gnss: add receiver type support (10f14663) · Commits · 戴 / test

Documentation/ABI/testing/sysfs-class-gnss

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		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).

+1 −0

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		@@ -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

+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;

+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);

+2 −0

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		@@ -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");