summaryrefslogtreecommitdiffstats
path: root/drivers/power/supply/goldfish_battery.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/power/supply/goldfish_battery.c')
-rw-r--r--drivers/power/supply/goldfish_battery.c288
1 files changed, 288 insertions, 0 deletions
diff --git a/drivers/power/supply/goldfish_battery.c b/drivers/power/supply/goldfish_battery.c
new file mode 100644
index 000000000..a58d713d7
--- /dev/null
+++ b/drivers/power/supply/goldfish_battery.c
@@ -0,0 +1,288 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Power supply driver for the goldfish emulator
+ *
+ * Copyright (C) 2008 Google, Inc.
+ * Copyright (C) 2012 Intel, Inc.
+ * Copyright (C) 2013 Intel, Inc.
+ * Author: Mike Lockwood <lockwood@android.com>
+ */
+
+#include <linux/module.h>
+#include <linux/err.h>
+#include <linux/platform_device.h>
+#include <linux/power_supply.h>
+#include <linux/types.h>
+#include <linux/pci.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/acpi.h>
+
+struct goldfish_battery_data {
+ void __iomem *reg_base;
+ int irq;
+ spinlock_t lock;
+
+ struct power_supply *battery;
+ struct power_supply *ac;
+};
+
+#define GOLDFISH_BATTERY_READ(data, addr) \
+ (readl(data->reg_base + addr))
+#define GOLDFISH_BATTERY_WRITE(data, addr, x) \
+ (writel(x, data->reg_base + addr))
+
+enum {
+ /* status register */
+ BATTERY_INT_STATUS = 0x00,
+ /* set this to enable IRQ */
+ BATTERY_INT_ENABLE = 0x04,
+
+ BATTERY_AC_ONLINE = 0x08,
+ BATTERY_STATUS = 0x0C,
+ BATTERY_HEALTH = 0x10,
+ BATTERY_PRESENT = 0x14,
+ BATTERY_CAPACITY = 0x18,
+ BATTERY_VOLTAGE = 0x1C,
+ BATTERY_TEMP = 0x20,
+ BATTERY_CHARGE_COUNTER = 0x24,
+ BATTERY_VOLTAGE_MAX = 0x28,
+ BATTERY_CURRENT_MAX = 0x2C,
+ BATTERY_CURRENT_NOW = 0x30,
+ BATTERY_CURRENT_AVG = 0x34,
+ BATTERY_CHARGE_FULL_UAH = 0x38,
+ BATTERY_CYCLE_COUNT = 0x40,
+
+ BATTERY_STATUS_CHANGED = 1U << 0,
+ AC_STATUS_CHANGED = 1U << 1,
+ BATTERY_INT_MASK = BATTERY_STATUS_CHANGED | AC_STATUS_CHANGED,
+};
+
+
+static int goldfish_ac_get_property(struct power_supply *psy,
+ enum power_supply_property psp,
+ union power_supply_propval *val)
+{
+ struct goldfish_battery_data *data = power_supply_get_drvdata(psy);
+ int ret = 0;
+
+ switch (psp) {
+ case POWER_SUPPLY_PROP_ONLINE:
+ val->intval = GOLDFISH_BATTERY_READ(data, BATTERY_AC_ONLINE);
+ break;
+ case POWER_SUPPLY_PROP_VOLTAGE_MAX:
+ val->intval = GOLDFISH_BATTERY_READ(data, BATTERY_VOLTAGE_MAX);
+ break;
+ case POWER_SUPPLY_PROP_CURRENT_MAX:
+ val->intval = GOLDFISH_BATTERY_READ(data, BATTERY_CURRENT_MAX);
+ break;
+ default:
+ ret = -EINVAL;
+ break;
+ }
+ return ret;
+}
+
+static int goldfish_battery_get_property(struct power_supply *psy,
+ enum power_supply_property psp,
+ union power_supply_propval *val)
+{
+ struct goldfish_battery_data *data = power_supply_get_drvdata(psy);
+ int ret = 0;
+
+ switch (psp) {
+ case POWER_SUPPLY_PROP_STATUS:
+ val->intval = GOLDFISH_BATTERY_READ(data, BATTERY_STATUS);
+ break;
+ case POWER_SUPPLY_PROP_HEALTH:
+ val->intval = GOLDFISH_BATTERY_READ(data, BATTERY_HEALTH);
+ break;
+ case POWER_SUPPLY_PROP_PRESENT:
+ val->intval = GOLDFISH_BATTERY_READ(data, BATTERY_PRESENT);
+ break;
+ case POWER_SUPPLY_PROP_TECHNOLOGY:
+ val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
+ break;
+ case POWER_SUPPLY_PROP_CAPACITY:
+ val->intval = GOLDFISH_BATTERY_READ(data, BATTERY_CAPACITY);
+ break;
+ case POWER_SUPPLY_PROP_VOLTAGE_NOW:
+ val->intval = GOLDFISH_BATTERY_READ(data, BATTERY_VOLTAGE);
+ break;
+ case POWER_SUPPLY_PROP_TEMP:
+ val->intval = GOLDFISH_BATTERY_READ(data, BATTERY_TEMP);
+ break;
+ case POWER_SUPPLY_PROP_CHARGE_COUNTER:
+ val->intval = GOLDFISH_BATTERY_READ(data,
+ BATTERY_CHARGE_COUNTER);
+ break;
+ case POWER_SUPPLY_PROP_CURRENT_NOW:
+ val->intval = GOLDFISH_BATTERY_READ(data, BATTERY_CURRENT_NOW);
+ break;
+ case POWER_SUPPLY_PROP_CURRENT_AVG:
+ val->intval = GOLDFISH_BATTERY_READ(data, BATTERY_CURRENT_AVG);
+ break;
+ case POWER_SUPPLY_PROP_CHARGE_FULL:
+ val->intval = GOLDFISH_BATTERY_READ(data,
+ BATTERY_CHARGE_FULL_UAH);
+ break;
+ case POWER_SUPPLY_PROP_CYCLE_COUNT:
+ val->intval = GOLDFISH_BATTERY_READ(data, BATTERY_CYCLE_COUNT);
+ break;
+ default:
+ ret = -EINVAL;
+ break;
+ }
+
+ return ret;
+}
+
+static enum power_supply_property goldfish_battery_props[] = {
+ POWER_SUPPLY_PROP_STATUS,
+ POWER_SUPPLY_PROP_HEALTH,
+ POWER_SUPPLY_PROP_PRESENT,
+ POWER_SUPPLY_PROP_TECHNOLOGY,
+ POWER_SUPPLY_PROP_CAPACITY,
+ POWER_SUPPLY_PROP_VOLTAGE_NOW,
+ POWER_SUPPLY_PROP_TEMP,
+ POWER_SUPPLY_PROP_CHARGE_COUNTER,
+ POWER_SUPPLY_PROP_CURRENT_NOW,
+ POWER_SUPPLY_PROP_CURRENT_AVG,
+ POWER_SUPPLY_PROP_CHARGE_FULL,
+ POWER_SUPPLY_PROP_CYCLE_COUNT,
+};
+
+static enum power_supply_property goldfish_ac_props[] = {
+ POWER_SUPPLY_PROP_ONLINE,
+ POWER_SUPPLY_PROP_VOLTAGE_MAX,
+ POWER_SUPPLY_PROP_CURRENT_MAX,
+};
+
+static irqreturn_t goldfish_battery_interrupt(int irq, void *dev_id)
+{
+ unsigned long irq_flags;
+ struct goldfish_battery_data *data = dev_id;
+ uint32_t status;
+
+ spin_lock_irqsave(&data->lock, irq_flags);
+
+ /* read status flags, which will clear the interrupt */
+ status = GOLDFISH_BATTERY_READ(data, BATTERY_INT_STATUS);
+ status &= BATTERY_INT_MASK;
+
+ if (status & BATTERY_STATUS_CHANGED)
+ power_supply_changed(data->battery);
+ if (status & AC_STATUS_CHANGED)
+ power_supply_changed(data->ac);
+
+ spin_unlock_irqrestore(&data->lock, irq_flags);
+ return status ? IRQ_HANDLED : IRQ_NONE;
+}
+
+static const struct power_supply_desc battery_desc = {
+ .properties = goldfish_battery_props,
+ .num_properties = ARRAY_SIZE(goldfish_battery_props),
+ .get_property = goldfish_battery_get_property,
+ .name = "battery",
+ .type = POWER_SUPPLY_TYPE_BATTERY,
+};
+
+static const struct power_supply_desc ac_desc = {
+ .properties = goldfish_ac_props,
+ .num_properties = ARRAY_SIZE(goldfish_ac_props),
+ .get_property = goldfish_ac_get_property,
+ .name = "ac",
+ .type = POWER_SUPPLY_TYPE_MAINS,
+};
+
+static int goldfish_battery_probe(struct platform_device *pdev)
+{
+ int ret;
+ struct resource *r;
+ struct goldfish_battery_data *data;
+ struct power_supply_config psy_cfg = {};
+
+ data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
+ if (data == NULL)
+ return -ENOMEM;
+
+ spin_lock_init(&data->lock);
+
+ r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (r == NULL) {
+ dev_err(&pdev->dev, "platform_get_resource failed\n");
+ return -ENODEV;
+ }
+
+ data->reg_base = devm_ioremap(&pdev->dev, r->start, resource_size(r));
+ if (data->reg_base == NULL) {
+ dev_err(&pdev->dev, "unable to remap MMIO\n");
+ return -ENOMEM;
+ }
+
+ data->irq = platform_get_irq(pdev, 0);
+ if (data->irq < 0)
+ return -ENODEV;
+
+ ret = devm_request_irq(&pdev->dev, data->irq,
+ goldfish_battery_interrupt,
+ IRQF_SHARED, pdev->name, data);
+ if (ret)
+ return ret;
+
+ psy_cfg.drv_data = data;
+
+ data->ac = power_supply_register(&pdev->dev, &ac_desc, &psy_cfg);
+ if (IS_ERR(data->ac))
+ return PTR_ERR(data->ac);
+
+ data->battery = power_supply_register(&pdev->dev, &battery_desc,
+ &psy_cfg);
+ if (IS_ERR(data->battery)) {
+ power_supply_unregister(data->ac);
+ return PTR_ERR(data->battery);
+ }
+
+ platform_set_drvdata(pdev, data);
+
+ GOLDFISH_BATTERY_WRITE(data, BATTERY_INT_ENABLE, BATTERY_INT_MASK);
+ return 0;
+}
+
+static int goldfish_battery_remove(struct platform_device *pdev)
+{
+ struct goldfish_battery_data *data = platform_get_drvdata(pdev);
+
+ power_supply_unregister(data->battery);
+ power_supply_unregister(data->ac);
+ return 0;
+}
+
+static const struct of_device_id goldfish_battery_of_match[] = {
+ { .compatible = "google,goldfish-battery", },
+ {},
+};
+MODULE_DEVICE_TABLE(of, goldfish_battery_of_match);
+
+#ifdef CONFIG_ACPI
+static const struct acpi_device_id goldfish_battery_acpi_match[] = {
+ { "GFSH0001", 0 },
+ { },
+};
+MODULE_DEVICE_TABLE(acpi, goldfish_battery_acpi_match);
+#endif
+
+static struct platform_driver goldfish_battery_device = {
+ .probe = goldfish_battery_probe,
+ .remove = goldfish_battery_remove,
+ .driver = {
+ .name = "goldfish-battery",
+ .of_match_table = goldfish_battery_of_match,
+ .acpi_match_table = ACPI_PTR(goldfish_battery_acpi_match),
+ }
+};
+module_platform_driver(goldfish_battery_device);
+
+MODULE_AUTHOR("Mike Lockwood lockwood@android.com");
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Battery driver for the Goldfish emulator");