2016-12-02 10:50:26 +00:00
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From 413e42754e61620eb75e0bd632c697b89ff0ffb9 Mon Sep 17 00:00:00 2001
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2016-09-10 12:54:26 +00:00
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From: Ingo Kresse <ingo.kresse@gmail.com>
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Date: Fri, 29 Jul 2016 22:50:21 +0000
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Subject: [PATCH] fix auto-sense in lirc_rpi driver
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On a Raspberry Pi 2, the lirc_rpi driver might receive spurious
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interrupts and change it's low-active / high-active setting.
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When this happens, the IR remote control stops working.
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This patch disables this auto-detection if the 'sense' parameter
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was set in the device tree, making the driver robust to such
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spurious interrupts.
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---
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drivers/staging/media/lirc/lirc_rpi.c | 6 +++++-
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1 file changed, 5 insertions(+), 1 deletion(-)
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--- a/drivers/staging/media/lirc/lirc_rpi.c
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+++ b/drivers/staging/media/lirc/lirc_rpi.c
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@@ -79,6 +79,7 @@ static bool invert = 0;
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struct gpio_chip *gpiochip;
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static int irq_num;
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+static int auto_sense = 1;
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/* forward declarations */
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static long send_pulse(unsigned long length);
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@@ -279,7 +280,9 @@ static irqreturn_t irq_handler(int i, vo
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* detecting pulse while this
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* MUST be a space!
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*/
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- sense = sense ? 0 : 1;
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+ if (auto_sense) {
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+ sense = sense ? 0 : 1;
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+ }
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}
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} else {
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data = (int) (deltv*1000000 +
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@@ -417,6 +420,7 @@ static int init_port(void)
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printk(KERN_INFO LIRC_DRIVER_NAME
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": manually using active %s receiver on GPIO pin %d\n",
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sense ? "low" : "high", gpio_in_pin);
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+ auto_sense = 0;
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}
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return 0;
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