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samsung-laptop: add battery life extender support

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Signed-off-by: Corentin Chary <corentincj@iksaif.net>
Acked-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Matthew Garrett <mjg@redhat.com>
This commit is contained in:
Corentin Chary 2011-11-26 11:00:05 +01:00 committed by Matthew Garrett
parent 49dd77308b
commit cb5b5c912e
2 changed files with 92 additions and 0 deletions
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10
Documentation/ABI/testing/sysfs-driver-samsung-laptop
View File

@ -17,3 +17,13 @@ Description: Some Samsung laptops have different "performance levels"
Specifically, not all support the "overclock" option,
and it's still unknown if this value even changes
anything, other than making the user feel a bit better.
What: /sys/devices/platform/samsung/battery_life_extender
Date: December 1, 2011
KernelVersion: 3.3
Contact: Corentin Chary <corentin.chary@gmail.com>
Description: Max battery charge level can be modified, battery cycle
life can be extended by reducing the max battery charge
level.
0 means normal battery mode (100% charge)
1 means battery life extender mode (80% charge)

82
drivers/platform/x86/samsung-laptop.c
View File

@ -104,6 +104,10 @@ struct sabi_commands {
u16 get_performance_level;
u16 set_performance_level;
/* 0x80 is off, 0x81 is on */
u16 get_battery_life_extender;
u16 set_battery_life_extender;
/*
* Tell the BIOS that Linux is running on this machine.
* 81 is on, 80 is off
@ -157,6 +161,9 @@ static const struct sabi_config sabi_configs[] = {
.get_performance_level = 0x08,
.set_performance_level = 0x09,
.get_battery_life_extender = 0xFFFF,
.set_battery_life_extender = 0xFFFF,
.set_linux = 0x0a,
},
@ -204,6 +211,9 @@ static const struct sabi_config sabi_configs[] = {
.get_performance_level = 0x31,
.set_performance_level = 0x32,
.get_battery_life_extender = 0x65,
.set_battery_life_extender = 0x66,
.set_linux = 0xff,
},
@ -543,8 +553,78 @@ static ssize_t set_performance_level(struct device *dev,
static DEVICE_ATTR(performance_level, S_IWUSR | S_IRUGO,
get_performance_level, set_performance_level);
static int read_battery_life_extender(struct samsung_laptop *samsung)
{
const struct sabi_commands *commands = &samsung->config->commands;
struct sabi_data data;
int retval;
if (commands->get_battery_life_extender == 0xFFFF)
return -ENODEV;
memset(&data, 0, sizeof(data));
data.data[0] = 0x80;
retval = sabi_command(samsung, commands->get_battery_life_extender,
&data, &data);
if (retval)
return retval;
if (data.data[0] != 0 && data.data[0] != 1)
return -ENODEV;
return data.data[0];
}
static int write_battery_life_extender(struct samsung_laptop *samsung,
int enabled)
{
const struct sabi_commands *commands = &samsung->config->commands;
struct sabi_data data;
memset(&data, 0, sizeof(data));
data.data[0] = 0x80 | enabled;
return sabi_command(samsung, commands->set_battery_life_extender,
&data, NULL);
}
static ssize_t get_battery_life_extender(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct samsung_laptop *samsung = dev_get_drvdata(dev);
int ret;
ret = read_battery_life_extender(samsung);
if (ret < 0)
return ret;
return sprintf(buf, "%d\n", ret);
}
static ssize_t set_battery_life_extender(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct samsung_laptop *samsung = dev_get_drvdata(dev);
int ret, value;
if (!count || sscanf(buf, "%i", &value) != 1)
return -EINVAL;
ret = write_battery_life_extender(samsung, !!value);
if (ret < 0)
return ret;
return count;
}
static DEVICE_ATTR(battery_life_extender, S_IWUSR | S_IRUGO,
get_battery_life_extender, set_battery_life_extender);
static struct attribute *platform_attributes[] = {
&dev_attr_performance_level.attr,
&dev_attr_battery_life_extender.attr,
NULL
};
@ -643,6 +723,8 @@ static mode_t samsung_sysfs_is_visible(struct kobject *kobj,
if (attr == &dev_attr_performance_level.attr)
ok = !!samsung->config->performance_levels[0].name;
if (attr == &dev_attr_battery_life_extender.attr)
ok = !!(read_battery_life_extender(samsung) >= 0);
return ok ? attr->mode : 0;
}