azt3328.c

linux 内核源代码

	/* val = 0xff0d; 41m23.135s (5523,600Hz; -> 5512Hz???) */
	/* val = 0xff0e; 28m30.777s (8017Hz; -> 8000Hz???) */

	if (channels == 2)
		val |= SOUNDFORMAT_FLAG_2CHANNELS;

	if (format_width == 16)
		val |= SOUNDFORMAT_FLAG_16BIT;

	spin_lock_irqsave(&chip->reg_lock, flags);
	
	/* set bitrate/format */
	snd_azf3328_codec_outw(chip, reg, val);
	
	/* changing the bitrate/format settings switches off the
	 * audio output with an annoying click in case of 8/16bit format change
	 * (maybe shutting down DAC/ADC?), thus immediately
	 * do some tweaking to reenable it and get rid of the clicking
	 * (FIXME: yes, it works, but what exactly am I doing here?? :)
	 * FIXME: does this have some side effects for full-duplex
	 * or other dramatic side effects? */
	if (reg == IDX_IO_PLAY_SOUNDFORMAT) /* only do it for playback */
		snd_azf3328_codec_outw(chip, IDX_IO_PLAY_FLAGS,
			snd_azf3328_codec_inw(chip, IDX_IO_PLAY_FLAGS) |
			DMA_PLAY_SOMETHING1 |
			DMA_PLAY_SOMETHING2 |
			SOMETHING_ALMOST_ALWAYS_SET |
			DMA_EPILOGUE_SOMETHING |
			DMA_SOMETHING_ELSE
		);

	spin_unlock_irqrestore(&chip->reg_lock, flags);
	snd_azf3328_dbgcallleave();
}

static void
snd_azf3328_setdmaa(struct snd_azf3328 *chip,
				long unsigned int addr,
                                unsigned int count,
                                unsigned int size,
				int do_recording)
{
	unsigned long flags, portbase;
	unsigned int is_running;

	snd_azf3328_dbgcallenter();
	if (do_recording) {
		/* access capture registers, i.e. skip playback reg section */
		portbase = chip->codec_port + 0x20;
		is_running = chip->is_recording;
	} else {
		/* access the playback register section */
		portbase = chip->codec_port + 0x00;
		is_running = chip->is_playing;
	}

	/* AZF3328 uses a two buffer pointer DMA playback approach */
	if (!is_running) {
		unsigned long addr_area2;
		unsigned long count_areas, count_tmp; /* width 32bit -- overflow!! */
		count_areas = size/2;
		addr_area2 = addr+count_areas;
		count_areas--; /* max. index */
		snd_azf3328_dbgplay("set DMA: buf1 %08lx[%lu], buf2 %08lx[%lu]\n", addr, count_areas, addr_area2, count_areas);

		/* build combined I/O buffer length word */
		count_tmp = count_areas;
		count_areas |= (count_tmp << 16);
		spin_lock_irqsave(&chip->reg_lock, flags);
		outl(addr, portbase + IDX_IO_PLAY_DMA_START_1);
		outl(addr_area2, portbase + IDX_IO_PLAY_DMA_START_2);
		outl(count_areas, portbase + IDX_IO_PLAY_DMA_LEN_1);
		spin_unlock_irqrestore(&chip->reg_lock, flags);
	}
	snd_azf3328_dbgcallleave();
}

static int
snd_azf3328_playback_prepare(struct snd_pcm_substream *substream)
{
#if 0
	struct snd_azf3328 *chip = snd_pcm_substream_chip(substream);
	struct snd_pcm_runtime *runtime = substream->runtime;
        unsigned int size = snd_pcm_lib_buffer_bytes(substream);
	unsigned int count = snd_pcm_lib_period_bytes(substream);
#endif

	snd_azf3328_dbgcallenter();
#if 0
	snd_azf3328_setfmt(chip, IDX_IO_PLAY_SOUNDFORMAT,
		runtime->rate,
		snd_pcm_format_width(runtime->format),
		runtime->channels);
	snd_azf3328_setdmaa(chip, runtime->dma_addr, count, size, 0);
#endif
	snd_azf3328_dbgcallleave();
	return 0;
}

static int
snd_azf3328_capture_prepare(struct snd_pcm_substream *substream)
{
#if 0
	struct snd_azf3328 *chip = snd_pcm_substream_chip(substream);
	struct snd_pcm_runtime *runtime = substream->runtime;
        unsigned int size = snd_pcm_lib_buffer_bytes(substream);
	unsigned int count = snd_pcm_lib_period_bytes(substream);
#endif

	snd_azf3328_dbgcallenter();
#if 0
	snd_azf3328_setfmt(chip, IDX_IO_REC_SOUNDFORMAT,
		runtime->rate,
		snd_pcm_format_width(runtime->format),
		runtime->channels);
	snd_azf3328_setdmaa(chip, runtime->dma_addr, count, size, 1);
#endif
	snd_azf3328_dbgcallleave();
	return 0;
}

static int
snd_azf3328_playback_trigger(struct snd_pcm_substream *substream, int cmd)
{
	struct snd_azf3328 *chip = snd_pcm_substream_chip(substream);
	struct snd_pcm_runtime *runtime = substream->runtime;
	int result = 0;
	unsigned int status1;

	snd_azf3328_dbgcalls("snd_azf3328_playback_trigger cmd %d\n", cmd);

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
		snd_azf3328_dbgplay("START PLAYBACK\n");

		/* mute WaveOut */
		snd_azf3328_mixer_set_mute(chip, IDX_MIXER_WAVEOUT, 1);

		snd_azf3328_setfmt(chip, IDX_IO_PLAY_SOUNDFORMAT,
			runtime->rate,
			snd_pcm_format_width(runtime->format),
			runtime->channels);

		spin_lock(&chip->reg_lock);
		/* stop playback */
		status1 = snd_azf3328_codec_inw(chip, IDX_IO_PLAY_FLAGS);
		status1 &= ~DMA_RESUME;
		snd_azf3328_codec_outw(chip, IDX_IO_PLAY_FLAGS, status1);
	    
		/* FIXME: clear interrupts or what??? */
		snd_azf3328_codec_outw(chip, IDX_IO_PLAY_IRQTYPE, 0xffff);
		spin_unlock(&chip->reg_lock);

		snd_azf3328_setdmaa(chip, runtime->dma_addr,
			snd_pcm_lib_period_bytes(substream),
			snd_pcm_lib_buffer_bytes(substream),
			0);

		spin_lock(&chip->reg_lock);
#ifdef WIN9X
		/* FIXME: enable playback/recording??? */
		status1 |= DMA_PLAY_SOMETHING1 | DMA_PLAY_SOMETHING2;
		snd_azf3328_codec_outw(chip, IDX_IO_PLAY_FLAGS, status1);

		/* start playback again */
		/* FIXME: what is this value (0x0010)??? */
		status1 |= DMA_RESUME | DMA_EPILOGUE_SOMETHING;
		snd_azf3328_codec_outw(chip, IDX_IO_PLAY_FLAGS, status1);
#else /* NT4 */
		snd_azf3328_codec_outw(chip, IDX_IO_PLAY_FLAGS,
			0x0000);
		snd_azf3328_codec_outw(chip, IDX_IO_PLAY_FLAGS,
			DMA_PLAY_SOMETHING1);
		snd_azf3328_codec_outw(chip, IDX_IO_PLAY_FLAGS,
			DMA_PLAY_SOMETHING1 |
			DMA_PLAY_SOMETHING2);
		snd_azf3328_codec_outw(chip, IDX_IO_PLAY_FLAGS,
			DMA_RESUME |
			SOMETHING_ALMOST_ALWAYS_SET |
			DMA_EPILOGUE_SOMETHING |
			DMA_SOMETHING_ELSE);
#endif
		spin_unlock(&chip->reg_lock);

		/* now unmute WaveOut */
		snd_azf3328_mixer_set_mute(chip, IDX_MIXER_WAVEOUT, 0);

		chip->is_playing = 1;
		snd_azf3328_dbgplay("STARTED PLAYBACK\n");
		break;
	case SNDRV_PCM_TRIGGER_RESUME:
		snd_azf3328_dbgplay("RESUME PLAYBACK\n");
		/* resume playback if we were active */
		if (chip->is_playing)
			snd_azf3328_codec_outw(chip, IDX_IO_PLAY_FLAGS,
				snd_azf3328_codec_inw(chip, IDX_IO_PLAY_FLAGS) | DMA_RESUME);
		break;
	case SNDRV_PCM_TRIGGER_STOP:
		snd_azf3328_dbgplay("STOP PLAYBACK\n");

		/* mute WaveOut */
		snd_azf3328_mixer_set_mute(chip, IDX_MIXER_WAVEOUT, 1);

		spin_lock(&chip->reg_lock);
		/* stop playback */
		status1 = snd_azf3328_codec_inw(chip, IDX_IO_PLAY_FLAGS);

		status1 &= ~DMA_RESUME;
		snd_azf3328_codec_outw(chip, IDX_IO_PLAY_FLAGS, status1);

		/* hmm, is this really required? we're resetting the same bit
		 * immediately thereafter... */
		status1 |= DMA_PLAY_SOMETHING1;
		snd_azf3328_codec_outw(chip, IDX_IO_PLAY_FLAGS, status1);

		status1 &= ~DMA_PLAY_SOMETHING1;
		snd_azf3328_codec_outw(chip, IDX_IO_PLAY_FLAGS, status1);
		spin_unlock(&chip->reg_lock);
	    
		/* now unmute WaveOut */
		snd_azf3328_mixer_set_mute(chip, IDX_MIXER_WAVEOUT, 0);
		chip->is_playing = 0;
		snd_azf3328_dbgplay("STOPPED PLAYBACK\n");
		break;
	case SNDRV_PCM_TRIGGER_SUSPEND:
		snd_azf3328_dbgplay("SUSPEND PLAYBACK\n");
		/* make sure playback is stopped */
		snd_azf3328_codec_outw(chip, IDX_IO_PLAY_FLAGS,
			snd_azf3328_codec_inw(chip, IDX_IO_PLAY_FLAGS) & ~DMA_RESUME);
		break;
        case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
		snd_printk(KERN_ERR "FIXME: SNDRV_PCM_TRIGGER_PAUSE_PUSH NIY!\n");
                break;
        case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
		snd_printk(KERN_ERR "FIXME: SNDRV_PCM_TRIGGER_PAUSE_RELEASE NIY!\n");
                break;
        default:
		printk(KERN_ERR "FIXME: unknown trigger mode!\n");
                return -EINVAL;
	}
	
	snd_azf3328_dbgcallleave();
	return result;
}

/* this is just analogous to playback; I'm not quite sure whether recording
 * should actually be triggered like that */
static int
snd_azf3328_capture_trigger(struct snd_pcm_substream *substream, int cmd)
{
	struct snd_azf3328 *chip = snd_pcm_substream_chip(substream);
	struct snd_pcm_runtime *runtime = substream->runtime;
	int result = 0;
	unsigned int status1;

	snd_azf3328_dbgcalls("snd_azf3328_capture_trigger cmd %d\n", cmd);

        switch (cmd) {
        case SNDRV_PCM_TRIGGER_START:

		snd_azf3328_dbgplay("START CAPTURE\n");

		snd_azf3328_setfmt(chip, IDX_IO_REC_SOUNDFORMAT,
			runtime->rate,
			snd_pcm_format_width(runtime->format),
			runtime->channels);

		spin_lock(&chip->reg_lock);
		/* stop recording */
		status1 = snd_azf3328_codec_inw(chip, IDX_IO_REC_FLAGS);
		status1 &= ~DMA_RESUME;
		snd_azf3328_codec_outw(chip, IDX_IO_REC_FLAGS, status1);
	    
		/* FIXME: clear interrupts or what??? */
		snd_azf3328_codec_outw(chip, IDX_IO_REC_IRQTYPE, 0xffff);
		spin_unlock(&chip->reg_lock);

		snd_azf3328_setdmaa(chip, runtime->dma_addr,
			snd_pcm_lib_period_bytes(substream),
			snd_pcm_lib_buffer_bytes(substream),
			1);

		spin_lock(&chip->reg_lock);
#ifdef WIN9X
		/* FIXME: enable playback/recording??? */
		status1 |= DMA_PLAY_SOMETHING1 | DMA_PLAY_SOMETHING2;
		snd_azf3328_codec_outw(chip, IDX_IO_REC_FLAGS, status1);

		/* start capture again */
		/* FIXME: what is this value (0x0010)??? */
		status1 |= DMA_RESUME | DMA_EPILOGUE_SOMETHING;
		snd_azf3328_codec_outw(chip, IDX_IO_REC_FLAGS, status1);
#else
		snd_azf3328_codec_outw(chip, IDX_IO_REC_FLAGS,
			0x0000);
		snd_azf3328_codec_outw(chip, IDX_IO_REC_FLAGS,
			DMA_PLAY_SOMETHING1);
		snd_azf3328_codec_outw(chip, IDX_IO_REC_FLAGS,
			DMA_PLAY_SOMETHING1 |
			DMA_PLAY_SOMETHING2);
		snd_azf3328_codec_outw(chip, IDX_IO_REC_FLAGS,
			DMA_RESUME |
			SOMETHING_ALMOST_ALWAYS_SET |
			DMA_EPILOGUE_SOMETHING |
			DMA_SOMETHING_ELSE);
#endif
		spin_unlock(&chip->reg_lock);

		chip->is_recording = 1;
		snd_azf3328_dbgplay("STARTED CAPTURE\n");
		break;
	case SNDRV_PCM_TRIGGER_RESUME:
		snd_azf3328_dbgplay("RESUME CAPTURE\n");
		/* resume recording if we were active */
		if (chip->is_recording)
			snd_azf3328_codec_outw(chip, IDX_IO_REC_FLAGS,
				snd_azf3328_codec_inw(chip, IDX_IO_REC_FLAGS) | DMA_RESUME);
		break;
        case SNDRV_PCM_TRIGGER_STOP:
		snd_azf3328_dbgplay("STOP CAPTURE\n");

		spin_lock(&chip->reg_lock);
		/* stop recording */
		status1 = snd_azf3328_codec_inw(chip, IDX_IO_REC_FLAGS);

		status1 &= ~DMA_RESUME;
		snd_azf3328_codec_outw(chip, IDX_IO_REC_FLAGS, status1);

		status1 |= DMA_PLAY_SOMETHING1;
		snd_azf3328_codec_outw(chip, IDX_IO_REC_FLAGS, status1);

		status1 &= ~DMA_PLAY_SOMETHING1;
		snd_azf3328_codec_outw(chip, IDX_IO_REC_FLAGS, status1);
		spin_unlock(&chip->reg_lock);
	    
		chip->is_recording = 0;
		snd_azf3328_dbgplay("STOPPED CAPTURE\n");
		break;
	case SNDRV_PCM_TRIGGER_SUSPEND:
		snd_azf3328_dbgplay("SUSPEND CAPTURE\n");
		/* make sure recording is stopped */
		snd_azf3328_codec_outw(chip, IDX_IO_REC_FLAGS,
			snd_azf3328_codec_inw(chip, IDX_IO_REC_FLAGS) & ~DMA_RESUME);
		break;
        case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
		snd_printk(KERN_ERR "FIXME: SNDRV_PCM_TRIGGER_PAUSE_PUSH NIY!\n");
                break;
        case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
		snd_printk(KERN_ERR "FIXME: SNDRV_PCM_TRIGGER_PAUSE_RELEASE NIY!\n");
                break;
        default:
		printk(KERN_ERR "FIXME: unknown trigger mode!\n");
                return -EINVAL;
	}
	
	snd_azf3328_dbgcallleave();
	return result;
}

static snd_pcm_uframes_t
snd_azf3328_playback_pointer(struct snd_pcm_substream *substream)
{
	struct snd_azf3328 *chip = snd_pcm_substream_chip(substream);
	unsigned long bufptr, result;
	snd_pcm_uframes_t frmres;

#ifdef QUERY_HARDWARE
	bufptr = inl(chip->codec_port+IDX_IO_PLAY_DMA_START_1);
#else
	bufptr = substream->runtime->dma_addr;
#endif
	result = inl(chip->codec_port+IDX_IO_PLAY_DMA_CURRPOS);

	/* calculate offset */
	result -= bufptr;
	frmres = bytes_to_frames( substream->runtime, result);
	snd_azf3328_dbgplay("PLAY @ 0x%8lx, frames %8ld\n", result, frmres);
	return frmres;
}

static snd_pcm_uframes_t
snd_azf3328_capture_pointer(struct snd_pcm_substream *substream)
{
	struct snd_azf3328 *chip = snd_pcm_substream_chip(substream);
	unsigned long bufptr, result;
	snd_pcm_uframes_t frmres;

#ifdef QUERY_HARDWARE
	bufptr = inl(chip->codec_port+IDX_IO_REC_DMA_START_1);
#else
	bufptr = substream->runtime->dma_addr;
#endif
	result = inl(chip->codec_port+IDX_IO_REC_DMA_CURRPOS);

	/* calculate offset */
	result -= bufptr;
	frmres = bytes_to_frames( substream->runtime, result);
	snd_azf3328_dbgplay("REC  @ 0x%8lx, frames %8ld\n", result, frmres);
	return frmres;