Hi Matt,
Thanks for the update. A few minor bits, please see below.
On Thu, Apr 05, 2018 at 10:14:49PM -0700, Matt Ranostay wrote:
> There are several thermal sensors that only have a low-speed bus
> interface but output valid video data. This patchset enables support
> for the AMG88xx "Grid-Eye" sensor family.
>
> Signed-off-by: Matt Ranostay <matt.ranostay@xxxxxxxxxxxx>
> ---
> MAINTAINERS | 6 +
> drivers/media/i2c/Kconfig | 13 +
> drivers/media/i2c/Makefile | 1 +
> drivers/media/i2c/video-i2c.c | 560 ++++++++++++++++++++++++++++++++++++++++++
> 4 files changed, 580 insertions(+)
> create mode 100644 drivers/media/i2c/video-i2c.c
>
> diff --git a/MAINTAINERS b/MAINTAINERS
> index dc153da22e8a..928b6a862626 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -14880,6 +14880,12 @@ L: linux-media@xxxxxxxxxxxxxxx
> S: Maintained
> F: drivers/media/platform/video-mux.c
>
> +VIDEO I2C POLLING DRIVER
> +M: Matt Ranostay <matt.ranostay@xxxxxxxxxxxx>
> +L: linux-media@xxxxxxxxxxxxxxx
> +S: Maintained
> +F: drivers/media/i2c/video-i2c.c
> +
> VIDEOBUF2 FRAMEWORK
> M: Pawel Osciak <pawel@xxxxxxxxxx>
> M: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
> diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig
> index 541f0d28afd8..faaaceb94832 100644
> --- a/drivers/media/i2c/Kconfig
> +++ b/drivers/media/i2c/Kconfig
> @@ -974,6 +974,19 @@ config VIDEO_M52790
>
> To compile this driver as a module, choose M here: the
> module will be called m52790.
> +
> +config VIDEO_I2C
> + tristate "I2C transport video support"
> + depends on VIDEO_V4L2 && I2C
> + select VIDEOBUF2_VMALLOC
> + ---help---
> + Enable the I2C transport video support which supports the
> + following:
> + * Panasonic AMG88xx Grid-Eye Sensors
> +
> + To compile this driver as a module, choose M here: the
> + module will be called video-i2c
> +
> endmenu
>
> menu "Sensors used on soc_camera driver"
> diff --git a/drivers/media/i2c/Makefile b/drivers/media/i2c/Makefile
> index ea34aee1a85a..84cc472238ef 100644
> --- a/drivers/media/i2c/Makefile
> +++ b/drivers/media/i2c/Makefile
> @@ -96,6 +96,7 @@ obj-$(CONFIG_VIDEO_LM3646) += lm3646.o
> obj-$(CONFIG_VIDEO_SMIAPP_PLL) += smiapp-pll.o
> obj-$(CONFIG_VIDEO_AK881X) += ak881x.o
> obj-$(CONFIG_VIDEO_IR_I2C) += ir-kbd-i2c.o
> +obj-$(CONFIG_VIDEO_I2C) += video-i2c.o
> obj-$(CONFIG_VIDEO_ML86V7667) += ml86v7667.o
> obj-$(CONFIG_VIDEO_OV2659) += ov2659.o
> obj-$(CONFIG_VIDEO_TC358743) += tc358743.o
> diff --git a/drivers/media/i2c/video-i2c.c b/drivers/media/i2c/video-i2c.c
> new file mode 100644
> index 000000000000..42427a724c00
> --- /dev/null
> +++ b/drivers/media/i2c/video-i2c.c
> @@ -0,0 +1,560 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * video-i2c.c - Support for I2C transport video devices
> + *
> + * Copyright (C) 2018 Matt Ranostay <matt.ranostay@xxxxxxxxxxxx>
> + *
> + * Supported:
> + * - Panasonic AMG88xx Grid-Eye Sensors
> + */
> +
> +#include <linux/delay.h>
> +#include <linux/freezer.h>
> +#include <linux/kthread.h>
> +#include <linux/i2c.h>
> +#include <linux/list.h>
> +#include <linux/module.h>
> +#include <linux/mutex.h>
> +#include <linux/of_device.h>
> +#include <linux/sched.h>
> +#include <linux/slab.h>
> +#include <linux/videodev2.h>
> +#include <media/v4l2-common.h>
> +#include <media/v4l2-device.h>
> +#include <media/v4l2-event.h>
> +#include <media/v4l2-fh.h>
> +#include <media/v4l2-ioctl.h>
> +#include <media/videobuf2-v4l2.h>
> +#include <media/videobuf2-vmalloc.h>
> +
> +#define VIDEO_I2C_DRIVER "video-i2c"
> +
> +struct video_i2c_chip;
> +
> +struct video_i2c_buffer {
> + struct vb2_v4l2_buffer vb;
> + struct list_head list;
> +};
> +
> +struct video_i2c_data {
> + struct i2c_client *client;
> + const struct video_i2c_chip *chip;
> + struct mutex lock;
> + spinlock_t slock;
> + unsigned int sequence;
> + struct mutex queue_lock;
> +
> + struct v4l2_device v4l2_dev;
> + struct video_device vdev;
> + struct vb2_queue vb_vidq;
> +
> + struct task_struct *kthread_vid_cap;
> + struct list_head vid_cap_active;
> +};
> +
> +static struct v4l2_fmtdesc amg88xx_format = {
const?
> + .pixelformat = V4L2_PIX_FMT_Y12,
> +};
> +
> +static struct v4l2_frmsize_discrete amg88xx_size = {
const?
> + .width = 8,
> + .height = 8,
> +};
> +
> +struct video_i2c_chip {
> + /* video dimensions */
> + const struct v4l2_fmtdesc *format;
> + const struct v4l2_frmsize_discrete *size;
> +
> + /* max frames per second */
> + unsigned int max_fps;
> +
> + /* pixel buffer size */
> + unsigned int buffer_size;
> +
> + /* pixel size in bits */
> + unsigned int bpp;
> +
> + /* xfer function */
> + int (*xfer)(struct video_i2c_data *data, char *buf);
> +};
> +
> +static int amg88xx_xfer(struct video_i2c_data *data, char *buf)
> +{
> + struct i2c_client *client = data->client;
> + struct i2c_msg msg[2];
> + u8 reg = 0x80;
> + int ret;
> +
> + msg[0].addr = client->addr;
> + msg[0].flags = 0;
> + msg[0].len = 1;
> + msg[0].buf = (char *)®
> +
> + msg[1].addr = client->addr;
> + msg[1].flags = I2C_M_RD;
> + msg[1].len = data->chip->buffer_size;
> + msg[1].buf = (char *)buf;
> +
> + ret = i2c_transfer(client->adapter, msg, 2);
> +
> + return (ret == 2) ? 0 : -EIO;
> +}
> +
> +#define AMG88XX 0
> +
> +static const struct video_i2c_chip video_i2c_chip[] = {
> + [AMG88XX] = {
> + .size = &amg88xx_size,
> + .format = &amg88xx_format,
> + .max_fps = 10,
> + .buffer_size = 128,
> + .bpp = 16,
> + .xfer = &amg88xx_xfer,
> + },
> +};
> +
> +static const struct v4l2_file_operations video_i2c_fops = {
> + .owner = THIS_MODULE,
> + .open = v4l2_fh_open,
> + .release = vb2_fop_release,
> + .poll = vb2_fop_poll,
> + .read = vb2_fop_read,
> + .mmap = vb2_fop_mmap,
> + .unlocked_ioctl = video_ioctl2,
> +};
> +
> +static int queue_setup(struct vb2_queue *vq,
> + unsigned int *nbuffers, unsigned int *nplanes,
> + unsigned int sizes[], struct device *alloc_devs[])
> +{
> + struct video_i2c_data *data = vb2_get_drv_priv(vq);
> + unsigned int size = data->chip->buffer_size;
> +
> + if (vq->num_buffers + *nbuffers < 2)
> + *nbuffers = 2;
> +
> + if (*nplanes)
> + return sizes[0] < size ? -EINVAL : 0;
> +
> + *nplanes = 1;
> + sizes[0] = size;
> +
> + return 0;
> +}
> +
> +static int buffer_prepare(struct vb2_buffer *vb)
> +{
> + struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
> + struct video_i2c_data *data = vb2_get_drv_priv(vb->vb2_queue);
> + unsigned int size = data->chip->buffer_size;
> +
> + if (vb2_plane_size(vb, 0) < size)
> + return -EINVAL;
> +
> + vbuf->field = V4L2_FIELD_NONE;
> + vb2_set_plane_payload(vb, 0, size);
> +
> + return 0;
> +}
> +
> +static void buffer_queue(struct vb2_buffer *vb)
> +{
> + struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
> + struct video_i2c_data *data = vb2_get_drv_priv(vb->vb2_queue);
> + struct video_i2c_buffer *buf =
> + container_of(vbuf, struct video_i2c_buffer, vb);
> +
> + spin_lock(&data->slock);
> + list_add_tail(&buf->list, &data->vid_cap_active);
> + spin_unlock(&data->slock);
> +}
> +
> +static int video_i2c_thread_vid_cap(void *priv)
> +{
> + struct video_i2c_data *data = priv;
> +
> + set_freezable();
> +
> + do {
> + unsigned long start_jiffies = jiffies;
> + unsigned int delay = msecs_to_jiffies(1000 / data->chip->max_fps);
> + struct video_i2c_buffer *vid_cap_buf = NULL;
> + int schedule_delay;
> +
> + try_to_freeze();
> +
> + spin_lock(&data->slock);
> +
> + if (!list_empty(&data->vid_cap_active)) {
> + vid_cap_buf = list_last_entry(&data->vid_cap_active,
> + struct video_i2c_buffer, list);
> + list_del(&vid_cap_buf->list);
> + }
> +
> + spin_unlock(&data->slock);
> +
> + if (vid_cap_buf) {
> + struct vb2_buffer *vb2_buf = &vid_cap_buf->vb.vb2_buf;
> + void *vbuf = vb2_plane_vaddr(vb2_buf, 0);
> + int ret = data->chip->xfer(data, vbuf);
> +
> + vb2_buf->timestamp = ktime_get_ns();
> + vid_cap_buf->vb.sequence = data->sequence++;
> + vb2_buffer_done(vb2_buf, ret ?
> + VB2_BUF_STATE_ERROR : VB2_BUF_STATE_DONE);
Over 80 characters per lines; please wrap. The same in assignment in delay
declaration above. As max_fps is constant for a given chip, you could just
declare it outside the loop.
> + }
> +
> + schedule_delay = delay - (jiffies - start_jiffies);
> +
> + if (time_after(jiffies, start_jiffies + delay))
> + schedule_delay = delay;
> +
> + schedule_timeout_interruptible(schedule_delay);
> + } while (!kthread_should_stop());
> +
> + return 0;
> +}
> +
> +static void video_i2c_del_list(struct vb2_queue *vq, enum vb2_buffer_state state)
> +{
> + struct video_i2c_data *data = vb2_get_drv_priv(vq);
> + struct video_i2c_buffer *buf, *tmp;
> +
> + spin_lock(&data->slock);
> +
> + list_for_each_entry_safe(buf, tmp, &data->vid_cap_active, list) {
> + list_del(&buf->list);
> + vb2_buffer_done(&buf->vb.vb2_buf, state);
> + }
> +
> + spin_unlock(&data->slock);
> +}
> +
> +static int start_streaming(struct vb2_queue *vq, unsigned int count)
> +{
> + struct video_i2c_data *data = vb2_get_drv_priv(vq);
> +
> + if (data->kthread_vid_cap)
> + return 0;
> +
> + data->sequence = 0;
> + data->kthread_vid_cap = kthread_run(video_i2c_thread_vid_cap, data,
> + "%s-vid-cap", data->v4l2_dev.name);
> + if (!IS_ERR(data->kthread_vid_cap))
> + return 0;
> +
> + video_i2c_del_list(vq, VB2_BUF_STATE_QUEUED);
> +
> + return PTR_ERR(data->kthread_vid_cap);
> +}
> +
> +static void stop_streaming(struct vb2_queue *vq)
> +{
> + struct video_i2c_data *data = vb2_get_drv_priv(vq);
> +
> + if (data->kthread_vid_cap == NULL)
> + return;
> +
> + kthread_stop(data->kthread_vid_cap);
> + data->kthread_vid_cap = NULL;
> +
> + video_i2c_del_list(vq, VB2_BUF_STATE_ERROR);
> +}
> +
> +static struct vb2_ops video_i2c_video_qops = {
> + .queue_setup = queue_setup,
> + .buf_prepare = buffer_prepare,
> + .buf_queue = buffer_queue,
> + .start_streaming = start_streaming,
> + .stop_streaming = stop_streaming,
> + .wait_prepare = vb2_ops_wait_prepare,
> + .wait_finish = vb2_ops_wait_finish,
> +};
> +
> +static int video_i2c_querycap(struct file *file, void *priv,
> + struct v4l2_capability *vcap)
> +{
> + struct video_i2c_data *data = video_drvdata(file);
> + struct i2c_client *client = data->client;
> +
> + strlcpy(vcap->driver, data->v4l2_dev.name, sizeof(vcap->driver));
> + strlcpy(vcap->card, data->vdev.name, sizeof(vcap->card));
> +
> + sprintf(vcap->bus_info, "I2C:%d-%d", client->adapter->nr, client->addr);
Newline here.
> + return 0;
> +}
> +
> +static int video_i2c_g_input(struct file *file, void *fh, unsigned int *inp)
> +{
> + *inp = 0;
> +
> + return 0;
> +}
> +
> +static int video_i2c_s_input(struct file *file, void *fh, unsigned int inp)
> +{
> + return (inp > 0) ? -EINVAL : 0;
> +}
> +
> +static int video_i2c_enum_input(struct file *file, void *fh,
> + struct v4l2_input *vin)
> +{
> + if (vin->index > 0)
> + return -EINVAL;
> +
> + strlcpy(vin->name, "Camera", sizeof(vin->name));
> +
> + vin->type = V4L2_INPUT_TYPE_CAMERA;
> +
> + return 0;
> +}
> +
> +static int video_i2c_enum_fmt_vid_cap(struct file *file, void *fh,
> + struct v4l2_fmtdesc *fmt)
> +{
> + struct video_i2c_data *data = video_drvdata(file);
> + enum v4l2_buf_type type = fmt->type;
> +
> + if (fmt->index > 0)
> + return -EINVAL;
> +
> + *fmt = *data->chip->format;
> + fmt->type = type;
> +
> + return 0;
> +}
> +
> +static int video_i2c_enum_framesizes(struct file *file, void *fh,
> + struct v4l2_frmsizeenum *fsize)
> +{
> + const struct video_i2c_data *data = video_drvdata(file);
> + const struct v4l2_frmsize_discrete *size = data->chip->size;
> +
> + /* currently only one frame size is allowed */
> + if (fsize->index > 0)
> + return -EINVAL;
> +
> + if (fsize->pixel_format != data->chip->format->pixelformat)
> + return -EINVAL;
> +
> + fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
> + fsize->discrete.width = size->width;
> + fsize->discrete.height = size->height;
> +
> + return 0;
> +}
> +
> +static int video_i2c_enum_frameintervals(struct file *file, void *priv,
> + struct v4l2_frmivalenum *fe)
> +{
> + const struct video_i2c_data *data = video_drvdata(file);
> + const struct v4l2_frmsize_discrete *size = data->chip->size;
> +
> + if (fe->index > 0)
> + return -EINVAL;
> +
> + if (fe->width != size->width || fe->height != size->height)
> + return -EINVAL;
> +
> + fe->type = V4L2_FRMIVAL_TYPE_DISCRETE;
> + fe->discrete.numerator = 1;
> + fe->discrete.denominator = data->chip->max_fps;
> +
> + return 0;
> +}
> +
> +static int video_i2c_try_fmt_vid_cap(struct file *file, void *fh,
> + struct v4l2_format *fmt)
> +{
> + const struct video_i2c_data *data = video_drvdata(file);
> + const struct v4l2_frmsize_discrete *size = data->chip->size;
> + struct v4l2_pix_format *pix = &fmt->fmt.pix;
> + unsigned int bpp = data->chip->bpp / 8;
> +
> + pix->width = size->width;
> + pix->height = size->height;
> + pix->pixelformat = data->chip->format->pixelformat;
> + pix->field = V4L2_FIELD_NONE;
> + pix->bytesperline = pix->width * bpp;
> + pix->sizeimage = pix->bytesperline * pix->height;
> + pix->colorspace = V4L2_COLORSPACE_RAW;
> +
> + return 0;
> +}
> +
> +static int video_i2c_s_fmt_vid_cap(struct file *file, void *fh,
> + struct v4l2_format *fmt)
> +{
> + struct video_i2c_data *data = video_drvdata(file);
> +
> + if (vb2_is_busy(&data->vb_vidq))
> + return -EBUSY;
> +
> + return video_i2c_try_fmt_vid_cap(file, fh, fmt);
> +}
> +
> +static int video_i2c_g_parm(struct file *filp, void *priv,
> + struct v4l2_streamparm *parm)
> +{
> + struct video_i2c_data *data = video_drvdata(filp);
> +
> + if (parm->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
> + return -EINVAL;
> +
> + parm->parm.capture.readbuffers = 1;
> + parm->parm.capture.capability = V4L2_CAP_TIMEPERFRAME;
> + parm->parm.capture.timeperframe.numerator = 1;
> + parm->parm.capture.timeperframe.denominator = data->chip->max_fps;
> +
> + return 0;
> +}
> +
> +static const struct v4l2_ioctl_ops video_i2c_ioctl_ops = {
> + .vidioc_querycap = video_i2c_querycap,
> + .vidioc_g_input = video_i2c_g_input,
> + .vidioc_s_input = video_i2c_s_input,
> + .vidioc_enum_input = video_i2c_enum_input,
> + .vidioc_enum_fmt_vid_cap = video_i2c_enum_fmt_vid_cap,
> + .vidioc_enum_framesizes = video_i2c_enum_framesizes,
> + .vidioc_enum_frameintervals = video_i2c_enum_frameintervals,
> + .vidioc_g_fmt_vid_cap = video_i2c_try_fmt_vid_cap,
> + .vidioc_s_fmt_vid_cap = video_i2c_s_fmt_vid_cap,
> + .vidioc_g_parm = video_i2c_g_parm,
> + .vidioc_s_parm = video_i2c_g_parm,
> + .vidioc_try_fmt_vid_cap = video_i2c_try_fmt_vid_cap,
> + .vidioc_reqbufs = vb2_ioctl_reqbufs,
> + .vidioc_create_bufs = vb2_ioctl_create_bufs,
> + .vidioc_prepare_buf = vb2_ioctl_prepare_buf,
> + .vidioc_querybuf = vb2_ioctl_querybuf,
> + .vidioc_qbuf = vb2_ioctl_qbuf,
> + .vidioc_dqbuf = vb2_ioctl_dqbuf,
> + .vidioc_streamon = vb2_ioctl_streamon,
> + .vidioc_streamoff = vb2_ioctl_streamoff,
> +};
> +
> +static void video_i2c_release(struct video_device *vdev)
> +{
> + kfree(video_get_drvdata(vdev));
> +}
> +
> +static int video_i2c_probe(struct i2c_client *client,
> + const struct i2c_device_id *id)
> +{
> + struct video_i2c_data *data;
> + struct v4l2_device *v4l2_dev;
> + struct vb2_queue *queue;
> + int ret;
> +
> + data = kzalloc(sizeof(*data), GFP_KERNEL);
> + if (!data)
> + return -ENOMEM;
> +
> + if (client->dev.of_node)
If you want to check here (indeed it probably makes sense), then please use
dev_fwnode(&client->dev) instead. With this change, you get ACPI support
effectively for free.
> + data->chip = device_get_match_data(&client->dev);
> + else
> + data->chip = &video_i2c_chip[id->driver_data];
id is NULL if no matching chip ID was found. Could you add a check for it?
> +
> + data->client = client;
> + v4l2_dev = &data->v4l2_dev;
> + strlcpy(v4l2_dev->name, VIDEO_I2C_DRIVER, sizeof(v4l2_dev->name));
> +
> + ret = v4l2_device_register(&client->dev, v4l2_dev);
> + if (ret < 0)
> + goto error_free_device;
> +
> + mutex_init(&data->lock);
> + mutex_init(&data->queue_lock);
> +
> + queue = &data->vb_vidq;
> + queue->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
> + queue->io_modes = VB2_DMABUF | VB2_MMAP | VB2_USERPTR | VB2_READ;
> + queue->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
> + queue->drv_priv = data;
> + queue->buf_struct_size = sizeof(struct video_i2c_buffer);
> + queue->min_buffers_needed = 1;
> + queue->ops = &video_i2c_video_qops;
> + queue->mem_ops = &vb2_vmalloc_memops;
> +
> + ret = vb2_queue_init(queue);
> + if (ret < 0)
> + goto error_unregister_device;
> +
> + data->vdev.queue = queue;
> + data->vdev.queue->lock = &data->queue_lock;
> +
> + snprintf(data->vdev.name, sizeof(data->vdev.name),
> + "I2C %d-%d Transport Video",
> + client->adapter->nr, client->addr);
> +
> + data->vdev.v4l2_dev = v4l2_dev;
> + data->vdev.fops = &video_i2c_fops;
> + data->vdev.lock = &data->lock;
> + data->vdev.ioctl_ops = &video_i2c_ioctl_ops;
> + data->vdev.release = video_i2c_release;
> + data->vdev.device_caps = V4L2_CAP_VIDEO_CAPTURE |
> + V4L2_CAP_READWRITE | V4L2_CAP_STREAMING;
> +
> + spin_lock_init(&data->slock);
> + INIT_LIST_HEAD(&data->vid_cap_active);
> +
> + video_set_drvdata(&data->vdev, data);
> + i2c_set_clientdata(client, data);
> +
> + ret = video_register_device(&data->vdev, VFL_TYPE_GRABBER, -1);
> + if (ret < 0)
> + goto error_unregister_device;
> +
> + return 0;
> +
> +error_unregister_device:
> + v4l2_device_unregister(v4l2_dev);
> + mutex_destroy(&data->lock);
> + mutex_destroy(&data->queue_lock);
> +
> +error_free_device:
> + kfree(data);
> +
> + return ret;
> +}
> +
> +static int video_i2c_remove(struct i2c_client *client)
> +{
> + struct video_i2c_data *data = i2c_get_clientdata(client);
> +
> + video_unregister_device(&data->vdev);
> + v4l2_device_unregister(&data->v4l2_dev);
> +
> + mutex_destroy(&data->lock);
> + mutex_destroy(&data->queue_lock);
> +
> + return 0;
> +}
> +
> +static const struct i2c_device_id video_i2c_id_table[] = {
> + { "amg88xx", AMG88XX },
> + {}
> +};
> +MODULE_DEVICE_TABLE(i2c, video_i2c_id_table);
> +
> +static const struct of_device_id video_i2c_of_match[] = {
> + { .compatible = "panasonic,amg88xx", .data = &video_i2c_chip[AMG88XX] },
> + {}
> +};
> +MODULE_DEVICE_TABLE(of, video_i2c_of_match);
> +
> +static struct i2c_driver video_i2c_driver = {
> + .driver = {
> + .name = VIDEO_I2C_DRIVER,
> + .of_match_table = video_i2c_of_match,
> + },
> + .probe = video_i2c_probe,
> + .remove = video_i2c_remove,
> + .id_table = video_i2c_id_table,
> +};
> +
> +module_i2c_driver(video_i2c_driver);
> +
> +MODULE_AUTHOR("Matt Ranostay <matt.ranostay@xxxxxxxxxxxx>");
> +MODULE_DESCRIPTION("I2C transport video support");
> +MODULE_LICENSE("GPL v2");
--
Kind regards,
Sakari Ailus
e-mail: sakari.ailus@xxxxxx
