[PATCH 3/5] power: supply: core: add wireless signal strength property

[Qiwu Huang]

From: Qiwu Huang <huangqiwu@xxxxxxxxxx>

reports wireless signal strength.
The value show degree of coupling between tx and rx.

Signed-off-by: Qiwu Huang <huangqiwu@xxxxxxxxxx>
---
 Documentation/ABI/testing/sysfs-class-power | 9 ++++++++-
 drivers/power/supply/power_supply_sysfs.c   | 1 +
 include/linux/power_supply.h                | 1 +
 3 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/Documentation/ABI/testing/sysfs-class-power b/Documentation/ABI/testing/sysfs-class-power
index 2099cf194a89..1f42aa0c071e 100644
--- a/Documentation/ABI/testing/sysfs-class-power
+++ b/Documentation/ABI/testing/sysfs-class-power
@@ -730,4 +730,11 @@ Description:
 
 		Access: Read-Only
 		Valid values: "ADAPTER_NONE", "ADAPTER_SDP", "ADAPTER_DCP", "ADAPTER_CDP",
-		"ADAPTER_QC2", "ADAPTER_QC3", "ADAPTER_PD" or other private adapter.
\ No newline at end of file
+		"ADAPTER_QC2", "ADAPTER_QC3", "ADAPTER_PD" or other private adapter.
+
+What:		/sys/class/power_supply/<supply_name>/signal_strength
+Date:		Jul 2020
+Contact:	Fei Jiang <jiangfei1@xxxxxxxxxx>
+Description:
+		Reports wireless signal strength.
+		The value show degree of coupling.
\ No newline at end of file
diff --git a/drivers/power/supply/power_supply_sysfs.c b/drivers/power/supply/power_supply_sysfs.c
index c864a14829ec..42fbe1b68255 100644
--- a/drivers/power/supply/power_supply_sysfs.c
+++ b/drivers/power/supply/power_supply_sysfs.c
@@ -208,6 +208,7 @@ static struct power_supply_attr power_supply_attrs[] = {
 	POWER_SUPPLY_ATTR(SERIAL_NUMBER),
 	POWER_SUPPLY_ATTR(quick_charge_type),
 	POWER_SUPPLY_ATTR(tx_adapter),
+	POWER_SUPPLY_ATTR(signal_strength),
 };
 
 static struct attribute *
diff --git a/include/linux/power_supply.h b/include/linux/power_supply.h
index 2de9a4c93723..397fb8e96b03 100644
--- a/include/linux/power_supply.h
+++ b/include/linux/power_supply.h
@@ -169,6 +169,7 @@ enum power_supply_property {
 	POWER_SUPPLY_PROP_SERIAL_NUMBER,
 	POWER_SUPPLY_PROP_QUICK_CHARGE_TYPE,
 	POWER_SUPPLY_PROP_TX_ADAPTER,
+	POWER_SUPPLY_PROP_SIGNAL_STRENGTH,
 };
 
 enum power_supply_type {
-- 
2.26.0