[RFC PATCH v2 0/3] bluetooth/gnss: GNSS support for TiWi chips

Andreas Kemnade
2024-01-28T18:06:19Z

Some of these chips have GNSS support. In some vendor kernels
a driver on top of misc/ti-st can be found providing a /dev/tigps
device which speaks the secretive Air Independent Interface (AI2) protocol.

To be more compatible with userspace send out NMEA by default but
allow a more raw mode by using a module parameter.

This was tested on the Epson Moverio BT-200.

Changes since V1:
- Set up things for NMEA output
- Powerup/down at open()/close()
- split out logic between drivers/bluetooth and drivers/gnss
- leave out drivers/misc/ti-st driver removal to avoid
filling up mailboxes during the iterations, this series is
still a proof that it is not needed, will take the brush after
this series is accepted.

Andreas Kemnade (3):
gnss: Add AI2 protocol used by some TI combo chips.
bluetooth: ti-st: Add GNSS subdevice for TI Wilink chips
gnss: Add driver for AI2 protocol

drivers/bluetooth/hci_ll.c | 81 ++++++
drivers/gnss/Kconfig | 13 +
drivers/gnss/Makefile | 3 +
drivers/gnss/ai2.c | 523 +++++++++++++++++++++++++++++++++++
drivers/gnss/core.c | 1 +
include/linux/gnss.h | 1 +
include/linux/ti_wilink_st.h | 8 +
7 files changed, 630 insertions(+)
create mode 100644 drivers/gnss/ai2.c

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2.39.2