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max17050: Be explicit about hardcoded calculations
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@ -26,6 +26,8 @@
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#include <soc/i2c.h>
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#include <utils/util.h>
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#define BASE_SNS_UOHM 5000
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/* Status register bits */
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#define STATUS_POR_BIT BIT(1)
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#define STATUS_BST_BIT BIT(3)
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@ -85,31 +87,31 @@ int max17050_get_property(enum MAX17050_reg reg, int *value)
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break;
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case MAX17050_VCELL: // Voltage now.
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data = max17050_get_reg(MAX17050_VCELL);
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*value = data * 625 / 8 / 1000;
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*value = (data >> 3) * 625 / 1000; /* Units of LSB = 0.625mV */
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battery_voltage = *value;
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break;
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case MAX17050_AvgVCELL: // Voltage avg.
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data = max17050_get_reg(MAX17050_AvgVCELL);
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*value = data * 625 / 8 / 1000;
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*value = (data >> 3) * 625 / 1000; /* Units of LSB = 0.625mV */
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break;
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case MAX17050_OCVInternal: // Voltage ocv.
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data = max17050_get_reg(MAX17050_OCVInternal);
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*value = data * 625 / 8 / 1000;
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*value = (data >> 3) * 625 / 1000; /* Units of LSB = 0.625mV */
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break;
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case MAX17050_RepSOC: // Capacity %.
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*value = max17050_get_reg(MAX17050_RepSOC);
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break;
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case MAX17050_DesignCap: // Charge full design.
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data = max17050_get_reg(MAX17050_DesignCap);
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*value = data * 5 / 10;
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*value = data * (BASE_SNS_UOHM / MAX17050_BOARD_SNS_RESISTOR_UOHM) / MAX17050_BOARD_CGAIN;
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break;
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case MAX17050_FullCAP: // Charge full.
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data = max17050_get_reg(MAX17050_FullCAP);
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*value = data * 5 / 10;
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*value = data * (BASE_SNS_UOHM / MAX17050_BOARD_SNS_RESISTOR_UOHM) / MAX17050_BOARD_CGAIN;
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break;
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case MAX17050_RepCap: // Charge now.
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data = max17050_get_reg(MAX17050_RepCap);
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*value = data * 5 / 10;
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*value = data * (BASE_SNS_UOHM / MAX17050_BOARD_SNS_RESISTOR_UOHM) / MAX17050_BOARD_CGAIN;
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break;
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case MAX17050_TEMP: // Temp.
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data = max17050_get_reg(MAX17050_TEMP);
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@ -119,12 +121,12 @@ int max17050_get_property(enum MAX17050_reg reg, int *value)
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case MAX17050_Current: // Current now.
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data = max17050_get_reg(MAX17050_Current);
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*value = (s16)data;
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*value *= 1562500 / MAX17050_DEFAULT_SNS_RESISTOR;
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*value *= 1562500 / (MAX17050_BOARD_SNS_RESISTOR_UOHM * MAX17050_BOARD_CGAIN);
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break;
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case MAX17050_AvgCurrent: // Current avg.
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data = max17050_get_reg(MAX17050_AvgCurrent);
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*value = (s16)data;
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*value *= 1562500 / MAX17050_DEFAULT_SNS_RESISTOR;
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*value *= 1562500 / (MAX17050_BOARD_SNS_RESISTOR_UOHM * MAX17050_BOARD_CGAIN);
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break;
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default:
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return -1;
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@ -25,8 +25,11 @@
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#include <utils/types.h>
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#define MAX17050_STATUS_BattAbsent BIT(3)
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#define MAX17050_DEFAULT_SNS_RESISTOR 10000
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/* Board default values */
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#define MAX17050_BOARD_CGAIN 2 /* Actual: 1.99993 */
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#define MAX17050_BOARD_SNS_RESISTOR_UOHM 5000 /* 0.005 Ohm */
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#define MAX17050_STATUS_BattAbsent BIT(3)
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/* Consider RepCap which is less then 10 units below FullCAP full */
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#define MAX17050_FULL_THRESHOLD 10
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