C++ snd_device_new函数代码示例

static int __devinit snd_vx222_create(struct snd_card *card, struct pci_dev *pci,
				      struct snd_vx_hardware *hw,
				      struct snd_vx222 **rchip)
{
	struct vx_core *chip;
	struct snd_vx222 *vx;
	int i, err;
	static struct snd_device_ops ops = {
		.dev_free =	snd_vx222_dev_free,
	};
	struct snd_vx_ops *vx_ops;

	
	if ((err = pci_enable_device(pci)) < 0)
		return err;
	pci_set_master(pci);

	vx_ops = hw->type == VX_TYPE_BOARD ? &vx222_old_ops : &vx222_ops;
	chip = snd_vx_create(card, hw, vx_ops,
			     sizeof(struct snd_vx222) - sizeof(struct vx_core));
	if (! chip) {
		pci_disable_device(pci);
		return -ENOMEM;
	}
	vx = (struct snd_vx222 *)chip;
	vx->pci = pci;

	if ((err = pci_request_regions(pci, CARD_NAME)) < 0) {
		snd_vx222_free(chip);
		return err;
	}
	for (i = 0; i < 2; i++)
		vx->port[i] = pci_resource_start(pci, i + 1);

	if (request_irq(pci->irq, snd_vx_irq_handler, IRQF_SHARED,
			KBUILD_MODNAME, chip)) {
		snd_printk(KERN_ERR "unable to grab IRQ %d\n", pci->irq);
		snd_vx222_free(chip);
		return -EBUSY;
	}
	chip->irq = pci->irq;

	if ((err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops)) < 0) {
		snd_vx222_free(chip);
		return err;
	}

	snd_card_set_dev(card, &pci->dev);

	*rchip = vx;
	return 0;
}

/*
 * Use __devinit to place it in the same section as rtx_ac97_probe() (see
 * below).
 */
static int __devinit	rtx_ac97_create(struct snd_card *card,
					struct pci_dev *pdev)
{
	static struct snd_device_ops	ops = {
		.dev_free = rtx_ac97_dev_free
	};
	struct rtx_ac97			*chip;
	int				err;

	err = pci_enable_device(pdev);
	if (err < 0)
		return (err);

	chip = kzalloc(sizeof(*chip), GFP_KERNEL);
	if (!chip) {
		err = -ENOMEM;
		goto fail;
	}
	chip->pdev = pdev;
	chip->card = card;

	/* Allocate PCI stuff here */

	/*
	 * create a "fake" lowlevel (custom) device to have a dtor for our chip
	 * structure:
	 */
	err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops);
	if (err < 0)
		goto fail;

	/*
	 * registration of device structure this seems needed for alsa/linux
	 * internal stuff:
	 */
	snd_card_set_dev(card, &pdev->dev);

	printk(KERN_INFO "rtx_ac97: chip=0x%p created.\n", chip);

	/* attach ourselves to the card instance: */
	card->private_data = chip;

	return (0);

fail:
	if (chip)
		rtx_ac97_free(chip);
	else
		pci_disable_device(pdev);
	return (err);
}

/*
	Initialize the Line6 MIDI subsystem.
*/
int line6_init_midi(struct usb_line6 *line6)
{
	static struct snd_device_ops midi_ops = {
		.dev_free = snd_line6_midi_free,
	};

	int err;
	struct snd_line6_midi *line6midi;

	if (!(line6->properties->capabilities & LINE6_BIT_CONTROL)) {
		/* skip MIDI initialization and report success */
		return 0;
	}

	line6midi = kzalloc(sizeof(struct snd_line6_midi), GFP_KERNEL);

	if (line6midi == NULL)
		return -ENOMEM;

	err = line6_midibuf_init(&line6midi->midibuf_in, MIDI_BUFFER_SIZE, 0);
	if (err < 0) {
		kfree(line6midi);
		return err;
	}

	err = line6_midibuf_init(&line6midi->midibuf_out, MIDI_BUFFER_SIZE, 1);
	if (err < 0) {
		kfree(line6midi->midibuf_in.buf);
		kfree(line6midi);
		return err;
	}

	line6midi->line6 = line6;
	line6->line6midi = line6midi;

	err = snd_device_new(line6->card, SNDRV_DEV_RAWMIDI, line6midi,
			     &midi_ops);
	if (err < 0)
		return err;

	snd_card_set_dev(line6->card, line6->ifcdev);

	err = snd_line6_new_midi(line6midi);
	if (err < 0)
		return err;

	init_waitqueue_head(&line6midi->send_wait);
	spin_lock_init(&line6midi->send_urb_lock);
	spin_lock_init(&line6midi->midi_transmit_lock);
	return 0;
}

static int snd_pcsp_create(struct snd_card *card)
{
	static struct snd_device_ops ops = { };
	unsigned int resolution = hrtimer_resolution;
	int err, div, min_div, order;

	if (!nopcm) {
		if (resolution > PCSP_MAX_PERIOD_NS) {
			printk(KERN_ERR "PCSP: Timer resolution is not sufficient "
				"(%unS)\n", resolution);
			printk(KERN_ERR "PCSP: Make sure you have HPET and ACPI "
				"enabled.\n");
			printk(KERN_ERR "PCSP: Turned into nopcm mode.\n");
			nopcm = 1;
		}
	}

	if (loops_per_jiffy >= PCSP_MIN_LPJ && resolution <= PCSP_MIN_PERIOD_NS)
		min_div = MIN_DIV;
	else
		min_div = MAX_DIV;
#if PCSP_DEBUG
	printk(KERN_DEBUG "PCSP: lpj=%li, min_div=%i, res=%u\n",
	       loops_per_jiffy, min_div, resolution);
#endif

	div = MAX_DIV / min_div;
	order = fls(div) - 1;

	pcsp_chip.max_treble = min(order, PCSP_MAX_TREBLE);
	pcsp_chip.treble = min(pcsp_chip.max_treble, PCSP_DEFAULT_TREBLE);
	pcsp_chip.playback_ptr = 0;
	pcsp_chip.period_ptr = 0;
	atomic_set(&pcsp_chip.timer_active, 0);
	pcsp_chip.enable = 1;
	pcsp_chip.pcspkr = 1;

	spin_lock_init(&pcsp_chip.substream_lock);

	pcsp_chip.card = card;
	pcsp_chip.port = 0x61;
	pcsp_chip.irq = -1;
	pcsp_chip.dma = -1;

	/* Register device */
	err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, &pcsp_chip, &ops);
	if (err < 0)
		return err;

	return 0;
}

static int __devinit snd_pcsp_create(struct snd_card *card)
{
	static struct snd_device_ops ops = { };
	struct timespec tp;
	int err;
	int div, min_div, order;

	hrtimer_get_res(CLOCK_MONOTONIC, &tp);
	if (tp.tv_sec || tp.tv_nsec > PCSP_MAX_PERIOD_NS) {
		printk(KERN_ERR "PCSP: Timer resolution is not sufficient "
		       "(%linS)\n", tp.tv_nsec);
		printk(KERN_ERR "PCSP: Make sure you have HPET and ACPI "
		       "enabled.\n");
		return -EIO;
	}

	if (loops_per_jiffy >= PCSP_MIN_LPJ && tp.tv_nsec <= PCSP_MIN_PERIOD_NS)
		min_div = MIN_DIV;
	else
		min_div = MAX_DIV;
#if PCSP_DEBUG
	printk("PCSP: lpj=%li, min_div=%i, res=%li\n",
	       loops_per_jiffy, min_div, tp.tv_nsec);
#endif

	div = MAX_DIV / min_div;
	order = fls(div) - 1;

	pcsp_chip.max_treble = min(order, PCSP_MAX_TREBLE);
	pcsp_chip.treble = min(pcsp_chip.max_treble, PCSP_DEFAULT_TREBLE);
	pcsp_chip.playback_ptr = 0;
	pcsp_chip.period_ptr = 0;
	atomic_set(&pcsp_chip.timer_active, 0);
	pcsp_chip.enable = 1;
	pcsp_chip.pcspkr = 1;

	spin_lock_init(&pcsp_chip.substream_lock);

	pcsp_chip.card = card;
	pcsp_chip.port = 0x61;
	pcsp_chip.irq = -1;
	pcsp_chip.dma = -1;

	/* Register device */
	err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, &pcsp_chip, &ops);
	if (err < 0)
		return err;

	return 0;
}

/*
 * snd_compress_new: create new compress device
 * @card: sound card pointer
 * @device: device number
 * @dirn: device direction, should be of type enum snd_compr_direction
 * @compr: compress device pointer
 */
int snd_compress_new(struct snd_card *card, int device,
			int dirn, struct snd_compr *compr)
{
	static struct snd_device_ops ops = {
		.dev_free = NULL,
		.dev_register = snd_compress_dev_register,
		.dev_disconnect = snd_compress_dev_disconnect,
	};

	compr->card = card;
	compr->device = device;
	compr->direction = dirn;
	return snd_device_new(card, SNDRV_DEV_COMPRESS, compr, &ops);
}

static int __devinit snd_intelmad_create(
		struct snd_intelmad *intelmaddata,
		struct snd_card *card)
{
	int ret_val;
	static struct snd_device_ops ops = {
		.dev_free =	snd_intelmad_dev_free,
	};

	WARN_ON(!intelmaddata);
	WARN_ON(!card);
	/* ALSA api to register for the device */
	ret_val = snd_device_new(card, SNDRV_DEV_LOWLEVEL, intelmaddata, &ops);
	return ret_val;
}

int snd_ak4114_create(snd_card_t *card,
		      ak4114_read_t *read, ak4114_write_t *write,
		      unsigned char pgm[7], unsigned char txcsb[5],
		      void *private_data, ak4114_t **r_ak4114)
{
	ak4114_t *chip;
	int err = 0;
	unsigned char reg;
	static snd_device_ops_t ops = {
		.dev_free =     snd_ak4114_dev_free,
	};

	chip = kcalloc(1, sizeof(*chip), GFP_KERNEL);
	if (chip == NULL)
		return -ENOMEM;
	spin_lock_init(&chip->lock);
	chip->card = card;
	chip->read = read;
	chip->write = write;
	chip->private_data = private_data;

	for (reg = 0; reg < 7; reg++)
		chip->regmap[reg] = pgm[reg];
	for (reg = 0; reg < 5; reg++)
		chip->txcsb[reg] = txcsb[reg];

	chip->workqueue = create_workqueue("snd-ak4114");
	if (chip->workqueue == NULL) {
		kfree(chip);
		return -ENOMEM;
	}

	snd_ak4114_reinit(chip);

	chip->rcs0 = reg_read(chip, AK4114_REG_RCS0) & ~(AK4114_QINT | AK4114_CINT);
	chip->rcs1 = reg_read(chip, AK4114_REG_RCS1);

	if ((err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops)) < 0)
		goto __fail;

	if (r_ak4114)
		*r_ak4114 = chip;
	return 0;

      __fail:
	snd_ak4114_free(chip);
	return err < 0 ? err : -EIO;
}

/**
 * snd_hwdep_new - create a new hwdep instance
 * @card: the card instance
 * @id: the id string
 * @device: the device index (zero-based)
 * @rhwdep: the pointer to store the new hwdep instance
 *
 * Creates a new hwdep instance with the given index on the card.
 * The callbacks (hwdep->ops) must be set on the returned instance
 * after this call manually by the caller.
 *
 * Return: Zero if successful, or a negative error code on failure.
 */
int snd_hwdep_new(struct snd_card *card, char *id, int device,
		  struct snd_hwdep **rhwdep)
{
	struct snd_hwdep *hwdep;
	int err;
	static struct snd_device_ops ops = {
		.dev_free = snd_hwdep_dev_free,
		.dev_register = snd_hwdep_dev_register,
		.dev_disconnect = snd_hwdep_dev_disconnect,
	};

	if (snd_BUG_ON(!card))
		return -ENXIO;
	if (rhwdep)
		*rhwdep = NULL;
	hwdep = kzalloc(sizeof(*hwdep), GFP_KERNEL);
	if (hwdep == NULL) {
		dev_err(card->dev, "hwdep: cannot allocate\n");
		return -ENOMEM;
	}

	init_waitqueue_head(&hwdep->open_wait);
	mutex_init(&hwdep->open_mutex);
	hwdep->card = card;
	hwdep->device = device;
	if (id)
		strlcpy(hwdep->id, id, sizeof(hwdep->id));

	snd_device_initialize(&hwdep->dev, card);
	hwdep->dev.release = release_hwdep_device;
	dev_set_name(&hwdep->dev, "hwC%iD%i", card->number, device);
#ifdef CONFIG_SND_OSSEMUL
	hwdep->oss_type = -1;
#endif

	err = snd_device_new(card, SNDRV_DEV_HWDEP, hwdep, &ops);
	if (err < 0) {
		put_device(&hwdep->dev);
		return err;
	}

	if (rhwdep)
		*rhwdep = hwdep;
	return 0;
}

/*
 * snd_compress_new: create new compress device
 * @card: sound card pointer
 * @device: device number
 * @dirn: device direction, should be of type enum snd_compr_direction
 * @compr: compress device pointer
 */
int snd_compress_new(struct snd_card *card, int device,
			int dirn, struct snd_compr *compr)
{
	static struct snd_device_ops ops = {
		.dev_free = snd_compress_dev_free,
		.dev_register = snd_compress_dev_register,
		.dev_disconnect = snd_compress_dev_disconnect,
	};

	compr->card = card;
	compr->device = device;
	compr->direction = dirn;

	snd_device_initialize(&compr->dev, card);
	dev_set_name(&compr->dev, "comprC%iD%i", card->number, device);

	return snd_device_new(card, SNDRV_DEV_COMPRESS, compr, &ops);
}

static int __devinit snd_sh_dac_create(struct snd_card *card,
				       struct platform_device *devptr,
				       struct snd_sh_dac **rchip)
{
	struct snd_sh_dac *chip;
	int err;

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

	*rchip = NULL;

	chip = kzalloc(sizeof(*chip), GFP_KERNEL);
	if (chip == NULL)
		return -ENOMEM;

	chip->card = card;

	hrtimer_init(&chip->hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
	chip->hrtimer.function = sh_dac_audio_timer;

	dac_audio_reset(chip);
	chip->rate = 8000;
	dac_audio_set_rate(chip);

	chip->pdata = devptr->dev.platform_data;

	chip->data_buffer = kmalloc(chip->pdata->buffer_size, GFP_KERNEL);
	if (chip->data_buffer == NULL) {
		kfree(chip);
		return -ENOMEM;
	}

	err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops);
	if (err < 0) {
		snd_sh_dac_free(chip);
		return err;
	}

	*rchip = chip;

	return 0;
}

int snd_ak4113_create(struct snd_card *card, ak4113_read_t *read,
		ak4113_write_t *write, const unsigned char *pgm,
		void *private_data, struct ak4113 **r_ak4113)
{
	struct ak4113 *chip;
	int err = 0;
	unsigned char reg;
	static struct snd_device_ops ops = {
		.dev_free =     snd_ak4113_dev_free,
	};

	chip = kzalloc(sizeof(*chip), GFP_KERNEL);
	if (chip == NULL)
		return -ENOMEM;
	spin_lock_init(&chip->lock);
	chip->card = card;
	chip->read = read;
	chip->write = write;
	chip->private_data = private_data;
	INIT_DELAYED_WORK(&chip->work, ak4113_stats);
	atomic_set(&chip->wq_processing, 0);

	for (reg = 0; reg < AK4113_WRITABLE_REGS ; reg++)
		chip->regmap[reg] = pgm[reg];
	ak4113_init_regs(chip);

	chip->rcs0 = reg_read(chip, AK4113_REG_RCS0) & ~(AK4113_QINT |
			AK4113_CINT | AK4113_STC);
	chip->rcs1 = reg_read(chip, AK4113_REG_RCS1);
	chip->rcs2 = reg_read(chip, AK4113_REG_RCS2);
	err = snd_device_new(card, SNDRV_DEV_CODEC, chip, &ops);
	if (err < 0)
		goto __fail;

	if (r_ak4113)
		*r_ak4113 = chip;
	return 0;

__fail:
	snd_ak4113_free(chip);
	return err < 0 ? err : -EIO;
}

static int hda_tegra_create(struct snd_card *card,
			    unsigned int driver_caps,
			    struct hda_tegra *hda)
{
	static struct snd_device_ops ops = {
		.dev_disconnect = hda_tegra_dev_disconnect,
		.dev_free = hda_tegra_dev_free,
	};
	struct azx *chip;
	int err;

	chip = &hda->chip;

	mutex_init(&chip->open_mutex);
	chip->card = card;
	chip->ops = &hda_tegra_ops;
	chip->driver_caps = driver_caps;
	chip->driver_type = driver_caps & 0xff;
	chip->dev_index = 0;
	INIT_LIST_HEAD(&chip->pcm_list);

	chip->codec_probe_mask = -1;

	chip->single_cmd = false;
	chip->snoop = true;

	INIT_WORK(&hda->probe_work, hda_tegra_probe_work);

	err = azx_bus_init(chip, NULL, &hda_tegra_io_ops);
	if (err < 0)
		return err;

	chip->bus.needs_damn_long_delay = 1;

	err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops);
	if (err < 0) {
		dev_err(card->dev, "Error creating device\n");
		return err;
	}

	return 0;
}

/*
 * create vxpocket instance
 */
static struct snd_vxpocket *snd_vxpocket_new(struct snd_card *card, int ibl)
{
	dev_link_t *link;		/* Info for cardmgr */
	struct vx_core *chip;
	struct snd_vxpocket *vxp;
	static struct snd_device_ops ops = {
		.dev_free =	snd_vxpocket_dev_free,
	};

	chip = snd_vx_create(card, &vxpocket_hw, &snd_vxpocket_ops,
			     sizeof(struct snd_vxpocket) - sizeof(struct vx_core));
	if (! chip)
		return NULL;

	if (snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops) < 0) {
		kfree(chip);
		return NULL;
	}
	chip->ibl.size = ibl;

	vxp = (struct snd_vxpocket *)chip;

	link = &vxp->link;
	link->priv = chip;

	link->io.Attributes1 = IO_DATA_PATH_WIDTH_AUTO;
	link->io.NumPorts1 = 16;

	link->irq.Attributes = IRQ_TYPE_EXCLUSIVE | IRQ_HANDLE_PRESENT;

	link->irq.IRQInfo1 = IRQ_LEVEL_ID;
	link->irq.Handler = &snd_vx_irq_handler;
	link->irq.Instance = chip;

	link->conf.Attributes = CONF_ENABLE_IRQ;
	link->conf.Vcc = 50;
	link->conf.IntType = INT_MEMORY_AND_IO;
	link->conf.ConfigIndex = 1;
	link->conf.Present = PRESENT_OPTION;

	return vxp;
}

int snd_ak4117_create(struct snd_card *card, ak4117_read_t *read, ak4117_write_t *write,
		      const unsigned char pgm[5], void *private_data, struct ak4117 **r_ak4117)
{
	struct ak4117 *chip;
	int err = 0;
	unsigned char reg;
	static struct snd_device_ops ops = {
		.dev_free =     snd_ak4117_dev_free,
	};

	chip = kzalloc(sizeof(*chip), GFP_KERNEL);
	if (chip == NULL)
		return -ENOMEM;
	spin_lock_init(&chip->lock);
	chip->card = card;
	chip->read = read;
	chip->write = write;
	chip->private_data = private_data;
	init_timer(&chip->timer);
	chip->timer.data = (unsigned long)chip;
	chip->timer.function = snd_ak4117_timer;

	for (reg = 0; reg < 5; reg++)
		chip->regmap[reg] = pgm[reg];
	snd_ak4117_reinit(chip);

	chip->rcs0 = reg_read(chip, AK4117_REG_RCS0) & ~(AK4117_QINT | AK4117_CINT | AK4117_STC);
	chip->rcs1 = reg_read(chip, AK4117_REG_RCS1);
	chip->rcs2 = reg_read(chip, AK4117_REG_RCS2);

	if ((err = snd_device_new(card, SNDRV_DEV_CODEC, chip, &ops)) < 0)
		goto __fail;

	if (r_ak4117)
		*r_ak4117 = chip;
	return 0;

      __fail:
	snd_ak4117_free(chip);
	return err < 0 ? err : -EIO;
}