cmipci.c

linux 内核源代码

/*
 * preparation
 */

/* playback - enable spdif only on the certain condition */
static int snd_cmipci_playback_prepare(struct snd_pcm_substream *substream)
{
	struct cmipci *cm = snd_pcm_substream_chip(substream);
	int rate = substream->runtime->rate;
	int err, do_spdif, do_ac3 = 0;

	do_spdif = (rate >= 44100 &&
		    substream->runtime->format == SNDRV_PCM_FORMAT_S16_LE &&
		    substream->runtime->channels == 2);
	if (do_spdif && cm->can_ac3_hw) 
		do_ac3 = cm->dig_pcm_status & IEC958_AES0_NONAUDIO;
	if ((err = setup_spdif_playback(cm, substream, do_spdif, do_ac3)) < 0)
		return err;
	return snd_cmipci_pcm_prepare(cm, &cm->channel[CM_CH_PLAY], substream);
}

/* playback  (via device #2) - enable spdif always */
static int snd_cmipci_playback_spdif_prepare(struct snd_pcm_substream *substream)
{
	struct cmipci *cm = snd_pcm_substream_chip(substream);
	int err, do_ac3;

	if (cm->can_ac3_hw) 
		do_ac3 = cm->dig_pcm_status & IEC958_AES0_NONAUDIO;
	else
		do_ac3 = 1; /* doesn't matter */
	if ((err = setup_spdif_playback(cm, substream, 1, do_ac3)) < 0)
		return err;
	return snd_cmipci_pcm_prepare(cm, &cm->channel[CM_CH_PLAY], substream);
}

/*
 * Apparently, the samples last played on channel A stay in some buffer, even
 * after the channel is reset, and get added to the data for the rear DACs when
 * playing a multichannel stream on channel B.  This is likely to generate
 * wraparounds and thus distortions.
 * To avoid this, we play at least one zero sample after the actual stream has
 * stopped.
 */
static void snd_cmipci_silence_hack(struct cmipci *cm, struct cmipci_pcm *rec)
{
	struct snd_pcm_runtime *runtime = rec->substream->runtime;
	unsigned int reg, val;

	if (rec->needs_silencing && runtime && runtime->dma_area) {
		/* set up a small silence buffer */
		memset(runtime->dma_area, 0, PAGE_SIZE);
		reg = rec->ch ? CM_REG_CH1_FRAME2 : CM_REG_CH0_FRAME2;
		val = ((PAGE_SIZE / 4) - 1) | (((PAGE_SIZE / 4) / 2 - 1) << 16);
		snd_cmipci_write(cm, reg, val);
	
		/* configure for 16 bits, 2 channels, 8 kHz */
		if (runtime->channels > 2)
			set_dac_channels(cm, rec, 2);
		spin_lock_irq(&cm->reg_lock);
		val = snd_cmipci_read(cm, CM_REG_FUNCTRL1);
		val &= ~(CM_ASFC_MASK << (rec->ch * 3));
		val |= (4 << CM_ASFC_SHIFT) << (rec->ch * 3);
		snd_cmipci_write(cm, CM_REG_FUNCTRL1, val);
		val = snd_cmipci_read(cm, CM_REG_CHFORMAT);
		val &= ~(CM_CH0FMT_MASK << (rec->ch * 2));
		val |= (3 << CM_CH0FMT_SHIFT) << (rec->ch * 2);
		if (cm->chip_version == 68) {
			val &= ~(CM_CH0_SRATE_88K << (rec->ch * 2));
			val &= ~(CM_CH0_SRATE_96K << (rec->ch * 2));
		}
		snd_cmipci_write(cm, CM_REG_CHFORMAT, val);
	
		/* start stream (we don't need interrupts) */
		cm->ctrl |= CM_CHEN0 << rec->ch;
		snd_cmipci_write(cm, CM_REG_FUNCTRL0, cm->ctrl);
		spin_unlock_irq(&cm->reg_lock);

		msleep(1);

		/* stop and reset stream */
		spin_lock_irq(&cm->reg_lock);
		cm->ctrl &= ~(CM_CHEN0 << rec->ch);
		val = CM_RST_CH0 << rec->ch;
		snd_cmipci_write(cm, CM_REG_FUNCTRL0, cm->ctrl | val);
		snd_cmipci_write(cm, CM_REG_FUNCTRL0, cm->ctrl & ~val);
		spin_unlock_irq(&cm->reg_lock);

		rec->needs_silencing = 0;
	}
}

static int snd_cmipci_playback_hw_free(struct snd_pcm_substream *substream)
{
	struct cmipci *cm = snd_pcm_substream_chip(substream);
	setup_spdif_playback(cm, substream, 0, 0);
	restore_mixer_state(cm);
	snd_cmipci_silence_hack(cm, &cm->channel[0]);
	return snd_cmipci_hw_free(substream);
}

static int snd_cmipci_playback2_hw_free(struct snd_pcm_substream *substream)
{
	struct cmipci *cm = snd_pcm_substream_chip(substream);
	snd_cmipci_silence_hack(cm, &cm->channel[1]);
	return snd_cmipci_hw_free(substream);
}

/* capture */
static int snd_cmipci_capture_prepare(struct snd_pcm_substream *substream)
{
	struct cmipci *cm = snd_pcm_substream_chip(substream);
	return snd_cmipci_pcm_prepare(cm, &cm->channel[CM_CH_CAPT], substream);
}

/* capture with spdif (via device #2) */
static int snd_cmipci_capture_spdif_prepare(struct snd_pcm_substream *substream)
{
	struct cmipci *cm = snd_pcm_substream_chip(substream);

	spin_lock_irq(&cm->reg_lock);
	snd_cmipci_set_bit(cm, CM_REG_FUNCTRL1, CM_CAPTURE_SPDF);
	spin_unlock_irq(&cm->reg_lock);

	return snd_cmipci_pcm_prepare(cm, &cm->channel[CM_CH_CAPT], substream);
}

static int snd_cmipci_capture_spdif_hw_free(struct snd_pcm_substream *subs)
{
	struct cmipci *cm = snd_pcm_substream_chip(subs);

	spin_lock_irq(&cm->reg_lock);
	snd_cmipci_clear_bit(cm, CM_REG_FUNCTRL1, CM_CAPTURE_SPDF);
	spin_unlock_irq(&cm->reg_lock);

	return snd_cmipci_hw_free(subs);
}


/*
 * interrupt handler
 */
static irqreturn_t snd_cmipci_interrupt(int irq, void *dev_id)
{
	struct cmipci *cm = dev_id;
	unsigned int status, mask = 0;
	
	/* fastpath out, to ease interrupt sharing */
	status = snd_cmipci_read(cm, CM_REG_INT_STATUS);
	if (!(status & CM_INTR))
		return IRQ_NONE;

	/* acknowledge interrupt */
	spin_lock(&cm->reg_lock);
	if (status & CM_CHINT0)
		mask |= CM_CH0_INT_EN;
	if (status & CM_CHINT1)
		mask |= CM_CH1_INT_EN;
	snd_cmipci_clear_bit(cm, CM_REG_INT_HLDCLR, mask);
	snd_cmipci_set_bit(cm, CM_REG_INT_HLDCLR, mask);
	spin_unlock(&cm->reg_lock);

	if (cm->rmidi && (status & CM_UARTINT))
		snd_mpu401_uart_interrupt(irq, cm->rmidi->private_data);

	if (cm->pcm) {
		if ((status & CM_CHINT0) && cm->channel[0].running)
			snd_pcm_period_elapsed(cm->channel[0].substream);
		if ((status & CM_CHINT1) && cm->channel[1].running)
			snd_pcm_period_elapsed(cm->channel[1].substream);
	}
	return IRQ_HANDLED;
}

/*
 * h/w infos
 */

/* playback on channel A */
static struct snd_pcm_hardware snd_cmipci_playback =
{
	.info =			(SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
				 SNDRV_PCM_INFO_BLOCK_TRANSFER | SNDRV_PCM_INFO_PAUSE |
				 SNDRV_PCM_INFO_RESUME | SNDRV_PCM_INFO_MMAP_VALID),
	.formats =		SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S16_LE,
	.rates =		SNDRV_PCM_RATE_5512 | SNDRV_PCM_RATE_8000_48000,
	.rate_min =		5512,
	.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 =		2,
	.periods_max =		1024,
	.fifo_size =		0,
};

/* capture on channel B */
static struct snd_pcm_hardware snd_cmipci_capture =
{
	.info =			(SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
				 SNDRV_PCM_INFO_BLOCK_TRANSFER | SNDRV_PCM_INFO_PAUSE |
				 SNDRV_PCM_INFO_RESUME | SNDRV_PCM_INFO_MMAP_VALID),
	.formats =		SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S16_LE,
	.rates =		SNDRV_PCM_RATE_5512 | SNDRV_PCM_RATE_8000_48000,
	.rate_min =		5512,
	.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 =		2,
	.periods_max =		1024,
	.fifo_size =		0,
};

/* playback on channel B - stereo 16bit only? */
static struct snd_pcm_hardware snd_cmipci_playback2 =
{
	.info =			(SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
				 SNDRV_PCM_INFO_BLOCK_TRANSFER | SNDRV_PCM_INFO_PAUSE |
				 SNDRV_PCM_INFO_RESUME | SNDRV_PCM_INFO_MMAP_VALID),
	.formats =		SNDRV_PCM_FMTBIT_S16_LE,
	.rates =		SNDRV_PCM_RATE_5512 | SNDRV_PCM_RATE_8000_48000,
	.rate_min =		5512,
	.rate_max =		48000,
	.channels_min =		2,
	.channels_max =		2,
	.buffer_bytes_max =	(128*1024),
	.period_bytes_min =	64,
	.period_bytes_max =	(128*1024),
	.periods_min =		2,
	.periods_max =		1024,
	.fifo_size =		0,
};

/* spdif playback on channel A */
static struct snd_pcm_hardware snd_cmipci_playback_spdif =
{
	.info =			(SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
				 SNDRV_PCM_INFO_BLOCK_TRANSFER | SNDRV_PCM_INFO_PAUSE |
				 SNDRV_PCM_INFO_RESUME | SNDRV_PCM_INFO_MMAP_VALID),
	.formats =		SNDRV_PCM_FMTBIT_S16_LE,
	.rates =		SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000,
	.rate_min =		44100,
	.rate_max =		48000,
	.channels_min =		2,
	.channels_max =		2,
	.buffer_bytes_max =	(128*1024),
	.period_bytes_min =	64,
	.period_bytes_max =	(128*1024),
	.periods_min =		2,
	.periods_max =		1024,
	.fifo_size =		0,
};

/* spdif playback on channel A (32bit, IEC958 subframes) */
static struct snd_pcm_hardware snd_cmipci_playback_iec958_subframe =
{
	.info =			(SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
				 SNDRV_PCM_INFO_BLOCK_TRANSFER | SNDRV_PCM_INFO_PAUSE |
				 SNDRV_PCM_INFO_RESUME | SNDRV_PCM_INFO_MMAP_VALID),
	.formats =		SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE,
	.rates =		SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000,
	.rate_min =		44100,
	.rate_max =		48000,
	.channels_min =		2,
	.channels_max =		2,
	.buffer_bytes_max =	(128*1024),
	.period_bytes_min =	64,
	.period_bytes_max =	(128*1024),
	.periods_min =		2,
	.periods_max =		1024,
	.fifo_size =		0,
};

/* spdif capture on channel B */
static struct snd_pcm_hardware snd_cmipci_capture_spdif =
{
	.info =			(SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
				 SNDRV_PCM_INFO_BLOCK_TRANSFER | SNDRV_PCM_INFO_PAUSE |
				 SNDRV_PCM_INFO_RESUME | SNDRV_PCM_INFO_MMAP_VALID),
	.formats =	        SNDRV_PCM_FMTBIT_S16_LE,
	.rates =		SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000,
	.rate_min =		44100,
	.rate_max =		48000,
	.channels_min =		2,
	.channels_max =		2,
	.buffer_bytes_max =	(128*1024),
	.period_bytes_min =	64,
	.period_bytes_max =	(128*1024),
	.periods_min =		2,
	.periods_max =		1024,
	.fifo_size =		0,
};

/*
 * check device open/close
 */
static int open_device_check(struct cmipci *cm, int mode, struct snd_pcm_substream *subs)
{
	int ch = mode & CM_OPEN_CH_MASK;

	/* FIXME: a file should wait until the device becomes free
	 * when it's opened on blocking mode.  however, since the current
	 * pcm framework doesn't pass file pointer before actually opened,
	 * we can't know whether blocking mode or not in open callback..
	 */
	mutex_lock(&cm->open_mutex);
	if (cm->opened[ch]) {
		mutex_unlock(&cm->open_mutex);
		return -EBUSY;
	}
	cm->opened[ch] = mode;
	cm->channel[ch].substream = subs;
	if (! (mode & CM_OPEN_DAC)) {
		/* disable dual DAC mode */
		cm->channel[ch].is_dac = 0;
		spin_lock_irq(&cm->reg_lock);
		snd_cmipci_clear_bit(cm, CM_REG_MISC_CTRL, CM_ENDBDAC);
		spin_unlock_irq(&cm->reg_lock);
	}
	mutex_unlock(&cm->open_mutex);
	return 0;
}

static void close_device_check(struct cmipci *cm, int mode)
{
	int ch = mode & CM_OPEN_CH_MASK;

	mutex_lock(&cm->open_mutex);
	if (cm->opened[ch] == mode) {
		if (cm->channel[ch].substream) {
			snd_cmipci_ch_reset(cm, ch);
			cm->channel[ch].running = 0;
			cm->channel[ch].substream = NULL;
		}
		cm->opened[ch] = 0;
		if (! cm->channel[ch].is_dac) {
			/* enable dual DAC mode again */
			cm->channel[ch].is_dac = 1;
			spin_lock_irq(&cm->reg_lock);
			snd_cmipci_set_bit(cm, CM_REG_MISC_CTRL, CM_ENDBDAC);
			spin_unlock_irq(&cm->reg_lock);
		}
	}
	mutex_unlock(&cm->open_mutex);
}

/*
 */

static int snd_cmipci_playback_open(struct snd_pcm_substream *substream)
{
	struct cmipci *cm = snd_pcm_substream_chip(substream);
	struct snd_pcm_runtime *runtime = substream->runtime;
	int err;

	if ((err = open_device_check(cm, CM_OPEN_PLAYBACK, substream)) < 0)
		return err;
	runtime->hw = snd_cmipci_playback;
	if (cm->chip_version == 68) {
		runtime->hw.rates |= SNDRV_PCM_RATE_88200 |
				     SNDRV_PCM_RATE_96000;
		runtime->hw.rate_max = 96000;
	}
	snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 0, 0x10000);
	cm->dig_pcm_status = cm->dig_status;
	return 0;
}

static int snd_cmipci_capture_open(struct snd_pcm_substream *substream)
{
	struct cmipci *cm = snd_pcm_substream_chip(substream);
	struct snd_pcm_runtime *runtime = substream->runtime;
	int err;

	if ((err = open_device_check(cm, CM_OPEN_CAPTURE, substream)) < 0)
		return err;
	runtime->hw = snd_cmipci_capture;
	if (cm->chip_version == 68) {	// 8768 only supports 44k/48k recording
		runtime->hw.rate_min = 41000;
		runtime->hw.rates = SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000;
	}
	snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 0, 0x10000);
	return 0;
}

static int snd_cmipci_playback2_open(struct snd_pcm_substream *substream)
{
	struct cmipci *cm = snd_pcm_substream_chip(substream);
	struct snd_pcm_runtime *runtime = substream->runtime;
	int err;

	if ((err = open_device_check(cm, CM_OPEN_PLAYBACK2, substream)) < 0) /* use channel B */
		return err;
	runtime->hw = snd_cmipci_playback2;
	mutex_lock(&cm->open_mutex);
	if (! cm->opened[CM_CH_PLAY]) {
		if (cm->can_multi_ch) {
			runtime->hw.channels_max = cm->max_channels;
			if (cm->max_channels == 4)
				snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS, &hw_constraints_channels_4);
			else if (cm->max_channels == 6)
				snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS, &hw_constraints_channels_6);
			else if (cm->max_channels == 8)
				snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS, &hw_constraints_channels_8);
		}
	}
	mutex_unlock(&cm->open_mutex);
	if (cm->chip_version == 68) {
		runtime->hw.rates |= SNDRV_PCM_RATE_88200 |
				     SNDRV_PCM_RATE_96000;
		runtime->hw.rate_max = 96000;
	}
	snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 0, 0x10000);
	return 0;
}