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Subject[PATCH RESEND] goldfish: power device
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Date
From: Mike Lockwood <lockwood@android.com>

Add the emulated power driver for the Goldfish platform.

This folds together the code from the Google tree, Jun Nakajima's cleanups
and x86 porting work, and then a tidy up to pass checkpatch.

Signed-off-by: Mike A. Chan <mikechan@google.com>
[cleanup and x86 support]
Signed-off-by: Sheng Yang <sheng@linux.intel.com>
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
Signed-off-by: Xiaohui Xin <xiaohui.xin@intel.com>
Signed-off-by: Jun Nakajima <jun.nakajima@intel.com>
Signed-off-by: Bruce Beare <bruce.j.beare@intel.com>
[ported to 3.4]
Signed-off-by: Tom Keel <thomas.keel@intel.com>
[ported to 3.7 and final tidy]
Signed-off-by: Alan Cox <alan@linux.intel.com>
---

drivers/power/Kconfig | 8 +
drivers/power/Makefile | 1
drivers/power/goldfish_battery.c | 234 ++++++++++++++++++++++++++++++++++++++
3 files changed, 242 insertions(+), 1 deletion(-)
create mode 100644 drivers/power/goldfish_battery.c


diff --git a/drivers/power/Kconfig b/drivers/power/Kconfig
index 9f45e2f..0c5208d 100644
--- a/drivers/power/Kconfig
+++ b/drivers/power/Kconfig
@@ -346,8 +346,14 @@ config AB8500_BM
help
Say Y to include support for AB8500 battery management.

-source "drivers/power/reset/Kconfig"
+config BATTERY_GOLDFISH
+ tristate "Goldfish battery driver"
+ depends on GOLDFISH
+ help
+ Say Y to enable support for the battery and AC power in the
+ Goldfish emulator.

+source "drivers/power/reset/Kconfig"
endif # POWER_SUPPLY

source "drivers/power/avs/Kconfig"
diff --git a/drivers/power/Makefile b/drivers/power/Makefile
index b11e0c7..a9f5c06 100644
--- a/drivers/power/Makefile
+++ b/drivers/power/Makefile
@@ -20,6 +20,7 @@ obj-$(CONFIG_BATTERY_DS2760) += ds2760_battery.o
obj-$(CONFIG_BATTERY_DS2780) += ds2780_battery.o
obj-$(CONFIG_BATTERY_DS2781) += ds2781_battery.o
obj-$(CONFIG_BATTERY_DS2782) += ds2782_battery.o
+obj-$(CONFIG_BATTERY_GOLDFISH) += goldfish_battery.o
obj-$(CONFIG_BATTERY_PMU) += pmu_battery.o
obj-$(CONFIG_BATTERY_OLPC) += olpc_battery.o
obj-$(CONFIG_BATTERY_TOSA) += tosa_battery.o
diff --git a/drivers/power/goldfish_battery.c b/drivers/power/goldfish_battery.c
new file mode 100644
index 0000000..e067ab0
--- /dev/null
+++ b/drivers/power/goldfish_battery.c
@@ -0,0 +1,234 @@
+/*
+ * 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>
+
+
+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 = container_of(psy,
+ struct goldfish_battery_data, ac);
+ 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 = container_of(psy,
+ struct goldfish_battery_data, battery);
+ 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 int goldfish_battery_probe(struct platform_device *pdev)
+{
+ int ret;
+ struct resource *r;
+ struct goldfish_battery_data *data;
+
+ data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
+ if (data == NULL)
+ return -ENOMEM;
+
+ spin_lock_init(&data->lock);
+
+ data->battery.properties = goldfish_battery_props;
+ data->battery.num_properties = ARRAY_SIZE(goldfish_battery_props);
+ data->battery.get_property = goldfish_battery_get_property;
+ data->battery.name = "battery";
+ data->battery.type = POWER_SUPPLY_TYPE_BATTERY;
+
+ data->ac.properties = goldfish_ac_props;
+ data->ac.num_properties = ARRAY_SIZE(goldfish_ac_props);
+ data->ac.get_property = goldfish_ac_get_property;
+ data->ac.name = "ac";
+ data->ac.type = POWER_SUPPLY_TYPE_MAINS;
+
+ 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, r->end - r->start + 1);
+ 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;
+
+ ret = power_supply_register(&pdev->dev, &data->ac);
+ if (ret)
+ return ret;
+
+ ret = power_supply_register(&pdev->dev, &data->battery);
+ if (ret) {
+ power_supply_unregister(&data->ac);
+ return ret;
+ }
+
+ 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 struct platform_driver goldfish_battery_device = {
+ .probe = goldfish_battery_probe,
+ .remove = goldfish_battery_remove,
+ .driver = {
+ .name = "goldfish-battery"
+ }
+};
+
+module_platform_driver(goldfish_battery_device);
+
+MODULE_AUTHOR("Mike Lockwood lockwood@android.com");
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Battery driver for the Goldfish emulator");


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