2 * dbgp.c -- EHCI Debug Port device gadget
4 * Copyright (C) 2010 Stephane Duverger
6 * Released under the GPLv2.
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>
16 #ifdef CONFIG_USB_G_DBGP_SERIAL
20 #define DRIVER_VENDOR_ID 0x0525 /* NetChip */
21 #define DRIVER_PRODUCT_ID 0xc0de /* undefined */
23 #define USB_DEBUG_MAX_PACKET_SIZE 8
24 #define DBGP_REQ_EP0_LEN 128
25 #define DBGP_REQ_LEN 512
28 struct usb_gadget *gadget;
29 struct usb_request *req;
32 #ifdef CONFIG_USB_G_DBGP_SERIAL
33 struct gserial *serial;
37 static struct usb_device_descriptor device_desc = {
38 .bLength = sizeof device_desc,
39 .bDescriptorType = USB_DT_DEVICE,
40 .bcdUSB = __constant_cpu_to_le16(0x0200),
41 .bDeviceClass = USB_CLASS_VENDOR_SPEC,
42 .idVendor = __constant_cpu_to_le16(DRIVER_VENDOR_ID),
43 .idProduct = __constant_cpu_to_le16(DRIVER_PRODUCT_ID),
44 .bNumConfigurations = 1,
47 static struct usb_debug_descriptor dbg_desc = {
48 .bLength = sizeof dbg_desc,
49 .bDescriptorType = USB_DT_DEBUG,
52 static struct usb_endpoint_descriptor i_desc = {
53 .bLength = USB_DT_ENDPOINT_SIZE,
54 .bDescriptorType = USB_DT_ENDPOINT,
55 .bmAttributes = USB_ENDPOINT_XFER_BULK,
56 .bEndpointAddress = USB_DIR_IN,
59 static struct usb_endpoint_descriptor o_desc = {
60 .bLength = USB_DT_ENDPOINT_SIZE,
61 .bDescriptorType = USB_DT_ENDPOINT,
62 .bmAttributes = USB_ENDPOINT_XFER_BULK,
63 .bEndpointAddress = USB_DIR_OUT,
66 #ifdef CONFIG_USB_G_DBGP_PRINTK
67 static int dbgp_consume(char *buf, unsigned len)
78 printk(KERN_NOTICE "%s%c", buf, c);
82 static void __disable_ep(struct usb_ep *ep)
84 if (ep && ep->driver_data == dbgp.gadget) {
86 ep->driver_data = NULL;
90 static void dbgp_disable_ep(void)
92 __disable_ep(dbgp.i_ep);
93 __disable_ep(dbgp.o_ep);
96 static void dbgp_complete(struct usb_ep *ep, struct usb_request *req)
100 int status = req->status;
102 if (ep == dbgp.i_ep) {
112 dbgp_consume(req->buf, req->actual);
114 req->length = DBGP_REQ_LEN;
115 err = usb_ep_queue(ep, req, GFP_ATOMIC);
125 usb_ep_free_request(dbgp.o_ep, req);
128 dev_dbg(&dbgp.gadget->dev,
129 "complete: failure (%d:%d) ==> %d\n", stp, err, status);
132 static int dbgp_enable_ep_req(struct usb_ep *ep)
135 struct usb_request *req;
137 req = usb_ep_alloc_request(ep, GFP_KERNEL);
144 req->buf = kmalloc(DBGP_REQ_LEN, GFP_KERNEL);
151 req->complete = dbgp_complete;
152 req->length = DBGP_REQ_LEN;
153 err = usb_ep_queue(ep, req, GFP_ATOMIC);
164 usb_ep_free_request(dbgp.o_ep, req);
166 dev_dbg(&dbgp.gadget->dev,
167 "enable ep req: failure (%d:%d)\n", stp, err);
171 static int __enable_ep(struct usb_ep *ep, struct usb_endpoint_descriptor *desc)
175 err = usb_ep_enable(ep);
176 ep->driver_data = dbgp.gadget;
180 static int dbgp_enable_ep(void)
184 err = __enable_ep(dbgp.i_ep, &i_desc);
190 err = __enable_ep(dbgp.o_ep, &o_desc);
196 err = dbgp_enable_ep_req(dbgp.o_ep);
205 __disable_ep(dbgp.o_ep);
207 __disable_ep(dbgp.i_ep);
209 dev_dbg(&dbgp.gadget->dev, "enable ep: failure (%d:%d)\n", stp, err);
214 static void dbgp_disconnect(struct usb_gadget *gadget)
216 #ifdef CONFIG_USB_G_DBGP_PRINTK
219 gserial_disconnect(dbgp.serial);
223 static void dbgp_unbind(struct usb_gadget *gadget)
225 #ifdef CONFIG_USB_G_DBGP_SERIAL
229 kfree(dbgp.req->buf);
230 usb_ep_free_request(gadget->ep0, dbgp.req);
233 gadget->ep0->driver_data = NULL;
236 static int __init dbgp_configure_endpoints(struct usb_gadget *gadget)
240 usb_ep_autoconfig_reset(gadget);
242 dbgp.i_ep = usb_ep_autoconfig(gadget, &i_desc);
248 dbgp.i_ep->driver_data = gadget;
249 i_desc.wMaxPacketSize =
250 __constant_cpu_to_le16(USB_DEBUG_MAX_PACKET_SIZE);
252 dbgp.o_ep = usb_ep_autoconfig(gadget, &o_desc);
254 dbgp.i_ep->driver_data = NULL;
259 dbgp.o_ep->driver_data = gadget;
260 o_desc.wMaxPacketSize =
261 __constant_cpu_to_le16(USB_DEBUG_MAX_PACKET_SIZE);
263 dbg_desc.bDebugInEndpoint = i_desc.bEndpointAddress;
264 dbg_desc.bDebugOutEndpoint = o_desc.bEndpointAddress;
266 #ifdef CONFIG_USB_G_DBGP_SERIAL
267 dbgp.serial->in = dbgp.i_ep;
268 dbgp.serial->out = dbgp.o_ep;
270 dbgp.serial->in->desc = &i_desc;
271 dbgp.serial->out->desc = &o_desc;
273 if (gserial_setup(gadget, 1) < 0) {
281 dbgp.o_ep->driver_data = NULL;
286 dbgp.i_ep->driver_data = NULL;
288 dev_dbg(&dbgp.gadget->dev, "ep config: failure (%d)\n", stp);
292 static int __init dbgp_bind(struct usb_gadget *gadget,
293 struct usb_gadget_driver *driver)
297 dbgp.gadget = gadget;
299 dbgp.req = usb_ep_alloc_request(gadget->ep0, GFP_KERNEL);
306 dbgp.req->buf = kmalloc(DBGP_REQ_EP0_LEN, GFP_KERNEL);
307 if (!dbgp.req->buf) {
313 dbgp.req->length = DBGP_REQ_EP0_LEN;
314 gadget->ep0->driver_data = gadget;
316 #ifdef CONFIG_USB_G_DBGP_SERIAL
317 dbgp.serial = kzalloc(sizeof(struct gserial), GFP_KERNEL);
324 err = dbgp_configure_endpoints(gadget);
330 dev_dbg(&dbgp.gadget->dev, "bind: success\n");
334 dev_dbg(&gadget->dev, "bind: failure (%d:%d)\n", stp, err);
339 static void dbgp_setup_complete(struct usb_ep *ep,
340 struct usb_request *req)
342 dev_dbg(&dbgp.gadget->dev, "setup complete: %d, %d/%d\n",
343 req->status, req->actual, req->length);
346 static int dbgp_setup(struct usb_gadget *gadget,
347 const struct usb_ctrlrequest *ctrl)
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 = -EOPNOTSUPP;
357 gadget->ep0->driver_data = gadget;
359 if (request == USB_REQ_GET_DESCRIPTOR) {
362 dev_dbg(&dbgp.gadget->dev, "setup: desc device\n");
363 len = sizeof device_desc;
365 device_desc.bMaxPacketSize0 = gadget->ep0->maxpacket;
368 dev_dbg(&dbgp.gadget->dev, "setup: desc debug\n");
369 len = sizeof dbg_desc;
376 } else if (request == USB_REQ_SET_FEATURE &&
377 value == USB_DEVICE_DEBUG_MODE) {
378 dev_dbg(&dbgp.gadget->dev, "setup: feat debug\n");
379 #ifdef CONFIG_USB_G_DBGP_PRINTK
380 err = dbgp_enable_ep();
382 err = gserial_connect(dbgp.serial, 0);
389 req->length = min(length, len);
390 req->zero = len < req->length;
391 if (data && req->length)
392 memcpy(req->buf, data, req->length);
394 req->complete = dbgp_setup_complete;
395 return usb_ep_queue(gadget->ep0, req, GFP_ATOMIC);
398 dev_dbg(&dbgp.gadget->dev,
399 "setup: failure req %x v %x\n", request, value);
403 static __refdata struct usb_gadget_driver dbgp_driver = {
405 .max_speed = USB_SPEED_HIGH,
407 .unbind = dbgp_unbind,
409 .disconnect = dbgp_disconnect,
411 .owner = THIS_MODULE,
416 static int __init dbgp_init(void)
418 return usb_gadget_probe_driver(&dbgp_driver);
421 static void __exit dbgp_exit(void)
423 usb_gadget_unregister_driver(&dbgp_driver);
424 #ifdef CONFIG_USB_G_DBGP_SERIAL
429 MODULE_AUTHOR("Stephane Duverger");
430 MODULE_LICENSE("GPL");
431 module_init(dbgp_init);
432 module_exit(dbgp_exit);