Merge branch 'for_linus' of git://cavan.codon.org.uk/platform-drivers-x86
[~shefty/rdma-dev.git] / Documentation / ABI / testing / sysfs-driver-samsung-laptop
1 What:           /sys/devices/platform/samsung/performance_level
2 Date:           January 1, 2010
3 KernelVersion:  2.6.33
4 Contact:        Greg Kroah-Hartman <gregkh@linuxfoundation.org>
5 Description:    Some Samsung laptops have different "performance levels"
6                 that are can be modified by a function key, and by this
7                 sysfs file.  These values don't always make a whole lot
8                 of sense, but some users like to modify them to keep
9                 their fans quiet at all costs.  Reading from this file
10                 will show the current performance level.  Writing to the
11                 file can change this value.
12                         Valid options:
13                                 "silent"
14                                 "normal"
15                                 "overclock"
16                 Note that not all laptops support all of these options.
17                 Specifically, not all support the "overclock" option,
18                 and it's still unknown if this value even changes
19                 anything, other than making the user feel a bit better.
20
21 What:           /sys/devices/platform/samsung/battery_life_extender
22 Date:           December 1, 2011
23 KernelVersion:  3.3
24 Contact:        Corentin Chary <corentin.chary@gmail.com>
25 Description:    Max battery charge level can be modified, battery cycle
26                 life can be extended by reducing the max battery charge
27                 level.
28                 0 means normal battery mode (100% charge)
29                 1 means battery life extender mode (80% charge)
30
31 What:           /sys/devices/platform/samsung/usb_charge
32 Date:           December 1, 2011
33 KernelVersion:  3.3
34 Contact:        Corentin Chary <corentin.chary@gmail.com>
35 Description:    Use your USB ports to charge devices, even
36                 when your laptop is powered off.
37                 1 means enabled, 0 means disabled.