get additional device data from udev

1 files changed, 142 insertions, 0 deletions

diff --git a/src/modules/udev-util.c b/src/modules/udev-util.c
new file mode 100644
index 00000000..a72bc8f8
--- /dev/null
+++ b/src/modules/udev-util.c
@@ -0,0 +1,142 @@
+/***
+  This file is part of PulseAudio.
+
+  Copyright 2009 Lennart Poettering
+
+  PulseAudio is free software; you can redistribute it and/or modify
+  it under the terms of the GNU Lesser General Public License as
+  published by the Free Software Foundation; either version 2 of the
+  License, or (at your option) any later version.
+
+  PulseAudio is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+  General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public
+  License along with PulseAudio; if not, write to the Free Software
+  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
+  USA.
+***/
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <libudev.h>
+
+#include <pulse/xmalloc.h>
+#include <pulse/proplist.h>
+
+#include <pulsecore/log.h>
+#include <pulsecore/core-util.h>
+
+#include "udev-util.h"
+
+static int read_id(struct udev_device *d, const char *n) {
+    const char *v;
+    unsigned u;
+
+    pa_assert(d);
+    pa_assert(n);
+
+    if (!(v = udev_device_get_property_value(d, n)))
+        return -1;
+
+    if (pa_startswith(v, "0x"))
+        v += 2;
+
+    if (!*v)
+        return -1;
+
+    if (sscanf(v, "%04x", &u) != 1)
+        return -1;
+
+    if (u > 0xFFFFU)
+        return -1;
+
+    return u;
+}
+
+int pa_udev_get_info(pa_core *core, pa_proplist *p, int card_idx) {
+    int r = -1;
+    struct udev *udev;
+    struct udev_device *card;
+    char *t;
+    const char *v;
+    int id;
+
+    pa_assert(core);
+    pa_assert(p);
+    pa_assert(card_idx >= 0);
+
+    if (!(udev = udev_new())) {
+        pa_log_error("Failed to allocate udev context.");
+        goto finish;
+    }
+
+    t = pa_sprintf_malloc("%s/class/sound/card%i", udev_get_sys_path(udev), card_idx);
+    card = udev_device_new_from_syspath(udev, t);
+    pa_xfree(t);
+
+    if (!card) {
+        pa_log_error("Failed to get card object.");
+        goto finish;
+    }
+
+    if (!pa_proplist_contains(p, PA_PROP_DEVICE_BUS))
+        if ((v = udev_device_get_property_value(card, "ID_BUS")) && *v)
+            pa_proplist_sets(p, PA_PROP_DEVICE_BUS, v);
+
+    if (!pa_proplist_contains(p, PA_PROP_DEVICE_VENDOR_ID))
+        if ((id = read_id(card, "ID_VENDOR_ID")) > 0 && *v)
+            pa_proplist_setf(p, PA_PROP_DEVICE_VENDOR_ID, "%04x", id);
+
+    if (!pa_proplist_contains(p, PA_PROP_DEVICE_VENDOR_NAME)) {
+        if ((v = udev_device_get_property_value(card, "ID_VENDOR_FROM_DATABASE")) && *v)
+            pa_proplist_sets(p, PA_PROP_DEVICE_VENDOR_NAME, v);
+        else if ((v = udev_device_get_property_value(card, "ID_VENDOR")) && *v)
+            pa_proplist_sets(p, PA_PROP_DEVICE_VENDOR_NAME, v);
+    }
+
+    if (!pa_proplist_contains(p, PA_PROP_DEVICE_PRODUCT_ID))
+        if ((id = read_id(card, "ID_MODEL_ID")) >= 0)
+            pa_proplist_setf(p, PA_PROP_DEVICE_PRODUCT_ID, "%04x", id);
+
+    if (!pa_proplist_contains(p, PA_PROP_DEVICE_PRODUCT_NAME)) {
+        if ((v = udev_device_get_property_value(card, "ID_MODEL_FROM_DATABASE")) && *v)
+            pa_proplist_sets(p, PA_PROP_DEVICE_PRODUCT_NAME, v);
+        else if ((v = udev_device_get_property_value(card, "ID_MODEL")) && *v)
+            pa_proplist_sets(p, PA_PROP_DEVICE_PRODUCT_NAME, v);
+    }
+
+    if (!pa_proplist_contains(p, PA_PROP_DEVICE_SERIAL))
+        if ((v = udev_device_get_property_value(card, "ID_SERIAL")) && *v)
+            pa_proplist_sets(p, PA_PROP_DEVICE_SERIAL, v);
+
+    if (!pa_proplist_contains(p, PA_PROP_DEVICE_FORM_FACTOR))
+        if ((v = udev_device_get_property_value(card, "SOUND_FORM_FACTOR")) && *v)
+            pa_proplist_sets(p, PA_PROP_DEVICE_FORM_FACTOR, v);
+
+    if (!pa_proplist_contains(p, PA_PROP_DEVICE_BUS_PATH))
+        if ((v = udev_device_get_devpath(card)))
+            pa_proplist_sets(p, PA_PROP_DEVICE_BUS_PATH, v);
+
+    /* This is normaly not set by th udev rules but may be useful to
+     * allow administrators to overwrite the device description.*/
+    if (!pa_proplist_contains(p, PA_PROP_DEVICE_DESCRIPTION))
+        if ((v = udev_device_get_property_value(card, "SOUND_DESCRIPTION")) && *v)
+            pa_proplist_sets(p, PA_PROP_DEVICE_DESCRIPTION, v);
+
+    r = 0;
+
+finish:
+
+    if (card)
+        udev_device_unref(card);
+
+    if (udev)
+        udev_unref(udev);
+
+    return r;
+}