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246 lines
6.6 KiB
246 lines
6.6 KiB
/*
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* mass_storage.c -- Mass Storage USB Gadget
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*
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* Copyright (C) 2003-2008 Alan Stern
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* Copyright (C) 2009 Samsung Electronics
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* Author: Michal Nazarewicz <m.nazarewicz@samsung.com>
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* All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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/*
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* The Mass Storage Gadget acts as a USB Mass Storage device,
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* appearing to the host as a disk drive or as a CD-ROM drive. In
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* addition to providing an example of a genuinely useful gadget
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* driver for a USB device, it also illustrates a technique of
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* double-buffering for increased throughput. Last but not least, it
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* gives an easy way to probe the behavior of the Mass Storage drivers
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* in a USB host.
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*
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* Since this file serves only administrative purposes and all the
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* business logic is implemented in f_mass_storage.* file. Read
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* comments in this file for more detailed description.
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*/
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#include <linux/kernel.h>
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#include <linux/utsname.h>
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#include <linux/usb/ch9.h>
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/*-------------------------------------------------------------------------*/
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#define DRIVER_DESC "Mass Storage Gadget"
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#define DRIVER_VERSION "2009/09/11"
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/*-------------------------------------------------------------------------*/
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/*
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* kbuild is not very cooperative with respect to linking separately
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* compiled library objects into one module. So for now we won't use
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* separate compilation ... ensuring init/exit sections work to shrink
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* the runtime footprint, and giving us at least some parts of what
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* a "gcc --combine ... part1.c part2.c part3.c ... " build would.
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*/
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#include "composite.c"
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#include "usbstring.c"
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#include "config.c"
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#include "epautoconf.c"
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#include "f_mass_storage.c"
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/*-------------------------------------------------------------------------*/
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static struct usb_device_descriptor msg_device_desc = {
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.bLength = sizeof msg_device_desc,
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.bDescriptorType = USB_DT_DEVICE,
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.bcdUSB = cpu_to_le16(0x0200),
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.bDeviceClass = USB_CLASS_PER_INTERFACE,
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/* Vendor and product id can be overridden by module parameters. */
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.idVendor = cpu_to_le16(FSG_VENDOR_ID),
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.idProduct = cpu_to_le16(FSG_PRODUCT_ID),
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/* .bcdDevice = f(hardware) */
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/* .iManufacturer = DYNAMIC */
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/* .iProduct = DYNAMIC */
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/* NO SERIAL NUMBER */
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.bNumConfigurations = 1,
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};
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static struct usb_otg_descriptor otg_descriptor = {
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.bLength = sizeof otg_descriptor,
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.bDescriptorType = USB_DT_OTG,
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/* REVISIT SRP-only hardware is possible, although
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* it would not be called "OTG" ...
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*/
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.bmAttributes = USB_OTG_SRP | USB_OTG_HNP,
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};
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static const struct usb_descriptor_header *otg_desc[] = {
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(struct usb_descriptor_header *) &otg_descriptor,
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NULL,
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};
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/* string IDs are assigned dynamically */
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#define STRING_MANUFACTURER_IDX 0
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#define STRING_PRODUCT_IDX 1
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#define STRING_CONFIGURATION_IDX 2
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static char manufacturer[50];
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static struct usb_string strings_dev[] = {
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[STRING_MANUFACTURER_IDX].s = manufacturer,
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[STRING_PRODUCT_IDX].s = DRIVER_DESC,
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[STRING_CONFIGURATION_IDX].s = "Self Powered",
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{ } /* end of list */
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};
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static struct usb_gadget_strings stringtab_dev = {
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.language = 0x0409, /* en-us */
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.strings = strings_dev,
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};
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static struct usb_gadget_strings *dev_strings[] = {
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&stringtab_dev,
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NULL,
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};
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/****************************** Configurations ******************************/
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static struct fsg_module_parameters mod_data = {
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.stall = 1
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};
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FSG_MODULE_PARAMETERS(/* no prefix */, mod_data);
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static unsigned long msg_registered = 0;
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static void msg_cleanup(void);
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static int msg_thread_exits(struct fsg_common *common)
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{
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msg_cleanup();
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return 0;
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}
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static int __init msg_do_config(struct usb_configuration *c)
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{
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struct fsg_common *common;
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struct fsg_config config;
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int ret;
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if (gadget_is_otg(c->cdev->gadget)) {
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c->descriptors = otg_desc;
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c->bmAttributes |= USB_CONFIG_ATT_WAKEUP;
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}
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fsg_config_from_params(&config, &mod_data);
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config.thread_exits = msg_thread_exits;
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common = fsg_common_init(0, c->cdev, &config);
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if (IS_ERR(common))
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return PTR_ERR(common);
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ret = fsg_add(c->cdev, c, common);
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fsg_common_put(common);
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return ret;
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}
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static struct usb_configuration msg_config_driver = {
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.label = "Linux File-Backed Storage",
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.bind = msg_do_config,
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.bConfigurationValue = 1,
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/* .iConfiguration = DYNAMIC */
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.bmAttributes = USB_CONFIG_ATT_SELFPOWER,
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};
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/****************************** Gadget Bind ******************************/
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static int __init msg_bind(struct usb_composite_dev *cdev)
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{
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struct usb_gadget *gadget = cdev->gadget;
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int status;
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/* Allocate string descriptor numbers ... note that string
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* contents can be overridden by the composite_dev glue.
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*/
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/* device descriptor strings: manufacturer, product */
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snprintf(manufacturer, sizeof manufacturer, "%s %s with %s",
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init_utsname()->sysname, init_utsname()->release,
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gadget->name);
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status = usb_string_id(cdev);
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if (status < 0)
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return status;
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strings_dev[STRING_MANUFACTURER_IDX].id = status;
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msg_device_desc.iManufacturer = status;
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status = usb_string_id(cdev);
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if (status < 0)
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return status;
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strings_dev[STRING_PRODUCT_IDX].id = status;
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msg_device_desc.iProduct = status;
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status = usb_string_id(cdev);
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if (status < 0)
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return status;
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strings_dev[STRING_CONFIGURATION_IDX].id = status;
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msg_config_driver.iConfiguration = status;
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/* register our second configuration */
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status = usb_add_config(cdev, &msg_config_driver);
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if (status < 0)
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return status;
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dev_info(&gadget->dev, DRIVER_DESC ", version: " DRIVER_VERSION "\n");
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set_bit(0, &msg_registered);
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return 0;
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}
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/****************************** Some noise ******************************/
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static struct usb_composite_driver msg_driver = {
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.name = "g_mass_storage",
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.dev = &msg_device_desc,
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.strings = dev_strings,
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.bind = msg_bind,
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};
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MODULE_DESCRIPTION(DRIVER_DESC);
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MODULE_AUTHOR("Michal Nazarewicz");
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MODULE_LICENSE("GPL");
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static int __init msg_init(void)
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{
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return usb_composite_register(&msg_driver);
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}
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module_init(msg_init);
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static void msg_cleanup(void)
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{
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if (test_and_clear_bit(0, &msg_registered))
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usb_composite_unregister(&msg_driver);
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}
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module_exit(msg_cleanup);
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