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1 | Kernel driver ltc2978 | ||
2 | ===================== | ||
3 | |||
4 | Supported chips: | ||
5 | * Linear Technology LTC2978 | ||
6 | Prefix: 'ltc2978' | ||
7 | Addresses scanned: - | ||
8 | Datasheet: http://cds.linear.com/docs/Datasheet/2978fa.pdf | ||
9 | * Linear Technology LTC3880 | ||
10 | Prefix: 'ltc3880' | ||
11 | Addresses scanned: - | ||
12 | Datasheet: http://cds.linear.com/docs/Datasheet/3880f.pdf | ||
13 | |||
14 | Author: Guenter Roeck <guenter.roeck@ericsson.com> | ||
15 | |||
16 | |||
17 | Description | ||
18 | ----------- | ||
19 | |||
20 | The LTC2978 is an octal power supply monitor, supervisor, sequencer and | ||
21 | margin controller. The LTC3880 is a dual, PolyPhase DC/DC synchronous | ||
22 | step-down switching regulator controller. | ||
23 | |||
24 | |||
25 | Usage Notes | ||
26 | ----------- | ||
27 | |||
28 | This driver does not probe for PMBus devices. You will have to instantiate | ||
29 | devices explicitly. | ||
30 | |||
31 | Example: the following commands will load the driver for an LTC2978 at address | ||
32 | 0x60 on I2C bus #1: | ||
33 | |||
34 | # modprobe ltc2978 | ||
35 | # echo ltc2978 0x60 > /sys/bus/i2c/devices/i2c-1/new_device | ||
36 | |||
37 | |||
38 | Sysfs attributes | ||
39 | ---------------- | ||
40 | |||
41 | in1_label "vin" | ||
42 | in1_input Measured input voltage. | ||
43 | in1_min Minimum input voltage. | ||
44 | in1_max Maximum input voltage. | ||
45 | in1_lcrit Critical minimum input voltage. | ||
46 | in1_crit Critical maximum input voltage. | ||
47 | in1_min_alarm Input voltage low alarm. | ||
48 | in1_max_alarm Input voltage high alarm. | ||
49 | in1_lcrit_alarm Input voltage critical low alarm. | ||
50 | in1_crit_alarm Input voltage critical high alarm. | ||
51 | in1_lowest Lowest input voltage. LTC2978 only. | ||
52 | in1_highest Highest input voltage. | ||
53 | in1_reset_history Reset history. Writing into this attribute will reset | ||
54 | history for all attributes. | ||
55 | |||
56 | in[2-9]_label "vout[1-8]". Channels 3 to 9 on LTC2978 only. | ||
57 | in[2-9]_input Measured output voltage. | ||
58 | in[2-9]_min Minimum output voltage. | ||
59 | in[2-9]_max Maximum output voltage. | ||
60 | in[2-9]_lcrit Critical minimum output voltage. | ||
61 | in[2-9]_crit Critical maximum output voltage. | ||
62 | in[2-9]_min_alarm Output voltage low alarm. | ||
63 | in[2-9]_max_alarm Output voltage high alarm. | ||
64 | in[2-9]_lcrit_alarm Output voltage critical low alarm. | ||
65 | in[2-9]_crit_alarm Output voltage critical high alarm. | ||
66 | in[2-9]_lowest Lowest output voltage. LTC2978 only. | ||
67 | in[2-9]_highest Lowest output voltage. | ||
68 | in[2-9]_reset_history Reset history. Writing into this attribute will reset | ||
69 | history for all attributes. | ||
70 | |||
71 | temp[1-3]_input Measured temperature. | ||
72 | On LTC2978, only one temperature measurement is | ||
73 | supported and reflects the internal temperature. | ||
74 | On LTC3880, temp1 and temp2 report external | ||
75 | temperatures, and temp3 reports the internal | ||
76 | temperature. | ||
77 | temp[1-3]_min Mimimum temperature. | ||
78 | temp[1-3]_max Maximum temperature. | ||
79 | temp[1-3]_lcrit Critical low temperature. | ||
80 | temp[1-3]_crit Critical high temperature. | ||
81 | temp[1-3]_min_alarm Chip temperature low alarm. | ||
82 | temp[1-3]_max_alarm Chip temperature high alarm. | ||
83 | temp[1-3]_lcrit_alarm Chip temperature critical low alarm. | ||
84 | temp[1-3]_crit_alarm Chip temperature critical high alarm. | ||
85 | temp[1-3]_lowest Lowest measured temperature. LTC2978 only. | ||
86 | temp[1-3]_highest Highest measured temperature. | ||
87 | temp[1-3]_reset_history Reset history. Writing into this attribute will reset | ||
88 | history for all attributes. | ||
89 | |||
90 | power[1-2]_label "pout[1-2]". LTC3880 only. | ||
91 | power[1-2]_input Measured power. | ||
92 | |||
93 | curr1_label "iin". LTC3880 only. | ||
94 | curr1_input Measured input current. | ||
95 | curr1_max Maximum input current. | ||
96 | curr1_max_alarm Input current high alarm. | ||
97 | |||
98 | curr[2-3]_label "iout[1-2]". LTC3880 only. | ||
99 | curr[2-3]_input Measured input current. | ||
100 | curr[2-3]_max Maximum input current. | ||
101 | curr[2-3]_crit Critical input current. | ||
102 | curr[2-3]_max_alarm Input current high alarm. | ||
103 | curr[2-3]_crit_alarm Input current critical high alarm. | ||