staging:iio:Documentation: Rewrite example for new abi.
Signed-off-by: Jonathan Cameron <jic23@cam.ac.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Jonathan Cameron
Greg Kroah-Hartman
parent
e9124afad3
commit
9d8ae6c884
@ -7,140 +7,173 @@
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* the Free Software Foundation.
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*/
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/* Made up value to limit allocation sizes */
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#include <string.h>
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#include <stdlib.h>
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#define IIO_MAX_NAME_LENGTH 30
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#define IIO_EVENT_CODE_RING_50_FULL 200
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#define IIO_EVENT_CODE_RING_75_FULL 201
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#define IIO_EVENT_CODE_RING_100_FULL 202
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const char *iio_dir = "/sys/bus/iio/devices/";
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struct iio_event_data {
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int id;
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__s64 timestamp;
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};
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inline char *find_ring_subelement(const char *directory, const char *subelement)
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/**
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* find_type_by_name() - function to match top level types by name
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* @name: top level type instance name
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* @type: the type of top level instance being sort
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*
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* Typical types this is used for are device and trigger.
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**/
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inline int find_type_by_name(const char *name, const char *type)
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{
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DIR *dp;
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const struct dirent *ent;
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int pos;
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char temp[100];
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char *returnstring;
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dp = opendir(directory);
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if (dp == NULL) {
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printf("could not directory: %s\n", directory);
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return NULL;
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}
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while (ent = readdir(dp), ent != NULL) {
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if (strcmp(ent->d_name, ".") != 0 &&
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strcmp(ent->d_name, "..") != 0) {
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if (strncmp(ent->d_name, subelement, strlen(subelement)) == 0) {
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int length = sprintf(temp, "%s%s%s", directory, ent->d_name, "/");
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returnstring = malloc(length+1);
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strncpy(returnstring, temp, length+1);
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return returnstring;
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}
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}
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}
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return 0;
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}
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char *find_type_by_name(const char *name, const char *type)
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{
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const char *iio_dir = "/sys/bus/iio/devices/";
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const struct dirent *ent;
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int cnt, pos, pos2;
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int number, numstrlen;
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FILE *nameFile;
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DIR *dp;
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char thisname[100];
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char temp[100];
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char *returnstring = NULL;
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char thisname[IIO_MAX_NAME_LENGTH];
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char *filename;
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struct stat Stat;
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pos = sprintf(temp, "%s", iio_dir);
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dp = opendir(iio_dir);
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if (dp == NULL) {
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printf("No industrialio devices available");
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return NULL;
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return -ENODEV;
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}
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while (ent = readdir(dp), ent != NULL) {
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cnt++;
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/*reject . and .. */
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if (strcmp(ent->d_name, ".") != 0 &&
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strcmp(ent->d_name, "..") != 0) {
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/*make sure it isn't a trigger!*/
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if (strncmp(ent->d_name, type, strlen(type)) == 0) {
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/* build full path to new file */
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pos2 = pos + sprintf(temp + pos, "%s/", ent->d_name);
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sprintf(temp + pos2, "name");
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printf("search location %s\n", temp);
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nameFile = fopen(temp, "r");
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if (!nameFile) {
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sprintf(temp + pos2, "modalias", ent->d_name);
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nameFile = fopen(temp, "r");
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if (!nameFile) {
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printf("Failed to find a name for device\n");
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return NULL;
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}
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}
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fscanf(nameFile, "%s", thisname);
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if (strcmp(name, thisname) == 0) {
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returnstring = malloc(strlen(temp) + 1);
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sprintf(temp + pos2, "");
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strcpy(returnstring, temp);
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return returnstring;
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}
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fclose(nameFile);
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while (ent = readdir(dp), ent != NULL) {
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if (strcmp(ent->d_name, ".") != 0 &&
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strcmp(ent->d_name, "..") != 0 &&
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strlen(ent->d_name) > strlen(type) &&
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strncmp(ent->d_name, type, strlen(type)) == 0) {
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numstrlen = sscanf(ent->d_name + strlen(type),
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"%d",
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&number);
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/* verify the next character is not a colon */
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if (strncmp(ent->d_name + strlen(type) + numstrlen,
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":",
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1) != 0) {
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filename = malloc(strlen(iio_dir)
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+ strlen(type)
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+ 1
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+ numstrlen
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+ 1);
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if (filename == NULL)
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return -ENOMEM;
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sprintf(filename, "%s%s%d/name",
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iio_dir,
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type,
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number);
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nameFile = fopen(filename, "r");
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if (!nameFile)
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continue;
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free(filename);
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fscanf(nameFile, "%s", thisname);
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if (strcmp(name, thisname) == 0)
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return number;
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fclose(nameFile);
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}
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}
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}
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return -ENODEV;
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}
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inline int _write_sysfs_int(char *filename, char *basedir, int val, int verify)
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{
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int ret;
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FILE *sysfsfp;
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int test;
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char *temp = malloc(strlen(basedir) + strlen(filename) + 2);
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if (temp == NULL)
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return -ENOMEM;
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sprintf(temp, "%s/%s", basedir, filename);
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sysfsfp = fopen(temp, "w");
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if (sysfsfp == NULL) {
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printf("failed to open %s\n", temp);
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ret = -errno;
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goto error_free;
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}
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fprintf(sysfsfp, "%d", val);
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fclose(sysfsfp);
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if (verify) {
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sysfsfp = fopen(temp, "r");
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if (sysfsfp == NULL) {
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printf("failed to open %s\n", temp);
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ret = -errno;
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goto error_free;
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}
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fscanf(sysfsfp, "%d", &test);
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if (test != val) {
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printf("Possible failure in int write %d to %s%s\n",
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val,
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basedir,
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filename);
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ret = -1;
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}
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}
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error_free:
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free(temp);
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return ret;
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}
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int write_sysfs_int(char *filename, char *basedir, int val)
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{
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int ret;
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FILE *sysfsfp;
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char temp[100];
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sprintf(temp, "%s%s", basedir, filename);
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sysfsfp = fopen(temp, "w");
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if (sysfsfp == NULL)
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return -1;
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fprintf(sysfsfp, "%d", val);
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fclose(sysfsfp);
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return 0;
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return _write_sysfs_int(filename, basedir, val, 0);
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}
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int write_sysfs_int_and_verify(char *filename, char *basedir, int val)
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{
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int ret;
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FILE *sysfsfp;
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char temp[100];
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int test;
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sprintf(temp, "%s%s", basedir, filename);
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sysfsfp = fopen(temp, "w");
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if (sysfsfp == NULL)
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return -1;
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fprintf(sysfsfp, "%d", val);
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fclose(sysfsfp);
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sysfsfp = fopen(temp, "r");
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if (sysfsfp == NULL)
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return -1;
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fscanf(sysfsfp, "%d", &test);
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if (test != val) {
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printf("Possible failure in int write %d to %s%s\n",
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val,
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basedir,
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filename);
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return -1;
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}
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return 0;
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return _write_sysfs_int(filename, basedir, val, 1);
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}
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int _write_sysfs_string(char *filename, char *basedir, char *val, int verify)
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{
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int ret;
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FILE *sysfsfp;
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char *temp = malloc(strlen(basedir) + strlen(filename) + 2);
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if (temp == NULL) {
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printf("Memory allocation failed\n");
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return -ENOMEM;
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}
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sprintf(temp, "%s/%s", basedir, filename);
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sysfsfp = fopen(temp, "w");
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if (sysfsfp == NULL) {
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printf("Could not open %s\n", temp);
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ret = -errno;
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goto error_free;
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}
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fprintf(sysfsfp, "%s", val);
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fclose(sysfsfp);
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if (verify) {
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sysfsfp = fopen(temp, "r");
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if (sysfsfp == NULL) {
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ret = -errno;
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goto error_free;
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}
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fscanf(sysfsfp, "%s", temp);
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if (strcmp(temp, val) != 0) {
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printf("Possible failure in string write of %s "
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"Should be %s "
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"writen to %s\%s\n",
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temp,
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val,
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basedir,
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filename);
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ret = -1;
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}
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}
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error_free:
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free(temp);
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return ret;
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}
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/**
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* write_sysfs_string_and_verify() - string write, readback and verify
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* @filename: name of file to write to
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@ -149,40 +182,54 @@ int write_sysfs_int_and_verify(char *filename, char *basedir, int val)
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**/
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int write_sysfs_string_and_verify(char *filename, char *basedir, char *val)
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{
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int ret;
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FILE *sysfsfp;
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char temp[100];
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sprintf(temp, "%s%s", basedir, filename);
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sysfsfp = fopen(temp, "w");
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if (sysfsfp == NULL)
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return -1;
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fprintf(sysfsfp, "%s", val);
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fclose(sysfsfp);
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return _write_sysfs_string(filename, basedir, val, 1);
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}
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sysfsfp = fopen(temp, "r");
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if (sysfsfp == NULL)
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return -1;
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fscanf(sysfsfp, "%s", temp);
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if (strcmp(temp, val) != 0) {
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printf("Possible failure in string write %s to %s%s \n",
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val,
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basedir,
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filename);
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return -1;
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}
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return 0;
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int write_sysfs_string(char *filename, char *basedir, char *val)
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{
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return _write_sysfs_string(filename, basedir, val, 0);
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}
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int read_sysfs_posint(char *filename, char *basedir)
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{
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int ret;
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FILE *sysfsfp;
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char temp[100];
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sprintf(temp, "%s%s", basedir, filename);
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char *temp = malloc(strlen(basedir) + strlen(filename) + 2);
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if (temp == NULL) {
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printf("Memory allocation failed");
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return -ENOMEM;
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}
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sprintf(temp, "%s/%s", basedir, filename);
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sysfsfp = fopen(temp, "r");
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if (sysfsfp == NULL)
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return -1;
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if (sysfsfp == NULL) {
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ret = -errno;
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goto error_free;
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}
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fscanf(sysfsfp, "%d\n", &ret);
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fclose(sysfsfp);
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error_free:
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free(temp);
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return ret;
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}
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int read_sysfs_float(char *filename, char *basedir, float *val)
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{
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float ret = 0;
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FILE *sysfsfp;
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char *temp = malloc(strlen(basedir) + strlen(filename) + 2);
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if (temp == NULL) {
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printf("Memory allocation failed");
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return -ENOMEM;
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}
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sprintf(temp, "%s/%s", basedir, filename);
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sysfsfp = fopen(temp, "r");
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if (sysfsfp == NULL) {
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ret = -errno;
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goto error_free;
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}
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fscanf(sysfsfp, "%f\n", val);
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fclose(sysfsfp);
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error_free:
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free(temp);
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return ret;
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}
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@ -1,4 +1,4 @@
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/* Industrialio test ring buffer with a lis3l02dq acceleromter
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/* Industrialio ring buffer with a lis3l02dq accelerometer
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*
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* Copyright (c) 2008 Jonathan Cameron
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*
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@ -6,125 +6,181 @@
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* under the terms of the GNU General Public License version 2 as published by
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* the Free Software Foundation.
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*
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* Assumes suitable udev rules are used to create the dev nodes as named here.
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* This program is primarily intended as an example application.
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*/
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#include <dirent.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <errno.h>
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#include <stdint.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/dir.h>
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#include <linux/types.h>
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#include "iio_utils.h"
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static const char *ring_access = "/dev/iio/lis3l02dq_ring_access";
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static const char *ring_event = "/dev/iio/lis3l02dq_ring_event";
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static const char *device_name = "lis3l02dq";
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static const char *trigger_name = "lis3l02dq-dev0";
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static int NumVals = 3;
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static int scan_ts = 1;
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static int RingLength = 128;
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const char *device_name = "lis3l02dq";
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const char *trigger_name_base = "lis3l02dq-dev";
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const int num_vals = 3;
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const int scan_ts = 1;
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const int buf_len = 128;
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const int num_loops = 10;
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/*
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* Could get this from ring bps, but only after starting the ring
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* which is a bit late for it to be useful
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* which is a bit late for it to be useful.
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*
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* Todo: replace with much more generic version based on scan_elements
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* directory.
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*/
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int size_from_scanmode(int numVals, int timestamp)
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int size_from_scanmode(int num_vals, int timestamp)
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{
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if (numVals && timestamp)
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if (num_vals && timestamp)
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return 16;
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else if (timestamp)
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return 8;
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else
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return numVals*2;
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return num_vals*2;
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}
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int main(int argc, char **argv)
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{
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int ret;
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int i, j, k, toread;
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FILE *fp_ev;
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int fp;
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char *trigger_name, *dev_dir_name, *buf_dir_name;
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char *data;
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size_t read_size;
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struct iio_event_data dat;
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int dev_num, trig_num;
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char *BaseDirectoryName,
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*TriggerDirectoryName,
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*RingBufferDirectoryName;
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char *buffer_access, *buffer_event;
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const char *iio_dir = "/sys/bus/iio/devices/";
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int scan_size;
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float gain = 1;
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BaseDirectoryName = find_type_by_name(device_name, "device");
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if (BaseDirectoryName == NULL) {
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printf("Failed to find the %s \n", device_name);
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return -1;
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/* Find out which iio device is the accelerometer. */
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dev_num = find_type_by_name(device_name, "device");
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if (dev_num < 0) {
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printf("Failed to find the %s\n", device_name);
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ret = -ENODEV;
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goto error_ret;
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}
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TriggerDirectoryName = find_type_by_name(trigger_name, "trigger");
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if (TriggerDirectoryName == NULL) {
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printf("iio device number being used is %d\n", dev_num);
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asprintf(&dev_dir_name, "%sdevice%d", iio_dir, dev_num);
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/*
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* Build the trigger name.
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* In this case we want the lis3l02dq's data ready trigger
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* for this lis3l02dq. The naming is lis3l02dq_dev[n], where
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* n matches the device number found above.
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*/
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ret = asprintf(&trigger_name, "%s%d", trigger_name_base, dev_num);
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if (ret < 0) {
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ret = -ENOMEM;
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goto error_free_dev_dir_name;
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}
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/*
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* Find the trigger by name.
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* This is techically unecessary here as we only need to
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* refer to the trigger by name and that name is already
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* known.
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*/
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trig_num = find_type_by_name(trigger_name, "trigger");
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if (trig_num < 0) {
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printf("Failed to find the %s\n", trigger_name);
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return -1;
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}
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RingBufferDirectoryName = find_ring_subelement(BaseDirectoryName,
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"ring_buffer");
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if (RingBufferDirectoryName == NULL) {
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printf("Failed to find ring buffer\n");
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return -1;
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ret = -ENODEV;
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goto error_free_triggername;
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}
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printf("iio trigger number being used is %d\n", trig_num);
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|
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if (write_sysfs_string_and_verify("trigger/current_trigger",
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BaseDirectoryName,
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(char *)trigger_name) < 0) {
|
||||
printf("Failed to write current_trigger file \n");
|
||||
return -1;
|
||||
/*
|
||||
* Read in the scale value - in a more generic case, first
|
||||
* check for accel_scale, then the indivual channel scales
|
||||
*/
|
||||
ret = read_sysfs_float("accel_scale", dev_dir_name, &gain);
|
||||
if (ret)
|
||||
goto error_free_triggername;;
|
||||
|
||||
/*
|
||||
* Construct the directory name for the associated buffer.
|
||||
* As we know that the lis3l02dq has only one buffer this may
|
||||
* be built rather than found.
|
||||
*/
|
||||
ret = asprintf(&buf_dir_name, "%sdevice%d:buffer0", iio_dir, dev_num);
|
||||
if (ret < 0) {
|
||||
ret = -ENOMEM;
|
||||
goto error_free_triggername;
|
||||
}
|
||||
/* Set the device trigger to be the data rdy trigger found above */
|
||||
ret = write_sysfs_string_and_verify("trigger/current_trigger",
|
||||
dev_dir_name,
|
||||
trigger_name);
|
||||
if (ret < 0) {
|
||||
printf("Failed to write current_trigger file\n");
|
||||
goto error_free_buf_dir_name;
|
||||
}
|
||||
|
||||
/* Setup ring buffer parameters */
|
||||
if (write_sysfs_int("length", RingBufferDirectoryName,
|
||||
RingLength) < 0) {
|
||||
printf("Failed to open the ring buffer length file \n");
|
||||
return -1;
|
||||
}
|
||||
ret = write_sysfs_int("length", buf_dir_name, buf_len);
|
||||
if (ret < 0)
|
||||
goto error_free_buf_dir_name;
|
||||
|
||||
/* Enable the ring buffer */
|
||||
if (write_sysfs_int("ring_enable", RingBufferDirectoryName, 1) < 0) {
|
||||
printf("Failed to open the ring buffer control file \n");
|
||||
return -1;
|
||||
};
|
||||
/* Enable the buffer */
|
||||
ret = write_sysfs_int("ring_enable", buf_dir_name, 1);
|
||||
if (ret < 0)
|
||||
goto error_free_buf_dir_name;
|
||||
|
||||
data = malloc(size_from_scanmode(NumVals, scan_ts)*RingLength);
|
||||
data = malloc(size_from_scanmode(num_vals, scan_ts)*buf_len);
|
||||
if (!data) {
|
||||
printf("Could not allocate space for usespace data store\n");
|
||||
return -1;
|
||||
ret = -ENOMEM;
|
||||
goto error_free_buf_dir_name;
|
||||
}
|
||||
|
||||
ret = asprintf(&buffer_access,
|
||||
"/dev/device%d:buffer0:access0",
|
||||
dev_num);
|
||||
if (ret < 0) {
|
||||
ret = -ENOMEM;
|
||||
goto error_free_data;
|
||||
}
|
||||
|
||||
ret = asprintf(&buffer_event, "/dev/device%d:buffer0:event0", dev_num);
|
||||
if (ret < 0) {
|
||||
ret = -ENOMEM;
|
||||
goto error_free_data;
|
||||
}
|
||||
/* Attempt to open non blocking the access dev */
|
||||
fp = open(ring_access, O_RDONLY | O_NONBLOCK);
|
||||
fp = open(buffer_access, O_RDONLY | O_NONBLOCK);
|
||||
if (fp == -1) { /*If it isn't there make the node */
|
||||
printf("Failed to open %s\n", ring_access);
|
||||
return -1;
|
||||
printf("Failed to open %s\n", buffer_access);
|
||||
ret = -errno;
|
||||
goto error_free_buffer_event;
|
||||
}
|
||||
/* Attempt to open the event access dev (blocking this time) */
|
||||
fp_ev = fopen(ring_event, "rb");
|
||||
fp_ev = fopen(buffer_event, "rb");
|
||||
if (fp_ev == NULL) {
|
||||
printf("Failed to open %s\n", ring_event);
|
||||
return -1;
|
||||
printf("Failed to open %s\n", buffer_event);
|
||||
ret = -errno;
|
||||
goto error_close_buffer_access;
|
||||
}
|
||||
|
||||
/* Wait for events 10 times */
|
||||
for (j = 0; j < 10; j++) {
|
||||
for (j = 0; j < num_loops; j++) {
|
||||
read_size = fread(&dat, 1, sizeof(struct iio_event_data),
|
||||
fp_ev);
|
||||
switch (dat.id) {
|
||||
case IIO_EVENT_CODE_RING_100_FULL:
|
||||
toread = RingLength;
|
||||
toread = buf_len;
|
||||
break;
|
||||
case IIO_EVENT_CODE_RING_75_FULL:
|
||||
toread = RingLength*3/4;
|
||||
toread = buf_len*3/4;
|
||||
break;
|
||||
case IIO_EVENT_CODE_RING_50_FULL:
|
||||
toread = RingLength/2;
|
||||
toread = buf_len/2;
|
||||
break;
|
||||
default:
|
||||
printf("Unexpecteded event code\n");
|
||||
@ -132,39 +188,51 @@ int main(int argc, char **argv)
|
||||
}
|
||||
read_size = read(fp,
|
||||
data,
|
||||
toread*size_from_scanmode(NumVals, scan_ts));
|
||||
toread*size_from_scanmode(num_vals, scan_ts));
|
||||
if (read_size == -EAGAIN) {
|
||||
printf("nothing available \n");
|
||||
printf("nothing available\n");
|
||||
continue;
|
||||
}
|
||||
|
||||
for (i = 0;
|
||||
i < read_size/size_from_scanmode(NumVals, scan_ts);
|
||||
i++) {
|
||||
for (k = 0; k < NumVals; k++) {
|
||||
__s16 val = *(__s16 *)(&data[i*size_from_scanmode(NumVals, scan_ts)
|
||||
scan_size = size_from_scanmode(num_vals, scan_ts);
|
||||
for (i = 0; i < read_size/scan_size; i++) {
|
||||
for (k = 0; k < num_vals; k++) {
|
||||
__s16 val = *(__s16 *)(&data[i*scan_size
|
||||
+ (k)*2]);
|
||||
printf("%05d ", val);
|
||||
printf("%05f ", (float)val*gain);
|
||||
}
|
||||
printf(" %lld\n",
|
||||
*(__s64 *)(&data[(i+1)*size_from_scanmode(NumVals, scan_ts)
|
||||
*(__s64 *)(&data[(i + 1)
|
||||
*size_from_scanmode(num_vals,
|
||||
scan_ts)
|
||||
- sizeof(__s64)]));
|
||||
}
|
||||
}
|
||||
|
||||
/* Stop the ring buffer */
|
||||
if (write_sysfs_int("ring_enable", RingBufferDirectoryName, 0) < 0) {
|
||||
printf("Failed to open the ring buffer control file \n");
|
||||
return -1;
|
||||
};
|
||||
ret = write_sysfs_int("ring_enable", buf_dir_name, 0);
|
||||
if (ret < 0)
|
||||
goto error_close_buffer_event;
|
||||
|
||||
/* Disconnect from the trigger - writing something that doesn't exist.*/
|
||||
write_sysfs_string_and_verify("trigger/current_trigger",
|
||||
BaseDirectoryName, "NULL");
|
||||
free(BaseDirectoryName);
|
||||
free(TriggerDirectoryName);
|
||||
free(RingBufferDirectoryName);
|
||||
/* Disconnect from the trigger - just write a dummy name.*/
|
||||
write_sysfs_string("trigger/current_trigger",
|
||||
dev_dir_name, "NULL");
|
||||
|
||||
error_close_buffer_event:
|
||||
fclose(fp_ev);
|
||||
error_close_buffer_access:
|
||||
close(fp);
|
||||
error_free_data:
|
||||
free(data);
|
||||
|
||||
return 0;
|
||||
error_free_buffer_access:
|
||||
free(buffer_access);
|
||||
error_free_buffer_event:
|
||||
free(buffer_event);
|
||||
error_free_buf_dir_name:
|
||||
free(buf_dir_name);
|
||||
error_free_triggername:
|
||||
free(trigger_name);
|
||||
error_free_dev_dir_name:
|
||||
free(dev_dir_name);
|
||||
error_ret:
|
||||
return ret;
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user