/* Made up value to limit allocation sizes */
#include <string.h>
#include <stdlib.h>
+#include <ctype.h>
+#include <stdio.h>
+#include <stdint.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
+#define IIO_EV_CLASS_BUFFER 0
+#define IIO_BUFFER_EVENT_CODE(code) \
+ (IIO_EV_CLASS_BUFFER | (code << 8))
+
+#define IIO_EVENT_CODE_RING_50_FULL IIO_BUFFER_EVENT_CODE(0)
+#define IIO_EVENT_CODE_RING_75_FULL IIO_BUFFER_EVENT_CODE(1)
+#define IIO_EVENT_CODE_RING_100_FULL IIO_BUFFER_EVENT_CODE(2)
+
+
+#define FORMAT_SCAN_ELEMENTS_DIR "%s:buffer0/scan_elements"
+#define FORMAT_TYPE_FILE "%s_type"
const char *iio_dir = "/sys/bus/iio/devices/";
__s64 timestamp;
};
+/**
+ * iioutils_break_up_name() - extract generic name from full channel name
+ * @full_name: the full channel name
+ * @generic_name: the output generic channel name
+ **/
+static int iioutils_break_up_name(const char *full_name,
+ char **generic_name)
+{
+ char *current;
+ char *w, *r;
+ char *working;
+ current = strdup(full_name);
+ working = strtok(current, "_\0");
+ w = working;
+ r = working;
+
+ while(*r != '\0') {
+ if (!isdigit(*r)) {
+ *w = *r;
+ w++;
+ }
+ r++;
+ }
+ *w = '\0';
+ *generic_name = strdup(working);
+ free(current);
+
+ return 0;
+}
+
+/**
+ * struct iio_channel_info - information about a given channel
+ * @name: channel name
+ * @generic_name: general name for channel type
+ * @scale: scale factor to be applied for conversion to si units
+ * @offset: offset to be applied for conversion to si units
+ * @index: the channel index in the buffer output
+ * @bytes: number of bytes occupied in buffer output
+ * @mask: a bit mask for the raw output
+ * @is_signed: is the raw value stored signed
+ * @enabled: is this channel enabled
+ **/
+struct iio_channel_info {
+ char *name;
+ char *generic_name;
+ float scale;
+ float offset;
+ unsigned index;
+ unsigned bytes;
+ unsigned bits_used;
+ uint64_t mask;
+ unsigned is_signed;
+ unsigned enabled;
+ unsigned location;
+};
+
+/**
+ * iioutils_get_type() - find and process _type attribute data
+ * @is_signed: output whether channel is signed
+ * @bytes: output how many bytes the channel storage occupies
+ * @mask: output a bit mask for the raw data
+ * @device_dir: the iio device directory
+ * @name: the channel name
+ * @generic_name: the channel type name
+ **/
+inline int iioutils_get_type(unsigned *is_signed,
+ unsigned *bytes,
+ unsigned *bits_used,
+ uint64_t *mask,
+ const char *device_dir,
+ const char *name,
+ const char *generic_name)
+{
+ FILE *sysfsfp;
+ int ret;
+ DIR *dp;
+ char *scan_el_dir, *builtname, *builtname_generic, *filename = 0;
+ char signchar;
+ unsigned sizeint, padint;
+ const struct dirent *ent;
+
+ ret = asprintf(&scan_el_dir, FORMAT_SCAN_ELEMENTS_DIR, device_dir);
+ if (ret < 0) {
+ ret = -ENOMEM;
+ goto error_ret;
+ }
+ ret = asprintf(&builtname, FORMAT_TYPE_FILE, name);
+ if (ret < 0) {
+ ret = -ENOMEM;
+ goto error_free_scan_el_dir;
+ }
+ ret = asprintf(&builtname_generic, FORMAT_TYPE_FILE, generic_name);
+ if (ret < 0) {
+ ret = -ENOMEM;
+ goto error_free_builtname;
+ }
+
+ dp = opendir(scan_el_dir);
+ if (dp == NULL) {
+ ret = -errno;
+ goto error_free_builtname_generic;
+ }
+ while (ent = readdir(dp), ent != NULL)
+ /*
+ * Do we allow devices to override a generic name with
+ * a specific one?
+ */
+ if ((strcmp(builtname, ent->d_name) == 0) ||
+ (strcmp(builtname_generic, ent->d_name) == 0)) {
+ ret = asprintf(&filename,
+ "%s/%s", scan_el_dir, ent->d_name);
+ if (ret < 0) {
+ ret = -ENOMEM;
+ goto error_closedir;
+ }
+ sysfsfp = fopen(filename, "r");
+ if (sysfsfp == NULL) {
+ printf("failed to open %s\n", filename);
+ ret = -errno;
+ goto error_free_filename;
+ }
+ fscanf(sysfsfp,
+ "%c%u/%u", &signchar, bits_used, &padint);
+ *bytes = padint / 8;
+ if (sizeint == 64)
+ *mask = ~0;
+ else
+ *mask = (1 << *bits_used) - 1;
+ if (signchar == 's')
+ *is_signed = 1;
+ else
+ *is_signed = 0;
+ }
+error_free_filename:
+ if (filename)
+ free(filename);
+error_closedir:
+ closedir(dp);
+error_free_builtname_generic:
+ free(builtname_generic);
+error_free_builtname:
+ free(builtname);
+error_free_scan_el_dir:
+ free(scan_el_dir);
+error_ret:
+ return ret;
+}
+
+inline int iioutils_get_param_float(float *output,
+ const char *param_name,
+ const char *device_dir,
+ const char *name,
+ const char *generic_name)
+{
+ FILE *sysfsfp;
+ int ret;
+ DIR *dp;
+ char *builtname, *builtname_generic;
+ char *filename = NULL;
+ const struct dirent *ent;
+
+ ret = asprintf(&builtname, "%s_%s", name, param_name);
+ if (ret < 0) {
+ ret = -ENOMEM;
+ goto error_ret;
+ }
+ ret = asprintf(&builtname_generic,
+ "%s_%s", generic_name, param_name);
+ if (ret < 0) {
+ ret = -ENOMEM;
+ goto error_free_builtname;
+ }
+ dp = opendir(device_dir);
+ if (dp == NULL) {
+ ret = -errno;
+ goto error_free_builtname_generic;
+ }
+ while (ent = readdir(dp), ent != NULL)
+ if ((strcmp(builtname, ent->d_name) == 0) ||
+ (strcmp(builtname_generic, ent->d_name) == 0)) {
+ ret = asprintf(&filename,
+ "%s/%s", device_dir, ent->d_name);
+ if (ret < 0) {
+ ret = -ENOMEM;
+ goto error_closedir;
+ }
+ sysfsfp = fopen(filename, "r");
+ if (!sysfsfp) {
+ ret = -errno;
+ goto error_free_filename;
+ }
+ fscanf(sysfsfp, "%f", output);
+ break;
+ }
+error_free_filename:
+ if (filename)
+ free(filename);
+error_closedir:
+ closedir(dp);
+error_free_builtname_generic:
+ free(builtname_generic);
+error_free_builtname:
+ free(builtname);
+error_ret:
+ return ret;
+}
+
+
+/**
+ * build_channel_array() - function to figure out what channels are present
+ * @device_dir: the IIO device directory in sysfs
+ * @
+ **/
+inline int build_channel_array(const char *device_dir,
+ struct iio_channel_info **ci_array,
+ int *counter)
+{
+ DIR *dp;
+ FILE *sysfsfp;
+ int count = 0, temp, i;
+ struct iio_channel_info *current;
+ int ret;
+ const struct dirent *ent;
+ char *scan_el_dir;
+ char *filename;
+
+ *counter = 0;
+ ret = asprintf(&scan_el_dir, FORMAT_SCAN_ELEMENTS_DIR, device_dir);
+ if (ret < 0) {
+ ret = -ENOMEM;
+ goto error_ret;
+ }
+ dp = opendir(scan_el_dir);
+ if (dp == NULL) {
+ ret = -errno;
+ goto error_free_name;
+ }
+ while (ent = readdir(dp), ent != NULL)
+ if (strcmp(ent->d_name + strlen(ent->d_name) - strlen("_en"),
+ "_en") == 0) {
+ ret = asprintf(&filename,
+ "%s/%s", scan_el_dir, ent->d_name);
+ if (ret < 0) {
+ ret = -ENOMEM;
+ goto error_close_dir;
+ }
+ sysfsfp = fopen(filename, "r");
+ if (sysfsfp == NULL) {
+ ret = -errno;
+ free(filename);
+ goto error_close_dir;
+ }
+ fscanf(sysfsfp, "%u", &ret);
+ if (ret == 1)
+ (*counter)++;
+ fclose(sysfsfp);
+ free(filename);
+ }
+ *ci_array = malloc(sizeof(**ci_array)*(*counter));
+ if (*ci_array == NULL) {
+ ret = -ENOMEM;
+ goto error_close_dir;
+ }
+ seekdir(dp, 0);
+ while (ent = readdir(dp), ent != NULL) {
+ if (strcmp(ent->d_name + strlen(ent->d_name) - strlen("_en"),
+ "_en") == 0) {
+ current = &(*ci_array)[count++];
+ ret = asprintf(&filename,
+ "%s/%s", scan_el_dir, ent->d_name);
+ if (ret < 0) {
+ ret = -ENOMEM;
+ /* decrement count to avoid freeing name */
+ count--;
+ goto error_cleanup_array;
+ }
+ sysfsfp = fopen(filename, "r");
+ if (sysfsfp == NULL) {
+ free(filename);
+ ret = -errno;
+ goto error_cleanup_array;
+ }
+ fscanf(sysfsfp, "%u", ¤t->enabled);
+ fclose(sysfsfp);
+ free(filename);
+ current->scale = 1.0;
+ current->offset = 0;
+ current->name = strndup(ent->d_name,
+ strlen(ent->d_name) -
+ strlen("_en"));
+ if (current->name == NULL) {
+ free(filename);
+ ret = -ENOMEM;
+ goto error_cleanup_array;
+ }
+ /* Get the generic and specific name elements */
+ ret = iioutils_break_up_name(current->name,
+ ¤t->generic_name);
+ if (ret) {
+ free(filename);
+ goto error_cleanup_array;
+ }
+ ret = asprintf(&filename,
+ "%s/%s_index",
+ scan_el_dir,
+ current->name);
+ if (ret < 0) {
+ free(filename);
+ ret = -ENOMEM;
+ goto error_cleanup_array;
+ }
+ sysfsfp = fopen(filename, "r");
+ fscanf(sysfsfp, "%u", ¤t->index);
+ fclose(sysfsfp);
+ free(filename);
+ /* Find the scale */
+ ret = iioutils_get_param_float(¤t->scale,
+ "scale",
+ device_dir,
+ current->name,
+ current->generic_name);
+ if (ret < 0)
+ goto error_cleanup_array;
+ ret = iioutils_get_param_float(¤t->offset,
+ "offset",
+ device_dir,
+ current->name,
+ current->generic_name);
+ if (ret < 0)
+ goto error_cleanup_array;
+ ret = iioutils_get_type(¤t->is_signed,
+ ¤t->bytes,
+ ¤t->bits_used,
+ ¤t->mask,
+ device_dir,
+ current->name,
+ current->generic_name);
+ }
+ }
+ /* reorder so that the array is in index order*/
+ current = malloc(sizeof(**ci_array)**counter);
+ if (current == NULL) {
+ ret = -ENOMEM;
+ goto error_cleanup_array;
+ }
+ closedir(dp);
+ count = 0;
+ temp = 0;
+ while (count < *counter)
+ for (i = 0; i < *counter; i++)
+ if ((*ci_array)[i].index == temp) {
+ memcpy(¤t[count++],
+ &(*ci_array)[i],
+ sizeof(*current));
+ temp++;
+ break;
+ }
+ free(*ci_array);
+ *ci_array = current;
+
+ return 0;
+
+error_cleanup_array:
+ for (i = count - 1; i >= 0; i++)
+ free((*ci_array)[i].name);
+ free(*ci_array);
+error_close_dir:
+ closedir(dp);
+error_free_name:
+ free(scan_el_dir);
+error_ret:
+ return ret;
+}
+
/**
* find_type_by_name() - function to match top level types by name
* @name: top level type instance name
DIR *dp;
char thisname[IIO_MAX_NAME_LENGTH];
char *filename;
- struct stat Stat;
dp = opendir(iio_dir);
if (dp == NULL) {
int _write_sysfs_string(char *filename, char *basedir, char *val, int verify)
{
- int ret;
+ int ret = 0;
FILE *sysfsfp;
char *temp = malloc(strlen(basedir) + strlen(filename) + 2);
if (temp == NULL) {
if (verify) {
sysfsfp = fopen(temp, "r");
if (sysfsfp == NULL) {
+ printf("could not open file to verify\n");
ret = -errno;
goto error_free;
}
return ret;
}
+
/**
* write_sysfs_string_and_verify() - string write, readback and verify
* @filename: name of file to write to
projects / mv-sheeva.git / blobdiff