projects / mirror_ubuntu-kernels.git / blame
| Commit | Line | Data |
|---|---|---|
| 69e1ded6 GR |
1 | Kernel driver ltc4260 |
| 2 | ===================== | |
| 3 | ||
| 4 | Supported chips: | |
| b04f2f7d | 5 | |
| 69e1ded6 | 6 | * Linear Technology LTC4260 |
| b04f2f7d | 7 | |
| 69e1ded6 | 8 | Prefix: 'ltc4260' |
| b04f2f7d | 9 | |
| 69e1ded6 | 10 | Addresses scanned: - |
| b04f2f7d | 11 | |
| 69e1ded6 | 12 | Datasheet: |
| b04f2f7d MCC |
13 | |
| 14 | http://cds.linear.com/docs/en/datasheet/4260fc.pdf | |
| 69e1ded6 GR |
15 | |
| 16 | Author: Guenter Roeck <linux@roeck-us.net> | |
| 17 | ||
| 18 | ||
| 19 | Description | |
| 20 | ----------- | |
| 21 | ||
| 22 | The LTC4260 Hot Swap controller allows a board to be safely inserted | |
| 23 | and removed from a live backplane. | |
| 24 | ||
| 25 | ||
| 26 | Usage Notes | |
| 27 | ----------- | |
| 28 | ||
| 29 | This driver does not probe for LTC4260 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 LTC4260 at address 0x10 | |
| b04f2f7d MCC |
34 | on I2C bus #1:: |
| 35 | ||
| 36 | $ modprobe ltc4260 | |
| 37 | $ echo ltc4260 0x10 > /sys/bus/i2c/devices/i2c-1/new_device | |
| 69e1ded6 GR |
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 | ||
| b04f2f7d | 54 | ======================= ======================= |
| 69e1ded6 GR |
55 | in1_input SOURCE voltage (mV) |
| 56 | in1_min_alarm Undervoltage alarm | |
| 57 | in1_max_alarm Overvoltage alarm | |
| 58 | ||
| 59 | in2_input ADIN voltage (mV) | |
| 60 | in2_alarm Power bad alarm | |
| 61 | ||
| 62 | curr1_input SENSE current (mA) | |
| 63 | curr1_alarm SENSE overcurrent alarm | |
| b04f2f7d | 64 | ======================= ======================= |