| 1 | /* SPDX-License-Identifier: LGPL-2.0+ WITH Linux-syscall-note */ |
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| 2 | /* |
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| 3 | * userio: virtual serio device support |
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| 4 | * Copyright (C) 2015 Red Hat |
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| 5 | * Copyright (C) 2015 Lyude (Stephen Chandler Paul) <cpaul@redhat.com> |
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| 6 | * |
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| 7 | * This program is free software; you can redistribute it and/or modify it |
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| 8 | * under the terms of the GNU Lesser General Public License as published by the |
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| 9 | * Free Software Foundation; either version 2 of the License, or (at your |
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| 10 | * option) any later version. |
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| 11 | * |
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| 12 | * This program is distributed in the hope that it will be useful, but WITHOUT |
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| 13 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS |
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| 14 | * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more |
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| 15 | * details. |
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| 16 | * |
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| 17 | * This is the public header used for user-space communication with the userio |
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| 18 | * driver. __attribute__((__packed__)) is used for all structs to keep ABI |
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| 19 | * compatibility between all architectures. |
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| 20 | */ |
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| 21 | |
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| 22 | #ifndef _USERIO_H |
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| 23 | #define _USERIO_H |
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| 24 | |
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| 25 | #include <linux/types.h> |
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| 26 | |
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| 27 | enum userio_cmd_type { |
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| 28 | USERIO_CMD_REGISTER = 0, |
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| 29 | USERIO_CMD_SET_PORT_TYPE = 1, |
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| 30 | USERIO_CMD_SEND_INTERRUPT = 2 |
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| 31 | }; |
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| 32 | |
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| 33 | /* |
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| 34 | * userio Commands |
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| 35 | * All commands sent to /dev/userio are encoded using this structure. The type |
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| 36 | * field should contain a USERIO_CMD* value that indicates what kind of command |
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| 37 | * is being sent to userio. The data field should contain the accompanying |
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| 38 | * argument for the command, if there is one. |
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| 39 | */ |
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| 40 | struct userio_cmd { |
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| 41 | __u8 type; |
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| 42 | __u8 data; |
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| 43 | } __attribute__((__packed__)); |
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| 44 | |
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| 45 | #endif /* !_USERIO_H */ |
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| 46 | |
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