Kernel 5.4.0 Ubuntu: Compilation fails, output here

[makrisj]

make -C /lib/modules/5.4.0-80-generic/build M=/home/me/i2c/busI2C/spi-buspirate modules
make[1]: Entering directory '/usr/src/linux-headers-5.4.0-80-generic'
  CC [M]  /home/me/i2c/busI2C/spi-buspirate/spi-buspirate.o
/home/me/i2c/busI2C/spi-buspirate/spi-buspirate.c: In function ‘__bp_dev_add’:
/home/me/i2c/busI2C/spi-buspirate/spi-buspirate.c:637:42: error: implicit declaration of function ‘SPI_BIT_MASK’; did you mean ‘SPI_BPW_MASK’? [-Werror=implicit-function-declaration]
     bp->spi_master->bits_per_word_mask = SPI_BIT_MASK(8);
                                          ^~~~~~~~~~~~
                                          SPI_BPW_MASK
/home/me/i2c/busI2C/spi-buspirate/spi-buspirate.c: In function ‘bp_ldisc_open’:
/home/me/i2c/busI2C/spi-buspirate/spi-buspirate.c:914:5: error: implicit declaration of function ‘setup_timer’; did you mean ‘setup_irq’? [-Werror=implicit-function-declaration]
     setup_timer(&bp->rx_timer, rx_timeout_callback, (unsigned long)(bp));
     ^~~~~~~~~~~
     setup_irq
cc1: some warnings being treated as errors
scripts/Makefile.build:269: recipe for target '/home/me/i2c/busI2C/spi-buspirate/spi-buspirate.o' failed
make[2]: *** [/home/me/i2c/busI2C/spi-buspirate/spi-buspirate.o] Error 1
Makefile:1762: recipe for target '/home/me/i2c/busI2C/spi-buspirate' failed
make[1]: *** [/home/me/i2c/busI2C/spi-buspirate] Error 2
make[1]: Leaving directory '/usr/src/linux-headers-5.4.0-80-generic'
Makefile:8: recipe for target 'all' failed