- 根目录:
- drivers
- media
- radio
- radio-si4713.c
/*
* 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/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 <eduardo.valentin@nokia.com>");
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,
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,
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,
};
/* 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 = kzalloc(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 free_rsdev;
}
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);
free_rsdev:
kfree(rsdev);
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);
kfree(rsdev);
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);