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)
85 static void dbgp_disable_ep(void)
87 __disable_ep(dbgp.i_ep);
88 __disable_ep(dbgp.o_ep);
91 static void dbgp_complete(struct usb_ep *ep, struct usb_request *req)
95 int status = req->status;
97 if (ep == dbgp.i_ep) {
107 dbgp_consume(req->buf, req->actual);
109 req->length = DBGP_REQ_LEN;
110 err = usb_ep_queue(ep, req, GFP_ATOMIC);
120 usb_ep_free_request(dbgp.o_ep, req);
123 dev_dbg(&dbgp.gadget->dev,
124 "complete: failure (%d:%d) ==> %d\n", stp, err, status);
127 static int dbgp_enable_ep_req(struct usb_ep *ep)
130 struct usb_request *req;
132 req = usb_ep_alloc_request(ep, GFP_KERNEL);
139 req->buf = kmalloc(DBGP_REQ_LEN, GFP_KERNEL);
146 req->complete = dbgp_complete;
147 req->length = DBGP_REQ_LEN;
148 err = usb_ep_queue(ep, req, GFP_ATOMIC);
159 usb_ep_free_request(dbgp.o_ep, req);
161 dev_dbg(&dbgp.gadget->dev,
162 "enable ep req: failure (%d:%d)\n", stp, err);
166 static int __enable_ep(struct usb_ep *ep, struct usb_endpoint_descriptor *desc)
170 err = usb_ep_enable(ep);
174 static int dbgp_enable_ep(void)
178 err = __enable_ep(dbgp.i_ep, &i_desc);
184 err = __enable_ep(dbgp.o_ep, &o_desc);
190 err = dbgp_enable_ep_req(dbgp.o_ep);
199 __disable_ep(dbgp.o_ep);
201 __disable_ep(dbgp.i_ep);
203 dev_dbg(&dbgp.gadget->dev, "enable ep: failure (%d:%d)\n", stp, err);
208 static void dbgp_disconnect(struct usb_gadget *gadget)
210 #ifdef CONFIG_USB_G_DBGP_PRINTK
213 gserial_disconnect(dbgp.serial);
217 static void dbgp_unbind(struct usb_gadget *gadget)
219 #ifdef CONFIG_USB_G_DBGP_SERIAL
224 kfree(dbgp.req->buf);
225 usb_ep_free_request(gadget->ep0, dbgp.req);
230 #ifdef CONFIG_USB_G_DBGP_SERIAL
231 static unsigned char tty_line;
234 static int dbgp_configure_endpoints(struct usb_gadget *gadget)
238 usb_ep_autoconfig_reset(gadget);
240 dbgp.i_ep = usb_ep_autoconfig(gadget, &i_desc);
246 i_desc.wMaxPacketSize =
247 cpu_to_le16(USB_DEBUG_MAX_PACKET_SIZE);
249 dbgp.o_ep = usb_ep_autoconfig(gadget, &o_desc);
255 o_desc.wMaxPacketSize =
256 cpu_to_le16(USB_DEBUG_MAX_PACKET_SIZE);
258 dbg_desc.bDebugInEndpoint = i_desc.bEndpointAddress;
259 dbg_desc.bDebugOutEndpoint = o_desc.bEndpointAddress;
261 #ifdef CONFIG_USB_G_DBGP_SERIAL
262 dbgp.serial->in = dbgp.i_ep;
263 dbgp.serial->out = dbgp.o_ep;
265 dbgp.serial->in->desc = &i_desc;
266 dbgp.serial->out->desc = &o_desc;
272 dev_dbg(&dbgp.gadget->dev, "ep config: failure (%d)\n", stp);
276 static int dbgp_bind(struct usb_gadget *gadget,
277 struct usb_gadget_driver *driver)
281 dbgp.gadget = gadget;
283 dbgp.req = usb_ep_alloc_request(gadget->ep0, GFP_KERNEL);
290 dbgp.req->buf = kmalloc(DBGP_REQ_EP0_LEN, GFP_KERNEL);
291 if (!dbgp.req->buf) {
297 dbgp.req->length = DBGP_REQ_EP0_LEN;
299 #ifdef CONFIG_USB_G_DBGP_SERIAL
300 dbgp.serial = kzalloc(sizeof(struct gserial), GFP_KERNEL);
307 if (gserial_alloc_line(&tty_line)) {
314 err = dbgp_configure_endpoints(gadget);
320 dev_dbg(&dbgp.gadget->dev, "bind: success\n");
324 dev_dbg(&gadget->dev, "bind: failure (%d:%d)\n", stp, err);
329 static void dbgp_setup_complete(struct usb_ep *ep,
330 struct usb_request *req)
332 dev_dbg(&dbgp.gadget->dev, "setup complete: %d, %d/%d\n",
333 req->status, req->actual, req->length);
336 static int dbgp_setup(struct usb_gadget *gadget,
337 const struct usb_ctrlrequest *ctrl)
339 struct usb_request *req = dbgp.req;
340 u8 request = ctrl->bRequest;
341 u16 value = le16_to_cpu(ctrl->wValue);
342 u16 length = le16_to_cpu(ctrl->wLength);
343 int err = -EOPNOTSUPP;
347 if (request == USB_REQ_GET_DESCRIPTOR) {
350 dev_dbg(&dbgp.gadget->dev, "setup: desc device\n");
351 len = sizeof device_desc;
353 device_desc.bMaxPacketSize0 = gadget->ep0->maxpacket;
356 dev_dbg(&dbgp.gadget->dev, "setup: desc debug\n");
357 len = sizeof dbg_desc;
364 } else if (request == USB_REQ_SET_FEATURE &&
365 value == USB_DEVICE_DEBUG_MODE) {
366 dev_dbg(&dbgp.gadget->dev, "setup: feat debug\n");
367 #ifdef CONFIG_USB_G_DBGP_PRINTK
368 err = dbgp_enable_ep();
370 err = dbgp_configure_endpoints(gadget);
374 err = gserial_connect(dbgp.serial, tty_line);
381 req->length = min(length, len);
382 req->zero = len < req->length;
383 if (data && req->length)
384 memcpy(req->buf, data, req->length);
386 req->complete = dbgp_setup_complete;
387 return usb_ep_queue(gadget->ep0, req, GFP_ATOMIC);
390 dev_dbg(&dbgp.gadget->dev,
391 "setup: failure req %x v %x\n", request, value);
395 static struct usb_gadget_driver dbgp_driver = {
397 .max_speed = USB_SPEED_HIGH,
399 .unbind = dbgp_unbind,
401 .reset = dbgp_disconnect,
402 .disconnect = dbgp_disconnect,
404 .owner = THIS_MODULE,
409 static int __init dbgp_init(void)
411 return usb_gadget_probe_driver(&dbgp_driver);
414 static void __exit dbgp_exit(void)
416 usb_gadget_unregister_driver(&dbgp_driver);
417 #ifdef CONFIG_USB_G_DBGP_SERIAL
418 gserial_free_line(tty_line);
422 MODULE_AUTHOR("Stephane Duverger");
423 MODULE_LICENSE("GPL");
424 module_init(dbgp_init);
425 module_exit(dbgp_exit);