[deliverable/linux.git] / drivers / usb / gadget / dbgp.c

/*
 * dbgp.c -- EHCI Debug Port device gadget
 *
 * Copyright (C) 2010 Stephane Duverger
 *
 * Released under the GPLv2.
 */

/* verbose messages */
#include <linux/kernel.h>
#include <linux/device.h>
#include <linux/usb/ch9.h>
#include <linux/usb/gadget.h>

/* See comments in "zero.c" */
#include "epautoconf.c"

#ifdef CONFIG_USB_G_DBGP_SERIAL
#include "u_serial.c"
#endif

#define DRIVER_VENDOR_ID	0x0525 /* NetChip */
#define DRIVER_PRODUCT_ID	0xc0de /* undefined */

#define USB_DEBUG_MAX_PACKET_SIZE     8
#define DBGP_REQ_EP0_LEN              128
#define DBGP_REQ_LEN                  512

static struct dbgp {
	struct usb_gadget  *gadget;
	struct usb_request *req;
	struct usb_ep      *i_ep;
	struct usb_ep      *o_ep;
#ifdef CONFIG_USB_G_DBGP_SERIAL
	struct gserial     *serial;
#endif
} dbgp;

static struct usb_device_descriptor device_desc = {
	.bLength = sizeof device_desc,
	.bDescriptorType = USB_DT_DEVICE,
	.bcdUSB = __constant_cpu_to_le16(0x0200),
	.bDeviceClass =	USB_CLASS_VENDOR_SPEC,
	.idVendor = __constant_cpu_to_le16(DRIVER_VENDOR_ID),
	.idProduct = __constant_cpu_to_le16(DRIVER_PRODUCT_ID),
	.bNumConfigurations = 1,
};

static struct usb_debug_descriptor dbg_desc = {
	.bLength = sizeof dbg_desc,
	.bDescriptorType = USB_DT_DEBUG,
};

static struct usb_endpoint_descriptor i_desc = {
	.bLength = USB_DT_ENDPOINT_SIZE,
	.bDescriptorType = USB_DT_ENDPOINT,
	.bmAttributes = USB_ENDPOINT_XFER_BULK,
	.bEndpointAddress = USB_DIR_IN,
};

static struct usb_endpoint_descriptor o_desc = {
	.bLength = USB_DT_ENDPOINT_SIZE,
	.bDescriptorType = USB_DT_ENDPOINT,
	.bmAttributes = USB_ENDPOINT_XFER_BULK,
	.bEndpointAddress = USB_DIR_OUT,
};

#ifdef CONFIG_USB_G_DBGP_PRINTK
static int dbgp_consume(char *buf, unsigned len)
{
	char c;

	if (!len)
		return 0;

	c = buf[len-1];
	if (c != 0)
		buf[len-1] = 0;

	printk(KERN_NOTICE "%s%c", buf, c);
	return 0;
}

static void __disable_ep(struct usb_ep *ep)
{
	if (ep && ep->driver_data == dbgp.gadget) {
		usb_ep_disable(ep);
		ep->driver_data = NULL;
	}
}

static void dbgp_disable_ep(void)
{
	__disable_ep(dbgp.i_ep);
	__disable_ep(dbgp.o_ep);
}

static void dbgp_complete(struct usb_ep *ep, struct usb_request *req)
{
	int stp;
	int err = 0;
	int status = req->status;

	if (ep == dbgp.i_ep) {
		stp = 1;
		goto fail;
	}

	if (status != 0) {
		stp = 2;
		goto release_req;
	}

	dbgp_consume(req->buf, req->actual);

	req->length = DBGP_REQ_LEN;
	err = usb_ep_queue(ep, req, GFP_ATOMIC);
	if (err < 0) {
		stp = 3;
		goto release_req;
	}

	return;

release_req:
	kfree(req->buf);
	usb_ep_free_request(dbgp.o_ep, req);
	dbgp_disable_ep();
fail:
	dev_dbg(&dbgp.gadget->dev,
		"complete: failure (%d:%d) ==> %d\n", stp, err, status);
}

static int dbgp_enable_ep_req(struct usb_ep *ep)
{
	int err, stp;
	struct usb_request *req;

	req = usb_ep_alloc_request(ep, GFP_KERNEL);
	if (!req) {
		err = -ENOMEM;
		stp = 1;
		goto fail_1;
	}

	req->buf = kmalloc(DBGP_REQ_LEN, GFP_KERNEL);
	if (!req->buf) {
		err = -ENOMEM;
		stp = 2;
		goto fail_2;
	}

	req->complete = dbgp_complete;
	req->length = DBGP_REQ_LEN;
	err = usb_ep_queue(ep, req, GFP_ATOMIC);
	if (err < 0) {
		stp = 3;
		goto fail_3;
	}

	return 0;

fail_3:
	kfree(req->buf);
fail_2:
	usb_ep_free_request(dbgp.o_ep, req);
fail_1:
	dev_dbg(&dbgp.gadget->dev,
		"enable ep req: failure (%d:%d)\n", stp, err);
	return err;
}

static int __enable_ep(struct usb_ep *ep, struct usb_endpoint_descriptor *desc)
{
	int err;
	ep->desc = desc;
	err = usb_ep_enable(ep);
	ep->driver_data = dbgp.gadget;
	return err;
}

static int dbgp_enable_ep(void)
{
	int err, stp;

	err = __enable_ep(dbgp.i_ep, &i_desc);
	if (err < 0) {
		stp = 1;
		goto fail_1;
	}

	err = __enable_ep(dbgp.o_ep, &o_desc);
	if (err < 0) {
		stp = 2;
		goto fail_2;
	}

	err = dbgp_enable_ep_req(dbgp.o_ep);
	if (err < 0) {
		stp = 3;
		goto fail_3;
	}

	return 0;

fail_3:
	__disable_ep(dbgp.o_ep);
fail_2:
	__disable_ep(dbgp.i_ep);
fail_1:
	dev_dbg(&dbgp.gadget->dev, "enable ep: failure (%d:%d)\n", stp, err);
	return err;
}
#endif

static void dbgp_disconnect(struct usb_gadget *gadget)
{
#ifdef CONFIG_USB_G_DBGP_PRINTK
	dbgp_disable_ep();
#else
	gserial_disconnect(dbgp.serial);
#endif
}

static void dbgp_unbind(struct usb_gadget *gadget)
{
#ifdef CONFIG_USB_G_DBGP_SERIAL
	kfree(dbgp.serial);
#endif
	if (dbgp.req) {
		kfree(dbgp.req->buf);
		usb_ep_free_request(gadget->ep0, dbgp.req);
	}

	gadget->ep0->driver_data = NULL;
}

static int __init dbgp_configure_endpoints(struct usb_gadget *gadget)
{
	int stp;

	usb_ep_autoconfig_reset(gadget);

	dbgp.i_ep = usb_ep_autoconfig(gadget, &i_desc);
	if (!dbgp.i_ep) {
		stp = 1;
		goto fail_1;
	}

	dbgp.i_ep->driver_data = gadget;
	i_desc.wMaxPacketSize =
		__constant_cpu_to_le16(USB_DEBUG_MAX_PACKET_SIZE);

	dbgp.o_ep = usb_ep_autoconfig(gadget, &o_desc);
	if (!dbgp.o_ep) {
		dbgp.i_ep->driver_data = NULL;
		stp = 2;
		goto fail_2;
	}

	dbgp.o_ep->driver_data = gadget;
	o_desc.wMaxPacketSize =
		__constant_cpu_to_le16(USB_DEBUG_MAX_PACKET_SIZE);

	dbg_desc.bDebugInEndpoint = i_desc.bEndpointAddress;
	dbg_desc.bDebugOutEndpoint = o_desc.bEndpointAddress;

#ifdef CONFIG_USB_G_DBGP_SERIAL
	dbgp.serial->in = dbgp.i_ep;
	dbgp.serial->out = dbgp.o_ep;

	dbgp.serial->in->desc = &i_desc;
	dbgp.serial->out->desc = &o_desc;

	if (gserial_setup(gadget, 1) < 0) {
		stp = 3;
		goto fail_3;
	}

	return 0;

fail_3:
	dbgp.o_ep->driver_data = NULL;
#else
	return 0;
#endif
fail_2:
	dbgp.i_ep->driver_data = NULL;
fail_1:
	dev_dbg(&dbgp.gadget->dev, "ep config: failure (%d)\n", stp);
	return -ENODEV;
}

static int __init dbgp_bind(struct usb_gadget *gadget)
{
	int err, stp;

	dbgp.gadget = gadget;

	dbgp.req = usb_ep_alloc_request(gadget->ep0, GFP_KERNEL);
	if (!dbgp.req) {
		err = -ENOMEM;
		stp = 1;
		goto fail;
	}

	dbgp.req->buf = kmalloc(DBGP_REQ_EP0_LEN, GFP_KERNEL);
	if (!dbgp.req->buf) {
		err = -ENOMEM;
		stp = 2;
		goto fail;
	}

	dbgp.req->length = DBGP_REQ_EP0_LEN;
	gadget->ep0->driver_data = gadget;

#ifdef CONFIG_USB_G_DBGP_SERIAL
	dbgp.serial = kzalloc(sizeof(struct gserial), GFP_KERNEL);
	if (!dbgp.serial) {
		stp = 3;
		err = -ENOMEM;
		goto fail;
	}
#endif
	err = dbgp_configure_endpoints(gadget);
	if (err < 0) {
		stp = 4;
		goto fail;
	}

	dev_dbg(&dbgp.gadget->dev, "bind: success\n");
	return 0;

fail:
	dev_dbg(&gadget->dev, "bind: failure (%d:%d)\n", stp, err);
	dbgp_unbind(gadget);
	return err;
}

static void dbgp_setup_complete(struct usb_ep *ep,
				struct usb_request *req)
{
	dev_dbg(&dbgp.gadget->dev, "setup complete: %d, %d/%d\n",
		req->status, req->actual, req->length);
}

static int dbgp_setup(struct usb_gadget *gadget,
		      const struct usb_ctrlrequest *ctrl)
{
	struct usb_request *req = dbgp.req;
	u8 request = ctrl->bRequest;
	u16 value = le16_to_cpu(ctrl->wValue);
	u16 length = le16_to_cpu(ctrl->wLength);
	int err = -EOPNOTSUPP;
	void *data = NULL;
	u16 len = 0;

	gadget->ep0->driver_data = gadget;

	if (request == USB_REQ_GET_DESCRIPTOR) {
		switch (value>>8) {
		case USB_DT_DEVICE:
			dev_dbg(&dbgp.gadget->dev, "setup: desc device\n");
			len = sizeof device_desc;
			data = &device_desc;
			device_desc.bMaxPacketSize0 = gadget->ep0->maxpacket;
			break;
		case USB_DT_DEBUG:
			dev_dbg(&dbgp.gadget->dev, "setup: desc debug\n");
			len = sizeof dbg_desc;
			data = &dbg_desc;
			break;
		default:
			goto fail;
		}
		err = 0;
	} else if (request == USB_REQ_SET_FEATURE &&
		   value == USB_DEVICE_DEBUG_MODE) {
		dev_dbg(&dbgp.gadget->dev, "setup: feat debug\n");
#ifdef CONFIG_USB_G_DBGP_PRINTK
		err = dbgp_enable_ep();
#else
		err = gserial_connect(dbgp.serial, 0);
#endif
		if (err < 0)
			goto fail;
	} else
		goto fail;

	req->length = min(length, len);
	req->zero = len < req->length;
	if (data && req->length)
		memcpy(req->buf, data, req->length);

	req->complete = dbgp_setup_complete;
	return usb_ep_queue(gadget->ep0, req, GFP_ATOMIC);

fail:
	dev_dbg(&dbgp.gadget->dev,
		"setup: failure req %x v %x\n", request, value);
	return err;
}

static struct usb_gadget_driver dbgp_driver = {
	.function = "dbgp",
	.speed = USB_SPEED_HIGH,
	.unbind = dbgp_unbind,
	.setup = dbgp_setup,
	.disconnect = dbgp_disconnect,
	.driver	= {
		.owner = THIS_MODULE,
		.name = "dbgp"
	},
};

static int __init dbgp_init(void)
{
	return usb_gadget_probe_driver(&dbgp_driver, dbgp_bind);
}

static void __exit dbgp_exit(void)
{
	usb_gadget_unregister_driver(&dbgp_driver);
#ifdef CONFIG_USB_G_DBGP_SERIAL
	gserial_cleanup();
#endif
}

MODULE_AUTHOR("Stephane Duverger");
MODULE_LICENSE("GPL");
module_init(dbgp_init);
module_exit(dbgp_exit);
Commit	Line	Data
f6c826a9	1	/*
	2	* dbgp.c -- EHCI Debug Port device gadget
	3	*
	4	* Copyright (C) 2010 Stephane Duverger
	5	*
	6	* Released under the GPLv2.
f6c826a9	7	*/
	8
	9	/* verbose messages */
	10	#include <linux/kernel.h>
	11	#include <linux/device.h>
	12	#include <linux/usb/ch9.h>
	13	#include <linux/usb/gadget.h>
	14
	15	/* See comments in "zero.c" */
	16	#include "epautoconf.c"
	17
	18	#ifdef CONFIG_USB_G_DBGP_SERIAL
	19	#include "u_serial.c"
	20	#endif
	21
	22	#define DRIVER_VENDOR_ID 0x0525 /* NetChip */
	23	#define DRIVER_PRODUCT_ID 0xc0de /* undefined */
	24
	25	#define USB_DEBUG_MAX_PACKET_SIZE 8
	26	#define DBGP_REQ_EP0_LEN 128
	27	#define DBGP_REQ_LEN 512
	28
	29	static struct dbgp {
	30	struct usb_gadget *gadget;
	31	struct usb_request *req;
	32	struct usb_ep *i_ep;
	33	struct usb_ep *o_ep;
	34	#ifdef CONFIG_USB_G_DBGP_SERIAL
	35	struct gserial *serial;
	36	#endif
	37	} dbgp;
	38
	39	static struct usb_device_descriptor device_desc = {
	40	.bLength = sizeof device_desc,
	41	.bDescriptorType = USB_DT_DEVICE,
	42	.bcdUSB = __constant_cpu_to_le16(0x0200),
	43	.bDeviceClass = USB_CLASS_VENDOR_SPEC,
	44	.idVendor = __constant_cpu_to_le16(DRIVER_VENDOR_ID),
	45	.idProduct = __constant_cpu_to_le16(DRIVER_PRODUCT_ID),
	46	.bNumConfigurations = 1,
	47	};
	48
	49	static struct usb_debug_descriptor dbg_desc = {
	50	.bLength = sizeof dbg_desc,
	51	.bDescriptorType = USB_DT_DEBUG,
	52	};
	53
	54	static struct usb_endpoint_descriptor i_desc = {
	55	.bLength = USB_DT_ENDPOINT_SIZE,
	56	.bDescriptorType = USB_DT_ENDPOINT,
	57	.bmAttributes = USB_ENDPOINT_XFER_BULK,
	58	.bEndpointAddress = USB_DIR_IN,
	59	};
	60
	61	static struct usb_endpoint_descriptor o_desc = {
	62	.bLength = USB_DT_ENDPOINT_SIZE,
	63	.bDescriptorType = USB_DT_ENDPOINT,
	64	.bmAttributes = USB_ENDPOINT_XFER_BULK,
	65	.bEndpointAddress = USB_DIR_OUT,
	66	};
	67
	68	#ifdef CONFIG_USB_G_DBGP_PRINTK
	69	static int dbgp_consume(char *buf, unsigned len)
	70	{
71	char c;
72
73	if (!len)
74	return 0;
75
76	c = buf[len-1];
77	if (c != 0)
78	buf[len-1] = 0;
79
80	printk(KERN_NOTICE "%s%c", buf, c);
81	return 0;
82	}
83
84	static void __disable_ep(struct usb_ep *ep)
85	{
86	if (ep && ep->driver_data == dbgp.gadget) {
87	usb_ep_disable(ep);
88	ep->driver_data = NULL;
89	}
90	}
91
92	static void dbgp_disable_ep(void)
93	{
94	__disable_ep(dbgp.i_ep);
95	__disable_ep(dbgp.o_ep);
96	}
97
98	static void dbgp_complete(struct usb_ep ep, struct usb_request req)
99	{
100	int stp;
101	int err = 0;
102	int status = req->status;
103
104	if (ep == dbgp.i_ep) {
105	stp = 1;
106	goto fail;
107	}
108
109	if (status != 0) {
110	stp = 2;
111	goto release_req;
112	}
113
114	dbgp_consume(req->buf, req->actual);
115
116	req->length = DBGP_REQ_LEN;
117	err = usb_ep_queue(ep, req, GFP_ATOMIC);
118	if (err < 0) {
119	stp = 3;
120	goto release_req;
121	}
122
123	return;
124
125	release_req:
126	kfree(req->buf);
127	usb_ep_free_request(dbgp.o_ep, req);
128	dbgp_disable_ep();
129	fail:
130	dev_dbg(&dbgp.gadget->dev,
131	"complete: failure (%d:%d) ==> %d\n", stp, err, status);
132	}
133
134	static int dbgp_enable_ep_req(struct usb_ep *ep)
135	{
136	int err, stp;
137	struct usb_request *req;
138
139	req = usb_ep_alloc_request(ep, GFP_KERNEL);
140	if (!req) {
141	err = -ENOMEM;
142	stp = 1;
143	goto fail_1;
144	}
145
146	req->buf = kmalloc(DBGP_REQ_LEN, GFP_KERNEL);
147	if (!req->buf) {
148	err = -ENOMEM;
149	stp = 2;
150	goto fail_2;
151	}
152
153	req->complete = dbgp_complete;
154	req->length = DBGP_REQ_LEN;
155	err = usb_ep_queue(ep, req, GFP_ATOMIC);
156	if (err < 0) {
157	stp = 3;
158	goto fail_3;
159	}
160
161	return 0;
162
163	fail_3:
164	kfree(req->buf);
165	fail_2:
166	usb_ep_free_request(dbgp.o_ep, req);
167	fail_1:
168	dev_dbg(&dbgp.gadget->dev,
169	"enable ep req: failure (%d:%d)\n", stp, err);
170	return err;
171	}
172
173	static int __enable_ep(struct usb_ep ep, struct usb_endpoint_descriptor desc)
174	{
72c973dd TB	175	int err;
	176	ep->desc = desc;
	177	err = usb_ep_enable(ep);
f6c826a9	178	ep->driver_data = dbgp.gadget;
	179	return err;
	180	}
	181
	182	static int dbgp_enable_ep(void)
	183	{
	184	int err, stp;
	185
	186	err = __enable_ep(dbgp.i_ep, &i_desc);
	187	if (err < 0) {
	188	stp = 1;
	189	goto fail_1;
	190	}
	191
	192	err = __enable_ep(dbgp.o_ep, &o_desc);
	193	if (err < 0) {
	194	stp = 2;
	195	goto fail_2;
	196	}
	197
	198	err = dbgp_enable_ep_req(dbgp.o_ep);
	199	if (err < 0) {
	200	stp = 3;
	201	goto fail_3;
	202	}
	203
	204	return 0;
	205
	206	fail_3:
	207	__disable_ep(dbgp.o_ep);
	208	fail_2:
	209	__disable_ep(dbgp.i_ep);
	210	fail_1:
	211	dev_dbg(&dbgp.gadget->dev, "enable ep: failure (%d:%d)\n", stp, err);
	212	return err;
	213	}
	214	#endif
	215
	216	static void dbgp_disconnect(struct usb_gadget *gadget)
	217	{
	218	#ifdef CONFIG_USB_G_DBGP_PRINTK
	219	dbgp_disable_ep();
	220	#else
	221	gserial_disconnect(dbgp.serial);
	222	#endif
	223	}
	224
	225	static void dbgp_unbind(struct usb_gadget *gadget)
	226	{
	227	#ifdef CONFIG_USB_G_DBGP_SERIAL
	228	kfree(dbgp.serial);
	229	#endif
	230	if (dbgp.req) {
	231	kfree(dbgp.req->buf);
	232	usb_ep_free_request(gadget->ep0, dbgp.req);
	233	}
	234
	235	gadget->ep0->driver_data = NULL;
	236	}
	237
	238	static int __init dbgp_configure_endpoints(struct usb_gadget *gadget)
	239	{
	240	int stp;
	241
242	usb_ep_autoconfig_reset(gadget);
243
244	dbgp.i_ep = usb_ep_autoconfig(gadget, &i_desc);
245	if (!dbgp.i_ep) {
246	stp = 1;
247	goto fail_1;
248	}
249
250	dbgp.i_ep->driver_data = gadget;
251	i_desc.wMaxPacketSize =
252	__constant_cpu_to_le16(USB_DEBUG_MAX_PACKET_SIZE);
253
254	dbgp.o_ep = usb_ep_autoconfig(gadget, &o_desc);
255	if (!dbgp.o_ep) {
256	dbgp.i_ep->driver_data = NULL;
257	stp = 2;
258	goto fail_2;
259	}
260
261	dbgp.o_ep->driver_data = gadget;
262	o_desc.wMaxPacketSize =
263	__constant_cpu_to_le16(USB_DEBUG_MAX_PACKET_SIZE);
264
a8779ee9 SS	265	dbg_desc.bDebugInEndpoint = i_desc.bEndpointAddress;
a8779ee9 SS	266	dbg_desc.bDebugOutEndpoint = o_desc.bEndpointAddress;
f6c826a9	267
	268	#ifdef CONFIG_USB_G_DBGP_SERIAL
	269	dbgp.serial->in = dbgp.i_ep;
	270	dbgp.serial->out = dbgp.o_ep;
	271
72c973dd TB	272	dbgp.serial->in->desc = &i_desc;
72c973dd TB	273	dbgp.serial->out->desc = &o_desc;
f6c826a9	274
	275	if (gserial_setup(gadget, 1) < 0) {
	276	stp = 3;
	277	goto fail_3;
	278	}
	279
	280	return 0;
	281
	282	fail_3:
	283	dbgp.o_ep->driver_data = NULL;
	284	#else
	285	return 0;
	286	#endif
	287	fail_2:
	288	dbgp.i_ep->driver_data = NULL;
	289	fail_1:
	290	dev_dbg(&dbgp.gadget->dev, "ep config: failure (%d)\n", stp);
	291	return -ENODEV;
	292	}
	293
	294	static int __init dbgp_bind(struct usb_gadget *gadget)
	295	{
	296	int err, stp;
	297
	298	dbgp.gadget = gadget;
	299
	300	dbgp.req = usb_ep_alloc_request(gadget->ep0, GFP_KERNEL);
	301	if (!dbgp.req) {
	302	err = -ENOMEM;
	303	stp = 1;
	304	goto fail;
	305	}
	306
	307	dbgp.req->buf = kmalloc(DBGP_REQ_EP0_LEN, GFP_KERNEL);
	308	if (!dbgp.req->buf) {
	309	err = -ENOMEM;
	310	stp = 2;
	311	goto fail;
	312	}
	313
	314	dbgp.req->length = DBGP_REQ_EP0_LEN;
	315	gadget->ep0->driver_data = gadget;
	316
	317	#ifdef CONFIG_USB_G_DBGP_SERIAL
	318	dbgp.serial = kzalloc(sizeof(struct gserial), GFP_KERNEL);
	319	if (!dbgp.serial) {
	320	stp = 3;
	321	err = -ENOMEM;
	322	goto fail;
	323	}
	324	#endif
	325	err = dbgp_configure_endpoints(gadget);
	326	if (err < 0) {
	327	stp = 4;
	328	goto fail;
	329	}
	330
	331	dev_dbg(&dbgp.gadget->dev, "bind: success\n");
	332	return 0;
	333
	334	fail:
	335	dev_dbg(&gadget->dev, "bind: failure (%d:%d)\n", stp, err);
	336	dbgp_unbind(gadget);
	337	return err;
338	}
339
340	static void dbgp_setup_complete(struct usb_ep *ep,
341	struct usb_request *req)
342	{
343	dev_dbg(&dbgp.gadget->dev, "setup complete: %d, %d/%d\n",
344	req->status, req->actual, req->length);
345	}
346
347	static int dbgp_setup(struct usb_gadget *gadget,
348	const struct usb_ctrlrequest *ctrl)
349	{
350	struct usb_request *req = dbgp.req;
351	u8 request = ctrl->bRequest;
352	u16 value = le16_to_cpu(ctrl->wValue);
353	u16 length = le16_to_cpu(ctrl->wLength);
1744020c SS	354	int err = -EOPNOTSUPP;
	355	void *data = NULL;
	356	u16 len = 0;
f6c826a9	357
	358	gadget->ep0->driver_data = gadget;
	359
	360	if (request == USB_REQ_GET_DESCRIPTOR) {
	361	switch (value>>8) {
	362	case USB_DT_DEVICE:
	363	dev_dbg(&dbgp.gadget->dev, "setup: desc device\n");
	364	len = sizeof device_desc;
	365	data = &device_desc;
765f5b83	366	device_desc.bMaxPacketSize0 = gadget->ep0->maxpacket;
f6c826a9	367	break;
	368	case USB_DT_DEBUG:
	369	dev_dbg(&dbgp.gadget->dev, "setup: desc debug\n");
	370	len = sizeof dbg_desc;
	371	data = &dbg_desc;
	372	break;
	373	default:
	374	goto fail;
	375	}
1744020c	376	err = 0;
f6c826a9	377	} else if (request == USB_REQ_SET_FEATURE &&
f6c826a9	378	value == USB_DEVICE_DEBUG_MODE) {
f6c826a9	379	dev_dbg(&dbgp.gadget->dev, "setup: feat debug\n");
	380	#ifdef CONFIG_USB_G_DBGP_PRINTK
	381	err = dbgp_enable_ep();
	382	#else
	383	err = gserial_connect(dbgp.serial, 0);
	384	#endif
	385	if (err < 0)
	386	goto fail;
	387	} else
	388	goto fail;
	389
c6a76781 DC	390	req->length = min(length, len);
	391	req->zero = len < req->length;
	392	if (data && req->length)
	393	memcpy(req->buf, data, req->length);
	394
	395	req->complete = dbgp_setup_complete;
	396	return usb_ep_queue(gadget->ep0, req, GFP_ATOMIC);
f6c826a9	397
	398	fail:
	399	dev_dbg(&dbgp.gadget->dev,
	400	"setup: failure req %x v %x\n", request, value);
	401	return err;
	402	}
	403
	404	static struct usb_gadget_driver dbgp_driver = {
	405	.function = "dbgp",
	406	.speed = USB_SPEED_HIGH,
f6c826a9	407	.unbind = dbgp_unbind,
	408	.setup = dbgp_setup,
	409	.disconnect = dbgp_disconnect,
	410	.driver = {
	411	.owner = THIS_MODULE,
	412	.name = "dbgp"
	413	},
	414	};
	415
	416	static int __init dbgp_init(void)
	417	{
b0fca50f	418	return usb_gadget_probe_driver(&dbgp_driver, dbgp_bind);
f6c826a9	419	}
	420
	421	static void __exit dbgp_exit(void)
	422	{
	423	usb_gadget_unregister_driver(&dbgp_driver);
	424	#ifdef CONFIG_USB_G_DBGP_SERIAL
	425	gserial_cleanup();
	426	#endif
	427	}
	428
	429	MODULE_AUTHOR("Stephane Duverger");
	430	MODULE_LICENSE("GPL");
	431	module_init(dbgp_init);
	432	module_exit(dbgp_exit);