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usb: gadget: f_hid: add dev to configfs 

Even if the /dev/hidg* chardev is automatically created, one
has to guess which one belongs to which function. In the case
of multiple HID functions, or maybe even multiple peripherals,
this becomes difficult.

Add the dev (with major and minor number) to configfs to allow
looking up (or even creating) the right device node for each
function. This file is read-only.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
hifive-unleashed-5.1
Johannes Berg 2016-06-23 22:28:54 +02:00 committed by Felipe Balbi
parent 00af62330c
commit ed6fe1f50f
1 changed files with 10 additions and 0 deletions
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10
drivers/usb/gadget/function/f_hid.c
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@ -809,11 +809,21 @@ end:
CONFIGFS_ATTR(f_hid_opts_, report_desc);
static ssize_t f_hid_opts_dev_show(struct config_item *item, char *page)
{
struct f_hid_opts *opts = to_f_hid_opts(item);
return sprintf(page, "%d:%d\n", major, opts->minor);
}
CONFIGFS_ATTR_RO(f_hid_opts_, dev);
static struct configfs_attribute *hid_attrs[] = {
&f_hid_opts_attr_subclass,
&f_hid_opts_attr_protocol,
&f_hid_opts_attr_report_length,
&f_hid_opts_attr_report_desc,
&f_hid_opts_attr_dev,
NULL,
};