Modified to be as identical to the linux_test_nopointer in order to have a good benchmark nedd to comparre size wehn addin more than one pin

README.md

@@ -31,6 +31,13 @@ this will also create the build diretory for you.
 ```./ked_executable -pin 21 -dir out -set```
 Will set GPIO21 pin (HEADER 40) to High
 
+#Size Difference with version that has no function pointers
 
+```
+Size
+text   data     bss     dec     hex  filename
+3836    332	    16	    4184	1058 ked_executable
+
+```
 
 

examples/pin_control.c

@@ -1,6 +1,6 @@
 /**
  * @file gpio_control.c
- * @brief CLI utility to control GPIOs using KED GPIO interface (Linux).
+ * @brief CLI utility to control GPIOs using the KED GPIO interface (Linux).
  */
 
 #include "../ked/peripherals/gpio/gpio.h"
@@ -8,64 +8,79 @@
 #include <stdlib.h>
 #include <string.h>
 
+#define GPIOCHIP_DEFAULT "/dev/gpiochip0"
+
+/**
+ * @brief Print usage message for the CLI tool.
+ */
+void print_usage(const char* prog_name) {
+    printf("Usage: %s -pin <number> -set|-reset|-toggle|-read\n", prog_name);
+}
+
 /**
- * @brief Simple command-line tool to test the GPIO API.
+ * @brief Entry point for GPIO control CLI.
  */
 int main(int argc, char* argv[]) {
     if (argc < 4) {
-        printf("Usage: %s -pin <BCM_number> -[set|reset|toggle|read]\n", argv[0]);
+        print_usage(argv[0]);
         return 1;
     }
 
-    unsigned int pin = 0;
+    uint32_t pin = 0;
-    const char* action = NULL;
+    uint8_t action = 0xFF; // 0=set, 1=reset, 2=toggle, 3=read
 
-    for (int i = 1; i < argc; i++) {
+    for (int i = 1; i < argc; ++i) {
         if (strcmp(argv[i], "-pin") == 0 && i + 1 < argc) {
-            pin = (unsigned int)atoi(argv[++i]);
+            pin = atoi(argv[++i]);
-        } else if (strncmp(argv[i], "-", 1) == 0) {
+        } else if (strcmp(argv[i], "-set") == 0) {
-            action = argv[i] + 1; // skip '-' prefix
+            action = 0;
+        } else if (strcmp(argv[i], "-reset") == 0) {
+            action = 1;
+        } else if (strcmp(argv[i], "-toggle") == 0) {
+            action = 2;
+        } else if (strcmp(argv[i], "-read") == 0) {
+            action = 3;
         }
     }
 
-    if (pin == 0 || !action) {
+    if (pin == 0 || action == 0xFF) {
-        fprintf(stderr, "Invalid usage.\n");
+        print_usage(argv[0]);
-        return 1;
+        return 2;
     }
 
-    gpio_t gpio;
+    gpio_t gpio_conf = {
-    gpio_config cfg = {
         .chipname = "/dev/gpiochip0",
         .line_offset = pin,
-        .mode = GPIO_MODE_DEFAULT,
+        .direction = (action == 3) ? T_GPIO_DIRECTION_INPUT : T_GPIO_DIRECTION_OUTPUT,
-        .direction = (strcmp(action, "read") == 0) ? GPIO_DIRECTION_INPUT : GPIO_DIRECTION_OUTPUT,
+        .bias = T_GPIO_BIAS_DEFAULT,
-        .bias = GPIO_BIAS_NONE
+        .mode = T_GPIO_MODE_DEFAULT,
+        .status = T_GPIO_STATUS_NOT_INIT
     };
 
-    gpio_error_t err = ked_gpio_init(&gpio, &cfg);
+
-    if (err != GPIO_OK) {
+    gpio_fn_ptr_t led = {0};
-        if (gpio.on_error) gpio.on_error(err);
+	
+	gpio_error_t err = ked_gpio_init(&gpio_conf, &led);
+    if (err != T_GPIO_ERR_OK) {
+        if (led.on_error) led.on_error(err);
         return 1;
     }
 
-    if (strcmp(action, "set") == 0) {
+    switch (action) {
-        gpio.set(true);
+        case 0:
-        //printf("GPIO%u set HIGH\n", pin);
+			if (led.set) led.set(1);
-    } else if (strcmp(action, "reset") == 0) {
+            break;
-        gpio.set(false);
+        case 1:
-        //printf("GPIO%u set LOW\n", pin);
+			if (led.set) led.set(0);
-    } else if (strcmp(action, "toggle") == 0) {
+            break;
-        gpio.toggle();
+        case 2:
-        //printf("GPIO%u toggled\n", pin);
+			if (led.toggle) led.toggle();
-    } else if (strcmp(action, "read") == 0) {
+            break;
-        bool value = gpio.read();
+        case 3:
-        printf("%s\n", value ? "1" : "0");
+            printf("GPIO%u value: %d\n", pin, led.read());
-    } else {
+            break;
-        fprintf(stderr, "Unknown action: %s\n", action);
-        if (gpio.on_error) gpio.on_error(GPIO_ERR_UNKNOWN);
-        return 1;
     }
 
-    gpio.deinit();
+    // Clean up
     return 0;
 }

ked/peripherals/gpio/gpio.h

@@ -1,6 +1,6 @@
 /**
  **************************************************************************************************
- * @file       pin.h
+ * @file       gpio.h
  * @author     Kerem Yollu & Edwin Koch
  * @date       24.04.2025
  * @version    0.0.1
@@ -12,166 +12,144 @@
  * that allows unified control of digital I/O pins across different platforms,
  * such as microcontrollers or embedded Linux systems (e.g., Raspberry Pi).
  *
- * The interface provides a driver table through which initialization,
+ * The implementation uses a centralized internal function pointer table to map
- * read/write, and toggle operations can be performed in a platform-agnostic way.
+ * platform-specific logic (e.g., Linux or STM32) to a unified interface.
- * Platform-specific implementations must define and populate the `KED_GPIO`
+ * Application code can use `ked_gpio_set()`, `ked_gpio_read()` etc. without dealing with callbacks.
- * driver table with appropriate function pointers.
- *
- * Usage Example:
- * @code
- *   gpio_t* pin = KED_GPIO.init(&config);
- *   KED_GPIO.set(pin, true);
- *   bool state = KED_GPIO.read(pin);
- *   KED_GPIO.toggle(pin);
- * @endcode
- *
- * @todo
- * - 24.04.2025: Implement more function pointer to enhance available gpio operations
- * - 24.04.2025: Implement Defined States, Errors, Configuration Options
  **************************************************************************************************
+ 
  */
-#ifndef KED_PERIPHERALS_GPIO_GPIO_H_
-#define KED_PERIPHERALS_GPIO_GPIO_H_
 
-#include <stdbool.h>
+#ifndef KED_PERIPHERALS_GPIO_H_
+#define KED_PERIPHERALS_GPIO_H_
 
-/**
+#include <stdint.h>
- * @brief Enumeration for GPIO functional modes.
- */
-typedef enum {
-    GPIO_MODE_DEFAULT,
-    GPIO_MODE_INPUT,
-    GPIO_MODE_OUTPUT,
-    GPIO_MODE_ANALOG,
-    GPIO_MODE_ALTERNATE
-} gpio_mode_t;
 
-/**
+#ifdef __cplusplus
- * @brief Enumeration for GPIO direction settings.
+extern "C" {
- */
+#endif
+
+/** GPIO Mode Types */
 typedef enum {
-    GPIO_DIRECTION_INPUT,
+    T_GPIO_MODE_DEFAULT,
-    GPIO_DIRECTION_OUTPUT
+    T_GPIO_MODE_INPUT,
+    T_GPIO_MODE_OUTPUT,
+    T_GPIO_MODE_ANALOG,
+    T_GPIO_MODE_ALTERNATE
+} gpio_function_t;
+
+/** GPIO Direction (explicit) */
+typedef enum {
+    T_GPIO_DIRECTION_INPUT,
+    T_GPIO_DIRECTION_OUTPUT
 } gpio_direction_t;
 
-/**
+/** Drive types for output pins */
- * @brief Enumeration for GPIO drive configurations.
- */
 typedef enum {
-    GPIO_DRIVE_DEFAULT,
+    T_GPIO_DRIVE_DEFAULT,
-    GPIO_DRIVE_PUSH_PULL,
+    T_GPIO_DRIVE_PUSH_PULL,
-    GPIO_DRIVE_OPEN_DRAIN
+    T_GPIO_DRIVE_OPEN_DRAIN
 } gpio_drive_t;
 
-/**
+/** Pull-up/pull-down configurations */
- * @brief Enumeration for internal bias resistor settings.
- */
 typedef enum {
-    GPIO_BIAS_NONE,
+    T_GPIO_BIAS_DEFAULT,
-    GPIO_BIAS_DISABLE,
+    T_GPIO_BIAS_DISABLE,
-    GPIO_BIAS_PULL_UP,
+    T_GPIO_BIAS_PULL_UP,
-    GPIO_BIAS_PULL_DOWN
+    T_GPIO_BIAS_PULL_DOWN
 } gpio_bias_t;
 
-/**
+/** Optional pin speed enumeration */
- * @brief Enumeration for GPIO speed settings.
- */
 typedef enum {
-    GPIO_SPEED_DEFAULT,
+    T_GPIO_SPEED_DEFAULT,
-    GPIO_SPEED_LOW,
+    T_GPIO_SPEED_LOW,
-    GPIO_SPEED_MEDIUM,
+    T_GPIO_SPEED_MEDIUM,
-    GPIO_SPEED_HIGH,
+    T_GPIO_SPEED_HIGH,
-    GPIO_SPEED_VERY_HIGH
+    T_GPIO_SPEED_VERY_HIGH
 } gpio_speed_t;
 
-/**
+/** Enable/disable pin interrupt */
- * @brief Enumeration for enabling or disabling GPIO interrupts.
- */
 typedef enum {
-    GPIO_IRQ_DISABLED,
+    T_GPIO_IRQ_DISABLED,
-    GPIO_IRQ_ENABLED
+    T_GPIO_IRQ_ENABLED
 } gpio_irq_t;
 
-/**
+/** GPIO Status */
- * @brief GPIO error status codes.
+typedef enum {
- */
+    T_GPIO_STATUS_NOT_INIT,   /**< GPIO is not initialized */
+    T_GPIO_STATUS_READY,      /**< GPIO is ready for use */
+    T_GPIO_STATUS_BUSY,       /**< GPIO is currently in use */
+    T_GPIO_STATUS_ERROR,      /**< GPIO encountered an error */
+    T_GPIO_STATUS_UPDATING     /**< GPIO is currently being reconfigured */
+} gpio_status_t;
+
+/** GPIO error status codes */
 typedef enum {
-    GPIO_OK,
+    T_GPIO_ERR_OK,						/*!< Suscess flag for the Init Function */
-    GPIO_ERR_UNSUPPORTED_MODE,
+    T_GPIO_ERR_UNSUPPORTED_MODE,			/*!< Mode is either not valid orsupported by **Hardwaware** */
-    GPIO_ERR_LINE_BUSY,
+	T_GPIO_ERR_UNSUPPORTED_ALTERNATE,		/*!< Alternateive mode is unvalid */
-    GPIO_ERR_NOT_AVAILABLE,
+    T_GPIO_ERR_BUS_BUSY,					/*!< The chosen GPIO BUS is already in Use */
-    GPIO_ERR_NO_PULL,
+    T_GPIO_ERR_NOT_AVAILABLE,				/*!< Pin does Not aloow GPIO functionalities or does not Exists */ 
-    GPIO_ERR_NOT_ANALOG,
+    T_GPIO_ERR_NOT_BIASABLE,				/*!< No Pull-Up or Pull-Down Option are awailable */ 					
-    GPIO_ERR_UNKNOWN
+    T_GPIO_ERR_NO_INTERRUPT_SUPPORT,		/*!< This GPIO Doesn't allow interrupts */ 					
+    T_GPIO_ERR_UNSUPPORTED_DRIVE,			/*!< This gate griving option is Unsupported (Pushpull, open drain etc..) */ 					
+	T_GPIO_ERR_UNSUPPORTED_SPEED,			/*!< The choosen bus speed is not supported */
+	T_GPIO_ERR_UNKNOWN					/*!< Goal Would be To never be Used, but can be helpful during Developpment */
 } gpio_error_t;
 
-/**
+/* === Function pointer types (used internally only) === */
- * @brief Function pointer type for writing a logic level.
- */
-typedef void (*gpio_write_fn)(bool value);
 
-/**
+typedef void         (*fn_ptr_gpio_write)(uint8_t value);
- * @brief Function pointer type for reading a logic level.
+typedef uint8_t      (*fn_ptr_gpio_read)(void);
- */
+typedef void         (*fn_ptr_gpio_toggle)(void);
-typedef bool (*gpio_read_fn)(void);
+typedef void         (*fn_ptr_gpio_error)(gpio_error_t);
-
+typedef gpio_error_t (*fn_ptr_gpio_update)(void);
-/**
- * @brief Function pointer type for toggling a GPIO pin.
- */
-typedef void (*gpio_toggle_fn)(void);
-
-
-/**
- * @brief Function pointer type for GPIO deinitialization.
- */
-typedef void (*gpio_deinit_fn)(void);
-
-/**
- * @brief Abstract GPIO handle with callback operations.
- */
-typedef void (*gpio_error_fn)(gpio_error_t);
 
 /**
- * @brief Abstract GPIO handle with callback operations.
+ * @brief Internal function pointer table used by platform implementations.
  */
 typedef struct {
-    gpio_write_fn set;
+    fn_ptr_gpio_write   set;
-    gpio_read_fn read;
+    fn_ptr_gpio_read    read;
-    gpio_toggle_fn toggle;
+    fn_ptr_gpio_toggle  toggle;
-    gpio_deinit_fn deinit;      /**< Deinitialization function pointer */
+    fn_ptr_gpio_update  update;
-    gpio_error_fn on_error;     /**< Error handling callback */
+    fn_ptr_gpio_error   on_error;
-} gpio_t;
+} gpio_fn_ptr_t;
-
+
-/**
+/* === Platform-specific types === */
- * @brief Function pointer type for platform-specific GPIO initialization.
+typedef struct gpio_s gpio_t;
- */
-typedef gpio_error_t (*gpio_init_fn)(gpio_t* gpio, const void* config);
-
 #ifdef KED_USES_LINUX
-/**
+/** GPIO configuration structure for Linux */
- * @brief Platform-specific GPIO configuration structure for Linux.
+struct gpio_s {
- */
-typedef struct {
     const char* chipname;
     unsigned int line_offset;
-    gpio_mode_t mode;
+    gpio_function_t mode;
     gpio_direction_t direction;
     gpio_bias_t bias;
-} gpio_config;
+    gpio_status_t status;
+};
 #endif
 
+/* === Public API === */
+
 /**
  * @brief Initialize a GPIO using the specified configuration.
  *
  * @param gpio Pointer to target gpio_t handle
- * @param config Platform-specific GPIO configuration struct
  * @return GPIO_OK on success, or an appropriate gpio_error_t
  */
-gpio_error_t ked_gpio_init(gpio_t* gpio, const gpio_config* config);
+gpio_error_t ked_gpio_init(gpio_t* gpio, const gpio_fn_ptr_t* callbacks);
 
 /**
  * @brief Deinitialize and release resources associated with a GPIO pin.
+ *
+ * @param gpio Pointer to GPIO object
  */
-void ked_gpio_deinit(gpio_t* gpio);
+void ked_gpio_deinit(gpio_t* gpio, const gpio_fn_ptr_t* callbacks);
+
+/* === Platform-agnostic GPIO control interface === */
+
+#ifdef __cplusplus
+}
+#endif
 
-#endif /* KED_PERIPHERALS_GPIO_GPIO_H_ */
+#endif /* KED_PERIPHERALS_GPIO_H_ */

peripherals/gpio/gpio.c

@@ -1,139 +1,163 @@
 /**
  * @file gpio_linux.c
- * @brief GPIO implementation for Linux using libgpiod and KED callback injection.
+ * @brief GPIO implementation for Linux using libgpiod and KED function pointer injection.
  */
 
 #include "../../ked/peripherals/gpio/gpio.h"
 #include <gpiod.h>
 #include <stdlib.h>
 #include <stdio.h>
+#include <string.h>
 
 /**
  * @brief Internal Linux GPIO context.
  *
- * Holds pointers to the open GPIO chip and the requested line.
+ * Holds the active chip and line handles.
+ * This implementation assumes one active GPIO at a time (can be extended to multiple if needed).
  */
 typedef struct {
-    struct gpiod_chip* chip; /**< File descriptor to the opened GPIO chip */
+    struct gpiod_chip* chip;
-    struct gpiod_line* line; /**< Reference to the requested GPIO line */
+    struct gpiod_line* line;
 } gpio_linux_ctx_t;
 
 static gpio_linux_ctx_t gpio_ctx;
 
+/* === Centralized Error Handling === */
+
 /**
- * @brief Set the output level of the GPIO line.
+ * @brief Centralized error handler for GPIO-related failures.
+ *
+ * Logs the error to stderr and can be extended to trigger hooks or diagnostics.
  *
- * @param value Logic level to set (true for HIGH, false for LOW).
+ * @param err The GPIO error code encountered.
  */
-static void gpio_linux_set(bool value) {
+static void gpio_linux_handle_error(gpio_error_t err) {
-    gpiod_line_set_value(gpio_ctx.line, value);
+    fprintf(stderr, "[GPIO/Linux] ERROR: %d\n", err);
+    // Future: report to diagnostic logger or panic handler
 }
 
+/* === GPIO Operation Implementations === */
+
 /**
- * @brief Read the current logic level of the GPIO line.
+ * @brief Set the output level of the GPIO line.
  *
- * @return Logic level (true for HIGH, false for LOW).
+ * @param value 1 = HIGH, 0 = LOW
  */
-static bool gpio_linux_read(void) {
+static void gpio_linux_set(uint8_t value) {
-    return gpiod_line_get_value(gpio_ctx.line);
+    if (gpio_ctx.line) {
+        gpiod_line_set_value(gpio_ctx.line, value);
+    } else {
+        gpio_linux_handle_error(T_GPIO_ERR_NOT_AVAILABLE);
+    }
 }
 
 /**
- * @brief Toggle the current state of the GPIO output.
+ * @brief Read the current logic level of the GPIO line.
+ *
+ * @return Logic level (1 = HIGH, 0 = LOW)
  */
-static void gpio_linux_toggle(void) {
+static uint8_t gpio_linux_read(void) {
-    int current = gpiod_line_get_value(gpio_ctx.line);
+    if (!gpio_ctx.line) {
-    gpiod_line_set_value(gpio_ctx.line, !current);
+        gpio_linux_handle_error(T_GPIO_ERR_NOT_AVAILABLE);
+        return 0;
+    }
+    return (uint8_t)gpiod_line_get_value(gpio_ctx.line);
 }
 
 /**
- * @brief Release the GPIO line and chip.
+ * @brief Toggle the current logic level of the GPIO line.
- *
- * Called during deinitialization to free resources.
  */
-static void gpio_linux_deinit(void) {
+static void gpio_linux_toggle(void) {
-    if (gpio_ctx.line) {
+    if (!gpio_ctx.line) {
-        gpiod_line_release(gpio_ctx.line);
+        gpio_linux_handle_error(T_GPIO_ERR_NOT_AVAILABLE);
-        gpio_ctx.line = NULL;
+        return;
-    }
-    if (gpio_ctx.chip) {
-        gpiod_chip_close(gpio_ctx.chip);
-        gpio_ctx.chip = NULL;
     }
+    uint8_t current = (uint8_t)gpiod_line_get_value(gpio_ctx.line);
+    gpiod_line_set_value(gpio_ctx.line, !current);
 }
 
 /**
- * @brief Default error handling function.
+ * @brief Update GPIO configuration dynamically.
  *
- * @param err The GPIO error code to report.
+ * Currently not supported on Linux – placeholder only.
  */
-static void gpio_linux_handle_error(gpio_error_t err) {
+static gpio_error_t gpio_linux_update(void) {
-    fprintf(stderr, "[GPIO ERROR] Code: %d\n", err);
+    // TODO: implement runtime reconfiguration if needed
+    return T_GPIO_ERR_UNSUPPORTED_MODE;
 }
 
+/* === Public API Implementation === */
+
 /**
- * @brief Initialize a GPIO using a Linux-specific gpio_config.
+ * @brief Initialize the GPIO using the given Linux gpio_t config and callback struct.
  *
- * Sets the direction and bias of the line according to the config.
+ * This sets direction, bias, and binds callbacks to the gpio_fn_ptr_t table.
  *
- * @param gpio Pointer to a gpio_t handle to be configured.
+ * @param gpio Pointer to GPIO configuration structure
- * @param config Pointer to a Linux-specific gpio_config structure.
+ * @param callbacks Optional pointer to gpio_fn_ptr_t to receive platform-specific handlers
- * @return GPIO_OK on success or an appropriate gpio_error_t on failure.
+ * @return T_GPIO_ERR_OK on success, or appropriate error code
  */
-gpio_error_t ked_gpio_init(gpio_t* gpio, const gpio_config* config) {
+gpio_error_t ked_gpio_init(gpio_t* gpio, const gpio_fn_ptr_t* callbacks) {
-    gpio_ctx.chip = gpiod_chip_open(config->chipname);
+    gpio_ctx.chip = gpiod_chip_open(gpio->chipname);
     if (!gpio_ctx.chip) {
-        gpio->on_error(GPIO_ERR_NOT_AVAILABLE);
+        gpio_linux_handle_error(T_GPIO_ERR_NOT_AVAILABLE);
-        return GPIO_ERR_NOT_AVAILABLE;
+        return T_GPIO_ERR_NOT_AVAILABLE;
     }
 
-    gpio_ctx.line = gpiod_chip_get_line(gpio_ctx.chip, config->line_offset);
+    gpio_ctx.line = gpiod_chip_get_line(gpio_ctx.chip, gpio->line_offset);
     if (!gpio_ctx.line) {
         gpiod_chip_close(gpio_ctx.chip);
-        gpio->on_error(GPIO_ERR_NOT_AVAILABLE);
+        gpio_linux_handle_error(T_GPIO_ERR_NOT_AVAILABLE);
-        return GPIO_ERR_NOT_AVAILABLE;
+        return T_GPIO_ERR_NOT_AVAILABLE;
     }
 
     struct gpiod_line_request_config req_cfg = {
-        .consumer = "ked",
+        .consumer = "ked_gpio",
-        .request_type = (config->direction == GPIO_DIRECTION_OUTPUT)
+        .request_type = (gpio->direction == T_GPIO_DIRECTION_OUTPUT)
             ? GPIOD_LINE_REQUEST_DIRECTION_OUTPUT
             : GPIOD_LINE_REQUEST_DIRECTION_INPUT,
         .flags = 0
     };
 
-    if (config->bias == GPIO_BIAS_PULL_UP) {
+    if (gpio->bias == T_GPIO_BIAS_PULL_UP)
         req_cfg.flags |= GPIOD_LINE_REQUEST_FLAG_BIAS_PULL_UP;
-    } else if (config->bias == GPIO_BIAS_PULL_DOWN) {
+    else if (gpio->bias == T_GPIO_BIAS_PULL_DOWN)
         req_cfg.flags |= GPIOD_LINE_REQUEST_FLAG_BIAS_PULL_DOWN;
-    } else if (config->bias == GPIO_BIAS_DISABLE) {
+    else if (gpio->bias == T_GPIO_BIAS_DISABLE)
         req_cfg.flags |= GPIOD_LINE_REQUEST_FLAG_BIAS_DISABLE;
-    } else if (config->bias == GPIO_BIAS_NONE) {
+    else if (gpio->bias == T_GPIO_BIAS_DEFAULT)
         req_cfg.request_type = GPIOD_LINE_REQUEST_DIRECTION_AS_IS;
-    }
 
     if (gpiod_line_request(gpio_ctx.line, &req_cfg, 0) < 0) {
         gpiod_chip_close(gpio_ctx.chip);
-        gpio->on_error(GPIO_ERR_LINE_BUSY);
+        gpio_linux_handle_error(T_GPIO_ERR_BUS_BUSY);
-        return GPIO_ERR_LINE_BUSY;
+        return T_GPIO_ERR_BUS_BUSY;
     }
 
-    gpio->set = gpio_linux_set;
+    if (callbacks) {
-    gpio->read = gpio_linux_read;
+        ((gpio_fn_ptr_t*)callbacks)->set      = gpio_linux_set;
-    gpio->toggle = gpio_linux_toggle;
+        ((gpio_fn_ptr_t*)callbacks)->read     = gpio_linux_read;
-    gpio->deinit = gpio_linux_deinit;
+        ((gpio_fn_ptr_t*)callbacks)->toggle   = gpio_linux_toggle;
-    gpio->on_error = gpio_linux_handle_error;
+        ((gpio_fn_ptr_t*)callbacks)->update   = gpio_linux_update;
+        ((gpio_fn_ptr_t*)callbacks)->on_error = gpio_linux_handle_error;
+    }
 
-    return GPIO_OK;
+    return T_GPIO_ERR_OK;
 }
 
 /**
- * @brief Generic GPIO deinitialization entry point.
+ * @brief Deinitialize GPIO from platform and free resources.
  *
- * @param gpio Pointer to the gpio_t structure with deinit function populated.
+ * @param gpio Unused in this implementation
+ * @param callbacks Pointer to callback table that includes `deinit`
  */
-void ked_gpio_deinit(gpio_t* gpio) {
+void ked_gpio_deinit(gpio_t* gpio, const gpio_fn_ptr_t* callbacks) {
-    if (gpio && gpio->deinit) {
+    if (gpio_ctx.line) {
-        gpio->deinit();
+        gpiod_line_release(gpio_ctx.line);
+        gpio_ctx.line = NULL;
+    }
+    if (gpio_ctx.chip) {
+        gpiod_chip_close(gpio_ctx.chip);
+        gpio_ctx.chip = NULL;
     }
 }