On Thu, 28 Apr 2022 14:30:06 -0700
Guenter Roeck <linux@xxxxxxxxxxxx> wrote:
> On 4/28/22 14:09, Ruslan Zalata wrote:
> > Some Allwinner SoCs like A13, A20 or T2 are equipped with two-channel
> > low rate (6 bit) ADC that is often used for extra keys. There's a driver
> > for that already implementing standard input device, but it has these
> > limitations: 1) it cannot be used for general ADC data equisition, and
>
> acquisition
>
> > 2) it uses only one LRADC channel of two available.
> >
> > This driver provides basic hwmon interface to both channels of LRADC on
> > such Allwinner SoCs.
> >
> > Signed-off-by: Ruslan Zalata <rz@xxxxxxxxxxx>
>
> Ok, next phase of review.
>
One thing noticed whilst randomly glancing at this patch.
> > +#ifdef CONFIG_PM
> > +static int sun4i_lradc_resume(struct device *dev)
> > +{
> > + struct sun4i_lradc_data *lradc = dev_get_drvdata(dev);
> > +
> > + return sun4i_lradc_start(lradc);
> > +}
> > +
> > +static int sun4i_lradc_suspend(struct device *dev)
> > +{
> > + struct sun4i_lradc_data *lradc = dev_get_drvdata(dev);
> > +
> > + sun4i_lradc_stop(lradc);
> > + return 0;
> > +}
> > +
> > +#define SUN4I_LRADC_DEV_PM_OPS (&sun4i_lradc_dev_pm_ops)
> > +#else
> > +#define SUN4I_LRADC_DEV_PM_OPS NULL
> > +#endif /* CONFIG_PM */
> > +
> > +static const struct dev_pm_ops sun4i_lradc_dev_pm_ops = {
We have much better infrastructure for this these days.
Take a look at DEFINE_SIMPLE_DEV_PM_OPS()
and pm_sleep_ptr()
Those two in combination will let you get rid of all the ifdef stuff
here by letting the compiler remove the unused code automatically.
> > + .suspend = sun4i_lradc_suspend,
> > + .resume = sun4i_lradc_resume,
> > +};
> > +
> > +static const struct of_device_id sun4i_lradc_of_match[] = {
> > + { .compatible = "allwinner,sun4i-a10-lradc-keys", .data = &variant_sun4i_a10_lradc},
> > + { /* sentinel */ }
> > +};
> > +MODULE_DEVICE_TABLE(of, sun4i_lradc_of_match);
> > +
> > +static struct platform_driver sun4i_lradc_driver = {
> > + .driver = {
> > + .name = "sun4i-lradc-hwmon",
> > + .of_match_table = of_match_ptr(sun4i_lradc_of_match),
> > + .pm = SUN4I_LRADC_DEV_PM_OPS,
> > + },
> > + .probe = sun4i_lradc_probe,
> > +};
> > +
> > +module_platform_driver(sun4i_lradc_driver);
> > +
> > +MODULE_DESCRIPTION("Allwinner A13/A20 LRADC hwmon driver");
> > +MODULE_AUTHOR("Ruslan Zalata <rz@xxxxxxxxxxx>");
> > +MODULE_LICENSE("GPL");
> > +No empty line at end, please
>
>
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
