Linux下 USB设备驱动分析（原创）

/*
* $Id: usbmouse.c,v 1.15 2001/12/27 10:37:41 vojtech Exp $
*
* Copyright (c) 1999-2001 Vojtech Pavlik
*
* USB HIDBP Mouse support
*//*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* Should you need to contact me, the author, you can do so either by
* e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail:
* Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic
*/#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/usb/input.h>
#include <linux/hid.h>/*
* Version Information
*/
#define DRIVER_VERSION "v1.6"
#define DRIVER_AUTHOR "Vojtech Pavlik <vojtech@ucw.cz>"
#define DRIVER_DESC "USB HID Boot Protocol mouse driver"
#define DRIVER_LICENSE "GPL"MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE(DRIVER_LICENSE);struct usb_mouse {
char name[];
char phys[];
struct usb_device *usbdev;
struct input_dev *dev;
struct urb *irq; signed char *data;
dma_addr_t data_dma;
};static void usb_mouse_irq(struct urb *urb)
{
struct usb_mouse *mouse = urb->context;
signed char *data = mouse->data;
struct input_dev *dev = mouse->dev;
int status; switch (urb->status) {
case : /* success */
break;
case -ECONNRESET: /* unlink */
case -ENOENT:
case -ESHUTDOWN:
return;
/* -EPIPE: should clear the halt */
default: /* error */
goto resubmit;
} input_report_key(dev, BTN_LEFT, data[] & 0x01);
input_report_key(dev, BTN_RIGHT, data[] & 0x02);
input_report_key(dev, BTN_MIDDLE, data[] & 0x04);
input_report_key(dev, BTN_SIDE, data[] & 0x08);
input_report_key(dev, BTN_EXTRA, data[] & 0x10); input_report_rel(dev, REL_X, data[]);
input_report_rel(dev, REL_Y, data[]);
input_report_rel(dev, REL_WHEEL, data[]); input_sync(dev);
resubmit:
status = usb_submit_urb (urb, GFP_ATOMIC);
if (status)
err ("can't resubmit intr, %s-%s/input0, status %d",
mouse->usbdev->bus->bus_name,
mouse->usbdev->devpath, status);
}static int usb_mouse_open(struct input_dev *dev)
{
struct usb_mouse *mouse = input_get_drvdata(dev); mouse->irq->dev = mouse->usbdev;
if (usb_submit_urb(mouse->irq, GFP_KERNEL))
return -EIO; return ;
}static void usb_mouse_close(struct input_dev *dev)
{
struct usb_mouse *mouse = input_get_drvdata(dev); usb_kill_urb(mouse->irq);
}static int usb_mouse_probe(struct usb_interface *intf, const struct usb_device_id *id)
{
struct usb_device *dev = interface_to_usbdev(intf);
struct usb_host_interface *interface;
struct usb_endpoint_descriptor *endpoint;
struct usb_mouse *mouse;
struct input_dev *input_dev;
int pipe, maxp;
int error = -ENOMEM; interface = intf->cur_altsetting; if (interface->desc.bNumEndpoints != )
return -ENODEV; endpoint = &interface->endpoint[].desc;
if (!usb_endpoint_is_int_in(endpoint))
return -ENODEV; pipe = usb_rcvintpipe(dev, endpoint->bEndpointAddress);
maxp = usb_maxpacket(dev, pipe, usb_pipeout(pipe)); mouse = kzalloc(sizeof(struct usb_mouse), GFP_KERNEL);
input_dev = input_allocate_device();
if (!mouse || !input_dev)
goto fail1; mouse->data = usb_buffer_alloc(dev, , GFP_ATOMIC, &mouse->data_dma);
if (!mouse->data)
goto fail1; mouse->irq = usb_alloc_urb(, GFP_KERNEL);
if (!mouse->irq)
goto fail2; mouse->usbdev = dev;
mouse->dev = input_dev; if (dev->manufacturer)
strlcpy(mouse->name, dev->manufacturer, sizeof(mouse->name)); if (dev->product) {
if (dev->manufacturer)
strlcat(mouse->name, " ", sizeof(mouse->name));
strlcat(mouse->name, dev->product, sizeof(mouse->name));
} if (!strlen(mouse->name))
snprintf(mouse->name, sizeof(mouse->name),
"USB HIDBP Mouse %04x:%04x",
le16_to_cpu(dev->descriptor.idVendor),
le16_to_cpu(dev->descriptor.idProduct)); usb_make_path(dev, mouse->phys, sizeof(mouse->phys));
strlcat(mouse->phys, "/input0", sizeof(mouse->phys)); input_dev->name = mouse->name;
input_dev->phys = mouse->phys;
usb_to_input_id(dev, &input_dev->id);
input_dev->dev.parent = &intf->dev; input_dev->evbit[] = BIT(EV_KEY) | BIT(EV_REL);
input_dev->keybit[LONG(BTN_MOUSE)] = BIT(BTN_LEFT) | BIT(BTN_RIGHT) | BIT(BTN_MIDDLE);
input_dev->relbit[] = BIT(REL_X) | BIT(REL_Y);
input_dev->keybit[LONG(BTN_MOUSE)] |= BIT(BTN_SIDE) | BIT(BTN_EXTRA);
input_dev->relbit[] |= BIT(REL_WHEEL); input_set_drvdata(input_dev, mouse); input_dev->open = usb_mouse_open;
input_dev->close = usb_mouse_close; usb_fill_int_urb(mouse->irq, dev, pipe, mouse->data,
(maxp > ? : maxp),
usb_mouse_irq, mouse, endpoint->bInterval);
mouse->irq->transfer_dma = mouse->data_dma;
mouse->irq->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; error = input_register_device(mouse->dev);
if (error)
goto fail3; usb_set_intfdata(intf, mouse);
return ;fail3:
usb_free_urb(mouse->irq);
fail2:
usb_buffer_free(dev, , mouse->data, mouse->data_dma);
fail1:
input_free_device(input_dev);
kfree(mouse);
return error;
}static void usb_mouse_disconnect(struct usb_interface *intf)
{
struct usb_mouse *mouse = usb_get_intfdata (intf); usb_set_intfdata(intf, NULL);
if (mouse) {
usb_kill_urb(mouse->irq);
input_unregister_device(mouse->dev);
usb_free_urb(mouse->irq);
usb_buffer_free(interface_to_usbdev(intf), , mouse->data, mouse->data_dma);
kfree(mouse);
}
}static struct usb_device_id usb_mouse_id_table [] = {
{ USB_INTERFACE_INFO(USB_INTERFACE_CLASS_HID, USB_INTERFACE_SUBCLASS_BOOT,
USB_INTERFACE_PROTOCOL_MOUSE) },
{ } /* Terminating entry */
};MODULE_DEVICE_TABLE (usb, usb_mouse_id_table);static struct usb_driver usb_mouse_driver = {
.name = "usbmouse",
.probe = usb_mouse_probe,
.disconnect = usb_mouse_disconnect,
.id_table = usb_mouse_id_table,
};static int __init usb_mouse_init(void)
{
int retval = usb_register(&usb_mouse_driver);
if (retval == )
info(DRIVER_VERSION ":" DRIVER_DESC);
return retval;
}static void __exit usb_mouse_exit(void)
{
usb_deregister(&usb_mouse_driver);
}module_init(usb_mouse_init);
module_exit(usb_mouse_exit);

#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/usb/input.h>
#include <linux/hid.h>
//
static struct usb_device_id usbmouse_as_key_id_table [] = {
{ USB_INTERFACE_INFO(USB_INTERFACE_CLASS_HID, USB_INTERFACE_SUBCLASS_BOOT,
USB_INTERFACE_PROTOCOL_MOUSE) },
//{USB_DEVICE(0x1234,0x5678)},
{ } /* Terminating entry */
};static int usbmouse_as_key_probe(struct usb_interface *intf, const struct usb_device_id *id)
{
printk("found usbmouse!\n");
return ;
}static void usbmouse_as_key_disconnect(struct usb_interface *intf)
{
printk("disconnect usbmouse!\n");
}/* 1.分配设置usb_driver */
static struct usb_driver usbmouse_as_key_driver = {
.name = "usbmouse_as_key_",
.probe = usbmouse_as_key_probe,
.disconnect = usbmouse_as_key_disconnect,
.id_table = usbmouse_as_key_id_table,
};static int usbmouse_as_key_init(void)
{
/* 2.注册 */
usb_register(&usbmouse_as_key_driver);
return ;
}static void usbmouse_as_key_exit(void)
{
usb_deregister(&usbmouse_as_key_driver);
}module_init(usbmouse_as_key_init);
module_exit(usbmouse_as_key_exit);MODULE_LICENSE("GPL");