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// SPDX-License-Identifier: GPL-2.0-or-later
//
// Special handling for implicit feedback mode
//
#include <linux/init.h>
#include <linux/usb.h>
#include <linux/usb/audio.h>
#include <linux/usb/audio-v2.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include "usbaudio.h"
#include "card.h"
#include "helper.h"
#include "pcm.h"
#include "implicit.h"
enum {
IMPLICIT_FB_NONE,
IMPLICIT_FB_GENERIC,
IMPLICIT_FB_FIXED,
IMPLICIT_FB_BOTH, /* generic playback + capture (for BOSS) */
};
struct snd_usb_implicit_fb_match {
unsigned int id;
unsigned int iface_class;
unsigned int ep_num;
unsigned int iface;
int type;
};
#define IMPLICIT_FB_GENERIC_DEV(vend, prod) \
{ .id = USB_ID(vend, prod), .type = IMPLICIT_FB_GENERIC }
#define IMPLICIT_FB_FIXED_DEV(vend, prod, ep, ifnum) \
{ .id = USB_ID(vend, prod), .type = IMPLICIT_FB_FIXED, .ep_num = (ep),\
.iface = (ifnum) }
#define IMPLICIT_FB_BOTH_DEV(vend, prod, ep, ifnum) \
{ .id = USB_ID(vend, prod), .type = IMPLICIT_FB_BOTH, .ep_num = (ep),\
.iface = (ifnum) }
#define IMPLICIT_FB_SKIP_DEV(vend, prod) \
{ .id = USB_ID(vend, prod), .type = IMPLICIT_FB_NONE }
/* Implicit feedback quirk table for playback */
static const struct snd_usb_implicit_fb_match playback_implicit_fb_quirks[] = {
/* Fixed EP */
/* FIXME: check the availability of generic matching */
IMPLICIT_FB_FIXED_DEV(0x0763, 0x2030, 0x81, 3), /* M-Audio Fast Track C400 */
IMPLICIT_FB_FIXED_DEV(0x0763, 0x2031, 0x81, 3), /* M-Audio Fast Track C600 */
IMPLICIT_FB_FIXED_DEV(0x0763, 0x2080, 0x81, 2), /* M-Audio FastTrack Ultra */
IMPLICIT_FB_FIXED_DEV(0x0763, 0x2081, 0x81, 2), /* M-Audio FastTrack Ultra */
IMPLICIT_FB_FIXED_DEV(0x2466, 0x8010, 0x81, 2), /* Fractal Audio Axe-Fx III */
IMPLICIT_FB_FIXED_DEV(0x31e9, 0x0001, 0x81, 2), /* Solid State Logic SSL2 */
IMPLICIT_FB_FIXED_DEV(0x31e9, 0x0002, 0x81, 2), /* Solid State Logic SSL2+ */
IMPLICIT_FB_FIXED_DEV(0x0499, 0x172f, 0x81, 2), /* Steinberg UR22C */
IMPLICIT_FB_FIXED_DEV(0x0d9a, 0x00df, 0x81, 2), /* RTX6001 */
IMPLICIT_FB_FIXED_DEV(0x22f0, 0x0006, 0x81, 3), /* Allen&Heath Qu-16 */
IMPLICIT_FB_FIXED_DEV(0x1686, 0xf029, 0x82, 2), /* Zoom UAC-2 */
IMPLICIT_FB_FIXED_DEV(0x2466, 0x8003, 0x86, 2), /* Fractal Audio Axe-Fx II */
IMPLICIT_FB_FIXED_DEV(0x0499, 0x172a, 0x86, 2), /* Yamaha MODX */
/* Special matching */
{ .id = USB_ID(0x07fd, 0x0004), .iface_class = USB_CLASS_AUDIO,
.type = IMPLICIT_FB_NONE }, /* MicroBook IIc */
/* ep = 0x84, ifnum = 0 */
{ .id = USB_ID(0x07fd, 0x0004), .iface_class = USB_CLASS_VENDOR_SPEC,
.type = IMPLICIT_FB_FIXED,
.ep_num = 0x84, .iface = 0 }, /* MOTU MicroBook II */
{} /* terminator */
};
/* Implicit feedback quirk table for capture: only FIXED type */
static const struct snd_usb_implicit_fb_match capture_implicit_fb_quirks[] = {
{} /* terminator */
};
/* set up sync EP information on the audioformat */
static int add_implicit_fb_sync_ep(struct snd_usb_audio *chip,
struct audioformat *fmt,
int ep, int ep_idx, int ifnum,
const struct usb_host_interface *alts)
{
struct usb_interface *iface;
if (!alts) {
iface = usb_ifnum_to_if(chip->dev, ifnum);
if (!iface || iface->num_altsetting < 2)
return 0;
alts = &iface->altsetting[1];
}
fmt->sync_ep = ep;
fmt->sync_iface = ifnum;
fmt->sync_altsetting = alts->desc.bAlternateSetting;
fmt->sync_ep_idx = ep_idx;
fmt->implicit_fb = 1;
usb_audio_dbg(chip,
"%d:%d: added %s implicit_fb sync_ep %x, iface %d:%d\n",
fmt->iface, fmt->altsetting,
(ep & USB_DIR_IN) ? "playback" : "capture",
fmt->sync_ep, fmt->sync_iface, fmt->sync_altsetting);
return 1;
}
/* Check whether the given UAC2 iface:altset points to an implicit fb source */
static int add_generic_uac2_implicit_fb(struct snd_usb_audio *chip,
struct audioformat *fmt,
unsigned int ifnum,
unsigned int altsetting)
{
struct usb_host_interface *alts;
struct usb_endpoint_descriptor *epd;
alts = snd_usb_get_host_interface(chip, ifnum, altsetting);
if (!alts)
return 0;
if (alts->desc.bInterfaceClass != USB_CLASS_AUDIO ||
alts->desc.bInterfaceSubClass != USB_SUBCLASS_AUDIOSTREAMING ||
alts->desc.bInterfaceProtocol != UAC_VERSION_2 ||
alts->desc.bNumEndpoints < 1)
return 0;
epd = get_endpoint(alts, 0);
if (!usb_endpoint_is_isoc_in(epd) ||
(epd->bmAttributes & USB_ENDPOINT_USAGE_MASK) !=
USB_ENDPOINT_USAGE_IMPLICIT_FB)
return 0;
return add_implicit_fb_sync_ep(chip, fmt, epd->bEndpointAddress, 0,
ifnum, alts);
}
static bool roland_sanity_check_iface(struct usb_host_interface *alts)
{
if (alts->desc.bInterfaceClass != USB_CLASS_VENDOR_SPEC ||
(alts->desc.bInterfaceSubClass != 2 &&
alts->desc.bInterfaceProtocol != 2) ||
alts->desc.bNumEndpoints < 1)
return false;
return true;
}
/* Like the UAC2 case above, but specific to Roland with vendor class and hack */
static int add_roland_implicit_fb(struct snd_usb_audio *chip,
struct audioformat *fmt,
struct usb_host_interface *alts)
{
struct usb_endpoint_descriptor *epd;
if (!roland_sanity_check_iface(alts))
return 0;
/* only when both streams are with ASYNC type */
epd = get_endpoint(alts, 0);
if (!usb_endpoint_is_isoc_out(epd) ||
(epd->bmAttributes & USB_ENDPOINT_SYNCTYPE) != USB_ENDPOINT_SYNC_ASYNC)
return 0;
/* check capture EP */
alts = snd_usb_get_host_interface(chip,
alts->desc.bInterfaceNumber + 1,
alts->desc.bAlternateSetting);
if (!alts || !roland_sanity_check_iface(alts))
return 0;
epd = get_endpoint(alts, 0);
if (!usb_endpoint_is_isoc_in(epd) ||
(epd->bmAttributes & USB_ENDPOINT_SYNCTYPE) != USB_ENDPOINT_SYNC_ASYNC)
return 0;
chip->quirk_flags |= QUIRK_FLAG_PLAYBACK_FIRST;
return add_implicit_fb_sync_ep(chip, fmt, epd->bEndpointAddress, 0,
alts->desc.bInterfaceNumber, alts);
}
/* capture quirk for Roland device; always full-duplex */
static int add_roland_capture_quirk(struct snd_usb_audio *chip,
struct audioformat *fmt,
struct usb_host_interface *alts)
{
struct usb_endpoint_descriptor *epd;
if (!roland_sanity_check_iface(alts))
return 0;
epd = get_endpoint(alts, 0);
if (!usb_endpoint_is_isoc_in(epd) ||
(epd->bmAttributes & USB_ENDPOINT_SYNCTYPE) != USB_ENDPOINT_SYNC_ASYNC)
return 0;
alts = snd_usb_get_host_interface(chip,
alts->desc.bInterfaceNumber - 1,
alts->desc.bAlternateSetting);
if (!alts || !roland_sanity_check_iface(alts))
return 0;
epd = get_endpoint(alts, 0);
if (!usb_endpoint_is_isoc_out(epd))
return 0;
return add_implicit_fb_sync_ep(chip, fmt, epd->bEndpointAddress, 0,
alts->desc.bInterfaceNumber, alts);
}
/* Playback and capture EPs on Pioneer devices share the same iface/altset
* for the implicit feedback operation
*/
static bool is_pioneer_implicit_fb(struct snd_usb_audio *chip,
struct usb_host_interface *alts)
{
struct usb_endpoint_descriptor *epd;
if (USB_ID_VENDOR(chip->usb_id) != 0x2b73 &&
USB_ID_VENDOR(chip->usb_id) != 0x08e4)
return false;
if (alts->desc.bInterfaceClass != USB_CLASS_VENDOR_SPEC)
return false;
if (alts->desc.bNumEndpoints != 2)
return false;
epd = get_endpoint(alts, 0);
if (!usb_endpoint_is_isoc_out(epd) ||
(epd->bmAttributes & USB_ENDPOINT_SYNCTYPE) != USB_ENDPOINT_SYNC_ASYNC)
return false;
epd = get_endpoint(alts, 1);
if (!usb_endpoint_is_isoc_in(epd) ||
(epd->bmAttributes & USB_ENDPOINT_SYNCTYPE) != USB_ENDPOINT_SYNC_ASYNC ||
((epd->bmAttributes & USB_ENDPOINT_USAGE_MASK) !=
USB_ENDPOINT_USAGE_DATA &&
(epd->bmAttributes & USB_ENDPOINT_USAGE_MASK) !=
USB_ENDPOINT_USAGE_IMPLICIT_FB))
return false;
return true;
}
static int __add_generic_implicit_fb(struct snd_usb_audio *chip,
struct audioformat *fmt,
int iface, int altset)
{
struct usb_host_interface *alts;
struct usb_endpoint_descriptor *epd;
alts = snd_usb_get_host_interface(chip, iface, altset);
if (!alts)
return 0;
if ((alts->desc.bInterfaceClass != USB_CLASS_VENDOR_SPEC &&
alts->desc.bInterfaceClass != USB_CLASS_AUDIO) ||
alts->desc.bNumEndpoints < 1)
return 0;
epd = get_endpoint(alts, 0);
if (!usb_endpoint_is_isoc_in(epd) ||
(epd->bmAttributes & USB_ENDPOINT_SYNCTYPE) != USB_ENDPOINT_SYNC_ASYNC)
return 0;
return add_implicit_fb_sync_ep(chip, fmt, epd->bEndpointAddress, 0,
iface, alts);
}
/* More generic quirk: look for the sync EP next to the data EP */
static int add_generic_implicit_fb(struct snd_usb_audio *chip,
struct audioformat *fmt,
struct usb_host_interface *alts)
{
if ((fmt->ep_attr & USB_ENDPOINT_SYNCTYPE) != USB_ENDPOINT_SYNC_ASYNC)
return 0;
if (__add_generic_implicit_fb(chip, fmt,
alts->desc.bInterfaceNumber + 1,
alts->desc.bAlternateSetting))
return 1;
return __add_generic_implicit_fb(chip, fmt,
alts->desc.bInterfaceNumber - 1,
alts->desc.bAlternateSetting);
}
static const struct snd_usb_implicit_fb_match *
find_implicit_fb_entry(struct snd_usb_audio *chip,
const struct snd_usb_implicit_fb_match *match,
const struct usb_host_interface *alts)
{
for (; match->id; match++)
if (match->id == chip->usb_id &&
(!match->iface_class ||
(alts->desc.bInterfaceClass == match->iface_class)))
return match;
return NULL;
}
/* Setup an implicit feedback endpoint from a quirk. Returns 0 if no quirk
* applies. Returns 1 if a quirk was found.
*/
static int audioformat_implicit_fb_quirk(struct snd_usb_audio *chip,
struct audioformat *fmt,
struct usb_host_interface *alts)
{
const struct snd_usb_implicit_fb_match *p;
unsigned int attr = fmt->ep_attr & USB_ENDPOINT_SYNCTYPE;
p = find_implicit_fb_entry(chip, playback_implicit_fb_quirks, alts);
if (p) {
switch (p->type) {
case IMPLICIT_FB_GENERIC:
return add_generic_implicit_fb(chip, fmt, alts);
case IMPLICIT_FB_NONE:
return 0; /* No quirk */
case IMPLICIT_FB_FIXED:
return add_implicit_fb_sync_ep(chip, fmt, p->ep_num, 0,
p->iface, NULL);
}
}
/* Special handling for devices with capture quirks */
p = find_implicit_fb_entry(chip, capture_implicit_fb_quirks, alts);
if (p) {
switch (p->type) {
case IMPLICIT_FB_FIXED:
return 0; /* no quirk */
case IMPLICIT_FB_BOTH:
chip->quirk_flags |= QUIRK_FLAG_PLAYBACK_FIRST;
return add_generic_implicit_fb(chip, fmt, alts);
}
}
/* Generic UAC2 implicit feedback */
if (attr == USB_ENDPOINT_SYNC_ASYNC &&
alts->desc.bInterfaceClass == USB_CLASS_AUDIO &&
alts->desc.bInterfaceProtocol == UAC_VERSION_2 &&
alts->desc.bNumEndpoints == 1) {
if (add_generic_uac2_implicit_fb(chip, fmt,
alts->desc.bInterfaceNumber + 1,
alts->desc.bAlternateSetting))
return 1;
}
/* Roland/BOSS implicit feedback with vendor spec class */
if (USB_ID_VENDOR(chip->usb_id) == 0x0582) {
if (add_roland_implicit_fb(chip, fmt, alts) > 0)
return 1;
}
/* Pioneer devices with vendor spec class */
if (is_pioneer_implicit_fb(chip, alts)) {
chip->quirk_flags |= QUIRK_FLAG_PLAYBACK_FIRST;
return add_implicit_fb_sync_ep(chip, fmt,
get_endpoint(alts, 1)->bEndpointAddress,
1, alts->desc.bInterfaceNumber,
alts);
}
/* Try the generic implicit fb if available */
if (chip->generic_implicit_fb ||
(chip->quirk_flags & QUIRK_FLAG_GENERIC_IMPLICIT_FB))
return add_generic_implicit_fb(chip, fmt, alts);
/* No quirk */
return 0;
}
/* same for capture, but only handling FIXED entry */
static int audioformat_capture_quirk(struct snd_usb_audio *chip,
struct audioformat *fmt,
struct usb_host_interface *alts)
{
const struct snd_usb_implicit_fb_match *p;
p = find_implicit_fb_entry(chip, capture_implicit_fb_quirks, alts);
if (p && (p->type == IMPLICIT_FB_FIXED || p->type == IMPLICIT_FB_BOTH))
return add_implicit_fb_sync_ep(chip, fmt, p->ep_num, 0,
p->iface, NULL);
/* Roland/BOSS need full-duplex streams */
if (USB_ID_VENDOR(chip->usb_id) == 0x0582) {
if (add_roland_capture_quirk(chip, fmt, alts) > 0)
return 1;
}
if (is_pioneer_implicit_fb(chip, alts))
return 1; /* skip the quirk, also don't handle generic sync EP */
return 0;
}
/*
* Parse altset and set up implicit feedback endpoint on the audioformat
*/
int snd_usb_parse_implicit_fb_quirk(struct snd_usb_audio *chip,
struct audioformat *fmt,
struct usb_host_interface *alts)
{
if (chip->quirk_flags & QUIRK_FLAG_SKIP_IMPLICIT_FB)
return 0;
if (fmt->endpoint & USB_DIR_IN)
return audioformat_capture_quirk(chip, fmt, alts);
else
return audioformat_implicit_fb_quirk(chip, fmt, alts);
}
/*
* Return the score of matching two audioformats.
* Veto the audioformat if:
* - It has no channels for some reason.
* - Requested PCM format is not supported.
* - Requested sample rate is not supported.
*/
static int match_endpoint_audioformats(struct snd_usb_substream *subs,
const struct audioformat *fp,
int rate, int channels,
snd_pcm_format_t pcm_format)
{
int i, score;
if (fp->channels < 1)
return 0;
if (!(fp->formats & pcm_format_to_bits(pcm_format)))
return 0;
if (fp->rates & SNDRV_PCM_RATE_CONTINUOUS) {
if (rate < fp->rate_min || rate > fp->rate_max)
return 0;
} else {
for (i = 0; i < fp->nr_rates; i++) {
if (fp->rate_table[i] == rate)
break;
}
if (i >= fp->nr_rates)
return 0;
}
score = 1;
if (fp->channels == channels)
score++;
return score;
}
static struct snd_usb_substream *
find_matching_substream(struct snd_usb_audio *chip, int stream, int ep_num,
int fmt_type)
{
struct snd_usb_stream *as;
struct snd_usb_substream *subs;
list_for_each_entry(as, &chip->pcm_list, list) {
subs = &as->substream[stream];
if (as->fmt_type == fmt_type && subs->ep_num == ep_num)
return subs;
}
return NULL;
}
/*
* Return the audioformat that is suitable for the implicit fb
*/
const struct audioformat *
snd_usb_find_implicit_fb_sync_format(struct snd_usb_audio *chip,
const struct audioformat *target,
const struct snd_pcm_hw_params *params,
int stream,
bool *fixed_rate)
{
struct snd_usb_substream *subs;
const struct audioformat *fp, *sync_fmt = NULL;
int score, high_score;
/* Use the original audioformat as fallback for the shared altset */
if (target->iface == target->sync_iface &&
target->altsetting == target->sync_altsetting)
sync_fmt = target;
subs = find_matching_substream(chip, stream, target->sync_ep,
target->fmt_type);
if (!subs)
return sync_fmt;
high_score = 0;
list_for_each_entry(fp, &subs->fmt_list, list) {
score = match_endpoint_audioformats(subs, fp,
params_rate(params),
params_channels(params),
params_format(params));
if (score > high_score) {
sync_fmt = fp;
high_score = score;
}
}
if (fixed_rate)
*fixed_rate = snd_usb_pcm_has_fixed_rate(subs);
return sync_fmt;
}
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