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From f06d8bce13972d65888bd7790cf339177357f87a Mon Sep 17 00:00:00 2001
From: Ingo Kresse <ingo.kresse@gmail.com>
Date: Fri, 29 Jul 2016 22:50:21 +0000
Subject: [PATCH] fix auto-sense in lirc_rpi driver
On a Raspberry Pi 2, the lirc_rpi driver might receive spurious
interrupts and change it's low-active / high-active setting.
When this happens, the IR remote control stops working.
This patch disables this auto-detection if the 'sense' parameter
was set in the device tree, making the driver robust to such
spurious interrupts.
---
drivers/staging/media/lirc/lirc_rpi.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
--- a/drivers/staging/media/lirc/lirc_rpi.c
+++ b/drivers/staging/media/lirc/lirc_rpi.c
@@ -79,6 +79,7 @@ static bool invert = 0;
struct gpio_chip *gpiochip;
static int irq_num;
+static int auto_sense = 1;
/* forward declarations */
static long send_pulse(unsigned long length);
@@ -279,7 +280,9 @@ static irqreturn_t irq_handler(int i, vo
* detecting pulse while this
* MUST be a space!
*/
- sense = sense ? 0 : 1;
+ if (auto_sense) {
+ sense = sense ? 0 : 1;
+ }
}
} else {
data = (int) (deltv*1000000 +
@@ -417,6 +420,7 @@ static int init_port(void)
printk(KERN_INFO LIRC_DRIVER_NAME
": manually using active %s receiver on GPIO pin %d\n",
sense ? "low" : "high", gpio_in_pin);
+ auto_sense = 0;
}
return 0;
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