On 09/04/2015 12:06 PM, Hans Verkuil wrote:
> Hi Antti,
>
> Two comments, see below:
>
> On 09/01/2015 11:59 PM, Antti Palosaari wrote:
>> HackRF SDR device has both receiver and transmitter. There is limitation
>> that receiver and transmitter cannot be used at the same time
>> (half-duplex operation). That patch implements transmitter support to
>> existing receiver only driver.
>>
>> Signed-off-by: Antti Palosaari <cr...@iki.fi>
>> ---
>> drivers/media/usb/hackrf/hackrf.c | 923
>> ++++++++++++++++++++++++++------------
>> 1 file changed, 648 insertions(+), 275 deletions(-)
>>
>> diff --git a/drivers/media/usb/hackrf/hackrf.c
>> b/drivers/media/usb/hackrf/hackrf.c
>> -static unsigned int hackrf_convert_stream(struct hackrf_dev *dev,
>> - void *dst, void *src, unsigned int src_len)
>> +void hackrf_copy_stream(struct hackrf_dev *dev, void *dst,
>
> Is there any reason 'static' was removed here? It's not used externally as
> far as I can tell.
>
>> + void *src, unsigned int src_len)
>> {
>> memcpy(dst, src, src_len);
>>
>
> <snip>
>
>> +static int hackrf_s_modulator(struct file *file, void *fh,
>> + const struct v4l2_modulator *a)
>> +{
>> + struct hackrf_dev *dev = video_drvdata(file);
>> + int ret;
>> +
>> + dev_dbg(dev->dev, "index=%d\n", a->index);
>> +
>> + if (a->index == 0)
>> + ret = 0;
>> + else if (a->index == 1)
>> + ret = 0;
>> + else
>> + ret = -EINVAL;
>> +
>> + return ret;
>> +}
>
> Why implement this at all? It's not doing anything. I'd just drop s_modulator
> support.
>
> If there is a reason why you do need it, then simplify it to:
>
> return a->index > 1 ? -EINVAL : 0;
Oops, I was wrong. You need this regardless for the simple reason that the spec
mandates it. And indeed without s_modulator v4l2-compliance will fail.
I've put back this function, but replacing the index check with the one-liner I
suggested above.
I'm merging this hackrf patch series with that change and a small fix for the
krobot 'unused intf' warning, so you don't need to do anything.
Thanks for doing this work!
Regards,
Hans
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