On 31.07.2012 15:56, Daniel Mack wrote:
> On 31.07.2012 08:12, Dmitry Torokhov wrote:
>> Still, I do not line the copying of pdata over, maybe we coudl have
>> something like the patch below?
Was that merged yet? Sorry, just want to forget about it :)
>
> [...]
>
>> diff --git a/drivers/input/misc/rotary_encoder.c b/drivers/input/misc/rotary_encoder.c
>> index ea51265..0f9d746 100644
>> --- a/drivers/input/misc/rotary_encoder.c
>> +++ b/drivers/input/misc/rotary_encoder.c
>> @@ -24,6 +24,8 @@
>> #include <linux/gpio.h>
>> #include <linux/rotary_encoder.h>
>> #include <linux/slab.h>
>> +#include <linux/of_platform.h>
>> +#include <linux/of_gpio.h>
>>
>> #define DRV_NAME "rotary-encoder"
>>
>> @@ -140,6 +142,56 @@ static irqreturn_t rotary_encoder_half_period_irq(int irq, void *dev_id)
>> return IRQ_HANDLED;
>> }
>>
>> +#ifdef CONFIG_OF
>> +static struct of_device_id rotary_encoder_of_match[] = {
>> + { .compatible = "rotary-encoder", },
>> + { },
>> +};
>> +MODULE_DEVICE_TABLE(of, rotary_encoder_of_match);
>> +
>> +static struct rotary_encoder_platform_data * __devinit
>> +rotary_encoder_parse_dt(struct device *dev)
>> +{
>> + const struct of_device_id *of_id =
>> + of_match_device(rotary_encoder_of_match, dev);
>> + struct device_node *np = dev->of_node;
>> + struct rotary_encoder_platform_data *pdata;
>> + enum of_gpio_flags flags;
>> +
>> + if (!of_id || !np)
>> + return NULL;
>> +
>> + pdata = kzalloc(sizeof(struct rotary_encoder_platform_data),
>> + GFP_KERNEL);
>> + if (!pdata)
>> + return ERR_PTR(-ENOMEM);
>> +
>> + of_property_read_u32(np, "rotary-encoder,steps", &pdata->steps);
>> + of_property_read_u32(np, "linux,axis", &pdata->axis);
>> +
>> + pdata->gpio_a = of_get_gpio_flags(np, 0, &flags);
>> + pdata->inverted_a = flags & OF_GPIO_ACTIVE_LOW;
>> +
>> + pdata->gpio_b = of_get_gpio_flags(np, 1, &flags);
>> + pdata->inverted_b = flags & OF_GPIO_ACTIVE_LOW;
>> +
>> + pdata->relative_axis = !!of_get_property(np,
>> + "rotary-encoder,relative-axis", NULL);
>> + pdata->rollover = !!of_get_property(np,
>> + "rotary-encoder,rollover", NULL);
>> + pdata->half_period = !!of_get_property(np,
>> + "rotary-encoder,half-period", NULL))
>
> Syntax error.
>
>> +
>> + return pdata;
>> +}
>> +#else
>> +static inline struct rotary_encoder_platform_data *
>> +rotary_encoder_parse_dt(struct device *dev)
>> +{
>> + return NULL;
>> +}
>> +#endif
>> +
>> static int __devinit rotary_encoder_probe(struct platform_device *pdev)
>> {
>> struct device *dev = &pdev->dev;
>> @@ -150,14 +202,19 @@ static int __devinit rotary_encoder_probe(struct platform_device *pdev)
>> int err;
>>
>> if (!pdata) {
>> - dev_err(&pdev->dev, "missing platform data\n");
>> - return -ENOENT;
>> + pdata = rotary_encoder_parse_dt(dev);
>> + if (IS_ERR(pdata))
>> + return PTR_ERR(pdata);
>> +
>> + if (!pdata) {
>> + dev_err(dev, "missing platform data\n");
>> + return -EINVAL;
>> + }
>
> Well, then you would only parse DT parameters in case of no kernel
> provided struct. I thought you were up to a solution where board file
> data could override just parts of the DT provided information. But I
> don't think the latter would be any useful anyway, so I'm happy with
> your solution :)
>
>
> Thanks for your help,
> Daniel
>
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