1 files changed, 145 insertions, 0 deletions
diff --git a/cpukit/libmisc/shell/main_i2cget.c b/cpukit/libmisc/shell/main_i2cget.c
new file mode 100644
index 0000000000..ffa551308b
--- /dev/null
+++ b/cpukit/libmisc/shell/main_i2cget.c
@@ -0,0 +1,145 @@
+/*
+ * 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 the i2cget has a continuous read mode that isn't available on
+ * Linux but does something similar to i2cdump.
+ */
+
+#include <dev/i2c/i2c.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include <rtems/shell.h>
+
+static const char rtems_i2cget_shell_usage [] =
+  "i2cget <I2C_BUS> <CHIP-ADDRESS> <DATA-ADDRESS> [<NR-BYTES>]\n"
+  "\tGet one or more bytes from an EEPROM like i2c device.\n"
+  "\tNote that multiple bytes will be read in continuous mode.\n";
+
+static int read_bytes(
+  int fd,
+  uint16_t i2c_address,
+  uint8_t data_address,
+  uint16_t nr_bytes
+)
+{
+  int rv;
+  uint8_t value[nr_bytes];
+  i2c_msg msgs[] = {{
+    .addr = i2c_address,
+    .flags = 0,
+    .buf = &data_address,
+    .len = 1,
+  }, {
+    .addr = i2c_address,
+    .flags = I2C_M_RD,
+    .buf = value,
+    .len = nr_bytes,
+  }};
+  struct i2c_rdwr_ioctl_data payload = {
+    .msgs = msgs,
+    .nmsgs = sizeof(msgs)/sizeof(msgs[0]),
+  };
+  uint16_t i;
+
+  rv = ioctl(fd, I2C_RDWR, &payload);
+  if (rv < 0) {
+    perror("ioctl failed");
+  } else {
+    for (i = 0; i < nr_bytes; ++i) {
+      printf("0x%02x ", value[i]);
+    }
+    printf("\n");
+  }
+
+  return rv;
+}
+
+static int rtems_i2cget_shell_main(int argc, char *argv[])
+{
+  int fd;
+  int rv;
+  const char *bus;
+  uint16_t chip_address;
+  uint8_t data_address;
+  uint16_t nr_bytes;
+
+  if (argc < 4 || argc > 5) {
+    printf(rtems_i2cget_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;
+  }
+
+  errno = 0;
+  data_address = (uint8_t) strtoul(argv[3], NULL, 0);
+  if (errno != 0) {
+    perror("Couldn't read data address");
+    return 1;
+  }
+
+  nr_bytes = 1;
+  if (argc == 5) {
+    errno = 0;
+    nr_bytes = (uint16_t) strtoul(argv[4], NULL, 0);
+    if (errno != 0) {
+      perror("Couldn't read number of bytes");
+      return 1;
+    }
+  }
+
+  bus = argv[1];
+  fd = open(bus, O_RDWR);
+  if (fd < 0) {
+    perror("Couldn't open bus");
+    return 1;
+  }
+
+  rv = read_bytes(fd, chip_address, data_address, nr_bytes);
+
+  close(fd);
+
+  return rv;
+}
+
+rtems_shell_cmd_t rtems_shell_I2CGET_Command = {
+  .name = "i2cget",
+  .usage = rtems_i2cget_shell_usage,
+  .topic = "misc",
+  .command = rtems_i2cget_shell_main,
+};