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 69struct video_i2c_chip; 70 71struct video_i2c_buffer { 72 struct vb2_v4l2_buffer vb; 73 struct list_head list; 74}; 75 76struct 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 94static const struct v4l2_fmtdesc amg88xx_format = { 95 .pixelformat = V4L2_PIX_FMT_Y12, 96}; 97 98static const struct v4l2_frmsize_discrete amg88xx_size = { 99 .width = 8, 100 .height = 8, 101}; 102 103static const struct v4l2_fmtdesc mlx90640_format = { 104 .pixelformat = V4L2_PIX_FMT_Y16_BE, 105}; 106 107static 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 112static const struct regmap_config amg88xx_regmap_config = { 113 .reg_bits = 8, 114 .val_bits = 8, 115 .max_register = 0xff 116}; 117 118static const struct regmap_config mlx90640_regmap_config = { 119 .reg_bits = 16, 120 .val_bits = 16, 121}; 122 123struct 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 154static 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 162static 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 170static 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 176static 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 182static 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 195static 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 212static 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 240static 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 257static 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 267static const u32 amg88xx_temp_config[] = { 268 HWMON_T_INPUT, 269 0 270}; 271 272static const struct hwmon_channel_info amg88xx_temp = { 273 .type = hwmon_temp, 274 .config = amg88xx_temp_config, 275}; 276 277static const struct hwmon_channel_info * const amg88xx_info[] = { 278 &amg88xx_temp, 279 NULL 280}; 281 282static 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 289static 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 321static const struct hwmon_ops amg88xx_hwmon_ops = { 322 .is_visible = amg88xx_is_visible, 323 .read = amg88xx_read, 324}; 325 326static const struct hwmon_chip_info amg88xx_chip_info = { 327 .ops = &amg88xx_hwmon_ops, 328 .info = amg88xx_info, 329}; 330 331static 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 343enum { 344 AMG88XX, 345 MLX90640, 346}; 347 348static const struct v4l2_fract amg88xx_frame_intervals[] = { 349 { 1, 10 }, 350 { 1, 1 }, 351}; 352 353static 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 364static 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 392static 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 402static 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; 408 409 if (vq->num_buffers + *nbuffers < 2) 410 *nbuffers = 2; 411 412 if (*nplanes) 413 return sizes[0] < size ? -EINVAL : 0; 414 415 *nplanes = 1; 416 sizes[0] = size; 417 418 return 0; 419} 420 421static int buffer_prepare(struct vb2_buffer *vb) 422{ 423 struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb); 424 struct video_i2c_data *data = vb2_get_drv_priv(vb->vb2_queue); 425 unsigned int size = data->chip->buffer_size; 426 427 if (vb2_plane_size(vb, 0) < size) 428 return -EINVAL; 429 430 vbuf->field = V4L2_FIELD_NONE; 431 vb2_set_plane_payload(vb, 0, size); 432 433 return 0; 434} 435 436static void buffer_queue(struct vb2_buffer *vb) 437{ 438 struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb); 439 struct video_i2c_data *data = vb2_get_drv_priv(vb->vb2_queue); 440 struct video_i2c_buffer *buf = 441 container_of(vbuf, struct video_i2c_buffer, vb); 442 443 spin_lock(&data->slock); 444 list_add_tail(&buf->list, &data->vid_cap_active); 445 spin_unlock(&data->slock); 446} 447 448static int video_i2c_thread_vid_cap(void *priv) 449{ 450 struct video_i2c_data *data = priv; 451 u32 delay = mult_frac(1000000UL, data->frame_interval.numerator, 452 data->frame_interval.denominator); 453 s64 end_us = ktime_to_us(ktime_get()); 454 455 set_freezable(); 456 457 do { 458 struct video_i2c_buffer *vid_cap_buf = NULL; 459 s64 current_us; 460 int schedule_delay; 461 462 try_to_freeze(); 463 464 spin_lock(&data->slock); 465 466 if (!list_empty(&data->vid_cap_active)) { 467 vid_cap_buf = list_last_entry(&data->vid_cap_active, 468 struct video_i2c_buffer, list); 469 list_del(&vid_cap_buf->list); 470 } 471 472 spin_unlock(&data->slock); 473 474 if (vid_cap_buf) { 475 struct vb2_buffer *vb2_buf = &vid_cap_buf->vb.vb2_buf; 476 void *vbuf = vb2_plane_vaddr(vb2_buf, 0); 477 int ret; 478 479 ret = data->chip->xfer(data, vbuf); 480 vb2_buf->timestamp = ktime_get_ns(); 481 vid_cap_buf->vb.sequence = data->sequence++; 482 vb2_buffer_done(vb2_buf, ret ? 483 VB2_BUF_STATE_ERROR : VB2_BUF_STATE_DONE); 484 } 485 486 end_us += delay; 487 current_us = ktime_to_us(ktime_get()); 488 if (current_us < end_us) { 489 schedule_delay = end_us - current_us; 490 usleep_range(schedule_delay * 3 / 4, schedule_delay); 491 } else { 492 end_us = current_us; 493 } 494 } while (!kthread_should_stop()); 495 496 return 0; 497} 498 499static void video_i2c_del_list(struct vb2_queue *vq, enum vb2_buffer_state state) 500{ 501 struct video_i2c_data *data = vb2_get_drv_priv(vq); 502 struct video_i2c_buffer *buf, *tmp; 503 504 spin_lock(&data->slock); 505 506 list_for_each_entry_safe(buf, tmp, &data->vid_cap_active, list) { 507 list_del(&buf->list); 508 vb2_buffer_done(&buf->vb.vb2_buf, state); 509 } 510 511 spin_unlock(&data->slock); 512} 513 514static int start_streaming(struct vb2_queue *vq, unsigned int count) 515{ 516 struct video_i2c_data *data = vb2_get_drv_priv(vq); 517 struct device *dev = regmap_get_device(data->regmap); 518 int ret; 519 520 if (data->kthread_vid_cap) 521 return 0; 522 523 ret = pm_runtime_resume_and_get(dev); 524 if (ret < 0) 525 goto error_del_list; 526 527 ret = data->chip->setup(data); 528 if (ret) 529 goto error_rpm_put; 530 531 data->sequence = 0; 532 data->kthread_vid_cap = kthread_run(video_i2c_thread_vid_cap, data, 533 "%s-vid-cap", data->v4l2_dev.name); 534 ret = PTR_ERR_OR_ZERO(data->kthread_vid_cap); 535 if (!ret) 536 return 0; 537 538error_rpm_put: 539 pm_runtime_mark_last_busy(dev); 540 pm_runtime_put_autosuspend(dev); 541error_del_list: 542 video_i2c_del_list(vq, VB2_BUF_STATE_QUEUED); 543 544 return ret; 545} 546 547static void stop_streaming(struct vb2_queue *vq) 548{ 549 struct video_i2c_data *data = vb2_get_drv_priv(vq); 550 551 if (data->kthread_vid_cap == NULL) 552 return; 553 554 kthread_stop(data->kthread_vid_cap); 555 data->kthread_vid_cap = NULL; 556 pm_runtime_mark_last_busy(regmap_get_device(data->regmap)); 557 pm_runtime_put_autosuspend(regmap_get_device(data->regmap)); 558 559 video_i2c_del_list(vq, VB2_BUF_STATE_ERROR); 560} 561 562static const struct vb2_ops video_i2c_video_qops = { 563 .queue_setup = queue_setup, 564 .buf_prepare = buffer_prepare, 565 .buf_queue = buffer_queue, 566 .start_streaming = start_streaming, 567 .stop_streaming = stop_streaming, 568 .wait_prepare = vb2_ops_wait_prepare, 569 .wait_finish = vb2_ops_wait_finish, 570}; 571 572static int video_i2c_querycap(struct file *file, void *priv, 573 struct v4l2_capability *vcap) 574{ 575 struct video_i2c_data *data = video_drvdata(file); 576 struct device *dev = regmap_get_device(data->regmap); 577 struct i2c_client *client = to_i2c_client(dev); 578 579 strscpy(vcap->driver, data->v4l2_dev.name, sizeof(vcap->driver)); 580 strscpy(vcap->card, data->vdev.name, sizeof(vcap->card)); 581 582 sprintf(vcap->bus_info, "I2C:%d-%d", client->adapter->nr, client->addr); 583 584 return 0; 585} 586 587static int video_i2c_g_input(struct file *file, void *fh, unsigned int *inp) 588{ 589 *inp = 0; 590 591 return 0; 592} 593 594static int video_i2c_s_input(struct file *file, void *fh, unsigned int inp) 595{ 596 return (inp > 0) ? -EINVAL : 0; 597} 598 599static int video_i2c_enum_input(struct file *file, void *fh, 600 struct v4l2_input *vin) 601{ 602 if (vin->index > 0) 603 return -EINVAL; 604 605 strscpy(vin->name, "Camera", sizeof(vin->name)); 606 607 vin->type = V4L2_INPUT_TYPE_CAMERA; 608 609 return 0; 610} 611 612static int video_i2c_enum_fmt_vid_cap(struct file *file, void *fh, 613 struct v4l2_fmtdesc *fmt) 614{ 615 struct video_i2c_data *data = video_drvdata(file); 616 enum v4l2_buf_type type = fmt->type; 617 618 if (fmt->index > 0) 619 return -EINVAL; 620 621 *fmt = *data->chip->format; 622 fmt->type = type; 623 624 return 0; 625} 626 627static int video_i2c_enum_framesizes(struct file *file, void *fh, 628 struct v4l2_frmsizeenum *fsize) 629{ 630 const struct video_i2c_data *data = video_drvdata(file); 631 const struct v4l2_frmsize_discrete *size = data->chip->size; 632 633 /* currently only one frame size is allowed */ 634 if (fsize->index > 0) 635 return -EINVAL; 636 637 if (fsize->pixel_format != data->chip->format->pixelformat) 638 return -EINVAL; 639 640 fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE; 641 fsize->discrete.width = size->width; 642 fsize->discrete.height = size->height; 643 644 return 0; 645} 646 647static int video_i2c_enum_frameintervals(struct file *file, void *priv, 648 struct v4l2_frmivalenum *fe) 649{ 650 const struct video_i2c_data *data = video_drvdata(file); 651 const struct v4l2_frmsize_discrete *size = data->chip->size; 652 653 if (fe->index >= data->chip->num_frame_intervals) 654 return -EINVAL; 655 656 if (fe->width != size->width || fe->height != size->height) 657 return -EINVAL; 658 659 fe->type = V4L2_FRMIVAL_TYPE_DISCRETE; 660 fe->discrete = data->chip->frame_intervals[fe->index]; 661 662 return 0; 663} 664 665static int video_i2c_try_fmt_vid_cap(struct file *file, void *fh, 666 struct v4l2_format *fmt) 667{ 668 const struct video_i2c_data *data = video_drvdata(file); 669 const struct v4l2_frmsize_discrete *size = data->chip->size; 670 struct v4l2_pix_format *pix = &fmt->fmt.pix; 671 unsigned int bpp = data->chip->bpp / 8; 672 673 pix->width = size->width; 674 pix->height = size->height; 675 pix->pixelformat = data->chip->format->pixelformat; 676 pix->field = V4L2_FIELD_NONE; 677 pix->bytesperline = pix->width * bpp; 678 pix->sizeimage = pix->bytesperline * pix->height; 679 pix->colorspace = V4L2_COLORSPACE_RAW; 680 681 return 0; 682} 683 684static int video_i2c_s_fmt_vid_cap(struct file *file, void *fh, 685 struct v4l2_format *fmt) 686{ 687 struct video_i2c_data *data = video_drvdata(file); 688 689 if (vb2_is_busy(&data->vb_vidq)) 690 return -EBUSY; 691 692 return video_i2c_try_fmt_vid_cap(file, fh, fmt); 693} 694 695static int video_i2c_g_parm(struct file *filp, void *priv, 696 struct v4l2_streamparm *parm) 697{ 698 struct video_i2c_data *data = video_drvdata(filp); 699 700 if (parm->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) 701 return -EINVAL; 702 703 parm->parm.capture.readbuffers = 1; 704 parm->parm.capture.capability = V4L2_CAP_TIMEPERFRAME; 705 parm->parm.capture.timeperframe = data->frame_interval; 706 707 return 0; 708} 709 710static int video_i2c_s_parm(struct file *filp, void *priv, 711 struct v4l2_streamparm *parm) 712{ 713 struct video_i2c_data *data = video_drvdata(filp); 714 int i; 715 716 for (i = 0; i < data->chip->num_frame_intervals - 1; i++) { 717 if (V4L2_FRACT_COMPARE(parm->parm.capture.timeperframe, <=, 718 data->chip->frame_intervals[i])) 719 break; 720 } 721 data->frame_interval = data->chip->frame_intervals[i]; 722 723 return video_i2c_g_parm(filp, priv, parm); 724} 725 726static const struct v4l2_ioctl_ops video_i2c_ioctl_ops = { 727 .vidioc_querycap = video_i2c_querycap, 728 .vidioc_g_input = video_i2c_g_input, 729 .vidioc_s_input = video_i2c_s_input, 730 .vidioc_enum_input = video_i2c_enum_input, 731 .vidioc_enum_fmt_vid_cap = video_i2c_enum_fmt_vid_cap, 732 .vidioc_enum_framesizes = video_i2c_enum_framesizes, 733 .vidioc_enum_frameintervals = video_i2c_enum_frameintervals, 734 .vidioc_g_fmt_vid_cap = video_i2c_try_fmt_vid_cap, 735 .vidioc_s_fmt_vid_cap = video_i2c_s_fmt_vid_cap, 736 .vidioc_g_parm = video_i2c_g_parm, 737 .vidioc_s_parm = video_i2c_s_parm, 738 .vidioc_try_fmt_vid_cap = video_i2c_try_fmt_vid_cap, 739 .vidioc_reqbufs = vb2_ioctl_reqbufs, 740 .vidioc_create_bufs = vb2_ioctl_create_bufs, 741 .vidioc_prepare_buf = vb2_ioctl_prepare_buf, 742 .vidioc_querybuf = vb2_ioctl_querybuf, 743 .vidioc_qbuf = vb2_ioctl_qbuf, 744 .vidioc_dqbuf = vb2_ioctl_dqbuf, 745 .vidioc_streamon = vb2_ioctl_streamon, 746 .vidioc_streamoff = vb2_ioctl_streamoff, 747}; 748 749static void video_i2c_release(struct video_device *vdev) 750{ 751 struct video_i2c_data *data = video_get_drvdata(vdev); 752 753 v4l2_device_unregister(&data->v4l2_dev); 754 mutex_destroy(&data->lock); 755 mutex_destroy(&data->queue_lock); 756 regmap_exit(data->regmap); 757 kfree(data); 758} 759 760static int video_i2c_probe(struct i2c_client *client) 761{ 762 const struct i2c_device_id *id = i2c_client_get_device_id(client); 763 struct video_i2c_data *data; 764 struct v4l2_device *v4l2_dev; 765 struct vb2_queue *queue; 766 int ret = -ENODEV; 767 768 data = kzalloc(sizeof(*data), GFP_KERNEL); 769 if (!data) 770 return -ENOMEM; 771 772 if (dev_fwnode(&client->dev)) 773 data->chip = device_get_match_data(&client->dev); 774 else if (id) 775 data->chip = &video_i2c_chip[id->driver_data]; 776 else 777 goto error_free_device; 778 779 data->regmap = regmap_init_i2c(client, data->chip->regmap_config); 780 if (IS_ERR(data->regmap)) { 781 ret = PTR_ERR(data->regmap); 782 goto error_free_device; 783 } 784 785 v4l2_dev = &data->v4l2_dev; 786 strscpy(v4l2_dev->name, VIDEO_I2C_DRIVER, sizeof(v4l2_dev->name)); 787 788 ret = v4l2_device_register(&client->dev, v4l2_dev); 789 if (ret < 0) 790 goto error_regmap_exit; 791 792 mutex_init(&data->lock); 793 mutex_init(&data->queue_lock); 794 795 queue = &data->vb_vidq; 796 queue->type = V4L2_BUF_TYPE_VIDEO_CAPTURE; 797 queue->io_modes = VB2_DMABUF | VB2_MMAP | VB2_USERPTR | VB2_READ; 798 queue->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC; 799 queue->drv_priv = data; 800 queue->buf_struct_size = sizeof(struct video_i2c_buffer); 801 queue->min_buffers_needed = 1; 802 queue->ops = &video_i2c_video_qops; 803 queue->mem_ops = &vb2_vmalloc_memops; 804 805 ret = vb2_queue_init(queue); 806 if (ret < 0) 807 goto error_unregister_device; 808 809 data->vdev.queue = queue; 810 data->vdev.queue->lock = &data->queue_lock; 811 812 snprintf(data->vdev.name, sizeof(data->vdev.name), 813 "I2C %d-%d Transport Video", 814 client->adapter->nr, client->addr); 815 816 data->vdev.v4l2_dev = v4l2_dev; 817 data->vdev.fops = &video_i2c_fops; 818 data->vdev.lock = &data->lock; 819 data->vdev.ioctl_ops = &video_i2c_ioctl_ops; 820 data->vdev.release = video_i2c_release; 821 data->vdev.device_caps = V4L2_CAP_VIDEO_CAPTURE | 822 V4L2_CAP_READWRITE | V4L2_CAP_STREAMING; 823 824 spin_lock_init(&data->slock); 825 INIT_LIST_HEAD(&data->vid_cap_active); 826 827 data->frame_interval = data->chip->frame_intervals[0]; 828 829 video_set_drvdata(&data->vdev, data); 830 i2c_set_clientdata(client, data); 831 832 if (data->chip->set_power) { 833 ret = data->chip->set_power(data, true); 834 if (ret) 835 goto error_unregister_device; 836 } 837 838 pm_runtime_get_noresume(&client->dev); 839 pm_runtime_set_active(&client->dev); 840 pm_runtime_enable(&client->dev); 841 pm_runtime_set_autosuspend_delay(&client->dev, 2000); 842 pm_runtime_use_autosuspend(&client->dev); 843 844 if (data->chip->hwmon_init) { 845 ret = data->chip->hwmon_init(data); 846 if (ret < 0) { 847 dev_warn(&client->dev, 848 "failed to register hwmon device\n"); 849 } 850 } 851 852 if (data->chip->nvmem_config) { 853 struct nvmem_config *config = data->chip->nvmem_config; 854 struct nvmem_device *device; 855 856 config->priv = data; 857 config->dev = &client->dev; 858 859 device = devm_nvmem_register(&client->dev, config); 860 861 if (IS_ERR(device)) { 862 dev_warn(&client->dev, 863 "failed to register nvmem device\n"); 864 } 865 } 866 867 ret = video_register_device(&data->vdev, VFL_TYPE_VIDEO, -1); 868 if (ret < 0) 869 goto error_pm_disable; 870 871 pm_runtime_mark_last_busy(&client->dev); 872 pm_runtime_put_autosuspend(&client->dev); 873 874 return 0; 875 876error_pm_disable: 877 pm_runtime_disable(&client->dev); 878 pm_runtime_set_suspended(&client->dev); 879 pm_runtime_put_noidle(&client->dev); 880 881 if (data->chip->set_power) 882 data->chip->set_power(data, false); 883 884error_unregister_device: 885 v4l2_device_unregister(v4l2_dev); 886 mutex_destroy(&data->lock); 887 mutex_destroy(&data->queue_lock); 888 889error_regmap_exit: 890 regmap_exit(data->regmap); 891 892error_free_device: 893 kfree(data); 894 895 return ret; 896} 897 898static void video_i2c_remove(struct i2c_client *client) 899{ 900 struct video_i2c_data *data = i2c_get_clientdata(client); 901 902 pm_runtime_get_sync(&client->dev); 903 pm_runtime_disable(&client->dev); 904 pm_runtime_set_suspended(&client->dev); 905 pm_runtime_put_noidle(&client->dev); 906 907 if (data->chip->set_power) 908 data->chip->set_power(data, false); 909 910 video_unregister_device(&data->vdev); 911} 912 913#ifdef CONFIG_PM 914 915static int video_i2c_pm_runtime_suspend(struct device *dev) 916{ 917 struct video_i2c_data *data = i2c_get_clientdata(to_i2c_client(dev)); 918 919 if (!data->chip->set_power) 920 return 0; 921 922 return data->chip->set_power(data, false); 923} 924 925static int video_i2c_pm_runtime_resume(struct device *dev) 926{ 927 struct video_i2c_data *data = i2c_get_clientdata(to_i2c_client(dev)); 928 929 if (!data->chip->set_power) 930 return 0; 931 932 return data->chip->set_power(data, true); 933} 934 935#endif 936 937static const struct dev_pm_ops video_i2c_pm_ops = { 938 SET_RUNTIME_PM_OPS(video_i2c_pm_runtime_suspend, 939 video_i2c_pm_runtime_resume, NULL) 940}; 941 942static const struct i2c_device_id video_i2c_id_table[] = { 943 { "amg88xx", AMG88XX }, 944 { "mlx90640", MLX90640 }, 945 {} 946}; 947MODULE_DEVICE_TABLE(i2c, video_i2c_id_table); 948 949static const struct of_device_id video_i2c_of_match[] = { 950 { .compatible = "panasonic,amg88xx", .data = &video_i2c_chip[AMG88XX] }, 951 { .compatible = "melexis,mlx90640", .data = &video_i2c_chip[MLX90640] }, 952 {} 953}; 954MODULE_DEVICE_TABLE(of, video_i2c_of_match); 955 956static struct i2c_driver video_i2c_driver = { 957 .driver = { 958 .name = VIDEO_I2C_DRIVER, 959 .of_match_table = video_i2c_of_match, 960 .pm = &video_i2c_pm_ops, 961 }, 962 .probe = video_i2c_probe, 963 .remove = video_i2c_remove, 964 .id_table = video_i2c_id_table, 965}; 966 967module_i2c_driver(video_i2c_driver); 968 969MODULE_AUTHOR("Matt Ranostay <matt.ranostay@konsulko.com>"); 970MODULE_DESCRIPTION("I2C transport video support"); 971MODULE_LICENSE("GPL v2"); 972