diff options
Diffstat (limited to 'sound/usb/quirks.c')
-rw-r--r-- | sound/usb/quirks.c | 175 |
1 files changed, 175 insertions, 0 deletions
diff --git a/sound/usb/quirks.c b/sound/usb/quirks.c index 3879eae..5363bcc 100644 --- a/sound/usb/quirks.c +++ b/sound/usb/quirks.c @@ -18,6 +18,7 @@ #include <linux/slab.h> #include <linux/usb.h> #include <linux/usb/audio.h> +#include <linux/usb/midi.h> #include <sound/control.h> #include <sound/core.h> @@ -175,6 +176,178 @@ static int create_fixed_stream_quirk(struct snd_usb_audio *chip, return 0; } +static int create_auto_pcm_quirk(struct snd_usb_audio *chip, + struct usb_interface *iface, + struct usb_driver *driver) +{ + struct usb_host_interface *alts; + struct usb_interface_descriptor *altsd; + struct usb_endpoint_descriptor *epd; + struct uac1_as_header_descriptor *ashd; + struct uac_format_type_i_discrete_descriptor *fmtd; + + /* + * Most Roland/Yamaha audio streaming interfaces have more or less + * standard descriptors, but older devices might lack descriptors, and + * future ones might change, so ensure that we fail silently if the + * interface doesn't look exactly right. + */ + + /* must have a non-zero altsetting for streaming */ + if (iface->num_altsetting < 2) + return -ENODEV; + alts = &iface->altsetting[1]; + altsd = get_iface_desc(alts); + + /* must have an isochronous endpoint for streaming */ + if (altsd->bNumEndpoints < 1) + return -ENODEV; + epd = get_endpoint(alts, 0); + if (!usb_endpoint_xfer_isoc(epd)) + return -ENODEV; + + /* must have format descriptors */ + ashd = snd_usb_find_csint_desc(alts->extra, alts->extralen, NULL, + UAC_AS_GENERAL); + fmtd = snd_usb_find_csint_desc(alts->extra, alts->extralen, NULL, + UAC_FORMAT_TYPE); + if (!ashd || ashd->bLength < 7 || + !fmtd || fmtd->bLength < 8) + return -ENODEV; + + return create_standard_audio_quirk(chip, iface, driver, NULL); +} + +static int create_yamaha_midi_quirk(struct snd_usb_audio *chip, + struct usb_interface *iface, + struct usb_driver *driver, + struct usb_host_interface *alts) +{ + static const struct snd_usb_audio_quirk yamaha_midi_quirk = { + .type = QUIRK_MIDI_YAMAHA + }; + struct usb_midi_in_jack_descriptor *injd; + struct usb_midi_out_jack_descriptor *outjd; + + /* must have some valid jack descriptors */ + injd = snd_usb_find_csint_desc(alts->extra, alts->extralen, + NULL, USB_MS_MIDI_IN_JACK); + outjd = snd_usb_find_csint_desc(alts->extra, alts->extralen, + NULL, USB_MS_MIDI_OUT_JACK); + if (!injd && !outjd) + return -ENODEV; + if (injd && (injd->bLength < 5 || + (injd->bJackType != USB_MS_EMBEDDED && + injd->bJackType != USB_MS_EXTERNAL))) + return -ENODEV; + if (outjd && (outjd->bLength < 6 || + (outjd->bJackType != USB_MS_EMBEDDED && + outjd->bJackType != USB_MS_EXTERNAL))) + return -ENODEV; + return create_any_midi_quirk(chip, iface, driver, &yamaha_midi_quirk); +} + +static int create_roland_midi_quirk(struct snd_usb_audio *chip, + struct usb_interface *iface, + struct usb_driver *driver, + struct usb_host_interface *alts) +{ + static const struct snd_usb_audio_quirk roland_midi_quirk = { + .type = QUIRK_MIDI_ROLAND + }; + u8 *roland_desc = NULL; + + /* might have a vendor-specific descriptor <06 24 F1 02 ...> */ + for (;;) { + roland_desc = snd_usb_find_csint_desc(alts->extra, + alts->extralen, + roland_desc, 0xf1); + if (!roland_desc) + return -ENODEV; + if (roland_desc[0] < 6 || roland_desc[3] != 2) + continue; + return create_any_midi_quirk(chip, iface, driver, + &roland_midi_quirk); + } +} + +static int create_std_midi_quirk(struct snd_usb_audio *chip, + struct usb_interface *iface, + struct usb_driver *driver, + struct usb_host_interface *alts) +{ + struct usb_ms_header_descriptor *mshd; + struct usb_ms_endpoint_descriptor *msepd; + + /* must have the MIDIStreaming interface header descriptor*/ + mshd = (struct usb_ms_header_descriptor *)alts->extra; + if (alts->extralen < 7 || + mshd->bLength < 7 || + mshd->bDescriptorType != USB_DT_CS_INTERFACE || + mshd->bDescriptorSubtype != USB_MS_HEADER) + return -ENODEV; + /* must have the MIDIStreaming endpoint descriptor*/ + msepd = (struct usb_ms_endpoint_descriptor *)alts->endpoint[0].extra; + if (alts->endpoint[0].extralen < 4 || + msepd->bLength < 4 || + msepd->bDescriptorType != USB_DT_CS_ENDPOINT || + msepd->bDescriptorSubtype != UAC_MS_GENERAL || + msepd->bNumEmbMIDIJack < 1 || + msepd->bNumEmbMIDIJack > 16) + return -ENODEV; + + return create_any_midi_quirk(chip, iface, driver, NULL); +} + +static int create_auto_midi_quirk(struct snd_usb_audio *chip, + struct usb_interface *iface, + struct usb_driver *driver) +{ + struct usb_host_interface *alts; + struct usb_interface_descriptor *altsd; + struct usb_endpoint_descriptor *epd; + int err; + + alts = &iface->altsetting[0]; + altsd = get_iface_desc(alts); + + /* must have at least one bulk/interrupt endpoint for streaming */ + if (altsd->bNumEndpoints < 1) + return -ENODEV; + epd = get_endpoint(alts, 0); + if (!usb_endpoint_xfer_bulk(epd) || + !usb_endpoint_xfer_int(epd)) + return -ENODEV; + + switch (USB_ID_VENDOR(chip->usb_id)) { + case 0x0499: /* Yamaha */ + err = create_yamaha_midi_quirk(chip, iface, driver, alts); + if (err < 0 && err != -ENODEV) + return err; + break; + case 0x0582: /* Roland */ + err = create_roland_midi_quirk(chip, iface, driver, alts); + if (err < 0 && err != -ENODEV) + return err; + break; + } + + return create_std_midi_quirk(chip, iface, driver, alts); +} + +static int create_autodetect_quirk(struct snd_usb_audio *chip, + struct usb_interface *iface, + struct usb_driver *driver, + const struct snd_usb_audio_quirk *quirk) +{ + int err; + + err = create_auto_pcm_quirk(chip, iface, driver); + if (err == -ENODEV) + err = create_auto_midi_quirk(chip, iface, driver); + return err; +} + /* * Create a stream for an Edirol UA-700/UA-25/UA-4FX interface. * The only way to detect the sample rate is by looking at wMaxPacketSize. @@ -303,9 +476,11 @@ int snd_usb_create_quirk(struct snd_usb_audio *chip, static const quirk_func_t quirk_funcs[] = { [QUIRK_IGNORE_INTERFACE] = ignore_interface_quirk, [QUIRK_COMPOSITE] = create_composite_quirk, + [QUIRK_AUTODETECT] = create_autodetect_quirk, [QUIRK_MIDI_STANDARD_INTERFACE] = create_any_midi_quirk, [QUIRK_MIDI_FIXED_ENDPOINT] = create_any_midi_quirk, [QUIRK_MIDI_YAMAHA] = create_any_midi_quirk, + [QUIRK_MIDI_ROLAND] = create_any_midi_quirk, [QUIRK_MIDI_MIDIMAN] = create_any_midi_quirk, [QUIRK_MIDI_NOVATION] = create_any_midi_quirk, [QUIRK_MIDI_RAW_BYTES] = create_any_midi_quirk, |