Add experiemental code for audio service ipc.

2 files changed, 72 insertions, 11 deletions

diff --git a/audio/ipc.h b/audio/ipc.h
index 119aa7b3..e6859a50 100644
--- a/audio/ipc.h
+++ b/audio/ipc.h
@@ -31,19 +31,71 @@
 #define UNIX_PATH_MAX 108
 #endif
 
-struct ipc_hdr {
-	uint16_t id;
-	uint16_t type;
-	uint16_t seqnum;
-	uint16_t length;
+/* Supported roles */
+#define PKT_ROLE_NONE		0
+#define PKT_ROLE_AUTO		1
+#define PKT_ROLE_VOICE		2
+#define PKT_ROLE_HIFI		3
+
+/* Packet types */
+#define PKT_TYPE_CFG_REQ	0
+#define PKT_TYPE_CFG_RSP	1
+#define PKT_TYPE_STATUS_REQ	3
+#define PKT_TYPE_STATUS_RSP	4
+#define PKT_TYPE_CTL_REQ	5
+#define PKT_TYPE_CTL_RSP	6
+
+/* Errors codes */
+#define PKT_ERROR_NONE		0
+
+struct ipc_packet {
+	uint8_t id;		/* Device id */
+	uint8_t role;		/* Audio role eg: voice, wifi, auto... */
+	uint8_t type;		/* Packet type */
+	uint8_t error;		/* Packet error code */
+	uint8_t length;		/* Payload length in bytes */
+	uint8_t data[0];	/* Packet payload */
 } __attribute__ ((packed));
 
-struct ipc_connect_cmd {
-	uint8_t src[6];
-	uint8_t dst[6];
-	uint16_t uuid;
+/* File descriptor options */
+#define CFG_FD_OPT_READ		0
+#define CFG_FD_OPT_WRITE	1
+#define CFG_FD_OPT_READWRITE	2
+
+struct ipc_data_cfg {
+	int fd;			/* Stream file descriptor */
+	uint8_t fd_opt;		/* Stream file descriptor options: read, write or readwrite*/
+	uint8_t encoding;	/* Stream encoding */
+	uint8_t bitpool;	/* Encoding bitpool */
+	uint8_t channels;	/* Number of audio channel */
+	uint16_t rate;		/* Stream sample rate */
 } __attribute__ ((packed));
 
-struct ipc_connect_evt {
-	uint16_t id;
+/* Device status */
+#define STATUS_DISCONNECTED	0
+#define STATUS_CONNECTING	1
+#define STATUS_CONNECTED	2
+#define STATUS_STREAMING	3
+
+struct ipc_data_status {
+	uint8_t status;		/* Stream status */
 } __attribute__ ((packed));
+
+/* Supported control operations */
+#define DATA_CTL_POWER		0x40
+#define DATA_CTL_VOL_UP		0x41
+#define DATA_CTL_VOL_DOWN	0x42
+#define DATA_CTL_MUTE		0x43
+#define DATA_CTL_PLAY		0x44
+#define DATA_CTL_STOP		0x45
+#define DATA_CTL_PAUSE		0x46
+#define DATA_CTL_RECORD		0x47
+#define DATA_CTL_REWIND		0x48
+#define DATA_CTL_FAST_FORWARD	0x49
+#define DATA_CTL_EJECT		0x4A
+#define DATA_CTL_FORWARD	0x4B
+#define DATA_CTL_BACKWARD	0x4C
+
+struct ipc_data_ctl {
+	uint8_t operation;	/* Operation ID */
+}  __attribute__ ((packed));
diff --git a/audio/pcm_bluetooth.c b/audio/pcm_bluetooth.c
index 838dcd39..3e473d6c 100644
--- a/audio/pcm_bluetooth.c
+++ b/audio/pcm_bluetooth.c
@@ -182,6 +182,15 @@ SND_PCM_PLUGIN_DEFINE_FUNC(bluetooth)
 		return -EINVAL;
 	}
 
+	if((stream == SND_PCM_STREAM_PLAYBACK) && (opened_for & OPENED_PLAYBACK)) {
+		SNDERR("Cannot open Bluetooth Headset PCM plugin twice for playback.");
+		return -EINVAL;
+	}
+	if((stream == SND_PCM_STREAM_CAPTURE) && (opened_for & OPENED_CAPTURE)) {
+		SNDERR("Cannot open Bluetooth Headset PCM plugin twice for capture.");
+		return -EINVAL;
+	}
+
 	id = abs(getpid() * rand());
 
 	sk = socket(PF_LOCAL, SOCK_DGRAM, 0);