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/*
* sandbox barebox libftdi1 support
*
* Copyright (C) 2016, 2017 Antony Pavlov <antonynpavlov@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.
*
*/
#include <stdio.h>
#include <ftdi.h>
#define GPIOF_DIR_OUT (0 << 0)
#define GPIOF_DIR_IN (1 << 0)
#define BIT(nr) (1UL << (nr))
struct ft2232_bitbang {
struct ftdi_context *ftdi;
uint8_t odata;
uint8_t dir;
};
static struct ft2232_bitbang ftbb;
static inline int ftdi_flush(struct ftdi_context *ftdi)
{
uint8_t buf[1];
int ret;
buf[0] = SEND_IMMEDIATE;
ret = ftdi_write_data(ftdi, buf, 1);
return ret;
}
static int ftdi_get_high_byte_data(struct ftdi_context *ftdi, uint8_t *data)
{
uint8_t obuf;
int ret;
obuf = GET_BITS_HIGH;
ret = ftdi_write_data(ftdi, &obuf, 1);
ret = ftdi_read_data(ftdi, data, 1);
return ret;
}
static int ftdi_set_high_byte_data_dir(struct ft2232_bitbang *ftbb)
{
uint8_t buf[3];
int ret;
buf[0] = SET_BITS_HIGH;
buf[1] = ftbb->odata;
buf[2] = ftbb->dir;
ret = ftdi_write_data(ftbb->ftdi, buf, 3);
ftdi_flush(ftbb->ftdi);
return ret;
}
int barebox_libftdi1_update(struct ft2232_bitbang *ftbb)
{
return ftdi_set_high_byte_data_dir(ftbb);
}
void barebox_libftdi1_gpio_direction(struct ft2232_bitbang *ftbb,
unsigned off, unsigned dir)
{
switch (dir) {
case GPIOF_DIR_IN:
ftbb->dir &= ~BIT(off);
break;
case GPIOF_DIR_OUT:
ftbb->dir |= BIT(off);
break;
default:
printf("%s:%d: invalid dir argument\n", __FILE__, __LINE__);
}
}
int barebox_libftdi1_gpio_get_value(struct ft2232_bitbang *ftbb, unsigned off)
{
uint8_t data;
ftdi_get_high_byte_data(ftbb->ftdi, &data);
return !!(data & BIT(off));
}
void barebox_libftdi1_gpio_set_value(struct ft2232_bitbang *ftbb,
unsigned off, unsigned val)
{
if (val)
ftbb->odata |= BIT(off);
else
ftbb->odata &= ~BIT(off);
}
struct ft2232_bitbang *barebox_libftdi1_open(int id_vendor, int id_product,
const char *serial)
{
struct ftdi_context *ftdi;
int ret;
ftdi = ftdi_new();
if (!ftdi) {
fprintf(stderr, "ftdi_new failed\n");
goto error;
}
ret = ftdi_usb_open_desc(ftdi, id_vendor, id_product, NULL, serial);
if (ret < 0 && ret != -5) {
fprintf(stderr, "unable to open ftdi device: %d (%s)\n",
ret, ftdi_get_error_string(ftdi));
goto error;
}
ftdi_set_interface(ftdi, INTERFACE_A);
ftdi_set_bitmode(ftdi, 0x00, BITMODE_MPSSE);
ftbb.ftdi = ftdi;
/* reset pins to default neutral state */
ftbb.dir = 0;
ftbb.odata = 0;
ftdi_set_high_byte_data_dir(&ftbb);
return &ftbb;
error:
return NULL;
}
void barebox_libftdi1_close(void)
{
struct ftdi_context *ftdi = ftbb.ftdi;
ftdi_set_interface(ftdi, INTERFACE_ANY);
ftdi_usb_close(ftdi);
ftdi_free(ftdi);
}
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