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authorLars-Peter Clausen <lars@metafoo.de>2010-05-17 20:22:47 +0200
committerLars-Peter Clausen <lars@metafoo.de>2010-05-17 21:21:59 +0200
commita139463010e22ed1af2e64a1229ad0a9c0ee628c (patch)
treed13956254bab774a9a633a9d52253a9fbc0fb6ac /arch/arm
parentcaae218ff71120df2a724cca20c357a4658f41fa (diff)
gta02: Add gps power management device
Diffstat (limited to 'arch/arm')
-rw-r--r--arch/arm/mach-s3c2440/Makefile1
-rw-r--r--arch/arm/mach-s3c2440/gta02-pm-gps.c222
-rw-r--r--arch/arm/mach-s3c2440/include/mach/gta02-pm-gps.h1
-rw-r--r--arch/arm/mach-s3c2440/mach-gta02.c16
4 files changed, 240 insertions, 0 deletions
diff --git a/arch/arm/mach-s3c2440/Makefile b/arch/arm/mach-s3c2440/Makefile
index dc4665a6d18..050950fdee6 100644
--- a/arch/arm/mach-s3c2440/Makefile
+++ b/arch/arm/mach-s3c2440/Makefile
@@ -35,6 +35,7 @@ obj-$(CONFIG_MACH_AT2440EVB) += mach-at2440evb.o
obj-$(CONFIG_MACH_MINI2440) += mach-mini2440.o
obj-$(CONFIG_MACH_NEO1973_GTA02) += mach-gta02.o \
gta02-pm-bt.o \
+ gta02-pm-gps.o \
# extra machine support
diff --git a/arch/arm/mach-s3c2440/gta02-pm-gps.c b/arch/arm/mach-s3c2440/gta02-pm-gps.c
new file mode 100644
index 00000000000..9721f9a76e0
--- /dev/null
+++ b/arch/arm/mach-s3c2440/gta02-pm-gps.c
@@ -0,0 +1,222 @@
+/*
+ * 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/platform_device.h>
+
+#include <mach/hardware.h>
+#include <mach/gpio-fns.h>
+
+#include <mach/gta02.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"))
+ 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")) {
+ 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 device *dev)
+{
+ if (!gta02_gps.keep_on_in_suspend ||
+ !gta02_gps.power_was_on)
+ gps_pwron_set(0);
+ else
+ dev_warn(dev, "GTA02: keeping gps ON "
+ "during suspend\n");
+ return 0;
+}
+
+static int gta02_pm_gps_resume(struct device *dev)
+{
+ 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);
+
+static struct dev_pm_ops gta02_gps_pm_ops = {
+ .suspend = gta02_pm_gps_suspend,
+ .resume = gta02_pm_gps_resume,
+};
+
+#define GTA02_GPS_PM_OPS (&gta02_gps_pm_ops)
+
+#else
+#define GTA02_GPS_PM_OPS 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");
+
+ /*
+ * 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,
+ .driver = {
+ .name = "gta02-pm-gps",
+ .pm = GTA02_GPS_PM_OPS,
+ },
+};
+
+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>");
diff --git a/arch/arm/mach-s3c2440/include/mach/gta02-pm-gps.h b/arch/arm/mach-s3c2440/include/mach/gta02-pm-gps.h
new file mode 100644
index 00000000000..f15180ac079
--- /dev/null
+++ b/arch/arm/mach-s3c2440/include/mach/gta02-pm-gps.h
@@ -0,0 +1 @@
+extern int gta02_pm_gps_is_on(void);
diff --git a/arch/arm/mach-s3c2440/mach-gta02.c b/arch/arm/mach-s3c2440/mach-gta02.c
index 8eae7d8599e..c256da5dcf0 100644
--- a/arch/arm/mach-s3c2440/mach-gta02.c
+++ b/arch/arm/mach-s3c2440/mach-gta02.c
@@ -94,6 +94,8 @@
#include <plat/gpio-core.h>
#include <plat/iic.h>
+#include <mach/gta02-pm-gps.h>
+
static struct pcf50633 *gta02_pcf;
/*
@@ -160,6 +162,10 @@ static struct platform_device gta02_pm_bt_dev = {
.name = "gta02-pm-bt",
};
+static struct platform_device gta02_pm_gps_dev = {
+ .name = "gta02-pm-gps",
+};
+
#ifdef CONFIG_CHARGER_PCF50633
/*
* On GTA02 the 1A charger features a 48K resistor to 0V on the ID pin.
@@ -272,6 +278,13 @@ static struct regulator_consumer_supply ldo4_consumers[] = {
},
};
+static struct regulator_consumer_supply ldo5_consumers[] = {
+ {
+ .dev = &gta02_pm_gps_dev.dev,
+ .supply = "RF_3V",
+ },
+};
+
struct pcf50633_platform_data gta02_pcf_pdata = {
.resumers = {
[0] = PCF50633_INT1_USBINS |
@@ -384,6 +397,8 @@ struct pcf50633_platform_data gta02_pcf_pdata = {
.enabled = 1,
},
},
+ .num_consumer_supplies = ARRAY_SIZE(ldo5_consumers),
+ .consumer_supplies = ldo5_consumers,
},
[PCF50633_REGULATOR_LDO6] = {
.constraints = {
@@ -729,6 +744,7 @@ static struct platform_device *gta02_devices[] __initdata = {
&gta02_buttons_device,
&gta02_leds_device,
&gta02_pwm_leds_device,
+ &gta02_pm_gps_dev,
&gta02_pm_bt_dev,
};