drivers/media/cec/cec-api.c

   1 /*
   2  * cec-api.c - HDMI Consumer Electronics Control framework - API
   3  *
   4  * Copyright 2016 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
   5  *
   6  * This program is free software; you may redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; version 2 of the License.
   9  *
  10  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  11  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  12  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  13  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  14  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  15  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  16  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  17  * SOFTWARE.
  18  */
  19
  20 #include <linux/errno.h>
  21 #include <linux/init.h>
  22 #include <linux/module.h>
  23 #include <linux/kernel.h>
  24 #include <linux/kmod.h>
  25 #include <linux/ktime.h>
  26 #include <linux/slab.h>
  27 #include <linux/mm.h>
  28 #include <linux/string.h>
  29 #include <linux/types.h>
  30 #include <linux/uaccess.h>
  31 #include <linux/version.h>
  32
  33 #include <media/cec-pin.h>
  34 #include "cec-priv.h"
  35 #include "cec-pin-priv.h"
  36
  37 static inline struct cec_devnode *cec_devnode_data(struct file *filp)
  38 {
  39         struct cec_fh *fh = filp->private_data;
  40
  41         return &fh->adap->devnode;
  42 }
  43
  44 /* CEC file operations */
  45
  46 static unsigned int cec_poll(struct file *filp,
  47                              struct poll_table_struct *poll)
  48 {
  49         struct cec_devnode *devnode = cec_devnode_data(filp);
  50         struct cec_fh *fh = filp->private_data;
  51         struct cec_adapter *adap = fh->adap;
  52         unsigned int res = 0;
  53
  54         if (!devnode->registered)
  55                 return POLLERR | POLLHUP;
  56         mutex_lock(&adap->lock);
  57         if (adap->is_configured &&
  58             adap->transmit_queue_sz < CEC_MAX_MSG_TX_QUEUE_SZ)
  59                 res |= POLLOUT | POLLWRNORM;
  60         if (fh->queued_msgs)
  61                 res |= POLLIN | POLLRDNORM;
  62         if (fh->total_queued_events)
  63                 res |= POLLPRI;
  64         poll_wait(filp, &fh->wait, poll);
  65         mutex_unlock(&adap->lock);
  66         return res;
  67 }
  68
  69 static bool cec_is_busy(const struct cec_adapter *adap,
  70                         const struct cec_fh *fh)
  71 {
  72         bool valid_initiator = adap->cec_initiator && adap->cec_initiator == fh;
  73         bool valid_follower = adap->cec_follower && adap->cec_follower == fh;
  74
  75         /*
  76          * Exclusive initiators and followers can always access the CEC adapter
  77          */
  78         if (valid_initiator || valid_follower)
  79                 return false;
  80         /*
  81          * All others can only access the CEC adapter if there is no
  82          * exclusive initiator and they are in INITIATOR mode.
  83          */
  84         return adap->cec_initiator ||
  85                fh->mode_initiator == CEC_MODE_NO_INITIATOR;
  86 }
  87
  88 static long cec_adap_g_caps(struct cec_adapter *adap,
  89                             struct cec_caps __user *parg)
  90 {
  91         struct cec_caps caps = {};
  92
  93         strlcpy(caps.driver, adap->devnode.dev.parent->driver->name,
  94                 sizeof(caps.driver));
  95         strlcpy(caps.name, adap->name, sizeof(caps.name));
  96         caps.available_log_addrs = adap->available_log_addrs;
  97         caps.capabilities = adap->capabilities;
  98         caps.version = LINUX_VERSION_CODE;
  99         if (copy_to_user(parg, &caps, sizeof(caps)))
 100                 return -EFAULT;
 101         return 0;
 102 }
 103
 104 static long cec_adap_g_phys_addr(struct cec_adapter *adap,
 105                                  __u16 __user *parg)
 106 {
 107         u16 phys_addr;
 108
 109         mutex_lock(&adap->lock);
 110         phys_addr = adap->phys_addr;
 111         mutex_unlock(&adap->lock);
 112         if (copy_to_user(parg, &phys_addr, sizeof(phys_addr)))
 113                 return -EFAULT;
 114         return 0;
 115 }
 116
 117 static long cec_adap_s_phys_addr(struct cec_adapter *adap, struct cec_fh *fh,
 118                                  bool block, __u16 __user *parg)
 119 {
 120         u16 phys_addr;
 121         long err;
 122
 123         if (!(adap->capabilities & CEC_CAP_PHYS_ADDR))
 124                 return -ENOTTY;
 125         if (copy_from_user(&phys_addr, parg, sizeof(phys_addr)))
 126                 return -EFAULT;
 127
 128         err = cec_phys_addr_validate(phys_addr, NULL, NULL);
 129         if (err)
 130                 return err;
 131         mutex_lock(&adap->lock);
 132         if (cec_is_busy(adap, fh))
 133                 err = -EBUSY;
 134         else
 135                 __cec_s_phys_addr(adap, phys_addr, block);
 136         mutex_unlock(&adap->lock);
 137         return err;
 138 }
 139
 140 static long cec_adap_g_log_addrs(struct cec_adapter *adap,
 141                                  struct cec_log_addrs __user *parg)
 142 {
 143         struct cec_log_addrs log_addrs;
 144
 145         mutex_lock(&adap->lock);
 146         log_addrs = adap->log_addrs;
 147         if (!adap->is_configured)
 148                 memset(log_addrs.log_addr, CEC_LOG_ADDR_INVALID,
 149                        sizeof(log_addrs.log_addr));
 150         mutex_unlock(&adap->lock);
 151
 152         if (copy_to_user(parg, &log_addrs, sizeof(log_addrs)))
 153                 return -EFAULT;
 154         return 0;
 155 }
 156
 157 static long cec_adap_s_log_addrs(struct cec_adapter *adap, struct cec_fh *fh,
 158                                  bool block, struct cec_log_addrs __user *parg)
 159 {
 160         struct cec_log_addrs log_addrs;
 161         long err = -EBUSY;
 162
 163         if (!(adap->capabilities & CEC_CAP_LOG_ADDRS))
 164                 return -ENOTTY;
 165         if (copy_from_user(&log_addrs, parg, sizeof(log_addrs)))
 166                 return -EFAULT;
 167         log_addrs.flags &= CEC_LOG_ADDRS_FL_ALLOW_UNREG_FALLBACK |
 168                            CEC_LOG_ADDRS_FL_ALLOW_RC_PASSTHRU |
 169                            CEC_LOG_ADDRS_FL_CDC_ONLY;
 170         mutex_lock(&adap->lock);
 171         if (!adap->is_configuring &&
 172             (!log_addrs.num_log_addrs || !adap->is_configured) &&
 173             !cec_is_busy(adap, fh)) {
 174                 err = __cec_s_log_addrs(adap, &log_addrs, block);
 175                 if (!err)
 176                         log_addrs = adap->log_addrs;
 177         }
 178         mutex_unlock(&adap->lock);
 179         if (err)
 180                 return err;
 181         if (copy_to_user(parg, &log_addrs, sizeof(log_addrs)))
 182                 return -EFAULT;
 183         return 0;
 184 }
 185
 186 static long cec_transmit(struct cec_adapter *adap, struct cec_fh *fh,
 187                          bool block, struct cec_msg __user *parg)
 188 {
 189         struct cec_msg msg = {};
 190         long err = 0;
 191
 192         if (!(adap->capabilities & CEC_CAP_TRANSMIT))
 193                 return -ENOTTY;
 194         if (copy_from_user(&msg, parg, sizeof(msg)))
 195                 return -EFAULT;
 196
 197         /* A CDC-Only device can only send CDC messages */
 198         if ((adap->log_addrs.flags & CEC_LOG_ADDRS_FL_CDC_ONLY) &&
 199             (msg.len == 1 || msg.msg[1] != CEC_MSG_CDC_MESSAGE))
 200                 return -EINVAL;
 201
 202         mutex_lock(&adap->lock);
 203         if (adap->log_addrs.num_log_addrs == 0)
 204                 err = -EPERM;
 205         else if (adap->is_configuring)
 206                 err = -ENONET;
 207         else if (!adap->is_configured &&
 208                  (adap->needs_hpd || msg.msg[0] != 0xf0))
 209                 err = -ENONET;
 210         else if (cec_is_busy(adap, fh))
 211                 err = -EBUSY;
 212         else
 213                 err = cec_transmit_msg_fh(adap, &msg, fh, block);
 214         mutex_unlock(&adap->lock);
 215         if (err)
 216                 return err;
 217         if (copy_to_user(parg, &msg, sizeof(msg)))
 218                 return -EFAULT;
 219         return 0;
 220 }
 221
 222 /* Called by CEC_RECEIVE: wait for a message to arrive */
 223 static int cec_receive_msg(struct cec_fh *fh, struct cec_msg *msg, bool block)
 224 {
 225         u32 timeout = msg->timeout;
 226         int res;
 227
 228         do {
 229                 mutex_lock(&fh->lock);
 230                 /* Are there received messages queued up? */
 231                 if (fh->queued_msgs) {
 232                         /* Yes, return the first one */
 233                         struct cec_msg_entry *entry =
 234                                 list_first_entry(&fh->msgs,
 235                                                  struct cec_msg_entry, list);
 236
 237                         list_del(&entry->list);
 238                         *msg = entry->msg;
 239                         kfree(entry);
 240                         fh->queued_msgs--;
 241                         mutex_unlock(&fh->lock);
 242                         /* restore original timeout value */
 243                         msg->timeout = timeout;
 244                         return 0;
 245                 }
 246
 247                 /* No, return EAGAIN in non-blocking mode or wait */
 248                 mutex_unlock(&fh->lock);
 249
 250                 /* Return when in non-blocking mode */
 251                 if (!block)
 252                         return -EAGAIN;
 253
 254                 if (msg->timeout) {
 255                         /* The user specified a timeout */
 256                         res = wait_event_interruptible_timeout(fh->wait,
 257                                                                fh->queued_msgs,
 258                                 msecs_to_jiffies(msg->timeout));
 259                         if (res == 0)
 260                                 res = -ETIMEDOUT;
 261                         else if (res > 0)
 262                                 res = 0;
 263                 } else {
 264                         /* Wait indefinitely */
 265                         res = wait_event_interruptible(fh->wait,
 266                                                        fh->queued_msgs);
 267                 }
 268                 /* Exit on error, otherwise loop to get the new message */
 269         } while (!res);
 270         return res;
 271 }
 272
 273 static long cec_receive(struct cec_adapter *adap, struct cec_fh *fh,
 274                         bool block, struct cec_msg __user *parg)
 275 {
 276         struct cec_msg msg = {};
 277         long err;
 278
 279         if (copy_from_user(&msg, parg, sizeof(msg)))
 280                 return -EFAULT;
 281
 282         err = cec_receive_msg(fh, &msg, block);
 283         if (err)
 284                 return err;
 285         msg.flags = 0;
 286         if (copy_to_user(parg, &msg, sizeof(msg)))
 287                 return -EFAULT;
 288         return 0;
 289 }
 290
 291 static long cec_dqevent(struct cec_adapter *adap, struct cec_fh *fh,
 292                         bool block, struct cec_event __user *parg)
 293 {
 294         struct cec_event_entry *ev = NULL;
 295         u64 ts = ~0ULL;
 296         unsigned int i;
 297         unsigned int ev_idx;
 298         long err = 0;
 299
 300         mutex_lock(&fh->lock);
 301         while (!fh->total_queued_events && block) {
 302                 mutex_unlock(&fh->lock);
 303                 err = wait_event_interruptible(fh->wait,
 304                                                fh->total_queued_events);
 305                 if (err)
 306                         return err;
 307                 mutex_lock(&fh->lock);
 308         }
 309
 310         /* Find the oldest event */
 311         for (i = 0; i < CEC_NUM_EVENTS; i++) {
 312                 struct cec_event_entry *entry =
 313                         list_first_entry_or_null(&fh->events[i],
 314                                                  struct cec_event_entry, list);
 315
 316                 if (entry && entry->ev.ts <= ts) {
 317                         ev = entry;
 318                         ev_idx = i;
 319                         ts = ev->ev.ts;
 320                 }
 321         }
 322
 323         if (!ev) {
 324                 err = -EAGAIN;
 325                 goto unlock;
 326         }
 327         list_del(&ev->list);
 328
 329         if (copy_to_user(parg, &ev->ev, sizeof(ev->ev)))
 330                 err = -EFAULT;
 331         if (ev_idx >= CEC_NUM_CORE_EVENTS)
 332                 kfree(ev);
 333         fh->queued_events[ev_idx]--;
 334         fh->total_queued_events--;
 335
 336 unlock:
 337         mutex_unlock(&fh->lock);
 338         return err;
 339 }
 340
 341 static long cec_g_mode(struct cec_adapter *adap, struct cec_fh *fh,
 342                        u32 __user *parg)
 343 {
 344         u32 mode = fh->mode_initiator | fh->mode_follower;
 345
 346         if (copy_to_user(parg, &mode, sizeof(mode)))
 347                 return -EFAULT;
 348         return 0;
 349 }
 350
 351 static long cec_s_mode(struct cec_adapter *adap, struct cec_fh *fh,
 352                        u32 __user *parg)
 353 {
 354         u32 mode;
 355         u8 mode_initiator;
 356         u8 mode_follower;
 357         long err = 0;
 358
 359         if (copy_from_user(&mode, parg, sizeof(mode)))
 360                 return -EFAULT;
 361         if (mode & ~(CEC_MODE_INITIATOR_MSK | CEC_MODE_FOLLOWER_MSK)) {
 362                 dprintk(1, "%s: invalid mode bits set\n", __func__);
 363                 return -EINVAL;
 364         }
 365
 366         mode_initiator = mode & CEC_MODE_INITIATOR_MSK;
 367         mode_follower = mode & CEC_MODE_FOLLOWER_MSK;
 368
 369         if (mode_initiator > CEC_MODE_EXCL_INITIATOR ||
 370             mode_follower > CEC_MODE_MONITOR_ALL) {
 371                 dprintk(1, "%s: unknown mode\n", __func__);
 372                 return -EINVAL;
 373         }
 374
 375         if (mode_follower == CEC_MODE_MONITOR_ALL &&
 376             !(adap->capabilities & CEC_CAP_MONITOR_ALL)) {
 377                 dprintk(1, "%s: MONITOR_ALL not supported\n", __func__);
 378                 return -EINVAL;
 379         }
 380
 381         if (mode_follower == CEC_MODE_MONITOR_PIN &&
 382             !(adap->capabilities & CEC_CAP_MONITOR_PIN)) {
 383                 dprintk(1, "%s: MONITOR_PIN not supported\n", __func__);
 384                 return -EINVAL;
 385         }
 386
 387         /* Follower modes should always be able to send CEC messages */
 388         if ((mode_initiator == CEC_MODE_NO_INITIATOR ||
 389              !(adap->capabilities & CEC_CAP_TRANSMIT)) &&
 390             mode_follower >= CEC_MODE_FOLLOWER &&
 391             mode_follower <= CEC_MODE_EXCL_FOLLOWER_PASSTHRU) {
 392                 dprintk(1, "%s: cannot transmit\n", __func__);
 393                 return -EINVAL;
 394         }
 395
 396         /* Monitor modes require CEC_MODE_NO_INITIATOR */
 397         if (mode_initiator && mode_follower >= CEC_MODE_MONITOR_PIN) {
 398                 dprintk(1, "%s: monitor modes require NO_INITIATOR\n",
 399                         __func__);
 400                 return -EINVAL;
 401         }
 402
 403         /* Monitor modes require CAP_NET_ADMIN */
 404         if (mode_follower >= CEC_MODE_MONITOR_PIN && !capable(CAP_NET_ADMIN))
 405                 return -EPERM;
 406
 407         mutex_lock(&adap->lock);
 408         /*
 409          * You can't become exclusive follower if someone else already
 410          * has that job.
 411          */
 412         if ((mode_follower == CEC_MODE_EXCL_FOLLOWER ||
 413              mode_follower == CEC_MODE_EXCL_FOLLOWER_PASSTHRU) &&
 414             adap->cec_follower && adap->cec_follower != fh)
 415                 err = -EBUSY;
 416         /*
 417          * You can't become exclusive initiator if someone else already
 418          * has that job.
 419          */
 420         if (mode_initiator == CEC_MODE_EXCL_INITIATOR &&
 421             adap->cec_initiator && adap->cec_initiator != fh)
 422                 err = -EBUSY;
 423
 424         if (!err) {
 425                 bool old_mon_all = fh->mode_follower == CEC_MODE_MONITOR_ALL;
 426                 bool new_mon_all = mode_follower == CEC_MODE_MONITOR_ALL;
 427
 428                 if (old_mon_all != new_mon_all) {
 429                         if (new_mon_all)
 430                                 err = cec_monitor_all_cnt_inc(adap);
 431                         else
 432                                 cec_monitor_all_cnt_dec(adap);
 433                 }
 434         }
 435
 436         if (err) {
 437                 mutex_unlock(&adap->lock);
 438                 return err;
 439         }
 440
 441         if (fh->mode_follower == CEC_MODE_FOLLOWER)
 442                 adap->follower_cnt--;
 443         if (fh->mode_follower == CEC_MODE_MONITOR_PIN)
 444                 adap->monitor_pin_cnt--;
 445         if (mode_follower == CEC_MODE_FOLLOWER)
 446                 adap->follower_cnt++;
 447         if (mode_follower == CEC_MODE_MONITOR_PIN) {
 448                 struct cec_event ev = {
 449                         .flags = CEC_EVENT_FL_INITIAL_STATE,
 450                 };
 451
 452                 ev.event = adap->cec_pin_is_high ? CEC_EVENT_PIN_CEC_HIGH :
 453                                                    CEC_EVENT_PIN_CEC_LOW;
 454                 cec_queue_event_fh(fh, &ev, 0);
 455                 adap->monitor_pin_cnt++;
 456         }
 457         if (mode_follower == CEC_MODE_EXCL_FOLLOWER ||
 458             mode_follower == CEC_MODE_EXCL_FOLLOWER_PASSTHRU) {
 459                 adap->passthrough =
 460                         mode_follower == CEC_MODE_EXCL_FOLLOWER_PASSTHRU;
 461                 adap->cec_follower = fh;
 462         } else if (adap->cec_follower == fh) {
 463                 adap->passthrough = false;
 464                 adap->cec_follower = NULL;
 465         }
 466         if (mode_initiator == CEC_MODE_EXCL_INITIATOR)
 467                 adap->cec_initiator = fh;
 468         else if (adap->cec_initiator == fh)
 469                 adap->cec_initiator = NULL;
 470         fh->mode_initiator = mode_initiator;
 471         fh->mode_follower = mode_follower;
 472         mutex_unlock(&adap->lock);
 473         return 0;
 474 }
 475
 476 static long cec_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 477 {
 478         struct cec_devnode *devnode = cec_devnode_data(filp);
 479         struct cec_fh *fh = filp->private_data;
 480         struct cec_adapter *adap = fh->adap;
 481         bool block = !(filp->f_flags & O_NONBLOCK);
 482         void __user *parg = (void __user *)arg;
 483
 484         if (!devnode->registered)
 485                 return -ENODEV;
 486
 487         switch (cmd) {
 488         case CEC_ADAP_G_CAPS:
 489                 return cec_adap_g_caps(adap, parg);
 490
 491         case CEC_ADAP_G_PHYS_ADDR:
 492                 return cec_adap_g_phys_addr(adap, parg);
 493
 494         case CEC_ADAP_S_PHYS_ADDR:
 495                 return cec_adap_s_phys_addr(adap, fh, block, parg);
 496
 497         case CEC_ADAP_G_LOG_ADDRS:
 498                 return cec_adap_g_log_addrs(adap, parg);
 499
 500         case CEC_ADAP_S_LOG_ADDRS:
 501                 return cec_adap_s_log_addrs(adap, fh, block, parg);
 502
 503         case CEC_TRANSMIT:
 504                 return cec_transmit(adap, fh, block, parg);
 505
 506         case CEC_RECEIVE:
 507                 return cec_receive(adap, fh, block, parg);
 508
 509         case CEC_DQEVENT:
 510                 return cec_dqevent(adap, fh, block, parg);
 511
 512         case CEC_G_MODE:
 513                 return cec_g_mode(adap, fh, parg);
 514
 515         case CEC_S_MODE:
 516                 return cec_s_mode(adap, fh, parg);
 517
 518         default:
 519                 return -ENOTTY;
 520         }
 521 }
 522
 523 static int cec_open(struct inode *inode, struct file *filp)
 524 {
 525         struct cec_devnode *devnode =
 526                 container_of(inode->i_cdev, struct cec_devnode, cdev);
 527         struct cec_adapter *adap = to_cec_adapter(devnode);
 528         struct cec_fh *fh = kzalloc(sizeof(*fh), GFP_KERNEL);
 529         /*
 530          * Initial events that are automatically sent when the cec device is
 531          * opened.
 532          */
 533         struct cec_event ev = {
 534                 .event = CEC_EVENT_STATE_CHANGE,
 535                 .flags = CEC_EVENT_FL_INITIAL_STATE,
 536         };
 537         unsigned int i;
 538         int err;
 539
 540         if (!fh)
 541                 return -ENOMEM;
 542
 543         INIT_LIST_HEAD(&fh->msgs);
 544         INIT_LIST_HEAD(&fh->xfer_list);
 545         for (i = 0; i < CEC_NUM_EVENTS; i++)
 546                 INIT_LIST_HEAD(&fh->events[i]);
 547         mutex_init(&fh->lock);
 548         init_waitqueue_head(&fh->wait);
 549
 550         fh->mode_initiator = CEC_MODE_INITIATOR;
 551         fh->adap = adap;
 552
 553         err = cec_get_device(devnode);
 554         if (err) {
 555                 kfree(fh);
 556                 return err;
 557         }
 558
 559         mutex_lock(&devnode->lock);
 560         if (list_empty(&devnode->fhs) &&
 561             !adap->needs_hpd &&
 562             adap->phys_addr == CEC_PHYS_ADDR_INVALID) {
 563                 err = adap->ops->adap_enable(adap, true);
 564                 if (err) {
 565                         mutex_unlock(&devnode->lock);
 566                         kfree(fh);
 567                         return err;
 568                 }
 569         }
 570         filp->private_data = fh;
 571
 572         /* Queue up initial state events */
 573         ev.state_change.phys_addr = adap->phys_addr;
 574         ev.state_change.log_addr_mask = adap->log_addrs.log_addr_mask;
 575         cec_queue_event_fh(fh, &ev, 0);
 576 #ifdef CONFIG_CEC_PIN
 577         if (adap->pin && adap->pin->ops->read_hpd) {
 578                 err = adap->pin->ops->read_hpd(adap);
 579                 if (err >= 0) {
 580                         ev.event = err ? CEC_EVENT_PIN_HPD_HIGH :
 581                                          CEC_EVENT_PIN_HPD_LOW;
 582                         cec_queue_event_fh(fh, &ev, 0);
 583                 }
 584         }
 585 #endif
 586
 587         list_add(&fh->list, &devnode->fhs);
 588         mutex_unlock(&devnode->lock);
 589
 590         return 0;
 591 }
 592
 593 /* Override for the release function */
 594 static int cec_release(struct inode *inode, struct file *filp)
 595 {
 596         struct cec_devnode *devnode = cec_devnode_data(filp);
 597         struct cec_adapter *adap = to_cec_adapter(devnode);
 598         struct cec_fh *fh = filp->private_data;
 599         unsigned int i;
 600
 601         mutex_lock(&adap->lock);
 602         if (adap->cec_initiator == fh)
 603                 adap->cec_initiator = NULL;
 604         if (adap->cec_follower == fh) {
 605                 adap->cec_follower = NULL;
 606                 adap->passthrough = false;
 607         }
 608         if (fh->mode_follower == CEC_MODE_FOLLOWER)
 609                 adap->follower_cnt--;
 610         if (fh->mode_follower == CEC_MODE_MONITOR_PIN)
 611                 adap->monitor_pin_cnt--;
 612         if (fh->mode_follower == CEC_MODE_MONITOR_ALL)
 613                 cec_monitor_all_cnt_dec(adap);
 614         mutex_unlock(&adap->lock);
 615
 616         mutex_lock(&devnode->lock);
 617         list_del(&fh->list);
 618         if (list_empty(&devnode->fhs) &&
 619             !adap->needs_hpd &&
 620             adap->phys_addr == CEC_PHYS_ADDR_INVALID) {
 621                 WARN_ON(adap->ops->adap_enable(adap, false));
 622         }
 623         mutex_unlock(&devnode->lock);
 624
 625         /* Unhook pending transmits from this filehandle. */
 626         mutex_lock(&adap->lock);
 627         while (!list_empty(&fh->xfer_list)) {
 628                 struct cec_data *data =
 629                         list_first_entry(&fh->xfer_list, struct cec_data, xfer_list);
 630
 631                 data->blocking = false;
 632                 data->fh = NULL;
 633                 list_del(&data->xfer_list);
 634         }
 635         mutex_unlock(&adap->lock);
 636         while (!list_empty(&fh->msgs)) {
 637                 struct cec_msg_entry *entry =
 638                         list_first_entry(&fh->msgs, struct cec_msg_entry, list);
 639
 640                 list_del(&entry->list);
 641                 kfree(entry);
 642         }
 643         for (i = CEC_NUM_CORE_EVENTS; i < CEC_NUM_EVENTS; i++) {
 644                 while (!list_empty(&fh->events[i])) {
 645                         struct cec_event_entry *entry =
 646                                 list_first_entry(&fh->events[i],
 647                                                  struct cec_event_entry, list);
 648
 649                         list_del(&entry->list);
 650                         kfree(entry);
 651                 }
 652         }
 653         kfree(fh);
 654
 655         cec_put_device(devnode);
 656         filp->private_data = NULL;
 657         return 0;
 658 }
 659
 660 const struct file_operations cec_devnode_fops = {
 661         .owner = THIS_MODULE,
 662         .open = cec_open,
 663         .unlocked_ioctl = cec_ioctl,
 664         .release = cec_release,
 665         .poll = cec_poll,
 666         .llseek = no_llseek,
 667 };