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SubjectRe: [PATCH v3] power/supply: Add ltc4162-l-charger
Hi,

Sorry for slow processing of this. Driver looks mostly fine, but I
do have some comments.

On Mon, Nov 02, 2020 at 10:21:31AM +0100, Mike Looijmans wrote:
> Add support for the LTC4162-L Li-Ion battery charger. The driver allows
> reading back telemetry and to set some charging options like the input
> current limit.
>
> Signed-off-by: Mike Looijmans <mike.looijmans@topic.nl>
> ---
> v2: Use microohm units instead of milliohm
> Add interrupt support using smbalert
> Support obtaining cell-count from devicetree
> v3: Fix overflows in calculations involving resistor values
> resent, mail bounced
>
> drivers/power/supply/Kconfig | 8 +
> drivers/power/supply/Makefile | 1 +
> drivers/power/supply/ltc4162-l-charger.c | 898 +++++++++++++++++++++++
> 3 files changed, 907 insertions(+)
> create mode 100644 drivers/power/supply/ltc4162-l-charger.c
>
> diff --git a/drivers/power/supply/Kconfig b/drivers/power/supply/Kconfig
> index eec646c568b7..23000976cb42 100644
> --- a/drivers/power/supply/Kconfig
> +++ b/drivers/power/supply/Kconfig
> @@ -513,6 +513,14 @@ config CHARGER_LT3651
> Say Y to include support for the Analog Devices (Linear Technology)
> LT3651 battery charger which reports its status via GPIO lines.
>
> +config CHARGER_LTC4162L
> + tristate "LTC4162-L charger"
> + depends on I2C
> + select REGMAP_I2C
> + help
> + Say Y to include support for the Analog Devices (Linear Technology)
> + LTC4162-L battery charger connected to I2C.
> +
> config CHARGER_MAX14577
> tristate "Maxim MAX14577/77836 battery charger driver"
> depends on MFD_MAX14577
> diff --git a/drivers/power/supply/Makefile b/drivers/power/supply/Makefile
> index dd4b86318cd9..17b1cf921c44 100644
> --- a/drivers/power/supply/Makefile
> +++ b/drivers/power/supply/Makefile
> @@ -70,6 +70,7 @@ obj-$(CONFIG_CHARGER_LP8788) += lp8788-charger.o
> obj-$(CONFIG_CHARGER_GPIO) += gpio-charger.o
> obj-$(CONFIG_CHARGER_MANAGER) += charger-manager.o
> obj-$(CONFIG_CHARGER_LT3651) += lt3651-charger.o
> +obj-$(CONFIG_CHARGER_LTC4162L) += ltc4162-l-charger.o
> obj-$(CONFIG_CHARGER_MAX14577) += max14577_charger.o
> obj-$(CONFIG_CHARGER_DETECTOR_MAX14656) += max14656_charger_detector.o
> obj-$(CONFIG_CHARGER_MAX77650) += max77650-charger.o
> diff --git a/drivers/power/supply/ltc4162-l-charger.c b/drivers/power/supply/ltc4162-l-charger.c
> new file mode 100644
> index 000000000000..b2f666113125
> --- /dev/null
> +++ b/drivers/power/supply/ltc4162-l-charger.c
> @@ -0,0 +1,898 @@
> +// SPDX-License-Identifier: GPL-2.0-or-later
> +/*
> + * Driver for Analog Devices (Linear Technology) LTC4162-L charger IC.
> + * Copyright (C) 2020, Topic Embedded Products
> + */
> +
> +#include <linux/module.h>
> +#include <linux/delay.h>
> +#include <linux/of_device.h>
> +#include <linux/pm_runtime.h>
> +#include <linux/power_supply.h>
> +#include <linux/i2c.h>
> +#include <linux/regmap.h>
> +
> +/* Registers (names based on what datasheet uses) */
> +#define LTC4162L_EN_LIMIT_ALERTS_REG 0x0D
> +#define LTC4162L_EN_CHARGER_STATE_ALERTS_REG 0x0E
> +#define LTC4162L_EN_CHARGE_STATUS_ALERTS_REG 0x0F
> +#define LTC4162L_CONFIG_BITS_REG 0x14
> +#define LTC4162L_IIN_LIMIT_TARGET 0x15
> +#define LTC4162L_ARM_SHIP_MODE 0x19
> +#define LTC4162L_CHARGE_CURRENT_SETTING 0X1A
> +#define LTC4162L_VCHARGE_SETTING 0X1B
> +#define LTC4162L_C_OVER_X_THRESHOLD 0x1C
> +#define LTC4162L_MAX_CV_TIME 0X1D
> +#define LTC4162L_MAX_CHARGE_TIME 0X1E
> +#define LTC4162L_CHARGER_CONFIG_BITS 0x29
> +#define LTC4162L_CHARGER_STATE 0x34
> +#define LTC4162L_CHARGE_STATUS 0x35
> +#define LTC4162L_LIMIT_ALERTS_REG 0x36
> +#define LTC4162L_CHARGER_STATE_ALERTS_REG 0x37
> +#define LTC4162L_CHARGE_STATUS_ALERTS_REG 0x38
> +#define LTC4162L_SYSTEM_STATUS_REG 0x39
> +#define LTC4162L_VBAT 0x3A
> +#define LTC4162L_VIN 0x3B
> +#define LTC4162L_VOUT 0x3C
> +#define LTC4162L_IBAT 0x3D
> +#define LTC4162L_IIN 0x3E
> +#define LTC4162L_DIE_TEMPERATURE 0x3F
> +#define LTC4162L_THERMISTOR_VOLTAGE 0x40
> +#define LTC4162L_BSR 0x41
> +#define LTC4162L_JEITA_REGION 0x42
> +#define LTC4162L_CHEM_CELLS_REG 0x43
> +#define LTC4162L_ICHARGE_DAC 0x44
> +#define LTC4162L_VCHARGE_DAC 0x45
> +#define LTC4162L_IIN_LIMIT_DAC 0x46
> +#define LTC4162L_VBAT_FILT 0x47
> +#define LTC4162L_INPUT_UNDERVOLTAGE_DAC 0x4B
> +
> +/* Enumeration as in datasheet. Individual bits are mutually exclusive. */
> +enum ltc4162l_state {
> + battery_detection = 2048,
> + charger_suspended = 256,
> + precharge = 128, /* trickle on low bat voltage */
> + cc_cv_charge = 64, /* normal charge */
> + ntc_pause = 32,
> + timer_term = 16,
> + c_over_x_term = 8, /* battery is full */
> + max_charge_time_fault = 4,
> + bat_missing_fault = 2,
> + bat_short_fault = 1
> +};
> +
> +/* Individual bits are mutually exclusive. Only active in charging states.*/
> +enum ltc4162l_charge_status {
> + ilim_reg_active = 32,
> + thermal_reg_active = 16,
> + vin_uvcl_active = 8,
> + iin_limit_active = 4,
> + constant_current = 2,
> + constant_voltage = 1,
> + charger_off = 0
> +};

+use BIT(0), BIT(1), ...

> +/* Magic number to write to ARM_SHIP_MODE register */
> +#define LTC4162L_ARM_SHIP_MODE_MAGIC 21325
> +
> +struct ltc4162l_info {
> + struct i2c_client *client;
> + struct regmap *regmap;
> + struct power_supply *charger;
> + u32 rsnsb; /* Series resistor that sets charge current, microOhm */
> + u32 rsnsi; /* Series resistor to measure input current, microOhm */
> + u8 cell_count; /* Number of connected cells, 0 while unknown */
> +};
> +
> +static u8 ltc4162l_get_cell_count(struct ltc4162l_info *info)
> +{
> + int ret;
> + unsigned int val;
> +
> + /* Once read successfully */
> + if (info->cell_count)
> + return info->cell_count;
> +
> + ret = regmap_read(info->regmap, LTC4162L_CHEM_CELLS_REG, &val);
> + if (ret)
> + return 0;
> +
> + /* Lower 4 bits is the cell count, or 0 if the chip doesn't know yet */
> + val &= 0x0f;
> + if (!val)
> + return 0;
> +
> + /* Once determined, keep the value */
> + info->cell_count = val;
> +
> + return val;
> +};
> +
> +/* Convert enum value to POWER_SUPPLY_STATUS value */
> +static int ltc4162l_state_decode(enum ltc4162l_state value)
> +{
> + switch (value) {
> + case precharge:
> + case cc_cv_charge:
> + return POWER_SUPPLY_STATUS_CHARGING;
> + case c_over_x_term:
> + return POWER_SUPPLY_STATUS_FULL;
> + case bat_missing_fault:
> + case bat_short_fault:
> + return POWER_SUPPLY_STATUS_UNKNOWN;
> + default:
> + return POWER_SUPPLY_STATUS_NOT_CHARGING;
> + }
> +};
> +
> +static int ltc4162l_get_status(struct ltc4162l_info *info,
> + union power_supply_propval *val)
> +{
> + unsigned int regval;
> + int ret;
> +
> + ret = regmap_read(info->regmap, LTC4162L_CHARGER_STATE, &regval);
> + if (ret) {
> + dev_err(&info->client->dev, "Failed to read CHARGER_STATE\n");
> + return ret;
> + }
> +
> + val->intval = ltc4162l_state_decode(regval);
> +
> + return 0;
> +}
> +
> +static int ltc4162l_charge_status_decode(enum ltc4162l_charge_status value)
> +{
> + if (!value)
> + return POWER_SUPPLY_CHARGE_TYPE_NONE;
> +
> + /* constant voltage/current and input_current limit are "fast" modes */
> + if (value <= iin_limit_active)
> + return POWER_SUPPLY_CHARGE_TYPE_FAST;
> +
> + /* Anything that's not fast we'll return as trickle */
> + return POWER_SUPPLY_CHARGE_TYPE_TRICKLE;
> +}
> +
> +static int ltc4162l_get_charge_type(struct ltc4162l_info *info,
> + union power_supply_propval *val)
> +{
> + unsigned int regval;
> + int ret;
> +
> + ret = regmap_read(info->regmap, LTC4162L_CHARGE_STATUS, &regval);
> + if (ret)
> + return ret;
> +
> + val->intval = ltc4162l_charge_status_decode(regval);
> +
> + return 0;
> +}
> +
> +static int ltc4162l_state_to_health(enum ltc4162l_state value)
> +{
> + switch (value) {
> + case ntc_pause:
> + return POWER_SUPPLY_HEALTH_OVERHEAT;
> + case timer_term:
> + return POWER_SUPPLY_HEALTH_SAFETY_TIMER_EXPIRE;
> + case max_charge_time_fault:
> + return POWER_SUPPLY_HEALTH_WATCHDOG_TIMER_EXPIRE;
> + case bat_missing_fault:
> + return POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
> + case bat_short_fault:
> + return POWER_SUPPLY_HEALTH_DEAD;
> + default:
> + return POWER_SUPPLY_HEALTH_GOOD;
> + }
> +}
> +
> +static int ltc4162l_get_health(struct ltc4162l_info *info,
> + union power_supply_propval *val)
> +{
> + unsigned int regval;
> + int ret;
> +
> + ret = regmap_read(info->regmap, LTC4162L_CHARGER_STATE, &regval);
> + if (ret)
> + return ret;
> +
> + val->intval = ltc4162l_state_to_health(regval);
> +
> + return 0;
> +}
> +
> +static int ltc4162l_get_online(struct ltc4162l_info *info,
> + union power_supply_propval *val)
> +{
> + unsigned int regval;
> + int ret;
> +
> + ret = regmap_read(info->regmap, LTC4162L_SYSTEM_STATUS_REG, &regval);
> + if (ret)
> + return ret;
> +
> + /* BIT(2) indicates if input voltage is sufficient to charge */
> + val->intval = !!(regval & BIT(2));
> +
> + return 0;
> +}
> +
> +
> +static int ltc4162l_get_vbat(struct ltc4162l_info *info,
> + unsigned int reg,
> + union power_supply_propval *val)
> +{
> + unsigned int regval;
> + int ret;
> +
> + ret = regmap_read(info->regmap, reg, &regval);
> + if (ret)
> + return ret;
> +
> + /* cell_count × 192.4μV/LSB */
> + regval *= 1924;
> + regval *= ltc4162l_get_cell_count(info);
> + regval /= 10;
> + val->intval = regval;
> +
> + return 0;
> +}
> +
> +static int ltc4162l_get_ibat(struct ltc4162l_info *info,
> + union power_supply_propval *val)
> +{
> + unsigned int regval;
> + int ret;
> +
> + ret = regmap_read(info->regmap, LTC4162L_IBAT, &regval);
> + if (ret)
> + return ret;
> +
> + /* Signed 16-bit number, 1.466μV / RSNSB amperes/LSB. */
> + ret = (s16)(regval & 0xFFFF);
> + val->intval = 100 * mult_frac(ret, 14660, (int)info->rsnsb);
> +
> + return 0;
> +}
> +
> +static int ltc4162l_get_icharge(struct ltc4162l_info *info,
> + unsigned int reg,
> + union power_supply_propval *val)
> +{
> + unsigned int regval;
> + int ret;
> +
> + ret = regmap_read(info->regmap, reg, &regval);
> + if (ret)
> + return ret;
> +
> + regval &= BIT(6) - 1; /* Only the lower 5 bits */
> +
> + /* The charge current servo level: (icharge_dac + 1) × 1mV/RSNSB */
> + ++regval;
> + val->intval = 10000u * mult_frac(regval, 100000u, info->rsnsb);
> +
> + return 0;
> +}
> +
> +static int ltc4162l_set_icharge(struct ltc4162l_info *info,
> + unsigned int reg,
> + unsigned int value)
> +{
> + value = mult_frac(value, info->rsnsb, 100000u);
> + value /= 10000u;
> +
> + /* Round to lowest possible */
> + if (value)
> + --value;
> +
> + if (value > 31)
> + return -EINVAL;
> +
> + return regmap_write(info->regmap, reg, value);
> +}
> +
> +
> +static int ltc4162l_get_vcharge(struct ltc4162l_info *info,
> + unsigned int reg,
> + union power_supply_propval *val)
> +{
> + unsigned int regval;
> + int ret;
> + u32 voltage;
> +
> + ret = regmap_read(info->regmap, reg, &regval);
> + if (ret)
> + return ret;
> +
> + regval &= BIT(6) - 1; /* Only the lower 5 bits */
> +
> + /*
> + * charge voltage setting can be computed from
> + * cell_count × (vcharge_setting × 12.5mV + 3.8125V)
> + * where vcharge_setting ranges from 0 to 31 (4.2V max).
> + */
> + voltage = 3812500 + (regval * 12500);
> + voltage *= ltc4162l_get_cell_count(info);
> + val->intval = voltage;
> +
> + return 0;
> +}
> +
> +static int ltc4162l_set_vcharge(struct ltc4162l_info *info,
> + unsigned int reg,
> + unsigned int value)
> +{
> + u8 cell_count = ltc4162l_get_cell_count(info);
> +
> + if (!cell_count)
> + return -EBUSY; /* Not available yet, try again later */
> +
> + value /= cell_count;
> +
> + if (value < 3812500)
> + return -EINVAL;
> +
> + value -= 3812500;
> + value /= 12500;
> +
> + if (value > 31)
> + return -EINVAL;
> +
> + return regmap_write(info->regmap, reg, value);
> +}
> +
> +static int ltc4162l_get_iin_limit_dac(struct ltc4162l_info *info,
> + union power_supply_propval *val)
> +{
> + unsigned int regval;
> + int ret;
> +
> + ret = regmap_read(info->regmap, LTC4162L_IIN_LIMIT_DAC, &regval);
> + if (ret)
> + return ret;
> +
> + regval &= BIT(6) - 1; /* Only 6 bits */
> +
> + /* (iin_limit_dac + 1) × 500μV / RSNSI */
> + ++regval;
> + regval *= 5000000u;
> + regval /= info->rsnsi;
> + val->intval = 100u * regval;
> +
> + return 0;
> +}
> +
> +static int ltc4162l_set_iin_limit(struct ltc4162l_info *info,
> + unsigned int value)
> +{
> + unsigned int regval;
> +
> + regval = mult_frac(value, info->rsnsi, 50000u);
> + regval /= 10000u;
> + if (regval)
> + --regval;
> + if (regval > 63)
> + regval = 63;
> +
> + return regmap_write(info->regmap, LTC4162L_IIN_LIMIT_TARGET, regval);
> +}
> +
> +static int ltc4162l_get_die_temp(struct ltc4162l_info *info,
> + union power_supply_propval *val)
> +{
> + unsigned int regval;
> + int ret;
> +
> + ret = regmap_read(info->regmap, LTC4162L_DIE_TEMPERATURE, &regval);
> + if (ret)
> + return ret;
> +
> + /* die_temp × 0.0215°C/LSB - 264.4°C */
> + ret = (s16)(regval & 0xFFFF);
> + ret *= 215;
> + ret /= 100; /* Centidegrees scale */
> + ret -= 26440;
> + val->intval = ret;
> +
> + return 0;
> +}
> +
> +static int ltc4162l_get_term_current(struct ltc4162l_info *info,
> + union power_supply_propval *val)
> +{
> + unsigned int regval;
> + int ret;
> +
> + ret = regmap_read(info->regmap, LTC4162L_CHARGER_CONFIG_BITS, &regval);
> + if (ret)
> + return ret;
> +
> + /* Check if C_OVER_X_THRESHOLD is enabled */
> + if (!(regval & BIT(2))) {
> + val->intval = 0;
> + return 0;
> + }
> +
> + ret = regmap_read(info->regmap, LTC4162L_C_OVER_X_THRESHOLD, &regval);
> + if (ret)
> + return ret;
> +
> + /* 1.466μV / RSNSB amperes/LSB */
> + regval *= 14660u;
> + regval /= info->rsnsb;
> + val->intval = 100 * regval;
> +
> + return 0;
> +}
> +
> +static int ltc4162l_set_term_current(struct ltc4162l_info *info,
> + unsigned int value)
> +{
> + int ret;
> + unsigned int regval;
> +
> + if (!value) {
> + /* Disable en_c_over_x_term when set to zero */
> + return regmap_update_bits(info->regmap,
> + LTC4162L_CHARGER_CONFIG_BITS,
> + BIT(2), 0);
> + }
> +
> + regval = mult_frac(value, info->rsnsb, 14660u);
> + regval /= 100u;
> +
> + ret = regmap_write(info->regmap, LTC4162L_C_OVER_X_THRESHOLD, regval);
> + if (ret)
> + return ret;
> +
> + /* Set en_c_over_x_term after changing the threshold value */
> + return regmap_update_bits(info->regmap, LTC4162L_CHARGER_CONFIG_BITS,
> + BIT(2), BIT(2));
> +}
> +
> +/* Custom properties */
> +static const char * const ltc4162l_charge_status_name[] = {
> + "ilim_reg_active", /* 32 */
> + "thermal_reg_active",
> + "vin_uvcl_active",
> + "iin_limit_active",
> + "constant_current",
> + "constant_voltage",
> + "charger_off" /* 0 */
> +};
> +
> +static ssize_t charge_status_show(struct device *dev,
> + struct device_attribute *attr, char *buf)
> +{
> + struct power_supply *psy = to_power_supply(dev);
> + struct ltc4162l_info *info = power_supply_get_drvdata(psy);
> + const char *result = ltc4162l_charge_status_name[
> + ARRAY_SIZE(ltc4162l_charge_status_name) - 1];
> + unsigned int regval;
> + unsigned int mask;
> + unsigned int index;
> + int ret;
> +
> + ret = regmap_read(info->regmap, LTC4162L_CHARGE_STATUS, &regval);
> + if (ret)
> + return ret;
> +
> + /* Only one bit is set according to datasheet, let's be safe here */
> + for (mask = 32, index = 0; mask != 0; mask >>= 1, ++index) {
> + if (regval & mask) {
> + result = ltc4162l_charge_status_name[index];
> + break;
> + }
> + }
> +
> + return sprintf(buf, "%s\n", result);
> +}
> +static DEVICE_ATTR_RO(charge_status);
> +
> +static ssize_t input_voltage_show(struct device *dev,
> + struct device_attribute *attr, char *buf)
> +{
> + struct power_supply *psy = to_power_supply(dev);
> + struct ltc4162l_info *info = power_supply_get_drvdata(psy);
> + unsigned int regval;
> + int ret;
> +
> + ret = regmap_read(info->regmap, LTC4162L_VIN, &regval);
> + if (ret)
> + return ret;
> +
> + /* 1.649mV/LSB */
> + regval *= 1694;
> +
> + return sprintf(buf, "%u\n", regval);
> +}
> +static DEVICE_ATTR_RO(input_voltage);
> +
> +static ssize_t input_current_show(struct device *dev,
> + struct device_attribute *attr, char *buf)
> +{
> + struct power_supply *psy = to_power_supply(dev);
> + struct ltc4162l_info *info = power_supply_get_drvdata(psy);
> + unsigned int regval;
> + int ret;
> +
> + ret = regmap_read(info->regmap, LTC4162L_IIN, &regval);
> + if (ret)
> + return ret;
> +
> + /* Signed 16-bit number, 1.466μV / RSNSI amperes/LSB. */
> + ret = (s16)(regval & 0xFFFF);
> + ret *= 14660;
> + ret /= info->rsnsi;
> + ret *= 100;
> +
> + return sprintf(buf, "%d\n", ret);
> +}
> +static DEVICE_ATTR_RO(input_current);
> +
> +static ssize_t force_telemetry_show(struct device *dev,
> + struct device_attribute *attr, char *buf)
> +{
> + struct power_supply *psy = to_power_supply(dev);
> + struct ltc4162l_info *info = power_supply_get_drvdata(psy);
> + unsigned int regval;
> + int ret;
> +
> + ret = regmap_read(info->regmap, LTC4162L_CONFIG_BITS_REG, &regval);
> + if (ret)
> + return ret;
> +
> + return sprintf(buf, "%u\n", regval & BIT(2) ? 1 : 0);
> +}
> +
> +static ssize_t force_telemetry_store(struct device *dev,
> + struct device_attribute *attr,
> + const char *buf,
> + size_t count)
> +{
> + struct power_supply *psy = to_power_supply(dev);
> + struct ltc4162l_info *info = power_supply_get_drvdata(psy);
> + int ret;
> + unsigned int value;
> +
> + ret = kstrtouint(buf, 0, &value);
> + if (ret < 0)
> + return ret;
> +
> + ret = regmap_update_bits(info->regmap, LTC4162L_CONFIG_BITS_REG,
> + BIT(2), value ? BIT(2) : 0);
> + if (ret < 0)
> + return ret;
> +
> + return count;
> +}
> +
> +static DEVICE_ATTR_RW(force_telemetry);
> +
> +static ssize_t arm_ship_mode_show(struct device *dev,
> + struct device_attribute *attr, char *buf)
> +{
> + struct power_supply *psy = to_power_supply(dev);
> + struct ltc4162l_info *info = power_supply_get_drvdata(psy);
> + unsigned int regval;
> + int ret;
> +
> + ret = regmap_read(info->regmap, LTC4162L_ARM_SHIP_MODE, &regval);
> + if (ret)
> + return ret;
> +
> + return sprintf(buf, "%u\n",
> + regval == LTC4162L_ARM_SHIP_MODE_MAGIC ? 1 : 0);
> +}
> +
> +static ssize_t arm_ship_mode_store(struct device *dev,
> + struct device_attribute *attr,
> + const char *buf,
> + size_t count)
> +{
> + struct power_supply *psy = to_power_supply(dev);
> + struct ltc4162l_info *info = power_supply_get_drvdata(psy);
> + int ret;
> + unsigned int value;
> +
> + ret = kstrtouint(buf, 0, &value);
> + if (ret < 0)
> + return ret;
> +
> + ret = regmap_write(info->regmap, LTC4162L_ARM_SHIP_MODE,
> + value ? LTC4162L_ARM_SHIP_MODE_MAGIC : 0);
> + if (ret < 0)
> + return ret;
> +
> + return count;
> +}
> +
> +static DEVICE_ATTR_RW(arm_ship_mode);
> +
> +static struct attribute *ltc4162l_sysfs_entries[] = {
> + &dev_attr_charge_status.attr,
> + &dev_attr_input_voltage.attr,
> + &dev_attr_input_current.attr,
> + &dev_attr_force_telemetry.attr,
> + &dev_attr_arm_ship_mode.attr,
> + NULL,
> +};
> +
> +static struct attribute_group ltc4162l_attr_group = {
> + .name = NULL, /* put in device directory */
> + .attrs = ltc4162l_sysfs_entries,
> +};
> +
> +static int ltc4162l_get_property(struct power_supply *psy,
> + enum power_supply_property psp,
> + union power_supply_propval *val)
> +{
> + struct ltc4162l_info *info = power_supply_get_drvdata(psy);
> +
> + switch (psp) {
> + case POWER_SUPPLY_PROP_STATUS:
> + return ltc4162l_get_status(info, val);
> + case POWER_SUPPLY_PROP_CHARGE_TYPE:
> + return ltc4162l_get_charge_type(info, val);
> + case POWER_SUPPLY_PROP_HEALTH:
> + return ltc4162l_get_health(info, val);
> + case POWER_SUPPLY_PROP_ONLINE:
> + return ltc4162l_get_online(info, val);
> + case POWER_SUPPLY_PROP_VOLTAGE_NOW:
> + return ltc4162l_get_vbat(info, LTC4162L_VBAT, val);
> + case POWER_SUPPLY_PROP_VOLTAGE_AVG:
> + return ltc4162l_get_vbat(info, LTC4162L_VBAT_FILT, val);
> + case POWER_SUPPLY_PROP_CURRENT_NOW:
> + return ltc4162l_get_ibat(info, val);
> + case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
> + return ltc4162l_get_icharge(info,
> + LTC4162L_ICHARGE_DAC, val);
> + case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX:
> + return ltc4162l_get_icharge(info,
> + LTC4162L_CHARGE_CURRENT_SETTING, val);
> + case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
> + return ltc4162l_get_vcharge(info,
> + LTC4162L_VCHARGE_DAC, val);
> + case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX:
> + return ltc4162l_get_vcharge(info,
> + LTC4162L_VCHARGE_SETTING, val);
> + case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
> + return ltc4162l_get_iin_limit_dac(info, val);
> + case POWER_SUPPLY_PROP_TEMP:
> + return ltc4162l_get_die_temp(info, val);
> + case POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT:
> + return ltc4162l_get_term_current(info, val);
> + default:
> + return -EINVAL;
> + }
> +}
> +
> +static int ltc4162l_set_property(struct power_supply *psy,
> + enum power_supply_property psp,
> + const union power_supply_propval *val)
> +{
> + struct ltc4162l_info *info = power_supply_get_drvdata(psy);
> +
> + switch (psp) {
> + case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX:
> + return ltc4162l_set_icharge(info,
> + LTC4162L_CHARGE_CURRENT_SETTING, val->intval);
> + case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX:
> + return ltc4162l_set_vcharge(info,
> + LTC4162L_VCHARGE_SETTING, val->intval);
> + case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
> + return ltc4162l_set_iin_limit(info, val->intval);
> + case POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT:
> + return ltc4162l_set_term_current(info, val->intval);
> + default:
> + return -EINVAL;
> + }
> +}
> +
> +static int ltc4162l_property_is_writeable(struct power_supply *psy,
> + enum power_supply_property psp)
> +{
> + switch (psp) {
> + case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX:
> + case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX:
> + case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
> + case POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT:
> + return 1;
> + default:
> + return 0;
> + }
> +}
> +
> +/* Charger power supply property routines */
> +static enum power_supply_property ltc4162l_properties[] = {
> + POWER_SUPPLY_PROP_STATUS,
> + POWER_SUPPLY_PROP_CHARGE_TYPE,
> + POWER_SUPPLY_PROP_HEALTH,
> + POWER_SUPPLY_PROP_ONLINE,
> + POWER_SUPPLY_PROP_VOLTAGE_NOW, /* Reports battery voltage */
> + POWER_SUPPLY_PROP_VOLTAGE_AVG,
> + POWER_SUPPLY_PROP_CURRENT_NOW, /* Reports battery current */

above 3 properties should describe input voltage/current for chargers,
see Documentation/ABI/testing/sysfs-class-power

Battery IBAT and VBAT can currently only be reported from
POWER_SUPPLY_TYPE_BATTERY.

> + POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT,
> + POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX,
> + POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE,
> + POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX,
> + POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT,
> + POWER_SUPPLY_PROP_TEMP,
> + POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT,
> +};
> +
> +static const struct power_supply_desc ltc4162l_desc = {
> + .name = "ltc4162-l",
> + .type = POWER_SUPPLY_TYPE_MAINS,
> + .properties = ltc4162l_properties,
> + .num_properties = ARRAY_SIZE(ltc4162l_properties),
> + .get_property = ltc4162l_get_property,
> + .set_property = ltc4162l_set_property,
> + .property_is_writeable = ltc4162l_property_is_writeable,
> +};
> +
> +static bool ltc4162l_is_writeable_reg(struct device *dev, unsigned int reg)
> +{
> + /* all registers up to this one are writeable */
> + if (reg <= LTC4162L_CHARGER_CONFIG_BITS)
> + return true;
> +
> + /* The ALERTS registers can be written to clear alerts */
> + if (reg >= LTC4162L_LIMIT_ALERTS_REG &&
> + reg <= LTC4162L_CHARGE_STATUS_ALERTS_REG)
> + return true;
> +
> + return false;
> +}
> +
> +static bool ltc4162l_is_volatile_reg(struct device *dev, unsigned int reg)
> +{
> + /* all registers after this one are read-only status registers */
> + return reg > LTC4162L_CHARGER_CONFIG_BITS;
> +}
> +
> +static const struct regmap_config ltc4162l_regmap_config = {
> + .reg_bits = 8,
> + .val_bits = 16,
> + .val_format_endian = REGMAP_ENDIAN_LITTLE,
> + .writeable_reg = ltc4162l_is_writeable_reg,
> + .volatile_reg = ltc4162l_is_volatile_reg,
> + .max_register = LTC4162L_INPUT_UNDERVOLTAGE_DAC,
> + .cache_type = REGCACHE_RBTREE,
> +};
> +
> +static void ltc4162l_clear_interrupts(struct ltc4162l_info *info)
> +{
> + /* Acknowledge interrupt to chip by clearing all events */
> + regmap_write(info->regmap, LTC4162L_LIMIT_ALERTS_REG, 0);
> + regmap_write(info->regmap, LTC4162L_CHARGER_STATE_ALERTS_REG, 0);
> + regmap_write(info->regmap, LTC4162L_CHARGE_STATUS_ALERTS_REG, 0);
> +}
> +
> +static int ltc4162l_probe(struct i2c_client *client,
> + const struct i2c_device_id *id)
> +{
> + struct i2c_adapter *adapter = client->adapter;
> + struct device *dev = &client->dev;
> + struct ltc4162l_info *info;
> + struct power_supply_config ltc4162l_config = {};
> + u32 value;
> + int ret;
> +
> + if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA)) {
> + dev_err(dev, "No support for SMBUS_WORD_DATA\n");
> + return -ENODEV;
> + }
> + info = devm_kzalloc(dev, sizeof(*info), GFP_KERNEL);
> + if (!info)
> + return -ENOMEM;
> +
> + info->client = client;
> + i2c_set_clientdata(client, info);
> +
> + info->regmap = devm_regmap_init_i2c(client, &ltc4162l_regmap_config);
> + if (IS_ERR(info->regmap)) {
> + dev_err(dev, "Failed to initialize register map\n");
> + return PTR_ERR(info->regmap);
> + }
> +
> + ret = device_property_read_u32(dev, "lltc,rsnsb-micro-ohms",
> + &info->rsnsb);
> + if (ret) {
> + dev_err(dev, "Missing lltc,rsnsb-micro-ohms property\n");
> + return ret;
> + }
> + if (!info->rsnsb)
> + return -EINVAL;
> +
> + ret = device_property_read_u32(dev, "lltc,rsnsi-micro-ohms",
> + &info->rsnsi);
> + if (ret) {
> + dev_err(dev, "Missing lltc,rsnsi-micro-ohms property\n");
> + return ret;
> + }
> + if (!info->rsnsi)
> + return -EINVAL;
> +
> + if (!device_property_read_u32(dev, "lltc,cell-count", &value))
> + info->cell_count = value;
> +
> + ltc4162l_config.of_node = dev->of_node;
> + ltc4162l_config.drv_data = info;
> +
> + info->charger = devm_power_supply_register(dev, &ltc4162l_desc,
> + &ltc4162l_config);
> + if (IS_ERR(info->charger)) {
> + dev_err(dev, "Failed to register charger\n");
> + return PTR_ERR(info->charger);
> + }
> +
> + ret = sysfs_create_group(&info->charger->dev.kobj,
> + &ltc4162l_attr_group);
> + if (ret)
> + dev_err(dev, "failed to create extra sysfs entries\n");

please use '.attr_grp' in ltc4162l_config, which means the
attributes are registered together with the power-supply
device avoiding a udev race condition. The change also
simplifies the driver code, since (de)registration happens
automatically :)

> + /* Disable the threshold alerts, we're not using them */
> + regmap_write(info->regmap, LTC4162L_EN_LIMIT_ALERTS_REG, 0);
> +
> + /* Enable interrupts on all status changes */
> + regmap_write(info->regmap, LTC4162L_EN_CHARGER_STATE_ALERTS_REG,
> + 0x1fff);
> + regmap_write(info->regmap, LTC4162L_EN_CHARGE_STATUS_ALERTS_REG, 0x1f);
> +
> + ltc4162l_clear_interrupts(info);
> +
> + return 0;
> +}
> +
> +static int ltc4162l_remove(struct i2c_client *client)
> +{
> + struct ltc4162l_info *info = i2c_get_clientdata(client);
> +
> + sysfs_remove_group(&info->charger->dev.kobj, &ltc4162l_attr_group);
> +
> + return 0;
> +}
> +
> +static void ltc4162l_alert(struct i2c_client *client,
> + enum i2c_alert_protocol type, unsigned int flag)
> +{
> + struct ltc4162l_info *info = i2c_get_clientdata(client);
> +
> + if (type != I2C_PROTOCOL_SMBUS_ALERT)
> + return;
> +
> + ltc4162l_clear_interrupts(info);
> + power_supply_changed(info->charger);
> +}
> +
> +static const struct i2c_device_id ltc4162l_i2c_id_table[] = {
> + { "ltc4162-l", 0 },
> + { },
> +};
> +MODULE_DEVICE_TABLE(i2c, ltc4162l_i2c_id_table);
> +
> +static const struct of_device_id ltc4162l_of_match[] = {
> + { .compatible = "lltc,ltc4162-l", },
> + { },
> +};
> +MODULE_DEVICE_TABLE(of, ltc4162l_of_match);
> +
> +static struct i2c_driver ltc4162l_driver = {
> + .probe = ltc4162l_probe,
> + .remove = ltc4162l_remove,
> + .alert = ltc4162l_alert,
> + .id_table = ltc4162l_i2c_id_table,
> + .driver = {
> + .name = "ltc4162-l-charger",
> + .of_match_table = of_match_ptr(ltc4162l_of_match),
> + },
> +};
> +module_i2c_driver(ltc4162l_driver);
> +
> +MODULE_LICENSE("GPL");
> +MODULE_AUTHOR("Mike Looijmans <mike.looijmans@topic.nl>");
> +MODULE_DESCRIPTION("LTC4162-L charger driver");

Otherwise LGTM. Please send bindings and driver as a series next
time :)

Thanks,

-- Sebastian
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