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power: Make test_power driver more dynamic.
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In 2008 Masashi YOKOTA <yokota@pylone.jp> created the virtual
battery driver found here:
http://downloads.pylone.jp/src/virtual_battery/virtual_battery-0.0.1.tar.bz2

It found use out of tree, but was never merged upstream.
Since then the test_power driver has been merged, which provides
very similar functionality.

This patch extends the test_power driver to be more dynamic
at runtime, by merging portions of the Virtual Battery Driver
by Masashi YOKOTA.

With this patch, I can tweak the values in:
/sys/module/test_power/parameters/* and watch the behavior of
the gnome power managment daemon or other battery UI software.

CC: Anton Vorontsov <cbouatmailru@gmail.com>
CC: Akihiro MAEDA <sola.1980.a@gmail.com>
CC: Masashi YOKOTA <yokota@pylone.jp>
Signed-off-by: John Stultz <john.stultz@linaro.org>
Signed-off-by: Anton Vorontsov <cbouatmailru@gmail.com>
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John Stultz authored and Anton Vorontsov committed May 20, 2011
1 parent 73c244a commit f17ef9b
Showing 1 changed file with 266 additions and 10 deletions.
276 changes: 266 additions & 10 deletions drivers/power/test_power.c
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Original file line number Diff line number Diff line change
Expand Up @@ -3,6 +3,12 @@
*
* Copyright 2010 Anton Vorontsov <cbouatmailru@gmail.com>
*
* Dynamic module parameter code from the Virtual Battery Driver
* Copyright (C) 2008 Pylone, Inc.
* By: Masashi YOKOTA <yokota@pylone.jp>
* Originally found here:
* http://downloads.pylone.jp/src/virtual_battery/virtual_battery-0.0.1.tar.bz2
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
Expand All @@ -15,16 +21,20 @@
#include <linux/delay.h>
#include <linux/vermagic.h>

static int test_power_ac_online = 1;
static int test_power_battery_status = POWER_SUPPLY_STATUS_CHARGING;
static int ac_online = 1;
static int battery_status = POWER_SUPPLY_STATUS_DISCHARGING;
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 int test_power_get_ac_property(struct power_supply *psy,
enum power_supply_property psp,
union power_supply_propval *val)
{
switch (psp) {
case POWER_SUPPLY_PROP_ONLINE:
val->intval = test_power_ac_online;
val->intval = ac_online;
break;
default:
return -EINVAL;
Expand All @@ -47,22 +57,30 @@ static int test_power_get_battery_property(struct power_supply *psy,
val->strval = UTS_RELEASE;
break;
case POWER_SUPPLY_PROP_STATUS:
val->intval = test_power_battery_status;
val->intval = battery_status;
break;
case POWER_SUPPLY_PROP_CHARGE_TYPE:
val->intval = POWER_SUPPLY_CHARGE_TYPE_FAST;
break;
case POWER_SUPPLY_PROP_HEALTH:
val->intval = POWER_SUPPLY_HEALTH_GOOD;
val->intval = battery_health;
break;
case POWER_SUPPLY_PROP_PRESENT:
val->intval = battery_present;
break;
case POWER_SUPPLY_PROP_TECHNOLOGY:
val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
val->intval = battery_technology;
break;
case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
val->intval = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
break;
case POWER_SUPPLY_PROP_CAPACITY:
val->intval = 50;
case POWER_SUPPLY_PROP_CHARGE_NOW:
val->intval = battery_capacity;
break;
case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
case POWER_SUPPLY_PROP_CHARGE_FULL:
val->intval = 100;
break;
case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG:
case POWER_SUPPLY_PROP_TIME_TO_FULL_NOW:
Expand All @@ -84,9 +102,11 @@ static enum power_supply_property test_power_battery_props[] = {
POWER_SUPPLY_PROP_STATUS,
POWER_SUPPLY_PROP_CHARGE_TYPE,
POWER_SUPPLY_PROP_HEALTH,
POWER_SUPPLY_PROP_PRESENT,
POWER_SUPPLY_PROP_TECHNOLOGY,
POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
POWER_SUPPLY_PROP_CHARGE_FULL,
POWER_SUPPLY_PROP_CHARGE_EMPTY,
POWER_SUPPLY_PROP_CHARGE_NOW,
POWER_SUPPLY_PROP_CAPACITY,
POWER_SUPPLY_PROP_CAPACITY_LEVEL,
POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG,
Expand Down Expand Up @@ -118,6 +138,7 @@ static struct power_supply test_power_supplies[] = {
},
};


static int __init test_power_init(void)
{
int i;
Expand Down Expand Up @@ -145,8 +166,8 @@ static void __exit test_power_exit(void)
int i;

/* Let's see how we handle changes... */
test_power_ac_online = 0;
test_power_battery_status = POWER_SUPPLY_STATUS_DISCHARGING;
ac_online = 0;
battery_status = POWER_SUPPLY_STATUS_DISCHARGING;
for (i = 0; i < ARRAY_SIZE(test_power_supplies); i++)
power_supply_changed(&test_power_supplies[i]);
pr_info("%s: 'changed' event sent, sleeping for 10 seconds...\n",
Expand All @@ -158,6 +179,241 @@ static void __exit test_power_exit(void)
}
module_exit(test_power_exit);



#define MAX_KEYLENGTH 256
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[MAX_KEYLENGTH];
int cr;

strncpy(buf, key, MAX_KEYLENGTH);
buf[MAX_KEYLENGTH-1] = '\0';

cr = strnlen(buf, MAX_KEYLENGTH) - 1;
if (buf[cr] == '\n')
buf[cr] = '\0';

while (map->key) {
if (strncasecmp(map->key, buf, MAX_KEYLENGTH) == 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_online(const char *key, const struct kernel_param *kp)
{
ac_online = map_get_value(map_ac_online, key, ac_online);
power_supply_changed(&test_power_supplies[0]);
return 0;
}

static int param_get_ac_online(char *buffer, const struct kernel_param *kp)
{
strcpy(buffer, map_get_key(map_ac_online, ac_online, "unknown"));
return strlen(buffer);
}

static int param_set_battery_status(const char *key,
const struct kernel_param *kp)
{
battery_status = map_get_value(map_status, key, battery_status);
power_supply_changed(&test_power_supplies[1]);
return 0;
}

static int param_get_battery_status(char *buffer, const struct kernel_param *kp)
{
strcpy(buffer, map_get_key(map_status, battery_status, "unknown"));
return strlen(buffer);
}

static int param_set_battery_health(const char *key,
const struct kernel_param *kp)
{
battery_health = map_get_value(map_health, key, battery_health);
power_supply_changed(&test_power_supplies[1]);
return 0;
}

static int param_get_battery_health(char *buffer, const struct kernel_param *kp)
{
strcpy(buffer, map_get_key(map_health, battery_health, "unknown"));
return strlen(buffer);
}

static int param_set_battery_present(const char *key,
const struct kernel_param *kp)
{
battery_present = map_get_value(map_present, key, battery_present);
power_supply_changed(&test_power_supplies[0]);
return 0;
}

static int param_get_battery_present(char *buffer,
const struct kernel_param *kp)
{
strcpy(buffer, map_get_key(map_present, battery_present, "unknown"));
return strlen(buffer);
}

static int param_set_battery_technology(const char *key,
const struct kernel_param *kp)
{
battery_technology = map_get_value(map_technology, key,
battery_technology);
power_supply_changed(&test_power_supplies[1]);
return 0;
}

static int param_get_battery_technology(char *buffer,
const struct kernel_param *kp)
{
strcpy(buffer,
map_get_key(map_technology, battery_technology, "unknown"));
return strlen(buffer);
}

static int param_set_battery_capacity(const char *key,
const struct kernel_param *kp)
{
int tmp;

if (1 != sscanf(key, "%d", &tmp))
return -EINVAL;

battery_capacity = tmp;
power_supply_changed(&test_power_supplies[1]);
return 0;
}

#define param_get_battery_capacity param_get_int



static struct kernel_param_ops param_ops_ac_online = {
.set = param_set_ac_online,
.get = param_get_ac_online,
};

static struct kernel_param_ops param_ops_battery_status = {
.set = param_set_battery_status,
.get = param_get_battery_status,
};

static struct kernel_param_ops param_ops_battery_present = {
.set = param_set_battery_present,
.get = param_get_battery_present,
};

static struct kernel_param_ops param_ops_battery_technology = {
.set = param_set_battery_technology,
.get = param_get_battery_technology,
};

static struct kernel_param_ops param_ops_battery_health = {
.set = param_set_battery_health,
.get = param_get_battery_health,
};

static struct kernel_param_ops param_ops_battery_capacity = {
.set = param_set_battery_capacity,
.get = param_get_battery_capacity,
};


#define param_check_ac_online(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_online, ac_online, 0644);
MODULE_PARM_DESC(ac_online, "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_DESCRIPTION("Power supply driver for testing");
MODULE_AUTHOR("Anton Vorontsov <cbouatmailru@gmail.com>");
MODULE_LICENSE("GPL");

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