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-Kernel driver exynos4_tmu
-=================
-
-Supported chips:
-* ARM SAMSUNG EXYNOS4 series of SoC
- Prefix: 'exynos4-tmu'
- Datasheet: Not publicly available
-
-Authors: Donggeun Kim <dg77.kim@samsung.com>
-
-Description
------------
-
-This driver allows to read temperature inside SAMSUNG EXYNOS4 series of SoC.
-
-The chip only exposes the measured 8-bit temperature code value
-through a register.
-Temperature can be taken from the temperature code.
-There are three equations converting from temperature to temperature code.
-
-The three equations are:
- 1. Two point trimming
- Tc = (T - 25) * (TI2 - TI1) / (85 - 25) + TI1
-
- 2. One point trimming
- Tc = T + TI1 - 25
-
- 3. No trimming
- Tc = T + 50
-
- Tc: Temperature code, T: Temperature,
- TI1: Trimming info for 25 degree Celsius (stored at TRIMINFO register)
- Temperature code measured at 25 degree Celsius which is unchanged
- TI2: Trimming info for 85 degree Celsius (stored at TRIMINFO register)
- Temperature code measured at 85 degree Celsius which is unchanged
-
-TMU(Thermal Management Unit) in EXYNOS4 generates interrupt
-when temperature exceeds pre-defined levels.
-The maximum number of configurable threshold is four.
-The threshold levels are defined as follows:
- Level_0: current temperature > trigger_level_0 + threshold
- Level_1: current temperature > trigger_level_1 + threshold
- Level_2: current temperature > trigger_level_2 + threshold
- Level_3: current temperature > trigger_level_3 + threshold
-
- The threshold and each trigger_level are set
- through the corresponding registers.
-
-When an interrupt occurs, this driver notify user space of
-one of four threshold levels for the interrupt
-through kobject_uevent_env and sysfs_notify functions.
-Although an interrupt condition for level_0 can be set,
-it is not notified to user space through sysfs_notify function.
-
-Sysfs Interface
----------------
-name name of the temperature sensor
- RO
-
-temp1_input temperature
- RO
-
-temp1_max temperature for level_1 interrupt
- RO
-
-temp1_crit temperature for level_2 interrupt
- RO
-
-temp1_emergency temperature for level_3 interrupt
- RO
-
-temp1_max_alarm alarm for level_1 interrupt
- RO
-
-temp1_crit_alarm
- alarm for level_2 interrupt
- RO
-
-temp1_emergency_alarm
- alarm for level_3 interrupt
- RO