Hi Dmitry,
thanks for your review!
[...]
> > +static void s6sy761_report_coordinates(struct s6sy761_data *sdata, u8 *event)
> > +{
> > + u8 tid = ((event[0] & S6SY761_MASK_TID) >> 2) - 1;
>
> Should we make sure that event[0] & S6SY761_MASK_TID is not 0?
I check event[0] already in s6sy761_handle_events (called by the
irq handler), if we get here event[0] is for sure positive...
[...]
> > +static void s6sy761_handle_events(struct s6sy761_data *sdata, u8 left_event)
> > +{
> > + int i;
> > +
> > + for (i = 0; i < left_event; i++) {
> > + u8 *event = &sdata->data[i * S6SY761_EVENT_SIZE];
> > + u8 event_id = event[0] & S6SY761_MASK_EID;
> > +
> > + if (!event[0])
> > + return;
^^^^^^^^
... exactly here.
'!event[0]' means also to me that there is nothing left,
therefore I can discard whatever is next (given that there is
something left).
> > + switch (event_id) {
> > +
> > + case S6SY761_EVENT_ID_COORDINATE:
> > + s6sy761_handle_coordinates(sdata, event);
> > + break;
> > +
> > + case S6SY761_EVENT_ID_STATUS:
> > + break;
> > +
> > + default:
> > + break;
> > + }
> > + }
> > +}
[...]
> > +static ssize_t s6sy761_sysfs_low_power_store(struct device *dev,
> > + struct device_attribute *attr,
> > + const char *buf, size_t len)
> > +{
> > + struct s6sy761_data *sdata = dev_get_drvdata(dev);
> > + unsigned long value;
> > + s32 ret;
> > + u8 new_status;
> > +
> > + if (kstrtoul(buf, 0, &value))
> > + return -EINVAL;
> > +
> > + /*
> > + * The device does not respond to read/write in low power,
> > + * it will enable only in case of external events (e.g. touch).
> > + * The i2c read will fail as expected if no external events occur
> > + */
>
> I am not quite sure how to parse this. Are you saying that the device in
> low power mode will wake up when touched? Then your runtime PM
> implementation seems incomplete.
I was startled as well when I saw this working. It cannot be in
the PM runtime because the device would freeze (unless is
touched). I don't know if it's a bug in the firmware or this is
how it meant to be.
> In any case, I'd rather we did not expose this state as a custom
> attribute.
I can remove it completely, indeed I don't see much use of it.
[...]
> > + sdata->devid = buffer[1] << 8 | buffer[2];
>
> get_unaligned_be16()?
Thanks!
[...]
> > + /* check if both max_x and max_y have a value */
> > + if (unlikely(!sdata->prop.max_x || !sdata->prop.max_y))
>
> This is not in hot path, we do not need unlikely() here.
OK, Thanks!
> > + return -EINVAL;
> > +
> > + /* if no tx channels defined, at least keep one */
> > + sdata->tx_channel = !buffer[8] ? 1 : buffer[8];
>
> sdata->tx_channel = max(buffer[8], 1);
Thanks!
[...]
> > +static int s6sy761_probe(struct i2c_client *client,
> > + const struct i2c_device_id *id)
> > +{
[...]
> > + err = devm_request_threaded_irq(&client->dev, client->irq, NULL,
> > + s6sy761_irq_handler,
> > + IRQF_TRIGGER_LOW | IRQF_ONESHOT,
> > + "s6sy761_irq", sdata);
> > + if (err)
> > + return err;
> > +
> > + disable_irq(client->irq);
>
> Can you request IRQ after allocating and setting up the input device?
> Then you do not need to check for its presence in the interrupt handler.
The reason I do it here is because the x and y are embedded in
the device itself. This means that I first need to enable the
device, read x and y and then register the input device.
At power up I might expect an interrupt coming, thus I need to
check if 'input' is not 'NULL'.
[...]
> > + err = sysfs_create_group(&sdata->client->dev.kobj,
> > + &s6sy761_attribute_group);
>
> We have devm_device_add_groups() now.
Thanks! I will patch also the other driver I sent, then (the
stmfts).
[...]
> Thanks.
Thank you!
Andi
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