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| 1 | from glob import glob | |
| 2 | from pathlib import Path | |
| 3 | import errno | |
| 4 | ||
| 5 | def pinmux_path( name ): | |
| 6 | paths = glob( '/sys/bus/platform/drivers/bone-pinmux-helper/*%s*/state' % name ) | |
| 7 | if len(paths) == 0: | |
| 8 | raise KeyError( 'Pinmux node not found: ' + name ) | |
| 9 | if len(paths) > 1: | |
| 10 | raise KeyError( 'Pinmux node ambiguous: ' + name ) | |
| 11 | return Path( paths[0] ) | |
| 12 | ||
| 13 | def get_pinmux_state( name ): | |
| 14 | return pinmux_path( name ).read_text().rstrip() | |
| 15 | ||
| 16 | def set_pinmux_state( name, state ): | |
| 17 | try: | |
| 18 | pinmux_path( name ).write_text( state ) | |
| 19 | except OSError as err: | |
| 20 | if err.errno == errno.ENODEV: | |
| 21 | raise ValueError( 'Invalid state for ' + name + ': ' + state ) from None | |
| 22 | else: | |
| 23 | raise |
