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From 2dac0b9383e3939ce69b07aff70e8eae3b7fa561 Mon Sep 17 00:00:00 2001
From: Jiri Pinkava <jiri.pinkava@vscht.cz>
Date: Wed, 26 May 2010 23:00:56 +0200
Subject: [PATCH 13/14] n35: Acer n35 GPS power management
Signed-off-by: Jiri Pinkava <jiri.pinkava@vscht.cz>
---
arch/arm/mach-s3c2410/Makefile | 1 +
arch/arm/mach-s3c2410/mach-n30.c | 6 ++
arch/arm/mach-s3c2410/n35_gps.c | 148 ++++++++++++++++++++++++++++++++++++++
3 files changed, 155 insertions(+), 0 deletions(-)
create mode 100644 arch/arm/mach-s3c2410/n35_gps.c
diff --git a/arch/arm/mach-s3c2410/Makefile b/arch/arm/mach-s3c2410/Makefile
index 0d468e9..896baa4 100644
--- a/arch/arm/mach-s3c2410/Makefile
+++ b/arch/arm/mach-s3c2410/Makefile
@@ -25,6 +25,7 @@ obj-$(CONFIG_ARCH_H1940) += mach-h1940.o
obj-$(CONFIG_H1940BT) += h1940-bluetooth.o
obj-$(CONFIG_PM_H1940) += pm-h1940.o
obj-$(CONFIG_MACH_N30) += mach-n30.o
+obj-$(CONFIG_MACH_N35) += n35_gps.o
obj-$(CONFIG_ARCH_BAST) += mach-bast.o usb-simtec.o
obj-$(CONFIG_MACH_OTOM) += mach-otom.o
obj-$(CONFIG_MACH_AML_M5900) += mach-amlm5900.o
diff --git a/arch/arm/mach-s3c2410/mach-n30.c b/arch/arm/mach-s3c2410/mach-n30.c
index 34a7e9e..010d5aa 100644
--- a/arch/arm/mach-s3c2410/mach-n30.c
+++ b/arch/arm/mach-s3c2410/mach-n30.c
@@ -631,6 +631,11 @@ static struct s3c24xx_mci_pdata n30_mci_cfg __initdata = {
.set_power = n30_sdi_set_power,
};
+static struct platform_device n35_device_gps = {
+ .name = "n35-gps",
+ .id = -1,
+};
+
static struct platform_device *n30_devices[] __initdata = {
&s3c_device_lcd,
&s3c_device_wdt,
@@ -664,6 +669,7 @@ static struct platform_device *n35_devices[] __initdata = {
&s3c_device_ts,
&s3c_device_timer[0],
&n35_backlight,
+ &n35_device_gps,
&n35_lcd_powerdev,
&n30_battery,
&n35_button_device,
diff --git a/arch/arm/mach-s3c2410/n35_gps.c b/arch/arm/mach-s3c2410/n35_gps.c
new file mode 100644
index 0000000..41506e9
--- /dev/null
+++ b/arch/arm/mach-s3c2410/n35_gps.c
@@ -0,0 +1,148 @@
+/*
+ * arch/arm/mach-s3c2410/n35-gps.c
+ * Copyright (c) Arnaud Patard <arnaud.patard@rtp-net.org>
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file COPYING in the main directory of this archive for
+ * more details.
+ *
+ * Acer n35 GPS "driver"
+ * FIXME: Do proper up/down handling, now it only ses power on/off.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/platform_device.h>
+//#include <linux/delay.h>
+#include <linux/string.h>
+#include <linux/ctype.h>
+#include <linux/gpio.h>
+
+#include <mach/regs-gpio.h>
+#include <mach/hardware.h>
+
+#define DRV_NAME "n35-gps"
+
+struct n35_gps_data {
+ int suspend_power_state;
+};
+
+static struct n35_gps_data n35_gps;
+
+static int gps_power_get(void)
+{
+ return !(gpio_get_value(S3C2410_GPB(4)) || \
+ gpio_get_value(S3C2410_GPG(11)));
+}
+
+static void gps_power_set(int power)
+{
+ gpio_set_value(S3C2410_GPB(4), power ? 0 : 1);
+ gpio_set_value(S3C2410_GPG(11), power ? 0 : 1);
+}
+
+static ssize_t gps_power_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ if (gps_power_get())
+ return sprintf(buf, "1\n");
+ return sprintf(buf, "0\n");
+}
+
+static ssize_t gps_power_store(struct device *pdev,
+ struct device_attribute *attr, const char *buf, size_t size)
+{
+ int power;
+
+ power = simple_strtoul(buf, NULL, 0);
+ gps_power_set(power);
+
+ return size;
+}
+
+static DEVICE_ATTR(gps_power, 0664, gps_power_show, gps_power_store);
+
+static int __devinit n35_gps_probe(struct platform_device *pdev)
+{
+ int ret;
+
+ ret = gpio_request(S3C2410_GPB(4), "Acer n35 GPS module power");
+ if (ret)
+ goto ret_err;
+
+ ret = gpio_request(S3C2410_GPG(11), "Acer n35 GPS antena power");
+ if (ret)
+ goto ret_err_gpg4;
+
+ s3c_gpio_cfgpin(S3C2410_GPB(4), S3C2410_GPIO_OUTPUT);
+ s3c_gpio_cfgpin(S3C2410_GPG(11), S3C2410_GPIO_OUTPUT);
+
+ gps_power_set(0);
+
+ ret = device_create_file(&pdev->dev, &dev_attr_gps_power);
+ if (ret) {
+ dev_err(&pdev->dev, "Failed to create GPS sysfs device\n");
+ goto ret_err_gpg11;
+ }
+
+ return 0;
+ret_err_gpg11:
+ gpio_free(S3C2410_GPG(11));
+ret_err_gpg4:
+ gpio_free(S3C2410_GPB(4));
+ret_err:
+ return ret;
+}
+
+static int n35_gps_remove(struct platform_device *pdev)
+{
+ gps_power_set(0);
+
+ gpio_free(S3C2410_GPG(11));
+ gpio_free(S3C2410_GPB(4));
+
+ device_remove_file(&pdev->dev, &dev_attr_gps_power);
+
+ return 0;
+}
+
+static int n35_gps_suspend(struct platform_device *pdev, pm_message_t state)
+{
+ n35_gps.suspend_power_state = gps_power_get();
+ gps_power_set(0);
+ return 0;
+}
+
+static int n35_gps_resume(struct platform_device *pdev)
+{
+ gps_power_set(n35_gps.suspend_power_state);
+ return 0;
+}
+
+static struct platform_driver n35_gps_driver = {
+ .driver = {
+ .name = DRV_NAME,
+ },
+ .probe = n35_gps_probe,
+ .remove = n35_gps_remove,
+ .resume = n35_gps_resume,
+ .suspend = n35_gps_suspend,
+};
+
+
+static int __init n35_gps_init(void)
+{
+ return platform_driver_register(&n35_gps_driver);
+}
+
+static void __exit n35_gps_exit(void)
+{
+ platform_driver_unregister(&n35_gps_driver);
+}
+
+module_init(n35_gps_init);
+module_exit(n35_gps_exit);
+
+MODULE_AUTHOR("Jiri Pinkava <jiri.pinkava@vscht.cz>");
+MODULE_DESCRIPTION("Driver for the Acer n35 GPS");
+MODULE_LICENSE("GPL");
--
1.7.3.1
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