From pavel@ucw.cz  Mon Aug 17 13:06:02 2009
From: Pavel Machek <pavel@ucw.cz>
Date: Sat, 8 Aug 2009 15:40:50 +0200
Subject: Staging: dream: Synaptics touchscreen: check that smbus is available
To: Trilok Soni <soni.trilok@gmail.com>, Greg KH <greg@kroah.com>
Cc: Arve Hj?nnev?g <arve@android.com>, Brian Swetland <swetland@google.com>, dmitry.torokhov@gmail.com, dtor@mail.ru, linux-input@vger.kernel.org, Andrew Morton <akpm@osdl.org>, linux-i2c@vger.kernel.org
Message-ID: <20090808134049.GA13083@elf.ucw.cz>
Content-Disposition: inline



Check that SMBUS APIs are available in touchscreen driver.

Signed-off-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
 drivers/staging/dream/synaptics_i2c_rmi.c |    6 ++++++
 1 file changed, 6 insertions(+)

--- 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;