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path: root/drivers/staging/iio/Documentation/generic_buffer.c
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Diffstat (limited to 'drivers/staging/iio/Documentation/generic_buffer.c')
-rw-r--r--drivers/staging/iio/Documentation/generic_buffer.c71
1 files changed, 36 insertions, 35 deletions
diff --git a/drivers/staging/iio/Documentation/generic_buffer.c b/drivers/staging/iio/Documentation/generic_buffer.c
index bf553356fdad..827e92de8e30 100644
--- a/drivers/staging/iio/Documentation/generic_buffer.c
+++ b/drivers/staging/iio/Documentation/generic_buffer.c
@@ -18,6 +18,8 @@
*
*/
+#define _GNU_SOURCE
+
#include <unistd.h>
#include <dirent.h>
#include <fcntl.h>
@@ -29,12 +31,14 @@
#include <string.h>
#include <poll.h>
#include <endian.h>
+#include <getopt.h>
+#include <inttypes.h>
#include "iio_utils.h"
/**
* size_from_channelarray() - calculate the storage size of a scan
- * @channels: the channel info array
- * @num_channels: size of the channel info array
+ * @channels: the channel info array
+ * @num_channels: number of channels
*
* Has the side effect of filling the channels[i].location values used
* in processing the buffer output.
@@ -58,22 +62,22 @@ int size_from_channelarray(struct iio_channel_info *channels, int num_channels)
void print2byte(int input, struct iio_channel_info *info)
{
/* First swap if incorrect endian */
-
if (info->be)
input = be16toh((uint16_t)input);
else
input = le16toh((uint16_t)input);
- /* shift before conversion to avoid sign extension
- of left aligned data */
+ /*
+ * Shift before conversion to avoid sign extension
+ * of left aligned data
+ */
input = input >> info->shift;
if (info->is_signed) {
int16_t val = input;
val &= (1 << info->bits_used) - 1;
val = (int16_t)(val << (16 - info->bits_used)) >>
(16 - info->bits_used);
- printf("%05f ", val,
- (float)(val + info->offset)*info->scale);
+ printf("%05f ", ((float)val + info->offset)*info->scale);
} else {
uint16_t val = input;
val &= (1 << info->bits_used) - 1;
@@ -83,39 +87,39 @@ void print2byte(int input, struct iio_channel_info *info)
/**
* process_scan() - print out the values in SI units
* @data: pointer to the start of the scan
- * @infoarray: information about the channels. Note
+ * @channels: information about the channels. Note
* size_from_channelarray must have been called first to fill the
* location offsets.
- * @num_channels: the number of active channels
+ * @num_channels: number of channels
**/
void process_scan(char *data,
- struct iio_channel_info *infoarray,
+ struct iio_channel_info *channels,
int num_channels)
{
int k;
for (k = 0; k < num_channels; k++)
- switch (infoarray[k].bytes) {
+ switch (channels[k].bytes) {
/* only a few cases implemented so far */
case 2:
- print2byte(*(uint16_t *)(data + infoarray[k].location),
- &infoarray[k]);
+ print2byte(*(uint16_t *)(data + channels[k].location),
+ &channels[k]);
break;
case 8:
- if (infoarray[k].is_signed) {
+ if (channels[k].is_signed) {
int64_t val = *(int64_t *)
(data +
- infoarray[k].location);
- if ((val >> infoarray[k].bits_used) & 1)
- val = (val & infoarray[k].mask) |
- ~infoarray[k].mask;
+ channels[k].location);
+ if ((val >> channels[k].bits_used) & 1)
+ val = (val & channels[k].mask) |
+ ~channels[k].mask;
/* special case for timestamp */
- if (infoarray[k].scale == 1.0f &&
- infoarray[k].offset == 0.0f)
- printf(" %lld", val);
+ if (channels[k].scale == 1.0f &&
+ channels[k].offset == 0.0f)
+ printf("%" PRId64 " ", val);
else
printf("%05f ", ((float)val +
- infoarray[k].offset)*
- infoarray[k].scale);
+ channels[k].offset)*
+ channels[k].scale);
}
break;
default:
@@ -130,10 +134,7 @@ int main(int argc, char **argv)
unsigned long timedelay = 1000000;
unsigned long buf_len = 128;
-
int ret, c, i, j, toread;
-
- FILE *fp_ev;
int fp;
int num_channels;
@@ -149,7 +150,7 @@ int main(int argc, char **argv)
int noevents = 0;
char *dummy;
- struct iio_channel_info *infoarray;
+ struct iio_channel_info *channels;
while ((c = getopt(argc, argv, "l:w:c:et:n:")) != -1) {
switch (c) {
@@ -192,7 +193,7 @@ int main(int argc, char **argv)
asprintf(&dev_dir_name, "%siio:device%d", iio_dir, dev_num);
if (trigger_name == NULL) {
/*
- * Build the trigger name. If it is device associated it's
+ * Build the trigger name. If it is device associated its
* name is <device_name>_dev[n] where n matches the device
* number found above
*/
@@ -217,7 +218,7 @@ int main(int argc, char **argv)
* Parse the files in scan_elements to identify what channels are
* present
*/
- ret = build_channel_array(dev_dir_name, &infoarray, &num_channels);
+ ret = build_channel_array(dev_dir_name, &channels, &num_channels);
if (ret) {
printf("Problem reading scan element information\n");
printf("diag %s\n", dev_dir_name);
@@ -236,7 +237,7 @@ int main(int argc, char **argv)
goto error_free_triggername;
}
printf("%s %s\n", dev_dir_name, trigger_name);
- /* Set the device trigger to be the data rdy 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);
@@ -254,7 +255,7 @@ int main(int argc, char **argv)
ret = write_sysfs_int("enable", buf_dir_name, 1);
if (ret < 0)
goto error_free_buf_dir_name;
- scan_size = size_from_channelarray(infoarray, num_channels);
+ scan_size = size_from_channelarray(channels, num_channels);
data = malloc(scan_size*buf_len);
if (!data) {
ret = -ENOMEM;
@@ -269,7 +270,7 @@ int main(int argc, char **argv)
/* Attempt to open non blocking the access dev */
fp = open(buffer_access, O_RDONLY | O_NONBLOCK);
- if (fp == -1) { /*If it isn't there make the node */
+ if (fp == -1) { /* If it isn't there make the node */
printf("Failed to open %s\n", buffer_access);
ret = -errno;
goto error_free_buffer_access;
@@ -300,16 +301,16 @@ int main(int argc, char **argv)
}
for (i = 0; i < read_size/scan_size; i++)
process_scan(data + scan_size*i,
- infoarray,
+ channels,
num_channels);
}
- /* Stop the ring buffer */
+ /* Stop the buffer */
ret = write_sysfs_int("enable", buf_dir_name, 0);
if (ret < 0)
goto error_close_buffer_access;
- /* Disconnect from the trigger - just write a dummy name.*/
+ /* Disconnect the trigger - just write a dummy name. */
write_sysfs_string("trigger/current_trigger",
dev_dir_name, "NULL");
generated by cgit v1.2.3 (git 2.0.4) at 2024-05-24 18:17:55 +0000