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