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  * - Melexis MLX90640 Thermal Cameras
  10  */
  11
  12 #include <linux/delay.h>
  13 #include <linux/freezer.h>
  14 #include <linux/hwmon.h>
  15 #include <linux/kthread.h>
  16 #include <linux/i2c.h>
  17 #include <linux/list.h>
  18 #include <linux/module.h>
  19 #include <linux/mutex.h>
  20 #include <linux/of_device.h>
  21 #include <linux/pm_runtime.h>
  22 #include <linux/nvmem-provider.h>
  23 #include <linux/regmap.h>
  24 #include <linux/sched.h>
  25 #include <linux/slab.h>
  26 #include <linux/videodev2.h>
  27 #include <media/v4l2-common.h>
  28 #include <media/v4l2-device.h>
  29 #include <media/v4l2-event.h>
  30 #include <media/v4l2-fh.h>
  31 #include <media/v4l2-ioctl.h>
  32 #include <media/videobuf2-v4l2.h>
  33 #include <media/videobuf2-vmalloc.h>
  34
  35 #define VIDEO_I2C_DRIVER        "video-i2c"
  36
  37 struct video_i2c_chip;
  38
  39 struct video_i2c_buffer {
  40         struct vb2_v4l2_buffer vb;
  41         struct list_head list;
  42 };
  43
  44 struct video_i2c_data {
  45         struct regmap *regmap;
  46         const struct video_i2c_chip *chip;
  47         struct mutex lock;
  48         spinlock_t slock;
  49         unsigned int sequence;
  50         struct mutex queue_lock;
  51
  52         struct v4l2_device v4l2_dev;
  53         struct video_device vdev;
  54         struct vb2_queue vb_vidq;
  55
  56         struct task_struct *kthread_vid_cap;
  57         struct list_head vid_cap_active;
  58
  59         struct v4l2_fract frame_interval;
  60 };
  61
  62 static const struct v4l2_fmtdesc amg88xx_format = {
  63         .pixelformat = V4L2_PIX_FMT_Y12,
  64 };
  65
  66 static const struct v4l2_frmsize_discrete amg88xx_size = {
  67         .width = 8,
  68         .height = 8,
  69 };
  70
  71 static const struct v4l2_fmtdesc mlx90640_format = {
  72         .pixelformat = V4L2_PIX_FMT_Y16_BE,
  73 };
  74
  75 static const struct v4l2_frmsize_discrete mlx90640_size = {
  76         .width = 32,
  77         .height = 26, /* 24 lines of pixel data + 2 lines of processing data */
  78 };
  79
  80 static const struct regmap_config amg88xx_regmap_config = {
  81         .reg_bits = 8,
  82         .val_bits = 8,
  83         .max_register = 0xff
  84 };
  85
  86 static const struct regmap_config mlx90640_regmap_config = {
  87         .reg_bits = 16,
  88         .val_bits = 16,
  89 };
  90
  91 struct video_i2c_chip {
  92         /* video dimensions */
  93         const struct v4l2_fmtdesc *format;
  94         const struct v4l2_frmsize_discrete *size;
  95
  96         /* available frame intervals */
  97         const struct v4l2_fract *frame_intervals;
  98         unsigned int num_frame_intervals;
  99
 100         /* pixel buffer size */
 101         unsigned int buffer_size;
 102
 103         /* pixel size in bits */
 104         unsigned int bpp;
 105
 106         const struct regmap_config *regmap_config;
 107         struct nvmem_config *nvmem_config;
 108
 109         /* setup function */
 110         int (*setup)(struct video_i2c_data *data);
 111
 112         /* xfer function */
 113         int (*xfer)(struct video_i2c_data *data, char *buf);
 114
 115         /* power control function */
 116         int (*set_power)(struct video_i2c_data *data, bool on);
 117
 118         /* hwmon init function */
 119         int (*hwmon_init)(struct video_i2c_data *data);
 120 };
 121
 122 static int mlx90640_nvram_read(void *priv, unsigned int offset, void *val,
 123                              size_t bytes)
 124 {
 125         struct video_i2c_data *data = priv;
 126
 127         return regmap_bulk_read(data->regmap, 0x2400 + offset, val, bytes);
 128 }
 129
 130 static struct nvmem_config mlx90640_nvram_config = {
 131         .name = "mlx90640_nvram",
 132         .word_size = 2,
 133         .stride = 1,
 134         .size = 1664,
 135         .reg_read = mlx90640_nvram_read,
 136 };
 137
 138 /* Power control register */
 139 #define AMG88XX_REG_PCTL        0x00
 140 #define AMG88XX_PCTL_NORMAL             0x00
 141 #define AMG88XX_PCTL_SLEEP              0x10
 142
 143 /* Reset register */
 144 #define AMG88XX_REG_RST         0x01
 145 #define AMG88XX_RST_FLAG                0x30
 146 #define AMG88XX_RST_INIT                0x3f
 147
 148 /* Frame rate register */
 149 #define AMG88XX_REG_FPSC        0x02
 150 #define AMG88XX_FPSC_1FPS               BIT(0)
 151
 152 /* Thermistor register */
 153 #define AMG88XX_REG_TTHL        0x0e
 154
 155 /* Temperature register */
 156 #define AMG88XX_REG_T01L        0x80
 157
 158 /* Control register */
 159 #define MLX90640_REG_CTL1               0x800d
 160 #define MLX90640_REG_CTL1_MASK          0x0380
 161 #define MLX90640_REG_CTL1_MASK_SHIFT    7
 162
 163 static int amg88xx_xfer(struct video_i2c_data *data, char *buf)
 164 {
 165         return regmap_bulk_read(data->regmap, AMG88XX_REG_T01L, buf,
 166                                 data->chip->buffer_size);
 167 }
 168
 169 static int mlx90640_xfer(struct video_i2c_data *data, char *buf)
 170 {
 171         return regmap_bulk_read(data->regmap, 0x400, buf,
 172                                 data->chip->buffer_size);
 173 }
 174
 175 static int amg88xx_setup(struct video_i2c_data *data)
 176 {
 177         unsigned int mask = AMG88XX_FPSC_1FPS;
 178         unsigned int val;
 179
 180         if (data->frame_interval.numerator == data->frame_interval.denominator)
 181                 val = mask;
 182         else
 183                 val = 0;
 184
 185         return regmap_update_bits(data->regmap, AMG88XX_REG_FPSC, mask, val);
 186 }
 187
 188 static int mlx90640_setup(struct video_i2c_data *data)
 189 {
 190         unsigned int n, idx;
 191
 192         for (n = 0; n < data->chip->num_frame_intervals - 1; n++) {
 193                 if (V4L2_FRACT_COMPARE(data->frame_interval, ==,
 194                                        data->chip->frame_intervals[n]))
 195                         break;
 196         }
 197
 198         idx = data->chip->num_frame_intervals - n - 1;
 199
 200         return regmap_update_bits(data->regmap, MLX90640_REG_CTL1,
 201                                   MLX90640_REG_CTL1_MASK,
 202                                   idx << MLX90640_REG_CTL1_MASK_SHIFT);
 203 }
 204
 205 static int amg88xx_set_power_on(struct video_i2c_data *data)
 206 {
 207         int ret;
 208
 209         ret = regmap_write(data->regmap, AMG88XX_REG_PCTL, AMG88XX_PCTL_NORMAL);
 210         if (ret)
 211                 return ret;
 212
 213         msleep(50);
 214
 215         ret = regmap_write(data->regmap, AMG88XX_REG_RST, AMG88XX_RST_INIT);
 216         if (ret)
 217                 return ret;
 218
 219         usleep_range(2000, 3000);
 220
 221         ret = regmap_write(data->regmap, AMG88XX_REG_RST, AMG88XX_RST_FLAG);
 222         if (ret)
 223                 return ret;
 224
 225         /*
 226          * Wait two frames before reading thermistor and temperature registers
 227          */
 228         msleep(200);
 229
 230         return 0;
 231 }
 232
 233 static int amg88xx_set_power_off(struct video_i2c_data *data)
 234 {
 235         int ret;
 236
 237         ret = regmap_write(data->regmap, AMG88XX_REG_PCTL, AMG88XX_PCTL_SLEEP);
 238         if (ret)
 239                 return ret;
 240         /*
 241          * Wait for a while to avoid resuming normal mode immediately after
 242          * entering sleep mode, otherwise the device occasionally goes wrong
 243          * (thermistor and temperature registers are not updated at all)
 244          */
 245         msleep(100);
 246
 247         return 0;
 248 }
 249
 250 static int amg88xx_set_power(struct video_i2c_data *data, bool on)
 251 {
 252         if (on)
 253                 return amg88xx_set_power_on(data);
 254
 255         return amg88xx_set_power_off(data);
 256 }
 257
 258 #if IS_REACHABLE(CONFIG_HWMON)
 259
 260 static const u32 amg88xx_temp_config[] = {
 261         HWMON_T_INPUT,
 262         0
 263 };
 264
 265 static const struct hwmon_channel_info amg88xx_temp = {
 266         .type = hwmon_temp,
 267         .config = amg88xx_temp_config,
 268 };
 269
 270 static const struct hwmon_channel_info *amg88xx_info[] = {
 271         &amg88xx_temp,
 272         NULL
 273 };
 274
 275 static umode_t amg88xx_is_visible(const void *drvdata,
 276                                   enum hwmon_sensor_types type,
 277                                   u32 attr, int channel)
 278 {
 279         return 0444;
 280 }
 281
 282 static int amg88xx_read(struct device *dev, enum hwmon_sensor_types type,
 283                         u32 attr, int channel, long *val)
 284 {
 285         struct video_i2c_data *data = dev_get_drvdata(dev);
 286         __le16 buf;
 287         int tmp;
 288
 289         tmp = pm_runtime_resume_and_get(regmap_get_device(data->regmap));
 290         if (tmp < 0)
 291                 return tmp;
 292
 293         tmp = regmap_bulk_read(data->regmap, AMG88XX_REG_TTHL, &buf, 2);
 294         pm_runtime_mark_last_busy(regmap_get_device(data->regmap));
 295         pm_runtime_put_autosuspend(regmap_get_device(data->regmap));
 296         if (tmp)
 297                 return tmp;
 298
 299         tmp = le16_to_cpu(buf);
 300
 301         /*
 302          * Check for sign bit, this isn't a two's complement value but an
 303          * absolute temperature that needs to be inverted in the case of being
 304          * negative.
 305          */
 306         if (tmp & BIT(11))
 307                 tmp = -(tmp & 0x7ff);
 308
 309         *val = (tmp * 625) / 10;
 310
 311         return 0;
 312 }
 313
 314 static const struct hwmon_ops amg88xx_hwmon_ops = {
 315         .is_visible = amg88xx_is_visible,
 316         .read = amg88xx_read,
 317 };
 318
 319 static const struct hwmon_chip_info amg88xx_chip_info = {
 320         .ops = &amg88xx_hwmon_ops,
 321         .info = amg88xx_info,
 322 };
 323
 324 static int amg88xx_hwmon_init(struct video_i2c_data *data)
 325 {
 326         struct device *dev = regmap_get_device(data->regmap);
 327         void *hwmon = devm_hwmon_device_register_with_info(dev, "amg88xx", data,
 328                                                 &amg88xx_chip_info, NULL);
 329
 330         return PTR_ERR_OR_ZERO(hwmon);
 331 }
 332 #else
 333 #define amg88xx_hwmon_init      NULL
 334 #endif
 335
 336 enum {
 337         AMG88XX,
 338         MLX90640,
 339 };
 340
 341 static const struct v4l2_fract amg88xx_frame_intervals[] = {
 342         { 1, 10 },
 343         { 1, 1 },
 344 };
 345
 346 static const struct v4l2_fract mlx90640_frame_intervals[] = {
 347         { 1, 64 },
 348         { 1, 32 },
 349         { 1, 16 },
 350         { 1, 8 },
 351         { 1, 4 },
 352         { 1, 2 },
 353         { 1, 1 },
 354         { 2, 1 },
 355 };
 356
 357 static const struct video_i2c_chip video_i2c_chip[] = {
 358         [AMG88XX] = {
 359                 .size           = &amg88xx_size,
 360                 .format         = &amg88xx_format,
 361                 .frame_intervals        = amg88xx_frame_intervals,
 362                 .num_frame_intervals    = ARRAY_SIZE(amg88xx_frame_intervals),
 363                 .buffer_size    = 128,
 364                 .bpp            = 16,
 365                 .regmap_config  = &amg88xx_regmap_config,
 366                 .setup          = &amg88xx_setup,
 367                 .xfer           = &amg88xx_xfer,
 368                 .set_power      = amg88xx_set_power,
 369                 .hwmon_init     = amg88xx_hwmon_init,
 370         },
 371         [MLX90640] = {
 372                 .size           = &mlx90640_size,
 373                 .format         = &mlx90640_format,
 374                 .frame_intervals        = mlx90640_frame_intervals,
 375                 .num_frame_intervals    = ARRAY_SIZE(mlx90640_frame_intervals),
 376                 .buffer_size    = 1664,
 377                 .bpp            = 16,
 378                 .regmap_config  = &mlx90640_regmap_config,
 379                 .nvmem_config   = &mlx90640_nvram_config,
 380                 .setup          = mlx90640_setup,
 381                 .xfer           = mlx90640_xfer,
 382         },
 383 };
 384
 385 static const struct v4l2_file_operations video_i2c_fops = {
 386         .owner          = THIS_MODULE,
 387         .open           = v4l2_fh_open,
 388         .release        = vb2_fop_release,
 389         .poll           = vb2_fop_poll,
 390         .read           = vb2_fop_read,
 391         .mmap           = vb2_fop_mmap,
 392         .unlocked_ioctl = video_ioctl2,
 393 };
 394
 395 static int queue_setup(struct vb2_queue *vq,
 396                        unsigned int *nbuffers, unsigned int *nplanes,
 397                        unsigned int sizes[], struct device *alloc_devs[])
 398 {
 399         struct video_i2c_data *data = vb2_get_drv_priv(vq);
 400         unsigned int size = data->chip->buffer_size;
 401
 402         if (vq->num_buffers + *nbuffers < 2)
 403                 *nbuffers = 2;
 404
 405         if (*nplanes)
 406                 return sizes[0] < size ? -EINVAL : 0;
 407
 408         *nplanes = 1;
 409         sizes[0] = size;
 410
 411         return 0;
 412 }
 413
 414 static int buffer_prepare(struct vb2_buffer *vb)
 415 {
 416         struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
 417         struct video_i2c_data *data = vb2_get_drv_priv(vb->vb2_queue);
 418         unsigned int size = data->chip->buffer_size;
 419
 420         if (vb2_plane_size(vb, 0) < size)
 421                 return -EINVAL;
 422
 423         vbuf->field = V4L2_FIELD_NONE;
 424         vb2_set_plane_payload(vb, 0, size);
 425
 426         return 0;
 427 }
 428
 429 static void buffer_queue(struct vb2_buffer *vb)
 430 {
 431         struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
 432         struct video_i2c_data *data = vb2_get_drv_priv(vb->vb2_queue);
 433         struct video_i2c_buffer *buf =
 434                         container_of(vbuf, struct video_i2c_buffer, vb);
 435
 436         spin_lock(&data->slock);
 437         list_add_tail(&buf->list, &data->vid_cap_active);
 438         spin_unlock(&data->slock);
 439 }
 440
 441 static int video_i2c_thread_vid_cap(void *priv)
 442 {
 443         struct video_i2c_data *data = priv;
 444         unsigned int delay = mult_frac(HZ, data->frame_interval.numerator,
 445                                        data->frame_interval.denominator);
 446
 447         set_freezable();
 448
 449         do {
 450                 unsigned long start_jiffies = jiffies;
 451                 struct video_i2c_buffer *vid_cap_buf = NULL;
 452                 int schedule_delay;
 453
 454                 try_to_freeze();
 455
 456                 spin_lock(&data->slock);
 457
 458                 if (!list_empty(&data->vid_cap_active)) {
 459                         vid_cap_buf = list_last_entry(&data->vid_cap_active,
 460                                                  struct video_i2c_buffer, list);
 461                         list_del(&vid_cap_buf->list);
 462                 }
 463
 464                 spin_unlock(&data->slock);
 465
 466                 if (vid_cap_buf) {
 467                         struct vb2_buffer *vb2_buf = &vid_cap_buf->vb.vb2_buf;
 468                         void *vbuf = vb2_plane_vaddr(vb2_buf, 0);
 469                         int ret;
 470
 471                         ret = data->chip->xfer(data, vbuf);
 472                         vb2_buf->timestamp = ktime_get_ns();
 473                         vid_cap_buf->vb.sequence = data->sequence++;
 474                         vb2_buffer_done(vb2_buf, ret ?
 475                                 VB2_BUF_STATE_ERROR : VB2_BUF_STATE_DONE);
 476                 }
 477
 478                 schedule_delay = delay - (jiffies - start_jiffies);
 479
 480                 if (time_after(jiffies, start_jiffies + delay))
 481                         schedule_delay = delay;
 482
 483                 schedule_timeout_interruptible(schedule_delay);
 484         } while (!kthread_should_stop());
 485
 486         return 0;
 487 }
 488
 489 static void video_i2c_del_list(struct vb2_queue *vq, enum vb2_buffer_state state)
 490 {
 491         struct video_i2c_data *data = vb2_get_drv_priv(vq);
 492         struct video_i2c_buffer *buf, *tmp;
 493
 494         spin_lock(&data->slock);
 495
 496         list_for_each_entry_safe(buf, tmp, &data->vid_cap_active, list) {
 497                 list_del(&buf->list);
 498                 vb2_buffer_done(&buf->vb.vb2_buf, state);
 499         }
 500
 501         spin_unlock(&data->slock);
 502 }
 503
 504 static int start_streaming(struct vb2_queue *vq, unsigned int count)
 505 {
 506         struct video_i2c_data *data = vb2_get_drv_priv(vq);
 507         struct device *dev = regmap_get_device(data->regmap);
 508         int ret;
 509
 510         if (data->kthread_vid_cap)
 511                 return 0;
 512
 513         ret = pm_runtime_resume_and_get(dev);
 514         if (ret < 0)
 515                 goto error_del_list;
 516
 517         ret = data->chip->setup(data);
 518         if (ret)
 519                 goto error_rpm_put;
 520
 521         data->sequence = 0;
 522         data->kthread_vid_cap = kthread_run(video_i2c_thread_vid_cap, data,
 523                                             "%s-vid-cap", data->v4l2_dev.name);
 524         ret = PTR_ERR_OR_ZERO(data->kthread_vid_cap);
 525         if (!ret)
 526                 return 0;
 527
 528 error_rpm_put:
 529         pm_runtime_mark_last_busy(dev);
 530         pm_runtime_put_autosuspend(dev);
 531 error_del_list:
 532         video_i2c_del_list(vq, VB2_BUF_STATE_QUEUED);
 533
 534         return ret;
 535 }
 536
 537 static void stop_streaming(struct vb2_queue *vq)
 538 {
 539         struct video_i2c_data *data = vb2_get_drv_priv(vq);
 540
 541         if (data->kthread_vid_cap == NULL)
 542                 return;
 543
 544         kthread_stop(data->kthread_vid_cap);
 545         data->kthread_vid_cap = NULL;
 546         pm_runtime_mark_last_busy(regmap_get_device(data->regmap));
 547         pm_runtime_put_autosuspend(regmap_get_device(data->regmap));
 548
 549         video_i2c_del_list(vq, VB2_BUF_STATE_ERROR);
 550 }
 551
 552 static const struct vb2_ops video_i2c_video_qops = {
 553         .queue_setup            = queue_setup,
 554         .buf_prepare            = buffer_prepare,
 555         .buf_queue              = buffer_queue,
 556         .start_streaming        = start_streaming,
 557         .stop_streaming         = stop_streaming,
 558         .wait_prepare           = vb2_ops_wait_prepare,
 559         .wait_finish            = vb2_ops_wait_finish,
 560 };
 561
 562 static int video_i2c_querycap(struct file *file, void  *priv,
 563                                 struct v4l2_capability *vcap)
 564 {
 565         struct video_i2c_data *data = video_drvdata(file);
 566         struct device *dev = regmap_get_device(data->regmap);
 567         struct i2c_client *client = to_i2c_client(dev);
 568
 569         strscpy(vcap->driver, data->v4l2_dev.name, sizeof(vcap->driver));
 570         strscpy(vcap->card, data->vdev.name, sizeof(vcap->card));
 571
 572         sprintf(vcap->bus_info, "I2C:%d-%d", client->adapter->nr, client->addr);
 573
 574         return 0;
 575 }
 576
 577 static int video_i2c_g_input(struct file *file, void *fh, unsigned int *inp)
 578 {
 579         *inp = 0;
 580
 581         return 0;
 582 }
 583
 584 static int video_i2c_s_input(struct file *file, void *fh, unsigned int inp)
 585 {
 586         return (inp > 0) ? -EINVAL : 0;
 587 }
 588
 589 static int video_i2c_enum_input(struct file *file, void *fh,
 590                                   struct v4l2_input *vin)
 591 {
 592         if (vin->index > 0)
 593                 return -EINVAL;
 594
 595         strscpy(vin->name, "Camera", sizeof(vin->name));
 596
 597         vin->type = V4L2_INPUT_TYPE_CAMERA;
 598
 599         return 0;
 600 }
 601
 602 static int video_i2c_enum_fmt_vid_cap(struct file *file, void *fh,
 603                                         struct v4l2_fmtdesc *fmt)
 604 {
 605         struct video_i2c_data *data = video_drvdata(file);
 606         enum v4l2_buf_type type = fmt->type;
 607
 608         if (fmt->index > 0)
 609                 return -EINVAL;
 610
 611         *fmt = *data->chip->format;
 612         fmt->type = type;
 613
 614         return 0;
 615 }
 616
 617 static int video_i2c_enum_framesizes(struct file *file, void *fh,
 618                                        struct v4l2_frmsizeenum *fsize)
 619 {
 620         const struct video_i2c_data *data = video_drvdata(file);
 621         const struct v4l2_frmsize_discrete *size = data->chip->size;
 622
 623         /* currently only one frame size is allowed */
 624         if (fsize->index > 0)
 625                 return -EINVAL;
 626
 627         if (fsize->pixel_format != data->chip->format->pixelformat)
 628                 return -EINVAL;
 629
 630         fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
 631         fsize->discrete.width = size->width;
 632         fsize->discrete.height = size->height;
 633
 634         return 0;
 635 }
 636
 637 static int video_i2c_enum_frameintervals(struct file *file, void *priv,
 638                                            struct v4l2_frmivalenum *fe)
 639 {
 640         const struct video_i2c_data *data = video_drvdata(file);
 641         const struct v4l2_frmsize_discrete *size = data->chip->size;
 642
 643         if (fe->index >= data->chip->num_frame_intervals)
 644                 return -EINVAL;
 645
 646         if (fe->width != size->width || fe->height != size->height)
 647                 return -EINVAL;
 648
 649         fe->type = V4L2_FRMIVAL_TYPE_DISCRETE;
 650         fe->discrete = data->chip->frame_intervals[fe->index];
 651
 652         return 0;
 653 }
 654
 655 static int video_i2c_try_fmt_vid_cap(struct file *file, void *fh,
 656                                        struct v4l2_format *fmt)
 657 {
 658         const struct video_i2c_data *data = video_drvdata(file);
 659         const struct v4l2_frmsize_discrete *size = data->chip->size;
 660         struct v4l2_pix_format *pix = &fmt->fmt.pix;
 661         unsigned int bpp = data->chip->bpp / 8;
 662
 663         pix->width = size->width;
 664         pix->height = size->height;
 665         pix->pixelformat = data->chip->format->pixelformat;
 666         pix->field = V4L2_FIELD_NONE;
 667         pix->bytesperline = pix->width * bpp;
 668         pix->sizeimage = pix->bytesperline * pix->height;
 669         pix->colorspace = V4L2_COLORSPACE_RAW;
 670
 671         return 0;
 672 }
 673
 674 static int video_i2c_s_fmt_vid_cap(struct file *file, void *fh,
 675                                      struct v4l2_format *fmt)
 676 {
 677         struct video_i2c_data *data = video_drvdata(file);
 678
 679         if (vb2_is_busy(&data->vb_vidq))
 680                 return -EBUSY;
 681
 682         return video_i2c_try_fmt_vid_cap(file, fh, fmt);
 683 }
 684
 685 static int video_i2c_g_parm(struct file *filp, void *priv,
 686                               struct v4l2_streamparm *parm)
 687 {
 688         struct video_i2c_data *data = video_drvdata(filp);
 689
 690         if (parm->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
 691                 return -EINVAL;
 692
 693         parm->parm.capture.readbuffers = 1;
 694         parm->parm.capture.capability = V4L2_CAP_TIMEPERFRAME;
 695         parm->parm.capture.timeperframe = data->frame_interval;
 696
 697         return 0;
 698 }
 699
 700 static int video_i2c_s_parm(struct file *filp, void *priv,
 701                               struct v4l2_streamparm *parm)
 702 {
 703         struct video_i2c_data *data = video_drvdata(filp);
 704         int i;
 705
 706         for (i = 0; i < data->chip->num_frame_intervals - 1; i++) {
 707                 if (V4L2_FRACT_COMPARE(parm->parm.capture.timeperframe, <=,
 708                                        data->chip->frame_intervals[i]))
 709                         break;
 710         }
 711         data->frame_interval = data->chip->frame_intervals[i];
 712
 713         return video_i2c_g_parm(filp, priv, parm);
 714 }
 715
 716 static const struct v4l2_ioctl_ops video_i2c_ioctl_ops = {
 717         .vidioc_querycap                = video_i2c_querycap,
 718         .vidioc_g_input                 = video_i2c_g_input,
 719         .vidioc_s_input                 = video_i2c_s_input,
 720         .vidioc_enum_input              = video_i2c_enum_input,
 721         .vidioc_enum_fmt_vid_cap        = video_i2c_enum_fmt_vid_cap,
 722         .vidioc_enum_framesizes         = video_i2c_enum_framesizes,
 723         .vidioc_enum_frameintervals     = video_i2c_enum_frameintervals,
 724         .vidioc_g_fmt_vid_cap           = video_i2c_try_fmt_vid_cap,
 725         .vidioc_s_fmt_vid_cap           = video_i2c_s_fmt_vid_cap,
 726         .vidioc_g_parm                  = video_i2c_g_parm,
 727         .vidioc_s_parm                  = video_i2c_s_parm,
 728         .vidioc_try_fmt_vid_cap         = video_i2c_try_fmt_vid_cap,
 729         .vidioc_reqbufs                 = vb2_ioctl_reqbufs,
 730         .vidioc_create_bufs             = vb2_ioctl_create_bufs,
 731         .vidioc_prepare_buf             = vb2_ioctl_prepare_buf,
 732         .vidioc_querybuf                = vb2_ioctl_querybuf,
 733         .vidioc_qbuf                    = vb2_ioctl_qbuf,
 734         .vidioc_dqbuf                   = vb2_ioctl_dqbuf,
 735         .vidioc_streamon                = vb2_ioctl_streamon,
 736         .vidioc_streamoff               = vb2_ioctl_streamoff,
 737 };
 738
 739 static void video_i2c_release(struct video_device *vdev)
 740 {
 741         struct video_i2c_data *data = video_get_drvdata(vdev);
 742
 743         v4l2_device_unregister(&data->v4l2_dev);
 744         mutex_destroy(&data->lock);
 745         mutex_destroy(&data->queue_lock);
 746         regmap_exit(data->regmap);
 747         kfree(data);
 748 }
 749
 750 static int video_i2c_probe(struct i2c_client *client,
 751                              const struct i2c_device_id *id)
 752 {
 753         struct video_i2c_data *data;
 754         struct v4l2_device *v4l2_dev;
 755         struct vb2_queue *queue;
 756         int ret = -ENODEV;
 757
 758         data = kzalloc(sizeof(*data), GFP_KERNEL);
 759         if (!data)
 760                 return -ENOMEM;
 761
 762         if (dev_fwnode(&client->dev))
 763                 data->chip = device_get_match_data(&client->dev);
 764         else if (id)
 765                 data->chip = &video_i2c_chip[id->driver_data];
 766         else
 767                 goto error_free_device;
 768
 769         data->regmap = regmap_init_i2c(client, data->chip->regmap_config);
 770         if (IS_ERR(data->regmap)) {
 771                 ret = PTR_ERR(data->regmap);
 772                 goto error_free_device;
 773         }
 774
 775         v4l2_dev = &data->v4l2_dev;
 776         strscpy(v4l2_dev->name, VIDEO_I2C_DRIVER, sizeof(v4l2_dev->name));
 777
 778         ret = v4l2_device_register(&client->dev, v4l2_dev);
 779         if (ret < 0)
 780                 goto error_regmap_exit;
 781
 782         mutex_init(&data->lock);
 783         mutex_init(&data->queue_lock);
 784
 785         queue = &data->vb_vidq;
 786         queue->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 787         queue->io_modes = VB2_DMABUF | VB2_MMAP | VB2_USERPTR | VB2_READ;
 788         queue->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
 789         queue->drv_priv = data;
 790         queue->buf_struct_size = sizeof(struct video_i2c_buffer);
 791         queue->min_buffers_needed = 1;
 792         queue->ops = &video_i2c_video_qops;
 793         queue->mem_ops = &vb2_vmalloc_memops;
 794
 795         ret = vb2_queue_init(queue);
 796         if (ret < 0)
 797                 goto error_unregister_device;
 798
 799         data->vdev.queue = queue;
 800         data->vdev.queue->lock = &data->queue_lock;
 801
 802         snprintf(data->vdev.name, sizeof(data->vdev.name),
 803                                  "I2C %d-%d Transport Video",
 804                                  client->adapter->nr, client->addr);
 805
 806         data->vdev.v4l2_dev = v4l2_dev;
 807         data->vdev.fops = &video_i2c_fops;
 808         data->vdev.lock = &data->lock;
 809         data->vdev.ioctl_ops = &video_i2c_ioctl_ops;
 810         data->vdev.release = video_i2c_release;
 811         data->vdev.device_caps = V4L2_CAP_VIDEO_CAPTURE |
 812                                  V4L2_CAP_READWRITE | V4L2_CAP_STREAMING;
 813
 814         spin_lock_init(&data->slock);
 815         INIT_LIST_HEAD(&data->vid_cap_active);
 816
 817         data->frame_interval = data->chip->frame_intervals[0];
 818
 819         video_set_drvdata(&data->vdev, data);
 820         i2c_set_clientdata(client, data);
 821
 822         if (data->chip->set_power) {
 823                 ret = data->chip->set_power(data, true);
 824                 if (ret)
 825                         goto error_unregister_device;
 826         }
 827
 828         pm_runtime_get_noresume(&client->dev);
 829         pm_runtime_set_active(&client->dev);
 830         pm_runtime_enable(&client->dev);
 831         pm_runtime_set_autosuspend_delay(&client->dev, 2000);
 832         pm_runtime_use_autosuspend(&client->dev);
 833
 834         if (data->chip->hwmon_init) {
 835                 ret = data->chip->hwmon_init(data);
 836                 if (ret < 0) {
 837                         dev_warn(&client->dev,
 838                                  "failed to register hwmon device\n");
 839                 }
 840         }
 841
 842         if (data->chip->nvmem_config) {
 843                 struct nvmem_config *config = data->chip->nvmem_config;
 844                 struct nvmem_device *device;
 845
 846                 config->priv = data;
 847                 config->dev = &client->dev;
 848
 849                 device = devm_nvmem_register(&client->dev, config);
 850
 851                 if (IS_ERR(device)) {
 852                         dev_warn(&client->dev,
 853                                  "failed to register nvmem device\n");
 854                 }
 855         }
 856
 857         ret = video_register_device(&data->vdev, VFL_TYPE_VIDEO, -1);
 858         if (ret < 0)
 859                 goto error_pm_disable;
 860
 861         pm_runtime_mark_last_busy(&client->dev);
 862         pm_runtime_put_autosuspend(&client->dev);
 863
 864         return 0;
 865
 866 error_pm_disable:
 867         pm_runtime_disable(&client->dev);
 868         pm_runtime_set_suspended(&client->dev);
 869         pm_runtime_put_noidle(&client->dev);
 870
 871         if (data->chip->set_power)
 872                 data->chip->set_power(data, false);
 873
 874 error_unregister_device:
 875         v4l2_device_unregister(v4l2_dev);
 876         mutex_destroy(&data->lock);
 877         mutex_destroy(&data->queue_lock);
 878
 879 error_regmap_exit:
 880         regmap_exit(data->regmap);
 881
 882 error_free_device:
 883         kfree(data);
 884
 885         return ret;
 886 }
 887
 888 static int video_i2c_remove(struct i2c_client *client)
 889 {
 890         struct video_i2c_data *data = i2c_get_clientdata(client);
 891
 892         pm_runtime_get_sync(&client->dev);
 893         pm_runtime_disable(&client->dev);
 894         pm_runtime_set_suspended(&client->dev);
 895         pm_runtime_put_noidle(&client->dev);
 896
 897         if (data->chip->set_power)
 898                 data->chip->set_power(data, false);
 899
 900         video_unregister_device(&data->vdev);
 901
 902         return 0;
 903 }
 904
 905 #ifdef CONFIG_PM
 906
 907 static int video_i2c_pm_runtime_suspend(struct device *dev)
 908 {
 909         struct video_i2c_data *data = i2c_get_clientdata(to_i2c_client(dev));
 910
 911         if (!data->chip->set_power)
 912                 return 0;
 913
 914         return data->chip->set_power(data, false);
 915 }
 916
 917 static int video_i2c_pm_runtime_resume(struct device *dev)
 918 {
 919         struct video_i2c_data *data = i2c_get_clientdata(to_i2c_client(dev));
 920
 921         if (!data->chip->set_power)
 922                 return 0;
 923
 924         return data->chip->set_power(data, true);
 925 }
 926
 927 #endif
 928
 929 static const struct dev_pm_ops video_i2c_pm_ops = {
 930         SET_RUNTIME_PM_OPS(video_i2c_pm_runtime_suspend,
 931                            video_i2c_pm_runtime_resume, NULL)
 932 };
 933
 934 static const struct i2c_device_id video_i2c_id_table[] = {
 935         { "amg88xx", AMG88XX },
 936         { "mlx90640", MLX90640 },
 937         {}
 938 };
 939 MODULE_DEVICE_TABLE(i2c, video_i2c_id_table);
 940
 941 static const struct of_device_id video_i2c_of_match[] = {
 942         { .compatible = "panasonic,amg88xx", .data = &video_i2c_chip[AMG88XX] },
 943         { .compatible = "melexis,mlx90640", .data = &video_i2c_chip[MLX90640] },
 944         {}
 945 };
 946 MODULE_DEVICE_TABLE(of, video_i2c_of_match);
 947
 948 static struct i2c_driver video_i2c_driver = {
 949         .driver = {
 950                 .name   = VIDEO_I2C_DRIVER,
 951                 .of_match_table = video_i2c_of_match,
 952                 .pm     = &video_i2c_pm_ops,
 953         },
 954         .probe          = video_i2c_probe,
 955         .remove         = video_i2c_remove,
 956         .id_table       = video_i2c_id_table,
 957 };
 958
 959 module_i2c_driver(video_i2c_driver);
 960
 961 MODULE_AUTHOR("Matt Ranostay <matt.ranostay@konsulko.com>");
 962 MODULE_DESCRIPTION("I2C transport video support");
 963 MODULE_LICENSE("GPL v2");