[RFC] shutdown machine when li-ion battery goes below 3V
From: Pavel Machek <hidden>
Date: 2016-10-24 21:22:56
Also in:
linux-omap, lkml
Subsystem:
nokia n900 power supply drivers, power supply class/subsystem and drivers, the rest, thermal, ti bq27xxx power supply driver · Maintainers:
Sebastian Reichel, Linus Torvalds, Rafael J. Wysocki, Daniel Lezcano
Hi! What about something like this? N900 will drain the battery down to system crash, which is quite uncool. Pavel
diff --git a/drivers/power/supply/bq27xxx_battery.c b/drivers/power/supply/bq27xxx_battery.c
index 0fe278b..8eb2f8f 100644
--- a/drivers/power/supply/bq27xxx_battery.c
+++ b/drivers/power/supply/bq27xxx_battery.c@@ -46,6 +46,7 @@ #include <linux/delay.h> #include <linux/platform_device.h> #include <linux/power_supply.h> +#include <linux/reboot.h> #include <linux/slab.h> #include <linux/of.h>
@@ -740,6 +741,9 @@ void bq27xxx_battery_update(struct bq27xxx_device_info *di) } EXPORT_SYMBOL_GPL(bq27xxx_battery_update); +static int bq27xxx_battery_protect(struct bq27xxx_device_info *di); + + static void bq27xxx_battery_poll(struct work_struct *work) { struct bq27xxx_device_info *di =
@@ -747,6 +751,7 @@ static void bq27xxx_battery_poll(struct work_struct *work) work.work); bq27xxx_battery_update(di); + bq27xxx_battery_protect(di); if (poll_interval > 0) schedule_delayed_work(&di->work, poll_interval * HZ);
@@ -958,6 +963,41 @@ static int bq27xxx_battery_get_property(struct power_supply *psy, return ret; } +static int bq27xxx_battery_protect(struct bq27xxx_device_info *di) +{ + union power_supply_propval val; + int mV, mA, mOhm = 430, mVadj; + int res; + + printk(KERN_INFO "Main battery check\n"); + + res = bq27xxx_battery_voltage(di, &val); + if (res) + return res; + + mV = val.intval / 1000; + + if (mV < 2950) { + printk(KERN_ALERT "Main battery below 2.95V, forcing shutdown.\n"); + orderly_poweroff(true); + } + + res = bq27xxx_battery_current(di, &val); + if (res) + return res; + + mA = val.intval / 1000; + mVadj = mV + (mA * mOhm) / 1000; + + if (mVadj < 3150) { + printk(KERN_ALERT "Main battery internal voltage below 3.15, shutdown.\n"); + orderly_poweroff(true); + } + printk(KERN_INFO "Main battery %d mV, internal voltage %d mV\n", + mV, mVadj); + return 0; +} + static void bq27xxx_external_power_changed(struct power_supply *psy) { struct bq27xxx_device_info *di = power_supply_get_drvdata(psy);
diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c
index 226b0b4ac..bcdc1f8 100644
--- a/drivers/thermal/thermal_core.c
+++ b/drivers/thermal/thermal_core.c@@ -444,7 +444,7 @@ static void handle_critical_trips(struct thermal_zone_device *tz, if (trip_type == THERMAL_TRIP_CRITICAL) { dev_emerg(&tz->device, - "critical temperature reached(%d C),shutting down\n", + "critical temperature reached(%d C), shutting down\n", tz->temperature / 1000); orderly_poweroff(true); }
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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