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spi: spidev_test: allow disabling rx or tx buffers

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Allow not providing rx or tx buffers. This is useful to check if drivers
that don't use SPI_CONTROLLER_MUST_RX (or -TX respectively) handle their
operations correctly without a buffer.

Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Jonas Rebmann <jre@pengutronix.de>
Link: https://patch.msgid.link/20260924-spi-sun4i-spidev_test-v7-8-126e31a07fdc@pengutronix.de
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Marc Kleine-Budde 2026-09-24 15:43:58 +02:00 committed by Mark Brown
parent a47226866b
commit d2b908c75a
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
1 changed files with 57 additions and 27 deletions
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84
tools/spi/spidev_test.c
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@ -45,6 +45,7 @@ static int transfer_size = -1;
static int iterations;
static int interval = 5; /* interval in seconds for showing transfer rate */
static int compare;
static int do_tx = 1, do_rx = 1;
static int random_input;
static int input_choices;
@ -157,7 +158,7 @@ static void transfer(int fd, uint8_t const *tx, uint8_t const *rx, size_t len)
if (ret < 0)
pabort("can't send spi message");
if (verbose)
if (verbose && tx)
hex_dump(tx, len, 32, "TX");
if (output_file) {
@ -172,10 +173,10 @@ static void transfer(int fd, uint8_t const *tx, uint8_t const *rx, size_t len)
close(out_fd);
}
if (verbose)
if (verbose && rx)
hex_dump(rx, len, 32, "RX");
if (compare || mode & SPI_LOOP) {
if (tx && rx && (compare || mode & SPI_LOOP)) {
if (memcmp(tx, rx, len)) {
fprintf(stderr, "transfer error !\n");
hex_dump(tx, len, 32, "TX");
@ -187,7 +188,7 @@ static void transfer(int fd, uint8_t const *tx, uint8_t const *rx, size_t len)
static void print_usage(const char *prog)
{
printf("Usage: %s [-2348CDFHILMNORSZbcdilopsvw]\n", prog);
printf("Usage: %s [-2348CDFHILMNORSZbcdiloprstvw]\n", prog);
puts("general device settings:\n"
" -D --device device to use (default /dev/spidev1.1)\n"
" -s --speed max speed (Hz)\n"
@ -195,6 +196,8 @@ static void print_usage(const char *prog)
" -w --word-delay word delay (usec)\n"
" -l --loop loopback\n"
" -c --compare compare RX'ed and TX'ed data\n"
" -t --no-tx don't send data\n"
" -r --no-rx don't receive data\n"
"spi mode:\n"
" -H --cpha clock phase\n"
" -O --cpol clock polarity\n"
@ -233,6 +236,8 @@ static void parse_opts(int argc, char *argv[])
{ "word-delay", 1, 0, 'w' },
{ "loop", 0, 0, 'l' },
{ "compare", 0, 0, 'c' },
{ "no-tx", 0, 0, 't' },
{ "no-rx", 0, 0, 'r' },
{ "cpha", 0, 0, 'H' },
{ "cpol", 0, 0, 'O' },
{ "rx-cpha-flip", 0, 0, 'F' },
@ -256,7 +261,7 @@ static void parse_opts(int argc, char *argv[])
};
int c;
c = getopt_long(argc, argv, "D:s:d:w:b:i:o:lcHOLC3ZFMNR248p:vS:I:",
c = getopt_long(argc, argv, "D:s:d:w:b:i:o:lctrHOLC3ZFMNR248p:vS:I:",
lopts, NULL);
if (c == -1)
@ -291,6 +296,12 @@ static void parse_opts(int argc, char *argv[])
case 'c':
compare = 1;
break;
case 't':
do_tx = 0;
break;
case 'r':
do_rx = 0;
break;
case 'H':
mode |= SPI_CPHA;
break;
@ -363,15 +374,17 @@ static void transfer_escaped_string(int fd, char *str)
{
size_t size = strlen(str);
uint8_t *tx;
uint8_t *rx;
uint8_t *rx = NULL;
tx = malloc(size);
if (!tx)
pabort("can't allocate tx buffer");
rx = malloc(size);
if (!rx)
pabort("can't allocate rx buffer");
if (do_rx) {
rx = malloc(size);
if (!rx)
pabort("can't allocate rx buffer");
}
size = unescape((char *)tx, str, size);
transfer(fd, tx, rx, size);
@ -385,7 +398,7 @@ static void transfer_file(int fd, char *filename)
struct stat sb;
int tx_fd;
uint8_t *tx;
uint8_t *rx;
uint8_t *rx = NULL;
if (stat(filename, &sb) == -1)
pabort("can't stat input file");
@ -398,9 +411,12 @@ static void transfer_file(int fd, char *filename)
if (!tx)
pabort("can't allocate tx buffer");
rx = malloc(sb.st_size);
if (!rx)
pabort("can't allocate rx buffer");
if (do_rx) {
rx = malloc(sb.st_size);
if (!rx)
pabort("can't allocate rx buffer");
}
bytes = read(tx_fd, tx, sb.st_size);
if (bytes != sb.st_size)
@ -431,24 +447,29 @@ static void show_transfer_rate(void)
static void transfer_buf(int fd, int len)
{
uint8_t *tx;
uint8_t *rx;
uint8_t *tx = NULL;
uint8_t *rx = NULL;
int i;
tx = malloc(len);
if (!tx)
pabort("can't allocate tx buffer");
for (i = 0; i < len; i++)
tx[i] = random();
if (do_tx) {
tx = malloc(len);
if (!tx)
pabort("can't allocate tx buffer");
for (i = 0; i < len; i++)
tx[i] = random();
}
rx = malloc(len);
if (!rx)
pabort("can't allocate rx buffer");
if (do_rx) {
rx = malloc(len);
if (!rx)
pabort("can't allocate rx buffer");
}
transfer(fd, tx, rx, len);
_write_count += len;
_read_count += len;
if (do_tx)
_write_count += len;
if (do_rx)
_read_count += len;
free(rx);
free(tx);
@ -472,6 +493,15 @@ int main(int argc, char *argv[])
if (iterations && transfer_size < 0)
pabort("-I (--iter) is only implemented for -S (--size)");
if (compare && (!do_tx || !do_rx))
pabort("-c (--compare) conflicts with -t (--no-tx) or -r (--no-rx)");
if (!do_rx && output_file)
pabort("-r (--no-rx) conflicts with -o (--output)");
if (!do_tx && transfer_size < 0)
pabort("-t (--no-tx) is only implemented for -S (--size)");
if (compare && mode & (SPI_TX_OCTAL | SPI_TX_QUAD | SPI_TX_DUAL))
pabort("-c (--compare) conflicts with -2 (--dual), -4 (--quad) or -8 (--octal)");
@ -549,7 +579,7 @@ int main(int argc, char *argv[])
printf("total: tx %.1fKB, rx %.1fKB\n",
_write_count/1024.0, _read_count/1024.0);
} else
transfer(fd, default_tx, default_rx, sizeof(default_tx));
transfer(fd, default_tx, do_rx ? default_rx : NULL, sizeof(default_tx));
close(fd);