1 /* 2 * Copyright (c) 2013-2020 François Tigeot <ftigeot@wolfpond.org> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice unmodified, this list of conditions, and the following 10 * disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 */ 26 27 #ifndef _LINUX_I2C_H_ 28 #define _LINUX_I2C_H_ 29 30 #include <linux/mod_devicetable.h> 31 #include <linux/device.h> /* for struct device */ 32 #include <linux/sched.h> /* for completion */ 33 #include <linux/mutex.h> 34 #include <linux/of.h> /* for struct device_node */ 35 #include <uapi/linux/i2c.h> 36 37 #include <bus/iicbus/iic.h> 38 39 #define I2C_M_RD IIC_M_RD 40 #define I2C_M_NOSTART IIC_M_NOSTART 41 42 struct i2c_lock_operations; 43 44 struct i2c_adapter { 45 const struct i2c_algorithm *algo; 46 void *algo_data; 47 48 int timeout; 49 int retries; 50 struct device dev; 51 void *private_data; 52 53 char name[48]; 54 55 const struct i2c_lock_operations *lock_ops; 56 }; 57 58 struct i2c_client { 59 unsigned short flags; 60 unsigned short addr; 61 char name[I2C_NAME_SIZE]; 62 struct i2c_adapter *adapter; 63 }; 64 65 int __i2c_transfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num); 66 int i2c_transfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num); 67 68 struct i2c_algorithm { 69 int (*master_xfer)(struct i2c_adapter *adap, struct i2c_msg *msgs, 70 int num); 71 72 u32 (*functionality) (struct i2c_adapter *); 73 }; 74 75 extern int i2c_add_adapter(struct i2c_adapter *); 76 extern void i2c_del_adapter(struct i2c_adapter *); 77 78 static inline void 79 i2c_set_adapdata(struct i2c_adapter *dev, void *data) 80 { 81 dev->private_data = data; 82 } 83 84 static inline void * 85 i2c_get_adapdata(const struct i2c_adapter *dev) 86 { 87 return dev->private_data; 88 } 89 90 struct i2c_board_info { 91 char type[I2C_NAME_SIZE]; 92 unsigned short addr; 93 }; 94 95 struct i2c_client * 96 i2c_new_device(struct i2c_adapter *adap, struct i2c_board_info const *info); 97 98 #define I2C_LOCK_SEGMENT BIT(1) 99 100 struct i2c_lock_operations { 101 void (*lock_bus)(struct i2c_adapter *, unsigned int flags); 102 int (*trylock_bus)(struct i2c_adapter *, unsigned int flags); 103 void (*unlock_bus)(struct i2c_adapter *, unsigned int flags); 104 }; 105 106 #endif /* _LINUX_I2C_H_ */ 107