Signed-off-by: Corentin Chary <corenti...@iksaif.net>
---
.../ABI/testing/sysfs-driver-samsung-laptop | 8 ++
drivers/platform/x86/samsung-laptop.c | 82 ++++++++++++++++++++
2 files changed, 90 insertions(+), 0 deletions(-)
diff --git a/Documentation/ABI/testing/sysfs-driver-samsung-laptop
b/Documentation/ABI/testing/sysfs-driver-samsung-laptop
index a6a56e1..f05b897 100644
--- a/Documentation/ABI/testing/sysfs-driver-samsung-laptop
+++ b/Documentation/ABI/testing/sysfs-driver-samsung-laptop
@@ -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.ch...@gmail.com>
+Description: Use your USB ports to charge devices, even
+ when your laptop is powered off.
+ 1 means enabled, 0 means disabled.
diff --git a/drivers/platform/x86/samsung-laptop.c
b/drivers/platform/x86/samsung-laptop.c
index 16f45da..88acec9 100644
--- a/drivers/platform/x86/samsung-laptop.c
+++ b/drivers/platform/x86/samsung-laptop.c
@@ -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,
},
@@ -610,9 +620,79 @@ 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
};
@@ -713,6 +793,8 @@ 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;
}
--
1.7.5.4
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