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Diffstat (limited to 'tools/iio/iio_generic_buffer.c')
-rw-r--r--tools/iio/iio_generic_buffer.c122
1 files changed, 96 insertions, 26 deletions
diff --git a/tools/iio/iio_generic_buffer.c b/tools/iio/iio_generic_buffer.c
index 7c7240553777..2491c54a5e4f 100644
--- a/tools/iio/iio_generic_buffer.c
+++ b/tools/iio/iio_generic_buffer.c
@@ -30,6 +30,8 @@
#include <inttypes.h>
#include <stdbool.h>
#include <signal.h>
+#include <sys/ioctl.h>
+#include <linux/iio/buffer.h>
#include "iio_utils.h"
/**
@@ -197,7 +199,7 @@ static void process_scan(char *data, struct iio_channel_info *channels,
printf("\n");
}
-static int enable_disable_all_channels(char *dev_dir_name, int enable)
+static int enable_disable_all_channels(char *dev_dir_name, int buffer_idx, int enable)
{
const struct dirent *ent;
char scanelemdir[256];
@@ -205,7 +207,7 @@ static int enable_disable_all_channels(char *dev_dir_name, int enable)
int ret;
snprintf(scanelemdir, sizeof(scanelemdir),
- FORMAT_SCAN_ELEMENTS_DIR, dev_dir_name);
+ FORMAT_SCAN_ELEMENTS_DIR, dev_dir_name, buffer_idx);
scanelemdir[sizeof(scanelemdir)-1] = '\0';
dp = opendir(scanelemdir);
@@ -243,6 +245,7 @@ static void print_usage(void)
"Capture, convert and output data from IIO device buffer\n"
" -a Auto-activate all available channels\n"
" -A Force-activate ALL channels\n"
+ " -b <n> The buffer which to open (by index), default 0\n"
" -c <n> Do n conversions, or loop forever if n < 0\n"
" -e Disable wait for event (new data)\n"
" -g Use trigger-less mode\n"
@@ -259,6 +262,7 @@ static void print_usage(void)
static enum autochan autochannels = AUTOCHANNELS_DISABLED;
static char *dev_dir_name = NULL;
static char *buf_dir_name = NULL;
+static int buffer_idx = 0;
static bool current_trigger_set = false;
static void cleanup(void)
@@ -286,7 +290,7 @@ static void cleanup(void)
/* Disable channels if auto-enabled */
if (dev_dir_name && autochannels == AUTOCHANNELS_ACTIVE) {
- ret = enable_disable_all_channels(dev_dir_name, 0);
+ ret = enable_disable_all_channels(dev_dir_name, buffer_idx, 0);
if (ret)
fprintf(stderr, "Failed to disable all channels\n");
autochannels = AUTOCHANNELS_DISABLED;
@@ -333,7 +337,9 @@ int main(int argc, char **argv)
unsigned long long j;
unsigned long toread;
int ret, c;
- int fp = -1;
+ struct stat st;
+ int fd = -1;
+ int buf_fd = -1;
int num_channels = 0;
char *trigger_name = NULL, *device_name = NULL;
@@ -352,7 +358,7 @@ int main(int argc, char **argv)
register_cleanup();
- while ((c = getopt_long(argc, argv, "aAc:egl:n:N:t:T:w:?", longopts,
+ while ((c = getopt_long(argc, argv, "aAb:c:egl:n:N:t:T:w:?", longopts,
NULL)) != -1) {
switch (c) {
case 'a':
@@ -361,7 +367,20 @@ int main(int argc, char **argv)
case 'A':
autochannels = AUTOCHANNELS_ENABLED;
force_autochannels = true;
- break;
+ break;
+ case 'b':
+ errno = 0;
+ buffer_idx = strtoll(optarg, &dummy, 10);
+ if (errno) {
+ ret = -errno;
+ goto error;
+ }
+ if (buffer_idx < 0) {
+ ret = -ERANGE;
+ goto error;
+ }
+
+ break;
case 'c':
errno = 0;
num_loops = strtoll(optarg, &dummy, 10);
@@ -518,7 +537,7 @@ int main(int argc, char **argv)
* Parse the files in scan_elements to identify what channels are
* present
*/
- ret = build_channel_array(dev_dir_name, &channels, &num_channels);
+ ret = build_channel_array(dev_dir_name, buffer_idx, &channels, &num_channels);
if (ret) {
fprintf(stderr, "Problem reading scan element information\n"
"diag %s\n", dev_dir_name);
@@ -535,7 +554,7 @@ int main(int argc, char **argv)
(autochannels == AUTOCHANNELS_ENABLED && force_autochannels)) {
fprintf(stderr, "Enabling all channels\n");
- ret = enable_disable_all_channels(dev_dir_name, 1);
+ ret = enable_disable_all_channels(dev_dir_name, buffer_idx, 1);
if (ret) {
fprintf(stderr, "Failed to enable all channels\n");
goto error;
@@ -544,7 +563,7 @@ int main(int argc, char **argv)
/* This flags that we need to disable the channels again */
autochannels = AUTOCHANNELS_ACTIVE;
- ret = build_channel_array(dev_dir_name, &channels,
+ ret = build_channel_array(dev_dir_name, buffer_idx, &channels,
&num_channels);
if (ret) {
fprintf(stderr, "Problem reading scan element "
@@ -565,7 +584,7 @@ int main(int argc, char **argv)
fprintf(stderr, "Enable channels manually in "
FORMAT_SCAN_ELEMENTS_DIR
"/*_en or pass -a to autoenable channels and "
- "try again.\n", dev_dir_name);
+ "try again.\n", dev_dir_name, buffer_idx);
ret = -ENOENT;
goto error;
}
@@ -576,12 +595,25 @@ int main(int argc, char **argv)
* be built rather than found.
*/
ret = asprintf(&buf_dir_name,
- "%siio:device%d/buffer", iio_dir, dev_num);
+ "%siio:device%d/buffer%d", iio_dir, dev_num, buffer_idx);
if (ret < 0) {
ret = -ENOMEM;
goto error;
}
+ if (stat(buf_dir_name, &st)) {
+ fprintf(stderr, "Could not stat() '%s', got error %d: %s\n",
+ buf_dir_name, errno, strerror(errno));
+ ret = -errno;
+ goto error;
+ }
+
+ if (!S_ISDIR(st.st_mode)) {
+ fprintf(stderr, "File '%s' is not a directory\n", buf_dir_name);
+ ret = -EFAULT;
+ goto error;
+ }
+
if (!notrigger) {
printf("%s %s\n", dev_dir_name, trigger_name);
/*
@@ -598,6 +630,35 @@ int main(int argc, char **argv)
}
}
+ ret = asprintf(&buffer_access, "/dev/iio:device%d", dev_num);
+ if (ret < 0) {
+ ret = -ENOMEM;
+ goto error;
+ }
+
+ /* Attempt to open non blocking the access dev */
+ fd = open(buffer_access, O_RDONLY | O_NONBLOCK);
+ if (fd == -1) { /* TODO: If it isn't there make the node */
+ ret = -errno;
+ fprintf(stderr, "Failed to open %s\n", buffer_access);
+ goto error;
+ }
+
+ /* specify for which buffer index we want an FD */
+ buf_fd = buffer_idx;
+
+ ret = ioctl(fd, IIO_BUFFER_GET_FD_IOCTL, &buf_fd);
+ if (ret == -1 || buf_fd == -1) {
+ ret = -errno;
+ if (ret == -ENODEV || ret == -EINVAL)
+ fprintf(stderr,
+ "Device does not have this many buffers\n");
+ else
+ fprintf(stderr, "Failed to retrieve buffer fd\n");
+
+ goto error;
+ }
+
/* Setup ring buffer parameters */
ret = write_sysfs_int("length", buf_dir_name, buf_len);
if (ret < 0)
@@ -607,7 +668,8 @@ int main(int argc, char **argv)
ret = write_sysfs_int("enable", buf_dir_name, 1);
if (ret < 0) {
fprintf(stderr,
- "Failed to enable buffer: %s\n", strerror(-ret));
+ "Failed to enable buffer '%s': %s\n",
+ buf_dir_name, strerror(-ret));
goto error;
}
@@ -618,24 +680,30 @@ int main(int argc, char **argv)
goto error;
}
- ret = asprintf(&buffer_access, "/dev/iio:device%d", dev_num);
- if (ret < 0) {
- ret = -ENOMEM;
- goto error;
+ /**
+ * This check is being done here for sanity reasons, however it
+ * should be omitted under normal operation.
+ * If this is buffer0, we check that we get EBUSY after this point.
+ */
+ if (buffer_idx == 0) {
+ errno = 0;
+ read_size = read(fd, data, 1);
+ if (read_size > -1 || errno != EBUSY) {
+ ret = -EFAULT;
+ perror("Reading from '%s' should not be possible after ioctl()");
+ goto error;
+ }
}
- /* Attempt to open non blocking the access dev */
- fp = open(buffer_access, O_RDONLY | O_NONBLOCK);
- if (fp == -1) { /* TODO: If it isn't there make the node */
- ret = -errno;
- fprintf(stderr, "Failed to open %s\n", buffer_access);
- goto error;
- }
+ /* close now the main chardev FD and let the buffer FD work */
+ if (close(fd) == -1)
+ perror("Failed to close character device file");
+ fd = -1;
for (j = 0; j < num_loops || num_loops < 0; j++) {
if (!noevents) {
struct pollfd pfd = {
- .fd = fp,
+ .fd = buf_fd,
.events = POLLIN,
};
@@ -653,7 +721,7 @@ int main(int argc, char **argv)
toread = 64;
}
- read_size = read(fp, data, toread * scan_size);
+ read_size = read(buf_fd, data, toread * scan_size);
if (read_size < 0) {
if (errno == EAGAIN) {
fprintf(stderr, "nothing available\n");
@@ -670,7 +738,9 @@ int main(int argc, char **argv)
error:
cleanup();
- if (fp >= 0 && close(fp) == -1)
+ if (fd >= 0 && close(fd) == -1)
+ perror("Failed to close character device");
+ if (buf_fd >= 0 && close(buf_fd) == -1)
perror("Failed to close buffer");
free(buffer_access);
free(data);
generated by cgit v1.2.3 (git 2.39.0) at 2024-11-24 21:17:47 +0300