POWER: Add JZ4740 battery driver.
Add support for the battery voltage measurement part of the JZ4740 ADC unit.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Acked-by: Anton Vorontsov <cbouatmailru@gmail.com>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/1416/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
diff --git a/drivers/power/jz4740-battery.c b/drivers/power/jz4740-battery.c
new file mode 100644
index 0000000..20c4b95
--- /dev/null
+++ b/drivers/power/jz4740-battery.c
@@ -0,0 +1,445 @@
+/*
+ * 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/delay.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;
+
+ struct resource *mem;
+ void __iomem *base;
+
+ int irq;
+ int charge_irq;
+
+ struct mfd_cell *cell;
+
+ int status;
+ long voltage;
+
+ struct completion read_completion;
+
+ struct power_supply battery;
+ struct delayed_work work;
+};
+
+static inline struct jz_battery *psy_to_jz_battery(struct power_supply *psy)
+{
+ return container_of(psy, struct jz_battery, battery);
+}
+
+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)
+{
+ unsigned long t;
+ unsigned long val;
+ long voltage;
+
+ INIT_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);
+
+ 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);
+
+ cancel_delayed_work(&jz_battery->work);
+ schedule_delayed_work(&jz_battery->work, 0);
+}
+
+static irqreturn_t jz_battery_charge_irq(int irq, void *data)
+{
+ struct jz_battery *jz_battery = data;
+
+ cancel_delayed_work(&jz_battery->work);
+ schedule_delayed_work(&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 (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 __devinit jz_battery_probe(struct platform_device *pdev)
+{
+ int ret = 0;
+ struct jz_battery_platform_data *pdata = pdev->dev.parent->platform_data;
+ struct jz_battery *jz_battery;
+ struct power_supply *battery;
+
+ jz_battery = kzalloc(sizeof(*jz_battery), GFP_KERNEL);
+ if (!jz_battery) {
+ dev_err(&pdev->dev, "Failed to allocate driver structure\n");
+ return -ENOMEM;
+ }
+
+ jz_battery->cell = pdev->dev.platform_data;
+
+ jz_battery->irq = platform_get_irq(pdev, 0);
+ if (jz_battery->irq < 0) {
+ ret = jz_battery->irq;
+ dev_err(&pdev->dev, "Failed to get platform irq: %d\n", ret);
+ goto err_free;
+ }
+
+ jz_battery->mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!jz_battery->mem) {
+ ret = -ENOENT;
+ dev_err(&pdev->dev, "Failed to get platform mmio resource\n");
+ goto err_free;
+ }
+
+ jz_battery->mem = request_mem_region(jz_battery->mem->start,
+ resource_size(jz_battery->mem), pdev->name);
+ if (!jz_battery->mem) {
+ ret = -EBUSY;
+ dev_err(&pdev->dev, "Failed to request mmio memory region\n");
+ goto err_free;
+ }
+
+ jz_battery->base = ioremap_nocache(jz_battery->mem->start,
+ resource_size(jz_battery->mem));
+ if (!jz_battery->base) {
+ ret = -EBUSY;
+ dev_err(&pdev->dev, "Failed to ioremap mmio memory\n");
+ goto err_release_mem_region;
+ }
+
+ battery = &jz_battery->battery;
+ battery->name = pdata->info.name;
+ battery->type = POWER_SUPPLY_TYPE_BATTERY;
+ battery->properties = jz_battery_properties;
+ battery->num_properties = ARRAY_SIZE(jz_battery_properties);
+ battery->get_property = jz_battery_get_property;
+ battery->external_power_changed = jz_battery_external_power_changed;
+ battery->use_for_apm = 1;
+
+ jz_battery->pdata = pdata;
+ jz_battery->pdev = pdev;
+
+ init_completion(&jz_battery->read_completion);
+
+ 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);
+ goto err_iounmap;
+ }
+ 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);
+
+ ret = power_supply_register(&pdev->dev, &jz_battery->battery);
+ if (ret) {
+ dev_err(&pdev->dev, "power supply battery register failed.\n");
+ 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);
+err_iounmap:
+ platform_set_drvdata(pdev, NULL);
+ iounmap(jz_battery->base);
+err_release_mem_region:
+ release_mem_region(jz_battery->mem->start, resource_size(jz_battery->mem));
+err_free:
+ kfree(jz_battery);
+ return ret;
+}
+
+static int __devexit 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);
+
+ iounmap(jz_battery->base);
+ release_mem_region(jz_battery->mem->start, resource_size(jz_battery->mem));
+
+ 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 = __devexit_p(jz_battery_remove),
+ .driver = {
+ .name = "jz4740-battery",
+ .owner = THIS_MODULE,
+ .pm = JZ_BATTERY_PM_OPS,
+ },
+};
+
+static int __init jz_battery_init(void)
+{
+ return platform_driver_register(&jz_battery_driver);
+}
+module_init(jz_battery_init);
+
+static void __exit jz_battery_exit(void)
+{
+ platform_driver_unregister(&jz_battery_driver);
+}
+module_exit(jz_battery_exit);
+
+MODULE_ALIAS("platform:jz4740-battery");
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
+MODULE_DESCRIPTION("JZ4740 SoC battery driver");