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Commit 10f14663 authored by Johan Hovold's avatar Johan Hovold Committed by Greg Kroah-Hartman
Browse files

gnss: add receiver type support 



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: default avatarJohan Hovold <johan@kernel.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent d2efbbd1

Documentation/ABI/testing/sysfs-class-gnss

0 → 100644
+15 −0
Original line number Diff line number Diff line 
What:		/sys/class/gnss/gnssN/type

Date:		May 2018

KernelVersion:	4.18

Contact:	Johan Hovold <johan@kernel.org>

Description:

		The GNSS receiver type. The currently identified types reflect

		the protocol(s) supported by the receiver:



			"NMEA"		NMEA 0183

			"SiRF"		SiRF Binary

			"UBX"		UBX



		Note that also non-"NMEA" type receivers typically support a

		subset of NMEA 0183 with vendor extensions (e.g. to allow

		switching to a vendor protocol).

MAINTAINERS

+1 −0
Original line number Diff line number Diff line
@@ -6041,6 +6041,7 @@ F: include/uapi/linux/gigaset_dev.h 
GNSS SUBSYSTEM

M:	Johan Hovold <johan@kernel.org>

S:	Maintained

F:	Documentation/ABI/testing/sysfs-class-gnss

F:	Documentation/devicetree/bindings/gnss/

F:	drivers/gnss/

F:	include/linux/gnss.h

drivers/gnss/core.c

+49 −0
Original line number Diff line number Diff line
@@ -330,6 +330,52 @@ int gnss_insert_raw(struct gnss_device *gdev, const unsigned char *buf, 
}

EXPORT_SYMBOL_GPL(gnss_insert_raw);



static const char * const gnss_type_names[GNSS_TYPE_COUNT] = {

	[GNSS_TYPE_NMEA]	= "NMEA",

	[GNSS_TYPE_SIRF]	= "SiRF",

	[GNSS_TYPE_UBX]		= "UBX",

};



static const char *gnss_type_name(struct gnss_device *gdev)

{

	const char *name = NULL;



	if (gdev->type < GNSS_TYPE_COUNT)

		name = gnss_type_names[gdev->type];



	if (!name)

		dev_WARN(&gdev->dev, "type name not defined\n");



	return name;

}



static ssize_t type_show(struct device *dev, struct device_attribute *attr,

				char *buf)

{

	struct gnss_device *gdev = to_gnss_device(dev);



	return sprintf(buf, "%s\n", gnss_type_name(gdev));

}

static DEVICE_ATTR_RO(type);



static struct attribute *gnss_attrs[] = {

	&dev_attr_type.attr,

	NULL,

};

ATTRIBUTE_GROUPS(gnss);



static int gnss_uevent(struct device *dev, struct kobj_uevent_env *env)

{

	struct gnss_device *gdev = to_gnss_device(dev);

	int ret;



	ret = add_uevent_var(env, "GNSS_TYPE=%s", gnss_type_name(gdev));

	if (ret)

		return ret;



	return 0;

}



static int __init gnss_module_init(void)

{

	int ret;
@@ -347,6 +393,9 @@ static int __init gnss_module_init(void) 
		goto err_unregister_chrdev;

	}



	gnss_class->dev_groups = gnss_groups;

	gnss_class->dev_uevent = gnss_uevent;



	pr_info("GNSS driver registered with major %d\n", MAJOR(gnss_first));



	return 0;

drivers/gnss/sirf.c

+1 −0
Original line number Diff line number Diff line
@@ -267,6 +267,7 @@ static int sirf_probe(struct serdev_device *serdev) 
	if (!gdev)

		return -ENOMEM;



	gdev->type = GNSS_TYPE_SIRF;

	gdev->ops = &sirf_gnss_ops;

	gnss_set_drvdata(gdev, data);

drivers/gnss/ubx.c

+2 −0
Original line number Diff line number Diff line
@@ -77,6 +77,8 @@ static int ubx_probe(struct serdev_device *serdev) 


	gserial->ops = &ubx_gserial_ops;



	gserial->gdev->type = GNSS_TYPE_UBX;



	data = gnss_serial_get_drvdata(gserial);



	data->vcc = devm_regulator_get(&serdev->dev, "vcc");