Huang Shijie wrote:
> This module contains codes for radio.
> The radio use the ALSA audio as input.
>
> The mplayer should be compiled with --enable-radio and
> --enable-radio-capture.
> The command runs as this(assume the alsa audio registers to card 1):
> #mplayer radio://103.7/capture/ -radio
> adevice=hw=1,0:arate=48000 -rawaudio rate=48000:channels=2
>
> Signed-off-by: Huang Shijie <shijie8@xxxxxxxxx>
> ---
> drivers/media/video/tlg2300/pd-radio.c | 383 ++++++++++++++++++++++++++++++++
> 1 files changed, 383 insertions(+), 0 deletions(-)
> create mode 100644 drivers/media/video/tlg2300/pd-radio.c
>
> diff --git a/drivers/media/video/tlg2300/pd-radio.c b/drivers/media/video/tlg2300/pd-radio.c
> new file mode 100644
> index 0000000..2576f3a
> --- /dev/null
> +++ b/drivers/media/video/tlg2300/pd-radio.c
> @@ -0,0 +1,383 @@
> +#include <linux/init.h>
> +#include <linux/list.h>
> +#include <linux/module.h>
> +#include <linux/kernel.h>
> +#include <linux/bitmap.h>
> +#include <linux/usb.h>
> +#include <linux/i2c.h>
> +#include <media/v4l2-dev.h>
> +#include <linux/version.h>
> +#include <linux/mm.h>
> +#include <linux/mutex.h>
> +#include <media/v4l2-ioctl.h>
> +#include <linux/sched.h>
> +
> +#include "pd-common.h"
> +#include "vendorcmds.h"
> +
> +static int set_frequency(struct poseidon *p, __u32 frequency);
> +static int poseidon_fm_close(struct file *filp);
> +static int poseidon_fm_open(struct file *filp);
> +static int __poseidon_fm_close(struct file *filp);
> +
> +#define TUNER_FREQ_MIN_FM 76000000
> +#define TUNER_FREQ_MAX_FM 108000000
> +
> +static int poseidon_check_mode_radio(struct poseidon *p)
> +{
> + int ret, radiomode;
> + u32 status;
> +
> + set_current_state(TASK_INTERRUPTIBLE);
> + schedule_timeout(HZ/2);
> + ret = usb_set_interface(p->udev, 0, BULK_ALTERNATE_IFACE);
> + if (ret < 0)
> + goto out;
> +
> + ret = set_tuner_mode(p, TLG_MODE_FM_RADIO);
> + if (ret != 0)
> + goto out;
> +
> + ret = send_set_req(p, SGNL_SRC_SEL, TLG_SIG_SRC_ANTENNA, &status);
> + radiomode = get_audio_std(TLG_MODE_FM_RADIO, p->country_code);
> + ret = send_set_req(p, TUNER_AUD_ANA_STD, radiomode, &status);
> + ret |= send_set_req(p, TUNER_AUD_MODE,
> + TLG_TUNE_TVAUDIO_MODE_STEREO, &status);
> + ret |= send_set_req(p, AUDIO_SAMPLE_RATE_SEL,
> + ATV_AUDIO_RATE_48K, &status);
> + ret |= send_set_req(p, TUNE_FREQ_SELECT, TUNER_FREQ_MIN_FM, &status);
> +out:
> + return ret;
> +}
> +
> +static int pm_fm_suspend(struct poseidon *p)
> +{
> + pm_alsa_suspend(p);
> + usb_set_interface(p->udev, 0, 0);
> + mdelay(2000);
> + return 0;
> +}
> +
> +static int pm_fm_resume(struct poseidon *p)
> +{
> + if (in_hibernation(p)) {
> + __poseidon_fm_close(p->file_for_stream);
> + return 0;
> + }
> + poseidon_check_mode_radio(p);
> + set_frequency(p, p->radio_data.fm_freq);
> + pm_alsa_resume(p);
> + return 0;
> +}
> +
> +static int poseidon_fm_open(struct file *filp)
> +{
> + struct video_device *vfd = video_devdata(filp);
> + struct poseidon *p = video_get_drvdata(vfd);
> + int ret = 0;
> +
> + if (!p)
> + return -1;
> +
> + mutex_lock(&p->lock);
> + if (p->state & POSEIDON_STATE_DISCONNECT) {
> + ret = -ENODEV;
> + goto out;
> + }
> +
> + if (p->state && !(p->state & POSEIDON_STATE_FM)) {
> + ret = -EBUSY;
> + goto out;
> + }
> +
> + usb_autopm_get_interface(p->interface);
> + if (0 == p->state) {
> + p->country_code = country_code;
> + set_debug_mode(vfd, debug_mode);
> +
> + ret = poseidon_check_mode_radio(p);
> + if (ret < 0)
> + goto out;
> + p->state |= POSEIDON_STATE_FM;
> + }
> + p->radio_data.users++;
> + kref_get(&p->kref);
> + filp->private_data = p;
> +out:
> + mutex_unlock(&p->lock);
> + return ret;
> +}
> +
> +static int __poseidon_fm_close(struct file *filp)
> +{
> + struct poseidon *p = filp->private_data;
> + struct radio_data *fm = &p->radio_data;
> + uint32_t status;
> +
> + mutex_lock(&p->lock);
> + fm->users--;
> + if (0 == fm->users)
> + p->state &= ~POSEIDON_STATE_FM;
> +
> + if (fm->is_radio_streaming && filp == p->file_for_stream) {
> + fm->is_radio_streaming = 0;
> + send_set_req(p, PLAY_SERVICE, TLG_TUNE_PLAY_SVC_STOP, &status);
> + }
> + mutex_unlock(&p->lock);
> +
> + kref_put(&p->kref, poseidon_delete);
> + filp->private_data = NULL;
> + return 0;
> +}
> +
> +static int poseidon_fm_close(struct file *filp)
> +{
> + struct poseidon *p = filp->private_data;
> +
> + __poseidon_fm_close(filp);
> + usb_autopm_put_interface(p->interface);
> + return 0;
> +}
> +
> +static int vidioc_querycap(struct file *file, void *priv,
> + struct v4l2_capability *v)
> +{
> + strlcpy(v->driver, "radio-tele", sizeof(v->driver));
> + strlcpy(v->card, "telegent Radio", sizeof(v->card));
> + sprintf(v->bus_info, "USB");
> + v->version = 0;
> + v->capabilities = V4L2_CAP_TUNER | V4L2_CAP_RADIO;
> + return 0;
> +}
The same comments I made to the video part applies here: bus_info/version/capabilities are wrong.
Also, V4L2 spec says that you should be able to access the radio mode on any interface
(yes, you can use /dev/video0 to listen to radio).
Not all drivers implement it correctly, though.
> +
> +static long pd_radio_ioctls(struct file *file,
> + unsigned int cmd, unsigned long arg)
> +{
> + struct poseidon *p = file->private_data;
> + unsigned long ret;
> + int country_code;
> +
> + if (in_hibernation(p))
> + return -1;
> +
> + if (cmd == PD_COUNTRY_CODE) {
> + ret = copy_from_user(&country_code, (void __user *)arg,
> + sizeof(country_code));
> + if (0 == ret) {
> + p->country_code = country_code;
> + return 0;
> + } else
> + return -EAGAIN;
> + }
Don't add a country_code. The FM range can be specified via V4L2 calls,
and I think we ended by adding a ctrl to set the pre-emphasis. Userspace
should set pre-emphasis/FM range based on a country code set it might have.
> + return video_ioctl2(file, cmd, arg);
> +}
> +
> +static const struct v4l2_file_operations poseidon_fm_fops = {
> + .owner = THIS_MODULE,
> + .open = poseidon_fm_open,
> + .release = poseidon_fm_close,
> + .ioctl = pd_radio_ioctls,
> +};
> +
> +int tlg_fm_vidioc_g_tuner(struct file *file, void *priv, struct v4l2_tuner *vt)
> +{
> + struct tuner_fm_sig_stat_s fm_stat = {};
> + int ret, status, count = 5;
> + struct poseidon *p = file->private_data;
> +
> + if (vt->index != 0)
> + return -EINVAL;
> +
> + vt->type = V4L2_TUNER_RADIO;
> + vt->capability = V4L2_TUNER_CAP_STEREO;
> + vt->rangelow = TUNER_FREQ_MIN_FM / 62500;
> + vt->rangehigh = TUNER_FREQ_MAX_FM / 62500;
> + vt->rxsubchans = V4L2_TUNER_SUB_STEREO;
> + vt->audmode = V4L2_TUNER_MODE_STEREO;
> + vt->signal = 0;
> + vt->afc = 0;
> +
> + mutex_lock(&p->lock);
> + ret = send_get_req(p, TUNER_STATUS, TLG_MODE_FM_RADIO,
> + &fm_stat, &status, sizeof(fm_stat));
> +
> + while (fm_stat.sig_lock_busy && count-- && !ret) {
> + set_current_state(TASK_INTERRUPTIBLE);
> + schedule_timeout(HZ);
> +
> + ret = send_get_req(p, TUNER_STATUS, TLG_MODE_FM_RADIO,
> + &fm_stat, &status, sizeof(fm_stat));
> + }
> + mutex_unlock(&p->lock);
> +
> + if (ret || status) {
> + vt->signal = 0;
> + } else if ((fm_stat.sig_present || fm_stat.sig_locked)
> + && fm_stat.sig_strength == 0) {
> + vt->signal = 0xffff;
> + } else
> + vt->signal = (fm_stat.sig_strength * 255 / 10) << 8;
> +
> + return 0;
> +}
> +
> +int fm_get_freq(struct file *file, void *priv, struct v4l2_frequency *argp)
> +{
> + struct poseidon *p = file->private_data;
> +
> + argp->frequency = p->radio_data.fm_freq;
> + return 0;
> +}
> +
> +static int set_frequency(struct poseidon *p, __u32 frequency)
> +{
> + __u32 freq ;
> + int ret, status, radiomode;
> +
> + mutex_lock(&p->lock);
> +
> + radiomode = get_audio_std(TLG_MODE_FM_RADIO, p->country_code);
> + /*NTSC 8,PAL 2 */
> + ret = send_set_req(p, TUNER_AUD_ANA_STD, radiomode, &status);
> +
> + freq = (frequency * 125) * 500 / 1000;/* kHZ */
> + if (freq < TUNER_FREQ_MIN_FM/1000 || freq > TUNER_FREQ_MAX_FM/1000) {
> + ret = -EINVAL;
> + goto error;
> + }
> +
> + ret = send_set_req(p, TUNE_FREQ_SELECT, freq, &status);
> + if (ret < 0)
> + goto error ;
> + ret = send_set_req(p, TAKE_REQUEST, 0, &status);
> +
> + set_current_state(TASK_INTERRUPTIBLE);
> + schedule_timeout(HZ/4);
> + if (!p->radio_data.is_radio_streaming) {
> + ret = send_set_req(p, TAKE_REQUEST, 0, &status);
> + ret = send_set_req(p, PLAY_SERVICE,
> + TLG_TUNE_PLAY_SVC_START, &status);
> + p->radio_data.is_radio_streaming = 1;
> + }
> + p->radio_data.fm_freq = frequency;
> +error:
> + mutex_unlock(&p->lock);
> + return ret;
> +}
> +
> +int fm_set_freq(struct file *file, void *priv, struct v4l2_frequency *argp)
> +{
> + struct poseidon *p = file->private_data;
> +
> + p->file_for_stream = file;
> +#ifdef CONFIG_PM
> + p->inode = file->f_dentry->d_inode;
> + p->pm_open = poseidon_fm_open;
> + p->pm_suspend = pm_fm_suspend;
> + p->pm_resume = pm_fm_resume;
> +#endif
> + return set_frequency(p, argp->frequency);
> +}
> +
> +int tlg_fm_vidioc_g_ctrl(struct file *file, void *priv,
> + struct v4l2_control *arg)
> +{
> + return 0;
> +}
> +
> +int tlg_fm_vidioc_exts_ctrl(struct file *file, void *fh,
> + struct v4l2_ext_controls *a)
> +{
> + return 0;
> +}
> +
> +int tlg_fm_vidioc_s_ctrl(struct file *file, void *priv,
> + struct v4l2_control *arg)
> +{
> + return 0;
> +}
> +
> +int tlg_fm_vidioc_queryctrl(struct file *file, void *priv,
> + struct v4l2_queryctrl *arg)
> +{
> + arg->minimum = 0;
> + arg->maximum = 65535;
> + return 0;
> +}
> +
> +static int vidioc_s_tuner(struct file *file, void *priv, struct v4l2_tuner *vt)
> +{
> + return vt->index > 0 ? -EINVAL : 0;
> +}
> +static int vidioc_s_audio(struct file *file, void *priv, struct v4l2_audio *va)
> +{
> + return (va->index != 0) ? -EINVAL : 0;
> +}
> +
> +static int vidioc_g_audio(struct file *file, void *priv, struct v4l2_audio *a)
> +{
> + a->index = 0;
> + a->mode = 0;
> + a->capability = V4L2_AUDCAP_STEREO;
> + strcpy(a->name, "Radio");
> + return 0;
> +}
> +
> +static int vidioc_s_input(struct file *filp, void *priv, u32 i)
> +{
> + return (i != 0) ? -EINVAL : 0;
> +}
> +
> +static int vidioc_g_input(struct file *filp, void *priv, u32 *i)
> +{
> + return (*i != 0) ? -EINVAL : 0;
> +}
> +
> +static const struct v4l2_ioctl_ops poseidon_fm_ioctl_ops = {
> + .vidioc_querycap = vidioc_querycap,
> + .vidioc_g_audio = vidioc_g_audio,
> + .vidioc_s_audio = vidioc_s_audio,
> + .vidioc_g_input = vidioc_g_input,
> + .vidioc_s_input = vidioc_s_input,
> + .vidioc_queryctrl = tlg_fm_vidioc_queryctrl,
> + .vidioc_g_ctrl = tlg_fm_vidioc_g_ctrl,
> + .vidioc_s_ctrl = tlg_fm_vidioc_s_ctrl,
> + .vidioc_s_ext_ctrls = tlg_fm_vidioc_exts_ctrl,
> + .vidioc_s_tuner = vidioc_s_tuner,
> + .vidioc_g_tuner = tlg_fm_vidioc_g_tuner,
> + .vidioc_g_frequency = fm_get_freq,
> + .vidioc_s_frequency = fm_set_freq,
> +};
> +
> +static struct video_device poseidon_fm_template = {
> + .name = "telegent-FM",
> + .fops = &poseidon_fm_fops,
> + .minor = -1,
> + .release = video_device_release,
> + .ioctl_ops = &poseidon_fm_ioctl_ops,
> +};
> +
> +int poseidon_fm_init(struct poseidon *p)
> +{
> + struct video_device *fm_dev;
> +
> + fm_dev = vdev_init(p, &poseidon_fm_template);
> + if (fm_dev == NULL)
> + return -1;
> +
> + if (video_register_device(fm_dev, VFL_TYPE_RADIO, -1) < 0) {
> + video_device_release(fm_dev);
> + return -1;
> + }
> + p->radio_data.fm_dev = fm_dev;
> + return 0;
> +}
> +
> +int poseidon_fm_exit(struct poseidon *p)
> +{
> + if (p->radio_data.fm_dev) {
> + video_unregister_device(p->radio_data.fm_dev);
> + p->radio_data.fm_dev = NULL;
> + }
> + return 0;
> +}
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