From 7784102e184c134eaa11b5986f31c892748f1604 Mon Sep 17 00:00:00 2001

From: Masashi YOKOTA yokota@pylone.jp Date: Sat, 19 Feb 2011 02:40:56 +0900 Subject: [PATCH 1/2] Add virtual battery driver

This patch adds virtual battery driver. This is based on git://git.linaro.org/people/jstultz/linux.git dev/linaro.android

Signed-off-by: Akihiro MAEDA sola.1980.a@gmail.com --- drivers/power/Kconfig | 5 + drivers/power/Makefile | 1 + drivers/power/virtual_battery.c | 349 +++++++++++++++++++++++++++++++++++++++ 3 files changed, 355 insertions(+), 0 deletions(-) create mode 100644 drivers/power/virtual_battery.c

diff --git a/drivers/power/Kconfig b/drivers/power/Kconfig index 60d83d9..7258bc9 100644 --- a/drivers/power/Kconfig +++ b/drivers/power/Kconfig @@ -185,4 +185,9 @@ config CHARGER_TWL4030 help Say Y here to enable support for TWL4030 Battery Charge Interface.

+config BATTERY_VIRTUAL + tristate "Virtual Battery Driver" + help + Say Y to include support for Virtual Battery. + endif # POWER_SUPPLY diff --git a/drivers/power/Makefile b/drivers/power/Makefile index c75772e..71f8b36 100644 --- a/drivers/power/Makefile +++ b/drivers/power/Makefile @@ -32,3 +32,4 @@ obj-$(CONFIG_BATTERY_JZ4740) += jz4740-battery.o obj-$(CONFIG_BATTERY_INTEL_MID) += intel_mid_battery.o obj-$(CONFIG_CHARGER_ISP1704) += isp1704_charger.o obj-$(CONFIG_CHARGER_TWL4030) += twl4030_charger.o +obj-$(CONFIG_BATTERY_VIRTUAL) += virtual_battery.o diff --git a/drivers/power/virtual_battery.c b/drivers/power/virtual_battery.c new file mode 100644 index 0000000..9e455ad --- /dev/null +++ b/drivers/power/virtual_battery.c @@ -0,0 +1,349 @@ +/* + * drivers/power/virtual_battery.c + * + * Virtual battery driver + * + * Copyright (C) 2008 Pylone, Inc. + * Author: Masashi YOKOTA yokota@pylone.jp + * + * This software is licensed under the terms of the GNU General Public + * License version 2, as published by the Free Software Foundation, and + * may be copied, distributed, and modified under those terms. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#include <linux/module.h> +#include <linux/moduleparam.h> +#include <linux/kernel.h> +#include <linux/types.h> +#include <linux/err.h> +#include <linux/string.h> +#include <linux/device.h> +#include <linux/platform_device.h> +#include <linux/power_supply.h> + + +/* module parameters */ +static int ac_status = 1; /* online */ +static int battery_status = POWER_SUPPLY_STATUS_CHARGING; +static int battery_health = POWER_SUPPLY_HEALTH_GOOD; +static int battery_present = 1; /* true */ +static int battery_technology = POWER_SUPPLY_TECHNOLOGY_LION; +static int battery_capacity = 50; + + +static struct platform_device *bat_pdev; + +static enum power_supply_property virtual_ac_props[] = { + POWER_SUPPLY_PROP_ONLINE, +}; + +static enum power_supply_property virtual_battery_props[] = { + POWER_SUPPLY_PROP_STATUS, + POWER_SUPPLY_PROP_HEALTH, + POWER_SUPPLY_PROP_PRESENT, + POWER_SUPPLY_PROP_TECHNOLOGY, + POWER_SUPPLY_PROP_CAPACITY, +}; + +static int virtual_ac_get_property(struct power_supply *psy, + enum power_supply_property psp, + union power_supply_propval *val) +{ + int ret = 0; + + dev_dbg(&bat_pdev->dev, "%s: psp=%d\n", __func__, psp); + switch (psp) { + case POWER_SUPPLY_PROP_ONLINE: + val->intval = ac_status; + break; + default: + ret = -EINVAL; + break; + } + return ret; +} + +static int virtual_battery_get_property(struct power_supply *psy, + enum power_supply_property psp, + union power_supply_propval *val) +{ + int ret = 0; + + dev_dbg(&bat_pdev->dev, "%s: psp=%d\n", __func__, psp); + switch (psp) { + case POWER_SUPPLY_PROP_STATUS: + val->intval = battery_status; + break; + case POWER_SUPPLY_PROP_HEALTH: + val->intval = battery_health; + break; + case POWER_SUPPLY_PROP_PRESENT: + val->intval = battery_present; + break; + case POWER_SUPPLY_PROP_TECHNOLOGY: + val->intval = battery_technology; + break; + case POWER_SUPPLY_PROP_CAPACITY: + val->intval = battery_capacity; + break; default: ret = -EINVAL; + break; + } + + return ret; +} + +static struct power_supply power_supply_ac = { + .properties = virtual_ac_props, + .num_properties = ARRAY_SIZE(virtual_ac_props), + .get_property = virtual_ac_get_property, + .name = "ac", + .type = POWER_SUPPLY_TYPE_MAINS, +}; + +static struct power_supply power_supply_bat = { + .properties = virtual_battery_props, + .num_properties = ARRAY_SIZE(virtual_battery_props), + .get_property = virtual_battery_get_property, + .name = "battery", + .type = POWER_SUPPLY_TYPE_BATTERY, +}; + + +struct battery_property_map { + int value; + char const * key; +}; + +static struct battery_property_map map_ac_online[] = { + { 0, "on" }, + { 1, "off" }, + { -1, NULL }, +}; + +static struct battery_property_map map_status[] = { + { POWER_SUPPLY_STATUS_CHARGING, "charging" }, + { POWER_SUPPLY_STATUS_DISCHARGING, "discharging" }, + { POWER_SUPPLY_STATUS_NOT_CHARGING, "not-charging" }, + { POWER_SUPPLY_STATUS_FULL, "full" }, + { -1, NULL }, +}; + +static struct battery_property_map map_health[] = { + { POWER_SUPPLY_HEALTH_GOOD, "good" }, + { POWER_SUPPLY_HEALTH_OVERHEAT, "overheat" }, + { POWER_SUPPLY_HEALTH_DEAD, "dead" }, + { POWER_SUPPLY_HEALTH_OVERVOLTAGE, "overvoltage" }, + { POWER_SUPPLY_HEALTH_UNSPEC_FAILURE, "failure" }, + { -1, NULL }, +}; + +static struct battery_property_map map_present[] = { + { 0, "false" }, + { 1, "true" }, + { -1, NULL }, +}; + +static struct battery_property_map map_technology[] = { + { POWER_SUPPLY_TECHNOLOGY_NiMH, "NiMH" }, + { POWER_SUPPLY_TECHNOLOGY_LION, "LION" }, + { POWER_SUPPLY_TECHNOLOGY_LIPO, "LIPO" }, + { POWER_SUPPLY_TECHNOLOGY_LiFe, "LiFe" }, + { POWER_SUPPLY_TECHNOLOGY_NiCd, "NiCd" }, + { POWER_SUPPLY_TECHNOLOGY_LiMn, "LiMn" }, + { -1, NULL }, +}; + + +static int map_get_value(struct battery_property_map * map, const char * key, int def_val) +{ + char buf[4096]; + int cr; + + strcpy(buf, key); + cr = strlen(buf) - 1; + if (buf[cr] == '\n') + buf[cr] = '\0'; + + while (map->key) { + if (strcasecmp(map->key, buf) == 0) + return map->value; + map++; + } + + return def_val; +} + + +static const char * map_get_key(struct battery_property_map * map, int value, const char * def_key) +{ + while (map->key) { + if (map->value == value) + return map->key; + map++; + } + + return def_key; +} + +static int param_set_ac_status(const char *key, struct kernel_param *kp) +{ + dev_dbg(&bat_pdev->dev, "%s: name=%s, key=%s\n", __func__, kp->name, key); + ac_status = map_get_value( map_ac_online, key, ac_status); + power_supply_changed(&power_supply_ac); + return 0; +} + +static int param_get_ac_status(char *buffer, struct kernel_param *kp) +{ + dev_dbg(&bat_pdev->dev, "%s: name=%s\n", __func__, kp->name); + strcpy(buffer, map_get_key( map_ac_online, ac_status, "unknown")); + return strlen(buffer); +} + +static int param_set_battery_status(const char *key, struct kernel_param *kp) +{ + dev_dbg(&bat_pdev->dev, "%s: name=%s, key=%s.\n", __func__, kp->name, key); + battery_status = map_get_value( map_status, key, battery_status); + power_supply_changed(&power_supply_bat); + return 0; +} + +static int param_get_battery_status(char *buffer, struct kernel_param *kp) +{ + dev_dbg(&bat_pdev->dev, "%s: name=%s\n", __func__, kp->name); + strcpy(buffer, map_get_key( map_status, battery_status, "unknown")); + return strlen(buffer); +} + +static int param_set_battery_health(const char *key, struct kernel_param *kp) +{ + dev_dbg(&bat_pdev->dev, "%s: name=%s, key=%s\n", __func__, kp->name, key); + battery_health = map_get_value( map_health, key, battery_health); + power_supply_changed(&power_supply_bat); + return 0; +} + +static int param_get_battery_health(char *buffer, struct kernel_param *kp) +{ + dev_dbg(&bat_pdev->dev, "%s: name=%s\n", __func__, kp->name); + strcpy(buffer, map_get_key( map_health, battery_health, "unknown")); + return strlen(buffer); +} + +static int param_set_battery_present(const char *key, struct kernel_param *kp) +{ + dev_dbg(&bat_pdev->dev, "%s: name=%s, key=%s\n", __func__, kp->name, key); + battery_present = map_get_value( map_present, key, battery_present); + power_supply_changed(&power_supply_ac); + return 0; +} + +static int param_get_battery_present(char *buffer, struct kernel_param *kp) +{ + dev_dbg(&bat_pdev->dev, "%s: name=%s\n", __func__, kp->name); + strcpy(buffer, map_get_key( map_present, battery_present, "unknown")); + return strlen(buffer); +} + +static int param_set_battery_technology(const char *key, struct kernel_param *kp) +{ + dev_dbg(&bat_pdev->dev, "%s: name=%s, key=%s\n", __func__, kp->name, key); + battery_technology = map_get_value( map_technology, key, battery_technology); + power_supply_changed(&power_supply_bat); + return 0; +} + +static int param_get_battery_technology(char *buffer, struct kernel_param *kp) +{ + dev_dbg(&bat_pdev->dev, "%s: name=%s\n", __func__, kp->name); + strcpy(buffer, map_get_key( map_technology, battery_technology, "unknown")); + return strlen(buffer); +} + +static int param_set_battery_capacity(const char *key, struct kernel_param *kp) +{ + int tmp; + + dev_dbg(&bat_pdev->dev, "%s: name=%s, key=%s\n", __func__, kp->name, key); + + if (1 != sscanf(key, "%d", &tmp)) + return -EINVAL; + + battery_capacity = tmp; + power_supply_changed(&power_supply_bat); + return 0; +} + +#define param_get_battery_capacity param_get_int + +static int __init virtual_battery_init(void) +{ + int ret; + + bat_pdev = platform_device_register_simple(KBUILD_BASENAME, 0, NULL, 0); + if (IS_ERR(bat_pdev)) + return PTR_ERR(bat_pdev); + + ret = power_supply_register(&bat_pdev->dev, &power_supply_ac); + if (ret) + goto err_battery_failed; + + ret = power_supply_register(&bat_pdev->dev, &power_supply_bat); + if (ret) + goto err_ac_failed; + + printk(KERN_INFO KBUILD_BASENAME": registered \n"); + return 0; + + err_battery_failed: + power_supply_unregister(&power_supply_ac); + err_ac_failed: + return ret; +} + +static void __exit virtual_battery_exit(void) +{ + power_supply_unregister(&power_supply_ac); + power_supply_unregister(&power_supply_bat); + platform_device_unregister(bat_pdev); + printk(KERN_INFO KBUILD_BASENAME": unregistered \n"); +} + +module_init(virtual_battery_init); +module_exit(virtual_battery_exit); + +#define param_check_ac_status(name, p) __param_check(name, p, void); +#define param_check_battery_status(name, p) __param_check(name, p, void); +#define param_check_battery_present(name, p) __param_check(name, p, void); +#define param_check_battery_technology(name, p) __param_check(name, p, void); +#define param_check_battery_health(name, p) __param_check(name, p, void); +#define param_check_battery_capacity(name, p) __param_check(name, p, void); + +module_param(ac_status, ac_status, 0644); +MODULE_PARM_DESC(ac_status, "AC charging state <on|off>"); + +module_param(battery_status, battery_status, 0644); +MODULE_PARM_DESC(battery_status, "battery status <charging|discharging|not-charging|full>"); + +module_param(battery_present, battery_present, 0644); +MODULE_PARM_DESC(battery_present, "battery presence state <good|overheat|dead|overvoltage|failure>"); + +module_param(battery_technology, battery_technology, 0644); +MODULE_PARM_DESC(battery_technology, "battery technology <NiMH|LION|LIPO|LiFe|NiCd|LiMn>"); + +module_param(battery_health, battery_health, 0644); +MODULE_PARM_DESC(battery_health, "battery health state <good|overheat|dead|overvoltage|failure>"); + +module_param(battery_capacity, battery_capacity, 0644); +MODULE_PARM_DESC(battery_capacity, "battery capacity (percentage)"); + + +MODULE_AUTHOR("Masashi YOKOTA yokota@pylone.jp"); +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("Virtual battery driver"); +MODULE_ALIAS("platform:"KBUILD_BASENAME);