1 Kernel driver emc1403 1 Kernel driver emc1403
2 ===================== 2 =====================
3 3
4 Supported chips: 4 Supported chips:
5 5
6 * SMSC / Microchip EMC1402, EMC1412 6 * SMSC / Microchip EMC1402, EMC1412
7 7
8 Addresses scanned: I2C 0x18, 0x1c, 0x29, 0 8 Addresses scanned: I2C 0x18, 0x1c, 0x29, 0x4c, 0x4d, 0x5c
9 9
10 Prefix: 'emc1402' 10 Prefix: 'emc1402'
11 11
12 Datasheets: 12 Datasheets:
13 13
14 - http://ww1.microchip.com/downloads/e 14 - http://ww1.microchip.com/downloads/en/DeviceDoc/1412.pdf
15 - https://ww1.microchip.com/downloads/ 15 - https://ww1.microchip.com/downloads/en/DeviceDoc/1402.pdf
16 16
17 * SMSC / Microchip EMC1403, EMC1404, EMC1413 17 * SMSC / Microchip EMC1403, EMC1404, EMC1413, EMC1414
18 18
19 Addresses scanned: I2C 0x18, 0x29, 0x4c, 0 19 Addresses scanned: I2C 0x18, 0x29, 0x4c, 0x4d
20 20
21 Prefix: 'emc1403', 'emc1404' 21 Prefix: 'emc1403', 'emc1404'
22 22
23 Datasheets: 23 Datasheets:
24 24
25 - http://ww1.microchip.com/downloads/e 25 - http://ww1.microchip.com/downloads/en/DeviceDoc/1403_1404.pdf
26 - http://ww1.microchip.com/downloads/e 26 - http://ww1.microchip.com/downloads/en/DeviceDoc/1413_1414.pdf
27 27
28 * SMSC / Microchip EMC1422 28 * SMSC / Microchip EMC1422
29 29
30 Addresses scanned: I2C 0x4c 30 Addresses scanned: I2C 0x4c
31 31
32 Prefix: 'emc1422' 32 Prefix: 'emc1422'
33 33
34 Datasheet: 34 Datasheet:
35 35
36 - https://ww1.microchip.com/downloads/ 36 - https://ww1.microchip.com/downloads/en/DeviceDoc/1422.pdf
37 37
38 * SMSC / Microchip EMC1423, EMC1424 38 * SMSC / Microchip EMC1423, EMC1424
39 39
40 Addresses scanned: I2C 0x4c 40 Addresses scanned: I2C 0x4c
41 41
42 Prefix: 'emc1423', 'emc1424' 42 Prefix: 'emc1423', 'emc1424'
43 43
44 Datasheet: 44 Datasheet:
45 45
46 - https://ww1.microchip.com/downloads/ 46 - https://ww1.microchip.com/downloads/en/DeviceDoc/1423_1424.pdf
47 47
48 * SMSC / Microchip EMC1428, EMC1438 48 * SMSC / Microchip EMC1428, EMC1438
49 49
50 Addresses scanned: I2C 0x18, 0x4c, 0x4d 50 Addresses scanned: I2C 0x18, 0x4c, 0x4d
51 51
52 Prefix: 'emc1428', 'emc1438' 52 Prefix: 'emc1428', 'emc1438'
53 53
54 Datasheets: 54 Datasheets:
55 55
56 - https://ww1.microchip.com/downloads/ 56 - https://ww1.microchip.com/downloads/aemDocuments/documents/OTH/ProductDocuments/DataSheets/20005275A.pdf
57 - https://ww1.microchip.com/downloads/ 57 - https://ww1.microchip.com/downloads/en/DeviceDoc/EMC1438%20DS%20Rev.%201.0%20(04-29-10).pdf
58 58
59 Author: 59 Author:
60 Kalhan Trisal <kalhan.trisal@intel.com 60 Kalhan Trisal <kalhan.trisal@intel.com
61 61
62 62
63 Description 63 Description
64 ----------- 64 -----------
65 65
66 The Standard Microsystems Corporation (SMSC) / 66 The Standard Microsystems Corporation (SMSC) / Microchip EMC14xx chips
67 contain up to eight temperature sensors. EMC14 67 contain up to eight temperature sensors. EMC14x2 support two sensors
68 (one internal, one external). EMC14x3 support 68 (one internal, one external). EMC14x3 support three sensors (one internal,
69 two external), EMC14x4 support four sensors (o 69 two external), EMC14x4 support four sensors (one internal, three external),
70 and EMC14x8 support eight sensors (one interna 70 and EMC14x8 support eight sensors (one internal, seven external).
71 71
72 The chips implement three limits for each sens 72 The chips implement three limits for each sensor: low (tempX_min), high
73 (tempX_max) and critical (tempX_crit.) The chi 73 (tempX_max) and critical (tempX_crit.) The chips also implement an
74 hysteresis mechanism which applies to all limi 74 hysteresis mechanism which applies to all limits. The relative difference
75 is stored in a single register on the chip, wh 75 is stored in a single register on the chip, which means that the relative
76 difference between the limit and its hysteresi 76 difference between the limit and its hysteresis is always the same for
77 all three limits. 77 all three limits.
78 78
79 This implementation detail implies the followi 79 This implementation detail implies the following:
80 80
81 * When setting a limit, its hysteresis will au 81 * When setting a limit, its hysteresis will automatically follow, the
82 difference staying unchanged. For example, i 82 difference staying unchanged. For example, if the old critical limit
83 was 80 degrees C, and the hysteresis was 75 83 was 80 degrees C, and the hysteresis was 75 degrees C, and you change
84 the critical limit to 90 degrees C, then the 84 the critical limit to 90 degrees C, then the hysteresis will
85 automatically change to 85 degrees C. 85 automatically change to 85 degrees C.
86 * The hysteresis values can't be set independe 86 * The hysteresis values can't be set independently. We decided to make
87 only temp1_crit_hyst writable, while all oth 87 only temp1_crit_hyst writable, while all other hysteresis attributes
88 are read-only. Setting temp1_crit_hyst write 88 are read-only. Setting temp1_crit_hyst writes the difference between
89 temp1_crit_hyst and temp1_crit into the chip 89 temp1_crit_hyst and temp1_crit into the chip, and the same relative
90 hysteresis applies automatically to all othe 90 hysteresis applies automatically to all other limits.
91 * The limits should be set before the hysteres 91 * The limits should be set before the hysteresis.
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