| Nuno Sá | 9f90fd6 | 2019-10-21 17:41:14 +0200 | [diff] [blame] | 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 <nuno.sa@analog.com> |
| 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 | ======================= ========================================== |