1 files changed, 233 insertions, 0 deletions

diff --git a/drivers/usb/gadget/mass_storage.c b/drivers/usb/gadget/mass_storage.c
new file mode 100644
index 00000000000..27339f04bc1
--- /dev/null
+++ b/drivers/usb/gadget/mass_storage.c
@@ -0,0 +1,233 @@
+/*
+ * mass_storage.c -- File-backed USB Storage Gadget, for USB development
+ *
+ * Copyright (C) 2003-2008 Alan Stern
+ *
+ * Copyright (C) 2009 Samsung Electronics
+ *                    Author: Michal Nazarewicz <m.nazarewicz@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
+ */
+
+
+/*
+ * The Mass Storage Gadget acts as a USB Mass Storage device,
+ * appearing to the host as a disk drive or as a CD-ROM drive.  In
+ * addition to providing an example of a genuinely useful gadget
+ * driver for a USB device, it also illustrates a technique of
+ * double-buffering for increased throughput.  Last but not least, it
+ * gives an easy way to probe the behavior of the Mass Storage drivers
+ * in a USB host.
+ *
+ * Since this file serves only administrative purposes and all the
+ * business logic is implemented in f_mass_storage.* file.  Read
+ * comments in this file for more detailed description.
+ */
+
+
+#include <linux/kernel.h>
+#include <linux/utsname.h>
+#include <linux/usb/ch9.h>
+
+
+/*-------------------------------------------------------------------------*/
+
+#define DRIVER_DESC             "Mass Storage Gadget"
+#define DRIVER_VERSION          "2009/07/21"
+
+/*-------------------------------------------------------------------------*/
+
+/*
+ * kbuild is not very cooperative with respect to linking separately
+ * compiled library objects into one module.  So for now we won't use
+ * separate compilation ... ensuring init/exit sections work to shrink
+ * the runtime footprint, and giving us at least some parts of what
+ * a "gcc --combine ... part1.c part2.c part3.c ... " build would.
+ */
+
+#include "composite.c"
+#include "usbstring.c"
+#include "config.c"
+#include "epautoconf.c"
+#include "f_mass_storage.c"
+
+/*-------------------------------------------------------------------------*/
+
+static struct usb_device_descriptor msg_device_desc = {
+        .bLength =              sizeof msg_device_desc,
+        .bDescriptorType =      USB_DT_DEVICE,
+
+        .bcdUSB =               cpu_to_le16(0x0200),
+        .bDeviceClass =         USB_CLASS_PER_INTERFACE,
+
+        /* Vendor and product id can be overridden by module parameters.  */
+        .idVendor =             cpu_to_le16(FSG_VENDOR_ID),
+        .idProduct =            cpu_to_le16(FSG_PRODUCT_ID),
+        /* .bcdDevice = f(hardware) */
+        /* .iManufacturer = DYNAMIC */
+        /* .iProduct = DYNAMIC */
+        /* NO SERIAL NUMBER */
+        .bNumConfigurations =   1,
+};
+
+static struct usb_otg_descriptor otg_descriptor = {
+        .bLength =              sizeof otg_descriptor,
+        .bDescriptorType =      USB_DT_OTG,
+
+        /* REVISIT SRP-only hardware is possible, although
+         * it would not be called "OTG" ...
+         */
+        .bmAttributes =         USB_OTG_SRP | USB_OTG_HNP,
+};
+
+static const struct usb_descriptor_header *otg_desc[] = {
+        (struct usb_descriptor_header *) &otg_descriptor,
+        NULL,
+};
+
+
+/* string IDs are assigned dynamically */
+
+#define STRING_MANUFACTURER_IDX         0
+#define STRING_PRODUCT_IDX              1
+#define STRING_CONFIGURATION_IDX        2
+
+static char manufacturer[50];
+
+static struct usb_string strings_dev[] = {
+        [STRING_MANUFACTURER_IDX].s = manufacturer,
+        [STRING_PRODUCT_IDX].s = DRIVER_DESC,
+        [STRING_CONFIGURATION_IDX].s = "Self Powered",
+        {  } /* end of list */
+};
+
+static struct usb_gadget_strings stringtab_dev = {
+        .language       = 0x0409,       /* en-us */
+        .strings        = strings_dev,
+};
+
+static struct usb_gadget_strings *dev_strings[] = {
+        &stringtab_dev,
+        NULL,
+};
+
+
+
+/****************************** Configurations ******************************/
+
+static int __init msg_do_config(struct usb_configuration *c)
+{
+        struct fsg_common *common;
+        int ret;
+
+        if (gadget_is_otg(c->cdev->gadget)) {
+                c->descriptors = otg_desc;
+                c->bmAttributes |= USB_CONFIG_ATT_WAKEUP;
+        }
+
+        common = fsg_common_init(0, c->cdev);
+        if (IS_ERR(common))
+                return PTR_ERR(common);
+
+        ret = fsg_add(c->cdev, c, common);
+        fsg_common_put(common);
+        return ret;
+}
+
+static struct usb_configuration msg_config_driver = {
+        .label                  = "Linux File-Backed Storage",
+        .bind                   = msg_do_config,
+        .bConfigurationValue    = 1,
+        /* .iConfiguration = DYNAMIC */
+        .bmAttributes           = USB_CONFIG_ATT_SELFPOWER,
+};
+
+
+
+/****************************** Gadget Bind ******************************/
+
+
+static int __init msg_bind(struct usb_composite_dev *cdev)
+{
+        struct usb_gadget *gadget = cdev->gadget;
+        int status;
+
+        /* Allocate string descriptor numbers ... note that string
+         * contents can be overridden by the composite_dev glue.
+         */
+
+        /* device descriptor strings: manufacturer, product */
+        snprintf(manufacturer, sizeof manufacturer, "%s %s with %s",
+                 init_utsname()->sysname, init_utsname()->release,
+                 gadget->name);
+        status = usb_string_id(cdev);
+        if (status < 0)
+                return status;
+        strings_dev[STRING_MANUFACTURER_IDX].id = status;
+        msg_device_desc.iManufacturer = status;
+
+        status = usb_string_id(cdev);
+        if (status < 0)
+                return status;
+        strings_dev[STRING_PRODUCT_IDX].id = status;
+        msg_device_desc.iProduct = status;
+
+        status = usb_string_id(cdev);
+        if (status < 0)
+                return status;
+        strings_dev[STRING_CONFIGURATION_IDX].id = status;
+        msg_config_driver.iConfiguration = status;
+
+        /* register our second configuration */
+        status = usb_add_config(cdev, &msg_config_driver);
+        if (status < 0)
+                return status;
+
+        dev_info(&gadget->dev, DRIVER_DESC ", version: " DRIVER_VERSION "\n");
+        return 0;
+}
+
+static int __exit msg_unbind(struct usb_composite_dev *cdev)
+{
+        return 0;
+}
+
+
+/****************************** Some noise ******************************/
+
+
+static struct usb_composite_driver msg_driver = {
+        .name           = "g_mass_storage",
+        .dev            = &msg_device_desc,
+        .strings        = dev_strings,
+        .bind           = msg_bind,
+        .unbind         = __exit_p(msg_unbind),
+};
+
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_AUTHOR("Michal Nazarewicz");
+MODULE_LICENSE("GPL");
+
+static int __init msg_init(void)
+{
+        return usb_composite_register(&msg_driver);
+}
+module_init(msg_init);
+
+static void __exit msg_cleanup(void)
+{
+        usb_composite_unregister(&msg_driver);
+}
+module_exit(msg_cleanup);