[Bluetooth] Support for tracking the voice setting

This patch makes sure that the Bluetooth core layer always knows the
current voice setting. It will be read on device initialization and
then stored in the hci_dev structure.

include/net/bluetooth/hci.h

@@ -253,6 +253,17 @@ struct hci_cp_write_dev_class {
 	__u8     dev_class[3];
 } __attribute__ ((packed));
 
+#define OCF_READ_VOICE_SETTING	0x0025
+struct hci_rp_read_voice_setting {
+	__u8	status;
+	__u16	voice_setting;
+} __attribute__ ((packed));
+
+#define OCF_WRITE_VOICE_SETTING	0x0026
+struct hci_cp_write_voice_setting {
+	__u16	voice_setting;
+} __attribute__ ((packed));
+
 #define OCF_HOST_BUFFER_SIZE	0x0033
 struct hci_cp_host_buffer_size {
 	__u16    acl_mtu;

include/net/bluetooth/hci_core.h

@@ -71,6 +71,7 @@ struct hci_dev {
 	__u8	 	type;
 	bdaddr_t	bdaddr;
 	__u8		features[8];
+	__u16		voice_setting;
 
 	__u16		pkt_type;
 	__u16		link_policy;

net/bluetooth/hci_core.c

@@ -237,6 +237,9 @@ static void hci_init_req(struct hci_dev *hdev, unsigned long opt)
 	/* Read BD Address */
 	hci_send_cmd(hdev, OGF_INFO_PARAM, OCF_READ_BD_ADDR, 0, NULL);
 
+	/* Read Voice Setting */
+	hci_send_cmd(hdev, OGF_HOST_CTL, OCF_READ_VOICE_SETTING, 0, NULL);
+
 	/* Optional initialization */
 
 	/* Clear Event Filters */

net/bluetooth/hci_event.c

@@ -123,6 +123,8 @@ static void hci_cc_link_policy(struct hci_dev *hdev, __u16 ocf, struct sk_buff *
 static void hci_cc_host_ctl(struct hci_dev *hdev, __u16 ocf, struct sk_buff *skb)
 {
 	__u8 status, param;
+	__u16 setting;
+	struct hci_rp_read_voice_setting *vs;
 	void *sent;
 
 	BT_DBG("%s ocf 0x%x", hdev->name, ocf);
@@ -198,6 +200,7 @@ static void hci_cc_host_ctl(struct hci_dev *hdev, __u16 ocf, struct sk_buff *skb
 		sent = hci_sent_cmd_data(hdev, OGF_HOST_CTL, OCF_WRITE_SCAN_ENABLE);
 		if (!sent)
 			break;
+
 		status = *((__u8 *) skb->data);
 		param  = *((__u8 *) sent);
 
@@ -215,6 +218,39 @@ static void hci_cc_host_ctl(struct hci_dev *hdev, __u16 ocf, struct sk_buff *skb
 		hci_req_complete(hdev, status);
 		break;
 
+	case OCF_READ_VOICE_SETTING:
+		vs = (struct hci_rp_read_voice_setting *) skb->data;
+
+		if (vs->status) {
+			BT_DBG("%s READ_VOICE_SETTING failed %d", hdev->name, vc->status);
+			break;
+		}
+
+		setting = __le16_to_cpu(vs->voice_setting);
+
+		if (hdev->voice_setting != setting ) {
+			hdev->voice_setting = setting;
+
+			BT_DBG("%s: voice setting 0x%04x", hdev->name, setting);
+		}
+		break;
+
+	case OCF_WRITE_VOICE_SETTING:
+		sent = hci_sent_cmd_data(hdev, OGF_HOST_CTL, OCF_WRITE_VOICE_SETTING);
+		if (!sent)
+			break;
+
+		status = *((__u8 *) skb->data);
+		setting = __le16_to_cpu(get_unaligned((__u16 *) sent));
+
+		if (!status && hdev->voice_setting != setting) {
+			hdev->voice_setting = setting;
+
+			BT_DBG("%s: voice setting 0x%04x", hdev->name, setting);
+		}
+		hci_req_complete(hdev, status);
+		break;
+
 	case OCF_HOST_BUFFER_SIZE:
 		status = *((__u8 *) skb->data);
 		if (status) {