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kernel-fxtec-pro1x/drivers/power/rt9455_charger.c
Anda-Maria Nicolae f5bbc91c88 power_supply: rt9455_charger: Properly notify userspace about charging events 
Charging events this patch refers to are:
- charger is connected to/disconnected from the power source
- battery is reconnected to the charger, after it was absent.

When the charger is connected to/disconnected from the power source, CHRVPI
interrupt occurs and PWR_RDY bit is either set or cleared. PWR_RDY bit is
updated after 1-2 seconds CHRVPI interrupt has occurred.
power_supply_changed() should be called after PWR_RDY bit is updated.
/sys/class/power_supply/rt9455-charger/online file displays the value of
PWR_RDY bit.
This way, if the userspace is notified that a charging event has occurred
and the userspace reads /sys/class/power_supply/rt9455-charger/online file,
this file is properly updated when the userspace reads it.
This is the reason why power_supply_changed() is called in
rt9455_pwr_rdy_work_callback(), instead of being called in interrupt
handler.

Since no interrupt is triggered when the battery is reconnected to the
charger, the userspace is never notified that the battery is reconnected.
This is why power_supply_changed() is called in
rt9455_max_charging_time_work_callback(), so that the userspace is notified
that the battery is reconnected.

Signed-off-by: Anda-Maria Nicolae <anda-maria.nicolae@intel.com>
Reviewed-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Signed-off-by: Sebastian Reichel <sre@kernel.org>
2015-07-09 04:04:56 +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_ALIAS("i2c:rt9455-charger");
MODULE_DESCRIPTION("Richtek RT9455 Charger Driver");
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