drivers/comedi/drivers.c

169 			if (s->async) {
171 				kfree(s->async);
454 	struct comedi_cmd *cmd = &s->async->cmd;
463 	struct comedi_async *async = s->async;
464 	struct comedi_cmd *cmd = &async->cmd;
469 		if (async->scans_done < cmd->stop_arg)
470 			scans_left = cmd->stop_arg - async->scans_done;
484  * async buffer.
486  * If the async command has a stop_src of %TRIG_COUNT, the @nscans will be
515 	struct comedi_async *async = s->async;
516 	struct comedi_cmd *cmd = &async->cmd;
528 		comedi_bytes_to_samples(s, async->scan_progress);
549 	struct comedi_async *async = s->async;
550 	struct comedi_cmd *cmd = &async->cmd;
555 		async->cur_chan += comedi_bytes_to_samples(s, num_bytes);
556 		async->cur_chan %= cmd->chanlist_len;
559 	async->scan_progress += num_bytes;
560 	if (async->scan_progress >= scan_length) {
561 		unsigned int nscans = async->scan_progress / scan_length;
563 		if (async->scans_done < (UINT_MAX - nscans))
564 			async->scans_done += nscans;
566 			async->scans_done = UINT_MAX;
568 		async->scan_progress %= scan_length;
569 		async->events |= COMEDI_CB_EOS;
593 	unsigned int events = s->async->events;
645 	struct comedi_async *async;
652 			 "async subdevices must support SDF_CMD_READ or SDF_CMD_WRITE\n");
657 			 "async subdevices must have a do_cmdtest() function\n");
662 			 "async subdevices should have a cancel() function\n");
664 	async = kzalloc(sizeof(*async), GFP_KERNEL);
665 	if (!async)
668 	init_waitqueue_head(&async->wait_head);
669 	s->async = async;
671 	async->max_bufsize = comedi_default_buf_maxsize_kb * 1024;
673 	if (buf_size > async->max_bufsize)
674 		buf_size = async->max_bufsize;