Add axis API implementation

lib/libx52io/Makefile.am

@@ -13,7 +13,7 @@ lib_LTLIBRARIES = libx52io.la
 libx52io_v_CUR=0
 libx52io_v_AGE=0
 libx52io_v_REV=0
-libx52io_la_SOURCES = io_core.c
+libx52io_la_SOURCES = io_core.c io_axis.c
 libx52io_la_CFLAGS = @HIDAPI_CFLAGS@ -DLOCALEDIR=\"$(localedir)\" -I $(top_srcdir) $(WARN_CFLAGS)
 libx52io_la_LDFLAGS = \
 	-export-symbols-regex '^libx52io_' \

lib/libx52io/io_axis.c

@@ -0,0 +1,62 @@
+/*
+ * Saitek X52 IO driver - axis ranges
+ *
+ * Copyright (C) 2012-2020 Nirenjan Krishnan (nirenjan@nirenjan.org)
+ *
+ * SPDX-License-Identifier: GPL-2.0-only WITH Classpath-exception-2.0
+ */
+
+#include <string.h>
+#include "io_common.h"
+
+static const int32_t x52_axis_max[] = {
+    2047, 2047, 1023, 255, 255, 255, 255, 15, 15
+};
+
+static const int32_t x52pro_axis_max[] = {
+    1023, 1023, 1023, 255, 255, 255, 255, 15, 15
+};
+
+void _x52io_set_axis_range(libx52io_context *ctx)
+{
+    switch (ctx->pid) {
+    case 0x0255:
+    case 0x075c:
+        memcpy(ctx->axis_max, x52_axis_max, sizeof(ctx->axis_max));
+        break;
+
+    case 0x0762:
+        memcpy(ctx->axis_max, x52pro_axis_max, sizeof(ctx->axis_max));
+        break;
+
+    default:
+        break;
+    }
+}
+
+int libx52io_get_axis_range(libx52io_context *ctx,
+                            libx52io_axis axis,
+                            int32_t *min,
+                            int32_t *max)
+{
+    if (ctx == NULL || min == NULL || max == NULL) {
+        return LIBX52IO_ERROR_INVALID;
+    }
+
+    if (axis < 0 || axis >= LIBX52IO_AXIS_MAX) {
+        return LIBX52IO_ERROR_INVALID;
+    }
+
+    if (ctx->handle == NULL) {
+        return LIBX52IO_ERROR_NO_DEVICE;
+    }
+
+    /*
+     * All axis ranges start at 0, only the max value changes between
+     * X52 and X52Pro
+     */
+    *min = 0;
+    *max = ctx->axis_max[axis];
+
+    return LIBX52IO_SUCCESS;
+}

lib/libx52io/io_common.h

@@ -19,7 +19,6 @@ typedef int (*x52_parse_report)(unsigned char *data, int length);
 struct libx52io_context {
     hid_device *handle;
 
-    int32_t axis_min[LIBX52IO_AXIS_MAX];
     int32_t axis_max[LIBX52IO_AXIS_MAX];
 
     int16_t pid;

lib/libx52io/io_core.c

@@ -84,7 +84,7 @@ int libx52io_open(libx52io_context *ctx)
             }
 
             ctx->pid = cur_dev->product_id;
-            /* _x52io_set_axis_range(ctx); */
+            _x52io_set_axis_range(ctx);
             /* _x52io_set_report_parser(ctx); */
 
             break;