[PATCH 364/641] Staging: dream: Synaptics touchscreen: check that smbus is available

[Greg Kroah-Hartman]

From: Pavel Machek <pavel at ucw.cz>

Check that SMBUS APIs are available in touchscreen driver.

Signed-off-by: Pavel Machek <pavel at ucw.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh at suse.de>
---
 drivers/staging/dream/synaptics_i2c_rmi.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/drivers/staging/dream/synaptics_i2c_rmi.c b/drivers/staging/dream/synaptics_i2c_rmi.c
index 9190a9d..ae696d3 100644
--- a/drivers/staging/dream/synaptics_i2c_rmi.c
+++ b/drivers/staging/dream/synaptics_i2c_rmi.c
@@ -373,6 +373,12 @@ static int __devinit synaptics_ts_probe(
 		goto err_check_functionality_failed;
 	}
 
+	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WORD_DATA)) {
+		pr_err("synaptics_ts_probe: need I2C_FUNC_SMBUS_WORD_DATA\n");
+		ret = -ENODEV;
+		goto err_check_functionality_failed;
+	}
+
 	ts = kzalloc(sizeof(*ts), GFP_KERNEL);
 	if (ts == NULL) {
 		ret = -ENOMEM;
-- 
1.6.4.2