linux-kernel - [RFC/PATCHv2 1/3] driver: spi: Modify core to compute the message length

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Message-ID: <1374141687-10790-2-git-send-email-sourav.poddar@ti.com>
Date:	Thu, 18 Jul 2013 15:31:25 +0530
From:	Sourav Poddar <sourav.poddar@...com>
To:	<broonie@...nel.org>, <spi-devel-general@...ts.sourceforge.net>,
	<grant.likely@...aro.org>
CC:	<balbi@...com>, <rnayak@...com>, <linux-omap@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>,
	Sourav Poddar <sourav.poddar@...com>
Subject: [RFC/PATCHv2 1/3] driver: spi: Modify core to compute the message length

Make spi core calculate the message length while
populating the other transfer parameters.

Usecase, driver can use it to populate framelength filed in their
controller.

Signed-off-by: Sourav Poddar <sourav.poddar@...com>
---
 drivers/spi/spi.c       |    1 +
 include/linux/spi/spi.h |    1 +
 2 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index 32b7bb1..6a05b3c 100644
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -1375,6 +1375,7 @@ static int __spi_async(struct spi_device *spi, struct spi_message *message)
 	 * it is not set for this transfer.
 	 */
 	list_for_each_entry(xfer, &message->transfers, transfer_list) {
+		message->frame_length += xfer->len;
 		if (!xfer->bits_per_word)
 			xfer->bits_per_word = spi->bits_per_word;
 		if (!xfer->speed_hz)
diff --git a/include/linux/spi/spi.h b/include/linux/spi/spi.h
index 6ff26c8..d83841e 100644
--- a/include/linux/spi/spi.h
+++ b/include/linux/spi/spi.h
@@ -575,6 +575,7 @@ struct spi_message {
 	/* completion is reported through a callback */
 	void			(*complete)(void *context);
 	void			*context;
+	unsigned		frame_length;
 	unsigned		actual_length;
 	int			status;
 
-- 
1.7.1

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