trident_main.c

是关于linux2.5.1的完全源码

  
   Returns:     Error status
  
  ---------------------------------------------------------------------------*/

static int snd_trident_foldback_hw_free(snd_pcm_substream_t * substream)
{
	trident_t *trident = snd_pcm_substream_chip(substream);
	snd_pcm_runtime_t *runtime = substream->runtime;
	snd_trident_voice_t *voice = (snd_trident_voice_t *) runtime->private_data;
	snd_trident_voice_t *evoice = voice ? voice->extra : NULL;

	if (trident->tlb.entries && voice && voice->memblk) {
		snd_trident_free_pages(trident, voice->memblk);
		voice->memblk = NULL;
	}
	snd_pcm_lib_free_pages(substream);
	if (evoice != NULL) {
		snd_trident_free_voice(trident, evoice);
		voice->extra = NULL;
	}
	return 0;
}

/*---------------------------------------------------------------------------
   snd_trident_foldback_prepare
  
   Description: Prepare foldback capture device for playback.
  
   Parameters:  substream  - PCM substream class
  
   Returns:     Error status
  
  ---------------------------------------------------------------------------*/

static int snd_trident_foldback_prepare(snd_pcm_substream_t * substream)
{
	trident_t *trident = snd_pcm_substream_chip(substream);
	snd_pcm_runtime_t *runtime = substream->runtime;
	snd_trident_voice_t *voice = (snd_trident_voice_t *) runtime->private_data;
	snd_trident_voice_t *evoice = voice->extra;
	unsigned long flags;

	spin_lock_irqsave(&trident->reg_lock, flags);

	/* Set channel buffer Address */
	if (voice->memblk)
		voice->LBA = voice->memblk->offset;
	else
		voice->LBA = runtime->dma_addr;

	/* set target ESO for channel */
	voice->ESO = runtime->buffer_size - 1;	/* in samples */

	/* set sample rate */
	voice->Delta = 0x1000;
	voice->spurious_threshold = snd_trident_spurious_threshold(48000, runtime->period_size);

	voice->CSO = 0;
	voice->CTRL = snd_trident_control_mode(substream);
	voice->FMC = 3;
	voice->RVol = 0x7f;
	voice->CVol = 0x7f;
	voice->GVSel = 1;
	voice->Pan = 0x7f;	/* mute */
	voice->Vol = 0x3ff;	/* mute */
	voice->EC = 0;
	voice->Alpha = 0;
	voice->FMS = 0;
	voice->Attribute = 0;

	/* set up capture channel */
	outb(((voice->number & 0x3f) | 0x80), TRID_REG(trident, T4D_RCI + voice->foldback_chan));

	snd_trident_write_voice_regs(trident, voice);

	if (evoice != NULL) {
		evoice->Delta = voice->Delta;
		evoice->spurious_threshold = voice->spurious_threshold;
		evoice->LBA = voice->LBA;
		evoice->CSO = 0;
		evoice->ESO = (runtime->period_size * 2) - 1; /* in samples */
		evoice->CTRL = voice->CTRL;
		evoice->FMC = 3;
		evoice->GVSel = trident->device == TRIDENT_DEVICE_ID_SI7018 ? 0 : 1;
		evoice->EC = 0;
		evoice->Alpha = 0;
		evoice->FMS = 0;
		evoice->Vol = 0x3ff;			/* mute */
		evoice->RVol = evoice->CVol = 0x7f;	/* mute */
		evoice->Pan = 0x7f;			/* mute */
		evoice->Attribute = 0;
		snd_trident_write_voice_regs(trident, evoice);
	}

	spin_unlock_irqrestore(&trident->reg_lock, flags);
	return 0;
}

/*---------------------------------------------------------------------------
   snd_trident_spdif_hw_params
  
   Description: Set the hardware parameters for the spdif device.
  
   Parameters:  substream  - PCM substream class
		hw_params  - hardware parameters
  
   Returns:     Error status
  
  ---------------------------------------------------------------------------*/

static int snd_trident_spdif_hw_params(snd_pcm_substream_t * substream,
				       snd_pcm_hw_params_t * hw_params)
{
	trident_t *trident = snd_pcm_substream_chip(substream);
	snd_pcm_runtime_t *runtime = substream->runtime;
	snd_trident_voice_t *voice = (snd_trident_voice_t *) runtime->private_data;
	unsigned long flags;
	unsigned int old_bits = 0, change = 0;
	int err;

	if ((err = snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(hw_params))) < 0)
		return err;
	if (err > 0 && trident->tlb.entries) {
		if (voice->memblk)
			snd_trident_free_pages(trident, voice->memblk);
		spin_lock_irqsave(&trident->reg_lock, flags);
		voice->memblk = snd_trident_alloc_pages(trident, runtime->dma_area, runtime->dma_addr, runtime->dma_bytes);
		spin_unlock_irqrestore(&trident->reg_lock, flags);
		if (voice->memblk == NULL)
			return -ENOMEM;
	}

	/* prepare SPDIF channel */
	spin_lock_irqsave(&trident->reg_lock, flags);
	old_bits = trident->spdif_pcm_bits;
	if (old_bits & IEC958_AES0_PROFESSIONAL)
		trident->spdif_pcm_bits &= ~IEC958_AES0_PRO_FS;
	else
		trident->spdif_pcm_bits &= ~(IEC958_AES3_CON_FS << 24);
	if (params_rate(hw_params) >= 48000) {
		trident->spdif_pcm_ctrl = 0x3c;	// 48000 Hz
		trident->spdif_pcm_bits |=
			trident->spdif_bits & IEC958_AES0_PROFESSIONAL ?
				IEC958_AES0_PRO_FS_48000 :
				(IEC958_AES3_CON_FS_48000 << 24);
	}
	else if (params_rate(hw_params) >= 44100) {
		trident->spdif_pcm_ctrl = 0x3e;	// 44100 Hz
		trident->spdif_pcm_bits |=
			trident->spdif_bits & IEC958_AES0_PROFESSIONAL ?
				IEC958_AES0_PRO_FS_44100 :
				(IEC958_AES3_CON_FS_44100 << 24);
	}
	else {
		trident->spdif_pcm_ctrl = 0x3d;	// 32000 Hz
		trident->spdif_pcm_bits |=
			trident->spdif_bits & IEC958_AES0_PROFESSIONAL ?
				IEC958_AES0_PRO_FS_32000 :
				(IEC958_AES3_CON_FS_32000 << 24);
	}
	change = old_bits != trident->spdif_pcm_bits;
	spin_unlock_irqrestore(&trident->reg_lock, flags);

	if (change)
		snd_ctl_notify(trident->card, SNDRV_CTL_EVENT_MASK_VALUE, &trident->spdif_pcm_ctl->id);

	return 0;
}

/*---------------------------------------------------------------------------
   snd_trident_spdif_hw_free
  
   Description: Release the hardware resources for the spdif device.
  
   Parameters:  substream  - PCM substream class
  
   Returns:     Error status
  
  ---------------------------------------------------------------------------*/

static int snd_trident_spdif_hw_free(snd_pcm_substream_t * substream)
{
	trident_t *trident = snd_pcm_substream_chip(substream);
	snd_pcm_runtime_t *runtime = substream->runtime;
	snd_trident_voice_t *voice = (snd_trident_voice_t *) runtime->private_data;

	if (trident->tlb.entries && voice && voice->memblk) {
		snd_trident_free_pages(trident, voice->memblk);
		voice->memblk = NULL;
	}
	snd_pcm_lib_free_pages(substream);
	return 0;
}

/*---------------------------------------------------------------------------
   snd_trident_spdif_prepare
  
   Description: Prepare SPDIF device for playback.
  
   Parameters:  substream  - PCM substream class
  
   Returns:     Error status
  
  ---------------------------------------------------------------------------*/

static int snd_trident_spdif_prepare(snd_pcm_substream_t * substream)
{
	trident_t *trident = snd_pcm_substream_chip(substream);
	snd_pcm_runtime_t *runtime = substream->runtime;
	snd_trident_voice_t *voice = (snd_trident_voice_t *) runtime->private_data;
	unsigned int RESO, LBAO;
	unsigned long flags;

	spin_lock_irqsave(&trident->reg_lock, flags);	

	/* set delta (rate) value */
	voice->Delta = snd_trident_convert_rate(runtime->rate);
	voice->spurious_threshold = snd_trident_spurious_threshold(runtime->rate, runtime->period_size);

	/* set Loop Back Address */
	LBAO = runtime->dma_addr;
	if (voice->memblk)
		voice->LBA = voice->memblk->offset;
	else
		voice->LBA = LBAO;

	/* set target ESO for channel */
	RESO = runtime->buffer_size - 1;
	voice->ESO = (runtime->period_size * 2) - 1;

	/* set ctrl mode */
	voice->CTRL = snd_trident_control_mode(substream);

	voice->FMC = 3;
	voice->RVol = 0x7f;
	voice->CVol = 0x7f;
	voice->GVSel = 1;
	voice->Pan = 0x7f;
	voice->Vol = 0x3ff;
	voice->EC = 0;
	voice->CSO = 0;
	voice->Alpha = 0;
	voice->FMS = 0;
	voice->Attribute = 0;

	/* prepare surrogate IRQ channel */
	snd_trident_write_voice_regs(trident, voice);

	outw((RESO & 0xffff), TRID_REG(trident, NX_SPESO));
	outb((RESO >> 16), TRID_REG(trident, NX_SPESO + 2));
	outl((LBAO & 0xfffffffc), TRID_REG(trident, NX_SPLBA));
	outw((voice->CSO & 0xffff), TRID_REG(trident, NX_SPCTRL_SPCSO));
	outb((voice->CSO >> 16), TRID_REG(trident, NX_SPCTRL_SPCSO + 2));

	/* set SPDIF setting */
	outb(trident->spdif_pcm_ctrl, TRID_REG(trident, NX_SPCTRL_SPCSO + 3));
	outl(trident->spdif_pcm_bits, TRID_REG(trident, NX_SPCSTATUS));

	spin_unlock_irqrestore(&trident->reg_lock, flags);

	return 0;
}

/*---------------------------------------------------------------------------
   snd_trident_trigger
  
   Description: Start/stop devices
  
   Parameters:  substream  - PCM substream class
   		cmd	- trigger command (STOP, GO)
  
   Returns:     Error status
  
  ---------------------------------------------------------------------------*/

static int snd_trident_trigger(snd_pcm_substream_t *substream,
			       int cmd)
				    
{
	trident_t *trident = snd_pcm_substream_chip(substream);
	snd_pcm_substream_t *s;
	unsigned int what, whati, capture_flag, spdif_flag;
	snd_trident_voice_t *voice, *evoice;
	unsigned int val, go;

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
	case SNDRV_PCM_TRIGGER_RESUME:
		go = 1;
		break;
	case SNDRV_PCM_TRIGGER_STOP:
	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
	case SNDRV_PCM_TRIGGER_SUSPEND:
		go = 0;
		break;
	default:
		return -EINVAL;
	}
	what = whati = capture_flag = spdif_flag = 0;
	s = substream;
	spin_lock(&trident->reg_lock);
	val = inl(TRID_REG(trident, T4D_STIMER)) & 0x00ffffff;
	do {
		if ((trident_t *) _snd_pcm_chip(s->pcm) == trident) {
			voice = (snd_trident_voice_t *) s->runtime->private_data;
			evoice = voice->extra;
			what |= 1 << (voice->number & 0x1f);
			if (evoice == NULL) {
				whati |= 1 << (voice->number & 0x1f);
			} else {
				what |= 1 << (evoice->number & 0x1f);
				whati |= 1 << (evoice->number & 0x1f);
			}
			if (go) {
				voice->running = 1;
				voice->stimer = val;
			} else {
				voice->running = 0;
			}
			snd_pcm_trigger_done(s, substream);
			if (voice->capture)
				capture_flag = 1;
			if (voice->spdif)
				spdif_flag = 1;
		}
		s = s->link_next;
	} while (s != substream);
	if (spdif_flag) {
		outl(trident->spdif_pcm_bits, TRID_REG(trident, NX_SPCSTATUS));
		outb(trident->spdif_pcm_ctrl, TRID_REG(trident, NX_SPCTRL_SPCSO + 3));
	}
	if (!go)
		outl(what, TRID_REG(trident, T4D_STOP_B));
	val = inl(TRID_REG(trident, T4D_AINTEN_B));
	if (go) {
		val |= whati;
	} else {
		val &= ~whati;
	}
	outl(val, TRID_REG(trident, T4D_AINTEN_B));
	if (go) {
		outl(what, TRID_REG(trident, T4D_START_B));
		
		if (capture_flag && trident->device != TRIDENT_DEVICE_ID_SI7018)
			outb(trident->bDMAStart, TRID_REG(trident, T4D_SBCTRL_SBE2R_SBDD));
	} else {
		if (capture_flag && trident->device != TRIDENT_DEVICE_ID_SI7018)
			outb(0x00, TRID_REG(trident, T4D_SBCTRL_SBE2R_SBDD));
	}
	spin_unlock(&trident->reg_lock);
	return 0;
}

/*---------------------------------------------------------------------------
   snd_trident_playback_pointer
  
   Description: This routine return the playback position
                
   Parameters:	substream  - PCM substream class

   Returns:     position of buffer
  
  ---------------------------------------------------------------------------*/

static snd_pcm_uframes_t snd_trident_playback_pointer(snd_pcm_substream_t * substream)
{
	trident_t *trident = snd_pcm_substream_chip(substream);
	snd_pcm_runtime_t *runtime = substream->runtime;
	snd_trident_voice_t *voice = (snd_trident_voice_t *) runtime->private_data;
	unsigned int cso;

	if (!voice->running)
		return 0;

	spin_lock(&trident->reg_lock);

	outb(voice->number, TRID_REG(trident, T4D_LFO_GC_CIR));

	if (trident->device != TRIDENT_DEVICE_ID_NX) {
		cso = inw(TRID_REG(trident, CH_DX_CSO_ALPHA_FMS + 2));
	} else {		// ID_4DWAVE_NX
		cso = (unsigned int) inl(TRID_REG(trident, CH_NX_DELTA_CSO)) & 0x00ffffff;
	}

	if (++cso > runtime->buffer_size)
		cso = runtime->buffer_size;

	spin_unlock(&trident->reg_lock);

	return cso;
}

/*---------------------------------------------------------------------------
   snd_trident_capture_pointer
  
   Description: This routine return the capture position
                
   Paramters:   pcm1    - PCM device class

   Returns:     position of buffer
  
  ---------------------------------------------------------------------------*/

static snd_pcm_uframes_t snd_trident_capture_pointer(snd_pcm_substream_t * substream)
{
	trident_t *trident = snd_pcm_substream_chip(substream);
	snd_pcm_runtime_t *runtime = substream->runtime;
	snd_trident_voice_t *voice = (snd_trident_voice_t *) runtime->private_data;
	unsigned int result;

	if (!voice->running)