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SPI controller drivers: check for unsupported modes

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Minor SPI controller driver updates: make the setup() methods reject
spi->mode bits they don't support, by masking aginst the inverse of bits
they *do* support.  This insures against misbehavior later when new mode
bits get added.

Most controllers can't support SPI_LSB_FIRST; more handle SPI_CS_HIGH.
Support for all four SPI clock/transfer modes is routine.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
David Brownell 2007-07-17 04:04:02 -07:00 committed by Linus Torvalds
parent ff294cba8a
commit dccd573bb0
10 changed files with 66 additions and 21 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

1
drivers/spi/atmel_spi.c
View file

@ -350,6 +350,7 @@ atmel_spi_interrupt(int irq, void *dev_id)
return ret;
}
/* the spi->mode bits understood by this driver: */
#define MODEBITS (SPI_CPOL | SPI_CPHA | SPI_CS_HIGH)
static int atmel_spi_setup(struct spi_device *spi)

9
drivers/spi/au1550_spi.c
View file

@ -280,6 +280,9 @@ static int au1550_spi_setupxfer(struct spi_device *spi, struct spi_transfer *t)
return 0;
}
/* the spi->mode bits understood by this driver: */
#define MODEBITS (SPI_CPOL | SPI_CPHA | SPI_CS_HIGH | SPI_LSB_FIRST)
static int au1550_spi_setup(struct spi_device *spi)
{
struct au1550_spi *hw = spi_master_get_devdata(spi->master);
@ -292,6 +295,12 @@ static int au1550_spi_setup(struct spi_device *spi)
return -EINVAL;
}
if (spi->mode & ~MODEBITS) {
dev_dbg(&spi->dev, "setup: unsupported mode bits %x\n",
spi->mode & ~MODEBITS);
return -EINVAL;
}
if (spi->max_speed_hz == 0)
spi->max_speed_hz = hw->freq_max;
if (spi->max_speed_hz > hw->freq_max

9
drivers/spi/mpc52xx_psc_spi.c
View file

@ -270,6 +270,9 @@ static void mpc52xx_psc_spi_work(struct work_struct *work)
spin_unlock_irq(&mps->lock);
}
/* the spi->mode bits understood by this driver: */
#define MODEBITS (SPI_CPOL | SPI_CPHA | SPI_CS_HIGH | SPI_LSB_FIRST)
static int mpc52xx_psc_spi_setup(struct spi_device *spi)
{
struct mpc52xx_psc_spi *mps = spi_master_get_devdata(spi->master);
@ -279,6 +282,12 @@ static int mpc52xx_psc_spi_setup(struct spi_device *spi)
if (spi->bits_per_word%8)
return -EINVAL;
if (spi->mode & ~MODEBITS) {
dev_dbg(&spi->dev, "setup: unsupported mode bits %x\n",
spi->mode & ~MODEBITS);
return -EINVAL;
}
if (!cs) {
cs = kzalloc(sizeof *cs, GFP_KERNEL);
if (!cs)

9
drivers/spi/omap_uwire.c
View file

@ -445,10 +445,19 @@ done:
return status;
}
/* the spi->mode bits understood by this driver: */
#define MODEBITS (SPI_CPOL | SPI_CPHA | SPI_CS_HIGH)
static int uwire_setup(struct spi_device *spi)
{
struct uwire_state *ust = spi->controller_state;
if (spi->mode & ~MODEBITS) {
dev_dbg(&spi->dev, "setup: unsupported mode bits %x\n",
spi->mode & ~MODEBITS);
return -EINVAL;
}
if (ust == NULL) {
ust = kzalloc(sizeof(*ust), GFP_KERNEL);
if (ust == NULL)

9
drivers/spi/pxa2xx_spi.c
View file

@ -1067,6 +1067,9 @@ static int transfer(struct spi_device *spi, struct spi_message *msg)
return 0;
}
/* the spi->mode bits understood by this driver: */
#define MODEBITS (SPI_CPOL | SPI_CPHA)
static int setup(struct spi_device *spi)
{
struct pxa2xx_spi_chip *chip_info = NULL;
@ -1093,6 +1096,12 @@ static int setup(struct spi_device *spi)
return -EINVAL;
}
if (spi->mode & ~MODEBITS) {
dev_dbg(&spi->dev, "setup: unsupported mode bits %x\n",
spi->mode & ~MODEBITS);
return -EINVAL;
}
/* Only alloc on first setup */
chip = spi_get_ctldata(spi);
if (!chip) {

8
drivers/spi/spi_bitbang.c
View file

@ -187,12 +187,10 @@ int spi_bitbang_setup(struct spi_device *spi)
bitbang = spi_master_get_devdata(spi->master);
/* REVISIT: some systems will want to support devices using lsb-first
* bit encodings on the wire. In pure software that would be trivial,
* just bitbang_txrx_le_cphaX() routines shifting the other way, and
* some hardware controllers also have this support.
/* Bitbangers can support SPI_CS_HIGH, SPI_3WIRE, and so on;
* add those to master->flags, and provide the other support.
*/
if ((spi->mode & SPI_LSB_FIRST) != 0)
if ((spi->mode & ~(SPI_CPOL|SPI_CPHA|bitbang->flags)) != 0)
return -EINVAL;
if (!cs) {

24
drivers/spi/spi_imx.c
View file

@ -1163,6 +1163,9 @@ msg_rejected:
return -EINVAL;
}
/* the spi->mode bits understood by this driver: */
#define MODEBITS (SPI_CPOL | SPI_CPHA | SPI_CS_HIGH)
/* On first setup bad values must free chip_data memory since will cause
spi_new_device to fail. Bad value setup from protocol driver are simply not
applied and notified to the calling driver. */
@ -1174,6 +1177,12 @@ static int setup(struct spi_device *spi)
u32 tmp;
int status = 0;
if (spi->mode & ~MODEBITS) {
dev_dbg(&spi->dev, "setup: unsupported mode bits %x\n",
spi->mode & ~MODEBITS);
return -EINVAL;
}
/* Get controller data */
chip_info = spi->controller_data;
@ -1245,21 +1254,6 @@ static int setup(struct spi_device *spi)
/* SPI mode */
tmp = spi->mode;
if (tmp & SPI_LSB_FIRST) {
status = -EINVAL;
if (first_setup) {
dev_err(&spi->dev,
"setup - "
"HW doesn't support LSB first transfer\n");
goto err_first_setup;
} else {
dev_err(&spi->dev,
"setup - "
"HW doesn't support LSB first transfer, "
"default to MSB first\n");
spi->mode &= ~SPI_LSB_FIRST;
}
}
if (tmp & SPI_CS_HIGH) {
u32_EDIT(chip->control,
SPI_CONTROL_SSPOL, SPI_CONTROL_SSPOL_ACT_HIGH);

9
drivers/spi/spi_mpc83xx.c
View file

@ -232,12 +232,21 @@ int mpc83xx_spi_setup_transfer(struct spi_device *spi, struct spi_transfer *t)
return 0;
}
/* the spi->mode bits understood by this driver: */
#define MODEBITS (SPI_CPOL | SPI_CPHA | SPI_CS_HIGH)
static int mpc83xx_spi_setup(struct spi_device *spi)
{
struct spi_bitbang *bitbang;
struct mpc83xx_spi *mpc83xx_spi;
int retval;
if (spi->mode & ~MODEBITS) {
dev_dbg(&spi->dev, "setup: unsupported mode bits %x\n",
spi->mode & ~MODEBITS);
return -EINVAL;
}
if (!spi->max_speed_hz)
return -EINVAL;

8
drivers/spi/spi_s3c24xx.c
View file

@ -146,6 +146,9 @@ static int s3c24xx_spi_setupxfer(struct spi_device *spi,
return 0;
}
/* the spi->mode bits understood by this driver: */
#define MODEBITS (SPI_CPOL | SPI_CPHA | SPI_CS_HIGH)
static int s3c24xx_spi_setup(struct spi_device *spi)
{
int ret;
@ -153,8 +156,11 @@ static int s3c24xx_spi_setup(struct spi_device *spi)
if (!spi->bits_per_word)
spi->bits_per_word = 8;
if ((spi->mode & SPI_LSB_FIRST) != 0)
if (spi->mode & ~MODEBITS) {
dev_dbg(&spi->dev, "setup: unsupported mode bits %x\n",
spi->mode & ~MODEBITS);
return -EINVAL;
}
ret = s3c24xx_spi_setupxfer(spi, NULL);
if (ret < 0) {

1
include/linux/spi/spi_bitbang.h
View file

@ -26,6 +26,7 @@ struct spi_bitbang {
struct list_head queue;
u8 busy;
u8 use_dma;
u8 flags; /* extra spi->mode support */
struct spi_master *master;