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authorMichael Lawnick <ml.lawnick@gmx.de>2010-08-11 18:21:02 +0200
committerJean Delvare <khali@linux-fr.org>2010-08-11 18:21:02 +0200
commit0826374bff57411d239f2fcb15da3c35af0a93cd (patch)
tree514d4361cfc9cc546306612de3464def7fe8a7cd /include/linux/i2c.h
parentdafc50d141c27959dbd3a1cfe9857a86d23402a7 (diff)
downloadop-kernel-dev-0826374bff57411d239f2fcb15da3c35af0a93cd.zip
op-kernel-dev-0826374bff57411d239f2fcb15da3c35af0a93cd.tar.gz
i2c: Multiplexed I2C bus core support
Add multiplexed bus core support. I2C multiplexer and switches like pca954x get instantiated as new adapters per port. Signed-off-by: Michael Lawnick <ml.lawnick@gmx.de> Acked-by: Rodolfo Giometti <giometti@linux.it> Signed-off-by: Jean Delvare <khali@linux-fr.org>
Diffstat (limited to 'include/linux/i2c.h')
-rw-r--r--include/linux/i2c.h8
1 files changed, 8 insertions, 0 deletions
diff --git a/include/linux/i2c.h b/include/linux/i2c.h
index 798bad8..4bae0b7 100644
--- a/include/linux/i2c.h
+++ b/include/linux/i2c.h
@@ -37,6 +37,7 @@
#include <linux/of.h> /* for struct device_node */
extern struct bus_type i2c_bus_type;
+extern struct device_type i2c_adapter_type;
/* --- General options ------------------------------------------------ */
@@ -383,6 +384,13 @@ static inline void i2c_set_adapdata(struct i2c_adapter *dev, void *data)
dev_set_drvdata(&dev->dev, data);
}
+static inline int i2c_parent_is_i2c_adapter(const struct i2c_adapter *adapter)
+{
+ return adapter->dev.parent != NULL
+ && adapter->dev.parent->bus == &i2c_bus_type
+ && adapter->dev.parent->type == &i2c_adapter_type;
+}
+
/* Adapter locking functions, exported for shared pin cases */
void i2c_lock_adapter(struct i2c_adapter *);
void i2c_unlock_adapter(struct i2c_adapter *);
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