drivers/media/radio/radio-si4713.c - kernel/common - Git at Google

 /*
  * 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 <[email protected]>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation; either version 2 of the License, or
  * (at your option) any later version.
  *
  * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  */

 #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/radio-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");
 MODULE_AUTHOR("Eduardo Valentin <[email protected]>");
 MODULE_DESCRIPTION("Platform driver for Si4713 FM Radio Transmitter");
 MODULE_VERSION("0.0.1");

 /* Driver state struct */
 struct radio_si4713_device {
 	struct v4l2_device		v4l2_dev;
 	struct video_device		*radio_dev;
 };

 /* radio_si4713_fops - file operations interface */
 static const struct v4l2_file_operations radio_si4713_fops = {
 	.owner		= THIS_MODULE,
 	/* Note: locking is done at the subdev level in the i2c driver. */
 	.unlocked_ioctl	= video_ioctl2,
 };

 /* Video4Linux Interface */
 static int radio_si4713_fill_audout(struct v4l2_audioout *vao)
 {
 	/* TODO: check presence of audio output */
 	strlcpy(vao->name, "FM Modulator Audio Out", 32);

 	return 0;
 }

 static int radio_si4713_enumaudout(struct file *file, void *priv,
 						struct v4l2_audioout *vao)
 {
 	return radio_si4713_fill_audout(vao);
 }

 static int radio_si4713_g_audout(struct file *file, void *priv,
 					struct v4l2_audioout *vao)
 {
 	int rval = radio_si4713_fill_audout(vao);

 	vao->index = 0;

 	return rval;
 }

 static int radio_si4713_s_audout(struct file *file, void *priv,
 					const struct v4l2_audioout *vao)
 {
 	return vao->index ? -EINVAL : 0;
 }

 /* radio_si4713_querycap - query device capabilities */
 static int radio_si4713_querycap(struct file *file, void *priv,
 					struct v4l2_capability *capability)
 {
 	strlcpy(capability->driver, "radio-si4713", sizeof(capability->driver));
 	strlcpy(capability->card, "Silicon Labs Si4713 Modulator",
 				sizeof(capability->card));
 	capability->capabilities = V4L2_CAP_MODULATOR | V4L2_CAP_RDS_OUTPUT;

 	return 0;
 }

 /* radio_si4713_queryctrl - enumerate control items */
 static int radio_si4713_queryctrl(struct file *file, void *priv,
 						struct v4l2_queryctrl *qc)
 {
 	/* Must be sorted from low to high control ID! */
 	static const u32 user_ctrls[] = {
 		V4L2_CID_USER_CLASS,
 		V4L2_CID_AUDIO_MUTE,
 		0
 	};

 	/* Must be sorted from low to high control ID! */
 	static const u32 fmtx_ctrls[] = {
 		V4L2_CID_FM_TX_CLASS,
 		V4L2_CID_RDS_TX_DEVIATION,
 		V4L2_CID_RDS_TX_PI,
 		V4L2_CID_RDS_TX_PTY,
 		V4L2_CID_RDS_TX_PS_NAME,
 		V4L2_CID_RDS_TX_RADIO_TEXT,
 		V4L2_CID_AUDIO_LIMITER_ENABLED,
 		V4L2_CID_AUDIO_LIMITER_RELEASE_TIME,
 		V4L2_CID_AUDIO_LIMITER_DEVIATION,
 		V4L2_CID_AUDIO_COMPRESSION_ENABLED,
 		V4L2_CID_AUDIO_COMPRESSION_GAIN,
 		V4L2_CID_AUDIO_COMPRESSION_THRESHOLD,
 		V4L2_CID_AUDIO_COMPRESSION_ATTACK_TIME,
 		V4L2_CID_AUDIO_COMPRESSION_RELEASE_TIME,
 		V4L2_CID_PILOT_TONE_ENABLED,
 		V4L2_CID_PILOT_TONE_DEVIATION,
 		V4L2_CID_PILOT_TONE_FREQUENCY,
 		V4L2_CID_TUNE_PREEMPHASIS,
 		V4L2_CID_TUNE_POWER_LEVEL,
 		V4L2_CID_TUNE_ANTENNA_CAPACITOR,
 		0
 	};
 	static const u32 *ctrl_classes[] = {
 		user_ctrls,
 		fmtx_ctrls,
 		NULL
 	};
 	struct radio_si4713_device *rsdev;

 	rsdev = video_get_drvdata(video_devdata(file));

 	qc->id = v4l2_ctrl_next(ctrl_classes, qc->id);
 	if (qc->id == 0)
 		return -EINVAL;

 	if (qc->id == V4L2_CID_USER_CLASS || qc->id == V4L2_CID_FM_TX_CLASS)
 		return v4l2_ctrl_query_fill(qc, 0, 0, 0, 0);

 	return v4l2_device_call_until_err(&rsdev->v4l2_dev, 0, core,
 						queryctrl, qc);
 }

 /*
  * 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_ext_ctrls(struct file *file, void *p,
 						struct v4l2_ext_controls *vecs)
 {
 	return v4l2_device_call_until_err(get_v4l2_dev(file), 0, core,
 							g_ext_ctrls, vecs);
 }

 static int radio_si4713_s_ext_ctrls(struct file *file, void *p,
 						struct v4l2_ext_controls *vecs)
 {
 	return v4l2_device_call_until_err(get_v4l2_dev(file), 0, core,
 							s_ext_ctrls, vecs);
 }

 static int radio_si4713_g_ctrl(struct file *file, void *p,
 						struct v4l2_control *vc)
 {
 	return v4l2_device_call_until_err(get_v4l2_dev(file), 0, core,
 							g_ctrl, vc);
 }

 static int radio_si4713_s_ctrl(struct file *file, void *p,
 						struct v4l2_control *vc)
 {
 	return v4l2_device_call_until_err(get_v4l2_dev(file), 0, core,
 							s_ctrl, vc);
 }

 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,
 						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, 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_enumaudout	= radio_si4713_enumaudout,
 	.vidioc_g_audout	= radio_si4713_g_audout,
 	.vidioc_s_audout	= radio_si4713_s_audout,
 	.vidioc_querycap	= radio_si4713_querycap,
 	.vidioc_queryctrl	= radio_si4713_queryctrl,
 	.vidioc_g_ext_ctrls	= radio_si4713_g_ext_ctrls,
 	.vidioc_s_ext_ctrls	= radio_si4713_s_ext_ctrls,
 	.vidioc_g_ctrl		= radio_si4713_g_ctrl,
 	.vidioc_s_ctrl		= radio_si4713_s_ctrl,
 	.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_default		= radio_si4713_default,
 };

 /* radio_si4713_vdev_template - video device interface */
 static struct video_device radio_si4713_vdev_template = {
 	.fops			= &radio_si4713_fops,
 	.name			= "radio-si4713",
 	.release		= video_device_release,
 	.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 i2c_adapter *adapter;
 	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;
 	}

 	rval = v4l2_device_register(&pdev->dev, &rsdev->v4l2_dev);
 	if (rval) {
 		dev_err(&pdev->dev, "Failed to register v4l2 device.\n");
 		goto exit;
 	}

 	adapter = i2c_get_adapter(pdata->i2c_bus);
 	if (!adapter) {
 		dev_err(&pdev->dev, "Cannot get i2c adapter %d\n",
 							pdata->i2c_bus);
 		rval = -ENODEV;
 		goto unregister_v4l2_dev;
 	}

 	sd = v4l2_i2c_new_subdev_board(&rsdev->v4l2_dev, adapter,
 					pdata->subdev_board_info, NULL);
 	if (!sd) {
 		dev_err(&pdev->dev, "Cannot get v4l2 subdevice\n");
 		rval = -ENODEV;
 		goto put_adapter;
 	}

 	rsdev->radio_dev = video_device_alloc();
 	if (!rsdev->radio_dev) {
 		dev_err(&pdev->dev, "Failed to alloc video device.\n");
 		rval = -ENOMEM;
 		goto put_adapter;
 	}

 	memcpy(rsdev->radio_dev, &radio_si4713_vdev_template,
 			sizeof(radio_si4713_vdev_template));
 	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 free_vdev;
 	}
 	dev_info(&pdev->dev, "New device successfully probed\n");

 	goto exit;

 free_vdev:
 	video_device_release(rsdev->radio_dev);
 put_adapter:
 	i2c_put_adapter(adapter);
 unregister_v4l2_dev:
 	v4l2_device_unregister(&rsdev->v4l2_dev);
 exit:
 	return rval;
 }

 /* radio_si4713_pdriver_remove - remove the device */
 static int __exit radio_si4713_pdriver_remove(struct platform_device *pdev)
 {
 	struct v4l2_device *v4l2_dev = platform_get_drvdata(pdev);
 	struct radio_si4713_device *rsdev = container_of(v4l2_dev,
 						struct radio_si4713_device,
 						v4l2_dev);
 	struct v4l2_subdev *sd = list_entry(v4l2_dev->subdevs.next,
 					    struct v4l2_subdev, list);
 	struct i2c_client *client = v4l2_get_subdevdata(sd);

 	video_unregister_device(rsdev->radio_dev);
 	i2c_put_adapter(client->adapter);
 	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         = __exit_p(radio_si4713_pdriver_remove),
 };

 module_platform_driver(radio_si4713_pdriver);
	/*
	* 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 <[email protected]>
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License as published by
	* the Free Software Foundation; either version 2 of the License, or
	* (at your option) any later version.
	*
	* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	*/

	#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/radio-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");
	MODULE_AUTHOR("Eduardo Valentin <[email protected]>");
	MODULE_DESCRIPTION("Platform driver for Si4713 FM Radio Transmitter");
	MODULE_VERSION("0.0.1");

	/* Driver state struct */
	struct radio_si4713_device {
	struct v4l2_device v4l2_dev;
	struct video_device *radio_dev;
	};

	/* radio_si4713_fops - file operations interface */
	static const struct v4l2_file_operations radio_si4713_fops = {
	.owner = THIS_MODULE,
	/* Note: locking is done at the subdev level in the i2c driver. */
	.unlocked_ioctl = video_ioctl2,
	};

	/* Video4Linux Interface */
	static int radio_si4713_fill_audout(struct v4l2_audioout *vao)
	{
	/* TODO: check presence of audio output */
	strlcpy(vao->name, "FM Modulator Audio Out", 32);

	return 0;
	}

	static int radio_si4713_enumaudout(struct file file, void priv,
	struct v4l2_audioout *vao)
	{
	return radio_si4713_fill_audout(vao);
	}

	static int radio_si4713_g_audout(struct file file, void priv,
	struct v4l2_audioout *vao)
	{
	int rval = radio_si4713_fill_audout(vao);

	vao->index = 0;

	return rval;
	}

	static int radio_si4713_s_audout(struct file file, void priv,
	const struct v4l2_audioout *vao)
	{
	return vao->index ? -EINVAL : 0;
	}

	/* radio_si4713_querycap - query device capabilities */
	static int radio_si4713_querycap(struct file file, void priv,
	struct v4l2_capability *capability)
	{
	strlcpy(capability->driver, "radio-si4713", sizeof(capability->driver));
	strlcpy(capability->card, "Silicon Labs Si4713 Modulator",
	sizeof(capability->card));
	capability->capabilities = V4L2_CAP_MODULATOR \| V4L2_CAP_RDS_OUTPUT;

	return 0;
	}

	/* radio_si4713_queryctrl - enumerate control items */
	static int radio_si4713_queryctrl(struct file file, void priv,
	struct v4l2_queryctrl *qc)
	{
	/* Must be sorted from low to high control ID! */
	static const u32 user_ctrls[] = {
	V4L2_CID_USER_CLASS,
	V4L2_CID_AUDIO_MUTE,
	0
	};

	/* Must be sorted from low to high control ID! */
	static const u32 fmtx_ctrls[] = {
	V4L2_CID_FM_TX_CLASS,
	V4L2_CID_RDS_TX_DEVIATION,
	V4L2_CID_RDS_TX_PI,
	V4L2_CID_RDS_TX_PTY,
	V4L2_CID_RDS_TX_PS_NAME,
	V4L2_CID_RDS_TX_RADIO_TEXT,
	V4L2_CID_AUDIO_LIMITER_ENABLED,
	V4L2_CID_AUDIO_LIMITER_RELEASE_TIME,
	V4L2_CID_AUDIO_LIMITER_DEVIATION,
	V4L2_CID_AUDIO_COMPRESSION_ENABLED,
	V4L2_CID_AUDIO_COMPRESSION_GAIN,
	V4L2_CID_AUDIO_COMPRESSION_THRESHOLD,
	V4L2_CID_AUDIO_COMPRESSION_ATTACK_TIME,
	V4L2_CID_AUDIO_COMPRESSION_RELEASE_TIME,
	V4L2_CID_PILOT_TONE_ENABLED,
	V4L2_CID_PILOT_TONE_DEVIATION,
	V4L2_CID_PILOT_TONE_FREQUENCY,
	V4L2_CID_TUNE_PREEMPHASIS,
	V4L2_CID_TUNE_POWER_LEVEL,
	V4L2_CID_TUNE_ANTENNA_CAPACITOR,
	0
	};
	static const u32 *ctrl_classes[] = {
	user_ctrls,
	fmtx_ctrls,
	NULL
	};
	struct radio_si4713_device *rsdev;

	rsdev = video_get_drvdata(video_devdata(file));

	qc->id = v4l2_ctrl_next(ctrl_classes, qc->id);
	if (qc->id == 0)
	return -EINVAL;

	if (qc->id == V4L2_CID_USER_CLASS \|\| qc->id == V4L2_CID_FM_TX_CLASS)
	return v4l2_ctrl_query_fill(qc, 0, 0, 0, 0);

	return v4l2_device_call_until_err(&rsdev->v4l2_dev, 0, core,
	queryctrl, qc);
	}

	/*
	* 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_ext_ctrls(struct file file, void p,
	struct v4l2_ext_controls *vecs)
	{
	return v4l2_device_call_until_err(get_v4l2_dev(file), 0, core,
	g_ext_ctrls, vecs);
	}

	static int radio_si4713_s_ext_ctrls(struct file file, void p,
	struct v4l2_ext_controls *vecs)
	{
	return v4l2_device_call_until_err(get_v4l2_dev(file), 0, core,
	s_ext_ctrls, vecs);
	}

	static int radio_si4713_g_ctrl(struct file file, void p,
	struct v4l2_control *vc)
	{
	return v4l2_device_call_until_err(get_v4l2_dev(file), 0, core,
	g_ctrl, vc);
	}

	static int radio_si4713_s_ctrl(struct file file, void p,
	struct v4l2_control *vc)
	{
	return v4l2_device_call_until_err(get_v4l2_dev(file), 0, core,
	s_ctrl, vc);
	}

	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,
	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, 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_enumaudout = radio_si4713_enumaudout,
	.vidioc_g_audout = radio_si4713_g_audout,
	.vidioc_s_audout = radio_si4713_s_audout,
	.vidioc_querycap = radio_si4713_querycap,
	.vidioc_queryctrl = radio_si4713_queryctrl,
	.vidioc_g_ext_ctrls = radio_si4713_g_ext_ctrls,
	.vidioc_s_ext_ctrls = radio_si4713_s_ext_ctrls,
	.vidioc_g_ctrl = radio_si4713_g_ctrl,
	.vidioc_s_ctrl = radio_si4713_s_ctrl,
	.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_default = radio_si4713_default,
	};

	/* radio_si4713_vdev_template - video device interface */
	static struct video_device radio_si4713_vdev_template = {
	.fops = &radio_si4713_fops,
	.name = "radio-si4713",
	.release = video_device_release,
	.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 i2c_adapter *adapter;
	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;
	}

	rval = v4l2_device_register(&pdev->dev, &rsdev->v4l2_dev);
	if (rval) {
	dev_err(&pdev->dev, "Failed to register v4l2 device.\n");
	goto exit;
	}

	adapter = i2c_get_adapter(pdata->i2c_bus);
	if (!adapter) {
	dev_err(&pdev->dev, "Cannot get i2c adapter %d\n",
	pdata->i2c_bus);
	rval = -ENODEV;
	goto unregister_v4l2_dev;
	}

	sd = v4l2_i2c_new_subdev_board(&rsdev->v4l2_dev, adapter,
	pdata->subdev_board_info, NULL);
	if (!sd) {
	dev_err(&pdev->dev, "Cannot get v4l2 subdevice\n");
	rval = -ENODEV;
	goto put_adapter;
	}

	rsdev->radio_dev = video_device_alloc();
	if (!rsdev->radio_dev) {
	dev_err(&pdev->dev, "Failed to alloc video device.\n");
	rval = -ENOMEM;
	goto put_adapter;
	}

	memcpy(rsdev->radio_dev, &radio_si4713_vdev_template,
	sizeof(radio_si4713_vdev_template));
	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 free_vdev;
	}
	dev_info(&pdev->dev, "New device successfully probed\n");

	goto exit;

	free_vdev:
	video_device_release(rsdev->radio_dev);
	put_adapter:
	i2c_put_adapter(adapter);
	unregister_v4l2_dev:
	v4l2_device_unregister(&rsdev->v4l2_dev);
	exit:
	return rval;
	}

	/* radio_si4713_pdriver_remove - remove the device */
	static int __exit radio_si4713_pdriver_remove(struct platform_device *pdev)
	{
	struct v4l2_device *v4l2_dev = platform_get_drvdata(pdev);
	struct radio_si4713_device *rsdev = container_of(v4l2_dev,
	struct radio_si4713_device,
	v4l2_dev);
	struct v4l2_subdev *sd = list_entry(v4l2_dev->subdevs.next,
	struct v4l2_subdev, list);
	struct i2c_client *client = v4l2_get_subdevdata(sd);

	video_unregister_device(rsdev->radio_dev);
	i2c_put_adapter(client->adapter);
	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 = __exit_p(radio_si4713_pdriver_remove),
	};

	module_platform_driver(radio_si4713_pdriver);