libusbgx-0.2.0
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gadget-ms.c

This is an example of how to create gadget with mass storage function with two luns.

/*
* Copyright (C) 2014 Samsung Electronics
*
* Krzysztof Opasiak <k.opasiak@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.
*/
#include <errno.h>
#include <stdio.h>
#include <linux/usb/ch9.h>
#include <usbg/usbg.h>
#include <usbg/function/ms.h>
#define VENDOR 0x1d6b
#define PRODUCT 0x0104
int main(int argc, char **argv)
{
int ret = -EINVAL;
int usbg_ret;
struct usbg_gadget_attrs g_attrs = {
.bcdUSB = 0x0200,
.bDeviceClass = USB_CLASS_PER_INTERFACE,
.bDeviceSubClass = 0x00,
.bDeviceProtocol = 0x00,
.bMaxPacketSize0 = 64, /* Max allowed ep0 packet size */
.idVendor = VENDOR,
.idProduct = PRODUCT,
.bcdDevice = 0x0001, /* Verson of device */
};
struct usbg_gadget_strs g_strs = {
.serial = "0123456789", /* Serial number */
.manufacturer = "Foo Inc.", /* Manufacturer */
.product = "Bar Gadget" /* Product string */
};
struct usbg_f_ms_lun_attrs f_ms_luns_array[] = {
{
.id = -1, /* allows to place in any position */
.cdrom = 1,
.ro = 0,
.nofua = 0,
.removable = 1,
.file = "",
}, {
.id = -1, /* allows to place in any position */
.cdrom = 0,
.ro = 0,
.nofua = 0,
.removable = 1,
.file = argv[1],
}
};
struct usbg_f_ms_lun_attrs *f_ms_luns[] = {
/*
* When id in lun structure is below 0 we can place it in any
* arbitrary position
*/
&f_ms_luns_array[1],
&f_ms_luns_array[0],
NULL,
};
struct usbg_f_ms_attrs f_attrs = {
.stall = 0,
.nluns = 2,
.luns = f_ms_luns,
};
struct usbg_config_strs c_strs = {
"1xMass Storage"
};
if (argc < 2) {
fprintf(stderr, "Usage: gadget-ms file\n");
goto out1;
}
usbg_ret = usbg_init("/sys/kernel/config", &s);
if (usbg_ret != USBG_SUCCESS) {
fprintf(stderr, "Error on USB gadget init\n");
fprintf(stderr, "Error: %s : %s\n", usbg_error_name(usbg_ret),
usbg_strerror(usbg_ret));
goto out1;
}
usbg_ret = usbg_create_gadget(s, "g1", &g_attrs, &g_strs, &g);
if (usbg_ret != USBG_SUCCESS) {
fprintf(stderr, "Error on create gadget\n");
fprintf(stderr, "Error: %s : %s\n", usbg_error_name(usbg_ret),
usbg_strerror(usbg_ret));
goto out2;
}
usbg_ret = usbg_create_function(g, USBG_F_MASS_STORAGE, "my_reader",
&f_attrs, &f_ms);
if (usbg_ret != USBG_SUCCESS) {
fprintf(stderr, "Error creating mass storage function\n");
fprintf(stderr, "Error: %s : %s\n", usbg_error_name(usbg_ret),
usbg_strerror(usbg_ret));
goto out2;
}
/* NULL can be passed to use kernel defaults */
usbg_ret = usbg_create_config(g, 1, "The only one", NULL, &c_strs, &c);
if (usbg_ret != USBG_SUCCESS) {
fprintf(stderr, "Error creating config\n");
fprintf(stderr, "Error: %s : %s\n", usbg_error_name(usbg_ret),
usbg_strerror(usbg_ret));
goto out2;
}
usbg_ret = usbg_add_config_function(c, "some_name_here", f_ms);
if (usbg_ret != USBG_SUCCESS) {
fprintf(stderr, "Error adding ms function\n");
fprintf(stderr, "Error: %s : %s\n", usbg_error_name(usbg_ret),
usbg_strerror(usbg_ret));
goto out2;
}
usbg_ret = usbg_enable_gadget(g, DEFAULT_UDC);
if (usbg_ret != USBG_SUCCESS) {
fprintf(stderr, "Error enabling gadget\n");
fprintf(stderr, "Error: %s : %s\n", usbg_error_name(usbg_ret),
usbg_strerror(usbg_ret));
goto out2;
}
ret = 0;
out2:
out1:
return ret;
}
int usbg_create_gadget(usbg_state *s, const char *name, const struct usbg_gadget_attrs *g_attrs, const struct usbg_gadget_strs *g_strs, usbg_gadget **g)
Create a new USB gadget device and set given attributes and strings.
Definition usbg.c:1527
const char * usbg_strerror(usbg_error e)
Get the short description of error.
Definition usbg_error.c:123
int usbg_add_config_function(usbg_config *c, const char *name, usbg_function *f)
Add a function to a configuration.
Definition usbg.c:2363
int usbg_create_config(usbg_gadget *g, int id, const char *label, const struct usbg_config_attrs *c_attrs, const struct usbg_config_strs *c_strs, usbg_config **c)
Create a new USB gadget configuration.
Definition usbg.c:2174
int usbg_enable_gadget(usbg_gadget *g, usbg_udc *udc)
Enable a USB gadget device.
Definition usbg.c:2543
int usbg_init(const char *configfs_path, usbg_state **state)
Initialize the libusbgx library state.
Definition usbg.c:1086
void usbg_cleanup(usbg_state *s)
Clean up the libusbgx library state.
Definition usbg.c:1131
int usbg_create_function(usbg_gadget *g, usbg_function_type type, const char *instance, void *f_attrs, usbg_function **f)
Create a new USB gadget function and set its attributes.
Definition usbg.c:2046
const char * usbg_error_name(usbg_error e)
Get the error name as a constant string.
Definition usbg_error.c:62
USB configuration strings.
Definition usbg.h:196
USB gadget device attributes.
Definition usbg.h:132
USB gadget device strings.
Definition usbg.h:155
Definition usbg_internal.h:117
Definition usbg_internal.h:129
Definition usbg_internal.h:103
Definition usbg_internal.h:93