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.

Change-Id: If11a531a4b65cbcfb5c5456712c5f965fd4eb4c2
Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Git-commit: ed6fe1f50f0c0fdea674dfa739af50011034bdfa
Git-repo: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Signed-off-by: Ajay Agarwal <ajaya@codeaurora.org>

diff --git a/drivers/usb/gadget/function/f_hid.c b/drivers/usb/gadget/function/f_hid.c
index a5dae5b..b43de80 100644 (file)
--- a/drivers/usb/gadget/function/f_hid.c
+++ b/drivers/usb/gadget/function/f_hid.c
@@ -825,11 +825,21 @@ 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,
 };