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/list.h>
29 #include <linux/string.h>
30 #include <linux/mISDNif.h>
31 #include <linux/mISDNdsp.h>
32 #include "dsp.h"
33 #include "dsp_hwec.h"
34
35 /* uncomment for debugging */
36 /*#define PIPELINE_DEBUG*/
37
38 struct dsp_pipeline_entry {
39 struct mISDN_dsp_element *elem;
40 void *p;
41 struct list_head list;
42 };
43 struct dsp_element_entry {
44 struct mISDN_dsp_element *elem;
45 struct device dev;
46 struct list_head list;
47 };
48
49 static LIST_HEAD(dsp_elements);
50
51 /* sysfs */
52 static struct class *elements_class;
53
54 static ssize_t
attr_show_args(struct device * dev,struct device_attribute * attr,char * buf)55 attr_show_args(struct device *dev, struct device_attribute *attr, char *buf)
56 {
57 struct mISDN_dsp_element *elem = dev_get_drvdata(dev);
58 ssize_t len = 0;
59 int i = 0;
60
61 *buf = 0;
62 for (; i < elem->num_args; ++i)
63 len = sprintf(buf, "%sName: %s\n%s%s%sDescription: %s\n"
64 "\n", buf,
65 elem->args[i].name,
66 elem->args[i].def ? "Default: " : "",
67 elem->args[i].def ? elem->args[i].def : "",
68 elem->args[i].def ? "\n" : "",
69 elem->args[i].desc);
70
71 return len;
72 }
73
74 static struct device_attribute element_attributes[] = {
75 __ATTR(args, 0444, attr_show_args, NULL),
76 };
77
78 static void
mISDN_dsp_dev_release(struct device * dev)79 mISDN_dsp_dev_release(struct device *dev)
80 {
81 struct dsp_element_entry *entry =
82 container_of(dev, struct dsp_element_entry, dev);
83 list_del(&entry->list);
84 kfree(entry);
85 }
86
mISDN_dsp_element_register(struct mISDN_dsp_element * elem)87 int mISDN_dsp_element_register(struct mISDN_dsp_element *elem)
88 {
89 struct dsp_element_entry *entry;
90 int ret, i;
91
92 if (!elem)
93 return -EINVAL;
94
95 entry = kzalloc(sizeof(struct dsp_element_entry), GFP_ATOMIC);
96 if (!entry)
97 return -ENOMEM;
98
99 entry->elem = elem;
100
101 entry->dev.class = elements_class;
102 entry->dev.release = mISDN_dsp_dev_release;
103 dev_set_drvdata(&entry->dev, elem);
104 dev_set_name(&entry->dev, elem->name);
105 ret = device_register(&entry->dev);
106 if (ret) {
107 printk(KERN_ERR "%s: failed to register %s\n",
108 __func__, elem->name);
109 goto err1;
110 }
111 list_add_tail(&entry->list, &dsp_elements);
112
113 for (i = 0; i < ARRAY_SIZE(element_attributes); ++i) {
114 ret = device_create_file(&entry->dev,
115 &element_attributes[i]);
116 if (ret) {
117 printk(KERN_ERR "%s: failed to create device file\n",
118 __func__);
119 goto err2;
120 }
121 }
122
123 #ifdef PIPELINE_DEBUG
124 printk(KERN_DEBUG "%s: %s registered\n", __func__, elem->name);
125 #endif
126
127 return 0;
128
129 err2:
130 device_unregister(&entry->dev);
131 return ret;
132 err1:
133 kfree(entry);
134 return ret;
135 }
136 EXPORT_SYMBOL(mISDN_dsp_element_register);
137
mISDN_dsp_element_unregister(struct mISDN_dsp_element * elem)138 void mISDN_dsp_element_unregister(struct mISDN_dsp_element *elem)
139 {
140 struct dsp_element_entry *entry, *n;
141
142 if (!elem)
143 return;
144
145 list_for_each_entry_safe(entry, n, &dsp_elements, list)
146 if (entry->elem == elem) {
147 device_unregister(&entry->dev);
148 #ifdef PIPELINE_DEBUG
149 printk(KERN_DEBUG "%s: %s unregistered\n",
150 __func__, elem->name);
151 #endif
152 return;
153 }
154 printk(KERN_ERR "%s: element %s not in list.\n", __func__, elem->name);
155 }
156 EXPORT_SYMBOL(mISDN_dsp_element_unregister);
157
dsp_pipeline_module_init(void)158 int dsp_pipeline_module_init(void)
159 {
160 elements_class = class_create(THIS_MODULE, "dsp_pipeline");
161 if (IS_ERR(elements_class))
162 return PTR_ERR(elements_class);
163
164 #ifdef PIPELINE_DEBUG
165 printk(KERN_DEBUG "%s: dsp pipeline module initialized\n", __func__);
166 #endif
167
168 dsp_hwec_init();
169
170 return 0;
171 }
172
dsp_pipeline_module_exit(void)173 void dsp_pipeline_module_exit(void)
174 {
175 struct dsp_element_entry *entry, *n;
176
177 dsp_hwec_exit();
178
179 class_destroy(elements_class);
180
181 list_for_each_entry_safe(entry, n, &dsp_elements, list) {
182 list_del(&entry->list);
183 printk(KERN_WARNING "%s: element was still registered: %s\n",
184 __func__, entry->elem->name);
185 kfree(entry);
186 }
187
188 #ifdef PIPELINE_DEBUG
189 printk(KERN_DEBUG "%s: dsp pipeline module exited\n", __func__);
190 #endif
191 }
192
dsp_pipeline_init(struct dsp_pipeline * pipeline)193 int dsp_pipeline_init(struct dsp_pipeline *pipeline)
194 {
195 if (!pipeline)
196 return -EINVAL;
197
198 INIT_LIST_HEAD(&pipeline->list);
199
200 #ifdef PIPELINE_DEBUG
201 printk(KERN_DEBUG "%s: dsp pipeline ready\n", __func__);
202 #endif
203
204 return 0;
205 }
206
_dsp_pipeline_destroy(struct dsp_pipeline * pipeline)207 static inline void _dsp_pipeline_destroy(struct dsp_pipeline *pipeline)
208 {
209 struct dsp_pipeline_entry *entry, *n;
210
211 list_for_each_entry_safe(entry, n, &pipeline->list, list) {
212 list_del(&entry->list);
213 if (entry->elem == dsp_hwec)
214 dsp_hwec_disable(container_of(pipeline, struct dsp,
215 pipeline));
216 else
217 entry->elem->free(entry->p);
218 kfree(entry);
219 }
220 }
221
dsp_pipeline_destroy(struct dsp_pipeline * pipeline)222 void dsp_pipeline_destroy(struct dsp_pipeline *pipeline)
223 {
224
225 if (!pipeline)
226 return;
227
228 _dsp_pipeline_destroy(pipeline);
229
230 #ifdef PIPELINE_DEBUG
231 printk(KERN_DEBUG "%s: dsp pipeline destroyed\n", __func__);
232 #endif
233 }
234
dsp_pipeline_build(struct dsp_pipeline * pipeline,const char * cfg)235 int dsp_pipeline_build(struct dsp_pipeline *pipeline, const char *cfg)
236 {
237 int len, incomplete = 0, found = 0;
238 char *dup, *tok, *name, *args;
239 struct dsp_element_entry *entry, *n;
240 struct dsp_pipeline_entry *pipeline_entry;
241 struct mISDN_dsp_element *elem;
242
243 if (!pipeline)
244 return -EINVAL;
245
246 if (!list_empty(&pipeline->list))
247 _dsp_pipeline_destroy(pipeline);
248
249 if (!cfg)
250 return 0;
251
252 len = strlen(cfg);
253 if (!len)
254 return 0;
255
256 dup = kmalloc(len + 1, GFP_ATOMIC);
257 if (!dup)
258 return 0;
259 strcpy(dup, cfg);
260 while ((tok = strsep(&dup, "|"))) {
261 if (!strlen(tok))
262 continue;
263 name = strsep(&tok, "(");
264 args = strsep(&tok, ")");
265 if (args && !*args)
266 args = NULL;
267
268 list_for_each_entry_safe(entry, n, &dsp_elements, list)
269 if (!strcmp(entry->elem->name, name)) {
270 elem = entry->elem;
271
272 pipeline_entry = kmalloc(sizeof(struct
273 dsp_pipeline_entry), GFP_ATOMIC);
274 if (!pipeline_entry) {
275 printk(KERN_ERR "%s: failed to add "
276 "entry to pipeline: %s (out of "
277 "memory)\n", __func__, elem->name);
278 incomplete = 1;
279 goto _out;
280 }
281 pipeline_entry->elem = elem;
282
283 if (elem == dsp_hwec) {
284 /* This is a hack to make the hwec
285 available as a pipeline module */
286 dsp_hwec_enable(container_of(pipeline,
287 struct dsp, pipeline), args);
288 list_add_tail(&pipeline_entry->list,
289 &pipeline->list);
290 } else {
291 pipeline_entry->p = elem->new(args);
292 if (pipeline_entry->p) {
293 list_add_tail(&pipeline_entry->
294 list, &pipeline->list);
295 #ifdef PIPELINE_DEBUG
296 printk(KERN_DEBUG "%s: created "
297 "instance of %s%s%s\n",
298 __func__, name, args ?
299 " with args " : "", args ?
300 args : "");
301 #endif
302 } else {
303 printk(KERN_ERR "%s: failed "
304 "to add entry to pipeline: "
305 "%s (new() returned NULL)\n",
306 __func__, elem->name);
307 kfree(pipeline_entry);
308 incomplete = 1;
309 }
310 }
311 found = 1;
312 break;
313 }
314
315 if (found)
316 found = 0;
317 else {
318 printk(KERN_ERR "%s: element not found, skipping: "
319 "%s\n", __func__, name);
320 incomplete = 1;
321 }
322 }
323
324 _out:
325 if (!list_empty(&pipeline->list))
326 pipeline->inuse = 1;
327 else
328 pipeline->inuse = 0;
329
330 #ifdef PIPELINE_DEBUG
331 printk(KERN_DEBUG "%s: dsp pipeline built%s: %s\n",
332 __func__, incomplete ? " incomplete" : "", cfg);
333 #endif
334 kfree(dup);
335 return 0;
336 }
337
dsp_pipeline_process_tx(struct dsp_pipeline * pipeline,u8 * data,int len)338 void dsp_pipeline_process_tx(struct dsp_pipeline *pipeline, u8 *data, int len)
339 {
340 struct dsp_pipeline_entry *entry;
341
342 if (!pipeline)
343 return;
344
345 list_for_each_entry(entry, &pipeline->list, list)
346 if (entry->elem->process_tx)
347 entry->elem->process_tx(entry->p, data, len);
348 }
349
dsp_pipeline_process_rx(struct dsp_pipeline * pipeline,u8 * data,int len)350 void dsp_pipeline_process_rx(struct dsp_pipeline *pipeline, u8 *data, int len)
351 {
352 struct dsp_pipeline_entry *entry;
353
354 if (!pipeline)
355 return;
356
357 list_for_each_entry_reverse(entry, &pipeline->list, list)
358 if (entry->elem->process_rx)
359 entry->elem->process_rx(entry->p, data, len);
360 }
361
362
363