linux-kernel - [PATCH v2 3/4] HID: hid-logitech-hidpp: report battery voltage to the power supply

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Date:   Wed,  5 Jun 2019 15:45:32 -0400
From:   Pedro Vanzella <pedro@...rovanzella.com>
To:     linux-input@...r.kernel.org
Cc:     Pedro Vanzella <pedro@...rovanzella.com>,
        Jiri Kosina <jikos@...nel.org>,
        Benjamin Tissoires <benjamin.tissoires@...hat.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2 3/4] HID: hid-logitech-hidpp: report battery voltage to the power supply

If we know the device supports reading its voltage, report that.

Note that the protocol only gives us the current voltage in millivolts.

Signed-off-by: Pedro Vanzella <pedro@...rovanzella.com>
---
 drivers/hid/hid-logitech-hidpp.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/hid/hid-logitech-hidpp.c b/drivers/hid/hid-logitech-hidpp.c
index 31e99363ab65..d6c59b11b9d2 100644
--- a/drivers/hid/hid-logitech-hidpp.c
+++ b/drivers/hid/hid-logitech-hidpp.c
@@ -1322,6 +1322,7 @@ static enum power_supply_property hidpp_battery_props[] = {
 	POWER_SUPPLY_PROP_SERIAL_NUMBER,
 	0, /* placeholder for POWER_SUPPLY_PROP_CAPACITY, */
 	0, /* placeholder for POWER_SUPPLY_PROP_CAPACITY_LEVEL, */
+	0, /* placeholder for POWER_SUPPLY_PROP_VOLTAGE_NOW, */
 };
 
 static int hidpp_battery_get_property(struct power_supply *psy,
@@ -1359,6 +1360,9 @@ static int hidpp_battery_get_property(struct power_supply *psy,
 		case POWER_SUPPLY_PROP_SERIAL_NUMBER:
 			val->strval = hidpp->hid_dev->uniq;
 			break;
+		case POWER_SUPPLY_PROP_VOLTAGE_NOW:
+			val->intval = hidpp->battery.voltage;
+			break;
 		default:
 			ret = -EINVAL;
 			break;
@@ -3331,7 +3335,7 @@ static int hidpp_initialize_battery(struct hidpp_device *hidpp)
 	if (!battery_props)
 		return -ENOMEM;
 
-	num_battery_props = ARRAY_SIZE(hidpp_battery_props) - 2;
+	num_battery_props = ARRAY_SIZE(hidpp_battery_props) - 3;
 
 	if (hidpp->capabilities & HIDPP_CAPABILITY_BATTERY_MILEAGE)
 		battery_props[num_battery_props++] =
@@ -3341,6 +3345,10 @@ static int hidpp_initialize_battery(struct hidpp_device *hidpp)
 		battery_props[num_battery_props++] =
 				POWER_SUPPLY_PROP_CAPACITY_LEVEL;
 
+	if (hidpp->capabilities & HIDPP_CAPABILITY_BATTERY_VOLTAGE)
+		battery_props[num_battery_props++] =
+			POWER_SUPPLY_PROP_VOLTAGE_NOW;
+
 	battery = &hidpp->battery;
 
 	n = atomic_inc_return(&battery_no) - 1;
-- 
2.21.0