Merge "power: qcom: Add QTI QBG(Qualcomm Battery Gauging) driver" (e3e00bfb) · Commits · e / devices / android_kernel_fairphone_FP5

drivers/power/supply/qcom/Kconfig

+12 −0

Original line number	Diff line number	Diff line
		@@ -101,4 +101,16 @@ config SMB358_CHARGER
		The driver supports charger enable/disable.
		The driver reports the charger status via the power supply framework.
		A charger status change triggers an IRQ via the device STAT pin.

		config QTI_QBG
		tristate "QTI Battery Gauge"
		depends on MFD_SPMI_PMIC && IIO
		help
		Say Y here to enable the Qualcomm Technologies, Inc. Battery Gauge
		driver which uses the periodic samples of the battery voltage and
		current to determine the battery state-of-charge (SOC) and supports
		other battery management features.

		To compile this driver as a module, choose M here: the
		module will be called qti-qbg-main.
		endif

drivers/power/supply/qcom/Makefile

+2 −0

Original line number	Diff line number	Diff line
		@@ -13,3 +13,5 @@ qcom-smb1355-charger-y += smb1355-charger.o pmic-voter.o
		obj-$(CONFIG_SMB1351_USB_CHARGER) += smb1351-charger.o pmic-voter.o
		obj-$(CONFIG_SMB1390_CHARGE_PUMP_PSY) += qcom-smb1390-charger.o
		qcom-smb1390-charger-y += smb1390-charger-psy.o pmic-voter.o
		obj-$(CONFIG_QTI_QBG) += qti-qbg-main.o
		qti-qbg-main-y += qti-qbg.o qbg-sdam.o qbg-battery-profile.o battery-profile-loader.o

drivers/power/supply/qcom/qbg-battery-profile.c

0 → 100644

+589 −0

Original line number	Diff line number	Diff line
		// SPDX-License-Identifier: GPL-2.0-only
		/*
		* Copyright (c) 2021 The Linux Foundation. All rights reserved.
		*/

		#define pr_fmt(fmt) "QBG-K: %s: " fmt, __func__

		#include <linux/cdev.h>
		#include <linux/device.h>
		#include <linux/fcntl.h>
		#include <linux/fs.h>
		#include <linux/kernel.h>
		#include <linux/module.h>
		#include <linux/of.h>
		#include <linux/slab.h>
		#include <linux/uaccess.h>

		#include <uapi/linux/qbg-profile.h>

		#include "qbg-battery-profile.h"

		static int table_temperatures[] = { -20, -10, 0, 10, 25, 40, 50 };

		static int qbg_battery_data_open(struct inode inode, struct file file)
		{
		struct qbg_battery_data *battery = container_of(inode->i_cdev,
		struct qbg_battery_data, battery_cdev);

		pr_debug("battery_data device opened\n");
		file->private_data = battery;

		return 0;
		}

		static long qbg_battery_data_ioctl(struct file *file, unsigned int cmd,
		unsigned long arg)
		{
		struct qbg_battery_data *battery = file->private_data;
		struct battery_config __user *profile_user;
		struct battery_profile_table bp_table;
		struct battery_profile_table __user *bp_table_user;
		struct battery_data_table *table;
		int rc = 0, table_index, table_type;

		if (!battery->profile_node) {
		pr_err("Invalid battery profile node\n");
		return -EINVAL;
		}

		if (!arg) {
		pr_err("Invalid user pointer\n");
		return -EINVAL;
		}

		switch (cmd) {
		case BPIOCXBP:
		profile_user = (struct battery_config __user *)arg;

		if (copy_to_user(profile_user, &battery->bp, sizeof(battery->bp))) {
		pr_err("Failed to copy battery profile to user\n");
		return -EFAULT;
		}

		break;
		case BPIOCXBPTABLE:
		bp_table_user = (struct battery_profile_table __user *)arg;

		if (copy_from_user(&bp_table, bp_table_user, sizeof(bp_table))) {
		pr_err("Failed to copy battery_profile_table from user\n");
		return -EFAULT;
		}

		table_index = bp_table.table_index;
		table_type = bp_table.table_type;

		if ((table_type != CHARGE_TABLE) &&
		(table_type != DISCHARGE_TABLE))
		return -EFAULT;

		if (((table_type == CHARGE_TABLE) &&
		(table_index >= battery->num_ctables)) \|\|
		((table_type == DISCHARGE_TABLE) &&
		(table_index >= battery->num_dtables)))
		return -EFAULT;

		table = (table_type == CHARGE_TABLE) ?
		battery->bp_charge_tables[table_index] :
		battery->bp_discharge_tables[table_index];

		if (copy_to_user(bp_table.table, table, sizeof(*table))) {
		pr_err("Failed to copy battery profile table to user\n");
		return -EFAULT;
		}

		pr_debug("Copied %s table %d to user\n",
		table_type == CHARGE_TABLE ? "Charge" : "Discharge", table_index);
		break;
		default:
		pr_err_ratelimited("IOCTL %u not supported\n", cmd);
		rc = -EINVAL;
		break;
		}

		return rc;
		}

		static int qbg_battery_data_release(struct inode inode, struct file file)
		{
		pr_debug("battery_data device closed\n");

		return 0;
		}

		static const struct file_operations qbg_battery_data_fops = {
		.owner = THIS_MODULE,
		.open = qbg_battery_data_open,
		.unlocked_ioctl = qbg_battery_data_ioctl,
		.compat_ioctl = qbg_battery_data_ioctl,
		.release = qbg_battery_data_release,
		};

		#define QBG_PON_TEMPERATURE 25
		static int qbg_parse_table0(struct device_node *profile_node,
		char table_name, struct battery_data_table0 table)
		{
		struct device_node *node;
		int rc = 0, temperature;

		node = of_find_node_by_name(profile_node, table_name);
		if (!node) {
		pr_err("%s not found\n", table_name);
		return -ENODEV;
		}

		rc = of_property_read_s32(node, "qcom,temperature", &temperature);
		if (rc < 0) {
		pr_err("Failed to read %s temperature\n", table_name);
		goto out;
		}

		if (temperature != QBG_PON_TEMPERATURE) {
		pr_err("Invalid table0 found, temperature:%d\n",
		temperature);
		rc = -EINVAL;
		goto out;
		}

		rc = of_property_count_elems_of_size(node, "qcom,soc", sizeof(int));
		if (rc < 0) {
		pr_err("Failed to get soc-length for %s, rc=%d\n",
		table_name, rc);
		goto out;
		}
		table->soc_length = rc;

		table->soc = kcalloc(table->soc_length, sizeof(*table->soc), GFP_KERNEL);
		if (!table->soc) {
		rc = -ENOMEM;
		goto out;
		}

		rc = of_property_read_u32_array(node, "qcom,soc", table->soc,
		table->soc_length);
		if (rc < 0) {
		pr_err("Failed to read qcom,soc\n");
		rc = -EINVAL;
		goto cleanup_soc;
		}

		rc = of_property_count_elems_of_size(node, "qcom,ocv", sizeof(int));
		if (rc < 0) {
		pr_err("Failed to get ocv-length for %s, rc=%d\n",
		table_name, rc);
		goto cleanup_soc;
		}
		table->ocv_length = rc;

		table->ocv = kcalloc(table->ocv_length, sizeof(*table->ocv), GFP_KERNEL);
		if (!table->ocv) {
		rc = -ENOMEM;
		goto cleanup_soc;
		}

		rc = of_property_read_u32_array(node, "qcom,ocv", table->ocv,
		table->ocv_length);
		if (rc < 0) {
		pr_err("Failed to read qcom,ocv\n");
		rc = -EINVAL;
		goto cleanup_ocv;
		}

		return 0;

		cleanup_ocv:
		kfree(table->ocv);
		cleanup_soc:
		kfree(table->soc);
		out:
		of_node_put(node);

		return rc;
		}

		static int qbg_parse_table(struct device_node *profile_node,
		int index, char table_name, struct battery_data_table bp_table)
		{
		struct device_node *node;
		struct property *prop;
		const __be32 *data;
		int rc = 0, j, k, temperature;
		u32 rows, cols;

		node = of_find_node_by_name(profile_node, table_name);
		if (!node) {
		pr_err("%s not found\n", table_name);
		return -ENODEV;
		}

		rc = of_property_read_s32(node, "qcom,temperature", &temperature);
		if (rc < 0) {
		pr_err("Failed to read %s temperature\n", table_name);
		goto out;
		}

		if (temperature != table_temperatures[index]) {
		pr_err("Invalid table at wrong index %d temperature:%d\n",
		index, temperature);
		rc = -EINVAL;
		goto out;
		}

		rc = of_property_read_u32(node, "qcom,nrows", &rows);
		if (rc < 0) {
		pr_err("Failed to read %s\n", table_name);
		goto out;
		}
		bp_table->nrows = rows;

		rc = of_property_read_u32(node, "qcom,ncols", &cols);
		if (rc < 0) {
		pr_err("Failed to read %s\n", table_name);
		goto out;
		}
		bp_table->ncols = cols;

		rc = of_property_read_u32_array(node, "qcom,conv-factor",
		bp_table->unit_conv_factor,
		MAX_BP_LUT_COLS);
		if (rc < 0) {
		pr_err("Failed to read conv-factor\n");
		rc = -EINVAL;
		goto out;
		}

		prop = of_find_property(node, "qcom,data", NULL);
		if (!prop) {
		pr_err("Failed to find lut-data\n");
		rc = -EINVAL;
		goto out;
		}

		data = prop->value;

		for (j = 0; j < bp_table->nrows; j++) {
		for (k = 0; k < bp_table->ncols; k++)
		bp_table->table[j][k] = be32_to_cpup(data++);
		}

		pr_debug("Profile %s parsed rows=%d cols=%d\n", table_name,
		bp_table->nrows, bp_table->ncols);
		out:
		of_node_put(node);

		return rc;
		}

		static int qbg_parse_u32_dt_array(struct device_node *node,
		const char prop_name, int buf, int len)
		{
		int rc;

		rc = of_property_count_elems_of_size(node, prop_name, sizeof(u32));
		if (rc < 0) {
		pr_err("Property %s not found, rc=%d\n", prop_name, rc);
		return rc;
		} else if (rc != len) {
		pr_err("Incorrect length %d for %s, rc=%d\n", len, prop_name,
		rc);
		return -EINVAL;
		}

		rc = of_property_read_u32_array(node, prop_name, buf, len);
		if (rc < 0) {
		pr_err("Error in reading %s, rc=%d\n", prop_name, rc);
		return rc;
		}

		return 0;
		}

		static int qbg_parse_battery_profile(struct qbg_battery_data *battery)
		{
		struct device_node *node = battery->profile_node;
		struct device_node *child;
		struct battery_config *bp = &battery->bp;
		char buf[32];
		const char *battery_name = NULL;
		int rc, i = 0;
		u32 temp[2];

		rc = of_property_read_string(node, "qcom,battery-type", &battery_name);
		if (rc < 0) {
		pr_err("Failed to get battery type, rc=%d\n", rc);
		return rc;
		}
		strlcpy(bp->bp_profile_name, battery_name, MAX_PROFILE_NAME_LENGTH);

		rc = of_property_read_u32(node, "qcom,batt-id-kohm", &bp->bp_batt_id);
		if (rc < 0) {
		pr_err("Failed to get battery id, rc=%d\n", rc);
		return rc;
		}

		rc = of_property_read_u32(node, "qcom,capacity", &bp->capacity);
		if (rc < 0) {
		pr_err("Failed to get battery capacity, rc=%d\n", rc);
		return rc;
		}

		rc = of_property_read_u32(node, "qcom,checksum", &bp->bp_checksum);
		if (rc < 0) {
		pr_err("Failed to get checksum, rc=%d\n", rc);
		return rc;
		}

		rc = qbg_parse_u32_dt_array(node, "qcom,soh-range", temp, 2);
		if (rc < 0)
		return rc;

		if (temp[0] > 100 \|\| temp[1] > 100 \|\| (temp[0] > temp[1])) {
		pr_err("Incorrect SOH range [%d %d]\n", temp[0],
		temp[1]);
		return -ERANGE;
		}
		bp->soh_range_low = temp[0];
		bp->soh_range_high = temp[1];

		rc = qbg_parse_u32_dt_array(node, "qcom,battery-impedance", temp, 2);
		if (rc < 0)
		return rc;

		bp->normal_impedance = temp[0];
		bp->aged_impedance = temp[1];

		rc = qbg_parse_u32_dt_array(node, "qcom,battery-capacity", temp, 2);
		if (rc < 0)
		return rc;

		bp->normal_capacity = temp[0];
		bp->aged_capacity = temp[1];

		rc = of_property_read_u32(node, "qcom,recharge-soc-delta",
		&bp->recharge_soc_delta);
		if (rc < 0) {
		pr_err("Failed to get recharege soc delta, rc=%d\n",
		rc);
		return rc;
		}

		rc = of_property_read_u32(node, "qcom,recharge-vflt-delta",
		&bp->recharge_vflt_delta);
		if (rc < 0) {
		pr_err("Failed to get recharge vflt delta, rc=%d\n",
		rc);
		return rc;
		}

		rc = of_property_read_u32(node, "qcom,recharge-iterm-ma",
		&bp->recharge_iterm);
		if (rc < 0) {
		pr_err("Failed to get recharge iterm, rc=%d\n", rc);
		return rc;
		}

		for_each_available_child_of_node(battery->profile_node, child) {
		if (of_node_name_prefix(child, "qcom,bp-c-table"))
		battery->num_ctables++;
		else if (of_node_name_prefix(child, "qcom,bp-d-table"))
		battery->num_dtables++;
		}

		if (!battery->num_ctables \|\| !battery->num_dtables) {
		pr_err("ctable or dtable missing\n");
		return -EINVAL;
		}

		/* Battery profile contains additional table (table0) */
		if (battery->num_ctables)
		battery->num_ctables--;
		if (battery->num_dtables)
		battery->num_dtables--;

		battery->bp_discharge_tables = kcalloc(battery->num_dtables,
		sizeof(*battery->bp_discharge_tables), GFP_KERNEL);
		if (!battery->bp_discharge_tables)
		return -ENOMEM;

		battery->bp_charge_tables = kcalloc(battery->num_ctables,
		sizeof(*battery->bp_charge_tables), GFP_KERNEL);
		if (!battery->bp_charge_tables)
		return -ENOMEM;

		/* Parse c-table-0 */
		scnprintf(buf, sizeof(buf), "qcom,bp-c-table-0");
		rc = qbg_parse_table0(battery->profile_node, buf, &battery->table0[0]);
		if (rc < 0) {
		pr_err("Failed to parse %s, rc=%d\n", buf, rc);
		return rc;
		}

		/* Parse d-table-0 */
		scnprintf(buf, sizeof(buf), "qcom,bp-d-table-0");
		rc = qbg_parse_table0(battery->profile_node, buf, &battery->table0[1]);
		if (rc < 0) {
		pr_err("Failed to parse %s, rc=%d\n", buf, rc);
		goto cleanup_ctable;
		}

		for (i = 0; i < battery->num_dtables; i++) {
		battery->bp_discharge_tables[i] = kzalloc(
		sizeof(*battery->bp_discharge_tables[i]), GFP_KERNEL);
		if (!battery->bp_discharge_tables[i]) {
		rc = -ENOMEM;
		goto cleanup_ctable;
		}

		scnprintf(buf, sizeof(buf), "qcom,bp-d-table-%d", i + 1);

		rc = qbg_parse_table(battery->profile_node, i, buf,
		battery->bp_discharge_tables[i]);
		if (rc < 0) {
		pr_err("Failed to parse %s, rc=%d\n", buf, rc);
		goto cleanup_dtable;
		}
		}

		for (i = 0; i < battery->num_ctables; i++) {
		battery->bp_charge_tables[i] = kzalloc(
		sizeof(*battery->bp_charge_tables[i]), GFP_KERNEL);
		if (!battery->bp_charge_tables[i]) {
		rc = -ENOMEM;
		goto cleanup_ctable;
		}

		scnprintf(buf, sizeof(buf), "qcom,bp-c-table-%d", i + 1);

		rc = qbg_parse_table(battery->profile_node, i, buf,
		battery->bp_charge_tables[i]);
		if (rc < 0) {
		pr_err("Failed to parse %s, rc=%d\n", buf, rc);
		goto cleanup_ctable;
		}
		}

		return 0;

		cleanup_ctable:
		for (; i > 0; i--)
		kfree(battery->bp_charge_tables[i]);
		i = battery->num_dtables;
		cleanup_dtable:
		for (; i > 0; i--)
		kfree(battery->bp_discharge_tables[i]);

		return rc;
		}

		int qbg_batterydata_init(struct device_node *profile_node,
		struct qbg_battery_data *battery)
		{
		int rc = 0;

		/* char device to access battery-profile data */
		rc = alloc_chrdev_region(&battery->dev_no, 0, 1, "qbg_battery");
		if (rc < 0) {
		pr_err("Failed to allocate chrdev, rc=%d\n", rc);
		goto free_battery;
		}

		cdev_init(&battery->battery_cdev, &qbg_battery_data_fops);
		rc = cdev_add(&battery->battery_cdev, battery->dev_no, 1);
		if (rc) {
		pr_err("Failed to add battery_cdev, rc=%d\n", rc);
		goto unregister_chrdev;
		}

		battery->battery_class = class_create(THIS_MODULE, "qbg_battery");
		if (IS_ERR_OR_NULL(battery->battery_class)) {
		pr_err("Failed to create qbg-battery class (%d)\n",
		PTR_ERR(battery->battery_class));
		rc = -ENODEV;
		goto delete_cdev;
		}

		battery->battery_device = device_create(battery->battery_class, NULL,
		battery->dev_no, NULL,
		"qbg_battery");
		if (IS_ERR_OR_NULL(battery->battery_device)) {
		pr_err("Failed to create battery_device device (%d)\n",
		PTR_ERR(battery->battery_device));
		rc = -ENODEV;
		goto destroy_class;
		}

		battery->profile_node = profile_node;

		/* parse the battery profile */
		rc = qbg_parse_battery_profile(battery);
		if (rc < 0) {
		pr_err("Failed to parse battery profile, rc=%d\n", rc);
		goto destroy_device;
		}

		pr_info("QBG Battery-profile loaded, id:%d name:%s\n",
		battery->bp.bp_batt_id, battery->bp.bp_profile_name);

		return 0;

		destroy_device:
		device_destroy(battery->battery_class, battery->dev_no);
		destroy_class:
		class_destroy(battery->battery_class);
		delete_cdev:
		cdev_del(&battery->battery_cdev);
		unregister_chrdev:
		unregister_chrdev_region(battery->dev_no, 1);
		free_battery:
		kfree(battery);
		return rc;
		}

		void qbg_batterydata_exit(struct qbg_battery_data *battery)
		{
		int i;

		if (!battery) {
		pr_err("Battery cannot be null\n");
		return;
		}

		/* unregister the device node */
		device_destroy(battery->battery_class, battery->dev_no);
		class_destroy(battery->battery_class);
		cdev_del(&battery->battery_cdev);
		unregister_chrdev_region(battery->dev_no, 1);

		/* delete all the battery profile memory */
		for (i = 0; i < battery->num_ctables; i++)
		kfree(battery->bp_charge_tables[i]);

		for (i = 0; i < battery->num_dtables; i++)
		kfree(battery->bp_discharge_tables[i]);
		}

		int qbg_lookup_soc_ocv(struct qbg_battery_data battery, int pon_soc, int ocv, bool charging)
		{
		struct battery_data_table0 *lut;
		int i;

		*pon_soc = -EINVAL;

		lut = charging ? &battery->table0[0] : &battery->table0[1];
		for (i = 0; i < lut->ocv_length; i++) {
		if (ocv == lut->ocv[i]) {
		*pon_soc = lut->soc[i];
		break;
		} else if (is_between(lut->ocv[i], lut->ocv[i+1], ocv)) {
		*pon_soc = (lut->soc[i] + lut->soc[i+1]) / 2;
		break;
		}
		}

		if (*pon_soc == -EINVAL) {
		pr_debug("%d ocv wasn't found in the LUT returning 100%\n", ocv);
		*pon_soc = 10000;
		}

		return 0;
		}

drivers/power/supply/qcom/qbg-battery-profile.h

0 → 100644

+55 −0

Original line number	Diff line number	Diff line
		/* SPDX-License-Identifier: GPL-2.0-only */
		/*
		* Copyright (c) 2021 The Linux Foundation. All rights reserved.
		*/

		#ifndef __QBG_BATTERY_PROFILE_H__
		#define __QBG_BATTERY_PROFILE_H__

		#define is_between(left, right, value) \
		(((left) >= (right) && (left) >= (value) \
		&& (value) >= (right)) \
		\|\| ((left) <= (right) && (left) <= (value) \
		&& (value) <= (right)))

		struct battery_data_table0 {
		int soc_length;
		int ocv_length;
		int *soc;
		int *ocv;
		};

		/**
		* struct qbg_battery_data - Structure for QBG battery data
		* @dev_no: Device number for QBG battery char device
		* @profile_node: Pointer to devicetree node handle of profile
		* @battery_class: Pointer to battery class
		* @battery_device: Pointer to battery class device
		* @battery_cdev: QBG battery char device
		* @bp: QBG battery configuration
		* @bp_charge_tables: Charge tables in QBG battery profile
		* @bp_discharge_tables: Discharge tables in QBG battery profile
		* @table0: Two tables for PON OCV to SOC mapping
		* @num_ctables: Number of charge tables
		* @num_dtables: Number of discharge tables
		*/

		struct qbg_battery_data {
		dev_t dev_no;
		struct device_node *profile_node;
		struct class *battery_class;
		struct device *battery_device;
		struct cdev battery_cdev;
		struct battery_config bp;
		struct battery_data_table **bp_charge_tables;
		struct battery_data_table **bp_discharge_tables;
		struct battery_data_table0 table0[2];
		int num_ctables;
		int num_dtables;
		};

		int qbg_batterydata_init(struct device_node *node,
		struct qbg_battery_data *battery);
		void qbg_batterydata_exit(struct qbg_battery_data *battery);
		int qbg_lookup_soc_ocv(struct qbg_battery_data battery, int pon_soc, int ocv, bool charging);
		#endif /* __QBG_BATTERY_PROFILE_H__ */

drivers/power/supply/qcom/qbg-core.h

0 → 100644

+178 −0

Original line number	Diff line number	Diff line
		/* SPDX-License-Identifier: GPL-2.0-only */
		/*
		* Copyright (c) 2021 The Linux Foundation. All rights reserved.
		*/

		#ifndef __QBG_CORE_H__
		#define __QBG_CORE_H__

		#define qbg_dbg(chip, reason, fmt, ...) \
		do { \
		if (*chip->debug_mask & (reason)) \
		pr_err(fmt, ##__VA_ARGS__); \
		else \
		pr_debug(fmt, ##__VA_ARGS__); \
		} while (0)

		enum debug_mask {
		QBG_DEBUG_BUS_READ = BIT(0),
		QBG_DEBUG_BUS_WRITE = BIT(1),
		QBG_DEBUG_FIFO = BIT(2),
		QBG_DEBUG_IRQ = BIT(3),
		QBG_DEBUG_DEVICE = BIT(4),
		QBG_DEBUG_PROFILE = BIT(5),
		QBG_DEBUG_SOC = BIT(6),
		QBG_DEBUG_SDAM = BIT(7),
		QBG_DEBUG_STATUS = BIT(8),
		QBG_DEBUG_PON = BIT(9),
		};

		enum qbg_sdam {
		SDAM_CTRL0 = 0,
		SDAM_CTRL1,
		SDAM_DATA0,
		SDAM_DATA1,
		SDAM_DATA2,
		SDAM_DATA3,
		SDAM_DATA4,
		};

		/**
		* struct qti_qbg - Structure for QTI QBG device
		* @dev: Pointer to QBG device structure
		* @regmap: Pointer to regmap structure
		* @qbg_psy: Pointer to QBG power supply
		* @batt_psy: Pointer to Battery power supply
		* @qbg_class: Pointer to QBG class
		* @qbg_device: Pointer to QBG device
		* @qbg_cdev: Member for QBG char device
		* @dev_no: Device number for QBG char device
		* @batt_node: Pointer to battery device node
		* @indio_dev: Pointer to QBG IIO device
		* @iio_chan: Pointer to QBG IIO channels
		* @sdam: Pointer to multiple QBG SDAMs
		* @fifo: QBG FIFO data
		* @essential_params: QBG essential params
		* @status_change_work: Power supply status change work
		* @udata_work: User space data change work
		* @nb: Power supply notifier block
		* @kdata: QBG Kernel space data structure
		* @udata: QBG user space data structure
		* @battery: Pointer to QBG battery data structure
		* @fifo_lock: Lock for reading FIFO data
		* @data_lock: Lock for reading kdata from QBG char device
		* @batt_id_chan: IIO channel to read battery ID
		* @batt_temp_chan: IIO channel to read battery temperature
		* @rtc: RTC device to read real time
		* @last_fast_char_time: Timestamp of last time QBG in fast char mode
		* @qbg_wait_q: Wait queue for reads to QBG char device
		* @irq_name: QBG interrupt name
		* @batt_type_str: String array denoting battery type
		* @irq: QBG irq number
		* @base: Base address of QBG HW
		* @num_sdams: Number of sdams used for QBG
		* @batt_id_ohm: Battery resistance in ohms
		* @debug_mask: Debug mask to enable/disable debug prints
		* @pon_ocv: Power-on OCV of QBG device
		* @pon_ibat: Power-on current of QBG device
		* @pon_soc: Power-on SOC of QBG device
		* @soc: Monotonic SOC of QBG device
		* @batt_soc: Battery SOC
		* @sys_soc: Battery system SOC
		* @esr: Battery equivalent series resistance
		* @ocv_uv: Battery open circuit voltage
		* @voltage_now: Battery voltage
		* @current_now: Battery current
		* @tbat: Battery temperature
		* @charge_cycle_count: Battery charge cycle count
		* @nominal_capacity: Battery nominal capacity
		* @learned_capacity: Battery learned capacity
		* @ttf: Time to full
		* @tte: Time to empty
		* @soh: Battery state of health
		* @charge_type: Charging type
		* @float_volt_uv: Battery maximum voltage
		* @fastchg_curr_ma: Battery fast charge current
		* @vbat_cutoff_mv: Battery cutoff voltage
		* @ibat_cutoff_ma: Battery cutoff current
		* @vph_min_mv: Battery minimum power
		* @iterm_ma: Charge Termination current
		* @rconn_mohm: Battery connector resistance
		* @previous_ep_time: Previous timestamp when essential params stored
		* @current_time: Current time stamp
		* @profile_loaded: Flag to indicated battery profile is loaded
		* @battery_missing: Flag to indicate battery is missing
		* @data_ready: Flag to indicate QBG data is ready
		* @in_fast_char: Flag to indicate QBG is in fast char mode
		*/
		struct qti_qbg {
		struct device *dev;
		struct regmap *regmap;
		struct power_supply *qbg_psy;
		struct power_supply *batt_psy;
		struct class *qbg_class;
		struct device *qbg_device;
		struct cdev qbg_cdev;
		dev_t dev_no;
		struct device_node *batt_node;
		struct iio_dev *indio_dev;
		struct iio_chan_spec *iio_chan;
		struct nvmem_device **sdam;
		struct fifo_data fifo[MAX_FIFO_COUNT];
		struct qbg_essential_params essential_params;
		struct work_struct status_change_work;
		struct work_struct udata_work;
		struct notifier_block nb;
		struct qbg_kernel_data kdata;
		struct qbg_user_data udata;
		struct qbg_battery_data *battery;
		struct mutex fifo_lock;
		struct mutex data_lock;
		struct iio_channel *batt_id_chan;
		struct iio_channel *batt_temp_chan;
		struct rtc_device *rtc;
		ktime_t last_fast_char_time;
		wait_queue_head_t qbg_wait_q;
		const char *irq_name;
		const char *batt_type_str;
		int irq;
		u32 base;
		u32 sdam_base;
		u32 num_sdams;
		u32 num_data_sdams;
		u32 batt_id_ohm;
		u32 *debug_mask;
		int pon_ocv;
		int pon_ibat;
		int pon_tbat;
		int pon_soc;
		int soc;
		int batt_soc;
		int sys_soc;
		int esr;
		int ocv_uv;
		int voltage_now;
		int current_now;
		int tbat;
		int charge_cycle_count;
		int nominal_capacity;
		int learned_capacity;
		int ttf;
		int tte;
		int soh;
		int charge_type;
		int float_volt_uv;
		int fastchg_curr_ma;
		int vbat_cutoff_mv;
		int ibat_cutoff_ma;
		int vph_min_mv;
		int iterm_ma;
		int rconn_mohm;
		unsigned long previous_ep_time;
		unsigned long current_time;
		bool profile_loaded;
		bool battery_missing;
		bool data_ready;
		bool in_fast_char;
		};
		#endif /* __QBG_CORE_H__ */