From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Message-ID: <4CB5D566.2040301@gmail.com> Date: Wed, 13 Oct 2010 17:51:02 +0200 From: Matthias Brugger MIME-Version: 1.0 To: Jonathan Cameron CC: Grant Likely , drivers@analog.com, David Brownell , linux-iio@vger.kernel.org, Nicolas Ferre , matthias , spi-devel-general@lists.sourceforge.net, kernel@avr32linux.org Subject: [Patch] atmel_spi.c - let transfers through if not changing bits_per_word Content-Type: text/plain; charset=ISO-8859-15 List-ID: - bits_per_word option in spi_transfer are allowed if it does not change the csr register. This is necessary for the driver in drivers/staging/iio/adis16260_core.c, as it uses this option. Signed-off-by: Matthias Brugger --- drivers/spi/atmel_spi.c | 14 +++++++++++++- 1 files changed, 13 insertions(+), 1 deletions(-) diff --git a/drivers/spi/atmel_spi.c b/drivers/spi/atmel_spi.c index c4e0442..5c03a5b 100644 --- a/drivers/spi/atmel_spi.c +++ b/drivers/spi/atmel_spi.c @@ -654,6 +654,8 @@ static int atmel_spi_transfer(struct spi_device *spi, struct spi_message *msg) struct spi_transfer *xfer; unsigned long flags; struct device *controller = spi->master->dev.parent; + u8 bits; + struct atmel_spi_device *asd; as = spi_master_get_devdata(spi->master); @@ -672,8 +674,18 @@ static int atmel_spi_transfer(struct spi_device *spi, struct spi_message *msg) return -EINVAL; } + if (xfer->bits_per_word) { + asd = spi->controller_state; + bits = (asd->csr >> 4) & 0xf; + if (bits != xfer->bits_per_word - 8) { + dev_dbg(&spi->dev, "you can't yet change " + "bit_per_word in transfers\n"); + return -ENOPROTOOPT; + } + } + /* FIXME implement these protocol options!! */ - if (xfer->bits_per_word || xfer->speed_hz) { + if (xfer->speed_hz) { dev_dbg(&spi->dev, "no protocol options yet\n"); return -ENOPROTOOPT; } -- 1.5.6.5