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#include <linux/ioport.h>
#include <linux/init.h>
#include <linux/serio.h>
#include <linux/sched.h>
#include <asm/io.h>
MODULE_AUTHOR(""Osamu Tomita <[email protected]>"");
MODULE_DESCRIPTION(""NEC PC-9801 keyboard controller driver"");
MODULE_LICENSE(""GPL"");
/*
* Names.
*/
#define KBD98_PHYS_DESC ""isa0041/serio0""
/*
* IRQs.
*/
#define KBD98_IRQ 1
/*
* Register numbers.
*/
#define KBD98_COMMAND_REG 0x43
#define KBD98_STATUS_REG 0x43
#define KBD98_DATA_REG 0x41
spinlock_t kbd98io_lock = SPIN_LOCK_UNLOCKED;
static struct serio kbd98_port;
extern struct pt_regs *kbd_pt_regs;
static irqreturn_t kbd98io_interrupt(int irq, void *dev_id, struct pt_regs *regs);
/*
* kbd98_flush() flushes all data that may be in the keyboard buffers
*/
static int kbd98_flush(void)
{
unsigned long flags;
spin_lock_irqsave(&kbd98io_lock, flags);
while (inb(KBD98_STATUS_REG) & 0x02) /* RxRDY */
inb(KBD98_DATA_REG);
if (inb(KBD98_STATUS_REG) & 0x38)
printk(""98kbd-io: Keyboard error!\n"");
spin_unlock_irqrestore(&kbd98io_lock, flags);
return 0;
}
/*
* kbd98_write() sends a byte out through the keyboard interface.
*/
static int kbd98_write(struct serio *port, unsigned char c)
{
unsigned long flags;
spin_lock_irqsave(&kbd98io_lock, flags);
outb(0, 0x5f); /* wait */
outb(0x17, KBD98_COMMAND_REG); /* enable send command */
outb(0, 0x5f); /* wait */
outb(c, KBD98_DATA_REG);
outb(0, 0x5f); /* wait */
outb(0x16, KBD98_COMMAND_REG); /* disable send command */
outb(0, 0x5f); /* wait */
spin_unlock_irqrestore(&kbd98io_lock, flags);
return 0;
}
/*
* kbd98_open() is called when a port is open by the higher layer.
* It allocates the interrupt and enables in in the chip.
*/
static int kbd98_open(struct serio *port)
{
kbd98_flush();
if (request_irq(KBD98_IRQ, kbd98io_interrupt, 0, ""kbd98"", NULL)) {
printk(KERN_ERR ""98kbd-io.c: Can't get irq %d for %s, unregistering the port.\n"", KBD98_IRQ, ""KBD"");
serio_unregister_port(port);
return -1;
}
return 0;
}