aad2fa4c8b
timespec is generally deprecated because of the y2038 overflow. In vivid, the usage is fine, since we are dealing with monotonic timestamps, but we can also simplify the code by going to ktime_t. Using ktime_divns() should be roughly as efficient as the old code, since the constant 64-bit division gets turned into a multiplication on modern platforms, and we save multiple 32-bit divisions that can be expensive e.g. on ARMv7. Tested-by: Hans Verkuil <hans.verkuil@cisco.com> Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
141 lines
4.2 KiB
C
141 lines
4.2 KiB
C
/*
|
|
* vivid-radio-tx.c - radio transmitter support functions.
|
|
*
|
|
* Copyright 2014 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
|
|
*
|
|
* This program is free software; you may redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; version 2 of the License.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
|
|
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
|
|
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
|
|
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
|
|
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
|
|
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
|
|
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
|
* SOFTWARE.
|
|
*/
|
|
|
|
#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;
|
|
}
|
|
|
|
unsigned int vivid_radio_tx_poll(struct file *file, struct poll_table_struct *wait)
|
|
{
|
|
return POLLOUT | POLLWRNORM | 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;
|
|
|
|
strlcpy(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;
|
|
}
|