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a9f6a19b57
Use wrappers over get_property() and set_property() internally in power
supply and for sysfs interface. The wrappers provide safe access if
power supply is not yet registered or t is being destroyed.
In case of syfs the theoretical race could happen between ending of
driver's probe and parallel sysfs access:
some_driver_probe() userspace
==================================== ===========================
drv->psy = power_supply_register()
device_add()
sysfs entries are created
atomic_inc(&psy->use_cnt);
store on sysfs attributes
drv->set_property()
dereference of drv->psy
drv->psy = returned psy;
For leds the race could happen between power supply being destroyed and
ongoing power_supply_changed_work().
Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Signed-off-by: Sebastian Reichel <sre@kernel.org>
171 lines
4.8 KiB
C
171 lines
4.8 KiB
C
/*
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* LEDs triggers for power supply class
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*
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* Copyright © 2007 Anton Vorontsov <cbou@mail.ru>
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* Copyright © 2004 Szabolcs Gyurko
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* Copyright © 2003 Ian Molton <spyro@f2s.com>
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*
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* Modified: 2004, Oct Szabolcs Gyurko
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*
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* You may use this code as per GPL version 2
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*/
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#include <linux/kernel.h>
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#include <linux/device.h>
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#include <linux/power_supply.h>
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#include <linux/slab.h>
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#include "power_supply.h"
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/* Battery specific LEDs triggers. */
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static void power_supply_update_bat_leds(struct power_supply *psy)
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{
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union power_supply_propval status;
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unsigned long delay_on = 0;
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unsigned long delay_off = 0;
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if (power_supply_get_property(psy, POWER_SUPPLY_PROP_STATUS, &status))
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return;
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dev_dbg(&psy->dev, "%s %d\n", __func__, status.intval);
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switch (status.intval) {
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case POWER_SUPPLY_STATUS_FULL:
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led_trigger_event(psy->charging_full_trig, LED_FULL);
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led_trigger_event(psy->charging_trig, LED_OFF);
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led_trigger_event(psy->full_trig, LED_FULL);
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led_trigger_event(psy->charging_blink_full_solid_trig,
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LED_FULL);
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break;
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case POWER_SUPPLY_STATUS_CHARGING:
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led_trigger_event(psy->charging_full_trig, LED_FULL);
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led_trigger_event(psy->charging_trig, LED_FULL);
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led_trigger_event(psy->full_trig, LED_OFF);
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led_trigger_blink(psy->charging_blink_full_solid_trig,
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&delay_on, &delay_off);
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break;
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default:
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led_trigger_event(psy->charging_full_trig, LED_OFF);
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led_trigger_event(psy->charging_trig, LED_OFF);
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led_trigger_event(psy->full_trig, LED_OFF);
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led_trigger_event(psy->charging_blink_full_solid_trig,
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LED_OFF);
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break;
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}
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}
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static int power_supply_create_bat_triggers(struct power_supply *psy)
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{
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psy->charging_full_trig_name = kasprintf(GFP_KERNEL,
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"%s-charging-or-full", psy->desc->name);
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if (!psy->charging_full_trig_name)
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goto charging_full_failed;
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psy->charging_trig_name = kasprintf(GFP_KERNEL,
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"%s-charging", psy->desc->name);
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if (!psy->charging_trig_name)
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goto charging_failed;
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psy->full_trig_name = kasprintf(GFP_KERNEL, "%s-full", psy->desc->name);
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if (!psy->full_trig_name)
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goto full_failed;
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psy->charging_blink_full_solid_trig_name = kasprintf(GFP_KERNEL,
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"%s-charging-blink-full-solid", psy->desc->name);
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if (!psy->charging_blink_full_solid_trig_name)
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goto charging_blink_full_solid_failed;
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led_trigger_register_simple(psy->charging_full_trig_name,
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&psy->charging_full_trig);
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led_trigger_register_simple(psy->charging_trig_name,
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&psy->charging_trig);
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led_trigger_register_simple(psy->full_trig_name,
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&psy->full_trig);
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led_trigger_register_simple(psy->charging_blink_full_solid_trig_name,
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&psy->charging_blink_full_solid_trig);
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return 0;
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charging_blink_full_solid_failed:
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kfree(psy->full_trig_name);
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full_failed:
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kfree(psy->charging_trig_name);
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charging_failed:
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kfree(psy->charging_full_trig_name);
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charging_full_failed:
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return -ENOMEM;
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}
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static void power_supply_remove_bat_triggers(struct power_supply *psy)
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{
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led_trigger_unregister_simple(psy->charging_full_trig);
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led_trigger_unregister_simple(psy->charging_trig);
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led_trigger_unregister_simple(psy->full_trig);
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led_trigger_unregister_simple(psy->charging_blink_full_solid_trig);
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kfree(psy->charging_blink_full_solid_trig_name);
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kfree(psy->full_trig_name);
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kfree(psy->charging_trig_name);
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kfree(psy->charging_full_trig_name);
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}
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/* Generated power specific LEDs triggers. */
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static void power_supply_update_gen_leds(struct power_supply *psy)
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{
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union power_supply_propval online;
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if (power_supply_get_property(psy, POWER_SUPPLY_PROP_ONLINE, &online))
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return;
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dev_dbg(&psy->dev, "%s %d\n", __func__, online.intval);
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if (online.intval)
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led_trigger_event(psy->online_trig, LED_FULL);
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else
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led_trigger_event(psy->online_trig, LED_OFF);
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}
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static int power_supply_create_gen_triggers(struct power_supply *psy)
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{
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psy->online_trig_name = kasprintf(GFP_KERNEL, "%s-online",
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psy->desc->name);
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if (!psy->online_trig_name)
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return -ENOMEM;
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led_trigger_register_simple(psy->online_trig_name, &psy->online_trig);
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return 0;
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}
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static void power_supply_remove_gen_triggers(struct power_supply *psy)
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{
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led_trigger_unregister_simple(psy->online_trig);
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kfree(psy->online_trig_name);
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}
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/* Choice what triggers to create&update. */
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void power_supply_update_leds(struct power_supply *psy)
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{
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if (psy->desc->type == POWER_SUPPLY_TYPE_BATTERY)
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power_supply_update_bat_leds(psy);
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else
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power_supply_update_gen_leds(psy);
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}
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int power_supply_create_triggers(struct power_supply *psy)
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{
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if (psy->desc->type == POWER_SUPPLY_TYPE_BATTERY)
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return power_supply_create_bat_triggers(psy);
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return power_supply_create_gen_triggers(psy);
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}
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void power_supply_remove_triggers(struct power_supply *psy)
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{
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if (psy->desc->type == POWER_SUPPLY_TYPE_BATTERY)
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power_supply_remove_bat_triggers(psy);
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else
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power_supply_remove_gen_triggers(psy);
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}
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