From 97ccd7d57983475ab18f0503dd7c1df089782864 Mon Sep 17 00:00:00 2001
From: Orlando Chamberlain <orlandoch.dev@gmail.com>
Date: Mon, 30 Jan 2023 18:56:27 +1100
Subject: [PATCH] battery charge limiter

echo 50 | sudo tee /sys/bus/acpi/drivers/applesmc/APP0001:00/battery_charge_limit

etc etc. Max is 100, min is 0
---
 3009-applesmc-battery-charge-limiter.patch | 96 ++++++++++++++++++++++
 1 file changed, 96 insertions(+)
 create mode 100644 3009-applesmc-battery-charge-limiter.patch

diff --git a/3009-applesmc-battery-charge-limiter.patch b/3009-applesmc-battery-charge-limiter.patch
new file mode 100644
index 0000000..281c50f
--- /dev/null
+++ b/3009-applesmc-battery-charge-limiter.patch
@@ -0,0 +1,96 @@
+From 38786c7979c8ece013b5b7d5cb07dc2aa40198be Mon Sep 17 00:00:00 2001
+From: Orlando Chamberlain <orlandoch.dev@gmail.com>
+Date: Mon, 30 Jan 2023 18:42:21 +1100
+Subject: [PATCH 1/1] applesmc: battery charge limiter
+
+---
+ drivers/hwmon/applesmc.c | 42 +++++++++++++++++++++++++++++++++++++++-
+ 1 file changed, 41 insertions(+), 1 deletion(-)
+
+diff --git a/drivers/hwmon/applesmc.c b/drivers/hwmon/applesmc.c
+index 12be9269a314..bc1eec74cfef 100644
+--- a/drivers/hwmon/applesmc.c
++++ b/drivers/hwmon/applesmc.c
+@@ -1478,6 +1478,35 @@ 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)
+ {
+@@ -1612,6 +1641,11 @@ 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 */
+ 
+ /*
+@@ -1830,10 +1864,13 @@ 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)
+@@ -1869,6 +1906,8 @@ 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:
+@@ -1883,6 +1922,7 @@ 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);
+ }
+ 
+-- 
+2.39.1
+