pwm: Use pinmap functions for setting up pwm.

* Intended function of check_pwm also checks for conflicting gpio, due
* to quirk on galileo rev d, functionality commented.

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

api/maa.h

@@ -185,6 +185,15 @@ unsigned int maa_check_aio(int pin);
  */
 unsigned int maa_check_i2c();
 
+/** Check PWM
+ *
+ * Will check input is valid for pwm and will also setup required multiplexers.
+ * IF the pin also does gpio (strong chance), DO NOTHING, REV D is strange.
+ * @param pin the pin as read from the board surface.
+ * @return the pwm pin_info_t of that IO pin
+ */
+maa_pin_t* maa_check_pwm(int pin);
+
 /** Get the version string of maa autogenerated from git tag
  *
  * The version returned may not be what is expected however it is a reliable

src/maa.c

@@ -24,6 +24,7 @@
  */
 
 #include <stddef.h>
+#include <stdlib.h>
 
 #include "maa.h"
 #include "intel_galileo_rev_d.h"
@@ -98,14 +99,13 @@ maa_check_aio(int aio)
 
     int pin = aio + plat->gpio_count;
 
-    if(plat->pins[pin].capabilites.aio != 1)
+    if (plat->pins[pin].capabilites.aio != 1)
       return -1;
 
     if (plat->pins[pin].aio.mux_total > 0)
        if (maa_setup_mux_mapped(plat->pins[pin].aio) != MAA_SUCCESS)
             return -1;
     return plat->pins[pin].aio.pinmap;
-
 }
 
 unsigned int
@@ -132,3 +132,37 @@ maa_check_i2c(int bus_s)
 
     return plat->i2c_bus[bus].bus_id;
 }
+
+maa_pin_t*
+maa_check_pwm(int pin)
+{
+    if (plat == NULL)
+        return NULL;
+
+    if (plat->pins[pin].capabilites.pwm != 1)
+      return NULL;
+
+   /** quirk in rev d, this messes with pwm on that pin
+   * if (plat->pins[pin].capabilites.gpio == 1) {
+   *     maa_gpio_context* mux_i;
+   *     mux_i = maa_gpio_init_raw(plat->pins[pin].gpio.pinmap);
+   *     if (mux_i == NULL)
+   *         return NULL;
+   *     if (maa_gpio_dir(mux_i, MAA_GPIO_OUT) != MAA_SUCCESS)
+   *         return NULL;
+   *     if (maa_gpio_write(mux_i, 0) != MAA_SUCCESS)
+   *         return NULL;
+   *     if (maa_gpio_close(mux_i) != MAA_SUCCESS)
+   *         return NULL;
+   * }
+    */
+    if (plat->pins[pin].pwm.mux_total > 0)
+       if (maa_setup_mux_mapped(plat->pins[pin].pwm) != MAA_SUCCESS)
+            return NULL;
+
+    maa_pin_t *ret;
+    ret = (maa_pin_t*) malloc(sizeof(maa_pin_t));
+    ret->pinmap = plat->pins[pin].pwm.pinmap;
+    ret->parent_id = plat->pins[pin].pwm.parent_id;
+    return ret;
+}

src/pwm/pwm.c

@@ -101,8 +101,13 @@ maa_pwm_get_duty(maa_pwm_context* dev)
 
 maa_pwm_context*
 maa_pwm_init(int pin) {
-    //TODO
+    maa_pin_t* pinm = maa_check_pwm(pin);
-    return maa_pwm_init_raw(0, pin);
+    if (pinm == NULL)
+        return NULL;
+    int chip = pinm->parent_id;
+    int pinn = pinm->pinmap;
+    free(pinm);
+    return maa_pwm_init_raw(chip,pinn);
 }
 
 maa_pwm_context*
@@ -121,8 +126,8 @@ maa_pwm_init_raw(int chipin, int pin)
 
     if ((export_f = fopen(buffer, "w")) == NULL) {
         fprintf(stderr, "Failed to open export for writing!\n");
-	free(dev);
+        free(dev);
-	return NULL;
+        return NULL;
     } else {
         fprintf(export_f, "%d", dev->pin);
         fclose(export_f);