linux-kernel - Re: [PATCH 1/3] cap1106: Add support for various cap11xx devices

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Date:	Sun, 21 Sep 2014 15:46:48 -0700
From:	Matt Ranostay <mranostay@...il.com>
To:	Daniel Mack <daniel@...que.org>
Cc:	Kumar Gala <galak@...eaurora.org>, linux-input@...r.kernel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Rob Herring <robh+dt@...nel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [PATCH 1/3] cap1106: Add support for various cap11xx devices

On Sun, Sep 21, 2014 at 2:58 AM, Daniel Mack <daniel@...que.org> wrote:
>
> Hi,
>
> On 09/21/2014 05:01 AM, Matt Ranostay wrote:
> > Several other variants of the cap11xx device exists with a varying
> > number of capacitance detection channels. Add support for creating
> > the channels dynamically.
>
> Thanks for the patches!
>
> >
> > Signed-off-by: Matt Ranostay <mranostay@...il.com>
> > ---
> >  drivers/input/keyboard/cap1106.c | 54 +++++++++++++++++++---------------------
>
> Please also add a patch to rename the file to cap11xx.c, and make sure
> to export the patch with 'git format-patch -M' to detect the rename.
>
> > diff --git a/drivers/input/keyboard/cap1106.c b/drivers/input/keyboard/cap1106.c
> > index d70b65a..b9c43b5 100644
> > --- a/drivers/input/keyboard/cap1106.c
> > +++ b/drivers/input/keyboard/cap1106.c
> > @@ -55,8 +55,6 @@
> >  #define CAP1106_REG_MANUFACTURER_ID  0xfe
> >  #define CAP1106_REG_REVISION         0xff
> >
> > -#define CAP1106_NUM_CHN 6
> > -#define CAP1106_PRODUCT_ID   0x55
> >  #define CAP1106_MANUFACTURER_ID      0x5d
> >
> >  struct cap1106_priv {
> > @@ -64,7 +62,8 @@ struct cap1106_priv {
> >       struct input_dev *idev;
> >
> >       /* config */
> > -     unsigned short keycodes[CAP1106_NUM_CHN];
> > +     u32 *keycodes;
>
> unsigned short *, please. See below.
>
> > @@ -189,27 +188,23 @@ static int cap1106_i2c_probe(struct i2c_client *i2c_client,
> >       struct cap1106_priv *priv;
> >       struct device_node *node;
> >       int i, error, irq, gain = 0;
> > -     unsigned int val, rev;
> > -     u32 gain32, keycodes[CAP1106_NUM_CHN];
> > +     unsigned int val, prod, rev;
> > +     u32 gain32;
> >
> >       priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
> >       if (!priv)
> >               return -ENOMEM;
> >
> > +     priv->num_channels = (unsigned long) id->driver_data;
>
> priv->num_channels is unsigned int.
>
> Also, a BUG_ON(!priv->num_channels) wouldn't harm.

Oops. Will fix..

>
> > +     priv->keycodes = devm_kzalloc(dev,
> > +             sizeof(u32) * priv->num_channels, GFP_KERNEL);
>
> Use devm_kcalloc() to allocate an array.
>
> > @@ -235,17 +234,12 @@ static int cap1106_i2c_probe(struct i2c_client *i2c_client,
> >                       dev_err(dev, "Invalid sensor-gain value %d\n", gain32);
> >       }
> >
> > -     BUILD_BUG_ON(ARRAY_SIZE(keycodes) != ARRAY_SIZE(priv->keycodes));
> > -
> >       /* Provide some useful defaults */
> > -     for (i = 0; i < ARRAY_SIZE(keycodes); i++)
> > -             keycodes[i] = KEY_A + i;
> > +     for (i = 0; i < priv->num_channels; i++)
> > +             priv->keycodes[i] = KEY_A + i;
> >
> >       of_property_read_u32_array(node, "linux,keycodes",
> > -                                keycodes, ARRAY_SIZE(keycodes));
> > -
> > -     for (i = 0; i < ARRAY_SIZE(keycodes); i++)
> > -             priv->keycodes[i] = keycodes[i];
> > +                               priv->keycodes, priv->num_channels);
>
> Hmm, no. Internally, you have to store the keycodes as unsigned short,
> otherwise EVIOC{G|S}KEYCODE from usespace doesn't work.
>
> of_property_read_u16_array() should work here for unsigned short, I
> guess. Otherwise, you'd have to open-code the routine.
>
Ok I'l test that.

> > @@ -313,12 +307,16 @@ static int cap1106_i2c_probe(struct i2c_client *i2c_client,
> >
> >  static const struct of_device_id cap1106_dt_ids[] = {
> >       { .compatible = "microchip,cap1106", },
> > +     { .compatible = "microchip,cap1126", },
> > +     { .compatible = "microchip,cap1188", },
>
> Hmm, how can that work unless you set .data to the number of channels
> here? Did you test that with a DT-enabled board?
>
Yes it was tested on a BBB.  The num_channels is set from cap1106_i2c_ids

>
> Thanks,
> Daniel
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