joachim/argon40-battery-display
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Add supprt for automatic shutdown at 5%

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Automatically shutdown the system when the battery hits 5% left if the
system is not plugged in.  The shutdown does *not* save data, so might
want to look into how to make it save data (or possibly just generate a
warning.
This commit is contained in:
Jeff Curless
2025-10-12 23:24:15 -04:00
parent d2ef3d2ceb
commit 050f0a0147
1 changed files with 43 additions and 15 deletions
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56
battery/oneUpPower.c
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@@ -36,9 +36,9 @@ enum test_power_id {
#define DRV_NAME "oneUpPower"
#define PR_INFO( fmt, arg...) printk( KERN_INFO DRV_NAME ":" fmt, ##arg )
#define PR_ERR( fmt, arg... ) printk( KERN_ERR DRV_NAME ":" fmt, ##arg )
#define TOTAL_LIFE_SECONDS (3 * 60 * 60) // Time in seconds
#define TOTAL_LIFE_SECONDS (6 * 60 * 60) // Time in seconds
#define TOTAL_CHARGE (4800 * 1000) // Power in micro Amp Hours, uAH
#define TOTAL_CHARGE_FULL_SECONDS (60 * 60) // Time to full charge in seconds
#define TOTAL_CHARGE_FULL_SECONDS (((2*60)+30) * 60) // Time to full charge in seconds
//
@@ -87,6 +87,10 @@ static int get_ac_property(struct power_supply *psy,
enum power_supply_property psp,
union power_supply_propval *val );
//
// Globals
//
static int critical_power_level = 5; // Default setting is 5% of power left for critical
static int ac_online = 1; // Are we connected to an external power source?
static bool module_initialized = false; // Has the driver been initialized?
static struct task_struct *monitor_task = NULL; // Place to store the monito task...
@@ -168,14 +172,6 @@ static const struct power_supply_config power_configs[] = {
},
};
//
// Potentially a method to shutdown the system when the battery is really low...
//
// static const char * const shutdown_argv[] =
// { "/sbin/shutdown", "-h", "-P", "now", NULL };
// call_usermodehelper(shutdown_argv[0], shutdown_argv, NULL, UMH_NO_WAIT);
//
//
// set_power_states
//
@@ -223,7 +219,11 @@ static void set_power_states( void )
// Parameters:
// client - A i2c object that is used to get data from the I2C bus.
//
static void check_ac_power( struct i2c_client *client )
// Returns:
// True - If the system is plugged in
// False - If we are soley on battery power
//
static int check_ac_power( struct i2c_client *client )
{
int current_high;
int plugged_in;
@@ -241,6 +241,8 @@ static void check_ac_power( struct i2c_client *client )
set_power_states();
//power_supply_changed( power_supplies[ONEUP_AC] );
}
return plugged_in;
}
//
@@ -251,7 +253,10 @@ static void check_ac_power( struct i2c_client *client )
// Parameters:
// client - I2C device used to get information
//
static void check_battery_state( struct i2c_client *client )
// Returns:
// Battery State of Charge in Percentage
//
static int check_battery_state( struct i2c_client *client )
{
int SOCPercent;
@@ -264,8 +269,24 @@ static void check_battery_state( struct i2c_client *client )
if( battery.capacity != SOCPercent ){
battery.capacity = SOCPercent;
set_power_states();
PR_INFO( "Battery State of charge is %d%%\n",SOCPercent );
power_supply_changed( power_supplies[ONEUP_BATTERY] );
}
return SOCPercent;
}
//
// shutdown_helper
//
// Shutdown the system when we are critically low on power and not
// plugged in.
//
static void shutdown_helper( void ){
static char * shutdown_argv[] =
{ "/sbin/shutdown", "-h", "-P", "now", NULL };
call_usermodehelper(shutdown_argv[0], shutdown_argv, NULL, UMH_NO_WAIT);
}
//
@@ -292,6 +313,8 @@ static int system_monitor( void *args )
struct i2c_client *client = NULL;
struct i2c_adapter *adapter = NULL;
struct i2c_board_info board_info = {I2C_BOARD_INFO("argon40_battery", BATTERY_ADDR )};
int soc;
int plugged_in;
PR_INFO( "Starting system monitor...\n" );
@@ -324,10 +347,15 @@ static int system_monitor( void *args )
if( kthread_should_stop() )
break;
check_ac_power( client );
check_battery_state( client );
plugged_in = check_ac_power( client );
soc = check_battery_state( client );
set_current_state( TASK_INTERRUPTIBLE );
if( !plugged_in && (soc <= critical_power_level) ){
// not pluggged in and below critical state, shutdown.
PR_INFO( "Performing system shutdown unplugged and power is at %d\n",soc);
shutdown_helper();
}
schedule_timeout( HZ );
}