zircon/system/ulib/ddktl/include/ddktl/i2c-channel.h

// Copyright 2018 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef DDKTL_I2C_CHANNEL_H_
#define DDKTL_I2C_CHANNEL_H_

#include <ddk/protocol/i2c-lib.h>
#include <ddktl/protocol/i2c.h>
#include <zircon/types.h>

namespace ddk {

class I2cChannel : public I2cProtocolClient {
public:
    I2cChannel() {}

    I2cChannel(const i2c_protocol_t* proto)
        : I2cProtocolClient(proto) {}

    I2cChannel(zx_device_t* parent)
        : I2cProtocolClient(parent) {}

    ~I2cChannel() = default;

    // Performs typical i2c Read: writes device register address (1 byte) followed
    // by len reads into buf.
    zx_status_t ReadSync(uint8_t addr, uint8_t* buf, uint8_t len) {
        return WriteReadSync(&addr, 1, buf, len);
    }

    // Writes len bytes from buffer with no trailing read
    zx_status_t WriteSync(const uint8_t* buf, uint8_t len) {
        return WriteReadSync(buf, len, nullptr, 0);
    }

    zx_status_t WriteReadSync(const uint8_t* tx_buf, uint8_t tx_len,
                              uint8_t* rx_buf, uint8_t rx_len) {
        i2c_protocol_t proto;
        GetProto(&proto);
        return i2c_write_read_sync(&proto, tx_buf, tx_len, rx_buf, rx_len);
    }
};

} //namespace ddk

#endif  // DDKTL_I2C_CHANNEL_H_