diff options
Diffstat (limited to 'lib/cp-usb.c')
| -rw-r--r-- | lib/cp-usb.c | 70 |
1 files changed, 43 insertions, 27 deletions
diff --git a/lib/cp-usb.c b/lib/cp-usb.c index 61b684a2..6ab9092c 100644 --- a/lib/cp-usb.c +++ b/lib/cp-usb.c @@ -16,8 +16,20 @@ * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. */ -#include "ccdbg.h" -#include <usb.h> +/* + * 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> + +struct cp_usb { + usb_dev_handle *usb_dev; + uint8_t gpio; +}; #define CP2101_UART 0x00 #define UART_ENABLE 0x0001 @@ -26,9 +38,9 @@ #define REQTYPE_DEVICE_TO_HOST 0xc1 static int -cp_usb_gpio_get(struct ccdbg *dbg, uint8_t *gpio_get) +cp_usb_gpio_get(struct cp_usb *cp, uint8_t *gpio_get) { - return usb_control_msg(dbg->usb_dev, /* dev */ + return usb_control_msg(cp->usb_dev, /* dev */ 0xc0, /* request */ 0xff, /* requesttype */ 0x00c2, /* value */ @@ -39,11 +51,11 @@ cp_usb_gpio_get(struct ccdbg *dbg, uint8_t *gpio_get) } static int -cp_usb_gpio_set(struct ccdbg *dbg, uint8_t mask, uint8_t value) +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(dbg->usb_dev, /* dev */ + return usb_control_msg(cp->usb_dev, /* dev */ 0x40, /* request */ 0xff, /* requesttype */ 0x37e1, /* value */ @@ -54,9 +66,9 @@ cp_usb_gpio_set(struct ccdbg *dbg, uint8_t mask, uint8_t value) } static int -cp_usb_uart_enable_disable(struct ccdbg *dbg, uint16_t enable) +cp_usb_uart_enable_disable(struct cp_usb *cp, uint16_t enable) { - return usb_control_msg(dbg->usb_dev, + return usb_control_msg(cp->usb_dev, CP2101_UART, REQTYPE_HOST_TO_DEVICE, enable, @@ -66,9 +78,10 @@ cp_usb_uart_enable_disable(struct ccdbg *dbg, uint16_t enable) 300); } -void -cp_usb_init(struct ccdbg *dbg) +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; @@ -92,49 +105,52 @@ cp_usb_init(struct ccdbg *dbg) } if (!dev){ perror("No CP2103 found"); - exit(1); + 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); - 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); + 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_fini(struct ccdbg *dbg) +cp_usb_close(struct cp_usb *cp) { - cp_usb_uart_enable_disable(dbg, UART_DISABLE); - usb_close(dbg->usb_dev); + cp_usb_uart_enable_disable(cp, UART_DISABLE); + usb_close(cp->usb_dev); + free(cp); } void -cp_usb_write(struct ccdbg *dbg, uint8_t mask, uint8_t value) +cp_usb_write(struct cp_usb *cp, 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); + 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"); - dbg->gpio = new_gpio; + cp->gpio = new_gpio; } } uint8_t -cp_usb_read(struct ccdbg *dbg) +cp_usb_read(struct cp_usb *cp) { int ret; uint8_t gpio; - ret = cp_usb_gpio_get(dbg, &gpio); + ret = cp_usb_gpio_get(cp, &gpio); if (ret < 0) - perror("gpio_set"); + perror("gpio_get"); return gpio; } |