[PATCH/RFT] tlclk: convert to the new platform device interface

[PATCH/RFT] tlclk: convert to the new platform device interface

[Dmitry Torokhov]

tlclk: convert to the new platform device interface

Do not use platform_device_register_simple() as it is going away,
define dcdbas_driver and implement ->probe() and ->remove() functions
so manual binding and unbinding will work with this driver.

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

 drivers/char/tlclk.c |  143 +++++++++++++++++++++++++++++++--------------------
 1 files changed, 89 insertions(+), 54 deletions(-)

Index: work/drivers/char/tlclk.c
===================================================================
--- work.orig/drivers/char/tlclk.c
+++ work/drivers/char/tlclk.c
@@ -202,6 +202,10 @@ static int tlclk_open(struct inode *inod
 {
 	int result;
 
+	alarm_events = kzalloc(sizeof(struct tlclk_alarms), GFP_KERNEL);
+	if (!alarm_events)
+		return -ENOMEM;
+
 	/* Make sure there is no interrupt pending while
 	 * initialising interrupt handler */
 	inb(TLCLK_REG6);
@@ -212,6 +216,8 @@ static int tlclk_open(struct inode *inod
 			     SA_INTERRUPT, "telco_clock", tlclk_interrupt);
 	if (result == -EBUSY) {
 		printk(KERN_ERR "telco_clock: Interrupt can't be reserved!\n");
+		kfree(alarm_events);
+		alarm_events = NULL;
 		return -EBUSY;
 	}
 	inb(TLCLK_REG6);	/* Clear interrupt events */
@@ -222,6 +228,9 @@ static int tlclk_open(struct inode *inod
 static int tlclk_release(struct inode *inode, struct file *filp)
 {
 	free_irq(telclk_interrupt, tlclk_interrupt);
+	del_timer_sync(&switchover_timer);
+	kfree(alarm_events);
+	alarm_events = NULL;
 
 	return 0;
 }
@@ -733,89 +742,115 @@ static struct attribute_group tlclk_attr
 	.attrs = tlclk_sysfs_entries,
 };
 
-static struct platform_device *tlclk_device;
-
-static int __init tlclk_init(void)
+static int __devinit tlclk_probe(struct platform_device *dev)
 {
-	int ret;
+	int error;
 
-	ret = register_chrdev(tlclk_major, "telco_clock", &tlclk_fops);
-	if (ret < 0) {
+	init_timer(&switchover_timer);
+
+	error = register_chrdev(tlclk_major, "telco_clock", &tlclk_fops);
+	if (error < 0) {
 		printk(KERN_ERR "telco_clock: can't get major! %d\n", tlclk_major);
-		return ret;
+		return error;
 	}
-	alarm_events = kzalloc( sizeof(struct tlclk_alarms), GFP_KERNEL);
-	if (!alarm_events)
-		goto out1;
+
+	error = misc_register(&tlclk_miscdev);
+	if (error < 0) {
+		printk(KERN_ERR "tlclk: misc_register retruns %d\n", error);
+		goto err_unregister_chrdev;
+	}
+
+	error = sysfs_create_group(&dev->dev.kobj, &tlclk_attribute_group);
+	if (error) {
+		printk(KERN_ERR
+			"tlclk: failed to create sysfs device attributes\n");
+		goto err_misc_deregister;
+	}
+
+	return 0;
+
+ err_misc_deregister:
+	misc_deregister(&tlclk_miscdev);
+ err_unregister_chrdev:
+	unregister_chrdev(tlclk_major, "telco_clock");
+	return error;
+}
+
+static int __devexit tlclk_remove(struct platform_device *dev)
+{
+	sysfs_remove_group(&dev->dev.kobj, &tlclk_attribute_group);
+	misc_deregister(&tlclk_miscdev);
+	unregister_chrdev(tlclk_major, "telco_clock");
+
+	return 0;
+}
+
+static struct platform_driver tlclk_driver = {
+	.driver		= {
+		.name	= "telco_clock",
+		.owner	= THIS_MODULE,
+	},
+	.probe		= tlclk_probe,
+	.remove		= __devexit_p(tlclk_remove),
+};
+
+static struct platform_device *tlclk_device;
+
+static int __init tlclk_init(void)
+{
+	int error;
 
 	/* Read telecom clock IRQ number (Set by BIOS) */
 	if (!request_region(TLCLK_BASE, 8, "telco_clock")) {
 		printk(KERN_ERR "tlclk: request_region failed! 0x%X\n",
 			TLCLK_BASE);
-		ret = -EBUSY;
-		goto out2;
+		return -EBUSY;
 	}
-	telclk_interrupt = (inb(TLCLK_REG7) & 0x0f);
 
-	if (0x0F == telclk_interrupt ) { /* not MCPBL0010 ? */
-		printk(KERN_ERR "telclk_interrup = 0x%x non-mcpbl0010 hw\n",
+	telclk_interrupt = (inb(TLCLK_REG7) & 0x0f);
+	if (0x0F == telclk_interrupt) { /* not MCPBL0010 ? */
+		printk(KERN_ERR
+			"tlclk: telclk_interrupt = 0x%x non-mcpbl0010 hw\n",
 			telclk_interrupt);
-		ret = -ENXIO;
-		goto out3;
+		error = -ENODEV;
+		goto err_release_region;
 	}
 
-	init_timer(&switchover_timer);
-
-	ret = misc_register(&tlclk_miscdev);
-	if (ret < 0) {
-		printk(KERN_ERR " misc_register retruns %d\n", ret);
-		ret = -EBUSY;
-		goto out3;
+	error = platform_driver_register(&tlclk_driver);
+	if (error) {
+		printk(KERN_ERR "tlclk: failed to register platform driver\n");
+		goto err_free_device;
 	}
 
-	tlclk_device = platform_device_register_simple("telco_clock",
-				-1, NULL, 0);
+	tlclk_device = platform_device_alloc("telco_clock", -1);
 	if (!tlclk_device) {
-		printk(KERN_ERR " platform_device_register retruns 0x%X\n",
-			(unsigned int) tlclk_device);
-		ret = -EBUSY;
-		goto out4;
+		printk(KERN_ERR "tlclk: failed to allocate platform device\n");
+		error = -ENOMEM;
+		goto err_unregister_driver;
 	}
 
-	ret = sysfs_create_group(&tlclk_device->dev.kobj,
-			&tlclk_attribute_group);
-	if (ret) {
-		printk(KERN_ERR "failed to create sysfs device attributes\n");
-		sysfs_remove_group(&tlclk_device->dev.kobj,
-			&tlclk_attribute_group);
-		goto out5;
+	error = platform_device_add(tlclk_device);
+	if (error) {
+		printk(KERN_ERR "tlclk: failed to register platform device\n");
+		goto err_free_device;
 	}
 
 	return 0;
-out5:
-	platform_device_unregister(tlclk_device);
-out4:
-	misc_deregister(&tlclk_miscdev);
-out3:
+
+ err_free_device:
+	platform_device_put(tlclk_device);
+ err_unregister_driver:
+	platform_driver_unregister(&tlclk_driver);
+ err_release_region:
 	release_region(TLCLK_BASE, 8);
-out2:
-	kfree(alarm_events);
-out1:
-	unregister_chrdev(tlclk_major, "telco_clock");
-	return ret;
+	return error;
 }
 
 static void __exit tlclk_cleanup(void)
 {
-	sysfs_remove_group(&tlclk_device->dev.kobj, &tlclk_attribute_group);
 	platform_device_unregister(tlclk_device);
-	misc_deregister(&tlclk_miscdev);
-	unregister_chrdev(tlclk_major, "telco_clock");
-
+	platform_driver_unregister(&tlclk_driver);
 	release_region(TLCLK_BASE, 8);
-	del_timer_sync(&switchover_timer);
-	kfree(alarm_events);
-
 }
 
 static void switchover_timeout(unsigned long data)

RE: [PATCH/RFT] tlclk: convert to the new platform device interface

[Gross, Mark]

The patch "looks" ok, but I have two issues:

2.6.15-rc6, hangs on the udev startup on my RHEL4 system so I can't
smoke test this and more importantly an errata update patch I sent out
earlier didn't make it in.  (I was having email client issues with kmail
changing tabs to spaces on me that day so it may be my fault that patch
got dropped.)

How would you like to proceed?
1) Should I send out an update patch that includes yours and the errata
patch, knowing that we can only say that it compiles.
2) Should I send a unit tested errata patch to a 2.6.14.latest version?
3) Both 1 and 2?
4) Just ack your patch (I did review it and it compiles and looks fine)
and re-submit my errata changes on top of your update?

Thanks,

--mgross


-----Original Message-----
From: Dmitry Torokhov [mailto:dtor_core@ameritech.net] 
Sent: Thursday, December 15, 2005 10:56 PM
To: LKML
Cc: Russell King; Al Viro; torvalds@osdl.org; Gross, Mark
Subject: [PATCH/RFT] tlclk: convert to the new platform device interface

tlclk: convert to the new platform device interface

Do not use platform_device_register_simple() as it is going away,
define dcdbas_driver and implement ->probe() and ->remove() functions
so manual binding and unbinding will work with this driver.

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

 drivers/char/tlclk.c |  143
+++++++++++++++++++++++++++++++--------------------
 1 files changed, 89 insertions(+), 54 deletions(-)

Index: work/drivers/char/tlclk.c
===================================================================
--- work.orig/drivers/char/tlclk.c
+++ work/drivers/char/tlclk.c
@@ -202,6 +202,10 @@ static int tlclk_open(struct inode *inod
 {
 	int result;
 
+	alarm_events = kzalloc(sizeof(struct tlclk_alarms), GFP_KERNEL);
+	if (!alarm_events)
+		return -ENOMEM;
+
 	/* Make sure there is no interrupt pending while
 	 * initialising interrupt handler */
 	inb(TLCLK_REG6);
@@ -212,6 +216,8 @@ static int tlclk_open(struct inode *inod
 			     SA_INTERRUPT, "telco_clock",
tlclk_interrupt);
 	if (result == -EBUSY) {
 		printk(KERN_ERR "telco_clock: Interrupt can't be
reserved!\n");
+		kfree(alarm_events);
+		alarm_events = NULL;
 		return -EBUSY;
 	}
 	inb(TLCLK_REG6);	/* Clear interrupt events */
@@ -222,6 +228,9 @@ static int tlclk_open(struct inode *inod
 static int tlclk_release(struct inode *inode, struct file *filp)
 {
 	free_irq(telclk_interrupt, tlclk_interrupt);
+	del_timer_sync(&switchover_timer);
+	kfree(alarm_events);
+	alarm_events = NULL;
 
 	return 0;
 }
@@ -733,89 +742,115 @@ static struct attribute_group tlclk_attr
 	.attrs = tlclk_sysfs_entries,
 };
 
-static struct platform_device *tlclk_device;
-
-static int __init tlclk_init(void)
+static int __devinit tlclk_probe(struct platform_device *dev)
 {
-	int ret;
+	int error;
 
-	ret = register_chrdev(tlclk_major, "telco_clock", &tlclk_fops);
-	if (ret < 0) {
+	init_timer(&switchover_timer);
+
+	error = register_chrdev(tlclk_major, "telco_clock",
&tlclk_fops);
+	if (error < 0) {
 		printk(KERN_ERR "telco_clock: can't get major! %d\n",
tlclk_major);
-		return ret;
+		return error;
 	}
-	alarm_events = kzalloc( sizeof(struct tlclk_alarms),
GFP_KERNEL);
-	if (!alarm_events)
-		goto out1;
+
+	error = misc_register(&tlclk_miscdev);
+	if (error < 0) {
+		printk(KERN_ERR "tlclk: misc_register retruns %d\n",
error);
+		goto err_unregister_chrdev;
+	}
+
+	error = sysfs_create_group(&dev->dev.kobj,
&tlclk_attribute_group);
+	if (error) {
+		printk(KERN_ERR
+			"tlclk: failed to create sysfs device
attributes\n");
+		goto err_misc_deregister;
+	}
+
+	return 0;
+
+ err_misc_deregister:
+	misc_deregister(&tlclk_miscdev);
+ err_unregister_chrdev:
+	unregister_chrdev(tlclk_major, "telco_clock");
+	return error;
+}
+
+static int __devexit tlclk_remove(struct platform_device *dev)
+{
+	sysfs_remove_group(&dev->dev.kobj, &tlclk_attribute_group);
+	misc_deregister(&tlclk_miscdev);
+	unregister_chrdev(tlclk_major, "telco_clock");
+
+	return 0;
+}
+
+static struct platform_driver tlclk_driver = {
+	.driver		= {
+		.name	= "telco_clock",
+		.owner	= THIS_MODULE,
+	},
+	.probe		= tlclk_probe,
+	.remove		= __devexit_p(tlclk_remove),
+};
+
+static struct platform_device *tlclk_device;
+
+static int __init tlclk_init(void)
+{
+	int error;
 
 	/* Read telecom clock IRQ number (Set by BIOS) */
 	if (!request_region(TLCLK_BASE, 8, "telco_clock")) {
 		printk(KERN_ERR "tlclk: request_region failed! 0x%X\n",
 			TLCLK_BASE);
-		ret = -EBUSY;
-		goto out2;
+		return -EBUSY;
 	}
-	telclk_interrupt = (inb(TLCLK_REG7) & 0x0f);
 
-	if (0x0F == telclk_interrupt ) { /* not MCPBL0010 ? */
-		printk(KERN_ERR "telclk_interrup = 0x%x non-mcpbl0010
hw\n",
+	telclk_interrupt = (inb(TLCLK_REG7) & 0x0f);
+	if (0x0F == telclk_interrupt) { /* not MCPBL0010 ? */
+		printk(KERN_ERR
+			"tlclk: telclk_interrupt = 0x%x non-mcpbl0010
hw\n",
 			telclk_interrupt);
-		ret = -ENXIO;
-		goto out3;
+		error = -ENODEV;
+		goto err_release_region;
 	}
 
-	init_timer(&switchover_timer);
-
-	ret = misc_register(&tlclk_miscdev);
-	if (ret < 0) {
-		printk(KERN_ERR " misc_register retruns %d\n", ret);
-		ret = -EBUSY;
-		goto out3;
+	error = platform_driver_register(&tlclk_driver);
+	if (error) {
+		printk(KERN_ERR "tlclk: failed to register platform
driver\n");
+		goto err_free_device;
 	}
 
-	tlclk_device = platform_device_register_simple("telco_clock",
-				-1, NULL, 0);
+	tlclk_device = platform_device_alloc("telco_clock", -1);
 	if (!tlclk_device) {
-		printk(KERN_ERR " platform_device_register retruns
0x%X\n",
-			(unsigned int) tlclk_device);
-		ret = -EBUSY;
-		goto out4;
+		printk(KERN_ERR "tlclk: failed to allocate platform
device\n");
+		error = -ENOMEM;
+		goto err_unregister_driver;
 	}
 
-	ret = sysfs_create_group(&tlclk_device->dev.kobj,
-			&tlclk_attribute_group);
-	if (ret) {
-		printk(KERN_ERR "failed to create sysfs device
attributes\n");
-		sysfs_remove_group(&tlclk_device->dev.kobj,
-			&tlclk_attribute_group);
-		goto out5;
+	error = platform_device_add(tlclk_device);
+	if (error) {
+		printk(KERN_ERR "tlclk: failed to register platform
device\n");
+		goto err_free_device;
 	}
 
 	return 0;
-out5:
-	platform_device_unregister(tlclk_device);
-out4:
-	misc_deregister(&tlclk_miscdev);
-out3:
+
+ err_free_device:
+	platform_device_put(tlclk_device);
+ err_unregister_driver:
+	platform_driver_unregister(&tlclk_driver);
+ err_release_region:
 	release_region(TLCLK_BASE, 8);
-out2:
-	kfree(alarm_events);
-out1:
-	unregister_chrdev(tlclk_major, "telco_clock");
-	return ret;
+	return error;
 }
 
 static void __exit tlclk_cleanup(void)
 {
-	sysfs_remove_group(&tlclk_device->dev.kobj,
&tlclk_attribute_group);
 	platform_device_unregister(tlclk_device);
-	misc_deregister(&tlclk_miscdev);
-	unregister_chrdev(tlclk_major, "telco_clock");
-
+	platform_driver_unregister(&tlclk_driver);
 	release_region(TLCLK_BASE, 8);
-	del_timer_sync(&switchover_timer);
-	kfree(alarm_events);
-
 }
 
 static void switchover_timeout(unsigned long data)

Re: [PATCH/RFT] tlclk: convert to the new platform device interface

[Dmitry Torokhov]

On Friday 23 December 2005 14:14, Gross, Mark wrote:
> The patch "looks" ok, but I have two issues:
> 
> 2.6.15-rc6, hangs on the udev startup on my RHEL4 system so I can't
> smoke test this and more importantly an errata update patch I sent out
> earlier didn't make it in.  (I was having email client issues with kmail
> changing tabs to spaces on me that day so it may be my fault that patch
> got dropped.)
> 
> How would you like to proceed?
> 1) Should I send out an update patch that includes yours and the errata
> patch, knowing that we can only say that it compiles.
> 2) Should I send a unit tested errata patch to a 2.6.14.latest version?
> 3) Both 1 and 2?
> 4) Just ack your patch (I did review it and it compiles and looks fine)
> and re-submit my errata changes on top of your update?
> 

My patch can safely wait till 2.6.16 opens so there is no hurry. I'd suggest
trying to resolve udev issue first and getting the errata patch into 2.6.15
and only then taking care of mine.

I do not know how critical that errata patch is to get it in 2.6.14.y. 

-- 
Dmitry