On Wed, Apr 11, 2018 at 1:38 PM Tomasz Figa <tfiga@xxxxxxxxxxxx> wrote:
[snip]
> > +static int dw9807_set_dac(struct i2c_client *client, u16 data)
> > +{
> > + const char tx_data[3] = {
> > + DW9807_MSB_ADDR, ((data >> 8) & 0x03), (data & 0xff)
> > + };
> > + int ret, retry = 0;
> > +
> > + /*
> > + * According to the datasheet, need to check the bus status
> before we
> > + * write VCM position. This ensure that we really write the
value
> > + * into the register
> > + */
> > + while ((ret = dw9807_i2c_check(client)) != 0) {
> > + if (ret < 0)
> > + return ret;
> > +
> > + if (MAX_RETRY == ++retry) {
> > + dev_err(&client->dev,
> > + "Cannot do the write operation because
> VCM is busy\n");
> > + return -EIO;
> > + }
> > + usleep_range(DW9807_CTRL_DELAY_US, DW9807_CTRL_DELAY_US
+
> 10);
> > + }
> One could use readx_poll_timeout() here:
> int val;
> ret = readx_poll_timeout(dw9807_i2c_check, client, val, !val,
Actually, to handle errors, it should be
ret = readx_poll_timeout(dw9807_i2c_check, client, val, val <= 0,
> DW9807_CTRL_DELAY_US,
> MAX_RETRY * DW9807_CTRL_DELAY_US);
> if (ret) {
if (ret || val < 0) {
> dev_err(&client->dev,
> "Cannot do the write operation because VCM is busy\n");
> return -EIO;
return ret ? ret : val;
Sorry for not spotting this earlier.
Best regards,
Tomasz
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