From cb5b5c912ee8d97ea60c2d6c43d17ab6585947b8 Mon Sep 17 00:00:00 2001 From: Corentin Chary Date: Sat, 26 Nov 2011 11:00:05 +0100 Subject: [PATCH] samsung-laptop: add battery life extender support Signed-off-by: Corentin Chary Acked-by: Greg Kroah-Hartman Signed-off-by: Matthew Garrett --- .../ABI/testing/sysfs-driver-samsung-laptop | 10 +++ drivers/platform/x86/samsung-laptop.c | 82 +++++++++++++++++++ 2 files changed, 92 insertions(+) diff --git a/Documentation/ABI/testing/sysfs-driver-samsung-laptop b/Documentation/ABI/testing/sysfs-driver-samsung-laptop index 0a810231aad4..a6a56e11ebaf 100644 --- a/Documentation/ABI/testing/sysfs-driver-samsung-laptop +++ b/Documentation/ABI/testing/sysfs-driver-samsung-laptop @@ -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 +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) diff --git a/drivers/platform/x86/samsung-laptop.c b/drivers/platform/x86/samsung-laptop.c index b39fa53baa22..918fa358c11e 100644 --- a/drivers/platform/x86/samsung-laptop.c +++ b/drivers/platform/x86/samsung-laptop.c @@ -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; } -- 2.34.1