183 lines
4.8 KiB
C
183 lines
4.8 KiB
C
/*
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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 <mina86@mina86.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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/*
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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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.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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/*
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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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/****************************** 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;
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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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static const struct fsg_operations ops = {
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.thread_exits = msg_thread_exits,
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};
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static struct fsg_common common;
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struct fsg_common *retp;
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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.ops = &ops;
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retp = fsg_common_init(&common, c->cdev, &config);
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if (IS_ERR(retp))
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return PTR_ERR(retp);
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ret = fsg_bind_config(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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.bConfigurationValue = 1,
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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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int status;
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status = usb_add_config(cdev, &msg_config_driver, msg_do_config);
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if (status < 0)
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return status;
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dev_info(&cdev->gadget->dev,
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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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.iProduct = DRIVER_DESC,
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.max_speed = USB_SPEED_SUPER,
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.needs_serial = 1,
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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_probe(&msg_driver, msg_bind);
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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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