387 lines
10 KiB
C
387 lines
10 KiB
C
/*
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* Copyright (C) 2008 The Android Open Source Project
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <sys/ioctl.h>
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#include <sys/types.h>
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#include <dirent.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <pthread.h>
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#include <ctype.h>
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#include <linux/usbdevice_fs.h>
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#include <linux/version.h>
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#if LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 20)
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#include <linux/usb/ch9.h>
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#else
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#include <linux/usb_ch9.h>
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#endif
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#include <asm/byteorder.h>
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#include "usb.h"
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#define MAX_RETRIES 5
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#ifdef TRACE_USB
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#define DBG1(x...) fprintf(stderr, x)
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#define DBG(x...) fprintf(stderr, x)
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#else
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#define DBG(x...)
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#define DBG1(x...)
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#endif
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struct usb_handle
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{
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char fname[64];
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int desc;
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unsigned char ep_in;
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unsigned char ep_out;
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};
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static inline int badname(const char *name)
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{
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while(*name) {
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if(!isdigit(*name++)) return 1;
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}
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return 0;
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}
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static int check(void *_desc, int len, unsigned type, int size)
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{
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unsigned char *desc = _desc;
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if(len < size) return -1;
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if(desc[0] < size) return -1;
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if(desc[0] > len) return -1;
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if(desc[1] != type) return -1;
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return 0;
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}
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static int filter_usb_device(int fd, char *ptr, int len, int writable,
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ifc_match_func callback,
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int *ept_in_id, int *ept_out_id, int *ifc_id)
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{
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struct usb_device_descriptor *dev;
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struct usb_config_descriptor *cfg;
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struct usb_interface_descriptor *ifc;
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struct usb_endpoint_descriptor *ept;
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struct usb_ifc_info info;
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int in, out;
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unsigned i;
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unsigned e;
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if(check(ptr, len, USB_DT_DEVICE, USB_DT_DEVICE_SIZE))
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return -1;
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dev = (void*) ptr;
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len -= dev->bLength;
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ptr += dev->bLength;
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if(check(ptr, len, USB_DT_CONFIG, USB_DT_CONFIG_SIZE))
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return -1;
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cfg = (void*) ptr;
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len -= cfg->bLength;
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ptr += cfg->bLength;
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info.dev_vendor = dev->idVendor;
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info.dev_product = dev->idProduct;
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info.dev_class = dev->bDeviceClass;
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info.dev_subclass = dev->bDeviceSubClass;
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info.dev_protocol = dev->bDeviceProtocol;
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info.writable = writable;
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// read device serial number (if there is one)
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info.serial_number[0] = 0;
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if (dev->iSerialNumber) {
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struct usbdevfs_ctrltransfer ctrl;
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__u16 buffer[128];
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int result;
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memset(buffer, 0, sizeof(buffer));
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ctrl.bRequestType = USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_DEVICE;
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ctrl.bRequest = USB_REQ_GET_DESCRIPTOR;
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ctrl.wValue = (USB_DT_STRING << 8) | dev->iSerialNumber;
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ctrl.wIndex = 0;
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ctrl.wLength = sizeof(buffer);
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ctrl.data = buffer;
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ctrl.timeout = 50;
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result = ioctl(fd, USBDEVFS_CONTROL, &ctrl);
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if (result > 0) {
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int i;
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// skip first word, and copy the rest to the serial string, changing shorts to bytes.
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result /= 2;
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for (i = 1; i < result; i++)
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info.serial_number[i - 1] = buffer[i];
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info.serial_number[i - 1] = 0;
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}
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}
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for(i = 0; i < cfg->bNumInterfaces; i++) {
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if(check(ptr, len, USB_DT_INTERFACE, USB_DT_INTERFACE_SIZE))
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return -1;
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ifc = (void*) ptr;
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len -= ifc->bLength;
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ptr += ifc->bLength;
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in = -1;
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out = -1;
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info.ifc_class = ifc->bInterfaceClass;
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info.ifc_subclass = ifc->bInterfaceSubClass;
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info.ifc_protocol = ifc->bInterfaceProtocol;
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for(e = 0; e < ifc->bNumEndpoints; e++) {
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if(check(ptr, len, USB_DT_ENDPOINT, USB_DT_ENDPOINT_SIZE))
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return -1;
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ept = (void*) ptr;
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len -= ept->bLength;
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ptr += ept->bLength;
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if((ept->bmAttributes & 0x03) != 0x02)
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continue;
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if(ept->bEndpointAddress & 0x80) {
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in = ept->bEndpointAddress;
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} else {
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out = ept->bEndpointAddress;
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}
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}
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info.has_bulk_in = (in != -1);
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info.has_bulk_out = (out != -1);
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if(callback(&info) == 0) {
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*ept_in_id = in;
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*ept_out_id = out;
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*ifc_id = ifc->bInterfaceNumber;
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return 0;
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}
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}
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return -1;
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}
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static usb_handle *find_usb_device(const char *base, ifc_match_func callback)
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{
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usb_handle *usb = 0;
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char busname[64], devname[64];
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char desc[1024];
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int n, in, out, ifc;
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DIR *busdir, *devdir;
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struct dirent *de;
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int fd;
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int writable;
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busdir = opendir(base);
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if(busdir == 0) return 0;
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while((de = readdir(busdir)) && (usb == 0)) {
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if(badname(de->d_name)) continue;
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sprintf(busname, "%s/%s", base, de->d_name);
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devdir = opendir(busname);
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if(devdir == 0) continue;
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// DBG("[ scanning %s ]\n", busname);
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while((de = readdir(devdir)) && (usb == 0)) {
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if(badname(de->d_name)) continue;
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sprintf(devname, "%s/%s", busname, de->d_name);
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// DBG("[ scanning %s ]\n", devname);
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writable = 1;
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if((fd = open(devname, O_RDWR)) < 0) {
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// Check if we have read-only access, so we can give a helpful
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// diagnostic like "adb devices" does.
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writable = 0;
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if((fd = open(devname, O_RDONLY)) < 0) {
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continue;
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}
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}
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n = read(fd, desc, sizeof(desc));
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if(filter_usb_device(fd, desc, n, writable, callback,
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&in, &out, &ifc) == 0) {
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usb = calloc(1, sizeof(usb_handle));
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strcpy(usb->fname, devname);
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usb->ep_in = in;
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usb->ep_out = out;
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usb->desc = fd;
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n = ioctl(fd, USBDEVFS_CLAIMINTERFACE, &ifc);
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if(n != 0) {
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close(fd);
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free(usb);
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usb = 0;
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continue;
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}
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} else {
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close(fd);
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}
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}
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closedir(devdir);
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}
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closedir(busdir);
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return usb;
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}
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int usb_write(usb_handle *h, const void *_data, int len)
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{
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unsigned char *data = (unsigned char*) _data;
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unsigned count = 0;
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struct usbdevfs_bulktransfer bulk;
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int n;
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if(h->ep_out == 0) {
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return -1;
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}
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if(len == 0) {
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bulk.ep = h->ep_out;
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bulk.len = 0;
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bulk.data = data;
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bulk.timeout = 0;
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n = ioctl(h->desc, USBDEVFS_BULK, &bulk);
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if(n != 0) {
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fprintf(stderr,"ERROR: n = %d, errno = %d (%s)\n",
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n, errno, strerror(errno));
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return -1;
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}
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return 0;
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}
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while(len > 0) {
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int xfer;
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xfer = (len > 4096) ? 4096 : len;
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bulk.ep = h->ep_out;
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bulk.len = xfer;
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bulk.data = data;
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bulk.timeout = 0;
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n = ioctl(h->desc, USBDEVFS_BULK, &bulk);
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if(n != xfer) {
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DBG("ERROR: n = %d, errno = %d (%s)\n",
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n, errno, strerror(errno));
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return -1;
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}
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count += xfer;
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len -= xfer;
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data += xfer;
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}
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return count;
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}
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int usb_read(usb_handle *h, void *_data, int len)
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{
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unsigned char *data = (unsigned char*) _data;
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unsigned count = 0;
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struct usbdevfs_bulktransfer bulk;
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int n, retry;
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if(h->ep_in == 0) {
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return -1;
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}
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while(len > 0) {
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int xfer = (len > 4096) ? 4096 : len;
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bulk.ep = h->ep_in;
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bulk.len = xfer;
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bulk.data = data;
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bulk.timeout = 0;
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retry = 0;
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do{
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DBG("[ usb read %d fd = %d], fname=%s\n", xfer, h->desc, h->fname);
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n = ioctl(h->desc, USBDEVFS_BULK, &bulk);
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DBG("[ usb read %d ] = %d, fname=%s, Retry %d \n", xfer, n, h->fname, retry);
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if( n < 0 ) {
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DBG1("ERROR: n = %d, errno = %d (%s)\n",n, errno, strerror(errno));
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if ( ++retry > MAX_RETRIES ) return -1;
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sleep( 1 );
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}
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}
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while( n < 0 );
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count += n;
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len -= n;
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data += n;
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if(n < xfer) {
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break;
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}
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}
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return count;
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}
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void usb_kick(usb_handle *h)
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{
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int fd;
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fd = h->desc;
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h->desc = -1;
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if(fd >= 0) {
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close(fd);
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DBG("[ usb closed %d ]\n", fd);
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}
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}
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int usb_close(usb_handle *h)
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{
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int fd;
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fd = h->desc;
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h->desc = -1;
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if(fd >= 0) {
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close(fd);
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DBG("[ usb closed %d ]\n", fd);
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}
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return 0;
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}
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usb_handle *usb_open(ifc_match_func callback)
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{
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return find_usb_device("/dev/bus/usb", callback);
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}
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