avr/qmk/firmware - [no description]

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/******************************************************************************
 * keyhandler.c
 */

#include <xen/keyhandler.h> 
#include <xen/reboot.h>
#include <xen/event.h>
#include <xen/console.h>
#include <xen/serial.h>
#include <xen/sched.h>
#include <xen/softirq.h>

#define KEY_MAX 256
#define STR_MAX  64

static struct {
    union {
        keyhandler_t     *handler;
        irq_keyhandler_t *irq_handler;
    } u;
    unsigned int flags;
    char         desc[STR_MAX]; 
} key_table[KEY_MAX]; 

#define KEYHANDLER_IRQ_CALLBACK 0x1

static unsigned char keypress_key;

static void keypress_softirq(void)
{
    keyhandler_t *h;
    unsigned char key = keypress_key;
    if ( (h = key_table[key].u.handler) != NULL )
        (*h)(key);
}

void handle_keypress(unsigned char key, struct xen_regs *regs)
{
    irq_keyhandler_t *h;

    if ( key_table[key].flags & KEYHANDLER_IRQ_CALLBACK )
    {
        if ( (h = key_table[key].u.irq_handler) != NULL )
            (*h)(key, regs);
    }
    else
    {
        keypress_key = key;
        raise_softirq(KEYPRESS_SOFTIRQ);
    }
}

void register_keyhandler(
    unsigned char key, keyhandler_t *handler, char *desc)
{
    ASSERT(key_table[key].u.handler == NULL);
    key_table[key].u.handler = handler;
    key_table[key].flags     = 0;
    strncpy(key_table[key].desc, desc, STR_MAX);
    key_table[key].desc[STR_MAX-1] = '\0'; 
}

void register_irq_keyhandler(
    unsigned char key, irq_keyhandler_t *handler, char *desc)
{
    ASSERT(key_table[key].u.irq_handler == NULL);
    key_table[key].u.irq_handler = handler;
    key_table[key].flags         = KEYHANDLER_IRQ_CALLBACK;
    strncpy(key_table[key].desc, desc, STR_MAX);
    key_table[key].desc[STR_MAX-1] = '\0'; 
}

static void show_handlers(unsigned char key)
{
    int i; 
    printk("'%c' pressed -> showing installed handlers\n", key);
    for ( i = 0; i < KEY_MAX; i++ ) 
        if ( key_table[i].u.handler != NULL ) 
            printk(" key '%c' (ascii '%02x') => %s\n", 
                   (i<33 || i>126)?(' '):(i),i,
                   key_table[i].desc);
}

static void dump_registers(unsigned char key, struct xen_regs *regs)


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