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 struct hwmon_channel_info * const amg88xx_info[] = { 268 HWMON_CHANNEL_INFO(temp, HWMON_T_INPUT), 269 NULL 270 }; 271 272 static umode_t amg88xx_is_visible(const void *drvdata, 273 enum hwmon_sensor_types type, 274 u32 attr, int channel) 275 { 276 return 0444; 277 } 278 279 static int amg88xx_read(struct device *dev, enum hwmon_sensor_types type, 280 u32 attr, int channel, long *val) 281 { 282 struct video_i2c_data *data = dev_get_drvdata(dev); 283 __le16 buf; 284 int tmp; 285 286 tmp = pm_runtime_resume_and_get(regmap_get_device(data->regmap)); 287 if (tmp < 0) 288 return tmp; 289 290 tmp = regmap_bulk_read(data->regmap, AMG88XX_REG_TTHL, &buf, 2); 291 pm_runtime_mark_last_busy(regmap_get_device(data->regmap)); 292 pm_runtime_put_autosuspend(regmap_get_device(data->regmap)); 293 if (tmp) 294 return tmp; 295 296 tmp = le16_to_cpu(buf); 297 298 /* 299 * Check for sign bit, this isn't a two's complement value but an 300 * absolute temperature that needs to be inverted in the case of being 301 * negative. 302 */ 303 if (tmp & BIT(11)) 304 tmp = -(tmp & 0x7ff); 305 306 *val = (tmp * 625) / 10; 307 308 return 0; 309 } 310 311 static const struct hwmon_ops amg88xx_hwmon_ops = { 312 .is_visible = amg88xx_is_visible, 313 .read = amg88xx_read, 314 }; 315 316 static const struct hwmon_chip_info amg88xx_chip_info = { 317 .ops = &amg88xx_hwmon_ops, 318 .info = amg88xx_info, 319 }; 320 321 static int amg88xx_hwmon_init(struct video_i2c_data *data) 322 { 323 struct device *dev = regmap_get_device(data->regmap); 324 void *hwmon = devm_hwmon_device_register_with_info(dev, "amg88xx", data, 325 &amg88xx_chip_info, NULL); 326 327 return PTR_ERR_OR_ZERO(hwmon); 328 } 329 #else 330 #define amg88xx_hwmon_init NULL 331 #endif 332 333 enum { 334 AMG88XX, 335 MLX90640, 336 }; 337 338 static const struct v4l2_fract amg88xx_frame_intervals[] = { 339 { 1, 10 }, 340 { 1, 1 }, 341 }; 342 343 static const struct v4l2_fract mlx90640_frame_intervals[] = { 344 { 1, 64 }, 345 { 1, 32 }, 346 { 1, 16 }, 347 { 1, 8 }, 348 { 1, 4 }, 349 { 1, 2 }, 350 { 1, 1 }, 351 { 2, 1 }, 352 }; 353 354 static const struct video_i2c_chip video_i2c_chip[] = { 355 [AMG88XX] = { 356 .size = &amg88xx_size, 357 .format = &amg88xx_format, 358 .frame_intervals = amg88xx_frame_intervals, 359 .num_frame_intervals = ARRAY_SIZE(amg88xx_frame_intervals), 360 .buffer_size = 128, 361 .bpp = 16, 362 .regmap_config = &amg88xx_regmap_config, 363 .setup = &amg88xx_setup, 364 .xfer = &amg88xx_xfer, 365 .set_power = amg88xx_set_power, 366 .hwmon_init = amg88xx_hwmon_init, 367 }, 368 [MLX90640] = { 369 .size = &mlx90640_size, 370 .format = &mlx90640_format, 371 .frame_intervals = mlx90640_frame_intervals, 372 .num_frame_intervals = ARRAY_SIZE(mlx90640_frame_intervals), 373 .buffer_size = 1664, 374 .bpp = 16, 375 .regmap_config = &mlx90640_regmap_config, 376 .nvmem_config = &mlx90640_nvram_config, 377 .setup = mlx90640_setup, 378 .xfer = mlx90640_xfer, 379 }, 380 }; 381 382 static const struct v4l2_file_operations video_i2c_fops = { 383 .owner = THIS_MODULE, 384 .open = v4l2_fh_open, 385 .release = vb2_fop_release, 386 .poll = vb2_fop_poll, 387 .read = vb2_fop_read, 388 .mmap = vb2_fop_mmap, 389 .unlocked_ioctl = video_ioctl2, 390 }; 391 392 static int queue_setup(struct vb2_queue *vq, 393 unsigned int *nbuffers, unsigned int *nplanes, 394 unsigned int sizes[], struct device *alloc_devs[]) 395 { 396 struct video_i2c_data *data = vb2_get_drv_priv(vq); 397 unsigned int size = data->chip->buffer_size; 398 unsigned int q_num_bufs = vb2_get_num_buffers(vq); 399 400 if (q_num_bufs + *nbuffers < 2) 401 *nbuffers = 2 - q_num_bufs; 402 403 if (*nplanes) 404 return sizes[0] < size ? -EINVAL : 0; 405 406 *nplanes = 1; 407 sizes[0] = size; 408 409 return 0; 410 } 411 412 static int buffer_prepare(struct vb2_buffer *vb) 413 { 414 struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb); 415 struct video_i2c_data *data = vb2_get_drv_priv(vb->vb2_queue); 416 unsigned int size = data->chip->buffer_size; 417 418 if (vb2_plane_size(vb, 0) < size) 419 return -EINVAL; 420 421 vbuf->field = V4L2_FIELD_NONE; 422 vb2_set_plane_payload(vb, 0, size); 423 424 return 0; 425 } 426 427 static void buffer_queue(struct vb2_buffer *vb) 428 { 429 struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb); 430 struct video_i2c_data *data = vb2_get_drv_priv(vb->vb2_queue); 431 struct video_i2c_buffer *buf = 432 container_of(vbuf, struct video_i2c_buffer, vb); 433 434 spin_lock(&data->slock); 435 list_add_tail(&buf->list, &data->vid_cap_active); 436 spin_unlock(&data->slock); 437 } 438 439 static int video_i2c_thread_vid_cap(void *priv) 440 { 441 struct video_i2c_data *data = priv; 442 u32 delay = mult_frac(1000000UL, data->frame_interval.numerator, 443 data->frame_interval.denominator); 444 s64 end_us = ktime_to_us(ktime_get()); 445 446 set_freezable(); 447 448 do { 449 struct video_i2c_buffer *vid_cap_buf = NULL; 450 s64 current_us; 451 int schedule_delay; 452 453 try_to_freeze(); 454 455 spin_lock(&data->slock); 456 457 if (!list_empty(&data->vid_cap_active)) { 458 vid_cap_buf = list_last_entry(&data->vid_cap_active, 459 struct video_i2c_buffer, list); 460 list_del(&vid_cap_buf->list); 461 } 462 463 spin_unlock(&data->slock); 464 465 if (vid_cap_buf) { 466 struct vb2_buffer *vb2_buf = &vid_cap_buf->vb.vb2_buf; 467 void *vbuf = vb2_plane_vaddr(vb2_buf, 0); 468 int ret; 469 470 ret = data->chip->xfer(data, vbuf); 471 vb2_buf->timestamp = ktime_get_ns(); 472 vid_cap_buf->vb.sequence = data->sequence++; 473 vb2_buffer_done(vb2_buf, ret ? 474 VB2_BUF_STATE_ERROR : VB2_BUF_STATE_DONE); 475 } 476 477 end_us += delay; 478 current_us = ktime_to_us(ktime_get()); 479 if (current_us < end_us) { 480 schedule_delay = end_us - current_us; 481 usleep_range(schedule_delay * 3 / 4, schedule_delay); 482 } else { 483 end_us = current_us; 484 } 485 } while (!kthread_should_stop()); 486 487 return 0; 488 } 489 490 static void video_i2c_del_list(struct vb2_queue *vq, enum vb2_buffer_state state) 491 { 492 struct video_i2c_data *data = vb2_get_drv_priv(vq); 493 struct video_i2c_buffer *buf, *tmp; 494 495 spin_lock(&data->slock); 496 497 list_for_each_entry_safe(buf, tmp, &data->vid_cap_active, list) { 498 list_del(&buf->list); 499 vb2_buffer_done(&buf->vb.vb2_buf, state); 500 } 501 502 spin_unlock(&data->slock); 503 } 504 505 static int start_streaming(struct vb2_queue *vq, unsigned int count) 506 { 507 struct video_i2c_data *data = vb2_get_drv_priv(vq); 508 struct device *dev = regmap_get_device(data->regmap); 509 int ret; 510 511 if (data->kthread_vid_cap) 512 return 0; 513 514 ret = pm_runtime_resume_and_get(dev); 515 if (ret < 0) 516 goto error_del_list; 517 518 ret = data->chip->setup(data); 519 if (ret) 520 goto error_rpm_put; 521 522 data->sequence = 0; 523 data->kthread_vid_cap = kthread_run(video_i2c_thread_vid_cap, data, 524 "%s-vid-cap", data->v4l2_dev.name); 525 ret = PTR_ERR_OR_ZERO(data->kthread_vid_cap); 526 if (!ret) 527 return 0; 528 529 error_rpm_put: 530 pm_runtime_mark_last_busy(dev); 531 pm_runtime_put_autosuspend(dev); 532 error_del_list: 533 video_i2c_del_list(vq, VB2_BUF_STATE_QUEUED); 534 535 return ret; 536 } 537 538 static void stop_streaming(struct vb2_queue *vq) 539 { 540 struct video_i2c_data *data = vb2_get_drv_priv(vq); 541 542 if (data->kthread_vid_cap == NULL) 543 return; 544 545 kthread_stop(data->kthread_vid_cap); 546 data->kthread_vid_cap = NULL; 547 pm_runtime_mark_last_busy(regmap_get_device(data->regmap)); 548 pm_runtime_put_autosuspend(regmap_get_device(data->regmap)); 549 550 video_i2c_del_list(vq, VB2_BUF_STATE_ERROR); 551 } 552 553 static const struct vb2_ops video_i2c_video_qops = { 554 .queue_setup = queue_setup, 555 .buf_prepare = buffer_prepare, 556 .buf_queue = buffer_queue, 557 .start_streaming = start_streaming, 558 .stop_streaming = stop_streaming, 559 }; 560 561 static int video_i2c_querycap(struct file *file, void *priv, 562 struct v4l2_capability *vcap) 563 { 564 struct video_i2c_data *data = video_drvdata(file); 565 struct device *dev = regmap_get_device(data->regmap); 566 struct i2c_client *client = to_i2c_client(dev); 567 568 strscpy(vcap->driver, data->v4l2_dev.name, sizeof(vcap->driver)); 569 strscpy(vcap->card, data->vdev.name, sizeof(vcap->card)); 570 571 sprintf(vcap->bus_info, "I2C:%d-%d", client->adapter->nr, client->addr); 572 573 return 0; 574 } 575 576 static int video_i2c_g_input(struct file *file, void *fh, unsigned int *inp) 577 { 578 *inp = 0; 579 580 return 0; 581 } 582 583 static int video_i2c_s_input(struct file *file, void *fh, unsigned int inp) 584 { 585 return (inp > 0) ? -EINVAL : 0; 586 } 587 588 static int video_i2c_enum_input(struct file *file, void *fh, 589 struct v4l2_input *vin) 590 { 591 if (vin->index > 0) 592 return -EINVAL; 593 594 strscpy(vin->name, "Camera", sizeof(vin->name)); 595 596 vin->type = V4L2_INPUT_TYPE_CAMERA; 597 598 return 0; 599 } 600 601 static int video_i2c_enum_fmt_vid_cap(struct file *file, void *fh, 602 struct v4l2_fmtdesc *fmt) 603 { 604 struct video_i2c_data *data = video_drvdata(file); 605 enum v4l2_buf_type type = fmt->type; 606 607 if (fmt->index > 0) 608 return -EINVAL; 609 610 *fmt = *data->chip->format; 611 fmt->type = type; 612 613 return 0; 614 } 615 616 static int video_i2c_enum_framesizes(struct file *file, void *fh, 617 struct v4l2_frmsizeenum *fsize) 618 { 619 const struct video_i2c_data *data = video_drvdata(file); 620 const struct v4l2_frmsize_discrete *size = data->chip->size; 621 622 /* currently only one frame size is allowed */ 623 if (fsize->index > 0) 624 return -EINVAL; 625 626 if (fsize->pixel_format != data->chip->format->pixelformat) 627 return -EINVAL; 628 629 fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE; 630 fsize->discrete.width = size->width; 631 fsize->discrete.height = size->height; 632 633 return 0; 634 } 635 636 static int video_i2c_enum_frameintervals(struct file *file, void *priv, 637 struct v4l2_frmivalenum *fe) 638 { 639 const struct video_i2c_data *data = video_drvdata(file); 640 const struct v4l2_frmsize_discrete *size = data->chip->size; 641 642 if (fe->index >= data->chip->num_frame_intervals) 643 return -EINVAL; 644 645 if (fe->width != size->width || fe->height != size->height) 646 return -EINVAL; 647 648 fe->type = V4L2_FRMIVAL_TYPE_DISCRETE; 649 fe->discrete = data->chip->frame_intervals[fe->index]; 650 651 return 0; 652 } 653 654 static int video_i2c_try_fmt_vid_cap(struct file *file, void *fh, 655 struct v4l2_format *fmt) 656 { 657 const struct video_i2c_data *data = video_drvdata(file); 658 const struct v4l2_frmsize_discrete *size = data->chip->size; 659 struct v4l2_pix_format *pix = &fmt->fmt.pix; 660 unsigned int bpp = data->chip->bpp / 8; 661 662 pix->width = size->width; 663 pix->height = size->height; 664 pix->pixelformat = data->chip->format->pixelformat; 665 pix->field = V4L2_FIELD_NONE; 666 pix->bytesperline = pix->width * bpp; 667 pix->sizeimage = pix->bytesperline * pix->height; 668 pix->colorspace = V4L2_COLORSPACE_RAW; 669 670 return 0; 671 } 672 673 static int video_i2c_s_fmt_vid_cap(struct file *file, void *fh, 674 struct v4l2_format *fmt) 675 { 676 struct video_i2c_data *data = video_drvdata(file); 677 678 if (vb2_is_busy(&data->vb_vidq)) 679 return -EBUSY; 680 681 return video_i2c_try_fmt_vid_cap(file, fh, fmt); 682 } 683 684 static int video_i2c_g_parm(struct file *filp, void *priv, 685 struct v4l2_streamparm *parm) 686 { 687 struct video_i2c_data *data = video_drvdata(filp); 688 689 if (parm->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) 690 return -EINVAL; 691 692 parm->parm.capture.readbuffers = 1; 693 parm->parm.capture.capability = V4L2_CAP_TIMEPERFRAME; 694 parm->parm.capture.timeperframe = data->frame_interval; 695 696 return 0; 697 } 698 699 static int video_i2c_s_parm(struct file *filp, void *priv, 700 struct v4l2_streamparm *parm) 701 { 702 struct video_i2c_data *data = video_drvdata(filp); 703 int i; 704 705 for (i = 0; i < data->chip->num_frame_intervals - 1; i++) { 706 if (V4L2_FRACT_COMPARE(parm->parm.capture.timeperframe, <=, 707 data->chip->frame_intervals[i])) 708 break; 709 } 710 data->frame_interval = data->chip->frame_intervals[i]; 711 712 return video_i2c_g_parm(filp, priv, parm); 713 } 714 715 static const struct v4l2_ioctl_ops video_i2c_ioctl_ops = { 716 .vidioc_querycap = video_i2c_querycap, 717 .vidioc_g_input = video_i2c_g_input, 718 .vidioc_s_input = video_i2c_s_input, 719 .vidioc_enum_input = video_i2c_enum_input, 720 .vidioc_enum_fmt_vid_cap = video_i2c_enum_fmt_vid_cap, 721 .vidioc_enum_framesizes = video_i2c_enum_framesizes, 722 .vidioc_enum_frameintervals = video_i2c_enum_frameintervals, 723 .vidioc_g_fmt_vid_cap = video_i2c_try_fmt_vid_cap, 724 .vidioc_s_fmt_vid_cap = video_i2c_s_fmt_vid_cap, 725 .vidioc_g_parm = video_i2c_g_parm, 726 .vidioc_s_parm = video_i2c_s_parm, 727 .vidioc_try_fmt_vid_cap = video_i2c_try_fmt_vid_cap, 728 .vidioc_reqbufs = vb2_ioctl_reqbufs, 729 .vidioc_create_bufs = vb2_ioctl_create_bufs, 730 .vidioc_prepare_buf = vb2_ioctl_prepare_buf, 731 .vidioc_querybuf = vb2_ioctl_querybuf, 732 .vidioc_qbuf = vb2_ioctl_qbuf, 733 .vidioc_dqbuf = vb2_ioctl_dqbuf, 734 .vidioc_streamon = vb2_ioctl_streamon, 735 .vidioc_streamoff = vb2_ioctl_streamoff, 736 }; 737 738 static void video_i2c_release(struct video_device *vdev) 739 { 740 struct video_i2c_data *data = video_get_drvdata(vdev); 741 742 v4l2_device_unregister(&data->v4l2_dev); 743 mutex_destroy(&data->lock); 744 mutex_destroy(&data->queue_lock); 745 regmap_exit(data->regmap); 746 kfree(data); 747 } 748 749 static int video_i2c_probe(struct i2c_client *client) 750 { 751 struct video_i2c_data *data; 752 struct v4l2_device *v4l2_dev; 753 struct vb2_queue *queue; 754 int ret = -ENODEV; 755 756 data = kzalloc(sizeof(*data), GFP_KERNEL); 757 if (!data) 758 return -ENOMEM; 759 760 data->chip = i2c_get_match_data(client); 761 if (!data->chip) 762 goto error_free_device; 763 764 data->regmap = regmap_init_i2c(client, data->chip->regmap_config); 765 if (IS_ERR(data->regmap)) { 766 ret = PTR_ERR(data->regmap); 767 goto error_free_device; 768 } 769 770 v4l2_dev = &data->v4l2_dev; 771 strscpy(v4l2_dev->name, VIDEO_I2C_DRIVER, sizeof(v4l2_dev->name)); 772 773 ret = v4l2_device_register(&client->dev, v4l2_dev); 774 if (ret < 0) 775 goto error_regmap_exit; 776 777 mutex_init(&data->lock); 778 mutex_init(&data->queue_lock); 779 780 queue = &data->vb_vidq; 781 queue->type = V4L2_BUF_TYPE_VIDEO_CAPTURE; 782 queue->io_modes = VB2_DMABUF | VB2_MMAP | VB2_USERPTR | VB2_READ; 783 queue->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC; 784 queue->drv_priv = data; 785 queue->buf_struct_size = sizeof(struct video_i2c_buffer); 786 queue->min_queued_buffers = 1; 787 queue->ops = &video_i2c_video_qops; 788 queue->mem_ops = &vb2_vmalloc_memops; 789 queue->lock = &data->queue_lock; 790 791 ret = vb2_queue_init(queue); 792 if (ret < 0) 793 goto error_unregister_device; 794 795 data->vdev.queue = queue; 796 797 snprintf(data->vdev.name, sizeof(data->vdev.name), 798 "I2C %d-%d Transport Video", 799 client->adapter->nr, client->addr); 800 801 data->vdev.v4l2_dev = v4l2_dev; 802 data->vdev.fops = &video_i2c_fops; 803 data->vdev.lock = &data->lock; 804 data->vdev.ioctl_ops = &video_i2c_ioctl_ops; 805 data->vdev.release = video_i2c_release; 806 data->vdev.device_caps = V4L2_CAP_VIDEO_CAPTURE | 807 V4L2_CAP_READWRITE | V4L2_CAP_STREAMING; 808 809 spin_lock_init(&data->slock); 810 INIT_LIST_HEAD(&data->vid_cap_active); 811 812 data->frame_interval = data->chip->frame_intervals[0]; 813 814 video_set_drvdata(&data->vdev, data); 815 i2c_set_clientdata(client, data); 816 817 if (data->chip->set_power) { 818 ret = data->chip->set_power(data, true); 819 if (ret) 820 goto error_unregister_device; 821 } 822 823 pm_runtime_get_noresume(&client->dev); 824 pm_runtime_set_active(&client->dev); 825 pm_runtime_enable(&client->dev); 826 pm_runtime_set_autosuspend_delay(&client->dev, 2000); 827 pm_runtime_use_autosuspend(&client->dev); 828 829 if (data->chip->hwmon_init) { 830 ret = data->chip->hwmon_init(data); 831 if (ret < 0) { 832 dev_warn(&client->dev, 833 "failed to register hwmon device\n"); 834 } 835 } 836 837 if (data->chip->nvmem_config) { 838 struct nvmem_config *config = data->chip->nvmem_config; 839 struct nvmem_device *device; 840 841 config->priv = data; 842 config->dev = &client->dev; 843 844 device = devm_nvmem_register(&client->dev, config); 845 846 if (IS_ERR(device)) { 847 dev_warn(&client->dev, 848 "failed to register nvmem device\n"); 849 } 850 } 851 852 ret = video_register_device(&data->vdev, VFL_TYPE_VIDEO, -1); 853 if (ret < 0) 854 goto error_pm_disable; 855 856 pm_runtime_mark_last_busy(&client->dev); 857 pm_runtime_put_autosuspend(&client->dev); 858 859 return 0; 860 861 error_pm_disable: 862 pm_runtime_disable(&client->dev); 863 pm_runtime_set_suspended(&client->dev); 864 pm_runtime_put_noidle(&client->dev); 865 866 if (data->chip->set_power) 867 data->chip->set_power(data, false); 868 869 error_unregister_device: 870 v4l2_device_unregister(v4l2_dev); 871 mutex_destroy(&data->lock); 872 mutex_destroy(&data->queue_lock); 873 874 error_regmap_exit: 875 regmap_exit(data->regmap); 876 877 error_free_device: 878 kfree(data); 879 880 return ret; 881 } 882 883 static void video_i2c_remove(struct i2c_client *client) 884 { 885 struct video_i2c_data *data = i2c_get_clientdata(client); 886 887 pm_runtime_get_sync(&client->dev); 888 pm_runtime_disable(&client->dev); 889 pm_runtime_set_suspended(&client->dev); 890 pm_runtime_put_noidle(&client->dev); 891 892 if (data->chip->set_power) 893 data->chip->set_power(data, false); 894 895 video_unregister_device(&data->vdev); 896 } 897 898 #ifdef CONFIG_PM 899 900 static int video_i2c_pm_runtime_suspend(struct device *dev) 901 { 902 struct video_i2c_data *data = i2c_get_clientdata(to_i2c_client(dev)); 903 904 if (!data->chip->set_power) 905 return 0; 906 907 return data->chip->set_power(data, false); 908 } 909 910 static int video_i2c_pm_runtime_resume(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, true); 918 } 919 920 #endif 921 922 static const struct dev_pm_ops video_i2c_pm_ops = { 923 SET_RUNTIME_PM_OPS(video_i2c_pm_runtime_suspend, 924 video_i2c_pm_runtime_resume, NULL) 925 }; 926 927 static const struct i2c_device_id video_i2c_id_table[] = { 928 { "amg88xx", (kernel_ulong_t)&video_i2c_chip[AMG88XX] }, 929 { "mlx90640", (kernel_ulong_t)&video_i2c_chip[MLX90640] }, 930 {} 931 }; 932 MODULE_DEVICE_TABLE(i2c, video_i2c_id_table); 933 934 static const struct of_device_id video_i2c_of_match[] = { 935 { .compatible = "panasonic,amg88xx", .data = &video_i2c_chip[AMG88XX] }, 936 { .compatible = "melexis,mlx90640", .data = &video_i2c_chip[MLX90640] }, 937 {} 938 }; 939 MODULE_DEVICE_TABLE(of, video_i2c_of_match); 940 941 static struct i2c_driver video_i2c_driver = { 942 .driver = { 943 .name = VIDEO_I2C_DRIVER, 944 .of_match_table = video_i2c_of_match, 945 .pm = &video_i2c_pm_ops, 946 }, 947 .probe = video_i2c_probe, 948 .remove = video_i2c_remove, 949 .id_table = video_i2c_id_table, 950 }; 951 952 module_i2c_driver(video_i2c_driver); 953 954 MODULE_AUTHOR("Matt Ranostay <matt.ranostay@konsulko.com>"); 955 MODULE_DESCRIPTION("I2C transport video support"); 956 MODULE_LICENSE("GPL v2"); 957