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authorLinus Walleij <linus.walleij@linaro.org>2021-03-19 16:53:01 +0300
committerJonathan Cameron <Jonathan.Cameron@huawei.com>2021-03-25 22:13:52 +0300
commite1d392dc8875556d8a742d4be38ab452516428eb (patch)
treed94ba0fad53ea944dcd703485f706c3569343ea1 /tools/iio/iio_event_monitor.c
parent346e19ec04e07789d1fc9982d6adc016582620cd (diff)
downloadlinux-e1d392dc8875556d8a742d4be38ab452516428eb.tar.xz
iio: event_monitor: Enable events before monitoring
After some painful sessions with a driver that register an enable/disable sysfs knob (gp2ap002) and manually going in and enabling the event before monitoring it: cd /sys/bus/iio/devices/iio\:device2/events # ls in_proximity_thresh_either_en # echo 1 > in_proximity_thresh_either_en I realized that it's better if the iio_event_monitor is smart enough to enable all events by itself and disable them after use, if passed the -a flag familiar from the iio_generic_buffer tool. Auto-enabling events depend on the hardware being able to handle all events at the same time which isn't necessarily the case, so a command line option is required for this. Cc: Bastien Nocera <hadess@hadess.net> Signed-off-by: Linus Walleij <linus.walleij@linaro.org> Link: https://lore.kernel.org/r/20210319135301.542911-1-linus.walleij@linaro.org Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Diffstat (limited to 'tools/iio/iio_event_monitor.c')
-rw-r--r--tools/iio/iio_event_monitor.c69
1 files changed, 64 insertions, 5 deletions
diff --git a/tools/iio/iio_event_monitor.c b/tools/iio/iio_event_monitor.c
index bb03859db89d..0076437f6e3f 100644
--- a/tools/iio/iio_event_monitor.c
+++ b/tools/iio/iio_event_monitor.c
@@ -14,6 +14,7 @@
#include <unistd.h>
#include <stdlib.h>
+#include <dirent.h>
#include <stdbool.h>
#include <stdio.h>
#include <errno.h>
@@ -280,22 +281,69 @@ static void print_event(struct iio_event_data *event)
printf("\n");
}
+/* Enable or disable events in sysfs if the knob is available */
+static void enable_events(char *dev_dir, int enable)
+{
+ const struct dirent *ent;
+ char evdir[256];
+ int ret;
+ DIR *dp;
+
+ snprintf(evdir, sizeof(evdir), FORMAT_EVENTS_DIR, dev_dir);
+ evdir[sizeof(evdir)-1] = '\0';
+
+ dp = opendir(evdir);
+ if (!dp) {
+ fprintf(stderr, "Enabling/disabling events: can't open %s\n",
+ evdir);
+ return;
+ }
+
+ while (ent = readdir(dp), ent) {
+ if (iioutils_check_suffix(ent->d_name, "_en")) {
+ printf("%sabling: %s\n",
+ enable ? "En" : "Dis",
+ ent->d_name);
+ ret = write_sysfs_int(ent->d_name, evdir,
+ enable);
+ if (ret < 0)
+ fprintf(stderr, "Failed to enable/disable %s\n",
+ ent->d_name);
+ }
+ }
+
+ if (closedir(dp) == -1) {
+ perror("Enabling/disabling channels: "
+ "Failed to close directory");
+ return;
+ }
+}
+
int main(int argc, char **argv)
{
struct iio_event_data event;
const char *device_name;
+ char *dev_dir_name = NULL;
char *chrdev_name;
int ret;
int dev_num;
int fd, event_fd;
-
- if (argc <= 1) {
- fprintf(stderr, "Usage: %s <device_name>\n", argv[0]);
+ bool all_events = false;
+
+ if (argc == 2) {
+ device_name = argv[1];
+ } else if (argc == 3) {
+ device_name = argv[2];
+ if (!strcmp(argv[1], "-a"))
+ all_events = true;
+ } else {
+ fprintf(stderr,
+ "Usage: iio_event_monitor [options] <device_name>\n"
+ "Listen and display events from IIO devices\n"
+ " -a Auto-activate all available events\n");
return -1;
}
- device_name = argv[1];
-
dev_num = find_type_by_name(device_name, "iio:device");
if (dev_num >= 0) {
printf("Found IIO device with name %s with device number %d\n",
@@ -303,6 +351,10 @@ int main(int argc, char **argv)
ret = asprintf(&chrdev_name, "/dev/iio:device%d", dev_num);
if (ret < 0)
return -ENOMEM;
+ /* Look up sysfs dir as well if we can */
+ ret = asprintf(&dev_dir_name, "%siio:device%d", iio_dir, dev_num);
+ if (ret < 0)
+ return -ENOMEM;
} else {
/*
* If we can't find an IIO device by name assume device_name is
@@ -313,6 +365,9 @@ int main(int argc, char **argv)
return -ENOMEM;
}
+ if (all_events && dev_dir_name)
+ enable_events(dev_dir_name, 1);
+
fd = open(chrdev_name, 0);
if (fd == -1) {
ret = -errno;
@@ -365,6 +420,10 @@ int main(int argc, char **argv)
perror("Failed to close event file");
error_free_chrdev_name:
+ /* Disable events after use */
+ if (all_events && dev_dir_name)
+ enable_events(dev_dir_name, 0);
+
free(chrdev_name);
return ret;