Bluetooth: controller: Add Tx Power Kconfig option

Add support for changing the default Tx Power value using
Kconfig option.

Signed-off-by: Vinayak Kariappa Chettimada <vich@nordicsemi.no>

subsys/bluetooth/controller/Kconfig

@@ -108,6 +108,67 @@ config BT_CTLR_TX_BUFFER_SIZE
 	  Maximum is set to 16384 due to implementation limitations (use of
 	  u16_t for size/length variables).
 
+choice
+	prompt "Tx Power"
+	default BT_CTLR_TX_PWR_0
+	help
+	  Select the supported BLE Radio transmit power level in dBm.
+
+config BT_CTLR_TX_PWR_PLUS_8
+	bool "+8 dBm"
+	depends on SOC_NRF52840
+
+config BT_CTLR_TX_PWR_PLUS_7
+	bool "+7 dBm"
+	depends on SOC_NRF52840
+
+config BT_CTLR_TX_PWR_PLUS_6
+	bool "+6 dBm"
+	depends on SOC_NRF52840
+
+config BT_CTLR_TX_PWR_PLUS_5
+	bool "+5 dBm"
+	depends on SOC_NRF52840
+
+config BT_CTLR_TX_PWR_PLUS_4
+	bool "+4 dBm"
+
+config BT_CTLR_TX_PWR_PLUS_3
+	bool "+3 dBm"
+	depends on SOC_SERIES_NRF52X
+
+config BT_CTLR_TX_PWR_PLUS_2
+	bool "+2 dBm"
+	depends on SOC_NRF52840
+
+config BT_CTLR_TX_PWR_0
+	bool "0 dBm"
+
+config BT_CTLR_TX_PWR_MINUS_4
+	bool "-4 dBm"
+
+config BT_CTLR_TX_PWR_MINUS_8
+	bool "-8 dBm"
+
+config BT_CTLR_TX_PWR_MINUS_12
+	bool "-12 dBm"
+
+config BT_CTLR_TX_PWR_MINUS_16
+	bool "-16 dBm"
+
+config BT_CTLR_TX_PWR_MINUS_20
+	bool "-20 dBm"
+
+config BT_CTLR_TX_PWR_MINUS_30
+	bool "-30 dBm"
+	depends on SOC_SERIES_NRF51X
+
+config BT_CTLR_TX_PWR_MINUS_40
+	bool "-40 dBm"
+	depends on SOC_SERIES_NRF52X
+
+endchoice
+
 config BT_CTLR_COMPANY_ID
 	prompt "Company Id"
 	hex

subsys/bluetooth/controller/hal/nrf5/radio/radio.c

@@ -108,7 +108,7 @@ void radio_phy_set(u8_t phy, u8_t flags)
 
 void radio_tx_power_set(u32_t power)
 {
-	/* TODO map power to h/w values. */
+	/* NOTE: valid value range is passed by Kconfig define. */
 	NRF_RADIO->TXPOWER = power;
 }
 

subsys/bluetooth/controller/hal/nrf5/radio/radio_nrf5_txp.h

@@ -0,0 +1,37 @@
+/*
+ * Copyright (c) 2018 Nordic Semiconductor ASA
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#if defined(CONFIG_BT_CTLR_TX_PWR_PLUS_8)
+#define RADIO_TXP_DEFAULT RADIO_TXPOWER_TXPOWER_Pos8dBm
+#elif defined(CONFIG_BT_CTLR_TX_PWR_PLUS_7)
+#define RADIO_TXP_DEFAULT RADIO_TXPOWER_TXPOWER_Pos7dBm
+#elif defined(CONFIG_BT_CTLR_TX_PWR_PLUS_6)
+#define RADIO_TXP_DEFAULT RADIO_TXPOWER_TXPOWER_Pos6dBm
+#elif defined(CONFIG_BT_CTLR_TX_PWR_PLUS_5)
+#define RADIO_TXP_DEFAULT RADIO_TXPOWER_TXPOWER_Pos5dBm
+#elif defined(CONFIG_BT_CTLR_TX_PWR_PLUS_4)
+#define RADIO_TXP_DEFAULT RADIO_TXPOWER_TXPOWER_Pos4dBm
+#elif defined(CONFIG_BT_CTLR_TX_PWR_PLUS_3)
+#define RADIO_TXP_DEFAULT RADIO_TXPOWER_TXPOWER_Pos3dBm
+#elif defined(CONFIG_BT_CTLR_TX_PWR_PLUS_2)
+#define RADIO_TXP_DEFAULT RADIO_TXPOWER_TXPOWER_Pos2dBm
+#elif defined(CONFIG_BT_CTLR_TX_PWR_0)
+#define RADIO_TXP_DEFAULT RADIO_TXPOWER_TXPOWER_0dBm
+#elif defined(CONFIG_BT_CTLR_TX_PWR_MINUS_4)
+#define RADIO_TXP_DEFAULT RADIO_TXPOWER_TXPOWER_Neg4dBm
+#elif defined(CONFIG_BT_CTLR_TX_PWR_MINUS_8)
+#define RADIO_TXP_DEFAULT RADIO_TXPOWER_TXPOWER_Neg8dBm
+#elif defined(CONFIG_BT_CTLR_TX_PWR_MINUS_12)
+#define RADIO_TXP_DEFAULT RADIO_TXPOWER_TXPOWER_Neg12dBm
+#elif defined(CONFIG_BT_CTLR_TX_PWR_MINUS_16)
+#define RADIO_TXP_DEFAULT RADIO_TXPOWER_TXPOWER_Neg16dBm
+#elif defined(CONFIG_BT_CTLR_TX_PWR_MINUS_20)
+#define RADIO_TXP_DEFAULT RADIO_TXPOWER_TXPOWER_Neg20dBm
+#elif defined(CONFIG_BT_CTLR_TX_PWR_MINUS_30)
+#define RADIO_TXP_DEFAULT RADIO_TXPOWER_TXPOWER_Neg30dBm
+#elif defined(CONFIG_BT_CTLR_TX_PWR_MINUS_40)
+#define RADIO_TXP_DEFAULT RADIO_TXPOWER_TXPOWER_Neg40dBm
+#endif

subsys/bluetooth/controller/hal/radio_txp.h

@@ -0,0 +1,9 @@
+/*
+ * Copyright (c) 2018 Nordic Semiconductor ASA
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#if defined(CONFIG_SOC_FAMILY_NRF)
+#include "nrf5/radio/radio_nrf5_txp.h"
+#endif

subsys/bluetooth/controller/ll_sw/ctrl.c

@@ -25,6 +25,7 @@
 #include "hal/ecb.h"
 #include "hal/ccm.h"
 #include "hal/radio.h"
+#include "hal/radio_txp.h"
 #include "hal/ticker.h"
 #include "hal/debug.h"
 
@@ -5879,7 +5880,7 @@ again:
 static void adv_scan_conn_configure(void)
 {
 	radio_reset();
-	radio_tx_power_set(0);
+	radio_tx_power_set(RADIO_TXP_DEFAULT);
 	radio_isr_set(isr);
 }