def enable_spi():
# FIXME: instead of rebooting, add a reboot_required property to
# Changed/Unchanged and allow chaining these.
#
# e.g.
#
# c = some_operation()
# c = c.chain(another_operation, msg=....)
#
# return c
#
# at any point in time, c.reboot_required can be resolved, either
# in a plan/operation or by the driver ("reboot_if_needed()")
# FIXME: check for /etc/modprobe.d/raspi-blacklist.conf
# mentioned at https://www.raspberrypi.org/documentation/
# hardware/raspberrypi/spi/README.md
with fs.edit('/boot/config.txt', create=False) as boot:
boot.insert_line('dtparam=spi=on')
boot.insert_line('dtoverlay=spi-bcm2835-overlay')
if boot.changed:
linux.enable_module('spi_bcm2835', load=False)
return Changed('Enabled SPI, need to reboot now')
if linux.enable_module('spi_bcm2835').changed:
return Changed('SPI kernel module enabled')
return Unchanged('SPI already enabled')
def enable_hwrng():
c = linux.enable_module('bcm2708_rng').changed
c |= apt.install_packages(['rng-tools']).changed
c |= systemd.enable_unit('rng-tools.service').changed
c |= systemd.start_unit('rng-tools.service').changed
return c