maa: change the linking of maa and make gpio functions match maa_ spec

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

api/gpio.h

@@ -20,8 +20,9 @@
 
 #include <stdio.h>
 
-typedef struct gpio_struct
+#include "maa.h"
-{
+
+typedef struct {
     int pin;
     int pinMap;
     char path[64];
@@ -31,11 +32,11 @@ typedef struct gpio_struct
 typedef char gpio_mode_t[16];
 typedef char gpio_dir_t[16];
 
-void gpio_init(gpio_t *gpio, int pin);
+maa_result_t maa_gpio_init(gpio_t *gpio, int pin);
-int gpio_set(int pin);
+int maa_gpio_set(int pin);
-void gpio_mode(gpio_t *gpio, gpio_mode_t mode);
+void maa_gpio_mode(gpio_t *gpio, gpio_mode_t mode);
-void gpio_dir(gpio_t *gpio, gpio_dir_t dir);
+void maa_gpio_dir(gpio_t *gpio, gpio_dir_t dir);
 
-void gpio_close(gpio_t *gpio);
+void maa_gpio_close(gpio_t *gpio);
-int gpio_read(gpio_t *gpio);
+int maa_gpio_read(gpio_t *gpio);
-void gpio_write(gpio_t *gpio, int value);
+void maa_gpio_write(gpio_t *gpio, int value);

api/i2c.h

@@ -21,6 +21,8 @@
 #include <stdlib.h>
 #include <stdio.h>
 #include <fcntl.h>
+
+#include "maa.h"
 #include "gpio.h"
 
 typedef struct {
@@ -30,7 +32,7 @@ typedef struct {
     gpio_t gpio;
 } i2c_t;
 
-int maa_i2c_init(i2c_t* dev);
+maa_result_t maa_i2c_init(i2c_t* dev);
 
 /** Set the frequency of the I2C interface
  *

api/maa.h

@@ -24,10 +24,21 @@
 
 #pragma once
 
-#include "i2c.h"
-#include "gpio.h"
-#include "pwm.h"
-
 #define MAA_LIBRARY_VERSION 1
 
-int maa_get_version();
+typedef enum {
+    MAA_SUCCESS                              =  0,
+    MAA_ERROR_FEATURE_NOT_IMPLEMENTED        =  1,
+    MAA_ERROR_FEATURE_NOT_SUPPORTED          =  2,
+    MAA_ERROR_INVALID_VERBOSITY_LEVEL        =  3,
+    MAA_ERROR_INVALID_PARAMETER              =  4,
+    MAA_ERROR_INVALID_HANDLE                 =  5,
+    MAA_ERROR_NO_RESOURCES                   =  6,
+    MAA_ERROR_INVALID_RESOURCE               =  7,
+    MAA_ERROR_INVALID_QUEUE_TYPE             =  8,
+    MAA_ERROR_NO_DATA_AVAILABLE              =  9,
+
+    MAA_ERROR_UNSPECIFIED                    = 99
+} maa_result_t;
+
+maa_result_t maa_get_version();

api/pwm.h

@@ -21,12 +21,14 @@
 #include <stdio.h>
 #include <fcntl.h>
 
+#include "maa.h"
+
 typedef struct {
     int chipid, pin;
     FILE *duty_fp;
 } pwm_t;
 
-int maa_pwm_init(pwm_t* pwm, int chipin, int pin);
+maa_result_t maa_pwm_init(pwm_t* pwm, int chipin, int pin);
 
 /** Set the ouput duty-cycle percentage, as a float
  *

examples/CMakeLists.txt

@@ -1,9 +1,11 @@
 add_executable (i2c_HMC5883L i2c_HMC5883L.c)
 add_executable (hellomaa hellomaa.c)
 add_executable (cycle-pwm3 cycle-pwm3.c)
+add_executable (blink-io8 blink-io8.c)
 
 include_directories(${PROJECT_SOURCE_DIR}/api ${PROJECT_SOURCE_DIR}/include)
 
 target_link_libraries (hellomaa maa)
 target_link_libraries (i2c_HMC5883L maa m)
 target_link_libraries (cycle-pwm3 maa)
+target_link_libraries (blink-io8 maa)

examples/blink-io8.c

@@ -24,20 +24,20 @@
 
 #include "stdio.h"
 
-#include "maa.h"
+#include "gpio.h"
 
 int
 main(int argc, char **argv)
 {
-    fprintf(stdout, "MAA Version: %d\n Starting Blinking on IO8", get_version());
+    fprintf(stdout, "MAA Version: %d\n Starting Blinking on IO8", maa_get_version());
     gpio_t gpio;
-    gpio_init(&gpio, 26);
+    maa_gpio_init(&gpio, 26);
-    gpio_dir(&gpio, "out");
+    maa_gpio_dir(&gpio, "out");
 
     while (1){
-        gpio_write(&gpio, 0);
+        maa_gpio_write(&gpio, 0);
         sleep(1);
-        gpio_write(&gpio, 1);
+        maa_gpio_write(&gpio, 1);
         sleep(1);
     }
     return 0;

examples/cycle-pwm3.c

@@ -24,7 +24,7 @@
 
 #include <unistd.h>
 
-#include "maa.h"
+#include "pwm.h"
 
 int
 main ()

examples/i2c_HMC5883L.c

@@ -22,7 +22,7 @@
  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  */
 
-#include "maa.h"
+#include "i2c.h"
 #include "math.h"
 
 #define MAX_BUFFER_LENGTH 6

src/CMakeLists.txt

@@ -5,9 +5,9 @@ include_directories(
 
 set (maa_LIB_HEADERS
   ${PROJECT_SOURCE_DIR}/api/maa.h
+  ${PROJECT_SOURCE_DIR}/api/gpio.h
   ${PROJECT_SOURCE_DIR}/api/i2c.h
   ${PROJECT_SOURCE_DIR}/api/pwm.h
-  ${PROJECT_SOURCE_DIR}/api/gpio.h
   ${PROJECT_SOURCE_DIR}/include/smbus.hpp
   ${PROJECT_SOURCE_DIR}/include/smbus.h
 )
@@ -21,9 +21,9 @@ set (maa_LIB_KERNEL
 
 set (maa_LIB_SRCS
   ${PROJECT_SOURCE_DIR}/src/maa.c
+  ${PROJECT_SOURCE_DIR}/src/gpio/gpio.c
   ${PROJECT_SOURCE_DIR}/src/i2c/i2c.c
   ${PROJECT_SOURCE_DIR}/src/i2c/smbus.c
-  ${PROJECT_SOURCE_DIR}/src/gpio/gpio.c
   ${PROJECT_SOURCE_DIR}/src/pwm/pwm.c
 )
 

src/gpio/gpio.c

@@ -29,12 +29,8 @@
 
 #include "gpio.h"
 
-#ifdef __cplusplus
-extern "C" {
-#endif
-
 static int
-gpio_get_valfp(gpio_t *gpio)
+maa_gpio_get_valfp(gpio_t *gpio)
 {
     char bu[64];
     sprintf(bu, "/sys/class/gpio/gpio%d/value", gpio->pin);
@@ -45,8 +41,8 @@ gpio_get_valfp(gpio_t *gpio)
     return 0;
 }
 
-void
+maa_result_t
-gpio_init(gpio_t *gpio, int pin)
+maa_gpio_init(gpio_t *gpio, int pin)
 {
     FILE *export_f;
 
@@ -57,23 +53,24 @@ gpio_init(gpio_t *gpio, int pin)
         fclose(export_f);
     }
     gpio->pin = pin;
+    return MAA_SUCCESS;
 }
 
 int
-gpio_set(int pin)
+maa_gpio_set(int pin)
 {
     //Stuff
     return 0;
 }
 
 void
-gpio_mode(gpio_t *gpio, gpio_mode_t mode)
+maa_gpio_mode(gpio_t *gpio, gpio_mode_t mode)
 {
     //gpio->pin
 }
 
 void
-gpio_dir(gpio_t *gpio, gpio_dir_t dir)
+maa_gpio_dir(gpio_t *gpio, gpio_dir_t dir)
 {
     if (gpio->value_fp != NULL) {
          gpio->value_fp = NULL;
@@ -92,10 +89,10 @@ gpio_dir(gpio_t *gpio, gpio_dir_t dir)
 }
 
 int
-gpio_read(gpio_t *gpio)
+maa_gpio_read(gpio_t *gpio)
 {
     if (gpio->value_fp == NULL) {
-        gpio_get_valfp(gpio);
+        maa_gpio_get_valfp(gpio);
     }
     fseek(gpio->value_fp, SEEK_SET, 0);
     char buffer[2];
@@ -105,10 +102,10 @@ gpio_read(gpio_t *gpio)
 }
 
 void
-gpio_write(gpio_t *gpio, int value)
+maa_gpio_write(gpio_t *gpio, int value)
 {
     if (gpio->value_fp == NULL) {
-        gpio_get_valfp(gpio);
+        maa_gpio_get_valfp(gpio);
     }
     fseek(gpio->value_fp, SEEK_SET, 0);
     fprintf(gpio->value_fp, "%d", value);
@@ -117,7 +114,7 @@ gpio_write(gpio_t *gpio, int value)
 }
 
 void
-gpio_close(gpio_t *gpio)
+maa_gpio_close(gpio_t *gpio)
 {
     FILE *unexport_f;
 
@@ -128,7 +125,3 @@ gpio_close(gpio_t *gpio)
         fclose(unexport_f);
     }
 }
-
-#ifdef __cplusplus
-}
-#endif

src/i2c/i2c.c

@@ -25,16 +25,20 @@
 #include "i2c.h"
 #include "smbus.h"
 
-int
+maa_result_t
 maa_i2c_init(i2c_t* dev)
 {
     // maa allocates the memory for *dev
     dev = malloc(sizeof *dev);
+    if (!dev)
+        return MAA_ERROR_NO_RESOURCES;
+
     // Galileo only has one I2C master which should be /dev/i2c-0
     // reliability is a fickle friend!
     if ((dev->fh = open("/dev/i2c-0", O_RDWR)) < 1) {
         fprintf(stderr, "Failed to open requested i2c port");
     }
+    return MAA_SUCCESS;
 }
 
 void

src/maa.c

@@ -24,7 +24,7 @@
 
 #include "maa.h"
 
-int
+maa_result_t
 maa_get_version()
 {
     return MAA_LIBRARY_VERSION;

src/maa.i

@@ -1,8 +1,11 @@
 %{
     #include "maa.h"
+    #include "gpio.h"
+    #include "pwm.h"
+    #include "i2c.h"
 %}
 
 %include "maa.h"
-%include "i2c.h"
 %include "gpio.h"
 %include "pwm.h"
+%include "i2c.h"

src/pwm/pwm.c

@@ -91,10 +91,13 @@ maa_pwm_get_duty(pwm_t* dev)
     fseek(dev->duty_fp, SEEK_SET, 0);
     return atoi(output);
 }
-int
+
+maa_result_t
 maa_pwm_init(pwm_t* dev, int chipin, int pin)
 {
     dev = malloc(sizeof *dev);
+    if (!dev)
+        return MAA_ERROR_NO_RESOURCES;
     dev->chipid = chipin;
     dev->pin = pin;
 
@@ -104,13 +107,14 @@ maa_pwm_init(pwm_t* dev, int chipin, int pin)
 
     if ((export_f = fopen(buffer, "w")) == NULL) {
         fprintf(stderr, "Failed to open export for writing!\n");
+	return MAA_ERROR_INVALID_HANDLE;
     } else {
         fprintf(export_f, "%d", dev->pin);
         fclose(export_f);
         maa_pwm_setup_duty_fp(dev);
     }
 
-    return 0;
+    return MAA_SUCCESS;
 }
 
 void