1 files changed, 124 insertions, 0 deletions
diff --git a/cpukit/libmisc/shell/main_i2cset.c b/cpukit/libmisc/shell/main_i2cset.c
new file mode 100644
index 0000000000..d9025b3b28
--- /dev/null
+++ b/cpukit/libmisc/shell/main_i2cset.c
@@ -0,0 +1,124 @@
+/*
+ * 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.
+ *
+ * Additionally it is possible to write multiple values as a continuous write.
+ */
+
+#include <dev/i2c/i2c.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include <rtems/shell.h>
+
+static const char rtems_i2cset_shell_usage [] =
+  "i2cset <I2C_BUS> <CHIP-ADDRESS> <DATA-ADDRESS> <VALUE> [<VALUE> [...]]\n"
+  "\tset one byte of an EEPROM like i2c device\n";
+
+static int
+rtems_i2cset_shell_main(int argc, char *argv[])
+{
+  int fd;
+  int rv;
+  const char *bus;
+  uint16_t chip_address;
+  /* Necessary: data-address and values. This will be a bit more. */
+  uint8_t writebuff[argc];
+  size_t len;
+  size_t i;
+  i2c_msg msgs[] = {{
+    .flags = 0,
+    .buf = writebuff,
+    .len = 0,
+  }};
+  struct i2c_rdwr_ioctl_data payload = {
+    .msgs = msgs,
+    .nmsgs = sizeof(msgs)/sizeof(msgs[0]),
+  };
+
+  if (argc < 5) {
+    printf(rtems_i2cset_shell_usage);
+    return 1;
+  }
+
+  errno = 0;
+  chip_address = (uint16_t) strtoul(argv[2], NULL, 0);
+  if (errno != 0) {
+    perror("Couldn't read CHIP_ADDRESS");
+    return 1;
+  }
+  msgs[0].addr = chip_address;
+
+  errno = 0;
+  writebuff[0] = (uint8_t) strtoul(argv[3], NULL, 0);
+  if (errno != 0) {
+    perror("Couldn't read DATA_ADDRESS");
+    return 1;
+  }
+
+  /* Read values starting from the fifth argument (index 4) */
+  i = 4;
+  len = 0;
+  while (i < argc) {
+    errno = 0;
+    writebuff[len + 1] = (uint8_t) strtoul(argv[i], NULL, 0);
+    if (errno != 0) {
+      perror("Couldn't read VALUE");
+      return 1;
+    }
+    ++i;
+    ++len;
+  }
+  msgs[0].len = len + 1; /* Don't forget address */
+
+  bus = argv[1];
+  fd = open(bus, O_RDWR);
+  if (fd < 0) {
+    perror("Couldn't open bus");
+    return 1;
+  }
+
+  rv = ioctl(fd, I2C_RDWR, &payload);
+  if (rv < 0) {
+    perror("ioctl failed");
+  }
+  close(fd);
+
+  return rv;
+}
+
+rtems_shell_cmd_t rtems_shell_I2CSET_Command = {
+  .name = "i2cset",
+  .usage = rtems_i2cset_shell_usage,
+  .topic = "misc",
+  .command = rtems_i2cset_shell_main,
+};