Commit 0c81eed4 authored Feb 21, 2008 by Kay Sievers Committed by Greg Kroah-Hartman Apr 19, 2008

PNP: add all PNP card device id's as individual aliases



The current PNP combined card + devices module aliase can
never ever match anything, because these values are not available
all at the same time to request a module.

Instead of adding the combined alias, we add the device id's
all as individual aliases. Device id's are exported by the PNP
bus and can now properly used to request the loading of a
matching module.

The module snd-sbawe currently exports aliases, which can never
match anything:
  alias: pnp:cCTLXXXXdCTL0045dCTL0022*
  alias: pnp:cCTLXXXXdCTL0044dCTL0023*
  alias: pnp:cCTLXXXXdCTL0042dCTL0022*
  alias: pnp:cCTLXXXXdCTL0041dCTL0021*
  alias: pnp:cCTLXXXXdCTL0031dCTL0021*
  alias: pnp:cCTL00eddCTL0041dCTL0070*
  alias: pnp:cCTL00e9dCTL0045dCTL0022*
  alias: pnp:cCTL00e4dCTL0045dCTL0022*
  alias: pnp:cCTL00c7dCTL0045dCTL0022*
  alias: pnp:cCTL00c5dCTL0045dCTL0022*
  alias: pnp:cCTL00c3dCTL0045dCTL0022*
  alias: pnp:cCTL00c1dCTL0042dCTL0022*
  alias: pnp:cCTL00b2dCTL0044dCTL0023*
  alias: pnp:cCTL009edCTL0044dCTL0023*
  alias: pnp:cCTL009ddCTL0042dCTL0022*
  alias: pnp:cCTL009fdCTL0041dCTL0021*
  alias: pnp:cCTL009cdCTL0041dCTL0021*
  alias: pnp:cCTL009adCTL0041dCTL0021*
  alias: pnp:cCTL0054dCTL0031dCTL0021*
  alias: pnp:cCTL0048dCTL0031dCTL0021*
  alias: pnp:cCTL0047dCTL0031dCTL0021*
  alias: pnp:cCTL0046dCTL0031dCTL0021*
  alias: pnp:cCTL0045dCTL0031dCTL0021*
  alias: pnp:cCTL0044dCTL0031dCTL0021*
  alias: pnp:cCTL0043dCTL0031dCTL0021*
  alias: pnp:cCTL0042dCTL0031dCTL0021*
  alias: pnp:cCTL0039dCTL0031dCTL0021*
  alias: pnp:cCTL0035dCTL0031dCTL0021*

With this patch it exports only the device id's, as properly
matchable aliases:
  alias: pnp:dCTL0070*
  alias: pnp:dCTL0045*
  alias: pnp:dCTL0023*
  alias: pnp:dCTL0044*
  alias: pnp:dCTL0022*
  alias: pnp:dCTL0042*
  alias: pnp:dCTL0041*
  alias: pnp:dCTL0021*
  alias: pnp:dCTL0031*

Now, the exported value of the PNP bus can be used to autoload
a matching module:
  $ modprobe --first-time -n -v pnp:dCTL0045
  insmod /lib/modules/2.6.24-rc6-g5b825ed2-dirty/kernel/sound/core/snd-rawmidi.ko
  insmod /lib/modules/2.6.24-rc6-g5b825ed2-dirty/kernel/sound/drivers/mpu401/snd-mpu401-uart.ko
  insmod /lib/modules/2.6.24-rc6-g5b825ed2-dirty/kernel/sound/core/snd-hwdep.ko
  insmod /lib/modules/2.6.24-rc6-g5b825ed2-dirty/kernel/sound/isa/sb/snd-sb-common.ko
  insmod /lib/modules/2.6.24-rc6-g5b825ed2-dirty/kernel/sound/isa/sb/snd-sb16-csp.ko
  insmod /lib/modules/2.6.24-rc6-g5b825ed2-dirty/kernel/sound/isa/sb/snd-sb16-dsp.ko
  insmod /lib/modules/2.6.24-rc6-g5b825ed2-dirty/kernel/sound/drivers/opl3/snd-opl3-lib.ko
  insmod /lib/modules/2.6.24-rc6-g5b825ed2-dirty/kernel/sound/isa/sb/snd-sbawe.ko

  $ grep CTL0045 /sys/bus/pnp/devices/*/id
  /sys/bus/pnp/devices/01:01.00/id:CTL0045

Signed-off-by: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

parent 4b65fc8c

scripts/mod/file2alias.c

+44 −13

Original line number	Diff line number	Diff line
		@@ -328,19 +328,52 @@ static int do_pnp_entry(const char *filename,
		return 1;
		}

		/* looks like: "pnp:cCdD..." */
		static int do_pnp_card_entry(const char *filename,
		struct pnp_card_device_id id, char alias)
		/* looks like: "pnp:dD" for every device of the card */
		static void do_pnp_card_entries(void *symval, unsigned long size,
		struct module *mod)
		{
		int i;
		const unsigned long id_size = sizeof(struct pnp_card_device_id);
		const unsigned int count = (size / id_size)-1;
		const struct pnp_card_device_id *cards = symval;
		unsigned int i;

		device_id_check(mod->name, "pnp", size, id_size, symval);

		for (i = 0; i < count; i++) {
		unsigned int j;
		const struct pnp_card_device_id *card = &cards[i];

		for (j = 0; j < PNP_MAX_DEVICES; j++) {
		const char id = (char )card->devs[j].id;
		int i2, j2;
		int dup = 0;

		if (!id[0])
		break;

		/* find duplicate, already added value */
		for (i2 = 0; i2 < i && !dup; i2++) {
		const struct pnp_card_device_id *card2 = &cards[i2];

		for (j2 = 0; j2 < PNP_MAX_DEVICES; j2++) {
		const char id2 = (char )card2->devs[j2].id;

		sprintf(alias, "pnp:c%s", id->id);
		for (i = 0; i < PNP_MAX_DEVICES; i++) {
		if (! *id->devs[i].id)
		if (!id2[0])
		break;

		if (!strcmp(id, id2)) {
		dup = 1;
		break;
		sprintf(alias + strlen(alias), "d%s", id->devs[i].id);
		}
		return 1;
		}
		}

		/* add an individual alias for every device entry */
		if (!dup)
		buf_printf(&mod->dev_table_buf,
		"MODULE_ALIAS(\"pnp:d%s*\");\n", id);
		}
		}
		}

		/* Looks like: pcmcia:mNcNfNfnNpfnNvaNvbNvcNvdN. */
		@@ -634,9 +667,7 @@ void handle_moddevtable(struct module mod, struct elf_info info,
		sizeof(struct pnp_device_id), "pnp",
		do_pnp_entry, mod);
		else if (sym_is(symname, "__mod_pnp_card_device_table"))
		do_table(symval, sym->st_size,
		sizeof(struct pnp_card_device_id), "pnp_card",
		do_pnp_card_entry, mod);
		do_pnp_card_entries(symval, sym->st_size, mod);
		else if (sym_is(symname, "__mod_pcmcia_device_table"))
		do_table(symval, sym->st_size,
		sizeof(struct pcmcia_device_id), "pcmcia",

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