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1 | /* | |
2 | * dbgp.c -- EHCI Debug Port device gadget | |
3 | * | |
4 | * Copyright (C) 2010 Stephane Duverger | |
5 | * | |
6 | * Released under the GPLv2. | |
7 | */ | |
8 | ||
9 | /* verbose messages */ | |
10 | #include <linux/kernel.h> | |
11 | #include <linux/device.h> | |
12 | #include <linux/module.h> | |
13 | #include <linux/usb/ch9.h> | |
14 | #include <linux/usb/gadget.h> | |
15 | ||
16 | /* See comments in "zero.c" */ | |
17 | #include "epautoconf.c" | |
18 | ||
19 | #ifdef CONFIG_USB_G_DBGP_SERIAL | |
20 | #include "u_serial.c" | |
21 | #endif | |
22 | ||
23 | #define DRIVER_VENDOR_ID 0x0525 /* NetChip */ | |
24 | #define DRIVER_PRODUCT_ID 0xc0de /* undefined */ | |
25 | ||
26 | #define USB_DEBUG_MAX_PACKET_SIZE 8 | |
27 | #define DBGP_REQ_EP0_LEN 128 | |
28 | #define DBGP_REQ_LEN 512 | |
29 | ||
30 | static struct dbgp { | |
31 | struct usb_gadget *gadget; | |
32 | struct usb_request *req; | |
33 | struct usb_ep *i_ep; | |
34 | struct usb_ep *o_ep; | |
35 | #ifdef CONFIG_USB_G_DBGP_SERIAL | |
36 | struct gserial *serial; | |
37 | #endif | |
38 | } dbgp; | |
39 | ||
40 | static struct usb_device_descriptor device_desc = { | |
41 | .bLength = sizeof device_desc, | |
42 | .bDescriptorType = USB_DT_DEVICE, | |
43 | .bcdUSB = __constant_cpu_to_le16(0x0200), | |
44 | .bDeviceClass = USB_CLASS_VENDOR_SPEC, | |
45 | .idVendor = __constant_cpu_to_le16(DRIVER_VENDOR_ID), | |
46 | .idProduct = __constant_cpu_to_le16(DRIVER_PRODUCT_ID), | |
47 | .bNumConfigurations = 1, | |
48 | }; | |
49 | ||
50 | static struct usb_debug_descriptor dbg_desc = { | |
51 | .bLength = sizeof dbg_desc, | |
52 | .bDescriptorType = USB_DT_DEBUG, | |
53 | }; | |
54 | ||
55 | static struct usb_endpoint_descriptor i_desc = { | |
56 | .bLength = USB_DT_ENDPOINT_SIZE, | |
57 | .bDescriptorType = USB_DT_ENDPOINT, | |
58 | .bmAttributes = USB_ENDPOINT_XFER_BULK, | |
59 | .bEndpointAddress = USB_DIR_IN, | |
60 | }; | |
61 | ||
62 | static struct usb_endpoint_descriptor o_desc = { | |
63 | .bLength = USB_DT_ENDPOINT_SIZE, | |
64 | .bDescriptorType = USB_DT_ENDPOINT, | |
65 | .bmAttributes = USB_ENDPOINT_XFER_BULK, | |
66 | .bEndpointAddress = USB_DIR_OUT, | |
67 | }; | |
68 | ||
69 | #ifdef CONFIG_USB_G_DBGP_PRINTK | |
70 | static int dbgp_consume(char *buf, unsigned len) | |
71 | { | |
72 | char c; | |
73 | ||
74 | if (!len) | |
75 | return 0; | |
76 | ||
77 | c = buf[len-1]; | |
78 | if (c != 0) | |
79 | buf[len-1] = 0; | |
80 | ||
81 | printk(KERN_NOTICE "%s%c", buf, c); | |
82 | return 0; | |
83 | } | |
84 | ||
85 | static void __disable_ep(struct usb_ep *ep) | |
86 | { | |
87 | if (ep && ep->driver_data == dbgp.gadget) { | |
88 | usb_ep_disable(ep); | |
89 | ep->driver_data = NULL; | |
90 | } | |
91 | } | |
92 | ||
93 | static void dbgp_disable_ep(void) | |
94 | { | |
95 | __disable_ep(dbgp.i_ep); | |
96 | __disable_ep(dbgp.o_ep); | |
97 | } | |
98 | ||
99 | static void dbgp_complete(struct usb_ep *ep, struct usb_request *req) | |
100 | { | |
101 | int stp; | |
102 | int err = 0; | |
103 | int status = req->status; | |
104 | ||
105 | if (ep == dbgp.i_ep) { | |
106 | stp = 1; | |
107 | goto fail; | |
108 | } | |
109 | ||
110 | if (status != 0) { | |
111 | stp = 2; | |
112 | goto release_req; | |
113 | } | |
114 | ||
115 | dbgp_consume(req->buf, req->actual); | |
116 | ||
117 | req->length = DBGP_REQ_LEN; | |
118 | err = usb_ep_queue(ep, req, GFP_ATOMIC); | |
119 | if (err < 0) { | |
120 | stp = 3; | |
121 | goto release_req; | |
122 | } | |
123 | ||
124 | return; | |
125 | ||
126 | release_req: | |
127 | kfree(req->buf); | |
128 | usb_ep_free_request(dbgp.o_ep, req); | |
129 | dbgp_disable_ep(); | |
130 | fail: | |
131 | dev_dbg(&dbgp.gadget->dev, | |
132 | "complete: failure (%d:%d) ==> %d\n", stp, err, status); | |
133 | } | |
134 | ||
135 | static int dbgp_enable_ep_req(struct usb_ep *ep) | |
136 | { | |
137 | int err, stp; | |
138 | struct usb_request *req; | |
139 | ||
140 | req = usb_ep_alloc_request(ep, GFP_KERNEL); | |
141 | if (!req) { | |
142 | err = -ENOMEM; | |
143 | stp = 1; | |
144 | goto fail_1; | |
145 | } | |
146 | ||
147 | req->buf = kmalloc(DBGP_REQ_LEN, GFP_KERNEL); | |
148 | if (!req->buf) { | |
149 | err = -ENOMEM; | |
150 | stp = 2; | |
151 | goto fail_2; | |
152 | } | |
153 | ||
154 | req->complete = dbgp_complete; | |
155 | req->length = DBGP_REQ_LEN; | |
156 | err = usb_ep_queue(ep, req, GFP_ATOMIC); | |
157 | if (err < 0) { | |
158 | stp = 3; | |
159 | goto fail_3; | |
160 | } | |
161 | ||
162 | return 0; | |
163 | ||
164 | fail_3: | |
165 | kfree(req->buf); | |
166 | fail_2: | |
167 | usb_ep_free_request(dbgp.o_ep, req); | |
168 | fail_1: | |
169 | dev_dbg(&dbgp.gadget->dev, | |
170 | "enable ep req: failure (%d:%d)\n", stp, err); | |
171 | return err; | |
172 | } | |
173 | ||
174 | static int __enable_ep(struct usb_ep *ep, struct usb_endpoint_descriptor *desc) | |
175 | { | |
176 | int err; | |
177 | ep->desc = desc; | |
178 | err = usb_ep_enable(ep); | |
179 | ep->driver_data = dbgp.gadget; | |
180 | return err; | |
181 | } | |
182 | ||
183 | static int dbgp_enable_ep(void) | |
184 | { | |
185 | int err, stp; | |
186 | ||
187 | err = __enable_ep(dbgp.i_ep, &i_desc); | |
188 | if (err < 0) { | |
189 | stp = 1; | |
190 | goto fail_1; | |
191 | } | |
192 | ||
193 | err = __enable_ep(dbgp.o_ep, &o_desc); | |
194 | if (err < 0) { | |
195 | stp = 2; | |
196 | goto fail_2; | |
197 | } | |
198 | ||
199 | err = dbgp_enable_ep_req(dbgp.o_ep); | |
200 | if (err < 0) { | |
201 | stp = 3; | |
202 | goto fail_3; | |
203 | } | |
204 | ||
205 | return 0; | |
206 | ||
207 | fail_3: | |
208 | __disable_ep(dbgp.o_ep); | |
209 | fail_2: | |
210 | __disable_ep(dbgp.i_ep); | |
211 | fail_1: | |
212 | dev_dbg(&dbgp.gadget->dev, "enable ep: failure (%d:%d)\n", stp, err); | |
213 | return err; | |
214 | } | |
215 | #endif | |
216 | ||
217 | static void dbgp_disconnect(struct usb_gadget *gadget) | |
218 | { | |
219 | #ifdef CONFIG_USB_G_DBGP_PRINTK | |
220 | dbgp_disable_ep(); | |
221 | #else | |
222 | gserial_disconnect(dbgp.serial); | |
223 | #endif | |
224 | } | |
225 | ||
226 | static void dbgp_unbind(struct usb_gadget *gadget) | |
227 | { | |
228 | #ifdef CONFIG_USB_G_DBGP_SERIAL | |
229 | kfree(dbgp.serial); | |
230 | #endif | |
231 | if (dbgp.req) { | |
232 | kfree(dbgp.req->buf); | |
233 | usb_ep_free_request(gadget->ep0, dbgp.req); | |
234 | } | |
235 | ||
236 | gadget->ep0->driver_data = NULL; | |
237 | } | |
238 | ||
239 | static int __init dbgp_configure_endpoints(struct usb_gadget *gadget) | |
240 | { | |
241 | int stp; | |
242 | ||
243 | usb_ep_autoconfig_reset(gadget); | |
244 | ||
245 | dbgp.i_ep = usb_ep_autoconfig(gadget, &i_desc); | |
246 | if (!dbgp.i_ep) { | |
247 | stp = 1; | |
248 | goto fail_1; | |
249 | } | |
250 | ||
251 | dbgp.i_ep->driver_data = gadget; | |
252 | i_desc.wMaxPacketSize = | |
253 | __constant_cpu_to_le16(USB_DEBUG_MAX_PACKET_SIZE); | |
254 | ||
255 | dbgp.o_ep = usb_ep_autoconfig(gadget, &o_desc); | |
256 | if (!dbgp.o_ep) { | |
257 | dbgp.i_ep->driver_data = NULL; | |
258 | stp = 2; | |
259 | goto fail_2; | |
260 | } | |
261 | ||
262 | dbgp.o_ep->driver_data = gadget; | |
263 | o_desc.wMaxPacketSize = | |
264 | __constant_cpu_to_le16(USB_DEBUG_MAX_PACKET_SIZE); | |
265 | ||
266 | dbg_desc.bDebugInEndpoint = i_desc.bEndpointAddress; | |
267 | dbg_desc.bDebugOutEndpoint = o_desc.bEndpointAddress; | |
268 | ||
269 | #ifdef CONFIG_USB_G_DBGP_SERIAL | |
270 | dbgp.serial->in = dbgp.i_ep; | |
271 | dbgp.serial->out = dbgp.o_ep; | |
272 | ||
273 | dbgp.serial->in->desc = &i_desc; | |
274 | dbgp.serial->out->desc = &o_desc; | |
275 | ||
276 | if (gserial_setup(gadget, 1) < 0) { | |
277 | stp = 3; | |
278 | goto fail_3; | |
279 | } | |
280 | ||
281 | return 0; | |
282 | ||
283 | fail_3: | |
284 | dbgp.o_ep->driver_data = NULL; | |
285 | #else | |
286 | return 0; | |
287 | #endif | |
288 | fail_2: | |
289 | dbgp.i_ep->driver_data = NULL; | |
290 | fail_1: | |
291 | dev_dbg(&dbgp.gadget->dev, "ep config: failure (%d)\n", stp); | |
292 | return -ENODEV; | |
293 | } | |
294 | ||
295 | static int __init dbgp_bind(struct usb_gadget *gadget) | |
296 | { | |
297 | int err, stp; | |
298 | ||
299 | dbgp.gadget = gadget; | |
300 | ||
301 | dbgp.req = usb_ep_alloc_request(gadget->ep0, GFP_KERNEL); | |
302 | if (!dbgp.req) { | |
303 | err = -ENOMEM; | |
304 | stp = 1; | |
305 | goto fail; | |
306 | } | |
307 | ||
308 | dbgp.req->buf = kmalloc(DBGP_REQ_EP0_LEN, GFP_KERNEL); | |
309 | if (!dbgp.req->buf) { | |
310 | err = -ENOMEM; | |
311 | stp = 2; | |
312 | goto fail; | |
313 | } | |
314 | ||
315 | dbgp.req->length = DBGP_REQ_EP0_LEN; | |
316 | gadget->ep0->driver_data = gadget; | |
317 | ||
318 | #ifdef CONFIG_USB_G_DBGP_SERIAL | |
319 | dbgp.serial = kzalloc(sizeof(struct gserial), GFP_KERNEL); | |
320 | if (!dbgp.serial) { | |
321 | stp = 3; | |
322 | err = -ENOMEM; | |
323 | goto fail; | |
324 | } | |
325 | #endif | |
326 | err = dbgp_configure_endpoints(gadget); | |
327 | if (err < 0) { | |
328 | stp = 4; | |
329 | goto fail; | |
330 | } | |
331 | ||
332 | dev_dbg(&dbgp.gadget->dev, "bind: success\n"); | |
333 | return 0; | |
334 | ||
335 | fail: | |
336 | dev_dbg(&gadget->dev, "bind: failure (%d:%d)\n", stp, err); | |
337 | dbgp_unbind(gadget); | |
338 | return err; | |
339 | } | |
340 | ||
341 | static void dbgp_setup_complete(struct usb_ep *ep, | |
342 | struct usb_request *req) | |
343 | { | |
344 | dev_dbg(&dbgp.gadget->dev, "setup complete: %d, %d/%d\n", | |
345 | req->status, req->actual, req->length); | |
346 | } | |
347 | ||
348 | static int dbgp_setup(struct usb_gadget *gadget, | |
349 | const struct usb_ctrlrequest *ctrl) | |
350 | { | |
351 | struct usb_request *req = dbgp.req; | |
352 | u8 request = ctrl->bRequest; | |
353 | u16 value = le16_to_cpu(ctrl->wValue); | |
354 | u16 length = le16_to_cpu(ctrl->wLength); | |
355 | int err = -EOPNOTSUPP; | |
356 | void *data = NULL; | |
357 | u16 len = 0; | |
358 | ||
359 | gadget->ep0->driver_data = gadget; | |
360 | ||
361 | if (request == USB_REQ_GET_DESCRIPTOR) { | |
362 | switch (value>>8) { | |
363 | case USB_DT_DEVICE: | |
364 | dev_dbg(&dbgp.gadget->dev, "setup: desc device\n"); | |
365 | len = sizeof device_desc; | |
366 | data = &device_desc; | |
367 | device_desc.bMaxPacketSize0 = gadget->ep0->maxpacket; | |
368 | break; | |
369 | case USB_DT_DEBUG: | |
370 | dev_dbg(&dbgp.gadget->dev, "setup: desc debug\n"); | |
371 | len = sizeof dbg_desc; | |
372 | data = &dbg_desc; | |
373 | break; | |
374 | default: | |
375 | goto fail; | |
376 | } | |
377 | err = 0; | |
378 | } else if (request == USB_REQ_SET_FEATURE && | |
379 | value == USB_DEVICE_DEBUG_MODE) { | |
380 | dev_dbg(&dbgp.gadget->dev, "setup: feat debug\n"); | |
381 | #ifdef CONFIG_USB_G_DBGP_PRINTK | |
382 | err = dbgp_enable_ep(); | |
383 | #else | |
384 | err = gserial_connect(dbgp.serial, 0); | |
385 | #endif | |
386 | if (err < 0) | |
387 | goto fail; | |
388 | } else | |
389 | goto fail; | |
390 | ||
391 | req->length = min(length, len); | |
392 | req->zero = len < req->length; | |
393 | if (data && req->length) | |
394 | memcpy(req->buf, data, req->length); | |
395 | ||
396 | req->complete = dbgp_setup_complete; | |
397 | return usb_ep_queue(gadget->ep0, req, GFP_ATOMIC); | |
398 | ||
399 | fail: | |
400 | dev_dbg(&dbgp.gadget->dev, | |
401 | "setup: failure req %x v %x\n", request, value); | |
402 | return err; | |
403 | } | |
404 | ||
405 | static struct usb_gadget_driver dbgp_driver = { | |
406 | .function = "dbgp", | |
407 | .max_speed = USB_SPEED_HIGH, | |
408 | .unbind = dbgp_unbind, | |
409 | .setup = dbgp_setup, | |
410 | .disconnect = dbgp_disconnect, | |
411 | .driver = { | |
412 | .owner = THIS_MODULE, | |
413 | .name = "dbgp" | |
414 | }, | |
415 | }; | |
416 | ||
417 | static int __init dbgp_init(void) | |
418 | { | |
419 | return usb_gadget_probe_driver(&dbgp_driver, dbgp_bind); | |
420 | } | |
421 | ||
422 | static void __exit dbgp_exit(void) | |
423 | { | |
424 | usb_gadget_unregister_driver(&dbgp_driver); | |
425 | #ifdef CONFIG_USB_G_DBGP_SERIAL | |
426 | gserial_cleanup(); | |
427 | #endif | |
428 | } | |
429 | ||
430 | MODULE_AUTHOR("Stephane Duverger"); | |
431 | MODULE_LICENSE("GPL"); | |
432 | module_init(dbgp_init); | |
433 | module_exit(dbgp_exit); |