dev/sc16is752: Add GPIO access via ioctl.

cpukit/dev/serial/sc16is752-regs.h

@@ -107,6 +107,8 @@ extern "C" {
 #define EFR_RTS_FLOW_CTRL_EN (1u << 6)
 #define EFR_CTS_FLOW_CTRL_EN (1u << 7)
 
+/* IOCONTROL: User accessible. Therefore see sc16is752.h for the defines. */
+
 #define SC16IS752_FIFO_DEPTH 64
 
 #ifdef __cplusplus

cpukit/dev/serial/sc16is752.c

@@ -282,6 +282,7 @@ static int sc16is752_ioctl(
 )
 {
   sc16is752_context *ctx = (sc16is752_context *)base;
+  uint8_t regval;
 
   switch (request) {
     case SC16IS752_SET_SLEEP_MODE:
@@ -290,6 +291,25 @@ static int sc16is752_ioctl(
     case SC16IS752_GET_SLEEP_MODE:
       *(int *)buffer = is_sleep_mode_enabled(ctx);
       break;
+    case SC16IS752_SET_IOCONTROL:
+      regval = (*(uint8_t *)buffer) & ~SC16IS752_IOCONTROL_SRESET;
+      write_reg(ctx, SC16IS752_IOCONTROL, &regval, 1);
+      break;
+    case SC16IS752_GET_IOCONTROL:
+      read_reg(ctx, SC16IS752_IOCONTROL, (uint8_t *)buffer, 1);
+      break;
+    case SC16IS752_SET_IODIR:
+      write_reg(ctx, SC16IS752_IODIR, (uint8_t *)buffer, 1);
+      break;
+    case SC16IS752_GET_IODIR:
+      read_reg(ctx, SC16IS752_IODIR, (uint8_t *)buffer, 1);
+      break;
+    case SC16IS752_SET_IOSTATE:
+      write_reg(ctx, SC16IS752_IOSTATE, (uint8_t *)buffer, 1);
+      break;
+    case SC16IS752_GET_IOSTATE:
+      read_reg(ctx, SC16IS752_IOSTATE, (uint8_t *)buffer, 1);
+      break;
     default:
       rtems_set_errno_and_return_minus_one(EINVAL);
   }

cpukit/include/dev/serial/sc16is752.h

@@ -250,11 +250,56 @@ rtems_status_code sc16is752_spi_create(
  */
 #define SC16IS752_SET_SLEEP_MODE _IOW('d', 0, int)
 
+/**
+ * @brief Set the I/O Control bits except for the SRESET.
+ *
+ * Note that it will not be possible to set the SRESET. Otherwise the driver
+ * might would have an undefined state.
+ */
+#define SC16IS752_SET_IOCONTROL _IOW('d', 1, uint8_t)
+
+/**
+ * @brief Set the I/O pins direction register.
+ */
+#define SC16IS752_SET_IODIR _IOW('d', 2, uint8_t)
+
+/**
+ * @brief Set the I/O pins state register.
+ */
+#define SC16IS752_SET_IOSTATE _IOW('d', 3, uint8_t)
+
 /**
  * @brief Returns non-zero in case the sleep mode is enabled, otherwise zero.
  */
 #define SC16IS752_GET_SLEEP_MODE _IOR('d', 0, int)
 
+/**
+ * @brief Read the I/O Control register.
+ */
+#define SC16IS752_GET_IOCONTROL _IOR('d', 1, uint8_t)
+
+/**
+ * @brief Read the I/O pins direction register.
+ */
+#define SC16IS752_GET_IODIR _IOR('d', 2, uint8_t)
+
+/**
+ * @brief Read the I/O pins state register.
+ */
+#define SC16IS752_GET_IOSTATE _IOR('d', 3, uint8_t)
+
+/**
+ * @brief Bits for the IOCONTROL register.
+ * @{
+ */
+#define SC16IS752_IOCONTROL_SRESET (1u << 3)
+#define SC16IS752_IOCONTROL_GPIO_3_0_OR_MODEM (1u << 2)
+#define SC16IS752_IOCONTROL_GPIO_7_4_OR_MODEM (1u << 1)
+#define SC16IS752_IOCONTROL_IOLATCH (1u << 0)
+/**
+ * @}
+ */
+
 #ifdef __cplusplus
 }
 #endif /* __cplusplus */