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net: rfkill: gpio: set GPIO direction 

commit 23484d817082c3005252d8edfc8292c8a1006b5b upstream.

Fix the undefined usage of the GPIO consumer API after retrieving the
GPIO description with GPIO_ASIS. The API documentation mentions that
GPIO_ASIS won't set a GPIO direction and requires the user to set a
direction before using the GPIO.

This can be confirmed on i.MX6 hardware, where rfkill-gpio is no longer
able to enabled/disable a device, presumably because the GPIO controller
was never configured for the output direction.

Fixes: b2f750c3a8 ("net: rfkill: gpio: prevent value glitch during probe")
Cc: stable@vger.kernel.org
Signed-off-by: Rouven Czerwinski <r.czerwinski@pengutronix.de>
Link: https://msgid.link/20231207075835.3091694-1-r.czerwinski@pengutronix.de
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Rouven Czerwinski 2023-12-07 08:58:36 +01:00 committed by Greg Kroah-Hartman
parent 805611157d
commit e9df9f0891
1 changed files with 8 additions and 0 deletions
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8
net/rfkill/rfkill-gpio.c
View File

@ -116,6 +116,14 @@ static int rfkill_gpio_probe(struct platform_device *pdev)
return -EINVAL;
}
ret = gpiod_direction_output(rfkill->reset_gpio, true);
if (ret)
return ret;
ret = gpiod_direction_output(rfkill->shutdown_gpio, true);
if (ret)
return ret;
rfkill->rfkill_dev = rfkill_alloc(rfkill->name, &pdev->dev,
rfkill->type, &rfkill_gpio_ops,
rfkill);