[alsa-devel] [PATCH 2/5] ALSA: usbaudio: introduce new types for audio class v2
Daniel Mack
daniel at caiaq.de
Mon Feb 22 23:49:10 CET 2010
This patch adds some definitions for audio class v2.
Unfortunately, the UNIT types PROCESSING_UNIT and EXTENSION_UNIT have
different numerical representations in both standards, so there is need
for a _V1 add-on now. usbmixer.c is changed accordingly.
Signed-off-by: Daniel Mack <daniel at caiaq.de>
---
include/linux/usb/audio.h | 57 +++++++++++++++++++++++++++++++++++++++++++++
sound/usb/usbaudio.h | 19 ++++++++++++--
sound/usb/usbmixer.c | 14 +++++-----
3 files changed, 80 insertions(+), 10 deletions(-)
diff --git a/include/linux/usb/audio.h b/include/linux/usb/audio.h
index 44f82d8..fb1a97b 100644
--- a/include/linux/usb/audio.h
+++ b/include/linux/usb/audio.h
@@ -25,6 +25,9 @@
#define USB_SUBCLASS_AUDIOSTREAMING 0x02
#define USB_SUBCLASS_MIDISTREAMING 0x03
+#define UAC_VERSION_1 0x00
+#define UAC_VERSION_2 0x20
+
/* A.5 Audio Class-Specific AC Interface Descriptor Subtypes */
#define UAC_HEADER 0x01
#define UAC_INPUT_TERMINAL 0x02
@@ -180,6 +183,19 @@ struct uac_as_header_descriptor_v1 {
__le16 wFormatTag; /* The Audio Data Format */
} __attribute__ ((packed));
+struct uac_as_header_descriptor_v2 {
+ __u8 bLength;
+ __u8 bDescriptorType;
+ __u8 bDescriptorSubtype;
+ __u8 bTerminalLink;
+ __u8 bmControls;
+ __u8 bFormatType;
+ __u32 bmFormats;
+ __u8 bNrChannels;
+ __u32 bmChannelConfig;
+ __u8 iChannelNames;
+} __attribute__((packed));
+
#define UAC_DT_AS_HEADER_SIZE 7
/* Formats - A.1.1 Audio Data Format Type I Codes */
@@ -232,6 +248,19 @@ struct uac_format_type_i_discrete_descriptor_##n { \
#define UAC_FORMAT_TYPE_I_DISCRETE_DESC_SIZE(n) (8 + (n * 3))
+struct uac_format_type_i_ext_descriptor {
+ __u8 bLength;
+ __u8 bDescriptorType;
+ __u8 bDescriptorSubtype;
+ __u8 bSubslotSize;
+ __u8 bFormatType;
+ __u8 bBitResolution;
+ __u8 bHeaderLength;
+ __u8 bControlSize;
+ __u8 bSideBandProtocol;
+} __attribute__((packed));
+
+
/* Formats - Audio Data Format Type I Codes */
struct uac_format_type_ii_discrete_descriptor {
@@ -245,11 +274,26 @@ struct uac_format_type_ii_discrete_descriptor {
__u8 tSamFreq[][3];
} __attribute__((packed));
+struct uac_format_type_ii_ext_descriptor {
+ __u8 bLength;
+ __u8 bDescriptorType;
+ __u8 bDescriptorSubtype;
+ __u8 bFormatType;
+ __u16 wMaxBitRate;
+ __u16 wSamplesPerFrame;
+ __u8 bHeaderLength;
+ __u8 bSideBandProtocol;
+} __attribute__((packed));
+
+
/* Formats - A.2 Format Type Codes */
#define UAC_FORMAT_TYPE_UNDEFINED 0x0
#define UAC_FORMAT_TYPE_I 0x1
#define UAC_FORMAT_TYPE_II 0x2
#define UAC_FORMAT_TYPE_III 0x3
+#define UAC_EXT_FORMAT_TYPE_I 0x81
+#define UAC_EXT_FORMAT_TYPE_II 0x82
+#define UAC_EXT_FORMAT_TYPE_III 0x83
struct uac_iso_endpoint_descriptor {
__u8 bLength; /* in bytes: 7 */
@@ -265,6 +309,19 @@ struct uac_iso_endpoint_descriptor {
#define UAC_EP_CS_ATTR_PITCH_CONTROL 0x02
#define UAC_EP_CS_ATTR_FILL_MAX 0x80
+/* Audio class v2.0: CLOCK_SOURCE descriptor */
+
+struct uac_clock_source_descriptor {
+ __u8 bLength;
+ __u8 bDescriptorType;
+ __u8 bDescriptorSubtype;
+ __u8 bClockID;
+ __u8 bmAttributes;
+ __u8 bmControls;
+ __u8 bAssocTerminal;
+ __u8 iClockSource;
+} __attribute__((packed));
+
/* A.10.2 Feature Unit Control Selectors */
struct uac_feature_unit_descriptor {
diff --git a/sound/usb/usbaudio.h b/sound/usb/usbaudio.h
index 9d8cea4..4f48293 100644
--- a/sound/usb/usbaudio.h
+++ b/sound/usb/usbaudio.h
@@ -36,8 +36,17 @@
#define MIXER_UNIT 0x04
#define SELECTOR_UNIT 0x05
#define FEATURE_UNIT 0x06
-#define PROCESSING_UNIT 0x07
-#define EXTENSION_UNIT 0x08
+#define PROCESSING_UNIT_V1 0x07
+#define EXTENSION_UNIT_V1 0x08
+
+/* audio class v2 */
+#define EFFECT_UNIT 0x07
+#define PROCESSING_UNIT_V2 0x08
+#define EXTENSION_UNIT_V2 0x09
+#define CLOCK_SOURCE 0x0a
+#define CLOCK_SELECTOR 0x0b
+#define CLOCK_MULTIPLIER 0x0c
+#define SAMPLE_RATE_CONVERTER 0x0d
#define AS_GENERAL 0x01
#define FORMAT_TYPE 0x02
@@ -60,7 +69,7 @@
#define EP_CS_ATTR_PITCH_CONTROL 0x02
#define EP_CS_ATTR_FILL_MAX 0x80
-/* Audio Class specific Request Codes */
+/* Audio Class specific Request Codes (v1) */
#define SET_CUR 0x01
#define GET_CUR 0x81
@@ -74,6 +83,10 @@
#define GET_MEM 0x85
#define GET_STAT 0xff
+/* Audio Class specific Request Codes (v2) */
+#define CS_CUR 0x01
+#define CS_RANGE 0x02
+
/* Terminal Control Selectors */
#define COPY_PROTECT_CONTROL 0x01
diff --git a/sound/usb/usbmixer.c b/sound/usb/usbmixer.c
index 3631595..5c21400 100644
--- a/sound/usb/usbmixer.c
+++ b/sound/usb/usbmixer.c
@@ -282,7 +282,7 @@ static void *find_audio_control_unit(struct mixer_build *state, unsigned char un
while ((p = snd_usb_find_desc(state->buffer, state->buflen, p,
USB_DT_CS_INTERFACE)) != NULL) {
- if (p[0] >= 4 && p[2] >= INPUT_TERMINAL && p[2] <= EXTENSION_UNIT && p[3] == unit)
+ if (p[0] >= 4 && p[2] >= INPUT_TERMINAL && p[2] <= EXTENSION_UNIT_V1 && p[3] == unit)
return p;
}
return NULL;
@@ -603,9 +603,9 @@ static int get_term_name(struct mixer_build *state, struct usb_audio_term *iterm
switch (iterm->type >> 16) {
case SELECTOR_UNIT:
strcpy(name, "Selector"); return 8;
- case PROCESSING_UNIT:
+ case PROCESSING_UNIT_V1:
strcpy(name, "Process Unit"); return 12;
- case EXTENSION_UNIT:
+ case EXTENSION_UNIT_V1:
strcpy(name, "Ext Unit"); return 8;
case MIXER_UNIT:
strcpy(name, "Mixer"); return 5;
@@ -669,8 +669,8 @@ static int check_input_term(struct mixer_build *state, int id, struct usb_audio_
term->id = id;
term->name = p1[9 + p1[0] - 1];
return 0;
- case PROCESSING_UNIT:
- case EXTENSION_UNIT:
+ case PROCESSING_UNIT_V1:
+ case EXTENSION_UNIT_V1:
if (p1[6] == 1) {
id = p1[7];
break; /* continue to parse */
@@ -1743,9 +1743,9 @@ static int parse_audio_unit(struct mixer_build *state, int unitid)
return parse_audio_selector_unit(state, unitid, p1);
case FEATURE_UNIT:
return parse_audio_feature_unit(state, unitid, p1);
- case PROCESSING_UNIT:
+ case PROCESSING_UNIT_V1:
return parse_audio_processing_unit(state, unitid, p1);
- case EXTENSION_UNIT:
+ case EXTENSION_UNIT_V1:
return parse_audio_extension_unit(state, unitid, p1);
default:
snd_printk(KERN_ERR "usbaudio: unit %u: unexpected type 0x%02x\n", unitid, p1[2]);
--
1.6.6.2
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