You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: i2c_master_slave_driver.rs
    path of file: ./repos/tock/capsules/core/src
    
    the code of the file until where you have to start completion: // Licensed under the Apache License, Version 2.0 or the MIT License.
// SPDX-License-Identifier: Apache-2.0 OR MIT
// Copyright Tock Contributors 2022.

//! Provides both an I2C Master and I2C Slave interface to userspace.
//!
//! By callin
    
    fn command_complete(&self, buffer: &'static mut [u8], status: Result<(), hil::i2c::Error>) {
        // Map I2C error to a number we can pass back to the application
        let status = kernel::errorcode::into_statuscode(match status {
            Ok(()) => Ok(()),
            Err(e) => Err(e.into()),
        });

        // Signal the application layer. Need to copy read in bytes if this
        // was a read call.
        match self.master_action.get() {
            MasterAction::Write => {
                self.master_buffer.replace(buffer);

                self.app.map(|app| {
                    let _ = self.apps.enter(app, |_, kernel_data| {
                        kernel_data.schedule_upcall(0, (0, status, 0)).ok();
                    });
                });
            }

            MasterAction::Read(read_len) => {
                self.app.map(|app| {
                    let _ = self.apps.enter(app, |_, kernel_data| {
                        // Because this (somewhat incorrectly) doesn't report
                        // back how many bytes were read, the result of mut_enter
                        // is ignored. Note that this requires userspace to keep
                        // track of this information, and if read_len is longer
                        // than the buffer could lead to array overrun errors in
                        // userspace. The I2C syscall API should pass back lengths.
                        // -pal 3/5/21
                        kernel_data
                            .get_readwrite_processbuffer(rw_allow::MASTER_RX)
                            .and_then(|master_rx| {
                                master_rx.mut_enter(move |app_buffer| {
                                    let len = cmp::min(app_buffer.len(), read_len as usize);

                                    for (i, c) in buffer[0..len].iter().enumerate() {
                                        app_buffer[i].set(*c);
                                    }

                                    self.master_buffer.replace(buffer);
                                    0
                                })
                            })
                            .unwrap_or(0);
                        kernel_data.schedule_upcall(0, (1, status, 0)).ok();
                    });
                });
            }

            MasterAction::WriteRead(read_len) => {
                self.app.map(|app| {
                    let _ = self.apps.enter(app, |_, kernel_data| {
                        // Because this (somewhat incorrectly) doesn't report
                        // back how many bytes were read, the result of mut_enter
                        // is ignored. Note that this requires userspace to keep
                        // track of this information, and if read_len is longer
                        // than the buffer could lead to array overrun errors in
                        // userspace. The I2C syscall API should pass back lengths.
                        // -pal 3/5/21
                        kernel_data
                            .get_readwrite_processbuffer(rw_allow::MASTER_RX)
                            .and_then(|master_rx| {
                                master_rx.mut_enter(move |app_buffer| {
                                    let len = cmp::min(app_buffer.len(), read_len as usize);
                                    app_buffer[..len].copy_from_slice(&buffer[..len]);
                                    self.master_buffer.replace(buffer);
                                    0
                                })
                            })
                            .unwrap_or(0);
                        kernel_data.schedule_upcall(0, (7, status, 0)).ok();
                    });
                });
            }
        }

        // Check to see if we were listening as an I2C slave and should re-enable
        // that mode.
        if self.listening.get() {
            hil::i2c::I2CSlave::enable(self.i2c);
            hil::i2c::I2CSlave::listen(self.i2c);
        }
    }