projects / mirror_ubuntu-artful-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| 69e1ded6 GR |
1 | Kernel driver ltc4260 |
| 2 | ===================== | |
| 3 | ||
| 4 | Supported chips: | |
| 5 | * Linear Technology LTC4260 | |
| 6 | Prefix: 'ltc4260' | |
| 7 | Addresses scanned: - | |
| 8 | Datasheet: | |
| 9 | http://cds.linear.com/docs/en/datasheet/4260fc.pdf | |
| 10 | ||
| 11 | Author: Guenter Roeck <linux@roeck-us.net> | |
| 12 | ||
| 13 | ||
| 14 | Description | |
| 15 | ----------- | |
| 16 | ||
| 17 | The LTC4260 Hot Swap controller allows a board to be safely inserted | |
| 18 | and removed from a live backplane. | |
| 19 | ||
| 20 | ||
| 21 | Usage Notes | |
| 22 | ----------- | |
| 23 | ||
| 24 | This driver does not probe for LTC4260 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 LTC4260 at address 0x10 | |
| 29 | on I2C bus #1: | |
| 30 | $ modprobe ltc4260 | |
| 31 | $ echo ltc4260 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 | in1_input SOURCE voltage (mV) | |
| 49 | in1_min_alarm Undervoltage alarm | |
| 50 | in1_max_alarm Overvoltage alarm | |
| 51 | ||
| 52 | in2_input ADIN voltage (mV) | |
| 53 | in2_alarm Power bad alarm | |
| 54 | ||
| 55 | curr1_input SENSE current (mA) | |
| 56 | curr1_alarm SENSE overcurrent alarm |