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Commit fbbd2b7c authored by Sandeep Patil's avatar Sandeep Patil Committed by Greg Kroah-Hartman
Browse files

greybus: hd: add bus_id attribute 



The greybus host device id can only be read by parsing the uevent if one
wants to identify a specific host device 'or' bus. This is 'lsgb' uses
today.

This change adds a bus_id attribute so libraries can identify multiple
host devices 'or' bus if they exist.

Testing Done:
Tested on Arche,
'cat /sys/bus/greybus/devices/greysbus1/bus_id'

Signed-off-by: default avatarSandeep Patil <sspatil@google.com>
Reviewed-by: default avatarJohan Hovold <johan@hovoldconsulting.com>
Reviewed-by: default avatarViresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@google.com>
parent 6ddbed57

drivers/staging/greybus/hd.c

+16 −0
Original line number Diff line number Diff line
@@ -24,6 +24,21 @@ int gb_hd_output(struct gb_host_device *hd, void *req, u16 size, u8 cmd, 
}

EXPORT_SYMBOL_GPL(gb_hd_output);



static ssize_t bus_id_show(struct device *dev,

				struct device_attribute *attr, char *buf)

{

	struct gb_host_device *hd = to_gb_host_device(dev);



	return sprintf(buf, "%d\n", hd->bus_id);

}

static DEVICE_ATTR_RO(bus_id);



static struct attribute *bus_attrs[] = {

	&dev_attr_bus_id.attr,

	NULL

};

ATTRIBUTE_GROUPS(bus);



static void gb_hd_release(struct device *dev)

{

	struct gb_host_device *hd = to_gb_host_device(dev);
@@ -98,6 +113,7 @@ struct gb_host_device *gb_hd_create(struct gb_hd_driver *driver, 
	hd->dev.parent = parent;

	hd->dev.bus = &greybus_bus_type;

	hd->dev.type = &greybus_hd_type;

	hd->dev.groups = bus_groups;

	hd->dev.dma_mask = hd->dev.parent->dma_mask;

	device_initialize(&hd->dev);

	dev_set_name(&hd->dev, "greybus%d", hd->bus_id);