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>
18 #define DRIVER_VENDOR_ID 0x0525 /* NetChip */
19 #define DRIVER_PRODUCT_ID 0xc0de /* undefined */
21 #define USB_DEBUG_MAX_PACKET_SIZE 8
22 #define DBGP_REQ_EP0_LEN 128
23 #define DBGP_REQ_LEN 512
26 struct usb_gadget *gadget;
27 struct usb_request *req;
30 #ifdef CONFIG_USB_G_DBGP_SERIAL
31 struct gserial *serial;
35 static struct usb_device_descriptor device_desc = {
36 .bLength = sizeof device_desc,
37 .bDescriptorType = USB_DT_DEVICE,
38 .bcdUSB = cpu_to_le16(0x0200),
39 .bDeviceClass = USB_CLASS_VENDOR_SPEC,
40 .idVendor = cpu_to_le16(DRIVER_VENDOR_ID),
41 .idProduct = cpu_to_le16(DRIVER_PRODUCT_ID),
42 .bNumConfigurations = 1,
45 static struct usb_debug_descriptor dbg_desc = {
46 .bLength = sizeof dbg_desc,
47 .bDescriptorType = USB_DT_DEBUG,
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,
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,
64 #ifdef CONFIG_USB_G_DBGP_PRINTK
65 static int dbgp_consume(char *buf, unsigned len)
76 printk(KERN_NOTICE "%s%c", buf, c);
80 static void __disable_ep(struct usb_ep *ep)
82 if (ep && ep->driver_data == dbgp.gadget) {
84 ep->driver_data = NULL;
88 static void dbgp_disable_ep(void)
90 __disable_ep(dbgp.i_ep);
91 __disable_ep(dbgp.o_ep);
94 static void dbgp_complete(struct usb_ep *ep, struct usb_request *req)
98 int status = req->status;
100 if (ep == dbgp.i_ep) {
110 dbgp_consume(req->buf, req->actual);
112 req->length = DBGP_REQ_LEN;
113 err = usb_ep_queue(ep, req, GFP_ATOMIC);
123 usb_ep_free_request(dbgp.o_ep, req);
126 dev_dbg(&dbgp.gadget->dev,
127 "complete: failure (%d:%d) ==> %d\n", stp, err, status);
130 static int dbgp_enable_ep_req(struct usb_ep *ep)
133 struct usb_request *req;
135 req = usb_ep_alloc_request(ep, GFP_KERNEL);
142 req->buf = kmalloc(DBGP_REQ_LEN, GFP_KERNEL);
149 req->complete = dbgp_complete;
150 req->length = DBGP_REQ_LEN;
151 err = usb_ep_queue(ep, req, GFP_ATOMIC);
162 usb_ep_free_request(dbgp.o_ep, req);
164 dev_dbg(&dbgp.gadget->dev,
165 "enable ep req: failure (%d:%d)\n", stp, err);
169 static int __enable_ep(struct usb_ep *ep, struct usb_endpoint_descriptor *desc)
173 err = usb_ep_enable(ep);
174 ep->driver_data = dbgp.gadget;
178 static int dbgp_enable_ep(void)
182 err = __enable_ep(dbgp.i_ep, &i_desc);
188 err = __enable_ep(dbgp.o_ep, &o_desc);
194 err = dbgp_enable_ep_req(dbgp.o_ep);
203 __disable_ep(dbgp.o_ep);
205 __disable_ep(dbgp.i_ep);
207 dev_dbg(&dbgp.gadget->dev, "enable ep: failure (%d:%d)\n", stp, err);
212 static void dbgp_disconnect(struct usb_gadget *gadget)
214 #ifdef CONFIG_USB_G_DBGP_PRINTK
217 gserial_disconnect(dbgp.serial);
221 static void dbgp_unbind(struct usb_gadget *gadget)
223 #ifdef CONFIG_USB_G_DBGP_SERIAL
228 kfree(dbgp.req->buf);
229 usb_ep_free_request(gadget->ep0, dbgp.req);
233 gadget->ep0->driver_data = NULL;
236 #ifdef CONFIG_USB_G_DBGP_SERIAL
237 static unsigned char tty_line;
240 static int dbgp_configure_endpoints(struct usb_gadget *gadget)
244 usb_ep_autoconfig_reset(gadget);
246 dbgp.i_ep = usb_ep_autoconfig(gadget, &i_desc);
252 dbgp.i_ep->driver_data = gadget;
253 i_desc.wMaxPacketSize =
254 cpu_to_le16(USB_DEBUG_MAX_PACKET_SIZE);
256 dbgp.o_ep = usb_ep_autoconfig(gadget, &o_desc);
258 dbgp.i_ep->driver_data = NULL;
263 dbgp.o_ep->driver_data = gadget;
264 o_desc.wMaxPacketSize =
265 cpu_to_le16(USB_DEBUG_MAX_PACKET_SIZE);
267 dbg_desc.bDebugInEndpoint = i_desc.bEndpointAddress;
268 dbg_desc.bDebugOutEndpoint = o_desc.bEndpointAddress;
270 #ifdef CONFIG_USB_G_DBGP_SERIAL
271 dbgp.serial->in = dbgp.i_ep;
272 dbgp.serial->out = dbgp.o_ep;
274 dbgp.serial->in->desc = &i_desc;
275 dbgp.serial->out->desc = &o_desc;
281 dbgp.i_ep->driver_data = NULL;
283 dev_dbg(&dbgp.gadget->dev, "ep config: failure (%d)\n", stp);
287 static int dbgp_bind(struct usb_gadget *gadget,
288 struct usb_gadget_driver *driver)
292 dbgp.gadget = gadget;
294 dbgp.req = usb_ep_alloc_request(gadget->ep0, GFP_KERNEL);
301 dbgp.req->buf = kmalloc(DBGP_REQ_EP0_LEN, GFP_KERNEL);
302 if (!dbgp.req->buf) {
308 dbgp.req->length = DBGP_REQ_EP0_LEN;
309 gadget->ep0->driver_data = gadget;
311 #ifdef CONFIG_USB_G_DBGP_SERIAL
312 dbgp.serial = kzalloc(sizeof(struct gserial), GFP_KERNEL);
319 if (gserial_alloc_line(&tty_line)) {
326 err = dbgp_configure_endpoints(gadget);
332 dev_dbg(&dbgp.gadget->dev, "bind: success\n");
336 dev_dbg(&gadget->dev, "bind: failure (%d:%d)\n", stp, err);
341 static void dbgp_setup_complete(struct usb_ep *ep,
342 struct usb_request *req)
344 dev_dbg(&dbgp.gadget->dev, "setup complete: %d, %d/%d\n",
345 req->status, req->actual, req->length);
348 static int dbgp_setup(struct usb_gadget *gadget,
349 const struct usb_ctrlrequest *ctrl)
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;
359 gadget->ep0->driver_data = gadget;
361 if (request == USB_REQ_GET_DESCRIPTOR) {
364 dev_dbg(&dbgp.gadget->dev, "setup: desc device\n");
365 len = sizeof device_desc;
367 device_desc.bMaxPacketSize0 = gadget->ep0->maxpacket;
370 dev_dbg(&dbgp.gadget->dev, "setup: desc debug\n");
371 len = sizeof dbg_desc;
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();
384 err = dbgp_configure_endpoints(gadget);
388 err = gserial_connect(dbgp.serial, tty_line);
395 req->length = min(length, len);
396 req->zero = len < req->length;
397 if (data && req->length)
398 memcpy(req->buf, data, req->length);
400 req->complete = dbgp_setup_complete;
401 return usb_ep_queue(gadget->ep0, req, GFP_ATOMIC);
404 dev_dbg(&dbgp.gadget->dev,
405 "setup: failure req %x v %x\n", request, value);
409 static struct usb_gadget_driver dbgp_driver = {
411 .max_speed = USB_SPEED_HIGH,
413 .unbind = dbgp_unbind,
415 .reset = dbgp_disconnect,
416 .disconnect = dbgp_disconnect,
418 .owner = THIS_MODULE,
423 static int __init dbgp_init(void)
425 return usb_gadget_probe_driver(&dbgp_driver);
428 static void __exit dbgp_exit(void)
430 usb_gadget_unregister_driver(&dbgp_driver);
431 #ifdef CONFIG_USB_G_DBGP_SERIAL
432 gserial_free_line(tty_line);
436 MODULE_AUTHOR("Stephane Duverger");
437 MODULE_LICENSE("GPL");
438 module_init(dbgp_init);
439 module_exit(dbgp_exit);