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([188.163.112.51]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-ac3146aef69sm1115638466b.4.2025.03.20.00.30.21 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 20 Mar 2025 00:30:22 -0700 (PDT) From: Svyatoslav Ryhel To: Sebastian Reichel , Krzysztof Kozlowski , Conor Dooley , Svyatoslav Ryhel Cc: linux-pm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v5 2/2] power: supply: Add support for Maxim MAX8971 charger Date: Thu, 20 Mar 2025 09:29:47 +0200 Message-ID: <20250320072947.8174-3-clamor95@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250320072947.8174-1-clamor95@gmail.com> References: <20250320072947.8174-1-clamor95@gmail.com> Precedence: bulk X-Mailing-List: linux-pm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 The MAX8971 is a compact, high-frequency, high-efficiency switch-mode charger for a one-cell lithium-ion (Li+) battery. Signed-off-by: Svyatoslav Ryhel --- Documentation/ABI/testing/sysfs-class-power | 43 ++ drivers/power/supply/Kconfig | 14 + drivers/power/supply/Makefile | 1 + drivers/power/supply/max8971_charger.c | 750 ++++++++++++++++++++ 4 files changed, 808 insertions(+) create mode 100644 drivers/power/supply/max8971_charger.c diff --git a/Documentation/ABI/testing/sysfs-class-power b/Documentation/ABI/testing/sysfs-class-power index 45180b62d426..9053431def5f 100644 --- a/Documentation/ABI/testing/sysfs-class-power +++ b/Documentation/ABI/testing/sysfs-class-power @@ -793,3 +793,46 @@ Description: Access: Read Valid values: 1-31 + +What: /sys/class/power_supply/max8971-charger/fast_charge_timer +Date: March 2025 +KernelVersion: 6.14.0 +Contact: Svyatoslav Ryhel +Description: + This entry shows and sets the maximum time the max8971 + charger operates in fast-charge mode. When the timer expires + the device will terminate fast-charge mode (charging current + will drop to 0 A) and will trigger interrupt. + + Valid values: + + - 4 - 10 (hours), step by 1 + - 0: disabled. + +What: /sys/class/power_supply/max8971-charger/top_off_threshold_current +Date: March 2025 +KernelVersion: 6.14.0 +Contact: Svyatoslav Ryhel +Description: + This entry shows and sets the charging current threshold for + entering top-off charging mode. When charging current in fast + charge mode drops below this value, the charger will trigger + interrupt and start top-off charging mode. + + Valid values: + + - 50000 - 200000 (microamps), step by 50000 (rounded down) + +What: /sys/class/power_supply/max8971-charger/top_off_timer +Date: March 2025 +KernelVersion: 6.14.0 +Contact: Svyatoslav Ryhel +Description: + This entry shows and sets the maximum time the max8971 + charger operates in top-off charge mode. When the timer expires + the device will terminate top-off charge mode (charging current + will drop to 0 A) and will trigger interrupt. + + Valid values: + + - 0 - 70 (minutes), step by 10 (rounded down) diff --git a/drivers/power/supply/Kconfig b/drivers/power/supply/Kconfig index 9f2eef6787f7..7c86116c2947 100644 --- a/drivers/power/supply/Kconfig +++ b/drivers/power/supply/Kconfig @@ -595,6 +595,20 @@ config CHARGER_MAX77976 This driver can also be built as a module. If so, the module will be called max77976_charger. +config CHARGER_MAX8971 + tristate "Maxim MAX8971 battery charger driver" + depends on I2C + select REGMAP_I2C + help + The MAX8971 is a compact, high-frequency, high-efficiency switch-mode + charger for a one-cell lithium-ion (Li+) battery. It delivers up to + 1.55A of current to the battery from inputs up to 7.5V and withstands + transient inputs up to 22V. + + Say Y to enable support for the Maxim MAX8971 battery charger. + This driver can also be built as a module. If so, the module will be + called max8971_charger. + config CHARGER_MAX8997 tristate "Maxim MAX8997/MAX8966 PMIC battery charger driver" depends on MFD_MAX8997 && REGULATOR_MAX8997 diff --git a/drivers/power/supply/Makefile b/drivers/power/supply/Makefile index 59c4a9f40d28..8fa051ff87ff 100644 --- a/drivers/power/supply/Makefile +++ b/drivers/power/supply/Makefile @@ -81,6 +81,7 @@ obj-$(CONFIG_CHARGER_DETECTOR_MAX14656) += max14656_charger_detector.o obj-$(CONFIG_CHARGER_MAX77650) += max77650-charger.o obj-$(CONFIG_CHARGER_MAX77693) += max77693_charger.o obj-$(CONFIG_CHARGER_MAX77976) += max77976_charger.o +obj-$(CONFIG_CHARGER_MAX8971) += max8971_charger.o obj-$(CONFIG_CHARGER_MAX8997) += max8997_charger.o obj-$(CONFIG_CHARGER_MAX8998) += max8998_charger.o obj-$(CONFIG_CHARGER_MP2629) += mp2629_charger.o diff --git a/drivers/power/supply/max8971_charger.c b/drivers/power/supply/max8971_charger.c new file mode 100644 index 000000000000..65ff04bb4c33 --- /dev/null +++ b/drivers/power/supply/max8971_charger.c @@ -0,0 +1,750 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define MAX8971_REG_CHGINT 0x0f +#define MAX8971_REG_CHG_RST BIT(0) +#define MAX8971_REG_CHGINT_MASK 0x01 +#define MAX8971_AICL_MASK BIT(7) +#define MAX8971_REG_CHG_STAT 0x02 +#define MAX8971_CHG_MASK BIT(3) +#define MAX8971_REG_DETAILS1 0x03 +#define MAX8971_REG_DETAILS2 0x04 +#define MAX8971_REG_CHGCNTL1 0x05 +#define MAX8971_REG_FCHGCRNT 0x06 +#define MAX8971_REG_DCCRNT 0x07 +#define MAX8971_CHGRSTRT_MASK BIT(6) +#define MAX8971_REG_TOPOFF 0x08 +#define MAX8971_REG_TEMPREG 0x09 +#define MAX8971_REG_PROTCMD 0x0a +#define MAX8971_CHGPROT_LOCKED 0x00 +#define MAX8971_CHGPROT_UNLOCKED 0x03 + +#define MAX8971_FCHGT_DEFAULT 2 +#define MAX8971_TOPOFFT_DEFAULT 3 + +static const char *max8971_manufacturer = "Maxim Integrated"; +static const char *max8971_model = "MAX8971"; + +enum max8971_charging_state { + MAX8971_CHARGING_DEAD_BATTERY, + MAX8971_CHARGING_PREQUALIFICATION, + MAX8971_CHARGING_FAST_CONST_CURRENT, + MAX8971_CHARGING_FAST_CONST_VOLTAGE, + MAX8971_CHARGING_TOP_OFF, + MAX8971_CHARGING_DONE, + MAX8971_CHARGING_TIMER_FAULT, + MAX8971_CHARGING_SUSPENDED_THERMAL, + MAX8971_CHARGING_OFF, + MAX8971_CHARGING_THERMAL_LOOP, +}; + +enum max8971_health_state { + MAX8971_HEALTH_UNKNOWN, + MAX8971_HEALTH_COLD, + MAX8971_HEALTH_COOL, + MAX8971_HEALTH_WARM, + MAX8971_HEALTH_HOT, + MAX8971_HEALTH_OVERHEAT, +}; + +/* Fast-Charge current limit, 250..1550 mA, 50 mA steps */ +#define MAX8971_CHG_CC_STEP 50000U +#define MAX8971_CHG_CC_MIN 250000U +#define MAX8971_CHG_CC_MAX 1550000U + +/* Input current limit, 250..1500 mA, 25 mA steps */ +#define MAX8971_DCILMT_STEP 25000U +#define MAX8971_DCILMT_MIN 250000U +#define MAX8971_DCILMT_MAX 1500000U + +enum max8971_field_idx { + THM_DTLS, /* DETAILS1 */ + BAT_DTLS, CHG_DTLS, /* DETAILS2 */ + CHG_CC, FCHG_T, /* FCHGCRNT */ + DCI_LMT, /* DCCRNT */ + TOPOFF_T, TOPOFF_S, /* TOPOFF */ + CPROT, /* PROTCMD */ + MAX8971_N_REGMAP_FIELDS +}; + +static const struct reg_field max8971_reg_field[MAX8971_N_REGMAP_FIELDS] = { + [THM_DTLS] = REG_FIELD(MAX8971_REG_DETAILS1, 0, 2), + [BAT_DTLS] = REG_FIELD(MAX8971_REG_DETAILS2, 4, 5), + [CHG_DTLS] = REG_FIELD(MAX8971_REG_DETAILS2, 0, 3), + [CHG_CC] = REG_FIELD(MAX8971_REG_FCHGCRNT, 0, 4), + [FCHG_T] = REG_FIELD(MAX8971_REG_FCHGCRNT, 5, 7), + [DCI_LMT] = REG_FIELD(MAX8971_REG_DCCRNT, 0, 5), + [TOPOFF_T] = REG_FIELD(MAX8971_REG_TOPOFF, 5, 7), + [TOPOFF_S] = REG_FIELD(MAX8971_REG_TOPOFF, 2, 3), + [CPROT] = REG_FIELD(MAX8971_REG_PROTCMD, 2, 3), +}; + +static const struct regmap_config max8971_regmap_config = { + .reg_bits = 8, + .val_bits = 8, + .max_register = MAX8971_REG_CHGINT, +}; + +struct max8971_data { + struct device *dev; + struct power_supply *psy_mains; + + struct extcon_dev *edev; + struct notifier_block extcon_nb; + struct delayed_work extcon_work; + + struct regmap *regmap; + struct regmap_field *rfield[MAX8971_N_REGMAP_FIELDS]; + + enum power_supply_usb_type usb_type; + + u32 fchgt; + u32 tofft; + u32 toffs; + + bool present; +}; + +static int max8971_get_status(struct max8971_data *priv, int *val) +{ + u32 regval; + int err; + + err = regmap_field_read(priv->rfield[CHG_DTLS], ®val); + if (err) + return err; + + switch (regval) { + case MAX8971_CHARGING_DEAD_BATTERY: + case MAX8971_CHARGING_PREQUALIFICATION: + case MAX8971_CHARGING_FAST_CONST_CURRENT: + case MAX8971_CHARGING_FAST_CONST_VOLTAGE: + case MAX8971_CHARGING_TOP_OFF: + case MAX8971_CHARGING_THERMAL_LOOP: + *val = POWER_SUPPLY_STATUS_CHARGING; + break; + case MAX8971_CHARGING_DONE: + *val = POWER_SUPPLY_STATUS_FULL; + break; + case MAX8971_CHARGING_TIMER_FAULT: + *val = POWER_SUPPLY_STATUS_NOT_CHARGING; + break; + case MAX8971_CHARGING_OFF: + case MAX8971_CHARGING_SUSPENDED_THERMAL: + *val = POWER_SUPPLY_STATUS_DISCHARGING; + break; + default: + *val = POWER_SUPPLY_STATUS_UNKNOWN; + } + + return 0; +} + +static int max8971_get_charge_type(struct max8971_data *priv, int *val) +{ + u32 regval; + int err; + + err = regmap_field_read(priv->rfield[CHG_DTLS], ®val); + if (err) + return err; + + switch (regval) { + case MAX8971_CHARGING_DEAD_BATTERY: + case MAX8971_CHARGING_PREQUALIFICATION: + *val = POWER_SUPPLY_CHARGE_TYPE_TRICKLE; + break; + case MAX8971_CHARGING_FAST_CONST_CURRENT: + case MAX8971_CHARGING_FAST_CONST_VOLTAGE: + *val = POWER_SUPPLY_CHARGE_TYPE_FAST; + break; + case MAX8971_CHARGING_TOP_OFF: + case MAX8971_CHARGING_THERMAL_LOOP: + *val = POWER_SUPPLY_CHARGE_TYPE_STANDARD; + break; + case MAX8971_CHARGING_DONE: + case MAX8971_CHARGING_TIMER_FAULT: + case MAX8971_CHARGING_SUSPENDED_THERMAL: + case MAX8971_CHARGING_OFF: + *val = POWER_SUPPLY_CHARGE_TYPE_NONE; + break; + default: + *val = POWER_SUPPLY_CHARGE_TYPE_UNKNOWN; + } + + return 0; +} + +static int max8971_get_health(struct max8971_data *priv, int *val) +{ + u32 regval; + int err; + + err = regmap_field_read(priv->rfield[THM_DTLS], ®val); + if (err) + return err; + + switch (regval) { + case MAX8971_HEALTH_COLD: + *val = POWER_SUPPLY_HEALTH_COLD; + break; + case MAX8971_HEALTH_COOL: + *val = POWER_SUPPLY_HEALTH_COOL; + break; + case MAX8971_HEALTH_WARM: + *val = POWER_SUPPLY_HEALTH_GOOD; + break; + case MAX8971_HEALTH_HOT: + *val = POWER_SUPPLY_HEALTH_HOT; + break; + case MAX8971_HEALTH_OVERHEAT: + *val = POWER_SUPPLY_HEALTH_OVERHEAT; + break; + case MAX8971_HEALTH_UNKNOWN: + default: + *val = POWER_SUPPLY_HEALTH_UNKNOWN; + } + + return 0; +} + +static int max8971_get_online(struct max8971_data *priv, int *val) +{ + u32 regval; + int err; + + err = regmap_read(priv->regmap, MAX8971_REG_CHG_STAT, ®val); + if (err) + return err; + + if (priv->present) + /* CHG_OK bit is 0 when charger is online */ + *val = !(regval & MAX8971_CHG_MASK); + else + *val = priv->present; + + return 0; +} + +static int max8971_get_integer(struct max8971_data *priv, enum max8971_field_idx fidx, + u32 clamp_min, u32 clamp_max, u32 mult, int *val) +{ + u32 regval; + int err; + + err = regmap_field_read(priv->rfield[fidx], ®val); + if (err) + return err; + + *val = clamp_val(regval * mult, clamp_min, clamp_max); + + return 0; +} + +static int max8971_set_integer(struct max8971_data *priv, enum max8971_field_idx fidx, + u32 clamp_min, u32 clamp_max, u32 div, int val) +{ + u32 regval; + + regval = clamp_val(val, clamp_min, clamp_max) / div; + + return regmap_field_write(priv->rfield[fidx], regval); +} + +static int max8971_get_property(struct power_supply *psy, enum power_supply_property psp, + union power_supply_propval *val) +{ + struct max8971_data *priv = power_supply_get_drvdata(psy); + int err = 0; + + switch (psp) { + case POWER_SUPPLY_PROP_STATUS: + err = max8971_get_status(priv, &val->intval); + break; + case POWER_SUPPLY_PROP_CHARGE_TYPE: + err = max8971_get_charge_type(priv, &val->intval); + break; + case POWER_SUPPLY_PROP_USB_TYPE: + val->intval = priv->usb_type; + break; + case POWER_SUPPLY_PROP_HEALTH: + err = max8971_get_health(priv, &val->intval); + break; + case POWER_SUPPLY_PROP_ONLINE: + err = max8971_get_online(priv, &val->intval); + break; + case POWER_SUPPLY_PROP_PRESENT: + val->intval = priv->present; + break; + case POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT_MAX: + val->intval = MAX8971_CHG_CC_MAX; + break; + case POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT: + err = max8971_get_integer(priv, CHG_CC, MAX8971_CHG_CC_MIN, MAX8971_CHG_CC_MAX, + MAX8971_CHG_CC_STEP, &val->intval); + break; + case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT: + err = max8971_get_integer(priv, DCI_LMT, MAX8971_DCILMT_MIN, MAX8971_DCILMT_MAX, + MAX8971_DCILMT_STEP, &val->intval); + break; + case POWER_SUPPLY_PROP_MODEL_NAME: + val->strval = max8971_model; + break; + case POWER_SUPPLY_PROP_MANUFACTURER: + val->strval = max8971_manufacturer; + break; + default: + err = -EINVAL; + } + + return err; +} + +static int max8971_set_property(struct power_supply *psy, enum power_supply_property psp, + const union power_supply_propval *val) +{ + struct max8971_data *priv = power_supply_get_drvdata(psy); + int err = 0; + + switch (psp) { + case POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT: + err = max8971_set_integer(priv, CHG_CC, MAX8971_CHG_CC_MIN, MAX8971_CHG_CC_MAX, + MAX8971_CHG_CC_STEP, val->intval); + break; + case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT: + err = max8971_set_integer(priv, DCI_LMT, MAX8971_DCILMT_MIN, MAX8971_DCILMT_MAX, + MAX8971_DCILMT_STEP, val->intval); + break; + default: + err = -EINVAL; + } + + return err; +}; + +static int max8971_property_is_writeable(struct power_supply *psy, + enum power_supply_property psp) +{ + switch (psp) { + case POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT: + case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT: + return true; + default: + return false; + } +} + +static enum power_supply_property max8971_properties[] = { + POWER_SUPPLY_PROP_STATUS, + POWER_SUPPLY_PROP_CHARGE_TYPE, + POWER_SUPPLY_PROP_USB_TYPE, + POWER_SUPPLY_PROP_HEALTH, + POWER_SUPPLY_PROP_ONLINE, + POWER_SUPPLY_PROP_PRESENT, + POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT, + POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT_MAX, + POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT, + POWER_SUPPLY_PROP_MODEL_NAME, + POWER_SUPPLY_PROP_MANUFACTURER, +}; + +static const struct power_supply_desc max8971_charger_desc = { + .name = "max8971-charger", + .type = POWER_SUPPLY_TYPE_USB, + .usb_types = BIT(POWER_SUPPLY_USB_TYPE_UNKNOWN) | + BIT(POWER_SUPPLY_USB_TYPE_SDP) | + BIT(POWER_SUPPLY_USB_TYPE_DCP) | + BIT(POWER_SUPPLY_USB_TYPE_CDP) | + BIT(POWER_SUPPLY_USB_TYPE_ACA), + .properties = max8971_properties, + .num_properties = ARRAY_SIZE(max8971_properties), + .get_property = max8971_get_property, + .set_property = max8971_set_property, + .property_is_writeable = max8971_property_is_writeable, +}; + +static void max8971_update_config(struct max8971_data *priv) +{ + regmap_field_write(priv->rfield[CPROT], MAX8971_CHGPROT_UNLOCKED); + + if (priv->fchgt != MAX8971_FCHGT_DEFAULT) + regmap_field_write(priv->rfield[FCHG_T], priv->fchgt); + + regmap_write_bits(priv->regmap, MAX8971_REG_DCCRNT, MAX8971_CHGRSTRT_MASK, + MAX8971_CHGRSTRT_MASK); + + if (priv->tofft != MAX8971_TOPOFFT_DEFAULT) + regmap_field_write(priv->rfield[TOPOFF_T], priv->tofft); + + if (priv->toffs) + regmap_field_write(priv->rfield[TOPOFF_S], priv->toffs); + + regmap_field_write(priv->rfield[CPROT], MAX8971_CHGPROT_LOCKED); +} + +static ssize_t fast_charge_timer_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct power_supply *psy = to_power_supply(dev); + struct max8971_data *priv = power_supply_get_drvdata(psy); + u32 regval; + int err; + + err = regmap_field_read(priv->rfield[FCHG_T], ®val); + if (err) + return err; + + switch (regval) { + case 0x1 ... 0x7: + /* Time is off by 3 hours comparing to value */ + regval += 3; + break; + case 0x0: + default: + regval = 0; + break; + } + + return sysfs_emit(buf, "%u\n", regval); +} + +static ssize_t fast_charge_timer_store(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct power_supply *psy = to_power_supply(dev); + struct max8971_data *priv = power_supply_get_drvdata(psy); + unsigned long hours; + int val, err; + + err = kstrtoul(buf, 10, &hours); + if (err) + return err; + + val = hours - 3; + if (val <= 0 || val > 7) + priv->fchgt = 0; + else + priv->fchgt = val; + + max8971_update_config(priv); + + return count; +} + +static ssize_t top_off_threshold_current_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct power_supply *psy = to_power_supply(dev); + struct max8971_data *priv = power_supply_get_drvdata(psy); + u32 regval, val; + int err; + + err = regmap_field_read(priv->rfield[TOPOFF_S], ®val); + if (err) + return err; + + /* 50uA start with 50uA step */ + val = regval * 50 + 50; + val *= 1000; + + return sysfs_emit(buf, "%u\n", val); +} + +static ssize_t top_off_threshold_current_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct power_supply *psy = to_power_supply(dev); + struct max8971_data *priv = power_supply_get_drvdata(psy); + unsigned long uamp; + int err; + + err = kstrtoul(buf, 10, &uamp); + if (err) + return err; + + if (uamp < 50000 || uamp > 200000) + return -EINVAL; + + priv->toffs = uamp / 50000 - 1; + + max8971_update_config(priv); + + return count; +} + +static ssize_t top_off_timer_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct power_supply *psy = to_power_supply(dev); + struct max8971_data *priv = power_supply_get_drvdata(psy); + u32 regval; + int err; + + err = regmap_field_read(priv->rfield[TOPOFF_T], ®val); + if (err) + return err; + + /* 10 min intervals */ + regval *= 10; + + return sysfs_emit(buf, "%u\n", regval); +} + +static ssize_t top_off_timer_store(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct power_supply *psy = to_power_supply(dev); + struct max8971_data *priv = power_supply_get_drvdata(psy); + unsigned long minutes; + int err; + + err = kstrtoul(buf, 10, &minutes); + if (err) + return err; + + if (minutes > 70) + return -EINVAL; + + priv->tofft = minutes / 10; + + max8971_update_config(priv); + + return count; +} + +static DEVICE_ATTR_RW(fast_charge_timer); +static DEVICE_ATTR_RW(top_off_threshold_current); +static DEVICE_ATTR_RW(top_off_timer); + +static struct attribute *max8971_attrs[] = { + &dev_attr_fast_charge_timer.attr, + &dev_attr_top_off_threshold_current.attr, + &dev_attr_top_off_timer.attr, + NULL +}; +ATTRIBUTE_GROUPS(max8971); + +static void max8971_extcon_evt_worker(struct work_struct *work) +{ + struct max8971_data *priv = + container_of(work, struct max8971_data, extcon_work.work); + struct device *dev = priv->dev; + struct extcon_dev *edev = priv->edev; + u32 chgcc, dcilmt; + + if (extcon_get_state(edev, EXTCON_CHG_USB_SDP) > 0) { + dev_dbg(dev, "USB SDP charger is connected\n"); + priv->usb_type = POWER_SUPPLY_USB_TYPE_SDP; + chgcc = 500000; + dcilmt = 500000; + } else if (extcon_get_state(edev, EXTCON_USB) > 0) { + dev_dbg(dev, "USB charger is connected\n"); + priv->usb_type = POWER_SUPPLY_USB_TYPE_SDP; + chgcc = 500000; + dcilmt = 500000; + } else if (extcon_get_state(edev, EXTCON_DISP_MHL) > 0) { + dev_dbg(dev, "MHL plug is connected\n"); + priv->usb_type = POWER_SUPPLY_USB_TYPE_SDP; + chgcc = 500000; + dcilmt = 500000; + } else if (extcon_get_state(edev, EXTCON_CHG_USB_DCP) > 0) { + dev_dbg(dev, "USB DCP charger is connected\n"); + priv->usb_type = POWER_SUPPLY_USB_TYPE_DCP; + chgcc = 900000; + dcilmt = 1200000; + } else if (extcon_get_state(edev, EXTCON_CHG_USB_FAST) > 0) { + dev_dbg(dev, "USB FAST charger is connected\n"); + priv->usb_type = POWER_SUPPLY_USB_TYPE_ACA; + chgcc = 900000; + dcilmt = 1200000; + } else if (extcon_get_state(edev, EXTCON_CHG_USB_SLOW) > 0) { + dev_dbg(dev, "USB SLOW charger is connected\n"); + priv->usb_type = POWER_SUPPLY_USB_TYPE_ACA; + chgcc = 900000; + dcilmt = 1200000; + } else if (extcon_get_state(edev, EXTCON_CHG_USB_CDP) > 0) { + dev_dbg(dev, "USB CDP charger is connected\n"); + priv->usb_type = POWER_SUPPLY_USB_TYPE_CDP; + chgcc = 900000; + dcilmt = 1200000; + } else { + dev_dbg(dev, "USB state is unknown\n"); + priv->usb_type = POWER_SUPPLY_USB_TYPE_UNKNOWN; + return; + } + + regmap_field_write(priv->rfield[CPROT], MAX8971_CHGPROT_UNLOCKED); + + max8971_set_integer(priv, CHG_CC, MAX8971_CHG_CC_MIN, MAX8971_CHG_CC_MAX, + MAX8971_CHG_CC_STEP, chgcc); + max8971_set_integer(priv, DCI_LMT, MAX8971_DCILMT_MIN, MAX8971_DCILMT_MAX, + MAX8971_DCILMT_STEP, dcilmt); + + regmap_field_write(priv->rfield[CPROT], MAX8971_CHGPROT_LOCKED); +} + +static int extcon_get_charger_type(struct notifier_block *nb, + unsigned long state, void *data) +{ + struct max8971_data *priv = + container_of(nb, struct max8971_data, extcon_nb); + schedule_delayed_work(&priv->extcon_work, 0); + return NOTIFY_OK; +} + +static irqreturn_t max8971_interrupt(int irq, void *dev_id) +{ + struct max8971_data *priv = dev_id; + struct device *dev = priv->dev; + int err, state; + + err = regmap_read(priv->regmap, MAX8971_REG_CHGINT, &state); + if (err) + dev_err(dev, "interrupt reg read failed %d\n", err); + + err = regmap_write_bits(priv->regmap, MAX8971_REG_CHGINT_MASK, + MAX8971_AICL_MASK, MAX8971_AICL_MASK); + if (err) + dev_err(dev, "failed to mask IRQ\n"); + + /* set presence prop */ + priv->present = state & MAX8971_REG_CHG_RST; + + /* on every plug chip resets to default */ + if (priv->present) + max8971_update_config(priv); + + /* update supply status */ + power_supply_changed(priv->psy_mains); + + return IRQ_HANDLED; +} + +static int max8971_probe(struct i2c_client *client) +{ + struct device *dev = &client->dev; + struct max8971_data *priv; + struct device_node *extcon; + struct power_supply_config cfg = { }; + int err, i; + + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + priv->dev = dev; + priv->usb_type = POWER_SUPPLY_USB_TYPE_UNKNOWN; + + i2c_set_clientdata(client, priv); + + priv->regmap = devm_regmap_init_i2c(client, &max8971_regmap_config); + if (IS_ERR(priv->regmap)) + return dev_err_probe(dev, PTR_ERR(priv->regmap), "cannot allocate regmap\n"); + + for (i = 0; i < MAX8971_N_REGMAP_FIELDS; i++) { + priv->rfield[i] = devm_regmap_field_alloc(dev, priv->regmap, max8971_reg_field[i]); + if (IS_ERR(priv->rfield[i])) + return dev_err_probe(dev, PTR_ERR(priv->rfield[i]), + "cannot allocate regmap field\n"); + } + + cfg.attr_grp = max8971_groups; + cfg.drv_data = priv; + cfg.fwnode = dev_fwnode(dev); + + priv->psy_mains = devm_power_supply_register(dev, &max8971_charger_desc, &cfg); + if (IS_ERR(priv->psy_mains)) + return dev_err_probe(dev, PTR_ERR(priv->psy_mains), + "failed to register mains supply\n"); + + err = regmap_write_bits(priv->regmap, MAX8971_REG_CHGINT_MASK, MAX8971_AICL_MASK, + MAX8971_AICL_MASK); + if (err) + return dev_err_probe(dev, err, "failed to mask IRQ\n"); + + err = devm_request_threaded_irq(dev, client->irq, NULL, &max8971_interrupt, + IRQF_ONESHOT | IRQF_SHARED, client->name, priv); + if (err) + return dev_err_probe(dev, err, "failed to register IRQ %d\n", client->irq); + + extcon = of_graph_get_remote_node(dev->of_node, -1, -1); + if (!extcon) + return 0; + + priv->edev = extcon_find_edev_by_node(extcon); + of_node_put(extcon); + if (IS_ERR(priv->edev)) + return dev_err_probe(dev, PTR_ERR(priv->edev), "failed to find extcon\n"); + + err = devm_delayed_work_autocancel(dev, &priv->extcon_work, + max8971_extcon_evt_worker); + if (err) + return dev_err_probe(dev, err, "failed to add extcon evt stop action\n"); + + priv->extcon_nb.notifier_call = extcon_get_charger_type; + + err = devm_extcon_register_notifier_all(dev, priv->edev, &priv->extcon_nb); + if (err) + return dev_err_probe(dev, err, "failed to register notifier\n"); + + /* Initial configuration work with 1 sec delay */ + schedule_delayed_work(&priv->extcon_work, msecs_to_jiffies(1000)); + + return 0; +} + +static int __maybe_unused max8971_resume(struct device *dev) +{ + struct i2c_client *client = to_i2c_client(dev); + struct max8971_data *priv = i2c_get_clientdata(client); + + irq_wake_thread(client->irq, priv); + + return 0; +} + +static SIMPLE_DEV_PM_OPS(max8971_pm_ops, NULL, max8971_resume); + +static const struct of_device_id max8971_match_ids[] = { + { .compatible = "maxim,max8971" }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, max8971_match_ids); + +static const struct i2c_device_id max8971_i2c_id[] = { + { "max8971" }, + { } +}; +MODULE_DEVICE_TABLE(i2c, max8971_i2c_id); + +static struct i2c_driver max8971_driver = { + .driver = { + .name = "max8971-charger", + .of_match_table = max8971_match_ids, + .pm = &max8971_pm_ops, + }, + .probe = max8971_probe, + .id_table = max8971_i2c_id, +}; +module_i2c_driver(max8971_driver); + +MODULE_AUTHOR("Svyatoslav Ryhel "); +MODULE_DESCRIPTION("MAX8971 Charger Driver"); +MODULE_LICENSE("GPL");