sound/firewire/tascam/tascam.c

   1 /*
   2  * tascam.c - a part of driver for TASCAM FireWire series
   3  *
   4  * Copyright (c) 2015 Takashi Sakamoto
   5  *
   6  * Licensed under the terms of the GNU General Public License, version 2.
   7  */
   8
   9 #include "tascam.h"
  10
  11 MODULE_DESCRIPTION("TASCAM FireWire series Driver");
  12 MODULE_AUTHOR("Takashi Sakamoto <o-takashi@sakamocchi.jp>");
  13 MODULE_LICENSE("GPL v2");
  14
  15 static const struct snd_tscm_spec model_specs[] = {
  16         {
  17                 .name = "FW-1884",
  18                 .has_adat = true,
  19                 .has_spdif = true,
  20                 .pcm_capture_analog_channels = 8,
  21                 .pcm_playback_analog_channels = 8,
  22                 .midi_capture_ports = 4,
  23                 .midi_playback_ports = 4,
  24         },
  25         {
  26                 .name = "FW-1082",
  27                 .has_adat = false,
  28                 .has_spdif = true,
  29                 .pcm_capture_analog_channels = 8,
  30                 .pcm_playback_analog_channels = 2,
  31                 .midi_capture_ports = 2,
  32                 .midi_playback_ports = 2,
  33         },
  34         {
  35                 .name = "FW-1804",
  36                 .has_adat = true,
  37                 .has_spdif = true,
  38                 .pcm_capture_analog_channels = 8,
  39                 .pcm_playback_analog_channels = 2,
  40                 .midi_capture_ports = 2,
  41                 .midi_playback_ports = 4,
  42         },
  43 };
  44
  45 static int identify_model(struct snd_tscm *tscm)
  46 {
  47         struct fw_device *fw_dev = fw_parent_device(tscm->unit);
  48         const u32 *config_rom = fw_dev->config_rom;
  49         char model[9];
  50         unsigned int i;
  51         u8 c;
  52
  53         if (fw_dev->config_rom_length < 30) {
  54                 dev_err(&tscm->unit->device,
  55                         "Configuration ROM is too short.\n");
  56                 return -ENODEV;
  57         }
  58
  59         /* Pick up model name from certain addresses. */
  60         for (i = 0; i < 8; i++) {
  61                 c = config_rom[28 + i / 4] >> (24 - 8 * (i % 4));
  62                 if (c == '\0')
  63                         break;
  64                 model[i] = c;
  65         }
  66         model[i] = '\0';
  67
  68         for (i = 0; i < ARRAY_SIZE(model_specs); i++) {
  69                 if (strcmp(model, model_specs[i].name) == 0) {
  70                         tscm->spec = &model_specs[i];
  71                         break;
  72                 }
  73         }
  74         if (tscm->spec == NULL)
  75                 return -ENODEV;
  76
  77         strcpy(tscm->card->driver, "FW-TASCAM");
  78         strcpy(tscm->card->shortname, model);
  79         strcpy(tscm->card->mixername, model);
  80         snprintf(tscm->card->longname, sizeof(tscm->card->longname),
  81                  "TASCAM %s, GUID %08x%08x at %s, S%d", model,
  82                  fw_dev->config_rom[3], fw_dev->config_rom[4],
  83                  dev_name(&tscm->unit->device), 100 << fw_dev->max_speed);
  84
  85         return 0;
  86 }
  87
  88 static void tscm_card_free(struct snd_card *card)
  89 {
  90         struct snd_tscm *tscm = card->private_data;
  91
  92         snd_tscm_transaction_unregister(tscm);
  93         snd_tscm_stream_destroy_duplex(tscm);
  94 }
  95
  96 static void do_registration(struct work_struct *work)
  97 {
  98         struct snd_tscm *tscm = container_of(work, struct snd_tscm, dwork.work);
  99         int err;
 100
 101         err = snd_card_new(&tscm->unit->device, -1, NULL, THIS_MODULE, 0,
 102                            &tscm->card);
 103         if (err < 0)
 104                 return;
 105         tscm->card->private_free = tscm_card_free;
 106         tscm->card->private_data = tscm;
 107
 108         err = identify_model(tscm);
 109         if (err < 0)
 110                 goto error;
 111
 112         err = snd_tscm_transaction_register(tscm);
 113         if (err < 0)
 114                 goto error;
 115
 116         err = snd_tscm_stream_init_duplex(tscm);
 117         if (err < 0)
 118                 goto error;
 119
 120         snd_tscm_proc_init(tscm);
 121
 122         err = snd_tscm_create_pcm_devices(tscm);
 123         if (err < 0)
 124                 goto error;
 125
 126         err = snd_tscm_create_midi_devices(tscm);
 127         if (err < 0)
 128                 goto error;
 129
 130         err = snd_tscm_create_hwdep_device(tscm);
 131         if (err < 0)
 132                 goto error;
 133
 134         err = snd_card_register(tscm->card);
 135         if (err < 0)
 136                 goto error;
 137
 138         tscm->registered = true;
 139
 140         return;
 141 error:
 142         snd_card_free(tscm->card);
 143         dev_info(&tscm->unit->device,
 144                  "Sound card registration failed: %d\n", err);
 145 }
 146
 147 static int snd_tscm_probe(struct fw_unit *unit,
 148                            const struct ieee1394_device_id *entry)
 149 {
 150         struct snd_tscm *tscm;
 151
 152         /* Allocate this independent of sound card instance. */
 153         tscm = devm_kzalloc(&unit->device, sizeof(struct snd_tscm), GFP_KERNEL);
 154         if (!tscm)
 155                 return -ENOMEM;
 156         tscm->unit = fw_unit_get(unit);
 157         dev_set_drvdata(&unit->device, tscm);
 158
 159         mutex_init(&tscm->mutex);
 160         spin_lock_init(&tscm->lock);
 161         init_waitqueue_head(&tscm->hwdep_wait);
 162
 163         /* Allocate and register this sound card later. */
 164         INIT_DEFERRABLE_WORK(&tscm->dwork, do_registration);
 165         snd_fw_schedule_registration(unit, &tscm->dwork);
 166
 167         return 0;
 168 }
 169
 170 static void snd_tscm_update(struct fw_unit *unit)
 171 {
 172         struct snd_tscm *tscm = dev_get_drvdata(&unit->device);
 173
 174         /* Postpone a workqueue for deferred registration. */
 175         if (!tscm->registered)
 176                 snd_fw_schedule_registration(unit, &tscm->dwork);
 177
 178         snd_tscm_transaction_reregister(tscm);
 179
 180         /*
 181          * After registration, userspace can start packet streaming, then this
 182          * code block works fine.
 183          */
 184         if (tscm->registered) {
 185                 mutex_lock(&tscm->mutex);
 186                 snd_tscm_stream_update_duplex(tscm);
 187                 mutex_unlock(&tscm->mutex);
 188         }
 189 }
 190
 191 static void snd_tscm_remove(struct fw_unit *unit)
 192 {
 193         struct snd_tscm *tscm = dev_get_drvdata(&unit->device);
 194
 195         /*
 196          * Confirm to stop the work for registration before the sound card is
 197          * going to be released. The work is not scheduled again because bus
 198          * reset handler is not called anymore.
 199          */
 200         cancel_delayed_work_sync(&tscm->dwork);
 201
 202         if (tscm->registered) {
 203                 // Block till all of ALSA character devices are released.
 204                 snd_card_free(tscm->card);
 205         }
 206
 207         mutex_destroy(&tscm->mutex);
 208         fw_unit_put(tscm->unit);
 209 }
 210
 211 static const struct ieee1394_device_id snd_tscm_id_table[] = {
 212         {
 213                 .match_flags = IEEE1394_MATCH_VENDOR_ID |
 214                                IEEE1394_MATCH_SPECIFIER_ID,
 215                 .vendor_id = 0x00022e,
 216                 .specifier_id = 0x00022e,
 217         },
 218         /* FE-08 requires reverse-engineering because it just has faders. */
 219         {}
 220 };
 221 MODULE_DEVICE_TABLE(ieee1394, snd_tscm_id_table);
 222
 223 static struct fw_driver tscm_driver = {
 224         .driver = {
 225                 .owner = THIS_MODULE,
 226                 .name = "snd-firewire-tascam",
 227                 .bus = &fw_bus_type,
 228         },
 229         .probe    = snd_tscm_probe,
 230         .update   = snd_tscm_update,
 231         .remove   = snd_tscm_remove,
 232         .id_table = snd_tscm_id_table,
 233 };
 234
 235 static int __init snd_tscm_init(void)
 236 {
 237         return driver_register(&tscm_driver.driver);
 238 }
 239
 240 static void __exit snd_tscm_exit(void)
 241 {
 242         driver_unregister(&tscm_driver.driver);
 243 }
 244
 245 module_init(snd_tscm_init);
 246 module_exit(snd_tscm_exit);