projects / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 9f90fd65 NS |
1 | Kernel drivers ltc2947-i2c and ltc2947-spi |
| 2 | ========================================== | |
| 3 | ||
| 4 | Supported chips: | |
| 5 | ||
| 6 | * Analog Devices LTC2947 | |
| 7 | ||
| 8 | Prefix: 'ltc2947' | |
| 9 | ||
| 10 | Addresses scanned: - | |
| 11 | ||
| 12 | Datasheet: | |
| 13 | ||
| 14 | https://www.analog.com/media/en/technical-documentation/data-sheets/LTC2947.pdf | |
| 15 | ||
| 16 | Author: Nuno Sá <[email protected]> | |
| 17 | ||
| 18 | Description | |
| 19 | ___________ | |
| 20 | ||
| 21 | The LTC2947 is a high precision power and energy monitor that measures current, | |
| 22 | voltage, power, temperature, charge and energy. The device supports both SPI | |
| 23 | and I2C depending on the chip configuration. | |
| 24 | The device also measures accumulated quantities as energy. It has two banks of | |
| 25 | register's to read/set energy related values. These banks can be configured | |
| 26 | independently to have setups like: energy1 accumulates always and enrgy2 only | |
| 27 | accumulates if current is positive (to check battery charging efficiency for | |
| 28 | example). The device also supports a GPIO pin that can be configured as output | |
| 29 | to control a fan as a function of measured temperature. Then, the GPIO becomes | |
| 30 | active as soon as a temperature reading is higher than a defined threshold. The | |
| 31 | temp2 channel is used to control this thresholds and to read the respective | |
| 32 | alarms. | |
| 33 | ||
| 34 | Sysfs entries | |
| 35 | _____________ | |
| 36 | ||
| 37 | The following attributes are supported. Limits are read-write, reset_history | |
| 38 | is write-only and all the other attributes are read-only. | |
| 39 | ||
| 40 | ======================= ========================================== | |
| 41 | in0_input VP-VM voltage (mV). | |
| 42 | in0_min Undervoltage threshold | |
| 43 | in0_max Overvoltage threshold | |
| 44 | in0_lowest Lowest measured voltage | |
| 45 | in0_highest Highest measured voltage | |
| 46 | in0_reset_history Write 1 to reset in1 history | |
| 47 | in0_min_alarm Undervoltage alarm | |
| 48 | in0_max_alarm Overvoltage alarm | |
| 49 | in0_label Channel label (VP-VM) | |
| 50 | ||
| 51 | in1_input DVCC voltage (mV) | |
| 52 | in1_min Undervoltage threshold | |
| 53 | in1_max Overvoltage threshold | |
| 54 | in1_lowest Lowest measured voltage | |
| 55 | in1_highest Highest measured voltage | |
| 56 | in1_reset_history Write 1 to reset in2 history | |
| 57 | in1_min_alarm Undervoltage alarm | |
| 58 | in1_max_alarm Overvoltage alarm | |
| 59 | in1_label Channel label (DVCC) | |
| 60 | ||
| 61 | curr1_input IP-IM Sense current (mA) | |
| 62 | curr1_min Undercurrent threshold | |
| 63 | curr1_max Overcurrent threshold | |
| 64 | curr1_lowest Lowest measured current | |
| 65 | curr1_highest Highest measured current | |
| 66 | curr1_reset_history Write 1 to reset curr1 history | |
| 67 | curr1_min_alarm Undercurrent alarm | |
| 68 | curr1_max_alarm Overcurrent alarm | |
| 69 | curr1_label Channel label (IP-IM) | |
| 70 | ||
| 71 | power1_input Power (in uW) | |
| 72 | power1_min Low power threshold | |
| 73 | power1_max High power threshold | |
| 74 | power1_input_lowest Historical minimum power use | |
| 75 | power1_input_highest Historical maximum power use | |
| 76 | power1_reset_history Write 1 to reset power1 history | |
| 77 | power1_min_alarm Low power alarm | |
| 78 | power1_max_alarm High power alarm | |
| 79 | power1_label Channel label (Power) | |
| 80 | ||
| 81 | temp1_input Chip Temperature (in milliC) | |
| 82 | temp1_min Low temperature threshold | |
| 83 | temp1_max High temperature threshold | |
| 84 | temp1_input_lowest Historical minimum temperature use | |
| 85 | temp1_input_highest Historical maximum temperature use | |
| 86 | temp1_reset_history Write 1 to reset temp1 history | |
| 87 | temp1_min_alarm Low temperature alarm | |
| 88 | temp1_max_alarm High temperature alarm | |
| 89 | temp1_label Channel label (Ambient) | |
| 90 | ||
| 91 | temp2_min Low temperature threshold for fan control | |
| 92 | temp2_max High temperature threshold for fan control | |
| 93 | temp2_min_alarm Low temperature fan control alarm | |
| 94 | temp2_max_alarm High temperature fan control alarm | |
| 95 | temp2_label Channel label (TEMPFAN) | |
| 96 | ||
| 97 | energy1_input Measured energy over time (in microJoule) | |
| 98 | ||
| 99 | energy2_input Measured energy over time (in microJoule) | |
| 100 | ======================= ========================================== |