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Fixing the code to handle pulling the right XIO base number due to the change in the CHIP OS 1.1 with the 4.4 kernel, thanks to howientc and fordsfords for their help

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This commit is contained in:
Robert Wolterman
2016-06-18 14:34:41 -05:00
parent 133453c57e
commit 818be5202e
3 changed files with 133 additions and 48 deletions
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167
source/common.c
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@ -40,6 +40,12 @@ SOFTWARE.
#include <dirent.h>
#include <time.h>
#include "common.h"
#include <stdio.h>
#include <dirent.h>
#include <string.h>
#include <sys/stat.h>
#include <stdlib.h>
#include <assert.h>
int setup_error = 0;
int module_setup = 0;
@ -137,12 +143,77 @@ pins_t table[] = {
{ NULL, NULL, 0 }
};
// CREDIT FOR THIS FUNCTION DUE TO HOWIE KATZ OF NTC AND STEVE FORD
// THIS WILL FIND THE PROPER XIO BASE SYSFS NUMBER
// PORTED TO C FORM HOWIE'S PYTHON CODE WITH THE HELP OF STEVE:
// https://gist.github.com/howientc/606545e0ff47e2cda61f14fca5c46eee
// HAT TIP TO:
// http://stackoverflow.com/questions/8149569/scan-a-directory-to-find-files-in-c
// http://stackoverflow.com/questions/612097/how-can-i-get-the-list-of-files-in-a-directory-using-c-or-c
#define GPIO_PATH "/sys/class/gpio"
#define EXPANDER "pcf8574a\n"
#define OLDXIOBASE 408
int get_xio_base()
{
int xiobase = -1;
char label_file[80];
FILE *label_fp;
char base_file[80];
FILE *base_fp;
char input_line[80];
DIR *dir;
struct dirent *ent;
struct stat sbuf;
if ((dir = opendir (GPIO_PATH)) != NULL) {
while ((ent = readdir (dir)) != NULL) {
lstat(ent->d_name,&sbuf);
if (S_ISDIR(sbuf.st_mode)) {
if (strcmp(".",ent->d_name) == 0 || strcmp("..",ent->d_name) == 0) {
continue;
}
//printf ("%s\n", ent->d_name);
sprintf(label_file, "%s/%s/label", GPIO_PATH, ent->d_name);
//printf("label_file='%s'\n", label_file);
label_fp = fopen(label_file, "r");
if (label_fp != NULL) {
fgets(input_line, sizeof(input_line), label_fp); assert(strlen(input_line) < sizeof(input_line)-1);
fclose(label_fp);
if (strcmp(input_line, EXPANDER) == 0) {
/* Found the expander, get the contents of base */
sprintf(base_file, "%s/%s/base", GPIO_PATH, ent->d_name);
base_fp = fopen(base_file, "r"); assert(base_fp != NULL);
fgets(input_line, sizeof(input_line), base_fp); assert(strlen(input_line) < sizeof(input_line)-1);
fclose(base_fp);
xiobase = atoi(input_line);
break; /* Found it, exit the while */
}
}
}
}
closedir (dir);
}
return xiobase;
}
int lookup_gpio_by_key(const char *key)
{
pins_t *p;
for (p = table; p->key != NULL; ++p) {
if (strcmp(p->key, key) == 0) {
return p->gpio;
// FIGURE OUT IF WE'RE AN XIO PIN USING THE DEFAULT PINS
if (p->gpio >= 408) {
int gbase = get_xio_base();
if (gbase != -1) {
return gbase - (p->gpio - OLDXIOBASE);
} else {
return 0;
}
} else {
return p->gpio;
}
}
}
return 0;
@ -153,7 +224,17 @@ int lookup_gpio_by_name(const char *name)
pins_t *p;
for (p = table; p->name != NULL; ++p) {
if (strcmp(p->name, name) == 0) {
return p->gpio;
// FIGURE OUT IF WE'RE AN XIO PIN USING THE DEFAULT PINS
if (p->gpio >= 408) {
int gbase = get_xio_base();
if (gbase != -1) {
return gbase - (p->gpio - OLDXIOBASE);
} else {
return 0;
}
} else {
return p->gpio;
}
}
}
return 0;
@ -187,20 +268,20 @@ int lookup_ain_by_name(const char *name)
}
}
return -1;
}
int copy_key_by_key(const char *input_key, char *key)
{
pins_t *p;
for (p = table; p->key != NULL; ++p) {
if (strcmp(p->key, input_key) == 0) {
strncpy(key, p->key, 7);
key[7] = '\0';
return 1;
}
}
return 0;
}
}
int copy_key_by_key(const char *input_key, char *key)
{
pins_t *p;
for (p = table; p->key != NULL; ++p) {
if (strcmp(p->key, input_key) == 0) {
strncpy(key, p->key, 7);
key[7] = '\0';
return 1;
}
}
return 0;
}
int copy_pwm_key_by_key(const char *input_key, char *key)
{
@ -217,22 +298,22 @@ int copy_pwm_key_by_key(const char *input_key, char *key)
}
}
return 0;
}
int get_key_by_name(const char *name, char *key)
{
pins_t *p;
for (p = table; p->name != NULL; ++p) {
if (strcmp(p->name, name) == 0) {
strncpy(key, p->key, 7);
key[7] = '\0';
return 1;
}
}
return 0;
}
}
int get_pwm_key_by_name(const char *name, char *key)
int get_key_by_name(const char *name, char *key)
{
pins_t *p;
for (p = table; p->name != NULL; ++p) {
if (strcmp(p->name, name) == 0) {
strncpy(key, p->key, 7);
key[7] = '\0';
return 1;
}
}
return 0;
}
int get_pwm_key_by_name(const char *name, char *key)
{
pins_t *p;
for (p = table; p->name != NULL; ++p) {
@ -258,16 +339,16 @@ int get_gpio_number(const char *key, unsigned int *gpio)
}
return 0;
}
int get_key(const char *input, char *key)
{
if (!copy_key_by_key(input, key)) {
return get_key_by_name(input, key);
}
return 1;
}
}
int get_key(const char *input, char *key)
{
if (!copy_key_by_key(input, key)) {
return get_key_by_name(input, key);
}
return 1;
}
int get_pwm_key(const char *input, char *key)
{
@ -276,8 +357,8 @@ int get_pwm_key(const char *input, char *key)
}
return 1;
}
}
int get_adc_ain(const char *key, unsigned int *ain)
{
*ain = lookup_ain_by_key(key);