sound/usb/format.c - linux - Git at Google

 // 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;
 		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\n",
 			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\n",
 				 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\n",
 				 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\n",
 			 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\n",
 			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!\n");
 			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\n",
 				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\n");
 				break;
 			}

 skip_rate:
 			/* avoid endless loop */
 			if (res == 0)
 				break;
 		}
 	}

 	return nr_rates;
 }

 /* Line6 Helix series 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, 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 */
 		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)\n",
 				__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)\n",
 				__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).\n",
 				__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)\n",
 				__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\n",
 			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.\n",
 			 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\n", 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\n", 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\n",
 			 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;
 }
	// 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;
	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\n",
	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\n",
	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\n",
	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\n",
	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\n",
	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!\n");
	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\n",
	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\n");
	break;
	}

	skip_rate:
	/* avoid endless loop */
	if (res == 0)
	break;
	}
	}

	return nr_rates;
	}

	/* Line6 Helix series 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, 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 */
	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)\n",
	__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)\n",
	__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).\n",
	__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)\n",
	__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\n",
	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.\n",
	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\n", 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\n", 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\n",
	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;
	}