i8042.c

h内核

	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 serio *port)
{
	struct i8042_values *values = port->port_data;

	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)
{
	unsigned long flags;

/*
 * 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.
 */

	spin_lock_irqsave(&i8042_lock, flags);
	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");
	}
	spin_unlock_irqrestore(&i8042_lock, flags);

/*
 * 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;

/*
 * 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)
{
	unsigned char param;

/*
 * Reset the controller if requested.
 */

	if (i8042_reset)
		if (i8042_command(&param, I8042_CMD_CTL_TEST))
			printk(KERN_ERR "i8042.c: i8042 controller reset timeout.\n");

/*
 * Disable MUX mode if present.
 */

	if (i8042_mux_present)
		i8042_set_mux_mode(0, NULL);

/*
 * 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 < I8042_NUM_MUX_PORTS; i++)
		if (i8042_mux_values[i].exists)
			serio_cleanup(i8042_mux_port[i]);

	i8042_controller_reset();
}


static int blink_frequency = 500;
module_param_named(panicblink, blink_frequency, int, 0600);

/* Catch the case when the kbd interrupt is off */
#define DELAY do { mdelay(1); if (++delay > 10) return delay; } while(0)

/* Tell the user who may be running in X and not see the console that we have
   panic'ed. This is to distingush panics from "real" lockups.  */
static long i8042_panic_blink(long count)
{
	long delay = 0;
	static long last_blink;
	static char led;
	/* Roughly 1/2s frequency. KDB uses about 1s. Make sure it is
	   different. */
	if (!blink_frequency)
		return 0;
	if (count - last_blink < blink_frequency)
		return 0;
	led ^= 0x01 | 0x04;
	while (i8042_read_status() & I8042_STR_IBF)
		DELAY;
	i8042_write_data(0xed); /* set leds */
	DELAY;
	while (i8042_read_status() & I8042_STR_IBF)
		DELAY;
	DELAY;
	i8042_write_data(led);
	DELAY;
	last_blink = count;
	return delay;
}

#undef DELAY

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

static int i8042_suspend(struct device *dev, u32 state, u32 level)
{
	if (level == SUSPEND_DISABLE) {
		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_resume(struct device *dev, u32 level)
{
	int i;

	if (level != RESUME_ENABLE)
		return 0;

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

	if (i8042_mux_present)
		if (i8042_set_mux_mode(1, 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 < I8042_NUM_MUX_PORTS; 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);

	panic_blink = i8042_panic_blink;

	return 0;

}

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

static void i8042_shutdown(struct device *dev)
{
	i8042_controller_cleanup();
}

static struct device_driver i8042_driver = {
	.name		= "i8042",
	.bus		= &platform_bus_type,
	.suspend	= i8042_suspend,
	.resume		= i8042_resume,
	.shutdown	= i8042_shutdown,
};

static struct serio * __init i8042_allocate_kbd_port(void)
{
	struct serio *serio;

	serio = kmalloc(sizeof(struct serio), GFP_KERNEL);
	if (serio) {
		memset(serio, 0, sizeof(struct serio));
		serio->type		= i8042_direct ? SERIO_8042 : SERIO_8042_XL,
		serio->write		= i8042_dumbkbd ? NULL : i8042_kbd_write,
		serio->open		= i8042_open,
		serio->close		= i8042_close,
		serio->port_data	= &i8042_kbd_values,
		serio->dev.parent	= &i8042_platform_device->dev;
		strlcpy(serio->name, "i8042 Kbd Port", sizeof(serio->name));
		strlcpy(serio->phys, I8042_KBD_PHYS_DESC, sizeof(serio->phys));
	}

	return serio;
}

static struct serio * __init i8042_allocate_aux_port(void)
{
	struct serio *serio;

	serio = kmalloc(sizeof(struct serio), GFP_KERNEL);
	if (serio) {
		memset(serio, 0, sizeof(struct serio));
		serio->type		= SERIO_8042;
		serio->write		= i8042_aux_write;
		serio->open		= i8042_open;
		serio->close		= i8042_close;
		serio->port_data	= &i8042_aux_values,
		serio->dev.parent	= &i8042_platform_device->dev;
		strlcpy(serio->name, "i8042 Aux Port", sizeof(serio->name));
		strlcpy(serio->phys, I8042_AUX_PHYS_DESC, sizeof(serio->phys));
	}

	return serio;
}

static struct serio * __init i8042_allocate_mux_port(int index)
{
	struct serio *serio;
	struct i8042_values *values = &i8042_mux_values[index];

	serio = kmalloc(sizeof(struct serio), GFP_KERNEL);
	if (serio) {
		*values = i8042_aux_values;
		snprintf(values->name, sizeof(values->name), "AUX%d", index);
		values->mux = index;

		memset(serio, 0, sizeof(struct serio));
		serio->type		= SERIO_8042;
		serio->write		= i8042_aux_write;
		serio->open		= i8042_open;
		serio->close		= i8042_close;
		serio->port_data	= values;
		serio->dev.parent	= &i8042_platform_device->dev;
		snprintf(serio->name, sizeof(serio->name), "i8042 Aux-%d Port", index);
		snprintf(serio->phys, sizeof(serio->phys), I8042_MUX_PHYS_DESC, index + 1);
	}

	return serio;
}

int __init i8042_init(void)
{
	int i;
	int err;

	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;

	err = driver_register(&i8042_driver);
	if (err)
		return err;

	i8042_platform_device = platform_device_register_simple("i8042", -1, NULL, 0);
	if (IS_ERR(i8042_platform_device)) {
		driver_unregister(&i8042_driver);
		return PTR_ERR(i8042_platform_device);
	}

	if (!i8042_noaux && !i8042_check_aux(&i8042_aux_values)) {
		if (!i8042_nomux && !i8042_check_mux(&i8042_aux_values))
			for (i = 0; i < I8042_NUM_MUX_PORTS; i++) {
				i8042_mux_port[i] = i8042_allocate_mux_port(i);
				if (i8042_mux_port[i])
					i8042_port_register(i8042_mux_port[i]);
			}
		else {
			i8042_aux_port = i8042_allocate_aux_port();
			if (i8042_aux_port)
				i8042_port_register(i8042_aux_port);
		}
	}

	i8042_kbd_port = i8042_allocate_kbd_port();
	if (i8042_kbd_port)
		i8042_port_register(i8042_kbd_port);

	mod_timer(&i8042_timer, jiffies + I8042_POLL_PERIOD);

	return 0;
}

void __exit i8042_exit(void)
{
	int i;

	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 < I8042_NUM_MUX_PORTS; i++)
		if (i8042_mux_values[i].exists)
			serio_unregister_port(i8042_mux_port[i]);

	del_timer_sync(&i8042_timer);

	platform_device_unregister(i8042_platform_device);
	driver_unregister(&i8042_driver);

	i8042_platform_exit();

	panic_blink = NULL;
}

module_init(i8042_init);
module_exit(i8042_exit);