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| author | Michael Hennerich <michael.hennerich@analog.com> | 2010-06-30 14:51:09 -0700 |
|---|---|---|
| committer | Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2010-07-03 13:13:19 -0700 |
| commit | 16ea10a7d557a0177cbbd716b4a06e5373d513ba (patch) | |
| tree | 6d2dd43c1a5ce6bbf4b056e0e8c39d96fc7acf0d /drivers | |
| parent | 14fbbc36d126d7ec7717144def386b9fc4c7fba2 (diff) | |
| download | linux-16ea10a7d557a0177cbbd716b4a06e5373d513ba.tar.gz linux-16ea10a7d557a0177cbbd716b4a06e5373d513ba.tar.bz2 linux-16ea10a7d557a0177cbbd716b4a06e5373d513ba.zip | |
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>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/input/touchscreen/ad7879-i2c.c | 5 |
1 files changed, 4 insertions, 1 deletions
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; } |