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![Takashi Sakamoto](/assets/img/avatar_default.png)
When some tascam units are connected sequentially, userspace applications are involved at bus-reset state on IEEE 1394 bus. In the state, any communications can be canceled. Therefore, sound card registration should be delayed till the bus gets calm. This commit achieves it. Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Signed-off-by: Takashi Iwai <tiwai@suse.de>
261 lines
5.9 KiB
C
261 lines
5.9 KiB
C
/*
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* tascam.c - a part of driver for TASCAM FireWire series
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*
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* Copyright (c) 2015 Takashi Sakamoto
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*
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* Licensed under the terms of the GNU General Public License, version 2.
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*/
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#include "tascam.h"
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MODULE_DESCRIPTION("TASCAM FireWire series Driver");
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MODULE_AUTHOR("Takashi Sakamoto <o-takashi@sakamocchi.jp>");
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MODULE_LICENSE("GPL v2");
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static struct snd_tscm_spec model_specs[] = {
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{
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.name = "FW-1884",
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.has_adat = true,
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.has_spdif = true,
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.pcm_capture_analog_channels = 8,
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.pcm_playback_analog_channels = 8,
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.midi_capture_ports = 4,
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.midi_playback_ports = 4,
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},
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{
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.name = "FW-1082",
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.has_adat = false,
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.has_spdif = true,
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.pcm_capture_analog_channels = 8,
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.pcm_playback_analog_channels = 2,
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.midi_capture_ports = 2,
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.midi_playback_ports = 2,
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},
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{
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.name = "FW-1804",
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.has_adat = true,
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.has_spdif = true,
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.pcm_capture_analog_channels = 8,
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.pcm_playback_analog_channels = 2,
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.midi_capture_ports = 2,
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.midi_playback_ports = 4,
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},
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};
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static int identify_model(struct snd_tscm *tscm)
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{
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struct fw_device *fw_dev = fw_parent_device(tscm->unit);
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const u32 *config_rom = fw_dev->config_rom;
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char model[9];
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unsigned int i;
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u8 c;
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if (fw_dev->config_rom_length < 30) {
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dev_err(&tscm->unit->device,
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"Configuration ROM is too short.\n");
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return -ENODEV;
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}
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/* Pick up model name from certain addresses. */
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for (i = 0; i < 8; i++) {
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c = config_rom[28 + i / 4] >> (24 - 8 * (i % 4));
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if (c == '\0')
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break;
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model[i] = c;
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}
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model[i] = '\0';
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for (i = 0; i < ARRAY_SIZE(model_specs); i++) {
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if (strcmp(model, model_specs[i].name) == 0) {
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tscm->spec = &model_specs[i];
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break;
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}
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}
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if (tscm->spec == NULL)
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return -ENODEV;
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strcpy(tscm->card->driver, "FW-TASCAM");
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strcpy(tscm->card->shortname, model);
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strcpy(tscm->card->mixername, model);
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snprintf(tscm->card->longname, sizeof(tscm->card->longname),
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"TASCAM %s, GUID %08x%08x at %s, S%d", model,
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fw_dev->config_rom[3], fw_dev->config_rom[4],
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dev_name(&tscm->unit->device), 100 << fw_dev->max_speed);
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return 0;
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}
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static void tscm_free(struct snd_tscm *tscm)
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{
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snd_tscm_transaction_unregister(tscm);
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snd_tscm_stream_destroy_duplex(tscm);
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fw_unit_put(tscm->unit);
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mutex_destroy(&tscm->mutex);
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}
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static void tscm_card_free(struct snd_card *card)
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{
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tscm_free(card->private_data);
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}
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static void do_registration(struct work_struct *work)
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{
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struct snd_tscm *tscm = container_of(work, struct snd_tscm, dwork.work);
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int err;
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err = snd_card_new(&tscm->unit->device, -1, NULL, THIS_MODULE, 0,
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&tscm->card);
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if (err < 0)
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return;
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err = identify_model(tscm);
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if (err < 0)
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goto error;
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err = snd_tscm_transaction_register(tscm);
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if (err < 0)
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goto error;
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err = snd_tscm_stream_init_duplex(tscm);
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if (err < 0)
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goto error;
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snd_tscm_proc_init(tscm);
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err = snd_tscm_create_pcm_devices(tscm);
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if (err < 0)
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goto error;
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err = snd_tscm_create_midi_devices(tscm);
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if (err < 0)
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goto error;
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err = snd_tscm_create_hwdep_device(tscm);
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if (err < 0)
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goto error;
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err = snd_card_register(tscm->card);
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if (err < 0)
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goto error;
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/*
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* After registered, tscm instance can be released corresponding to
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* releasing the sound card instance.
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*/
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tscm->card->private_free = tscm_card_free;
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tscm->card->private_data = tscm;
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tscm->registered = true;
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return;
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error:
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snd_tscm_transaction_unregister(tscm);
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snd_tscm_stream_destroy_duplex(tscm);
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snd_card_free(tscm->card);
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dev_info(&tscm->unit->device,
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"Sound card registration failed: %d\n", err);
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}
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static int snd_tscm_probe(struct fw_unit *unit,
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const struct ieee1394_device_id *entry)
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{
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struct snd_tscm *tscm;
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/* Allocate this independent of sound card instance. */
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tscm = kzalloc(sizeof(struct snd_tscm), GFP_KERNEL);
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if (tscm == NULL)
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return -ENOMEM;
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/* initialize myself */
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tscm->unit = fw_unit_get(unit);
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dev_set_drvdata(&unit->device, tscm);
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mutex_init(&tscm->mutex);
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spin_lock_init(&tscm->lock);
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init_waitqueue_head(&tscm->hwdep_wait);
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/* Allocate and register this sound card later. */
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INIT_DEFERRABLE_WORK(&tscm->dwork, do_registration);
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snd_fw_schedule_registration(unit, &tscm->dwork);
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return 0;
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}
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static void snd_tscm_update(struct fw_unit *unit)
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{
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struct snd_tscm *tscm = dev_get_drvdata(&unit->device);
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/* Postpone a workqueue for deferred registration. */
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if (!tscm->registered)
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snd_fw_schedule_registration(unit, &tscm->dwork);
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snd_tscm_transaction_reregister(tscm);
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/*
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* After registration, userspace can start packet streaming, then this
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* code block works fine.
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*/
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if (tscm->registered) {
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mutex_lock(&tscm->mutex);
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snd_tscm_stream_update_duplex(tscm);
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mutex_unlock(&tscm->mutex);
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}
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}
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static void snd_tscm_remove(struct fw_unit *unit)
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{
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struct snd_tscm *tscm = dev_get_drvdata(&unit->device);
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/*
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* Confirm to stop the work for registration before the sound card is
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* going to be released. The work is not scheduled again because bus
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* reset handler is not called anymore.
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*/
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cancel_delayed_work_sync(&tscm->dwork);
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if (tscm->registered) {
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/* No need to wait for releasing card object in this context. */
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snd_card_free_when_closed(tscm->card);
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} else {
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/* Don't forget this case. */
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tscm_free(tscm);
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}
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}
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static const struct ieee1394_device_id snd_tscm_id_table[] = {
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{
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.match_flags = IEEE1394_MATCH_VENDOR_ID |
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IEEE1394_MATCH_SPECIFIER_ID,
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.vendor_id = 0x00022e,
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.specifier_id = 0x00022e,
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},
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/* FE-08 requires reverse-engineering because it just has faders. */
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{}
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};
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MODULE_DEVICE_TABLE(ieee1394, snd_tscm_id_table);
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static struct fw_driver tscm_driver = {
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.driver = {
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.owner = THIS_MODULE,
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.name = "snd-firewire-tascam",
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.bus = &fw_bus_type,
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},
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.probe = snd_tscm_probe,
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.update = snd_tscm_update,
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.remove = snd_tscm_remove,
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.id_table = snd_tscm_id_table,
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};
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static int __init snd_tscm_init(void)
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{
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return driver_register(&tscm_driver.driver);
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}
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static void __exit snd_tscm_exit(void)
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{
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driver_unregister(&tscm_driver.driver);
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}
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module_init(snd_tscm_init);
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module_exit(snd_tscm_exit);
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