linux-kernel - Re: [PATCHv2 1/7] input/cma3000_d0x: Support devices without pdata

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Date:	Tue, 18 Oct 2011 13:53:45 +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: [PATCHv2 1/7] input/cma3000_d0x: Support devices without pdata

On 10/18/11 13:06, Ricardo Ribalda Delgado wrote:
> Architectures based on device-tree does not have platform data
> associated to the spi/i2c devices.
> This patch allows those architectures to use the cma3000 driver with
> a default configuration.
Fine except for this description. Looks to be a perfectly reasonable
way of specifying these in DT.  So fix that and I'm happy.
Whoever wants to pass this in from DT can do a patch for it!
> 
> ---
> 
> v2: Fixes suggested by Jonathan Cameron
>     -Spelling
>     -Simplify pdata!=NULL check
> 
> Signed-off-by: Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>
Acked-by: Jonathan Cameron <jic23@....ac.uk>
> ---
>  drivers/input/misc/cma3000_d0x.c |   20 +++++++++++++++-----
>  1 files changed, 15 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/input/misc/cma3000_d0x.c b/drivers/input/misc/cma3000_d0x.c
> index 1633b63..f2e87e3 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,
> +};
> +
>  struct cma3000_accl_data {
>  	const struct cma3000_bus_ops *bus_ops;
>  	const struct cma3000_platform_data *pdata;
> @@ -289,13 +301,11 @@ struct cma3000_accl_data *cma3000_init(struct device *dev, int irq,
>  	int rev;
>  	int error;
>  
> -	if (!pdata) {
> -		dev_err(dev, "platform data not found\n");
> -		error = -EINVAL;
> -		goto err_out;
> +	if (pdata == NULL) {
> +		dev_info(dev, "platform data not found, using default\n");
> +		pdata = &cma3000_default_pdata;
>  	}
>  
> -
>  	/* if no IRQ return error */
>  	if (irq == 0) {
>  		error = -EINVAL;

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