Bluetooth: controller: Implement Read Build Info cmd

Implement the Read Build Information VS command. This returns a UTF-8
encoded string, which is extendable by the user via a new Kconfig
option.

Signed-off-by: Carles Cufi <[email protected]>

Author: carlescufi

subsys/bluetooth/controller/Kconfig

@@ -37,6 +37,17 @@ config BT_CTLR_HCI_VS_EXT
 	  Enable support for the Zephyr HCI Vendor-Specific Extensions in the
 	  Controller.
 
+config BT_CTLR_HCI_VS_BUILD_INFO
+	string "Zephyr HCI VS Build Info string"
+	default ""
+	depends on BT_CTLR_HCI_VS_EXT
+	help
+	  User-defined string that will be returned by the Zephyr VS Read Build
+	  Information command after the Zephyr version and build time. When
+	  setting this to a value different from an empty string, a space
+	  character is required at the beginning to separate it from the
+	  already included information.
+
 config BT_CTLR_DUP_FILTER_LEN
 	prompt "Number of addresses in the scan duplicate filter"
 	int

subsys/bluetooth/controller/hci/hci.c

@@ -1674,8 +1674,8 @@ static void vs_read_supported_commands(struct net_buf *buf,
 	/* Set Version Information, Supported Commands, Supported Features. */
 	rp->commands[0] |= BIT(0) | BIT(1) | BIT(2);
 #if defined(CONFIG_BT_CTLR_HCI_VS_EXT)
-	/* Write BD_ADDR */
-	rp->commands[0] |= BIT(5);
+	/* Write BD_ADDR, Read Build Info */
+	rp->commands[0] |= BIT(5) | BIT(7);
 	/* Read Static Addresses, Read Key Hierarchy Roots */
 	rp->commands[1] |= BIT(0) | BIT(1);
 #endif /* CONFIG_BT_CTLR_HCI_VS_EXT */
@@ -1704,6 +1704,29 @@ static void vs_write_bd_addr(struct net_buf *buf, struct net_buf **evt)
 	ccst->status = 0x00;
 }
 
+static void vs_read_build_info(struct net_buf *buf, struct net_buf **evt)
+{
+	struct bt_hci_rp_vs_read_build_info *rp;
+
+#define BUILD_TIMESTAMP " " __DATE__ " " __TIME__
+
+#define HCI_VS_BUILD_INFO "Zephyr OS v" \
+	KERNEL_VERSION_STRING BUILD_TIMESTAMP CONFIG_BT_CTLR_HCI_VS_BUILD_INFO
+
+	const char build_info[] = HCI_VS_BUILD_INFO;
+
+#define BUILD_INFO_EVT_LEN (sizeof(struct bt_hci_evt_hdr) + \
+			    sizeof(struct bt_hci_evt_cmd_complete) + \
+			    sizeof(struct bt_hci_rp_vs_read_build_info) + \
+			    sizeof(build_info))
+
+	BUILD_ASSERT(CONFIG_BT_RX_BUF_LEN >= BUILD_INFO_EVT_LEN);
+
+	rp = cmd_complete(evt, sizeof(*rp) + sizeof(build_info));
+	rp->status = 0x00;
+	memcpy(rp->info, build_info, sizeof(build_info));
+}
+
 static void vs_read_static_addrs(struct net_buf *buf, struct net_buf **evt)
 {
 	struct bt_hci_rp_vs_read_static_addrs *rp;
@@ -1809,6 +1832,10 @@ static int vendor_cmd_handle(u16_t ocf, struct net_buf *cmd,
 		break;
 
 #if defined(CONFIG_BT_CTLR_HCI_VS_EXT)
+	case BT_OCF(BT_HCI_OP_VS_READ_BUILD_INFO):
+		vs_read_build_info(cmd, evt);
+		break;
+
 	case BT_OCF(BT_HCI_OP_VS_WRITE_BD_ADDR):
 		vs_write_bd_addr(cmd, evt);
 		break;