diff options
Diffstat (limited to 'commandline/usb-libusb.c')
| -rw-r--r-- | commandline/usb-libusb.c | 203 |
1 files changed, 203 insertions, 0 deletions
diff --git a/commandline/usb-libusb.c b/commandline/usb-libusb.c new file mode 100644 index 0000000..886da3b --- /dev/null +++ b/commandline/usb-libusb.c @@ -0,0 +1,203 @@ +/* Name: usb-libusb.c + * Project: usbcalls library + * Author: Christian Starkjohann + * Creation Date: 2006-02-02 + * Tabsize: 4 + * Copyright: (c) 2006 by OBJECTIVE DEVELOPMENT Software GmbH + * License: Proprietary, free under certain conditions. See Documentation. + * This Revision: $Id: usb-libusb.c 323 2007-03-29 17:25:03Z cs $ + */ + +/* +General Description: +This module implements USB HID report receiving/sending based on libusb. It +does not read and parse the report descriptor. You must therefore be careful +to pass correctly formatted data blocks of correct size. In order to be +compatible with the Windows implementation, we add a zero report ID for all +reports which don't have an ID. Since we don't parse the descriptor, the caller +must tell us whether report IDs are used or not in usbOpenDevice(). + +The implementation of dummy report IDs is a hack. Whether they are used is +stored in a global variable, not in the device structure (just laziness, don't +want to allocate memory for that). If you open more than one device and the +devices differ in report ID usage, you must change the code. +*/ + +#include <stdio.h> +#include <string.h> +#include <usb.h> + +#define usbDevice usb_dev_handle /* use libusb's device structure */ +#include "usbcalls.h" + +/* ------------------------------------------------------------------------- */ + +#define USBRQ_HID_GET_REPORT 0x01 +#define USBRQ_HID_SET_REPORT 0x09 + +static int usesReportIDs; + +/* ------------------------------------------------------------------------- */ + +static int usbGetStringAscii(usb_dev_handle *dev, int index, int langid, char *buf, int buflen) +{ +char buffer[256]; +int rval, i; + + if((rval = usb_control_msg(dev, USB_ENDPOINT_IN, USB_REQ_GET_DESCRIPTOR, (USB_DT_STRING << 8) + index, langid, buffer, sizeof(buffer), 1000)) < 0) + return rval; + if(buffer[1] != USB_DT_STRING) + return 0; + if((unsigned char)buffer[0] < rval) + rval = (unsigned char)buffer[0]; + rval /= 2; + /* lossy conversion to ISO Latin1 */ + for(i=1;i<rval;i++){ + if(i > buflen) /* destination buffer overflow */ + break; + buf[i-1] = buffer[2 * i]; + if(buffer[2 * i + 1] != 0) /* outside of ISO Latin1 range */ + buf[i-1] = '?'; + } + buf[i-1] = 0; + return i-1; +} + +int usbOpenDevice(usbDevice_t **device, int vendor, char *vendorName, int product, char *productName, int _usesReportIDs) +{ +struct usb_bus *bus; +struct usb_device *dev; +usb_dev_handle *handle = NULL; +int errorCode = USB_ERROR_NOTFOUND; +static int didUsbInit = 0; + + if(!didUsbInit){ + usb_init(); + didUsbInit = 1; + } + usb_find_busses(); + usb_find_devices(); + for(bus=usb_get_busses(); bus; bus=bus->next){ + for(dev=bus->devices; dev; dev=dev->next){ + if(dev->descriptor.idVendor == vendor && dev->descriptor.idProduct == product){ + char string[256]; + int len; + handle = usb_open(dev); /* we need to open the device in order to query strings */ + if(!handle){ + errorCode = USB_ERROR_ACCESS; + fprintf(stderr, "Warning: cannot open USB device: %s\n", usb_strerror()); + continue; + } + if(vendorName == NULL && productName == NULL){ /* name does not matter */ + break; + } + /* now check whether the names match: */ + len = usbGetStringAscii(handle, dev->descriptor.iManufacturer, 0x0409, string, sizeof(string)); + if(len < 0){ + errorCode = USB_ERROR_IO; + fprintf(stderr, "Warning: cannot query manufacturer for device: %s\n", usb_strerror()); + }else{ + errorCode = USB_ERROR_NOTFOUND; + /* fprintf(stderr, "seen device from vendor ->%s<-\n", string); */ + if(strcmp(string, vendorName) == 0){ + len = usbGetStringAscii(handle, dev->descriptor.iProduct, 0x0409, string, sizeof(string)); + if(len < 0){ + errorCode = USB_ERROR_IO; + fprintf(stderr, "Warning: cannot query product for device: %s\n", usb_strerror()); + }else{ + errorCode = USB_ERROR_NOTFOUND; + /* fprintf(stderr, "seen product ->%s<-\n", string); */ + if(strcmp(string, productName) == 0) + break; + } + } + } + usb_close(handle); + handle = NULL; + } + } + if(handle) + break; + } + if(handle != NULL){ + int rval, retries = 3; + if(usb_set_configuration(handle, 1)){ + fprintf(stderr, "Warning: could not set configuration: %s\n", usb_strerror()); + } + /* now try to claim the interface and detach the kernel HID driver on + * linux and other operating systems which support the call. + */ + while((rval = usb_claim_interface(handle, 0)) != 0 && retries-- > 0){ +#ifdef LIBUSB_HAS_DETACH_KERNEL_DRIVER_NP + if(usb_detach_kernel_driver_np(handle, 0) < 0){ + fprintf(stderr, "Warning: could not detach kernel HID driver: %s\n", usb_strerror()); + } +#endif + } +#ifndef __APPLE__ + if(rval != 0) + fprintf(stderr, "Warning: could not claim interface\n"); +#endif +/* Continue anyway, even if we could not claim the interface. Control transfers + * should still work. + */ + errorCode = 0; + *device = handle; + usesReportIDs = _usesReportIDs; + } + return errorCode; +} + +/* ------------------------------------------------------------------------- */ + +void usbCloseDevice(usbDevice_t *device) +{ + if(device != NULL) + usb_close(device); +} + +/* ------------------------------------------------------------------------- */ + +int usbSetReport(usbDevice_t *device, int reportType, char *buffer, int len) +{ +int bytesSent; + + if(!usesReportIDs){ + buffer++; /* skip dummy report ID */ + len--; + } + bytesSent = usb_control_msg(device, USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_ENDPOINT_OUT, USBRQ_HID_SET_REPORT, reportType << 8 | buffer[0], 0, buffer, len, 5000); + if(bytesSent != len){ + if(bytesSent < 0) + fprintf(stderr, "Error sending message: %s\n", usb_strerror()); + return USB_ERROR_IO; + } + return 0; +} + +/* ------------------------------------------------------------------------- */ + +int usbGetReport(usbDevice_t *device, int reportType, int reportNumber, char *buffer, int *len) +{ +int bytesReceived, maxLen = *len; + + if(!usesReportIDs){ + buffer++; /* make room for dummy report ID */ + maxLen--; + } + bytesReceived = usb_control_msg(device, USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_ENDPOINT_IN, USBRQ_HID_GET_REPORT, reportType << 8 | reportNumber, 0, buffer, maxLen, 5000); + if(bytesReceived < 0){ + fprintf(stderr, "Error sending message: %s\n", usb_strerror()); + return USB_ERROR_IO; + } + *len = bytesReceived; + if(!usesReportIDs){ + buffer[-1] = reportNumber; /* add dummy report ID */ + *len++; + } + return 0; +} + +/* ------------------------------------------------------------------------- */ + + |