diff options
Diffstat (limited to 'lib/cp-usb.c')
| -rw-r--r-- | lib/cp-usb.c | 140 |
1 files changed, 140 insertions, 0 deletions
diff --git a/lib/cp-usb.c b/lib/cp-usb.c new file mode 100644 index 00000000..61b684a2 --- /dev/null +++ b/lib/cp-usb.c @@ -0,0 +1,140 @@ +/* + * 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 = 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"); + 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; +} |