I am running MLD linux 5.0 on a raspberry pi 2. The "made in China" case has a built-in lirc receiver on pin 26, so you need to give lirc_rpi an option:
/etc/modprobe.d/custom.conf: options lirc_rpi gpio_in_pin=26
Unfortunately, the lirc_rpi module thinks pin 26 is not a valid gpio pin. From the source:
int valid_gpio_pins[] = { 0, 1, 4, 8, 7, 9, 10, 11, 14, 15, 17, 18, 21, 22, 23, 24, 25 };
The easiest solution is taking a hex editor and edit /lib/modules/3.19.3.177/kernel/drivers/char/lirc_rpi.ko. Search for 0000001800000019 hex and change it to 000000180000001A hex. This adds the value '26' to the valid_gpio_pins[] array in lirc_rpi.c.
Reboot and you get:
[ 27.998198] lirc_rpi: driver registered!
[ 28.957066] lirc_rpi: auto-detected active low receiver on GPIO pin 26
[ 29.528068] input: lircd as /devices/virtual/input/input0
I include the modified lirc_rpi.ko for mld linux 5.0.
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