Unlike for example ThinkPads where this control is granular here it is
just off/on. When off it charges to 100%. When on it charges to about 80%.
Controlling this setting is done via HCI register 0x00ba. Setting to value
1 will result in limiting the charing to 80% of the battery capacity,
while setting it to 0 will allow charging to 100%.
Reading the current state is a bit weird, and needs a 1 set in the last
position of the query for whatever reason. In addition, the read may
return 0x8d20 (Data not available) rarely, so a retry mechanism is needed.
According to the Windows program used to control the feature the setting
will not take effect until the battery has been discharged to around 50%.
However, in my testing it takes effect as soon as the charge drops below
80%. On Windows Toshiba branded this feature as "Eco charging".
Signed-off-by: Arvid Norlander <lkml@xxxxxxxxx>
---
drivers/platform/x86/toshiba_acpi.c | 110 ++++++++++++++++++++++++++++
1 file changed, 110 insertions(+)
diff --git a/drivers/platform/x86/toshiba_acpi.c b/drivers/platform/x86/toshiba_acpi.c
index 6cc617b2940e..2e13f241538a 100644
--- a/drivers/platform/x86/toshiba_acpi.c
+++ b/drivers/platform/x86/toshiba_acpi.c
@@ -112,6 +112,7 @@ MODULE_LICENSE("GPL");
#define HCI_KBD_ILLUMINATION 0x0095
#define HCI_ECO_MODE 0x0097
#define HCI_ACCELEROMETER2 0x00a6
+#define HCI_BATTERY_CHARGE_MODE 0x00ba
#define HCI_SYSTEM_INFO 0xc000
#define SCI_PANEL_POWER_ON 0x010d
#define SCI_ILLUMINATION 0x014e
@@ -201,6 +202,7 @@ struct toshiba_acpi_dev {
unsigned int usb_three_supported:1;
unsigned int wwan_supported:1;
unsigned int cooling_method_supported:1;
+ unsigned int battery_charge_mode_supported:1;
unsigned int sysfs_created:1;
unsigned int special_functions;
@@ -1285,6 +1287,69 @@ static int toshiba_cooling_method_set(struct toshiba_acpi_dev *dev, u32 state)
return (result == TOS_SUCCESS || result == TOS_SUCCESS2) ? 0 : -EIO;
}
+/* Battery charge control */
+static void toshiba_battery_charge_mode_available(struct toshiba_acpi_dev *dev)
+{
+ u32 in[TCI_WORDS] = { HCI_GET, HCI_BATTERY_CHARGE_MODE, 0, 0, 0, 0 };
+ u32 out[TCI_WORDS];
+ acpi_status status;
+
+ dev->battery_charge_mode_supported = 0;
+
+ status = tci_raw(dev, in, out);
+ if (ACPI_FAILURE(status)) {
+ pr_err("ACPI call to get Battery Charge Mode failed\n");
+ return;
+ }
+
+ if (out[0] != TOS_SUCCESS && out[0] != TOS_SUCCESS2)
+ return;
+
+ dev->battery_charge_mode_supported = 1;
+}
+
+static int toshiba_battery_charge_mode_get(struct toshiba_acpi_dev *dev, u32 *state)
+{
+ u32 in[TCI_WORDS] = { HCI_GET, HCI_BATTERY_CHARGE_MODE, 0, 0, 0, 0x1 };
+ u32 out[TCI_WORDS];
+ int retries = 3;
+
+ do {
+ acpi_status status = tci_raw(dev, in, out);
+
+ if (ACPI_FAILURE(status))
+ pr_err("ACPI call to get Battery Charge Mode failed\n");
+ switch (out[0]) {
+ case TOS_SUCCESS:
+ case TOS_SUCCESS2:
+ *state = out[2];
+ return 0;
+ case TOS_NOT_SUPPORTED:
+ return -ENODEV;
+ case TOS_DATA_NOT_AVAILABLE:
+ retries--;
+ break;
+ default:
+ return -EIO;
+ }
+ } while (retries);
+
+ return -EIO;
+}
+
+static int toshiba_battery_charge_mode_set(struct toshiba_acpi_dev *dev, u32 state)
+{
+ u32 result = hci_write(dev, HCI_BATTERY_CHARGE_MODE, state);
+
+ if (result == TOS_FAILURE)
+ pr_err("ACPI call to set Battery Charge Mode failed\n");
+
+ if (result == TOS_NOT_SUPPORTED)
+ return -ENODEV;
+
+ return (result == TOS_SUCCESS || result == TOS_SUCCESS2) ? 0 : -EIO;
+}
+
/* Transflective Backlight */
static int get_tr_backlight_status(struct toshiba_acpi_dev *dev, u32 *status)
{
@@ -2334,6 +2399,44 @@ static ssize_t cooling_method_store(struct device *dev,
}
static DEVICE_ATTR_RW(cooling_method);
+static ssize_t battery_charge_mode_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct toshiba_acpi_dev *toshiba = dev_get_drvdata(dev);
+ int state;
+ int ret;
+
+ ret = toshiba_battery_charge_mode_get(toshiba, &state);
+ if (ret < 0)
+ return ret;
+
+ return sprintf(buf, "%d\n", state);
+}
+
+static ssize_t battery_charge_mode_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct toshiba_acpi_dev *toshiba = dev_get_drvdata(dev);
+ int state;
+ int ret;
+
+ ret = kstrtoint(buf, 0, &state);
+ if (ret)
+ return ret;
+
+ if (state != 0 && state != 1)
+ return -EINVAL;
+
+ ret = toshiba_battery_charge_mode_set(toshiba, state);
+ if (ret)
+ return ret;
+
+ return count;
+}
+static DEVICE_ATTR_RW(battery_charge_mode);
+
static struct attribute *toshiba_attributes[] = {
&dev_attr_version.attr,
&dev_attr_fan.attr,
@@ -2350,6 +2453,7 @@ static struct attribute *toshiba_attributes[] = {
&dev_attr_panel_power_on.attr,
&dev_attr_usb_three.attr,
&dev_attr_cooling_method.attr,
+ &dev_attr_battery_charge_mode.attr,
NULL,
};
@@ -2384,6 +2488,8 @@ static umode_t toshiba_sysfs_is_visible(struct kobject *kobj,
exists = (drv->usb_three_supported) ? true : false;
else if (attr == &dev_attr_cooling_method.attr)
exists = (drv->cooling_method_supported) ? true : false;
+ else if (attr == &dev_attr_battery_charge_mode.attr)
+ exists = (drv->battery_charge_mode_supported) ? true : false;
return exists ? attr->mode : 0;
}
@@ -2959,6 +3065,8 @@ static void print_supported_features(struct toshiba_acpi_dev *dev)
pr_cont(" wwan");
if (dev->cooling_method_supported)
pr_cont(" cooling-method");
+ if (dev->battery_charge_mode_supported)
+ pr_cont(" battery-charge-mode");
pr_cont("\n");
}
@@ -3166,6 +3274,8 @@ static int toshiba_acpi_add(struct acpi_device *acpi_dev)
toshiba_cooling_method_available(dev);
+ toshiba_battery_charge_mode_available(dev);
+
print_supported_features(dev);
ret = sysfs_create_group(&dev->acpi_dev->dev.kobj,
--
2.37.2
