[DM/FEATURE] Support IIO (Industrial I/O)

components/drivers/iio/SConscript

@@ -0,0 +1,15 @@
+from building import *
+
+group = []
+
+if not GetDepend(['RT_USING_DM']):
+    Return('group')
+
+cwd = GetCurrentDir()
+CPPPATH = [cwd + '/../include']
+
+src = ['iio.c',]
+
+group = DefineGroup('DeviceDrivers', src, depend = [''], CPPPATH = CPPPATH)
+
+Return('group')

components/drivers/iio/iio.c

@@ -0,0 +1,71 @@
+/*
+ * Copyright (c) 2006-2022, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2022-3-08      GuEe-GUI     the first version
+ */
+
+#include <rtthread.h>
+#include <rtdevice.h>
+
+static void *ofw_iio_channel_get_by_index(struct rt_ofw_node *np, int index, int *out_channel)
+{
+    void *iio = RT_NULL;
+#ifdef RT_USING_OFW
+    struct rt_ofw_node *iio_np;
+    struct rt_ofw_cell_args iio_args;
+
+    if (!rt_ofw_parse_phandle_cells(np, "io-channels", "#io-channel-cells", index, &iio_args))
+    {
+        iio_np = iio_args.data;
+
+        if (!rt_ofw_data(iio_np))
+        {
+            rt_platform_ofw_request(iio_np);
+        }
+
+        iio = rt_ofw_data(iio_np);
+        rt_ofw_node_put(iio_np);
+
+        if (out_channel)
+        {
+            *out_channel = iio_args.args[0];
+        }
+    }
+#endif /* RT_USING_OFW */
+    return iio;
+}
+
+void *rt_iio_channel_get_by_index(struct rt_device *dev, int index, int *out_channel)
+{
+    void *iio = RT_NULL;
+
+    if (!dev || index < 0)
+    {
+        return RT_NULL;
+    }
+
+    if (dev->ofw_node)
+    {
+        iio = ofw_iio_channel_get_by_index(dev->ofw_node, index, out_channel);
+    }
+
+    return iio;
+}
+
+void *rt_iio_channel_get_by_name(struct rt_device *dev, const char *name, int *out_channel)
+{
+    int index;
+
+    if (!dev || !name)
+    {
+        return RT_NULL;
+    }
+
+    index = rt_dm_dev_prop_index_of_string(dev, "io-channel-names", name);
+
+    return rt_iio_channel_get_by_index(dev, index, out_channel);
+}

components/drivers/include/drivers/iio.h

@@ -0,0 +1,17 @@
+/*
+ * Copyright (c) 2006-2022, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2022-3-08      GuEe-GUI     the first version
+ */
+
+#ifndef __IIO_H__
+#define __IIO_H__
+
+void *rt_iio_channel_get_by_index(struct rt_device *dev, int index, int *out_channel);
+void *rt_iio_channel_get_by_name(struct rt_device *dev, const char *name, int *out_channel);
+
+#endif /* __IIO_H__ */

components/drivers/include/rtdevice.h

@@ -49,6 +49,8 @@ extern "C" {
 #include "drivers/blk.h"
 #endif
 
+#include "drivers/iio.h"
+
 #ifdef RT_USING_OFW
 #include "drivers/ofw.h"
 #include "drivers/ofw_fdt.h"