Quelle  goldfish_battery.c   Sprache: C

// 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 = devm_power_supply_register(&pdev->dev,
           &ac_desc,
           &psy_cfg);
 if (IS_ERR(data->ac))
  return PTR_ERR(data->ac);

 data->battery = devm_power_supply_register(&pdev->dev,
         &battery_desc,
         &psy_cfg);
 if (IS_ERR(data->battery))
  return PTR_ERR(data->battery);

 GOLDFISH_BATTERY_WRITE(data, BATTERY_INT_ENABLE, BATTERY_INT_MASK);
 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,
 .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");