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Zazzman
n00b
Joined: 09 May 2012
Posts: 32
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 Posted: Fri Nov 10, 2017 9:09 pm Post subject: missing doc on the Gentoo Wiki: found |
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https://wiki.gentoo.org/wiki/Hardware_detection
see the ??????? for i2c-tools package? the command we're missing is 'i2cdetect'. within that context, the user would probably only need the command. It outputs a neat little list of i2c buses, each with a description that should look deeply related to the kernel drivers necessary.
Correct me if I'm wrong, but card0-DP-1 and so on refers to the first DisplayPort (DP) on the first graphics card. and there's plenty more graphics related bit-bus entries to expect.
Note that other uses of the i2cdetect can destroy your hardware, according to the manpage.
So far, it looks like a nice way to probe for the SMBus/etc driver(s) to compile into your kernel, without having to dive deep into lshw, or pull up a desktop for lshw-gtk. |
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josephg
l33t
Joined: 10 Jan 2016
Posts: 783
Location: usually offline
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| Posted: Tue Jan 09, 2018 7:13 pm Post subject: Re: missing doc on the Gentoo Wiki: found |
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outputs nothing..  what does that mean? |
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kite14
Apprentice
Joined: 07 Nov 2006
Posts: 216
Location: Italy
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| Posted: Tue Jan 09, 2018 8:21 pm Post subject: |
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| josephg wrote: |
outputs nothing.. what does that mean? |
I guess the proper kernel driver is not loaded.
According to the README file that comes with the source tarball, these tools need the "i2c-dev" kernel driver
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https://www.kernel.org/doc/Documentation/i2c/dev-interface
«Usually, i2c devices are controlled by a kernel driver. But it is also
possible to access all devices on an adapter from userspace, through
the /dev interface. You need to load module i2c-dev for this.
Each registered i2c adapter gets a number, counting from 0. You can
examine /sys/class/i2c-dev/ to see what number corresponds to which adapter.
Alternatively, you can run "i2cdetect -l" to obtain a formatted list of all
i2c adapters present on your system at a given time. i2cdetect is part of
the i2c-tools package.» |
To build i2c-dev driver, enable CONFIG_I2C_CHARDEV in kernel config (either "Y" or "M") |
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kite14
Apprentice
Joined: 07 Nov 2006
Posts: 216
Location: Italy
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| Posted: Tue Jan 09, 2018 8:43 pm Post subject: |
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Zazzman,
I edited the wiki page, replacing the "???????" with the appropriate command. |
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josephg
l33t
Joined: 10 Jan 2016
Posts: 783
Location: usually offline
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| Posted: Tue Jan 09, 2018 8:49 pm Post subject: |
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| kite14 wrote: | I guess the proper kernel driver is not loaded.
According to the README file that comes with the source tarball, these tools need the "i2c-dev" kernel driver |
yes thank you. i2c-dev was not loaded. so i modprobe'd it along with all other i2c modules i found. now i have
| Code: | $ lsmod | grep i2c
intel_quark_i2c_gpio 12288 0
i2c_slave_eeprom 12288 0
i2c_scmi 12288 0
i2c_ocores 12288 0
i2c_mux_reg 12288 0
i2c_mux_pinctrl 12288 0
i2c_mux_gpio 12288 0
i2c_mux 12288 3 i2c_mux_reg,i2c_mux_pinctrl,i2c_mux_gpio
i2c_ismt 12288 0
i2c_isch 12288 0
i2c_gpio 12288 0
i2c_dev 12288 0
i2c_algo_bit 12288 2 i2c_gpio,i915
i2c_i801 24576 0
i2c_smbus 12288 1 i2c_i801
mfd_core 12288 2 lpc_ich,intel_quark_i2c_gpio |
| Code: | # i2cdetect -l
i2c-3 i2c i915 gmbus panel I2C adapter
i2c-1 i2c i915 gmbus ssc I2C adapter
i2c-6 i2c i915 gmbus dpd I2C adapter
i2c-4 i2c i915 gmbus dpc I2C adapter
i2c-2 i2c i915 gmbus vga I2C adapter
i2c-0 smbus SMBus I801 adapter at 5000 SMBus adapter
i2c-7 i2c DPDDC-D I2C adapter
i2c-5 i2c i915 gmbus dpb I2C adapter |
if i sort it, it looks even better
| Code: | # i2cdetect -l | sort
i2c-0 smbus SMBus I801 adapter at 5000 SMBus adapter
i2c-1 i2c i915 gmbus ssc I2C adapter
i2c-2 i2c i915 gmbus vga I2C adapter
i2c-3 i2c i915 gmbus panel I2C adapter
i2c-4 i2c i915 gmbus dpc I2C adapter
i2c-5 i2c i915 gmbus dpb I2C adapter
i2c-6 i2c i915 gmbus dpd I2C adapter
i2c-7 i2c DPDDC-D I2C adapter |
| Zazzman wrote: | | It outputs a neat little list of i2c buses, each with a description that should look deeply related to the kernel drivers necessary. |
how would i relate this to my kernel config? i can only find an i2c_smbus in my kernel config. |
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