[gnome-settings-daemon] wacom: Add OLED handling over Bluetooth

[Bastien Nocera <hadess src gnome org>]

commit 52c1ad8254035f282c854912d14263dc71e5d46c
Author: Przemo Firszt <przemo firszt eu>
Date:   Tue Jul 2 21:05:24 2013 +0100

    wacom: Add OLED handling over Bluetooth
    
    For the Intuos4 Wireless tablets.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=704167

 plugins/wacom/gsd-wacom-led-helper.c |   97 ++++++++++++++++++++++++---------
 1 files changed, 70 insertions(+), 27 deletions(-)
---
diff --git a/plugins/wacom/gsd-wacom-led-helper.c b/plugins/wacom/gsd-wacom-led-helper.c
index 1924ff3..a00dfdf 100644
--- a/plugins/wacom/gsd-wacom-led-helper.c
+++ b/plugins/wacom/gsd-wacom-led-helper.c
@@ -30,18 +30,19 @@
 #include <string.h>
 #include <gudev/gudev.h>
 
-static gboolean
+#define LED_BRIGHTNESS 127 /* maximum brightness accepted by led on wacom Intuos4 connected over Bluetooth */
+
+static int
 gsd_wacom_led_helper_write (const gchar *filename, gint value, GError **error)
 {
        gchar *text = NULL;
        gint retval;
        gint length;
        gint fd = -1;
-       gboolean ret = TRUE;
+       int ret = 1;
 
        fd = open (filename, O_WRONLY);
        if (fd < 0) {
-               ret = FALSE;
                g_set_error (error, 1, 0, "failed to open filename: %s", filename);
                goto out;
        }
@@ -53,10 +54,10 @@ gsd_wacom_led_helper_write (const gchar *filename, gint value, GError **error)
        /* write to device file */
        retval = write (fd, text, length);
        if (retval != length) {
-               ret = FALSE;
                g_set_error (error, 1, 0, "writing '%s' to %s failed", text, filename);
                goto out;
-       }
+       } else
+               ret = 0;
 out:
        if (fd >= 0)
                close (fd);
@@ -65,28 +66,76 @@ out:
 }
 
 static char *
-get_led_sysfs_path (GUdevDevice *device,
-                   int          group_num)
+get_led_sys_path (GUdevClient *client,
+                 GUdevDevice *device,
+                 int          group_num,
+                 int          led_num,
+                 gboolean     usb,
+                 int         *write_value)
 {
-       char *status;
-       char *filename;
-
-       status = g_strdup_printf ("status_led%d_select", group_num);
-       filename = g_build_filename (g_udev_device_get_sysfs_path (device), "wacom_led", status, NULL);
+       GUdevDevice *parent;
+       char *status = NULL;
+       char *filename = NULL;
+       GUdevDevice *hid_dev;
+       const char *dev_uniq;
+       GList *hid_list;
+       GList *element;
+       const char *dev_hid_uniq;
+
+       if (usb) {
+               parent = g_udev_device_get_parent_with_subsystem (device, "usb", "usb_interface");
+               if (!parent)
+                       goto no_parent;
+               status = g_strdup_printf ("status_led%d_select", group_num);
+               filename = g_build_filename (g_udev_device_get_sysfs_path (parent), "wacom_led", status, 
NULL);
+
+               *write_value = led_num;
+        } else {
+               parent = g_udev_device_get_parent_with_subsystem (device, "input", NULL);
+               if (!parent)
+                       goto no_parent;
+               dev_uniq = g_udev_device_get_property (parent, "UNIQ");
+
+               hid_list =  g_udev_client_query_by_subsystem (client, "hid");
+               element = g_list_first(hid_list);
+               while (element) {
+                       hid_dev = (GUdevDevice*)element->data;
+                       dev_hid_uniq = g_udev_device_get_property (hid_dev, "HID_UNIQ");
+                       if (g_strrstr (dev_uniq, dev_hid_uniq)){
+                               status = g_strdup_printf ("/leds/%s:selector:%i/brightness", 
g_udev_device_get_name (hid_dev), led_num);
+                               filename = g_build_filename (g_udev_device_get_sysfs_path (hid_dev), status, 
NULL);
+                               break;
+                       }
+                       element = g_list_next(element);
+               }
+               g_list_free_full(hid_list, g_object_unref);
+
+               *write_value = LED_BRIGHTNESS;
+       }
        g_free (status);
 
+       g_object_unref (parent);
+
        return filename;
+
+no_parent:
+       g_debug ("Could not find proper parent device for '%s'",
+                g_udev_device_get_device_file (device));
+
+       return NULL;
 }
 
 int main (int argc, char **argv)
 {
        GOptionContext *context;
        GUdevClient *client;
-       GUdevDevice *device, *parent;
+       GUdevDevice *device;
        int uid, euid;
        char *filename;
+       gboolean usb;
+       int value;
        GError *error = NULL;
-        const char * const subsystems[] = { "input", NULL };
+        const char * const subsystems[] = { "hid", "input", NULL };
         int ret = 1;
 
        char *path = NULL;
@@ -141,22 +190,16 @@ int main (int argc, char **argv)
                goto out;
        }
 
-       if (g_strcmp0 (g_udev_device_get_property (device, "ID_BUS"), "usb") != 0) {
-               /* FIXME handle Bluetooth LEDs too */
-               g_debug ("Non-USB LEDs setting is not supported");
-               goto out;
-       }
+       if (g_strcmp0 (g_udev_device_get_property (device, "ID_BUS"), "usb") != 0)
+               usb = FALSE;
+       else
+               usb = TRUE;
 
-       parent = g_udev_device_get_parent_with_subsystem (device, "usb", "usb_interface");
-       if (parent == NULL) {
-               g_debug ("Could not find parent USB device for '%s'", path);
+       filename = get_led_sys_path (client, device, group_num, led_num, usb, &value);
+       if (!filename)
                goto out;
-       }
-       g_object_unref (device);
-       device = parent;
 
-       filename = get_led_sysfs_path (device, group_num);
-       if (gsd_wacom_led_helper_write (filename, led_num, &error) == FALSE) {
+       if (gsd_wacom_led_helper_write (filename, value, &error)) {
                g_debug ("Could not set LED status for '%s': %s", path, error->message);
                g_error_free (error);
                g_free (filename);