ectool prefers /dev/cros_ec, then falls back to i2c, lpc

This is preparation for the common userspace EC interface. If/when that
appears, this will be ready.

BUG=chromium:239197
BRANCH=all
TEST=manual

Build, install, run it. Shouldn't be any change.

Change-Id: I9fa78515ec5443ba659f10a66bbaadcb7f4802b0
Signed-off-by: Bill Richardson <wfrichar@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/56131

1 files changed, 82 insertions, 0 deletions

diff --git a/util/comm-dev.c b/util/comm-dev.c
new file mode 100644
index 0000000000..2802aeca24
--- /dev/null
+++ b/util/comm-dev.c
@@ -0,0 +1,82 @@
+/* Copyright (c) 2013 The Chromium OS Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include <errno.h>
+#include <fcntl.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <string.h>
+#include <sys/ioctl.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#include "cros_ec_dev.h"
+#include "comm-host.h"
+#include "ec_commands.h"
+
+static int fd = -1;
+
+static int ec_command_dev(int command, int version,
+			  const void *outdata, int outsize,
+			  void *indata, int insize)
+{
+	struct cros_ec_command s_cmd;
+
+	s_cmd.command = command;
+	s_cmd.version = version;
+	s_cmd.result = 0xff;
+	s_cmd.outsize = outsize;
+	s_cmd.outdata = (uint8_t *)outdata;
+	s_cmd.insize = insize;
+	s_cmd.indata = indata;
+
+	if (ioctl(fd, CROS_EC_DEV_IOCXCMD, &s_cmd))
+		return -1;
+
+	return s_cmd.insize;
+}
+
+static int ec_readmem_dev(int offset, int bytes, void *dest)
+{
+	struct cros_ec_readmem s_mem;
+
+	s_mem.offset = offset;
+	s_mem.bytes = bytes;
+	s_mem.buffer = dest;
+
+	return ioctl(fd, CROS_EC_DEV_IOCRDMEM, &s_mem);
+}
+
+int comm_init_dev(void)
+{
+	char version[80];
+	int r;
+	char *s;
+
+	fd = open("/dev/" CROS_EC_DEV_NAME, O_RDWR);
+	if (fd < 0)
+		return 1;
+
+	r = read(fd, version, sizeof(version)-1);
+	if (r <= 0) {
+		close(fd);
+		return 2;
+	}
+	version[r] = '\0';
+	s = strchr(version, '\n');
+	if (s)
+		*s = '\0';
+	if (strcmp(version, CROS_EC_DEV_VERSION)) {
+		close(fd);
+		return 3;
+	}
+
+	ec_command = ec_command_dev;
+	if (ec_readmem_dev(EC_MEMMAP_ID, 2, version) == 2)
+		ec_readmem = ec_readmem_dev;
+
+	return 0;
+}