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From: Andy S. <and...@gm...> - 2020-07-27 10:35:18
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On Thu, Jul 16, 2020 at 2:53 AM Mark Pearson <mar...@le...> wrote:
>
> Some Lenovo Thinkpad platforms are equipped with a 'palm sensor' so as
> to be able to determine if a user is physically proximate to the device.
>
> This patch provides the ability to retrieve the psensor state via sysfs
> entrypoints and will be used by userspace for WWAN functionality to
> control the transmission level safely
...
> case TP_HKEY_EV_PALM_DETECTED:
> case TP_HKEY_EV_PALM_UNDETECTED:
> - /* palm detected hovering the keyboard, forward to user-space
> - * via netlink for consumption */
> + /* palm detected - pass on to event handler */
> + tpacpi_driver_event(hkey);
> return true;
Comment here tells something about the netlink interface to user
space. Can you elaborate why we need sysfs now and how it's all
supposed to work?
...
> +static int psensor_get(bool *state)
> +{
> + acpi_handle psensor_handle;
> + int output;
> +
> + if (ACPI_FAILURE(acpi_get_handle(hkey_handle, "GPSS", &psensor_handle)))
> + return -ENODEV;
> +
> + if (!acpi_evalf(psensor_handle, &output, NULL, "d"))
> + return -EIO;
> +
> + /* Check if sensor has a Psensor */
> + if (!(output & BIT(PSENSOR_PRESENT_BIT)))
> + return -ENODEV;
> +
> + /* Return if psensor is set or not */
> + *state = output & BIT(PSENSOR_ON_BIT) ? true : false;
> + return 0;
> +}
It reminds me of a function you created in one of the previous
changes. Can you rather create a parameterized helper which will serve
for both?
...
> +/* sysfs psensor entry */
> +static ssize_t psensor_state_show(struct device *dev,
> + struct device_attribute *attr,
> + char *buf)
> +{
> + return snprintf(buf, PAGE_SIZE, "%d\n", psensor_state);
We know that %d takes much less than PAGE_SIZE, use sprintf().
> +}
> +
No blank line here.
> +static DEVICE_ATTR_RO(psensor_state);
...
> +static struct attribute *psensor_attributes[] = {
> + &dev_attr_psensor_state.attr,
> + NULL,
No comma for terminator line(s).
> +};
...
> + /* If support isn't available (ENODEV) then don't return an error
> + * but just don't create the sysfs group
> + */
/*
* Consider to use a proper multi-line comment style.
* Like here. (It's applicable to the entire patch)
*/
...
> + err = sysfs_create_group(&tpacpi_pdev->dev.kobj, &psensor_attr_group);
> + return err;
return sysfs...
--
With Best Regards,
Andy Shevchenko
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