/*
* oxfw_stream.c - a part of driver for OXFW970/971 based devices
*
* Copyright (c) 2014 Takashi Sakamoto
*
* Licensed under the terms of the GNU General Public License, version 2.
*/
#include "oxfw.h"
#include <linux/delay.h>
#define AVC_GENERIC_FRAME_MAXIMUM_BYTES 512
#define CALLBACK_TIMEOUT 200
/*
* 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_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 i, err, len;
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 avc_general_set_sig_fmt(oxfw->unit, rate,
AVC_GENERAL_PLUG_DIR_IN, 0);
/* 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;
}
int snd_oxfw_stream_init_simplex(struct snd_oxfw *oxfw)
{
int err;
err = cmp_connection_init(&oxfw->in_conn, oxfw->unit,
CMP_INPUT, 0);
if (err < 0)
goto end;
err = amdtp_stream_init(&oxfw->rx_stream, oxfw->unit,
AMDTP_OUT_STREAM, CIP_NONBLOCKING);
if (err < 0) {
amdtp_stream_destroy(&oxfw->rx_stream);
cmp_connection_destroy(&oxfw->in_conn);
}
end:
return err;
}
static void stop_stream(struct snd_oxfw *oxfw)
{
amdtp_stream_pcm_abort(&oxfw->rx_stream);
amdtp_stream_stop(&oxfw->rx_stream);
cmp_connection_break(&oxfw->in_conn);
}
static int start_stream(struct snd_oxfw *oxfw, unsigned int rate,
unsigned int pcm_channels)
{
u8 **formats;
struct cmp_connection *conn;
struct snd_oxfw_stream_formation formation;
unsigned int i, midi_ports;
struct amdtp_stream *stream;
int err;
stream = &oxfw->rx_stream;
formats = oxfw->rx_stream_formats;
conn = &oxfw->in_conn;
/* Get stream formation */
for (i = 0; i < SND_OXFW_STREAM_FORMAT_ENTRIES; i++) {
if (formats[i] == NULL)
break;
err = snd_oxfw_stream_parse_format(formats[i], &formation);
if (err < 0)
goto end;
if (rate != formation.rate)
continue;
if (pcm_channels == 0 || pcm_channels == formation.pcm)
break;
}
if (i == SND_OXFW_STREAM_FORMAT_ENTRIES) {
err = -EINVAL;
goto end;
}
pcm_channels = formation.pcm;
midi_ports = DIV_ROUND_UP(formation.midi, 8);
/* The stream should have one pcm channels at least */
if (pcm_channels == 0) {
err = -EINVAL;
goto end;
}
amdtp_stream_set_parameters(stream, rate, pcm_channels, midi_ports);
err = cmp_connection_establish(conn,
amdtp_stream_get_max_payload(stream));
if (err < 0)
goto end;
err = amdtp_stream_start(stream,
conn->resources.channel,
conn->speed);
if (err < 0) {
cmp_connection_break(conn);
goto end;
}
/* Wait first packet */
err = amdtp_stream_wait_callback(stream, CALLBACK_TIMEOUT);
if (err < 0)
stop_stream(oxfw);
end:
return err;
}
int snd_oxfw_stream_start_simplex(struct snd_oxfw *oxfw, unsigned int rate,
unsigned int pcm_channels)
{
struct snd_oxfw_stream_formation formation;
int err = 0;
/* packet queueing error */
if (amdtp_streaming_error(&oxfw->rx_stream))
stop_stream(oxfw);
err = snd_oxfw_stream_get_current_formation(oxfw,
AVC_GENERAL_PLUG_DIR_IN,
&formation);
if (err < 0)
goto end;
if ((formation.rate != rate) || (formation.pcm != pcm_channels)) {
stop_stream(oxfw);
/* arrange sampling rate */
err = set_stream_format(oxfw, &oxfw->rx_stream, rate,
pcm_channels);
if (err < 0) {
dev_err(&oxfw->unit->device,
"fail to set stream format: %d\n", err);
goto end;
}
}
err = start_stream(oxfw, rate, pcm_channels);
if (err < 0)
dev_err(&oxfw->unit->device,
"fail to start stream: %d\n", err);
end:
return err;
}
void snd_oxfw_stream_stop_simplex(struct snd_oxfw *oxfw)
{
stop_stream(oxfw);
}
void snd_oxfw_stream_destroy_simplex(struct snd_oxfw *oxfw)
{
stop_stream(oxfw);
amdtp_stream_destroy(&oxfw->rx_stream);
cmp_connection_destroy(&oxfw->in_conn);
}
void snd_oxfw_stream_update_simplex(struct snd_oxfw *oxfw)
{
if (cmp_connection_update(&oxfw->in_conn) < 0)
stop_stream(oxfw);
else
amdtp_stream_update(&oxfw->rx_stream);
}
int snd_oxfw_stream_get_current_formation(struct snd_oxfw *oxfw,
enum avc_general_plug_dir dir,
struct snd_oxfw_stream_formation *formation)
{
u8 *format;
unsigned int len;
int err;
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)
goto end;
if (len < 3) {
err = -EIO;
goto end;
}
err = snd_oxfw_stream_parse_format(format, formation);
end:
kfree(format);
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(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 -ENOSYS;
/* 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 -ENOSYS;
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 -ENOSYS; /* not supported */
}
}
if (formation->pcm > AMDTP_MAX_CHANNELS_FOR_PCM ||
formation->midi > AMDTP_MAX_CHANNELS_FOR_MIDI)
return -ENOSYS;
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 */
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;
}
/* parse and set stream format */
eid = 0;
err = snd_oxfw_stream_parse_format(buf, &formation);
if (err < 0)
goto end;
formats[eid] = kmalloc(*len, GFP_KERNEL);
if (formats[eid] == NULL) {
err = -ENOMEM;
goto end;
}
memcpy(formats[eid], buf, *len);
/* 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] = kmalloc(*len, GFP_KERNEL);
if (formats[eid] == NULL) {
err = -ENOMEM;
goto end;
}
memcpy(formats[eid], buf, *len);
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;
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 == -ENOSYS) {
/* 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] = kmalloc(len, GFP_KERNEL);
if (formats[eid] == NULL) {
err = -ENOMEM;
break;
}
memcpy(formats[eid], buf, len);
/* 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];
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) {
err = -ENOSYS;
goto end;
}
/* use iPCR[0] if exists */
if (plugs[0] > 0)
err = fill_stream_formats(oxfw, AVC_GENERAL_PLUG_DIR_IN, 0);
end:
return err;
}
