i2c: core: Add function for finding the bus speed from ACPI, take 2

[cascardo/linux.git] / include / linux / i2c.h

diff --git a/include/linux/i2c.h b/include/linux/i2c.h
index fffdc27..5b4a3cb 100644 (file)
--- a/include/linux/i2c.h
+++ b/include/linux/i2c.h
@@ -600,6 +600,20 @@ i2c_lock_bus(struct i2c_adapter *adapter, unsigned int flags)
        adapter->lock_bus(adapter, flags);
 }
 
+/**
+ * i2c_trylock_bus - Try to get exclusive access to an I2C bus segment
+ * @adapter: Target I2C bus segment
+ * @flags: I2C_LOCK_ROOT_ADAPTER tries to locks the root i2c adapter,
+ *     I2C_LOCK_SEGMENT tries to lock only this branch in the adapter tree
+ *
+ * Return: true if the I2C bus segment is locked, false otherwise
+ */
+static inline int
+i2c_trylock_bus(struct i2c_adapter *adapter, unsigned int flags)
+{
+       return adapter->trylock_bus(adapter, flags);
+}
+
 /**
  * i2c_unlock_bus - Release exclusive access to an I2C bus segment
  * @adapter: Target I2C bus segment
@@ -766,4 +780,13 @@ static inline struct i2c_adapter *of_get_i2c_adapter_by_node(struct device_node
 }
 #endif /* CONFIG_OF */
 
+#if IS_ENABLED(CONFIG_ACPI)
+u32 i2c_acpi_find_bus_speed(struct device *dev);
+#else
+static inline u32 i2c_acpi_find_bus_speed(struct device *dev)
+{
+       return 0;
+}
+#endif /* CONFIG_ACPI */
+
 #endif /* _LINUX_I2C_H */