// SPDX-License-Identifier: GPL-2.0-only
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/*
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* vivid-radio-rx.c - radio receiver support functions.
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*
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* Copyright 2014 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
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*/
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#include <linux/errno.h>
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#include <linux/kernel.h>
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#include <linux/delay.h>
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#include <linux/videodev2.h>
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#include <linux/v4l2-dv-timings.h>
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#include <linux/sched/signal.h>
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#include <media/v4l2-common.h>
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#include <media/v4l2-event.h>
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#include <media/v4l2-dv-timings.h>
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#include "vivid-core.h"
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#include "vivid-ctrls.h"
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#include "vivid-radio-common.h"
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#include "vivid-rds-gen.h"
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#include "vivid-radio-rx.h"
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ssize_t vivid_radio_rx_read(struct file *file, char __user *buf,
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size_t size, loff_t *offset)
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{
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struct vivid_dev *dev = video_drvdata(file);
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struct v4l2_rds_data *data = dev->rds_gen.data;
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bool use_alternates;
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ktime_t timestamp;
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unsigned blk;
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int perc;
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int i;
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if (dev->radio_rx_rds_controls)
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return -EINVAL;
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if (size < sizeof(*data))
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return 0;
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size = sizeof(*data) * (size / sizeof(*data));
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if (mutex_lock_interruptible(&dev->mutex))
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return -ERESTARTSYS;
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if (dev->radio_rx_rds_owner &&
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file->private_data != dev->radio_rx_rds_owner) {
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mutex_unlock(&dev->mutex);
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return -EBUSY;
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}
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if (dev->radio_rx_rds_owner == NULL) {
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vivid_radio_rds_init(dev);
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dev->radio_rx_rds_owner = file->private_data;
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}
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retry:
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timestamp = ktime_sub(ktime_get(), dev->radio_rds_init_time);
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blk = ktime_divns(timestamp, VIVID_RDS_NSEC_PER_BLK);
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use_alternates = (blk % VIVID_RDS_GEN_BLOCKS) & 1;
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if (dev->radio_rx_rds_last_block == 0 ||
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dev->radio_rx_rds_use_alternates != use_alternates) {
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dev->radio_rx_rds_use_alternates = use_alternates;
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/* Re-init the RDS generator */
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vivid_radio_rds_init(dev);
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}
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if (blk >= dev->radio_rx_rds_last_block + VIVID_RDS_GEN_BLOCKS)
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dev->radio_rx_rds_last_block = blk - VIVID_RDS_GEN_BLOCKS + 1;
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/*
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* No data is available if there hasn't been time to get new data,
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* or if the RDS receiver has been disabled, or if we use the data
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* from the RDS transmitter and that RDS transmitter has been disabled,
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* or if the signal quality is too weak.
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*/
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if (blk == dev->radio_rx_rds_last_block || !dev->radio_rx_rds_enabled ||
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(dev->radio_rds_loop && !(dev->radio_tx_subchans & V4L2_TUNER_SUB_RDS)) ||
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abs(dev->radio_rx_sig_qual) > 200) {
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mutex_unlock(&dev->mutex);
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if (file->f_flags & O_NONBLOCK)
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return -EWOULDBLOCK;
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if (msleep_interruptible(20) && signal_pending(current))
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return -EINTR;
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if (mutex_lock_interruptible(&dev->mutex))
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return -ERESTARTSYS;
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goto retry;
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}
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/* abs(dev->radio_rx_sig_qual) <= 200, map that to a 0-50% range */
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perc = abs(dev->radio_rx_sig_qual) / 4;
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for (i = 0; i < size && blk > dev->radio_rx_rds_last_block;
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dev->radio_rx_rds_last_block++) {
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unsigned data_blk = dev->radio_rx_rds_last_block % VIVID_RDS_GEN_BLOCKS;
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struct v4l2_rds_data rds = data[data_blk];
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if (data_blk == 0 && dev->radio_rds_loop)
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vivid_radio_rds_init(dev);
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if (perc && prandom_u32_max(100) < perc) {
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switch (prandom_u32_max(4)) {
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case 0:
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rds.block |= V4L2_RDS_BLOCK_CORRECTED;
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break;
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case 1:
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rds.block |= V4L2_RDS_BLOCK_INVALID;
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break;
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case 2:
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rds.block |= V4L2_RDS_BLOCK_ERROR;
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rds.lsb = prandom_u32_max(256);
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rds.msb = prandom_u32_max(256);
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break;
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case 3: /* Skip block altogether */
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if (i)
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continue;
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/*
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* Must make sure at least one block is
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* returned, otherwise the application
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* might think that end-of-file occurred.
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*/
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break;
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}
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}
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if (copy_to_user(buf + i, &rds, sizeof(rds))) {
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i = -EFAULT;
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break;
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}
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i += sizeof(rds);
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}
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mutex_unlock(&dev->mutex);
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return i;
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}
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__poll_t vivid_radio_rx_poll(struct file *file, struct poll_table_struct *wait)
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{
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return EPOLLIN | EPOLLRDNORM | v4l2_ctrl_poll(file, wait);
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}
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int vivid_radio_rx_enum_freq_bands(struct file *file, void *fh, struct v4l2_frequency_band *band)
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{
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if (band->tuner != 0)
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return -EINVAL;
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if (band->index >= TOT_BANDS)
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return -EINVAL;
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*band = vivid_radio_bands[band->index];
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return 0;
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}
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int vivid_radio_rx_s_hw_freq_seek(struct file *file, void *fh, const struct v4l2_hw_freq_seek *a)
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{
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struct vivid_dev *dev = video_drvdata(file);
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unsigned low, high;
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unsigned freq;
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unsigned spacing;
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unsigned band;
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if (a->tuner)
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return -EINVAL;
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if (a->wrap_around && dev->radio_rx_hw_seek_mode == VIVID_HW_SEEK_BOUNDED)
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return -EINVAL;
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if (!a->wrap_around && dev->radio_rx_hw_seek_mode == VIVID_HW_SEEK_WRAP)
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return -EINVAL;
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if (!a->rangelow ^ !a->rangehigh)
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return -EINVAL;
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if (file->f_flags & O_NONBLOCK)
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return -EWOULDBLOCK;
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if (a->rangelow) {
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for (band = 0; band < TOT_BANDS; band++)
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if (a->rangelow >= vivid_radio_bands[band].rangelow &&
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a->rangehigh <= vivid_radio_bands[band].rangehigh)
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break;
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if (band == TOT_BANDS)
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return -EINVAL;
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if (!dev->radio_rx_hw_seek_prog_lim &&
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(a->rangelow != vivid_radio_bands[band].rangelow ||
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a->rangehigh != vivid_radio_bands[band].rangehigh))
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return -EINVAL;
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low = a->rangelow;
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high = a->rangehigh;
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} else {
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for (band = 0; band < TOT_BANDS; band++)
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if (dev->radio_rx_freq >= vivid_radio_bands[band].rangelow &&
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dev->radio_rx_freq <= vivid_radio_bands[band].rangehigh)
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break;
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if (band == TOT_BANDS)
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return -EINVAL;
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low = vivid_radio_bands[band].rangelow;
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high = vivid_radio_bands[band].rangehigh;
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}
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spacing = band == BAND_AM ? 1600 : 16000;
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freq = clamp(dev->radio_rx_freq, low, high);
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if (a->seek_upward) {
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freq = spacing * (freq / spacing) + spacing;
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if (freq > high) {
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if (!a->wrap_around)
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return -ENODATA;
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freq = spacing * (low / spacing) + spacing;
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if (freq >= dev->radio_rx_freq)
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return -ENODATA;
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}
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} else {
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freq = spacing * ((freq + spacing - 1) / spacing) - spacing;
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if (freq < low) {
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if (!a->wrap_around)
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return -ENODATA;
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freq = spacing * ((high + spacing - 1) / spacing) - spacing;
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if (freq <= dev->radio_rx_freq)
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return -ENODATA;
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}
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}
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return 0;
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}
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int vivid_radio_rx_g_tuner(struct file *file, void *fh, struct v4l2_tuner *vt)
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{
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struct vivid_dev *dev = video_drvdata(file);
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int delta = 800;
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int sig_qual;
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if (vt->index > 0)
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return -EINVAL;
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strscpy(vt->name, "AM/FM/SW Receiver", sizeof(vt->name));
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vt->capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_STEREO |
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V4L2_TUNER_CAP_FREQ_BANDS | V4L2_TUNER_CAP_RDS |
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(dev->radio_rx_rds_controls ?
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V4L2_TUNER_CAP_RDS_CONTROLS :
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V4L2_TUNER_CAP_RDS_BLOCK_IO) |
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(dev->radio_rx_hw_seek_prog_lim ?
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V4L2_TUNER_CAP_HWSEEK_PROG_LIM : 0);
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switch (dev->radio_rx_hw_seek_mode) {
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case VIVID_HW_SEEK_BOUNDED:
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vt->capability |= V4L2_TUNER_CAP_HWSEEK_BOUNDED;
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break;
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case VIVID_HW_SEEK_WRAP:
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vt->capability |= V4L2_TUNER_CAP_HWSEEK_WRAP;
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break;
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case VIVID_HW_SEEK_BOTH:
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vt->capability |= V4L2_TUNER_CAP_HWSEEK_WRAP |
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V4L2_TUNER_CAP_HWSEEK_BOUNDED;
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break;
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}
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vt->rangelow = AM_FREQ_RANGE_LOW;
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vt->rangehigh = FM_FREQ_RANGE_HIGH;
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sig_qual = dev->radio_rx_sig_qual;
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vt->signal = abs(sig_qual) > delta ? 0 :
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0xffff - ((unsigned)abs(sig_qual) * 0xffff) / delta;
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vt->afc = sig_qual > delta ? 0 : sig_qual;
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if (abs(sig_qual) > delta)
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vt->rxsubchans = 0;
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else if (dev->radio_rx_freq < FM_FREQ_RANGE_LOW || vt->signal < 0x8000)
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vt->rxsubchans = V4L2_TUNER_SUB_MONO;
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else if (dev->radio_rds_loop && !(dev->radio_tx_subchans & V4L2_TUNER_SUB_STEREO))
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vt->rxsubchans = V4L2_TUNER_SUB_MONO;
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else
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vt->rxsubchans = V4L2_TUNER_SUB_STEREO;
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if (dev->radio_rx_rds_enabled &&
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(!dev->radio_rds_loop || (dev->radio_tx_subchans & V4L2_TUNER_SUB_RDS)) &&
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dev->radio_rx_freq >= FM_FREQ_RANGE_LOW && vt->signal >= 0xc000)
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vt->rxsubchans |= V4L2_TUNER_SUB_RDS;
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if (dev->radio_rx_rds_controls)
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vivid_radio_rds_init(dev);
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vt->audmode = dev->radio_rx_audmode;
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return 0;
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}
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int vivid_radio_rx_s_tuner(struct file *file, void *fh, const struct v4l2_tuner *vt)
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{
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struct vivid_dev *dev = video_drvdata(file);
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if (vt->index)
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return -EINVAL;
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dev->radio_rx_audmode = vt->audmode >= V4L2_TUNER_MODE_STEREO;
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return 0;
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}
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