Orange Pi5 kernel

// 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\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 */
<------><------><------>/* Ozone Z90 USB C-Media, 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(0x0d8c, 0x0078) ||
<------><------><------>     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(0x194f, 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 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, 0x4253): /* Line6 HX-Stomp XL */
<------>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)\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;
}