Digi
/
meta-digi
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

dey-examples: tamper: check tamper_events before waiting for events 

If the event is already signaled, read the timestamp, log and ack the event,
perform actions and exit. If it is already acknowledged, then do nothing.
Signed-off-by: Sebastian Pastor <sebastian.pastor@digi.com>
This commit is contained in:
Sebastian Pastor 2017-06-13 22:35:10 +02:00
parent 0e93ab73d5
commit e6f072384d
1 changed files with 53 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

62
meta-digi-dey/recipes-digi/dey-examples/files/tamper_sample/tamper_sample.c
View File

@ -86,11 +86,10 @@ static void tamper_event_actions(mca_tamper_t *tdata)
static void tamper_event_ack(mca_tamper_t *tdata)
{
int ret;
char *tamper_sysfs_dir;
char tamper_sysfs_dir[sizeof("/sys/bus/iio/devices/iio:deviceX")];
ret = asprintf(&tamper_sysfs_dir,
"/sys/bus/iio/devices/iio:device%d",
tdata->dev_num);
ret = sprintf(tamper_sysfs_dir,
"/sys/bus/iio/devices/iio:device%d", tdata->dev_num);
if (ret < 0) {
fprintf(stdout, "Failed to build event ack file name\n");
return;
@ -98,15 +97,14 @@ static void tamper_event_ack(mca_tamper_t *tdata)
/* Finally, acknowledge the event */
ret = write_sysfs_string("tamper_events", tamper_sysfs_dir, "ack");
if (ret < 0) {
if (ret < 0)
fprintf(stdout, "Failed to acknowledge tamper%d event\n",
tdata->iface);
}
}
static void process_tamper_event(mca_tamper_t *tdata)
static void process_tamper_event(mca_tamper_t *tdata, bool check_event)
{
if (!event_is_tamper(&tdata->event)) {
if (check_event && !event_is_tamper(&tdata->event)) {
fprintf(stdout, "Unknown event: time: %lld, id: %llx\n",
tdata->event.timestamp, tdata->event.id);
return;
@ -117,6 +115,48 @@ static void process_tamper_event(mca_tamper_t *tdata)
tamper_event_ack(tdata);
}
static int check_tamper_event(mca_tamper_t *tdata)
{
int ret;
char tamper_sysfs_dir[sizeof("/sys/bus/iio/devices/iio:deviceX")];
char str[50];
ret = sprintf(tamper_sysfs_dir,
"/sys/bus/iio/devices/iio:device%d", tdata->dev_num);
if (ret < 0) {
fprintf(stdout, "Failed to build event file name\n");
return -1;
}
ret = read_sysfs_string("tamper_events", tamper_sysfs_dir, str);
if (ret < 0) {
fprintf(stdout, "Failed to read tamper%d event\n",
tdata->iface);
return -1;
}
if (!strncmp(str, "none", strlen("none"))) {
/* Continue to wait for tamper event to happen */
return 0;
} else if (!strncmp(str, "signaled+acked", strlen("signaled+acked"))) {
fprintf(stdout, "Tamper event already acknowledged, not taking actions\n");
return 1;
} else if (!strncmp(str, "signaled", strlen("signaled"))) {
tdata->event.timestamp = read_sysfs_posint("timestamp",
tamper_sysfs_dir);
if (tdata->event.timestamp < 0)
fprintf(stdout, "Failed to read timestamp for tamper%d!\n",
tdata->iface);
fprintf(stdout, "Tamper event was already signaled.\n");
process_tamper_event(tdata, false);
return 1;
}
fprintf(stdout, "Unkown status for tamper%d: '%s'\n", tdata->iface, str);
return -1;
}
int main(int argc, char **argv)
{
mca_tamper_t *tdata = &tamper_data;
@ -169,6 +209,10 @@ int main(int argc, char **argv)
goto error_ret2;
}
ret = check_tamper_event(tdata);
if (ret)
goto error_ret3;
fd = open(tdata->chrdev_name, 0);
if (fd < 0) {
fprintf(stdout, "Failed to open %s\n", tdata->chrdev_name);
@ -201,7 +245,7 @@ int main(int argc, char **argv)
}
}
process_tamper_event(tdata);
process_tamper_event(tdata, true);
}
close(tdata->event_fd);