drivers/media/cec/cec-api.c

   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
  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
  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         poll_wait(filp, &fh->wait, poll);
  42         if (!cec_is_registered(adap))
  43                 return EPOLLERR | EPOLLHUP;
  44         mutex_lock(&adap->lock);
  45         if (adap->is_configured &&
  46             adap->transmit_queue_sz < CEC_MAX_MSG_TX_QUEUE_SZ)
  47                 res |= EPOLLOUT | EPOLLWRNORM;
  48         if (fh->queued_msgs)
  49                 res |= EPOLLIN | EPOLLRDNORM;
  50         if (fh->total_queued_events)
  51                 res |= EPOLLPRI;
  52         mutex_unlock(&adap->lock);
  53         return res;
  54 }
  55
  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
  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         strscpy(caps.driver, adap->devnode.dev.parent->driver->name,
  81                 sizeof(caps.driver));
  82         strscpy(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
  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
 104 static int cec_validate_phys_addr(u16 phys_addr)
 105 {
 106         int i;
 107
 108         if (phys_addr == CEC_PHYS_ADDR_INVALID)
 109                 return 0;
 110         for (i = 0; i < 16; i += 4)
 111                 if (phys_addr & (0xf << i))
 112                         break;
 113         if (i == 16)
 114                 return 0;
 115         for (i += 4; i < 16; i += 4)
 116                 if ((phys_addr & (0xf << i)) == 0)
 117                         return -EINVAL;
 118         return 0;
 119 }
 120
 121 static long cec_adap_s_phys_addr(struct cec_adapter *adap, struct cec_fh *fh,
 122                                  bool block, __u16 __user *parg)
 123 {
 124         u16 phys_addr;
 125         long err;
 126
 127         if (!(adap->capabilities & CEC_CAP_PHYS_ADDR))
 128                 return -ENOTTY;
 129         if (copy_from_user(&phys_addr, parg, sizeof(phys_addr)))
 130                 return -EFAULT;
 131
 132         err = cec_validate_phys_addr(phys_addr);
 133         if (err)
 134                 return err;
 135         mutex_lock(&adap->lock);
 136         if (cec_is_busy(adap, fh))
 137                 err = -EBUSY;
 138         else
 139                 __cec_s_phys_addr(adap, phys_addr, block);
 140         mutex_unlock(&adap->lock);
 141         return err;
 142 }
 143
 144 static long cec_adap_g_log_addrs(struct cec_adapter *adap,
 145                                  struct cec_log_addrs __user *parg)
 146 {
 147         struct cec_log_addrs log_addrs;
 148
 149         mutex_lock(&adap->lock);
 150         log_addrs = adap->log_addrs;
 151         if (!adap->is_configured)
 152                 memset(log_addrs.log_addr, CEC_LOG_ADDR_INVALID,
 153                        sizeof(log_addrs.log_addr));
 154         mutex_unlock(&adap->lock);
 155
 156         if (copy_to_user(parg, &log_addrs, sizeof(log_addrs)))
 157                 return -EFAULT;
 158         return 0;
 159 }
 160
 161 static long cec_adap_s_log_addrs(struct cec_adapter *adap, struct cec_fh *fh,
 162                                  bool block, struct cec_log_addrs __user *parg)
 163 {
 164         struct cec_log_addrs log_addrs;
 165         long err = -EBUSY;
 166
 167         if (!(adap->capabilities & CEC_CAP_LOG_ADDRS))
 168                 return -ENOTTY;
 169         if (copy_from_user(&log_addrs, parg, sizeof(log_addrs)))
 170                 return -EFAULT;
 171         log_addrs.flags &= CEC_LOG_ADDRS_FL_ALLOW_UNREG_FALLBACK |
 172                            CEC_LOG_ADDRS_FL_ALLOW_RC_PASSTHRU |
 173                            CEC_LOG_ADDRS_FL_CDC_ONLY;
 174         mutex_lock(&adap->lock);
 175         if (!adap->is_configuring &&
 176             (!log_addrs.num_log_addrs || !adap->is_configured) &&
 177             !cec_is_busy(adap, fh)) {
 178                 err = __cec_s_log_addrs(adap, &log_addrs, block);
 179                 if (!err)
 180                         log_addrs = adap->log_addrs;
 181         }
 182         mutex_unlock(&adap->lock);
 183         if (err)
 184                 return err;
 185         if (copy_to_user(parg, &log_addrs, sizeof(log_addrs)))
 186                 return -EFAULT;
 187         return 0;
 188 }
 189
 190 static long cec_adap_g_connector_info(struct cec_adapter *adap,
 191                                       struct cec_log_addrs __user *parg)
 192 {
 193         int ret = 0;
 194
 195         if (!(adap->capabilities & CEC_CAP_CONNECTOR_INFO))
 196                 return -ENOTTY;
 197
 198         mutex_lock(&adap->lock);
 199         if (copy_to_user(parg, &adap->conn_info, sizeof(adap->conn_info)))
 200                 ret = -EFAULT;
 201         mutex_unlock(&adap->lock);
 202         return ret;
 203 }
 204
 205 static long cec_transmit(struct cec_adapter *adap, struct cec_fh *fh,
 206                          bool block, struct cec_msg __user *parg)
 207 {
 208         struct cec_msg msg = {};
 209         long err = 0;
 210
 211         if (!(adap->capabilities & CEC_CAP_TRANSMIT))
 212                 return -ENOTTY;
 213         if (copy_from_user(&msg, parg, sizeof(msg)))
 214                 return -EFAULT;
 215
 216         mutex_lock(&adap->lock);
 217         if (adap->log_addrs.num_log_addrs == 0)
 218                 err = -EPERM;
 219         else if (adap->is_configuring)
 220                 err = -ENONET;
 221         else if (cec_is_busy(adap, fh))
 222                 err = -EBUSY;
 223         else
 224                 err = cec_transmit_msg_fh(adap, &msg, fh, block);
 225         mutex_unlock(&adap->lock);
 226         if (err)
 227                 return err;
 228         if (copy_to_user(parg, &msg, sizeof(msg)))
 229                 return -EFAULT;
 230         return 0;
 231 }
 232
 233 /* Called by CEC_RECEIVE: wait for a message to arrive */
 234 static int cec_receive_msg(struct cec_fh *fh, struct cec_msg *msg, bool block)
 235 {
 236         u32 timeout = msg->timeout;
 237         int res;
 238
 239         do {
 240                 mutex_lock(&fh->lock);
 241                 /* Are there received messages queued up? */
 242                 if (fh->queued_msgs) {
 243                         /* Yes, return the first one */
 244                         struct cec_msg_entry *entry =
 245                                 list_first_entry(&fh->msgs,
 246                                                  struct cec_msg_entry, list);
 247
 248                         list_del(&entry->list);
 249                         *msg = entry->msg;
 250                         kfree(entry);
 251                         fh->queued_msgs--;
 252                         mutex_unlock(&fh->lock);
 253                         /* restore original timeout value */
 254                         msg->timeout = timeout;
 255                         return 0;
 256                 }
 257
 258                 /* No, return EAGAIN in non-blocking mode or wait */
 259                 mutex_unlock(&fh->lock);
 260
 261                 /* Return when in non-blocking mode */
 262                 if (!block)
 263                         return -EAGAIN;
 264
 265                 if (msg->timeout) {
 266                         /* The user specified a timeout */
 267                         res = wait_event_interruptible_timeout(fh->wait,
 268                                                                fh->queued_msgs,
 269                                 msecs_to_jiffies(msg->timeout));
 270                         if (res == 0)
 271                                 res = -ETIMEDOUT;
 272                         else if (res > 0)
 273                                 res = 0;
 274                 } else {
 275                         /* Wait indefinitely */
 276                         res = wait_event_interruptible(fh->wait,
 277                                                        fh->queued_msgs);
 278                 }
 279                 /* Exit on error, otherwise loop to get the new message */
 280         } while (!res);
 281         return res;
 282 }
 283
 284 static long cec_receive(struct cec_adapter *adap, struct cec_fh *fh,
 285                         bool block, struct cec_msg __user *parg)
 286 {
 287         struct cec_msg msg = {};
 288         long err;
 289
 290         if (copy_from_user(&msg, parg, sizeof(msg)))
 291                 return -EFAULT;
 292
 293         err = cec_receive_msg(fh, &msg, block);
 294         if (err)
 295                 return err;
 296         msg.flags = 0;
 297         if (copy_to_user(parg, &msg, sizeof(msg)))
 298                 return -EFAULT;
 299         return 0;
 300 }
 301
 302 static long cec_dqevent(struct cec_adapter *adap, struct cec_fh *fh,
 303                         bool block, struct cec_event __user *parg)
 304 {
 305         struct cec_event_entry *ev = NULL;
 306         u64 ts = ~0ULL;
 307         unsigned int i;
 308         unsigned int ev_idx;
 309         long err = 0;
 310
 311         mutex_lock(&fh->lock);
 312         while (!fh->total_queued_events && block) {
 313                 mutex_unlock(&fh->lock);
 314                 err = wait_event_interruptible(fh->wait,
 315                                                fh->total_queued_events);
 316                 if (err)
 317                         return err;
 318                 mutex_lock(&fh->lock);
 319         }
 320
 321         /* Find the oldest event */
 322         for (i = 0; i < CEC_NUM_EVENTS; i++) {
 323                 struct cec_event_entry *entry =
 324                         list_first_entry_or_null(&fh->events[i],
 325                                                  struct cec_event_entry, list);
 326
 327                 if (entry && entry->ev.ts <= ts) {
 328                         ev = entry;
 329                         ev_idx = i;
 330                         ts = ev->ev.ts;
 331                 }
 332         }
 333
 334         if (!ev) {
 335                 err = -EAGAIN;
 336                 goto unlock;
 337         }
 338         list_del(&ev->list);
 339
 340         if (copy_to_user(parg, &ev->ev, sizeof(ev->ev)))
 341                 err = -EFAULT;
 342         if (ev_idx >= CEC_NUM_CORE_EVENTS)
 343                 kfree(ev);
 344         fh->queued_events[ev_idx]--;
 345         fh->total_queued_events--;
 346
 347 unlock:
 348         mutex_unlock(&fh->lock);
 349         return err;
 350 }
 351
 352 static long cec_g_mode(struct cec_adapter *adap, struct cec_fh *fh,
 353                        u32 __user *parg)
 354 {
 355         u32 mode = fh->mode_initiator | fh->mode_follower;
 356
 357         if (copy_to_user(parg, &mode, sizeof(mode)))
 358                 return -EFAULT;
 359         return 0;
 360 }
 361
 362 static long cec_s_mode(struct cec_adapter *adap, struct cec_fh *fh,
 363                        u32 __user *parg)
 364 {
 365         u32 mode;
 366         u8 mode_initiator;
 367         u8 mode_follower;
 368         bool send_pin_event = false;
 369         long err = 0;
 370
 371         if (copy_from_user(&mode, parg, sizeof(mode)))
 372                 return -EFAULT;
 373         if (mode & ~(CEC_MODE_INITIATOR_MSK | CEC_MODE_FOLLOWER_MSK)) {
 374                 dprintk(1, "%s: invalid mode bits set\n", __func__);
 375                 return -EINVAL;
 376         }
 377
 378         mode_initiator = mode & CEC_MODE_INITIATOR_MSK;
 379         mode_follower = mode & CEC_MODE_FOLLOWER_MSK;
 380
 381         if (mode_initiator > CEC_MODE_EXCL_INITIATOR ||
 382             mode_follower > CEC_MODE_MONITOR_ALL) {
 383                 dprintk(1, "%s: unknown mode\n", __func__);
 384                 return -EINVAL;
 385         }
 386
 387         if (mode_follower == CEC_MODE_MONITOR_ALL &&
 388             !(adap->capabilities & CEC_CAP_MONITOR_ALL)) {
 389                 dprintk(1, "%s: MONITOR_ALL not supported\n", __func__);
 390                 return -EINVAL;
 391         }
 392
 393         if (mode_follower == CEC_MODE_MONITOR_PIN &&
 394             !(adap->capabilities & CEC_CAP_MONITOR_PIN)) {
 395                 dprintk(1, "%s: MONITOR_PIN not supported\n", __func__);
 396                 return -EINVAL;
 397         }
 398
 399         /* Follower modes should always be able to send CEC messages */
 400         if ((mode_initiator == CEC_MODE_NO_INITIATOR ||
 401              !(adap->capabilities & CEC_CAP_TRANSMIT)) &&
 402             mode_follower >= CEC_MODE_FOLLOWER &&
 403             mode_follower <= CEC_MODE_EXCL_FOLLOWER_PASSTHRU) {
 404                 dprintk(1, "%s: cannot transmit\n", __func__);
 405                 return -EINVAL;
 406         }
 407
 408         /* Monitor modes require CEC_MODE_NO_INITIATOR */
 409         if (mode_initiator && mode_follower >= CEC_MODE_MONITOR_PIN) {
 410                 dprintk(1, "%s: monitor modes require NO_INITIATOR\n",
 411                         __func__);
 412                 return -EINVAL;
 413         }
 414
 415         /* Monitor modes require CAP_NET_ADMIN */
 416         if (mode_follower >= CEC_MODE_MONITOR_PIN && !capable(CAP_NET_ADMIN))
 417                 return -EPERM;
 418
 419         mutex_lock(&adap->lock);
 420         /*
 421          * You can't become exclusive follower if someone else already
 422          * has that job.
 423          */
 424         if ((mode_follower == CEC_MODE_EXCL_FOLLOWER ||
 425              mode_follower == CEC_MODE_EXCL_FOLLOWER_PASSTHRU) &&
 426             adap->cec_follower && adap->cec_follower != fh)
 427                 err = -EBUSY;
 428         /*
 429          * You can't become exclusive initiator if someone else already
 430          * has that job.
 431          */
 432         if (mode_initiator == CEC_MODE_EXCL_INITIATOR &&
 433             adap->cec_initiator && adap->cec_initiator != fh)
 434                 err = -EBUSY;
 435
 436         if (!err) {
 437                 bool old_mon_all = fh->mode_follower == CEC_MODE_MONITOR_ALL;
 438                 bool new_mon_all = mode_follower == CEC_MODE_MONITOR_ALL;
 439
 440                 if (old_mon_all != new_mon_all) {
 441                         if (new_mon_all)
 442                                 err = cec_monitor_all_cnt_inc(adap);
 443                         else
 444                                 cec_monitor_all_cnt_dec(adap);
 445                 }
 446         }
 447
 448         if (!err) {
 449                 bool old_mon_pin = fh->mode_follower == CEC_MODE_MONITOR_PIN;
 450                 bool new_mon_pin = mode_follower == CEC_MODE_MONITOR_PIN;
 451
 452                 if (old_mon_pin != new_mon_pin) {
 453                         send_pin_event = new_mon_pin;
 454                         if (new_mon_pin)
 455                                 err = cec_monitor_pin_cnt_inc(adap);
 456                         else
 457                                 cec_monitor_pin_cnt_dec(adap);
 458                 }
 459         }
 460
 461         if (err) {
 462                 mutex_unlock(&adap->lock);
 463                 return err;
 464         }
 465
 466         if (fh->mode_follower == CEC_MODE_FOLLOWER)
 467                 adap->follower_cnt--;
 468         if (mode_follower == CEC_MODE_FOLLOWER)
 469                 adap->follower_cnt++;
 470         if (send_pin_event) {
 471                 struct cec_event ev = {
 472                         .flags = CEC_EVENT_FL_INITIAL_STATE,
 473                 };
 474
 475                 ev.event = adap->cec_pin_is_high ? CEC_EVENT_PIN_CEC_HIGH :
 476                                                    CEC_EVENT_PIN_CEC_LOW;
 477                 cec_queue_event_fh(fh, &ev, 0);
 478         }
 479         if (mode_follower == CEC_MODE_EXCL_FOLLOWER ||
 480             mode_follower == CEC_MODE_EXCL_FOLLOWER_PASSTHRU) {
 481                 adap->passthrough =
 482                         mode_follower == CEC_MODE_EXCL_FOLLOWER_PASSTHRU;
 483                 adap->cec_follower = fh;
 484         } else if (adap->cec_follower == fh) {
 485                 adap->passthrough = false;
 486                 adap->cec_follower = NULL;
 487         }
 488         if (mode_initiator == CEC_MODE_EXCL_INITIATOR)
 489                 adap->cec_initiator = fh;
 490         else if (adap->cec_initiator == fh)
 491                 adap->cec_initiator = NULL;
 492         fh->mode_initiator = mode_initiator;
 493         fh->mode_follower = mode_follower;
 494         mutex_unlock(&adap->lock);
 495         return 0;
 496 }
 497
 498 static long cec_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 499 {
 500         struct cec_fh *fh = filp->private_data;
 501         struct cec_adapter *adap = fh->adap;
 502         bool block = !(filp->f_flags & O_NONBLOCK);
 503         void __user *parg = (void __user *)arg;
 504
 505         if (!cec_is_registered(adap))
 506                 return -ENODEV;
 507
 508         switch (cmd) {
 509         case CEC_ADAP_G_CAPS:
 510                 return cec_adap_g_caps(adap, parg);
 511
 512         case CEC_ADAP_G_PHYS_ADDR:
 513                 return cec_adap_g_phys_addr(adap, parg);
 514
 515         case CEC_ADAP_S_PHYS_ADDR:
 516                 return cec_adap_s_phys_addr(adap, fh, block, parg);
 517
 518         case CEC_ADAP_G_LOG_ADDRS:
 519                 return cec_adap_g_log_addrs(adap, parg);
 520
 521         case CEC_ADAP_S_LOG_ADDRS:
 522                 return cec_adap_s_log_addrs(adap, fh, block, parg);
 523
 524         case CEC_ADAP_G_CONNECTOR_INFO:
 525                 return cec_adap_g_connector_info(adap, parg);
 526
 527         case CEC_TRANSMIT:
 528                 return cec_transmit(adap, fh, block, parg);
 529
 530         case CEC_RECEIVE:
 531                 return cec_receive(adap, fh, block, parg);
 532
 533         case CEC_DQEVENT:
 534                 return cec_dqevent(adap, fh, block, parg);
 535
 536         case CEC_G_MODE:
 537                 return cec_g_mode(adap, fh, parg);
 538
 539         case CEC_S_MODE:
 540                 return cec_s_mode(adap, fh, parg);
 541
 542         default:
 543                 return -ENOTTY;
 544         }
 545 }
 546
 547 static int cec_open(struct inode *inode, struct file *filp)
 548 {
 549         struct cec_devnode *devnode =
 550                 container_of(inode->i_cdev, struct cec_devnode, cdev);
 551         struct cec_adapter *adap = to_cec_adapter(devnode);
 552         struct cec_fh *fh = kzalloc(sizeof(*fh), GFP_KERNEL);
 553         /*
 554          * Initial events that are automatically sent when the cec device is
 555          * opened.
 556          */
 557         struct cec_event ev = {
 558                 .event = CEC_EVENT_STATE_CHANGE,
 559                 .flags = CEC_EVENT_FL_INITIAL_STATE,
 560         };
 561         unsigned int i;
 562         int err;
 563
 564         if (!fh)
 565                 return -ENOMEM;
 566
 567         INIT_LIST_HEAD(&fh->msgs);
 568         INIT_LIST_HEAD(&fh->xfer_list);
 569         for (i = 0; i < CEC_NUM_EVENTS; i++)
 570                 INIT_LIST_HEAD(&fh->events[i]);
 571         mutex_init(&fh->lock);
 572         init_waitqueue_head(&fh->wait);
 573
 574         fh->mode_initiator = CEC_MODE_INITIATOR;
 575         fh->adap = adap;
 576
 577         err = cec_get_device(devnode);
 578         if (err) {
 579                 kfree(fh);
 580                 return err;
 581         }
 582
 583         mutex_lock(&devnode->lock);
 584         if (list_empty(&devnode->fhs) &&
 585             !adap->needs_hpd &&
 586             adap->phys_addr == CEC_PHYS_ADDR_INVALID) {
 587                 err = adap->ops->adap_enable(adap, true);
 588                 if (err) {
 589                         mutex_unlock(&devnode->lock);
 590                         kfree(fh);
 591                         return err;
 592                 }
 593         }
 594         filp->private_data = fh;
 595
 596         /* Queue up initial state events */
 597         ev.state_change.phys_addr = adap->phys_addr;
 598         ev.state_change.log_addr_mask = adap->log_addrs.log_addr_mask;
 599         ev.state_change.have_conn_info =
 600                 adap->conn_info.type != CEC_CONNECTOR_TYPE_NO_CONNECTOR;
 601         cec_queue_event_fh(fh, &ev, 0);
 602 #ifdef CONFIG_CEC_PIN
 603         if (adap->pin && adap->pin->ops->read_hpd) {
 604                 err = adap->pin->ops->read_hpd(adap);
 605                 if (err >= 0) {
 606                         ev.event = err ? CEC_EVENT_PIN_HPD_HIGH :
 607                                          CEC_EVENT_PIN_HPD_LOW;
 608                         cec_queue_event_fh(fh, &ev, 0);
 609                 }
 610         }
 611         if (adap->pin && adap->pin->ops->read_5v) {
 612                 err = adap->pin->ops->read_5v(adap);
 613                 if (err >= 0) {
 614                         ev.event = err ? CEC_EVENT_PIN_5V_HIGH :
 615                                          CEC_EVENT_PIN_5V_LOW;
 616                         cec_queue_event_fh(fh, &ev, 0);
 617                 }
 618         }
 619 #endif
 620
 621         list_add(&fh->list, &devnode->fhs);
 622         mutex_unlock(&devnode->lock);
 623
 624         return 0;
 625 }
 626
 627 /* Override for the release function */
 628 static int cec_release(struct inode *inode, struct file *filp)
 629 {
 630         struct cec_devnode *devnode = cec_devnode_data(filp);
 631         struct cec_adapter *adap = to_cec_adapter(devnode);
 632         struct cec_fh *fh = filp->private_data;
 633         unsigned int i;
 634
 635         mutex_lock(&adap->lock);
 636         if (adap->cec_initiator == fh)
 637                 adap->cec_initiator = NULL;
 638         if (adap->cec_follower == fh) {
 639                 adap->cec_follower = NULL;
 640                 adap->passthrough = false;
 641         }
 642         if (fh->mode_follower == CEC_MODE_FOLLOWER)
 643                 adap->follower_cnt--;
 644         if (fh->mode_follower == CEC_MODE_MONITOR_PIN)
 645                 cec_monitor_pin_cnt_dec(adap);
 646         if (fh->mode_follower == CEC_MODE_MONITOR_ALL)
 647                 cec_monitor_all_cnt_dec(adap);
 648         mutex_unlock(&adap->lock);
 649
 650         mutex_lock(&devnode->lock);
 651         list_del(&fh->list);
 652         if (cec_is_registered(adap) && list_empty(&devnode->fhs) &&
 653             !adap->needs_hpd && adap->phys_addr == CEC_PHYS_ADDR_INVALID) {
 654                 WARN_ON(adap->ops->adap_enable(adap, false));
 655         }
 656         mutex_unlock(&devnode->lock);
 657
 658         /* Unhook pending transmits from this filehandle. */
 659         mutex_lock(&adap->lock);
 660         while (!list_empty(&fh->xfer_list)) {
 661                 struct cec_data *data =
 662                         list_first_entry(&fh->xfer_list, struct cec_data, xfer_list);
 663
 664                 data->blocking = false;
 665                 data->fh = NULL;
 666                 list_del(&data->xfer_list);
 667         }
 668         mutex_unlock(&adap->lock);
 669         while (!list_empty(&fh->msgs)) {
 670                 struct cec_msg_entry *entry =
 671                         list_first_entry(&fh->msgs, struct cec_msg_entry, list);
 672
 673                 list_del(&entry->list);
 674                 kfree(entry);
 675         }
 676         for (i = CEC_NUM_CORE_EVENTS; i < CEC_NUM_EVENTS; i++) {
 677                 while (!list_empty(&fh->events[i])) {
 678                         struct cec_event_entry *entry =
 679                                 list_first_entry(&fh->events[i],
 680                                                  struct cec_event_entry, list);
 681
 682                         list_del(&entry->list);
 683                         kfree(entry);
 684                 }
 685         }
 686         kfree(fh);
 687
 688         cec_put_device(devnode);
 689         filp->private_data = NULL;
 690         return 0;
 691 }
 692
 693 const struct file_operations cec_devnode_fops = {
 694         .owner = THIS_MODULE,
 695         .open = cec_open,
 696         .unlocked_ioctl = cec_ioctl,
 697         .compat_ioctl = cec_ioctl,
 698         .release = cec_release,
 699         .poll = cec_poll,
 700         .llseek = no_llseek,
 701 };