[U-Boot] [PATCH RESEND 5/9] EEPROM: Add an EEPROM uclass

[Maxime Ripard]

We might want to access data stored onto EEPROMs. Create a framework to
provide a consistent API.

Signed-off-by: Maxime Ripard <maxime.ripard at free-electrons.com>
---
 drivers/Kconfig                |  2 +-
 drivers/Makefile               |  1 +-
 drivers/eeprom/Kconfig         | 17 ++++++++++-
 drivers/eeprom/Makefile        |  2 +-
 drivers/eeprom/eeprom-uclass.c | 57 +++++++++++++++++++++++++++++++++++-
 include/dm/uclass-id.h         |  1 +-
 include/eeprom.h               | 21 +++++++++++++-
 7 files changed, 101 insertions(+), 0 deletions(-)
 create mode 100644 drivers/eeprom/Kconfig
 create mode 100644 drivers/eeprom/Makefile
 create mode 100644 drivers/eeprom/eeprom-uclass.c
 create mode 100644 include/eeprom.h

diff --git a/drivers/Kconfig b/drivers/Kconfig
index 74194b0d6f7f..e518752eae1a 100644
--- a/drivers/Kconfig
+++ b/drivers/Kconfig
@@ -20,6 +20,8 @@ source "drivers/dfu/Kconfig"
 
 source "drivers/dma/Kconfig"
 
+source "drivers/eeprom/Kconfig"
+
 source "drivers/fpga/Kconfig"
 
 source "drivers/gpio/Kconfig"
diff --git a/drivers/Makefile b/drivers/Makefile
index 543c43bb0d23..c8f285f66bb3 100644
--- a/drivers/Makefile
+++ b/drivers/Makefile
@@ -64,6 +64,7 @@ obj-y += block/
 obj-$(CONFIG_BOOTCOUNT_LIMIT) += bootcount/
 obj-$(CONFIG_CPU) += cpu/
 obj-y += crypto/
+obj-y += eeprom/
 obj-$(CONFIG_FPGA) += fpga/
 obj-y += hwmon/
 obj-y += misc/
diff --git a/drivers/eeprom/Kconfig b/drivers/eeprom/Kconfig
new file mode 100644
index 000000000000..8dc597a8d894
--- /dev/null
+++ b/drivers/eeprom/Kconfig
@@ -0,0 +1,17 @@
+#
+# EEPROM subsystem configuration
+#
+
+menu "EEPROM support"
+
+config EEPROM
+	bool "Enable EEPROM support"
+	depends on DM
+	help
+	  Support for the EEPROMs
+
+if EEPROM
+
+endif
+
+endmenu
diff --git a/drivers/eeprom/Makefile b/drivers/eeprom/Makefile
new file mode 100644
index 000000000000..147dba5ec4b8
--- /dev/null
+++ b/drivers/eeprom/Makefile
@@ -0,0 +1,2 @@
+obj-$(CONFIG_EEPROM) += eeprom-uclass.o
+
diff --git a/drivers/eeprom/eeprom-uclass.c b/drivers/eeprom/eeprom-uclass.c
new file mode 100644
index 000000000000..020b0087d22c
--- /dev/null
+++ b/drivers/eeprom/eeprom-uclass.c
@@ -0,0 +1,57 @@
+/*
+ * Copyright (c) 2015 Free Electrons
+ * Copyright (c) 2015 NextThing Co.
+ *
+ * Maxime Ripard <maxime.ripard at free-electrons.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <eeprom.h>
+
+#include <dm/device-internal.h>
+
+int eeprom_read_buf(struct udevice *dev, unsigned offset,
+		    u8 *buf, unsigned count)
+{
+	const struct eeprom_ops *ops = device_get_ops(dev);
+
+	if (!ops->read_buf)
+		return -ENOSYS;
+
+	return ops->read_buf(dev, offset, buf, count);
+}
+
+
+UCLASS_DRIVER(eeprom) = {
+	.name		= "eeprom",
+	.id		= UCLASS_EEPROM,
+};
+
+int eeprom_dm_init(void)
+{
+	struct udevice *bus;
+	struct uclass *uc;
+	int ret;
+
+	ret = uclass_get(UCLASS_EEPROM, &uc);
+	if (ret)
+		return ret;
+
+	uclass_foreach_dev(bus, uc) {
+		ret = device_probe(bus);
+		if (ret == -ENODEV) {	/* No such device. */
+			printf("EEPROM not available.\n");
+			continue;
+		}
+
+		if (ret) {		/* Other error. */
+			printf("EEPROM probe failed, error %d\n", ret);
+			continue;
+		}
+	}
+
+	return 0;
+}
diff --git a/include/dm/uclass-id.h b/include/dm/uclass-id.h
index b88adcbe802f..909a32404259 100644
--- a/include/dm/uclass-id.h
+++ b/include/dm/uclass-id.h
@@ -83,6 +83,7 @@ enum uclass_id {
 	UCLASS_VIDEO_BRIDGE,	/* Video bridge, e.g. DisplayPort to LVDS */
 	UCLASS_VIDEO_CONSOLE,	/* Text console driver for video device */
 	UCLASS_W1,		/* Dallas 1-Wire bus */
+	UCLASS_EEPROM,		/* EEPROM */
 
 	UCLASS_COUNT,
 	UCLASS_INVALID = -1,
diff --git a/include/eeprom.h b/include/eeprom.h
new file mode 100644
index 000000000000..648c8606c35a
--- /dev/null
+++ b/include/eeprom.h
@@ -0,0 +1,21 @@
+/*
+ * Copyright (c) 2015 Free Electrons
+ * Copyright (c) 2015 NextThing Co
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#ifndef __EEPROM_H
+#define __EEPROM_H
+
+#include <dm.h>
+
+struct eeprom_ops {
+	int	(*read_buf)(struct udevice *dev, unsigned offset,
+			    u8 *buf, unsigned count);
+};
+
+int eeprom_read_buf(struct udevice *dev, unsigned offset,
+		    u8 *buf, unsigned count);
+
+#endif
-- 
git-series 0.8.11