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
Jonathan Cameron
Родитель
0e6f6871a1
Коммит
5f991a921a
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@ -34,6 +34,15 @@
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#include <inttypes.h>
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#include "iio_utils.h"
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/**
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* enum autochan - state for the automatic channel enabling mechanism
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*/
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enum autochan {
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AUTOCHANNELS_DISABLED,
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AUTOCHANNELS_ENABLED,
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AUTOCHANNELS_ACTIVE,
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};
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/**
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* size_from_channelarray() - calculate the storage size of a scan
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* @channels: the channel info array
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@ -191,10 +200,51 @@ void process_scan(char *data,
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printf("\n");
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}
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static int enable_disable_all_channels(char *dev_dir_name, int enable)
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{
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const struct dirent *ent;
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char scanelemdir[256];
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DIR *dp;
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int ret;
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snprintf(scanelemdir, sizeof(scanelemdir),
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FORMAT_SCAN_ELEMENTS_DIR, dev_dir_name);
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scanelemdir[sizeof(scanelemdir)-1] = '\0';
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dp = opendir(scanelemdir);
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if (!dp) {
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fprintf(stderr, "Enabling/disabling channels: can't open %s\n",
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scanelemdir);
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return -EIO;
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}
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ret = -ENOENT;
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while (ent = readdir(dp), ent) {
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if (iioutils_check_suffix(ent->d_name, "_en")) {
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printf("%sabling: %s\n",
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enable ? "En" : "Dis",
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ent->d_name);
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ret = write_sysfs_int(ent->d_name, scanelemdir,
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enable);
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if (ret < 0)
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fprintf(stderr, "Failed to enable/disable %s\n",
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ent->d_name);
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}
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}
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if (closedir(dp) == -1) {
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perror("Enabling/disabling channels: "
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"Failed to close directory");
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return -errno;
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}
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return 0;
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}
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void print_usage(void)
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{
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fprintf(stderr, "Usage: generic_buffer [options]...\n"
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"Capture, convert and output data from IIO device buffer\n"
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" -a Auto-activate all available channels\n"
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" -c <n> Do n conversions\n"
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" -e Disable wait for event (new data)\n"
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" -g Use trigger-less mode\n"
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@ -225,12 +275,16 @@ int main(int argc, char **argv)
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int scan_size;
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int noevents = 0;
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int notrigger = 0;
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enum autochan autochannels = AUTOCHANNELS_DISABLED;
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char *dummy;
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struct iio_channel_info *channels;
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while ((c = getopt(argc, argv, "c:egl:n:t:w:")) != -1) {
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while ((c = getopt(argc, argv, "ac:egl:n:t:w:")) != -1) {
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switch (c) {
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case 'a':
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autochannels = AUTOCHANNELS_ENABLED;
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break;
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case 'c':
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errno = 0;
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num_loops = strtoul(optarg, &dummy, 10);
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@ -340,12 +394,47 @@ int main(int argc, char **argv)
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"diag %s\n", dev_dir_name);
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goto error_free_triggername;
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}
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if (!num_channels) {
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if (num_channels && autochannels == AUTOCHANNELS_ENABLED) {
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fprintf(stderr, "Auto-channels selected but some channels "
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"are already activated in sysfs\n");
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fprintf(stderr, "Proceeding without activating any channels\n");
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}
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if (!num_channels && autochannels == AUTOCHANNELS_ENABLED) {
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fprintf(stderr,
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"No channels are enabled, enabling all channels\n");
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ret = enable_disable_all_channels(dev_dir_name, 1);
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if (ret) {
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fprintf(stderr, "Failed to enable all channels\n");
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goto error_free_triggername;
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}
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/* This flags that we need to disable the channels again */
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autochannels = AUTOCHANNELS_ACTIVE;
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ret = build_channel_array(dev_dir_name, &channels,
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&num_channels);
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if (ret) {
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fprintf(stderr, "Problem reading scan element "
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"information\n"
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"diag %s\n", dev_dir_name);
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goto error_disable_channels;
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}
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if (!num_channels) {
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fprintf(stderr, "Still no channels after "
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"auto-enabling, giving up\n");
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goto error_disable_channels;
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}
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}
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if (!num_channels && autochannels == AUTOCHANNELS_DISABLED) {
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fprintf(stderr,
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"No channels are enabled, we have nothing to scan.\n");
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fprintf(stderr, "Enable channels manually in "
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FORMAT_SCAN_ELEMENTS_DIR
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"/*_en and try again.\n", dev_dir_name);
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"/*_en or pass -a to autoenable channels and "
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"try again.\n", dev_dir_name);
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ret = -ENOENT;
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goto error_free_triggername;
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}
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@ -479,7 +568,12 @@ error_free_channels:
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error_free_triggername:
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if (datardytrigger)
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free(trigger_name);
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error_disable_channels:
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if (autochannels == AUTOCHANNELS_ACTIVE) {
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ret = enable_disable_all_channels(dev_dir_name, 0);
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if (ret)
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fprintf(stderr, "Failed to disable all channels\n");
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}
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error_free_dev_dir_name:
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free(dev_dir_name);
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@ -52,6 +52,13 @@ struct iio_channel_info {
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unsigned location;
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};
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static inline int iioutils_check_suffix(const char *str, const char *suffix)
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{
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return strlen(str) >= strlen(suffix) &&
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strncmp(str+strlen(str)-strlen(suffix),
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suffix, strlen(suffix)) == 0;
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}
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int iioutils_break_up_name(const char *full_name, char **generic_name);
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int iioutils_get_type(unsigned *is_signed, unsigned *bytes, unsigned *bits_used,
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unsigned *shift, uint64_t *mask, unsigned *be,
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