introduce-gta02-pm-wlan.patch

Signed-off-by: Andy Green <andy@openmoko.com>

1 files changed, 142 insertions, 0 deletions

diff --git a/arch/arm/plat-s3c24xx/gta02_pm_wlan.c b/arch/arm/plat-s3c24xx/gta02_pm_wlan.c
new file mode 100644
index 00000000000..954015e4c71
--- /dev/null
+++ b/arch/arm/plat-s3c24xx/gta02_pm_wlan.c
@@ -0,0 +1,142 @@
+/*
+ * GTA02 WLAN power management
+ *
+ * (C) 2008 by Openmoko Inc.
+ * Author: Andy Green <andy@openmoko.com>
+ * 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 <asm/mach-types.h>
+#include <asm/plat-s3c24xx/neo1973.h>
+
+#include <mach/gta02.h>
+#include <mach/regs-gpio.h>
+#include <mach/regs-gpioj.h>
+
+#include <linux/delay.h>
+
+static ssize_t gta02_wlan_read(struct device *dev,
+				       struct device_attribute *attr, char *buf)
+{
+	if (s3c2410_gpio_getpin(GTA02_CHIP_PWD))
+		return strlcpy(buf, "0\n", 3);
+
+	return strlcpy(buf, "1\n", 3);
+}
+
+static ssize_t gta02_wlan_write(struct device *dev,
+		   struct device_attribute *attr, const char *buf, size_t count)
+{
+	unsigned long on = simple_strtoul(buf, NULL, 10) & 1;
+
+	if (!on) {
+		s3c2410_gpio_setpin(GTA02_CHIP_PWD, 1);
+		s3c2410_gpio_setpin(GTA02_GPIO_nWLAN_RESET, 0);
+
+		return count;
+	}
+
+	/* power up sequencing */
+
+	s3c2410_gpio_setpin(GTA02_CHIP_PWD, 1);
+	s3c2410_gpio_setpin(GTA02_GPIO_nWLAN_RESET, 0);
+	msleep(100);
+	s3c2410_gpio_setpin(GTA02_CHIP_PWD, 0);
+	msleep(100);
+	s3c2410_gpio_setpin(GTA02_GPIO_nWLAN_RESET, 1);
+
+	return count;
+}
+
+static DEVICE_ATTR(power_on, 0644, gta02_wlan_read, gta02_wlan_write);
+
+#ifdef CONFIG_PM
+static int gta02_wlan_suspend(struct platform_device *pdev, pm_message_t state)
+{
+	dev_dbg(&pdev->dev, "suspending\n");
+
+	return 0;
+}
+
+static int gta02_wlan_resume(struct platform_device *pdev)
+{
+	dev_dbg(&pdev->dev, "resuming\n");
+
+	return 0;
+}
+#else
+#define gta02_wlan_suspend	NULL
+#define gta02_wlan_resume		NULL
+#endif
+
+static struct attribute *gta02_wlan_sysfs_entries[] = {
+	&dev_attr_power_on.attr,
+	NULL
+};
+
+static struct attribute_group gta02_wlan_attr_group = {
+	.name	= NULL,
+	.attrs	= gta02_wlan_sysfs_entries,
+};
+
+static int __init gta02_wlan_probe(struct platform_device *pdev)
+{
+	if (!machine_is_neo1973_gta02())
+		return -EINVAL;
+
+	dev_info(&pdev->dev, "starting\n");
+
+	/* Power is down */
+	s3c2410_gpio_setpin(GTA02_CHIP_PWD, 1);
+	s3c2410_gpio_cfgpin(GTA02_CHIP_PWD, S3C2410_GPIO_OUTPUT);
+	/* reset is asserted */
+	s3c2410_gpio_setpin(GTA02_GPIO_nWLAN_RESET, 0);
+	s3c2410_gpio_cfgpin(GTA02_GPIO_nWLAN_RESET, S3C2410_GPIO_OUTPUT);
+
+	return sysfs_create_group(&pdev->dev.kobj, &gta02_wlan_attr_group);
+}
+
+static int gta02_wlan_remove(struct platform_device *pdev)
+{
+	sysfs_remove_group(&pdev->dev.kobj, &gta02_wlan_attr_group);
+
+	return 0;
+}
+
+static struct platform_driver gta02_wlan_driver = {
+	.probe		= gta02_wlan_probe,
+	.remove		= gta02_wlan_remove,
+	.suspend	= gta02_wlan_suspend,
+	.resume		= gta02_wlan_resume,
+	.driver		= {
+		.name		= "gta02-pm-wlan",
+	},
+};
+
+static int __devinit gta02_wlan_init(void)
+{
+	return platform_driver_register(&gta02_wlan_driver);
+}
+
+static void gta02_wlan_exit(void)
+{
+	platform_driver_unregister(&gta02_wlan_driver);
+}
+
+module_init(gta02_wlan_init);
+module_exit(gta02_wlan_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Andy Green <andy@openmoko.com>");
+MODULE_DESCRIPTION("Openmoko GTA02 WLAN power management");