Re: [PATCH v2] Input: driver for the Goodix touchpanel

[Dmitry Torokhov <dmitry.torokhov@gmail.com>]

On Tue, Oct 28, 2014 at 06:55:21PM +0100, Bastien Nocera wrote:
> On Tue, 2014-10-07 at 13:58 -0700, Dmitry Torokhov wrote:
> > On Wed, Sep 24, 2014 at 04:43:58PM +0200, Bastien Nocera wrote:
> > > +static irqreturn_t goodix_ts_irq_handler(int irq, void *dev_id)
> > > +{
> > > +	struct goodix_ts_data *ts = dev_id;
> > > +	u8  end_cmd[1] = {0};
> > > +
> > > +	goodix_process_events(ts);
> > > +
> > > +	if (goodix_i2c_write(ts->client,
> > > +				GOODIX_READ_COOR_ADDR, end_cmd, 1) < 0)
> > > +		dev_err(&ts->client->dev, "I2C write end_cmd error");
> > 
> > I am not happy that we need to allocate/deallocate memory for each
> > interrupt. We only write one command to the driver, we could simply use
> > i2c_master_send() with a constant buffer.
> 
> Sure. But I've split up the patch you sent us, and committed the
> different bits separately in:
> https://github.com/hadess/gt9xx/commits/master
> 
> And this one commit about removing goodix_i2c_write():
> https://github.com/hadess/gt9xx/commit/146b4cc2eed5c67bcf1cb91e845bf9f97da4be1e
> 
> Breaks the driver.

Ah, I see. In end_cmd I encoded the address as little endian, whereas it
needs to be beg endian. Just swap "GOODIX_READ_COOR_ADDR & 0xff" and
"GOODIX_READ_COOR_ADDR >> 8" around and I thin kit will work.

Thanks.

-- 
Dmitry