summaryrefslogtreecommitdiffstats
path: root/tools/usb/ffs-aio-example/multibuff/device_app/aio_multibuff.c
blob: 4b8279f373d532207dcc354685223ef0a3422416 (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
#define _BSD_SOURCE /* for endian.h */

#include <endian.h>
#include <errno.h>
#include <fcntl.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/poll.h>
#include <unistd.h>
#include <stdbool.h>
#include <sys/eventfd.h>

#include "libaio.h"
#define IOCB_FLAG_RESFD         (1 << 0)

#include <linux/usb/functionfs.h>

#define BUF_LEN		8192
#define BUFS_MAX	128
#define AIO_MAX		(BUFS_MAX*2)

/******************** Descriptors and Strings *******************************/

static const struct {
	struct usb_functionfs_descs_head_v2 header;
	__le32 fs_count;
	__le32 hs_count;
	struct {
		struct usb_interface_descriptor intf;
		struct usb_endpoint_descriptor_no_audio bulk_sink;
		struct usb_endpoint_descriptor_no_audio bulk_source;
	} __attribute__ ((__packed__)) fs_descs, hs_descs;
} __attribute__ ((__packed__)) descriptors = {
	.header = {
		.magic = htole32(FUNCTIONFS_DESCRIPTORS_MAGIC_V2),
		.flags = htole32(FUNCTIONFS_HAS_FS_DESC |
				     FUNCTIONFS_HAS_HS_DESC),
		.length = htole32(sizeof(descriptors)),
	},
	.fs_count = htole32(3),
	.fs_descs = {
		.intf = {
			.bLength = sizeof(descriptors.fs_descs.intf),
			.bDescriptorType = USB_DT_INTERFACE,
			.bNumEndpoints = 2,
			.bInterfaceClass = USB_CLASS_VENDOR_SPEC,
			.iInterface = 1,
		},
		.bulk_sink = {
			.bLength = sizeof(descriptors.fs_descs.bulk_sink),
			.bDescriptorType = USB_DT_ENDPOINT,
			.bEndpointAddress = 1 | USB_DIR_IN,
			.bmAttributes = USB_ENDPOINT_XFER_BULK,
		},
		.bulk_source = {
			.bLength = sizeof(descriptors.fs_descs.bulk_source),
			.bDescriptorType = USB_DT_ENDPOINT,
			.bEndpointAddress = 2 | USB_DIR_OUT,
			.bmAttributes = USB_ENDPOINT_XFER_BULK,
		},
	},
	.hs_count = htole32(3),
	.hs_descs = {
		.intf = {
			.bLength = sizeof(descriptors.hs_descs.intf),
			.bDescriptorType = USB_DT_INTERFACE,
			.bNumEndpoints = 2,
			.bInterfaceClass = USB_CLASS_VENDOR_SPEC,
			.iInterface = 1,
		},
		.bulk_sink = {
			.bLength = sizeof(descriptors.hs_descs.bulk_sink),
			.bDescriptorType = USB_DT_ENDPOINT,
			.bEndpointAddress = 1 | USB_DIR_IN,
			.bmAttributes = USB_ENDPOINT_XFER_BULK,
			.wMaxPacketSize = htole16(512),
		},
		.bulk_source = {
			.bLength = sizeof(descriptors.hs_descs.bulk_source),
			.bDescriptorType = USB_DT_ENDPOINT,
			.bEndpointAddress = 2 | USB_DIR_OUT,
			.bmAttributes = USB_ENDPOINT_XFER_BULK,
			.wMaxPacketSize = htole16(512),
		},
	},
};

#define STR_INTERFACE "AIO Test"

static const struct {
	struct usb_functionfs_strings_head header;
	struct {
		__le16 code;
		const char str1[sizeof(STR_INTERFACE)];
	} __attribute__ ((__packed__)) lang0;
} __attribute__ ((__packed__)) strings = {
	.header = {
		.magic = htole32(FUNCTIONFS_STRINGS_MAGIC),
		.length = htole32(sizeof(strings)),
		.str_count = htole32(1),
		.lang_count = htole32(1),
	},
	.lang0 = {
		htole16(0x0409), /* en-us */
		STR_INTERFACE,
	},
};

/********************** Buffer structure *******************************/

struct io_buffer {
	struct iocb **iocb;
	unsigned char **buf;
	unsigned cnt;
	unsigned len;
	unsigned requested;
};

/******************** Endpoints handling *******************************/

static void display_event(struct usb_functionfs_event *event)
{
	static const char *const names[] = {
		[FUNCTIONFS_BIND] = "BIND",
		[FUNCTIONFS_UNBIND] = "UNBIND",
		[FUNCTIONFS_ENABLE] = "ENABLE",
		[FUNCTIONFS_DISABLE] = "DISABLE",
		[FUNCTIONFS_SETUP] = "SETUP",
		[FUNCTIONFS_SUSPEND] = "SUSPEND",
		[FUNCTIONFS_RESUME] = "RESUME",
	};
	switch (event->type) {
	case FUNCTIONFS_BIND:
	case FUNCTIONFS_UNBIND:
	case FUNCTIONFS_ENABLE:
	case FUNCTIONFS_DISABLE:
	case FUNCTIONFS_SETUP:
	case FUNCTIONFS_SUSPEND:
	case FUNCTIONFS_RESUME:
		printf("Event %s\n", names[event->type]);
	}
}

static void handle_ep0(int ep0, bool *ready)
{
	int ret;
	struct usb_functionfs_event event;

	ret = read(ep0, &event, sizeof(event));
	if (!ret) {
		perror("unable to read event from ep0");
		return;
	}
	display_event(&event);
	switch (event.type) {
	case FUNCTIONFS_SETUP:
		if (event.u.setup.bRequestType & USB_DIR_IN)
			write(ep0, NULL, 0);
		else
			read(ep0, NULL, 0);
		break;

	case FUNCTIONFS_ENABLE:
		*ready = true;
		break;

	case FUNCTIONFS_DISABLE:
		*ready = false;
		break;

	default:
		break;
	}
}

void init_bufs(struct io_buffer *iobuf, unsigned n, unsigned len)
{
	unsigned i;
	iobuf->buf = malloc(n*sizeof(*iobuf->buf));
	iobuf->iocb = malloc(n*sizeof(*iobuf->iocb));
	iobuf->cnt = n;
	iobuf->len = len;
	iobuf->requested = 0;
	for (i = 0; i < n; ++i) {
		iobuf->buf[i] = malloc(len*sizeof(**iobuf->buf));
		iobuf->iocb[i] = malloc(sizeof(**iobuf->iocb));
	}
	iobuf->cnt = n;
}

void delete_bufs(struct io_buffer *iobuf)
{
	unsigned i;
	for (i = 0; i < iobuf->cnt; ++i) {
		free(iobuf->buf[i]);
		free(iobuf->iocb[i]);
	}
	free(iobuf->buf);
	free(iobuf->iocb);
}

int main(int argc, char *argv[])
{
	int ret;
	unsigned i, j;
	char *ep_path;

	int ep0, ep1;

	io_context_t ctx;

	int evfd;
	fd_set rfds;

	struct io_buffer iobuf[2];
	int actual = 0;
	bool ready;

	if (argc != 2) {
		printf("ffs directory not specified!\n");
		return 1;
	}

	ep_path = malloc(strlen(argv[1]) + 4 /* "/ep#" */ + 1 /* '\0' */);
	if (!ep_path) {
		perror("malloc");
		return 1;
	}

	/* open endpoint files */
	sprintf(ep_path, "%s/ep0", argv[1]);
	ep0 = open(ep_path, O_RDWR);
	if (ep0 < 0) {
		perror("unable to open ep0");
		return 1;
	}
	if (write(ep0, &descriptors, sizeof(descriptors)) < 0) {
		perror("unable do write descriptors");
		return 1;
	}
	if (write(ep0, &strings, sizeof(strings)) < 0) {
		perror("unable to write strings");
		return 1;
	}
	sprintf(ep_path, "%s/ep1", argv[1]);
	ep1 = open(ep_path, O_RDWR);
	if (ep1 < 0) {
		perror("unable to open ep1");
		return 1;
	}

	free(ep_path);

	memset(&ctx, 0, sizeof(ctx));
	/* setup aio context to handle up to AIO_MAX requests */
	if (io_setup(AIO_MAX, &ctx) < 0) {
		perror("unable to setup aio");
		return 1;
	}

	evfd = eventfd(0, 0);
	if (evfd < 0) {
		perror("unable to open eventfd");
		return 1;
	}

	for (i = 0; i < sizeof(iobuf)/sizeof(*iobuf); ++i)
		init_bufs(&iobuf[i], BUFS_MAX, BUF_LEN);

	while (1) {
		FD_ZERO(&rfds);
		FD_SET(ep0, &rfds);
		FD_SET(evfd, &rfds);

		ret = select(((ep0 > evfd) ? ep0 : evfd)+1,
			     &rfds, NULL, NULL, NULL);
		if (ret < 0) {
			if (errno == EINTR)
				continue;
			perror("select");
			break;
		}

		if (FD_ISSET(ep0, &rfds))
			handle_ep0(ep0, &ready);

		/* we are waiting for function ENABLE */
		if (!ready)
			continue;

		/*
		 * when we're preparing new data to submit,
		 * second buffer being transmitted
		 */
		for (i = 0; i < sizeof(iobuf)/sizeof(*iobuf); ++i) {
			if (iobuf[i].requested)
				continue;
			/* prepare requests */
			for (j = 0; j < iobuf[i].cnt; ++j) {
				io_prep_pwrite(iobuf[i].iocb[j], ep1,
					       iobuf[i].buf[j],
					       iobuf[i].len, 0);
				/* enable eventfd notification */
				iobuf[i].iocb[j]->u.c.flags |= IOCB_FLAG_RESFD;
				iobuf[i].iocb[j]->u.c.resfd = evfd;
			}
			/* submit table of requests */
			ret = io_submit(ctx, iobuf[i].cnt, iobuf[i].iocb);
			if (ret >= 0) {
				iobuf[i].requested = ret;
				printf("submit: %d requests buf: %d\n", ret, i);
			} else
				perror("unable to submit reqests");
		}

		/* if event is ready to read */
		if (!FD_ISSET(evfd, &rfds))
			continue;

		uint64_t ev_cnt;
		ret = read(evfd, &ev_cnt, sizeof(ev_cnt));
		if (ret < 0) {
			perror("unable to read eventfd");
			break;
		}

		struct io_event e[BUFS_MAX];
		/* we read aio events */
		ret = io_getevents(ctx, 1, BUFS_MAX, e, NULL);
		if (ret > 0) /* if we got events */
			iobuf[actual].requested -= ret;

		/* if all req's from iocb completed */
		if (!iobuf[actual].requested)
			actual = (actual + 1)%(sizeof(iobuf)/sizeof(*iobuf));
	}

	/* free resources */

	for (i = 0; i < sizeof(iobuf)/sizeof(*iobuf); ++i)
		delete_bufs(&iobuf[i]);
	io_destroy(ctx);

	close(ep1);
	close(ep0);

	return 0;
}