// SPDX-License-Identifier: GPL-2.0-or-later

  /*

   */
  
  #include <linux/init.h>

  #include <linux/slab.h>

  #include <linux/usb.h>
  #include <linux/usb/audio.h>

  #include <linux/usb/audio-v2.h>

  #include <linux/usb/audio-v3.h>

  
  #include <sound/core.h>
  #include <sound/pcm.h>
  
  #include "usbaudio.h"
  #include "card.h"
  #include "quirks.h"
  #include "helper.h"
  #include "debug.h"

  #include "clock.h"

  #include "format.h"

  
  /*
   * parse the audio format type I descriptor
   * and returns the corresponding pcm format
   *
   * @dev: usb device
   * @fp: audioformat record
   * @format: the format tag (wFormatTag)

   * @fmt: the format type descriptor (v1/v2) or AudioStreaming descriptor (v3)

   */

  static u64 parse_audio_format_i_type(struct snd_usb_audio *chip,

  				     struct audioformat *fp,

  				     u64 format, void *_fmt)

  {

  	int sample_width, sample_bytes;

  	u64 pcm_formats = 0;

  	switch (fp->protocol) {

  	case UAC_VERSION_1:
  	default: {

  		struct uac_format_type_i_discrete_descriptor *fmt = _fmt;

  		if (format >= 64)
  			return 0; /* invalid format */

  		sample_width = fmt->bBitResolution;
  		sample_bytes = fmt->bSubframeSize;

  		format = 1ULL << format;

  		break;
  	}
  
  	case UAC_VERSION_2: {
  		struct uac_format_type_i_ext_descriptor *fmt = _fmt;
  		sample_width = fmt->bBitResolution;
  		sample_bytes = fmt->bSubslotSize;

  		if (format & UAC2_FORMAT_TYPE_I_RAW_DATA) {

  			pcm_formats |= SNDRV_PCM_FMTBIT_SPECIAL;

  			/* flag potentially raw DSD capable altsettings */
  			fp->dsd_raw = true;
  		}

  		format <<= 1;

  		break;
  	}

  	case UAC_VERSION_3: {
  		struct uac3_as_header_descriptor *as = _fmt;
  
  		sample_width = as->bBitResolution;
  		sample_bytes = as->bSubslotSize;
  
  		if (format & UAC3_FORMAT_TYPE_I_RAW_DATA)
  			pcm_formats |= SNDRV_PCM_FMTBIT_SPECIAL;
  
  		format <<= 1;
  		break;
  	}

  	}

  	fp->fmt_bits = sample_width;

  	if ((pcm_formats == 0) &&
  	    (format == 0 || format == (1 << UAC_FORMAT_TYPE_I_UNDEFINED))) {

  		/* some devices don't define this correctly... */

  		usb_audio_info(chip, "%u:%d : format type 0 is detected, processed as PCM
  ",
  			fp->iface, fp->altsetting);

  		format = 1 << UAC_FORMAT_TYPE_I_PCM;
  	}
  	if (format & (1 << UAC_FORMAT_TYPE_I_PCM)) {

  		if (((chip->usb_id == USB_ID(0x0582, 0x0016)) ||
  		     /* Edirol SD-90 */
  		     (chip->usb_id == USB_ID(0x0582, 0x000c))) &&
  		     /* Roland SC-D70 */

  		    sample_width == 24 && sample_bytes == 2)
  			sample_bytes = 3;
  		else if (sample_width > sample_bytes * 8) {

  			usb_audio_info(chip, "%u:%d : sample bitwidth %d in over sample bytes %d
  ",
  				 fp->iface, fp->altsetting,
  				 sample_width, sample_bytes);

  		}
  		/* check the format byte size */
  		switch (sample_bytes) {
  		case 1:

  			pcm_formats |= SNDRV_PCM_FMTBIT_S8;

  			break;
  		case 2:
  			if (snd_usb_is_big_endian_format(chip, fp))

  				pcm_formats |= SNDRV_PCM_FMTBIT_S16_BE; /* grrr, big endian!! */

  			else

  				pcm_formats |= SNDRV_PCM_FMTBIT_S16_LE;

  			break;
  		case 3:
  			if (snd_usb_is_big_endian_format(chip, fp))

  				pcm_formats |= SNDRV_PCM_FMTBIT_S24_3BE; /* grrr, big endian!! */

  			else

  				pcm_formats |= SNDRV_PCM_FMTBIT_S24_3LE;

  			break;
  		case 4:

  			pcm_formats |= SNDRV_PCM_FMTBIT_S32_LE;

  			break;
  		default:

  			usb_audio_info(chip,
  				 "%u:%d : unsupported sample bitwidth %d in %d bytes
  ",
  				 fp->iface, fp->altsetting,
  				 sample_width, sample_bytes);

  			break;
  		}

  	}
  	if (format & (1 << UAC_FORMAT_TYPE_I_PCM8)) {

  		/* Dallas DS4201 workaround: it advertises U8 format, but really
  		   supports S8. */
  		if (chip->usb_id == USB_ID(0x04fa, 0x4201))

  			pcm_formats |= SNDRV_PCM_FMTBIT_S8;
  		else
  			pcm_formats |= SNDRV_PCM_FMTBIT_U8;
  	}
  	if (format & (1 << UAC_FORMAT_TYPE_I_IEEE_FLOAT)) {
  		pcm_formats |= SNDRV_PCM_FMTBIT_FLOAT_LE;
  	}
  	if (format & (1 << UAC_FORMAT_TYPE_I_ALAW)) {
  		pcm_formats |= SNDRV_PCM_FMTBIT_A_LAW;
  	}
  	if (format & (1 << UAC_FORMAT_TYPE_I_MULAW)) {
  		pcm_formats |= SNDRV_PCM_FMTBIT_MU_LAW;
  	}
  	if (format & ~0x3f) {

  		usb_audio_info(chip,

  			 "%u:%d : unsupported format bits %#llx
  ",

  			 fp->iface, fp->altsetting, format);

  	}

  
  	pcm_formats |= snd_usb_interface_dsd_format_quirks(chip, fp, sample_bytes);

  	return pcm_formats;

  }

  static int set_fixed_rate(struct audioformat *fp, int rate, int rate_bits)
  {
  	kfree(fp->rate_table);
  	fp->rate_table = kmalloc(sizeof(int), GFP_KERNEL);
  	if (!fp->rate_table)
  		return -ENOMEM;
  	fp->nr_rates = 1;
  	fp->rate_min = rate;
  	fp->rate_max = rate;
  	fp->rates = rate_bits;
  	fp->rate_table[0] = rate;
  	return 0;
  }

  
  /*
   * parse the format descriptor and stores the possible sample rates
   * on the audioformat table (audio class v1).
   *
   * @dev: usb device
   * @fp: audioformat record
   * @fmt: the format descriptor
   * @offset: the start offset of descriptor pointing the rate type
   *          (7 for type I and II, 8 for type II)
   */
  static int parse_audio_format_rates_v1(struct snd_usb_audio *chip, struct audioformat *fp,
  				       unsigned char *fmt, int offset)
  {
  	int nr_rates = fmt[offset];
  
  	if (fmt[0] < offset + 1 + 3 * (nr_rates ? nr_rates : 2)) {

  		usb_audio_err(chip,
  			"%u:%d : invalid UAC_FORMAT_TYPE desc
  ",
  			fp->iface, fp->altsetting);

  		return -EINVAL;

  	}
  
  	if (nr_rates) {
  		/*
  		 * build the rate table and bitmap flags
  		 */
  		int r, idx;

  		fp->rate_table = kmalloc_array(nr_rates, sizeof(int),
  					       GFP_KERNEL);

  		if (fp->rate_table == NULL)

  			return -ENOMEM;

  
  		fp->nr_rates = 0;
  		fp->rate_min = fp->rate_max = 0;
  		for (r = 0, idx = offset + 1; r < nr_rates; r++, idx += 3) {
  			unsigned int rate = combine_triple(&fmt[idx]);
  			if (!rate)
  				continue;
  			/* C-Media CM6501 mislabels its 96 kHz altsetting */

  			/* Terratec Aureon 7.1 USB C-Media 6206, too */

  			if (rate == 48000 && nr_rates == 1 &&
  			    (chip->usb_id == USB_ID(0x0d8c, 0x0201) ||

  			     chip->usb_id == USB_ID(0x0d8c, 0x0102) ||
  			     chip->usb_id == USB_ID(0x0ccd, 0x00b1)) &&

  			    fp->altsetting == 5 && fp->maxpacksize == 392)
  				rate = 96000;

  			/* Creative VF0420/VF0470 Live Cams report 16 kHz instead of 8kHz */
  			if (rate == 16000 &&
  			    (chip->usb_id == USB_ID(0x041e, 0x4064) ||
  			     chip->usb_id == USB_ID(0x041e, 0x4068)))

  				rate = 8000;
  
  			fp->rate_table[fp->nr_rates] = rate;
  			if (!fp->rate_min || rate < fp->rate_min)
  				fp->rate_min = rate;
  			if (!fp->rate_max || rate > fp->rate_max)
  				fp->rate_max = rate;
  			fp->rates |= snd_pcm_rate_to_rate_bit(rate);
  			fp->nr_rates++;
  		}
  		if (!fp->nr_rates) {
  			hwc_debug("All rates were zero. Skipping format!
  ");

  			return -EINVAL;

  		}
  	} else {
  		/* continuous rates */
  		fp->rates = SNDRV_PCM_RATE_CONTINUOUS;
  		fp->rate_min = combine_triple(&fmt[offset + 1]);
  		fp->rate_max = combine_triple(&fmt[offset + 4]);
  	}

  
  	/* Jabra Evolve 65 headset */
  	if (chip->usb_id == USB_ID(0x0b0e, 0x030b)) {
  		/* only 48kHz for playback while keeping 16kHz for capture */
  		if (fp->nr_rates != 1)
  			return set_fixed_rate(fp, 48000, SNDRV_PCM_RATE_48000);
  	}

  	return 0;
  }

  
  /*
   * Presonus Studio 1810c supports a limited set of sampling
   * rates per altsetting but reports the full set each time.
   * If we don't filter out the unsupported rates and attempt
   * to configure the card, it will hang refusing to do any
   * further audio I/O until a hard reset is performed.
   *
   * The list of supported rates per altsetting (set of available
   * I/O channels) is described in the owner's manual, section 2.2.
   */
  static bool s1810c_valid_sample_rate(struct audioformat *fp,
  				     unsigned int rate)
  {
  	switch (fp->altsetting) {
  	case 1:
  		/* All ADAT ports available */
  		return rate <= 48000;
  	case 2:
  		/* Half of ADAT ports available */
  		return (rate == 88200 || rate == 96000);
  	case 3:
  		/* Analog I/O only (no S/PDIF nor ADAT) */
  		return rate >= 176400;
  	default:
  		return false;
  	}
  	return false;
  }

  /*

   * Many Focusrite devices supports a limited set of sampling rates per
   * altsetting. Maximum rate is exposed in the last 4 bytes of Format Type
   * descriptor which has a non-standard bLength = 10.
   */
  static bool focusrite_valid_sample_rate(struct snd_usb_audio *chip,
  					struct audioformat *fp,
  					unsigned int rate)
  {
  	struct usb_interface *iface;
  	struct usb_host_interface *alts;
  	unsigned char *fmt;
  	unsigned int max_rate;
  
  	iface = usb_ifnum_to_if(chip->dev, fp->iface);
  	if (!iface)
  		return true;
  
  	alts = &iface->altsetting[fp->altset_idx];
  	fmt = snd_usb_find_csint_desc(alts->extra, alts->extralen,
  				      NULL, UAC_FORMAT_TYPE);
  	if (!fmt)
  		return true;
  
  	if (fmt[0] == 10) { /* bLength */
  		max_rate = combine_quad(&fmt[6]);
  
  		/* Validate max rate */
  		if (max_rate != 48000 &&
  		    max_rate != 96000 &&
  		    max_rate != 192000 &&
  		    max_rate != 384000) {
  
  			usb_audio_info(chip,
  				"%u:%d : unexpected max rate: %u
  ",
  				fp->iface, fp->altsetting, max_rate);
  
  			return true;
  		}
  
  		return rate <= max_rate;
  	}
  
  	return true;
  }
  
  /*

   * Helper function to walk the array of sample rate triplets reported by
   * the device. The problem is that we need to parse whole array first to
   * get to know how many sample rates we have to expect.
   * Then fp->rate_table can be allocated and filled.
   */

  static int parse_uac2_sample_rate_range(struct snd_usb_audio *chip,
  					struct audioformat *fp, int nr_triplets,

  					const unsigned char *data)
  {
  	int i, nr_rates = 0;
  
  	fp->rates = fp->rate_min = fp->rate_max = 0;
  
  	for (i = 0; i < nr_triplets; i++) {
  		int min = combine_quad(&data[2 + 12 * i]);
  		int max = combine_quad(&data[6 + 12 * i]);
  		int res = combine_quad(&data[10 + 12 * i]);

  		unsigned int rate;

  
  		if ((max < 0) || (min < 0) || (res < 0) || (max < min))
  			continue;
  
  		/*
  		 * for ranges with res == 1, we announce a continuous sample
  		 * rate range, and this function should return 0 for no further
  		 * parsing.
  		 */
  		if (res == 1) {
  			fp->rate_min = min;
  			fp->rate_max = max;
  			fp->rates = SNDRV_PCM_RATE_CONTINUOUS;
  			return 0;
  		}
  
  		for (rate = min; rate <= max; rate += res) {

  
  			/* Filter out invalid rates on Presonus Studio 1810c */
  			if (chip->usb_id == USB_ID(0x0194f, 0x010c) &&
  			    !s1810c_valid_sample_rate(fp, rate))
  				goto skip_rate;

  			/* Filter out invalid rates on Focusrite devices */
  			if (USB_ID_VENDOR(chip->usb_id) == 0x1235 &&
  			    !focusrite_valid_sample_rate(chip, fp, rate))
  				goto skip_rate;

  			if (fp->rate_table)
  				fp->rate_table[nr_rates] = rate;
  			if (!fp->rate_min || rate < fp->rate_min)
  				fp->rate_min = rate;
  			if (!fp->rate_max || rate > fp->rate_max)
  				fp->rate_max = rate;
  			fp->rates |= snd_pcm_rate_to_rate_bit(rate);
  
  			nr_rates++;

  			if (nr_rates >= MAX_NR_RATES) {

  				usb_audio_err(chip, "invalid uac2 rates
  ");

  				break;
  			}

  skip_rate:

  			/* avoid endless loop */
  			if (res == 0)
  				break;
  		}
  	}
  
  	return nr_rates;
  }

  /* Line6 Helix series and the Rode Rodecaster Pro don't support the
   * UAC2_CS_RANGE usb function call. Return a static table of known
   * clock rates.

   */
  static int line6_parse_audio_format_rates_quirk(struct snd_usb_audio *chip,
  						struct audioformat *fp)
  {
  	switch (chip->usb_id) {

  	case USB_ID(0x0e41, 0x4241): /* Line6 Helix */
  	case USB_ID(0x0e41, 0x4242): /* Line6 Helix Rack */
  	case USB_ID(0x0e41, 0x4244): /* Line6 Helix LT */
  	case USB_ID(0x0e41, 0x4246): /* Line6 HX-Stomp */

  	case USB_ID(0x0e41, 0x4247): /* Line6 Pod Go */

  	case USB_ID(0x0e41, 0x4248): /* Line6 Helix >= fw 2.82 */
  	case USB_ID(0x0e41, 0x4249): /* Line6 Helix Rack >= fw 2.82 */
  	case USB_ID(0x0e41, 0x424a): /* Line6 Helix LT >= fw 2.82 */

  	case USB_ID(0x19f7, 0x0011): /* Rode Rodecaster Pro */

  		return set_fixed_rate(fp, 48000, SNDRV_PCM_RATE_48000);

  	}
  
  	return -ENODEV;
  }

  /*

   * parse the format descriptor and stores the possible sample rates

   * on the audioformat table (audio class v2 and v3).

   */

  static int parse_audio_format_rates_v2v3(struct snd_usb_audio *chip,

  				       struct audioformat *fp)

  {
  	struct usb_device *dev = chip->dev;
  	unsigned char tmp[2], *data;

  	int nr_triplets, data_size, ret = 0, ret_l6;

  	int clock = snd_usb_clock_find_source(chip, fp, false);

  	if (clock < 0) {

  		dev_err(&dev->dev,
  			"%s(): unable to find clock source (clock %d)
  ",

  				__func__, clock);
  		goto err;
  	}

  	/* get the number of sample rates first by only fetching 2 bytes */
  	ret = snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), UAC2_CS_RANGE,
  			      USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_IN,

  			      UAC2_CS_CONTROL_SAM_FREQ << 8,
  			      snd_usb_ctrl_intf(chip) | (clock << 8),

  			      tmp, sizeof(tmp));

  
  	if (ret < 0) {

  		/* line6 helix devices don't support UAC2_CS_CONTROL_SAM_FREQ call */
  		ret_l6 = line6_parse_audio_format_rates_quirk(chip, fp);
  		if (ret_l6 == -ENODEV) {
  			/* no line6 device found continue showing the error */
  			dev_err(&dev->dev,
  				"%s(): unable to retrieve number of sample rates (clock %d)
  ",
  				__func__, clock);
  			goto err;
  		}
  		if (ret_l6 == 0) {
  			dev_info(&dev->dev,
  				"%s(): unable to retrieve number of sample rates: set it to a predefined value (clock %d).
  ",

  				__func__, clock);

  			return 0;
  		}
  		ret = ret_l6;

  		goto err;
  	}

  	nr_triplets = (tmp[1] << 8) | tmp[0];
  	data_size = 2 + 12 * nr_triplets;

  	data = kzalloc(data_size, GFP_KERNEL);
  	if (!data) {
  		ret = -ENOMEM;
  		goto err;
  	}
  
  	/* now get the full information */
  	ret = snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), UAC2_CS_RANGE,

  			      USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_IN,

  			      UAC2_CS_CONTROL_SAM_FREQ << 8,
  			      snd_usb_ctrl_intf(chip) | (clock << 8),

  			      data, data_size);

  
  	if (ret < 0) {

  		dev_err(&dev->dev,
  			"%s(): unable to retrieve sample rate range (clock %d)
  ",

  				__func__, clock);

  		ret = -EINVAL;
  		goto err_free;
  	}

  	/* Call the triplet parser, and make sure fp->rate_table is NULL.
  	 * We just use the return value to know how many sample rates we
  	 * will have to deal with. */
  	kfree(fp->rate_table);
  	fp->rate_table = NULL;

  	fp->nr_rates = parse_uac2_sample_rate_range(chip, fp, nr_triplets, data);

  
  	if (fp->nr_rates == 0) {
  		/* SNDRV_PCM_RATE_CONTINUOUS */
  		ret = 0;
  		goto err_free;
  	}

  	fp->rate_table = kmalloc_array(fp->nr_rates, sizeof(int), GFP_KERNEL);

  	if (!fp->rate_table) {
  		ret = -ENOMEM;
  		goto err_free;
  	}

  	/* Call the triplet parser again, but this time, fp->rate_table is
  	 * allocated, so the rates will be stored */

  	parse_uac2_sample_rate_range(chip, fp, nr_triplets, data);

  
  err_free:
  	kfree(data);
  err:
  	return ret;
  }
  
  /*
   * parse the format type I and III descriptors
   */
  static int parse_audio_format_i(struct snd_usb_audio *chip,

  				struct audioformat *fp, u64 format,
  				void *_fmt)

  {

  	snd_pcm_format_t pcm_format;

  	unsigned int fmt_type;

  	int ret;

  	switch (fp->protocol) {
  	default:
  	case UAC_VERSION_1:
  	case UAC_VERSION_2: {
  		struct uac_format_type_i_continuous_descriptor *fmt = _fmt;
  
  		fmt_type = fmt->bFormatType;
  		break;
  	}
  	case UAC_VERSION_3: {
  		/* fp->fmt_type is already set in this case */
  		fmt_type = fp->fmt_type;
  		break;
  	}
  	}
  
  	if (fmt_type == UAC_FORMAT_TYPE_III) {

  		/* FIXME: the format type is really IECxxx
  		 *        but we give normal PCM format to get the existing
  		 *        apps working...
  		 */
  		switch (chip->usb_id) {
  
  		case USB_ID(0x0763, 0x2003): /* M-Audio Audiophile USB */
  			if (chip->setup == 0x00 && 
  			    fp->altsetting == 6)
  				pcm_format = SNDRV_PCM_FORMAT_S16_BE;
  			else
  				pcm_format = SNDRV_PCM_FORMAT_S16_LE;
  			break;
  		default:
  			pcm_format = SNDRV_PCM_FORMAT_S16_LE;
  		}

  		fp->formats = pcm_format_to_bits(pcm_format);

  	} else {

  		fp->formats = parse_audio_format_i_type(chip, fp, format, _fmt);

  		if (!fp->formats)

  			return -EINVAL;

  	}

  	/* gather possible sample rates */
  	/* audio class v1 reports possible sample rates as part of the
  	 * proprietary class specific descriptor.
  	 * audio class v2 uses class specific EP0 range requests for that.
  	 */

  	switch (fp->protocol) {

  	default:

  	case UAC_VERSION_1: {
  		struct uac_format_type_i_continuous_descriptor *fmt = _fmt;

  		fp->channels = fmt->bNrChannels;

  		ret = parse_audio_format_rates_v1(chip, fp, (unsigned char *) fmt, 7);

  		break;

  	}

  	case UAC_VERSION_2:

  	case UAC_VERSION_3: {

  		/* fp->channels is already set in this case */

  		ret = parse_audio_format_rates_v2v3(chip, fp);

  		break;
  	}

  	}

  
  	if (fp->channels < 1) {

  		usb_audio_err(chip,
  			"%u:%d : invalid channels %d
  ",
  			fp->iface, fp->altsetting, fp->channels);

  		return -EINVAL;

  	}
  
  	return ret;
  }
  
  /*
   * parse the format type II descriptor
   */
  static int parse_audio_format_ii(struct snd_usb_audio *chip,
  				 struct audioformat *fp,

  				 u64 format, void *_fmt)

  {
  	int brate, framesize, ret;

  
  	switch (format) {
  	case UAC_FORMAT_TYPE_II_AC3:
  		/* FIXME: there is no AC3 format defined yet */

  		// fp->formats = SNDRV_PCM_FMTBIT_AC3;
  		fp->formats = SNDRV_PCM_FMTBIT_U8; /* temporary hack to receive byte streams */

  		break;
  	case UAC_FORMAT_TYPE_II_MPEG:

  		fp->formats = SNDRV_PCM_FMTBIT_MPEG;

  		break;
  	default:

  		usb_audio_info(chip,

  			 "%u:%d : unknown format tag %#llx is detected.  processed as MPEG.
  ",

  			 fp->iface, fp->altsetting, format);

  		fp->formats = SNDRV_PCM_FMTBIT_MPEG;

  		break;
  	}
  
  	fp->channels = 1;

  	switch (fp->protocol) {

  	default:

  	case UAC_VERSION_1: {
  		struct uac_format_type_ii_discrete_descriptor *fmt = _fmt;
  		brate = le16_to_cpu(fmt->wMaxBitRate);
  		framesize = le16_to_cpu(fmt->wSamplesPerFrame);

  		usb_audio_info(chip, "found format II with max.bitrate = %d, frame size=%d
  ", brate, framesize);

  		fp->frame_size = framesize;
  		ret = parse_audio_format_rates_v1(chip, fp, _fmt, 8); /* fmt[8..] sample rates */
  		break;
  	}
  	case UAC_VERSION_2: {
  		struct uac_format_type_ii_ext_descriptor *fmt = _fmt;
  		brate = le16_to_cpu(fmt->wMaxBitRate);
  		framesize = le16_to_cpu(fmt->wSamplesPerFrame);

  		usb_audio_info(chip, "found format II with max.bitrate = %d, frame size=%d
  ", brate, framesize);

  		fp->frame_size = framesize;

  		ret = parse_audio_format_rates_v2v3(chip, fp);

  		break;
  	}
  	}
  
  	return ret;
  }

  int snd_usb_parse_audio_format(struct snd_usb_audio *chip,

  			       struct audioformat *fp, u64 format,

  			       struct uac_format_type_i_continuous_descriptor *fmt,

  			       int stream)

  {
  	int err;

  	switch (fmt->bFormatType) {

  	case UAC_FORMAT_TYPE_I:
  	case UAC_FORMAT_TYPE_III:

  		err = parse_audio_format_i(chip, fp, format, fmt);

  		break;
  	case UAC_FORMAT_TYPE_II:

  		err = parse_audio_format_ii(chip, fp, format, fmt);

  		break;
  	default:

  		usb_audio_info(chip,
  			 "%u:%d : format type %d is not supported yet
  ",
  			 fp->iface, fp->altsetting,
  			 fmt->bFormatType);

  		return -ENOTSUPP;

  	}

  	fp->fmt_type = fmt->bFormatType;

  	if (err < 0)
  		return err;
  #if 1
  	/* FIXME: temporary hack for extigy/audigy 2 nx/zs */
  	/* extigy apparently supports sample rates other than 48k
  	 * but not in ordinary way.  so we enable only 48k atm.
  	 */
  	if (chip->usb_id == USB_ID(0x041e, 0x3000) ||
  	    chip->usb_id == USB_ID(0x041e, 0x3020) ||
  	    chip->usb_id == USB_ID(0x041e, 0x3061)) {

  		if (fmt->bFormatType == UAC_FORMAT_TYPE_I &&

  		    fp->rates != SNDRV_PCM_RATE_48000 &&
  		    fp->rates != SNDRV_PCM_RATE_96000)

  			return -ENOTSUPP;

  	}
  #endif
  	return 0;
  }

  int snd_usb_parse_audio_format_v3(struct snd_usb_audio *chip,
  			       struct audioformat *fp,
  			       struct uac3_as_header_descriptor *as,
  			       int stream)
  {
  	u64 format = le64_to_cpu(as->bmFormats);
  	int err;
  
  	/*
  	 * Type I format bits are D0..D6
  	 * This test works because type IV is not supported
  	 */
  	if (format & 0x7f)
  		fp->fmt_type = UAC_FORMAT_TYPE_I;
  	else
  		fp->fmt_type = UAC_FORMAT_TYPE_III;
  
  	err = parse_audio_format_i(chip, fp, format, as);
  	if (err < 0)
  		return err;
  
  	return 0;
  }