Base functions for views

1 files changed, 216 insertions, 14 deletions

diff --git a/pcilib/view.c b/pcilib/view.c
index 1179808..d121f34 100644
--- a/pcilib/view.c
+++ b/pcilib/view.c
@@ -2,25 +2,13 @@
 #include <stdlib.h>
 #include <string.h>
 #include <strings.h>
+#include <alloca.h>
 
 #include "pci.h"
 #include "pcilib.h"
 #include "view.h"
 #include "error.h"
-
-
-pcilib_view_t pcilib_find_view_by_name(pcilib_t *ctx, const char *view) {
-    pcilib_view_t i;
-
-    for(i = 0; ctx->views[i]; i++) {
-        if (!strcasecmp(ctx->views[i]->name, view))
-	    return i;
-    }
-
-    return PCILIB_VIEW_INVALID;
-}
-
-
+#include "value.h"
 
 int pcilib_add_views(pcilib_t *ctx, size_t n, const pcilib_view_description_t *desc) {
     size_t i;
@@ -72,3 +60,217 @@ int pcilib_add_views(pcilib_t *ctx, size_t n, const pcilib_view_description_t *d
 
     return 0;
 }
+
+
+pcilib_view_t pcilib_find_view_by_name(pcilib_t *ctx, const char *name) {
+    pcilib_view_t i;
+
+    for(i = 0; ctx->views[i]; i++) {
+        if (!strcasecmp(ctx->views[i]->name, name))
+	    return i;
+    }
+
+    return PCILIB_VIEW_INVALID;
+}
+
+pcilib_view_t pcilib_find_register_view_by_name(pcilib_t *ctx, pcilib_register_t reg, const char *name) {
+    pcilib_view_t i;
+    pcilib_register_context_t *regctx = &ctx->register_ctx[reg];
+
+    if (!regctx->views) return PCILIB_VIEW_INVALID;
+
+    for (i = 0; regctx->views[i].name; i++) {
+	if (strcasecmp(name, regctx->views[i].name)) {
+	    return pcilib_find_view_by_name(ctx, regctx->views[i].view);
+	}
+    }
+    
+    return PCILIB_VIEW_INVALID;
+}
+
+    // We expect symmetric units. Therefore, we don't distringuish if we read or write
+pcilib_view_t pcilib_find_register_view(pcilib_t *ctx, pcilib_register_t reg, const char *name) {
+    pcilib_view_t i;
+    pcilib_register_context_t *regctx = &ctx->register_ctx[reg];
+
+    if (!regctx->views) return PCILIB_VIEW_INVALID;
+
+	// Check if view is just a name of listed view
+    i = pcilib_find_register_view_by_name(ctx, reg, name);
+    if (i != PCILIB_VIEW_INVALID) return i;
+
+	// Check if view is a unit
+    for (i = 0; regctx->views[i].name; i++) {
+	pcilib_unit_transform_t *trans;
+	pcilib_view_t view = pcilib_find_view_by_name(ctx, regctx->views[i].view);
+	if (view == PCILIB_VIEW_INVALID) continue;
+        
+        if (ctx->views[view]->unit) {
+	    trans = pcilib_find_transform_by_unit_names(ctx, ctx->views[view]->unit, name);
+	    if (trans) return view;
+	}
+    }
+
+    return PCILIB_VIEW_INVALID;
+}
+
+
+typedef struct {
+    pcilib_register_t reg;
+    pcilib_view_t view;
+    pcilib_unit_transform_t *trans;
+} pcilib_view_configuration_t;
+
+static int pcilib_detect_view_configuration(pcilib_t *ctx, const char *bank, const char *regname, const char *view_cname, int write_direction, pcilib_view_configuration_t *cfg) {
+    pcilib_view_t view;
+    pcilib_register_t reg = PCILIB_REGISTER_INVALID;
+    pcilib_unit_transform_t *trans = NULL;
+
+    char *view_name = alloca(strlen(view_cname) + 1);
+    char *unit_name;
+
+
+    strcpy(view_name, view_cname);
+
+    unit_name = strchr(view_name, ':');
+    if (unit_name) {
+	*unit_name = 0;
+	unit_name++;
+    }
+
+    if (regname) {
+	reg = pcilib_find_register(ctx, bank, regname);
+	if (reg == PCILIB_REGISTER_INVALID) {
+	    pcilib_error("Can't find the specified register %s", regname);
+	    return PCILIB_ERROR_NOTFOUND;
+	}
+	
+	// get value
+	
+	if (unit_name) view = pcilib_find_register_view_by_name(ctx, reg, view_name);
+	else view = pcilib_find_register_view(ctx, reg, view_name);
+
+	if (view == PCILIB_VIEW_INVALID) {
+	    pcilib_error("Can't find the specified view %s for register %s", view_name, regname);
+	    return PCILIB_ERROR_NOTFOUND;
+	}
+    } else {
+        view = pcilib_find_view_by_name(ctx, view_name);
+	if (view == PCILIB_VIEW_INVALID) {
+	    pcilib_error("Can't find the specified view %s", view_name);
+	    return PCILIB_ERROR_NOTFOUND;
+	}
+    }
+
+    if (unit_name) {
+        if (write_direction) trans = pcilib_find_transform_by_unit_names(ctx, unit_name, ctx->views[view]->unit);
+        else trans = pcilib_find_transform_by_unit_names(ctx, ctx->views[view]->unit, unit_name);
+
+        if (!trans) {
+            pcilib_error("Don't know how to get the requested unit %s for view %s", unit_name, ctx->views[view]->name);
+            return PCILIB_ERROR_NOTFOUND;
+        }
+            // No transform is required
+        if (!trans->transform) trans = NULL;
+    }
+
+    cfg->reg = reg;
+    cfg->view = view;
+    cfg->trans = trans;
+
+    return 0;
+}
+
+
+int pcilib_read_register_view(pcilib_t *ctx, const char *bank, const char *regname, const char *view, pcilib_value_t *val) {
+    int err;
+
+    pcilib_view_configuration_t cfg;
+    pcilib_register_value_t regvalue = 0;
+
+    err = pcilib_detect_view_configuration(ctx, bank, regname, view, 0, &cfg);
+    if (err) return err;
+
+    if (!ctx->views[cfg.view]->api->read_from_reg) {
+        pcilib_error("The view (%s) does not support reading from the register", view);
+        return PCILIB_ERROR_NOTSUPPORTED;
+    }
+
+    if (regname) {
+        err = pcilib_read_register_by_id(ctx, cfg.reg, &regvalue);
+        if (err) {
+            pcilib_error("Error (%i) reading register %s", err, regname);
+            return err;
+        }
+    }
+
+    pcilib_clean_value(ctx, val);
+
+    err = ctx->views[cfg.view]->api->read_from_reg(ctx, NULL /*???*/, &regvalue, val);
+    if (err) {
+        if (regname) 
+            pcilib_error("Error (%i) computing view (%s) of register %s", err, view, regname);
+        else
+            pcilib_error("Error (%i) computing view %s", err, view);
+        return err;
+    }
+
+    if (cfg.trans) {
+        err = pcilib_transform_unit(ctx, cfg.trans, val);
+        if (err) return err;
+    }
+
+    return 0;
+}
+
+
+int pcilib_write_register_view(pcilib_t *ctx, const char *bank, const char *regname, const char *view, const pcilib_value_t *valarg) {
+    int err;
+    pcilib_value_t val;
+
+    pcilib_view_configuration_t cfg;
+    pcilib_register_value_t regvalue = 0;
+
+    err = pcilib_detect_view_configuration(ctx, bank, regname, view, 1, &cfg);
+    if (err) return err;
+
+    if (!ctx->views[cfg.view]->api->write_to_reg) {
+        pcilib_error("The view (%s) does not support reading from the register", view);
+        return PCILIB_ERROR_NOTSUPPORTED;
+    }
+
+    err = pcilib_copy_value(ctx, &val, valarg);
+    if (err) return err;
+
+    err = pcilib_convert_value_type(ctx, &val, ctx->views[cfg.view]->type);
+    if (err) {
+        pcilib_error("Error (%i) converting the value of type (%s) to type (%s) used by view (%s)", pcilib_get_type_name(val.type), pcilib_get_type_name(ctx->views[cfg.view]->type), view);
+        return err;
+    }
+
+    if (cfg.trans) {
+        err = pcilib_transform_unit(ctx, cfg.trans, &val);
+        if (err) return err;
+    }
+
+
+    err = ctx->views[cfg.view]->api->write_to_reg(ctx, NULL /*???*/, &regvalue, &val);
+    if (err) {
+        if (regname) 
+            pcilib_error("Error (%i) computing view (%s) of register %s", err, view, regname);
+        else
+            pcilib_error("Error (%i) computing view %s", err, view);
+        return err;
+    }
+
+
+    if (regname) {
+        err = pcilib_write_register_by_id(ctx, cfg.reg, regvalue);
+        if (err) {
+            pcilib_error("Error (%i) reading register %s", err, regname);
+            return err;
+        }
+    }
+
+    return 0;
+}