On 02/22/2011 07:48 PM, Jonathan Cameron wrote:
> On 02/15/11 14:46, michael.hennerich@xxxxxxxxxx wrote:
>
>> From: Michael Hennerich <michael.hennerich@xxxxxxxxxx>
>>
>> In case a timestamp is present, scan size returned by size_from_channelarray()
>> is not longer valid.
>>
> Really? Shouldn't the timestamp just be picked up as another channel assuming
> all the relevant attributes are present (which they should be...)
>
I think the pronunciation is on 'should be'.
Looks like all my drivers don't do it, as well as some of yours.
My assumption was that bytes_per_datum must be properly set.
And that the timestamp is always assumed to be the last 8bytes aligned
on a 64-bit boundary.
I guess some drivers need fixing.
>
>> However size_from_channelarray() must be still called
>> in order to setup locations within the buffer.
>>
>> Signed-off-by: Michael Hennerich <michael.hennerich@xxxxxxxxxx>
>> ---
>> drivers/staging/iio/Documentation/generic_buffer.c | 8 +++++++-
>> 1 files changed, 7 insertions(+), 1 deletions(-)
>>
>> diff --git a/drivers/staging/iio/Documentation/generic_buffer.c b/drivers/staging/iio/Documentation/generic_buffer.c
>> index 131d9d0..c382452 100644
>> --- a/drivers/staging/iio/Documentation/generic_buffer.c
>> +++ b/drivers/staging/iio/Documentation/generic_buffer.c
>> @@ -226,7 +226,13 @@ int main(int argc, char **argv)
>> ret = write_sysfs_int("enable", buf_dir_name, 1);
>> if (ret < 0)
>> goto error_free_buf_dir_name;
>> - scan_size = size_from_channelarray(infoarray, num_channels);
>> +
>> + scan_size = read_sysfs_posint("bytes_per_datum", buf_dir_name);
>> + if (ret < 0)
>> + goto error_free_buf_dir_name;
>> +
>> + size_from_channelarray(infoarray, num_channels);
>> +
>> data = malloc(scan_size*buf_len);
>> if (!data) {
>> ret = -ENOMEM;
>>
>
--
Greetings,
Michael
--
Analog Devices GmbH Wilhelm-Wagenfeld-Str. 6 80807 Muenchen
Sitz der Gesellschaft: Muenchen; Registergericht: Muenchen HRB 40368;
Geschaeftsfuehrer:Dr.Carsten Suckrow, Thomas Wessel, William A. Martin,
Margaret Seif
--
To unsubscribe from this list: send the line "unsubscribe linux-iio" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
