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
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
|
// SPDX-License-Identifier: GPL-2.0+
/*
* printer.c -- Printer gadget driver
*
* Copyright (C) 2003-2005 David Brownell
* Copyright (C) 2006 Craig W. Nadler
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <asm/byteorder.h>
#include <linux/usb/ch9.h>
#include <linux/usb/composite.h>
#include <linux/usb/gadget.h>
#include <linux/usb/g_printer.h>
USB_GADGET_COMPOSITE_OPTIONS();
#define DRIVER_DESC "Printer Gadget"
#define DRIVER_VERSION "2015 FEB 17"
static const char shortname [] = "printer";
#include "u_printer.h"
/*-------------------------------------------------------------------------*/
/* DO NOT REUSE THESE IDs with a protocol-incompatible driver!! Ever!!
* Instead: allocate your own, using normal USB-IF procedures.
*/
/* Thanks to NetChip Technologies for donating this product ID.
*/
#define PRINTER_VENDOR_NUM 0x0525 /* NetChip */
#define PRINTER_PRODUCT_NUM 0xa4a8 /* Linux-USB Printer Gadget */
/* Some systems will want different product identifiers published in the
* device descriptor, either numbers or strings or both. These string
* parameters are in UTF-8 (superset of ASCII's 7 bit characters).
*/
module_param_named(iSerialNum, coverwrite.serial_number, charp, S_IRUGO);
MODULE_PARM_DESC(iSerialNum, "1");
static char *iPNPstring;
module_param(iPNPstring, charp, S_IRUGO);
MODULE_PARM_DESC(iPNPstring, "MFG:linux;MDL:g_printer;CLS:PRINTER;SN:1;");
/* Number of requests to allocate per endpoint, not used for ep0. */
static unsigned qlen = 10;
module_param(qlen, uint, S_IRUGO|S_IWUSR);
MODULE_PARM_DESC(qlen, "The number of 8k buffers to use per endpoint");
#define QLEN qlen
static struct usb_function_instance *fi_printer;
static struct usb_function *f_printer;
/*-------------------------------------------------------------------------*/
/*
* DESCRIPTORS ... most are static, but strings and (full) configuration
* descriptors are built on demand.
*/
static struct usb_device_descriptor device_desc = {
.bLength = sizeof device_desc,
.bDescriptorType = USB_DT_DEVICE,
/* .bcdUSB = DYNAMIC */
.bDeviceClass = USB_CLASS_PER_INTERFACE,
.bDeviceSubClass = 0,
.bDeviceProtocol = 0,
.idVendor = cpu_to_le16(PRINTER_VENDOR_NUM),
.idProduct = cpu_to_le16(PRINTER_PRODUCT_NUM),
.bNumConfigurations = 1
};
static const struct usb_descriptor_header *otg_desc[2];
/*-------------------------------------------------------------------------*/
/* descriptors that are built on-demand */
static char product_desc [40] = DRIVER_DESC;
static char serial_num [40] = "1";
static char *pnp_string =
"MFG:linux;MDL:g_printer;CLS:PRINTER;SN:1;";
/* static strings, in UTF-8 */
static struct usb_string strings [] = {
[USB_GADGET_MANUFACTURER_IDX].s = "",
[USB_GADGET_PRODUCT_IDX].s = product_desc,
[USB_GADGET_SERIAL_IDX].s = serial_num,
{ } /* end of list */
};
static struct usb_gadget_strings stringtab_dev = {
.language = 0x0409, /* en-us */
.strings = strings,
};
static struct usb_gadget_strings *dev_strings[] = {
&stringtab_dev,
NULL,
};
static struct usb_configuration printer_cfg_driver = {
.label = "printer",
.bConfigurationValue = 1,
.bmAttributes = USB_CONFIG_ATT_ONE | USB_CONFIG_ATT_SELFPOWER,
};
static int printer_do_config(struct usb_configuration *c)
{
struct usb_gadget *gadget = c->cdev->gadget;
int status = 0;
usb_ep_autoconfig_reset(gadget);
usb_gadget_set_selfpowered(gadget);
if (gadget_is_otg(gadget)) {
printer_cfg_driver.descriptors = otg_desc;
printer_cfg_driver.bmAttributes |= USB_CONFIG_ATT_WAKEUP;
}
f_printer = usb_get_function(fi_printer);
if (IS_ERR(f_printer))
return PTR_ERR(f_printer);
status = usb_add_function(c, f_printer);
if (status < 0)
usb_put_function(f_printer);
return status;
}
static int printer_bind(struct usb_composite_dev *cdev)
{
struct f_printer_opts *opts;
int ret;
fi_printer = usb_get_function_instance("printer");
if (IS_ERR(fi_printer))
return PTR_ERR(fi_printer);
opts = container_of(fi_printer, struct f_printer_opts, func_inst);
opts->minor = 0;
opts->q_len = QLEN;
if (iPNPstring) {
opts->pnp_string = kstrdup(iPNPstring, GFP_KERNEL);
if (!opts->pnp_string) {
ret = -ENOMEM;
goto fail_put_func_inst;
}
opts->pnp_string_allocated = true;
/*
* we don't free this memory in case of error
* as printer cleanup func will do this for us
*/
} else {
opts->pnp_string = pnp_string;
}
ret = usb_string_ids_tab(cdev, strings);
if (ret < 0)
goto fail_put_func_inst;
device_desc.iManufacturer = strings[USB_GADGET_MANUFACTURER_IDX].id;
device_desc.iProduct = strings[USB_GADGET_PRODUCT_IDX].id;
device_desc.iSerialNumber = strings[USB_GADGET_SERIAL_IDX].id;
if (gadget_is_otg(cdev->gadget) && !otg_desc[0]) {
struct usb_descriptor_header *usb_desc;
usb_desc = usb_otg_descriptor_alloc(cdev->gadget);
if (!usb_desc) {
ret = -ENOMEM;
goto fail_put_func_inst;
}
usb_otg_descriptor_init(cdev->gadget, usb_desc);
otg_desc[0] = usb_desc;
otg_desc[1] = NULL;
}
ret = usb_add_config(cdev, &printer_cfg_driver, printer_do_config);
if (ret)
goto fail_free_otg_desc;
usb_composite_overwrite_options(cdev, &coverwrite);
return ret;
fail_free_otg_desc:
kfree(otg_desc[0]);
otg_desc[0] = NULL;
fail_put_func_inst:
usb_put_function_instance(fi_printer);
return ret;
}
static int printer_unbind(struct usb_composite_dev *cdev)
{
usb_put_function(f_printer);
usb_put_function_instance(fi_printer);
kfree(otg_desc[0]);
otg_desc[0] = NULL;
return 0;
}
static struct usb_composite_driver printer_driver = {
.name = shortname,
.dev = &device_desc,
.strings = dev_strings,
.max_speed = USB_SPEED_SUPER,
.bind = printer_bind,
.unbind = printer_unbind,
};
module_usb_composite_driver(printer_driver);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_AUTHOR("Craig Nadler");
MODULE_LICENSE("GPL");
|
