sound/firewire/fireface/ff-stream.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * ff-stream.c - a part of driver for RME Fireface series
   4  *
   5  * Copyright (c) 2015-2017 Takashi Sakamoto
   6  */
   7
   8 #include "ff.h"
   9
  10 #define CALLBACK_TIMEOUT_MS     200
  11
  12 int snd_ff_stream_get_multiplier_mode(enum cip_sfc sfc,
  13                                       enum snd_ff_stream_mode *mode)
  14 {
  15         static const enum snd_ff_stream_mode modes[] = {
  16                 [CIP_SFC_32000] = SND_FF_STREAM_MODE_LOW,
  17                 [CIP_SFC_44100] = SND_FF_STREAM_MODE_LOW,
  18                 [CIP_SFC_48000] = SND_FF_STREAM_MODE_LOW,
  19                 [CIP_SFC_88200] = SND_FF_STREAM_MODE_MID,
  20                 [CIP_SFC_96000] = SND_FF_STREAM_MODE_MID,
  21                 [CIP_SFC_176400] = SND_FF_STREAM_MODE_HIGH,
  22                 [CIP_SFC_192000] = SND_FF_STREAM_MODE_HIGH,
  23         };
  24
  25         if (sfc >= CIP_SFC_COUNT)
  26                 return -EINVAL;
  27
  28         *mode = modes[sfc];
  29
  30         return 0;
  31 }
  32
  33 static inline void finish_session(struct snd_ff *ff)
  34 {
  35         ff->spec->protocol->finish_session(ff);
  36         ff->spec->protocol->switch_fetching_mode(ff, false);
  37 }
  38
  39 static int init_stream(struct snd_ff *ff, struct amdtp_stream *s)
  40 {
  41         struct fw_iso_resources *resources;
  42         enum amdtp_stream_direction dir;
  43         int err;
  44
  45         if (s == &ff->tx_stream) {
  46                 resources = &ff->tx_resources;
  47                 dir = AMDTP_IN_STREAM;
  48         } else {
  49                 resources = &ff->rx_resources;
  50                 dir = AMDTP_OUT_STREAM;
  51         }
  52
  53         err = fw_iso_resources_init(resources, ff->unit);
  54         if (err < 0)
  55                 return err;
  56
  57         err = amdtp_ff_init(s, ff->unit, dir);
  58         if (err < 0)
  59                 fw_iso_resources_destroy(resources);
  60
  61         return err;
  62 }
  63
  64 static void destroy_stream(struct snd_ff *ff, struct amdtp_stream *s)
  65 {
  66         amdtp_stream_destroy(s);
  67
  68         if (s == &ff->tx_stream)
  69                 fw_iso_resources_destroy(&ff->tx_resources);
  70         else
  71                 fw_iso_resources_destroy(&ff->rx_resources);
  72 }
  73
  74 int snd_ff_stream_init_duplex(struct snd_ff *ff)
  75 {
  76         int err;
  77
  78         err = init_stream(ff, &ff->rx_stream);
  79         if (err < 0)
  80                 return err;
  81
  82         err = init_stream(ff, &ff->tx_stream);
  83         if (err < 0) {
  84                 destroy_stream(ff, &ff->rx_stream);
  85                 return err;
  86         }
  87
  88         err = amdtp_domain_init(&ff->domain);
  89         if (err < 0) {
  90                 destroy_stream(ff, &ff->rx_stream);
  91                 destroy_stream(ff, &ff->tx_stream);
  92         }
  93
  94         return err;
  95 }
  96
  97 /*
  98  * This function should be called before starting streams or after stopping
  99  * streams.
 100  */
 101 void snd_ff_stream_destroy_duplex(struct snd_ff *ff)
 102 {
 103         amdtp_domain_destroy(&ff->domain);
 104
 105         destroy_stream(ff, &ff->rx_stream);
 106         destroy_stream(ff, &ff->tx_stream);
 107 }
 108
 109 int snd_ff_stream_reserve_duplex(struct snd_ff *ff, unsigned int rate,
 110                                  unsigned int frames_per_period)
 111 {
 112         unsigned int curr_rate;
 113         enum snd_ff_clock_src src;
 114         int err;
 115
 116         err = ff->spec->protocol->get_clock(ff, &curr_rate, &src);
 117         if (err < 0)
 118                 return err;
 119
 120         if (ff->substreams_counter == 0 || curr_rate != rate) {
 121                 enum snd_ff_stream_mode mode;
 122                 int i;
 123
 124                 amdtp_domain_stop(&ff->domain);
 125                 finish_session(ff);
 126
 127                 fw_iso_resources_free(&ff->tx_resources);
 128                 fw_iso_resources_free(&ff->rx_resources);
 129
 130                 for (i = 0; i < CIP_SFC_COUNT; ++i) {
 131                         if (amdtp_rate_table[i] == rate)
 132                                 break;
 133                 }
 134                 if (i >= CIP_SFC_COUNT)
 135                         return -EINVAL;
 136
 137                 err = snd_ff_stream_get_multiplier_mode(i, &mode);
 138                 if (err < 0)
 139                         return err;
 140
 141                 err = amdtp_ff_set_parameters(&ff->tx_stream, rate,
 142                                         ff->spec->pcm_capture_channels[mode]);
 143                 if (err < 0)
 144                         return err;
 145
 146                 err = amdtp_ff_set_parameters(&ff->rx_stream, rate,
 147                                         ff->spec->pcm_playback_channels[mode]);
 148                 if (err < 0)
 149                         return err;
 150
 151                 err = ff->spec->protocol->allocate_resources(ff, rate);
 152                 if (err < 0)
 153                         return err;
 154
 155                 err = amdtp_domain_set_events_per_period(&ff->domain,
 156                                                          frames_per_period, 0);
 157                 if (err < 0) {
 158                         fw_iso_resources_free(&ff->tx_resources);
 159                         fw_iso_resources_free(&ff->rx_resources);
 160                         return err;
 161                 }
 162         }
 163
 164         return 0;
 165 }
 166
 167 int snd_ff_stream_start_duplex(struct snd_ff *ff, unsigned int rate)
 168 {
 169         int err;
 170
 171         if (ff->substreams_counter == 0)
 172                 return 0;
 173
 174         if (amdtp_streaming_error(&ff->tx_stream) ||
 175             amdtp_streaming_error(&ff->rx_stream)) {
 176                 amdtp_domain_stop(&ff->domain);
 177                 finish_session(ff);
 178         }
 179
 180         /*
 181          * Regardless of current source of clock signal, drivers transfer some
 182          * packets. Then, the device transfers packets.
 183          */
 184         if (!amdtp_stream_running(&ff->rx_stream)) {
 185                 int spd = fw_parent_device(ff->unit)->max_speed;
 186
 187                 err = ff->spec->protocol->begin_session(ff, rate);
 188                 if (err < 0)
 189                         goto error;
 190
 191                 err = amdtp_domain_add_stream(&ff->domain, &ff->rx_stream,
 192                                               ff->rx_resources.channel, spd);
 193                 if (err < 0)
 194                         goto error;
 195
 196                 err = amdtp_domain_add_stream(&ff->domain, &ff->tx_stream,
 197                                               ff->tx_resources.channel, spd);
 198                 if (err < 0)
 199                         goto error;
 200
 201                 err = amdtp_domain_start(&ff->domain);
 202                 if (err < 0)
 203                         goto error;
 204
 205                 if (!amdtp_stream_wait_callback(&ff->rx_stream,
 206                                                 CALLBACK_TIMEOUT_MS) ||
 207                     !amdtp_stream_wait_callback(&ff->tx_stream,
 208                                                 CALLBACK_TIMEOUT_MS)) {
 209                         err = -ETIMEDOUT;
 210                         goto error;
 211                 }
 212
 213                 err = ff->spec->protocol->switch_fetching_mode(ff, true);
 214                 if (err < 0)
 215                         goto error;
 216         }
 217
 218         return 0;
 219 error:
 220         amdtp_domain_stop(&ff->domain);
 221         finish_session(ff);
 222
 223         return err;
 224 }
 225
 226 void snd_ff_stream_stop_duplex(struct snd_ff *ff)
 227 {
 228         if (ff->substreams_counter == 0) {
 229                 amdtp_domain_stop(&ff->domain);
 230                 finish_session(ff);
 231
 232                 fw_iso_resources_free(&ff->tx_resources);
 233                 fw_iso_resources_free(&ff->rx_resources);
 234         }
 235 }
 236
 237 void snd_ff_stream_update_duplex(struct snd_ff *ff)
 238 {
 239         amdtp_domain_stop(&ff->domain);
 240
 241         // The device discontinue to transfer packets.
 242         amdtp_stream_pcm_abort(&ff->tx_stream);
 243         amdtp_stream_pcm_abort(&ff->rx_stream);
 244 }
 245
 246 void snd_ff_stream_lock_changed(struct snd_ff *ff)
 247 {
 248         ff->dev_lock_changed = true;
 249         wake_up(&ff->hwdep_wait);
 250 }
 251
 252 int snd_ff_stream_lock_try(struct snd_ff *ff)
 253 {
 254         int err;
 255
 256         spin_lock_irq(&ff->lock);
 257
 258         /* user land lock this */
 259         if (ff->dev_lock_count < 0) {
 260                 err = -EBUSY;
 261                 goto end;
 262         }
 263
 264         /* this is the first time */
 265         if (ff->dev_lock_count++ == 0)
 266                 snd_ff_stream_lock_changed(ff);
 267         err = 0;
 268 end:
 269         spin_unlock_irq(&ff->lock);
 270         return err;
 271 }
 272
 273 void snd_ff_stream_lock_release(struct snd_ff *ff)
 274 {
 275         spin_lock_irq(&ff->lock);
 276
 277         if (WARN_ON(ff->dev_lock_count <= 0))
 278                 goto end;
 279         if (--ff->dev_lock_count == 0)
 280                 snd_ff_stream_lock_changed(ff);
 281 end:
 282         spin_unlock_irq(&ff->lock);
 283 }