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diff --git a/usr.sbin/spi/spi.8 b/usr.sbin/spi/spi.8
--- a/usr.sbin/spi/spi.8
+++ b/usr.sbin/spi/spi.8
@@ -38,6 +38,7 @@
.Op Fl d Cm r Ns | Ns Cm w Ns | Ns Cm rw
.Op Fl f Ar device
.Op Fl m Ar mode
+.Op Fl S
.Op Fl s Ar max-speed
.Nm
.Op Fl i
@@ -145,6 +146,12 @@
SPI mode, 0 through 3.
This defines the clock phase and timing with respect to reading and writing
data, as per the SPI specification.
+.It Fl S
+Constantly stream from
+.Xr stdin 3
+to the
+.Nm
+bus.
.It Fl s Ar speed
Specify the maximum speed, in Hz, for the SPI clock.
The bus will operate at its highest available speed which does not
diff --git a/usr.sbin/spi/spi.c b/usr.sbin/spi/spi.c
--- a/usr.sbin/spi/spi.c
+++ b/usr.sbin/spi/spi.c
@@ -129,7 +129,7 @@
fputs(" - communicate on SPI bus with slave devices\n"
"Usage:\n"
" spi [-f device] [-d r|w|rw] [-m mode] [-s max-speed] [-c count]\n"
- " [-C \"command bytes\"] [-A] [-b] [-L] [-v]\n"
+ " [-C \"command bytes\"] [-A] [-b] [-L] [-S] [-v]\n"
" spi -i [-f device] [-v]\n"
" spi -h\n"
" where\n"
@@ -145,6 +145,7 @@
" -i query information about the device\n"
" -A uses ASCII for input/output as 2-digit hex values\n"
" -b Override output format as binary (only valid with '-A')\n"
+ " -S constantly stream from stdin to bus\n"
" -v verbose output\n"
" -h prints this message\n"
"\n"
@@ -158,11 +159,12 @@
main(int argc, char *argv[], char *envp[] __unused)
{
struct spi_options opt;
- int err, ch, hdev, finfo, fdir;
+ int err, ch, hdev, finfo, stream, fdir;
char *pstr;
char dev_name[PATH_MAX * 2 + 5];
finfo = 0;
+ stream = 0;
fdir = DIR_NONE;
hdev = -1;
@@ -180,7 +182,7 @@
opt.ncmd = 0;
opt.pcmd = NULL;
- while (!err && (ch = getopt(argc, argv, "f:d:m:s:c:C:AbLvih")) != -1) {
+ while (!err && (ch = getopt(argc, argv, "f:d:m:s:c:C:AbLviSh")) != -1) {
switch (ch) {
case 'd':
if (optarg[0] == 'r') {
@@ -275,6 +277,10 @@
finfo = 1;
break;
+ case 'S':
+ stream = 1;
+ break;
+
default:
err = 1;
/* FALLTHROUGH */
@@ -358,14 +364,29 @@
/* do data transfer */
- if (fdir == DIR_READ) {
- err = perform_read(hdev, &opt);
- }
- else if (fdir == DIR_WRITE) {
- err = perform_write(hdev, &opt);
+ if (stream) {
+ while (!err && !feof(stdin)) {
+ if (fdir == DIR_READ) {
+ err = perform_read(hdev, &opt);
+ }
+ else if (fdir == DIR_WRITE) {
+ err = perform_write(hdev, &opt);
+ }
+ else if (fdir == DIR_READWRITE) {
+ err = perform_readwrite(hdev, &opt);
+ }
+ }
}
- else if (fdir == DIR_READWRITE) {
- err = perform_readwrite(hdev, &opt);
+ else {
+ if (fdir == DIR_READ) {
+ err = perform_read(hdev, &opt);
+ }
+ else if (fdir == DIR_WRITE) {
+ err = perform_write(hdev, &opt);
+ }
+ else if (fdir == DIR_READWRITE) {
+ err = perform_readwrite(hdev, &opt);
+ }
}
the_end:

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