i2c: Work started on using pinmap with i2c

* Update examples and swig interface.

Signed-off-by: Thomas Ingleby <thomas.c.ingleby@intel.com>

api/i2c.h

@@ -54,9 +54,10 @@ typedef struct {
 
 /** Initialise i2c context, using board defintions
  *
+ * @param bus i2c bus to use
  * @return maa_i2c_context i2c context ready for other calls.
  */
-maa_i2c_context* maa_i2c_init();
+maa_i2c_context* maa_i2c_init(int bus);
 
 /** Initialise i2c context, passing in spi bus to use.
  *

api/maa.h

@@ -138,7 +138,11 @@ unsigned int maa_check_gpio(int pin);
  */
 unsigned int maa_check_aio(int pin);
 
-//unsigned int maa_check_pwm(int pin);
+/** Check i2c interface, sets up multiplexer on device.
+ *
+ * @return unsigned int if using /dev/i2c-2 returned would be 2
+ */
+unsigned int maa_check_i2c();
 
 /** Get the version string of maa autogenerated from git tag
  *

examples/i2c_HMC5883L.c

@@ -84,7 +84,7 @@ main(int argc, char **argv)
     char rx_tx_buf[MAX_BUFFER_LENGTH];
 
     maa_i2c_context *i2c;
-    i2c = maa_i2c_init();
+    i2c = maa_i2c_init(0);
 
     maa_i2c_address(i2c, HMC5883L_I2C_ADDR);
     rx_tx_buf[0] = HMC5883L_CONF_REG_B;

src/i2c/i2c.c

@@ -26,16 +26,41 @@
 #include "smbus.h"
 
 maa_i2c_context*
-maa_i2c_init()
+maa_i2c_init(int bus)
 {
+    unsigned int checked_pin = maa_check_i2c(bus);
+    if (checked_pin < 0) {
+        switch(checked_pin) {
+            case -1:
+                fprintf(stderr, "No i2c on board\n");
+                return NULL;
+            case -2:
+                fprintf(stderr, "Failed to set-up i2c multiplexer!\n");
+                return NULL;
+            case -3:
+                fprintf(stderr, "Platform Not Initialised");
+                return NULL;
+            default: return NULL;
+        }
+    }
+    return maa_i2c_init_raw(checked_pin);
+}
+
+maa_i2c_context*
+maa_i2c_init_raw(unsigned int bus)
+{
+    if (bus < 0) {
+        fprintf(stderr, "Bus -%u- bellow zero\n", bus);
+        return NULL;
+    }
     maa_i2c_context* dev = (maa_i2c_context*) malloc(sizeof(maa_i2c_context));
     if (dev == NULL)
         return NULL;
 
-    // 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");
+    char filepath[32];
+    snprintf(filepath, 32, "/dev/i2c-%u", bus);
+    if ((dev->fh = open(filepath, O_RDWR)) < 1) {
+        fprintf(stderr, "Failed to open requested i2c port %s", filepath);
     }
     return dev;
 }

src/intel_galileo_rev_d.c

@@ -200,5 +200,27 @@ maa_intel_galileo_rev_d()
     b->pins[19].mux[1].pin = 20;
     b->pins[19].mux[1].value = 0;
 
+    strncpy(b->pins[20].name, "I2C", 8);
+    b->pins[20].pin = 0;
+    b->pins[20].parent_id = 0;
+    b->pins[20].capabilites = (maa_pincapabilities_t) {1,1,0,0,0,1,1};
+    b->pins[20].mux_total = 1;
+    b->pins[20].mux[0].pin = 29;
+    b->pins[20].mux[0].value = 0;
+
+    strncpy(b->pins[21].name, "SPI-1.0", 8);
+    b->pins[21].pin = 1;
+    b->pins[21].parent_id = 0;
+    b->pins[21].capabilites = (maa_pincapabilities_t) {1,1,0,0,0,1,1};
+    b->pins[21].mux_total = 4;
+    b->pins[21].mux[0].pin = 42;
+    b->pins[21].mux[0].value = 0;
+    b->pins[21].mux[1].pin = 43;
+    b->pins[21].mux[1].value = 0;
+    b->pins[21].mux[2].pin = 54;
+    b->pins[21].mux[2].value = 0;
+    b->pins[21].mux[3].pin = 55;
+    b->pins[21].mux[3].value = 0;
+
     return b;
 }

src/maa.c

@@ -97,3 +97,22 @@ maa_check_aio(int aio)
 
     return plat->pins[pin].pin;
 }
+
+unsigned int
+maa_check_i2c(int bus)
+{
+    if (plat == NULL)
+        return -3;
+
+    if (plat->i2c_bus_count >! 0) {
+        fprintf(stderr, "No i2c buses defined in platform");
+        return -1;
+    }
+    int pin = (plat->gpio_count + plat->aio_count) + bus;
+
+    if (plat->pins[pin].mux_total > 0)
+        if (maa_setup_mux_mapped(plat->pins[pin]) != MAA_SUCCESS)
+            return -2;
+
+    return plat->pins[pin].pin;
+}

src/maa.i

@@ -67,7 +67,7 @@ typedef struct {
 %extend maa_i2c_context {
   maa_i2c_context()
   {
-    return maa_i2c_init();
+    return maa_i2c_init(0);
   }
   ~maa_i2c_context()
   {