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/*
* motu.c - a part of driver for MOTU FireWire series
*
* Copyright (c) 2015-2017 Takashi Sakamoto <o-takashi@sakamocchi.jp>
*
* Licensed under the terms of the GNU General Public License, version 2.
*/
#include "motu.h"
#define OUI_MOTU 0x0001f2
MODULE_DESCRIPTION("MOTU FireWire driver");
MODULE_AUTHOR("Takashi Sakamoto <o-takashi@sakamocchi.jp>");
MODULE_LICENSE("GPL v2");
const unsigned int snd_motu_clock_rates[SND_MOTU_CLOCK_RATE_COUNT] = {
/* mode 0 */
[0] = 44100,
[1] = 48000,
/* mode 1 */
[2] = 88200,
[3] = 96000,
/* mode 2 */
[4] = 176400,
[5] = 192000,
};
static void name_card(struct snd_motu *motu)
{
struct fw_device *fw_dev = fw_parent_device(motu->unit);
struct fw_csr_iterator it;
int key, val;
u32 version = 0;
fw_csr_iterator_init(&it, motu->unit->directory);
while (fw_csr_iterator_next(&it, &key, &val)) {
switch (key) {
case CSR_VERSION:
version = val;
break;
}
}
strcpy(motu->card->driver, "FW-MOTU");
strcpy(motu->card->shortname, motu->spec->name);
strcpy(motu->card->mixername, motu->spec->name);
snprintf(motu->card->longname, sizeof(motu->card->longname),
"MOTU %s (version:%d), GUID %08x%08x at %s, S%d",
motu->spec->name, version,
fw_dev->config_rom[3], fw_dev->config_rom[4],
dev_name(&motu->unit->device), 100 << fw_dev->max_speed);
}
static void motu_free(struct snd_motu *motu)
{
fw_unit_put(motu->unit);
mutex_destroy(&motu->mutex);
kfree(motu);
}
/*
* This module releases the FireWire unit data after all ALSA character devices
* are released by applications. This is for releasing stream data or finishing
* transactions safely. Thus at returning from .remove(), this module still keep
* references for the unit.
*/
static void motu_card_free(struct snd_card *card)
{
motu_free(card->private_data);
}
static void do_registration(struct work_struct *work)
{
struct snd_motu *motu = container_of(work, struct snd_motu, dwork.work);
int err;
if (motu->registered)
return;
err = snd_card_new(&motu->unit->device, -1, NULL, THIS_MODULE, 0,
&motu->card);
if (err < 0)
return;
name_card(motu);
err = snd_card_register(motu->card);
if (err < 0)
goto error;
/*
* After registered, motu instance can be released corresponding to
* releasing the sound card instance.
*/
motu->card->private_free = motu_card_free;
motu->card->private_data = motu;
motu->registered = true;
return;
error:
snd_card_free(motu->card);
dev_info(&motu->unit->device,
"Sound card registration failed: %d\n", err);
}
static int motu_probe(struct fw_unit *unit,
const struct ieee1394_device_id *entry)
{
struct snd_motu *motu;
/* Allocate this independently of sound card instance. */
motu = kzalloc(sizeof(struct snd_motu), GFP_KERNEL);
if (motu == NULL)
return -ENOMEM;
motu->spec = (const struct snd_motu_spec *)entry->driver_data;
motu->unit = fw_unit_get(unit);
dev_set_drvdata(&unit->device, motu);
mutex_init(&motu->mutex);
/* Allocate and register this sound card later. */
INIT_DEFERRABLE_WORK(&motu->dwork, do_registration);
snd_fw_schedule_registration(unit, &motu->dwork);
return 0;
}
static void motu_remove(struct fw_unit *unit)
{
struct snd_motu *motu = dev_get_drvdata(&unit->device);
/*
* Confirm to stop the work for registration before the sound card is
* going to be released. The work is not scheduled again because bus
* reset handler is not called anymore.
*/
cancel_delayed_work_sync(&motu->dwork);
if (motu->registered) {
/* No need to wait for releasing card object in this context. */
snd_card_free_when_closed(motu->card);
} else {
/* Don't forget this case. */
motu_free(motu);
}
}
static void motu_bus_update(struct fw_unit *unit)
{
struct snd_motu *motu = dev_get_drvdata(&unit->device);
/* Postpone a workqueue for deferred registration. */
if (!motu->registered)
snd_fw_schedule_registration(unit, &motu->dwork);
}
#define SND_MOTU_DEV_ENTRY(model, data) \
{ \
.match_flags = IEEE1394_MATCH_VENDOR_ID | \
IEEE1394_MATCH_MODEL_ID | \
IEEE1394_MATCH_SPECIFIER_ID, \
.vendor_id = OUI_MOTU, \
.model_id = model, \
.specifier_id = OUI_MOTU, \
.driver_data = (kernel_ulong_t)data, \
}
static const struct ieee1394_device_id motu_id_table[] = {
{ }
};
MODULE_DEVICE_TABLE(ieee1394, motu_id_table);
static struct fw_driver motu_driver = {
.driver = {
.owner = THIS_MODULE,
.name = KBUILD_MODNAME,
.bus = &fw_bus_type,
},
.probe = motu_probe,
.update = motu_bus_update,
.remove = motu_remove,
.id_table = motu_id_table,
};
static int __init alsa_motu_init(void)
{
return driver_register(&motu_driver.driver);
}
static void __exit alsa_motu_exit(void)
{
driver_unregister(&motu_driver.driver);
}
module_init(alsa_motu_init);
module_exit(alsa_motu_exit);
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