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Subject[PATCH 3/3] power_supply: Add support for Richtek RT9455 battery charger
Date
Based on the datasheet found here:
http://www.richtek.com/download_ds.jsp?p=RT9455

Signed-off-by: Anda-Maria Nicolae <anda-maria.nicolae@intel.com>
---
drivers/power/Kconfig | 7 +
drivers/power/Makefile | 1 +
drivers/power/rt9455_charger.c | 1751 ++++++++++++++++++++++++++++++++++++++++
3 files changed, 1759 insertions(+)
create mode 100644 drivers/power/rt9455_charger.c

diff --git a/drivers/power/Kconfig b/drivers/power/Kconfig
index a848b1a..08beeed 100644
--- a/drivers/power/Kconfig
+++ b/drivers/power/Kconfig
@@ -460,6 +460,13 @@ config BATTERY_RT5033
The fuelgauge calculates and determines the battery state of charge
according to battery open circuit voltage.

+config CHARGER_RT9455
+ tristate "Richtek RT9455 battery charger driver"
+ depends on I2C && GPIOLIB
+ select REGMAP_I2C
+ help
+ Say Y to enable support for Richtek RT9455 battery charger.
+
source "drivers/power/reset/Kconfig"

endif # POWER_SUPPLY
diff --git a/drivers/power/Makefile b/drivers/power/Makefile
index 3572a72..5752ce8 100644
--- a/drivers/power/Makefile
+++ b/drivers/power/Makefile
@@ -37,6 +37,7 @@ obj-$(CONFIG_BATTERY_MAX17040) += max17040_battery.o
obj-$(CONFIG_BATTERY_MAX17042) += max17042_battery.o
obj-$(CONFIG_BATTERY_Z2) += z2_battery.o
obj-$(CONFIG_BATTERY_RT5033) += rt5033_battery.o
+obj-$(CONFIG_CHARGER_RT9455) += rt9455_charger.o
obj-$(CONFIG_BATTERY_S3C_ADC) += s3c_adc_battery.o
obj-$(CONFIG_BATTERY_TWL4030_MADC) += twl4030_madc_battery.o
obj-$(CONFIG_CHARGER_88PM860X) += 88pm860x_charger.o
diff --git a/drivers/power/rt9455_charger.c b/drivers/power/rt9455_charger.c
new file mode 100644
index 0000000..7c0c1ff
--- /dev/null
+++ b/drivers/power/rt9455_charger.c
@@ -0,0 +1,1751 @@
+/*
+ * 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;
+}
+
+/*
+ * 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;
+}
+
+/*
+ * 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");
+ alert_userspace = true;
+ /*
+ * 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.
+ */
+ 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_charged() 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;
+}
+
+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;
+
+ if (!info)
+ return NOTIFY_DONE;
+
+ /*
+ * 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;
+}
+
+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;
+ }
+}
+
+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");
+ }
+ }
+}
+
+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");
--
1.7.9.5


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