FreeBSD/Linux Kernel Cross Reference
sys/compat/linuxkpi/common/include/linux/i2c.h

     /*-
      * Copyright (c) 2021 Beckhoff Automation GmbH & Co. KG
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
      * 1. Redistributions of source code must retain the above copyright
      *    notice, this list of conditions and the following disclaimer.
      * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     */
    
    #ifndef _LINUX_I2C_H_
    #define _LINUX_I2C_H_
    
    #include <sys/types.h>
    #include <sys/errno.h>
    #include <sys/systm.h>
    
    #include <linux/device.h>
    
    #define I2C_MAX_ADAPTER_NAME_LENGTH     32
    
    #define I2C_M_RD        0x0001
    #define I2C_M_NOSTART   0x0002
    #define I2C_M_STOP      0x0004
    
    /* No need for us */
    #define I2C_FUNC_I2C                    0
    #define I2C_FUNC_SMBUS_EMUL             0
    #define I2C_FUNC_SMBUS_READ_BLOCK_DATA  0
    #define I2C_FUNC_SMBUS_BLOCK_PROC_CALL  0
    #define I2C_FUNC_10BIT_ADDR             0
    
    #define I2C_CLASS_DDC   0x8
    #define I2C_CLASS_SPD   0x80
    
    struct i2c_adapter {
            struct module *owner;
            unsigned int class;
    
            char name[I2C_MAX_ADAPTER_NAME_LENGTH];
            struct device dev;
    
            const struct i2c_lock_operations *lock_ops;
            const struct i2c_algorithm *algo;
            void *algo_data;
    
            int retries;
            void *data;
    };
    
    struct i2c_msg {
            uint16_t addr;
            uint16_t flags;
            uint16_t len;
            uint8_t *buf;
    };
    
    struct i2c_algorithm {
            int (*master_xfer)(struct i2c_adapter *, struct i2c_msg *, int);
            uint32_t (*functionality)(struct i2c_adapter *);
    };
    
    struct i2c_lock_operations {
            void (*lock_bus)(struct i2c_adapter *, unsigned int);
            int (*trylock_bus)(struct i2c_adapter *, unsigned int);
            void (*unlock_bus)(struct i2c_adapter *, unsigned int);
    };
    
    int lkpi_i2c_add_adapter(struct i2c_adapter *adapter);
    int lkpi_i2c_del_adapter(struct i2c_adapter *adapter);
    
    int lkpi_i2cbb_transfer(struct i2c_adapter *adapter, struct i2c_msg *msgs, int nmsgs);
    
    #define i2c_add_adapter(adapter)        lkpi_i2c_add_adapter(adapter)
    #define i2c_del_adapter(adapter)        lkpi_i2c_del_adapter(adapter)
    
    #define i2c_get_adapter(x)      NULL
    #define i2c_put_adapter(x)
    
    static inline int
    do_i2c_transfer(struct i2c_adapter *adapter, struct i2c_msg *msgs, int nmsgs)
    {
            int ret, retries;
   
           retries = adapter->retries == 0 ? 1 : adapter->retries;
           for (; retries != 0; retries--) {
                   if (adapter->algo != NULL && adapter->algo->master_xfer != NULL)
                           ret = adapter->algo->master_xfer(adapter, msgs, nmsgs);
                   else
                           ret = lkpi_i2cbb_transfer(adapter, msgs, nmsgs);
                   if (ret != -EAGAIN)
                           break;
           }
   
           return (ret);
   }
   
   static inline int
   i2c_transfer(struct i2c_adapter *adapter, struct i2c_msg *msgs, int nmsgs)
   {
           int ret;
   
           if (adapter->algo == NULL && adapter->algo_data == NULL)
                   return (-EOPNOTSUPP);
   
           if (adapter->lock_ops)
                   adapter->lock_ops->lock_bus(adapter, 0);
   
           ret = do_i2c_transfer(adapter, msgs, nmsgs);
   
           if (adapter->lock_ops)
                   adapter->lock_ops->unlock_bus(adapter, 0);
   
           return (ret);
   }
   
   /* Unlocked version of i2c_transfer */
   static inline int
   __i2c_transfer(struct i2c_adapter *adapter, struct i2c_msg *msgs, int nmsgs)
   {
           return (do_i2c_transfer(adapter, msgs, nmsgs));
   }
   
   static inline void
   i2c_set_adapdata(struct i2c_adapter *adapter, void *data)
   {
           adapter->data = data;
   }
   
   static inline void *
   i2c_get_adapdata(struct i2c_adapter *adapter)
   {
           return (adapter->data);
   }
   
   #endif  /* _LINUX_I2C_H_ */

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