| Guenter Roeck | 69e1ded | 2014-01-11 00:17:05 -0800 | [diff] [blame] | 1 | Kernel driver ltc4260 |
| 2 | ===================== |
| 3 | |
| 4 | Supported chips: |
| Mauro Carvalho Chehab | b04f2f7 | 2019-04-17 06:46:28 -0300 | [diff] [blame] | 5 | |
| Guenter Roeck | 69e1ded | 2014-01-11 00:17:05 -0800 | [diff] [blame] | 6 | * Linear Technology LTC4260 |
| Mauro Carvalho Chehab | b04f2f7 | 2019-04-17 06:46:28 -0300 | [diff] [blame] | 7 | |
| Guenter Roeck | 69e1ded | 2014-01-11 00:17:05 -0800 | [diff] [blame] | 8 | Prefix: 'ltc4260' |
| Mauro Carvalho Chehab | b04f2f7 | 2019-04-17 06:46:28 -0300 | [diff] [blame] | 9 | |
| Guenter Roeck | 69e1ded | 2014-01-11 00:17:05 -0800 | [diff] [blame] | 10 | Addresses scanned: - |
| Mauro Carvalho Chehab | b04f2f7 | 2019-04-17 06:46:28 -0300 | [diff] [blame] | 11 | |
| Guenter Roeck | 69e1ded | 2014-01-11 00:17:05 -0800 | [diff] [blame] | 12 | Datasheet: |
| Mauro Carvalho Chehab | b04f2f7 | 2019-04-17 06:46:28 -0300 | [diff] [blame] | 13 | |
| 14 | http://cds.linear.com/docs/en/datasheet/4260fc.pdf |
| Guenter Roeck | 69e1ded | 2014-01-11 00:17:05 -0800 | [diff] [blame] | 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 |
| Mauro Carvalho Chehab | b04f2f7 | 2019-04-17 06:46:28 -0300 | [diff] [blame] | 34 | on I2C bus #1:: |
| 35 | |
| 36 | $ modprobe ltc4260 |
| 37 | $ echo ltc4260 0x10 > /sys/bus/i2c/devices/i2c-1/new_device |
| Guenter Roeck | 69e1ded | 2014-01-11 00:17:05 -0800 | [diff] [blame] | 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 | |
| Mauro Carvalho Chehab | b04f2f7 | 2019-04-17 06:46:28 -0300 | [diff] [blame] | 54 | ======================= ======================= |
| Guenter Roeck | 69e1ded | 2014-01-11 00:17:05 -0800 | [diff] [blame] | 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 |
| Mauro Carvalho Chehab | b04f2f7 | 2019-04-17 06:46:28 -0300 | [diff] [blame] | 64 | ======================= ======================= |