linux-kernel - Re: [PATCH] Input: tsc200x - Report proper input

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Message-ID: <20160720065405.GD3792@amd>
Date:	Wed, 20 Jul 2016 08:54:05 +0200
From:	Pavel Machek <pavel@....cz>
To:	Michael Welling <mwelling@...e.org>
Cc:	kernel list <linux-kernel@...r.kernel.org>,
	linux-input@...r.kernel.org, pali.rohar@...il.com, sre@...nel.org,
	ivo.g.dimitrov.75@...il.com, patrikbachan@...il.com,
	serge@...lyn.com, Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Aaro Koskinen <aaro.koskinen@....fi>
Subject: Re: [PATCH] Input: tsc200x - Report proper input_dev name

On Wed 2016-07-20 01:50:24, Michael Welling wrote:
> On Wed, Jul 20, 2016 at 08:31:06AM +0200, Pavel Machek wrote:
> > Hi!
> > 
> > > Passes input_id struct to the the common probe function for the tsc200x drivers
> > > instead of just the bustype.
> > > 
> > > This allows for the use of the product variable to set the input_dev->name
> > > variable according to the type of touchscreen used.
> > > 
> > > Signed-off-by: Michael Welling <mwelling@...e.org>
> > > ---
> > >  drivers/input/touchscreen/tsc2004.c      | 7 ++++++-
> > >  drivers/input/touchscreen/tsc2005.c      | 7 ++++++-
> > >  drivers/input/touchscreen/tsc200x-core.c | 7 ++++---
> > >  drivers/input/touchscreen/tsc200x-core.h | 2 +-
> > >  4 files changed, 17 insertions(+), 6 deletions(-)
> > > 
> > > diff --git a/drivers/input/touchscreen/tsc2004.c b/drivers/input/touchscreen/tsc2004.c
> > > index 7295c19..6fe55d5 100644
> > > --- a/drivers/input/touchscreen/tsc2004.c
> > > +++ b/drivers/input/touchscreen/tsc2004.c
> > > @@ -22,6 +22,11 @@
> > >  #include <linux/regmap.h>
> > >  #include "tsc200x-core.h"
> > >  
> > > +static const struct input_id tsc2004_input_id = {
> > > +	.bustype = BUS_I2C,
> > > +	.product = 2004,
> > > +};
> > > +
> > >  static int tsc2004_cmd(struct device *dev, u8 cmd)
> > >  {
> > >  	u8 tx = TSC200X_CMD | TSC200X_CMD_12BIT | cmd;
> > > @@ -42,7 +47,7 @@ static int tsc2004_probe(struct i2c_client *i2c,
> > >  			 const struct i2c_device_id *id)
> > >  
> > >  {
> > > -	return tsc200x_probe(&i2c->dev, i2c->irq, BUS_I2C,
> > > +	return tsc200x_probe(&i2c->dev, i2c->irq, &tsc2004_input_id,
> > >  			     devm_regmap_init_i2c(i2c, &tsc200x_regmap_config),
> > >  			     tsc2004_cmd);
> > >  }
> > > diff --git a/drivers/input/touchscreen/tsc2005.c b/drivers/input/touchscreen/tsc2005.c
> > > index b9f593d..f2c5f0e 100644
> > > --- a/drivers/input/touchscreen/tsc2005.c
> > > +++ b/drivers/input/touchscreen/tsc2005.c
> > > @@ -24,6 +24,11 @@
> > >  #include <linux/regmap.h>
> > >  #include "tsc200x-core.h"
> > >  
> > > +static const struct input_id tsc2005_input_id = {
> > > +	.bustype = BUS_SPI,
> > > +	.product = 2005,
> > > +};
> > > +
> > >  static int tsc2005_cmd(struct device *dev, u8 cmd)
> > >  {
> > >  	u8 tx = TSC200X_CMD | TSC200X_CMD_12BIT | cmd;
> > > @@ -62,7 +67,7 @@ static int tsc2005_probe(struct spi_device *spi)
> > >  	if (error)
> > >  		return error;
> > >  
> > > -	return tsc200x_probe(&spi->dev, spi->irq, BUS_SPI,
> > > +	return tsc200x_probe(&spi->dev, spi->irq, &tsc2005_input_id,
> > >  			     devm_regmap_init_spi(spi, &tsc200x_regmap_config),
> > >  			     tsc2005_cmd);
> > >  }
> > > diff --git a/drivers/input/touchscreen/tsc200x-core.c b/drivers/input/touchscreen/tsc200x-core.c
> > > index 26e81d1b..5e625c4 100644
> > > --- a/drivers/input/touchscreen/tsc200x-core.c
> > > +++ b/drivers/input/touchscreen/tsc200x-core.c
> > > @@ -450,7 +450,7 @@ static void tsc200x_close(struct input_dev *input)
> > >  	mutex_unlock(&ts->mutex);
> > >  }
> > >  
> > > -int tsc200x_probe(struct device *dev, int irq, __u16 bustype,
> > > +int tsc200x_probe(struct device *dev, int irq, const struct input_id *tsc_id,
> > >  		  struct regmap *regmap,
> > >  		  int (*tsc200x_cmd)(struct device *dev, u8 cmd))
> > >  {
> > > @@ -547,9 +547,10 @@ int tsc200x_probe(struct device *dev, int irq, __u16 bustype,
> > >  	snprintf(ts->phys, sizeof(ts->phys),
> > >  		 "%s/input-ts", dev_name(dev));
> > >  
> > > -	input_dev->name = "TSC200X touchscreen";
> > > +	input_dev->name = devm_kasprintf(dev, GFP_KERNEL, "TSC%04d touchscreen",
> > > +					tsc_id->product);
> > 
> > What about:
> > 
> >      if (tsc_id->product == 2005)
> >           input_dev->name = "TSC2005 touchscreen";
> >      else
> >           input_dev->name = "TSC200X touchscreen";
> > 
> > We do want to use 'TSC2005' name for TSC2005, because compatibility,
> > but you should keep TSC200X.... because compatibility. You don't want
> > to break people's setups by going from TSC200X to TSC2004.
> 
> By same logic we shouldn't change from TSC200X back to TSC2005 because of
> people's possibly new setup in the last 9 months.

That's your, broken logic.

TSC200X->TSC2005 needs to be fixed, because people seen the TSC2005
for past few years.

TSC200X->TSC2004 is just introducing regression, because noone ever
seen TSC2004, AFAICT.

									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html