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-rw-r--r--drivers/power/supply/sbs-battery.c1294
1 files changed, 1294 insertions, 0 deletions
diff --git a/drivers/power/supply/sbs-battery.c b/drivers/power/supply/sbs-battery.c
new file mode 100644
index 000000000..c4a95b014
--- /dev/null
+++ b/drivers/power/supply/sbs-battery.c
@@ -0,0 +1,1294 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Gas Gauge driver for SBS Compliant Batteries
+ *
+ * Copyright (c) 2010, NVIDIA Corporation.
+ */
+
+#include <linux/bits.h>
+#include <linux/delay.h>
+#include <linux/devm-helpers.h>
+#include <linux/err.h>
+#include <linux/gpio/consumer.h>
+#include <linux/i2c.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/property.h>
+#include <linux/of_device.h>
+#include <linux/power/sbs-battery.h>
+#include <linux/power_supply.h>
+#include <linux/slab.h>
+#include <linux/stat.h>
+
+enum {
+ REG_MANUFACTURER_DATA,
+ REG_BATTERY_MODE,
+ REG_TEMPERATURE,
+ REG_VOLTAGE,
+ REG_CURRENT_NOW,
+ REG_CURRENT_AVG,
+ REG_MAX_ERR,
+ REG_CAPACITY,
+ REG_TIME_TO_EMPTY_NOW,
+ REG_TIME_TO_EMPTY_AVG,
+ REG_TIME_TO_FULL_AVG,
+ REG_STATUS,
+ REG_CAPACITY_LEVEL,
+ REG_CYCLE_COUNT,
+ REG_SERIAL_NUMBER,
+ REG_REMAINING_CAPACITY,
+ REG_REMAINING_CAPACITY_CHARGE,
+ REG_FULL_CHARGE_CAPACITY,
+ REG_FULL_CHARGE_CAPACITY_CHARGE,
+ REG_DESIGN_CAPACITY,
+ REG_DESIGN_CAPACITY_CHARGE,
+ REG_DESIGN_VOLTAGE_MIN,
+ REG_DESIGN_VOLTAGE_MAX,
+ REG_CHEMISTRY,
+ REG_MANUFACTURER,
+ REG_MODEL_NAME,
+ REG_CHARGE_CURRENT,
+ REG_CHARGE_VOLTAGE,
+};
+
+#define REG_ADDR_SPEC_INFO 0x1A
+#define SPEC_INFO_VERSION_MASK GENMASK(7, 4)
+#define SPEC_INFO_VERSION_SHIFT 4
+
+#define SBS_VERSION_1_0 1
+#define SBS_VERSION_1_1 2
+#define SBS_VERSION_1_1_WITH_PEC 3
+
+#define REG_ADDR_MANUFACTURE_DATE 0x1B
+
+/* Battery Mode defines */
+#define BATTERY_MODE_OFFSET 0x03
+#define BATTERY_MODE_CAPACITY_MASK BIT(15)
+enum sbs_capacity_mode {
+ CAPACITY_MODE_AMPS = 0,
+ CAPACITY_MODE_WATTS = BATTERY_MODE_CAPACITY_MASK
+};
+#define BATTERY_MODE_CHARGER_MASK (1<<14)
+
+/* manufacturer access defines */
+#define MANUFACTURER_ACCESS_STATUS 0x0006
+#define MANUFACTURER_ACCESS_SLEEP 0x0011
+
+/* battery status value bits */
+#define BATTERY_INITIALIZED 0x80
+#define BATTERY_DISCHARGING 0x40
+#define BATTERY_FULL_CHARGED 0x20
+#define BATTERY_FULL_DISCHARGED 0x10
+
+/* min_value and max_value are only valid for numerical data */
+#define SBS_DATA(_psp, _addr, _min_value, _max_value) { \
+ .psp = _psp, \
+ .addr = _addr, \
+ .min_value = _min_value, \
+ .max_value = _max_value, \
+}
+
+static const struct chip_data {
+ enum power_supply_property psp;
+ u8 addr;
+ int min_value;
+ int max_value;
+} sbs_data[] = {
+ [REG_MANUFACTURER_DATA] =
+ SBS_DATA(POWER_SUPPLY_PROP_PRESENT, 0x00, 0, 65535),
+ [REG_BATTERY_MODE] =
+ SBS_DATA(-1, 0x03, 0, 65535),
+ [REG_TEMPERATURE] =
+ SBS_DATA(POWER_SUPPLY_PROP_TEMP, 0x08, 0, 65535),
+ [REG_VOLTAGE] =
+ SBS_DATA(POWER_SUPPLY_PROP_VOLTAGE_NOW, 0x09, 0, 65535),
+ [REG_CURRENT_NOW] =
+ SBS_DATA(POWER_SUPPLY_PROP_CURRENT_NOW, 0x0A, -32768, 32767),
+ [REG_CURRENT_AVG] =
+ SBS_DATA(POWER_SUPPLY_PROP_CURRENT_AVG, 0x0B, -32768, 32767),
+ [REG_MAX_ERR] =
+ SBS_DATA(POWER_SUPPLY_PROP_CAPACITY_ERROR_MARGIN, 0x0c, 0, 100),
+ [REG_CAPACITY] =
+ SBS_DATA(POWER_SUPPLY_PROP_CAPACITY, 0x0D, 0, 100),
+ [REG_REMAINING_CAPACITY] =
+ SBS_DATA(POWER_SUPPLY_PROP_ENERGY_NOW, 0x0F, 0, 65535),
+ [REG_REMAINING_CAPACITY_CHARGE] =
+ SBS_DATA(POWER_SUPPLY_PROP_CHARGE_NOW, 0x0F, 0, 65535),
+ [REG_FULL_CHARGE_CAPACITY] =
+ SBS_DATA(POWER_SUPPLY_PROP_ENERGY_FULL, 0x10, 0, 65535),
+ [REG_FULL_CHARGE_CAPACITY_CHARGE] =
+ SBS_DATA(POWER_SUPPLY_PROP_CHARGE_FULL, 0x10, 0, 65535),
+ [REG_TIME_TO_EMPTY_NOW] =
+ SBS_DATA(POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW, 0x11, 0, 65535),
+ [REG_TIME_TO_EMPTY_AVG] =
+ SBS_DATA(POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG, 0x12, 0, 65535),
+ [REG_TIME_TO_FULL_AVG] =
+ SBS_DATA(POWER_SUPPLY_PROP_TIME_TO_FULL_AVG, 0x13, 0, 65535),
+ [REG_CHARGE_CURRENT] =
+ SBS_DATA(POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX, 0x14, 0, 65535),
+ [REG_CHARGE_VOLTAGE] =
+ SBS_DATA(POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX, 0x15, 0, 65535),
+ [REG_STATUS] =
+ SBS_DATA(POWER_SUPPLY_PROP_STATUS, 0x16, 0, 65535),
+ [REG_CAPACITY_LEVEL] =
+ SBS_DATA(POWER_SUPPLY_PROP_CAPACITY_LEVEL, 0x16, 0, 65535),
+ [REG_CYCLE_COUNT] =
+ SBS_DATA(POWER_SUPPLY_PROP_CYCLE_COUNT, 0x17, 0, 65535),
+ [REG_DESIGN_CAPACITY] =
+ SBS_DATA(POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN, 0x18, 0, 65535),
+ [REG_DESIGN_CAPACITY_CHARGE] =
+ SBS_DATA(POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN, 0x18, 0, 65535),
+ [REG_DESIGN_VOLTAGE_MIN] =
+ SBS_DATA(POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN, 0x19, 0, 65535),
+ [REG_DESIGN_VOLTAGE_MAX] =
+ SBS_DATA(POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN, 0x19, 0, 65535),
+ [REG_SERIAL_NUMBER] =
+ SBS_DATA(POWER_SUPPLY_PROP_SERIAL_NUMBER, 0x1C, 0, 65535),
+ /* Properties of type `const char *' */
+ [REG_MANUFACTURER] =
+ SBS_DATA(POWER_SUPPLY_PROP_MANUFACTURER, 0x20, 0, 65535),
+ [REG_MODEL_NAME] =
+ SBS_DATA(POWER_SUPPLY_PROP_MODEL_NAME, 0x21, 0, 65535),
+ [REG_CHEMISTRY] =
+ SBS_DATA(POWER_SUPPLY_PROP_TECHNOLOGY, 0x22, 0, 65535)
+};
+
+static const enum power_supply_property sbs_properties[] = {
+ POWER_SUPPLY_PROP_STATUS,
+ POWER_SUPPLY_PROP_CAPACITY_LEVEL,
+ POWER_SUPPLY_PROP_HEALTH,
+ POWER_SUPPLY_PROP_PRESENT,
+ POWER_SUPPLY_PROP_TECHNOLOGY,
+ POWER_SUPPLY_PROP_CYCLE_COUNT,
+ POWER_SUPPLY_PROP_VOLTAGE_NOW,
+ POWER_SUPPLY_PROP_CURRENT_NOW,
+ POWER_SUPPLY_PROP_CURRENT_AVG,
+ POWER_SUPPLY_PROP_CAPACITY,
+ POWER_SUPPLY_PROP_CAPACITY_ERROR_MARGIN,
+ POWER_SUPPLY_PROP_TEMP,
+ POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
+ POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG,
+ POWER_SUPPLY_PROP_TIME_TO_FULL_AVG,
+ POWER_SUPPLY_PROP_SERIAL_NUMBER,
+ POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
+ POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
+ POWER_SUPPLY_PROP_ENERGY_NOW,
+ POWER_SUPPLY_PROP_ENERGY_FULL,
+ POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
+ POWER_SUPPLY_PROP_CHARGE_NOW,
+ POWER_SUPPLY_PROP_CHARGE_FULL,
+ POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
+ POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX,
+ POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX,
+ POWER_SUPPLY_PROP_MANUFACTURE_YEAR,
+ POWER_SUPPLY_PROP_MANUFACTURE_MONTH,
+ POWER_SUPPLY_PROP_MANUFACTURE_DAY,
+ /* Properties of type `const char *' */
+ POWER_SUPPLY_PROP_MANUFACTURER,
+ POWER_SUPPLY_PROP_MODEL_NAME
+};
+
+/* Supports special manufacturer commands from TI BQ20Z65 and BQ20Z75 IC. */
+#define SBS_FLAGS_TI_BQ20ZX5 BIT(0)
+
+static const enum power_supply_property string_properties[] = {
+ POWER_SUPPLY_PROP_TECHNOLOGY,
+ POWER_SUPPLY_PROP_MANUFACTURER,
+ POWER_SUPPLY_PROP_MODEL_NAME,
+};
+
+#define NR_STRING_BUFFERS ARRAY_SIZE(string_properties)
+
+struct sbs_info {
+ struct i2c_client *client;
+ struct power_supply *power_supply;
+ bool is_present;
+ struct gpio_desc *gpio_detect;
+ bool charger_broadcasts;
+ int last_state;
+ int poll_time;
+ u32 i2c_retry_count;
+ u32 poll_retry_count;
+ struct delayed_work work;
+ struct mutex mode_lock;
+ u32 flags;
+ int technology;
+ char strings[NR_STRING_BUFFERS][I2C_SMBUS_BLOCK_MAX + 1];
+};
+
+static char *sbs_get_string_buf(struct sbs_info *chip,
+ enum power_supply_property psp)
+{
+ int i = 0;
+
+ for (i = 0; i < NR_STRING_BUFFERS; i++)
+ if (string_properties[i] == psp)
+ return chip->strings[i];
+
+ return ERR_PTR(-EINVAL);
+}
+
+static void sbs_invalidate_cached_props(struct sbs_info *chip)
+{
+ int i = 0;
+
+ chip->technology = -1;
+
+ for (i = 0; i < NR_STRING_BUFFERS; i++)
+ chip->strings[i][0] = 0;
+}
+
+static bool force_load;
+
+static int sbs_read_word_data(struct i2c_client *client, u8 address);
+static int sbs_write_word_data(struct i2c_client *client, u8 address, u16 value);
+
+static void sbs_disable_charger_broadcasts(struct sbs_info *chip)
+{
+ int val = sbs_read_word_data(chip->client, BATTERY_MODE_OFFSET);
+ if (val < 0)
+ goto exit;
+
+ val |= BATTERY_MODE_CHARGER_MASK;
+
+ val = sbs_write_word_data(chip->client, BATTERY_MODE_OFFSET, val);
+
+exit:
+ if (val < 0)
+ dev_err(&chip->client->dev,
+ "Failed to disable charger broadcasting: %d\n", val);
+ else
+ dev_dbg(&chip->client->dev, "%s\n", __func__);
+}
+
+static int sbs_update_presence(struct sbs_info *chip, bool is_present)
+{
+ struct i2c_client *client = chip->client;
+ int retries = chip->i2c_retry_count;
+ s32 ret = 0;
+ u8 version;
+
+ if (chip->is_present == is_present)
+ return 0;
+
+ if (!is_present) {
+ chip->is_present = false;
+ /* Disable PEC when no device is present */
+ client->flags &= ~I2C_CLIENT_PEC;
+ sbs_invalidate_cached_props(chip);
+ return 0;
+ }
+
+ /* Check if device supports packet error checking and use it */
+ while (retries > 0) {
+ ret = i2c_smbus_read_word_data(client, REG_ADDR_SPEC_INFO);
+ if (ret >= 0)
+ break;
+
+ /*
+ * Some batteries trigger the detection pin before the
+ * I2C bus is properly connected. This works around the
+ * issue.
+ */
+ msleep(100);
+
+ retries--;
+ }
+
+ if (ret < 0) {
+ dev_dbg(&client->dev, "failed to read spec info: %d\n", ret);
+
+ /* fallback to old behaviour */
+ client->flags &= ~I2C_CLIENT_PEC;
+ chip->is_present = true;
+
+ return ret;
+ }
+
+ version = (ret & SPEC_INFO_VERSION_MASK) >> SPEC_INFO_VERSION_SHIFT;
+
+ if (version == SBS_VERSION_1_1_WITH_PEC)
+ client->flags |= I2C_CLIENT_PEC;
+ else
+ client->flags &= ~I2C_CLIENT_PEC;
+
+ if (of_device_is_compatible(client->dev.parent->of_node, "google,cros-ec-i2c-tunnel")
+ && client->flags & I2C_CLIENT_PEC) {
+ dev_info(&client->dev, "Disabling PEC because of broken Cros-EC implementation\n");
+ client->flags &= ~I2C_CLIENT_PEC;
+ }
+
+ dev_dbg(&client->dev, "PEC: %s\n", (client->flags & I2C_CLIENT_PEC) ?
+ "enabled" : "disabled");
+
+ if (!chip->is_present && is_present && !chip->charger_broadcasts)
+ sbs_disable_charger_broadcasts(chip);
+
+ chip->is_present = true;
+
+ return 0;
+}
+
+static int sbs_read_word_data(struct i2c_client *client, u8 address)
+{
+ struct sbs_info *chip = i2c_get_clientdata(client);
+ int retries = chip->i2c_retry_count;
+ s32 ret = 0;
+
+ while (retries > 0) {
+ ret = i2c_smbus_read_word_data(client, address);
+ if (ret >= 0)
+ break;
+ retries--;
+ }
+
+ if (ret < 0) {
+ dev_dbg(&client->dev,
+ "%s: i2c read at address 0x%x failed\n",
+ __func__, address);
+ return ret;
+ }
+
+ return ret;
+}
+
+static int sbs_read_string_data_fallback(struct i2c_client *client, u8 address, char *values)
+{
+ struct sbs_info *chip = i2c_get_clientdata(client);
+ s32 ret = 0, block_length = 0;
+ int retries_length, retries_block;
+ u8 block_buffer[I2C_SMBUS_BLOCK_MAX + 1];
+
+ retries_length = chip->i2c_retry_count;
+ retries_block = chip->i2c_retry_count;
+
+ dev_warn_once(&client->dev, "I2C adapter does not support I2C_FUNC_SMBUS_READ_BLOCK_DATA.\n"
+ "Fallback method does not support PEC.\n");
+
+ /* Adapter needs to support these two functions */
+ if (!i2c_check_functionality(client->adapter,
+ I2C_FUNC_SMBUS_BYTE_DATA |
+ I2C_FUNC_SMBUS_I2C_BLOCK)){
+ return -ENODEV;
+ }
+
+ /* Get the length of block data */
+ while (retries_length > 0) {
+ ret = i2c_smbus_read_byte_data(client, address);
+ if (ret >= 0)
+ break;
+ retries_length--;
+ }
+
+ if (ret < 0) {
+ dev_dbg(&client->dev,
+ "%s: i2c read at address 0x%x failed\n",
+ __func__, address);
+ return ret;
+ }
+
+ /* block_length does not include NULL terminator */
+ block_length = ret;
+ if (block_length > I2C_SMBUS_BLOCK_MAX) {
+ dev_err(&client->dev,
+ "%s: Returned block_length is longer than 0x%x\n",
+ __func__, I2C_SMBUS_BLOCK_MAX);
+ return -EINVAL;
+ }
+
+ /* Get the block data */
+ while (retries_block > 0) {
+ ret = i2c_smbus_read_i2c_block_data(
+ client, address,
+ block_length + 1, block_buffer);
+ if (ret >= 0)
+ break;
+ retries_block--;
+ }
+
+ if (ret < 0) {
+ dev_dbg(&client->dev,
+ "%s: i2c read at address 0x%x failed\n",
+ __func__, address);
+ return ret;
+ }
+
+ /* block_buffer[0] == block_length */
+ memcpy(values, block_buffer + 1, block_length);
+ values[block_length] = '\0';
+
+ return ret;
+}
+
+static int sbs_read_string_data(struct i2c_client *client, u8 address, char *values)
+{
+ struct sbs_info *chip = i2c_get_clientdata(client);
+ int retries = chip->i2c_retry_count;
+ int ret = 0;
+
+ if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_READ_BLOCK_DATA)) {
+ bool pec = client->flags & I2C_CLIENT_PEC;
+ client->flags &= ~I2C_CLIENT_PEC;
+ ret = sbs_read_string_data_fallback(client, address, values);
+ if (pec)
+ client->flags |= I2C_CLIENT_PEC;
+ return ret;
+ }
+
+ while (retries > 0) {
+ ret = i2c_smbus_read_block_data(client, address, values);
+ if (ret >= 0)
+ break;
+ retries--;
+ }
+
+ if (ret < 0) {
+ dev_dbg(&client->dev, "failed to read block 0x%x: %d\n", address, ret);
+ return ret;
+ }
+
+ /* add string termination */
+ values[ret] = '\0';
+ return ret;
+}
+
+static int sbs_write_word_data(struct i2c_client *client, u8 address,
+ u16 value)
+{
+ struct sbs_info *chip = i2c_get_clientdata(client);
+ int retries = chip->i2c_retry_count;
+ s32 ret = 0;
+
+ while (retries > 0) {
+ ret = i2c_smbus_write_word_data(client, address, value);
+ if (ret >= 0)
+ break;
+ retries--;
+ }
+
+ if (ret < 0) {
+ dev_dbg(&client->dev,
+ "%s: i2c write to address 0x%x failed\n",
+ __func__, address);
+ return ret;
+ }
+
+ return 0;
+}
+
+static int sbs_status_correct(struct i2c_client *client, int *intval)
+{
+ int ret;
+
+ ret = sbs_read_word_data(client, sbs_data[REG_CURRENT_NOW].addr);
+ if (ret < 0)
+ return ret;
+
+ ret = (s16)ret;
+
+ /* Not drawing current -> not charging (i.e. idle) */
+ if (*intval != POWER_SUPPLY_STATUS_FULL && ret == 0)
+ *intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
+
+ if (*intval == POWER_SUPPLY_STATUS_FULL) {
+ /* Drawing or providing current when full */
+ if (ret > 0)
+ *intval = POWER_SUPPLY_STATUS_CHARGING;
+ else if (ret < 0)
+ *intval = POWER_SUPPLY_STATUS_DISCHARGING;
+ }
+
+ return 0;
+}
+
+static bool sbs_bat_needs_calibration(struct i2c_client *client)
+{
+ int ret;
+
+ ret = sbs_read_word_data(client, sbs_data[REG_BATTERY_MODE].addr);
+ if (ret < 0)
+ return false;
+
+ return !!(ret & BIT(7));
+}
+
+static int sbs_get_ti_battery_presence_and_health(
+ struct i2c_client *client, enum power_supply_property psp,
+ union power_supply_propval *val)
+{
+ s32 ret;
+
+ /*
+ * Write to ManufacturerAccess with ManufacturerAccess command
+ * and then read the status.
+ */
+ ret = sbs_write_word_data(client, sbs_data[REG_MANUFACTURER_DATA].addr,
+ MANUFACTURER_ACCESS_STATUS);
+ if (ret < 0) {
+ if (psp == POWER_SUPPLY_PROP_PRESENT)
+ val->intval = 0; /* battery removed */
+ return ret;
+ }
+
+ ret = sbs_read_word_data(client, sbs_data[REG_MANUFACTURER_DATA].addr);
+ if (ret < 0) {
+ if (psp == POWER_SUPPLY_PROP_PRESENT)
+ val->intval = 0; /* battery removed */
+ return ret;
+ }
+
+ if (ret < sbs_data[REG_MANUFACTURER_DATA].min_value ||
+ ret > sbs_data[REG_MANUFACTURER_DATA].max_value) {
+ val->intval = 0;
+ return 0;
+ }
+
+ /* Mask the upper nibble of 2nd byte and
+ * lower byte of response then
+ * shift the result by 8 to get status*/
+ ret &= 0x0F00;
+ ret >>= 8;
+ if (psp == POWER_SUPPLY_PROP_PRESENT) {
+ if (ret == 0x0F)
+ /* battery removed */
+ val->intval = 0;
+ else
+ val->intval = 1;
+ } else if (psp == POWER_SUPPLY_PROP_HEALTH) {
+ if (ret == 0x09)
+ val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
+ else if (ret == 0x0B)
+ val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
+ else if (ret == 0x0C)
+ val->intval = POWER_SUPPLY_HEALTH_DEAD;
+ else if (sbs_bat_needs_calibration(client))
+ val->intval = POWER_SUPPLY_HEALTH_CALIBRATION_REQUIRED;
+ else
+ val->intval = POWER_SUPPLY_HEALTH_GOOD;
+ }
+
+ return 0;
+}
+
+static int sbs_get_battery_presence_and_health(
+ struct i2c_client *client, enum power_supply_property psp,
+ union power_supply_propval *val)
+{
+ struct sbs_info *chip = i2c_get_clientdata(client);
+ int ret;
+
+ if (chip->flags & SBS_FLAGS_TI_BQ20ZX5)
+ return sbs_get_ti_battery_presence_and_health(client, psp, val);
+
+ /* Dummy command; if it succeeds, battery is present. */
+ ret = sbs_read_word_data(client, sbs_data[REG_STATUS].addr);
+
+ if (ret < 0) { /* battery not present*/
+ if (psp == POWER_SUPPLY_PROP_PRESENT) {
+ val->intval = 0;
+ return 0;
+ }
+ return ret;
+ }
+
+ if (psp == POWER_SUPPLY_PROP_PRESENT)
+ val->intval = 1; /* battery present */
+ else { /* POWER_SUPPLY_PROP_HEALTH */
+ if (sbs_bat_needs_calibration(client)) {
+ val->intval = POWER_SUPPLY_HEALTH_CALIBRATION_REQUIRED;
+ } else {
+ /* SBS spec doesn't have a general health command. */
+ val->intval = POWER_SUPPLY_HEALTH_UNKNOWN;
+ }
+ }
+
+ return 0;
+}
+
+static int sbs_get_battery_property(struct i2c_client *client,
+ int reg_offset, enum power_supply_property psp,
+ union power_supply_propval *val)
+{
+ struct sbs_info *chip = i2c_get_clientdata(client);
+ s32 ret;
+
+ ret = sbs_read_word_data(client, sbs_data[reg_offset].addr);
+ if (ret < 0)
+ return ret;
+
+ /* returned values are 16 bit */
+ if (sbs_data[reg_offset].min_value < 0)
+ ret = (s16)ret;
+
+ if (ret >= sbs_data[reg_offset].min_value &&
+ ret <= sbs_data[reg_offset].max_value) {
+ val->intval = ret;
+ if (psp == POWER_SUPPLY_PROP_CAPACITY_LEVEL) {
+ if (!(ret & BATTERY_INITIALIZED))
+ val->intval =
+ POWER_SUPPLY_CAPACITY_LEVEL_UNKNOWN;
+ else if (ret & BATTERY_FULL_CHARGED)
+ val->intval =
+ POWER_SUPPLY_CAPACITY_LEVEL_FULL;
+ else if (ret & BATTERY_FULL_DISCHARGED)
+ val->intval =
+ POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
+ else
+ val->intval =
+ POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
+ return 0;
+ } else if (psp != POWER_SUPPLY_PROP_STATUS) {
+ return 0;
+ }
+
+ if (ret & BATTERY_FULL_CHARGED)
+ val->intval = POWER_SUPPLY_STATUS_FULL;
+ else if (ret & BATTERY_DISCHARGING)
+ val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
+ else
+ val->intval = POWER_SUPPLY_STATUS_CHARGING;
+
+ sbs_status_correct(client, &val->intval);
+
+ if (chip->poll_time == 0)
+ chip->last_state = val->intval;
+ else if (chip->last_state != val->intval) {
+ cancel_delayed_work_sync(&chip->work);
+ power_supply_changed(chip->power_supply);
+ chip->poll_time = 0;
+ }
+ } else {
+ if (psp == POWER_SUPPLY_PROP_STATUS)
+ val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
+ else if (psp == POWER_SUPPLY_PROP_CAPACITY)
+ /* sbs spec says that this can be >100 %
+ * even if max value is 100 %
+ */
+ val->intval = min(ret, 100);
+ else
+ val->intval = 0;
+ }
+
+ return 0;
+}
+
+static int sbs_get_property_index(struct i2c_client *client,
+ enum power_supply_property psp)
+{
+ int count;
+
+ for (count = 0; count < ARRAY_SIZE(sbs_data); count++)
+ if (psp == sbs_data[count].psp)
+ return count;
+
+ dev_warn(&client->dev,
+ "%s: Invalid Property - %d\n", __func__, psp);
+
+ return -EINVAL;
+}
+
+static const char *sbs_get_constant_string(struct sbs_info *chip,
+ enum power_supply_property psp)
+{
+ int ret;
+ char *buf;
+ u8 addr;
+
+ buf = sbs_get_string_buf(chip, psp);
+ if (IS_ERR(buf))
+ return buf;
+
+ if (!buf[0]) {
+ ret = sbs_get_property_index(chip->client, psp);
+ if (ret < 0)
+ return ERR_PTR(ret);
+
+ addr = sbs_data[ret].addr;
+
+ ret = sbs_read_string_data(chip->client, addr, buf);
+ if (ret < 0)
+ return ERR_PTR(ret);
+ }
+
+ return buf;
+}
+
+static void sbs_unit_adjustment(struct i2c_client *client,
+ enum power_supply_property psp, union power_supply_propval *val)
+{
+#define BASE_UNIT_CONVERSION 1000
+#define BATTERY_MODE_CAP_MULT_WATT (10 * BASE_UNIT_CONVERSION)
+#define TIME_UNIT_CONVERSION 60
+#define TEMP_KELVIN_TO_CELSIUS 2731
+ switch (psp) {
+ case POWER_SUPPLY_PROP_ENERGY_NOW:
+ case POWER_SUPPLY_PROP_ENERGY_FULL:
+ case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
+ /* sbs provides energy in units of 10mWh.
+ * Convert to µWh
+ */
+ val->intval *= BATTERY_MODE_CAP_MULT_WATT;
+ break;
+
+ case POWER_SUPPLY_PROP_VOLTAGE_NOW:
+ case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
+ case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
+ case POWER_SUPPLY_PROP_CURRENT_NOW:
+ case POWER_SUPPLY_PROP_CURRENT_AVG:
+ case POWER_SUPPLY_PROP_CHARGE_NOW:
+ case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX:
+ case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX:
+ case POWER_SUPPLY_PROP_CHARGE_FULL:
+ case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
+ val->intval *= BASE_UNIT_CONVERSION;
+ break;
+
+ case POWER_SUPPLY_PROP_TEMP:
+ /* sbs provides battery temperature in 0.1K
+ * so convert it to 0.1°C
+ */
+ val->intval -= TEMP_KELVIN_TO_CELSIUS;
+ break;
+
+ case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW:
+ case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG:
+ case POWER_SUPPLY_PROP_TIME_TO_FULL_AVG:
+ /* sbs provides time to empty and time to full in minutes.
+ * Convert to seconds
+ */
+ val->intval *= TIME_UNIT_CONVERSION;
+ break;
+
+ default:
+ dev_dbg(&client->dev,
+ "%s: no need for unit conversion %d\n", __func__, psp);
+ }
+}
+
+static enum sbs_capacity_mode sbs_set_capacity_mode(struct i2c_client *client,
+ enum sbs_capacity_mode mode)
+{
+ int ret, original_val;
+
+ original_val = sbs_read_word_data(client, BATTERY_MODE_OFFSET);
+ if (original_val < 0)
+ return original_val;
+
+ if ((original_val & BATTERY_MODE_CAPACITY_MASK) == mode)
+ return mode;
+
+ if (mode == CAPACITY_MODE_AMPS)
+ ret = original_val & ~BATTERY_MODE_CAPACITY_MASK;
+ else
+ ret = original_val | BATTERY_MODE_CAPACITY_MASK;
+
+ ret = sbs_write_word_data(client, BATTERY_MODE_OFFSET, ret);
+ if (ret < 0)
+ return ret;
+
+ usleep_range(1000, 2000);
+
+ return original_val & BATTERY_MODE_CAPACITY_MASK;
+}
+
+static int sbs_get_battery_capacity(struct i2c_client *client,
+ int reg_offset, enum power_supply_property psp,
+ union power_supply_propval *val)
+{
+ s32 ret;
+ enum sbs_capacity_mode mode = CAPACITY_MODE_WATTS;
+
+ if (power_supply_is_amp_property(psp))
+ mode = CAPACITY_MODE_AMPS;
+
+ mode = sbs_set_capacity_mode(client, mode);
+ if ((int)mode < 0)
+ return mode;
+
+ ret = sbs_read_word_data(client, sbs_data[reg_offset].addr);
+ if (ret < 0)
+ return ret;
+
+ val->intval = ret;
+
+ ret = sbs_set_capacity_mode(client, mode);
+ if (ret < 0)
+ return ret;
+
+ return 0;
+}
+
+static char sbs_serial[5];
+static int sbs_get_battery_serial_number(struct i2c_client *client,
+ union power_supply_propval *val)
+{
+ int ret;
+
+ ret = sbs_read_word_data(client, sbs_data[REG_SERIAL_NUMBER].addr);
+ if (ret < 0)
+ return ret;
+
+ sprintf(sbs_serial, "%04x", ret);
+ val->strval = sbs_serial;
+
+ return 0;
+}
+
+static int sbs_get_chemistry(struct sbs_info *chip,
+ union power_supply_propval *val)
+{
+ const char *chemistry;
+
+ if (chip->technology != -1) {
+ val->intval = chip->technology;
+ return 0;
+ }
+
+ chemistry = sbs_get_constant_string(chip, POWER_SUPPLY_PROP_TECHNOLOGY);
+
+ if (IS_ERR(chemistry))
+ return PTR_ERR(chemistry);
+
+ if (!strncasecmp(chemistry, "LION", 4))
+ chip->technology = POWER_SUPPLY_TECHNOLOGY_LION;
+ else if (!strncasecmp(chemistry, "LiP", 3))
+ chip->technology = POWER_SUPPLY_TECHNOLOGY_LIPO;
+ else if (!strncasecmp(chemistry, "NiCd", 4))
+ chip->technology = POWER_SUPPLY_TECHNOLOGY_NiCd;
+ else if (!strncasecmp(chemistry, "NiMH", 4))
+ chip->technology = POWER_SUPPLY_TECHNOLOGY_NiMH;
+ else
+ chip->technology = POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
+
+ if (chip->technology == POWER_SUPPLY_TECHNOLOGY_UNKNOWN)
+ dev_warn(&chip->client->dev, "Unknown chemistry: %s\n", chemistry);
+
+ val->intval = chip->technology;
+
+ return 0;
+}
+
+static int sbs_get_battery_manufacture_date(struct i2c_client *client,
+ enum power_supply_property psp,
+ union power_supply_propval *val)
+{
+ int ret;
+ u16 day, month, year;
+
+ ret = sbs_read_word_data(client, REG_ADDR_MANUFACTURE_DATE);
+ if (ret < 0)
+ return ret;
+
+ day = ret & GENMASK(4, 0);
+ month = (ret & GENMASK(8, 5)) >> 5;
+ year = ((ret & GENMASK(15, 9)) >> 9) + 1980;
+
+ switch (psp) {
+ case POWER_SUPPLY_PROP_MANUFACTURE_YEAR:
+ val->intval = year;
+ break;
+ case POWER_SUPPLY_PROP_MANUFACTURE_MONTH:
+ val->intval = month;
+ break;
+ case POWER_SUPPLY_PROP_MANUFACTURE_DAY:
+ val->intval = day;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int sbs_get_property(struct power_supply *psy,
+ enum power_supply_property psp,
+ union power_supply_propval *val)
+{
+ int ret = 0;
+ struct sbs_info *chip = power_supply_get_drvdata(psy);
+ struct i2c_client *client = chip->client;
+ const char *str;
+
+ if (chip->gpio_detect) {
+ ret = gpiod_get_value_cansleep(chip->gpio_detect);
+ if (ret < 0)
+ return ret;
+ if (psp == POWER_SUPPLY_PROP_PRESENT) {
+ val->intval = ret;
+ sbs_update_presence(chip, ret);
+ return 0;
+ }
+ if (ret == 0)
+ return -ENODATA;
+ }
+
+ switch (psp) {
+ case POWER_SUPPLY_PROP_PRESENT:
+ case POWER_SUPPLY_PROP_HEALTH:
+ ret = sbs_get_battery_presence_and_health(client, psp, val);
+
+ /* this can only be true if no gpio is used */
+ if (psp == POWER_SUPPLY_PROP_PRESENT)
+ return 0;
+ break;
+
+ case POWER_SUPPLY_PROP_TECHNOLOGY:
+ ret = sbs_get_chemistry(chip, val);
+ if (ret < 0)
+ break;
+
+ goto done; /* don't trigger power_supply_changed()! */
+
+ case POWER_SUPPLY_PROP_ENERGY_NOW:
+ case POWER_SUPPLY_PROP_ENERGY_FULL:
+ case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
+ case POWER_SUPPLY_PROP_CHARGE_NOW:
+ case POWER_SUPPLY_PROP_CHARGE_FULL:
+ case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
+ ret = sbs_get_property_index(client, psp);
+ if (ret < 0)
+ break;
+
+ /* sbs_get_battery_capacity() will change the battery mode
+ * temporarily to read the requested attribute. Ensure we stay
+ * in the desired mode for the duration of the attribute read.
+ */
+ mutex_lock(&chip->mode_lock);
+ ret = sbs_get_battery_capacity(client, ret, psp, val);
+ mutex_unlock(&chip->mode_lock);
+ break;
+
+ case POWER_SUPPLY_PROP_SERIAL_NUMBER:
+ ret = sbs_get_battery_serial_number(client, val);
+ break;
+
+ case POWER_SUPPLY_PROP_STATUS:
+ case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
+ case POWER_SUPPLY_PROP_CYCLE_COUNT:
+ case POWER_SUPPLY_PROP_VOLTAGE_NOW:
+ case POWER_SUPPLY_PROP_CURRENT_NOW:
+ case POWER_SUPPLY_PROP_CURRENT_AVG:
+ case POWER_SUPPLY_PROP_TEMP:
+ case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW:
+ case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG:
+ case POWER_SUPPLY_PROP_TIME_TO_FULL_AVG:
+ case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
+ case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
+ case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX:
+ case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX:
+ case POWER_SUPPLY_PROP_CAPACITY:
+ case POWER_SUPPLY_PROP_CAPACITY_ERROR_MARGIN:
+ ret = sbs_get_property_index(client, psp);
+ if (ret < 0)
+ break;
+
+ ret = sbs_get_battery_property(client, ret, psp, val);
+ break;
+
+ case POWER_SUPPLY_PROP_MODEL_NAME:
+ case POWER_SUPPLY_PROP_MANUFACTURER:
+ str = sbs_get_constant_string(chip, psp);
+ if (IS_ERR(str))
+ ret = PTR_ERR(str);
+ else
+ val->strval = str;
+ break;
+
+ case POWER_SUPPLY_PROP_MANUFACTURE_YEAR:
+ case POWER_SUPPLY_PROP_MANUFACTURE_MONTH:
+ case POWER_SUPPLY_PROP_MANUFACTURE_DAY:
+ ret = sbs_get_battery_manufacture_date(client, psp, val);
+ break;
+
+ default:
+ dev_err(&client->dev,
+ "%s: INVALID property\n", __func__);
+ return -EINVAL;
+ }
+
+ if (!chip->gpio_detect && chip->is_present != (ret >= 0)) {
+ bool old_present = chip->is_present;
+ union power_supply_propval val;
+ int err = sbs_get_battery_presence_and_health(
+ client, POWER_SUPPLY_PROP_PRESENT, &val);
+
+ sbs_update_presence(chip, !err && val.intval);
+
+ if (old_present != chip->is_present)
+ power_supply_changed(chip->power_supply);
+ }
+
+done:
+ if (!ret) {
+ /* Convert units to match requirements for power supply class */
+ sbs_unit_adjustment(client, psp, val);
+ dev_dbg(&client->dev,
+ "%s: property = %d, value = %x\n", __func__,
+ psp, val->intval);
+ } else if (!chip->is_present) {
+ /* battery not present, so return NODATA for properties */
+ ret = -ENODATA;
+ }
+ return ret;
+}
+
+static void sbs_supply_changed(struct sbs_info *chip)
+{
+ struct power_supply *battery = chip->power_supply;
+ int ret;
+
+ ret = gpiod_get_value_cansleep(chip->gpio_detect);
+ if (ret < 0)
+ return;
+ sbs_update_presence(chip, ret);
+ power_supply_changed(battery);
+}
+
+static irqreturn_t sbs_irq(int irq, void *devid)
+{
+ sbs_supply_changed(devid);
+ return IRQ_HANDLED;
+}
+
+static void sbs_alert(struct i2c_client *client, enum i2c_alert_protocol prot,
+ unsigned int data)
+{
+ sbs_supply_changed(i2c_get_clientdata(client));
+}
+
+static void sbs_external_power_changed(struct power_supply *psy)
+{
+ struct sbs_info *chip = power_supply_get_drvdata(psy);
+
+ /* cancel outstanding work */
+ cancel_delayed_work_sync(&chip->work);
+
+ schedule_delayed_work(&chip->work, HZ);
+ chip->poll_time = chip->poll_retry_count;
+}
+
+static void sbs_delayed_work(struct work_struct *work)
+{
+ struct sbs_info *chip;
+ s32 ret;
+
+ chip = container_of(work, struct sbs_info, work.work);
+
+ ret = sbs_read_word_data(chip->client, sbs_data[REG_STATUS].addr);
+ /* if the read failed, give up on this work */
+ if (ret < 0) {
+ chip->poll_time = 0;
+ return;
+ }
+
+ if (ret & BATTERY_FULL_CHARGED)
+ ret = POWER_SUPPLY_STATUS_FULL;
+ else if (ret & BATTERY_DISCHARGING)
+ ret = POWER_SUPPLY_STATUS_DISCHARGING;
+ else
+ ret = POWER_SUPPLY_STATUS_CHARGING;
+
+ sbs_status_correct(chip->client, &ret);
+
+ if (chip->last_state != ret) {
+ chip->poll_time = 0;
+ power_supply_changed(chip->power_supply);
+ return;
+ }
+ if (chip->poll_time > 0) {
+ schedule_delayed_work(&chip->work, HZ);
+ chip->poll_time--;
+ return;
+ }
+}
+
+static const struct power_supply_desc sbs_default_desc = {
+ .type = POWER_SUPPLY_TYPE_BATTERY,
+ .properties = sbs_properties,
+ .num_properties = ARRAY_SIZE(sbs_properties),
+ .get_property = sbs_get_property,
+ .external_power_changed = sbs_external_power_changed,
+};
+
+static int sbs_probe(struct i2c_client *client)
+{
+ struct sbs_info *chip;
+ struct power_supply_desc *sbs_desc;
+ struct sbs_platform_data *pdata = client->dev.platform_data;
+ struct power_supply_config psy_cfg = {};
+ int rc;
+ int irq;
+
+ sbs_desc = devm_kmemdup(&client->dev, &sbs_default_desc,
+ sizeof(*sbs_desc), GFP_KERNEL);
+ if (!sbs_desc)
+ return -ENOMEM;
+
+ sbs_desc->name = devm_kasprintf(&client->dev, GFP_KERNEL, "sbs-%s",
+ dev_name(&client->dev));
+ if (!sbs_desc->name)
+ return -ENOMEM;
+
+ chip = devm_kzalloc(&client->dev, sizeof(struct sbs_info), GFP_KERNEL);
+ if (!chip)
+ return -ENOMEM;
+
+ chip->flags = (u32)(uintptr_t)device_get_match_data(&client->dev);
+ chip->client = client;
+ psy_cfg.of_node = client->dev.of_node;
+ psy_cfg.drv_data = chip;
+ chip->last_state = POWER_SUPPLY_STATUS_UNKNOWN;
+ sbs_invalidate_cached_props(chip);
+ mutex_init(&chip->mode_lock);
+
+ /* use pdata if available, fall back to DT properties,
+ * or hardcoded defaults if not
+ */
+ rc = device_property_read_u32(&client->dev, "sbs,i2c-retry-count",
+ &chip->i2c_retry_count);
+ if (rc)
+ chip->i2c_retry_count = 0;
+
+ rc = device_property_read_u32(&client->dev, "sbs,poll-retry-count",
+ &chip->poll_retry_count);
+ if (rc)
+ chip->poll_retry_count = 0;
+
+ if (pdata) {
+ chip->poll_retry_count = pdata->poll_retry_count;
+ chip->i2c_retry_count = pdata->i2c_retry_count;
+ }
+ chip->i2c_retry_count = chip->i2c_retry_count + 1;
+
+ chip->charger_broadcasts = !device_property_read_bool(&client->dev,
+ "sbs,disable-charger-broadcasts");
+
+ chip->gpio_detect = devm_gpiod_get_optional(&client->dev,
+ "sbs,battery-detect", GPIOD_IN);
+ if (IS_ERR(chip->gpio_detect))
+ return dev_err_probe(&client->dev, PTR_ERR(chip->gpio_detect),
+ "Failed to get gpio\n");
+
+ i2c_set_clientdata(client, chip);
+
+ if (!chip->gpio_detect)
+ goto skip_gpio;
+
+ irq = gpiod_to_irq(chip->gpio_detect);
+ if (irq <= 0) {
+ dev_warn(&client->dev, "Failed to get gpio as irq: %d\n", irq);
+ goto skip_gpio;
+ }
+
+ rc = devm_request_threaded_irq(&client->dev, irq, NULL, sbs_irq,
+ IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
+ dev_name(&client->dev), chip);
+ if (rc) {
+ dev_warn(&client->dev, "Failed to request irq: %d\n", rc);
+ goto skip_gpio;
+ }
+
+skip_gpio:
+ /*
+ * Before we register, we might need to make sure we can actually talk
+ * to the battery.
+ */
+ if (!(force_load || chip->gpio_detect)) {
+ union power_supply_propval val;
+
+ rc = sbs_get_battery_presence_and_health(
+ client, POWER_SUPPLY_PROP_PRESENT, &val);
+ if (rc < 0 || !val.intval)
+ return dev_err_probe(&client->dev, -ENODEV,
+ "Failed to get present status\n");
+ }
+
+ rc = devm_delayed_work_autocancel(&client->dev, &chip->work,
+ sbs_delayed_work);
+ if (rc)
+ return rc;
+
+ chip->power_supply = devm_power_supply_register(&client->dev, sbs_desc,
+ &psy_cfg);
+ if (IS_ERR(chip->power_supply))
+ return dev_err_probe(&client->dev, PTR_ERR(chip->power_supply),
+ "Failed to register power supply\n");
+
+ dev_info(&client->dev,
+ "%s: battery gas gauge device registered\n", client->name);
+
+ return 0;
+}
+
+#if defined CONFIG_PM_SLEEP
+
+static int sbs_suspend(struct device *dev)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct sbs_info *chip = i2c_get_clientdata(client);
+ int ret;
+
+ if (chip->poll_time > 0)
+ cancel_delayed_work_sync(&chip->work);
+
+ if (chip->flags & SBS_FLAGS_TI_BQ20ZX5) {
+ /* Write to manufacturer access with sleep command. */
+ ret = sbs_write_word_data(client,
+ sbs_data[REG_MANUFACTURER_DATA].addr,
+ MANUFACTURER_ACCESS_SLEEP);
+ if (chip->is_present && ret < 0)
+ return ret;
+ }
+
+ return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(sbs_pm_ops, sbs_suspend, NULL);
+#define SBS_PM_OPS (&sbs_pm_ops)
+
+#else
+#define SBS_PM_OPS NULL
+#endif
+
+static const struct i2c_device_id sbs_id[] = {
+ { "bq20z65", 0 },
+ { "bq20z75", 0 },
+ { "sbs-battery", 1 },
+ {}
+};
+MODULE_DEVICE_TABLE(i2c, sbs_id);
+
+static const struct of_device_id sbs_dt_ids[] = {
+ { .compatible = "sbs,sbs-battery" },
+ {
+ .compatible = "ti,bq20z65",
+ .data = (void *)SBS_FLAGS_TI_BQ20ZX5,
+ },
+ {
+ .compatible = "ti,bq20z75",
+ .data = (void *)SBS_FLAGS_TI_BQ20ZX5,
+ },
+ { }
+};
+MODULE_DEVICE_TABLE(of, sbs_dt_ids);
+
+static struct i2c_driver sbs_battery_driver = {
+ .probe_new = sbs_probe,
+ .alert = sbs_alert,
+ .id_table = sbs_id,
+ .driver = {
+ .name = "sbs-battery",
+ .of_match_table = sbs_dt_ids,
+ .pm = SBS_PM_OPS,
+ },
+};
+module_i2c_driver(sbs_battery_driver);
+
+MODULE_DESCRIPTION("SBS battery monitor driver");
+MODULE_LICENSE("GPL");
+
+module_param(force_load, bool, 0444);
+MODULE_PARM_DESC(force_load,
+ "Attempt to load the driver even if no battery is connected");