cros_ec: Move EC interface into common library

Add a common library for obtaining access to the Chrome OS EC. This is
used by boards which need to talk to the EC.

Reviewed-by: Vadim Bendebury <vbendeb@google.com>
Tested-by: Vadim Bendebury <vbendeb@google.com>
Signed-off-by: Vadim Bendebury <vbendeb@chromium.org>
Signed-off-by: Simon Glass <sjg@chromium.org>

board/samsung/common/board.c

@@ -26,13 +26,6 @@
 
 DECLARE_GLOBAL_DATA_PTR;
 
-struct local_info {
-	struct cros_ec_dev *cros_ec_dev;	/* Pointer to cros_ec device */
-	int cros_ec_err;			/* Error for cros_ec, 0 if ok */
-};
-
-static struct local_info local;
-
 #if defined CONFIG_EXYNOS_TMU
 /* Boot Time Thermal Analysis for SoC temperature threshold breach */
 static void boot_temp_check(void)
@@ -144,22 +137,6 @@ int board_early_init_f(void)
 }
 #endif
 
-struct cros_ec_dev *board_get_cros_ec_dev(void)
-{
-	return local.cros_ec_dev;
-}
-
-#ifdef CONFIG_CROS_EC
-static int board_init_cros_ec_devices(const void *blob)
-{
-	local.cros_ec_err = cros_ec_init(blob, &local.cros_ec_dev);
-	if (local.cros_ec_err)
-		return -1;  /* Will report in board_late_init() */
-
-	return 0;
-}
-#endif
-
 #if defined(CONFIG_POWER)
 #ifdef CONFIG_POWER_MAX77686
 static int pmic_reg_update(struct pmic *p, int reg, uint regval)
@@ -384,12 +361,12 @@ int board_late_init(void)
 {
 	stdio_print_current_devices();
 
-	if (local.cros_ec_err) {
+	if (cros_ec_get_error()) {
 		/* Force console on */
 		gd->flags &= ~GD_FLG_SILENT;
 
 		printf("cros-ec communications failure %d\n",
-		       local.cros_ec_err);
+		       cros_ec_get_error());
 		puts("\nPlease reset with Power+Refresh\n\n");
 		panic("Cannot init cros-ec device");
 		return -1;
@@ -401,7 +378,7 @@ int board_late_init(void)
 int arch_early_init_r(void)
 {
 #ifdef CONFIG_CROS_EC
-	if (board_init_cros_ec_devices(gd->fdt_blob)) {
+	if (cros_ec_board_init()) {
 		printf("%s: Failed to init EC\n", __func__);
 		return 0;
 	}

board/samsung/smdk5250/exynos5-dt.c

@@ -5,7 +5,6 @@
  */
 
 #include <common.h>
-#include <cros_ec.h>
 #include <fdtdec.h>
 #include <asm/io.h>
 #include <errno.h>

common/Makefile

@@ -230,6 +230,7 @@ obj-$(SPD) += ddr_spd.o
 obj-$(CONFIG_HWCONFIG) += hwconfig.o
 obj-$(CONFIG_BOUNCE_BUFFER) += bouncebuf.o
 obj-y += console.o
+obj-$(CONFIG_CROS_EC) += cros_ec.o
 obj-y += dlmalloc.o
 obj-y += image.o
 obj-$(CONFIG_OF_LIBFDT) += image-fdt.o

common/cros_ec.c

@@ -0,0 +1,44 @@
+/*
+ * Copyright (c) 2012 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.
+ *
+ * Alternatively, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL") version 2 as published by the Free
+ * Software Foundation.
+ */
+
+#include <common.h>
+#include <cros_ec.h>
+DECLARE_GLOBAL_DATA_PTR;
+
+struct local_info {
+	struct cros_ec_dev *cros_ec_dev;	/* Pointer to cros_ec device */
+	int cros_ec_err;			/* Error for cros_ec, 0 if ok */
+};
+
+static struct local_info local;
+
+struct cros_ec_dev *board_get_cros_ec_dev(void)
+{
+	return local.cros_ec_dev;
+}
+
+static int board_init_cros_ec_devices(const void *blob)
+{
+	local.cros_ec_err = cros_ec_init(blob, &local.cros_ec_dev);
+	if (local.cros_ec_err)
+		return -1;  /* Will report in board_late_init() */
+
+	return 0;
+}
+
+int cros_ec_board_init(void)
+{
+	return board_init_cros_ec_devices(gd->fdt_blob);
+}
+
+int cros_ec_get_error(void)
+{
+	return local.cros_ec_err;
+}

include/cros_ec.h

@@ -431,4 +431,22 @@ int cros_ec_set_ldo(struct cros_ec_dev *dev, uint8_t index, uint8_t state);
  * @return 0 if ok, -1 on error
  */
 int cros_ec_get_ldo(struct cros_ec_dev *dev, uint8_t index, uint8_t *state);
+
+/**
+ * Initialize the Chrome OS EC at board initialization time.
+ *
+ * @return 0 if ok, -ve on error
+ */
+int cros_ec_board_init(void);
+
+/**
+ * Get access to the error reported when cros_ec_board_init() was called
+ *
+ * This permits delayed reporting of the EC error if it failed during
+ * early init.
+ *
+ * @return error (0 if there was no error, -ve if there was an error)
+ */
+int cros_ec_get_error(void);
+
 #endif