i2c-designware: Add runtime power management support

[pandora-kernel.git] / drivers / i2c / busses / i2c-designware-core.c

diff --git a/drivers/i2c/busses/i2c-designware-core.c b/drivers/i2c/busses/i2c-designware-core.c
index b9f18dd..df87992 100644 (file)
--- a/drivers/i2c/busses/i2c-designware-core.c
+++ b/drivers/i2c/busses/i2c-designware-core.c
@@ -31,6 +31,7 @@
 #include <linux/i2c.h>
 #include <linux/interrupt.h>
 #include <linux/io.h>
+#include <linux/pm_runtime.h>
 #include <linux/delay.h>
 #include "i2c-designware-core.h"
 
@@ -501,6 +502,7 @@ i2c_dw_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num)
        dev_dbg(dev->dev, "%s: msgs: %d\n", __func__, num);
 
        mutex_lock(&dev->lock);
+       pm_runtime_get_sync(dev->dev);
 
        INIT_COMPLETION(dev->cmd_complete);
        dev->msgs = msgs;
@@ -550,6 +552,7 @@ i2c_dw_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num)
        ret = -EIO;
 
 done:
+       pm_runtime_put(dev->dev);
        mutex_unlock(&dev->lock);
 
        return ret;
@@ -671,10 +674,13 @@ void i2c_dw_enable(struct dw_i2c_dev *dev)
        dw_writel(dev, 1, DW_IC_ENABLE);
 }
 
-void i2c_dw_disable(struct dw_i2c_dev *dev)
+u32 i2c_dw_is_enabled(struct dw_i2c_dev *dev)
 {
-       int ret;
+       return dw_readl(dev, DW_IC_ENABLE);
+}
 
+void i2c_dw_disable(struct dw_i2c_dev *dev)
+{
        /* Disable controller */
        dw_writel(dev, 0, DW_IC_ENABLE);