This makes it possible to forcefully discharge a battery.
Signed-off-by: Julian Andres Klode <jak@xxxxxxxxxxxxx>
---
Documentation/laptops/thinkpad-acpi.txt | 4 +++
drivers/platform/x86/thinkpad_acpi.c | 49 ++++++++++++++++++++++++++++++++-
2 files changed, 52 insertions(+), 1 deletion(-)
diff --git a/Documentation/laptops/thinkpad-acpi.txt b/Documentation/laptops/thinkpad-acpi.txt
index 97b150a..72882bb 100644
--- a/Documentation/laptops/thinkpad-acpi.txt
+++ b/Documentation/laptops/thinkpad-acpi.txt
@@ -1370,6 +1370,10 @@ battery sysfs attribute: stop_charge_thresh
A percentage value from 1-99%, controlling when charging should stop, or
0 for the default value.
+battery sysfs attribute: force_discharge
+
+ Force discharging (0 or 1)
+
Multiple Commands, Module Parameters
------------------------------------
diff --git a/drivers/platform/x86/thinkpad_acpi.c b/drivers/platform/x86/thinkpad_acpi.c
index 66e629e..67ce469 100644
--- a/drivers/platform/x86/thinkpad_acpi.c
+++ b/drivers/platform/x86/thinkpad_acpi.c
@@ -8358,7 +8358,7 @@ static struct ibm_struct fan_driver_data = {
/* Modify battery_init() if you modify them */
#define BATTERY_MAX_COUNT 3
-#define BATTERY_MAX_ATTRS 2
+#define BATTERY_MAX_ATTRS 3
static struct battery {
char name[3 + 1 + 1];
@@ -8437,6 +8437,46 @@ static ssize_t battery_stop_charge_thresh_show(struct device *dev,
return snprintf(buf, PAGE_SIZE, "%d\n", value & 0xFF);
}
+static ssize_t battery_force_discharge_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ int bat = battery_attribute_get_battery(attr);
+ int value;
+
+ if (!hkey_handle || !acpi_evalf(hkey_handle, &value, "BDSG",
+ "dd", bat))
+ return -EIO;
+
+ return snprintf(buf, PAGE_SIZE, "%d\n", value & 0x1);
+}
+
+static ssize_t battery_force_discharge_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ int bat = battery_attribute_get_battery(attr);
+ int res = -EINVAL;
+ unsigned long value;
+
+ res = kstrtoul(buf, 0, &value);
+ if (res || value > 1)
+ return res ? res : -EINVAL;
+
+ if (!hkey_handle || !acpi_evalf(hkey_handle, &res, "BDSG", "dd", bat))
+ return -EIO;
+
+ /* Keep the break on AC disconnect state */
+ value |= (res >> 1) & 0x1;
+ /* Set the battery */
+ value |= (bat << 8);
+
+ if (!hkey_handle || !acpi_evalf(hkey_handle, &res, "BDSS",
+ "dd", (int) value) || res < 0)
+ return -EIO;
+ return count;
+}
+
static int __init battery_init(struct ibm_init_struct *iibm)
{
int res;
@@ -8482,6 +8522,13 @@ static int __init battery_init(struct ibm_init_struct *iibm)
battery_stop_charge_thresh_store),
.var = (void *) (unsigned long) (i + 1)
};
+ batteries[i].attributes[j++] = (struct dev_ext_attribute) {
+ .attr = __ATTR(force_discharge,
+ S_IWUSR | S_IRUGO,
+ battery_force_discharge_show,
+ battery_force_discharge_store),
+ .var = (void *) (unsigned long) (i + 1)
+ };
strncpy(batteries[i].name, "BAT", 3);
batteries[i].name[3] = '0' + i;
--
1.8.4.2
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