summaryrefslogtreecommitdiffstats
path: root/drivers/usb/gadget/multi.c
blob: a74ebefc7682c7fe71ae4ec0153bdd7933c237b6 (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
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
/*
 * multi.c -- Multifunction Composite driver
 *
 * Copyright (C) 2008 David Brownell
 * Copyright (C) 2008 Nokia Corporation
 * Copyright (C) 2009 Samsung Electronics
 * Author: Michal Nazarewicz (mina86@mina86.com)
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 */


#include <linux/kernel.h>
#include <linux/module.h>

#include "u_serial.h"
#if defined USB_ETH_RNDIS
#  undef USB_ETH_RNDIS
#endif
#ifdef CONFIG_USB_G_MULTI_RNDIS
#  define USB_ETH_RNDIS y
#endif


#define DRIVER_DESC		"Multifunction Composite Gadget"

MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_AUTHOR("Michal Nazarewicz");
MODULE_LICENSE("GPL");


/***************************** All the files... *****************************/

/*
 * kbuild is not very cooperative with respect to linking separately
 * compiled library objects into one module.  So for now we won't use
 * separate compilation ... ensuring init/exit sections work to shrink
 * the runtime footprint, and giving us at least some parts of what
 * a "gcc --combine ... part1.c part2.c part3.c ... " build would.
 */
#include "f_mass_storage.c"

#include "f_ecm.c"
#include "f_subset.c"
#ifdef USB_ETH_RNDIS
#  include "f_rndis.c"
#  include "rndis.c"
#endif
#include "u_ether.c"

USB_GADGET_COMPOSITE_OPTIONS();

/***************************** Device Descriptor ****************************/

#define MULTI_VENDOR_NUM	0x1d6b	/* Linux Foundation */
#define MULTI_PRODUCT_NUM	0x0104	/* Multifunction Composite Gadget */


enum {
	__MULTI_NO_CONFIG,
#ifdef CONFIG_USB_G_MULTI_RNDIS
	MULTI_RNDIS_CONFIG_NUM,
#endif
#ifdef CONFIG_USB_G_MULTI_CDC
	MULTI_CDC_CONFIG_NUM,
#endif
};


static struct usb_device_descriptor device_desc = {
	.bLength =		sizeof device_desc,
	.bDescriptorType =	USB_DT_DEVICE,

	.bcdUSB =		cpu_to_le16(0x0200),

	.bDeviceClass =		USB_CLASS_MISC /* 0xEF */,
	.bDeviceSubClass =	2,
	.bDeviceProtocol =	1,

	/* Vendor and product id can be overridden by module parameters.  */
	.idVendor =		cpu_to_le16(MULTI_VENDOR_NUM),
	.idProduct =		cpu_to_le16(MULTI_PRODUCT_NUM),
};


static const struct usb_descriptor_header *otg_desc[] = {
	(struct usb_descriptor_header *) &(struct usb_otg_descriptor){
		.bLength =		sizeof(struct usb_otg_descriptor),
		.bDescriptorType =	USB_DT_OTG,

		/*
		 * REVISIT SRP-only hardware is possible, although
		 * it would not be called "OTG" ...
		 */
		.bmAttributes =		USB_OTG_SRP | USB_OTG_HNP,
	},
	NULL,
};


enum {
	MULTI_STRING_RNDIS_CONFIG_IDX = USB_GADGET_FIRST_AVAIL_IDX,
	MULTI_STRING_CDC_CONFIG_IDX,
};

static struct usb_string strings_dev[] = {
	[USB_GADGET_MANUFACTURER_IDX].s = "",
	[USB_GADGET_PRODUCT_IDX].s = DRIVER_DESC,
	[USB_GADGET_SERIAL_IDX].s = "",
	[MULTI_STRING_RNDIS_CONFIG_IDX].s = "Multifunction with RNDIS",
	[MULTI_STRING_CDC_CONFIG_IDX].s   = "Multifunction with CDC ECM",
	{  } /* end of list */
};

static struct usb_gadget_strings *dev_strings[] = {
	&(struct usb_gadget_strings){
		.language	= 0x0409,	/* en-us */
		.strings	= strings_dev,
	},
	NULL,
};




/****************************** Configurations ******************************/

static struct fsg_module_parameters fsg_mod_data = { .stall = 1 };
FSG_MODULE_PARAMETERS(/* no prefix */, fsg_mod_data);

static struct fsg_common fsg_common;

static u8 hostaddr[ETH_ALEN];

static struct usb_function_instance *fi_acm;
static struct eth_dev *the_dev;

/********** RNDIS **********/

#ifdef USB_ETH_RNDIS
static struct usb_function *f_acm_rndis;

static __init int rndis_do_config(struct usb_configuration *c)
{
	int ret;

	if (gadget_is_otg(c->cdev->gadget)) {
		c->descriptors = otg_desc;
		c->bmAttributes |= USB_CONFIG_ATT_WAKEUP;
	}

	ret = rndis_bind_config(c, hostaddr, the_dev);
	if (ret < 0)
		return ret;

	f_acm_rndis = usb_get_function(fi_acm);
	if (IS_ERR(f_acm_rndis))
		goto err_func_acm;

	ret = usb_add_function(c, f_acm_rndis);
	if (ret)
		goto err_conf;

	ret = fsg_bind_config(c->cdev, c, &fsg_common);
	if (ret < 0)
		goto err_fsg;

	return 0;
err_fsg:
	usb_remove_function(c, f_acm_rndis);
err_conf:
	usb_put_function(f_acm_rndis);
err_func_acm:
	return ret;
}

static int rndis_config_register(struct usb_composite_dev *cdev)
{
	static struct usb_configuration config = {
		.bConfigurationValue	= MULTI_RNDIS_CONFIG_NUM,
		.bmAttributes		= USB_CONFIG_ATT_SELFPOWER,
	};

	config.label          = strings_dev[MULTI_STRING_RNDIS_CONFIG_IDX].s;
	config.iConfiguration = strings_dev[MULTI_STRING_RNDIS_CONFIG_IDX].id;

	return usb_add_config(cdev, &config, rndis_do_config);
}

#else

static int rndis_config_register(struct usb_composite_dev *cdev)
{
	return 0;
}

#endif


/********** CDC ECM **********/

#ifdef CONFIG_USB_G_MULTI_CDC
static struct usb_function *f_acm_multi;

static __init int cdc_do_config(struct usb_configuration *c)
{
	int ret;

	if (gadget_is_otg(c->cdev->gadget)) {
		c->descriptors = otg_desc;
		c->bmAttributes |= USB_CONFIG_ATT_WAKEUP;
	}

	ret = ecm_bind_config(c, hostaddr, the_dev);
	if (ret < 0)
		return ret;

	/* implicit port_num is zero */
	f_acm_multi = usb_get_function(fi_acm);
	if (IS_ERR(f_acm_multi))
		goto err_func_acm;

	ret = usb_add_function(c, f_acm_multi);
	if (ret)
		goto err_conf;

	ret = fsg_bind_config(c->cdev, c, &fsg_common);
	if (ret < 0)
		goto err_fsg;

	return 0;
err_fsg:
	usb_remove_function(c, f_acm_multi);
err_conf:
	usb_put_function(f_acm_multi);
err_func_acm:
	return ret;
}

static int cdc_config_register(struct usb_composite_dev *cdev)
{
	static struct usb_configuration config = {
		.bConfigurationValue	= MULTI_CDC_CONFIG_NUM,
		.bmAttributes		= USB_CONFIG_ATT_SELFPOWER,
	};

	config.label          = strings_dev[MULTI_STRING_CDC_CONFIG_IDX].s;
	config.iConfiguration = strings_dev[MULTI_STRING_CDC_CONFIG_IDX].id;

	return usb_add_config(cdev, &config, cdc_do_config);
}

#else

static int cdc_config_register(struct usb_composite_dev *cdev)
{
	return 0;
}

#endif



/****************************** Gadget Bind ******************************/

static int __ref multi_bind(struct usb_composite_dev *cdev)
{
	struct usb_gadget *gadget = cdev->gadget;
	int status;

	if (!can_support_ecm(cdev->gadget)) {
		dev_err(&gadget->dev, "controller '%s' not usable\n",
		        gadget->name);
		return -EINVAL;
	}

	/* set up network link layer */
	the_dev = gether_setup(cdev->gadget, hostaddr);
	if (IS_ERR(the_dev))
		return PTR_ERR(the_dev);

	/* set up serial link layer */
	fi_acm = usb_get_function_instance("acm");
	if (IS_ERR(fi_acm)) {
		status = PTR_ERR(fi_acm);
		goto fail0;
	}

	/* set up mass storage function */
	{
		void *retp;
		retp = fsg_common_from_params(&fsg_common, cdev, &fsg_mod_data);
		if (IS_ERR(retp)) {
			status = PTR_ERR(retp);
			goto fail1;
		}
	}

	/* allocate string IDs */
	status = usb_string_ids_tab(cdev, strings_dev);
	if (unlikely(status < 0))
		goto fail2;
	device_desc.iProduct = strings_dev[USB_GADGET_PRODUCT_IDX].id;

	/* register configurations */
	status = rndis_config_register(cdev);
	if (unlikely(status < 0))
		goto fail2;

	status = cdc_config_register(cdev);
	if (unlikely(status < 0))
		goto fail2;
	usb_composite_overwrite_options(cdev, &coverwrite);

	/* we're done */
	dev_info(&gadget->dev, DRIVER_DESC "\n");
	fsg_common_put(&fsg_common);
	return 0;


	/* error recovery */
fail2:
	fsg_common_put(&fsg_common);
fail1:
	usb_put_function_instance(fi_acm);
fail0:
	gether_cleanup(the_dev);
	return status;
}

static int __exit multi_unbind(struct usb_composite_dev *cdev)
{
#ifdef CONFIG_USB_G_MULTI_CDC
	usb_put_function(f_acm_multi);
#endif
#ifdef USB_ETH_RNDIS
	usb_put_function(f_acm_rndis);
#endif
	usb_put_function_instance(fi_acm);
	gether_cleanup(the_dev);
	return 0;
}


/****************************** Some noise ******************************/


static __refdata struct usb_composite_driver multi_driver = {
	.name		= "g_multi",
	.dev		= &device_desc,
	.strings	= dev_strings,
	.max_speed	= USB_SPEED_HIGH,
	.bind		= multi_bind,
	.unbind		= __exit_p(multi_unbind),
	.needs_serial	= 1,
};


static int __init multi_init(void)
{
	return usb_composite_probe(&multi_driver);
}
module_init(multi_init);

static void __exit multi_exit(void)
{
	usb_composite_unregister(&multi_driver);
}
module_exit(multi_exit);
OpenPOWER on IntegriCloud