Quelle  digi00x.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * digi00x.c - a part of driver for Digidesign Digi 002/003 family
 *
 * Copyright (c) 2014-2015 Takashi Sakamoto
 */

#include "digi00x.h"

MODULE_DESCRIPTION("Digidesign Digi 002/003 family Driver");
MODULE_AUTHOR("Takashi Sakamoto <o-takashi@sakamocchi.jp>");
MODULE_LICENSE("GPL");

#define VENDOR_DIGIDESIGN 0x00a07e
#define MODEL_CONSOLE  0x000001
#define MODEL_RACK  0x000002
#define SPEC_VERSION  0x000001

static int name_card(struct snd_dg00x *dg00x)
{
 struct fw_device *fw_dev = fw_parent_device(dg00x->unit);
 char name[32] = {0};
 char *model;
 int err;

 err = fw_csr_string(dg00x->unit->directory, CSR_MODEL, name,
       sizeof(name));
 if (err < 0)
  return err;

 model = skip_spaces(name);

 strscpy(dg00x->card->driver, "Digi00x");
 strscpy(dg00x->card->shortname, model);
 strscpy(dg00x->card->mixername, model);
 snprintf(dg00x->card->longname, sizeof(dg00x->card->longname),
   "Digidesign %s, GUID %08x%08x at %s, S%d", model,
   fw_dev->config_rom[3], fw_dev->config_rom[4],
   dev_name(&dg00x->unit->device), 100 << fw_dev->max_speed);

 return 0;
}

static void dg00x_card_free(struct snd_card *card)
{
 struct snd_dg00x *dg00x = card->private_data;

 snd_dg00x_stream_destroy_duplex(dg00x);
 snd_dg00x_transaction_unregister(dg00x);

 mutex_destroy(&dg00x->mutex);
 fw_unit_put(dg00x->unit);
}

static int snd_dg00x_probe(struct fw_unit *unit, const struct ieee1394_device_id *entry)
{
 struct snd_card *card;
 struct snd_dg00x *dg00x;
 int err;

 err = snd_card_new(&unit->device, -1, NULL, THIS_MODULE, sizeof(*dg00x), &card);
 if (err < 0)
  return err;
 card->private_free = dg00x_card_free;

 dg00x = card->private_data;
 dg00x->unit = fw_unit_get(unit);
 dev_set_drvdata(&unit->device, dg00x);
 dg00x->card = card;

 mutex_init(&dg00x->mutex);
 spin_lock_init(&dg00x->lock);
 init_waitqueue_head(&dg00x->hwdep_wait);

 dg00x->is_console = entry->model_id == MODEL_CONSOLE;

 err = name_card(dg00x);
 if (err < 0)
  goto error;

 err = snd_dg00x_stream_init_duplex(dg00x);
 if (err < 0)
  goto error;

 snd_dg00x_proc_init(dg00x);

 err = snd_dg00x_create_pcm_devices(dg00x);
 if (err < 0)
  goto error;

 err = snd_dg00x_create_midi_devices(dg00x);
 if (err < 0)
  goto error;

 err = snd_dg00x_create_hwdep_device(dg00x);
 if (err < 0)
  goto error;

 err = snd_dg00x_transaction_register(dg00x);
 if (err < 0)
  goto error;

 err = snd_card_register(card);
 if (err < 0)
  goto error;

 return 0;
error:
 snd_card_free(card);
 return err;
}

static void snd_dg00x_update(struct fw_unit *unit)
{
 struct snd_dg00x *dg00x = dev_get_drvdata(&unit->device);

 snd_dg00x_transaction_reregister(dg00x);

 mutex_lock(&dg00x->mutex);
 snd_dg00x_stream_update_duplex(dg00x);
 mutex_unlock(&dg00x->mutex);
}

static void snd_dg00x_remove(struct fw_unit *unit)
{
 struct snd_dg00x *dg00x = dev_get_drvdata(&unit->device);

 // Block till all of ALSA character devices are released.
 snd_card_free(dg00x->card);
}

static const struct ieee1394_device_id snd_dg00x_id_table[] = {
 /* Both of 002/003 use the same ID. */
 {
  .match_flags = IEEE1394_MATCH_VENDOR_ID |
          IEEE1394_MATCH_VERSION |
          IEEE1394_MATCH_MODEL_ID,
  .vendor_id = VENDOR_DIGIDESIGN,
  .version = SPEC_VERSION,
  .model_id = MODEL_CONSOLE,
 },
 {
  .match_flags = IEEE1394_MATCH_VENDOR_ID |
          IEEE1394_MATCH_VERSION |
          IEEE1394_MATCH_MODEL_ID,
  .vendor_id = VENDOR_DIGIDESIGN,
  .version = SPEC_VERSION,
  .model_id = MODEL_RACK,
 },
 {}
};
MODULE_DEVICE_TABLE(ieee1394, snd_dg00x_id_table);

static struct fw_driver dg00x_driver = {
 .driver = {
  .owner = THIS_MODULE,
  .name = KBUILD_MODNAME,
  .bus = &fw_bus_type,
 },
 .probe    = snd_dg00x_probe,
 .update   = snd_dg00x_update,
 .remove   = snd_dg00x_remove,
 .id_table = snd_dg00x_id_table,
};

static int __init snd_dg00x_init(void)
{
 return driver_register(&dg00x_driver.driver);
}

static void __exit snd_dg00x_exit(void)
{
 driver_unregister(&dg00x_driver.driver);
}

module_init(snd_dg00x_init);
module_exit(snd_dg00x_exit);