linux-kernel - Re: [i2c] [PATCH] update module-init-tools to support the i2c subsystem

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Date:	Mon, 14 Jan 2008 18:08:16 +0100 (CET)
From:	Geert Uytterhoeven <Geert.Uytterhoeven@...ycom.com>
To:	Jean Delvare <khali@...ux-fr.org>
cc:	linuxppc-dev@...abs.org, linux-kernel@...r.kernel.org,
	i2c@...sensors.org
Subject: Re: [i2c] [PATCH] update module-init-tools to support the i2c 
 subsystem

On Mon, 14 Jan 2008, Jean Delvare wrote:
> On Mon, 14 Jan 2008 11:57:52 +0100 (CET), Geert Uytterhoeven wrote:
> > On Sun, 13 Jan 2008, Jon Smirl wrote:
> > > I don't know exactly what those modules tables are used for. I just
> > > copied what the other subsystems do. Maybe they are used when you make
> > > an initrd to know which drivers to copy into the image.
> > 
> > Module-init-tools needs those table to create module aliases in the *.ko
> > files from the MODULE_DEVICE_TABLE(), so udev can load the modules based
> > on the device IDs when the devices appear in sysfs.
> 
> I thought that the module aliases were generated by
> scripts/mod/modpost? As a matter of fact, I did not apply Jon's patch

Sorry, you're right. Too early in the morning :-)

> to module-init-tools, and "modinfo" shows me module aliases properly
> for i2c drivers that call MODULE_DEVICE_TABLE():

I've just looked it up again (I had to do a similar thing for Zorro bus
support).  Module-init-tools (depmod) also creates the modules.*map files,
which are used to map from device IDs to module names. I think these are used
by udev to load the appropriate module when a device with a specific device ID
pops up in sysfs.

> $ /sbin/modinfo lm90
> filename:       /lib/modules/2.6.24-rc7-git4/kernel/drivers/hwmon/lm90.ko
> author:         Jean Delvare <khali@...ux-fr.org>
> description:    LM90/ADM1032 driver
> license:        GPL
> vermagic:       2.6.24-rc7-git4 mod_unload
> depends:        hwmon
> alias:          i2c:Nlm90*
> alias:          i2c:Nadm1032*
> alias:          i2c:Nlm99*
> alias:          i2c:Nlm86*
> alias:          i2c:Nmax6657*
> alias:          i2c:Nadt7461*
> alias:          i2c:Nmax6680*
> $
> 
> "modprobe i2c:Nadm1032" loads the lm90 driver as expected.

Yes, it's also still not 100% clear to me when `i2c:Nadm1032' is used, and when
modules.i2cmap would be used...

With kind regards,

Geert Uytterhoeven
Software Architect

Sony Network and Software Technology Center Europe
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E-mail:   Geert.Uytterhoeven@...ycom.com
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