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authorLars-Peter Clausen <lars@metafoo.de>2009-10-04 20:54:02 +0200
committerLars-Peter Clausen <lars@metafoo.de>2009-12-06 09:54:07 +0100
commitaa20bf0814698e26ec6a850a5c215446a7087d22 (patch)
tree6e81a3449969051af98b7b0396f23860af453808 /arch/arm/mach-s3c2442/gta02-pm-gps.c
parent4924a969d8dde0e15e67dcc1fb6e2b7df6cb90f5 (diff)
Add power management devices.
Diffstat (limited to 'arch/arm/mach-s3c2442/gta02-pm-gps.c')
-rw-r--r--arch/arm/mach-s3c2442/gta02-pm-gps.c241
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>");