linux-kernel - [PATCH 1/1] power_supply: wilco_ec: Add permanent long life charging mode

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Date:   Tue, 23 Jun 2020 16:20:16 +0800
From:   Crag Wang <crag0715@...il.com>
To:     Sebastian Reichel <sre@...nel.org>
Cc:     mathewk@...omium.org, mario.limonciello@...l.com,
        Crag Wang <crag_wang@...l.com>, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 1/1] power_supply: wilco_ec: Add permanent long life charging mode

This is a long life mode for extended warranty battery, switching
to a differnt mode selection is unavailable. The power charging rate
is customized so that battery at work last longer.

Signed-off-by: Crag Wang <crag_wang@...l.com>
---
 Documentation/ABI/testing/sysfs-class-power-wilco | 3 +++
 drivers/power/supply/power_supply_sysfs.c         | 1 +
 drivers/power/supply/wilco-charger.c              | 5 +++++
 include/linux/power_supply.h                      | 1 +
 4 files changed, 10 insertions(+)

diff --git a/Documentation/ABI/testing/sysfs-class-power-wilco b/Documentation/ABI/testing/sysfs-class-power-wilco
index da1d6ffe5e3c..1c91b17b6fd4 100644
--- a/Documentation/ABI/testing/sysfs-class-power-wilco
+++ b/Documentation/ABI/testing/sysfs-class-power-wilco
@@ -14,6 +14,9 @@ Description:
 			Charging begins when level drops below
 			charge_control_start_threshold, and ceases when
 			level is above charge_control_end_threshold.
+		Permanent Long Life: Last longer battery life, this mode
+			is programmed once in the factory. Switching to a
+			different mode is unavailable.
 
 What:		/sys/class/power_supply/wilco-charger/charge_control_start_threshold
 Date:		April 2019
diff --git a/drivers/power/supply/power_supply_sysfs.c b/drivers/power/supply/power_supply_sysfs.c
index bc79560229b5..af3884015ad8 100644
--- a/drivers/power/supply/power_supply_sysfs.c
+++ b/drivers/power/supply/power_supply_sysfs.c
@@ -87,6 +87,7 @@ static const char * const POWER_SUPPLY_CHARGE_TYPE_TEXT[] = {
 	[POWER_SUPPLY_CHARGE_TYPE_STANDARD]	= "Standard",
 	[POWER_SUPPLY_CHARGE_TYPE_ADAPTIVE]	= "Adaptive",
 	[POWER_SUPPLY_CHARGE_TYPE_CUSTOM]	= "Custom",
+	[POWER_SUPPLY_CHARGE_TYPE_LONGLIFE]	= "Permanent Long Life",
 };
 
 static const char * const POWER_SUPPLY_HEALTH_TEXT[] = {
diff --git a/drivers/power/supply/wilco-charger.c b/drivers/power/supply/wilco-charger.c
index b3c6d7cdd731..713c3018652f 100644
--- a/drivers/power/supply/wilco-charger.c
+++ b/drivers/power/supply/wilco-charger.c
@@ -27,6 +27,7 @@ enum charge_mode {
 	CHARGE_MODE_AC = 3,	/* Mostly AC use, used for Trickle */
 	CHARGE_MODE_AUTO = 4,	/* Used for Adaptive */
 	CHARGE_MODE_CUSTOM = 5,	/* Used for Custom */
+	CHARGE_MODE_LONGLIFE = 6, /* Used for Permanent Long Life */
 };
 
 #define CHARGE_LOWER_LIMIT_MIN	50
@@ -48,6 +49,8 @@ static int psp_val_to_charge_mode(int psp_val)
 		return CHARGE_MODE_AUTO;
 	case POWER_SUPPLY_CHARGE_TYPE_CUSTOM:
 		return CHARGE_MODE_CUSTOM;
+	case POWER_SUPPLY_CHARGE_TYPE_LONGLIFE:
+		return CHARGE_MODE_LONGLIFE;
 	default:
 		return -EINVAL;
 	}
@@ -67,6 +70,8 @@ static int charge_mode_to_psp_val(enum charge_mode mode)
 		return POWER_SUPPLY_CHARGE_TYPE_ADAPTIVE;
 	case CHARGE_MODE_CUSTOM:
 		return POWER_SUPPLY_CHARGE_TYPE_CUSTOM;
+	case CHARGE_MODE_LONGLIFE:
+		return POWER_SUPPLY_CHARGE_TYPE_LONGLIFE;
 	default:
 		return -EINVAL;
 	}
diff --git a/include/linux/power_supply.h b/include/linux/power_supply.h
index ac1345a48ad0..528a3eaa2320 100644
--- a/include/linux/power_supply.h
+++ b/include/linux/power_supply.h
@@ -48,6 +48,7 @@ enum {
 	POWER_SUPPLY_CHARGE_TYPE_STANDARD,	/* normal speed */
 	POWER_SUPPLY_CHARGE_TYPE_ADAPTIVE,	/* dynamically adjusted speed */
 	POWER_SUPPLY_CHARGE_TYPE_CUSTOM,	/* use CHARGE_CONTROL_* props */
+	POWER_SUPPLY_CHARGE_TYPE_LONGLIFE,	/* slow speed, longer life */
 };
 
 enum {
-- 
2.20.1