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Commit | Line | Data |
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c3ff9a67 GR |
1 | Kernel driver ltc2978 |
2 | ===================== | |
3 | ||
4 | Supported chips: | |
fd9175d2 GR |
5 | * Linear Technology LTC2974 |
6 | Prefix: 'ltc2974' | |
7 | Addresses scanned: - | |
8 | Datasheet: http://www.linear.com/product/ltc2974 | |
c3ff9a67 GR |
9 | * Linear Technology LTC2978 |
10 | Prefix: 'ltc2978' | |
11 | Addresses scanned: - | |
6d21a416 | 12 | Datasheet: http://www.linear.com/product/ltc2978 |
ddfb41ca GR |
13 | * Linear Technology LTC3880 |
14 | Prefix: 'ltc3880' | |
15 | Addresses scanned: - | |
6d21a416 | 16 | Datasheet: http://www.linear.com/product/ltc3880 |
fd9175d2 GR |
17 | * Linear Technology LTC3883 |
18 | Prefix: 'ltc3883' | |
19 | Addresses scanned: - | |
20 | Datasheet: http://www.linear.com/product/ltc3883 | |
c3ff9a67 | 21 | |
e3333e57 | 22 | Author: Guenter Roeck <linux@roeck-us.net> |
c3ff9a67 GR |
23 | |
24 | ||
25 | Description | |
26 | ----------- | |
27 | ||
fd9175d2 GR |
28 | LTC2974 is a quad digital power supply manager. LTC2978 is an octal power supply |
29 | monitor. LTC3880 is a dual output poly-phase step-down DC/DC controller. LTC3883 | |
30 | is a single phase step-down DC/DC controller. | |
c3ff9a67 GR |
31 | |
32 | ||
33 | Usage Notes | |
34 | ----------- | |
35 | ||
36 | This driver does not probe for PMBus devices. You will have to instantiate | |
37 | devices explicitly. | |
38 | ||
39 | Example: the following commands will load the driver for an LTC2978 at address | |
40 | 0x60 on I2C bus #1: | |
41 | ||
42 | # modprobe ltc2978 | |
43 | # echo ltc2978 0x60 > /sys/bus/i2c/devices/i2c-1/new_device | |
44 | ||
45 | ||
46 | Sysfs attributes | |
47 | ---------------- | |
48 | ||
49 | in1_label "vin" | |
50 | in1_input Measured input voltage. | |
51 | in1_min Minimum input voltage. | |
fd9175d2 GR |
52 | in1_max Maximum input voltage. LTC2974 and LTC2978 only. |
53 | in1_lcrit Critical minimum input voltage. LTC2974 and LTC2978 | |
54 | only. | |
c3ff9a67 GR |
55 | in1_crit Critical maximum input voltage. |
56 | in1_min_alarm Input voltage low alarm. | |
fd9175d2 GR |
57 | in1_max_alarm Input voltage high alarm. LTC2974 and LTC2978 only. |
58 | in1_lcrit_alarm Input voltage critical low alarm. LTC2974 and LTC2978 | |
59 | only. | |
c3ff9a67 | 60 | in1_crit_alarm Input voltage critical high alarm. |
fd9175d2 | 61 | in1_lowest Lowest input voltage. LTC2974 and LTC2978 only. |
c3ff9a67 | 62 | in1_highest Highest input voltage. |
8c770f3a | 63 | in1_reset_history Reset input voltage history. |
c3ff9a67 | 64 | |
fd9175d2 GR |
65 | in[N]_label "vout[1-8]". |
66 | LTC2974: N=2-5 | |
67 | LTC2978: N=2-9 | |
68 | LTC3880: N=2-3 | |
69 | LTC3883: N=2 | |
70 | in[N]_input Measured output voltage. | |
71 | in[N]_min Minimum output voltage. | |
72 | in[N]_max Maximum output voltage. | |
73 | in[N]_lcrit Critical minimum output voltage. | |
74 | in[N]_crit Critical maximum output voltage. | |
75 | in[N]_min_alarm Output voltage low alarm. | |
76 | in[N]_max_alarm Output voltage high alarm. | |
77 | in[N]_lcrit_alarm Output voltage critical low alarm. | |
78 | in[N]_crit_alarm Output voltage critical high alarm. | |
79 | in[N]_lowest Lowest output voltage. LTC2974 and LTC2978 only. | |
80 | in[N]_highest Highest output voltage. | |
81 | in[N]_reset_history Reset output voltage history. | |
82 | ||
83 | temp[N]_input Measured temperature. | |
84 | On LTC2974, temp[1-4] report external temperatures, | |
85 | and temp5 reports the chip temperature. | |
ddfb41ca | 86 | On LTC2978, only one temperature measurement is |
8c770f3a | 87 | supported and reports the chip temperature. |
ddfb41ca | 88 | On LTC3880, temp1 and temp2 report external |
fd9175d2 GR |
89 | temperatures, and temp3 reports the chip temperature. |
90 | On LTC3883, temp1 reports an external temperature, | |
91 | and temp2 reports the chip temperature. | |
92 | temp[N]_min Mimimum temperature. LTC2974 and LTC2978 only. | |
93 | temp[N]_max Maximum temperature. | |
94 | temp[N]_lcrit Critical low temperature. | |
95 | temp[N]_crit Critical high temperature. | |
96 | temp[N]_min_alarm Temperature low alarm. LTC2974 and LTC2978 only. | |
97 | temp[N]_max_alarm Temperature high alarm. | |
98 | temp[N]_lcrit_alarm Temperature critical low alarm. | |
99 | temp[N]_crit_alarm Temperature critical high alarm. | |
100 | temp[N]_lowest Lowest measured temperature. LTC2974 and LTC2978 only. | |
101 | Not supported for chip temperature sensor on LTC2974. | |
102 | temp[N]_highest Highest measured temperature. Not supported for chip | |
103 | temperature sensor on LTC2974. | |
104 | temp[N]_reset_history Reset temperature history. Not supported for chip | |
105 | temperature sensor on LTC2974. | |
106 | ||
107 | power1_label "pin". LTC3883 only. | |
108 | power1_input Measured input power. | |
109 | ||
110 | power[N]_label "pout[1-4]". | |
111 | LTC2974: N=1-4 | |
112 | LTC2978: Not supported | |
113 | LTC3880: N=1-2 | |
114 | LTC3883: N=2 | |
115 | power[N]_input Measured output power. | |
116 | ||
117 | curr1_label "iin". LTC3880 and LTC3883 only. | |
ddfb41ca GR |
118 | curr1_input Measured input current. |
119 | curr1_max Maximum input current. | |
120 | curr1_max_alarm Input current high alarm. | |
fd9175d2 GR |
121 | curr1_highest Highest input current. LTC3883 only. |
122 | curr1_reset_history Reset input current history. LTC3883 only. | |
123 | ||
124 | curr[N]_label "iout[1-4]". | |
125 | LTC2974: N=1-4 | |
126 | LTC2978: not supported | |
127 | LTC3880: N=2-3 | |
128 | LTC3883: N=2 | |
129 | curr[N]_input Measured output current. | |
130 | curr[N]_max Maximum output current. | |
131 | curr[N]_crit Critical high output current. | |
132 | curr[N]_lcrit Critical low output current. LTC2974 only. | |
133 | curr[N]_max_alarm Output current high alarm. | |
134 | curr[N]_crit_alarm Output current critical high alarm. | |
135 | curr[N]_lcrit_alarm Output current critical low alarm. LTC2974 only. | |
136 | curr[N]_lowest Lowest output current. LTC2974 only. | |
137 | curr[N]_highest Highest output current. | |
138 | curr[N]_reset_history Reset output current history. |