linux-kernel - Re: [PATCH 1/5] input/cma3000_d0x: Support devices without pdata

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Date:	Tue, 18 Oct 2011 09:32:25 +0100
From:	Jonathan Cameron <jic23@....ac.uk>
To:	Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>
CC:	dmitry.torokhov@...il.com, sameo@...ux.intel.com,
	peter.ujfalusi@...com, aghayal@...eaurora.org, david@...deman.nu,
	Shubhrajyoti@...com, saaguirre@...com, hemanthv@...com,
	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/5] input/cma3000_d0x: Support devices without pdata

On 10/18/11 09:28, Ricardo Ribalda Delgado wrote:
> Architechtures based on device-tree does not have platform data
check your spelling.
> associated to the spi/i2c devices.
> This patch allows those architechtures to use the cma3000 driver with
> a default configuration.
> 
> Signed-off-by: Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>
> ---
>  drivers/input/misc/cma3000_d0x.c |   21 +++++++++++++++++++--
>  1 files changed, 19 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/input/misc/cma3000_d0x.c b/drivers/input/misc/cma3000_d0x.c
> index 1633b63..2f993d5 100644
> --- a/drivers/input/misc/cma3000_d0x.c
> +++ b/drivers/input/misc/cma3000_d0x.c
> @@ -62,6 +62,18 @@
>  #define BIT_TO_2G  18
>  #define BIT_TO_8G  71
>  
> +static struct cma3000_platform_data cma3000_default_pdata = {
> +	.mdthr = 0x8,
> +	.mdfftmr = 0x33,
> +	.ffthr = 0x8,
> +	.mode = CMAMODE_MEAS400,
> +	.g_range = CMARANGE_2G,
> +	.fuzz_x = BIT_TO_2G,
> +	.fuzz_y = BIT_TO_2G,
> +	.fuzz_z = BIT_TO_2G,
> +	.irqflags = 0,
> +};
I'm not that familiar with DT yet, but surely there is a means to supplying
the equivalent data?  I'd prefer to see that provided here as well.
> +
>  struct cma3000_accl_data {
>  	const struct cma3000_bus_ops *bus_ops;
>  	const struct cma3000_platform_data *pdata;
> @@ -283,19 +295,24 @@ EXPORT_SYMBOL(cma3000_resume);
>  struct cma3000_accl_data *cma3000_init(struct device *dev, int irq,
>  				       const struct cma3000_bus_ops *bops)
>  {
> -	const struct cma3000_platform_data *pdata = dev->platform_data;
> +	const struct cma3000_platform_data *pdata;
Leave this line alone....
>  	struct cma3000_accl_data *data;
>  	struct input_dev *input_dev;
>  	int rev;
>  	int error;
>  
> +	if (!dev->platform_data) {
> +		dev_info(dev, "platform data not found, using default\n");
> +		pdata = &cma3000_default_pdata;
> +	} else
> +		pdata = dev->platform_data;
> +
and this becomes

if (pdata == NULL) {
	dev_info(dev, "platform data not found, using default\n");
	pdata = &cma3000_default_pdata;
}

>  	if (!pdata) {
>  		dev_err(dev, "platform data not found\n");
>  		error = -EINVAL;
>  		goto err_out;
>  	}
This can't happen now so get rid of the test.
>  
> -
>  	/* if no IRQ return error */
>  	if (irq == 0) {
>  		error = -EINVAL;

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