903 | |
1904 | /* register the DVB device */ |
1905 | ret = dvb_register_device(adap: dvb_adapter, pdvbdev: &ca->dvbdev, template: &dvbdev_ca, priv: ca, |
1906 | type: DVB_DEVICE_CA, demux_sink_pads: 0); |
1907 | if (ret) |
1908 | goto free_slot_info; |
1909 | |
1910 | /* now initialise each slot */ |
1911 | for (i = 0; i < slot_count; i++) { |
1912 | struct dvb_ca_slot *sl = &ca->slot_info[i]; |
1913 | |
1914 | memset(sl, 0, sizeof(struct dvb_ca_slot)); |
1915 | sl->slot_state = DVB_CA_SLOTSTATE_NONE; |
1916 | atomic_set(v: &sl->camchange_count, i: 0); |
1917 | sl->camchange_type = DVB_CA_EN50221_CAMCHANGE_REMOVED; |
1918 | mutex_init(&sl->slot_lock); |
1919 | } |
1920 | |
1921 | mutex_init(&ca->ioctl_mutex); |
1922 | mutex_init(&ca->remove_mutex); |
1923 | |
1924 | if (signal_pending(current)) { |
1925 | ret = -EINTR; |
1926 | goto unregister_device; |
1927 | } |
1928 | mb(); |
1929 | |
1930 | /* create a kthread for monitoring this CA device */ |
1931 | ca->thread = kthread_run(dvb_ca_en50221_thread, ca, "kdvb-ca-%i:%i" , |
1932 | ca->dvbdev->adapter->num, ca->dvbdev->id); |
1933 | if (IS_ERR(ptr: ca->thread)) { |
1934 | ret = PTR_ERR(ptr: ca->thread); |
1935 | pr_err("dvb_ca_init: failed to start kernel_thread (%d)\n" , |
1936 | ret); |
1937 | goto unregister_device; |
1938 | } |
1939 | return 0; |
1940 | |
1941 | unregister_device: |
1942 | dvb_unregister_device(dvbdev: ca->dvbdev); |
1943 | free_slot_info: |
1944 | kfree(objp: ca->slot_info); |
1945 | free_ca: |
1946 | kfree(objp: ca); |
1947 | exit: |
1948 | pubca->private = NULL; |
1949 | return ret; |
1950 | } |
1951 | EXPORT_SYMBOL(dvb_ca_en50221_init); |
1952 | |
1953 | /** |
1954 | * dvb_ca_en50221_release - Release a DVB CA EN50221 interface device. |
1955 | * |
1956 | * @pubca: The associated dvb_ca instance. |
1957 | */ |
1958 | void dvb_ca_en50221_release(struct dvb_ca_en50221 *pubca) |
1959 | { |
1960 | struct dvb_ca_private *ca = pubca->private; |
1961 | int i; |
1962 | |
1963 | dprintk("%s\n" , __func__); |
1964 | |
1965 | mutex_lock(&ca->remove_mutex); |
1966 | ca->exit = 1; |
1967 | mutex_unlock(lock: &ca->remove_mutex); |
1968 | |
1969 | if (ca->dvbdev->users < 1) |
1970 | wait_event(ca->dvbdev->wait_queue, |
1971 | ca->dvbdev->users == 1); |
1972 | |
1973 | /* shutdown the thread if there was one */ |
1974 | kthread_stop(k: ca->thread); |
1975 | |
1976 | for (i = 0; i < ca->slot_count; i++) |
1977 | dvb_ca_en50221_slot_shutdown(ca, slot: i); |
1978 | |
1979 | dvb_remove_device(dvbdev: ca->dvbdev); |
1980 | dvb_ca_private_put(ca); |
1981 | pubca->private = NULL; |
1982 | } |
1983 | EXPORT_SYMBOL(dvb_ca_en50221_release); |
1984 | |