1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * cec-api.c - HDMI Consumer Electronics Control framework - API
4 *
5 * Copyright 2016 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
6 */
7
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
cec_devnode_data(struct file * filp)25 static 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 /* CEC file operations */
33
cec_poll(struct file * filp,struct poll_table_struct * poll)34 static __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
cec_is_busy(const struct cec_adapter * adap,const struct cec_fh * fh)56 static 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 * Exclusive initiators and followers can always access the CEC adapter
64 */
65 if (valid_initiator || valid_follower)
66 return false;
67 /*
68 * All others can only access the CEC adapter if there is no
69 * exclusive initiator and they are in INITIATOR mode.
70 */
71 return adap->cec_initiator ||
72 fh->mode_initiator == CEC_MODE_NO_INITIATOR;
73 }
74
cec_adap_g_caps(struct cec_adapter * adap,struct cec_caps __user * parg)75 static 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
cec_adap_g_phys_addr(struct cec_adapter * adap,__u16 __user * parg)91 static 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
cec_adap_s_phys_addr(struct cec_adapter * adap,struct cec_fh * fh,bool block,__u16 __user * parg)104 static 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
cec_adap_g_log_addrs(struct cec_adapter * adap,struct cec_log_addrs __user * parg)127 static 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
cec_adap_s_log_addrs(struct cec_adapter * adap,struct cec_fh * fh,bool block,struct cec_log_addrs __user * parg)144 static 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
cec_transmit(struct cec_adapter * adap,struct cec_fh * fh,bool block,struct cec_msg __user * parg)173 static 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 /* A CDC-Only device can only send CDC messages */
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 /* Called by CEC_RECEIVE: wait for a message to arrive */
cec_receive_msg(struct cec_fh * fh,struct cec_msg * msg,bool block)210 static 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 /* Are there received messages queued up? */
218 if (fh->queued_msgs) {
219 /* Yes, return the first one */
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 /* restore original timeout value */
230 msg->timeout = timeout;
231 return 0;
232 }
233
234 /* No, return EAGAIN in non-blocking mode or wait */
235 mutex_unlock(&fh->lock);
236
237 /* Return when in non-blocking mode */
238 if (!block)
239 return -EAGAIN;
240
241 if (msg->timeout) {
242 /* The user specified a timeout */
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 /* Wait indefinitely */
252 res = wait_event_interruptible(fh->wait,
253 fh->queued_msgs);
254 }
255 /* Exit on error, otherwise loop to get the new message */
256 } while (!res);
257 return res;
258 }
259
cec_receive(struct cec_adapter * adap,struct cec_fh * fh,bool block,struct cec_msg __user * parg)260 static 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
cec_dqevent(struct cec_adapter * adap,struct cec_fh * fh,bool block,struct cec_event __user * parg)278 static 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 /* Find the oldest event */
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
323 unlock:
324 mutex_unlock(&fh->lock);
325 return err;
326 }
327
cec_g_mode(struct cec_adapter * adap,struct cec_fh * fh,u32 __user * parg)328 static 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
cec_s_mode(struct cec_adapter * adap,struct cec_fh * fh,u32 __user * parg)338 static 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 /* Follower modes should always be able to send CEC messages */
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 /* Monitor modes require CEC_MODE_NO_INITIATOR */
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 /* Monitor modes require CAP_NET_ADMIN */
392 if (mode_follower >= CEC_MODE_MONITOR_PIN && !capable(CAP_NET_ADMIN))
393 return -EPERM;
394
395 mutex_lock(&adap->lock);
396 /*
397 * You can't become exclusive follower if someone else already
398 * has that job.
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 * You can't become exclusive initiator if someone else already
406 * has that job.
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
cec_ioctl(struct file * filp,unsigned int cmd,unsigned long arg)474 static 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
cec_open(struct inode * inode,struct file * filp)520 static 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 * Initial events that are automatically sent when the cec device is
528 * opened.
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 /* Queue up initial state events */
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 if (adap->pin && adap->pin->ops->read_5v) {
583 err = adap->pin->ops->read_5v(adap);
584 if (err >= 0) {
585 ev.event = err ? CEC_EVENT_PIN_5V_HIGH :
586 CEC_EVENT_PIN_5V_LOW;
587 cec_queue_event_fh(fh, &ev, 0);
588 }
589 }
590 #endif
591
592 list_add(&fh->list, &devnode->fhs);
593 mutex_unlock(&devnode->lock);
594
595 return 0;
596 }
597
598 /* Override for the release function */
cec_release(struct inode * inode,struct file * filp)599 static int cec_release(struct inode *inode, struct file *filp)
600 {
601 struct cec_devnode *devnode = cec_devnode_data(filp);
602 struct cec_adapter *adap = to_cec_adapter(devnode);
603 struct cec_fh *fh = filp->private_data;
604 unsigned int i;
605
606 mutex_lock(&adap->lock);
607 if (adap->cec_initiator == fh)
608 adap->cec_initiator = NULL;
609 if (adap->cec_follower == fh) {
610 adap->cec_follower = NULL;
611 adap->passthrough = false;
612 }
613 if (fh->mode_follower == CEC_MODE_FOLLOWER)
614 adap->follower_cnt--;
615 if (fh->mode_follower == CEC_MODE_MONITOR_PIN)
616 cec_monitor_pin_cnt_dec(adap);
617 if (fh->mode_follower == CEC_MODE_MONITOR_ALL)
618 cec_monitor_all_cnt_dec(adap);
619 mutex_unlock(&adap->lock);
620
621 mutex_lock(&devnode->lock);
622 list_del(&fh->list);
623 if (cec_is_registered(adap) && list_empty(&devnode->fhs) &&
624 !adap->needs_hpd && adap->phys_addr == CEC_PHYS_ADDR_INVALID) {
625 WARN_ON(adap->ops->adap_enable(adap, false));
626 }
627 mutex_unlock(&devnode->lock);
628
629 /* Unhook pending transmits from this filehandle. */
630 mutex_lock(&adap->lock);
631 while (!list_empty(&fh->xfer_list)) {
632 struct cec_data *data =
633 list_first_entry(&fh->xfer_list, struct cec_data, xfer_list);
634
635 data->blocking = false;
636 data->fh = NULL;
637 list_del(&data->xfer_list);
638 }
639 mutex_unlock(&adap->lock);
640 while (!list_empty(&fh->msgs)) {
641 struct cec_msg_entry *entry =
642 list_first_entry(&fh->msgs, struct cec_msg_entry, list);
643
644 list_del(&entry->list);
645 kfree(entry);
646 }
647 for (i = CEC_NUM_CORE_EVENTS; i < CEC_NUM_EVENTS; i++) {
648 while (!list_empty(&fh->events[i])) {
649 struct cec_event_entry *entry =
650 list_first_entry(&fh->events[i],
651 struct cec_event_entry, list);
652
653 list_del(&entry->list);
654 kfree(entry);
655 }
656 }
657 kfree(fh);
658
659 cec_put_device(devnode);
660 filp->private_data = NULL;
661 return 0;
662 }
663
664 const struct file_operations cec_devnode_fops = {
665 .owner = THIS_MODULE,
666 .open = cec_open,
667 .unlocked_ioctl = cec_ioctl,
668 .release = cec_release,
669 .poll = cec_poll,
670 .llseek = no_llseek,
671 };
672
