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atsha204-i2c.h
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atsha204-i2c.h
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/* -*- mode: c; c-file-style: "linux" -*- */
/*
* I2C Driver for Atmel ATSHA204 over I2C
*
* Copyright (C) 2014 Josh Datko, Cryptotronix, [email protected]
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#ifndef _ATSHA204_I2C_H_
#define _ATSHA204_I2C_H_
#include <linux/miscdevice.h>
#include <linux/i2c.h>
#include <linux/device.h>
#include <linux/hw_random.h>
#include <linux/mutex.h>
#define ATSHA204_I2C_VERSION "0.1"
#define ATSHA204_SLEEP 0x01
#define ATSHA204_RNG_NAME "atsha-rng"
struct atsha204_chip {
struct device *dev;
int dev_num;
char devname[7];
unsigned long is_open;
struct i2c_client *client;
struct miscdevice miscdev;
struct mutex transaction_mutex;
};
struct atsha204_cmd_metadata {
int expected_rec_len;
int actual_rec_len;
unsigned long usleep;
};
struct atsha204_buffer {
u8 *ptr;
int len;
};
struct atsha204_file_priv {
struct atsha204_chip *chip;
struct atsha204_cmd_metadata meta;
struct atsha204_buffer buf;
};
static const struct i2c_device_id atsha204_i2c_id[] = {
{"atsha204-i2c", 0},
{ }
};
/* I2C detection */
int atsha204_i2c_probe(struct i2c_client *client,
const struct i2c_device_id *id);
int atsha204_i2c_remove(struct i2c_client *client);
/* Device registration */
struct atsha204_chip *atsha204_i2c_register_hardware(struct device *dev,
struct i2c_client *client);
int atsha204_i2c_add_device(struct atsha204_chip *chip);
void atsha204_i2c_del_device(struct atsha204_chip *chip);
int atsha204_i2c_release(struct inode *inode, struct file *filep);
int atsha204_i2c_open(struct inode *inode, struct file *filep);
/* atsha204 crc functions */
u16 atsha204_crc16(const u8 *buf, const u8 len);
bool atsha204_check_rsp_crc16(const u8 *buf, const u8 len);
int atsha204_i2c_validate_rsp(const struct atsha204_buffer *packet,
struct atsha204_buffer *rsp);
void atsha204_i2c_crc_command(u8 *cmd, int len);
/* sysfs functions */
int atsha204_sysfs_add_device(struct atsha204_chip *chip);
void atsha204_sysfs_del_device(struct atsha204_chip *chip);
/* atsha204 specific functions */
int atsha204_i2c_wakeup(const struct i2c_client *client);
int atsha204_i2c_idle(const struct i2c_client *client);
int atsha204_i2c_transmit(const struct i2c_client *client,
const char __user *buf, size_t len);
int atsha204_i2c_transaction(struct atsha204_chip *chip,
const u8* to_send, size_t to_send_len,
struct atsha204_buffer *buf);
int atsha204_i2c_get_random(u8 *to_fill, const size_t max);
void atsha204_set_params(struct atsha204_cmd_metadata *cmd,
int expected_rec_len,
unsigned long usleep)
{
cmd->expected_rec_len = expected_rec_len;
cmd->usleep = usleep;
}
static int atsha204_i2c_rng_read(struct hwrng *rng, void *data,
size_t max, bool wait)
{
return atsha204_i2c_get_random(data, max);
}
static struct hwrng atsha204_i2c_rng = {
.name = ATSHA204_RNG_NAME,
.read = atsha204_i2c_rng_read,
};
/* Validation functions */
int validate_write_size(const size_t count);
#endif /* _ATSHA204_I2C_H_ */