[linux-2.6-block.git] / drivers / usb / gadget / legacy / 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/module.h>
#include <linux/usb/ch9.h>
#include <linux/usb/gadget.h>

#include "u_serial.h"

#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 = cpu_to_le16(0x0200),
	.bDeviceClass =	USB_CLASS_VENDOR_SPEC,
	.idVendor = cpu_to_le16(DRIVER_VENDOR_ID),
	.idProduct = 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);
	dbgp.serial = NULL;
#endif
	if (dbgp.req) {
		kfree(dbgp.req->buf);
		usb_ep_free_request(gadget->ep0, dbgp.req);
		dbgp.req = NULL;
	}

	gadget->ep0->driver_data = NULL;
}

#ifdef CONFIG_USB_G_DBGP_SERIAL
static unsigned char tty_line;
#endif

static int 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 =
		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 =
		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;
#endif

	return 0;

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 dbgp_bind(struct usb_gadget *gadget,
		struct usb_gadget_driver *driver)
{
	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;
	}

	if (gserial_alloc_line(&tty_line)) {
		stp = 4;
		err = -ENODEV;
		goto fail;
	}
#endif

	err = dbgp_configure_endpoints(gadget);
	if (err < 0) {
		stp = 5;
		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 = dbgp_configure_endpoints(gadget);
		if (err < 0) {
			goto fail;
		}
		err = gserial_connect(dbgp.serial, tty_line);
#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",
	.max_speed = USB_SPEED_HIGH,
	.bind = dbgp_bind,
	.unbind = dbgp_unbind,
	.setup = dbgp_setup,
	.reset = dbgp_disconnect,
	.disconnect = dbgp_disconnect,
	.driver	= {
		.owner = THIS_MODULE,
		.name = "dbgp"
	},
};

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

static void __exit dbgp_exit(void)
{
	usb_gadget_unregister_driver(&dbgp_driver);
#ifdef CONFIG_USB_G_DBGP_SERIAL
	gserial_free_line(tty_line);
#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>
6eb0de82	12	#include <linux/module.h>
f6c826a9	13	#include <linux/usb/ch9.h>
	14	#include <linux/usb/gadget.h>
	15
3249ca22	16	#include "u_serial.h"
f6c826a9	17
	18	#define DRIVER_VENDOR_ID 0x0525 /* NetChip */
	19	#define DRIVER_PRODUCT_ID 0xc0de /* undefined */
	20
	21	#define USB_DEBUG_MAX_PACKET_SIZE 8
	22	#define DBGP_REQ_EP0_LEN 128
	23	#define DBGP_REQ_LEN 512
	24
	25	static struct dbgp {
	26	struct usb_gadget *gadget;
	27	struct usb_request *req;
	28	struct usb_ep *i_ep;
	29	struct usb_ep *o_ep;
	30	#ifdef CONFIG_USB_G_DBGP_SERIAL
	31	struct gserial *serial;
	32	#endif
	33	} dbgp;
	34
	35	static struct usb_device_descriptor device_desc = {
	36	.bLength = sizeof device_desc,
	37	.bDescriptorType = USB_DT_DEVICE,
b8464bcf	38	.bcdUSB = cpu_to_le16(0x0200),
f6c826a9	39	.bDeviceClass = USB_CLASS_VENDOR_SPEC,
b8464bcf VT	40	.idVendor = cpu_to_le16(DRIVER_VENDOR_ID),
b8464bcf VT	41	.idProduct = cpu_to_le16(DRIVER_PRODUCT_ID),
f6c826a9	42	.bNumConfigurations = 1,
	43	};
	44
	45	static struct usb_debug_descriptor dbg_desc = {
	46	.bLength = sizeof dbg_desc,
	47	.bDescriptorType = USB_DT_DEBUG,
	48	};
	49
	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,
	55	};
	56
	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,
	62	};
	63
	64	#ifdef CONFIG_USB_G_DBGP_PRINTK
	65	static int dbgp_consume(char *buf, unsigned len)
	66	{
	67	char c;
	68
	69	if (!len)
	70	return 0;
	71
	72	c = buf[len-1];
	73	if (c != 0)
	74	buf[len-1] = 0;
	75
	76	printk(KERN_NOTICE "%s%c", buf, c);
	77	return 0;
	78	}
	79
	80	static void __disable_ep(struct usb_ep *ep)
	81	{
	82	if (ep && ep->driver_data == dbgp.gadget) {
	83	usb_ep_disable(ep);
	84	ep->driver_data = NULL;
	85	}
	86	}
	87
	88	static void dbgp_disable_ep(void)
	89	{
	90	__disable_ep(dbgp.i_ep);
	91	__disable_ep(dbgp.o_ep);
	92	}
	93
	94	static void dbgp_complete(struct usb_ep ep, struct usb_request req)
	95	{
	96	int stp;
	97	int err = 0;
	98	int status = req->status;
	99
	100	if (ep == dbgp.i_ep) {
	101	stp = 1;
	102	goto fail;
	103	}
	104
	105	if (status != 0) {
106	stp = 2;
107	goto release_req;
108	}
109
110	dbgp_consume(req->buf, req->actual);
111
112	req->length = DBGP_REQ_LEN;
113	err = usb_ep_queue(ep, req, GFP_ATOMIC);
114	if (err < 0) {
115	stp = 3;
116	goto release_req;
117	}
118
119	return;
120
121	release_req:
122	kfree(req->buf);
123	usb_ep_free_request(dbgp.o_ep, req);
124	dbgp_disable_ep();
125	fail:
126	dev_dbg(&dbgp.gadget->dev,
127	"complete: failure (%d:%d) ==> %d\n", stp, err, status);
128	}
129
130	static int dbgp_enable_ep_req(struct usb_ep *ep)
131	{
132	int err, stp;
133	struct usb_request *req;
134
135	req = usb_ep_alloc_request(ep, GFP_KERNEL);
136	if (!req) {
137	err = -ENOMEM;
138	stp = 1;
139	goto fail_1;
140	}
141
142	req->buf = kmalloc(DBGP_REQ_LEN, GFP_KERNEL);
143	if (!req->buf) {
144	err = -ENOMEM;
145	stp = 2;
146	goto fail_2;
147	}
148
149	req->complete = dbgp_complete;
150	req->length = DBGP_REQ_LEN;
151	err = usb_ep_queue(ep, req, GFP_ATOMIC);
152	if (err < 0) {
153	stp = 3;
154	goto fail_3;
155	}
156
157	return 0;
158
159	fail_3:
160	kfree(req->buf);
161	fail_2:
162	usb_ep_free_request(dbgp.o_ep, req);
163	fail_1:
164	dev_dbg(&dbgp.gadget->dev,
165	"enable ep req: failure (%d:%d)\n", stp, err);
166	return err;
167	}
168
169	static int __enable_ep(struct usb_ep ep, struct usb_endpoint_descriptor desc)
170	{
72c973dd TB	171	int err;
	172	ep->desc = desc;
	173	err = usb_ep_enable(ep);
f6c826a9	174	ep->driver_data = dbgp.gadget;
	175	return err;
	176	}
	177
	178	static int dbgp_enable_ep(void)
	179	{
	180	int err, stp;
	181
	182	err = __enable_ep(dbgp.i_ep, &i_desc);
	183	if (err < 0) {
	184	stp = 1;
	185	goto fail_1;
	186	}
	187
	188	err = __enable_ep(dbgp.o_ep, &o_desc);
	189	if (err < 0) {
	190	stp = 2;
	191	goto fail_2;
	192	}
	193
	194	err = dbgp_enable_ep_req(dbgp.o_ep);
	195	if (err < 0) {
	196	stp = 3;
	197	goto fail_3;
	198	}
	199
	200	return 0;
	201
	202	fail_3:
	203	__disable_ep(dbgp.o_ep);
	204	fail_2:
	205	__disable_ep(dbgp.i_ep);
	206	fail_1:
	207	dev_dbg(&dbgp.gadget->dev, "enable ep: failure (%d:%d)\n", stp, err);
	208	return err;
	209	}
	210	#endif
	211
	212	static void dbgp_disconnect(struct usb_gadget *gadget)
	213	{
	214	#ifdef CONFIG_USB_G_DBGP_PRINTK
	215	dbgp_disable_ep();
	216	#else
	217	gserial_disconnect(dbgp.serial);
	218	#endif
	219	}
	220
	221	static void dbgp_unbind(struct usb_gadget *gadget)
	222	{
	223	#ifdef CONFIG_USB_G_DBGP_SERIAL
	224	kfree(dbgp.serial);
4958cf32	225	dbgp.serial = NULL;
f6c826a9	226	#endif
	227	if (dbgp.req) {
	228	kfree(dbgp.req->buf);
	229	usb_ep_free_request(gadget->ep0, dbgp.req);
4958cf32	230	dbgp.req = NULL;
f6c826a9	231	}
	232
	233	gadget->ep0->driver_data = NULL;
	234	}
	235
19b10a88 SAS	236	#ifdef CONFIG_USB_G_DBGP_SERIAL
	237	static unsigned char tty_line;
	238	#endif
	239
6876d58f	240	static int dbgp_configure_endpoints(struct usb_gadget *gadget)
f6c826a9	241	{
	242	int stp;
	243
	244	usb_ep_autoconfig_reset(gadget);
	245
	246	dbgp.i_ep = usb_ep_autoconfig(gadget, &i_desc);
	247	if (!dbgp.i_ep) {
	248	stp = 1;
	249	goto fail_1;
	250	}
	251
	252	dbgp.i_ep->driver_data = gadget;
	253	i_desc.wMaxPacketSize =
b8464bcf	254	cpu_to_le16(USB_DEBUG_MAX_PACKET_SIZE);
f6c826a9	255
	256	dbgp.o_ep = usb_ep_autoconfig(gadget, &o_desc);
	257	if (!dbgp.o_ep) {
	258	dbgp.i_ep->driver_data = NULL;
	259	stp = 2;
	260	goto fail_2;
	261	}
	262
	263	dbgp.o_ep->driver_data = gadget;
	264	o_desc.wMaxPacketSize =
b8464bcf	265	cpu_to_le16(USB_DEBUG_MAX_PACKET_SIZE);
f6c826a9	266
a8779ee9 SS	267	dbg_desc.bDebugInEndpoint = i_desc.bEndpointAddress;
a8779ee9 SS	268	dbg_desc.bDebugOutEndpoint = o_desc.bEndpointAddress;
f6c826a9	269
	270	#ifdef CONFIG_USB_G_DBGP_SERIAL
	271	dbgp.serial->in = dbgp.i_ep;
	272	dbgp.serial->out = dbgp.o_ep;
	273
72c973dd TB	274	dbgp.serial->in->desc = &i_desc;
72c973dd TB	275	dbgp.serial->out->desc = &o_desc;
6876d58f	276	#endif
f6c826a9	277
	278	return 0;
	279
f6c826a9	280	fail_2:
	281	dbgp.i_ep->driver_data = NULL;
	282	fail_1:
	283	dev_dbg(&dbgp.gadget->dev, "ep config: failure (%d)\n", stp);
	284	return -ENODEV;
	285	}
	286
c94e289f	287	static int dbgp_bind(struct usb_gadget *gadget,
ffe0b335	288	struct usb_gadget_driver *driver)
f6c826a9	289	{
	290	int err, stp;
	291
	292	dbgp.gadget = gadget;
	293
	294	dbgp.req = usb_ep_alloc_request(gadget->ep0, GFP_KERNEL);
	295	if (!dbgp.req) {
	296	err = -ENOMEM;
	297	stp = 1;
	298	goto fail;
	299	}
	300
	301	dbgp.req->buf = kmalloc(DBGP_REQ_EP0_LEN, GFP_KERNEL);
	302	if (!dbgp.req->buf) {
	303	err = -ENOMEM;
	304	stp = 2;
	305	goto fail;
	306	}
	307
	308	dbgp.req->length = DBGP_REQ_EP0_LEN;
	309	gadget->ep0->driver_data = gadget;
	310
	311	#ifdef CONFIG_USB_G_DBGP_SERIAL
	312	dbgp.serial = kzalloc(sizeof(struct gserial), GFP_KERNEL);
	313	if (!dbgp.serial) {
	314	stp = 3;
	315	err = -ENOMEM;
	316	goto fail;
	317	}
6876d58f KM	318
	319	if (gserial_alloc_line(&tty_line)) {
	320	stp = 4;
	321	err = -ENODEV;
	322	goto fail;
	323	}
f6c826a9	324	#endif
6876d58f	325
f6c826a9	326	err = dbgp_configure_endpoints(gadget);
f6c826a9	327	if (err < 0) {
6876d58f	328	stp = 5;
f6c826a9	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
6876d58f KM	384	err = dbgp_configure_endpoints(gadget);
	385	if (err < 0) {
	386	goto fail;
	387	}
19b10a88	388	err = gserial_connect(dbgp.serial, tty_line);
f6c826a9	389	#endif
	390	if (err < 0)
	391	goto fail;
	392	} else
	393	goto fail;
	394
c6a76781 DC	395	req->length = min(length, len);
	396	req->zero = len < req->length;
	397	if (data && req->length)
	398	memcpy(req->buf, data, req->length);
	399
	400	req->complete = dbgp_setup_complete;
	401	return usb_ep_queue(gadget->ep0, req, GFP_ATOMIC);
f6c826a9	402
	403	fail:
	404	dev_dbg(&dbgp.gadget->dev,
	405	"setup: failure req %x v %x\n", request, value);
	406	return err;
	407	}
	408
c94e289f	409	static struct usb_gadget_driver dbgp_driver = {
f6c826a9	410	.function = "dbgp",
7177aed4	411	.max_speed = USB_SPEED_HIGH,
93952956	412	.bind = dbgp_bind,
f6c826a9	413	.unbind = dbgp_unbind,
f6c826a9	414	.setup = dbgp_setup,
e45cfa20	415	.reset = dbgp_disconnect,
f6c826a9	416	.disconnect = dbgp_disconnect,
	417	.driver = {
	418	.owner = THIS_MODULE,
	419	.name = "dbgp"
	420	},
	421	};
	422
	423	static int __init dbgp_init(void)
	424	{
93952956	425	return usb_gadget_probe_driver(&dbgp_driver);
f6c826a9	426	}
	427
	428	static void __exit dbgp_exit(void)
	429	{
	430	usb_gadget_unregister_driver(&dbgp_driver);
	431	#ifdef CONFIG_USB_G_DBGP_SERIAL
19b10a88	432	gserial_free_line(tty_line);
f6c826a9	433	#endif
	434	}
	435
	436	MODULE_AUTHOR("Stephane Duverger");
	437	MODULE_LICENSE("GPL");
	438	module_init(dbgp_init);
	439	module_exit(dbgp_exit);