2 * Power supply driver for the goldfish emulator
4 * Copyright (C) 2008 Google, Inc.
5 * Copyright (C) 2012 Intel, Inc.
6 * Copyright (C) 2013 Intel, Inc.
7 * Author: Mike Lockwood <lockwood@android.com>
9 * This software is licensed under the terms of the GNU General Public
10 * License version 2, as published by the Free Software Foundation, and
11 * may be copied, distributed, and modified under those terms.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
19 #include <linux/module.h>
20 #include <linux/err.h>
21 #include <linux/platform_device.h>
22 #include <linux/power_supply.h>
23 #include <linux/types.h>
24 #include <linux/pci.h>
25 #include <linux/interrupt.h>
28 struct goldfish_battery_data {
29 void __iomem *reg_base;
33 struct power_supply *battery;
34 struct power_supply *ac;
37 #define GOLDFISH_BATTERY_READ(data, addr) \
38 (readl(data->reg_base + addr))
39 #define GOLDFISH_BATTERY_WRITE(data, addr, x) \
40 (writel(x, data->reg_base + addr))
43 * Temporary variable used between goldfish_battery_probe() and
44 * goldfish_battery_open().
46 static struct goldfish_battery_data *battery_data;
50 BATTERY_INT_STATUS = 0x00,
51 /* set this to enable IRQ */
52 BATTERY_INT_ENABLE = 0x04,
54 BATTERY_AC_ONLINE = 0x08,
55 BATTERY_STATUS = 0x0C,
56 BATTERY_HEALTH = 0x10,
57 BATTERY_PRESENT = 0x14,
58 BATTERY_CAPACITY = 0x18,
60 BATTERY_STATUS_CHANGED = 1U << 0,
61 AC_STATUS_CHANGED = 1U << 1,
62 BATTERY_INT_MASK = BATTERY_STATUS_CHANGED | AC_STATUS_CHANGED,
66 static int goldfish_ac_get_property(struct power_supply *psy,
67 enum power_supply_property psp,
68 union power_supply_propval *val)
70 struct goldfish_battery_data *data = power_supply_get_drvdata(psy);
74 case POWER_SUPPLY_PROP_ONLINE:
75 val->intval = GOLDFISH_BATTERY_READ(data, BATTERY_AC_ONLINE);
84 static int goldfish_battery_get_property(struct power_supply *psy,
85 enum power_supply_property psp,
86 union power_supply_propval *val)
88 struct goldfish_battery_data *data = power_supply_get_drvdata(psy);
92 case POWER_SUPPLY_PROP_STATUS:
93 val->intval = GOLDFISH_BATTERY_READ(data, BATTERY_STATUS);
95 case POWER_SUPPLY_PROP_HEALTH:
96 val->intval = GOLDFISH_BATTERY_READ(data, BATTERY_HEALTH);
98 case POWER_SUPPLY_PROP_PRESENT:
99 val->intval = GOLDFISH_BATTERY_READ(data, BATTERY_PRESENT);
101 case POWER_SUPPLY_PROP_TECHNOLOGY:
102 val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
104 case POWER_SUPPLY_PROP_CAPACITY:
105 val->intval = GOLDFISH_BATTERY_READ(data, BATTERY_CAPACITY);
115 static enum power_supply_property goldfish_battery_props[] = {
116 POWER_SUPPLY_PROP_STATUS,
117 POWER_SUPPLY_PROP_HEALTH,
118 POWER_SUPPLY_PROP_PRESENT,
119 POWER_SUPPLY_PROP_TECHNOLOGY,
120 POWER_SUPPLY_PROP_CAPACITY,
123 static enum power_supply_property goldfish_ac_props[] = {
124 POWER_SUPPLY_PROP_ONLINE,
127 static irqreturn_t goldfish_battery_interrupt(int irq, void *dev_id)
129 unsigned long irq_flags;
130 struct goldfish_battery_data *data = dev_id;
133 spin_lock_irqsave(&data->lock, irq_flags);
135 /* read status flags, which will clear the interrupt */
136 status = GOLDFISH_BATTERY_READ(data, BATTERY_INT_STATUS);
137 status &= BATTERY_INT_MASK;
139 if (status & BATTERY_STATUS_CHANGED)
140 power_supply_changed(data->battery);
141 if (status & AC_STATUS_CHANGED)
142 power_supply_changed(data->ac);
144 spin_unlock_irqrestore(&data->lock, irq_flags);
145 return status ? IRQ_HANDLED : IRQ_NONE;
148 static const struct power_supply_desc battery_desc = {
149 .properties = goldfish_battery_props,
150 .num_properties = ARRAY_SIZE(goldfish_battery_props),
151 .get_property = goldfish_battery_get_property,
153 .type = POWER_SUPPLY_TYPE_BATTERY,
156 static const struct power_supply_desc ac_desc = {
157 .properties = goldfish_ac_props,
158 .num_properties = ARRAY_SIZE(goldfish_ac_props),
159 .get_property = goldfish_ac_get_property,
161 .type = POWER_SUPPLY_TYPE_MAINS,
164 static int goldfish_battery_probe(struct platform_device *pdev)
168 struct goldfish_battery_data *data;
169 struct power_supply_config psy_cfg = {};
171 data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
175 spin_lock_init(&data->lock);
177 r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
179 dev_err(&pdev->dev, "platform_get_resource failed\n");
183 data->reg_base = devm_ioremap(&pdev->dev, r->start, resource_size(r));
184 if (data->reg_base == NULL) {
185 dev_err(&pdev->dev, "unable to remap MMIO\n");
189 data->irq = platform_get_irq(pdev, 0);
191 dev_err(&pdev->dev, "platform_get_irq failed\n");
195 ret = devm_request_irq(&pdev->dev, data->irq, goldfish_battery_interrupt,
196 IRQF_SHARED, pdev->name, data);
200 psy_cfg.drv_data = data;
202 data->ac = power_supply_register(&pdev->dev, &ac_desc, &psy_cfg);
203 if (IS_ERR(data->ac))
204 return PTR_ERR(data->ac);
206 data->battery = power_supply_register(&pdev->dev, &battery_desc,
208 if (IS_ERR(data->battery)) {
209 power_supply_unregister(data->ac);
210 return PTR_ERR(data->battery);
213 platform_set_drvdata(pdev, data);
216 GOLDFISH_BATTERY_WRITE(data, BATTERY_INT_ENABLE, BATTERY_INT_MASK);
220 static int goldfish_battery_remove(struct platform_device *pdev)
222 struct goldfish_battery_data *data = platform_get_drvdata(pdev);
224 power_supply_unregister(data->battery);
225 power_supply_unregister(data->ac);
230 static struct platform_driver goldfish_battery_device = {
231 .probe = goldfish_battery_probe,
232 .remove = goldfish_battery_remove,
234 .name = "goldfish-battery"
237 module_platform_driver(goldfish_battery_device);
239 MODULE_AUTHOR("Mike Lockwood lockwood@android.com");
240 MODULE_LICENSE("GPL");
241 MODULE_DESCRIPTION("Battery driver for the Goldfish emulator");