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samsung-laptop: add usb charge support 

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 11:00:06 +01:00 committed by Matthew Garrett
parent cb5b5c912e
commit 3a75d37870
2 changed files with 90 additions and 0 deletions
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8
Documentation/ABI/testing/sysfs-driver-samsung-laptop
View File

@ -27,3 +27,11 @@ Description: Max battery charge level can be modified, battery cycle
level.
0 means normal battery mode (100% charge)
1 means battery life extender mode (80% charge)
What: /sys/devices/platform/samsung/usb_charge
Date: December 1, 2011
KernelVersion: 3.3
Contact: Corentin Chary <corentin.chary@gmail.com>
Description: Use your USB ports to charge devices, even
when your laptop is powered off.
1 means enabled, 0 means disabled.

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

@ -108,6 +108,10 @@ struct sabi_commands {
u16 get_battery_life_extender;
u16 set_battery_life_extender;
/* 0x80 is off, 0x81 is on */
u16 get_usb_charge;
u16 set_usb_charge;
/*
* Tell the BIOS that Linux is running on this machine.
* 81 is on, 80 is off
@ -164,6 +168,9 @@ static const struct sabi_config sabi_configs[] = {
.get_battery_life_extender = 0xFFFF,
.set_battery_life_extender = 0xFFFF,
.get_usb_charge = 0xFFFF,
.set_usb_charge = 0xFFFF,
.set_linux = 0x0a,
},
@ -214,6 +221,9 @@ static const struct sabi_config sabi_configs[] = {
.get_battery_life_extender = 0x65,
.set_battery_life_extender = 0x66,
.get_usb_charge = 0x67,
.set_usb_charge = 0x68,
.set_linux = 0xff,
},
@ -622,9 +632,79 @@ static ssize_t set_battery_life_extender(struct device *dev,
static DEVICE_ATTR(battery_life_extender, S_IWUSR | S_IRUGO,
get_battery_life_extender, set_battery_life_extender);
static int read_usb_charge(struct samsung_laptop *samsung)
{
const struct sabi_commands *commands = &samsung->config->commands;
struct sabi_data data;
int retval;
if (commands->get_usb_charge == 0xFFFF)
return -ENODEV;
memset(&data, 0, sizeof(data));
data.data[0] = 0x80;
retval = sabi_command(samsung, commands->get_usb_charge,
&data, &data);
if (retval)
return retval;
if (data.data[0] != 0 && data.data[0] != 1)
return -ENODEV;
return data.data[0];
}
static int write_usb_charge(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_usb_charge,
&data, NULL);
}
static ssize_t get_usb_charge(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct samsung_laptop *samsung = dev_get_drvdata(dev);
int ret;
ret = read_usb_charge(samsung);
if (ret < 0)
return ret;
return sprintf(buf, "%d\n", ret);
}
static ssize_t set_usb_charge(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_usb_charge(samsung, !!value);
if (ret < 0)
return ret;
return count;
}
static DEVICE_ATTR(usb_charge, S_IWUSR | S_IRUGO,
get_usb_charge, set_usb_charge);
static struct attribute *platform_attributes[] = {
&dev_attr_performance_level.attr,
&dev_attr_battery_life_extender.attr,
&dev_attr_usb_charge.attr,
NULL
};
@ -725,6 +805,8 @@ static mode_t samsung_sysfs_is_visible(struct kobject *kobj,
ok = !!samsung->config->performance_levels[0].name;
if (attr == &dev_attr_battery_life_extender.attr)
ok = !!(read_battery_life_extender(samsung) >= 0);
if (attr == &dev_attr_usb_charge.attr)
ok = !!(read_usb_charge(samsung) >= 0);
return ok ? attr->mode : 0;
}