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https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
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4d6d35d341
Some SMBus controllers may restrict writes to addresses where SPD sensors may reside. This may lead to some SPD sensors not functioning correctly, and might need extra handling. Introduce new SPD-instantiating functions that are aware of this, and use them instead. Signed-off-by: Yo-Jung Lin (Leo) <leo.lin@canonical.com> Reviewed-by: Guenter Roeck <linux@roeck-us.net> Link: https://lore.kernel.org/r/20250430-for-upstream-i801-spd5118-no-instantiate-v2-1-2f54d91ae2c7@canonical.com Signed-off-by: Andi Shyti <andi.shyti@kernel.org>
55 lines
1.7 KiB
C
55 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_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_write_disable(struct i2c_adapter *adap);
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void i2c_register_spd_write_enable(struct i2c_adapter *adap);
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#else
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static inline void i2c_register_spd_write_disable(struct i2c_adapter *adap) { }
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static inline void i2c_register_spd_write_enable(struct i2c_adapter *adap) { }
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#endif
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#endif /* _LINUX_I2C_SMBUS_H */
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