/* * 1-Wire implementation for Maxim Semiconductor * MAX7211/MAX17215 standalone fuel gauge chip * * Copyright (C) 2017 Radioavionica Corporation * Author: Alex A. Mihaylov <[email protected]> * * Use consistent with the GNU GPL is permitted, * provided that this copyright notice is * preserved in its entirety in all copies and derived works. * */ #include <linux/module.h> #include <linux/slab.h> #include <linux/w1.h> #include <linux/regmap.h> #include <linux/power_supply.h> #define W1_MAX1721X_FAMILY_ID … #define DEF_DEV_NAME_MAX17211 … #define DEF_DEV_NAME_MAX17215 … #define DEF_DEV_NAME_UNKNOWN … #define DEF_MFG_NAME … #define PSY_MAX_NAME_LEN … /* Number of valid register addresses in W1 mode */ #define MAX1721X_MAX_REG_NR … /* Factory settings (nonvolatile registers) (W1 specific) */ #define MAX1721X_REG_NRSENSE … /* Strings */ #define MAX1721X_REG_MFG_STR … #define MAX1721X_REG_MFG_NUMB … #define MAX1721X_REG_DEV_STR … #define MAX1721X_REG_DEV_NUMB … /* HEX Strings */ #define MAX1721X_REG_SER_HEX … /* MAX172XX Output Registers for W1 chips */ #define MAX172XX_REG_STATUS … #define MAX172XX_BAT_PRESENT … #define MAX172XX_REG_DEVNAME … #define MAX172XX_DEV_MASK … #define MAX172X1_DEV … #define MAX172X5_DEV … #define MAX172XX_REG_TEMP … #define MAX172XX_REG_BATT … #define MAX172XX_REG_CURRENT … #define MAX172XX_REG_AVGCURRENT … #define MAX172XX_REG_REPSOC … #define MAX172XX_REG_DESIGNCAP … #define MAX172XX_REG_REPCAP … #define MAX172XX_REG_TTE … #define MAX172XX_REG_TTF … struct max17211_device_info { … }; /* Convert regs value to power_supply units */ static inline int max172xx_time_to_ps(unsigned int reg) { … } static inline int max172xx_percent_to_ps(unsigned int reg) { … } static inline int max172xx_voltage_to_ps(unsigned int reg) { … } static inline int max172xx_capacity_to_ps(unsigned int reg) { … } /* * Current and temperature is signed values, so unsigned regs * value must be converted to signed type */ static inline int max172xx_temperature_to_ps(unsigned int reg) { … } /* * Calculating current registers resolution: * * RSense stored in 10^-5 Ohm, so measurement voltage must be * in 10^-11 Volts for get current in uA. * 16 bit current reg fullscale +/-51.2mV is 102400 uV. * So: 102400 / 65535 * 10^5 = 156252 */ static inline int max172xx_current_to_voltage(unsigned int reg) { … } static inline struct max17211_device_info * to_device_info(struct power_supply *psy) { … } static int max1721x_battery_get_property(struct power_supply *psy, enum power_supply_property psp, union power_supply_propval *val) { … } static enum power_supply_property max1721x_battery_props[] = …; static int get_string(struct max17211_device_info *info, uint16_t reg, uint8_t nr, char *str) { … } /* Maxim say: Serial number is a hex string up to 12 hex characters */ static int get_sn_string(struct max17211_device_info *info, char *str) { … } /* * MAX1721x registers description for w1-regmap */ static const struct regmap_range max1721x_allow_range[] = …; static const struct regmap_range max1721x_deny_range[] = …; static const struct regmap_access_table max1721x_regs = …; /* * Model Gauge M5 Algorithm output register * Volatile data (must not be cached) */ static const struct regmap_range max1721x_volatile_allow[] = …; static const struct regmap_access_table max1721x_volatile_regs = …; /* * W1-regmap config */ static const struct regmap_config max1721x_regmap_w1_config = …; static int devm_w1_max1721x_add_device(struct w1_slave *sl) { … } static const struct w1_family_ops w1_max1721x_fops = …; static struct w1_family w1_max1721x_family = …; module_w1_family(…); MODULE_LICENSE(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_ALIAS(…) …;
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