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drivers: USB Blaster II: claim interface before using it 

If not, multiple instances of OOCD can concurrently use it.

Change-Id: I48cc9d90521d1dcc7720c6e8bec74f45972d16f7
Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
Reviewed-on: http://openocd.zylin.com/4589
Tested-by: jenkins
Reviewed-by: Antonio Borneo <borneo.antonio@gmail.com>
Reviewed-by: Tomas Vanek <vanekt@fbl.cz>
This commit is contained in:
Oleksij Rempel 2019-02-12 13:51:54 +01:00 committed by Antonio Borneo
parent eca4f964b4
commit 08c7b904c3
1 changed files with 21 additions and 0 deletions
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21
src/jtag/drivers/usb_blaster/ublast2_access_libusb.c
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@ -133,6 +133,11 @@ static int load_usb_blaster_firmware(struct libusb_device_handle *libusb_dev,
return ERROR_FAIL;
}
if (libusb_claim_interface(libusb_dev, 0)) {
LOG_ERROR("unable to claim interface");
return ERROR_JTAG_INIT_FAILED;
}
ublast2_firmware_image.base_address = 0;
ublast2_firmware_image.base_address_set = false;
@ -184,6 +189,13 @@ static int load_usb_blaster_firmware(struct libusb_device_handle *libusb_dev,
image_close(&ublast2_firmware_image);
/*
* Release claimed interface. Most probably it is already disconnected
* and re-enumerated as new devices after firmware upload, so we do
* not need to care about errors.
*/
libusb_release_interface(libusb_dev, 0);
return ERROR_OK;
}
@ -228,6 +240,12 @@ static int ublast2_libusb_init(struct ublast_lowlevel *low)
}
}
if (libusb_claim_interface(low->libusb_dev, 0)) {
LOG_ERROR("unable to claim interface");
jtag_libusb_close(low->libusb_dev);
return ERROR_JTAG_INIT_FAILED;
}
char buffer[5];
jtag_libusb_control_transfer(low->libusb_dev,
LIBUSB_REQUEST_TYPE_VENDOR |
@ -246,6 +264,9 @@ static int ublast2_libusb_init(struct ublast_lowlevel *low)
static int ublast2_libusb_quit(struct ublast_lowlevel *low)
{
if (libusb_release_interface(low->libusb_dev, 0))
LOG_ERROR("usb release interface failed");
jtag_libusb_close(low->libusb_dev);
return ERROR_OK;
};