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authorLen Brown <len.brown@intel.com>2012-10-09 01:35:52 -0400
committerLen Brown <len.brown@intel.com>2012-10-09 01:35:52 -0400
commit29b19e250434c6193c8b8e4c34c9c6284dd4f101 (patch)
tree8a1c8e308c9ae964f7fb612e921e10cf4c30ba15 /Documentation/hwmon
parent125c4c706b680c7831f0966ff873c1ad0354ec25 (diff)
parentc072fed95c9855a920c114d7fa3351f0f54ea06e (diff)
Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/rzhang/linux into thermal
Conflicts: drivers/staging/omap-thermal/omap-thermal-common. OMAP supplied dummy TC1 and TC2, at the same time that the thermal tree removed them from thermal_zone_device_register() drivers/thermal/cpu_cooling.c b/drivers/thermal/cpu_cooling.c propogate the upstream MAX_IDR_LEVEL re-name to prevent a build failure Previously-fixed-by: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Len Brown <len.brown@intel.com>
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1Kernel driver exynos4_tmu
2=================
3
4Supported chips:
5* ARM SAMSUNG EXYNOS4 series of SoC
6 Prefix: 'exynos4-tmu'
7 Datasheet: Not publicly available
8
9Authors: Donggeun Kim <dg77.kim@samsung.com>
10
11Description
12-----------
13
14This driver allows to read temperature inside SAMSUNG EXYNOS4 series of SoC.
15
16The chip only exposes the measured 8-bit temperature code value
17through a register.
18Temperature can be taken from the temperature code.
19There are three equations converting from temperature to temperature code.
20
21The three equations are:
22 1. Two point trimming
23 Tc = (T - 25) * (TI2 - TI1) / (85 - 25) + TI1
24
25 2. One point trimming
26 Tc = T + TI1 - 25
27
28 3. No trimming
29 Tc = T + 50
30
31 Tc: Temperature code, T: Temperature,
32 TI1: Trimming info for 25 degree Celsius (stored at TRIMINFO register)
33 Temperature code measured at 25 degree Celsius which is unchanged
34 TI2: Trimming info for 85 degree Celsius (stored at TRIMINFO register)
35 Temperature code measured at 85 degree Celsius which is unchanged
36
37TMU(Thermal Management Unit) in EXYNOS4 generates interrupt
38when temperature exceeds pre-defined levels.
39The maximum number of configurable threshold is four.
40The threshold levels are defined as follows:
41 Level_0: current temperature > trigger_level_0 + threshold
42 Level_1: current temperature > trigger_level_1 + threshold
43 Level_2: current temperature > trigger_level_2 + threshold
44 Level_3: current temperature > trigger_level_3 + threshold
45
46 The threshold and each trigger_level are set
47 through the corresponding registers.
48
49When an interrupt occurs, this driver notify user space of
50one of four threshold levels for the interrupt
51through kobject_uevent_env and sysfs_notify functions.
52Although an interrupt condition for level_0 can be set,
53it is not notified to user space through sysfs_notify function.
54
55Sysfs Interface
56---------------
57name name of the temperature sensor
58 RO
59
60temp1_input temperature
61 RO
62
63temp1_max temperature for level_1 interrupt
64 RO
65
66temp1_crit temperature for level_2 interrupt
67 RO
68
69temp1_emergency temperature for level_3 interrupt
70 RO
71
72temp1_max_alarm alarm for level_1 interrupt
73 RO
74
75temp1_crit_alarm
76 alarm for level_2 interrupt
77 RO
78
79temp1_emergency_alarm
80 alarm for level_3 interrupt
81 RO