pcikbd.c

广州斯道2410普及版II的源代码

/* $Id: pcikbd.c,v 1.61 2001/08/18 09:40:46 davem Exp $
 * pcikbd.c: Ultra/AX PC keyboard support.
 *
 * Copyright (C) 1997  Eddie C. Dost  ([e-mail])
 * JavaStation support by Pete A. Zaitcev.
 *
 * This code is mainly put together from various places in
 * drivers/char, please refer to these sources for credits
 * to the original authors.
 */

#include <linux/config.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/poll.h>
#include <linux/slab.h>
#include <linux/errno.h>
#include <linux/random.h>
#include <linux/miscdevice.h>
#include <linux/kbd_ll.h>
#include <linux/kbd_kern.h>
#include <linux/vt_kern.h>
#include <linux/delay.h>
#include <linux/spinlock.h>
#include <linux/smp_lock.h>
#include <linux/init.h>

#include <asm/ebus.h>
#if defined(CONFIG_USB) && defined(CONFIG_SPARC64)
#include <asm/isa.h>
#endif
#include <asm/oplib.h>
#include <asm/irq.h>
#include <asm/io.h>
#include <asm/uaccess.h>

/*
 * Different platforms provide different permutations of names.
 * AXi - kb_ps2, kdmouse.
 * MrCoffee - keyboard, mouse.
 * Espresso - keyboard, kdmouse.
 */
#define	PCI_KB_NAME1	"kb_ps2"
#define PCI_KB_NAME2	"keyboard"
#define PCI_MS_NAME1	"kdmouse"
#define PCI_MS_NAME2	"mouse"

#include "pcikbd.h"
#include "sunserial.h"

#ifndef __sparc_v9__
static int pcikbd_mrcoffee = 0;
#else
#define pcikbd_mrcoffee 0
extern void (*prom_keyboard)(void);
#endif

static unsigned long pcikbd_iobase = 0;
static unsigned int pcikbd_irq = 0;

/* used only by send_data - set by keyboard_interrupt */
static volatile unsigned char reply_expected = 0;
static volatile unsigned char acknowledge = 0;
static volatile unsigned char resend = 0;

static spinlock_t pcikbd_lock = SPIN_LOCK_UNLOCKED;

static void pcikbd_write(int address, int data);
static int pcikbd_wait_for_input(void);

unsigned char pckbd_read_mask = KBD_STAT_OBF;

extern int pcikbd_init(void);
extern void pci_compute_shiftstate(void);
extern int pci_setkeycode(unsigned int, unsigned int);
extern int pci_getkeycode(unsigned int);
extern void pci_setledstate(struct kbd_struct *, unsigned int);
extern unsigned char pci_getledstate(void);

#define pcikbd_inb(x)     inb(x)
#define pcikbd_outb(v,x)  outb(v,x)

/* Wait for keyboard controller input buffer to drain.
 * Must be invoked under the pcikbd_lock.
 */
static void kb_wait(void)
{
	unsigned long timeout = 250;

	do {
		if(!(pcikbd_inb(pcikbd_iobase + KBD_STATUS_REG) & KBD_STAT_IBF))
			return;
		mdelay(1);
	} while (--timeout);
}

/*
 * Translation of escaped scancodes to keycodes.
 * This is now user-settable.
 * The keycodes 1-88,96-111,119 are fairly standard, and
 * should probably not be changed - changing might confuse X.
 * X also interprets scancode 0x5d (KEY_Begin).
 *
 * For 1-88 keycode equals scancode.
 */

#define E0_KPENTER 96
#define E0_RCTRL   97
#define E0_KPSLASH 98
#define E0_PRSCR   99
#define E0_RALT    100
#define E0_BREAK   101  /* (control-pause) */
#define E0_HOME    102
#define E0_UP      103
#define E0_PGUP    104
#define E0_LEFT    105
#define E0_RIGHT   106
#define E0_END     107
#define E0_DOWN    108
#define E0_PGDN    109
#define E0_INS     110
#define E0_DEL     111

#define E1_PAUSE   119

/*
 * The keycodes below are randomly located in 89-95,112-118,120-127.
 * They could be thrown away (and all occurrences below replaced by 0),
 * but that would force many users to use the `setkeycodes' utility, where
 * they needed not before. It does not matter that there are duplicates, as
 * long as no duplication occurs for any single keyboard.
 */
#define SC_LIM 89

#define FOCUS_PF1 85           /* actual code! */
#define FOCUS_PF2 89
#define FOCUS_PF3 90
#define FOCUS_PF4 91
#define FOCUS_PF5 92
#define FOCUS_PF6 93
#define FOCUS_PF7 94
#define FOCUS_PF8 95
#define FOCUS_PF9 120
#define FOCUS_PF10 121
#define FOCUS_PF11 122
#define FOCUS_PF12 123

#define JAP_86     124
/* [e-mail]:
 * The four keys are located over the numeric keypad, and are
 * labelled A1-A4. It's an rc930 keyboard, from
 * Regnecentralen/RC International, Now ICL.
 * Scancodes: 59, 5a, 5b, 5c.
 */
#define RGN1 124
#define RGN2 125
#define RGN3 126
#define RGN4 127

static unsigned char high_keys[128 - SC_LIM] = {
  RGN1, RGN2, RGN3, RGN4, 0, 0, 0,                   /* 0x59-0x5f */
  0, 0, 0, 0, 0, 0, 0, 0,                            /* 0x60-0x67 */
  0, 0, 0, 0, 0, FOCUS_PF11, 0, FOCUS_PF12,          /* 0x68-0x6f */
  0, 0, 0, FOCUS_PF2, FOCUS_PF9, 0, 0, FOCUS_PF3,    /* 0x70-0x77 */
  FOCUS_PF4, FOCUS_PF5, FOCUS_PF6, FOCUS_PF7,        /* 0x78-0x7b */
  FOCUS_PF8, JAP_86, FOCUS_PF10, 0                   /* 0x7c-0x7f */
};

/* BTC */
#define E0_MACRO   112
/* LK450 */
#define E0_F13     113
#define E0_F14     114
#define E0_HELP    115
#define E0_DO      116
#define E0_F17     117
#define E0_KPMINPLUS 118
/*
 * My OmniKey generates e0 4c for  the "OMNI" key and the
 * right alt key does nada. [[e-mail]]
 */
#define E0_OK	124
/*
 * New microsoft keyboard is rumoured to have
 * e0 5b (left window button), e0 5c (right window button),
 * e0 5d (menu button). [or: LBANNER, RBANNER, RMENU]
 * [or: Windows_L, Windows_R, TaskMan]
 */
#define E0_MSLW	125
#define E0_MSRW	126
#define E0_MSTM	127

static unsigned char e0_keys[128] = {
  0, 0, 0, 0, 0, 0, 0, 0,			      /* 0x00-0x07 */
  0, 0, 0, 0, 0, 0, 0, 0,			      /* 0x08-0x0f */
  0, 0, 0, 0, 0, 0, 0, 0,			      /* 0x10-0x17 */
  0, 0, 0, 0, E0_KPENTER, E0_RCTRL, 0, 0,	      /* 0x18-0x1f */
  0, 0, 0, 0, 0, 0, 0, 0,			      /* 0x20-0x27 */
  0, 0, 0, 0, 0, 0, 0, 0,			      /* 0x28-0x2f */
  0, 0, 0, 0, 0, E0_KPSLASH, 0, E0_PRSCR,	      /* 0x30-0x37 */
  E0_RALT, 0, 0, 0, 0, E0_F13, E0_F14, E0_HELP,	      /* 0x38-0x3f */
  E0_DO, E0_F17, 0, 0, 0, 0, E0_BREAK, E0_HOME,	      /* 0x40-0x47 */
  E0_UP, E0_PGUP, 0, E0_LEFT, E0_OK, E0_RIGHT, E0_KPMINPLUS, E0_END,/* 0x48-0x4f */
  E0_DOWN, E0_PGDN, E0_INS, E0_DEL, 0, 0, 0, 0,	      /* 0x50-0x57 */
  0, 0, 0, E0_MSLW, E0_MSRW, E0_MSTM, 0, 0,	      /* 0x58-0x5f */
  0, 0, 0, 0, 0, 0, 0, 0,			      /* 0x60-0x67 */
  0, 0, 0, 0, 0, 0, 0, E0_MACRO,		      /* 0x68-0x6f */
  0, 0, 0, 0, 0, 0, 0, 0,			      /* 0x70-0x77 */
  0, 0, 0, 0, 0, 0, 0, 0			      /* 0x78-0x7f */
};

/* Simple translation table for the SysRq keys */

#ifdef CONFIG_MAGIC_SYSRQ
unsigned char pcikbd_sysrq_xlate[128] =
	"\000\0331234567890-=\177\t"			/* 0x00 - 0x0f */
	"qwertyuiop[]\r\000as"				/* 0x10 - 0x1f */
	"dfghjkl;'`\000\\zxcv"				/* 0x20 - 0x2f */
	"bnm,./\000*\000 \000\201\202\203\204\205"	/* 0x30 - 0x3f */
	"\206\207\210\211\212\000\000789-456+1"		/* 0x40 - 0x4f */
	"230\177\000\000\213\214\000\000\000\000\000\000\000\000\000\000" /* 0x50 - 0x5f */
	"\r\000/";					/* 0x60 - 0x6f */
#endif

#define DEFAULT_KEYB_REP_DELAY	250
#define DEFAULT_KEYB_REP_RATE	30	/* cps */

static struct kbd_repeat kbdrate = {
	DEFAULT_KEYB_REP_DELAY,
	DEFAULT_KEYB_REP_RATE
};

static unsigned char parse_kbd_rate(struct kbd_repeat *r);
static int write_kbd_rate(unsigned char r);

int pcikbd_setkeycode(unsigned int scancode, unsigned int keycode)
{
	if(scancode < SC_LIM || scancode > 255 || keycode > 127)
		return -EINVAL;
	if(scancode < 128)
		high_keys[scancode - SC_LIM] = keycode;
	else
		e0_keys[scancode - 128] = keycode;
	return 0;
}

int pcikbd_getkeycode(unsigned int scancode)
{
	return
		(scancode < SC_LIM || scancode > 255) ? -EINVAL :
		(scancode < 128) ? high_keys[scancode - SC_LIM] :
		e0_keys[scancode - 128];
}

static int do_acknowledge(unsigned char scancode)
{
	if(reply_expected) {
		if(scancode == KBD_REPLY_ACK) {
			acknowledge = 1;
			reply_expected = 0;
			return 0;
		} else if(scancode == KBD_REPLY_RESEND) {
			resend = 1;
			reply_expected = 0;
			return 0;
		}
	}
	return 1;
}

#ifdef __sparc_v9__
static void pcikbd_enter_prom(void)
{
	pcikbd_write(KBD_DATA_REG, KBD_CMD_DISABLE);
	if(pcikbd_wait_for_input() != KBD_REPLY_ACK)
		printk("Prom Enter: Disable keyboard: no ACK\n");

	/* Disable PC scancode translation */
	pcikbd_write(KBD_CNTL_REG, KBD_CCMD_WRITE_MODE);
	pcikbd_write(KBD_DATA_REG, KBD_MODE_SYS);
	pcikbd_write(KBD_DATA_REG, KBD_CMD_ENABLE);
	if (pcikbd_wait_for_input() != KBD_REPLY_ACK)
		printk("Prom Enter: Enable Keyboard: no ACK\n");
}
#endif

static void ctrl_break(void)
{
	extern int stop_a_enabled;
	unsigned long timeout;
	int status, data;
	int mode;

	if (!stop_a_enabled)
		return;

	pcikbd_write(KBD_DATA_REG, KBD_CMD_DISABLE);
	if(pcikbd_wait_for_input() != KBD_REPLY_ACK)
		printk("Prom Enter: Disable keyboard: no ACK\n");

	/* Save current mode register settings */
	pcikbd_write(KBD_CNTL_REG, KBD_CCMD_READ_MODE);
	if ((mode = pcikbd_wait_for_input()) == -1)
		printk("Prom Enter: Read Mode: no ACK\n");

	/* Disable PC scancode translation */
	pcikbd_write(KBD_CNTL_REG, KBD_CCMD_WRITE_MODE);
	pcikbd_write(KBD_DATA_REG, mode & ~(KBD_MODE_KCC));
	pcikbd_write(KBD_DATA_REG, KBD_CMD_ENABLE);
	if (pcikbd_wait_for_input() != KBD_REPLY_ACK)
		printk("Prom Enter: Enable Keyboard: no ACK\n");

	/* Drop into OBP.
	 * Note that we must flush the user windows
	 * first before giving up control.
	 */
        flush_user_windows();
	prom_cmdline();

	/* Read prom's key up event (use short timeout) */
	do {
		timeout = 10;
		do {
			mdelay(1);
			status = pcikbd_inb(pcikbd_iobase + KBD_STATUS_REG);
			if (!(status & KBD_STAT_OBF))
				continue;
			data = pcikbd_inb(pcikbd_iobase + KBD_DATA_REG);
			if (status & (KBD_STAT_GTO | KBD_STAT_PERR))
				continue;
			break;
		} while (--timeout > 0);
	} while (timeout > 0);

	/* Reenable PC scancode translation */
	pcikbd_write(KBD_DATA_REG, KBD_CMD_DISABLE);
	if(pcikbd_wait_for_input() != KBD_REPLY_ACK)
		printk("Prom Leave: Disable keyboard: no ACK\n");

	pcikbd_write(KBD_CNTL_REG, KBD_CCMD_WRITE_MODE);
	pcikbd_write(KBD_DATA_REG, mode);
	pcikbd_write(KBD_DATA_REG, KBD_CMD_ENABLE);
	if (pcikbd_wait_for_input() != KBD_REPLY_ACK)
		printk("Prom Leave: Enable Keyboard: no ACK\n");

	/* Reset keyboard rate */
	write_kbd_rate(parse_kbd_rate(&kbdrate));
}

int pcikbd_translate(unsigned char scancode, unsigned char *keycode,
		     char raw_mode)
{
	static int prev_scancode = 0;
	int down = scancode & 0x80 ? 0 : 1;

	if (scancode == 0xe0 || scancode == 0xe1) {
		prev_scancode = scancode;
		return 0;
	}
	if (scancode == 0x00 || scancode == 0xff) {
		prev_scancode = 0;
		return 0;
	}
	scancode &= 0x7f;
	if(prev_scancode) {
		if(prev_scancode != 0xe0) {
			if(prev_scancode == 0xe1 && scancode == 0x1d) {
				prev_scancode = 0x100;
				return 0;
			} else if(prev_scancode == 0x100 && scancode == 0x45) {
				*keycode = E1_PAUSE;
				prev_scancode = 0;
			} else {
				prev_scancode = 0;
				return 0;
			}
		} else {
			prev_scancode = 0;
			if(scancode == 0x2a || scancode == 0x36)
				return 0;
			if(e0_keys[scancode])
				*keycode = e0_keys[scancode];
			else
				return 0;
		}
	} else if(scancode >= SC_LIM) {
		*keycode = high_keys[scancode - SC_LIM];
		if(!*keycode)
			return 0;

	} else
		*keycode = scancode;

	if (*keycode == E0_BREAK) {
		if (down)
			return 0;

		/* Handle ctrl-break event */
		ctrl_break();

		/* Send ctrl up event to the keyboard driver */
		*keycode = 0x1d;
	}

	return 1;
}

char pcikbd_unexpected_up(unsigned char keycode)
{
	if(keycode >= SC_LIM || keycode == 85)
		return 0;
	else
		return 0200;
}

static void
pcikbd_interrupt(int irq, void *dev_id, struct pt_regs *regs)
{
	unsigned long flags;
	unsigned char status;

	spin_lock_irqsave(&pcikbd_lock, flags);

	kbd_pt_regs = regs;
	status = pcikbd_inb(pcikbd_iobase + KBD_STATUS_REG);
	do {
		unsigned char scancode;

		if(status & pckbd_read_mask & KBD_STAT_MOUSE_OBF)
			break;
		scancode = pcikbd_inb(pcikbd_iobase + KBD_DATA_REG);
		if((status & KBD_STAT_OBF) && do_acknowledge(scancode))
			handle_scancode(scancode, !(scancode & 0x80));
		status = pcikbd_inb(pcikbd_iobase + KBD_STATUS_REG);
	} while(status & KBD_STAT_OBF);
	tasklet_schedule(&keyboard_tasklet);

	spin_unlock_irqrestore(&pcikbd_lock, flags);
}

static int send_data(unsigned char data)
{
	int retries = 3;
	unsigned long flags;

	do {
		unsigned long timeout = 1000;

		spin_lock_irqsave(&pcikbd_lock, flags);

		kb_wait();

		acknowledge = 0;
		resend = 0;
		reply_expected = 1;

		pcikbd_outb(data, pcikbd_iobase + KBD_DATA_REG);

		spin_unlock_irqrestore(&pcikbd_lock, flags);

		do {
			if (acknowledge)
				return 1;
			if (resend)
				break;
			mdelay(1);
		} while (--timeout);

		if (timeout == 0)
			break;

	} while (retries-- > 0);

	return 0;