Re: [PATCHv4 1/6] input/cma3000_d0x: Support devices without pdata

[Grant Likely <grant.likely@secretlab.ca>]

On Mon, Oct 24, 2011 at 10:21:11PM +0200, Ricardo Ribalda Delgado wrote:
> Architectures based on device-tree does not have platform data
> associated to the spi/i2c devices. Instead they can have some of
> the options embedded in the device tree.
> 
> This patch allows the cma3000  driver to get the configuration
> from the platform_data, the device tree, or in the wort case,
> just use a default configuration.
> 
> ---

Drop this line, git cuts everything below a '---' line from the commit text.

> 
> v3: Fixes suggested by Jonathan Cameron
>     -Code style
> 
> v3: Fixes suggested by Jonathan Cameron
>     -Add support for the device tree
> 
> v2: Fixes suggested by Jonathan Cameron
>     -Spelling
>     -Simplify pdata!=NULL check
> 
> Signed-off-by: Ricardo Ribalda Delgado <ricardo.ribalda@gmail.com>
> ---
>  drivers/input/misc/cma3000_d0x.c |   86 +++++++++++++++++++++++++++++++++-----
>  1 files changed, 75 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/input/misc/cma3000_d0x.c b/drivers/input/misc/cma3000_d0x.c
> index 1633b63..e66036d 100644
> --- a/drivers/input/misc/cma3000_d0x.c
> +++ b/drivers/input/misc/cma3000_d0x.c
> @@ -23,6 +23,7 @@
>  #include <linux/slab.h>
>  #include <linux/input.h>
>  #include <linux/input/cma3000.h>
> +#include <linux/of.h>
>  
>  #include "cma3000_d0x.h"
>  
> @@ -62,9 +63,21 @@
>  #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;
> +	struct cma3000_platform_data pdata;
>  
>  	struct device *dev;
>  	struct input_dev *input_dev;
> @@ -182,7 +195,7 @@ static int cma3000_reset(struct cma3000_accl_data *data)
>  
>  static int cma3000_poweron(struct cma3000_accl_data *data)
>  {
> -	const struct cma3000_platform_data *pdata = data->pdata;
> +	struct cma3000_platform_data *pdata = &data->pdata;
>  	u8 ctrl = 0;
>  	int ret;
>  
> @@ -280,22 +293,57 @@ void cma3000_resume(struct cma3000_accl_data *data)
>  }
>  EXPORT_SYMBOL(cma3000_resume);
>  
> +#ifdef CONFIG_OF
> +void cma3000_get_pdata_of(struct device *dev, struct cma3000_accl_data *data)
> +{
> +	const __be32 *property;
> +	int len;
> +
> +	property = of_get_property(dev->of_node, "vti,mdthr", &len);
> +	if (property && len == sizeof(int))
> +		data->pdata.mdthr = be32_to_cpup(property);
> +
> +	property = of_get_property(dev->of_node, "vti,mdfftmr", &len);
> +	if (property && len == sizeof(int))
> +		data->pdata.mdfftmr = be32_to_cpup(property);
> +
> +	property = of_get_property(dev->of_node, "vti,mode", &len);
> +	if (property && len == sizeof(int))
> +		data->pdata.mode = be32_to_cpup(property);
> +
> +	property = of_get_property(dev->of_node, "vti,g_range", &len);
> +	if (property && len == sizeof(int))
> +		data->pdata.g_range = be32_to_cpup(property);
> +
> +	property = of_get_property(dev->of_node, "vti,fuzz_x", &len);
> +	if (property && len == sizeof(int))
> +		data->pdata.fuzz_x = be32_to_cpup(property);
> +
> +	property = of_get_property(dev->of_node, "vti,fuzz_y", &len);
> +	if (property && len == sizeof(int))
> +		data->pdata.fuzz_y = be32_to_cpup(property);
> +
> +	property = of_get_property(dev->of_node, "vti,fuzz_z", &len);
> +	if (property && len == sizeof(int))
> +		data->pdata.fuzz_z = be32_to_cpup(property);
> +
> +	property = of_get_property(dev->of_node, "vti,irqflags", &len);
> +	if (property && len == sizeof(int))
> +		data->pdata.irqflags = be32_to_cpup(property);

This binding needs documentation before it can be merged.

> +
> +	return;
> +}
> +#endif

No of_device_id match table to match against compatible values?

> +
>  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;
> +	struct cma3000_platform_data *pdata;
>  	struct cma3000_accl_data *data;
>  	struct input_dev *input_dev;
>  	int rev;
>  	int error;
>  
> -	if (!pdata) {
> -		dev_err(dev, "platform data not found\n");
> -		error = -EINVAL;
> -		goto err_out;
> -	}
> -
> -
>  	/* if no IRQ return error */
>  	if (irq == 0) {
>  		error = -EINVAL;
> @@ -309,10 +357,26 @@ struct cma3000_accl_data *cma3000_init(struct device *dev, int irq,
>  		goto err_free_mem;
>  	}
>  
> +	/*Init platform data*/
> +	if (dev->platform_data != NULL) {
> +		memcpy(&data->pdata, dev->platform_data, sizeof(data->pdata));
> +	} else {
> +		memcpy(&data->pdata, &cma3000_default_pdata,
> +				sizeof(data->pdata));
> +		#ifdef CONFIG_OF
> +		if (dev->of_node != NULL)
> +			cma3000_get_pdata_of(dev, data);
> +		 else
> +			dev_info(dev, "platform data not found, using default\n");
> +		#else
> +		dev_info(dev, "platform data not found, using default\n");
> +		#endif
> +	}
> +	pdata = &data->pdata;
> +
>  	data->dev = dev;
>  	data->input_dev = input_dev;
>  	data->bus_ops = bops;
> -	data->pdata = pdata;
>  	data->irq = irq;
>  	mutex_init(&data->mutex);
>  
> -- 
> 1.7.7
>