linux-kernel - Re: [PATCH V5 02/12] PNPACPI: use whilte list for pnpacpi device enumeration

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Date:	Mon, 28 Apr 2014 09:40:51 +0800
From:	Zhang Rui <rui.zhang@...el.com>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:	linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
	bhelgaas@...gle.com, matthew.garrett@...ula.com,
	rafael.j.wysocki@...el.com, dmitry.torokhov@...il.com
Subject: Re: [PATCH V5 02/12] PNPACPI: use whilte list for pnpacpi device
 enumeration

On Mon, 2014-04-28 at 00:01 +0200, Rafael J. Wysocki wrote:
> On Tuesday, April 08, 2014 12:06:49 AM Zhang Rui wrote:
> 
> [...]
> 
> > +
> > +static int acpi_pnp_scan_handler_attach(struct acpi_device *adev,
> > +					const struct acpi_device_id *id)
> > +{
> > +	return 1;
> > +}
> > +
> > +static int acpi_pnp_scan_handler_match(char *devid, char *handlerid)
> > +{
> > +	int i;
> > +
> > +	if (memcmp(devid, handlerid, 3))
> > +		return 0;
> > +
> > +	for (i = 3; i < 7; i++) {
> > +		/* Not a HEX value */
> > +		if (!((devid[i] >= '0' && devid[i] <= '9') ||
> > +		      (devid[i] > 'A' && devid[i] <= 'F')))
> > +			return 0;
> > +
> > +		if ((handlerid[i] != 'X') &&
> 
> Hmm.  What exactly is the above check for?
> 
PNP bus supports wildcard in the drivers' id list.
say, drivers/tty/serial/8250/8250_pnp.c
      {"WACFXXX"},            /* Wacom tablets */
means the driver wants to try to probe all the PNP devices start with
"WACF".

thanks,
rui
> > +		    toupper(devid[i]) != toupper(handlerid[i]))
> > +			return 0;
> > +	}
> > +	return 1;
> > +}
> > +
> > +static struct acpi_scan_handler acpi_pnp_handler = {
> > +	.ids = acpi_pnp_device_ids,
> > +	.match = acpi_pnp_scan_handler_match,
> > +	.attach = acpi_pnp_scan_handler_attach,
> > +};
> > +
> > +bool acpi_is_pnp_device(struct acpi_device *device)
> > +{
> > +	return device->handler == &acpi_pnp_handler;
> > +}
> > +EXPORT_SYMBOL_GPL(acpi_is_pnp_device);
> > +
> > +void __init acpi_pnp_init(void)
> > +{
> > +	acpi_scan_add_handler(&acpi_pnp_handler);
> > +}
> > diff --git a/drivers/acpi/internal.h b/drivers/acpi/internal.h
> 
> 


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