We have been reading hwmon values (TMU, the SoC-core temperature sensor,
and NTC, the ambient or battery surface temperature sensor) for
Charger-Manager. However, because hwmon does not have in-kernel interface,
we have been using undesired method, including "../../../fs/*.h".
This patch is to provide in-kernel interface for hwmon:
hwmon_get_value and hwmon_set_value. In order to use these two functions,
a) the hwmon driver should provide its sysfs attributes to hwmon framework,
and b) the hwmon_{get/set}_value caller should get the hwmon property pointer
with hwmon_find_device(dev) or hwmon_find_device_name(device-name).
A hwmon driver may provide its sysfs attributes with
hwmon_register_property(hwmon, attr) or
hwmon_register_properties(hwmon, attr_group)
In patch 2/2, we have added "register_property" for NTC-thermistor,
Exynos4-TMU, and S3C-HWMON drivers.
As soon as the server synchronizes git repositories, you can see how
hwmon_get_value() is used at:
http://git.infradead.org/users/kmpark/linux-2.6-samsung/shortlog/refs/heads/charger-manager
MyungJoo Ham (2):
HWMON: add interfaces to read/write hwmon values inside kernel
HWMON: support in-kernel HWMON API: NTC, S3C-HWMON, Exynos4-TMU
drivers/hwmon/exynos4_tmu.c | 2 +
drivers/hwmon/hwmon.c | 353 +++++++++++++++++++++++++++++++++++++++-
drivers/hwmon/ntc_thermistor.c | 2 +
drivers/hwmon/s3c-hwmon.c | 10 +
include/linux/hwmon.h | 34 ++++
5 files changed, 400 insertions(+), 1 deletions(-)
--
1.7.4.1
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