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 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_free(struct snd_tscm *tscm) 89 { 90 snd_tscm_transaction_unregister(tscm); 91 snd_tscm_stream_destroy_duplex(tscm); 92 93 fw_unit_put(tscm->unit); 94 95 mutex_destroy(&tscm->mutex); 96 } 97 98 static void tscm_card_free(struct snd_card *card) 99 { 100 tscm_free(card->private_data); 101 } 102 103 static void do_registration(struct work_struct *work) 104 { 105 struct snd_tscm *tscm = container_of(work, struct snd_tscm, dwork.work); 106 int err; 107 108 err = snd_card_new(&tscm->unit->device, -1, NULL, THIS_MODULE, 0, 109 &tscm->card); 110 if (err < 0) 111 return; 112 113 err = identify_model(tscm); 114 if (err < 0) 115 goto error; 116 117 err = snd_tscm_transaction_register(tscm); 118 if (err < 0) 119 goto error; 120 121 err = snd_tscm_stream_init_duplex(tscm); 122 if (err < 0) 123 goto error; 124 125 snd_tscm_proc_init(tscm); 126 127 err = snd_tscm_create_pcm_devices(tscm); 128 if (err < 0) 129 goto error; 130 131 err = snd_tscm_create_midi_devices(tscm); 132 if (err < 0) 133 goto error; 134 135 err = snd_tscm_create_hwdep_device(tscm); 136 if (err < 0) 137 goto error; 138 139 err = snd_card_register(tscm->card); 140 if (err < 0) 141 goto error; 142 143 /* 144 * After registered, tscm instance can be released corresponding to 145 * releasing the sound card instance. 146 */ 147 tscm->card->private_free = tscm_card_free; 148 tscm->card->private_data = tscm; 149 tscm->registered = true; 150 151 return; 152 error: 153 snd_tscm_transaction_unregister(tscm); 154 snd_tscm_stream_destroy_duplex(tscm); 155 snd_card_free(tscm->card); 156 dev_info(&tscm->unit->device, 157 "Sound card registration failed: %d\n", err); 158 } 159 160 static int snd_tscm_probe(struct fw_unit *unit, 161 const struct ieee1394_device_id *entry) 162 { 163 struct snd_tscm *tscm; 164 165 /* Allocate this independent of sound card instance. */ 166 tscm = kzalloc(sizeof(struct snd_tscm), GFP_KERNEL); 167 if (tscm == NULL) 168 return -ENOMEM; 169 170 /* initialize myself */ 171 tscm->unit = fw_unit_get(unit); 172 dev_set_drvdata(&unit->device, tscm); 173 174 mutex_init(&tscm->mutex); 175 spin_lock_init(&tscm->lock); 176 init_waitqueue_head(&tscm->hwdep_wait); 177 178 /* Allocate and register this sound card later. */ 179 INIT_DEFERRABLE_WORK(&tscm->dwork, do_registration); 180 snd_fw_schedule_registration(unit, &tscm->dwork); 181 182 return 0; 183 } 184 185 static void snd_tscm_update(struct fw_unit *unit) 186 { 187 struct snd_tscm *tscm = dev_get_drvdata(&unit->device); 188 189 /* Postpone a workqueue for deferred registration. */ 190 if (!tscm->registered) 191 snd_fw_schedule_registration(unit, &tscm->dwork); 192 193 snd_tscm_transaction_reregister(tscm); 194 195 /* 196 * After registration, userspace can start packet streaming, then this 197 * code block works fine. 198 */ 199 if (tscm->registered) { 200 mutex_lock(&tscm->mutex); 201 snd_tscm_stream_update_duplex(tscm); 202 mutex_unlock(&tscm->mutex); 203 } 204 } 205 206 static void snd_tscm_remove(struct fw_unit *unit) 207 { 208 struct snd_tscm *tscm = dev_get_drvdata(&unit->device); 209 210 /* 211 * Confirm to stop the work for registration before the sound card is 212 * going to be released. The work is not scheduled again because bus 213 * reset handler is not called anymore. 214 */ 215 cancel_delayed_work_sync(&tscm->dwork); 216 217 if (tscm->registered) { 218 /* No need to wait for releasing card object in this context. */ 219 snd_card_free_when_closed(tscm->card); 220 } else { 221 /* Don't forget this case. */ 222 tscm_free(tscm); 223 } 224 } 225 226 static const struct ieee1394_device_id snd_tscm_id_table[] = { 227 { 228 .match_flags = IEEE1394_MATCH_VENDOR_ID | 229 IEEE1394_MATCH_SPECIFIER_ID, 230 .vendor_id = 0x00022e, 231 .specifier_id = 0x00022e, 232 }, 233 /* FE-08 requires reverse-engineering because it just has faders. */ 234 {} 235 }; 236 MODULE_DEVICE_TABLE(ieee1394, snd_tscm_id_table); 237 238 static struct fw_driver tscm_driver = { 239 .driver = { 240 .owner = THIS_MODULE, 241 .name = "snd-firewire-tascam", 242 .bus = &fw_bus_type, 243 }, 244 .probe = snd_tscm_probe, 245 .update = snd_tscm_update, 246 .remove = snd_tscm_remove, 247 .id_table = snd_tscm_id_table, 248 }; 249 250 static int __init snd_tscm_init(void) 251 { 252 return driver_register(&tscm_driver.driver); 253 } 254 255 static void __exit snd_tscm_exit(void) 256 { 257 driver_unregister(&tscm_driver.driver); 258 } 259 260 module_init(snd_tscm_init); 261 module_exit(snd_tscm_exit); 262