diff options
Diffstat (limited to 'drivers/power/platform_battery.c')
| -rw-r--r-- | drivers/power/platform_battery.c | 120 |
1 files changed, 120 insertions, 0 deletions
diff --git a/drivers/power/platform_battery.c b/drivers/power/platform_battery.c new file mode 100644 index 00000000000..a5c9f35c699 --- /dev/null +++ b/drivers/power/platform_battery.c @@ -0,0 +1,120 @@ +/* + * Driver for platform battery + * + * Copyright (c) Paul Fertser <fercerpav@gmail.com> + * Inspired by Balaji Rao <balajirrao@openmoko.org> + * + * This driver can be used for dumb batteries when all knowledge about + * their state belongs to the platform that does necessary ADC readings, + * conversions, guessimations etc. + * + * Use consistent with the GNU GPL is permitted, provided that this + * copyright notice is preserved in its entirety in all copies and derived + * works. + */ + +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/power_supply.h> +#include <linux/slab.h> +#include <linux/workqueue.h> + +#include <linux/delay.h> +#include <linux/platform_battery.h> + +struct platform_battery { + struct power_supply psy; + struct platform_bat_platform_data *pdata; +}; + +static int platform_bat_get_property(struct power_supply *psy, + enum power_supply_property psp, + union power_supply_propval *val) +{ + struct platform_battery *bat = + container_of(psy, struct platform_battery, psy); + size_t i; + int present=1; + + if (bat->pdata->is_present) + present = bat->pdata->is_present(); + + if (psp != POWER_SUPPLY_PROP_PRESENT && !present) + return -ENODEV; + + for (i = 0; i < psy->num_properties; i++) + if (psy->properties[i] == psp) { + val->intval = bat->pdata->get_property[i](); + return 0; + } + + return -EINVAL; +} + +static void platform_bat_ext_changed(struct power_supply *psy) +{ + struct platform_battery *bat = + container_of(psy, struct platform_battery, psy); + power_supply_changed(&bat->psy); +} + +static int platform_battery_probe(struct platform_device *pdev) +{ + struct platform_battery *platform_bat; + struct platform_bat_platform_data *pdata = + (struct platform_bat_platform_data *)pdev->dev.platform_data; + + platform_bat = kzalloc(sizeof(*platform_bat), GFP_KERNEL); + if (!platform_bat) + return -ENOMEM; + + if (pdata->name) + platform_bat->psy.name = pdata->name; + else + platform_bat->psy.name = dev_name(&pdev->dev); + platform_bat->psy.type = POWER_SUPPLY_TYPE_BATTERY; + platform_bat->psy.properties = pdata->properties; + platform_bat->psy.num_properties = pdata->num_properties; + platform_bat->psy.get_property = platform_bat_get_property; + platform_bat->psy.external_power_changed = platform_bat_ext_changed; + + platform_bat->pdata = pdata; + platform_set_drvdata(pdev, platform_bat); + power_supply_register(&pdev->dev, &platform_bat->psy); + + return 0; +} + +static int platform_battery_remove(struct platform_device *pdev) +{ + struct platform_battery *bat = platform_get_drvdata(pdev); + + power_supply_unregister(&bat->psy); + kfree(bat); + + return 0; +} + +static struct platform_driver platform_battery_driver = { + .driver = { + .name = "platform_battery", + }, + .probe = platform_battery_probe, + .remove = platform_battery_remove, +}; + +static int __init platform_battery_init(void) +{ + return platform_driver_register(&platform_battery_driver); +} +module_init(platform_battery_init); + +static void __exit platform_battery_exit(void) +{ + platform_driver_unregister(&platform_battery_driver); +} +module_exit(platform_battery_exit); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Paul Fertser <fercerpav@gmail.com>"); +MODULE_DESCRIPTION("platform battery driver"); |