drivers/media/radio/si4713/radio-platform-si4713.c - arm/linux-arm-legacy - 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 <eduardo.valentin@nokia.com>
  *
  * 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/v4l2-fh.h>
 #include <media/v4l2-ctrls.h>
 #include <media/v4l2-event.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 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)
 {
 	strlcpy(capability->driver, "radio-si4713", sizeof(capability->driver));
 	strlcpy(capability->card, "Silicon Labs Si4713 Modulator",
 		sizeof(capability->card));
 	strlcpy(capability->bus_info, "platform:radio-si4713",
 		sizeof(capability->bus_info));
 	capability->device_caps = V4L2_CAP_MODULATOR | V4L2_CAP_RDS_OUTPUT;
 	capability->capabilities = capability->device_caps | V4L2_CAP_DEVICE_CAPS;

 	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 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 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;
 	}
 	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;
 	}

 	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 = radio_si4713_vdev_template;
 	rsdev->radio_dev.v4l2_dev = &rsdev->v4l2_dev;
 	rsdev->radio_dev.ctrl_handler = sd->ctrl_handler;
 	set_bit(V4L2_FL_USE_FH_PRIO, &rsdev->radio_dev.flags);
 	/* Serialize all access to the si4713 */
 	rsdev->radio_dev.lock = &rsdev->lock;
 	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 put_adapter;
 	}
 	dev_info(&pdev->dev, "New device successfully probed\n");

 	goto exit;

 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 radio_si4713_pdriver_remove(struct platform_device *pdev)
 {
 	struct v4l2_device *v4l2_dev = platform_get_drvdata(pdev);
 	struct v4l2_subdev *sd = list_entry(v4l2_dev->subdevs.next,
 					    struct v4l2_subdev, list);
 	struct i2c_client *client = v4l2_get_subdevdata(sd);
 	struct radio_si4713_device *rsdev;

 	rsdev = container_of(v4l2_dev, struct radio_si4713_device, v4l2_dev);
 	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",
 		.owner	= THIS_MODULE,
 	},
 	.probe		= radio_si4713_pdriver_probe,
 	.remove         = 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 <eduardo.valentin@nokia.com>
	*
	* 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/v4l2-fh.h>
	#include <media/v4l2-ctrls.h>
	#include <media/v4l2-event.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 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)
	{
	strlcpy(capability->driver, "radio-si4713", sizeof(capability->driver));
	strlcpy(capability->card, "Silicon Labs Si4713 Modulator",
	sizeof(capability->card));
	strlcpy(capability->bus_info, "platform:radio-si4713",
	sizeof(capability->bus_info));
	capability->device_caps = V4L2_CAP_MODULATOR \| V4L2_CAP_RDS_OUTPUT;
	capability->capabilities = capability->device_caps \| V4L2_CAP_DEVICE_CAPS;

	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 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 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;
	}
	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;
	}

	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 = radio_si4713_vdev_template;
	rsdev->radio_dev.v4l2_dev = &rsdev->v4l2_dev;
	rsdev->radio_dev.ctrl_handler = sd->ctrl_handler;
	set_bit(V4L2_FL_USE_FH_PRIO, &rsdev->radio_dev.flags);
	/* Serialize all access to the si4713 */
	rsdev->radio_dev.lock = &rsdev->lock;
	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 put_adapter;
	}
	dev_info(&pdev->dev, "New device successfully probed\n");

	goto exit;

	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 radio_si4713_pdriver_remove(struct platform_device *pdev)
	{
	struct v4l2_device *v4l2_dev = platform_get_drvdata(pdev);
	struct v4l2_subdev *sd = list_entry(v4l2_dev->subdevs.next,
	struct v4l2_subdev, list);
	struct i2c_client *client = v4l2_get_subdevdata(sd);
	struct radio_si4713_device *rsdev;

	rsdev = container_of(v4l2_dev, struct radio_si4713_device, v4l2_dev);
	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",
	.owner = THIS_MODULE,
	},
	.probe = radio_si4713_pdriver_probe,
	.remove = radio_si4713_pdriver_remove,
	};

	module_platform_driver(radio_si4713_pdriver);