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qemu/usb-linux.c

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/*
* Linux host USB redirector
*
* Copyright (c) 2005 Fabrice Bellard
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "vl.h"
#if defined(__linux__)
#include <dirent.h>
#include <sys/ioctl.h>
#include <linux/usbdevice_fs.h>
#include <linux/version.h>
/* We redefine it to avoid version problems */
struct usb_ctrltransfer {
uint8_t bRequestType;
uint8_t bRequest;
uint16_t wValue;
uint16_t wIndex;
uint16_t wLength;
uint32_t timeout;
void *data;
};
typedef int USBScanFunc(void *opaque, int bus_num, int addr, int class_id,
int vendor_id, int product_id,
const char *product_name, int speed);
static int usb_host_find_device(int *pbus_num, int *paddr,
const char *devname);
//#define DEBUG
#define USBDEVFS_PATH "/proc/bus/usb"
typedef struct USBHostDevice {
USBDevice dev;
int fd;
} USBHostDevice;
static void usb_host_handle_reset(USBDevice *dev)
{
#if 0
USBHostDevice *s = (USBHostDevice *)dev;
/* USBDEVFS_RESET, but not the first time as it has already be
done by the host OS */
ioctl(s->fd, USBDEVFS_RESET);
#endif
}
static int usb_host_handle_control(USBDevice *dev,
int request,
int value,
int index,
int length,
uint8_t *data)
{
USBHostDevice *s = (USBHostDevice *)dev;
struct usb_ctrltransfer ct;
int ret;
if (request == (DeviceOutRequest | USB_REQ_SET_ADDRESS)) {
/* specific SET_ADDRESS support */
dev->addr = value;
return 0;
} else {
ct.bRequestType = request >> 8;
ct.bRequest = request;
ct.wValue = value;
ct.wIndex = index;
ct.wLength = length;
ct.timeout = 50;
ct.data = data;
ret = ioctl(s->fd, USBDEVFS_CONTROL, &ct);
if (ret < 0) {
switch(errno) {
case ETIMEDOUT:
return USB_RET_NAK;
default:
return USB_RET_STALL;
}
} else {
return ret;
}
}
}
static int usb_host_handle_data(USBDevice *dev, int pid,
uint8_t devep,
uint8_t *data, int len)
{
USBHostDevice *s = (USBHostDevice *)dev;
struct usbdevfs_bulktransfer bt;
int ret;
/* XXX: optimize and handle all data types by looking at the
config descriptor */
if (pid == USB_TOKEN_IN)
devep |= 0x80;
bt.ep = devep;
bt.len = len;
bt.timeout = 50;
bt.data = data;
ret = ioctl(s->fd, USBDEVFS_BULK, &bt);
if (ret < 0) {
switch(errno) {
case ETIMEDOUT:
return USB_RET_NAK;
case EPIPE:
default:
#ifdef DEBUG
printf("handle_data: errno=%d\n", errno);
#endif
return USB_RET_STALL;
}
} else {
return ret;
}
}
/* XXX: exclude high speed devices or implement EHCI */
USBDevice *usb_host_device_open(const char *devname)
{
int fd, interface, ret, i;
USBHostDevice *dev;
struct usbdevfs_connectinfo ci;
uint8_t descr[1024];
char buf[1024];
int descr_len, dev_descr_len, config_descr_len, nb_interfaces;
int bus_num, addr;
if (usb_host_find_device(&bus_num, &addr, devname) < 0)
return NULL;
snprintf(buf, sizeof(buf), USBDEVFS_PATH "/%03d/%03d",
bus_num, addr);
fd = open(buf, O_RDWR);
if (fd < 0) {
perror(buf);
return NULL;
}
/* read the config description */
descr_len = read(fd, descr, sizeof(descr));
if (descr_len <= 0) {
perror("read descr");
goto fail;
}
i = 0;
dev_descr_len = descr[0];
if (dev_descr_len > descr_len)
goto fail;
i += dev_descr_len;
config_descr_len = descr[i];
if (i + config_descr_len > descr_len)
goto fail;
nb_interfaces = descr[i + 4];
if (nb_interfaces != 1) {
/* NOTE: currently we grab only one interface */
fprintf(stderr, "usb_host: only one interface supported\n");
goto fail;
}
#ifdef USBDEVFS_DISCONNECT
/* earlier Linux 2.4 do not support that */
{
struct usbdevfs_ioctl ctrl;
ctrl.ioctl_code = USBDEVFS_DISCONNECT;
ctrl.ifno = 0;
ret = ioctl(fd, USBDEVFS_IOCTL, &ctrl);
if (ret < 0 && errno != ENODATA) {
perror("USBDEVFS_DISCONNECT");
goto fail;
}
}
#endif
/* XXX: only grab if all interfaces are free */
interface = 0;
ret = ioctl(fd, USBDEVFS_CLAIMINTERFACE, &interface);
if (ret < 0) {
if (errno == EBUSY) {
fprintf(stderr, "usb_host: device already grabbed\n");
} else {
perror("USBDEVFS_CLAIMINTERFACE");
}
fail:
close(fd);
return NULL;
}
ret = ioctl(fd, USBDEVFS_CONNECTINFO, &ci);
if (ret < 0) {
perror("USBDEVFS_CONNECTINFO");
goto fail;
}
#ifdef DEBUG
printf("host USB device %d.%d grabbed\n", bus_num, addr);
#endif
dev = qemu_mallocz(sizeof(USBHostDevice));
if (!dev)
goto fail;
dev->fd = fd;
if (ci.slow)
dev->dev.speed = USB_SPEED_LOW;
else
dev->dev.speed = USB_SPEED_HIGH;
dev->dev.handle_packet = usb_generic_handle_packet;
dev->dev.handle_reset = usb_host_handle_reset;
dev->dev.handle_control = usb_host_handle_control;
dev->dev.handle_data = usb_host_handle_data;
return (USBDevice *)dev;
}
static int get_tag_value(char *buf, int buf_size,
const char *str, const char *tag,
const char *stopchars)
{
const char *p;
char *q;
p = strstr(str, tag);
if (!p)
return -1;
p += strlen(tag);
while (isspace(*p))
p++;
q = buf;
while (*p != '\0' && !strchr(stopchars, *p)) {
if ((q - buf) < (buf_size - 1))
*q++ = *p;
p++;
}
*q = '\0';
return q - buf;
}
static int usb_host_scan(void *opaque, USBScanFunc *func)
{
FILE *f;
char line[1024];
char buf[1024];
int bus_num, addr, speed, device_count, class_id, product_id, vendor_id;
int ret;
char product_name[512];
f = fopen(USBDEVFS_PATH "/devices", "r");
if (!f) {
term_printf("Could not open %s\n", USBDEVFS_PATH "/devices");
return 0;
}
device_count = 0;
bus_num = addr = speed = class_id = product_id = vendor_id = 0;
ret = 0;
for(;;) {
if (fgets(line, sizeof(line), f) == NULL)
break;
if (strlen(line) > 0)
line[strlen(line) - 1] = '\0';
if (line[0] == 'T' && line[1] == ':') {
if (device_count) {
ret = func(opaque, bus_num, addr, class_id, vendor_id,
product_id, product_name, speed);
if (ret)
goto the_end;
}
if (get_tag_value(buf, sizeof(buf), line, "Bus=", " ") < 0)
goto fail;
bus_num = atoi(buf);
if (get_tag_value(buf, sizeof(buf), line, "Dev#=", " ") < 0)
goto fail;
addr = atoi(buf);
if (get_tag_value(buf, sizeof(buf), line, "Spd=", " ") < 0)
goto fail;
if (!strcmp(buf, "480"))
speed = USB_SPEED_HIGH;
else if (!strcmp(buf, "1.5"))
speed = USB_SPEED_LOW;
else
speed = USB_SPEED_FULL;
product_name[0] = '\0';
class_id = 0xff;
device_count++;
product_id = 0;
vendor_id = 0;
} else if (line[0] == 'P' && line[1] == ':') {
if (get_tag_value(buf, sizeof(buf), line, "Vendor=", " ") < 0)
goto fail;
vendor_id = strtoul(buf, NULL, 16);
if (get_tag_value(buf, sizeof(buf), line, "ProdID=", " ") < 0)
goto fail;
product_id = strtoul(buf, NULL, 16);
} else if (line[0] == 'S' && line[1] == ':') {
if (get_tag_value(buf, sizeof(buf), line, "Product=", "") < 0)
goto fail;
pstrcpy(product_name, sizeof(product_name), buf);
} else if (line[0] == 'D' && line[1] == ':') {
if (get_tag_value(buf, sizeof(buf), line, "Cls=", " (") < 0)
goto fail;
class_id = strtoul(buf, NULL, 16);
}
fail: ;
}
if (device_count) {
ret = func(opaque, bus_num, addr, class_id, vendor_id,
product_id, product_name, speed);
}
the_end:
fclose(f);
return ret;
}
typedef struct FindDeviceState {
int vendor_id;
int product_id;
int bus_num;
int addr;
} FindDeviceState;
static int usb_host_find_device_scan(void *opaque, int bus_num, int addr,
int class_id,
int vendor_id, int product_id,
const char *product_name, int speed)
{
FindDeviceState *s = opaque;
if (vendor_id == s->vendor_id &&
product_id == s->product_id) {
s->bus_num = bus_num;
s->addr = addr;
return 1;
} else {
return 0;
}
}
/* the syntax is :
'bus.addr' (decimal numbers) or
'vendor_id:product_id' (hexa numbers) */
static int usb_host_find_device(int *pbus_num, int *paddr,
const char *devname)
{
const char *p;
int ret;
FindDeviceState fs;
p = strchr(devname, '.');
if (p) {
*pbus_num = strtoul(devname, NULL, 0);
*paddr = strtoul(p + 1, NULL, 0);
return 0;
}
p = strchr(devname, ':');
if (p) {
fs.vendor_id = strtoul(devname, NULL, 16);
fs.product_id = strtoul(p + 1, NULL, 16);
ret = usb_host_scan(&fs, usb_host_find_device_scan);
if (ret) {
*pbus_num = fs.bus_num;
*paddr = fs.addr;
return 0;
}
}
return -1;
}
/**********************/
/* USB host device info */
struct usb_class_info {
int class;
const char *class_name;
};
static const struct usb_class_info usb_class_info[] = {
{ USB_CLASS_AUDIO, "Audio"},
{ USB_CLASS_COMM, "Communication"},
{ USB_CLASS_HID, "HID"},
{ USB_CLASS_HUB, "Hub" },
{ USB_CLASS_PHYSICAL, "Physical" },
{ USB_CLASS_PRINTER, "Printer" },
{ USB_CLASS_MASS_STORAGE, "Storage" },
{ USB_CLASS_CDC_DATA, "Data" },
{ USB_CLASS_APP_SPEC, "Application Specific" },
{ USB_CLASS_VENDOR_SPEC, "Vendor Specific" },
{ USB_CLASS_STILL_IMAGE, "Still Image" },
{ USB_CLASS_CSCID, "Smart Card" },
{ USB_CLASS_CONTENT_SEC, "Content Security" },
{ -1, NULL }
};
static const char *usb_class_str(uint8_t class)
{
const struct usb_class_info *p;
for(p = usb_class_info; p->class != -1; p++) {
if (p->class == class)
break;
}
return p->class_name;
}
void usb_info_device(int bus_num, int addr, int class_id,
int vendor_id, int product_id,
const char *product_name,
int speed)
{
const char *class_str, *speed_str;
switch(speed) {
case USB_SPEED_LOW:
speed_str = "1.5";
break;
case USB_SPEED_FULL:
speed_str = "12";
break;
case USB_SPEED_HIGH:
speed_str = "480";
break;
default:
speed_str = "?";
break;
}
term_printf(" Device %d.%d, speed %s Mb/s\n",
bus_num, addr, speed_str);
class_str = usb_class_str(class_id);
if (class_str)
term_printf(" %s:", class_str);
else
term_printf(" Class %02x:", class_id);
term_printf(" USB device %04x:%04x", vendor_id, product_id);
if (product_name[0] != '\0')
term_printf(", %s", product_name);
term_printf("\n");
}
static int usb_host_info_device(void *opaque, int bus_num, int addr,
int class_id,
int vendor_id, int product_id,
const char *product_name,
int speed)
{
usb_info_device(bus_num, addr, class_id, vendor_id, product_id,
product_name, speed);
return 0;
}
void usb_host_info(void)
{
usb_host_scan(NULL, usb_host_info_device);
}
#else
void usb_host_info(void)
{
term_printf("USB host devices not supported\n");
}
/* XXX: modify configure to compile the right host driver */
USBDevice *usb_host_device_open(const char *devname)
{
return NULL;
}
#endif
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