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[SOLVED]How to pass parameters to an auto-loaded module?
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DooBeDooBeDo
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PostPosted: Tue Feb 04, 2014 8:29 pm    Post subject: [SOLVED]How to pass parameters to an auto-loaded module? Reply with quote

I've just got a new DVB card (Tevii S464). At boot it auto-loads a bunch of modules:
Quote:
$ modprobe --show-depends cx8802
insmod /lib/modules/3.10.17-gentoo/kernel/drivers/media/v4l2-core/videobuf-core.ko
insmod /lib/modules/3.10.17-gentoo/kernel/drivers/media/v4l2-core/videobuf-dma-sg.ko
insmod /lib/modules/3.10.17-gentoo/kernel/drivers/media/common/btcx-risc.ko
insmod /lib/modules/3.10.17-gentoo/kernel/drivers/media/common/tveeprom.ko
insmod /lib/modules/3.10.17-gentoo/kernel/drivers/media/pci/cx88/cx88xx.ko <-- I need to pass an argument to this one
insmod /lib/modules/3.10.17-gentoo/kernel/drivers/media/pci/cx88/cx8802.ko


Can anyone tell me how to do this in the sanest way?


Last edited by DooBeDooBeDo on Wed Feb 05, 2014 4:34 pm; edited 1 time in total
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albright
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PostPosted: Tue Feb 04, 2014 8:54 pm    Post subject: Reply with quote

adding the module (or a set of them) to /etc/modprobe.d/blacklist.conf

and then loading it (or them) via /etc/conf.d/modules might work


for example (taken from my own files)

Code:
/etc/modprobe.d $ cat blacklist.conf
#blacklist e1000e
blacklist thinkpad_acpi


and

Code:
/etc/conf.d $ cat modules
modules="thinkpad_acpi snd_hda_intel snd_hda_codec_realtek"
module_thinkpad_acpi_args="fan_control=1"
module_snd_hda_intel_args="index=2"

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DooBeDooBeDo
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PostPosted: Tue Feb 04, 2014 11:11 pm    Post subject: Reply with quote

Despite the modules being blacklisted they were loaded anyway. I've created a /etc/local.d/tevii_s464.start

Code:
/sbin/modprobe -r cx8800 cx8802 cx88xx btcx_risc videobuf_dma_sg videobuf_core tveeprom

/sbin/modprobe cx88xx card=86
/sbin/modprobe cx8800
/sbin/modprobe cx8802


Not ideal but it works :/. I'd like to know how to do this properly though. It's been quite a while since I had to mess around like this...
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BitJam
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PostPosted: Wed Feb 05, 2014 9:19 am    Post subject: Reply with quote

This is explained in "man modprobe.d":
Code:
       Because the modprobe command can add or remove more than one module, due to
       modules having dependencies, we need a method of specifying what options are to
       be used with those modules. All files underneath the /etc/modprobe.d directory
       which end with the .conf extension specify those options as required. [...]

options modulename option...
      This command allows you to add options to the module modulename (which might
      be an alias) every time it is inserted into the kernel: whether directly
      (using modprobemodulename or because the module being inserted depends on
      this module.

This man page also explains how to blacklist modules.
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xaviermiller
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PostPosted: Wed Feb 05, 2014 9:33 am    Post subject: Reply with quote

You can pass module parameters in /etc/modprobe.d

take a look at alsa.conf for example ;)
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DooBeDooBeDo
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PostPosted: Wed Feb 05, 2014 3:08 pm    Post subject: Reply with quote

Cool, that's much better :). I didn't like my nasty hack even though it worked.
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