pwm: removed unused code and optimized flow for subplatform support

Signed-off-by: Mihai Tudor Panu <mihai.tudor.panu@intel.com>
Signed-off-by: Brendan Le Foll <brendan.le.foll@intel.com>

api/mraa/pwm.h

@@ -189,16 +189,18 @@ mraa_result_t mraa_pwm_config_percent(mraa_pwm_context dev, int period, float du
 /**
  * Get the maximum pwm period in us
  *
+ * @param dev The pwm context to use
  * @return max pwm in us
  */
-int mraa_pwm_get_max_period();
+int mraa_pwm_get_max_period(mraa_pwm_context dev);
 
 /**
  * Get the minimum pwm period in us
  *
+ * @param dev The pwm context to use
  * @return min pwm in us
  */
-int mraa_pwm_get_min_period();
+int mraa_pwm_get_min_period(mraa_pwm_context dev);
 
 #ifdef __cplusplus
 }

api/mraa/pwm.hpp

@@ -176,10 +176,7 @@ class Pwm
     Result
     enable(bool enable)
     {
-        if (enable)
-            return (Result) mraa_pwm_enable(m_pwm, 1);
-        else
-            return (Result) mraa_pwm_enable(m_pwm, 0);
+        return (Result) mraa_pwm_enable(m_pwm, enable);
     }
     /**
      * Set the period and duty of a PWM object.
@@ -213,7 +210,7 @@ class Pwm
     int
     max_period()
     {
-        return mraa_pwm_get_max_period();
+        return mraa_pwm_get_max_period(m_pwm);
     }
     /**
      * Get the minimum pwm period in us
@@ -223,7 +220,7 @@ class Pwm
     int
     min_period()
     {
-        return mraa_pwm_get_min_period();
+        return mraa_pwm_get_min_period(m_pwm);
     }
 
   private:

src/pwm/pwm.c

@@ -98,6 +98,10 @@ mraa_pwm_write_duty(mraa_pwm_context dev, int duty)
 static int
 mraa_pwm_read_period(mraa_pwm_context dev)
 {
+    if (IS_FUNC_DEFINED(dev, pwm_read_replace)) {
+        return dev->period;
+    }
+
     char bu[MAX_SIZE];
     char output[MAX_SIZE];
     snprintf(bu, MAX_SIZE, "/sys/class/pwm/pwmchip%d/pwm%d/period", dev->chipid, dev->pin);
@@ -134,6 +138,10 @@ mraa_pwm_read_period(mraa_pwm_context dev)
 static int
 mraa_pwm_read_duty(mraa_pwm_context dev)
 {
+    if (IS_FUNC_DEFINED(dev, pwm_read_replace)) {
+        return dev->advance_func->pwm_read_replace(dev);
+    }
+
     if (dev->duty_fp == -1) {
         if (mraa_pwm_setup_duty_fp(dev) == 1) {
             return MRAA_ERROR_INVALID_HANDLE;
@@ -316,9 +324,6 @@ mraa_pwm_write(mraa_pwm_context dev, float percentage)
 float
 mraa_pwm_read(mraa_pwm_context dev)
 {
-    if (IS_FUNC_DEFINED(dev, pwm_read_replace)) {
-        return dev->advance_func->pwm_read_replace(dev);
-    }
     int period = mraa_pwm_read_period(dev);
     if (period > 0) {
         return (mraa_pwm_read_duty(dev) / (float) period);
@@ -341,7 +346,15 @@ mraa_pwm_period_ms(mraa_pwm_context dev, int ms)
 mraa_result_t
 mraa_pwm_period_us(mraa_pwm_context dev, int us)
 {
-    if (us < plat->pwm_min_period || us > plat->pwm_max_period) {
+    int min, max;
+    if (mraa_is_sub_platform_id(dev->chipid)) {
+        min = plat->sub_platform->pwm_min_period;
+        max = plat->sub_platform->pwm_max_period;
+    } else {
+        min = plat->pwm_min_period;
+        max = plat->pwm_max_period;
+    }
+    if (us < min || us > max) {
         syslog(LOG_ERR, "pwm: period value outside platform range");
         return MRAA_ERROR_INVALID_PARAMETER;
     }
@@ -373,11 +386,6 @@ mraa_pwm_enable(mraa_pwm_context dev, int enable)
         return dev->advance_func->pwm_enable_replace(dev, enable);
     }
     int status;
-    if (enable != 0) {
-        status = 1;
-    } else {
-        status = enable;
-    }
     char bu[MAX_SIZE];
     snprintf(bu, MAX_SIZE, "/sys/class/pwm/pwmchip%d/pwm%d/enable", dev->chipid, dev->pin);
 
@@ -498,19 +506,25 @@ mraa_pwm_config_percent(mraa_pwm_context dev, int ms, float percentage)
 }
 
 int
-mraa_pwm_get_max_period()
+mraa_pwm_get_max_period(mraa_pwm_context dev)
 {
     if (plat == NULL) {
         return -1;
     }
+    if (mraa_is_sub_platform_id(dev->chipid)) {
+        return plat->sub_platform->pwm_max_period;
+    }
     return plat->pwm_max_period;
 }
 
 int
-mraa_pwm_get_min_period()
+mraa_pwm_get_min_period(mraa_pwm_context dev)
 {
     if (plat == NULL) {
         return -1;
     }
+    if (mraa_is_sub_platform_id(dev->chipid)) {
+        return plat->sub_platform->pwm_min_period;
+    }
     return plat->pwm_min_period;
 }