[PATCH v3 14/23] power: supply: max77705: Add charger driver for Maxim 77705

Dzmitry Sankouski
2024-06-18T14:00:21Z

Add driver for Maxim 77705 switch-mode charger (part of max77705
MFD driver) providing power supply class information to userspace.

The driver is configured through DTS (battery and system related
settings). Also, POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE property
is writable, which allows to configure charge end at less than 100%

Signed-off-by: Dzmitry Sankouski <dsankouski@gmail.com>
---
drivers/power/supply/Kconfig | 6 +
drivers/power/supply/Makefile | 1 +
drivers/power/supply/max77705_charger.c | 772 ++++++++++++++++++++++++++++++++
include/linux/mfd/max77705_charger.h | 225 ++++++++++
4 files changed, 1004 insertions(+)

diff --git a/drivers/power/supply/Kconfig b/drivers/power/supply/Kconfig
index 3e31375491d5..47ca8cc00a80 100644
--- a/drivers/power/supply/Kconfig
+++ b/drivers/power/supply/Kconfig
@@ -552,6 +552,12 @@ config CHARGER_MAX77693
help
Say Y to enable support for the Maxim MAX77693 battery charger.

+config CHARGER_MAX77705
+ tristate "Maxim MAX77705 battery charger driver"
+ depends on MFD_MAX77705
+ help
+ Say Y to enable support for the Maxim MAX77705 battery charger.
+
config CHARGER_MAX77976
tristate "Maxim MAX77976 battery charger driver"
depends on I2C
diff --git a/drivers/power/supply/Makefile b/drivers/power/supply/Makefile
index 58b567278034..dbec648c78c9 100644
--- a/drivers/power/supply/Makefile
+++ b/drivers/power/supply/Makefile
@@ -77,6 +77,7 @@ obj-$(CONFIG_CHARGER_MAX14577) += max14577_charger.o
obj-$(CONFIG_CHARGER_DETECTOR_MAX14656) += max14656_charger_detector.o
obj-$(CONFIG_CHARGER_MAX77650) += max77650-charger.o
obj-$(CONFIG_CHARGER_MAX77693) += max77693_charger.o
+obj-$(CONFIG_CHARGER_MAX77705) += max77705_charger.o
obj-$(CONFIG_CHARGER_MAX77976) += max77976_charger.o
obj-$(CONFIG_CHARGER_MAX8997) += max8997_charger.o
obj-$(CONFIG_CHARGER_MAX8998) += max8998_charger.o
diff --git a/drivers/power/supply/max77705_charger.c b/drivers/power/supply/max77705_charger.c
new file mode 100644
index 000000000000..2b3e836d4c55
--- /dev/null
+++ b/drivers/power/supply/max77705_charger.c
@@ -0,0 +1,772 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * max77705_charger.c - Battery charger driver for the Maxim 77705
+ *
+ * Copyright (C) 2014 Samsung Electronics
+ * Krzysztof Kozlowski <krzk@kernel.org>
+ * Copyright (C) 2024 Dzmitry Sankouski <dsankouski@gmail.org>
+ */
+
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/debugfs.h>
+#include <linux/power_supply.h>
+#include <linux/regmap.h>
+
+#include <linux/mfd/max77705.h>
+#include <linux/mfd/max77705_charger.h>
+#include <linux/mfd/max77705-private.h>
+
+#define MAX77705_CHARGER_NAME "max77705-charger"
+static const char *max77705_charger_model = "max77705";
+static const char *max77705_charger_manufacturer = "Maxim Integrated";
+static struct dentry *debugfs_file;
+
+static enum power_supply_property max77705_charger_props[] = {
+ POWER_SUPPLY_PROP_ONLINE,
+ POWER_SUPPLY_PROP_PRESENT,
+ POWER_SUPPLY_PROP_STATUS,
+ POWER_SUPPLY_PROP_CHARGE_TYPE,
+ POWER_SUPPLY_PROP_HEALTH,
+ POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
+ POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE,
+ POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT,
+ POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT,
+};
+
+static int max77705_get_online(struct regmap *regmap, int *val)
+{
+ unsigned int data;
+ int ret;
+
+ ret = regmap_read(regmap, MAX77705_CHG_REG_INT_OK, &data);
+ if (ret < 0)
+ return ret;
+
+ *val = !!(data & MAX77705_CHGIN_OK);
+
+ return 0;
+}
+
+static int max77705_get_charger_state(struct max77705_charger_data *charger)
+{
+ struct regmap *regmap = charger->max77705->regmap_charger;
+ int status = POWER_SUPPLY_STATUS_UNKNOWN;
+ unsigned int reg_data;
+
+ regmap_read(regmap, MAX77705_CHG_REG_DETAILS_01, &reg_data);
+
+ pr_debug("%s: charger status (0x%02x)\n", __func__, reg_data);
+
+ reg_data &= 0x0f;
+
+ switch (reg_data) {
+ case 0x0:
+ case MAX77705_CHARGER_CONSTANT_CURRENT:
+ case MAX77705_CHARGER_CONSTANT_VOLTAGE:
+ status = POWER_SUPPLY_STATUS_CHARGING;
+ break;
+ case MAX77705_CHARGER_END_OF_CHARGE:
+ case MAX77705_CHARGER_DONE:
+ status = POWER_SUPPLY_STATUS_FULL;
+ break;
+ case 0x05:
+ case 0x06:
+ case 0x07:
+ status = POWER_SUPPLY_STATUS_NOT_CHARGING;
+ break;
+ case 0x08:
+ case 0xA:
+ case 0xB:
+ status = POWER_SUPPLY_STATUS_DISCHARGING;
+ break;
+ default:
+ status = POWER_SUPPLY_STATUS_UNKNOWN;
+ break;
+ }
+
+ return (int)status;
+}
+
+static int max77705_get_battery_health(struct regmap *regmap, int *value)
+{
+ unsigned int bat_dtls;
+
+ regmap_read(regmap, MAX77705_CHG_REG_DETAILS_01, &bat_dtls);
+ bat_dtls = ((bat_dtls & MAX77705_BAT_DTLS) >> MAX77705_BAT_DTLS_SHIFT);
+
+ pr_debug("%s: bat_dtls(0x%x)\n", __func__, bat_dtls);
+
+ switch (bat_dtls) {
+ case MAX77705_BATTERY_NOBAT:
+ pr_debug("%s: No battery and the charger is suspended\n", __func__);
+ *value = POWER_SUPPLY_HEALTH_NO_BATTERY;
+ break;
+ case MAX77705_BATTERY_PREQUALIFICATION:
+ pr_debug("%s: battery is okay but its voltage is low(~VPQLB)\n", __func__);
+ break;
+ case MAX77705_BATTERY_DEAD:
+ pr_debug("%s: battery dead\n", __func__);
+ *value = POWER_SUPPLY_HEALTH_DEAD;
+ break;
+ case MAX77705_BATTERY_GOOD:
+ case MAX77705_BATTERY_LOWVOLTAGE:
+ *value = POWER_SUPPLY_HEALTH_GOOD;
+ break;
+ case MAX77705_BATTERY_OVERVOLTAGE:
+ pr_debug("%s: battery ovp\n", __func__);
+ *value = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
+ break;
+ default:
+ pr_debug("%s: battery unknown\n", __func__);
+ *value = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
+ break;
+ }
+
+ return 0;
+}
+
+static int max77705_get_vbus_state(struct regmap *regmap, int *value)
+{
+ int ret;
+ unsigned int charge_dtls;
+
+ ret = regmap_read(regmap, MAX77705_CHG_REG_DETAILS_00, &charge_dtls);
+ if (ret)
+ return ret;
+
+ charge_dtls = ((charge_dtls & MAX77705_CHGIN_DTLS) >>
+ MAX77705_CHGIN_DTLS_SHIFT);
+
+ switch (charge_dtls) {
+ case 0x00:
+ *value = POWER_SUPPLY_HEALTH_UNDERVOLTAGE;
+ break;
+ case 0x01:
+ *value = POWER_SUPPLY_HEALTH_UNDERVOLTAGE;
+ break;
+ case 0x02:
+ *value = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
+ break;
+ case 0x03:
+ *value = POWER_SUPPLY_HEALTH_GOOD;
+ break;
+ default:
+ return 0;
+ }
+ return 0;
+}
+
+static int max77705_get_health(struct regmap *regmap, int *value)
+{
+ int ret, is_online = 0;
+
+ ret = max77705_get_online(regmap, &is_online);
+ if (ret)
+ return ret;
+ if (is_online) {
+ ret = max77705_get_vbus_state(regmap, value);
+ if (ret || (*value != POWER_SUPPLY_HEALTH_GOOD))
+ return ret;
+ }
+ ret = max77705_get_battery_health(regmap, value);
+ if (ret)
+ return ret;
+ return ret;
+}
+
+static int max77705_get_input_current(struct max77705_charger_data *charger)
+{
+ unsigned int reg_data;
+ int get_current = 0;
+ struct regmap *regmap = charger->max77705->regmap_charger;
+
+ regmap_read(regmap,
+ MAX77705_CHG_REG_CNFG_09, &reg_data);
+ /* AND operation for removing the formal 1bit */
+ reg_data &= MAX77705_CHG_CHGIN_LIM_MASK;
+
+ if (reg_data <= 0x3)
+ get_current = 100;
+ else if (reg_data >= 0x7F)
+ get_current = 3200;
+ else
+ get_current = (reg_data + 0x01) * 25;
+
+ dev_dbg(charger->dev, "reg:(0x%x), charging_current:(%d)\n",
+ reg_data, get_current);
+
+ return get_current;
+}
+
+static void max77705_set_input_current(struct max77705_charger_data *charger,
+ int input_current)
+{
+ int curr_step = 25;
+ u8 set_reg, set_mask, reg_data = 0;
+ struct regmap *regmap = charger->max77705->regmap_charger;
+
+ mutex_lock(&charger->charger_mutex);
+
+
+ set_reg = MAX77705_CHG_REG_CNFG_09;
+ set_mask = MAX77705_CHG_CHGIN_LIM_MASK;
+
+ if (input_current < 100) {
+ reg_data = 0x00;
+ regmap_update_bits(regmap, set_reg, set_mask, reg_data);
+ } else {
+ input_current = (input_current > 3200) ? 3200 : input_current;
+ reg_data = (input_current / curr_step) - 0x01;
+ regmap_update_bits(regmap, set_reg, set_mask, reg_data);
+ }
+
+ mutex_unlock(&charger->charger_mutex);
+ dev_dbg(charger->dev, "REG(0x%02x) DATA(0x%02x), CURRENT(%d)\n",
+ set_reg, reg_data, input_current);
+}
+
+static int max77705_get_float_voltage(struct max77705_charger_data *charger)
+{
+ unsigned int reg_data = 0;
+ int float_voltage;
+ struct regmap *regmap = charger->max77705->regmap_charger;
+
+ regmap_read(regmap, MAX77705_CHG_REG_CNFG_04, &reg_data);
+ reg_data &= 0x3F;
+ float_voltage = reg_data <= 0x04 ? reg_data * 50 + 4000 :
+ (reg_data - 4) * 10 + 4200;
+ dev_dbg(charger->dev, "battery cv reg : 0x%x, float voltage val : %d\n",
+ reg_data, float_voltage);
+
+ return float_voltage;
+}
+
+static void max77705_set_float_voltage(struct max77705_charger_data *charger,
+ int float_voltage)
+{
+ int float_voltage_mv;
+ unsigned int reg_data = 0;
+ struct regmap *regmap = charger->max77705->regmap_charger;
+
+ float_voltage_mv = float_voltage / 1000;
+ reg_data = float_voltage_mv <= 4000 ? 0x0 :
+ float_voltage_mv >= 4500 ? 0x23 :
+ (float_voltage_mv <= 4200) ? (float_voltage_mv - 4000) / 50 :
+ (((float_voltage_mv - 4200) / 10) + 0x04);
+
+ regmap_update_bits(regmap, MAX77705_CHG_REG_CNFG_04,
+ CHG_CNFG_04_CHG_CV_PRM_MASK,
+ (reg_data << CHG_CNFG_04_CHG_CV_PRM_SHIFT));
+
+ regmap_read(regmap, MAX77705_CHG_REG_CNFG_04, &reg_data);
+ dev_dbg(charger->dev, "battery cv voltage 0x%x\n", reg_data);
+}
+
+static bool max77705_check_battery(struct max77705_charger_data *charger)
+{
+ unsigned int reg_data;
+ unsigned int reg_data2;
+ struct regmap *regmap = charger->max77705->regmap_charger;
+
+
+ regmap_read(regmap, MAX77705_CHG_REG_INT_OK, &reg_data);
+
+ dev_dbg(charger->dev, "CHG_INT_OK(0x%x)\n", reg_data);
+
+ regmap_read(regmap,
+ MAX77705_CHG_REG_DETAILS_00, &reg_data2);
+
+ dev_dbg(charger->dev, "CHG_DETAILS00(0x%x)\n", reg_data2);
+
+ if ((reg_data & MAX77705_BATP_OK) || !(reg_data2 & MAX77705_BATP_DTLS))
+ return true;
+ else
+ return false;
+}
+
+static int max77705_get_charge_type(struct regmap *regmap,
+ union power_supply_propval *val)
+{
+ unsigned int reg_data;
+
+ regmap_read(regmap, MAX77705_CHG_REG_DETAILS_01, &reg_data);
+ reg_data &= 0x0F;
+ switch (reg_data) {
+ case MAX77705_CHARGER_CONSTANT_CURRENT:
+ val->strval = "CC Mode";
+ break;
+ case MAX77705_CHARGER_CONSTANT_VOLTAGE:
+ val->strval = "CV Mode";
+ break;
+ case MAX77705_CHARGER_END_OF_CHARGE:
+ val->strval = "EOC";
+ break;
+ case MAX77705_CHARGER_DONE:
+ val->strval = "DONE";
+ break;
+ default:
+ val->strval = "NONE";
+ break;
+ }
+
+ return 0;
+}
+
+static int max77705_get_charge_current(struct max77705_charger_data *charger)
+{
+ unsigned int reg_data;
+ int get_current = 0;
+ struct regmap *regmap = charger->max77705->regmap_charger;
+
+
+ regmap_read(regmap, MAX77705_CHG_REG_CNFG_02, &reg_data);
+ reg_data &= MAX77705_CHG_CC;
+
+ get_current = reg_data <= 0x2 ? 100 : reg_data * 50;
+
+ dev_dbg(charger->dev, "reg:(0x%x), charging_current:(%d)\n",
+ reg_data, get_current);
+ return get_current;
+}
+
+static void max77705_set_charge_current(struct max77705_charger_data *charger,
+ int fast_charging_current)
+{
+ int curr_step = 50;
+ u8 set_mask, reg_data = 0;
+ struct regmap *regmap = charger->max77705->regmap_charger;
+
+ set_mask = MAX77705_CHG_CC;
+
+ if (fast_charging_current < 100) {
+ regmap_update_bits(regmap, MAX77705_CHG_REG_CNFG_02, set_mask, 0x00);
+ } else {
+ fast_charging_current =
+ (fast_charging_current > 3150) ? 3150 : fast_charging_current;
+
+ reg_data |= (fast_charging_current / curr_step);
+ regmap_update_bits(regmap, MAX77705_CHG_REG_CNFG_02, set_mask, reg_data);
+ }
+
+ dev_dbg(charger->dev, "REG(0x%02x) DATA(0x%02x), CURRENT(%d)\n",
+ MAX77705_CHG_REG_CNFG_02,
+ reg_data, fast_charging_current);
+}
+
+static int max77705_chg_set_wdtmr_en(struct max77705_charger_data *charger, bool enable)
+{
+ dev_dbg(charger->dev, "WDT en = %d\n", enable);
+ struct regmap *regmap = charger->max77705->regmap_charger;
+
+ if (enable) {
+ regmap_update_bits(regmap, MAX77705_CHG_REG_CNFG_00,
+ CHG_CNFG_00_WDTEN_MASK, CHG_CNFG_00_WDTEN_MASK);
+ } else {
+ regmap_update_bits(regmap, MAX77705_CHG_REG_CNFG_00,
+ CHG_CNFG_00_WDTEN_MASK, 0);
+ }
+
+ return 0;
+}
+
+static void max77705_charger_initialize(struct max77705_charger_data *charger)
+{
+ u8 reg_data;
+ struct power_supply_battery_info *info;
+ struct regmap *regmap = charger->max77705->regmap_charger;
+
+ if (power_supply_get_battery_info(charger->psy_chg, &info) < 0)
+ return;
+
+ charger->bat_info = info;
+
+ /* unlock charger setting protect
+ * slowest LX slope
+ */
+ reg_data = MAX77705_CHGPROT_MASK | MAX77705_SLOWEST_LX_SLOPE;
+ regmap_update_bits(regmap, MAX77705_CHG_REG_CNFG_06, reg_data,
+ reg_data);
+
+ /*
+ * fast charge timer disable
+ * restart threshold disable
+ * pre-qual charge disable
+ */
+ reg_data = (MAX77705_FCHGTIME_DISABLE << CHG_CNFG_01_FCHGTIME_SHIFT) |
+ (MAX77705_CHG_RSTRT_DISABLE << CHG_CNFG_01_CHG_RSTRT_SHIFT) |
+ (MAX77705_CHG_PQEN_DISABLE << CHG_CNFG_01_PQEN_SHIFT);
+ regmap_update_bits(regmap, MAX77705_CHG_REG_CNFG_01,
+ (CHG_CNFG_01_FCHGTIME_MASK |
+ CHG_CNFG_01_CHG_RSTRT_MASK |
+ CHG_CNFG_01_PQEN_MASK),
+ reg_data);
+
+ /*
+ * OTG off(UNO on), boost off
+ */
+ regmap_update_bits(regmap, MAX77705_CHG_REG_CNFG_00,
+ CHG_CNFG_00_OTG_CTRL, 0);
+
+ /*
+ * charge current 450mA(default)
+ * otg current limit 900mA
+ */
+ regmap_update_bits(regmap, MAX77705_CHG_REG_CNFG_02,
+ CHG_CNFG_02_OTG_ILIM_MASK,
+ MAX77705_OTG_ILIM_900 << CHG_CNFG_02_OTG_ILIM_SHIFT);
+
+ /* BAT to SYS OCP 4.80A */
+ regmap_update_bits(regmap, MAX77705_CHG_REG_CNFG_05,
+ CHG_CNFG_05_REG_B2SOVRC_MASK,
+ MAX77705_B2SOVRC_4_8A << CHG_CNFG_05_REG_B2SOVRC_SHIFT);
+ /*
+ * top off current 150mA
+ * top off timer 30min
+ */
+ reg_data = (MAX77705_TO_ITH_150MA << CHG_CNFG_03_TO_ITH_SHIFT) |
+ (MAX77705_TO_TIME_30M << CHG_CNFG_03_TO_TIME_SHIFT) |
+ (MAX77705_SYS_TRACK_DISABLE << CHG_CNFG_03_SYS_TRACK_DIS_SHIFT);
+ regmap_update_bits(regmap, MAX77705_CHG_REG_CNFG_03,
+ (CHG_CNFG_03_TO_ITH_MASK |
+ CHG_CNFG_03_TO_TIME_MASK |
+ CHG_CNFG_03_SYS_TRACK_DIS_MASK), reg_data);
+
+ /*
+ * cv voltage 4.2V or 4.35V
+ * MINVSYS 3.6V(default)
+ */
+ if (info->voltage_max_design_uv < 0) {
+ dev_warn(charger->dev, "missing battery:voltage-max-design-microvolt\n");
+ max77705_set_float_voltage(charger, 4200000);
+ } else {
+ max77705_set_float_voltage(charger, info->voltage_max_design_uv);
+ }
+
+ /* VCHGIN : REG=4.5V, UVLO=4.7V, WCHGIN : REG=4.5V, UVLO=4.7V */
+ regmap_update_bits(regmap, MAX77705_CHG_REG_CNFG_12,
+ CHG_CNFG_12_VCHGIN_REG_MASK | CHG_CNFG_12_WCIN_REG_MASK, 0);
+
+ /* Boost mode possible in FACTORY MODE */
+ regmap_update_bits(regmap, MAX77705_CHG_REG_CNFG_07,
+ CHG_CNFG_07_REG_FMBST_MASK, MAX77705_CHG_FMBST);
+
+ /* Watchdog timer */
+ max77705_chg_set_wdtmr_en(charger, 0);
+
+ /* Active Discharge Enable */
+ regmap_update_bits(regmap, MAX77705_PMIC_REG_MAINCTRL1, 1, 1);
+
+ regmap_update_bits(regmap, MAX77705_CHG_REG_CNFG_09, MAX77705_CHG_EN, MAX77705_CHG_EN);
+
+ /* VBYPSET=5.0V */
+ regmap_update_bits(regmap, MAX77705_CHG_REG_CNFG_11, CHG_CNFG_11_VBYPSET_MASK, 0);
+
+ /* Switching Frequency : 1.5MHz */
+ regmap_update_bits(regmap, MAX77705_CHG_REG_CNFG_08, CHG_CNFG_08_REG_FSW_MASK,
+ (MAX77705_CHG_FSW_1_5MHz << CHG_CNFG_08_REG_FSW_SHIFT));
+
+ /* Auto skip mode */
+ regmap_update_bits(regmap, MAX77705_CHG_REG_CNFG_12, CHG_CNFG_12_REG_DISKIP_MASK,
+ (MAX77705_AUTO_SKIP << CHG_CNFG_12_REG_DISKIP_SHIFT));
+}
+
+static bool max77705_charger_unlock(struct max77705_charger_data *charger)
+{
+ unsigned int reg_data;
+ unsigned int chgprot;
+ int retry_cnt = 0;
+ bool need_init = false;
+ struct regmap *regmap = charger->max77705->regmap_charger;
+
+ do {
+ regmap_read(regmap, MAX77705_CHG_REG_CNFG_06,
+ &reg_data);
+ chgprot = (reg_data & MAX77705_CHGPROT_MASK);
+ if (chgprot != MAX77705_CHGPROT_UNLOCKED) {
+ dev_err(charger->dev, "unlock err, chgprot(0x%x), retry(%d)\n",
+ chgprot, retry_cnt);
+ regmap_update_bits(regmap, MAX77705_CHG_REG_CNFG_06,
+ MAX77705_CHGPROT_MASK, MAX77705_CHGPROT_MASK);
+ need_init = true;
+ msleep(20);
+ } else
+ break;
+ } while ((chgprot != MAX77705_CHGPROT_UNLOCKED) && (++retry_cnt < 10));
+
+ return need_init;
+}
+
+static int max77705_prop_writeable(struct power_supply *psy,
+ enum power_supply_property psp)
+{
+ return (psp == POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT) ||
+ (psp == POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN) ||
+ (psp == POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT) ||
+ (psp == POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE);
+}
+
+static int max77705_chg_set_property(struct power_supply *psy,
+ enum power_supply_property psp,
+ const union power_supply_propval *val)
+{
+ struct max77705_charger_data *charger = power_supply_get_drvdata(psy);
+
+ /* check unlock status before does set the register */
+ max77705_charger_unlock(charger);
+ switch (psp) {
+ case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
+ max77705_set_input_current(charger, val->intval);
+ break;
+ case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
+ max77705_set_charge_current(charger, val->intval);
+ break;
+ case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
+ if (val->intval > charger->bat_info->voltage_max_design_uv) {
+ dev_err(charger->dev, "%d voltage higher than max",
+ val->intval);
+ return -EINVAL;
+ }
+ max77705_set_float_voltage(charger, val->intval);
+ break;
+ default:
+ return -EINVAL;
+ }
+ return 0;
+}
+
+static int max77705_chg_get_property(struct power_supply *psy,
+ enum power_supply_property psp,
+ union power_supply_propval *val)
+{
+ int ret = 0;
+ struct max77705_charger_data *charger = power_supply_get_drvdata(psy);
+ struct regmap *regmap = charger->max77705->regmap_charger;
+
+ switch (psp) {
+ case POWER_SUPPLY_PROP_ONLINE:
+ max77705_get_online(regmap, &val->intval);
+ break;
+ case POWER_SUPPLY_PROP_PRESENT:
+ val->intval = max77705_check_battery(charger);
+ break;
+ case POWER_SUPPLY_PROP_STATUS:
+ val->intval = max77705_get_charger_state(charger);
+ break;
+ case POWER_SUPPLY_PROP_HEALTH:
+ ret = max77705_get_health(regmap, &val->intval);
+ break;
+ case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
+ val->intval = max77705_get_input_current(charger);
+ break;
+ case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
+ val->intval = max77705_get_charge_current(charger);
+ break;
+ case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
+ val->intval = max77705_get_float_voltage(charger);
+ break;
+ case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
+ val->intval = charger->bat_info->voltage_max_design_uv;
+ break;
+ case POWER_SUPPLY_PROP_CHARGE_TYPE:
+ ret = max77705_get_charge_type(regmap, val);
+ break;
+ case POWER_SUPPLY_PROP_MODEL_NAME:
+ val->strval = max77705_charger_model;
+ break;
+ case POWER_SUPPLY_PROP_MANUFACTURER:
+ val->strval = max77705_charger_manufacturer;
+ break;
+ default:
+ return -EINVAL;
+ }
+ return ret;
+}
+
+static void max77705_chgin_isr_work(struct work_struct *work)
+{
+ struct max77705_charger_data *charger =
+ container_of(work, struct max77705_charger_data, chgin_work);
+ regmap_update_bits(charger->max77705->regmap_charger,
+ MAX77705_CHG_REG_INT_MASK,
+ MAX77705_CHGIN_IM, MAX77705_CHGIN_IM);
+ power_supply_changed(charger->psy_chg);
+ regmap_update_bits(charger->max77705->regmap_charger,
+ MAX77705_CHG_REG_INT_MASK,
+ MAX77705_CHGIN_IM, 0);
+}
+
+static irqreturn_t max77705_chgin_irq(int irq, void *data)
+{
+ struct max77705_charger_data *charger = data;
+
+ queue_work(charger->wqueue, &charger->chgin_work);
+
+ return IRQ_HANDLED;
+}
+
+static int max77705_debugfs_show(struct seq_file *s, void *data)
+{
+ struct max77705_charger_data *charger = s->private;
+ struct regmap *regmap = charger->max77705->regmap_charger;
+ unsigned int reg, reg_data;
+
+ seq_printf(s, "MAX77705 CHARGER IC, ver.0x%x\n", charger->pmic_ver);
+ seq_puts(s, "===================\n");
+ for (reg = 0xB0; reg <= 0xC3; reg++) {
+ regmap_read(regmap, reg, &reg_data);
+ seq_printf(s, "0x%02x:\t0x%02x\n", reg, reg_data);
+ }
+
+ seq_puts(s, "\n");
+ return 0;
+}
+
+static int max77705_debugfs_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, max77705_debugfs_show, inode->i_private);
+}
+
+static const struct file_operations max77705_debugfs_fops = {
+ .open = max77705_debugfs_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+};
+
+static const struct power_supply_desc max77705_charger_power_supply_desc = {
+ .name = MAX77705_CHARGER_NAME,
+ .type = POWER_SUPPLY_TYPE_BATTERY,
+ .properties = max77705_charger_props,
+ .num_properties = ARRAY_SIZE(max77705_charger_props),
+ .get_property = max77705_chg_get_property,
+ .set_property = max77705_chg_set_property,
+ .property_is_writeable = max77705_prop_writeable,
+};
+
+static int max77705_charger_probe(struct platform_device *pdev)
+{
+ struct max77705_dev *max77705 = dev_get_drvdata(pdev->dev.parent);
+ struct max77705_platform_data *pdata = dev_get_platdata(max77705->dev);
+ struct max77705_charger_data *charger;
+ struct regmap *regmap = max77705->regmap_charger;
+ struct power_supply_config charger_cfg = { };
+ int ret = 0;
+ unsigned int reg_data;
+
+ charger = kzalloc(sizeof(*charger), GFP_KERNEL);
+ if (!charger)
+ return -ENOMEM;
+
+ mutex_init(&charger->charger_mutex);
+
+ charger->dev = &pdev->dev;
+ charger->max77705 = max77705;
+ charger->max77705_pdata = pdata;
+
+ platform_set_drvdata(pdev, charger);
+
+ regmap_read(regmap, MAX77705_CHG_REG_INT_OK, &reg_data);
+
+ if (regmap_read
+ (max77705->regmap, MAX77705_PMIC_REG_PMICREV, &reg_data) < 0) {
+ dev_err(charger->dev,
+ "device not found on this channel (this is not an error)\n");
+ ret = -ENOMEM;
+ } else {
+ charger->pmic_ver = (reg_data & 0x7);
+ dev_dbg(charger->dev, "device found : ver.0x%x\n", charger->pmic_ver);
+ }
+
+ debugfs_file = debugfs_create_file("max77705-charger-regs",
+ 0664, NULL, (void *)charger,
+ &max77705_debugfs_fops);
+ if (!debugfs_file)
+ dev_err(charger->dev, "Failed to create debugfs file\n");
+
+ charger_cfg.drv_data = charger;
+ charger_cfg.of_node = charger->dev->of_node;
+
+ charger->psy_chg =
+ devm_power_supply_register(&pdev->dev,
+ &max77705_charger_power_supply_desc,
+ &charger_cfg);
+ if (IS_ERR(charger->psy_chg)) {
+ dev_err(charger->dev, "Failed to Register psy_chg\n");
+ goto err_free;
+ }
+
+ max77705_charger_initialize(charger);
+
+ charger->wqueue = create_singlethread_workqueue(dev_name(&pdev->dev));
+ if (!charger->wqueue) {
+ pr_err("%s: Fail to Create Workqueue\n", __func__);
+ goto err_free;
+ }
+ INIT_WORK(&charger->chgin_work, max77705_chgin_isr_work);
+
+ charger->irq_chgin = max77705->irq_base + MAX77705_CHG_IRQ_CHGIN_I;
+ ret = devm_request_threaded_irq(charger->dev, charger->irq_chgin, NULL,
+ max77705_chgin_irq, 0, "chgin-irq", charger);
+ if (ret < 0) {
+ pr_err("%s: fail to request chgin IRQ: %d: %d\n",
+ __func__, charger->irq_chgin, ret);
+ } else {
+ max77705_irq_unmask_subdevice(max77705, MAX77705_IRQSRC_CHG);
+ }
+
+ return 0;
+
+err_free:
+ kfree(charger);
+
+ return ret;
+}
+
+static void max77705_charger_remove(struct platform_device *pdev)
+{
+ struct max77705_charger_data *charger = platform_get_drvdata(pdev);
+ struct regmap *regmap = charger->max77705->regmap_charger;
+
+ max77705_irq_mask_subdevice(charger->max77705, MAX77705_IRQSRC_CHG);
+
+ if (regmap) {
+ u8 reg_data;
+
+ reg_data = CHG_CNFG_00_BUCK_MASK;
+ regmap_write(regmap, MAX77705_CHG_REG_CNFG_00, reg_data);
+ reg_data = max77705_convert_ma_to_chgin_ilim_value(500);
+ regmap_write(regmap, MAX77705_CHG_REG_CNFG_09, reg_data);
+ reg_data = max77705_convert_ma_to_wcin_ilim_value(320);
+ regmap_write(regmap, MAX77705_CHG_REG_CNFG_10, reg_data);
+ reg_data = CHG_CNFG_12_CHGINSEL_MASK | CHG_CNFG_12_WCINSEL_MASK;
+ regmap_write(regmap, MAX77705_CHG_REG_CNFG_12, reg_data);
+ } else {
+ dev_err(charger->dev, "no max77705 i2c client\n");
+ }
+
+ if (debugfs_file)
+ debugfs_remove(debugfs_file);
+
+ kfree(charger);
+}
+
+static const struct platform_device_id max77705_charger_id[] = {
+ { "max77705-charger", 0, },
+ { }
+};
+MODULE_DEVICE_TABLE(platform, max77705_charger_id);
+
+static struct platform_driver max77705_charger_driver = {
+ .driver = {
+ .name = "max77705-charger",
+ },
+ .probe = max77705_charger_probe,
+ .remove_new = max77705_charger_remove,
+ .id_table = max77705_charger_id,
+};
+module_platform_driver(max77705_charger_driver);
+
+MODULE_AUTHOR("Dzmitry Sankouski <dsankouski@gmail.com>");
+MODULE_DESCRIPTION("Maxim 77705 charger driver");
+MODULE_LICENSE("GPL");
diff --git a/include/linux/mfd/max77705_charger.h b/include/linux/mfd/max77705_charger.h
new file mode 100644
index 000000000000..816bb63d9583
--- /dev/null
+++ b/include/linux/mfd/max77705_charger.h
@@ -0,0 +1,225 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * max77705_charger.h
+ * Samsung max77705 Charger Header
+ *
+ * Copyright (C) 2015 Samsung Electronics, Inc.
+ *
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * 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.
+ *
+ */
+
+#ifndef __MAX77705_CHARGER_H
+#define __MAX77705_CHARGER_H __FILE__
+
+#include <linux/mfd/core.h>
+#include <linux/mfd/max77705.h>
+#include <linux/mfd/max77705-private.h>
+#include <linux/regulator/machine.h>
+
+/* MAX77705_CHG_REG_CHG_INT */
+#define MAX77705_BYP_I BIT(0)
+#define MAX77705_INP_LIMIT_I BIT(1)
+#define MAX77705_BATP_I BIT(2)
+#define MAX77705_BAT_I BIT(3)
+#define MAX77705_CHG_I BIT(4)
+#define MAX77705_WCIN_I BIT(5)
+#define MAX77705_CHGIN_I BIT(6)
+#define MAX77705_AICL_I BIT(7)
+
+/* MAX77705_CHG_REG_CHG_INT_MASK */
+#define MAX77705_BYP_IM BIT(0)
+#define MAX77705_INP_LIMIT_IM BIT(1)
+#define MAX77705_BATP_IM BIT(2)
+#define MAX77705_BAT_IM BIT(3)
+#define MAX77705_CHG_IM BIT(4)
+#define MAX77705_WCIN_IM BIT(5)
+#define MAX77705_CHGIN_IM BIT(6)
+#define MAX77705_AICL_IM BIT(7)
+
+/* MAX77705_CHG_REG_CHG_INT_OK */
+#define MAX77705_BYP_OK BIT(0)
+#define MAX77705_DISQBAT_OK BIT(1)
+#define MAX77705_BATP_OK BIT(2)
+#define MAX77705_BAT_OK BIT(3)
+#define MAX77705_CHG_OK BIT(4)
+#define MAX77705_WCIN_OK BIT(5)
+#define MAX77705_CHGIN_OK BIT(6)
+#define MAX77705_AICL_OK BIT(7)
+
+/* MAX77705_CHG_REG_CHG_DTLS_00 */
+#define MAX77705_BATP_DTLS BIT(0)
+#define MAX77705_WCIN_DTLS (BIT(3) | BIT(4))
+#define MAX77705_WCIN_DTLS_SHIFT 3
+#define MAX77705_CHGIN_DTLS (BIT(5) | BIT(6))
+#define MAX77705_CHGIN_DTLS_SHIFT 5
+
+/* MAX77705_CHG_REG_CHG_DTLS_01 */
+#define MAX77705_CHG_DTLS (BIT(0) | BIT(1) | BIT(2) | BIT(3))
+#define MAX77705_CHG_DTLS_SHIFT 0
+#define MAX77705_BAT_DTLS (BIT(4) | BIT(5) | BIT(6))
+#define MAX77705_BAT_DTLS_SHIFT 4
+
+/* MAX77705_CHG_REG_CHG_DTLS_02 */
+#define MAX77705_BYP_DTLS (BIT(0) | BIT(1) | BIT(2) | BIT(3))
+#define MAX77705_BYP_DTLS_SHIFT 0
+
+/* MAX77705_CHG_REG_CHG_CNFG_00 */
+#define CHG_CNFG_00_MODE_SHIFT 0
+#define CHG_CNFG_00_CHG_SHIFT 0
+#define CHG_CNFG_00_UNO_SHIFT 1
+#define CHG_CNFG_00_OTG_SHIFT 1
+#define CHG_CNFG_00_BUCK_SHIFT 2
+#define CHG_CNFG_00_BOOST_SHIFT 3
+#define CHG_CNFG_00_WDTEN_SHIFT 4
+#define CHG_CNFG_00_MODE_MASK (0x0F << CHG_CNFG_00_MODE_SHIFT)
+#define CHG_CNFG_00_CHG_MASK BIT(CHG_CNFG_00_CHG_SHIFT)
+#define CHG_CNFG_00_UNO_MASK BIT(CHG_CNFG_00_UNO_SHIFT)
+#define CHG_CNFG_00_OTG_MASK BIT(CHG_CNFG_00_OTG_SHIFT)
+#define CHG_CNFG_00_BUCK_MASK BIT(CHG_CNFG_00_BUCK_SHIFT)
+#define CHG_CNFG_00_BOOST_MASK BIT(CHG_CNFG_00_BOOST_SHIFT)
+#define CHG_CNFG_00_WDTEN_MASK BIT(CHG_CNFG_00_WDTEN_SHIFT)
+#define CHG_CNFG_00_UNO_CTRL (CHG_CNFG_00_UNO_MASK | CHG_CNFG_00_BOOST_MASK)
+#define CHG_CNFG_00_OTG_CTRL (CHG_CNFG_00_OTG_MASK | CHG_CNFG_00_BOOST_MASK)
+
+/* MAX77705_CHG_REG_CHG_CNFG_01 */
+#define CHG_CNFG_01_FCHGTIME_SHIFT 0
+#define CHG_CNFG_01_FCHGTIME_MASK (0x7 << CHG_CNFG_01_FCHGTIME_SHIFT)
+#define MAX77705_FCHGTIME_DISABLE 0x0
+
+#define CHG_CNFG_01_CHG_RSTRT_SHIFT 4
+#define CHG_CNFG_01_CHG_RSTRT_MASK (0x3 << CHG_CNFG_01_CHG_RSTRT_SHIFT)
+#define MAX77705_CHG_RSTRT_DISABLE 0x3
+
+#define CHG_CNFG_01_PQEN_SHIFT 7
+#define CHG_CNFG_01_PQEN_MASK (0x1 << CHG_CNFG_01_PQEN_SHIFT)
+#define MAX77705_CHG_PQEN_DISABLE 0x0
+#define MAX77705_CHG_PQEN_ENABLE 0x1
+
+/* MAX77705_CHG_REG_CHG_CNFG_02 */
+#define CHG_CNFG_02_OTG_ILIM_SHIFT 6
+#define CHG_CNFG_02_OTG_ILIM_MASK (0x3 << CHG_CNFG_02_OTG_ILIM_SHIFT)
+#define MAX77705_OTG_ILIM_500 0x0
+#define MAX77705_OTG_ILIM_900 0x1
+#define MAX77705_OTG_ILIM_1200 0x2
+#define MAX77705_OTG_ILIM_1500 0x3
+#define MAX77705_CHG_CC 0x3F
+
+/* MAX77705_CHG_REG_CHG_CNFG_03 */
+#define CHG_CNFG_03_TO_ITH_SHIFT 0
+#define CHG_CNFG_03_TO_ITH_MASK (0x7 << CHG_CNFG_03_TO_ITH_SHIFT)
+#define MAX77705_TO_ITH_150MA 0x0
+
+#define CHG_CNFG_03_TO_TIME_SHIFT 3
+#define CHG_CNFG_03_TO_TIME_MASK (0x7 << CHG_CNFG_03_TO_TIME_SHIFT)
+#define MAX77705_TO_TIME_30M 0x3
+
+#define CHG_CNFG_03_SYS_TRACK_DIS_SHIFT 7
+#define CHG_CNFG_03_SYS_TRACK_DIS_MASK (0x1 << CHG_CNFG_03_SYS_TRACK_DIS_SHIFT)
+#define MAX77705_SYS_TRACK_ENABLE 0x0
+#define MAX77705_SYS_TRACK_DISABLE 0x1
+
+/* MAX77705_CHG_REG_CHG_CNFG_04 */
+#define MAX77705_CHG_MINVSYS_MASK 0xC0
+#define MAX77705_CHG_MINVSYS_SHIFT 6
+#define MAX77705_CHG_PRM_MASK 0x1F
+#define MAX77705_CHG_PRM_SHIFT 0
+
+#define CHG_CNFG_04_CHG_CV_PRM_SHIFT 0
+#define CHG_CNFG_04_CHG_CV_PRM_MASK (0x3F << CHG_CNFG_04_CHG_CV_PRM_SHIFT)
+
+/* MAX77705_CHG_REG_CHG_CNFG_05 */
+#define CHG_CNFG_05_REG_B2SOVRC_SHIFT 0
+#define CHG_CNFG_05_REG_B2SOVRC_MASK (0xF << CHG_CNFG_05_REG_B2SOVRC_SHIFT)
+#define MAX77705_B2SOVRC_DISABLE 0x0
+#define MAX77705_B2SOVRC_4_5A 0x6
+#define MAX77705_B2SOVRC_4_8A 0x8
+#define MAX77705_B2SOVRC_5_0A 0x9
+
+/* MAX77705_CHG_CNFG_06 */
+#define CHG_CNFG_01_WDTCLR_SHIFT 0
+#define CHG_CNFG_01_WDTCLR_MASK (0x3 << CHG_CNFG_01_WDTCLR_SHIFT)
+#define MAX77705_WDTCLR 0x01
+#define MAX77705_CHGPROT_MASK (BIT(2) | BIT(3))
+#define MAX77705_CHGPROT_UNLOCKED (BIT(2) | BIT(3))
+#define MAX77705_SLOWEST_LX_SLOPE (BIT(5) | BIT(6))
+
+/* MAX77705_CHG_REG_CHG_CNFG_07 */
+#define MAX77705_CHG_FMBST 0x04
+#define CHG_CNFG_07_REG_FMBST_SHIFT 2
+#define CHG_CNFG_07_REG_FMBST_MASK (0x1 << CHG_CNFG_07_REG_FMBST_SHIFT)
+#define CHG_CNFG_07_REG_FGSRC_SHIFT 1
+#define CHG_CNFG_07_REG_FGSRC_MASK (0x1 << CHG_CNFG_07_REG_FGSRC_SHIFT)
+
+/* MAX77705_CHG_REG_CHG_CNFG_08 */
+#define CHG_CNFG_08_REG_FSW_SHIFT 0
+#define CHG_CNFG_08_REG_FSW_MASK (0x3 << CHG_CNFG_08_REG_FSW_SHIFT)
+#define MAX77705_CHG_FSW_3MHz 0x00
+#define MAX77705_CHG_FSW_2MHz 0x01
+#define MAX77705_CHG_FSW_1_5MHz 0x02
+
+/* MAX77705_CHG_REG_CHG_CNFG_09 */
+#define MAX77705_CHG_CHGIN_LIM_MASK 0x7F
+#define MAX77705_CHG_EN 0x80
+
+/* MAX77705_CHG_REG_CHG_CNFG_10 */
+#define MAX77705_CHG_WCIN_LIM 0x3F
+
+/* MAX77705_CHG_REG_CHG_CNFG_11 */
+#define CHG_CNFG_11_VBYPSET_SHIFT 0
+#define CHG_CNFG_11_VBYPSET_MASK (0x7F << CHG_CNFG_11_VBYPSET_SHIFT)
+
+/* MAX77705_CHG_REG_CHG_CNFG_12 */
+#define CHG_CNFG_12_CHGINSEL_SHIFT 5
+#define MAX77705_CHG_WCINSEL BIT(CHG_CNFG_12_CHGINSEL_SHIFT)
+#define CHG_CNFG_12_CHGINSEL_MASK BIT(CHG_CNFG_12_CHGINSEL_SHIFT)
+#define CHG_CNFG_12_WCINSEL_SHIFT 6
+#define CHG_CNFG_12_WCINSEL_MASK BIT(CHG_CNFG_12_WCINSEL_SHIFT)
+#define CHG_CNFG_12_VCHGIN_REG_MASK (0x3 << 3)
+#define CHG_CNFG_12_WCIN_REG_MASK (0x3 << 1)
+#define CHG_CNFG_12_REG_DISKIP_SHIFT 0
+#define CHG_CNFG_12_REG_DISKIP_MASK (0x1 << CHG_CNFG_12_REG_DISKIP_SHIFT)
+#define MAX77705_DISABLE_SKIP 0x1
+#define MAX77705_AUTO_SKIP 0x0
+
+/* Convert current in mA to corresponding CNFG09 value */
+inline u8 max77705_convert_ma_to_chgin_ilim_value(int cur)
+{
+ if (unlikely(cur < 0 && cur > 4000))
+ return 0;
+ return (((cur - 100) / 33) + 3);
+}
+
+/* Convert current in mA to corresponding CNFG10 value */
+inline u8 max77705_convert_ma_to_wcin_ilim_value(int cur)
+{
+ if (unlikely(cur < 0 && cur > 4000))
+ return 0;
+ return (((cur - 60) / 20) + 3);
+}
+
+struct max77705_charger_data {
+ struct device *dev;
+ struct mutex charger_mutex;
+
+ struct max77705_platform_data *max77705_pdata;
+ struct max77705_dev *max77705;
+ struct power_supply_battery_info *bat_info;
+ struct workqueue_struct *wqueue;
+ struct work_struct chgin_work;
+ int irq_chgin;
+
+ struct power_supply *psy_chg;
+
+ int pmic_ver;
+};
+
+#endif /* __MAX77705_CHARGER_H */

--
2.39.2