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

Tue Feb 10 14:23:33 UTC 2015

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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