drivers: gpio: sx1509b: remove ability to configure by port

It seems highly unlikely that anybody would want to configure all pins
to the same configuration.  Remove this feature to simplify the code
prior to rework.

Retain the ability to read and write all pins simultaneously as that has
use cases.

Signed-off-by: Peter A. Bigot <[email protected]>

Author: pabigot

drivers/gpio/gpio_sx1509b.c

@@ -89,12 +89,12 @@ static inline int i2c_reg_write_word_be(struct device *dev, u16_t dev_addr,
 }
 
 /**
- * @brief Configure pin or port
+ * @brief Configure pin (port not supported)
  *
  * @param dev Device struct of the SX1509B
- * @param access_op Access operation (pin or port)
+ * @param access_op Access operation (pin only, port not supported)
  * @param pin The pin number
- * @param flags Flags of pin or port
+ * @param flags Flags of pin
  *
  * @return 0 if successful, failed otherwise
  */
@@ -104,84 +104,48 @@ static int gpio_sx1509b_config(struct device *dev, int access_op, u32_t pin,
 	const struct gpio_sx1509b_config *cfg = dev->config->config_info;
 	struct gpio_sx1509b_drv_data *drv_data = dev->driver_data;
 	struct gpio_sx1509b_pin_state *pins = &drv_data->pin_state;
-	int ret = 0;
+	int ret = -ENOTSUP;
 
 	if (flags & GPIO_INT) {
-		return -ENOTSUP;
+		goto out;
+	}
+
+	if (access_op != GPIO_ACCESS_BY_PIN) {
+		goto out;
 	}
 
 	k_sem_take(&drv_data->lock, K_FOREVER);
 
-	switch (access_op) {
-	case GPIO_ACCESS_BY_PIN:
-		if ((flags & GPIO_DIR_MASK) == GPIO_DIR_IN) {
-			pins->dir |= BIT(pin);
-			pins->input_disable &= ~BIT(pin);
-		} else {
-			pins->dir &= ~BIT(pin);
-			pins->input_disable |= BIT(pin);
-		}
-		if ((flags & GPIO_PUD_MASK) == GPIO_PUD_PULL_UP) {
-			pins->pull_up |= BIT(pin);
-		} else {
-			pins->pull_up &= ~BIT(pin);
-		}
-		if ((flags & GPIO_PUD_MASK) == GPIO_PUD_PULL_DOWN) {
-			pins->pull_down |= BIT(pin);
-		} else {
-			pins->pull_down &= ~BIT(pin);
-		}
-		if ((flags & GPIO_PUD_MASK) == GPIO_PUD_NORMAL) {
-			pins->pull_up &= ~BIT(pin);
-			pins->pull_down &= ~BIT(pin);
-		}
-		if (flags & GPIO_DS_DISCONNECT_HIGH) {
-			pins->open_drain |= BIT(pin);
-		} else {
-			pins->open_drain &= ~BIT(pin);
-		}
-		if (flags & GPIO_POL_INV) {
-			pins->polarity |= BIT(pin);
-		} else {
-			pins->polarity &= ~BIT(pin);
-		}
-		break;
-	case GPIO_ACCESS_BY_PORT:
-		if ((flags & GPIO_DIR_MASK) == GPIO_DIR_IN) {
-			pins->dir = 0xffff;
-			pins->input_disable = 0x0000;
-		} else {
-			pins->dir = 0x0000;
-			pins->input_disable = 0xffff;
-		}
-		if ((flags & GPIO_PUD_MASK) == GPIO_PUD_PULL_UP) {
-			pins->pull_up = 0xffff;
-		} else {
-			pins->pull_up = 0x0000;
-		}
-		if ((flags & GPIO_PUD_MASK) == GPIO_PUD_PULL_DOWN) {
-			pins->pull_down = 0xffff;
-		} else {
-			pins->pull_down = 0x0000;
-		}
-		if ((flags & GPIO_PUD_MASK) == GPIO_PUD_NORMAL) {
-			pins->pull_up = 0x0000;
-			pins->pull_down = 0x0000;
-		}
-		if (flags & GPIO_DS_DISCONNECT_HIGH) {
-			pins->open_drain = 0xffff;
-		} else {
-			pins->open_drain = 0x0000;
-		}
-		if (flags & GPIO_POL_INV) {
-			pins->polarity = 0xffff;
-		} else {
-			pins->polarity = 0x0000;
-		}
-		break;
-	default:
-		ret = -ENOTSUP;
-		goto out;
+	if ((flags & GPIO_DIR_MASK) == GPIO_DIR_IN) {
+		pins->dir |= BIT(pin);
+		pins->input_disable &= ~BIT(pin);
+	} else {
+		pins->dir &= ~BIT(pin);
+		pins->input_disable |= BIT(pin);
+	}
+	if ((flags & GPIO_PUD_MASK) == GPIO_PUD_PULL_UP) {
+		pins->pull_up |= BIT(pin);
+	} else {
+		pins->pull_up &= ~BIT(pin);
+	}
+	if ((flags & GPIO_PUD_MASK) == GPIO_PUD_PULL_DOWN) {
+		pins->pull_down |= BIT(pin);
+	} else {
+		pins->pull_down &= ~BIT(pin);
+	}
+	if ((flags & GPIO_PUD_MASK) == GPIO_PUD_NORMAL) {
+		pins->pull_up &= ~BIT(pin);
+		pins->pull_down &= ~BIT(pin);
+	}
+	if (flags & GPIO_DS_DISCONNECT_HIGH) {
+		pins->open_drain |= BIT(pin);
+	} else {
+		pins->open_drain &= ~BIT(pin);
+	}
+	if (flags & GPIO_POL_INV) {
+		pins->polarity |= BIT(pin);
+	} else {
+		pins->polarity &= ~BIT(pin);
 	}
 
 	ret = i2c_reg_write_word_be(drv_data->i2c_master, cfg->i2c_slave_addr,