1 // SPDX-License-Identifier: GPL-2.0-or-later
3 // Special handling for implicit feedback mode
6 #include <linux/init.h>
8 #include <linux/usb/audio.h>
9 #include <linux/usb/audio-v2.h>
11 #include <sound/core.h>
12 #include <sound/pcm.h>
13 #include <sound/pcm_params.h>
26 struct snd_usb_implicit_fb_match {
28 unsigned int iface_class;
34 #define IMPLICIT_FB_GENERIC_DEV(vend, prod) \
35 { .id = USB_ID(vend, prod), .type = IMPLICIT_FB_GENERIC }
36 #define IMPLICIT_FB_FIXED_DEV(vend, prod, ep, ifnum) \
37 { .id = USB_ID(vend, prod), .type = IMPLICIT_FB_FIXED, .ep_num = (ep),\
39 #define IMPLICIT_FB_SKIP_DEV(vend, prod) \
40 { .id = USB_ID(vend, prod), .type = IMPLICIT_FB_NONE }
42 /* Implicit feedback quirk table for playback */
43 static const struct snd_usb_implicit_fb_match playback_implicit_fb_quirks[] = {
44 /* Generic matching */
45 IMPLICIT_FB_GENERIC_DEV(0x0499, 0x1509), /* Steinberg UR22 */
46 IMPLICIT_FB_GENERIC_DEV(0x0763, 0x2080), /* M-Audio FastTrack Ultra */
47 IMPLICIT_FB_GENERIC_DEV(0x0763, 0x2081), /* M-Audio FastTrack Ultra */
48 IMPLICIT_FB_GENERIC_DEV(0x0763, 0x2030), /* M-Audio Fast Track C400 */
49 IMPLICIT_FB_GENERIC_DEV(0x0763, 0x2031), /* M-Audio Fast Track C600 */
52 /* FIXME: check the availability of generic matching */
53 IMPLICIT_FB_FIXED_DEV(0x1397, 0x0001, 0x81, 1), /* Behringer UFX1604 */
54 IMPLICIT_FB_FIXED_DEV(0x1397, 0x0002, 0x81, 1), /* Behringer UFX1204 */
55 IMPLICIT_FB_FIXED_DEV(0x2466, 0x8010, 0x81, 2), /* Fractal Audio Axe-Fx III */
56 IMPLICIT_FB_FIXED_DEV(0x31e9, 0x0001, 0x81, 2), /* Solid State Logic SSL2 */
57 IMPLICIT_FB_FIXED_DEV(0x31e9, 0x0002, 0x81, 2), /* Solid State Logic SSL2+ */
58 IMPLICIT_FB_FIXED_DEV(0x0499, 0x172f, 0x81, 2), /* Steinberg UR22C */
59 IMPLICIT_FB_FIXED_DEV(0x0d9a, 0x00df, 0x81, 2), /* RTX6001 */
60 IMPLICIT_FB_FIXED_DEV(0x22f0, 0x0006, 0x81, 3), /* Allen&Heath Qu-16 */
61 IMPLICIT_FB_FIXED_DEV(0x1686, 0xf029, 0x82, 2), /* Zoom UAC-2 */
62 IMPLICIT_FB_FIXED_DEV(0x2466, 0x8003, 0x86, 2), /* Fractal Audio Axe-Fx II */
63 IMPLICIT_FB_FIXED_DEV(0x0499, 0x172a, 0x86, 2), /* Yamaha MODX */
65 /* Special matching */
66 { .id = USB_ID(0x07fd, 0x0004), .iface_class = USB_CLASS_AUDIO,
67 .type = IMPLICIT_FB_NONE }, /* MicroBook IIc */
68 /* ep = 0x84, ifnum = 0 */
69 { .id = USB_ID(0x07fd, 0x0004), .iface_class = USB_CLASS_VENDOR_SPEC,
70 .type = IMPLICIT_FB_FIXED,
71 .ep_num = 0x84, .iface = 0 }, /* MOTU MicroBook II */
73 /* No quirk for playback but with capture quirk (see below) */
74 IMPLICIT_FB_SKIP_DEV(0x0582, 0x0130), /* BOSS BR-80 */
75 IMPLICIT_FB_SKIP_DEV(0x0582, 0x0171), /* BOSS RC-505 */
76 IMPLICIT_FB_SKIP_DEV(0x0582, 0x0189), /* BOSS GT-100v2 */
77 IMPLICIT_FB_SKIP_DEV(0x0582, 0x01d6), /* BOSS GT-1 */
78 IMPLICIT_FB_SKIP_DEV(0x0582, 0x01d8), /* BOSS Katana */
79 IMPLICIT_FB_SKIP_DEV(0x0582, 0x01e5), /* BOSS GT-001 */
80 IMPLICIT_FB_SKIP_DEV(0x0582, 0x0203), /* BOSS AD-10 */
85 /* Implicit feedback quirk table for capture: only FIXED type */
86 static const struct snd_usb_implicit_fb_match capture_implicit_fb_quirks[] = {
87 IMPLICIT_FB_FIXED_DEV(0x0582, 0x0130, 0x0d, 0x01), /* BOSS BR-80 */
88 IMPLICIT_FB_FIXED_DEV(0x0582, 0x0171, 0x0d, 0x01), /* BOSS RC-505 */
89 IMPLICIT_FB_FIXED_DEV(0x0582, 0x0189, 0x0d, 0x01), /* BOSS GT-100v2 */
90 IMPLICIT_FB_FIXED_DEV(0x0582, 0x01d6, 0x0d, 0x01), /* BOSS GT-1 */
91 IMPLICIT_FB_FIXED_DEV(0x0582, 0x01d8, 0x0d, 0x01), /* BOSS Katana */
92 IMPLICIT_FB_FIXED_DEV(0x0582, 0x01e5, 0x0d, 0x01), /* BOSS GT-001 */
93 IMPLICIT_FB_FIXED_DEV(0x0582, 0x0203, 0x0d, 0x01), /* BOSS AD-10 */
98 /* set up sync EP information on the audioformat */
99 static int add_implicit_fb_sync_ep(struct snd_usb_audio *chip,
100 struct audioformat *fmt,
101 int ep, int ep_idx, int ifnum,
102 const struct usb_host_interface *alts)
104 struct usb_interface *iface;
107 iface = usb_ifnum_to_if(chip->dev, ifnum);
108 if (!iface || iface->num_altsetting < 2)
110 alts = &iface->altsetting[1];
114 fmt->sync_iface = ifnum;
115 fmt->sync_altsetting = alts->desc.bAlternateSetting;
116 fmt->sync_ep_idx = ep_idx;
117 fmt->implicit_fb = 1;
119 "%d:%d: added %s implicit_fb sync_ep %x, iface %d:%d\n",
120 fmt->iface, fmt->altsetting,
121 (ep & USB_DIR_IN) ? "playback" : "capture",
122 fmt->sync_ep, fmt->sync_iface, fmt->sync_altsetting);
126 /* Check whether the given UAC2 iface:altset points to an implicit fb source */
127 static int add_generic_uac2_implicit_fb(struct snd_usb_audio *chip,
128 struct audioformat *fmt,
130 unsigned int altsetting)
132 struct usb_host_interface *alts;
133 struct usb_endpoint_descriptor *epd;
135 alts = snd_usb_get_host_interface(chip, ifnum, altsetting);
138 if (alts->desc.bInterfaceClass != USB_CLASS_AUDIO ||
139 alts->desc.bInterfaceSubClass != USB_SUBCLASS_AUDIOSTREAMING ||
140 alts->desc.bInterfaceProtocol != UAC_VERSION_2 ||
141 alts->desc.bNumEndpoints < 1)
143 epd = get_endpoint(alts, 0);
144 if (!usb_endpoint_is_isoc_in(epd) ||
145 (epd->bmAttributes & USB_ENDPOINT_USAGE_MASK) !=
146 USB_ENDPOINT_USAGE_IMPLICIT_FB)
148 return add_implicit_fb_sync_ep(chip, fmt, epd->bEndpointAddress, 0,
152 /* Like the function above, but specific to Roland with vendor class and hack */
153 static int add_roland_implicit_fb(struct snd_usb_audio *chip,
154 struct audioformat *fmt,
156 unsigned int altsetting)
158 struct usb_host_interface *alts;
159 struct usb_endpoint_descriptor *epd;
161 alts = snd_usb_get_host_interface(chip, ifnum, altsetting);
164 if (alts->desc.bInterfaceClass != USB_CLASS_VENDOR_SPEC ||
165 (alts->desc.bInterfaceSubClass != 2 &&
166 alts->desc.bInterfaceProtocol != 2) ||
167 alts->desc.bNumEndpoints < 1)
169 epd = get_endpoint(alts, 0);
170 if (!usb_endpoint_is_isoc_in(epd) ||
171 (epd->bmAttributes & USB_ENDPOINT_USAGE_MASK) !=
172 USB_ENDPOINT_USAGE_IMPLICIT_FB)
174 return add_implicit_fb_sync_ep(chip, fmt, epd->bEndpointAddress, 0,
178 /* Playback and capture EPs on Pioneer devices share the same iface/altset,
179 * but they don't seem working with the implicit fb mode well, hence we
180 * just return as if the sync were already set up.
182 static int skip_pioneer_sync_ep(struct snd_usb_audio *chip,
183 struct audioformat *fmt,
184 struct usb_host_interface *alts)
186 struct usb_endpoint_descriptor *epd;
188 if (alts->desc.bNumEndpoints != 2)
191 epd = get_endpoint(alts, 1);
192 if (!usb_endpoint_is_isoc_in(epd) ||
193 (epd->bmAttributes & USB_ENDPOINT_SYNCTYPE) != USB_ENDPOINT_SYNC_ASYNC ||
194 ((epd->bmAttributes & USB_ENDPOINT_USAGE_MASK) !=
195 USB_ENDPOINT_USAGE_DATA &&
196 (epd->bmAttributes & USB_ENDPOINT_USAGE_MASK) !=
197 USB_ENDPOINT_USAGE_IMPLICIT_FB))
199 return 1; /* don't handle with the implicit fb, just skip sync EP */
202 static int __add_generic_implicit_fb(struct snd_usb_audio *chip,
203 struct audioformat *fmt,
204 int iface, int altset)
206 struct usb_host_interface *alts;
207 struct usb_endpoint_descriptor *epd;
209 alts = snd_usb_get_host_interface(chip, iface, altset);
213 if ((alts->desc.bInterfaceClass != USB_CLASS_VENDOR_SPEC &&
214 alts->desc.bInterfaceClass != USB_CLASS_AUDIO) ||
215 alts->desc.bNumEndpoints < 1)
217 epd = get_endpoint(alts, 0);
218 if (!usb_endpoint_is_isoc_in(epd) ||
219 (epd->bmAttributes & USB_ENDPOINT_SYNCTYPE) != USB_ENDPOINT_SYNC_ASYNC)
221 return add_implicit_fb_sync_ep(chip, fmt, epd->bEndpointAddress, 0,
225 /* More generic quirk: look for the sync EP next to the data EP */
226 static int add_generic_implicit_fb(struct snd_usb_audio *chip,
227 struct audioformat *fmt,
228 struct usb_host_interface *alts)
230 if ((fmt->ep_attr & USB_ENDPOINT_SYNCTYPE) != USB_ENDPOINT_SYNC_ASYNC)
233 if (__add_generic_implicit_fb(chip, fmt,
234 alts->desc.bInterfaceNumber + 1,
235 alts->desc.bAlternateSetting))
237 return __add_generic_implicit_fb(chip, fmt,
238 alts->desc.bInterfaceNumber - 1,
239 alts->desc.bAlternateSetting);
242 static const struct snd_usb_implicit_fb_match *
243 find_implicit_fb_entry(struct snd_usb_audio *chip,
244 const struct snd_usb_implicit_fb_match *match,
245 const struct usb_host_interface *alts)
247 for (; match->id; match++)
248 if (match->id == chip->usb_id &&
249 (!match->iface_class ||
250 (alts->desc.bInterfaceClass == match->iface_class)))
256 /* Setup an implicit feedback endpoint from a quirk. Returns 0 if no quirk
257 * applies. Returns 1 if a quirk was found.
259 static int audioformat_implicit_fb_quirk(struct snd_usb_audio *chip,
260 struct audioformat *fmt,
261 struct usb_host_interface *alts)
263 const struct snd_usb_implicit_fb_match *p;
264 unsigned int attr = fmt->ep_attr & USB_ENDPOINT_SYNCTYPE;
266 p = find_implicit_fb_entry(chip, playback_implicit_fb_quirks, alts);
269 case IMPLICIT_FB_GENERIC:
270 return add_generic_implicit_fb(chip, fmt, alts);
271 case IMPLICIT_FB_NONE:
272 return 0; /* No quirk */
273 case IMPLICIT_FB_FIXED:
274 return add_implicit_fb_sync_ep(chip, fmt, p->ep_num, 0,
279 /* Generic UAC2 implicit feedback */
280 if (attr == USB_ENDPOINT_SYNC_ASYNC &&
281 alts->desc.bInterfaceClass == USB_CLASS_AUDIO &&
282 alts->desc.bInterfaceProtocol == UAC_VERSION_2 &&
283 alts->desc.bNumEndpoints == 1) {
284 if (add_generic_uac2_implicit_fb(chip, fmt,
285 alts->desc.bInterfaceNumber + 1,
286 alts->desc.bAlternateSetting))
290 /* Roland/BOSS implicit feedback with vendor spec class */
291 if (attr == USB_ENDPOINT_SYNC_ASYNC &&
292 alts->desc.bInterfaceClass == USB_CLASS_VENDOR_SPEC &&
293 alts->desc.bInterfaceProtocol == 2 &&
294 alts->desc.bNumEndpoints == 1 &&
295 USB_ID_VENDOR(chip->usb_id) == 0x0582 /* Roland */) {
296 if (add_roland_implicit_fb(chip, fmt,
297 alts->desc.bInterfaceNumber + 1,
298 alts->desc.bAlternateSetting))
302 /* Pioneer devices with vendor spec class */
303 if (attr == USB_ENDPOINT_SYNC_ASYNC &&
304 alts->desc.bInterfaceClass == USB_CLASS_VENDOR_SPEC &&
305 USB_ID_VENDOR(chip->usb_id) == 0x2b73 /* Pioneer */) {
306 if (skip_pioneer_sync_ep(chip, fmt, alts))
310 /* Try the generic implicit fb if available */
311 if (chip->generic_implicit_fb)
312 return add_generic_implicit_fb(chip, fmt, alts);
318 /* same for capture, but only handling FIXED entry */
319 static int audioformat_capture_quirk(struct snd_usb_audio *chip,
320 struct audioformat *fmt,
321 struct usb_host_interface *alts)
323 const struct snd_usb_implicit_fb_match *p;
325 p = find_implicit_fb_entry(chip, capture_implicit_fb_quirks, alts);
326 if (p && p->type == IMPLICIT_FB_FIXED)
327 return add_implicit_fb_sync_ep(chip, fmt, p->ep_num, 0,
333 * Parse altset and set up implicit feedback endpoint on the audioformat
335 int snd_usb_parse_implicit_fb_quirk(struct snd_usb_audio *chip,
336 struct audioformat *fmt,
337 struct usb_host_interface *alts)
339 if (fmt->endpoint & USB_DIR_IN)
340 return audioformat_capture_quirk(chip, fmt, alts);
342 return audioformat_implicit_fb_quirk(chip, fmt, alts);
346 * Return the score of matching two audioformats.
347 * Veto the audioformat if:
348 * - It has no channels for some reason.
349 * - Requested PCM format is not supported.
350 * - Requested sample rate is not supported.
352 static int match_endpoint_audioformats(struct snd_usb_substream *subs,
353 const struct audioformat *fp,
354 int rate, int channels,
355 snd_pcm_format_t pcm_format)
359 if (fp->channels < 1)
362 if (!(fp->formats & pcm_format_to_bits(pcm_format)))
365 if (fp->rates & SNDRV_PCM_RATE_CONTINUOUS) {
366 if (rate < fp->rate_min || rate > fp->rate_max)
369 for (i = 0; i < fp->nr_rates; i++) {
370 if (fp->rate_table[i] == rate)
373 if (i >= fp->nr_rates)
378 if (fp->channels == channels)
384 static struct snd_usb_substream *
385 find_matching_substream(struct snd_usb_audio *chip, int stream, int ep_num,
388 struct snd_usb_stream *as;
389 struct snd_usb_substream *subs;
391 list_for_each_entry(as, &chip->pcm_list, list) {
392 subs = &as->substream[stream];
393 if (as->fmt_type == fmt_type && subs->ep_num == ep_num)
401 * Return the audioformat that is suitable for the implicit fb
403 const struct audioformat *
404 snd_usb_find_implicit_fb_sync_format(struct snd_usb_audio *chip,
405 const struct audioformat *target,
406 const struct snd_pcm_hw_params *params,
409 struct snd_usb_substream *subs;
410 const struct audioformat *fp, *sync_fmt = NULL;
411 int score, high_score;
413 /* Use the original audioformat as fallback for the shared altset */
414 if (target->iface == target->sync_iface &&
415 target->altsetting == target->sync_altsetting)
418 subs = find_matching_substream(chip, stream, target->sync_ep,
424 list_for_each_entry(fp, &subs->fmt_list, list) {
425 score = match_endpoint_audioformats(subs, fp,
427 params_channels(params),
428 params_format(params));
429 if (score > high_score) {