hda_codec.c

底层驱动开发

	{
		.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
		.name = SNDRV_CTL_NAME_IEC958("",PLAYBACK,SWITCH),
		.info = snd_hda_spdif_out_switch_info,
		.get = snd_hda_spdif_out_switch_get,
		.put = snd_hda_spdif_out_switch_put,
	},
	{ } /* end */
};

/**
 * snd_hda_create_spdif_out_ctls - create Output SPDIF-related controls
 * @codec: the HDA codec
 * @nid: audio out widget NID
 *
 * Creates controls related with the SPDIF output.
 * Called from each patch supporting the SPDIF out.
 *
 * Returns 0 if successful, or a negative error code.
 */
int snd_hda_create_spdif_out_ctls(struct hda_codec *codec, hda_nid_t nid)
{
	int err;
	snd_kcontrol_t *kctl;
	snd_kcontrol_new_t *dig_mix;

	for (dig_mix = dig_mixes; dig_mix->name; dig_mix++) {
		kctl = snd_ctl_new1(dig_mix, codec);
		kctl->private_value = nid;
		if ((err = snd_ctl_add(codec->bus->card, kctl)) < 0)
			return err;
	}
	codec->spdif_ctls = snd_hda_codec_read(codec, nid, 0, AC_VERB_GET_DIGI_CONVERT, 0);
	codec->spdif_status = convert_to_spdif_status(codec->spdif_ctls);
	return 0;
}

/*
 * SPDIF input
 */

#define snd_hda_spdif_in_switch_info	snd_hda_spdif_out_switch_info

static int snd_hda_spdif_in_switch_get(snd_kcontrol_t *kcontrol, snd_ctl_elem_value_t *ucontrol)
{
	struct hda_codec *codec = snd_kcontrol_chip(kcontrol);

	ucontrol->value.integer.value[0] = codec->spdif_in_enable;
	return 0;
}

static int snd_hda_spdif_in_switch_put(snd_kcontrol_t *kcontrol, snd_ctl_elem_value_t *ucontrol)
{
	struct hda_codec *codec = snd_kcontrol_chip(kcontrol);
	hda_nid_t nid = kcontrol->private_value;
	unsigned int val = !!ucontrol->value.integer.value[0];
	int change;

	down(&codec->spdif_mutex);
	change = codec->spdif_in_enable != val;
	if (change || codec->in_resume) {
		codec->spdif_in_enable = val;
		snd_hda_codec_write(codec, nid, 0, AC_VERB_SET_DIGI_CONVERT_1, val);
	}
	up(&codec->spdif_mutex);
	return change;
}

static int snd_hda_spdif_in_status_get(snd_kcontrol_t *kcontrol, snd_ctl_elem_value_t *ucontrol)
{
	struct hda_codec *codec = snd_kcontrol_chip(kcontrol);
	hda_nid_t nid = kcontrol->private_value;
	unsigned short val;
	unsigned int sbits;

	val = snd_hda_codec_read(codec, nid, 0, AC_VERB_GET_DIGI_CONVERT, 0);
	sbits = convert_to_spdif_status(val);
	ucontrol->value.iec958.status[0] = sbits;
	ucontrol->value.iec958.status[1] = sbits >> 8;
	ucontrol->value.iec958.status[2] = sbits >> 16;
	ucontrol->value.iec958.status[3] = sbits >> 24;
	return 0;
}

static snd_kcontrol_new_t dig_in_ctls[] = {
	{
		.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
		.name = SNDRV_CTL_NAME_IEC958("",CAPTURE,SWITCH),
		.info = snd_hda_spdif_in_switch_info,
		.get = snd_hda_spdif_in_switch_get,
		.put = snd_hda_spdif_in_switch_put,
	},
	{
		.access = SNDRV_CTL_ELEM_ACCESS_READ,
		.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
		.name = SNDRV_CTL_NAME_IEC958("",CAPTURE,DEFAULT),
		.info = snd_hda_spdif_mask_info,
		.get = snd_hda_spdif_in_status_get,
	},
	{ } /* end */
};

/**
 * snd_hda_create_spdif_in_ctls - create Input SPDIF-related controls
 * @codec: the HDA codec
 * @nid: audio in widget NID
 *
 * Creates controls related with the SPDIF input.
 * Called from each patch supporting the SPDIF in.
 *
 * Returns 0 if successful, or a negative error code.
 */
int snd_hda_create_spdif_in_ctls(struct hda_codec *codec, hda_nid_t nid)
{
	int err;
	snd_kcontrol_t *kctl;
	snd_kcontrol_new_t *dig_mix;

	for (dig_mix = dig_in_ctls; dig_mix->name; dig_mix++) {
		kctl = snd_ctl_new1(dig_mix, codec);
		kctl->private_value = nid;
		if ((err = snd_ctl_add(codec->bus->card, kctl)) < 0)
			return err;
	}
	codec->spdif_in_enable = snd_hda_codec_read(codec, nid, 0, AC_VERB_GET_DIGI_CONVERT, 0) & 1;
	return 0;
}


/**
 * snd_hda_build_controls - build mixer controls
 * @bus: the BUS
 *
 * Creates mixer controls for each codec included in the bus.
 *
 * Returns 0 if successful, otherwise a negative error code.
 */
int snd_hda_build_controls(struct hda_bus *bus)
{
	struct list_head *p;

	/* build controls */
	list_for_each(p, &bus->codec_list) {
		struct hda_codec *codec = list_entry(p, struct hda_codec, list);
		int err;
		if (! codec->patch_ops.build_controls)
			continue;
		err = codec->patch_ops.build_controls(codec);
		if (err < 0)
			return err;
	}

	/* initialize */
	list_for_each(p, &bus->codec_list) {
		struct hda_codec *codec = list_entry(p, struct hda_codec, list);
		int err;
		if (! codec->patch_ops.init)
			continue;
		err = codec->patch_ops.init(codec);
		if (err < 0)
			return err;
	}
	return 0;
}


/*
 * stream formats
 */
struct hda_rate_tbl {
	unsigned int hz;
	unsigned int alsa_bits;
	unsigned int hda_fmt;
};

static struct hda_rate_tbl rate_bits[] = {
	/* rate in Hz, ALSA rate bitmask, HDA format value */

	/* autodetected value used in snd_hda_query_supported_pcm */
	{ 8000, SNDRV_PCM_RATE_8000, 0x0500 }, /* 1/6 x 48 */
	{ 11025, SNDRV_PCM_RATE_11025, 0x4300 }, /* 1/4 x 44 */
	{ 16000, SNDRV_PCM_RATE_16000, 0x0200 }, /* 1/3 x 48 */
	{ 22050, SNDRV_PCM_RATE_22050, 0x4100 }, /* 1/2 x 44 */
	{ 32000, SNDRV_PCM_RATE_32000, 0x0a00 }, /* 2/3 x 48 */
	{ 44100, SNDRV_PCM_RATE_44100, 0x4000 }, /* 44 */
	{ 48000, SNDRV_PCM_RATE_48000, 0x0000 }, /* 48 */
	{ 88200, SNDRV_PCM_RATE_88200, 0x4800 }, /* 2 x 44 */
	{ 96000, SNDRV_PCM_RATE_96000, 0x0800 }, /* 2 x 48 */
	{ 176400, SNDRV_PCM_RATE_176400, 0x5800 },/* 4 x 44 */
	{ 192000, SNDRV_PCM_RATE_192000, 0x1800 }, /* 4 x 48 */

	/* not autodetected value */
	{ 9600, SNDRV_PCM_RATE_KNOT, 0x0400 }, /* 1/5 x 48 */

	{ 0 } /* terminator */
};

/**
 * snd_hda_calc_stream_format - calculate format bitset
 * @rate: the sample rate
 * @channels: the number of channels
 * @format: the PCM format (SNDRV_PCM_FORMAT_XXX)
 * @maxbps: the max. bps
 *
 * Calculate the format bitset from the given rate, channels and th PCM format.
 *
 * Return zero if invalid.
 */
unsigned int snd_hda_calc_stream_format(unsigned int rate,
					unsigned int channels,
					unsigned int format,
					unsigned int maxbps)
{
	int i;
	unsigned int val = 0;

	for (i = 0; rate_bits[i].hz; i++)
		if (rate_bits[i].hz == rate) {
			val = rate_bits[i].hda_fmt;
			break;
		}
	if (! rate_bits[i].hz) {
		snd_printdd("invalid rate %d\n", rate);
		return 0;
	}

	if (channels == 0 || channels > 8) {
		snd_printdd("invalid channels %d\n", channels);
		return 0;
	}
	val |= channels - 1;

	switch (snd_pcm_format_width(format)) {
	case 8:  val |= 0x00; break;
	case 16: val |= 0x10; break;
	case 20:
	case 24:
	case 32:
		if (maxbps >= 32)
			val |= 0x40;
		else if (maxbps >= 24)
			val |= 0x30;
		else
			val |= 0x20;
		break;
	default:
		snd_printdd("invalid format width %d\n", snd_pcm_format_width(format));
		return 0;
	}

	return val;
}

/**
 * snd_hda_query_supported_pcm - query the supported PCM rates and formats
 * @codec: the HDA codec
 * @nid: NID to query
 * @ratesp: the pointer to store the detected rate bitflags
 * @formatsp: the pointer to store the detected formats
 * @bpsp: the pointer to store the detected format widths
 *
 * Queries the supported PCM rates and formats.  The NULL @ratesp, @formatsp
 * or @bsps argument is ignored.
 *
 * Returns 0 if successful, otherwise a negative error code.
 */
int snd_hda_query_supported_pcm(struct hda_codec *codec, hda_nid_t nid,
				u32 *ratesp, u64 *formatsp, unsigned int *bpsp)
{
	int i;
	unsigned int val, streams;

	val = 0;
	if (nid != codec->afg &&
	    snd_hda_param_read(codec, nid, AC_PAR_AUDIO_WIDGET_CAP) & AC_WCAP_FORMAT_OVRD) {
		val = snd_hda_param_read(codec, nid, AC_PAR_PCM);
		if (val == -1)
			return -EIO;
	}
	if (! val)
		val = snd_hda_param_read(codec, codec->afg, AC_PAR_PCM);

	if (ratesp) {
		u32 rates = 0;
		for (i = 0; rate_bits[i].hz; i++) {
			if (val & (1 << i))
				rates |= rate_bits[i].alsa_bits;
		}
		*ratesp = rates;
	}

	if (formatsp || bpsp) {
		u64 formats = 0;
		unsigned int bps;
		unsigned int wcaps;

		wcaps = snd_hda_param_read(codec, nid, AC_PAR_AUDIO_WIDGET_CAP);
		streams = snd_hda_param_read(codec, nid, AC_PAR_STREAM);
		if (streams == -1)
			return -EIO;
		if (! streams) {
			streams = snd_hda_param_read(codec, codec->afg, AC_PAR_STREAM);
			if (streams == -1)
				return -EIO;
		}

		bps = 0;
		if (streams & AC_SUPFMT_PCM) {
			if (val & AC_SUPPCM_BITS_8) {
				formats |= SNDRV_PCM_FMTBIT_U8;
				bps = 8;
			}
			if (val & AC_SUPPCM_BITS_16) {
				formats |= SNDRV_PCM_FMTBIT_S16_LE;
				bps = 16;
			}
			if (wcaps & AC_WCAP_DIGITAL) {
				if (val & AC_SUPPCM_BITS_32)
					formats |= SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE;
				if (val & (AC_SUPPCM_BITS_20|AC_SUPPCM_BITS_24))
					formats |= SNDRV_PCM_FMTBIT_S32_LE;
				if (val & AC_SUPPCM_BITS_24)
					bps = 24;
				else if (val & AC_SUPPCM_BITS_20)
					bps = 20;
			} else if (val & (AC_SUPPCM_BITS_20|AC_SUPPCM_BITS_24|AC_SUPPCM_BITS_32)) {
				formats |= SNDRV_PCM_FMTBIT_S32_LE;
				if (val & AC_SUPPCM_BITS_32)
					bps = 32;
				else if (val & AC_SUPPCM_BITS_20)
					bps = 20;
				else if (val & AC_SUPPCM_BITS_24)
					bps = 24;
			}
		}
		else if (streams == AC_SUPFMT_FLOAT32) { /* should be exclusive */
			formats |= SNDRV_PCM_FMTBIT_FLOAT_LE;
			bps = 32;
		} else if (streams == AC_SUPFMT_AC3) { /* should be exclusive */
			/* temporary hack: we have still no proper support
			 * for the direct AC3 stream...
			 */
			formats |= SNDRV_PCM_FMTBIT_U8;
			bps = 8;
		}
		if (formatsp)
			*formatsp = formats;
		if (bpsp)
			*bpsp = bps;
	}

	return 0;
}

/**
 * snd_hda_is_supported_format - check whether the given node supports the format val
 *
 * Returns 1 if supported, 0 if not.
 */
int snd_hda_is_supported_format(struct hda_codec *codec, hda_nid_t nid,
				unsigned int format)
{
	int i;
	unsigned int val = 0, rate, stream;

	if (nid != codec->afg &&
	    snd_hda_param_read(codec, nid, AC_PAR_AUDIO_WIDGET_CAP) & AC_WCAP_FORMAT_OVRD) {
		val = snd_hda_param_read(codec, nid, AC_PAR_PCM);
		if (val == -1)
			return 0;
	}
	if (! val) {
		val = snd_hda_param_read(codec, codec->afg, AC_PAR_PCM);
		if (val == -1)
			return 0;
	}

	rate = format & 0xff00;
	for (i = 0; rate_bits[i].hz; i++)
		if (rate_bits[i].hda_fmt == rate) {
			if (val & (1 << i))
				break;
			return 0;
		}
	if (! rate_bits[i].hz)
		return 0;

	stream = snd_hda_param_read(codec, nid, AC_PAR_STREAM);
	if (stream == -1)
		return 0;
	if (! stream && nid != codec->afg)
		stream = snd_hda_param_read(codec, codec->afg, AC_PAR_STREAM);
	if (! stream || stream == -1)
		return 0;

	if (stream & AC_SUPFMT_PCM) {
		switch (format & 0xf0) {
		case 0x00:
			if (! (val & AC_SUPPCM_BITS_8))
				return 0;
			break;
		case 0x10:
			if (! (val & AC_SUPPCM_BITS_16))
				return 0;
			break;
		case 0x20:
			if (! (val & AC_SUPPCM_BITS_20))
				return 0;
			break;
		case 0x30:
			if (! (val & AC_SUPPCM_BITS_24))
				return 0;
			break;
		case 0x40:
			if (! (val & AC_SUPPCM_BITS_32))
				return 0;
			break;
		default:
			return 0;
		}
	} else {
		/* FIXME: check for float32 and AC3? */
	}

	return 1;
}

/*
 * PCM stuff
 */
static int hda_pcm_default_open_close(struct hda_pcm_stream *hinfo,
				      struct hda_codec *codec,
				      snd_pcm_substream_t *substream)
{
	return 0;
}

static int hda_pcm_default_prepare(struct hda_pcm_stream *hinfo,
				   struct hda_codec *codec,
				   unsigned int stream_tag,
				   unsigned int format,
				   snd_pcm_substream_t *substream)
{
	snd_hda_codec_setup_stream(codec, hinfo->nid, stream_tag, 0, format);
	return 0;
}

static int hda_pcm_default_cleanup(struct hda_pcm_stream *hinfo,
				   struct hda_codec *codec,
				   snd_pcm_substream_t *substream)
{
	snd_hda_codec_setup_stream(codec, hinfo->nid, 0, 0, 0);
	return 0;
}

static int set_pcm_default_values(struct hda_codec *codec, struct hda_pcm_stream *info)
{
	if (info->nid) {
		/* query support PCM information from the given NID */
		if (! info->rates || ! info->formats)
			snd_hda_query_supported_pcm(codec, info->nid,
						    info->rates ? NULL : &info->rates,
						    info->formats ? NULL : &info->formats,
						    info->maxbps ? NULL : &info->maxbps);
	}
	if (info->ops.open == NULL)
		info->ops.open = hda_pcm_default_open_close;
	if (info->ops.close == NULL)
		info->ops.close = hda_pcm_default_open_close;
	if (info->ops.prepare == NULL) {
		snd_assert(info->nid, return -EINVAL);
		info->ops.prepare = hda_pcm_default_prepare;
	}
	if (info->ops.cleanup == NULL) {
		snd_assert(info->nid, return -EINVAL);
		info->ops.cleanup = hda_pcm_default_cleanup;
	}
	return 0;
}

/**
 * snd_hda_build_pcms - build PCM information
 * @bus: the BUS
 *
 * Create PCM information for each codec included in the bus.
 *
 * The build_pcms codec patch is requested to set up codec->num_pcms and
 * codec->pcm_info properly.  The array is referred by the top-level driver
 * to create its PCM instances.
 * The allocated codec->pcm_info should be released in codec->patch_ops.free
 * callback.
 *
 * At least, substreams, channels_min and channels_max must be filled for
 * each stream.  substreams = 0 indicates that the stream doesn't exist.
 * When rates and/or formats are zero, the supported values are queried
 * from the given nid.  The nid is used also by the default ops.prepare
 * and ops.cleanup callbacks.
 *