Add support for the LTC4162-L Li-Ion battery charger. The driver allows
reading back telemetry and to set some charging options like the input
current limit.
Signed-off-by: Mike Looijmans <[email protected]>
---
v2: Use microohm units instead of milliohm
Add interrupt support using smbalert
Support obtaining cell-count from devicetree
v3: Fix overflows in calculations involving resistor values
v4: Use attr_grp member to register attributes
Report input current/voltage for charger and make battery
voltage and current into sysfs attributes
v5: Remove ltc4162l_remove since core now takes care of attributes
Add ABI documentation for attributes
.../ABI/testing/sysfs-class-power-ltc4162l | 82 ++
drivers/power/supply/Kconfig | 8 +
drivers/power/supply/Makefile | 1 +
drivers/power/supply/ltc4162-l-charger.c | 931 ++++++++++++++++++
4 files changed, 1022 insertions(+)
create mode 100644 Documentation/ABI/testing/sysfs-class-power-ltc4162l
create mode 100644 drivers/power/supply/ltc4162-l-charger.c
diff --git a/Documentation/ABI/testing/sysfs-class-power-ltc4162l b/Documentation/ABI/testing/sysfs-class-power-ltc4162l
new file mode 100644
index 000000000000..ba30db93052b
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-class-power-ltc4162l
@@ -0,0 +1,82 @@
+What: /sys/class/power_supply/ltc4162-l/charge_status
+Date: Januari 2021
+KernelVersion: 5.11
+Description:
+ Detailed charge status information as reported by the chip.
+
+ Access: Read
+
+ Valid values:
+ ilim_reg_active
+ thermal_reg_active
+ vin_uvcl_active
+ iin_limit_active
+ constant_current
+ constant_voltage
+ charger_off
+
+What: /sys/class/power_supply/ltc4162-l/ibat
+Date: Januari 2021
+KernelVersion: 5.11
+Description:
+ Battery input current as measured by the charger. Negative value
+ means that the battery is discharging.
+
+ Access: Read
+
+ Valid values: Signed value in microamps
+
+What: /sys/class/power_supply/ltc4162-l/vbat
+Date: Januari 2021
+KernelVersion: 5.11
+Description:
+ Battery voltage as measured by the charger.
+
+ Access: Read
+
+ Valid values: In microvolts
+
+What: /sys/class/power_supply/ltc4162-l/vbat_avg
+Date: Januari 2021
+KernelVersion: 5.11
+Description:
+ Battery voltage, averaged over time, as measured by the charger.
+
+ Access: Read
+
+ Valid values: In microvolts
+
+What: /sys/class/power_supply/ltc4162-l/force_telemetry
+Date: Januari 2021
+KernelVersion: 5.11
+Description:
+ To save battery current, the measurement system is disabled if
+ the battery is the only source of power. This affects all
+ voltage, current and temperature measurements.
+ Write a "1" to this to keep performing telemetry once every few
+ seconds, even when running on battery (as reported by the online
+ property, which is "1" when external power is available and "0"
+ when the system runs on battery).
+
+ Access: Read, Write
+
+ Valid values: 0 (disabled) or 1 (enabled)
+
+What: /sys/class/power_supply/ltc4162-l/arm_ship_mode
+Date: Januari 2021
+KernelVersion: 5.11
+Description:
+ The charger will normally drain the battery while inactive,
+ typically drawing about 54 microamps. Write a "1" to this
+ property to arm a special "ship" mode that extends shelf life
+ by reducing the leakage to about 2.8 microamps. The chip will
+ remain in this mode (and no longer respond to I2C commands)
+ until some external power-supply is attached raising the input
+ voltage above 1V. It will then automatically revert to "0".
+ Writing a "0" to the property cancels the "ship" mode request.
+ The ship mode, when armed, activates once the input voltage
+ drops below 1V.
+
+ Access: Read, Write
+
+ Valid values: 0 (disable) or 1 (enable)
diff --git a/drivers/power/supply/Kconfig b/drivers/power/supply/Kconfig
index eec646c568b7..23000976cb42 100644
--- a/drivers/power/supply/Kconfig
+++ b/drivers/power/supply/Kconfig
@@ -513,6 +513,14 @@ config CHARGER_LT3651
Say Y to include support for the Analog Devices (Linear Technology)
LT3651 battery charger which reports its status via GPIO lines.
+config CHARGER_LTC4162L
+ tristate "LTC4162-L charger"
+ depends on I2C
+ select REGMAP_I2C
+ help
+ Say Y to include support for the Analog Devices (Linear Technology)
+ LTC4162-L battery charger connected to I2C.
+
config CHARGER_MAX14577
tristate "Maxim MAX14577/77836 battery charger driver"
depends on MFD_MAX14577
diff --git a/drivers/power/supply/Makefile b/drivers/power/supply/Makefile
index dd4b86318cd9..17b1cf921c44 100644
--- a/drivers/power/supply/Makefile
+++ b/drivers/power/supply/Makefile
@@ -70,6 +70,7 @@ obj-$(CONFIG_CHARGER_LP8788) += lp8788-charger.o
obj-$(CONFIG_CHARGER_GPIO) += gpio-charger.o
obj-$(CONFIG_CHARGER_MANAGER) += charger-manager.o
obj-$(CONFIG_CHARGER_LT3651) += lt3651-charger.o
+obj-$(CONFIG_CHARGER_LTC4162L) += ltc4162-l-charger.o
obj-$(CONFIG_CHARGER_MAX14577) += max14577_charger.o
obj-$(CONFIG_CHARGER_DETECTOR_MAX14656) += max14656_charger_detector.o
obj-$(CONFIG_CHARGER_MAX77650) += max77650-charger.o
diff --git a/drivers/power/supply/ltc4162-l-charger.c b/drivers/power/supply/ltc4162-l-charger.c
new file mode 100644
index 000000000000..cded6484febb
--- /dev/null
+++ b/drivers/power/supply/ltc4162-l-charger.c
@@ -0,0 +1,931 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Driver for Analog Devices (Linear Technology) LTC4162-L charger IC.
+ * Copyright (C) 2020, Topic Embedded Products
+ */
+
+#include <linux/module.h>
+#include <linux/delay.h>
+#include <linux/of_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/power_supply.h>
+#include <linux/i2c.h>
+#include <linux/regmap.h>
+
+/* Registers (names based on what datasheet uses) */
+#define LTC4162L_EN_LIMIT_ALERTS_REG 0x0D
+#define LTC4162L_EN_CHARGER_STATE_ALERTS_REG 0x0E
+#define LTC4162L_EN_CHARGE_STATUS_ALERTS_REG 0x0F
+#define LTC4162L_CONFIG_BITS_REG 0x14
+#define LTC4162L_IIN_LIMIT_TARGET 0x15
+#define LTC4162L_ARM_SHIP_MODE 0x19
+#define LTC4162L_CHARGE_CURRENT_SETTING 0X1A
+#define LTC4162L_VCHARGE_SETTING 0X1B
+#define LTC4162L_C_OVER_X_THRESHOLD 0x1C
+#define LTC4162L_MAX_CV_TIME 0X1D
+#define LTC4162L_MAX_CHARGE_TIME 0X1E
+#define LTC4162L_CHARGER_CONFIG_BITS 0x29
+#define LTC4162L_CHARGER_STATE 0x34
+#define LTC4162L_CHARGE_STATUS 0x35
+#define LTC4162L_LIMIT_ALERTS_REG 0x36
+#define LTC4162L_CHARGER_STATE_ALERTS_REG 0x37
+#define LTC4162L_CHARGE_STATUS_ALERTS_REG 0x38
+#define LTC4162L_SYSTEM_STATUS_REG 0x39
+#define LTC4162L_VBAT 0x3A
+#define LTC4162L_VIN 0x3B
+#define LTC4162L_VOUT 0x3C
+#define LTC4162L_IBAT 0x3D
+#define LTC4162L_IIN 0x3E
+#define LTC4162L_DIE_TEMPERATURE 0x3F
+#define LTC4162L_THERMISTOR_VOLTAGE 0x40
+#define LTC4162L_BSR 0x41
+#define LTC4162L_JEITA_REGION 0x42
+#define LTC4162L_CHEM_CELLS_REG 0x43
+#define LTC4162L_ICHARGE_DAC 0x44
+#define LTC4162L_VCHARGE_DAC 0x45
+#define LTC4162L_IIN_LIMIT_DAC 0x46
+#define LTC4162L_VBAT_FILT 0x47
+#define LTC4162L_INPUT_UNDERVOLTAGE_DAC 0x4B
+
+/* Enumeration as in datasheet. Individual bits are mutually exclusive. */
+enum ltc4162l_state {
+ battery_detection = 2048,
+ charger_suspended = 256,
+ precharge = 128, /* trickle on low bat voltage */
+ cc_cv_charge = 64, /* normal charge */
+ ntc_pause = 32,
+ timer_term = 16,
+ c_over_x_term = 8, /* battery is full */
+ max_charge_time_fault = 4,
+ bat_missing_fault = 2,
+ bat_short_fault = 1
+};
+
+/* Individual bits are mutually exclusive. Only active in charging states.*/
+enum ltc4162l_charge_status {
+ ilim_reg_active = 32,
+ thermal_reg_active = 16,
+ vin_uvcl_active = 8,
+ iin_limit_active = 4,
+ constant_current = 2,
+ constant_voltage = 1,
+ charger_off = 0
+};
+
+/* Magic number to write to ARM_SHIP_MODE register */
+#define LTC4162L_ARM_SHIP_MODE_MAGIC 21325
+
+struct ltc4162l_info {
+ struct i2c_client *client;
+ struct regmap *regmap;
+ struct power_supply *charger;
+ u32 rsnsb; /* Series resistor that sets charge current, microOhm */
+ u32 rsnsi; /* Series resistor to measure input current, microOhm */
+ u8 cell_count; /* Number of connected cells, 0 while unknown */
+};
+
+static u8 ltc4162l_get_cell_count(struct ltc4162l_info *info)
+{
+ int ret;
+ unsigned int val;
+
+ /* Once read successfully */
+ if (info->cell_count)
+ return info->cell_count;
+
+ ret = regmap_read(info->regmap, LTC4162L_CHEM_CELLS_REG, &val);
+ if (ret)
+ return 0;
+
+ /* Lower 4 bits is the cell count, or 0 if the chip doesn't know yet */
+ val &= 0x0f;
+ if (!val)
+ return 0;
+
+ /* Once determined, keep the value */
+ info->cell_count = val;
+
+ return val;
+};
+
+/* Convert enum value to POWER_SUPPLY_STATUS value */
+static int ltc4162l_state_decode(enum ltc4162l_state value)
+{
+ switch (value) {
+ case precharge:
+ case cc_cv_charge:
+ return POWER_SUPPLY_STATUS_CHARGING;
+ case c_over_x_term:
+ return POWER_SUPPLY_STATUS_FULL;
+ case bat_missing_fault:
+ case bat_short_fault:
+ return POWER_SUPPLY_STATUS_UNKNOWN;
+ default:
+ return POWER_SUPPLY_STATUS_NOT_CHARGING;
+ }
+};
+
+static int ltc4162l_get_status(struct ltc4162l_info *info,
+ union power_supply_propval *val)
+{
+ unsigned int regval;
+ int ret;
+
+ ret = regmap_read(info->regmap, LTC4162L_CHARGER_STATE, ®val);
+ if (ret) {
+ dev_err(&info->client->dev, "Failed to read CHARGER_STATE\n");
+ return ret;
+ }
+
+ val->intval = ltc4162l_state_decode(regval);
+
+ return 0;
+}
+
+static int ltc4162l_charge_status_decode(enum ltc4162l_charge_status value)
+{
+ if (!value)
+ return POWER_SUPPLY_CHARGE_TYPE_NONE;
+
+ /* constant voltage/current and input_current limit are "fast" modes */
+ if (value <= iin_limit_active)
+ return POWER_SUPPLY_CHARGE_TYPE_FAST;
+
+ /* Anything that's not fast we'll return as trickle */
+ return POWER_SUPPLY_CHARGE_TYPE_TRICKLE;
+}
+
+static int ltc4162l_get_charge_type(struct ltc4162l_info *info,
+ union power_supply_propval *val)
+{
+ unsigned int regval;
+ int ret;
+
+ ret = regmap_read(info->regmap, LTC4162L_CHARGE_STATUS, ®val);
+ if (ret)
+ return ret;
+
+ val->intval = ltc4162l_charge_status_decode(regval);
+
+ return 0;
+}
+
+static int ltc4162l_state_to_health(enum ltc4162l_state value)
+{
+ switch (value) {
+ case ntc_pause:
+ return POWER_SUPPLY_HEALTH_OVERHEAT;
+ case timer_term:
+ return POWER_SUPPLY_HEALTH_SAFETY_TIMER_EXPIRE;
+ case max_charge_time_fault:
+ return POWER_SUPPLY_HEALTH_WATCHDOG_TIMER_EXPIRE;
+ case bat_missing_fault:
+ return POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
+ case bat_short_fault:
+ return POWER_SUPPLY_HEALTH_DEAD;
+ default:
+ return POWER_SUPPLY_HEALTH_GOOD;
+ }
+}
+
+static int ltc4162l_get_health(struct ltc4162l_info *info,
+ union power_supply_propval *val)
+{
+ unsigned int regval;
+ int ret;
+
+ ret = regmap_read(info->regmap, LTC4162L_CHARGER_STATE, ®val);
+ if (ret)
+ return ret;
+
+ val->intval = ltc4162l_state_to_health(regval);
+
+ return 0;
+}
+
+static int ltc4162l_get_online(struct ltc4162l_info *info,
+ union power_supply_propval *val)
+{
+ unsigned int regval;
+ int ret;
+
+ ret = regmap_read(info->regmap, LTC4162L_SYSTEM_STATUS_REG, ®val);
+ if (ret)
+ return ret;
+
+ /* BIT(2) indicates if input voltage is sufficient to charge */
+ val->intval = !!(regval & BIT(2));
+
+ return 0;
+}
+
+static int ltc4162l_get_vbat(struct ltc4162l_info *info,
+ unsigned int reg,
+ union power_supply_propval *val)
+{
+ unsigned int regval;
+ int ret;
+
+ ret = regmap_read(info->regmap, reg, ®val);
+ if (ret)
+ return ret;
+
+ /* cell_count × 192.4μV/LSB */
+ regval *= 1924;
+ regval *= ltc4162l_get_cell_count(info);
+ regval /= 10;
+ val->intval = regval;
+
+ return 0;
+}
+
+static int ltc4162l_get_ibat(struct ltc4162l_info *info,
+ union power_supply_propval *val)
+{
+ unsigned int regval;
+ int ret;
+
+ ret = regmap_read(info->regmap, LTC4162L_IBAT, ®val);
+ if (ret)
+ return ret;
+
+ /* Signed 16-bit number, 1.466μV / RSNSB amperes/LSB. */
+ ret = (s16)(regval & 0xFFFF);
+ val->intval = 100 * mult_frac(ret, 14660, (int)info->rsnsb);
+
+ return 0;
+}
+
+
+static int ltc4162l_get_input_voltage(struct ltc4162l_info *info,
+ union power_supply_propval *val)
+{
+ unsigned int regval;
+ int ret;
+
+ ret = regmap_read(info->regmap, LTC4162L_VIN, ®val);
+ if (ret)
+ return ret;
+
+ /* 1.649mV/LSB */
+ val->intval = regval * 1694;
+
+ return 0;
+}
+
+static int ltc4162l_get_input_current(struct ltc4162l_info *info,
+ union power_supply_propval *val)
+{
+ unsigned int regval;
+ int ret;
+
+ ret = regmap_read(info->regmap, LTC4162L_IIN, ®val);
+ if (ret)
+ return ret;
+
+ /* Signed 16-bit number, 1.466μV / RSNSI amperes/LSB. */
+ ret = (s16)(regval & 0xFFFF);
+ ret *= 14660;
+ ret /= info->rsnsi;
+ ret *= 100;
+
+ val->intval = ret;
+
+ return 0;
+}
+
+static int ltc4162l_get_icharge(struct ltc4162l_info *info,
+ unsigned int reg,
+ union power_supply_propval *val)
+{
+ unsigned int regval;
+ int ret;
+
+ ret = regmap_read(info->regmap, reg, ®val);
+ if (ret)
+ return ret;
+
+ regval &= BIT(6) - 1; /* Only the lower 5 bits */
+
+ /* The charge current servo level: (icharge_dac + 1) × 1mV/RSNSB */
+ ++regval;
+ val->intval = 10000u * mult_frac(regval, 100000u, info->rsnsb);
+
+ return 0;
+}
+
+static int ltc4162l_set_icharge(struct ltc4162l_info *info,
+ unsigned int reg,
+ unsigned int value)
+{
+ value = mult_frac(value, info->rsnsb, 100000u);
+ value /= 10000u;
+
+ /* Round to lowest possible */
+ if (value)
+ --value;
+
+ if (value > 31)
+ return -EINVAL;
+
+ return regmap_write(info->regmap, reg, value);
+}
+
+
+static int ltc4162l_get_vcharge(struct ltc4162l_info *info,
+ unsigned int reg,
+ union power_supply_propval *val)
+{
+ unsigned int regval;
+ int ret;
+ u32 voltage;
+
+ ret = regmap_read(info->regmap, reg, ®val);
+ if (ret)
+ return ret;
+
+ regval &= BIT(6) - 1; /* Only the lower 5 bits */
+
+ /*
+ * charge voltage setting can be computed from
+ * cell_count × (vcharge_setting × 12.5mV + 3.8125V)
+ * where vcharge_setting ranges from 0 to 31 (4.2V max).
+ */
+ voltage = 3812500 + (regval * 12500);
+ voltage *= ltc4162l_get_cell_count(info);
+ val->intval = voltage;
+
+ return 0;
+}
+
+static int ltc4162l_set_vcharge(struct ltc4162l_info *info,
+ unsigned int reg,
+ unsigned int value)
+{
+ u8 cell_count = ltc4162l_get_cell_count(info);
+
+ if (!cell_count)
+ return -EBUSY; /* Not available yet, try again later */
+
+ value /= cell_count;
+
+ if (value < 3812500)
+ return -EINVAL;
+
+ value -= 3812500;
+ value /= 12500;
+
+ if (value > 31)
+ return -EINVAL;
+
+ return regmap_write(info->regmap, reg, value);
+}
+
+static int ltc4162l_get_iin_limit_dac(struct ltc4162l_info *info,
+ union power_supply_propval *val)
+{
+ unsigned int regval;
+ int ret;
+
+ ret = regmap_read(info->regmap, LTC4162L_IIN_LIMIT_DAC, ®val);
+ if (ret)
+ return ret;
+
+ regval &= BIT(6) - 1; /* Only 6 bits */
+
+ /* (iin_limit_dac + 1) × 500μV / RSNSI */
+ ++regval;
+ regval *= 5000000u;
+ regval /= info->rsnsi;
+ val->intval = 100u * regval;
+
+ return 0;
+}
+
+static int ltc4162l_set_iin_limit(struct ltc4162l_info *info,
+ unsigned int value)
+{
+ unsigned int regval;
+
+ regval = mult_frac(value, info->rsnsi, 50000u);
+ regval /= 10000u;
+ if (regval)
+ --regval;
+ if (regval > 63)
+ regval = 63;
+
+ return regmap_write(info->regmap, LTC4162L_IIN_LIMIT_TARGET, regval);
+}
+
+static int ltc4162l_get_die_temp(struct ltc4162l_info *info,
+ union power_supply_propval *val)
+{
+ unsigned int regval;
+ int ret;
+
+ ret = regmap_read(info->regmap, LTC4162L_DIE_TEMPERATURE, ®val);
+ if (ret)
+ return ret;
+
+ /* die_temp × 0.0215°C/LSB - 264.4°C */
+ ret = (s16)(regval & 0xFFFF);
+ ret *= 215;
+ ret /= 100; /* Centidegrees scale */
+ ret -= 26440;
+ val->intval = ret;
+
+ return 0;
+}
+
+static int ltc4162l_get_term_current(struct ltc4162l_info *info,
+ union power_supply_propval *val)
+{
+ unsigned int regval;
+ int ret;
+
+ ret = regmap_read(info->regmap, LTC4162L_CHARGER_CONFIG_BITS, ®val);
+ if (ret)
+ return ret;
+
+ /* Check if C_OVER_X_THRESHOLD is enabled */
+ if (!(regval & BIT(2))) {
+ val->intval = 0;
+ return 0;
+ }
+
+ ret = regmap_read(info->regmap, LTC4162L_C_OVER_X_THRESHOLD, ®val);
+ if (ret)
+ return ret;
+
+ /* 1.466μV / RSNSB amperes/LSB */
+ regval *= 14660u;
+ regval /= info->rsnsb;
+ val->intval = 100 * regval;
+
+ return 0;
+}
+
+static int ltc4162l_set_term_current(struct ltc4162l_info *info,
+ unsigned int value)
+{
+ int ret;
+ unsigned int regval;
+
+ if (!value) {
+ /* Disable en_c_over_x_term when set to zero */
+ return regmap_update_bits(info->regmap,
+ LTC4162L_CHARGER_CONFIG_BITS,
+ BIT(2), 0);
+ }
+
+ regval = mult_frac(value, info->rsnsb, 14660u);
+ regval /= 100u;
+
+ ret = regmap_write(info->regmap, LTC4162L_C_OVER_X_THRESHOLD, regval);
+ if (ret)
+ return ret;
+
+ /* Set en_c_over_x_term after changing the threshold value */
+ return regmap_update_bits(info->regmap, LTC4162L_CHARGER_CONFIG_BITS,
+ BIT(2), BIT(2));
+}
+
+/* Custom properties */
+static const char * const ltc4162l_charge_status_name[] = {
+ "ilim_reg_active", /* 32 */
+ "thermal_reg_active",
+ "vin_uvcl_active",
+ "iin_limit_active",
+ "constant_current",
+ "constant_voltage",
+ "charger_off" /* 0 */
+};
+
+static ssize_t charge_status_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct power_supply *psy = to_power_supply(dev);
+ struct ltc4162l_info *info = power_supply_get_drvdata(psy);
+ const char *result = ltc4162l_charge_status_name[
+ ARRAY_SIZE(ltc4162l_charge_status_name) - 1];
+ unsigned int regval;
+ unsigned int mask;
+ unsigned int index;
+ int ret;
+
+ ret = regmap_read(info->regmap, LTC4162L_CHARGE_STATUS, ®val);
+ if (ret)
+ return ret;
+
+ /* Only one bit is set according to datasheet, let's be safe here */
+ for (mask = 32, index = 0; mask != 0; mask >>= 1, ++index) {
+ if (regval & mask) {
+ result = ltc4162l_charge_status_name[index];
+ break;
+ }
+ }
+
+ return sprintf(buf, "%s\n", result);
+}
+static DEVICE_ATTR_RO(charge_status);
+
+static ssize_t vbat_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct power_supply *psy = to_power_supply(dev);
+ struct ltc4162l_info *info = power_supply_get_drvdata(psy);
+ union power_supply_propval val;
+ int ret;
+
+ ret = ltc4162l_get_vbat(info, LTC4162L_VBAT, &val);
+ if (ret)
+ return ret;
+
+ return sprintf(buf, "%d\n", val.intval);
+}
+static DEVICE_ATTR_RO(vbat);
+
+static ssize_t vbat_avg_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct power_supply *psy = to_power_supply(dev);
+ struct ltc4162l_info *info = power_supply_get_drvdata(psy);
+ union power_supply_propval val;
+ int ret;
+
+ ret = ltc4162l_get_vbat(info, LTC4162L_VBAT_FILT, &val);
+ if (ret)
+ return ret;
+
+ return sprintf(buf, "%d\n", val.intval);
+}
+static DEVICE_ATTR_RO(vbat_avg);
+
+static ssize_t ibat_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct power_supply *psy = to_power_supply(dev);
+ struct ltc4162l_info *info = power_supply_get_drvdata(psy);
+ union power_supply_propval val;
+ int ret;
+
+ ret = ltc4162l_get_ibat(info, &val);
+ if (ret)
+ return ret;
+
+ return sprintf(buf, "%d\n", val.intval);
+}
+static DEVICE_ATTR_RO(ibat);
+
+static ssize_t force_telemetry_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct power_supply *psy = to_power_supply(dev);
+ struct ltc4162l_info *info = power_supply_get_drvdata(psy);
+ unsigned int regval;
+ int ret;
+
+ ret = regmap_read(info->regmap, LTC4162L_CONFIG_BITS_REG, ®val);
+ if (ret)
+ return ret;
+
+ return sprintf(buf, "%u\n", regval & BIT(2) ? 1 : 0);
+}
+
+static ssize_t force_telemetry_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf,
+ size_t count)
+{
+ struct power_supply *psy = to_power_supply(dev);
+ struct ltc4162l_info *info = power_supply_get_drvdata(psy);
+ int ret;
+ unsigned int value;
+
+ ret = kstrtouint(buf, 0, &value);
+ if (ret < 0)
+ return ret;
+
+ ret = regmap_update_bits(info->regmap, LTC4162L_CONFIG_BITS_REG,
+ BIT(2), value ? BIT(2) : 0);
+ if (ret < 0)
+ return ret;
+
+ return count;
+}
+
+static DEVICE_ATTR_RW(force_telemetry);
+
+static ssize_t arm_ship_mode_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct power_supply *psy = to_power_supply(dev);
+ struct ltc4162l_info *info = power_supply_get_drvdata(psy);
+ unsigned int regval;
+ int ret;
+
+ ret = regmap_read(info->regmap, LTC4162L_ARM_SHIP_MODE, ®val);
+ if (ret)
+ return ret;
+
+ return sprintf(buf, "%u\n",
+ regval == LTC4162L_ARM_SHIP_MODE_MAGIC ? 1 : 0);
+}
+
+static ssize_t arm_ship_mode_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf,
+ size_t count)
+{
+ struct power_supply *psy = to_power_supply(dev);
+ struct ltc4162l_info *info = power_supply_get_drvdata(psy);
+ int ret;
+ unsigned int value;
+
+ ret = kstrtouint(buf, 0, &value);
+ if (ret < 0)
+ return ret;
+
+ ret = regmap_write(info->regmap, LTC4162L_ARM_SHIP_MODE,
+ value ? LTC4162L_ARM_SHIP_MODE_MAGIC : 0);
+ if (ret < 0)
+ return ret;
+
+ return count;
+}
+
+static DEVICE_ATTR_RW(arm_ship_mode);
+
+static struct attribute *ltc4162l_sysfs_entries[] = {
+ &dev_attr_charge_status.attr,
+ &dev_attr_ibat.attr,
+ &dev_attr_vbat.attr,
+ &dev_attr_vbat_avg.attr,
+ &dev_attr_force_telemetry.attr,
+ &dev_attr_arm_ship_mode.attr,
+ NULL,
+};
+
+static struct attribute_group ltc4162l_attr_group = {
+ .name = NULL, /* put in device directory */
+ .attrs = ltc4162l_sysfs_entries,
+};
+
+static const struct attribute_group *ltc4162l_attr_groups[] = {
+ <c4162l_attr_group,
+ NULL,
+};
+
+static int ltc4162l_get_property(struct power_supply *psy,
+ enum power_supply_property psp,
+ union power_supply_propval *val)
+{
+ struct ltc4162l_info *info = power_supply_get_drvdata(psy);
+
+ switch (psp) {
+ case POWER_SUPPLY_PROP_STATUS:
+ return ltc4162l_get_status(info, val);
+ case POWER_SUPPLY_PROP_CHARGE_TYPE:
+ return ltc4162l_get_charge_type(info, val);
+ case POWER_SUPPLY_PROP_HEALTH:
+ return ltc4162l_get_health(info, val);
+ case POWER_SUPPLY_PROP_ONLINE:
+ return ltc4162l_get_online(info, val);
+ case POWER_SUPPLY_PROP_VOLTAGE_NOW:
+ return ltc4162l_get_input_voltage(info, val);
+ case POWER_SUPPLY_PROP_CURRENT_NOW:
+ return ltc4162l_get_input_current(info, val);
+ case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
+ return ltc4162l_get_icharge(info,
+ LTC4162L_ICHARGE_DAC, val);
+ case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX:
+ return ltc4162l_get_icharge(info,
+ LTC4162L_CHARGE_CURRENT_SETTING, val);
+ case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
+ return ltc4162l_get_vcharge(info,
+ LTC4162L_VCHARGE_DAC, val);
+ case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX:
+ return ltc4162l_get_vcharge(info,
+ LTC4162L_VCHARGE_SETTING, val);
+ case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
+ return ltc4162l_get_iin_limit_dac(info, val);
+ case POWER_SUPPLY_PROP_TEMP:
+ return ltc4162l_get_die_temp(info, val);
+ case POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT:
+ return ltc4162l_get_term_current(info, val);
+ default:
+ return -EINVAL;
+ }
+}
+
+static int ltc4162l_set_property(struct power_supply *psy,
+ enum power_supply_property psp,
+ const union power_supply_propval *val)
+{
+ struct ltc4162l_info *info = power_supply_get_drvdata(psy);
+
+ switch (psp) {
+ case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX:
+ return ltc4162l_set_icharge(info,
+ LTC4162L_CHARGE_CURRENT_SETTING, val->intval);
+ case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX:
+ return ltc4162l_set_vcharge(info,
+ LTC4162L_VCHARGE_SETTING, val->intval);
+ case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
+ return ltc4162l_set_iin_limit(info, val->intval);
+ case POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT:
+ return ltc4162l_set_term_current(info, val->intval);
+ default:
+ return -EINVAL;
+ }
+}
+
+static int ltc4162l_property_is_writeable(struct power_supply *psy,
+ enum power_supply_property psp)
+{
+ switch (psp) {
+ case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX:
+ case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX:
+ case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
+ case POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT:
+ return 1;
+ default:
+ return 0;
+ }
+}
+
+/* Charger power supply property routines */
+static enum power_supply_property ltc4162l_properties[] = {
+ POWER_SUPPLY_PROP_STATUS,
+ POWER_SUPPLY_PROP_CHARGE_TYPE,
+ POWER_SUPPLY_PROP_HEALTH,
+ POWER_SUPPLY_PROP_ONLINE,
+ POWER_SUPPLY_PROP_VOLTAGE_NOW,
+ POWER_SUPPLY_PROP_CURRENT_NOW,
+ 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_TEMP,
+ POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT,
+};
+
+static const struct power_supply_desc ltc4162l_desc = {
+ .name = "ltc4162-l",
+ .type = POWER_SUPPLY_TYPE_MAINS,
+ .properties = ltc4162l_properties,
+ .num_properties = ARRAY_SIZE(ltc4162l_properties),
+ .get_property = ltc4162l_get_property,
+ .set_property = ltc4162l_set_property,
+ .property_is_writeable = ltc4162l_property_is_writeable,
+};
+
+static bool ltc4162l_is_writeable_reg(struct device *dev, unsigned int reg)
+{
+ /* all registers up to this one are writeable */
+ if (reg <= LTC4162L_CHARGER_CONFIG_BITS)
+ return true;
+
+ /* The ALERTS registers can be written to clear alerts */
+ if (reg >= LTC4162L_LIMIT_ALERTS_REG &&
+ reg <= LTC4162L_CHARGE_STATUS_ALERTS_REG)
+ return true;
+
+ return false;
+}
+
+static bool ltc4162l_is_volatile_reg(struct device *dev, unsigned int reg)
+{
+ /* all registers after this one are read-only status registers */
+ return reg > LTC4162L_CHARGER_CONFIG_BITS;
+}
+
+static const struct regmap_config ltc4162l_regmap_config = {
+ .reg_bits = 8,
+ .val_bits = 16,
+ .val_format_endian = REGMAP_ENDIAN_LITTLE,
+ .writeable_reg = ltc4162l_is_writeable_reg,
+ .volatile_reg = ltc4162l_is_volatile_reg,
+ .max_register = LTC4162L_INPUT_UNDERVOLTAGE_DAC,
+ .cache_type = REGCACHE_RBTREE,
+};
+
+static void ltc4162l_clear_interrupts(struct ltc4162l_info *info)
+{
+ /* Acknowledge interrupt to chip by clearing all events */
+ regmap_write(info->regmap, LTC4162L_LIMIT_ALERTS_REG, 0);
+ regmap_write(info->regmap, LTC4162L_CHARGER_STATE_ALERTS_REG, 0);
+ regmap_write(info->regmap, LTC4162L_CHARGE_STATUS_ALERTS_REG, 0);
+}
+
+static int ltc4162l_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct i2c_adapter *adapter = client->adapter;
+ struct device *dev = &client->dev;
+ struct ltc4162l_info *info;
+ struct power_supply_config ltc4162l_config = {};
+ u32 value;
+ int ret;
+
+ if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA)) {
+ dev_err(dev, "No support for SMBUS_WORD_DATA\n");
+ return -ENODEV;
+ }
+ info = devm_kzalloc(dev, sizeof(*info), GFP_KERNEL);
+ if (!info)
+ return -ENOMEM;
+
+ info->client = client;
+ i2c_set_clientdata(client, info);
+
+ info->regmap = devm_regmap_init_i2c(client, <c4162l_regmap_config);
+ if (IS_ERR(info->regmap)) {
+ dev_err(dev, "Failed to initialize register map\n");
+ return PTR_ERR(info->regmap);
+ }
+
+ ret = device_property_read_u32(dev, "lltc,rsnsb-micro-ohms",
+ &info->rsnsb);
+ if (ret) {
+ dev_err(dev, "Missing lltc,rsnsb-micro-ohms property\n");
+ return ret;
+ }
+ if (!info->rsnsb)
+ return -EINVAL;
+
+ ret = device_property_read_u32(dev, "lltc,rsnsi-micro-ohms",
+ &info->rsnsi);
+ if (ret) {
+ dev_err(dev, "Missing lltc,rsnsi-micro-ohms property\n");
+ return ret;
+ }
+ if (!info->rsnsi)
+ return -EINVAL;
+
+ if (!device_property_read_u32(dev, "lltc,cell-count", &value))
+ info->cell_count = value;
+
+ ltc4162l_config.of_node = dev->of_node;
+ ltc4162l_config.drv_data = info;
+ ltc4162l_config.attr_grp = ltc4162l_attr_groups;
+
+ info->charger = devm_power_supply_register(dev, <c4162l_desc,
+ <c4162l_config);
+ if (IS_ERR(info->charger)) {
+ dev_err(dev, "Failed to register charger\n");
+ return PTR_ERR(info->charger);
+ }
+
+ /* Disable the threshold alerts, we're not using them */
+ regmap_write(info->regmap, LTC4162L_EN_LIMIT_ALERTS_REG, 0);
+
+ /* Enable interrupts on all status changes */
+ regmap_write(info->regmap, LTC4162L_EN_CHARGER_STATE_ALERTS_REG,
+ 0x1fff);
+ regmap_write(info->regmap, LTC4162L_EN_CHARGE_STATUS_ALERTS_REG, 0x1f);
+
+ ltc4162l_clear_interrupts(info);
+
+ return 0;
+}
+
+static void ltc4162l_alert(struct i2c_client *client,
+ enum i2c_alert_protocol type, unsigned int flag)
+{
+ struct ltc4162l_info *info = i2c_get_clientdata(client);
+
+ if (type != I2C_PROTOCOL_SMBUS_ALERT)
+ return;
+
+ ltc4162l_clear_interrupts(info);
+ power_supply_changed(info->charger);
+}
+
+static const struct i2c_device_id ltc4162l_i2c_id_table[] = {
+ { "ltc4162-l", 0 },
+ { },
+};
+MODULE_DEVICE_TABLE(i2c, ltc4162l_i2c_id_table);
+
+static const struct of_device_id ltc4162l_of_match[] = {
+ { .compatible = "lltc,ltc4162-l", },
+ { },
+};
+MODULE_DEVICE_TABLE(of, ltc4162l_of_match);
+
+static struct i2c_driver ltc4162l_driver = {
+ .probe = ltc4162l_probe,
+ .alert = ltc4162l_alert,
+ .id_table = ltc4162l_i2c_id_table,
+ .driver = {
+ .name = "ltc4162-l-charger",
+ .of_match_table = of_match_ptr(ltc4162l_of_match),
+ },
+};
+module_i2c_driver(ltc4162l_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Mike Looijmans <[email protected]>");
+MODULE_DESCRIPTION("LTC4162-L charger driver");
--
2.17.1
Hi,
On Thu, Jan 07, 2021 at 03:32:48PM +0100, Mike Looijmans wrote:
> Add support for the LTC4162-L Li-Ion battery charger. The driver allows
> reading back telemetry and to set some charging options like the input
> current limit.
>
> Signed-off-by: Mike Looijmans <[email protected]>
> ---
Thanks, queued.
-- Sebastian
> v2: Use microohm units instead of milliohm
> Add interrupt support using smbalert
> Support obtaining cell-count from devicetree
> v3: Fix overflows in calculations involving resistor values
> v4: Use attr_grp member to register attributes
> Report input current/voltage for charger and make battery
> voltage and current into sysfs attributes
> v5: Remove ltc4162l_remove since core now takes care of attributes
> Add ABI documentation for attributes
>
> .../ABI/testing/sysfs-class-power-ltc4162l | 82 ++
> drivers/power/supply/Kconfig | 8 +
> drivers/power/supply/Makefile | 1 +
> drivers/power/supply/ltc4162-l-charger.c | 931 ++++++++++++++++++
> 4 files changed, 1022 insertions(+)
> create mode 100644 Documentation/ABI/testing/sysfs-class-power-ltc4162l
> create mode 100644 drivers/power/supply/ltc4162-l-charger.c
>
> diff --git a/Documentation/ABI/testing/sysfs-class-power-ltc4162l b/Documentation/ABI/testing/sysfs-class-power-ltc4162l
> new file mode 100644
> index 000000000000..ba30db93052b
> --- /dev/null
> +++ b/Documentation/ABI/testing/sysfs-class-power-ltc4162l
> @@ -0,0 +1,82 @@
> +What: /sys/class/power_supply/ltc4162-l/charge_status
> +Date: Januari 2021
> +KernelVersion: 5.11
> +Description:
> + Detailed charge status information as reported by the chip.
> +
> + Access: Read
> +
> + Valid values:
> + ilim_reg_active
> + thermal_reg_active
> + vin_uvcl_active
> + iin_limit_active
> + constant_current
> + constant_voltage
> + charger_off
> +
> +What: /sys/class/power_supply/ltc4162-l/ibat
> +Date: Januari 2021
> +KernelVersion: 5.11
> +Description:
> + Battery input current as measured by the charger. Negative value
> + means that the battery is discharging.
> +
> + Access: Read
> +
> + Valid values: Signed value in microamps
> +
> +What: /sys/class/power_supply/ltc4162-l/vbat
> +Date: Januari 2021
> +KernelVersion: 5.11
> +Description:
> + Battery voltage as measured by the charger.
> +
> + Access: Read
> +
> + Valid values: In microvolts
> +
> +What: /sys/class/power_supply/ltc4162-l/vbat_avg
> +Date: Januari 2021
> +KernelVersion: 5.11
> +Description:
> + Battery voltage, averaged over time, as measured by the charger.
> +
> + Access: Read
> +
> + Valid values: In microvolts
> +
> +What: /sys/class/power_supply/ltc4162-l/force_telemetry
> +Date: Januari 2021
> +KernelVersion: 5.11
> +Description:
> + To save battery current, the measurement system is disabled if
> + the battery is the only source of power. This affects all
> + voltage, current and temperature measurements.
> + Write a "1" to this to keep performing telemetry once every few
> + seconds, even when running on battery (as reported by the online
> + property, which is "1" when external power is available and "0"
> + when the system runs on battery).
> +
> + Access: Read, Write
> +
> + Valid values: 0 (disabled) or 1 (enabled)
> +
> +What: /sys/class/power_supply/ltc4162-l/arm_ship_mode
> +Date: Januari 2021
> +KernelVersion: 5.11
> +Description:
> + The charger will normally drain the battery while inactive,
> + typically drawing about 54 microamps. Write a "1" to this
> + property to arm a special "ship" mode that extends shelf life
> + by reducing the leakage to about 2.8 microamps. The chip will
> + remain in this mode (and no longer respond to I2C commands)
> + until some external power-supply is attached raising the input
> + voltage above 1V. It will then automatically revert to "0".
> + Writing a "0" to the property cancels the "ship" mode request.
> + The ship mode, when armed, activates once the input voltage
> + drops below 1V.
> +
> + Access: Read, Write
> +
> + Valid values: 0 (disable) or 1 (enable)
> diff --git a/drivers/power/supply/Kconfig b/drivers/power/supply/Kconfig
> index eec646c568b7..23000976cb42 100644
> --- a/drivers/power/supply/Kconfig
> +++ b/drivers/power/supply/Kconfig
> @@ -513,6 +513,14 @@ config CHARGER_LT3651
> Say Y to include support for the Analog Devices (Linear Technology)
> LT3651 battery charger which reports its status via GPIO lines.
>
> +config CHARGER_LTC4162L
> + tristate "LTC4162-L charger"
> + depends on I2C
> + select REGMAP_I2C
> + help
> + Say Y to include support for the Analog Devices (Linear Technology)
> + LTC4162-L battery charger connected to I2C.
> +
> config CHARGER_MAX14577
> tristate "Maxim MAX14577/77836 battery charger driver"
> depends on MFD_MAX14577
> diff --git a/drivers/power/supply/Makefile b/drivers/power/supply/Makefile
> index dd4b86318cd9..17b1cf921c44 100644
> --- a/drivers/power/supply/Makefile
> +++ b/drivers/power/supply/Makefile
> @@ -70,6 +70,7 @@ obj-$(CONFIG_CHARGER_LP8788) += lp8788-charger.o
> obj-$(CONFIG_CHARGER_GPIO) += gpio-charger.o
> obj-$(CONFIG_CHARGER_MANAGER) += charger-manager.o
> obj-$(CONFIG_CHARGER_LT3651) += lt3651-charger.o
> +obj-$(CONFIG_CHARGER_LTC4162L) += ltc4162-l-charger.o
> obj-$(CONFIG_CHARGER_MAX14577) += max14577_charger.o
> obj-$(CONFIG_CHARGER_DETECTOR_MAX14656) += max14656_charger_detector.o
> obj-$(CONFIG_CHARGER_MAX77650) += max77650-charger.o
> diff --git a/drivers/power/supply/ltc4162-l-charger.c b/drivers/power/supply/ltc4162-l-charger.c
> new file mode 100644
> index 000000000000..cded6484febb
> --- /dev/null
> +++ b/drivers/power/supply/ltc4162-l-charger.c
> @@ -0,0 +1,931 @@
> +// SPDX-License-Identifier: GPL-2.0-or-later
> +/*
> + * Driver for Analog Devices (Linear Technology) LTC4162-L charger IC.
> + * Copyright (C) 2020, Topic Embedded Products
> + */
> +
> +#include <linux/module.h>
> +#include <linux/delay.h>
> +#include <linux/of_device.h>
> +#include <linux/pm_runtime.h>
> +#include <linux/power_supply.h>
> +#include <linux/i2c.h>
> +#include <linux/regmap.h>
> +
> +/* Registers (names based on what datasheet uses) */
> +#define LTC4162L_EN_LIMIT_ALERTS_REG 0x0D
> +#define LTC4162L_EN_CHARGER_STATE_ALERTS_REG 0x0E
> +#define LTC4162L_EN_CHARGE_STATUS_ALERTS_REG 0x0F
> +#define LTC4162L_CONFIG_BITS_REG 0x14
> +#define LTC4162L_IIN_LIMIT_TARGET 0x15
> +#define LTC4162L_ARM_SHIP_MODE 0x19
> +#define LTC4162L_CHARGE_CURRENT_SETTING 0X1A
> +#define LTC4162L_VCHARGE_SETTING 0X1B
> +#define LTC4162L_C_OVER_X_THRESHOLD 0x1C
> +#define LTC4162L_MAX_CV_TIME 0X1D
> +#define LTC4162L_MAX_CHARGE_TIME 0X1E
> +#define LTC4162L_CHARGER_CONFIG_BITS 0x29
> +#define LTC4162L_CHARGER_STATE 0x34
> +#define LTC4162L_CHARGE_STATUS 0x35
> +#define LTC4162L_LIMIT_ALERTS_REG 0x36
> +#define LTC4162L_CHARGER_STATE_ALERTS_REG 0x37
> +#define LTC4162L_CHARGE_STATUS_ALERTS_REG 0x38
> +#define LTC4162L_SYSTEM_STATUS_REG 0x39
> +#define LTC4162L_VBAT 0x3A
> +#define LTC4162L_VIN 0x3B
> +#define LTC4162L_VOUT 0x3C
> +#define LTC4162L_IBAT 0x3D
> +#define LTC4162L_IIN 0x3E
> +#define LTC4162L_DIE_TEMPERATURE 0x3F
> +#define LTC4162L_THERMISTOR_VOLTAGE 0x40
> +#define LTC4162L_BSR 0x41
> +#define LTC4162L_JEITA_REGION 0x42
> +#define LTC4162L_CHEM_CELLS_REG 0x43
> +#define LTC4162L_ICHARGE_DAC 0x44
> +#define LTC4162L_VCHARGE_DAC 0x45
> +#define LTC4162L_IIN_LIMIT_DAC 0x46
> +#define LTC4162L_VBAT_FILT 0x47
> +#define LTC4162L_INPUT_UNDERVOLTAGE_DAC 0x4B
> +
> +/* Enumeration as in datasheet. Individual bits are mutually exclusive. */
> +enum ltc4162l_state {
> + battery_detection = 2048,
> + charger_suspended = 256,
> + precharge = 128, /* trickle on low bat voltage */
> + cc_cv_charge = 64, /* normal charge */
> + ntc_pause = 32,
> + timer_term = 16,
> + c_over_x_term = 8, /* battery is full */
> + max_charge_time_fault = 4,
> + bat_missing_fault = 2,
> + bat_short_fault = 1
> +};
> +
> +/* Individual bits are mutually exclusive. Only active in charging states.*/
> +enum ltc4162l_charge_status {
> + ilim_reg_active = 32,
> + thermal_reg_active = 16,
> + vin_uvcl_active = 8,
> + iin_limit_active = 4,
> + constant_current = 2,
> + constant_voltage = 1,
> + charger_off = 0
> +};
> +
> +/* Magic number to write to ARM_SHIP_MODE register */
> +#define LTC4162L_ARM_SHIP_MODE_MAGIC 21325
> +
> +struct ltc4162l_info {
> + struct i2c_client *client;
> + struct regmap *regmap;
> + struct power_supply *charger;
> + u32 rsnsb; /* Series resistor that sets charge current, microOhm */
> + u32 rsnsi; /* Series resistor to measure input current, microOhm */
> + u8 cell_count; /* Number of connected cells, 0 while unknown */
> +};
> +
> +static u8 ltc4162l_get_cell_count(struct ltc4162l_info *info)
> +{
> + int ret;
> + unsigned int val;
> +
> + /* Once read successfully */
> + if (info->cell_count)
> + return info->cell_count;
> +
> + ret = regmap_read(info->regmap, LTC4162L_CHEM_CELLS_REG, &val);
> + if (ret)
> + return 0;
> +
> + /* Lower 4 bits is the cell count, or 0 if the chip doesn't know yet */
> + val &= 0x0f;
> + if (!val)
> + return 0;
> +
> + /* Once determined, keep the value */
> + info->cell_count = val;
> +
> + return val;
> +};
> +
> +/* Convert enum value to POWER_SUPPLY_STATUS value */
> +static int ltc4162l_state_decode(enum ltc4162l_state value)
> +{
> + switch (value) {
> + case precharge:
> + case cc_cv_charge:
> + return POWER_SUPPLY_STATUS_CHARGING;
> + case c_over_x_term:
> + return POWER_SUPPLY_STATUS_FULL;
> + case bat_missing_fault:
> + case bat_short_fault:
> + return POWER_SUPPLY_STATUS_UNKNOWN;
> + default:
> + return POWER_SUPPLY_STATUS_NOT_CHARGING;
> + }
> +};
> +
> +static int ltc4162l_get_status(struct ltc4162l_info *info,
> + union power_supply_propval *val)
> +{
> + unsigned int regval;
> + int ret;
> +
> + ret = regmap_read(info->regmap, LTC4162L_CHARGER_STATE, ®val);
> + if (ret) {
> + dev_err(&info->client->dev, "Failed to read CHARGER_STATE\n");
> + return ret;
> + }
> +
> + val->intval = ltc4162l_state_decode(regval);
> +
> + return 0;
> +}
> +
> +static int ltc4162l_charge_status_decode(enum ltc4162l_charge_status value)
> +{
> + if (!value)
> + return POWER_SUPPLY_CHARGE_TYPE_NONE;
> +
> + /* constant voltage/current and input_current limit are "fast" modes */
> + if (value <= iin_limit_active)
> + return POWER_SUPPLY_CHARGE_TYPE_FAST;
> +
> + /* Anything that's not fast we'll return as trickle */
> + return POWER_SUPPLY_CHARGE_TYPE_TRICKLE;
> +}
> +
> +static int ltc4162l_get_charge_type(struct ltc4162l_info *info,
> + union power_supply_propval *val)
> +{
> + unsigned int regval;
> + int ret;
> +
> + ret = regmap_read(info->regmap, LTC4162L_CHARGE_STATUS, ®val);
> + if (ret)
> + return ret;
> +
> + val->intval = ltc4162l_charge_status_decode(regval);
> +
> + return 0;
> +}
> +
> +static int ltc4162l_state_to_health(enum ltc4162l_state value)
> +{
> + switch (value) {
> + case ntc_pause:
> + return POWER_SUPPLY_HEALTH_OVERHEAT;
> + case timer_term:
> + return POWER_SUPPLY_HEALTH_SAFETY_TIMER_EXPIRE;
> + case max_charge_time_fault:
> + return POWER_SUPPLY_HEALTH_WATCHDOG_TIMER_EXPIRE;
> + case bat_missing_fault:
> + return POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
> + case bat_short_fault:
> + return POWER_SUPPLY_HEALTH_DEAD;
> + default:
> + return POWER_SUPPLY_HEALTH_GOOD;
> + }
> +}
> +
> +static int ltc4162l_get_health(struct ltc4162l_info *info,
> + union power_supply_propval *val)
> +{
> + unsigned int regval;
> + int ret;
> +
> + ret = regmap_read(info->regmap, LTC4162L_CHARGER_STATE, ®val);
> + if (ret)
> + return ret;
> +
> + val->intval = ltc4162l_state_to_health(regval);
> +
> + return 0;
> +}
> +
> +static int ltc4162l_get_online(struct ltc4162l_info *info,
> + union power_supply_propval *val)
> +{
> + unsigned int regval;
> + int ret;
> +
> + ret = regmap_read(info->regmap, LTC4162L_SYSTEM_STATUS_REG, ®val);
> + if (ret)
> + return ret;
> +
> + /* BIT(2) indicates if input voltage is sufficient to charge */
> + val->intval = !!(regval & BIT(2));
> +
> + return 0;
> +}
> +
> +static int ltc4162l_get_vbat(struct ltc4162l_info *info,
> + unsigned int reg,
> + union power_supply_propval *val)
> +{
> + unsigned int regval;
> + int ret;
> +
> + ret = regmap_read(info->regmap, reg, ®val);
> + if (ret)
> + return ret;
> +
> + /* cell_count × 192.4μV/LSB */
> + regval *= 1924;
> + regval *= ltc4162l_get_cell_count(info);
> + regval /= 10;
> + val->intval = regval;
> +
> + return 0;
> +}
> +
> +static int ltc4162l_get_ibat(struct ltc4162l_info *info,
> + union power_supply_propval *val)
> +{
> + unsigned int regval;
> + int ret;
> +
> + ret = regmap_read(info->regmap, LTC4162L_IBAT, ®val);
> + if (ret)
> + return ret;
> +
> + /* Signed 16-bit number, 1.466μV / RSNSB amperes/LSB. */
> + ret = (s16)(regval & 0xFFFF);
> + val->intval = 100 * mult_frac(ret, 14660, (int)info->rsnsb);
> +
> + return 0;
> +}
> +
> +
> +static int ltc4162l_get_input_voltage(struct ltc4162l_info *info,
> + union power_supply_propval *val)
> +{
> + unsigned int regval;
> + int ret;
> +
> + ret = regmap_read(info->regmap, LTC4162L_VIN, ®val);
> + if (ret)
> + return ret;
> +
> + /* 1.649mV/LSB */
> + val->intval = regval * 1694;
> +
> + return 0;
> +}
> +
> +static int ltc4162l_get_input_current(struct ltc4162l_info *info,
> + union power_supply_propval *val)
> +{
> + unsigned int regval;
> + int ret;
> +
> + ret = regmap_read(info->regmap, LTC4162L_IIN, ®val);
> + if (ret)
> + return ret;
> +
> + /* Signed 16-bit number, 1.466μV / RSNSI amperes/LSB. */
> + ret = (s16)(regval & 0xFFFF);
> + ret *= 14660;
> + ret /= info->rsnsi;
> + ret *= 100;
> +
> + val->intval = ret;
> +
> + return 0;
> +}
> +
> +static int ltc4162l_get_icharge(struct ltc4162l_info *info,
> + unsigned int reg,
> + union power_supply_propval *val)
> +{
> + unsigned int regval;
> + int ret;
> +
> + ret = regmap_read(info->regmap, reg, ®val);
> + if (ret)
> + return ret;
> +
> + regval &= BIT(6) - 1; /* Only the lower 5 bits */
> +
> + /* The charge current servo level: (icharge_dac + 1) × 1mV/RSNSB */
> + ++regval;
> + val->intval = 10000u * mult_frac(regval, 100000u, info->rsnsb);
> +
> + return 0;
> +}
> +
> +static int ltc4162l_set_icharge(struct ltc4162l_info *info,
> + unsigned int reg,
> + unsigned int value)
> +{
> + value = mult_frac(value, info->rsnsb, 100000u);
> + value /= 10000u;
> +
> + /* Round to lowest possible */
> + if (value)
> + --value;
> +
> + if (value > 31)
> + return -EINVAL;
> +
> + return regmap_write(info->regmap, reg, value);
> +}
> +
> +
> +static int ltc4162l_get_vcharge(struct ltc4162l_info *info,
> + unsigned int reg,
> + union power_supply_propval *val)
> +{
> + unsigned int regval;
> + int ret;
> + u32 voltage;
> +
> + ret = regmap_read(info->regmap, reg, ®val);
> + if (ret)
> + return ret;
> +
> + regval &= BIT(6) - 1; /* Only the lower 5 bits */
> +
> + /*
> + * charge voltage setting can be computed from
> + * cell_count × (vcharge_setting × 12.5mV + 3.8125V)
> + * where vcharge_setting ranges from 0 to 31 (4.2V max).
> + */
> + voltage = 3812500 + (regval * 12500);
> + voltage *= ltc4162l_get_cell_count(info);
> + val->intval = voltage;
> +
> + return 0;
> +}
> +
> +static int ltc4162l_set_vcharge(struct ltc4162l_info *info,
> + unsigned int reg,
> + unsigned int value)
> +{
> + u8 cell_count = ltc4162l_get_cell_count(info);
> +
> + if (!cell_count)
> + return -EBUSY; /* Not available yet, try again later */
> +
> + value /= cell_count;
> +
> + if (value < 3812500)
> + return -EINVAL;
> +
> + value -= 3812500;
> + value /= 12500;
> +
> + if (value > 31)
> + return -EINVAL;
> +
> + return regmap_write(info->regmap, reg, value);
> +}
> +
> +static int ltc4162l_get_iin_limit_dac(struct ltc4162l_info *info,
> + union power_supply_propval *val)
> +{
> + unsigned int regval;
> + int ret;
> +
> + ret = regmap_read(info->regmap, LTC4162L_IIN_LIMIT_DAC, ®val);
> + if (ret)
> + return ret;
> +
> + regval &= BIT(6) - 1; /* Only 6 bits */
> +
> + /* (iin_limit_dac + 1) × 500μV / RSNSI */
> + ++regval;
> + regval *= 5000000u;
> + regval /= info->rsnsi;
> + val->intval = 100u * regval;
> +
> + return 0;
> +}
> +
> +static int ltc4162l_set_iin_limit(struct ltc4162l_info *info,
> + unsigned int value)
> +{
> + unsigned int regval;
> +
> + regval = mult_frac(value, info->rsnsi, 50000u);
> + regval /= 10000u;
> + if (regval)
> + --regval;
> + if (regval > 63)
> + regval = 63;
> +
> + return regmap_write(info->regmap, LTC4162L_IIN_LIMIT_TARGET, regval);
> +}
> +
> +static int ltc4162l_get_die_temp(struct ltc4162l_info *info,
> + union power_supply_propval *val)
> +{
> + unsigned int regval;
> + int ret;
> +
> + ret = regmap_read(info->regmap, LTC4162L_DIE_TEMPERATURE, ®val);
> + if (ret)
> + return ret;
> +
> + /* die_temp × 0.0215°C/LSB - 264.4°C */
> + ret = (s16)(regval & 0xFFFF);
> + ret *= 215;
> + ret /= 100; /* Centidegrees scale */
> + ret -= 26440;
> + val->intval = ret;
> +
> + return 0;
> +}
> +
> +static int ltc4162l_get_term_current(struct ltc4162l_info *info,
> + union power_supply_propval *val)
> +{
> + unsigned int regval;
> + int ret;
> +
> + ret = regmap_read(info->regmap, LTC4162L_CHARGER_CONFIG_BITS, ®val);
> + if (ret)
> + return ret;
> +
> + /* Check if C_OVER_X_THRESHOLD is enabled */
> + if (!(regval & BIT(2))) {
> + val->intval = 0;
> + return 0;
> + }
> +
> + ret = regmap_read(info->regmap, LTC4162L_C_OVER_X_THRESHOLD, ®val);
> + if (ret)
> + return ret;
> +
> + /* 1.466μV / RSNSB amperes/LSB */
> + regval *= 14660u;
> + regval /= info->rsnsb;
> + val->intval = 100 * regval;
> +
> + return 0;
> +}
> +
> +static int ltc4162l_set_term_current(struct ltc4162l_info *info,
> + unsigned int value)
> +{
> + int ret;
> + unsigned int regval;
> +
> + if (!value) {
> + /* Disable en_c_over_x_term when set to zero */
> + return regmap_update_bits(info->regmap,
> + LTC4162L_CHARGER_CONFIG_BITS,
> + BIT(2), 0);
> + }
> +
> + regval = mult_frac(value, info->rsnsb, 14660u);
> + regval /= 100u;
> +
> + ret = regmap_write(info->regmap, LTC4162L_C_OVER_X_THRESHOLD, regval);
> + if (ret)
> + return ret;
> +
> + /* Set en_c_over_x_term after changing the threshold value */
> + return regmap_update_bits(info->regmap, LTC4162L_CHARGER_CONFIG_BITS,
> + BIT(2), BIT(2));
> +}
> +
> +/* Custom properties */
> +static const char * const ltc4162l_charge_status_name[] = {
> + "ilim_reg_active", /* 32 */
> + "thermal_reg_active",
> + "vin_uvcl_active",
> + "iin_limit_active",
> + "constant_current",
> + "constant_voltage",
> + "charger_off" /* 0 */
> +};
> +
> +static ssize_t charge_status_show(struct device *dev,
> + struct device_attribute *attr, char *buf)
> +{
> + struct power_supply *psy = to_power_supply(dev);
> + struct ltc4162l_info *info = power_supply_get_drvdata(psy);
> + const char *result = ltc4162l_charge_status_name[
> + ARRAY_SIZE(ltc4162l_charge_status_name) - 1];
> + unsigned int regval;
> + unsigned int mask;
> + unsigned int index;
> + int ret;
> +
> + ret = regmap_read(info->regmap, LTC4162L_CHARGE_STATUS, ®val);
> + if (ret)
> + return ret;
> +
> + /* Only one bit is set according to datasheet, let's be safe here */
> + for (mask = 32, index = 0; mask != 0; mask >>= 1, ++index) {
> + if (regval & mask) {
> + result = ltc4162l_charge_status_name[index];
> + break;
> + }
> + }
> +
> + return sprintf(buf, "%s\n", result);
> +}
> +static DEVICE_ATTR_RO(charge_status);
> +
> +static ssize_t vbat_show(struct device *dev,
> + struct device_attribute *attr, char *buf)
> +{
> + struct power_supply *psy = to_power_supply(dev);
> + struct ltc4162l_info *info = power_supply_get_drvdata(psy);
> + union power_supply_propval val;
> + int ret;
> +
> + ret = ltc4162l_get_vbat(info, LTC4162L_VBAT, &val);
> + if (ret)
> + return ret;
> +
> + return sprintf(buf, "%d\n", val.intval);
> +}
> +static DEVICE_ATTR_RO(vbat);
> +
> +static ssize_t vbat_avg_show(struct device *dev,
> + struct device_attribute *attr, char *buf)
> +{
> + struct power_supply *psy = to_power_supply(dev);
> + struct ltc4162l_info *info = power_supply_get_drvdata(psy);
> + union power_supply_propval val;
> + int ret;
> +
> + ret = ltc4162l_get_vbat(info, LTC4162L_VBAT_FILT, &val);
> + if (ret)
> + return ret;
> +
> + return sprintf(buf, "%d\n", val.intval);
> +}
> +static DEVICE_ATTR_RO(vbat_avg);
> +
> +static ssize_t ibat_show(struct device *dev,
> + struct device_attribute *attr, char *buf)
> +{
> + struct power_supply *psy = to_power_supply(dev);
> + struct ltc4162l_info *info = power_supply_get_drvdata(psy);
> + union power_supply_propval val;
> + int ret;
> +
> + ret = ltc4162l_get_ibat(info, &val);
> + if (ret)
> + return ret;
> +
> + return sprintf(buf, "%d\n", val.intval);
> +}
> +static DEVICE_ATTR_RO(ibat);
> +
> +static ssize_t force_telemetry_show(struct device *dev,
> + struct device_attribute *attr, char *buf)
> +{
> + struct power_supply *psy = to_power_supply(dev);
> + struct ltc4162l_info *info = power_supply_get_drvdata(psy);
> + unsigned int regval;
> + int ret;
> +
> + ret = regmap_read(info->regmap, LTC4162L_CONFIG_BITS_REG, ®val);
> + if (ret)
> + return ret;
> +
> + return sprintf(buf, "%u\n", regval & BIT(2) ? 1 : 0);
> +}
> +
> +static ssize_t force_telemetry_store(struct device *dev,
> + struct device_attribute *attr,
> + const char *buf,
> + size_t count)
> +{
> + struct power_supply *psy = to_power_supply(dev);
> + struct ltc4162l_info *info = power_supply_get_drvdata(psy);
> + int ret;
> + unsigned int value;
> +
> + ret = kstrtouint(buf, 0, &value);
> + if (ret < 0)
> + return ret;
> +
> + ret = regmap_update_bits(info->regmap, LTC4162L_CONFIG_BITS_REG,
> + BIT(2), value ? BIT(2) : 0);
> + if (ret < 0)
> + return ret;
> +
> + return count;
> +}
> +
> +static DEVICE_ATTR_RW(force_telemetry);
> +
> +static ssize_t arm_ship_mode_show(struct device *dev,
> + struct device_attribute *attr, char *buf)
> +{
> + struct power_supply *psy = to_power_supply(dev);
> + struct ltc4162l_info *info = power_supply_get_drvdata(psy);
> + unsigned int regval;
> + int ret;
> +
> + ret = regmap_read(info->regmap, LTC4162L_ARM_SHIP_MODE, ®val);
> + if (ret)
> + return ret;
> +
> + return sprintf(buf, "%u\n",
> + regval == LTC4162L_ARM_SHIP_MODE_MAGIC ? 1 : 0);
> +}
> +
> +static ssize_t arm_ship_mode_store(struct device *dev,
> + struct device_attribute *attr,
> + const char *buf,
> + size_t count)
> +{
> + struct power_supply *psy = to_power_supply(dev);
> + struct ltc4162l_info *info = power_supply_get_drvdata(psy);
> + int ret;
> + unsigned int value;
> +
> + ret = kstrtouint(buf, 0, &value);
> + if (ret < 0)
> + return ret;
> +
> + ret = regmap_write(info->regmap, LTC4162L_ARM_SHIP_MODE,
> + value ? LTC4162L_ARM_SHIP_MODE_MAGIC : 0);
> + if (ret < 0)
> + return ret;
> +
> + return count;
> +}
> +
> +static DEVICE_ATTR_RW(arm_ship_mode);
> +
> +static struct attribute *ltc4162l_sysfs_entries[] = {
> + &dev_attr_charge_status.attr,
> + &dev_attr_ibat.attr,
> + &dev_attr_vbat.attr,
> + &dev_attr_vbat_avg.attr,
> + &dev_attr_force_telemetry.attr,
> + &dev_attr_arm_ship_mode.attr,
> + NULL,
> +};
> +
> +static struct attribute_group ltc4162l_attr_group = {
> + .name = NULL, /* put in device directory */
> + .attrs = ltc4162l_sysfs_entries,
> +};
> +
> +static const struct attribute_group *ltc4162l_attr_groups[] = {
> + <c4162l_attr_group,
> + NULL,
> +};
> +
> +static int ltc4162l_get_property(struct power_supply *psy,
> + enum power_supply_property psp,
> + union power_supply_propval *val)
> +{
> + struct ltc4162l_info *info = power_supply_get_drvdata(psy);
> +
> + switch (psp) {
> + case POWER_SUPPLY_PROP_STATUS:
> + return ltc4162l_get_status(info, val);
> + case POWER_SUPPLY_PROP_CHARGE_TYPE:
> + return ltc4162l_get_charge_type(info, val);
> + case POWER_SUPPLY_PROP_HEALTH:
> + return ltc4162l_get_health(info, val);
> + case POWER_SUPPLY_PROP_ONLINE:
> + return ltc4162l_get_online(info, val);
> + case POWER_SUPPLY_PROP_VOLTAGE_NOW:
> + return ltc4162l_get_input_voltage(info, val);
> + case POWER_SUPPLY_PROP_CURRENT_NOW:
> + return ltc4162l_get_input_current(info, val);
> + case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
> + return ltc4162l_get_icharge(info,
> + LTC4162L_ICHARGE_DAC, val);
> + case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX:
> + return ltc4162l_get_icharge(info,
> + LTC4162L_CHARGE_CURRENT_SETTING, val);
> + case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
> + return ltc4162l_get_vcharge(info,
> + LTC4162L_VCHARGE_DAC, val);
> + case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX:
> + return ltc4162l_get_vcharge(info,
> + LTC4162L_VCHARGE_SETTING, val);
> + case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
> + return ltc4162l_get_iin_limit_dac(info, val);
> + case POWER_SUPPLY_PROP_TEMP:
> + return ltc4162l_get_die_temp(info, val);
> + case POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT:
> + return ltc4162l_get_term_current(info, val);
> + default:
> + return -EINVAL;
> + }
> +}
> +
> +static int ltc4162l_set_property(struct power_supply *psy,
> + enum power_supply_property psp,
> + const union power_supply_propval *val)
> +{
> + struct ltc4162l_info *info = power_supply_get_drvdata(psy);
> +
> + switch (psp) {
> + case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX:
> + return ltc4162l_set_icharge(info,
> + LTC4162L_CHARGE_CURRENT_SETTING, val->intval);
> + case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX:
> + return ltc4162l_set_vcharge(info,
> + LTC4162L_VCHARGE_SETTING, val->intval);
> + case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
> + return ltc4162l_set_iin_limit(info, val->intval);
> + case POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT:
> + return ltc4162l_set_term_current(info, val->intval);
> + default:
> + return -EINVAL;
> + }
> +}
> +
> +static int ltc4162l_property_is_writeable(struct power_supply *psy,
> + enum power_supply_property psp)
> +{
> + switch (psp) {
> + case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX:
> + case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX:
> + case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
> + case POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT:
> + return 1;
> + default:
> + return 0;
> + }
> +}
> +
> +/* Charger power supply property routines */
> +static enum power_supply_property ltc4162l_properties[] = {
> + POWER_SUPPLY_PROP_STATUS,
> + POWER_SUPPLY_PROP_CHARGE_TYPE,
> + POWER_SUPPLY_PROP_HEALTH,
> + POWER_SUPPLY_PROP_ONLINE,
> + POWER_SUPPLY_PROP_VOLTAGE_NOW,
> + POWER_SUPPLY_PROP_CURRENT_NOW,
> + 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_TEMP,
> + POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT,
> +};
> +
> +static const struct power_supply_desc ltc4162l_desc = {
> + .name = "ltc4162-l",
> + .type = POWER_SUPPLY_TYPE_MAINS,
> + .properties = ltc4162l_properties,
> + .num_properties = ARRAY_SIZE(ltc4162l_properties),
> + .get_property = ltc4162l_get_property,
> + .set_property = ltc4162l_set_property,
> + .property_is_writeable = ltc4162l_property_is_writeable,
> +};
> +
> +static bool ltc4162l_is_writeable_reg(struct device *dev, unsigned int reg)
> +{
> + /* all registers up to this one are writeable */
> + if (reg <= LTC4162L_CHARGER_CONFIG_BITS)
> + return true;
> +
> + /* The ALERTS registers can be written to clear alerts */
> + if (reg >= LTC4162L_LIMIT_ALERTS_REG &&
> + reg <= LTC4162L_CHARGE_STATUS_ALERTS_REG)
> + return true;
> +
> + return false;
> +}
> +
> +static bool ltc4162l_is_volatile_reg(struct device *dev, unsigned int reg)
> +{
> + /* all registers after this one are read-only status registers */
> + return reg > LTC4162L_CHARGER_CONFIG_BITS;
> +}
> +
> +static const struct regmap_config ltc4162l_regmap_config = {
> + .reg_bits = 8,
> + .val_bits = 16,
> + .val_format_endian = REGMAP_ENDIAN_LITTLE,
> + .writeable_reg = ltc4162l_is_writeable_reg,
> + .volatile_reg = ltc4162l_is_volatile_reg,
> + .max_register = LTC4162L_INPUT_UNDERVOLTAGE_DAC,
> + .cache_type = REGCACHE_RBTREE,
> +};
> +
> +static void ltc4162l_clear_interrupts(struct ltc4162l_info *info)
> +{
> + /* Acknowledge interrupt to chip by clearing all events */
> + regmap_write(info->regmap, LTC4162L_LIMIT_ALERTS_REG, 0);
> + regmap_write(info->regmap, LTC4162L_CHARGER_STATE_ALERTS_REG, 0);
> + regmap_write(info->regmap, LTC4162L_CHARGE_STATUS_ALERTS_REG, 0);
> +}
> +
> +static int ltc4162l_probe(struct i2c_client *client,
> + const struct i2c_device_id *id)
> +{
> + struct i2c_adapter *adapter = client->adapter;
> + struct device *dev = &client->dev;
> + struct ltc4162l_info *info;
> + struct power_supply_config ltc4162l_config = {};
> + u32 value;
> + int ret;
> +
> + if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA)) {
> + dev_err(dev, "No support for SMBUS_WORD_DATA\n");
> + return -ENODEV;
> + }
> + info = devm_kzalloc(dev, sizeof(*info), GFP_KERNEL);
> + if (!info)
> + return -ENOMEM;
> +
> + info->client = client;
> + i2c_set_clientdata(client, info);
> +
> + info->regmap = devm_regmap_init_i2c(client, <c4162l_regmap_config);
> + if (IS_ERR(info->regmap)) {
> + dev_err(dev, "Failed to initialize register map\n");
> + return PTR_ERR(info->regmap);
> + }
> +
> + ret = device_property_read_u32(dev, "lltc,rsnsb-micro-ohms",
> + &info->rsnsb);
> + if (ret) {
> + dev_err(dev, "Missing lltc,rsnsb-micro-ohms property\n");
> + return ret;
> + }
> + if (!info->rsnsb)
> + return -EINVAL;
> +
> + ret = device_property_read_u32(dev, "lltc,rsnsi-micro-ohms",
> + &info->rsnsi);
> + if (ret) {
> + dev_err(dev, "Missing lltc,rsnsi-micro-ohms property\n");
> + return ret;
> + }
> + if (!info->rsnsi)
> + return -EINVAL;
> +
> + if (!device_property_read_u32(dev, "lltc,cell-count", &value))
> + info->cell_count = value;
> +
> + ltc4162l_config.of_node = dev->of_node;
> + ltc4162l_config.drv_data = info;
> + ltc4162l_config.attr_grp = ltc4162l_attr_groups;
> +
> + info->charger = devm_power_supply_register(dev, <c4162l_desc,
> + <c4162l_config);
> + if (IS_ERR(info->charger)) {
> + dev_err(dev, "Failed to register charger\n");
> + return PTR_ERR(info->charger);
> + }
> +
> + /* Disable the threshold alerts, we're not using them */
> + regmap_write(info->regmap, LTC4162L_EN_LIMIT_ALERTS_REG, 0);
> +
> + /* Enable interrupts on all status changes */
> + regmap_write(info->regmap, LTC4162L_EN_CHARGER_STATE_ALERTS_REG,
> + 0x1fff);
> + regmap_write(info->regmap, LTC4162L_EN_CHARGE_STATUS_ALERTS_REG, 0x1f);
> +
> + ltc4162l_clear_interrupts(info);
> +
> + return 0;
> +}
> +
> +static void ltc4162l_alert(struct i2c_client *client,
> + enum i2c_alert_protocol type, unsigned int flag)
> +{
> + struct ltc4162l_info *info = i2c_get_clientdata(client);
> +
> + if (type != I2C_PROTOCOL_SMBUS_ALERT)
> + return;
> +
> + ltc4162l_clear_interrupts(info);
> + power_supply_changed(info->charger);
> +}
> +
> +static const struct i2c_device_id ltc4162l_i2c_id_table[] = {
> + { "ltc4162-l", 0 },
> + { },
> +};
> +MODULE_DEVICE_TABLE(i2c, ltc4162l_i2c_id_table);
> +
> +static const struct of_device_id ltc4162l_of_match[] = {
> + { .compatible = "lltc,ltc4162-l", },
> + { },
> +};
> +MODULE_DEVICE_TABLE(of, ltc4162l_of_match);
> +
> +static struct i2c_driver ltc4162l_driver = {
> + .probe = ltc4162l_probe,
> + .alert = ltc4162l_alert,
> + .id_table = ltc4162l_i2c_id_table,
> + .driver = {
> + .name = "ltc4162-l-charger",
> + .of_match_table = of_match_ptr(ltc4162l_of_match),
> + },
> +};
> +module_i2c_driver(ltc4162l_driver);
> +
> +MODULE_LICENSE("GPL");
> +MODULE_AUTHOR("Mike Looijmans <[email protected]>");
> +MODULE_DESCRIPTION("LTC4162-L charger driver");
> --
> 2.17.1
>