Add NXP PCA9548A 8-channel switch I2C driver

cpukit/dev/i2c/switch-nxp-pca9548a.c

@@ -0,0 +1,99 @@
+/**
+ * @file
+ *
+ * @brief Switch NXP PCA9548A Driver Implementation
+ *
+ * @ingroup I2CSWITCHNXPPCA9548A
+ */
+
+/*
+ * Copyright (c) 2014 embedded brains GmbH.  All rights reserved.
+ *
+ *  embedded brains GmbH
+ *  Dornierstr. 4
+ *  82178 Puchheim
+ *  Germany
+ *  <rtems@embedded-brains.de>
+ *
+ * The license and distribution terms for this file may be
+ * found in the file LICENSE in this distribution or at
+ * http://www.rtems.org/license/LICENSE.
+ */
+
+#if HAVE_CONFIG_H
+  #include "config.h"
+#endif
+
+#include <dev/i2c/switch-nxp-pca9548a.h>
+
+static int switch_nxp_pca9548a_do_get_control(
+  i2c_dev *dev,
+  uint8_t *val
+)
+{
+  i2c_msg msg = {
+    .addr = dev->address,
+    .flags = I2C_M_RD,
+    .len = (uint16_t) sizeof(*val),
+    .buf = val
+  };
+
+  return i2c_bus_transfer(dev->bus, &msg, 1);
+}
+
+static int switch_nxp_pca9548a_do_set_control(
+  i2c_dev *dev,
+  uint8_t val
+)
+{
+  i2c_msg msg = {
+    .addr = dev->address,
+    .flags = 0,
+    .len = (uint16_t) sizeof(val),
+    .buf = &val
+  };
+
+  return i2c_bus_transfer(dev->bus, &msg, 1);
+}
+
+static int switch_nxp_pca9548a_ioctl(
+  i2c_dev *dev,
+  ioctl_command_t command,
+  void *arg
+)
+{
+  uint8_t v8 = (uint8_t)(uintptr_t) arg;
+  int err;
+
+  switch (command) {
+    case SWITCH_NXP_PCA9548A_GET_CONTROL:
+      err = switch_nxp_pca9548a_do_get_control(dev, arg);
+      break;
+    case SWITCH_NXP_PCA9548A_SET_CONTROL:
+      err = switch_nxp_pca9548a_do_set_control(dev, v8);
+      break;
+    default:
+      err = -ENOTTY;
+      break;
+  }
+
+  return err;
+}
+
+int i2c_dev_register_switch_nxp_pca9548a(
+  const char *bus_path,
+  const char *dev_path,
+  uint16_t address
+)
+{
+  i2c_dev *dev;
+
+  dev = i2c_dev_alloc_and_init(sizeof(*dev), bus_path, address);
+  if (dev == NULL) {
+    return -1;
+  }
+
+  dev->ioctl = switch_nxp_pca9548a_ioctl;
+
+  return i2c_dev_register(dev, dev_path);
+}