diff options
author | Sandeep Patil <sspatil@google.com> | 2016-04-29 07:13:23 -0700 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@google.com> | 2016-04-29 14:09:44 -0700 |
commit | fbbd2b7c0876550b20c6ac0ee2df90ecc262712c (patch) | |
tree | 74171bfbe71b1c29c81f66ff82d234b07a3b6124 /drivers/staging/greybus/hd.c | |
parent | 6ddbed576606a454353638dbbbcc2f66f0fc712d (diff) |
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: Sandeep Patil <sspatil@google.com>
Reviewed-by: Johan Hovold <johan@hovoldconsulting.com>
Reviewed-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Diffstat (limited to 'drivers/staging/greybus/hd.c')
-rw-r--r-- | drivers/staging/greybus/hd.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/drivers/staging/greybus/hd.c b/drivers/staging/greybus/hd.c index 762cc035b128..28634720221d 100644 --- a/drivers/staging/greybus/hd.c +++ b/drivers/staging/greybus/hd.c @@ -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); |