aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/staging/iio/Documentation/iio_utils.h
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/staging/iio/Documentation/iio_utils.h')
-rw-r--r--drivers/staging/iio/Documentation/iio_utils.h266
1 files changed, 171 insertions, 95 deletions
diff --git a/drivers/staging/iio/Documentation/iio_utils.h b/drivers/staging/iio/Documentation/iio_utils.h
index 74d312473378..a4555e6f133f 100644
--- a/drivers/staging/iio/Documentation/iio_utils.h
+++ b/drivers/staging/iio/Documentation/iio_utils.h
@@ -7,111 +7,173 @@
* the Free Software Foundation.
*/
+/* Made up value to limit allocation sizes */
+#include <string.h>
+#include <stdlib.h>
+
+#define IIO_MAX_NAME_LENGTH 30
+
#define IIO_EVENT_CODE_RING_50_FULL 200
#define IIO_EVENT_CODE_RING_75_FULL 201
#define IIO_EVENT_CODE_RING_100_FULL 202
+const char *iio_dir = "/sys/bus/iio/devices/";
+
struct iio_event_data {
int id;
__s64 timestamp;
};
-
-inline char *find_ring_subelement(const char *directory, const char *subelement)
-{
- DIR *dp;
- const struct dirent *ent;
- int pos;
- char temp[100];
- char *returnstring;
- dp = opendir(directory);
- if (dp == NULL) {
- printf("could not directory: %s\n", directory);
- return NULL;
- }
- while (ent = readdir(dp), ent != NULL) {
- if (strcmp(ent->d_name, ".") != 0 &&
- strcmp(ent->d_name, "..") != 0) {
- if (strncmp(ent->d_name, subelement, strlen(subelement)) == 0) {
- int length = sprintf(temp, "%s%s%s", directory, ent->d_name, "/");
- returnstring = malloc(length+1);
- strncpy(returnstring, temp, length+1);
- return returnstring;
-
- }
- }
- }
- return 0;
-}
-
-
-char *find_type_by_name(const char *name, const char *type)
+/**
+ * find_type_by_name() - function to match top level types by name
+ * @name: top level type instance name
+ * @type: the type of top level instance being sort
+ *
+ * Typical types this is used for are device and trigger.
+ **/
+inline int find_type_by_name(const char *name, const char *type)
{
- const char *iio_dir = "/sys/class/iio/";
const struct dirent *ent;
- int cnt, pos, pos2;
+ int number, numstrlen;
FILE *nameFile;
DIR *dp;
- char thisname[100];
- char temp[100];
-
- char *returnstring = NULL;
+ char thisname[IIO_MAX_NAME_LENGTH];
+ char *filename;
struct stat Stat;
- pos = sprintf(temp, "%s", iio_dir);
+
dp = opendir(iio_dir);
if (dp == NULL) {
printf("No industrialio devices available");
- return NULL;
+ return -ENODEV;
}
+
while (ent = readdir(dp), ent != NULL) {
- cnt++;
- /*reject . and .. */
if (strcmp(ent->d_name, ".") != 0 &&
- strcmp(ent->d_name, "..") != 0) {
- /*make sure it isn't a trigger!*/
- if (strncmp(ent->d_name, type, strlen(type)) == 0) {
- /* build full path to new file */
- pos2 = pos + sprintf(temp + pos, "%s/", ent->d_name);
- sprintf(temp + pos2, "name");
- printf("search location %s\n", temp);
- nameFile = fopen(temp, "r");
- if (!nameFile) {
- sprintf(temp + pos2, "modalias", ent->d_name);
- nameFile = fopen(temp, "r");
- if (!nameFile) {
- printf("Failed to find a name for device\n");
- return NULL;
- }
- }
+ strcmp(ent->d_name, "..") != 0 &&
+ strlen(ent->d_name) > strlen(type) &&
+ strncmp(ent->d_name, type, strlen(type)) == 0) {
+ numstrlen = sscanf(ent->d_name + strlen(type),
+ "%d",
+ &number);
+ /* verify the next character is not a colon */
+ if (strncmp(ent->d_name + strlen(type) + numstrlen,
+ ":",
+ 1) != 0) {
+ filename = malloc(strlen(iio_dir)
+ + strlen(type)
+ + 1
+ + numstrlen
+ + 1);
+ if (filename == NULL)
+ return -ENOMEM;
+ sprintf(filename, "%s%s%d/name",
+ iio_dir,
+ type,
+ number);
+ nameFile = fopen(filename, "r");
+ if (!nameFile)
+ continue;
+ free(filename);
fscanf(nameFile, "%s", thisname);
- if (strcmp(name, thisname) == 0) {
- returnstring = malloc(strlen(temp) + 1);
- sprintf(temp + pos2, "");
- strcpy(returnstring, temp);
- return returnstring;
- }
+ if (strcmp(name, thisname) == 0)
+ return number;
fclose(nameFile);
-
}
}
}
+ return -ENODEV;
}
-int write_sysfs_int(char *filename, char *basedir, int val)
+inline int _write_sysfs_int(char *filename, char *basedir, int val, int verify)
{
int ret;
- FILE *sysfsfp;
- char temp[100];
- sprintf(temp, "%s%s", basedir, filename);
+ FILE *sysfsfp;
+ int test;
+ char *temp = malloc(strlen(basedir) + strlen(filename) + 2);
+ if (temp == NULL)
+ return -ENOMEM;
+ sprintf(temp, "%s/%s", basedir, filename);
sysfsfp = fopen(temp, "w");
- if (sysfsfp == NULL)
- return -1;
+ if (sysfsfp == NULL) {
+ printf("failed to open %s\n", temp);
+ ret = -errno;
+ goto error_free;
+ }
fprintf(sysfsfp, "%d", val);
fclose(sysfsfp);
- return 0;
+ if (verify) {
+ sysfsfp = fopen(temp, "r");
+ if (sysfsfp == NULL) {
+ printf("failed to open %s\n", temp);
+ ret = -errno;
+ goto error_free;
+ }
+ fscanf(sysfsfp, "%d", &test);
+ if (test != val) {
+ printf("Possible failure in int write %d to %s%s\n",
+ val,
+ basedir,
+ filename);
+ ret = -1;
+ }
+ }
+error_free:
+ free(temp);
+ return ret;
}
+int write_sysfs_int(char *filename, char *basedir, int val)
+{
+ return _write_sysfs_int(filename, basedir, val, 0);
+}
+
+int write_sysfs_int_and_verify(char *filename, char *basedir, int val)
+{
+ return _write_sysfs_int(filename, basedir, val, 1);
+}
+
+int _write_sysfs_string(char *filename, char *basedir, char *val, int verify)
+{
+ int ret;
+ FILE *sysfsfp;
+ char *temp = malloc(strlen(basedir) + strlen(filename) + 2);
+ if (temp == NULL) {
+ printf("Memory allocation failed\n");
+ return -ENOMEM;
+ }
+ sprintf(temp, "%s/%s", basedir, filename);
+ sysfsfp = fopen(temp, "w");
+ if (sysfsfp == NULL) {
+ printf("Could not open %s\n", temp);
+ ret = -errno;
+ goto error_free;
+ }
+ fprintf(sysfsfp, "%s", val);
+ fclose(sysfsfp);
+ if (verify) {
+ sysfsfp = fopen(temp, "r");
+ if (sysfsfp == NULL) {
+ ret = -errno;
+ goto error_free;
+ }
+ fscanf(sysfsfp, "%s", temp);
+ if (strcmp(temp, val) != 0) {
+ printf("Possible failure in string write of %s "
+ "Should be %s "
+ "writen to %s\%s\n",
+ temp,
+ val,
+ basedir,
+ filename);
+ ret = -1;
+ }
+ }
+error_free:
+ free(temp);
+
+ return ret;
+}
/**
* write_sysfs_string_and_verify() - string write, readback and verify
* @filename: name of file to write to
@@ -120,40 +182,54 @@ int write_sysfs_int(char *filename, char *basedir, int val)
**/
int write_sysfs_string_and_verify(char *filename, char *basedir, char *val)
{
- int ret;
- FILE *sysfsfp;
- char temp[100];
- sprintf(temp, "%s%s", basedir, filename);
- sysfsfp = fopen(temp, "w");
- if (sysfsfp == NULL)
- return -1;
- fprintf(sysfsfp, "%s", val);
- fclose(sysfsfp);
+ return _write_sysfs_string(filename, basedir, val, 1);
+}
- sysfsfp = fopen(temp, "r");
- if (sysfsfp == NULL)
- return -1;
- fscanf(sysfsfp, "%s", temp);
- if (strcmp(temp, val) != 0) {
- printf("Possible failure in string write %s to %s%s \n",
- val,
- basedir,
- filename);
- return -1;
- }
- return 0;
+int write_sysfs_string(char *filename, char *basedir, char *val)
+{
+ return _write_sysfs_string(filename, basedir, val, 0);
}
int read_sysfs_posint(char *filename, char *basedir)
{
int ret;
FILE *sysfsfp;
- char temp[100];
- sprintf(temp, "%s%s", basedir, filename);
+ char *temp = malloc(strlen(basedir) + strlen(filename) + 2);
+ if (temp == NULL) {
+ printf("Memory allocation failed");
+ return -ENOMEM;
+ }
+ sprintf(temp, "%s/%s", basedir, filename);
sysfsfp = fopen(temp, "r");
- if (sysfsfp == NULL)
- return -1;
+ if (sysfsfp == NULL) {
+ ret = -errno;
+ goto error_free;
+ }
fscanf(sysfsfp, "%d\n", &ret);
fclose(sysfsfp);
+error_free:
+ free(temp);
+ return ret;
+}
+
+int read_sysfs_float(char *filename, char *basedir, float *val)
+{
+ float ret = 0;
+ FILE *sysfsfp;
+ char *temp = malloc(strlen(basedir) + strlen(filename) + 2);
+ if (temp == NULL) {
+ printf("Memory allocation failed");
+ return -ENOMEM;
+ }
+ sprintf(temp, "%s/%s", basedir, filename);
+ sysfsfp = fopen(temp, "r");
+ if (sysfsfp == NULL) {
+ ret = -errno;
+ goto error_free;
+ }
+ fscanf(sysfsfp, "%f\n", val);
+ fclose(sysfsfp);
+error_free:
+ free(temp);
return ret;
}
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.