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| 01:12.23 | George | kergoth: how're you these days btw? haven't spoken to you in ... well. a fuck of a long time |
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| 09:57.18 | drasko | Hi all... I need help with I2C drivers. Anyone had any experience? How to implement these? I am using ARM926EJ with AMBA bus. |
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| 10:05.19 | drasko | Hi all... I need help with I2C drivers. How to implement these? Is AMBA bus supported? I am using ARM926EJ with uCLinux and RTAI. |
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| 10:27.14 | drasko | anyone on the channel? |
| 11:13.32 | [g2] | drasko are you looking to bit bang the i2c ? |
| 11:25.38 | drasko | g2 |
| 11:25.54 | drasko | g2, is that algo for i2c? |
| 11:25.55 | [g2] | drasko yes ? |
| 11:26.13 | drasko | well, I can see that implemented... |
| 11:26.33 | drasko | but, I wonder about files in 'busses' directory |
| 11:26.50 | drasko | I do not know which one to use for AMBA |
| 11:27.50 | drasko | g2, did you have any experiances with i2c driver? |
| 11:28.11 | [g2] | drasko I don't know about the 926EJ or RTIA, however the IXP4xx I've been using for the last two years does it via bit banging in SW |
| 11:28.46 | [g2] | there are 3 i2c devices on my board, eeprom, rtc, and voltage/temp sensors |
| 11:30.06 | [g2] | many versions of the 2.6 kernel have this in it |
| 11:30.13 | drasko | so, I wonder which part of driver are bus architecture specific. And which to use for AMBA. Any ideas? |
| 11:30.57 | [g2] | well is the i2c in hw or are you trying to bit bang it on the GPIOs ? |
| 11:32.28 | drasko | i2c is in harware |
| 11:33.20 | [g2] | ok then you'd need (or have to write) a driver for that platform/family |
| 11:34.07 | [g2] | it's quite possible that a trivial port might work depending on the hw |
| 11:34.25 | drasko | well, bubt I do not where to start :) |
| 11:34.39 | drasko | These things are very much unclear to me... |
| 11:35.03 | [g2] | well the latest 2.6 kernel to see if the driver is already there for a ARM926EJ machine would be a good start :) |
| 11:35.55 | drasko | Can you throw some light? I mean -- I can see algos, busses and chips directories for i2c driver |
| 11:36.29 | drasko | g2, what do you mean, which driver? i2c? |
| 11:50.42 | [g2] | drasko you need to start finding your way around the kernel tree |
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| 11:51.08 | [g2] | some of the TI omap processors are 926 based |
| 11:51.49 | [g2] | there's an i2c references in linux-2.6.17/arch/arm/plat-omap/devices.c |
| 11:52.10 | [g2] | there may be others under the arm tree also |
| 11:52.26 | [g2] | you need to find if there is something for your arch |
| 11:52.35 | drasko | g2, my processor is supported bu linux, and I have 2.6 installed on this custom design |
| 11:53.17 | [g2] | drasko is i2c supported by your kernel ? |
| 11:54.27 | [g2] | if so, then just interface with the driver |
| 11:54.28 | drasko | g2, well I guess not. I do not know how to check this. I am just looking at the sources and I suppose that this driver, which is LM driver -- wont work |
| 11:54.36 | [g2] | if not, then you need to write a driver for it |
| 11:55.13 | drasko | g2, right, I wont to write a driver. |
| 11:55.13 | [g2] | well you've got to configure the kernel for the right chips |
| 11:55.39 | drasko | g2, yes |
| 11:55.57 | [g2] | have you probed the i2c bus ? |
| 11:56.47 | drasko | g2, what do you mean? |
| 11:56.52 | drasko | inserted module? |
| 11:58.33 | [g2] | well that probably gives some info too, but I was thinking the lm-sensor tools |
| 11:58.39 | [g2] | like i2cdetect |
| 11:58.58 | [g2] | and i2cdump |
| 11:59.40 | [g2] | drasko is one of your chips supported in the kernel ? |
| 12:00.04 | drasko | g2, chips, like peripherals? |
| 12:00.10 | [g2] | yes |
| 12:00.11 | drasko | g2, or uP |
| 12:01.03 | drasko | aha... Right now I did not attach any peripherals... |
| 12:01.39 | drasko | i am just looking around trying to figure out how this driver works... |
| 12:02.18 | drasko | What are the files for'busses', 'algos' and so on... Chips are for peripherals, so I guess thase are supported... |
| 12:02.26 | drasko | But one question: |
| 12:03.43 | drasko | i2c drivers from LM come with 'chips' folder. So -- only these chips are supported, right? If I want some other peripheral on my i2c, i have to write chips poriton of the driver? right? |
| 12:04.49 | [g2] | drasko I'm guessing your stuff is RTIA centric, I've never used that and I think it's not free as in it costs $$$ |
| 12:05.11 | drasko | it's totly free |
| 12:05.35 | drasko | https://www.rtai.org/ |
| 12:05.45 | [g2] | ok that's good to know |
| 12:06.01 | drasko | but the questions I am asking are related to kernel and i2c... |
| 12:06.18 | drasko | huh... |
| 12:08.13 | [g2] | drasko my little understanding from using i2c on the XScale hw is the following: |
| 12:08.29 | [g2] | 1) there needs to be a base driver for the i2c mechanism |
| 12:08.50 | [g2] | 2) there needs to be support for the peripheral chips |
| 12:09.07 | [g2] | 3) you need some userland software to access the information |
| 12:11.03 | [g2] | In my case I've used the lm-sensors stuff from debian or looked in /sys/bus/i2c |
| 12:12.46 | [g2] | I'm sorry that I don't know enough to really help you |
| 12:15.42 | drasko | g2, you really helped already! |
| 12:15.51 | drasko | thanks :) |
| 12:16.04 | [g2] | with 1) and 2) you simply modprobe your device or if it's built into the kernel things show up in /sys/bus/i2c/drivers |
| 12:16.34 | [g2] | ok if you say so :) |
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| 23:39.37 | file | nothing but nothing? |
| 23:44.42 | chouimat|food | file: hey! |
| 23:45.49 | file | hola |