AcoSail/kernel_optimize_test
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Input: ad7879 - use i2c_smbus_read_i2c_block_data() to lower overhead

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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>
This commit is contained in:
Michael Hennerich 2010-06-30 14:51:09 -07:00 committed by Dmitry Torokhov
parent 14fbbc36d1
commit 16ea10a7d5
1 changed files with 4 additions and 1 deletions
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5
drivers/input/touchscreen/ad7879-i2c.c
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@ -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;
}