2 * dbgp.c -- EHCI Debug Port device gadget
4 * Copyright (C) 2010 Stephane Duverger
6 * Released under the GPLv2.
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>
16 /* See comments in "zero.c" */
17 #include "epautoconf.c"
19 #ifdef CONFIG_USB_G_DBGP_SERIAL
23 #define DRIVER_VENDOR_ID 0x0525 /* NetChip */
24 #define DRIVER_PRODUCT_ID 0xc0de /* undefined */
26 #define USB_DEBUG_MAX_PACKET_SIZE 8
27 #define DBGP_REQ_EP0_LEN 128
28 #define DBGP_REQ_LEN 512
31 struct usb_gadget *gadget;
32 struct usb_request *req;
35 #ifdef CONFIG_USB_G_DBGP_SERIAL
36 struct gserial *serial;
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,
50 static struct usb_debug_descriptor dbg_desc = {
51 .bLength = sizeof dbg_desc,
52 .bDescriptorType = USB_DT_DEBUG,
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,
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,
69 #ifdef CONFIG_USB_G_DBGP_PRINTK
70 static int dbgp_consume(char *buf, unsigned len)
81 printk(KERN_NOTICE "%s%c", buf, c);
85 static void __disable_ep(struct usb_ep *ep)
87 if (ep && ep->driver_data == dbgp.gadget) {
89 ep->driver_data = NULL;
93 static void dbgp_disable_ep(void)
95 __disable_ep(dbgp.i_ep);
96 __disable_ep(dbgp.o_ep);
99 static void dbgp_complete(struct usb_ep *ep, struct usb_request *req)
103 int status = req->status;
105 if (ep == dbgp.i_ep) {
115 dbgp_consume(req->buf, req->actual);
117 req->length = DBGP_REQ_LEN;
118 err = usb_ep_queue(ep, req, GFP_ATOMIC);
128 usb_ep_free_request(dbgp.o_ep, req);
131 dev_dbg(&dbgp.gadget->dev,
132 "complete: failure (%d:%d) ==> %d\n", stp, err, status);
135 static int dbgp_enable_ep_req(struct usb_ep *ep)
138 struct usb_request *req;
140 req = usb_ep_alloc_request(ep, GFP_KERNEL);
147 req->buf = kmalloc(DBGP_REQ_LEN, GFP_KERNEL);
154 req->complete = dbgp_complete;
155 req->length = DBGP_REQ_LEN;
156 err = usb_ep_queue(ep, req, GFP_ATOMIC);
167 usb_ep_free_request(dbgp.o_ep, req);
169 dev_dbg(&dbgp.gadget->dev,
170 "enable ep req: failure (%d:%d)\n", stp, err);
174 static int __enable_ep(struct usb_ep *ep, struct usb_endpoint_descriptor *desc)
176 int err = usb_ep_enable(ep, desc);
177 ep->driver_data = dbgp.gadget;
181 static int dbgp_enable_ep(void)
185 err = __enable_ep(dbgp.i_ep, &i_desc);
191 err = __enable_ep(dbgp.o_ep, &o_desc);
197 err = dbgp_enable_ep_req(dbgp.o_ep);
206 __disable_ep(dbgp.o_ep);
208 __disable_ep(dbgp.i_ep);
210 dev_dbg(&dbgp.gadget->dev, "enable ep: failure (%d:%d)\n", stp, err);
215 static void dbgp_disconnect(struct usb_gadget *gadget)
217 #ifdef CONFIG_USB_G_DBGP_PRINTK
220 gserial_disconnect(dbgp.serial);
224 static void dbgp_unbind(struct usb_gadget *gadget)
226 #ifdef CONFIG_USB_G_DBGP_SERIAL
230 kfree(dbgp.req->buf);
231 usb_ep_free_request(gadget->ep0, dbgp.req);
234 gadget->ep0->driver_data = NULL;
237 static int __init dbgp_configure_endpoints(struct usb_gadget *gadget)
241 usb_ep_autoconfig_reset(gadget);
243 dbgp.i_ep = usb_ep_autoconfig(gadget, &i_desc);
249 dbgp.i_ep->driver_data = gadget;
250 i_desc.wMaxPacketSize =
251 __constant_cpu_to_le16(USB_DEBUG_MAX_PACKET_SIZE);
253 dbgp.o_ep = usb_ep_autoconfig(gadget, &o_desc);
255 dbgp.i_ep->driver_data = NULL;
260 dbgp.o_ep->driver_data = gadget;
261 o_desc.wMaxPacketSize =
262 __constant_cpu_to_le16(USB_DEBUG_MAX_PACKET_SIZE);
264 dbg_desc.bDebugInEndpoint = i_desc.bEndpointAddress & 0x7f;
265 dbg_desc.bDebugOutEndpoint = o_desc.bEndpointAddress & 0x7f;
267 #ifdef CONFIG_USB_G_DBGP_SERIAL
268 dbgp.serial->in = dbgp.i_ep;
269 dbgp.serial->out = dbgp.o_ep;
271 dbgp.serial->in_desc = &i_desc;
272 dbgp.serial->out_desc = &o_desc;
274 if (gserial_setup(gadget, 1) < 0) {
282 dbgp.o_ep->driver_data = NULL;
287 dbgp.i_ep->driver_data = NULL;
289 dev_dbg(&dbgp.gadget->dev, "ep config: failure (%d)\n", stp);
293 static int __init dbgp_bind(struct usb_gadget *gadget)
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);
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;
367 dev_dbg(&dbgp.gadget->dev, "setup: desc debug\n");
368 len = sizeof dbg_desc;
374 } else if (request == USB_REQ_SET_FEATURE &&
375 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);
390 req->length = min(length, len);
391 req->zero = len < req->length;
392 if (data && req->length)
393 memcpy(req->buf, data, req->length);
395 req->complete = dbgp_setup_complete;
396 return usb_ep_queue(gadget->ep0, req, GFP_ATOMIC);
400 dev_dbg(&dbgp.gadget->dev,
401 "setup: failure req %x v %x\n", request, value);
405 static struct usb_gadget_driver dbgp_driver = {
407 .speed = USB_SPEED_HIGH,
409 .unbind = dbgp_unbind,
411 .disconnect = dbgp_disconnect,
413 .owner = THIS_MODULE,
418 static int __init dbgp_init(void)
420 return usb_gadget_register_driver(&dbgp_driver);
423 static void __exit dbgp_exit(void)
425 usb_gadget_unregister_driver(&dbgp_driver);
426 #ifdef CONFIG_USB_G_DBGP_SERIAL
431 MODULE_AUTHOR("Stephane Duverger");
432 MODULE_LICENSE("GPL");
433 module_init(dbgp_init);
434 module_exit(dbgp_exit);