81 lines
2.8 KiB
C
81 lines
2.8 KiB
C
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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 Jean Delvare <jdelvare@suse.de>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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* MA 02110-1301 USA.
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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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* @alert_edge_triggered: whether the alert interrupt is edge (1) or level (0)
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* triggered
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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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* If irq is specified then it it crucial that alert_edge_triggered is
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* properly set.
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*/
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struct i2c_smbus_alert_setup {
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unsigned int alert_edge_triggered:1;
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int irq;
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};
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struct i2c_client *i2c_setup_smbus_alert(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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/**
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* smbus_host_notify - internal structure used by the Host Notify mechanism.
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* @adapter: the I2C adapter associated with this struct
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* @work: worker used to schedule the IRQ in the slave device
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* @lock: spinlock to check if a notification is already pending
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* @pending: flag set when a notification is pending (any new notification will
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* be rejected if pending is true)
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* @payload: the actual payload of the Host Notify event
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* @addr: the address of the slave device which raised the notification
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*
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* This struct needs to be allocated by i2c_setup_smbus_host_notify() and does
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* not need to be freed. Internally, i2c_setup_smbus_host_notify() uses a
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* managed resource to clean this up when the adapter get released.
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*/
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struct smbus_host_notify {
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struct i2c_adapter *adapter;
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struct work_struct work;
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spinlock_t lock;
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bool pending;
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u16 payload;
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u8 addr;
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};
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struct smbus_host_notify *i2c_setup_smbus_host_notify(struct i2c_adapter *adap);
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int i2c_handle_smbus_host_notify(struct smbus_host_notify *host_notify,
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unsigned short addr, unsigned int data);
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#endif /* _LINUX_I2C_SMBUS_H */
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