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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 | |
c24c407e GR |
9 | * Linear Technology LTC2977 |
10 | Prefix: 'ltc2977' | |
11 | Addresses scanned: - | |
12 | Datasheet: http://www.linear.com/product/ltc2977 | |
3f08d7f4 | 13 | * Linear Technology LTC2978, LTC2978A |
c3ff9a67 GR |
14 | Prefix: 'ltc2978' |
15 | Addresses scanned: - | |
6d21a416 | 16 | Datasheet: http://www.linear.com/product/ltc2978 |
3f08d7f4 | 17 | http://www.linear.com/product/ltc2978a |
ddfb41ca GR |
18 | * Linear Technology LTC3880 |
19 | Prefix: 'ltc3880' | |
20 | Addresses scanned: - | |
6d21a416 | 21 | Datasheet: http://www.linear.com/product/ltc3880 |
fd9175d2 GR |
22 | * Linear Technology LTC3883 |
23 | Prefix: 'ltc3883' | |
24 | Addresses scanned: - | |
25 | Datasheet: http://www.linear.com/product/ltc3883 | |
c3ff9a67 | 26 | |
e3333e57 | 27 | Author: Guenter Roeck <linux@roeck-us.net> |
c3ff9a67 GR |
28 | |
29 | ||
30 | Description | |
31 | ----------- | |
32 | ||
fd9175d2 | 33 | LTC2974 is a quad digital power supply manager. LTC2978 is an octal power supply |
c24c407e GR |
34 | monitor. LTC2977 is a pin compatible replacement for LTC2978. LTC3880 is a dual |
35 | output poly-phase step-down DC/DC controller. LTC3883 is a single phase | |
36 | step-down DC/DC controller. | |
c3ff9a67 GR |
37 | |
38 | ||
39 | Usage Notes | |
40 | ----------- | |
41 | ||
42 | This driver does not probe for PMBus devices. You will have to instantiate | |
43 | devices explicitly. | |
44 | ||
45 | Example: the following commands will load the driver for an LTC2978 at address | |
46 | 0x60 on I2C bus #1: | |
47 | ||
48 | # modprobe ltc2978 | |
49 | # echo ltc2978 0x60 > /sys/bus/i2c/devices/i2c-1/new_device | |
50 | ||
51 | ||
52 | Sysfs attributes | |
53 | ---------------- | |
54 | ||
55 | in1_label "vin" | |
56 | in1_input Measured input voltage. | |
57 | in1_min Minimum input voltage. | |
c24c407e GR |
58 | in1_max Maximum input voltage. |
59 | LTC2974, LTC2977, and LTC2978 only. | |
60 | in1_lcrit Critical minimum input voltage. | |
61 | LTC2974, LTC2977, and LTC2978 only. | |
c3ff9a67 GR |
62 | in1_crit Critical maximum input voltage. |
63 | in1_min_alarm Input voltage low alarm. | |
c24c407e GR |
64 | in1_max_alarm Input voltage high alarm. |
65 | LTC2974, LTC2977, and LTC2978 only. | |
66 | in1_lcrit_alarm Input voltage critical low alarm. | |
67 | LTC2974, LTC2977, and LTC2978 only. | |
c3ff9a67 | 68 | in1_crit_alarm Input voltage critical high alarm. |
c24c407e GR |
69 | in1_lowest Lowest input voltage. |
70 | LTC2974, LTC2977, and LTC2978 only. | |
c3ff9a67 | 71 | in1_highest Highest input voltage. |
8c770f3a | 72 | in1_reset_history Reset input voltage history. |
c3ff9a67 | 73 | |
fd9175d2 GR |
74 | in[N]_label "vout[1-8]". |
75 | LTC2974: N=2-5 | |
c24c407e | 76 | LTC2977: N=2-9 |
fd9175d2 GR |
77 | LTC2978: N=2-9 |
78 | LTC3880: N=2-3 | |
79 | LTC3883: N=2 | |
80 | in[N]_input Measured output voltage. | |
81 | in[N]_min Minimum output voltage. | |
82 | in[N]_max Maximum output voltage. | |
83 | in[N]_lcrit Critical minimum output voltage. | |
84 | in[N]_crit Critical maximum output voltage. | |
85 | in[N]_min_alarm Output voltage low alarm. | |
86 | in[N]_max_alarm Output voltage high alarm. | |
87 | in[N]_lcrit_alarm Output voltage critical low alarm. | |
88 | in[N]_crit_alarm Output voltage critical high alarm. | |
89 | in[N]_lowest Lowest output voltage. LTC2974 and LTC2978 only. | |
90 | in[N]_highest Highest output voltage. | |
91 | in[N]_reset_history Reset output voltage history. | |
92 | ||
93 | temp[N]_input Measured temperature. | |
94 | On LTC2974, temp[1-4] report external temperatures, | |
95 | and temp5 reports the chip temperature. | |
c24c407e GR |
96 | On LTC2977 and LTC2978, only one temperature measurement |
97 | is supported and reports the chip temperature. | |
ddfb41ca | 98 | On LTC3880, temp1 and temp2 report external |
fd9175d2 GR |
99 | temperatures, and temp3 reports the chip temperature. |
100 | On LTC3883, temp1 reports an external temperature, | |
101 | and temp2 reports the chip temperature. | |
c24c407e | 102 | temp[N]_min Mimimum temperature. LTC2974, LCT2977, and LTC2978 only. |
fd9175d2 GR |
103 | temp[N]_max Maximum temperature. |
104 | temp[N]_lcrit Critical low temperature. | |
105 | temp[N]_crit Critical high temperature. | |
c24c407e GR |
106 | temp[N]_min_alarm Temperature low alarm. |
107 | LTC2974, LTC2977, and LTC2978 only. | |
fd9175d2 GR |
108 | temp[N]_max_alarm Temperature high alarm. |
109 | temp[N]_lcrit_alarm Temperature critical low alarm. | |
110 | temp[N]_crit_alarm Temperature critical high alarm. | |
c24c407e GR |
111 | temp[N]_lowest Lowest measured temperature. |
112 | LTC2974, LTC2977, and LTC2978 only. | |
fd9175d2 GR |
113 | Not supported for chip temperature sensor on LTC2974. |
114 | temp[N]_highest Highest measured temperature. Not supported for chip | |
115 | temperature sensor on LTC2974. | |
116 | temp[N]_reset_history Reset temperature history. Not supported for chip | |
117 | temperature sensor on LTC2974. | |
118 | ||
119 | power1_label "pin". LTC3883 only. | |
120 | power1_input Measured input power. | |
121 | ||
122 | power[N]_label "pout[1-4]". | |
123 | LTC2974: N=1-4 | |
c24c407e | 124 | LTC2977: Not supported |
fd9175d2 GR |
125 | LTC2978: Not supported |
126 | LTC3880: N=1-2 | |
127 | LTC3883: N=2 | |
128 | power[N]_input Measured output power. | |
129 | ||
130 | curr1_label "iin". LTC3880 and LTC3883 only. | |
ddfb41ca GR |
131 | curr1_input Measured input current. |
132 | curr1_max Maximum input current. | |
133 | curr1_max_alarm Input current high alarm. | |
fd9175d2 GR |
134 | curr1_highest Highest input current. LTC3883 only. |
135 | curr1_reset_history Reset input current history. LTC3883 only. | |
136 | ||
137 | curr[N]_label "iout[1-4]". | |
138 | LTC2974: N=1-4 | |
c24c407e | 139 | LTC2977: not supported |
fd9175d2 GR |
140 | LTC2978: not supported |
141 | LTC3880: N=2-3 | |
142 | LTC3883: N=2 | |
143 | curr[N]_input Measured output current. | |
144 | curr[N]_max Maximum output current. | |
145 | curr[N]_crit Critical high output current. | |
146 | curr[N]_lcrit Critical low output current. LTC2974 only. | |
147 | curr[N]_max_alarm Output current high alarm. | |
148 | curr[N]_crit_alarm Output current critical high alarm. | |
149 | curr[N]_lcrit_alarm Output current critical low alarm. LTC2974 only. | |
150 | curr[N]_lowest Lowest output current. LTC2974 only. | |
151 | curr[N]_highest Highest output current. | |
152 | curr[N]_reset_history Reset output current history. |