From edab1cd0f0fdc7be3e0e379791d433f2a213e217 Mon Sep 17 00:00:00 2001
From: TMRh20 <tmrh20@gmail.com>
Date: Tue, 13 Feb 2024 05:56:36 -0600
Subject: [PATCH] Minor update

- Try using gpiochip4 then 0 if that fails to support RPi5
- Remove old GPIO code
---
 utility/SPIDEV/gpio.cpp | 168 +++-------------------------------------
 utility/SPIDEV/gpio.h   |   3 +-
 2 files changed, 10 insertions(+), 161 deletions(-)

diff --git a/utility/SPIDEV/gpio.cpp b/utility/SPIDEV/gpio.cpp
index 2d6f8707..b6bac03a 100644
--- a/utility/SPIDEV/gpio.cpp
+++ b/utility/SPIDEV/gpio.cpp
@@ -22,14 +22,7 @@
 #include <sys/stat.h>
 #include <getopt.h>
 
-const char* dev_name = "/dev/gpiochip0";
-
-#define NEWGPIO
-
-
-//std::map<int, GPIOfdCache_t> GPIO::cache;
-
-
+char* dev_name = "/dev/gpiochip4";
 
 GPIO::GPIO()
 {
@@ -42,86 +35,23 @@ GPIO::~GPIO()
 int fd;
 
 void GPIO::Gopen(int port, int DDR)
-{
- 
-   
+{   
   fd = open(dev_name, O_RDONLY);
   if (fd >= 0){
     close(fd);
   }else{
-    throw GPIOException("Can't open device");
-  }
-  
-    #if !defined NEWGPIO
-
-
-    FILE* f;
-    f = fopen("/sys/class/gpio/export", "w");
-    if (f == NULL) {
-        throw GPIOException("can't export GPIO pin .check access rights");
-    }
-    fprintf(f, "%d\n", port);
-    fclose(f);
-
-    int counter = 0;
-    char file[128];
-    sprintf(file, "/sys/class/gpio/gpio%d/direction", port);
-
-    while ((f = fopen(file, "w")) == NULL) { //Wait 10 seconds for the file to be accessible if not open on first attempt
-        sleep(1);
-        counter++;
-        if (counter > 10) {
-            throw GPIOException("can't access /sys/class/gpio/gpio%d/direction GPIO pin. check access rights");
-            /*perror("Could not open /sys/class/gpio/gpio%d/direction");
-            exit(0); */
-        }
-    }
-    int l = (DDR == 0) ? fprintf(f, "in\n") : fprintf(f, "out\n");
-    if (!(l == 3 || l == 4)) {
-        fclose(f);
-        throw GPIOException("can't set direction on GPIO pin. check access rights");
-    }
-    /*
-    if (DDR == 0)
-        fprintf(f, "in\n");
-    else
-        printf(f, "out\n");
-    */
-    fclose(f);
-
-    // Caches the GPIO descriptor;
-    sprintf(file, "/sys/class/gpio/gpio%d/value", port);
-    int flags = (DDR == 0) ? O_RDONLY : O_WRONLY;
-    int fd = ::open(file, flags);
-    if (fd < 0) {
-        throw GPIOException("Can't open the GPIO");
-    }
-    else {
-        cache[port] = fd; // cache the fd;
-        lseek(fd, SEEK_SET, 0);
+    dev_name = "/dev/gpiochip0";
+    fd = open(dev_name, O_RDONLY);
+    if (fd >= 0){
+      close(fd);
+    }else{
+      throw GPIOException("can't open /dev/gpiochip");
     }
-  #endif
-  
+  }
 }
 
 void GPIO::Gclose(int port)
 {
-    close(fd);
-    #if !defined NEWGPIO
-    std::map<int, GPIOfdCache_t>::iterator i;
-    i = cache.find(port);
-    if (i != cache.end()) {
-        close(i->second); // close the cached fd
-        cache.erase(i);   // Delete cache entry
-    }
-    // Do unexport
-    FILE* f;
-    f = fopen("/sys/class/gpio/unexport", "w");
-    if (f != NULL) {
-        fprintf(f, "%d\n", port);
-        fclose(f);
-    }
-    #endif
 }
 
 int GPIO::Gread(int port)
@@ -151,45 +81,6 @@ int GPIO::Gread(int port)
     }
     return -1;
     
-    #if !defined NEWGPIO
-    std::map<int, GPIOfdCache_t>::iterator i;
-    int fd;
-    i = cache.find(port);
-    if (i == cache.end()) { // Fallback to open the gpio
-        GPIO::open(port, GPIO::DIRECTION_IN);
-        i = cache.find(port);
-        if (i == cache.end()) {
-            throw GPIOException("can't access to GPIO");
-        }
-        else {
-            fd = i->second;
-        }
-    }
-    else {
-        fd = i->second;
-    }
-
-    char c;
-    if (lseek(fd, 0, SEEK_SET) == 0 && ::read(fd, &c, 1) == 1) {
-        return (c == '0') ? 0 : 1;
-    }
-    else {
-        throw GPIOException("can't access to GPIO");
-    }
-
-    /*
-    FILE *f;
-
-    char file[128];
-    sprintf(file, "/sys/class/gpio/gpio%d/value", port);
-    f = fopen(file, "r");
-
-    int i;
-    fscanf(f, "%d", &i);
-    fclose(f);
-    return i;
-    */
-    #endif
 }
 
 void GPIO::Gwrite(int port, int value)
@@ -219,46 +110,5 @@ void GPIO::Gwrite(int port, int value)
       return;
     }
     close(rq.fd);
-    
-    #if !defined NEWGPIO
-    std::map<int, GPIOfdCache_t>::iterator i;
-    int fd;
-    i = cache.find(port);
-    if (i == cache.end()) { // Fallback to open the gpio
-        GPIO::open(port, GPIO::DIRECTION_OUT);
-        i = cache.find(port);
-        if (i == cache.end()) {
-            throw GPIOException("can't access to GPIO");
-        }
-        else {
-            fd = i->second;
-        }
-    }
-    else {
-        fd = i->second;
-    }
-
-    if (lseek(fd, 0, SEEK_SET) != 0) {
-        throw GPIOException("can't access to GPIO");
-    }
-    int l = (value == 0) ? ::write(fd, "0\n", 2) : ::write(fd, "1\n", 2);
-    if (l != 2) {
-        throw GPIOException("can't access to GPIO");
-    }
-
-    /*
-    FILE *f;
-
-    char file[128];
-    sprintf(file, "/sys/class/gpio/gpio%d/value", port);
-    f = fopen(file, "w");
-
-    if (value == 0)
-        fprintf(f, "0\n");
-    else
-        fprintf(f, "1\n");
 
-    fclose(f);
-    */
-    #endif
 }
diff --git a/utility/SPIDEV/gpio.h b/utility/SPIDEV/gpio.h
index aa7cd629..6b7f5809 100644
--- a/utility/SPIDEV/gpio.h
+++ b/utility/SPIDEV/gpio.h
@@ -53,8 +53,7 @@ class GPIO
     virtual ~GPIO();
     
 private:
-    /* fd cache */
-    //static std::map<int, GPIOfdCache_t> cache;
+
 };
 
 #endif // RF24_UTILITY_SPIDEV_GPIO_H_