From: Michael Hennerich <michael.hennerich@analog.com>
Date: Wed, 30 Jun 2010 21:51:09 +0000 (-0700)
Subject: Input: ad7879 - use i2c_smbus_read_i2c_block_data() to lower overhead
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=16ea10a7d557a0177cbbd716b4a06e5373d513ba;p=linux-beck.git

Input: ad7879 - use i2c_smbus_read_i2c_block_data() to lower overhead

Avoid additional addressing overhead incurred by word_data transfers.

Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
---

diff --git a/drivers/input/touchscreen/ad7879-i2c.c b/drivers/input/touchscreen/ad7879-i2c.c
index 81937b21e9d2..d82a38ee9a3e 100644
--- a/drivers/input/touchscreen/ad7879-i2c.c
+++ b/drivers/input/touchscreen/ad7879-i2c.c
@@ -51,10 +51,13 @@ static int ad7879_i2c_read(struct device *dev, u8 reg)
 static int ad7879_i2c_multi_read(struct device *dev,
 				 u8 first_reg, u8 count, u16 *buf)
 {
+	struct i2c_client *client = to_i2c_client(dev);
 	u8 idx;
 
+	i2c_smbus_read_i2c_block_data(client, first_reg, count * 2, (u8 *)buf);
+
 	for (idx = 0; idx < count; ++idx)
-		buf[idx] = ad7879_i2c_read(dev, first_reg + idx);
+		buf[idx] = swab16(buf[idx]);
 
 	return 0;
 }