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Subject[RFC] shutdown machine when li-ion battery goes below 3V
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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