diff options
| author | Henrique de Moraes Holschuh <hmh@hmh.eng.br> | 2006-11-24 11:47:08 -0200 |
|---|---|---|
| committer | Len Brown <len.brown@intel.com> | 2006-12-07 01:38:38 -0500 |
| commit | 60eb0b35a9cc3400251cb4028d100e350649cf8a (patch) | |
| tree | 2f655a273572e46b6c4f662071d027e57cad1bcf /kernel/kallsyms.c | |
| parent | a26f878abcd0491906b5bbac8dd174f27019e907 (diff) | |
ACPI: ibm-acpi: Implement direct-ec-access thermal reading modes for up to 16 sensors
This patch extends ibm-acpi to support reading thermal sensors directly
through ACPI EC register access. It uses a DMI match to detect ThinkPads
with a new-style embedded controller, that are known to have forward-
compatible register maps and use 0x00 to fill in non-used registers and
export thermal sensors at EC offsets 0x78-7F and 0xC0-C7.
Direct ACPI EC register access is implemented for 8-sensor and 16-sensor
new-style ThinkPad controller firmwares as an experimental feature. The
code does some limited sanity checks on the temperatures read through EC
access, and will default to the old ACPI TMP0-7 mode if anything is amiss.
Userspace ABI is not changed for 8 sensors, but /proc/acpi/ibm/thermal is
extended for 16 sensors if the firmware supports 16 sensors.
A documentation update is also provided.
The information about the ThinkPad register map was determined by studying
ibm-acpi "ecdump" output from various ThinkPad models, submitted by
subscribers of the linux-thinkpad mailinglist. Futher information was
gathered from the DSDT tables, as they describe the EC register map in
recent ThinkPads.
DSDT source shows that TMP0-7 access and direct register access are
actually the same thing on these firmwares, but unfortunately IBM never
did update their DSDT EC register map to export TMP8-TMP15 for the second
range of sensors.
Signed-off-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
Diffstat (limited to 'kernel/kallsyms.c')
0 files changed, 0 insertions, 0 deletions