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

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Date: Sun, 28 Jan 2024 18:33:49 +0100
From: Andreas Kemnade <andreas@...nade.info>
To: marcel@...tmann.org,
	johan.hedberg@...il.com,
	luiz.dentz@...il.com,
	johan@...nel.org,
	jirislaby@...nel.org,
	andreas@...nade.info,
	gregkh@...uxfoundation.org,
	linux-kernel@...r.kernel.org,
	linux-bluetooth@...r.kernel.org,
	Adam Ford <aford173@...il.com>,
	Tony Lindgren <tony@...mide.com>,
	tomi.valkeinen@...asonboard.com,
	Péter Ujfalusi <peter.ujfalusi@...il.com>,
	robh@...nel.org,
	hns@...delico.com
Subject: [RFC PATCH v2 0/3] bluetooth/gnss: GNSS support for TiWi chips

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

-- 
2.39.2