// SPDX-License-Identifier: GPL-2.0-only
|
/*
|
* vivid-radio-tx.c - radio transmitter support functions.
|
*
|
* Copyright 2014 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
|
*/
|
|
#include <linux/errno.h>
|
#include <linux/kernel.h>
|
#include <linux/sched/signal.h>
|
#include <linux/delay.h>
|
#include <linux/videodev2.h>
|
#include <linux/v4l2-dv-timings.h>
|
#include <media/v4l2-common.h>
|
#include <media/v4l2-event.h>
|
#include <media/v4l2-dv-timings.h>
|
|
#include "vivid-core.h"
|
#include "vivid-ctrls.h"
|
#include "vivid-radio-common.h"
|
#include "vivid-radio-tx.h"
|
|
ssize_t vivid_radio_tx_write(struct file *file, const char __user *buf,
|
size_t size, loff_t *offset)
|
{
|
struct vivid_dev *dev = video_drvdata(file);
|
struct v4l2_rds_data *data = dev->rds_gen.data;
|
ktime_t timestamp;
|
unsigned blk;
|
int i;
|
|
if (dev->radio_tx_rds_controls)
|
return -EINVAL;
|
|
if (size < sizeof(*data))
|
return -EINVAL;
|
size = sizeof(*data) * (size / sizeof(*data));
|
|
if (mutex_lock_interruptible(&dev->mutex))
|
return -ERESTARTSYS;
|
if (dev->radio_tx_rds_owner &&
|
file->private_data != dev->radio_tx_rds_owner) {
|
mutex_unlock(&dev->mutex);
|
return -EBUSY;
|
}
|
dev->radio_tx_rds_owner = file->private_data;
|
|
retry:
|
timestamp = ktime_sub(ktime_get(), dev->radio_rds_init_time);
|
blk = ktime_divns(timestamp, VIVID_RDS_NSEC_PER_BLK);
|
if (blk - VIVID_RDS_GEN_BLOCKS >= dev->radio_tx_rds_last_block)
|
dev->radio_tx_rds_last_block = blk - VIVID_RDS_GEN_BLOCKS + 1;
|
|
/*
|
* No data is available if there hasn't been time to get new data,
|
* or if the RDS receiver has been disabled, or if we use the data
|
* from the RDS transmitter and that RDS transmitter has been disabled,
|
* or if the signal quality is too weak.
|
*/
|
if (blk == dev->radio_tx_rds_last_block ||
|
!(dev->radio_tx_subchans & V4L2_TUNER_SUB_RDS)) {
|
mutex_unlock(&dev->mutex);
|
if (file->f_flags & O_NONBLOCK)
|
return -EWOULDBLOCK;
|
if (msleep_interruptible(20) && signal_pending(current))
|
return -EINTR;
|
if (mutex_lock_interruptible(&dev->mutex))
|
return -ERESTARTSYS;
|
goto retry;
|
}
|
|
for (i = 0; i < size && blk > dev->radio_tx_rds_last_block;
|
dev->radio_tx_rds_last_block++) {
|
unsigned data_blk = dev->radio_tx_rds_last_block % VIVID_RDS_GEN_BLOCKS;
|
struct v4l2_rds_data rds;
|
|
if (copy_from_user(&rds, buf + i, sizeof(rds))) {
|
i = -EFAULT;
|
break;
|
}
|
i += sizeof(rds);
|
if (!dev->radio_rds_loop)
|
continue;
|
if ((rds.block & V4L2_RDS_BLOCK_MSK) == V4L2_RDS_BLOCK_INVALID ||
|
(rds.block & V4L2_RDS_BLOCK_ERROR))
|
continue;
|
rds.block &= V4L2_RDS_BLOCK_MSK;
|
data[data_blk] = rds;
|
}
|
mutex_unlock(&dev->mutex);
|
return i;
|
}
|
|
__poll_t vivid_radio_tx_poll(struct file *file, struct poll_table_struct *wait)
|
{
|
return EPOLLOUT | EPOLLWRNORM | v4l2_ctrl_poll(file, wait);
|
}
|
|
int vidioc_g_modulator(struct file *file, void *fh, struct v4l2_modulator *a)
|
{
|
struct vivid_dev *dev = video_drvdata(file);
|
|
if (a->index > 0)
|
return -EINVAL;
|
|
strscpy(a->name, "AM/FM/SW Transmitter", sizeof(a->name));
|
a->capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_STEREO |
|
V4L2_TUNER_CAP_FREQ_BANDS | V4L2_TUNER_CAP_RDS |
|
(dev->radio_tx_rds_controls ?
|
V4L2_TUNER_CAP_RDS_CONTROLS :
|
V4L2_TUNER_CAP_RDS_BLOCK_IO);
|
a->rangelow = AM_FREQ_RANGE_LOW;
|
a->rangehigh = FM_FREQ_RANGE_HIGH;
|
a->txsubchans = dev->radio_tx_subchans;
|
return 0;
|
}
|
|
int vidioc_s_modulator(struct file *file, void *fh, const struct v4l2_modulator *a)
|
{
|
struct vivid_dev *dev = video_drvdata(file);
|
|
if (a->index)
|
return -EINVAL;
|
if (a->txsubchans & ~0x13)
|
return -EINVAL;
|
dev->radio_tx_subchans = a->txsubchans;
|
return 0;
|
}
|
