Commit | Line | Data |
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f6c826a9 | 1 | /* |
2 | * dbgp.c -- EHCI Debug Port device gadget | |
3 | * | |
4 | * Copyright (C) 2010 Stephane Duverger | |
5 | * | |
6 | * Released under the GPLv2. | |
f6c826a9 | 7 | */ |
8 | ||
9 | /* verbose messages */ | |
10 | #include <linux/kernel.h> | |
11 | #include <linux/device.h> | |
6eb0de82 | 12 | #include <linux/module.h> |
f6c826a9 | 13 | #include <linux/usb/ch9.h> |
14 | #include <linux/usb/gadget.h> | |
15 | ||
3249ca22 | 16 | #include "u_serial.h" |
f6c826a9 | 17 | |
18 | #define DRIVER_VENDOR_ID 0x0525 /* NetChip */ | |
19 | #define DRIVER_PRODUCT_ID 0xc0de /* undefined */ | |
20 | ||
21 | #define USB_DEBUG_MAX_PACKET_SIZE 8 | |
22 | #define DBGP_REQ_EP0_LEN 128 | |
23 | #define DBGP_REQ_LEN 512 | |
24 | ||
25 | static struct dbgp { | |
26 | struct usb_gadget *gadget; | |
27 | struct usb_request *req; | |
28 | struct usb_ep *i_ep; | |
29 | struct usb_ep *o_ep; | |
30 | #ifdef CONFIG_USB_G_DBGP_SERIAL | |
31 | struct gserial *serial; | |
32 | #endif | |
33 | } dbgp; | |
34 | ||
35 | static struct usb_device_descriptor device_desc = { | |
36 | .bLength = sizeof device_desc, | |
37 | .bDescriptorType = USB_DT_DEVICE, | |
b8464bcf | 38 | .bcdUSB = cpu_to_le16(0x0200), |
f6c826a9 | 39 | .bDeviceClass = USB_CLASS_VENDOR_SPEC, |
b8464bcf VT |
40 | .idVendor = cpu_to_le16(DRIVER_VENDOR_ID), |
41 | .idProduct = cpu_to_le16(DRIVER_PRODUCT_ID), | |
f6c826a9 | 42 | .bNumConfigurations = 1, |
43 | }; | |
44 | ||
45 | static struct usb_debug_descriptor dbg_desc = { | |
46 | .bLength = sizeof dbg_desc, | |
47 | .bDescriptorType = USB_DT_DEBUG, | |
48 | }; | |
49 | ||
50 | static struct usb_endpoint_descriptor i_desc = { | |
51 | .bLength = USB_DT_ENDPOINT_SIZE, | |
52 | .bDescriptorType = USB_DT_ENDPOINT, | |
53 | .bmAttributes = USB_ENDPOINT_XFER_BULK, | |
54 | .bEndpointAddress = USB_DIR_IN, | |
55 | }; | |
56 | ||
57 | static struct usb_endpoint_descriptor o_desc = { | |
58 | .bLength = USB_DT_ENDPOINT_SIZE, | |
59 | .bDescriptorType = USB_DT_ENDPOINT, | |
60 | .bmAttributes = USB_ENDPOINT_XFER_BULK, | |
61 | .bEndpointAddress = USB_DIR_OUT, | |
62 | }; | |
63 | ||
64 | #ifdef CONFIG_USB_G_DBGP_PRINTK | |
65 | static int dbgp_consume(char *buf, unsigned len) | |
66 | { | |
67 | char c; | |
68 | ||
69 | if (!len) | |
70 | return 0; | |
71 | ||
72 | c = buf[len-1]; | |
73 | if (c != 0) | |
74 | buf[len-1] = 0; | |
75 | ||
76 | printk(KERN_NOTICE "%s%c", buf, c); | |
77 | return 0; | |
78 | } | |
79 | ||
80 | static void __disable_ep(struct usb_ep *ep) | |
81 | { | |
82 | if (ep && ep->driver_data == dbgp.gadget) { | |
83 | usb_ep_disable(ep); | |
84 | ep->driver_data = NULL; | |
85 | } | |
86 | } | |
87 | ||
88 | static void dbgp_disable_ep(void) | |
89 | { | |
90 | __disable_ep(dbgp.i_ep); | |
91 | __disable_ep(dbgp.o_ep); | |
92 | } | |
93 | ||
94 | static void dbgp_complete(struct usb_ep *ep, struct usb_request *req) | |
95 | { | |
96 | int stp; | |
97 | int err = 0; | |
98 | int status = req->status; | |
99 | ||
100 | if (ep == dbgp.i_ep) { | |
101 | stp = 1; | |
102 | goto fail; | |
103 | } | |
104 | ||
105 | if (status != 0) { | |
106 | stp = 2; | |
107 | goto release_req; | |
108 | } | |
109 | ||
110 | dbgp_consume(req->buf, req->actual); | |
111 | ||
112 | req->length = DBGP_REQ_LEN; | |
113 | err = usb_ep_queue(ep, req, GFP_ATOMIC); | |
114 | if (err < 0) { | |
115 | stp = 3; | |
116 | goto release_req; | |
117 | } | |
118 | ||
119 | return; | |
120 | ||
121 | release_req: | |
122 | kfree(req->buf); | |
123 | usb_ep_free_request(dbgp.o_ep, req); | |
124 | dbgp_disable_ep(); | |
125 | fail: | |
126 | dev_dbg(&dbgp.gadget->dev, | |
127 | "complete: failure (%d:%d) ==> %d\n", stp, err, status); | |
128 | } | |
129 | ||
130 | static int dbgp_enable_ep_req(struct usb_ep *ep) | |
131 | { | |
132 | int err, stp; | |
133 | struct usb_request *req; | |
134 | ||
135 | req = usb_ep_alloc_request(ep, GFP_KERNEL); | |
136 | if (!req) { | |
137 | err = -ENOMEM; | |
138 | stp = 1; | |
139 | goto fail_1; | |
140 | } | |
141 | ||
142 | req->buf = kmalloc(DBGP_REQ_LEN, GFP_KERNEL); | |
143 | if (!req->buf) { | |
144 | err = -ENOMEM; | |
145 | stp = 2; | |
146 | goto fail_2; | |
147 | } | |
148 | ||
149 | req->complete = dbgp_complete; | |
150 | req->length = DBGP_REQ_LEN; | |
151 | err = usb_ep_queue(ep, req, GFP_ATOMIC); | |
152 | if (err < 0) { | |
153 | stp = 3; | |
154 | goto fail_3; | |
155 | } | |
156 | ||
157 | return 0; | |
158 | ||
159 | fail_3: | |
160 | kfree(req->buf); | |
161 | fail_2: | |
162 | usb_ep_free_request(dbgp.o_ep, req); | |
163 | fail_1: | |
164 | dev_dbg(&dbgp.gadget->dev, | |
165 | "enable ep req: failure (%d:%d)\n", stp, err); | |
166 | return err; | |
167 | } | |
168 | ||
169 | static int __enable_ep(struct usb_ep *ep, struct usb_endpoint_descriptor *desc) | |
170 | { | |
72c973dd TB |
171 | int err; |
172 | ep->desc = desc; | |
173 | err = usb_ep_enable(ep); | |
f6c826a9 | 174 | ep->driver_data = dbgp.gadget; |
175 | return err; | |
176 | } | |
177 | ||
178 | static int dbgp_enable_ep(void) | |
179 | { | |
180 | int err, stp; | |
181 | ||
182 | err = __enable_ep(dbgp.i_ep, &i_desc); | |
183 | if (err < 0) { | |
184 | stp = 1; | |
185 | goto fail_1; | |
186 | } | |
187 | ||
188 | err = __enable_ep(dbgp.o_ep, &o_desc); | |
189 | if (err < 0) { | |
190 | stp = 2; | |
191 | goto fail_2; | |
192 | } | |
193 | ||
194 | err = dbgp_enable_ep_req(dbgp.o_ep); | |
195 | if (err < 0) { | |
196 | stp = 3; | |
197 | goto fail_3; | |
198 | } | |
199 | ||
200 | return 0; | |
201 | ||
202 | fail_3: | |
203 | __disable_ep(dbgp.o_ep); | |
204 | fail_2: | |
205 | __disable_ep(dbgp.i_ep); | |
206 | fail_1: | |
207 | dev_dbg(&dbgp.gadget->dev, "enable ep: failure (%d:%d)\n", stp, err); | |
208 | return err; | |
209 | } | |
210 | #endif | |
211 | ||
212 | static void dbgp_disconnect(struct usb_gadget *gadget) | |
213 | { | |
214 | #ifdef CONFIG_USB_G_DBGP_PRINTK | |
215 | dbgp_disable_ep(); | |
216 | #else | |
217 | gserial_disconnect(dbgp.serial); | |
218 | #endif | |
219 | } | |
220 | ||
221 | static void dbgp_unbind(struct usb_gadget *gadget) | |
222 | { | |
223 | #ifdef CONFIG_USB_G_DBGP_SERIAL | |
224 | kfree(dbgp.serial); | |
4958cf32 | 225 | dbgp.serial = NULL; |
f6c826a9 | 226 | #endif |
227 | if (dbgp.req) { | |
228 | kfree(dbgp.req->buf); | |
229 | usb_ep_free_request(gadget->ep0, dbgp.req); | |
4958cf32 | 230 | dbgp.req = NULL; |
f6c826a9 | 231 | } |
232 | ||
233 | gadget->ep0->driver_data = NULL; | |
234 | } | |
235 | ||
19b10a88 SAS |
236 | #ifdef CONFIG_USB_G_DBGP_SERIAL |
237 | static unsigned char tty_line; | |
238 | #endif | |
239 | ||
6876d58f | 240 | static int dbgp_configure_endpoints(struct usb_gadget *gadget) |
f6c826a9 | 241 | { |
242 | int stp; | |
243 | ||
244 | usb_ep_autoconfig_reset(gadget); | |
245 | ||
246 | dbgp.i_ep = usb_ep_autoconfig(gadget, &i_desc); | |
247 | if (!dbgp.i_ep) { | |
248 | stp = 1; | |
249 | goto fail_1; | |
250 | } | |
251 | ||
252 | dbgp.i_ep->driver_data = gadget; | |
253 | i_desc.wMaxPacketSize = | |
b8464bcf | 254 | cpu_to_le16(USB_DEBUG_MAX_PACKET_SIZE); |
f6c826a9 | 255 | |
256 | dbgp.o_ep = usb_ep_autoconfig(gadget, &o_desc); | |
257 | if (!dbgp.o_ep) { | |
258 | dbgp.i_ep->driver_data = NULL; | |
259 | stp = 2; | |
260 | goto fail_2; | |
261 | } | |
262 | ||
263 | dbgp.o_ep->driver_data = gadget; | |
264 | o_desc.wMaxPacketSize = | |
b8464bcf | 265 | cpu_to_le16(USB_DEBUG_MAX_PACKET_SIZE); |
f6c826a9 | 266 | |
a8779ee9 SS |
267 | dbg_desc.bDebugInEndpoint = i_desc.bEndpointAddress; |
268 | dbg_desc.bDebugOutEndpoint = o_desc.bEndpointAddress; | |
f6c826a9 | 269 | |
270 | #ifdef CONFIG_USB_G_DBGP_SERIAL | |
271 | dbgp.serial->in = dbgp.i_ep; | |
272 | dbgp.serial->out = dbgp.o_ep; | |
273 | ||
72c973dd TB |
274 | dbgp.serial->in->desc = &i_desc; |
275 | dbgp.serial->out->desc = &o_desc; | |
6876d58f | 276 | #endif |
f6c826a9 | 277 | |
278 | return 0; | |
279 | ||
f6c826a9 | 280 | fail_2: |
281 | dbgp.i_ep->driver_data = NULL; | |
282 | fail_1: | |
283 | dev_dbg(&dbgp.gadget->dev, "ep config: failure (%d)\n", stp); | |
284 | return -ENODEV; | |
285 | } | |
286 | ||
c94e289f | 287 | static int dbgp_bind(struct usb_gadget *gadget, |
ffe0b335 | 288 | struct usb_gadget_driver *driver) |
f6c826a9 | 289 | { |
290 | int err, stp; | |
291 | ||
292 | dbgp.gadget = gadget; | |
293 | ||
294 | dbgp.req = usb_ep_alloc_request(gadget->ep0, GFP_KERNEL); | |
295 | if (!dbgp.req) { | |
296 | err = -ENOMEM; | |
297 | stp = 1; | |
298 | goto fail; | |
299 | } | |
300 | ||
301 | dbgp.req->buf = kmalloc(DBGP_REQ_EP0_LEN, GFP_KERNEL); | |
302 | if (!dbgp.req->buf) { | |
303 | err = -ENOMEM; | |
304 | stp = 2; | |
305 | goto fail; | |
306 | } | |
307 | ||
308 | dbgp.req->length = DBGP_REQ_EP0_LEN; | |
309 | gadget->ep0->driver_data = gadget; | |
310 | ||
311 | #ifdef CONFIG_USB_G_DBGP_SERIAL | |
312 | dbgp.serial = kzalloc(sizeof(struct gserial), GFP_KERNEL); | |
313 | if (!dbgp.serial) { | |
314 | stp = 3; | |
315 | err = -ENOMEM; | |
316 | goto fail; | |
317 | } | |
6876d58f KM |
318 | |
319 | if (gserial_alloc_line(&tty_line)) { | |
320 | stp = 4; | |
321 | err = -ENODEV; | |
322 | goto fail; | |
323 | } | |
f6c826a9 | 324 | #endif |
6876d58f | 325 | |
f6c826a9 | 326 | err = dbgp_configure_endpoints(gadget); |
327 | if (err < 0) { | |
6876d58f | 328 | stp = 5; |
f6c826a9 | 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); | |
1744020c SS |
355 | int err = -EOPNOTSUPP; |
356 | void *data = NULL; | |
357 | u16 len = 0; | |
f6c826a9 | 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; | |
765f5b83 | 367 | device_desc.bMaxPacketSize0 = gadget->ep0->maxpacket; |
f6c826a9 | 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 | } | |
1744020c | 377 | err = 0; |
f6c826a9 | 378 | } else if (request == USB_REQ_SET_FEATURE && |
379 | value == USB_DEVICE_DEBUG_MODE) { | |
f6c826a9 | 380 | dev_dbg(&dbgp.gadget->dev, "setup: feat debug\n"); |
381 | #ifdef CONFIG_USB_G_DBGP_PRINTK | |
382 | err = dbgp_enable_ep(); | |
383 | #else | |
6876d58f KM |
384 | err = dbgp_configure_endpoints(gadget); |
385 | if (err < 0) { | |
386 | goto fail; | |
387 | } | |
19b10a88 | 388 | err = gserial_connect(dbgp.serial, tty_line); |
f6c826a9 | 389 | #endif |
390 | if (err < 0) | |
391 | goto fail; | |
392 | } else | |
393 | goto fail; | |
394 | ||
c6a76781 DC |
395 | req->length = min(length, len); |
396 | req->zero = len < req->length; | |
397 | if (data && req->length) | |
398 | memcpy(req->buf, data, req->length); | |
399 | ||
400 | req->complete = dbgp_setup_complete; | |
401 | return usb_ep_queue(gadget->ep0, req, GFP_ATOMIC); | |
f6c826a9 | 402 | |
403 | fail: | |
404 | dev_dbg(&dbgp.gadget->dev, | |
405 | "setup: failure req %x v %x\n", request, value); | |
406 | return err; | |
407 | } | |
408 | ||
c94e289f | 409 | static struct usb_gadget_driver dbgp_driver = { |
f6c826a9 | 410 | .function = "dbgp", |
7177aed4 | 411 | .max_speed = USB_SPEED_HIGH, |
93952956 | 412 | .bind = dbgp_bind, |
f6c826a9 | 413 | .unbind = dbgp_unbind, |
414 | .setup = dbgp_setup, | |
e45cfa20 | 415 | .reset = dbgp_disconnect, |
f6c826a9 | 416 | .disconnect = dbgp_disconnect, |
417 | .driver = { | |
418 | .owner = THIS_MODULE, | |
419 | .name = "dbgp" | |
420 | }, | |
421 | }; | |
422 | ||
423 | static int __init dbgp_init(void) | |
424 | { | |
93952956 | 425 | return usb_gadget_probe_driver(&dbgp_driver); |
f6c826a9 | 426 | } |
427 | ||
428 | static void __exit dbgp_exit(void) | |
429 | { | |
430 | usb_gadget_unregister_driver(&dbgp_driver); | |
431 | #ifdef CONFIG_USB_G_DBGP_SERIAL | |
19b10a88 | 432 | gserial_free_line(tty_line); |
f6c826a9 | 433 | #endif |
434 | } | |
435 | ||
436 | MODULE_AUTHOR("Stephane Duverger"); | |
437 | MODULE_LICENSE("GPL"); | |
438 | module_init(dbgp_init); | |
439 | module_exit(dbgp_exit); |