On Wed, Nov 16, 2016 at 06:38:22PM +0000, Sudeep Holla wrote:
> 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 input keys. It also remove the existing GPIOF_DIR_IN flag setting
> for the legacy gpios and merges into single gpiod_direction_input call.
>
> Fixes: 700a38b27eef ("Input: gpio_keys - switch to using generic device properties")
> Cc: Dmitry Torokhov <dmitry.torokhov@xxxxxxxxx>
> Cc: Linus Walleij <linus.walleij@xxxxxxxxxx>
> Cc: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>
> Cc: Mika Westerberg <mika.westerberg@xxxxxxxxxxxxxxx>
> Signed-off-by: Sudeep Holla <sudeep.holla@xxxxxxx>
> ---
> drivers/input/keyboard/gpio_keys.c | 10 +++++++++-
> drivers/input/keyboard/gpio_keys_polled.c | 10 +++++++++-
> 2 files changed, 18 insertions(+), 2 deletions(-)
>
> v2->v3:
> - Added error handling and error message
>
> diff --git a/drivers/input/keyboard/gpio_keys.c b/drivers/input/keyboard/gpio_keys.c
> index 5576f2ae0b71..ed38a05b3039 100644
> --- a/drivers/input/keyboard/gpio_keys.c
> +++ b/drivers/input/keyboard/gpio_keys.c
> @@ -502,7 +502,7 @@ static int gpio_keys_setup_key(struct platform_device *pdev,
> * Legacy GPIO number, so request the GPIO here and
> * convert it to descriptor.
> */
> - unsigned flags = GPIOF_IN;
> + unsigned flags = 0;
>
> if (button->active_low)
> flags |= GPIOF_ACTIVE_LOW;
Sudeep, I looked into this aa bit deeper, and I have issue with this
part: in absence of GPIOF_IN devm_gpio_request_one() will attempt to
configure GPIO line as output, which may not work. Because of this I
think we should move gpiod_direction_input() call into the "modern"
branch and leave legacy branch as is.
Does the version below work for you?
Thanks!
--
Dmitry
Input: gpio_keys - set input direction explicitly for gpio keys
From: Sudeep Holla <sudeep.holla@xxxxxxx>
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@xxxxxxx>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@xxxxxxxxx>
---
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 5576f2a..582462d 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 72b3503..bed4f20 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
--
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