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2a71593da3
SMBus Host-Notify protocol, from the adapter point of view consist of receiving a message from a client, including the client address and some other data. It can be simply handled by creating a new slave device and registering a callback performing the parsing of the message received from the client. This commit introduces two new core functions * i2c_new_slave_host_notify_device * i2c_free_slave_host_notify_device that take care of registration of the new slave device and callback and will call i2c_handle_smbus_host_notify once a Host-Notify event is received. Signed-off-by: Alain Volmat <alain.volmat@st.com> Reviewed-by: Pierre-Yves MORDRET <pierre-yves.mordret@st.com> Signed-off-by: Wolfram Sang <wsa@kernel.org>
61 lines
1.7 KiB
C
61 lines
1.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* i2c-smbus.h - SMBus extensions to the I2C protocol
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*
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* Copyright (C) 2010-2019 Jean Delvare <jdelvare@suse.de>
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*/
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#ifndef _LINUX_I2C_SMBUS_H
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#define _LINUX_I2C_SMBUS_H
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#include <linux/i2c.h>
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#include <linux/spinlock.h>
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#include <linux/workqueue.h>
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/**
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* i2c_smbus_alert_setup - platform data for the smbus_alert i2c client
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* @irq: IRQ number, if the smbus_alert driver should take care of interrupt
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* handling
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*
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* If irq is not specified, the smbus_alert driver doesn't take care of
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* interrupt handling. In that case it is up to the I2C bus driver to either
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* handle the interrupts or to poll for alerts.
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*/
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struct i2c_smbus_alert_setup {
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int irq;
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};
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struct i2c_client *i2c_new_smbus_alert_device(struct i2c_adapter *adapter,
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struct i2c_smbus_alert_setup *setup);
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int i2c_handle_smbus_alert(struct i2c_client *ara);
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#if IS_ENABLED(CONFIG_I2C_SMBUS) && IS_ENABLED(CONFIG_OF)
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int of_i2c_setup_smbus_alert(struct i2c_adapter *adap);
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#else
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static inline int of_i2c_setup_smbus_alert(struct i2c_adapter *adap)
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{
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return 0;
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}
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#endif
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#if IS_ENABLED(CONFIG_I2C_SMBUS) && IS_ENABLED(CONFIG_I2C_SLAVE)
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struct i2c_client *i2c_new_slave_host_notify_device(struct i2c_adapter *adapter);
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void i2c_free_slave_host_notify_device(struct i2c_client *client);
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#else
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static inline struct i2c_client *i2c_new_slave_host_notify_device(struct i2c_adapter *adapter)
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{
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return ERR_PTR(-ENOSYS);
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}
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static inline void i2c_free_slave_host_notify_device(struct i2c_client *client)
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{
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}
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#endif
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#if IS_ENABLED(CONFIG_I2C_SMBUS) && IS_ENABLED(CONFIG_DMI)
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void i2c_register_spd(struct i2c_adapter *adap);
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#else
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static inline void i2c_register_spd(struct i2c_adapter *adap) { }
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#endif
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#endif /* _LINUX_I2C_SMBUS_H */
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