usb/serial/pl2303.c

569  * Returns the nearest supported baud rate that can be set directly without
572 static speed_t pl2303_get_supported_baud_rate(speed_t baud)
583 		if (baud_sup[i] > baud)
588 		baud = baud_sup[i - 1];
589 	else if (i > 0 && (baud_sup[i] - baud) > (baud - baud_sup[i - 1]))
590 		baud = baud_sup[i - 1];
592 		baud = baud_sup[i];
594 	return baud;
598  * NOTE: If unsupported baud rates are set directly, the PL2303 seems to
599  *       use 9600 baud.
602 								speed_t baud)
604 	put_unaligned_le32(baud, buf);
606 	return baud;
610 								speed_t baud)
622 	mantissa = baseline / baud;
624 		mantissa = 1;	/* Avoid dividing by zero if baud > 32*12M. */
642 	/* Calculate and return the exact baud rate. */
643 	baud = (baseline / mantissa) >> (exponent << 1);
645 	return baud;
649 								speed_t baud)
661 	mantissa = baseline / baud;
663 		mantissa = 1;   /* Avoid dividing by zero if baud > 32*12M. */
681 	/* Calculate and return the exact baud rate. */
682 	baud = (baseline / mantissa) >> exponent;
684 	return baud;
694 	speed_t baud;
696 	baud = tty_get_baud_rate(tty);
697 	dev_dbg(&port->dev, "baud requested = %u\n", baud);
698 	if (!baud)
702 		baud = min_t(speed_t, baud, spriv->type->max_baud_rate);
704 	 * Use direct method for supported baud rates, otherwise use divisors.
708 		baud_sup = baud;
710 		baud_sup = pl2303_get_supported_baud_rate(baud);
712 	if (baud == baud_sup)
713 		baud = pl2303_encode_baud_rate_direct(buf, baud);
715 		baud = pl2303_encode_baud_rate_divisor_alt(buf, baud);
717 		baud = pl2303_encode_baud_rate_divisor(buf, baud);
719 	/* Save resulting baud rate */
720 	tty_encode_baud_rate(tty, baud, baud);
721 	dev_dbg(&port->dev, "baud set = %u\n", baud);
819 	/* For reference buf[0]:buf[3] baud rate value */
876 	 * as a previously requested baud rate may differ from the one