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/*
stm32flash - Open Source ST STM32 flash program for *nix
Copyright (C) 2014 Antonio Borneo <borneo.antonio@gmail.com>
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include <errno.h>
#include <fcntl.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include "serial.h"
#include "port.h"
#if !defined(__linux__)
static port_err_t i2c_open(struct port_interface *port,
struct port_options *ops)
{
return PORT_ERR_NODEV;
}
struct port_interface port_i2c = {
.name = "i2c",
.open = i2c_open,
};
#else
#ifdef __ANDROID__
#define I2C_SLAVE 0x0703 /* Use this slave address */
#define I2C_FUNCS 0x0705 /* Get the adapter functionality mask */
/* To determine what functionality is present */
#define I2C_FUNC_I2C 0x00000001
#else
#include <linux/i2c.h>
#include <linux/i2c-dev.h>
#endif
#include <sys/ioctl.h>
struct i2c_priv {
int fd;
int addr;
};
static port_err_t i2c_open(struct port_interface *port,
struct port_options *ops)
{
struct i2c_priv *h;
int fd, addr, ret;
unsigned long funcs;
/* 1. check device name match */
if (strncmp(ops->device, "/dev/i2c-", strlen("/dev/i2c-")))
return PORT_ERR_NODEV;
/* 2. check options */
addr = ops->bus_addr;
if (addr < 0x03 || addr > 0x77) {
fprintf(stderr, "I2C address out of range [0x03-0x77]\n");
return PORT_ERR_UNKNOWN;
}
/* 3. open it */
h = calloc(sizeof(*h), 1);
if (h == NULL) {
fprintf(stderr, "End of memory\n");
return PORT_ERR_UNKNOWN;
}
fd = open(ops->device, O_RDWR);
if (fd < 0) {
fprintf(stderr, "Unable to open special file \"%s\"\n",
ops->device);
free(h);
return PORT_ERR_UNKNOWN;
}
/* 3.5. Check capabilities */
ret = ioctl(fd, I2C_FUNCS, &funcs);
if (ret < 0) {
fprintf(stderr, "I2C ioctl(funcs) error %d\n", errno);
close(fd);
free(h);
return PORT_ERR_UNKNOWN;
}
if ((funcs & I2C_FUNC_I2C) == 0) {
fprintf(stderr, "Error: controller is not I2C, only SMBUS.\n");
close(fd);
free(h);
return PORT_ERR_UNKNOWN;
}
/* 4. set options */
ret = ioctl(fd, I2C_SLAVE, addr);
if (ret < 0) {
fprintf(stderr, "I2C ioctl(slave) error %d\n", errno);
close(fd);
free(h);
return PORT_ERR_UNKNOWN;
}
h->fd = fd;
h->addr = addr;
port->private = h;
return PORT_ERR_OK;
}
static port_err_t i2c_close(struct port_interface *port)
{
struct i2c_priv *h;
h = (struct i2c_priv *)port->private;
if (h == NULL)
return PORT_ERR_UNKNOWN;
close(h->fd);
free(h);
port->private = NULL;
return PORT_ERR_OK;
}
static port_err_t i2c_read(struct port_interface *port, void *buf,
size_t nbyte)
{
struct i2c_priv *h;
int ret;
h = (struct i2c_priv *)port->private;
if (h == NULL)
return PORT_ERR_UNKNOWN;
ret = read(h->fd, buf, nbyte);
if (ret != nbyte)
return PORT_ERR_UNKNOWN;
return PORT_ERR_OK;
}
static port_err_t i2c_write(struct port_interface *port, void *buf,
size_t nbyte)
{
struct i2c_priv *h;
int ret;
h = (struct i2c_priv *)port->private;
if (h == NULL)
return PORT_ERR_UNKNOWN;
ret = write(h->fd, buf, nbyte);
if (ret != nbyte)
return PORT_ERR_UNKNOWN;
return PORT_ERR_OK;
}
static port_err_t i2c_gpio(struct port_interface *port, serial_gpio_t n,
int level)
{
return PORT_ERR_OK;
}
static const char *i2c_get_cfg_str(struct port_interface *port)
{
struct i2c_priv *h;
static char str[11];
h = (struct i2c_priv *)port->private;
if (h == NULL)
return "INVALID";
snprintf(str, sizeof(str), "addr 0x%2x", h->addr);
return str;
}
static struct varlen_cmd i2c_cmd_get_reply[] = {
{0x10, 11},
{0x11, 17},
{0x12, 18},
{ /* sentinel */ }
};
struct port_interface port_i2c = {
.name = "i2c",
.flags = PORT_STRETCH_W,
.open = i2c_open,
.close = i2c_close,
.read = i2c_read,
.write = i2c_write,
.gpio = i2c_gpio,
.cmd_get_reply = i2c_cmd_get_reply,
.get_cfg_str = i2c_get_cfg_str,
};
#endif
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