USB: EHCI Debug Port Device Gadget
This is a patch that implements an USB EHCI Debug Device using the Gadget API. This patch applies to a 2.6.35-rc3 kernel. The gadget needs a compliant usb controller that forwards the USB_DEVICE_DEBUG_MODE feature to its gadget. The gadget provides two configuration modes, one that only printk() the received data, and one that exposes a serial device to userland (/dev/ttyGSxxx). The gadget has been tested on an IGEPv2 board running a 2.6.35-rc1 kernel. The debug port was fed on the host side by a 2.6.34 kernel. Signed-off-by: Stephane Duverger <stephane.duverger@gmail.com> Cc: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
stephane duverger
Greg Kroah-Hartman
parent
fd63b10ba3
commit
f6c826a900
|
|
@ -915,6 +915,34 @@ config USB_G_HID
|
|||
Say "y" to link the driver statically, or "m" to build a
|
||||
dynamically linked module called "g_hid".
|
||||
|
||||
config USB_G_DBGP
|
||||
tristate "EHCI Debug Device Gadget"
|
||||
help
|
||||
This gadget emulates an EHCI Debug device. This is useful when you want
|
||||
to interact with an EHCI Debug Port.
|
||||
|
||||
Say "y" to link the driver statically, or "m" to build a
|
||||
dynamically linked module called "g_dbgp".
|
||||
|
||||
if USB_G_DBGP
|
||||
choice
|
||||
prompt "EHCI Debug Device mode"
|
||||
default USB_G_DBGP_SERIAL
|
||||
|
||||
config USB_G_DBGP_PRINTK
|
||||
depends on USB_G_DBGP
|
||||
bool "printk"
|
||||
help
|
||||
Directly printk() received data. No interaction.
|
||||
|
||||
config USB_G_DBGP_SERIAL
|
||||
depends on USB_G_DBGP
|
||||
bool "serial"
|
||||
help
|
||||
Userland can interact using /dev/ttyGSxxx.
|
||||
endchoice
|
||||
endif
|
||||
|
||||
# put drivers that need isochronous transfer support (for audio
|
||||
# or video class gadget drivers), or specific hardware, here.
|
||||
config USB_G_WEBCAM
|
||||
|
|
|
|||
|
|
@ -44,6 +44,7 @@ g_printer-objs := printer.o
|
|||
g_cdc-objs := cdc2.o
|
||||
g_multi-objs := multi.o
|
||||
g_hid-objs := hid.o
|
||||
g_dbgp-objs := dbgp.o
|
||||
g_nokia-objs := nokia.o
|
||||
g_webcam-objs := webcam.o
|
||||
|
||||
|
|
@ -60,6 +61,7 @@ obj-$(CONFIG_USB_G_PRINTER) += g_printer.o
|
|||
obj-$(CONFIG_USB_MIDI_GADGET) += g_midi.o
|
||||
obj-$(CONFIG_USB_CDC_COMPOSITE) += g_cdc.o
|
||||
obj-$(CONFIG_USB_G_HID) += g_hid.o
|
||||
obj-$(CONFIG_USB_G_DBGP) += g_dbgp.o
|
||||
obj-$(CONFIG_USB_G_MULTI) += g_multi.o
|
||||
obj-$(CONFIG_USB_G_NOKIA) += g_nokia.o
|
||||
obj-$(CONFIG_USB_G_WEBCAM) += g_webcam.o
|
||||
|
|
|
|||
|
|
@ -0,0 +1,434 @@
|
|||
/*
|
||||
* 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 & 0x7f;
|
||||
dbg_desc.bDebugOutEndpoint = o_desc.bEndpointAddress & 0x7f;
|
||||
|
||||
#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 = 0;
|
||||
void *data;
|
||||
u16 len;
|
||||
|
||||
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;
|
||||
}
|
||||
} else if (request == USB_REQ_SET_FEATURE &&
|
||||
value == USB_DEVICE_DEBUG_MODE) {
|
||||
len = 0;
|
||||
data = NULL;
|
||||
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;
|
||||
|
||||
if (len >= 0) {
|
||||
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,
|
||||
.bind = dbgp_bind,
|
||||
.unbind = dbgp_unbind,
|
||||
.setup = dbgp_setup,
|
||||
.disconnect = dbgp_disconnect,
|
||||
.driver = {
|
||||
.owner = THIS_MODULE,
|
||||
.name = "dbgp"
|
||||
},
|
||||
};
|
||||
|
||||
static int __init dbgp_init(void)
|
||||
{
|
||||
return usb_gadget_register_driver(&dbgp_driver);
|
||||
}
|
||||
|
||||
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);
|
||||
Loading…
Reference in New Issue