Hi Bhavin,
A small nit
> Adds initial support for the STC3117 fuel gauge.
>
> The driver provides functionality to monitor key parameters including:
> - Voltage
> - Current
> - State of Charge (SOC)
> - Temperature
> - Status
>
> Signed-off-by: Hardevsinh Palaniya <hardevsinh.palaniya@xxxxxxxxxxxxxxxxx>
> Signed-off-by: Bhavin Sharma <bhavin.sharma@xxxxxxxxxxxxxxxxx>
[...]
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * stc3117_fuel_gauge.c - STMicroelectronics STC3117 Fuel Gauge Driver
> + *
> + * Copyright (c) 2024 Silicon Signals Pvt Ltd.
> + * Author: Hardevsinh Palaniya <hardevsinh.palaniya@xxxxxxxxxxxxxxxxxx>
Domain name should be "siliconsignals.io" in author.
Hardevsinh Palaniya <hardevsinh.palaniya@xxxxxxxxxxxxxxxxx>
Otherwise looks good
Thanks
Hardev
________________________________________
From: Bhavin Sharma <bhavin.sharma@xxxxxxxxxxxxxxxxx>
Sent: Monday, December 2, 2024 3:11 PM
To: sre@xxxxxxxxxx <sre@xxxxxxxxxx>; christophe.jaillet@xxxxxxxxxx <christophe.jaillet@xxxxxxxxxx>
Cc: Bhavin Sharma <bhavin.sharma@xxxxxxxxxxxxxxxxx>; Hardevsinh Palaniya <hardevsinh.palaniya@xxxxxxxxxxxxxxxxx>; Rob Herring <robh@xxxxxxxxxx>; Krzysztof Kozlowski <krzk+dt@xxxxxxxxxx>; Conor Dooley <conor+dt@xxxxxxxxxx>; linux-pm@xxxxxxxxxxxxxxx <linux-pm@xxxxxxxxxxxxxxx>; devicetree@xxxxxxxxxxxxxxx <devicetree@xxxxxxxxxxxxxxx>; linux-kernel@xxxxxxxxxxxxxxx <linux-kernel@xxxxxxxxxxxxxxx>
Subject: [PATCH v7 2/2] power: supply: Add STC3117 fuel gauge unit driver
Adds initial support for the STC3117 fuel gauge.
The driver provides functionality to monitor key parameters including:
- Voltage
- Current
- State of Charge (SOC)
- Temperature
- Status
Signed-off-by: Hardevsinh Palaniya <hardevsinh.palaniya@xxxxxxxxxxxxxxxxx>
Signed-off-by: Bhavin Sharma <bhavin.sharma@xxxxxxxxxxxxxxxxx>
---
MAINTAINERS | 8 +
drivers/power/supply/Kconfig | 7 +
drivers/power/supply/Makefile | 1 +
drivers/power/supply/stc3117_fuel_gauge.c | 665 ++++++++++++++++++++++
4 files changed, 681 insertions(+)
create mode 100644 drivers/power/supply/stc3117_fuel_gauge.c
diff --git a/MAINTAINERS b/MAINTAINERS
index c1fcc56bf2fb..10ead03660d5 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -22125,6 +22125,14 @@ T: git git://linuxtv.org/media.git
F: Documentation/devicetree/bindings/media/i2c/st,st-mipid02.yaml
F: drivers/media/i2c/st-mipid02.c
+ST STC3117 FUEL GAUGE DRIVER
+M: Hardevsinh Palaniya <hardevsinh.palaniya@xxxxxxxxxxxxxxxxx>
+M: Bhavin Sharma <bhavin.sharma@xxxxxxxxxxxxxxxxx>
+L: linux-pm@xxxxxxxxxxxxxxx
+S: Maintained
+F: Documentation/devicetree/bindings/power/supply/st,stc3117.yaml
+F: drivers/power/supply/stc3117_fuel_gauge.c
+
ST STM32 FIREWALL
M: Gatien Chevallier <gatien.chevallier@xxxxxxxxxxx>
S: Maintained
diff --git a/drivers/power/supply/Kconfig b/drivers/power/supply/Kconfig
index 9f2eef6787f7..9f34a2a6bc00 100644
--- a/drivers/power/supply/Kconfig
+++ b/drivers/power/supply/Kconfig
@@ -918,6 +918,13 @@ config FUEL_GAUGE_SC27XX
Say Y here to enable support for fuel gauge with SC27XX
PMIC chips.
+config FUEL_GAUGE_STC3117
+ tristate "STMicroelectronics STC3117 fuel gauge driver"
+ depends on I2C
+ help
+ Say Y here to enable support for fuel gauge with STC3117
+ chip.
+
config CHARGER_UCS1002
tristate "Microchip UCS1002 USB Port Power Controller"
depends on I2C
diff --git a/drivers/power/supply/Makefile b/drivers/power/supply/Makefile
index 59c4a9f40d28..b55cc48a4c86 100644
--- a/drivers/power/supply/Makefile
+++ b/drivers/power/supply/Makefile
@@ -108,6 +108,7 @@ obj-$(CONFIG_CHARGER_CROS_USBPD) += cros_usbpd-charger.o
obj-$(CONFIG_CHARGER_CROS_PCHG) += cros_peripheral_charger.o
obj-$(CONFIG_CHARGER_SC2731) += sc2731_charger.o
obj-$(CONFIG_FUEL_GAUGE_SC27XX) += sc27xx_fuel_gauge.o
+obj-$(CONFIG_FUEL_GAUGE_STC3117) += stc3117_fuel_gauge.o
obj-$(CONFIG_CHARGER_UCS1002) += ucs1002_power.o
obj-$(CONFIG_CHARGER_BD99954) += bd99954-charger.o
obj-$(CONFIG_CHARGER_WILCO) += wilco-charger.o
diff --git a/drivers/power/supply/stc3117_fuel_gauge.c b/drivers/power/supply/stc3117_fuel_gauge.c
new file mode 100644
index 000000000000..ffa7e0d35474
--- /dev/null
+++ b/drivers/power/supply/stc3117_fuel_gauge.c
@@ -0,0 +1,665 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * stc3117_fuel_gauge.c - STMicroelectronics STC3117 Fuel Gauge Driver
+ *
+ * Copyright (c) 2024 Silicon Signals Pvt Ltd.
+ * Author: Hardevsinh Palaniya <hardevsinh.palaniya@xxxxxxxxxxxxxxxxxx>
+ * Bhavin Sharma <bhavin.sharma@xxxxxxxxxxxxxxxxx>
+ */
+
+#include <linux/i2c.h>
+#include <linux/workqueue.h>
+#include <linux/power_supply.h>
+#include <linux/regmap.h>
+#include <linux/crc8.h>
+
+#define STC3117_ADDR_MODE 0x00
+#define STC3117_ADDR_CTRL 0x01
+#define STC3117_ADDR_SOC_L 0x02
+#define STC3117_ADDR_SOC_H 0x03
+#define STC3117_ADDR_COUNTER_L 0x04
+#define STC3117_ADDR_COUNTER_H 0x05
+#define STC3117_ADDR_CURRENT_L 0x06
+#define STC3117_ADDR_CURRENT_H 0x07
+#define STC3117_ADDR_VOLTAGE_L 0x08
+#define STC3117_ADDR_VOLTAGE_H 0x09
+#define STC3117_ADDR_TEMPERATURE 0x0A
+#define STC3117_ADDR_AVG_CURRENT_L 0X0B
+#define STC3117_ADDR_AVG_CURRENT_H 0X0C
+#define STC3117_ADDR_OCV_L 0X0D
+#define STC3117_ADDR_OCV_H 0X0E
+#define STC3117_ADDR_CC_CNF_L 0X0F
+#define STC3117_ADDR_CC_CNF_H 0X10
+#define STC3117_ADDR_VM_CNF_L 0X11
+#define STC3117_ADDR_VM_CNF_H 0X12
+#define STC3117_ADDR_ALARM_soc 0X13
+#define STC3117_ADDR_ALARM_VOLTAGE 0X14
+#define STC3117_ADDR_ID 0X18
+#define STC3117_ADDR_CC_ADJ_L 0X1B
+#define STC3117_ADDR_CC_ADJ_H 0X1C
+#define STC3117_ADDR_VM_ADJ_L 0X1D
+#define STC3117_ADDR_VM_ADJ_H 0X1E
+#define STC3117_ADDR_RAM 0x20
+#define STC3117_ADDR_OCV_TABLE 0x30
+#define STC3117_ADDR_SOC_TABLE 0x30
+
+/* Bit mask definition */
+#define STC3117_ID 0x16
+#define STC3117_MIXED_MODE 0x00
+#define STC3117_VMODE BIT(0)
+#define STC3117_GG_RUN BIT(4)
+#define STC3117_CC_MODE BIT(5)
+#define STC3117_BATFAIL BIT(3)
+#define STC3117_PORDET BIT(4)
+#define STC3117_RAM_SIZE 16
+#define STC3117_OCV_TABLE_SIZE 16
+#define STC3117_RAM_TESTWORD 0x53A9
+#define STC3117_SOFT_RESET 0x11
+#define STC3117_NOMINAL_CAPACITY 2600
+
+#define VOLTAGE_LSB_VALUE 9011
+#define CURRENT_LSB_VALUE 24084
+#define APP_CUTOFF_VOLTAGE 2500
+#define MAX_HRSOC 51200
+#define MAX_SOC 1000
+#define CHG_MIN_CURRENT 200
+#define CHG_END_CURRENT 20
+#define APP_MIN_CURRENT (-5)
+#define BATTERY_FULL 95
+#define CRC8_POLYNOMIAL 0x07
+#define CRC8_INIT 0x00
+
+DECLARE_CRC8_TABLE(stc3117_crc_table);
+
+enum stc3117_state {
+ STC3117_INIT,
+ STC3117_RUNNING,
+ STC3117_POWERDN,
+};
+
+enum stc3117_status {
+ BATT_LOWBATT = -2,
+ BATT_DISCHARG,
+ BATT_IDLE,
+ BATT_FULCHARG,
+ BATT_ENDCHARG,
+ BATT_CHARGING,
+};
+
+/* Default ocv curve Li-ion battery */
+static const int ocv_value[16] = {
+ 3400, 3582, 3669, 3676, 3699, 3737, 3757, 3774,
+ 3804, 3844, 3936, 3984, 4028, 4131, 4246, 4320
+};
+
+static union stc3117_internal_ram {
+ u8 ram_bytes[STC3117_RAM_SIZE];
+ struct {
+ u16 testword; /* 0-1 Bytes */
+ u16 hrsoc; /* 2-3 Bytes */
+ u16 cc_cnf; /* 4-5 Bytes */
+ u16 vm_cnf; /* 6-7 Bytes */
+ u8 soc; /* 8 Byte */
+ u8 state; /* 9 Byte */
+ u8 unused[5]; /* 10-14 Bytes */
+ u8 crc; /* 15 Byte */
+ } reg;
+} ram_data;
+
+struct stc3117_data {
+ struct i2c_client *client;
+ struct regmap *regmap;
+ struct delayed_work update_work;
+ struct power_supply *battery;
+
+ u8 soc_tab[16];
+ int cc_cnf;
+ int vm_cnf;
+ int cc_adj;
+ int vm_adj;
+ int avg_current;
+ int avg_voltage;
+ int batt_current;
+ int voltage;
+ int temp;
+ int soc;
+ int ocv;
+ int hrsoc;
+ int presence;
+ int battery_state;
+};
+
+struct stc3117_battery_info {
+ int voltage_min_mv;
+ int voltage_max_mv;
+ int battery_capacity_mah;
+ int sense_resistor;
+} battery_info;
+
+static int stc3117_convert(int value, int factor)
+{
+ value = (value * factor) / 4096;
+ return value;
+}
+
+static int stc3117_get_battery_data(struct stc3117_data *data)
+{
+ u8 reg_list[16];
+ u8 data_adjust[4];
+ int value, mode;
+
+ regmap_bulk_read(data->regmap, STC3117_ADDR_MODE,
+ reg_list, sizeof(reg_list));
+
+ /* soc */
+ value = (reg_list[3] << 8) + reg_list[2];
+ data->hrsoc = value;
+ data->soc = (value * 10 + 256) / 512;
+
+ /* cureent in mA*/
+ value = (reg_list[7] << 8) + reg_list[6];
+ data->batt_current = stc3117_convert(value,
+ CURRENT_LSB_VALUE / battery_info.sense_resistor);
+
+ /* voltage in mV */
+ value = (reg_list[9] << 8) + reg_list[8];
+ data->voltage = stc3117_convert(value, VOLTAGE_LSB_VALUE);
+
+ /* temp */
+ data->temp = reg_list[10];
+
+ /* Avg batt_current in mA */
+ value = (reg_list[12] << 8) + reg_list[11];
+ regmap_read(data->regmap, STC3117_ADDR_MODE, &mode);
+ if (!(mode & STC3117_VMODE)) {
+ value = stc3117_convert(value,
+ CURRENT_LSB_VALUE / battery_info.sense_resistor);
+ value = value / 4;
+ } else {
+ value = stc3117_convert(value, 36 * STC3117_NOMINAL_CAPACITY);
+ }
+ data->avg_current = value;
+
+ /* ocv */
+ value = (reg_list[14] << 8) + reg_list[13];
+ value = stc3117_convert(value, VOLTAGE_LSB_VALUE);
+ value = (value + 2) / 4;
+ data->ocv = value;
+
+ /* CC & VM adjustment counters */
+ regmap_bulk_read(data->regmap, STC3117_ADDR_CC_ADJ_L,
+ data_adjust, sizeof(data_adjust));
+ value = (data_adjust[1] << 8) + data_adjust[0];
+ data->cc_adj = value;
+
+ value = (data_adjust[3] << 8) + data_adjust[2];
+ data->vm_adj = value;
+
+ return 0;
+}
+
+static int stc3117_update_battery_status(struct stc3117_data *data)
+{
+ switch (data->battery_state) {
+ case BATT_CHARGING:
+ if (data->avg_current < CHG_MIN_CURRENT)
+ data->battery_state = BATT_ENDCHARG;
+ break;
+
+ case BATT_ENDCHARG:
+ if (data->batt_current > CHG_MIN_CURRENT)
+ data->battery_state = BATT_CHARGING;
+ else if (data->avg_current < CHG_END_CURRENT)
+ data->battery_state = BATT_IDLE;
+ else if ((data->batt_current > CHG_END_CURRENT) &&
+ (data->voltage > battery_info.voltage_max_mv))
+ data->battery_state = BATT_FULCHARG;
+ break;
+
+ case BATT_FULCHARG:
+ if (data->batt_current > CHG_MIN_CURRENT) {
+ data->battery_state = BATT_CHARGING;
+ } else if (data->avg_current < CHG_END_CURRENT) {
+ if (data->avg_voltage > battery_info.voltage_max_mv) {
+ regmap_write(data->regmap, STC3117_ADDR_SOC_H,
+ (MAX_HRSOC >> 8 & 0xFF));
+ regmap_write(data->regmap, STC3117_ADDR_SOC_L,
+ (MAX_HRSOC & 0xFF));
+ data->soc = MAX_SOC;
+ }
+ data->battery_state = BATT_IDLE;
+ }
+ break;
+
+ case BATT_IDLE:
+ if (data->batt_current > CHG_END_CURRENT)
+ data->battery_state = BATT_CHARGING;
+ else if (data->batt_current < APP_MIN_CURRENT)
+ data->battery_state = BATT_DISCHARG;
+ break;
+
+ case BATT_DISCHARG:
+ if (data->batt_current > APP_MIN_CURRENT)
+ data->battery_state = BATT_IDLE;
+ else if (data->avg_voltage < battery_info.voltage_min_mv)
+ data->battery_state = BATT_LOWBATT;
+ break;
+
+ case BATT_LOWBATT:
+ if (data->avg_voltage > (battery_info.voltage_min_mv + 50))
+ data->battery_state = BATT_IDLE;
+ break;
+
+ default:
+ data->battery_state = BATT_IDLE;
+ }
+
+ return 0;
+}
+
+static int ram_write(struct stc3117_data *data)
+{
+ int ret;
+
+ ret = regmap_bulk_write(data->regmap, STC3117_ADDR_RAM,
+ ram_data.ram_bytes, STC3117_RAM_SIZE);
+ if (ret)
+ return ret;
+
+ return 0;
+};
+
+static int ram_read(struct stc3117_data *data)
+{
+ int ret;
+
+ ret = regmap_bulk_read(data->regmap, STC3117_ADDR_RAM,
+ ram_data.ram_bytes, STC3117_RAM_SIZE);
+ if (ret)
+ return ret;
+
+ return 0;
+};
+
+static int stc3117_set_para(struct stc3117_data *data)
+{
+ int ret;
+
+ ret = regmap_write(data->regmap, STC3117_ADDR_MODE, STC3117_VMODE);
+
+ for (int i = 0; i < STC3117_OCV_TABLE_SIZE; i++)
+ ret |= regmap_write(data->regmap, STC3117_ADDR_OCV_TABLE + i,
+ ocv_value[i] * 100 / 55);
+ if (data->soc_tab[1] != 0)
+ ret |= regmap_bulk_write(data->regmap, STC3117_ADDR_SOC_TABLE,
+ data->soc_tab, STC3117_OCV_TABLE_SIZE);
+
+ ret |= regmap_write(data->regmap, STC3117_ADDR_CC_CNF_H,
+ (ram_data.reg.cc_cnf >> 8) & 0xFF);
+
+ ret |= regmap_write(data->regmap, STC3117_ADDR_CC_CNF_L,
+ ram_data.reg.cc_cnf & 0xFF);
+
+ ret |= regmap_write(data->regmap, STC3117_ADDR_VM_CNF_H,
+ (ram_data.reg.vm_cnf >> 8) & 0xFF);
+
+ ret |= regmap_write(data->regmap, STC3117_ADDR_VM_CNF_L,
+ ram_data.reg.vm_cnf & 0xFF);
+
+ ret |= regmap_write(data->regmap, STC3117_ADDR_CTRL, 0x03);
+
+ ret |= regmap_write(data->regmap, STC3117_ADDR_MODE,
+ STC3117_MIXED_MODE | STC3117_GG_RUN);
+
+ return ret;
+};
+
+static int stc3117_init(struct stc3117_data *data)
+{
+ int ID, ret;
+ int ctrl;
+ int ocv_m, ocv_l;
+
+ regmap_read(data->regmap, STC3117_ADDR_ID, &ID);
+ if (ID != STC3117_ID)
+ return -EINVAL;
+
+ data->cc_cnf = (battery_info.battery_capacity_mah *
+ battery_info.sense_resistor * 250 + 6194) / 12389;
+ data->vm_cnf = (battery_info.battery_capacity_mah
+ * 200 * 50 + 24444) / 48889;
+
+ /* Battery has not been removed */
+ data->presence = 1;
+
+ /* Read RAM data */
+ ret = ram_read(data);
+ if (ret)
+ return ret;
+
+ if (ram_data.reg.testword != STC3117_RAM_TESTWORD ||
+ (crc8(stc3117_crc_table, ram_data.ram_bytes,
+ STC3117_RAM_SIZE, CRC8_INIT)) != 0) {
+ ram_data.reg.testword = STC3117_RAM_TESTWORD;
+ ram_data.reg.cc_cnf = data->cc_cnf;
+ ram_data.reg.vm_cnf = data->vm_cnf;
+ ram_data.reg.crc = crc8(stc3117_crc_table, ram_data.ram_bytes,
+ STC3117_RAM_SIZE - 1, CRC8_INIT);
+
+ ret = regmap_read(data->regmap, STC3117_ADDR_OCV_H, &ocv_m);
+
+ ret |= regmap_read(data->regmap, STC3117_ADDR_OCV_L, &ocv_l);
+
+ ret |= stc3117_set_para(data);
+
+ ret |= regmap_write(data->regmap, STC3117_ADDR_OCV_H, ocv_m);
+
+ ret |= regmap_write(data->regmap, STC3117_ADDR_OCV_L, ocv_l);
+ if (ret)
+ return ret;
+ } else {
+ ret = regmap_read(data->regmap, STC3117_ADDR_CTRL, &ctrl);
+ if (ret)
+ return ret;
+
+ if ((ctrl & STC3117_BATFAIL) != 0 ||
+ (ctrl & STC3117_PORDET) != 0) {
+ ret = regmap_read(data->regmap,
+ STC3117_ADDR_OCV_H, &ocv_m);
+
+ ret |= regmap_read(data->regmap,
+ STC3117_ADDR_OCV_L, &ocv_l);
+
+ ret |= stc3117_set_para(data);
+
+ ret |= regmap_write(data->regmap,
+ STC3117_ADDR_OCV_H, ocv_m);
+
+ ret |= regmap_write(data->regmap,
+ STC3117_ADDR_OCV_L, ocv_l);
+ if (ret)
+ return ret;
+ } else {
+ ret = stc3117_set_para(data);
+ ret |= regmap_write(data->regmap, STC3117_ADDR_SOC_H,
+ (ram_data.reg.hrsoc >> 8 & 0xFF));
+ ret |= regmap_write(data->regmap, STC3117_ADDR_SOC_L,
+ (ram_data.reg.hrsoc & 0xFF));
+ if (ret)
+ return ret;
+ }
+ }
+
+ ram_data.reg.state = STC3117_INIT;
+ ram_data.reg.crc = crc8(stc3117_crc_table, ram_data.ram_bytes,
+ STC3117_RAM_SIZE - 1, CRC8_INIT);
+ ret = ram_write(data);
+ if (ret)
+ return ret;
+
+ data->battery_state = BATT_IDLE;
+
+ return 0;
+};
+
+static int stc3117_task(struct stc3117_data *data)
+{
+ int ID, mode, ret;
+ int count_l, count_m;
+ int ocv_l, ocv_m;
+
+ regmap_read(data->regmap, STC3117_ADDR_ID, &ID);
+ if (ID != STC3117_ID) {
+ data->presence = 0;
+ return -EINVAL;
+ }
+
+ stc3117_get_battery_data(data);
+
+ /* Read RAM data */
+ ret = ram_read(data);
+ if (ret)
+ return ret;
+
+ if (ram_data.reg.testword != STC3117_RAM_TESTWORD ||
+ (crc8(stc3117_crc_table, ram_data.ram_bytes,
+ STC3117_RAM_SIZE, CRC8_INIT) != 0)) {
+ ram_data.reg.testword = STC3117_RAM_TESTWORD;
+ ram_data.reg.cc_cnf = data->cc_cnf;
+ ram_data.reg.vm_cnf = data->vm_cnf;
+ ram_data.reg.crc = crc8(stc3117_crc_table, ram_data.ram_bytes,
+ STC3117_RAM_SIZE - 1, CRC8_INIT);
+ ram_data.reg.state = STC3117_INIT;
+ }
+
+ /* check battery presence status */
+ ret = regmap_read(data->regmap, STC3117_ADDR_CTRL, &mode);
+ if ((mode & STC3117_BATFAIL) != 0) {
+ data->presence = 0;
+ ram_data.reg.testword = 0;
+ ram_data.reg.state = STC3117_INIT;
+ ret = ram_write(data);
+ ret |= regmap_write(data->regmap, STC3117_ADDR_CTRL, STC3117_PORDET);
+ if (ret)
+ return ret;
+ }
+
+ data->presence = 1;
+
+ ret = regmap_read(data->regmap, STC3117_ADDR_MODE, &mode);
+ if (ret)
+ return ret;
+ if ((mode & STC3117_GG_RUN) == 0) {
+ if (ram_data.reg.state > STC3117_INIT) {
+ ret = stc3117_set_para(data);
+
+ ret |= regmap_write(data->regmap, STC3117_ADDR_SOC_H,
+ (ram_data.reg.hrsoc >> 8 & 0xFF));
+ ret |= regmap_write(data->regmap, STC3117_ADDR_SOC_L,
+ (ram_data.reg.hrsoc & 0xFF));
+ if (ret)
+ return ret;
+ } else {
+ ret = regmap_read(data->regmap, STC3117_ADDR_OCV_H, &ocv_m);
+
+ ret |= regmap_read(data->regmap, STC3117_ADDR_OCV_L, &ocv_l);
+
+ ret |= stc3117_set_para(data);
+
+ ret |= regmap_write(data->regmap, STC3117_ADDR_OCV_H, ocv_m);
+
+ ret |= regmap_write(data->regmap, STC3117_ADDR_OCV_L, ocv_l);
+ if (ret)
+ return ret;
+ }
+ ram_data.reg.state = STC3117_INIT;
+ }
+
+ regmap_read(data->regmap, STC3117_ADDR_COUNTER_L, &count_l);
+ regmap_read(data->regmap, STC3117_ADDR_COUNTER_H, &count_m);
+
+ count_m = (count_m << 8) + count_l;
+
+ /* INIT state, wait for batt_current & temperature value available: */
+ if (ram_data.reg.state == STC3117_INIT && count_m > 4) {
+ data->avg_voltage = data->voltage;
+ data->avg_current = data->batt_current;
+ ram_data.reg.state = STC3117_RUNNING;
+ }
+
+ if (ram_data.reg.state != STC3117_RUNNING) {
+ data->batt_current = 0;
+ data->temp = 250;
+ } else {
+ if (data->voltage < APP_CUTOFF_VOLTAGE)
+ data->soc = 0;
+
+ if (mode & STC3117_VMODE) {
+ data->avg_current = 0;
+ data->batt_current = 0;
+ } else {
+ stc3117_update_battery_status(data);
+ }
+ }
+
+ ram_data.reg.hrsoc = data->hrsoc;
+ ram_data.reg.soc = (data->soc + 5) / 10;
+ ram_data.reg.crc = crc8(stc3117_crc_table, ram_data.ram_bytes,
+ STC3117_RAM_SIZE - 1, CRC8_INIT);
+
+ ret = ram_write(data);
+ if (ret)
+ return ret;
+ return 0;
+};
+
+static void fuel_gauge_update_work(struct work_struct *work)
+{
+ struct stc3117_data *data = container_of(to_delayed_work(work),
+ struct stc3117_data, update_work);
+ stc3117_task(data);
+
+ /* Schedule the work to run again in 2 seconds */
+ schedule_delayed_work(&data->update_work, msecs_to_jiffies(2000));
+}
+
+static int stc3117_get_property(struct power_supply *psy,
+ enum power_supply_property psp, union power_supply_propval *val)
+{
+ struct stc3117_data *data = power_supply_get_drvdata(psy);
+
+ switch (psp) {
+ case POWER_SUPPLY_PROP_STATUS:
+ if (data->soc > BATTERY_FULL)
+ val->intval = POWER_SUPPLY_STATUS_FULL;
+ else if (data->batt_current < 0)
+ val->intval = POWER_SUPPLY_STATUS_CHARGING;
+ else if (data->batt_current > 0)
+ val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
+ else
+ val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
+ break;
+ case POWER_SUPPLY_PROP_VOLTAGE_NOW:
+ val->intval = data->voltage;
+ break;
+ case POWER_SUPPLY_PROP_CURRENT_NOW:
+ val->intval = data->batt_current;
+ break;
+ case POWER_SUPPLY_PROP_CAPACITY:
+ val->intval = data->soc;
+ break;
+ case POWER_SUPPLY_PROP_TEMP:
+ val->intval = data->temp;
+ break;
+ case POWER_SUPPLY_PROP_PRESENT:
+ val->intval = data->presence;
+ break;
+ default:
+ return -EINVAL;
+ }
+ return 0;
+}
+
+static enum power_supply_property stc3117_battery_props[] = {
+ POWER_SUPPLY_PROP_STATUS,
+ POWER_SUPPLY_PROP_VOLTAGE_NOW,
+ POWER_SUPPLY_PROP_CURRENT_NOW,
+ POWER_SUPPLY_PROP_CAPACITY,
+ POWER_SUPPLY_PROP_TEMP,
+ POWER_SUPPLY_PROP_PRESENT,
+};
+
+static const struct power_supply_desc stc3117_battery_desc = {
+ .name = "stc3117-battery",
+ .type = POWER_SUPPLY_TYPE_BATTERY,
+ .get_property = stc3117_get_property,
+ .properties = stc3117_battery_props,
+ .num_properties = ARRAY_SIZE(stc3117_battery_props),
+};
+
+static const struct regmap_config stc3117_regmap_config = {
+ .reg_bits = 8,
+ .val_bits = 8,
+};
+
+static int stc3117_probe(struct i2c_client *client)
+{
+ struct stc3117_data *data;
+ struct power_supply_config psy_cfg = {};
+ struct power_supply_battery_info *info;
+ int ret;
+
+ data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ data->client = client;
+ data->regmap = devm_regmap_init_i2c(client, &stc3117_regmap_config);
+ if (IS_ERR(data->regmap))
+ return PTR_ERR(data->regmap);
+
+ psy_cfg.drv_data = data;
+
+ crc8_populate_msb(stc3117_crc_table, CRC8_POLYNOMIAL);
+
+ data->battery = devm_power_supply_register(&client->dev,
+ &stc3117_battery_desc, &psy_cfg);
+ if (IS_ERR(data->battery))
+ return dev_err_probe(&client->dev, PTR_ERR(data->battery),
+ "failed to register battery\n");
+
+ ret = device_property_read_u32(&client->dev, "shunt-resistor-micro-ohms",
+ &battery_info.sense_resistor);
+ if (ret)
+ return dev_err_probe(&client->dev, ret,
+ "failed to get sense-registor\n");
+ battery_info.sense_resistor = battery_info.sense_resistor / 1000;
+
+ ret = power_supply_get_battery_info(data->battery, &info);
+ if (ret)
+ return dev_err_probe(&client->dev, ret,
+ "failed to get battery information\n");
+
+ battery_info.battery_capacity_mah = info->charge_full_design_uah / 1000;
+ battery_info.voltage_min_mv = info->voltage_min_design_uv / 1000;
+ battery_info.voltage_max_mv = info->voltage_max_design_uv / 1000;
+
+ ret = stc3117_init(data);
+ if (ret)
+ return dev_err_probe(&client->dev, ret,
+ "failed to initialize of stc3117\n");
+
+ INIT_DELAYED_WORK(&data->update_work, fuel_gauge_update_work);
+
+ schedule_delayed_work(&data->update_work, 0);
+
+ return 0;
+}
+
+static const struct i2c_device_id stc3117_id[] = {
+ { "stc3117", 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, stc3117_id);
+
+static const struct of_device_id stc3117_of_match[] = {
+ { .compatible = "st,stc3117" },
+ { }
+};
+MODULE_DEVICE_TABLE(of, stc3117_of_match);
+
+static struct i2c_driver stc3117_i2c_driver = {
+ .driver = {
+ .name = "stc3117_i2c_driver",
+ .of_match_table = stc3117_of_match,
+ },
+ .probe = stc3117_probe,
+ .id_table = stc3117_id,
+};
+
+module_i2c_driver(stc3117_i2c_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Hardevsinh Palaniya <hardevsinh.palaniya@xxxxxxxxxxxxxxxxx>");
+MODULE_AUTHOR("Bhavin Sharma <bhavin.sharma@xxxxxxxxxxxxxxxxx>");
+MODULE_DESCRIPTION("STC3117 Fuel Gauge Driver");
--
2.43.0
