Problem adding a new device using an initializer

[Rui Santos <rsantos@xxxxxxxxxxxx>]

Hi all,

I currently own a USB 3G mobile device manufactured under the name ZTE
MF620.
At the same time I also own a Huawei USB E220 device.

On 2.6.24-rc5, the Huawei device uses an initializer to switch the
device from a usb-storage to a multi-port mode, that was previously
being done by a userspace application.
I was trying to do the same with the ZTE device, but I'm getting
frustrated. This same ZTE device has a userspace application that also
switches it to a multi-port mode.
Can anyone tell me what I'm doing wrong ?

This is the userspace program ( includes libusb ):
/* 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[65536], *endptr;
#if 0
    usb_urb *isourb;
    struct timeval isotv;
    char isobuf[32768];
#endif

    sleep(5);

    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);
    }*/

    /* printf("ZTE MF620 USB modem\n"); */
    vendor = 0x19d2;
    product = 0x2000;
    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, 0x0000001, 0x0000000, buf, 0x0000012);
/* printf("1 get descriptor returned %d, bytes: ", ret); */
print_bytes(buf, ret);
/* printf("\n"); */
usleep(4*1000);
ret = usb_get_descriptor(devh, 0x0000002, 0x0000000, buf, 0x0000009);
/* printf("2 get descriptor returned %d, bytes: ", ret); */
print_bytes(buf, ret);
/* printf("\n"); */
usleep(4*1000);
ret = usb_get_descriptor(devh, 0x0000002, 0x0000000, buf, 0x0000020);
/* printf("3 get descriptor returned %d, bytes: ", ret); */
print_bytes(buf, ret);
/* printf("\n"); */
usleep(4*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("4 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("4 set alternate setting returned %d\n", ret); */
usleep(63*1000);
ret = usb_set_altinterface(devh, 0);
/* printf("5 set alternate setting returned %d\n", ret); */
usleep(62*1000);
ret = usb_control_msg(devh, USB_TYPE_CLASS + USB_RECIP_INTERFACE +
USB_ENDPOINT_IN, 0x00000fe, 0x0000000, 0x0000000, buf, 0x0000001, 1000);
/* printf("6 control msg returned %d, bytes: ", ret); */
print_bytes(buf, ret);
/* printf("\n"); */
usleep(4*1000);

/*memcpy(buf,
"\x55\x53\x42\x43\xe8\x48\xef\x81\x00\x00\x00\x00\x00\x00\x06\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00",
0x000001f);
ret = usb_bulk_write(devh, 0x00000004, buf, 0x000001f, 1000);
printf("548 bulk write returned %d, bytes: ", ret);
print_bytes(buf, ret);
printf("\n");
usleep(2*1000);
ret = usb_bulk_read(devh, 0x00000083, buf, 0x000000d, 1000);
printf("549 bulk read returned %d, bytes: ", ret);
print_bytes(buf, ret);
printf("\n");
usleep(3*1000);*/

memcpy(buf,
"\x55\x53\x42\x43\x08\xf0\x10\x82\x00\x00\x00\x00\x00\x00\x0a\x85\x01\x01\x01\x01\x01\x01\x01\x01\x01\x00\x00\x00\x00\x00\x00",
0x000001f);
ret = usb_bulk_write(devh, 0x00000004, buf, 0x000001f, 1000);
/* printf("550 bulk write returned %d, bytes: ", ret); */
print_bytes(buf, ret);
/* printf("\n"); */
usleep(1*1000);
ret = usb_bulk_read(devh, 0x00000083, buf, 0x000000d, 1000);
/* printf("551 bulk read returned %d, bytes: ", ret); */
print_bytes(buf, ret);
/* printf("\n"); */
usleep(2*1000);

usb_resetep(devh, 0x83);

ret = usb_release_interface(devh, 0);
assert(ret == 0);
ret = usb_close(devh);
assert(ret == 0);
return 0;
}

This is the Kernel initializer I'm trying to add at
drivers/usb/storage/initializers.c that is not working:

int usb_stor_zte_mf620_init(struct us_data *us)
{
    int result;

    us->iobuf[0] = 0x1;
    result = usb_stor_control_msg(us, us->send_ctrl_pipe,
                      0xFE,
                      USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_IN,
                      0x0, 0x0, us->iobuf, 0x1, 1000);
    US_DEBUGP("usb_control_msg performing result is %d\n", result);
    msleep(4);
    memcpy(us->iobuf, "\x55\x53\x42\x43\x08\xf0\x10\x82\x00\x00\x00\x00"
                      "\x00\x00\x0a\x85\x01\x01\x01\x01\x01\x01\x01\x01"
                      "\x01\x00\x00\x00\x00\x00\x00", 0x1F);
    usb_stor_bulk_transfer_buf(us, us->send_ctrl_pipe, us->iobuf, 0x1F,
NULL);
    usb_stor_Bulk_reset(us);
    return (result ? 0 : -1);

This is also placed at drivers/usb/storage/unusual_devs.h :

UNUSUAL_DEV( 0x19d2, 0x2000, 0x0000, 0x0000,
        "Qualcomm ZTE MF620",
        "Mass Storage",
        US_SC_DEVICE, US_PR_DEVICE, usb_stor_zte_mf620_init,
        0),


NOTE: In order for userspace application to succeed in changing the ZTE
to multi-port mode, it has to be called before the USB device finishes
to "settle".

Thanks for your help,
Rui Santos


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