diff options
author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
---|---|---|
committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
commit | 2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch) | |
tree | 848558de17fb3008cdf4d861b01ac7781903ce39 /sound/firewire/oxfw/oxfw-stream.c | |
parent | Initial commit. (diff) | |
download | linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip |
Adding upstream version 6.1.76.upstream/6.1.76upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | sound/firewire/oxfw/oxfw-stream.c | 846 |
1 files changed, 846 insertions, 0 deletions
diff --git a/sound/firewire/oxfw/oxfw-stream.c b/sound/firewire/oxfw/oxfw-stream.c new file mode 100644 index 000000000..f4a702def --- /dev/null +++ b/sound/firewire/oxfw/oxfw-stream.c @@ -0,0 +1,846 @@ +// 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; + } 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) +{ + 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 -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 */ + 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] = 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); +} |