emupcm.c

linux 内核源代码

	return result;
}


static snd_pcm_uframes_t snd_emu10k1_capture_pointer(struct snd_pcm_substream *substream)
{
	struct snd_emu10k1 *emu = snd_pcm_substream_chip(substream);
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct snd_emu10k1_pcm *epcm = runtime->private_data;
	unsigned int ptr;

	if (!epcm->running)
		return 0;
	if (epcm->first_ptr) {
		udelay(50);	/* hack, it takes awhile until capture is started */
		epcm->first_ptr = 0;
	}
	ptr = snd_emu10k1_ptr_read(emu, epcm->capture_idx_reg, 0) & 0x0000ffff;
	return bytes_to_frames(runtime, ptr);
}

/*
 *  Playback support device description
 */

static struct snd_pcm_hardware snd_emu10k1_playback =
{
	.info =			(SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
				 SNDRV_PCM_INFO_BLOCK_TRANSFER |
				 SNDRV_PCM_INFO_RESUME |
				 SNDRV_PCM_INFO_MMAP_VALID | SNDRV_PCM_INFO_PAUSE),
	.formats =		SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S16_LE,
	.rates =		SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_8000_96000,
	.rate_min =		4000,
	.rate_max =		96000,
	.channels_min =		1,
	.channels_max =		2,
	.buffer_bytes_max =	(128*1024),
	.period_bytes_min =	64,
	.period_bytes_max =	(128*1024),
	.periods_min =		1,
	.periods_max =		1024,
	.fifo_size =		0,
};

/*
 *  Capture support device description
 */

static struct snd_pcm_hardware snd_emu10k1_capture =
{
	.info =			(SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
				 SNDRV_PCM_INFO_BLOCK_TRANSFER |
				 SNDRV_PCM_INFO_RESUME |
				 SNDRV_PCM_INFO_MMAP_VALID),
	.formats =		SNDRV_PCM_FMTBIT_S16_LE,
	.rates =		SNDRV_PCM_RATE_8000_48000,
	.rate_min =		8000,
	.rate_max =		48000,
	.channels_min =		1,
	.channels_max =		2,
	.buffer_bytes_max =	(64*1024),
	.period_bytes_min =	384,
	.period_bytes_max =	(64*1024),
	.periods_min =		2,
	.periods_max =		2,
	.fifo_size =		0,
};

static struct snd_pcm_hardware snd_emu10k1_capture_efx =
{
	.info =			(SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
				 SNDRV_PCM_INFO_BLOCK_TRANSFER |
				 SNDRV_PCM_INFO_RESUME |
				 SNDRV_PCM_INFO_MMAP_VALID),
	.formats =		SNDRV_PCM_FMTBIT_S16_LE,
	.rates =		SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000 | 
				 SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000 | 
				 SNDRV_PCM_RATE_176400 | SNDRV_PCM_RATE_192000,
	.rate_min =		44100,
	.rate_max =		192000,
	.channels_min =		8,
	.channels_max =		8,
	.buffer_bytes_max =	(64*1024),
	.period_bytes_min =	384,
	.period_bytes_max =	(64*1024),
	.periods_min =		2,
	.periods_max =		2,
	.fifo_size =		0,
};

/*
 *
 */

static void snd_emu10k1_pcm_mixer_notify1(struct snd_emu10k1 *emu, struct snd_kcontrol *kctl, int idx, int activate)
{
	struct snd_ctl_elem_id id;

	if (! kctl)
		return;
	if (activate)
		kctl->vd[idx].access &= ~SNDRV_CTL_ELEM_ACCESS_INACTIVE;
	else
		kctl->vd[idx].access |= SNDRV_CTL_ELEM_ACCESS_INACTIVE;
	snd_ctl_notify(emu->card, SNDRV_CTL_EVENT_MASK_VALUE |
		       SNDRV_CTL_EVENT_MASK_INFO,
		       snd_ctl_build_ioff(&id, kctl, idx));
}

static void snd_emu10k1_pcm_mixer_notify(struct snd_emu10k1 *emu, int idx, int activate)
{
	snd_emu10k1_pcm_mixer_notify1(emu, emu->ctl_send_routing, idx, activate);
	snd_emu10k1_pcm_mixer_notify1(emu, emu->ctl_send_volume, idx, activate);
	snd_emu10k1_pcm_mixer_notify1(emu, emu->ctl_attn, idx, activate);
}

static void snd_emu10k1_pcm_efx_mixer_notify(struct snd_emu10k1 *emu, int idx, int activate)
{
	snd_emu10k1_pcm_mixer_notify1(emu, emu->ctl_efx_send_routing, idx, activate);
	snd_emu10k1_pcm_mixer_notify1(emu, emu->ctl_efx_send_volume, idx, activate);
	snd_emu10k1_pcm_mixer_notify1(emu, emu->ctl_efx_attn, idx, activate);
}

static void snd_emu10k1_pcm_free_substream(struct snd_pcm_runtime *runtime)
{
	kfree(runtime->private_data);
}

static int snd_emu10k1_efx_playback_close(struct snd_pcm_substream *substream)
{
	struct snd_emu10k1 *emu = snd_pcm_substream_chip(substream);
	struct snd_emu10k1_pcm_mixer *mix;
	int i;

	for (i = 0; i < NUM_EFX_PLAYBACK; i++) {
		mix = &emu->efx_pcm_mixer[i];
		mix->epcm = NULL;
		snd_emu10k1_pcm_efx_mixer_notify(emu, i, 0);
	}
	return 0;
}

static int snd_emu10k1_efx_playback_open(struct snd_pcm_substream *substream)
{
	struct snd_emu10k1 *emu = snd_pcm_substream_chip(substream);
	struct snd_emu10k1_pcm *epcm;
	struct snd_emu10k1_pcm_mixer *mix;
	struct snd_pcm_runtime *runtime = substream->runtime;
	int i;

	epcm = kzalloc(sizeof(*epcm), GFP_KERNEL);
	if (epcm == NULL)
		return -ENOMEM;
	epcm->emu = emu;
	epcm->type = PLAYBACK_EFX;
	epcm->substream = substream;
	
	emu->pcm_playback_efx_substream = substream;

	runtime->private_data = epcm;
	runtime->private_free = snd_emu10k1_pcm_free_substream;
	runtime->hw = snd_emu10k1_efx_playback;
	
	for (i = 0; i < NUM_EFX_PLAYBACK; i++) {
		mix = &emu->efx_pcm_mixer[i];
		mix->send_routing[0][0] = i;
		memset(&mix->send_volume, 0, sizeof(mix->send_volume));
		mix->send_volume[0][0] = 255;
		mix->attn[0] = 0xffff;
		mix->epcm = epcm;
		snd_emu10k1_pcm_efx_mixer_notify(emu, i, 1);
	}
	return 0;
}

static int snd_emu10k1_playback_open(struct snd_pcm_substream *substream)
{
	struct snd_emu10k1 *emu = snd_pcm_substream_chip(substream);
	struct snd_emu10k1_pcm *epcm;
	struct snd_emu10k1_pcm_mixer *mix;
	struct snd_pcm_runtime *runtime = substream->runtime;
	int i, err;

	epcm = kzalloc(sizeof(*epcm), GFP_KERNEL);
	if (epcm == NULL)
		return -ENOMEM;
	epcm->emu = emu;
	epcm->type = PLAYBACK_EMUVOICE;
	epcm->substream = substream;
	runtime->private_data = epcm;
	runtime->private_free = snd_emu10k1_pcm_free_substream;
	runtime->hw = snd_emu10k1_playback;
	if ((err = snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS)) < 0) {
		kfree(epcm);
		return err;
	}
	if ((err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 256, UINT_MAX)) < 0) {
		kfree(epcm);
		return err;
	}
	mix = &emu->pcm_mixer[substream->number];
	for (i = 0; i < 4; i++)
		mix->send_routing[0][i] = mix->send_routing[1][i] = mix->send_routing[2][i] = i;
	memset(&mix->send_volume, 0, sizeof(mix->send_volume));
	mix->send_volume[0][0] = mix->send_volume[0][1] =
	mix->send_volume[1][0] = mix->send_volume[2][1] = 255;
	mix->attn[0] = mix->attn[1] = mix->attn[2] = 0xffff;
	mix->epcm = epcm;
	snd_emu10k1_pcm_mixer_notify(emu, substream->number, 1);
	return 0;
}

static int snd_emu10k1_playback_close(struct snd_pcm_substream *substream)
{
	struct snd_emu10k1 *emu = snd_pcm_substream_chip(substream);
	struct snd_emu10k1_pcm_mixer *mix = &emu->pcm_mixer[substream->number];

	mix->epcm = NULL;
	snd_emu10k1_pcm_mixer_notify(emu, substream->number, 0);
	return 0;
}

static int snd_emu10k1_capture_open(struct snd_pcm_substream *substream)
{
	struct snd_emu10k1 *emu = snd_pcm_substream_chip(substream);
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct snd_emu10k1_pcm *epcm;

	epcm = kzalloc(sizeof(*epcm), GFP_KERNEL);
	if (epcm == NULL)
		return -ENOMEM;
	epcm->emu = emu;
	epcm->type = CAPTURE_AC97ADC;
	epcm->substream = substream;
	epcm->capture_ipr = IPR_ADCBUFFULL|IPR_ADCBUFHALFFULL;
	epcm->capture_inte = INTE_ADCBUFENABLE;
	epcm->capture_ba_reg = ADCBA;
	epcm->capture_bs_reg = ADCBS;
	epcm->capture_idx_reg = emu->audigy ? A_ADCIDX : ADCIDX;
	runtime->private_data = epcm;
	runtime->private_free = snd_emu10k1_pcm_free_substream;
	runtime->hw = snd_emu10k1_capture;
	emu->capture_interrupt = snd_emu10k1_pcm_ac97adc_interrupt;
	emu->pcm_capture_substream = substream;
	snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, &hw_constraints_capture_period_sizes);
	snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, &hw_constraints_capture_rates);
	return 0;
}

static int snd_emu10k1_capture_close(struct snd_pcm_substream *substream)
{
	struct snd_emu10k1 *emu = snd_pcm_substream_chip(substream);

	emu->capture_interrupt = NULL;
	emu->pcm_capture_substream = NULL;
	return 0;
}

static int snd_emu10k1_capture_mic_open(struct snd_pcm_substream *substream)
{
	struct snd_emu10k1 *emu = snd_pcm_substream_chip(substream);
	struct snd_emu10k1_pcm *epcm;
	struct snd_pcm_runtime *runtime = substream->runtime;

	epcm = kzalloc(sizeof(*epcm), GFP_KERNEL);
	if (epcm == NULL)
		return -ENOMEM;
	epcm->emu = emu;
	epcm->type = CAPTURE_AC97MIC;
	epcm->substream = substream;
	epcm->capture_ipr = IPR_MICBUFFULL|IPR_MICBUFHALFFULL;
	epcm->capture_inte = INTE_MICBUFENABLE;
	epcm->capture_ba_reg = MICBA;
	epcm->capture_bs_reg = MICBS;
	epcm->capture_idx_reg = emu->audigy ? A_MICIDX : MICIDX;
	substream->runtime->private_data = epcm;
	substream->runtime->private_free = snd_emu10k1_pcm_free_substream;
	runtime->hw = snd_emu10k1_capture;
	runtime->hw.rates = SNDRV_PCM_RATE_8000;
	runtime->hw.rate_min = runtime->hw.rate_max = 8000;
	runtime->hw.channels_min = 1;
	emu->capture_mic_interrupt = snd_emu10k1_pcm_ac97mic_interrupt;
	emu->pcm_capture_mic_substream = substream;
	snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, &hw_constraints_capture_period_sizes);
	return 0;
}

static int snd_emu10k1_capture_mic_close(struct snd_pcm_substream *substream)
{
	struct snd_emu10k1 *emu = snd_pcm_substream_chip(substream);

	emu->capture_interrupt = NULL;
	emu->pcm_capture_mic_substream = NULL;
	return 0;
}

static int snd_emu10k1_capture_efx_open(struct snd_pcm_substream *substream)
{
	struct snd_emu10k1 *emu = snd_pcm_substream_chip(substream);
	struct snd_emu10k1_pcm *epcm;
	struct snd_pcm_runtime *runtime = substream->runtime;
	int nefx = emu->audigy ? 64 : 32;
	int idx;

	epcm = kzalloc(sizeof(*epcm), GFP_KERNEL);
	if (epcm == NULL)
		return -ENOMEM;
	epcm->emu = emu;
	epcm->type = CAPTURE_EFX;
	epcm->substream = substream;
	epcm->capture_ipr = IPR_EFXBUFFULL|IPR_EFXBUFHALFFULL;
	epcm->capture_inte = INTE_EFXBUFENABLE;
	epcm->capture_ba_reg = FXBA;
	epcm->capture_bs_reg = FXBS;
	epcm->capture_idx_reg = FXIDX;
	substream->runtime->private_data = epcm;
	substream->runtime->private_free = snd_emu10k1_pcm_free_substream;
	runtime->hw = snd_emu10k1_capture_efx;
	runtime->hw.rates = SNDRV_PCM_RATE_48000;
	runtime->hw.rate_min = runtime->hw.rate_max = 48000;
	spin_lock_irq(&emu->reg_lock);
	if (emu->card_capabilities->emu1010) {
		/*  Nb. of channels has been increased to 16 */
		/* TODO
		 * SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S32_LE
		 * SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000 |
		 * SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000 |
		 * SNDRV_PCM_RATE_176400 | SNDRV_PCM_RATE_192000
		 * rate_min = 44100,
		 * rate_max = 192000,
		 * channels_min = 16,
		 * channels_max = 16,
		 * Need to add mixer control to fix sample rate
		 *                 
		 * There are 32 mono channels of 16bits each.
		 * 24bit Audio uses 2x channels over 16bit
		 * 96kHz uses 2x channels over 48kHz
		 * 192kHz uses 4x channels over 48kHz
		 * So, for 48kHz 24bit, one has 16 channels
		 * for 96kHz 24bit, one has 8 channels
		 * for 192kHz 24bit, one has 4 channels
		 *
		 */
#if 1
		switch (emu->emu1010.internal_clock) {
		case 0:
			/* For 44.1kHz */
			runtime->hw.rates = SNDRV_PCM_RATE_44100;
			runtime->hw.rate_min = runtime->hw.rate_max = 44100;
			runtime->hw.channels_min =
				runtime->hw.channels_max = 16;
			break;
		case 1:
			/* For 48kHz */
			runtime->hw.rates = SNDRV_PCM_RATE_48000;
			runtime->hw.rate_min = runtime->hw.rate_max = 48000;
			runtime->hw.channels_min =
				runtime->hw.channels_max = 16;
			break;
		};
#endif
#if 0
		/* For 96kHz */
		runtime->hw.rates = SNDRV_PCM_RATE_96000;
		runtime->hw.rate_min = runtime->hw.rate_max = 96000;
		runtime->hw.channels_min = runtime->hw.channels_max = 4;
#endif
#if 0
		/* For 192kHz */
		runtime->hw.rates = SNDRV_PCM_RATE_192000;
		runtime->hw.rate_min = runtime->hw.rate_max = 192000;
		runtime->hw.channels_min = runtime->hw.channels_max = 2;
#endif
		runtime->hw.formats = SNDRV_PCM_FMTBIT_S32_LE;
		/* efx_voices_mask[0] is expected to be zero
 		 * efx_voices_mask[1] is expected to have 32bits set
		 */
	} else {
		runtime->hw.channels_min = runtime->hw.channels_max = 0;
		for (idx = 0; idx < nefx; idx++) {
			if (emu->efx_voices_mask[idx/32] & (1 << (idx%32))) {
				runtime->hw.channels_min++;
				runtime->hw.channels_max++;
			}
		}
	}
	epcm->capture_cr_val = emu->efx_voices_mask[0];
	epcm->capture_cr_val2 = emu->efx_voices_mask[1];
	spin_unlock_irq(&emu->reg_lock);
	emu->capture_efx_interrupt = snd_emu10k1_pcm_efx_interrupt;
	emu->pcm_capture_efx_substream = substream;
	snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, &hw_constraints_capture_period_sizes);
	return 0;
}

static int snd_emu10k1_capture_efx_close(struct snd_pcm_substream *substream)
{
	struct snd_emu10k1 *emu = snd_pcm_substream_chip(substream);

	emu->capture_interrupt = NULL;
	emu->pcm_capture_efx_substream = NULL;
	return 0;
}

static struct snd_pcm_ops snd_emu10k1_playback_ops = {
	.open =			snd_emu10k1_playback_open,
	.close =		snd_emu10k1_playback_close,
	.ioctl =		snd_pcm_lib_ioctl,
	.hw_params =		snd_emu10k1_playback_hw_params,
	.hw_free =		snd_emu10k1_playback_hw_free,
	.prepare =		snd_emu10k1_playback_prepare,
	.trigger =		snd_emu10k1_playback_trigger,
	.pointer =		snd_emu10k1_playback_pointer,
	.page =			snd_pcm_sgbuf_ops_page,
};

static struct snd_pcm_ops snd_emu10k1_capture_ops = {
	.open =			snd_emu10k1_capture_open,
	.close =		snd_emu10k1_capture_close,
	.ioctl =		snd_pcm_lib_ioctl,
	.hw_params =		snd_emu10k1_capture_hw_params,
	.hw_free =		snd_emu10k1_capture_hw_free,
	.prepare =		snd_emu10k1_capture_prepare,
	.trigger =		snd_emu10k1_capture_trigger,
	.pointer =		snd_emu10k1_capture_pointer,
};

/* EFX playback */
static struct snd_pcm_ops snd_emu10k1_efx_playback_ops = {
	.open =			snd_emu10k1_efx_playback_open,
	.close =		snd_emu10k1_efx_playback_close,
	.ioctl =		snd_pcm_lib_ioctl,
	.hw_params =		snd_emu10k1_playback_hw_params,
	.hw_free =		snd_emu10k1_efx_playback_hw_free,
	.prepare =		snd_emu10k1_efx_playback_prepare,
	.trigger =		snd_emu10k1_efx_playback_trigger,
	.pointer =		snd_emu10k1_efx_playback_pointer,
	.page =			snd_pcm_sgbuf_ops_page,
};

int __devinit snd_emu10k1_pcm(struct snd_emu10k1 * emu, int device, struct snd_pcm ** rpcm)
{
	struct snd_pcm *pcm;
	struct snd_pcm_substream *substream;
	int err;

	if (rpcm)
		*rpcm = NULL;

	if ((err = snd_pcm_new(emu->card, "emu10k1", device, 32, 1, &pcm)) < 0)
		return err;

	pcm->private_data = emu;

	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_emu10k1_playback_ops);