swig: add unexport() calls to be used by destructors in object api

Signed-off-by: Brendan Le Foll <brendan.le.foll@intel.com>

api/gpio.h

@@ -101,7 +101,7 @@ maa_result_t maa_gpio_mode(maa_gpio_context *dev, gpio_mode_t mode);
 maa_result_t maa_gpio_dir(maa_gpio_context *dev, gpio_dir_t dir);
 
 /** Close the GPIO context
- * - Will free the memory for the context.
+ * - Will free the memory for the context and unexport the GPIO
  *
  * @param dev the GPIO context
  *
@@ -109,6 +109,14 @@ maa_result_t maa_gpio_dir(maa_gpio_context *dev, gpio_dir_t dir);
  */
 maa_result_t maa_gpio_close(maa_gpio_context *dev);
 
+/** Unexport the GPIO context (maa_gpio_close() will call this function)
+ *
+ * @param dev The GPIO context.
+ *
+ * @return maa result type.
+ */
+maa_result_t maa_gpio_unexport(maa_gpio_context *dev);
+
 /** Read the GPIO value.
  *
  * @param dev The GPIO context.

api/pwm.h

@@ -151,6 +151,14 @@ maa_result_t maa_pwm_pulsewidth_us(maa_pwm_context* pwm, int us);
  */
 maa_result_t maa_pwm_enable(maa_pwm_context* pwm, int enable);
 
+/** Unexport the PWM context (maa_pwm_close() will call this function)
+ *
+ * @param dev The PWM context/
+ *
+ * @return maa result type.
+ */
+maa_result_t maa_pwm_unexport(maa_pwm_context* pwm);
+
 /** Close and unexport the PWM pin.
  * 
  * @param pwm The PWM context to use.

src/gpio/gpio.c

@@ -158,16 +158,20 @@ maa_gpio_write(maa_gpio_context *dev, int value)
     if (dev->value_fp == NULL) {
         maa_gpio_get_valfp(dev);
     }
-    fseek(dev->value_fp, SEEK_SET, 0);
+    if (fseek(dev->value_fp, SEEK_SET, 0) != 0) {
+        return MAA_ERROR_INVALID_RESOURCE;
+    }
     fprintf(dev->value_fp, "%d", value);
-    fseek(dev->value_fp, SEEK_SET, 0);
+    if (fseek(dev->value_fp, SEEK_SET, 0) != 0) {
+        return MAA_ERROR_INVALID_RESOURCE;
+    }
     if (ferror(dev->value_fp) != 0)
         return MAA_ERROR_INVALID_RESOURCE;
     return MAA_SUCCESS;
 }
 
 maa_result_t
-maa_gpio_close(maa_gpio_context *dev)
+maa_gpio_unexport(maa_gpio_context *dev)
 {
     FILE *unexport_f;
 
@@ -179,6 +183,12 @@ maa_gpio_close(maa_gpio_context *dev)
     fclose(unexport_f);
     if (ferror(dev->value_fp) != 0)
         return MAA_ERROR_INVALID_RESOURCE;
+}
+
+maa_result_t
+maa_gpio_close(maa_gpio_context *dev)
+{
+    maa_gpio_unexport(dev);
     free(dev);
     return MAA_SUCCESS;
 }

src/maa.i

@@ -55,7 +55,7 @@ typedef struct {
   }
   ~maa_gpio_context()
   {
-    maa_gpio_close($self);
+    maa_gpio_unexport($self);
   }
   %feature("autodoc") write "
   Write a value to a GPIO pin
@@ -118,7 +118,6 @@ typedef struct {
   }
   ~maa_i2c_context()
   {
-    maa_i2c_stop($self);
   }
   int frequency(int hz)
   {
@@ -167,7 +166,7 @@ typedef struct {
   }
   ~maa_pwm_context()
   {
-    maa_pwm_close($self);
+    maa_pwm_unexport($self);
   }
   int write(float percentage)
   {
@@ -226,7 +225,6 @@ typedef struct {
   }
   ~maa_spi_context()
   {
-    maa_spi_stop($self);
   }
   int mode(unsigned short mode)
   {
@@ -260,7 +258,6 @@ typedef struct {
   }
   ~maa_aio_context()
   {
-    maa_aio_close($self);
   }
   unsigned int read()
   {

src/pwm/pwm.c

@@ -205,8 +205,9 @@ maa_pwm_enable(maa_pwm_context* dev, int enable)
 }
 
 maa_result_t
-maa_pwm_close(maa_pwm_context* dev)
+maa_pwm_unexport(maa_pwm_context* dev)
 {
+    // disable pwm before unexporting
     maa_pwm_enable(dev, 0);
     FILE *unexport_f;
     char buffer[64];
@@ -218,8 +219,14 @@ maa_pwm_close(maa_pwm_context* dev)
     }
     fprintf(unexport_f, "%d", dev->pin);
     fclose(unexport_f);
-    free(dev);
     if (ferror(unexport_f) != 0)
         return MAA_ERROR_INVALID_RESOURCE;
+}
+
+maa_result_t
+maa_pwm_close(maa_pwm_context* dev)
+{
+    maa_pwm_unexport(dev);
+    free(dev);
     return MAA_SUCCESS;
 }