power/supply/goldfish_battery.c

0001 // SPDX-License-Identifier: GPL-2.0
0002 /*
0003  * Power supply driver for the goldfish emulator
0004  *
0005  * Copyright (C) 2008 Google, Inc.
0006  * Copyright (C) 2012 Intel, Inc.
0007  * Copyright (C) 2013 Intel, Inc.
0008  * Author: Mike Lockwood <lockwood@android.com>
0009  */
0010
0011 #include <linux/module.h>
0012 #include <linux/err.h>
0013 #include <linux/platform_device.h>
0014 #include <linux/power_supply.h>
0015 #include <linux/types.h>
0016 #include <linux/pci.h>
0017 #include <linux/interrupt.h>
0018 #include <linux/io.h>
0019 #include <linux/acpi.h>
0020
0021 struct goldfish_battery_data {
0022     void __iomem *reg_base;
0023     int irq;
0024     spinlock_t lock;
0025
0026     struct power_supply *battery;
0027     struct power_supply *ac;
0028 };
0029
0030 #define GOLDFISH_BATTERY_READ(data, addr) \
0031     (readl(data->reg_base + addr))
0032 #define GOLDFISH_BATTERY_WRITE(data, addr, x) \
0033     (writel(x, data->reg_base + addr))
0034
0035 enum {
0036     /* status register */
0037     BATTERY_INT_STATUS  = 0x00,
0038     /* set this to enable IRQ */
0039     BATTERY_INT_ENABLE  = 0x04,
0040
0041     BATTERY_AC_ONLINE   = 0x08,
0042     BATTERY_STATUS      = 0x0C,
0043     BATTERY_HEALTH      = 0x10,
0044     BATTERY_PRESENT     = 0x14,
0045     BATTERY_CAPACITY    = 0x18,
0046     BATTERY_VOLTAGE     = 0x1C,
0047     BATTERY_TEMP        = 0x20,
0048     BATTERY_CHARGE_COUNTER  = 0x24,
0049     BATTERY_VOLTAGE_MAX = 0x28,
0050     BATTERY_CURRENT_MAX = 0x2C,
0051     BATTERY_CURRENT_NOW = 0x30,
0052     BATTERY_CURRENT_AVG = 0x34,
0053     BATTERY_CHARGE_FULL_UAH = 0x38,
0054     BATTERY_CYCLE_COUNT = 0x40,
0055
0056     BATTERY_STATUS_CHANGED  = 1U << 0,
0057     AC_STATUS_CHANGED   = 1U << 1,
0058     BATTERY_INT_MASK    = BATTERY_STATUS_CHANGED | AC_STATUS_CHANGED,
0059 };
0060
0061
0062 static int goldfish_ac_get_property(struct power_supply *psy,
0063             enum power_supply_property psp,
0064             union power_supply_propval *val)
0065 {
0066     struct goldfish_battery_data *data = power_supply_get_drvdata(psy);
0067     int ret = 0;
0068
0069     switch (psp) {
0070     case POWER_SUPPLY_PROP_ONLINE:
0071         val->intval = GOLDFISH_BATTERY_READ(data, BATTERY_AC_ONLINE);
0072         break;
0073     case POWER_SUPPLY_PROP_VOLTAGE_MAX:
0074         val->intval = GOLDFISH_BATTERY_READ(data, BATTERY_VOLTAGE_MAX);
0075         break;
0076     case POWER_SUPPLY_PROP_CURRENT_MAX:
0077         val->intval = GOLDFISH_BATTERY_READ(data, BATTERY_CURRENT_MAX);
0078         break;
0079     default:
0080         ret = -EINVAL;
0081         break;
0082     }
0083     return ret;
0084 }
0085
0086 static int goldfish_battery_get_property(struct power_supply *psy,
0087                  enum power_supply_property psp,
0088                  union power_supply_propval *val)
0089 {
0090     struct goldfish_battery_data *data = power_supply_get_drvdata(psy);
0091     int ret = 0;
0092
0093     switch (psp) {
0094     case POWER_SUPPLY_PROP_STATUS:
0095         val->intval = GOLDFISH_BATTERY_READ(data, BATTERY_STATUS);
0096         break;
0097     case POWER_SUPPLY_PROP_HEALTH:
0098         val->intval = GOLDFISH_BATTERY_READ(data, BATTERY_HEALTH);
0099         break;
0100     case POWER_SUPPLY_PROP_PRESENT:
0101         val->intval = GOLDFISH_BATTERY_READ(data, BATTERY_PRESENT);
0102         break;
0103     case POWER_SUPPLY_PROP_TECHNOLOGY:
0104         val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
0105         break;
0106     case POWER_SUPPLY_PROP_CAPACITY:
0107         val->intval = GOLDFISH_BATTERY_READ(data, BATTERY_CAPACITY);
0108         break;
0109     case POWER_SUPPLY_PROP_VOLTAGE_NOW:
0110         val->intval = GOLDFISH_BATTERY_READ(data, BATTERY_VOLTAGE);
0111         break;
0112     case POWER_SUPPLY_PROP_TEMP:
0113         val->intval = GOLDFISH_BATTERY_READ(data, BATTERY_TEMP);
0114         break;
0115     case POWER_SUPPLY_PROP_CHARGE_COUNTER:
0116         val->intval = GOLDFISH_BATTERY_READ(data,
0117                             BATTERY_CHARGE_COUNTER);
0118         break;
0119     case POWER_SUPPLY_PROP_CURRENT_NOW:
0120         val->intval = GOLDFISH_BATTERY_READ(data, BATTERY_CURRENT_NOW);
0121         break;
0122     case POWER_SUPPLY_PROP_CURRENT_AVG:
0123         val->intval = GOLDFISH_BATTERY_READ(data, BATTERY_CURRENT_AVG);
0124         break;
0125     case POWER_SUPPLY_PROP_CHARGE_FULL:
0126         val->intval = GOLDFISH_BATTERY_READ(data,
0127                             BATTERY_CHARGE_FULL_UAH);
0128         break;
0129     case POWER_SUPPLY_PROP_CYCLE_COUNT:
0130         val->intval = GOLDFISH_BATTERY_READ(data, BATTERY_CYCLE_COUNT);
0131         break;
0132     default:
0133         ret = -EINVAL;
0134         break;
0135     }
0136
0137     return ret;
0138 }
0139
0140 static enum power_supply_property goldfish_battery_props[] = {
0141     POWER_SUPPLY_PROP_STATUS,
0142     POWER_SUPPLY_PROP_HEALTH,
0143     POWER_SUPPLY_PROP_PRESENT,
0144     POWER_SUPPLY_PROP_TECHNOLOGY,
0145     POWER_SUPPLY_PROP_CAPACITY,
0146     POWER_SUPPLY_PROP_VOLTAGE_NOW,
0147     POWER_SUPPLY_PROP_TEMP,
0148     POWER_SUPPLY_PROP_CHARGE_COUNTER,
0149     POWER_SUPPLY_PROP_CURRENT_NOW,
0150     POWER_SUPPLY_PROP_CURRENT_AVG,
0151     POWER_SUPPLY_PROP_CHARGE_FULL,
0152     POWER_SUPPLY_PROP_CYCLE_COUNT,
0153 };
0154
0155 static enum power_supply_property goldfish_ac_props[] = {
0156     POWER_SUPPLY_PROP_ONLINE,
0157     POWER_SUPPLY_PROP_VOLTAGE_MAX,
0158     POWER_SUPPLY_PROP_CURRENT_MAX,
0159 };
0160
0161 static irqreturn_t goldfish_battery_interrupt(int irq, void *dev_id)
0162 {
0163     unsigned long irq_flags;
0164     struct goldfish_battery_data *data = dev_id;
0165     uint32_t status;
0166
0167     spin_lock_irqsave(&data->lock, irq_flags);
0168
0169     /* read status flags, which will clear the interrupt */
0170     status = GOLDFISH_BATTERY_READ(data, BATTERY_INT_STATUS);
0171     status &= BATTERY_INT_MASK;
0172
0173     if (status & BATTERY_STATUS_CHANGED)
0174         power_supply_changed(data->battery);
0175     if (status & AC_STATUS_CHANGED)
0176         power_supply_changed(data->ac);
0177
0178     spin_unlock_irqrestore(&data->lock, irq_flags);
0179     return status ? IRQ_HANDLED : IRQ_NONE;
0180 }
0181
0182 static const struct power_supply_desc battery_desc = {
0183     .properties = goldfish_battery_props,
0184     .num_properties = ARRAY_SIZE(goldfish_battery_props),
0185     .get_property   = goldfish_battery_get_property,
0186     .name       = "battery",
0187     .type       = POWER_SUPPLY_TYPE_BATTERY,
0188 };
0189
0190 static const struct power_supply_desc ac_desc = {
0191     .properties = goldfish_ac_props,
0192     .num_properties = ARRAY_SIZE(goldfish_ac_props),
0193     .get_property   = goldfish_ac_get_property,
0194     .name       = "ac",
0195     .type       = POWER_SUPPLY_TYPE_MAINS,
0196 };
0197
0198 static int goldfish_battery_probe(struct platform_device *pdev)
0199 {
0200     int ret;
0201     struct resource *r;
0202     struct goldfish_battery_data *data;
0203     struct power_supply_config psy_cfg = {};
0204
0205     data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
0206     if (data == NULL)
0207         return -ENOMEM;
0208
0209     spin_lock_init(&data->lock);
0210
0211     r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
0212     if (r == NULL) {
0213         dev_err(&pdev->dev, "platform_get_resource failed\n");
0214         return -ENODEV;
0215     }
0216
0217     data->reg_base = devm_ioremap(&pdev->dev, r->start, resource_size(r));
0218     if (data->reg_base == NULL) {
0219         dev_err(&pdev->dev, "unable to remap MMIO\n");
0220         return -ENOMEM;
0221     }
0222
0223     data->irq = platform_get_irq(pdev, 0);
0224     if (data->irq < 0)
0225         return -ENODEV;
0226
0227     ret = devm_request_irq(&pdev->dev, data->irq,
0228                    goldfish_battery_interrupt,
0229                    IRQF_SHARED, pdev->name, data);
0230     if (ret)
0231         return ret;
0232
0233     psy_cfg.drv_data = data;
0234
0235     data->ac = power_supply_register(&pdev->dev, &ac_desc, &psy_cfg);
0236     if (IS_ERR(data->ac))
0237         return PTR_ERR(data->ac);
0238
0239     data->battery = power_supply_register(&pdev->dev, &battery_desc,
0240                         &psy_cfg);
0241     if (IS_ERR(data->battery)) {
0242         power_supply_unregister(data->ac);
0243         return PTR_ERR(data->battery);
0244     }
0245
0246     platform_set_drvdata(pdev, data);
0247
0248     GOLDFISH_BATTERY_WRITE(data, BATTERY_INT_ENABLE, BATTERY_INT_MASK);
0249     return 0;
0250 }
0251
0252 static int goldfish_battery_remove(struct platform_device *pdev)
0253 {
0254     struct goldfish_battery_data *data = platform_get_drvdata(pdev);
0255
0256     power_supply_unregister(data->battery);
0257     power_supply_unregister(data->ac);
0258     return 0;
0259 }
0260
0261 static const struct of_device_id goldfish_battery_of_match[] = {
0262     { .compatible = "google,goldfish-battery", },
0263     {},
0264 };
0265 MODULE_DEVICE_TABLE(of, goldfish_battery_of_match);
0266
0267 #ifdef CONFIG_ACPI
0268 static const struct acpi_device_id goldfish_battery_acpi_match[] = {
0269     { "GFSH0001", 0 },
0270     { },
0271 };
0272 MODULE_DEVICE_TABLE(acpi, goldfish_battery_acpi_match);
0273 #endif
0274
0275 static struct platform_driver goldfish_battery_device = {
0276     .probe      = goldfish_battery_probe,
0277     .remove     = goldfish_battery_remove,
0278     .driver = {
0279         .name = "goldfish-battery",
0280         .of_match_table = goldfish_battery_of_match,
0281         .acpi_match_table = ACPI_PTR(goldfish_battery_acpi_match),
0282     }
0283 };
0284 module_platform_driver(goldfish_battery_device);
0285
0286 MODULE_AUTHOR("Mike Lockwood lockwood@android.com");
0287 MODULE_LICENSE("GPL");
0288 MODULE_DESCRIPTION("Battery driver for the Goldfish emulator");