/* * 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> * * This software is licensed under the terms of the GNU General Public * License version 2, as published by the Free Software Foundation, and * may be copied, distributed, and modified under those terms. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. */ #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)) /* * Temporary variable used between goldfish_battery_probe() and * goldfish_battery_open(). */ static struct goldfish_battery_data *battery_data; 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_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; 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; 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, }; static enum power_supply_property goldfish_ac_props[] = { POWER_SUPPLY_PROP_ONLINE, }; 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) { dev_err(&pdev->dev, "platform_get_irq failed\n"); 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); battery_data = 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); battery_data = NULL; return 0; } static const struct of_device_id goldfish_battery_of_match[] = { { .compatible = "google,goldfish-battery", }, {}, }; MODULE_DEVICE_TABLE(of, goldfish_battery_of_match); static const struct acpi_device_id goldfish_battery_acpi_match[] = { { "GFSH0001", 0 }, { }, }; MODULE_DEVICE_TABLE(acpi, goldfish_battery_acpi_match); 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");