ali5451.c

鼎力推荐！本程序是基于嵌入式LUNUX系统开发的源程序代码

		      ((CTRL & 0x0000000f) << 12) |
		      (EC & 0x00000fff);

	outb(Channel, ALI_REG(codec, ALI_GC_CIR));

	outl(ctlcmds[0], ALI_REG(codec,ALI_CSO_ALPHA_FMS));
	outl(ctlcmds[1], ALI_REG(codec,ALI_LBA));
	outl(ctlcmds[2], ALI_REG(codec,ALI_ESO_DELTA));
	outl(ctlcmds[3], ALI_REG(codec,ALI_GVSEL_PAN_VOC_CTRL_EC));

	outl(0x30000000, ALI_REG(codec, ALI_EBUF1));	/* Still Mode */
	outl(0x30000000, ALI_REG(codec, ALI_EBUF2));	/* Still Mode */
}

static unsigned int snd_ali_convert_rate(unsigned int rate, int rec)
{
	unsigned int delta;

	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);
	struct list_head *pos;
	snd_pcm_substream_t *s;
	unsigned int what, whati, capture_flag;
	snd_ali_voice_t *pvoice = NULL, *evoice = NULL;
	unsigned int val;
	int do_start;

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
	case SNDRV_PCM_TRIGGER_RESUME:
		do_start = 1; break;
	case SNDRV_PCM_TRIGGER_STOP:
	case SNDRV_PCM_TRIGGER_SUSPEND:
		do_start = 0; break;
	default:
		return -EINVAL;
	}

	what = whati = capture_flag = 0;
	snd_pcm_group_for_each(pos, substream) {
		s = snd_pcm_group_substream_entry(pos);
		if ((ali_t *) snd_pcm_substream_chip(s) == 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 (do_start) {
				pvoice->running = 1;
				if (evoice != NULL)
					evoice->running = 1;
			} else {
				pvoice->running = 0;
				if (evoice != NULL)
					evoice->running = 0;
			}
			snd_pcm_trigger_done(s, substream);
			if (pvoice->mode)
				capture_flag = 1;
		}
	}
	spin_lock(&codec->reg_lock);
	if (! do_start) {
		outl(what, ALI_REG(codec, ALI_STOP));
	}
	val = inl(ALI_REG(codec, ALI_AINTEN));
	if (do_start) {
		val |= whati;
	} else {
		val &= ~whati;
	}
	outl(val, ALI_REG(codec, ALI_AINTEN));
	if (do_start) {
		outl(what, ALI_REG(codec, ALI_START));
	}
	snd_ali_printk("trigger: what=%xh whati=%xh\n",what,whati);
	spin_unlock(&codec->reg_lock);

	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 (codec->spdif_support &&
		 (inl(ALI_REG(codec, ALI_GLOBAL_CONTROL)) & ALI_SPDIF_OUT_CH_ENABLE)
		 && (pvoice->number == ALI_SPDIF_OUT_CHANNEL)) {
		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) {
			spin_unlock_irqrestore(&codec->reg_lock, flags);			
			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;

	spin_lock(&codec->reg_lock);
	if (!pvoice->running) {
		spin_unlock(&codec->reg_lock);
		return 0;
	}
	outb(pvoice->number, ALI_REG(codec, ALI_GC_CIR));
	cso = inw(ALI_REG(codec, ALI_CSO_ALPHA_FMS + 2));
	spin_unlock(&codec->reg_lock);
	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_RESUME |
				 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_RESUME |
				 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 = pcm->private_data;