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Date: Mon, 25 Sep 2017 10:18:11 +0200
From: Pavel Machek <pavel@....cz>
To: pali.rohar@...il.com, sre@...nel.org,
kernel list <linux-kernel@...r.kernel.org>,
linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
linux-omap@...r.kernel.org, tony@...mide.com, khilman@...nel.org,
aaro.koskinen@....fi, ivo.g.dimitrov.75@...il.com,
patrikbachan@...il.com, serge@...lyn.com, abcloriens@...il.com,
clayton@...ftyguy.net, martijn@...xit.nl,
sakari.ailus@...ux.intel.com
Subject: bq27xxx: add battery protection
Add battery protection for bq27xxx. Note that thresholds are very low,
so this only kills system long after reasonable userspace should have
reacted.
Signed-off-by: Pavel Machek <pavel@....cz>
diff --git a/drivers/power/supply/bq27xxx_battery.c b/drivers/power/supply/bq27xxx_battery.c
index 51f0961..08dc193 100644
--- a/drivers/power/supply/bq27xxx_battery.c
+++ b/drivers/power/supply/bq27xxx_battery.c
@@ -53,6 +53,7 @@
#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>
@@ -1580,6 +1577,56 @@ void bq27xxx_battery_update(struct bq27xxx_device_info *di)
}
EXPORT_SYMBOL_GPL(bq27xxx_battery_update);
+static void shutdown(char *reason)
+{
+ pr_alert("Forcing shutdown: %s\n", reason);
+ orderly_poweroff(true);
+}
+
+static int generic_protect(struct power_supply *psy)
+{
+ union power_supply_propval val;
+ int res;
+ int mV, mA, mVadj = 0;
+ const int mOhm = 430;
+ const int mV_limit = 2950;
+ const int mV_open_limit = 3150;
+
+ res = psy->desc->get_property(psy, POWER_SUPPLY_PROP_HEALTH, &val);
+ if (res)
+ return res;
+
+ if (val.intval == POWER_SUPPLY_HEALTH_OVERHEAT)
+ shutdown("Battery overheat.");
+ if (val.intval == POWER_SUPPLY_HEALTH_DEAD)
+ shutdown("Battery dead.");
+
+ res = psy->desc->get_property(psy, POWER_SUPPLY_PROP_VOLTAGE_NOW, &val);
+ if (res)
+ return res;
+ mV = val.intval / 1000;
+
+ if (mV < mV_limit) {
+ pr_alert("Battery below %d mV.", mV_limit);
+ orderly_poweroff(true);
+ }
+
+ res = psy->desc->get_property(psy, POWER_SUPPLY_PROP_CURRENT_NOW, &val);
+ if (res)
+ return res;
+ mA = val.intval / 1000;
+ mVadj = mV + (mA * mOhm) / 1000;
+
+ if (mVadj < mV_open_limit) {
+ pr_alert("Battery open circuit voltage below %d mV.", mV_open_limit);
+ orderly_poweroff(true);
+ }
+
+ printk(KERN_INFO "Main battery %d mV, open circuit voltage %d mV\n",
+ mV, mVadj);
+ return 0;
+}
+
static void bq27xxx_battery_poll(struct work_struct *work)
{
struct bq27xxx_device_info *di =
@@ -1592,6 +1639,16 @@ static void bq27xxx_battery_poll(struct work_struct *work)
schedule_delayed_work(&di->work, poll_interval * HZ);
}
+static void bq27xxx_battery_poll_protect(struct work_struct *work)
+{
+ struct bq27xxx_device_info *di =
+ container_of(work, struct bq27xxx_device_info,
+ work.work);
+
+ bq27xxx_battery_poll(work);
+ generic_protect(di->bat);
+}
+
/*
* Return the battery average current in µA
* Note that current can be negative signed as well
@@ -1684,8 +1741,8 @@ static int bq27xxx_battery_capacity_level(struct bq27xxx_device_info *di,
}
/*
- * Return the battery Voltage in millivolts
- * Or < 0 if something fails.
+ * Set val->intval to the battery Voltage in millivolts.
+ * Return < 0 if something fails.
*/
static int bq27xxx_battery_voltage(struct bq27xxx_device_info *di,
union power_supply_propval *val)
@@ -1821,7 +1878,7 @@ int bq27xxx_battery_setup(struct bq27xxx_device_info *di)
.drv_data = di,
};
- INIT_DELAYED_WORK(&di->work, bq27xxx_battery_poll);
+ INIT_DELAYED_WORK(&di->work, bq27xxx_battery_poll_protect);
mutex_init(&di->lock);
di->regs = bq27xxx_chip_data[di->chip].regs;
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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