linux/drivers/power/supply/ltc4162-l-charger.c
Rob Herring 2ce8284c31 power: Explicitly include correct DT includes
The DT of_device.h and of_platform.h date back to the separate
of_platform_bus_type before it as merged into the regular platform bus.
As part of that merge prepping Arm DT support 13 years ago, they
"temporarily" include each other. They also include platform_device.h
and of.h. As a result, there's a pretty much random mix of those include
files used throughout the tree. In order to detangle these headers and
replace the implicit includes with struct declarations, users need to
explicitly include the correct includes.

Acked-by: David Lechner <david@lechnology.com>
Signed-off-by: Rob Herring <robh@kernel.org>
Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
2023-07-19 22:47:03 +02:00

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// 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.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, &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_input_voltage(struct ltc4162l_info *info,
union power_supply_propval *val)
{
unsigned int regval;
int ret;
ret = regmap_read(info->regmap, LTC4162L_VIN, &regval);
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, &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;
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, &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 sysfs_emit(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 sysfs_emit(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 sysfs_emit(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 sysfs_emit(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, &regval);
if (ret)
return ret;
return sysfs_emit(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 sysfs_emit(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[] = {
&ltc4162l_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)
{
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;
ltc4162l_config.attr_grp = ltc4162l_attr_groups;
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);
}
/* 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[] __maybe_unused = {
{ .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");