def test_finds_a_device(emulated_smbus, tmpdir):
i2c_root = tmpdir.mkdir('sys').mkdir('bus').mkdir('i2c')
i2c_root.mkdir('devices').mkdir('i2c-42')
virtual_bus = LinuxI2c(i2c_root=i2c_root)
discovered = Canary.find_supported_devices(root_bus=virtual_bus)
assert len(discovered) == 1
assert discovered[0]._smbus.name == 'i2c-42'
def test_honors_a_bus_filter(emulated_smbus, tmpdir):
i2c_root = tmpdir.mkdir('sys').mkdir('bus').mkdir('i2c')
devices = i2c_root.mkdir('devices')
devices.mkdir('i2c-0')
devices.mkdir('i2c-1')
virtual_bus = LinuxI2c(i2c_root=i2c_root)
discovered = Canary.find_supported_devices(bus='i2c-1',
root_bus=virtual_bus)
assert len(discovered) == 1
assert discovered[0]._smbus.name == 'i2c-1'
def test_ignores_non_bus_sysfs_entries(emulated_smbus, tmpdir):
i2c_root = tmpdir.mkdir('sys').mkdir('bus').mkdir('i2c')
devices = i2c_root.mkdir('devices')
devices.mkdir('i2c-0')
devices.mkdir('0-0050') # SPD info chip on i2c-0
devices.mkdir('i2c-DELL0829:00') # i2c HID chip from Dell laptop
virtual_bus = LinuxI2c(i2c_root=i2c_root)
discovered = Canary.find_supported_devices(root_bus=virtual_bus)
assert len(discovered) == 1
assert discovered[0]._smbus.name == 'i2c-0'
def test_aborts_if_sysfs_is_missing_devices(emulated_smbus, tmpdir):
empty = tmpdir.mkdir('sys').mkdir('bus').mkdir('i2c')
virtual_bus = LinuxI2c(i2c_root=empty)
discovered = Canary.find_supported_devices(root_bus=virtual_bus)
assert discovered == []
