1 files changed, 425 insertions, 0 deletions

diff --git a/drivers/power/supply/jz4740-battery.c b/drivers/power/supply/jz4740-battery.c
new file mode 100644
index 000000000000..88f04f4d1a70
--- /dev/null
+++ b/drivers/power/supply/jz4740-battery.c
@@ -0,0 +1,425 @@
+/*
+ * Battery measurement code for Ingenic JZ SOC.
+ *
+ * Copyright (C) 2009 Jiejing Zhang <kzjeef@gmail.com>
+ * Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>
+ *
+ * based on tosa_battery.c
+ *
+ * Copyright (C) 2008 Marek Vasut <marek.vasut@gmail.com>
+*
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/io.h>
+
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/gpio.h>
+#include <linux/mfd/core.h>
+#include <linux/power_supply.h>
+
+#include <linux/power/jz4740-battery.h>
+#include <linux/jz4740-adc.h>
+
+struct jz_battery {
+	struct jz_battery_platform_data *pdata;
+	struct platform_device *pdev;
+
+	void __iomem *base;
+
+	int irq;
+	int charge_irq;
+
+	const struct mfd_cell *cell;
+
+	int status;
+	long voltage;
+
+	struct completion read_completion;
+
+	struct power_supply *battery;
+	struct power_supply_desc battery_desc;
+	struct delayed_work work;
+
+	struct mutex lock;
+};
+
+static inline struct jz_battery *psy_to_jz_battery(struct power_supply *psy)
+{
+	return power_supply_get_drvdata(psy);
+}
+
+static irqreturn_t jz_battery_irq_handler(int irq, void *devid)
+{
+	struct jz_battery *battery = devid;
+
+	complete(&battery->read_completion);
+	return IRQ_HANDLED;
+}
+
+static long jz_battery_read_voltage(struct jz_battery *battery)
+{
+	long t;
+	unsigned long val;
+	long voltage;
+
+	mutex_lock(&battery->lock);
+
+	reinit_completion(&battery->read_completion);
+
+	enable_irq(battery->irq);
+	battery->cell->enable(battery->pdev);
+
+	t = wait_for_completion_interruptible_timeout(&battery->read_completion,
+		HZ);
+
+	if (t > 0) {
+		val = readw(battery->base) & 0xfff;
+
+		if (battery->pdata->info.voltage_max_design <= 2500000)
+			val = (val * 78125UL) >> 7UL;
+		else
+			val = ((val * 924375UL) >> 9UL) + 33000;
+		voltage = (long)val;
+	} else {
+		voltage = t ? t : -ETIMEDOUT;
+	}
+
+	battery->cell->disable(battery->pdev);
+	disable_irq(battery->irq);
+
+	mutex_unlock(&battery->lock);
+
+	return voltage;
+}
+
+static int jz_battery_get_capacity(struct power_supply *psy)
+{
+	struct jz_battery *jz_battery = psy_to_jz_battery(psy);
+	struct power_supply_info *info = &jz_battery->pdata->info;
+	long voltage;
+	int ret;
+	int voltage_span;
+
+	voltage = jz_battery_read_voltage(jz_battery);
+
+	if (voltage < 0)
+		return voltage;
+
+	voltage_span = info->voltage_max_design - info->voltage_min_design;
+	ret = ((voltage - info->voltage_min_design) * 100) / voltage_span;
+
+	if (ret > 100)
+		ret = 100;
+	else if (ret < 0)
+		ret = 0;
+
+	return ret;
+}
+
+static int jz_battery_get_property(struct power_supply *psy,
+	enum power_supply_property psp, union power_supply_propval *val)
+{
+	struct jz_battery *jz_battery = psy_to_jz_battery(psy);
+	struct power_supply_info *info = &jz_battery->pdata->info;
+	long voltage;
+
+	switch (psp) {
+	case POWER_SUPPLY_PROP_STATUS:
+		val->intval = jz_battery->status;
+		break;
+	case POWER_SUPPLY_PROP_TECHNOLOGY:
+		val->intval = jz_battery->pdata->info.technology;
+		break;
+	case POWER_SUPPLY_PROP_HEALTH:
+		voltage = jz_battery_read_voltage(jz_battery);
+		if (voltage < info->voltage_min_design)
+			val->intval = POWER_SUPPLY_HEALTH_DEAD;
+		else
+			val->intval = POWER_SUPPLY_HEALTH_GOOD;
+		break;
+	case POWER_SUPPLY_PROP_CAPACITY:
+		val->intval = jz_battery_get_capacity(psy);
+		break;
+	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
+		val->intval = jz_battery_read_voltage(jz_battery);
+		if (val->intval < 0)
+			return val->intval;
+		break;
+	case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
+		val->intval = info->voltage_max_design;
+		break;
+	case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
+		val->intval = info->voltage_min_design;
+		break;
+	case POWER_SUPPLY_PROP_PRESENT:
+		val->intval = 1;
+		break;
+	default:
+		return -EINVAL;
+	}
+	return 0;
+}
+
+static void jz_battery_external_power_changed(struct power_supply *psy)
+{
+	struct jz_battery *jz_battery = psy_to_jz_battery(psy);
+
+	mod_delayed_work(system_wq, &jz_battery->work, 0);
+}
+
+static irqreturn_t jz_battery_charge_irq(int irq, void *data)
+{
+	struct jz_battery *jz_battery = data;
+
+	mod_delayed_work(system_wq, &jz_battery->work, 0);
+
+	return IRQ_HANDLED;
+}
+
+static void jz_battery_update(struct jz_battery *jz_battery)
+{
+	int status;
+	long voltage;
+	bool has_changed = false;
+	int is_charging;
+
+	if (gpio_is_valid(jz_battery->pdata->gpio_charge)) {
+		is_charging = gpio_get_value(jz_battery->pdata->gpio_charge);
+		is_charging ^= jz_battery->pdata->gpio_charge_active_low;
+		if (is_charging)
+			status = POWER_SUPPLY_STATUS_CHARGING;
+		else
+			status = POWER_SUPPLY_STATUS_NOT_CHARGING;
+
+		if (status != jz_battery->status) {
+			jz_battery->status = status;
+			has_changed = true;
+		}
+	}
+
+	voltage = jz_battery_read_voltage(jz_battery);
+	if (voltage >= 0 && abs(voltage - jz_battery->voltage) > 50000) {
+		jz_battery->voltage = voltage;
+		has_changed = true;
+	}
+
+	if (has_changed)
+		power_supply_changed(jz_battery->battery);
+}
+
+static enum power_supply_property jz_battery_properties[] = {
+	POWER_SUPPLY_PROP_STATUS,
+	POWER_SUPPLY_PROP_TECHNOLOGY,
+	POWER_SUPPLY_PROP_HEALTH,
+	POWER_SUPPLY_PROP_CAPACITY,
+	POWER_SUPPLY_PROP_VOLTAGE_NOW,
+	POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
+	POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
+	POWER_SUPPLY_PROP_PRESENT,
+};
+
+static void jz_battery_work(struct work_struct *work)
+{
+	/* Too small interval will increase system workload */
+	const int interval = HZ * 30;
+	struct jz_battery *jz_battery = container_of(work, struct jz_battery,
+					    work.work);
+
+	jz_battery_update(jz_battery);
+	schedule_delayed_work(&jz_battery->work, interval);
+}
+
+static int jz_battery_probe(struct platform_device *pdev)
+{
+	int ret = 0;
+	struct jz_battery_platform_data *pdata = pdev->dev.parent->platform_data;
+	struct power_supply_config psy_cfg = {};
+	struct jz_battery *jz_battery;
+	struct power_supply_desc *battery_desc;
+	struct resource *mem;
+
+	if (!pdata) {
+		dev_err(&pdev->dev, "No platform_data supplied\n");
+		return -ENXIO;
+	}
+
+	jz_battery = devm_kzalloc(&pdev->dev, sizeof(*jz_battery), GFP_KERNEL);
+	if (!jz_battery) {
+		dev_err(&pdev->dev, "Failed to allocate driver structure\n");
+		return -ENOMEM;
+	}
+
+	jz_battery->cell = mfd_get_cell(pdev);
+
+	jz_battery->irq = platform_get_irq(pdev, 0);
+	if (jz_battery->irq < 0) {
+		dev_err(&pdev->dev, "Failed to get platform irq: %d\n", ret);
+		return jz_battery->irq;
+	}
+
+	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+
+	jz_battery->base = devm_ioremap_resource(&pdev->dev, mem);
+	if (IS_ERR(jz_battery->base))
+		return PTR_ERR(jz_battery->base);
+
+	battery_desc = &jz_battery->battery_desc;
+	battery_desc->name = pdata->info.name;
+	battery_desc->type = POWER_SUPPLY_TYPE_BATTERY;
+	battery_desc->properties	= jz_battery_properties;
+	battery_desc->num_properties	= ARRAY_SIZE(jz_battery_properties);
+	battery_desc->get_property	= jz_battery_get_property;
+	battery_desc->external_power_changed =
+					jz_battery_external_power_changed;
+	battery_desc->use_for_apm	= 1;
+
+	psy_cfg.drv_data = jz_battery;
+
+	jz_battery->pdata = pdata;
+	jz_battery->pdev = pdev;
+
+	init_completion(&jz_battery->read_completion);
+	mutex_init(&jz_battery->lock);
+
+	INIT_DELAYED_WORK(&jz_battery->work, jz_battery_work);
+
+	ret = request_irq(jz_battery->irq, jz_battery_irq_handler, 0, pdev->name,
+			jz_battery);
+	if (ret) {
+		dev_err(&pdev->dev, "Failed to request irq %d\n", ret);
+		return ret;
+	}
+	disable_irq(jz_battery->irq);
+
+	if (gpio_is_valid(pdata->gpio_charge)) {
+		ret = gpio_request(pdata->gpio_charge, dev_name(&pdev->dev));
+		if (ret) {
+			dev_err(&pdev->dev, "charger state gpio request failed.\n");
+			goto err_free_irq;
+		}
+		ret = gpio_direction_input(pdata->gpio_charge);
+		if (ret) {
+			dev_err(&pdev->dev, "charger state gpio set direction failed.\n");
+			goto err_free_gpio;
+		}
+
+		jz_battery->charge_irq = gpio_to_irq(pdata->gpio_charge);
+
+		if (jz_battery->charge_irq >= 0) {
+			ret = request_irq(jz_battery->charge_irq,
+				    jz_battery_charge_irq,
+				    IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
+				    dev_name(&pdev->dev), jz_battery);
+			if (ret) {
+				dev_err(&pdev->dev, "Failed to request charge irq: %d\n", ret);
+				goto err_free_gpio;
+			}
+		}
+	} else {
+		jz_battery->charge_irq = -1;
+	}
+
+	if (jz_battery->pdata->info.voltage_max_design <= 2500000)
+		jz4740_adc_set_config(pdev->dev.parent, JZ_ADC_CONFIG_BAT_MB,
+			JZ_ADC_CONFIG_BAT_MB);
+	else
+		jz4740_adc_set_config(pdev->dev.parent, JZ_ADC_CONFIG_BAT_MB, 0);
+
+	jz_battery->battery = power_supply_register(&pdev->dev, battery_desc,
+							&psy_cfg);
+	if (IS_ERR(jz_battery->battery)) {
+		dev_err(&pdev->dev, "power supply battery register failed.\n");
+		ret = PTR_ERR(jz_battery->battery);
+		goto err_free_charge_irq;
+	}
+
+	platform_set_drvdata(pdev, jz_battery);
+	schedule_delayed_work(&jz_battery->work, 0);
+
+	return 0;
+
+err_free_charge_irq:
+	if (jz_battery->charge_irq >= 0)
+		free_irq(jz_battery->charge_irq, jz_battery);
+err_free_gpio:
+	if (gpio_is_valid(pdata->gpio_charge))
+		gpio_free(jz_battery->pdata->gpio_charge);
+err_free_irq:
+	free_irq(jz_battery->irq, jz_battery);
+	return ret;
+}
+
+static int jz_battery_remove(struct platform_device *pdev)
+{
+	struct jz_battery *jz_battery = platform_get_drvdata(pdev);
+
+	cancel_delayed_work_sync(&jz_battery->work);
+
+	if (gpio_is_valid(jz_battery->pdata->gpio_charge)) {
+		if (jz_battery->charge_irq >= 0)
+			free_irq(jz_battery->charge_irq, jz_battery);
+		gpio_free(jz_battery->pdata->gpio_charge);
+	}
+
+	power_supply_unregister(jz_battery->battery);
+
+	free_irq(jz_battery->irq, jz_battery);
+
+	return 0;
+}
+
+#ifdef CONFIG_PM
+static int jz_battery_suspend(struct device *dev)
+{
+	struct jz_battery *jz_battery = dev_get_drvdata(dev);
+
+	cancel_delayed_work_sync(&jz_battery->work);
+	jz_battery->status = POWER_SUPPLY_STATUS_UNKNOWN;
+
+	return 0;
+}
+
+static int jz_battery_resume(struct device *dev)
+{
+	struct jz_battery *jz_battery = dev_get_drvdata(dev);
+
+	schedule_delayed_work(&jz_battery->work, 0);
+
+	return 0;
+}
+
+static const struct dev_pm_ops jz_battery_pm_ops = {
+	.suspend	= jz_battery_suspend,
+	.resume		= jz_battery_resume,
+};
+
+#define JZ_BATTERY_PM_OPS (&jz_battery_pm_ops)
+#else
+#define JZ_BATTERY_PM_OPS NULL
+#endif
+
+static struct platform_driver jz_battery_driver = {
+	.probe		= jz_battery_probe,
+	.remove		= jz_battery_remove,
+	.driver = {
+		.name = "jz4740-battery",
+		.pm = JZ_BATTERY_PM_OPS,
+	},
+};
+
+module_platform_driver(jz_battery_driver);
+
+MODULE_ALIAS("platform:jz4740-battery");
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
+MODULE_DESCRIPTION("JZ4740 SoC battery driver");