diff options
| -rw-r--r-- | include/uapi/linux/usb/audio.h | 37 | ||||
| -rw-r--r-- | sound/usb/mixer.c | 16 |
2 files changed, 47 insertions, 6 deletions
diff --git a/include/uapi/linux/usb/audio.h b/include/uapi/linux/usb/audio.h index ddc5396800aa..76b7c3f6cd0d 100644 --- a/include/uapi/linux/usb/audio.h +++ b/include/uapi/linux/usb/audio.h @@ -450,6 +450,43 @@ static inline __u8 *uac_processing_unit_specific(struct uac_processing_unit_desc } } +/* + * Extension Unit (XU) has almost compatible layout with Processing Unit, but + * on UAC2, it has a different bmControls size (bControlSize); it's 1 byte for + * XU while 2 bytes for PU. The last iExtension field is a one-byte index as + * well as iProcessing field of PU. + */ +static inline __u8 uac_extension_unit_bControlSize(struct uac_processing_unit_descriptor *desc, + int protocol) +{ + switch (protocol) { + case UAC_VERSION_1: + return desc->baSourceID[desc->bNrInPins + 4]; + case UAC_VERSION_2: + return 1; /* in UAC2, this value is constant */ + case UAC_VERSION_3: + return 4; /* in UAC3, this value is constant */ + default: + return 1; + } +} + +static inline __u8 uac_extension_unit_iExtension(struct uac_processing_unit_descriptor *desc, + int protocol) +{ + __u8 control_size = uac_extension_unit_bControlSize(desc, protocol); + + switch (protocol) { + case UAC_VERSION_1: + case UAC_VERSION_2: + default: + return *(uac_processing_unit_bmControls(desc, protocol) + + control_size); + case UAC_VERSION_3: + return 0; /* UAC3 does not have this field */ + } +} + /* 4.5.2 Class-Specific AS Interface Descriptor */ struct uac1_as_header_descriptor { __u8 bLength; /* in bytes: 7 */ diff --git a/sound/usb/mixer.c b/sound/usb/mixer.c index e003b5e7b01a..ac121b10c51c 100644 --- a/sound/usb/mixer.c +++ b/sound/usb/mixer.c @@ -2318,7 +2318,7 @@ static struct procunit_info extunits[] = { */ static int build_audio_procunit(struct mixer_build *state, int unitid, void *raw_desc, struct procunit_info *list, - char *name) + bool extension_unit) { struct uac_processing_unit_descriptor *desc = raw_desc; int num_ins; @@ -2335,6 +2335,8 @@ static int build_audio_procunit(struct mixer_build *state, int unitid, static struct procunit_info default_info = { 0, NULL, default_value_info }; + const char *name = extension_unit ? + "Extension Unit" : "Processing Unit"; if (desc->bLength < 13) { usb_audio_err(state->chip, "invalid %s descriptor (id %d)\n", name, unitid); @@ -2448,7 +2450,10 @@ static int build_audio_procunit(struct mixer_build *state, int unitid, } else if (info->name) { strlcpy(kctl->id.name, info->name, sizeof(kctl->id.name)); } else { - nameid = uac_processing_unit_iProcessing(desc, state->mixer->protocol); + if (extension_unit) + nameid = uac_extension_unit_iExtension(desc, state->mixer->protocol); + else + nameid = uac_processing_unit_iProcessing(desc, state->mixer->protocol); len = 0; if (nameid) len = snd_usb_copy_string_desc(state->chip, @@ -2481,10 +2486,10 @@ static int parse_audio_processing_unit(struct mixer_build *state, int unitid, case UAC_VERSION_2: default: return build_audio_procunit(state, unitid, raw_desc, - procunits, "Processing Unit"); + procunits, false); case UAC_VERSION_3: return build_audio_procunit(state, unitid, raw_desc, - uac3_procunits, "Processing Unit"); + uac3_procunits, false); } } @@ -2495,8 +2500,7 @@ static int parse_audio_extension_unit(struct mixer_build *state, int unitid, * Note that we parse extension units with processing unit descriptors. * That's ok as the layout is the same. */ - return build_audio_procunit(state, unitid, raw_desc, - extunits, "Extension Unit"); + return build_audio_procunit(state, unitid, raw_desc, extunits, true); } /* |