1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * tascam.c - a part of driver for TASCAM FireWire series 4 * 5 * Copyright (c) 2015 Takashi Sakamoto 6 */ 7 8 #include "tascam.h" 9 10 MODULE_DESCRIPTION("TASCAM FireWire series Driver"); 11 MODULE_AUTHOR("Takashi Sakamoto <o-takashi@sakamocchi.jp>"); 12 MODULE_LICENSE("GPL v2"); 13 14 static const struct snd_tscm_spec model_specs[] = { 15 { 16 .name = "FW-1884", 17 .has_adat = true, 18 .has_spdif = true, 19 .pcm_capture_analog_channels = 8, 20 .pcm_playback_analog_channels = 8, 21 .midi_capture_ports = 4, 22 .midi_playback_ports = 4, 23 }, 24 { 25 .name = "FW-1082", 26 .has_adat = false, 27 .has_spdif = true, 28 .pcm_capture_analog_channels = 8, 29 .pcm_playback_analog_channels = 2, 30 .midi_capture_ports = 2, 31 .midi_playback_ports = 2, 32 }, 33 { 34 .name = "FW-1804", 35 .has_adat = true, 36 .has_spdif = true, 37 .pcm_capture_analog_channels = 8, 38 .pcm_playback_analog_channels = 2, 39 .midi_capture_ports = 2, 40 .midi_playback_ports = 4, 41 }, 42 }; 43 44 static int identify_model(struct snd_tscm *tscm) 45 { 46 struct fw_device *fw_dev = fw_parent_device(tscm->unit); 47 const u32 *config_rom = fw_dev->config_rom; 48 char model[9]; 49 unsigned int i; 50 u8 c; 51 52 if (fw_dev->config_rom_length < 30) { 53 dev_err(&tscm->unit->device, 54 "Configuration ROM is too short.\n"); 55 return -ENODEV; 56 } 57 58 /* Pick up model name from certain addresses. */ 59 for (i = 0; i < 8; i++) { 60 c = config_rom[28 + i / 4] >> (24 - 8 * (i % 4)); 61 if (c == '\0') 62 break; 63 model[i] = c; 64 } 65 model[i] = '\0'; 66 67 for (i = 0; i < ARRAY_SIZE(model_specs); i++) { 68 if (strcmp(model, model_specs[i].name) == 0) { 69 tscm->spec = &model_specs[i]; 70 break; 71 } 72 } 73 if (tscm->spec == NULL) 74 return -ENODEV; 75 76 strcpy(tscm->card->driver, "FW-TASCAM"); 77 strcpy(tscm->card->shortname, model); 78 strcpy(tscm->card->mixername, model); 79 snprintf(tscm->card->longname, sizeof(tscm->card->longname), 80 "TASCAM %s, GUID %08x%08x at %s, S%d", model, 81 fw_dev->config_rom[3], fw_dev->config_rom[4], 82 dev_name(&tscm->unit->device), 100 << fw_dev->max_speed); 83 84 return 0; 85 } 86 87 static void tscm_card_free(struct snd_card *card) 88 { 89 struct snd_tscm *tscm = card->private_data; 90 91 snd_tscm_transaction_unregister(tscm); 92 snd_tscm_stream_destroy_duplex(tscm); 93 } 94 95 static void do_registration(struct work_struct *work) 96 { 97 struct snd_tscm *tscm = container_of(work, struct snd_tscm, dwork.work); 98 int err; 99 100 err = snd_card_new(&tscm->unit->device, -1, NULL, THIS_MODULE, 0, 101 &tscm->card); 102 if (err < 0) 103 return; 104 tscm->card->private_free = tscm_card_free; 105 tscm->card->private_data = tscm; 106 107 err = identify_model(tscm); 108 if (err < 0) 109 goto error; 110 111 err = snd_tscm_transaction_register(tscm); 112 if (err < 0) 113 goto error; 114 115 err = snd_tscm_stream_init_duplex(tscm); 116 if (err < 0) 117 goto error; 118 119 snd_tscm_proc_init(tscm); 120 121 err = snd_tscm_create_pcm_devices(tscm); 122 if (err < 0) 123 goto error; 124 125 err = snd_tscm_create_midi_devices(tscm); 126 if (err < 0) 127 goto error; 128 129 err = snd_tscm_create_hwdep_device(tscm); 130 if (err < 0) 131 goto error; 132 133 err = snd_card_register(tscm->card); 134 if (err < 0) 135 goto error; 136 137 tscm->registered = true; 138 139 return; 140 error: 141 snd_card_free(tscm->card); 142 dev_info(&tscm->unit->device, 143 "Sound card registration failed: %d\n", err); 144 } 145 146 static int snd_tscm_probe(struct fw_unit *unit, 147 const struct ieee1394_device_id *entry) 148 { 149 struct snd_tscm *tscm; 150 151 /* Allocate this independent of sound card instance. */ 152 tscm = devm_kzalloc(&unit->device, sizeof(struct snd_tscm), GFP_KERNEL); 153 if (!tscm) 154 return -ENOMEM; 155 tscm->unit = fw_unit_get(unit); 156 dev_set_drvdata(&unit->device, tscm); 157 158 mutex_init(&tscm->mutex); 159 spin_lock_init(&tscm->lock); 160 init_waitqueue_head(&tscm->hwdep_wait); 161 162 /* Allocate and register this sound card later. */ 163 INIT_DEFERRABLE_WORK(&tscm->dwork, do_registration); 164 snd_fw_schedule_registration(unit, &tscm->dwork); 165 166 return 0; 167 } 168 169 static void snd_tscm_update(struct fw_unit *unit) 170 { 171 struct snd_tscm *tscm = dev_get_drvdata(&unit->device); 172 173 /* Postpone a workqueue for deferred registration. */ 174 if (!tscm->registered) 175 snd_fw_schedule_registration(unit, &tscm->dwork); 176 177 snd_tscm_transaction_reregister(tscm); 178 179 /* 180 * After registration, userspace can start packet streaming, then this 181 * code block works fine. 182 */ 183 if (tscm->registered) { 184 mutex_lock(&tscm->mutex); 185 snd_tscm_stream_update_duplex(tscm); 186 mutex_unlock(&tscm->mutex); 187 } 188 } 189 190 static void snd_tscm_remove(struct fw_unit *unit) 191 { 192 struct snd_tscm *tscm = dev_get_drvdata(&unit->device); 193 194 /* 195 * Confirm to stop the work for registration before the sound card is 196 * going to be released. The work is not scheduled again because bus 197 * reset handler is not called anymore. 198 */ 199 cancel_delayed_work_sync(&tscm->dwork); 200 201 if (tscm->registered) { 202 // Block till all of ALSA character devices are released. 203 snd_card_free(tscm->card); 204 } 205 206 mutex_destroy(&tscm->mutex); 207 fw_unit_put(tscm->unit); 208 } 209 210 static const struct ieee1394_device_id snd_tscm_id_table[] = { 211 { 212 .match_flags = IEEE1394_MATCH_VENDOR_ID | 213 IEEE1394_MATCH_SPECIFIER_ID, 214 .vendor_id = 0x00022e, 215 .specifier_id = 0x00022e, 216 }, 217 /* FE-08 requires reverse-engineering because it just has faders. */ 218 {} 219 }; 220 MODULE_DEVICE_TABLE(ieee1394, snd_tscm_id_table); 221 222 static struct fw_driver tscm_driver = { 223 .driver = { 224 .owner = THIS_MODULE, 225 .name = "snd-firewire-tascam", 226 .bus = &fw_bus_type, 227 }, 228 .probe = snd_tscm_probe, 229 .update = snd_tscm_update, 230 .remove = snd_tscm_remove, 231 .id_table = snd_tscm_id_table, 232 }; 233 234 static int __init snd_tscm_init(void) 235 { 236 return driver_register(&tscm_driver.driver); 237 } 238 239 static void __exit snd_tscm_exit(void) 240 { 241 driver_unregister(&tscm_driver.driver); 242 } 243 244 module_init(snd_tscm_init); 245 module_exit(snd_tscm_exit); 246