1 // SPDX-License-Identifier: GPL-2.0-or-later 2 // 3 // Special handling for implicit feedback mode 4 // 5 6 #include <linux/init.h> 7 #include <linux/usb.h> 8 #include <linux/usb/audio.h> 9 #include <linux/usb/audio-v2.h> 10 11 #include <sound/core.h> 12 #include <sound/pcm.h> 13 #include <sound/pcm_params.h> 14 15 #include "usbaudio.h" 16 #include "card.h" 17 #include "helper.h" 18 #include "implicit.h" 19 20 enum { 21 IMPLICIT_FB_NONE, 22 IMPLICIT_FB_GENERIC, 23 IMPLICIT_FB_FIXED, 24 }; 25 26 struct snd_usb_implicit_fb_match { 27 unsigned int id; 28 unsigned int iface_class; 29 unsigned int ep_num; 30 unsigned int iface; 31 int type; 32 }; 33 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),\ 38 .iface = (ifnum) } 39 #define IMPLICIT_FB_SKIP_DEV(vend, prod) \ 40 { .id = USB_ID(vend, prod), .type = IMPLICIT_FB_NONE } 41 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 */ 50 51 /* Fixed EP */ 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 */ 64 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 */ 72 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 */ 81 82 {} /* terminator */ 83 }; 84 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 */ 94 95 {} /* terminator */ 96 }; 97 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) 103 { 104 struct usb_interface *iface; 105 106 if (!alts) { 107 iface = usb_ifnum_to_if(chip->dev, ifnum); 108 if (!iface || iface->num_altsetting < 2) 109 return 0; 110 alts = &iface->altsetting[1]; 111 } 112 113 fmt->sync_ep = ep; 114 fmt->sync_iface = ifnum; 115 fmt->sync_altsetting = alts->desc.bAlternateSetting; 116 fmt->sync_ep_idx = ep_idx; 117 fmt->implicit_fb = 1; 118 usb_audio_dbg(chip, 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); 123 return 1; 124 } 125 126 /* 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, 129 unsigned int ifnum, 130 unsigned int altsetting) 131 { 132 struct usb_host_interface *alts; 133 struct usb_endpoint_descriptor *epd; 134 135 alts = snd_usb_get_host_interface(chip, ifnum, altsetting); 136 if (!alts) 137 return 0; 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) 142 return 0; 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) 147 return 0; 148 return add_implicit_fb_sync_ep(chip, fmt, epd->bEndpointAddress, 0, 149 ifnum, alts); 150 } 151 152 /* 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, 155 unsigned int ifnum, 156 unsigned int altsetting) 157 { 158 struct usb_host_interface *alts; 159 struct usb_endpoint_descriptor *epd; 160 161 alts = snd_usb_get_host_interface(chip, ifnum, altsetting); 162 if (!alts) 163 return 0; 164 if (alts->desc.bInterfaceClass != USB_CLASS_VENDOR_SPEC || 165 (alts->desc.bInterfaceSubClass != 2 && 166 alts->desc.bInterfaceProtocol != 2) || 167 alts->desc.bNumEndpoints < 1) 168 return 0; 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) 173 return 0; 174 return add_implicit_fb_sync_ep(chip, fmt, epd->bEndpointAddress, 0, 175 ifnum, alts); 176 } 177 178 /* 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. 181 */ 182 static int skip_pioneer_sync_ep(struct snd_usb_audio *chip, 183 struct audioformat *fmt, 184 struct usb_host_interface *alts) 185 { 186 struct usb_endpoint_descriptor *epd; 187 188 if (alts->desc.bNumEndpoints != 2) 189 return 0; 190 191 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)) 198 return 0; 199 return 1; /* don't handle with the implicit fb, just skip sync EP */ 200 } 201 202 static int __add_generic_implicit_fb(struct snd_usb_audio *chip, 203 struct audioformat *fmt, 204 int iface, int altset) 205 { 206 struct usb_host_interface *alts; 207 struct usb_endpoint_descriptor *epd; 208 209 alts = snd_usb_get_host_interface(chip, iface, altset); 210 if (!alts) 211 return 0; 212 213 if ((alts->desc.bInterfaceClass != USB_CLASS_VENDOR_SPEC && 214 alts->desc.bInterfaceClass != USB_CLASS_AUDIO) || 215 alts->desc.bNumEndpoints < 1) 216 return 0; 217 epd = get_endpoint(alts, 0); 218 if (!usb_endpoint_is_isoc_in(epd) || 219 (epd->bmAttributes & USB_ENDPOINT_SYNCTYPE) != USB_ENDPOINT_SYNC_ASYNC) 220 return 0; 221 return add_implicit_fb_sync_ep(chip, fmt, epd->bEndpointAddress, 0, 222 iface, alts); 223 } 224 225 /* 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) 229 { 230 if ((fmt->ep_attr & USB_ENDPOINT_SYNCTYPE) != USB_ENDPOINT_SYNC_ASYNC) 231 return 0; 232 233 if (__add_generic_implicit_fb(chip, fmt, 234 alts->desc.bInterfaceNumber + 1, 235 alts->desc.bAlternateSetting)) 236 return 1; 237 return __add_generic_implicit_fb(chip, fmt, 238 alts->desc.bInterfaceNumber - 1, 239 alts->desc.bAlternateSetting); 240 } 241 242 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) 246 { 247 for (; match->id; match++) 248 if (match->id == chip->usb_id && 249 (!match->iface_class || 250 (alts->desc.bInterfaceClass == match->iface_class))) 251 return match; 252 253 return NULL; 254 } 255 256 /* Setup an implicit feedback endpoint from a quirk. Returns 0 if no quirk 257 * applies. Returns 1 if a quirk was found. 258 */ 259 static int audioformat_implicit_fb_quirk(struct snd_usb_audio *chip, 260 struct audioformat *fmt, 261 struct usb_host_interface *alts) 262 { 263 const struct snd_usb_implicit_fb_match *p; 264 unsigned int attr = fmt->ep_attr & USB_ENDPOINT_SYNCTYPE; 265 266 p = find_implicit_fb_entry(chip, playback_implicit_fb_quirks, alts); 267 if (p) { 268 switch (p->type) { 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, 275 p->iface, NULL); 276 } 277 } 278 279 /* 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)) 287 return 1; 288 } 289 290 /* 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)) 299 return 1; 300 } 301 302 /* 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 USB_ID_VENDOR(chip->usb_id) == 0x08e4 /* Pioneer */)) { 307 if (skip_pioneer_sync_ep(chip, fmt, alts)) 308 return 1; 309 } 310 311 /* Try the generic implicit fb if available */ 312 if (chip->generic_implicit_fb) 313 return add_generic_implicit_fb(chip, fmt, alts); 314 315 /* No quirk */ 316 return 0; 317 } 318 319 /* same for capture, but only handling FIXED entry */ 320 static int audioformat_capture_quirk(struct snd_usb_audio *chip, 321 struct audioformat *fmt, 322 struct usb_host_interface *alts) 323 { 324 const struct snd_usb_implicit_fb_match *p; 325 326 p = find_implicit_fb_entry(chip, capture_implicit_fb_quirks, alts); 327 if (p && p->type == IMPLICIT_FB_FIXED) 328 return add_implicit_fb_sync_ep(chip, fmt, p->ep_num, 0, 329 p->iface, NULL); 330 return 0; 331 } 332 333 /* 334 * Parse altset and set up implicit feedback endpoint on the audioformat 335 */ 336 int snd_usb_parse_implicit_fb_quirk(struct snd_usb_audio *chip, 337 struct audioformat *fmt, 338 struct usb_host_interface *alts) 339 { 340 if (fmt->endpoint & USB_DIR_IN) 341 return audioformat_capture_quirk(chip, fmt, alts); 342 else 343 return audioformat_implicit_fb_quirk(chip, fmt, alts); 344 } 345 346 /* 347 * Return the score of matching two audioformats. 348 * Veto the audioformat if: 349 * - It has no channels for some reason. 350 * - Requested PCM format is not supported. 351 * - Requested sample rate is not supported. 352 */ 353 static int match_endpoint_audioformats(struct snd_usb_substream *subs, 354 const struct audioformat *fp, 355 int rate, int channels, 356 snd_pcm_format_t pcm_format) 357 { 358 int i, score; 359 360 if (fp->channels < 1) 361 return 0; 362 363 if (!(fp->formats & pcm_format_to_bits(pcm_format))) 364 return 0; 365 366 if (fp->rates & SNDRV_PCM_RATE_CONTINUOUS) { 367 if (rate < fp->rate_min || rate > fp->rate_max) 368 return 0; 369 } else { 370 for (i = 0; i < fp->nr_rates; i++) { 371 if (fp->rate_table[i] == rate) 372 break; 373 } 374 if (i >= fp->nr_rates) 375 return 0; 376 } 377 378 score = 1; 379 if (fp->channels == channels) 380 score++; 381 382 return score; 383 } 384 385 static struct snd_usb_substream * 386 find_matching_substream(struct snd_usb_audio *chip, int stream, int ep_num, 387 int fmt_type) 388 { 389 struct snd_usb_stream *as; 390 struct snd_usb_substream *subs; 391 392 list_for_each_entry(as, &chip->pcm_list, list) { 393 subs = &as->substream[stream]; 394 if (as->fmt_type == fmt_type && subs->ep_num == ep_num) 395 return subs; 396 } 397 398 return NULL; 399 } 400 401 /* 402 * Return the audioformat that is suitable for the implicit fb 403 */ 404 const struct audioformat * 405 snd_usb_find_implicit_fb_sync_format(struct snd_usb_audio *chip, 406 const struct audioformat *target, 407 const struct snd_pcm_hw_params *params, 408 int stream) 409 { 410 struct snd_usb_substream *subs; 411 const struct audioformat *fp, *sync_fmt = NULL; 412 int score, high_score; 413 414 /* Use the original audioformat as fallback for the shared altset */ 415 if (target->iface == target->sync_iface && 416 target->altsetting == target->sync_altsetting) 417 sync_fmt = target; 418 419 subs = find_matching_substream(chip, stream, target->sync_ep, 420 target->fmt_type); 421 if (!subs) 422 return sync_fmt; 423 424 high_score = 0; 425 list_for_each_entry(fp, &subs->fmt_list, list) { 426 score = match_endpoint_audioformats(subs, fp, 427 params_rate(params), 428 params_channels(params), 429 params_format(params)); 430 if (score > high_score) { 431 sync_fmt = fp; 432 high_score = score; 433 } 434 } 435 436 return sync_fmt; 437 } 438 439