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iio: tools: generic_buffer: auto-enable channels 

If no channels are enabled when we run generic_buffer on a
device, add a command-line option to just enable all of them,
run the sampling and disable them all again afterwards.

This is extremely useful when I'm low-level testing my
sensors with interrupts and triggers, sample session:

root@Ux500:/ lsiio
Device 000: lsm303dlh_accel
Device 001: lis331dl_accel
Device 002: l3g4200d
Device 003: lsm303dlh_magn
Device 004: lps001wp
Trigger 000: lsm303dlh_accel-trigger
Trigger 001: lis331dl_accel-trigger
Trigger 002: l3g4200d-trigger

root@Ux500:/ generic_buffer -a -c 10 -n l3g4200d
iio device number being used is 2
iio trigger number being used is 2
No channels are enabled, enabling all channels
Enabling: in_anglvel_x_en
Enabling: in_anglvel_y_en
Enabling: in_anglvel_z_en
Enabling: in_timestamp_en
/sys/bus/iio/devices/iio:device2 l3g4200d-trigger
-3.593664 -0.713133 4.870143 946684863662292480
3.225546 0.867357 -4.945878 946684863671875000
-0.676413 0.127296 0.106641 946684863681488037
-0.661113 0.110160 0.128826 946684863690673828
-0.664173 0.113067 0.123471 946684863700683593
-0.664938 0.109395 0.124848 946684863710144042
-0.664173 0.110619 0.130203 946684863719512939
-0.666162 0.111231 0.132651 946684863729125976
-0.668610 0.111690 0.130662 946684863738739013
-0.660501 0.110466 0.131733 946684863748565673
Disabling: in_anglvel_x_en
Disabling: in_anglvel_y_en
Disabling: in_anglvel_z_en
Disabling: in_timestamp_en

Pure awesomeness. If some channels have been enabled through
scripts or manual interaction, nothing happens.

Cc: Peter Meerwald-Stadler <pmeerw@pmeerw.net>
Acked-by: Daniel Baluta <daniel.baluta@intel.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Linus Walleij 2016-04-14 10:26:47 +02:00 committed by Jonathan Cameron
parent 0e6f6871a1
commit 5f991a921a
2 changed files with 105 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

102
tools/iio/generic_buffer.c
View File

@ -34,6 +34,15 @@
#include <inttypes.h>
#include "iio_utils.h"
/**
* enum autochan - state for the automatic channel enabling mechanism
*/
enum autochan {
AUTOCHANNELS_DISABLED,
AUTOCHANNELS_ENABLED,
AUTOCHANNELS_ACTIVE,
};
/**
* size_from_channelarray() - calculate the storage size of a scan
* @channels: the channel info array
@ -191,10 +200,51 @@ void process_scan(char *data,
printf("\n");
}
static int enable_disable_all_channels(char *dev_dir_name, int enable)
{
const struct dirent *ent;
char scanelemdir[256];
DIR *dp;
int ret;
snprintf(scanelemdir, sizeof(scanelemdir),
FORMAT_SCAN_ELEMENTS_DIR, dev_dir_name);
scanelemdir[sizeof(scanelemdir)-1] = '\0';
dp = opendir(scanelemdir);
if (!dp) {
fprintf(stderr, "Enabling/disabling channels: can't open %s\n",
scanelemdir);
return -EIO;
}
ret = -ENOENT;
while (ent = readdir(dp), ent) {
if (iioutils_check_suffix(ent->d_name, "_en")) {
printf("%sabling: %s\n",
enable ? "En" : "Dis",
ent->d_name);
ret = write_sysfs_int(ent->d_name, scanelemdir,
enable);
if (ret < 0)
fprintf(stderr, "Failed to enable/disable %s\n",
ent->d_name);
}
}
if (closedir(dp) == -1) {
perror("Enabling/disabling channels: "
"Failed to close directory");
return -errno;
}
return 0;
}
void print_usage(void)
{
fprintf(stderr, "Usage: generic_buffer [options]...\n"
"Capture, convert and output data from IIO device buffer\n"
" -a Auto-activate all available channels\n"
" -c <n> Do n conversions\n"
" -e Disable wait for event (new data)\n"
" -g Use trigger-less mode\n"
@ -225,12 +275,16 @@ int main(int argc, char **argv)
int scan_size;
int noevents = 0;
int notrigger = 0;
enum autochan autochannels = AUTOCHANNELS_DISABLED;
char *dummy;
struct iio_channel_info *channels;
while ((c = getopt(argc, argv, "c:egl:n:t:w:")) != -1) {
while ((c = getopt(argc, argv, "ac:egl:n:t:w:")) != -1) {
switch (c) {
case 'a':
autochannels = AUTOCHANNELS_ENABLED;
break;
case 'c':
errno = 0;
num_loops = strtoul(optarg, &dummy, 10);
@ -340,12 +394,47 @@ int main(int argc, char **argv)
"diag %s\n", dev_dir_name);
goto error_free_triggername;
}
if (!num_channels) {
if (num_channels && autochannels == AUTOCHANNELS_ENABLED) {
fprintf(stderr, "Auto-channels selected but some channels "
"are already activated in sysfs\n");
fprintf(stderr, "Proceeding without activating any channels\n");
}
if (!num_channels && autochannels == AUTOCHANNELS_ENABLED) {
fprintf(stderr,
"No channels are enabled, enabling all channels\n");
ret = enable_disable_all_channels(dev_dir_name, 1);
if (ret) {
fprintf(stderr, "Failed to enable all channels\n");
goto error_free_triggername;
}
/* This flags that we need to disable the channels again */
autochannels = AUTOCHANNELS_ACTIVE;
ret = build_channel_array(dev_dir_name, &channels,
&num_channels);
if (ret) {
fprintf(stderr, "Problem reading scan element "
"information\n"
"diag %s\n", dev_dir_name);
goto error_disable_channels;
}
if (!num_channels) {
fprintf(stderr, "Still no channels after "
"auto-enabling, giving up\n");
goto error_disable_channels;
}
}
if (!num_channels && autochannels == AUTOCHANNELS_DISABLED) {
fprintf(stderr,
"No channels are enabled, we have nothing to scan.\n");
fprintf(stderr, "Enable channels manually in "
FORMAT_SCAN_ELEMENTS_DIR
"/*_en and try again.\n", dev_dir_name);
"/*_en or pass -a to autoenable channels and "
"try again.\n", dev_dir_name);
ret = -ENOENT;
goto error_free_triggername;
}
@ -479,7 +568,12 @@ int main(int argc, char **argv)
error_free_triggername:
if (datardytrigger)
free(trigger_name);
error_disable_channels:
if (autochannels == AUTOCHANNELS_ACTIVE) {
ret = enable_disable_all_channels(dev_dir_name, 0);
if (ret)
fprintf(stderr, "Failed to disable all channels\n");
}
error_free_dev_dir_name:
free(dev_dir_name);

7
tools/iio/iio_utils.h
View File

@ -52,6 +52,13 @@ struct iio_channel_info {
unsigned location;
};
static inline int iioutils_check_suffix(const char *str, const char *suffix)
{
return strlen(str) >= strlen(suffix) &&
strncmp(str+strlen(str)-strlen(suffix),
suffix, strlen(suffix)) == 0;
}
int iioutils_break_up_name(const char *full_name, char **generic_name);
int iioutils_get_type(unsigned *is_signed, unsigned *bytes, unsigned *bits_used,
unsigned *shift, uint64_t *mask, unsigned *be,