Input: q40kbd - convert driver to the split model

Convert the driver to standard spilt model arch-specific code registers
platform device to which driver code can bind later.

Also request IRQ immediately upon binding to the device instead of doing
this when serio port is being opened.

Acked-by: Geert Uytterhoeven <[e-mail]>
Signed-off-by: Dmitry Torokhov <[e-mail]>

arch/m68k/q40/config.c

···
 #include <linux/rtc.h>
 #include <linux/vt_kern.h>
 #include <linux/bcd.h>
+#include <linux/platform_device.h>
 
 #include <asm/io.h>
 #include <asm/rtc.h>
···
 	} else
 		return -EINVAL;
 }
+
+static __init int q40_add_kbd_device(void)
+{
+	struct platform_device *pdev;
+
+	pdev = platform_device_register_simple("q40kbd", -1, NULL, 0);
+	if (IS_ERR(pdev))
+		return PTR_ERR(pdev);
+
+	return 0;
+}
+arch_initcall(q40_add_kbd_device);

drivers/input/serio/q40kbd.c

···
 #include <asm/irq.h>
 #include <asm/q40ints.h>
 
+#define DRV_NAME	"q40kbd"
+
 MODULE_AUTHOR("Vojtech Pavlik <[e-mail]>");
 MODULE_DESCRIPTION("Q40 PS/2 keyboard controller driver");
 MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:" DRV_NAME);
 
-static DEFINE_SPINLOCK(q40kbd_lock);
-static struct serio *q40kbd_port;
-static struct platform_device *q40kbd_device;
+struct q40kbd {
+	struct serio *port;
+	spinlock_t lock;
+};
 
 static irqreturn_t q40kbd_interrupt(int irq, void *dev_id)
 {
+	struct q40kbd *q40kbd = dev_id;
 	unsigned long flags;
 
-	spin_lock_irqsave(&q40kbd_lock, flags);
+	spin_lock_irqsave(&q40kbd->lock, flags);
 
 	if (Q40_IRQ_KEYB_MASK & master_inb(INTERRUPT_REG))
-		serio_interrupt(q40kbd_port, master_inb(KEYCODE_REG), 0);
+		serio_interrupt(q40kbd->port, master_inb(KEYCODE_REG), 0);
 
 	master_outb(-1, KEYBOARD_UNLOCK_REG);
 
-	spin_unlock_irqrestore(&q40kbd_lock, flags);
+	spin_unlock_irqrestore(&q40kbd->lock, flags);
 
 	return IRQ_HANDLED;
 }
···
  * q40kbd_flush() flushes all data that may be in the keyboard buffers
  */
 
-static void q40kbd_flush(void)
+static void q40kbd_flush(struct q40kbd *q40kbd)
 {
 	int maxread = 100;
 	unsigned long flags;
 
-	spin_lock_irqsave(&q40kbd_lock, flags);
+	spin_lock_irqsave(&q40kbd->lock, flags);
 
 	while (maxread-- && (Q40_IRQ_KEYB_MASK & master_inb(INTERRUPT_REG)))
 		master_inb(KEYCODE_REG);
 
-	spin_unlock_irqrestore(&q40kbd_lock, flags);
+	spin_unlock_irqrestore(&q40kbd->lock, flags);
+}
+
+static void q40kbd_stop(void)
+{
+	master_outb(0, KEY_IRQ_ENABLE_REG);
+	master_outb(-1, KEYBOARD_UNLOCK_REG);
 }
 
 /*
···
 
 static int q40kbd_open(struct serio *port)
 {
-	q40kbd_flush();
+	struct q40kbd *q40kbd = port->port_data;
 
-	if (request_irq(Q40_IRQ_KEYBOARD, q40kbd_interrupt, 0, "q40kbd", NULL)) {
-		printk(KERN_ERR "q40kbd.c: Can't get irq %d.\n", Q40_IRQ_KEYBOARD);
-		return -EBUSY;
-	}
+	q40kbd_flush(q40kbd);
 
 	/* off we go */
 	master_outb(-1, KEYBOARD_UNLOCK_REG);
···
 
 static void q40kbd_close(struct serio *port)
 {
-	master_outb(0, KEY_IRQ_ENABLE_REG);
-	master_outb(-1, KEYBOARD_UNLOCK_REG);
-	free_irq(Q40_IRQ_KEYBOARD, NULL);
+	struct q40kbd *q40kbd = port->port_data;
 
-	q40kbd_flush();
+	q40kbd_stop();
+	q40kbd_flush(q40kbd);
 }
 
-static int __devinit q40kbd_probe(struct platform_device *dev)
+static int __devinit q40kbd_probe(struct platform_device *pdev)
 {
-	q40kbd_port = kzalloc(sizeof(struct serio), GFP_KERNEL);
-	if (!q40kbd_port)
-		return -ENOMEM;
+	struct q40kbd *q40kbd;
+	struct serio *port;
+	int error;
 
-	q40kbd_port->id.type	= SERIO_8042;
-	q40kbd_port->open	= q40kbd_open;
-	q40kbd_port->close	= q40kbd_close;
-	q40kbd_port->dev.parent	= &dev->dev;
-	strlcpy(q40kbd_port->name, "Q40 Kbd Port", sizeof(q40kbd_port->name));
-	strlcpy(q40kbd_port->phys, "Q40", sizeof(q40kbd_port->phys));
+	q40kbd = kzalloc(sizeof(struct q40kbd), GFP_KERNEL);
+	port = kzalloc(sizeof(struct serio), GFP_KERNEL);
+	if (!q40kbd || !port) {
+		error = -ENOMEM;
+		goto err_free_mem;
+	}
 
-	serio_register_port(q40kbd_port);
+	q40kbd->port = port;
+	spin_lock_init(&q40kbd->lock);
+
+	port->id.type = SERIO_8042;
+	port->open = q40kbd_open;
+	port->close = q40kbd_close;
+	port->port_data = q40kbd;
+	port->dev.parent = &pdev->dev;
+	strlcpy(port->name, "Q40 Kbd Port", sizeof(port->name));
+	strlcpy(port->phys, "Q40", sizeof(port->phys));
+
+	q40kbd_stop();
+
+	error = request_irq(Q40_IRQ_KEYBOARD, q40kbd_interrupt, 0,
+			    DRV_NAME, q40kbd);
+	if (error) {
+		dev_err(&pdev->dev, "Can't get irq %d.\n", Q40_IRQ_KEYBOARD);
+		goto err_free_mem;
+	}
+
+	serio_register_port(q40kbd->port);
+
+	platform_set_drvdata(pdev, q40kbd);
 	printk(KERN_INFO "serio: Q40 kbd registered\n");
 
 	return 0;
+
+err_free_mem:
+	kfree(port);
+	kfree(q40kbd);
+	return error;
 }
 
-static int __devexit q40kbd_remove(struct platform_device *dev)
+static int __devexit q40kbd_remove(struct platform_device *pdev)
 {
-	serio_unregister_port(q40kbd_port);
+	struct q40kbd *q40kbd = platform_get_drvdata(pdev);
 
+	/*
+	 * q40kbd_close() will be called as part of unregistering
+	 * and will ensure that IRQ is turned off, so it is safe
+	 * to unregister port first and free IRQ later.
+	 */
+	serio_unregister_port(q40kbd->port);
+	free_irq(Q40_IRQ_KEYBOARD, q40kbd);
+	kfree(q40kbd);
+
+	platform_set_drvdata(pdev, NULL);
 	return 0;
 }
 
···
 		.name	= "q40kbd",
 		.owner	= THIS_MODULE,
 	},
-	.probe		= q40kbd_probe,
 	.remove		= __devexit_p(q40kbd_remove),
 };
 
 static int __init q40kbd_init(void)
 {
-	int error;
-
-	if (!MACH_IS_Q40)
-		return -ENODEV;
-
-	error = platform_driver_register(&q40kbd_driver);
-	if (error)
-		return error;
-
-	q40kbd_device = platform_device_alloc("q40kbd", -1);
-	if (!q40kbd_device)
-		goto err_unregister_driver;
-
-	error = platform_device_add(q40kbd_device);
-	if (error)
-		goto err_free_device;
-
-	return 0;
-
- err_free_device:
-	platform_device_put(q40kbd_device);
- err_unregister_driver:
-	platform_driver_unregister(&q40kbd_driver);
-	return error;
+	return platform_driver_probe(&q40kbd_driver, q40kbd_probe);
 }
 
 static void __exit q40kbd_exit(void)
 {
-	platform_device_unregister(q40kbd_device);
 	platform_driver_unregister(&q40kbd_driver);
 }