--- a/master/slave.c Wed Jun 14 10:23:02 2006 +0000
+++ b/master/slave.c Tue Jun 20 14:40:04 2006 +0000
@@ -166,6 +166,7 @@
INIT_LIST_HEAD(&slave->eeprom_syncs);
INIT_LIST_HEAD(&slave->eeprom_pdos);
INIT_LIST_HEAD(&slave->sdo_dictionary);
+ INIT_LIST_HEAD(&slave->varsize_fields);
for (i = 0; i < 4; i++) {
slave->dl_link[i] = 0;
@@ -192,6 +193,7 @@
ec_eeprom_pdo_entry_t *entry, *next_ent;
ec_sdo_t *sdo, *next_sdo;
ec_sdo_entry_t *en, *next_en;
+ ec_varsize_t *var, *next_var;
slave = container_of(kobj, ec_slave_t, kobj);
@@ -240,6 +242,12 @@
kfree(sdo);
}
+ // free information about variable sized data fields
+ list_for_each_entry_safe(var, next_var, &slave->varsize_fields, list) {
+ list_del(&var->list);
+ kfree(var);
+ }
+
if (slave->eeprom_data) kfree(slave->eeprom_data);
if (slave->new_eeprom_data) kfree(slave->new_eeprom_data);
@@ -1447,6 +1455,43 @@
return -EINVAL;
}
+/*****************************************************************************/
+
+/**
+ \return size of sync manager contents
+*/
+
+size_t ec_slave_calc_sync_size(const ec_slave_t *slave, /**< EtherCAT slave */
+ const ec_sync_t *sync /**< sync manager */
+ )
+{
+ unsigned int i, found;
+ const ec_field_t *field;
+ const ec_varsize_t *var;
+ size_t size;
+
+ // if size is specified, return size
+ if (sync->size) return sync->size;
+
+ // sync manager has variable size (size == 0).
+
+ size = 0;
+ for (i = 0; (field = sync->fields[i]); i++) {
+ found = 0;
+ list_for_each_entry(var, &slave->varsize_fields, list) {
+ if (var->field != field) continue;
+ size += var->size;
+ found = 1;
+ }
+
+ if (!found) {
+ EC_WARN("Variable data field \"%s\" of slave %i has no size"
+ " information!\n", field->name, slave->ring_position);
+ }
+ }
+ return size;
+}
+
/******************************************************************************
* Realtime interface
*****************************************************************************/
@@ -1466,9 +1511,75 @@
/*****************************************************************************/
+/**
+ \return 0 in case of success, else < 0
+ \ingroup RealtimeInterface
+*/
+
+int ecrt_slave_field_size(ec_slave_t *slave, /**< EtherCAT slave */
+ const char *field_name, /**< data field name */
+ unsigned int field_index, /**< data field index */
+ size_t size /**< new data field size */
+ )
+{
+ unsigned int i, j, field_counter;
+ const ec_sync_t *sync;
+ const ec_field_t *field;
+ ec_varsize_t *var;
+
+ if (!slave->type) {
+ EC_ERR("Slave %i has no type information!\n", slave->ring_position);
+ return -1;
+ }
+
+ field_counter = 0;
+ for (i = 0; (sync = slave->type->sync_managers[i]); i++) {
+ for (j = 0; (field = sync->fields[j]); j++) {
+ if (!strcmp(field->name, field_name)) {
+ if (field_counter++ == field_index) {
+ // is the size of this field variable?
+ if (field->size) {
+ EC_ERR("Field \"%s\"[%i] of slave %i has no variable"
+ " size!\n", field->name, field_index,
+ slave->ring_position);
+ return -1;
+ }
+ // does a size specification already exist?
+ list_for_each_entry(var, &slave->varsize_fields, list) {
+ if (var->field == field) {
+ EC_WARN("Resizing field \"%s\"[%i] of slave %i.\n",
+ field->name, field_index,
+ slave->ring_position);
+ var->size = size;
+ return 0;
+ }
+ }
+ // create a new size specification...
+ if (!(var = kmalloc(sizeof(ec_varsize_t), GFP_KERNEL))) {
+ EC_ERR("Failed to allocate memory for varsize_t!\n");
+ return -1;
+ }
+ var->field = field;
+ var->size = size;
+ list_add_tail(&var->list, &slave->varsize_fields);
+ return 0;
+ }
+ }
+ }
+ }
+
+ EC_ERR("Slave %i (\"%s %s\") has no field \"%s\"[%i]!\n",
+ slave->ring_position, slave->type->vendor_name,
+ slave->type->product_name, field_name, field_index);
+ return -1;
+}
+
+/*****************************************************************************/
+
/**< \cond */
EXPORT_SYMBOL(ecrt_slave_write_alias);
+EXPORT_SYMBOL(ecrt_slave_field_size);
/**< \endcond */