80 lines
2.8 KiB
C
80 lines
2.8 KiB
C
/* 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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