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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 | |
649ca820 GR |
9 | * Linear Technology LTC2975 |
10 | Prefix: 'ltc2975' | |
11 | Addresses scanned: - | |
12 | Datasheet: http://www.linear.com/product/ltc2975 | |
c24c407e GR |
13 | * Linear Technology LTC2977 |
14 | Prefix: 'ltc2977' | |
15 | Addresses scanned: - | |
16 | Datasheet: http://www.linear.com/product/ltc2977 | |
3f08d7f4 | 17 | * Linear Technology LTC2978, LTC2978A |
c3ff9a67 GR |
18 | Prefix: 'ltc2978' |
19 | Addresses scanned: - | |
6d21a416 | 20 | Datasheet: http://www.linear.com/product/ltc2978 |
3f08d7f4 | 21 | http://www.linear.com/product/ltc2978a |
52aae6af GR |
22 | * Linear Technology LTC2980 |
23 | Prefix: 'ltc2980' | |
24 | Addresses scanned: - | |
25 | Datasheet: http://www.linear.com/product/ltc2980 | |
ddfb41ca GR |
26 | * Linear Technology LTC3880 |
27 | Prefix: 'ltc3880' | |
28 | Addresses scanned: - | |
6d21a416 | 29 | Datasheet: http://www.linear.com/product/ltc3880 |
bf89386f GR |
30 | * Linear Technology LTC3882 |
31 | Prefix: 'ltc3882' | |
32 | Addresses scanned: - | |
33 | Datasheet: http://www.linear.com/product/ltc3882 | |
fd9175d2 GR |
34 | * Linear Technology LTC3883 |
35 | Prefix: 'ltc3883' | |
36 | Addresses scanned: - | |
37 | Datasheet: http://www.linear.com/product/ltc3883 | |
228b687d GR |
38 | * Linear Technology LTC3886 |
39 | Prefix: 'ltc3886' | |
40 | Addresses scanned: - | |
41 | Datasheet: http://www.linear.com/product/ltc3886 | |
15398566 GR |
42 | * Linear Technology LTC3887 |
43 | Prefix: 'ltc3887' | |
44 | Addresses scanned: - | |
45 | Datasheet: http://www.linear.com/product/ltc3887 | |
52aae6af GR |
46 | * Linear Technology LTM2987 |
47 | Prefix: 'ltm2987' | |
48 | Addresses scanned: - | |
49 | Datasheet: http://www.linear.com/product/ltm2987 | |
f76992b0 GR |
50 | * Linear Technology LTM4676 |
51 | Prefix: 'ltm4676' | |
52 | Addresses scanned: - | |
53 | Datasheet: http://www.linear.com/product/ltm4676 | |
c3ff9a67 | 54 | |
e3333e57 | 55 | Author: Guenter Roeck <linux@roeck-us.net> |
c3ff9a67 GR |
56 | |
57 | ||
58 | Description | |
59 | ----------- | |
60 | ||
649ca820 | 61 | LTC2974 and LTC2975 are quad digital power supply managers. |
bf89386f GR |
62 | LTC2978 is an octal power supply monitor. |
63 | LTC2977 is a pin compatible replacement for LTC2978. | |
52aae6af GR |
64 | LTC2980 is a 16-channel Power System Manager, consisting of two LTC2977 |
65 | in a single die. The chip is instantiated and reported as two separate chips | |
66 | on two different I2C bus addresses. | |
228b687d GR |
67 | LTC3880, LTC3882, LTC3886, and LTC3887 are dual output poly-phase step-down |
68 | DC/DC controllers. | |
bf89386f | 69 | LTC3883 is a single phase step-down DC/DC controller. |
52aae6af GR |
70 | LTM2987 is a 16-channel Power System Manager with two LTC2977 plus |
71 | additional components on a single die. The chip is instantiated and reported | |
72 | as two separate chips on two different I2C bus addresses. | |
bf89386f | 73 | LTM4676 is a dual 13A or single 26A uModule regulator. |
c3ff9a67 GR |
74 | |
75 | ||
76 | Usage Notes | |
77 | ----------- | |
78 | ||
79 | This driver does not probe for PMBus devices. You will have to instantiate | |
80 | devices explicitly. | |
81 | ||
82 | Example: the following commands will load the driver for an LTC2978 at address | |
83 | 0x60 on I2C bus #1: | |
84 | ||
85 | # modprobe ltc2978 | |
86 | # echo ltc2978 0x60 > /sys/bus/i2c/devices/i2c-1/new_device | |
87 | ||
88 | ||
89 | Sysfs attributes | |
90 | ---------------- | |
91 | ||
92 | in1_label "vin" | |
93 | in1_input Measured input voltage. | |
94 | in1_min Minimum input voltage. | |
c24c407e | 95 | in1_max Maximum input voltage. |
52aae6af GR |
96 | LTC2974, LTC2975, LTC2977, LTC2980, LTC2978, and |
97 | LTM2987 only. | |
c24c407e | 98 | in1_lcrit Critical minimum input voltage. |
52aae6af GR |
99 | LTC2974, LTC2975, LTC2977, LTC2980, LTC2978, and |
100 | LTM2987 only. | |
c3ff9a67 GR |
101 | in1_crit Critical maximum input voltage. |
102 | in1_min_alarm Input voltage low alarm. | |
c24c407e | 103 | in1_max_alarm Input voltage high alarm. |
52aae6af GR |
104 | LTC2974, LTC2975, LTC2977, LTC2980, LTC2978, and |
105 | LTM2987 only. | |
c24c407e | 106 | in1_lcrit_alarm Input voltage critical low alarm. |
52aae6af GR |
107 | LTC2974, LTC2975, LTC2977, LTC2980, LTC2978, and |
108 | LTM2987 only. | |
c3ff9a67 | 109 | in1_crit_alarm Input voltage critical high alarm. |
c24c407e | 110 | in1_lowest Lowest input voltage. |
52aae6af GR |
111 | LTC2974, LTC2975, LTC2977, LTC2980, LTC2978, and |
112 | LTM2987 only. | |
c3ff9a67 | 113 | in1_highest Highest input voltage. |
8c770f3a | 114 | in1_reset_history Reset input voltage history. |
c3ff9a67 | 115 | |
fd9175d2 | 116 | in[N]_label "vout[1-8]". |
649ca820 | 117 | LTC2974, LTC2975: N=2-5 |
52aae6af | 118 | LTC2977, LTC2980, LTM2987: N=2-9 |
fd9175d2 | 119 | LTC2978: N=2-9 |
228b687d | 120 | LTC3880, LTC3882, LTC23886 LTC3887, LTM4676: N=2-3 |
fd9175d2 GR |
121 | LTC3883: N=2 |
122 | in[N]_input Measured output voltage. | |
123 | in[N]_min Minimum output voltage. | |
124 | in[N]_max Maximum output voltage. | |
125 | in[N]_lcrit Critical minimum output voltage. | |
126 | in[N]_crit Critical maximum output voltage. | |
127 | in[N]_min_alarm Output voltage low alarm. | |
128 | in[N]_max_alarm Output voltage high alarm. | |
129 | in[N]_lcrit_alarm Output voltage critical low alarm. | |
130 | in[N]_crit_alarm Output voltage critical high alarm. | |
649ca820 GR |
131 | in[N]_lowest Lowest output voltage. LTC2974, LTC2975, |
132 | and LTC2978 only. | |
fd9175d2 GR |
133 | in[N]_highest Highest output voltage. |
134 | in[N]_reset_history Reset output voltage history. | |
135 | ||
136 | temp[N]_input Measured temperature. | |
649ca820 GR |
137 | On LTC2974 and LTC2975, temp[1-4] report external |
138 | temperatures, and temp5 reports the chip temperature. | |
52aae6af GR |
139 | On LTC2977, LTC2980, LTC2978, and LTM2987, only one |
140 | temperature measurement is supported and reports | |
141 | the chip temperature. | |
15398566 GR |
142 | On LTC3880, LTC3882, LTC3887, and LTM4676, temp1 and |
143 | temp2 report external temperatures, and temp3 reports | |
bf89386f | 144 | the chip temperature. |
fd9175d2 GR |
145 | On LTC3883, temp1 reports an external temperature, |
146 | and temp2 reports the chip temperature. | |
52aae6af GR |
147 | temp[N]_min Mimimum temperature. LTC2974, LCT2977, LTM2980, LTC2978, |
148 | and LTM2987 only. | |
fd9175d2 GR |
149 | temp[N]_max Maximum temperature. |
150 | temp[N]_lcrit Critical low temperature. | |
151 | temp[N]_crit Critical high temperature. | |
c24c407e | 152 | temp[N]_min_alarm Temperature low alarm. |
52aae6af GR |
153 | LTC2974, LTC2975, LTC2977, LTM2980, LTC2978, and |
154 | LTM2987 only. | |
fd9175d2 GR |
155 | temp[N]_max_alarm Temperature high alarm. |
156 | temp[N]_lcrit_alarm Temperature critical low alarm. | |
157 | temp[N]_crit_alarm Temperature critical high alarm. | |
c24c407e | 158 | temp[N]_lowest Lowest measured temperature. |
52aae6af GR |
159 | LTC2974, LTC2975, LTC2977, LTM2980, LTC2978, and |
160 | LTM2987 only. | |
649ca820 GR |
161 | Not supported for chip temperature sensor on LTC2974 and |
162 | LTC2975. | |
fd9175d2 | 163 | temp[N]_highest Highest measured temperature. Not supported for chip |
649ca820 | 164 | temperature sensor on LTC2974 and LTC2975. |
fd9175d2 | 165 | temp[N]_reset_history Reset temperature history. Not supported for chip |
649ca820 | 166 | temperature sensor on LTC2974 and LTC2975. |
fd9175d2 | 167 | |
228b687d | 168 | power1_label "pin". LTC3883 and LTC3886 only. |
fd9175d2 GR |
169 | power1_input Measured input power. |
170 | ||
171 | power[N]_label "pout[1-4]". | |
649ca820 | 172 | LTC2974, LTC2975: N=1-4 |
52aae6af | 173 | LTC2977, LTC2980, LTM2987: Not supported |
fd9175d2 | 174 | LTC2978: Not supported |
228b687d | 175 | LTC3880, LTC3882, LTC3886, LTC3887, LTM4676: N=1-2 |
fd9175d2 GR |
176 | LTC3883: N=2 |
177 | power[N]_input Measured output power. | |
178 | ||
228b687d GR |
179 | curr1_label "iin". LTC3880, LTC3883, LTC3886, LTC3887, and LTM4676 |
180 | only. | |
ddfb41ca GR |
181 | curr1_input Measured input current. |
182 | curr1_max Maximum input current. | |
183 | curr1_max_alarm Input current high alarm. | |
228b687d GR |
184 | curr1_highest Highest input current. LTC3883 and LTC3886 only. |
185 | curr1_reset_history Reset input current history. LTC3883 and LTC3886 only. | |
fd9175d2 GR |
186 | |
187 | curr[N]_label "iout[1-4]". | |
649ca820 | 188 | LTC2974, LTC2975: N=1-4 |
52aae6af | 189 | LTC2977, LTC2980, LTM2987: not supported |
fd9175d2 | 190 | LTC2978: not supported |
228b687d | 191 | LTC3880, LTC3882, LTC3886, LTC3887, LTM4676: N=2-3 |
fd9175d2 GR |
192 | LTC3883: N=2 |
193 | curr[N]_input Measured output current. | |
194 | curr[N]_max Maximum output current. | |
195 | curr[N]_crit Critical high output current. | |
649ca820 | 196 | curr[N]_lcrit Critical low output current. LTC2974 and LTC2975 only. |
fd9175d2 GR |
197 | curr[N]_max_alarm Output current high alarm. |
198 | curr[N]_crit_alarm Output current critical high alarm. | |
649ca820 GR |
199 | curr[N]_lcrit_alarm Output current critical low alarm. |
200 | LTC2974 and LTC2975 only. | |
201 | curr[N]_lowest Lowest output current. LTC2974 and LTC2975 only. | |
fd9175d2 GR |
202 | curr[N]_highest Highest output current. |
203 | curr[N]_reset_history Reset output current history. |