Commit 4f5c791a authored by Lennart Poettering's avatar Lennart Poettering Committed by Greg Kroah-Hartman
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DMI-based module autoloading 



The patch below adds DMI/SMBIOS based module autoloading to the Linux
kernel. The idea is to load laptop drivers automatically (and other
drivers which cannot be autoloaded otherwise), based on the DMI system
identification information of the BIOS.

Right now most distros manually try to load all available laptop
drivers on bootup in the hope that at least one of them loads
successfully. This patch does away with all that, and uses udev to
automatically load matching drivers on the right machines.

Basically the patch just exports the DMI information that has been
parsed by the kernel anyway to userspace via a sysfs device
/sys/class/dmi/id and makes sure that proper modalias attributes are
available. Besides adding the "modalias" attribute it also adds
attributes for a few other DMI fields which might be useful for
writing udev rules.

This patch is not an attempt to export the entire DMI/SMBIOS data to
userspace. We already have "dmidecode" which parses the complete DMI
info from userspace. The purpose of this patch is machine model
identification and good udev integration.

To take advantage of DMI based module autoloading, a driver should
export one or more MODULE_ALIAS fields similar to these:

MODULE_ALIAS("dmi:*:svnMICRO-STARINT'LCO.,LTD:pnMS-1013:pvr0131*:cvnMICRO-STARINT'LCO.,LTD:ct10:*");
MODULE_ALIAS("dmi:*:svnMicro-StarInternational:pnMS-1058:pvr0581:rvnMSI:rnMS-1058:*:ct10:*");
MODULE_ALIAS("dmi:*:svnMicro-StarInternational:pnMS-1412:*:rvnMSI:rnMS-1412:*:cvnMICRO-STARINT'LCO.,LTD:ct10:*");
MODULE_ALIAS("dmi:*:svnNOTEBOOK:pnSAM2000:pvr0131*:cvnMICRO-STARINT'LCO.,LTD:ct10:*");

These lines are specific to my msi-laptop.c driver. They are basically
just a concatenation of a few carefully selected DMI fields with all
potentially bad characters stripped.

Besides laptop drivers, modules like "hdaps", the i2c modules
and the hwmon modules are good candidates for "dmi:" MODULE_ALIAS
lines.

Besides merely exporting the DMI data via sysfs the patch adds
support for a few more DMI fields. Especially the CHASSIS fields are
very useful to identify different laptop modules. The patch also adds
working MODULE_ALIAS lines to my msi-laptop.c driver.

I'd like to thank Kay Sievers for helping me to clean up this patch
for posting it on lkml.

Patch is against Linus' current GIT HEAD. Should probably apply to
older kernels as well without modification.


Signed-off-by: default avatarLennart Poettering <mzxreary@0pointer.de>
Signed-off-by: default avatarKay Sievers <kay.sievers@vrfy.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent cfc94cdf

drivers/firmware/Kconfig

+9 −0
Original line number Diff line number Diff line
@@ -84,4 +84,13 @@ config DCDBAS 
	  Say Y or M here to enable the driver for use by Dell systems

	  management software such as Dell OpenManage.



config DMIID

    bool "Export DMI identification via sysfs to userspace"

    depends on DMI

    default y

	help

	  Say Y here if you want to query SMBIOS/DMI system identification

	  information from userspace through /sys/class/dmi/id/ or if you want

	  DMI-based module auto-loading.



endmenu

drivers/firmware/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -7,3 +7,4 @@ obj-$(CONFIG_EFI_VARS) += efivars.o 
obj-$(CONFIG_EFI_PCDP)		+= pcdp.o

obj-$(CONFIG_DELL_RBU)          += dell_rbu.o

obj-$(CONFIG_DCDBAS)		+= dcdbas.o

obj-$(CONFIG_DMIID)		+= dmi-id.o

drivers/firmware/dmi-id.c

0 → 100644
+222 −0
Original line number Diff line number Diff line 
/*

 * Export SMBIOS/DMI info via sysfs to userspace

 *

 * Copyright 2007, Lennart Poettering

 *

 * Licensed under GPLv2

 */



#include <linux/module.h>

#include <linux/kernel.h>

#include <linux/init.h>

#include <linux/dmi.h>

#include <linux/device.h>

#include <linux/autoconf.h>



#define DEFINE_DMI_ATTR(_name, _mode, _show)		\

static struct device_attribute sys_dmi_##_name##_attr =	\

	__ATTR(_name, _mode, _show, NULL);



#define DEFINE_DMI_ATTR_WITH_SHOW(_name, _mode, _field)			\

static ssize_t sys_dmi_##_name##_show(struct device *dev,		\

				      struct device_attribute *attr,	\

				      char *page)			\

{									\

	ssize_t len;							\

	len = scnprintf(page, PAGE_SIZE, "%s\n", dmi_get_system_info(_field)); \

	page[len-1] = '\n';						\

	return len;							\

}									\

DEFINE_DMI_ATTR(_name, _mode, sys_dmi_##_name##_show);



DEFINE_DMI_ATTR_WITH_SHOW(bios_vendor,		0444, DMI_BIOS_VENDOR);

DEFINE_DMI_ATTR_WITH_SHOW(bios_version,		0444, DMI_BIOS_VERSION);

DEFINE_DMI_ATTR_WITH_SHOW(bios_date,		0444, DMI_BIOS_DATE);

DEFINE_DMI_ATTR_WITH_SHOW(sys_vendor,		0444, DMI_SYS_VENDOR);

DEFINE_DMI_ATTR_WITH_SHOW(product_name,		0444, DMI_PRODUCT_NAME);

DEFINE_DMI_ATTR_WITH_SHOW(product_version,	0444, DMI_PRODUCT_VERSION);

DEFINE_DMI_ATTR_WITH_SHOW(product_serial,	0400, DMI_PRODUCT_SERIAL);

DEFINE_DMI_ATTR_WITH_SHOW(product_uuid,		0400, DMI_PRODUCT_UUID);

DEFINE_DMI_ATTR_WITH_SHOW(board_vendor,		0444, DMI_BOARD_VENDOR);

DEFINE_DMI_ATTR_WITH_SHOW(board_name,		0444, DMI_BOARD_NAME);

DEFINE_DMI_ATTR_WITH_SHOW(board_version,	0444, DMI_BOARD_VERSION);

DEFINE_DMI_ATTR_WITH_SHOW(board_serial,		0400, DMI_BOARD_SERIAL);

DEFINE_DMI_ATTR_WITH_SHOW(board_asset_tag,	0444, DMI_BOARD_ASSET_TAG);

DEFINE_DMI_ATTR_WITH_SHOW(chassis_vendor,	0444, DMI_CHASSIS_VENDOR);

DEFINE_DMI_ATTR_WITH_SHOW(chassis_type,		0444, DMI_CHASSIS_TYPE);

DEFINE_DMI_ATTR_WITH_SHOW(chassis_version,	0444, DMI_CHASSIS_VERSION);

DEFINE_DMI_ATTR_WITH_SHOW(chassis_serial,	0400, DMI_CHASSIS_SERIAL);

DEFINE_DMI_ATTR_WITH_SHOW(chassis_asset_tag,	0444, DMI_CHASSIS_ASSET_TAG);



static void ascii_filter(char *d, const char *s)

{

	/* Filter out characters we don't want to see in the modalias string */

	for (; *s; s++)

		if (*s > ' ' && *s < 127 && *s != ':')

			*(d++) = *s;



	*d = 0;

}



static ssize_t get_modalias(char *buffer, size_t buffer_size)

{

	static const struct mafield {

		const char *prefix;

		int field;

	} fields[] = {

		{ "bvn", DMI_BIOS_VENDOR },

		{ "bvr", DMI_BIOS_VERSION },

		{ "bd",  DMI_BIOS_DATE },

		{ "svn", DMI_SYS_VENDOR },

		{ "pn",  DMI_PRODUCT_NAME },

		{ "pvr", DMI_PRODUCT_VERSION },

		{ "rvn", DMI_BOARD_VENDOR },

		{ "rn",  DMI_BOARD_NAME },

		{ "rvr", DMI_BOARD_VERSION },

		{ "cvn", DMI_CHASSIS_VENDOR },

		{ "ct",  DMI_CHASSIS_TYPE },

		{ "cvr", DMI_CHASSIS_VERSION },

		{ NULL,  DMI_NONE }

	};



	ssize_t l, left;

	char *p;

	const struct mafield *f;



	strcpy(buffer, "dmi");

	p = buffer + 3; left = buffer_size - 4;



	for (f = fields; f->prefix && left > 0; f++) {

		const char *c;

		char *t;



		c = dmi_get_system_info(f->field);

		if (!c)

			continue;



		t = kmalloc(strlen(c) + 1, GFP_KERNEL);

		if (!t)

			break;

		ascii_filter(t, c);

		l = scnprintf(p, left, ":%s%s", f->prefix, t);

		kfree(t);



		p += l;

		left -= l;

	}



	p[0] = ':';

	p[1] = 0;



	return p - buffer + 1;

}



static ssize_t sys_dmi_modalias_show(struct device *dev,

				     struct device_attribute *attr, char *page)

{

	ssize_t r;

	r = get_modalias(page, PAGE_SIZE-1);

	page[r] = '\n';

	page[r+1] = 0;

	return r+1;

}



DEFINE_DMI_ATTR(modalias, 0444, sys_dmi_modalias_show);



static struct attribute *sys_dmi_attributes[DMI_STRING_MAX+2];



static struct attribute_group sys_dmi_attribute_group = {

	.attrs = sys_dmi_attributes,

};



static struct attribute_group* sys_dmi_attribute_groups[] = {

	&sys_dmi_attribute_group,

	NULL

};



static int dmi_dev_uevent(struct device *dev, char **envp,

			    int num_envp, char *buffer, int buffer_size)

{

	strcpy(buffer, "MODALIAS=");

	get_modalias(buffer+9, buffer_size-9);

	envp[0] = buffer;

	envp[1] = NULL;



	return 0;

}



static struct class dmi_class = {

	.name = "dmi",

	.dev_release = (void(*)(struct device *)) kfree,

	.dev_uevent = dmi_dev_uevent,

};



static struct device *dmi_dev;



/* Initialization */



#define ADD_DMI_ATTR(_name, _field) \

	if (dmi_get_system_info(_field)) \

		sys_dmi_attributes[i++] = & sys_dmi_##_name##_attr.attr;



extern int dmi_available;



static int __init dmi_id_init(void)

{

	int ret, i;



	if (!dmi_available)

		return -ENODEV;



	/* Not necessarily all DMI fields are available on all

	 * systems, hence let's built an attribute table of just

	 * what's available */

	i = 0;

	ADD_DMI_ATTR(bios_vendor,       DMI_BIOS_VENDOR);

	ADD_DMI_ATTR(bios_version,      DMI_BIOS_VERSION);

	ADD_DMI_ATTR(bios_date,         DMI_BIOS_DATE);

	ADD_DMI_ATTR(sys_vendor,        DMI_SYS_VENDOR);

	ADD_DMI_ATTR(product_name,      DMI_PRODUCT_NAME);

	ADD_DMI_ATTR(product_version,   DMI_PRODUCT_VERSION);

	ADD_DMI_ATTR(product_serial,    DMI_PRODUCT_SERIAL);

	ADD_DMI_ATTR(product_uuid,      DMI_PRODUCT_UUID);

	ADD_DMI_ATTR(board_vendor,      DMI_BOARD_VENDOR);

	ADD_DMI_ATTR(board_name,        DMI_BOARD_NAME);

	ADD_DMI_ATTR(board_version,     DMI_BOARD_VERSION);

	ADD_DMI_ATTR(board_serial,      DMI_BOARD_SERIAL);

	ADD_DMI_ATTR(board_asset_tag,   DMI_BOARD_ASSET_TAG);

	ADD_DMI_ATTR(chassis_vendor,    DMI_CHASSIS_VENDOR);

	ADD_DMI_ATTR(chassis_type,      DMI_CHASSIS_TYPE);

	ADD_DMI_ATTR(chassis_version,   DMI_CHASSIS_VERSION);

	ADD_DMI_ATTR(chassis_serial,    DMI_CHASSIS_SERIAL);

	ADD_DMI_ATTR(chassis_asset_tag, DMI_CHASSIS_ASSET_TAG);

	sys_dmi_attributes[i++] = &sys_dmi_modalias_attr.attr;



	ret = class_register(&dmi_class);

	if (ret)

		return ret;



	dmi_dev = kzalloc(sizeof(*dmi_dev), GFP_KERNEL);

	if (!dmi_dev) {

		ret = -ENOMEM;

		goto fail_class_unregister;

	}



	dmi_dev->class = &dmi_class;

	strcpy(dmi_dev->bus_id, "id");

	dmi_dev->groups = sys_dmi_attribute_groups;



	ret = device_register(dmi_dev);

	if (ret)

		goto fail_class_unregister;



	return 0;



fail_class_unregister:



	class_unregister(&dmi_class);



	return ret;

}



arch_initcall(dmi_id_init);

drivers/firmware/dmi_scan.c

+67 −6
Original line number Diff line number Diff line
@@ -84,6 +84,7 @@ static int __init dmi_checksum(u8 *buf) 


static char *dmi_ident[DMI_STRING_MAX];

static LIST_HEAD(dmi_devices);

int dmi_available;



/*

 *	Save a DMI string
@@ -102,6 +103,51 @@ static void __init dmi_save_ident(struct dmi_header *dm, int slot, int string) 
	dmi_ident[slot] = p;

}



static void __init dmi_save_uuid(struct dmi_header *dm, int slot, int index)

{

	u8 *d = (u8*) dm + index;

	char *s;

	int is_ff = 1, is_00 = 1, i;



	if (dmi_ident[slot])

		return;



	for (i = 0; i < 16 && (is_ff || is_00); i++) {

		if(d[i] != 0x00) is_ff = 0;

		if(d[i] != 0xFF) is_00 = 0;

	}



	if (is_ff || is_00)

		return;



	s = dmi_alloc(16*2+4+1);

	if (!s)

		return;



	sprintf(s,

		"%02X%02X%02X%02X-%02X%02X-%02X%02X-%02X%02X-%02X%02X%02X%02X%02X%02X",

		d[0], d[1], d[2], d[3], d[4], d[5], d[6], d[7],

		d[8], d[9], d[10], d[11], d[12], d[13], d[14], d[15]);



        dmi_ident[slot] = s;

}



static void __init dmi_save_type(struct dmi_header *dm, int slot, int index)

{

	u8 *d = (u8*) dm + index;

	char *s;



	if (dmi_ident[slot])

		return;



	s = dmi_alloc(4);

	if (!s)

		return;



	sprintf(s, "%u", *d & 0x7F);

	dmi_ident[slot] = s;

}



static void __init dmi_save_devices(struct dmi_header *dm)

{

	int i, count = (dm->length - sizeof(struct dmi_header)) / 2;
@@ -192,11 +238,21 @@ static void __init dmi_decode(struct dmi_header *dm) 
		dmi_save_ident(dm, DMI_PRODUCT_NAME, 5);

		dmi_save_ident(dm, DMI_PRODUCT_VERSION, 6);

		dmi_save_ident(dm, DMI_PRODUCT_SERIAL, 7);

		dmi_save_uuid(dm, DMI_PRODUCT_UUID, 8);

		break;

	case 2:		/* Base Board Information */

		dmi_save_ident(dm, DMI_BOARD_VENDOR, 4);

		dmi_save_ident(dm, DMI_BOARD_NAME, 5);

		dmi_save_ident(dm, DMI_BOARD_VERSION, 6);

		dmi_save_ident(dm, DMI_BOARD_SERIAL, 7);

		dmi_save_ident(dm, DMI_BOARD_ASSET_TAG, 8);

		break;

	case 3:		/* Chassis Information */

		dmi_save_ident(dm, DMI_CHASSIS_VENDOR, 4);

		dmi_save_type(dm, DMI_CHASSIS_TYPE, 5);

		dmi_save_ident(dm, DMI_CHASSIS_VERSION, 6);

		dmi_save_ident(dm, DMI_CHASSIS_SERIAL, 7);

		dmi_save_ident(dm, DMI_CHASSIS_ASSET_TAG, 8);

		break;

	case 10:	/* Onboard Devices Information */

		dmi_save_devices(dm);
@@ -253,9 +309,11 @@ void __init dmi_scan_machine(void) 


		rc = dmi_present(p + 0x10); /* offset of _DMI_ string */

		dmi_iounmap(p, 32);

		if (!rc)

		if (!rc) {

			dmi_available = 1;

			return;

		}

	}

	else {

		/*

		 * no iounmap() for that ioremap(); it would be a no-op, but
@@ -268,10 +326,12 @@ void __init dmi_scan_machine(void) 


		for (q = p; q < p + 0x10000; q += 16) {

			rc = dmi_present(q);

			if (!rc)

			if (!rc) {

				dmi_available = 1;

				return;

			}

		}

	}

 out:	printk(KERN_INFO "DMI not present or invalid.\n");

}
@@ -404,3 +464,4 @@ int dmi_get_year(int field) 


	return year;

}

drivers/misc/msi-laptop.c

+41 −3
Original line number Diff line number Diff line
@@ -23,6 +23,8 @@ 
 * msi-laptop.c - MSI S270 laptop support. This laptop is sold under

 * various brands, including "Cytron/TCM/Medion/Tchibo MD96100".

 *

 * Driver also supports S271, S420 models.

 *

 * This driver exports a few files in /sys/devices/platform/msi-laptop-pf/:

 *

 *   lcd_level - Screen brightness: contains a single integer in the
@@ -281,25 +283,56 @@ static struct platform_device *msipf_device; 


/* Initialization */



static int dmi_check_cb(struct dmi_system_id *id)

{

        printk("msi-laptop: Identified laptop model '%s'.\n", id->ident);

        return 0;

}



static struct dmi_system_id __initdata msi_dmi_table[] = {

	{

		.ident = "MSI S270",

		.matches = {

			DMI_MATCH(DMI_SYS_VENDOR, "MICRO-STAR INT'L CO.,LTD"),

			DMI_MATCH(DMI_PRODUCT_NAME, "MS-1013"),

		}

			DMI_MATCH(DMI_PRODUCT_VERSION, "0131"),

			DMI_MATCH(DMI_CHASSIS_VENDOR, "MICRO-STAR INT'L CO.,LTD")

		},

		.callback = dmi_check_cb

	},

	{

		.ident = "MSI S271",

		.matches = {

			DMI_MATCH(DMI_SYS_VENDOR, "Micro-Star International"),

			DMI_MATCH(DMI_PRODUCT_NAME, "MS-1058"),

			DMI_MATCH(DMI_PRODUCT_VERSION, "0581"),

			DMI_MATCH(DMI_BOARD_NAME, "MS-1058")

		},

		.callback = dmi_check_cb

	},

	{

		.ident = "MSI S420",

		.matches = {

			DMI_MATCH(DMI_SYS_VENDOR, "Micro-Star International"),

			DMI_MATCH(DMI_PRODUCT_NAME, "MS-1412"),

			DMI_MATCH(DMI_BOARD_VENDOR, "MSI"),

			DMI_MATCH(DMI_BOARD_NAME, "MS-1412")

		},

		.callback = dmi_check_cb

	},

	{

		.ident = "Medion MD96100",

		.matches = {

			DMI_MATCH(DMI_SYS_VENDOR, "NOTEBOOK"),

			DMI_MATCH(DMI_PRODUCT_NAME, "SAM2000"),

		}

			DMI_MATCH(DMI_PRODUCT_VERSION, "0131"),

			DMI_MATCH(DMI_CHASSIS_VENDOR, "MICRO-STAR INT'L CO.,LTD")

		},

		.callback = dmi_check_cb

	},

	{ }

};





static int __init msi_init(void)

{

	int ret;
@@ -394,3 +427,8 @@ MODULE_AUTHOR("Lennart Poettering"); 
MODULE_DESCRIPTION("MSI Laptop Support");

MODULE_VERSION(MSI_DRIVER_VERSION);

MODULE_LICENSE("GPL");



MODULE_ALIAS("dmi:*:svnMICRO-STARINT'LCO.,LTD:pnMS-1013:pvr0131*:cvnMICRO-STARINT'LCO.,LTD:ct10:*");

MODULE_ALIAS("dmi:*:svnMicro-StarInternational:pnMS-1058:pvr0581:rvnMSI:rnMS-1058:*:ct10:*");

MODULE_ALIAS("dmi:*:svnMicro-StarInternational:pnMS-1412:*:rvnMSI:rnMS-1412:*:cvnMICRO-STARINT'LCO.,LTD:ct10:*");

MODULE_ALIAS("dmi:*:svnNOTEBOOK:pnSAM2000:pvr0131*:cvnMICRO-STARINT'LCO.,LTD:ct10:*");

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