From: 黄涛 <huangtao@rock-chips.com>
Date: Tue, 7 Dec 2010 10:44:26 +0000 (+0800)
Subject: adc: 当CONFIG_ADC未配置，依赖于adc的代码依然可以编译
X-Git-Tag: firefly_0821_release~10981^2~2
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=60cfb8b2919603be05827d13fab5e8988b251f6c;p=firefly-linux-kernel-4.4.55.git

adc: 当CONFIG_ADC未配置，依赖于adc的代码依然可以编译
---

diff --git a/include/linux/adc.h b/include/linux/adc.h
index 47df46e5862f..fcef9923f78b 100755
--- a/include/linux/adc.h
+++ b/include/linux/adc.h
@@ -61,6 +61,7 @@ extern void adc_free_host(struct adc_host *adc);
 extern void adc_core_irq_handle(struct adc_host *adc);
 
 
+#ifdef CONFIG_ADC
 extern struct adc_client *adc_register(int chn,
 				void (*callback)(struct adc_client *, void *, int), 
 				void *callback_param);
@@ -68,6 +69,17 @@ extern void adc_unregister(struct adc_client *client);
 
 extern int adc_sync_read(struct adc_client *client);
 extern int adc_async_read(struct adc_client *client);
+#else
+static inline struct adc_client *adc_register(int chn,
+				void (*callback)(struct adc_client *, void *, int),
+				void *callback_param)
+{
+	return NULL;
+}
+static inline void adc_unregister(struct adc_client *client) {}
+static inline int adc_sync_read(struct adc_client *client) { return -EINVAL; }
+static inline int adc_async_read(struct adc_client *client) { return -EINVAL; }
+#endif
 
 #endif