[RFC] Convert pcspkr into platform device

[Dmitry Torokhov <dtor_core@ameritech.net>]

Hi,

The patch below converts pcspkr driver into a platform device. This allows
input_dev it created to have a parent but that's pretty much it. I wonder
it is makes any sense to do it...

-- 
Dmitry

Input: pcspkr - convert into platform device

Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
---

 drivers/input/misc/pcspkr.c |   60 +++++++++++++++++++++++++++++++++++++++++---
 1 files changed, 56 insertions(+), 4 deletions(-)

Index: work/drivers/input/misc/pcspkr.c
===================================================================
--- work.orig/drivers/input/misc/pcspkr.c
+++ work/drivers/input/misc/pcspkr.c
@@ -16,6 +16,7 @@
 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/input.h>
+#include <linux/platform_device.h>
 #include <asm/8253pit.h>
 #include <asm/io.h>
 
@@ -24,7 +25,7 @@ MODULE_DESCRIPTION("PC Speaker beeper dr
 MODULE_LICENSE("GPL");
 
 static struct input_dev *pcspkr_dev;
-
+static struct platform_device *pcspkr_platform_device;
 static DEFINE_SPINLOCK(i8253_beep_lock);
 
 static int pcspkr_event(struct input_dev *dev, unsigned int type, unsigned int code, int value)
@@ -64,11 +65,48 @@ static int pcspkr_event(struct input_dev
 	return 0;
 }
 
+static int pcspkr_suspend(struct platform_device *dev, pm_message_t state)
+{
+	pcspkr_event(NULL, EV_SND, SND_BELL, 0);
+
+	return 0;
+}
+
+static void pcspkr_shutdown(struct platform_device *dev)
+{
+	/* turn off the speaker */
+	pcspkr_event(NULL, EV_SND, SND_BELL, 0);
+}
+
+
+static struct platform_driver pcspkr_platform_driver = {
+	.driver		= {
+		.name	= "pcspkr",
+	},
+	.suspend	= pcspkr_suspend,
+	.shutdown	= pcspkr_shutdown,
+};
+
+
 static int __init pcspkr_init(void)
 {
+	int err;
+
+	err = platform_driver_register(&pcspkr_platform_driver);
+	if (err)
+		return err;
+
+	pcspkr_platform_device = platform_device_register_simple("pcspkr", -1, NULL, 0);
+	if (IS_ERR(pcspkr_platform_device)) {
+		err = PTR_ERR(pcspkr_platform_device);
+		goto err_unregister_driver;
+	}
+
 	pcspkr_dev = input_allocate_device();
-	if (!pcspkr_dev)
-		return -ENOMEM;
+	if (!pcspkr_dev) {
+		err = -ENOMEM;
+		goto err_unregister_device;
+	}
 
 	pcspkr_dev->name = "PC Speaker";
 	pcspkr_dev->phys = "isa0061/input0";
@@ -76,14 +114,26 @@ static int __init pcspkr_init(void)
 	pcspkr_dev->id.vendor = 0x001f;
 	pcspkr_dev->id.product = 0x0001;
 	pcspkr_dev->id.version = 0x0100;
+	pcspkr_dev->cdev.dev = &pcspkr_platform_device->dev;
 
 	pcspkr_dev->evbit[0] = BIT(EV_SND);
 	pcspkr_dev->sndbit[0] = BIT(SND_BELL) | BIT(SND_TONE);
 	pcspkr_dev->event = pcspkr_event;
 
-	input_register_device(pcspkr_dev);
+	err = input_register_device(pcspkr_dev);
+	if (err)
+		goto err_free_input_device;
 
 	return 0;
+
+ err_free_input_device:
+	input_free_device(pcspkr_dev);
+ err_unregister_device:
+	platform_device_unregister(pcspkr_platform_device);
+ err_unregister_driver:
+	platform_driver_unregister(&pcspkr_platform_driver);
+
+	return err;
 }
 
 static void __exit pcspkr_exit(void)
@@ -91,6 +141,8 @@ static void __exit pcspkr_exit(void)
         input_unregister_device(pcspkr_dev);
 	/* turn off the speaker */
 	pcspkr_event(NULL, EV_SND, SND_BELL, 0);
+	platform_device_unregister(pcspkr_platform_device);
+	platform_driver_unregister(&pcspkr_platform_driver);
 }
 
 module_init(pcspkr_init);