[PATCH 2/3 v6] battery: Add the ThinkPad "Not Charging" quirk

[Ognjen Galic <smclt30p@gmail.com>]

The EC/ACPI firmware on Lenovo ThinkPads used to report a status
of "Unknown" when the battery is between the charge start and
charge stop thresholds. On Windows, it reports "Not Charging"
so the quirk has been added to also report correctly.

Now the "status" attribute returns "Not Charging" when the
battery on ThinkPads is not physicaly charging.

Tested-by: Kevin Locke <kevin@kevinlocke.name>
Tested-by: Christoph Böhmwalder <christoph@boehmwalder.at>
Signed-off-by: Ognjen Galic <smclt30p@gmail.com>
---
 drivers/acpi/battery.c | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/drivers/acpi/battery.c b/drivers/acpi/battery.c
index 2951d07..81e9b4e 100644
--- a/drivers/acpi/battery.c
+++ b/drivers/acpi/battery.c
@@ -71,6 +71,7 @@ static async_cookie_t async_cookie;
 static bool battery_driver_registered;
 static int battery_bix_broken_package;
 static int battery_notification_delay_ms;
+static int battery_quirk_thinkpad_notcharging;
 static unsigned int cache_time = 1000;
 module_param(cache_time, uint, 0644);
 MODULE_PARM_DESC(cache_time, "cache time in milliseconds");
@@ -222,6 +223,13 @@ static int acpi_battery_get_property(struct power_supply *psy,
 			val->intval = POWER_SUPPLY_STATUS_CHARGING;
 		else if (acpi_battery_is_charged(battery))
 			val->intval = POWER_SUPPLY_STATUS_FULL;
+		/*
+		 * On the Lenovo ThinkPad ACPI implementation, when
+		 * neither bits 0 or 1 are set, that state is
+		 * considered as "Not Charging".
+		 */
+		else if (battery_quirk_thinkpad_notcharging)
+			val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
 		else
 			val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
 		break;
@@ -1301,6 +1309,13 @@ battery_notification_delay_quirk(const struct dmi_system_id *d)
 	return 0;
 }
 
+static int __init
+battery_quirk_not_charging(const struct dmi_system_id *d)
+{
+	battery_quirk_thinkpad_notcharging = 1;
+	return 0;
+}
+
 static const struct dmi_system_id bat_dmi_table[] __initconst = {
 	{
 		.callback = battery_bix_broken_package_quirk,
@@ -1318,6 +1333,14 @@ static const struct dmi_system_id bat_dmi_table[] __initconst = {
 			DMI_MATCH(DMI_PRODUCT_NAME, "Aspire V5-573G"),
 		},
 	},
+	{
+		.callback = battery_quirk_not_charging,
+		.ident = "Lenovo ThinkPad",
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
+			DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad"),
+		},
+	},
 	{},
 };
 
-- 
2.7.4