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

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Date:	Sun, 21 Sep 2014 11:58:33 +0200
From:	Daniel Mack <daniel@...que.org>
To:	Matt Ranostay <mranostay@...il.com>, galak@...eaurora.org,
	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
	dmitry.torokhov@...il.com, robh+dt@...nel.org
CC:	devicetree@...r.kernel.org
Subject: Re: [PATCH 1/3] cap1106: Add support for various cap11xx devices

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.

> +	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.

> @@ -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?


Thanks,
Daniel
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