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/bits.h> 13 #include <linux/delay.h> 14 #include <linux/freezer.h> 15 #include <linux/hwmon.h> 16 #include <linux/kthread.h> 17 #include <linux/i2c.h> 18 #include <linux/list.h> 19 #include <linux/mod_devicetable.h> 20 #include <linux/module.h> 21 #include <linux/mutex.h> 22 #include <linux/pm_runtime.h> 23 #include <linux/nvmem-provider.h> 24 #include <linux/regmap.h> 25 #include <linux/sched.h> 26 #include <linux/slab.h> 27 #include <linux/videodev2.h> 28 #include <media/v4l2-common.h> 29 #include <media/v4l2-device.h> 30 #include <media/v4l2-event.h> 31 #include <media/v4l2-fh.h> 32 #include <media/v4l2-ioctl.h> 33 #include <media/videobuf2-v4l2.h> 34 #include <media/videobuf2-vmalloc.h> 35 36 #define VIDEO_I2C_DRIVER "video-i2c" 37 38 /* Power control register */ 39 #define AMG88XX_REG_PCTL 0x00 40 #define AMG88XX_PCTL_NORMAL 0x00 41 #define AMG88XX_PCTL_SLEEP 0x10 42 43 /* Reset register */ 44 #define AMG88XX_REG_RST 0x01 45 #define AMG88XX_RST_FLAG 0x30 46 #define AMG88XX_RST_INIT 0x3f 47 48 /* Frame rate register */ 49 #define AMG88XX_REG_FPSC 0x02 50 #define AMG88XX_FPSC_1FPS BIT(0) 51 52 /* Thermistor register */ 53 #define AMG88XX_REG_TTHL 0x0e 54 55 /* Temperature register */ 56 #define AMG88XX_REG_T01L 0x80 57 58 /* RAM */ 59 #define MLX90640_RAM_START_ADDR 0x0400 60 61 /* EEPROM */ 62 #define MLX90640_EEPROM_START_ADDR 0x2400 63 64 /* Control register */ 65 #define MLX90640_REG_CTL1 0x800d 66 #define MLX90640_REG_CTL1_MASK GENMASK(9, 7) 67 #define MLX90640_REG_CTL1_MASK_SHIFT 7 68 69 struct video_i2c_chip; 70 71 struct video_i2c_buffer { 72 struct vb2_v4l2_buffer vb; 73 struct list_head list; 74 }; 75 76 struct video_i2c_data { 77 struct regmap *regmap; 78 const struct video_i2c_chip *chip; 79 struct mutex lock; 80 spinlock_t slock; 81 unsigned int sequence; 82 struct mutex queue_lock; 83 84 struct v4l2_device v4l2_dev; 85 struct video_device vdev; 86 struct vb2_queue vb_vidq; 87 88 struct task_struct *kthread_vid_cap; 89 struct list_head vid_cap_active; 90 91 struct v4l2_fract frame_interval; 92 }; 93 94 static const struct v4l2_fmtdesc amg88xx_format = { 95 .pixelformat = V4L2_PIX_FMT_Y12, 96 }; 97 98 static const struct v4l2_frmsize_discrete amg88xx_size = { 99 .width = 8, 100 .height = 8, 101 }; 102 103 static const struct v4l2_fmtdesc mlx90640_format = { 104 .pixelformat = V4L2_PIX_FMT_Y16_BE, 105 }; 106 107 static const struct v4l2_frmsize_discrete mlx90640_size = { 108 .width = 32, 109 .height = 26, /* 24 lines of pixel data + 2 lines of processing data */ 110 }; 111 112 static const struct regmap_config amg88xx_regmap_config = { 113 .reg_bits = 8, 114 .val_bits = 8, 115 .max_register = 0xff 116 }; 117 118 static const struct regmap_config mlx90640_regmap_config = { 119 .reg_bits = 16, 120 .val_bits = 16, 121 }; 122 123 struct video_i2c_chip { 124 /* video dimensions */ 125 const struct v4l2_fmtdesc *format; 126 const struct v4l2_frmsize_discrete *size; 127 128 /* available frame intervals */ 129 const struct v4l2_fract *frame_intervals; 130 unsigned int num_frame_intervals; 131 132 /* pixel buffer size */ 133 unsigned int buffer_size; 134 135 /* pixel size in bits */ 136 unsigned int bpp; 137 138 const struct regmap_config *regmap_config; 139 struct nvmem_config *nvmem_config; 140 141 /* setup function */ 142 int (*setup)(struct video_i2c_data *data); 143 144 /* xfer function */ 145 int (*xfer)(struct video_i2c_data *data, char *buf); 146 147 /* power control function */ 148 int (*set_power)(struct video_i2c_data *data, bool on); 149 150 /* hwmon init function */ 151 int (*hwmon_init)(struct video_i2c_data *data); 152 }; 153 154 static int mlx90640_nvram_read(void *priv, unsigned int offset, void *val, 155 size_t bytes) 156 { 157 struct video_i2c_data *data = priv; 158 159 return regmap_bulk_read(data->regmap, MLX90640_EEPROM_START_ADDR + offset, val, bytes); 160 } 161 162 static struct nvmem_config mlx90640_nvram_config = { 163 .name = "mlx90640_nvram", 164 .word_size = 2, 165 .stride = 1, 166 .size = 1664, 167 .reg_read = mlx90640_nvram_read, 168 }; 169 170 static int amg88xx_xfer(struct video_i2c_data *data, char *buf) 171 { 172 return regmap_bulk_read(data->regmap, AMG88XX_REG_T01L, buf, 173 data->chip->buffer_size); 174 } 175 176 static int mlx90640_xfer(struct video_i2c_data *data, char *buf) 177 { 178 return regmap_bulk_read(data->regmap, MLX90640_RAM_START_ADDR, buf, 179 data->chip->buffer_size); 180 } 181 182 static int amg88xx_setup(struct video_i2c_data *data) 183 { 184 unsigned int mask = AMG88XX_FPSC_1FPS; 185 unsigned int val; 186 187 if (data->frame_interval.numerator == data->frame_interval.denominator) 188 val = mask; 189 else 190 val = 0; 191 192 return regmap_update_bits(data->regmap, AMG88XX_REG_FPSC, mask, val); 193 } 194 195 static int mlx90640_setup(struct video_i2c_data *data) 196 { 197 unsigned int n, idx; 198 199 for (n = 0; n < data->chip->num_frame_intervals - 1; n++) { 200 if (V4L2_FRACT_COMPARE(data->frame_interval, ==, 201 data->chip->frame_intervals[n])) 202 break; 203 } 204 205 idx = data->chip->num_frame_intervals - n - 1; 206 207 return regmap_update_bits(data->regmap, MLX90640_REG_CTL1, 208 MLX90640_REG_CTL1_MASK, 209 idx << MLX90640_REG_CTL1_MASK_SHIFT); 210 } 211 212 static int amg88xx_set_power_on(struct video_i2c_data *data) 213 { 214 int ret; 215 216 ret = regmap_write(data->regmap, AMG88XX_REG_PCTL, AMG88XX_PCTL_NORMAL); 217 if (ret) 218 return ret; 219 220 msleep(50); 221 222 ret = regmap_write(data->regmap, AMG88XX_REG_RST, AMG88XX_RST_INIT); 223 if (ret) 224 return ret; 225 226 usleep_range(2000, 3000); 227 228 ret = regmap_write(data->regmap, AMG88XX_REG_RST, AMG88XX_RST_FLAG); 229 if (ret) 230 return ret; 231 232 /* 233 * Wait two frames before reading thermistor and temperature registers 234 */ 235 msleep(200); 236 237 return 0; 238 } 239 240 static int amg88xx_set_power_off(struct video_i2c_data *data) 241 { 242 int ret; 243 244 ret = regmap_write(data->regmap, AMG88XX_REG_PCTL, AMG88XX_PCTL_SLEEP); 245 if (ret) 246 return ret; 247 /* 248 * Wait for a while to avoid resuming normal mode immediately after 249 * entering sleep mode, otherwise the device occasionally goes wrong 250 * (thermistor and temperature registers are not updated at all) 251 */ 252 msleep(100); 253 254 return 0; 255 } 256 257 static int amg88xx_set_power(struct video_i2c_data *data, bool on) 258 { 259 if (on) 260 return amg88xx_set_power_on(data); 261 262 return amg88xx_set_power_off(data); 263 } 264 265 #if IS_REACHABLE(CONFIG_HWMON) 266 267 static const u32 amg88xx_temp_config[] = { 268 HWMON_T_INPUT, 269 0 270 }; 271 272 static const struct hwmon_channel_info amg88xx_temp = { 273 .type = hwmon_temp, 274 .config = amg88xx_temp_config, 275 }; 276 277 static const struct hwmon_channel_info * const amg88xx_info[] = { 278 &amg88xx_temp, 279 NULL 280 }; 281 282 static umode_t amg88xx_is_visible(const void *drvdata, 283 enum hwmon_sensor_types type, 284 u32 attr, int channel) 285 { 286 return 0444; 287 } 288 289 static int amg88xx_read(struct device *dev, enum hwmon_sensor_types type, 290 u32 attr, int channel, long *val) 291 { 292 struct video_i2c_data *data = dev_get_drvdata(dev); 293 __le16 buf; 294 int tmp; 295 296 tmp = pm_runtime_resume_and_get(regmap_get_device(data->regmap)); 297 if (tmp < 0) 298 return tmp; 299 300 tmp = regmap_bulk_read(data->regmap, AMG88XX_REG_TTHL, &buf, 2); 301 pm_runtime_mark_last_busy(regmap_get_device(data->regmap)); 302 pm_runtime_put_autosuspend(regmap_get_device(data->regmap)); 303 if (tmp) 304 return tmp; 305 306 tmp = le16_to_cpu(buf); 307 308 /* 309 * Check for sign bit, this isn't a two's complement value but an 310 * absolute temperature that needs to be inverted in the case of being 311 * negative. 312 */ 313 if (tmp & BIT(11)) 314 tmp = -(tmp & 0x7ff); 315 316 *val = (tmp * 625) / 10; 317 318 return 0; 319 } 320 321 static const struct hwmon_ops amg88xx_hwmon_ops = { 322 .is_visible = amg88xx_is_visible, 323 .read = amg88xx_read, 324 }; 325 326 static const struct hwmon_chip_info amg88xx_chip_info = { 327 .ops = &amg88xx_hwmon_ops, 328 .info = amg88xx_info, 329 }; 330 331 static int amg88xx_hwmon_init(struct video_i2c_data *data) 332 { 333 struct device *dev = regmap_get_device(data->regmap); 334 void *hwmon = devm_hwmon_device_register_with_info(dev, "amg88xx", data, 335 &amg88xx_chip_info, NULL); 336 337 return PTR_ERR_OR_ZERO(hwmon); 338 } 339 #else 340 #define amg88xx_hwmon_init NULL 341 #endif 342 343 enum { 344 AMG88XX, 345 MLX90640, 346 }; 347 348 static const struct v4l2_fract amg88xx_frame_intervals[] = { 349 { 1, 10 }, 350 { 1, 1 }, 351 }; 352 353 static const struct v4l2_fract mlx90640_frame_intervals[] = { 354 { 1, 64 }, 355 { 1, 32 }, 356 { 1, 16 }, 357 { 1, 8 }, 358 { 1, 4 }, 359 { 1, 2 }, 360 { 1, 1 }, 361 { 2, 1 }, 362 }; 363 364 static const struct video_i2c_chip video_i2c_chip[] = { 365 [AMG88XX] = { 366 .size = &amg88xx_size, 367 .format = &amg88xx_format, 368 .frame_intervals = amg88xx_frame_intervals, 369 .num_frame_intervals = ARRAY_SIZE(amg88xx_frame_intervals), 370 .buffer_size = 128, 371 .bpp = 16, 372 .regmap_config = &amg88xx_regmap_config, 373 .setup = &amg88xx_setup, 374 .xfer = &amg88xx_xfer, 375 .set_power = amg88xx_set_power, 376 .hwmon_init = amg88xx_hwmon_init, 377 }, 378 [MLX90640] = { 379 .size = &mlx90640_size, 380 .format = &mlx90640_format, 381 .frame_intervals = mlx90640_frame_intervals, 382 .num_frame_intervals = ARRAY_SIZE(mlx90640_frame_intervals), 383 .buffer_size = 1664, 384 .bpp = 16, 385 .regmap_config = &mlx90640_regmap_config, 386 .nvmem_config = &mlx90640_nvram_config, 387 .setup = mlx90640_setup, 388 .xfer = mlx90640_xfer, 389 }, 390 }; 391 392 static const struct v4l2_file_operations video_i2c_fops = { 393 .owner = THIS_MODULE, 394 .open = v4l2_fh_open, 395 .release = vb2_fop_release, 396 .poll = vb2_fop_poll, 397 .read = vb2_fop_read, 398 .mmap = vb2_fop_mmap, 399 .unlocked_ioctl = video_ioctl2, 400 }; 401 402 static int queue_setup(struct vb2_queue *vq, 403 unsigned int *nbuffers, unsigned int *nplanes, 404 unsigned int sizes[], struct device *alloc_devs[]) 405 { 406 struct video_i2c_data *data = vb2_get_drv_priv(vq); 407 unsigned int size = data->chip->buffer_size; 408 unsigned int q_num_bufs = vb2_get_num_buffers(vq); 409 410 if (q_num_bufs + *nbuffers < 2) 411 *nbuffers = 2 - q_num_bufs; 412 413 if (*nplanes) 414 return sizes[0] < size ? -EINVAL : 0; 415 416 *nplanes = 1; 417 sizes[0] = size; 418 419 return 0; 420 } 421 422 static int buffer_prepare(struct vb2_buffer *vb) 423 { 424 struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb); 425 struct video_i2c_data *data = vb2_get_drv_priv(vb->vb2_queue); 426 unsigned int size = data->chip->buffer_size; 427 428 if (vb2_plane_size(vb, 0) < size) 429 return -EINVAL; 430 431 vbuf->field = V4L2_FIELD_NONE; 432 vb2_set_plane_payload(vb, 0, size); 433 434 return 0; 435 } 436 437 static void buffer_queue(struct vb2_buffer *vb) 438 { 439 struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb); 440 struct video_i2c_data *data = vb2_get_drv_priv(vb->vb2_queue); 441 struct video_i2c_buffer *buf = 442 container_of(vbuf, struct video_i2c_buffer, vb); 443 444 spin_lock(&data->slock); 445 list_add_tail(&buf->list, &data->vid_cap_active); 446 spin_unlock(&data->slock); 447 } 448 449 static int video_i2c_thread_vid_cap(void *priv) 450 { 451 struct video_i2c_data *data = priv; 452 u32 delay = mult_frac(1000000UL, data->frame_interval.numerator, 453 data->frame_interval.denominator); 454 s64 end_us = ktime_to_us(ktime_get()); 455 456 set_freezable(); 457 458 do { 459 struct video_i2c_buffer *vid_cap_buf = NULL; 460 s64 current_us; 461 int schedule_delay; 462 463 try_to_freeze(); 464 465 spin_lock(&data->slock); 466 467 if (!list_empty(&data->vid_cap_active)) { 468 vid_cap_buf = list_last_entry(&data->vid_cap_active, 469 struct video_i2c_buffer, list); 470 list_del(&vid_cap_buf->list); 471 } 472 473 spin_unlock(&data->slock); 474 475 if (vid_cap_buf) { 476 struct vb2_buffer *vb2_buf = &vid_cap_buf->vb.vb2_buf; 477 void *vbuf = vb2_plane_vaddr(vb2_buf, 0); 478 int ret; 479 480 ret = data->chip->xfer(data, vbuf); 481 vb2_buf->timestamp = ktime_get_ns(); 482 vid_cap_buf->vb.sequence = data->sequence++; 483 vb2_buffer_done(vb2_buf, ret ? 484 VB2_BUF_STATE_ERROR : VB2_BUF_STATE_DONE); 485 } 486 487 end_us += delay; 488 current_us = ktime_to_us(ktime_get()); 489 if (current_us < end_us) { 490 schedule_delay = end_us - current_us; 491 usleep_range(schedule_delay * 3 / 4, schedule_delay); 492 } else { 493 end_us = current_us; 494 } 495 } while (!kthread_should_stop()); 496 497 return 0; 498 } 499 500 static void video_i2c_del_list(struct vb2_queue *vq, enum vb2_buffer_state state) 501 { 502 struct video_i2c_data *data = vb2_get_drv_priv(vq); 503 struct video_i2c_buffer *buf, *tmp; 504 505 spin_lock(&data->slock); 506 507 list_for_each_entry_safe(buf, tmp, &data->vid_cap_active, list) { 508 list_del(&buf->list); 509 vb2_buffer_done(&buf->vb.vb2_buf, state); 510 } 511 512 spin_unlock(&data->slock); 513 } 514 515 static int start_streaming(struct vb2_queue *vq, unsigned int count) 516 { 517 struct video_i2c_data *data = vb2_get_drv_priv(vq); 518 struct device *dev = regmap_get_device(data->regmap); 519 int ret; 520 521 if (data->kthread_vid_cap) 522 return 0; 523 524 ret = pm_runtime_resume_and_get(dev); 525 if (ret < 0) 526 goto error_del_list; 527 528 ret = data->chip->setup(data); 529 if (ret) 530 goto error_rpm_put; 531 532 data->sequence = 0; 533 data->kthread_vid_cap = kthread_run(video_i2c_thread_vid_cap, data, 534 "%s-vid-cap", data->v4l2_dev.name); 535 ret = PTR_ERR_OR_ZERO(data->kthread_vid_cap); 536 if (!ret) 537 return 0; 538 539 error_rpm_put: 540 pm_runtime_mark_last_busy(dev); 541 pm_runtime_put_autosuspend(dev); 542 error_del_list: 543 video_i2c_del_list(vq, VB2_BUF_STATE_QUEUED); 544 545 return ret; 546 } 547 548 static void stop_streaming(struct vb2_queue *vq) 549 { 550 struct video_i2c_data *data = vb2_get_drv_priv(vq); 551 552 if (data->kthread_vid_cap == NULL) 553 return; 554 555 kthread_stop(data->kthread_vid_cap); 556 data->kthread_vid_cap = NULL; 557 pm_runtime_mark_last_busy(regmap_get_device(data->regmap)); 558 pm_runtime_put_autosuspend(regmap_get_device(data->regmap)); 559 560 video_i2c_del_list(vq, VB2_BUF_STATE_ERROR); 561 } 562 563 static const struct vb2_ops video_i2c_video_qops = { 564 .queue_setup = queue_setup, 565 .buf_prepare = buffer_prepare, 566 .buf_queue = buffer_queue, 567 .start_streaming = start_streaming, 568 .stop_streaming = stop_streaming, 569 }; 570 571 static int video_i2c_querycap(struct file *file, void *priv, 572 struct v4l2_capability *vcap) 573 { 574 struct video_i2c_data *data = video_drvdata(file); 575 struct device *dev = regmap_get_device(data->regmap); 576 struct i2c_client *client = to_i2c_client(dev); 577 578 strscpy(vcap->driver, data->v4l2_dev.name, sizeof(vcap->driver)); 579 strscpy(vcap->card, data->vdev.name, sizeof(vcap->card)); 580 581 sprintf(vcap->bus_info, "I2C:%d-%d", client->adapter->nr, client->addr); 582 583 return 0; 584 } 585 586 static int video_i2c_g_input(struct file *file, void *fh, unsigned int *inp) 587 { 588 *inp = 0; 589 590 return 0; 591 } 592 593 static int video_i2c_s_input(struct file *file, void *fh, unsigned int inp) 594 { 595 return (inp > 0) ? -EINVAL : 0; 596 } 597 598 static int video_i2c_enum_input(struct file *file, void *fh, 599 struct v4l2_input *vin) 600 { 601 if (vin->index > 0) 602 return -EINVAL; 603 604 strscpy(vin->name, "Camera", sizeof(vin->name)); 605 606 vin->type = V4L2_INPUT_TYPE_CAMERA; 607 608 return 0; 609 } 610 611 static int video_i2c_enum_fmt_vid_cap(struct file *file, void *fh, 612 struct v4l2_fmtdesc *fmt) 613 { 614 struct video_i2c_data *data = video_drvdata(file); 615 enum v4l2_buf_type type = fmt->type; 616 617 if (fmt->index > 0) 618 return -EINVAL; 619 620 *fmt = *data->chip->format; 621 fmt->type = type; 622 623 return 0; 624 } 625 626 static int video_i2c_enum_framesizes(struct file *file, void *fh, 627 struct v4l2_frmsizeenum *fsize) 628 { 629 const struct video_i2c_data *data = video_drvdata(file); 630 const struct v4l2_frmsize_discrete *size = data->chip->size; 631 632 /* currently only one frame size is allowed */ 633 if (fsize->index > 0) 634 return -EINVAL; 635 636 if (fsize->pixel_format != data->chip->format->pixelformat) 637 return -EINVAL; 638 639 fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE; 640 fsize->discrete.width = size->width; 641 fsize->discrete.height = size->height; 642 643 return 0; 644 } 645 646 static int video_i2c_enum_frameintervals(struct file *file, void *priv, 647 struct v4l2_frmivalenum *fe) 648 { 649 const struct video_i2c_data *data = video_drvdata(file); 650 const struct v4l2_frmsize_discrete *size = data->chip->size; 651 652 if (fe->index >= data->chip->num_frame_intervals) 653 return -EINVAL; 654 655 if (fe->width != size->width || fe->height != size->height) 656 return -EINVAL; 657 658 fe->type = V4L2_FRMIVAL_TYPE_DISCRETE; 659 fe->discrete = data->chip->frame_intervals[fe->index]; 660 661 return 0; 662 } 663 664 static int video_i2c_try_fmt_vid_cap(struct file *file, void *fh, 665 struct v4l2_format *fmt) 666 { 667 const struct video_i2c_data *data = video_drvdata(file); 668 const struct v4l2_frmsize_discrete *size = data->chip->size; 669 struct v4l2_pix_format *pix = &fmt->fmt.pix; 670 unsigned int bpp = data->chip->bpp / 8; 671 672 pix->width = size->width; 673 pix->height = size->height; 674 pix->pixelformat = data->chip->format->pixelformat; 675 pix->field = V4L2_FIELD_NONE; 676 pix->bytesperline = pix->width * bpp; 677 pix->sizeimage = pix->bytesperline * pix->height; 678 pix->colorspace = V4L2_COLORSPACE_RAW; 679 680 return 0; 681 } 682 683 static int video_i2c_s_fmt_vid_cap(struct file *file, void *fh, 684 struct v4l2_format *fmt) 685 { 686 struct video_i2c_data *data = video_drvdata(file); 687 688 if (vb2_is_busy(&data->vb_vidq)) 689 return -EBUSY; 690 691 return video_i2c_try_fmt_vid_cap(file, fh, fmt); 692 } 693 694 static int video_i2c_g_parm(struct file *filp, void *priv, 695 struct v4l2_streamparm *parm) 696 { 697 struct video_i2c_data *data = video_drvdata(filp); 698 699 if (parm->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) 700 return -EINVAL; 701 702 parm->parm.capture.readbuffers = 1; 703 parm->parm.capture.capability = V4L2_CAP_TIMEPERFRAME; 704 parm->parm.capture.timeperframe = data->frame_interval; 705 706 return 0; 707 } 708 709 static int video_i2c_s_parm(struct file *filp, void *priv, 710 struct v4l2_streamparm *parm) 711 { 712 struct video_i2c_data *data = video_drvdata(filp); 713 int i; 714 715 for (i = 0; i < data->chip->num_frame_intervals - 1; i++) { 716 if (V4L2_FRACT_COMPARE(parm->parm.capture.timeperframe, <=, 717 data->chip->frame_intervals[i])) 718 break; 719 } 720 data->frame_interval = data->chip->frame_intervals[i]; 721 722 return video_i2c_g_parm(filp, priv, parm); 723 } 724 725 static const struct v4l2_ioctl_ops video_i2c_ioctl_ops = { 726 .vidioc_querycap = video_i2c_querycap, 727 .vidioc_g_input = video_i2c_g_input, 728 .vidioc_s_input = video_i2c_s_input, 729 .vidioc_enum_input = video_i2c_enum_input, 730 .vidioc_enum_fmt_vid_cap = video_i2c_enum_fmt_vid_cap, 731 .vidioc_enum_framesizes = video_i2c_enum_framesizes, 732 .vidioc_enum_frameintervals = video_i2c_enum_frameintervals, 733 .vidioc_g_fmt_vid_cap = video_i2c_try_fmt_vid_cap, 734 .vidioc_s_fmt_vid_cap = video_i2c_s_fmt_vid_cap, 735 .vidioc_g_parm = video_i2c_g_parm, 736 .vidioc_s_parm = video_i2c_s_parm, 737 .vidioc_try_fmt_vid_cap = video_i2c_try_fmt_vid_cap, 738 .vidioc_reqbufs = vb2_ioctl_reqbufs, 739 .vidioc_create_bufs = vb2_ioctl_create_bufs, 740 .vidioc_prepare_buf = vb2_ioctl_prepare_buf, 741 .vidioc_querybuf = vb2_ioctl_querybuf, 742 .vidioc_qbuf = vb2_ioctl_qbuf, 743 .vidioc_dqbuf = vb2_ioctl_dqbuf, 744 .vidioc_streamon = vb2_ioctl_streamon, 745 .vidioc_streamoff = vb2_ioctl_streamoff, 746 }; 747 748 static void video_i2c_release(struct video_device *vdev) 749 { 750 struct video_i2c_data *data = video_get_drvdata(vdev); 751 752 v4l2_device_unregister(&data->v4l2_dev); 753 mutex_destroy(&data->lock); 754 mutex_destroy(&data->queue_lock); 755 regmap_exit(data->regmap); 756 kfree(data); 757 } 758 759 static int video_i2c_probe(struct i2c_client *client) 760 { 761 struct video_i2c_data *data; 762 struct v4l2_device *v4l2_dev; 763 struct vb2_queue *queue; 764 int ret = -ENODEV; 765 766 data = kzalloc(sizeof(*data), GFP_KERNEL); 767 if (!data) 768 return -ENOMEM; 769 770 data->chip = i2c_get_match_data(client); 771 if (!data->chip) 772 goto error_free_device; 773 774 data->regmap = regmap_init_i2c(client, data->chip->regmap_config); 775 if (IS_ERR(data->regmap)) { 776 ret = PTR_ERR(data->regmap); 777 goto error_free_device; 778 } 779 780 v4l2_dev = &data->v4l2_dev; 781 strscpy(v4l2_dev->name, VIDEO_I2C_DRIVER, sizeof(v4l2_dev->name)); 782 783 ret = v4l2_device_register(&client->dev, v4l2_dev); 784 if (ret < 0) 785 goto error_regmap_exit; 786 787 mutex_init(&data->lock); 788 mutex_init(&data->queue_lock); 789 790 queue = &data->vb_vidq; 791 queue->type = V4L2_BUF_TYPE_VIDEO_CAPTURE; 792 queue->io_modes = VB2_DMABUF | VB2_MMAP | VB2_USERPTR | VB2_READ; 793 queue->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC; 794 queue->drv_priv = data; 795 queue->buf_struct_size = sizeof(struct video_i2c_buffer); 796 queue->min_queued_buffers = 1; 797 queue->ops = &video_i2c_video_qops; 798 queue->mem_ops = &vb2_vmalloc_memops; 799 queue->lock = &data->queue_lock; 800 801 ret = vb2_queue_init(queue); 802 if (ret < 0) 803 goto error_unregister_device; 804 805 data->vdev.queue = queue; 806 807 snprintf(data->vdev.name, sizeof(data->vdev.name), 808 "I2C %d-%d Transport Video", 809 client->adapter->nr, client->addr); 810 811 data->vdev.v4l2_dev = v4l2_dev; 812 data->vdev.fops = &video_i2c_fops; 813 data->vdev.lock = &data->lock; 814 data->vdev.ioctl_ops = &video_i2c_ioctl_ops; 815 data->vdev.release = video_i2c_release; 816 data->vdev.device_caps = V4L2_CAP_VIDEO_CAPTURE | 817 V4L2_CAP_READWRITE | V4L2_CAP_STREAMING; 818 819 spin_lock_init(&data->slock); 820 INIT_LIST_HEAD(&data->vid_cap_active); 821 822 data->frame_interval = data->chip->frame_intervals[0]; 823 824 video_set_drvdata(&data->vdev, data); 825 i2c_set_clientdata(client, data); 826 827 if (data->chip->set_power) { 828 ret = data->chip->set_power(data, true); 829 if (ret) 830 goto error_unregister_device; 831 } 832 833 pm_runtime_get_noresume(&client->dev); 834 pm_runtime_set_active(&client->dev); 835 pm_runtime_enable(&client->dev); 836 pm_runtime_set_autosuspend_delay(&client->dev, 2000); 837 pm_runtime_use_autosuspend(&client->dev); 838 839 if (data->chip->hwmon_init) { 840 ret = data->chip->hwmon_init(data); 841 if (ret < 0) { 842 dev_warn(&client->dev, 843 "failed to register hwmon device\n"); 844 } 845 } 846 847 if (data->chip->nvmem_config) { 848 struct nvmem_config *config = data->chip->nvmem_config; 849 struct nvmem_device *device; 850 851 config->priv = data; 852 config->dev = &client->dev; 853 854 device = devm_nvmem_register(&client->dev, config); 855 856 if (IS_ERR(device)) { 857 dev_warn(&client->dev, 858 "failed to register nvmem device\n"); 859 } 860 } 861 862 ret = video_register_device(&data->vdev, VFL_TYPE_VIDEO, -1); 863 if (ret < 0) 864 goto error_pm_disable; 865 866 pm_runtime_mark_last_busy(&client->dev); 867 pm_runtime_put_autosuspend(&client->dev); 868 869 return 0; 870 871 error_pm_disable: 872 pm_runtime_disable(&client->dev); 873 pm_runtime_set_suspended(&client->dev); 874 pm_runtime_put_noidle(&client->dev); 875 876 if (data->chip->set_power) 877 data->chip->set_power(data, false); 878 879 error_unregister_device: 880 v4l2_device_unregister(v4l2_dev); 881 mutex_destroy(&data->lock); 882 mutex_destroy(&data->queue_lock); 883 884 error_regmap_exit: 885 regmap_exit(data->regmap); 886 887 error_free_device: 888 kfree(data); 889 890 return ret; 891 } 892 893 static void video_i2c_remove(struct i2c_client *client) 894 { 895 struct video_i2c_data *data = i2c_get_clientdata(client); 896 897 pm_runtime_get_sync(&client->dev); 898 pm_runtime_disable(&client->dev); 899 pm_runtime_set_suspended(&client->dev); 900 pm_runtime_put_noidle(&client->dev); 901 902 if (data->chip->set_power) 903 data->chip->set_power(data, false); 904 905 video_unregister_device(&data->vdev); 906 } 907 908 #ifdef CONFIG_PM 909 910 static int video_i2c_pm_runtime_suspend(struct device *dev) 911 { 912 struct video_i2c_data *data = i2c_get_clientdata(to_i2c_client(dev)); 913 914 if (!data->chip->set_power) 915 return 0; 916 917 return data->chip->set_power(data, false); 918 } 919 920 static int video_i2c_pm_runtime_resume(struct device *dev) 921 { 922 struct video_i2c_data *data = i2c_get_clientdata(to_i2c_client(dev)); 923 924 if (!data->chip->set_power) 925 return 0; 926 927 return data->chip->set_power(data, true); 928 } 929 930 #endif 931 932 static const struct dev_pm_ops video_i2c_pm_ops = { 933 SET_RUNTIME_PM_OPS(video_i2c_pm_runtime_suspend, 934 video_i2c_pm_runtime_resume, NULL) 935 }; 936 937 static const struct i2c_device_id video_i2c_id_table[] = { 938 { "amg88xx", (kernel_ulong_t)&video_i2c_chip[AMG88XX] }, 939 { "mlx90640", (kernel_ulong_t)&video_i2c_chip[MLX90640] }, 940 {} 941 }; 942 MODULE_DEVICE_TABLE(i2c, video_i2c_id_table); 943 944 static const struct of_device_id video_i2c_of_match[] = { 945 { .compatible = "panasonic,amg88xx", .data = &video_i2c_chip[AMG88XX] }, 946 { .compatible = "melexis,mlx90640", .data = &video_i2c_chip[MLX90640] }, 947 {} 948 }; 949 MODULE_DEVICE_TABLE(of, video_i2c_of_match); 950 951 static struct i2c_driver video_i2c_driver = { 952 .driver = { 953 .name = VIDEO_I2C_DRIVER, 954 .of_match_table = video_i2c_of_match, 955 .pm = &video_i2c_pm_ops, 956 }, 957 .probe = video_i2c_probe, 958 .remove = video_i2c_remove, 959 .id_table = video_i2c_id_table, 960 }; 961 962 module_i2c_driver(video_i2c_driver); 963 964 MODULE_AUTHOR("Matt Ranostay <matt.ranostay@konsulko.com>"); 965 MODULE_DESCRIPTION("I2C transport video support"); 966 MODULE_LICENSE("GPL v2"); 967