am7xxx: factor out a send_command() function

Some packet types do not carry any header_data and thus they can be seen
as commands issued to the device.

Add a send_command() function to handle such packet types, others of
them are going to be added in future commits.

diff --git a/src/am7xxx.c b/src/am7xxx.c
index 405d141..3c7c5b4 100644 (file)
--- a/src/am7xxx.c
+++ b/src/am7xxx.c
@@ -573,6 +573,28 @@ static int send_header(am7xxx_device *dev, struct am7xxx_header *h)
        return ret;
 }
 
+static int send_command(am7xxx_device *dev, am7xxx_packet_type type)
+{
+       struct am7xxx_header h = {
+               .packet_type     = type,
+               .direction       = AM7XXX_DIRECTION_OUT,
+               .header_data_len = 0x00,
+               .unknown2        = 0x3e,
+               .unknown3        = 0x10,
+               .header_data = {
+                       .data = {
+                               .field0 = 0,
+                               .field1 = 0,
+                               .field2 = 0,
+                               .field3 = 0,
+                       },
+               },
+       };
+
+       return send_header(dev, &h);
+}
+
+
 /* When level == AM7XXX_LOG_FATAL do not check the log_level from the context
  * and print the message unconditionally, this makes it possible to print
  * fatal messages even early on initialization, before the context has been
@@ -1025,28 +1047,14 @@ AM7XXX_PUBLIC int am7xxx_get_device_info(am7xxx_device *dev,
                           am7xxx_device_info *device_info)
 {
        int ret;
-       struct am7xxx_header h = {
-               .packet_type     = AM7XXX_PACKET_TYPE_DEVINFO,
-               .direction       = AM7XXX_DIRECTION_OUT,
-               .header_data_len = 0x00,
-               .unknown2        = 0x3e,
-               .unknown3        = 0x10,
-               .header_data = {
-                       .devinfo = {
-                               .native_width  = 0,
-                               .native_height = 0,
-                               .unknown0      = 0,
-                               .unknown1      = 0,
-                       },
-               },
-       };
+       struct am7xxx_header h = { 0 };
 
        if (dev->device_info) {
                memcpy(device_info, dev->device_info, sizeof(*device_info));
                return 0;
        }
 
-       ret = send_header(dev, &h);
+       ret = send_command(dev, AM7XXX_PACKET_TYPE_DEVINFO);
        if (ret < 0)
                return ret;