linux-kernel - Re: MODULE_DEVICE_TABLE(isapnp, ...) does nothing

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Message-ID: <s5h8wdxab2h.wl%tiwai@suse.de>
Date:	Mon, 23 Nov 2009 09:40:22 +0100
From:	Takashi Iwai <tiwai@...e.de>
To:	Rusty Russell <rusty@...tcorp.com.au>
Cc:	Ondrej Zary <linux@...nbow-software.org>,
	linux-kernel@...r.kernel.org,
	Jon Masters <jonathan@...masters.org>,
	Jaroslav Kysela <perex@...ex.cz>, Greg KH <gregkh@...e.de>,
	Kay Sievers <kay.sievers@...y.org>
Subject: Re: MODULE_DEVICE_TABLE(isapnp, ...) does nothing

At Mon, 23 Nov 2009 13:59:53 +1030,
Rusty Russell wrote:
> 
> On Mon, 23 Nov 2009 07:31:57 am Ondrej Zary wrote:
> > The problem is that 
> > scripts/mod/file2alias.c simply ignores isapnp.
> 
> AFAICT it always has, and noone has complained until now.  Perhaps something
> was still reading /lib/modules/`uname -r`/modules.isapnpmap?

I don't think modules.isapnpmap is needed again.
The question came from the fact that the isapnp device wasn't loaded
automatically.

But, I thought Kay already added isapnp support sometime ago, but it
didn't seem to get in...  Kay?


> Two things are required:
> 1) Modify file2alias to add aliases for isapnp.  This is pretty easy.
> 2) Expose the isapnp devices in sysfs where udev will match them up
>    (/sys/bus/isa/devices/<dev>/modalias I guess?)

There is non-pnp ISA bus, so I'm afraid "isa" may conflict.
I suppose "isapnp" would be a safer choice.


thanks,

Takashi

> The first patches would look something like these.  We could mangle the
> PNP names a-la ISAPNP_VENDOR/ISAPNP_DEVICE, but as long as the published
> modalias matches the file2alias result, it doesn't matter.
> 
> Jaroslav?  Greg?  Patches for sysfs welcome...
> 
> Thanks,
> Rusty.
> PS.  Jon, perhaps the new decade is a good time to kill modules.*map?
> 
> isapnp: move definitions to mod_devicetable.h so file2alias can reach them.
> 
> Signed-off-by: Rusty Russell <rusty@...tcorp.com.au>
> 
> diff --git a/include/linux/isapnp.h b/include/linux/isapnp.h
> --- a/include/linux/isapnp.h
> +++ b/include/linux/isapnp.h
> @@ -43,10 +43,10 @@
>   */
>  
>  #ifdef __KERNEL__
> +#include <linux/mod_devicetable.h>
>  
>  #define DEVICE_COUNT_COMPATIBLE 4
>  
> -#define ISAPNP_ANY_ID		0xffff
>  #define ISAPNP_CARD_DEVS	8
>  
>  #define ISAPNP_CARD_ID(_va, _vb, _vc, _device) \
> @@ -74,12 +74,6 @@ struct isapnp_card_id {
>  #define ISAPNP_DEVICE_SINGLE_END \
>  		.card_vendor = 0, .card_device = 0
>  
> -struct isapnp_device_id {
> -	unsigned short card_vendor, card_device;
> -	unsigned short vendor, function;
> -	unsigned long driver_data;	/* data private to the driver */
> -};
> -
>  #if defined(CONFIG_ISAPNP) || (defined(CONFIG_ISAPNP_MODULE) && defined(MODULE))
>  
>  #define __ISAPNP__
> diff --git a/include/linux/mod_devicetable.h b/include/linux/mod_devicetable.h
> --- a/include/linux/mod_devicetable.h
> +++ b/include/linux/mod_devicetable.h
> @@ -474,4 +474,11 @@ struct platform_device_id {
>  			__attribute__((aligned(sizeof(kernel_ulong_t))));
>  };
>  
> +#define ISAPNP_ANY_ID		0xffff
> +struct isapnp_device_id {
> +	unsigned short card_vendor, card_device;
> +	unsigned short vendor, function;
> +	kernel_ulong_t driver_data;	/* data private to the driver */
> +};
> +
>  #endif /* LINUX_MOD_DEVICETABLE_H */
> 
> 
> isapnp: put aliases in .modinfo so modinfo can find them.
> 
> Once isa devices publish a modalias field, I think udev should "Just Work".
> 
> Signed-off-by: Rusty Russell <rusty@...tcorp.com.au>
> 
> diff --git a/scripts/mod/file2alias.c b/scripts/mod/file2alias.c
> --- a/scripts/mod/file2alias.c
> +++ b/scripts/mod/file2alias.c
> @@ -727,6 +727,19 @@ static int do_platform_entry(const char 
>  	return 1;
>  }
>  
> +/* Format is: isa:cvNcdNvNfN */
> +static int do_isapnp_entry(const char *filename,
> +			   struct isapnp_device_id *id, char *alias)
> +{
> +	strcpy(alias, "isa:");
> +	ADD(alias, "cv", id->card_vendor != ISAPNP_ANY_ID, id->card_vendor);
> +	ADD(alias, "cd", id->card_device != ISAPNP_ANY_ID, id->card_device);
> +	ADD(alias, "v", id->vendor != ISAPNP_ANY_ID, id->vendor);
> +	ADD(alias, "f", id->function, id->function);
> +	add_wildcard(alias);
> +	return 1;
> +}
> +
>  /* Ignore any prefix, eg. some architectures prepend _ */
>  static inline int sym_is(const char *symbol, const char *name)
>  {
> @@ -874,6 +887,10 @@ void handle_moddevtable(struct module *m
>  		do_table(symval, sym->st_size,
>  			 sizeof(struct platform_device_id), "platform",
>  			 do_platform_entry, mod);
> +	else if (sym_is(symname, "__mod_isapnp_device_table"))
> +		do_table(symval, sym->st_size,
> +			 sizeof(struct isapnp_device_id), "isa",
> +			 do_isapnp_entry, mod);
>  	free(zeros);
>  }
>  
> 
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