diff options
Diffstat (limited to 'Documentation/hwmon/ltc4245')
-rw-r--r-- | Documentation/hwmon/ltc4245 | 81 |
1 files changed, 81 insertions, 0 deletions
diff --git a/Documentation/hwmon/ltc4245 b/Documentation/hwmon/ltc4245 new file mode 100644 index 000000000000..bae7a3adc5d8 --- /dev/null +++ b/Documentation/hwmon/ltc4245 | |||
@@ -0,0 +1,81 @@ | |||
1 | Kernel driver ltc4245 | ||
2 | ===================== | ||
3 | |||
4 | Supported chips: | ||
5 | * Linear Technology LTC4245 | ||
6 | Prefix: 'ltc4245' | ||
7 | Addresses scanned: 0x20-0x3f | ||
8 | Datasheet: | ||
9 | http://www.linear.com/pc/downloadDocument.do?navId=H0,C1,C1003,C1006,C1140,P19392,D13517 | ||
10 | |||
11 | Author: Ira W. Snyder <iws@ovro.caltech.edu> | ||
12 | |||
13 | |||
14 | Description | ||
15 | ----------- | ||
16 | |||
17 | The LTC4245 controller allows a board to be safely inserted and removed | ||
18 | from a live backplane in multiple supply systems such as CompactPCI and | ||
19 | PCI Express. | ||
20 | |||
21 | |||
22 | Usage Notes | ||
23 | ----------- | ||
24 | |||
25 | This driver does not probe for LTC4245 devices, due to the fact that some | ||
26 | of the possible addresses are unfriendly to probing. You will need to use | ||
27 | the "force" parameter to tell the driver where to find the device. | ||
28 | |||
29 | Example: the following will load the driver for an LTC4245 at address 0x23 | ||
30 | on I2C bus #1: | ||
31 | $ modprobe ltc4245 force=1,0x23 | ||
32 | |||
33 | |||
34 | Sysfs entries | ||
35 | ------------- | ||
36 | |||
37 | The LTC4245 has built-in limits for over and under current warnings. This | ||
38 | makes it very likely that the reference circuit will be used. | ||
39 | |||
40 | This driver uses the values in the datasheet to change the register values | ||
41 | into the values specified in the sysfs-interface document. The current readings | ||
42 | rely on the sense resistors listed in Table 2: "Sense Resistor Values". | ||
43 | |||
44 | in1_input 12v input voltage (mV) | ||
45 | in2_input 5v input voltage (mV) | ||
46 | in3_input 3v input voltage (mV) | ||
47 | in4_input Vee (-12v) input voltage (mV) | ||
48 | |||
49 | in1_min_alarm 12v input undervoltage alarm | ||
50 | in2_min_alarm 5v input undervoltage alarm | ||
51 | in3_min_alarm 3v input undervoltage alarm | ||
52 | in4_min_alarm Vee (-12v) input undervoltage alarm | ||
53 | |||
54 | curr1_input 12v current (mA) | ||
55 | curr2_input 5v current (mA) | ||
56 | curr3_input 3v current (mA) | ||
57 | curr4_input Vee (-12v) current (mA) | ||
58 | |||
59 | curr1_max_alarm 12v overcurrent alarm | ||
60 | curr2_max_alarm 5v overcurrent alarm | ||
61 | curr3_max_alarm 3v overcurrent alarm | ||
62 | curr4_max_alarm Vee (-12v) overcurrent alarm | ||
63 | |||
64 | in5_input 12v output voltage (mV) | ||
65 | in6_input 5v output voltage (mV) | ||
66 | in7_input 3v output voltage (mV) | ||
67 | in8_input Vee (-12v) output voltage (mV) | ||
68 | |||
69 | in5_min_alarm 12v output undervoltage alarm | ||
70 | in6_min_alarm 5v output undervoltage alarm | ||
71 | in7_min_alarm 3v output undervoltage alarm | ||
72 | in8_min_alarm Vee (-12v) output undervoltage alarm | ||
73 | |||
74 | in9_input GPIO #1 voltage data | ||
75 | in10_input GPIO #2 voltage data | ||
76 | in11_input GPIO #3 voltage data | ||
77 | |||
78 | power1_input 12v power usage (mW) | ||
79 | power2_input 5v power usage (mW) | ||
80 | power3_input 3v power usage (mW) | ||
81 | power4_input Vee (-12v) power usage (mW) | ||