can: sja1000: Add support for CAN_CTRLMODE_LOOPBACK
This adds support for hardware loopback in SJA1000 by utilising its self reception request (SRR) feature. Upon SRR the message is transmitted and received simultaneously, meaning you can't have hardware loopback without actually sending a message to the CAN bus in case of SJA1000. Signed-off-by: NNikita Edward Baruzdin <nebaruzdin@gmail.com> Acked-by: NOliver Hartkopp <socketcan@hartkopp.net> Signed-off-by: NMarc Kleine-Budde <mkl@pengutronix.de>
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