summaryrefslogtreecommitdiffstats
path: root/drivers/usb/gadget/legacy/serial.c
blob: 9d89adce756d1a708dfffca03824fb465cb219e0 (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
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
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
/*
 * serial.c -- USB gadget serial driver
 *
 * Copyright (C) 2003 Al Borchers (alborchers@steinerpoint.com)
 * Copyright (C) 2008 by David Brownell
 * Copyright (C) 2008 by Nokia Corporation
 *
 * This software is distributed under the terms of the GNU General
 * Public License ("GPL") as published by the Free Software Foundation,
 * either version 2 of that License or (at your option) any later version.
 */

#include <linux/kernel.h>
#include <linux/device.h>
#include <linux/module.h>
#include <linux/tty.h>
#include <linux/tty_flip.h>

#include "u_serial.h"


/* Defines */

#define GS_VERSION_STR			"v2.4"
#define GS_VERSION_NUM			0x2400

#define GS_LONG_NAME			"Gadget Serial"
#define GS_VERSION_NAME			GS_LONG_NAME " " GS_VERSION_STR

/*-------------------------------------------------------------------------*/
USB_GADGET_COMPOSITE_OPTIONS();

/* Thanks to NetChip Technologies for donating this product ID.
*
* DO NOT REUSE THESE IDs with a protocol-incompatible driver!!  Ever!!
* Instead:  allocate your own, using normal USB-IF procedures.
*/
#define GS_VENDOR_ID			0x0525	/* NetChip */
#define GS_PRODUCT_ID			0xa4a6	/* Linux-USB Serial Gadget */
#define GS_CDC_PRODUCT_ID		0xa4a7	/* ... as CDC-ACM */
#define GS_CDC_OBEX_PRODUCT_ID		0xa4a9	/* ... as CDC-OBEX */

/* string IDs are assigned dynamically */

#define STRING_DESCRIPTION_IDX		USB_GADGET_FIRST_AVAIL_IDX

static struct usb_string strings_dev[] = {
	[USB_GADGET_MANUFACTURER_IDX].s = "",
	[USB_GADGET_PRODUCT_IDX].s = GS_VERSION_NAME,
	[USB_GADGET_SERIAL_IDX].s = "",
	[STRING_DESCRIPTION_IDX].s = NULL /* updated; f(use_acm) */,
	{  } /* end of list */
};

static struct usb_gadget_strings stringtab_dev = {
	.language	= 0x0409,	/* en-us */
	.strings	= strings_dev,
};

static struct usb_gadget_strings *dev_strings[] = {
	&stringtab_dev,
	NULL,
};

static struct usb_device_descriptor device_desc = {
	.bLength =		USB_DT_DEVICE_SIZE,
	.bDescriptorType =	USB_DT_DEVICE,
	/* .bcdUSB = DYNAMIC */
	/* .bDeviceClass = f(use_acm) */
	.bDeviceSubClass =	0,
	.bDeviceProtocol =	0,
	/* .bMaxPacketSize0 = f(hardware) */
	.idVendor =		cpu_to_le16(GS_VENDOR_ID),
	/* .idProduct =	f(use_acm) */
	.bcdDevice = cpu_to_le16(GS_VERSION_NUM),
	/* .iManufacturer = DYNAMIC */
	/* .iProduct = DYNAMIC */
	.bNumConfigurations =	1,
};

static const struct usb_descriptor_header *otg_desc[2];

/*-------------------------------------------------------------------------*/

/* Module */
MODULE_DESCRIPTION(GS_VERSION_NAME);
MODULE_AUTHOR("Al Borchers");
MODULE_AUTHOR("David Brownell");
MODULE_LICENSE("GPL");

static bool use_acm = true;
module_param(use_acm, bool, 0);
MODULE_PARM_DESC(use_acm, "Use CDC ACM, default=yes");

static bool use_obex = false;
module_param(use_obex, bool, 0);
MODULE_PARM_DESC(use_obex, "Use CDC OBEX, default=no");

static unsigned n_ports = 1;
module_param(n_ports, uint, 0);
MODULE_PARM_DESC(n_ports, "number of ports to create, default=1");

/*-------------------------------------------------------------------------*/

static struct usb_configuration serial_config_driver = {
	/* .label = f(use_acm) */
	/* .bConfigurationValue = f(use_acm) */
	/* .iConfiguration = DYNAMIC */
	.bmAttributes	= USB_CONFIG_ATT_SELFPOWER,
};

static struct usb_function_instance *fi_serial[MAX_U_SERIAL_PORTS];
static struct usb_function *f_serial[MAX_U_SERIAL_PORTS];

static int serial_register_ports(struct usb_composite_dev *cdev,
		struct usb_configuration *c, const char *f_name)
{
	int i;
	int ret;

	ret = usb_add_config_only(cdev, c);
	if (ret)
		goto out;

	for (i = 0; i < n_ports; i++) {

		fi_serial[i] = usb_get_function_instance(f_name);
		if (IS_ERR(fi_serial[i])) {
			ret = PTR_ERR(fi_serial[i]);
			goto fail;
		}

		f_serial[i] = usb_get_function(fi_serial[i]);
		if (IS_ERR(f_serial[i])) {
			ret = PTR_ERR(f_serial[i]);
			goto err_get_func;
		}

		ret = usb_add_function(c, f_serial[i]);
		if (ret)
			goto err_add_func;
	}

	return 0;

err_add_func:
	usb_put_function(f_serial[i]);
err_get_func:
	usb_put_function_instance(fi_serial[i]);

fail:
	i--;
	while (i >= 0) {
		usb_remove_function(c, f_serial[i]);
		usb_put_function(f_serial[i]);
		usb_put_function_instance(fi_serial[i]);
		i--;
	}
out:
	return ret;
}

static int gs_bind(struct usb_composite_dev *cdev)
{
	int			status;

	/* Allocate string descriptor numbers ... note that string
	 * contents can be overridden by the composite_dev glue.
	 */

	status = usb_string_ids_tab(cdev, strings_dev);
	if (status < 0)
		goto fail;
	device_desc.iManufacturer = strings_dev[USB_GADGET_MANUFACTURER_IDX].id;
	device_desc.iProduct = strings_dev[USB_GADGET_PRODUCT_IDX].id;
	status = strings_dev[STRING_DESCRIPTION_IDX].id;
	serial_config_driver.iConfiguration = status;

	if (gadget_is_otg(cdev->gadget)) {
		if (!otg_desc[0]) {
			struct usb_descriptor_header *usb_desc;

			usb_desc = usb_otg_descriptor_alloc(cdev->gadget);
			if (!usb_desc) {
				status = -ENOMEM;
				goto fail;
			}
			usb_otg_descriptor_init(cdev->gadget, usb_desc);
			otg_desc[0] = usb_desc;
			otg_desc[1] = NULL;
		}
		serial_config_driver.descriptors = otg_desc;
		serial_config_driver.bmAttributes |= USB_CONFIG_ATT_WAKEUP;
	}

	/* register our configuration */
	if (use_acm) {
		status  = serial_register_ports(cdev, &serial_config_driver,
				"acm");
		usb_ep_autoconfig_reset(cdev->gadget);
	} else if (use_obex)
		status = serial_register_ports(cdev, &serial_config_driver,
				"obex");
	else {
		status = serial_register_ports(cdev, &serial_config_driver,
				"gser");
	}
	if (status < 0)
		goto fail1;

	usb_composite_overwrite_options(cdev, &coverwrite);
	INFO(cdev, "%s\n", GS_VERSION_NAME);

	return 0;
fail1:
	kfree(otg_desc[0]);
	otg_desc[0] = NULL;
fail:
	return status;
}

static int gs_unbind(struct usb_composite_dev *cdev)
{
	int i;

	for (i = 0; i < n_ports; i++) {
		usb_put_function(f_serial[i]);
		usb_put_function_instance(fi_serial[i]);
	}

	kfree(otg_desc[0]);
	otg_desc[0] = NULL;

	return 0;
}

static struct usb_composite_driver gserial_driver = {
	.name		= "g_serial",
	.dev		= &device_desc,
	.strings	= dev_strings,
	.max_speed	= USB_SPEED_SUPER,
	.bind		= gs_bind,
	.unbind		= gs_unbind,
};

static int __init init(void)
{
	/* We *could* export two configs; that'd be much cleaner...
	 * but neither of these product IDs was defined that way.
	 */
	if (use_acm) {
		serial_config_driver.label = "CDC ACM config";
		serial_config_driver.bConfigurationValue = 2;
		device_desc.bDeviceClass = USB_CLASS_COMM;
		device_desc.idProduct =
				cpu_to_le16(GS_CDC_PRODUCT_ID);
	} else if (use_obex) {
		serial_config_driver.label = "CDC OBEX config";
		serial_config_driver.bConfigurationValue = 3;
		device_desc.bDeviceClass = USB_CLASS_COMM;
		device_desc.idProduct =
			cpu_to_le16(GS_CDC_OBEX_PRODUCT_ID);
	} else {
		serial_config_driver.label = "Generic Serial config";
		serial_config_driver.bConfigurationValue = 1;
		device_desc.bDeviceClass = USB_CLASS_VENDOR_SPEC;
		device_desc.idProduct =
				cpu_to_le16(GS_PRODUCT_ID);
	}
	strings_dev[STRING_DESCRIPTION_IDX].s = serial_config_driver.label;

	return usb_composite_probe(&gserial_driver);
}
module_init(init);

static void __exit cleanup(void)
{
	usb_composite_unregister(&gserial_driver);
}
module_exit(cleanup);