drivers/media/i2c/video-i2c.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * video-i2c.c - Support for I2C transport video devices
   4  *
   5  * Copyright (C) 2018 Matt Ranostay <matt.ranostay@konsulko.com>
   6  *
   7  * Supported:
   8  * - Panasonic AMG88xx Grid-Eye Sensors
   9  */
  10
  11 #include <linux/delay.h>
  12 #include <linux/freezer.h>
  13 #include <linux/hwmon.h>
  14 #include <linux/kthread.h>
  15 #include <linux/i2c.h>
  16 #include <linux/list.h>
  17 #include <linux/module.h>
  18 #include <linux/mutex.h>
  19 #include <linux/of_device.h>
  20 #include <linux/regmap.h>
  21 #include <linux/sched.h>
  22 #include <linux/slab.h>
  23 #include <linux/videodev2.h>
  24 #include <media/v4l2-common.h>
  25 #include <media/v4l2-device.h>
  26 #include <media/v4l2-event.h>
  27 #include <media/v4l2-fh.h>
  28 #include <media/v4l2-ioctl.h>
  29 #include <media/videobuf2-v4l2.h>
  30 #include <media/videobuf2-vmalloc.h>
  31
  32 #define VIDEO_I2C_DRIVER        "video-i2c"
  33
  34 struct video_i2c_chip;
  35
  36 struct video_i2c_buffer {
  37         struct vb2_v4l2_buffer vb;
  38         struct list_head list;
  39 };
  40
  41 struct video_i2c_data {
  42         struct regmap *regmap;
  43         const struct video_i2c_chip *chip;
  44         struct mutex lock;
  45         spinlock_t slock;
  46         unsigned int sequence;
  47         struct mutex queue_lock;
  48
  49         struct v4l2_device v4l2_dev;
  50         struct video_device vdev;
  51         struct vb2_queue vb_vidq;
  52
  53         struct task_struct *kthread_vid_cap;
  54         struct list_head vid_cap_active;
  55
  56         struct v4l2_fract frame_interval;
  57 };
  58
  59 static const struct v4l2_fmtdesc amg88xx_format = {
  60         .pixelformat = V4L2_PIX_FMT_Y12,
  61 };
  62
  63 static const struct v4l2_frmsize_discrete amg88xx_size = {
  64         .width = 8,
  65         .height = 8,
  66 };
  67
  68 static const struct regmap_config amg88xx_regmap_config = {
  69         .reg_bits = 8,
  70         .val_bits = 8,
  71         .max_register = 0xff
  72 };
  73
  74 struct video_i2c_chip {
  75         /* video dimensions */
  76         const struct v4l2_fmtdesc *format;
  77         const struct v4l2_frmsize_discrete *size;
  78
  79         /* available frame intervals */
  80         const struct v4l2_fract *frame_intervals;
  81         unsigned int num_frame_intervals;
  82
  83         /* pixel buffer size */
  84         unsigned int buffer_size;
  85
  86         /* pixel size in bits */
  87         unsigned int bpp;
  88
  89         const struct regmap_config *regmap_config;
  90
  91         /* setup function */
  92         int (*setup)(struct video_i2c_data *data);
  93
  94         /* xfer function */
  95         int (*xfer)(struct video_i2c_data *data, char *buf);
  96
  97         /* hwmon init function */
  98         int (*hwmon_init)(struct video_i2c_data *data);
  99 };
 100
 101 /* Frame rate register */
 102 #define AMG88XX_REG_FPSC        0x02
 103 #define AMG88XX_FPSC_1FPS               BIT(0)
 104
 105 /* Thermistor register */
 106 #define AMG88XX_REG_TTHL        0x0e
 107
 108 /* Temperature register */
 109 #define AMG88XX_REG_T01L        0x80
 110
 111 static int amg88xx_xfer(struct video_i2c_data *data, char *buf)
 112 {
 113         return regmap_bulk_read(data->regmap, AMG88XX_REG_T01L, buf,
 114                                 data->chip->buffer_size);
 115 }
 116
 117 static int amg88xx_setup(struct video_i2c_data *data)
 118 {
 119         unsigned int mask = AMG88XX_FPSC_1FPS;
 120         unsigned int val;
 121
 122         if (data->frame_interval.numerator == data->frame_interval.denominator)
 123                 val = mask;
 124         else
 125                 val = 0;
 126
 127         return regmap_update_bits(data->regmap, AMG88XX_REG_FPSC, mask, val);
 128 }
 129
 130 #if IS_ENABLED(CONFIG_HWMON)
 131
 132 static const u32 amg88xx_temp_config[] = {
 133         HWMON_T_INPUT,
 134         0
 135 };
 136
 137 static const struct hwmon_channel_info amg88xx_temp = {
 138         .type = hwmon_temp,
 139         .config = amg88xx_temp_config,
 140 };
 141
 142 static const struct hwmon_channel_info *amg88xx_info[] = {
 143         &amg88xx_temp,
 144         NULL
 145 };
 146
 147 static umode_t amg88xx_is_visible(const void *drvdata,
 148                                   enum hwmon_sensor_types type,
 149                                   u32 attr, int channel)
 150 {
 151         return 0444;
 152 }
 153
 154 static int amg88xx_read(struct device *dev, enum hwmon_sensor_types type,
 155                         u32 attr, int channel, long *val)
 156 {
 157         struct video_i2c_data *data = dev_get_drvdata(dev);
 158         __le16 buf;
 159         int tmp;
 160
 161         tmp = regmap_bulk_read(data->regmap, AMG88XX_REG_TTHL, &buf, 2);
 162         if (tmp)
 163                 return tmp;
 164
 165         tmp = le16_to_cpu(buf);
 166
 167         /*
 168          * Check for sign bit, this isn't a two's complement value but an
 169          * absolute temperature that needs to be inverted in the case of being
 170          * negative.
 171          */
 172         if (tmp & BIT(11))
 173                 tmp = -(tmp & 0x7ff);
 174
 175         *val = (tmp * 625) / 10;
 176
 177         return 0;
 178 }
 179
 180 static const struct hwmon_ops amg88xx_hwmon_ops = {
 181         .is_visible = amg88xx_is_visible,
 182         .read = amg88xx_read,
 183 };
 184
 185 static const struct hwmon_chip_info amg88xx_chip_info = {
 186         .ops = &amg88xx_hwmon_ops,
 187         .info = amg88xx_info,
 188 };
 189
 190 static int amg88xx_hwmon_init(struct video_i2c_data *data)
 191 {
 192         struct device *dev = regmap_get_device(data->regmap);
 193         void *hwmon = devm_hwmon_device_register_with_info(dev, "amg88xx", data,
 194                                                 &amg88xx_chip_info, NULL);
 195
 196         return PTR_ERR_OR_ZERO(hwmon);
 197 }
 198 #else
 199 #define amg88xx_hwmon_init      NULL
 200 #endif
 201
 202 #define AMG88XX         0
 203
 204 static const struct v4l2_fract amg88xx_frame_intervals[] = {
 205         { 1, 10 },
 206         { 1, 1 },
 207 };
 208
 209 static const struct video_i2c_chip video_i2c_chip[] = {
 210         [AMG88XX] = {
 211                 .size           = &amg88xx_size,
 212                 .format         = &amg88xx_format,
 213                 .frame_intervals        = amg88xx_frame_intervals,
 214                 .num_frame_intervals    = ARRAY_SIZE(amg88xx_frame_intervals),
 215                 .buffer_size    = 128,
 216                 .bpp            = 16,
 217                 .regmap_config  = &amg88xx_regmap_config,
 218                 .setup          = &amg88xx_setup,
 219                 .xfer           = &amg88xx_xfer,
 220                 .hwmon_init     = amg88xx_hwmon_init,
 221         },
 222 };
 223
 224 static const struct v4l2_file_operations video_i2c_fops = {
 225         .owner          = THIS_MODULE,
 226         .open           = v4l2_fh_open,
 227         .release        = vb2_fop_release,
 228         .poll           = vb2_fop_poll,
 229         .read           = vb2_fop_read,
 230         .mmap           = vb2_fop_mmap,
 231         .unlocked_ioctl = video_ioctl2,
 232 };
 233
 234 static int queue_setup(struct vb2_queue *vq,
 235                        unsigned int *nbuffers, unsigned int *nplanes,
 236                        unsigned int sizes[], struct device *alloc_devs[])
 237 {
 238         struct video_i2c_data *data = vb2_get_drv_priv(vq);
 239         unsigned int size = data->chip->buffer_size;
 240
 241         if (vq->num_buffers + *nbuffers < 2)
 242                 *nbuffers = 2;
 243
 244         if (*nplanes)
 245                 return sizes[0] < size ? -EINVAL : 0;
 246
 247         *nplanes = 1;
 248         sizes[0] = size;
 249
 250         return 0;
 251 }
 252
 253 static int buffer_prepare(struct vb2_buffer *vb)
 254 {
 255         struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
 256         struct video_i2c_data *data = vb2_get_drv_priv(vb->vb2_queue);
 257         unsigned int size = data->chip->buffer_size;
 258
 259         if (vb2_plane_size(vb, 0) < size)
 260                 return -EINVAL;
 261
 262         vbuf->field = V4L2_FIELD_NONE;
 263         vb2_set_plane_payload(vb, 0, size);
 264
 265         return 0;
 266 }
 267
 268 static void buffer_queue(struct vb2_buffer *vb)
 269 {
 270         struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
 271         struct video_i2c_data *data = vb2_get_drv_priv(vb->vb2_queue);
 272         struct video_i2c_buffer *buf =
 273                         container_of(vbuf, struct video_i2c_buffer, vb);
 274
 275         spin_lock(&data->slock);
 276         list_add_tail(&buf->list, &data->vid_cap_active);
 277         spin_unlock(&data->slock);
 278 }
 279
 280 static int video_i2c_thread_vid_cap(void *priv)
 281 {
 282         struct video_i2c_data *data = priv;
 283         unsigned int delay = mult_frac(HZ, data->frame_interval.numerator,
 284                                        data->frame_interval.denominator);
 285
 286         set_freezable();
 287
 288         do {
 289                 unsigned long start_jiffies = jiffies;
 290                 struct video_i2c_buffer *vid_cap_buf = NULL;
 291                 int schedule_delay;
 292
 293                 try_to_freeze();
 294
 295                 spin_lock(&data->slock);
 296
 297                 if (!list_empty(&data->vid_cap_active)) {
 298                         vid_cap_buf = list_last_entry(&data->vid_cap_active,
 299                                                  struct video_i2c_buffer, list);
 300                         list_del(&vid_cap_buf->list);
 301                 }
 302
 303                 spin_unlock(&data->slock);
 304
 305                 if (vid_cap_buf) {
 306                         struct vb2_buffer *vb2_buf = &vid_cap_buf->vb.vb2_buf;
 307                         void *vbuf = vb2_plane_vaddr(vb2_buf, 0);
 308                         int ret;
 309
 310                         ret = data->chip->xfer(data, vbuf);
 311                         vb2_buf->timestamp = ktime_get_ns();
 312                         vid_cap_buf->vb.sequence = data->sequence++;
 313                         vb2_buffer_done(vb2_buf, ret ?
 314                                 VB2_BUF_STATE_ERROR : VB2_BUF_STATE_DONE);
 315                 }
 316
 317                 schedule_delay = delay - (jiffies - start_jiffies);
 318
 319                 if (time_after(jiffies, start_jiffies + delay))
 320                         schedule_delay = delay;
 321
 322                 schedule_timeout_interruptible(schedule_delay);
 323         } while (!kthread_should_stop());
 324
 325         return 0;
 326 }
 327
 328 static void video_i2c_del_list(struct vb2_queue *vq, enum vb2_buffer_state state)
 329 {
 330         struct video_i2c_data *data = vb2_get_drv_priv(vq);
 331         struct video_i2c_buffer *buf, *tmp;
 332
 333         spin_lock(&data->slock);
 334
 335         list_for_each_entry_safe(buf, tmp, &data->vid_cap_active, list) {
 336                 list_del(&buf->list);
 337                 vb2_buffer_done(&buf->vb.vb2_buf, state);
 338         }
 339
 340         spin_unlock(&data->slock);
 341 }
 342
 343 static int start_streaming(struct vb2_queue *vq, unsigned int count)
 344 {
 345         struct video_i2c_data *data = vb2_get_drv_priv(vq);
 346         int ret;
 347
 348         if (data->kthread_vid_cap)
 349                 return 0;
 350
 351         ret = data->chip->setup(data);
 352         if (ret)
 353                 goto error_del_list;
 354
 355         data->sequence = 0;
 356         data->kthread_vid_cap = kthread_run(video_i2c_thread_vid_cap, data,
 357                                             "%s-vid-cap", data->v4l2_dev.name);
 358         ret = PTR_ERR_OR_ZERO(data->kthread_vid_cap);
 359         if (!ret)
 360                 return 0;
 361
 362 error_del_list:
 363         video_i2c_del_list(vq, VB2_BUF_STATE_QUEUED);
 364
 365         return ret;
 366 }
 367
 368 static void stop_streaming(struct vb2_queue *vq)
 369 {
 370         struct video_i2c_data *data = vb2_get_drv_priv(vq);
 371
 372         if (data->kthread_vid_cap == NULL)
 373                 return;
 374
 375         kthread_stop(data->kthread_vid_cap);
 376         data->kthread_vid_cap = NULL;
 377
 378         video_i2c_del_list(vq, VB2_BUF_STATE_ERROR);
 379 }
 380
 381 static const struct vb2_ops video_i2c_video_qops = {
 382         .queue_setup            = queue_setup,
 383         .buf_prepare            = buffer_prepare,
 384         .buf_queue              = buffer_queue,
 385         .start_streaming        = start_streaming,
 386         .stop_streaming         = stop_streaming,
 387         .wait_prepare           = vb2_ops_wait_prepare,
 388         .wait_finish            = vb2_ops_wait_finish,
 389 };
 390
 391 static int video_i2c_querycap(struct file *file, void  *priv,
 392                                 struct v4l2_capability *vcap)
 393 {
 394         struct video_i2c_data *data = video_drvdata(file);
 395         struct device *dev = regmap_get_device(data->regmap);
 396         struct i2c_client *client = to_i2c_client(dev);
 397
 398         strscpy(vcap->driver, data->v4l2_dev.name, sizeof(vcap->driver));
 399         strscpy(vcap->card, data->vdev.name, sizeof(vcap->card));
 400
 401         sprintf(vcap->bus_info, "I2C:%d-%d", client->adapter->nr, client->addr);
 402
 403         return 0;
 404 }
 405
 406 static int video_i2c_g_input(struct file *file, void *fh, unsigned int *inp)
 407 {
 408         *inp = 0;
 409
 410         return 0;
 411 }
 412
 413 static int video_i2c_s_input(struct file *file, void *fh, unsigned int inp)
 414 {
 415         return (inp > 0) ? -EINVAL : 0;
 416 }
 417
 418 static int video_i2c_enum_input(struct file *file, void *fh,
 419                                   struct v4l2_input *vin)
 420 {
 421         if (vin->index > 0)
 422                 return -EINVAL;
 423
 424         strscpy(vin->name, "Camera", sizeof(vin->name));
 425
 426         vin->type = V4L2_INPUT_TYPE_CAMERA;
 427
 428         return 0;
 429 }
 430
 431 static int video_i2c_enum_fmt_vid_cap(struct file *file, void *fh,
 432                                         struct v4l2_fmtdesc *fmt)
 433 {
 434         struct video_i2c_data *data = video_drvdata(file);
 435         enum v4l2_buf_type type = fmt->type;
 436
 437         if (fmt->index > 0)
 438                 return -EINVAL;
 439
 440         *fmt = *data->chip->format;
 441         fmt->type = type;
 442
 443         return 0;
 444 }
 445
 446 static int video_i2c_enum_framesizes(struct file *file, void *fh,
 447                                        struct v4l2_frmsizeenum *fsize)
 448 {
 449         const struct video_i2c_data *data = video_drvdata(file);
 450         const struct v4l2_frmsize_discrete *size = data->chip->size;
 451
 452         /* currently only one frame size is allowed */
 453         if (fsize->index > 0)
 454                 return -EINVAL;
 455
 456         if (fsize->pixel_format != data->chip->format->pixelformat)
 457                 return -EINVAL;
 458
 459         fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
 460         fsize->discrete.width = size->width;
 461         fsize->discrete.height = size->height;
 462
 463         return 0;
 464 }
 465
 466 static int video_i2c_enum_frameintervals(struct file *file, void *priv,
 467                                            struct v4l2_frmivalenum *fe)
 468 {
 469         const struct video_i2c_data *data = video_drvdata(file);
 470         const struct v4l2_frmsize_discrete *size = data->chip->size;
 471
 472         if (fe->index >= data->chip->num_frame_intervals)
 473                 return -EINVAL;
 474
 475         if (fe->width != size->width || fe->height != size->height)
 476                 return -EINVAL;
 477
 478         fe->type = V4L2_FRMIVAL_TYPE_DISCRETE;
 479         fe->discrete = data->chip->frame_intervals[fe->index];
 480
 481         return 0;
 482 }
 483
 484 static int video_i2c_try_fmt_vid_cap(struct file *file, void *fh,
 485                                        struct v4l2_format *fmt)
 486 {
 487         const struct video_i2c_data *data = video_drvdata(file);
 488         const struct v4l2_frmsize_discrete *size = data->chip->size;
 489         struct v4l2_pix_format *pix = &fmt->fmt.pix;
 490         unsigned int bpp = data->chip->bpp / 8;
 491
 492         pix->width = size->width;
 493         pix->height = size->height;
 494         pix->pixelformat = data->chip->format->pixelformat;
 495         pix->field = V4L2_FIELD_NONE;
 496         pix->bytesperline = pix->width * bpp;
 497         pix->sizeimage = pix->bytesperline * pix->height;
 498         pix->colorspace = V4L2_COLORSPACE_RAW;
 499
 500         return 0;
 501 }
 502
 503 static int video_i2c_s_fmt_vid_cap(struct file *file, void *fh,
 504                                      struct v4l2_format *fmt)
 505 {
 506         struct video_i2c_data *data = video_drvdata(file);
 507
 508         if (vb2_is_busy(&data->vb_vidq))
 509                 return -EBUSY;
 510
 511         return video_i2c_try_fmt_vid_cap(file, fh, fmt);
 512 }
 513
 514 static int video_i2c_g_parm(struct file *filp, void *priv,
 515                               struct v4l2_streamparm *parm)
 516 {
 517         struct video_i2c_data *data = video_drvdata(filp);
 518
 519         if (parm->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
 520                 return -EINVAL;
 521
 522         parm->parm.capture.readbuffers = 1;
 523         parm->parm.capture.capability = V4L2_CAP_TIMEPERFRAME;
 524         parm->parm.capture.timeperframe = data->frame_interval;
 525
 526         return 0;
 527 }
 528
 529 static int video_i2c_s_parm(struct file *filp, void *priv,
 530                               struct v4l2_streamparm *parm)
 531 {
 532         struct video_i2c_data *data = video_drvdata(filp);
 533         int i;
 534
 535         for (i = 0; i < data->chip->num_frame_intervals - 1; i++) {
 536                 if (V4L2_FRACT_COMPARE(parm->parm.capture.timeperframe, <=,
 537                                        data->chip->frame_intervals[i]))
 538                         break;
 539         }
 540         data->frame_interval = data->chip->frame_intervals[i];
 541
 542         return video_i2c_g_parm(filp, priv, parm);
 543 }
 544
 545 static const struct v4l2_ioctl_ops video_i2c_ioctl_ops = {
 546         .vidioc_querycap                = video_i2c_querycap,
 547         .vidioc_g_input                 = video_i2c_g_input,
 548         .vidioc_s_input                 = video_i2c_s_input,
 549         .vidioc_enum_input              = video_i2c_enum_input,
 550         .vidioc_enum_fmt_vid_cap        = video_i2c_enum_fmt_vid_cap,
 551         .vidioc_enum_framesizes         = video_i2c_enum_framesizes,
 552         .vidioc_enum_frameintervals     = video_i2c_enum_frameintervals,
 553         .vidioc_g_fmt_vid_cap           = video_i2c_try_fmt_vid_cap,
 554         .vidioc_s_fmt_vid_cap           = video_i2c_s_fmt_vid_cap,
 555         .vidioc_g_parm                  = video_i2c_g_parm,
 556         .vidioc_s_parm                  = video_i2c_s_parm,
 557         .vidioc_try_fmt_vid_cap         = video_i2c_try_fmt_vid_cap,
 558         .vidioc_reqbufs                 = vb2_ioctl_reqbufs,
 559         .vidioc_create_bufs             = vb2_ioctl_create_bufs,
 560         .vidioc_prepare_buf             = vb2_ioctl_prepare_buf,
 561         .vidioc_querybuf                = vb2_ioctl_querybuf,
 562         .vidioc_qbuf                    = vb2_ioctl_qbuf,
 563         .vidioc_dqbuf                   = vb2_ioctl_dqbuf,
 564         .vidioc_streamon                = vb2_ioctl_streamon,
 565         .vidioc_streamoff               = vb2_ioctl_streamoff,
 566 };
 567
 568 static void video_i2c_release(struct video_device *vdev)
 569 {
 570         struct video_i2c_data *data = video_get_drvdata(vdev);
 571
 572         v4l2_device_unregister(&data->v4l2_dev);
 573         mutex_destroy(&data->lock);
 574         mutex_destroy(&data->queue_lock);
 575         regmap_exit(data->regmap);
 576         kfree(data);
 577 }
 578
 579 static int video_i2c_probe(struct i2c_client *client,
 580                              const struct i2c_device_id *id)
 581 {
 582         struct video_i2c_data *data;
 583         struct v4l2_device *v4l2_dev;
 584         struct vb2_queue *queue;
 585         int ret = -ENODEV;
 586
 587         data = kzalloc(sizeof(*data), GFP_KERNEL);
 588         if (!data)
 589                 return -ENOMEM;
 590
 591         if (dev_fwnode(&client->dev))
 592                 data->chip = device_get_match_data(&client->dev);
 593         else if (id)
 594                 data->chip = &video_i2c_chip[id->driver_data];
 595         else
 596                 goto error_free_device;
 597
 598         data->regmap = regmap_init_i2c(client, data->chip->regmap_config);
 599         if (IS_ERR(data->regmap)) {
 600                 ret = PTR_ERR(data->regmap);
 601                 goto error_free_device;
 602         }
 603
 604         v4l2_dev = &data->v4l2_dev;
 605         strscpy(v4l2_dev->name, VIDEO_I2C_DRIVER, sizeof(v4l2_dev->name));
 606
 607         ret = v4l2_device_register(&client->dev, v4l2_dev);
 608         if (ret < 0)
 609                 goto error_regmap_exit;
 610
 611         mutex_init(&data->lock);
 612         mutex_init(&data->queue_lock);
 613
 614         queue = &data->vb_vidq;
 615         queue->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 616         queue->io_modes = VB2_DMABUF | VB2_MMAP | VB2_USERPTR | VB2_READ;
 617         queue->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
 618         queue->drv_priv = data;
 619         queue->buf_struct_size = sizeof(struct video_i2c_buffer);
 620         queue->min_buffers_needed = 1;
 621         queue->ops = &video_i2c_video_qops;
 622         queue->mem_ops = &vb2_vmalloc_memops;
 623
 624         ret = vb2_queue_init(queue);
 625         if (ret < 0)
 626                 goto error_unregister_device;
 627
 628         data->vdev.queue = queue;
 629         data->vdev.queue->lock = &data->queue_lock;
 630
 631         snprintf(data->vdev.name, sizeof(data->vdev.name),
 632                                  "I2C %d-%d Transport Video",
 633                                  client->adapter->nr, client->addr);
 634
 635         data->vdev.v4l2_dev = v4l2_dev;
 636         data->vdev.fops = &video_i2c_fops;
 637         data->vdev.lock = &data->lock;
 638         data->vdev.ioctl_ops = &video_i2c_ioctl_ops;
 639         data->vdev.release = video_i2c_release;
 640         data->vdev.device_caps = V4L2_CAP_VIDEO_CAPTURE |
 641                                  V4L2_CAP_READWRITE | V4L2_CAP_STREAMING;
 642
 643         spin_lock_init(&data->slock);
 644         INIT_LIST_HEAD(&data->vid_cap_active);
 645
 646         data->frame_interval = data->chip->frame_intervals[0];
 647
 648         video_set_drvdata(&data->vdev, data);
 649         i2c_set_clientdata(client, data);
 650
 651         if (data->chip->hwmon_init) {
 652                 ret = data->chip->hwmon_init(data);
 653                 if (ret < 0) {
 654                         dev_warn(&client->dev,
 655                                  "failed to register hwmon device\n");
 656                 }
 657         }
 658
 659         ret = video_register_device(&data->vdev, VFL_TYPE_GRABBER, -1);
 660         if (ret < 0)
 661                 goto error_unregister_device;
 662
 663         return 0;
 664
 665 error_unregister_device:
 666         v4l2_device_unregister(v4l2_dev);
 667         mutex_destroy(&data->lock);
 668         mutex_destroy(&data->queue_lock);
 669
 670 error_regmap_exit:
 671         regmap_exit(data->regmap);
 672
 673 error_free_device:
 674         kfree(data);
 675
 676         return ret;
 677 }
 678
 679 static int video_i2c_remove(struct i2c_client *client)
 680 {
 681         struct video_i2c_data *data = i2c_get_clientdata(client);
 682
 683         video_unregister_device(&data->vdev);
 684
 685         return 0;
 686 }
 687
 688 static const struct i2c_device_id video_i2c_id_table[] = {
 689         { "amg88xx", AMG88XX },
 690         {}
 691 };
 692 MODULE_DEVICE_TABLE(i2c, video_i2c_id_table);
 693
 694 static const struct of_device_id video_i2c_of_match[] = {
 695         { .compatible = "panasonic,amg88xx", .data = &video_i2c_chip[AMG88XX] },
 696         {}
 697 };
 698 MODULE_DEVICE_TABLE(of, video_i2c_of_match);
 699
 700 static struct i2c_driver video_i2c_driver = {
 701         .driver = {
 702                 .name   = VIDEO_I2C_DRIVER,
 703                 .of_match_table = video_i2c_of_match,
 704         },
 705         .probe          = video_i2c_probe,
 706         .remove         = video_i2c_remove,
 707         .id_table       = video_i2c_id_table,
 708 };
 709
 710 module_i2c_driver(video_i2c_driver);
 711
 712 MODULE_AUTHOR("Matt Ranostay <matt.ranostay@konsulko.com>");
 713 MODULE_DESCRIPTION("I2C transport video support");
 714 MODULE_LICENSE("GPL v2");