From 3e77986a22550a8df84d9e78ddbc281488bf1120 Mon Sep 17 00:00:00 2001 From: Paul Fertser Date: Fri, 23 Oct 2009 01:49:10 +0400 Subject: [PATCH 40/69] power: implement platform battery driver 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. Signed-off-by: Paul Fertser --- drivers/power/Kconfig | 6 ++ drivers/power/Makefile | 1 + drivers/power/platform_battery.c | 120 ++++++++++++++++++++++++++++++++++++++ include/linux/platform_battery.h | 12 ++++ 4 files changed, 139 insertions(+), 0 deletions(-) create mode 100644 drivers/power/platform_battery.c create mode 100644 include/linux/platform_battery.h diff --git a/drivers/power/Kconfig b/drivers/power/Kconfig index 52a462f..985f350 100644 --- a/drivers/power/Kconfig +++ b/drivers/power/Kconfig @@ -14,6 +14,12 @@ config POWER_SUPPLY_DEBUG Say Y here to enable debugging messages for power supply class and drivers. +config BATTERY_PLATFORM + tristate "Platform battery driver" + help + Say Y here to include support for battery driver that gets all + information from platform functions. + config PDA_POWER tristate "Generic PDA/phone power driver" depends on !S390 diff --git a/drivers/power/Makefile b/drivers/power/Makefile index 8385bfa..59530ee 100644 --- a/drivers/power/Makefile +++ b/drivers/power/Makefile @@ -14,6 +14,7 @@ obj-$(CONFIG_WM831X_POWER) += wm831x_power.o obj-$(CONFIG_WM8350_POWER) += wm8350_power.o obj-$(CONFIG_TEST_POWER) += test_power.o +obj-$(CONFIG_BATTERY_PLATFORM) += platform_battery.o obj-$(CONFIG_BATTERY_DS2760) += ds2760_battery.o obj-$(CONFIG_BATTERY_DS2782) += ds2782_battery.o obj-$(CONFIG_BATTERY_PMU) += pmu_battery.o diff --git a/drivers/power/platform_battery.c b/drivers/power/platform_battery.c new file mode 100644 index 0000000..a5c9f35 --- /dev/null +++ b/drivers/power/platform_battery.c @@ -0,0 +1,120 @@ +/* + * Driver for platform battery + * + * Copyright (c) Paul Fertser + * Inspired by Balaji Rao + * + * 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 +#include +#include +#include +#include + +#include +#include + +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 "); +MODULE_DESCRIPTION("platform battery driver"); diff --git a/include/linux/platform_battery.h b/include/linux/platform_battery.h new file mode 100644 index 0000000..00f7651 --- /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 -- 1.7.2.5