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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* drivers/media/radio/radio-si4713.c
*
* Platform Driver for Silicon Labs Si4713 FM Radio Transmitter:
*
* Copyright (c) 2008 Instituto Nokia de Tecnologia - INdT
* Contact: Eduardo Valentin <eduardo.valentin@nokia.com>
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/i2c.h>
#include <linux/videodev2.h>
#include <linux/slab.h>
#include <media/v4l2-device.h>
#include <media/v4l2-common.h>
#include <media/v4l2-ioctl.h>
#include <media/v4l2-fh.h>
#include <media/v4l2-ctrls.h>
#include <media/v4l2-event.h>
#include "si4713.h"
/* module parameters */
static int radio_nr = -1; /* radio device minor (-1 ==> auto assign) */
module_param(radio_nr, int, 0);
MODULE_PARM_DESC(radio_nr,
"Minor number for radio device (-1 ==> auto assign)");
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Eduardo Valentin <eduardo.valentin@nokia.com>");
MODULE_DESCRIPTION("Platform driver for Si4713 FM Radio Transmitter");
MODULE_VERSION("0.0.1");
MODULE_ALIAS("platform:radio-si4713");
/* Driver state struct */
struct radio_si4713_device {
struct v4l2_device v4l2_dev;
struct video_device radio_dev;
struct mutex lock;
};
/* radio_si4713_fops - file operations interface */
static const struct v4l2_file_operations radio_si4713_fops = {
.owner = THIS_MODULE,
.open = v4l2_fh_open,
.release = v4l2_fh_release,
.poll = v4l2_ctrl_poll,
/* Note: locking is done at the subdev level in the i2c driver. */
.unlocked_ioctl = video_ioctl2,
};
/* Video4Linux Interface */
/* radio_si4713_querycap - query device capabilities */
static int radio_si4713_querycap(struct file *file, void *priv,
struct v4l2_capability *capability)
{
strscpy(capability->driver, "radio-si4713", sizeof(capability->driver));
strscpy(capability->card, "Silicon Labs Si4713 Modulator",
sizeof(capability->card));
strscpy(capability->bus_info, "platform:radio-si4713",
sizeof(capability->bus_info));
return 0;
}
/*
* v4l2 ioctl call backs.
* we are just a wrapper for v4l2_sub_devs.
*/
static inline struct v4l2_device *get_v4l2_dev(struct file *file)
{
return &((struct radio_si4713_device *)video_drvdata(file))->v4l2_dev;
}
static int radio_si4713_g_modulator(struct file *file, void *p,
struct v4l2_modulator *vm)
{
return v4l2_device_call_until_err(get_v4l2_dev(file), 0, tuner,
g_modulator, vm);
}
static int radio_si4713_s_modulator(struct file *file, void *p,
const struct v4l2_modulator *vm)
{
return v4l2_device_call_until_err(get_v4l2_dev(file), 0, tuner,
s_modulator, vm);
}
static int radio_si4713_g_frequency(struct file *file, void *p,
struct v4l2_frequency *vf)
{
return v4l2_device_call_until_err(get_v4l2_dev(file), 0, tuner,
g_frequency, vf);
}
static int radio_si4713_s_frequency(struct file *file, void *p,
const struct v4l2_frequency *vf)
{
return v4l2_device_call_until_err(get_v4l2_dev(file), 0, tuner,
s_frequency, vf);
}
static long radio_si4713_default(struct file *file, void *p,
bool valid_prio, unsigned int cmd, void *arg)
{
return v4l2_device_call_until_err(get_v4l2_dev(file), 0, core,
ioctl, cmd, arg);
}
static struct v4l2_ioctl_ops radio_si4713_ioctl_ops = {
.vidioc_querycap = radio_si4713_querycap,
.vidioc_g_modulator = radio_si4713_g_modulator,
.vidioc_s_modulator = radio_si4713_s_modulator,
.vidioc_g_frequency = radio_si4713_g_frequency,
.vidioc_s_frequency = radio_si4713_s_frequency,
.vidioc_log_status = v4l2_ctrl_log_status,
.vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
.vidioc_unsubscribe_event = v4l2_event_unsubscribe,
.vidioc_default = radio_si4713_default,
};
/* radio_si4713_vdev_template - video device interface */
static const struct video_device radio_si4713_vdev_template = {
.fops = &radio_si4713_fops,
.name = "radio-si4713",
.release = video_device_release_empty,
.ioctl_ops = &radio_si4713_ioctl_ops,
.vfl_dir = VFL_DIR_TX,
};
/* Platform driver interface */
/* radio_si4713_pdriver_probe - probe for the device */
static int radio_si4713_pdriver_probe(struct platform_device *pdev)
{
struct radio_si4713_platform_data *pdata = pdev->dev.platform_data;
struct radio_si4713_device *rsdev;
struct v4l2_subdev *sd;
int rval = 0;
if (!pdata) {
dev_err(&pdev->dev, "Cannot proceed without platform data.\n");
rval = -EINVAL;
goto exit;
}
rsdev = devm_kzalloc(&pdev->dev, sizeof(*rsdev), GFP_KERNEL);
if (!rsdev) {
dev_err(&pdev->dev, "Failed to alloc video device.\n");
rval = -ENOMEM;
goto exit;
}
mutex_init(&rsdev->lock);
rval = v4l2_device_register(&pdev->dev, &rsdev->v4l2_dev);
if (rval) {
dev_err(&pdev->dev, "Failed to register v4l2 device.\n");
goto exit;
}
sd = i2c_get_clientdata(pdata->subdev);
rval = v4l2_device_register_subdev(&rsdev->v4l2_dev, sd);
if (rval) {
dev_err(&pdev->dev, "Cannot get v4l2 subdevice\n");
goto unregister_v4l2_dev;
}
rsdev->radio_dev = radio_si4713_vdev_template;
rsdev->radio_dev.v4l2_dev = &rsdev->v4l2_dev;
rsdev->radio_dev.ctrl_handler = sd->ctrl_handler;
/* Serialize all access to the si4713 */
rsdev->radio_dev.lock = &rsdev->lock;
rsdev->radio_dev.device_caps = V4L2_CAP_MODULATOR | V4L2_CAP_RDS_OUTPUT;
video_set_drvdata(&rsdev->radio_dev, rsdev);
if (video_register_device(&rsdev->radio_dev, VFL_TYPE_RADIO, radio_nr)) {
dev_err(&pdev->dev, "Could not register video device.\n");
rval = -EIO;
goto unregister_v4l2_dev;
}
dev_info(&pdev->dev, "New device successfully probed\n");
goto exit;
unregister_v4l2_dev:
v4l2_device_unregister(&rsdev->v4l2_dev);
exit:
return rval;
}
/* radio_si4713_pdriver_remove - remove the device */
static int radio_si4713_pdriver_remove(struct platform_device *pdev)
{
struct v4l2_device *v4l2_dev = platform_get_drvdata(pdev);
struct radio_si4713_device *rsdev;
rsdev = container_of(v4l2_dev, struct radio_si4713_device, v4l2_dev);
video_unregister_device(&rsdev->radio_dev);
v4l2_device_unregister(&rsdev->v4l2_dev);
return 0;
}
static struct platform_driver radio_si4713_pdriver = {
.driver = {
.name = "radio-si4713",
},
.probe = radio_si4713_pdriver_probe,
.remove = radio_si4713_pdriver_remove,
};
module_platform_driver(radio_si4713_pdriver);
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