staging: iio: Add notrigger mode for generic_buffer

Some IIO devices do not use the triggers. This patch makes trigger setting
conditional so generic_buffer can be used when triggers are disabled.
Signed-off-by: Karol Wrona <k.wrona@samsung.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

drivers/staging/iio/Documentation/generic_buffer.c

@@ -158,11 +158,12 @@ int main(int argc, char **argv)
 	char *buffer_access;
 	int scan_size;
 	int noevents = 0;
+	int notrigger = 0;
 	char *dummy;
 
 	struct iio_channel_info *channels;
 
-	while ((c = getopt(argc, argv, "l:w:c:et:n:")) != -1) {
+	while ((c = getopt(argc, argv, "l:w:c:et:n:g")) != -1) {
 		switch (c) {
 		case 'n':
 			device_name = optarg;
@@ -183,6 +184,9 @@ int main(int argc, char **argv)
 		case 'l':
 			buf_len = strtoul(optarg, &dummy, 10);
 			break;
+		case 'g':
+			notrigger = 1;
+			break;
 		case '?':
 			return -1;
 		}
@@ -201,11 +205,13 @@ int main(int argc, char **argv)
 	printf("iio device number being used is %d\n", dev_num);
 
 	asprintf(&dev_dir_name, "%siio:device%d", iio_dir, dev_num);
+
+	if (!notrigger) {
 		if (trigger_name == NULL) {
 			/*
-		 * Build the trigger name. If it is device associated its
-		 * name is <device_name>_dev[n] where n matches the device
-		 * number found above
+			 * Build the trigger name. If it is device associated
+			 * its name is <device_name>_dev[n] where n matches
+			 * the device number found above.
 			 */
 			ret = asprintf(&trigger_name,
 				       "%s-dev%d", device_name, dev_num);
@@ -223,6 +229,8 @@ int main(int argc, char **argv)
 			goto error_free_triggername;
 		}
 		printf("iio trigger number being used is %d\n", trig_num);
+	} else
+		printf("trigger-less mode selected\n");
 
 	/*
 	 * Parse the files in scan_elements to identify what channels are
@@ -246,8 +254,11 @@ int main(int argc, char **argv)
 		ret = -ENOMEM;
 		goto error_free_triggername;
 	}
+
+	if (!notrigger) {
 		printf("%s %s\n", dev_dir_name, trigger_name);
-	/* Set the device trigger to be the data ready trigger found above */
+		/* Set the device trigger to be the data ready trigger found
+		 * above */
 		ret = write_sysfs_string_and_verify("trigger/current_trigger",
 						    dev_dir_name,
 						    trigger_name);
@@ -255,6 +266,7 @@ int main(int argc, char **argv)
 			printf("Failed to write current_trigger file\n");
 			goto error_free_buf_dir_name;
 		}
+	}
 
 	/* Setup ring buffer parameters */
 	ret = write_sysfs_int("length", buf_dir_name, buf_len);
@@ -323,6 +335,7 @@ int main(int argc, char **argv)
 	if (ret < 0)
 		goto error_close_buffer_access;
 
+	if (!notrigger)
 		/* Disconnect the trigger - just write a dummy name. */
 		write_sysfs_string("trigger/current_trigger",
 				   dev_dir_name, "NULL");