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69e1ded6 GR |
1 | Kernel driver ltc4260 |
2 | ===================== | |
3 | ||
4 | Supported chips: | |
b04f2f7d | 5 | |
69e1ded6 | 6 | * Linear Technology LTC4260 |
b04f2f7d | 7 | |
69e1ded6 | 8 | Prefix: 'ltc4260' |
b04f2f7d | 9 | |
69e1ded6 | 10 | Addresses scanned: - |
b04f2f7d | 11 | |
69e1ded6 | 12 | Datasheet: |
b04f2f7d MCC |
13 | |
14 | http://cds.linear.com/docs/en/datasheet/4260fc.pdf | |
69e1ded6 GR |
15 | |
16 | Author: Guenter Roeck <linux@roeck-us.net> | |
17 | ||
18 | ||
19 | Description | |
20 | ----------- | |
21 | ||
22 | The LTC4260 Hot Swap controller allows a board to be safely inserted | |
23 | and removed from a live backplane. | |
24 | ||
25 | ||
26 | Usage Notes | |
27 | ----------- | |
28 | ||
29 | This driver does not probe for LTC4260 devices, since there is no register | |
30 | which can be safely used to identify the chip. You will have to instantiate | |
31 | the devices explicitly. | |
32 | ||
33 | Example: the following will load the driver for an LTC4260 at address 0x10 | |
b04f2f7d MCC |
34 | on I2C bus #1:: |
35 | ||
36 | $ modprobe ltc4260 | |
37 | $ echo ltc4260 0x10 > /sys/bus/i2c/devices/i2c-1/new_device | |
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38 | |
39 | ||
40 | Sysfs entries | |
41 | ------------- | |
42 | ||
43 | Voltage readings provided by this driver are reported as obtained from the ADC | |
44 | registers. If a set of voltage divider resistors is installed, calculate the | |
45 | real voltage by multiplying the reported value with (R1+R2)/R2, where R1 is the | |
46 | value of the divider resistor against the measured voltage and R2 is the value | |
47 | of the divider resistor against Ground. | |
48 | ||
49 | Current reading provided by this driver is reported as obtained from the ADC | |
50 | Current Sense register. The reported value assumes that a 1 mOhm sense resistor | |
51 | is installed. If a different sense resistor is installed, calculate the real | |
52 | current by dividing the reported value by the sense resistor value in mOhm. | |
53 | ||
b04f2f7d | 54 | ======================= ======================= |
69e1ded6 GR |
55 | in1_input SOURCE voltage (mV) |
56 | in1_min_alarm Undervoltage alarm | |
57 | in1_max_alarm Overvoltage alarm | |
58 | ||
59 | in2_input ADIN voltage (mV) | |
60 | in2_alarm Power bad alarm | |
61 | ||
62 | curr1_input SENSE current (mA) | |
63 | curr1_alarm SENSE overcurrent alarm | |
b04f2f7d | 64 | ======================= ======================= |