On Monday 08 June 2009 10:18:05 Eduardo Valentin wrote:
> From: Eduardo Valentin <[email protected]>
>
> # HG changeset patch
> # User "Eduardo Valentin <[email protected]>"
> # Date 1244446611 -10800
> # Node ID 92ec243dd1882c136a588898dd5b7a1913ca0f4b
> # Parent 2456c8fc506ecf928d2e95da36d611d094c0ec55
> This patch adds files which creates the radio interface
> for si4713 FM transmitter devices.
>
> Priority: normal
>
> Signed-off-by: "Eduardo Valentin <[email protected]>"
>
> diff -r 2456c8fc506e -r 92ec243dd188 linux/drivers/media/radio/radio-si4713.c
> --- /dev/null Thu Jan 01 00:00:00 1970 +0000
> +++ b/linux/drivers/media/radio/radio-si4713.c Mon Jun 08 10:36:51
> 2009 +0300
> @@ -0,0 +1,332 @@
> +/*
> + * 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/version.h>
> +#include <linux/platform_device.h>
> +#include <linux/i2c.h>
> +#include <linux/videodev2.h>
> +#include <media/v4l2-device.h>
> +#include <media/v4l2-common.h>
> +#include <media/v4l2-ioctl.h>
> +
> +#include "radio-si4713.h"
> +#include "si4713.h"
> +
> +/* module parameters */
> +static int radio_nr = -1; /* radio device minor (-1 ==> auto assign) */
> +
> +/* radio_si4713_fops - file operations interface */
> +static const struct v4l2_file_operations radio_si4713_fops = {
> + .owner = THIS_MODULE,
> + .ioctl = video_ioctl2,
> +};
> +
> +/* Video4Linux Interface */
> +static int radio_si4713_vidioc_g_audio(struct file *file, void *priv,
> + struct v4l2_audio *audio)
> +{
> + if (audio->index > 1)
> + return -EINVAL;
> +
> + strncpy(audio->name, "Radio", 32);
> + audio->capability = V4L2_AUDCAP_STEREO;
> +
> + return 0;
> +}
> +
> +static int radio_si4713_vidioc_s_audio(struct file *file, void *priv,
> + struct v4l2_audio *audio)
> +{
> + if (audio->index != 0)
> + return -EINVAL;
> +
> + return 0;
> +}
This is a transmitter (aka modulator) device, so it should implement g_audout,
s_audout and enumaudout rather than s_audio and g_audio.
> +
> +static int radio_si4713_vidioc_g_input(struct file *file, void *priv,
> + unsigned int *i)
> +{
> + *i = 0;
> +
> + return 0;
> +}
> +
> +static int radio_si4713_vidioc_s_input(struct file *file, void *priv,
> + unsigned int i)
> +{
> + if (i != 0)
> + return -EINVAL;
> +
> + return 0;
> +}
These are not needed: it is an audio only device, so no video. Since g/s_input
deals with video inputs these are not relevant. And even if it was, then it
would have to be g/s_output :-)
> +
> +/* radio_si4713_vidioc_querycap - query device capabilities */
> +static int radio_si4713_vidioc_querycap(struct file *file, void *priv,
> + struct v4l2_capability *capability)
> +{
> + struct radio_si4713_device *rsdev;
> +
> + rsdev = video_get_drvdata(video_devdata(file));
> +
> + strlcpy(capability->driver, "radio-si4713", sizeof(capability->driver));
> + strlcpy(capability->card, "Silicon Labs Si4713 FM Radio Transmitter",
> + sizeof(capability->card));
> + capability->capabilities = V4L2_CAP_TUNER;
> +
> + return 0;
> +}
> +
> +/* radio_si4713_vidioc_queryctrl - enumerate control items */
> +static int radio_si4713_vidioc_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_VOLUME,
> + V4L2_CID_AUDIO_BALANCE,
> + V4L2_CID_AUDIO_BASS,
> + V4L2_CID_AUDIO_TREBLE,
> + V4L2_CID_AUDIO_LOUDNESS,
> + V4L2_CID_AUDIO_MUTE,
> + 0
> + };
> +
> + /* Must be sorted from low to high control ID! */
> + static const u32 fmtx_ctrls[] = {
> + V4L2_CID_FMTX_CLASS,
> + V4L2_CID_RDS_ENABLED,
> + V4L2_CID_RDS_PI,
> + V4L2_CID_RDS_PTY,
> + V4L2_CID_RDS_PS_NAME,
> + V4L2_CID_RDS_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_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_FMTX_CLASS)
> + return v4l2_ctrl_query_fill(qc, 0, 0, 0, 0);
> +
> + return v4l2_device_call_until_err(&rsdev->v4l2_dev, 0, core,
> + queryctrl, qc);
> +}
> +
> +
> +/*
> + * radio_si4713_vidioc_template - Produce a v4l2 vidioc call back.
> + * Can be used because we are just a wrapper for v4l2_sub_devs.
> + */
> +#define radio_si4713_vidioc_template(type, callback, arg_type)
> \
> +static int radio_si4713_vidioc_##callback(struct file *file, void *p,
> \
> + arg_type a) \
> +{ \
> + struct radio_si4713_device *rsdev; \
> + \
> + rsdev = video_get_drvdata(video_devdata(file)); \
> + \
> + return v4l2_device_call_until_err(&rsdev->v4l2_dev, 0, type, \
> + callback, a); \
> +}
> +
> +radio_si4713_vidioc_template(core, g_ext_ctrls, struct v4l2_ext_controls *)
> +radio_si4713_vidioc_template(core, s_ext_ctrls, struct v4l2_ext_controls *)
> +radio_si4713_vidioc_template(core, g_ctrl, struct v4l2_control *)
> +radio_si4713_vidioc_template(core, s_ctrl, struct v4l2_control *)
> +radio_si4713_vidioc_template(tuner, g_tuner, struct v4l2_tuner *)
> +radio_si4713_vidioc_template(tuner, s_tuner, struct v4l2_tuner *)
> +radio_si4713_vidioc_template(tuner, g_frequency, struct v4l2_frequency *)
> +radio_si4713_vidioc_template(tuner, s_frequency, struct v4l2_frequency *)
Yuck. Just write it like this:
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_vidioc_g_tuner(struct file *file, void *priv,
struct v4l2_tuner *t)
{
return v4l2_device_call_until_err(get_v4l2_dev(file), 0, tuner,
g_tuner, t);
}
It's much nicer than using macros.
I also suggest shortening the function name to si4713_g_tuner. The current
naming convention is a bit of a mouthful.
> +
> +static struct v4l2_ioctl_ops radio_si4713_ioctl_ops = {
> + .vidioc_g_input = radio_si4713_vidioc_g_input,
> + .vidioc_s_input = radio_si4713_vidioc_s_input,
> + .vidioc_g_audio = radio_si4713_vidioc_g_audio,
> + .vidioc_s_audio = radio_si4713_vidioc_s_audio,
> + .vidioc_querycap = radio_si4713_vidioc_querycap,
> + .vidioc_queryctrl = radio_si4713_vidioc_queryctrl,
> + .vidioc_g_ext_ctrls = radio_si4713_vidioc_g_ext_ctrls,
> + .vidioc_s_ext_ctrls = radio_si4713_vidioc_s_ext_ctrls,
> + .vidioc_g_ctrl = radio_si4713_vidioc_g_ctrl,
> + .vidioc_s_ctrl = radio_si4713_vidioc_s_ctrl,
> + .vidioc_g_tuner = radio_si4713_vidioc_g_tuner,
> + .vidioc_s_tuner = radio_si4713_vidioc_s_tuner,
It's a modulator device, so it should implement g/s_modulator rather than
g/s_tuner.
Now, here I am running into a problem: looking at section 1.6.2 in the v4l2
spec I see that in QUERYCAP you are supposed to return CAP_TUNER and rely on
ENUMOUTPUT to determine which output has a modulator. I think it is nuts that
there is no CAP_MODULATOR. I propose adding this. There are currently NO
modulator drivers in v4l-dvb, nor have I ever heard from out-of-tree
modulator drivers (not that I particularly care about that), so it should be
safe to add it.
The next problem is that ENUMOUTPUT does not apply to a radio modulator.
This problem is actually also present on radio tuners. Currently all radio
tuner drivers implement g/s_input and g/s_audio but no enuminput or enumaudio.
I think g/s_input is bogus since these devices have no video inputs.
However, neither g/s_audio nor enumaudio can currently tell the application
whether the audio input is connected to a tuner. Only enuminput can do that
currently. This would be an argument for using g/s_input if it wasn't for
the fact that none of the radio drivers actually implements enuminput.
I propose adding a V4L2_AUDCAP_TUNER capability telling this application
that the audio input is connected to a tuner, and adding a
V4L2_AUDOUTCAP_MODULATOR capability for struct v4l2_audioout to do the same
for a modulator.
Comments?
Regards,
Hans
> + .vidioc_g_frequency = radio_si4713_vidioc_g_frequency,
> + .vidioc_s_frequency = radio_si4713_vidioc_s_frequency,
> +};
> +
> +/* 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, "si4713_i2c",
> + pdata->subdev_board_info, NULL);
> + if (!sd) {
> + dev_err(&pdev->dev, "Cannot get v4l2 subdevice\n");
> + rval = -ENODEV;
> + goto unregister_v4l2_dev;
> + }
> +
> + rsdev->radio_dev = video_device_alloc();
> + if (!rsdev->radio_dev) {
> + dev_err(&pdev->dev, "Failed to alloc video device.\n");
> + rval = -ENOMEM;
> + goto unregister_v4l2_dev;
> + }
> +
> + 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);
> +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);
> +
> + video_unregister_device(rsdev->radio_dev);
> + 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 Interface */
> +static int __init radio_si4713_module_init(void)
> +{
> + return platform_driver_register(&radio_si4713_pdriver);
> +}
> +
> +static void __exit radio_si4713_module_exit(void)
> +{
> + platform_driver_unregister(&radio_si4713_pdriver);
> +}
> +
> +module_init(radio_si4713_module_init);
> +module_exit(radio_si4713_module_exit);
> +
> +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");
> diff -r 2456c8fc506e -r 92ec243dd188 linux/drivers/media/radio/radio-si4713.h
> --- /dev/null Thu Jan 01 00:00:00 1970 +0000
> +++ b/linux/drivers/media/radio/radio-si4713.h Mon Jun 08 10:36:51
> 2009 +0300
> @@ -0,0 +1,48 @@
> +/*
> + * drivers/media/radio/radio-si4713.h
> + *
> + * Property and commands definitions for Si4713 radio transmitter chip.
> + *
> + * Copyright (c) 2008 Instituto Nokia de Tecnologia - INdT
> + * Contact: Eduardo Valentin <[email protected]>
> + *
> + * This file is licensed under the terms of the GNU General Public License
> + * version 2. This program is licensed "as is" without any warranty of any
> + * kind, whether express or implied.
> + *
> + */
> +
> +#ifndef RADIO_SI4713_H
> +#define RADIO_SI4713_H
> +
> +#include <linux/i2c.h>
> +#include <media/v4l2-device.h>
> +
> +#define SI4713_NAME "radio-si4713"
> +
> +/* The SI4713 I2C sensor chip has a fixed slave address of 0xc6. */
> +#define SI4713_I2C_ADDR_BUSEN_HIGH 0x63
> +#define SI4713_I2C_ADDR_BUSEN_LOW 0x11
> +
> +/*
> + * Platform dependent definition
> + */
> +struct si4713_platform_data {
> + /* Set power state, zero is off, non-zero is on. */
> + int (*set_power)(int power);
> +};
> +
> +/*
> + * Platform driver device state struct
> + */
> +struct radio_si4713_device {
> + struct v4l2_device v4l2_dev;
> + struct video_device *radio_dev;
> +};
> +
> +struct radio_si4713_platform_data {
> + int i2c_bus;
> + struct i2c_board_info *subdev_board_info;
> +};
> +
> +#endif /* ifndef RADIO_SI4713_H*/
>
>
--
Hans Verkuil - video4linux developer - sponsored by TANDBERG Telecom
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