Add power management devices.

1 files changed, 241 insertions, 0 deletions

diff --git a/arch/arm/mach-s3c2442/gta02-pm-gps.c b/arch/arm/mach-s3c2442/gta02-pm-gps.c
new file mode 100644
index 00000000000..02be4cec851
--- /dev/null
+++ b/arch/arm/mach-s3c2442/gta02-pm-gps.c
@@ -0,0 +1,241 @@
+/*
+ * GPS Power Management code for the Openmoko Freerunner GSM Phone
+ *
+ * (C) 2007-2009 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/delay.h>
+#include <linux/platform_device.h>
+
+#include <mach/hardware.h>
+#include <mach/gpio-fns.h>
+
+#include <asm/mach-types.h>
+
+#include <mach/gta02.h>
+#include <linux/mfd/pcf50633/core.h>
+#include <linux/mfd/pcf50633/pmic.h>
+
+#include <linux/regulator/consumer.h>
+#include <linux/err.h>
+
+struct gta02_pm_gps_data {
+#ifdef CONFIG_PM
+	int keep_on_in_suspend;
+#endif
+	int power_was_on;
+	struct regulator *regulator;
+};
+
+static struct gta02_pm_gps_data gta02_gps;
+
+int gta02_pm_gps_is_on(void)
+{
+	return gta02_gps.power_was_on;
+}
+EXPORT_SYMBOL_GPL(gta02_pm_gps_is_on);
+
+/* This is the POWERON pin */
+static void gps_pwron_set(int on)
+{
+	if (on) {
+		/* return UART pins to being UART pins */
+		s3c2410_gpio_cfgpin(S3C2410_GPH(4), S3C2410_GPH4_TXD1);
+		/* remove pulldown now it won't be floating any more */
+		s3c2410_gpio_pullup(S3C2410_GPH(5), 0);
+
+		if (!gta02_gps.power_was_on)
+			regulator_enable(gta02_gps.regulator);
+	} else {
+		/*
+		 * take care not to power unpowered GPS from UART TX
+		 * return them to GPIO and force low
+		 */
+		s3c2410_gpio_cfgpin(S3C2410_GPH(4), S3C2410_GPIO_OUTPUT);
+		s3c2410_gpio_setpin(S3C2410_GPH(4), 0);
+		/* don't let RX from unpowered GPS float */
+		s3c2410_gpio_pullup(S3C2410_GPH(5), 1);
+		if (gta02_gps.power_was_on)
+			regulator_disable(gta02_gps.regulator);
+	}
+}
+
+static int gps_pwron_get(void)
+{
+	return regulator_is_enabled(gta02_gps.regulator);
+}
+
+#ifdef CONFIG_PM
+/* This is the flag for keeping gps ON during suspend */
+static void gps_keep_on_in_suspend_set(int on)
+{
+	gta02_gps.keep_on_in_suspend = on;
+}
+
+static int gps_keep_on_in_suspend_get(void)
+{
+	return gta02_gps.keep_on_in_suspend;
+}
+#endif
+
+static ssize_t power_gps_read(struct device *dev,
+			      struct device_attribute *attr, char *buf)
+{
+	int ret = 0;
+
+	if (!strcmp(attr->attr.name, "power_on") ||
+	    !strcmp(attr->attr.name, "pwron")) {
+		ret = gps_pwron_get();
+#ifdef CONFIG_PM
+	} else if (!strcmp(attr->attr.name, "keep_on_in_suspend")) {
+		ret = gps_keep_on_in_suspend_get();
+#endif
+	}
+	if (ret)
+		return strlcpy(buf, "1\n", 3);
+	else
+		return strlcpy(buf, "0\n", 3);
+}
+
+static ssize_t power_gps_write(struct device *dev,
+			       struct device_attribute *attr, const char *buf,
+			       size_t count)
+{
+	unsigned long on = simple_strtoul(buf, NULL, 10);
+
+	if (!strcmp(attr->attr.name, "power_on") ||
+	    !strcmp(attr->attr.name, "pwron")) {
+		gps_pwron_set(on);
+		gta02_gps.power_was_on = !!on;
+#ifdef CONFIG_PM
+	} else if (!strcmp(attr->attr.name, "keep_on_in_suspend")) {
+		gps_keep_on_in_suspend_set(on);
+#endif
+	}
+	return count;
+}
+
+#ifdef CONFIG_PM
+static int gta02_pm_gps_suspend(struct platform_device *pdev,
+				pm_message_t state)
+{
+	if (!gta02_gps.keep_on_in_suspend ||
+		!gta02_gps.power_was_on)
+		gps_pwron_set(0);
+	else
+		dev_warn(&pdev->dev, "GTA02: keeping gps ON "
+			 "during suspend\n");
+	return 0;
+}
+
+static int gta02_pm_gps_resume(struct platform_device *pdev)
+{
+	if (!gta02_gps.keep_on_in_suspend && gta02_gps.power_was_on)
+		gps_pwron_set(1);
+
+	return 0;
+}
+
+static DEVICE_ATTR(keep_on_in_suspend, 0644, power_gps_read, power_gps_write);
+#else
+#define gta02_pm_gps_suspend	NULL
+#define gta02_pm_gps_resume	NULL
+#endif
+
+static DEVICE_ATTR(power_on, 0644, power_gps_read, power_gps_write);
+
+static struct attribute *gta02_gps_sysfs_entries[] = {
+	&dev_attr_power_on.attr,
+#ifdef CONFIG_PM
+	&dev_attr_keep_on_in_suspend.attr,
+#endif
+	NULL
+};
+
+static struct attribute_group gta02_gps_attr_group = {
+	.name	= NULL,
+	.attrs	= gta02_gps_sysfs_entries,
+};
+
+static int __init gta02_pm_gps_probe(struct platform_device *pdev)
+{
+	gta02_gps.regulator = regulator_get(&pdev->dev, "RF_3V");
+	if (IS_ERR(gta02_gps.regulator)) {
+		dev_err(&pdev->dev, "probe failed %ld\n",
+			PTR_ERR(gta02_gps.regulator));
+
+		return PTR_ERR(gta02_gps.regulator);
+	}
+
+	dev_info(&pdev->dev, "starting\n");
+
+	/*
+	 * Here we should call the code that handles the set GPS power
+	 * off action.  But, the regulator API does not allow us to
+	 * reassert regulator state, and when we read the regulator API
+	 * logical state, it can differ from the actual state,  So
+	 * a workaround for this is to just set the regulator off in the
+	 * PMU directly.  Because that's different from normal flow, we
+	 * have to reproduce other things from the OFF action here too.
+	 */
+
+	/*
+	 * u-boot enables LDO5 (GPS), which doesn't make sense and
+	 * causes confusion. We therefore disable the regulator here.
+	 */
+	pcf50633_reg_write(gta02_pcf, PCF50633_REG_LDO5ENA, 0);
+
+	/*
+	 * take care not to power unpowered GPS from UART TX
+	 * return them to GPIO and force low
+	 */
+	s3c2410_gpio_cfgpin(S3C2410_GPH(4), S3C2410_GPIO_OUTPUT);
+	s3c2410_gpio_setpin(S3C2410_GPH(4), 0);
+	/* don't let RX from unpowered GPS float */
+	s3c2410_gpio_pullup(S3C2410_GPH(5), 1);
+
+	return sysfs_create_group(&pdev->dev.kobj,
+				  &gta02_gps_attr_group);
+}
+
+static int gta02_pm_gps_remove(struct platform_device *pdev)
+{
+	regulator_put(gta02_gps.regulator);
+	sysfs_remove_group(&pdev->dev.kobj, &gta02_gps_attr_group);
+	return 0;
+}
+
+static struct platform_driver gta02_pm_gps_driver = {
+	.probe		= gta02_pm_gps_probe,
+	.remove		= gta02_pm_gps_remove,
+	.suspend	= gta02_pm_gps_suspend,
+	.resume		= gta02_pm_gps_resume,
+	.driver		= {
+		.name		= "gta02-pm-gps",
+	},
+};
+
+static int __devinit gta02_pm_gps_init(void)
+{
+	return platform_driver_register(&gta02_pm_gps_driver);
+}
+module_init(gta02_pm_gps_init);
+
+static void gta02_pm_gps_exit(void)
+{
+	platform_driver_unregister(&gta02_pm_gps_driver);
+}
+module_exit(gta02_pm_gps_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Harald Welte <laforge@openmoko.org>");