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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 <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
This commit is contained in:
Johan Hovold 2018-06-01 10:22:59 +02:00 • committed by Greg Kroah-Hartman
commit 10f146639f
6 changed files with 77 additions and 0 deletions
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49
drivers/gnss/core.c
View file

@ -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
drivers/gnss/sirf.c
View file

@ -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
drivers/gnss/ubx.c
View file

@ -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");