configmgr: Add get_device_alsadev() to get a device's card/device number

Now that specifying card and device numbers for a device is possible,
add a function to get them.

Change-Id: I78c42a86b09e9ecd93232fa7d0acd0b4dc8b7d22
Signed-off-by: Vincent Knecht <vincent.knecht@mailoo.org>

Author: vknecht

configmgr/audio_config.c

@@ -1080,6 +1080,31 @@ int get_stream_constant_int32(const struct hw_stream *stream,
     return ret;
 }
 
+/*********************************************************************
+ * Device
+ *********************************************************************/
+
+int get_device_alsadev(struct config_mgr *cm, uint32_t type, uint32_t *cardnum, uint32_t *devnum)
+{
+    struct device *pdev = cm->device_array.devices;
+    int dev_count = cm->device_array.count;
+
+    while (dev_count > 0) {
+        if (pdev->type == type) {
+            cardnum = &pdev->card_number;
+            devnum = &pdev->device_number;
+            if (*cardnum < UINT_MAX && *devnum < UINT_MAX) {
+                return 0;
+            }
+            return -ENODEV;
+        }
+        --dev_count;
+        ++pdev;
+    }
+
+    return -ENOENT;
+}
+
 /*********************************************************************
  * Config file parsing
  *

include/tinyhal/audio_config.h

@@ -32,6 +32,7 @@ struct mixer;
 struct mixer_ctl;
 struct config_mgr;
 struct audio_config;
+struct device;
 
 /** Stream type */
 enum stream_type {
@@ -187,6 +188,13 @@ int apply_use_case( const struct hw_stream* stream,
                     const char *setting,
                     const char *case_name);
 
+/** Get the ALSA card and device number associated to this device
+ * @return      0 if the device type has card and device numbers defined
+ * @return      -ENODEV if the device type has no card and device number defined
+ * @return      -ENOENT if the device type was not found
+ */
+int get_device_alsadev(struct config_mgr *cm, uint32_t type, uint32_t *cardnum, uint32_t *devnum);
+
 #if defined(__cplusplus)
 }  /* extern "C" */
 #endif