Hi,
On mer, 2010-01-27 at 18:03 +0100, Lothar Wa?mann wrote:

Hi,

Alberto Panizzo writes:

quoted

On mer, 2010-01-27 at 15:52 +0100, Lothar Wa?mann wrote:

quoted

Hi,

Alberto Panizzo writes:

quoted

On mer, 2010-01-27 at 13:18 +0100, Lothar Wa?mann wrote:

quoted

Hi,

Alberto Panizzo writes:

quoted

quoted

quoted

+	irq = platform_get_irq(pdev, 0);
+	if (irq < 0) {
+		dev_err(&pdev->dev, "failed to get keypad irq\n");
+		return -ENXIO;
+	}

This should be -ENODEV.

Lot of reference keyboard driver use -ENXIO..
May should be better: return irq ?

Yes, of course. If a function returns an error code that should be
promoted to the caller instead of inventing a new error code.


Lothar Wa?mann

But, errno.h say:
#define ENXIO           6                // Device not configured
#define ENODEV          19               // Operation not supported by device

What errno.h file is that?
I have:
./include/asm-generic/errno-base.h:#define      ENXIO            6      /* No such device or address */
./include/asm-generic/errno-base.h:#define      ENODEV          19      /* No such device */

AFAIK ENXIO is used when actual I/O has been attempted. But in this
case the driver is still being configured and did not do any I/O yet.


Lothar Wa?mann

The errno.h that I propose is a googled one and the kernel-one do not explain well..
Not for fighting, I wont understand.

In drivers/base/platform.c:

/**
 * platform_get_irq - get an IRQ for a device
 * @dev: platform device
 * @num: IRQ number index
 */
int platform_get_irq(struct platform_device *dev, unsigned int num)
{
	struct resource *r = platform_get_resource(dev, IORESOURCE_IRQ, num);

	return r ? r->start : -ENXIO;
}

If there isn't the irq resource asked platform_get_irq return ENXIO.

The POSIX spec says:
|[ENXIO]
|    No such device or address. Input or output on a special file
|refers to a device that does not exist, or makes a request beyond the
|capabilities of the device. It may also occur when, for example, a
|tape drive is not on-line. 

And I am not doing any I/O, while I am requesting something that is beyond
the capability defined in platform_data.

While 
|[ENODEV]
|  No such device. An attempt was made to apply an inappropriate function 
|to a device; for example, trying to read a write-only device such as a printer.

And:
-the device is present (registered in the driver model) 
-I am not trying to apply an inappropriate function.. 

Maybe the problem have to be attacked form another point of view:
Platform resources are parameters of the driver, the absence of IRQ and IO mem
would be considered as wrong parameters so the error should be EINVAL.

http://www.opengroup.org/onlinepubs/000095399/functions/xsh_chap02_03.html

Bookmarked!!!! :)