summaryrefslogtreecommitdiff
path: root/drivers/usb/gadget/legacy/tcm_usb_gadget.c
blob: 0b0bb98319cdcb617e8f0a20623b2b81220ae3df (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
/* Target based USB-Gadget
 *
 * UAS protocol handling, target callbacks, configfs handling,
 * BBB (USB Mass Storage Class Bulk-Only (BBB) and Transport protocol handling.
 *
 * Author: Sebastian Andrzej Siewior <bigeasy at linutronix dot de>
 * License: GPLv2 as published by FSF.
 */
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/string.h>
#include <linux/configfs.h>
#include <linux/ctype.h>
#include <linux/usb/ch9.h>
#include <linux/usb/composite.h>
#include <linux/usb/gadget.h>
#include <linux/usb/storage.h>
#include <scsi/scsi_tcq.h>
#include <target/target_core_base.h>
#include <target/target_core_fabric.h>
#include <asm/unaligned.h>

#include "u_tcm.h"

USB_GADGET_COMPOSITE_OPTIONS();

#define UAS_VENDOR_ID	0x0525	/* NetChip */
#define UAS_PRODUCT_ID	0xa4a5	/* Linux-USB File-backed Storage Gadget */

static struct usb_device_descriptor usbg_device_desc = {
	.bLength =		sizeof(usbg_device_desc),
	.bDescriptorType =	USB_DT_DEVICE,
	/* .bcdUSB = DYNAMIC */
	.bDeviceClass =		USB_CLASS_PER_INTERFACE,
	.idVendor =		cpu_to_le16(UAS_VENDOR_ID),
	.idProduct =		cpu_to_le16(UAS_PRODUCT_ID),
	.bNumConfigurations =   1,
};

#define USB_G_STR_CONFIG USB_GADGET_FIRST_AVAIL_IDX

static struct usb_string	usbg_us_strings[] = {
	[USB_GADGET_MANUFACTURER_IDX].s	= "Target Manufactor",
	[USB_GADGET_PRODUCT_IDX].s	= "Target Product",
	[USB_GADGET_SERIAL_IDX].s	= "000000000001",
	[USB_G_STR_CONFIG].s		= "default config",
	{ },
};

static struct usb_gadget_strings usbg_stringtab = {
	.language = 0x0409,
	.strings = usbg_us_strings,
};

static struct usb_gadget_strings *usbg_strings[] = {
	&usbg_stringtab,
	NULL,
};

static struct usb_function_instance *fi_tcm;
static struct usb_function *f_tcm;

static int guas_unbind(struct usb_composite_dev *cdev)
{
	if (!IS_ERR_OR_NULL(f_tcm))
		usb_put_function(f_tcm);

	return 0;
}

static int tcm_do_config(struct usb_configuration *c)
{
	int status;

	f_tcm = usb_get_function(fi_tcm);
	if (IS_ERR(f_tcm))
		return PTR_ERR(f_tcm);

	status = usb_add_function(c, f_tcm);
	if (status < 0) {
		usb_put_function(f_tcm);
		return status;
	}

	return 0;
}

static struct usb_configuration usbg_config_driver = {
	.label                  = "Linux Target",
	.bConfigurationValue    = 1,
	.bmAttributes           = USB_CONFIG_ATT_SELFPOWER,
};

static int usbg_attach(struct usb_function_instance *f);
static void usbg_detach(struct usb_function_instance *f);

static int usb_target_bind(struct usb_composite_dev *cdev)
{
	int ret;

	ret = usb_string_ids_tab(cdev, usbg_us_strings);
	if (ret)
		return ret;

	usbg_device_desc.iManufacturer =
		usbg_us_strings[USB_GADGET_MANUFACTURER_IDX].id;
	usbg_device_desc.iProduct = usbg_us_strings[USB_GADGET_PRODUCT_IDX].id;
	usbg_device_desc.iSerialNumber =
		usbg_us_strings[USB_GADGET_SERIAL_IDX].id;
	usbg_config_driver.iConfiguration =
		usbg_us_strings[USB_G_STR_CONFIG].id;

	ret = usb_add_config(cdev, &usbg_config_driver, tcm_do_config);
	if (ret)
		return ret;
	usb_composite_overwrite_options(cdev, &coverwrite);
	return 0;
}

static struct usb_composite_driver usbg_driver = {
	.name           = "g_target",
	.dev            = &usbg_device_desc,
	.strings        = usbg_strings,
	.max_speed      = USB_SPEED_SUPER,
	.bind		= usb_target_bind,
	.unbind         = guas_unbind,
};

static int usbg_attach(struct usb_function_instance *f)
{
	return usb_composite_probe(&usbg_driver);
}

static void usbg_detach(struct usb_function_instance *f)
{
	usb_composite_unregister(&usbg_driver);
}

static int __init usb_target_gadget_init(void)
{
	struct f_tcm_opts *tcm_opts;

	fi_tcm = usb_get_function_instance("tcm");
	if (IS_ERR(fi_tcm))
		return PTR_ERR(fi_tcm);

	tcm_opts = container_of(fi_tcm, struct f_tcm_opts, func_inst);
	mutex_lock(&tcm_opts->dep_lock);
	tcm_opts->tcm_register_callback = usbg_attach;
	tcm_opts->tcm_unregister_callback = usbg_detach;
	tcm_opts->dependent = THIS_MODULE;
	tcm_opts->can_attach = true;
	tcm_opts->has_dep = true;
	mutex_unlock(&tcm_opts->dep_lock);

	fi_tcm->set_inst_name(fi_tcm, "tcm-legacy");

	return 0;
}
module_init(usb_target_gadget_init);

static void __exit usb_target_gadget_exit(void)
{
	if (!IS_ERR_OR_NULL(fi_tcm))
		usb_put_function_instance(fi_tcm);

}
module_exit(usb_target_gadget_exit);

MODULE_AUTHOR("Sebastian Andrzej Siewior <bigeasy@linutronix.de>");
MODULE_DESCRIPTION("usb-gadget fabric");
MODULE_LICENSE("GPL v2");