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SubjectRe: [PATCH V3] Input: pm8941-pwrkey: add resin key capabilities
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Hi Tirupathi,

>
> +static irqreturn_t pm8941_resinkey_irq(int irq, void *_data)
> +{
> + struct pm8941_pwrkey *pwrkey = _data;
> + unsigned int sts;
> + int error;
> + u32 key_code = pwrkey->resin_key_code;
> +
> + error = regmap_read(pwrkey->regmap,
> + pwrkey->baseaddr + PON_RT_STS, &sts);
> + if (error)
> + return IRQ_HANDLED;
> +
> + input_report_key(pwrkey->input, key_code, !!(sts & PON_RESIN_N_SET));
> + input_sync(pwrkey->input);
> +
> + return IRQ_HANDLED;
> +}
> +
> static int __maybe_unused pm8941_pwrkey_suspend(struct device *dev)
> {
> struct pm8941_pwrkey *pwrkey = dev_get_drvdata(dev);
> @@ -153,9 +175,56 @@ static int __maybe_unused pm8941_pwrkey_resume(struct device *dev)
> static SIMPLE_DEV_PM_OPS(pm8941_pwr_key_pm_ops,
> pm8941_pwrkey_suspend, pm8941_pwrkey_resume);
>
> +static int pm8941_resin_key_init(struct pm8941_pwrkey *pwrkey,
> + struct device_node *np)
> +{
> + int error, irq;
> + bool pull_up;
> +
> + /*
> + * Get the standard-key parameters. This might not be
> + * specified if there is no key mapping on the reset line.
> + */
> + error = of_property_read_u32(np, "linux,code", &pwrkey->resin_key_code);
> + if (error) {
> + dev_err(pwrkey->dev, "failed to read key-code for resin key\n");
> + return error;
> + }
> +
> + pull_up = of_property_read_bool(np, "bias-pull-up");
> +
> + irq = irq_of_parse_and_map(np, 0);
> + if (irq < 0) {
> + dev_err(pwrkey->dev, "failed to get resin irq\n");
> + return -EINVAL;
> + }
> +
> + /* Register key configuration */
> + input_set_capability(pwrkey->input, EV_KEY, pwrkey->resin_key_code);
> +
> + error = regmap_update_bits(pwrkey->regmap,
> + pwrkey->baseaddr + PON_PULL_CTL,
> + PON_RESIN_PULL_UP,
> + pull_up ? PON_RESIN_PULL_UP : 0);
> + if (error) {
> + dev_err(pwrkey->dev, "failed to set resin pull: %d\n", error);
> + return error;
> + }
> +
> + error = devm_request_threaded_irq(pwrkey->dev, irq, NULL,
> + pm8941_resinkey_irq, IRQF_ONESHOT,
> + "pm8941_resinkey", pwrkey);
> + if (error)
> + dev_err(pwrkey->dev, "failed requesting resin key IRQ: %d\n",
> + error);
> +
> + return error;
> +}
> +
> static int pm8941_pwrkey_probe(struct platform_device *pdev)
> {
> struct pm8941_pwrkey *pwrkey;
> + struct device_node *np = NULL;
> bool pull_up;
> u32 req_delay;
> int error;
> @@ -241,6 +310,18 @@ static int pm8941_pwrkey_probe(struct platform_device *pdev)
> return error;
> }
>
> + np = of_find_node_by_name(pdev->dev.of_node, "resin");
> + if (np) {
> + /* resin key capabilities are defined in device node */
> + error = pm8941_resin_key_init(pwrkey, np);


What happens if interrupts comes as soon as you have done the
key_init(..) here? I see that you are registering the input device after
it, right? Looks like you should do this at the end of probe?

> + of_node_put(np);
> + if (error) {
> + dev_err(&pdev->dev, "failed resin key initialization: %d\n",
> + error);
> + return error;
> + }
> + }
> +
> error = input_register_device(pwrkey->input);
> if (error) {
> dev_err(&pdev->dev, "failed to register input device: %d\n",
>

--
---Trilok Soni
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a
Linux Foundation Collaborative Project

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