sound/firewire/fireworks/fireworks_stream.c

   1 /*
   2  * fireworks_stream.c - a part of driver for Fireworks based devices
   3  *
   4  * Copyright (c) 2013-2014 Takashi Sakamoto
   5  *
   6  * Licensed under the terms of the GNU General Public License, version 2.
   7  */
   8 #include "./fireworks.h"
   9
  10 #define CALLBACK_TIMEOUT        100
  11
  12 static int
  13 init_stream(struct snd_efw *efw, struct amdtp_stream *stream)
  14 {
  15         struct cmp_connection *conn;
  16         enum cmp_direction c_dir;
  17         enum amdtp_stream_direction s_dir;
  18         int err;
  19
  20         if (stream == &efw->tx_stream) {
  21                 conn = &efw->out_conn;
  22                 c_dir = CMP_OUTPUT;
  23                 s_dir = AMDTP_IN_STREAM;
  24         } else {
  25                 conn = &efw->in_conn;
  26                 c_dir = CMP_INPUT;
  27                 s_dir = AMDTP_OUT_STREAM;
  28         }
  29
  30         err = cmp_connection_init(conn, efw->unit, c_dir, 0);
  31         if (err < 0)
  32                 goto end;
  33
  34         err = amdtp_am824_init(stream, efw->unit, s_dir, CIP_BLOCKING);
  35         if (err < 0) {
  36                 amdtp_stream_destroy(stream);
  37                 cmp_connection_destroy(conn);
  38         }
  39 end:
  40         return err;
  41 }
  42
  43 static void
  44 stop_stream(struct snd_efw *efw, struct amdtp_stream *stream)
  45 {
  46         amdtp_stream_pcm_abort(stream);
  47         amdtp_stream_stop(stream);
  48
  49         if (stream == &efw->tx_stream)
  50                 cmp_connection_break(&efw->out_conn);
  51         else
  52                 cmp_connection_break(&efw->in_conn);
  53 }
  54
  55 static int
  56 start_stream(struct snd_efw *efw, struct amdtp_stream *stream,
  57              unsigned int sampling_rate)
  58 {
  59         struct cmp_connection *conn;
  60         unsigned int mode, pcm_channels, midi_ports;
  61         int err;
  62
  63         err = snd_efw_get_multiplier_mode(sampling_rate, &mode);
  64         if (err < 0)
  65                 goto end;
  66         if (stream == &efw->tx_stream) {
  67                 conn = &efw->out_conn;
  68                 pcm_channels = efw->pcm_capture_channels[mode];
  69                 midi_ports = efw->midi_out_ports;
  70         } else {
  71                 conn = &efw->in_conn;
  72                 pcm_channels = efw->pcm_playback_channels[mode];
  73                 midi_ports = efw->midi_in_ports;
  74         }
  75
  76         err = amdtp_am824_set_parameters(stream, sampling_rate,
  77                                          pcm_channels, midi_ports, false);
  78         if (err < 0)
  79                 goto end;
  80
  81         /*  establish connection via CMP */
  82         err = cmp_connection_establish(conn,
  83                                 amdtp_stream_get_max_payload(stream));
  84         if (err < 0)
  85                 goto end;
  86
  87         /* start amdtp stream */
  88         err = amdtp_stream_start(stream,
  89                                  conn->resources.channel,
  90                                  conn->speed);
  91         if (err < 0) {
  92                 stop_stream(efw, stream);
  93                 goto end;
  94         }
  95
  96         /* wait first callback */
  97         if (!amdtp_stream_wait_callback(stream, CALLBACK_TIMEOUT)) {
  98                 stop_stream(efw, stream);
  99                 err = -ETIMEDOUT;
 100         }
 101 end:
 102         return err;
 103 }
 104
 105 /*
 106  * This function should be called before starting the stream or after stopping
 107  * the streams.
 108  */
 109 static void
 110 destroy_stream(struct snd_efw *efw, struct amdtp_stream *stream)
 111 {
 112         struct cmp_connection *conn;
 113
 114         if (stream == &efw->tx_stream)
 115                 conn = &efw->out_conn;
 116         else
 117                 conn = &efw->in_conn;
 118
 119         amdtp_stream_destroy(stream);
 120         cmp_connection_destroy(&efw->out_conn);
 121 }
 122
 123 static int
 124 check_connection_used_by_others(struct snd_efw *efw, struct amdtp_stream *s)
 125 {
 126         struct cmp_connection *conn;
 127         bool used;
 128         int err;
 129
 130         if (s == &efw->tx_stream)
 131                 conn = &efw->out_conn;
 132         else
 133                 conn = &efw->in_conn;
 134
 135         err = cmp_connection_check_used(conn, &used);
 136         if ((err >= 0) && used && !amdtp_stream_running(s)) {
 137                 dev_err(&efw->unit->device,
 138                         "Connection established by others: %cPCR[%d]\n",
 139                         (conn->direction == CMP_OUTPUT) ? 'o' : 'i',
 140                         conn->pcr_index);
 141                 err = -EBUSY;
 142         }
 143
 144         return err;
 145 }
 146
 147 int snd_efw_stream_init_duplex(struct snd_efw *efw)
 148 {
 149         int err;
 150
 151         err = init_stream(efw, &efw->tx_stream);
 152         if (err < 0)
 153                 goto end;
 154         /* Fireworks transmits NODATA packets with TAG0. */
 155         efw->tx_stream.flags |= CIP_EMPTY_WITH_TAG0;
 156         /* Fireworks has its own meaning for dbc. */
 157         efw->tx_stream.flags |= CIP_DBC_IS_END_EVENT;
 158         /* Fireworks reset dbc at bus reset. */
 159         efw->tx_stream.flags |= CIP_SKIP_DBC_ZERO_CHECK;
 160         /*
 161          * But Recent firmwares starts packets with non-zero dbc.
 162          * Driver version 5.7.6 installs firmware version 5.7.3.
 163          */
 164         if (efw->is_fireworks3 &&
 165             (efw->firmware_version == 0x5070000 ||
 166              efw->firmware_version == 0x5070300 ||
 167              efw->firmware_version == 0x5080000))
 168                 efw->tx_stream.tx_first_dbc = 0x02;
 169         /* AudioFire9 always reports wrong dbs. */
 170         if (efw->is_af9)
 171                 efw->tx_stream.flags |= CIP_WRONG_DBS;
 172         /* Firmware version 5.5 reports fixed interval for dbc. */
 173         if (efw->firmware_version == 0x5050000)
 174                 efw->tx_stream.tx_dbc_interval = 8;
 175
 176         err = init_stream(efw, &efw->rx_stream);
 177         if (err < 0) {
 178                 destroy_stream(efw, &efw->tx_stream);
 179                 goto end;
 180         }
 181
 182         /* set IEC61883 compliant mode (actually not fully compliant...) */
 183         err = snd_efw_command_set_tx_mode(efw, SND_EFW_TRANSPORT_MODE_IEC61883);
 184         if (err < 0) {
 185                 destroy_stream(efw, &efw->tx_stream);
 186                 destroy_stream(efw, &efw->rx_stream);
 187         }
 188 end:
 189         return err;
 190 }
 191
 192 int snd_efw_stream_start_duplex(struct snd_efw *efw, unsigned int rate)
 193 {
 194         unsigned int curr_rate;
 195         int err = 0;
 196
 197         /* Need no substreams */
 198         if (efw->playback_substreams == 0 && efw->capture_substreams  == 0)
 199                 goto end;
 200
 201         /*
 202          * Considering JACK/FFADO streaming:
 203          * TODO: This can be removed hwdep functionality becomes popular.
 204          */
 205         err = check_connection_used_by_others(efw, &efw->rx_stream);
 206         if (err < 0)
 207                 goto end;
 208
 209         /* packet queueing error */
 210         if (amdtp_streaming_error(&efw->tx_stream))
 211                 stop_stream(efw, &efw->tx_stream);
 212         if (amdtp_streaming_error(&efw->rx_stream))
 213                 stop_stream(efw, &efw->rx_stream);
 214
 215         /* stop streams if rate is different */
 216         err = snd_efw_command_get_sampling_rate(efw, &curr_rate);
 217         if (err < 0)
 218                 goto end;
 219         if (rate == 0)
 220                 rate = curr_rate;
 221         if (rate != curr_rate) {
 222                 stop_stream(efw, &efw->tx_stream);
 223                 stop_stream(efw, &efw->rx_stream);
 224         }
 225
 226         /* master should be always running */
 227         if (!amdtp_stream_running(&efw->rx_stream)) {
 228                 err = snd_efw_command_set_sampling_rate(efw, rate);
 229                 if (err < 0)
 230                         goto end;
 231
 232                 err = start_stream(efw, &efw->rx_stream, rate);
 233                 if (err < 0) {
 234                         dev_err(&efw->unit->device,
 235                                 "fail to start AMDTP master stream:%d\n", err);
 236                         goto end;
 237                 }
 238         }
 239
 240         /* start slave if needed */
 241         if (efw->capture_substreams > 0 &&
 242             !amdtp_stream_running(&efw->tx_stream)) {
 243                 err = start_stream(efw, &efw->tx_stream, rate);
 244                 if (err < 0) {
 245                         dev_err(&efw->unit->device,
 246                                 "fail to start AMDTP slave stream:%d\n", err);
 247                         stop_stream(efw, &efw->rx_stream);
 248                 }
 249         }
 250 end:
 251         return err;
 252 }
 253
 254 void snd_efw_stream_stop_duplex(struct snd_efw *efw)
 255 {
 256         if (efw->capture_substreams == 0) {
 257                 stop_stream(efw, &efw->tx_stream);
 258
 259                 if (efw->playback_substreams == 0)
 260                         stop_stream(efw, &efw->rx_stream);
 261         }
 262 }
 263
 264 void snd_efw_stream_update_duplex(struct snd_efw *efw)
 265 {
 266         if (cmp_connection_update(&efw->out_conn) < 0 ||
 267             cmp_connection_update(&efw->in_conn) < 0) {
 268                 stop_stream(efw, &efw->rx_stream);
 269                 stop_stream(efw, &efw->tx_stream);
 270         } else {
 271                 amdtp_stream_update(&efw->rx_stream);
 272                 amdtp_stream_update(&efw->tx_stream);
 273         }
 274 }
 275
 276 void snd_efw_stream_destroy_duplex(struct snd_efw *efw)
 277 {
 278         destroy_stream(efw, &efw->rx_stream);
 279         destroy_stream(efw, &efw->tx_stream);
 280 }
 281
 282 void snd_efw_stream_lock_changed(struct snd_efw *efw)
 283 {
 284         efw->dev_lock_changed = true;
 285         wake_up(&efw->hwdep_wait);
 286 }
 287
 288 int snd_efw_stream_lock_try(struct snd_efw *efw)
 289 {
 290         int err;
 291
 292         spin_lock_irq(&efw->lock);
 293
 294         /* user land lock this */
 295         if (efw->dev_lock_count < 0) {
 296                 err = -EBUSY;
 297                 goto end;
 298         }
 299
 300         /* this is the first time */
 301         if (efw->dev_lock_count++ == 0)
 302                 snd_efw_stream_lock_changed(efw);
 303         err = 0;
 304 end:
 305         spin_unlock_irq(&efw->lock);
 306         return err;
 307 }
 308
 309 void snd_efw_stream_lock_release(struct snd_efw *efw)
 310 {
 311         spin_lock_irq(&efw->lock);
 312
 313         if (WARN_ON(efw->dev_lock_count <= 0))
 314                 goto end;
 315         if (--efw->dev_lock_count == 0)
 316                 snd_efw_stream_lock_changed(efw);
 317 end:
 318         spin_unlock_irq(&efw->lock);
 319 }