i8042.c

linux 内核源代码

 * used it for a PCI card or somethig else.
 */

	if (i8042_noloop || aux_loop_broken) {
/*
 * Without LOOP command we can't test AUX IRQ delivery. Assume the port
 * is working and hope we are right.
 */
		retval = 0;
		goto out;
	}

	if (request_irq(I8042_AUX_IRQ, i8042_aux_test_irq, IRQF_SHARED,
			"i8042", i8042_platform_device))
		goto out;

	irq_registered = 1;

	if (i8042_enable_aux_port())
		goto out;

	spin_lock_irqsave(&i8042_lock, flags);

	init_completion(&i8042_aux_irq_delivered);
	i8042_irq_being_tested = 1;

	param = 0xa5;
	retval = __i8042_command(&param, I8042_CMD_AUX_LOOP & 0xf0ff);

	spin_unlock_irqrestore(&i8042_lock, flags);

	if (retval)
		goto out;

	if (wait_for_completion_timeout(&i8042_aux_irq_delivered,
					msecs_to_jiffies(250)) == 0) {
/*
 * AUX IRQ was never delivered so we need to flush the controller to
 * get rid of the byte we put there; otherwise keyboard may not work.
 */
		i8042_flush();
		retval = -1;
	}

 out:

/*
 * Disable the interface.
 */

	i8042_ctr |= I8042_CTR_AUXDIS;
	i8042_ctr &= ~I8042_CTR_AUXINT;

	if (i8042_command(&i8042_ctr, I8042_CMD_CTL_WCTR))
		retval = -1;

	if (irq_registered)
		free_irq(I8042_AUX_IRQ, i8042_platform_device);

	return retval;
}

static int i8042_controller_check(void)
{
	if (i8042_flush() == I8042_BUFFER_SIZE) {
		printk(KERN_ERR "i8042.c: No controller found.\n");
		return -ENODEV;
	}

	return 0;
}

static int i8042_controller_selftest(void)
{
	unsigned char param;

	if (!i8042_reset)
		return 0;

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

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

	return 0;
}

/*
 * 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;

/*
 * 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 -EIO;
	}

	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 -EIO;
	}

	return 0;
}


/*
 * Reset the controller and reset CRT to the original value set by BIOS.
 */

static void i8042_controller_reset(void)
{
	i8042_flush();

/*
 * Disable both KBD and AUX interfaces so they don't get in the way
 */

	i8042_ctr |= I8042_CTR_KBDDIS | I8042_CTR_AUXDIS;
	i8042_ctr &= ~(I8042_CTR_KBDINT | I8042_CTR_AUXINT);

/*
 * Disable MUX mode if present.
 */

	if (i8042_mux_present)
		i8042_set_mux_mode(0, NULL);

/*
 * Reset the controller if requested.
 */

	i8042_controller_selftest();

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

	if (i8042_command(&i8042_initial_ctr, I8042_CMD_CTL_WCTR))
		printk(KERN_WARNING "i8042.c: Can't restore CTR.\n");
}


/*
 * i8042_panic_blink() will flash the keyboard LEDs and is called when
 * kernel panics. Flashing LEDs is useful for users running X who may
 * not see the console and will help distingushing panics from "real"
 * lockups.
 *
 * Note that DELAY has a limit of 10ms so we will not get stuck here
 * waiting for KBC to free up even if KBD interrupt is off
 */

#define DELAY do { mdelay(1); if (++delay > 10) return delay; } while(0)

static long i8042_panic_blink(long count)
{
	long delay = 0;
	static long last_blink;
	static char led;

	/*
	 * We expect frequency to be about 1/2s. KDB uses about 1s.
	 * Make sure they are different.
	 */
	if (!i8042_blink_frequency)
		return 0;
	if (count - last_blink < i8042_blink_frequency)
		return 0;

	led ^= 0x01 | 0x04;
	while (i8042_read_status() & I8042_STR_IBF)
		DELAY;
	dbg("%02x -> i8042 (panic blink)", 0xed);
	i8042_suppress_kbd_ack = 2;
	i8042_write_data(0xed); /* set leds */
	DELAY;
	while (i8042_read_status() & I8042_STR_IBF)
		DELAY;
	DELAY;
	dbg("%02x -> i8042 (panic blink)", led);
	i8042_write_data(led);
	DELAY;
	last_blink = count;
	return delay;
}

#undef DELAY

#ifdef CONFIG_PM
/*
 * Here we try to restore the original BIOS settings. We only want to
 * do that once, when we really suspend, not when we taking memory
 * snapshot for swsusp (in this case we'll perform required cleanup
 * as part of shutdown process).
 */

static int i8042_suspend(struct platform_device *dev, pm_message_t state)
{
	if (dev->dev.power.power_state.event != state.event) {
		if (state.event == PM_EVENT_SUSPEND)
			i8042_controller_reset();

		dev->dev.power.power_state = state;
	}

	return 0;
}


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

static int i8042_resume(struct platform_device *dev)
{
	int error;

/*
 * Do not bother with restoring state if we haven't suspened yet
 */
	if (dev->dev.power.power_state.event == PM_EVENT_ON)
		return 0;

	error = i8042_controller_check();
	if (error)
		return error;

	error = i8042_controller_selftest();
	if (error)
		return error;

/*
 * Restore original CTR value and disable all ports
 */

	i8042_ctr = i8042_initial_ctr;
	if (i8042_direct)
		i8042_ctr &= ~I8042_CTR_XLATE;
	i8042_ctr |= I8042_CTR_AUXDIS | I8042_CTR_KBDDIS;
	i8042_ctr &= ~(I8042_CTR_AUXINT | I8042_CTR_KBDINT);
	if (i8042_command(&i8042_ctr, I8042_CMD_CTL_WCTR)) {
		printk(KERN_ERR "i8042: Can't write CTR to resume\n");
		return -EIO;
	}

	if (i8042_mux_present) {
		if (i8042_set_mux_mode(1, NULL) || i8042_enable_mux_ports())
			printk(KERN_WARNING
				"i8042: failed to resume active multiplexor, "
				"mouse won't work.\n");
	} else if (i8042_ports[I8042_AUX_PORT_NO].serio)
		i8042_enable_aux_port();

	if (i8042_ports[I8042_KBD_PORT_NO].serio)
		i8042_enable_kbd_port();

	i8042_interrupt(0, NULL);

	dev->dev.power.power_state = PMSG_ON;

	return 0;
}
#endif /* CONFIG_PM */

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

static void i8042_shutdown(struct platform_device *dev)
{
	i8042_controller_reset();
}

static int __devinit i8042_create_kbd_port(void)
{
	struct serio *serio;
	struct i8042_port *port = &i8042_ports[I8042_KBD_PORT_NO];

	serio = kzalloc(sizeof(struct serio), GFP_KERNEL);
	if (!serio)
		return -ENOMEM;

	serio->id.type		= i8042_direct ? SERIO_8042 : SERIO_8042_XL;
	serio->write		= i8042_dumbkbd ? NULL : i8042_kbd_write;
	serio->start		= i8042_start;
	serio->stop		= i8042_stop;
	serio->port_data	= port;
	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));

	port->serio = serio;
	port->irq = I8042_KBD_IRQ;

	return 0;
}

static int __devinit i8042_create_aux_port(int idx)
{
	struct serio *serio;
	int port_no = idx < 0 ? I8042_AUX_PORT_NO : I8042_MUX_PORT_NO + idx;
	struct i8042_port *port = &i8042_ports[port_no];

	serio = kzalloc(sizeof(struct serio), GFP_KERNEL);
	if (!serio)
		return -ENOMEM;

	serio->id.type		= SERIO_8042;
	serio->write		= i8042_aux_write;
	serio->start		= i8042_start;
	serio->stop		= i8042_stop;
	serio->port_data	= port;
	serio->dev.parent	= &i8042_platform_device->dev;
	if (idx < 0) {
		strlcpy(serio->name, "i8042 AUX port", sizeof(serio->name));
		strlcpy(serio->phys, I8042_AUX_PHYS_DESC, sizeof(serio->phys));
	} else {
		snprintf(serio->name, sizeof(serio->name), "i8042 AUX%d port", idx);
		snprintf(serio->phys, sizeof(serio->phys), I8042_MUX_PHYS_DESC, idx + 1);
	}

	port->serio = serio;
	port->mux = idx;
	port->irq = I8042_AUX_IRQ;

	return 0;
}

static void __devinit i8042_free_kbd_port(void)
{
	kfree(i8042_ports[I8042_KBD_PORT_NO].serio);
	i8042_ports[I8042_KBD_PORT_NO].serio = NULL;
}

static void __devinit i8042_free_aux_ports(void)
{
	int i;

	for (i = I8042_AUX_PORT_NO; i < I8042_NUM_PORTS; i++) {
		kfree(i8042_ports[i].serio);
		i8042_ports[i].serio = NULL;
	}
}

static void __devinit i8042_register_ports(void)
{
	int i;

	for (i = 0; i < I8042_NUM_PORTS; i++) {
		if (i8042_ports[i].serio) {
			printk(KERN_INFO "serio: %s at %#lx,%#lx irq %d\n",
				i8042_ports[i].serio->name,
				(unsigned long) I8042_DATA_REG,
				(unsigned long) I8042_COMMAND_REG,
				i8042_ports[i].irq);
			serio_register_port(i8042_ports[i].serio);
		}
	}
}

static void __devexit i8042_unregister_ports(void)
{
	int i;

	for (i = 0; i < I8042_NUM_PORTS; i++) {
		if (i8042_ports[i].serio) {
			serio_unregister_port(i8042_ports[i].serio);
			i8042_ports[i].serio = NULL;
		}
	}
}

static void i8042_free_irqs(void)
{
	if (i8042_aux_irq_registered)
		free_irq(I8042_AUX_IRQ, i8042_platform_device);
	if (i8042_kbd_irq_registered)
		free_irq(I8042_KBD_IRQ, i8042_platform_device);

	i8042_aux_irq_registered = i8042_kbd_irq_registered = 0;
}

static int __devinit i8042_setup_aux(void)
{
	int (*aux_enable)(void);
	int error;
	int i;

	if (i8042_check_aux())
		return -ENODEV;

	if (i8042_nomux || i8042_check_mux()) {
		error = i8042_create_aux_port(-1);
		if (error)
			goto err_free_ports;
		aux_enable = i8042_enable_aux_port;
	} else {
		for (i = 0; i < I8042_NUM_MUX_PORTS; i++) {
			error = i8042_create_aux_port(i);
			if (error)
				goto err_free_ports;
		}
		aux_enable = i8042_enable_mux_ports;
	}

	error = request_irq(I8042_AUX_IRQ, i8042_interrupt, IRQF_SHARED,
			    "i8042", i8042_platform_device);
	if (error)
		goto err_free_ports;

	if (aux_enable())
		goto err_free_irq;

	i8042_aux_irq_registered = 1;
	return 0;

 err_free_irq:
	free_irq(I8042_AUX_IRQ, i8042_platform_device);
 err_free_ports:
	i8042_free_aux_ports();
	return error;
}

static int __devinit i8042_setup_kbd(void)
{
	int error;

	error = i8042_create_kbd_port();
	if (error)
		return error;

	error = request_irq(I8042_KBD_IRQ, i8042_interrupt, IRQF_SHARED,
			    "i8042", i8042_platform_device);
	if (error)
		goto err_free_port;

	error = i8042_enable_kbd_port();
	if (error)
		goto err_free_irq;

	i8042_kbd_irq_registered = 1;
	return 0;

 err_free_irq:
	free_irq(I8042_KBD_IRQ, i8042_platform_device);
 err_free_port:
	i8042_free_kbd_port();
	return error;
}

static int __devinit i8042_probe(struct platform_device *dev)
{
	int error;

	error = i8042_controller_selftest();
	if (error)
		return error;

	error = i8042_controller_init();
	if (error)
		return error;

	if (!i8042_noaux) {
		error = i8042_setup_aux();
		if (error && error != -ENODEV && error != -EBUSY)
			goto out_fail;
	}

	if (!i8042_nokbd) {
		error = i8042_setup_kbd();
		if (error)
			goto out_fail;
	}

/*
 * Ok, everything is ready, let's register all serio ports
 */
	i8042_register_ports();

	return 0;

 out_fail:
	i8042_free_aux_ports();	/* in case KBD failed but AUX not */
	i8042_free_irqs();
	i8042_controller_reset();

	return error;
}

static int __devexit i8042_remove(struct platform_device *dev)
{
	i8042_unregister_ports();
	i8042_free_irqs();
	i8042_controller_reset();

	return 0;
}

static struct platform_driver i8042_driver = {
	.driver		= {
		.name	= "i8042",
		.owner	= THIS_MODULE,
	},
	.probe		= i8042_probe,
	.remove		= __devexit_p(i8042_remove),
	.shutdown	= i8042_shutdown,
#ifdef CONFIG_PM
	.suspend	= i8042_suspend,
	.resume		= i8042_resume,
#endif
};

static int __init i8042_init(void)
{
	int err;

	dbg_init();

	err = i8042_platform_init();
	if (err)
		return err;

	err = i8042_controller_check();
	if (err)
		goto err_platform_exit;

	err = platform_driver_register(&i8042_driver);
	if (err)
		goto err_platform_exit;

	i8042_platform_device = platform_device_alloc("i8042", -1);
	if (!i8042_platform_device) {
		err = -ENOMEM;
		goto err_unregister_driver;
	}

	err = platform_device_add(i8042_platform_device);
	if (err)
		goto err_free_device;

	panic_blink = i8042_panic_blink;

	return 0;

 err_free_device:
	platform_device_put(i8042_platform_device);
 err_unregister_driver:
	platform_driver_unregister(&i8042_driver);
 err_platform_exit:
	i8042_platform_exit();

	return err;
}

static void __exit i8042_exit(void)
{
	platform_device_unregister(i8042_platform_device);
	platform_driver_unregister(&i8042_driver);
	i8042_platform_exit();

	panic_blink = NULL;
}

module_init(i8042_init);
module_exit(i8042_exit);