static int pcmidi_snd_initialise()

in hid-prodikeys.c [601:720]

• 97 lines of code
• 13 McCabe index (conditional complexity)

static int pcmidi_snd_initialise(struct pcmidi_snd *pm)
{
	static int dev;
	struct snd_card *card;
	struct snd_rawmidi *rwmidi;
	int err;

	static struct snd_device_ops ops = {
		.dev_free = pcmidi_snd_free,
	};

	if (pm->ifnum != 1)
		return 0; /* only set up midi device ONCE for interace 1 */

	if (dev >= SNDRV_CARDS)
		return -ENODEV;

	if (!enable[dev]) {
		dev++;
		return -ENOENT;
	}

	/* Setup sound card */

	err = snd_card_new(&pm->pk->hdev->dev, index[dev], id[dev],
			   THIS_MODULE, 0, &card);
	if (err < 0) {
		pk_error("failed to create pc-midi sound card\n");
		err = -ENOMEM;
		goto fail;
	}
	pm->card = card;

	/* Setup sound device */
	err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, pm, &ops);
	if (err < 0) {
		pk_error("failed to create pc-midi sound device: error %d\n",
			err);
		goto fail;
	}

	strncpy(card->driver, shortname, sizeof(card->driver));
	strncpy(card->shortname, shortname, sizeof(card->shortname));
	strncpy(card->longname, longname, sizeof(card->longname));

	/* Set up rawmidi */
	err = snd_rawmidi_new(card, card->shortname, 0,
			      0, 1, &rwmidi);
	if (err < 0) {
		pk_error("failed to create pc-midi rawmidi device: error %d\n",
			err);
		goto fail;
	}
	pm->rwmidi = rwmidi;
	strncpy(rwmidi->name, card->shortname, sizeof(rwmidi->name));
	rwmidi->info_flags = SNDRV_RAWMIDI_INFO_INPUT;
	rwmidi->private_data = pm;

	snd_rawmidi_set_ops(rwmidi, SNDRV_RAWMIDI_STREAM_INPUT,
		&pcmidi_in_ops);

	/* create sysfs variables */
	err = device_create_file(&pm->pk->hdev->dev,
				 sysfs_device_attr_channel);
	if (err < 0) {
		pk_error("failed to create sysfs attribute channel: error %d\n",
			err);
		goto fail;
	}

	err = device_create_file(&pm->pk->hdev->dev,
				sysfs_device_attr_sustain);
	if (err < 0) {
		pk_error("failed to create sysfs attribute sustain: error %d\n",
			err);
		goto fail_attr_sustain;
	}

	err = device_create_file(&pm->pk->hdev->dev,
			 sysfs_device_attr_octave);
	if (err < 0) {
		pk_error("failed to create sysfs attribute octave: error %d\n",
			err);
		goto fail_attr_octave;
	}

	spin_lock_init(&pm->rawmidi_in_lock);

	init_sustain_timers(pm);
	err = pcmidi_set_operational(pm);
	if (err < 0) {
		pk_error("failed to find output report\n");
		goto fail_register;
	}

	/* register it */
	err = snd_card_register(card);
	if (err < 0) {
		pk_error("failed to register pc-midi sound card: error %d\n",
			 err);
		goto fail_register;
	}

	dbg_hid("pcmidi_snd_initialise finished ok\n");
	return 0;

fail_register:
	stop_sustain_timers(pm);
	device_remove_file(&pm->pk->hdev->dev, sysfs_device_attr_octave);
fail_attr_octave:
	device_remove_file(&pm->pk->hdev->dev, sysfs_device_attr_sustain);
fail_attr_sustain:
	device_remove_file(&pm->pk->hdev->dev, sysfs_device_attr_channel);
fail:
	if (pm->card) {
		snd_card_free(pm->card);
		pm->card = NULL;
	}
	return err;
}