[MinnowBoard] drivers/platform/x86/minnowboard.c for MinnowboardMax?

Sun Feb 15 14:13:25 UTC 2015

After compared with an ARM platform, I found the Minnowboard MAX platform
does not support the i2c_register_board_info function call, I have to use
the i2c_new_device function(Since the X86 does not use static I2c adapter
register process)

I found there is a drivers/platform/chrome/chromeos_laptop.c, there are
several examples for adding I2C devices in X86 platform. Can we re-use this
file for the Minnow MAX board ?

2015-02-10 22:23 GMT+08:00 Yong Li <sdliyong at gmail.com>:

> Thanks Henry. I can access the bmp085 driver sysfs entries using the below
> command:
>
> echo bmp085 0x77 > /sys/devices/platform/80860F41:05/i2c-7/new_device
>
>
>
> I am using the LSE I2C pins. Documentation shows i2c on bus #5, ACPI
> shows it on bus #6, but driver uses bus #7
>
>
>
> I want to load the bmp085 automatically during kernel boot, so I add the
> below code and change the i2c_designware_platform.ko(It is /dev/i2c-7) to
> statically linked with kernel.
>
>                 adapter = i2c_get_adapter(7);
>
>                 if (adapter) {
>
>                                 printk("**%s get adapter!\n",
> __FUNCTION__);
>
>                                 client = i2c_new_device(adapter,
> &i2c_info);
>
>                                 if (!client)
>
>                                                 pr_err("can't create i2c
> device %s\n");
>
>                 } else {
>
>                                 printk("**%s get_adapter fail!
> register_board_info\n", __FUNCTION__);
>
>                                 i2c_register_board_info(7, &i2c_info, 1);
>
>                 }
>
>
>
> After change the i2c_designware_platform to statically linked, the
> i2c_new_device is called, the sensor probe can be triggered but failed. I
> cannot detect the I2C device using I2cdetect command too! I tested all
> these i2c-0 to i2c-9 devices.
>
>
>
> I have to change it back to .ko, in this mode, the i2c_register_board_info
> is called, but it cannot trigger the bmp085 probe function.
>
>
>
> Any suggestions/comments?
>
>
>
> Thanks,
>
> Yong Li
>
> 2015-02-09 23:56 GMT+08:00 Darren Hart <dvhart at linux.intel.com>:
>
>> The generic driver structure works the same for x86. Ideally you would be
>> able to trigger the probe via an SSDT overlay (small bit of AML that
>> functions similar to a fdt blob). The driver itself would only need a
>> couple updates to support the new device-properties API which abstracts
>> away the ACPI and DT part from properties collection. But, that doesn't
>> help you too much right now.
>>
>> One approach would be to dynamically create the device at runtime, with
>> something like:
>>
>> # echo bmp085 0x77 > /sys/class/i2c-adapter/i2c-0/new_device
>>
>> (I'm not in front of a Mmax at the moment, so verify the paths and values)
>>
>> Check that it worked with:
>> # dmesg | grep bmp
>>
>> You should see something like:
>> i2c i2c-1: new_device: Instantiated device bmp085 at 0x77
>> bmp085 1-0077: Successfully initialized bmp085!
>>
>>
>> Alternatively, you could write a simple board file driver which populates
>> the bmp085 platform data and registers the device. I didn't find any
>> bmp085 specific examples, but you should be able to follow another i2c
>> example board file and extrapolate from there.
>>
>> Thanks,
>>
>> --
>> Darren Hart
>> Intel Open Source Technology Center
>>
>>
>>
>>
>> From:  Yong Li <sdliyong at gmail.com>
>> Reply-To:  MinnowBoard Development and Community Discussion
>> <elinux-minnowboard at lists.elinux.org>
>> Date:  Monday, February 9, 2015 at 6:10 AM
>> To:  <henry.bruce at intel.com>
>> Cc:  <elinux-minnowboard at lists.elinux.org>
>> Subject:  [MinnowBoard] drivers/platform/x86/minnowboard.c for
>> MinnowboardMax?
>>
>>
>> >Hi Henry,
>> >
>> >Thanks for your reply. I am testing a pressure sensor using the MAX
>> >board. It is an IIC device, and the kernel does support it with
>> >drivers/misc/bmp085.c. I really want to use the kernel device driver to
>> >support this device(Using /sys file to query the pressure)
>> >
>> >The problem is I do not know how to trigger the driver_probe function.
>> >
>> >On ARM platform, there are board/machine .c files, I can add i2c board
>> >info in these files. However I do not know to use the
>> >i2c_register_board_info on X86, is there any examples?.
>> >
>> >Message: 4
>> >Date: Mon, 9 Feb 2015 07:42:06 +0000
>> >From: "Bruce, Henry" <henry.bruce at intel.com>
>> >To: MinnowBoard Development and Community Discussion
>> >        <elinux-minnowboard at lists.elinux.org>
>> >Subject: Re: [MinnowBoard] drivers/platform/x86/minnowboard.c for
>> >        Minnowboard     Max?
>> >Message-ID:
>> >
>> ><F81DC1078564A34BB4DA30CAE03814D127685017 at ORSMSX104.amr.corp.intel.com>
>> >
>> >Content-Type: text/plain; charset="utf-8"
>> >
>> >Yong Li,
>> >
>> >Take a look at the mraa<https://github.com/intel-iot-devkit/mraa>
>> library
>> >that supports gpio and i2c for Minnowboard Max. For software that uses
>> >this library see the upm sensor
>> >library.<https://github.com/intel-iot-devkit/upm> There is no support
>> >planned for Minnowboard v1.
>> >
>> >Regards,
>> >
>> >Henry Bruce
>> >
>> >
>> >
>> >From: elinux-MinnowBoard
>> >[mailto:elinux-minnowboard-bounces at lists.elinux.org] On Behalf Of Yong
>> Li
>> >Sent: Sunday, February 8, 2015 4:57 AM
>> >To: elinux-minnowboard at lists.elinux.org
>> >Subject: [MinnowBoard] drivers/platform/x86/minnowboard.c for Minnowboard
>> >Max?
>> >
>> >Hi All, I am using the kernel 3.14.19 for my Max, but I did not find the
>> >drivers/platform/x86/minnowboard.c file and other related patches for
>> >Minnowboard, I would like to port them to support the Max board, to add
>> >some other IO devices, such as IIC, SPI and other GPIO devices.
>> >
>> >In which version, can I find these files? Is there any other demo drivers
>> >for the IIC/SPI on Minnboard and/or Max board?
>> >
>> >Thanks,
>> >Yong Li
>> >
>> >_______________________________________________
>> >elinux-MinnowBoard mailing list
>> >elinux-MinnowBoard at lists.elinux.orghttp://
>> lists.elinux.org/mailman/listinf
>> >o/elinux-minnowboard
>>
>>
>>
>
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