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stephane duvergerf6c826a2010-07-12 18:37:53 +02001/*
2 * dbgp.c -- EHCI Debug Port device gadget
3 *
4 * Copyright (C) 2010 Stephane Duverger
5 *
6 * Released under the GPLv2.
7 *
8 */
9
10/* verbose messages */
11#include <linux/kernel.h>
12#include <linux/device.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
30static 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
40static 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
50static struct usb_debug_descriptor dbg_desc = {
51 .bLength = sizeof dbg_desc,
52 .bDescriptorType = USB_DT_DEBUG,
53};
54
55static 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
62static 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
70static 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
85static 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
93static void dbgp_disable_ep(void)
94{
95 __disable_ep(dbgp.i_ep);
96 __disable_ep(dbgp.o_ep);
97}
98
99static 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
126release_req:
127 kfree(req->buf);
128 usb_ep_free_request(dbgp.o_ep, req);
129 dbgp_disable_ep();
130fail:
131 dev_dbg(&dbgp.gadget->dev,
132 "complete: failure (%d:%d) ==> %d\n", stp, err, status);
133}
134
135static 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
164fail_3:
165 kfree(req->buf);
166fail_2:
167 usb_ep_free_request(dbgp.o_ep, req);
168fail_1:
169 dev_dbg(&dbgp.gadget->dev,
170 "enable ep req: failure (%d:%d)\n", stp, err);
171 return err;
172}
173
174static int __enable_ep(struct usb_ep *ep, struct usb_endpoint_descriptor *desc)
175{
176 int err = usb_ep_enable(ep, desc);
177 ep->driver_data = dbgp.gadget;
178 return err;
179}
180
181static int dbgp_enable_ep(void)
182{
183 int err, stp;
184
185 err = __enable_ep(dbgp.i_ep, &i_desc);
186 if (err < 0) {
187 stp = 1;
188 goto fail_1;
189 }
190
191 err = __enable_ep(dbgp.o_ep, &o_desc);
192 if (err < 0) {
193 stp = 2;
194 goto fail_2;
195 }
196
197 err = dbgp_enable_ep_req(dbgp.o_ep);
198 if (err < 0) {
199 stp = 3;
200 goto fail_3;
201 }
202
203 return 0;
204
205fail_3:
206 __disable_ep(dbgp.o_ep);
207fail_2:
208 __disable_ep(dbgp.i_ep);
209fail_1:
210 dev_dbg(&dbgp.gadget->dev, "enable ep: failure (%d:%d)\n", stp, err);
211 return err;
212}
213#endif
214
215static void dbgp_disconnect(struct usb_gadget *gadget)
216{
217#ifdef CONFIG_USB_G_DBGP_PRINTK
218 dbgp_disable_ep();
219#else
220 gserial_disconnect(dbgp.serial);
221#endif
222}
223
224static void dbgp_unbind(struct usb_gadget *gadget)
225{
226#ifdef CONFIG_USB_G_DBGP_SERIAL
227 kfree(dbgp.serial);
228#endif
229 if (dbgp.req) {
230 kfree(dbgp.req->buf);
231 usb_ep_free_request(gadget->ep0, dbgp.req);
232 }
233
234 gadget->ep0->driver_data = NULL;
235}
236
237static int __init dbgp_configure_endpoints(struct usb_gadget *gadget)
238{
239 int stp;
240
241 usb_ep_autoconfig_reset(gadget);
242
243 dbgp.i_ep = usb_ep_autoconfig(gadget, &i_desc);
244 if (!dbgp.i_ep) {
245 stp = 1;
246 goto fail_1;
247 }
248
249 dbgp.i_ep->driver_data = gadget;
250 i_desc.wMaxPacketSize =
251 __constant_cpu_to_le16(USB_DEBUG_MAX_PACKET_SIZE);
252
253 dbgp.o_ep = usb_ep_autoconfig(gadget, &o_desc);
254 if (!dbgp.o_ep) {
255 dbgp.i_ep->driver_data = NULL;
256 stp = 2;
257 goto fail_2;
258 }
259
260 dbgp.o_ep->driver_data = gadget;
261 o_desc.wMaxPacketSize =
262 __constant_cpu_to_le16(USB_DEBUG_MAX_PACKET_SIZE);
263
264 dbg_desc.bDebugInEndpoint = i_desc.bEndpointAddress & 0x7f;
265 dbg_desc.bDebugOutEndpoint = o_desc.bEndpointAddress & 0x7f;
266
267#ifdef CONFIG_USB_G_DBGP_SERIAL
268 dbgp.serial->in = dbgp.i_ep;
269 dbgp.serial->out = dbgp.o_ep;
270
271 dbgp.serial->in_desc = &i_desc;
272 dbgp.serial->out_desc = &o_desc;
273
274 if (gserial_setup(gadget, 1) < 0) {
275 stp = 3;
276 goto fail_3;
277 }
278
279 return 0;
280
281fail_3:
282 dbgp.o_ep->driver_data = NULL;
283#else
284 return 0;
285#endif
286fail_2:
287 dbgp.i_ep->driver_data = NULL;
288fail_1:
289 dev_dbg(&dbgp.gadget->dev, "ep config: failure (%d)\n", stp);
290 return -ENODEV;
291}
292
293static int __init dbgp_bind(struct usb_gadget *gadget)
294{
295 int err, stp;
296
297 dbgp.gadget = gadget;
298
299 dbgp.req = usb_ep_alloc_request(gadget->ep0, GFP_KERNEL);
300 if (!dbgp.req) {
301 err = -ENOMEM;
302 stp = 1;
303 goto fail;
304 }
305
306 dbgp.req->buf = kmalloc(DBGP_REQ_EP0_LEN, GFP_KERNEL);
307 if (!dbgp.req->buf) {
308 err = -ENOMEM;
309 stp = 2;
310 goto fail;
311 }
312
313 dbgp.req->length = DBGP_REQ_EP0_LEN;
314 gadget->ep0->driver_data = gadget;
315
316#ifdef CONFIG_USB_G_DBGP_SERIAL
317 dbgp.serial = kzalloc(sizeof(struct gserial), GFP_KERNEL);
318 if (!dbgp.serial) {
319 stp = 3;
320 err = -ENOMEM;
321 goto fail;
322 }
323#endif
324 err = dbgp_configure_endpoints(gadget);
325 if (err < 0) {
326 stp = 4;
327 goto fail;
328 }
329
330 dev_dbg(&dbgp.gadget->dev, "bind: success\n");
331 return 0;
332
333fail:
334 dev_dbg(&gadget->dev, "bind: failure (%d:%d)\n", stp, err);
335 dbgp_unbind(gadget);
336 return err;
337}
338
339static void dbgp_setup_complete(struct usb_ep *ep,
340 struct usb_request *req)
341{
342 dev_dbg(&dbgp.gadget->dev, "setup complete: %d, %d/%d\n",
343 req->status, req->actual, req->length);
344}
345
346static int dbgp_setup(struct usb_gadget *gadget,
347 const struct usb_ctrlrequest *ctrl)
348{
349 struct usb_request *req = dbgp.req;
350 u8 request = ctrl->bRequest;
351 u16 value = le16_to_cpu(ctrl->wValue);
352 u16 length = le16_to_cpu(ctrl->wLength);
353 int err = 0;
354 void *data;
355 u16 len;
356
357 gadget->ep0->driver_data = gadget;
358
359 if (request == USB_REQ_GET_DESCRIPTOR) {
360 switch (value>>8) {
361 case USB_DT_DEVICE:
362 dev_dbg(&dbgp.gadget->dev, "setup: desc device\n");
363 len = sizeof device_desc;
364 data = &device_desc;
365 break;
366 case USB_DT_DEBUG:
367 dev_dbg(&dbgp.gadget->dev, "setup: desc debug\n");
368 len = sizeof dbg_desc;
369 data = &dbg_desc;
370 break;
371 default:
372 goto fail;
373 }
374 } else if (request == USB_REQ_SET_FEATURE &&
375 value == USB_DEVICE_DEBUG_MODE) {
376 len = 0;
377 data = NULL;
378 dev_dbg(&dbgp.gadget->dev, "setup: feat debug\n");
379#ifdef CONFIG_USB_G_DBGP_PRINTK
380 err = dbgp_enable_ep();
381#else
382 err = gserial_connect(dbgp.serial, 0);
383#endif
384 if (err < 0)
385 goto fail;
386 } else
387 goto fail;
388
Dan Carpenterc6a76782010-08-12 09:40:30 +0200389 req->length = min(length, len);
390 req->zero = len < req->length;
391 if (data && req->length)
392 memcpy(req->buf, data, req->length);
stephane duvergerf6c826a2010-07-12 18:37:53 +0200393
Dan Carpenterc6a76782010-08-12 09:40:30 +0200394 req->complete = dbgp_setup_complete;
395 return usb_ep_queue(gadget->ep0, req, GFP_ATOMIC);
stephane duvergerf6c826a2010-07-12 18:37:53 +0200396
397fail:
398 dev_dbg(&dbgp.gadget->dev,
399 "setup: failure req %x v %x\n", request, value);
400 return err;
401}
402
403static struct usb_gadget_driver dbgp_driver = {
404 .function = "dbgp",
405 .speed = USB_SPEED_HIGH,
stephane duvergerf6c826a2010-07-12 18:37:53 +0200406 .unbind = dbgp_unbind,
407 .setup = dbgp_setup,
408 .disconnect = dbgp_disconnect,
409 .driver = {
410 .owner = THIS_MODULE,
411 .name = "dbgp"
412 },
413};
414
415static int __init dbgp_init(void)
416{
Uwe Kleine-Königb0fca502010-08-12 17:43:53 +0200417 return usb_gadget_probe_driver(&dbgp_driver, dbgp_bind);
stephane duvergerf6c826a2010-07-12 18:37:53 +0200418}
419
420static void __exit dbgp_exit(void)
421{
422 usb_gadget_unregister_driver(&dbgp_driver);
423#ifdef CONFIG_USB_G_DBGP_SERIAL
424 gserial_cleanup();
425#endif
426}
427
428MODULE_AUTHOR("Stephane Duverger");
429MODULE_LICENSE("GPL");
430module_init(dbgp_init);
431module_exit(dbgp_exit);