forked from Minki/linux
a8779ee94e
Stripping the direction bit off will produce an invalid descriptor. Signed-off-by: Sven Schnelle <svens@stackframe.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
432 lines
8.3 KiB
C
432 lines
8.3 KiB
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 = usb_ep_enable(ep, desc);
|
|
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;
|
|
device_desc.bMaxPacketSize0 = gadget->ep0->maxpacket;
|
|
|
|
#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;
|
|
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);
|