scd: Support multiple readers by CCID driver.
* scd/apdu.c (new_reader_slot): Lock is now in apdu_dev_list_start. (close_pcsc_reader_direct, close_ccid_reader): RDRNAME is handled... (apdu_close_reader): ... by this function now. (apdu_prepare_exit): Likewise. (open_ccid_reader): Open with dev_list. (apdu_dev_list_start, apdu_dev_list_finish): New. (apdu_open_one_reader): New. (apdu_open_reader): Support multiple readers. * scd/app.c (select_application): With SCAN, opening all readers available, and register as new APP. (app_write_learn_status): app->ref_count == 0 is valid for APP which is not yet used. (app_list_start, app_list_finish): New. * scd/ccid-driver.c (struct ccid_driver_s): Remove RID and BCD_DEVICE. Add BAI. (parse_ccid_descriptor): BCD_DEVICE is now on the arguments. (ccid_dev_scan, ccid_dev_scan_finish): New. (ccid_get_BAI, ccid_compare_BAI, ccid_open_usb_reader): New. (ccid_open_reader): Support multiple readers. (ccid_set_progress_cb, ccid_close_reader): No RID any more.
With this change, multiple readers/tokens are supported by the internal
CCID driver of GnuPG. Until the changes of upper layers (scdaemon,
gpg-agent, and gpg front end), only a single reader is used, though.
- Signed-off-by: NIIBE Yutaka <firstname.lastname@example.org>