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staging: iio: Add notrigger mode for generic_buffer

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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>
This commit is contained in:
Karol Wrona 2014-11-04 15:29:39 +01:00 • committed by Jonathan Cameron
parent 455f0049e0
commit b6d5be5702
1 changed files with 46 additions and 33 deletions
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23
drivers/staging/iio/Documentation/generic_buffer.c
View file

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