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/*
* Copyright © 2008 Keith Packard <keithp@keithp.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.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*/
/*
* libusb interface to the GPIO pins on a CP2103.
*
* Various magic constants came from the cp210x driver published by silabs.
*/
#include "cp-usb.h"
#include <stdio.h>
#include <errno.h>
#include <libusb.h>
struct cp_usb {
usb_dev_handle *usb_dev;
uint8_t gpio;
};
#define CP2101_UART 0x00
#define UART_ENABLE 0x0001
#define UART_DISABLE 0x0000
#define REQTYPE_HOST_TO_DEVICE 0x41
#define REQTYPE_DEVICE_TO_HOST 0xc1
static int
cp_usb_gpio_get(struct cp_usb *cp, uint8_t *gpio_get)
{
return usb_control_msg(cp->usb_dev, /* dev */
0xc0, /* request */
0xff, /* requesttype */
0x00c2, /* value */
0, /* index */
(char *) gpio_get, /* bytes */
1, /* size */
300); /* timeout */
}
static int
cp_usb_gpio_set(struct cp_usb *cp, uint8_t mask, uint8_t value)
{
uint16_t gpio_set = ((uint16_t) value << 8) | mask;
return usb_control_msg(cp->usb_dev, /* dev */
0x40, /* request */
0xff, /* requesttype */
0x37e1, /* value */
gpio_set, /* index */
NULL, /* bytes */
0, /* size */
300); /* timeout */
}
static int
cp_usb_uart_enable_disable(struct cp_usb *cp, uint16_t enable)
{
return usb_control_msg(cp->usb_dev,
CP2101_UART,
REQTYPE_HOST_TO_DEVICE,
enable,
0,
NULL,
0,
300);
}
struct cp_usb *
cp_usb_open(void)
{
struct cp_usb *cp;
usb_dev_handle *dev_handle;
struct usb_device *dev = NULL;
struct usb_bus *bus, *busses;
int interface;
int ret;
uint8_t gpio;
usb_init();
usb_find_busses();
usb_find_devices();
busses = usb_get_busses();
for (bus = busses; bus; bus = bus->next) {
for (dev = bus->devices; dev; dev = dev->next) {
if (dev->descriptor.idVendor == 0x10c4 &&
dev->descriptor.idProduct == 0xea60)
break;
}
if (dev)
break;
}
if (!dev){
perror("No CP2103 found");
return NULL;
}
cp = calloc(sizeof(struct cp_usb), 1);
interface = 0;
dev_handle = usb_open(dev);
usb_detach_kernel_driver_np(dev_handle, interface);
usb_claim_interface(dev_handle, interface);
cp->usb_dev = dev_handle;
ret = cp_usb_uart_enable_disable(cp, UART_DISABLE);
cp->gpio = 0xf;
ret = cp_usb_gpio_set(cp, 0xf, cp->gpio);
ret = cp_usb_gpio_get(cp, &gpio);
return cp;
}
void
cp_usb_close(struct cp_usb *cp)
{
cp_usb_uart_enable_disable(cp, UART_DISABLE);
usb_close(cp->usb_dev);
free(cp);
}
void
cp_usb_write(struct cp_usb *cp, uint8_t mask, uint8_t value)
{
uint8_t new_gpio;
int ret;
new_gpio = (cp->gpio & ~mask) | (value & mask);
if (new_gpio != cp->gpio) {
ret = cp_usb_gpio_set(cp, new_gpio ^ cp->gpio, new_gpio);
if (ret < 0)
perror("gpio_set");
cp->gpio = new_gpio;
}
}
uint8_t
cp_usb_read(struct cp_usb *cp)
{
int ret;
uint8_t gpio;
ret = cp_usb_gpio_get(cp, &gpio);
if (ret < 0)
perror("gpio_get");
return gpio;
}
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