Re: [PATCH v5 0/4] iio: Add support for rotation from north
From: Reyad Attiyat
Date: Tue Jul 15 2014 - 23:38:54 EST
Thanks for looking into this for me!
I'll fix it up and resubmit soon.
On Tue, Jul 15, 2014 at 4:39 PM, Srinivas Pandruvada
> Since you have only one attribute, it is working for you.
> There is a dereference error in *channels.
> Check the attached diff, which will fix this.
> On 07/09/2014 03:12 PM, Reyad Attiyat wrote:
>> Hey Srinivas,
>> I did look into the panic you sent. I wasn't sure exactly what caused
>> the NULL pointer.
>> I tested it with out applying the last rotation from north patch, so
>> no hid usages are found, my device only has rotation_from_north, and
>> hid_parse_report() would return -EINVAL.
>> I added another check to make sure a iio channel were set up, and
>> return -EINVAL if not, but couldn't think of anything else.
>> Could you test this version with dynamic debugging and see if it is
>> finding any hid usage attributes.
>> Any ideas what could cause this? I think I'm handling errors properly
>> by returning what parse_report returns (-EINVAL or -ENOMEM) in probe
>> Reyad Attiyat
>> On Wed, Jul 9, 2014 at 2:45 PM, Srinivas Pandruvada
>> <srinivas.pandruvada@xxxxxxxxxxxxxxx> wrote:
>>> On 07/09/2014 12:30 PM, Reyad Attiyat wrote:
>>>> This series of patches modifies magn-3d driver to handle the rotation
>>>> from north usage. This is done by scanning the report and then building
>>>> the iio arrays (vals and channels) dynamically.
>>>> Changes from V4
>>>> I use the address field of struct iio_chan_spec to hold the array index
>>>> of the usage attribute. The scan_index field is generated when creating
>>>> an iio channel.
>>>> Reyad Attiyat (4):
>>>> iio: Documentation: Add documentation for rotation from north sensor
>>>> usage attributes
>>>> iio: types: Added support for rotation from north usage attributes
>>>> iio: hid-sensor-magn-3d: Scan for usage attributes before setting up
>>>> iio channels
>>>> iio: hid-sensor-magn-3d: Add support for rotation from north
>>>> Documentation/ABI/testing/sysfs-bus-iio | 82 +++++++++++
>>>> drivers/iio/industrialio-core.c | 4 +
>>>> drivers/iio/magnetometer/hid-sensor-magn-3d.c | 199
>>>> include/linux/iio/types.h | 4 +
>>>> 4 files changed, 245 insertions(+), 44 deletions(-)
>>> Did you get chance to look at the cause of panic?
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