trident_main.c

是关于linux2.5.1的完全源码

	}
}

/*---------------------------------------------------------------------------
   snd_trident_write_voice_regs
  
   Description: This routine will complete and write the 5 hardware channel
                registers to hardware.
  
   Paramters:   trident - pointer to target device class for 4DWave.
                voice - synthesizer voice structure
                Each register field.
  
  ---------------------------------------------------------------------------*/

void snd_trident_write_voice_regs(trident_t * trident,
				  snd_trident_voice_t * voice)
{
	unsigned int FmcRvolCvol;
	unsigned int regs[5];

	regs[1] = voice->LBA;
	regs[4] = (voice->GVSel << 31) |
		  ((voice->Pan & 0x0000007f) << 24) |
		  ((voice->CTRL & 0x0000000f) << 12);
	FmcRvolCvol = ((voice->FMC & 3) << 14) |
	              ((voice->RVol & 0x7f) << 7) |
	              (voice->CVol & 0x7f);

	switch (trident->device) {
	case TRIDENT_DEVICE_ID_SI7018:
		regs[4] |= voice->number > 31 ?
				(voice->Vol & 0x000003ff) :
				((voice->Vol & 0x00003fc) << (16-2)) |
				(voice->EC & 0x00000fff);
		regs[0] = (voice->CSO << 16) | ((voice->Alpha & 0x00000fff) << 4) | (voice->FMS & 0x0000000f);
		regs[2] = (voice->ESO << 16) | (voice->Delta & 0x0ffff);
		regs[3] = (voice->Attribute << 16) | FmcRvolCvol;
		break;
	case TRIDENT_DEVICE_ID_DX:
		regs[4] |= ((voice->Vol & 0x000003fc) << (16-2)) |
			   (voice->EC & 0x00000fff);
		regs[0] = (voice->CSO << 16) | ((voice->Alpha & 0x00000fff) << 4) | (voice->FMS & 0x0000000f);
		regs[2] = (voice->ESO << 16) | (voice->Delta & 0x0ffff);
		regs[3] = FmcRvolCvol;
		break;
	case TRIDENT_DEVICE_ID_NX:
		regs[4] |= ((voice->Vol & 0x000003fc) << (16-2)) |
			   (voice->EC & 0x00000fff);
		regs[0] = (voice->Delta << 24) | (voice->CSO & 0x00ffffff);
		regs[2] = ((voice->Delta << 16) & 0xff000000) | (voice->ESO & 0x00ffffff);
		regs[3] = (voice->Alpha << 20) | ((voice->FMS & 0x0000000f) << 16) | FmcRvolCvol;
		break;
	default:
		snd_BUG();
	}

	outb(voice->number, TRID_REG(trident, T4D_LFO_GC_CIR));
	outl(regs[0], TRID_REG(trident, CH_START + 0));
	outl(regs[1], TRID_REG(trident, CH_START + 4));
	outl(regs[2], TRID_REG(trident, CH_START + 8));
	outl(regs[3], TRID_REG(trident, CH_START + 12));
	outl(regs[4], TRID_REG(trident, CH_START + 16));
}

/*---------------------------------------------------------------------------
   snd_trident_write_cso_reg
  
   Description: This routine will write the new CSO offset
                register to hardware.
  
   Paramters:   trident - pointer to target device class for 4DWave.
                voice - synthesizer voice structure
                CSO - new CSO value
  
  ---------------------------------------------------------------------------*/

static void snd_trident_write_cso_reg(trident_t * trident, snd_trident_voice_t * voice, unsigned int CSO)
{
	voice->CSO = CSO;
	outb(voice->number, TRID_REG(trident, T4D_LFO_GC_CIR));
	if (trident->device != TRIDENT_DEVICE_ID_NX) {
		outw(voice->CSO, TRID_REG(trident, CH_DX_CSO_ALPHA_FMS) + 2);
	} else {
		outl((voice->Delta << 24) | (voice->CSO & 0x00ffffff), TRID_REG(trident, CH_NX_DELTA_CSO));
	}
}

/*---------------------------------------------------------------------------
   snd_trident_write_vol_reg
  
   Description: This routine will write the new voice volume
                register to hardware.
  
   Paramters:   trident - pointer to target device class for 4DWave.
                voice - synthesizer voice structure
                Vol - new voice volume
  
  ---------------------------------------------------------------------------*/

static void snd_trident_write_vol_reg(trident_t * trident, snd_trident_voice_t * voice, unsigned int Vol)
{
	voice->Vol = Vol;
	outb(voice->number, TRID_REG(trident, T4D_LFO_GC_CIR));
	switch (trident->device) {
	case TRIDENT_DEVICE_ID_DX:
	case TRIDENT_DEVICE_ID_NX:
		outb(voice->Vol >> 2, TRID_REG(trident, CH_GVSEL_PAN_VOL_CTRL_EC + 2));
		break;
	case TRIDENT_DEVICE_ID_SI7018:
		// printk("voice->Vol = 0x%x\n", voice->Vol);
		outw((voice->CTRL << 12) | voice->Vol, TRID_REG(trident, CH_GVSEL_PAN_VOL_CTRL_EC));
		break;
	}
}

/*---------------------------------------------------------------------------
   snd_trident_write_pan_reg
  
   Description: This routine will write the new voice pan
                register to hardware.
  
   Paramters:   trident - pointer to target device class for 4DWave.
                voice - synthesizer voice structure
                Pan - new pan value
  
  ---------------------------------------------------------------------------*/

static void snd_trident_write_pan_reg(trident_t * trident, snd_trident_voice_t * voice, unsigned int Pan)
{
	voice->Pan = Pan;
	outb(voice->number, TRID_REG(trident, T4D_LFO_GC_CIR));
	outb(((voice->GVSel & 0x01) << 7) | (voice->Pan & 0x7f), TRID_REG(trident, CH_GVSEL_PAN_VOL_CTRL_EC + 3));
}

/*---------------------------------------------------------------------------
   snd_trident_write_rvol_reg
  
   Description: This routine will write the new reverb volume
                register to hardware.
  
   Paramters:   trident - pointer to target device class for 4DWave.
                voice - synthesizer voice structure
                RVol - new reverb volume
  
  ---------------------------------------------------------------------------*/

static void snd_trident_write_rvol_reg(trident_t * trident, snd_trident_voice_t * voice, unsigned int RVol)
{
	voice->RVol = RVol;
	outb(voice->number, TRID_REG(trident, T4D_LFO_GC_CIR));
	outw(((voice->FMC & 0x0003) << 14) | ((voice->RVol & 0x007f) << 7) | (voice->CVol & 0x007f),
	     TRID_REG(trident, trident->device == TRIDENT_DEVICE_ID_NX ? CH_NX_ALPHA_FMS_FMC_RVOL_CVOL : CH_DX_FMC_RVOL_CVOL));
}

/*---------------------------------------------------------------------------
   snd_trident_write_cvol_reg
  
   Description: This routine will write the new chorus volume
                register to hardware.
  
   Paramters:   trident - pointer to target device class for 4DWave.
                voice - synthesizer voice structure
                CVol - new chorus volume
  
  ---------------------------------------------------------------------------*/

static void snd_trident_write_cvol_reg(trident_t * trident, snd_trident_voice_t * voice, unsigned int CVol)
{
	voice->CVol = CVol;
	outb(voice->number, TRID_REG(trident, T4D_LFO_GC_CIR));
	outw(((voice->FMC & 0x0003) << 14) | ((voice->RVol & 0x007f) << 7) | (voice->CVol & 0x007f),
	     TRID_REG(trident, trident->device == TRIDENT_DEVICE_ID_NX ? CH_NX_ALPHA_FMS_FMC_RVOL_CVOL : CH_DX_FMC_RVOL_CVOL));
}

/*---------------------------------------------------------------------------
   snd_trident_convert_rate

   Description: This routine converts rate in HZ to hardware delta value.
  
   Paramters:   trident - pointer to target device class for 4DWave.
                rate - Real or Virtual channel number.
  
   Returns:     Delta value.
  
  ---------------------------------------------------------------------------*/
unsigned int snd_trident_convert_rate(unsigned int rate)
{
	unsigned int delta;

	// We special case 44100 and 8000 since rounding with the equation
	// does not give us an accurate enough value. For 11025 and 22050
	// the equation gives us the best answer. All other frequencies will
	// also use the equation. JDW
	if (rate == 44100)
		delta = 0xeb3;
	else if (rate == 8000)
		delta = 0x2ab;
	else if (rate == 48000)
		delta = 0x1000;
	else
		delta = (((rate << 12) + 24000) / 48000) & 0x0000ffff;
	return delta;
}

/*---------------------------------------------------------------------------
   snd_trident_convert_adc_rate

   Description: This routine converts rate in HZ to hardware delta value.
  
   Paramters:   trident - pointer to target device class for 4DWave.
                rate - Real or Virtual channel number.
  
   Returns:     Delta value.
  
  ---------------------------------------------------------------------------*/
static unsigned int snd_trident_convert_adc_rate(unsigned int rate)
{
	unsigned int delta;

	// We special case 44100 and 8000 since rounding with the equation
	// does not give us an accurate enough value. For 11025 and 22050
	// the equation gives us the best answer. All other frequencies will
	// also use the equation. JDW
	if (rate == 44100)
		delta = 0x116a;
	else if (rate == 8000)
		delta = 0x6000;
	else if (rate == 48000)
		delta = 0x1000;
	else
		delta = ((48000 << 12) / rate) & 0x0000ffff;
	return delta;
}

/*---------------------------------------------------------------------------
   snd_trident_spurious_threshold

   Description: This routine converts rate in HZ to spurious threshold.
  
   Paramters:   trident - pointer to target device class for 4DWave.
                rate - Real or Virtual channel number.
  
   Returns:     Delta value.
  
  ---------------------------------------------------------------------------*/
unsigned int snd_trident_spurious_threshold(unsigned int rate, unsigned int period_size)
{
	unsigned int res = (rate * period_size) / 48000;
	if (res < 64)
		res = res / 2;
	else
		res -= 32;
	return res;
}

/*---------------------------------------------------------------------------
   snd_trident_control_mode

   Description: This routine returns a control mode for a PCM channel.
  
   Paramters:   trident - pointer to target device class for 4DWave.
                substream  - PCM substream
  
   Returns:     Control value.
  
  ---------------------------------------------------------------------------*/
unsigned int snd_trident_control_mode(snd_pcm_substream_t *substream)
{
	unsigned int CTRL;
	snd_pcm_runtime_t *runtime = substream->runtime;

	/* set ctrl mode
	   CTRL default: 8-bit (unsigned) mono, loop mode enabled
	 */
	CTRL = 0x00000001;
	if (snd_pcm_format_width(runtime->format) == 16)
		CTRL |= 0x00000008;	// 16-bit data
	if (snd_pcm_format_signed(runtime->format))
		CTRL |= 0x00000002;	// signed data
	if (runtime->channels > 1)
		CTRL |= 0x00000004;	// stereo data
	return CTRL;
}

/*
 *  PCM part
 */

/*---------------------------------------------------------------------------
   snd_trident_ioctl
  
   Description: Device I/O control handler for playback/capture parameters.
  
   Paramters:   substream  - PCM substream class
                cmd     - what ioctl message to process
                arg     - additional message infoarg     
  
   Returns:     Error status
  
  ---------------------------------------------------------------------------*/

static int snd_trident_ioctl(snd_pcm_substream_t * substream,
			     unsigned int cmd,
			     void *arg)
{
	/* FIXME: it seems that with small periods the behaviour of
	          trident hardware is unpredictable and interrupt generator
	          is broken */
	return snd_pcm_lib_ioctl(substream, cmd, arg);
}

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

static int snd_trident_playback_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;
	snd_trident_voice_t *evoice = voice->extra;
	unsigned long flags;
	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;
	}

	/* voice management */

	if (params_buffer_size(hw_params) / 2 != params_period_size(hw_params)) {
		if (evoice == NULL) {
			evoice = snd_trident_alloc_voice(trident, SNDRV_TRIDENT_VOICE_TYPE_PCM, 0, 0);
			if (evoice == NULL)
				return -ENOMEM;
			voice->extra = evoice;
			evoice->substream = substream;
		}
	} else {
		if (evoice != NULL) {
			snd_trident_free_voice(trident, evoice);
			voice->extra = evoice = NULL;
		}
	}

	return 0;
}

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

static int snd_trident_playback_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_playback_prepare
  
   Description: Prepare playback device for playback.
  
   Parameters:  substream  - PCM substream class
  
   Returns:     Error status
  
  ---------------------------------------------------------------------------*/

static int snd_trident_playback_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;