1 Kernel driver adm1026
2 =====================
3
4 Supported chips:
5 * Analog Devices ADM1026
6
7 Prefix: 'adm1026'
8
9 Addresses scanned: I2C 0x2c, 0x2d, 0x2e
10
11 Datasheet: Publicly available at the Analo
12
13 https://www.onsemi.com/PowerSol
14
15 Authors:
16 - Philip Pokorny <ppokorny@penguincompu
17 - Justin Thiessen <jthiessen@penguincom
18
19 Module Parameters
20 -----------------
21
22 * gpio_input: int array (min = 1, max = 17)
23 List of GPIO pins (0-16) to program as inp
24
25 * gpio_output: int array (min = 1, max = 17)
26 List of GPIO pins (0-16) to program as out
27
28 * gpio_inverted: int array (min = 1, max = 17)
29 List of GPIO pins (0-16) to program as inv
30
31 * gpio_normal: int array (min = 1, max = 17)
32 List of GPIO pins (0-16) to program as nor
33
34 * gpio_fan: int array (min = 1, max = 8)
35 List of GPIO pins (0-7) to program as fan
36
37
38 Description
39 -----------
40
41 This driver implements support for the Analog
42 Devices calls it a "complete thermal system ma
43
44 The ADM1026 implements three (3) temperature s
45 16 general purpose digital I/O lines, eight (8
46 an analog output and a PWM output along with l
47 all of the above. There is even 8k bytes of EE
48
49 Temperatures are measured in degrees Celsius.
50 sensor inputs and one internal sensor. Each se
51 limit. If the limit is exceeded, an interrupt
52 generated. The interrupts can be masked. In ad
53 limits for each sensor. If this limit is excee
54 be asserted. The current temperature and limit
55 degree.
56
57 Fan rotation speeds are reported in RPM (rotat
58 in counts of a 22.5kHz internal clock. Each fa
59 corresponds to a minimum fan speed. If the lim
60 can be generated. Each fan can be programmed t
61 by 1, 2, 4 or 8. Not all RPM values can accura
62 rounding is done. With a divider of 8, the slo
63 two pulse per revolution fan is 661 RPM.
64
65 There are 17 voltage sensors. An alarm is trig
66 crossed a programmable minimum or maximum limi
67 case always means 'closest to zero'; this is i
68 measurements. Several inputs have integrated a
69 higher voltages directly. 3.3V, 5V, 12V, -12V
70 dedicated inputs. There are several inputs sca
71 for SCSI terminator power. The remaining input
72 a 0-2.5V full-scale range. A 2.5V or 1.82V ref
73 for negative voltage measurements.
74
75 If an alarm triggers, it will remain triggered
76 is read at least once. This means that the cau
77 have disappeared! Note that in the current imp
78 registers are read whenever any data is read (
79 seconds since the last update). This means tha
80 once-only alarms.
81
82 The ADM1026 measures continuously. Analog inpu
83 times a second. Fan speed measurement time dep
84 divisor. It can take as long as 1.5 seconds to
85
86 The ADM1026 has the ability to automatically c
87 temperature sensor inputs. Both the PWM output
88 used to control fan speed. Usually only one of
89 used. Write the minimum PWM or DAC value to th
90 register. Then set the low temperature limit i
91 temperature sensor. The range of control is fi
92 largest difference between current and tmin of
93 the control output. See the datasheet for seve
94 controlling fan speed with the PWM and DAC out
95 do not have PWM compensation, so it is probabl
96 voltage from the power lead rather than on the
97
98 The datasheet shows an example application wit
99 GPIO lines. Unfortunately, the chip may not be
100 in this way. The driver assumes that the chips
101 get a VID voltage.
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