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platform_system_core/fastboot/usb_linux.c
Mark Wachsler 157b00171a Wait for device to disappear after reboot-bootloader. 
(Linux only for now) With fastboot reading serial numbers from sysfs, it had
become possible for a fastboot command issued immediately after rebooting
the bootloader to fail, because sysfs still thought the device was online.
To prevent this, after reboot-bootloader we wait for the device to disconnect.

Also made usb_read and usb_write fail immediately if the descriptor has been
closed; this prevents an incorrect error message ("Bad file descriptor")
when errors from fb_getvar are ignored (e.g., by fb_format_supported).

Also removed unused fd param from filter_usb_device, and simplified logic
in usb_write by using do/while instead of a special case for len == 0.

Change-Id: I799b857eab411fd8ad25f5777fc61c685152ea86
2013-10-17 20:06:32 +00:00

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/*
* Copyright (C) 2008 The Android Open Source Project
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <dirent.h>
#include <fcntl.h>
#include <errno.h>
#include <pthread.h>
#include <ctype.h>
#include <linux/usbdevice_fs.h>
#include <linux/usbdevice_fs.h>
#include <linux/version.h>
#if LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 20)
#include <linux/usb/ch9.h>
#else
#include <linux/usb_ch9.h>
#endif
#include <asm/byteorder.h>
#include "fastboot.h"
#include "usb.h"
#define MAX_RETRIES 5
/* Timeout in seconds for usb_wait_for_disconnect.
* It doesn't usually take long for a device to disconnect (almost always
* under 2 seconds) but we'll time out after 3 seconds just in case.
*/
#define WAIT_FOR_DISCONNECT_TIMEOUT 3
#ifdef TRACE_USB
#define DBG1(x...) fprintf(stderr, x)
#define DBG(x...) fprintf(stderr, x)
#else
#define DBG(x...)
#define DBG1(x...)
#endif
/* The max bulk size for linux is 16384 which is defined
* in drivers/usb/core/devio.c.
*/
#define MAX_USBFS_BULK_SIZE (16 * 1024)
struct usb_handle
{
char fname[64];
int desc;
unsigned char ep_in;
unsigned char ep_out;
};
/* True if name isn't a valid name for a USB device in /sys/bus/usb/devices.
* Device names are made up of numbers, dots, and dashes, e.g., '7-1.5'.
* We reject interfaces (e.g., '7-1.5:1.0') and host controllers (e.g. 'usb1').
* The name must also start with a digit, to disallow '.' and '..'
*/
static inline int badname(const char *name)
{
if (!isdigit(*name))
return 1;
while(*++name) {
if(!isdigit(*name) && *name != '.' && *name != '-')
return 1;
}
return 0;
}
static int check(void *_desc, int len, unsigned type, int size)
{
unsigned char *desc = _desc;
if(len < size) return -1;
if(desc[0] < size) return -1;
if(desc[0] > len) return -1;
if(desc[1] != type) return -1;
return 0;
}
static int filter_usb_device(char* sysfs_name,
char *ptr, int len, int writable,
ifc_match_func callback,
int *ept_in_id, int *ept_out_id, int *ifc_id)
{
struct usb_device_descriptor *dev;
struct usb_config_descriptor *cfg;
struct usb_interface_descriptor *ifc;
struct usb_endpoint_descriptor *ept;
struct usb_ifc_info info;
int in, out;
unsigned i;
unsigned e;
struct stat st;
int result;
if(check(ptr, len, USB_DT_DEVICE, USB_DT_DEVICE_SIZE))
return -1;
dev = (void*) ptr;
len -= dev->bLength;
ptr += dev->bLength;
if(check(ptr, len, USB_DT_CONFIG, USB_DT_CONFIG_SIZE))
return -1;
cfg = (void*) ptr;
len -= cfg->bLength;
ptr += cfg->bLength;
info.dev_vendor = dev->idVendor;
info.dev_product = dev->idProduct;
info.dev_class = dev->bDeviceClass;
info.dev_subclass = dev->bDeviceSubClass;
info.dev_protocol = dev->bDeviceProtocol;
info.writable = writable;
snprintf(info.device_path, sizeof(info.device_path), "usb:%s", sysfs_name);
/* Read device serial number (if there is one).
* We read the serial number from sysfs, since it's faster and more
* reliable than issuing a control pipe read, and also won't
* cause problems for devices which don't like getting descriptor
* requests while they're in the middle of flashing.
*/
info.serial_number[0] = '\0';
if (dev->iSerialNumber) {
char path[80];
int fd;
snprintf(path, sizeof(path),
"/sys/bus/usb/devices/%s/serial", sysfs_name);
path[sizeof(path) - 1] = '\0';
fd = open(path, O_RDONLY);
if (fd >= 0) {
int chars_read = read(fd, info.serial_number,
sizeof(info.serial_number) - 1);
close(fd);
if (chars_read <= 0)
info.serial_number[0] = '\0';
else if (info.serial_number[chars_read - 1] == '\n') {
// strip trailing newline
info.serial_number[chars_read - 1] = '\0';
}
}
}
for(i = 0; i < cfg->bNumInterfaces; i++) {
if(check(ptr, len, USB_DT_INTERFACE, USB_DT_INTERFACE_SIZE))
return -1;
ifc = (void*) ptr;
len -= ifc->bLength;
ptr += ifc->bLength;
in = -1;
out = -1;
info.ifc_class = ifc->bInterfaceClass;
info.ifc_subclass = ifc->bInterfaceSubClass;
info.ifc_protocol = ifc->bInterfaceProtocol;
for(e = 0; e < ifc->bNumEndpoints; e++) {
if(check(ptr, len, USB_DT_ENDPOINT, USB_DT_ENDPOINT_SIZE))
return -1;
ept = (void*) ptr;
len -= ept->bLength;
ptr += ept->bLength;
if((ept->bmAttributes & 0x03) != 0x02)
continue;
if(ept->bEndpointAddress & 0x80) {
in = ept->bEndpointAddress;
} else {
out = ept->bEndpointAddress;
}
}
info.has_bulk_in = (in != -1);
info.has_bulk_out = (out != -1);
if(callback(&info) == 0) {
*ept_in_id = in;
*ept_out_id = out;
*ifc_id = ifc->bInterfaceNumber;
return 0;
}
}
return -1;
}
static int read_sysfs_string(const char *sysfs_name, const char *sysfs_node,
char* buf, int bufsize)
{
char path[80];
int fd, n;
snprintf(path, sizeof(path),
"/sys/bus/usb/devices/%s/%s", sysfs_name, sysfs_node);
path[sizeof(path) - 1] = '\0';
fd = open(path, O_RDONLY);
if (fd < 0)
return -1;
n = read(fd, buf, bufsize - 1);
close(fd);
if (n < 0)
return -1;
buf[n] = '\0';
return n;
}
static int read_sysfs_number(const char *sysfs_name, const char *sysfs_node)
{
char buf[16];
int value;
if (read_sysfs_string(sysfs_name, sysfs_node, buf, sizeof(buf)) < 0)
return -1;
if (sscanf(buf, "%d", &value) != 1)
return -1;
return value;
}
/* Given the name of a USB device in sysfs, get the name for the same
* device in devfs. Returns 0 for success, -1 for failure.
*/
static int convert_to_devfs_name(const char* sysfs_name,
char* devname, int devname_size)
{
int busnum, devnum;
busnum = read_sysfs_number(sysfs_name, "busnum");
if (busnum < 0)
return -1;
devnum = read_sysfs_number(sysfs_name, "devnum");
if (devnum < 0)
return -1;
snprintf(devname, devname_size, "/dev/bus/usb/%03d/%03d", busnum, devnum);
return 0;
}
static usb_handle *find_usb_device(const char *base, ifc_match_func callback)
{
usb_handle *usb = 0;
char devname[64];
char desc[1024];
int n, in, out, ifc;
DIR *busdir;
struct dirent *de;
int fd;
int writable;
busdir = opendir(base);
if(busdir == 0) return 0;
while((de = readdir(busdir)) && (usb == 0)) {
if(badname(de->d_name)) continue;
if(!convert_to_devfs_name(de->d_name, devname, sizeof(devname))) {
// DBG("[ scanning %s ]\n", devname);
writable = 1;
if((fd = open(devname, O_RDWR)) < 0) {
// Check if we have read-only access, so we can give a helpful
// diagnostic like "adb devices" does.
writable = 0;
if((fd = open(devname, O_RDONLY)) < 0) {
continue;
}
}
n = read(fd, desc, sizeof(desc));
if(filter_usb_device(de->d_name, desc, n, writable, callback,
&in, &out, &ifc) == 0) {
usb = calloc(1, sizeof(usb_handle));
strcpy(usb->fname, devname);
usb->ep_in = in;
usb->ep_out = out;
usb->desc = fd;
n = ioctl(fd, USBDEVFS_CLAIMINTERFACE, &ifc);
if(n != 0) {
close(fd);
free(usb);
usb = 0;
continue;
}
} else {
close(fd);
}
}
}
closedir(busdir);
return usb;
}
int usb_write(usb_handle *h, const void *_data, int len)
{
unsigned char *data = (unsigned char*) _data;
unsigned count = 0;
struct usbdevfs_bulktransfer bulk;
int n;
if(h->ep_out == 0 || h->desc == -1) {
return -1;
}
do {
int xfer;
xfer = (len > MAX_USBFS_BULK_SIZE) ? MAX_USBFS_BULK_SIZE : len;
bulk.ep = h->ep_out;
bulk.len = xfer;
bulk.data = data;
bulk.timeout = 0;
n = ioctl(h->desc, USBDEVFS_BULK, &bulk);
if(n != xfer) {
DBG("ERROR: n = %d, errno = %d (%s)\n",
n, errno, strerror(errno));
return -1;
}
count += xfer;
len -= xfer;
data += xfer;
} while(len > 0);
return count;
}
int usb_read(usb_handle *h, void *_data, int len)
{
unsigned char *data = (unsigned char*) _data;
unsigned count = 0;
struct usbdevfs_bulktransfer bulk;
int n, retry;
if(h->ep_in == 0 || h->desc == -1) {
return -1;
}
while(len > 0) {
int xfer = (len > MAX_USBFS_BULK_SIZE) ? MAX_USBFS_BULK_SIZE : len;
bulk.ep = h->ep_in;
bulk.len = xfer;
bulk.data = data;
bulk.timeout = 0;
retry = 0;
do{
DBG("[ usb read %d fd = %d], fname=%s\n", xfer, h->desc, h->fname);
n = ioctl(h->desc, USBDEVFS_BULK, &bulk);
DBG("[ usb read %d ] = %d, fname=%s, Retry %d \n", xfer, n, h->fname, retry);
if( n < 0 ) {
DBG1("ERROR: n = %d, errno = %d (%s)\n",n, errno, strerror(errno));
if ( ++retry > MAX_RETRIES ) return -1;
sleep( 1 );
}
}
while( n < 0 );
count += n;
len -= n;
data += n;
if(n < xfer) {
break;
}
}
return count;
}
void usb_kick(usb_handle *h)
{
int fd;
fd = h->desc;
h->desc = -1;
if(fd >= 0) {
close(fd);
DBG("[ usb closed %d ]\n", fd);
}
}
int usb_close(usb_handle *h)
{
int fd;
fd = h->desc;
h->desc = -1;
if(fd >= 0) {
close(fd);
DBG("[ usb closed %d ]\n", fd);
}
return 0;
}
usb_handle *usb_open(ifc_match_func callback)
{
return find_usb_device("/sys/bus/usb/devices", callback);
}
/* Wait for the system to notice the device is gone, so that a subsequent
* fastboot command won't try to access the device before it's rebooted.
* Returns 0 for success, -1 for timeout.
*/
int usb_wait_for_disconnect(usb_handle *usb)
{
double deadline = now() + WAIT_FOR_DISCONNECT_TIMEOUT;
while (now() < deadline) {
if (access(usb->fname, F_OK))
return 0;
usleep(50000);
}
return -1;
}
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