X-Git-Url: https://git.karo-electronics.de/?a=blobdiff_plain;f=drivers%2Fstaging%2Fiio%2FDocumentation%2Fiio_utils.h;fp=drivers%2Fstaging%2Fiio%2FDocumentation%2Fiio_utils.h;h=03724246b95ad8a6bd350f18cc76a4f69c0d3900;hb=59f40aff7930052a74ddf5c297aa1974b0838529;hp=014f6684faba94f8ba6c28fcd606a131050bfdde;hpb=291b7c3a02a7eafbb8ea89a2c0e93676d6972926;p=mv-sheeva.git

diff --git a/drivers/staging/iio/Documentation/iio_utils.h b/drivers/staging/iio/Documentation/iio_utils.h
index 014f6684fab..03724246b95 100644
--- a/drivers/staging/iio/Documentation/iio_utils.h
+++ b/drivers/staging/iio/Documentation/iio_utils.h
@@ -10,12 +10,23 @@
 /* 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/";
 
@@ -24,6 +35,380 @@ struct iio_event_data {
 	__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", &current->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,
+						     &current->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", &current->index);
+			fclose(sysfsfp);
+			free(filename);
+			/* Find the scale */
+			ret = iioutils_get_param_float(&current->scale,
+						       "scale",
+						       device_dir,
+						       current->name,
+						       current->generic_name);
+			if (ret < 0)
+				goto error_cleanup_array;
+			ret = iioutils_get_param_float(&current->offset,
+						       "offset",
+						       device_dir,
+						       current->name,
+						       current->generic_name);
+			if (ret < 0)
+				goto error_cleanup_array;
+			ret = iioutils_get_type(&current->is_signed,
+						&current->bytes,
+						&current->bits_used,
+						&current->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(&current[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
@@ -40,7 +425,6 @@ inline int find_type_by_name(const char *name, const char *type)
 	DIR *dp;
 	char thisname[IIO_MAX_NAME_LENGTH];
 	char *filename;
-	struct stat Stat;
 
 	dp = opendir(iio_dir);
 	if (dp == NULL) {
@@ -134,7 +518,7 @@ int write_sysfs_int_and_verify(char *filename, char *basedir, int val)
 
 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) {
@@ -153,6 +537,7 @@ int _write_sysfs_string(char *filename, char *basedir, char *val, int verify)
 	if (verify) {
 		sysfsfp = fopen(temp, "r");
 		if (sysfsfp == NULL) {
+			printf("could not open file to verify\n");
 			ret = -errno;
 			goto error_free;
 		}
@@ -173,6 +558,7 @@ error_free:
 
 	return ret;
 }
+
 /**
  * write_sysfs_string_and_verify() - string write, readback and verify
  * @filename: name of file to write to