drivers/media/radio/radio-timb.c

Source file repositories/reference/linux-study-clean/drivers/media/radio/radio-timb.c

File Facts

System
Linux kernel
Corpus path
drivers/media/radio/radio-timb.c
Extension
.c
Size
4783 bytes
Lines
177
Domain
Driver Families
Bucket
drivers/media
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

struct timbradio {
	struct timb_radio_platform_data	pdata;
	struct v4l2_subdev	*sd_tuner;
	struct v4l2_subdev	*sd_dsp;
	struct video_device	video_dev;
	struct v4l2_device	v4l2_dev;
	struct mutex		lock;
};


static int timbradio_vidioc_querycap(struct file *file, void  *priv,
	struct v4l2_capability *v)
{
	strscpy(v->driver, DRIVER_NAME, sizeof(v->driver));
	strscpy(v->card, "Timberdale Radio", sizeof(v->card));
	snprintf(v->bus_info, sizeof(v->bus_info), "platform:"DRIVER_NAME);
	return 0;
}

static int timbradio_vidioc_g_tuner(struct file *file, void *priv,
	struct v4l2_tuner *v)
{
	struct timbradio *tr = video_drvdata(file);
	return v4l2_subdev_call(tr->sd_tuner, tuner, g_tuner, v);
}

static int timbradio_vidioc_s_tuner(struct file *file, void *priv,
	const struct v4l2_tuner *v)
{
	struct timbradio *tr = video_drvdata(file);
	return v4l2_subdev_call(tr->sd_tuner, tuner, s_tuner, v);
}

static int timbradio_vidioc_s_frequency(struct file *file, void *priv,
	const struct v4l2_frequency *f)
{
	struct timbradio *tr = video_drvdata(file);
	return v4l2_subdev_call(tr->sd_tuner, tuner, s_frequency, f);
}

static int timbradio_vidioc_g_frequency(struct file *file, void *priv,
	struct v4l2_frequency *f)
{
	struct timbradio *tr = video_drvdata(file);
	return v4l2_subdev_call(tr->sd_tuner, tuner, g_frequency, f);
}

static const struct v4l2_ioctl_ops timbradio_ioctl_ops = {
	.vidioc_querycap	= timbradio_vidioc_querycap,
	.vidioc_g_tuner		= timbradio_vidioc_g_tuner,
	.vidioc_s_tuner		= timbradio_vidioc_s_tuner,
	.vidioc_g_frequency	= timbradio_vidioc_g_frequency,
	.vidioc_s_frequency	= timbradio_vidioc_s_frequency,
	.vidioc_log_status      = v4l2_ctrl_log_status,
	.vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
	.vidioc_unsubscribe_event = v4l2_event_unsubscribe,
};

static const struct v4l2_file_operations timbradio_fops = {
	.owner		= THIS_MODULE,
	.open		= v4l2_fh_open,
	.release	= v4l2_fh_release,
	.poll		= v4l2_ctrl_poll,
	.unlocked_ioctl	= video_ioctl2,
};

static int timbradio_probe(struct platform_device *pdev)
{
	struct timb_radio_platform_data *pdata = pdev->dev.platform_data;
	struct timbradio *tr;
	int err;

	if (!pdata) {
		dev_err(&pdev->dev, "Platform data missing\n");
		err = -EINVAL;
		goto err;
	}

	tr = devm_kzalloc(&pdev->dev, sizeof(*tr), GFP_KERNEL);
	if (!tr) {
		err = -ENOMEM;
		goto err;
	}

	tr->pdata = *pdata;
	mutex_init(&tr->lock);

	strscpy(tr->video_dev.name, "Timberdale Radio",
		sizeof(tr->video_dev.name));
	tr->video_dev.fops = &timbradio_fops;

Annotation

Implementation Notes