[PATCH] i2c: sh_mobile: Don't start transfers when suspending

[Bastian Hecht <hechtb@gmail.com>]

Currently we provoke i2c timeouts by allowing transfers when
suspending. This patch adds awareness to suspending and fixes these
issues.
The patch follows the style used in i2c-tegra.c - thanks.

Signed-off-by: Bastian Hecht <hechtb+renesas@gmail.com>
---
 drivers/i2c/busses/i2c-sh_mobile.c |   28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/drivers/i2c/busses/i2c-sh_mobile.c b/drivers/i2c/busses/i2c-sh_mobile.c
index b6e7a83..da28164 100644
--- a/drivers/i2c/busses/i2c-sh_mobile.c
+++ b/drivers/i2c/busses/i2c-sh_mobile.c
@@ -132,6 +132,7 @@ struct sh_mobile_i2c_data {
 	struct i2c_msg *msg;
 	int pos;
 	int sr;
+	bool is_suspended;
 };
 
 #define IIC_FLAG_HAS_ICIC67	(1 << 0)
@@ -511,6 +512,9 @@ static int sh_mobile_i2c_xfer(struct i2c_adapter *adapter,
 	u_int8_t val;
 	int i, k, retry_count;
 
+	if (pd->is_suspended)
+		return -EBUSY;
+
 	activate_ch(pd);
 
 	/* Process all messages */
@@ -753,9 +757,33 @@ static int sh_mobile_i2c_runtime_nop(struct device *dev)
 	return 0;
 }
 
+static int sh_mobile_i2c_suspend(struct device *dev)
+{
+	struct sh_mobile_i2c_data *pd = dev_get_drvdata(dev);
+
+	i2c_lock_adapter(&pd->adap);
+	pd->is_suspended = true;
+	i2c_unlock_adapter(&pd->adap);
+
+	return 0;
+}
+
+static int sh_mobile_i2c_resume(struct device *dev)
+{
+	struct sh_mobile_i2c_data *pd = dev_get_drvdata(dev);
+
+	i2c_lock_adapter(&pd->adap);
+	pd->is_suspended = false;
+	i2c_unlock_adapter(&pd->adap);
+
+	return 0;
+}
+
 static const struct dev_pm_ops sh_mobile_i2c_dev_pm_ops = {
 	.runtime_suspend = sh_mobile_i2c_runtime_nop,
 	.runtime_resume = sh_mobile_i2c_runtime_nop,
+	.suspend = sh_mobile_i2c_suspend,
+	.resume = sh_mobile_i2c_resume,
 };
 
 static const struct of_device_id sh_mobile_i2c_dt_ids[] = {
-- 
1.7.9.5