linux-kernel - Re: [PATCH v2] Input: ili210x - Set the device name according to the device model

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Message-ID: <CAOkaPuW9dkRztRxG4MQdQ_SCfQcjd8_mmMa_3=0vO9x7cqju5A@mail.gmail.com>
Date:   Wed, 8 Sep 2021 12:18:22 -0300
From:   Rogerio Pimentel <rpimentel.silva@...il.com>
To:     Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:     hansemro@...look.com, Marek Vašut <marex@...x.de>,
        linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] Input: ili210x - Set the device name according to the
 device model

On Sat, Sep 4, 2021 at 3:17 AM Dmitry Torokhov
<dmitry.torokhov@...il.com> wrote:
>
> Hi Rogerio,
>
> On Fri, Sep 03, 2021 at 01:54:48PM -0300, Rogerio Pimentel wrote:
> > Adding the device model into the device name is useful when
> > applications need to set different parameters according to the
> > touchscreen being used, e.g. X11 calibration points.
>
> Typically model would go into input->id.product and optionally
> input->id.version.
>
> >
> > Signed-off-by: Rogerio Pimentel <rpimentel.silva@...il.com>
> > ---
> >
> > Changes since v1: Get the device ID from touchscreen controller
> > instead of driver's device list.
> >
> >  drivers/input/touchscreen/ili210x.c | 11 ++++++++++-
> >  1 file changed, 10 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/input/touchscreen/ili210x.c b/drivers/input/touchscreen/ili210x.c
> > index 199cf3daec10..7a897a03ed70 100644
> > --- a/drivers/input/touchscreen/ili210x.c
> > +++ b/drivers/input/touchscreen/ili210x.c
> > @@ -19,10 +19,14 @@
> >  #define ILI251X_DATA_SIZE1   31
> >  #define ILI251X_DATA_SIZE2   20
> >
> > +#define ILI_NAME_LEN         27
> > +#define ILITEK_TS_NAME "Ilitek ILI%x%x Touchscreen"
> > +
> >  /* Touchscreen commands */
> >  #define REG_TOUCHDATA                0x10
> >  #define REG_PANEL_INFO               0x20
> >  #define REG_CALIBRATE                0xcc
> > +#define REG_TS_MODEL         0x61
> >
> >  struct ili2xxx_chip {
> >       int (*read_reg)(struct i2c_client *client, u8 reg,
> > @@ -384,6 +388,8 @@ static int ili210x_i2c_probe(struct i2c_client *client,
> >       struct input_dev *input;
> >       int error;
> >       unsigned int max_xy;
> > +     unsigned char buf[2];
> > +     char *model_name;
> >
> >       dev_dbg(dev, "Probing for ILI210X I2C Touschreen driver");
> >
> > @@ -430,7 +436,10 @@ static int ili210x_i2c_probe(struct i2c_client *client,
> >       i2c_set_clientdata(client, priv);
> >
> >       /* Setup input device */
> > -     input->name = "ILI210x Touchscreen";
> > +     input->name = ILITEK_TS_NAME;
> > +     model_name = (char *)input->name;
>
> Umm, no. Smashing RO data is not nice.
>
> > +     priv->chip->read_reg(priv->client, REG_TS_MODEL, buf, 2);
> > +     snprintf(model_name, ILI_NAME_LEN, input->name, buf[1], buf[0]);
> >       input->id.bustype = BUS_I2C;
> >
> >       /* Multi touch */
> > --
> > 2.17.1
> >
>
> Thanks.
>
I agree with the comments.
Please, discard this patch.

Rogerio
> --
> Dmitry