diff options
| -rw-r--r-- | drivers/power/Kconfig | 6 | ||||
| -rw-r--r-- | drivers/power/Makefile | 1 | ||||
| -rw-r--r-- | drivers/power/platform_battery.c | 119 | ||||
| -rw-r--r-- | include/linux/platform_battery.h | 12 |
4 files changed, 138 insertions, 0 deletions
diff --git a/drivers/power/Kconfig b/drivers/power/Kconfig index 9f6a8275e12..7cd71fcb0cc 100644 --- a/drivers/power/Kconfig +++ b/drivers/power/Kconfig @@ -121,5 +121,11 @@ config HDQ_GPIO_BITBANG Say Y to enable supoort for generic gpio based HDQ bitbang driver. This can not be built as a module. +config BATTERY_PLATFORM + tristate "Platform battery driver" + help + Say Y here to include support for battery driver that gets all + information from platform functions. + endif # POWER_SUPPLY diff --git a/drivers/power/Makefile b/drivers/power/Makefile index 225abe32627..47f57ffef19 100644 --- a/drivers/power/Makefile +++ b/drivers/power/Makefile @@ -32,3 +32,4 @@ obj-$(CONFIG_CHARGER_PCF50633) += pcf50633-charger.o obj-$(CONFIG_BATTERY_BQ27000_HDQ) += bq27000_battery.o obj-$(CONFIG_HDQ_GPIO_BITBANG) += hdq.o +obj-$(CONFIG_BATTERY_PLATFORM) += platform_battery.o diff --git a/drivers/power/platform_battery.c b/drivers/power/platform_battery.c new file mode 100644 index 00000000000..99e155a2057 --- /dev/null +++ b/drivers/power/platform_battery.c @@ -0,0 +1,119 @@ +/* + * 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/param.h> +#include <linux/delay.h> +#include <linux/workqueue.h> +#include <linux/platform_device.h> +#include <linux/power_supply.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"); diff --git a/include/linux/platform_battery.h b/include/linux/platform_battery.h new file mode 100644 index 00000000000..00f7651096a --- /dev/null +++ b/include/linux/platform_battery.h @@ -0,0 +1,12 @@ +#ifndef __PLATFORM_BATTERY_H__ +#define __PLATFORM_BATTERY_H__ + +struct platform_bat_platform_data { + const char *name; + int (**get_property)(void); + int (*is_present)(void); + enum power_supply_property *properties; + size_t num_properties; +}; + +#endif |