/
avb.c
executable file
·1300 lines (1093 loc) · 35.4 KB
/
avb.c
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/*
* Virtual AVB ALSA sound device
*
* Implementation:
* Copyright (c) by Niklas Wantrupp <niklaswantrupp@web.de>
*
* Based on generic AVB Driver:
* Copyright (c) Indumathi Duraipandian <indu9086@gmail.com>
*
* Updates for out-of-tree compilation and kernel versions > 5.10:
* Thomas Grill <gr@grrrr.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/kthread.h>
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/jiffies.h>
#include <linux/slab.h>
#include <linux/time.h>
#include <linux/timer.h>
#include <linux/wait.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/uio.h>
#include <sound/core.h>
#include <sound/control.h>
#include <sound/pcm.h>
#include <sound/info.h>
#include <sound/initval.h>
#include <sound/hwdep.h>
#include <linux/netdevice.h>
#include <linux/ip.h>
#include <linux/in.h>
#include <linux/delay.h>
#include <linux/un.h>
#include <linux/unistd.h>
#include <linux/ctype.h>
#include <linux/hrtimer.h>
#include <asm/unistd.h>
#include <asm/div64.h>
#include <net/sock.h>
#include <net/tcp.h>
#include <net/inet_connection_sock.h>
#include <net/request_sock.h>
#include "avb.h"
MODULE_AUTHOR("Indumathi Duraipandian <indu9086@gmail.com>");
MODULE_DESCRIPTION("AVB soundcard");
MODULE_LICENSE("GPL");
#define AVB_DEBUG
static int index[SND_AVB_NUM_CARDS] = SNDRV_DEFAULT_IDX;
static char *id[SND_AVB_NUM_CARDS] = SNDRV_DEFAULT_STR;
static bool enable[SND_AVB_NUM_CARDS] = { 1,
[1 ...(SND_AVB_NUM_CARDS - 1)] = 0 };
static int pcm_substreams[SND_AVB_NUM_CARDS] = { 1 };
static int pcm_notify[SND_AVB_NUM_CARDS];
static char *avb_ifname = "eth0";
module_param_array(index, int, NULL, 0444);
MODULE_PARM_DESC(index, "Index value for avb soundcard.");
module_param_array(id, charp, NULL, 0444);
MODULE_PARM_DESC(id, "ID string for avb soundcard.");
module_param_array(enable, bool, NULL, 0444);
MODULE_PARM_DESC(enable, "Enable this avb soundcard.");
module_param_array(pcm_substreams, int, NULL, 0444);
MODULE_PARM_DESC(pcm_substreams, "PCM substreams # (1-8) for avb driver.");
module_param_array(pcm_notify, int, NULL, 0444);
MODULE_PARM_DESC(pcm_notify,
"Break capture when PCM format/rate/channels changes.");
module_param(avb_ifname, charp, 0444);
MODULE_PARM_DESC(avb_ifname, "Network interface to use (default is eth0).");
static struct avb_device avb_device;
static int numcards = 0;
static struct platform_device *avbdevices[SND_AVB_NUM_CARDS];
static int avb_playback_open(struct snd_pcm_substream *substream);
static int avb_playback_close(struct snd_pcm_substream *substream);
static int avb_playback_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params);
static int avb_playback_hw_free(struct snd_pcm_substream *substream);
static int avb_playback_prepare(struct snd_pcm_substream *substream);
static int avb_playback_trigger(struct snd_pcm_substream *substream, int cmd);
static snd_pcm_uframes_t
avb_playback_pointer(struct snd_pcm_substream *substream);
static int avb_playback_copy(struct snd_pcm_substream *substream, int channel,
unsigned long pos, void __user *dst,
unsigned long count);
#ifdef AVB_USE_HIGH_RES_TIMER
enum hrtimer_restart avb_avtp_timer(struct hrtimer *t);
#else
static void avb_avtp_timer(unsigned long arg);
#endif
static int avb_capture_open(struct snd_pcm_substream *substream);
static int avb_capture_close(struct snd_pcm_substream *substream);
static int avb_capture_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params);
static int avb_capture_hw_free(struct snd_pcm_substream *substream);
static int avb_capture_prepare(struct snd_pcm_substream *substream);
static int avb_capture_trigger(struct snd_pcm_substream *substream, int cmd);
static snd_pcm_uframes_t
avb_capture_pointer(struct snd_pcm_substream *substream);
static int avb_capture_copy(struct snd_pcm_substream *substream, int channel,
unsigned long pos, void __user *dst,
unsigned long count);
static int avb_avtp_listen(struct avb_card *card);
static void avb_wq_fn(struct work_struct *work);
DECLARE_DELAYED_WORK(avb_wq, avb_wq_fn);
static int avb_pcm_new(struct avb_card *avbc, int device, int substreams);
#ifdef CONFIG_PM_SLEEP
static int avb_suspend(struct device *pdev);
static int avb_resume(struct device *pdev);
#endif
static int avb_probe(struct platform_device *devptr);
static int avb_remove(struct platform_device *devptr);
static void avb_remove_all(void);
static int __init alsa_avb_init(void);
static void __exit alsa_avb_exit(void);
static SIMPLE_DEV_PM_OPS(avb_pm, avb_suspend, avb_resume);
static struct platform_driver avb_driver = {
.probe = avb_probe,
.remove = avb_remove,
.driver = {
.name = SND_AVB_DRIVER,
.pm = AVB_PM_OPS,
},
};
static struct snd_pcm_ops avb_playback_ops = {
.open = avb_playback_open,
.close = avb_playback_close,
.ioctl = snd_pcm_lib_ioctl,
.hw_params = avb_playback_hw_params,
.hw_free = avb_playback_hw_free,
.prepare = avb_playback_prepare,
.trigger = avb_playback_trigger,
.pointer = avb_playback_pointer,
.copy_user = avb_playback_copy
};
static struct snd_pcm_ops avb_capture_ops = {
.open = avb_capture_open,
.close = avb_capture_close,
.ioctl = snd_pcm_lib_ioctl,
.hw_params = avb_capture_hw_params,
.hw_free = avb_capture_hw_free,
.prepare = avb_capture_prepare,
.trigger = avb_capture_trigger,
.pointer = avb_capture_pointer,
.copy_user = avb_capture_copy
};
static struct snd_pcm_hardware avb_playback_hw = {
.info = (SNDRV_PCM_INFO_INTERLEAVED |
SNDRV_PCM_INFO_BLOCK_TRANSFER),
.formats = SNDRV_PCM_FMTBIT_S16_LE,
.rates = SNDRV_PCM_RATE_8000_192000,
.rate_min = 8000,
.rate_max = 192000,
.channels_min = 1,
.channels_max = 8,
.buffer_bytes_max = 131072,
.period_bytes_min = 16384,
.period_bytes_max = 131072,
.periods_min = 2,
.periods_max = 4,
};
static struct snd_pcm_hardware avb_capture_hw = {
.info = (SNDRV_PCM_INFO_INTERLEAVED |
SNDRV_PCM_INFO_BLOCK_TRANSFER),
.formats = SNDRV_PCM_FMTBIT_S16_LE,
.rates = SNDRV_PCM_RATE_8000_192000,
.rate_min = 8000,
.rate_max = 192000,
.channels_min = 1,
.channels_max = 8,
.buffer_bytes_max = 131072,
.period_bytes_min = 16384,
.period_bytes_max = 131072,
.periods_min = 2,
.periods_max = 4,
};
static struct work_data *avb_init_and_queue_work(int work_id, void *wdata,
int delay)
{
struct work_data *wd;
wd = (struct work_data *)kmalloc(sizeof(struct work_data), GFP_KERNEL);
if (wd == NULL) {
avb_log(AVB_KERN_ERR,
KERN_ERR
"avb_init_and_queue_work work_data allocation failed for work %d",
work_id);
return NULL;
}
wd->dw.data = wdata;
wd->delayed_work_id = work_id;
INIT_DELAYED_WORK((struct delayed_work *)wd, avb_wq_fn); // this is probably superfluous
// we have one common queue
queue_delayed_work(avb_device.wq, (struct delayed_work *)wd, delay);
return wd;
}
static int avb_playback_open(struct snd_pcm_substream *substream)
{
avb_log(AVB_KERN_NOT, KERN_NOTICE "avb_playback_open");
substream->runtime->hw = avb_playback_hw;
return 0;
}
static int avb_playback_close(struct snd_pcm_substream *substream)
{
avb_log(AVB_KERN_NOT, KERN_NOTICE "avb_playback_close");
return 0;
}
static int avb_playback_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *hw_params)
{
struct avb_card *avb_card = snd_pcm_substream_chip(substream);
avb_log(AVB_KERN_NOT,
KERN_NOTICE "avb_playback_hw_params numbytes:%d sr:%d",
params_buffer_bytes(hw_params), params_rate(hw_params));
avb_card->tx.substream = substream;
avb_card->tx.st = 0;
avb_card->tx.sr = params_rate(hw_params);
avb_card->tx.hw_idx = 0;
avb_card->tx.seq_no = 0;
avb_card->tx.hwnw_idx = 0;
avb_card->tx.fill_size = 0;
avb_card->tx.last_timer_ts = jiffies;
avb_card->tx.socket_count = 0;
avb_card->tx.pending_tx_frames = 0;
avb_card->tx.num_bytes_consumed = 0;
avb_card->tx.period_size = params_period_size(hw_params);
avb_card->tx.buffer_size = params_buffer_bytes(hw_params);
avb_card->tx.frame_count = params_buffer_size(hw_params);
avb_card->tx.frame_size =
params_buffer_bytes(hw_params) / params_buffer_size(hw_params);
avb_avtp_aaf_header_init(&avb_card->sd.tx_buf[0], substream, hw_params);
#ifdef AVB_USE_HIGH_RES_TIMER
hrtimer_init((struct hrtimer *)&avb_device.txTimer, CLOCK_MONOTONIC,
HRTIMER_MODE_REL);
avb_device.txTimer.timer.function = &avb_avtp_timer;
avb_device.txTimer.card = avb_card;
#else
init_timer(&avb_device.txTimer);
avb_device.txTimer.data = (unsigned long)avb_card;
avb_device.txTimer.function = avb_avtp_timer;
avb_device.txTimer.expires = jiffies + 1;
add_timer(&avb_device.txTimer);
#endif
memset(&avb_device.tx_ts[0], 0, (sizeof(int) * AVB_MAX_TS_SLOTS));
avb_device.tx_idx = 0;
avb_card->tx.tmp_buf = kmalloc(avb_card->tx.buffer_size, GFP_KERNEL);
return 0;
}
static int avb_playback_hw_free(struct snd_pcm_substream *substream)
{
struct avb_card *avb_card = snd_pcm_substream_chip(substream);
avb_log(AVB_KERN_NOT, KERN_NOTICE "avb_playback_hw_free");
#ifdef AVB_USE_HIGH_RES_TIMER
hrtimer_try_to_cancel((struct hrtimer *)&avb_device.txTimer);
#else
del_timer(&avb_device.txTimer);
#endif
kfree(avb_card->tx.tmp_buf);
return 0;
}
static int avb_playback_prepare(struct snd_pcm_substream *substream)
{
return 0;
}
static int avb_playback_trigger(struct snd_pcm_substream *substream, int cmd)
{
ktime_t kt;
int ret = 0;
int avtp_max_frames_per_packet = 0;
struct avb_card *avb_card = snd_pcm_substream_chip(substream);
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
avb_card->tx.st = 1;
avb_log(AVB_KERN_NOT,
KERN_NOTICE "avb_playback_trigger: Start @ %lu",
jiffies);
#ifdef AVB_USE_HIGH_RES_TIMER
avtp_max_frames_per_packet =
((ETH_DATA_LEN - sizeof(struct avt_pdu_aaf_pcm_hdr)) /
avb_card->tx.frame_size);
avb_card->tx.timer_val =
((avtp_max_frames_per_packet * 1000000u) /
(avb_card->tx.sr / 1000));
kt = ktime_set(0, avb_card->tx.timer_val);
hrtimer_start((struct hrtimer *)&avb_device.txTimer, kt,
HRTIMER_MODE_REL);
#else
avb_card->tx.start_ts = jiffies;
if ((avb_card->tx.pending_tx_frames > 0) &&
(!timer_pending(&avb_device.txTimer))) {
avb_device.txTimer.expires = jiffies + 1;
add_timer(&avb_device.txTimer);
}
#endif
break;
case SNDRV_PCM_TRIGGER_STOP:
avb_log(AVB_KERN_NOT,
KERN_NOTICE "avb_playback_trigger: Stop @ %lu",
jiffies);
avb_card->tx.st = 0;
#ifdef AVB_USE_HIGH_RES_TIMER
hrtimer_try_to_cancel((struct hrtimer *)&avb_device.txTimer);
#endif
break;
default:
avb_log(AVB_KERN_WARN,
KERN_WARNING "avb_playback_trigger: Unknown");
ret = -EINVAL;
}
return ret;
}
static snd_pcm_uframes_t
avb_playback_pointer(struct snd_pcm_substream *substream)
{
struct avb_card *avb_card = snd_pcm_substream_chip(substream);
avb_log(AVB_KERN_INFO,
KERN_INFO
"avb_playback_pointer hw_idx:%lu numBytes:%lu, time: %u us",
avb_card->tx.hw_idx, avb_card->tx.num_bytes_consumed,
jiffies_to_usecs(jiffies - avb_card->tx.start_ts));
return avb_card->tx.hw_idx;
}
static int avb_playback_copy(struct snd_pcm_substream *substream, int channel,
unsigned long pos, void __user *dst,
unsigned long count)
{
int err = 0;
struct avb_card *avb_card = snd_pcm_substream_chip(substream);
count = bytes_to_frames(substream->runtime, count);
pos = bytes_to_frames(substream->runtime, pos);
avb_log(AVB_KERN_INFO,
KERN_INFO "avb_playback_copy: ch:%d, pos: %ld, count: %lu",
channel, pos, count);
if ((err = copy_from_user(
&avb_card->tx.tmp_buf[(pos * avb_card->tx.frame_size)],
dst, (count * avb_card->tx.frame_size))) != 0) {
avb_log(AVB_KERN_WARN,
KERN_WARNING
"avb_playback_copy copy from user fails: %d \n",
err);
return -1;
}
avb_card->tx.pending_tx_frames += count;
avb_card->tx.num_bytes_consumed +=
(count * (substream->runtime->frame_bits / 8));
#ifndef AVB_USE_HIGH_RES_TIMER
if (avb_card->tx.st == 1) {
avb_avtp_timer((unsigned long)avb_card);
}
if ((avb_card->tx.pending_tx_frames > 0) &&
(!timer_pending(&avb_device.txTimer) && (avb_card->tx.st == 1))) {
avb_device.txTimer.expires = jiffies + 1;
add_timer(&avb_device.txTimer);
}
#endif
return 0;
}
#ifdef AVB_USE_HIGH_RES_TIMER
enum hrtimer_restart avb_avtp_timer(struct hrtimer *t)
#else
static void avb_avtp_timer(unsigned long arg)
#endif
{
ktime_t kt;
int i = 0;
int err = 0;
int tx_size = 0;
snd_pcm_uframes_t bytes_avai = 0;
snd_pcm_uframes_t bytes_to_copy = 0;
snd_pcm_uframes_t frames_to_copy = 0;
snd_pcm_uframes_t avtp_frames_per_packet = 0;
snd_pcm_uframes_t avtp_max_frames_per_packet = 0;
enum hrtimer_restart hr_res = HRTIMER_NORESTART;
#ifdef AVB_USE_HIGH_RES_TIMER
struct avb_card *avb_card = ((struct avb_hrtimer *)t)->card;
#else
struct avb_card *avb_card = (struct avb_card *)arg;
#endif
struct avt_pdu_aaf_pcm_hdr *hdr =
(struct avt_pdu_aaf_pcm_hdr *)&avb_card->sd
.tx_buf[sizeof(struct ethhdr)];
#ifndef AVB_USE_HIGH_RES_TIMER
unsigned long int numJiffies =
((jiffies > avb_card->tx.last_timer_ts) ?
(jiffies - avb_card->tx.last_timer_ts) :
(1));
snd_pcm_uframes_t frameCount = ((avb_card->tx.sr * numJiffies) / HZ);
#endif
avtp_max_frames_per_packet =
((ETH_DATA_LEN - sizeof(struct avt_pdu_aaf_pcm_hdr)) /
avb_card->tx.frame_size);
#ifdef AVB_USE_HIGH_RES_TIMER
avb_card->tx.accum_frame_count += avtp_max_frames_per_packet;
avtp_frames_per_packet = avtp_max_frames_per_packet;
kt = ktime_set(0, avb_card->tx.timer_val);
avb_log(AVB_KERN_INFO,
KERN_INFO
"avb_avtp_timer mfppk: %lu, fppk: %lu, frSz: %lu, sr: %lu, time: %lu",
avtp_max_frames_per_packet, avtp_frames_per_packet,
avb_card->tx.frame_size, avb_card->tx.sr,
avb_card->tx.timer_val);
#else
avb_card->tx.accum_frame_count += frameCount;
avtp_frames_per_packet = (avb_card->tx.sr / HZ);
avtp_frames_per_packet =
((avtp_frames_per_packet > avtp_max_frames_per_packet) ?
(avtp_max_frames_per_packet) :
(avtp_frames_per_packet));
avb_log(AVB_KERN_INFO,
KERN_INFO
"avb_avtp_timer ct: %lu, mfppk: %lu, fppk: %lu, frSz: %lu, sr: %lu, HZ: %lu",
frameCount, avtp_max_frames_per_packet, avtp_frames_per_packet,
avb_card->tx.frame_size, avb_card->tx.sr, HZ);
#endif
while (((avb_card->tx.accum_frame_count >= avtp_frames_per_packet) ||
(avb_card->tx.pending_tx_frames <= avtp_frames_per_packet)) &&
#ifdef AVB_USE_HIGH_RES_TIMER
((avb_card->tx.pending_tx_frames > 0) && (i < 1))) {
#else
((avb_card->tx.pending_tx_frames > 0) && (frameCount > 0) &&
(i < 32))) {
#endif
i++; /* Just as a failsafe to quit loop */
avb_card->tx.seq_no++;
hdr->h.f.seq_no = avb_card->tx.seq_no;
tx_size = sizeof(struct ethhdr) +
sizeof(struct avt_pdu_aaf_pcm_hdr);
frames_to_copy = ((avb_card->tx.pending_tx_frames >
avtp_frames_per_packet) ?
(avtp_frames_per_packet) :
(avb_card->tx.pending_tx_frames));
bytes_to_copy = (frames_to_copy * avb_card->tx.frame_size);
bytes_avai = ((avb_card->tx.frame_count - avb_card->tx.hw_idx) *
avb_card->tx.frame_size);
bytes_avai = ((bytes_avai >= bytes_to_copy) ? (bytes_to_copy) :
(bytes_avai));
memcpy(&avb_card->sd.tx_buf[tx_size],
&avb_card->tx.tmp_buf[(avb_card->tx.hw_idx *
avb_card->tx.frame_size)],
bytes_avai);
if (bytes_avai < bytes_to_copy) {
memcpy(&avb_card->sd.tx_buf[tx_size + bytes_avai],
&avb_card->tx.tmp_buf[0],
(bytes_to_copy - bytes_avai));
}
hdr->h.f.avtp_ts = avb_device.tx_ts[(
(avb_card->tx.hwnw_idx / avb_card->tx.period_size) %
AVB_MAX_TS_SLOTS)];
hdr->h.f.stream_data_len = bytes_to_copy;
tx_size += bytes_to_copy;
avb_card->sd.tx_iov.iov_base = avb_card->sd.tx_buf;
avb_card->sd.tx_iov.iov_len = tx_size;
#if LINUX_VERSION_CODE < KERNEL_VERSION(5,1,0)
iov_iter_init(&avb_card->sd.tx_msg_hdr.msg_iter, WRITE,
&avb_card->sd.tx_iov, 1, tx_size);
if ((err = sock_sendmsg(avb_card->sd.sock,
&avb_card->sd.tx_msg_hdr)) <= 0)
#else
if ((err = kernel_sendmsg(avb_card->sd.sock,
&avb_card->sd.tx_msg_hdr,
(struct kvec *)&avb_card->sd.tx_iov, 1, tx_size)) <= 0)
#endif
{
avb_log(AVB_KERN_WARN,
KERN_WARNING
"avb_avtp_timer Socket transmission fails %d \n",
err);
goto end;
}
avb_card->tx.accum_frame_count =
((avb_card->tx.accum_frame_count > frames_to_copy) ?
(avb_card->tx.accum_frame_count -
frames_to_copy) :
(0));
avb_card->tx.hw_idx += frames_to_copy;
avb_card->tx.hwnw_idx += frames_to_copy;
avb_card->tx.fill_size += frames_to_copy;
avb_card->tx.hw_idx =
((avb_card->tx.hw_idx < avb_card->tx.frame_count) ?
(avb_card->tx.hw_idx) :
(avb_card->tx.hw_idx %
avb_card->tx.frame_count));
avb_card->tx.pending_tx_frames -= frames_to_copy;
avb_log(AVB_KERN_INFO,
KERN_INFO
"avb_avtp_timer seq_no:%d, hw_idx: %lu, afrCt: %lu, penFrs:%lu, filSz:%lu",
hdr->h.f.seq_no, avb_card->tx.hw_idx,
avb_card->tx.accum_frame_count,
avb_card->tx.pending_tx_frames, avb_card->tx.fill_size);
if (avb_card->tx.fill_size >= avb_card->tx.period_size) {
avb_card->tx.fill_size %= avb_card->tx.period_size;
snd_pcm_period_elapsed(avb_card->tx.substream);
}
}
end:
#ifdef AVB_USE_HIGH_RES_TIMER
if (avb_card->tx.st == 1) {
hrtimer_forward_now(t, kt);
hr_res = HRTIMER_RESTART;
}
return hr_res;
#else
if ((avb_card->tx.pending_tx_frames > 0) &&
(!timer_pending(&avb_device.txTimer))) {
avb_device.txTimer.expires = jiffies + 1;
add_timer(&avb_device.txTimer);
}
avb_card->tx.last_timer_ts = jiffies;
#endif
}
static int avb_capture_open(struct snd_pcm_substream *substream)
{
avb_log(AVB_KERN_NOT, KERN_NOTICE "avb_capture_open");
substream->runtime->hw = avb_capture_hw;
return 0;
}
static int avb_capture_close(struct snd_pcm_substream *substream)
{
avb_log(AVB_KERN_NOT, KERN_NOTICE "avb_capture_close");
return 0;
}
static int avb_capture_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *hw_params)
{
struct avb_card *avb_card = snd_pcm_substream_chip(substream);
avb_card->rx.substream = substream;
avb_card->rx.hw_idx = 0;
avb_card->rx.seq_no = 0;
avb_card->rx.hwnw_idx = 0;
avb_card->rx.fill_size = 0;
avb_card->rx.prev_hw_idx = 0;
avb_card->rx.socket_count = 0;
avb_card->rx.num_bytes_consumed = 0;
avb_card->rx.period_size = params_period_size(hw_params);
avb_card->rx.buffer_size = params_buffer_bytes(hw_params);
avb_card->rx.frame_count = params_buffer_size(hw_params);
avb_card->rx.frame_size =
params_buffer_bytes(hw_params) / params_buffer_size(hw_params);
avb_log(AVB_KERN_NOT,
KERN_NOTICE
"avb_capture_hw_params buffer_size:%lu frame_size:%lu",
avb_card->rx.buffer_size, avb_card->rx.frame_size);
memset(&avb_device.rx_ts[0], 0, (sizeof(int) * AVB_MAX_TS_SLOTS));
avb_device.rx_idx = 0;
avb_device.avtpwd = avb_init_and_queue_work(AVB_DELAY_WORK_AVTP,
(void *)avb_card, 1);
avb_card->rx.tmp_buf = kmalloc(avb_card->rx.buffer_size, GFP_KERNEL);
return 0;
}
static int avb_capture_hw_free(struct snd_pcm_substream *substream)
{
struct avb_card *avb_card = snd_pcm_substream_chip(substream);
avb_log(AVB_KERN_NOT, KERN_NOTICE "avb_capture_hw_free");
if (avb_device.avtpwd != NULL) {
cancel_delayed_work((struct delayed_work *)avb_device.avtpwd);
kfree(avb_device.avtpwd);
avb_device.avtpwd = NULL;
}
kfree(avb_card->rx.tmp_buf);
return 0;
}
static int avb_capture_prepare(struct snd_pcm_substream *substream)
{
return 0;
}
static int avb_capture_trigger(struct snd_pcm_substream *substream, int cmd)
{
int ret = 0;
struct avb_card *avb_card = snd_pcm_substream_chip(substream);
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
avb_log(AVB_KERN_NOT,
KERN_NOTICE "avb_capture_trigger: Start @ %lu",
jiffies);
avb_card->rx.start_ts = jiffies;
break;
case SNDRV_PCM_TRIGGER_STOP:
avb_log(AVB_KERN_NOT, KERN_NOTICE "avb_capture_trigger: Stop");
break;
default:
avb_log(AVB_KERN_WARN,
KERN_WARNING "avb_capture_trigger: Unknown");
ret = -EINVAL;
}
return ret;
}
static snd_pcm_uframes_t
avb_capture_pointer(struct snd_pcm_substream *substream)
{
struct avb_card *avb_card = snd_pcm_substream_chip(substream);
avb_log(AVB_KERN_INFO,
KERN_INFO "avb_capture_pointer hw_idx:%lu numBytes:%lu",
avb_card->rx.hw_idx, avb_card->rx.num_bytes_consumed);
return avb_card->rx.hw_idx;
}
static int avb_capture_copy(struct snd_pcm_substream *substream, int channel,
unsigned long pos, void __user *dst,
unsigned long count)
{
char *src_buf;
int copyres = 0;
struct avb_card *avb_card = snd_pcm_substream_chip(substream);
pos = bytes_to_frames(substream->runtime, pos);
count = bytes_to_frames(substream->runtime, count);
src_buf = (char *)&avb_card->rx.tmp_buf[pos * avb_card->rx.frame_size];
copyres = copy_to_user(dst, src_buf, (count * avb_card->rx.frame_size));
avb_log(AVB_KERN_INFO,
KERN_INFO "avb_capture_copy: ch:%d, pos: %ld, ct: %ld, res: %d",
channel, pos, count, copyres);
// TODO: Check if frames to bytes is needed
avb_card->rx.num_bytes_consumed += frames_to_bytes(
substream->runtime, count * avb_card->rx.frame_size);
return count;
}
static int avb_avtp_listen(struct avb_card *avb_card)
{
int err = 0;
char *src_buf;
char *dest_buf;
int rx_off = 0;
int rx_size = 0;
int nrx_size = 0;
int avai_size = 0;
int rx_frames = 0;
int nrx_frames = 0;
int next_seq_no = 0;
int skipped_packets = 0;
#if LINUX_VERSION_CODE < KERNEL_VERSION(5,4,0)
mm_segment_t oldfs;
#endif
snd_pcm_uframes_t hw_idx = 0;
struct kvec vec;
struct avt_pdu_aaf_pcm_hdr *hdr =
(struct avt_pdu_aaf_pcm_hdr *)&avb_card->sd
.rx_buf[sizeof(struct ethhdr)];
memset(avb_card->sd.rx_buf, 0, AVB_MAX_ETH_FRAME_SIZE);
avb_card->sd.rx_iov.iov_base = avb_card->sd.rx_buf;
avb_card->sd.rx_iov.iov_len = AVB_MAX_ETH_FRAME_SIZE;
iov_iter_init(&avb_card->sd.rx_msg_hdr.msg_iter, READ,
&avb_card->sd.rx_iov, 1, AVB_MAX_ETH_FRAME_SIZE);
vec.iov_len = AVB_MAX_ETH_FRAME_SIZE;
vec.iov_base = avb_card->sd.rx_buf;
#if LINUX_VERSION_CODE < KERNEL_VERSION(5,0,0)
oldfs = get_fs();
set_fs(get_ds());
#elif LINUX_VERSION_CODE < KERNEL_VERSION(5,4,0)
oldfs = get_fs();
set_fs(KERNEL_DS);
#else
// code of kernel_recvmsg in kernel 5.4 contains get_fs –
// hopefully, later versions have other security mechanisms....
#endif
err = kernel_recvmsg(avb_card->sd.sock, &avb_card->sd.rx_msg_hdr, &vec,
1, AVB_MAX_ETH_FRAME_SIZE, MSG_DONTWAIT);
#if LINUX_VERSION_CODE < KERNEL_VERSION(5,4,0)
set_fs(oldfs);
#endif
if (err > 0) {
avb_card->rx.socket_count++;
rx_off = sizeof(struct ethhdr) +
sizeof(struct avt_pdu_aaf_pcm_hdr);
src_buf = (char *)&avb_card->sd.rx_buf[rx_off];
rx_size = hdr->h.f.stream_data_len;
rx_frames = (rx_size / avb_card->rx.frame_size);
avb_device.rx_ts[(
(avb_card->rx.hwnw_idx / avb_card->rx.period_size) %
AVB_MAX_TS_SLOTS)] = hdr->h.f.avtp_ts;
next_seq_no = (avb_card->rx.seq_no + 1) % 256;
if (next_seq_no != hdr->h.f.seq_no) {
avb_log(AVB_KERN_INFO,
KERN_ERR
"avb_listen missing frames from %d to %d \n",
avb_card->rx.seq_no, hdr->h.f.seq_no);
skipped_packets =
((hdr->h.f.seq_no >= avb_card->rx.seq_no) ?
(hdr->h.f.seq_no -
avb_card->rx.seq_no) :
((hdr->h.f.seq_no + 255) -
avb_card->rx.seq_no));
nrx_frames = (skipped_packets * rx_frames);
nrx_size = nrx_frames * avb_card->rx.frame_size;
avb_log(AVB_KERN_INFO,
KERN_INFO
"avb_listen idx: %ld nrsz: %d, nrf: %d \n",
avb_card->rx.hw_idx, nrx_size, nrx_frames);
avai_size = ((avb_card->rx.frame_count -
avb_card->rx.hw_idx) *
avb_card->rx.frame_size);
avai_size = ((avai_size < nrx_size) ? (avai_size) :
(nrx_size));
dest_buf = (char *)&avb_card->rx
.tmp_buf[avb_card->rx.hw_idx *
avb_card->rx.frame_size];
memset(dest_buf, 0, avai_size);
if (avai_size < nrx_size) {
dest_buf = (char *)&avb_card->rx.tmp_buf[0];
memset(dest_buf, 0, (nrx_size - avai_size));
}
hw_idx = ((avb_card->rx.hw_idx + nrx_frames) %
(avb_card->rx.frame_count));
rx_frames = rx_frames + nrx_frames;
} else {
hw_idx = avb_card->rx.hw_idx;
}
avb_log(AVB_KERN_INFO,
KERN_INFO
"avb_listen (%d) seq: %d, idx: %ld, sz: %d, ts: %u, rf: %d \n",
avb_card->rx.socket_count, hdr->h.f.seq_no, hw_idx,
rx_size, hdr->h.f.avtp_ts, rx_frames);
avb_card->rx.seq_no = hdr->h.f.seq_no;
avai_size = ((avb_card->rx.frame_count - hw_idx) *
avb_card->rx.frame_size);
avai_size = ((avai_size < rx_size) ? (avai_size) : (rx_size));
dest_buf = (char *)&avb_card->rx
.tmp_buf[hw_idx * avb_card->rx.frame_size];
memcpy(dest_buf, src_buf, avai_size);
if (avai_size < rx_size) {
dest_buf = (char *)&avb_card->rx.tmp_buf[0];
memcpy(dest_buf, &src_buf[avai_size],
(rx_size - avai_size));
}
} else {
if (err != -11)
avb_log(AVB_KERN_WARN,
KERN_WARNING
"avb_avtp_listen Socket reception fails %d \n",
err);
return 0;
}
return rx_frames;
}
static void avb_wq_fn(struct work_struct *work)
{
int err = 0;
int rx_count = 0;
int fill_size = 0;
int rx_frames = -1;
int rx_loop_count = 0;
struct work_data *wd = (struct work_data *)work;
if (wd->delayed_work_id == AVB_DELAY_WORK_MSRP) {
if (!wd->dw.msrp->initialized)
wd->dw.msrp->initialized = avb_msrp_init(avb_ifname, wd->dw.msrp);
if (!wd->dw.msrp->initialized) {
queue_delayed_work(
avb_device.wq,
(struct delayed_work *)avb_device.msrpwd,
10000);
} else {
if (wd->dw.msrp->started) {
do {
err = avb_msrp_listen(wd->dw.msrp);
rx_count += ((err > 0) ? (1) : (0));
} while (err > 0);
if (rx_count == 0) {
if ((wd->dw.msrp->tx_state ==
MSRP_DECLARATION_STATE_NONE) ||
(wd->dw.msrp->tx_state ==
MSRP_DECLARATION_STATE_READY)) {
avb_msrp_talkerdeclarations(
wd->dw.msrp, true,
wd->dw.msrp->tx_state);
}
} else {
if ((wd->dw.msrp->tx_state ==
MSRP_DECLARATION_STATE_NONE) ||
(wd->dw.msrp->tx_state ==
MSRP_DECLARATION_STATE_UNKNOWN)) {
avb_msrp_talkerdeclarations(
wd->dw.msrp, true,
wd->dw.msrp->tx_state);
}
if ((wd->dw.msrp->rx_state ==
MSRP_DECLARATION_STATE_NONE) ||
(wd->dw.msrp->rx_state ==
MSRP_DECLARATION_STATE_READY)) {
avb_msrp_listenerdeclarations(
wd->dw.msrp, true,
wd->dw.msrp->rx_state);
}
wd->dw.msrp->tx_state =
((wd->dw.msrp->tx_state ==
MSRP_DECLARATION_STATE_UNKNOWN) ?
(MSRP_DECLARATION_STATE_NONE) :
(wd->dw.msrp
->tx_state));
wd->dw.msrp->rx_state =
((wd->dw.msrp->rx_state ==
MSRP_DECLARATION_STATE_UNKNOWN) ?
(MSRP_DECLARATION_STATE_NONE) :
(wd->dw.msrp
->rx_state));
}
}
avb_msrp_domaindeclarations(wd->dw.msrp);
queue_delayed_work(
avb_device.wq,
(struct delayed_work *)avb_device.msrpwd,
msecs_to_jiffies(2000));
}
} else if (wd->delayed_work_id == AVB_DELAY_WORK_AVDECC) {
if (!wd->dw.avdecc->initialized)
wd->dw.avdecc->initialized =
avb_avdecc_init(avb_ifname, wd->dw.avdecc);
if (!wd->dw.avdecc->initialized) {
queue_delayed_work(
avb_device.wq,
(struct delayed_work *)avb_device.avdeccwd,
10000);
} else {
if (wd->dw.avdecc->last_ADP_adv_jiffy == 0)
avb_adp_discover(wd->dw.avdecc);
if (((jiffies - wd->dw.avdecc->last_ADP_adv_jiffy) >=
2000) ||
(wd->dw.avdecc->last_ADP_adv_jiffy == 0)) {
avb_adp_advertise(wd->dw.avdecc);
avb_maap_announce(wd->dw.avdecc);
wd->dw.avdecc->last_ADP_adv_jiffy = jiffies;
}
avb_avdecc_listen_and_respond(wd->dw.avdecc,
&avb_device.msrp);
queue_delayed_work(
avb_device.wq,
(struct delayed_work *)avb_device.avdeccwd, 1);
}
} else if (wd->delayed_work_id == AVB_DELAY_WORK_AVTP) {
memcpy(&avb_device.card, wd->dw.card, sizeof(struct avb_card));
do {
rx_frames = avb_avtp_listen(&avb_device.card);
if (rx_frames > 0) {
avb_device.card.rx.hw_idx += rx_frames;
avb_device.card.rx.hwnw_idx += rx_frames;
avb_device.card.rx.hw_idx %=
avb_device.card.rx.frame_count;
if (avb_device.card.rx.hw_idx <
avb_device.card.rx.prev_hw_idx)
fill_size =
avb_device.card.rx.frame_count +
avb_device.card.rx.prev_hw_idx -
avb_device.card.rx.hw_idx;
else
fill_size =
avb_device.card.rx.hw_idx -