staging:iio: update example to handle case with no ring events

Signed-off-by: Jonathan Cameron <jic23@cam.ac.uk>
Tested-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/staging/iio/Documentation/generic_buffer.c b/drivers/staging/iio/Documentation/generic_buffer.c
index df23aeb..0befcb8 100644 (file)
--- a/drivers/staging/iio/Documentation/generic_buffer.c
+++ b/drivers/staging/iio/Documentation/generic_buffer.c
@@ -26,6 +26,7 @@
 #include <sys/stat.h>
 #include <sys/dir.h>
 #include <linux/types.h>
+#include <string.h>
 #include "iio_utils.h"
 
 const int buf_len = 128;
@@ -134,10 +135,11 @@ int main(int argc, char **argv)
        int dev_num, trig_num;
        char *buffer_access, *buffer_event;
        int scan_size;
+       int noevents = 0;
 
        struct iio_channel_info *infoarray;
 
-       while ((c = getopt(argc, argv, "t:n:")) != -1) {
+       while ((c = getopt(argc, argv, "et:n:")) != -1) {
                switch (c) {
                case 'n':
                        device_name = optarg;
@@ -146,6 +148,9 @@ int main(int argc, char **argv)
                        trigger_name = optarg;
                        datardytrigger = 0;
                        break;
+               case 'e':
+                       noevents = 1;
+                       break;
                case '?':
                        return -1;
                }
@@ -260,22 +265,30 @@ int main(int argc, char **argv)
 
        /* Wait for events 10 times */
        for (j = 0; j < num_loops; j++) {
-               read_size = fread(&dat, 1, sizeof(struct iio_event_data),
-                                 fp_ev);
-               switch (dat.id) {
-               case IIO_EVENT_CODE_RING_100_FULL:
-                       toread = buf_len;
-                       break;
-               case IIO_EVENT_CODE_RING_75_FULL:
-                       toread = buf_len*3/4;
-                       break;
-               case IIO_EVENT_CODE_RING_50_FULL:
-                       toread = buf_len/2;
-                       break;
-               default:
-                       printf("Unexpecteded event code\n");
-                       continue;
+               if (!noevents) {
+                       read_size = fread(&dat,
+                                       1,
+                                       sizeof(struct iio_event_data),
+                                       fp_ev);
+                       switch (dat.id) {
+                       case IIO_EVENT_CODE_RING_100_FULL:
+                               toread = buf_len;
+                               break;
+                       case IIO_EVENT_CODE_RING_75_FULL:
+                               toread = buf_len*3/4;
+                               break;
+                       case IIO_EVENT_CODE_RING_50_FULL:
+                               toread = buf_len/2;
+                               break;
+                       default:
+                               printf("Unexpecteded event code\n");
+                               continue;
+                       }
+               } else {
+                       usleep(1000);
+                       toread = 64;
                }
+
                read_size = read(fp,
                                 data,
                                 toread*scan_size);