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battery charge limiter

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

etc etc. Max is 100, min is 0
This commit is contained in:
Orlando Chamberlain
2023-01-30 18:56:27 +11:00
committed by Aditya Garg
parent 8c6eb2ecff
commit 97ccd7d579
1 changed files with 96 additions and 0 deletions
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3009-applesmc-battery-charge-limiter.patch
+96
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@@ -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