[PATCH v5 2/3] power: supply: rt9471: Add Richtek RT9471 charger driver

From: cy_huang
Date: Wed Sep 14 2022 - 12:32:15 EST

From: ChiYuan Huang <cy_huang@xxxxxxxxxxx>

Add support for the RT9471 3A 1-Cell Li+ battery charger.

The RT9471 is a highly-integrated 3A switch mode battery charger with
low impedance power path to better optimize the charging efficiency.

Co-developed-by: Alina Yu <alina_yu@xxxxxxxxxxx>
Signed-off-by: Alina Yu <alina_yu@xxxxxxxxxxx>
Signed-off-by: ChiYuan Huang <cy_huang@xxxxxxxxxxx>
---
Since v5:
- Remove one line wrapper.
- Merge header content into source file, remove header file.
- Remove 'charge_term_enable' sysfs entry and merge it into
'charge_term_current' property control.
- Change MODULE_LICENSE from 'GPL v2' to 'GPL'.
Following by the below discussion
https://lore.kernel.org/all/YxAVAt2eWB3NFlrk@xxxxxxxxxx/

Since v4:
- Remove the line for the owner field in driver.

Since v2:
- Fix checkpatch error about 'foo * bar' to 'foo *bar' in psy_device_to_chip function.
- Specify the member name directly for the use of linear range.

---
drivers/power/supply/Kconfig | 16 +
drivers/power/supply/Makefile | 1 +
drivers/power/supply/rt9471.c | 937 ++++++++++++++++++++++++++++++++++++++++++
3 files changed, 954 insertions(+)
create mode 100644 drivers/power/supply/rt9471.c

diff --git a/drivers/power/supply/Kconfig b/drivers/power/supply/Kconfig
index 1aa8323..e9b61c2 100644
--- a/drivers/power/supply/Kconfig
+++ b/drivers/power/supply/Kconfig
@@ -772,6 +772,22 @@ config CHARGER_RT9455
help
Say Y to enable support for Richtek RT9455 battery charger.

+config CHARGER_RT9471
+ tristate "Richtek RT9471 battery charger driver"
+ depends on I2C && GPIOLIB && REGULATOR
+ select REGMAP_I2C
+ select REGMAP_IRQ
+ select LINEAR_RANGES
+ help
+ This adds support for Richtek RT9471 battery charger. RT9471 is
+ highly-integrated switch mode battery charger which is system power
+ patch manageable device for single cell Li-Ion and Li-polymer battery.
+ It can support BC12 detection on DPDM, and current and voltage
+ regulation on both charging and boost mode.
+
+ This driver can also be built as a module. If so, the module will be
+ called rt9471.
+
config CHARGER_CROS_USBPD
tristate "ChromeOS EC based USBPD charger"
depends on CROS_USBPD_NOTIFY
diff --git a/drivers/power/supply/Makefile b/drivers/power/supply/Makefile
index 7f02f36..17c8c1a 100644
--- a/drivers/power/supply/Makefile
+++ b/drivers/power/supply/Makefile
@@ -57,6 +57,7 @@ obj-$(CONFIG_BATTERY_MAX1721X) += max1721x_battery.o
obj-$(CONFIG_BATTERY_Z2) += z2_battery.o
obj-$(CONFIG_BATTERY_RT5033) += rt5033_battery.o
obj-$(CONFIG_CHARGER_RT9455) += rt9455_charger.o
+obj-$(CONFIG_CHARGER_RT9471) += rt9471.o
obj-$(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/supply/rt9471.c b/drivers/power/supply/rt9471.c
new file mode 100644
index 00000000..e5560a3
--- /dev/null
+++ b/drivers/power/supply/rt9471.c
@@ -0,0 +1,937 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2022 Richtek Technology Corp.
+ *
+ * Authors: Alina Yu <alina_yu@xxxxxxxxxxx>
+ * ChiYuan Huang <cy_huang@xxxxxxxxxxx>
+ */
+
+#include <linux/bits.h>
+#include <linux/gpio/consumer.h>
+#include <linux/i2c.h>
+#include <linux/interrupt.h>
+#include <linux/kstrtox.h>
+#include <linux/linear_range.h>
+#include <linux/mod_devicetable.h>
+#include <linux/mutex.h>
+#include <linux/of.h>
+#include <linux/power_supply.h>
+#include <linux/regmap.h>
+#include <linux/regulator/driver.h>
+#include <linux/sysfs.h>
+
+#define RT9471_REG_OTGCFG 0x00
+#define RT9471_REG_TOP 0x01
+#define RT9471_REG_FUNC 0x02
+#define RT9471_REG_IBUS 0x03
+#define RT9471_REG_VBUS 0x04
+#define RT9471_REG_PRECHG 0x05
+#define RT9471_REG_VCHG 0x07
+#define RT9471_REG_ICHG 0x08
+#define RT9471_REG_CHGTMR 0x09
+#define RT9471_REG_EOC 0x0A
+#define RT9471_REG_INFO 0x0B
+#define RT9471_REG_JEITA 0x0C
+#define RT9471_REG_PUMP_EXP 0x0D
+#define RT9471_REG_DPDMDET 0x0E
+#define RT9471_REG_ICSTAT 0x0F
+#define RT9471_REG_STAT0 0x10
+#define RT9471_REG_STAT1 0x11
+#define RT9471_REG_STAT2 0x12
+#define RT9471_REG_IRQ0 0x20
+#define RT9471_REG_MASK0 0x30
+
+#define RT9471_OTGCV_MASK GENMASK(7, 6)
+#define RT9471_OTGCC_MASK BIT(0)
+#define RT9471_OTGEN_MASK BIT(1)
+#define RT9471_CHGFAULT_MASK GENMASK(4, 1)
+
+#define RT9471_NUM_IRQ_REGS 4
+#define RT9471_OTGCV_MINUV 4850000
+#define RT9471_OTGCV_STEPUV 150000
+#define RT9471_NUM_VOTG 4
+#define RT9471_VCHG_MAXUV 4700000
+#define RT9471_ICHG_MAXUA 3150000
+
+/* Device ID */
+#define RT9470_DEVID 0x09
+#define RT9470D_DEVID 0x0A
+#define RT9471_DEVID 0x0D
+#define RT9471D_DEVID 0x0E
+
+/* IRQ number */
+#define RT9471_IRQ_BC12_DONE 0
+#define RT9471_IRQ_DETACH 1
+#define RT9471_IRQ_RECHG 2
+#define RT9471_IRQ_CHG_DONE 3
+#define RT9471_IRQ_BG_CHG 4
+#define RT9471_IRQ_IE0C 5
+#define RT9471_IRQ_CHG_RDY 6
+#define RT9471_IRQ_VBUS_GD 7
+#define RT9471_IRQ_CHG_BATOV 9
+#define RT9471_IRQ_CHG_SYSOV 10
+#define RT9471_IRQ_CHG_TOUT 11
+#define RT9471_IRQ_CHG_BUSUV 12
+#define RT9471_IRQ_CHG_THREG 13
+#define RT9471_IRQ_CHG_AICR 14
+#define RT9471_IRQ_CHG_MIVR 15
+#define RT9471_IRQ_SYS_SHORT 16
+#define RT9471_IRQ_SYS_MIN 17
+#define RT9471_IRQ_AICC_DONE 18
+#define RT9471_IRQ_PE_DONE 19
+#define RT9471_IRQ_JEITA_COLD 20
+#define RT9471_IRQ_JEITA_COOL 21
+#define RT9471_IRQ_JEITA_WARM 22
+#define RT9471_IRQ_JEITA_HOT 23
+#define RT9471_IRQ_OTG_FAULT 24
+#define RT9471_IRQ_OTG_LBP 25
+#define RT9471_IRQ_OTG_CC 26
+#define RT9471_IRQ_WDT 29
+#define RT9471_IRQ_VAC_OV 30
+#define RT9471_IRQ_OTP 31
+
+enum rt9471_fields {
+ F_WDT = 0,
+ F_WDT_RST,
+ F_CHG_EN,
+ F_HZ,
+ F_BATFET_DIS,
+ F_AICR,
+ F_AICC_EN,
+ F_MIVR,
+ F_IPRE_CHG,
+ F_VPRE_CHG,
+ F_VBAT_REG,
+ F_ICHG_REG,
+ F_EOC_RST,
+ F_TE,
+ F_IEOC_CHG,
+ F_DEVICE_ID,
+ F_REG_RST,
+ F_BC12_EN,
+ F_IC_STAT,
+ F_PORT_STAT,
+ F_ST_CHG_DONE,
+ F_ST_CHG_RDY,
+ F_ST_VBUS_GD,
+ F_MAX_FIELDS
+};
+
+enum rt9471_ranges {
+ RT9471_RANGE_AICR = 0,
+ RT9471_RANGE_MIVR,
+ RT9471_RANGE_IPRE,
+ RT9471_RANGE_VCHG,
+ RT9471_RANGE_ICHG,
+ RT9471_RANGE_IEOC,
+ RT9471_MAX_RANGES
+};
+
+enum {
+ RT9471_PORTSTAT_APPLE_10W = 8,
+ RT9471_PORTSTAT_SAMSUNG_10W,
+ RT9471_PORTSTAT_APPLE_5W,
+ RT9471_PORTSTAT_APPLE_12W,
+ RT9471_PORTSTAT_NSTD,
+ RT9471_PORTSTAT_SDP,
+ RT9471_PORTSTAT_CDP,
+ RT9471_PORTSTAT_DCP,
+};
+
+struct rt9471_chip {
+ struct device *dev;
+ struct gpio_desc *ce_gpio;
+ struct regmap *regmap;
+ struct regmap_field *rm_fields[F_MAX_FIELDS];
+ struct regmap_irq_chip_data *irq_chip_data;
+ struct regulator_dev *otg_rdev;
+ struct power_supply *psy;
+ struct power_supply_desc psy_desc;
+ struct mutex var_lock;
+ enum power_supply_usb_type psy_usb_type;
+ int psy_usb_curr;
+};
+
+static const struct reg_field rt9471_reg_fields[F_MAX_FIELDS] = {
+ [F_WDT] = REG_FIELD(RT9471_REG_TOP, 0, 0),
+ [F_WDT_RST] = REG_FIELD(RT9471_REG_TOP, 1, 1),
+ [F_CHG_EN] = REG_FIELD(RT9471_REG_FUNC, 0, 0),
+ [F_HZ] = REG_FIELD(RT9471_REG_FUNC, 5, 5),
+ [F_BATFET_DIS] = REG_FIELD(RT9471_REG_FUNC, 7, 7),
+ [F_AICR] = REG_FIELD(RT9471_REG_IBUS, 0, 5),
+ [F_AICC_EN] = REG_FIELD(RT9471_REG_IBUS, 7, 7),
+ [F_MIVR] = REG_FIELD(RT9471_REG_VBUS, 0, 3),
+ [F_IPRE_CHG] = REG_FIELD(RT9471_REG_PRECHG, 0, 3),
+ [F_VPRE_CHG] = REG_FIELD(RT9471_REG_PRECHG, 4, 6),
+ [F_VBAT_REG] = REG_FIELD(RT9471_REG_VCHG, 0, 6),
+ [F_ICHG_REG] = REG_FIELD(RT9471_REG_ICHG, 0, 5),
+ [F_EOC_RST] = REG_FIELD(RT9471_REG_EOC, 0, 0),
+ [F_TE] = REG_FIELD(RT9471_REG_EOC, 1, 1),
+ [F_IEOC_CHG] = REG_FIELD(RT9471_REG_EOC, 4, 7),
+ [F_DEVICE_ID] = REG_FIELD(RT9471_REG_INFO, 3, 6),
+ [F_REG_RST] = REG_FIELD(RT9471_REG_INFO, 7, 7),
+ [F_BC12_EN] = REG_FIELD(RT9471_REG_DPDMDET, 7, 7),
+ [F_IC_STAT] = REG_FIELD(RT9471_REG_ICSTAT, 0, 3),
+ [F_PORT_STAT] = REG_FIELD(RT9471_REG_ICSTAT, 4, 7),
+ [F_ST_CHG_DONE] = REG_FIELD(RT9471_REG_STAT0, 3, 3),
+ [F_ST_CHG_RDY] = REG_FIELD(RT9471_REG_STAT0, 6, 6),
+ [F_ST_VBUS_GD] = REG_FIELD(RT9471_REG_STAT0, 7, 7),
+};
+
+static const struct linear_range rt9471_chg_ranges[RT9471_MAX_RANGES] = {
+ [RT9471_RANGE_AICR] = { .min = 50000, .min_sel = 1, .max_sel = 63, .step = 50000 },
+ [RT9471_RANGE_MIVR] = { .min = 3900000, .min_sel = 0, .max_sel = 15, .step = 100000 },
+ [RT9471_RANGE_IPRE] = { .min = 50000, .min_sel = 0, .max_sel = 15, .step = 50000 },
+ [RT9471_RANGE_VCHG] = { .min = 3900000, .min_sel = 0, .max_sel = 80, .step = 10000 },
+ [RT9471_RANGE_ICHG] = { .min = 0, .min_sel = 0, .max_sel = 63, .step = 50000 },
+ [RT9471_RANGE_IEOC] = { .min = 50000, .min_sel = 0, .max_sel = 15, .step = 50000 },
+};
+
+static int rt9471_set_value_by_field_range(struct rt9471_chip *chip,
+ enum rt9471_fields field,
+ enum rt9471_ranges range, int val)
+{
+ unsigned int sel;
+
+ if (val < 0)
+ return -EINVAL;
+
+ linear_range_get_selector_within(rt9471_chg_ranges + range, val, &sel);
+
+ return regmap_field_write(chip->rm_fields[field], sel);
+}
+
+
+static int rt9471_get_value_by_field_range(struct rt9471_chip *chip,
+ enum rt9471_fields field,
+ enum rt9471_ranges range, int *val)
+{
+ unsigned int sel, rvalue;
+ int ret;
+
+ ret = regmap_field_read(chip->rm_fields[field], &sel);
+ if (ret)
+ return ret;
+
+ ret = linear_range_get_value(rt9471_chg_ranges + range, sel, &rvalue);
+ if (ret)
+ return ret;
+
+ *val = rvalue;
+ return 0;
+}
+
+static int rt9471_set_ieoc(struct rt9471_chip *chip, int microamp)
+{
+ int ret;
+
+ if (microamp == 0)
+ return regmap_field_write(chip->rm_fields[F_TE], 0);
+
+ ret = rt9471_set_value_by_field_range(chip, F_IEOC_CHG, RT9471_RANGE_IEOC, microamp);
+ if (ret)
+ return ret;
+
+ /* After applying the new IEOC value, enable charge termination */
+ return regmap_field_write(chip->rm_fields[F_TE], 1);
+}
+
+static int rt9471_get_ieoc(struct rt9471_chip *chip, int *microamp)
+{
+ unsigned int chg_term_enable;
+ int ret;
+
+ ret = regmap_field_read(chip->rm_fields[F_TE], &chg_term_enable);
+ if (ret)
+ return ret;
+
+ if (!chg_term_enable) {
+ *microamp = 0;
+ return 0;
+ }
+
+ return rt9471_get_value_by_field_range(chip, F_IEOC_CHG, RT9471_RANGE_IEOC, microamp);
+}
+
+static int rt9471_get_status(struct rt9471_chip *chip, int *status)
+{
+ unsigned int chg_ready, chg_done, fault_stat;
+ int ret;
+
+ ret = regmap_field_read(chip->rm_fields[F_ST_CHG_RDY], &chg_ready);
+ if (ret)
+ return ret;
+
+ ret = regmap_field_read(chip->rm_fields[F_ST_CHG_DONE], &chg_done);
+ if (ret)
+ return ret;
+
+ ret = regmap_read(chip->regmap, RT9471_REG_STAT1, &fault_stat);
+ if (ret)
+ return ret;
+
+ fault_stat &= RT9471_CHGFAULT_MASK;
+
+ if (chg_ready && chg_done)
+ *status = POWER_SUPPLY_STATUS_FULL;
+ else if (chg_ready && fault_stat)
+ *status = POWER_SUPPLY_STATUS_NOT_CHARGING;
+ else if (chg_ready && !fault_stat)
+ *status = POWER_SUPPLY_STATUS_CHARGING;
+ else
+ *status = POWER_SUPPLY_STATUS_DISCHARGING;
+
+ return 0;
+}
+
+static int rt9471_get_vbus_good(struct rt9471_chip *chip, int *stat)
+{
+ unsigned int vbus_gd;
+ int ret;
+
+ ret = regmap_field_read(chip->rm_fields[F_ST_VBUS_GD], &vbus_gd);
+ if (ret)
+ return ret;
+
+ *stat = vbus_gd;
+ return 0;
+}
+
+static int rt9471_get_usb_type(struct rt9471_chip *chip, int *usb_type)
+{
+ mutex_lock(&chip->var_lock);
+ *usb_type = chip->psy_usb_type;
+ mutex_unlock(&chip->var_lock);
+
+ return 0;
+}
+
+static int rt9471_get_usb_type_current(struct rt9471_chip *chip,
+ int *microamp)
+{
+ mutex_lock(&chip->var_lock);
+ *microamp = chip->psy_usb_curr;
+ mutex_unlock(&chip->var_lock);
+
+ return 0;
+}
+
+static enum power_supply_property rt9471_charger_properties[] = {
+ POWER_SUPPLY_PROP_STATUS,
+ POWER_SUPPLY_PROP_ONLINE,
+ POWER_SUPPLY_PROP_CURRENT_MAX,
+ POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT,
+ POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX,
+ POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE,
+ POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX,
+ POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT,
+ POWER_SUPPLY_PROP_INPUT_VOLTAGE_LIMIT,
+ POWER_SUPPLY_PROP_USB_TYPE,
+ POWER_SUPPLY_PROP_PRECHARGE_CURRENT,
+ POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT,
+ POWER_SUPPLY_PROP_MODEL_NAME,
+ POWER_SUPPLY_PROP_MANUFACTURER,
+};
+
+static enum power_supply_usb_type rt9471_charger_usb_types[] = {
+ POWER_SUPPLY_USB_TYPE_UNKNOWN,
+ POWER_SUPPLY_USB_TYPE_SDP,
+ POWER_SUPPLY_USB_TYPE_DCP,
+ POWER_SUPPLY_USB_TYPE_CDP,
+ POWER_SUPPLY_USB_TYPE_APPLE_BRICK_ID,
+};
+
+static int rt9471_charger_property_is_writeable(struct power_supply *psy,
+ enum power_supply_property psp)
+{
+ switch (psp) {
+ case POWER_SUPPLY_PROP_STATUS:
+ case POWER_SUPPLY_PROP_ONLINE:
+ case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
+ case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
+ case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
+ case POWER_SUPPLY_PROP_INPUT_VOLTAGE_LIMIT:
+ case POWER_SUPPLY_PROP_PRECHARGE_CURRENT:
+ case POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT:
+ return 1;
+ default:
+ return 0;
+ }
+}
+
+static int rt9471_charger_set_property(struct power_supply *psy,
+ enum power_supply_property psp,
+ const union power_supply_propval *val)
+{
+ struct rt9471_chip *chip = power_supply_get_drvdata(psy);
+ int value = val->intval;
+
+ switch (psp) {
+ case POWER_SUPPLY_PROP_STATUS:
+ return regmap_field_write(chip->rm_fields[F_CHG_EN], !!value);
+ case POWER_SUPPLY_PROP_ONLINE:
+ return regmap_field_write(chip->rm_fields[F_HZ], !value);
+ case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
+ return rt9471_set_value_by_field_range(chip, F_ICHG_REG, RT9471_RANGE_ICHG, value);
+ case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
+ return rt9471_set_value_by_field_range(chip, F_VBAT_REG, RT9471_RANGE_VCHG, value);
+ case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
+ return rt9471_set_value_by_field_range(chip, F_AICR, RT9471_RANGE_AICR, value);
+ case POWER_SUPPLY_PROP_INPUT_VOLTAGE_LIMIT:
+ return rt9471_set_value_by_field_range(chip, F_MIVR, RT9471_RANGE_MIVR, value);
+ case POWER_SUPPLY_PROP_PRECHARGE_CURRENT:
+ return rt9471_set_value_by_field_range(chip, F_IPRE_CHG, RT9471_RANGE_IPRE, value);
+ case POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT:
+ return rt9471_set_ieoc(chip, val->intval);
+ default:
+ return -EINVAL;
+ }
+}
+
+static const char * const rt9471_manufacturer = "Richtek Technology Corp.";
+static const char * const rt9471_model = "RT9471";
+
+static int rt9471_charger_get_property(struct power_supply *psy,
+ enum power_supply_property psp,
+ union power_supply_propval *val)
+{
+ struct rt9471_chip *chip = power_supply_get_drvdata(psy);
+ int *pvalue = &val->intval;
+
+ switch (psp) {
+ case POWER_SUPPLY_PROP_STATUS:
+ return rt9471_get_status(chip, pvalue);
+ case POWER_SUPPLY_PROP_ONLINE:
+ return rt9471_get_vbus_good(chip, pvalue);
+ case POWER_SUPPLY_PROP_CURRENT_MAX:
+ return rt9471_get_usb_type_current(chip, pvalue);
+ case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
+ return rt9471_get_value_by_field_range(chip, F_ICHG_REG, RT9471_RANGE_ICHG, pvalue);
+ case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX:
+ *pvalue = RT9471_ICHG_MAXUA;
+ return 0;
+ case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
+ return rt9471_get_value_by_field_range(chip, F_VBAT_REG, RT9471_RANGE_VCHG, pvalue);
+ case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX:
+ val->intval = RT9471_VCHG_MAXUV;
+ return 0;
+ case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
+ return rt9471_get_value_by_field_range(chip, F_AICR, RT9471_RANGE_AICR, pvalue);
+ case POWER_SUPPLY_PROP_INPUT_VOLTAGE_LIMIT:
+ return rt9471_get_value_by_field_range(chip, F_MIVR, RT9471_RANGE_MIVR, pvalue);
+ case POWER_SUPPLY_PROP_USB_TYPE:
+ return rt9471_get_usb_type(chip, pvalue);
+ case POWER_SUPPLY_PROP_PRECHARGE_CURRENT:
+ return rt9471_get_value_by_field_range(chip, F_IPRE_CHG, RT9471_RANGE_IPRE, pvalue);
+ case POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT:
+ return rt9471_get_ieoc(chip, pvalue);
+ case POWER_SUPPLY_PROP_MODEL_NAME:
+ val->strval = rt9471_model;
+ return 0;
+ case POWER_SUPPLY_PROP_MANUFACTURER:
+ val->strval = rt9471_manufacturer;
+ return 0;
+ default:
+ return -ENODATA;
+ }
+}
+
+static irqreturn_t rt9471_vbus_gd_handler(int irqno, void *devid)
+{
+ struct rt9471_chip *chip = devid;
+
+ power_supply_changed(chip->psy);
+
+ return IRQ_HANDLED;
+}
+
+static irqreturn_t rt9471_detach_handler(int irqno, void *devid)
+{
+ struct rt9471_chip *chip = devid;
+ unsigned int vbus_gd;
+ int ret;
+
+ ret = regmap_field_read(chip->rm_fields[F_ST_VBUS_GD], &vbus_gd);
+ if (ret)
+ return IRQ_NONE;
+
+ /* Only focus on really detached */
+ if (vbus_gd)
+ return IRQ_HANDLED;
+
+ mutex_lock(&chip->var_lock);
+ chip->psy_usb_type = POWER_SUPPLY_USB_TYPE_UNKNOWN;
+ chip->psy_usb_curr = 0;
+ mutex_unlock(&chip->var_lock);
+
+ power_supply_changed(chip->psy);
+
+ return IRQ_HANDLED;
+}
+
+static irqreturn_t rt9471_bc12_done_handler(int irqno, void *devid)
+{
+ struct rt9471_chip *chip = devid;
+ enum power_supply_usb_type usb_type;
+ unsigned int port_stat;
+ int usb_curr, ret;
+
+ ret = regmap_field_read(chip->rm_fields[F_PORT_STAT], &port_stat);
+ if (ret)
+ return IRQ_NONE;
+
+ switch (port_stat) {
+ case RT9471_PORTSTAT_APPLE_10W:
+ usb_type = POWER_SUPPLY_USB_TYPE_APPLE_BRICK_ID;
+ usb_curr = 2000000;
+ break;
+ case RT9471_PORTSTAT_APPLE_5W:
+ usb_type = POWER_SUPPLY_USB_TYPE_APPLE_BRICK_ID;
+ usb_curr = 1000000;
+ break;
+ case RT9471_PORTSTAT_APPLE_12W:
+ usb_type = POWER_SUPPLY_USB_TYPE_APPLE_BRICK_ID;
+ usb_curr = 2400000;
+ break;
+ case RT9471_PORTSTAT_SAMSUNG_10W:
+ usb_type = POWER_SUPPLY_USB_TYPE_DCP;
+ usb_curr = 2000000;
+ break;
+ case RT9471_PORTSTAT_DCP:
+ usb_type = POWER_SUPPLY_USB_TYPE_DCP;
+ usb_curr = 1500000;
+ break;
+ case RT9471_PORTSTAT_NSTD:
+ case RT9471_PORTSTAT_SDP:
+ usb_type = POWER_SUPPLY_USB_TYPE_SDP;
+ usb_curr = 500000;
+ break;
+ case RT9471_PORTSTAT_CDP:
+ usb_type = POWER_SUPPLY_USB_TYPE_CDP;
+ usb_curr = 1500000;
+ break;
+ default:
+ usb_type = POWER_SUPPLY_USB_TYPE_UNKNOWN;
+ usb_curr = 0;
+ break;
+ }
+
+ mutex_lock(&chip->var_lock);
+ chip->psy_usb_type = usb_type;
+ chip->psy_usb_curr = usb_curr;
+ mutex_unlock(&chip->var_lock);
+
+ power_supply_changed(chip->psy);
+
+ return IRQ_HANDLED;
+}
+
+static irqreturn_t rt9471_wdt_handler(int irqno, void *devid)
+{
+ struct rt9471_chip *chip = devid;
+ int ret;
+
+ ret = regmap_field_write(chip->rm_fields[F_WDT_RST], 1);
+
+ return ret ? IRQ_NONE : IRQ_HANDLED;
+}
+
+static irqreturn_t rt9471_otg_fault_handler(int irqno, void *devid)
+{
+ struct rt9471_chip *chip = devid;
+
+ regulator_notifier_call_chain(chip->otg_rdev, REGULATOR_EVENT_FAIL, NULL);
+
+ return IRQ_HANDLED;
+}
+
+#define RT9471_IRQ_DESC(_name, _hwirq) \
+{ \
+ .name = #_name, \
+ .hwirq = _hwirq, \
+ .handler = rt9471_##_name##_handler, \
+}
+
+static int rt9471_register_interrupts(struct rt9471_chip *chip)
+{
+ struct device *dev = chip->dev;
+ static const struct {
+ char *name;
+ int hwirq;
+ irq_handler_t handler;
+ } chg_irqs[] = {
+ RT9471_IRQ_DESC(vbus_gd, RT9471_IRQ_VBUS_GD),
+ RT9471_IRQ_DESC(detach, RT9471_IRQ_DETACH),
+ RT9471_IRQ_DESC(bc12_done, RT9471_IRQ_BC12_DONE),
+ RT9471_IRQ_DESC(wdt, RT9471_IRQ_WDT),
+ RT9471_IRQ_DESC(otg_fault, RT9471_IRQ_OTG_FAULT),
+ }, *curr;
+ int i, virq, ret;
+
+ for (i = 0; i < ARRAY_SIZE(chg_irqs); i++) {
+ curr = chg_irqs + i;
+
+ virq = regmap_irq_get_virq(chip->irq_chip_data, curr->hwirq);
+ if (virq <= 0)
+ return virq;
+
+ ret = devm_request_threaded_irq(dev, virq, NULL, curr->handler,
+ IRQF_ONESHOT, curr->name, chip);
+ if (ret)
+ return dev_err_probe(dev, ret, "Failed to register IRQ (%s)\n",
+ curr->name);
+ }
+
+ return 0;
+}
+
+static const struct regulator_ops rt9471_otg_ops = {
+ .enable = regulator_enable_regmap,
+ .disable = regulator_disable_regmap,
+ .is_enabled = regulator_is_enabled_regmap,
+ .list_voltage = regulator_list_voltage_linear,
+ .get_voltage_sel = regulator_get_voltage_sel_regmap,
+ .set_voltage_sel = regulator_set_voltage_sel_regmap,
+ .set_current_limit = regulator_set_current_limit_regmap,
+ .get_current_limit = regulator_get_current_limit_regmap,
+};
+
+static const unsigned int rt9471_otg_microamp[] = { 500000, 1200000, };
+
+static const struct regulator_desc rt9471_otg_rdesc = {
+ .of_match = of_match_ptr("usb-otg-vbus-regulator"),
+ .name = "rt9471-otg-vbus",
+ .owner = THIS_MODULE,
+ .type = REGULATOR_VOLTAGE,
+ .ops = &rt9471_otg_ops,
+ .min_uV = RT9471_OTGCV_MINUV,
+ .uV_step = RT9471_OTGCV_STEPUV,
+ .n_voltages = RT9471_NUM_VOTG,
+ .curr_table = rt9471_otg_microamp,
+ .n_current_limits = ARRAY_SIZE(rt9471_otg_microamp),
+ .enable_mask = RT9471_OTGEN_MASK,
+ .enable_reg = RT9471_REG_FUNC,
+ .vsel_reg = RT9471_REG_OTGCFG,
+ .vsel_mask = RT9471_OTGCV_MASK,
+ .csel_reg = RT9471_REG_OTGCFG,
+ .csel_mask = RT9471_OTGCC_MASK,
+};
+
+static int rt9471_register_otg_regulator(struct rt9471_chip *chip)
+{
+ struct device *dev = chip->dev;
+ struct regulator_config cfg = { .dev = dev, .driver_data = chip };
+
+ chip->otg_rdev = devm_regulator_register(dev, &rt9471_otg_rdesc, &cfg);
+
+ return PTR_ERR_OR_ZERO(chip->otg_rdev);
+}
+
+static inline struct rt9471_chip *psy_device_to_chip(struct device *dev)
+{
+ return power_supply_get_drvdata(to_power_supply(dev));
+}
+
+static ssize_t sysoff_enable_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct rt9471_chip *chip = psy_device_to_chip(dev);
+ unsigned int sysoff_enable;
+ int ret;
+
+ ret = regmap_field_read(chip->rm_fields[F_BATFET_DIS], &sysoff_enable);
+ if (ret)
+ return ret;
+
+ return sysfs_emit(buf, "%d\n", sysoff_enable);
+}
+
+static ssize_t sysoff_enable_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct rt9471_chip *chip = psy_device_to_chip(dev);
+ unsigned int tmp;
+ int ret;
+
+ ret = kstrtouint(buf, 10, &tmp);
+ if (ret)
+ return ret;
+
+ ret = regmap_field_write(chip->rm_fields[F_BATFET_DIS], !!tmp);
+ if (ret)
+ return ret;
+
+ return count;
+}
+
+static ssize_t port_detect_enable_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct rt9471_chip *chip = psy_device_to_chip(dev);
+ unsigned int bc12_enable;
+ int ret;
+
+ ret = regmap_field_read(chip->rm_fields[F_BC12_EN], &bc12_enable);
+ if (ret)
+ return ret;
+
+ return sysfs_emit(buf, "%d\n", bc12_enable);
+}
+
+static ssize_t port_detect_enable_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct rt9471_chip *chip = psy_device_to_chip(dev);
+ unsigned int tmp;
+ int ret;
+
+ ret = kstrtouint(buf, 10, &tmp);
+ if (ret)
+ return ret;
+
+ ret = regmap_field_write(chip->rm_fields[F_BC12_EN], !!tmp);
+ if (ret)
+ return ret;
+
+ return count;
+}
+
+static DEVICE_ATTR_RW(sysoff_enable);
+static DEVICE_ATTR_RW(port_detect_enable);
+
+static struct attribute *rt9471_sysfs_entries[] = {
+ &dev_attr_sysoff_enable.attr,
+ &dev_attr_port_detect_enable.attr,
+ NULL
+};
+
+static const struct attribute_group rt9471_attr_group = {
+ .attrs = rt9471_sysfs_entries,
+};
+
+static const struct attribute_group *rt9471_attr_groups[] = {
+ &rt9471_attr_group,
+ NULL
+};
+
+static int rt9471_register_psy(struct rt9471_chip *chip)
+{
+ struct device *dev = chip->dev;
+ struct power_supply_desc *desc = &chip->psy_desc;
+ struct power_supply_config cfg = {};
+ char *psy_name;
+
+ cfg.drv_data = chip;
+ cfg.of_node = dev->of_node;
+ cfg.attr_grp = rt9471_attr_groups;
+
+ psy_name = devm_kasprintf(dev, GFP_KERNEL, "rt9471-%s", dev_name(dev));
+ if (!psy_name)
+ return -ENOMEM;
+
+ desc->name = psy_name;
+ desc->type = POWER_SUPPLY_TYPE_USB;
+ desc->usb_types = rt9471_charger_usb_types;
+ desc->num_usb_types = ARRAY_SIZE(rt9471_charger_usb_types);
+ desc->properties = rt9471_charger_properties;
+ desc->num_properties = ARRAY_SIZE(rt9471_charger_properties);
+ desc->get_property = rt9471_charger_get_property;
+ desc->set_property = rt9471_charger_set_property;
+ desc->property_is_writeable = rt9471_charger_property_is_writeable;
+
+ chip->psy = devm_power_supply_register(dev, desc, &cfg);
+
+ return PTR_ERR_OR_ZERO(chip->psy);
+}
+
+static const struct regmap_irq rt9471_regmap_irqs[] = {
+ REGMAP_IRQ_REG_LINE(RT9471_IRQ_BC12_DONE, 8),
+ REGMAP_IRQ_REG_LINE(RT9471_IRQ_DETACH, 8),
+ REGMAP_IRQ_REG_LINE(RT9471_IRQ_RECHG, 8),
+ REGMAP_IRQ_REG_LINE(RT9471_IRQ_CHG_DONE, 8),
+ REGMAP_IRQ_REG_LINE(RT9471_IRQ_BG_CHG, 8),
+ REGMAP_IRQ_REG_LINE(RT9471_IRQ_IE0C, 8),
+ REGMAP_IRQ_REG_LINE(RT9471_IRQ_CHG_RDY, 8),
+ REGMAP_IRQ_REG_LINE(RT9471_IRQ_VBUS_GD, 8),
+ REGMAP_IRQ_REG_LINE(RT9471_IRQ_CHG_BATOV, 8),
+ REGMAP_IRQ_REG_LINE(RT9471_IRQ_CHG_SYSOV, 8),
+ REGMAP_IRQ_REG_LINE(RT9471_IRQ_CHG_TOUT, 8),
+ REGMAP_IRQ_REG_LINE(RT9471_IRQ_CHG_BUSUV, 8),
+ REGMAP_IRQ_REG_LINE(RT9471_IRQ_CHG_THREG, 8),
+ REGMAP_IRQ_REG_LINE(RT9471_IRQ_CHG_AICR, 8),
+ REGMAP_IRQ_REG_LINE(RT9471_IRQ_CHG_MIVR, 8),
+ REGMAP_IRQ_REG_LINE(RT9471_IRQ_SYS_SHORT, 8),
+ REGMAP_IRQ_REG_LINE(RT9471_IRQ_SYS_MIN, 8),
+ REGMAP_IRQ_REG_LINE(RT9471_IRQ_AICC_DONE, 8),
+ REGMAP_IRQ_REG_LINE(RT9471_IRQ_PE_DONE, 8),
+ REGMAP_IRQ_REG_LINE(RT9471_IRQ_JEITA_COLD, 8),
+ REGMAP_IRQ_REG_LINE(RT9471_IRQ_JEITA_COOL, 8),
+ REGMAP_IRQ_REG_LINE(RT9471_IRQ_JEITA_WARM, 8),
+ REGMAP_IRQ_REG_LINE(RT9471_IRQ_JEITA_HOT, 8),
+ REGMAP_IRQ_REG_LINE(RT9471_IRQ_OTG_FAULT, 8),
+ REGMAP_IRQ_REG_LINE(RT9471_IRQ_OTG_LBP, 8),
+ REGMAP_IRQ_REG_LINE(RT9471_IRQ_OTG_CC, 8),
+ REGMAP_IRQ_REG_LINE(RT9471_IRQ_WDT, 8),
+ REGMAP_IRQ_REG_LINE(RT9471_IRQ_VAC_OV, 8),
+ REGMAP_IRQ_REG_LINE(RT9471_IRQ_OTP, 8),
+};
+
+static const struct regmap_irq_chip rt9471_irq_chip = {
+ .name = "rt9471-irqs",
+ .status_base = RT9471_REG_IRQ0,
+ .mask_base = RT9471_REG_MASK0,
+ .num_regs = RT9471_NUM_IRQ_REGS,
+ .irqs = rt9471_regmap_irqs,
+ .num_irqs = ARRAY_SIZE(rt9471_regmap_irqs),
+};
+
+static const struct reg_sequence rt9471_init_regs[] = {
+ REG_SEQ0(RT9471_REG_INFO, 0x80), /* REG_RST */
+ REG_SEQ0(RT9471_REG_TOP, 0xC0), /* WDT = 0 */
+ REG_SEQ0(RT9471_REG_FUNC, 0x01), /* BATFET_DIS_DLY = 0 */
+ REG_SEQ0(RT9471_REG_IBUS, 0x0A), /* AUTO_AICR = 0 */
+ REG_SEQ0(RT9471_REG_VBUS, 0xC6), /* VAC_OVP = 14V */
+ REG_SEQ0(RT9471_REG_JEITA, 0x38), /* JEITA = 0 */
+ REG_SEQ0(RT9471_REG_DPDMDET, 0x31), /* BC12_EN = 0, DCP_DP_OPT = 1 */
+};
+
+static int rt9471_check_devinfo(struct rt9471_chip *chip)
+{
+ struct device *dev = chip->dev;
+ unsigned int dev_id;
+ int ret;
+
+ ret = regmap_field_read(chip->rm_fields[F_DEVICE_ID], &dev_id);
+ if (ret)
+ return dev_err_probe(dev, ret, "Failed to read device_id\n");
+
+ switch (dev_id) {
+ case RT9470_DEVID:
+ case RT9470D_DEVID:
+ case RT9471_DEVID:
+ case RT9471D_DEVID:
+ return 0;
+ default:
+ return dev_err_probe(dev, -ENODEV, "Incorrect device id\n");
+ }
+}
+
+static bool rt9471_accessible_reg(struct device *dev, unsigned int reg)
+{
+ switch (reg) {
+ case 0x00 ... 0x0F:
+ case 0x10 ... 0x13:
+ case 0x20 ... 0x33:
+ case 0x40 ... 0xA1:
+ return true;
+ default:
+ return false;
+ }
+}
+
+static const struct regmap_config rt9471_regmap_config = {
+ .reg_bits = 8,
+ .val_bits = 8,
+ .max_register = 0xA1,
+ .writeable_reg = rt9471_accessible_reg,
+ .readable_reg = rt9471_accessible_reg,
+};
+
+static int rt9471_probe(struct i2c_client *i2c)
+{
+ struct device *dev = &i2c->dev;
+ struct rt9471_chip *chip;
+ struct gpio_desc *ce_gpio;
+ struct regmap *regmap;
+ int ret;
+
+ chip = devm_kzalloc(dev, sizeof(*chip), GFP_KERNEL);
+ if (!chip)
+ return -ENOMEM;
+
+ chip->dev = dev;
+ mutex_init(&chip->var_lock);
+ i2c_set_clientdata(i2c, chip);
+
+ /* Default pull charge enable gpio to make 'CHG_EN' by SW control only */
+ ce_gpio = devm_gpiod_get_optional(dev, "charge-enable", GPIOD_OUT_HIGH);
+ if (IS_ERR(chip->ce_gpio))
+ return dev_err_probe(dev, PTR_ERR(ce_gpio),
+ "Failed to config charge enable gpio\n");
+
+ regmap = devm_regmap_init_i2c(i2c, &rt9471_regmap_config);
+ if (IS_ERR(regmap))
+ return dev_err_probe(dev, PTR_ERR(regmap), "Failed to init regmap\n");
+
+ chip->regmap = regmap;
+
+ ret = devm_regmap_field_bulk_alloc(dev, regmap, chip->rm_fields,
+ rt9471_reg_fields,
+ ARRAY_SIZE(rt9471_reg_fields));
+ if (ret)
+ return dev_err_probe(dev, ret, "Failed to alloc regmap field\n");
+
+ ret = rt9471_check_devinfo(chip);
+ if (ret)
+ return ret;
+
+ ret = regmap_register_patch(regmap, rt9471_init_regs,
+ ARRAY_SIZE(rt9471_init_regs));
+ if (ret)
+ return dev_err_probe(dev, ret, "Failed to init registers\n");
+
+ ret = devm_regmap_add_irq_chip(dev, regmap, i2c->irq,
+ IRQF_TRIGGER_FALLING | IRQF_ONESHOT, 0,
+ &rt9471_irq_chip, &chip->irq_chip_data);
+ if (ret)
+ return dev_err_probe(dev, ret, "Failed to add IRQ chip\n");
+
+ ret = rt9471_register_psy(chip);
+ if (ret)
+ return dev_err_probe(dev, ret, "Failed to register psy\n");
+
+ ret = rt9471_register_otg_regulator(chip);
+ if (ret)
+ return dev_err_probe(dev, ret, "Failed to register otg\n");
+
+ ret = rt9471_register_interrupts(chip);
+ if (ret)
+ return ret;
+
+ /* After IRQs are all initialized, enable port detection by default */
+ return regmap_field_write(chip->rm_fields[F_BC12_EN], 1);
+}
+
+static void rt9471_shutdown(struct i2c_client *i2c)
+{
+ struct rt9471_chip *chip = i2c_get_clientdata(i2c);
+
+ /*
+ * There's no external reset pin. Do register reset to guarantee charger
+ * function is normal after shutdown
+ */
+ regmap_field_write(chip->rm_fields[F_REG_RST], 1);
+}
+
+static const struct of_device_id rt9471_of_device_id[] = {
+ { .compatible = "richtek,rt9471" },
+ {}
+};
+MODULE_DEVICE_TABLE(of, rt9471_of_device_id);
+
+static struct i2c_driver rt9471_driver = {
+ .driver = {
+ .name = "rt9471",
+ .of_match_table = rt9471_of_device_id,
+ },
+ .probe_new = rt9471_probe,
+ .shutdown = rt9471_shutdown,
+};
+module_i2c_driver(rt9471_driver);
+
+MODULE_DESCRIPTION("Richtek RT9471 charger driver");
+MODULE_AUTHOR("Alina Yu <alina_yu@xxxxxxxxxxx>");
+MODULE_AUTHOR("ChiYuan Huang <cy_huang@xxxxxxxxxxx>");
+MODULE_LICENSE("GPL");
--
2.7.4