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79 lines
2.8 KiB
79 lines
2.8 KiB
/* SPDX-License-Identifier: GPL-2.0-only */ |
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/* |
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* cec-pin.h - low-level CEC pin control |
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* |
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* Copyright 2017 Cisco Systems, Inc. and/or its affiliates. All rights reserved. |
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*/ |
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#ifndef LINUX_CEC_PIN_H |
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#define LINUX_CEC_PIN_H |
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#include <linux/types.h> |
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#include <media/cec.h> |
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/** |
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* struct cec_pin_ops - low-level CEC pin operations |
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* @read: read the CEC pin. Returns > 0 if high, 0 if low, or an error |
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* if negative. |
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* @low: drive the CEC pin low. |
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* @high: stop driving the CEC pin. The pull-up will drive the pin |
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* high, unless someone else is driving the pin low. |
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* @enable_irq: optional, enable the interrupt to detect pin voltage changes. |
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* @disable_irq: optional, disable the interrupt. |
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* @free: optional. Free any allocated resources. Called when the |
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* adapter is deleted. |
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* @status: optional, log status information. |
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* @read_hpd: optional. Read the HPD pin. Returns > 0 if high, 0 if low or |
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* an error if negative. |
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* @read_5v: optional. Read the 5V pin. Returns > 0 if high, 0 if low or |
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* an error if negative. |
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* @received: optional. High-level CEC message callback. Allows the driver |
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* to process CEC messages. |
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* |
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* These operations (except for the @received op) are used by the |
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* cec pin framework to manipulate the CEC pin. |
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*/ |
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struct cec_pin_ops { |
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int (*read)(struct cec_adapter *adap); |
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void (*low)(struct cec_adapter *adap); |
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void (*high)(struct cec_adapter *adap); |
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bool (*enable_irq)(struct cec_adapter *adap); |
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void (*disable_irq)(struct cec_adapter *adap); |
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void (*free)(struct cec_adapter *adap); |
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void (*status)(struct cec_adapter *adap, struct seq_file *file); |
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int (*read_hpd)(struct cec_adapter *adap); |
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int (*read_5v)(struct cec_adapter *adap); |
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/* High-level CEC message callback */ |
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int (*received)(struct cec_adapter *adap, struct cec_msg *msg); |
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}; |
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/** |
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* cec_pin_changed() - update pin state from interrupt |
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* |
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* @adap: pointer to the cec adapter |
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* @value: when true the pin is high, otherwise it is low |
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* |
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* If changes of the CEC voltage are detected via an interrupt, then |
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* cec_pin_changed is called from the interrupt with the new value. |
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*/ |
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void cec_pin_changed(struct cec_adapter *adap, bool value); |
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/** |
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* cec_pin_allocate_adapter() - allocate a pin-based cec adapter |
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* |
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* @pin_ops: low-level pin operations |
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* @priv: will be stored in adap->priv and can be used by the adapter ops. |
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* Use cec_get_drvdata(adap) to get the priv pointer. |
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* @name: the name of the CEC adapter. Note: this name will be copied. |
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* @caps: capabilities of the CEC adapter. This will be ORed with |
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* CEC_CAP_MONITOR_ALL and CEC_CAP_MONITOR_PIN. |
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* |
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* Allocate a cec adapter using the cec pin framework. |
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* |
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* Return: a pointer to the cec adapter or an error pointer |
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*/ |
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struct cec_adapter *cec_pin_allocate_adapter(const struct cec_pin_ops *pin_ops, |
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void *priv, const char *name, u32 caps); |
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#endif
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