power: tps80031-battery-gauge: Add battery gauge driver

Adding battery-gauge driver for TPS8003x controller

bug 841080

Original-Change-Id: Id65c3de88e6893005a8d7590fc7273cd7c43a1b3
Reviewed-on: http://git-master/r/48428
Reviewed-by: Laxman Dewangan <ldewangan@nvidia.com>
Tested-by: Syed Rafiuddin <srafiuddin@nvidia.com>

Rebase-Id: R231e287e3ffa10bf03f9b599ab9b80ffb2acd727

4 files changed, 423 insertions, 0 deletions

diff --git a/drivers/power/Kconfig b/drivers/power/Kconfig
index c47e58b89fce..b679e2d9785b 100644
--- a/drivers/power/Kconfig
+++ b/drivers/power/Kconfig
@@ -156,6 +156,14 @@ config CHARGER_TPS8003X
 	help
 	  Say Y here to enable support for battery charging with TPS80031x chips.
 
+config BATTERY_GAUGE_TPS8003X
+	tristate "TPS8003x battery gauge driver"
+	depends on MFD_TPS80031
+	default n
+	help
+	 Say Y here to enable support for battery gauge for TPS80031x chips.
+
+
 config BATTERY_DA9030
 	tristate "DA9030 battery driver"
 	depends on PMIC_DA903X
diff --git a/drivers/power/Makefile b/drivers/power/Makefile
index f599a513c63b..6c457346a537 100644
--- a/drivers/power/Makefile
+++ b/drivers/power/Makefile
@@ -25,6 +25,7 @@ obj-$(CONFIG_BATTERY_WM97XX)	+= wm97xx_battery.o
 obj-$(CONFIG_BATTERY_BQ20Z75)	+= bq20z75.o
 obj-$(CONFIG_BATTERY_BQ27x00)	+= bq27x00_battery.o
 obj-$(CONFIG_CHARGER_TPS8003X)	+= tps80031-charger.o
+obj-$(CONFIG_BATTERY_GAUGE_TPS8003X) += tps80031_battery_gauge.o
 obj-$(CONFIG_BATTERY_DA9030)	+= da9030_battery.o
 obj-$(CONFIG_BATTERY_MAX17040)	+= max17040_battery.o
 obj-$(CONFIG_BATTERY_MAX17042)	+= max17042_battery.o
diff --git a/drivers/power/tps80031_battery_gauge.c b/drivers/power/tps80031_battery_gauge.c
new file mode 100644
index 000000000000..0e3cc617229a
--- /dev/null
+++ b/drivers/power/tps80031_battery_gauge.c
@@ -0,0 +1,410 @@
+/*
+ * drivers/power/tps80031_battery_gauge.c
+ *
+ * Gas Gauge driver for TI's tps80031
+ *
+ * Copyright (c) 2011, NVIDIA Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ */
+#include <linux/kernel.h>
+#include <linux/platform_device.h>
+#include <linux/regulator/driver.h>
+#include <linux/err.h>
+#include <linux/regulator/machine.h>
+#include <linux/mutex.h>
+
+#include <linux/module.h>
+#include <linux/param.h>
+#include <linux/jiffies.h>
+#include <linux/workqueue.h>
+#include <linux/pm.h>
+#include <linux/i2c.h>
+#include <linux/slab.h>
+#include <linux/platform_device.h>
+#include <linux/power_supply.h>
+
+#include <linux/mfd/core.h>
+#include <linux/mfd/tps80031.h>
+
+#define CONTROLLER_STAT1	0xe3
+#define LINEAR_CHARGE_STS	0xde
+#define STS_HW_CONDITIONS	0x21
+#define TOGGLE1			0x90
+#define GPCH0_LSB		0x3b
+#define GPCH0_MSB		0x3c
+#define GPSELECT_ISB		0x35
+#define GPADC_CTRL		0x2e
+#define MISC1			0xe4
+#define CTRL_P1			0x36
+
+#define TPS80031_VBUS_DET	BIT(2)
+#define TPS80031_VAC_DET	BIT(3)
+#define TPS80031_STS_VYSMIN_HI	BIT(4)
+#define END_OF_CHARGE		BIT(5)
+
+#define DRIVER_VERSION		"1.1.0"
+#define BATTERY_POLL_PERIOD	30000
+
+struct tps80031_device_info {
+	struct device		*dev;
+	struct i2c_client	*client;
+	struct power_supply	bat;
+	struct power_supply	usb;
+	struct timer_list	battery_poll_timer;
+	uint32_t vsys;
+	uint8_t usb_online;
+	uint8_t usb_status;
+	uint8_t capacity_sts;
+	uint8_t health;
+	uint8_t sys_vlow_intr;
+};
+
+static enum power_supply_property tps80031_bat_props[] = {
+	POWER_SUPPLY_PROP_TECHNOLOGY,
+	POWER_SUPPLY_PROP_VOLTAGE_NOW,
+	POWER_SUPPLY_PROP_HEALTH,
+	POWER_SUPPLY_PROP_STATUS,
+	POWER_SUPPLY_PROP_CAPACITY,
+};
+
+static enum power_supply_property tps80031_usb_props[] = {
+	POWER_SUPPLY_PROP_ONLINE,
+};
+
+static uint32_t vsys_min_hi = 3700;
+
+static int tps80031_battery_capacity(struct tps80031_device_info *di,
+			union power_supply_propval *val)
+{
+	uint8_t hwsts, ret;
+
+	ret = tps80031_read(di->dev->parent, SLAVE_ID2, LINEAR_CHARGE_STS,
+								&hwsts);
+	if (ret < 0) {
+		dev_err(di->dev, "%s(): Failed in writin register 0x%02x\n",
+			__func__, LINEAR_CHARGE_STS);
+		return ret;
+	}
+	if (di->vsys < vsys_min_hi)
+		di->capacity_sts = 10;
+	else {
+		if (hwsts & END_OF_CHARGE)
+			di->capacity_sts = 100;
+		else
+			di->capacity_sts = 50;
+	}
+
+	if (di->sys_vlow_intr) {
+		di->capacity_sts = 10;
+		di->sys_vlow_intr = 0;
+	}
+
+	if (di->capacity_sts <= 10)
+		di->health = POWER_SUPPLY_HEALTH_DEAD;
+	else
+		di->health = POWER_SUPPLY_HEALTH_GOOD;
+
+	return  di->capacity_sts;
+}
+
+static int tps80031_gpadc_config(struct tps80031_device_info *di, uint8_t gpadc)
+{
+
+	uint8_t ret = 0;
+	ret = tps80031_write(di->dev->parent, SLAVE_ID2, TOGGLE1, 0x02);
+	if (ret < 0) {
+		dev_err(di->dev, "%s(): Failed in writin register 0x%02x\n",
+			__func__, TOGGLE1);
+		return ret;
+	}
+
+	ret = tps80031_write(di->dev->parent, SLAVE_ID2, GPSELECT_ISB, gpadc);
+	if (ret < 0) {
+		dev_err(di->dev, "%s(): Failed in writin register 0x%02x\n",
+			__func__, GPSELECT_ISB);
+		return ret;
+	}
+
+	ret = tps80031_write(di->dev->parent, SLAVE_ID2, GPADC_CTRL, 0xef);
+	if (ret < 0) {
+		dev_err(di->dev, "%s(): Failed in writin register 0x%02x\n",
+			__func__, GPADC_CTRL);
+		return ret;
+	}
+
+	ret = tps80031_write(di->dev->parent, SLAVE_ID1, MISC1, 0x02);
+	if (ret < 0) {
+		dev_err(di->dev, "%s(): Failed in writin register 0x%02x\n",
+			__func__, MISC1);
+		return ret;
+	}
+
+	ret = tps80031_write(di->dev->parent, SLAVE_ID2, CTRL_P1, 0x08);
+	if (ret < 0) {
+		dev_err(di->dev, "%s(): Failed in writin register 0x%02x\n",
+			__func__, CTRL_P1);
+		return ret;
+	}
+	return ret;
+	}
+
+static int tps80031_battery_voltage(struct tps80031_device_info *di,
+			union power_supply_propval *val)
+{
+	uint32_t voltage, ret = 0;
+	uint8_t lsb, msb;
+
+	ret = tps80031_gpadc_config(di, 0x07);
+	if (ret < 0) {
+		dev_err(di->dev, "Failed in gpadc config\n");
+		return ret;
+	}
+
+	ret = tps80031_read(di->dev->parent, SLAVE_ID2, GPCH0_LSB, &lsb);
+	if (ret < 0) {
+		dev_err(di->dev, "%s(): Failed in writin register 0x%02x\n",
+			__func__, GPCH0_LSB);
+		return ret;
+	}
+
+	ret = tps80031_read(di->dev->parent, SLAVE_ID2, GPCH0_MSB, &msb);
+	if (ret < 0) {
+		dev_err(di->dev, "%s(): Failed in writin register 0x%02x\n",
+			__func__, GPCH0_MSB);
+		return ret;
+	}
+
+	voltage = ((msb << 8) | lsb);
+	voltage = ((voltage * 1000) / 4096) * 5;
+
+	di->vsys = voltage;
+
+	return voltage;
+}
+
+#define to_tps80031_device_info_bat(x) container_of((x), \
+				struct tps80031_device_info, bat);
+
+static int tps80031_bat_get_property(struct power_supply *psy,
+	enum power_supply_property psp, union power_supply_propval *val)
+{
+	struct tps80031_device_info *di = to_tps80031_device_info_bat(psy);
+
+	switch (psp) {
+
+	case POWER_SUPPLY_PROP_TECHNOLOGY:
+		val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
+		break;
+
+	case POWER_SUPPLY_PROP_HEALTH:
+		val->intval = di->health;
+		break;
+
+	case POWER_SUPPLY_PROP_CAPACITY:
+		val->intval =  tps80031_battery_capacity(di, val);
+		break;
+
+	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
+		val->intval =  tps80031_battery_voltage(di, val);
+		break;
+
+	case POWER_SUPPLY_PROP_STATUS:
+		val->intval = di->usb_status;
+		break;
+
+	default:
+		return -EINVAL;
+	}
+	return 0;
+}
+
+#define to_tps80031_device_info_usb(x) container_of((x), \
+				struct tps80031_device_info, usb);
+
+static int tps80031_usb_get_property(struct power_supply *psy,
+		enum power_supply_property psp, union power_supply_propval *val)
+{
+	struct tps80031_device_info *di = to_tps80031_device_info_usb(psy);
+
+	switch (psp) {
+	case POWER_SUPPLY_PROP_ONLINE:
+		val->intval = di->usb_online;
+		break;
+	default:
+		return -EINVAL;
+	}
+	return 0;
+}
+
+static irqreturn_t tps80031_sys_vlow(int irq, void *data)
+{
+	struct tps80031_device_info *di = data;
+
+	di->sys_vlow_intr = 1;
+	power_supply_changed(&di->bat);
+	return IRQ_HANDLED;
+}
+
+static irqreturn_t tps80031_vbus_det(int irq, void *data)
+{
+	uint8_t value, ret;
+	struct tps80031_device_info *di = data;
+
+	ret = tps80031_read(di->dev->parent, SLAVE_ID2, CONTROLLER_STAT1,
+								&value);
+	if (ret < 0) {
+		dev_err(di->dev, "%s(): Failed in writin register 0x%02x\n",
+			__func__, CONTROLLER_STAT1);
+		return ret;
+	}
+
+	if ((value & TPS80031_VAC_DET) | (value & TPS80031_VBUS_DET)) {
+		di->usb_status = POWER_SUPPLY_STATUS_CHARGING;
+		di->health = POWER_SUPPLY_HEALTH_GOOD;
+		di->usb_online = 1;
+	} else {
+		di->usb_status = POWER_SUPPLY_STATUS_DISCHARGING;
+		di->usb_online = 0;
+	}
+	power_supply_changed(&di->usb);
+	power_supply_changed(&di->bat);
+
+	return IRQ_HANDLED;
+}
+
+static void battery_poll_timer_func(unsigned long pdi)
+{
+	struct tps80031_device_info *di = (void *)pdi;
+	power_supply_changed(&di->bat);
+	mod_timer(&di->battery_poll_timer,
+		jiffies + msecs_to_jiffies(BATTERY_POLL_PERIOD));
+}
+
+static int tps80031_battery_probe(struct platform_device *pdev)
+{
+	int err, ret = 0;
+	uint8_t retval;
+	struct device *dev = &pdev->dev;
+	struct tps80031_device_info *di;
+	struct tps80031_bg_platform_data *pdata = pdev->dev.platform_data;
+
+	di = kzalloc(sizeof(*di), GFP_KERNEL);
+	if (!di) {
+		dev_err(dev->parent, "failed to allocate device info data\n");
+		ret = -ENOMEM;
+	}
+
+	di->dev =  &pdev->dev;
+
+	ret = tps80031_read(di->dev->parent, SLAVE_ID2, CONTROLLER_STAT1,
+								&retval);
+	if (ret < 0) {
+		dev_err(di->dev, "%s(): Failed in writin register 0x%02x\n",
+			__func__, CONTROLLER_STAT1);
+		return ret;
+	}
+
+	if ((retval & TPS80031_VAC_DET) | (retval & TPS80031_VBUS_DET)) {
+		di->usb_status = POWER_SUPPLY_STATUS_CHARGING;
+		di->usb_online = 1;
+	} else {
+		di->usb_status = POWER_SUPPLY_STATUS_DISCHARGING;
+		di->usb_online = 0;
+	}
+
+	di->capacity_sts = 50;
+	di->health = POWER_SUPPLY_HEALTH_GOOD;
+
+	di->bat.name		= "tps80031-bat";
+	di->bat.type		= POWER_SUPPLY_TYPE_BATTERY;
+	di->bat.properties	= tps80031_bat_props;
+	di->bat.num_properties	= ARRAY_SIZE(tps80031_bat_props);
+	di->bat.get_property	= tps80031_bat_get_property;
+
+	retval = power_supply_register(dev->parent, &di->bat);
+	if (retval)
+		dev_err(dev->parent, "failed to register bat power supply\n");
+
+	di->usb.name		= "tps80031-usb";
+	di->usb.type		= POWER_SUPPLY_TYPE_USB;
+	di->usb.properties	= tps80031_usb_props;
+	di->usb.num_properties	= ARRAY_SIZE(tps80031_usb_props);
+	di->usb.get_property	= tps80031_usb_get_property;
+
+	retval = power_supply_register(dev->parent, &di->usb);
+	if (retval)
+		dev_err(dev->parent, "failed to register ac power supply\n");
+
+	dev_set_drvdata(&pdev->dev, di);
+
+	err = request_threaded_irq(pdata->irq_base + TPS80031_INT_VBUS_DET,
+				NULL, tps80031_vbus_det,
+					IRQF_ONESHOT, "tps80031_vbus_det", di);
+	if (err < 0)
+		dev_err(dev->parent, "request IRQ %d fail\n", pdata->irq_base);
+
+	err = request_threaded_irq(pdata->irq_base + TPS80031_INT_SYS_VLOW,
+				NULL, tps80031_sys_vlow,
+					IRQF_ONESHOT, "tps80031_sys_vlow", di);
+	if (err < 0)
+		dev_err(dev->parent, "request IRQ %d fail\n", pdata->irq_base);
+
+	setup_timer(&di->battery_poll_timer,
+		battery_poll_timer_func, (unsigned long) di);
+	mod_timer(&di->battery_poll_timer,
+		jiffies + msecs_to_jiffies(BATTERY_POLL_PERIOD));
+
+	dev_info(dev->parent, "support ver. %s enabled\n", DRIVER_VERSION);
+
+	return ret;
+}
+
+static int tps80031_battery_remove(struct platform_device *pdev)
+{
+	struct tps80031_device_info *di = dev_get_drvdata(&pdev->dev);
+
+	power_supply_unregister(&di->bat);
+	power_supply_unregister(&di->usb);
+	kfree(di);
+
+	return 0;
+}
+
+static struct platform_driver tps80031_battery_driver = {
+	.driver	= {
+		.name	= "tps80031-battery-gauge",
+		.owner	= THIS_MODULE,
+	},
+	.probe	= tps80031_battery_probe,
+	.remove = tps80031_battery_remove,
+};
+
+static int __init tps80031_battery_init(void)
+{
+	return platform_driver_register(&tps80031_battery_driver);
+}
+
+static void __exit tps80031_battery_exit(void)
+{
+	platform_driver_unregister(&tps80031_battery_driver);
+}
+
+module_init(tps80031_battery_init);
+module_exit(tps80031_battery_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Syed Rafiuddin <srafiuddin@nvidia.com> ");
+MODULE_DESCRIPTION("tps80031 battery gauge driver");
diff --git a/include/linux/mfd/tps80031.h b/include/linux/mfd/tps80031.h
index e62cfb30e988..994b38e29284 100644
--- a/include/linux/mfd/tps80031.h
+++ b/include/linux/mfd/tps80031.h
@@ -116,6 +116,10 @@ struct tps80031_platform_data {
 	struct tps80031_32kclock_plat_data *clk32k_pdata;
 };
 
+struct tps80031_bg_platform_data {
+	int irq_base;
+};
+
 /*
  * NOTE: the functions below are not intended for use outside
  * of the TPS80031 sub-device drivers