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1Kernel driver amc6821
2=====================
3
4Supported chips:
5
6 Texas Instruments AMC6821
7
8 Prefix: 'amc6821'
9
10 Addresses scanned: 0x18, 0x19, 0x1a, 0x2c, 0x2d, 0x2e, 0x4c, 0x4d, 0x4e
11
12 Datasheet: http://focus.ti.com/docs/prod/folders/print/amc6821.html
13
14Authors:
15 Tomaz Mertelj <tomaz.mertelj@guest.arnes.si>
16
17
18Description
19-----------
20
21This driver implements support for the Texas Instruments amc6821 chip.
22The chip has one on-chip and one remote temperature sensor and one pwm fan
23regulator.
24The pwm can be controlled either from software or automatically.
25
26The driver provides the following sensor accesses in sysfs:
27
28======================= == ===============================================
29temp1_input ro on-chip temperature
30temp1_min rw "
31temp1_max rw "
32temp1_crit rw "
33temp1_min_alarm ro "
34temp1_max_alarm ro "
35temp1_crit_alarm ro "
36
37temp2_input ro remote temperature
38temp2_min rw "
39temp2_max rw "
40temp2_crit rw "
41temp2_min_alarm ro "
42temp2_max_alarm ro "
43temp2_crit_alarm ro "
44temp2_fault ro "
45
46fan1_input ro tachometer speed
47fan1_min rw "
48fan1_max rw "
49fan1_fault ro "
50fan1_pulses rw Pulses per revolution can be either 2 or 4.
51fan1_target rw Target fan speed, to be used with pwm1_enable
52 mode 4.
53
54pwm1 rw pwm1
55pwm1_enable rw regulator mode, 1=open loop, 2=fan controlled
56 by remote temperature, 3=fan controlled by
57 combination of the on-chip temperature and
58 remote-sensor temperature,
59 4=fan controlled by target rpm set with
60 fan1_target attribute.
61pwm1_mode rw Fan duty control mode (0=DC, 1=PWM)
62pwm1_auto_channels_temp ro 1 if pwm_enable==2, 3 if pwm_enable==3
63pwm1_auto_point1_pwm ro Hardwired to 0, shared for both
64 temperature channels.
65pwm1_auto_point2_pwm rw This value is shared for both temperature
66 channels.
67pwm1_auto_point3_pwm rw Hardwired to 255, shared for both
68 temperature channels.
69
70temp1_auto_point1_temp ro Hardwired to temp2_auto_point1_temp
71 which is rw. Below this temperature fan stops.
72temp1_auto_point2_temp rw The low-temperature limit of the proportional
73 range. Below this temperature
74 pwm1 = pwm1_auto_point2_pwm. It can go from
75 0 degree C to 124 degree C in steps of
76 4 degree C. Read it out after writing to get
77 the actual value.
78temp1_auto_point3_temp rw Above this temperature fan runs at maximum
79 speed. It can go from temp1_auto_point2_temp.
80 It can only have certain discrete values
81 which depend on temp1_auto_point2_temp and
82 pwm1_auto_point2_pwm. Read it out after
83 writing to get the actual value.
84
85temp2_auto_point1_temp rw Must be between 0 degree C and 63 degree C and
86 it defines the passive cooling temperature.
87 Below this temperature the fan stops in
88 the closed loop mode.
89temp2_auto_point2_temp rw The low-temperature limit of the proportional
90 range. Below this temperature
91 pwm1 = pwm1_auto_point2_pwm. It can go from
92 0 degree C to 124 degree C in steps
93 of 4 degree C.
94
95temp2_auto_point3_temp rw Above this temperature fan runs at maximum
96 speed. It can only have certain discrete
97 values which depend on temp2_auto_point2_temp
98 and pwm1_auto_point2_pwm. Read it out after
99 writing to get actual value.
100======================= == ===============================================
101
102
103Module parameters
104-----------------
105
106If your board has a BIOS that initializes the amc6821 correctly, you should
107load the module with: init=0.
108
109If your board BIOS doesn't initialize the chip, or you want
110different settings, you can set the following parameters:
111
112- init=1,
113- pwminv: 0 default pwm output, 1 inverts pwm output.
1Kernel driver amc6821
2=====================
3
4Supported chips:
5
6 Texas Instruments AMC6821
7
8 Prefix: 'amc6821'
9
10 Addresses scanned: 0x18, 0x19, 0x1a, 0x2c, 0x2d, 0x2e, 0x4c, 0x4d, 0x4e
11
12 Datasheet: http://focus.ti.com/docs/prod/folders/print/amc6821.html
13
14Authors:
15 Tomaz Mertelj <tomaz.mertelj@guest.arnes.si>
16
17
18Description
19-----------
20
21This driver implements support for the Texas Instruments amc6821 chip.
22The chip has one on-chip and one remote temperature sensor and one pwm fan
23regulator.
24The pwm can be controlled either from software or automatically.
25
26The driver provides the following sensor accesses in sysfs:
27
28======================= == ===============================================
29temp1_input ro on-chip temperature
30temp1_min rw "
31temp1_max rw "
32temp1_crit rw "
33temp1_min_alarm ro "
34temp1_max_alarm ro "
35temp1_crit_alarm ro "
36
37temp2_input ro remote temperature
38temp2_min rw "
39temp2_max rw "
40temp2_crit rw "
41temp2_min_alarm ro "
42temp2_max_alarm ro "
43temp2_crit_alarm ro "
44temp2_fault ro "
45
46fan1_input ro tachometer speed
47fan1_min rw "
48fan1_max rw "
49fan1_fault ro "
50fan1_div rw Fan divisor can be either 2 or 4.
51
52pwm1 rw pwm1
53pwm1_enable rw regulator mode, 1=open loop, 2=fan controlled
54 by remote temperature, 3=fan controlled by
55 combination of the on-chip temperature and
56 remote-sensor temperature,
57pwm1_auto_channels_temp ro 1 if pwm_enable==2, 3 if pwm_enable==3
58pwm1_auto_point1_pwm ro Hardwired to 0, shared for both
59 temperature channels.
60pwm1_auto_point2_pwm rw This value is shared for both temperature
61 channels.
62pwm1_auto_point3_pwm rw Hardwired to 255, shared for both
63 temperature channels.
64
65temp1_auto_point1_temp ro Hardwired to temp2_auto_point1_temp
66 which is rw. Below this temperature fan stops.
67temp1_auto_point2_temp rw The low-temperature limit of the proportional
68 range. Below this temperature
69 pwm1 = pwm1_auto_point2_pwm. It can go from
70 0 degree C to 124 degree C in steps of
71 4 degree C. Read it out after writing to get
72 the actual value.
73temp1_auto_point3_temp rw Above this temperature fan runs at maximum
74 speed. It can go from temp1_auto_point2_temp.
75 It can only have certain discrete values
76 which depend on temp1_auto_point2_temp and
77 pwm1_auto_point2_pwm. Read it out after
78 writing to get the actual value.
79
80temp2_auto_point1_temp rw Must be between 0 degree C and 63 degree C and
81 it defines the passive cooling temperature.
82 Below this temperature the fan stops in
83 the closed loop mode.
84temp2_auto_point2_temp rw The low-temperature limit of the proportional
85 range. Below this temperature
86 pwm1 = pwm1_auto_point2_pwm. It can go from
87 0 degree C to 124 degree C in steps
88 of 4 degree C.
89
90temp2_auto_point3_temp rw Above this temperature fan runs at maximum
91 speed. It can only have certain discrete
92 values which depend on temp2_auto_point2_temp
93 and pwm1_auto_point2_pwm. Read it out after
94 writing to get actual value.
95======================= == ===============================================
96
97
98Module parameters
99-----------------
100
101If your board has a BIOS that initializes the amc6821 correctly, you should
102load the module with: init=0.
103
104If your board BIOS doesn't initialize the chip, or you want
105different settings, you can set the following parameters:
106
107- init=1,
108- pwminv: 0 default pwm output, 1 inverts pwm output.