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gnss: add receiver type support

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Add a "type" device attribute and a "GNSS_TYPE" uevent variable which
can be used to determine the type of a GNSS receiver. The currently
identified types reflect the protocol(s) supported by a receiver:

	"NMEA"	NMEA 0183
	"SiRF"	SiRF Binary
	"UBX"	UBX

Note that both SiRF and UBX type receivers typically support a subset of
NMEA 0183 with vendor extensions (e.g. to allow switching to the vendor
protocol).

Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Johan Hovold
2018-06-01 10:22:59 +02:00
committed by Greg Kroah-Hartman
parent d2efbbd18b
commit 10f146639f
6 changed files with 77 additions and 0 deletions
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9
include/linux/gnss.h
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@@ -18,6 +18,14 @@
struct gnss_device;
enum gnss_type {
GNSS_TYPE_NMEA = 0,
GNSS_TYPE_SIRF,
GNSS_TYPE_UBX,
GNSS_TYPE_COUNT
};
struct gnss_operations {
int (*open)(struct gnss_device *gdev);
void (*close)(struct gnss_device *gdev);
@@ -30,6 +38,7 @@ struct gnss_device {
struct cdev cdev;
int id;
enum gnss_type type;
unsigned long flags;
struct rw_semaphore rwsem;