linux-kernel - [PATCH 2/3] provide a dummy implementation of the clk API

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Date:	Tue, 22 Apr 2008 11:52:56 +0200
From:	Uwe Kleine-König <Uwe.Kleine-Koenig@...i.com>
To:	"Hans J. Koch" <hjk@...utronix.de>,
	Greg Kroah-Hartman <gregkh@...e.de>
CC:	<linux-kernel@...r.kernel.org>
Subject: [PATCH 2/3] provide a dummy implementation of the clk API

With this implementation clk_get and clk_enable always succeed.  The
counterparts clk_put and clk_disable only do some minor error checking.

Signed-off-by: Uwe Kleine-König <Uwe.Kleine-Koenig@...i.com>
---
 lib/Kconfig    |    6 ++++++
 lib/Makefile   |    2 ++
 lib/dummyclk.c |   54 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 62 insertions(+), 0 deletions(-)
 create mode 100644 lib/dummyclk.c

Hello,

this patch isn't really UIO related, but as my platform driver uses the
clk API and that's not implemented on X86 here comes a dummy
implementation.

This patch was already sent but up to now I got no feedback for it.

Best regards
Uwe

diff --git a/lib/Kconfig b/lib/Kconfig
index 2d53dc0..098830d 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -144,4 +144,10 @@ config CHECK_SIGNATURE
 config HAVE_LMB
 	boolean
 
+config DUMMY_CLK
+	def_bool y if X86
+	help
+	  This provides a dummy implementation for the API defined in
+	  linux/clk.h for platforms that don't implement it theirselves.
+
 endmenu
diff --git a/lib/Makefile b/lib/Makefile
index bf8000f..e355c69 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -70,6 +70,8 @@ lib-$(CONFIG_GENERIC_BUG) += bug.o
 
 obj-$(CONFIG_HAVE_LMB) += lmb.o
 
+obj-$(CONFIG_DUMMY_CLK) += dummyclk.o
+
 hostprogs-y	:= gen_crc32table
 clean-files	:= crc32table.h
 
diff --git a/lib/dummyclk.c b/lib/dummyclk.c
new file mode 100644
index 0000000..bf364df
--- /dev/null
+++ b/lib/dummyclk.c
@@ -0,0 +1,54 @@
+/*
+ * lib/dummyclk.c
+ *
+ * Copyright (C) 2008 by Digi International Inc.
+ * 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/device.h>
+#include <linux/err.h>
+
+struct clk {
+	unsigned int enablecnt;
+};
+
+struct clk *clk_get(struct device *dev, const char *id)
+{
+	struct clk *ret = kzalloc(sizeof(*ret), GFP_KERNEL);
+
+	if (ret)
+		return ret;
+	else
+		return ERR_PTR(-ENOMEM);
+}
+EXPORT_SYMBOL(clk_get);
+
+void clk_put(struct clk *clk)
+{
+	WARN_ON(clk->enablecnt);
+}
+EXPORT_SYMBOL(clk_put);
+
+int clk_enable(struct clk *clk)
+{
+	++clk->enablecnt;
+	return 0;
+}
+EXPORT_SYMBOL(clk_enable);
+
+void clk_disable(struct clk *clk)
+{
+	BUG_ON(!clk->enablecnt);
+	--clk->enablecnt;
+}
+EXPORT_SYMBOL(clk_disable);
+
+unsigned long clk_get_rate(struct clk *clk)
+{
+	BUG_ON(!clk->enablecnt);
+	return 0;
+}
+EXPORT_SYMBOL(clk_get_rate);
-- 
1.5.5

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