Message-Id: <201208020849.q728nhDc007814@latitude.olech.com>
Date:	Thu, 2 Aug 2012 09:48:56 +0100
From:	Anthony Olech <anthony.olech.opensource@...semi.com>
To:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
Cc:	LKML <linux-kernel@...r.kernel.org>
Subject: [NEW DRIVER V1 3/7] DA9058 POWER driver

This is the POWER component driver of the Dialog DA9058 PMIC.
This driver is just one component of the whole DA9058 PMIC driver.
It depends on the core DA9058 MFD driver.

Signed-off-by: Tony Olech (at Home) <tony@...ch.com>
---
 drivers/power/Kconfig        |   10 +
 drivers/power/Makefile       |    1 +
 drivers/power/da9058_power.c |  403 ++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 414 insertions(+), 0 deletions(-)
 create mode 100644 drivers/power/da9058_power.c

diff --git a/drivers/power/Kconfig b/drivers/power/Kconfig
index e3a3b49..e0b4d34 100644
--- a/drivers/power/Kconfig
+++ b/drivers/power/Kconfig
@@ -8,6 +8,16 @@ menuconfig POWER_SUPPLY
 
 if POWER_SUPPLY
 
+config BATTERY_DA9058
+	tristate "DA9058 battery charger support"
+	depends on MFD_DA9058
+	help
+	  Say Y here to enable support for the battery charger in the Dialog
+	  DA9058 PMIC.
+
+	  To compile this driver as a module, choose M here: the module
+	  will be called da9058_power.
+
 config POWER_SUPPLY_DEBUG
 	bool "Power supply debug"
 	help
diff --git a/drivers/power/Makefile b/drivers/power/Makefile
index b6b2434..8a4a049 100644
--- a/drivers/power/Makefile
+++ b/drivers/power/Makefile
@@ -14,6 +14,7 @@ obj-$(CONFIG_WM831X_POWER)	+= wm831x_power.o
 obj-$(CONFIG_WM8350_POWER)	+= wm8350_power.o
 obj-$(CONFIG_TEST_POWER)	+= test_power.o
 
+obj-$(CONFIG_BATTERY_DA9058)	+= da9058_power.o
 obj-$(CONFIG_BATTERY_DS2760)	+= ds2760_battery.o
 obj-$(CONFIG_BATTERY_DS2780)	+= ds2780_battery.o
 obj-$(CONFIG_BATTERY_DS2781)	+= ds2781_battery.o
diff --git a/drivers/power/da9058_power.c b/drivers/power/da9058_power.c
new file mode 100644
index 0000000..5adfe07
--- /dev/null
+++ b/drivers/power/da9058_power.c
@@ -0,0 +1,403 @@
+/*
+ *  Copyright (C) 2012 Dialog Semiconductor Ltd.
+ *
+ *  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.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/power_supply.h>
+#include <linux/slab.h>
+#include <linux/mfd/core.h>
+
+#include <linux/mfd/da9058/version.h>
+#include <linux/mfd/da9058/registers.h>
+#include <linux/mfd/da9058/core.h>
+#include <linux/mfd/da9058/irq.h>
+#include <linux/mfd/da9058/bat.h>
+
+struct da9058_power {
+	struct da9058 *da9058;
+	struct platform_device *pdev;
+	struct power_supply battery;
+
+	int battery_type;
+	u8 illegalbattery;
+	u8 health;
+	u16 bat_temp;
+	u16 bat_voltage;
+	u8 cal_capacity;
+	int bat_low_limit;
+	int use_automatic_adc;
+	int temperature_points;
+	struct da9058_temp_capacity (*temp_tables)[];
+};
+
+static inline u8 bat_temp_reg_to_C(u16 value)
+{
+	return 55 - value;
+}
+
+static inline u8 bat_mV_to_reg(u16 value)
+{
+	return ((value - 4100) / 100) << 4;
+}
+
+static inline u8 bat_drop_mV_to_reg(u16 value)
+{
+	return ((value - 100) / 100) << 6;
+}
+
+static inline u16 bat_reg_to_mV(u8 value)
+{
+	return (value * 100) + 4100;
+}
+
+static inline u16 bat_drop_reg_to_mV(u8 value)
+{
+	return (value * 100) + 100;
+}
+
+static inline u8 vbat_thr_mV_to_reg(u16 value)
+{
+	return (value - 2500) / 8;
+}
+
+static inline u16 vddout_reg_to_mV(u8 value)
+{
+	return (value * 8) + 2500;
+}
+
+static inline u16 volt_bit_reg_to_mV(u16 value)
+{
+	return (value * 2) + 2500;
+}
+
+static inline u16 volt_reg_to_mV(u16 value)
+{
+	return (((value * 610 * 100) / 115) + 2400000) / 1000;
+}
+
+static inline u16 volt_10bit_reg_to_mV(u16 value)
+{
+	return (((value * 1510 * 100) / 75) + 2400000) / 1000;
+}
+
+static inline u8 bit8_mV_to_reg(u16 value)
+{
+	return (value * 2500) / 256000;
+}
+
+/*
+ *  to convert the ADC reading to milliVolts:
+ *  0000MMMMMMMMLL00 for automatic conversion
+ *  0000MMMMMMMMLLLL for manual conversion
+ *  2.5Volts == 0x0000 --> 2500
+ *  4.5Volts == 0x0FFF --> 4500
+ */
+static int da9058_read_battery_millivolts(struct da9058_power *power)
+{
+	struct da9058 *da9058 = power->da9058;
+	int vbat;
+	int ret;
+
+	ret = da9058_adc_read(da9058, DA9058_ADCMAN_MUXSEL_VBAT,
+				power->use_automatic_adc, &vbat);
+
+	if (ret)
+		return ret;
+
+	power->bat_voltage = (2500*0x0FFF + vbat*2000)/0x0FFF;
+
+	return 0;
+}
+
+static int da9058_battery_temperature_tbat(struct da9058_power *power)
+{
+	struct da9058 *da9058 = power->da9058;
+	int temp;
+	int ret;
+
+	ret = da9058_adc_read(da9058, DA9058_ADCMAN_MUXSEL_TEMP,
+				power->use_automatic_adc, &temp);
+
+	if (ret)
+		return ret;
+
+	power->bat_temp = temp;
+
+	return 0;
+}
+
+static u32 interpolated(u32 vbat_lower, u32 vbat_upper, u32 level_lower,
+			u32 level_upper, u32 vbat)
+{
+	s32 temp;
+
+	/*apply formula y= yk + (x <96> xk) * (yk+1 <96> yk)/(xk+1 - xk) */
+
+	temp = ((level_upper - level_lower) * 1000)/(vbat_upper - vbat_lower);
+	temp = level_lower + (((vbat - vbat_lower) * temp) / 1000);
+
+	return temp;
+}
+
+static int da9058_get_bat_level(struct da9058_power *power)
+{
+	int ret;
+
+	u16 tbat;
+	u16 vbat;
+	u32 vbat_lower = 0, vbat_upper = 0, level_upper =
+		0, level_lower, level = 0;
+	u8 access_index = 0, index = 0, flag = 0;
+
+	ret = da9058_read_battery_millivolts(power);
+	if (ret)
+		return ret;
+
+	vbat = power->bat_voltage;
+
+	ret = da9058_battery_temperature_tbat(power);
+	if (ret)
+		return ret;
+
+	tbat = power->bat_temp;
+
+	do {
+		if ((tbat + tbat) <=
+			((*power->temp_tables)[access_index].temperature +
+			(*power->temp_tables)[access_index + 1].temperature))
+			break;
+
+	} while (++access_index < (power->temperature_points - 1));
+
+	if (vbat >= (*power->temp_tables)[access_index].capacity[0][0]) {
+		power->cal_capacity = 100;
+		return 0;
+	}
+	if (vbat <=
+		(*power->temp_tables)[access_index].
+		capacity[DA9058_LOOK_UP_TABLE_SIZE - 1][0]) {
+		power->cal_capacity = 0;
+		return 0;
+	}
+	flag = 0;
+
+	for (index = 0; index < (DA9058_LOOK_UP_TABLE_SIZE - 1); index++) {
+		struct da9058_temp_capacity *t =
+					&(*power->temp_tables)[access_index];
+
+		if ((vbat <= t->capacity[index][0])
+			&& (vbat >= t->capacity[index + 1][0])) {
+			vbat_upper = t->capacity[index][0];
+			vbat_lower = t->capacity[index + 1][0];
+			level_upper = t->capacity[index][1];
+			level_lower = t->capacity[index + 1][1];
+			flag = 1;
+			break;
+		}
+	}
+	if (!flag)
+		return -EIO;
+
+	level = interpolated(vbat_lower, vbat_upper, level_lower, level_upper,
+				vbat);
+	power->cal_capacity = level;
+	return 0;
+}
+
+static int da9058_bat_check_health(struct da9058_power *power)
+{
+	int ret;
+
+	ret = da9058_read_battery_millivolts(power);
+	if (ret) {
+		power->health = POWER_SUPPLY_HEALTH_UNKNOWN;
+		goto exit;
+	}
+
+	if (power->bat_voltage < 2850) {
+		power->health = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
+		goto exit;
+	}
+
+	ret = da9058_get_bat_level(power);
+	if (ret) {
+		power->health = POWER_SUPPLY_HEALTH_UNKNOWN;
+		goto exit;
+	}
+
+	if (power->health != POWER_SUPPLY_HEALTH_OVERHEAT) {
+		if (power->illegalbattery)
+			power->health = POWER_SUPPLY_HEALTH_UNKNOWN;
+		else if (power->cal_capacity < power->bat_low_limit)
+			power->health = POWER_SUPPLY_HEALTH_DEAD;
+		else
+			power->health = POWER_SUPPLY_HEALTH_GOOD;
+	}
+exit:
+	return ret;
+}
+
+static int da9058_bat_get_property(struct power_supply *psy,
+					enum power_supply_property psp,
+					union power_supply_propval *val)
+{
+	struct da9058_power *power = dev_get_drvdata(psy->dev->parent);
+	int ret;
+
+	switch (psp) {
+	case POWER_SUPPLY_PROP_PRESENT:
+		ret = 0;
+		if (power->illegalbattery)
+			val->intval = 0;
+		else
+			val->intval = 1;
+		break;
+	case POWER_SUPPLY_PROP_TECHNOLOGY:
+		ret = 0;
+		val->intval = power->battery_type;
+		break;
+	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
+		ret = da9058_read_battery_millivolts(power);
+		val->intval = power->bat_voltage;
+		break;
+	case POWER_SUPPLY_PROP_HEALTH:
+		ret = da9058_bat_check_health(power);
+		val->intval = power->health;
+		break;
+	case POWER_SUPPLY_PROP_CAPACITY:
+		ret = da9058_get_bat_level(power);
+		val->intval = power->cal_capacity;
+		break;
+	case POWER_SUPPLY_PROP_TEMP:
+		ret = da9058_battery_temperature_tbat(power);
+		val->intval = power->bat_temp;
+		break;
+	default:
+		ret = -EINVAL;
+		break;
+	}
+
+	return ret;
+}
+
+static enum power_supply_property da9058_bat_props[] = {
+	POWER_SUPPLY_PROP_PRESENT,
+	POWER_SUPPLY_PROP_TECHNOLOGY,
+	POWER_SUPPLY_PROP_VOLTAGE_NOW,
+	POWER_SUPPLY_PROP_HEALTH,
+	POWER_SUPPLY_PROP_CAPACITY,
+	POWER_SUPPLY_PROP_TEMP,
+};
+
+static __devinit int da9058_power_probe(struct platform_device *pdev)
+{
+	struct da9058 *da9058 = dev_get_drvdata(pdev->dev.parent);
+	const struct mfd_cell *cell = mfd_get_cell(pdev);
+	struct da9058_power_pdata *power_pdata;
+	struct da9058_power *power;
+	struct power_supply *battery;
+	int ret = 0;
+
+	if (cell == NULL) {
+		ret = -ENODEV;
+		goto exit;
+	}
+
+	power_pdata = cell->platform_data;
+
+	if (power_pdata == NULL) {
+		ret = -EINVAL;
+		goto exit;
+	}
+
+	dev_info(&pdev->dev, "BAT type=%d monitored by %s ADC conversion",
+					power_pdata->battery_type,
+		power_pdata->use_automatic_adc ? "automatic" : "manual");
+
+	power = devm_kzalloc(&pdev->dev, sizeof(struct da9058_power),
+				GFP_KERNEL);
+	if (!power) {
+		ret = -ENOMEM;
+		goto exit;
+	}
+
+	platform_set_drvdata(pdev, power);
+
+	power->da9058 = da9058;
+	power->pdev = pdev;
+	power->battery_type = power_pdata->battery_type;
+	power->bat_low_limit = power_pdata->bat_low_limit;
+	power->use_automatic_adc = power_pdata->use_automatic_adc;
+	power->temperature_points =
+		power_pdata->lookup_tables->temperature_points;
+	power->temp_tables = power_pdata->lookup_tables->temp_tables;
+
+	battery = &power->battery;
+
+	battery->name = "da9058-battery";
+	battery->properties = da9058_bat_props;
+	battery->num_properties = ARRAY_SIZE(da9058_bat_props);
+	battery->get_property = da9058_bat_get_property;
+	battery->use_for_apm = 1;
+
+	if (!power_pdata->use_automatic_adc) {
+		u8 adc_ctrl;
+		ret = da9058_reg_read(da9058, DA9058_ADCCONT_REG, &adc_ctrl);
+		if (ret)
+			goto err;
+
+		if (!(adc_ctrl & DA9058_ADCCONT_TEMPISRCEN)) {
+			dev_err(&power->pdev->dev,
+				"TEMP ADC must be a resistance\n");
+			goto err;
+		}
+	}
+
+	ret = power_supply_register(&pdev->dev, battery);
+	if (ret) {
+		dev_err(&power->pdev->dev,
+			"failed to register da9058-power driver: %d\n", ret);
+		goto err;
+	}
+
+	power->illegalbattery = 0;
+
+	goto exit;
+
+err:
+	platform_set_drvdata(pdev, NULL);
+exit:
+	return ret;
+}
+
+static __devexit int da9058_power_remove(struct platform_device *pdev)
+{
+	struct da9058_power *power = platform_get_drvdata(pdev);
+
+	power_supply_unregister(&power->battery);
+	return 0;
+}
+
+static struct platform_driver da9058_power_driver = {
+	.probe = da9058_power_probe,
+	.remove = __devexit_p(da9058_power_remove),
+	.driver = {
+		.name = "da9058-power",
+		.owner = THIS_MODULE,
+	},
+};
+
+module_platform_driver(da9058_power_driver);
+
+MODULE_DESCRIPTION("Dialog DA9058 PMIC Battery Driver");
+MODULE_AUTHOR("Anthony Olech <Anthony.Olech@...semi.com>");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:da9058-power");
-- 
end-of-patch for NEW DRIVER V1

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