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Based on kernel version 3.13. Page generated on 2014-01-20 22:03 EST.

1	Kernel driver ltc4261
2	=====================
3	
4	Supported chips:
5	  * Linear Technology LTC4261
6	    Prefix: 'ltc4261'
7	    Addresses scanned: -
8	    Datasheet:
9	        http://cds.linear.com/docs/Datasheet/42612fb.pdf
10	
11	Author: Guenter Roeck <linux@roeck-us.net>
12	
13	
14	Description
15	-----------
16	
17	The LTC4261/LTC4261-2 negative voltage Hot Swap controllers allow a board
18	to be safely inserted and removed from a live backplane.
19	
20	
21	Usage Notes
22	-----------
23	
24	This driver does not probe for LTC4261 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 LTC4261 at address 0x10
29	on I2C bus #1:
30	$ modprobe ltc4261
31	$ echo ltc4261 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	The chip has two voltage sensors, but only one set of voltage alarm status bits.
49	In many many designs, those alarms are associated with the ADIN2 sensor, due to
50	the proximity of the ADIN2 pin to the OV pin. ADIN2 is, however, not available
51	on all chip variants. To ensure that the alarm condition is reported to the user,
52	report it with both voltage sensors.
53	
54	in1_input		ADIN2 voltage (mV)
55	in1_min_alarm		ADIN/ADIN2 Undervoltage alarm
56	in1_max_alarm		ADIN/ADIN2 Overvoltage alarm
57	
58	in2_input		ADIN voltage (mV)
59	in2_min_alarm		ADIN/ADIN2 Undervoltage alarm
60	in2_max_alarm		ADIN/ADIN2 Overvoltage alarm
61	
62	curr1_input		SENSE current (mA)
63	curr1_alarm		SENSE overcurrent alarm
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