From cd9b6fdf798841eb15253f928e762eee5260d347 Mon Sep 17 00:00:00 2001 From: Oskar Schirmer Date: Tue, 8 Jun 2010 01:12:22 -0700 Subject: [PATCH] Input: ad7877 - fix spi word size to 16 bit MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit With no word size given in the users platform data, a generic spi host controller driver will assume a default word size of eight bit. This causes transmission to be performed bytewise, which will fail on little endian machines for sure. Failure on big endian depends on usage of slave select to mark word boundaries. Anyway, ad7877 is specified to work with 16 bit per word, so unconditionally set the word size accordingly. Flag an error where 16 bit per word is not available. Signed-off-by: Oskar Schirmer Signed-off-by: Daniel Glöckner Signed-off-by: Oliver Schneidewind Signed-off-by: Dmitry Torokhov --- drivers/input/touchscreen/ad7877.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/input/touchscreen/ad7877.c b/drivers/input/touchscreen/ad7877.c index 0d2d7e5..5f0221c 100644 --- a/drivers/input/touchscreen/ad7877.c +++ b/drivers/input/touchscreen/ad7877.c @@ -679,6 +679,13 @@ static int __devinit ad7877_probe(struct spi_device *spi) return -EINVAL; } + spi->bits_per_word = 16; + err = spi_setup(spi); + if (err) { + dev_dbg(&spi->dev, "spi master doesn't support 16 bits/word\n"); + return err; + } + ts = kzalloc(sizeof(struct ad7877), GFP_KERNEL); input_dev = input_allocate_device(); if (!ts || !input_dev) { -- 2.7.4