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 = __constant_cpu_to_le16(0x0200),
39 .bDeviceClass = USB_CLASS_VENDOR_SPEC,
40 .idVendor = __constant_cpu_to_le16(DRIVER_VENDOR_ID),
41 .idProduct = __constant_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
227 kfree(dbgp.req->buf);
228 usb_ep_free_request(gadget->ep0, dbgp.req);
231 gadget->ep0->driver_data = NULL;
234 #ifdef CONFIG_USB_G_DBGP_SERIAL
235 static unsigned char tty_line;
238 static int __init dbgp_configure_endpoints(struct usb_gadget *gadget)
242 usb_ep_autoconfig_reset(gadget);
244 dbgp.i_ep = usb_ep_autoconfig(gadget, &i_desc);
250 dbgp.i_ep->driver_data = gadget;
251 i_desc.wMaxPacketSize =
252 __constant_cpu_to_le16(USB_DEBUG_MAX_PACKET_SIZE);
254 dbgp.o_ep = usb_ep_autoconfig(gadget, &o_desc);
256 dbgp.i_ep->driver_data = NULL;
261 dbgp.o_ep->driver_data = gadget;
262 o_desc.wMaxPacketSize =
263 __constant_cpu_to_le16(USB_DEBUG_MAX_PACKET_SIZE);
265 dbg_desc.bDebugInEndpoint = i_desc.bEndpointAddress;
266 dbg_desc.bDebugOutEndpoint = o_desc.bEndpointAddress;
268 #ifdef CONFIG_USB_G_DBGP_SERIAL
269 dbgp.serial->in = dbgp.i_ep;
270 dbgp.serial->out = dbgp.o_ep;
272 dbgp.serial->in->desc = &i_desc;
273 dbgp.serial->out->desc = &o_desc;
275 if (gserial_alloc_line(&tty_line)) {
283 dbgp.o_ep->driver_data = NULL;
288 dbgp.i_ep->driver_data = NULL;
290 dev_dbg(&dbgp.gadget->dev, "ep config: failure (%d)\n", stp);
294 static int __init dbgp_bind(struct usb_gadget *gadget,
295 struct usb_gadget_driver *driver)
299 dbgp.gadget = gadget;
301 dbgp.req = usb_ep_alloc_request(gadget->ep0, GFP_KERNEL);
308 dbgp.req->buf = kmalloc(DBGP_REQ_EP0_LEN, GFP_KERNEL);
309 if (!dbgp.req->buf) {
315 dbgp.req->length = DBGP_REQ_EP0_LEN;
316 gadget->ep0->driver_data = gadget;
318 #ifdef CONFIG_USB_G_DBGP_SERIAL
319 dbgp.serial = kzalloc(sizeof(struct gserial), GFP_KERNEL);
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 = gserial_connect(dbgp.serial, tty_line);
391 req->length = min(length, len);
392 req->zero = len < req->length;
393 if (data && req->length)
394 memcpy(req->buf, data, req->length);
396 req->complete = dbgp_setup_complete;
397 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 __refdata struct usb_gadget_driver dbgp_driver = {
407 .max_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_probe_driver(&dbgp_driver);
423 static void __exit dbgp_exit(void)
425 usb_gadget_unregister_driver(&dbgp_driver);
426 #ifdef CONFIG_USB_G_DBGP_SERIAL
427 gserial_free_line(tty_line);
431 MODULE_AUTHOR("Stephane Duverger");
432 MODULE_LICENSE("GPL");
433 module_init(dbgp_init);
434 module_exit(dbgp_exit);