radio-timb.c

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/*
 * radio-timb.c Timberdale FPGA Radio driver
 * Copyright (c) 2009 Intel Corporation
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <linux/io.h>
#include <media/v4l2-ioctl.h>
#include <media/v4l2-device.h>
#include <linux/platform_device.h>
#include <linux/interrupt.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/module.h>
#include <media/timb_radio.h>

#define DRIVER_NAME "timb-radio"

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)
{
    strlcpy(v->driver, DRIVER_NAME, sizeof(v->driver));
    strlcpy(v->card, "Timberdale Radio", sizeof(v->card));
    snprintf(v->bus_info, sizeof(v->bus_info), "platform:"DRIVER_NAME);
    v->capabilities = V4L2_CAP_TUNER | V4L2_CAP_RADIO;
    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,
    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_g_input(struct file *filp, void *priv,
    unsigned int *i)
{
    *i = 0;
    return 0;
}

static int timbradio_vidioc_s_input(struct file *filp, void *priv,
    unsigned int i)
{
    return i ? -EINVAL : 0;
}

static int timbradio_vidioc_g_audio(struct file *file, void *priv,
    struct v4l2_audio *a)
{
    a->index = 0;
    strlcpy(a->name, "Radio", sizeof(a->name));
    a->capability = V4L2_AUDCAP_STEREO;
    return 0;
}

static int timbradio_vidioc_s_audio(struct file *file, void *priv,
    const struct v4l2_audio *a)
{
    return a->index ? -EINVAL : 0;
}

static int timbradio_vidioc_s_frequency(struct file *file, void *priv,
    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 int timbradio_vidioc_queryctrl(struct file *file, void *priv,
    struct v4l2_queryctrl *qc)
{
    struct timbradio *tr = video_drvdata(file);
    return v4l2_subdev_call(tr->sd_dsp, core, queryctrl, qc);
}

static int timbradio_vidioc_g_ctrl(struct file *file, void *priv,
    struct v4l2_control *ctrl)
{
    struct timbradio *tr = video_drvdata(file);
    return v4l2_subdev_call(tr->sd_dsp, core, g_ctrl, ctrl);
}

static int timbradio_vidioc_s_ctrl(struct file *file, void *priv,
    struct v4l2_control *ctrl)
{
    struct timbradio *tr = video_drvdata(file);
    return v4l2_subdev_call(tr->sd_dsp, core, s_ctrl, ctrl);
}

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_g_input     = timbradio_vidioc_g_input,
    .vidioc_s_input     = timbradio_vidioc_s_input,
    .vidioc_g_audio     = timbradio_vidioc_g_audio,
    .vidioc_s_audio     = timbradio_vidioc_s_audio,
    .vidioc_queryctrl   = timbradio_vidioc_queryctrl,
    .vidioc_g_ctrl      = timbradio_vidioc_g_ctrl,
    .vidioc_s_ctrl      = timbradio_vidioc_s_ctrl
};

static const struct v4l2_file_operations timbradio_fops = {
    .owner      = THIS_MODULE,
    .unlocked_ioctl = video_ioctl2,
};

static int __devinit 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);

    strlcpy(tr->video_dev.name, "Timberdale Radio",
        sizeof(tr->video_dev.name));
    tr->video_dev.fops = &timbradio_fops;
    tr->video_dev.ioctl_ops = &timbradio_ioctl_ops;
    tr->video_dev.release = video_device_release_empty;
    tr->video_dev.minor = -1;
    tr->video_dev.lock = &tr->lock;

    strlcpy(tr->v4l2_dev.name, DRIVER_NAME, sizeof(tr->v4l2_dev.name));
    err = v4l2_device_register(NULL, &tr->v4l2_dev);
    if (err)
        goto err;

    tr->video_dev.v4l2_dev = &tr->v4l2_dev;

    err = video_register_device(&tr->video_dev, VFL_TYPE_RADIO, -1);
    if (err) {
        dev_err(&pdev->dev, "Error reg video\n");
        goto err_video_req;
    }

    video_set_drvdata(&tr->video_dev, tr);

    platform_set_drvdata(pdev, tr);
    return 0;

err_video_req:
    video_device_release_empty(&tr->video_dev);
    v4l2_device_unregister(&tr->v4l2_dev);
err:
    dev_err(&pdev->dev, "Failed to register: %d\n", err);

    return err;
}

static int __devexit timbradio_remove(struct platform_device *pdev)
{
    struct timbradio *tr = platform_get_drvdata(pdev);

    video_unregister_device(&tr->video_dev);
    video_device_release_empty(&tr->video_dev);

    v4l2_device_unregister(&tr->v4l2_dev);

    return 0;
}

static struct platform_driver timbradio_platform_driver = {
    .driver = {
        .name   = DRIVER_NAME,
        .owner  = THIS_MODULE,
    },
    .probe      = timbradio_probe,
    .remove     = __devexit_p(timbradio_remove),
};

module_platform_driver(timbradio_platform_driver);

MODULE_DESCRIPTION("Timberdale Radio driver");
MODULE_AUTHOR("Mocean Laboratories <[email protected]>");
MODULE_LICENSE("GPL v2");
MODULE_VERSION("0.0.2");
MODULE_ALIAS("platform:"DRIVER_NAME);