// SPDX-License-Identifier: GPL-2.0-only
/*
* oxfw_stream.c - a part of driver for OXFW970/971 based devices
*
* Copyright (c) 2014 Takashi Sakamoto
*/
#include "oxfw.h"
#include <linux/delay.h>
#define AVC_GENERIC_FRAME_MAXIMUM_BYTES 512
#define READY_TIMEOUT_MS 600
/*
* According to datasheet of Oxford Semiconductor:
* OXFW970: 32.0/44.1/48.0/96.0 Khz, 8 audio channels I/O
* OXFW971: 32.0/44.1/48.0/88.2/96.0/192.0 kHz, 16 audio channels I/O, MIDI I/O
*/
static const unsigned int oxfw_rate_table[] = {
[0] = 32000,
[1] = 44100,
[2] = 48000,
[3] = 88200,
[4] = 96000,
[5] = 192000,
};
/*
* See Table 5.7 – Sampling frequency for Multi-bit Audio
* in AV/C Stream Format Information Specification 1.1 (Apr 2005, 1394TA)
*/
static const unsigned int avc_stream_rate_table[] = {
[0] = 0x02,
[1] = 0x03,
[2] = 0x04,
[3] = 0x0a,
[4] = 0x05,
[5] = 0x07,
};
static int set_rate(struct snd_oxfw *oxfw, unsigned int rate)
{
int err;
err = avc_general_set_sig_fmt(oxfw->unit, rate,
AVC_GENERAL_PLUG_DIR_IN, 0);
if (err < 0)
goto end;
if (oxfw->has_output)
err = avc_general_set_sig_fmt(oxfw->unit, rate,
AVC_GENERAL_PLUG_DIR_OUT, 0);
end:
return err;
}
static int set_stream_format(struct snd_oxfw *oxfw, struct amdtp_stream *s,
unsigned int rate, unsigned int pcm_channels)
{
u8 **formats;
struct snd_oxfw_stream_formation formation;
enum avc_general_plug_dir dir;
unsigned int len;
int i, err;
if (s == &oxfw->tx_stream) {
formats = oxfw->tx_stream_formats;
dir = AVC_GENERAL_PLUG_DIR_OUT;
} else {
formats = oxfw->rx_stream_formats;
dir = AVC_GENERAL_PLUG_DIR_IN;
}
/* Seek stream format for requirements. */
for (i = 0; i < SND_OXFW_STREAM_FORMAT_ENTRIES; i++) {
err = snd_oxfw_stream_parse_format(formats[i], &formation);
if (err < 0)
return err;
if ((formation.rate == rate) && (formation.pcm == pcm_channels))
break;
}
if (i == SND_OXFW_STREAM_FORMAT_ENTRIES)
return -EINVAL;
/* If assumed, just change rate. */
if (oxfw->assumed)
return set_rate(oxfw, rate);
/* Calculate format length. */
len = 5 + formats[i][4] * 2;
err = avc_stream_set_format(oxfw->unit, dir, 0, formats[i], len);
if (err < 0)
return err;
/* Some requests just after changing format causes freezing. */
msleep(100);
return 0;
}
static int start_stream(struct snd_oxfw *oxfw, struct amdtp_stream *stream)
{
struct cmp_connection *conn;
int err;
if (stream == &oxfw->rx_stream)
conn = &oxfw->in_conn;
else
conn = &oxfw->out_conn;
err = cmp_connection_establish(conn);
if (err < 0)
return err;
err = amdtp_domain_add_stream(&oxfw->domain, stream,
conn->resources.channel, conn->speed);
if (err < 0) {
cmp_connection_break(conn);
return err;
}
return 0;
}
static int check_connection_used_by_others(struct snd_oxfw *oxfw,
struct amdtp_stream *stream)
{
struct cmp_connection *conn;
bool used;
int err;
if (stream == &oxfw->tx_stream)
conn = &oxfw->out_conn;
else
conn = &oxfw->in_conn;
err = cmp_connection_check_used(conn, &used);
if ((err >= 0) && used && !amdtp_stream_running(stream)) {
dev_err(&oxfw->unit->device,
"Connection established by others: %cPCR[%d]\n",
(conn->direction == CMP_OUTPUT) ? 'o' : 'i',
conn->pcr_index);
err = -EBUSY;
}
return err;
}
static int init_stream(struct snd_oxfw *oxfw, struct amdtp_stream *stream)
{
struct cmp_connection *conn;
enum cmp_direction c_dir;
enum amdtp_stream_direction s_dir;
unsigned int flags = 0;
int err;
if (!(oxfw->quirks & SND_OXFW_QUIRK_BLOCKING_TRANSMISSION))
flags |= CIP_NONBLOCKING;
else
flags |= CIP_BLOCKING;
// OXFW 970/971 has no function to generate playback timing according to the sequence
// of value in syt field, thus the packet should include NO_INFO value in the field.
// However, some models just ignore data blocks in packet with NO_INFO for audio data
// processing.
if (!(oxfw->quirks & SND_OXFW_QUIRK_IGNORE_NO_INFO_PACKET))
flags |= CIP_UNAWARE_SYT;
if (stream == &oxfw->tx_stream) {
conn = &oxfw->out_conn;
c_dir = CMP_OUTPUT;
s_dir = AMDTP_IN_STREAM;
if (oxfw->quirks & SND_OXFW_QUIRK_JUMBO_PAYLOAD)
flags |= CIP_JUMBO_PAYLOAD;
if (oxfw->quirks & SND_OXFW_QUIRK_WRONG_DBS)
flags |= CIP_WRONG_DBS;
if (oxfw->quirks & SND_OXFW_QUIRK_DBC_IS_TOTAL_PAYLOAD_QUADLETS)
flags |= CIP_DBC_IS_END_EVENT | CIP_DBC_IS_PAYLOAD_QUADLETS;
} else {
conn = &oxfw->in_conn;
c_dir = CMP_INPUT;
s_dir = AMDTP_OUT_STREAM;
}
err = cmp_connection_init(conn, oxfw->unit, c_dir, 0);
if (err < 0)
return err;
err = amdtp_am824_init(stream, oxfw->unit, s_dir, flags);
if (err < 0) {
cmp_connection_destroy(conn);
return err;
}
return 0;
}
static int keep_resources(struct snd_oxfw *oxfw, struct amdtp_stream *stream)
{
enum avc_general_plug_dir dir;
u8 **formats;
struct snd_oxfw_stream_formation formation;
struct cmp_connection *conn;
int i;
int err;
if (stream == &oxfw->rx_stream) {
dir = AVC_GENERAL_PLUG_DIR_IN;
formats = oxfw->rx_stream_formats;
conn = &oxfw->in_conn;
} else {
dir = AVC_GENERAL_PLUG_DIR_OUT;
formats = oxfw->tx_stream_formats;
conn = &oxfw->out_conn;
}
err = snd_oxfw_stream_get_current_formation(oxfw, dir, &formation);
if (err < 0)
return err;
for (i = 0; i < SND_OXFW_STREAM_FORMAT_ENTRIES; i++) {
struct snd_oxfw_stream_formation fmt;
if (formats[i] == NULL)
break;
err = snd_oxfw_stream_parse_format(formats[i], &fmt);
if (err < 0)
return err;
if (fmt.rate == formation.rate && fmt.pcm == formation.pcm &&
fmt.midi == formation.midi)
break;
}
if (i == SND_OXFW_STREAM_FORMAT_ENTRIES)
return -EINVAL;
// The stream should have one pcm channels at least.
if (formation.pcm == 0)
return -EINVAL;
err = amdtp_am824_set_parameters(stream, formation.rate, formation.pcm,
formation.midi * 8, false);
if (err < 0)
return err;
return cmp_connection_reserve(conn, amdtp_stream_get_max_payload(stream));
}
int snd_oxfw_stream_reserve_duplex(struct snd_oxfw *oxfw,
struct amdtp_stream *stream,
unsigned int rate, unsigned int pcm_channels,
unsigned int frames_per_period,
unsigned int frames_per_buffer)
{
struct snd_oxfw_stream_formation formation;
enum avc_general_plug_dir dir;
int err;
// Considering JACK/FFADO streaming:
// TODO: This can be removed hwdep functionality becomes popular.
err = check_connection_used_by_others(oxfw, &oxfw->rx_stream);
if (err < 0)
return err;
if (oxfw->has_output) {
err = check_connection_used_by_others(oxfw, &oxfw->tx_stream);
if (err < 0)
return err;
}
if (stream == &oxfw->tx_stream)
dir = AVC_GENERAL_PLUG_DIR_OUT;
else
dir = AVC_GENERAL_PLUG_DIR_IN;
err = snd_oxfw_stream_get_current_formation(oxfw, dir, &formation);
if (err < 0)
return err;
if (rate == 0) {
rate = formation.rate;
pcm_channels = formation.pcm;
}
if (formation.rate != rate || formation.pcm != pcm_channels) {
amdtp_domain_stop(&oxfw->domain);
cmp_connection_break(&oxfw->in_conn);
cmp_connection_release(&oxfw->in_conn);
if (oxfw->has_output) {
cmp_connection_break(&oxfw->out_conn);
cmp_connection_release(&oxfw->out_conn);
}
}
if (oxfw->substreams_count == 0 ||
formation.rate != rate || formation.pcm != pcm_channels) {
err = set_stream_format(oxfw, stream, rate, pcm_channels);
if (err < 0) {
dev_err(&oxfw->unit->device,
"fail to set stream format: %d\n", err);
return err;
}
err = keep_resources(oxfw, &oxfw->rx_stream);
if (err < 0)
return err;
if (oxfw->has_output) {
err = keep_resources(oxfw, &oxfw->tx_stream);
if (err < 0) {
cmp_connection_release(&oxfw->in_conn);
return err;
}
}
err = amdtp_domain_set_events_per_period(&oxfw->domain,
frames_per_period, frames_per_buffer);
if (err < 0) {
cmp_connection_release(&oxfw->in_conn);
if (oxfw->has_output)
cmp_connection_release(&oxfw->out_conn);
return err;
}
}
return 0;
}
int snd_oxfw_stream_start_duplex(struct snd_oxfw *oxfw)
{
int err;
if (oxfw->substreams_count == 0)
return -EIO;
if (amdtp_streaming_error(&oxfw->rx_stream) ||
amdtp_streaming_error(&oxfw->tx_stream)) {
amdtp_domain_stop(&oxfw->domain);
cmp_connection_break(&oxfw->in_conn);
if (oxfw->has_output)
cmp_connection_break(&oxfw->out_conn);
}
if (!amdtp_stream_running(&oxfw->rx_stream)) {
unsigned int tx_init_skip_cycles = 0;
bool replay_seq = false;
err = start_stream(oxfw, &oxfw->rx_stream);
if (err < 0) {
dev_err(&oxfw->unit->device,
"fail to prepare rx stream: %d\n", err);
goto error;
}
if (oxfw->has_output &&
!amdtp_stream_running(&oxfw->tx_stream)) {
err = start_stream(oxfw, &oxfw->tx_stream);
if (err < 0) {
dev_err(&oxfw->unit->device,
"fail to prepare tx stream: %d\n", err);
goto error;
}
if (oxfw->quirks & SND_OXFW_QUIRK_JUMBO_PAYLOAD) {
// Just after changing sampling transfer frequency, many cycles are
// skipped for packet transmission.
tx_init_skip_cycles = 400;
} else if (oxfw->quirks & SND_OXFW_QUIRK_VOLUNTARY_RECOVERY) {
// It takes a bit time for target device to adjust event frequency
// according to nominal event frequency in isochronous packets from
// ALSA oxfw driver.
tx_init_skip_cycles = 4000;
} else {
replay_seq = true;
}
}
// NOTE: The device ignores presentation time expressed by the value of syt field
// of CIP header in received packets. The sequence of the number of data blocks per
// packet is important for media clock recovery.
err = amdtp_domain_start(&oxfw->domain, tx_init_skip_cycles, replay_seq, false);
if (err < 0)
goto error;
if (!amdtp_domain_wait_ready(&oxfw->domain, READY_TIMEOUT_MS)) {
err = -ETIMEDOUT;
goto error;
}
}
return 0;
error:
amdtp_domain_stop(&oxfw->domain);
cmp_connection_break(&oxfw->in_conn);
if (oxfw->has_output)
cmp_connection_break(&oxfw->out_conn);
return err;
}
void snd_oxfw_stream_stop_duplex(struct snd_oxfw *oxfw)
{
if (oxfw->substreams_count == 0) {
amdtp_domain_stop(&oxfw->domain);
cmp_connection_break(&oxfw->in_conn);
cmp_connection_release(&oxfw->in_conn);
if (oxfw->has_output) {
cmp_connection_break(&oxfw->out_conn);
cmp_connection_release(&oxfw->out_conn);
}
}
}
static void destroy_stream(struct snd_oxfw *oxfw, struct amdtp_stream *stream)
{
struct cmp_connection *conn;
if (stream == &oxfw->tx_stream)
conn = &oxfw->out_conn;
else
conn = &oxfw->in_conn;
amdtp_stream_destroy(stream);
cmp_connection_destroy(conn);
}
int snd_oxfw_stream_init_duplex(struct snd_oxfw *oxfw)
{
int err;
err = init_stream(oxfw, &oxfw->rx_stream);
if (err < 0)
return err;
if (oxfw->has_output) {
err = init_stream(oxfw, &oxfw->tx_stream);
if (err < 0) {
destroy_stream(oxfw, &oxfw->rx_stream);
return err;
}
}
err = amdtp_domain_init(&oxfw->domain);
if (err < 0) {
destroy_stream(oxfw, &oxfw->rx_stream);
if (oxfw->has_output)
destroy_stream(oxfw, &oxfw->tx_stream);
}
return err;
}
// This function should be called before starting the stream or after stopping
// the streams.
void snd_oxfw_stream_destroy_duplex(struct snd_oxfw *oxfw)
{
amdtp_domain_destroy(&oxfw->domain);
destroy_stream(oxfw, &oxfw->rx_stream);
if (oxfw->has_output)
destroy_stream(oxfw, &oxfw->tx_stream);
}
void snd_oxfw_stream_update_duplex(struct snd_oxfw *oxfw)
{
amdtp_domain_stop(&oxfw->domain);
cmp_connection_break(&oxfw->in_conn);
amdtp_stream_pcm_abort(&oxfw->rx_stream);
if (oxfw->has_output) {
cmp_connection_break(&oxfw->out_conn);
amdtp_stream_pcm_abort(&oxfw->tx_stream);
}
}
int snd_oxfw_stream_get_current_formation(struct snd_oxfw *oxfw,
enum avc_general_plug_dir dir,
struct snd_oxfw_stream_formation *formation)
{
int err;
if (!(oxfw->quirks & SND_OXFW_QUIRK_STREAM_FORMAT_INFO_UNSUPPORTED)) {
u8 *format;
unsigned int len;
len = AVC_GENERIC_FRAME_MAXIMUM_BYTES;
format = kmalloc(len, GFP_KERNEL);
if (format == NULL)
return -ENOMEM;
err = avc_stream_get_format_single(oxfw->unit, dir, 0, format, &len);
if (err >= 0) {
if (len < 3)
err = -EIO;
else
err = snd_oxfw_stream_parse_format(format, formation);
}
kfree(format);
} else {
// Miglia Harmony Audio does not support Extended Stream Format Information
// command. Use the duplicated hard-coded format, instead.
unsigned int rate;
u8 *const *formats;
int i;
err = avc_general_get_sig_fmt(oxfw->unit, &rate, dir, 0);
if (err < 0)
return err;
if (dir == AVC_GENERAL_PLUG_DIR_IN)
formats = oxfw->rx_stream_formats;
else
formats = oxfw->tx_stream_formats;
for (i = 0; (i < SND_OXFW_STREAM_FORMAT_ENTRIES); ++i) {
if (!formats[i])
continue;
err = snd_oxfw_stream_parse_format(formats[i], formation);
if (err < 0)
continue;
if (formation->rate == rate)
break;
}
if (i == SND_OXFW_STREAM_FORMAT_ENTRIES)
return -EIO;
}
return err;
}
/*
* See Table 6.16 - AM824 Stream Format
* Figure 6.19 - format_information field for AM824 Compound
* in AV/C Stream Format Information Specification 1.1 (Apr 2005, 1394TA)
* Also 'Clause 12 AM824 sequence adaption layers' in IEC 61883-6:2005
*/
int snd_oxfw_stream_parse_format(const u8 *format,
struct snd_oxfw_stream_formation *formation)
{
unsigned int i, e, channels, type;
memset(formation, 0, sizeof(struct snd_oxfw_stream_formation));
/*
* this module can support a hierarchy combination that:
* Root: Audio and Music (0x90)
* Level 1: AM824 Compound (0x40)
*/
if ((format[0] != 0x90) || (format[1] != 0x40))
return -ENXIO;
/* check the sampling rate */
for (i = 0; i < ARRAY_SIZE(avc_stream_rate_table); i++) {
if (format[2] == avc_stream_rate_table[i])
break;
}
if (i == ARRAY_SIZE(avc_stream_rate_table))
return -ENXIO;
formation->rate = oxfw_rate_table[i];
for (e = 0; e < format[4]; e++) {
channels = format[5 + e * 2];
type = format[6 + e * 2];
switch (type) {
/* IEC 60958 Conformant, currently handled as MBLA */
case 0x00:
/* Multi Bit Linear Audio (Raw) */
case 0x06:
formation->pcm += channels;
break;
/* MIDI Conformant */
case 0x0d:
formation->midi = channels;
break;
/* IEC 61937-3 to 7 */
case 0x01:
case 0x02:
case 0x03:
case 0x04:
case 0x05:
/* Multi Bit Linear Audio */
case 0x07: /* DVD-Audio */
case 0x0c: /* High Precision */
/* One Bit Audio */
case 0x08: /* (Plain) Raw */
case 0x09: /* (Plain) SACD */
case 0x0a: /* (Encoded) Raw */
case 0x0b: /* (Encoded) SACD */
/* SMPTE Time-Code conformant */
case 0x0e:
/* Sample Count */
case 0x0f:
/* Anciliary Data */
case 0x10:
/* Synchronization Stream (Stereo Raw audio) */
case 0x40:
/* Don't care */
case 0xff:
default:
return -ENXIO; /* not supported */
}
}
if (formation->pcm > AM824_MAX_CHANNELS_FOR_PCM ||
formation->midi > AM824_MAX_CHANNELS_FOR_MIDI)
return -ENXIO;
return 0;
}
static int
assume_stream_formats(struct snd_oxfw *oxfw, enum avc_general_plug_dir dir,
unsigned int pid, u8 *buf, unsigned int *len,
u8 **formats)
{
struct snd_oxfw_stream_formation formation;
unsigned int i, eid;
int err;
// get format at current sampling rate.
if (!(oxfw->quirks & SND_OXFW_QUIRK_STREAM_FORMAT_INFO_UNSUPPORTED)) {
err = avc_stream_get_format_single(oxfw->unit, dir, pid, buf, len);
if (err < 0) {
dev_err(&oxfw->unit->device,
"fail to get current stream format for isoc %s plug %d:%d\n",
(dir == AVC_GENERAL_PLUG_DIR_IN) ? "in" : "out",
pid, err);
goto end;
}
} else {
// Miglia Harmony Audio does not support Extended Stream Format Information
// command. Use the hard-coded format, instead.
buf[0] = 0x90;
buf[1] = 0x40;
buf[2] = avc_stream_rate_table[0];
buf[3] = 0x00;
buf[4] = 0x01;
if (dir == AVC_GENERAL_PLUG_DIR_IN)
buf[5] = 0x08;
else
buf[5] = 0x02;
buf[6] = 0x06;
*len = 7;
}
/* parse and set stream format */
eid = 0;
err = snd_oxfw_stream_parse_format(buf, &formation);
if (err < 0)
goto end;
formats[eid] = devm_kmemdup(&oxfw->card->card_dev, buf, *len,
GFP_KERNEL);
if (!formats[eid]) {
err = -ENOMEM;
goto end;
}
/* apply the format for each available sampling rate */
for (i = 0; i < ARRAY_SIZE(oxfw_rate_table); i++) {
if (formation.rate == oxfw_rate_table[i])
continue;
err = avc_general_inquiry_sig_fmt(oxfw->unit,
oxfw_rate_table[i],
dir, pid);
if (err < 0)
continue;
eid++;
formats[eid] = devm_kmemdup(&oxfw->card->card_dev, buf, *len,
GFP_KERNEL);
if (formats[eid] == NULL) {
err = -ENOMEM;
goto end;
}
formats[eid][2] = avc_stream_rate_table[i];
}
err = 0;
oxfw->assumed = true;
end:
return err;
}
static int fill_stream_formats(struct snd_oxfw *oxfw,
enum avc_general_plug_dir dir,
unsigned short pid)
{
u8 *buf, **formats;
unsigned int len, eid = 0;
struct snd_oxfw_stream_formation dummy;
int err;
buf = kmalloc(AVC_GENERIC_FRAME_MAXIMUM_BYTES, GFP_KERNEL);
if (buf == NULL)
return -ENOMEM;
if (dir == AVC_GENERAL_PLUG_DIR_OUT)
formats = oxfw->tx_stream_formats;
else
formats = oxfw->rx_stream_formats;
/* get first entry */
len = AVC_GENERIC_FRAME_MAXIMUM_BYTES;
err = avc_stream_get_format_list(oxfw->unit, dir, 0, buf, &len, 0);
if (err == -ENXIO) {
/* LIST subfunction is not implemented */
len = AVC_GENERIC_FRAME_MAXIMUM_BYTES;
err = assume_stream_formats(oxfw, dir, pid, buf, &len,
formats);
goto end;
} else if (err < 0) {
dev_err(&oxfw->unit->device,
"fail to get stream format %d for isoc %s plug %d:%d\n",
eid, (dir == AVC_GENERAL_PLUG_DIR_IN) ? "in" : "out",
pid, err);
goto end;
}
/* LIST subfunction is implemented */
while (eid < SND_OXFW_STREAM_FORMAT_ENTRIES) {
/* The format is too short. */
if (len < 3) {
err = -EIO;
break;
}
/* parse and set stream format */
err = snd_oxfw_stream_parse_format(buf, &dummy);
if (err < 0)
break;
formats[eid] = devm_kmemdup(&oxfw->card->card_dev, buf, len,
GFP_KERNEL);
if (!formats[eid]) {
err = -ENOMEM;
break;
}
/* get next entry */
len = AVC_GENERIC_FRAME_MAXIMUM_BYTES;
err = avc_stream_get_format_list(oxfw->unit, dir, 0,
buf, &len, ++eid);
/* No entries remained. */
if (err == -EINVAL) {
err = 0;
break;
} else if (err < 0) {
dev_err(&oxfw->unit->device,
"fail to get stream format %d for isoc %s plug %d:%d\n",
eid, (dir == AVC_GENERAL_PLUG_DIR_IN) ? "in" :
"out",
pid, err);
break;
}
}
end:
kfree(buf);
return err;
}
int snd_oxfw_stream_discover(struct snd_oxfw *oxfw)
{
u8 plugs[AVC_PLUG_INFO_BUF_BYTES];
struct snd_oxfw_stream_formation formation;
u8 *format;
unsigned int i;
int err;
/* the number of plugs for isoc in/out, ext in/out */
err = avc_general_get_plug_info(oxfw->unit, 0x1f, 0x07, 0x00, plugs);
if (err < 0) {
dev_err(&oxfw->unit->device,
"fail to get info for isoc/external in/out plugs: %d\n",
err);
goto end;
} else if ((plugs[0] == 0) && (plugs[1] == 0)) {
err = -ENXIO;
goto end;
}
/* use oPCR[0] if exists */
if (plugs[1] > 0) {
err = fill_stream_formats(oxfw, AVC_GENERAL_PLUG_DIR_OUT, 0);
if (err < 0) {
if (err != -ENXIO)
return err;
// The oPCR is not available for isoc communication.
err = 0;
} else {
for (i = 0; i < SND_OXFW_STREAM_FORMAT_ENTRIES; i++) {
format = oxfw->tx_stream_formats[i];
if (format == NULL)
continue;
err = snd_oxfw_stream_parse_format(format,
&formation);
if (err < 0)
continue;
/* Add one MIDI port. */
if (formation.midi > 0)
oxfw->midi_input_ports = 1;
}
oxfw->has_output = true;
}
}
/* use iPCR[0] if exists */
if (plugs[0] > 0) {
err = fill_stream_formats(oxfw, AVC_GENERAL_PLUG_DIR_IN, 0);
if (err < 0) {
if (err != -ENXIO)
return err;
// The iPCR is not available for isoc communication.
err = 0;
} else {
for (i = 0; i < SND_OXFW_STREAM_FORMAT_ENTRIES; i++) {
format = oxfw->rx_stream_formats[i];
if (format == NULL)
continue;
err = snd_oxfw_stream_parse_format(format,
&formation);
if (err < 0)
continue;
/* Add one MIDI port. */
if (formation.midi > 0)
oxfw->midi_output_ports = 1;
}
oxfw->has_input = true;
}
}
end:
return err;
}
void snd_oxfw_stream_lock_changed(struct snd_oxfw *oxfw)
{
oxfw->dev_lock_changed = true;
wake_up(&oxfw->hwdep_wait);
}
int snd_oxfw_stream_lock_try(struct snd_oxfw *oxfw)
{
int err;
spin_lock_irq(&oxfw->lock);
/* user land lock this */
if (oxfw->dev_lock_count < 0) {
err = -EBUSY;
goto end;
}
/* this is the first time */
if (oxfw->dev_lock_count++ == 0)
snd_oxfw_stream_lock_changed(oxfw);
err = 0;
end:
spin_unlock_irq(&oxfw->lock);
return err;
}
void snd_oxfw_stream_lock_release(struct snd_oxfw *oxfw)
{
spin_lock_irq(&oxfw->lock);
if (WARN_ON(oxfw->dev_lock_count <= 0))
goto end;
if (--oxfw->dev_lock_count == 0)
snd_oxfw_stream_lock_changed(oxfw);
end:
spin_unlock_irq(&oxfw->lock);
}
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