git://bbs.cooldavid.org / net-next-2.6.git / blame
| Commit | Line | Data |
|---|---|---|
| 6e34b187 IS |
1 | Kernel driver ltc4245 |
| 2 | ===================== | |
| 3 | ||
| 4 | Supported chips: | |
| 5 | * Linear Technology LTC4245 | |
| 6 | Prefix: 'ltc4245' | |
| 7 | Addresses scanned: 0x20-0x3f | |
| 8 | Datasheet: | |
| 9 | http://www.linear.com/pc/downloadDocument.do?navId=H0,C1,C1003,C1006,C1140,P19392,D13517 | |
| 10 | ||
| 11 | Author: Ira W. Snyder <iws@ovro.caltech.edu> | |
| 12 | ||
| 13 | ||
| 14 | Description | |
| 15 | ----------- | |
| 16 | ||
| 17 | The LTC4245 controller allows a board to be safely inserted and removed | |
| 18 | from a live backplane in multiple supply systems such as CompactPCI and | |
| 19 | PCI Express. | |
| 20 | ||
| 21 | ||
| 22 | Usage Notes | |
| 23 | ----------- | |
| 24 | ||
| 25 | This driver does not probe for LTC4245 devices, due to the fact that some | |
| 2d2a7cff JD |
26 | of the possible addresses are unfriendly to probing. You will have to |
| 27 | instantiate the devices explicitly. | |
| 6e34b187 IS |
28 | |
| 29 | Example: the following will load the driver for an LTC4245 at address 0x23 | |
| 30 | on I2C bus #1: | |
| 2d2a7cff JD |
31 | $ modprobe ltc4245 |
| 32 | $ echo ltc4245 0x23 > /sys/bus/i2c/devices/i2c-1/new_device | |
| 6e34b187 IS |
33 | |
| 34 | ||
| 35 | Sysfs entries | |
| 36 | ------------- | |
| 37 | ||
| 38 | The LTC4245 has built-in limits for over and under current warnings. This | |
| 39 | makes it very likely that the reference circuit will be used. | |
| 40 | ||
| 41 | This driver uses the values in the datasheet to change the register values | |
| 42 | into the values specified in the sysfs-interface document. The current readings | |
| 43 | rely on the sense resistors listed in Table 2: "Sense Resistor Values". | |
| 44 | ||
| 45 | in1_input 12v input voltage (mV) | |
| 46 | in2_input 5v input voltage (mV) | |
| 47 | in3_input 3v input voltage (mV) | |
| 48 | in4_input Vee (-12v) input voltage (mV) | |
| 49 | ||
| 50 | in1_min_alarm 12v input undervoltage alarm | |
| 51 | in2_min_alarm 5v input undervoltage alarm | |
| 52 | in3_min_alarm 3v input undervoltage alarm | |
| 53 | in4_min_alarm Vee (-12v) input undervoltage alarm | |
| 54 | ||
| 55 | curr1_input 12v current (mA) | |
| 56 | curr2_input 5v current (mA) | |
| 57 | curr3_input 3v current (mA) | |
| 58 | curr4_input Vee (-12v) current (mA) | |
| 59 | ||
| 60 | curr1_max_alarm 12v overcurrent alarm | |
| 61 | curr2_max_alarm 5v overcurrent alarm | |
| 62 | curr3_max_alarm 3v overcurrent alarm | |
| 63 | curr4_max_alarm Vee (-12v) overcurrent alarm | |
| 64 | ||
| 65 | in5_input 12v output voltage (mV) | |
| 66 | in6_input 5v output voltage (mV) | |
| 67 | in7_input 3v output voltage (mV) | |
| 68 | in8_input Vee (-12v) output voltage (mV) | |
| 69 | ||
| 70 | in5_min_alarm 12v output undervoltage alarm | |
| 71 | in6_min_alarm 5v output undervoltage alarm | |
| 72 | in7_min_alarm 3v output undervoltage alarm | |
| 73 | in8_min_alarm Vee (-12v) output undervoltage alarm | |
| 74 | ||
| df16dd53 | 75 | in9_input GPIO voltage data |
| 6e34b187 IS |
76 | |
| 77 | power1_input 12v power usage (mW) | |
| 78 | power2_input 5v power usage (mW) | |
| 79 | power3_input 3v power usage (mW) | |
| 80 | power4_input Vee (-12v) power usage (mW) |