[PATCH] config: search for PnPID on all parents (#75513)

[Peter Hutterer]

The PnPID for a device may not be on the immediate parent, so search up the
device tree until we find one.

X.Org Bug 75513 <http://bugs.freedesktop.org/show_bug.cgi?id=75513>

Signed-off-by: Peter Hutterer <peter.hutterer at who-t.net>
---
Another fix for the T440 and associated laptops. With Matthew's kernel patch
https://lkml.org/lkml/2014/2/23/63 the PNPID is available in the tree, but
a few parents up from our device.

I'll need a tested-by for the HAL code though, I've only startup-tested it
so far but not triggered the actual code.

 config/hal.c  | 16 +++++++++++++---
 config/udev.c | 15 +++++++++++----
 2 files changed, 24 insertions(+), 7 deletions(-)

diff --git a/config/hal.c b/config/hal.c
index 94cb6e7..ea574ca 100644
--- a/config/hal.c
+++ b/config/hal.c
@@ -185,8 +185,7 @@ device_added(LibHalContext * hal_ctx, const char *udi)
     parent = get_prop_string(hal_ctx, udi, "info.parent");
     if (parent) {
         int usb_vendor, usb_product;
-
-        attrs.pnp_id = get_prop_string(hal_ctx, parent, "pnp.id");
+        char *old_parent;
 
         /* construct USB ID in lowercase - "0000:ffff" */
         usb_vendor = libhal_device_get_property_int(hal_ctx, parent,
@@ -204,7 +203,18 @@ device_added(LibHalContext * hal_ctx, const char *udi)
                 == -1)
                 attrs.usb_id = NULL;
 
-        free(parent);
+        attrs.pnp_id = get_prop_string(hal_ctx, parent, "pnp.id");
+        old_parent = parent;
+
+        while (!attrs.pnp_id &&
+               (parent = get_prop_string(hal_ctx, parent, "info.parent"))) {
+            attrs.pnp_id = get_prop_string(hal_ctx, parent, "pnp.id");
+
+            free(old_parent);
+            old_parent = parent;
+        }
+
+        free(old_parent);
     }
 
     input_options = input_option_new(NULL, "_source", "server/hal");
diff --git a/config/udev.c b/config/udev.c
index 68ed348..2a5d40a 100644
--- a/config/udev.c
+++ b/config/udev.c
@@ -130,10 +130,6 @@ device_added(struct udev_device *udev_device)
             LOG_PROPERTY(ppath, "NAME", name);
         }
 
-        if (pnp_id)
-            attrs.pnp_id = strdup(pnp_id);
-        LOG_SYSATTR(ppath, "id", pnp_id);
-
         /* construct USB ID in lowercase hex - "0000:ffff" */
         if (product &&
             sscanf(product, "%*x/%4x/%4x/%*x", &usb_vendor, &usb_model) == 2) {
@@ -145,6 +141,17 @@ device_added(struct udev_device *udev_device)
                 LOG_PROPERTY(ppath, "PRODUCT", product);
             attrs.usb_id = usb_id;
         }
+
+        while (!pnp_id && (parent = udev_device_get_parent(parent))) {
+            pnp_id = udev_device_get_sysattr_value(parent, "id");
+            if (!pnp_id)
+                continue;
+
+            attrs.pnp_id = strdup(pnp_id);
+            ppath = udev_device_get_devnode(parent);
+            LOG_SYSATTR(ppath, "id", pnp_id);
+        }
+
     }
     if (!name)
         name = "(unnamed)";
-- 
1.8.4.2