On Tue, Oct 04, 2022 at 08:11:37PM +0200, Enrik Berkhan wrote:
> Hi Michael,
>
> On Wed, 2022-09-28 at 17:48 +0300, Michael Zaidman wrote:
> > diff --git a/drivers/hid/hid-ft260.c b/drivers/hid/hid-ft260.c
> > index bfda5b191a3a..cb8f1782d1f0 100644
> > --- a/drivers/hid/hid-ft260.c
> > +++ b/drivers/hid/hid-ft260.c
> > @@ -460,49 +460,68 @@ static int ft260_smbus_write(struct ft260_device *dev, u8 addr, u8 cmd,
> > static int ft260_i2c_read(struct ft260_device *dev, u8 addr, u8 *data,
> > u16 len, u8 flag)
> > {
> > + u16 rd_len;
> > + int timeout, ret;
> > struct ft260_i2c_read_request_report rep;
> > struct hid_device *hdev = dev->hdev;
> > - int timeout;
> > - int ret;
> > + bool first = true;
> >
> > - if (len > FT260_RD_DATA_MAX) {
> > - hid_err(hdev, "%s: unsupported rd len: %d\n", __func__, len);
> > - return -EINVAL;
> > - }
> > + do {
> > + if (first) {
> > + if (flag & FT260_FLAG_START_REPEATED)
>
> I think the test should be
>
> if ((flag & FT260_FLAG_START_REPEATED) == FT260_FLAG_START_REPEATED)
>
> Otherwise, flag will never be FT260_FLAG_START ( = 2), as
> FT260_FLAG_START_REPEATED (= 3) has tow bits set. It looks as if bit 0
> actually means "repeated", bit 1 is "start" and bit 2 is "stop".
>
> Cheers,
> Enrik
>
Thanks for reviewing the code!
Though the FT260 works fine with the FT260_FLAG_START_REPEATED flag at the
beginning of the I2C IO, I will fix it as you suggested.
Thanks,
Michael
