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8#include <linux/errno.h>
9#include <linux/init.h>
10#include <linux/module.h>
11#include <linux/kernel.h>
12#include <linux/kmod.h>
13#include <linux/ktime.h>
14#include <linux/slab.h>
15#include <linux/mm.h>
16#include <linux/string.h>
17#include <linux/types.h>
18#include <linux/uaccess.h>
19#include <linux/version.h>
20
21#include <media/cec-pin.h>
22#include "cec-priv.h"
23#include "cec-pin-priv.h"
24
25static inline struct cec_devnode *cec_devnode_data(struct file *filp)
26{
27 struct cec_fh *fh = filp->private_data;
28
29 return &fh->adap->devnode;
30}
31
32
33
34static __poll_t cec_poll(struct file *filp,
35 struct poll_table_struct *poll)
36{
37 struct cec_fh *fh = filp->private_data;
38 struct cec_adapter *adap = fh->adap;
39 __poll_t res = 0;
40
41 if (!cec_is_registered(adap))
42 return EPOLLERR | EPOLLHUP;
43 mutex_lock(&adap->lock);
44 if (adap->is_configured &&
45 adap->transmit_queue_sz < CEC_MAX_MSG_TX_QUEUE_SZ)
46 res |= EPOLLOUT | EPOLLWRNORM;
47 if (fh->queued_msgs)
48 res |= EPOLLIN | EPOLLRDNORM;
49 if (fh->total_queued_events)
50 res |= EPOLLPRI;
51 poll_wait(filp, &fh->wait, poll);
52 mutex_unlock(&adap->lock);
53 return res;
54}
55
56static bool cec_is_busy(const struct cec_adapter *adap,
57 const struct cec_fh *fh)
58{
59 bool valid_initiator = adap->cec_initiator && adap->cec_initiator == fh;
60 bool valid_follower = adap->cec_follower && adap->cec_follower == fh;
61
62
63
64
65 if (valid_initiator || valid_follower)
66 return false;
67
68
69
70
71 return adap->cec_initiator ||
72 fh->mode_initiator == CEC_MODE_NO_INITIATOR;
73}
74
75static long cec_adap_g_caps(struct cec_adapter *adap,
76 struct cec_caps __user *parg)
77{
78 struct cec_caps caps = {};
79
80 strlcpy(caps.driver, adap->devnode.dev.parent->driver->name,
81 sizeof(caps.driver));
82 strlcpy(caps.name, adap->name, sizeof(caps.name));
83 caps.available_log_addrs = adap->available_log_addrs;
84 caps.capabilities = adap->capabilities;
85 caps.version = LINUX_VERSION_CODE;
86 if (copy_to_user(parg, &caps, sizeof(caps)))
87 return -EFAULT;
88 return 0;
89}
90
91static long cec_adap_g_phys_addr(struct cec_adapter *adap,
92 __u16 __user *parg)
93{
94 u16 phys_addr;
95
96 mutex_lock(&adap->lock);
97 phys_addr = adap->phys_addr;
98 mutex_unlock(&adap->lock);
99 if (copy_to_user(parg, &phys_addr, sizeof(phys_addr)))
100 return -EFAULT;
101 return 0;
102}
103
104static long cec_adap_s_phys_addr(struct cec_adapter *adap, struct cec_fh *fh,
105 bool block, __u16 __user *parg)
106{
107 u16 phys_addr;
108 long err;
109
110 if (!(adap->capabilities & CEC_CAP_PHYS_ADDR))
111 return -ENOTTY;
112 if (copy_from_user(&phys_addr, parg, sizeof(phys_addr)))
113 return -EFAULT;
114
115 err = cec_phys_addr_validate(phys_addr, NULL, NULL);
116 if (err)
117 return err;
118 mutex_lock(&adap->lock);
119 if (cec_is_busy(adap, fh))
120 err = -EBUSY;
121 else
122 __cec_s_phys_addr(adap, phys_addr, block);
123 mutex_unlock(&adap->lock);
124 return err;
125}
126
127static long cec_adap_g_log_addrs(struct cec_adapter *adap,
128 struct cec_log_addrs __user *parg)
129{
130 struct cec_log_addrs log_addrs;
131
132 mutex_lock(&adap->lock);
133 log_addrs = adap->log_addrs;
134 if (!adap->is_configured)
135 memset(log_addrs.log_addr, CEC_LOG_ADDR_INVALID,
136 sizeof(log_addrs.log_addr));
137 mutex_unlock(&adap->lock);
138
139 if (copy_to_user(parg, &log_addrs, sizeof(log_addrs)))
140 return -EFAULT;
141 return 0;
142}
143
144static long cec_adap_s_log_addrs(struct cec_adapter *adap, struct cec_fh *fh,
145 bool block, struct cec_log_addrs __user *parg)
146{
147 struct cec_log_addrs log_addrs;
148 long err = -EBUSY;
149
150 if (!(adap->capabilities & CEC_CAP_LOG_ADDRS))
151 return -ENOTTY;
152 if (copy_from_user(&log_addrs, parg, sizeof(log_addrs)))
153 return -EFAULT;
154 log_addrs.flags &= CEC_LOG_ADDRS_FL_ALLOW_UNREG_FALLBACK |
155 CEC_LOG_ADDRS_FL_ALLOW_RC_PASSTHRU |
156 CEC_LOG_ADDRS_FL_CDC_ONLY;
157 mutex_lock(&adap->lock);
158 if (!adap->is_configuring &&
159 (!log_addrs.num_log_addrs || !adap->is_configured) &&
160 !cec_is_busy(adap, fh)) {
161 err = __cec_s_log_addrs(adap, &log_addrs, block);
162 if (!err)
163 log_addrs = adap->log_addrs;
164 }
165 mutex_unlock(&adap->lock);
166 if (err)
167 return err;
168 if (copy_to_user(parg, &log_addrs, sizeof(log_addrs)))
169 return -EFAULT;
170 return 0;
171}
172
173static long cec_transmit(struct cec_adapter *adap, struct cec_fh *fh,
174 bool block, struct cec_msg __user *parg)
175{
176 struct cec_msg msg = {};
177 long err = 0;
178
179 if (!(adap->capabilities & CEC_CAP_TRANSMIT))
180 return -ENOTTY;
181 if (copy_from_user(&msg, parg, sizeof(msg)))
182 return -EFAULT;
183
184
185 if ((adap->log_addrs.flags & CEC_LOG_ADDRS_FL_CDC_ONLY) &&
186 (msg.len == 1 || msg.msg[1] != CEC_MSG_CDC_MESSAGE))
187 return -EINVAL;
188
189 mutex_lock(&adap->lock);
190 if (adap->log_addrs.num_log_addrs == 0)
191 err = -EPERM;
192 else if (adap->is_configuring)
193 err = -ENONET;
194 else if (!adap->is_configured &&
195 (adap->needs_hpd || msg.msg[0] != 0xf0))
196 err = -ENONET;
197 else if (cec_is_busy(adap, fh))
198 err = -EBUSY;
199 else
200 err = cec_transmit_msg_fh(adap, &msg, fh, block);
201 mutex_unlock(&adap->lock);
202 if (err)
203 return err;
204 if (copy_to_user(parg, &msg, sizeof(msg)))
205 return -EFAULT;
206 return 0;
207}
208
209
210static int cec_receive_msg(struct cec_fh *fh, struct cec_msg *msg, bool block)
211{
212 u32 timeout = msg->timeout;
213 int res;
214
215 do {
216 mutex_lock(&fh->lock);
217
218 if (fh->queued_msgs) {
219
220 struct cec_msg_entry *entry =
221 list_first_entry(&fh->msgs,
222 struct cec_msg_entry, list);
223
224 list_del(&entry->list);
225 *msg = entry->msg;
226 kfree(entry);
227 fh->queued_msgs--;
228 mutex_unlock(&fh->lock);
229
230 msg->timeout = timeout;
231 return 0;
232 }
233
234
235 mutex_unlock(&fh->lock);
236
237
238 if (!block)
239 return -EAGAIN;
240
241 if (msg->timeout) {
242
243 res = wait_event_interruptible_timeout(fh->wait,
244 fh->queued_msgs,
245 msecs_to_jiffies(msg->timeout));
246 if (res == 0)
247 res = -ETIMEDOUT;
248 else if (res > 0)
249 res = 0;
250 } else {
251
252 res = wait_event_interruptible(fh->wait,
253 fh->queued_msgs);
254 }
255
256 } while (!res);
257 return res;
258}
259
260static long cec_receive(struct cec_adapter *adap, struct cec_fh *fh,
261 bool block, struct cec_msg __user *parg)
262{
263 struct cec_msg msg = {};
264 long err;
265
266 if (copy_from_user(&msg, parg, sizeof(msg)))
267 return -EFAULT;
268
269 err = cec_receive_msg(fh, &msg, block);
270 if (err)
271 return err;
272 msg.flags = 0;
273 if (copy_to_user(parg, &msg, sizeof(msg)))
274 return -EFAULT;
275 return 0;
276}
277
278static long cec_dqevent(struct cec_adapter *adap, struct cec_fh *fh,
279 bool block, struct cec_event __user *parg)
280{
281 struct cec_event_entry *ev = NULL;
282 u64 ts = ~0ULL;
283 unsigned int i;
284 unsigned int ev_idx;
285 long err = 0;
286
287 mutex_lock(&fh->lock);
288 while (!fh->total_queued_events && block) {
289 mutex_unlock(&fh->lock);
290 err = wait_event_interruptible(fh->wait,
291 fh->total_queued_events);
292 if (err)
293 return err;
294 mutex_lock(&fh->lock);
295 }
296
297
298 for (i = 0; i < CEC_NUM_EVENTS; i++) {
299 struct cec_event_entry *entry =
300 list_first_entry_or_null(&fh->events[i],
301 struct cec_event_entry, list);
302
303 if (entry && entry->ev.ts <= ts) {
304 ev = entry;
305 ev_idx = i;
306 ts = ev->ev.ts;
307 }
308 }
309
310 if (!ev) {
311 err = -EAGAIN;
312 goto unlock;
313 }
314 list_del(&ev->list);
315
316 if (copy_to_user(parg, &ev->ev, sizeof(ev->ev)))
317 err = -EFAULT;
318 if (ev_idx >= CEC_NUM_CORE_EVENTS)
319 kfree(ev);
320 fh->queued_events[ev_idx]--;
321 fh->total_queued_events--;
322
323unlock:
324 mutex_unlock(&fh->lock);
325 return err;
326}
327
328static long cec_g_mode(struct cec_adapter *adap, struct cec_fh *fh,
329 u32 __user *parg)
330{
331 u32 mode = fh->mode_initiator | fh->mode_follower;
332
333 if (copy_to_user(parg, &mode, sizeof(mode)))
334 return -EFAULT;
335 return 0;
336}
337
338static long cec_s_mode(struct cec_adapter *adap, struct cec_fh *fh,
339 u32 __user *parg)
340{
341 u32 mode;
342 u8 mode_initiator;
343 u8 mode_follower;
344 bool send_pin_event = false;
345 long err = 0;
346
347 if (copy_from_user(&mode, parg, sizeof(mode)))
348 return -EFAULT;
349 if (mode & ~(CEC_MODE_INITIATOR_MSK | CEC_MODE_FOLLOWER_MSK)) {
350 dprintk(1, "%s: invalid mode bits set\n", __func__);
351 return -EINVAL;
352 }
353
354 mode_initiator = mode & CEC_MODE_INITIATOR_MSK;
355 mode_follower = mode & CEC_MODE_FOLLOWER_MSK;
356
357 if (mode_initiator > CEC_MODE_EXCL_INITIATOR ||
358 mode_follower > CEC_MODE_MONITOR_ALL) {
359 dprintk(1, "%s: unknown mode\n", __func__);
360 return -EINVAL;
361 }
362
363 if (mode_follower == CEC_MODE_MONITOR_ALL &&
364 !(adap->capabilities & CEC_CAP_MONITOR_ALL)) {
365 dprintk(1, "%s: MONITOR_ALL not supported\n", __func__);
366 return -EINVAL;
367 }
368
369 if (mode_follower == CEC_MODE_MONITOR_PIN &&
370 !(adap->capabilities & CEC_CAP_MONITOR_PIN)) {
371 dprintk(1, "%s: MONITOR_PIN not supported\n", __func__);
372 return -EINVAL;
373 }
374
375
376 if ((mode_initiator == CEC_MODE_NO_INITIATOR ||
377 !(adap->capabilities & CEC_CAP_TRANSMIT)) &&
378 mode_follower >= CEC_MODE_FOLLOWER &&
379 mode_follower <= CEC_MODE_EXCL_FOLLOWER_PASSTHRU) {
380 dprintk(1, "%s: cannot transmit\n", __func__);
381 return -EINVAL;
382 }
383
384
385 if (mode_initiator && mode_follower >= CEC_MODE_MONITOR_PIN) {
386 dprintk(1, "%s: monitor modes require NO_INITIATOR\n",
387 __func__);
388 return -EINVAL;
389 }
390
391
392 if (mode_follower >= CEC_MODE_MONITOR_PIN && !capable(CAP_NET_ADMIN))
393 return -EPERM;
394
395 mutex_lock(&adap->lock);
396
397
398
399
400 if ((mode_follower == CEC_MODE_EXCL_FOLLOWER ||
401 mode_follower == CEC_MODE_EXCL_FOLLOWER_PASSTHRU) &&
402 adap->cec_follower && adap->cec_follower != fh)
403 err = -EBUSY;
404
405
406
407
408 if (mode_initiator == CEC_MODE_EXCL_INITIATOR &&
409 adap->cec_initiator && adap->cec_initiator != fh)
410 err = -EBUSY;
411
412 if (!err) {
413 bool old_mon_all = fh->mode_follower == CEC_MODE_MONITOR_ALL;
414 bool new_mon_all = mode_follower == CEC_MODE_MONITOR_ALL;
415
416 if (old_mon_all != new_mon_all) {
417 if (new_mon_all)
418 err = cec_monitor_all_cnt_inc(adap);
419 else
420 cec_monitor_all_cnt_dec(adap);
421 }
422 }
423
424 if (!err) {
425 bool old_mon_pin = fh->mode_follower == CEC_MODE_MONITOR_PIN;
426 bool new_mon_pin = mode_follower == CEC_MODE_MONITOR_PIN;
427
428 if (old_mon_pin != new_mon_pin) {
429 send_pin_event = new_mon_pin;
430 if (new_mon_pin)
431 err = cec_monitor_pin_cnt_inc(adap);
432 else
433 cec_monitor_pin_cnt_dec(adap);
434 }
435 }
436
437 if (err) {
438 mutex_unlock(&adap->lock);
439 return err;
440 }
441
442 if (fh->mode_follower == CEC_MODE_FOLLOWER)
443 adap->follower_cnt--;
444 if (mode_follower == CEC_MODE_FOLLOWER)
445 adap->follower_cnt++;
446 if (send_pin_event) {
447 struct cec_event ev = {
448 .flags = CEC_EVENT_FL_INITIAL_STATE,
449 };
450
451 ev.event = adap->cec_pin_is_high ? CEC_EVENT_PIN_CEC_HIGH :
452 CEC_EVENT_PIN_CEC_LOW;
453 cec_queue_event_fh(fh, &ev, 0);
454 }
455 if (mode_follower == CEC_MODE_EXCL_FOLLOWER ||
456 mode_follower == CEC_MODE_EXCL_FOLLOWER_PASSTHRU) {
457 adap->passthrough =
458 mode_follower == CEC_MODE_EXCL_FOLLOWER_PASSTHRU;
459 adap->cec_follower = fh;
460 } else if (adap->cec_follower == fh) {
461 adap->passthrough = false;
462 adap->cec_follower = NULL;
463 }
464 if (mode_initiator == CEC_MODE_EXCL_INITIATOR)
465 adap->cec_initiator = fh;
466 else if (adap->cec_initiator == fh)
467 adap->cec_initiator = NULL;
468 fh->mode_initiator = mode_initiator;
469 fh->mode_follower = mode_follower;
470 mutex_unlock(&adap->lock);
471 return 0;
472}
473
474static long cec_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
475{
476 struct cec_fh *fh = filp->private_data;
477 struct cec_adapter *adap = fh->adap;
478 bool block = !(filp->f_flags & O_NONBLOCK);
479 void __user *parg = (void __user *)arg;
480
481 if (!cec_is_registered(adap))
482 return -ENODEV;
483
484 switch (cmd) {
485 case CEC_ADAP_G_CAPS:
486 return cec_adap_g_caps(adap, parg);
487
488 case CEC_ADAP_G_PHYS_ADDR:
489 return cec_adap_g_phys_addr(adap, parg);
490
491 case CEC_ADAP_S_PHYS_ADDR:
492 return cec_adap_s_phys_addr(adap, fh, block, parg);
493
494 case CEC_ADAP_G_LOG_ADDRS:
495 return cec_adap_g_log_addrs(adap, parg);
496
497 case CEC_ADAP_S_LOG_ADDRS:
498 return cec_adap_s_log_addrs(adap, fh, block, parg);
499
500 case CEC_TRANSMIT:
501 return cec_transmit(adap, fh, block, parg);
502
503 case CEC_RECEIVE:
504 return cec_receive(adap, fh, block, parg);
505
506 case CEC_DQEVENT:
507 return cec_dqevent(adap, fh, block, parg);
508
509 case CEC_G_MODE:
510 return cec_g_mode(adap, fh, parg);
511
512 case CEC_S_MODE:
513 return cec_s_mode(adap, fh, parg);
514
515 default:
516 return -ENOTTY;
517 }
518}
519
520static int cec_open(struct inode *inode, struct file *filp)
521{
522 struct cec_devnode *devnode =
523 container_of(inode->i_cdev, struct cec_devnode, cdev);
524 struct cec_adapter *adap = to_cec_adapter(devnode);
525 struct cec_fh *fh = kzalloc(sizeof(*fh), GFP_KERNEL);
526
527
528
529
530 struct cec_event ev = {
531 .event = CEC_EVENT_STATE_CHANGE,
532 .flags = CEC_EVENT_FL_INITIAL_STATE,
533 };
534 unsigned int i;
535 int err;
536
537 if (!fh)
538 return -ENOMEM;
539
540 INIT_LIST_HEAD(&fh->msgs);
541 INIT_LIST_HEAD(&fh->xfer_list);
542 for (i = 0; i < CEC_NUM_EVENTS; i++)
543 INIT_LIST_HEAD(&fh->events[i]);
544 mutex_init(&fh->lock);
545 init_waitqueue_head(&fh->wait);
546
547 fh->mode_initiator = CEC_MODE_INITIATOR;
548 fh->adap = adap;
549
550 err = cec_get_device(devnode);
551 if (err) {
552 kfree(fh);
553 return err;
554 }
555
556 mutex_lock(&devnode->lock);
557 if (list_empty(&devnode->fhs) &&
558 !adap->needs_hpd &&
559 adap->phys_addr == CEC_PHYS_ADDR_INVALID) {
560 err = adap->ops->adap_enable(adap, true);
561 if (err) {
562 mutex_unlock(&devnode->lock);
563 kfree(fh);
564 return err;
565 }
566 }
567 filp->private_data = fh;
568
569
570 ev.state_change.phys_addr = adap->phys_addr;
571 ev.state_change.log_addr_mask = adap->log_addrs.log_addr_mask;
572 cec_queue_event_fh(fh, &ev, 0);
573#ifdef CONFIG_CEC_PIN
574 if (adap->pin && adap->pin->ops->read_hpd) {
575 err = adap->pin->ops->read_hpd(adap);
576 if (err >= 0) {
577 ev.event = err ? CEC_EVENT_PIN_HPD_HIGH :
578 CEC_EVENT_PIN_HPD_LOW;
579 cec_queue_event_fh(fh, &ev, 0);
580 }
581 }
582#endif
583
584 list_add(&fh->list, &devnode->fhs);
585 mutex_unlock(&devnode->lock);
586
587 return 0;
588}
589
590
591static int cec_release(struct inode *inode, struct file *filp)
592{
593 struct cec_devnode *devnode = cec_devnode_data(filp);
594 struct cec_adapter *adap = to_cec_adapter(devnode);
595 struct cec_fh *fh = filp->private_data;
596 unsigned int i;
597
598 mutex_lock(&adap->lock);
599 if (adap->cec_initiator == fh)
600 adap->cec_initiator = NULL;
601 if (adap->cec_follower == fh) {
602 adap->cec_follower = NULL;
603 adap->passthrough = false;
604 }
605 if (fh->mode_follower == CEC_MODE_FOLLOWER)
606 adap->follower_cnt--;
607 if (fh->mode_follower == CEC_MODE_MONITOR_PIN)
608 cec_monitor_pin_cnt_dec(adap);
609 if (fh->mode_follower == CEC_MODE_MONITOR_ALL)
610 cec_monitor_all_cnt_dec(adap);
611 mutex_unlock(&adap->lock);
612
613 mutex_lock(&devnode->lock);
614 list_del(&fh->list);
615 if (cec_is_registered(adap) && list_empty(&devnode->fhs) &&
616 !adap->needs_hpd && adap->phys_addr == CEC_PHYS_ADDR_INVALID) {
617 WARN_ON(adap->ops->adap_enable(adap, false));
618 }
619 mutex_unlock(&devnode->lock);
620
621
622 mutex_lock(&adap->lock);
623 while (!list_empty(&fh->xfer_list)) {
624 struct cec_data *data =
625 list_first_entry(&fh->xfer_list, struct cec_data, xfer_list);
626
627 data->blocking = false;
628 data->fh = NULL;
629 list_del(&data->xfer_list);
630 }
631 mutex_unlock(&adap->lock);
632 while (!list_empty(&fh->msgs)) {
633 struct cec_msg_entry *entry =
634 list_first_entry(&fh->msgs, struct cec_msg_entry, list);
635
636 list_del(&entry->list);
637 kfree(entry);
638 }
639 for (i = CEC_NUM_CORE_EVENTS; i < CEC_NUM_EVENTS; i++) {
640 while (!list_empty(&fh->events[i])) {
641 struct cec_event_entry *entry =
642 list_first_entry(&fh->events[i],
643 struct cec_event_entry, list);
644
645 list_del(&entry->list);
646 kfree(entry);
647 }
648 }
649 kfree(fh);
650
651 cec_put_device(devnode);
652 filp->private_data = NULL;
653 return 0;
654}
655
656const struct file_operations cec_devnode_fops = {
657 .owner = THIS_MODULE,
658 .open = cec_open,
659 .unlocked_ioctl = cec_ioctl,
660 .release = cec_release,
661 .poll = cec_poll,
662 .llseek = no_llseek,
663};
664
