include/linux/i2c-smbus.h

   1 /*
   2  * i2c-smbus.h - SMBus extensions to the I2C protocol
   3  *
   4  * Copyright (C) 2010 Jean Delvare <jdelvare@suse.de>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
  19  * MA 02110-1301 USA.
  20  */
  21
  22 #ifndef _LINUX_I2C_SMBUS_H
  23 #define _LINUX_I2C_SMBUS_H
  24
  25 #include <linux/i2c.h>
  26 #include <linux/spinlock.h>
  27 #include <linux/workqueue.h>
  28
  29
  30 /**
  31  * i2c_smbus_alert_setup - platform data for the smbus_alert i2c client
  32  * @alert_edge_triggered: whether the alert interrupt is edge (1) or level (0)
  33  *              triggered
  34  * @irq: IRQ number, if the smbus_alert driver should take care of interrupt
  35  *              handling
  36  *
  37  * If irq is not specified, the smbus_alert driver doesn't take care of
  38  * interrupt handling. In that case it is up to the I2C bus driver to either
  39  * handle the interrupts or to poll for alerts.
  40  *
  41  * If irq is specified then it it crucial that alert_edge_triggered is
  42  * properly set.
  43  */
  44 struct i2c_smbus_alert_setup {
  45         int                     irq;
  46 };
  47
  48 struct i2c_client *i2c_setup_smbus_alert(struct i2c_adapter *adapter,
  49                                          struct i2c_smbus_alert_setup *setup);
  50 int i2c_handle_smbus_alert(struct i2c_client *ara);
  51
  52 #if IS_ENABLED(CONFIG_I2C_SMBUS) && IS_ENABLED(CONFIG_OF)
  53 int of_i2c_setup_smbus_alert(struct i2c_adapter *adap);
  54 #else
  55 static inline int of_i2c_setup_smbus_alert(struct i2c_adapter *adap)
  56 {
  57         return 0;
  58 }
  59 #endif
  60
  61 #endif /* _LINUX_I2C_SMBUS_H */