-/*
- * 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;
-}