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#include <linux/kernel.h>
#include <linux/malloc.h>
#include <linux/string.h>
#include <linux/timer.h>
#include <linux/sched.h>
#include <linux/config.h>
#include <linux/module.h>
#include <linux/kbd_ll.h>
#include "usb.h"
#define PCKBD_PRESSED 0x00
#define PCKBD_RELEASED 0x80
#define PCKBD_NEEDS_E0 0x80
#define USBKBD_MODIFIER_BASE 120
#define USBKBD_KEYCODE_OFFSET 2
#define USBKBD_KEYCODE_COUNT 6
#define USBKBD_VALID_KEYCODE(key) ((unsigned char)(key) > 3)
#define USBKBD_FIND_KEYCODE(down, key, count) \
((unsigned char*) memscan((down), (key), (count)) < ((down) + (count)))
#define USBKBD_REPEAT_DELAY (HZ / 4)
#define USBKBD_REPEAT_RATE (HZ / 20)
struct usb_keyboard
{
struct usb_device *dev;
unsigned long down[2];
unsigned char repeat_key;
struct timer_list repeat_timer;
struct list_head list;
};
extern unsigned char usb_kbd_map[];
static int usb_kbd_probe(struct usb_device *dev);
static void usb_kbd_disconnect(struct usb_device *dev);
static void usb_kbd_repeat(unsigned long dummy);
static LIST_HEAD(usb_kbd_list);
static struct usb_driver usb_kbd_driver =
{
"keyboard",
usb_kbd_probe,
usb_kbd_disconnect,
{NULL, NULL}
};
static void
usb_kbd_handle_key(unsigned char key, int down)
{
int scancode = (int) usb_kbd_map[key];
if(scancode)
{
#ifndef CONFIG_MAC_KEYBOARD
if(scancode & PCKBD_NEEDS_E0)
{
handle_scancode(0xe0, 1);
}
#endif /* CONFIG_MAC_KEYBOARD */
handle_scancode((scancode & ~PCKBD_NEEDS_E0), down);
}
}
static void
usb_kbd_repeat(unsigned long dev_id)
{
struct usb_keyboard *kbd = (struct usb_keyboard*) dev_id;
unsigned long flags;
save_flags(flags);
cli();
if(kbd->repeat_key)
{
usb_kbd_handle_key(kbd->repeat_key, 1);
/* reset repeat timer */
kbd->repeat_timer.function = usb_kbd_repeat;
kbd->repeat_timer.expires = jiffies + USBKBD_REPEAT_RATE;
kbd->repeat_timer.data = (unsigned long) kbd;
kbd->repeat_timer.prev = NULL;
kbd->repeat_timer.next = NULL;
add_timer(&kbd->repeat_timer);
}
restore_flags(flags);
}
static int
usb_kbd_irq(int state, void *buffer, int len, void *dev_id)
{
struct usb_keyboard *kbd = (struct usb_keyboard*) dev_id;
unsigned long *down = (unsigned long*) buffer;
if(kbd->down[0] != down[0] || kbd->down[1] != down[1])
{
unsigned char *olddown, *newdown;
unsigned char modsdelta, key;
int i;
/* handle modifier change */
modsdelta = (*(unsigned char*) down ^ *(unsigned char*) kbd->down);
if(modsdelta)
{
for(i = 0; i < 8; i++)
{
if(modsdelta & 0x01)
{
int pressed = (*(unsigned char*) down >> i) & 0x01;
usb_kbd_handle_key(
i + USBKBD_MODIFIER_BASE,
pressed);
}
modsdelta >>= 1;
}
}
olddown = (unsigned char*) kbd->down + USBKBD_KEYCODE_OFFSET;
newdown = (unsigned char*) down + USBKBD_KEYCODE_OFFSET;
/* handle released keys */
for(i = 0; i < USBKBD_KEYCODE_COUNT; i++)
{
key = olddown[i];
if(USBKBD_VALID_KEYCODE(key)
&& !USBKBD_FIND_KEYCODE(newdown, key, USBKBD_KEYCODE_COUNT))
{
usb_kbd_handle_key(key, 0);
}
}
/* handle pressed keys */
kbd->repeat_key = 0;
for(i = 0; i < USBKBD_KEYCODE_COUNT; i++)
{
key = newdown[i];
if(USBKBD_VALID_KEYCODE(key)
&& !USBKBD_FIND_KEYCODE(olddown, key, USBKBD_KEYCODE_COUNT))
{
usb_kbd_handle_key(key, 1);
kbd->repeat_key = key;
}
}
/* set repeat timer if any keys were pressed */
if(kbd->repeat_key)
{
del_timer(&kbd->repeat_timer);
kbd->repeat_timer.function = usb_kbd_repeat;
kbd->repeat_timer.expires = jiffies + USBKBD_REPEAT_DELAY;
kbd->repeat_timer.data = (unsigned long) kbd;
kbd->repeat_timer.prev = NULL;
kbd->repeat_timer.next = NULL;
add_timer(&kbd->repeat_timer);
}
kbd->down[0] = down[0];
kbd->down[1] = down[1];
}
return 1;
}
static int
usb_kbd_probe(struct usb_device *dev)
{
struct usb_interface_descriptor *interface;
struct usb_endpoint_descriptor *endpoint;
struct usb_keyboard *kbd;
if (dev->descriptor.bNumConfigurations < 1)
return -1;
interface = &dev->config[0].altsetting[0].interface[0];
endpoint = &interface->endpoint[0];
if(interface->bInterfaceClass != 3
|| interface->bInterfaceSubClass != 1
|| interface->bInterfaceProtocol != 1)
{
return -1;
}
printk(KERN_INFO "USB HID boot protocol keyboard detected.\n");
kbd = kmalloc(sizeof(struct usb_keyboard), GFP_KERNEL);
if(kbd)
{
memset(kbd, 0, sizeof(*kbd));
kbd->dev = dev;
dev->private = kbd;
usb_set_configuration(dev, dev->config[0].bConfigurationValue);
usb_set_protocol(dev, 0);
usb_set_idle(dev, 0, 0);
usb_request_irq(dev,
usb_rcvctrlpipe(dev, endpoint->bEndpointAddress),
usb_kbd_irq,
endpoint->bInterval,
kbd);
list_add(&kbd->list, &usb_kbd_list);
}
return 0;
}
static void
usb_kbd_disconnect(struct usb_device *dev)
{
struct usb_keyboard *kbd = (struct usb_keyboard*) dev->private;
if(kbd)
{
dev->private = NULL;
list_del(&kbd->list);
del_timer(&kbd->repeat_timer);
kfree(kbd);
}
printk(KERN_INFO "USB HID boot protocol keyboard removed.\n");
}
int usb_kbd_init(void)
{
usb_register(&usb_kbd_driver);
return 0;
}
#ifdef MODULE
int init_module(void)
{
return usb_kbd_init();
}
void cleanup_module(void)
{
usb_deregister(&usb_kbd_driver);
}
#endif
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