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1/*
2 * dsp_pipeline.c: pipelined audio processing
3 *
4 * Copyright (C) 2007, Nadi Sarrar
5 *
6 * Nadi Sarrar <nadi@beronet.com>
7 *
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by the Free
10 * Software Foundation; either version 2 of the License, or (at your option)
11 * any later version.
12 *
13 * This program is distributed in the hope that it will be useful, but WITHOUT
14 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
16 * more details.
17 *
18 * You should have received a copy of the GNU General Public License along with
19 * this program; if not, write to the Free Software Foundation, Inc., 59
20 * Temple Place - Suite 330, Boston, MA 02111-1307, USA.
21 *
22 * The full GNU General Public License is included in this distribution in the
23 * file called LICENSE.
24 *
25 */
26
27#include <linux/kernel.h>
28#include <linux/slab.h>
29#include <linux/list.h>
30#include <linux/string.h>
31#include <linux/mISDNif.h>
32#include <linux/mISDNdsp.h>
33#include <linux/export.h>
34#include "dsp.h"
35#include "dsp_hwec.h"
36
37/* uncomment for debugging */
38/*#define PIPELINE_DEBUG*/
39
40struct dsp_pipeline_entry {
41 struct mISDN_dsp_element *elem;
42 void *p;
43 struct list_head list;
44};
45struct dsp_element_entry {
46 struct mISDN_dsp_element *elem;
47 struct device dev;
48 struct list_head list;
49};
50
51static LIST_HEAD(dsp_elements);
52
53/* sysfs */
54static struct class *elements_class;
55
56static ssize_t
57attr_show_args(struct device *dev, struct device_attribute *attr, char *buf)
58{
59 struct mISDN_dsp_element *elem = dev_get_drvdata(dev);
60 int i;
61 char *p = buf;
62
63 *buf = 0;
64 for (i = 0; i < elem->num_args; i++)
65 p += sprintf(p, "Name: %s\n%s%s%sDescription: %s\n\n",
66 elem->args[i].name,
67 elem->args[i].def ? "Default: " : "",
68 elem->args[i].def ? elem->args[i].def : "",
69 elem->args[i].def ? "\n" : "",
70 elem->args[i].desc);
71
72 return p - buf;
73}
74
75static struct device_attribute element_attributes[] = {
76 __ATTR(args, 0444, attr_show_args, NULL),
77};
78
79static void
80mISDN_dsp_dev_release(struct device *dev)
81{
82 struct dsp_element_entry *entry =
83 container_of(dev, struct dsp_element_entry, dev);
84 list_del(&entry->list);
85 kfree(entry);
86}
87
88int mISDN_dsp_element_register(struct mISDN_dsp_element *elem)
89{
90 struct dsp_element_entry *entry;
91 int ret, i;
92
93 if (!elem)
94 return -EINVAL;
95
96 entry = kzalloc(sizeof(struct dsp_element_entry), GFP_ATOMIC);
97 if (!entry)
98 return -ENOMEM;
99
100 entry->elem = elem;
101
102 entry->dev.class = elements_class;
103 entry->dev.release = mISDN_dsp_dev_release;
104 dev_set_drvdata(&entry->dev, elem);
105 dev_set_name(&entry->dev, elem->name);
106 ret = device_register(&entry->dev);
107 if (ret) {
108 printk(KERN_ERR "%s: failed to register %s\n",
109 __func__, elem->name);
110 goto err1;
111 }
112 list_add_tail(&entry->list, &dsp_elements);
113
114 for (i = 0; i < ARRAY_SIZE(element_attributes); ++i) {
115 ret = device_create_file(&entry->dev,
116 &element_attributes[i]);
117 if (ret) {
118 printk(KERN_ERR "%s: failed to create device file\n",
119 __func__);
120 goto err2;
121 }
122 }
123
124#ifdef PIPELINE_DEBUG
125 printk(KERN_DEBUG "%s: %s registered\n", __func__, elem->name);
126#endif
127
128 return 0;
129
130err2:
131 device_unregister(&entry->dev);
132 return ret;
133err1:
134 kfree(entry);
135 return ret;
136}
137EXPORT_SYMBOL(mISDN_dsp_element_register);
138
139void mISDN_dsp_element_unregister(struct mISDN_dsp_element *elem)
140{
141 struct dsp_element_entry *entry, *n;
142
143 if (!elem)
144 return;
145
146 list_for_each_entry_safe(entry, n, &dsp_elements, list)
147 if (entry->elem == elem) {
148 device_unregister(&entry->dev);
149#ifdef PIPELINE_DEBUG
150 printk(KERN_DEBUG "%s: %s unregistered\n",
151 __func__, elem->name);
152#endif
153 return;
154 }
155 printk(KERN_ERR "%s: element %s not in list.\n", __func__, elem->name);
156}
157EXPORT_SYMBOL(mISDN_dsp_element_unregister);
158
159int dsp_pipeline_module_init(void)
160{
161 elements_class = class_create(THIS_MODULE, "dsp_pipeline");
162 if (IS_ERR(elements_class))
163 return PTR_ERR(elements_class);
164
165#ifdef PIPELINE_DEBUG
166 printk(KERN_DEBUG "%s: dsp pipeline module initialized\n", __func__);
167#endif
168
169 dsp_hwec_init();
170
171 return 0;
172}
173
174void dsp_pipeline_module_exit(void)
175{
176 struct dsp_element_entry *entry, *n;
177
178 dsp_hwec_exit();
179
180 class_destroy(elements_class);
181
182 list_for_each_entry_safe(entry, n, &dsp_elements, list) {
183 list_del(&entry->list);
184 printk(KERN_WARNING "%s: element was still registered: %s\n",
185 __func__, entry->elem->name);
186 kfree(entry);
187 }
188
189#ifdef PIPELINE_DEBUG
190 printk(KERN_DEBUG "%s: dsp pipeline module exited\n", __func__);
191#endif
192}
193
194int dsp_pipeline_init(struct dsp_pipeline *pipeline)
195{
196 if (!pipeline)
197 return -EINVAL;
198
199 INIT_LIST_HEAD(&pipeline->list);
200
201#ifdef PIPELINE_DEBUG
202 printk(KERN_DEBUG "%s: dsp pipeline ready\n", __func__);
203#endif
204
205 return 0;
206}
207
208static inline void _dsp_pipeline_destroy(struct dsp_pipeline *pipeline)
209{
210 struct dsp_pipeline_entry *entry, *n;
211
212 list_for_each_entry_safe(entry, n, &pipeline->list, list) {
213 list_del(&entry->list);
214 if (entry->elem == dsp_hwec)
215 dsp_hwec_disable(container_of(pipeline, struct dsp,
216 pipeline));
217 else
218 entry->elem->free(entry->p);
219 kfree(entry);
220 }
221}
222
223void dsp_pipeline_destroy(struct dsp_pipeline *pipeline)
224{
225
226 if (!pipeline)
227 return;
228
229 _dsp_pipeline_destroy(pipeline);
230
231#ifdef PIPELINE_DEBUG
232 printk(KERN_DEBUG "%s: dsp pipeline destroyed\n", __func__);
233#endif
234}
235
236int dsp_pipeline_build(struct dsp_pipeline *pipeline, const char *cfg)
237{
238 int len, incomplete = 0, found = 0;
239 char *dup, *tok, *name, *args;
240 struct dsp_element_entry *entry, *n;
241 struct dsp_pipeline_entry *pipeline_entry;
242 struct mISDN_dsp_element *elem;
243
244 if (!pipeline)
245 return -EINVAL;
246
247 if (!list_empty(&pipeline->list))
248 _dsp_pipeline_destroy(pipeline);
249
250 if (!cfg)
251 return 0;
252
253 len = strlen(cfg);
254 if (!len)
255 return 0;
256
257 dup = kmalloc(len + 1, GFP_ATOMIC);
258 if (!dup)
259 return 0;
260 strcpy(dup, cfg);
261 while ((tok = strsep(&dup, "|"))) {
262 if (!strlen(tok))
263 continue;
264 name = strsep(&tok, "(");
265 args = strsep(&tok, ")");
266 if (args && !*args)
267 args = NULL;
268
269 list_for_each_entry_safe(entry, n, &dsp_elements, list)
270 if (!strcmp(entry->elem->name, name)) {
271 elem = entry->elem;
272
273 pipeline_entry = kmalloc(sizeof(struct
274 dsp_pipeline_entry), GFP_ATOMIC);
275 if (!pipeline_entry) {
276 printk(KERN_ERR "%s: failed to add "
277 "entry to pipeline: %s (out of "
278 "memory)\n", __func__, elem->name);
279 incomplete = 1;
280 goto _out;
281 }
282 pipeline_entry->elem = elem;
283
284 if (elem == dsp_hwec) {
285 /* This is a hack to make the hwec
286 available as a pipeline module */
287 dsp_hwec_enable(container_of(pipeline,
288 struct dsp, pipeline), args);
289 list_add_tail(&pipeline_entry->list,
290 &pipeline->list);
291 } else {
292 pipeline_entry->p = elem->new(args);
293 if (pipeline_entry->p) {
294 list_add_tail(&pipeline_entry->
295 list, &pipeline->list);
296#ifdef PIPELINE_DEBUG
297 printk(KERN_DEBUG "%s: created "
298 "instance of %s%s%s\n",
299 __func__, name, args ?
300 " with args " : "", args ?
301 args : "");
302#endif
303 } else {
304 printk(KERN_ERR "%s: failed "
305 "to add entry to pipeline: "
306 "%s (new() returned NULL)\n",
307 __func__, elem->name);
308 kfree(pipeline_entry);
309 incomplete = 1;
310 }
311 }
312 found = 1;
313 break;
314 }
315
316 if (found)
317 found = 0;
318 else {
319 printk(KERN_ERR "%s: element not found, skipping: "
320 "%s\n", __func__, name);
321 incomplete = 1;
322 }
323 }
324
325_out:
326 if (!list_empty(&pipeline->list))
327 pipeline->inuse = 1;
328 else
329 pipeline->inuse = 0;
330
331#ifdef PIPELINE_DEBUG
332 printk(KERN_DEBUG "%s: dsp pipeline built%s: %s\n",
333 __func__, incomplete ? " incomplete" : "", cfg);
334#endif
335 kfree(dup);
336 return 0;
337}
338
339void dsp_pipeline_process_tx(struct dsp_pipeline *pipeline, u8 *data, int len)
340{
341 struct dsp_pipeline_entry *entry;
342
343 if (!pipeline)
344 return;
345
346 list_for_each_entry(entry, &pipeline->list, list)
347 if (entry->elem->process_tx)
348 entry->elem->process_tx(entry->p, data, len);
349}
350
351void dsp_pipeline_process_rx(struct dsp_pipeline *pipeline, u8 *data, int len,
352 unsigned int txlen)
353{
354 struct dsp_pipeline_entry *entry;
355
356 if (!pipeline)
357 return;
358
359 list_for_each_entry_reverse(entry, &pipeline->list, list)
360 if (entry->elem->process_rx)
361 entry->elem->process_rx(entry->p, data, len, txlen);
362}