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1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * printer.c -- Printer gadget driver
4 *
5 * Copyright (C) 2003-2005 David Brownell
6 * Copyright (C) 2006 Craig W. Nadler
7 */
8
9#include <linux/module.h>
10#include <linux/kernel.h>
11#include <asm/byteorder.h>
12
13#include <linux/usb/ch9.h>
14#include <linux/usb/composite.h>
15#include <linux/usb/gadget.h>
16#include <linux/usb/g_printer.h>
17
18USB_GADGET_COMPOSITE_OPTIONS();
19
20#define DRIVER_DESC "Printer Gadget"
21#define DRIVER_VERSION "2015 FEB 17"
22
23static const char shortname [] = "printer";
24
25#include "u_printer.h"
26
27/*-------------------------------------------------------------------------*/
28
29/* DO NOT REUSE THESE IDs with a protocol-incompatible driver!! Ever!!
30 * Instead: allocate your own, using normal USB-IF procedures.
31 */
32
33/* Thanks to NetChip Technologies for donating this product ID.
34 */
35#define PRINTER_VENDOR_NUM 0x0525 /* NetChip */
36#define PRINTER_PRODUCT_NUM 0xa4a8 /* Linux-USB Printer Gadget */
37
38/* Some systems will want different product identifiers published in the
39 * device descriptor, either numbers or strings or both. These string
40 * parameters are in UTF-8 (superset of ASCII's 7 bit characters).
41 */
42
43module_param_named(iSerialNum, coverwrite.serial_number, charp, S_IRUGO);
44MODULE_PARM_DESC(iSerialNum, "1");
45
46static char *iPNPstring;
47module_param(iPNPstring, charp, S_IRUGO);
48MODULE_PARM_DESC(iPNPstring, "MFG:linux;MDL:g_printer;CLS:PRINTER;SN:1;");
49
50/* Number of requests to allocate per endpoint, not used for ep0. */
51static unsigned qlen = 10;
52module_param(qlen, uint, S_IRUGO|S_IWUSR);
53
54#define QLEN qlen
55
56static struct usb_function_instance *fi_printer;
57static struct usb_function *f_printer;
58
59/*-------------------------------------------------------------------------*/
60
61/*
62 * DESCRIPTORS ... most are static, but strings and (full) configuration
63 * descriptors are built on demand.
64 */
65
66static struct usb_device_descriptor device_desc = {
67 .bLength = sizeof device_desc,
68 .bDescriptorType = USB_DT_DEVICE,
69 /* .bcdUSB = DYNAMIC */
70 .bDeviceClass = USB_CLASS_PER_INTERFACE,
71 .bDeviceSubClass = 0,
72 .bDeviceProtocol = 0,
73 .idVendor = cpu_to_le16(PRINTER_VENDOR_NUM),
74 .idProduct = cpu_to_le16(PRINTER_PRODUCT_NUM),
75 .bNumConfigurations = 1
76};
77
78static const struct usb_descriptor_header *otg_desc[2];
79
80/*-------------------------------------------------------------------------*/
81
82/* descriptors that are built on-demand */
83
84static char product_desc [40] = DRIVER_DESC;
85static char serial_num [40] = "1";
86static char *pnp_string =
87 "MFG:linux;MDL:g_printer;CLS:PRINTER;SN:1;";
88
89/* static strings, in UTF-8 */
90static struct usb_string strings [] = {
91 [USB_GADGET_MANUFACTURER_IDX].s = "",
92 [USB_GADGET_PRODUCT_IDX].s = product_desc,
93 [USB_GADGET_SERIAL_IDX].s = serial_num,
94 { } /* end of list */
95};
96
97static struct usb_gadget_strings stringtab_dev = {
98 .language = 0x0409, /* en-us */
99 .strings = strings,
100};
101
102static struct usb_gadget_strings *dev_strings[] = {
103 &stringtab_dev,
104 NULL,
105};
106
107static struct usb_configuration printer_cfg_driver = {
108 .label = "printer",
109 .bConfigurationValue = 1,
110 .bmAttributes = USB_CONFIG_ATT_ONE | USB_CONFIG_ATT_SELFPOWER,
111};
112
113static int printer_do_config(struct usb_configuration *c)
114{
115 struct usb_gadget *gadget = c->cdev->gadget;
116 int status = 0;
117
118 usb_ep_autoconfig_reset(gadget);
119
120 usb_gadget_set_selfpowered(gadget);
121
122 if (gadget_is_otg(gadget)) {
123 printer_cfg_driver.descriptors = otg_desc;
124 printer_cfg_driver.bmAttributes |= USB_CONFIG_ATT_WAKEUP;
125 }
126
127 f_printer = usb_get_function(fi_printer);
128 if (IS_ERR(f_printer))
129 return PTR_ERR(f_printer);
130
131 status = usb_add_function(c, f_printer);
132 if (status < 0)
133 usb_put_function(f_printer);
134
135 return status;
136}
137
138static int printer_bind(struct usb_composite_dev *cdev)
139{
140 struct f_printer_opts *opts;
141 int ret;
142
143 fi_printer = usb_get_function_instance("printer");
144 if (IS_ERR(fi_printer))
145 return PTR_ERR(fi_printer);
146
147 opts = container_of(fi_printer, struct f_printer_opts, func_inst);
148 opts->minor = 0;
149 opts->q_len = QLEN;
150 if (iPNPstring) {
151 opts->pnp_string = kstrdup(iPNPstring, GFP_KERNEL);
152 if (!opts->pnp_string) {
153 ret = -ENOMEM;
154 goto fail_put_func_inst;
155 }
156 opts->pnp_string_allocated = true;
157 /*
158 * we don't free this memory in case of error
159 * as printer cleanup func will do this for us
160 */
161 } else {
162 opts->pnp_string = pnp_string;
163 }
164
165 ret = usb_string_ids_tab(cdev, strings);
166 if (ret < 0)
167 goto fail_put_func_inst;
168
169 device_desc.iManufacturer = strings[USB_GADGET_MANUFACTURER_IDX].id;
170 device_desc.iProduct = strings[USB_GADGET_PRODUCT_IDX].id;
171 device_desc.iSerialNumber = strings[USB_GADGET_SERIAL_IDX].id;
172
173 if (gadget_is_otg(cdev->gadget) && !otg_desc[0]) {
174 struct usb_descriptor_header *usb_desc;
175
176 usb_desc = usb_otg_descriptor_alloc(cdev->gadget);
177 if (!usb_desc) {
178 ret = -ENOMEM;
179 goto fail_put_func_inst;
180 }
181 usb_otg_descriptor_init(cdev->gadget, usb_desc);
182 otg_desc[0] = usb_desc;
183 otg_desc[1] = NULL;
184 }
185
186 ret = usb_add_config(cdev, &printer_cfg_driver, printer_do_config);
187 if (ret)
188 goto fail_free_otg_desc;
189
190 usb_composite_overwrite_options(cdev, &coverwrite);
191 return ret;
192
193fail_free_otg_desc:
194 kfree(otg_desc[0]);
195 otg_desc[0] = NULL;
196fail_put_func_inst:
197 usb_put_function_instance(fi_printer);
198 return ret;
199}
200
201static int printer_unbind(struct usb_composite_dev *cdev)
202{
203 usb_put_function(f_printer);
204 usb_put_function_instance(fi_printer);
205
206 kfree(otg_desc[0]);
207 otg_desc[0] = NULL;
208
209 return 0;
210}
211
212static struct usb_composite_driver printer_driver = {
213 .name = shortname,
214 .dev = &device_desc,
215 .strings = dev_strings,
216 .max_speed = USB_SPEED_SUPER,
217 .bind = printer_bind,
218 .unbind = printer_unbind,
219};
220
221module_usb_composite_driver(printer_driver);
222
223MODULE_DESCRIPTION(DRIVER_DESC);
224MODULE_AUTHOR("Craig Nadler");
225MODULE_LICENSE("GPL");
1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * printer.c -- Printer gadget driver
4 *
5 * Copyright (C) 2003-2005 David Brownell
6 * Copyright (C) 2006 Craig W. Nadler
7 */
8
9#include <linux/module.h>
10#include <linux/kernel.h>
11#include <asm/byteorder.h>
12
13#include <linux/usb/ch9.h>
14#include <linux/usb/composite.h>
15#include <linux/usb/gadget.h>
16#include <linux/usb/g_printer.h>
17
18USB_GADGET_COMPOSITE_OPTIONS();
19
20#define DRIVER_DESC "Printer Gadget"
21#define DRIVER_VERSION "2015 FEB 17"
22
23static const char shortname [] = "printer";
24static const char driver_desc [] = DRIVER_DESC;
25
26#include "u_printer.h"
27
28/*-------------------------------------------------------------------------*/
29
30/* DO NOT REUSE THESE IDs with a protocol-incompatible driver!! Ever!!
31 * Instead: allocate your own, using normal USB-IF procedures.
32 */
33
34/* Thanks to NetChip Technologies for donating this product ID.
35 */
36#define PRINTER_VENDOR_NUM 0x0525 /* NetChip */
37#define PRINTER_PRODUCT_NUM 0xa4a8 /* Linux-USB Printer Gadget */
38
39/* Some systems will want different product identifiers published in the
40 * device descriptor, either numbers or strings or both. These string
41 * parameters are in UTF-8 (superset of ASCII's 7 bit characters).
42 */
43
44module_param_named(iSerialNum, coverwrite.serial_number, charp, S_IRUGO);
45MODULE_PARM_DESC(iSerialNum, "1");
46
47static char *iPNPstring;
48module_param(iPNPstring, charp, S_IRUGO);
49MODULE_PARM_DESC(iPNPstring, "MFG:linux;MDL:g_printer;CLS:PRINTER;SN:1;");
50
51/* Number of requests to allocate per endpoint, not used for ep0. */
52static unsigned qlen = 10;
53module_param(qlen, uint, S_IRUGO|S_IWUSR);
54
55#define QLEN qlen
56
57static struct usb_function_instance *fi_printer;
58static struct usb_function *f_printer;
59
60/*-------------------------------------------------------------------------*/
61
62/*
63 * DESCRIPTORS ... most are static, but strings and (full) configuration
64 * descriptors are built on demand.
65 */
66
67static struct usb_device_descriptor device_desc = {
68 .bLength = sizeof device_desc,
69 .bDescriptorType = USB_DT_DEVICE,
70 /* .bcdUSB = DYNAMIC */
71 .bDeviceClass = USB_CLASS_PER_INTERFACE,
72 .bDeviceSubClass = 0,
73 .bDeviceProtocol = 0,
74 .idVendor = cpu_to_le16(PRINTER_VENDOR_NUM),
75 .idProduct = cpu_to_le16(PRINTER_PRODUCT_NUM),
76 .bNumConfigurations = 1
77};
78
79static const struct usb_descriptor_header *otg_desc[2];
80
81/*-------------------------------------------------------------------------*/
82
83/* descriptors that are built on-demand */
84
85static char product_desc [40] = DRIVER_DESC;
86static char serial_num [40] = "1";
87static char *pnp_string =
88 "MFG:linux;MDL:g_printer;CLS:PRINTER;SN:1;";
89
90/* static strings, in UTF-8 */
91static struct usb_string strings [] = {
92 [USB_GADGET_MANUFACTURER_IDX].s = "",
93 [USB_GADGET_PRODUCT_IDX].s = product_desc,
94 [USB_GADGET_SERIAL_IDX].s = serial_num,
95 { } /* end of list */
96};
97
98static struct usb_gadget_strings stringtab_dev = {
99 .language = 0x0409, /* en-us */
100 .strings = strings,
101};
102
103static struct usb_gadget_strings *dev_strings[] = {
104 &stringtab_dev,
105 NULL,
106};
107
108static struct usb_configuration printer_cfg_driver = {
109 .label = "printer",
110 .bConfigurationValue = 1,
111 .bmAttributes = USB_CONFIG_ATT_ONE | USB_CONFIG_ATT_SELFPOWER,
112};
113
114static int printer_do_config(struct usb_configuration *c)
115{
116 struct usb_gadget *gadget = c->cdev->gadget;
117 int status = 0;
118
119 usb_ep_autoconfig_reset(gadget);
120
121 usb_gadget_set_selfpowered(gadget);
122
123 if (gadget_is_otg(gadget)) {
124 printer_cfg_driver.descriptors = otg_desc;
125 printer_cfg_driver.bmAttributes |= USB_CONFIG_ATT_WAKEUP;
126 }
127
128 f_printer = usb_get_function(fi_printer);
129 if (IS_ERR(f_printer))
130 return PTR_ERR(f_printer);
131
132 status = usb_add_function(c, f_printer);
133 if (status < 0)
134 usb_put_function(f_printer);
135
136 return status;
137}
138
139static int printer_bind(struct usb_composite_dev *cdev)
140{
141 struct f_printer_opts *opts;
142 int ret;
143
144 fi_printer = usb_get_function_instance("printer");
145 if (IS_ERR(fi_printer))
146 return PTR_ERR(fi_printer);
147
148 opts = container_of(fi_printer, struct f_printer_opts, func_inst);
149 opts->minor = 0;
150 opts->q_len = QLEN;
151 if (iPNPstring) {
152 opts->pnp_string = kstrdup(iPNPstring, GFP_KERNEL);
153 if (!opts->pnp_string) {
154 ret = -ENOMEM;
155 goto fail_put_func_inst;
156 }
157 opts->pnp_string_allocated = true;
158 /*
159 * we don't free this memory in case of error
160 * as printer cleanup func will do this for us
161 */
162 } else {
163 opts->pnp_string = pnp_string;
164 }
165
166 ret = usb_string_ids_tab(cdev, strings);
167 if (ret < 0)
168 goto fail_put_func_inst;
169
170 device_desc.iManufacturer = strings[USB_GADGET_MANUFACTURER_IDX].id;
171 device_desc.iProduct = strings[USB_GADGET_PRODUCT_IDX].id;
172 device_desc.iSerialNumber = strings[USB_GADGET_SERIAL_IDX].id;
173
174 if (gadget_is_otg(cdev->gadget) && !otg_desc[0]) {
175 struct usb_descriptor_header *usb_desc;
176
177 usb_desc = usb_otg_descriptor_alloc(cdev->gadget);
178 if (!usb_desc) {
179 ret = -ENOMEM;
180 goto fail_put_func_inst;
181 }
182 usb_otg_descriptor_init(cdev->gadget, usb_desc);
183 otg_desc[0] = usb_desc;
184 otg_desc[1] = NULL;
185 }
186
187 ret = usb_add_config(cdev, &printer_cfg_driver, printer_do_config);
188 if (ret)
189 goto fail_free_otg_desc;
190
191 usb_composite_overwrite_options(cdev, &coverwrite);
192 return ret;
193
194fail_free_otg_desc:
195 kfree(otg_desc[0]);
196 otg_desc[0] = NULL;
197fail_put_func_inst:
198 usb_put_function_instance(fi_printer);
199 return ret;
200}
201
202static int printer_unbind(struct usb_composite_dev *cdev)
203{
204 usb_put_function(f_printer);
205 usb_put_function_instance(fi_printer);
206
207 kfree(otg_desc[0]);
208 otg_desc[0] = NULL;
209
210 return 0;
211}
212
213static struct usb_composite_driver printer_driver = {
214 .name = shortname,
215 .dev = &device_desc,
216 .strings = dev_strings,
217 .max_speed = USB_SPEED_SUPER,
218 .bind = printer_bind,
219 .unbind = printer_unbind,
220};
221
222module_usb_composite_driver(printer_driver);
223
224MODULE_DESCRIPTION(DRIVER_DESC);
225MODULE_AUTHOR("Craig Nadler");
226MODULE_LICENSE("GPL");