blob: c4ff4ad998b2f003d3302f6efb852ecb7a3f23cf [file] [log] [blame]
Guenter Roeck69e1ded2014-01-11 00:17:05 -08001Kernel driver ltc4260
2=====================
3
4Supported chips:
5 * Linear Technology LTC4260
6 Prefix: 'ltc4260'
7 Addresses scanned: -
8 Datasheet:
9 http://cds.linear.com/docs/en/datasheet/4260fc.pdf
10
11Author: Guenter Roeck <linux@roeck-us.net>
12
13
14Description
15-----------
16
17The LTC4260 Hot Swap controller allows a board to be safely inserted
18and removed from a live backplane.
19
20
21Usage Notes
22-----------
23
24This driver does not probe for LTC4260 devices, since there is no register
25which can be safely used to identify the chip. You will have to instantiate
26the devices explicitly.
27
28Example: the following will load the driver for an LTC4260 at address 0x10
29on I2C bus #1:
30$ modprobe ltc4260
31$ echo ltc4260 0x10 > /sys/bus/i2c/devices/i2c-1/new_device
32
33
34Sysfs entries
35-------------
36
37Voltage readings provided by this driver are reported as obtained from the ADC
38registers. If a set of voltage divider resistors is installed, calculate the
39real voltage by multiplying the reported value with (R1+R2)/R2, where R1 is the
40value of the divider resistor against the measured voltage and R2 is the value
41of the divider resistor against Ground.
42
43Current reading provided by this driver is reported as obtained from the ADC
44Current Sense register. The reported value assumes that a 1 mOhm sense resistor
45is installed. If a different sense resistor is installed, calculate the real
46current by dividing the reported value by the sense resistor value in mOhm.
47
48in1_input SOURCE voltage (mV)
49in1_min_alarm Undervoltage alarm
50in1_max_alarm Overvoltage alarm
51
52in2_input ADIN voltage (mV)
53in2_alarm Power bad alarm
54
55curr1_input SENSE current (mA)
56curr1_alarm SENSE overcurrent alarm