1 /*
2 * serial.c -- USB gadget serial driver
3 *
4 * Copyright (C) 2003 Al Borchers (alborchers@steinerpoint.com)
5 * Copyright (C) 2008 by David Brownell
6 * Copyright (C) 2008 by Nokia Corporation
7 *
8 * This software is distributed under the terms of the GNU General
9 * Public License ("GPL") as published by the Free Software Foundation,
10 * either version 2 of that License or (at your option) any later version.
11 */
12
13 #include <linux/kernel.h>
14 #include <linux/utsname.h>
15 #include <linux/device.h>
16 #include <linux/tty.h>
17 #include <linux/tty_flip.h>
18
19 #include "u_serial.h"
20 #include "gadget_chips.h"
21
22
23 /* Defines */
24
25 #define GS_VERSION_STR "v2.4"
26 #define GS_VERSION_NUM 0x2400
27
28 #define GS_LONG_NAME "Gadget Serial"
29 #define GS_VERSION_NAME GS_LONG_NAME " " GS_VERSION_STR
30
31 /*-------------------------------------------------------------------------*/
32
33 /*
34 * Kbuild is not very cooperative with respect to linking separately
35 * compiled library objects into one module. So for now we won't use
36 * separate compilation ... ensuring init/exit sections work to shrink
37 * the runtime footprint, and giving us at least some parts of what
38 * a "gcc --combine ... part1.c part2.c part3.c ... " build would.
39 */
40 #include "composite.c"
41 #include "usbstring.c"
42 #include "config.c"
43 #include "epautoconf.c"
44
45 #include "f_acm.c"
46 #include "f_obex.c"
47 #include "f_serial.c"
48 #include "u_serial.c"
49
50 /*-------------------------------------------------------------------------*/
51
52 /* Thanks to NetChip Technologies for donating this product ID.
53 *
54 * DO NOT REUSE THESE IDs with a protocol-incompatible driver!! Ever!!
55 * Instead: allocate your own, using normal USB-IF procedures.
56 */
57 #define GS_VENDOR_ID 0x0525 /* NetChip */
58 #define GS_PRODUCT_ID 0xa4a6 /* Linux-USB Serial Gadget */
59 #define GS_CDC_PRODUCT_ID 0xa4a7 /* ... as CDC-ACM */
60 #define GS_CDC_OBEX_PRODUCT_ID 0xa4a9 /* ... as CDC-OBEX */
61
62 /* string IDs are assigned dynamically */
63
64 #define STRING_MANUFACTURER_IDX 0
65 #define STRING_PRODUCT_IDX 1
66 #define STRING_DESCRIPTION_IDX 2
67
68 static char manufacturer[50];
69
70 static struct usb_string strings_dev[] = {
71 [STRING_MANUFACTURER_IDX].s = manufacturer,
72 [STRING_PRODUCT_IDX].s = GS_VERSION_NAME,
73 [STRING_DESCRIPTION_IDX].s = NULL /* updated; f(use_acm) */,
74 { } /* end of list */
75 };
76
77 static struct usb_gadget_strings stringtab_dev = {
78 .language = 0x0409, /* en-us */
79 .strings = strings_dev,
80 };
81
82 static struct usb_gadget_strings *dev_strings[] = {
83 &stringtab_dev,
84 NULL,
85 };
86
87 static struct usb_device_descriptor device_desc = {
88 .bLength = USB_DT_DEVICE_SIZE,
89 .bDescriptorType = USB_DT_DEVICE,
90 .bcdUSB = cpu_to_le16(0x0200),
91 /* .bDeviceClass = f(use_acm) */
92 .bDeviceSubClass = 0,
93 .bDeviceProtocol = 0,
94 /* .bMaxPacketSize0 = f(hardware) */
95 .idVendor = cpu_to_le16(GS_VENDOR_ID),
96 /* .idProduct = f(use_acm) */
97 /* .bcdDevice = f(hardware) */
98 /* .iManufacturer = DYNAMIC */
99 /* .iProduct = DYNAMIC */
100 .bNumConfigurations = 1,
101 };
102
103 static struct usb_otg_descriptor otg_descriptor = {
104 .bLength = sizeof otg_descriptor,
105 .bDescriptorType = USB_DT_OTG,
106
107 /* REVISIT SRP-only hardware is possible, although
108 * it would not be called "OTG" ...
109 */
110 .bmAttributes = USB_OTG_SRP | USB_OTG_HNP,
111 };
112
113 static const struct usb_descriptor_header *otg_desc[] = {
114 (struct usb_descriptor_header *) &otg_descriptor,
115 NULL,
116 };
117
118 /*-------------------------------------------------------------------------*/
119
120 /* Module */
121 MODULE_DESCRIPTION(GS_VERSION_NAME);
122 MODULE_AUTHOR("Al Borchers");
123 MODULE_AUTHOR("David Brownell");
124 MODULE_LICENSE("GPL");
125
126 static int use_acm = true;
127 module_param(use_acm, bool, 0);
128 MODULE_PARM_DESC(use_acm, "Use CDC ACM, default=yes");
129
130 static int use_obex = false;
131 module_param(use_obex, bool, 0);
132 MODULE_PARM_DESC(use_obex, "Use CDC OBEX, default=no");
133
134 static unsigned n_ports = 1;
135 module_param(n_ports, uint, 0);
136 MODULE_PARM_DESC(n_ports, "number of ports to create, default=1");
137
138 /*-------------------------------------------------------------------------*/
139
serial_bind_config(struct usb_configuration * c)140 static int __init serial_bind_config(struct usb_configuration *c)
141 {
142 unsigned i;
143 int status = 0;
144
145 for (i = 0; i < n_ports && status == 0; i++) {
146 if (use_acm)
147 status = acm_bind_config(c, i);
148 else if (use_obex)
149 status = obex_bind_config(c, i);
150 else
151 status = gser_bind_config(c, i);
152 }
153 return status;
154 }
155
156 static struct usb_configuration serial_config_driver = {
157 /* .label = f(use_acm) */
158 /* .bConfigurationValue = f(use_acm) */
159 /* .iConfiguration = DYNAMIC */
160 .bmAttributes = USB_CONFIG_ATT_SELFPOWER,
161 };
162
gs_bind(struct usb_composite_dev * cdev)163 static int __init gs_bind(struct usb_composite_dev *cdev)
164 {
165 int gcnum;
166 struct usb_gadget *gadget = cdev->gadget;
167 int status;
168
169 status = gserial_setup(cdev->gadget, n_ports);
170 if (status < 0)
171 return status;
172
173 /* Allocate string descriptor numbers ... note that string
174 * contents can be overridden by the composite_dev glue.
175 */
176
177 /* device description: manufacturer, product */
178 snprintf(manufacturer, sizeof manufacturer, "%s %s with %s",
179 init_utsname()->sysname, init_utsname()->release,
180 gadget->name);
181 status = usb_string_id(cdev);
182 if (status < 0)
183 goto fail;
184 strings_dev[STRING_MANUFACTURER_IDX].id = status;
185
186 device_desc.iManufacturer = status;
187
188 status = usb_string_id(cdev);
189 if (status < 0)
190 goto fail;
191 strings_dev[STRING_PRODUCT_IDX].id = status;
192
193 device_desc.iProduct = status;
194
195 /* config description */
196 status = usb_string_id(cdev);
197 if (status < 0)
198 goto fail;
199 strings_dev[STRING_DESCRIPTION_IDX].id = status;
200
201 serial_config_driver.iConfiguration = status;
202
203 /* set up other descriptors */
204 gcnum = usb_gadget_controller_number(gadget);
205 if (gcnum >= 0)
206 device_desc.bcdDevice = cpu_to_le16(GS_VERSION_NUM | gcnum);
207 else {
208 /* this is so simple (for now, no altsettings) that it
209 * SHOULD NOT have problems with bulk-capable hardware.
210 * so warn about unrcognized controllers -- don't panic.
211 *
212 * things like configuration and altsetting numbering
213 * can need hardware-specific attention though.
214 */
215 pr_warning("gs_bind: controller '%s' not recognized\n",
216 gadget->name);
217 device_desc.bcdDevice =
218 cpu_to_le16(GS_VERSION_NUM | 0x0099);
219 }
220
221 if (gadget_is_otg(cdev->gadget)) {
222 serial_config_driver.descriptors = otg_desc;
223 serial_config_driver.bmAttributes |= USB_CONFIG_ATT_WAKEUP;
224 }
225
226 /* register our configuration */
227 status = usb_add_config(cdev, &serial_config_driver,
228 serial_bind_config);
229 if (status < 0)
230 goto fail;
231
232 INFO(cdev, "%s\n", GS_VERSION_NAME);
233
234 return 0;
235
236 fail:
237 gserial_cleanup();
238 return status;
239 }
240
241 static struct usb_composite_driver gserial_driver = {
242 .name = "g_serial",
243 .dev = &device_desc,
244 .strings = dev_strings,
245 };
246
init(void)247 static int __init init(void)
248 {
249 /* We *could* export two configs; that'd be much cleaner...
250 * but neither of these product IDs was defined that way.
251 */
252 if (use_acm) {
253 serial_config_driver.label = "CDC ACM config";
254 serial_config_driver.bConfigurationValue = 2;
255 device_desc.bDeviceClass = USB_CLASS_COMM;
256 device_desc.idProduct =
257 cpu_to_le16(GS_CDC_PRODUCT_ID);
258 } else if (use_obex) {
259 serial_config_driver.label = "CDC OBEX config";
260 serial_config_driver.bConfigurationValue = 3;
261 device_desc.bDeviceClass = USB_CLASS_COMM;
262 device_desc.idProduct =
263 cpu_to_le16(GS_CDC_OBEX_PRODUCT_ID);
264 } else {
265 serial_config_driver.label = "Generic Serial config";
266 serial_config_driver.bConfigurationValue = 1;
267 device_desc.bDeviceClass = USB_CLASS_VENDOR_SPEC;
268 device_desc.idProduct =
269 cpu_to_le16(GS_PRODUCT_ID);
270 }
271 strings_dev[STRING_DESCRIPTION_IDX].s = serial_config_driver.label;
272
273 return usb_composite_probe(&gserial_driver, gs_bind);
274 }
275 module_init(init);
276
cleanup(void)277 static void __exit cleanup(void)
278 {
279 usb_composite_unregister(&gserial_driver);
280 gserial_cleanup();
281 }
282 module_exit(cleanup);
283