// 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
};
/* 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, ®val);
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, ®val);
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, ®val);
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, ®val);
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, ®val);
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, ®val);
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_input_voltage(struct ltc4162l_info *info,
union power_supply_propval *val)
{
unsigned int regval;
int ret;
ret = regmap_read(info->regmap, LTC4162L_VIN, ®val);
if (ret)
return ret;
/* 1.649mV/LSB */
val->intval = regval * 1694;
return 0;
}
static int ltc4162l_get_input_current(struct ltc4162l_info *info,
union power_supply_propval *val)
{
unsigned int regval;
int ret;
ret = regmap_read(info->regmap, LTC4162L_IIN, ®val);
if (ret)
return ret;
/* Signed 16-bit number, 1.466μV / RSNSI amperes/LSB. */
ret = (s16)(regval & 0xFFFF);
ret *= 14660;
ret /= info->rsnsi;
ret *= 100;
val->intval = ret;
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, ®val);
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, ®val);
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, ®val);
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, ®val);
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, ®val);
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, ®val);
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, ®val);
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 vbat_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);
union power_supply_propval val;
int ret;
ret = ltc4162l_get_vbat(info, LTC4162L_VBAT, &val);
if (ret)
return ret;
return sprintf(buf, "%d\n", val.intval);
}
static DEVICE_ATTR_RO(vbat);
static ssize_t vbat_avg_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);
union power_supply_propval val;
int ret;
ret = ltc4162l_get_vbat(info, LTC4162L_VBAT_FILT, &val);
if (ret)
return ret;
return sprintf(buf, "%d\n", val.intval);
}
static DEVICE_ATTR_RO(vbat_avg);
static ssize_t ibat_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);
union power_supply_propval val;
int ret;
ret = ltc4162l_get_ibat(info, &val);
if (ret)
return ret;
return sprintf(buf, "%d\n", val.intval);
}
static DEVICE_ATTR_RO(ibat);
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, ®val);
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, ®val);
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_ibat.attr,
&dev_attr_vbat.attr,
&dev_attr_vbat_avg.attr,
&dev_attr_force_telemetry.attr,
&dev_attr_arm_ship_mode.attr,
NULL,
};
static const struct attribute_group ltc4162l_attr_group = {
.name = NULL, /* put in device directory */
.attrs = ltc4162l_sysfs_entries,
};
static const struct attribute_group *ltc4162l_attr_groups[] = {
<c4162l_attr_group,
NULL,
};
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_input_voltage(info, val);
case POWER_SUPPLY_PROP_CURRENT_NOW:
return ltc4162l_get_input_current(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,
POWER_SUPPLY_PROP_CURRENT_NOW,
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, <c4162l_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;
ltc4162l_config.attr_grp = ltc4162l_attr_groups;
info->charger = devm_power_supply_register(dev, <c4162l_desc,
<c4162l_config);
if (IS_ERR(info->charger)) {
dev_err(dev, "Failed to register charger\n");
return PTR_ERR(info->charger);
}
/* 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 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,
.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");