ali5451.c

是关于linux2.5.1的完全源码

	if (rate < 4000)  rate = 4000;
	if (rate > 48000) rate = 48000;

	if (rec) {
		if (rate == 44100)
			delta = 0x116a;
		else if (rate == 8000)
			delta = 0x6000;
		else if (rate == 48000)
			delta = 0x1000;
		else
			delta = ((48000 << 12) / rate) & 0x0000ffff;
	} else {
		if (rate == 44100)
			delta = 0xeb3;
		else if (rate == 8000)
			delta = 0x2ab;
		else if (rate == 48000)
			delta = 0x1000;
		else 
			delta = (((rate << 12) + rate) / 48000) & 0x0000ffff;
	}

	return delta;
}

static unsigned int snd_ali_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_unsigned(runtime->format))
		CTRL |= 0x00000002;	// signed data
	if (runtime->channels > 1)
		CTRL |= 0x00000004;	// stereo data
	return CTRL;
}

/*
 *  PCM part
 */

static int snd_ali_ioctl(snd_pcm_substream_t * substream,
				  unsigned int cmd, void *arg)
{
	return snd_pcm_lib_ioctl(substream, cmd, arg);
}

static int snd_ali_trigger(snd_pcm_substream_t *substream,
			       int cmd)
				    
{
	ali_t *codec = snd_pcm_substream_chip(substream);
	snd_pcm_substream_t *s;
	unsigned int what, whati, capture_flag;
	snd_ali_voice_t *pvoice = NULL, *evoice = NULL;
	unsigned int val;

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
	case SNDRV_PCM_TRIGGER_STOP:
	{
		what = whati = capture_flag = 0;
		s = substream;
		do {
			if ((ali_t *) _snd_pcm_chip(s->pcm) == codec) {
				pvoice = (snd_ali_voice_t *) s->runtime->private_data;
				evoice = pvoice->extra;
				what |= 1 << (pvoice->number & 0x1f);
				if (evoice == NULL) {
					whati |= 1 << (pvoice->number & 0x1f);
				} else {
					whati |= 1 << (evoice->number & 0x1f);
					what |= 1 << (evoice->number & 0x1f);
				}
				if (cmd == SNDRV_PCM_TRIGGER_START) {
					pvoice->running = 1;
					if (evoice != NULL)
						evoice->running = 1;
				}
				snd_pcm_trigger_done(s, substream);
				if (pvoice->mode)
					capture_flag = 1;
			}
			s = s->link_next;
		} while (s != substream);
		spin_lock(&codec->reg_lock);
		if (cmd == SNDRV_PCM_TRIGGER_STOP) {
			outl(what, ALI_REG(codec, ALI_STOP));
			pvoice->running = 0;
			if (evoice != NULL)
				evoice->running = 0;
		}
		val = inl(ALI_REG(codec, ALI_AINTEN));
		if (cmd == SNDRV_PCM_TRIGGER_START) {
			val |= whati;
		} else {
			val &= ~whati;
		}
		outl(val, ALI_REG(codec, ALI_AINTEN));
		if (cmd == SNDRV_PCM_TRIGGER_START) {
			outl(what, ALI_REG(codec, ALI_START));
		}
		snd_ali_printk("trigger: what=%xh whati=%xh\n",what,whati);
		spin_unlock(&codec->reg_lock);
		break;
	}
	default:
		return -EINVAL;
	}
	return 0;
}

static int snd_ali_playback_hw_params(snd_pcm_substream_t * substream,
				 snd_pcm_hw_params_t * hw_params)
{
	ali_t *codec = snd_pcm_substream_chip(substream);
	snd_pcm_runtime_t *runtime = substream->runtime;
	snd_ali_voice_t *pvoice = (snd_ali_voice_t *) runtime->private_data;
	snd_ali_voice_t *evoice = pvoice->extra;
	int err;
	err = snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(hw_params));
	if (err < 0) return err;
	
	/* voice management */

	if (params_buffer_size(hw_params)/2 != params_period_size(hw_params)) {
		if (evoice == NULL) {
			evoice = snd_ali_alloc_voice(codec, SNDRV_ALI_VOICE_TYPE_PCM, 0);
			if (evoice == NULL)
				return -ENOMEM;
			pvoice->extra = evoice;
			evoice->substream = substream;
		}
	} else {
		if (evoice != NULL) {
			snd_ali_free_voice(codec, evoice);
			pvoice->extra = evoice = NULL;
		}
	}

	return 0;
}

static int snd_ali_playback_hw_free(snd_pcm_substream_t * substream)
{
	ali_t *codec = snd_pcm_substream_chip(substream);
	snd_pcm_runtime_t *runtime = substream->runtime;
	snd_ali_voice_t *pvoice = (snd_ali_voice_t *) runtime->private_data;
	snd_ali_voice_t *evoice = pvoice ? pvoice->extra : NULL;

	snd_pcm_lib_free_pages(substream);
	if (evoice != NULL) {
		snd_ali_free_voice(codec, evoice);
		pvoice->extra = NULL;
	}
	return 0;
}

static int snd_ali_capture_hw_params(snd_pcm_substream_t * substream,
				 snd_pcm_hw_params_t * hw_params)
{
	return snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(hw_params));
}

static int snd_ali_capture_hw_free(snd_pcm_substream_t * substream)
{
	return snd_pcm_lib_free_pages(substream);
}

static int snd_ali_playback_prepare(snd_pcm_substream_t * substream)
{
	ali_t *codec = snd_pcm_substream_chip(substream);
	snd_pcm_runtime_t *runtime = substream->runtime;
	snd_ali_voice_t *pvoice = (snd_ali_voice_t *) runtime->private_data;
	snd_ali_voice_t *evoice = pvoice->extra;
	unsigned long flags;

	unsigned int LBA;
	unsigned int Delta;
	unsigned int ESO;
	unsigned int CTRL;
	unsigned int GVSEL;
	unsigned int PAN;
	unsigned int VOL;
	unsigned int EC;
	
	snd_ali_printk("playback_prepare ...\n");

	spin_lock_irqsave(&codec->reg_lock, flags);	
	
	/* set Delta (rate) value */
	Delta = snd_ali_convert_rate(runtime->rate, 0);

	if ((pvoice->number == ALI_SPDIF_IN_CHANNEL) || 
	    (pvoice->number == ALI_PCM_IN_CHANNEL))
		snd_ali_disable_special_channel(codec, pvoice->number);
	else if ((inl(ALI_REG(codec, ALI_GLOBAL_CONTROL)) & (1<<15)) 
		&& (pvoice->number == ALI_SPDIF_OUT_CHANNEL)) {
		if (codec->revision == ALI_5451_V02) {
			snd_ali_set_spdif_out_rate(codec, runtime->rate);
			Delta = 0x1000;
		}
	}
	
	/* set Loop Back Address */
	LBA = runtime->dma_addr;

	/* set interrupt count size */
	pvoice->count = runtime->period_size;

	/* set target ESO for channel */
	pvoice->eso = runtime->buffer_size; 

	snd_ali_printk("playback_prepare: eso=%xh count=%xh\n",pvoice->eso,pvoice->count);

	/* set ESO to capture first MIDLP interrupt */
	ESO = pvoice->eso -1;
	/* set ctrl mode */
	CTRL = snd_ali_control_mode(substream);

	GVSEL = 1;
	PAN = 0;
	VOL = 0;
	EC = 0;
	snd_ali_printk("playback_prepare:\n    ch=%d, Rate=%d Delta=%xh,GVSEL=%xh,PAN=%xh,CTRL=%xh\n",pvoice->number,runtime->rate,Delta,GVSEL,PAN,CTRL);
	snd_ali_write_voice_regs(    codec,
				     pvoice->number,
				     LBA,
				     0,	/* cso */
				     ESO,
				     Delta,
				     0,	/* alpha */
				     GVSEL,
				     PAN,
				     VOL,
				     CTRL,
				     EC);
	if (evoice != NULL) {
		evoice->count = pvoice->count;
		evoice->eso = pvoice->count << 1;
		ESO = evoice->eso - 1;
		snd_ali_write_voice_regs(codec,
				     evoice->number,
				     LBA,
				     0,	/* cso */
				     ESO,
				     Delta,
				     0,	/* alpha */
				     GVSEL,
				     (unsigned int)0x7f,
				     (unsigned int)0x3ff,
				     CTRL,
				     EC);
	}
	spin_unlock_irqrestore(&codec->reg_lock, flags);
	return 0;
}


static int snd_ali_capture_prepare(snd_pcm_substream_t * substream)
{
	ali_t *codec = snd_pcm_substream_chip(substream);
	snd_pcm_runtime_t *runtime = substream->runtime;
	snd_ali_voice_t *pvoice = (snd_ali_voice_t *) runtime->private_data;
	unsigned long flags;
	unsigned int LBA;
	unsigned int Delta;
	unsigned int ESO;
	unsigned int CTRL;
	unsigned int GVSEL;
	unsigned int PAN;
	unsigned int VOL;
	unsigned int EC;
	u8	 bValue;

	spin_lock_irqsave(&codec->reg_lock, flags);

	snd_ali_printk("capture_prepare...\n");

	snd_ali_enable_special_channel(codec,pvoice->number);

	Delta = snd_ali_convert_rate(runtime->rate, 1);

	// Prepare capture intr channel
	if (pvoice->number == ALI_SPDIF_IN_CHANNEL) {

		unsigned int rate;
		
		if (codec->revision != ALI_5451_V02)
			return -1;
		rate = snd_ali_get_spdif_in_rate(codec);
		if (rate == 0) {
			snd_printk("ali_capture_preapre: spdif rate detect err!\n");
			rate = 48000;
		}
		bValue = inb(ALI_REG(codec,ALI_SPDIF_CTRL));
		if (bValue & 0x10) {
			outb(bValue,ALI_REG(codec,ALI_SPDIF_CTRL));
			printk("clear SPDIF parity error flag.\n");
		}

		if (rate != 48000)
			Delta = ((rate << 12)/runtime->rate)&0x00ffff;
	}

	// set target ESO for channel 
	pvoice->eso = runtime->buffer_size; 

	// set interrupt count size 
	pvoice->count = runtime->period_size;

	// set Loop Back Address 
	LBA = runtime->dma_addr;

	// set ESO to capture first MIDLP interrupt 
	ESO = pvoice->eso - 1;
	CTRL = snd_ali_control_mode(substream);
	GVSEL = 0;
	PAN = 0x00;
	VOL = 0x00;
	EC = 0;

	snd_ali_write_voice_regs(    codec,
				     pvoice->number,
				     LBA,
				     0,	/* cso */
				     ESO,
				     Delta,
				     0,	/* alpha */
				     GVSEL,
				     PAN,
				     VOL,
				     CTRL,
				     EC);


	spin_unlock_irqrestore(&codec->reg_lock, flags);

	return 0;
}


static snd_pcm_uframes_t snd_ali_playback_pointer(snd_pcm_substream_t *substream)
{
	ali_t *codec = snd_pcm_substream_chip(substream);
	snd_pcm_runtime_t *runtime = substream->runtime;
	snd_ali_voice_t *pvoice = (snd_ali_voice_t *) runtime->private_data;
	unsigned int cso;
	unsigned long flags;

	spin_lock_irqsave(&codec->reg_lock, flags);
	if (!pvoice->running) {
		spin_unlock_irqrestore(&codec->reg_lock, flags);
		return 0;
	}
	outb(pvoice->number, ALI_REG(codec, ALI_GC_CIR));
	cso = inw(ALI_REG(codec, ALI_CSO_ALPHA_FMS + 2));
	spin_unlock_irqrestore(&codec->reg_lock, flags);
	snd_ali_printk("playback pointer returned cso=%xh.\n", cso);

	return cso;
}


static snd_pcm_uframes_t snd_ali_capture_pointer(snd_pcm_substream_t *substream)
{
	ali_t *codec = snd_pcm_substream_chip(substream);
	snd_pcm_runtime_t *runtime = substream->runtime;
	snd_ali_voice_t *pvoice = (snd_ali_voice_t *) runtime->private_data;
	unsigned int cso;
	unsigned long flags;

	spin_lock_irqsave(&codec->reg_lock, flags);
	if (!pvoice->running) {
		spin_unlock_irqrestore(&codec->reg_lock, flags);
		return 0;
	}
	outb(pvoice->number, ALI_REG(codec, ALI_GC_CIR));
	cso = inw(ALI_REG(codec, ALI_CSO_ALPHA_FMS + 2));
	spin_unlock_irqrestore(&codec->reg_lock, flags);

	return cso;
}

static snd_pcm_hardware_t snd_ali_playback =
{
	info:			(SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
				 SNDRV_PCM_INFO_BLOCK_TRANSFER |
				 SNDRV_PCM_INFO_MMAP_VALID | SNDRV_PCM_INFO_SYNC_START),
	formats:		(SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S16_LE |
				 SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_U16_LE),
	rates:			SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_8000_48000,
	rate_min:		4000,
	rate_max:		48000,
	channels_min:		1,
	channels_max:		2,
	buffer_bytes_max:	(256*1024),
	period_bytes_min:	64,
	period_bytes_max:	(256*1024),
	periods_min:		1,
	periods_max:		1024,
	fifo_size:		0,
};

/*
 *  Capture support device description
 */

static snd_pcm_hardware_t snd_ali_capture =
{
	info:			(SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
				 SNDRV_PCM_INFO_BLOCK_TRANSFER |
				 SNDRV_PCM_INFO_MMAP_VALID | SNDRV_PCM_INFO_SYNC_START),
	formats:		(SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S16_LE |
				 SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_U16_LE),
	rates:			SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_8000_48000,
	rate_min:		4000,
	rate_max:		48000,
	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,
};

static void snd_ali_pcm_free_substream(snd_pcm_runtime_t *runtime)
{
	unsigned long flags;
	snd_ali_voice_t *pvoice = (snd_ali_voice_t *) runtime->private_data;
	ali_t *codec;

	if (pvoice) {
		codec = pvoice->codec;
		spin_lock_irqsave(&codec->reg_lock, flags);
		snd_ali_free_voice(pvoice->codec, pvoice);
		spin_unlock_irqrestore(&codec->reg_lock, flags);
	}
}

static int snd_ali_playback_open(snd_pcm_substream_t * substream)
{
	ali_t *codec = snd_pcm_substream_chip(substream);
	snd_pcm_runtime_t *runtime = substream->runtime;
	snd_ali_voice_t *pvoice;
	unsigned long flags = 0;

	spin_lock_irqsave(&codec->reg_lock, flags);
	pvoice = snd_ali_alloc_voice(codec, SNDRV_ALI_VOICE_TYPE_PCM, 0);
	if (pvoice == NULL) {
		spin_unlock_irqrestore(&codec->reg_lock, flags);
		return -EAGAIN;
	}
	pvoice->codec = codec;
	spin_unlock_irqrestore(&codec->reg_lock, flags);

	pvoice->substream = substream;
	runtime->private_data = pvoice;
	runtime->private_free = snd_ali_pcm_free_substream;

	runtime->hw = snd_ali_playback;
	snd_pcm_set_sync(substream);
	snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 0, 64*1024);
	return 0;
}


static int snd_ali_capture_open(snd_pcm_substream_t * substream)
{
	ali_t *codec = snd_pcm_substream_chip(substream);
	snd_pcm_runtime_t *runtime = substream->runtime;
	snd_ali_voice_t *pvoice;
	unsigned long flags;

	spin_lock_irqsave(&codec->reg_lock, flags);
	pvoice = snd_ali_alloc_voice(codec, SNDRV_ALI_VOICE_TYPE_PCM, 1);
	if (pvoice == NULL) {
		spin_unlock_irqrestore(&codec->reg_lock, flags);
		return -EAGAIN;
	}
	pvoice->codec = codec;
	spin_unlock_irqrestore(&codec->reg_lock, flags);

	pvoice->substream = substream;
	runtime->private_data = pvoice;
	runtime->private_free = snd_ali_pcm_free_substream;
	runtime->hw = snd_ali_capture;
	snd_pcm_set_sync(substream);
	snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 0, 64*1024);
	return 0;
}


static int snd_ali_playback_close(snd_pcm_substream_t * substream)
{
	return 0;
}

static int snd_ali_capture_close(snd_pcm_substream_t * substream)
{
	ali_t *codec = snd_pcm_substream_chip(substream);
	snd_pcm_runtime_t *runtime = substream->runtime;
	snd_ali_voice_t *pvoice = (snd_ali_voice_t *) runtime->private_data;

	snd_ali_disable_special_channel(codec,pvoice->number);

	return 0;
}

static snd_pcm_ops_t snd_ali_playback_ops = {
	open:		snd_ali_playback_open,
	close:		snd_ali_playback_close,
	ioctl:		snd_ali_ioctl,
	hw_params:	snd_ali_playback_hw_params,
	hw_free:	snd_ali_playback_hw_free,
	prepare:	snd_ali_playback_prepare,
	trigger:	snd_ali_trigger,
	pointer:	snd_ali_playback_pointer,
};

static snd_pcm_ops_t snd_ali_capture_ops = {
	open:		snd_ali_capture_open,
	close:		snd_ali_capture_close,
	ioctl:		snd_ali_ioctl,
	hw_params:	snd_ali_capture_hw_params,
	hw_free:	snd_ali_capture_hw_free,
	prepare:	snd_ali_capture_prepare,
	trigger:	snd_ali_trigger,
	pointer:	snd_ali_capture_pointer,
};


static void snd_ali_pcm_free(snd_pcm_t *pcm)
{
	ali_t *codec = snd_magic_cast(ali_t, pcm->private_data, return);
	codec->pcm = NULL;
}

static int __devinit snd_ali_pcm(ali_t * codec, int device, snd_pcm_t ** rpcm)
{
	snd_pcm_t *pcm;
	int err;

	if (rpcm) *rpcm = NULL;
	err = snd_pcm_new(codec->card, "ALI 5451", device, ALI_CHANNELS, 1, &pcm);
	if (err < 0) {
		snd_printk("snd_ali_pcm: err called snd_pcm_new.\n");
		return err;
	}
	pcm->private_data = codec;
	pcm->private_free = snd_ali_pcm_free;
	pcm->info_flags = 0;
	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_ali_playback_ops);
	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_ali_capture_ops);

	snd_pcm_lib_preallocate_pci_pages_for_all(codec->pci, pcm, 64*1024, 128*1024);

	pcm->info_flags = 0;
	pcm->dev_subclass = SNDRV_PCM_SUBCLASS_GENERIC_MIX;
	strcpy(pcm->name, "ALI 5451");
	codec->pcm = pcm;
	if (rpcm) *rpcm = pcm;
	return 0;