i8042.c

优龙2410linux2.6.8内核源代码

	}

/*
 * Enable all muxed ports.
 */

	for (i = 0; i < 4; i++) {
		i8042_command(&param, I8042_CMD_MUX_PFX + i);
		i8042_command(&param, I8042_CMD_AUX_ENABLE);
	}

	return 0;
}


/*
 * i8042_check_mux() checks whether the controller supports the PS/2 Active
 * Multiplexing specification by Synaptics, Phoenix, Insyde and
 * LCS/Telegraphics.
 */

static int __init i8042_check_mux(struct i8042_values *values)
{
	unsigned char mux_version;

	if (i8042_enable_mux_mode(values, &mux_version))
		return -1;

	/* Workaround for broken chips which seem to support MUX, but in reality don't. */
	/* They all report version 10.12 */
	if (mux_version == 0xAC)
		return -1;

	printk(KERN_INFO "i8042.c: Detected active multiplexing controller, rev %d.%d.\n",
		(mux_version >> 4) & 0xf, mux_version & 0xf);

	if (i8042_enable_mux_ports(values))
		return -1;

	i8042_mux_present = 1;
	return 0;
}


/*
 * i8042_check_aux() applies as much paranoia as it can at detecting
 * the presence of an AUX interface.
 */

static int __init i8042_check_aux(struct i8042_values *values)
{
	unsigned char param;
	static int i8042_check_aux_cookie;

/*
 * Check if AUX irq is available. If it isn't, then there is no point
 * in trying to detect AUX presence.
 */

	if (request_irq(values->irq, i8042_interrupt, SA_SHIRQ,
				"i8042", &i8042_check_aux_cookie))
                return -1;
	free_irq(values->irq, &i8042_check_aux_cookie);

/*
 * Get rid of bytes in the queue.
 */

	i8042_flush();

/*
 * Internal loopback test - filters out AT-type i8042's. Unfortunately
 * SiS screwed up and their 5597 doesn't support the LOOP command even
 * though it has an AUX port.
 */

	param = 0x5a;
	if (i8042_command(&param, I8042_CMD_AUX_LOOP) || param != 0xa5) {

/*
 * External connection test - filters out AT-soldered PS/2 i8042's
 * 0x00 - no error, 0x01-0x03 - clock/data stuck, 0xff - general error
 * 0xfa - no error on some notebooks which ignore the spec
 * Because it's common for chipsets to return error on perfectly functioning
 * AUX ports, we test for this only when the LOOP command failed.
 */

		if (i8042_command(&param, I8042_CMD_AUX_TEST)
		    	|| (param && param != 0xfa && param != 0xff))
				return -1;
	}

/*
 * Bit assignment test - filters out PS/2 i8042's in AT mode
 */

	if (i8042_command(&param, I8042_CMD_AUX_DISABLE))
		return -1;
	if (i8042_command(&param, I8042_CMD_CTL_RCTR) || (~param & I8042_CTR_AUXDIS)) {
		printk(KERN_WARNING "Failed to disable AUX port, but continuing anyway... Is this a SiS?\n");
		printk(KERN_WARNING "If AUX port is really absent please use the 'i8042.noaux' option.\n");
	}

	if (i8042_command(&param, I8042_CMD_AUX_ENABLE))
		return -1;
	if (i8042_command(&param, I8042_CMD_CTL_RCTR) || (param & I8042_CTR_AUXDIS))
		return -1;

/*
 * Disable the interface.
 */

	i8042_ctr |= I8042_CTR_AUXDIS;
	i8042_ctr &= ~I8042_CTR_AUXINT;

	if (i8042_command(&i8042_ctr, I8042_CMD_CTL_WCTR))
		return -1;

	return 0;
}


/*
 * i8042_port_register() marks the device as existing,
 * registers it, and reports to the user.
 */

static int __init i8042_port_register(struct i8042_values *values, struct serio *port)
{
	values->exists = 1;

	i8042_ctr &= ~values->disable;

	if (i8042_command(&i8042_ctr, I8042_CMD_CTL_WCTR)) {
		printk(KERN_WARNING "i8042.c: Can't write CTR while registering.\n");
		values->exists = 0;
		return -1;
	}

	printk(KERN_INFO "serio: i8042 %s port at %#lx,%#lx irq %d\n",
	       values->name,
	       (unsigned long) I8042_DATA_REG,
	       (unsigned long) I8042_COMMAND_REG,
	       values->irq);

	serio_register_port(port);

	return 0;
}


static void i8042_timer_func(unsigned long data)
{
	i8042_interrupt(0, NULL, NULL);
}


/*
 * i8042_controller init initializes the i8042 controller, and,
 * most importantly, sets it into non-xlated mode if that's
 * desired.
 */

static int i8042_controller_init(void)
{

/*
 * Test the i8042. We need to know if it thinks it's working correctly
 * before doing anything else.
 */

	i8042_flush();

	if (i8042_reset) {

		unsigned char param;

		if (i8042_command(&param, I8042_CMD_CTL_TEST)) {
			printk(KERN_ERR "i8042.c: i8042 controller self test timeout.\n");
			return -1;
		}

		if (param != I8042_RET_CTL_TEST) {
			printk(KERN_ERR "i8042.c: i8042 controller selftest failed. (%#x != %#x)\n",
				 param, I8042_RET_CTL_TEST);
			return -1;
		}
	}

/*
 * Save the CTR for restoral on unload / reboot.
 */

	if (i8042_command(&i8042_ctr, I8042_CMD_CTL_RCTR)) {
		printk(KERN_ERR "i8042.c: Can't read CTR while initializing i8042.\n");
		return -1;
	}

	i8042_initial_ctr = i8042_ctr;

/*
 * Disable the keyboard interface and interrupt.
 */

	i8042_ctr |= I8042_CTR_KBDDIS;
	i8042_ctr &= ~I8042_CTR_KBDINT;

/*
 * Handle keylock.
 */

	if (~i8042_read_status() & I8042_STR_KEYLOCK) {
		if (i8042_unlock)
			i8042_ctr |= I8042_CTR_IGNKEYLOCK;
		 else
			printk(KERN_WARNING "i8042.c: Warning: Keylock active.\n");
	}

/*
 * If the chip is configured into nontranslated mode by the BIOS, don't
 * bother enabling translating and be happy.
 */

	if (~i8042_ctr & I8042_CTR_XLATE)
		i8042_direct = 1;

/*
 * Set nontranslated mode for the kbd interface if requested by an option.
 * After this the kbd interface becomes a simple serial in/out, like the aux
 * interface is. We don't do this by default, since it can confuse notebook
 * BIOSes.
 */

	if (i8042_direct) {
		i8042_ctr &= ~I8042_CTR_XLATE;
		i8042_kbd_port.type = SERIO_8042;
	}

/*
 * Write CTR back.
 */

	if (i8042_command(&i8042_ctr, I8042_CMD_CTL_WCTR)) {
		printk(KERN_ERR "i8042.c: Can't write CTR while initializing i8042.\n");
		return -1;
	}

	return 0;
}


/*
 * Reset the controller.
 */
void i8042_controller_reset(void)
{
	if (i8042_reset) {
		unsigned char param;

		if (i8042_command(&param, I8042_CMD_CTL_TEST))
			printk(KERN_ERR "i8042.c: i8042 controller reset timeout.\n");
	}

/*
 * Restore the original control register setting.
 */

	i8042_ctr = i8042_initial_ctr;

	if (i8042_command(&i8042_ctr, I8042_CMD_CTL_WCTR))
		printk(KERN_WARNING "i8042.c: Can't restore CTR.\n");
}


/*
 * Here we try to reset everything back to a state in which the BIOS will be
 * able to talk to the hardware when rebooting.
 */

void i8042_controller_cleanup(void)
{
	int i;

	i8042_flush();

/*
 * Reset anything that is connected to the ports.
 */

	if (i8042_kbd_values.exists)
		serio_cleanup(&i8042_kbd_port);

	if (i8042_aux_values.exists)
		serio_cleanup(&i8042_aux_port);

	for (i = 0; i < 4; i++)
		if (i8042_mux_values[i].exists)
			serio_cleanup(i8042_mux_port + i);

	i8042_controller_reset();
}


/*
 * Here we try to restore the original BIOS settings
 */

static int i8042_controller_suspend(void)
{
	del_timer_sync(&i8042_timer);
	i8042_controller_reset();

	return 0;
}


/*
 * Here we try to reset everything back to a state in which suspended
 */

static int i8042_controller_resume(void)
{
	int i;

	if (i8042_controller_init()) {
		printk(KERN_ERR "i8042: resume failed\n");
		return -1;
	}

	if (i8042_mux_present)
		if (i8042_enable_mux_mode(&i8042_aux_values, NULL) ||
		    i8042_enable_mux_ports(&i8042_aux_values)) {
			printk(KERN_WARNING "i8042: failed to resume active multiplexor, mouse won't work.\n");
		}

/*
 * Reconnect anything that was connected to the ports.
 */

	if (i8042_kbd_values.exists && i8042_activate_port(&i8042_kbd_port) == 0)
		serio_reconnect(&i8042_kbd_port);

	if (i8042_aux_values.exists && i8042_activate_port(&i8042_aux_port) == 0)
		serio_reconnect(&i8042_aux_port);

	for (i = 0; i < 4; i++)
		if (i8042_mux_values[i].exists && i8042_activate_port(i8042_mux_port + i) == 0)
			serio_reconnect(i8042_mux_port + i);
/*
 * Restart timer (for polling "stuck" data)
 */
	mod_timer(&i8042_timer, jiffies + I8042_POLL_PERIOD);

	return 0;
}


/*
 * We need to reset the 8042 back to original mode on system shutdown,
 * because otherwise BIOSes will be confused.
 */

static int i8042_notify_sys(struct notifier_block *this, unsigned long code,
        		    void *unused)
{
        if (code == SYS_DOWN || code == SYS_HALT)
        	i8042_controller_cleanup();
        return NOTIFY_DONE;
}

static struct notifier_block i8042_notifier=
{
        i8042_notify_sys,
        NULL,
        0
};

/*
 * Suspend/resume handlers for the new PM scheme (driver model)
 */
static int i8042_suspend(struct sys_device *dev, u32 state)
{
	return i8042_controller_suspend();
}

static int i8042_resume(struct sys_device *dev)
{
	return i8042_controller_resume();
}

static struct sysdev_class kbc_sysclass = {
	set_kset_name("i8042"),
	.suspend = i8042_suspend,
	.resume = i8042_resume,
};

static struct sys_device device_i8042 = {
       .id     = 0,
       .cls    = &kbc_sysclass,
};

/*
 * Suspend/resume handler for the old PM scheme (APM)
 */
static int i8042_pm_callback(struct pm_dev *dev, pm_request_t request, void *dummy)
{
	switch (request) {
		case PM_SUSPEND:
			return i8042_controller_suspend();

		case PM_RESUME:
			return i8042_controller_resume();
	}

	return 0;
}

static void __init i8042_init_mux_values(struct i8042_values *values, struct serio *port, int index)
{
	memcpy(port, &i8042_aux_port, sizeof(struct serio));
	memcpy(values, &i8042_aux_values, sizeof(struct i8042_values));
	sprintf(i8042_mux_names[index], "i8042 Aux-%d Port", index);
	sprintf(i8042_mux_phys[index], I8042_MUX_PHYS_DESC, index + 1);
	sprintf(i8042_mux_short[index], "AUX%d", index);
	port->name = i8042_mux_names[index];
	port->phys = i8042_mux_phys[index];
	port->driver = values;
	values->name = i8042_mux_short[index];
	values->mux = index;
}

int __init i8042_init(void)
{
	int i;

	dbg_init();

	init_timer(&i8042_timer);
	i8042_timer.function = i8042_timer_func;

	if (i8042_platform_init())
		return -EBUSY;

	i8042_aux_values.irq = I8042_AUX_IRQ;
	i8042_kbd_values.irq = I8042_KBD_IRQ;

	if (i8042_controller_init())
		return -ENODEV;

	if (i8042_dumbkbd)
		i8042_kbd_port.write = NULL;

	if (!i8042_noaux && !i8042_check_aux(&i8042_aux_values)) {
		if (!i8042_nomux && !i8042_check_mux(&i8042_aux_values))
			for (i = 0; i < 4; i++) {
				i8042_init_mux_values(i8042_mux_values + i, i8042_mux_port + i, i);
				i8042_port_register(i8042_mux_values + i, i8042_mux_port + i);
			}
		else
			i8042_port_register(&i8042_aux_values, &i8042_aux_port);
	}

	i8042_port_register(&i8042_kbd_values, &i8042_kbd_port);

	mod_timer(&i8042_timer, jiffies + I8042_POLL_PERIOD);

        if (sysdev_class_register(&kbc_sysclass) == 0) {
                if (sysdev_register(&device_i8042) == 0)
			i8042_sysdev_initialized = 1;
		else
			sysdev_class_unregister(&kbc_sysclass);
        }

	i8042_pm_dev = pm_register(PM_SYS_DEV, PM_SYS_UNKNOWN, i8042_pm_callback);

	register_reboot_notifier(&i8042_notifier);

	return 0;
}

void __exit i8042_exit(void)
{
	int i;

	unregister_reboot_notifier(&i8042_notifier);

	if (i8042_pm_dev)
		pm_unregister(i8042_pm_dev);

	if (i8042_sysdev_initialized) {
		sysdev_unregister(&device_i8042);
		sysdev_class_unregister(&kbc_sysclass);
	}

	i8042_controller_cleanup();

	if (i8042_kbd_values.exists)
		serio_unregister_port(&i8042_kbd_port);

	if (i8042_aux_values.exists)
		serio_unregister_port(&i8042_aux_port);

	for (i = 0; i < 4; i++)
		if (i8042_mux_values[i].exists)
			serio_unregister_port(i8042_mux_port + i);
	del_timer_sync(&i8042_timer);

	i8042_platform_exit();
}

module_init(i8042_init);
module_exit(i8042_exit);