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linux-next/drivers/power/rt9455_charger.c
Javier Martinez Canillas da42bbd99d power: Remove unnecessary MODULE_ALIAS() for I2C drivers 
These drivers already have an I2C device id table that is used to create
module aliases and the used MODULE_ALIAS() was either already in the I2C
table so it was redundant or wasn't a valid I2C id so it was never used.

Signed-off-by: Javier Martinez Canillas <javier@osg.samsung.com>
Signed-off-by: Sebastian Reichel <sre@kernel.org>
2015-09-22 13:35:30 +02:00

1764 lines
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/*
* Driver for Richtek RT9455WSC battery charger.
*
* Copyright (C) 2015 Intel Corporation
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/of_irq.h>
#include <linux/of_device.h>
#include <linux/pm_runtime.h>
#include <linux/power_supply.h>
#include <linux/i2c.h>
#include <linux/acpi.h>
#include <linux/usb/phy.h>
#include <linux/regmap.h>
#define RT9455_MANUFACTURER "Richtek"
#define RT9455_MODEL_NAME "RT9455"
#define RT9455_DRIVER_NAME "rt9455-charger"
#define RT9455_IRQ_NAME "interrupt"
#define RT9455_PWR_RDY_DELAY 1 /* 1 second */
#define RT9455_MAX_CHARGING_TIME 21600 /* 6 hrs */
#define RT9455_BATT_PRESENCE_DELAY 60 /* 60 seconds */
#define RT9455_CHARGE_MODE 0x00
#define RT9455_BOOST_MODE 0x01
#define RT9455_FAULT 0x03
#define RT9455_IAICR_100MA 0x00
#define RT9455_IAICR_500MA 0x01
#define RT9455_IAICR_NO_LIMIT 0x03
#define RT9455_CHARGE_DISABLE 0x00
#define RT9455_CHARGE_ENABLE 0x01
#define RT9455_PWR_FAULT 0x00
#define RT9455_PWR_GOOD 0x01
#define RT9455_REG_CTRL1 0x00 /* CTRL1 reg address */
#define RT9455_REG_CTRL2 0x01 /* CTRL2 reg address */
#define RT9455_REG_CTRL3 0x02 /* CTRL3 reg address */
#define RT9455_REG_DEV_ID 0x03 /* DEV_ID reg address */
#define RT9455_REG_CTRL4 0x04 /* CTRL4 reg address */
#define RT9455_REG_CTRL5 0x05 /* CTRL5 reg address */
#define RT9455_REG_CTRL6 0x06 /* CTRL6 reg address */
#define RT9455_REG_CTRL7 0x07 /* CTRL7 reg address */
#define RT9455_REG_IRQ1 0x08 /* IRQ1 reg address */
#define RT9455_REG_IRQ2 0x09 /* IRQ2 reg address */
#define RT9455_REG_IRQ3 0x0A /* IRQ3 reg address */
#define RT9455_REG_MASK1 0x0B /* MASK1 reg address */
#define RT9455_REG_MASK2 0x0C /* MASK2 reg address */
#define RT9455_REG_MASK3 0x0D /* MASK3 reg address */
enum rt9455_fields {
F_STAT, F_BOOST, F_PWR_RDY, F_OTG_PIN_POLARITY, /* CTRL1 reg fields */
F_IAICR, F_TE_SHDN_EN, F_HIGHER_OCP, F_TE, F_IAICR_INT, F_HIZ,
F_OPA_MODE, /* CTRL2 reg fields */
F_VOREG, F_OTG_PL, F_OTG_EN, /* CTRL3 reg fields */
F_VENDOR_ID, F_CHIP_REV, /* DEV_ID reg fields */
F_RST, /* CTRL4 reg fields */
F_TMR_EN, F_MIVR, F_IPREC, F_IEOC_PERCENTAGE, /* CTRL5 reg fields*/
F_IAICR_SEL, F_ICHRG, F_VPREC, /* CTRL6 reg fields */
F_BATD_EN, F_CHG_EN, F_VMREG, /* CTRL7 reg fields */
F_TSDI, F_VINOVPI, F_BATAB, /* IRQ1 reg fields */
F_CHRVPI, F_CHBATOVI, F_CHTERMI, F_CHRCHGI, F_CH32MI, F_CHTREGI,
F_CHMIVRI, /* IRQ2 reg fields */
F_BSTBUSOVI, F_BSTOLI, F_BSTLOWVI, F_BST32SI, /* IRQ3 reg fields */
F_TSDM, F_VINOVPIM, F_BATABM, /* MASK1 reg fields */
F_CHRVPIM, F_CHBATOVIM, F_CHTERMIM, F_CHRCHGIM, F_CH32MIM, F_CHTREGIM,
F_CHMIVRIM, /* MASK2 reg fields */
F_BSTVINOVIM, F_BSTOLIM, F_BSTLOWVIM, F_BST32SIM, /* MASK3 reg fields */
F_MAX_FIELDS
};
static const struct reg_field rt9455_reg_fields[] = {
[F_STAT] = REG_FIELD(RT9455_REG_CTRL1, 4, 5),
[F_BOOST] = REG_FIELD(RT9455_REG_CTRL1, 3, 3),
[F_PWR_RDY] = REG_FIELD(RT9455_REG_CTRL1, 2, 2),
[F_OTG_PIN_POLARITY] = REG_FIELD(RT9455_REG_CTRL1, 1, 1),
[F_IAICR] = REG_FIELD(RT9455_REG_CTRL2, 6, 7),
[F_TE_SHDN_EN] = REG_FIELD(RT9455_REG_CTRL2, 5, 5),
[F_HIGHER_OCP] = REG_FIELD(RT9455_REG_CTRL2, 4, 4),
[F_TE] = REG_FIELD(RT9455_REG_CTRL2, 3, 3),
[F_IAICR_INT] = REG_FIELD(RT9455_REG_CTRL2, 2, 2),
[F_HIZ] = REG_FIELD(RT9455_REG_CTRL2, 1, 1),
[F_OPA_MODE] = REG_FIELD(RT9455_REG_CTRL2, 0, 0),
[F_VOREG] = REG_FIELD(RT9455_REG_CTRL3, 2, 7),
[F_OTG_PL] = REG_FIELD(RT9455_REG_CTRL3, 1, 1),
[F_OTG_EN] = REG_FIELD(RT9455_REG_CTRL3, 0, 0),
[F_VENDOR_ID] = REG_FIELD(RT9455_REG_DEV_ID, 4, 7),
[F_CHIP_REV] = REG_FIELD(RT9455_REG_DEV_ID, 0, 3),
[F_RST] = REG_FIELD(RT9455_REG_CTRL4, 7, 7),
[F_TMR_EN] = REG_FIELD(RT9455_REG_CTRL5, 7, 7),
[F_MIVR] = REG_FIELD(RT9455_REG_CTRL5, 4, 5),
[F_IPREC] = REG_FIELD(RT9455_REG_CTRL5, 2, 3),
[F_IEOC_PERCENTAGE] = REG_FIELD(RT9455_REG_CTRL5, 0, 1),
[F_IAICR_SEL] = REG_FIELD(RT9455_REG_CTRL6, 7, 7),
[F_ICHRG] = REG_FIELD(RT9455_REG_CTRL6, 4, 6),
[F_VPREC] = REG_FIELD(RT9455_REG_CTRL6, 0, 2),
[F_BATD_EN] = REG_FIELD(RT9455_REG_CTRL7, 6, 6),
[F_CHG_EN] = REG_FIELD(RT9455_REG_CTRL7, 4, 4),
[F_VMREG] = REG_FIELD(RT9455_REG_CTRL7, 0, 3),
[F_TSDI] = REG_FIELD(RT9455_REG_IRQ1, 7, 7),
[F_VINOVPI] = REG_FIELD(RT9455_REG_IRQ1, 6, 6),
[F_BATAB] = REG_FIELD(RT9455_REG_IRQ1, 0, 0),
[F_CHRVPI] = REG_FIELD(RT9455_REG_IRQ2, 7, 7),
[F_CHBATOVI] = REG_FIELD(RT9455_REG_IRQ2, 5, 5),
[F_CHTERMI] = REG_FIELD(RT9455_REG_IRQ2, 4, 4),
[F_CHRCHGI] = REG_FIELD(RT9455_REG_IRQ2, 3, 3),
[F_CH32MI] = REG_FIELD(RT9455_REG_IRQ2, 2, 2),
[F_CHTREGI] = REG_FIELD(RT9455_REG_IRQ2, 1, 1),
[F_CHMIVRI] = REG_FIELD(RT9455_REG_IRQ2, 0, 0),
[F_BSTBUSOVI] = REG_FIELD(RT9455_REG_IRQ3, 7, 7),
[F_BSTOLI] = REG_FIELD(RT9455_REG_IRQ3, 6, 6),
[F_BSTLOWVI] = REG_FIELD(RT9455_REG_IRQ3, 5, 5),
[F_BST32SI] = REG_FIELD(RT9455_REG_IRQ3, 3, 3),
[F_TSDM] = REG_FIELD(RT9455_REG_MASK1, 7, 7),
[F_VINOVPIM] = REG_FIELD(RT9455_REG_MASK1, 6, 6),
[F_BATABM] = REG_FIELD(RT9455_REG_MASK1, 0, 0),
[F_CHRVPIM] = REG_FIELD(RT9455_REG_MASK2, 7, 7),
[F_CHBATOVIM] = REG_FIELD(RT9455_REG_MASK2, 5, 5),
[F_CHTERMIM] = REG_FIELD(RT9455_REG_MASK2, 4, 4),
[F_CHRCHGIM] = REG_FIELD(RT9455_REG_MASK2, 3, 3),
[F_CH32MIM] = REG_FIELD(RT9455_REG_MASK2, 2, 2),
[F_CHTREGIM] = REG_FIELD(RT9455_REG_MASK2, 1, 1),
[F_CHMIVRIM] = REG_FIELD(RT9455_REG_MASK2, 0, 0),
[F_BSTVINOVIM] = REG_FIELD(RT9455_REG_MASK3, 7, 7),
[F_BSTOLIM] = REG_FIELD(RT9455_REG_MASK3, 6, 6),
[F_BSTLOWVIM] = REG_FIELD(RT9455_REG_MASK3, 5, 5),
[F_BST32SIM] = REG_FIELD(RT9455_REG_MASK3, 3, 3),
};
#define GET_MASK(fid) (BIT(rt9455_reg_fields[fid].msb + 1) - \
BIT(rt9455_reg_fields[fid].lsb))
/*
* Each array initialised below shows the possible real-world values for a
* group of bits belonging to RT9455 registers. The arrays are sorted in
* ascending order. The index of each real-world value represents the value
* that is encoded in the group of bits belonging to RT9455 registers.
*/
/* REG06[6:4] (ICHRG) in uAh */
static const int rt9455_ichrg_values[] = {
500000, 650000, 800000, 950000, 1100000, 1250000, 1400000, 1550000
};
/*
* When the charger is in charge mode, REG02[7:2] represent battery regulation
* voltage.
*/
/* REG02[7:2] (VOREG) in uV */
static const int rt9455_voreg_values[] = {
3500000, 3520000, 3540000, 3560000, 3580000, 3600000, 3620000, 3640000,
3660000, 3680000, 3700000, 3720000, 3740000, 3760000, 3780000, 3800000,
3820000, 3840000, 3860000, 3880000, 3900000, 3920000, 3940000, 3960000,
3980000, 4000000, 4020000, 4040000, 4060000, 4080000, 4100000, 4120000,
4140000, 4160000, 4180000, 4200000, 4220000, 4240000, 4260000, 4280000,
4300000, 4330000, 4350000, 4370000, 4390000, 4410000, 4430000, 4450000,
4450000, 4450000, 4450000, 4450000, 4450000, 4450000, 4450000, 4450000,
4450000, 4450000, 4450000, 4450000, 4450000, 4450000, 4450000, 4450000
};
/*
* When the charger is in boost mode, REG02[7:2] represent boost output
* voltage.
*/
/* REG02[7:2] (Boost output voltage) in uV */
static const int rt9455_boost_voltage_values[] = {
4425000, 4450000, 4475000, 4500000, 4525000, 4550000, 4575000, 4600000,
4625000, 4650000, 4675000, 4700000, 4725000, 4750000, 4775000, 4800000,
4825000, 4850000, 4875000, 4900000, 4925000, 4950000, 4975000, 5000000,
5025000, 5050000, 5075000, 5100000, 5125000, 5150000, 5175000, 5200000,
5225000, 5250000, 5275000, 5300000, 5325000, 5350000, 5375000, 5400000,
5425000, 5450000, 5475000, 5500000, 5525000, 5550000, 5575000, 5600000,
5600000, 5600000, 5600000, 5600000, 5600000, 5600000, 5600000, 5600000,
5600000, 5600000, 5600000, 5600000, 5600000, 5600000, 5600000, 5600000,
};
/* REG07[3:0] (VMREG) in uV */
static const int rt9455_vmreg_values[] = {
4200000, 4220000, 4240000, 4260000, 4280000, 4300000, 4320000, 4340000,
4360000, 4380000, 4400000, 4430000, 4450000, 4450000, 4450000, 4450000
};
/* REG05[5:4] (IEOC_PERCENTAGE) */
static const int rt9455_ieoc_percentage_values[] = {
10, 30, 20, 30
};
/* REG05[1:0] (MIVR) in uV */
static const int rt9455_mivr_values[] = {
4000000, 4250000, 4500000, 5000000
};
/* REG05[1:0] (IAICR) in uA */
static const int rt9455_iaicr_values[] = {
100000, 500000, 1000000, 2000000
};
struct rt9455_info {
struct i2c_client *client;
struct regmap *regmap;
struct regmap_field *regmap_fields[F_MAX_FIELDS];
struct power_supply *charger;
#if IS_ENABLED(CONFIG_USB_PHY)
struct usb_phy *usb_phy;
struct notifier_block nb;
#endif
struct delayed_work pwr_rdy_work;
struct delayed_work max_charging_time_work;
struct delayed_work batt_presence_work;
u32 voreg;
u32 boost_voltage;
};
/*
* Iterate through each element of the 'tbl' array until an element whose value
* is greater than v is found. Return the index of the respective element,
* or the index of the last element in the array, if no such element is found.
*/
static unsigned int rt9455_find_idx(const int tbl[], int tbl_size, int v)
{
int i;
/*
* No need to iterate until the last index in the table because
* if no element greater than v is found in the table,
* or if only the last element is greater than v,
* function returns the index of the last element.
*/
for (i = 0; i < tbl_size - 1; i++)
if (v <= tbl[i])
return i;
return (tbl_size - 1);
}
static int rt9455_get_field_val(struct rt9455_info *info,
enum rt9455_fields field,
const int tbl[], int tbl_size, int *val)
{
unsigned int v;
int ret;
ret = regmap_field_read(info->regmap_fields[field], &v);
if (ret)
return ret;
v = (v >= tbl_size) ? (tbl_size - 1) : v;
*val = tbl[v];
return 0;
}
static int rt9455_set_field_val(struct rt9455_info *info,
enum rt9455_fields field,
const int tbl[], int tbl_size, int val)
{
unsigned int idx = rt9455_find_idx(tbl, tbl_size, val);
return regmap_field_write(info->regmap_fields[field], idx);
}
static int rt9455_register_reset(struct rt9455_info *info)
{
struct device *dev = &info->client->dev;
unsigned int v;
int ret, limit = 100;
ret = regmap_field_write(info->regmap_fields[F_RST], 0x01);
if (ret) {
dev_err(dev, "Failed to set RST bit\n");
return ret;
}
/*
* To make sure that reset operation has finished, loop until RST bit
* is set to 0.
*/
do {
ret = regmap_field_read(info->regmap_fields[F_RST], &v);
if (ret) {
dev_err(dev, "Failed to read RST bit\n");
return ret;
}
if (!v)
break;
usleep_range(10, 100);
} while (--limit);
if (!limit)
return -EIO;
return 0;
}
/* Charger power supply property routines */
static enum power_supply_property rt9455_charger_properties[] = {
POWER_SUPPLY_PROP_STATUS,
POWER_SUPPLY_PROP_HEALTH,
POWER_SUPPLY_PROP_PRESENT,
POWER_SUPPLY_PROP_ONLINE,
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_SCOPE,
POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT,
POWER_SUPPLY_PROP_MODEL_NAME,
POWER_SUPPLY_PROP_MANUFACTURER,
};
static char *rt9455_charger_supplied_to[] = {
"main-battery",
};
static int rt9455_charger_get_status(struct rt9455_info *info,
union power_supply_propval *val)
{
unsigned int v, pwr_rdy;
int ret;
ret = regmap_field_read(info->regmap_fields[F_PWR_RDY],
&pwr_rdy);
if (ret) {
dev_err(&info->client->dev, "Failed to read PWR_RDY bit\n");
return ret;
}
/*
* If PWR_RDY bit is unset, the battery is discharging. Otherwise,
* STAT bits value must be checked.
*/
if (!pwr_rdy) {
val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
return 0;
}
ret = regmap_field_read(info->regmap_fields[F_STAT], &v);
if (ret) {
dev_err(&info->client->dev, "Failed to read STAT bits\n");
return ret;
}
switch (v) {
case 0:
/*
* If PWR_RDY bit is set, but STAT bits value is 0, the charger
* may be in one of the following cases:
* 1. CHG_EN bit is 0.
* 2. CHG_EN bit is 1 but the battery is not connected.
* In any of these cases, POWER_SUPPLY_STATUS_NOT_CHARGING is
* returned.
*/
val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
return 0;
case 1:
val->intval = POWER_SUPPLY_STATUS_CHARGING;
return 0;
case 2:
val->intval = POWER_SUPPLY_STATUS_FULL;
return 0;
default:
val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
return 0;
}
}
static int rt9455_charger_get_health(struct rt9455_info *info,
union power_supply_propval *val)
{
struct device *dev = &info->client->dev;
unsigned int v;
int ret;
val->intval = POWER_SUPPLY_HEALTH_GOOD;
ret = regmap_read(info->regmap, RT9455_REG_IRQ1, &v);
if (ret) {
dev_err(dev, "Failed to read IRQ1 register\n");
return ret;
}
if (v & GET_MASK(F_TSDI)) {
val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
return 0;
}
if (v & GET_MASK(F_VINOVPI)) {
val->intval = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
return 0;
}
if (v & GET_MASK(F_BATAB)) {
val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
return 0;
}
ret = regmap_read(info->regmap, RT9455_REG_IRQ2, &v);
if (ret) {
dev_err(dev, "Failed to read IRQ2 register\n");
return ret;
}
if (v & GET_MASK(F_CHBATOVI)) {
val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
return 0;
}
if (v & GET_MASK(F_CH32MI)) {
val->intval = POWER_SUPPLY_HEALTH_SAFETY_TIMER_EXPIRE;
return 0;
}
ret = regmap_read(info->regmap, RT9455_REG_IRQ3, &v);
if (ret) {
dev_err(dev, "Failed to read IRQ3 register\n");
return ret;
}
if (v & GET_MASK(F_BSTBUSOVI)) {
val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
return 0;
}
if (v & GET_MASK(F_BSTOLI)) {
val->intval = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
return 0;
}
if (v & GET_MASK(F_BSTLOWVI)) {
val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
return 0;
}
if (v & GET_MASK(F_BST32SI)) {
val->intval = POWER_SUPPLY_HEALTH_SAFETY_TIMER_EXPIRE;
return 0;
}
ret = regmap_field_read(info->regmap_fields[F_STAT], &v);
if (ret) {
dev_err(dev, "Failed to read STAT bits\n");
return ret;
}
if (v == RT9455_FAULT) {
val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
return 0;
}
return 0;
}
static int rt9455_charger_get_battery_presence(struct rt9455_info *info,
union power_supply_propval *val)
{
unsigned int v;
int ret;
ret = regmap_field_read(info->regmap_fields[F_BATAB], &v);
if (ret) {
dev_err(&info->client->dev, "Failed to read BATAB bit\n");
return ret;
}
/*
* Since BATAB is 1 when battery is NOT present and 0 otherwise,
* !BATAB is returned.
*/
val->intval = !v;
return 0;
}
static int rt9455_charger_get_online(struct rt9455_info *info,
union power_supply_propval *val)
{
unsigned int v;
int ret;
ret = regmap_field_read(info->regmap_fields[F_PWR_RDY], &v);
if (ret) {
dev_err(&info->client->dev, "Failed to read PWR_RDY bit\n");
return ret;
}
val->intval = (int)v;
return 0;
}
static int rt9455_charger_get_current(struct rt9455_info *info,
union power_supply_propval *val)
{
int curr;
int ret;
ret = rt9455_get_field_val(info, F_ICHRG,
rt9455_ichrg_values,
ARRAY_SIZE(rt9455_ichrg_values),
&curr);
if (ret) {
dev_err(&info->client->dev, "Failed to read ICHRG value\n");
return ret;
}
val->intval = curr;
return 0;
}
static int rt9455_charger_get_current_max(struct rt9455_info *info,
union power_supply_propval *val)
{
int idx = ARRAY_SIZE(rt9455_ichrg_values) - 1;
val->intval = rt9455_ichrg_values[idx];
return 0;
}
static int rt9455_charger_get_voltage(struct rt9455_info *info,
union power_supply_propval *val)
{
int voltage;
int ret;
ret = rt9455_get_field_val(info, F_VOREG,
rt9455_voreg_values,
ARRAY_SIZE(rt9455_voreg_values),
&voltage);
if (ret) {
dev_err(&info->client->dev, "Failed to read VOREG value\n");
return ret;
}
val->intval = voltage;
return 0;
}
static int rt9455_charger_get_voltage_max(struct rt9455_info *info,
union power_supply_propval *val)
{
int idx = ARRAY_SIZE(rt9455_vmreg_values) - 1;
val->intval = rt9455_vmreg_values[idx];
return 0;
}
static int rt9455_charger_get_term_current(struct rt9455_info *info,
union power_supply_propval *val)
{
struct device *dev = &info->client->dev;
int ichrg, ieoc_percentage, ret;
ret = rt9455_get_field_val(info, F_ICHRG,
rt9455_ichrg_values,
ARRAY_SIZE(rt9455_ichrg_values),
&ichrg);
if (ret) {
dev_err(dev, "Failed to read ICHRG value\n");
return ret;
}
ret = rt9455_get_field_val(info, F_IEOC_PERCENTAGE,
rt9455_ieoc_percentage_values,
ARRAY_SIZE(rt9455_ieoc_percentage_values),
&ieoc_percentage);
if (ret) {
dev_err(dev, "Failed to read IEOC value\n");
return ret;
}
val->intval = ichrg * ieoc_percentage / 100;
return 0;
}
static int rt9455_charger_get_property(struct power_supply *psy,
enum power_supply_property psp,
union power_supply_propval *val)
{
struct rt9455_info *info = power_supply_get_drvdata(psy);
switch (psp) {
case POWER_SUPPLY_PROP_STATUS:
return rt9455_charger_get_status(info, val);
case POWER_SUPPLY_PROP_HEALTH:
return rt9455_charger_get_health(info, val);
case POWER_SUPPLY_PROP_PRESENT:
return rt9455_charger_get_battery_presence(info, val);
case POWER_SUPPLY_PROP_ONLINE:
return rt9455_charger_get_online(info, val);
case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
return rt9455_charger_get_current(info, val);
case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX:
return rt9455_charger_get_current_max(info, val);
case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
return rt9455_charger_get_voltage(info, val);
case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX:
return rt9455_charger_get_voltage_max(info, val);
case POWER_SUPPLY_PROP_SCOPE:
val->intval = POWER_SUPPLY_SCOPE_SYSTEM;
return 0;
case POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT:
return rt9455_charger_get_term_current(info, val);
case POWER_SUPPLY_PROP_MODEL_NAME:
val->strval = RT9455_MODEL_NAME;
return 0;
case POWER_SUPPLY_PROP_MANUFACTURER:
val->strval = RT9455_MANUFACTURER;
return 0;
default:
return -ENODATA;
}
}
static int rt9455_hw_init(struct rt9455_info *info, u32 ichrg,
u32 ieoc_percentage,
u32 mivr, u32 iaicr)
{
struct device *dev = &info->client->dev;
int idx, ret;
ret = rt9455_register_reset(info);
if (ret) {
dev_err(dev, "Power On Reset failed\n");
return ret;
}
/* Set TE bit in order to enable end of charge detection */
ret = regmap_field_write(info->regmap_fields[F_TE], 1);
if (ret) {
dev_err(dev, "Failed to set TE bit\n");
return ret;
}
/* Set TE_SHDN_EN bit in order to enable end of charge detection */
ret = regmap_field_write(info->regmap_fields[F_TE_SHDN_EN], 1);
if (ret) {
dev_err(dev, "Failed to set TE_SHDN_EN bit\n");
return ret;
}
/*
* Set BATD_EN bit in order to enable battery detection
* when charging is done
*/
ret = regmap_field_write(info->regmap_fields[F_BATD_EN], 1);
if (ret) {
dev_err(dev, "Failed to set BATD_EN bit\n");
return ret;
}
/*
* Disable Safety Timer. In charge mode, this timer terminates charging
* if no read or write via I2C is done within 32 minutes. This timer
* avoids overcharging the baterry when the OS is not loaded and the
* charger is connected to a power source.
* In boost mode, this timer triggers BST32SI interrupt if no read or
* write via I2C is done within 32 seconds.
* When the OS is loaded and the charger driver is inserted, it is used
* delayed_work, named max_charging_time_work, to avoid overcharging
* the battery.
*/
ret = regmap_field_write(info->regmap_fields[F_TMR_EN], 0x00);
if (ret) {
dev_err(dev, "Failed to disable Safety Timer\n");
return ret;
}
/* Set ICHRG to value retrieved from device-specific data */
ret = rt9455_set_field_val(info, F_ICHRG,
rt9455_ichrg_values,
ARRAY_SIZE(rt9455_ichrg_values), ichrg);
if (ret) {
dev_err(dev, "Failed to set ICHRG value\n");
return ret;
}
/* Set IEOC Percentage to value retrieved from device-specific data */
ret = rt9455_set_field_val(info, F_IEOC_PERCENTAGE,
rt9455_ieoc_percentage_values,
ARRAY_SIZE(rt9455_ieoc_percentage_values),
ieoc_percentage);
if (ret) {
dev_err(dev, "Failed to set IEOC Percentage value\n");
return ret;
}
/* Set VOREG to value retrieved from device-specific data */
ret = rt9455_set_field_val(info, F_VOREG,
rt9455_voreg_values,
ARRAY_SIZE(rt9455_voreg_values),
info->voreg);
if (ret) {
dev_err(dev, "Failed to set VOREG value\n");
return ret;
}
/* Set VMREG value to maximum (4.45V). */
idx = ARRAY_SIZE(rt9455_vmreg_values) - 1;
ret = rt9455_set_field_val(info, F_VMREG,
rt9455_vmreg_values,
ARRAY_SIZE(rt9455_vmreg_values),
rt9455_vmreg_values[idx]);
if (ret) {
dev_err(dev, "Failed to set VMREG value\n");
return ret;
}
/*
* Set MIVR to value retrieved from device-specific data.
* If no value is specified, default value for MIVR is 4.5V.
*/
if (mivr == -1)
mivr = 4500000;
ret = rt9455_set_field_val(info, F_MIVR,
rt9455_mivr_values,
ARRAY_SIZE(rt9455_mivr_values), mivr);
if (ret) {
dev_err(dev, "Failed to set MIVR value\n");
return ret;
}
/*
* Set IAICR to value retrieved from device-specific data.
* If no value is specified, default value for IAICR is 500 mA.
*/
if (iaicr == -1)
iaicr = 500000;
ret = rt9455_set_field_val(info, F_IAICR,
rt9455_iaicr_values,
ARRAY_SIZE(rt9455_iaicr_values), iaicr);
if (ret) {
dev_err(dev, "Failed to set IAICR value\n");
return ret;
}
/*
* Set IAICR_INT bit so that IAICR value is determined by IAICR bits
* and not by OTG pin.
*/
ret = regmap_field_write(info->regmap_fields[F_IAICR_INT], 0x01);
if (ret) {
dev_err(dev, "Failed to set IAICR_INT bit\n");
return ret;
}
/*
* Disable CHMIVRI interrupt. Because the driver sets MIVR value,
* CHMIVRI is triggered, but there is no action to be taken by the
* driver when CHMIVRI is triggered.
*/
ret = regmap_field_write(info->regmap_fields[F_CHMIVRIM], 0x01);
if (ret) {
dev_err(dev, "Failed to mask CHMIVRI interrupt\n");
return ret;
}
return 0;
}
#if IS_ENABLED(CONFIG_USB_PHY)
/*
* Before setting the charger into boost mode, boost output voltage is
* set. This is needed because boost output voltage may differ from battery
* regulation voltage. F_VOREG bits represent either battery regulation voltage
* or boost output voltage, depending on the mode the charger is. Both battery
* regulation voltage and boost output voltage are read from DT/ACPI during
* probe.
*/
static int rt9455_set_boost_voltage_before_boost_mode(struct rt9455_info *info)
{
struct device *dev = &info->client->dev;
int ret;
ret = rt9455_set_field_val(info, F_VOREG,
rt9455_boost_voltage_values,
ARRAY_SIZE(rt9455_boost_voltage_values),
info->boost_voltage);
if (ret) {
dev_err(dev, "Failed to set boost output voltage value\n");
return ret;
}
return 0;
}
#endif
/*
* Before setting the charger into charge mode, battery regulation voltage is
* set. This is needed because boost output voltage may differ from battery
* regulation voltage. F_VOREG bits represent either battery regulation voltage
* or boost output voltage, depending on the mode the charger is. Both battery
* regulation voltage and boost output voltage are read from DT/ACPI during
* probe.
*/
static int rt9455_set_voreg_before_charge_mode(struct rt9455_info *info)
{
struct device *dev = &info->client->dev;
int ret;
ret = rt9455_set_field_val(info, F_VOREG,
rt9455_voreg_values,
ARRAY_SIZE(rt9455_voreg_values),
info->voreg);
if (ret) {
dev_err(dev, "Failed to set VOREG value\n");
return ret;
}
return 0;
}
static int rt9455_irq_handler_check_irq1_register(struct rt9455_info *info,
bool *_is_battery_absent,
bool *_alert_userspace)
{
unsigned int irq1, mask1, mask2;
struct device *dev = &info->client->dev;
bool is_battery_absent = false;
bool alert_userspace = false;
int ret;
ret = regmap_read(info->regmap, RT9455_REG_IRQ1, &irq1);
if (ret) {
dev_err(dev, "Failed to read IRQ1 register\n");
return ret;
}
ret = regmap_read(info->regmap, RT9455_REG_MASK1, &mask1);
if (ret) {
dev_err(dev, "Failed to read MASK1 register\n");
return ret;
}
if (irq1 & GET_MASK(F_TSDI)) {
dev_err(dev, "Thermal shutdown fault occurred\n");
alert_userspace = true;
}
if (irq1 & GET_MASK(F_VINOVPI)) {
dev_err(dev, "Overvoltage input occurred\n");
alert_userspace = true;
}
if (irq1 & GET_MASK(F_BATAB)) {
dev_err(dev, "Battery absence occurred\n");
is_battery_absent = true;
alert_userspace = true;
if ((mask1 & GET_MASK(F_BATABM)) == 0) {
ret = regmap_field_write(info->regmap_fields[F_BATABM],
0x01);
if (ret) {
dev_err(dev, "Failed to mask BATAB interrupt\n");
return ret;
}
}
ret = regmap_read(info->regmap, RT9455_REG_MASK2, &mask2);
if (ret) {
dev_err(dev, "Failed to read MASK2 register\n");
return ret;
}
if (mask2 & GET_MASK(F_CHTERMIM)) {
ret = regmap_field_write(
info->regmap_fields[F_CHTERMIM], 0x00);
if (ret) {
dev_err(dev, "Failed to unmask CHTERMI interrupt\n");
return ret;
}
}
if (mask2 & GET_MASK(F_CHRCHGIM)) {
ret = regmap_field_write(
info->regmap_fields[F_CHRCHGIM], 0x00);
if (ret) {
dev_err(dev, "Failed to unmask CHRCHGI interrupt\n");
return ret;
}
}
/*
* When the battery is absent, max_charging_time_work is
* cancelled, since no charging is done.
*/
cancel_delayed_work_sync(&info->max_charging_time_work);
/*
* Since no interrupt is triggered when the battery is
* reconnected, max_charging_time_work is not rescheduled.
* Therefore, batt_presence_work is scheduled to check whether
* the battery is still absent or not.
*/
queue_delayed_work(system_power_efficient_wq,
&info->batt_presence_work,
RT9455_BATT_PRESENCE_DELAY * HZ);
}
*_is_battery_absent = is_battery_absent;
if (alert_userspace)
*_alert_userspace = alert_userspace;
return 0;
}
static int rt9455_irq_handler_check_irq2_register(struct rt9455_info *info,
bool is_battery_absent,
bool *_alert_userspace)
{
unsigned int irq2, mask2;
struct device *dev = &info->client->dev;
bool alert_userspace = false;
int ret;
ret = regmap_read(info->regmap, RT9455_REG_IRQ2, &irq2);
if (ret) {
dev_err(dev, "Failed to read IRQ2 register\n");
return ret;
}
ret = regmap_read(info->regmap, RT9455_REG_MASK2, &mask2);
if (ret) {
dev_err(dev, "Failed to read MASK2 register\n");
return ret;
}
if (irq2 & GET_MASK(F_CHRVPI)) {
dev_dbg(dev, "Charger fault occurred\n");
/*
* CHRVPI bit is set in 2 cases:
* 1. when the power source is connected to the charger.
* 2. when the power source is disconnected from the charger.
* To identify the case, PWR_RDY bit is checked. Because
* PWR_RDY bit is set / cleared after CHRVPI interrupt is
* triggered, it is used delayed_work to later read PWR_RDY bit.
* Also, do not set to true alert_userspace, because there is no
* need to notify userspace when CHRVPI interrupt has occurred.
* Userspace will be notified after PWR_RDY bit is read.
*/
queue_delayed_work(system_power_efficient_wq,
&info->pwr_rdy_work,
RT9455_PWR_RDY_DELAY * HZ);
}
if (irq2 & GET_MASK(F_CHBATOVI)) {
dev_err(dev, "Battery OVP occurred\n");
alert_userspace = true;
}
if (irq2 & GET_MASK(F_CHTERMI)) {
dev_dbg(dev, "Charge terminated\n");
if (!is_battery_absent) {
if ((mask2 & GET_MASK(F_CHTERMIM)) == 0) {
ret = regmap_field_write(
info->regmap_fields[F_CHTERMIM], 0x01);
if (ret) {
dev_err(dev, "Failed to mask CHTERMI interrupt\n");
return ret;
}
/*
* Update MASK2 value, since CHTERMIM bit is
* set.
*/
mask2 = mask2 | GET_MASK(F_CHTERMIM);
}
cancel_delayed_work_sync(&info->max_charging_time_work);
alert_userspace = true;
}
}
if (irq2 & GET_MASK(F_CHRCHGI)) {
dev_dbg(dev, "Recharge request\n");
ret = regmap_field_write(info->regmap_fields[F_CHG_EN],
RT9455_CHARGE_ENABLE);
if (ret) {
dev_err(dev, "Failed to enable charging\n");
return ret;
}
if (mask2 & GET_MASK(F_CHTERMIM)) {
ret = regmap_field_write(
info->regmap_fields[F_CHTERMIM], 0x00);
if (ret) {
dev_err(dev, "Failed to unmask CHTERMI interrupt\n");
return ret;
}
/* Update MASK2 value, since CHTERMIM bit is cleared. */
mask2 = mask2 & ~GET_MASK(F_CHTERMIM);
}
if (!is_battery_absent) {
/*
* No need to check whether the charger is connected to
* power source when CHRCHGI is received, since CHRCHGI
* is not triggered if the charger is not connected to
* the power source.
*/
queue_delayed_work(system_power_efficient_wq,
&info->max_charging_time_work,
RT9455_MAX_CHARGING_TIME * HZ);
alert_userspace = true;
}
}
if (irq2 & GET_MASK(F_CH32MI)) {
dev_err(dev, "Charger fault. 32 mins timeout occurred\n");
alert_userspace = true;
}
if (irq2 & GET_MASK(F_CHTREGI)) {
dev_warn(dev,
"Charger warning. Thermal regulation loop active\n");
alert_userspace = true;
}
if (irq2 & GET_MASK(F_CHMIVRI)) {
dev_dbg(dev,
"Charger warning. Input voltage MIVR loop active\n");
}
if (alert_userspace)
*_alert_userspace = alert_userspace;
return 0;
}
static int rt9455_irq_handler_check_irq3_register(struct rt9455_info *info,
bool *_alert_userspace)
{
unsigned int irq3, mask3;
struct device *dev = &info->client->dev;
bool alert_userspace = false;
int ret;
ret = regmap_read(info->regmap, RT9455_REG_IRQ3, &irq3);
if (ret) {
dev_err(dev, "Failed to read IRQ3 register\n");
return ret;
}
ret = regmap_read(info->regmap, RT9455_REG_MASK3, &mask3);
if (ret) {
dev_err(dev, "Failed to read MASK3 register\n");
return ret;
}
if (irq3 & GET_MASK(F_BSTBUSOVI)) {
dev_err(dev, "Boost fault. Overvoltage input occurred\n");
alert_userspace = true;
}
if (irq3 & GET_MASK(F_BSTOLI)) {
dev_err(dev, "Boost fault. Overload\n");
alert_userspace = true;
}
if (irq3 & GET_MASK(F_BSTLOWVI)) {
dev_err(dev, "Boost fault. Battery voltage too low\n");
alert_userspace = true;
}
if (irq3 & GET_MASK(F_BST32SI)) {
dev_err(dev, "Boost fault. 32 seconds timeout occurred.\n");
alert_userspace = true;
}
if (alert_userspace) {
dev_info(dev, "Boost fault occurred, therefore the charger goes into charge mode\n");
ret = rt9455_set_voreg_before_charge_mode(info);
if (ret) {
dev_err(dev, "Failed to set VOREG before entering charge mode\n");
return ret;
}
ret = regmap_field_write(info->regmap_fields[F_OPA_MODE],
RT9455_CHARGE_MODE);
if (ret) {
dev_err(dev, "Failed to set charger in charge mode\n");
return ret;
}
*_alert_userspace = alert_userspace;
}
return 0;
}
static irqreturn_t rt9455_irq_handler_thread(int irq, void *data)
{
struct rt9455_info *info = data;
struct device *dev;
bool alert_userspace = false;
bool is_battery_absent = false;
unsigned int status;
int ret;
if (!info)
return IRQ_NONE;
dev = &info->client->dev;
if (irq != info->client->irq) {
dev_err(dev, "Interrupt is not for RT9455 charger\n");
return IRQ_NONE;
}
ret = regmap_field_read(info->regmap_fields[F_STAT], &status);
if (ret) {
dev_err(dev, "Failed to read STAT bits\n");
return IRQ_HANDLED;
}
dev_dbg(dev, "Charger status is %d\n", status);
/*
* Each function that processes an IRQ register receives as output
* parameter alert_userspace pointer. alert_userspace is set to true
* in such a function only if an interrupt has occurred in the
* respective interrupt register. This way, it is avoided the following
* case: interrupt occurs only in IRQ1 register,
* rt9455_irq_handler_check_irq1_register() function sets to true
* alert_userspace, but rt9455_irq_handler_check_irq2_register()
* and rt9455_irq_handler_check_irq3_register() functions set to false
* alert_userspace and power_supply_changed() is never called.
*/
ret = rt9455_irq_handler_check_irq1_register(info, &is_battery_absent,
&alert_userspace);
if (ret) {
dev_err(dev, "Failed to handle IRQ1 register\n");
return IRQ_HANDLED;
}
ret = rt9455_irq_handler_check_irq2_register(info, is_battery_absent,
&alert_userspace);
if (ret) {
dev_err(dev, "Failed to handle IRQ2 register\n");
return IRQ_HANDLED;
}
ret = rt9455_irq_handler_check_irq3_register(info, &alert_userspace);
if (ret) {
dev_err(dev, "Failed to handle IRQ3 register\n");
return IRQ_HANDLED;
}
if (alert_userspace) {
/*
* Sometimes, an interrupt occurs while rt9455_probe() function
* is executing and power_supply_register() is not yet called.
* Do not call power_supply_changed() in this case.
*/
if (info->charger)
power_supply_changed(info->charger);
}
return IRQ_HANDLED;
}
static int rt9455_discover_charger(struct rt9455_info *info, u32 *ichrg,
u32 *ieoc_percentage,
u32 *mivr, u32 *iaicr)
{
struct device *dev = &info->client->dev;
int ret;
if (!dev->of_node && !ACPI_HANDLE(dev)) {
dev_err(dev, "No support for either device tree or ACPI\n");
return -EINVAL;
}
/*
* ICHRG, IEOC_PERCENTAGE, VOREG and boost output voltage are mandatory
* parameters.
*/
ret = device_property_read_u32(dev, "richtek,output-charge-current",
ichrg);
if (ret) {
dev_err(dev, "Error: missing \"output-charge-current\" property\n");
return ret;
}
ret = device_property_read_u32(dev, "richtek,end-of-charge-percentage",
ieoc_percentage);
if (ret) {
dev_err(dev, "Error: missing \"end-of-charge-percentage\" property\n");
return ret;
}
ret = device_property_read_u32(dev,
"richtek,battery-regulation-voltage",
&info->voreg);
if (ret) {
dev_err(dev, "Error: missing \"battery-regulation-voltage\" property\n");
return ret;
}
ret = device_property_read_u32(dev, "richtek,boost-output-voltage",
&info->boost_voltage);
if (ret) {
dev_err(dev, "Error: missing \"boost-output-voltage\" property\n");
return ret;
}
/*
* MIVR and IAICR are optional parameters. Do not return error if one of
* them is not present in ACPI table or device tree specification.
*/
device_property_read_u32(dev, "richtek,min-input-voltage-regulation",
mivr);
device_property_read_u32(dev, "richtek,avg-input-current-regulation",
iaicr);
return 0;
}
#if IS_ENABLED(CONFIG_USB_PHY)
static int rt9455_usb_event_none(struct rt9455_info *info,
u8 opa_mode, u8 iaicr)
{
struct device *dev = &info->client->dev;
int ret;
if (opa_mode == RT9455_BOOST_MODE) {
ret = rt9455_set_voreg_before_charge_mode(info);
if (ret) {
dev_err(dev, "Failed to set VOREG before entering charge mode\n");
return ret;
}
/*
* If the charger is in boost mode, and it has received
* USB_EVENT_NONE, this means the consumer device powered by the
* charger is not connected anymore.
* In this case, the charger goes into charge mode.
*/
dev_dbg(dev, "USB_EVENT_NONE received, therefore the charger goes into charge mode\n");
ret = regmap_field_write(info->regmap_fields[F_OPA_MODE],
RT9455_CHARGE_MODE);
if (ret) {
dev_err(dev, "Failed to set charger in charge mode\n");
return NOTIFY_DONE;
}
}
dev_dbg(dev, "USB_EVENT_NONE received, therefore IAICR is set to its minimum value\n");
if (iaicr != RT9455_IAICR_100MA) {
ret = regmap_field_write(info->regmap_fields[F_IAICR],
RT9455_IAICR_100MA);
if (ret) {
dev_err(dev, "Failed to set IAICR value\n");
return NOTIFY_DONE;
}
}
return NOTIFY_OK;
}
static int rt9455_usb_event_vbus(struct rt9455_info *info,
u8 opa_mode, u8 iaicr)
{
struct device *dev = &info->client->dev;
int ret;
if (opa_mode == RT9455_BOOST_MODE) {
ret = rt9455_set_voreg_before_charge_mode(info);
if (ret) {
dev_err(dev, "Failed to set VOREG before entering charge mode\n");
return ret;
}
/*
* If the charger is in boost mode, and it has received
* USB_EVENT_VBUS, this means the consumer device powered by the
* charger is not connected anymore.
* In this case, the charger goes into charge mode.
*/
dev_dbg(dev, "USB_EVENT_VBUS received, therefore the charger goes into charge mode\n");
ret = regmap_field_write(info->regmap_fields[F_OPA_MODE],
RT9455_CHARGE_MODE);
if (ret) {
dev_err(dev, "Failed to set charger in charge mode\n");
return NOTIFY_DONE;
}
}
dev_dbg(dev, "USB_EVENT_VBUS received, therefore IAICR is set to 500 mA\n");
if (iaicr != RT9455_IAICR_500MA) {
ret = regmap_field_write(info->regmap_fields[F_IAICR],
RT9455_IAICR_500MA);
if (ret) {
dev_err(dev, "Failed to set IAICR value\n");
return NOTIFY_DONE;
}
}
return NOTIFY_OK;
}
static int rt9455_usb_event_id(struct rt9455_info *info,
u8 opa_mode, u8 iaicr)
{
struct device *dev = &info->client->dev;
int ret;
if (opa_mode == RT9455_CHARGE_MODE) {
ret = rt9455_set_boost_voltage_before_boost_mode(info);
if (ret) {
dev_err(dev, "Failed to set boost output voltage before entering boost mode\n");
return ret;
}
/*
* If the charger is in charge mode, and it has received
* USB_EVENT_ID, this means a consumer device is connected and
* it should be powered by the charger.
* In this case, the charger goes into boost mode.
*/
dev_dbg(dev, "USB_EVENT_ID received, therefore the charger goes into boost mode\n");
ret = regmap_field_write(info->regmap_fields[F_OPA_MODE],
RT9455_BOOST_MODE);
if (ret) {
dev_err(dev, "Failed to set charger in boost mode\n");
return NOTIFY_DONE;
}
}
dev_dbg(dev, "USB_EVENT_ID received, therefore IAICR is set to its minimum value\n");
if (iaicr != RT9455_IAICR_100MA) {
ret = regmap_field_write(info->regmap_fields[F_IAICR],
RT9455_IAICR_100MA);
if (ret) {
dev_err(dev, "Failed to set IAICR value\n");
return NOTIFY_DONE;
}
}
return NOTIFY_OK;
}
static int rt9455_usb_event_charger(struct rt9455_info *info,
u8 opa_mode, u8 iaicr)
{
struct device *dev = &info->client->dev;
int ret;
if (opa_mode == RT9455_BOOST_MODE) {
ret = rt9455_set_voreg_before_charge_mode(info);
if (ret) {
dev_err(dev, "Failed to set VOREG before entering charge mode\n");
return ret;
}
/*
* If the charger is in boost mode, and it has received
* USB_EVENT_CHARGER, this means the consumer device powered by
* the charger is not connected anymore.
* In this case, the charger goes into charge mode.
*/
dev_dbg(dev, "USB_EVENT_CHARGER received, therefore the charger goes into charge mode\n");
ret = regmap_field_write(info->regmap_fields[F_OPA_MODE],
RT9455_CHARGE_MODE);
if (ret) {
dev_err(dev, "Failed to set charger in charge mode\n");
return NOTIFY_DONE;
}
}
dev_dbg(dev, "USB_EVENT_CHARGER received, therefore IAICR is set to no current limit\n");
if (iaicr != RT9455_IAICR_NO_LIMIT) {
ret = regmap_field_write(info->regmap_fields[F_IAICR],
RT9455_IAICR_NO_LIMIT);
if (ret) {
dev_err(dev, "Failed to set IAICR value\n");
return NOTIFY_DONE;
}
}
return NOTIFY_OK;
}
static int rt9455_usb_event(struct notifier_block *nb,
unsigned long event, void *power)
{
struct rt9455_info *info = container_of(nb, struct rt9455_info, nb);
struct device *dev = &info->client->dev;
unsigned int opa_mode, iaicr;
int ret;
/*
* Determine whether the charger is in charge mode
* or in boost mode.
*/
ret = regmap_field_read(info->regmap_fields[F_OPA_MODE],
&opa_mode);
if (ret) {
dev_err(dev, "Failed to read OPA_MODE value\n");
return NOTIFY_DONE;
}
ret = regmap_field_read(info->regmap_fields[F_IAICR],
&iaicr);
if (ret) {
dev_err(dev, "Failed to read IAICR value\n");
return NOTIFY_DONE;
}
dev_dbg(dev, "Received USB event %lu\n", event);
switch (event) {
case USB_EVENT_NONE:
return rt9455_usb_event_none(info, opa_mode, iaicr);
case USB_EVENT_VBUS:
return rt9455_usb_event_vbus(info, opa_mode, iaicr);
case USB_EVENT_ID:
return rt9455_usb_event_id(info, opa_mode, iaicr);
case USB_EVENT_CHARGER:
return rt9455_usb_event_charger(info, opa_mode, iaicr);
default:
dev_err(dev, "Unknown USB event\n");
}
return NOTIFY_DONE;
}
#endif
static void rt9455_pwr_rdy_work_callback(struct work_struct *work)
{
struct rt9455_info *info = container_of(work, struct rt9455_info,
pwr_rdy_work.work);
struct device *dev = &info->client->dev;
unsigned int pwr_rdy;
int ret;
ret = regmap_field_read(info->regmap_fields[F_PWR_RDY], &pwr_rdy);
if (ret) {
dev_err(dev, "Failed to read PWR_RDY bit\n");
return;
}
switch (pwr_rdy) {
case RT9455_PWR_FAULT:
dev_dbg(dev, "Charger disconnected from power source\n");
cancel_delayed_work_sync(&info->max_charging_time_work);
break;
case RT9455_PWR_GOOD:
dev_dbg(dev, "Charger connected to power source\n");
ret = regmap_field_write(info->regmap_fields[F_CHG_EN],
RT9455_CHARGE_ENABLE);
if (ret) {
dev_err(dev, "Failed to enable charging\n");
return;
}
queue_delayed_work(system_power_efficient_wq,
&info->max_charging_time_work,
RT9455_MAX_CHARGING_TIME * HZ);
break;
}
/*
* Notify userspace that the charger has been either connected to or
* disconnected from the power source.
*/
power_supply_changed(info->charger);
}
static void rt9455_max_charging_time_work_callback(struct work_struct *work)
{
struct rt9455_info *info = container_of(work, struct rt9455_info,
max_charging_time_work.work);
struct device *dev = &info->client->dev;
int ret;
dev_err(dev, "Battery has been charging for at least 6 hours and is not yet fully charged. Battery is dead, therefore charging is disabled.\n");
ret = regmap_field_write(info->regmap_fields[F_CHG_EN],
RT9455_CHARGE_DISABLE);
if (ret)
dev_err(dev, "Failed to disable charging\n");
}
static void rt9455_batt_presence_work_callback(struct work_struct *work)
{
struct rt9455_info *info = container_of(work, struct rt9455_info,
batt_presence_work.work);
struct device *dev = &info->client->dev;
unsigned int irq1, mask1;
int ret;
ret = regmap_read(info->regmap, RT9455_REG_IRQ1, &irq1);
if (ret) {
dev_err(dev, "Failed to read IRQ1 register\n");
return;
}
/*
* If the battery is still absent, batt_presence_work is rescheduled.
* Otherwise, max_charging_time is scheduled.
*/
if (irq1 & GET_MASK(F_BATAB)) {
queue_delayed_work(system_power_efficient_wq,
&info->batt_presence_work,
RT9455_BATT_PRESENCE_DELAY * HZ);
} else {
queue_delayed_work(system_power_efficient_wq,
&info->max_charging_time_work,
RT9455_MAX_CHARGING_TIME * HZ);
ret = regmap_read(info->regmap, RT9455_REG_MASK1, &mask1);
if (ret) {
dev_err(dev, "Failed to read MASK1 register\n");
return;
}
if (mask1 & GET_MASK(F_BATABM)) {
ret = regmap_field_write(info->regmap_fields[F_BATABM],
0x00);
if (ret)
dev_err(dev, "Failed to unmask BATAB interrupt\n");
}
/*
* Notify userspace that the battery is now connected to the
* charger.
*/
power_supply_changed(info->charger);
}
}
static const struct power_supply_desc rt9455_charger_desc = {
.name = RT9455_DRIVER_NAME,
.type = POWER_SUPPLY_TYPE_USB,
.properties = rt9455_charger_properties,
.num_properties = ARRAY_SIZE(rt9455_charger_properties),
.get_property = rt9455_charger_get_property,
};
static bool rt9455_is_writeable_reg(struct device *dev, unsigned int reg)
{
switch (reg) {
case RT9455_REG_DEV_ID:
case RT9455_REG_IRQ1:
case RT9455_REG_IRQ2:
case RT9455_REG_IRQ3:
return false;
default:
return true;
}
}
static bool rt9455_is_volatile_reg(struct device *dev, unsigned int reg)
{
switch (reg) {
case RT9455_REG_DEV_ID:
case RT9455_REG_CTRL5:
case RT9455_REG_CTRL6:
return false;
default:
return true;
}
}
static const struct regmap_config rt9455_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
.writeable_reg = rt9455_is_writeable_reg,
.volatile_reg = rt9455_is_volatile_reg,
.max_register = RT9455_REG_MASK3,
.cache_type = REGCACHE_RBTREE,
};
static int rt9455_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
struct device *dev = &client->dev;
struct rt9455_info *info;
struct power_supply_config rt9455_charger_config = {};
/*
* Mandatory device-specific data values. Also, VOREG and boost output
* voltage are mandatory values, but they are stored in rt9455_info
* structure.
*/
u32 ichrg, ieoc_percentage;
/* Optional device-specific data values. */
u32 mivr = -1, iaicr = -1;
int i, ret;
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
dev_err(dev, "No support for SMBUS_BYTE_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,
&rt9455_regmap_config);
if (IS_ERR(info->regmap)) {
dev_err(dev, "Failed to initialize register map\n");
return -EINVAL;
}
for (i = 0; i < F_MAX_FIELDS; i++) {
info->regmap_fields[i] =
devm_regmap_field_alloc(dev, info->regmap,
rt9455_reg_fields[i]);
if (IS_ERR(info->regmap_fields[i])) {
dev_err(dev,
"Failed to allocate regmap field = %d\n", i);
return PTR_ERR(info->regmap_fields[i]);
}
}
ret = rt9455_discover_charger(info, &ichrg, &ieoc_percentage,
&mivr, &iaicr);
if (ret) {
dev_err(dev, "Failed to discover charger\n");
return ret;
}
#if IS_ENABLED(CONFIG_USB_PHY)
info->usb_phy = devm_usb_get_phy(dev, USB_PHY_TYPE_USB2);
if (IS_ERR(info->usb_phy)) {
dev_err(dev, "Failed to get USB transceiver\n");
} else {
info->nb.notifier_call = rt9455_usb_event;
ret = usb_register_notifier(info->usb_phy, &info->nb);
if (ret) {
dev_err(dev, "Failed to register USB notifier\n");
/*
* If usb_register_notifier() fails, set notifier_call
* to NULL, to avoid calling usb_unregister_notifier().
*/
info->nb.notifier_call = NULL;
}
}
#endif
INIT_DEFERRABLE_WORK(&info->pwr_rdy_work, rt9455_pwr_rdy_work_callback);
INIT_DEFERRABLE_WORK(&info->max_charging_time_work,
rt9455_max_charging_time_work_callback);
INIT_DEFERRABLE_WORK(&info->batt_presence_work,
rt9455_batt_presence_work_callback);
rt9455_charger_config.of_node = dev->of_node;
rt9455_charger_config.drv_data = info;
rt9455_charger_config.supplied_to = rt9455_charger_supplied_to;
rt9455_charger_config.num_supplicants =
ARRAY_SIZE(rt9455_charger_supplied_to);
ret = devm_request_threaded_irq(dev, client->irq, NULL,
rt9455_irq_handler_thread,
IRQF_TRIGGER_LOW | IRQF_ONESHOT,
RT9455_DRIVER_NAME, info);
if (ret) {
dev_err(dev, "Failed to register IRQ handler\n");
goto put_usb_notifier;
}
ret = rt9455_hw_init(info, ichrg, ieoc_percentage, mivr, iaicr);
if (ret) {
dev_err(dev, "Failed to set charger to its default values\n");
goto put_usb_notifier;
}
info->charger = devm_power_supply_register(dev, &rt9455_charger_desc,
&rt9455_charger_config);
if (IS_ERR(info->charger)) {
dev_err(dev, "Failed to register charger\n");
ret = PTR_ERR(info->charger);
goto put_usb_notifier;
}
return 0;
put_usb_notifier:
#if IS_ENABLED(CONFIG_USB_PHY)
if (info->nb.notifier_call) {
usb_unregister_notifier(info->usb_phy, &info->nb);
info->nb.notifier_call = NULL;
}
#endif
return ret;
}
static int rt9455_remove(struct i2c_client *client)
{
int ret;
struct rt9455_info *info = i2c_get_clientdata(client);
ret = rt9455_register_reset(info);
if (ret)
dev_err(&info->client->dev, "Failed to set charger to its default values\n");
#if IS_ENABLED(CONFIG_USB_PHY)
if (info->nb.notifier_call)
usb_unregister_notifier(info->usb_phy, &info->nb);
#endif
cancel_delayed_work_sync(&info->pwr_rdy_work);
cancel_delayed_work_sync(&info->max_charging_time_work);
cancel_delayed_work_sync(&info->batt_presence_work);
return ret;
}
static const struct i2c_device_id rt9455_i2c_id_table[] = {
{ RT9455_DRIVER_NAME, 0 },
{ },
};
MODULE_DEVICE_TABLE(i2c, rt9455_i2c_id_table);
static const struct of_device_id rt9455_of_match[] = {
{ .compatible = "richtek,rt9455", },
{ },
};
MODULE_DEVICE_TABLE(of, rt9455_of_match);
static const struct acpi_device_id rt9455_i2c_acpi_match[] = {
{ "RT945500", 0 },
{ }
};
MODULE_DEVICE_TABLE(acpi, rt9455_i2c_acpi_match);
static struct i2c_driver rt9455_driver = {
.probe = rt9455_probe,
.remove = rt9455_remove,
.id_table = rt9455_i2c_id_table,
.driver = {
.name = RT9455_DRIVER_NAME,
.of_match_table = of_match_ptr(rt9455_of_match),
.acpi_match_table = ACPI_PTR(rt9455_i2c_acpi_match),
},
};
module_i2c_driver(rt9455_driver);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Anda-Maria Nicolae <anda-maria.nicolae@intel.com>");
MODULE_DESCRIPTION("Richtek RT9455 Charger Driver");
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