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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#include "u_serial.h"
17
18#define DRIVER_VENDOR_ID 0x0525
19#define DRIVER_PRODUCT_ID 0xc0de
20
21#define USB_DEBUG_MAX_PACKET_SIZE 8
22#define DBGP_REQ_EP0_LEN 128
23#define DBGP_REQ_LEN 512
24
25static 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
35static struct usb_device_descriptor device_desc = {
36 .bLength = sizeof device_desc,
37 .bDescriptorType = USB_DT_DEVICE,
38 .bcdUSB = __constant_cpu_to_le16(0x0200),
39 .bDeviceClass = USB_CLASS_VENDOR_SPEC,
40 .idVendor = __constant_cpu_to_le16(DRIVER_VENDOR_ID),
41 .idProduct = __constant_cpu_to_le16(DRIVER_PRODUCT_ID),
42 .bNumConfigurations = 1,
43};
44
45static struct usb_debug_descriptor dbg_desc = {
46 .bLength = sizeof dbg_desc,
47 .bDescriptorType = USB_DT_DEBUG,
48};
49
50static 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
57static 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
65static 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
80static 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
88static void dbgp_disable_ep(void)
89{
90 __disable_ep(dbgp.i_ep);
91 __disable_ep(dbgp.o_ep);
92}
93
94static 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
121release_req:
122 kfree(req->buf);
123 usb_ep_free_request(dbgp.o_ep, req);
124 dbgp_disable_ep();
125fail:
126 dev_dbg(&dbgp.gadget->dev,
127 "complete: failure (%d:%d) ==> %d\n", stp, err, status);
128}
129
130static 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
159fail_3:
160 kfree(req->buf);
161fail_2:
162 usb_ep_free_request(dbgp.o_ep, req);
163fail_1:
164 dev_dbg(&dbgp.gadget->dev,
165 "enable ep req: failure (%d:%d)\n", stp, err);
166 return err;
167}
168
169static int __enable_ep(struct usb_ep *ep, struct usb_endpoint_descriptor *desc)
170{
171 int err;
172 ep->desc = desc;
173 err = usb_ep_enable(ep);
174 ep->driver_data = dbgp.gadget;
175 return err;
176}
177
178static 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
202fail_3:
203 __disable_ep(dbgp.o_ep);
204fail_2:
205 __disable_ep(dbgp.i_ep);
206fail_1:
207 dev_dbg(&dbgp.gadget->dev, "enable ep: failure (%d:%d)\n", stp, err);
208 return err;
209}
210#endif
211
212static 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
221static void dbgp_unbind(struct usb_gadget *gadget)
222{
223#ifdef CONFIG_USB_G_DBGP_SERIAL
224 kfree(dbgp.serial);
225#endif
226 if (dbgp.req) {
227 kfree(dbgp.req->buf);
228 usb_ep_free_request(gadget->ep0, dbgp.req);
229 }
230
231 gadget->ep0->driver_data = NULL;
232}
233
234#ifdef CONFIG_USB_G_DBGP_SERIAL
235static unsigned char tty_line;
236#endif
237
238static int __init dbgp_configure_endpoints(struct usb_gadget *gadget)
239{
240 int stp;
241
242 usb_ep_autoconfig_reset(gadget);
243
244 dbgp.i_ep = usb_ep_autoconfig(gadget, &i_desc);
245 if (!dbgp.i_ep) {
246 stp = 1;
247 goto fail_1;
248 }
249
250 dbgp.i_ep->driver_data = gadget;
251 i_desc.wMaxPacketSize =
252 __constant_cpu_to_le16(USB_DEBUG_MAX_PACKET_SIZE);
253
254 dbgp.o_ep = usb_ep_autoconfig(gadget, &o_desc);
255 if (!dbgp.o_ep) {
256 dbgp.i_ep->driver_data = NULL;
257 stp = 2;
258 goto fail_2;
259 }
260
261 dbgp.o_ep->driver_data = gadget;
262 o_desc.wMaxPacketSize =
263 __constant_cpu_to_le16(USB_DEBUG_MAX_PACKET_SIZE);
264
265 dbg_desc.bDebugInEndpoint = i_desc.bEndpointAddress;
266 dbg_desc.bDebugOutEndpoint = o_desc.bEndpointAddress;
267
268#ifdef CONFIG_USB_G_DBGP_SERIAL
269 dbgp.serial->in = dbgp.i_ep;
270 dbgp.serial->out = dbgp.o_ep;
271
272 dbgp.serial->in->desc = &i_desc;
273 dbgp.serial->out->desc = &o_desc;
274
275 if (gserial_alloc_line(&tty_line)) {
276 stp = 3;
277 goto fail_3;
278 }
279
280 return 0;
281
282fail_3:
283 dbgp.o_ep->driver_data = NULL;
284#else
285 return 0;
286#endif
287fail_2:
288 dbgp.i_ep->driver_data = NULL;
289fail_1:
290 dev_dbg(&dbgp.gadget->dev, "ep config: failure (%d)\n", stp);
291 return -ENODEV;
292}
293
294static int __init dbgp_bind(struct usb_gadget *gadget,
295 struct usb_gadget_driver *driver)
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
335fail:
336 dev_dbg(&gadget->dev, "bind: failure (%d:%d)\n", stp, err);
337 dbgp_unbind(gadget);
338 return err;
339}
340
341static 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
348static 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, tty_line);
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
399fail:
400 dev_dbg(&dbgp.gadget->dev,
401 "setup: failure req %x v %x\n", request, value);
402 return err;
403}
404
405static __refdata struct usb_gadget_driver dbgp_driver = {
406 .function = "dbgp",
407 .max_speed = USB_SPEED_HIGH,
408 .bind = dbgp_bind,
409 .unbind = dbgp_unbind,
410 .setup = dbgp_setup,
411 .disconnect = dbgp_disconnect,
412 .driver = {
413 .owner = THIS_MODULE,
414 .name = "dbgp"
415 },
416};
417
418static int __init dbgp_init(void)
419{
420 return usb_gadget_probe_driver(&dbgp_driver);
421}
422
423static void __exit dbgp_exit(void)
424{
425 usb_gadget_unregister_driver(&dbgp_driver);
426#ifdef CONFIG_USB_G_DBGP_SERIAL
427 gserial_free_line(tty_line);
428#endif
429}
430
431MODULE_AUTHOR("Stephane Duverger");
432MODULE_LICENSE("GPL");
433module_init(dbgp_init);
434module_exit(dbgp_exit);
435
