Commit | Line | Data |
---|---|---|
69e1ded6 GR |
1 | Kernel driver ltc4260 |
2 | ===================== | |
3 | ||
4 | Supported chips: | |
5 | * Linear Technology LTC4260 | |
6 | Prefix: 'ltc4260' | |
7 | Addresses scanned: - | |
8 | Datasheet: | |
9 | http://cds.linear.com/docs/en/datasheet/4260fc.pdf | |
10 | ||
11 | Author: Guenter Roeck <linux@roeck-us.net> | |
12 | ||
13 | ||
14 | Description | |
15 | ----------- | |
16 | ||
17 | The LTC4260 Hot Swap controller allows a board to be safely inserted | |
18 | and removed from a live backplane. | |
19 | ||
20 | ||
21 | Usage Notes | |
22 | ----------- | |
23 | ||
24 | This driver does not probe for LTC4260 devices, since there is no register | |
25 | which can be safely used to identify the chip. You will have to instantiate | |
26 | the devices explicitly. | |
27 | ||
28 | Example: the following will load the driver for an LTC4260 at address 0x10 | |
29 | on I2C bus #1: | |
30 | $ modprobe ltc4260 | |
31 | $ echo ltc4260 0x10 > /sys/bus/i2c/devices/i2c-1/new_device | |
32 | ||
33 | ||
34 | Sysfs entries | |
35 | ------------- | |
36 | ||
37 | Voltage readings provided by this driver are reported as obtained from the ADC | |
38 | registers. If a set of voltage divider resistors is installed, calculate the | |
39 | real voltage by multiplying the reported value with (R1+R2)/R2, where R1 is the | |
40 | value of the divider resistor against the measured voltage and R2 is the value | |
41 | of the divider resistor against Ground. | |
42 | ||
43 | Current reading provided by this driver is reported as obtained from the ADC | |
44 | Current Sense register. The reported value assumes that a 1 mOhm sense resistor | |
45 | is installed. If a different sense resistor is installed, calculate the real | |
46 | current by dividing the reported value by the sense resistor value in mOhm. | |
47 | ||
48 | in1_input SOURCE voltage (mV) | |
49 | in1_min_alarm Undervoltage alarm | |
50 | in1_max_alarm Overvoltage alarm | |
51 | ||
52 | in2_input ADIN voltage (mV) | |
53 | in2_alarm Power bad alarm | |
54 | ||
55 | curr1_input SENSE current (mA) | |
56 | curr1_alarm SENSE overcurrent alarm |