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ab15d248 | 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
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2 | /* |
3 | * cec-pin.h - low-level CEC pin control | |
4 | * | |
5 | * Copyright 2017 Cisco Systems, Inc. and/or its affiliates. All rights reserved. | |
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6 | */ |
7 | ||
8 | #ifndef LINUX_CEC_PIN_H | |
9 | #define LINUX_CEC_PIN_H | |
10 | ||
11 | #include <linux/types.h> | |
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12 | #include <media/cec.h> |
13 | ||
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14 | /** |
15 | * struct cec_pin_ops - low-level CEC pin operations | |
16 | * @read: read the CEC pin. Return true if high, false if low. | |
17 | * @low: drive the CEC pin low. | |
18 | * @high: stop driving the CEC pin. The pull-up will drive the pin | |
19 | * high, unless someone else is driving the pin low. | |
20 | * @enable_irq: optional, enable the interrupt to detect pin voltage changes. | |
21 | * @disable_irq: optional, disable the interrupt. | |
22 | * @free: optional. Free any allocated resources. Called when the | |
23 | * adapter is deleted. | |
24 | * @status: optional, log status information. | |
333ef6bd HV |
25 | * @read_hpd: read the HPD pin. Return true if high, false if low or |
26 | * an error if negative. If NULL or -ENOTTY is returned, | |
27 | * then this is not supported. | |
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28 | * |
29 | * These operations are used by the cec pin framework to manipulate | |
30 | * the CEC pin. | |
31 | */ | |
32 | struct cec_pin_ops { | |
33 | bool (*read)(struct cec_adapter *adap); | |
34 | void (*low)(struct cec_adapter *adap); | |
35 | void (*high)(struct cec_adapter *adap); | |
36 | bool (*enable_irq)(struct cec_adapter *adap); | |
37 | void (*disable_irq)(struct cec_adapter *adap); | |
38 | void (*free)(struct cec_adapter *adap); | |
39 | void (*status)(struct cec_adapter *adap, struct seq_file *file); | |
333ef6bd | 40 | int (*read_hpd)(struct cec_adapter *adap); |
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41 | }; |
42 | ||
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43 | /** |
44 | * cec_pin_changed() - update pin state from interrupt | |
45 | * | |
46 | * @adap: pointer to the cec adapter | |
47 | * @value: when true the pin is high, otherwise it is low | |
48 | * | |
49 | * If changes of the CEC voltage are detected via an interrupt, then | |
50 | * cec_pin_changed is called from the interrupt with the new value. | |
51 | */ | |
52 | void cec_pin_changed(struct cec_adapter *adap, bool value); | |
53 | ||
54 | /** | |
55 | * cec_pin_allocate_adapter() - allocate a pin-based cec adapter | |
56 | * | |
57 | * @pin_ops: low-level pin operations | |
58 | * @priv: will be stored in adap->priv and can be used by the adapter ops. | |
59 | * Use cec_get_drvdata(adap) to get the priv pointer. | |
60 | * @name: the name of the CEC adapter. Note: this name will be copied. | |
61 | * @caps: capabilities of the CEC adapter. This will be ORed with | |
62 | * CEC_CAP_MONITOR_ALL and CEC_CAP_MONITOR_PIN. | |
63 | * | |
64 | * Allocate a cec adapter using the cec pin framework. | |
65 | * | |
66 | * Return: a pointer to the cec adapter or an error pointer | |
67 | */ | |
68 | struct cec_adapter *cec_pin_allocate_adapter(const struct cec_pin_ops *pin_ops, | |
69 | void *priv, const char *name, u32 caps); | |
70 | ||
71 | #endif |