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- /*
- * 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_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 void stop_stream(struct snd_oxfw *oxfw, struct amdtp_stream *stream)
- {
- amdtp_stream_pcm_abort(stream);
- amdtp_stream_stop(stream);
- if (stream == &oxfw->tx_stream)
- cmp_connection_break(&oxfw->out_conn);
- else
- cmp_connection_break(&oxfw->in_conn);
- }
- static int start_stream(struct snd_oxfw *oxfw, struct amdtp_stream *stream,
- unsigned int rate, unsigned int pcm_channels)
- {
- u8 **formats;
- struct cmp_connection *conn;
- struct snd_oxfw_stream_formation formation;
- unsigned int i, midi_ports;
- int err;
- if (stream == &oxfw->rx_stream) {
- formats = oxfw->rx_stream_formats;
- conn = &oxfw->in_conn;
- } else {
- formats = oxfw->tx_stream_formats;
- conn = &oxfw->out_conn;
- }
- /* Get stream format */
- 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 = formation.midi * 8;
- /* The stream should have one pcm channels at least */
- if (pcm_channels == 0) {
- err = -EINVAL;
- goto end;
- }
- err = amdtp_am824_set_parameters(stream, rate, pcm_channels, midi_ports,
- false);
- if (err < 0)
- goto end;
- 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 */
- if (!amdtp_stream_wait_callback(stream, CALLBACK_TIMEOUT)) {
- stop_stream(oxfw, stream);
- err = -ETIMEDOUT;
- }
- end:
- return err;
- }
- 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;
- }
- int snd_oxfw_stream_init_simplex(struct snd_oxfw *oxfw,
- struct amdtp_stream *stream)
- {
- struct cmp_connection *conn;
- enum cmp_direction c_dir;
- enum amdtp_stream_direction s_dir;
- int err;
- if (stream == &oxfw->tx_stream) {
- conn = &oxfw->out_conn;
- c_dir = CMP_OUTPUT;
- s_dir = AMDTP_IN_STREAM;
- } 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)
- goto end;
- err = amdtp_am824_init(stream, oxfw->unit, s_dir, CIP_NONBLOCKING);
- if (err < 0) {
- amdtp_stream_destroy(stream);
- cmp_connection_destroy(conn);
- goto end;
- }
- /*
- * OXFW starts to transmit packets with non-zero dbc.
- * OXFW postpone transferring packets till handling any asynchronous
- * packets. As a result, next isochronous packet includes more data
- * blocks than IEC 61883-6 defines.
- */
- if (stream == &oxfw->tx_stream) {
- oxfw->tx_stream.flags |= CIP_SKIP_INIT_DBC_CHECK |
- CIP_JUMBO_PAYLOAD;
- if (oxfw->wrong_dbs)
- oxfw->tx_stream.flags |= CIP_WRONG_DBS;
- }
- end:
- return err;
- }
- int snd_oxfw_stream_start_simplex(struct snd_oxfw *oxfw,
- struct amdtp_stream *stream,
- unsigned int rate, unsigned int pcm_channels)
- {
- struct amdtp_stream *opposite;
- struct snd_oxfw_stream_formation formation;
- enum avc_general_plug_dir dir;
- unsigned int substreams, opposite_substreams;
- int err = 0;
- if (stream == &oxfw->tx_stream) {
- substreams = oxfw->capture_substreams;
- opposite = &oxfw->rx_stream;
- opposite_substreams = oxfw->playback_substreams;
- dir = AVC_GENERAL_PLUG_DIR_OUT;
- } else {
- substreams = oxfw->playback_substreams;
- opposite_substreams = oxfw->capture_substreams;
- if (oxfw->has_output)
- opposite = &oxfw->rx_stream;
- else
- opposite = NULL;
- dir = AVC_GENERAL_PLUG_DIR_IN;
- }
- if (substreams == 0)
- goto end;
- /*
- * Considering JACK/FFADO streaming:
- * TODO: This can be removed hwdep functionality becomes popular.
- */
- err = check_connection_used_by_others(oxfw, stream);
- if (err < 0)
- goto end;
- /* packet queueing error */
- if (amdtp_streaming_error(stream))
- stop_stream(oxfw, stream);
- err = snd_oxfw_stream_get_current_formation(oxfw, dir, &formation);
- if (err < 0)
- goto end;
- if (rate == 0)
- rate = formation.rate;
- if (pcm_channels == 0)
- pcm_channels = formation.pcm;
- if ((formation.rate != rate) || (formation.pcm != pcm_channels)) {
- if (opposite != NULL) {
- err = check_connection_used_by_others(oxfw, opposite);
- if (err < 0)
- goto end;
- stop_stream(oxfw, opposite);
- }
- stop_stream(oxfw, stream);
- 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);
- goto end;
- }
- /* Start opposite stream if needed. */
- if (opposite && !amdtp_stream_running(opposite) &&
- (opposite_substreams > 0)) {
- err = start_stream(oxfw, opposite, rate, 0);
- if (err < 0) {
- dev_err(&oxfw->unit->device,
- "fail to restart stream: %d\n", err);
- goto end;
- }
- }
- }
- /* Start requested stream. */
- if (!amdtp_stream_running(stream)) {
- err = start_stream(oxfw, stream, 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,
- struct amdtp_stream *stream)
- {
- if (((stream == &oxfw->tx_stream) && (oxfw->capture_substreams > 0)) ||
- ((stream == &oxfw->rx_stream) && (oxfw->playback_substreams > 0)))
- return;
- stop_stream(oxfw, stream);
- }
- /*
- * This function should be called before starting the stream or after stopping
- * the streams.
- */
- void snd_oxfw_stream_destroy_simplex(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);
- }
- void snd_oxfw_stream_update_simplex(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;
- if (cmp_connection_update(conn) < 0)
- stop_stream(oxfw, stream);
- else
- amdtp_stream_update(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 > AM824_MAX_CHANNELS_FOR_PCM ||
- formation->midi > AM824_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] = kmemdup(buf, *len, GFP_KERNEL);
- if (formats[eid] == NULL) {
- 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] = kmemdup(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 == -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] = kmemdup(buf, len, GFP_KERNEL);
- if (formats[eid] == NULL) {
- 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 = -ENOSYS;
- 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)
- goto end;
- 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)
- goto end;
- 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;
- }
- }
- 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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