Re: [PATCH v6 2/3] input: pm8941-pwrkey: Abstract register offsets and event code

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On Tue, Jul 31, 2018 at 10:18:06AM +0530, Vinod Koul wrote:
> In order to support resin thru the pwrkey driver (they are very
> similar in nature) we need to abstract the handling in this driver.
> 
> First we abstract pull_up_bit and status_bit along in driver data.
> The event code sent for key events is quiried from DT.
> 
> Since the device can be child of pon lookup regmap and reg from
> parent if lookup fails (we are child).
> 
> Reviewed-by: Bjorn Andersson <bjorn.andersson@xxxxxxxxxx>
> Signed-off-by: Vinod Koul <vkoul@xxxxxxxxxx>
> ---
>  drivers/input/misc/pm8941-pwrkey.c | 61 ++++++++++++++++++++++++++++++--------
>  1 file changed, 48 insertions(+), 13 deletions(-)
> 
> diff --git a/drivers/input/misc/pm8941-pwrkey.c b/drivers/input/misc/pm8941-pwrkey.c
> index 18ad956454f1..2047e34c0982 100644
> --- a/drivers/input/misc/pm8941-pwrkey.c
> +++ b/drivers/input/misc/pm8941-pwrkey.c
> @@ -20,6 +20,7 @@
>  #include <linux/log2.h>
>  #include <linux/module.h>
>  #include <linux/of.h>
> +#include <linux/of_device.h>
>  #include <linux/platform_device.h>
>  #include <linux/reboot.h>
>  #include <linux/regmap.h>
> @@ -42,6 +43,10 @@
>  #define PON_DBC_CTL			0x71
>  #define  PON_DBC_DELAY_MASK		0x7
>  
> +struct pm8941_data {
> +	unsigned int pull_up_bit;
> +	unsigned int status_bit;
> +};
>  
>  struct pm8941_pwrkey {
>  	struct device *dev;
> @@ -52,6 +57,9 @@ struct pm8941_pwrkey {
>  
>  	unsigned int revision;
>  	struct notifier_block reboot_notifier;
> +
> +	u32 code;
> +	const struct pm8941_data *data;
>  };
>  
>  static int pm8941_reboot_notify(struct notifier_block *nb,
> @@ -124,7 +132,8 @@ static irqreturn_t pm8941_pwrkey_irq(int irq, void *_data)
>  	if (error)
>  		return IRQ_HANDLED;
>  
> -	input_report_key(pwrkey->input, KEY_POWER, !!(sts & PON_KPDPWR_N_SET));
> +	input_report_key(pwrkey->input, pwrkey->code,
> +			 sts & pwrkey->data->status_bit);
>  	input_sync(pwrkey->input);
>  
>  	return IRQ_HANDLED;
> @@ -157,6 +166,7 @@ static int pm8941_pwrkey_probe(struct platform_device *pdev)
>  {
>  	struct pm8941_pwrkey *pwrkey;
>  	bool pull_up;
> +	struct device *parent;
>  	u32 req_delay;
>  	int error;
>  
> @@ -175,12 +185,30 @@ static int pm8941_pwrkey_probe(struct platform_device *pdev)
>  		return -ENOMEM;
>  
>  	pwrkey->dev = &pdev->dev;
> +	pwrkey->data = of_device_get_match_data(&pdev->dev);
>  
> -	pwrkey->regmap = dev_get_regmap(pdev->dev.parent, NULL);
> +	parent = pdev->dev.parent;
> +	pwrkey->regmap = dev_get_regmap(parent, NULL);
>  	if (!pwrkey->regmap) {
> -		dev_err(&pdev->dev, "failed to locate regmap\n");
> -		return -ENODEV;
> +		/*
> +		 * we failed to get regmap for parent
> +		 * Check if we are child on pon and read regmap and reg from
> +		 * parent
> +		 */
> +		pwrkey->regmap = dev_get_regmap(parent->parent, NULL);
> +		if (!pwrkey->regmap) {
> +			dev_err(&pdev->dev, "failed to locate regmap\n");
> +			return -ENODEV;
> +		}
> +
> +		error = of_property_read_u32(parent->of_node,
> +					     "reg", &pwrkey->baseaddr);
> +	} else {
> +		error = of_property_read_u32(pdev->dev.of_node, "reg",
> +					     &pwrkey->baseaddr);
>  	}
> +	if (error)
> +		return error;
>  
>  	pwrkey->irq = platform_get_irq(pdev, 0);
>  	if (pwrkey->irq < 0) {
> @@ -188,11 +216,6 @@ static int pm8941_pwrkey_probe(struct platform_device *pdev)
>  		return pwrkey->irq;
>  	}
>  
> -	error = of_property_read_u32(pdev->dev.of_node, "reg",
> -				     &pwrkey->baseaddr);
> -	if (error)
> -		return error;
> -
>  	error = regmap_read(pwrkey->regmap, pwrkey->baseaddr + PON_REV2,
>  			    &pwrkey->revision);
>  	if (error) {
> @@ -200,13 +223,20 @@ static int pm8941_pwrkey_probe(struct platform_device *pdev)
>  		return error;
>  	}
>  
> +	error = of_property_read_u32(pdev->dev.of_node, "linux,code",
> +				     &pwrkey->code);
> +	if (error) {
> +		dev_info(&pdev->dev, "no linux,code assuming power%d\n", error);

I changed this to dev_dbg() and applied, thank you.

> +		pwrkey->code = KEY_POWER;
> +	}
> +
>  	pwrkey->input = devm_input_allocate_device(&pdev->dev);
>  	if (!pwrkey->input) {
>  		dev_dbg(&pdev->dev, "unable to allocate input device\n");
>  		return -ENOMEM;
>  	}
>  
> -	input_set_capability(pwrkey->input, EV_KEY, KEY_POWER);
> +	input_set_capability(pwrkey->input, EV_KEY, pwrkey->code);
>  
>  	pwrkey->input->name = "pm8941_pwrkey";
>  	pwrkey->input->phys = "pm8941_pwrkey/input0";
> @@ -225,8 +255,8 @@ static int pm8941_pwrkey_probe(struct platform_device *pdev)
>  
>  	error = regmap_update_bits(pwrkey->regmap,
>  				   pwrkey->baseaddr + PON_PULL_CTL,
> -				   PON_KPDPWR_PULL_UP,
> -				   pull_up ? PON_KPDPWR_PULL_UP : 0);
> +				   pwrkey->data->pull_up_bit,
> +				   pull_up ? pwrkey->data->pull_up_bit : 0);
>  	if (error) {
>  		dev_err(&pdev->dev, "failed to set pull: %d\n", error);
>  		return error;
> @@ -271,8 +301,13 @@ static int pm8941_pwrkey_remove(struct platform_device *pdev)
>  	return 0;
>  }
>  
> +static const struct pm8941_data pwrkey_data = {
> +	.pull_up_bit = PON_KPDPWR_PULL_UP,
> +	.status_bit = PON_KPDPWR_N_SET,
> +};
> +
>  static const struct of_device_id pm8941_pwr_key_id_table[] = {
> -	{ .compatible = "qcom,pm8941-pwrkey" },
> +	{ .compatible = "qcom,pm8941-pwrkey", .data = &pwrkey_data },
>  	{ }
>  };
>  MODULE_DEVICE_TABLE(of, pm8941_pwr_key_id_table);
> -- 
> 2.14.4
> 

-- 
Dmitry
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