Hi linux-usb, i need someone, who can help me out, translating a libusb based user level program into a linux kernel module. Attached to this mail is this program created with usbsnoop2libusb.pl, which works fine with the device. The module should export the device as /dev/funkey[0..n] and have a read function, which triggers adc on the device and returns the four measured 8-bit adc values. I gave it a try with writing an usb-skeleton.c based module, but it didn't work out so far and I haven't got enough knowledge to debug this kernel module in the right manner. Kind regards and thanks in advance, Jakob
/* This file is generated with usbsnoop2libusb.pl from a usbsnoop log file. */ /* Latest version of the script should be in http://iki.fi/lindi/usb/usbsnoop2libusb.pl */ #include <stdio.h> #include <stdlib.h> #include <string.h> #include <assert.h> #include <signal.h> #include <ctype.h> #include <usb.h> #if 0 #include <linux/usbdevice_fs.h> #define LIBUSB_AUGMENT #include "libusb_augment.h" #endif struct usb_dev_handle *devh; void release_usb_device(int dummy) { int ret; ret = usb_release_interface(devh, 0); if (!ret) printf("failed to release interface: %d\n", ret); usb_close(devh); if (!ret) printf("failed to close interface: %d\n", ret); exit(1); } void list_devices() { struct usb_bus *bus; for (bus = usb_get_busses(); bus; bus = bus->next) { struct usb_device *dev; for (dev = bus->devices; dev; dev = dev->next) printf("0x%04x 0x%04x\n", dev->descriptor.idVendor, dev->descriptor.idProduct); } } struct usb_device *find_device(int vendor, int product) { struct usb_bus *bus; for (bus = usb_get_busses(); bus; bus = bus->next) { struct usb_device *dev; for (dev = bus->devices; dev; dev = dev->next) { if (dev->descriptor.idVendor == vendor && dev->descriptor.idProduct == product) return dev; } } return NULL; } void print_bytes(char *bytes, int len) { int i; if (len > 0) { for (i=0; i<len; i++) { printf("%02x ", (int)((unsigned char)bytes[i])); } printf("\""); for (i=0; i<len; i++) { printf("%c", isprint(bytes[i]) ? bytes[i] : '.'); } printf("\""); } } int main(int argc, char **argv) { int ret, vendor, product; struct usb_device *dev; char buf[65535], *endptr; #if 0 usb_urb *isourb; struct timeval isotv; char isobuf[393216]; #endif usb_init(); usb_set_debug(255); usb_find_busses(); usb_find_devices(); if (argc!=3) { printf("usage: %s vendorID productID\n", argv[0]); printf("ID numbers of currently attached devices:\n"); list_devices(); exit(1); } vendor = strtol(argv[1], &endptr, 16); if (*endptr != '\0') { printf("invalid vendor id\n"); exit(1); } product = strtol(argv[2], &endptr, 16); if (*endptr != '\0') { printf("invalid product id\n"); exit(1); } dev = find_device(vendor, product); assert(dev); devh = usb_open(dev); assert(devh); signal(SIGTERM, release_usb_device); ret = usb_get_driver_np(devh, 0, buf, sizeof(buf)); printf("usb_get_driver_np returned %d\n", ret); if (ret == 0) { printf("interface 0 already claimed by driver \"%s\", attempting to detach it\n", buf); ret = usb_detach_kernel_driver_np(devh, 0); printf("usb_detach_kernel_driver_np returned %d\n", ret); } ret = usb_claim_interface(devh, 0); if (ret != 0) { printf("claim failed with error %d\n", ret); exit(1); } ret = usb_set_altinterface(devh, 0); assert(ret >= 0); ret = usb_get_descriptor(devh, 0x0000002, 0x0000000, buf, 0x0000009); printf("1 get descriptor returned %d, bytes: ", ret); print_bytes(buf, ret); printf("\n"); usleep(6*1000); ret = usb_get_descriptor(devh, 0x0000002, 0x0000000, buf, 0x0000019); printf("2 get descriptor returned %d, bytes: ", ret); print_bytes(buf, ret); printf("\n"); usleep(11*1000); ret = usb_release_interface(devh, 0); if (ret != 0) printf("failed to release interface before set_configuration: %d\n", ret); ret = usb_set_configuration(devh, 0x0000001); printf("3 set configuration returned %d\n", ret); ret = usb_claim_interface(devh, 0); if (ret != 0) printf("claim after set_configuration failed with error %d\n", ret); ret = usb_set_altinterface(devh, 0); printf("3 set alternate setting returned %d\n", ret); usleep(20*1000); ret = usb_get_descriptor(devh, 0x0000001, 0x0000000, buf, 0x0000012); printf("4 get descriptor returned %d, bytes: ", ret); print_bytes(buf, ret); printf("\n"); usleep(10*1000); ret = usb_set_altinterface(devh, 0); printf("5 set alternate setting returned %d\n", ret); usleep(20*1000); ret = usb_set_altinterface(devh, 0); printf("6 set alternate setting returned %d\n", ret); usleep(2500*1000); //trigger adc ret = usb_control_msg(devh, USB_TYPE_CLASS + USB_RECIP_DEVICE + USB_ENDPOINT_IN, 0x0000000, 0x0000000, 0x0000000, buf, 0x0000008, 1000); printf("7 control msg returned %d, bytes: ", ret); print_bytes(buf, ret); printf("\n"); // read four adc values ret = usb_interrupt_read(devh, 0x00000081, buf, 0x0000008, 1000); printf("8 interrupt read returned %d, bytes: ", ret); print_bytes(buf, ret); printf("\n"); // shutdown device ret = usb_control_msg(devh, USB_TYPE_CLASS + USB_RECIP_DEVICE + USB_ENDPOINT_IN, 0x0000002, 0x0000000, 0x0000000, buf, 0x0000008, 1000); printf("12 control msg returned %d, bytes: ", ret); print_bytes(buf, ret); printf("\n"); ret = usb_release_interface(devh, 0); assert(ret == 0); ret = usb_close(devh); assert(ret == 0); return 0; }
