linux-kernel - [PATCH v2 1/1] mux: consumer: Add dummy functions for !CONFIG

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Message-Id: <83ff1554464c781df142117ed30430476ec73634.1499537263.git.sathyanarayanan.kuppuswamy@linux.intel.com>
Date:   Sat,  8 Jul 2017 11:12:05 -0700
From:   sathyanarayanan.kuppuswamy@...ux.intel.com
To:     peda@...ntia.se
Cc:     linux-kernel@...r.kernel.org, sathyaosid@...il.com,
        Kuppuswamy Sathyanarayanan 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>
Subject: [PATCH v2 1/1] mux: consumer: Add dummy functions for !CONFIG_MULTIPLEXER case

From: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@...ux.intel.com>

Add dummy functions to avoid compile time issues when CONFIG_MULTIPLEXER
is not enabled.

Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@...ux.intel.com>
---
 include/linux/mux/consumer.h | 38 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 38 insertions(+)

Changes since v1: 
 * Changed #ifdef to #if IS_ENABLED.

diff --git a/include/linux/mux/consumer.h b/include/linux/mux/consumer.h
index 5577e1b..df78988 100644
--- a/include/linux/mux/consumer.h
+++ b/include/linux/mux/consumer.h
@@ -16,6 +16,7 @@
 struct device;
 struct mux_control;
 
+#if IS_ENABLED(CONFIG_MULTIPLEXER)
 unsigned int mux_control_states(struct mux_control *mux);
 int __must_check mux_control_select(struct mux_control *mux,
 				    unsigned int state);
@@ -29,4 +30,41 @@ void mux_control_put(struct mux_control *mux);
 struct mux_control *devm_mux_control_get(struct device *dev,
 					 const char *mux_name);
 
+#else
+unsigned int mux_control_states(struct mux_control *mux)
+{
+	return -ENODEV;
+}
+
+int __must_check mux_control_select(struct mux_control *mux,
+				    unsigned int state)
+{
+	return -ENODEV;
+}
+
+int __must_check mux_control_try_select(struct mux_control *mux,
+					unsigned int state)
+{
+	return -ENODEV;
+}
+
+int mux_control_deselect(struct mux_control *mux)
+{
+	return -ENODEV;
+}
+
+struct mux_control *mux_control_get(struct device *dev, const char *mux_name)
+{
+	return ERR_PTR(-ENODEV);
+}
+
+void mux_control_put(struct mux_control *mux) {}
+
+struct mux_control *devm_mux_control_get(struct device *dev,
+					 const char *mux_name)
+{
+	return ERR_PTR(-ENODEV);
+}
+#endif
+
 #endif /* _LINUX_MUX_CONSUMER_H */
-- 
2.7.4