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1 | #include <stdio.h> |
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2 | #include <string.h> |
3 | #include <stdint.h> |
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4 | #include <sys/types.h> |
5 | #include <sys/stat.h> |
6 | #include <fcntl.h> |
7 | #include <sys/ioctl.h> |
8 | #include <sys/select.h> |
9 | #include <unistd.h> |
10 | #include <dirent.h> |
11 | #include <errno.h> |
12 | #include <linux/usbdevice_fs.h> |
13 | #include <linux/usb/ch9.h> |
14 | |
15 | #define ARRAY_SIZE(x) (sizeof(x) / sizeof(x[0])) |
16 | |
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17 | struct teensy_dev { |
18 | int fd; |
19 | struct { |
20 | int ep_in; |
21 | int ep_out; |
22 | } ifaces[2]; |
23 | }; |
24 | |
25 | /* return 1 if founf, 0 if not, < 0 on error */ |
26 | static int find_device(struct teensy_dev *dev, |
27 | uint16_t vendor, uint16_t product) |
28 | { |
29 | const char path_root[] = "/dev/bus/usb"; |
30 | union { |
31 | struct usb_descriptor_header hdr; |
32 | struct usb_device_descriptor d; |
33 | struct usb_config_descriptor c; |
34 | struct usb_interface_descriptor i; |
35 | struct usb_endpoint_descriptor e; |
36 | char space[0x100]; /* enough? */ |
37 | } desc; |
38 | char path_bus[256], path_dev[256]; |
39 | struct dirent *ent, *ent_bus; |
40 | DIR *dir = NULL, *dir_bus = NULL; |
41 | int num, fd = -1; |
42 | int iface = -1; |
43 | int retval = -1; |
44 | int ret; |
45 | |
46 | memset(dev, 0xff, sizeof(*dev)); |
47 | |
48 | dir = opendir(path_root); |
49 | if (dir == NULL) { |
50 | perror("opendir"); |
51 | return -1; |
52 | } |
53 | |
54 | for (ent = readdir(dir); ent != NULL; ent = readdir(dir)) { |
55 | /* should be a number like 000 */ |
56 | if (sscanf(ent->d_name, "%03d", &num) != 1) |
57 | continue; |
58 | |
59 | snprintf(path_bus, sizeof(path_bus), "%s/%s", |
60 | path_root, ent->d_name); |
61 | |
62 | dir_bus = opendir(path_bus); |
63 | if (dir_bus == NULL) |
64 | continue; |
65 | |
66 | ent_bus = readdir(dir_bus); |
67 | for (; ent_bus != NULL; ent_bus = readdir(dir_bus)) { |
68 | if (sscanf(ent->d_name, "%03d", &num) != 1) |
69 | continue; |
70 | |
71 | snprintf(path_dev, sizeof(path_dev), "%s/%s/%s", |
72 | path_root, ent->d_name, ent_bus->d_name); |
73 | |
74 | fd = open(path_dev, O_RDWR); |
75 | if (fd == -1) |
76 | continue; |
77 | |
78 | ret = read(fd, &desc.d, sizeof(desc.d)); |
79 | if (ret != sizeof(desc.d)) { |
80 | fprintf(stderr, "desc read: %d/%zd: ", ret, sizeof(desc.d)); |
81 | perror(""); |
82 | goto next; |
83 | } |
84 | |
85 | if (desc.d.bDescriptorType != USB_DT_DEVICE) { |
86 | fprintf(stderr, "%s: bad DT: 0x%02x\n", |
87 | path_dev, desc.d.bDescriptorType); |
88 | goto next; |
89 | } |
90 | |
91 | if (desc.d.idVendor == vendor && desc.d.idProduct == product) |
92 | goto found; |
93 | |
94 | next: |
95 | close(fd); |
96 | fd = -1; |
97 | } |
98 | |
99 | closedir(dir_bus); |
100 | dir_bus = NULL; |
101 | } |
102 | |
103 | /* not found */ |
104 | retval = 0; |
105 | goto out; |
106 | |
107 | found: |
108 | if (desc.d.bNumConfigurations != 1) { |
109 | fprintf(stderr, "unexpected bNumConfigurations: %u\n", |
110 | desc.d.bNumConfigurations); |
111 | goto out; |
112 | } |
113 | |
114 | /* walk through all descriptors */ |
115 | while (1) |
116 | { |
117 | ret = read(fd, &desc.hdr, sizeof(desc.hdr)); |
118 | if (ret == 0) |
119 | break; |
120 | if (ret != sizeof(desc.hdr)) { |
121 | fprintf(stderr, "desc.hdr read: %d/%zd: ", ret, sizeof(desc.hdr)); |
122 | perror(""); |
123 | break; |
124 | } |
125 | |
126 | ret = (int)lseek(fd, -sizeof(desc.hdr), SEEK_CUR); |
127 | if (ret == -1) { |
128 | perror("lseek"); |
129 | break; |
130 | } |
131 | |
132 | ret = read(fd, &desc, desc.hdr.bLength); |
133 | if (ret != desc.hdr.bLength) { |
134 | fprintf(stderr, "desc read: %d/%u: ", ret, desc.hdr.bLength); |
135 | perror(""); |
136 | break; |
137 | } |
138 | |
139 | switch (desc.hdr.bDescriptorType) { |
140 | case USB_DT_CONFIG: |
141 | if (desc.c.bNumInterfaces != 2) { |
142 | fprintf(stderr, "unexpected bNumInterfaces: %u\n", |
143 | desc.c.bNumInterfaces); |
144 | goto out; |
145 | } |
146 | break; |
147 | |
148 | case USB_DT_INTERFACE: |
149 | if (desc.i.bInterfaceClass != USB_CLASS_HID |
150 | || desc.i.bInterfaceSubClass != 0 |
151 | || desc.i.bInterfaceProtocol != 0) { |
152 | fprintf(stderr, "unexpected interface %x:%x:%x\n", |
153 | desc.i.bInterfaceClass, desc.i.bInterfaceSubClass, |
154 | desc.i.bInterfaceProtocol); |
155 | goto out; |
156 | } |
157 | if (desc.i.bNumEndpoints != 2) { |
158 | fprintf(stderr, "unexpected bNumEndpoints: %u\n", |
159 | desc.i.bNumEndpoints); |
160 | goto out; |
161 | } |
162 | iface++; |
163 | break; |
164 | |
165 | case USB_DT_ENDPOINT: |
166 | if (iface < 0 || iface >= ARRAY_SIZE(dev->ifaces)) { |
167 | fprintf(stderr, "bad iface: %d\n", iface); |
168 | goto out; |
169 | } |
170 | if (desc.e.wMaxPacketSize != 64 && desc.e.wMaxPacketSize != 32) { |
171 | fprintf(stderr, "iface %d, EP %02x: " |
172 | "unexpected wMaxPacketSize: %u\n", |
173 | iface, desc.e.bEndpointAddress, desc.e.wMaxPacketSize); |
174 | goto out; |
175 | } |
176 | if (desc.e.bEndpointAddress & 0x80) |
177 | dev->ifaces[iface].ep_in = desc.e.bEndpointAddress; // & 0x7F; |
178 | else |
179 | dev->ifaces[iface].ep_out = desc.e.bEndpointAddress; |
180 | break; |
181 | |
182 | case 0x21: |
183 | /* ignore */ |
184 | break; |
185 | |
186 | default: |
187 | fprintf(stderr, "skipping desc 0x%02x\n", |
188 | desc.hdr.bDescriptorType); |
189 | break; |
190 | } |
191 | } |
192 | |
193 | /* claim interfaces */ |
194 | for (iface = 0; iface < ARRAY_SIZE(dev->ifaces); iface++) { |
195 | struct usbdevfs_ioctl usbio; |
196 | |
197 | if (dev->ifaces[iface].ep_in == -1) { |
198 | fprintf(stderr, "missing ep_in, iface: %d\n", iface); |
199 | goto out; |
200 | } |
201 | if (dev->ifaces[iface].ep_out == -1) { |
202 | fprintf(stderr, "missing ep_out, iface: %d\n", iface); |
203 | goto out; |
204 | } |
205 | |
206 | /* disconnect default driver */ |
207 | memset(&usbio, 0, sizeof(usbio)); |
208 | usbio.ifno = iface; |
209 | usbio.ioctl_code = USBDEVFS_DISCONNECT; |
210 | ret = ioctl(fd, USBDEVFS_IOCTL, &usbio); |
211 | if (ret != 0 && errno != ENODATA) |
212 | perror("USBDEVFS_DISCONNECT"); |
213 | |
214 | ret = ioctl(fd, USBDEVFS_CLAIMINTERFACE, &iface); |
215 | if (ret != 0) |
216 | perror("USBDEVFS_CLAIMINTERFACE"); |
217 | } |
218 | |
219 | dev->fd = fd; |
220 | fd = -1; |
221 | retval = 1; |
222 | |
223 | out: |
224 | if (fd != -1) |
225 | close(fd); |
226 | if (dir_bus != NULL) |
227 | closedir(dir_bus); |
228 | if (dir != NULL) |
229 | closedir(dir); |
230 | |
231 | return retval; |
232 | } |
233 | |
234 | enum my_urbs { |
235 | URB_DATA_IN, |
236 | URB_DATA_OUT, |
237 | URB_DBG_IN, |
238 | URB_CNT |
239 | }; |
240 | |
241 | int main(int argc, char *argv[]) |
242 | { |
243 | struct teensy_dev dev; |
244 | struct usbdevfs_urb urb[URB_CNT]; |
245 | struct usbdevfs_urb *reaped_urb; |
246 | char buf_dbg[64 + 1], buf_in[64]; |
247 | int wait_device = 0; |
248 | int dbg_in_sent = 0; |
249 | int data_in_sent = 0; |
250 | fd_set wfds; |
251 | int ret; |
252 | |
253 | dev.fd = -1; |
254 | |
255 | while (1) |
256 | { |
257 | if (dev.fd == -1) { |
258 | ret = find_device(&dev, 0x16C0, 0x0486); |
259 | if (ret < 0) |
260 | return ret; |
261 | |
262 | if (ret == 0) { |
263 | if (!wait_device) { |
264 | printf("waiting for device..\n"); |
265 | wait_device = 1; |
266 | } |
267 | usleep(250000); |
268 | continue; |
269 | } |
270 | |
271 | wait_device = 0; |
272 | data_in_sent = 0; |
273 | dbg_in_sent = 0; |
274 | } |
275 | |
276 | if (!data_in_sent) { |
277 | memset(&urb[URB_DATA_IN], 0, sizeof(urb[URB_DATA_IN])); |
278 | urb[URB_DATA_IN].type = USBDEVFS_URB_TYPE_INTERRUPT; |
279 | urb[URB_DATA_IN].endpoint = dev.ifaces[0].ep_in; |
280 | urb[URB_DATA_IN].buffer = buf_in; |
281 | urb[URB_DATA_IN].buffer_length = sizeof(buf_in); |
282 | |
283 | ret = ioctl(dev.fd, USBDEVFS_SUBMITURB, &urb[URB_DATA_IN]); |
284 | if (ret != 0) { |
285 | perror("USBDEVFS_SUBMITURB URB_DATA_IN"); |
286 | return 1; |
287 | } |
288 | data_in_sent = 1; |
289 | } |
290 | if (!dbg_in_sent) { |
291 | memset(&urb[URB_DBG_IN], 0, sizeof(urb[URB_DBG_IN])); |
292 | urb[URB_DBG_IN].type = USBDEVFS_URB_TYPE_INTERRUPT; |
293 | urb[URB_DBG_IN].endpoint = dev.ifaces[1].ep_in; |
294 | urb[URB_DBG_IN].buffer = buf_dbg; |
295 | urb[URB_DBG_IN].buffer_length = sizeof(buf_dbg) - 1; |
296 | |
297 | ret = ioctl(dev.fd, USBDEVFS_SUBMITURB, &urb[URB_DBG_IN]); |
298 | if (ret != 0) { |
299 | perror("USBDEVFS_SUBMITURB URB_DBG_IN"); |
300 | return 1; |
301 | } |
302 | dbg_in_sent = 1; |
303 | } |
304 | |
305 | FD_ZERO(&wfds); |
306 | FD_SET(dev.fd, &wfds); |
307 | |
308 | ret = select(dev.fd + 1, NULL, &wfds, NULL, NULL); |
309 | if (ret < 0) { |
310 | perror("select"); |
311 | return 1; |
312 | } |
313 | |
314 | if (FD_ISSET(dev.fd, &wfds)) { |
315 | reaped_urb = NULL; |
316 | ret = ioctl(dev.fd, USBDEVFS_REAPURB, &reaped_urb); |
317 | if (ret != 0) { |
318 | if (errno == ENODEV) |
319 | goto dev_close; |
320 | perror("USBDEVFS_REAPURB"); |
321 | return 1; |
322 | } |
323 | |
324 | if (reaped_urb != NULL && reaped_urb->status != 0) { |
325 | errno = -reaped_urb->status; |
326 | perror("urb status"); |
327 | if (reaped_urb->status == -EILSEQ) { |
328 | /* this is usually a sign of disconnect.. */ |
329 | usleep(250000); |
330 | goto dev_close; |
331 | } |
332 | } |
333 | |
334 | if (reaped_urb == &urb[URB_DATA_IN]) { |
335 | printf("*data*\n"); |
336 | data_in_sent = 0; |
337 | } |
338 | else if (reaped_urb == &urb[URB_DBG_IN]) { |
339 | /* debug text */ |
340 | buf_dbg[reaped_urb->actual_length] = 0; |
341 | printf("%s", buf_dbg); |
342 | dbg_in_sent = 0; |
343 | } |
344 | else { |
345 | fprintf(stderr, "reaped unknown urb? %p\n", reaped_urb); |
346 | } |
347 | } |
348 | continue; |
349 | |
350 | dev_close: |
351 | close(dev.fd); |
352 | dev.fd = -1; |
353 | } |
354 | |
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355 | return 0; |
356 | } |
357 | |
358 | // vim: ts=2:sw=2:expandtab |