drivers/staging/most/aim-v4l2/video.c

   1 /*
   2  * V4L2 AIM - V4L2 Application Interface Module for MostCore
   3  *
   4  * Copyright (C) 2015, Microchip Technology Germany II GmbH & Co. KG
   5  *
   6  * This program is distributed in the hope that it will be useful,
   7  * but WITHOUT ANY WARRANTY; without even the implied warranty of
   8  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   9  * GNU General Public License for more details.
  10  *
  11  * This file is licensed under GPLv2.
  12  */
  13
  14 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  15
  16 #include <linux/module.h>
  17 #include <linux/slab.h>
  18 #include <linux/init.h>
  19 #include <linux/device.h>
  20 #include <linux/suspend.h>
  21 #include <linux/videodev2.h>
  22 #include <linux/mutex.h>
  23 #include <media/v4l2-common.h>
  24 #include <media/v4l2-ioctl.h>
  25 #include <media/v4l2-event.h>
  26 #include <media/v4l2-device.h>
  27 #include <media/v4l2-ctrls.h>
  28 #include <media/v4l2-fh.h>
  29
  30 #include "mostcore.h"
  31
  32 #define V4L2_AIM_MAX_INPUT  1
  33
  34 static struct most_aim aim_info;
  35
  36 struct most_video_dev {
  37         struct most_interface *iface;
  38         int ch_idx;
  39         struct list_head list;
  40         bool mute;
  41
  42         struct list_head pending_mbos;
  43         spinlock_t list_lock;
  44
  45         struct v4l2_device v4l2_dev;
  46         atomic_t access_ref;
  47         struct video_device *vdev;
  48         unsigned int ctrl_input;
  49
  50         struct mutex lock;
  51
  52         wait_queue_head_t wait_data;
  53 };
  54
  55 struct aim_fh {
  56         /* must be the first field of this struct! */
  57         struct v4l2_fh fh;
  58         struct most_video_dev *mdev;
  59         u32 offs;
  60 };
  61
  62 static struct list_head video_devices = LIST_HEAD_INIT(video_devices);
  63 static struct spinlock list_lock;
  64
  65 static inline bool data_ready(struct most_video_dev *mdev)
  66 {
  67         return !list_empty(&mdev->pending_mbos);
  68 }
  69
  70 static inline struct mbo *get_top_mbo(struct most_video_dev *mdev)
  71 {
  72         return list_first_entry(&mdev->pending_mbos, struct mbo, list);
  73 }
  74
  75 static int aim_vdev_open(struct file *filp)
  76 {
  77         int ret;
  78         struct video_device *vdev = video_devdata(filp);
  79         struct most_video_dev *mdev = video_drvdata(filp);
  80         struct aim_fh *fh;
  81
  82         v4l2_info(&mdev->v4l2_dev, "aim_vdev_open()\n");
  83
  84         switch (vdev->vfl_type) {
  85         case VFL_TYPE_GRABBER:
  86                 break;
  87         default:
  88                 return -EINVAL;
  89         }
  90
  91         fh = kzalloc(sizeof(*fh), GFP_KERNEL);
  92         if (!fh)
  93                 return -ENOMEM;
  94
  95         if (!atomic_inc_and_test(&mdev->access_ref)) {
  96                 v4l2_err(&mdev->v4l2_dev, "too many clients\n");
  97                 ret = -EBUSY;
  98                 goto err_dec;
  99         }
 100
 101         fh->mdev = mdev;
 102         v4l2_fh_init(&fh->fh, vdev);
 103         filp->private_data = fh;
 104
 105         v4l2_fh_add(&fh->fh);
 106
 107         ret = most_start_channel(mdev->iface, mdev->ch_idx, &aim_info);
 108         if (ret) {
 109                 v4l2_err(&mdev->v4l2_dev, "most_start_channel() failed\n");
 110                 goto err_rm;
 111         }
 112
 113         return 0;
 114
 115 err_rm:
 116         v4l2_fh_del(&fh->fh);
 117         v4l2_fh_exit(&fh->fh);
 118
 119 err_dec:
 120         atomic_dec(&mdev->access_ref);
 121         kfree(fh);
 122         return ret;
 123 }
 124
 125 static int aim_vdev_close(struct file *filp)
 126 {
 127         struct aim_fh *fh = filp->private_data;
 128         struct most_video_dev *mdev = fh->mdev;
 129         struct mbo *mbo, *tmp;
 130
 131         v4l2_info(&mdev->v4l2_dev, "aim_vdev_close()\n");
 132
 133         /*
 134          * We need to put MBOs back before we call most_stop_channel()
 135          * to deallocate MBOs.
 136          * From the other hand mostcore still calling rx_completion()
 137          * to deliver MBOs until most_stop_channel() is called.
 138          * Use mute to work around this issue.
 139          * This must be implemented in core.
 140          */
 141
 142         spin_lock_irq(&mdev->list_lock);
 143         mdev->mute = true;
 144         list_for_each_entry_safe(mbo, tmp, &mdev->pending_mbos, list) {
 145                 list_del(&mbo->list);
 146                 spin_unlock_irq(&mdev->list_lock);
 147                 most_put_mbo(mbo);
 148                 spin_lock_irq(&mdev->list_lock);
 149         }
 150         spin_unlock_irq(&mdev->list_lock);
 151         most_stop_channel(mdev->iface, mdev->ch_idx, &aim_info);
 152         mdev->mute = false;
 153
 154         v4l2_fh_del(&fh->fh);
 155         v4l2_fh_exit(&fh->fh);
 156
 157         atomic_dec(&mdev->access_ref);
 158         kfree(fh);
 159         return 0;
 160 }
 161
 162 static ssize_t aim_vdev_read(struct file *filp, char __user *buf,
 163                              size_t count, loff_t *pos)
 164 {
 165         struct aim_fh *fh = filp->private_data;
 166         struct most_video_dev *mdev = fh->mdev;
 167         int ret = 0;
 168
 169         if (*pos)
 170                 return -ESPIPE;
 171
 172         if (!mdev)
 173                 return -ENODEV;
 174
 175         /* wait for the first buffer */
 176         if (!(filp->f_flags & O_NONBLOCK)) {
 177                 if (wait_event_interruptible(mdev->wait_data, data_ready(mdev)))
 178                         return -ERESTARTSYS;
 179         }
 180
 181         if (!data_ready(mdev))
 182                 return -EAGAIN;
 183
 184         while (count > 0 && data_ready(mdev)) {
 185                 struct mbo *const mbo = get_top_mbo(mdev);
 186                 int const rem = mbo->processed_length - fh->offs;
 187                 int const cnt = rem < count ? rem : count;
 188
 189                 if (copy_to_user(buf, mbo->virt_address + fh->offs, cnt)) {
 190                         v4l2_err(&mdev->v4l2_dev, "read: copy_to_user failed\n");
 191                         if (!ret)
 192                                 ret = -EFAULT;
 193                         return ret;
 194                 }
 195
 196                 fh->offs += cnt;
 197                 count -= cnt;
 198                 buf += cnt;
 199                 ret += cnt;
 200
 201                 if (cnt >= rem) {
 202                         fh->offs = 0;
 203                         spin_lock_irq(&mdev->list_lock);
 204                         list_del(&mbo->list);
 205                         spin_unlock_irq(&mdev->list_lock);
 206                         most_put_mbo(mbo);
 207                 }
 208         }
 209         return ret;
 210 }
 211
 212 static unsigned int aim_vdev_poll(struct file *filp, poll_table *wait)
 213 {
 214         struct aim_fh *fh = filp->private_data;
 215         struct most_video_dev *mdev = fh->mdev;
 216         unsigned int mask = 0;
 217
 218         /* only wait if no data is available */
 219         if (!data_ready(mdev))
 220                 poll_wait(filp, &mdev->wait_data, wait);
 221         if (data_ready(mdev))
 222                 mask |= POLLIN | POLLRDNORM;
 223
 224         return mask;
 225 }
 226
 227 static void aim_set_format_struct(struct v4l2_format *f)
 228 {
 229         f->fmt.pix.width = 8;
 230         f->fmt.pix.height = 8;
 231         f->fmt.pix.pixelformat = V4L2_PIX_FMT_MPEG;
 232         f->fmt.pix.bytesperline = 0;
 233         f->fmt.pix.sizeimage = 188 * 2;
 234         f->fmt.pix.colorspace = V4L2_COLORSPACE_REC709;
 235         f->fmt.pix.field = V4L2_FIELD_NONE;
 236         f->fmt.pix.priv = 0;
 237 }
 238
 239 static int aim_set_format(struct most_video_dev *mdev, unsigned int cmd,
 240                           struct v4l2_format *format)
 241 {
 242         if (format->fmt.pix.pixelformat != V4L2_PIX_FMT_MPEG)
 243                 return -EINVAL;
 244
 245         if (cmd == VIDIOC_TRY_FMT)
 246                 return 0;
 247
 248         aim_set_format_struct(format);
 249
 250         return 0;
 251 }
 252
 253 static int vidioc_querycap(struct file *file, void *priv,
 254                            struct v4l2_capability *cap)
 255 {
 256         struct aim_fh *fh = priv;
 257         struct most_video_dev *mdev = fh->mdev;
 258
 259         v4l2_info(&mdev->v4l2_dev, "vidioc_querycap()\n");
 260
 261         strlcpy(cap->driver, "v4l2_most_aim", sizeof(cap->driver));
 262         strlcpy(cap->card, "MOST", sizeof(cap->card));
 263         snprintf(cap->bus_info, sizeof(cap->bus_info),
 264                  "%s", mdev->iface->description);
 265
 266         cap->capabilities =
 267                 V4L2_CAP_READWRITE |
 268                 V4L2_CAP_TUNER |
 269                 V4L2_CAP_VIDEO_CAPTURE;
 270         return 0;
 271 }
 272
 273 static int vidioc_enum_fmt_vid_cap(struct file *file, void *priv,
 274                                    struct v4l2_fmtdesc *f)
 275 {
 276         struct aim_fh *fh = priv;
 277         struct most_video_dev *mdev = fh->mdev;
 278
 279         v4l2_info(&mdev->v4l2_dev, "vidioc_enum_fmt_vid_cap() %d\n", f->index);
 280
 281         if (f->index)
 282                 return -EINVAL;
 283
 284         strcpy(f->description, "MPEG");
 285         f->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 286         f->flags = V4L2_FMT_FLAG_COMPRESSED;
 287         f->pixelformat = V4L2_PIX_FMT_MPEG;
 288
 289         return 0;
 290 }
 291
 292 static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
 293                                 struct v4l2_format *f)
 294 {
 295         struct aim_fh *fh = priv;
 296         struct most_video_dev *mdev = fh->mdev;
 297
 298         v4l2_info(&mdev->v4l2_dev, "vidioc_g_fmt_vid_cap()\n");
 299
 300         aim_set_format_struct(f);
 301         return 0;
 302 }
 303
 304 static int vidioc_try_fmt_vid_cap(struct file *file, void *priv,
 305                                   struct v4l2_format *f)
 306 {
 307         struct aim_fh *fh = priv;
 308         struct most_video_dev *mdev = fh->mdev;
 309
 310         return aim_set_format(mdev, VIDIOC_TRY_FMT, f);
 311 }
 312
 313 static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
 314                                 struct v4l2_format *f)
 315 {
 316         struct aim_fh *fh = priv;
 317         struct most_video_dev *mdev = fh->mdev;
 318
 319         return aim_set_format(mdev, VIDIOC_S_FMT, f);
 320 }
 321
 322 static int vidioc_g_std(struct file *file, void *priv, v4l2_std_id *norm)
 323 {
 324         struct aim_fh *fh = priv;
 325         struct most_video_dev *mdev = fh->mdev;
 326
 327         v4l2_info(&mdev->v4l2_dev, "vidioc_g_std()\n");
 328
 329         *norm = V4L2_STD_UNKNOWN;
 330         return 0;
 331 }
 332
 333 static int vidioc_enum_input(struct file *file, void *priv,
 334                              struct v4l2_input *input)
 335 {
 336         struct aim_fh *fh = priv;
 337         struct most_video_dev *mdev = fh->mdev;
 338
 339         if (input->index >= V4L2_AIM_MAX_INPUT)
 340                 return -EINVAL;
 341
 342         strcpy(input->name, "MOST Video");
 343         input->type |= V4L2_INPUT_TYPE_CAMERA;
 344         input->audioset = 0;
 345
 346         input->std = mdev->vdev->tvnorms;
 347
 348         return 0;
 349 }
 350
 351 static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
 352 {
 353         struct aim_fh *fh = priv;
 354         struct most_video_dev *mdev = fh->mdev;
 355         *i = mdev->ctrl_input;
 356         return 0;
 357 }
 358
 359 static int vidioc_s_input(struct file *file, void *priv, unsigned int index)
 360 {
 361         struct aim_fh *fh = priv;
 362         struct most_video_dev *mdev = fh->mdev;
 363
 364         v4l2_info(&mdev->v4l2_dev, "vidioc_s_input(%d)\n", index);
 365
 366         if (index >= V4L2_AIM_MAX_INPUT)
 367                 return -EINVAL;
 368         mdev->ctrl_input = index;
 369         return 0;
 370 }
 371
 372 static const struct v4l2_file_operations aim_fops = {
 373         .owner      = THIS_MODULE,
 374         .open       = aim_vdev_open,
 375         .release    = aim_vdev_close,
 376         .read       = aim_vdev_read,
 377         .poll       = aim_vdev_poll,
 378         .unlocked_ioctl = video_ioctl2,
 379 };
 380
 381 static const struct v4l2_ioctl_ops video_ioctl_ops = {
 382         .vidioc_querycap            = vidioc_querycap,
 383         .vidioc_enum_fmt_vid_cap    = vidioc_enum_fmt_vid_cap,
 384         .vidioc_g_fmt_vid_cap       = vidioc_g_fmt_vid_cap,
 385         .vidioc_try_fmt_vid_cap     = vidioc_try_fmt_vid_cap,
 386         .vidioc_s_fmt_vid_cap       = vidioc_s_fmt_vid_cap,
 387         .vidioc_g_std               = vidioc_g_std,
 388         .vidioc_enum_input          = vidioc_enum_input,
 389         .vidioc_g_input             = vidioc_g_input,
 390         .vidioc_s_input             = vidioc_s_input,
 391 };
 392
 393 static const struct video_device aim_videodev_template = {
 394         .fops = &aim_fops,
 395         .release = video_device_release,
 396         .ioctl_ops = &video_ioctl_ops,
 397         .tvnorms = V4L2_STD_UNKNOWN,
 398 };
 399
 400 /**************************************************************************/
 401
 402 static struct most_video_dev *get_aim_dev(
 403         struct most_interface *iface, int channel_idx)
 404 {
 405         struct most_video_dev *mdev;
 406         unsigned long flags;
 407
 408         spin_lock_irqsave(&list_lock, flags);
 409         list_for_each_entry(mdev, &video_devices, list) {
 410                 if (mdev->iface == iface && mdev->ch_idx == channel_idx) {
 411                         spin_unlock_irqrestore(&list_lock, flags);
 412                         return mdev;
 413                 }
 414         }
 415         spin_unlock_irqrestore(&list_lock, flags);
 416         return NULL;
 417 }
 418
 419 static int aim_rx_data(struct mbo *mbo)
 420 {
 421         unsigned long flags;
 422         struct most_video_dev *mdev =
 423                 get_aim_dev(mbo->ifp, mbo->hdm_channel_id);
 424
 425         if (!mdev)
 426                 return -EIO;
 427
 428         spin_lock_irqsave(&mdev->list_lock, flags);
 429         if (unlikely(mdev->mute)) {
 430                 spin_unlock_irqrestore(&mdev->list_lock, flags);
 431                 return -EIO;
 432         }
 433
 434         list_add_tail(&mbo->list, &mdev->pending_mbos);
 435         spin_unlock_irqrestore(&mdev->list_lock, flags);
 436         wake_up_interruptible(&mdev->wait_data);
 437         return 0;
 438 }
 439
 440 static int aim_register_videodev(struct most_video_dev *mdev)
 441 {
 442         int ret;
 443
 444         v4l2_info(&mdev->v4l2_dev, "aim_register_videodev()\n");
 445
 446         init_waitqueue_head(&mdev->wait_data);
 447
 448         /* allocate and fill v4l2 video struct */
 449         mdev->vdev = video_device_alloc();
 450         if (!mdev->vdev)
 451                 return -ENOMEM;
 452
 453         /* Fill the video capture device struct */
 454         *mdev->vdev = aim_videodev_template;
 455         mdev->vdev->v4l2_dev = &mdev->v4l2_dev;
 456         mdev->vdev->lock = &mdev->lock;
 457         snprintf(mdev->vdev->name, sizeof(mdev->vdev->name), "MOST: %s",
 458                  mdev->v4l2_dev.name);
 459
 460         /* Register the v4l2 device */
 461         video_set_drvdata(mdev->vdev, mdev);
 462         ret = video_register_device(mdev->vdev, VFL_TYPE_GRABBER, -1);
 463         if (ret) {
 464                 v4l2_err(&mdev->v4l2_dev, "video_register_device failed (%d)\n",
 465                          ret);
 466                 video_device_release(mdev->vdev);
 467         }
 468
 469         return ret;
 470 }
 471
 472 static void aim_unregister_videodev(struct most_video_dev *mdev)
 473 {
 474         v4l2_info(&mdev->v4l2_dev, "aim_unregister_videodev()\n");
 475
 476         video_unregister_device(mdev->vdev);
 477 }
 478
 479 static void aim_v4l2_dev_release(struct v4l2_device *v4l2_dev)
 480 {
 481         struct most_video_dev *mdev =
 482                 container_of(v4l2_dev, struct most_video_dev, v4l2_dev);
 483
 484         v4l2_device_unregister(v4l2_dev);
 485         kfree(mdev);
 486 }
 487
 488 static int aim_probe_channel(struct most_interface *iface, int channel_idx,
 489                              struct most_channel_config *ccfg,
 490                              struct kobject *parent, char *name)
 491 {
 492         int ret;
 493         struct most_video_dev *mdev = get_aim_dev(iface, channel_idx);
 494
 495         pr_info("aim_probe_channel(%s)\n", name);
 496
 497         if (mdev) {
 498                 pr_err("channel already linked\n");
 499                 return -EEXIST;
 500         }
 501
 502         if (ccfg->direction != MOST_CH_RX) {
 503                 pr_err("wrong direction, expect rx\n");
 504                 return -EINVAL;
 505         }
 506
 507         if (ccfg->data_type != MOST_CH_SYNC &&
 508             ccfg->data_type != MOST_CH_ISOC) {
 509                 pr_err("wrong channel type, expect sync or isoc\n");
 510                 return -EINVAL;
 511         }
 512
 513         mdev = kzalloc(sizeof(*mdev), GFP_KERNEL);
 514         if (!mdev)
 515                 return -ENOMEM;
 516
 517         mutex_init(&mdev->lock);
 518         atomic_set(&mdev->access_ref, -1);
 519         spin_lock_init(&mdev->list_lock);
 520         INIT_LIST_HEAD(&mdev->pending_mbos);
 521         mdev->iface = iface;
 522         mdev->ch_idx = channel_idx;
 523         mdev->v4l2_dev.release = aim_v4l2_dev_release;
 524
 525         /* Create the v4l2_device */
 526         strlcpy(mdev->v4l2_dev.name, name, sizeof(mdev->v4l2_dev.name));
 527         ret = v4l2_device_register(NULL, &mdev->v4l2_dev);
 528         if (ret) {
 529                 pr_err("v4l2_device_register() failed\n");
 530                 kfree(mdev);
 531                 return ret;
 532         }
 533
 534         ret = aim_register_videodev(mdev);
 535         if (ret)
 536                 goto err_unreg;
 537
 538         spin_lock_irq(&list_lock);
 539         list_add(&mdev->list, &video_devices);
 540         spin_unlock_irq(&list_lock);
 541         v4l2_info(&mdev->v4l2_dev, "aim_probe_channel() done\n");
 542         return 0;
 543
 544 err_unreg:
 545         v4l2_device_disconnect(&mdev->v4l2_dev);
 546         v4l2_device_put(&mdev->v4l2_dev);
 547         return ret;
 548 }
 549
 550 static int aim_disconnect_channel(struct most_interface *iface,
 551                                   int channel_idx)
 552 {
 553         struct most_video_dev *mdev = get_aim_dev(iface, channel_idx);
 554
 555         if (!mdev) {
 556                 pr_err("no such channel is linked\n");
 557                 return -ENOENT;
 558         }
 559
 560         v4l2_info(&mdev->v4l2_dev, "aim_disconnect_channel()\n");
 561
 562         spin_lock_irq(&list_lock);
 563         list_del(&mdev->list);
 564         spin_unlock_irq(&list_lock);
 565
 566         aim_unregister_videodev(mdev);
 567         v4l2_device_disconnect(&mdev->v4l2_dev);
 568         v4l2_device_put(&mdev->v4l2_dev);
 569         return 0;
 570 }
 571
 572 static struct most_aim aim_info = {
 573         .name = "v4l",
 574         .probe_channel = aim_probe_channel,
 575         .disconnect_channel = aim_disconnect_channel,
 576         .rx_completion = aim_rx_data,
 577 };
 578
 579 static int __init aim_init(void)
 580 {
 581         spin_lock_init(&list_lock);
 582         return most_register_aim(&aim_info);
 583 }
 584
 585 static void __exit aim_exit(void)
 586 {
 587         struct most_video_dev *mdev, *tmp;
 588
 589         /*
 590          * As the mostcore currently doesn't call disconnect_channel()
 591          * for linked channels while we call most_deregister_aim()
 592          * we simulate this call here.
 593          * This must be fixed in core.
 594          */
 595         spin_lock_irq(&list_lock);
 596         list_for_each_entry_safe(mdev, tmp, &video_devices, list) {
 597                 list_del(&mdev->list);
 598                 spin_unlock_irq(&list_lock);
 599
 600                 aim_unregister_videodev(mdev);
 601                 v4l2_device_disconnect(&mdev->v4l2_dev);
 602                 v4l2_device_put(&mdev->v4l2_dev);
 603                 spin_lock_irq(&list_lock);
 604         }
 605         spin_unlock_irq(&list_lock);
 606
 607         most_deregister_aim(&aim_info);
 608         BUG_ON(!list_empty(&video_devices));
 609 }
 610
 611 module_init(aim_init);
 612 module_exit(aim_exit);
 613
 614 MODULE_DESCRIPTION("V4L2 Application Interface Module for MostCore");
 615 MODULE_AUTHOR("Andrey Shvetsov <andrey.shvetsov@k2l.de>");
 616 MODULE_LICENSE("GPL");