1 files changed, 348 insertions, 0 deletions

diff --git a/drivers/isdn/mISDN/dsp_pipeline.c b/drivers/isdn/mISDN/dsp_pipeline.c
new file mode 100644
index 000000000000..850260ab57d0
--- /dev/null
+++ b/drivers/isdn/mISDN/dsp_pipeline.c
@@ -0,0 +1,348 @@
+/*
+ * dsp_pipeline.c: pipelined audio processing
+ *
+ * Copyright (C) 2007, Nadi Sarrar
+ *
+ * Nadi Sarrar <nadi@beronet.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc., 59
+ * Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+ *
+ * The full GNU General Public License is included in this distribution in the
+ * file called LICENSE.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/list.h>
+#include <linux/string.h>
+#include <linux/mISDNif.h>
+#include <linux/mISDNdsp.h>
+#include "dsp.h"
+#include "dsp_hwec.h"
+
+/* uncomment for debugging */
+/*#define PIPELINE_DEBUG*/
+
+struct dsp_pipeline_entry {
+        struct mISDN_dsp_element *elem;
+        void                *p;
+        struct list_head     list;
+};
+struct dsp_element_entry {
+        struct mISDN_dsp_element *elem;
+        struct device        dev;
+        struct list_head     list;
+};
+
+static LIST_HEAD(dsp_elements);
+
+/* sysfs */
+static struct class *elements_class;
+
+static ssize_t
+attr_show_args(struct device *dev, struct device_attribute *attr, char *buf)
+{
+        struct mISDN_dsp_element *elem = dev_get_drvdata(dev);
+        ssize_t len = 0;
+        int i = 0;
+
+        *buf = 0;
+        for (; i < elem->num_args; ++i)
+                len = sprintf(buf, "%sName:        %s\n%s%s%sDescription: %s\n"
+                        "\n", buf,
+                          elem->args[i].name,
+                          elem->args[i].def ? "Default:     " : "",
+                          elem->args[i].def ? elem->args[i].def : "",
+                          elem->args[i].def ? "\n" : "",
+                          elem->args[i].desc);
+
+        return len;
+}
+
+static struct device_attribute element_attributes[] = {
+        __ATTR(args, 0444, attr_show_args, NULL),
+};
+
+int mISDN_dsp_element_register(struct mISDN_dsp_element *elem)
+{
+        struct dsp_element_entry *entry;
+        int ret, i;
+
+        if (!elem)
+                return -EINVAL;
+
+        entry = kzalloc(sizeof(struct dsp_element_entry), GFP_KERNEL);
+        if (!entry)
+                return -ENOMEM;
+
+        entry->elem = elem;
+
+        entry->dev.class = elements_class;
+        dev_set_drvdata(&entry->dev, elem);
+        snprintf(entry->dev.bus_id, BUS_ID_SIZE, elem->name);
+        ret = device_register(&entry->dev);
+        if (ret) {
+                printk(KERN_ERR "%s: failed to register %s\n",
+                        __func__, elem->name);
+                goto err1;
+        }
+
+        for (i = 0; i < (sizeof(element_attributes)
+                / sizeof(struct device_attribute)); ++i)
+                ret = device_create_file(&entry->dev,
+                                &element_attributes[i]);
+                if (ret) {
+                        printk(KERN_ERR "%s: failed to create device file\n",
+                                __func__);
+                        goto err2;
+                }
+
+        list_add_tail(&entry->list, &dsp_elements);
+
+        printk(KERN_DEBUG "%s: %s registered\n", __func__, elem->name);
+
+        return 0;
+
+err2:
+        device_unregister(&entry->dev);
+err1:
+        kfree(entry);
+        return ret;
+}
+EXPORT_SYMBOL(mISDN_dsp_element_register);
+
+void mISDN_dsp_element_unregister(struct mISDN_dsp_element *elem)
+{
+        struct dsp_element_entry *entry, *n;
+
+        if (!elem)
+                return;
+
+        list_for_each_entry_safe(entry, n, &dsp_elements, list)
+                if (entry->elem == elem) {
+                        list_del(&entry->list);
+                        device_unregister(&entry->dev);
+                        kfree(entry);
+                        printk(KERN_DEBUG "%s: %s unregistered\n",
+                                __func__, elem->name);
+                        return;
+                }
+        printk(KERN_ERR "%s: element %s not in list.\n", __func__, elem->name);
+}
+EXPORT_SYMBOL(mISDN_dsp_element_unregister);
+
+int dsp_pipeline_module_init(void)
+{
+        elements_class = class_create(THIS_MODULE, "dsp_pipeline");
+        if (IS_ERR(elements_class))
+                return PTR_ERR(elements_class);
+
+#ifdef PIPELINE_DEBUG
+        printk(KERN_DEBUG "%s: dsp pipeline module initialized\n", __func__);
+#endif
+
+        dsp_hwec_init();
+
+        return 0;
+}
+
+void dsp_pipeline_module_exit(void)
+{
+        struct dsp_element_entry *entry, *n;
+
+        dsp_hwec_exit();
+
+        class_destroy(elements_class);
+
+        list_for_each_entry_safe(entry, n, &dsp_elements, list) {
+                list_del(&entry->list);
+                printk(KERN_WARNING "%s: element was still registered: %s\n",
+                        __func__, entry->elem->name);
+                kfree(entry);
+        }
+
+        printk(KERN_DEBUG "%s: dsp pipeline module exited\n", __func__);
+}
+
+int dsp_pipeline_init(struct dsp_pipeline *pipeline)
+{
+        if (!pipeline)
+                return -EINVAL;
+
+        INIT_LIST_HEAD(&pipeline->list);
+
+#ifdef PIPELINE_DEBUG
+        printk(KERN_DEBUG "%s: dsp pipeline ready\n", __func__);
+#endif
+
+        return 0;
+}
+
+static inline void _dsp_pipeline_destroy(struct dsp_pipeline *pipeline)
+{
+        struct dsp_pipeline_entry *entry, *n;
+
+        list_for_each_entry_safe(entry, n, &pipeline->list, list) {
+                list_del(&entry->list);
+                if (entry->elem == dsp_hwec)
+                        dsp_hwec_disable(container_of(pipeline, struct dsp,
+                                pipeline));
+                else
+                        entry->elem->free(entry->p);
+                kfree(entry);
+        }
+}
+
+void dsp_pipeline_destroy(struct dsp_pipeline *pipeline)
+{
+
+        if (!pipeline)
+                return;
+
+        _dsp_pipeline_destroy(pipeline);
+
+#ifdef PIPELINE_DEBUG
+        printk(KERN_DEBUG "%s: dsp pipeline destroyed\n", __func__);
+#endif
+}
+
+int dsp_pipeline_build(struct dsp_pipeline *pipeline, const char *cfg)
+{
+        int len, incomplete = 0, found = 0;
+        char *dup, *tok, *name, *args;
+        struct dsp_element_entry *entry, *n;
+        struct dsp_pipeline_entry *pipeline_entry;
+        struct mISDN_dsp_element *elem;
+
+        if (!pipeline)
+                return -EINVAL;
+
+        if (!list_empty(&pipeline->list))
+                _dsp_pipeline_destroy(pipeline);
+
+        if (!cfg)
+                return 0;
+
+        len = strlen(cfg);
+        if (!len)
+                return 0;
+
+        dup = kmalloc(len + 1, GFP_KERNEL);
+        if (!dup)
+                return 0;
+        strcpy(dup, cfg);
+        while ((tok = strsep(&dup, "|"))) {
+                if (!strlen(tok))
+                        continue;
+                name = strsep(&tok, "(");
+                args = strsep(&tok, ")");
+                if (args && !*args)
+                        args = 0;
+
+                list_for_each_entry_safe(entry, n, &dsp_elements, list)
+                        if (!strcmp(entry->elem->name, name)) {
+                                elem = entry->elem;
+
+                                pipeline_entry = kmalloc(sizeof(struct
+                                        dsp_pipeline_entry), GFP_KERNEL);
+                                if (!pipeline_entry) {
+                                        printk(KERN_DEBUG "%s: failed to add "
+                                            "entry to pipeline: %s (out of "
+                                            "memory)\n", __func__, elem->name);
+                                        incomplete = 1;
+                                        goto _out;
+                                }
+                                pipeline_entry->elem = elem;
+
+                                if (elem == dsp_hwec) {
+                                        /* This is a hack to make the hwec
+                                           available as a pipeline module */
+                                        dsp_hwec_enable(container_of(pipeline,
+                                                struct dsp, pipeline), args);
+                                        list_add_tail(&pipeline_entry->list,
+                                                &pipeline->list);
+                                } else {
+                                        pipeline_entry->p = elem->new(args);
+                                        if (pipeline_entry->p) {
+                                                list_add_tail(&pipeline_entry->
+                                                        list, &pipeline->list);
+#ifdef PIPELINE_DEBUG
+                                                printk(KERN_DEBUG "%s: created "
+                                                    "instance of %s%s%s\n",
+                                                    __func__, name, args ?
+                                                    " with args " : "", args ?
+                                                    args : "");
+#endif
+                                        } else {
+                                                printk(KERN_DEBUG "%s: failed "
+                                                  "to add entry to pipeline: "
+                                                  "%s (new() returned NULL)\n",
+                                                  __func__, elem->name);
+                                                kfree(pipeline_entry);
+                                                incomplete = 1;
+                                        }
+                                }
+                                found = 1;
+                                break;
+                        }
+
+                if (found)
+                        found = 0;
+                else {
+                        printk(KERN_DEBUG "%s: element not found, skipping: "
+                                "%s\n", __func__, name);
+                        incomplete = 1;
+                }
+        }
+
+_out:
+        if (!list_empty(&pipeline->list))
+                pipeline->inuse = 1;
+        else
+                pipeline->inuse = 0;
+
+#ifdef PIPELINE_DEBUG
+        printk(KERN_DEBUG "%s: dsp pipeline built%s: %s\n",
+                __func__, incomplete ? " incomplete" : "", cfg);
+#endif
+        kfree(dup);
+        return 0;
+}
+
+void dsp_pipeline_process_tx(struct dsp_pipeline *pipeline, u8 *data, int len)
+{
+        struct dsp_pipeline_entry *entry;
+
+        if (!pipeline)
+                return;
+
+        list_for_each_entry(entry, &pipeline->list, list)
+                if (entry->elem->process_tx)
+                        entry->elem->process_tx(entry->p, data, len);
+}
+
+void dsp_pipeline_process_rx(struct dsp_pipeline *pipeline, u8 *data, int len)
+{
+        struct dsp_pipeline_entry *entry;
+
+        if (!pipeline)
+                return;
+
+        list_for_each_entry_reverse(entry, &pipeline->list, list)
+                if (entry->elem->process_rx)
+                        entry->elem->process_rx(entry->p, data, len);
+}
+
+