applesmc-t2: battery charge limiter

Author: Redecorating

drivers/hwmon/applesmc-t2.c

@@ -1477,6 +1477,35 @@ static void applesmc_brightness_set(struct led_classdev *led_cdev,
 		dev_dbg(led_cdev->dev, "work was already on the queue.\n");
 }
 
+static ssize_t applesmc_BCLM_store(struct device *dev,
+		struct device_attribute *attr, char *sysfsbuf, size_t count)
+{
+	struct applesmc_device *smc = dev_get_drvdata(dev);
+	u8 val;
+
+	if (kstrtou8(sysfsbuf, 10, &val) < 0)
+		return -EINVAL;
+
+	if (val < 0 || val > 100)
+		return -EINVAL;
+
+	if (applesmc_write_key(smc, "BCLM", &val, 1))
+		return -ENODEV;
+	return count;
+}
+
+static ssize_t applesmc_BCLM_show(struct device *dev,
+		struct device_attribute *attr, char *sysfsbuf)
+{
+	struct applesmc_device *smc = dev_get_drvdata(dev);
+	u8 val;
+
+	if (applesmc_read_key(smc, "BCLM", &val, 1))
+		return -ENODEV;
+
+	return sysfs_emit(sysfsbuf, "%d\n", val);
+}
+
 static ssize_t applesmc_key_count_show(struct device *dev,
 				struct device_attribute *attr, char *sysfsbuf)
 {
@@ -1611,6 +1640,11 @@ static struct applesmc_node_group temp_group[] = {
 	{ }
 };
 
+static struct applesmc_node_group BCLM_group[] = {
+	{ "battery_charge_limit", applesmc_BCLM_show, applesmc_BCLM_store },
+	{ }
+};
+
 /* Module stuff */
 
 /*
@@ -1829,10 +1863,13 @@ static int applesmc_create_modules(struct applesmc_device *smc)
 	ret = applesmc_create_nodes(smc, info_group, 1);
 	if (ret)
 		goto out;
+	ret = applesmc_create_nodes(smc, BCLM_group, 1);
+	if (ret)
+		goto out_info;
 
 	ret = applesmc_create_nodes(smc, fan_group, smc->reg.fan_count);
 	if (ret)
-		goto out_info;
+		goto out_bclm;
 
 	ret = applesmc_create_nodes(smc, temp_group, smc->reg.index_count);
 	if (ret)
@@ -1868,6 +1905,8 @@ static int applesmc_create_modules(struct applesmc_device *smc)
 	applesmc_destroy_nodes(smc, temp_group);
 out_fans:
 	applesmc_destroy_nodes(smc, fan_group);
+out_bclm:
+	applesmc_destroy_nodes(smc, BCLM_group);
 out_info:
 	applesmc_destroy_nodes(smc, info_group);
 out:
@@ -1882,6 +1921,7 @@ static void applesmc_destroy_modules(struct applesmc_device *smc)
 	applesmc_release_accelerometer(smc);
 	applesmc_destroy_nodes(smc, temp_group);
 	applesmc_destroy_nodes(smc, fan_group);
+	applesmc_destroy_nodes(smc, BCLM_group);
 	applesmc_destroy_nodes(smc, info_group);
 }