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 <<
49 <<
50 Addresses scanned: I2C 0x18, 0x4c, 0x4d <<
51 <<
52 Prefix: 'emc1428', 'emc1438' <<
53 <<
54 Datasheets: <<
55 <<
56 - https://ww1.microchip.com/downloads/ <<
57 - https://ww1.microchip.com/downloads/ <<
58 <<
59 Author: 48 Author:
60 Kalhan Trisal <kalhan.trisal@intel.com 49 Kalhan Trisal <kalhan.trisal@intel.com
61 50
62 51
63 Description 52 Description
64 ----------- 53 -----------
65 54
66 The Standard Microsystems Corporation (SMSC) / 55 The Standard Microsystems Corporation (SMSC) / Microchip EMC14xx chips
67 contain up to eight temperature sensors. EMC14 !! 56 contain up to four temperature sensors. EMC14x2 support two sensors
68 (one internal, one external). EMC14x3 support 57 (one internal, one external). EMC14x3 support three sensors (one internal,
69 two external), EMC14x4 support four sensors (o !! 58 two external), and EMC14x4 support four sensors (one internal, three
70 and EMC14x8 support eight sensors (one interna !! 59 external).
71 60
72 The chips implement three limits for each sens 61 The chips implement three limits for each sensor: low (tempX_min), high
73 (tempX_max) and critical (tempX_crit.) The chi 62 (tempX_max) and critical (tempX_crit.) The chips also implement an
74 hysteresis mechanism which applies to all limi 63 hysteresis mechanism which applies to all limits. The relative difference
75 is stored in a single register on the chip, wh 64 is stored in a single register on the chip, which means that the relative
76 difference between the limit and its hysteresi 65 difference between the limit and its hysteresis is always the same for
77 all three limits. 66 all three limits.
78 67
79 This implementation detail implies the followi 68 This implementation detail implies the following:
80 69
81 * When setting a limit, its hysteresis will au 70 * When setting a limit, its hysteresis will automatically follow, the
82 difference staying unchanged. For example, i 71 difference staying unchanged. For example, if the old critical limit
83 was 80 degrees C, and the hysteresis was 75 72 was 80 degrees C, and the hysteresis was 75 degrees C, and you change
84 the critical limit to 90 degrees C, then the 73 the critical limit to 90 degrees C, then the hysteresis will
85 automatically change to 85 degrees C. 74 automatically change to 85 degrees C.
86 * The hysteresis values can't be set independe 75 * The hysteresis values can't be set independently. We decided to make
87 only temp1_crit_hyst writable, while all oth 76 only temp1_crit_hyst writable, while all other hysteresis attributes
88 are read-only. Setting temp1_crit_hyst write 77 are read-only. Setting temp1_crit_hyst writes the difference between
89 temp1_crit_hyst and temp1_crit into the chip 78 temp1_crit_hyst and temp1_crit into the chip, and the same relative
90 hysteresis applies automatically to all othe 79 hysteresis applies automatically to all other limits.
91 * The limits should be set before the hysteres 80 * The limits should be set before the hysteresis.
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.