From dadbb0aa363bf1233f75cab23977add69d197e23 Mon Sep 17 00:00:00 2001
From: Sudeep Holla <sudeep.holla@arm.com>
Date: Wed, 16 Nov 2016 17:01:26 -0800
Subject: [PATCH] Input: gpio_keys - set input direction explicitly
Commit 700a38b27eef ("Input: gpio_keys - switch to using generic device
properties") switched to use generic device properties for GPIO keys and
commit 5feeca3c1e39 ("Input: gpio_keys - add support for GPIO descriptors")
switched from legacy GPIO numbers to GPIO descriptors.
Previously devm_gpio_request_one was explicitly passed GPIOF_DIR_IN flag
to set the GPIO direction as input. However devm_get_gpiod_from_child
doesn't have such provisions and hence fwnode_get_named_gpiod can't set
it as input.
This breaks few platforms with the following error:
" gpiochip_lock_as_irq: tried to flag a GPIO set as output for IRQ
unable to lock HW IRQ <n> for IRQ
genirq: Failed to request resources for POWER (irq <x>) on irqchip
gpio_keys: Unable to claim irq <x>; error -22
gpio-keys: probe failed with error -22 "
This patch fixes the issue by setting input direction explicitly for
gpio lines described by generic properties.
Fixes: 700a38b27eef ("Input: gpio_keys - switch to using generic device properties")
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
---
drivers/input/keyboard/gpio_keys.c | 7 +++++++
drivers/input/keyboard/gpio_keys_polled.c | 8 ++++++++
2 files changed, 15 insertions(+)
diff --git a/drivers/input/keyboard/gpio_keys.c b/drivers/input/keyboard/gpio_keys.c
index 5576f2ae0b71..582462d0af75 100644
--- a/drivers/input/keyboard/gpio_keys.c
+++ b/drivers/input/keyboard/gpio_keys.c
@@ -496,6 +496,13 @@ static int gpio_keys_setup_key(struct platform_device *pdev,
error);
return error;
}
+ } else {
+ error = gpiod_direction_input(bdata->gpiod);
+ if (error) {
+ dev_err(dev, "Failed to configure GPIO %d as input: %d\n",
+ desc_to_gpio(bdata->gpiod), error);
+ return error;
+ }
}
} else if (gpio_is_valid(button->gpio)) {
/*
diff --git a/drivers/input/keyboard/gpio_keys_polled.c b/drivers/input/keyboard/gpio_keys_polled.c
index 72b350315d43..bed4f2086158 100644
--- a/drivers/input/keyboard/gpio_keys_polled.c
+++ b/drivers/input/keyboard/gpio_keys_polled.c
@@ -314,6 +314,14 @@ static int gpio_keys_polled_probe(struct platform_device *pdev)
fwnode_handle_put(child);
return error;
}
+
+ error = gpiod_direction_input(bdata->gpiod);
+ if (error) {
+ dev_err(dev, "Failed to configure GPIO %d as input: %d\n",
+ desc_to_gpio(bdata->gpiod), error);
+ fwnode_handle_put(child);
+ return error;
+ }
} else if (gpio_is_valid(button->gpio)) {
/*
* Legacy GPIO number so request the GPIO here and
--
2.30.2