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SubjectRe: [PATCH V3] Input: pm8941-pwrkey: add resin key capabilities
On Fri, Mar 23, 2018 at 12:14:22PM -0700, Trilok Soni wrote:
> 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?

It should be fine, input devices properly allocated (with
input_allocate_device() or devm- version) are able to accept events even
if input device has not been registered yet. It is and advertised
feature:

drivers/input/input.c:

"
* input_event() - report new input event
...
* NOTE: input_event() may be safely used right after input device was
* allocated with input_allocate_device(), even before it is registered
* with input_register_device(), but the event will not reach any of the
* input handlers. Such early invocation of input_event() may be used
* to 'seed' initial state of a switch or initial position of absolute
* axis, etc.
"

Thanks.

--
Dmitry

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