// SPDX-License-Identifier: GPL-2.0-only
/*
* bebob_stream.c - a part of driver for BeBoB based devices
*
* Copyright (c) 2013-2014 Takashi Sakamoto
*/
#include "./bebob.h"
#define READY_TIMEOUT_MS 4000
/*
* NOTE;
* For BeBoB streams, Both of input and output CMP connection are important.
*
* For most devices, each CMP connection starts to transmit/receive a
* corresponding stream. But for a few devices, both of CMP connection needs
* to start transmitting stream. An example is 'M-Audio Firewire 410'.
*/
/* 128 is an arbitrary length but it seems to be enough */
#define FORMAT_MAXIMUM_LENGTH 128
const unsigned int snd_bebob_rate_table[SND_BEBOB_STRM_FMT_ENTRIES] = {
[0] = 32000,
[1] = 44100,
[2] = 48000,
[3] = 88200,
[4] = 96000,
[5] = 176400,
[6] = 192000,
};
/*
* See: Table 51: Extended Stream Format Info ‘Sampling Frequency’
* in Additional AVC commands (Nov 2003, BridgeCo)
*/
static const unsigned int bridgeco_freq_table[] = {
[0] = 0x02,
[1] = 0x03,
[2] = 0x04,
[3] = 0x0a,
[4] = 0x05,
[5] = 0x06,
[6] = 0x07,
};
static int
get_formation_index(unsigned int rate, unsigned int *index)
{
unsigned int i;
for (i = 0; i < ARRAY_SIZE(snd_bebob_rate_table); i++) {
if (snd_bebob_rate_table[i] == rate) {
*index = i;
return 0;
}
}
return -EINVAL;
}
int
snd_bebob_stream_get_rate(struct snd_bebob *bebob, unsigned int *curr_rate)
{
unsigned int tx_rate, rx_rate, trials;
int err;
trials = 0;
do {
err = avc_general_get_sig_fmt(bebob->unit, &tx_rate,
AVC_GENERAL_PLUG_DIR_OUT, 0);
} while (err == -EAGAIN && ++trials < 3);
if (err < 0)
goto end;
trials = 0;
do {
err = avc_general_get_sig_fmt(bebob->unit, &rx_rate,
AVC_GENERAL_PLUG_DIR_IN, 0);
} while (err == -EAGAIN && ++trials < 3);
if (err < 0)
goto end;
*curr_rate = rx_rate;
if (rx_rate == tx_rate)
goto end;
/* synchronize receive stream rate to transmit stream rate */
err = avc_general_set_sig_fmt(bebob->unit, rx_rate,
AVC_GENERAL_PLUG_DIR_IN, 0);
end:
return err;
}
int
snd_bebob_stream_set_rate(struct snd_bebob *bebob, unsigned int rate)
{
int err;
err = avc_general_set_sig_fmt(bebob->unit, rate,
AVC_GENERAL_PLUG_DIR_OUT, 0);
if (err < 0)
goto end;
err = avc_general_set_sig_fmt(bebob->unit, rate,
AVC_GENERAL_PLUG_DIR_IN, 0);
if (err < 0)
goto end;
/*
* Some devices need a bit time for transition.
* 300msec is got by some experiments.
*/
msleep(300);
end:
return err;
}
int snd_bebob_stream_get_clock_src(struct snd_bebob *bebob,
enum snd_bebob_clock_type *src)
{
const struct snd_bebob_clock_spec *clk_spec = bebob->spec->clock;
u8 addr[AVC_BRIDGECO_ADDR_BYTES], input[7];
unsigned int id;
enum avc_bridgeco_plug_type type;
int err = 0;
/* 1.The device has its own operation to switch source of clock */
if (clk_spec) {
err = clk_spec->get(bebob, &id);
if (err < 0) {
dev_err(&bebob->unit->device,
"fail to get clock source: %d\n", err);
goto end;
}
if (id >= clk_spec->num) {
dev_err(&bebob->unit->device,
"clock source %d out of range 0..%d\n",
id, clk_spec->num - 1);
err = -EIO;
goto end;
}
*src = clk_spec->types[id];
goto end;
}
/*
* 2.The device don't support to switch source of clock then assumed
* to use internal clock always
*/
if (bebob->sync_input_plug < 0) {
*src = SND_BEBOB_CLOCK_TYPE_INTERNAL;
goto end;
}
/*
* 3.The device supports to switch source of clock by an usual way.
* Let's check input for 'Music Sub Unit Sync Input' plug.
*/
avc_bridgeco_fill_msu_addr(addr, AVC_BRIDGECO_PLUG_DIR_IN,
bebob->sync_input_plug);
err = avc_bridgeco_get_plug_input(bebob->unit, addr, input);
if (err < 0) {
dev_err(&bebob->unit->device,
"fail to get an input for MSU in plug %d: %d\n",
bebob->sync_input_plug, err);
goto end;
}
/*
* If there are no input plugs, all of fields are 0xff.
* Here check the first field. This field is used for direction.
*/
if (input[0] == 0xff) {
*src = SND_BEBOB_CLOCK_TYPE_INTERNAL;
goto end;
}
/* The source from any output plugs is for one purpose only. */
if (input[0] == AVC_BRIDGECO_PLUG_DIR_OUT) {
/*
* In BeBoB architecture, the source from music subunit may
* bypass from oPCR[0]. This means that this source gives
* synchronization to IEEE 1394 cycle start packet.
*/
if (input[1] == AVC_BRIDGECO_PLUG_MODE_SUBUNIT &&
input[2] == 0x0c) {
*src = SND_BEBOB_CLOCK_TYPE_INTERNAL;
goto end;
}
/* The source from any input units is for several purposes. */
} else if (input[1] == AVC_BRIDGECO_PLUG_MODE_UNIT) {
if (input[2] == AVC_BRIDGECO_PLUG_UNIT_ISOC) {
if (input[3] == 0x00) {
/*
* This source comes from iPCR[0]. This means
* that presentation timestamp calculated by
* SYT series of the received packets. In
* short, this driver is the master of
* synchronization.
*/
*src = SND_BEBOB_CLOCK_TYPE_SYT;
goto end;
} else {
/*
* This source comes from iPCR[1-29]. This
* means that the synchronization stream is not
* the Audio/MIDI compound stream.
*/
*src = SND_BEBOB_CLOCK_TYPE_EXTERNAL;
goto end;
}
} else if (input[2] == AVC_BRIDGECO_PLUG_UNIT_EXT) {
/* Check type of this plug. */
avc_bridgeco_fill_unit_addr(addr,
AVC_BRIDGECO_PLUG_DIR_IN,
AVC_BRIDGECO_PLUG_UNIT_EXT,
input[3]);
err = avc_bridgeco_get_plug_type(bebob->unit, addr,
&type);
if (err < 0)
goto end;
if (type == AVC_BRIDGECO_PLUG_TYPE_DIG) {
/*
* SPDIF/ADAT or sometimes (not always) word
* clock.
*/
*src = SND_BEBOB_CLOCK_TYPE_EXTERNAL;
goto end;
} else if (type == AVC_BRIDGECO_PLUG_TYPE_SYNC) {
/* Often word clock. */
*src = SND_BEBOB_CLOCK_TYPE_EXTERNAL;
goto end;
} else if (type == AVC_BRIDGECO_PLUG_TYPE_ADDITION) {
/*
* Not standard.
* Mostly, additional internal clock.
*/
*src = SND_BEBOB_CLOCK_TYPE_INTERNAL;
goto end;
}
}
}
/* Not supported. */
err = -EIO;
end:
return err;
}
static int map_data_channels(struct snd_bebob *bebob, struct amdtp_stream *s)
{
unsigned int sec, sections, ch, channels;
unsigned int pcm, midi, location;
unsigned int stm_pos, sec_loc, pos;
u8 *buf, addr[AVC_BRIDGECO_ADDR_BYTES], type;
enum avc_bridgeco_plug_dir dir;
int err;
/*
* The length of return value of this command cannot be expected. Here
* use the maximum length of FCP.
*/
buf = kzalloc(256, GFP_KERNEL);
if (buf == NULL)
return -ENOMEM;
if (s == &bebob->tx_stream)
dir = AVC_BRIDGECO_PLUG_DIR_OUT;
else
dir = AVC_BRIDGECO_PLUG_DIR_IN;
avc_bridgeco_fill_unit_addr(addr, dir, AVC_BRIDGECO_PLUG_UNIT_ISOC, 0);
err = avc_bridgeco_get_plug_ch_pos(bebob->unit, addr, buf, 256);
if (err < 0) {
dev_err(&bebob->unit->device,
"fail to get channel position for isoc %s plug 0: %d\n",
(dir == AVC_BRIDGECO_PLUG_DIR_IN) ? "in" : "out",
err);
goto end;
}
pos = 0;
/* positions in I/O buffer */
pcm = 0;
midi = 0;
/* the number of sections in AMDTP packet */
sections = buf[pos++];
for (sec = 0; sec < sections; sec++) {
/* type of this section */
avc_bridgeco_fill_unit_addr(addr, dir,
AVC_BRIDGECO_PLUG_UNIT_ISOC, 0);
err = avc_bridgeco_get_plug_section_type(bebob->unit, addr,
sec, &type);
if (err < 0) {
dev_err(&bebob->unit->device,
"fail to get section type for isoc %s plug 0: %d\n",
(dir == AVC_BRIDGECO_PLUG_DIR_IN) ? "in" :
"out",
err);
goto end;
}
/* NoType */
if (type == 0xff) {
err = -ENOSYS;
goto end;
}
/* the number of channels in this section */
channels = buf[pos++];
for (ch = 0; ch < channels; ch++) {
/* position of this channel in AMDTP packet */
stm_pos = buf[pos++] - 1;
/* location of this channel in this section */
sec_loc = buf[pos++] - 1;
/*
* Basically the number of location is within the
* number of channels in this section. But some models
* of M-Audio don't follow this. Its location for MIDI
* is the position of MIDI channels in AMDTP packet.
*/
if (sec_loc >= channels)
sec_loc = ch;
switch (type) {
/* for MIDI conformant data channel */
case 0x0a:
/* AMDTP_MAX_CHANNELS_FOR_MIDI is 1. */
if ((midi > 0) && (stm_pos != midi)) {
err = -ENOSYS;
goto end;
}
amdtp_am824_set_midi_position(s, stm_pos);
midi = stm_pos;
break;
/* for PCM data channel */
case 0x01: /* Headphone */
case 0x02: /* Microphone */
case 0x03: /* Line */
case 0x04: /* SPDIF */
case 0x05: /* ADAT */
case 0x06: /* TDIF */
case 0x07: /* MADI */
/* for undefined/changeable signal */
case 0x08: /* Analog */
case 0x09: /* Digital */
default:
location = pcm + sec_loc;
if (location >= AM824_MAX_CHANNELS_FOR_PCM) {
err = -ENOSYS;
goto end;
}
amdtp_am824_set_pcm_position(s, location,
stm_pos);
break;
}
}
if (type != 0x0a)
pcm += channels;
else
midi += channels;
}
end:
kfree(buf);
return err;
}
static int
check_connection_used_by_others(struct snd_bebob *bebob, struct amdtp_stream *s)
{
struct cmp_connection *conn;
bool used;
int err;
if (s == &bebob->tx_stream)
conn = &bebob->out_conn;
else
conn = &bebob->in_conn;
err = cmp_connection_check_used(conn, &used);
if ((err >= 0) && used && !amdtp_stream_running(s)) {
dev_err(&bebob->unit->device,
"Connection established by others: %cPCR[%d]\n",
(conn->direction == CMP_OUTPUT) ? 'o' : 'i',
conn->pcr_index);
err = -EBUSY;
}
return err;
}
static void break_both_connections(struct snd_bebob *bebob)
{
cmp_connection_break(&bebob->in_conn);
cmp_connection_break(&bebob->out_conn);
}
static int start_stream(struct snd_bebob *bebob, struct amdtp_stream *stream)
{
struct cmp_connection *conn;
int err = 0;
if (stream == &bebob->rx_stream)
conn = &bebob->in_conn;
else
conn = &bebob->out_conn;
// channel mapping.
if (bebob->maudio_special_quirk == NULL) {
err = map_data_channels(bebob, stream);
if (err < 0)
return err;
}
err = cmp_connection_establish(conn);
if (err < 0)
return err;
return amdtp_domain_add_stream(&bebob->domain, stream,
conn->resources.channel, conn->speed);
}
static int init_stream(struct snd_bebob *bebob, struct amdtp_stream *stream)
{
unsigned int flags = CIP_BLOCKING;
enum amdtp_stream_direction dir_stream;
struct cmp_connection *conn;
enum cmp_direction dir_conn;
int err;
if (stream == &bebob->tx_stream) {
dir_stream = AMDTP_IN_STREAM;
conn = &bebob->out_conn;
dir_conn = CMP_OUTPUT;
} else {
dir_stream = AMDTP_OUT_STREAM;
conn = &bebob->in_conn;
dir_conn = CMP_INPUT;
}
if (stream == &bebob->tx_stream) {
if (bebob->quirks & SND_BEBOB_QUIRK_WRONG_DBC)
flags |= CIP_EMPTY_HAS_WRONG_DBC;
}
err = cmp_connection_init(conn, bebob->unit, dir_conn, 0);
if (err < 0)
return err;
err = amdtp_am824_init(stream, bebob->unit, dir_stream, flags);
if (err < 0) {
cmp_connection_destroy(conn);
return err;
}
return 0;
}
static void destroy_stream(struct snd_bebob *bebob, struct amdtp_stream *stream)
{
amdtp_stream_destroy(stream);
if (stream == &bebob->tx_stream)
cmp_connection_destroy(&bebob->out_conn);
else
cmp_connection_destroy(&bebob->in_conn);
}
int snd_bebob_stream_init_duplex(struct snd_bebob *bebob)
{
int err;
err = init_stream(bebob, &bebob->tx_stream);
if (err < 0)
return err;
err = init_stream(bebob, &bebob->rx_stream);
if (err < 0) {
destroy_stream(bebob, &bebob->tx_stream);
return err;
}
err = amdtp_domain_init(&bebob->domain);
if (err < 0) {
destroy_stream(bebob, &bebob->tx_stream);
destroy_stream(bebob, &bebob->rx_stream);
}
return err;
}
static int keep_resources(struct snd_bebob *bebob, struct amdtp_stream *stream,
unsigned int rate, unsigned int index)
{
unsigned int pcm_channels;
unsigned int midi_ports;
struct cmp_connection *conn;
int err;
if (stream == &bebob->tx_stream) {
pcm_channels = bebob->tx_stream_formations[index].pcm;
midi_ports = bebob->midi_input_ports;
conn = &bebob->out_conn;
} else {
pcm_channels = bebob->rx_stream_formations[index].pcm;
midi_ports = bebob->midi_output_ports;
conn = &bebob->in_conn;
}
err = amdtp_am824_set_parameters(stream, rate, pcm_channels, midi_ports, false);
if (err < 0)
return err;
return cmp_connection_reserve(conn, amdtp_stream_get_max_payload(stream));
}
int snd_bebob_stream_reserve_duplex(struct snd_bebob *bebob, unsigned int rate,
unsigned int frames_per_period,
unsigned int frames_per_buffer)
{
unsigned int curr_rate;
int err;
// Considering JACK/FFADO streaming:
// TODO: This can be removed hwdep functionality becomes popular.
err = check_connection_used_by_others(bebob, &bebob->rx_stream);
if (err < 0)
return err;
err = bebob->spec->rate->get(bebob, &curr_rate);
if (err < 0)
return err;
if (rate == 0)
rate = curr_rate;
if (curr_rate != rate) {
amdtp_domain_stop(&bebob->domain);
break_both_connections(bebob);
cmp_connection_release(&bebob->out_conn);
cmp_connection_release(&bebob->in_conn);
}
if (bebob->substreams_counter == 0 || curr_rate != rate) {
unsigned int index;
// NOTE:
// If establishing connections at first, Yamaha GO46
// (and maybe Terratec X24) don't generate sound.
//
// For firmware customized by M-Audio, refer to next NOTE.
err = bebob->spec->rate->set(bebob, rate);
if (err < 0) {
dev_err(&bebob->unit->device,
"fail to set sampling rate: %d\n",
err);
return err;
}
err = get_formation_index(rate, &index);
if (err < 0)
return err;
err = keep_resources(bebob, &bebob->tx_stream, rate, index);
if (err < 0)
return err;
err = keep_resources(bebob, &bebob->rx_stream, rate, index);
if (err < 0) {
cmp_connection_release(&bebob->out_conn);
return err;
}
err = amdtp_domain_set_events_per_period(&bebob->domain,
frames_per_period, frames_per_buffer);
if (err < 0) {
cmp_connection_release(&bebob->out_conn);
cmp_connection_release(&bebob->in_conn);
return err;
}
}
return 0;
}
int snd_bebob_stream_start_duplex(struct snd_bebob *bebob)
{
int err;
// Need no substreams.
if (bebob->substreams_counter == 0)
return -EIO;
// packet queueing error or detecting discontinuity
if (amdtp_streaming_error(&bebob->rx_stream) ||
amdtp_streaming_error(&bebob->tx_stream)) {
amdtp_domain_stop(&bebob->domain);
break_both_connections(bebob);
}
if (!amdtp_stream_running(&bebob->rx_stream)) {
enum snd_bebob_clock_type src;
unsigned int curr_rate;
unsigned int tx_init_skip_cycles;
if (bebob->maudio_special_quirk) {
err = bebob->spec->rate->get(bebob, &curr_rate);
if (err < 0)
return err;
}
err = snd_bebob_stream_get_clock_src(bebob, &src);
if (err < 0)
return err;
err = start_stream(bebob, &bebob->rx_stream);
if (err < 0)
goto error;
err = start_stream(bebob, &bebob->tx_stream);
if (err < 0)
goto error;
if (!(bebob->quirks & SND_BEBOB_QUIRK_INITIAL_DISCONTINUOUS_DBC))
tx_init_skip_cycles = 0;
else
tx_init_skip_cycles = 16000;
// MEMO: Some devices start packet transmission long enough after establishment of
// CMP connection. In the early stage of packet streaming, any device transfers
// NODATA packets. After several hundred cycles, it begins to multiplex event into
// the packet with adequate value of syt field in CIP header. Some devices are
// strictly to generate any discontinuity in the sequence of tx packet when they
// receives inadequate sequence of value in syt field of CIP header. In the case,
// the request to break CMP connection is often corrupted, then any transaction
// results in unrecoverable error, sometimes generate bus-reset.
err = amdtp_domain_start(&bebob->domain, tx_init_skip_cycles, true, false);
if (err < 0)
goto error;
// NOTE:
// The firmware customized by M-Audio uses these commands to
// start transmitting stream. This is not usual way.
if (bebob->maudio_special_quirk) {
err = bebob->spec->rate->set(bebob, curr_rate);
if (err < 0) {
dev_err(&bebob->unit->device,
"fail to ensure sampling rate: %d\n",
err);
goto error;
}
}
// Some devices postpone start of transmission mostly for 1 sec after receives
// packets firstly.
if (!amdtp_domain_wait_ready(&bebob->domain, READY_TIMEOUT_MS)) {
err = -ETIMEDOUT;
goto error;
}
}
return 0;
error:
amdtp_domain_stop(&bebob->domain);
break_both_connections(bebob);
return err;
}
void snd_bebob_stream_stop_duplex(struct snd_bebob *bebob)
{
if (bebob->substreams_counter == 0) {
amdtp_domain_stop(&bebob->domain);
break_both_connections(bebob);
cmp_connection_release(&bebob->out_conn);
cmp_connection_release(&bebob->in_conn);
}
}
/*
* This function should be called before starting streams or after stopping
* streams.
*/
void snd_bebob_stream_destroy_duplex(struct snd_bebob *bebob)
{
amdtp_domain_destroy(&bebob->domain);
destroy_stream(bebob, &bebob->tx_stream);
destroy_stream(bebob, &bebob->rx_stream);
}
/*
* See: Table 50: Extended Stream Format Info Format Hierarchy Level 2’
* in Additional AVC commands (Nov 2003, BridgeCo)
* Also 'Clause 12 AM824 sequence adaption layers' in IEC 61883-6:2005
*/
static int
parse_stream_formation(u8 *buf, unsigned int len,
struct snd_bebob_stream_formation *formation)
{
unsigned int i, e, channels, format;
/*
* this module can support a hierarchy combination that:
* Root: Audio and Music (0x90)
* Level 1: AM824 Compound (0x40)
*/
if ((buf[0] != 0x90) || (buf[1] != 0x40))
return -ENOSYS;
/* check sampling rate */
for (i = 0; i < ARRAY_SIZE(bridgeco_freq_table); i++) {
if (buf[2] == bridgeco_freq_table[i])
break;
}
if (i == ARRAY_SIZE(bridgeco_freq_table))
return -ENOSYS;
/* Avoid double count by different entries for the same rate. */
memset(&formation[i], 0, sizeof(struct snd_bebob_stream_formation));
for (e = 0; e < buf[4]; e++) {
channels = buf[5 + e * 2];
format = buf[6 + e * 2];
switch (format) {
/* IEC 60958 Conformant, currently handled as MBLA */
case 0x00:
/* Multi bit linear audio */
case 0x06: /* Raw */
formation[i].pcm += channels;
break;
/* MIDI Conformant */
case 0x0d:
formation[i].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 */
/* Synchronization Stream (Stereo Raw audio) */
case 0x40:
/* Don't care */
case 0xff:
default:
return -ENOSYS; /* not supported */
}
}
if (formation[i].pcm > AM824_MAX_CHANNELS_FOR_PCM ||
formation[i].midi > AM824_MAX_CHANNELS_FOR_MIDI)
return -ENOSYS;
return 0;
}
static int fill_stream_formations(struct snd_bebob *bebob, u8 addr[AVC_BRIDGECO_ADDR_BYTES],
enum avc_bridgeco_plug_dir plug_dir, unsigned int plug_id,
struct snd_bebob_stream_formation *formations)
{
enum avc_bridgeco_plug_type plug_type;
u8 *buf;
unsigned int len, eid;
int err;
avc_bridgeco_fill_unit_addr(addr, plug_dir, AVC_BRIDGECO_PLUG_UNIT_ISOC, plug_id);
err = avc_bridgeco_get_plug_type(bebob->unit, addr, &plug_type);
if (err < 0) {
dev_err(&bebob->unit->device,
"Fail to get type for isoc %d plug 0: %d\n", plug_dir, err);
return err;
} else if (plug_type != AVC_BRIDGECO_PLUG_TYPE_ISOC)
return -ENXIO;
buf = kmalloc(FORMAT_MAXIMUM_LENGTH, GFP_KERNEL);
if (buf == NULL)
return -ENOMEM;
for (eid = 0; eid < SND_BEBOB_STRM_FMT_ENTRIES; ++eid) {
avc_bridgeco_fill_unit_addr(addr, plug_dir, AVC_BRIDGECO_PLUG_UNIT_ISOC, plug_id);
len = FORMAT_MAXIMUM_LENGTH;
err = avc_bridgeco_get_plug_strm_fmt(bebob->unit, addr, buf, &len, eid);
// No entries remained.
if (err == -EINVAL && eid > 0) {
err = 0;
break;
} else if (err < 0) {
dev_err(&bebob->unit->device,
"fail to get stream format %d for isoc %d plug %d:%d\n",
eid, plug_dir, plug_id, err);
break;
}
err = parse_stream_formation(buf, len, formations);
if (err < 0)
break;
}
kfree(buf);
return err;
}
static int detect_midi_ports(struct snd_bebob *bebob,
const struct snd_bebob_stream_formation *formats,
u8 addr[AVC_BRIDGECO_ADDR_BYTES], enum avc_bridgeco_plug_dir plug_dir,
unsigned int plug_count, unsigned int *midi_ports)
{
int i;
int err = 0;
*midi_ports = 0;
/// Detect the number of available MIDI ports when packet has MIDI conformant data channel.
for (i = 0; i < SND_BEBOB_STRM_FMT_ENTRIES; ++i) {
if (formats[i].midi > 0)
break;
}
if (i >= SND_BEBOB_STRM_FMT_ENTRIES)
return 0;
for (i = 0; i < plug_count; ++i) {
enum avc_bridgeco_plug_type plug_type;
unsigned int ch_count;
avc_bridgeco_fill_unit_addr(addr, plug_dir, AVC_BRIDGECO_PLUG_UNIT_EXT, i);
err = avc_bridgeco_get_plug_type(bebob->unit, addr, &plug_type);
if (err < 0) {
dev_err(&bebob->unit->device,
"fail to get type for external %d plug %d: %d\n",
plug_dir, i, err);
break;
} else if (plug_type != AVC_BRIDGECO_PLUG_TYPE_MIDI) {
continue;
}
err = avc_bridgeco_get_plug_ch_count(bebob->unit, addr, &ch_count);
if (err < 0)
break;
// Yamaha GO44, GO46, Terratec Phase 24, Phase x24 reports 0 for the number of
// channels in external output plug 3 (MIDI type) even if it has a pair of physical
// MIDI jacks. As a workaround, assume it as one.
if (ch_count == 0)
ch_count = 1;
*midi_ports += ch_count;
}
return err;
}
static int
seek_msu_sync_input_plug(struct snd_bebob *bebob)
{
u8 plugs[AVC_PLUG_INFO_BUF_BYTES], addr[AVC_BRIDGECO_ADDR_BYTES];
unsigned int i;
enum avc_bridgeco_plug_type type;
int err;
/* Get the number of Music Sub Unit for both direction. */
err = avc_general_get_plug_info(bebob->unit, 0x0c, 0x00, 0x00, plugs);
if (err < 0) {
dev_err(&bebob->unit->device,
"fail to get info for MSU in/out plugs: %d\n",
err);
goto end;
}
/* seek destination plugs for 'MSU sync input' */
bebob->sync_input_plug = -1;
for (i = 0; i < plugs[0]; i++) {
avc_bridgeco_fill_msu_addr(addr, AVC_BRIDGECO_PLUG_DIR_IN, i);
err = avc_bridgeco_get_plug_type(bebob->unit, addr, &type);
if (err < 0) {
dev_err(&bebob->unit->device,
"fail to get type for MSU in plug %d: %d\n",
i, err);
goto end;
}
if (type == AVC_BRIDGECO_PLUG_TYPE_SYNC) {
bebob->sync_input_plug = i;
break;
}
}
end:
return err;
}
int snd_bebob_stream_discover(struct snd_bebob *bebob)
{
const struct snd_bebob_clock_spec *clk_spec = bebob->spec->clock;
u8 plugs[AVC_PLUG_INFO_BUF_BYTES], addr[AVC_BRIDGECO_ADDR_BYTES];
int err;
/* the number of plugs for isoc in/out, ext in/out */
err = avc_general_get_plug_info(bebob->unit, 0x1f, 0x07, 0x00, plugs);
if (err < 0) {
dev_err(&bebob->unit->device,
"fail to get info for isoc/external in/out plugs: %d\n",
err);
goto end;
}
/*
* This module supports at least one isoc input plug and one isoc
* output plug.
*/
if ((plugs[0] == 0) || (plugs[1] == 0)) {
err = -ENOSYS;
goto end;
}
err = fill_stream_formations(bebob, addr, AVC_BRIDGECO_PLUG_DIR_IN, 0,
bebob->rx_stream_formations);
if (err < 0)
goto end;
err = fill_stream_formations(bebob, addr, AVC_BRIDGECO_PLUG_DIR_OUT, 0,
bebob->tx_stream_formations);
if (err < 0)
goto end;
err = detect_midi_ports(bebob, bebob->tx_stream_formations, addr, AVC_BRIDGECO_PLUG_DIR_IN,
plugs[2], &bebob->midi_input_ports);
if (err < 0)
goto end;
err = detect_midi_ports(bebob, bebob->rx_stream_formations, addr, AVC_BRIDGECO_PLUG_DIR_OUT,
plugs[3], &bebob->midi_output_ports);
if (err < 0)
goto end;
/* for check source of clock later */
if (!clk_spec)
err = seek_msu_sync_input_plug(bebob);
end:
return err;
}
void snd_bebob_stream_lock_changed(struct snd_bebob *bebob)
{
bebob->dev_lock_changed = true;
wake_up(&bebob->hwdep_wait);
}
int snd_bebob_stream_lock_try(struct snd_bebob *bebob)
{
int err;
spin_lock_irq(&bebob->lock);
/* user land lock this */
if (bebob->dev_lock_count < 0) {
err = -EBUSY;
goto end;
}
/* this is the first time */
if (bebob->dev_lock_count++ == 0)
snd_bebob_stream_lock_changed(bebob);
err = 0;
end:
spin_unlock_irq(&bebob->lock);
return err;
}
void snd_bebob_stream_lock_release(struct snd_bebob *bebob)
{
spin_lock_irq(&bebob->lock);
if (WARN_ON(bebob->dev_lock_count <= 0))
goto end;
if (--bebob->dev_lock_count == 0)
snd_bebob_stream_lock_changed(bebob);
end:
spin_unlock_irq(&bebob->lock);
}
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