From 3a75d378703495a90d6b2b49a3f5332c953879e2 Mon Sep 17 00:00:00 2001 From: Corentin Chary Date: Sat, 26 Nov 2011 11:00:06 +0100 Subject: [PATCH] samsung-laptop: add usb charge support Signed-off-by: Corentin Chary Acked-by: Greg Kroah-Hartman Signed-off-by: Matthew Garrett --- .../ABI/testing/sysfs-driver-samsung-laptop | 8 ++ drivers/platform/x86/samsung-laptop.c | 82 +++++++++++++++++++ 2 files changed, 90 insertions(+) diff --git a/Documentation/ABI/testing/sysfs-driver-samsung-laptop b/Documentation/ABI/testing/sysfs-driver-samsung-laptop index a6a56e11ebaf..f05b897805e5 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 +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 918fa358c11e..b8d2145981e0 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, }, @@ -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; } -- 2.20.1