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1 | /* HM-CFG-USB libusb-driver | |
2 | * | |
3 | * Copyright (c) 2013 Michael Gernoth <michael@gernoth.net> | |
4 | * | |
5 | * Permission is hereby granted, free of charge, to any person obtaining a copy | |
6 | * of this software and associated documentation files (the "Software"), to | |
7 | * deal in the Software without restriction, including without limitation the | |
8 | * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or | |
9 | * sell copies of the Software, and to permit persons to whom the Software is | |
10 | * furnished to do so, subject to the following conditions: | |
11 | * | |
12 | * The above copyright notice and this permission notice shall be included in | |
13 | * all copies or substantial portions of the Software. | |
14 | * | |
15 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
16 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
17 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | |
18 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
19 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING | |
20 | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS | |
21 | * IN THE SOFTWARE. | |
22 | */ | |
23 | ||
24 | #include <string.h> | |
25 | #include <stdio.h> | |
26 | #include <stdint.h> | |
27 | #include <unistd.h> | |
28 | #include <stdlib.h> | |
29 | #include <math.h> | |
30 | #include <poll.h> | |
31 | #include <errno.h> | |
32 | #include <libusb-1.0/libusb.h> | |
33 | ||
34 | #include "hexdump.h" | |
35 | #include "hmcfgusb.h" | |
36 | ||
37 | #define USB_TIMEOUT 10000 | |
38 | ||
39 | #define ID_VENDOR 0x1b1f | |
40 | #define ID_PRODUCT 0xc00f | |
41 | ||
42 | /* TODO: dynamic */ | |
43 | #define ASYNC_SIZE 0x0040 | |
44 | #define ASYNC_INTERVAL 32 | |
45 | ||
46 | #define EP_OUT 0x02 | |
47 | #define EP_IN 0x83 | |
48 | ||
49 | static int quit = 0; | |
50 | ||
51 | /* Not in all libusb-1.0 versions, so we have to roll our own :-( */ | |
52 | static char * usb_strerror(int e) | |
53 | { | |
54 | static char unknerr[256]; | |
55 | ||
56 | switch (e) { | |
57 | case LIBUSB_SUCCESS: | |
58 | return "Success"; | |
59 | case LIBUSB_ERROR_IO: | |
60 | return "Input/output error"; | |
61 | case LIBUSB_ERROR_INVALID_PARAM: | |
62 | return "Invalid parameter"; | |
63 | case LIBUSB_ERROR_ACCESS: | |
64 | return "Access denied (insufficient permissions)"; | |
65 | case LIBUSB_ERROR_NO_DEVICE: | |
66 | return "No such device (it may have been disconnected)"; | |
67 | case LIBUSB_ERROR_NOT_FOUND: | |
68 | return "Entity not found"; | |
69 | case LIBUSB_ERROR_BUSY: | |
70 | return "Resource busy"; | |
71 | case LIBUSB_ERROR_TIMEOUT: | |
72 | return "Operation timed out"; | |
73 | case LIBUSB_ERROR_OVERFLOW: | |
74 | return "Overflow"; | |
75 | case LIBUSB_ERROR_PIPE: | |
76 | return "Pipe error"; | |
77 | case LIBUSB_ERROR_INTERRUPTED: | |
78 | return "System call interrupted (perhaps due to signal)"; | |
79 | case LIBUSB_ERROR_NO_MEM: | |
80 | return "Insufficient memory"; | |
81 | case LIBUSB_ERROR_NOT_SUPPORTED: | |
82 | return "Operation not supported or unimplemented on this platform"; | |
83 | case LIBUSB_ERROR_OTHER: | |
84 | return "Other error"; | |
85 | }; | |
86 | snprintf(unknerr, sizeof(unknerr), "Unknown error code %d / 0x%02x", e, e); | |
87 | return unknerr; | |
88 | } | |
89 | ||
90 | static libusb_device_handle *hmcfgusb_find() { | |
91 | libusb_device_handle *devh = NULL; | |
92 | libusb_device **list; | |
93 | ssize_t cnt; | |
94 | ssize_t i; | |
95 | int err; | |
96 | ||
97 | cnt = libusb_get_device_list(NULL, &list); | |
98 | if (cnt < 0) { | |
99 | fprintf(stderr, "Can't get USB device list: %d\n", (int)cnt); | |
100 | return NULL; | |
101 | } | |
102 | ||
103 | for (i = 0; i < cnt; i++){ | |
104 | struct libusb_device_descriptor desc; | |
105 | ||
106 | err = libusb_get_device_descriptor(list[i], &desc); | |
107 | if (err) | |
108 | continue; | |
109 | ||
110 | if ((desc.idVendor == ID_VENDOR) && (desc.idProduct == ID_PRODUCT)) { | |
111 | libusb_device *dev = list[i]; | |
112 | ||
113 | err = libusb_open(dev, &devh); | |
114 | if (err) { | |
115 | fprintf(stderr, "Can't open device: %s\n", usb_strerror(err)); | |
116 | return NULL; | |
117 | } | |
118 | ||
119 | err = libusb_detach_kernel_driver(devh, 0); | |
120 | if ((err != 0) && (err != LIBUSB_ERROR_NOT_FOUND)) { | |
121 | fprintf(stderr, "Can't detach kernel driver: %s\n", usb_strerror(err)); | |
122 | return NULL; | |
123 | } | |
124 | ||
125 | err = libusb_claim_interface(devh, 0); | |
126 | if ((err != 0)) { | |
127 | fprintf(stderr, "Can't claim interface: %s\n", usb_strerror(err)); | |
128 | return NULL; | |
129 | } | |
130 | ||
131 | return devh; | |
132 | } | |
133 | ||
134 | } | |
135 | ||
136 | return NULL; | |
137 | } | |
138 | ||
139 | int hmcfgusb_send(struct hmcfgusb_dev *usbdev, unsigned char* send_data, int len, int done) | |
140 | { | |
141 | int err; | |
142 | int cnt; | |
143 | int ret; | |
144 | ||
145 | err = libusb_interrupt_transfer(usbdev->usb_devh, EP_OUT, send_data, len, &cnt, USB_TIMEOUT); | |
146 | if (err) { | |
147 | fprintf(stderr, "Can't send data: %s\n", usb_strerror(err)); | |
148 | if (err == LIBUSB_ERROR_NO_DEVICE) | |
149 | exit(EXIT_FAILURE); | |
150 | return 0; | |
151 | } | |
152 | ||
153 | if (done) { | |
154 | err = libusb_interrupt_transfer(usbdev->usb_devh, EP_OUT, send_data, 0, &cnt, USB_TIMEOUT); | |
155 | if (err) { | |
156 | fprintf(stderr, "Can't send data: %s\n", usb_strerror(err)); | |
157 | if (err == LIBUSB_ERROR_NO_DEVICE) | |
158 | exit(EXIT_FAILURE); | |
159 | return 0; | |
160 | } | |
161 | } | |
162 | ||
163 | return ret; | |
164 | } | |
165 | ||
166 | static struct libusb_transfer *hmcfgusb_prepare_int(libusb_device_handle *devh, libusb_transfer_cb_fn cb, void *data) | |
167 | { | |
168 | unsigned char *data_buf; | |
169 | struct libusb_transfer *transfer; | |
170 | int err; | |
171 | ||
172 | data_buf = malloc(ASYNC_SIZE); | |
173 | if (!data_buf) { | |
174 | fprintf(stderr, "Can't allocate memory for data-buffer!\n"); | |
175 | return NULL; | |
176 | } | |
177 | ||
178 | transfer = libusb_alloc_transfer(0); | |
179 | if (!transfer) { | |
180 | fprintf(stderr, "Can't allocate memory for usb-transfer!\n"); | |
181 | free(data_buf); | |
182 | return NULL; | |
183 | } | |
184 | ||
185 | libusb_fill_interrupt_transfer(transfer, devh, EP_IN, | |
186 | data_buf, ASYNC_SIZE, cb, data, USB_TIMEOUT); | |
187 | ||
188 | transfer->flags = LIBUSB_TRANSFER_SHORT_NOT_OK; | |
189 | ||
190 | err = libusb_submit_transfer(transfer); | |
191 | if (err != 0) { | |
192 | fprintf(stderr, "Can't submit transfer: %s\n", usb_strerror(err)); | |
193 | libusb_free_transfer(transfer); | |
194 | free(data_buf); | |
195 | return NULL; | |
196 | } | |
197 | ||
198 | return transfer; | |
199 | } | |
200 | ||
201 | struct hmcfgusb_cb_data { | |
202 | hmcfgusb_cb_fn cb; | |
203 | void *data; | |
204 | }; | |
205 | ||
206 | static void LIBUSB_CALL hmcfgusb_interrupt(struct libusb_transfer *transfer) | |
207 | { | |
208 | int err; | |
209 | struct hmcfgusb_cb_data *cb_data; | |
210 | ||
211 | if (transfer->status != LIBUSB_TRANSFER_COMPLETED) { | |
212 | if (transfer->status != LIBUSB_TRANSFER_TIMED_OUT) { | |
213 | fprintf(stderr, "Interrupt transfer not completed: %d!\n", transfer->status); | |
214 | quit = EIO; | |
215 | return; | |
216 | } | |
217 | ||
218 | err = libusb_submit_transfer(transfer); | |
219 | if (err != 0) { | |
220 | fprintf(stderr, "Can't re-submit transfer: %s\n", usb_strerror(err)); | |
221 | free(transfer->buffer); | |
222 | libusb_free_transfer(transfer); | |
223 | } | |
224 | return; | |
225 | } | |
226 | ||
227 | cb_data = transfer->user_data; | |
228 | if (cb_data && cb_data->cb) { | |
229 | cb_data->cb(transfer->buffer, transfer->actual_length, cb_data->data); | |
230 | } else { | |
231 | hexdump(transfer->buffer, transfer->actual_length, "RECV> "); | |
232 | } | |
233 | ||
234 | err = libusb_submit_transfer(transfer); | |
235 | if (err != 0) { | |
236 | fprintf(stderr, "Can't re-submit transfer: %s\n", usb_strerror(err)); | |
237 | free(transfer->buffer); | |
238 | libusb_free_transfer(transfer); | |
239 | } | |
240 | } | |
241 | ||
242 | struct hmcfgusb_dev *hmcfgusb_init(hmcfgusb_cb_fn cb, void *data) | |
243 | { | |
244 | libusb_device_handle *devh = NULL; | |
245 | const struct libusb_pollfd **usb_pfd = NULL; | |
246 | struct hmcfgusb_dev *dev = NULL; | |
247 | struct hmcfgusb_cb_data *cb_data = NULL; | |
248 | int err; | |
249 | int i; | |
250 | ||
251 | err = libusb_init(NULL); | |
252 | if (err != 0) { | |
253 | fprintf(stderr, "Can't initialize libusb: %s\n", usb_strerror(err)); | |
254 | return NULL; | |
255 | } | |
256 | ||
257 | devh = hmcfgusb_find(); | |
258 | if (!devh) { | |
259 | fprintf(stderr, "Can't find/open hmcfgusb!\n"); | |
260 | return NULL; | |
261 | } | |
262 | ||
263 | dev = malloc(sizeof(struct hmcfgusb_dev)); | |
264 | if (!dev) { | |
265 | perror("Can't allocate memory for hmcfgusb_dev"); | |
266 | return NULL; | |
267 | } | |
268 | ||
269 | memset(dev, 0, sizeof(struct hmcfgusb_dev)); | |
270 | dev->usb_devh = devh; | |
271 | ||
272 | cb_data = malloc(sizeof(struct hmcfgusb_cb_data)); | |
273 | if (!cb_data) { | |
274 | perror("Can't allocate memory for hmcfgusb_cb_data"); | |
275 | return NULL; | |
276 | } | |
277 | ||
278 | memset(cb_data, 0, sizeof(struct hmcfgusb_cb_data)); | |
279 | ||
280 | cb_data->cb = cb; | |
281 | cb_data->data = data; | |
282 | ||
283 | dev->transfer = hmcfgusb_prepare_int(devh, hmcfgusb_interrupt, cb_data); | |
284 | if (!dev->transfer) { | |
285 | fprintf(stderr, "Can't prepare async device io!\n"); | |
286 | return NULL; | |
287 | } | |
288 | ||
289 | usb_pfd = libusb_get_pollfds(NULL); | |
290 | if (!usb_pfd) { | |
291 | fprintf(stderr, "Can't get FDset from libusb!\n"); | |
292 | free(dev); | |
293 | return NULL; | |
294 | } | |
295 | ||
296 | dev->n_usb_pfd = 0; | |
297 | for(i = 0; usb_pfd[i]; i++) | |
298 | dev->n_usb_pfd++; | |
299 | ||
300 | dev->pfd = malloc(dev->n_usb_pfd * sizeof(struct pollfd)); | |
301 | if (!dev->pfd) { | |
302 | perror("Can't allocate memory for poll-fds"); | |
303 | return NULL; | |
304 | } | |
305 | ||
306 | memset(dev->pfd, 0, dev->n_usb_pfd * sizeof(struct pollfd)); | |
307 | ||
308 | for (i = 0; i < dev->n_usb_pfd; i++) { | |
309 | dev->pfd[i].fd = usb_pfd[i]->fd; | |
310 | dev->pfd[i].events = usb_pfd[i]->events; | |
311 | dev->pfd[i].revents = 0; | |
312 | } | |
313 | ||
314 | free(usb_pfd); | |
315 | ||
316 | dev->n_pfd = dev->n_usb_pfd; | |
317 | ||
318 | return dev; | |
319 | } | |
320 | ||
321 | int hmcfgusb_add_pfd(struct hmcfgusb_dev *dev, int fd, short events) | |
322 | { | |
323 | dev->n_pfd++; | |
324 | dev->pfd = realloc(dev->pfd, dev->n_pfd * sizeof(struct pollfd)); | |
325 | if (!dev->pfd) { | |
326 | perror("Can't realloc poll-fds"); | |
327 | return 0; | |
328 | } | |
329 | ||
330 | dev->pfd[dev->n_pfd-1].fd = fd; | |
331 | dev->pfd[dev->n_pfd-1].events = events; | |
332 | dev->pfd[dev->n_pfd-1].revents = 0; | |
333 | ||
334 | return 1; | |
335 | } | |
336 | ||
337 | int hmcfgusb_poll(struct hmcfgusb_dev *dev, int timeout) | |
338 | { | |
339 | struct timeval tv; | |
340 | int usb_event = 0; | |
341 | int i; | |
342 | int n; | |
343 | int fd_n; | |
344 | int err; | |
345 | ||
346 | errno = 0; | |
347 | ||
348 | memset(&tv, 0, sizeof(tv)); | |
349 | err = libusb_get_next_timeout(NULL, &tv); | |
350 | if (err < 0) { | |
351 | fprintf(stderr, "libusb_get_next_timeout: %s\n", usb_strerror(err)); | |
352 | errno = EIO; | |
353 | return -1; | |
354 | } else if (err == 0) { | |
355 | /* No pending timeout or a sane platform */ | |
356 | tv.tv_sec = timeout; | |
357 | } else { | |
358 | if ((tv.tv_sec == 0) && (tv.tv_usec == 0)) { | |
359 | usb_event = 1; | |
360 | } | |
361 | } | |
362 | ||
363 | if (!usb_event) { | |
364 | for (i = 0; i < dev->n_pfd; i++) { | |
365 | dev->pfd[i].revents = 0; | |
366 | } | |
367 | ||
368 | n = poll(dev->pfd, dev->n_pfd, tv.tv_sec * 1000); | |
369 | if (n < 0) { | |
370 | perror("poll"); | |
371 | return -1; | |
372 | } else if (n == 0) { | |
373 | usb_event = 1; | |
374 | } else { | |
375 | for (fd_n = 0; fd_n < dev->n_pfd; fd_n++) { | |
376 | if (dev->pfd[fd_n].revents) { | |
377 | if (fd_n < dev->n_usb_pfd) { | |
378 | usb_event = 1; | |
379 | break; | |
380 | } else { | |
381 | return dev->pfd[fd_n].fd; | |
382 | } | |
383 | } | |
384 | } | |
385 | } | |
386 | } | |
387 | ||
388 | if (usb_event) { | |
389 | memset(&tv, 0, sizeof(tv)); | |
390 | err = libusb_handle_events_timeout_completed(NULL, &tv, NULL); | |
391 | if (err < 0) { | |
392 | fprintf(stderr, "libusb_handle_events_completed: %s\n", usb_strerror(err)); | |
393 | errno = EIO; | |
394 | return -1; | |
395 | } | |
396 | } | |
397 | ||
398 | if (quit) | |
399 | errno = quit; | |
400 | ||
401 | return -1; | |
402 | } |