![Takashi Sakamoto](/assets/img/avatar_default.png)
ALSA oxfw driver allocates memory objects for cache of stream formats. The objects are used to maintain packet streaming by components for ALSA rawMIDI/PCM interface. They can be released as managed-resource of 'struct snd_card.card_dev'. This commit uses managed-resource of the sound card device for this purpose. Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Signed-off-by: Takashi Iwai <tiwai@suse.de>
734 lines
17 KiB
C
734 lines
17 KiB
C
/*
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* oxfw_stream.c - a part of driver for OXFW970/971 based devices
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*
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* Copyright (c) 2014 Takashi Sakamoto
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*
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* Licensed under the terms of the GNU General Public License, version 2.
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*/
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#include "oxfw.h"
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#include <linux/delay.h>
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#define AVC_GENERIC_FRAME_MAXIMUM_BYTES 512
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#define CALLBACK_TIMEOUT 200
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/*
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* According to datasheet of Oxford Semiconductor:
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* OXFW970: 32.0/44.1/48.0/96.0 Khz, 8 audio channels I/O
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* OXFW971: 32.0/44.1/48.0/88.2/96.0/192.0 kHz, 16 audio channels I/O, MIDI I/O
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*/
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static const unsigned int oxfw_rate_table[] = {
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[0] = 32000,
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[1] = 44100,
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[2] = 48000,
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[3] = 88200,
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[4] = 96000,
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[5] = 192000,
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};
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/*
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* See Table 5.7 – Sampling frequency for Multi-bit Audio
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* in AV/C Stream Format Information Specification 1.1 (Apr 2005, 1394TA)
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*/
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static const unsigned int avc_stream_rate_table[] = {
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[0] = 0x02,
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[1] = 0x03,
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[2] = 0x04,
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[3] = 0x0a,
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[4] = 0x05,
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[5] = 0x07,
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};
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static int set_rate(struct snd_oxfw *oxfw, unsigned int rate)
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{
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int err;
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err = avc_general_set_sig_fmt(oxfw->unit, rate,
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AVC_GENERAL_PLUG_DIR_IN, 0);
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if (err < 0)
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goto end;
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if (oxfw->has_output)
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err = avc_general_set_sig_fmt(oxfw->unit, rate,
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AVC_GENERAL_PLUG_DIR_OUT, 0);
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end:
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return err;
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}
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static int set_stream_format(struct snd_oxfw *oxfw, struct amdtp_stream *s,
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unsigned int rate, unsigned int pcm_channels)
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{
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u8 **formats;
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struct snd_oxfw_stream_formation formation;
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enum avc_general_plug_dir dir;
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unsigned int len;
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int i, err;
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if (s == &oxfw->tx_stream) {
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formats = oxfw->tx_stream_formats;
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dir = AVC_GENERAL_PLUG_DIR_OUT;
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} else {
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formats = oxfw->rx_stream_formats;
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dir = AVC_GENERAL_PLUG_DIR_IN;
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}
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/* Seek stream format for requirements. */
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for (i = 0; i < SND_OXFW_STREAM_FORMAT_ENTRIES; i++) {
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err = snd_oxfw_stream_parse_format(formats[i], &formation);
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if (err < 0)
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return err;
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if ((formation.rate == rate) && (formation.pcm == pcm_channels))
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break;
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}
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if (i == SND_OXFW_STREAM_FORMAT_ENTRIES)
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return -EINVAL;
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/* If assumed, just change rate. */
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if (oxfw->assumed)
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return set_rate(oxfw, rate);
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/* Calculate format length. */
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len = 5 + formats[i][4] * 2;
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err = avc_stream_set_format(oxfw->unit, dir, 0, formats[i], len);
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if (err < 0)
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return err;
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/* Some requests just after changing format causes freezing. */
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msleep(100);
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return 0;
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}
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static void stop_stream(struct snd_oxfw *oxfw, struct amdtp_stream *stream)
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{
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amdtp_stream_pcm_abort(stream);
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amdtp_stream_stop(stream);
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if (stream == &oxfw->tx_stream)
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cmp_connection_break(&oxfw->out_conn);
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else
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cmp_connection_break(&oxfw->in_conn);
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}
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static int start_stream(struct snd_oxfw *oxfw, struct amdtp_stream *stream,
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unsigned int rate, unsigned int pcm_channels)
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{
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u8 **formats;
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struct cmp_connection *conn;
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struct snd_oxfw_stream_formation formation;
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unsigned int i, midi_ports;
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int err;
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if (stream == &oxfw->rx_stream) {
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formats = oxfw->rx_stream_formats;
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conn = &oxfw->in_conn;
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} else {
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formats = oxfw->tx_stream_formats;
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conn = &oxfw->out_conn;
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}
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/* Get stream format */
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for (i = 0; i < SND_OXFW_STREAM_FORMAT_ENTRIES; i++) {
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if (formats[i] == NULL)
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break;
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err = snd_oxfw_stream_parse_format(formats[i], &formation);
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if (err < 0)
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goto end;
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if (rate != formation.rate)
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continue;
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if (pcm_channels == 0 || pcm_channels == formation.pcm)
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break;
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}
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if (i == SND_OXFW_STREAM_FORMAT_ENTRIES) {
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err = -EINVAL;
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goto end;
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}
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pcm_channels = formation.pcm;
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midi_ports = formation.midi * 8;
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/* The stream should have one pcm channels at least */
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if (pcm_channels == 0) {
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err = -EINVAL;
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goto end;
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}
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err = amdtp_am824_set_parameters(stream, rate, pcm_channels, midi_ports,
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false);
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if (err < 0)
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goto end;
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err = cmp_connection_establish(conn,
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amdtp_stream_get_max_payload(stream));
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if (err < 0)
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goto end;
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err = amdtp_stream_start(stream,
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conn->resources.channel,
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conn->speed);
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if (err < 0) {
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cmp_connection_break(conn);
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goto end;
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}
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/* Wait first packet */
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if (!amdtp_stream_wait_callback(stream, CALLBACK_TIMEOUT)) {
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stop_stream(oxfw, stream);
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err = -ETIMEDOUT;
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}
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end:
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return err;
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}
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static int check_connection_used_by_others(struct snd_oxfw *oxfw,
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struct amdtp_stream *stream)
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{
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struct cmp_connection *conn;
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bool used;
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int err;
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if (stream == &oxfw->tx_stream)
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conn = &oxfw->out_conn;
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else
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conn = &oxfw->in_conn;
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err = cmp_connection_check_used(conn, &used);
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if ((err >= 0) && used && !amdtp_stream_running(stream)) {
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dev_err(&oxfw->unit->device,
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"Connection established by others: %cPCR[%d]\n",
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(conn->direction == CMP_OUTPUT) ? 'o' : 'i',
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conn->pcr_index);
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err = -EBUSY;
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}
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return err;
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}
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int snd_oxfw_stream_init_simplex(struct snd_oxfw *oxfw,
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struct amdtp_stream *stream)
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{
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struct cmp_connection *conn;
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enum cmp_direction c_dir;
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enum amdtp_stream_direction s_dir;
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int err;
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if (stream == &oxfw->tx_stream) {
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conn = &oxfw->out_conn;
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c_dir = CMP_OUTPUT;
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s_dir = AMDTP_IN_STREAM;
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} else {
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conn = &oxfw->in_conn;
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c_dir = CMP_INPUT;
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s_dir = AMDTP_OUT_STREAM;
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}
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err = cmp_connection_init(conn, oxfw->unit, c_dir, 0);
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if (err < 0)
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goto end;
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err = amdtp_am824_init(stream, oxfw->unit, s_dir, CIP_NONBLOCKING);
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if (err < 0) {
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amdtp_stream_destroy(stream);
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cmp_connection_destroy(conn);
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goto end;
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}
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/*
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* OXFW starts to transmit packets with non-zero dbc.
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* OXFW postpone transferring packets till handling any asynchronous
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* packets. As a result, next isochronous packet includes more data
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* blocks than IEC 61883-6 defines.
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*/
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if (stream == &oxfw->tx_stream) {
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oxfw->tx_stream.flags |= CIP_JUMBO_PAYLOAD;
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if (oxfw->wrong_dbs)
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oxfw->tx_stream.flags |= CIP_WRONG_DBS;
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}
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end:
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return err;
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}
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int snd_oxfw_stream_start_simplex(struct snd_oxfw *oxfw,
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struct amdtp_stream *stream,
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unsigned int rate, unsigned int pcm_channels)
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{
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struct amdtp_stream *opposite;
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struct snd_oxfw_stream_formation formation;
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enum avc_general_plug_dir dir;
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unsigned int substreams, opposite_substreams;
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int err = 0;
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if (stream == &oxfw->tx_stream) {
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substreams = oxfw->capture_substreams;
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opposite = &oxfw->rx_stream;
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opposite_substreams = oxfw->playback_substreams;
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dir = AVC_GENERAL_PLUG_DIR_OUT;
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} else {
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substreams = oxfw->playback_substreams;
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opposite_substreams = oxfw->capture_substreams;
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if (oxfw->has_output)
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opposite = &oxfw->rx_stream;
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else
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opposite = NULL;
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dir = AVC_GENERAL_PLUG_DIR_IN;
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}
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if (substreams == 0)
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goto end;
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/*
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* Considering JACK/FFADO streaming:
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* TODO: This can be removed hwdep functionality becomes popular.
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*/
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err = check_connection_used_by_others(oxfw, stream);
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if (err < 0)
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goto end;
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/* packet queueing error */
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if (amdtp_streaming_error(stream))
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stop_stream(oxfw, stream);
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err = snd_oxfw_stream_get_current_formation(oxfw, dir, &formation);
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if (err < 0)
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goto end;
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if (rate == 0)
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rate = formation.rate;
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if (pcm_channels == 0)
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pcm_channels = formation.pcm;
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if ((formation.rate != rate) || (formation.pcm != pcm_channels)) {
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if (opposite != NULL) {
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err = check_connection_used_by_others(oxfw, opposite);
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if (err < 0)
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goto end;
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stop_stream(oxfw, opposite);
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}
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stop_stream(oxfw, stream);
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err = set_stream_format(oxfw, stream, rate, pcm_channels);
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if (err < 0) {
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dev_err(&oxfw->unit->device,
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"fail to set stream format: %d\n", err);
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goto end;
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}
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/* Start opposite stream if needed. */
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if (opposite && !amdtp_stream_running(opposite) &&
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(opposite_substreams > 0)) {
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err = start_stream(oxfw, opposite, rate, 0);
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if (err < 0) {
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dev_err(&oxfw->unit->device,
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"fail to restart stream: %d\n", err);
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goto end;
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}
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}
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}
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/* Start requested stream. */
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if (!amdtp_stream_running(stream)) {
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err = start_stream(oxfw, stream, rate, pcm_channels);
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if (err < 0)
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dev_err(&oxfw->unit->device,
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"fail to start stream: %d\n", err);
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}
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end:
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return err;
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}
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void snd_oxfw_stream_stop_simplex(struct snd_oxfw *oxfw,
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struct amdtp_stream *stream)
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{
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if (((stream == &oxfw->tx_stream) && (oxfw->capture_substreams > 0)) ||
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((stream == &oxfw->rx_stream) && (oxfw->playback_substreams > 0)))
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return;
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stop_stream(oxfw, stream);
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}
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/*
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* This function should be called before starting the stream or after stopping
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* the streams.
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*/
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void snd_oxfw_stream_destroy_simplex(struct snd_oxfw *oxfw,
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struct amdtp_stream *stream)
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{
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struct cmp_connection *conn;
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if (stream == &oxfw->tx_stream)
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conn = &oxfw->out_conn;
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else
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conn = &oxfw->in_conn;
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amdtp_stream_destroy(stream);
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cmp_connection_destroy(conn);
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}
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void snd_oxfw_stream_update_simplex(struct snd_oxfw *oxfw,
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struct amdtp_stream *stream)
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{
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struct cmp_connection *conn;
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if (stream == &oxfw->tx_stream)
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conn = &oxfw->out_conn;
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else
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conn = &oxfw->in_conn;
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if (cmp_connection_update(conn) < 0)
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stop_stream(oxfw, stream);
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else
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amdtp_stream_update(stream);
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}
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int snd_oxfw_stream_get_current_formation(struct snd_oxfw *oxfw,
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enum avc_general_plug_dir dir,
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struct snd_oxfw_stream_formation *formation)
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{
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u8 *format;
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unsigned int len;
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int err;
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len = AVC_GENERIC_FRAME_MAXIMUM_BYTES;
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format = kmalloc(len, GFP_KERNEL);
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if (format == NULL)
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return -ENOMEM;
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err = avc_stream_get_format_single(oxfw->unit, dir, 0, format, &len);
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if (err < 0)
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goto end;
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if (len < 3) {
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err = -EIO;
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goto end;
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}
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err = snd_oxfw_stream_parse_format(format, formation);
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end:
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kfree(format);
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return err;
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}
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/*
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* See Table 6.16 - AM824 Stream Format
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* Figure 6.19 - format_information field for AM824 Compound
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* in AV/C Stream Format Information Specification 1.1 (Apr 2005, 1394TA)
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* Also 'Clause 12 AM824 sequence adaption layers' in IEC 61883-6:2005
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*/
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int snd_oxfw_stream_parse_format(u8 *format,
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struct snd_oxfw_stream_formation *formation)
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{
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unsigned int i, e, channels, type;
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memset(formation, 0, sizeof(struct snd_oxfw_stream_formation));
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/*
|
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* this module can support a hierarchy combination that:
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* Root: Audio and Music (0x90)
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* Level 1: AM824 Compound (0x40)
|
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*/
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if ((format[0] != 0x90) || (format[1] != 0x40))
|
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return -ENOSYS;
|
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|
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/* check the sampling rate */
|
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for (i = 0; i < ARRAY_SIZE(avc_stream_rate_table); i++) {
|
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if (format[2] == avc_stream_rate_table[i])
|
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break;
|
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}
|
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if (i == ARRAY_SIZE(avc_stream_rate_table))
|
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return -ENOSYS;
|
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|
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formation->rate = oxfw_rate_table[i];
|
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|
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for (e = 0; e < format[4]; e++) {
|
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channels = format[5 + e * 2];
|
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type = format[6 + e * 2];
|
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|
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switch (type) {
|
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/* IEC 60958 Conformant, currently handled as MBLA */
|
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case 0x00:
|
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/* Multi Bit Linear Audio (Raw) */
|
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case 0x06:
|
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formation->pcm += channels;
|
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break;
|
||
/* MIDI Conformant */
|
||
case 0x0d:
|
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formation->midi = channels;
|
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break;
|
||
/* IEC 61937-3 to 7 */
|
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case 0x01:
|
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case 0x02:
|
||
case 0x03:
|
||
case 0x04:
|
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case 0x05:
|
||
/* Multi Bit Linear Audio */
|
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case 0x07: /* DVD-Audio */
|
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case 0x0c: /* High Precision */
|
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/* One Bit Audio */
|
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case 0x08: /* (Plain) Raw */
|
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case 0x09: /* (Plain) SACD */
|
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case 0x0a: /* (Encoded) Raw */
|
||
case 0x0b: /* (Encoded) SACD */
|
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/* SMPTE Time-Code conformant */
|
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case 0x0e:
|
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/* Sample Count */
|
||
case 0x0f:
|
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/* Anciliary Data */
|
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case 0x10:
|
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/* Synchronization Stream (Stereo Raw audio) */
|
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case 0x40:
|
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/* Don't care */
|
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case 0xff:
|
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default:
|
||
return -ENOSYS; /* not supported */
|
||
}
|
||
}
|
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|
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if (formation->pcm > AM824_MAX_CHANNELS_FOR_PCM ||
|
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formation->midi > AM824_MAX_CHANNELS_FOR_MIDI)
|
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return -ENOSYS;
|
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|
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return 0;
|
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}
|
||
|
||
static int
|
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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 == -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] = 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 = -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);
|
||
}
|