[U-Boot] [PATCH v2 4/5] usb:gadget: USB Mass Storage Gadget support

[Lukasz Majewski]

This patch adds the USB Mass Storage Gadget to u-boot
New command called "ums" is implemented to provide access
to on-device embedded persistent memory.

USB Mass Storage is supposed to work on top of the USB
Gadget framework

Signed-off-by: Lukasz Majewski <l.majewski at samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park at samsung.com>
Cc: Minkyu Kang <mk7.kang at samsung.com>
Cc: Remy Bohmer <linux at bohmer.net>
---
 common/Makefile               |    1 +
 common/cmd_usb_mass_storage.c |   78 +++++++++++++++++++++++++++++++++++++++++
 drivers/usb/gadget/Makefile   |    1 +
 include/usb_mass_storage.h    |   56 +++++++++++++++++++++++++++++
 4 files changed, 136 insertions(+), 0 deletions(-)
 create mode 100644 common/cmd_usb_mass_storage.c
 create mode 100644 include/usb_mass_storage.h

diff --git a/common/Makefile b/common/Makefile
index 224b7cc..2fc1437 100644
--- a/common/Makefile
+++ b/common/Makefile
@@ -158,6 +158,7 @@ COBJS-y += cmd_usb.o
 COBJS-y += usb.o
 COBJS-$(CONFIG_USB_STORAGE) += usb_storage.o
 endif
+COBJS-$(CONFIG_CMD_USB_MASS_STORAGE) += cmd_usb_mass_storage.o
 COBJS-$(CONFIG_CMD_XIMG) += cmd_ximg.o
 COBJS-$(CONFIG_YAFFS2) += cmd_yaffs2.o
 
diff --git a/common/cmd_usb_mass_storage.c b/common/cmd_usb_mass_storage.c
new file mode 100644
index 0000000..03fde2f
--- /dev/null
+++ b/common/cmd_usb_mass_storage.c
@@ -0,0 +1,78 @@
+/*
+ * Copyright (C) 2011 Samsung Electrnoics
+ * Lukasz Majewski <l.majewski at samsung.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#include <errno.h>
+#include <common.h>
+#include <command.h>
+#include <usb_mass_storage.h>
+
+#undef UMS_DBG
+#define UMS_DBG(fmt, args...) printf(fmt, ##args)
+/* #define UMS_DBG(...) */
+
+int do_usb_mass_storage(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
+{
+	char *ep;
+	unsigned int dev_num = 0, offset = 0, part_size = 0;
+
+	struct ums_board_info *ums_info;
+
+	if (argc < 2) {
+		printf("usage: ums <dev> - e.g. ums 0\n");
+		return 0;
+	}
+
+	dev_num = (int)simple_strtoul(argv[1], &ep, 16);
+
+	if (dev_num) {
+		puts("\nSet eMMC device to 0! - e.g. ums 0\n");
+		goto fail;
+	}
+
+	ums_info = board_ums_init(dev_num, offset, part_size);
+
+	if (!ums_info) {
+		printf("MMC: %d -> NOT available\n", dev_num);
+		goto fail;
+	}
+
+	fsg_init(ums_info);
+	while (1) {
+		int irq_res;
+		/* Handle control-c and timeouts */
+		if (ctrlc()) {
+			printf("The remote end did not respond in time.\n");
+			goto fail;
+		}
+
+		irq_res = usb_gadget_handle_interrupts();
+
+		/* Check if USB cable has been detached */
+		if (fsg_main_thread(NULL) == EIO)
+			goto fail;
+	}
+fail:
+	return -1;
+}
+
+U_BOOT_CMD(ums, CONFIG_SYS_MAXARGS, 1, do_usb_mass_storage,
+	"Use the UMS [User Mass Storage]",
+	"ums - User Mass Storage Gadget"
+);
diff --git a/drivers/usb/gadget/Makefile b/drivers/usb/gadget/Makefile
index 6717e4f..1d27b42 100644
--- a/drivers/usb/gadget/Makefile
+++ b/drivers/usb/gadget/Makefile
@@ -28,6 +28,7 @@ LIB	:= $(obj)libusb_gadget.o
 # new USB gadget layer dependencies
 ifdef CONFIG_USB_GADGET
 COBJS-y += epautoconf.o config.o usbstring.o
+COBJS-$(CONFIG_USB_GADGET_MASS_STORAGE) += file_storage.o
 COBJS-$(CONFIG_USB_GADGET_S3C_UDC_OTG) += s3c_udc_otg.o
 else
 # Devices not related to the new gadget layer depend on CONFIG_USB_DEVICE
diff --git a/include/usb_mass_storage.h b/include/usb_mass_storage.h
new file mode 100644
index 0000000..3154f49
--- /dev/null
+++ b/include/usb_mass_storage.h
@@ -0,0 +1,56 @@
+/*
+ * Copyright (C) 2011 Samsung Electrnoics
+ * Lukasz Majewski <l.majewski at samsung.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * aloong with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#ifndef __USB_MASS_STORAGE_H__
+#define __USB_MASS_STORAGE_H__
+
+#define SECTOR_SIZE		0x200
+
+#include <mmc.h>
+
+struct ums_device {
+	struct mmc *mmc;
+	int dev_num;
+	int offset;
+	int part_size;
+};
+
+struct ums_board_info {
+	int (*read_sector)(struct ums_device *ums_dev,
+			   unsigned int n, void *buf);
+	int (*write_sector)(struct ums_device *ums_dev,
+			    unsigned int n, void *buf);
+	void (*get_capacity)(struct ums_device *ums_dev,
+			     long long int *capacity);
+	const char *name;
+	struct ums_device ums_dev;
+};
+
+extern int fsg_init(struct ums_board_info *);
+extern struct ums_board_info *board_ums_init(unsigned int,
+					     unsigned int, unsigned int);
+extern int usb_gadget_handle_interrupts(void);
+extern int fsg_main_thread(void *);
+
+/* USB Attach/Detach */
+extern int micro_usb_attached(void);
+extern int micro_usb_detach(void);
+
+#endif /* __USB_MASS_STORAGE_H__ */
-- 
1.7.2.3