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From 1929780cf2cc997f990085bd878112b28f4175c9 Mon Sep 17 00:00:00 2001
From: Phil Elwell <phil@raspberrypi.org>
Date: Tue, 24 Apr 2018 14:42:27 +0100
Subject: [PATCH] gpiolib: Don't prevent IRQ usage of output GPIOs
Upstream Linux deems using output GPIOs to generate IRQs as a bogus
use case, even though the BCM2835 GPIO controller is capable of doing
so. A number of users would like to make use of this facility, so
disable the checks.
See: https://github.com/raspberrypi/linux/issues/2527
Signed-off-by: Phil Elwell <phil@raspberrypi.org>
---
drivers/gpio/gpiolib.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -53,6 +53,8 @@
#define extra_checks 0
#endif
+#define dont_test_bit(b,d) (0)
+
/* Device and char device-related information */
static DEFINE_IDA(gpio_ida);
static dev_t gpio_devt;
@@ -2662,7 +2664,7 @@ int gpiod_direction_output(struct gpio_d
value = !!value;
/* GPIOs used for IRQs shall not be set as output */
- if (test_bit(FLAG_USED_AS_IRQ, &desc->flags)) {
+ if (dont_test_bit(FLAG_USED_AS_IRQ, &desc->flags)) {
gpiod_err(desc,
"%s: tried to set a GPIO tied to an IRQ as output\n",
__func__);
@@ -3361,7 +3363,7 @@ int gpiochip_lock_as_irq(struct gpio_chi
}
}
- if (test_bit(FLAG_IS_OUT, &desc->flags)) {
+ if (dont_test_bit(FLAG_IS_OUT, &desc->flags)) {
chip_err(chip,
"%s: tried to flag a GPIO set as output for IRQ\n",
__func__);
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