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From foo@baz Thu Dec 27 10:01:09 PST 2012
Date: Thu, 27 Dec 2012 10:01:09 -0800
To: Greg KH <gregkh@linuxfoundation.org>
From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Subject: dbus: in the kernel
Something to play around with, don't take this seriously, yet...
---
drivers/char/Kconfig | 3 ++
drivers/char/Makefile | 1
drivers/char/dbus.c | 57 ++++++++++++++++++++++++++++++++++++++++++++++++++
include/linux/dbus.h | 15 +++++++++++++
4 files changed, 76 insertions(+)
--- a/drivers/char/Kconfig
+++ b/drivers/char/Kconfig
@@ -604,5 +604,8 @@ config TILE_SROM
device appear much like a simple EEPROM, and knows
how to partition a single ROM for multiple purposes.
+config DBUS
+ tristate "Kernel DBUS provider"
+
endmenu
--- a/drivers/char/Makefile
+++ b/drivers/char/Makefile
@@ -62,3 +62,4 @@ obj-$(CONFIG_JS_RTC) += js-rtc.o
js-rtc-y = rtc.o
obj-$(CONFIG_TILE_SROM) += tile-srom.o
+obj-$(CONFIG_DBUS) += dbus.o
--- /dev/null
+++ b/drivers/char/dbus.c
@@ -0,0 +1,57 @@
+/*
+ * dbus - in kernel dbus functionality
+ *
+ * Copyright (C) 2012 Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+ * Copyright (C) 2012 Linux Foundation
+ *
+ * This file is released under the GPLv2 only.
+ */
+
+#include <linux/types.h>
+#include <linux/mutex.h>
+#include <linux/idr.h>
+#include <linux/module.h>
+#include <linux/dbus.h>
+
+static DEFINE_MUTEX(minor_lock);
+static DEFINE_IDR(minor_idr);
+
+static int minor_get(void)
+{
+ int minor = -ENOMEM;
+ int retval;
+
+ mutex_lock(&minor_lock);
+ if (idr_pre_get(&minor_idr, GFP_KERNEL) == 0)
+ goto exit;
+ retval = idr_get_new(&minor_idr, NULL, &minor);
+ if (retval < 0) {
+ minor = retval;
+ if (retval == -EAGAIN)
+ minor = -ENOMEM;
+ }
+exit:
+ mutex_unlock(&minor_lock);
+ return minor;
+}
+
+static void minor_free(int minor)
+{
+ mutex_lock(&minor_lock);
+ idr_remove(&minor_idr, minor);
+ mutex_unlock(&minor_lock);
+}
+
+static int dbus_init(void)
+{
+ return 0;
+}
+
+static void dbus_exit(void)
+{
+}
+
+module_init(dbus_init);
+module_exit(dbus_exit);
+
+MODULE_LICENSE("GPLv2");
--- /dev/null
+++ b/include/linux/dbus.h
@@ -0,0 +1,15 @@
+/*
+ * dbus.h - user/kernel dbus api
+ *
+ * Copyright (C) 2012 Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+ * Copyright (C) 2012 Linux Foundation
+ *
+ * Released under the GPLv2 only.
+ */
+
+#ifndef __DBUS_H
+#define __DBUS_H
+
+
+
+#endif /* __DBUS_H */
|
