On 08/03/2016 10:08 AM, Songjun Wu wrote:
> Add driver for the Image Sensor Controller. It manages
> incoming data from a parallel based CMOS/CCD sensor.
> It has an internal image processor, also integrates a
> triple channel direct memory access controller master
> interface.
>
> Signed-off-by: Songjun Wu <songjun.wu@xxxxxxxxxxxxx>
> ---
>
> Changes in v8:
> - Power on the sensor on the first open in function
> 'isc_open'.
> - Power off the sensor on the last release in function
> 'isc_release'.
> - Remove the switch of the pipeline.
>
> Changes in v7:
> - Add enum_framesizes and enum_frameintervals.
> - Call s_stream(0) when stream start fail.
> - Fill the device_caps field of struct video_device
> with V4L2_CAP_STREAMING and V4L2_CAP_VIDEO_CAPTURE.
> - Initialize the dev of struct vb2_queue.
> - Set field to FIELD_NONE if the pix field is not supported.
> - Return the result directly when call g/s_parm of subdev.
>
> Changes in v6: None
> Changes in v5:
> - Modify the macro definition and the related code.
>
> Changes in v4:
> - Modify the isc clock code since the dt is changed.
>
> Changes in v3:
> - Add pm runtime feature.
> - Modify the isc clock code since the dt is changed.
>
> Changes in v2:
> - Add "depends on COMMON_CLK" and "VIDEO_V4L2_SUBDEV_API"
> in Kconfig file.
> - Correct typos and coding style according to Laurent's remarks
> - Delete the loop while in 'isc_clk_enable' function.
> - Replace 'hsync_active', 'vsync_active' and 'pclk_sample'
> with 'pfe_cfg0' in struct isc_subdev_entity.
> - Add the code to support VIDIOC_CREATE_BUFS in
> 'isc_queue_setup' function.
> - Invoke isc_config to configure register in
> 'isc_start_streaming' function.
> - Add the struct completion 'comp' to synchronize with
> the frame end interrupt in 'isc_stop_streaming' function.
> - Check the return value of the clk_prepare_enable
> in 'isc_open' function.
> - Set the default format in 'isc_open' function.
> - Add an exit condition in the loop while in 'isc_config'.
> - Delete the hardware setup operation in 'isc_set_format'.
> - Refuse format modification during streaming
> in 'isc_s_fmt_vid_cap' function.
> - Invoke v4l2_subdev_alloc_pad_config to allocate and
> initialize the pad config in 'isc_async_complete' function.
> - Remove the '.owner = THIS_MODULE,' in atmel_isc_driver.
> - Replace the module_platform_driver_probe() with
> module_platform_driver().
>
> drivers/media/platform/Kconfig | 1 +
> drivers/media/platform/Makefile | 2 +
> drivers/media/platform/atmel/Kconfig | 9 +
> drivers/media/platform/atmel/Makefile | 1 +
> drivers/media/platform/atmel/atmel-isc-regs.h | 165 +++
> drivers/media/platform/atmel/atmel-isc.c | 1503 +++++++++++++++++++++++++
> 6 files changed, 1681 insertions(+)
> create mode 100644 drivers/media/platform/atmel/Kconfig
> create mode 100644 drivers/media/platform/atmel/Makefile
> create mode 100644 drivers/media/platform/atmel/atmel-isc-regs.h
> create mode 100644 drivers/media/platform/atmel/atmel-isc.c
>
<snip>
> diff --git a/drivers/media/platform/atmel/atmel-isc.c b/drivers/media/platform/atmel/atmel-isc.c
> new file mode 100644
> index 0000000..d99d4a5
> --- /dev/null
> +++ b/drivers/media/platform/atmel/atmel-isc.c
<snip>
> +static int isc_set_default_fmt(struct isc_device *isc)
> +{
> + u32 index = isc->num_user_formats - 1;
Why pick the last format? Strictly speaking it doesn't matter, but in practice
the most common formats tend to be at the beginning of the format list.
> + struct v4l2_format f = {
> + .type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
> + .fmt.pix = {
> + .width = VGA_WIDTH,
> + .height = VGA_HEIGHT,
> + .field = V4L2_FIELD_NONE,
> + .pixelformat = isc->user_formats[index]->fourcc,
> + },
> + };
> +
> + return isc_set_fmt(isc, &f);
> +}
> +
> +static int isc_open(struct file *file)
> +{
> + struct isc_device *isc = video_drvdata(file);
> + struct v4l2_subdev *sd = isc->current_subdev->sd;
> + int ret;
> +
> + if (mutex_lock_interruptible(&isc->lock))
> + return -ERESTARTSYS;
> +
> + ret = v4l2_fh_open(file);
> + if (ret < 0)
> + goto unlock;
> +
> + if (!v4l2_fh_is_singular_file(file))
> + goto unlock;
> +
> + ret = v4l2_subdev_call(sd, core, s_power, 1);
> + if (ret < 0 && ret != -ENOIOCTLCMD)
> + goto unlock;
> +
> + ret = isc_set_default_fmt(isc);
This doesn't belong here, this needs to be done in isc_async_complete().
Having the code here means that every time you open the device, the format
changes back to the default. That's not what you want.
> + if (ret)
> + goto unlock;
> +
> +unlock:
> + mutex_unlock(&isc->lock);
> + return ret;
> +}
> +
<snip>
> +static int isc_async_complete(struct v4l2_async_notifier *notifier)
> +{
> + struct isc_device *isc = container_of(notifier->v4l2_dev,
> + struct isc_device, v4l2_dev);
> + struct isc_subdev_entity *sd_entity;
> + struct video_device *vdev = &isc->video_dev;
> + struct vb2_queue *q = &isc->vb2_vidq;
> + int ret;
> +
> + isc->current_subdev = container_of(notifier,
> + struct isc_subdev_entity, notifier);
> + sd_entity = isc->current_subdev;
> +
> + mutex_init(&isc->lock);
> + init_completion(&isc->comp);
> +
> + /* Initialize videobuf2 queue */
> + q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
> + q->io_modes = VB2_MMAP | VB2_DMABUF | VB2_READ;
> + q->drv_priv = isc;
> + q->buf_struct_size = sizeof(struct isc_buffer);
> + q->ops = &isc_vb2_ops;
> + q->mem_ops = &vb2_dma_contig_memops;
> + q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
> + q->lock = &isc->lock;
> + q->min_buffers_needed = 1;
> + q->dev = isc->dev;
> +
> + ret = vb2_queue_init(q);
> + if (ret < 0) {
> + v4l2_err(&isc->v4l2_dev,
> + "vb2_queue_init() failed: %d\n", ret);
> + return ret;
> + }
> +
> + /* Init video dma queues */
> + INIT_LIST_HEAD(&isc->dma_queue);
> + spin_lock_init(&isc->dma_queue_lock);
> +
> + /* Register video device */
> + strlcpy(vdev->name, ATMEL_ISC_NAME, sizeof(vdev->name));
> + vdev->release = video_device_release_empty;
> + vdev->fops = &isc_fops;
> + vdev->ioctl_ops = &isc_ioctl_ops;
> + vdev->v4l2_dev = &isc->v4l2_dev;
> + vdev->vfl_dir = VFL_DIR_RX;
> + vdev->queue = q;
> + vdev->lock = &isc->lock;
> + vdev->ctrl_handler = isc->current_subdev->sd->ctrl_handler;
> + vdev->device_caps = V4L2_CAP_STREAMING | V4L2_CAP_VIDEO_CAPTURE;
> + video_set_drvdata(vdev, isc);
> +
> + ret = video_register_device(vdev, VFL_TYPE_GRABBER, -1);
> + if (ret < 0) {
> + v4l2_err(&isc->v4l2_dev,
> + "video_register_device failed: %d\n", ret);
> + return ret;
> + }
This should be done last. Once the device is registered apps can use it, so
everything should be configured.
> +
> + sd_entity->config = v4l2_subdev_alloc_pad_config(sd_entity->sd);
> + if (sd_entity->config == NULL)
> + return -ENOMEM;
> +
> + ret = isc_formats_init(isc);
> + if (ret < 0) {
> + v4l2_err(&isc->v4l2_dev,
> + "Init format failed: %d\n", ret);
> + return ret;
> + }
> +
> + return 0;
> +}
Regards,
Hans
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