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.
Cc: Luca Barbato <lu_z...@gentoo.org>
Cc: Laurent Pinchart <laurent.pinch...@ideasonboard.com>
Signed-off-by: Matt Ranostay <matt.ranos...@konsulko.com>
---
MAINTAINERS | 6 +
drivers/media/i2c/Kconfig | 9 +
drivers/media/i2c/Makefile | 1 +
drivers/media/i2c/video-i2c.c | 558 ++++++++++++++++++++++++++++++++++++++++++
4 files changed, 574 insertions(+)
create mode 100644 drivers/media/i2c/video-i2c.c
diff --git a/MAINTAINERS b/MAINTAINERS
index 8c2320e1685c..90ae81ae0e09 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -14776,6 +14776,12 @@ L: linux-media@vger.kernel.org
S: Maintained
F: drivers/media/platform/video-mux.c
+VIDEO I2C POLLING DRIVER
+M: Matt Ranostay <matt.ranos...@konsulko.com>
+L: linux-media@vger.kernel.org
+S: Maintained
+F: drivers/media/i2c/video-i2c.c
+
VIDEOBUF2 FRAMEWORK
M: Pawel Osciak <pa...@osciak.com>
M: Marek Szyprowski <m.szyprow...@samsung.com>
diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig
index 8fdd673d449f..53aede720e0f 100644
--- a/drivers/media/i2c/Kconfig
+++ b/drivers/media/i2c/Kconfig
@@ -917,6 +917,15 @@ 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
endmenu
menu "Sensors used on soc_camera driver"
diff --git a/drivers/media/i2c/Makefile b/drivers/media/i2c/Makefile
index 26b19a2e9d04..5d4c06cb3f6f 100644
--- a/drivers/media/i2c/Makefile
+++ b/drivers/media/i2c/Makefile
@@ -91,6 +91,7 @@ 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..cd64fa80f55d
--- /dev/null
+++ b/drivers/media/i2c/video-i2c.c
@@ -0,0 +1,558 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * video-i2c.c - Support for I2C transport video devices
+ *
+ * Copyright (C) 2018 Matt Ranostay <matt.ranos...@konsulko.com>
+ *
+ * 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"
+#define MAX_BUFFER_SIZE 128
+
+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;
+ 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 = {
+ .pixelformat = V4L2_PIX_FMT_Y12,
+};
+
+static struct v4l2_frmsize_discrete amg88xx_size = {
+ .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 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;
+
+ 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_entry(data->vid_cap_active.next,
+ 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();
+ vb2_buffer_done(vb2_buf, ret ?
+ VB2_BUF_STATE_ERROR :
VB2_BUF_STATE_DONE);
+ }
+
+ 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 int start_streaming(struct vb2_queue *vq, unsigned int count)
+{
+ struct video_i2c_data *data = vb2_get_drv_priv(vq);
+ struct video_i2c_buffer *buf, *tmp;
+
+ if (data->kthread_vid_cap)
+ return 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;
+
+ 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,
+ VB2_BUF_STATE_QUEUED);
+ }
+
+ spin_unlock(&data->slock);
+
+ 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);
+
+ spin_lock(&data->slock);
+
+ while (!list_empty(&data->vid_cap_active)) {
+ struct video_i2c_buffer *buf;
+
+ buf = list_entry(data->vid_cap_active.next,
+ struct video_i2c_buffer, list);
+ list_del(&buf->list);
+ vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
+ }
+ spin_unlock(&data->slock);
+
+ data->kthread_vid_cap = NULL;
+}
+
+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));
+ sprintf(vcap->card, "I2C %d-%d Transport Video",
+ client->adapter->nr, client->addr);
+
+ sprintf(vcap->bus_info, "I2C:%d-%d", client->adapter->nr, client->addr);
+ 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->width * pix->height * bpp;
+ 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 chip_id, ret;
+
+ data = kzalloc(sizeof(*data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ if (client->dev.of_node)
+ chip_id = (int) of_device_get_match_data(&client->dev);
+ else
+ chip_id = id->driver_data;
+
+ data->chip = &video_i2c_chip[chip_id];
+ 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);
+
+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);
+
+ 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 = (void *) AMG88XX },
+ {}
+};
+MODULE_DEVICE_TABLE(of, video_i2c_of_match);
+
+static struct i2c_driver video_i2c_driver = {
+ .driver = {
+ .name = VIDEO_I2C_DRIVER,
+ .of_match_table = of_match_ptr(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.ranos...@konsulko.com>");
+MODULE_DESCRIPTION("I2C transport video support");
+MODULE_LICENSE("GPL");
--
2.14.1
