C++ snd_pcm_set_ops函数代码示例

static int
snd_ad1889_pcm_init(struct snd_ad1889 *chip, int device)
{
	int err;
	struct snd_pcm *pcm;

	err = snd_pcm_new(chip->card, chip->card->driver, device, 1, 1, &pcm);
	if (err < 0)
		return err;

	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, 
			&snd_ad1889_playback_ops);
	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE,
			&snd_ad1889_capture_ops);

	pcm->private_data = chip;
	pcm->info_flags = 0;
	strcpy(pcm->name, chip->card->shortname);
	
	chip->pcm = pcm;
	chip->psubs = NULL;
	chip->csubs = NULL;

	err = snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
						snd_dma_pci_data(chip->pci),
						BUFFER_BYTES_MAX / 2,
						BUFFER_BYTES_MAX);

	if (err < 0) {
		dev_err(chip->card->dev, "buffer allocation error: %d\n", err);
		return err;
	}
	
	return 0;
}

int __devinit snd_ad1816a_pcm(struct snd_ad1816a *chip, int device, struct snd_pcm **rpcm)
{
	int error;
	struct snd_pcm *pcm;

	if ((error = snd_pcm_new(chip->card, "AD1816A", device, 1, 1, &pcm)))
		return error;

	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_ad1816a_playback_ops);
	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_ad1816a_capture_ops);

	pcm->private_data = chip;
	pcm->info_flags = (chip->dma1 == chip->dma2 ) ? SNDRV_PCM_INFO_JOINT_DUPLEX : 0;

	strcpy(pcm->name, snd_ad1816a_chip_id(chip));
	snd_ad1816a_init(chip);

	snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
					      snd_dma_isa_data(),
					      64*1024, chip->dma1 > 3 || chip->dma2 > 3 ? 128*1024 : 64*1024);

	chip->pcm = pcm;
	if (rpcm)
		*rpcm = pcm;
	return 0;
}

static int msm_pcm_new(struct snd_soc_pcm_runtime *rtd)
{
	int ret;
	struct snd_card *card = rtd->card->snd_card;
	struct snd_pcm *pcm = rtd->pcm;

	if (!card->dev->coherent_dma_mask)
		card->dev->coherent_dma_mask = DMA_BIT_MASK(32);

	ret = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_PLAYBACK, 1);
	if (ret)
		return ret;
	ret = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_CAPTURE, 1);
	if (ret)
		return ret;
	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &msm_pcm_ops);
	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &msm_pcm_ops);

	ret = pcm_preallocate_dma_buffer(pcm, SNDRV_PCM_STREAM_PLAYBACK);
	if (ret)
		return ret;

	ret = pcm_preallocate_dma_buffer(pcm, SNDRV_PCM_STREAM_CAPTURE);
	if (ret)
		msm_pcm_free_dma_buffers(pcm);
	return ret;
}

static int __devinit
snd_nm256_pcm(struct nm256 *chip, int device)
{
	struct snd_pcm *pcm;
	int i, err;

	for (i = 0; i < 2; i++) {
		struct nm256_stream *s = &chip->streams[i];
		s->bufptr = chip->buffer + (s->buf - chip->buffer_start);
		s->bufptr_addr = chip->buffer_addr + (s->buf - chip->buffer_start);
	}

	err = snd_pcm_new(chip->card, chip->card->driver, device,
			  1, 1, &pcm);
	if (err < 0)
		return err;

	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_nm256_playback_ops);
	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_nm256_capture_ops);

	pcm->private_data = chip;
	pcm->info_flags = 0;
	chip->pcm = pcm;

	return 0;
}

static int __devinit snd_card_dummy_pcm(struct snd_dummy *dummy, int device,
					int substreams)
{
	struct snd_pcm *pcm;
	struct snd_pcm_ops *ops;
	int err;

	err = snd_pcm_new(dummy->card, "Dummy PCM", device,
			       substreams, substreams, &pcm);
	if (err < 0)
		return err;
	dummy->pcm = pcm;
	if (fake_buffer)
		ops = &dummy_pcm_ops_no_buf;
	else
		ops = &dummy_pcm_ops;
	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, ops);
	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, ops);
	pcm->private_data = dummy;
	pcm->info_flags = 0;
	strcpy(pcm->name, "Dummy PCM");
	if (!fake_buffer) {
		snd_pcm_lib_preallocate_pages_for_all(pcm,
			SNDRV_DMA_TYPE_CONTINUOUS,
			snd_dma_continuous_data(GFP_KERNEL),
			0, 64*1024);
	}
	return 0;
}

/* create a PCM device */
static int snd_line6_new_pcm(struct snd_line6_pcm *line6pcm)
{
	struct snd_pcm *pcm;
	int err;

	err = snd_pcm_new(line6pcm->line6->card,
			  (char *)line6pcm->line6->properties->name,
			  0, 1, 1, &pcm);
	if (err < 0)
		return err;

	pcm->private_data = line6pcm;
	pcm->private_free = line6_cleanup_pcm;
	line6pcm->pcm = pcm;
	strcpy(pcm->name, line6pcm->line6->properties->name);

	/* set operators */
	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK,
			&snd_line6_playback_ops);
	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_line6_capture_ops);

	/* pre-allocation of buffers */
	snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS,
					      snd_dma_continuous_data
					      (GFP_KERNEL), 64 * 1024,
					      128 * 1024);

	return 0;
}

static int msm_pcm_new(struct snd_card *card,
			struct snd_soc_dai *codec_dai,
			struct snd_pcm *pcm)
{
	int ret;
	if (!card->dev->coherent_dma_mask)
		card->dev->coherent_dma_mask = DMA_32BIT_MASK;

	ret = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_PLAYBACK, 1);
	if (ret)
		return ret;
	ret = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_CAPTURE, 1);
	if (ret)
		return ret;
	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &msm_pcm_ops);
	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &msm_pcm_ops);

	ret = pcm_preallocate_dma_buffer(pcm, SNDRV_PCM_STREAM_PLAYBACK);
	if (ret)
		return ret;

	ret = pcm_preallocate_dma_buffer(pcm, SNDRV_PCM_STREAM_CAPTURE);
	if (ret)
		msm_pcm_free_dma_buffers(pcm);
	return ret;
}

int __devinit snd_cs5535audio_pcm(struct cs5535audio *cs5535au)
{
	struct snd_pcm *pcm;
	int err;

	err = snd_pcm_new(cs5535au->card, "CS5535 Audio", 0, 1, 1, &pcm);
	if (err < 0)
		return err;

	cs5535au->dmas[CS5535AUDIO_DMA_PLAYBACK].ops =
					&snd_cs5535audio_playback_dma_ops;
	cs5535au->dmas[CS5535AUDIO_DMA_CAPTURE].ops =
					&snd_cs5535audio_capture_dma_ops;
	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK,
					&snd_cs5535audio_playback_ops);
	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE,
					&snd_cs5535audio_capture_ops);

	pcm->private_data = cs5535au;
	pcm->info_flags = 0;
	strcpy(pcm->name, "CS5535 Audio");

	snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
					snd_dma_pci_data(cs5535au->pci),
					64*1024, 128*1024);
	cs5535au->pcm = pcm;

	return 0;
}

int __devinit snd_p16v_pcm(struct snd_emu10k1 *emu, int device, struct snd_pcm **rpcm)
{
	struct snd_pcm *pcm;
	struct snd_pcm_substream *substream;
	int err;
        int capture=1;
  
	/* snd_printk(KERN_DEBUG "snd_p16v_pcm called. device=%d\n", device); */
	emu->p16v_device_offset = device;
	if (rpcm)
		*rpcm = NULL;

	if ((err = snd_pcm_new(emu->card, "p16v", device, 1, capture, &pcm)) < 0)
		return err;
  
	pcm->private_data = emu;
	// Single playback 8 channel device.
	// Single capture 2 channel device.
	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_p16v_playback_front_ops);
	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_p16v_capture_ops);

	pcm->info_flags = 0;
	pcm->dev_subclass = SNDRV_PCM_SUBCLASS_GENERIC_MIX;
	strcpy(pcm->name, "p16v");
	emu->pcm_p16v = pcm;

	for(substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream; 
	    substream; 
	    substream = substream->next) {
		if ((err = snd_pcm_lib_preallocate_pages(substream, 
							 SNDRV_DMA_TYPE_DEV, 
							 snd_dma_pci_data(emu->pci), 
							 ((65536 - 64) * 8), ((65536 - 64) * 8))) < 0) 
			return err;
		/*
		snd_printk(KERN_DEBUG
			   "preallocate playback substream: err=%d\n", err);
		*/
	}

	for (substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream; 
	      substream; 
	      substream = substream->next) {
 		if ((err = snd_pcm_lib_preallocate_pages(substream, 
	                                           SNDRV_DMA_TYPE_DEV, 
	                                           snd_dma_pci_data(emu->pci), 
	                                           65536 - 64, 65536 - 64)) < 0)
			return err;
		/*
		snd_printk(KERN_DEBUG
			   "preallocate capture substream: err=%d\n", err);
		*/
	}
  
	if (rpcm)
		*rpcm = pcm;
  
	return 0;
}

/*
 * intel_alsa_create_pcm_device : to setup pcm for the card
 *
 * Input parameters
 *		@card : pointer to the sound card structure
 *		@p_alsa_ssp_snd_card : pointer to internal context
 *
 * Output parameters
 *		@ret_val : status, 0 ==> OK
 *
 */
static int intel_alsa_create_pcm_device(struct snd_card *card,
                                        struct intel_alsa_ssp_card_info *p_alsa_ssp_snd_card)
{
    struct snd_pcm *pl_pcm;
    int i, ret_val = 0;

    WARN(!card, "ALSA_SSP: ERROR NULL card\n");
    if (!card)
        return -EINVAL;

    WARN(!p_alsa_ssp_snd_card,
         "ALSA_SSP: ERROR NULL p_alsa_ssp_snd_card\n");
    if (!p_alsa_ssp_snd_card)
        return -EINVAL;

    /*
     * The alsa_ssp driver handles provide 2 PCM devices :
     * device 0 ==> BT with 1 capture sub-stream + 1 play sub-stream
     * device 1 ==> FM with 1 capture sub-stream + 0 play sub-stream
     * These 2 devices are exclusive
     */
    for (i = 0; i < INTEL_ALSA_SSP_SND_CARD_MAX_DEVICES; i++) {

        ret_val = snd_pcm_new(card, s_dev_info[i].dev_name, i,
                              s_dev_info[i].nb_play_stream,
                              s_dev_info[i].nb_capt_stream,
                              &pl_pcm);

        if (ret_val)
            return ret_val;

        /* setup the ops for playback and capture streams */
        snd_pcm_set_ops(pl_pcm, SNDRV_PCM_STREAM_PLAYBACK,
                        &s_alsa_ssp_playback_ops);
        snd_pcm_set_ops(pl_pcm, SNDRV_PCM_STREAM_CAPTURE,
                        &s_alsa_ssp_capture_ops);

        /* setup private data which can be retrieved when required */
        pl_pcm->private_data = p_alsa_ssp_snd_card;
        pl_pcm->info_flags = 0;

        strncpy(pl_pcm->name, card->shortname, strlen(card->shortname));

        /*
         * allocate DMA pages for ALSA stream operations pre-allocation
         * to all substreams of the given pcm for the specified DMA type
         */
        snd_pcm_lib_preallocate_pages_for_all(pl_pcm,
                                              SNDRV_DMA_TYPE_CONTINUOUS,
                                              snd_dma_continuous_data
                                              (GFP_KERNEL),
                                              s_dev_info[i].stream_hw_param->buffer_bytes_max,
                                              s_dev_info[i].stream_hw_param->buffer_bytes_max);
    }

    return ret_val;
}

/* create a pcm device */
static int __devinit snd_vortex_new_pcm(vortex_t *chip, int idx, int nr)
{
	struct snd_pcm *pcm;
	struct snd_kcontrol *kctl;
	int i;
	int err, nr_capt;

	if (!chip || idx < 0 || idx >= VORTEX_PCM_LAST)
		return -ENODEV;

	/* idx indicates which kind of PCM device. ADB, SPDIF, I2S and A3D share the 
	 * same dma engine. WT uses it own separate dma engine which can't capture. */
	if (idx == VORTEX_PCM_ADB)
		nr_capt = nr;
	else
		nr_capt = 0;
	err = snd_pcm_new(chip->card, vortex_pcm_prettyname[idx], idx, nr,
			  nr_capt, &pcm);
	if (err < 0)
		return err;
	snprintf(pcm->name, sizeof(pcm->name),
		"%s %s", CARD_NAME_SHORT, vortex_pcm_name[idx]);
	chip->pcm[idx] = pcm;
	// This is an evil hack, but it saves a lot of duplicated code.
	VORTEX_PCM_TYPE(pcm) = idx;
	pcm->private_data = chip;
	/* set operators */
	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK,
			&snd_vortex_playback_ops);
	if (idx == VORTEX_PCM_ADB)
		snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE,
				&snd_vortex_playback_ops);
	
	/* pre-allocation of Scatter-Gather buffers */
	
	snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV_SG,
					      snd_dma_pci_data(chip->pci_dev),
					      0x10000, 0x10000);

	if (VORTEX_PCM_TYPE(pcm) == VORTEX_PCM_SPDIF) {
		for (i = 0; i < ARRAY_SIZE(snd_vortex_mixer_spdif); i++) {
			kctl = snd_ctl_new1(&snd_vortex_mixer_spdif[i], chip);
			if (!kctl)
				return -ENOMEM;
			if ((err = snd_ctl_add(chip->card, kctl)) < 0)
				return err;
		}
	}
	return 0;
}

/**
 * snd_intelmad_pcm_new - to setup pcm for the card
 *
 * @card:  pointer to the sound card structure
 * @intelmaddata: pointer to internal context
 * @pb: playback count for this card
 * @cap: capture count for this card
 * @index: device index
 *
 * This function is called from probe function to set up pcm params
 * and functions
 */
static int __devinit snd_intelmad_pcm_new(struct snd_card *card,
			struct snd_intelmad *intelmaddata,
			unsigned int pb, unsigned int cap, unsigned int index)
{
	int ret_val = 0;
	struct snd_pcm *pcm;
	char name[32] = INTEL_MAD;
	struct snd_pcm_ops *pb_ops = NULL, *cap_ops = NULL;

	pr_debug("called for pb %d, cp %d, idx %d\n", pb, cap, index);
	ret_val = snd_pcm_new(card, name, index, pb, cap, &pcm);
	if (ret_val)
		return ret_val;
	/* setup the ops for playback and capture streams */
	switch (index) {
	case 0:
		pb_ops = &snd_intelmad_headset_ops;
		cap_ops = &snd_intelmad_capture_ops;
		break;
	case 1:
		pb_ops = &snd_intelmad_ihf_ops;
		cap_ops = &snd_intelmad_capture_ops;
		break;
	case 2:
		pb_ops = &snd_intelmad_vibra_ops;
		cap_ops = &snd_intelmad_capture_ops;
		break;
	case 3:
		pb_ops = &snd_intelmad_haptic_ops;
		cap_ops = &snd_intelmad_capture_ops;
		break;
	}
	if (pb)
		snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, pb_ops);
	if (cap)
		snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, cap_ops);
	/* setup private data which can be retrieved when required */
	pcm->private_data = intelmaddata;
	pcm->private_free = snd_intelmad_page_free;
	pcm->info_flags = 0;
	strncpy(pcm->name, card->shortname, strlen(card->shortname));
	/* allocate dma pages for ALSA stream operations */
	snd_pcm_lib_preallocate_pages_for_all(pcm,
			SNDRV_DMA_TYPE_CONTINUOUS,
			snd_dma_continuous_data(GFP_KERNEL),
			MIN_BUFFER, MAX_BUFFER);
	return ret_val;
}

/* TO DO: set up to handle more than one pcm instance */
static int __init snd_aicapcmchip(struct snd_card_aica
				  *dreamcastcard, int pcm_index)
{
	struct snd_pcm *pcm;
	int err;
	/* AICA has no capture ability */
	err =
	    snd_pcm_new(dreamcastcard->card, "AICA PCM", pcm_index, 1, 0,
			&pcm);
	if (unlikely(err < 0))
		return err;
	pcm->private_data = dreamcastcard;
	strcpy(pcm->name, "AICA PCM");
	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK,
			&snd_aicapcm_playback_ops);
	/* Allocate the DMA buffers */
	err =
	    snd_pcm_lib_preallocate_pages_for_all(pcm,
						  SNDRV_DMA_TYPE_CONTINUOUS,
						  snd_dma_continuous_data
						  (GFP_KERNEL),
						  AICA_BUFFER_SIZE,
						  AICA_BUFFER_SIZE);
	return err;
}

int poseidon_audio_init(struct poseidon *p)
{
	struct poseidon_audio *pa = &p->audio;
	struct snd_card *card;
	struct snd_pcm *pcm;
	int ret;

	ret = snd_card_new(&p->interface->dev, -1, "Telegent",
			   THIS_MODULE, 0, &card);
	if (ret != 0)
		return ret;

	ret = snd_pcm_new(card, "poseidon audio", 0, 0, 1, &pcm);
	if (ret < 0) {
		snd_card_free(card);
		return ret;
	}
	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &pcm_capture_ops);
	pcm->info_flags   = 0;
	pcm->private_data = p;
	strcpy(pcm->name, "poseidon audio capture");

	strcpy(card->driver, "ALSA driver");
	strcpy(card->shortname, "poseidon Audio");
	strcpy(card->longname, "poseidon ALSA Audio");

	if (snd_card_register(card)) {
		snd_card_free(card);
		return -ENOMEM;
	}
	pa->card = card;
	return 0;
}

int snd_cx18_pcm_create(struct snd_cx18_card *cxsc)
{
	struct snd_pcm *sp;
	struct snd_card *sc = cxsc->sc;
	struct v4l2_device *v4l2_dev = cxsc->v4l2_dev;
	struct cx18 *cx = to_cx18(v4l2_dev);
	int ret;

	ret = snd_pcm_new(sc, "CX23418 PCM",
			  0, /* PCM device 0, the only one for this card */
			  0, /* 0 playback substreams */
			  1, /* 1 capture substream */
			  &sp);
	if (ret) {
		CX18_ALSA_ERR("%s: snd_cx18_pcm_create() failed with err %d\n",
			      __func__, ret);
		goto err_exit;
	}

	spin_lock_init(&cxsc->slock);

	snd_pcm_set_ops(sp, SNDRV_PCM_STREAM_CAPTURE,
			&snd_cx18_pcm_capture_ops);
	sp->info_flags = 0;
	sp->private_data = cxsc;
	strlcpy(sp->name, cx->card_name, sizeof(sp->name));

	return 0;

err_exit:
	return ret;
}