Add power management devices.

1 files changed, 257 insertions, 0 deletions

diff --git a/arch/arm/mach-s3c2442/gta02-pm-bt.c b/arch/arm/mach-s3c2442/gta02-pm-bt.c
new file mode 100644
index 00000000000..76671ce96d0
--- /dev/null
+++ b/arch/arm/mach-s3c2442/gta02-pm-bt.c
@@ -0,0 +1,257 @@
+/*
+ * Bluetooth PM code for the Openmoko Freerunner GSM Phone
+ *
+ * (C) 2007 by Openmoko Inc.
+ * Author: Harald Welte <laforge@openmoko.org>
+ * All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/platform_device.h>
+#include <linux/rfkill.h>
+#include <linux/err.h>
+#include <mach/gpio-fns.h>
+
+#include <mach/hardware.h>
+#include <asm/mach-types.h>
+
+#include <mach/gta02.h>
+#include <linux/mfd/pcf50633/gpio.h>
+
+#include <linux/regulator/consumer.h>
+
+#define DRVMSG "Openmoko Freerunner Bluetooth Power Management"
+
+struct gta02_pm_bt_data {
+	struct regulator *regulator;
+	struct rfkill *rfkill;
+	int pre_resume_state;
+};
+
+static ssize_t bt_read(struct device *dev, struct device_attribute *attr,
+		       char *buf)
+{
+	int ret = 0;
+	if (!strcmp(attr->attr.name, "power_on")) {
+		if (s3c2410_gpio_getpin(GTA02_GPIO_BT_EN))
+			ret = 1;
+	} else if (!strcmp(attr->attr.name, "reset")) {
+		if (s3c2410_gpio_getpin(GTA02_GPIO_BT_EN) == 0)
+			ret = 1;
+	}
+
+	if (!ret) {
+		return strlcpy(buf, "0\n", 3);
+	} else {
+		return strlcpy(buf, "1\n", 3);
+	}
+}
+
+static void __gta02_pm_bt_toggle_radio(struct device *dev, unsigned int on)
+{
+	struct gta02_pm_bt_data *bt_data = dev_get_drvdata(dev);
+
+	dev_info(dev, "__gta02_pm_bt_toggle_radio %d\n", on);
+
+	bt_data = dev_get_drvdata(dev);
+
+	s3c2410_gpio_setpin(GTA02_GPIO_BT_EN, !on);
+
+	if (on) {
+		if (!regulator_is_enabled(bt_data->regulator))
+			regulator_enable(bt_data->regulator);
+	} else {
+		if (regulator_is_enabled(bt_data->regulator))
+			regulator_disable(bt_data->regulator);
+	}
+
+	s3c2410_gpio_setpin(GTA02_GPIO_BT_EN, on);
+}
+
+
+static int bt_rfkill_set_block(void *data, bool blocked)
+{
+	struct device *dev = data;
+
+	__gta02_pm_bt_toggle_radio(dev, !blocked);
+
+	return 0;
+}
+
+static const struct rfkill_ops gta02_bt_rfkill_ops = {
+       .set_block = bt_rfkill_set_block,
+};
+
+
+static ssize_t bt_write(struct device *dev, struct device_attribute *attr,
+			const char *buf, size_t count)
+{
+	unsigned long on = simple_strtoul(buf, NULL, 10);
+	struct gta02_pm_bt_data *bt_data = dev_get_drvdata(dev);
+
+	if (!strcmp(attr->attr.name, "power_on")) {
+		rfkill_set_sw_state(bt_data->rfkill, on ? 1 : 0);
+
+		__gta02_pm_bt_toggle_radio(dev, on);
+	} else if (!strcmp(attr->attr.name, "reset")) {
+		/* reset is low-active, so we need to invert */
+		s3c2410_gpio_setpin(GTA02_GPIO_BT_EN, on ? 0 : 1);
+	}
+
+	return count;
+}
+
+static DEVICE_ATTR(power_on, 0644, bt_read, bt_write);
+static DEVICE_ATTR(reset, 0644, bt_read, bt_write);
+
+#ifdef CONFIG_PM
+static int gta02_bt_suspend(struct platform_device *pdev, pm_message_t state)
+{
+	struct gta02_pm_bt_data *bt_data = dev_get_drvdata(&pdev->dev);
+
+	dev_dbg(&pdev->dev, DRVMSG ": suspending\n");
+
+	bt_data->pre_resume_state = s3c2410_gpio_getpin(GTA02_GPIO_BT_EN);
+	__gta02_pm_bt_toggle_radio(&pdev->dev, 0);
+
+	return 0;
+}
+
+static int gta02_bt_resume(struct platform_device *pdev)
+{
+	struct gta02_pm_bt_data *bt_data = dev_get_drvdata(&pdev->dev);
+	dev_dbg(&pdev->dev, DRVMSG ": resuming\n");
+
+	__gta02_pm_bt_toggle_radio(&pdev->dev, bt_data->pre_resume_state);
+	return 0;
+}
+#else
+#define gta02_bt_suspend	NULL
+#define gta02_bt_resume		NULL
+#endif
+
+static struct attribute *gta02_bt_sysfs_entries[] = {
+	&dev_attr_power_on.attr,
+	&dev_attr_reset.attr,
+	NULL
+};
+
+static struct attribute_group gta02_bt_attr_group = {
+	.name	= NULL,
+	.attrs	= gta02_bt_sysfs_entries,
+};
+
+static int __init gta02_bt_probe(struct platform_device *pdev)
+{
+	struct rfkill *rfkill;
+	struct regulator *regulator;
+	struct gta02_pm_bt_data *bt_data;
+	int ret;
+
+	dev_info(&pdev->dev, DRVMSG ": starting\n");
+
+	bt_data = kzalloc(sizeof(*bt_data), GFP_KERNEL);
+	dev_set_drvdata(&pdev->dev, bt_data);
+
+	regulator = regulator_get(&pdev->dev, "BT_3V2");
+	if (IS_ERR(regulator))
+		return -ENODEV;
+
+	bt_data->regulator = regulator;
+
+	/* this tests the true physical state of the regulator... */
+	if (regulator_is_enabled(regulator)) {
+		/*
+		 * but these only operate on the logical state of the
+		 * regulator... so we need to logicaly "adopt" it on
+		 * to turn it off
+		 */
+		regulator_enable(regulator);
+		regulator_disable(regulator);
+	}
+
+	/* we pull reset to low to make sure that the chip doesn't
+	 * drain power through the reset line */
+	s3c2410_gpio_setpin(GTA02_GPIO_BT_EN, 0);
+
+	rfkill = rfkill_alloc(pdev->name, &pdev->dev, RFKILL_TYPE_BLUETOOTH,
+                            &gta02_bt_rfkill_ops, &pdev->dev);
+
+	if (!rfkill) {
+		dev_err(&pdev->dev, "Failed to allocate rfkill\n");
+		return -ENOMEM;
+	}
+
+    rfkill_init_sw_state(rfkill, 0);
+
+	ret = rfkill_register(rfkill);
+	if (ret) {
+		rfkill_destroy(rfkill);
+		dev_err(&pdev->dev, "Failed to register rfkill\n");
+		return ret;
+	}
+
+	bt_data->rfkill = rfkill;
+
+	return sysfs_create_group(&pdev->dev.kobj, &gta02_bt_attr_group);
+}
+
+static int gta02_bt_remove(struct platform_device *pdev)
+{
+	struct gta02_pm_bt_data *bt_data = dev_get_drvdata(&pdev->dev);
+	struct regulator *regulator;
+
+	sysfs_remove_group(&pdev->dev.kobj, &gta02_bt_attr_group);
+
+	if (bt_data->rfkill) {
+		rfkill_destroy(bt_data->rfkill);
+	}
+
+	if (!bt_data || !bt_data->regulator)
+		return 0;
+
+	regulator = bt_data->regulator;
+
+	/* Make sure regulator is disabled before calling regulator_put */
+	if (regulator_is_enabled(regulator))
+		regulator_disable(regulator);
+
+	regulator_put(regulator);
+
+	kfree(bt_data);
+
+	return 0;
+}
+
+static struct platform_driver gta02_bt_driver = {
+	.probe		= gta02_bt_probe,
+	.remove		= gta02_bt_remove,
+	.suspend	= gta02_bt_suspend,
+	.resume		= gta02_bt_resume,
+	.driver		= {
+		.name		= "gta02-pm-bt",
+	},
+};
+
+static int __devinit gta02_bt_init(void)
+{
+	return platform_driver_register(&gta02_bt_driver);
+}
+module_init(gta02_bt_init);
+
+static void gta02_bt_exit(void)
+{
+	platform_driver_unregister(&gta02_bt_driver);
+}
+module_exit(gta02_bt_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Harald Welte <laforge@openmoko.org>");
+MODULE_DESCRIPTION(DRVMSG);