// 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(0x19f7, 0x000a, 0x84, 3), /* RODE AI-1 */	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)		goto end; 	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;		}	}  end:	if (fixed_rate)		*fixed_rate = snd_usb_pcm_has_fixed_rate(subs);	return sync_fmt;}