-/* read_ctrl_callback
- * USB completion handler for control pipe input
- * called by the USB subsystem in interrupt context
- * parameter:
- * urb USB request block
- * urb->context = inbuf structure for controller state
- */
-static void read_ctrl_callback(struct urb *urb, struct pt_regs *regs)
-{
- struct inbuf_t *inbuf = urb->context;
- struct cardstate *cs = inbuf->cs;
- struct bas_cardstate *ucs = cs->hw.bas;
- int have_data = 0;
- unsigned numbytes;
- int rc;
-
- update_basstate(ucs, 0, BS_ATRDPEND);
-
- if (!ucs->rcvbuf_size) {
- dev_warn(cs->dev, "%s: no receive in progress\n", __func__);
- return;
- }
-
- del_timer(&ucs->timer_cmd_in);
-
- switch (urb->status) {
- case 0: /* normal completion */
- numbytes = urb->actual_length;
- if (unlikely(numbytes != ucs->rcvbuf_size)) {
- dev_warn(cs->dev,
- "control read: received %d chars, expected %d\n",
- numbytes, ucs->rcvbuf_size);
- if (numbytes > ucs->rcvbuf_size)
- numbytes = ucs->rcvbuf_size;
- }
-
- /* copy received bytes to inbuf */
- have_data = gigaset_fill_inbuf(inbuf, ucs->rcvbuf, numbytes);
-
- if (unlikely(numbytes < ucs->rcvbuf_size)) {
- /* incomplete - resubmit for remaining bytes */
- ucs->rcvbuf_size -= numbytes;
- ucs->retry_cmd_in = 0;
- rc = atread_submit(cs, BAS_TIMEOUT);
- if (rc >= 0 || rc == -ENODEV)
- /* resubmitted or disconnected */
- /* - bypass regular exit block */
- return;
- error_reset(cs);
- }
- break;
-
- case -ENOENT: /* cancelled */
- case -ECONNRESET: /* cancelled (async) */
- case -EINPROGRESS: /* pending */
- case -ENODEV: /* device removed */
- case -ESHUTDOWN: /* device shut down */
- /* no action necessary */
- gig_dbg(DEBUG_USBREQ, "%s: %s",
- __func__, get_usb_statmsg(urb->status));
- break;
-
- default: /* severe trouble */
- dev_warn(cs->dev, "control read: %s\n",
- get_usb_statmsg(urb->status));
- if (ucs->retry_cmd_in++ < BAS_RETRY) {
- dev_notice(cs->dev, "control read: retry %d\n",
- ucs->retry_cmd_in);
- rc = atread_submit(cs, BAS_TIMEOUT);
- if (rc >= 0 || rc == -ENODEV)
- /* resubmitted or disconnected */
- /* - bypass regular exit block */
- return;
- } else {
- dev_err(cs->dev,
- "control read: giving up after %d tries\n",
- ucs->retry_cmd_in);
- }
- error_reset(cs);
- }
-
- kfree(ucs->rcvbuf);
- ucs->rcvbuf = NULL;
- ucs->rcvbuf_size = 0;
- if (have_data) {
- gig_dbg(DEBUG_INTR, "%s-->BH", __func__);
- gigaset_schedule_event(cs);
- }
-}
-