On Wed, Oct 25, 2017 at 7:29 AM, Michał Kępień <kernel@xxxxxxxxxx> wrote:
> Radio LED detection method implemented in commit 4f62568c1fcf
> ("fujitsu-laptop: Support radio LED") turned out to be incorrect as it
> causes a radio LED to be erroneously detected on a Fujitsu Lifebook E751
> which has a slide switch (and thus no radio LED). Use bit 17 of
> flags_supported (the value returned by method S000 of ACPI device
> FUJ02E3) to determine whether a radio LED is present as it seems to be a
> more reliable indicator, based on comparing DSDT tables of four Fujitsu
> Lifebook models (E744, E751, S7110, S8420).
>
Pushed to my review and testing queue, thanks!
> Reported-by: Heinrich Siebmanns <harv@xxxxxx>
> Signed-off-by: Michał Kępień <kernel@xxxxxxxxxx>
> ---
> I do not have a Fujitsu laptop with a radio LED for testing, so I was
> only able to check that this patch still does not cause a radio LED to
> be detected on a Lifebook S7020.
>
> Harvey, could you please try this patch on your Lifebook E751 and see
> whether the log messages you reported disappear? I will be happy to
> assist you off-list in case you need help with it.
>
> drivers/platform/x86/fujitsu-laptop.c | 14 +++++++++-----
> 1 file changed, 9 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/platform/x86/fujitsu-laptop.c b/drivers/platform/x86/fujitsu-laptop.c
> index 56a8195096a2..2cfbd3fa5136 100644
> --- a/drivers/platform/x86/fujitsu-laptop.c
> +++ b/drivers/platform/x86/fujitsu-laptop.c
> @@ -691,6 +691,7 @@ static enum led_brightness eco_led_get(struct led_classdev *cdev)
>
> static int acpi_fujitsu_laptop_leds_register(struct acpi_device *device)
> {
> + struct fujitsu_laptop *priv = acpi_driver_data(device);
> struct led_classdev *led;
> int result;
>
> @@ -724,12 +725,15 @@ static int acpi_fujitsu_laptop_leds_register(struct acpi_device *device)
> }
>
> /*
> - * BTNI bit 24 seems to indicate the presence of a radio toggle
> - * button in place of a slide switch, and all such machines appear
> - * to also have an RF LED. Therefore use bit 24 as an indicator
> - * that an RF LED is present.
> + * Some Fujitsu laptops have a radio toggle button in place of a slide
> + * switch and all such machines appear to also have an RF LED. Based on
> + * comparing DSDT tables of four Fujitsu Lifebook models (E744, E751,
> + * S7110, S8420; the first one has a radio toggle button, the other
> + * three have slide switches), bit 17 of flags_supported (the value
> + * returned by method S000 of ACPI device FUJ02E3) seems to indicate
> + * whether given model has a radio toggle button.
> */
> - if (call_fext_func(device, FUNC_BUTTONS, 0x0, 0x0, 0x0) & BIT(24)) {
> + if (priv->flags_supported & BIT(17)) {
> led = devm_kzalloc(&device->dev, sizeof(*led), GFP_KERNEL);
> if (!led)
> return -ENOMEM;
> --
> 2.14.2
>
--
With Best Regards,
Andy Shevchenko
