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(map: data->regmap, MLX90640_EEPROM_START_ADDR + offset, val, val_count: 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(map: data->regmap, AMG88XX_REG_T01L, val: buf,
173 val_count: data->chip->buffer_size);
174}
175
176static int mlx90640_xfer(struct video_i2c_data *data, char *buf)
177{
178 return regmap_bulk_read(map: data->regmap, MLX90640_RAM_START_ADDR, val: buf,
179 val_count: 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(map: 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(map: data->regmap, MLX90640_REG_CTL1,
208 MLX90640_REG_CTL1_MASK,
209 val: 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(map: data->regmap, AMG88XX_REG_PCTL, AMG88XX_PCTL_NORMAL);
217 if (ret)
218 return ret;
219
220 msleep(msecs: 50);
221
222 ret = regmap_write(map: data->regmap, AMG88XX_REG_RST, AMG88XX_RST_INIT);
223 if (ret)
224 return ret;
225
226 usleep_range(min: 2000, max: 3000);
227
228 ret = regmap_write(map: 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(msecs: 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(map: 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(msecs: 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(dev: regmap_get_device(map: data->regmap));
297 if (tmp < 0)
298 return tmp;
299
300 tmp = regmap_bulk_read(map: data->regmap, AMG88XX_REG_TTHL, val: &buf, val_count: 2);
301 pm_runtime_mark_last_busy(dev: regmap_get_device(map: data->regmap));
302 pm_runtime_put_autosuspend(dev: regmap_get_device(map: 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(map: data->regmap);
334 void *hwmon = devm_hwmon_device_register_with_info(dev, name: "amg88xx", drvdata: data,
335 info: &amg88xx_chip_info, NULL);
336
337 return PTR_ERR_OR_ZERO(ptr: 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(q: vq);
407 unsigned int size = data->chip->buffer_size;
408 unsigned int q_num_bufs = vb2_get_num_buffers(q: 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
422static 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(q: vb->vb2_queue);
426 unsigned int size = data->chip->buffer_size;
427
428 if (vb2_plane_size(vb, plane_no: 0) < size)
429 return -EINVAL;
430
431 vbuf->field = V4L2_FIELD_NONE;
432 vb2_set_plane_payload(vb, plane_no: 0, size);
433
434 return 0;
435}
436
437static 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(q: vb->vb2_queue);
441 struct video_i2c_buffer *buf =
442 container_of(vbuf, struct video_i2c_buffer, vb);
443
444 spin_lock(lock: &data->slock);
445 list_add_tail(new: &buf->list, head: &data->vid_cap_active);
446 spin_unlock(lock: &data->slock);
447}
448
449static 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(kt: 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(lock: &data->slock);
466
467 if (!list_empty(head: &data->vid_cap_active)) {
468 vid_cap_buf = list_last_entry(&data->vid_cap_active,
469 struct video_i2c_buffer, list);
470 list_del(entry: &vid_cap_buf->list);
471 }
472
473 spin_unlock(lock: &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(vb: vb2_buf, plane_no: 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(vb: vb2_buf, state: ret ?
484 VB2_BUF_STATE_ERROR : VB2_BUF_STATE_DONE);
485 }
486
487 end_us += delay;
488 current_us = ktime_to_us(kt: ktime_get());
489 if (current_us < end_us) {
490 schedule_delay = end_us - current_us;
491 usleep_range(min: schedule_delay * 3 / 4, max: schedule_delay);
492 } else {
493 end_us = current_us;
494 }
495 } while (!kthread_should_stop());
496
497 return 0;
498}
499
500static 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(q: vq);
503 struct video_i2c_buffer *buf, *tmp;
504
505 spin_lock(lock: &data->slock);
506
507 list_for_each_entry_safe(buf, tmp, &data->vid_cap_active, list) {
508 list_del(entry: &buf->list);
509 vb2_buffer_done(vb: &buf->vb.vb2_buf, state);
510 }
511
512 spin_unlock(lock: &data->slock);
513}
514
515static int start_streaming(struct vb2_queue *vq, unsigned int count)
516{
517 struct video_i2c_data *data = vb2_get_drv_priv(q: vq);
518 struct device *dev = regmap_get_device(map: 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(ptr: data->kthread_vid_cap);
536 if (!ret)
537 return 0;
538
539error_rpm_put:
540 pm_runtime_mark_last_busy(dev);
541 pm_runtime_put_autosuspend(dev);
542error_del_list:
543 video_i2c_del_list(vq, state: VB2_BUF_STATE_QUEUED);
544
545 return ret;
546}
547
548static void stop_streaming(struct vb2_queue *vq)
549{
550 struct video_i2c_data *data = vb2_get_drv_priv(q: vq);
551
552 if (data->kthread_vid_cap == NULL)
553 return;
554
555 kthread_stop(k: data->kthread_vid_cap);
556 data->kthread_vid_cap = NULL;
557 pm_runtime_mark_last_busy(dev: regmap_get_device(map: data->regmap));
558 pm_runtime_put_autosuspend(dev: regmap_get_device(map: data->regmap));
559
560 video_i2c_del_list(vq, state: VB2_BUF_STATE_ERROR);
561}
562
563static 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 .wait_prepare = vb2_ops_wait_prepare,
570 .wait_finish = vb2_ops_wait_finish,
571};
572
573static int video_i2c_querycap(struct file *file, void *priv,
574 struct v4l2_capability *vcap)
575{
576 struct video_i2c_data *data = video_drvdata(file);
577 struct device *dev = regmap_get_device(map: data->regmap);
578 struct i2c_client *client = to_i2c_client(dev);
579
580 strscpy(vcap->driver, data->v4l2_dev.name, sizeof(vcap->driver));
581 strscpy(vcap->card, data->vdev.name, sizeof(vcap->card));
582
583 sprintf(buf: vcap->bus_info, fmt: "I2C:%d-%d", client->adapter->nr, client->addr);
584
585 return 0;
586}
587
588static int video_i2c_g_input(struct file *file, void *fh, unsigned int *inp)
589{
590 *inp = 0;
591
592 return 0;
593}
594
595static int video_i2c_s_input(struct file *file, void *fh, unsigned int inp)
596{
597 return (inp > 0) ? -EINVAL : 0;
598}
599
600static int video_i2c_enum_input(struct file *file, void *fh,
601 struct v4l2_input *vin)
602{
603 if (vin->index > 0)
604 return -EINVAL;
605
606 strscpy(vin->name, "Camera", sizeof(vin->name));
607
608 vin->type = V4L2_INPUT_TYPE_CAMERA;
609
610 return 0;
611}
612
613static int video_i2c_enum_fmt_vid_cap(struct file *file, void *fh,
614 struct v4l2_fmtdesc *fmt)
615{
616 struct video_i2c_data *data = video_drvdata(file);
617 enum v4l2_buf_type type = fmt->type;
618
619 if (fmt->index > 0)
620 return -EINVAL;
621
622 *fmt = *data->chip->format;
623 fmt->type = type;
624
625 return 0;
626}
627
628static int video_i2c_enum_framesizes(struct file *file, void *fh,
629 struct v4l2_frmsizeenum *fsize)
630{
631 const struct video_i2c_data *data = video_drvdata(file);
632 const struct v4l2_frmsize_discrete *size = data->chip->size;
633
634 /* currently only one frame size is allowed */
635 if (fsize->index > 0)
636 return -EINVAL;
637
638 if (fsize->pixel_format != data->chip->format->pixelformat)
639 return -EINVAL;
640
641 fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
642 fsize->discrete.width = size->width;
643 fsize->discrete.height = size->height;
644
645 return 0;
646}
647
648static int video_i2c_enum_frameintervals(struct file *file, void *priv,
649 struct v4l2_frmivalenum *fe)
650{
651 const struct video_i2c_data *data = video_drvdata(file);
652 const struct v4l2_frmsize_discrete *size = data->chip->size;
653
654 if (fe->index >= data->chip->num_frame_intervals)
655 return -EINVAL;
656
657 if (fe->width != size->width || fe->height != size->height)
658 return -EINVAL;
659
660 fe->type = V4L2_FRMIVAL_TYPE_DISCRETE;
661 fe->discrete = data->chip->frame_intervals[fe->index];
662
663 return 0;
664}
665
666static int video_i2c_try_fmt_vid_cap(struct file *file, void *fh,
667 struct v4l2_format *fmt)
668{
669 const struct video_i2c_data *data = video_drvdata(file);
670 const struct v4l2_frmsize_discrete *size = data->chip->size;
671 struct v4l2_pix_format *pix = &fmt->fmt.pix;
672 unsigned int bpp = data->chip->bpp / 8;
673
674 pix->width = size->width;
675 pix->height = size->height;
676 pix->pixelformat = data->chip->format->pixelformat;
677 pix->field = V4L2_FIELD_NONE;
678 pix->bytesperline = pix->width * bpp;
679 pix->sizeimage = pix->bytesperline * pix->height;
680 pix->colorspace = V4L2_COLORSPACE_RAW;
681
682 return 0;
683}
684
685static int video_i2c_s_fmt_vid_cap(struct file *file, void *fh,
686 struct v4l2_format *fmt)
687{
688 struct video_i2c_data *data = video_drvdata(file);
689
690 if (vb2_is_busy(q: &data->vb_vidq))
691 return -EBUSY;
692
693 return video_i2c_try_fmt_vid_cap(file, fh, fmt);
694}
695
696static int video_i2c_g_parm(struct file *filp, void *priv,
697 struct v4l2_streamparm *parm)
698{
699 struct video_i2c_data *data = video_drvdata(file: filp);
700
701 if (parm->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
702 return -EINVAL;
703
704 parm->parm.capture.readbuffers = 1;
705 parm->parm.capture.capability = V4L2_CAP_TIMEPERFRAME;
706 parm->parm.capture.timeperframe = data->frame_interval;
707
708 return 0;
709}
710
711static int video_i2c_s_parm(struct file *filp, void *priv,
712 struct v4l2_streamparm *parm)
713{
714 struct video_i2c_data *data = video_drvdata(file: filp);
715 int i;
716
717 for (i = 0; i < data->chip->num_frame_intervals - 1; i++) {
718 if (V4L2_FRACT_COMPARE(parm->parm.capture.timeperframe, <=,
719 data->chip->frame_intervals[i]))
720 break;
721 }
722 data->frame_interval = data->chip->frame_intervals[i];
723
724 return video_i2c_g_parm(filp, priv, parm);
725}
726
727static const struct v4l2_ioctl_ops video_i2c_ioctl_ops = {
728 .vidioc_querycap = video_i2c_querycap,
729 .vidioc_g_input = video_i2c_g_input,
730 .vidioc_s_input = video_i2c_s_input,
731 .vidioc_enum_input = video_i2c_enum_input,
732 .vidioc_enum_fmt_vid_cap = video_i2c_enum_fmt_vid_cap,
733 .vidioc_enum_framesizes = video_i2c_enum_framesizes,
734 .vidioc_enum_frameintervals = video_i2c_enum_frameintervals,
735 .vidioc_g_fmt_vid_cap = video_i2c_try_fmt_vid_cap,
736 .vidioc_s_fmt_vid_cap = video_i2c_s_fmt_vid_cap,
737 .vidioc_g_parm = video_i2c_g_parm,
738 .vidioc_s_parm = video_i2c_s_parm,
739 .vidioc_try_fmt_vid_cap = video_i2c_try_fmt_vid_cap,
740 .vidioc_reqbufs = vb2_ioctl_reqbufs,
741 .vidioc_create_bufs = vb2_ioctl_create_bufs,
742 .vidioc_prepare_buf = vb2_ioctl_prepare_buf,
743 .vidioc_querybuf = vb2_ioctl_querybuf,
744 .vidioc_qbuf = vb2_ioctl_qbuf,
745 .vidioc_dqbuf = vb2_ioctl_dqbuf,
746 .vidioc_streamon = vb2_ioctl_streamon,
747 .vidioc_streamoff = vb2_ioctl_streamoff,
748};
749
750static void video_i2c_release(struct video_device *vdev)
751{
752 struct video_i2c_data *data = video_get_drvdata(vdev);
753
754 v4l2_device_unregister(v4l2_dev: &data->v4l2_dev);
755 mutex_destroy(lock: &data->lock);
756 mutex_destroy(lock: &data->queue_lock);
757 regmap_exit(map: data->regmap);
758 kfree(objp: data);
759}
760
761static int video_i2c_probe(struct i2c_client *client)
762{
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(size: sizeof(*data), GFP_KERNEL);
769 if (!data)
770 return -ENOMEM;
771
772 data->chip = i2c_get_match_data(client);
773 if (!data->chip)
774 goto error_free_device;
775
776 data->regmap = regmap_init_i2c(client, data->chip->regmap_config);
777 if (IS_ERR(ptr: data->regmap)) {
778 ret = PTR_ERR(ptr: data->regmap);
779 goto error_free_device;
780 }
781
782 v4l2_dev = &data->v4l2_dev;
783 strscpy(v4l2_dev->name, VIDEO_I2C_DRIVER, sizeof(v4l2_dev->name));
784
785 ret = v4l2_device_register(dev: &client->dev, v4l2_dev);
786 if (ret < 0)
787 goto error_regmap_exit;
788
789 mutex_init(&data->lock);
790 mutex_init(&data->queue_lock);
791
792 queue = &data->vb_vidq;
793 queue->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
794 queue->io_modes = VB2_DMABUF | VB2_MMAP | VB2_USERPTR | VB2_READ;
795 queue->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
796 queue->drv_priv = data;
797 queue->buf_struct_size = sizeof(struct video_i2c_buffer);
798 queue->min_queued_buffers = 1;
799 queue->ops = &video_i2c_video_qops;
800 queue->mem_ops = &vb2_vmalloc_memops;
801
802 ret = vb2_queue_init(q: queue);
803 if (ret < 0)
804 goto error_unregister_device;
805
806 data->vdev.queue = queue;
807 data->vdev.queue->lock = &data->queue_lock;
808
809 snprintf(buf: data->vdev.name, size: sizeof(data->vdev.name),
810 fmt: "I2C %d-%d Transport Video",
811 client->adapter->nr, client->addr);
812
813 data->vdev.v4l2_dev = v4l2_dev;
814 data->vdev.fops = &video_i2c_fops;
815 data->vdev.lock = &data->lock;
816 data->vdev.ioctl_ops = &video_i2c_ioctl_ops;
817 data->vdev.release = video_i2c_release;
818 data->vdev.device_caps = V4L2_CAP_VIDEO_CAPTURE |
819 V4L2_CAP_READWRITE | V4L2_CAP_STREAMING;
820
821 spin_lock_init(&data->slock);
822 INIT_LIST_HEAD(list: &data->vid_cap_active);
823
824 data->frame_interval = data->chip->frame_intervals[0];
825
826 video_set_drvdata(vdev: &data->vdev, data);
827 i2c_set_clientdata(client, data);
828
829 if (data->chip->set_power) {
830 ret = data->chip->set_power(data, true);
831 if (ret)
832 goto error_unregister_device;
833 }
834
835 pm_runtime_get_noresume(dev: &client->dev);
836 pm_runtime_set_active(dev: &client->dev);
837 pm_runtime_enable(dev: &client->dev);
838 pm_runtime_set_autosuspend_delay(dev: &client->dev, delay: 2000);
839 pm_runtime_use_autosuspend(dev: &client->dev);
840
841 if (data->chip->hwmon_init) {
842 ret = data->chip->hwmon_init(data);
843 if (ret < 0) {
844 dev_warn(&client->dev,
845 "failed to register hwmon device\n");
846 }
847 }
848
849 if (data->chip->nvmem_config) {
850 struct nvmem_config *config = data->chip->nvmem_config;
851 struct nvmem_device *device;
852
853 config->priv = data;
854 config->dev = &client->dev;
855
856 device = devm_nvmem_register(dev: &client->dev, cfg: config);
857
858 if (IS_ERR(ptr: device)) {
859 dev_warn(&client->dev,
860 "failed to register nvmem device\n");
861 }
862 }
863
864 ret = video_register_device(vdev: &data->vdev, type: VFL_TYPE_VIDEO, nr: -1);
865 if (ret < 0)
866 goto error_pm_disable;
867
868 pm_runtime_mark_last_busy(dev: &client->dev);
869 pm_runtime_put_autosuspend(dev: &client->dev);
870
871 return 0;
872
873error_pm_disable:
874 pm_runtime_disable(dev: &client->dev);
875 pm_runtime_set_suspended(dev: &client->dev);
876 pm_runtime_put_noidle(dev: &client->dev);
877
878 if (data->chip->set_power)
879 data->chip->set_power(data, false);
880
881error_unregister_device:
882 v4l2_device_unregister(v4l2_dev);
883 mutex_destroy(lock: &data->lock);
884 mutex_destroy(lock: &data->queue_lock);
885
886error_regmap_exit:
887 regmap_exit(map: data->regmap);
888
889error_free_device:
890 kfree(objp: data);
891
892 return ret;
893}
894
895static void video_i2c_remove(struct i2c_client *client)
896{
897 struct video_i2c_data *data = i2c_get_clientdata(client);
898
899 pm_runtime_get_sync(dev: &client->dev);
900 pm_runtime_disable(dev: &client->dev);
901 pm_runtime_set_suspended(dev: &client->dev);
902 pm_runtime_put_noidle(dev: &client->dev);
903
904 if (data->chip->set_power)
905 data->chip->set_power(data, false);
906
907 video_unregister_device(vdev: &data->vdev);
908}
909
910#ifdef CONFIG_PM
911
912static int video_i2c_pm_runtime_suspend(struct device *dev)
913{
914 struct video_i2c_data *data = i2c_get_clientdata(to_i2c_client(dev));
915
916 if (!data->chip->set_power)
917 return 0;
918
919 return data->chip->set_power(data, false);
920}
921
922static int video_i2c_pm_runtime_resume(struct device *dev)
923{
924 struct video_i2c_data *data = i2c_get_clientdata(to_i2c_client(dev));
925
926 if (!data->chip->set_power)
927 return 0;
928
929 return data->chip->set_power(data, true);
930}
931
932#endif
933
934static const struct dev_pm_ops video_i2c_pm_ops = {
935 SET_RUNTIME_PM_OPS(video_i2c_pm_runtime_suspend,
936 video_i2c_pm_runtime_resume, NULL)
937};
938
939static const struct i2c_device_id video_i2c_id_table[] = {
940 { "amg88xx", (kernel_ulong_t)&video_i2c_chip[AMG88XX] },
941 { "mlx90640", (kernel_ulong_t)&video_i2c_chip[MLX90640] },
942 {}
943};
944MODULE_DEVICE_TABLE(i2c, video_i2c_id_table);
945
946static const struct of_device_id video_i2c_of_match[] = {
947 { .compatible = "panasonic,amg88xx", .data = &video_i2c_chip[AMG88XX] },
948 { .compatible = "melexis,mlx90640", .data = &video_i2c_chip[MLX90640] },
949 {}
950};
951MODULE_DEVICE_TABLE(of, video_i2c_of_match);
952
953static struct i2c_driver video_i2c_driver = {
954 .driver = {
955 .name = VIDEO_I2C_DRIVER,
956 .of_match_table = video_i2c_of_match,
957 .pm = &video_i2c_pm_ops,
958 },
959 .probe = video_i2c_probe,
960 .remove = video_i2c_remove,
961 .id_table = video_i2c_id_table,
962};
963
964module_i2c_driver(video_i2c_driver);
965
966MODULE_AUTHOR("Matt Ranostay <matt.ranostay@konsulko.com>");
967MODULE_DESCRIPTION("I2C transport video support");
968MODULE_LICENSE("GPL v2");
969

source code of linux/drivers/media/i2c/video-i2c.c