diff options
| -rw-r--r-- | Documentation/ABI/testing/sysfs-class-power-max1720x | 32 | ||||
| -rw-r--r-- | drivers/power/supply/max1720x_battery.c | 60 |
2 files changed, 91 insertions, 1 deletions
diff --git a/Documentation/ABI/testing/sysfs-class-power-max1720x b/Documentation/ABI/testing/sysfs-class-power-max1720x new file mode 100644 index 000000000000..7d895bfda9ce --- /dev/null +++ b/Documentation/ABI/testing/sysfs-class-power-max1720x @@ -0,0 +1,32 @@ +What: /sys/class/power_supply/max1720x/temp_ain1 +Date: January 2025 +KernelVersion: 6.14 +Contact: Dimitri Fedrau <dimitri.fedrau@liebherr.com> +Description: + Reports the current temperature reading from AIN1 thermistor. + + Access: Read + + Valid values: Represented in 1/10 Degrees Celsius + +What: /sys/class/power_supply/max1720x/temp_ain2 +Date: January 2025 +KernelVersion: 6.14 +Contact: Dimitri Fedrau <dimitri.fedrau@liebherr.com> +Description: + Reports the current temperature reading from AIN2 thermistor. + + Access: Read + + Valid values: Represented in 1/10 Degrees Celsius + +What: /sys/class/power_supply/max1720x/temp_int +Date: January 2025 +KernelVersion: 6.14 +Contact: Dimitri Fedrau <dimitri.fedrau@liebherr.com> +Description: + Reports the current temperature reading from internal die. + + Access: Read + + Valid values: Represented in 1/10 Degrees Celsius diff --git a/drivers/power/supply/max1720x_battery.c b/drivers/power/supply/max1720x_battery.c index 9c7e14d2c7b8..11580e414713 100644 --- a/drivers/power/supply/max1720x_battery.c +++ b/drivers/power/supply/max1720x_battery.c @@ -16,6 +16,11 @@ #include <linux/unaligned.h> +/* SBS compliant registers */ +#define MAX172XX_TEMP1 0x34 +#define MAX172XX_INT_TEMP 0x35 +#define MAX172XX_TEMP2 0x3B + /* Nonvolatile registers */ #define MAX1720X_NXTABLE0 0x80 #define MAX1720X_NRSENSE 0xCF /* RSense in 10^-5 Ohm */ @@ -113,11 +118,15 @@ static const struct regmap_config max1720x_regmap_cfg = { }; static const struct regmap_range max1720x_nvmem_allow[] = { + regmap_reg_range(MAX172XX_TEMP1, MAX172XX_INT_TEMP), + regmap_reg_range(MAX172XX_TEMP2, MAX172XX_TEMP2), regmap_reg_range(MAX1720X_NXTABLE0, MAX1720X_NDEVICE_NAME4), }; static const struct regmap_range max1720x_nvmem_deny[] = { - regmap_reg_range(0x00, 0x7F), + regmap_reg_range(0x00, 0x33), + regmap_reg_range(0x36, 0x3A), + regmap_reg_range(0x3C, 0x7F), regmap_reg_range(0xE0, 0xFF), }; @@ -388,6 +397,54 @@ static int max1720x_battery_get_property(struct power_supply *psy, return ret; } +static int max1720x_read_temp(struct device *dev, u8 reg, char *buf) +{ + struct power_supply *psy = dev_get_drvdata(dev); + struct max1720x_device_info *info = power_supply_get_drvdata(psy); + unsigned int val; + int ret; + + ret = regmap_read(info->regmap_nv, reg, &val); + if (ret < 0) + return ret; + + /* + * Temperature in degrees Celsius starting at absolute zero, -273C or + * 0K with an LSb of 0.1C + */ + return sysfs_emit(buf, "%d\n", val - 2730); +} + +static ssize_t temp_ain1_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + return max1720x_read_temp(dev, MAX172XX_TEMP1, buf); +} + +static ssize_t temp_ain2_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + return max1720x_read_temp(dev, MAX172XX_TEMP2, buf); +} + +static ssize_t temp_int_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + return max1720x_read_temp(dev, MAX172XX_INT_TEMP, buf); +} + +static DEVICE_ATTR_RO(temp_ain1); +static DEVICE_ATTR_RO(temp_ain2); +static DEVICE_ATTR_RO(temp_int); + +static struct attribute *max1720x_attrs[] = { + &dev_attr_temp_ain1.attr, + &dev_attr_temp_ain2.attr, + &dev_attr_temp_int.attr, + NULL +}; +ATTRIBUTE_GROUPS(max1720x); + static int max1720x_nvmem_reg_read(void *priv, unsigned int off, void *val, size_t len) { @@ -488,6 +545,7 @@ static int max1720x_probe(struct i2c_client *client) psy_cfg.drv_data = info; psy_cfg.fwnode = dev_fwnode(dev); + psy_cfg.attr_grp = max1720x_groups; i2c_set_clientdata(client, info); info->regmap = devm_regmap_init_i2c(client, &max1720x_regmap_cfg); if (IS_ERR(info->regmap)) |