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Date: Wed, 25 Nov 2009 17:26:03 +0900
From: Magnus Damm <magnus.damm@...il.com>
To: spi-devel-general@...ts.sourceforge.net
Cc: grant.likely@...retlab.ca, Magnus Damm <magnus.damm@...il.com>,
dbrownell@...rs.sourceforge.net, linux-kernel@...r.kernel.org,
akpm@...ux-foundation.org
Subject: [PATCH] spi: Allow using spi_bitbang_setup() with custom txrx_bufs()
From: Magnus Damm <damm@...nsource.se>
This patch modifies the shared spi bitbanging code
to allow using spi_bitbang_setup() even though the
txrx_word[] callbacks are unset. Useful for drivers
that want to make use of spi_bitbang_setup() but
have their own txrx_bufs() callback.
While at it, drop the MSIOF driver workaround.
Signed-off-by: Magnus Damm <damm@...nsource.se>
---
Depends on the MSIOF driver.
drivers/spi/spi_bitbang.c | 25 ++++++++++++++-----------
drivers/spi/spi_sh_msiof.c | 11 -----------
2 files changed, 14 insertions(+), 22 deletions(-)
--- 0001/drivers/spi/spi_bitbang.c
+++ work/drivers/spi/spi_bitbang.c 2009-11-25 15:30:45.000000000 +0900
@@ -176,6 +176,14 @@ int spi_bitbang_setup_transfer(struct sp
}
EXPORT_SYMBOL_GPL(spi_bitbang_setup_transfer);
+static int spi_bitbang_bufs(struct spi_device *spi, struct spi_transfer *t)
+{
+ struct spi_bitbang_cs *cs = spi->controller_state;
+ unsigned nsecs = cs->nsecs;
+
+ return cs->txrx_bufs(spi, cs->txrx_word, nsecs, t);
+}
+
/**
* spi_bitbang_setup - default setup for per-word I/O loops
*/
@@ -183,6 +191,7 @@ int spi_bitbang_setup(struct spi_device
{
struct spi_bitbang_cs *cs = spi->controller_state;
struct spi_bitbang *bitbang;
+ int mode_mask = SPI_CPOL | SPI_CPHA;
int retval;
unsigned long flags;
@@ -196,9 +205,11 @@ int spi_bitbang_setup(struct spi_device
}
/* per-word shift register access, in hardware or bitbanging */
- cs->txrx_word = bitbang->txrx_word[spi->mode & (SPI_CPOL|SPI_CPHA)];
- if (!cs->txrx_word)
- return -EINVAL;
+ if (bitbang->txrx_bufs == spi_bitbang_bufs) {
+ cs->txrx_word = bitbang->txrx_word[spi->mode & mode_mask];
+ if (!cs->txrx_word)
+ return -EINVAL;
+ }
retval = bitbang->setup_transfer(spi, NULL);
if (retval < 0)
@@ -232,14 +243,6 @@ void spi_bitbang_cleanup(struct spi_devi
}
EXPORT_SYMBOL_GPL(spi_bitbang_cleanup);
-static int spi_bitbang_bufs(struct spi_device *spi, struct spi_transfer *t)
-{
- struct spi_bitbang_cs *cs = spi->controller_state;
- unsigned nsecs = cs->nsecs;
-
- return cs->txrx_bufs(spi, cs->txrx_word, nsecs, t);
-}
-
/*----------------------------------------------------------------------*/
/*
--- 0002/drivers/spi/spi_sh_msiof.c
+++ work/drivers/spi/spi_sh_msiof.c 2009-11-25 15:25:32.000000000 +0900
@@ -510,13 +510,6 @@ static int sh_msiof_spi_txrx(struct spi_
return bytes_done;
}
-static u32 sh_msiof_spi_txrx_word(struct spi_device *spi, unsigned nsecs,
- u32 word, u8 bits)
-{
- BUG_ON(1); /* unused but needed by bitbang code */
- return 0;
-}
-
static int sh_msiof_spi_probe(struct platform_device *pdev)
{
struct resource *r;
@@ -594,10 +587,6 @@ static int sh_msiof_spi_probe(struct pla
p->bitbang.chipselect = sh_msiof_spi_chipselect;
p->bitbang.setup_transfer = sh_msiof_spi_setup_transfer;
p->bitbang.txrx_bufs = sh_msiof_spi_txrx;
- p->bitbang.txrx_word[SPI_MODE_0] = sh_msiof_spi_txrx_word;
- p->bitbang.txrx_word[SPI_MODE_1] = sh_msiof_spi_txrx_word;
- p->bitbang.txrx_word[SPI_MODE_2] = sh_msiof_spi_txrx_word;
- p->bitbang.txrx_word[SPI_MODE_3] = sh_msiof_spi_txrx_word;
ret = spi_bitbang_start(&p->bitbang);
if (ret == 0)
--
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