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_put_autosuspend(regmap_get_device(data->regmap)); 292 if (tmp) 293 return tmp; 294 295 tmp = le16_to_cpu(buf); 296 297 /* 298 * Check for sign bit, this isn't a two's complement value but an 299 * absolute temperature that needs to be inverted in the case of being 300 * negative. 301 */ 302 if (tmp & BIT(11)) 303 tmp = -(tmp & 0x7ff); 304 305 *val = (tmp * 625) / 10; 306 307 return 0; 308 } 309 310 static const struct hwmon_ops amg88xx_hwmon_ops = { 311 .is_visible = amg88xx_is_visible, 312 .read = amg88xx_read, 313 }; 314 315 static const struct hwmon_chip_info amg88xx_chip_info = { 316 .ops = &amg88xx_hwmon_ops, 317 .info = amg88xx_info, 318 }; 319 320 static int amg88xx_hwmon_init(struct video_i2c_data *data) 321 { 322 struct device *dev = regmap_get_device(data->regmap); 323 void *hwmon = devm_hwmon_device_register_with_info(dev, "amg88xx", data, 324 &amg88xx_chip_info, NULL); 325 326 return PTR_ERR_OR_ZERO(hwmon); 327 } 328 #else 329 #define amg88xx_hwmon_init NULL 330 #endif 331 332 enum { 333 AMG88XX, 334 MLX90640, 335 }; 336 337 static const struct v4l2_fract amg88xx_frame_intervals[] = { 338 { 1, 10 }, 339 { 1, 1 }, 340 }; 341 342 static const struct v4l2_fract mlx90640_frame_intervals[] = { 343 { 1, 64 }, 344 { 1, 32 }, 345 { 1, 16 }, 346 { 1, 8 }, 347 { 1, 4 }, 348 { 1, 2 }, 349 { 1, 1 }, 350 { 2, 1 }, 351 }; 352 353 static const struct video_i2c_chip video_i2c_chip[] = { 354 [AMG88XX] = { 355 .size = &amg88xx_size, 356 .format = &amg88xx_format, 357 .frame_intervals = amg88xx_frame_intervals, 358 .num_frame_intervals = ARRAY_SIZE(amg88xx_frame_intervals), 359 .buffer_size = 128, 360 .bpp = 16, 361 .regmap_config = &amg88xx_regmap_config, 362 .setup = &amg88xx_setup, 363 .xfer = &amg88xx_xfer, 364 .set_power = amg88xx_set_power, 365 .hwmon_init = amg88xx_hwmon_init, 366 }, 367 [MLX90640] = { 368 .size = &mlx90640_size, 369 .format = &mlx90640_format, 370 .frame_intervals = mlx90640_frame_intervals, 371 .num_frame_intervals = ARRAY_SIZE(mlx90640_frame_intervals), 372 .buffer_size = 1664, 373 .bpp = 16, 374 .regmap_config = &mlx90640_regmap_config, 375 .nvmem_config = &mlx90640_nvram_config, 376 .setup = mlx90640_setup, 377 .xfer = mlx90640_xfer, 378 }, 379 }; 380 381 static const struct v4l2_file_operations video_i2c_fops = { 382 .owner = THIS_MODULE, 383 .open = v4l2_fh_open, 384 .release = vb2_fop_release, 385 .poll = vb2_fop_poll, 386 .read = vb2_fop_read, 387 .mmap = vb2_fop_mmap, 388 .unlocked_ioctl = video_ioctl2, 389 }; 390 391 static int queue_setup(struct vb2_queue *vq, 392 unsigned int *nbuffers, unsigned int *nplanes, 393 unsigned int sizes[], struct device *alloc_devs[]) 394 { 395 struct video_i2c_data *data = vb2_get_drv_priv(vq); 396 unsigned int size = data->chip->buffer_size; 397 unsigned int q_num_bufs = vb2_get_num_buffers(vq); 398 399 if (q_num_bufs + *nbuffers < 2) 400 *nbuffers = 2 - q_num_bufs; 401 402 if (*nplanes) 403 return sizes[0] < size ? -EINVAL : 0; 404 405 *nplanes = 1; 406 sizes[0] = size; 407 408 return 0; 409 } 410 411 static int buffer_prepare(struct vb2_buffer *vb) 412 { 413 struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb); 414 struct video_i2c_data *data = vb2_get_drv_priv(vb->vb2_queue); 415 unsigned int size = data->chip->buffer_size; 416 417 if (vb2_plane_size(vb, 0) < size) 418 return -EINVAL; 419 420 vbuf->field = V4L2_FIELD_NONE; 421 vb2_set_plane_payload(vb, 0, size); 422 423 return 0; 424 } 425 426 static void buffer_queue(struct vb2_buffer *vb) 427 { 428 struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb); 429 struct video_i2c_data *data = vb2_get_drv_priv(vb->vb2_queue); 430 struct video_i2c_buffer *buf = 431 container_of(vbuf, struct video_i2c_buffer, vb); 432 433 spin_lock(&data->slock); 434 list_add_tail(&buf->list, &data->vid_cap_active); 435 spin_unlock(&data->slock); 436 } 437 438 static int video_i2c_thread_vid_cap(void *priv) 439 { 440 struct video_i2c_data *data = priv; 441 u32 delay = mult_frac(1000000UL, data->frame_interval.numerator, 442 data->frame_interval.denominator); 443 s64 end_us = ktime_to_us(ktime_get()); 444 445 set_freezable(); 446 447 do { 448 struct video_i2c_buffer *vid_cap_buf = NULL; 449 s64 current_us; 450 int schedule_delay; 451 452 try_to_freeze(); 453 454 spin_lock(&data->slock); 455 456 if (!list_empty(&data->vid_cap_active)) { 457 vid_cap_buf = list_last_entry(&data->vid_cap_active, 458 struct video_i2c_buffer, list); 459 list_del(&vid_cap_buf->list); 460 } 461 462 spin_unlock(&data->slock); 463 464 if (vid_cap_buf) { 465 struct vb2_buffer *vb2_buf = &vid_cap_buf->vb.vb2_buf; 466 void *vbuf = vb2_plane_vaddr(vb2_buf, 0); 467 int ret; 468 469 ret = data->chip->xfer(data, vbuf); 470 vb2_buf->timestamp = ktime_get_ns(); 471 vid_cap_buf->vb.sequence = data->sequence++; 472 vb2_buffer_done(vb2_buf, ret ? 473 VB2_BUF_STATE_ERROR : VB2_BUF_STATE_DONE); 474 } 475 476 end_us += delay; 477 current_us = ktime_to_us(ktime_get()); 478 if (current_us < end_us) { 479 schedule_delay = end_us - current_us; 480 usleep_range(schedule_delay * 3 / 4, schedule_delay); 481 } else { 482 end_us = current_us; 483 } 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_put_autosuspend(dev); 530 error_del_list: 531 video_i2c_del_list(vq, VB2_BUF_STATE_QUEUED); 532 533 return ret; 534 } 535 536 static void stop_streaming(struct vb2_queue *vq) 537 { 538 struct video_i2c_data *data = vb2_get_drv_priv(vq); 539 540 if (data->kthread_vid_cap == NULL) 541 return; 542 543 kthread_stop(data->kthread_vid_cap); 544 data->kthread_vid_cap = NULL; 545 pm_runtime_put_autosuspend(regmap_get_device(data->regmap)); 546 547 video_i2c_del_list(vq, VB2_BUF_STATE_ERROR); 548 } 549 550 static const struct vb2_ops video_i2c_video_qops = { 551 .queue_setup = queue_setup, 552 .buf_prepare = buffer_prepare, 553 .buf_queue = buffer_queue, 554 .start_streaming = start_streaming, 555 .stop_streaming = stop_streaming, 556 }; 557 558 static int video_i2c_querycap(struct file *file, void *priv, 559 struct v4l2_capability *vcap) 560 { 561 struct video_i2c_data *data = video_drvdata(file); 562 struct device *dev = regmap_get_device(data->regmap); 563 struct i2c_client *client = to_i2c_client(dev); 564 565 strscpy(vcap->driver, data->v4l2_dev.name, sizeof(vcap->driver)); 566 strscpy(vcap->card, data->vdev.name, sizeof(vcap->card)); 567 568 sprintf(vcap->bus_info, "I2C:%d-%d", client->adapter->nr, client->addr); 569 570 return 0; 571 } 572 573 static int video_i2c_g_input(struct file *file, void *fh, unsigned int *inp) 574 { 575 *inp = 0; 576 577 return 0; 578 } 579 580 static int video_i2c_s_input(struct file *file, void *fh, unsigned int inp) 581 { 582 return (inp > 0) ? -EINVAL : 0; 583 } 584 585 static int video_i2c_enum_input(struct file *file, void *fh, 586 struct v4l2_input *vin) 587 { 588 if (vin->index > 0) 589 return -EINVAL; 590 591 strscpy(vin->name, "Camera", sizeof(vin->name)); 592 593 vin->type = V4L2_INPUT_TYPE_CAMERA; 594 595 return 0; 596 } 597 598 static int video_i2c_enum_fmt_vid_cap(struct file *file, void *fh, 599 struct v4l2_fmtdesc *fmt) 600 { 601 struct video_i2c_data *data = video_drvdata(file); 602 enum v4l2_buf_type type = fmt->type; 603 604 if (fmt->index > 0) 605 return -EINVAL; 606 607 *fmt = *data->chip->format; 608 fmt->type = type; 609 610 return 0; 611 } 612 613 static int video_i2c_enum_framesizes(struct file *file, void *fh, 614 struct v4l2_frmsizeenum *fsize) 615 { 616 const struct video_i2c_data *data = video_drvdata(file); 617 const struct v4l2_frmsize_discrete *size = data->chip->size; 618 619 /* currently only one frame size is allowed */ 620 if (fsize->index > 0) 621 return -EINVAL; 622 623 if (fsize->pixel_format != data->chip->format->pixelformat) 624 return -EINVAL; 625 626 fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE; 627 fsize->discrete.width = size->width; 628 fsize->discrete.height = size->height; 629 630 return 0; 631 } 632 633 static int video_i2c_enum_frameintervals(struct file *file, void *priv, 634 struct v4l2_frmivalenum *fe) 635 { 636 const struct video_i2c_data *data = video_drvdata(file); 637 const struct v4l2_frmsize_discrete *size = data->chip->size; 638 639 if (fe->index >= data->chip->num_frame_intervals) 640 return -EINVAL; 641 642 if (fe->width != size->width || fe->height != size->height) 643 return -EINVAL; 644 645 fe->type = V4L2_FRMIVAL_TYPE_DISCRETE; 646 fe->discrete = data->chip->frame_intervals[fe->index]; 647 648 return 0; 649 } 650 651 static int video_i2c_try_fmt_vid_cap(struct file *file, void *fh, 652 struct v4l2_format *fmt) 653 { 654 const struct video_i2c_data *data = video_drvdata(file); 655 const struct v4l2_frmsize_discrete *size = data->chip->size; 656 struct v4l2_pix_format *pix = &fmt->fmt.pix; 657 unsigned int bpp = data->chip->bpp / 8; 658 659 pix->width = size->width; 660 pix->height = size->height; 661 pix->pixelformat = data->chip->format->pixelformat; 662 pix->field = V4L2_FIELD_NONE; 663 pix->bytesperline = pix->width * bpp; 664 pix->sizeimage = pix->bytesperline * pix->height; 665 pix->colorspace = V4L2_COLORSPACE_RAW; 666 667 return 0; 668 } 669 670 static int video_i2c_s_fmt_vid_cap(struct file *file, void *fh, 671 struct v4l2_format *fmt) 672 { 673 struct video_i2c_data *data = video_drvdata(file); 674 675 if (vb2_is_busy(&data->vb_vidq)) 676 return -EBUSY; 677 678 return video_i2c_try_fmt_vid_cap(file, fh, fmt); 679 } 680 681 static int video_i2c_g_parm(struct file *filp, void *priv, 682 struct v4l2_streamparm *parm) 683 { 684 struct video_i2c_data *data = video_drvdata(filp); 685 686 if (parm->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) 687 return -EINVAL; 688 689 parm->parm.capture.readbuffers = 1; 690 parm->parm.capture.capability = V4L2_CAP_TIMEPERFRAME; 691 parm->parm.capture.timeperframe = data->frame_interval; 692 693 return 0; 694 } 695 696 static int video_i2c_s_parm(struct file *filp, void *priv, 697 struct v4l2_streamparm *parm) 698 { 699 struct video_i2c_data *data = video_drvdata(filp); 700 int i; 701 702 for (i = 0; i < data->chip->num_frame_intervals - 1; i++) { 703 if (V4L2_FRACT_COMPARE(parm->parm.capture.timeperframe, <=, 704 data->chip->frame_intervals[i])) 705 break; 706 } 707 data->frame_interval = data->chip->frame_intervals[i]; 708 709 return video_i2c_g_parm(filp, priv, parm); 710 } 711 712 static const struct v4l2_ioctl_ops video_i2c_ioctl_ops = { 713 .vidioc_querycap = video_i2c_querycap, 714 .vidioc_g_input = video_i2c_g_input, 715 .vidioc_s_input = video_i2c_s_input, 716 .vidioc_enum_input = video_i2c_enum_input, 717 .vidioc_enum_fmt_vid_cap = video_i2c_enum_fmt_vid_cap, 718 .vidioc_enum_framesizes = video_i2c_enum_framesizes, 719 .vidioc_enum_frameintervals = video_i2c_enum_frameintervals, 720 .vidioc_g_fmt_vid_cap = video_i2c_try_fmt_vid_cap, 721 .vidioc_s_fmt_vid_cap = video_i2c_s_fmt_vid_cap, 722 .vidioc_g_parm = video_i2c_g_parm, 723 .vidioc_s_parm = video_i2c_s_parm, 724 .vidioc_try_fmt_vid_cap = video_i2c_try_fmt_vid_cap, 725 .vidioc_reqbufs = vb2_ioctl_reqbufs, 726 .vidioc_create_bufs = vb2_ioctl_create_bufs, 727 .vidioc_prepare_buf = vb2_ioctl_prepare_buf, 728 .vidioc_querybuf = vb2_ioctl_querybuf, 729 .vidioc_qbuf = vb2_ioctl_qbuf, 730 .vidioc_dqbuf = vb2_ioctl_dqbuf, 731 .vidioc_streamon = vb2_ioctl_streamon, 732 .vidioc_streamoff = vb2_ioctl_streamoff, 733 }; 734 735 static void video_i2c_release(struct video_device *vdev) 736 { 737 struct video_i2c_data *data = video_get_drvdata(vdev); 738 739 v4l2_device_unregister(&data->v4l2_dev); 740 mutex_destroy(&data->lock); 741 mutex_destroy(&data->queue_lock); 742 regmap_exit(data->regmap); 743 kfree(data); 744 } 745 746 static int video_i2c_probe(struct i2c_client *client) 747 { 748 struct video_i2c_data *data; 749 struct v4l2_device *v4l2_dev; 750 struct vb2_queue *queue; 751 int ret = -ENODEV; 752 753 data = kzalloc(sizeof(*data), GFP_KERNEL); 754 if (!data) 755 return -ENOMEM; 756 757 data->chip = i2c_get_match_data(client); 758 if (!data->chip) 759 goto error_free_device; 760 761 data->regmap = regmap_init_i2c(client, data->chip->regmap_config); 762 if (IS_ERR(data->regmap)) { 763 ret = PTR_ERR(data->regmap); 764 goto error_free_device; 765 } 766 767 v4l2_dev = &data->v4l2_dev; 768 strscpy(v4l2_dev->name, VIDEO_I2C_DRIVER, sizeof(v4l2_dev->name)); 769 770 ret = v4l2_device_register(&client->dev, v4l2_dev); 771 if (ret < 0) 772 goto error_regmap_exit; 773 774 mutex_init(&data->lock); 775 mutex_init(&data->queue_lock); 776 777 queue = &data->vb_vidq; 778 queue->type = V4L2_BUF_TYPE_VIDEO_CAPTURE; 779 queue->io_modes = VB2_DMABUF | VB2_MMAP | VB2_USERPTR | VB2_READ; 780 queue->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC; 781 queue->drv_priv = data; 782 queue->buf_struct_size = sizeof(struct video_i2c_buffer); 783 queue->min_queued_buffers = 1; 784 queue->ops = &video_i2c_video_qops; 785 queue->mem_ops = &vb2_vmalloc_memops; 786 queue->lock = &data->queue_lock; 787 788 ret = vb2_queue_init(queue); 789 if (ret < 0) 790 goto error_unregister_device; 791 792 data->vdev.queue = queue; 793 794 snprintf(data->vdev.name, sizeof(data->vdev.name), 795 "I2C %d-%d Transport Video", 796 client->adapter->nr, client->addr); 797 798 data->vdev.v4l2_dev = v4l2_dev; 799 data->vdev.fops = &video_i2c_fops; 800 data->vdev.lock = &data->lock; 801 data->vdev.ioctl_ops = &video_i2c_ioctl_ops; 802 data->vdev.release = video_i2c_release; 803 data->vdev.device_caps = V4L2_CAP_VIDEO_CAPTURE | 804 V4L2_CAP_READWRITE | V4L2_CAP_STREAMING; 805 806 spin_lock_init(&data->slock); 807 INIT_LIST_HEAD(&data->vid_cap_active); 808 809 data->frame_interval = data->chip->frame_intervals[0]; 810 811 video_set_drvdata(&data->vdev, data); 812 i2c_set_clientdata(client, data); 813 814 if (data->chip->set_power) { 815 ret = data->chip->set_power(data, true); 816 if (ret) 817 goto error_unregister_device; 818 } 819 820 pm_runtime_get_noresume(&client->dev); 821 pm_runtime_set_active(&client->dev); 822 pm_runtime_enable(&client->dev); 823 pm_runtime_set_autosuspend_delay(&client->dev, 2000); 824 pm_runtime_use_autosuspend(&client->dev); 825 826 if (data->chip->hwmon_init) { 827 ret = data->chip->hwmon_init(data); 828 if (ret < 0) { 829 dev_warn(&client->dev, 830 "failed to register hwmon device\n"); 831 } 832 } 833 834 if (data->chip->nvmem_config) { 835 struct nvmem_config *config = data->chip->nvmem_config; 836 struct nvmem_device *device; 837 838 config->priv = data; 839 config->dev = &client->dev; 840 841 device = devm_nvmem_register(&client->dev, config); 842 843 if (IS_ERR(device)) { 844 dev_warn(&client->dev, 845 "failed to register nvmem device\n"); 846 } 847 } 848 849 ret = video_register_device(&data->vdev, VFL_TYPE_VIDEO, -1); 850 if (ret < 0) 851 goto error_pm_disable; 852 853 pm_runtime_put_autosuspend(&client->dev); 854 855 return 0; 856 857 error_pm_disable: 858 pm_runtime_disable(&client->dev); 859 pm_runtime_set_suspended(&client->dev); 860 pm_runtime_put_noidle(&client->dev); 861 862 if (data->chip->set_power) 863 data->chip->set_power(data, false); 864 865 error_unregister_device: 866 v4l2_device_unregister(v4l2_dev); 867 mutex_destroy(&data->lock); 868 mutex_destroy(&data->queue_lock); 869 870 error_regmap_exit: 871 regmap_exit(data->regmap); 872 873 error_free_device: 874 kfree(data); 875 876 return ret; 877 } 878 879 static void video_i2c_remove(struct i2c_client *client) 880 { 881 struct video_i2c_data *data = i2c_get_clientdata(client); 882 883 pm_runtime_get_sync(&client->dev); 884 pm_runtime_disable(&client->dev); 885 pm_runtime_set_suspended(&client->dev); 886 pm_runtime_put_noidle(&client->dev); 887 888 if (data->chip->set_power) 889 data->chip->set_power(data, false); 890 891 video_unregister_device(&data->vdev); 892 } 893 894 #ifdef CONFIG_PM 895 896 static int video_i2c_pm_runtime_suspend(struct device *dev) 897 { 898 struct video_i2c_data *data = i2c_get_clientdata(to_i2c_client(dev)); 899 900 if (!data->chip->set_power) 901 return 0; 902 903 return data->chip->set_power(data, false); 904 } 905 906 static int video_i2c_pm_runtime_resume(struct device *dev) 907 { 908 struct video_i2c_data *data = i2c_get_clientdata(to_i2c_client(dev)); 909 910 if (!data->chip->set_power) 911 return 0; 912 913 return data->chip->set_power(data, true); 914 } 915 916 #endif 917 918 static const struct dev_pm_ops video_i2c_pm_ops = { 919 SET_RUNTIME_PM_OPS(video_i2c_pm_runtime_suspend, 920 video_i2c_pm_runtime_resume, NULL) 921 }; 922 923 static const struct i2c_device_id video_i2c_id_table[] = { 924 { "amg88xx", (kernel_ulong_t)&video_i2c_chip[AMG88XX] }, 925 { "mlx90640", (kernel_ulong_t)&video_i2c_chip[MLX90640] }, 926 {} 927 }; 928 MODULE_DEVICE_TABLE(i2c, video_i2c_id_table); 929 930 static const struct of_device_id video_i2c_of_match[] = { 931 { .compatible = "panasonic,amg88xx", .data = &video_i2c_chip[AMG88XX] }, 932 { .compatible = "melexis,mlx90640", .data = &video_i2c_chip[MLX90640] }, 933 {} 934 }; 935 MODULE_DEVICE_TABLE(of, video_i2c_of_match); 936 937 static struct i2c_driver video_i2c_driver = { 938 .driver = { 939 .name = VIDEO_I2C_DRIVER, 940 .of_match_table = video_i2c_of_match, 941 .pm = &video_i2c_pm_ops, 942 }, 943 .probe = video_i2c_probe, 944 .remove = video_i2c_remove, 945 .id_table = video_i2c_id_table, 946 }; 947 948 module_i2c_driver(video_i2c_driver); 949 950 MODULE_AUTHOR("Matt Ranostay <matt.ranostay@konsulko.com>"); 951 MODULE_DESCRIPTION("I2C transport video support"); 952 MODULE_LICENSE("GPL v2"); 953