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61 lines
2.2 KiB
61 lines
2.2 KiB
===================== |
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Exynos Emulation Mode |
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===================== |
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Copyright (C) 2012 Samsung Electronics |
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Written by Jonghwa Lee <[email protected]> |
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Description |
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----------- |
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Exynos 4x12 (4212, 4412) and 5 series provide emulation mode for thermal |
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management unit. Thermal emulation mode supports software debug for |
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TMU's operation. User can set temperature manually with software code |
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and TMU will read current temperature from user value not from sensor's |
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value. |
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Enabling CONFIG_THERMAL_EMULATION option will make this support |
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available. When it's enabled, sysfs node will be created as |
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/sys/devices/virtual/thermal/thermal_zone'zone id'/emul_temp. |
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The sysfs node, 'emul_node', will contain value 0 for the initial state. |
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When you input any temperature you want to update to sysfs node, it |
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automatically enable emulation mode and current temperature will be |
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changed into it. |
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(Exynos also supports user changeable delay time which would be used to |
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delay of changing temperature. However, this node only uses same delay |
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of real sensing time, 938us.) |
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Exynos emulation mode requires synchronous of value changing and |
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enabling. It means when you want to update the any value of delay or |
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next temperature, then you have to enable emulation mode at the same |
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time. (Or you have to keep the mode enabling.) If you don't, it fails to |
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change the value to updated one and just use last succeessful value |
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repeatedly. That's why this node gives users the right to change |
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termerpature only. Just one interface makes it more simply to use. |
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Disabling emulation mode only requires writing value 0 to sysfs node. |
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:: |
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TEMP 120 | |
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100 | |
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80 | |
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| +----------- |
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60 | | | |
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| +-------------| | |
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40 | | | | |
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20 | | | +---------- |
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0 |______________|_____________|__________|__________|_________ |
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A A A A TIME |
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|<----->| |<----->| |<----->| | |
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| 938us | | | | | | |
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emulation : 0 50 | 70 | 20 | 0 |
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current temp: sensor 50 70 20 sensor
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