215 строки
5.1 KiB
C
215 строки
5.1 KiB
C
/*
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* motu.c - a part of driver for MOTU FireWire series
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*
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* Copyright (c) 2015-2017 Takashi Sakamoto <o-takashi@sakamocchi.jp>
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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 "motu.h"
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#define OUI_MOTU 0x0001f2
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MODULE_DESCRIPTION("MOTU FireWire 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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const unsigned int snd_motu_clock_rates[SND_MOTU_CLOCK_RATE_COUNT] = {
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/* mode 0 */
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[0] = 44100,
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[1] = 48000,
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/* mode 1 */
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[2] = 88200,
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[3] = 96000,
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/* mode 2 */
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[4] = 176400,
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[5] = 192000,
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};
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static void name_card(struct snd_motu *motu)
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{
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struct fw_device *fw_dev = fw_parent_device(motu->unit);
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struct fw_csr_iterator it;
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int key, val;
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u32 version = 0;
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fw_csr_iterator_init(&it, motu->unit->directory);
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while (fw_csr_iterator_next(&it, &key, &val)) {
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switch (key) {
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case CSR_VERSION:
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version = val;
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break;
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}
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}
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strcpy(motu->card->driver, "FW-MOTU");
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strcpy(motu->card->shortname, motu->spec->name);
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strcpy(motu->card->mixername, motu->spec->name);
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snprintf(motu->card->longname, sizeof(motu->card->longname),
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"MOTU %s (version:%d), GUID %08x%08x at %s, S%d",
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motu->spec->name, version,
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fw_dev->config_rom[3], fw_dev->config_rom[4],
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dev_name(&motu->unit->device), 100 << fw_dev->max_speed);
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}
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static void motu_free(struct snd_motu *motu)
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{
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snd_motu_transaction_unregister(motu);
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snd_motu_stream_destroy_duplex(motu);
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fw_unit_put(motu->unit);
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mutex_destroy(&motu->mutex);
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kfree(motu);
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}
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/*
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* This module releases the FireWire unit data after all ALSA character devices
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* are released by applications. This is for releasing stream data or finishing
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* transactions safely. Thus at returning from .remove(), this module still keep
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* references for the unit.
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*/
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static void motu_card_free(struct snd_card *card)
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{
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motu_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_motu *motu = container_of(work, struct snd_motu, dwork.work);
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int err;
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if (motu->registered)
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return;
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err = snd_card_new(&motu->unit->device, -1, NULL, THIS_MODULE, 0,
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&motu->card);
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if (err < 0)
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return;
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name_card(motu);
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err = snd_motu_transaction_register(motu);
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if (err < 0)
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goto error;
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err = snd_motu_stream_init_duplex(motu);
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if (err < 0)
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goto error;
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err = snd_card_register(motu->card);
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if (err < 0)
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goto error;
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/*
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* After registered, motu instance can be released corresponding to
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* releasing the sound card instance.
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*/
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motu->card->private_free = motu_card_free;
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motu->card->private_data = motu;
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motu->registered = true;
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return;
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error:
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snd_motu_transaction_unregister(motu);
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snd_card_free(motu->card);
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dev_info(&motu->unit->device,
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"Sound card registration failed: %d\n", err);
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}
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static int motu_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_motu *motu;
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/* Allocate this independently of sound card instance. */
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motu = kzalloc(sizeof(struct snd_motu), GFP_KERNEL);
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if (motu == NULL)
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return -ENOMEM;
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motu->spec = (const struct snd_motu_spec *)entry->driver_data;
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motu->unit = fw_unit_get(unit);
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dev_set_drvdata(&unit->device, motu);
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mutex_init(&motu->mutex);
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/* Allocate and register this sound card later. */
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INIT_DEFERRABLE_WORK(&motu->dwork, do_registration);
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snd_fw_schedule_registration(unit, &motu->dwork);
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return 0;
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}
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static void motu_remove(struct fw_unit *unit)
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{
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struct snd_motu *motu = 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(&motu->dwork);
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if (motu->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(motu->card);
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} else {
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/* Don't forget this case. */
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motu_free(motu);
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}
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}
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static void motu_bus_update(struct fw_unit *unit)
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{
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struct snd_motu *motu = dev_get_drvdata(&unit->device);
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/* Postpone a workqueue for deferred registration. */
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if (!motu->registered)
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snd_fw_schedule_registration(unit, &motu->dwork);
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/* The handler address register becomes initialized. */
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snd_motu_transaction_reregister(motu);
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}
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#define SND_MOTU_DEV_ENTRY(model, data) \
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{ \
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.match_flags = IEEE1394_MATCH_VENDOR_ID | \
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IEEE1394_MATCH_MODEL_ID | \
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IEEE1394_MATCH_SPECIFIER_ID, \
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.vendor_id = OUI_MOTU, \
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.model_id = model, \
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.specifier_id = OUI_MOTU, \
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.driver_data = (kernel_ulong_t)data, \
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}
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static const struct ieee1394_device_id motu_id_table[] = {
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{ }
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};
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MODULE_DEVICE_TABLE(ieee1394, motu_id_table);
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static struct fw_driver motu_driver = {
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.driver = {
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.owner = THIS_MODULE,
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.name = KBUILD_MODNAME,
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.bus = &fw_bus_type,
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},
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.probe = motu_probe,
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.update = motu_bus_update,
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.remove = motu_remove,
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.id_table = motu_id_table,
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};
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static int __init alsa_motu_init(void)
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{
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return driver_register(&motu_driver.driver);
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}
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static void __exit alsa_motu_exit(void)
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{
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driver_unregister(&motu_driver.driver);
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}
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module_init(alsa_motu_init);
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module_exit(alsa_motu_exit);
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