[GitHub/mt8127/android_kernel_alcatel_ttab.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.
	7	*
	8	*/
	9
	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>
	15
	16	/* See comments in "zero.c" */
	17	#include "epautoconf.c"
	18
	19	#ifdef CONFIG_USB_G_DBGP_SERIAL
	20	#include "u_serial.c"
	21	#endif
	22
	23	#define DRIVER_VENDOR_ID 0x0525 /* NetChip */
	24	#define DRIVER_PRODUCT_ID 0xc0de /* undefined */
	25
	26	#define USB_DEBUG_MAX_PACKET_SIZE 8
	27	#define DBGP_REQ_EP0_LEN 128
	28	#define DBGP_REQ_LEN 512
	29
	30	static struct dbgp {
	31	struct usb_gadget *gadget;
	32	struct usb_request *req;
	33	struct usb_ep *i_ep;
	34	struct usb_ep *o_ep;
	35	#ifdef CONFIG_USB_G_DBGP_SERIAL
	36	struct gserial *serial;
	37	#endif
	38	} dbgp;
	39
	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,
	48	};
	49
	50	static struct usb_debug_descriptor dbg_desc = {
	51	.bLength = sizeof dbg_desc,
	52	.bDescriptorType = USB_DT_DEBUG,
	53	};
	54
	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,
	60	};
	61
	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,
67	};
68
69	#ifdef CONFIG_USB_G_DBGP_PRINTK
70	static int dbgp_consume(char *buf, unsigned len)
71	{
72	char c;
73
74	if (!len)
75	return 0;
76
77	c = buf[len-1];
78	if (c != 0)
79	buf[len-1] = 0;
80
81	printk(KERN_NOTICE "%s%c", buf, c);
82	return 0;
83	}
84
85	static void __disable_ep(struct usb_ep *ep)
86	{
87	if (ep && ep->driver_data == dbgp.gadget) {
88	usb_ep_disable(ep);
89	ep->driver_data = NULL;
90	}
91	}
92
93	static void dbgp_disable_ep(void)
94	{
95	__disable_ep(dbgp.i_ep);
96	__disable_ep(dbgp.o_ep);
97	}
98
99	static void dbgp_complete(struct usb_ep ep, struct usb_request req)
100	{
101	int stp;
102	int err = 0;
103	int status = req->status;
104
105	if (ep == dbgp.i_ep) {
106	stp = 1;
107	goto fail;
108	}
109
110	if (status != 0) {
111	stp = 2;
112	goto release_req;
113	}
114
115	dbgp_consume(req->buf, req->actual);
116
117	req->length = DBGP_REQ_LEN;
118	err = usb_ep_queue(ep, req, GFP_ATOMIC);
119	if (err < 0) {
120	stp = 3;
121	goto release_req;
122	}
123
124	return;
125
126	release_req:
127	kfree(req->buf);
128	usb_ep_free_request(dbgp.o_ep, req);
129	dbgp_disable_ep();
130	fail:
131	dev_dbg(&dbgp.gadget->dev,
132	"complete: failure (%d:%d) ==> %d\n", stp, err, status);
133	}
134
135	static int dbgp_enable_ep_req(struct usb_ep *ep)
136	{
137	int err, stp;
138	struct usb_request *req;
139
140	req = usb_ep_alloc_request(ep, GFP_KERNEL);
141	if (!req) {
142	err = -ENOMEM;
143	stp = 1;
144	goto fail_1;
145	}
146
147	req->buf = kmalloc(DBGP_REQ_LEN, GFP_KERNEL);
148	if (!req->buf) {
149	err = -ENOMEM;
150	stp = 2;
151	goto fail_2;
152	}
153
154	req->complete = dbgp_complete;
155	req->length = DBGP_REQ_LEN;
156	err = usb_ep_queue(ep, req, GFP_ATOMIC);
157	if (err < 0) {
158	stp = 3;
159	goto fail_3;
160	}
161
162	return 0;
163
164	fail_3:
165	kfree(req->buf);
166	fail_2:
167	usb_ep_free_request(dbgp.o_ep, req);
168	fail_1:
169	dev_dbg(&dbgp.gadget->dev,
170	"enable ep req: failure (%d:%d)\n", stp, err);
171	return err;
172	}
173
174	static int __enable_ep(struct usb_ep ep, struct usb_endpoint_descriptor desc)
175	{
72c973dd TB	176	int err;
	177	ep->desc = desc;
	178	err = usb_ep_enable(ep);
f6c826a9	179	ep->driver_data = dbgp.gadget;
	180	return err;
	181	}
	182
	183	static int dbgp_enable_ep(void)
	184	{
	185	int err, stp;
	186
	187	err = __enable_ep(dbgp.i_ep, &i_desc);
	188	if (err < 0) {
	189	stp = 1;
	190	goto fail_1;
	191	}
	192
	193	err = __enable_ep(dbgp.o_ep, &o_desc);
	194	if (err < 0) {
	195	stp = 2;
	196	goto fail_2;
	197	}
	198
	199	err = dbgp_enable_ep_req(dbgp.o_ep);
	200	if (err < 0) {
	201	stp = 3;
	202	goto fail_3;
	203	}
	204
	205	return 0;
	206
	207	fail_3:
	208	__disable_ep(dbgp.o_ep);
	209	fail_2:
	210	__disable_ep(dbgp.i_ep);
	211	fail_1:
	212	dev_dbg(&dbgp.gadget->dev, "enable ep: failure (%d:%d)\n", stp, err);
	213	return err;
	214	}
	215	#endif
	216
	217	static void dbgp_disconnect(struct usb_gadget *gadget)
	218	{
	219	#ifdef CONFIG_USB_G_DBGP_PRINTK
	220	dbgp_disable_ep();
	221	#else
	222	gserial_disconnect(dbgp.serial);
	223	#endif
	224	}
	225
	226	static void dbgp_unbind(struct usb_gadget *gadget)
	227	{
	228	#ifdef CONFIG_USB_G_DBGP_SERIAL
	229	kfree(dbgp.serial);
	230	#endif
	231	if (dbgp.req) {
	232	kfree(dbgp.req->buf);
	233	usb_ep_free_request(gadget->ep0, dbgp.req);
	234	}
	235
	236	gadget->ep0->driver_data = NULL;
	237	}
	238
	239	static int __init dbgp_configure_endpoints(struct usb_gadget *gadget)
	240	{
	241	int stp;
	242
243	usb_ep_autoconfig_reset(gadget);
244
245	dbgp.i_ep = usb_ep_autoconfig(gadget, &i_desc);
246	if (!dbgp.i_ep) {
247	stp = 1;
248	goto fail_1;
249	}
250
251	dbgp.i_ep->driver_data = gadget;
252	i_desc.wMaxPacketSize =
253	__constant_cpu_to_le16(USB_DEBUG_MAX_PACKET_SIZE);
254
255	dbgp.o_ep = usb_ep_autoconfig(gadget, &o_desc);
256	if (!dbgp.o_ep) {
257	dbgp.i_ep->driver_data = NULL;
258	stp = 2;
259	goto fail_2;
260	}
261
262	dbgp.o_ep->driver_data = gadget;
263	o_desc.wMaxPacketSize =
264	__constant_cpu_to_le16(USB_DEBUG_MAX_PACKET_SIZE);
265
a8779ee9 SS	266	dbg_desc.bDebugInEndpoint = i_desc.bEndpointAddress;
a8779ee9 SS	267	dbg_desc.bDebugOutEndpoint = o_desc.bEndpointAddress;
f6c826a9	268
	269	#ifdef CONFIG_USB_G_DBGP_SERIAL
	270	dbgp.serial->in = dbgp.i_ep;
	271	dbgp.serial->out = dbgp.o_ep;
	272
72c973dd TB	273	dbgp.serial->in->desc = &i_desc;
72c973dd TB	274	dbgp.serial->out->desc = &o_desc;
f6c826a9	275
	276	if (gserial_setup(gadget, 1) < 0) {
	277	stp = 3;
	278	goto fail_3;
	279	}
	280
	281	return 0;
	282
	283	fail_3:
	284	dbgp.o_ep->driver_data = NULL;
	285	#else
	286	return 0;
	287	#endif
	288	fail_2:
	289	dbgp.i_ep->driver_data = NULL;
	290	fail_1:
	291	dev_dbg(&dbgp.gadget->dev, "ep config: failure (%d)\n", stp);
	292	return -ENODEV;
	293	}
	294
	295	static int __init dbgp_bind(struct usb_gadget *gadget)
	296	{
	297	int err, stp;
	298
	299	dbgp.gadget = gadget;
	300
	301	dbgp.req = usb_ep_alloc_request(gadget->ep0, GFP_KERNEL);
	302	if (!dbgp.req) {
	303	err = -ENOMEM;
	304	stp = 1;
	305	goto fail;
	306	}
	307
	308	dbgp.req->buf = kmalloc(DBGP_REQ_EP0_LEN, GFP_KERNEL);
	309	if (!dbgp.req->buf) {
	310	err = -ENOMEM;
	311	stp = 2;
	312	goto fail;
	313	}
	314
	315	dbgp.req->length = DBGP_REQ_EP0_LEN;
	316	gadget->ep0->driver_data = gadget;
	317
	318	#ifdef CONFIG_USB_G_DBGP_SERIAL
	319	dbgp.serial = kzalloc(sizeof(struct gserial), GFP_KERNEL);
	320	if (!dbgp.serial) {
	321	stp = 3;
	322	err = -ENOMEM;
	323	goto fail;
	324	}
	325	#endif
	326	err = dbgp_configure_endpoints(gadget);
	327	if (err < 0) {
	328	stp = 4;
	329	goto fail;
	330	}
	331
	332	dev_dbg(&dbgp.gadget->dev, "bind: success\n");
	333	return 0;
	334
	335	fail:
	336	dev_dbg(&gadget->dev, "bind: failure (%d:%d)\n", stp, err);
	337	dbgp_unbind(gadget);
	338	return err;
339	}
340
341	static void dbgp_setup_complete(struct usb_ep *ep,
342	struct usb_request *req)
343	{
344	dev_dbg(&dbgp.gadget->dev, "setup complete: %d, %d/%d\n",
345	req->status, req->actual, req->length);
346	}
347
348	static int dbgp_setup(struct usb_gadget *gadget,
349	const struct usb_ctrlrequest *ctrl)
350	{
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);
1744020c SS	355	int err = -EOPNOTSUPP;
	356	void *data = NULL;
	357	u16 len = 0;
f6c826a9	358
	359	gadget->ep0->driver_data = gadget;
	360
	361	if (request == USB_REQ_GET_DESCRIPTOR) {
	362	switch (value>>8) {
	363	case USB_DT_DEVICE:
	364	dev_dbg(&dbgp.gadget->dev, "setup: desc device\n");
	365	len = sizeof device_desc;
	366	data = &device_desc;
765f5b83	367	device_desc.bMaxPacketSize0 = gadget->ep0->maxpacket;
f6c826a9	368	break;
	369	case USB_DT_DEBUG:
	370	dev_dbg(&dbgp.gadget->dev, "setup: desc debug\n");
	371	len = sizeof dbg_desc;
	372	data = &dbg_desc;
	373	break;
	374	default:
	375	goto fail;
	376	}
1744020c	377	err = 0;
f6c826a9	378	} else if (request == USB_REQ_SET_FEATURE &&
f6c826a9	379	value == USB_DEVICE_DEBUG_MODE) {
f6c826a9	380	dev_dbg(&dbgp.gadget->dev, "setup: feat debug\n");
	381	#ifdef CONFIG_USB_G_DBGP_PRINTK
	382	err = dbgp_enable_ep();
	383	#else
	384	err = gserial_connect(dbgp.serial, 0);
	385	#endif
	386	if (err < 0)
	387	goto fail;
	388	} else
	389	goto fail;
	390
c6a76781 DC	391	req->length = min(length, len);
	392	req->zero = len < req->length;
	393	if (data && req->length)
	394	memcpy(req->buf, data, req->length);
	395
	396	req->complete = dbgp_setup_complete;
	397	return usb_ep_queue(gadget->ep0, req, GFP_ATOMIC);
f6c826a9	398
	399	fail:
	400	dev_dbg(&dbgp.gadget->dev,
	401	"setup: failure req %x v %x\n", request, value);
	402	return err;
	403	}
	404
	405	static struct usb_gadget_driver dbgp_driver = {
	406	.function = "dbgp",
	407	.speed = USB_SPEED_HIGH,
f6c826a9	408	.unbind = dbgp_unbind,
	409	.setup = dbgp_setup,
	410	.disconnect = dbgp_disconnect,
	411	.driver = {
	412	.owner = THIS_MODULE,
	413	.name = "dbgp"
	414	},
	415	};
	416
	417	static int __init dbgp_init(void)
	418	{
b0fca50f	419	return usb_gadget_probe_driver(&dbgp_driver, dbgp_bind);
f6c826a9	420	}
	421
	422	static void __exit dbgp_exit(void)
	423	{
	424	usb_gadget_unregister_driver(&dbgp_driver);
	425	#ifdef CONFIG_USB_G_DBGP_SERIAL
	426	gserial_cleanup();
	427	#endif
	428	}
	429
	430	MODULE_AUTHOR("Stephane Duverger");
	431	MODULE_LICENSE("GPL");
	432	module_init(dbgp_init);
	433	module_exit(dbgp_exit);