1 Kernel driver ltc4261 2 ===================== 3 4 Supported chips: 5 6 * Linear Technology LTC4261 7 8 Prefix: 'ltc4261' 9 10 Addresses scanned: - 11 12 Datasheet: 13 14 http://cds.linear.com/docs/Datasheet/42612fb.pdf 15 16 Author: Guenter Roeck <linux@roeck-us.net> 17 18 19 Description 20 ----------- 21 22 The LTC4261/LTC4261-2 negative voltage Hot Swap controllers allow a board 23 to be safely inserted and removed from a live backplane. 24 25 26 Usage Notes 27 ----------- 28 29 This driver does not probe for LTC4261 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 LTC4261 at address 0x10 34 on I2C bus #1:: 35 36 $ modprobe ltc4261 37 $ echo ltc4261 0x10 > /sys/bus/i2c/devices/i2c-1/new_device 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 54 The chip has two voltage sensors, but only one set of voltage alarm status bits. 55 In many many designs, those alarms are associated with the ADIN2 sensor, due to 56 the proximity of the ADIN2 pin to the OV pin. ADIN2 is, however, not available 57 on all chip variants. To ensure that the alarm condition is reported to the user, 58 report it with both voltage sensors. 59 60 ======================= ============================= 61 in1_input ADIN2 voltage (mV) 62 in1_min_alarm ADIN/ADIN2 Undervoltage alarm 63 in1_max_alarm ADIN/ADIN2 Overvoltage alarm 64 65 in2_input ADIN voltage (mV) 66 in2_min_alarm ADIN/ADIN2 Undervoltage alarm 67 in2_max_alarm ADIN/ADIN2 Overvoltage alarm 68 69 curr1_input SENSE current (mA) 70 curr1_alarm SENSE overcurrent alarm 71 ======================= =============================
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