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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 |
bf89386f GR |
22 | * Linear Technology LTC3882 |
23 | Prefix: 'ltc3882' | |
24 | Addresses scanned: - | |
25 | Datasheet: http://www.linear.com/product/ltc3882 | |
fd9175d2 GR |
26 | * Linear Technology LTC3883 |
27 | Prefix: 'ltc3883' | |
28 | Addresses scanned: - | |
29 | Datasheet: http://www.linear.com/product/ltc3883 | |
f76992b0 GR |
30 | * Linear Technology LTM4676 |
31 | Prefix: 'ltm4676' | |
32 | Addresses scanned: - | |
33 | Datasheet: http://www.linear.com/product/ltm4676 | |
c3ff9a67 | 34 | |
e3333e57 | 35 | Author: Guenter Roeck <linux@roeck-us.net> |
c3ff9a67 GR |
36 | |
37 | ||
38 | Description | |
39 | ----------- | |
40 | ||
bf89386f GR |
41 | LTC2974 is a quad digital power supply managers. |
42 | LTC2978 is an octal power supply monitor. | |
43 | LTC2977 is a pin compatible replacement for LTC2978. | |
44 | LTC3880 and LTC3882 are dual output poly-phase step-down DC/DC controllers. | |
45 | LTC3883 is a single phase step-down DC/DC controller. | |
46 | LTM4676 is a dual 13A or single 26A uModule regulator. | |
c3ff9a67 GR |
47 | |
48 | ||
49 | Usage Notes | |
50 | ----------- | |
51 | ||
52 | This driver does not probe for PMBus devices. You will have to instantiate | |
53 | devices explicitly. | |
54 | ||
55 | Example: the following commands will load the driver for an LTC2978 at address | |
56 | 0x60 on I2C bus #1: | |
57 | ||
58 | # modprobe ltc2978 | |
59 | # echo ltc2978 0x60 > /sys/bus/i2c/devices/i2c-1/new_device | |
60 | ||
61 | ||
62 | Sysfs attributes | |
63 | ---------------- | |
64 | ||
65 | in1_label "vin" | |
66 | in1_input Measured input voltage. | |
67 | in1_min Minimum input voltage. | |
c24c407e GR |
68 | in1_max Maximum input voltage. |
69 | LTC2974, LTC2977, and LTC2978 only. | |
70 | in1_lcrit Critical minimum input voltage. | |
71 | LTC2974, LTC2977, and LTC2978 only. | |
c3ff9a67 GR |
72 | in1_crit Critical maximum input voltage. |
73 | in1_min_alarm Input voltage low alarm. | |
c24c407e GR |
74 | in1_max_alarm Input voltage high alarm. |
75 | LTC2974, LTC2977, and LTC2978 only. | |
76 | in1_lcrit_alarm Input voltage critical low alarm. | |
77 | LTC2974, LTC2977, and LTC2978 only. | |
c3ff9a67 | 78 | in1_crit_alarm Input voltage critical high alarm. |
c24c407e GR |
79 | in1_lowest Lowest input voltage. |
80 | LTC2974, LTC2977, and LTC2978 only. | |
c3ff9a67 | 81 | in1_highest Highest input voltage. |
8c770f3a | 82 | in1_reset_history Reset input voltage history. |
c3ff9a67 | 83 | |
fd9175d2 GR |
84 | in[N]_label "vout[1-8]". |
85 | LTC2974: N=2-5 | |
c24c407e | 86 | LTC2977: N=2-9 |
fd9175d2 | 87 | LTC2978: N=2-9 |
bf89386f | 88 | LTC3880, LTC3882, LTM4676: N=2-3 |
fd9175d2 GR |
89 | LTC3883: N=2 |
90 | in[N]_input Measured output voltage. | |
91 | in[N]_min Minimum output voltage. | |
92 | in[N]_max Maximum output voltage. | |
93 | in[N]_lcrit Critical minimum output voltage. | |
94 | in[N]_crit Critical maximum output voltage. | |
95 | in[N]_min_alarm Output voltage low alarm. | |
96 | in[N]_max_alarm Output voltage high alarm. | |
97 | in[N]_lcrit_alarm Output voltage critical low alarm. | |
98 | in[N]_crit_alarm Output voltage critical high alarm. | |
99 | in[N]_lowest Lowest output voltage. LTC2974 and LTC2978 only. | |
100 | in[N]_highest Highest output voltage. | |
101 | in[N]_reset_history Reset output voltage history. | |
102 | ||
103 | temp[N]_input Measured temperature. | |
104 | On LTC2974, temp[1-4] report external temperatures, | |
105 | and temp5 reports the chip temperature. | |
c24c407e GR |
106 | On LTC2977 and LTC2978, only one temperature measurement |
107 | is supported and reports the chip temperature. | |
bf89386f GR |
108 | On LTC3880, LTC3882, and LTM4676, temp1 and temp2 |
109 | report external temperatures, and temp3 reports | |
110 | the chip temperature. | |
fd9175d2 GR |
111 | On LTC3883, temp1 reports an external temperature, |
112 | and temp2 reports the chip temperature. | |
c24c407e | 113 | temp[N]_min Mimimum temperature. LTC2974, LCT2977, and LTC2978 only. |
fd9175d2 GR |
114 | temp[N]_max Maximum temperature. |
115 | temp[N]_lcrit Critical low temperature. | |
116 | temp[N]_crit Critical high temperature. | |
c24c407e GR |
117 | temp[N]_min_alarm Temperature low alarm. |
118 | LTC2974, LTC2977, and LTC2978 only. | |
fd9175d2 GR |
119 | temp[N]_max_alarm Temperature high alarm. |
120 | temp[N]_lcrit_alarm Temperature critical low alarm. | |
121 | temp[N]_crit_alarm Temperature critical high alarm. | |
c24c407e GR |
122 | temp[N]_lowest Lowest measured temperature. |
123 | LTC2974, LTC2977, and LTC2978 only. | |
fd9175d2 GR |
124 | Not supported for chip temperature sensor on LTC2974. |
125 | temp[N]_highest Highest measured temperature. Not supported for chip | |
126 | temperature sensor on LTC2974. | |
127 | temp[N]_reset_history Reset temperature history. Not supported for chip | |
128 | temperature sensor on LTC2974. | |
129 | ||
130 | power1_label "pin". LTC3883 only. | |
131 | power1_input Measured input power. | |
132 | ||
133 | power[N]_label "pout[1-4]". | |
134 | LTC2974: N=1-4 | |
c24c407e | 135 | LTC2977: Not supported |
fd9175d2 | 136 | LTC2978: Not supported |
bf89386f | 137 | LTC3880, LTC3882, LTM4676: N=1-2 |
fd9175d2 GR |
138 | LTC3883: N=2 |
139 | power[N]_input Measured output power. | |
140 | ||
f76992b0 | 141 | curr1_label "iin". LTC3880, LTC3883, and LTM4676 only. |
ddfb41ca GR |
142 | curr1_input Measured input current. |
143 | curr1_max Maximum input current. | |
144 | curr1_max_alarm Input current high alarm. | |
fd9175d2 GR |
145 | curr1_highest Highest input current. LTC3883 only. |
146 | curr1_reset_history Reset input current history. LTC3883 only. | |
147 | ||
148 | curr[N]_label "iout[1-4]". | |
149 | LTC2974: N=1-4 | |
c24c407e | 150 | LTC2977: not supported |
fd9175d2 | 151 | LTC2978: not supported |
bf89386f | 152 | LTC3880, LTC3882, LTM4676: N=2-3 |
fd9175d2 GR |
153 | LTC3883: N=2 |
154 | curr[N]_input Measured output current. | |
155 | curr[N]_max Maximum output current. | |
156 | curr[N]_crit Critical high output current. | |
157 | curr[N]_lcrit Critical low output current. LTC2974 only. | |
158 | curr[N]_max_alarm Output current high alarm. | |
159 | curr[N]_crit_alarm Output current critical high alarm. | |
160 | curr[N]_lcrit_alarm Output current critical low alarm. LTC2974 only. | |
161 | curr[N]_lowest Lowest output current. LTC2974 only. | |
162 | curr[N]_highest Highest output current. | |
163 | curr[N]_reset_history Reset output current history. |