From: Frans Pop <elendil@planet.nl>
To: linux-kernel@vger.kernel.org
Subject: char/tpm: tpm_infineon no longer loaded for HP 2510p laptop
Date: Mon, 18 Aug 2008 15:40:24 +0200
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Cc: Marcel Selhorst <tpm@selhorst.net>
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While comparing the loaded modules for 2.6.26 and 2.6.27-rc3 for my HP 
2510p, I noticed that the tpm_infineon module and related modules no 
longer get loaded automatically.

The difference seems to be that 2.6.26 listed:
/lib/modules/2.6.26.2/modules.alias:alias pnp:dIFX0102* tpm_infineon
/lib/modules/2.6.26.2/modules.alias:alias pnp:dIFX0101* tpm_infineon

while 2.6.27 has:
/lib/modules/2.6.27-rc3/modules.alias:alias acpi*:IFX0101:* tpm_infineon
/lib/modules/2.6.27-rc3/modules.alias:alias pnp:dIFX0101* tpm_infineon

My system has:
$ grep IFX /sys/bus/pnp/devices/*/id
/sys/bus/pnp/devices/00:02/id:IFX0102

And if I modprobe the module manually the device really does seem to be 
supported:
pnp: the driver 'tpm_inf_pnp' has been registered
tpm_inf_pnp 00:02: Found C284 with ID IFX0102
tpm_inf_pnp 00:02: TPM found: config base 0x560, data base 0x570, chip 
version 0x000b, vendor id 0x15d1 (Infineon), product id 0x000b (SLB 9635 
TT 1.2)
tpm_inf_pnp 00:02: driver attached

Relevant bit of the kernel config:
CONFIG_TCG_TPM=m
CONFIG_TCG_TIS=m
# CONFIG_TCG_NSC is not set
# CONFIG_TCG_ATMEL is not set
CONFIG_TCG_INFINEON=m

I've taken a quick look at changes from 2.6.26 in drivers/char/tpm/ but 
did not see really anything there that could explain this difference in 
behavior.

Cheers,
FJP
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