1 files changed, 107 insertions, 0 deletions
diff --git a/cpukit/libmisc/shell/main_i2cdetect.c b/cpukit/libmisc/shell/main_i2cdetect.c
new file mode 100644
index 0000000000..e953b4eaef
--- /dev/null
+++ b/cpukit/libmisc/shell/main_i2cdetect.c
@@ -0,0 +1,107 @@
+/*
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright (C) 2020 embedded brains GmbH.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/*
+ * The command implemented here has a similar interface like the one from Linux
+ * i2c tools. Think of it as a heavily simplified version of them. Instead of
+ * the bus number they expect a bus path.
+ */
+
+#include <dev/i2c/i2c.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <rtems/shell.h>
+
+static const char rtems_i2cdetect_shell_usage [] =
+  "i2cdetect <I2C_BUS>\n"
+  "\ttry to detect i2c devices on the given bus\n";
+
+static int rtems_i2cdetect_shell_main(int argc, char *argv[])
+{
+  int fd;
+  int rv;
+  const char *bus;
+  const uint16_t first = 1;
+  const uint16_t last = 0x7f;
+  uint16_t current;
+
+  if (argc != 2 || strcmp(argv[1], "-h") == 0) {
+    printf(rtems_i2cdetect_shell_usage);
+    return 1;
+  }
+
+  bus = argv[1];
+  fd = open(bus, O_RDWR);
+  if (fd < 0) {
+    perror("Couldn't open bus");
+    return 1;
+  }
+
+  printf("    x0 x1 x2 x3 x4 x5 x6 x7 x8 x9 xA xB xC xD xE xF\n"
+         "0x    ");
+  for (current = first; current <= last; ++current) {
+    i2c_msg msg = {
+      .addr = current,
+      .flags = 0,
+      .len = 0,
+      .buf = NULL,
+    };
+
+    struct i2c_rdwr_ioctl_data payload = {
+      .msgs = &msg,
+      .nmsgs = 1,
+    };
+
+    if ((current & 0x0F) == 0) {
+      printf("\n%1xx ", current >> 4);
+    }
+
+    rv = ioctl(fd, I2C_RDWR, &payload);
+    if (rv < 0) {
+      if (errno != EIO) {
+        perror("ioctl failed");
+      }
+      printf(" --");
+    } else {
+      printf(" %02x", current);
+    }
+  }
+  printf("\n");
+  close(fd);
+
+  return 0;
+}
+
+rtems_shell_cmd_t rtems_shell_I2CDETECT_Command = {
+  .name = "i2cdetect",
+  .usage = rtems_i2cdetect_shell_usage,
+  .topic = "misc",
+  .command = rtems_i2cdetect_shell_main,
+};