From 76cb841cb886eef6b3bee341a2266c76578724ad Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Mon, 6 May 2024 03:02:30 +0200 Subject: Adding upstream version 4.19.249. Signed-off-by: Daniel Baumann --- drivers/media/platform/vivid/vivid-radio-rx.c | 278 ++++++++++++++++++++++++++ 1 file changed, 278 insertions(+) create mode 100644 drivers/media/platform/vivid/vivid-radio-rx.c (limited to 'drivers/media/platform/vivid/vivid-radio-rx.c') diff --git a/drivers/media/platform/vivid/vivid-radio-rx.c b/drivers/media/platform/vivid/vivid-radio-rx.c new file mode 100644 index 000000000..1f86d7d4f --- /dev/null +++ b/drivers/media/platform/vivid/vivid-radio-rx.c @@ -0,0 +1,278 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * vivid-radio-rx.c - radio receiver support functions. + * + * Copyright 2014 Cisco Systems, Inc. and/or its affiliates. All rights reserved. + */ + +#include +#include +#include +#include +#include +#include + +#include +#include +#include + +#include "vivid-core.h" +#include "vivid-ctrls.h" +#include "vivid-radio-common.h" +#include "vivid-rds-gen.h" +#include "vivid-radio-rx.h" + +ssize_t vivid_radio_rx_read(struct file *file, 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; + bool use_alternates; + ktime_t timestamp; + unsigned blk; + int perc; + int i; + + if (dev->radio_rx_rds_controls) + return -EINVAL; + if (size < sizeof(*data)) + return 0; + size = sizeof(*data) * (size / sizeof(*data)); + + if (mutex_lock_interruptible(&dev->mutex)) + return -ERESTARTSYS; + if (dev->radio_rx_rds_owner && + file->private_data != dev->radio_rx_rds_owner) { + mutex_unlock(&dev->mutex); + return -EBUSY; + } + if (dev->radio_rx_rds_owner == NULL) { + vivid_radio_rds_init(dev); + dev->radio_rx_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); + use_alternates = (blk % VIVID_RDS_GEN_BLOCKS) & 1; + + if (dev->radio_rx_rds_last_block == 0 || + dev->radio_rx_rds_use_alternates != use_alternates) { + dev->radio_rx_rds_use_alternates = use_alternates; + /* Re-init the RDS generator */ + vivid_radio_rds_init(dev); + } + if (blk >= dev->radio_rx_rds_last_block + VIVID_RDS_GEN_BLOCKS) + dev->radio_rx_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_rx_rds_last_block || !dev->radio_rx_rds_enabled || + (dev->radio_rds_loop && !(dev->radio_tx_subchans & V4L2_TUNER_SUB_RDS)) || + abs(dev->radio_rx_sig_qual) > 200) { + 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; + } + + /* abs(dev->radio_rx_sig_qual) <= 200, map that to a 0-50% range */ + perc = abs(dev->radio_rx_sig_qual) / 4; + + for (i = 0; i < size && blk > dev->radio_rx_rds_last_block; + dev->radio_rx_rds_last_block++) { + unsigned data_blk = dev->radio_rx_rds_last_block % VIVID_RDS_GEN_BLOCKS; + struct v4l2_rds_data rds = data[data_blk]; + + if (data_blk == 0 && dev->radio_rds_loop) + vivid_radio_rds_init(dev); + if (perc && prandom_u32_max(100) < perc) { + switch (prandom_u32_max(4)) { + case 0: + rds.block |= V4L2_RDS_BLOCK_CORRECTED; + break; + case 1: + rds.block |= V4L2_RDS_BLOCK_INVALID; + break; + case 2: + rds.block |= V4L2_RDS_BLOCK_ERROR; + rds.lsb = prandom_u32_max(256); + rds.msb = prandom_u32_max(256); + break; + case 3: /* Skip block altogether */ + if (i) + continue; + /* + * Must make sure at least one block is + * returned, otherwise the application + * might think that end-of-file occurred. + */ + break; + } + } + if (copy_to_user(buf + i, &rds, sizeof(rds))) { + i = -EFAULT; + break; + } + i += sizeof(rds); + } + mutex_unlock(&dev->mutex); + return i; +} + +__poll_t vivid_radio_rx_poll(struct file *file, struct poll_table_struct *wait) +{ + return EPOLLIN | EPOLLRDNORM | v4l2_ctrl_poll(file, wait); +} + +int vivid_radio_rx_enum_freq_bands(struct file *file, void *fh, struct v4l2_frequency_band *band) +{ + if (band->tuner != 0) + return -EINVAL; + + if (band->index >= TOT_BANDS) + return -EINVAL; + + *band = vivid_radio_bands[band->index]; + return 0; +} + +int vivid_radio_rx_s_hw_freq_seek(struct file *file, void *fh, const struct v4l2_hw_freq_seek *a) +{ + struct vivid_dev *dev = video_drvdata(file); + unsigned low, high; + unsigned freq; + unsigned spacing; + unsigned band; + + if (a->tuner) + return -EINVAL; + if (a->wrap_around && dev->radio_rx_hw_seek_mode == VIVID_HW_SEEK_BOUNDED) + return -EINVAL; + + if (!a->wrap_around && dev->radio_rx_hw_seek_mode == VIVID_HW_SEEK_WRAP) + return -EINVAL; + if (!a->rangelow ^ !a->rangehigh) + return -EINVAL; + + if (file->f_flags & O_NONBLOCK) + return -EWOULDBLOCK; + + if (a->rangelow) { + for (band = 0; band < TOT_BANDS; band++) + if (a->rangelow >= vivid_radio_bands[band].rangelow && + a->rangehigh <= vivid_radio_bands[band].rangehigh) + break; + if (band == TOT_BANDS) + return -EINVAL; + if (!dev->radio_rx_hw_seek_prog_lim && + (a->rangelow != vivid_radio_bands[band].rangelow || + a->rangehigh != vivid_radio_bands[band].rangehigh)) + return -EINVAL; + low = a->rangelow; + high = a->rangehigh; + } else { + for (band = 0; band < TOT_BANDS; band++) + if (dev->radio_rx_freq >= vivid_radio_bands[band].rangelow && + dev->radio_rx_freq <= vivid_radio_bands[band].rangehigh) + break; + if (band == TOT_BANDS) + return -EINVAL; + low = vivid_radio_bands[band].rangelow; + high = vivid_radio_bands[band].rangehigh; + } + spacing = band == BAND_AM ? 1600 : 16000; + freq = clamp(dev->radio_rx_freq, low, high); + + if (a->seek_upward) { + freq = spacing * (freq / spacing) + spacing; + if (freq > high) { + if (!a->wrap_around) + return -ENODATA; + freq = spacing * (low / spacing) + spacing; + if (freq >= dev->radio_rx_freq) + return -ENODATA; + } + } else { + freq = spacing * ((freq + spacing - 1) / spacing) - spacing; + if (freq < low) { + if (!a->wrap_around) + return -ENODATA; + freq = spacing * ((high + spacing - 1) / spacing) - spacing; + if (freq <= dev->radio_rx_freq) + return -ENODATA; + } + } + return 0; +} + +int vivid_radio_rx_g_tuner(struct file *file, void *fh, struct v4l2_tuner *vt) +{ + struct vivid_dev *dev = video_drvdata(file); + int delta = 800; + int sig_qual; + + if (vt->index > 0) + return -EINVAL; + + strlcpy(vt->name, "AM/FM/SW Receiver", sizeof(vt->name)); + vt->capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_STEREO | + V4L2_TUNER_CAP_FREQ_BANDS | V4L2_TUNER_CAP_RDS | + (dev->radio_rx_rds_controls ? + V4L2_TUNER_CAP_RDS_CONTROLS : + V4L2_TUNER_CAP_RDS_BLOCK_IO) | + (dev->radio_rx_hw_seek_prog_lim ? + V4L2_TUNER_CAP_HWSEEK_PROG_LIM : 0); + switch (dev->radio_rx_hw_seek_mode) { + case VIVID_HW_SEEK_BOUNDED: + vt->capability |= V4L2_TUNER_CAP_HWSEEK_BOUNDED; + break; + case VIVID_HW_SEEK_WRAP: + vt->capability |= V4L2_TUNER_CAP_HWSEEK_WRAP; + break; + case VIVID_HW_SEEK_BOTH: + vt->capability |= V4L2_TUNER_CAP_HWSEEK_WRAP | + V4L2_TUNER_CAP_HWSEEK_BOUNDED; + break; + } + vt->rangelow = AM_FREQ_RANGE_LOW; + vt->rangehigh = FM_FREQ_RANGE_HIGH; + sig_qual = dev->radio_rx_sig_qual; + vt->signal = abs(sig_qual) > delta ? 0 : + 0xffff - ((unsigned)abs(sig_qual) * 0xffff) / delta; + vt->afc = sig_qual > delta ? 0 : sig_qual; + if (abs(sig_qual) > delta) + vt->rxsubchans = 0; + else if (dev->radio_rx_freq < FM_FREQ_RANGE_LOW || vt->signal < 0x8000) + vt->rxsubchans = V4L2_TUNER_SUB_MONO; + else if (dev->radio_rds_loop && !(dev->radio_tx_subchans & V4L2_TUNER_SUB_STEREO)) + vt->rxsubchans = V4L2_TUNER_SUB_MONO; + else + vt->rxsubchans = V4L2_TUNER_SUB_STEREO; + if (dev->radio_rx_rds_enabled && + (!dev->radio_rds_loop || (dev->radio_tx_subchans & V4L2_TUNER_SUB_RDS)) && + dev->radio_rx_freq >= FM_FREQ_RANGE_LOW && vt->signal >= 0xc000) + vt->rxsubchans |= V4L2_TUNER_SUB_RDS; + if (dev->radio_rx_rds_controls) + vivid_radio_rds_init(dev); + vt->audmode = dev->radio_rx_audmode; + return 0; +} + +int vivid_radio_rx_s_tuner(struct file *file, void *fh, const struct v4l2_tuner *vt) +{ + struct vivid_dev *dev = video_drvdata(file); + + if (vt->index) + return -EINVAL; + dev->radio_rx_audmode = vt->audmode >= V4L2_TUNER_MODE_STEREO; + return 0; +} -- cgit v1.2.3