1 .. SPDX-License-Identifier: GPL-2.0-or-later 2 3 Kernel driver ltc4286 4 ===================== 5 6 Supported chips: 7 8 * Analog Devices LTC4286 9 10 Prefix: 'ltc4286' 11 12 Addresses scanned: - 13 14 Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/ltc4286.pdf 15 16 * Analog Devices LTC4287 17 18 Prefix: 'ltc4287' 19 20 Addresses scanned: - 21 22 Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/ltc4287.pdf 23 24 Author: Delphine CC Chiu <Delphine_CC_Chiu@Wiwynn.com> 25 26 27 Description 28 ----------- 29 30 This driver supports hardware monitoring for Analog Devices LTC4286 31 and LTC4287 Hot-Swap Controller and Digital Power Monitors. 32 33 LTC4286 and LTC4287 are hot-swap controllers that allow a circuit board 34 to be removed from or inserted into a live backplane. They also feature 35 current and voltage readback via an integrated 12 bit analog-to-digital 36 converter (ADC), accessed using a PMBus interface. 37 38 The driver is a client driver to the core PMBus driver. Please see 39 Documentation/hwmon/pmbus.rst for details on PMBus client drivers. 40 41 42 Usage Notes 43 ----------- 44 45 This driver does not auto-detect devices. You will have to instantiate the 46 devices explicitly. Please see Documentation/i2c/instantiating-devices.rst for 47 details. 48 49 The shunt value in micro-ohms can be set via device tree at compile-time. Please 50 refer to the Documentation/devicetree/bindings/hwmon/lltc,ltc4286.yaml for bindings 51 if the device tree is used. 52 53 54 Platform data support 55 --------------------- 56 57 The driver supports standard PMBus driver platform data. Please see 58 Documentation/hwmon/pmbus.rst for details. 59 60 61 Sysfs entries 62 ------------- 63 64 The following attributes are supported. Limits are read-write, history reset 65 attributes are write-only, all other attributes are read-only. 66 67 ======================= ======================================================= 68 in1_label "vin" 69 in1_input Measured voltage. 70 in1_alarm Input voltage alarm. 71 in1_min Minimum input voltage. 72 in1_max Maximum input voltage. 73 74 in2_label "vout1" 75 in2_input Measured voltage. 76 in2_alarm Output voltage alarm. 77 in2_min Minimum output voltage. 78 in2_max Maximum output voltage. 79 80 curr1_label "iout1" 81 curr1_input Measured current. 82 curr1_alarm Output current alarm. 83 curr1_max Maximum current. 84 85 power1_label "pin" 86 power1_input Input power. 87 power1_alarm Input power alarm. 88 power1_max Maximum poewr. 89 90 temp1_input Chip temperature. 91 temp1_min Minimum chip temperature. 92 temp1_max Maximum chip temperature. 93 temp1_crit Critical chip temperature. 94 temp1_alarm Chip temperature alarm. 95 ======================= =======================================================
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