summaryrefslogtreecommitdiffstats
path: root/drivers/usb/gadget/multi.c
blob: 4fdaa54a2a2a395a2fa8804cdce9ffab4daa14c5 (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
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
/*
 * 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 <linux/netdevice.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");


#include "f_mass_storage.h"

#include "u_ecm.h"
#ifdef USB_ETH_RNDIS
#  include "u_rndis.h"
#  include "rndis.h"
#endif
#include "u_ether.h"

USB_GADGET_COMPOSITE_OPTIONS();

USB_ETHERNET_MODULE_PARAMETERS();

/***************************** 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 };
#ifdef CONFIG_USB_GADGET_DEBUG_FILES

static unsigned int fsg_num_buffers = CONFIG_USB_GADGET_STORAGE_NUM_BUFFERS;

#else

/*
 * Number of buffers we will use.
 * 2 is usually enough for good buffering pipeline
 */
#define fsg_num_buffers	CONFIG_USB_GADGET_STORAGE_NUM_BUFFERS

#endif /* CONFIG_USB_DEBUG */

FSG_MODULE_PARAMETERS(/* no prefix */, fsg_mod_data);

static struct usb_function_instance *fi_acm;
static struct usb_function_instance *fi_msg;

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

#ifdef USB_ETH_RNDIS
static struct usb_function_instance *fi_rndis;
static struct usb_function *f_acm_rndis;
static struct usb_function *f_rndis;
static struct usb_function *f_msg_rndis;

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

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

	f_rndis = usb_get_function(fi_rndis);
	if (IS_ERR(f_rndis))
		return PTR_ERR(f_rndis);

	ret = usb_add_function(c, f_rndis);
	if (ret < 0)
		goto err_func_rndis;

	f_acm_rndis = usb_get_function(fi_acm);
	if (IS_ERR(f_acm_rndis)) {
		ret = PTR_ERR(f_acm_rndis);
		goto err_func_acm;
	}

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

	f_msg_rndis = usb_get_function(fi_msg);
	if (IS_ERR(f_msg_rndis)) {
		ret = PTR_ERR(f_msg_rndis);
		goto err_fsg;
	}

	fsg_opts = fsg_opts_from_func_inst(fi_msg);
	ret = fsg_common_run_thread(fsg_opts->common);
	if (ret)
		goto err_run;

	ret = usb_add_function(c, f_msg_rndis);
	if (ret)
		goto err_run;

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

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

#endif


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

#ifdef CONFIG_USB_G_MULTI_CDC
static struct usb_function_instance *fi_ecm;
static struct usb_function *f_acm_multi;
static struct usb_function *f_ecm;
static struct usb_function *f_msg_multi;

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

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

	f_ecm = usb_get_function(fi_ecm);
	if (IS_ERR(f_ecm))
		return PTR_ERR(f_ecm);

	ret = usb_add_function(c, f_ecm);
	if (ret < 0)
		goto err_func_ecm;

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

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

	f_msg_multi = usb_get_function(fi_msg);
	if (IS_ERR(f_msg_multi)) {
		ret = PTR_ERR(f_msg_multi);
		goto err_fsg;
	}

	fsg_opts = fsg_opts_from_func_inst(fi_msg);
	ret = fsg_common_run_thread(fsg_opts->common);
	if (ret)
		goto err_run;

	ret = usb_add_function(c, f_msg_multi);
	if (ret)
		goto err_run;

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

static __ref 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 __ref 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;
#ifdef CONFIG_USB_G_MULTI_CDC
	struct f_ecm_opts *ecm_opts;
#endif
#ifdef USB_ETH_RNDIS
	struct f_rndis_opts *rndis_opts;
#endif
	struct fsg_opts *fsg_opts;
	struct fsg_config config;
	int status;

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

#ifdef CONFIG_USB_G_MULTI_CDC
	fi_ecm = usb_get_function_instance("ecm");
	if (IS_ERR(fi_ecm))
		return PTR_ERR(fi_ecm);

	ecm_opts = container_of(fi_ecm, struct f_ecm_opts, func_inst);

	gether_set_qmult(ecm_opts->net, qmult);
	if (!gether_set_host_addr(ecm_opts->net, host_addr))
		pr_info("using host ethernet address: %s", host_addr);
	if (!gether_set_dev_addr(ecm_opts->net, dev_addr))
		pr_info("using self ethernet address: %s", dev_addr);
#endif

#ifdef USB_ETH_RNDIS
	fi_rndis = usb_get_function_instance("rndis");
	if (IS_ERR(fi_rndis)) {
		status = PTR_ERR(fi_rndis);
		goto fail;
	}

	rndis_opts = container_of(fi_rndis, struct f_rndis_opts, func_inst);

	gether_set_qmult(rndis_opts->net, qmult);
	if (!gether_set_host_addr(rndis_opts->net, host_addr))
		pr_info("using host ethernet address: %s", host_addr);
	if (!gether_set_dev_addr(rndis_opts->net, dev_addr))
		pr_info("using self ethernet address: %s", dev_addr);
#endif

#if (defined CONFIG_USB_G_MULTI_CDC && defined USB_ETH_RNDIS)
	/*
	 * If both ecm and rndis are selected then:
	 *	1) rndis borrows the net interface from ecm
	 *	2) since the interface is shared it must not be bound
	 *	twice - in ecm's _and_ rndis' binds, so do it here.
	 */
	gether_set_gadget(ecm_opts->net, cdev->gadget);
	status = gether_register_netdev(ecm_opts->net);
	if (status)
		goto fail0;

	rndis_borrow_net(fi_rndis, ecm_opts->net);
	ecm_opts->bound = true;
#endif

	/* 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 */
	fi_msg = usb_get_function_instance("mass_storage");
	if (IS_ERR(fi_msg)) {
		status = PTR_ERR(fi_msg);
		goto fail1;
	}
	fsg_config_from_params(&config, &fsg_mod_data, fsg_num_buffers);
	fsg_opts = fsg_opts_from_func_inst(fi_msg);

	fsg_opts->no_configfs = true;
	status = fsg_common_set_num_buffers(fsg_opts->common, fsg_num_buffers);
	if (status)
		goto fail2;

	status = fsg_common_set_nluns(fsg_opts->common, config.nluns);
	if (status)
		goto fail_set_nluns;

	status = fsg_common_set_cdev(fsg_opts->common, cdev, config.can_stall);
	if (status)
		goto fail_set_cdev;

	fsg_common_set_sysfs(fsg_opts->common, true);
	status = fsg_common_create_luns(fsg_opts->common, &config);
	if (status)
		goto fail_set_cdev;

	fsg_common_set_inquiry_string(fsg_opts->common, config.vendor_name,
				      config.product_name);

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

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

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

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


	/* error recovery */
fail_string_ids:
	fsg_common_remove_luns(fsg_opts->common);
fail_set_cdev:
	fsg_common_free_luns(fsg_opts->common);
fail_set_nluns:
	fsg_common_free_buffers(fsg_opts->common);
fail2:
	usb_put_function_instance(fi_msg);
fail1:
	usb_put_function_instance(fi_acm);
fail0:
#ifdef USB_ETH_RNDIS
	usb_put_function_instance(fi_rndis);
fail:
#endif
#ifdef CONFIG_USB_G_MULTI_CDC
	usb_put_function_instance(fi_ecm);
#endif
	return status;
}

static int __exit multi_unbind(struct usb_composite_dev *cdev)
{
#ifdef CONFIG_USB_G_MULTI_CDC
	usb_put_function(f_msg_multi);
#endif
#ifdef USB_ETH_RNDIS
	usb_put_function(f_msg_rndis);
#endif
	usb_put_function_instance(fi_msg);
#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);
#ifdef USB_ETH_RNDIS
	usb_put_function(f_rndis);
	usb_put_function_instance(fi_rndis);
#endif
#ifdef CONFIG_USB_G_MULTI_CDC
	usb_put_function(f_ecm);
	usb_put_function_instance(fi_ecm);
#endif
	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