gpio-ir-tx-vibr

Linux Kernel module GPIO-IR with multi GPIO management. The new gpio-ir-tx that replace the lirc_rpi is not managing multiple transmitters (via SET_TRANSMITTERS). this proposes version enable the multi gpio with tx_mask.

This has been successfully testing on Rasperry 3B+ & 4B

Note that I am struggling with Raspberry pi zero, where the original and this new version are not working (pulse issue)

How to make it works

Step 1 - first update to the last linux kernel version

apt-get update
apt-get upgrade
rpi-update

Step 2 - Get the Linux Kernel source

cd /home/pi
sudo apt-get install git bc bison flex libssl-dev
sudo wget https://raw.githubusercontent.com/notro/rpi-source/master/rpi-source -O /usr/local/bin/rpi-source && sudo chmod +x /usr/local/bin/rpi-source && /usr/local/bin/rpi-source -q --tag-update
rpi-source

Step 3 - Compile the New driver version

cd gpio-ir-tx
make

Step 4 - Add the overlay in boot file to enable driver at startup

sudo vi /boot/config

and add at the end this line

dtoverlay=gpio-ir-tx-vibr,gpio_pin=13

Note : gpio_pin=13, is not manage since gpio_pin is setup in the dts file

Step 5 - Configuration the gpio pin

Edit the DTS file, the section below is where to put your pin configuration,

vibr-gpios = 	<&gpio 21 0>,
		<&gpio 23 0>,
		<&gpio 24 0>,
		<&gpio 25 0>;

First number is for the pin number, the second is for the state 0 => LOW => Output

Note: The MAX gpio is 8 but feel free to increase the Define MAX_GPIO in the source

Compile and install the DTS

sudo  dtc -@ -I dts -O dtb -o gpio-ir-tx-vibr.dtbo gpio-ir-tx-vibr-overlay.dts
sudo cp gpio-ir-tx-vibr.dtbo /boot/overlays/
sudo reboot

After reboot check the dts is loaded

sudo vcdbg log msg

You should see the log regarding gpio-ir-tx-vibr

Step 6 - Now load the new kernel driver in the kernel

sudo rmmod gpio-ir-tx
sudo insmod gpio-ir-tx

tail -f /var/log/kern

You should see the message of load

then we your lirc configured

Step 7 - Test lirc

Assuming that your lircd is configured correctly, Please not that in version 0.94c the default.c plugin does not enable to manage SET_TRANSMITTER to enable it

change the end of the default.c with

	case  LIRC_SET_TRANSMITTER_MASK:
		return default_ioctl( LIRC_SET_TRANSMITTER_MASK, arg);

	default:
		return DRV_ERR_NOT_IMPLEMENTED;

irsend SET_TRANSMITTERS 1 2 // to send to First transmitter and second
irsend SET_TRANSMITTERS 2 // for the second transmitter

Note there is a bug in the current version, when sending to multiple transmitters there is a lock issue and irsend is not giving back hand, will manage that later.

No issue with 1 transmitter at a time

Enjoy the new module

Step 8 - Optionnal Make the new module permanent after Reboot

uname -r
sudo cp gpio-ir-tx/gpio-ir-tx.ko /lib/modules/[KERNEL Version]/kernel/drivers/media/rc/
sudo update-initramfs -u

vibr77-zz/gpio-ir-tx-vibr