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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.
*/
#include "ccdbg.h"
#include <usb.h>
#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 ccdbg *dbg, uint8_t *gpio_get)
{
return usb_control_msg(dbg->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 ccdbg *dbg, uint8_t mask, uint8_t value)
{
uint16_t gpio_set = ((uint16_t) value << 8) | mask;
return usb_control_msg(dbg->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 ccdbg *dbg, uint16_t enable)
{
return usb_control_msg(dbg->usb_dev,
CP2101_UART,
REQTYPE_HOST_TO_DEVICE,
enable,
0,
NULL,
0,
300);
}
void
cp_usb_init(struct ccdbg *dbg)
{
usb_dev_handle *dev_handle;
struct usb_device *dev;
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\n");
exit(1);
}
interface = 0;
dev_handle = usb_open(dev);
usb_detach_kernel_driver_np(dev_handle, interface);
usb_claim_interface(dev_handle, interface);
dbg->usb_dev = dev_handle;
ret = cp_usb_uart_enable_disable(dbg, UART_DISABLE);
dbg->gpio = 0xf;
ret = cp_usb_gpio_set(dbg, 0xf, dbg->gpio);
ret = cp_usb_gpio_get(dbg, &gpio);
}
void
cp_usb_fini(struct ccdbg *dbg)
{
cp_usb_uart_enable_disable(dbg, UART_DISABLE);
usb_close(dbg->usb_dev);
}
void
cp_usb_write(struct ccdbg *dbg, uint8_t mask, uint8_t value)
{
uint8_t new_gpio;
int ret;
new_gpio = (dbg->gpio & ~mask) | (value & mask);
if (new_gpio != dbg->gpio) {
ret = cp_usb_gpio_set(dbg, new_gpio ^ dbg->gpio, new_gpio);
if (ret < 0)
perror("gpio_set");
dbg->gpio = new_gpio;
}
}
uint8_t
cp_usb_read(struct ccdbg *dbg)
{
int ret;
uint8_t gpio;
ret = cp_usb_gpio_get(dbg, &gpio);
if (ret < 0)
perror("gpio_set");
return gpio;
}
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